• 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 control rod drive device mounted on the bottom of a nuclear reservoir, and more particularly to a control rod drive device having a permanent magnet inside an electromagnet housing. . The training device includes a frame installed in a sealed container to be able to move up and down. The solenoid housing is formed with a magnetic material and installed on an outer circumferential surface of the sealed container facing the frame to be able to move up and down. A coil is installed in the solenoid housing. A non-magnetic body portion is formed with a non-magnetic material and installed on an inner surface of the electromagnet housing facing an outer surface of the sealed container, wherein the permanent magnet is installed at an inner top end. of the electromagnet housing.
    公开号:FR3016075A1
    申请号:FR1463401
    申请日:2014-12-29
    公开日:2015-07-03
    发明作者:Jin Haeng Lee；Hyung Huh；Yeong-Garp Cho；Yeonsik Yoo；Jong In Kim
    申请人:Korea Atomic Energy Research Institute KAERI；
    IPC主号:
    专利说明:

    [0001] CONTROLLED ROD DRIVE DEVICE MOUNTED ON THE BACKGROUND OF A NUCLEAR REACTOR HAVING A PERMANENT MAGNET INSIDE THE ELECTRO-MAGNET BOOT Cross-reference to the related application This application claims priority over and the benefit of the request for Korean patent 20130169173, filed December 31, 2013.
    [0002] BACKGROUND OF THE INVENTION The present invention relates to a bottom-mounted control rod drive, which is mounted at the bottom of a nuclear reactor, and more particularly to a control rod drive mounted on a the bottom having a permanent magnet inside an electromagnet housing, which is capable of generating a high holding force with respect to a small applied current, of easily replacing and repairing an electromagnet, and also increasing the use of a space around the electromagnet.
    [0003] Discussion of the Related Art Generally, in a research reactor using a bottom mounted control rod driver, a control rod is positioned around or above the core, and a driver for controlling a position of the control rod and stop the reactor is connected to a lower end of the control rod and positioned under the reactor. In many research reactors using such a control rod drive mounted on the bottom, the non-contact controlled drive devices using an electromagnet instead of the direct power transmission drive devices are mainly used to prevent pond water around the reactors from leaking to an outer side of the control device.
    [0004] In this case, the driving device comprises an electromagnet, a stepping motor, a spherical screw and a sealed container serving as a pressure limit. An armature connected with the control rod is positioned in the sealed container, and supported by a magnetic force generated by the electromagnet located at an outer side of the sealed container. At this time, a rotating force of the stepping motor is converted into upward and downward movement of the electromagnet through the ball screw to control a position of the control rod connected to the armature. Figure 1 schematically illustrates a main structure of a bottom mounted control rod driver used in a conventional research reactor. As illustrated in FIG. 1, the bottom-mounted control rod driver comprises an electromagnet 10 disposed at an outer circumference of a sealed container 2, a stepper motor 20 driving the electromagnet. 10 up and down, a spherical screw 30 connected with the stepper motor 20 to rotate it, a spherical nut 40 coupled with the electromagnet 10 to be moved up and down in the direction. 35 of the length of the spherical screw 30 when the spherical screw 30 is rotated, an armature 50 installed in the sealed container 2 near the electromagnet 10 and an extension rod 60 coupled with a connected control rod 4 to a nuclear fuel 3 to be interconnected and coupled with the lower armature. These are not described, bottom of one at its reference side 1, 12 and 14 respectively are a reactor, an electromagnet housing and a damper. In the bottom-mounted control rod drive device having such a structure, when the ball nut 40 ascends and descends by rotating the ball screw 30 through the stepper motor 20, the electromagnet 10 integrally coupled with the spherical nut 40 ascends and descends, and the armature 50 is integrally locked by an electromagnetic force by the electromagnet 10 to move up and down, so that the control rod 4 moves up and down . That is, when a current is supplied to and flows to the electromagnetic magnet, spherical 40 and sealed container through the electromagnet 10, is magnetized and generates the force and the electromagnet 10, the nut the armature 50 arranged in the 2 are held in a single integrated structure, by the electromagnetic force. In this state, when the stepper motor 20 is driven to rotate the spherical screw 30, the spherical nut 40 ascends and descends through the rotation of the spherical screw 30 and the integrated armature 50 with the spherical nut 30. 