Energy-saving test system for high-pressure hydraulic motor

Abstract

The invention relates to the technical field of hydraulic pressure, and discloses an energy-saving test system for a high-pressure hydraulic motor, which comprises an oil tank, an oil supplementing unit, an oil tank oil temperature adjusting unit, a test loop, a motor power recovery unit and a performance test unit. The test system adopts a closed loop, and the test mode of the motor is switched by rotating the workbench. When the durability of the motor is tested, the rotary workbench is adjusted to connect the output shaft of the high-voltage motor with the main motor, and the output shaft work of the motor is recovered; when other performances of the motor are tested, the rotary workbench is adjusted to enable the output shaft of the high-voltage motor to be connected with the magnetic powder brake, and other test items of the high-voltage motor can be tested. The high-pressure variable pump is used for testing high-pressure motors with different displacement specifications. The oil supplementing unit is used for reducing unnecessary oil supplementing to achieve the energy-saving effect. The oil liquid is heated or cooled through the air energy heat pump, and compared with a traditional temperature adjusting mode, more energy is saved. The problem that the existing test technical scheme is difficult to meet the requirements of energy conservation and cost reduction is solved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic technology, and in particular to an energy-saving testing system for high-pressure hydraulic motors. Background Technology

[0002] Hydraulic motors are crucial actuators in hydraulic systems, converting the pressure energy of fluids into rotational mechanical energy. Currently, hydraulic motors are evolving towards higher pressure designs. During the development phase, high-pressure hydraulic motors undergo various experiments. According to the JB / T 10829-2008 hydraulic motor standard, new product trial production and finalization require type testing and durability testing. Motor type testing includes numerous tests such as efficiency testing, variable characteristic testing, starting efficiency testing, low-speed performance testing, overspeed testing, and overload testing. Durability testing is also necessary, typically exceeding 1000 hours. Since high-pressure motors consume significant energy during this testing process, effectively recovering the output power of high-pressure motors can reduce emissions and lower costs.

[0003] Patent application CN204716666U describes a durability testing device for a hydraulic pump and hydraulic motor based on power recovery and parallel energy-saving technology. This technical solution utilizes a hydraulic pump to generate high-pressure oil to drive the tested hydraulic motor to rotate. The tested hydraulic motor then transmits its rotational shaft power to another hydraulic pump, thereby achieving motor power recovery. This technical solution has a relatively simple function, mainly used for power recovery in durability testing of multiple hydraulic pumps and hydraulic motors, and is not suitable for type testing of hydraulic motors.

[0004] Patent application CN107327430B describes a hydraulic integrated power recovery testing system. This system utilizes a main pump to generate high-pressure oil to drive a test motor. The test motor is connected to a loading motor, and the loading motor's rotation generates high-pressure oil, which in turn drives a power recovery motor. The power recovery motor is then rigidly connected to the main pump, thereby recovering a portion of the test motor's output power. However, this system involves multiple conversions of the test motor's output power before it is transmitted to the main pump, resulting in power loss at each conversion and low recovery efficiency.

[0005] Patent application CN219197788 describes a hydraulic test bench with power recovery. This solution uses a generator to load a motor and then uses the motor's output power to generate electricity. Using a generator for loading and power recovery requires high-power variable frequency motors, frequency converters, rectifiers, and inverters, resulting in high costs.

[0006] The patent application document with patent publication number CN101871478A describes a loading device for a hydraulic motor test bench. This technical solution connects the loading motor and the high-pressure oil pump to recover a portion of the hydraulic power, but it cannot test the low-speed performance and starting efficiency of the motor, and its testing function is relatively limited.

[0007] Furthermore, type testing of motors requires specific hydraulic oil temperatures. According to the JB / T 10829-2008 standard, the inlet temperature of the motor for overspeed and overload tests must be maintained between 30℃ and 60℃ during continuous operation. Traditional testing systems use resistance wire heating for the hydraulic oil, which consumes a large amount of electricity.

