Hydraulic pump performance test system

Abstract

The utility model relates to the technical field of hydraulic testing, in particular to a hydraulic pump performance testing system. Comprising a liquid storage tank used for being in fluid connection with an inlet of the hydraulic pump, a first measuring cylinder used for being in fluid connection with an outlet of the hydraulic pump, a piston embedded in the first measuring cylinder in a sliding mode, and a measuring assembly connected with a piston rod of the piston and used for measuring the actual displacement of the hydraulic pump. And the counting piece is arranged between the liquid storage tank and the first measuring cylinder and is used for measuring the theoretical displacement of the hydraulic pump. According to the hydraulic pump performance test system, the performance of the hydraulic pump is tested by accurately testing the efficiency of the hydraulic pump, and the hydraulic pump performance test system is simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic testing, in particular to a hydraulic pump performance testing system. Background Art

[0002] The hydraulic pump is the power element of the hydraulic system. It is driven by an engine or an electric motor, sucking oil from the hydraulic oil tank, forming pressure oil and discharging it to the actuator. The performance of the hydraulic system depends largely on the performance of the hydraulic pump. Commonly used hydraulic pumps are divided into gear pumps, vane pumps and plunger pumps according to their structure.

[0003] Due to its high pressure and large flow rate, plunger pumps are widely used in Electronic Stability Controller (ESC). When the vehicle understeers or oversteers, ESC does not require the driver to build up master cylinder pressure. The system can actively build up hydraulic pressure at a certain wheel to ensure stable driving of the vehicle. Among them, the working efficiency of the plunger pump determines the active pressure-building capability of the ESC product. Therefore, during the research and development and design stage of the plunger pump, it is usually necessary to test the performance of the plunger pump, and according to the requirements of the ESC product, the working efficiency of the plunger pump is tested to design a plunger pump that meets the performance requirements. Utility Model Content

[0004] The utility model aims to solve the problem of testing the performance of a hydraulic pump, especially the working efficiency of the hydraulic pump.

[0005] To solve the above problems, the utility model proposes a hydraulic pump performance testing system, comprising a fluid storage tank connected to the inlet fluid of the hydraulic pump, a first measuring cylinder connected to the outlet fluid of the hydraulic pump, a piston slidably embedded in the first measuring cylinder, a measuring component connected to the piston rod of the piston for measuring the actual displacement of the hydraulic pump, and a counting member arranged between the fluid storage tank and the first measuring cylinder for measuring the theoretical displacement of the hydraulic pump.

[0006] Preferably, the measuring assembly includes a grating ruler for measuring the moving distance of the piston, the grating ruler includes a grating ruler body connected to the piston rod of the piston and a mounting block fixedly installed in the second measuring cylinder, and the grating ruler body is transmission-connected to the mounting block.

[0007] Furthermore, it also includes a second measuring cylinder and a pressure tank which are sealedly connected to the first measuring cylinder and are used to provide load pressure to the side of the piston away from the first measuring cylinder. The pressure tank is fluidically connected to the second measuring cylinder and is used to generate the required load pressure in the second measuring cylinder.

[0008] Furthermore, it also includes a proportional valve, which is fluidically connected between the pressure tank and the second measuring cylinder and is used to adjust the load pressure in the second measuring cylinder.

[0009] Furthermore, it also includes a first on-off valve, which is arranged between the liquid storage tank and the inlet of the hydraulic pump and is used to control the opening and closing of the liquid flow path in the hydraulic pump.

[0010] Preferably, it also includes an electric cylinder for discharging gas in the hydraulic pump, a second on-off valve fluidly connected between the electric cylinder and the inlet of the hydraulic pump, and a third on-off valve fluidly connected between the outlet of the hydraulic pump and the fluid storage tank.

[0011] Preferably, it further comprises a pressure sensor disposed between the third on-off valve and the first measuring cylinder, wherein the pressure sensor is used to sense the liquid pressure in the first measuring cylinder.

[0012] Compared with the prior art, the technical solution of the utility model has the following beneficial effects: the efficiency of the hydraulic pump is accurately tested, thereby testing the performance of the hydraulic pump, and the structure is simple and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is the principle diagram of the plunger pump volumetric efficiency testing system of the utility model.

[0015] In the figure:

[0016] 11-liquid storage tank; 12-first measuring cylinder; 121-piston; 13-first on-off valve; 14-first pipeline;

[0017] 21-second measuring cylinder; 22-pressure tank; 23-proportional valve; 24-second pipeline;

[0018] 31-grating ruler; 311-grating ruler body; 312-mounting block; 41-counting piece;

[0019] 51-electric cylinder; 52-second on-off valve; 53-third on-off valve;

[0020] 61-pressure sensor; 71-hydraulic pump. DETAILED DESCRIPTION

[0021] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The orientation or position relationship indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of description and simplified description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the utility model.