40 by the electromagnetic force is vertically moved up and down in the sealed container 2 and the extension rod 60 connected to the armature 50 is also vertically moved up and down jointly and thus the rod command 4 goes up and down. In the bottom-mounted control rod driver having the aforementioned drive mechanism, when the electromagnet 10 interacting with the armature 50 has been designed, it has been attempted that the current applied to the armature The electromagnet 10 is considerably increased to increase the mutual electromagnetic force (holding force) between the armature 50 and the electromagnet 10, or an upper permanent magnet 52 and a lower permanent magnet 54 of the armature 50 are additionally provided. to increase the holding force. However, when the current applied to the electromagnet 10 is increased as described above, the electromagnetic force (holding force) is increased, but there is a problem that a coil temperature in the electromagnet is also considerably increased. Therefore, there is a limitation that the applied current on the electromagnet can not be increased beyond a certain value. In this case, there is a disadvantage that a separate cooling device is required in addition to cool the temperature of the coil in the electromagnet. Furthermore, in the case of the method in which the permanent magnets are further disposed at the upper and lower ends of the armature 50 to enhance the holding force, the mutual electromagnetic force between the electromagnet 10 and the armature 50 is increased by permanent magnets. However, it is difficult to visually check damage to the permanent magnets due to a fall impact generated as the armature 50 moves up and down, and the permanent magnets may be contaminated with radioactivity and also, when the magnets are replaced. permanent contaminated, it is difficult to separate the sealed container 2 maintained in a sealed state. Therefore, there is a problem that diagnostic, replacement and repair operations are not easy. Meanwhile, different from the method in which the permanent magnets are further disposed at the upper and lower ends of the armature 50 to increase the holding force, there is an example in which the permanent magnets are arranged at the upper and lower outer ends of the electromagnet housing 12 to increase the holding force. Figure 2 illustrates another control rod drive device mounted on the conventional bottom in which the permanent magnets are disposed at the outer sides of an electromagnet housing. As illustrated in FIG. 2, the permanent magnets 24 and 25 are disposed at the upper and lower outer ends of the solenoid housing 12 and also the magnetic bodies 54 and 55 corresponding to the permanent magnets 24 and 25 are arranged in addition to the the upper and lower ends of a frame 50 in a sealed container 2, and thus attempts have been made to improve the holding force of the control rod drive. However, whereas in the case of this method, the operations of diagnosis, replacement and repair of permanent magnets are easy, the improvement of the holding force is low, compared to the existing method in which the permanent magnets are arranged at the upper and lower ends of the armature, and a longitudinal length of an electromagnet portion is increased due to a space occupied by the permanent magnets disposed at an outer side of the housing and sub-magnets. magnetic bodies disposed in the housing, and therefore there is a problem that lies in the fact that the efficiency is reduced, compared to the length of the electromagnet portion. Prior Art Documents Patent Documents Korean Patent 10-1169731 Japanese Patent Publication 1998-026685 Summary of the Invention The present invention relates to a bottom mounted control rod drive device 20 having a permanent magnet. inside an electromagnet housing, wherein the permanent magnet is installed at an inner upper portion of the solenoid housing, and a non-magnetic body zone design in the housing of The electromagnet facing an outer surface of a sealed container is improved, and thus the improvement of the high holding force can be induced with respect to a low applied current, compared to the case in which the permanent magnet is not installed, and the high holding force can be generated in the same space, compared to the case in which the permanent magnets are installed at an outer side of the electrical housing. and the electromagnet replacement and repair operations are easy, and also the use of space around the electromagnet can be greatly increased. According to one aspect of the present invention, there is provided a bottom mounted control rod drive having a permanent magnet inside an electromagnet housing, comprising a frame installed in a sealed container for ascend and descend ; the electromagnet housing 10 being formed with a magnetic material and installed on an outer circumferential surface of the sealed container facing the frame to be able to move up and down; a coil installed in the electromagnet housing; and a non-magnetic body portion formed with a non-magnetic material and installed on an inner surface of the electromagnet housing facing an outer surface of the sealed container, wherein the permanent magnet is installed at an upper end internal 20 of the electromagnet housing. The bottom mounted control rod driver may further include a magnetic body expansion portion formed by expanding a portion of the electromagnet housing such that certain areas of the non-magnetic body portion are filled. with the magnetic material that is the same as the solenoid case. An upper surface of the armature may be arranged on the same plane as an inner upper surface of the electromagnet housing. An upper end of the magnetic body expansion portion may be disposed at an upper side with respect to a transverse central axis of the electromagnet housing.
