• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a sealing device (30) intended to be fixed against an edge of a tube and against a column. According to the invention, its body (3060) comprises guides (3030), distributed around its cavity (316) between an inner side (3064) opening into the cavity (316) and an outer side (3062) opening against a ring Concentric clamping device (305) rotatably mounted about the axis (A), fingers (303) integral with external actuating members (3031) being guided in the guides (3030), the ring (305) having zones (3051) for actuation adapted to be positioned against the members (3031) for sliding the projecting fingers (303) into the cavity (316) for clamping the fingers (303) against the edge of the tube when the ring (303) 305) and the base (306) are in a first relative rotational position, the ring (305) and the base (306) being able to pass, by rotation about the axis (A), between the and the other of the first position and a second position, wherein the zones (3051) are spaced from the members (3031) to allow the fingers s (303) to be returned to the body (3060).
    公开号:FR3044068A1
    申请号:FR1561211
    申请日:2015-11-20
    公开日:2017-05-26
    发明作者:Frederic Gaulupeau
    申请人:Electricite de France SA；
    IPC主号:
    专利说明:

    The invention relates to a sealing device intended to be fixed against an end edge of a tube and against a column to pass through the tube, as well as a method for mounting this device.
    One field of the invention relates in particular to thermocouple columns arranged on a tube of a lid of a tank of a pressurized water reactor, such as for example a nuclear reactor of a nuclear power generating plant. these thermocouples must measure by the column entering inside the tank, the temperature in it.
    JP-A-10062583 discloses a sealing device comprising a base having three cams to grip a vertical column of thermocouples, including two fixed cams and a movable cam by rotating a horizontal outer bolt screwed into the base. A disadvantage of this known device is that it performs a clamping of the movable cam against the fixed cams, leading to clamping asymmetries and therefore of application force on the seals, with a risk of jamming. Another disadvantage of this device is that the user must strive to prevent the cams from tilting around the column. Another disadvantage of this device is that the user takes a long time to tighten the bolt in order to grip the column, which is penalizing in environments with high constraints for the personnel, such as for example in a nuclear power plant. electricity, within which personnel may be exposed to ionizing radiation.
    JP-A-10062584 discloses a sealing device comprising a base having three cams to grip a vertical column of thermocouples, including a fixed cam and two cams movable by rotation of two handles attached thereto about two vertical axes attached to the base. A disadvantage of this known device is that it performs a clamping of the moving cams against a fixed cam, leading to clamping asymmetries and therefore of application force on the seals, with a risk of jamming. Another disadvantage of this device is that the user must strive to prevent the cams from tilting around the column. Another disadvantage of this device is that the user must exert a significant force several times to rotate each of the handles, which is detrimental in environments with high constraints for staff, such as for example in a nuclear power plant. electricity, within which personnel may be exposed to ionizing radiation.
    JP-A-10048383 discloses a sealing device comprising a base having cams to grip a vertical column of thermocouples, these cams being movable by rotation of two handles attached thereto about two horizontal axes fixed to the base. This device has disadvantages similar to those indicated above for the device known from JP-A-10062584. The invention aims to obtain a sealing device and a method for its assembly, which overcomes the drawbacks of the state of the art. For this purpose, a first object of the invention is a sealing device intended to be fixed against an end edge of a tube and against a column to pass through an axis of the column an opening of the tube, delimited by this edge, the device comprising a base having a passage for the axial passage of the column, a first seal member adapted to be activated to be pressed against the column in the bushing, a body surrounding the axis a cavity for receiving the edge of the tube and a second sealing member intended to be pressed against the edge of the tube in the cavity, the passageway communicating axially with the cavity, characterized in that the body comprises a plurality of guides, which are distributed around the cavity and which extend between an inner side opening into the cavity and an outer side opening against a concentric clamping ring, rotatably mounted around of the axis relative to the base, a plurality of inner fingers integral with a plurality of external actuating members being respectively guided in the plurality of guides around the cavity, the ring comprising a plurality of zones of actuating remote from each other and able to be positioned against respectively the plurality of external actuating members for sliding the projecting fingers in the cavity for clamping the fingers against the edge of the tube when the ring and the base are the one relative to the other in a first relative rotational position, said first clamping position of the edge of the tube, the ring and the base being adapted to pass, by rotation relative to each other around the axis, between one and the other of the first relative rotational position and a second relative rotational position, said loosening of the edge of the tube, wherein the plurality actuating areas are spaced apart from the plurality of external actuating members to allow the fingers to be retracted into the body.
    Thanks to the invention, one gains in reliability of clamping and in time of intervention of the personnel to implement the fixing of the device, which is particularly advantageous in the mediums with strong constraints for the personnel, such as for example in a nuclear power generation plant, within which personnel may be exposed to ionizing radiation. The invention thus allows a single manipulation of rotation of the second to the first position to clamp in a uniform manner and almost simultaneously all fingers against the tube, avoiding jamming or mispositioning.
    According to one embodiment of the invention, the plurality of guides extends radially relative to the axis for the radial guidance of the fingers relative to the axis.
    According to one embodiment of the invention, the base and / or the body is secured to at least a first handle, while the ring is secured to at least a second handle.
    According to one embodiment of the invention, the base comprises a locking lock of the ring and the body in their first relative rotational position, the lock being connected to a manual actuating means for unlocking the lock to allow the passage from the first rotational position relative to the second relative rotational position.
