Performance testing device for electronic expansion valve

Abstract

The electronic expansion valve performance testing device mainly comprises an air cylinder, a first air inlet path, a second air inlet path, a third air inlet path, an electronic expansion valve, a first air outlet path, a second air outlet path and a third air outlet path. The first air inlet path, the second air inlet path and the third air inlet path are connected with a connector A of the electronic expansion valve; and the first gas outlet path, the second gas outlet path and the third gas outlet path are connected with a port B of the electronic expansion valve. And the performance testing device is controlled by a PLC (Programmable Logic Controller). The performance testing device of the electronic expansion valve is compact in structure, can test various performances through one-time clamping, and can be widely applied to performance testing of various electronic expansion valves.

Description

Technical Field

[0001] The utility model relates to a performance testing device for an electronic expansion valve, belongs to the technical field of electronic expansion valve throttling in a vapor compression refrigeration system, and is suitable for performance testing of various electronic expansion valves. Background Art

[0002] As a key component in the automotive air-conditioning system, the electronic expansion valve plays a role in controlling the flow of the automotive air-conditioning system and maintaining an appropriate superheat. The quality of its performance directly affects the refrigeration performance of the air-conditioning system.

[0003] The size of the valve opening pulse of the electronic expansion valve directly affects the cooling performance of the automobile air conditioner. The size of the valve port leakage flow of the electronic expansion valve will affect the stability of the automobile air conditioning system. The flow rate at each pulse point of the electronic expansion valve directly affects the size of the flow rate of the automobile air conditioning system, affecting the cooling performance of the automobile air conditioner and the stability of the entire system. The ability of the electronic expansion valve to open the valve under high pressure directly affects whether the electronic expansion valve can open normally under load. At present, the valve opening pulse, valve port leakage and flow rate at each pulse point of the electronic expansion valve need to be tested separately. Existing electronic expansion valve valve opening pulse and valve port leakage test devices such as Figure 1 As shown, it mainly consists of a pressure regulating valve 1, a P pressure gauge 2, an electronic expansion valve 3, and a small flow meter 4. The valve port leakage and valve opening pulse test process: Use the pressure regulating valve 1 to adjust the P pressure gauge 2 to 1.03±0.05MPa, closing the electronic expansion valve 3. The flow rate indicated by the small flow meter 4 is the valve port leakage. The electronic expansion valve 3 is rotated until the valve port flow rate reaches the specified flow point. This pulse point is set as the valve opening point.

[0004] The existing electronic expansion valve pulse point flow and load opening capacity test device is as follows Figure 2As shown, it mainly consists of a medium-pressure regulating valve 1, a P1 pressure gauge 2, a first solenoid valve 3, a high-pressure regulating valve 4, a P2 pressure gauge 5, a second solenoid valve 6, an electronic expansion valve 7, a third solenoid valve 8, a medium flow meter 9, a fourth solenoid valve 10, and a large flow meter 11. The flow rate test process at each pulse point is as follows: Use the medium-pressure regulating valve 1 to adjust the P1 pressure gauge 2 to 1.03MPa, open the first solenoid valve 3, open the third solenoid valve 8, and open the electronic expansion valve 7 to each set pulse point to test its flow rate. The maximum flow rate tested is 150L / min. The value displayed on the medium flow meter 9 is the flow value at the pulse point. If the flow rate at the valve opening point is greater than 150L / min, close the third solenoid valve 8, open the fourth solenoid valve 10, and the value displayed on the large flow meter 11 is the flow value at the pulse point. High-pressure valve opening capacity test process: take a pulse point and use the medium-pressure regulating valve 1 to adjust the P1 pressure gauge 2 to 2.5MPa, open the first solenoid valve 3, open the electronic expansion valve 7 to the set pulse point, open the third solenoid valve 8, and the flow value displayed on the medium flow meter 9 is the no-load value. Close the first solenoid valve 3, close the electronic expansion valve 7, close the third solenoid valve 8, and use the high-pressure regulating valve 4 to adjust the P2 pressure gauge 5 to 4.5MPa, open the second solenoid valve 6, so that the load pressure in the pipeline is 4.5MPa, close the second solenoid valve 6, and use the medium-pressure regulating valve to adjust the P1 pressure gauge 2 to 2.5MPa, open the first solenoid valve 3, open the electronic expansion valve 7 to the set pulse point, open the third solenoid valve 8, and the flow value displayed on the medium flow meter 9 is the load value. Compare the no-load and load flow rates. If the flow difference is within the required range, the valve opening capacity is normal.