    [0005] A lower end of the magnetic body expansion portion may be integrally connected to an inner lower end of the electromagnet housing.
    [0006] Brief Description of the Drawings The above objects, features, and advantages of the present invention as well as others will become more apparent to those skilled in the art by describing its exemplary embodiments with reference to the accompanying drawings, in which: FIG. a conceptual view illustrating a bottom-mounted control rod driver in which permanent magnets are installed at the upper and lower ends of a frame; Fig. 2 is a conceptual view illustrating a bottom-mounted control rod driver in which permanent magnets are installed at the outer upper and lower ends of an electromagnet housing; FIG. 3 is a structural view illustrating a structure of a bottom mounted control rod driver in which a permanent magnet is disposed within an electromagnet housing according to an embodiment of the invention. present invention; Fig. 4 is a detailed view illustrating an electromagnet portion in the control rod driver mounted on the bottom of Fig. 3 in detail; FIG. 5 is a comparative view illustrating a magnetic flux density distribution in the case where a frame is positioned at a center of the electromagnet housing, and in a relative position of the frame and housing of electromagnet, which generates the maximum holding force; Fig. 6 is a comparative view illustrating finite element analysis in electromagnetic field analysis, when a magnetic body region of an inner surface of the electromagnet housing is expanded, and a magnetic flux density distribution in the relative position of the armature and the solenoid housing, which generates the maximum holding force; Fig. 7 is an analysis view illustrating a magnetic flux density distribution and a vector distribution in a rigid position of the armature and the electromagnet housing, which generates the maximum holding force, when the magnetic body zone the inner surface of the electromagnet housing is expanded and a non-magnetic body surface does not exist; FIG. 8 is a comparative view illustrating a magnetic flux density vector distribution in the relative position of the armature and the electromagnet housing, which generates the maximum holding force, when the permanent magnet is installed only in a the inner upper portion of the solenoid housing, and when the permanent magnet is installed on both the inner upper and lower portions of the solenoid housing; Fig. 9 is an analysis view illustrating a magnetic flux density vector distribution in the relative position of the armature and the electromagnet housing, which generates the maximum holding force, when the permanent magnet is installed only on the inner upper portion of the electromagnet housing, and the non-magnetic body region of the inner surface of the electromagnet housing is reduced, and the magnetic body region is increased thereon; and Fig. 10 is a view illustrating each analysis case for analyzing an influence of the presence or absence of the permanent magnet and the magnetic body region of the inner surface of the electromagnet housing 10 as a result of increasing the holding force of the control rod drive. Detailed description of the main elements 15 1: bottom surface of the reactor 2: sealed container 3: nuclear fuel 4: control rod 20 20: stepper motor 30: spherical screw 40: spherical nut 50: armature 60: extension rod 25 100: electromagnet 110: coil 120: solenoid housing 130: permanent magnet 140: non-magnetic body portion 30 E: magnetic body expansion part Detailed description of the exemplary embodiments Hereinafter, a drive device A bottom mounted control rod having a permanent magnet within an electromagnet housing according to a preferred embodiment of the present invention is described in detail with reference to the accompanying drawings.
    [0007] However, in the embodiment of the present invention, the same components as those of the prior art are designated by the same reference numerals described in the prior art. Fig. 3 is a structural view illustrating a structure of a bottom-mounted control rod driver in which a permanent magnet is disposed within an electromagnet housing according to an embodiment of the invention. FIG. 4 is a detailed view illustrating an electromagnet portion in the control rod drive device mounted on the bottom of FIG. 3, in detail. Referring to FIGS. 3 and 4, the bottom mounted control rod drive having the permanent magnet inside the electromagnet housing comprises an extension rod 60 coupled with a lower end of a control rod 4 connected to a nuclear fuel 3, a frame 50 connected with a lower end of the extension rod 60 and installed to be able to move up and down, a sealed container 2 housing the extension rod 60 and the frame 50 inside the latter, an electromagnet housing 120 installed to cover an outer surface of the sealed container 2 and to be able to move up and down and formed with a magnetic material, a coil 110 installed in the electromagnet housing 120 and a electromagnet 100 comprising a non-magnetic body portion 140 disposed between the sealed container 2 and the coil 110 and formed of a non-magnetic material.
