A hydraulic device for high-speed motor vacuum test

Abstract

The utility model relates to a kind of hydraulic device for high-speed motor vacuum test, including oil tank, still including rack, low-pressure lubricating oil path module is fixedly installed in the right end of the inner bottom of rack, support and pressure-maintaining oil path module, fixedly installed in the left rear end of the inner bottom of rack, cooling lubrication filtration system is fixedly installed in the left end of the inner bottom of rack, the motor test module is fixedly installed in the left front end of the inner bottom of rack, realize accurate pressure control to oil path flow by low-pressure lubricating oil path module, ensure that stable effective lubrication flow can be provided under different test conditions of high-speed motor, support and pressure-maintaining oil path module then real-time monitoring oil path pressure by pressure detection element, when detecting pressure anomaly, protection mechanism can be triggered in time, prevent lubrication interruption problem caused by oil pipe suction empty, cooling lubrication filtration system can efficiently cool and filter oil in oil path, reduce oil temperature, comprehensively improve the reliability and accuracy of high-speed motor vacuum test.

Description

Technical Field

[0001] This utility model relates to the field of motor performance testing technology, and in particular to a hydraulic device for vacuum testing of high-speed motors. Background Technology

[0002] High-speed motors, due to their high rotational speed and large rotor linear velocity, are prone to significant aerodynamic losses and temperature rise during actual operation. Therefore, in the research and development and type testing phases, it is often necessary to conduct performance tests and reliability verifications of high-speed motors in a vacuum or near-vacuum environment.

[0003] The aforementioned existing technical solutions have the following drawbacks: the sealing structure of conventional hydraulic devices is prone to gas infiltration in a vacuum environment, making it difficult to maintain the vacuum level of the vacuum chamber and resulting in poor compatibility between the heat dissipation and lubrication systems. During high-speed motor vacuum testing, the actuators of the hydraulic device will generate a large amount of heat. However, in a vacuum environment, the heat transfer method is only thermal radiation without convection, which leads to an increase in hydraulic oil temperature. When the hydraulic oil temperature rises to a certain level, it will accelerate the aging of the hydraulic oil and reduce the service life of the seals. In a vacuum environment, the volatility of the grease increases, which can easily cause lubrication failure of moving parts, leading to wear or jamming problems and affecting the reliability of the hydraulic device. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic device for vacuum testing of high-speed motors, so as to solve the problems existing in the prior art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A hydraulic device for vacuum testing of a high-speed motor includes an oil tank, a frame fixedly mounted on top of the oil tank, a low-pressure lubrication circuit module fixedly mounted on the right end of the bottom of the frame for pressure regulation to ensure effective flow in the oil circuit, a support and pressure holding oil circuit module fixedly mounted on the left rear end of the bottom of the frame for pressure detection to prevent the oil pipe from being sucked into the air, a cooling lubrication filtration system fixedly mounted on the left end of the bottom of the frame for cooling and lubricating the oil in the oil circuit, and a motor testing module fixedly mounted on the left front end of the bottom of the frame for vacuum testing of the high-speed motor.

[0006] By adopting the above technical solutions, the risk of gas infiltration in a vacuum environment is reduced. The low-pressure lubrication circuit module enables precise pressure regulation and control of the oil flow, ensuring a stable and effective lubrication flow under different test conditions of the high-speed motor. The support and pressure-holding oil circuit module uses pressure detection elements to monitor the oil pressure in real time. When an abnormal pressure is detected, a protection mechanism can be triggered in time to prevent lubrication interruption caused by oil pipe cavitation. The cooling lubrication filtration system can efficiently cool and filter the oil in the oil circuit, reduce the oil temperature, slow down the aging rate of hydraulic oil, and ensure the service life of the seals. The motor test module uses structures such as mounting bases and shock-absorbing rings to achieve stable installation and shock absorption of the high-speed motor, ensuring the smooth operation of the motor during vacuum testing, thereby comprehensively improving the reliability and accuracy of high-speed motor vacuum testing.