[0005] Since the existing electronic expansion valve testing method requires testing the electronic expansion valve opening pulse, valve port leakage, flow at each pulse point, and load-opening valve capacity separately, the existing electronic expansion valve performance testing process is complex and the test efficiency is low, which cannot meet the requirements of mass production. Summary of the Invention

[0006] The purpose of the performance testing device for an electronic expansion valve described in the present invention is to solve the above-mentioned problems and shortcomings, and to provide a new type of performance testing device for an electronic expansion valve, which has a compact structure, can test multiple performances in one clamping, and can be widely used in various electronic expansion valve performance tests.

[0007] The performance test device of the electronic expansion valve of the utility model mainly includes an air storage cylinder 1, a first air inlet path 2, a second air inlet path 3, a third air inlet path 4, an electronic expansion valve 5, a first air outlet path 6, a second air outlet path 7 and a third air outlet path 8, and is characterized in that: the first air inlet path 2 is composed of a low-pressure regulating valve 9, a P1 pressure gauge 10 and a first solenoid valve 11; the second air inlet path 3 is composed of a medium-pressure regulating valve 12, a P2 pressure gauge 13 and a second solenoid valve 14; the third air inlet path 4 is composed of a high-pressure regulating valve 15, a P3 pressure gauge 16 and a third solenoid valve The first air outlet path 6 is composed of a fourth solenoid valve 18, a small flowmeter 19 and a fifth solenoid valve 20; the second air outlet path 7 is composed of a sixth solenoid valve 21, a medium flowmeter 22 and a seventh solenoid valve 23; the third air outlet path 8 is composed of an eighth solenoid valve 24, a large flowmeter 25 and a ninth solenoid valve 26; the first air inlet path 2, the second air inlet path 3 and the third air inlet path 4 are connected to the A interface of the electronic expansion valve 5; the first air outlet path 6, the second air outlet path 7 and the third air outlet path 8 are connected to the B interface of the electronic expansion valve 5.

[0008] The utility model also includes the following additional technical features:

[0009] The performance testing device is controlled by PLC and all performance tests can be completed in one start.

[0010] All of the solenoid valves are normally closed solenoid valves.

[0011] The first air inlet 2, second air inlet 3, third air inlet 4, first air outlet 6, second air outlet 7, and third air outlet 8 of the utility model can realize the test switching between various performances of the electronic expansion valve. When switching to the first air inlet 2 and the first air outlet 6, the valve port leakage test and valve opening pulse test of the electronic expansion valve can be realized. When switching to the low-pressure gas in the first air inlet 2, the medium-pressure gas in the second air inlet 3, and the second air outlet 7 and the third air outlet 8, the flow rate of each pulse point of the electronic expansion valve can be tested. When switching to the medium-pressure gas in the second air inlet 3, the high-pressure gas in the third air inlet 4, and the second air outlet 7, the load-opening valve capability test can be realized.

