A performance test system for a low-pressure and large-flow overflow valve

Abstract

A performance test system for a low-pressure and large-flow overflow valve belongs to the field of overflow valve performance testing. The present invention aims to solve the problems existing in the existing performance test system for low-pressure and large-flow overflow valves, such as less collected data, only being able to test a single overflow valve, and limited test conditions. The present invention provides a performance test system for a low-pressure and large-flow overflow valve, and the test system includes an oil tank, a temperature control circuit, an oil supply circuit, and a step loading control circuit; the temperature control circuit is arranged on the oil tank, the oil supply circuit is connected in series at the oil inlet end of the step loading control circuit, the oil inlet end of the oil supply circuit is communicated with the oil tank, the oil outlet end of the oil supply circuit is communicated with the oil inlet end of the step loading control circuit, and the oil outlet end of the step loading control circuit is communicated with the return port of the oil tank. The present invention is mainly a device for testing the performance of one or more low-pressure and large-flow overflow valves.

Description

Technical Field

[0001] The invention belongs to the field of overflow valve performance testing, and in particular relates to a low-pressure and large-flow overflow valve performance testing system. Background Art

[0002] As an indispensable control element in the hydraulic system, the relief valve plays an important role in various fields. However, the performance of the relief valve, such as pressure setting accuracy, sensitivity, working stability, sealing and leakage, has a direct and huge impact on the normal operation of the entire hydraulic system. According to the working pressure of the relief valve, the relief valve can be divided into high-pressure, medium-pressure and low-pressure relief valves. After investigating the market demand, it is found that low-pressure relief valves are widely used in lubrication systems in the fields of steam turbines, ships, heavy machinery, aviation, etc. These fields urgently need a relief valve with large flow, low adjustable pressure and high standardization level. The technology of my country's low-pressure and large-flow relief valve industry is relatively backward. The relief valves produced domestically are mainly medium-high pressure and small and medium-sized flow valves. At present, the domestic fields of steam turbines, ships, heavy machinery, aviation, etc. are in urgent need of development. The development of high-performance low-pressure, large-flow relief valves in my country needs to be broken through. At the same time, a low-pressure, large-flow relief valve performance test system is designed to verify the working performance indicators and reliability of the low-pressure relief valve, provide an opportunity for quantitative detection for the development of low-pressure, large-flow relief valves, and provide technical support for the performance assessment of domestic relief valves. It is of great strategic significance to improve the research and development of high-performance low-pressure relief valves, promote the localization of low-pressure relief valve products, and develop low-pressure, large-flow relief valves with reasonable structure and process, high reliability, and excellent static and dynamic performance.

[0003] The existing low-pressure and high-flow relief valve performance test system has the following problems:

[0004] First, if the relief valve has the characteristics of low pressure regulation value and large flow rate, how to efficiently and accurately simulate the low-pressure and high-flow working conditions of the relief valve, and accurately perform performance tests on the relief valve under low-pressure and high-flow conditions based on comprehensive consideration of factors such as hydraulic system pulsation and pressure loss of related test components, is a problem of the relief valve test system;

[0005] Second, the traditional data acquisition instrument has relatively simple functions, collects a small number of signals, and has a slow acquisition speed. In terms of data processing and transmission, it relies on the analysis and data processing capabilities of separate computer software. If the overflow valve test system needs to collect a large number of signal types and quantities, it cannot be realized;

[0006] Third: At present, the overflow valve test system can often only test one type of overflow valve. If there are many types of overflow valves to be tested, it is difficult to test multiple overflow valves with one overflow valve test system because the operating conditions and working performance of different types of overflow valves are different, the flow rates when working are also different, and the flow span is large. Summary of the Invention

[0007] To solve the above problems, the present invention further provides a performance test system for a low-pressure and large-flow overflow valve;

[0008] A performance test system for a low-pressure and large-flow overflow valve, the test system includes an oil tank, a temperature control circuit, an oil supply circuit and a step loading control circuit; the temperature control circuit is arranged on the oil tank, the oil supply circuit is connected in series at the oil inlet end of the step loading control circuit, the oil inlet end of the oil supply circuit is communicated with the oil tank, the oil outlet end of the oil supply circuit is communicated with the oil inlet end of the step loading control circuit, and the oil outlet end of the step loading control circuit is communicated with the oil return port of the oil tank;

