Automatic monitoring device for pressure relief valve for transformer

Abstract

The utility model relates to an automatic monitoring device for a pressure relief valve for a transformer, which comprises a base, a valve body, a valve core and a monitoring unit, and has the technical key points that the top end of the valve core is fixedly connected with a horizontal cover plate positioned on the outer side of the valve body, an expanding mounting cavity is arranged in the valve body, and a positioning disc and a return spring are sleeved outside the valve core; the reset spring is connected between the positioning disc and the bottom surface of the expanding mounting cavity; the monitoring unit comprises a first camera assembly fixed to the side wall of the expanding installation cavity, a second camera assembly fixed to the edge of the horizontal cover plate, a distance measuring sensor fixed to the edge of the upper surface of the base and an induction piece connected with the horizontal cover plate and corresponding to the distance measuring sensor, and the top face of the first camera assembly faces the reset spring. The device can monitor the use state of the spring in the valve, whether the opening and closing and the opening amplitude of the pressure relief valve are normal or not and whether the pressure relief valve leaks oil or not in real time, timely alarm and timely processing are facilitated, and normal and safe operation of the transformer is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary equipment for transformers, in particular to an automatic monitoring device for a pressure relief valve for transformers. Background Art

[0002] At present, oil-immersed transformers still play an important role in power transmission and distribution and are widely used. In daily use, oil-immersed transformers may be affected by various environmental factors and cause failures, which will affect the power supply reliability and operation stability of the power system. When a fault occurs inside the transformer tank, the oil in the tank is decomposed and gasified, producing a large amount of gas, and the pressure in the tank rises sharply. If this pressure is not released in time, it will cause the transformer tank to deform or even burst. Installing a pressure relief valve can make the pressure relief valve open quickly within 2ms when the transformer fails inside the tank and the pressure rises to the opening pressure of the pressure relief valve, so that the pressure in the transformer tank is quickly reduced. When the pressure drops to the closing pressure value, the pressure relief valve will be reliably closed, so that the transformer tank always maintains a positive pressure, effectively preventing external air, moisture and other impurities from entering the tank. It can be seen that the pressure relief valve is very important, and monitoring of the pressure relief valve is also very necessary.

[0003] Normally, the staff judges whether the pressure relief valve is open based on the pressure gauge, but there are the following problems: 1. It cannot monitor the use status of the key component such as the spring in the pressure relief valve in real time, and it does not have a pre-warning function; 2. When the oil level of the transformer is too high, oil will leak from the pressure relief valve, and it does not have a reminder function. In the long run, it will affect the safe operation of the transformer. Utility Model Content

[0004] The purpose of the utility model is to provide a transformer pressure relief valve automatic monitoring device with a reasonable structure and reliable use to solve the above-mentioned problems. The device can monitor the use status of the spring in the valve in real time, and can also monitor whether the opening and closing and opening amplitude of the pressure relief valve are normal. At the same time, it can monitor whether the pressure relief valve has oil leakage, which is conducive to timely alarm and timely processing, and ensure the normal and safe operation of the transformer.

[0005] The technical solution of the utility model is:

[0006] A transformer pressure relief valve automatic monitoring device comprises a base, a valve body, a valve core and a monitoring unit, wherein the valve body is provided with a longitudinal sliding cavity corresponding to the valve core, and the technical key points are as follows: the top end of the valve core is connected and fixed to a horizontal cover plate located outside the valve body, an expanded diameter installation cavity connected to the longitudinal sliding cavity is provided inside the valve body, a positioning plate and a reset spring are sleeved on the outside of the valve core, the reset spring is connected between the positioning plate and the bottom surface of the expanded diameter installation cavity, the monitoring unit comprises a first camera assembly fixed on the side wall of the expanded diameter installation cavity, a second camera assembly fixed on the edge of the horizontal cover plate, a distance measuring sensor fixed on the edge of the upper surface of the base, and an induction member connected to the horizontal cover plate and corresponding to the distance measuring sensor, the top surface of the first camera assembly faces the reset spring, and the top surface of the second camera assembly faces downward.