    [0008] The extension rod 60 is a structure for transmitting the upward and downward driving force of the armature 50 transmitted from a drive unit to the control rod 4. The extension rod 60 is connected to the fuel nuclear 3 and the control rod 4 positioned at its upper side. The extension rod 60 is installed to descend through a bottom surface 1 of a nuclear reactor from an inner side of the nuclear reactor. The armature 50 is connected with a lower end of the extension rod 60 which passes through the bottom surface 1 of the nuclear reactor and is extended downward, and installed to be able to move vertically up and down. . In addition, the armature 50 is driven up and down by the drive unit to drive up and down the control rod 4 connected with an upper end of the rod 20. 60. The sealed container 2 is a sealed tube for housing the extension rod 60 and the frame 50, and is installed to pass through the bottom surface 1 of the nuclear reactor from the inner side of the nuclear reactor. At this time, the electromagnet 100 which is magnetized by a current applied from an outside and generates a gravitational force with the armature 50, is provided at an outer side of the sealed container 2. In addition, the drive unit is provided which drives up and down the electromagnet 100 to drive the armature 50 up and down in the sealed container 2 by means of the gravitational force generated by a 35 electromagnetic force.
    [0009] Here, the drive unit that drives the electromagnet 100 up and down includes a spherical nut 40 coupled to one side of the electromagnet 100, a spherical screw 30 coupled with the spherical nut 40, and a stepper motor 20 rotating the spherical screw 30. The spherical nut 40 is integrally coupled to one side of the solenoid housing 120, and the spherical screw 30 connected with the stepper motor 20 is coupled to the nut. The spherical screw 30 is locked with the stepping motor drive 20 to be rotated, and the electromagnet 100 coupled with the spherical nut 40 realizes the upward and downward linear motion according to the rotation of the spindle. During this time, the electromagnet 100 of the present invention comprises the electromagnet housing 120 formed with the magnetic material, the coil 110 installed in the solenoid housing 120, and the electromagnet 120. A non-magnetic body member 140 formed on an inner surface of the electromagnet housing 120 facing the outer surface of the sealed container 2. The solenoid housing 120 is installed to cover an outer circumferential surface of the sealed container 2, wherein the armature 50 is positioned, and the coil 110 to which the current is supplied from the outside, is installed in the solenoid housing 120. The non-magnetic body portion 140 formed with the non-magnetic insulating material is formed at an inner region of the solenoid housing 120 disposed between the outer surface of the sealed container 2 and an inner surface of the coil 110. The electromagnet 100 having such a structure 35 is installed on the outer circumferential surface of the sealed container 2 , in which the armature 50 is installed, to be vertically movable. At this time, an upper surface P of the armature 50 provided in the sealed container 2 and an inner top surface Q of the electromagnet housing 120 provided at the outer side of the sealed container 2 can be arranged on the same plan so that the maximum holding force (magnetic field) is generated between the electromagnet 100 and the armature 50 by the electromagnetic force. Of course, when the maximum holding force is required due to a design specification, a magnitude of the holding force can be controlled by varying a height difference between the upper surface P of the frame 50 and the inner upper surface Q of the solenoid housing 120. Also, a permanent magnet 130 which further increases the holding force generated by the electromagnetic force acting between the electromagnet 100 disposed at the outer side of the sealed container 2 and the armature 50 disposed in the sealed container 2, when the current is applied, is additionally installed in the solenoid housing 120. At this time, the permanent magnet 130 can not be installed individually at each of the internal upper and lower parts of the solenoid housing 120, but may be installed only on the inner upper portion of the solenoid housing 30 120 is located at an upper side of the coil 110. This is explained by the fact that an increase in the holding force between the electromagnet 100 and the armature 50 is not important when the Permanent magnet is installed at the inner lower portion of the solenoid housing 120. This will be described separately through a result of a magnetic field analysis to be described later in FIG.
    [0010] Also, a magnetic body expansion portion E formed by expanding a portion of the electromagnet housing 120 is formed at an inner side of the electromagnet housing 120, so that certain areas of the non-magnetic body portion 140 insulation between the sealed container 2 and the coil 110 are filled with the magnetic material which is the same as that of the solenoid housing 120. At this time, a lower end of the magnetic body expansion portion E is formed to be integrally connected to a lower end of the solenoid housing 120. In the magnetic body expansion portion E having such a structure, a non-magnetic body region provided in an existing electromagnet housing is greatly reduced. , and the reduced area is filled with the magnetic material which is the same as that of the solenoid housing, and thus the magnetic body area between the armature 50 and the electromagnet 100 is substantially expanded, with respect to an existing magnetic body zone. At this time, since the non-magnetic body area 140 having a certain gap must be provided on the inner surface of the solenoid housing 120 to influence the increase of the holding force, so that To increase the holding force, it is preferable that the area of the non-magnetic body portion 140 in the electromagnet housing 120 be minimized as much as possible, and that the magnetic body expansion portion E be maximized as much as possible. possible.