    According to one embodiment of the invention, the plurality of actuation zones respectively comprises a plurality of parts of the inner surface of the ring, separated from one another about the axis by a plurality of recesses of this inner surface, which are further from the axis than its parts and which serve for receiving respectively the plurality of external actuating members in the second relative rotational position.
    According to one embodiment of the invention, each recess has a first slope, starting from the part of the inner surface of the ring and moving away from the axis to a bottom of the recess, for guiding the outer actuating member between one and the other of a first position retracted into the guide in the first relative rotational position and a second projecting position in the bottom in the second relative rotational position.
    According to one embodiment of the invention, each external actuating member comprises a cam having a second slope facing the ring and rising in the same direction as the first slope.
    According to one embodiment of the invention, each guide comprises a constraint element for constraining the external actuating member to move towards the ring.
    According to one embodiment of the invention, the first sealing member comprises a first dynamic seal, adjacent to the penetration and adapted to be activated by inflation by injecting a fluid via an end of the base to press a part of the first seal against the column in the bushing.
    According to one embodiment of the invention, the sealing device comprises movement transmission means for pressing the second sealing member against the edge of the tube, when the ring and the base pass from the second rotational position. relative and the first relative rotational position.
    According to one embodiment of the invention, the second sealing member comprises a second seal rotated in a first direction of the axis towards a first surface of the edge of the tube, the motion transmission means comprise on each finger a second bearing surface against a second surface of the edge, which is axially distant from the first surface, this second bearing surface rising in a second direction opposite to the first direction from the inside to the outside, for pressing the second seal towards the first surface, as the finger slides in the cavity from the outside inwards to the first clamping position of the edge.
    According to one embodiment of the invention, at least three fingers, of which at least two are positioned in a first angular sector of 180 ° about the axis and at least one other is positioned in a second angular sector of 180 ° complementary of the first sector in the first clamping position of the edge of the tube, are provided.
    According to one embodiment of the invention, the sealing device comprises means for removable attachment of at least one plug to plug the crossing in the absence of a column in the latter.
    A second object of the invention is a method of mounting the sealing device as described above against an end edge of a tube and against a column to pass through an axis of the column an opening of the tube, delimited by this edge, the sealing device comprising movement transmission means for pressing the second sealing member against the edge of the tube, when the ring and the base pass from the second relative rotational position and to the first relative rotational clamping position against the edge of the tube, wherein the ring and the base are rotated relative to each other about the axis of the second relative rotational position and at the first position relative rotation, to clamp the base against the edge (281) of the tube and to press the second sealing member against the edge of the tube, then the first sealing member is activated to press it against the column in the crossing. The invention will be better understood on reading the following description, given solely by way of nonlimiting example with reference to the accompanying drawings, in which: FIG. 1 schematically represents a nuclear power plant, in which can be set FIG. 2 is a diagrammatic cross-sectional view of a tank of a nuclear power plant reactor according to FIG. 1, on which it is possible to implement the sealing device and its mounting method according to the invention; the sealing device according to the invention, - Figure 3 is a schematic perspective view from above of the sealing device according to one embodiment of the invention, - Figure 4 is a schematic perspective view from below of sealing device according to one embodiment of the invention, - Figure 5 is a schematic axial sectional view of the sealing device according to an embodiment of the invention. FIG. 6 is a diagrammatic bottom view of the sealing device according to the invention in a first clamping position of the tube; FIG. 7 is a schematic bottom view of the sealing device according to one embodiment; of the invention in a second loosening position of the tube, - Figure 8 is a schematic perspective view from above of the sealing device according to one embodiment of the invention, wherein its opening is blocked by a plate. - Figure 9 shows schematically in vertical section an example of a flange on which can be fixed the sealing device according to the invention.
    First described below, with reference to Figures 1 and 2 a context to which can be applied the sealing device according to the invention and the method for its assembly according to the invention. Of course, the invention can be applied to different contexts.
    Figure 1 shows a nuclear power plant. The thermal energy is produced by its nuclear reactor (6) formed of fissile fuel (2) cooled by water (16), all placed in the tank (1). Figure 2 shows a fissile fuel element (5). The hot water (7) produced travels through a steam generator (8) by hundreds of very inverted U-shaped pins (9) of very great height (H) relative to the reactor, in particular with respect to the joint plane (10). ) of the tank (1) on which the cover (3) rests. The heat of the pins will carry the water of a secondary circuit (11) to the state of vapor (13) which will drive turbines (14) themselves driving generating generators (15) producing electricity.
    The tube (28) is welded to the lid (3). Inside the tube (28) passes a column (27) of thermocouple through the cover (3) inside the tube (28).
    In operation, it is important to control the power of the reactor (6) by monitoring in particular the temperature of the fuel assemblies (5) of the core (2) and more precisely the temperature of the water (16) which cools it. For this purpose, an internal instrumentation (17), said upper, above the heart as shown in Figure 2, allows the control of the power and the measurement of the temperature by thermocouples (26) moving in the upper heart . These thermocouples (26) are guided in columns (27), which pass through the cover (3) and which are held by tubes (28), which pass through the cover (3), which are welded to the latter partially emerging external of the latter, that is to say in the enclosure (18) of the reactor building. The water of the reactor being under pressure at 155 bar, it is essential that in operation the sealing between the columns (27) and the tubes (28) is ensured, certain sealing systems, hereinafter referred to as dedicated systems of sealing, and not shown being previously mounted for this purpose on the columns (27) and the tubes (28) to seal between them during operation of the reactor. On stopping the reactor, the cover (3) is removed, which mechanically imposes the withdrawal of these dedicated sealing systems between the columns (27) and tubes (28).
