A miniature pressure relief valve calibrator

Abstract

The utility model relates to non - electric quantity protection subassembly check technical field, concretely relates to a kind of miniature pressure release valve check instrument, including fixing frame, and fixing frame is equipped with air pump, gas holder, intercommunication valve block;Wherein, the exhaust end of air pump is communicated with the gas inlet end of gas holder, and the exhaust end of air pump is externally connected with first solenoid valve, and the exhaust end of gas holder is connected with first pressure transmitter for monitoring the pressure of gas holder, and the exhaust end of first pressure transmitter is connected with the gas inlet end of intercommunication valve block;The exhaust end of intercommunication valve block has two exhaust ports, one exhaust port is used to externally connect the pressure release valve to be tested, and the other exhaust port is used to connect exhaust duct, and intercommunication valve block is also equipped with two control valves for controlling the opening and closing of exhaust port and second pressure transmitter for monitoring the pressure of pressure release valve;The utility model is high in integration degree on the one hand, and on the other hand, through the above-mentioned parts cooperation, the check of pressure release valve can be realized, and the unqualified pressure release valve can be avoided to be installed to transformer and put into operation.

Description

Technical Field

[0001] This utility model relates to the field of non-electrical protection component verification technology, specifically to a miniature pressure relief valve verification instrument. Background Technology

[0002] Pressure relief valves are pressure protection devices for oil-immersed power transformers. After prolonged operation, especially under harsh conditions, the internal sealing rings of pressure relief valves may become stuck or damaged, and the insulation performance of electrical switches may also decrease. If such pressure relief valves continue to operate, they are prone to leakage, false alarms, or failure to operate. Therefore, the operational reliability of pressure relief valves is directly related to the operational safety of transformers. By calibrating pressure relief valves, unqualified pressure relief valves can be prevented from being installed on transformers and put into operation, which is of great significance for the safe operation of power transformers.

[0003] To solve the above technical problems, a miniature pressure relief valve calibrator was introduced. Utility Model Content

[0004] In view of this, the present invention provides a miniature pressure relief valve calibrator, which can not only calibrate pressure relief valves, but also has a high degree of integration and is easy to use.

[0005] To solve the above technical problems, this utility model provides a miniature pressure relief valve calibrator, including a fixed frame, on which an air pump, an air storage tank, and a connecting valve block are provided;

[0006] The exhaust end of the air pump is connected to the inlet end of the air storage tank, and a first solenoid valve is externally connected to the exhaust end of the air pump. A first pressure transmitter for monitoring the pressure of the air storage tank is connected to the exhaust end of the air storage tank, and the exhaust end of the first pressure transmitter is connected to the inlet end of the connecting valve block.

[0007] The exhaust end of the connecting valve block has two exhaust ports, one of which is used to externally receive the pressure relief valve, and the other is used to connect to the exhaust pipe. The connecting valve block is also equipped with two control valves for controlling the opening and closing of the exhaust ports and a second pressure transmitter for monitoring the pressure of the pressure relief valve.

[0008] Furthermore, the air inlet end of the connecting valve block is provided with an air inlet connector, which is connected to the exhaust end of the first pressure transmitter.

[0009] Furthermore, the gas storage tank is equipped with a one-way valve at its inlet end.

[0010] Furthermore, the two exhaust ports are respectively provided with exhaust connector one and exhaust connector two. Exhaust connector one is used to externally receive the pressure relief valve, and exhaust connector two is used to connect to the exhaust pipe.

[0011] Furthermore, the two control valves include a second solenoid valve and a third solenoid valve, the second solenoid valve being connected to exhaust connector one and the third solenoid valve being connected to exhaust connector two.

[0012] Furthermore, the mounting bracket is equipped with a main control board for controlling the air pump, the first solenoid valve, the second solenoid valve, the third solenoid valve, the first pressure transmitter, and the second pressure transmitter.

[0013] Furthermore, the first pressure transmitter is a miniature pressure transmitter, and the second pressure transmitter is an absolute pressure transmitter.

