A hydraulic pump loading test system

Abstract

The present disclosure proposes a hydraulic pump loading test system, including: a metering pump; a hydraulic motor, the liquid inlet end of the hydraulic motor is connected to the liquid outlet end of the metering pump; a relief valve, the liquid inlet end of the relief valve is connected to the liquid outlet end of the metering pump; a driving member, the power output end of the driving member is connected to the overflow pressure regulating end of the relief valve; a load, the power input end of the load is connected to the power output end of the hydraulic motor; a control device, the signal output end of the control device is electrically connected to the signal input end of the load and the signal input end of the driving member. In a hydraulic pump loading test system disclosed in the present disclosure, the control device controls the driving member according to the torque of the hydraulic motor to increase the overflow pressure of the relief valve, thereby increasing the liquid flow between the metering pump and the hydraulic motor, so that the hydraulic motor maintains the rated speed, and thereby ensures the accuracy of the loading test result while realizing the loading test of the metering pump.

Description

Technical Field

[0001] The present disclosure relates to the technical field of hydraulic pump loading test, and in particular to a hydraulic pump loading test system. Background Art

[0002] The hydraulic pump is the core hydraulic component of mechanical equipment. Its working characteristics directly affect the operating performance of the mechanical equipment. Therefore, it is necessary to perform a load test on the hydraulic pump to determine whether the performance of the hydraulic pump meets the requirements.

[0003] At present, most loading tests of hydraulic pumps use hydraulic motors as loading devices. During the test, the torque of the hydraulic motor is continuously adjusted to test the performance of the hydraulic pump. However, as the torque of the hydraulic motor increases, the speed of the hydraulic motor will gradually decrease or even decrease to zero. In addition, the speed of the hydraulic motor depends on the liquid flow between the hydraulic pump and the hydraulic motor. This makes loading tests difficult for fixed-displacement pumps that cannot adjust the flow. Summary of the invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, an object of the present disclosure is to provide a hydraulic pump loading test system.

[0006] To achieve the above-mentioned purpose, the present disclosure provides a hydraulic pump loading test system, comprising: a metering pump; a hydraulic motor, the liquid inlet end of the hydraulic motor is connected to the liquid outlet end of the metering pump; a relief valve, the liquid inlet end of the relief valve is connected to the liquid outlet end of the metering pump; a driving member, the power output end of the driving member is connected to the relief pressure regulating end of the relief valve; a load, the power input end of the load is connected to the power output end of the hydraulic motor; a control device, the signal output end of the control device is electrically connected to the signal input end of the load and the signal input end of the driving member, respectively, and the control device is used to control the load to adjust the torque of the hydraulic motor, and control the driving member according to the torque of the hydraulic motor to keep the hydraulic motor at a rated speed.

[0007] Optionally, the hydraulic pump loading test system also includes: a first flow sensor, which is arranged on the pipeline between the liquid inlet end of the hydraulic motor and the liquid outlet end of the metering pump; and a first pressure sensor, which is arranged on the pipeline between the liquid inlet end of the hydraulic motor and the liquid outlet end of the metering pump; wherein the signal input end of the control device is electrically connected to the signal output end of the first flow sensor and the signal output end of the first pressure sensor, respectively, and the control device controls the driving component according to the liquid pressure between the liquid inlet end of the hydraulic motor and the liquid outlet end of the metering pump to adjust the liquid flow between the liquid inlet end of the hydraulic motor and the liquid outlet end of the metering pump, thereby keeping the hydraulic motor at the rated speed.

[0008] Optionally, the hydraulic pump loading test system also includes: a second flow sensor, which is arranged on the pipeline at the fluid outlet end of the hydraulic motor; a second pressure sensor, which is arranged on the pipeline at the fluid outlet end of the hydraulic motor; wherein the signal input end of the control device is electrically connected to the signal output end of the second flow sensor and the signal output end of the second pressure sensor, respectively.

[0009] Optionally, the hydraulic pump loading test system also includes: a torque and speed sensor, the power input end of the torque and speed sensor is connected to the power output end of the hydraulic motor, and the power output end of the torque and speed sensor is connected to the power input end of the load; wherein the signal input end of the control device is electrically connected to the signal output end of the torque and speed sensor.