    However, a particular maintenance operation called Vacuuming the primary circuit for its filling water, requires temporarily replace the lid (3) on the tank (1). As in this case the column (27) thermocouples has been stripped of its dedicated sealing systems, the sealing function must again be ensured. Sealing must again be ensured between the column (27) and the tube (28) or the flange (40). At shutdown of the reactor, for the Vacuuming, the pressure of the core is at atmospheric pressure compared to 155 bars in operation and the sealing function is generally provided by another sealing device, and not by the dedicated systems. sealing. In fact the parts of the dedicated sealing systems are sensitive to handling and require additional dosimetry. But this temporary solution is not satisfactory. It leads to globally penalizing operations; first of all in terms of duration and therefore cost and consequently unnecessarily increases the individual and collective dosimetry of personnel, while remaining within the limits allowed for work exposed to radiation.
    One of the problems solved by the present invention is to improve this situation during the vacuum test of the primary circuit of a nuclear power plant, implementing the lid (3) of the tank. The sealing device according to the invention makes it possible to ensure the sealing function of the thermocouple columns when carrying out the vacuum extraction tests (MSV) of the primary circuit, discharged core, of a nuclear power station. The solution is applicable when the use of the real cover (that is to say the cover (3) used during the operation of the reactor) for the evacuation is unavoidable for various reasons, for example non availability of a false -cover in another embodiment of the vacuum. The invention improves and makes reliable the tightness achieved around the thermocouple columns (27) and simplifies the laying method by eliminating human interventions at the bottom of the pool, close to the tank lid, and costly integrated collective dosimetry.
    The principles of the vacuum procedure (hereafter referred to as MSV) and the sealing function of the thermocouple columns (27), in operation and in the situation of the primary circuit filling test, are recalled below. Vacuuming according to the prior art.
    Once the reactor is shut down, the lid (3) is removed from the tank (1) and is deposited. The fuel (5) is discharged.
    Before recharging the new core, it is necessary to fill the primary circuit and leave no volume of air. When filling a reactor loop, at atmospheric pressure, the hydrostatic equilibrium of the water levels does not allow the height of the vessel joint plane (10) to be exceeded, because of the height (H) that separates the tank joint plane (10) and the top (19) of the pins (9).
    To complete the filling and fill in water the upper part of the pins, so by chasing the air that is trapped there, a vacuum removal operation (MSV) is performed.
    The document FR-A-2 921 510 describes in detail this process implemented on a false cover. This method is applicable to the 'real lid' (3).
    The Vacuum Removal (MSV) process comprises the following steps.
    After shutdown of the reactor and return to the pressure at atmospheric pressure of the primary circuit, - the cover (3) is removed, the dedicated sealing system of the devices (27, 28) is replaced according to the prior art practice by caps protecting the female flanges (40). - The core is unloaded, the primary circuit is drained for slice stop maintenance. - End of maintenances, the primary circuit must be filled. - Place the lid (3), placing it on a silicone seal on the vessel joint plane (10) which seals the primary circuit at atmospheric pressure, a temporary sealing system is placed around the columns (27) thermocouples and evacuated in the primary circuit, about 300 mb; this depressurization increases the seal at the silicone seal. - The primary circuit is filled to the top of the pins, however leaving pockets of air present (filling step). - Vents are then opened to break the vacuum which circulates the water up the pins, the water level in the tank drops. The pressure returns to Atmospheric pressure. - The water is partially drained to the tank joint plane (10), the temporary sealing system is removed, and the protective caps are replaced. The tank joint plane is near the bottom level of the pool. - The lid (3) is removed; the filling of the tank continues. - The heart is loaded. - The lid (3) is replaced and bolted to the tank. - The protective caps are removed and the normal seals used for operation are replaced.
    These steps of the MSV require sealing of the thermocouple columns. As shown in Figure 2, the water filling step leads to fill the entire tank (1) and its lid (3) of water; said water being able to infiltrate into the bushings from which the tubes (28) welded to the lid (3) emerge. When installing or removing the lid (3), the column (27) slides in some way inside the tube (28), and this after removing all other devices providing sealing, arranged in the upper part.
    The sealing device according to the invention is described below with reference to FIGS. 3 to 8.
    The sealing device according to the invention is intended to be fixed against an end edge 281 of a tube 28 and against a column 27. The column 27 must pass through an axis A of the column 27 an opening 285 of the tube 28, this opening 285 being delimited by this edge 281. The column 27 has for example a cylindrical outer surface, in particular circular cylindrical about the axis A. The column 27 can be any column used to pass, from the edge 281 end of the tube 28, an instrumentation for measuring one or more parameters in the space at the other end of the tube 28 (inside the tank 1 in the application example mentioned above), as for example one or more temperatures, for example by one or more thermocouples, or other parameters.
    The sealing device 30 comprises a base 306 having a penetration 3061 for the passage of the column 27 along the axis A. The sealing device 30 further comprises a first sealing member 310 for sealing against the column 27 in the bushing 3061. According to one embodiment, the first sealing member 310 is able to be activated to be pressed against the column 27 in the bushing 3061. When the first sealing member 310 is not activated the column 27 can slide along the axis A in the bushing 3061.