[0008] In summary, existing motor testing technologies suffer from low power recovery efficiency, high cost, limited testing functionality, and high energy consumption. Currently, hydraulic motors are trending towards higher pressures, increasing the power consumption required for testing. Existing technologies struggle to meet the demands for energy conservation and cost reduction. Therefore, it is necessary to propose a high-pressure motor testing system that is highly energy-efficient, offers multiple testing functions, has a simple structure, and is cost-effective. This system should meet the needs of high-pressure motor R&D and mass production testing while effectively reducing testing costs. Summary of the Invention

[0009] The purpose of this invention is to provide an energy-saving testing system for high-pressure hydraulic motors, which solves the problem that existing testing technologies cannot meet the requirements of energy saving and cost reduction.

[0010] To achieve the above objectives, the technical solution of the present invention is as follows: In a first aspect, the present invention discloses an energy-saving testing system for a high-pressure hydraulic motor, characterized in that it includes an oil tank unit, an oil replenishment unit, an oil tank temperature regulation unit, a test circuit, a motor power recovery unit, and a performance testing unit.

[0011] As an optional solution, the fuel tank unit includes: a fuel tank and a fifth temperature sensor; The fifth temperature sensor is installed on the oil tank.

[0012] As an optional solution, the oil replenishment unit includes a variable oil replenishment pump, a first motor, a first check valve, a first filter, a low-pressure relief valve, and a fourth low-pressure flow meter; The inlet of the variable oil pump is connected to the oil tank, and the outlet is connected to the inlet of the first check valve. The drive shaft of the variable oil replenishment pump is connected to the output shaft of the first motor; The oil outlet of the first check valve is connected to the oil inlet of the first filter; The oil outlet of the first filter is connected to the oil inlet of the first heat exchanger, and the oil outlet of the first filter is also connected in sequence to the low-pressure relief valve, the fourth low-pressure flow meter and the oil tank.

[0013] As an optional solution, the oil tank oil temperature regulating unit includes a circulating oil pump, a second motor, a second one-way valve, a sixth filter, a second heat exchanger, and a second air source heat pump; The oil inlet of the circulating oil pump is connected to the oil tank, the oil outlet is connected to the oil inlet of the second check valve, and the drive shaft of the circulating oil pump is connected to the output shaft of the second motor. The oil outlet of the second check valve is connected to the oil inlet of the sixth filter; The oil outlet of the sixth filter is connected to the heat exchange oil inlet of the second heat exchanger; The heat exchange outlet of the second heat exchanger is connected to the oil tank, and the second heat exchanger is also connected to the second air-source heat pump.

[0014] As an optional solution, the test circuit and motor power recovery unit includes a third one-way valve, a second filter, a third filter, a fourth filter, a fifth filter, a first heat exchanger, a first air-source heat pump, a high-pressure variable oil pump, a high-pressure flow meter, a first pressure gauge, a second pressure gauge, a third pressure gauge, a first thermometer, a second thermometer, a third thermometer, a fourth thermometer, a main motor, a first coupling, a second coupling, a first torque meter, a first tachometer, a high-pressure motor under test, a high-pressure relief valve, a first low-pressure flow meter, a second low-pressure flow meter, a third low-pressure flow meter, a coupling, a rotary table, and a back pressure regulating valve. The heat exchange oil inlet of the first air source heat pump is connected to the oil outlet of the first filter, and the heat exchange oil outlet of the first air source heat pump is connected to the oil inlet of the high-pressure variable oil pump. The outlet of the high-pressure variable oil pump is connected to the inlet of the third check valve. The oil outlet of the third check valve is connected to the oil inlet of the high-pressure flow meter, the oil outlet of the high-pressure flow meter is connected to the oil inlet of the high-pressure motor under test, the oil outlet of the high-pressure motor under test is sequentially connected to the oil inlet of the back pressure regulating valve and the fifth filter, and the oil outlet of the fifth filter is connected to the oil inlet of the first heat exchanger. The outlet of the high-pressure variable oil pump is connected in sequence to the high-pressure overflow valve, the third filter, the oil port of the third low-pressure flow meter and the oil tank. The drain port of the high-pressure variable oil pump is connected in sequence to the second filter, the oil port of the second low-pressure flow meter and the oil tank. The drive shaft of the high-pressure variable oil pump is connected in sequence to the first torque meter, the first tachometer, the main motor and the first coupling. The oil inlet of the tested high-pressure motor is equipped with a first pressure gauge and a first thermometer, the oil outlet of the tested high-pressure motor is equipped with a second pressure gauge and a second thermometer, the oil drain port of the tested high-pressure motor is connected in sequence to a fourth filter, a first low-pressure flow meter and an oil tank, and the oil drain port of the tested high-pressure motor is also equipped with a third pressure gauge and a third thermometer. The first heat exchanger is also equipped with a fourth thermometer at its oil inlet, and the output shaft of the high-pressure motor under test is equipped with a coupling. The high-pressure motor under test is mounted on a rotary table.

