Reliability test device for electromagnetic valve of refrigeration equipment

Abstract

The invention relates to a refrigeration equipment solenoid valve reliability test device, which belongs to the technical field of solenoid valve performance detection devices and comprises a thimble valve, a controller, a gas-liquid separator, a compressor, a standard solenoid valve, a first pressure sensor, a to-be-tested solenoid valve, a second pressure sensor, an electromagnetic stop valve and an evaporator, the compressor inlet communicates with the ejector pin valve outlet, and the ejector pin valve inlet communicates with an external refrigerant. An outlet of the evaporator is communicated with an inlet of the gas-liquid separator through a connecting pipe; the controller is electrically connected with the to-be-tested solenoid valve. According to the invention, the ejector pin valve and the compressor are firstly opened, the refrigerant is introduced into the loop, and then the controller is utilized to control the on-off of the to-be-tested solenoid valve, so that the working environment of the refrigeration equipment solenoid valve can be simulated, and when the to-be-tested solenoid valve is on-off, the pressure change of the first pressure sensor and the second pressure sensor is observed; and whether the on-off performance of the to-be-tested solenoid valve is reliable can be accurately tested.

Description

Technical Field

[0001] This invention relates to the technical field of solenoid valve performance testing devices, and in particular to a reliability testing device for solenoid valves in refrigeration equipment. Background Technology

[0002] As a component of refrigeration equipment, the quality and reliability of solenoid valves directly affect the production efficiency and the pass rate of refrigerated products. Currently, manufacturers generally use flow meters to measure the performance of solenoid valves. The specific measurement method is as follows: first, the flow meter and the solenoid valve are connected in the same medium channel, and then the solenoid valve is turned on and off using a controller. The reliability of the solenoid valve's opening and closing can be judged based on the measurement values ​​on the flow meter.

[0003] However, in the above measurements, ① air often remains in the space of the flow meter or solenoid valve, which will affect the actual detection results regardless of whether the medium is gas or liquid, resulting in inaccurate measurement results; ② if only gas detection is used, the flow meter cannot clearly display due to a small amount of gas overflowing from the solenoid valve, resulting in the inability to detect slight leakage of the solenoid valve; ③ if only liquid detection is used, the cost of refrigerant is too high, resulting in high cost of solenoid valve leakage detection, which is not suitable for large-scale solenoid valve testing.

[0004] Therefore, how to design a reliability testing device for solenoid valves of refrigeration equipment that is accurate, efficient, and low-cost is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides a reliability testing device for solenoid valves in refrigeration equipment, solving the technical problems of inaccurate testing and high testing costs of existing solenoid valves.

[0006] The technical solution of this invention to solve the above-mentioned technical problems is as follows: a reliability testing device for a solenoid valve of a refrigeration equipment, comprising: a gas-liquid separator, a compressor, a standard solenoid valve, a first pressure sensor, a solenoid valve under test, a second pressure sensor, a solenoid shut-off valve, an evaporator, a needle valve, and a controller. The gas-liquid separator, the compressor, the standard solenoid valve, the first pressure sensor, the solenoid valve under test, the second pressure sensor, the solenoid shut-off valve, and the outlet and inlet of the evaporator are connected in series via connecting pipes. The inlet of the compressor is connected to the outlet of the needle valve, and the inlet of the needle valve is connected to an external refrigerant. The outlet of the evaporator is connected to the inlet of the gas-liquid separator via a connecting pipe. The controller is electrically connected to the solenoid valve under test.

[0007] The beneficial effects of this invention are as follows: A novel reliability testing device for solenoid valves in refrigeration equipment is designed. First, the needle valve and compressor are opened, and refrigerant is introduced into the circuit (a circuit consisting of a gas-liquid separator, compressor, standard solenoid valve, first pressure sensor, solenoid valve under test, second pressure sensor, solenoid shut-off valve, and evaporator). Then, the controller is used to control the on / off state of the solenoid valve under test. Since the first and second pressure sensors are connected in series upstream and downstream of the solenoid valve under test, the working environment of the solenoid valve in refrigeration equipment can be simulated. When the solenoid valve under test is on / off, the pressure changes of the first and second pressure sensors are observed, and the reliability of the on / off performance of the solenoid valve under test can be accurately measured.

[0008] Reliability testing process for solenoid valves in refrigeration equipment: S1. Open the needle valve and compressor to introduce external refrigerant into the circuit consisting of the needle valve, compressor, standard solenoid valve, first pressure sensor, solenoid valve to be tested, second pressure sensor, solenoid shut-off valve, evaporator and gas-liquid separator. S2. The controller first controls the solenoid valve under test to open. At this time, the first pressure sensor rises and the second pressure sensor remains unchanged, indicating that the solenoid valve under test is open reliably. Then the controller controls the solenoid valve under test to close. At this time, the first pressure sensor falls and the second pressure sensor rises, indicating that the solenoid valve under test is closed reliably. S3. Repeat S1 and S2 operations for 7-8 cycles to determine that the solenoid valve under test is normal.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the connecting pipe between the outlet of the electromagnetic shut-off valve and the inlet of the evaporator is a capillary tube.