[0007] In the above-mentioned automatic monitoring device for the pressure relief valve for the transformer, the valve body is symmetrically provided with two radial mounting holes at the position corresponding to the expanded diameter mounting cavity, the number of the first camera assemblies is two, corresponding one to one to the radial mounting holes, the front part of the lens barrel of the first camera assembly is threadedly connected to the radial mounting holes, an expanded diameter ring plate is provided on the outer wall of the lens barrel of the first camera assembly, and a sealing ring is provided on the end face of the expanded diameter ring plate, which is tightly connected to the outer wall of the valve body.

[0008] In the above-mentioned automatic monitoring device for the pressure relief valve of the transformer, the horizontal cover plate is symmetrically provided with two longitudinal mounting holes, the number of the second camera assemblies is two, corresponding one to one to the longitudinal mounting holes, and the front part of the lens barrel of the second camera assembly is threadedly connected to the longitudinal mounting hole.

[0009] In the above-mentioned automatic monitoring device for the pressure relief valve of the transformer, the sensing part is a right-angle plate, the distance sensor is fixed to the base by means of a Z-shaped bracket, the upper horizontal plane of the Z-shaped bracket is provided with a fixing hole corresponding to the distance sensor, and the lower horizontal plane is connected and fixed to the base by means of a rotating shaft, and the measuring port of the distance sensor faces upward and corresponds to the horizontal section of the right-angle plate.

[0010] The above-mentioned automatic monitoring device for the pressure relief valve for transformers, the upper side wall of the valve body is provided with a plurality of large radial through holes, the valve core is cylindrical and has a plurality of small radial through holes on its upper part, the inner wall of the longitudinal sliding cavity of the valve body is provided with a first sealing ring located at the upper part of the large radial through holes, and a second sealing ring located at the lower part of the large radial through holes, the lower part of the valve core is located in the central hole of the base, and the inner wall of the central hole is provided with a third sealing ring that cooperates with the valve core.

[0011] The above-mentioned automatic monitoring device for the pressure relief valve for transformers has a T-shaped base, a lower portion of which is provided with an external thread for connection with the transformer oil tank, an upper surface of the base is provided with a concentric positioning groove, and the lower end surface of the valve body is provided with a positioning convex ring that cooperates with the concentric positioning groove. The lower end surface of the valve body is connected and fixed to the base by a bolt pair, and the base and the valve body are buckled to form an expanded diameter installation cavity.

[0012] The beneficial effects of the utility model are:

[0013] 1. The first camera assembly is used to monitor the use status of the reset spring in the valve body, that is, the telescopic status, in real time. When the telescopic status of the reset spring is abnormal, an advance alarm is obtained, which is conducive to timely maintenance and repair.

[0014] 2. By using a distance measuring sensor and a sensing element to measure the working displacement of the valve core, it is possible to monitor whether the opening and closing and opening amplitude of the pressure relief valve are normal. If the pressure gauge shows that the pressure is too high and the working displacement of the valve core is asymmetrical, an alarm signal will be issued, which is conducive to timely maintenance and repair.

[0015] 3. Use the second camera component to monitor the pressure relief valve in real time to see if there is oil leakage, which is conducive to timely alarm and timely processing to ensure the normal and safe operation of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is another working state schematic diagram of the utility model.

[0018] In the figure: 1. sensing part, 2. second camera assembly, 3. horizontal cover plate, 4. valve core, 5. first sealing ring, 6. large radial through hole, 7. second sealing ring, 8. valve body, 9. first camera assembly, 10. base, 11. transformer oil tank, 12. positioning convex ring, 13. third sealing ring, 14. Z-shaped bracket, 15. distance sensor, 16. reset spring, 17. positioning plate, 18. enlarged diameter mounting cavity, 19. small radial through hole. DETAILED DESCRIPTION

[0019] The utility model is described in detail according to the accompanying drawings of the specification.

