A hydraulic flow test bench

Abstract

The utility model discloses a hydraulic flow test bench, this test bench includes integratedly setting in the same table body frame's dynamic pressure system, static pressure system, oil return system, centralized oil source and oil tank, and dynamic pressure system provides adjustable flow and pressure to the product under test under the centralized oil source oil supply condition through electric pump, proportional pressure reducing valve, remote control throttle valve and flowmeter etc. component, is used for the flow resistance test of hydraulic valve, and static pressure system carries out pressurization and pressure maintenance to the product under test through hand -operated pump, check valve and high pressure needle valve, is used for the leakproofness test of hydraulic valve, and the test bench still is provided with multipoint pressure sensor and pressure difference sensor, is used for monitoring system pressure state and the import and export pressure difference of product under test, realizes the integration of hydraulic valve flow resistance test and leakproofness test through integrating dynamic pressure test loop and static pressure test loop in the same equipment, has the advantages such as compact structure, strong universality, wide test range and high test efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic testing equipment technology, specifically a hydraulic flow test bench. Background Technology

[0002] As a key control component in a hydraulic system, the flow resistance and sealing performance of hydraulic valves directly affect the system's energy efficiency, stability, and reliability. Therefore, during the product design and factory testing phases, hydraulic valves typically undergo flow resistance and sealing tests to verify whether they meet relevant technical requirements.

[0003] In existing technologies, flow resistance tests on hydraulic valves are typically conducted under dynamic pressure conditions. This involves supplying a certain flow rate of hydraulic medium to the valve under test via an electric pump, and measuring the pressure changes between the valve's inlet and outlet under a set flow rate to assess its flow resistance characteristics. Conversely, sealing tests on hydraulic valves are mostly conducted under static pressure conditions. This typically involves applying and maintaining pressure to the valve using a manual pump to test its sealing performance in no-flow or low-flow conditions. Because these two types of tests differ significantly in pressure supply methods, piping structures, and test conditions, existing testing equipment is often designed for a single, specific test requirement.

[0004] For example, patent document CN116104837B discloses a test bench structure for testing hydraulic valves. This test bench typically includes hydraulic components such as an oil tank, variable pump, pressure sensor, flow meter, throttle valve, directional valve, and check valve. Such test benches generally have a relatively complete oil supply and return structure, suitable for performance testing of various types of hydraulic valves. However, these test benches often use an independent pump source as the core of the oil supply, resulting in a large system circuit and relatively complex structure. They are usually configured for multi-circuit or multi-condition testing. Under centralized oil supply conditions, it is difficult to simultaneously meet the different operating conditions of dynamic pressure flow resistance testing and static pressure sealing testing within the same test bench structure. This leads to high equipment configuration costs and significant complexity in use and maintenance.

[0005] Patent document CN115111229A describes a flow and pressure detection loop designed to meet the flow resistance testing requirements of hydraulic valves. It detects pressure changes in the hydraulic valve under specific flow conditions to obtain the valve's flow resistance characteristics. The structural design of this type of testing system typically focuses on the flow resistance testing function, resulting in a relatively simple system configuration. This makes it difficult to meet the requirements of hydraulic valve sealing tests for static pressure loading, pressure holding stability, and independent pressurization methods. It usually requires the use of other specialized equipment to complete the sealing performance testing of hydraulic valves. The overall testing process is somewhat fragmented, and the equipment versatility and testing efficiency need further improvement.

[0006] Currently, most common hydraulic flow test benches employ a centralized oil supply structure, primarily suitable for dynamic pressure flow resistance testing of hydraulic valves. Their system configuration and piping configuration often fail to meet the requirements of static pressure holding tests for pressure stability and independent pressurization. Meanwhile, test benches specifically designed for sealing tests are often simple in structure and have limited functionality, making it difficult to achieve the flow regulation and measurement functions required for flow resistance testing. Therefore, under current technological conditions, flow resistance and sealing tests typically need to be performed on separate testing equipment, increasing equipment configuration costs and test space requirements, reducing testing efficiency, and hindering unified testing and comprehensive performance evaluation of hydraulic valve products. To address this, a hydraulic flow test bench is proposed. Utility Model Content