[0011] The further beneficial effect of adopting the above is that by adding a capillary tube between the outlet of the solenoid shut-off valve and the inlet of the evaporator, the operating conditions of the refrigeration system can be simulated to test the solenoid shut-off valve, and the compressor can be prevented from being damaged by high-temperature refrigerant.

[0012] Furthermore, it also includes an expansion valve, wherein the electromagnetic shut-off valve, the expansion valve, and the evaporator outlet and inlet are connected in series via connecting pipes.

[0013] The further beneficial effect of adopting the above is that by adding an expansion valve between the outlet of the electromagnetic shut-off valve and the inlet of the evaporator, the working conditions of the refrigeration system can be simulated to test the electromagnetic shut-off valve, and the compressor can be prevented from being damaged by high-temperature refrigerant.

[0014] Furthermore, it also includes a vacuum system, which comprises a vacuum pump, a first vacuum shut-off valve, a second vacuum shut-off valve, and a third vacuum shut-off valve. The inlet of the first vacuum shut-off valve is connected to a connecting pipe between the outlet of the solenoid shut-off valve and the inlet of the evaporator; the inlet of the second vacuum shut-off valve is connected to a connecting pipe between the outlet of the solenoid valve under test and the inlet of the second pressure sensor; the inlet of the third vacuum shut-off valve is connected to a connecting pipe between the inlet of the solenoid valve under test and the outlet of the standard solenoid valve; and the outlets of the first, second, and third vacuum shut-off valves are connected in parallel to the inlet of the vacuum pump.

[0015] The further beneficial effects of the above approach are as follows: First, the inlet of the first vacuum shut-off valve is connected to the connecting pipe between the outlet of the solenoid shut-off valve and the inlet of the evaporator; the inlet of the second vacuum shut-off valve is connected to the connecting pipe between the outlet of the solenoid valve under test and the inlet of the second pressure sensor; and the inlet of the third vacuum shut-off valve is connected to the connecting pipe between the inlet of the solenoid valve under test and the outlet of the standard solenoid valve. Then, the outlets of the first, second, and third vacuum shut-off valves are connected in parallel to the inlet of the vacuum pump. Before testing the solenoid valve under test, the vacuum pump can be used to remove the internal gas of the needle valve, compressor, standard solenoid valve, first pressure sensor, solenoid valve under test, second pressure sensor, solenoid shut-off valve, evaporator, and gas-liquid separator, thus avoiding the influence of residual air on the test results.

[0016] Furthermore, it also includes a refrigerant recovery system, which comprises a manual needle valve, a liquid receiver, and a recovery shut-off valve. The recovery shut-off valve, the liquid receiver, and the outlet and inlet of the manual needle valve are connected in series via connecting pipes. The standard solenoid valve is a two-position three-way solenoid valve, which has an A-position inlet, an A-position outlet, a B-position inlet, and a B-position outlet. The inlet of the first pressure sensor is connected to the A-position outlet via a connecting pipe. The inlet of the recovery shut-off valve is connected to the B-position outlet via a connecting pipe. The outlet of the manual needle valve is connected to the inlet of the needle valve via a connecting pipe.

[0017] The further beneficial effect of adopting the above method is that by first connecting the inlet of the recovery shut-off valve to the outlet of position B, and then connecting the manual needle valve to the top needle valve, the remaining refrigerant in the circuit can be extracted after the solenoid valve under test has been tested, and the refrigerant can be recycled, thereby reducing the testing cost of the solenoid valve under test. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a reliability testing device for a solenoid valve in a refrigeration equipment according to the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Gas-liquid separator; 2. Compressor; 3. Standard solenoid valve; 4. First pressure sensor; 5. Solenoid valve under test; 6. Second pressure sensor; 7. Solenoid shut-off valve; 8. Evaporator; 9. Needle valve; 10. Capillary tube; 11. Vacuum pump; 12. First vacuum shut-off valve; 13. Second vacuum shut-off valve; 14. Third vacuum shut-off valve; 15. Manual needle valve; 16. Liquid storage tank; 17. Recovery shut-off valve. Detailed Implementation

[0020] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0021] like Figure 1 As shown, a reliability testing device for a solenoid valve in a refrigeration equipment includes: a gas-liquid separator 1, a compressor 2, a standard solenoid valve 3, a first pressure sensor 4, a solenoid valve under test 5, a second pressure sensor 6, a solenoid shut-off valve 7, an evaporator 8, a needle valve 9, and a controller. The outlet and inlet of the gas-liquid separator 1, compressor 2, standard solenoid valve 3, first pressure sensor 4, solenoid valve under test 5, second pressure sensor 6, solenoid shut-off valve 7, and evaporator 8 are connected in series via connecting pipes. The inlet of compressor 2 is connected to the outlet of needle valve 9, and the inlet of needle valve 9 is connected to external refrigerant. The outlet of evaporator 8 is connected to the inlet of gas-liquid separator 1 via a connecting pipe. The controller is electrically connected to the solenoid valve under test 5.

[0022] In some specific embodiments, the connecting pipe between the outlet of the electromagnetic shut-off valve 7 and the inlet of the evaporator 8 is a capillary tube 10.

