Hydraulic system for precision hydraulic valve performance test

Abstract

The invention relates to a hydraulic system for testing the performance of a precision hydraulic valve, and belongs to the field of experimental equipment. A hydraulic system for precision hydraulic valve performance testing is characterized in that the hydraulic system comprises a main oil way, an auxiliary oil way, an oil distribution module and an oil storage module, and the main oil way comprises a quantitative hydraulic pump, a pilot overflow valve, a flow regulating valve, a flow sensor and a pressure vibration suppression module; the auxiliary oil way comprises a quantitative hydraulic pump, a pilot overflow valve and a flow regulating valve; the oil distribution module comprises an oil way connecting block and an oil discharge confluence plate; the oil storage module comprises an oil tank, an oil suction filter, an oil return filter and an oil cooler. Modular design is adopted, the modules are connected through the standard hydraulic connectors, a power liquid pressure source and a control liquid pressure source which are stable in flow, pressure and temperature can be provided for a precision hydraulic valve performance test, and the device has the advantages of being high in interchangeability and expandability, convenient to use and stable in performance.

Description

Technical Field

[0001] The invention relates to the field of precision hydraulic oil sources and hydraulic valve testing tools, in particular to a hydraulic system for precision hydraulic valve performance testing. Background Art

[0002] Hydraulic transmission has many advantages such as high power density, flexible layout, and high control accuracy, and is widely used in various electromechanical systems. The hydraulic valve is an important control element of the hydraulic system. Its performance directly affects the performance of the hydraulic system and is an indispensable element of the hydraulic system. In the vehicle suspension, the precision hydraulic valve is an important element to realize the damping control of the suspension. Its excellent performance indicators and stable working characteristics are the basis for realizing the intelligentization of the vehicle chassis. Therefore, the performance of the precision hydraulic valve is directly related to the control accuracy of the vehicle suspension and even the driving safety. Then the detection of the performance indicators of the precision hydraulic valve is an indispensable link in the design and production of the hydraulic valve. Through the performance detection of the precision hydraulic valve and the analysis of various performance indicators, the design of the precision hydraulic valve can be guided and its production efficiency can be improved.

[0003] Among the existing technical achievements, hydraulic valve performance testing tools are generally designed for industrial hydraulic components. In order to cooperate with the precision hydraulic valve performance testing tools that monitor the valve core status and enable them to work normally and stably, a hydraulic system is designed that can accurately control the pressure oil and ensure stable oil pressure output. Summary of the invention

[0004] The purpose of the present invention is to design a hydraulic system to cooperate with a hydraulic control device for the normal operation of a precision hydraulic valve performance test tool that monitors the valve core state with high precision, thereby achieving precise control of pressure oil, ensuring oil pressure stability, and reducing experimental errors.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a hydraulic system for precision hydraulic valve performance testing, including a main oil pump 102 and an auxiliary oil pump 202, pilot relief valves 104, 114, 204, pressure gauges 105, 205, flow regulating valves 106, 206, flow sensors 111, oil circuit connection blocks 301, oil drain manifolds 302, air-cooled radiators 402, 403, oil tanks 401, return oil filters 101, 201, check valves 112, and diaphragm accumulators 113; The oil inlet of the filter 101 is immersed below the liquid level of the oil tank 401, the oil outlet of the filter 101 is connected to the oil inlet of the main oil pump 102, and the oil outlet of the main oil pump 102 is connected to the oil inlet of the pilot relief valve 104; The oil outlet of the pilot relief valve 104 is communicated with the oil inlet of the flow control valve 106 and the oil drain manifold 302 respectively; The oil outlet of the flow regulating valve 106 is communicated with the oil inlet of the flow sensor 111, and the oil outlet of the flow sensor 111 is communicated with the oil inlet of the one-way valve 112; The oil outlet of the one-way valve 112 is communicated with the oil inlet of the diaphragm accumulator 113 and the pilot relief valve 114 respectively, and the oil outlet of the pilot relief valve 114 is communicated with the oil inlet of the oil circuit connection block 301; The oil inlet of the filter 201 is immersed below the liquid level of the oil tank 401, the oil outlet of the filter 201 is connected to the oil inlet of the auxiliary oil pump 202, the oil outlet of the auxiliary oil pump 202 is connected to the oil inlet of the pilot relief valve 204, the oil outlet of the pilot relief valve 204 is respectively connected to the oil inlets of the flow control valve 206 and the oil drain manifold 302, and the oil outlet of the flow control valve 206 is connected to the oil inlet of the oil circuit connection block 301; The oil outlet of the oil connection block 301 is connected to the oil inlet of the experimental device 5 and the oil drain manifold 302 respectively; The oil outlet of the experimental device 5 is connected to the oil inlet of the oil circuit connection block 301, and the oil outlet of the oil circuit connection block 301 is connected to the oil inlet of the oil drain manifold 302; The oil outlet of the oil drain manifold 302 is connected to the oil inlet of the air-cooled radiator 403, 402, and the oil outlet of the air-cooled radiator 403, 402 is connected to the oil tank 401 through a pipeline; The utility model is characterized in that the pilot relief valves 104 and 204 are used to ensure the safety and stability of the oil circuit, and the flow control valves 106 and 206 and the flow sensor 111 are used to control and monitor the required flow of the oil circuit; the main and auxiliary oil circuits are established by the main and auxiliary oil pumps, and each of the main and auxiliary oil circuits has a branch oil circuit, and the oil pressure of the main and auxiliary oil circuits is balanced by the oil discharge manifold and the oil circuit.

