• 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 oil level sensor of the invention is associated with a reservoir (3) containing oil and comprises a float (15) movable along guide means and which can float on the oil (51) of the reservoir, for moving with the oil level, a movable permanent magnet with the float, and an electronic card (20) provided with magnetic switches responsive to said magnet. The guide means of the spherical float are arranged around the float and have with said float contacts limited to three substantially linear zones.
    公开号:FR3036792A1
    申请号:FR1554919
    申请日:2015-05-29
    公开日:2016-12-02
    发明作者:Eloise Pauline Roux
    申请人:SNECMA SAS；
    IPC主号:
    专利说明:

    [0001] The invention relates to a liquid level sensor, in particular an oil level sensor (also known as OLS -Oil Level Sensor-), for gas turbine aircraft engines, associated with a reservoir containing the fluid whose level is to be detected. In US 6,679,286 is disclosed an assembly comprising: - a reservoir containing a liquid, here water, - and a level sensor of this liquid, comprising: - a floating float along guide means and which floats on the liquid of the reservoir or on a volume of liquid in communication by the principle of communicating vessels with the liquid of the reservoir, so that the float moves with the level of liquid in the reservoir, - at least one permanent magnet movable with the float, - an electronic card provided with magnetic switches sensitive to said magnet. A problem of this installation is that in the event of decentering along the length of the guiding means, the catch-up of the coaxiality tolerances with respect to the upper centering can be operated by the liquid level sensor which supports the force associated with the misalignment by deforming. This deformation can weaken the sensor and may cause it to break. It may then be necessary to strengthen the sensor in its sensitive areas. This reinforcement however increases the mass of the sensor, which has an impact on the design of the tank (mechanical strength) and therefore on the engine consumption. And this problem is even more important when the tank is rigidly mounted on the engine (no dampers). The vibrations experienced by the sensor are then greater, causing more stress in the sensor.
    [0002] Another problem relates to the risk of jamming of the float along its guide means.
    [0003] Indeed, in order for the float to slide along the guide means (a tube in US 6,679,286), some clearance is left between the float and the tube. However, if the float gets stuck by skewing along the tube, the oil level information provided by the sensor is then erroneous because the float no longer follows the change in oil level remaining in the tank. . An object of the present invention is to provide a solution to this, by ensuring reliable operation with controlled mass and mechanical stresses.
    [0004] To this end, it is proposed that the float guide means are arranged around the float and have with said float contacts limited to three substantially linear zones. Thus, the assembly will be isostatic. To combine ease of manufacture and efficiency of the guide, it is recommended that the three contact zones are defined, for the guide means, by three rails with contacts (or supports) substantially linear. And to properly separate the functions and here again secure the operation of the electronic card provided with magnetic switches, it is recommended that this electronic card be located laterally away from the volume circumscribed by said three substantially linear contact areas. In addition, to secure the quality of the level reading, it will be preferred that the float be dimensioned so that the center of the integrated magnet is at the level of the free surface of the oil or, in other words, that the magnet permanent is located in the center of the float. It should also be noted that the above-mentioned components are intensively integrated with one another and that constraints are limited in the event of misalignment between the tank and the axis of displacement of the float. A goal is also to secure the operation of the electronic card, again by limiting the mechanical stresses it may have to cash, and to limit the support of the float / means 3036792 3 guide / electronic card to a only holding zone vis-à-vis the tank (a priori to an upper mouth or at the location of an orifice passing through an upper wall of the tank) and thus to gain mass.
    [0005] To approximate all or part of these aims, it is proposed in particular that, linearly, the three aforementioned contact zones are elongated in a curved profile and that the electronic card, maintained along said guide means, is extended substantially along said profile. . And, in particular to allow adaptation to a reservoir and / or guide means curved (s) or curvilinear (s), it is expected that the electronic card provided with magnetic switches sensitive to said magnet can be flexible. As for the adaptation of the profiles, it is advisable: a) that the reservoir is elongated in a curved profile along which the said three contact zones extend substantially and linearly, and that the guide means, with the said three contact zones, the float and the electronic card are arranged in the reservoir, within a space which, for the circulation of the fluid, communicates with the reservoir through orifices, 20 - b) or that a tube is furthermore provided outside the reservoir, connected to it and communicating with it for the flow of fluid, the outer tube containing the guide means with said three contact zones, the float and the electronic card, the tank being elongated in a curved profile along of which said three contact zones will be substantially and linearly extended, and the guiding means with said three contact zones, - c) or again, in connection with the solution b), that the reservoir has a recess longitudinal recess in which the outer tube will be disposed.