[0010] Optionally, the control device includes: a data acquisition card, a signal input end of the data acquisition card being electrically connected to a signal output end of the first flow sensor, a signal output end of the first pressure sensor, a signal output end of the second flow sensor, a signal output end of the second pressure sensor and a signal output end of the torque and speed sensor, respectively; a computer, a signal input end of the computer being electrically connected to a signal output end of the data acquisition card, and a signal output end of the computer being electrically connected to a signal input end of the load and a signal input end of the drive element, respectively.

[0011] Optionally, the load includes: a generator, wherein the power input terminal of the generator is connected to the power output terminal of the hydraulic motor, and the signal output terminal of the control device is electrically connected to the signal input terminal of the generator; and a feeding cabinet, wherein the power output terminal of the generator is electrically connected to the power input terminal of the feeding cabinet, and the power output terminal of the feeding cabinet is electrically connected to the power input terminal of the metering pump.

[0012] Optionally, the overflow valve includes: a valve body, a first chamber, a second chamber and a liquid passage are provided in the valve body, a liquid inlet and a liquid outlet are provided at one end of the first chamber and one end of the second chamber, the liquid inlet of the first chamber is connected to the liquid outlet end of the metering pump, the liquid inlet end of the liquid passage is connected to the liquid inlet of the first chamber, and the liquid outlet end of the liquid passage is respectively connected to the other end of the first chamber and the liquid inlet of the second chamber; a first valve core, the first valve core is slidably arranged in the first chamber; a first spring, the first spring is arranged between the first valve core and the cavity wall of the first chamber, the first spring makes the first valve core cut off the passage between the liquid inlet of the first chamber and the liquid outlet of the first chamber; a second valve core, the second valve core is slidably arranged in the second chamber; a second spring, the second spring is arranged between the second valve core and the power output end of the driving member, the second spring makes the second valve core cut off the passage between the liquid inlet of the second chamber and the liquid outlet of the second chamber, and the driving member is used to adjust the compression amount of the second spring.

[0013] Optionally, the overflow valve also includes: a guide sleeve, which is slidably disposed in the second chamber, one end of the guide sleeve is connected to an end of the second spring away from the second valve core, and the other end of the guide sleeve is threadedly connected to the power output end of the driving member, and the power output end of the driving member rotates to adjust the compression amount of the second spring.

[0014] Optionally, the overflow valve further includes: a solenoid valve, wherein a liquid inlet end of the solenoid valve is connected to a liquid outlet end of the liquid passage.

[0015] Optionally, the hydraulic pump loading test system also includes: a liquid storage tank, the liquid outlet end of the liquid storage tank is connected to the liquid inlet end of the metering pump, and the liquid inlet end of the liquid storage tank is connected to the liquid outlet end of the overflow valve; an accumulator, the energy conversion end of the accumulator is connected to the liquid outlet end of the metering pump; a reversing valve, the reversing valve includes: a first end, a second end, a third end and a fourth end, the first end of the reversing valve is connected to the liquid outlet end of the metering pump, the second end of the reversing valve is connected to the liquid inlet end of the liquid storage tank, the third end of the reversing valve is connected to the liquid inlet end of the hydraulic motor, and the fourth end of the reversing valve is connected to the liquid outlet end of the hydraulic motor; wherein, the first end of the reversing valve is connected to the third end of the reversing valve, and the second end of the reversing valve is connected to the fourth end of the reversing valve; or the first end of the reversing valve is connected to the fourth end of the reversing valve, and the second end of the reversing valve is connected to the third end of the reversing valve.

[0016] The technical solution provided by the present disclosure may have the following beneficial effects:

[0017] The metering pump conveys the liquid to the hydraulic motor under pressure to drive the power output end of the hydraulic motor to rotate, and the control device adjusts the torque of the hydraulic motor by controlling the load, thereby realizing the loading test of the metering pump; when the torque of the hydraulic motor increases, the liquid pressure between the metering pump and the hydraulic motor also increases accordingly. When the liquid pressure between the metering pump and the hydraulic motor is greater than the overflow pressure of the overflow valve, the overflow valve discharges the liquid between the metering pump and the hydraulic motor, and the control device controls the driving member according to the torque of the hydraulic motor to increase the overflow pressure of the overflow valve, thereby increasing the liquid flow between the metering pump and the hydraulic motor, so that the hydraulic motor maintains the rated speed, thereby realizing the loading test of the metering pump while ensuring the accuracy of the loading test result; wherein, the driving member adjusts the overflow pressure of the overflow valve so that the liquid flow regulation between the metering pump and the hydraulic motor has better linearity, which is convenient for automatic control, so that the overall stable regulation can still be achieved on the basis of the two variables of the hydraulic motor torque and the hydraulic motor speed, thereby ensuring the accuracy of the loading test result.