[0006] The advantages of the present invention are: designing a hydraulic system to cooperate with a hydraulic control device for a precision hydraulic valve performance test tool that monitors the valve core state with high precision to achieve accurate regulation of pressure oil, ensure oil pressure stability, and reduce experimental errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the principle of a hydraulic system for precision hydraulic valve performance testing involved in the present invention; Figure 2 It is a structural schematic diagram of a hydraulic valve performance comprehensive testing system according to the present invention; Figure 3 A three-dimensional design diagram of a hydraulic valve performance comprehensive testing system according to the present invention; Figure 4 This is a diagram of an actual device of a hydraulic valve performance comprehensive testing system according to the present invention; Figure 5 This is the schematic diagram of the pressure vibration suppression module.

[0008] In the figure: 1 main oil circuit, 2 auxiliary oil circuit, 3 oil distribution module, 4 oil storage module, 5 experimental device, 11 pressure vibration suppression module, 101 filter, 102 main oil pump, 103 main oil pump motor, 104 pilot relief valve, 105 pressure gauge, 106 flow control valve, 111 flow sensor, 112 check valve, 113 diaphragm accumulator, 114 pilot relief valve, 201 filter, 202 auxiliary oil pump, 203 auxiliary oil pump motor, 204 pilot relief valve, 205 pressure gauge, 206 flow control valve, 301 oil circuit connection block, 302 oil drain manifold, 401 oil tank, 402 air-cooled radiator, 403 air-cooled radiator. DETAILED DESCRIPTION

[0009] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0010] The orientation or positional relationship indicated by "upper", "lower", "top", "bottom", "inside", "outside" and the like in the embodiments of the present application is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "including", "provided with", "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0011] In addition to the above, it is still necessary to emphasize that the reference to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0012] See also Figure 1 , a hydraulic system for precision hydraulic valve performance testing, including a main oil pump 102 and an auxiliary oil pump 202, pilot relief valves 104, 114, 204, pressure gauges 105, 205, flow regulating valves 106, 206, flow sensors 111, oil circuit connection blocks 301, oil drain manifolds 302, air-cooled radiators 402, 403, oil tanks 401, return oil filters 101, 201, check valves 112, and diaphragm accumulators 113; The oil inlet of the filter 101 is immersed below the liquid level of the oil tank 401, the oil outlet of the filter 101 is connected to the oil inlet of the main oil pump 102, and the oil outlet of the main oil pump 102 is connected to the oil inlet of the pilot relief valve 104; The oil outlet of the pilot relief valve 104 is connected to the oil inlet of the flow control valve 106 and the oil drain manifold 302 respectively. The oil outlet of the flow regulating valve 106 is communicated with the oil inlet of the flow sensor 111, and the oil outlet of the flow sensor 111 is communicated with the oil inlet of the one-way valve 112; The oil outlet of the one-way valve 112 is communicated with the oil inlet of the diaphragm accumulator 113 and the pilot relief valve 114 respectively, and the oil outlet of the pilot relief valve 114 is communicated with the oil inlet of the oil circuit connection block 301; The oil inlet of the filter 201 is immersed below the liquid level of the oil tank 401, the oil outlet of the filter 201 is connected to the oil inlet of the auxiliary oil pump 202, the oil outlet of the auxiliary oil pump 202 is connected to the oil inlet of the pilot relief valve 204, the oil outlet of the pilot relief valve 204 is respectively connected to the oil inlets of the flow control valve 206 and the oil drain manifold 302, and the oil outlet of the flow control valve 206 is connected to the oil inlet of the oil circuit connection block 301; The oil outlet of the oil connection block 301 is connected to the oil inlet of the experimental device 5 and the oil drain manifold 302 respectively; The oil outlet of the experimental device 5 is connected to the oil inlet of the oil circuit connection block 301, and the oil outlet of the oil circuit connection block 301 is connected to the oil inlet of the oil drain manifold 302; The oil outlet of the oil drain manifold 302 is connected to the oil inlet of the air-cooled radiator 403, 402, and the oil outlet of the air-cooled radiator 403, 402 is connected to the oil tank 401 through a pipeline; The utility model is characterized in that the pilot relief valves 104 and 204 are used to ensure the safety and stability of the oil circuit, and the flow control valves 106 and 206 and the flow sensor 111 are used to control and monitor the required flow of the oil circuit; the main and auxiliary oil circuits are established by the main and auxiliary oil pumps, and each of the main and auxiliary oil circuits has a branch oil circuit, and the oil pressure of the main and auxiliary oil circuits is balanced by the oil discharge manifold and the oil circuit.