    The sealing device 30 further comprises a body 3060, which surrounds around the axis A a cavity 316 for receiving the edge 281 of the tube 28. The sealing device 30 further comprises a second sealing member 304 intended to be pressed against the edge 281 of the tube 28 in the cavity 316. The bushing 3061 communicates, in a direction parallel to the axis A, with the cavity 316. The bushing 3061 has a transverse dimension (for example transverse diameter) which is smaller than the transverse dimension (for example transverse diameter) of the cavity 316, the transverse direction being taken with respect to the axis A traversing this transverse direction, which is for example perpendicular to the axis A.
    According to the invention, the body 3060 comprises a ring 305 rotatably mounted around the body 3060, this ring 305 serving to concentrically tighten a plurality of fingers 303 guided in guides 3030 against the edge 281 of the tube 28. The body 3060 has a plurality of guides 3030, which are distributed around the cavity 316 and which extend between an inner side 3064 of the body 3060, opening into the cavity 316 and an outer side 3062 opening against the ring 305. The ring 305 is rotatably mounted about the axis A relative to the base 306. The ring 305 surrounds the body 3060 and is located outside of the body 3060. The ring 305 is for example ring-shaped. The ring 305 is for example rotatably mounted in a peripheral groove 3066 of the body 3060 delimited by an upper wall 3067a and a bottom wall 3067b, spaced apart from one another along the axis A. The ring 305 may for example be made in the form of two half-rings around the axis A.
    In what follows, the direction going from the outside to the inside is a direction approaching the axis A or the column 27 or the cavity 316.
    A plurality of inner fingers 303 are provided, which are respectively integral with a plurality of external actuating members 3031. The plurality of external actuating members 3031 are respectively guided in the plurality of guides 3030 around the cavity 316. The ring 305 comprises a plurality of zones 3051 of operation distant from each other and able to be positioned against, respectively, the plurality of external actuating members 3031 for sliding the projecting fingers 303 into the cavity 316 for clamping the fingers 303 against the edge 281 of the tube 28, when the ring 305 and the base 306 are one relative to the other in a first relative rotational position, said first clamping position of the edge 281 of the tube 28, shown in Figure 6.
    The ring 305 and the base 306 are able to pass, by rotation relative to each other about the axis A, between one and the other of the first relative rotational position and a second relative rotational position, said loosening of the edge 281 of the tube 28. In this second relative rotational position, shown in Figure 7, the plurality of actuating zones 3051 is spaced from the plurality of outer members 3031 of actuation to allow the fingers 303 to be retracted into the body 3060. It is in this second loosening position that the sealing device can be threaded around or removed from the column 27 and the edge 281.
    Thus, the ring 305 is a ring 305 concentric clamping fingers against the edge 281 of the tube 28. The ring 305 thus ensures a uniform distribution of the clamping force around the tube 28, performing a single rotation action around the column 27. The invention thus saves handling time and installation time of the sealing device 30, as well as reliability of the clamping and reliability of the seal.
    The body 3060 may for example be of generally annular shape about the axis A and the cavity 316. The base 306 comprises for example an upper portion 3063 delimiting the bushing 3061 and connected or fixed or in one piece with the 3060. The upper portion 3063 may for example be annular around the axis A and around the bushing 3061. The upper portion 3063 may be formed for example by a first plate surmounting and attached to a second plate forming the body 3060, these plates extending transversely and for example perpendicular to the axis A.
    In the embodiment shown in the figures, the inner side 3064 of the body 3060 is cylindrical about the axis A, for example circular cylindrical about the axis A. The outer side 3062 of the body 3060 is for example cylindrical around the A axis, for example cylindrical circular around the axis A. The ring 305 is for example cylindrical about the axis A, for example circular cylindrical about the axis A.
    The guides 3030 are arranged to guide their respective finger 303 from the outside towards the inside with respect to the axis A, that is to say to bring the fingers 303 closer to, for example, this axis A. , and in the opposite direction. In the embodiment shown in FIGS. 6 and 7, the guides 303 are rectilinear. Of course, in other embodiments not shown, the guides 303 could be curved. According to the embodiment shown in FIGS. 6 and 7, the plurality of guides 3030 extends radially with respect to the axis A for the radial guidance of the fingers 303 with respect to the axis A. Of course, the guides 3030 can do not extend radially with respect to the axis A and may extend obliquely.
    According to the embodiment of Figure 4, it can be provided under the lower part of the body 3060, that is to say under its remote part of the members 310, 304 sealing along the axis A, a ring 3065 delimiting the guides 3030 and allowing, when the ring 3037 is disassembled, to insert in the guides 3030 the fingers 303, the actuating members 3031 and the parts attached thereto. The ring 3065 can be fixed to the body 3030 by removable fixing means, for example by bolts 3038 or by non-removable fixing means, for example by rivets 3038. FIGS. 6 and 7 are shown without showing the wall lower 3067b and part 3065, to show the elements present in the guides 3030.
    According to one embodiment, the base 306 and / or the body 3060 is secured to at least one first handle 314, while the ring 305 is integral with at least one second handle 301. Thus, the handles 301 and 314 allow the user to rotate the ring 305 and the base 306 relative to each other about the axis A to pass the fingers 303 between the one and the other of the first position of tightening at the second loosening position. For example, the handle 301 is attached to the ring 305 through an outer arm 3010.