[0018] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a structural schematic diagram of a hydraulic pump loading test system proposed in an embodiment of the present disclosure;

[0021] Figure 2 is a cross-sectional schematic diagram of a relief valve in a hydraulic pump loading test system provided in an embodiment of the present disclosure;

[0022] Figure 3 is a partial cross-sectional schematic diagram of a relief valve in a hydraulic pump loading test system provided in an embodiment of the present disclosure;

[0023] Figure 4 is a curve diagram of pressure-flow in a hydraulic pump loading test system proposed in an embodiment of the present disclosure;

[0024] As shown in the figure: 1. quantitative pump, 2. hydraulic motor, 3. overflow valve, 4. driving part, 5. first flow sensor, 6. first pressure sensor, 7. second flow sensor, 8. second pressure sensor, 9. torque speed sensor, 10. data acquisition card, 11. computer, 12. generator, 13. feeder cabinet, 14. valve body, 15. first chamber, 16. second chamber, 17. liquid passage, 18. first valve core, 19. first spring, 20. second valve core, 21. second spring, 22. guide sleeve, 23. solenoid valve, 24. liquid storage tank, 25. accumulator, 26. reversing valve. DETAILED DESCRIPTION

[0025] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0026] like Figure 1 As shown, the embodiment of the present disclosure proposes a hydraulic pump loading test system, including a metering pump 1, a hydraulic motor 2, a relief valve 3, a driving member 4, a load and a control device, the liquid inlet end of the hydraulic motor 2 is connected to the liquid outlet end of the metering pump 1, the liquid inlet end of the relief valve 3 is connected to the liquid outlet end of the metering pump 1, the power output end of the driving member 4 is connected to the overflow pressure regulating end of the relief valve 3, the power input end of the load is connected to the power output end of the hydraulic motor 2, the signal output end of the control device is electrically connected to the signal input end of the load and the signal input end of the driving member 4, respectively, the control device is used to control the load to adjust the torque of the hydraulic motor 2, and control the driving member 4 according to the torque of the hydraulic motor 2 to keep the hydraulic motor 2 at a rated speed.

[0027] It is understandable that the metering pump 1 delivers pressurized liquid to the hydraulic motor 2 to drive the power output end of the hydraulic motor 2 to rotate, and the control device adjusts the torque of the hydraulic motor 2 by controlling the load, thereby realizing a load test on the metering pump 1.

[0028] When the torque of the hydraulic motor 2 increases, the liquid pressure between the metering pump 1 and the hydraulic motor 2 also increases. When the liquid pressure between the metering pump 1 and the hydraulic motor 2 is greater than the overflow pressure of the overflow valve 3, the overflow valve 3 discharges the liquid between the metering pump 1 and the hydraulic motor 2, and the control device controls the driving member 4 according to the torque of the hydraulic motor 2 to increase the overflow pressure of the overflow valve 3, thereby increasing the liquid flow between the metering pump 1 and the hydraulic motor 2, so that the hydraulic motor 2 maintains the rated speed, thereby achieving the loading test of the metering pump 1 while ensuring the accuracy of the loading test result.

[0029] Among them, the driving component 4 adjusts the overflow pressure of the overflow valve 3, so that the liquid flow regulation between the metering pump 1 and the hydraulic motor 2 has better linearity, which is convenient for automatic control, so that the overall stable regulation can still be achieved on the basis of the two variables of the torque of the hydraulic motor 2 and the speed of the hydraulic motor 2, thereby ensuring the accuracy of the loading test results.

[0030] It should be noted that, for the metering pump 1, when the pump shaft rotates one circle, the volume (displacement) of the liquid discharged by the pump remains fixed.

[0031] The liquid can be an emulsion, then the metering pump 1 is an emulsion pump, and the hydraulic motor 2 is an emulsion motor. The emulsion pump is usually a metering pump 1, which cannot adjust the flow rate, and the nominal flow rate of the emulsion pump is large, for example: 1250L / min, while the nominal flow rate of the emulsion motor is small, for example: 100L / min, therefore, the overflow valve 3 not only plays the role of regulating the flow rate, but also plays the role of diversion. Among them, the nominal flow rate refers to the maximum flow rate of the fluid flowing through a certain cross section per unit time under rated working conditions.