[0015] As an optional solution, the performance testing unit includes a second coupling, a second torque meter, a second tachometer, a phase meter, and a magnetic powder loader; The second coupling is connected in sequence to the second torque meter, the second tachometer, the phase meter, and the magnetic powder loader.

[0016] The present invention has the following unexpected beneficial effects: This invention provides an energy-saving testing system for high-pressure hydraulic motors. The system is high-pressure resistant, highly energy-efficient, simple and compact in structure, low in cost, and fully functional, and is suitable for performance testing of high-pressure motors with different displacement specifications.

[0017] The testing system includes an oil tank, an oil replenishment unit, an oil tank temperature regulation unit, a test circuit, a motor power recovery unit, and a performance testing unit. The testing system employs a closed-loop design, reducing unnecessary components on the high-voltage side of the motor and using mature, high-voltage resistant components. Infrequently used high-voltage components require custom manufacturing, resulting in higher costs; using mature, high-voltage resistant components reduces the manufacturing cost of the testing system.

[0018] Durability testing requires stable motor speed and load conditions over a long period, which is beneficial for motor power recovery. Other performance tests require variable motor speed and load conditions and shorter test times, and the corresponding motor loaders also have variable load requirements, which is not conducive to motor power recovery. By switching the motor's test mode using a rotary table, when testing motor durability, the rotary table is adjusted to connect the high-voltage motor's output shaft to the main motor, recovering the output shaft power; when testing other motor performance, the rotary table is adjusted to connect the high-voltage motor's output shaft to the magnetic powder brake, allowing for tests on high-voltage motor starting efficiency, low-speed performance, and other test items. A high-pressure variable pump can adjust the system's flow rate, enabling testing of high-voltage motors with different displacement specifications. The oil replenishment unit replenishes oil based on the amount discharged from the closed system, reducing unnecessary oil replenishment and achieving energy savings. Using an air-source heat pump to heat or cool the oil is more energy-efficient than traditional temperature control methods. This solves the problem that existing testing technologies cannot meet energy-saving and cost-reduction requirements. Attached Figure Description

[0019] Figure 1This is an overall schematic diagram of a testing system for a high-pressure hydraulic motor according to an embodiment of the present invention; In the diagram, 1. Oil tank; 2. Variable displacement oil pump; 3.1. First motor; 3.2. Second motor; 4.1. First check valve; 4.2. Second check valve; 4.3. Third check valve; 5.1. First filter; 5.2. Second filter; 5.3. Third filter; 5.4. Fourth filter; 5.5. Fifth filter; 5.6. Sixth filter; 6. Low-pressure relief valve; 7.1. First heat exchanger; 7.2. Second heat exchanger; 8.1. First air source heat pump; 8.2. Second air source heat pump; 9. High-pressure variable displacement oil pump; 10. High-pressure flow meter; 11.1. First pressure gauge; 11.2. Second pressure gauge; 11.3. Third pressure gauge; 12.1. First thermometer. 12.2 Second thermometer, 12.3 Third thermometer, 12.4 Fourth thermometer, 12.5 Fifth thermometer, 13 Main motor, 14.1 First coupling, 14.2 Second coupling, 15.1 First torque meter, 15.2 Second torque meter, 16.1 First tachometer, 16.2 Second tachometer, 17 Test high-pressure motor, 18 Phase meter, 19 Magnetic powder loader, 20 High-pressure relief valve, 21.1 First low-pressure flow meter, 21.2 Second low-pressure flow meter, 21.3 Third low-pressure flow meter, 21.4 Fourth low-pressure flow meter, 22 Circulating oil pump, 23 Coupling, 24 Rotary worktable, 25 Back pressure regulating valve. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 invention and simplifying the description, 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 invention.