[0007] The technical problem this invention aims to solve is to overcome existing defects and provide a hydraulic flow test bench. By integrating a dynamic pressure system and a static pressure system within the same frame, the test bench can perform flow resistance tests on hydraulic valves under dynamic pressure conditions and sealing tests on hydraulic valves under static pressure conditions. This allows for comprehensive testing of multiple key performance characteristics of hydraulic valves using the same equipment. Under centralized oil supply conditions, and with the rationally designed main oil circuit, bypass return branch, and return oil system, the required test pressure and flow rate can be stably obtained, effectively solving the problems in the background technology.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic flow test bench, comprising a dynamic pressure system, a static pressure system, a return oil system, a centralized oil source, and an oil tank integrated within the same frame. The oil tank is connected to the dynamic pressure system sequentially via a ball valve three, an electric pump, and a check valve four. An air filter is provided on the oil tank, and the oil tank is connected to a liquid level sensor via a needle valve three. The dynamic pressure system includes an oil supply line connected downstream of the one-way valve. The oil supply line is sequentially connected to a ball valve, a filter, and a proportional pressure reducing valve. Downstream of the proportional pressure reducing valve, a temperature sensor, a pressure sensor, and a shut-off valve are sequentially installed. Downstream of the shut-off valve, a continuously installed main oil circuit of the dynamic pressure system is formed. The main oil line of the dynamic pressure system is provided with a bypass return branch. The bypass return branch is connected in sequence to remote control throttle valve one and / or remote control throttle valve two, ball valve four, filter two and check valve five, and is connected to the oil tank. The check valve five is set to allow oil to flow unidirectionally only from the filter two side to the oil tank side. The main oil line of the dynamic pressure system is provided with a product oil supply branch for supplying oil to the test product. The product oil supply branch is equipped with a remote control throttle valve three. Downstream of the remote control throttle valve three, there are two independent detection branches. One detection branch is connected in sequence to a check valve two and a flow meter one, and the other detection branch is connected in sequence to a check valve three and a flow meter two. The main oil circuit of the dynamic pressure system is provided with a small flow regulating branch, which is connected to the oil tank and is connected in sequence from the oil tank to the flow meter. The static pressure system includes an oil tank, a ball valve connected to the oil tank, a hand pump located downstream of the ball valve, and a check valve located on the oil outlet side of the hand pump. Downstream of the check valve, a high-pressure needle valve and a high-pressure needle valve are connected in sequence. The high-pressure needle valve is located between the oil tank and the high-pressure needle valve, and the high-pressure needle valve is connected to the oil inlet pipeline of the test product. The oil outlet pipeline of the test product is connected to an electro-hydraulic directional valve. The P port of the electro-hydraulic directional valve is connected upstream of a remote control throttle valve. The B port of the electro-hydraulic directional valve is connected to the oil tank via the throttle valve. The T port of the electro-hydraulic directional valve is connected to the oil tank. Pressure test connector 1, pressure test connector 2, and pressure test connector 3 are respectively installed on the oil inlet and outlet pipelines of the test product.

[0009] Furthermore, the proportional pressure reducing valve is used to adjust the system pressure to the range of 0 to 31.5 MPa.

[0010] Furthermore, the remote-controlled throttle valve three is used for flow regulation from 10 L / min to 150 L / min, and the throttle valve two is used for small flow regulation from 0 to 10 L / min.

[0011] Furthermore, the dynamic pressure system is used to perform flow resistance tests on the test product, and the static pressure system is used to perform sealing tests on the test product, so that the same test bench can perform performance tests on the test product under both dynamic and static pressure conditions.