[0023] The terms "first", "second", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0024] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0025] See also Figure 1 The utility model provides a technical solution: a hydraulic pump performance test system, including a working simulation unit, a measuring unit, a load pressure simulation unit and a calibration unit. The working simulation unit is used to simulate the working state of the hydraulic pump 71, the measuring unit is used to measure the actual displacement and theoretical displacement of the hydraulic pump 71, the load pressure simulation unit is used to simulate the load pressure at the outlet of the hydraulic pump 71 required for the test, and the calibration unit is used to discharge the gas in the hydraulic pump 71 before the test to reduce the test error. The test system of the utility model also includes a motor used to drive the hydraulic pump 71 in the prior art, and pipelines connecting the units.

[0026] Furthermore, the working simulation unit includes a liquid reservoir 11, a first measuring cylinder 12, a piston 121, a first on-off valve 13 and a first pipeline 14. The liquid reservoir 11 is connected to the inlet fluid of the hydraulic pump 71, the first measuring cylinder 12 is connected to the outlet fluid of the hydraulic pump 71, the piston 121 is slidably embedded in the first measuring cylinder 12, and the first on-off valve 13 is arranged between the liquid reservoir 11 and the inlet of the hydraulic pump 71, and is used to control the opening and closing of the liquid flow path in the hydraulic pump 71. In a specific embodiment, the liquid reservoir 11 and the first measuring cylinder 12 are sealed and connected to the hydraulic pump 71 through the brake fluid pipe respectively, and the first on-off valve 13 is sealed and connected to the first pipeline 14 near the outlet of the liquid reservoir 11, and the first on-off valve 13 is preferably a stop valve.

[0027] Furthermore, the measuring unit includes a measuring component and a counting piece 41. The measuring component is connected to the first measuring cylinder 12 and is used to measure the change in the liquid in the first measuring cylinder 12, that is, the actual discharge volume of the hydraulic pump 71. The counting piece 41 is connected to the motor that drives the hydraulic pump 71 and is used to record the number of rotations of the motor, thereby obtaining the theoretical discharge volume of the hydraulic pump 71.

[0028] In a specific embodiment, the measuring assembly includes a second measuring cylinder 21 and a grating ruler 31 (grating displacement sensor), the second measuring cylinder 21 and the first measuring cylinder 12 are sealed and connected to provide load pressure for the side of the piston 121 away from the first measuring cylinder 12. The grating ruler 31 includes a grating ruler body 311 and a mounting block 312, the grating ruler body 311 and the piston rod of the piston 121 slidably embedded in the first measuring cylinder 12 are fixedly connected, the mounting block 312 is fixed in the second measuring cylinder 21, and the grating ruler body 311 and the mounting block 312 are transmission-connected. During the test, the grating ruler 31 is used to test the moving distance of the piston 121, that is, the change in the liquid in the first test cylinder. In another embodiment, the measuring assembly can also be a liquid level sensor or a flowmeter, etc. The grating ruler 31 is preferably used to improve the measurement accuracy, stability, response speed and anti-interference ability. Preferably, the counting member 41 is a speed encoder, and the counting member 41 can also be a speed sensor in the prior art.

[0029] Further, the load pressure simulation unit includes a pressure tank 22, a proportional valve 23 and a second pipeline 24. The pressure tank 22 is fluidically connected to the second measuring cylinder 21. The pressure tank 22 is used to generate the load pressure required for the test in the second measuring cylinder 21. The proportional valve 23 is fluidically connected between the pressure tank 22 and the second measuring cylinder 21, and is used to adjust the load pressure in the second measuring cylinder 21. In a specific embodiment, the pressure tank 22 is connected to the second measuring cylinder 21 through the second pipeline 24, and the proportional valve 23 is sealed on the second pipeline 24. Preferably, the pressure tank 22 is a pneumatic tank, the proportional valve 23 is an electrical proportional valve 23, and the second pipeline 24 is a compressed air pipe, which can quickly and sensitively provide load pressure. In another embodiment, the load pressure can also be provided by liquid.

[0030] Further, the calibration unit includes an electric cylinder 51, a second on-off valve 52 and a third on-off valve 53. The electric cylinder 51 is used to discharge gas in the hydraulic pump 71, the second on-off valve 52 is fluidically connected between the electric cylinder 51 and the inlet of the hydraulic pump 71, and the third on-off valve 53 is fluidically connected between the outlet of the hydraulic pump 71 and the liquid storage tank 11. Liquid is transported to the hydraulic pump 71 and the first pipeline 14 through the electric cylinder 51, and the hydraulic pump 71 and the first pipeline 14 are filled with liquid, thereby discharging gas in the hydraulic pump 71 and the first pipeline 14 in the test system. In a specific embodiment, the second on-off valve 52 and the third on-off valve 53 are preferably two-position two-way solenoid valves.