[0032] The liquid may also be other media, such as hydraulic oil, etc.

[0033] The function of the relief valve 3 is usually to relieve pressure, but if Figure 4 As shown, the horizontal axis is the liquid flow (q) between the metering pump 1 and the hydraulic motor 2, and the vertical axis is the overflow pressure (p) of the overflow valve 3. p1 is a direct-acting overflow valve, and p2 is a pilot-operated overflow valve. It can be seen from the figure that no matter it is a direct-acting overflow valve or a pilot-operated overflow valve, the greater the overflow pressure, the greater the liquid flow between the metering pump 1 and the hydraulic motor 2, and the smaller the overflow pressure, the smaller the liquid flow between the metering pump 1 and the hydraulic motor 2. There is good linearity between the overflow pressure and the liquid flow. Therefore, by adjusting the overflow pressure of the overflow valve 3, the accurate adjustment of the liquid flow between the metering pump 1 and the hydraulic motor 2 can be achieved.

[0034] like Figure 1As shown, in some embodiments, the hydraulic pump loading test system further includes a first flow sensor 5 and a first pressure sensor 6, the first flow sensor 5 is arranged on a pipeline between the liquid inlet end of the hydraulic motor 2 and the liquid outlet end of the metering pump 1, and the first pressure sensor 6 is arranged on a pipeline between the liquid inlet end of the hydraulic motor 2 and the liquid outlet end of the metering pump 1;

[0035] Among them, the signal input end of the control device is electrically connected to the signal output end of the first flow sensor 5 and the signal output end of the first pressure sensor 6 respectively. The control device controls the driving component 4 according to the liquid pressure between the liquid inlet end of the hydraulic motor 2 and the liquid outlet end of the metering pump 1 to adjust the liquid flow between the liquid inlet end of the hydraulic motor 2 and the liquid outlet end of the metering pump 1, thereby keeping the hydraulic motor 2 at the rated speed.

[0036] It can be understood that the first flow sensor 5 detects the liquid flow between the inlet end of the hydraulic motor 2 and the outlet end of the metering pump 1, and the first flow sensor 5 converts the detected liquid flow into a flow electrical signal and sends it to the control device, the first pressure sensor 6 detects the liquid pressure between the inlet end of the hydraulic motor 2 and the outlet end of the metering pump 1, and the first pressure sensor 6 converts the detected liquid pressure into a pressure electrical signal and sends it to the control device, and when the control device controls the load to adjust the torque of the hydraulic motor 2, the pressure electrical signal also changes accordingly, therefore, the control device controls the action of the driving member 4 according to the received pressure electrical signal, so that the driving member 4 adjusts the overflow pressure of the overflow valve 3, and then adjusts the liquid flow between the inlet end of the hydraulic motor 2 and the outlet end of the metering pump 1, and while adjusting the flow, the control device monitors the liquid flow between the inlet end of the hydraulic motor 2 and the outlet end of the metering pump 1 according to the received flow electrical signal, so that the liquid flow between the inlet end of the hydraulic motor 2 and the outlet end of the metering pump 1 can accurately reach the flow value that maintains the rated speed of the hydraulic motor 2. Thus, accurate adjustment of the liquid flow between the inlet end of the hydraulic motor 2 and the outlet end of the metering pump 1 is achieved.

[0037] like Figure 1 As shown, in some embodiments, the hydraulic pump loading test system further includes a second flow sensor 7 and a second pressure sensor 8, the second flow sensor 7 is arranged on the pipeline at the outlet end of the hydraulic motor 2, and the second pressure sensor 8 is arranged on the pipeline at the outlet end of the hydraulic motor 2;

[0038] The signal input end of the control device is electrically connected to the signal output end of the second flow sensor 7 and the signal output end of the second pressure sensor 8 respectively.

[0039] It can be understood that the second flow sensor 7 detects the liquid flow at the liquid outlet end of the hydraulic motor 2, and the second flow sensor 7 converts the detected liquid flow into a flow electrical signal and sends it to the control device, the second pressure sensor 8 detects the liquid pressure at the liquid outlet end of the hydraulic motor 2, and the second pressure sensor 8 converts the detected liquid pressure into a pressure electrical signal and sends it to the control device. Therefore, through the setting of the second flow sensor 7 and the second pressure sensor 8, the control device can monitor the quantitative pump 1 and the hydraulic motor 2 more accurately and stably.