[0012] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a known device for testing valve opening pulse and valve port leakage of an electronic expansion valve;

[0014] 1-pressure regulating valve, 2-P pressure gauge, 3-electronic expansion valve, 4-small flow meter

[0015] Figure 2 A schematic diagram of a known device for testing the pulse point flow rate and load-opening capability of an electronic expansion valve is shown;

[0016] 1-Medium pressure regulating valve, 2-P1 pressure gauge, 3-First solenoid valve, 4-High pressure regulating valve, 5-P2 pressure gauge, 6-Second solenoid valve, 7-Electronic expansion valve, 8-Third solenoid valve, 9-Medium flow meter, 10-Fourth solenoid valve, 11-Large flow meter

[0017] Figure 3 This is a schematic diagram of the electronic expansion valve performance testing device of the present utility model;

[0018] 1-air cylinder, 2-first air inlet path, 3-second air inlet path, 4-third air inlet path, 5-electronic expansion valve, 6-first air outlet path, 7-second air outlet path, 8-third air outlet path, 9-low-pressure regulating valve, 10-P1 pressure gauge, 11-first solenoid valve, 12-medium-pressure regulating valve, 13-P2 pressure gauge, 14-second solenoid valve, 15-high-pressure regulating valve, 16-P3 pressure gauge, 17-third solenoid valve, 18-fourth solenoid valve, 19-small flow meter, 20-fifth solenoid valve, 21-sixth solenoid valve, 22-medium flow meter, 23-seventh solenoid valve, 24-eighth solenoid valve, 25-large flow meter, 26-ninth solenoid valve. DETAILED DESCRIPTION

[0019] like Figure 3 As shown, the performance test device of the electronic expansion valve of the utility model mainly includes an air storage cylinder 1, a first air inlet path 2, a second air inlet path 3, a third air inlet path 4, an electronic expansion valve 5, a first air outlet path 6, a second air outlet path 7 and a third air outlet path 8, characterized in that: the first air inlet path 2 is composed of a low-pressure regulating valve 9, a P1 pressure gauge 10 and a first solenoid valve 11; the second air inlet path 3 is composed of a medium-pressure regulating valve 12, a P2 pressure gauge 13 and a second solenoid valve 14; the third air inlet path 4 is composed of a high-pressure regulating valve 15, a P3 pressure gauge 16 and a first solenoid valve 17; The performance testing device consists of three solenoid valves 17; the first air outlet 6 consists of a fourth solenoid valve 18, a small flowmeter 19, and a fifth solenoid valve 20; the second air outlet 7 consists of a sixth solenoid valve 21, a medium flowmeter 22, and a seventh solenoid valve 23; and the third air outlet 8 consists of an eighth solenoid valve 24, a large flowmeter 25, and a ninth solenoid valve 26. The first, second, and third air inlet 2, 3, and 4 are connected to port A of the electronic expansion valve 5; the first, second, and third air outlets 6, 7, and 8 are connected to port B of the electronic expansion valve 5. The performance testing device is controlled by a PLC, allowing all performance tests to be completed in a single startup. All solenoid valves are normally closed.

[0020] The performance test process of the electronic expansion valve is as follows:

[0021] Turn on the equipment and install the electronic expansion valve 5 on the performance test device for the electronic expansion valve of the present invention. Use the medium-pressure regulating valve 12 to adjust the gauge pressure of the P2 pressure gauge 13 to 1.03±0.05 MPa. Open the second solenoid valve 14 to close the electronic expansion valve 5. Open the fourth and fifth solenoid valves 18 and 20. The flow rate indicated by the small flow meter 19 is the leakage rate. Rotate the electronic expansion valve 5 until the valve port flow rate reaches the specified flow point. This pulse point is set as the valve opening pulse point. Close the fourth solenoid valve 18, close the fifth solenoid valve 20, open the sixth solenoid valve 21, open the seventh solenoid valve (23), close and open the electronic expansion valve 5, make the electronic expansion valve 5 in the closed state, open the electronic expansion valve 5 to each set pulse point to test its flow rate, the maximum flow rate tested is 150L / min, the value displayed on the medium flow meter 22 is the flow rate value of the pulse point, if the valve opening point flow rate is greater than 150L / min, close the sixth solenoid valve 21, close the seventh solenoid valve 23, open the eighth solenoid valve 24, open the ninth solenoid valve 26, the value displayed on the large flow meter 25 is the flow rate value of the pulse point.