[0031] Preferably, a pressure sensor 61 is provided between the third on-off valve 53 and the first measuring cylinder 12 for sensing the liquid pressure in the first measuring cylinder 12 , and the load pressure required for the test is set by adjusting the proportional valve 23 .

[0032] During the test, first, close the first on-off valve 13, open the second on-off valve 52 and the third on-off valve 53, build up pressure for the test system through the electric cylinder 51, and fill the hydraulic pump 71 and the first pipeline 14 in the test system with liquid and circulate, so as to fully exhaust the test system; then, adjust the proportional valve 23, and the pressure tank 22 provides load pressure to the side of the piston 121 close to the second test cylinder through the second pipeline 24 and the second test cylinder, thereby providing load pressure for the first test cylinder, simulating the outlet load pressure of the hydraulic pump 71 when working; finally, close the second on-off valve 52 and the third on-off valve 53, open the first on-off valve 13, set parameters such as load pressure, and drive the hydraulic pump 71 through the motor to simulate the working state.

[0033] See also Figure 1 The principle of the utility model is described as follows: when the hydraulic pump 71 is working, it sucks liquids such as brake fluid from the liquid storage tank 11 to form a pressure liquid that is discharged to the first test cylinder, thereby pushing the piston 121 to move. The moving distance ΔL of the piston 121 is measured by measuring components such as a grating ruler 31 connected to the piston 121. The cross-sectional area of ​​the cylinder is S. The actual displacement Q1=S*ΔL within the target time ΔT is automatically calculated by a computer; at the same time, the number of rotations n of the motor used to drive the hydraulic pump 71 within the target time ΔT is calculated by a counting component 41 such as a speed encoder, thereby calculating the theoretical displacement Q2=V*n; finally, the computer automatically calculates the hydraulic pump efficiency η=Q1 / Q2 based on the measured parameters.

[0034] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic pump performance test system, characterized in that: The invention comprises a fluid storage tank (11) connected to the inlet fluid of the hydraulic pump, a first measuring cylinder (12) connected to the outlet fluid of the hydraulic pump, a piston (121) slidably embedded in the first measuring cylinder (12), a measuring component connected to the piston rod of the piston (121) for measuring the actual displacement of the hydraulic pump, and a counting member (41) arranged between the fluid storage tank (11) and the first measuring cylinder (12) for measuring the theoretical displacement of the hydraulic pump.

2. The hydraulic pump performance testing system according to claim 1, characterized in that: The measuring component comprises a grating ruler (31) for measuring the moving distance of the piston (121).

3. The hydraulic pump performance testing system according to claim 2, characterized in that: It also comprises a second measuring cylinder (21) which is sealedly connected to the first measuring cylinder (12) and is used to provide a load pressure to the side of the piston (121) away from the first measuring cylinder (12).

4. The hydraulic pump performance testing system according to claim 3, characterized in that: It also comprises a pressure tank (22), which is fluidically connected to the second measuring cylinder (21) and is used to generate a required load pressure in the second measuring cylinder (21).

5. The hydraulic pump performance testing system according to claim 4, characterized in that: It also includes a proportional valve (23), which is fluidically connected between the pressure tank (22) and the second measuring cylinder (21) and is used to adjust the load pressure in the second measuring cylinder (21).

6. The hydraulic pump performance testing system according to claim 3, characterized in that: The grating ruler (31) comprises a grating ruler body (311) connected to the piston rod of the piston (121) and a mounting block (312) fixedly mounted in the second measuring cylinder (21), and the grating ruler body (311) is transmission-connected to the mounting block (312).

7. The hydraulic pump performance testing system according to claim 1, characterized in that: It also includes a first on-off valve (13), which is arranged between the liquid storage tank (11) and the inlet of the hydraulic pump and is used to control the opening and closing of the liquid flow path in the hydraulic pump.

8. The hydraulic pump performance testing system according to claim 1, characterized in that: The invention also comprises an electric cylinder (51) for discharging gas in the hydraulic pump, a second on-off valve (52) fluidically connected between the electric cylinder (51) and the inlet of the hydraulic pump, and a third on-off valve (53) fluidically connected between the outlet of the hydraulic pump and the liquid storage tank (11).

9. The hydraulic pump performance testing system according to claim 8, characterized in that: It also includes a pressure sensor (61) arranged between the third on-off valve (53) and the first measuring cylinder (12), and the pressure sensor (61) is used to sense the liquid pressure in the first measuring cylinder (12).

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