[0022] In the description of this invention, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In one embodiment, such as Figure 1 As shown, an energy-saving testing system for high-pressure hydraulic motors includes an oil tank unit, an oil replenishment unit, an oil tank temperature regulation unit, a test circuit and a motor power recovery unit, and a performance testing unit.

[0024] The fuel tank unit includes: fuel tank 1 and a fifth temperature sensor 12.5. The fifth temperature sensor 12.5 is mounted on fuel tank 1.

[0025] The oil replenishment unit includes: a variable displacement oil pump 2, a first motor 3.1, a first check valve 4.1, a first filter 5.1, a low-pressure relief valve 6, and a fourth low-pressure flow meter 21.4. The inlet of the variable displacement oil pump 2 is connected to the oil tank 1, and the outlet is connected to the inlet of the first check valve 4.1. The drive shaft of the variable displacement oil pump 2 is connected to the output shaft of the first motor 3.1. The outlet of the first check valve 4.1 is connected to the inlet of the first filter 5.1. The outlet of the first filter 5.1 is connected to the inlet of the first heat exchanger 7.1. The outlet of the first filter 5.1 is also connected in sequence to the low-pressure relief valve 6, the fourth low-pressure flow meter 21.4, and the oil tank 1.

[0026] The oil tank temperature regulation unit includes: a circulating oil pump 22, a second motor 3.2, a second one-way valve 4.2, a sixth filter 5.6, a second heat exchanger 7.2, and a second air-source heat pump 8.2. The inlet of the circulating oil pump 22 is connected to the oil tank 1, and its outlet is connected to the inlet of the second one-way valve 4.2. The drive shaft of the circulating oil pump 22 is connected to the output shaft of the second motor 3.2. The outlet of the second one-way valve 4.2 is connected to the inlet of the sixth filter 5.6. The outlet of the sixth filter 5.6 is connected to the heat exchange inlet of the second heat exchanger 7.2. The heat exchange outlet of the second heat exchanger 7.2 is connected to the oil tank 1. The second heat exchanger 7.2 is also connected to the second air-source heat pump 8.2.