[0014] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0015] 1. This utility model, by setting a fixed frame and installing an air pump, air tank, connecting valve block, first solenoid valve, second solenoid valve, third solenoid valve, first pressure transmitter, and second pressure transmitter on the fixed frame, has a high degree of integration. In addition, through the cooperation of the above components, the pressure relief valve can be verified, which can prevent unqualified pressure relief valves from being installed on transformers and put into operation.

[0016] 2. This utility model achieves modularization of components by setting a connecting valve block and installing a second solenoid valve, a third solenoid valve, and a second pressure transmitter on the connecting valve block, saving the space occupied by parts. Moreover, by setting a connecting valve block to connect the second solenoid valve, the third solenoid valve, and the second pressure transmitter, the monitoring accuracy is effectively improved compared to connecting the above components through pipelines. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the isometric structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the axial side of the connecting valve block in this utility model;

[0019] Figure 3 One of the system schematic diagrams provided for some embodiments of this utility model;

[0020] Figure 4 This is the second system schematic diagram provided for some embodiments of the present utility model.

[0021] In the diagram: 1. Mounting frame; 2. Main control board; 3. Air pump; 4. First solenoid valve; 5. Air tank; 6. First pressure transmitter; 7. Second solenoid valve; 8. Second pressure transmitter; 9. Third solenoid valve; 10. Connecting valve block; 11. Air inlet connector; 12. Exhaust connector one; 13. Exhaust connector two; 14. Check valve; 15. Pressure relief valve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the appendices of the embodiments of this utility model. Figure 1-4 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0023] Pressure relief valves are pressure protection devices used in oil-immersed power transformers. After prolonged operation, especially under harsh conditions, the internal seals of these valves may become stuck or damaged, and the insulation performance of the electrical switches may also decrease. Continued operation of such pressure relief valves can easily lead to leakage, false alarms, or failure to operate. Therefore, the operational reliability of the pressure relief valve is directly related to the operational safety of the transformer. Verifying the pressure relief valve can prevent unqualified valves from being installed and put into operation, which is of great significance for the safe operation of power transformers.

[0024] To solve the above technical problems, such as Figure 1-4 As shown: A miniature pressure relief valve calibrator is introduced, including a mounting frame 1, on which an air pump 3, an air tank 5, and a connecting valve block 10 are mounted; the mounting frame 1 is also equipped with a main control board 2 for controlling the air pump 3, the first solenoid valve 4, the second solenoid valve 7, the third solenoid valve 9, the first pressure transmitter 6, and the second pressure transmitter 8.

[0025] The exhaust end of the air pump 3 is connected to the inlet end of the air storage tank 5, and the exhaust end of the air pump 3 is externally connected to the first solenoid valve 4. When the air pump 3 stops working, the first solenoid valve 4 remains open. The exhaust end of the air storage tank 5 is connected to the first pressure transmitter 6 for monitoring the pressure of the air storage tank 5. The first pressure transmitter 6 is used to keep the pressure of the air storage tank 5 within a stable range. The exhaust end of the first pressure transmitter 6 is connected to the inlet end of the connecting valve block 10.

[0026] The exhaust end of the connecting valve block 10 has two exhaust ports, and the two exhaust ports are respectively equipped with exhaust connector 12 and exhaust connector 13. Exhaust connector 12 is used to externally receive pressure relief valve 15, and exhaust connector 13 is used to connect to the exhaust pipe. The two control valves include a second solenoid valve 7 and a third solenoid valve 9. The second solenoid valve 7 is connected to exhaust connector 12, and the third solenoid valve 9 is connected to exhaust connector 13. The connecting valve block 10 is also equipped with a second pressure transmitter 8 for monitoring the pressure of pressure relief valve 15.

[0027] The above embodiments, by setting up a fixed frame 1 and installing an air pump 3, an air tank 5, a connecting valve block 10, a first solenoid valve 4, a second solenoid valve 7, a third solenoid valve 9, a first pressure transmitter 6, and a second pressure transmitter 8 on the fixed frame 1, achieve a high degree of integration. In addition, through the cooperation of the above components, the pressure relief valve 15 can be verified, which can prevent unqualified pressure relief valves 15 from being installed on transformers and put into operation.