[0007] In a further embodiment, the feature is that: a partition is fixedly installed inside the oil tank, the partition divides the oil tank into a first chamber and a second chamber, and oil filling holes are symmetrically arranged on the left and right sides of the front end of the oil tank.

[0008] By adopting the above technical solution, the partition divides the oil tank into an independent first chamber and a second chamber, effectively avoiding the mixing and contamination of oils in different states and improving oil utilization efficiency.

[0009] In a further embodiment, the low-pressure lubrication circuit module includes a servo motor, a first gear pump, a first proportional pressure reducing valve, a low-pressure accumulator, a first electromagnetic ball valve, and an oil-gas separator. A servo motor is symmetrically fixedly installed at the right end of the bottom of the frame. The axis of the servo motor is vertically oriented, and the output shaft of the servo motor extends downward through the frame. A first gear pump is fixedly installed at the bottom of the output shaft of the servo motor. A first electromagnetic ball valve is fixedly installed at the rear side of the servo motor. A first proportional pressure reducing valve is fixedly installed at the front end of the top of the frame. A low-pressure accumulator is symmetrically fixedly installed at the rear end of the top of the frame. The axis of the low-pressure accumulator is vertically oriented, and an oil-gas separator is located at the bottom of the low-pressure accumulator. The oil-gas separator is fixedly installed at the inner top of the frame, and the bottom of the oil-gas separator extends downward into a second chamber. The exhaust port of the oil-gas separator extends rearward to the rear end face of the frame.

[0010] By adopting the above technical solution, the servo motor drives the first gear pump to work, and the first proportional pressure reducing valve realizes the precise adjustment of the oil circuit pressure, ensuring that the output flow is stable and adaptable to the lubrication requirements of the high-speed motor. The low-pressure accumulator can absorb the pressure pulsation in the oil circuit and maintain the system pressure stability, while the oil-gas separator can effectively separate the gas in the oil, thereby achieving vacuum conditions.

[0011] In a further embodiment, a first oil pipe is fixedly installed at the bottom of the first proportional pressure reducing valve, and the other end of the first oil pipe extends downward to be fixedly connected to the front end face of the first gear pump. An oil suction pipe is fixedly installed at the rear side of the first gear pump. A second oil pipe is fixedly installed on the outer side of the first electromagnetic ball valve, and the second oil pipe communicates with the first oil pipe. A third oil pipe is fixedly installed on the left and right sides of the top of the first proportional pressure reducing valve, and the third oil pipe extends backward to be fixedly connected to a three-way valve. A fourth oil pipe is fixedly installed at the bottom of the three-way valve, and the fourth oil pipe extends downward to communicate with the second chamber. A three-way valve is fixedly installed at the bottom of the low-pressure accumulator. A fifth oil pipe is fixedly installed on the left and right sides of the bottom of the first proportional pressure reducing valve, and the fifth oil pipe extends backward to communicate with the three-way valve at the bottom of the low-pressure accumulator. A sixth oil pipe is fixedly installed on the front side of the three-way valve of the low-pressure accumulator, and the other end of the sixth oil pipe is fixedly installed to the rear end face of the frame.

[0012] By adopting the above technical solution, the first oil pipe delivers the oil output from the first gear pump to the first proportional pressure reducing valve. After pressure adjustment, the oil is diverted to the three-way valve through the third oil pipe, and part of the oil flows back to the second chamber through the fourth oil pipe, realizing oil circuit circulation. At the same time, the fifth oil pipe introduces the pressure-adjusted oil into the low-pressure accumulator, which plays a role in stabilizing pressure and storing energy. The oil in the low-pressure accumulator is delivered to the actuator at the rear end of the frame through the sixth oil pipe, providing a stable lubrication supply for high-speed motor testing. The first electromagnetic ball valve is connected to the first oil pipe through the second oil pipe, which can control the oil circuit opening and closing according to the test requirements, improving the flexibility and safety of system operation.