[0027] The test circuit and motor power recovery unit include: a third one-way valve 4.3, a second filter 5.2, a third filter 5.3, a fourth filter 5.4, a fifth filter 5.5, a first heat exchanger 7.1, a first air-source heat pump 8.1, a high-pressure variable oil pump 9, a high-pressure flow meter 10, a first pressure gauge 11.1, a second pressure gauge 11.2, a third pressure gauge 11.3, a first thermometer 12.1, a second thermometer 12.2, a third thermometer 12.3, a fourth thermometer 12.4, a main motor 13, a first coupling 14.1, a second coupling 14.2, a first torque meter 15.1, a first tachometer 16.1, a tested high-pressure motor 17, a high-pressure relief valve 20, a first low-pressure flow meter 21.1, a second low-pressure flow meter 21.2, a third low-pressure flow meter 21.3, a coupling 23, a rotary table 24, and a back pressure regulating valve 25. The heat exchange inlet of the first air-source heat pump 8.1 is connected to the outlet of the first filter 5.1. The heat exchange outlet of the first air-source heat pump 8.1 is connected to the inlet of the high-pressure variable oil pump 9. The outlet of the high-pressure variable oil pump 9 is connected to the inlet of the third check valve 4.3. The outlet of the third check valve 4.3 is connected to the inlet of the high-pressure flow meter 10. The outlet of the high-pressure flow meter 10 is connected to the inlet of the tested high-pressure motor 17. The outlet of the tested high-pressure motor 17 is sequentially connected to the inlet of the back pressure regulating valve 25 and the fifth filter 5.5. The outlet of the fifth filter 5.5 is connected to the inlet of the first heat exchanger 7.1. The outlet of the high-pressure variable oil pump 9 is also sequentially connected to the inlets of the high-pressure relief valve 20, the third filter 5.3, the third low-pressure flow meter 21.3, and the oil tank 1. The drain port of the high-pressure variable oil pump 9 is also connected in sequence to the oil port of the second filter 5.2, the second low-pressure flow meter 21.2, and the oil tank 1. The drive shaft of the high-pressure variable oil pump 9 is connected in sequence to the first torque meter 15.1, the first tachometer 16.1, the main motor 13, and the first coupling 14.1. The oil inlet of the tested high-pressure motor 17 is equipped with a first pressure gauge 11.1 and a first thermometer 12.1. The oil outlet of the tested high-pressure motor 17 is equipped with a second pressure gauge 11.2 and a second thermometer 12.2. The drain port of the tested high-pressure motor 17 is connected in sequence to the fourth filter 5.4, the first low-pressure flow meter 21.1, and the oil tank 1. The drain port of the tested high-pressure motor 17 is also equipped with a third pressure gauge 11.3 and a third thermometer 12.3. The oil inlet of the first heat exchanger 7.1 is also equipped with a fourth thermometer 12.4. The output shaft of the high-voltage motor 17 under test is fitted with a coupling 23. The high-voltage motor 17 under test is mounted on a rotary table 24.

[0028] The performance testing unit includes a second coupling 14.2, a second torque meter 15.2, a second tachometer 16.2, a phase meter 18, and a magnetic powder loader 19. The second coupling 14.2 is connected in sequence to the second torque meter 15.2, the second tachometer 16.2, the phase meter 18, and the magnetic powder loader 19.

[0029] The testing system employs a closed-loop design, minimizing unnecessary components on the high-voltage side of the motor and utilizing mature, high-voltage resistant components. Durability testing involves stable motor speed and load conditions over a long period, facilitating power recovery. Other performance tests require variable motor speed and load conditions with shorter test times, and the corresponding motor loaders also have variable load requirements, hindering power recovery. Therefore, durability testing needs to be differentiated from other performance testing functions. The test mode of the motor is switched via a rotary table. When testing motor durability, the rotary table is adjusted to connect the output shaft of the high-voltage motor to the main motor, recovering the output shaft power. When testing other motor performance, the rotary table is adjusted to connect the output shaft of the high-voltage motor to the magnetic powder brake, allowing testing of high-voltage motor starting efficiency, low-speed performance, and other test items. A high-pressure variable pump adjusts the system flow rate, enabling testing of high-voltage motors with different displacement specifications. The oil replenishment unit replenishes oil based on the amount discharged from the closed-loop system, reducing unnecessary oil replenishment and achieving energy savings. Utilizing an air-source heat pump to heat or cool the oil is more energy-efficient than traditional temperature control methods.

[0030] The testing system provided by this invention patent has the following eight features and functions, which are described below: (1) Good high pressure resistance and economy: At the high-pressure end of the closed loop, i.e., the oil inlet of the tested high-pressure motor 17, mature high-pressure resistant components, namely the high-pressure flow meter 10, high-pressure relief valve 20, third check valve 4.3, first pressure gauge 11.1, and first temperature gauge 12.1, are used. The fifth filter 5.5 and the first heat exchanger 7.1, which have lower pressure resistance, are placed at the low-pressure end of the closed loop, i.e., the oil return end of the tested high-pressure motor 17, thus ensuring the high-pressure resistance of the test system. Infrequently used high-pressure components require custom manufacturing, which is costly; using mature high-pressure resistant components reduces the manufacturing cost of the test system.