[0012] Furthermore, the hydraulic system of the test bench is equipped with four differential pressure sensors, namely P1, P2, P3, and P4. Among them, pressure sensors P1, P2, and P3 are respectively installed at the relevant pipeline positions of the dynamic pressure system and the test product to detect the hydraulic medium pressure at the corresponding positions. Differential pressure sensor P4 is installed between the oil inlet and oil outlet pipelines of the test product, with its high-pressure end connected to the oil inlet pipeline of the test product and its low-pressure end connected to the oil outlet pipeline of the test product, to detect the pressure difference between the inlet and outlet of the test product. By installing multiple pressure sensors and differential pressure sensors in the system, comprehensive monitoring of the system pressure status and differential pressure characteristics of the test product during the test can be achieved.

[0013] During the hydraulic valve flow resistance test, the dynamic pressure system provides a stable test flow rate to the test product through a remotely controlled throttle valve. The flow meter is used to detect the test flow rate, and pressure sensors P1, P2, and P3 are used to monitor pressure changes at key system nodes to ensure the stability of the test conditions. Simultaneously, the differential pressure sensor P4 detects the pressure difference between the inlet and outlet sides of the test product in real time, thus directly reflecting the flow resistance characteristics of the test product under the current flow conditions. By coordinating the pressure sensors P1 to P3 with the differential pressure sensor P4, the accuracy of pressure difference measurement and the consistency of test data during the flow resistance test can be improved while ensuring the safe operation of the system.

[0014] Needle valve 101 and needle valve 102 are installed at the pipeline connecting the test product and the test bench. Needle valve 101 is located between the test product and the test bench pipeline to isolate and control the test product, and to enable independent control of the test product during test preparation, product installation or replacement. It can also be used with a pressure testing connector to detect the pressure status of the test product. Needle valve 102 is located on the oil inlet pipeline of the test product to finely adjust the flow rate of the test medium entering the test product, so as to achieve smooth loading during dynamic pressure test or static pressure test, and prevent the test product from being impacted by sudden changes in flow or pressure, thereby improving the safety of the test process and the stability of the test data.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model integrates a dynamic pressure system and a static pressure system within the same frame, enabling the test bench to perform flow resistance tests on hydraulic valves under dynamic pressure conditions and sealing tests under static pressure conditions. This allows for comprehensive testing of multiple key performance characteristics of hydraulic valves using a single device. Compared to existing testing methods that require separate flow resistance and sealing test equipment, this utility model reduces the number of test devices, lowers equipment costs and floor space requirements, and improves the overall efficiency of the hydraulic valve testing process. It is suitable for applications such as design verification and factory testing of hydraulic valve products.

[0016] 2. Under centralized oil supply conditions, this utility model enables the test bench to stably obtain the required test pressure and flow rate by rationally configuring the main oil circuit, bypass return branch, and return oil system of the dynamic pressure system, while ensuring the safety and reliability of system operation. At the same time, by setting up a remote control throttle valve for large flow rate adjustment and a throttle valve for small flow rate adjustment, and cooperating with multiple independent flow detection branches, a wide range of flow rate adjustment and measurement is achieved. This not only meets the requirements of dynamic pressure flow resistance test for flow rate adjustment accuracy, but also adapts to the testing needs of hydraulic valves of different specifications, making the system highly versatile and adaptable.

[0017] 3. This utility model incorporates multiple pressure sensors and differential pressure sensors in the system to monitor the pressure at key system nodes and the pressure difference between the inlet and outlet of the test product in real time, thereby improving the accuracy and consistency of pressure and differential pressure measurements during the flow resistance test. Simultaneously, the static pressure system employs a hand-operated pump combined with a check valve and a high-pressure needle valve to pressurize and maintain pressure on the test product, achieving stable and reliable static pressure loading and avoiding the impact of pressure fluctuations on the sealing test results. This ensures test safety while improving the reliability and repeatability of test data. Attached Figure Description

[0018] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a schematic diagram illustrating the principle of this utility model.