[0040] It should be noted that the specific types of the first flow sensor 5, the second flow sensor 7, the first pressure sensor 6 and the second pressure sensor 8 can be set according to actual needs and are not limited here.

[0041] like Figure 1 As shown, in some embodiments, the hydraulic pump loading test system further includes a torque speed sensor 9, the power input end of the torque speed sensor 9 is connected to the power output end of the hydraulic motor 2, and the power output end of the torque speed sensor 9 is connected to the power input end of the load;

[0042] The signal input terminal of the control device is electrically connected to the signal output terminal of the torque and speed sensor 9 .

[0043] It can be understood that the torque and speed sensor 9 detects the torque and speed of the power output end of the hydraulic motor 2, and the torque and speed sensor 9 converts the detected torque and speed into torque electrical signals and speed electrical signals respectively and sends them to the control device. The control device controls the load to adjust the torque of the hydraulic motor 2, and monitors the torque of the hydraulic motor 2 according to the received torque electrical signal so that the torque of the hydraulic motor 2 can accurately reach the preset torque value. The control device controls the drive 4 to adjust the speed of the hydraulic motor 2, and monitors the speed of the hydraulic motor 2 according to the received speed electrical signal so that the speed of the hydraulic motor 2 can accurately reach the rated speed.

[0044] It should be noted that at the rated speed, the liquid flow value detected by the first flow sensor 5 should correspond to the rated speed value. Taking into account that the liquid flow value will have a slight deviation during the actual loading test, when adjusting the speed of the hydraulic motor 2, the control device can use the speed electrical signal output by the torque speed sensor 9 as the standard.

[0045] The specific type of the torque and speed sensor 9 can be set according to actual needs and is not limited here.

[0046] Since there are two variables, torque and rotation speed, during the loading test of the metering pump 1, and the two variables affect each other, when controlled by the control device, the two variables should be decoupled and controlled.

[0047] For example: directly establish a mathematical model between torque and speed for decoupling control. This method is suitable for working conditions where the model of the metering pump 1 is fixed. If there are many models of metering pumps 1 that need to be loaded and tested, more mathematical models need to be established, resulting in higher loading and testing costs for the metering pumps 1.

[0048] It is also possible to use an intelligent control algorithm for decoupling control based on feedback, with the torque and speed parameters as target values. The intelligent control algorithm may be a PID (Proportional-Integral-Differential) neural network decoupling control algorithm or the like.

[0049] The formula torque (Nm) = flow (ml / rev) × pressure (MPa) × mechanical efficiency (coefficient) can also be used. Flow refers to the liquid flow at the outlet of the hydraulic motor 2, which is a fixed value and can be obtained by the second flow sensor 7. Pressure refers to the liquid pressure between the inlet of the hydraulic motor 2 and the outlet of the metering pump 1, which can be obtained by the first pressure sensor 6. Mechanical efficiency can be obtained through experimental measurement or through past experience, and it also approaches a fixed value. Therefore, after setting the torque value, the pressure is also determined. The control device controls the driving member 4 according to the pressure to make the hydraulic motor 2 reach the rated speed. Among them, the control device can also be controlled using intelligent control algorithms such as PID neural network decoupling control algorithm, thereby decoupling the torque and speed to achieve decoupling control.

[0050] like Figure 1 As shown, in some embodiments, the control device includes a data acquisition card 10 and a computer 11, the signal input end of the data acquisition card 10 is electrically connected to the signal output end of the first flow sensor 5, the signal output end of the first pressure sensor 6, the signal output end of the second flow sensor 7, the signal output end of the second pressure sensor 8 and the signal output end of the torque and speed sensor 9, the signal input end of the computer 11 is electrically connected to the signal output end of the data acquisition card 10, and the signal output end of the computer 11 is electrically connected to the signal input end of the load and the signal input end of the driving member 4.

[0051] It can be understood that the flow electrical signal output by the first flow sensor 5, the flow electrical signal output by the second flow sensor 7, the pressure electrical signal output by the first pressure sensor 6, the pressure electrical signal output by the second pressure sensor 8, the torque electrical signal output by the torque-speed sensor 9, and the speed electrical signal output by the torque-speed sensor 9 are all sent to the computer 11 through the data acquisition card 10. The computer 11 adjusts the torque and speed of the hydraulic motor 2 according to the received flow electrical signal, pressure electrical signal, torque electrical signal and speed electrical signal to ensure stable and accurate testing of the quantitative pump 1.

