Displacement sensor for main distribution valve core of speed regulator

Abstract

The utility model discloses a speed regulator main distribution valve core displacement sensor which is provided with a housing assembly and an iron core assembly, a coil assembly is arranged between the iron core assembly and the housing assembly, the coil assembly is supported by a coil sleeve, the coil sleeve is provided with a coil installation position, and the coil installation position is provided with a coil. The coil assembly comprises a primary coil arranged in the middle installation position of the coil sleeve and secondary coils arranged in the installation positions on the two sides. An iron core assembly is arranged in the coil sleeve in a sleeved mode and comprises a core shaft and an iron core arranged in the middle of the core shaft in a sleeved mode. Wherein the core shaft is made of a ceramic material, the front end of the core shaft is connected with a speed regulator main distribution valve element, a plurality of annular grooves are formed in the periphery of the iron core in the axial direction at intervals, the bottom of the shell assembly is connected with the adjusting assembly, and the adjusting assembly is used for adjusting the installation position of the shell assembly; the displacement sensor provided by the utility model has the characteristics of high detection sensitivity, moisture resistance and convenient adjustment.

Description

TECHNICAL FIELD

[0001] The utility model relates to displacement sensor technical field especially relates to a governor main distribution valve core displacement sensor. BACKGROUND

[0002] The important task of the governor is to ensure the stable operation of the hydroelectric generating set under the fault state, and the main elements of the governor main distribution hydraulic control system for the hydraulic part are also gradually clear and detailed, the high-precision governor main distribution feedback signal displacement sensor can improve the dynamic and static characteristics and overall performance of the whole speed regulation system, and the stability during the equipment fault state is improved, and the unit state is maintained as much as possible. The function of the displacement sensor is to convert the linear mechanical displacement into an electrical signal, the existing displacement sensor is mostly LVDT, including a shell, a coil sleeve arranged in the shell, a plurality of coils wound on the coil sleeve, an iron core arranged in the coil sleeve, and a shaft connected with the iron core, during operation, an alternating current of a certain frequency is applied to the primary excitation coil, a certain induced voltage is generated on the two secondary induction coils, when the shaft drives the iron core to move, the induced voltage of the two secondary induction coils changes, by measuring the voltage difference between the two secondary induction coils, the position change information of the iron core can be obtained, so that the purpose of linear displacement detection is realized. The existing displacement sensor is easily affected by the use environment during use, such as electromagnetic interference, excessive humidity, inconvenient installation with the valve body, inconvenient adjustment and the like, which limits the wide application of the existing displacement sensor. Therefore, the utility model provides a new displacement sensor suitable for the governor main distribution valve core to solve the problems in the prior art. SUMMARY

[0003] The utility model provides a kind of governor main distribution valve core displacement sensor for the deficiency of prior art, using the following technical solutions.

[0004] A kind of governor main distribution valve core displacement sensor, with shell assembly and iron core assembly, the coil assembly is arranged between the iron core assembly and shell assembly, the coil assembly is supported by coil sleeve, the coil sleeve is provided with coil installation site, the coil assembly includes the primary coil of the coil sleeve middle installation site and the secondary coil of two side installation sites;The coil sleeve is internally sleeved with the iron core assembly, the iron core assembly includes shaft and the iron core of the middle part of the shaft;Wherein, the shaft is of ceramic material, the front end of the shaft is connected with governor main distribution valve core, the outer periphery of the iron core is axially spaced apart with a plurality of annular grooves, the bottom of the shell assembly is connected with the adjusting assembly, and the adjusting assembly is used to adjust the installation position of the shell assembly.

[0005] Further, the coil sleeve is made of non-metal material, a plurality of blocking rings are arranged on the coil sleeve at intervals, and mounting positions are formed between two blocking rings. The axial length of the mounting position of the primary coil is greater than the axial length of the mounting position of the secondary coil.

[0006] Further, the primary coil and the secondary coil are both made of silver-coated copper wire.

[0007] Further, the housing assembly has a housing, the housing is sleeved on the outer periphery of the coil assembly, the front end of the housing is provided with a front end cover, the rear end of the housing is provided with a rear end cover, and the front end cover and the rear end cover are both provided with sliding bearings supporting the core shaft.

[0008] Further, the front end and the rear end of the core shaft have different diameters, a shaft shoulder is formed at the diameter change, the rear end cover is provided with a spring one abutting against the tail end of the core shaft, and the front end cover is provided with a spring two abutting against the end surface of the bearing.

[0009] Further, the coil sleeve has a through hole for mounting the iron core assembly, flanges are arranged inside the front end and the rear end of the through hole, the flange at the rear end is used for abutting against the bearing, and the flange at the front end is used for abutting against the spring two.