    [0006] The invention will be better understood and other details, features and advantages relating thereto may be more clearly apparent on reading the description which follows, given by way of nonlimiting example and with reference to the appended drawings. , in which: - Figures 1 and 5 schematically a reservoir assembly and oil sensor, according to two possible interesting embodiments, - Figures 2 and 3 are two diagrams, respectively in cross-section II-II and in axial section (zone III of Figure 1), - Figure 4 is an elevational diagram of an electronic card suitable for the invention, in the other figures, - and Figure 6 is a diagram along the cross section VI-VI.
    [0007] FIG. 1 thus shows a functional assembly 1 comprising a reservoir 3 containing a liquid, here oil, 5, and an oil level sensor 7 intended to detect the level 50 of the oil in this reservoir. The tank 3, closed bottom 4, is an elongated piece belonging to an enclosure 9 which has, here at its top, an opening 11 15 for a return of the oil into the tank. Another opening, not shown, serves for manual filling of the tank 3. Fixing lugs (not shown) can be used to rigidly fix the tank 3 to a structural fixed part of the aircraft engine concerned.
    [0008] The sensor 7 comprises: - a float 15 movable along guide means 17 (see FIGS. 2, 3) and which floats on a volume of oil 51 (free surface 510) in communication by the principle of communicating vessels with the reservoir oil, so that the float moves with the level of oil in the tank, at least one permanent magnet 19 movable with the float, and an electronic card provided with magnetic switches, or reed switches in English, 21a, 21b ... 210 (FIG. 4) sensitive to the magnetism of the magnet 19. In the preferred example, the float is spherical. However, its shape does not affect the quality of the information as long as the magnet 19 can close the switches or switches of the electronic board 20. Thus, the float could be mounted in a ball bushing or rolls for example. The operating principle of the electronic card 20, with its magnetic switches 21a, 21b ... 210 (Figure 4) interacting with the magnet 19 is known. This is not the object of the invention. FIG. 4 (extracted from US Pat. No. 4,976,146) thus schematizes only an exemplary embodiment, with a printed circuit board 210 which is positioned on a plurality of spaced apart blade switches generally indicated by reference numeral 21 and which includes switches Individuals 21a et al. A non-magnetic conduit 23 such as PVC or fiberglass surrounds and protects the circuit board 210 and the switches 21, from the surrounding liquid. The electronic board 20 is elongate and is arranged with the switches 21 to extend along the path that the float 15 can travel in its oil level track. A suitable electrical connection is established between the circuit board 210 and the blade switch array 21 for connection to an indicating means (such as a display not shown) for indicating the vertical position of the float relative to the Thus, when the level 50 of the liquid changes, the level 510 also changes and the float 15 moves relative to the switches 21, thereby providing a display of the level 50 of the liquid. As is conventional, the reed switches 21 may be made of first and second conductors which, when exposed to the same pole of an external magnetic field, are repelled by closing the passage. while the wires are exposed to opposite poles of this magnetism, the outer wires are attracted to each other and close the switch. Independently of the manner of making the board 20 and the wireless communications to be established between the magnet 19 of the float and the switches 21, a feature of the invention lies in the fact that the spherical float guide means 17 15 are arranged around the float and have with said float contacts, or supports, limited to three substantially linear zones marked 17a, 17b, 17c Figure 2; see also figure 3.
    [0009] Thus, it is possible to provide isostatic guidance and to be able to adapt the mounting of the above solution to tanks 3, 33, 43 (FIGS. 1, 6, 6) with a general longitudinal profile (FIGS. ) Curved or curved, and not just rectilinear as that of US 6 679 286. It will be understood that the general longitudinal profile is the general line along which the float moves and therefore which must substantially extend longitudinally the circuit board 210 and the switches 21. The three zones 17a, 17b, 17c are substantially linear as soon as they define their contacts with the sphere 15 generally along lines (or surfaces of small thicknesses, of the order, for example, of mm ). Moreover, FIG. 2 shows that the free ends of the three contact zones 17a, 17b, 17c can each define a tip or a tapered portion. The views of FIGS. 2 and 3 show that the three contact zones 17a, 17b, 17c will thus be favorably defined by three elongated rails with 20 contacts, thus substantially linear with the outer surface of the sphere 15. The elongation will follow the profile considered, 25 or 35. The electronic card 20, fixed to its support 27, is right in front of the sphere 15. More precisely, the electronic card provided with the magnetic switches 21 is located laterally with respect to the direction of elongation 25. or 35, away from (around) the volume circumscribed by said three contact zones. Thus, the efficiency as to the free guided sliding of the float 15, and therefore the quality and reliability of the measurements, will be optimum and all the more so if, as illustrated, the permanent magnet 19 is located at the center of the spherical float, a single such magnet proving sufficient.