[0013] The working principle of the present invention is: The hydraulic oil in the main oil circuit passes through the filter 101 and is pressed into the pilot relief valve 104 by the main oil pump 102 driven by the main motor 103, and flows through the flow control valve 106 through the branch 1. The flow control valve 106 controls the flow size of the branch 1, and the flow size is monitored by the flow sensor 111. The oil flows into the pressure vibration suppression module, and then flows into the oil circuit connection block 301 to enter the experimental device 5, and then returns to the oil circuit connection block 301, and finally flows into the oil drain manifold 302, is cooled by the oil coolers 403 and 402, and then flows into the oil tank 401; it flows directly into the oil drain manifold 302 through the branch 2, and then flows into the oil tank 401 after being cooled. The hydraulic oil in the auxiliary oil circuit passes through the filter 201 and is pressed into the pilot overflow valve 204 by the auxiliary oil pump 202 driven by the auxiliary motor 203, flows through the flow control valve 206 through the branch 3, and the flow control valve 206 controls the flow size of the branch 3, and then flows into the oil circuit connection block 301 to enter the experimental device 5, and then returns to the oil circuit connection block 301, and finally flows into the oil drain manifold 202 to be cooled and then flows into the oil tank 401; it directly flows into the oil drain manifold 202 through the branch 4, is cooled by the oil coolers 403 and 402, and then flows into the oil tank 401.

[0014] The displacement of the main oil pump 102 is 35.6 cm³ / rev, including but not limited to this displacement, and the displacement of the auxiliary oil pump 202 is 10.5 cm³ / rev, including but not limited to this displacement.

[0015] In one embodiment of the present invention, the main oil pump, pilot relief valve, pressure gauge, flow control valve, flow sensor, oil circuit connection block, oil drain manifold, air-cooled radiator, oil tank, and oil return filter used are all finished products. The main pump motor power is 15KW, and the auxiliary pump motor power is 2.2KW. The present invention can provide stable and accurate pressure through dual oil circuits, reduce experimental errors, and achieve accurate regulation of pressure oil through a flow regulator to ensure stable oil pressure.

[0016] The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A hydraulic system for precision hydraulic valve performance testing, characterized in that It includes a main oil circuit responsible for the system oil supply function, a secondary oil circuit responsible for the auxiliary function, an oil distribution module responsible for the connection function, and an oil storage module responsible for the storage function.

2. A hydraulic system for precision hydraulic valve performance testing according to claim 1, characterized in that: The main and auxiliary oil circuits are two independent hydraulic circuits. When one of the oil circuits has a problem and cannot be used, the other oil circuit can continue to provide stable hydraulic power for the hydraulic system.

3. A hydraulic system for precision hydraulic valve performance testing according to claim 1, characterized in that: The main and auxiliary oil circuits both include a quantitative hydraulic pump, a pilot relief valve, a flow regulating valve, a flow sensor and a pressure vibration suppression module.

4. A hydraulic system for precision hydraulic valve performance testing according to claim 3, characterized in that: The quantitative hydraulic pump is connected to the oil tank and the pilot relief valve respectively, and is used to discharge the oil in the oil tank into pressurized oil. The quantitative hydraulic pump includes but is not limited to a vane pump, a gear pump, a plunger pump and a screw pump.

5. A hydraulic system for precision hydraulic valve performance testing according to claim 3, characterized in that: The pilot relief valve is connected to the quantitative hydraulic pump and the flow regulating valve respectively, and overflows the high-pressure pressure oil from the hydraulic pump to maintain the main oil circuit pressure stable.

6. A hydraulic system for precision hydraulic valve performance testing according to claim 3, characterized in that: The flow regulating valve is connected to the pilot relief valve and the flow sensor respectively, and is used to accurately adjust the flow of the pressure oil in the oil circuit. The flow sensor is used to detect the flow in the oil circuit and feedback the flow information in the oil circuit.

7. A hydraulic system for precision hydraulic valve performance testing according to claim 3, characterized in that: The pressure vibration suppression module comprises a one-way valve, a diaphragm accumulator, and a pilot relief valve. The pressure vibration suppression module is respectively connected to a flow sensor and an oil circuit connection block to suppress the pressure variation amplitude of the hydraulic system.

8. The hydraulic system for precision hydraulic valve performance testing according to claim 1, characterized in that: The oil distribution module includes an oil circuit connection block and an oil drain manifold. The oil circuit connection block is equipped with a high-pressure quick connector for realizing rapid disassembly and assembly of the experimental circuit. The oil drain manifold is respectively connected to the main oil circuit, the auxiliary oil circuit, and the oil circuit connection block for realizing unified oil supply and unified oil drain.

9. A hydraulic system for precision hydraulic valve performance testing according to claim 1, characterized in that: The oil storage module includes an oil tank, a filter, an oil cooler and a thermometer; the filter is used to filter impurities in the oil, the thermometer is used to monitor the temperature of the hydraulic oil in the oil tank in real time, and the oil cooler is used to reduce the temperature transmitted to the hydraulic oil during oil transmission.

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