[0031] (2) Test mode switching function: Adjusting the rotary table 24 allows switching the test mode of the high-voltage motor 17 under test. When testing the motor's durability, the rotary table 24 is adjusted to connect the first coupling 14.1 and the coupling 23, connecting the output shaft of the high-voltage motor 17 under test to the main motor 13. When testing other motor performance characteristics, the rotary table 24 is adjusted to connect the second coupling 14.2 and the coupling 23, connecting the output shaft of the high-voltage motor 17 under test to the magnetic powder loader 19.

[0032] (3) Endurance test power recovery function: When testing the durability performance of the high-voltage motor 17 under test, the output power of the high-voltage motor 17 is transmitted back to the high-pressure variable oil pump 9 through the main motor 13, where the main motor 13 plays a power compensation role in the durability test. During this durability test, most of the power output of the high-voltage motor 17 under test is recovered and utilized by the high-pressure variable oil pump 9, and the main motor 13 compensates for a portion of the lost power to maintain the stable operation of the durability test.

[0033] During durability testing, the required flow rate varies depending on the displacement of the high-pressure motor 17 under test. Adjusting the displacement of the high-pressure variable pump 9 can adjust the flow rate of the system, thus enabling the testing of motors with different displacement specifications.

[0034] (4) Performance testing function: I. Efficiency Testing Function: The main motor 13 is started to drive the high-pressure variable oil pump 9 to output oil, which then drives the tested high-pressure motor 17 to rotate. The magnetic powder loader 19 applies a reverse braking torque to the rotation of the tested high-pressure motor 17. By changing the output speed of the main motor 13 and the braking torque of the magnetic powder loader 19, the output speed and inlet pressure of the tested high-pressure motor 17 can be adjusted, thereby obtaining the efficiency of the tested high-pressure motor 17 at different speeds and pressures.

[0035] II. Variable characteristic test function: Control the displacement of the high-voltage motor 17 under test and test the correspondence between different control variables and controlled variables, that is, the variable characteristics of the motor.

[0036] III. Starting efficiency test function: The test high-voltage motor 17 is locked by the magnetic powder brake 20, and the output torque of the test high-voltage motor 17 is tested under rated pressure, zero speed, different return oil pressure and different phase angle.

[0037] IV. Low-speed performance test function: The magnetic powder brake 20 is used to load the high-pressure motor 17 under test to reach the rated pressure, and then the output oil volume of the variable oil pump 9 is adjusted to test the minimum stable speed of the high-pressure motor 17 under test.

[0038] V. Overspeed test function: Adjust the output oil volume of variable oil pump 9 to make the speed of the tested high-pressure motor 17 reach 110% of the rated value, and then use magnetic powder brake 20 to apply load to make the tested high-pressure motor 17 reach the rated pressure, and test the overspeed stability of the tested high-pressure motor 17.

[0039] VI. Overload test function: Adjust the output oil volume of variable oil pump 9 to make the speed of the tested high-pressure motor 17 reach the rated value, and then use magnetic powder brake 20 to apply load to make the tested high-pressure motor 17 reach 125% of the rated pressure to test the overload stability of the tested high-pressure motor 17.

[0040] During performance testing, the required flow rate varies depending on the displacement of the high-pressure motor 17 under test. Adjusting the displacement of the high-pressure variable pump 9 can adjust the flow rate of the system, thus enabling the testing of motors with different displacement specifications.

[0041] (5) Energy-saving variable fuel replenishment function: During test operation, a portion of hydraulic oil leaks back to the oil tank 1 from the tested high-pressure motor 17, high-pressure variable oil pump 9, and high-pressure relief valve 20. The amount of leaked oil varies with the operating conditions. To ensure normal operation of the test, the closed loop needs to be replenished with oil. The variable oil replenishment pump 2 replenishes oil according to the amount of oil discharged in the closed loop, namely the flow rates of the first low-pressure flow meter 21.1, the second low-pressure flow meter 21.2, the third low-pressure flow meter 21.3, and the fourth low-pressure flow meter 21.4. Compared with the traditional fixed-displacement pump replenishment method, this reduces unnecessary oil replenishment, thereby achieving energy-saving effects.