    According to one embodiment, the base 306 comprises a lock 307 for locking the ring 305 and the body 3060 in their first relative rotational position. The lock 307 is connected to a means 3070 for manual actuation, for example in the form of a cylindrical button surmounting the lock 307, this means 3070 for unlocking the lock 307 to allow the passage of the first rotational position relative to the second position relative rotation. Thus, the lock 307 makes it possible to block the fingers 303 in the first clamping position of the edge 281 of the tube 28. The lock 307 comprises, for example, a first locking portion 3071 able to fit into a recess 3072 of the ring 305 or to an outer arm 3010 attached thereto, for locking this ring 305 in the first clamping position. The manual actuating means 3070 is provided for lifting the first portion 3071 of the latch and removing it from the recess 3072 to unlock the latch 307. Prestressing means may be provided on the first portion 3071 of the latch to constrain it to the latch. 305 ring or to the arm 3010, so that this portion 3071 is automatically engaged in the hollow 3072 in the first clamping position.
    According to one embodiment, the plurality of actuating zones 3051 respectively comprises a plurality of first portions 3052 of the inner surface 3053 of the ring 305. These portions 3052 of the inner surface 3053 of the ring 305 are separated from each other by a plurality of recesses 3054 of this inner surface 3053. These recesses 3054 are further away from the axis A than the first portions 3052 of the inner surface 3053 of the ring 305 and serve for receiving respectively the plurality of outer members 3031 actuating in the second relative rotational position, that is to say in the loosening position.
    According to one embodiment, each recess 3054 has a first slope, which starts from the first part 3052 adjacent and moves away from the axis A to a bottom 3055, to guide the external actuating member 3031 between both of a first position retracted into the guide 3030 in the first relative rotational position, that is to say of clamping, and a second projecting position in the bottom 3055 of the recess 3054 in the second position of relative rotation, that is to say in the second position of loosening. Thus, when the ring 305 is rotated in a first direction S1 of clamping rotation about the axis A relative to the body 3060 or to the base 306, that is to say from the second position to the first position, each actuating member 3031 slides against the second portion 3056 of the inner surface 3053 delimiting the recess 3054, from the bottom 3055 to the first portion 3052, which forces the actuating member 3031, and therefore the finger 303 attached thereto, to slide in the guide 3030 from the outside inwards to get closer to the axis A and thus to make the finger 303 move from the inside 3064 to the cavity 316. When the ring 305 is rotated relative to the body 3060 or to the base 306 in a direction S2 of loosening rotation, opposite the first direction S1 about the axis A, each actuating member 3031 is made free of slide outward in the guide 3030 against the second portion 3056 of the surface 3 053 delimiting the recess 3054, to move from the first portion 3052 to the bottom 3055 and slide the finger 303 from the inside out until the finger 303 no longer protrudes from the inner side 3064 and does not protruding into the cavity 316 in the second loosening position.
    According to one embodiment, each external actuating member 3031 comprises a cam 3032 having a second slope facing the ring 305 and rising in the same direction as the first slope. Thus, the cam 3032 can slide along the first slope of the second portion 3056 defining the recess 3054. Of course, the first slope may not be identical to the second slope, as is shown in Figures 6 and 7 .
    According to one embodiment, each guide 3030 comprises a constraint element 3033 for constraining the external actuating member 3031 to move towards the ring 305, that is to say from the inside to the outside. This constraint element 3033 is therefore intended to constrain the finger 303 to move from the cavity 316 outwards, that is to say to retract the finger 303 into the body 3030. This constraint element 3033 can be formed by one or more spring (s). For example, the outer actuating member 3031 is attached to its respective finger 303 via a rod 3034. The constraining member 3033 may be provided between a stop member 3035 attached to the body 3060 in the guide. 3030 and the outer actuating member 3031, for example comprising a compression spring between the stop member 3035 and the member 3031. Alternatively, the constraint member 3033 may be provided between a fixed stop piece 3035. to the body 3060 in the guide 3030 and the finger 303, for example by including a tension spring between the abutment member 3035 and the finger 303. Thus, the actuating member 3031 is pressed by the element 3033 of constraint against the inner surface 3053 of the ring 305, namely against its first portion 3052 closer to the axis A in the first clamping position, against the second portion 3056 during the passage from the first clamping position to the second position of loosening and against the bottom 3055 of the recess 3054 in the second loosening position.
    According to one embodiment, the first sealing member 310 comprises a first dynamic seal 300, which is adjacent to the penetration 3061 and which is able to be activated by inflation by injecting a fluid via an end 302 of the base 306 for pressing a portion 311 of the first seal 300 against the column 27 in the bushing 3061. This dynamic seal 300 is for example annular in the bushing to surround the column 27 around Tax A. The end 302 communicates via internal recesses 312 with the first seal 300, to allow fluid to be sent into this seal 300 from the end 302. The end 302 is adapted to be connected to an external pipe for sending fluid. The injection of the fluid via the end 302 from the outer pipe fills the dynamic seal 300 and deforms it to cause a displacement of its portion 311 in the centripetal direction, that is to say towards the column 27, so that the part 311 of the seal 300 bears against the column 27 to ensure around it a sealing barrier.
    According to one embodiment, the sealing device 30 comprises motion transmission means 3036 for pressing the second sealing member 304 against the edge 281 of the tube 28, when the ring 305 and the base 306 pass from the second rotational position relative to the first relative rotational position, that is to say to clamp the edge 281 of the tube 28.
