A test method for testing transient response characteristics of relief valve

Abstract

The present invention discloses a test method for testing the transient response characteristics of a relief valve, which belongs to the technical field of relief valves. The test method includes an oil tank, an oil source motor, an oil source pump, a hydraulically controlled pilot circuit motor, a hydraulically controlled pilot circuit pump, a one-way valve, a return oil filter, a high-pressure filter, a hydraulically controlled pilot circuit electromagnetic relief valve, a main circuit electromagnetic relief valve, a hydraulically controlled pilot circuit pressure gauge, a main circuit pressure gauge, a return oil circuit pressure gauge, a return oil circuit one-way valve, a solenoid valve, a hydraulically controlled one-way valve, a throttle valve, a flow meter, a relief valve and a pressure sensor. The present invention adopts a simple and effective method that can more accurately test the dynamic characteristics of the relief valve, thereby effectively improving the test accuracy of the test bench.

Description

Technical Field

[0001] The present invention belongs to the technical field of overflow valves, and in particular relates to a testing method for testing transient response characteristics of overflow valves. Background Art

[0002] The test of the transient response characteristics of the relief valve has always been a difficult problem. Currently, the fastest response time of the direct-acting relief valve is as fast as 2ms. The current testing technology generally uses an electromagnetic ball valve to control the on-off of the bypass circuit to achieve a step change in pressure (such as in the existing technology). Figure 1 The electromagnetic ball valve 21).

[0003] However, in the prior art, solenoid ball valves have a long response time of approximately 50ms, which is much longer than that of direct-acting relief valves. This long response time of the solenoid valve itself seriously interferes with the authenticity of the relief valve's transient response curve. To more accurately test the relief valve's transient response, a test method for testing the relief valve's transient response characteristics is needed. Summary of the Invention

[0004] An embodiment of the present invention provides a testing method for testing transient response characteristics of a relief valve to solve the problems in the prior art.

[0005] The embodiment of the present invention adopts the following technical solution: a test method for testing the transient response characteristics of a relief valve, comprising an oil tank, an oil source motor, an oil source pump, a hydraulically controlled pilot circuit motor, a hydraulically controlled pilot circuit pump, a one-way valve, a return oil filter, a high-pressure filter, a hydraulically controlled pilot circuit electromagnetic relief valve, a main circuit electromagnetic relief valve, a hydraulically controlled pilot circuit pressure gauge, a main circuit pressure gauge, a return oil circuit pressure gauge, a return oil circuit one-way valve, a solenoid valve, a hydraulically controlled one-way valve, a throttle valve, a flow meter, a relief valve and a pressure sensor, wherein the oil source pump is arranged on one side of the oil tank, the oil source motor is located on the oil source pump, the hydraulically controlled pilot circuit pump is arranged on the other side of the oil tank, and the hydraulically controlled The pilot circuit motor is located on the hydraulically controlled pilot circuit pump. There are two one-way valves, which are respectively arranged on the oil source pump and the hydraulically controlled pilot circuit pump. There are two high-pressure filters, which are respectively connected to the two one-way valves. The flowmeter is connected between the measured overflow valve and the high-pressure filter. The hydraulically controlled one-way valve is connected to the branch of the flowmeter. The solenoid valve is connected to the hydraulically controlled one-way valve. The throttle valve is connected to the branch of the flowmeter. The return oil circuit one-way valve is connected to the solenoid valve. The pressure sensor is connected to the flowmeter. Both ends of the overflow valve are connected between the return oil circuit one-way valve and the pressure sensor.

[0006] Furthermore, a main circuit pressure gauge is provided on the side of the oil source pump next to the one-way valve, a hydraulically controlled pilot circuit electromagnetic overflow valve is provided on the side of the hydraulically controlled pilot circuit pump next to the one-way valve, and the return oil circuit pressure gauge is connected to the hydraulically controlled one-way valve.

[0007] Furthermore, an air filter is provided on the fuel tank.

[0008] Furthermore, two return oil filters are provided, and a main circuit electromagnetic overflow valve is provided on the branch of the high-pressure filter. One return oil filter is connected between the main circuit electromagnetic overflow valve and the oil tank, and the other return oil filter is connected between the branch of the throttle valve and the oil tank.

[0009] Furthermore, a hydraulically controlled pilot circuit electromagnetic overflow valve is connected to the side of the hydraulically controlled pilot circuit pressure gauge.

[0010] The at least one technical solution adopted in the embodiment of the present invention can achieve the following beneficial effects:

[0011] Firstly, compared with the prior art, the present invention adopts a simple and effective method that can more accurately test the dynamic characteristics of the overflow valve, thereby effectively improving the test accuracy of the test bench.