[0013] In a further embodiment, the cooling, lubrication, and filtration system includes a first motor, a first gear pump, and a vane pump. The vane pump is fixedly installed at the top left end of the frame, and the first motor is fixedly installed at the bottom left rear end of the frame. The axis of the first motor is vertically arranged. The first gear pump is fixedly installed at the bottom of the first motor. An oil suction pipe is fixedly installed at the front side of the first gear pump, and a seventh oil pipe is fixedly installed at the rear side of the first gear pump. The seventh oil pipe extends upward and communicates with the rear end of the vane pump. An eighth oil pipe is provided at the front end of the vane pump, and the other end of the eighth oil pipe extends rearward to the bottom of the frame and communicates with the first chamber.

[0014] By adopting the above technical solution, the first motor drives the first gear pump to operate, drawing oil from the oil storage area through the suction pipe, and then transporting it to the vane pump through the seventh oil pipe. After the vane pump pressurizes the oil, it is transported to the first chamber through the eighth oil pipe, realizing the circulation of the oil. During this process, the flowing oil can carry away the heat generated by the operation of the hydraulic device, and at the same time, the pressurization effect of the vane pump can improve the lubrication performance of the oil, ensuring effective lubrication and heat dissipation of each component during high-speed motor testing.

[0015] In a further embodiment, the support and pressure-holding oil circuit module includes a second proportional pressure reducing valve, a solenoid directional valve, and a second solenoid ball valve. The second proportional pressure reducing valve is fixedly installed at the top of the rear end face inside the frame, and the second solenoid ball valve is fixedly installed on the front end face of the second proportional pressure reducing valve. Solenoid directional valves are fixedly installed at both the top and bottom of the second solenoid ball valve.

[0016] By adopting the above technical solution, the second proportional pressure reducing valve can dynamically adjust the output pressure according to the system pressure demand, and work with the solenoid directional valve to achieve precise switching of the oil circuit direction. When the oil circuit pressure is lower than the set threshold, the second solenoid ball valve opens quickly to replenish the oil, preventing the actuator from jamming due to a sudden drop in pressure, thereby ensuring the continuous pressure holding capability and operational stability of the hydraulic device during the vacuum test process.

[0017] In a further embodiment, the motor testing module includes a mounting base, a shock-absorbing ring, and a second gear pump. The mounting base is fixedly installed at the left front end of the bottom of the frame, with the bottom of the mounting base extending downward to the bottom of the frame. A shock-absorbing ring is fitted onto the top of the mounting base, and a second gear pump is fixedly installed at the bottom of the mounting base. The output axis of the second gear pump extends upward into the mounting base, and the axis of the second gear pump is vertically arranged. An oil suction pipe is fixedly installed at the front end of the second gear pump.

[0018] By adopting the above technical solution, the mounting base provides a stable mounting foundation for the high-speed motor. Its bottom extending to the bottom of the frame enhances the load-bearing capacity of the overall structure. The shock-absorbing ring at the top can effectively absorb the vibration generated during motor operation, avoiding resonance from affecting the test accuracy and device stability. The second gear pump draws oil from the oil storage area through the oil suction pipe at the front end, and its output shaft extends upward into the mounting base, which can provide lubrication medium for relevant moving parts during motor testing, ensuring stable operation of the high-speed motor in a vacuum environment, thereby achieving accurate testing of motor performance.

[0019] In a further embodiment, a ninth oil pipe is fixedly installed at the top left side of the second proportional pressure reducing valve, and the other end of the ninth oil pipe is fixedly installed at the front side of the motor test module. The ninth oil pipe is connected to the first chamber. A tenth oil pipe is fixedly installed at the bottom left side of the second proportional pressure reducing valve, and the other end of the tenth oil pipe is fixedly connected to the right end of the second gear pump.

[0020] By adopting the above technical solution, the ninth oil pipe delivers the pressure oil regulated by the second proportional pressure reducing valve to the front of the motor test module and forms a loop with the first chamber to realize the recycling of oil. The tenth oil pipe is directly connected to the second proportional pressure reducing valve and the second gear pump to provide stable drive oil pressure for the second gear pump, ensuring that it continuously outputs oil flow that meets lubrication requirements during high-speed motor testing, and further improving the operational reliability of the motor test module.