[0022] To test a flow rate with a pressure less than 1 MPa, perform the following steps: Turn on the equipment, install the electronic expansion valve 5 on the electronic expansion valve performance measurement device of the present invention, adjust the gauge pressure of the P2 pressure gauge 13 to 1.03 ± 0.05 MPa using the medium-pressure regulating valve 12, open the second solenoid valve 14, and close the electronic expansion valve 5. Open the fourth and fifth solenoid valves 18 and 20, and the flow rate indicated by the small flow meter 19 is the leakage rate. Rotate the electronic expansion valve 5 until the valve port flow rate reaches the specified flow point. This pulse point is set as the valve opening pulse point. Close the second solenoid valve 14, close the fourth solenoid valve 18, close the fifth solenoid valve 20, adjust the P1 pressure gauge to the required pressure value using the low-pressure regulating valve 9, open the first solenoid valve 11, open the sixth solenoid valve 21, open the seventh solenoid valve (23), close and open the electronic expansion valve 5, put the electronic expansion valve 5 in the closed state, open the electronic expansion valve 5 to each set pulse point to test its flow rate (maximum flow rate 150L / min), and the value displayed on the medium-pressure flowmeter 22 is the flow value at the pulse point. During the high-pressure valve opening capacity process, take a pulse point and use the medium-pressure regulating valve 12 to adjust the P2 pressure gauge 13 to 2.5 MPa. Then open the second solenoid valve 14 and the sixth solenoid valve 21 to open the electronic expansion valve 5 to the set pulse point. Then open the seventh solenoid valve 23. The flow value displayed on the medium-pressure flowmeter 22 is the no-load value. Close the second solenoid valve 14, the electronic expansion valve 5, the sixth solenoid valve 21, and the first solenoid valve 23. Use the high-pressure regulating valve 15 to adjust the P3 pressure gauge 16 to 4.5 MPa. Open the third solenoid valve 17 to make the pressure in the pipeline 4.5 MPa. Close the third solenoid valve 17. Use the medium-pressure regulating valve 12 to adjust the P2 pressure gauge 13 to 2.5 MPa. Then open the second solenoid valve 14 to open the electronic expansion valve 5 to the set pulse point. Then open the sixth solenoid valve 21 and the seventh solenoid valve 23. The flow value displayed on the medium-pressure flowmeter 22 is the loaded value. Compare the no-load and loaded flow rates. If the flow difference is within the required range, the valve opening capacity is normal.

[0023] The above examples are only used to illustrate and not to limit the technical solutions of the present invention. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A performance testing device for an electronic expansion valve, mainly comprising an air storage cylinder (1), a first air inlet path (2), a second air inlet path (3), a third air inlet path (4), an electronic expansion valve (5), a first air outlet path (6), a second air outlet path (7) and a third air outlet path (8), characterized in that: The first air inlet path (2) is composed of a low-pressure regulating valve (9), a P1 pressure gauge (10) and a first solenoid valve (11); the second air inlet path (3) is composed of a medium-pressure regulating valve (12), a P2 pressure gauge (13) and a second solenoid valve (14); the third air inlet path (4) is composed of a high-pressure regulating valve (15), a P3 pressure gauge (16) and a third solenoid valve (17); the first air outlet path (6) is composed of a fourth solenoid valve (18), a small flow meter (19) and a fifth solenoid valve (20); the second The gas outlet path (7) is composed of a sixth solenoid valve (21), a medium flow meter (22) and a seventh solenoid valve (23); the third gas outlet path (8) is composed of an eighth solenoid valve (24), a large flow meter (25) and a ninth solenoid valve (26); the first gas inlet path (2), the second gas inlet path (3) and the third gas inlet path (4) are connected to the A interface of the electronic expansion valve (5); the first gas outlet path (6), the second gas outlet path (7) and the third gas outlet path (8) are connected to the B interface of the electronic expansion valve (5).

2. The performance testing device for an electronic expansion valve according to claim 1, characterized in that: The performance testing device is controlled by PLC and all performance tests can be completed in one start.

3. The performance testing device for an electronic expansion valve according to claim 1, characterized in that: All of the solenoid valves are normally closed solenoid valves.

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