[0023] In some specific embodiments, an expansion valve is also included. The outlet and inlet of the expansion valve and the evaporator 8 are connected in series via connecting pipes.

[0024] like Figure 1 As shown, in some specific embodiments, a vacuum system may also be included. The vacuum system includes a vacuum pump 11, a first vacuum shut-off valve 12, a second vacuum shut-off valve 13, and a third vacuum shut-off valve 14. The inlet of the first vacuum shut-off valve 12 is connected to the connecting pipe between the outlet of the solenoid shut-off valve 7 and the inlet of the evaporator 8. The inlet of the second vacuum shut-off valve 13 is connected to the connecting pipe between the outlet of the solenoid valve 5 under test and the inlet of the second pressure sensor 6. The inlet of the third vacuum shut-off valve 14 is connected to the connecting pipe between the inlet of the solenoid valve 5 under test and the outlet of the standard solenoid valve 3. The outlets of the first vacuum shut-off valve 12, the second vacuum shut-off valve 13, and the third vacuum shut-off valve 14 are connected in parallel at the inlet of the vacuum pump 11.

[0025] like Figure 1As shown, in some specific embodiments, a refrigerant recovery system may also be included. The refrigerant recovery system includes a manual needle valve 15, a liquid storage tank 16, and a recovery shut-off valve 17. The outlet and inlet of the recovery shut-off valve 17, the liquid storage tank 16, and the manual needle valve 15 are connected in series via connecting pipes. The standard solenoid valve 3 is a two-position three-way solenoid valve with an A-position inlet, an A-position outlet, a B-position inlet, and a B-position outlet. The inlet of the first pressure sensor 4 is connected to the A-position outlet via a connecting pipe. The inlet of the recovery shut-off valve 17 is connected to the B-position outlet via a connecting pipe. The outlet of the manual needle valve 15 is connected to the inlet of the pin valve via a connecting pipe.

[0026] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reliability testing device for solenoid valves in refrigeration equipment, characterized in that, include: Gas-liquid separator (1), compressor (2), standard solenoid valve (3), first pressure sensor (4), solenoid valve under test (5), second pressure sensor (6), solenoid shut-off valve (7), evaporator (8), pin valve (9), and controller. The gas-liquid separator (1), the compressor (2), the standard solenoid valve (3), the first pressure sensor (4), the solenoid valve to be tested (5), the second pressure sensor (6), the solenoid shut-off valve (7), and the outlet and inlet of the evaporator (8) are connected in series via connecting pipes. The inlet of the compressor (2) is connected to the outlet of the needle valve (9), and the inlet of the needle valve (9) is connected to the external refrigerant. The outlet of the evaporator (8) is connected to the inlet of the gas-liquid separator (1) via connecting pipes. The controller is electrically connected to the solenoid valve to be tested (5).

2. The solenoid valve reliability testing device for refrigeration equipment according to claim 1, characterized in that, The connecting pipe between the outlet of the electromagnetic shut-off valve (7) and the inlet of the evaporator (8) is a capillary tube (10).

3. The reliability testing device for a solenoid valve in a refrigeration equipment according to claim 1, characterized in that, It also includes an expansion valve, and the electromagnetic shut-off valve (7), the expansion valve and the outlet and inlet of the evaporator (8) are connected in series via connecting pipes.

4. The reliability testing device for a solenoid valve in a refrigeration equipment according to claim 1, characterized in that, It also includes a vacuum system, which includes a vacuum pump (11), a first vacuum shut-off valve (12), a second vacuum shut-off valve (13), and a third vacuum shut-off valve (14). The inlet of the first vacuum shut-off valve (12) is connected to the connecting pipe between the outlet of the electromagnetic shut-off valve (7) and the inlet of the evaporator (8). The inlet of the second vacuum shut-off valve (13) is connected to the connecting pipe between the outlet of the solenoid valve (5) under test and the inlet of the second pressure sensor (6). The inlet of the third vacuum shut-off valve (14) is connected to the connecting pipe between the inlet of the solenoid valve (5) under test and the outlet of the standard solenoid valve (3). The outlets of the first vacuum shut-off valve (12), the second vacuum shut-off valve (13), and the third vacuum shut-off valve (14) are connected in parallel at the inlet of the vacuum pump (11).

5. The solenoid valve reliability testing device for refrigeration equipment according to claim 1, characterized in that, It also includes a refrigerant recovery system, which includes a manual needle valve (15), a liquid storage tank (16), and a recovery shut-off valve (17). The outlet and inlet of the recovery shut-off valve (17), the liquid storage tank (16), and the manual needle valve (15) are connected in series via connecting pipes. The standard solenoid valve (3) is a two-position three-way solenoid valve, which has an A-position inlet, an A-position outlet, a B-position inlet, and a B-position outlet. The inlet of the first pressure sensor (4) is connected to the A-position outlet via a connecting pipe. The inlet of the recovery shut-off valve (17) is connected to the B-position outlet via a connecting pipe. The outlet of the manual needle valve (15) is connected to the inlet of the needle valve via a connecting pipe.

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