[0009] Furthermore, the oil tank includes an oil drain ball valve, a liquid level and liquid temperature gauge, a first temperature sensor, a liquid level sensor, an air filter and four stainless steel cleaning covers; the oil drain ball valve is arranged at the oil drain port of the oil tank, and the oil drain ball valve is connected in series with the oil tank, the liquid level and liquid temperature gauge is fixedly connected to the outer wall of the oil tank, and the contact end of the liquid level and liquid temperature gauge passes through the tank wall of the oil tank and is arranged in the oil tank, the first temperature sensor and the liquid level sensor are both fixedly connected to the outer wall of the oil tank, and the contact end of the first temperature sensor passes through the tank wall of the oil tank and is arranged in the oil tank, the contact end of the liquid level sensor passes through the tank wall of the oil tank and is arranged in the oil tank, the air filter is fixedly connected to the oil tank, and the air filtering end of the air filter is communicated with the inside of the oil tank, four cleaning holes are processed on the outer wall of the oil tank, a stainless steel cleaning cover is arranged on each cleaning hole, and each stainless steel cleaning cover is detachably connected to the oil tank;

[0010] Furthermore, the temperature control circuit includes an oil cooling circuit and an oil heating circuit, the oil cooling circuit is connected in series with the oil tank, and the oil heating circuit is connected in series with the oil tank;

[0011] Furthermore, the oil heating circuit includes four electric heaters, the four electric heaters are arranged in the oil tank, and each electric heater is connected to an external power supply through a wire;

[0012] Furthermore, the oil cooling circuit includes a first oil suction butterfly valve, a first flexible joint, a first screw pump group, a water cooling unit, an oil return filter and a check valve, the oil inlet end of the first screw pump group is communicated with the first oil outlet pipe on the oil tank through the first flexible joint, one oil outlet end of the first screw pump group is communicated with the first oil return pipe on the oil tank, and a check valve is connected in series on the first oil return pipe on the oil tank, the other oil outlet end of the first screw pump group is communicated with the oil inlet end of the water cooling unit, the oil outlet end of the water cooling unit is communicated with the oil inlet end of the oil return filter, the oil outlet end of the oil return filter is communicated with the second oil return pipe on the oil tank, and a first oil suction butterfly valve is connected in series on the first oil outlet pipe on the oil tank;

[0013] Further, the oil supply circuit includes a second oil suction butterfly valve, a second flexible joint, a second screw pump set, an accumulator safety valve block, an accumulator, a first overflow valve, a second overflow valve, a first pressure sensor, a third overflow valve, a first high-pressure butterfly valve, a sixth high-pressure butterfly valve, and a first pressure measurement module; the oil inlet end of the second screw pump set is connected to the second oil outlet pipe on the fuel tank through the second flexible joint, and the second oil suction butterfly valve is connected in series on the second oil outlet pipe on the fuel tank. One of the oil outlet ends of the second screw pump set is connected to the oil inlet end of the step loading control circuit. An auxiliary oil circuit is provided on one side of the second screw pump set. The auxiliary oil circuit includes an accumulator safety valve block and an accumulator. The accumulator is connected to the third oil return pipe of the fuel tank through the accumulator safety valve block. The accumulator safety valve block includes two ball valves, and the two ball valves are connected in series. A connecting pipe is provided between the two ball valves. The auxiliary oil circuit is connected in series with the oil outlet end of the second screw pump set through the connecting pipe. A three-way pressure regulating circuit is provided at the oil outlet end of the second screw pump set. The three-way pressure regulating circuit is composed of a first overflow valve, a second overflow valve, and a third overflow valve connected in parallel. The oil inlet end of the first overflow valve is connected to the oil outlet end of the second screw pump set through the first high-pressure butterfly valve. The oil inlet end of the third overflow valve is connected in series with the oil outlet end of the second screw pump set through the sixth high-pressure butterfly valve. The oil inlet end of the second overflow valve is connected in series with the oil outlet end of the second screw pump set. A first pressure sensor is provided between the oil inlet end of the second overflow valve and the oil outlet end of the second screw pump set. A first pressure measurement module is also connected in series at the oil outlet end of the second screw pump set. The oil outlet ends of the first overflow valve, the second overflow valve, and the third overflow valve are all connected to the fourth oil return pipe of the fuel tank;

[0014] Further, the step loading control circuit includes a third oil suction butterfly valve, a shock absorber throat, a step loading device, a second pressure measurement module, a fourth pressure sensor, a first test oil circuit, and a second test oil circuit. The first test oil circuit and the second test oil circuit are connected in parallel. The oil inlet end of the first test oil circuit is connected in series with the oil outlet end of the second screw pump set. The oil outlet end of the first test oil circuit is connected to the fuel tank. The oil inlet end of the second test oil circuit is connected in series with the oil outlet end of the second screw pump set. The oil outlet end of the second test oil circuit is connected to the fuel tank. The oil inlet end of the step loading device is connected to the third oil outlet pipe of the fuel tank. The first oil outlet end of the step loading device is connected to the first test oil circuit. The second oil outlet end of the step loading device is respectively connected to the second test oil circuit. The third oil outlet pipe of the fuel tank is sequentially connected in series with a third oil suction butterfly valve and a shock absorber throat along the oil movement direction. A second pressure measurement module and a fourth pressure sensor are connected in series on the step loading device;