    According to one embodiment, the second sealing member 304 comprises a second seal 3040, which is rotated in a first direction A1 of the axis A towards a first surface 282 of the edge 281 of the tube 28, this surface 282 being transverse to axis A and in particular perpendicular to axis A. The movement transmission means 3036 comprise a second bearing surface 3037 located on each finger 303. The second bearing surface 3037 of each finger 303 serves to press against a second surface 284 of the edge 281, the surface 284 being for example parallel to the surface 3037. This second surface 284 is remote from the first surface 282 along the axis A. This second bearing surface 3037 rises as it approaches the first surface 282 away from the axis A. This second bearing surface 3037 mounts in a second direction A2 of the axis A (reverse of the first direction A1) going from the inside to the outside, to press the d said second seal 304 to the first surface 282, when the finger 303 slides in the cavity 316 from the outside inwards to the first clamping position of the edge 281. The second surface 3037 of support rises for example in the same direction as the surface 284 which is for example a rear surface 284 of flange 281 edge, axially remote from the first surface 282. Thus, the movement of the outside towards the inside of the finger 303 to arrive in the first position of With the aid of the support surface 3037, the clamping causes the second seal 3040 to move in the first direction A1 to the first surface 282 of the edge 281. In addition, the edge 281 has a lateral outer surface 283 which is for example parallel to the axis A and which is connected on the one hand to the surface 282 and on the other hand to the surface 284. The finger 303 comprises for example another surface 3037b further from the axis A than its surface 3037 and p Arallel to the axis A, for bearing against the lateral outer surface 283.
    According to one embodiment, at least three fingers 303 are provided as fingers 303, at least two of which 303a, 303b are positioned in a first SEC1 angular sector 180 ° about the axis A and at least one other 303c is positioned in a SEC2 second angular sector of 180 degrees complementary SEC1 first sector in the first clamping position of the edge 281 of the tube 28, as shown in Figure 6. It may be for example provided three fingers 303. Of course it can also be provided four fingers 303 or a larger number of fingers 303.
    According to one embodiment, fingers 303 are equiangularly distributed about the axis A in the first clamping position. Thus, in the case of three fingers 303, these can be regularly distributed at 120 degrees from one another about the axis A. In the case of four fingers 303, these can be regularly distributed to 90 degrees from each other around the axis A.
    The sealing device 30 can be used with or without EIS (lower internal equipment), that is to say with or without column 27. In one embodiment in FIG. 8, in the case of use without EIS , that is, without the column 27, but where the sealing device 30 must be clamped around the edge 281 of the tube 28, one or more plug 3068 can be put in place and fixed to the base 306 to plug the bushing 3061, as shown in Figure 8. The plug 3068 is attached to the upper portion 3063, for example by removable fastening means 3069, which may be of the bolting type or the like. The invention also relates to a method of mounting the sealing device described above against an end edge 281 of a tube 28 and against a column 27 to pass through the axis A of the column 27 an opening 285. of the tube 28, delimited by this edge 281, the sealing device 30 comprising the movement transmission means 3036 described above.
    According to this method, during a first step, the ring 305 and the base 306 are rotated relative to each other about the axis A of the second rotational position relative to the first position of relative rotation (i.e. in the first clamping direction SI), for clamping the base 306 against the edge 281 of the tube 28 and for pressing the second sealing member 304 against the edge 281 of the tube 28.
    Then, during a second step, the first sealing member 310 is activated to press it against the column 27 in the bushing 3061.
    The sealing device according to the invention and the method of mounting thereof according to the invention can be used to be fixed around and seal on the edge 281 of a tube 28 fixed to the cover 3 of a tank 1 of a nuclear reactor, as shown in Figures 1 and 2 and as described above, and the thermocouple column 27 of this vessel 1.
    In the foregoing, the edge 281 to which the sealing device according to the invention is to be attached may be a flange 40, itself welded to the tube 28, itself welded to the lid 3, the flange 40 and the tube 28 being traversed by the column 27, as shown in Figure 9, the flange 40 having the parts 281, 282, 283, 284 and 285 described above. The tube 28 may be an adapter tube 28, adapted to allow the sealed outlet of a column 27 in which there are moving probes 26 having a thermocouple function.
    Thus, the procedure for evacuating this reactor 1 tank using the sealing device according to the invention can be as follows.
    At the time of removal of the dedicated sealing systems, while the lid 3 is still on the tank 1 after stopping the wafer, is placed the sealing device 30 and is locked at the edge 281 of the tube 28 in the first clamping position, by rotation of the base 306 and the ring 306 in the first direction SI with respect to one another.
    Then, the lid 3 is removed from the vessel 1 and this lid 3 is removed.
    In another embodiment, these first two steps can be confused; laying and locking can be done once the lid is removed.
    The nozzle is then provided with a pressure fluid line at the end 302 of the device 30.
    Then, the lid 3 is put back on the joint plane 10 of the tank 1 to begin the Vacuuming operation, the device 30 being equipped with its fluid injection pipe under pressure.
    Then, from a remote console, a pressurizing action of the pipe is controlled to inflate the dynamic seal 300 and seal around the column 27.
    Then, a rest period is offered to observe any drift of the pressure, which would be a sign of leakage or malfunction of the dynamic seal 300.
    Then, the procedure of MSV and filling the primary circuit, as described above, is implemented. At the end of this procedure of MSV and filling the primary circuit, the vacuum in the primary circuit being broken and given the return to atmospheric pressure, it operates at a distance to loosen the dynamic seal 300 by releasing the compression fluid.