[0019] In the diagram: 1. Ball valve I; 2. Filter I; 3. Proportional pressure reducing valve; 4. Temperature sensor; 5. Pressure sensor; 6. Shut-off valve; 7.1 Remote control throttle valve I; 7.2 Remote control throttle valve II; 7.3 Remote control throttle valve III; 8. Electro-hydraulic directional valve; 9. Throttle valve I; 10.1 Needle valve I; 10.2 Needle valve II; 11.1 Pressure test connector I; 11.2 Pressure test connector II; 11.3 Pressure test connector III; 12. Ball valve II; 13. Hand pump; 14. Check valve I; 15.1 High-pressure needle valve I; 15.2 High-pressure needle valve II; 16. Flow meter I; 17. Flow meter II; 18. Flow meter III; 19.1 Check valve II; 19.2 Check valve III; 20. Throttle valve II; 21. Check valve IV; 22. Electric pump; 23. Ball valve III; 24. Air filter; 25. Liquid level sensor; 26. Needle valve III; 27. Ball valve IV; 28. Filter II; 29. ​​Check valve V. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0021] Please see Figure 1-3This utility model provides a technical solution: a hydraulic flow test bench, including a dynamic pressure system, a static pressure system, a return oil system, a centralized oil source and an oil tank integrated in the same frame; each system is arranged inside the bench body through valve block integration and pipeline connection, making the test bench compact, occupying little space, and easy to use in production site or laboratory environment.

[0022] The oil tank is located inside the platform and is equipped with an air filter 24 for air filtration when the oil tank is connected to the outside. The oil tank is connected to the level sensor 25 through needle valve 3 26 for monitoring the oil level in the tank. The oil tank is connected to the dynamic pressure system in sequence through ball valve 3 23, electric pump 22 and check valve 4 21. The electric pump 22 is used to provide the hydraulic medium required for the test to the dynamic pressure system, and the check valve 4 21 is used to prevent oil backflow.

[0023] like Figure 3 As shown, the dynamic pressure system includes an oil supply line connected downstream of the one-way valve 21; the oil supply line is connected sequentially from upstream to downstream to ball valve 1, filter 2 and proportional pressure reducing valve 3, which are used to control the opening and closing, filter and regulate the pressure of the hydraulic medium entering the dynamic pressure system; the proportional pressure reducing valve 3 is used to regulate the system pressure to the range required for the test, and downstream of it are temperature sensor 4, pressure sensor 5 and shut-off valve 6, forming a continuous main oil circuit of the dynamic pressure system downstream of shut-off valve 6.

[0024] A bypass return branch is provided on the main oil line of the hydrodynamic system. This bypass return branch is connected in sequence to remote control throttle valve 1 71 and / or remote control throttle valve 2 72, ball valve 4 27, filter 2 28 and check valve 5 29, and is connected to the oil tank. Check valve 5 29 is configured to allow oil to flow unidirectionally from the side of filter 2 28 to the side of the oil tank, so as to prevent oil in the oil tank from flowing back into the hydrodynamic system.

[0025] The main oil circuit of the dynamic pressure system is also equipped with a product oil supply branch for supplying oil to the test product. The product oil supply branch is equipped with a remote control throttle valve 3 73 for regulating the test flow rate entering the test product. Downstream of the remote control throttle valve 3 73, there are two independent detection branches. One detection branch is connected in sequence to a check valve 2 191 and a flow meter 1 16, and the other detection branch is connected in sequence to a check valve 3 192 and a flow meter 2 17 for detecting the test flow rate under different flow conditions.

[0026] In addition, a small flow rate regulating branch is also provided on the main oil circuit of the hydrodynamic system. The small flow rate regulating branch is connected to the oil tank, and throttle valve 20 and flow meter 318 are connected in sequence from the oil tank to achieve fine regulation and measurement under small flow rate conditions.

[0027] The hydrostatic system in this embodiment includes an oil tank, a ball valve 12 connected to the oil tank, a hand pump 13 located downstream of the ball valve 12, and a check valve 14 located on the oil outlet side of the hand pump 13. Downstream of the check valve 14 are a high-pressure needle valve 151 and a high-pressure needle valve 152 connected in sequence, wherein the high-pressure needle valve 151 is located between the oil tank and the high-pressure needle valve 152, and the high-pressure needle valve 152 is connected to the oil inlet pipeline of the test product.

[0028] During the sealing test, pressure is applied to the test product by manually operating the hand pump 13, and the pressurization and pressure holding process is precisely controlled by the high-pressure needle valve 151 and the high-pressure needle valve 152 to achieve stable and reliable static pressure loading.