[0015] Further, the first test oil circuit includes a second high-pressure butterfly valve and a first step loading oil circuit block. The inlet end of the first step loading oil circuit block is communicatively connected to the outlet end of the second screw pump set, and a second high-pressure butterfly valve is connected in series between the inlet end of the first step loading oil circuit block and the outlet end of the second screw pump set. The first outlet end in the first step loading oil circuit block is connected to the fifth oil return pipe of the fuel tank, and the second outlet end in the first step loading oil circuit block is connected to the sixth oil return pipe in the fuel tank. The first outlet end of the step loading device is communicatively connected to the first step loading oil circuit block;

[0016] Further, the second test oil circuit includes a third high-pressure butterfly valve, a fourth high-pressure butterfly valve, a fifth high-pressure butterfly valve, a second pressure sensor, a third pressure sensor, a second temperature sensor, a flowmeter, a second step loading oil circuit block, a third pressure measuring module, and a fourth pressure measuring module. The inlet end of the second step loading oil circuit block is communicatively connected to the outlet end of the second screw pump set through a third high-pressure butterfly valve. The inlet end of the second step loading oil circuit block is sequentially connected in series with a third pressure measuring module, a second temperature sensor, and a second pressure sensor along the oil movement direction. The first outlet end of the second step loading oil circuit block is connected to the seventh oil return pipe in the fuel tank. The second outlet end of the second step loading oil circuit block is sequentially connected in series with a third pressure sensor and a fourth pressure measuring module along the oil movement direction. The second outlet end of the second step loading oil circuit block is branched into a first oil outlet pipeline and a second oil outlet pipeline. The outlet end of the first oil outlet pipeline is connected to the eighth oil return pipe in the fuel tank. A fourth high-pressure butterfly valve and a flowmeter are sequentially connected in series along the oil movement direction on the first oil outlet pipeline. The outlet end of the second oil outlet pipeline is connected to the ninth oil return pipe in the fuel tank. A fifth high-pressure butterfly valve is connected in series on the second oil outlet pipeline. The second outlet end of the step loading device is communicatively connected to the second step loading oil circuit block;

[0017] Further, the first pressure measuring module, the second pressure measuring module, the third pressure measuring module, and the fourth pressure measuring module have the same composition structure. The first pressure measuring module, the second pressure measuring module, the third pressure measuring module, and the fourth pressure measuring module are all pressure gauges. The contact end of the pressure gauge is connected in series with the measured part through a pressure measuring gauge wire and a pressure measuring joint.

[0018] The beneficial effects of the present application compared with the prior art:

[0019] In view of the problems of low-pressure large-flow working condition simulation and performance testing technology for overflow valves, multi-channel signal acquisition and transmission, and real-time calculation and output technology, as well as the integrated test bench design technology covering the testing of multiple models of overflow valves, a new type of low-pressure large-flow overflow valve performance testing system is proposed. A screw pump is used as the power source of the hydraulic system, a temperature control system and a cooling circuit are designed to maintain the temperature of the overflow valve testing system within a safe range, and sensors are added to achieve multi-channel signal acquisition and fault warning. It provides a theoretical guarantee for realizing the testing of low-pressure large-flow overflow valves, and is of great strategic significance for improving the research and development of high-performance low-pressure overflow valves and developing low-pressure large-flow overflow valves with reasonable structural technology, high reliability, and excellent static and dynamic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the performance testing system provided by this application;

[0021] Figure 2 It is a partial circuit diagram of the oil cooling system described in this application;

[0022] Figure 3 It is a partial circuit diagram of the oil heating system described in this application;

[0023] Figure 4 It is a schematic diagram of the oil supply system described in this application;

[0024] Figure 5 It is a schematic diagram of the step loading control system described in this application;

[0025] Figure 6 It is a schematic diagram of the composition of the pressure measurement module described in this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] DETAILED DESCRIPTION OF THE EMBODIMENT 1: In combination with Figures 1 to 6 This embodiment is described. In this embodiment, a low-pressure large-flow overflow valve performance testing system is provided. The testing system includes a fuel tank 12, a temperature control circuit, an oil supply circuit, and a step loading control circuit; the temperature control circuit is arranged on the fuel tank 12, the oil supply circuit is connected in series at the oil inlet end of the step loading control circuit, the oil inlet end of the oil supply circuit is communicated with the fuel tank 12, the oil outlet end of the oil supply circuit is communicated with the oil inlet end of the step loading control circuit, and the oil outlet end of the step loading control circuit is communicated with the return port of the fuel tank 12.