    Then, in order to guarantee a complete release of the column 27, a slight depression is caused on the dynamic seal 300.
    Then, the lid 3 comprising the device 30 installed on it is deposited, and the loading of the heart can begin.
    Then, the injection line is removed from the end 302.
    Then, the sealing device 30 is unlatched with respect to the edge 281 of the tube 28 in the second unclamping position, by rotation of the base 306 and the ring 306 in the second direction S2 with respect to the other. The device 30 is then removed from the tube 28 and the column 27.
    The cover, uncovered device 30, can then be raised on the joint plane 10 of the vessel 1.
    The present invention contributes to improving the current situation, in particular it reduces to less than one minute the exposure time dosing to ionizing radiation. It saves time on the critical path by operating in masked time. It alleviates the surrounding systems, by dispensing with the scaffolding that was usually provided in the state of the art at the bottom of the pool around the tank 1, and thereby reduces the costs for the operator. The main application of the present invention is to provide a seal around the thermocouple columns 27 passing through the tank cover 1 in order to evacuate the primary circuit following the filling of the pins, in the context described below. above with reference to Figures 1 and 2.
    A secondary use of the invention is to use the sealing device as a seal span protection. Indeed, these ranges of joints are very sensitive and their possible repairs are very delicate. The invention makes it possible to reduce the exposure time of the personnel to ionizing radiation, in particular by reducing the overall time spent at the bottom of the pool (scaffolders, tank operators) and a gain of approximately 3.5 mSv / Vacuuming (estimated values). The invention makes it possible to reduce the intervention time of the personnel, in particular by making the sealing around the columns 27 reliable and secure, installing the tooling in masked time, gaining approximately 3 hours 45 minutes . The invention makes it possible to improve safety, in particular by eliminating the need for access to the lid 3 by the scaffolds of the pool floor which gave rise to the risk of falls, and the erection of the scaffolding being eliminated (manual handling).
    权利要求:
    Claims (14)
    [1" id="c-fr-0001]
    1. Sealing device (30) intended to be fixed against an end edge (281) of a tube (28) and against a column (27) to pass along an axis (A) of the column (27) an opening (285) of the tube (28) delimited by this edge (281), the device comprising a base (306) having a passage (3061) for the axial passage of the column (27), a first member (310) sealing member adapted to be activated to be pressed against the column (27) in the bushing (3061), a body (3060) surrounding a cavity (316) around the axis (A) to receive the edge (281) of the tube (28) and a second sealing member (304) for pressing against the rim (281) of the tube (28) in the cavity (316), the passage (3061) communicating axially with the cavity (316), characterized in that the body (3060) has a plurality of guides (3030), which are distributed around the cavity (316) and which extend between an inside (3064) end hant in the cavity (316) and an outer side (3062) opening against a concentric clamping ring (305) rotatably mounted about the axis (A) relative to the base (306), a plurality of inner fingers (303) integral with a plurality of external actuating members (3031) being respectively guided in the plurality of guides (3030) around the cavity (316), the ring (305) having a plurality of zones (3051) actuators remote from each other and adapted to be positioned against respectively the plurality of external actuating members (3031) for sliding the projecting fingers (303) into the cavity (316) for clamping the fingers (303) against the edge (281) of the tube (28) when the ring (305) and the base (306) are relative to one another in a first relative rotational position, said first edge clamping position (281) ) of the tube (28), the ring (305) and the base (306) being adapted to passing, by rotation relative to each other about the axis (A), between one and the other of the first relative rotational position and a second relative rotational position, said loosening of the edge (281) of the tube (28), wherein the plurality of actuating zones (3051) are spaced from the plurality of external actuating members (3031) to allow the fingers (303) to be retracted into the body (3060).
    [2" id="c-fr-0002]
    2. Sealing device according to claim 1, characterized in that the plurality of guides (3030) extends radially relative to the axis (A) for the radial guide of the fingers (303) relative to the axis (AT).
    [3" id="c-fr-0003]
    3. Sealing device according to any one of the preceding claims, characterized in that the base (306) and / or the body (3060) is integral with at least one first handle (314), while the ring (305) is integral with at least one second handle (301).
    [4" id="c-fr-0004]
    4. Sealing device according to any one of the preceding claims, characterized in that the base (306) comprises a latch (307) for locking the ring (305) and the body (3060) in their first position. relative rotation, the latch (307) being connected to a manual actuating means (3070) for unlocking the latch (307) to allow passage of the first rotational position relative to the second relative rotational position.
    [5" id="c-fr-0005]
    Sealing device according to one of the preceding claims, characterized in that the plurality of actuating zones (3051) respectively comprise a plurality of portions (3052) of the inner surface (3053) of the ring (305). ), separated from each other about the axis (A) by a plurality of recesses (3054) of this inner surface (3053), which are further from the axis (A) than its parts (3052) and which serve receiving respectively the plurality of external actuating members (3031) in the second relative rotational position.
    [6" id="c-fr-0006]
    6. Sealing device according to the preceding claim, characterized in that each recess (3054) has a first slope, starting from the portion (3052) of the inner surface (3053) of the ring (305) and away from the axis (A) to a bottom (3055) of the recess (3054) for guiding the external actuating member (3031) between one and the other of a first retracted position in the guide (3030) in the first relative rotational position and a second projecting position in the bottom (3055) in the second relative rotational position.