    [0011] An optimum zone ratio between the region of the non-magnetic body portion 140 and the magnetic body expansion portion E is affected by different parameters (a shape of the electromagnet, a material, a number of coil turns, or similar) and it is therefore preferable that the optimum area ratio be determined in an analytical method according to a design of the electromagnet. For example, an upper end of the magnetic body expansion portion E may be arranged to expand to a side greater than a transverse central axis C of the solenoid housing 120, specifically to the upper side in which the upper end of the magnetic body expansion part E is adjacent to the permanent magnet 130. This is explained by the fact that the inner upper end of the electromagnet housing 120 arranged on the same plane as the upper end of the armature 50 is a part in which a magnetic flux density is the highest and an increase in the magnetic flux density is also induced according to a permanent magnet installation 130 and thus the maximum holding force between 50 and the electromagnet 100. When the electromagnet 100 is designed in this way, its maintenance is easier, compared to the case in which the magnet The permanent magnet is disposed in the sealed container, as illustrated in FIG. 1, and the holding force can be increased, and the spatial efficiency can also be increased, compared to the case in which the permanent magnet is disposed on the outer side. of the solenoid housing, as shown in Figure 2.
    [0012] For reference, a reference numeral 14 which is not described is a damper installed on a lower surface in the sealed container 2 to perform a damping function when the armature 50 moves up and down. Meanwhile, Figure 5 illustrates a simulation of a relative position between the armature and the solenoid housing, which obtains the maximum holding force (electromagnetic force), through a computer analysis (element analysis finis), in which Fig. 5A illustrates a magnetic flux density distribution when the armature is positioned at a center of the electromagnet housing, and Fig. 53 illustrates the magnetic flux density distribution in the relative position. of the armature and the electromagnet housing, which generates the maximum holding force. In the simulation illustrated in FIG. 5, the holding force according to the relative position of the armature and the solenoid housing is analyzed by means of a Maxwell electromagnetic field analysis software. Here, since an influence of the non-magnetic body area on the magnetic field can be ignored, the non-magnetic body area is not modeled separately in an electromagnetic field analysis, and an analysis on a two-dimensional axisymmetric shape is realized, taking into consideration that the shapes of the armature and the electromagnet housing are axially symmetrical. When an electromagnetic field simulation is performed with respect to the embodiment of FIG. 5A, it can be understood that in the armature and the electromagnet housing which are symmetrical at the top and bottom with respect to the electromagnet without the permanent magnet, when the armature is positioned in the center of the electromagnet housing, the holding force (electromagnetic force) is close to "0" N, and thus the generation of the holding force hardly takes place but when the upper end of the armature is arranged to be positioned on the same plane as the inner upper end of the electromagnet housing, as shown in Figure 5B, the maximum holding force is obtained. At this time, the relative position of the armature and the electromagnet housing, with which the maximum holding force is obtained, is also applied, regardless of the presence and absence of the permanent magnet, and the symmetry of the armature and the electromagnet housing. Fig. 6 is a comparative view illustrating the finite element analysis in electromagnetic field analysis, when the non-magnetic body area of the inner surface of the electromagnet housing is reduced and the magnetic body area is expanded, and the magnetic flux density distribution in the relative position of the armature and the electromagnet housing, which generates the maximum holding force, to describe an effect generated by forming the magnetic body region in the non-core area. Magnetic surface of the inner surface of the electromagnet housing.