[0027] DETAILED DESCRIPTION OF THE EMBODIMENT 2: In combination with Figures 1 to 6Describing this embodiment, the difference between this embodiment and the first specific embodiment is that in this embodiment, the fuel tank 12 includes an oil drain ball valve 1, a liquid level and temperature gauge 2, a first temperature sensor 8, a liquid level sensor 9, an air filter 10, and four stainless steel cleaning covers 13; the oil drain ball valve 1 is arranged at the oil drain port of the fuel tank, and the oil drain ball valve 1 is serially arranged with the fuel tank 12. The liquid level and temperature gauge 2 is fixedly connected to the outer wall of the fuel tank 12, and the contact end of the liquid level and temperature gauge 2 passes through the tank wall of the fuel tank 12 and is arranged in the fuel tank 12. The first temperature sensor 8 and the liquid level sensor 9 are both fixedly connected to the outer wall of the fuel tank 12, and the contact end of the first temperature sensor 8 passes through the tank wall of the fuel tank 12 and is arranged in the fuel tank 12. The contact end of the liquid level sensor 9 passes through the tank wall of the fuel tank 12 and is arranged in the fuel tank 12. The air filter 10 is fixedly connected to the fuel tank 12, and the air filtering end of the air filter 10 is communicated with the inside of the fuel tank 12. Four cleaning holes are processed on the outer wall of the fuel tank 12, and a stainless steel cleaning cover 13 is arranged on each cleaning hole. Each stainless steel cleaning cover 13 is detachably connected to the fuel tank 12. Other components and connection methods are the same as those in the first specific embodiment.

[0028] In this embodiment, a variety of sensors are added in the fuel tank 12, which can accurately monitor the temperature and liquid level of the working oil in the fuel tank. At the same time, the air filter 10 is introduced to ensure the purity of the oil in the fuel tank 12.

[0029] Specific embodiment three: Combining Figures 1 to 6 Describing this embodiment, the difference between this embodiment and the second specific embodiment is that in this embodiment, the temperature control circuit includes an oil cooling circuit and an oil heating circuit. The oil cooling circuit is serially arranged with the fuel tank 12, and the oil heating circuit is serially arranged with the fuel tank 12. Other components and connection methods are the same as those in the second specific embodiment.

[0030] In this embodiment, if cooling is required, the water chiller in the oil cooling circuit needs to be turned on. If heating is required, the heater and oil circulation in the oil heating circuit need to be turned on to prevent the bottom of the fuel tank from getting scorched.

[0031] Specific embodiment four: Combining Figures 1 to 6 Describing this embodiment, the difference between this embodiment and the third specific embodiment is that in this embodiment, the oil heating circuit includes four electric heaters 11. The four electric heaters 11 are arranged in the fuel tank 12, and each electric heater 11 is connected to an external power supply through a wire. Other components and connection methods are the same as those in the third specific embodiment.

[0032] In this embodiment, turning on the electric heaters 11 can realize heating the oil in the fuel tank.

[0033] Specific embodiment five: Combining Figures 1 to 6Regarding this embodiment, the difference from the fourth specific embodiment is that in this embodiment, the oil cooling circuit includes a first oil suction butterfly valve 3, a first flexible joint 4, a first screw pump unit 5, a water-cooled unit 6, an oil return filter 7, and a check valve 29. The oil inlet end of the first screw pump unit 5 is connected to the first oil outlet pipe on the fuel tank 12 through the first flexible joint 4. One oil outlet end of the first screw pump unit 5 is connected to the first return pipe on the fuel tank 12, and a check valve 29 is connected in series on the first return pipe of the fuel tank 12. The other oil outlet end of the first screw pump unit 5 is connected to the oil inlet end of the water-cooled unit 6. The oil outlet end of the water-cooled unit 6 is connected to the oil inlet end of the oil return filter 7. The oil outlet end of the oil return filter 7 is connected to the second return pipe on the fuel tank 12. A first oil suction butterfly valve 3 is connected in series on the first oil outlet pipe of the fuel tank 12. Other components and connection methods are the same as those in the fourth specific embodiment.

[0034] In this embodiment, when the motor in the first screw pump unit 5 is started, the screw pump starts to work and suck oil. The oil flows upward from the fuel tank, passes through the open first oil suction butterfly valve 3, reaches the first screw pump unit 5, and flows out after the operation of the first screw pump unit 5. It is divided into two circuits. One circuit passes through the check valve 29 and reaches the fuel tank, and the other circuit passes through the water-cooled unit 6 to achieve the cooling function and reaches the fuel tank through the oil return filter 7.