[0021] In summary, this utility model has the following beneficial effects: 1. By setting up a low-pressure lubrication circuit module, precise pressure regulation and control of the oil flow can be achieved, ensuring a stable and effective lubrication flow under different test conditions of the high-speed motor; 2. By setting up support and pressure-holding oil circuit modules, the oil circuit pressure can be monitored in real time with the help of pressure detection elements. When an abnormal pressure is detected, the protection mechanism can be triggered in time to prevent lubrication interruption caused by oil pipe suction. 3. The cooling, lubrication and filtration system can efficiently cool and filter the oil in the oil circuit, reduce the oil temperature, slow down the aging of hydraulic oil, and ensure the service life of the seals. Attached Figure Description

[0022] Figure 1 This is an overall schematic diagram of the present invention, used to illustrate the connection relationship between the oil tank and the frame; Figure 2 This is a schematic diagram illustrating the oil tank, low-pressure lubrication circuit module support, pressure-holding oil circuit module, and cooling lubrication filtration system in this utility model. Figure 3 This is a schematic diagram illustrating the structural connection between the servo motor and the first gear pump in this utility model; Figure 4 This is a structural schematic diagram illustrating the motor testing module in this utility model.

[0023] In the diagram: 1. Oil tank; 2. Frame; 3. Low-pressure lubrication circuit module; 31. Servo motor; 32. First gear pump; 33. First proportional pressure reducing valve; 34. Low-pressure accumulator; 35. First solenoid ball valve; 36. Oil-gas separator; 4. Support and pressure-holding oil circuit module; 41. Second proportional pressure reducing valve; 42. Solenoid directional valve; 43. Second solenoid ball valve; 5. Cooling, lubrication and filtration system; 51. First motor; 52. Vane pump; 6. Motor testing module; 61. Mounting base; 62. Shock absorber ring; 63. Second gear pump; 7. Partition plate; 8. First chamber; 9. Second chamber; 10. Oil injection hole. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0026] Example 1: like Figure 1 - Figure 4 As shown, a hydraulic device for vacuum testing of a high-speed motor includes an oil tank 1, a frame 2 fixedly mounted on top of the oil tank 1; a low-pressure lubrication oil circuit module 3 fixedly mounted on the right end of the bottom of the frame 2, used for pressure regulation and control to ensure effective flow of the oil circuit; a support and pressure holding oil circuit module 4 fixedly mounted on the left rear end of the bottom of the frame 2, used for pressure detection to prevent the oil pipe from being sucked into the air; a cooling lubrication filtration system 5 fixedly mounted on the left end of the bottom of the frame 2, used for cooling and lubricating the oil in the oil circuit; and a motor testing module 6 fixedly mounted on the left front end of the bottom of the frame 2, used for vacuum testing of the high-speed motor 51.

[0027] A partition 7 is fixedly installed inside the oil tank 1, which divides the oil tank 1 into a first chamber 8 and a second chamber 9. Oil filling holes 10 are symmetrically arranged on the left and right sides of the front end of the oil tank 1.

[0028] The low-pressure lubrication circuit module 3 includes a servo motor 31, a first gear pump 32, a first proportional pressure reducing valve 33, a low-pressure accumulator 34, a first electromagnetic ball valve 35, and an oil-gas separator 36. The servo motor 31 is symmetrically fixedly installed on the right end of the bottom of the frame 2. The axis of the servo motor 31 is vertically set. The output shaft of the servo motor 31 extends downward through the frame 2. The first gear pump 32 is fixedly installed at the bottom of the output shaft of the servo motor 31. The first electromagnetic ball valve 35 is fixedly installed on the rear side of the servo motor 31. The first proportional pressure reducing valve 33 is fixedly installed at the front end of the top of the frame 2. The low-pressure accumulator 34 is symmetrically fixedly installed on the rear end of the top of the frame 2. The axis of the low-pressure accumulator 34 is vertically set. The oil-gas separator 36 is set at the bottom of the low-pressure accumulator 34. The oil-gas separator 36 is fixedly installed in the inner top of the frame 2. The bottom of the oil-gas separator 36 extends downward into the second chamber 9. The exhaust port of the oil-gas separator 36 extends rearward to the rear end face of the frame 2.