[0029] The oil outlet line of the test product is connected to the electro-hydraulic directional valve 8. The P port of the electro-hydraulic directional valve 8 is connected upstream of the remote control throttle valve 71. Its B port is connected to the oil tank through the throttle valve 9, and its T port is connected to the oil tank. This is used to realize the return oil control of the test product under different test conditions.

[0030] Pressure test connector 111, pressure test connector 212, and pressure test connector 313 are respectively installed on the oil inlet and outlet lines of the test product for pressure testing or calibration.

[0031] The hydraulic system of the test bench is also equipped with four differential pressure sensors, namely P1, P2, P3 and P4. Among them, pressure sensors P1, P2 and P3 are respectively installed at the relevant pipeline positions of the dynamic pressure system and the test product to detect the pressure at key nodes of the system. Differential pressure sensor P4 is installed between the oil inlet and oil outlet pipelines of the test product. Its high-pressure end is connected to the oil inlet pipeline of the test product and its low-pressure end is connected to the oil outlet pipeline of the test product to detect the pressure difference between the inlet and outlet of the test product.

[0032] In addition, needle valve 101 and needle valve 2 102 are installed at the pipeline connecting the test product and the test bench. Needle valve 101 is used to isolate and control the test product and to perform pressure detection in conjunction with the pressure measuring connector. Needle valve 2 102 is used to finely adjust the flow rate of the test medium entering the test product in order to achieve smooth loading during the dynamic pressure test and static pressure test.

[0033] During the hydraulic valve flow resistance test, the dynamic pressure system provides a stable test flow to the test product through a remote control throttle valve. The flow meter detects the test flow, pressure sensors P1 to P3 monitor the system pressure status, and differential pressure sensor P4 detects the pressure difference between the inlet and outlet of the test product in real time, thereby obtaining the flow resistance characteristics of the hydraulic valve.

[0034] When conducting a hydraulic valve sealing test, the dynamic pressure system is shut off, and the test product is pressurized and maintained using a hand-cranked pump in the static pressure system to test the sealing performance of the test product under static pressure conditions.

[0035] Under centralized oil supply conditions, this utility model achieves switching and independent operation of hydraulic valve flow resistance test and sealing test through the coordinated setting of dynamic pressure system and static pressure system. During dynamic pressure flow resistance test, hydraulic medium enters the dynamic pressure system oil supply pipeline from oil tank through ball valve 23, electric pump 22 and check valve 21. After passing through ball valve 1 and filter 2 for opening and closing control and impurity filtration, it enters proportional pressure reducing valve 3. The proportional pressure reducing valve 3 adjusts the system pressure to the required range for the test. After the hydraulic medium is pressure-regulated, it enters the main oil circuit of dynamic pressure system through shut-off valve 6 after the temperature sensor 4 and pressure sensor 5 monitor its status.

[0036] In the main oil circuit of the hydrodynamic system, some hydraulic medium can enter the bypass return branch through remote control throttle valve 1 71 and / or remote control throttle valve 2 72, and then return to the oil tank through ball valve 4 27, filter 2 28 and check valve 5 29, thereby achieving auxiliary regulation of system pressure and flow, while preventing oil backflow.

[0037] When it is necessary to supply oil to the test product, the hydraulic medium enters the product oil supply branch through the remote control throttle valve 373, and then enters the detection branch equipped with check valve 2191 and flow meter 16, check valve 3192 and flow meter 217 respectively, so as to realize the detection of the test flow rate; under low flow conditions, the hydraulic medium can be finely adjusted through throttle valve 220 and flow meter 318.

[0038] During the test, pressure sensor 5 and pressure detection elements located in other parts of the system are used to monitor the system pressure status. The differential pressure sensor located between the oil inlet and outlet lines of the test product is used to detect the pressure difference between the inlet and outlet of the test product, thereby obtaining the flow resistance characteristics of the hydraulic valve under different flow conditions. The return oil of the test product is switched by the electro-hydraulic directional valve 8 and flows back to the oil tank through the throttle valve 9 or the T port.