[0035] Specific embodiment six: In combination with Figures 1 to 6Describing this embodiment, the difference between this embodiment and the fifth specific embodiment is that in this embodiment, the oil supply circuit includes a second oil suction butterfly valve 14, a second flexible joint 15, a second screw pump group 16, an accumulator safety valve block 18, an accumulator 19, a first overflow valve 24, a second overflow valve 25, a first pressure sensor 26.1, a third overflow valve 34, a first high-pressure butterfly valve 23.1, a sixth high-pressure butterfly valve 23.6, and a first pressure measurement module; the inlet end of the second screw pump group 16 is communicated with the second oil outlet pipe on the fuel tank 12 through the second flexible joint 15, and a second oil suction butterfly valve 14 is connected in series on the second oil outlet pipe on the fuel tank 12. One of the oil outlet ends of the second screw pump group 16 is communicated with the inlet end of the step loading control circuit. An auxiliary oil circuit is provided on one side of the second screw pump group 16. The auxiliary oil circuit includes an accumulator safety valve block 18 and an accumulator 19. The oil outlet end of the accumulator 19 is connected to the third oil return pipe of the fuel tank 12 through the accumulator safety valve block 18. The accumulator safety valve block 18 includes two ball valves 17, and the two ball valves 17 are connected in series. A communication pipeline is provided between the two ball valves 17. The auxiliary oil circuit is connected in series with the oil outlet end of the second screw pump group 16 through the communication pipeline. A three-way pressure regulating circuit is provided at the oil outlet end of the second screw pump group 16. The three-way pressure regulating circuit is formed by the parallel connection of a first overflow valve 24, a second overflow valve 25, and a third overflow valve 34. The inlet end of the first overflow valve 24 is communicated with the oil outlet end of the second screw pump group 16 through the first high-pressure butterfly valve 23.1. The inlet end of the third overflow valve 34 is connected in series with the oil outlet end of the second screw pump group 16 through the sixth high-pressure butterfly valve 23.6. The inlet end of the second overflow valve 25 is connected in series with the oil outlet end of the second screw pump group 16. A first pressure sensor 26.1 is provided between the inlet end of the second overflow valve 25 and the oil outlet end of the second screw pump group 16. A first pressure measurement module is also connected in series at the oil outlet end of the second screw pump group 16. The oil outlet ends of the first overflow valve 24, the second overflow valve 25, and the third overflow valve 34 are all connected to the fourth oil return pipe of the fuel tank 12. Other compositions and connection methods are the same as those in the fifth specific embodiment.

[0036] In this embodiment, open the second oil suction butterfly valve 14, start the motor in the second screw pump unit 16, and the screw pump starts to work and suck oil. The oil flows upward from the oil tank, passes through the open second oil suction butterfly valve 14, reaches the second screw pump unit 16, and flows out after the operation of the second screw pump unit 16. This process is the oil supply process of the performance test system. The accumulator safety valve block 18 and the accumulator 19 are used as auxiliaries of the oil supply system and cooperate with the oil source to work better. Among them, the accumulator 19 also plays a role in protecting the oil path during oil supply. When the supplied oil pressure is relatively large, the accumulator 19 can play a pressure relief role and suck the excess oil into the accumulator 19 (this situation is for when the system has just started and the overflow valve 24 has not fully worked). When the supplied oil pressure is relatively small, the accumulator 19 can supplement the sucked oil along the connecting pipeline into the test circuit to play a role in boosting and stabilizing the oil supply. A three-way parallel pressure regulating circuit is designed, namely the first overflow valve 24, the second overflow valve 25, and the third overflow valve 34. The second overflow valve 25 is the safety valve of the system. By opening and closing the first high-pressure butterfly valve 23.1 and the sixth high-pressure butterfly valve 23.6, the on-off of the first overflow valve 24 and the third overflow valve 34 can be realized, and the overflow valve with different pressure regulating ranges can be selected to adjust the system pressure required for testing the tested overflow valve. The first pressure sensor 26.1 can measure the pressure passing through the second overflow valve 25.

[0037] Specific Embodiment Seven: Combining Figures 1 to 6 This embodiment is described. The difference between this embodiment and Specific Embodiment Six is that in this embodiment, the step loading control circuit includes a third oil suction butterfly valve 31, a shock absorber throat 32, a step loading device 33, a second pressure measurement module, a fourth pressure sensor 26.4, a first test oil circuit and a second test oil circuit. The first test oil circuit and the second test oil circuit are arranged in parallel. The oil inlet end of the first test oil circuit is serially arranged with the oil outlet end of the second screw pump unit 16. The oil outlet end of the first test oil circuit is communicated with the oil tank 12. The oil inlet end of the second test oil circuit is serially arranged with the oil outlet end of the second screw pump unit 16. The oil outlet end of the second test oil circuit is communicated with the oil tank 12. The oil inlet end of the step loading device 33 is communicated with the third oil outlet pipe of the oil tank 12. The first oil outlet end of the step loading device 33 is communicated with the first test oil circuit. The second oil outlet end of the step loading device 33 is respectively communicated with the second test oil circuit. The third oil suction butterfly valve 31 and the shock absorber throat 32 are serially arranged on the third oil outlet pipe of the oil tank 12 along the movement direction of the oil. The second pressure measurement module and the fourth pressure sensor 26.4 are serially arranged on the step loading device 33;