    [0013] As an electromagnet housing structure shown in Fig. 6A, when the non-magnetic body area of the inner surface of the electromagnet housing is reduced and the magnetic body area is expanded, the maximum holding force appears at the an upper end of the expanded magnetic body, as shown in Figure 6B. Here, when the non-magnetic body area located on the inner surface of the electromagnet housing does not exist, i.e. the entire inner surface of the electromagnet housing is formed with the magnetic material, the upper end of the expanded magnetic body shown in Figure 6B disappears, and the increase of the holding force does not occur. Fig. 7 illustrates a magnetic flux density distribution and a vector distribution in a relative position of the armature and the solenoid housing, which generates the maximum holding force when the magnetic body region of the inner surface of the magnet housing. electromagnet is expanded and that does not exist. As illustrated magnetically in Figs. 7A and 7B, the non-body area when there is only the expanded magnetic body area on the inner surface of the electromagnet housing, the maximum holding force is obtained when the inner top surface of the electromagnet housing and the upper surface of the armature are on the same straight line. However, the maximum holding force in this case is considerably reduced, compared with the cases of FIGS. 5 and 6. Therefore, it can be understood that the non-magnetic body area having at least some space must be provided on the surface. internal-of the electromagnet housing. At this time, an optimal size of the non-magnetic body area is determined by an analytical method. Meanwhile, FIG. 8 is a comparative view illustrating a magnetic flux density vector distribution when the permanent magnet is installed only at the inner upper portion of the solenoid housing, and when the permanent magnet is installed. at all the upper and lower internal parts of the solenoid housing. First, Figs. 8A and 80 illustrate information regarding a shape, a size and a physical property of each of the magnetic body (the frame and the electromagnet housing), the permanent magnet, and the coil. used in electromagnetic field analysis when the permanent magnet is installed only at the inner upper part of the solenoid housing, and when the permanent magnet is installed on both the internal upper and lower parts of the magnet housing electromagnet and a length of the electromagnet housing is increased by a length of the permanent magnet. FIGS. 8B and 8D illustrate a result of carrying out each electromagnetic field analysis, according to the embodiments of FIGS. 8A and 80. Like the embodiment of FIG. 8A, when the permanent magnet is installed only at the level of FIG. of the inner upper portion of the solenoid housing, the maximum holding force calculated from the electromagnetic field analysis is 388 N. However, as illustrated in Figure 80, when the permanent magnet is installed at a time at the inner upper and lower parts of the solenoid housing and the length of the solenoid housing is increased by the length of the electromagnet, the maximum holding force is 411 N.
    [0014] When the permanent magnet is installed at both the upper and lower internal parts of the solenoid housing, the holding force of the electromagnet is slightly increased (about 23 N, from 388 N to 411 N) , relative to the moment when the permanent magnet is installed only at the inner upper part of the solenoid housing and the entire length of the solenoid housing is also increased by 8 mm (from a total length of 153 mm to 161 mm) and thus it can be considered that there is no effect of increasing the holding force relative to the spatial efficiency. As shown by such results, when the permanent magnet is installed at the inner lower end of the electromagnet housing, there is no advantage in the appearance of the holding force with respect to the 'space. However, it should be understood that a great benefit can be obtained by increasing the holding force, when the permanent magnet is installed only at the inner upper portion of the solenoid housing, and the non-magnetic body area of the inner surface of the electromagnet housing is reduced and that the magnetic body area is increased, as a structure of the present invention illustrated in Fig. 9. In the embodiment of Fig. 9A, only the magnetic body area is expanded on the inner surface of the electromagnet housing of the embodiment of Fig. 8A. Figure 9A illustrates the information regarding the shape, size, and physical property of each of the magnetic body (the armature and the electromagnet housing), the permanent magnet, and the coil used in the analysis of the magnetism. electromagnetic field, and Figure 9B illustrates a result of performing each electromagnetic field analysis according to the embodiment of Figure 9A. As shown in the magnetic field analysis result of Fig. 9B, when only the magnetic body region of the inner surface of the electromagnet housing is expanded in the embodiment of Fig. 8A, the maximum holding force is 487 N, and thus it can be understood that a holding force increase effect of about 25% is obtained with respect to the maximum holding force of 388 N obtained in the embodiment of the present invention. Figure 8A. The influences of the permanent magnet and the magnetic body region of the inner surface of the electromagnet housing due to an increase in the electromagnetic force are quantitatively compared and estimated by combining all the results and calculating the maximum holding force. the control rod drive 20 according to the presence or absence of the permanent magnet and a length of the magnetic body region of the inner surface of the electromagnet housing by ANSYS Maxwell analysis. The shapes of the electromagnets compared and the resulting maximum holding force of the control rod driver are illustrated in Fig. 10 and in the following Table 1. Table 1 30 Comparison of the maximum holding force for each case of analysis Case Presence and Length of the Force of Absence absence magnetic body of the internal surface of the case (mm) maintenance of increase of maximum magnet the force of permanent ( N) maximum hold with respect to case 1 (%) 1 X 0 213 - 2 X 102 304 43 3 0 0 388 82 4 0 102 487 129 In Figure 10, cases 1 and 2 are cases in which it is assumed that a permanent magnet zone is filled with magnetic material. The results in Table 1 are as follows. When the permanent magnet is not provided and the length of the magnetic body of the inner surface of the electromagnet housing is "0" (case 1), the maximum holding force is 213 N. Here, when the only the permanent magnet is added (case 3), the maximum holding force increased is about 82%, based on case 1. When the length of the magnetic body of the inner surface of the solenoid from the bottom surface is increased by 102 mm, based on case 1 (case 2), the maximum holding force increased is 43%. And in the case of case 4 in which case 2 and case 3 are combined, the maximum holding force is increased by 129%, compared to case 1. When case 2, in which the length of the magnetic body of the inner surface of the solenoid housing is increased, is compared with case 4, it should be understood that the holding force is increased by about 60%, when the permanent magnet is further provided at the inner upper end of the the magnet body, and as the length of the magnetic body of the inner surface of the electromagnet housing is increased, the holding force is increased by about 26% compared to case 3 and case 4.