[0028] According to one embodiment of the present invention, such as Figure 4 As shown, the air inlet of the air tank 5 is equipped with a one-way valve 14. The one-way valve 14 is designed to prevent the gas in the air tank 5 from flowing back when the air pump 3 stops supplying gas to the air tank 5.

[0029] According to another embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the air inlet end of the connecting valve block 10 is provided with an air inlet connector 11, which is connected to the exhaust end of the first pressure transmitter 6; by setting the air inlet connector 11, it is convenient for the first pressure transmitter 6 to be quickly connected through the air pipe.

[0030] In the above embodiments, the first pressure transmitter 6 is a small pressure transmitter, specifically the CYB131 small pressure transmitter manufactured by Xi'an Xinmin Electronic Technology Co., Ltd., and the second pressure transmitter 8 is an absolute pressure transmitter.

[0031] When calibrating the pressure relief valve 15, the pressure relief valve 15 to be tested is connected to the exhaust connector 12, and the first solenoid valve 4 and the third solenoid valve 9 are kept closed. The air pump 3 is started, and the first pressure transmitter 6 monitors the internal pressure of the air tank 5. When the air tank 5 reaches a stable range, the second solenoid valve 7 is opened. At this time, the second pressure transmitter 8 collects the pressure of the pressure relief valve 15 under test. After the test is completed, the third solenoid valve 9 is opened to discharge the gas, thus completing the test calibration.

[0032] During the calibration of pressure relief valve 15, when the air tank 5 reaches the set upper pressure limit, the air pump 3 stops working and the third solenoid valve 9 opens to release the pressure of the air tank 5. When the air tank 5 reaches the set lower pressure limit, the air pump 3 starts again and the third solenoid valve 9 closes to replenish the pressure to the air tank 5, so that the pressure of the air tank 5 is maintained within the set range.

[0033] In this utility model, unless otherwise explicitly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A miniature pressure relief valve calibrator, characterized in that: Includes a mounting frame, on which an air pump, an air tank, and a connecting valve block are mounted; The exhaust end of the air pump is connected to the inlet end of the air storage tank, and a first solenoid valve is externally connected to the exhaust end of the air pump. A first pressure transmitter for monitoring the pressure of the air storage tank is connected to the exhaust end of the air storage tank, and the exhaust end of the first pressure transmitter is connected to the inlet end of the connecting valve block. The exhaust end of the connecting valve block has two exhaust ports, one of which is used to externally receive the pressure relief valve, and the other is used to connect to the exhaust pipe. The connecting valve block is also equipped with two control valves for controlling the opening and closing of the exhaust ports and a second pressure transmitter for monitoring the pressure of the pressure relief valve.

2. The miniature pressure relief valve calibrator as described in claim 1, characterized in that: The air inlet end of the connecting valve block is provided with an air inlet connector, which is connected to the exhaust end of the first pressure transmitter.

3. The miniature pressure relief valve calibrator as described in claim 1, characterized in that: The gas storage tank is equipped with a one-way valve at the gas inlet.

4. The miniature pressure relief valve calibrator as described in claim 1, characterized in that: The two exhaust ports are respectively equipped with exhaust connector one and exhaust connector two. Exhaust connector one is used to externally receive the pressure relief valve, and exhaust connector two is used to connect to the exhaust pipe.

5. The miniature pressure relief valve calibrator as described in claim 4, characterized in that: The two control valves include a second solenoid valve and a third solenoid valve, the second solenoid valve being connected to exhaust connector one and the third solenoid valve being connected to exhaust connector two.

6. The miniature pressure relief valve calibrator as described in claim 5, characterized in that: The mounting frame is equipped with a main control board for controlling the air pump, the first solenoid valve, the second solenoid valve, the third solenoid valve, the first pressure transmitter, and the second pressure transmitter.

7. The miniature pressure relief valve calibrator as described in claim 1, characterized in that: The first pressure transmitter is a small pressure transmitter, and the second pressure transmitter is an absolute pressure transmitter.

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