[0020] like Figure 1 , Figure 2As shown, the automatic monitoring device for the pressure relief valve for transformers comprises a base 10, a valve body 8, a valve core 4 and a monitoring unit. The valve body 8 is provided with a longitudinal sliding cavity corresponding to the valve core 4, the top end of the valve core 4 is connected and fixed to the horizontal cover plate 3 located outside the valve body 8, the valve body 8 is provided with an enlarged diameter installation cavity 18 communicating with the longitudinal sliding cavity, the valve core 4 is covered with a positioning plate 17 and a reset spring 16, and the reset spring 16 is connected between the positioning plate 17 and the bottom surface of the enlarged diameter installation cavity 18.

[0021] The monitoring unit includes a first camera assembly 9 fixed on the side wall of the enlarged diameter installation cavity 18, a second camera assembly 2 fixed on the edge of the horizontal cover plate 3, a distance sensor 15 fixed on the edge of the upper surface of the base 10, and a sensing element 1 connected to the horizontal cover plate 3 and corresponding to the distance sensor 15. The top surface of the first camera assembly 9 faces the reset spring 16, and the top surface of the second camera assembly 2 faces downward. In this embodiment, the valve body 8 is symmetrically provided with two radial mounting holes corresponding to the position of the enlarged diameter installation cavity 18. The number of the first camera assembly 9 is two, which corresponds to the radial mounting holes one by one. The front part of the lens barrel of the first camera assembly 9 is threadedly connected to the radial mounting holes. The outer wall of the lens barrel of the first camera assembly 9 is provided with an enlarged diameter ring plate, and the end surface of the enlarged diameter ring plate is provided with a sealing ring that is tightly connected to the outer wall of the valve body 8. The horizontal cover plate 3 is symmetrically provided with two longitudinal mounting holes. The number of the second camera assembly 2 is two, which corresponds to the longitudinal mounting holes one by one. The front part of the lens barrel of the second camera assembly 2 is threadedly connected to the longitudinal mounting hole. The sensing component 1 is a right-angle plate, and the distance sensor 15 is fixed to the base 10 by means of a Z-shaped bracket 14. The upper horizontal surface of the Z-shaped bracket 14 is provided with a fixing hole corresponding to the distance sensor 15, and the lower horizontal surface is connected and fixed to the base 10 by means of a rotating shaft. The measuring port of the distance sensor 15 faces upward and corresponds to the horizontal section of the right-angle plate.

[0022] In this embodiment, the upper side wall of the valve body 8 is provided with a plurality of large radial through holes 6, the valve core 4 is cylindrical and has a plurality of small radial through holes 19 on its upper part, the inner wall of the longitudinal sliding cavity of the valve body 8 is provided with a first sealing ring 5 located at the upper part of the large radial through hole 6, and a second sealing ring 7 located at the lower part of the large radial through hole 6, the lower part of the valve core 4 is located in the central hole of the base 10, and the inner wall of the central hole is provided with a third sealing ring 13 that cooperates with the valve core 4. The base 10 is T-shaped, and its lower part is provided with an external thread for connecting with the transformer oil tank 11, and the upper surface of the base 10 is provided with a concentric positioning groove, and the lower end surface of the valve body 8 is provided with a positioning convex ring 12 that cooperates with the concentric positioning groove, and the lower end surface of the valve body 8 is connected and fixed to the base 10 by a bolt pair, and the base 10 and the valve body 8 are buckled to form an enlarged diameter installation cavity 18.