[0012] Secondly, the present invention utilizes the short response time of the hydraulically controlled one-way valve to more accurately test the transient response characteristics of the relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0014] Figure 1 It is a schematic diagram of the prior art;

[0015] Figure 2 It is a structural schematic diagram of the present invention;

[0016] Attached photos

[0017] Oil tank 1, oil source motor 2, oil source pump 3, hydraulic control pilot circuit motor 4, hydraulic control pilot circuit pump 5, check valve 6, return oil filter 7, high-pressure filter 8, hydraulic control pilot circuit solenoid overflow valve 9, main circuit solenoid overflow valve 10, hydraulic control pilot circuit pressure gauge 11, main circuit pressure gauge 12, return oil line pressure gauge 13, return oil line check valve 14, solenoid valve 15, hydraulic control check valve 16, throttle valve 17, flow meter 18, air filter 19, overflow valve 20, pressure sensor 21. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] The technical solutions provided by various embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] Reference Figures 1 to 2 As shown, the embodiment of the present invention provides a test method for testing the transient response characteristics of a relief valve, comprising an oil tank 1, an oil source motor 2, an oil source pump 3, a hydraulically controlled pilot circuit motor 4, a hydraulically controlled pilot circuit pump 5, a one-way valve 6, a return oil filter 7, a high-pressure filter 8, a hydraulically controlled pilot circuit electromagnetic relief valve 9, a main circuit electromagnetic relief valve 10, a hydraulically controlled pilot circuit pressure gauge 11, a main circuit pressure gauge 12, a return oil circuit pressure gauge 13, a return oil circuit one-way valve 14, a solenoid valve 15, a hydraulically controlled one-way valve 16, a throttle valve Valve 17, flow meter 18, overflow valve 20 and pressure sensor 21, the oil source pump 3 is arranged on one side of the oil tank 1, the oil source motor 2 is located on the oil source pump 3, the hydraulic pilot circuit pump 5 is arranged on the other side of the oil tank 1, the hydraulic pilot circuit motor 4 is located on the hydraulic pilot circuit pump 5, and there are two one-way valves 6, which are respectively arranged on the oil source pump 3 and the hydraulic pilot circuit pump 5. The one-way valve 6 can realize the on-off of the oil circuit and will not cause the return of the oil circuit when in use. Flow affects subsequent testing operations. Two high-pressure filters 8 are provided, and the two high-pressure filters 8 are respectively connected to two one-way valves 6. The high-pressure filter 8 can filter the oil sucked from the oil tank 1 and filter out impurities to ensure subsequent use. The flowmeter 18 is connected between the relief valve 20 to be tested and the high-pressure filter 8. The flowmeter 18 can monitor the flow flowing to the relief valve 20. The hydraulically controlled one-way valve 16 is connected to the branch of the flowmeter 18. The solenoid valve 15 is connected to the hydraulically controlled one-way valve 16. The solenoid valve 15 is replaced with other on-off valves such as reversing valves, solenoid ball valves, and manual ball valves. The throttle valve 17 is connected to the branch of the flowmeter 18. The return oil circuit one-way valve 14 is connected to the solenoid valve 15. The pressure sensor 21 is connected to the flowmeter 18. The two ends of the relief valve 20 are connected between the return oil circuit one-way valve 14 and the pressure sensor 21. By collecting the feedback of the data of the pressure sensor 21 and analyzing it, the transient characteristic curve of the relief valve 20 can be obtained.

[0021] Specifically, a main circuit pressure gauge 12 is provided on the side of the oil source pump 3 next to the one-way valve 6, which can monitor the pressure in the oil circuit. A hydraulically controlled pilot circuit electromagnetic overflow valve 9 is provided on the side of the hydraulically controlled pilot circuit pump 5 next to the one-way valve 6. The return oil circuit pressure gauge 13 is connected to the hydraulically controlled one-way valve 16, which can monitor the pressure of the oil circuit during oil return in real time.

[0022] Specifically, an air filter 19 is provided on the oil tank 1. The air filter 19 can keep the oil in the oil tank 1 clean.

[0023] Specifically, two return oil filters 7 are provided. A main circuit electromagnetic overflow valve 10 is provided on the branch line of the high-pressure filter 8. One return oil filter 7 is connected between the main circuit electromagnetic overflow valve 10 and the fuel tank 1, and the other return oil filter 7 is connected between the branch line of the throttle valve 17 and the fuel tank 1. The return oil filter 7 can filter the oil returning to the fuel tank 1 and intercept impurities in the oil to ensure the cleanliness of the return oil circuit.

[0024] Specifically, a hydraulically controlled pilot circuit electromagnetic overflow valve 9 is connected to the side of the hydraulically controlled pilot circuit pressure gauge 11 .