[0052] It should be noted that the data acquisition card 10 is an expansion card of the computer 11 for realizing the data acquisition function, which has a connection port compatible with the first flow sensor 5, the first pressure sensor 6, the second flow sensor 7, the second pressure sensor 8 and the torque and speed sensor 9, and is electrically connected to the computer 11 through a bus.

[0053] like Figure 1 As shown, in some embodiments, the load includes a generator 12 and a feeder cabinet 13, the power input end of the generator 12 is connected to the power output end of the hydraulic motor 2, the signal output end of the control device is electrically connected to the signal input end of the generator 12, the power output end of the generator 12 is electrically connected to the power input end of the feeder cabinet 13, and the power output end of the feeder cabinet 13 is electrically connected to the power input end of the metering pump 1.

[0054] It can be understood that the control device adjusts the torque of the hydraulic motor 2 by controlling the torque of the generator 12, and while the generator 12 serves as a load for the hydraulic motor 2, it generates electricity driven by the hydraulic motor 2, and the electricity is converted by the feeder cabinet 13 to power the metering pump 1, thereby realizing power recovery, thereby reducing the power loss of the loading test system and effectively reducing the cost of the loading test of the metering pump 1.

[0055] It should be noted that the metering pump 1 is driven by a motor, and the feed cabinet 13 can be a distribution cabinet, which is provided with electrical components such as a transformer, an air switch, a voltage transformer, and a current transformer. The feed cabinet 13 sends the power output by the generator 12 to the motor for use after voltage reduction and conversion according to the power demand of the motor, so as to drive the metering pump 1 to operate. At the same time, due to energy loss, the power output by the feed cabinet 13 cannot meet the use of the motor, so it is necessary to power the motor through an external power supply. Among them, the feed cabinet 13 outputs three-phase electricity to the motor.

[0056] The load can also be non-power recovery equipment such as magnetic powder brakes.

[0057] like Figure 2 and Figure 3As shown, in some embodiments, the overflow valve 3 includes a valve body 14, a first valve core 18, a first spring 19, a second valve core 20 and a second spring 21. The valve body 14 is provided with a first chamber 15, a second chamber 16 and a liquid passage 17. One end of the first chamber 15 and one end of the second chamber 16 are provided with a liquid inlet and a liquid outlet. The liquid inlet of the first chamber 15 is connected to the liquid outlet end of the metering pump 1, the liquid inlet end of the liquid passage 17 is connected to the liquid inlet of the first chamber 15, and the liquid outlet end of the liquid passage 17 is respectively connected to the other end of the first chamber 15 and the liquid inlet of the second chamber 16. The first valve core 18 is slidably disposed in the first chamber 15, the first spring 19 is disposed between the first valve core 18 and the cavity wall of the first chamber 15, the first spring 19 enables the first valve core 18 to cut off the passage between the liquid inlet of the first chamber 15 and the liquid outlet of the first chamber 15, the second valve core 20 is slidably disposed in the second chamber 16, the second spring 21 is disposed between the second valve core 20 and the power output end of the driving member 4, the second spring 21 enables the second valve core 20 to cut off the passage between the liquid inlet of the second chamber 16 and the liquid outlet of the second chamber 16, and the driving member 4 is used to adjust the compression amount of the second spring 21.

[0058] It can be understood that part of the liquid output of the metering pump 1 enters one end of the first valve core 18 in the first chamber 15 through the liquid inlet of the first chamber 15, and part of the liquid output of the metering pump 1 passes through the liquid inlet and the liquid passage 17 of the first chamber 15 in sequence and then enters the other end of the first valve core 18 in the first chamber 15, so that the pressures at both ends of the first valve core 18 in the first chamber 15 are balanced, and due to the action of the first spring 19, the first valve core 18 does not move, and the passage between the liquid inlet of the first chamber 15 and the liquid outlet of the first chamber 15 is cut off. At the same time, part of the liquid output of the metering pump 1 passes through the liquid inlet and the liquid passage 17 of the first chamber 15 in sequence and then enters the liquid inlet of the second chamber 16, and under the action of the second spring 21, the first valve core 18 does not move, and the passage between the liquid inlet of the second chamber 16 and the liquid outlet of the second chamber 16 is cut off.