[0023] Working principle:

[0024] After the internal pressure of the transformer oil tank 11 increases suddenly, the pressure gauge transmits a signal to the remote monitoring center. Under normal circumstances, at the same time, the valve core 4 of the pressure relief valve rises, and the small radial through hole 19 communicates with the corresponding large radial through hole 6 to release the pressure. The utility model detects the use status of the pressure relief valve in real time before and after the pressure relief valve is released. It uses the first camera component 9 to monitor the use status of the reset spring 16 in the valve body in real time, that is, the telescopic state. When the telescopic state of the reset spring 16 is abnormal, a pre-alarm is obtained, which is conducive to timely maintenance and repair; the distance sensor 15 and the induction component 1 are used to measure the working displacement of the valve core 4, and it can be monitored whether the opening and closing and opening amplitude of the pressure relief valve are normal. If the pressure gauge shows that the pressure is too high and the working displacement of the valve core 4 is asymmetric, an alarm signal is issued, which is conducive to timely maintenance and repair; the second camera component 2 is used to monitor whether the pressure relief valve has oil leakage in real time, which is conducive to timely alarm and timely processing to ensure the normal and safe operation of the transformer.

[0025] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. An automatic monitoring device for a pressure relief valve for a transformer, comprising a base, a valve body, a valve core and a monitoring unit, wherein the valve body is provided with a longitudinal sliding cavity corresponding to the valve core, and characterized in that: The top end of the valve core is connected and fixed to a horizontal cover plate located on the outside of the valve body; an expanded diameter installation cavity connected to the longitudinal sliding cavity is provided inside the valve body; a positioning plate and a reset spring are sleeved on the outside of the valve core; the reset spring is connected between the positioning plate and the bottom surface of the expanded diameter installation cavity; the monitoring unit includes a first camera assembly fixed on the side wall of the expanded diameter installation cavity, a second camera assembly fixed on the edge of the horizontal cover plate, a ranging sensor fixed on the edge of the upper surface of the base, and a sensing member connected to the horizontal cover plate and corresponding to the ranging sensor; the top surface of the first camera assembly faces the reset spring, and the top surface of the second camera assembly faces downward.

2. The automatic monitoring device for transformer pressure relief valve according to claim 1 is characterized in that: The valve body is symmetrically provided with two radial mounting holes at positions corresponding to the expanded diameter mounting cavity. The number of the first camera assemblies is two, corresponding one to one to the radial mounting holes. The front part of the lens barrel of the first camera assembly is threadedly connected to the radial mounting holes. An expanded diameter ring plate is provided on the outer wall of the lens barrel of the first camera assembly. A sealing ring is provided on the end face of the expanded diameter ring plate, which is tightly connected to the outer wall of the valve body.

3. The automatic monitoring device for transformer pressure relief valve according to claim 1 is characterized in that: The horizontal cover plate is symmetrically provided with two longitudinal mounting holes, the number of the second camera assemblies is two, corresponding one to one to the longitudinal mounting holes, and the front part of the lens barrel of the second camera assembly is threadedly connected to the longitudinal mounting hole.

4. The automatic monitoring device for transformer pressure relief valve according to claim 1 is characterized in that: The sensing component is a right-angle plate, and the distance sensor is fixed to the base by a Z-shaped bracket. The upper horizontal surface of the Z-shaped bracket is provided with a fixing hole corresponding to the distance sensor, and the lower horizontal surface is connected and fixed to the base by a rotating shaft. The measuring port of the distance sensor faces upward and corresponds to the horizontal section of the right-angle plate.

5. The automatic monitoring device for transformer pressure relief valve according to claim 1 is characterized in that: The upper side wall of the valve body is provided with a plurality of large radial through holes, the valve core is cylindrical and has a plurality of small radial through holes on its upper part, the inner wall of the longitudinal sliding cavity of the valve body is provided with a first sealing ring located at the upper part of the large radial through holes, and a second sealing ring located at the lower part of the large radial through holes, the lower part of the valve core is located in the central hole of the base, and the inner wall of the central hole is provided with a third sealing ring that cooperates with the valve core.

6. The automatic monitoring device for transformer pressure relief valve according to claim 1 is characterized in that: The base is T-shaped, and its lower part is provided with an external thread for connecting to the transformer oil tank. The upper surface of the base is provided with a concentric positioning groove. The lower end surface of the valve body is provided with a positioning convex ring that cooperates with the concentric positioning groove. The lower end surface of the valve body is connected and fixed to the base by a bolt pair, and the base and the valve body are buckled to form an expanded diameter installation cavity.

Images