[0029] A first oil pipe is fixedly installed at the bottom of the first proportional pressure reducing valve 33. The other end of the first oil pipe extends downward and is fixedly connected to the front end face of the first gear pump 32. An oil suction pipe is fixedly installed at the rear side of the first gear pump 32. A second oil pipe is fixedly installed on the outside of the first solenoid ball valve 35. The second oil pipe is connected to the first oil pipe. A third oil pipe is fixedly installed on the left and right sides of the top of the first proportional pressure reducing valve 33. The third oil pipe extends backward and is fixedly connected to the three-way valve. A fourth oil pipe is fixedly installed at the bottom of the three-way valve. The fourth oil pipe extends downward and is connected to the second chamber 9. A three-way valve is fixedly installed at the bottom of the low-pressure accumulator 34. A fifth oil pipe is fixedly installed on the left and right sides of the bottom of the first proportional pressure reducing valve 33. The fifth oil pipe extends backward and is connected to the three-way valve at the bottom of the low-pressure accumulator 34. A sixth oil pipe is fixedly installed on the front side of the three-way valve of the low-pressure accumulator 34. The other end of the sixth oil pipe is fixedly installed to the rear end face of the frame 2.

[0030] The cooling, lubrication and filtration system 5 includes a first motor 51, a first gear pump 32 and a vane pump 52. The vane pump 52 is fixedly installed at the top left end inside the frame 2. The first motor 51 is fixedly installed at the bottom left rear end inside the frame 2. The axis of the first motor 51 is vertically set. The first gear pump 32 is fixedly installed at the bottom of the first motor 51. An oil suction pipe is fixedly installed at the front side of the first gear pump 32. A seventh oil pipe is fixedly installed at the rear side of the first gear pump 32. The seventh oil pipe extends upward and communicates with the rear end of the vane pump 52. An eighth oil pipe is provided at the front end of the vane pump 52. The other end of the eighth oil pipe extends backward to the bottom of the frame 2 and communicates with the first chamber 8.

[0031] The support and pressure-holding oil circuit module 4 includes a second proportional pressure reducing valve 41, an electromagnetic directional valve 42, and a second electromagnetic ball valve 43. The second proportional pressure reducing valve 41 is fixedly installed at the top of the rear end face of the inner frame 2. The second electromagnetic ball valve 43 is fixedly installed on the front end face of the second proportional pressure reducing valve 41. The electromagnetic directional valve 42 is fixedly installed on both the top and bottom of the second electromagnetic ball valve 43.

[0032] The motor testing module 6 includes a mounting base 61, a shock-absorbing ring 62, and a second gear pump 63. The mounting base 61 is fixedly installed at the left front end of the bottom of the frame 2. The bottom of the mounting base 61 extends downward to the bottom of the frame 2. The top of the mounting base 61 is fitted with a shock-absorbing ring 62. The bottom of the mounting base 61 is fixedly installed with the second gear pump 63. The output axis of the second gear pump 63 extends upward into the mounting base 61. The axis of the second gear pump 63 is vertically set. The front end of the second gear pump 63 is fixedly installed with an oil suction pipe.

[0033] The ninth oil pipe is fixedly installed on the top left side of the second proportional pressure reducing valve 41. The other end of the ninth oil pipe is fixedly installed on the front side of the motor test module 6. The ninth oil pipe is connected to the first chamber 8. The tenth oil pipe is fixedly installed on the bottom left side of the second proportional pressure reducing valve 41. The other end of the tenth oil pipe is fixedly connected to the right end of the second gear pump 63.