[0025] The working principle of the present invention: When in use, the relief valve 20 serves as the valve being tested, the oil source pump 3 supplies oil to the relief valve 20, and the main circuit electromagnetic relief valve 10 serves as a safety valve. The hydraulically controlled pilot circuit pump 5 supplies oil to the pilot ports of the hydraulically controlled check valve 16 and the relief valve 20. When testing the opening pressure of the relief valve 20, the electromagnetic valve 15 is de-energized. The outlet pressure of the oil source pump 3 is regulated by adjusting the opening of the throttle valve 17. When flow is flowing through the flowmeter 18, the system pressure detected by the pressure sensor 21 is the opening pressure of the relief valve 20. When testing the transient response characteristics of the test valve, the throttle valve 17 is completely closed, the solenoid valve 15 is de-energized, the hydraulic pilot circuit pump 5 is turned on and adjusted to the set pressure, and the system pressure is controlled by adjusting the relief valve 20. By suddenly energizing the solenoid valve 15, the hydraulically controlled one-way valve 16 is opened. At this time, part of the outlet flow of the oil source pump 3 returns to the oil tank 1 through the hydraulically controlled one-way valve 16, and the system pressure drops instantly. The relief valve 20 adjusts the opening to restore the system pressure to the set pressure of the relief valve 20. The transient characteristic curve of the relief valve 20 can be obtained by collecting data from the pressure sensor 21. Since the opening time of the hydraulically controlled one-way valve 16 is only within 5ms, compared with the electromagnetic ball valve in the prior art (see prior art Figure 1 The response time of about 50ms in 21) is greatly reduced, which can minimize the influence of the on-off valve itself on the test results and more accurately test the transient characteristic curve of the relief valve 20.

[0026] The foregoing is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A test method for testing transient response characteristics of a relief valve, characterized in that: A device for testing transient response characteristics of a relief valve is disclosed, comprising an oil tank (1), an oil source motor (2), an oil source pump (3), a hydraulically controlled pilot circuit motor (4), a hydraulically controlled pilot circuit pump (5), a one-way valve (6), a return oil filter (7), a high-pressure filter (8), a hydraulically controlled pilot circuit electromagnetic relief valve (9), a main circuit electromagnetic relief valve (10), a hydraulically controlled pilot circuit pressure gauge (11), a main circuit pressure gauge (12), a return oil circuit pressure gauge (13), a return oil circuit one-way valve (14), a solenoid valve (15), a hydraulically controlled one-way valve (16), a throttle valve (17), a flow meter (18), a relief valve (20), and a pressure sensor (21). The oil source pump (3) is arranged on one side of the oil tank (1), the oil source motor (2) is located on the oil source pump (3), the hydraulically controlled pilot circuit pump (5) is arranged on the other side of the oil tank (1), and the hydraulically controlled pilot circuit motor ( 4) Located on the hydraulically controlled pilot circuit pump (5), two one-way valves (6) are provided, and the two one-way valves (6) are respectively provided on the oil source pump (3) and the hydraulically controlled pilot circuit pump (5), two high-pressure filters (8) are provided, and the two high-pressure filters (8) are respectively connected to the two one-way valves (6), the flow meter (18) is connected between the measured overflow valve (20) and the high-pressure filter (8), the hydraulically controlled one-way valve (16) is connected to the branch of the flow meter (18), the solenoid valve (15) is connected to the hydraulically controlled one-way valve (16), the throttle valve (17) is connected to the branch of the flow meter (18), the return oil circuit one-way valve (14) is connected to the solenoid valve (15), the pressure sensor (21) is connected to the flow meter (18), and both ends of the overflow valve (20) are connected between the return oil circuit one-way valve (14) and the pressure sensor (21); A main circuit pressure gauge (12) is provided on the side of the oil source pump (3) next to the one-way valve (6), a hydraulic pilot circuit electromagnetic overflow valve (9) is provided on the side of the hydraulic pilot circuit pump (5) next to the one-way valve (6), and the return oil circuit pressure gauge (13) is connected to the hydraulic one-way valve (16); The oil tank (1) is provided with an air filter (19); Two return oil filters (7) are provided, and a main circuit electromagnetic overflow valve (10) is provided on the branch of the high-pressure filter (8), one return oil filter (7) is connected between the main circuit electromagnetic overflow valve (10) and the oil tank (1), and the other return oil filter (7) is connected between the branch of the throttle valve (17) and the oil tank (1); a hydraulically controlled pilot circuit electromagnetic overflow valve (9) is connected to the side of the hydraulically controlled pilot circuit pressure gauge (11); The testing method comprises the following steps: Step 1: The hydraulic pilot circuit pump (5) supplies oil to the pilot ports of the hydraulic one-way valve (16) and the relief valve (20); Step 2: The solenoid valve (15) is de-energized, and the outlet pressure of the oil source pump (3) is regulated by adjusting the opening of the throttle valve (17); when the flow meter (18) has flow passing through, the system pressure detected by the pressure sensor (21) is the opening pressure of the relief valve (20); Step 3: When testing the transient response characteristics of the relief valve (20), the throttle valve (17) is completely closed, the solenoid valve (15) is de-energized, the hydraulic pilot circuit pump (5) is turned on and adjusted to the set pressure, and the system pressure is controlled by adjusting the relief valve (20); the solenoid valve (15) is suddenly energized to open the hydraulic control check valve (16), and at this time, part of the outlet flow of the oil source pump (3) returns to the oil tank (1) through the hydraulic control check valve (16), and the system pressure drops instantly. The relief valve (20) adjusts the opening to restore the system pressure to the set pressure of the relief valve (20), and the transient characteristic curve of the relief valve (20) can be obtained by collecting data from the pressure sensor (21).

Images