    [7" id="c-fr-0007]
    7. Sealing device according to the preceding claim, characterized in that each outer actuating member (3031) comprises a cam (3032) having a second slope facing the ring (305) and rising in the same direction as the first slope.
    [8" id="c-fr-0008]
    8. Sealing device according to any one of the preceding claims, characterized in that each guide (3030) comprises a constraint element (3033) for constraining the external actuating member (3031) to move towards the ring (305).
    [9" id="c-fr-0009]
    9. Sealing device according to any one of the preceding claims, characterized in that the first member (310) sealing comprises a first dynamic seal (300), adjacent the passage (3061) and adapted to be activated by inflation by injecting a fluid through an end (302) of the base (306) to press a portion (311) of the first seal (300) against the column (27) in the bushing (3061).
    [10" id="c-fr-0010]
    10. Sealing device according to any one of the preceding claims, characterized in that it comprises movement transmission means for pressing the second member (304) sealing against the edge (281) of the tube (28). when the ring (305) and the base (306) move from the second relative rotational position to the first relative rotational position.
    [11" id="c-fr-0011]
    11. Sealing device according to the preceding claim, characterized in that the second sealing member (304) comprises a second seal (3040) sealing in a first direction (Al) of the axis (A) to a first surface (282) of the edge (281) of the tube (28), the means (3036) for transmitting motion comprise on each finger (303) a second surface (3037) bearing against a second surface (284) of the edge (281), which is axially remote from the first surface (282), this second bearing surface (3037) rising in a second direction (A2) inverse of the first direction (Al) going from the inside to the outside, for pressing the second seal (304) toward the first surface (282), when the finger (303) slides in the cavity (316) from the outside inwards to the first edge clamping position ( 281).
    [12" id="c-fr-0012]
    12. Sealing device according to any one of the preceding claims, characterized in that at least three fingers, of which at least two (303a, 303b) are positioned in a first angular sector (SEC1) of 180 ° around the axis (A) and at least one other (303c) is positioned in a second angle sector (SEC2) of 180 ° complementary to the first sector (SEC1) in the first clamping position of the edge (281) of the tube (28) , are provided.
    [13" id="c-fr-0013]
    13. Sealing device according to any one of the preceding claims, characterized in that it comprises means (3039) for removable attachment of at least one plug (3068) to plug the bushing (3061) in the absence column (27) in the latter.
    [14" id="c-fr-0014]
    14. A method of mounting the sealing device according to any one of the preceding claims against an end edge (281) of a tube (28) and against a column (27) to pass through an axis (A) of the column (27) an opening (285) of the tube (28) delimited by this edge (281), the sealing device comprising means (3036) for transmitting motion to press the second member (304) sealing against the edge (281) of the tube (28), when the ring (305) and the base (306) pass from the second relative rotational position and the first relative rotational position of clamping against the edge (281) of the tube (28), in which the ring (305) and the base (306) are rotated relative to one another about the axis (A) of the second relative rotational position and to the first relative rotational position, for clamping the base (306) against the rim (281) of the tube (28) and for pressing the two th sealing member (304) against the edge (281) of the tube (28), then activating the first sealing member (310) to press against the column (27) in the bushing (3061).
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    同族专利:
    公开号 | 公开日
    WO2017085221A1|2017-05-26|
    EP3377795A1|2018-09-26|
    US10692614B2|2020-06-23|
    ZA201802935B|2019-02-27|
    CN108291680B|2019-08-16|
    FR3044068B1|2017-12-22|
    ES2730176T3|2019-11-08|
    EP3377795B1|2019-03-20|
    CN108291680A|2018-07-17|
    US20190341159A1|2019-11-07|
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    法律状态:
    2016-11-30| PLFP| Fee payment|Year of fee payment: 2 |
    2017-05-26| PLSC| Publication of the preliminary search report|Effective date: 20170526 |
    2017-11-30| PLFP| Fee payment|Year of fee payment: 3 |
    2019-11-28| PLFP| Fee payment|Year of fee payment: 5 |
    2021-08-06| ST| Notification of lapse|Effective date: 20210705 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1561211A|FR3044068B1|2015-11-20|2015-11-20|DEVICE FOR SEALING BETWEEN A TUBE AND A COLUMN THROUGH THE SAME, ITS MOUNTING METHOD|FR1561211A| FR3044068B1|2015-11-20|2015-11-20|DEVICE FOR SEALING BETWEEN A TUBE AND A COLUMN THROUGH THE SAME, ITS MOUNTING METHOD|
    US15/774,486| US10692614B2|2015-11-20|2016-11-17|Sealing device between a tube and a column passing through the latter, method for mounting same|
    CN201680067218.6A| CN108291680B|2015-11-20|2016-11-17|Pipe and the sealing device across the column of the pipe and the method for installing it|
    ES16802002T| ES2730176T3|2015-11-20|2016-11-17|Sealing device between a tube and a column that crosses it, its assembly procedure|
    EP16802002.2A| EP3377795B1|2015-11-20|2016-11-17|Sealing device between a tube and a column passing through the latter, method for mounting same|
    PCT/EP2016/078070| WO2017085221A1|2015-11-20|2016-11-17|Sealing device between a tube and a column passing through the latter, method for mounting same|
    ZA2018/02935A| ZA201802935B|2015-11-20|2018-05-04|Sealing device between a tube and a column passing through the latter, method for mounting same|
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