    [0010] The magnet 19 may in particular be spherical; and the float full, so that its matter keeps the magnet centered. In the solution of FIG. 1, a tube 31 external to the tank 3 and connected to it communicates with this reservoir for the circulation of the oil.
    [0011] In the example, two communication orifices 34, 36 are provided here respectively towards the top and the closed lower bottom 38 of the tube 31. The principle of communicating vessels for the oil is provided by the lower orifice 36. the tube 31 is quite rigid, its strength and its mechanical connection with the reservoir 3 can be ensured only by the two short transverse pipes having the orifices 34,36. Linearly elongated along the curved profile, such as 25 or 35, the three arms 37a, 37b, 37c each carrying a contact zone project individually internally from the tube 31. They are distributed at 1200 from each other, around the spherical float 15.
    [0012] Maintained along these means, between two arms, by its (its) supports 27, for example by gluing, the electronic card 20 also extends substantially along said profile. For this, two possibilities in particular: the card is rigid for example of polymide, but has been preformed to follow the curved or curvilinear profile that is appropriate, or the electronic card 20 provided with magnetic switches sensitive to said magnet is flexible, for example to graphene base. With respect to the embodiment of FIG. 1, that of FIG. 5 presents the following differences: the guiding means, with said three contact zones, the spherical float 15 and the electronic card 20 are arranged in the tank 33, at the within a space 39 which, for the circulation of the oil, communicates through orifices 41 with the reservoir 33, the element of the enclosure 29. The difference of the enclosure 29 with respect to the enclosure 9 is therefore that the tank 33 incorporates the sensor 7 which went along the outside of the tank 3, FIG.
    [0013] The orifices 41 may be formed, all along the card 20, in a tubular wall 43 closed locally by a zone 330 full of the reservoir 33. The three arms 37a, 37b, 37c of FIG. this case protrudes internally, some of the tubular wall 43, another of the zone 330. Supports such as the tabs 27 can hold the card 20 along the tubular wall 43 which will therefore be longitudinally and as illustrated, substantially in the shape of the profile 35, as was the general line of the tube 31 with the profile 25. Figures 1 and 5, it will also be noted that at the top of the tank, the sensor 7, and more particularly the card 20, is connected to ) to a connector 45 by which the oil level information detected by the magnetic switch device 21 can be directed to the appropriate processing system of the aircraft engine. Figure 6 now: in this version, the reservoir, here referenced 43 43, has, as a difference with respect to the reservoir 3, a recess longitudinal recess 47 in which the outer tube 31 has been arranged. The recess 47 extends along and substantially to the shape of the profile 25. The fluid connection and relative maintenance can again be obtained by the two short transverse pipes respectively having the orifices 34,36 (not visible in Figure 6). This variant makes it possible to limit the space requirement and to stiffen the tank. In terms of advantages, it may also be noted: - limitation, or even elimination, of certain installation constraints, since the sensor matches the shapes of the tank (no need for intermediate support in the tank), - weight gain via the removal of this intermediate support and frequent mechanical reinforcements in the body of the sensor, and the decrease in the number of guides for the spherical float (rails).
    [0014] The invention is applicable to any type of level probe installed in a fluid reservoir.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. An assembly comprising: - a reservoir (3,33,43) containing a liquid, such as oil, - and a sensor (7) of the fluid level, comprising: - a float (15) movable along means of guide (17) and which floats on the liquid of the reservoir or on a volume of liquid in communication by the principle of communicating vessels with the liquid of the reservoir, so that the float moves with the level of liquid in the reservoir, - at less a permanent magnet (19) movable with the float, - an electronic card (20) provided with magnetic switches (21) responsive to said magnet, characterized in that the float guide means (19) are arranged around the float and have with said float contacts limited to three substantially linear zones (17a, 17b, 17c).