[0010] Further, the front end cover also has a sealing assembly, the sealing assembly includes a plurality of sealing sheets arranged along the axial direction of the core shaft, the sealing sheets are made of rubber material, and the sealing sheets are in interference fit with the core shaft.

[0011] Further, the adjusting assembly includes an adjusting piece, a mounting plate and an adjusting plate, the upper part of the adjusting plate is connected with the housing, the bottom surface of the adjusting plate is slidably connected with the mounting plate through a sliding rail assembly, and the adjusting piece is used for adjusting the position of the adjusting plate relative to the mounting plate.

[0012] Further, the rear end of the mounting plate has a vertical plate one, the vertical plate one has a through hole, the rear end of the adjusting plate has a vertical plate two, the vertical plate two has a threaded hole, the adjusting piece includes a handle part and a rod part, the front section of the rod part has a thread, and the rear section is a light rod, the rear section of the adjusting piece is connected with the through hole through a deep groove ball bearing, and the front section of the adjusting piece is threadedly connected with the threaded hole.

[0013] Further, the mounting plate is mounted on the main valve body.

[0014] The displacement sensor has the advantages that the iron core assembly of the displacement sensor is designed to adopt ceramic material for the mandrel, interference caused by a traditional iron mandrel to an induction coil during work is reduced, a plurality of ring grooves are uniformly and interval arranged on the axial direction of the iron core, the secondary coil more sensitively senses coil assembly magnetic flux fluctuation caused by the position change of the iron core, and the displacement amount is more beneficial to conversion; meanwhile, a plurality of sealing sheets are arranged in the front end cover of the shell, the sealing sheets and the mandrel are in interference contact, the effect of preventing humid gas from entering the inside of the shell is achieved, and the moisture-proof capability of the displacement sensor is improved; in addition, in order to facilitate installation and adjustment of the displacement sensor on the main valve, an adjusting assembly is arranged between the shell of the sensor and the valve body, the installation plate and the adjusting plate are relatively slidably arranged, and the precise adjustment of the displacement sensor is realized; and the displacement sensor has the characteristics of high detection sensitivity, moisture-proof and convenient adjustment.

[0015] Other technical effects of the displacement sensor are further described in the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly described. Obviously, the described drawings are only a part of the embodiments of the present application, and not all the embodiments, and the person skilled in the art can obtain other design schemes and drawings according to the drawings without creative labor.

[0017] Figure 1 is a front view of the sensor of the present application;

[0018] Figure 2 is an internal structure diagram of the sensor of the present application;

[0019] Figure 3 is a schematic diagram of the overall structure of the sensor of the present application;

[0020] Figure 4 is a structure schematic diagram of the coil sleeve of the sensor of the present application;

[0021] Figure 5 is a structure schematic diagram of the iron core assembly of the sensor of the present application.

[0022] Explanation of reference signs: 100 - housing assembly; 101 - housing; 110 - front end cover; 120 - rear end cover; 130 - sealing sheet; 140 - bearing; 150 - spring one; 160 - spring two; 200 - coil assembly; 210 - primary coil; 220 - secondary coil; 300 - core assembly; 310 - core shaft; 320 - core; 400 - coil sleeve; 410 - blocking ring; 500 - adjusting assembly; 510 - adjusting piece; 520 - mounting plate; 530 - adjusting plate. DETAILED DESCRIPTION

[0023] The technical solutions of the utility model will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Therefore, based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative efforts belong to the protection scope of the utility model.

[0024] It should be noted that all the connection relations mentioned in the article do not mean that the components are directly connected, but that a better connection structure can be formed by adding or reducing connecting auxiliary parts according to the specific implementation situation; in the case of no conflict, the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other. In addition, the terms "first", "second", "upper end", "lower end", "inner end", "outer end" and the like are only used for distinction and description, and cannot be understood as indicating or implying relative importance.

[0025] A speed regulator main distribution valve core displacement sensor, as shown in Figures 1 to 5 The speed regulator main distribution valve core displacement sensor has a housing assembly 100 and a core 320 assembly, a coil assembly 200 is arranged between the housing assembly 100 and the core 320 assembly, the coil assembly 200 is supported by a coil sleeve 400, the coil sleeve 400 is provided with a coil mounting position, the coil assembly 200 comprises a primary coil 210 arranged in the middle mounting position of the coil sleeve 400 and a secondary coil 220 arranged in the two side mounting positions; the coil sleeve 400 is internally sleeved with a core assembly 300, the core assembly 300 comprises a core shaft 310 and a core 320 sleeved in the middle part of the core shaft 310; wherein the core shaft 310 is made of ceramic material, the front end of the core shaft 310 is connected with a speed regulator main distribution valve core, a plurality of ring grooves are arranged on the outer periphery of the core 320 in the axial direction, the bottom of the housing assembly 100 is connected with an adjusting assembly 500, and the adjusting assembly 500 is used for adjusting the mounting position of the housing assembly 100; the front end of the core shaft 310 has a connecting structure and can be connected with the speed regulator main distribution valve core.