[0039] During the static pressure sealing test, the dynamic pressure system is shut off, and the hydraulic medium in the oil tank is introduced into the hand pump 13 through ball valve 12. The hand pump 13 applies static pressure to the system, and the hydraulic medium enters the high-pressure needle valve 151 and high-pressure needle valve 152 through check valve 14. The high-pressure needle valve is adjusted to achieve stable pressure increase and reliable pressure holding, so as to test the sealing performance of the test product under static pressure conditions. Through the above working process, this utility model realizes efficient switching and stable operation of dynamic pressure flow resistance test and static pressure sealing test on the same test bench.

[0040] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A hydraulic flow test bench, comprising a dynamic pressure system, a static pressure system, a return oil system, a centralized oil source, and an oil tank integrated within the same frame, characterized in that: The oil tank is connected to the dynamic pressure system in sequence via ball valve three (23), electric pump (22) and check valve four (21); an air filter (24) is installed on the oil tank, and the oil tank is connected to the liquid level sensor (25) via needle valve three (26); The dynamic pressure system includes an oil supply line connected downstream of the one-way valve four (21). The oil supply line is connected in sequence to a ball valve one (1), a filter one (2), and a proportional pressure reducing valve (3). Downstream of the proportional pressure reducing valve (3) are a temperature sensor (4), a pressure sensor (5), and a shut-off valve (6). Downstream of the shut-off valve (6) forms a continuously arranged main oil circuit of the dynamic pressure system. The main oil line of the dynamic pressure system is provided with a bypass return branch, which is connected in sequence to remote control throttle valve one (71) and / or remote control throttle valve two (72), ball valve four (27), filter two (28) and check valve five (29), and is connected to the oil tank; The main oil line of the dynamic pressure system is provided with a product oil supply branch for supplying oil to the test product. The product oil supply branch is provided with a remote control throttle valve three (73). Downstream of the remote control throttle valve three (73), there are two independent detection branches. One detection branch is connected in sequence to a one-way valve two (191) and a flow meter one (16), and the other detection branch is connected in sequence to a one-way valve three (192) and a flow meter two (17). The main oil line of the dynamic pressure system is provided with a small flow rate regulating branch, which is connected to the oil tank and connected in sequence from the oil tank to the flow meter three (18); the static pressure system includes an oil tank, a ball valve two (12) connected to the oil tank, a hand pump (13) located downstream of the ball valve two (12), and a check valve one (14) located on the oil outlet side of the hand pump (13). Downstream of the check valve one (14), a high pressure needle valve one (151) and a high pressure needle valve two (152) are connected in sequence. The high pressure needle valve one (151) is located between the oil tank and the high pressure needle valve two (152), and the high pressure needle valve two (152) is connected to the oil inlet pipeline of the test product; The oil outlet pipeline of the test product is connected to the electro-hydraulic directional valve (8). The P port of the electro-hydraulic directional valve (8) is connected upstream of the remote control throttle valve (71). The B port of the electro-hydraulic directional valve (8) is connected to the oil tank via the throttle valve (9). The T port of the electro-hydraulic directional valve (8) is connected to the oil tank. Pressure test connector 1 (111), pressure test connector 2 (112), and pressure test connector 3 (113) are respectively provided on the oil inlet pipeline and oil outlet pipeline of the test product.

2. The hydraulic flow test bench according to claim 1, characterized in that: The proportional pressure reducing valve (3) is used to adjust the system pressure to the range of 0 to 31.5 MPa.

3. The hydraulic flow test bench according to claim 1, characterized in that: The remote-controlled throttle valve three (73) is used for flow regulation from 10 L / min to 150 L / min, and the throttle valve two (20) is used for small flow regulation from 0 to 10 L / min.

4. A hydraulic flow test bench according to claim 1, characterized in that: The dynamic pressure system is used to conduct flow resistance tests on the test product, and the static pressure system is used to conduct sealing tests on the test product, so that the same test bench can perform performance tests on the test product under both dynamic and static pressure conditions.

Images