[0038] The first test oil circuit includes a second high-pressure butterfly valve 23.2 and a first step-loading oil circuit block 30.1. The inlet end of the first step-loading oil circuit block 30.1 is communicatively connected to the outlet end of the second screw pump set 16, and a second high-pressure butterfly valve 23.2 is connected in series between the inlet end of the first step-loading oil circuit block 30.1 and the outlet end of the second screw pump set 16. The first outlet end in the first step-loading oil circuit block 30.1 is connected to the fifth oil return pipe of the fuel tank 12, and the second outlet end in the first step-loading oil circuit block 30.1 is connected to the sixth oil return pipe in the fuel tank 12. The first outlet end of the step-loading device 33 is communicatively connected to the first step-loading oil circuit block 30.1;

[0039] The second test oil circuit includes a third high-pressure butterfly valve 23.3, a fourth high-pressure butterfly valve 23.4, a fifth high-pressure butterfly valve 23.5, a second pressure sensor 26.2, a third pressure sensor 26.3, a second temperature sensor 27, a flowmeter 28, a second step-loading oil circuit block 30.2, a third pressure measurement module, and a fourth pressure measurement module. The inlet end of the second step-loading oil circuit block 30.2 is communicatively connected to the outlet end of the second screw pump set 16 through the third high-pressure butterfly valve 23.3. The inlet end of the second step-loading oil circuit block 30.2 is successively connected in series with a third pressure measurement module, a second temperature sensor 27, and a second pressure sensor 26.2 along the oil movement direction. The first outlet end of the second step-loading oil circuit block 30.2 is connected to the seventh oil return pipe in the fuel tank 12. The second outlet end of the second step-loading oil circuit block 30.2 is successively connected in series with a third pressure sensor 26.3 and a fourth pressure measurement module along the oil movement direction. The second outlet end of the second step-loading oil circuit block 30.2 is branched into a first oil outlet pipeline and a second oil outlet pipeline. The outlet end of the first oil outlet pipeline is connected to the eighth oil return pipe in the fuel tank 12, and a fourth high-pressure butterfly valve 23.4 and a flowmeter 28 are successively connected in series along the oil movement direction on the first oil outlet pipeline. The outlet end of the second oil outlet pipeline is connected to the ninth oil return pipe in the fuel tank 12, and a fifth high-pressure butterfly valve 23.5 is connected in series on the second oil outlet pipeline. The second outlet end of the step-loading device 33 is communicatively connected to the second step-loading oil circuit block 30.2. Other components and connection manners are the same as those in the sixth specific implementation manner.

[0040] In this embodiment, the second high-pressure butterfly valve 23.2 and the third high-pressure butterfly valve 23.3 respectively control two identical test oil circuits. Taking the oil circuit of the third high-pressure butterfly valve 23.3 as an example, oil flows out from the oil supply system, passes through the third high-pressure butterfly valve 23.3, and reaches the step loading oil block 30.2. At this time, there are three working circuits in total: one directly returns to the oil tank through the two-way directional control valve in the loading oil block 30.2; one passes through the overflow valve under test in the loading oil block 30.2, and returns to the oil tank after passing through the high-pressure butterfly valve 23.4 and the flowmeter 28; one passes through the overflow valve under test in the loading oil block 30.2 and returns to the oil tank through the high-pressure butterfly valve 23.5. The two-way directional control valve in the loading oil block 30.2 is the key to realizing the change of the inlet pressure of the valve under test. The on-off of the two-way directional control valve is controlled by the step loading device 33 in the control oil circuit. Open the oil suction butterfly valve 31. When the motor in the step loading device 33 starts to work, the pump starts to work and suck oil. After the oil is transported by the pump, it flows to the two-position four-way directional control solenoid valve in the step loading device 33 and reaches the two-way directional control valve in the loading oil block 30.2, realizing the on-off of the two-way directional control valve, and then causing the inlet pressure of the overflow valve under test in the loading oil block 30.2 to increase. The pressure gauge 22 can directly read the pressure at the inlet and outlet of the overflow valve under test, the pressure sensor 26 can measure the pressure at the inlet and outlet of the overflow valve under test, and the temperature sensor 27 can measure the temperature at the inlet and outlet of the overflow valve under test.

[0041] Specific Embodiment 8: Combining Figures 1 to 6 To illustrate this embodiment, the difference between this embodiment and Specific Embodiment 7 is that the component structures of the first pressure measurement module, the second pressure measurement module, the third pressure measurement module, and the fourth pressure measurement module are the same in this embodiment. The first pressure measurement module, the second pressure measurement module, the third pressure measurement module, and the fourth pressure measurement module are all pressure gauges 22. The contact end of the pressure gauge 22 is serially arranged with the part under test through the pressure gauge line 21 and the pressure measurement joint 20. Other components and connection methods are the same as those in Specific Embodiment 7.

[0042] In this embodiment, the pressure measurement module is mainly used to measure the hydraulic pressure in each area under test.