[0026] Further, the coil sleeve 400 is made of non-metal material, a plurality of blocking rings 410 are arranged on the coil sleeve 400 at intervals, and mounting positions are formed between two blocking rings 410. The axial length of the mounting position of the primary coil 210 is greater than the axial length of the mounting position of the secondary coil 220, and the primary coil 210 has stronger initial magnetic flux. The iron core 320 of the core shaft assembly 300 is opposite to the primary coil 210 when the iron core 320 is at zero position, and the iron core 320 does not coincide with the secondary coil 220. The movement of the iron core 320 is induced by using the primary coil 210 and the secondary coil 220, and the specific principle will not be repeated here.

[0027] Further, the primary coil 210 and the secondary coil 220 are both made of silver-coated copper wire. The cost of silver-coated copper material is lower than that of pure silver wire, and the silver-coated copper material has better electrical conductivity than pure copper wire, so that the electromagnetic induction of the coil can be improved.

[0028] Further, the housing assembly 100 has a housing 101, the housing 101 is sleeved on the outer periphery of the coil assembly 200, the front end of the housing 101 is provided with a front end cover 110, the rear end of the housing 101 is provided with a rear end cover 120, the front end cover 110 and the rear end cover 120 are both internally provided with a sliding bearing 140 supporting the core shaft 310. This kind of bearing is mainly used to support the core shaft 310 in the radial direction, and the core shaft 310 can axially slide relative to the matching hole of the bearing 140. The bearing is mainly made of self-lubricating material and belongs to the prior art. The specific iron core assembly 300 has an anti-rotation structure (not shown in the figure), which ensures that the core shaft 310 can correctly reciprocate.

[0029] Further, the diameters of the front end and the rear end of the core shaft 310 are different, and an axial shoulder is formed at the diameter change position. The axial shoulder is used for positioning the iron core 320. The rear end cover 120 is internally provided with a spring 150 abutting against the tail end of the core shaft 310. The front end cover 110 is internally provided with a spring 160 abutting against the end face of the bearing 140.

[0030] Further, as shown in Figure 2 , Figure 4 , the coil sleeve 400 has a through hole for mounting the iron core 320 assembly. The front end and the rear end of the through hole are internally provided with flanges. The flange at the rear end is used for abutting against the bearing 140, and the flange at the front end is used for abutting against the spring 160.

[0031] Further, the front end cover 110 also has a sealing assembly. The sealing assembly includes a plurality of sealing sheets 130 arranged in the axial direction of the core shaft 310. The sealing sheets 130 are made of rubber material. The inner wall of the front end cover 110 is provided with an annular groove. The sealing sheets 130 are inserted into the annular groove. The sealing sheets 130 are in interference fit with the core shaft 310, so as to prevent dust and moisture from entering the inside of the sensor.

[0032] Further, the adjusting assembly 500 comprises an adjusting piece 510, a mounting plate 520 and an adjusting plate 530, the upper part of the adjusting plate 530 is connected with the shell 101, the bottom surface of the adjusting plate 530 is slidably connected with the mounting plate 520 through a sliding rail assembly, and the adjusting piece 510 is used for adjusting the position of the adjusting plate 530 relative to the mounting plate 520.

[0033] Further, the rear end of the mounting plate 520 is provided with a vertical plate one, the vertical plate one is provided with a through hole, the rear end of the adjusting plate 530 is provided with a vertical plate two, the vertical plate two is provided with a threaded hole, the adjusting piece 510 comprises a handle part and a rod part, the front section of the rod part is provided with a thread, and the rear section is a light rod, the rear section of the adjusting piece 510 is connected with the through hole through a deep groove ball bearing 140, and the front section of the adjusting piece 510 is threadedly connected with the threaded hole; in another mode, the adjusting piece 510 can be used for more precise adjustment by using a screw micrometer, the moving part of the screw micrometer is connected with the adjusting plate 530, and the knob part is connected with the mounting plate 520. The adjusting mode is mainly arranged for determining the "zero position" of the iron core 320 and the position without magnetic flux on the secondary coil 220, and the adjusting assembly 500 is used for high-precision and convenient adjustment.

[0034] Further, the mounting plate 520 is mounted on the main valve body, and the preliminary mounting position is adjusted, so that the end of the mandrel 310 is in contact with the end of the main valve core of the speed regulator, thereby being used for detecting the displacement of the main valve core.