[0042] (6) Energy-saving oil temperature control function: When the oil temperature in tank 1 exceeds the test temperature range, the circulating oil pump 22 and the second air-source heat pump 8.2 are started and their cooling function is activated to cool the high-temperature oil. When the oil temperature in tank 1 is below the test temperature range, the circulating oil pump 22 and the second air-source heat pump 8.2 are started and their heating function is activated to heat the low-temperature oil. When the oil temperature in the closed circuit exceeds the test temperature range, the first air-source heat pump 8.1 is started and its cooling function is activated to cool the high-temperature oil. When the oil temperature in the closed circuit is below the test temperature range, the first air-source heat pump 8.1 is started and its heating function is activated to heat the low-temperature oil. The air-source heat pump utilizes the energy in the air to heat or cool the hydraulic oil, which consumes less energy compared to traditional temperature control methods.

[0043] (7) Test data acquisition function: Temperature sensors, pressure gauges, flow meters, torque meters, tachometers, and phase meters in the system collect and process data through a data acquisition unit, and the processed data is then transmitted to the display.

[0044] (8) Other auxiliary functions: The system includes auxiliary components such as check valves, relief valves, back pressure regulating valves, filters, and oil tanks to ensure normal operation of the test. Check valves allow hydraulic oil to flow in only one direction, preventing backflow and damage to the hydraulic pump. Relief valves prevent excessive system pressure, protecting hydraulic components. Back pressure regulating valves adjust the motor's return oil pressure. Filters filter the hydraulic oil, preventing contaminants from damaging hydraulic components. Oil tanks store hydraulic oil.

[0045] In summary, this invention provides a high-voltage motor testing system that offers good high-voltage resistance and economy, high efficiency and energy saving, simple and compact structure, complete functions, and is suitable for performance testing of high-voltage motors with different displacement specifications.

[0046] It should be understood that the terms "first," "second," etc., are used in this invention to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, 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, and therefore should not be construed as a limitation of this invention.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An energy-saving testing system for high-pressure hydraulic motors, characterized in that: It includes an oil tank unit, an oil replenishment unit, an oil tank temperature regulation unit, a test circuit, a motor power recovery unit, and a performance testing unit.

2. The testing system according to claim 1, characterized in that: The oil tank unit includes: an oil tank (1) and a fifth temperature sensor (12.5). The fifth temperature sensor (12.5) is installed on the oil tank (1).

3. The testing system according to claim 1, characterized in that: The oil replenishment unit includes a variable oil replenishment pump (2), a first motor (3.1), a first check valve (4.1), a first filter (5.1), a low-pressure relief valve (6), and a fourth low-pressure flow meter (21.4). The inlet of the variable oil pump (2) is connected to the oil tank (1), and the outlet is connected to the inlet of the first check valve (4.1). The drive shaft of the variable oil replenishment pump (2) is connected to the output shaft of the first motor (3.1); The oil outlet of the first check valve (4.1) is connected to the oil inlet of the first filter (5.1); The oil outlet of the first filter (5.1) is connected to the oil inlet of the first heat exchanger (7.1). The oil outlet of the first filter (5.1) is also connected in sequence to the low-pressure relief valve (6), the fourth low-pressure flow meter (21.4) and the oil tank (1).