[0034] Specific implementation process: The motor to be tested is fixedly mounted on the mounting base 61. The servo motor 31 drives the first gear pump 32 to work, and in conjunction with the first proportional pressure reducing valve 33, the oil circuit pressure is precisely adjusted to ensure that the output flow is stable and matches the lubrication requirements of the high-speed motor. The low-pressure accumulator 34 can absorb pressure pulsations in the oil circuit and maintain stable system pressure, while the oil-gas separator 36 can effectively separate gas from the oil to achieve vacuum conditions. The second proportional pressure reducing valve 41 can dynamically adjust the output pressure according to the system pressure requirements, and in conjunction with the solenoid directional valve 42, achieves... Precise switching of the oil circuit direction: When the oil circuit pressure is lower than the set threshold, the second solenoid ball valve 43 quickly opens to replenish the oil, preventing the actuator from jamming due to a sudden drop in pressure. The first motor 51 drives the first gear pump 32 to operate, drawing oil from the oil storage area through the suction pipe, and then transporting it to the vane pump 52 through the seventh oil pipe. After the vane pump 52 pressurizes the oil, it is transported to the first chamber 8 through the eighth oil pipe, realizing the circulation of the oil and thus reducing the oil temperature. The motor under test is then connected, and performance testing is carried out continuously during the test time.

[0035] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0036] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A hydraulic device for vacuum testing of high-speed motors, comprising an oil tank (1), characterized in that, Also includes: A frame (2) is fixedly mounted on top of an oil tank (1); Low-pressure lubrication circuit module (3), the low-pressure lubrication circuit module (3) is fixedly installed at the right end of the bottom of the frame (2), the low-pressure lubrication circuit module (3) is used for pressure regulation control to ensure that the oil circuit has an effective flow rate; Support and pressure holding oil circuit module (4), the support and pressure holding oil circuit module (4) is fixedly installed at the left rear end of the bottom of the frame (2), the support and pressure holding oil circuit module (4) is used for pressure detection to prevent the oil pipe from being sucked into the air; Cooling and lubrication filtration system (5), the cooling and lubrication filtration system (5) is fixedly installed at the bottom left end of the frame (2), the cooling and lubrication filtration system (5) is used to cool and lubricate the oil in the oil circuit; The motor test module (6) is fixedly installed at the left front end of the bottom of the frame (2). The motor (51) test module (6) is used for vacuum testing of the high-speed motor (51).

2. The hydraulic device for vacuum testing of high-speed motors according to claim 1, characterized in that: A partition (7) is fixedly installed inside the oil tank (1), which divides the oil tank (1) into a first chamber (8) and a second chamber (9). Oil filling holes (10) are symmetrically arranged on the left and right sides of the front end of the oil tank (1).

3. The hydraulic device for vacuum testing of high-speed motors according to claim 1, characterized in that: The low-pressure lubrication circuit module (3) includes a servo motor (31), a first gear pump (32), a first proportional pressure reducing valve (33), a low-pressure accumulator (34), a first solenoid ball valve (35), and an oil-gas separator (36). The servo motor (31) is symmetrically fixedly installed on the right end of the bottom of the frame (2). The axis of the servo motor (31) is vertically oriented. The output shaft of the servo motor (31) extends downward through the frame (2). The first gear pump (32) is fixedly installed at the bottom of the output shaft of the servo motor (31). A [missing information - likely a device or component] is fixedly installed on the rear side of the servo motor (31). The first electromagnetic ball valve (35) is fixedly installed at the front end of the top of the frame (2). The low-pressure accumulator (34) is fixedly installed symmetrically on the left and right sides of the rear end of the top of the frame (2). The axis of the low-pressure accumulator (34) is vertically set. The bottom of the low-pressure accumulator (34) is provided with an oil-gas separator (36). The oil-gas separator (36) is fixedly installed at the top of the frame (2). The bottom of the oil-gas separator (36) extends downward into the second chamber (9). The exhaust port of the oil-gas separator (36) extends backward to the rear end face of the frame (2).