[0043] The present invention has been disclosed above with preferred embodiments. However, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make some changes or modifications to the above-disclosed structure and technical content to form equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A performance test system for a low-pressure and large-flow overflow valve, characterized in that: The described test system includes an oil tank (12), a temperature control loop, an oil supply loop, and a step loading control loop; the temperature control loop is arranged on the oil tank (12), the oil supply loop is connected in series at the oil inlet end of the step loading control loop, the oil inlet end of the oil supply loop is communicated with the oil tank (12), the oil outlet end of the oil supply loop is communicated with the oil inlet end of the step loading control loop, and the oil outlet end of the step loading control loop is communicated with the return port of the oil tank (12); The oil tank (12) includes an oil drain ball valve (1), a liquid level and temperature gauge (2), a first temperature sensor (8), a liquid level sensor (9), an air filter (10), and four stainless steel cleaning covers (13); the oil drain ball valve (1) is arranged at the oil drain port of the oil tank, and the oil drain ball valve (1) is connected in series with the oil tank (12), the liquid level and temperature gauge (2) is fixedly connected to the outer wall of the oil tank (12), and the contact end of the liquid level and temperature gauge (2) passes through the tank wall of the oil tank (12) and is arranged in the oil tank (12), the first temperature sensor (8) and the liquid level sensor (9) are both fixedly connected to the outer wall of the oil tank (12), and the contact end of the first temperature sensor (8) passes through the tank wall of the oil tank (12) and is arranged in the oil tank (12), the contact end of the liquid level sensor (9) passes through the tank wall of the oil tank (12) and is arranged in the oil tank (12), the air filter (10) is fixedly connected to the oil tank (12), and the air filtering end of the air filter (10) is communicated with the inside of the oil tank (12), four cleaning holes are processed on the outer wall of the oil tank (12), a stainless steel cleaning cover (13) is arranged on each cleaning hole, and each stainless steel cleaning cover (13) is detachably connected to the oil tank (12); The temperature control loop includes an oil cooling loop and an oil heating loop, the oil cooling loop is connected in series with the oil tank (12), and the oil heating loop is connected in series with the oil tank (12); The oil heating loop includes four electric heaters (11), the four electric heaters (11) are arranged in the oil tank (12), and each electric heater (11) is connected to an external power supply through a wire; The oil cooling loop includes a first oil suction butterfly valve (3), a first flexible joint (4), a first screw pump group (5), a water cooling unit (6), an oil return filter (7), and a check valve (29), the oil inlet end of the first screw pump group (5) is communicated with the first oil outlet pipe on the oil tank (12) through the first flexible joint (4), one oil outlet end of the first screw pump group (5) is communicated with the first oil return pipe on the oil tank (12), and a check valve (29) is connected in series on the first oil return pipe on the oil tank (12), the other oil outlet end of the first screw pump group (5) is communicated with the oil inlet end of the water cooling unit (6), the oil outlet end of the water cooling unit (6) is communicated with the oil inlet end of the oil return filter (7), the oil outlet end of the oil return filter (7) is communicated with the second oil return pipe on the oil tank (12), and a first oil suction butterfly valve (3) is connected in series on the first oil outlet pipe on the oil tank (12); The fuel supply circuit includes a second oil suction butterfly valve (14), a second flexible joint (15), a second screw pump unit (16), an accumulator safety valve block (18), an accumulator (19), a first overflow valve (24), a second overflow valve (25), a first pressure sensor (26.1), a third overflow valve (34), a first high-pressure butterfly valve (23.1), a sixth high-pressure butterfly valve (23.6), and a first pressure measurement module. The inlet end of the second screw pump unit (16) is connected to the second oil outlet pipe on the fuel tank (12) through the second flexible joint (15). A second oil suction butterfly valve (14) is connected in series on the second oil outlet pipe of the fuel tank (12). One of the outlet ends of the second screw pump unit (16) is connected to the inlet end of the step loading control circuit. An auxiliary oil circuit is provided on one side of the second screw pump unit (16). The auxiliary oil circuit includes an accumulator safety valve block (18) and an accumulator (19). The accumulator (19) is connected to the third oil return pipe of the fuel tank (12) through the accumulator safety valve block (18). The accumulator safety valve block (18) includes two ball valves (17), and the two ball valves (17) are connected in series. A connecting pipeline is provided between the two ball valves (17). The auxiliary oil circuit is connected in series with the outlet end of the second screw pump unit (16) through the connecting pipeline. A three-way pressure regulating circuit is provided at the outlet end of the second screw pump unit (16). The three-way pressure regulating circuit is composed of a first overflow valve (24), a second overflow valve (25), and a third overflow valve (34) connected in parallel. The inlet end of the first overflow valve (24) is connected to the outlet end of the second screw pump unit (16) through the first high-pressure butterfly valve (23.1). The inlet end of the third overflow valve (34) is connected in series with the outlet end of the second screw pump unit (16) through the sixth high-pressure butterfly valve (23.6). The inlet end of the second overflow valve (25) is connected in series with the outlet end of the second screw pump unit (16). A first pressure sensor (26.1) is provided between the inlet end of the second overflow valve (25) and the outlet end of the second screw pump unit (16). A first pressure measurement module is also connected in series at the outlet end of the second screw pump unit (16). The outlet ends of the first overflow valve (24), the second overflow valve (25), and the third overflow valve (34) are all connected to the fourth oil return pipe of the fuel tank (12). The step loading control circuit includes a third oil suction butterfly valve (31), a shock absorber throat (32), a step loading device (33), a second pressure measurement module, a fourth pressure sensor (26.4), a first test oil circuit, and a second test oil circuit.

