CN205352643U - Solenoid valve leak testing device - Google Patents

Abstract

The utility model discloses a solenoid valve leakage testing device, which relates to the field of solenoid valves. It includes inlet, air filter, pressure regulating valve, first opening valve, differential pressure sensor, pressure sensor, second opening valve, third opening valve, tested product, standard product; the inlet is directly connected to the air filter The air filter is connected with a pressure regulating valve, the pressure regulating valve is connected with the first open valve, the second open valve is connected with the differential pressure sensor in parallel and then connected with the first open valve, and the two ends of the second open valve are respectively connected with the tested product and the standard product, a third opening valve is connected between the tested product and the standard product, and the pressure sensor is installed between the second opening valve and the tested product. The beneficial effects of the utility model are: it adopts the differential pressure measurement method for testing, and when the product is tested, the low-voltage start-up test, the high-voltage start-up test, the low-pressure internal leakage test, the internal leakage test and the external leakage test are respectively carried out, and the products that pass the test are tested. Marking, high test accuracy.

Description

A solenoid valve leak test device

technical field

The utility model relates to the field of solenoid valves, in particular to a leakage test device for solenoid valves.

Background technique

Solenoid valve belongs to a kind of solenoid valve for automatic control, which is characterized in that the main valve core is designed as a self-defining valve ring consisting of a main valve ring with an inclined interface, a hollow centering linkage rod, a return spring, a spring guard rod and a conical sealing head. Self-centering sealing structure, the pilot valve core is designed as a self-centering sealing structure composed of a pilot valve ring with an inclined interface, a centering return spring, and a conical sealing head. It has the advantages of anti-seizing, temperature resistance, good sealing performance, and high operating frequency. .

The high-quality work of the solenoid valve is very important. If the solenoid valve leaks, the solenoid valve will not work well, which will affect the operation of the entire system. It is necessary to design a test device to test whether the solenoid valve is leaking.

Utility model content

The purpose of this utility model is to aim at the defects and deficiencies of the prior art, and provide a solenoid valve leakage testing device with simple structure, reasonable design and convenient use. Low-voltage start-up test, high-voltage start-up test, low-pressure internal leakage test, internal leakage test and external leakage test, mark the products that pass the test, and the test accuracy is high.

In order to solve the problems existing in the background technology, the technical solution adopted by the utility model is as follows: it includes an inlet, an air filter, a pressure regulating valve, a first opening valve, a differential pressure sensor, a pressure sensor, a second opening valve, a third Opening valve, tested product, standard product; the inlet is directly connected to the air filter, the air filter is connected to a pressure regulating valve, the pressure regulating valve is connected to the first opening valve, and the second opening valve is connected in parallel with the differential pressure sensor The first open valve and the two ends of the second open valve are respectively connected with the tested product and the standard product, and the third open valve is connected between the tested product and the standard product, and the pressure sensor is installed between the second open valve and the tested product. between.

After adopting the above structure, the beneficial effect of the utility model is: it adopts the differential pressure measurement method to test, and when the product is tested, the low-voltage start-up test, the high-pressure start-up test, the low-pressure internal leakage test, the internal leakage test and the external leakage test are respectively carried out. Mark the products that pass the test, and the test accuracy is high.

Description of drawings

Fig. 1 is a schematic diagram of the differential pressure measurement principle of the utility model.

Explanation of reference numerals: inlet 1, air filter 2, pressure regulating valve 3, first opening valve 4, differential pressure sensor 5, pressure sensor 6, second opening valve 7, third opening valve 8, product under test 9 , Standard 10.

detailed description

Below in conjunction with accompanying drawing, the utility model is described further.

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the present utility model, and are not intended to limit the present utility model.

As shown in Figure 1, this specific embodiment adopts the following technical scheme: it includes an inlet 1, an air filter 2, a pressure regulating valve 3, a first opening valve 4, a differential pressure sensor 5, a pressure sensor 6, and a second opening valve 7. The third opening valve 8, the tested product 9, and the standard product 10; the inlet 1 is directly connected to the air filter 2, the air filter 2 is connected to the pressure regulating valve 3, and the pressure regulating valve 3 is connected to the first opening valve 4. The second opening valve 7 is connected in parallel with the differential pressure sensor 5 and then connected to the first opening valve 4. The two ends of the second opening valve 7 are respectively connected with the tested product 9 and the standard product 10, and between the tested product 9 and the standard product 10 A third opening valve 8 is connected between them, and the pressure sensor 6 is installed between the second opening valve 7 and the tested object 9 .

The principle of differential pressure measurement is as follows. Compressed air enters from the inlet 1, passes through the air filter 2, and reaches the first opening valve 4 through the pressure regulating valve 3. The first opening valve 4 is opened, the second opening valve 7 is connected, and the third The opening valve 8 is disconnected. Pressurize the tested product 9 and the standard product 10, the pressure sensor 6 displays the inflation pressure value, close the valve and open the valve 4 first, cut off the connection between the solenoid valve chamber of the standard product 10 and the compressed air source, if the pressure sensor 6 detects If there is a large leakage in the solenoid valve, the detection will be interrupted and an alarm will be issued, and the third opening valve 8 will automatically open to exhaust, and the detection will end; Then close the second opening valve 7 to isolate the gas between the tested product 9 and the standard product 10, and measure the pressure difference between the two by the high-sensitivity differential pressure sensor 5 to determine whether the test object leaks. At the end of the test, the third opening valve 8 is opened to discharge the gas in the tester, the tested product 9 and the standard product 10 into the atmosphere.

In the differential pressure measurement circuit, the standard product 10 is a leak-free airtight cavity with the same volume as the tested product 9 . Under the action of the same air source, if there is no leakage in the tested product 9, the pressures of the two should be equal, and the pressure difference detected by the differential pressure sensor 5 is zero; if there is a leak in the tested product 9, the pressure will be Gradually decrease, the pressure difference between the two pressure chambers of the differential pressure sensor 5 is not zero, and the pressure sensor 6 outputs a voltage value, which is converted by A/D and sent to the industrial computer for processing.

During product testing, low-voltage start-up test, high-voltage start-up test, low-voltage internal leakage test, internal leakage test and external leakage test shall be carried out respectively, and the products that pass the test shall be marked.

In this specific embodiment, the differential pressure measurement method is used for testing, and the testing accuracy is high.

The above is only used to illustrate the technical solution of the utility model without limitation, other modifications or equivalent replacements made by those skilled in the art to the technical solution of the utility model, as long as they do not depart from the spirit and scope of the technical solution of the utility model , should be covered in the scope of the claims of the present utility model.

Claims (1)

1. A solenoid valve leakage test device is characterized in that it comprises an inlet (1), an air filter (2), a pressure regulating valve (3), a first opening valve (4), a differential pressure sensor (5), a pressure sensor (6), second opening valve (7), third opening valve (8), tested product (9), standard product (10); the inlet (1) is directly connected to the air filter (2), The air filter (2) is connected with a pressure regulating valve (3), and the pressure regulating valve (3) is connected with the first opening valve (4), and the second opening valve (7) is connected in parallel with the differential pressure sensor (5) and then connected with the first Open the valve (4), the two ends of the second opening valve (7) are respectively connected with the tested product (9) and the standard product (10), between the tested product (9) and the standard product (10) is connected with a third The valve (8) is opened, and the pressure sensor (6) is installed between the second opening valve (7) and the tested product (9).