[0059] When the liquid outlet pressure of the metering pump 1 is too large, the liquid pressure at the liquid inlet of the second chamber 16 overcomes the elastic force of the second spring 21 to move the second valve core 20. The movement of the second valve core 20 connects the liquid inlet and the liquid outlet of the second chamber 16. Since the liquid inlet of the second chamber 16 is connected to the first chamber 15 through the liquid outlet end of the liquid passage 17, the liquid pressure at the end of the first valve core 18 in the first chamber 15 close to the liquid inlet is much greater than the liquid pressure at the end of the first valve core 18 away from the liquid inlet. As a result, the liquid pressure at the liquid inlet of the first chamber 15 overcomes the elastic force of the first spring 19 to move the first valve core 18. The movement of the first valve core 18 connects the liquid inlet and the liquid outlet of the first chamber 15, thereby realizing pressure relief and diversion.

[0060] When the outlet pressure of the metering pump 1 is too small, the elastic force of the second spring 21 resets the second valve core 20, and the second valve core 20 cuts off the passage between the liquid inlet of the second chamber 16 and the liquid outlet of the second chamber 16. The elastic force of the first spring 19 resets the first valve core 18, and the first valve core 18 cuts off the passage between the liquid inlet of the first chamber 15 and the liquid outlet of the second chamber 16.

[0061] The driving member 4 is actuated to adjust the compression amount of the second spring 21 , thereby adjusting the liquid pressure that can overcome the elastic force of the second spring 21 , and further achieving the adjustment of the liquid flow between the metering pump 1 and the hydraulic motor 2 .

[0062] It should be noted that the diameter of the second chamber 16 is smaller than the diameter of the first chamber 15, and the diameter of the liquid passage 17 is smaller than the diameter of the second chamber 16. A damping hole with a smaller diameter may be provided in the liquid passage 17 to ensure that when the liquid inlet and the liquid outlet of the second chamber 16 are connected, the liquid pressure at the end of the first valve core 18 close to the liquid inlet is much greater than the liquid pressure at the end of the first valve core 18 away from the liquid inlet. The sizes of the first chamber 15, the second chamber 16 and the liquid passage 17 can be set according to actual needs and are not limited here.

[0063] The second valve core 20 can realize the blocking and connection of the passage between the liquid inlet of the second chamber 16 and the liquid outlet of the second chamber 16 through the ceramic ball.

[0064] Since the force for adjusting the expansion and contraction amount of the second spring 21 is small and the action area is small, it is convenient to select the driving member 4 and can effectively reduce the volume of the relief valve 3. The driving member 4 can be arranged on the relief valve 3 by fixing members such as bolts, and the driving member 4 can be a motor such as a stepping motor, a servo motor, or can be driven by a proportional electromagnet.

[0065] like Figure 3 As shown, in some embodiments, the relief valve 3 also includes a guide sleeve 22, which is slidably disposed in the second chamber 16, one end of the guide sleeve 22 is connected to an end of the second spring 21 away from the second valve core 20, and the other end of the guide sleeve 22 is threadedly connected to the power output end of the driving member 4, and the power output end of the driving member 4 rotates to adjust the compression amount of the second spring 21.

[0066] It can be understood that the power output end of the driving member 4 rotates to move the guide sleeve 22 in the second chamber 16. Since the second spring 21 is arranged between the second valve core 20 and the guide sleeve 22, the linear adjustment of the compression amount of the second spring 21 is achieved.

[0067] It should be noted that the power output end of the driving member 4 is inserted from the outside of the valve body 14 into the second chamber 16, and a sealing member should be provided at the insertion location.

[0068] like Figure 2As shown, in some embodiments, the overflow valve 3 further includes a solenoid valve 23 , and a liquid inlet end of the solenoid valve 23 is connected to a liquid outlet end of the liquid passage 17 .

[0069] It can be understood that when the metering pump 1 is turned on, the solenoid valve 23 is opened, and the liquid output of the metering pump 1 is discharged after passing through the liquid inlet of the first chamber 15, the liquid passage 17 and the solenoid valve 23 in sequence, thereby realizing the no-load starting of the metering pump 1 and preventing the metering pump 1 from causing a large impact on the motor, power grid, etc. that drive the metering pump 1 due to insufficient starting power.