2. The performance testing system for a low-pressure and large-flow overflow valve according to claim 1, wherein: The first test oil circuit and the second test oil circuit are arranged in parallel. The oil inlet end of the first test oil circuit is arranged in series with the oil outlet end of the second screw pump group (16). The oil outlet end of the first test oil circuit is communicated with the oil tank (12). The oil inlet end of the second test oil circuit is arranged in series with the oil outlet end of the second screw pump group (16). The oil outlet end of the second test oil circuit is communicated with the oil tank (12). The oil inlet end of the step loading device (33) is communicated with the third oil outlet pipe of the oil tank (12). The first oil outlet end of the step loading device (33) is communicated with the first test oil circuit. The second oil outlet end of the step loading device (33) is respectively communicated with the second test oil circuit. A third oil suction butterfly valve (31) and a shock absorber throat (32) are arranged in series on the third oil outlet pipe of the oil tank (12) along the direction of oil movement. A second pressure measurement module and a fourth pressure sensor (26.4) are arranged in series on the step loading device (33); The first test oil circuit includes a second high-pressure butterfly valve (23.2) and a first step loading oil circuit block (30.1). The oil inlet end of the first step loading oil circuit block (30.1) is communicated with the oil outlet end of the second screw pump group (16). A second high-pressure butterfly valve (23.2) is arranged in series between the oil inlet end of the first step loading oil circuit block (30.1) and the oil outlet end of the second screw pump group (16). The first oil outlet end in the first step loading oil circuit block (30.1) is connected to the fifth oil return pipe of the oil tank (12). The second oil outlet end in the first step loading oil circuit block (30.1) is connected to the sixth oil return pipe in the oil tank (12). The first oil outlet end of the step loading device (33) is communicated with the first step loading oil circuit block (30.1); The second test oil circuit includes a third high-pressure butterfly valve (23.3), a fourth high-pressure butterfly valve (23.4), a fifth high-pressure butterfly valve (23.5), a second pressure sensor (26.2), a third pressure sensor (26.3), a second temperature sensor (27), a flowmeter (28), a second step loading oil circuit block (30.2), a third pressure measurement module, and a fourth pressure measurement module. The oil inlet end of the second step loading oil circuit block (30.2) is connected to the oil outlet end of the second screw pump set (16) through the third high-pressure butterfly valve (23.3). Along the oil movement direction, the oil inlet end of the second step loading oil circuit block (30.2) is successively connected in series with the third pressure measurement module, the second temperature sensor (27), and the second pressure sensor (26.2). The first oil outlet end of the second step loading oil circuit block (30.2) is connected to the seventh oil return pipe in the fuel tank (12). The second oil outlet end of the second step loading oil circuit block (30.2) is successively connected in series with the third pressure sensor (26.3) and the fourth pressure measurement module along the oil movement direction. The second oil outlet end of the second step loading oil circuit block (30.2) is branched into a first oil outlet pipeline and a second oil outlet pipeline. The oil outlet end of the first oil outlet pipeline is connected to the eighth oil return pipe in the fuel tank (12). Along the oil movement direction, the fourth high-pressure butterfly valve (23.4) and the flowmeter (28) are successively connected in series on the first oil outlet pipeline. The oil outlet end of the second oil outlet pipeline is connected to the ninth oil return pipe in the fuel tank (12). The fifth high-pressure butterfly valve (23.5) is connected in series on the second oil outlet pipeline. The second oil outlet end of the step loading device (33) is connected to the second step loading oil circuit block (30.2).

3. A performance test system for a low-pressure large-flow overflow valve according to claim 2, characterized in that: The first pressure measurement module, the second pressure measurement module, the third pressure measurement module, and the fourth pressure measurement module have the same composition structure. The first pressure measurement module, the second pressure measurement module, the third pressure measurement module, and the fourth pressure measurement module are all pressure gauges (22). The contact end of the pressure gauge (22) is connected in series with the measured part through a pressure gauge line (21) and a pressure measurement joint (20).

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