    [0002]
    2. The assembly of claim 1, wherein the three contact areas (17a, 17b, 17c) are defined, for the guide means, by three rails with substantially linear contacts.
    [0003]
    3. The assembly of claim 1 or 2, wherein the electronic card provided with magnetic switches (21) responsive to said magnet is located laterally away from the volume (39) circumscribed by said three substantially linear contact areas.
    [0004]
    4. Assembly according to one of claims 1 to 3, wherein the permanent magnet is located in the center of the float.
    [0005]
    5. An assembly according to one of claims 1 to 4, wherein, linearly, said three contact zones (17a, 17b, 17c) are elongate in a curved profile (25,35) and the electronic card (20), maintained along said guide means (17), is substantially elongated along said profile. 3036792 10
    [0006]
    6. An assembly according to one of claims 1 to 5, wherein the electronic card (20) provided with magnetic switches (21) responsive to said magnet is flexible.
    [0007]
    7. Assembly according to one of claims 1 to 6, wherein the reservoir (33) is elongated in a curved profile (35) along which substantially and linearly extend said three contact zones, and the guiding means. (17), with said three contact zones (17a, 17b, 17c), the float (15) and the electronic card (20) are arranged in the reservoir, within a space which, for the circulation of the fluid, 10 communicates with the reservoir through orifices (41).
    [0008]
    8. Assembly according to one of claims 1 to 6, which further comprises a tube (31) external to the reservoir (3,43) connected to it and which communicates with it for the circulation of the liquid, the outer tube containing the means guide (17) with said three contact areas (17a, 17b, 17c), float (15) and electronic board (20), the tank being elongated in a curved profile (25,35) along which substantially and linearly extend said three contact zones, and the guide means with said three contact zones.
    [0009]
    9. The assembly of claim 8, wherein the reservoir (43) 20 has a recess longitudinal recess (47) (43) in which the outer tube (31) is disposed.
    [0010]
    10. Turbomachine comprising an assembly according to one of claims 1 to 9.
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    FR3036792B1|2017-06-30|
    引用文献:
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    CN105264344B|2013-02-26|2019-02-01|肖勒公司|For storing the storage modules of the hydrogen peroxide for using with the associated hydrogen peroxide vaporizer of precompressor|
    CN103575365B|2013-11-08|2016-05-11|北京亿华通科技有限公司|Liquid level is taken into account vehicle-mounted LNG gas cylinder|
    CN203949712U|2014-06-28|2014-11-19|宁波三峰机械电子有限公司|gasoline sensor float|
    CN104121969B|2014-08-06|2018-06-05|范序政|A kind of floating roof tank liquid level emasuring device and the measuring method using the device|US10768037B2|2017-06-12|2020-09-08|Raytheon Technologies Corporation|Oil level sensor guide|
    FR3075361B1|2017-12-19|2021-04-30|Safran Aircraft Engines|TANK WITH LIQUID LEVEL SENSOR|
    BE1026013B1|2018-02-13|2019-09-12|Safran Aero Boosters S.A.|OIL TANK WITH LEVEL SENSOR FOR TURBOMACHINE|
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    法律状态:
    2016-05-17| PLFP| Fee payment|Year of fee payment: 2 |
    2016-12-02| PLSC| Publication of the preliminary search report|Effective date: 20161202 |
    2017-04-28| PLFP| Fee payment|Year of fee payment: 3 |
    2018-04-23| PLFP| Fee payment|Year of fee payment: 4 |
    2018-09-14| CD| Change of name or company name|Owner name: SAFRAN AIRCRAFT ENGINES, FR Effective date: 20180809 |
    2019-04-19| PLFP| Fee payment|Year of fee payment: 5 |
    2020-04-22| PLFP| Fee payment|Year of fee payment: 6 |
    2021-04-21| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1554919A|FR3036792B1|2015-05-29|2015-05-29|OIL LEVEL SENSOR|FR1554919A| FR3036792B1|2015-05-29|2015-05-29|OIL LEVEL SENSOR|
    PCT/FR2016/051269| WO2016193593A1|2015-05-29|2016-05-27|Oil level sensor|
    EP16733641.1A| EP3304010B1|2015-05-29|2016-05-27|Oil level sensor|
    US15/577,235| US10436627B2|2015-05-29|2016-05-27|Oil level sensor|
    CN201680030915.4A| CN107750327B|2015-05-29|2016-05-27|Oil level sensor|
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