4. A hydraulic device for vacuum testing of high-speed motors according to claim 3, characterized in that: A first oil pipe is fixedly installed at the bottom of the first proportional pressure reducing valve (33). The other end of the first oil pipe extends downward to be fixedly connected to the front end face of the first gear pump (32). An oil suction pipe is fixedly installed on the rear side of the first gear pump (32). A second oil pipe is fixedly installed on the outside of the first electromagnetic ball valve (35). The second oil pipe is connected to the first oil pipe. A third oil pipe is fixedly installed on the left and right sides of the top of the first proportional pressure reducing valve (33). The third oil pipe extends backward to be fixedly connected to a three-way valve. A fourth oil pipe is fixedly installed at the bottom of the valve. The fourth oil pipe extends downward to communicate with the second chamber (9). A three-way valve is fixedly installed at the bottom of the low-pressure accumulator (34). A fifth oil pipe is fixedly installed on the left and right sides of the bottom end of the first proportional pressure reducing valve (33). The fifth oil pipe extends backward to communicate with the three-way valve at the bottom of the low-pressure accumulator (34). A sixth oil pipe is fixedly installed on the front side of the three-way valve of the low-pressure accumulator (34). The other end of the sixth oil pipe is fixedly installed on the rear end face of the frame (2).

5. A hydraulic device for vacuum testing of high-speed motors according to claim 1, characterized in that: The cooling, lubrication and filtration system (5) includes a first motor (51), a first gear pump (32) and a vane pump (52). The vane pump (52) is fixedly installed at the top left end of the frame (2). The first motor (51) is fixedly installed at the bottom left rear end of the frame (2). The axis of the first motor (51) is vertically set. The first gear pump (32) is fixedly installed at the bottom of the first motor (51). An oil suction pipe is fixedly installed on the front side of the first gear pump (32). A seventh oil pipe is fixedly installed on the rear side of the first gear pump (32). The seventh oil pipe extends upward and communicates with the rear end of the vane pump (52). An eighth oil pipe is provided at the front end of the vane pump (52). The other end of the eighth oil pipe extends backward to the bottom of the frame (2) and communicates with the first chamber (8).

6. A hydraulic device for vacuum testing of high-speed motors according to claim 1, characterized in that: The support and pressure-holding oil circuit module (4) includes a second proportional pressure reducing valve (41), an electromagnetic reversing valve (42), and a second electromagnetic ball valve (43). The second proportional pressure reducing valve (41) is fixedly installed at the top of the rear end face inside the frame (2). The second electromagnetic ball valve (43) is fixedly installed on the front end face of the second proportional pressure reducing valve (41). The electromagnetic reversing valve (42) is fixedly installed at the top and bottom of the second electromagnetic ball valve (43).

7. A hydraulic device for vacuum testing of high-speed motors according to claim 1, characterized in that: The motor test module (6) includes a mounting base (61), a shock-absorbing ring (62), and a second gear pump (63). The mounting base (61) is fixedly installed at the left front end of the bottom of the frame (2). The bottom of the mounting base (61) extends downward to the bottom of the frame (2). The top of the mounting base (61) is fitted with a shock-absorbing ring (62). The bottom of the mounting base (61) is fixedly installed with a second gear pump (63). The output axis of the second gear pump (63) extends upward into the mounting base (61). The axis of the second gear pump (63) is vertically set. The front end of the second gear pump (63) is fixedly installed with an oil suction pipe.

8. A hydraulic device for vacuum testing of high-speed motors according to claim 6, characterized in that: The second proportional pressure reducing valve (41) has a ninth oil pipe fixedly installed at the top left side. The other end of the ninth oil pipe is fixedly installed at the front side of the motor test module (6). The ninth oil pipe is connected to the first chamber (8). The second proportional pressure reducing valve (41) has a tenth oil pipe fixedly installed at the bottom left side. The other end of the tenth oil pipe is fixedly connected to the right end of the second gear pump (63).

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