    [0015] As represented by such results, it should be understood that case 4 in which the permanent magnet is installed only at the inner upper end of the solenoid housing, the non-magnetic body area of the inner surface of the housing The electromagnet is reduced and the magnetic body area is expanded, has a much greater advantage in increasing the maximum holding force of the control rod drive. Meanwhile, in the case of the permanent magnet further provided at the inner upper portion of the solenoid housing for improving the maximum holding force of the control rod drive device, limiting a temperature service varies depending on its material composition. The maximum operating temperature of the electromagnet designed to be applied in a conventional research reactor is estimated to be about 200 ° C or less. However, if the present invention in which the permanent magnet is added to the inner upper portion of the solenoid housing is applied, a high holding force can be induced and the applied current can also be reduced and therefore it is believed that an internal temperature of the solenoid coil can be maintained from 100 to 150 ° C or less. Since there is a slight difference in temperature between the maximum internal temperature of the solenoid coil and the temperature in the position of the permanent magnet, the maximum temperature in a service environment can be determined by measuring the temperature by real experience, and so we can determine the material of the permanent magnet. Generally, a neodymium-based permanent magnet (NdFeB) has better performance than a samarium cobalt-based permanent magnet (SmCo), but has a lower Curie point and also a lower maximum service temperature. However, the NdFeB permanent magnet can improve such a problem and thus be used even at 200 ° C or more, has recently been developed and used. Therefore, a high performance permanent magnet that sufficiently supports the case in which a temperature around the permanent magnet reaches about 200 ° C can be used. Table 2 below describes the information of a type of BdFeB permanent magnet and the operating temperature. Table 2 - Temperature Characteristics of NdFeB Qualities (www.ndfeb-info.com Suffix Type Magnet Is Maximum Working Temperature (° C) 100 * - 'I-14-' 1204- 'SFII-' 150I- 'UI- As described above, the control rod drive device which can achieve the maximum holding force can be realized as described above. by using the high performance permanent magnet which sufficiently withstands even the case in which the temperature around the permanent magnet added to the inner upper portion of the solenoid housing reaches about 200 ° C. As described above, in the bottom mounted control rod drive according to the present invention, the permanent magnet is installed at the inner upper end of the solenoid housing and the non-magnetic body region inside the housing electromagnet facing the sealed container is reduced, and the area As a result, the significant improvement in the holding force can be induced with the small current applied compared to the case in which the permanent magnet is not installed, and the improvement can also be induced. significantly more of the holding force in the same space, compared to the case in which the permanent magnet is installed at the outer side of the solenoid housing. Also, the electromagnet replacement and repair operations are easy when servicing the control rod drive and the use of the space around the electromagnet can be increased. Also, when a plurality of electromagnets, such as multiple assemblies, are interconnected and then used, it is possible to reduce the interference between the permanent magnets and thus the durability of the electromagnet can be improved. According to the present invention having the above-mentioned structure, the permanent magnet is installed at the inner upper end of the solenoid housing, and the non-magnetic body region within the electromagnet housing facing the outer surface of the sealed container is reduced to a predetermined rate, and the magnetic body area 35 is increased. Therefore, the significant improvement of the holding force can be induced with the small current applied, compared to the case in which the permanent magnet is not installed, and it is also possible to induce the much greater improvement in the resistance. holding force in the same space, relative to the case in which the permanent magnet is installed at the outer side of the solenoid housing. Also, when a plurality of electromagnets, such as multiple assemblies, are connected to each other and then used, it is possible to reduce an interference distance between the permanent magnets, in relation to the case in which the permanent magnet is disposed at the outer side of the solenoid housing, and thus the electromagnet can have a compact size, and the use of space around the electromagnet can be further increased. Also, because of the improvement in the holding force of the electromagnet, as described above, the rigidity of the armature can be increased. That is, when a load on the armature is changed, it is possible to reduce a change in the relative position of the armature and the electromagnet, and thus an output of a heart can be controlled stably. Instead of the permanent magnet being installed in the sealed container, the permanent magnet is installed at the inner side of the solenoid housing, and thus the permanent magnet can not be damaged due to a falling impact. , and the electromagnet diagnostic, replacement and repair operations are relatively easy, compared to the existing method in which the permanent magnet is installed in the sealed container. It will be apparent to those skilled in the art that various modifications may be made to the exemplary embodiments described above of the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover all such modifications provided they fall within the scope of the appended claims and their equivalents.