[0035] The iron core assembly of the displacement sensor is designed by using ceramic material, interference brought by traditional iron mandrel during work of the induction coil is reduced, a plurality of ring grooves are uniformly and interval arranged on the axial direction of the iron core, the secondary coil more sensitively senses the coil assembly magnetic flux fluctuation caused by the change of the iron core position, and the displacement amount is more beneficial to conversion; meanwhile, a plurality of sealing sheets are arranged in the front end cover of the shell, interference contact is formed between the sealing sheets and the mandrel, the effect of preventing humid gas from entering the inside of the shell is achieved, and the moisture-proof capability of the displacement sensor is improved; in addition, in order to facilitate installation and adjustment of the displacement sensor on the main valve, the adjusting assembly is arranged between the shell of the sensor and the valve body, precise adjustment of the displacement sensor is realized by arranging the mounting plate and the adjusting plate which can slide relative to each other; the displacement sensor has the characteristics of high detection sensitivity, moisture-proof and convenient adjustment through the above effects.

[0036] It should be noted that the above embodiments are intended to illustrate the technical solutions of the present application, and are exemplary modes of the present application claims, but not a limitation of the claims. Although the above embodiments have been described in detail, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application embodiments.

Claims

1. A governor main valve spool displacement sensor having a housing assembly and a core assembly, characterized by, The coil assembly is arranged between the iron core assembly and the shell assembly, and is supported by a coil sleeve, the coil sleeve is provided with coil mounting positions, the coil assembly comprises a primary coil arranged in the middle mounting position of the coil sleeve and a secondary coil arranged in the two side mounting positions; the coil sleeve is internally sleeved with the iron core assembly, the iron core assembly comprises a core shaft and an iron core sleeved in the middle part of the core shaft; wherein the core shaft is made of ceramic material, the front end of the core shaft is connected with a speed regulator main valve core, the outer periphery of the iron core is axially spaced apart and provided with a plurality of ring grooves, the bottom of the shell assembly is connected with an adjusting assembly, and the adjusting assembly is used for adjusting the mounting position of the shell assembly.

2. The governor main valve spool displacement sensor of claim 1, wherein The coil sleeve is made of non-metallic material, a plurality of stop rings are arranged on the coil sleeve at intervals, mounting positions are formed between two stop rings, and the axial length of the mounting position of the primary coil is greater than that of the mounting position of the secondary coil.

3. The governor main valve spool displacement sensor of claim 2 wherein, The primary coil and the secondary coil are both made of silver-coated copper wire.

4. The governor main valve spool displacement sensor of claim 3 wherein, The shell assembly has a shell, the shell is sleeved on the outer periphery of the coil assembly, the front end of the shell is provided with a front end cover, the rear end of the shell is provided with a rear end cover, and the front end cover and the rear end cover are both internally provided with a sliding bearing for supporting the core shaft.

5. The governor main valve spool displacement sensor of claim 4 wherein, The front end and the rear end of the core shaft have different diameters, an axial shoulder is formed at the diameter change position, the rear end cover is internally provided with a spring one abutting against the tail end of the core shaft, and the front end cover is internally provided with a spring two abutting against the end surface of the bearing.

6. The governor main valve spool displacement sensor of claim 5 wherein, The coil sleeve has a through hole for mounting the iron core assembly, the front end and the rear end of the through hole are internally provided with flanges, the flange at the rear end is used for abutting against the bearing, and the flange at the front end is used for abutting against the spring two.

7. The governor main valve spool displacement sensor of claim 6 wherein, The front end cover also has a sealing assembly, the sealing assembly comprises a plurality of sealing sheets arranged along the axial direction of the core shaft, the sealing sheets are made of rubber material, and the sealing sheets are in interference fit with the core shaft.

8. The governor main valve spool displacement sensor of claim 1, wherein, The adjusting assembly comprises an adjusting piece, a mounting plate and an adjusting plate, the upper part of the adjusting plate is connected with the shell, the bottom surface of the adjusting plate is slidably connected with the mounting plate through a sliding rail assembly, and the adjusting piece is used for adjusting the position of the adjusting plate relative to the mounting plate.

9. The governor main valve spool displacement sensor of claim 8 wherein, The rear end of the mounting plate has a vertical plate one, the vertical plate one has a through hole, the rear end of the adjusting plate has a vertical plate two, the vertical plate two has a threaded hole, the adjusting piece comprises a handle part and a rod part, the front section of the rod part has a thread, and the rear section is a light rod, the rear section of the adjusting piece is connected with the through hole through a deep groove ball bearing, and the front section of the adjusting piece is threadedly connected with the threaded hole.

10. The governor main valve spool displacement sensor of claim 9 wherein, The mounting plate is mounted on the main valve body.

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