4. The testing system according to claim 1, characterized in that: The oil tank oil temperature regulation unit includes a circulating oil pump (22), a second motor (3.2), a second one-way valve (4.2), a sixth filter (5.6), a second heat exchanger (7.2), and a second air source heat pump (8.2). The oil inlet of the circulating oil pump (22) is connected to the oil tank (1), and the oil outlet is connected to the oil inlet of the second check valve (4.2). The drive shaft of the circulating oil pump (22) is connected to the output shaft of the second motor (3.2). The oil outlet of the second check valve (4.2) is connected to the oil inlet of the sixth filter (5.6); The oil outlet of the sixth filter (5.6) is connected to the heat exchange oil inlet of the second heat exchanger (7.2); The heat exchange outlet of the second heat exchanger (7.2) is connected to the oil tank (1), and the second heat exchanger (7.2) is also connected to the second air source heat pump (8.2).

5. The testing system according to claim 1, characterized in that: The test circuit and motor power recovery unit include a third one-way valve (4.3), a second filter (5.2), a third filter (5.3), a fourth filter (5.4), a fifth filter (5.5), a first heat exchanger (7.1), a first air-source heat pump (8.1), a high-pressure variable oil pump (9), a high-pressure flow meter (10), a first pressure gauge (11.1), a second pressure gauge (11.2), a third pressure gauge (11.3), a first thermometer (12.1), and a second thermometer (12.2). 2) Third thermometer (12.3), fourth thermometer (12.4), main motor (13), first coupling (14.1), second coupling (14.2), first torque meter (15.1), first tachometer (16.1), tested high-pressure motor (17), high-pressure relief valve (20), first low-pressure flow meter (21.1), second low-pressure flow meter (21.2), third low-pressure flow meter (21.3), coupling (23), rotary table (24), back pressure regulating valve (25); The heat exchange oil inlet of the first air source heat pump (8.1) is connected to the oil outlet of the first filter (5.1), and the heat exchange oil outlet of the first air source heat pump (8.1) is connected to the oil inlet of the high-pressure variable oil pump (9). The outlet of the high-pressure variable oil pump (9) is connected to the inlet of the third check valve (4.3); The oil outlet of the third check valve (4.3) is connected to the oil inlet of the high pressure flow meter (10), the oil outlet of the high pressure flow meter (10) is connected to the oil inlet of the high pressure motor under test (17), the oil outlet of the high pressure motor under test (17) is connected in sequence to the oil inlet of the back pressure regulating valve (25) and the fifth filter (5.5), and the oil outlet of the fifth filter (5.5) is connected to the oil inlet of the first heat exchanger (7.1). The outlet of the high-pressure variable oil pump (9) is connected in sequence to the oil port of the high-pressure overflow valve (20), the third filter (5.3), the third low-pressure flow meter (21.3), and the oil tank (1). The drain port of the high-pressure variable oil pump (9) is connected in sequence to the oil port of the second filter (5.2), the second low-pressure flow meter (21.2), and the oil tank (1). The drive shaft of the high-pressure variable oil pump (9) is connected in sequence to the first torque meter (15.1), the first tachometer (16.1), the main motor (13), and the first coupling (14.1). The oil inlet of the tested high-pressure motor (17) is equipped with a first pressure gauge (11.1) and a first thermometer (12.1), and the oil outlet of the tested high-pressure motor (17) is equipped with a second pressure gauge (11.2) and a second thermometer (12.2). The oil outlet of the tested high-pressure motor (17) is connected in sequence to a fourth filter (5.4), a first low-pressure flow meter (21.1) and an oil tank (1). The oil outlet of the tested high-pressure motor (17) is also equipped with a third pressure gauge (11.3) and a third thermometer (12.3). The first heat exchanger (7.1) is also equipped with a fourth thermometer (12.4) at its oil inlet. The output shaft of the high-pressure motor under test (17) is equipped with a coupling (23). The high-pressure motor under test (17) is mounted on a rotary table (24).

6. The testing system according to claim 1, characterized in that: The performance testing unit includes a second coupling (14.2), a second torque meter (15.2), a second tachometer (16.2), a phase meter (18), and a magnetic powder loader (19). The second coupling (14.2) is connected in sequence to the second torque meter (15.2), the second tachometer (16.2), the phase meter (18), and the magnetic powder loader (19).

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