    权利要求:
    Claims (5)
    [0001]
    REVENDICATIONS1. A control rod drive device mounted on the bottom of a nuclear reactor having a permanent magnet within an electromagnet housing, comprising: a frame installed in a sealed container for up and down; the electromagnet housing formed with a magnetic material and installed on an outer circumferential surface of the sealed container facing the frame to be able to move up and down; a coil installed in the electromagnet housing; and a non-magnetic body portion formed with a non-magnetic material and installed on an inner surface of the electromagnet housing facing an outer surface of the sealed container, wherein the permanent magnet is installed at one end internal upper of the solenoid housing.
    [0002]
    The drive device of claim 1, further comprising a magnetic body expansion portion formed by expanding a portion of the electromagnet housing so that certain areas of the non-magnetic body portion are filled with the material. magnetic which is the same as the solenoid housing. 30
    [0003]
    The drive device of claim 1, wherein an upper surface of the armature is arranged on the same plane as an inner upper surface of the electromagnet housing. 35
    [0004]
    The drive device of claim 2, wherein an upper end of the magnetic body expanding portion is disposed at an upper side with respect to a transverse center axis of the electromagnet housing.
    [0005]
    The drive device of claim 2, wherein a lower end of the magnetic body expansion portion is integrally connected to an inner lower end of the electromagnet housing.
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    同族专利:
    公开号 | 公开日
    KR20150079134A|2015-07-08|
    KR101548060B1|2015-08-27|
    FR3016075B1|2020-01-03|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2018075107A3|2016-07-13|2018-07-26|Ge-Hitachi Nuclear Energy Americas Llc|Magnetically-actuated isolated rod couplings for use in a nuclear reactor control rod drive|
    US20200103017A1|2018-10-01|2020-04-02|Dana Automotive Systems Group, Llc|Retention system|
    US10770189B2|2016-07-13|2020-09-08|Ge-Hitachi Nuclear Energy Americas Llc|Magnetically-actuated isolated rod couplings for use in a nuclear reactor control rod drive|KR100279104B1|1998-12-18|2001-01-15|장인순|Control rod unauthorized withdrawal prevention device|
    KR101169731B1|2011-05-20|2012-07-31|한국원자력연구원|Hybrid bottom mounted control rod drive device|KR102284601B1|2019-11-26|2021-08-03|한국원자력연구원|Safety locking apparatus for nuclear fuel fixing equipment and nuclear fuel fixing equipment having the same one|
    法律状态:
    2015-12-30| PLFP| Fee payment|Year of fee payment: 2 |
    2016-12-07| PLFP| Fee payment|Year of fee payment: 3 |
    2017-12-13| PLFP| Fee payment|Year of fee payment: 4 |
    2018-12-24| PLFP| Fee payment|Year of fee payment: 5 |
    2019-12-12| PLFP| Fee payment|Year of fee payment: 6 |
    2020-09-23| PLFP| Fee payment|Year of fee payment: 7 |
    2021-09-27| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020130169173|2013-12-31|
    KR1020130169173A|KR101548060B1|2013-12-31|2013-12-31|Bottom mounted control rod drive device having permanent magnet inside electromagnet casing|
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