[0070] After the metering pump 1 is started without load, the electromagnetic valve 23 is closed, so that the overflow valve 3 plays the role of regulating the flow and relieving pressure and diverting the flow.

[0071] It should be noted that the solenoid valve 23 may be a solenoid switch valve, or other valves such as a pilot-operated solenoid valve.

[0072] like Figure 1 As shown, in some embodiments, the hydraulic pump loading test system further includes a liquid storage tank 24, an accumulator 25 and a reversing valve 26, the liquid outlet end of the liquid storage tank 24 is connected to the liquid inlet end of the metering pump 1, the liquid inlet end of the liquid storage tank 24 is connected to the liquid outlet end of the overflow valve 3, the reversing end of the accumulator 25 is connected to the liquid outlet end of the metering pump 1, the reversing valve 26 includes a first end, a second end, a third end and a fourth end, the first end of the reversing valve 26 is connected to the liquid outlet end of the metering pump 1, the second end of the reversing valve 26 is connected to the liquid inlet end of the liquid storage tank 24, the third end of the reversing valve 26 is connected to the liquid inlet end of the hydraulic motor 2, and the fourth end of the reversing valve 26 is connected to the liquid outlet end of the hydraulic motor 2;

[0073] Among them, the first end of the reversing valve 26 is connected to the third end of the reversing valve 26, the second end of the reversing valve 26 is connected to the fourth end of the reversing valve 26, or the first end of the reversing valve 26 is connected to the fourth end of the reversing valve 26, and the second end of the reversing valve 26 is connected to the third end of the reversing valve 26.

[0074] The liquid inlet end of the liquid storage tank 24 is also connected to the liquid outlet end of the solenoid valve 23 , the liquid outlet of the first chamber 15 , and the liquid outlet of the second chamber 16 .

[0075] It can be understood that by setting the reversing valve 26, the direction of the hydraulic motor 2 between the inlet and outlet is changed, so that the forward and reverse switching of the hydraulic motor 2 is realized without adjusting the metering pump 1, thereby ensuring the stable loading test of the metering pump 1; by setting the liquid storage tank 24, the liquid supply to the metering pump 1 and the return of the hydraulic motor 2 and the overflow valve 3 are realized; by setting the accumulator 25, the liquid pressure therein is more stable when the hydraulic pump loading test system is running.

[0076] It should be noted that the accumulator 25 is an energy storage device, which converts the energy in the hydraulic pump loading test system into compression energy or potential energy and stores it at an appropriate time. When the hydraulic pump loading test system needs it, it converts the compression energy or potential energy into hydraulic energy and releases it to replenish the hydraulic pump loading test system.

[0077] The reversing valve 26 can be a manual valve or an electric valve. When the reversing valve 26 is an electric valve, it can be controlled by the computer 11 .

[0078] In the description of the present disclosure, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0079] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0081] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A hydraulic pump loading test system, characterized in that: include: Dosing pump; A hydraulic motor, wherein a fluid inlet end of the hydraulic motor is connected to a fluid outlet end of the metering pump; A relief valve, wherein the liquid inlet end of the relief valve is connected to the liquid outlet end of the metering pump; A driving member, wherein a power output end of the driving member is connected to an overflow pressure regulating end of the overflow valve; A load, a power input end of the load is connected to a power output end of the hydraulic motor; A first pressure sensor, wherein the first pressure sensor is arranged on a pipeline between a liquid inlet end of the hydraulic motor and a liquid outlet end of the quantitative pump; A control device, wherein a signal output end of the control device is electrically connected to a signal input end of the load and a signal input end of the driving member, respectively. The control device is used to control the load to adjust the torque of the hydraulic motor. The first pressure sensor converts the detected liquid pressure into a pressure electric signal and sends it to the control device. When the control device controls the load to adjust the torque of the hydraulic motor, the pressure electric signal also changes accordingly. The control device controls the action of the driving member according to the received pressure electric signal. The control device controls the driving member according to the liquid pressure between the liquid inlet end of the hydraulic motor and the liquid outlet end of the quantitative pump, so as to adjust the liquid flow between the liquid inlet end of the hydraulic motor and the liquid outlet end of the quantitative pump, thereby maintaining the rated speed of the hydraulic motor; The hydraulic pump loading test system also includes: A torque and speed sensor, wherein the power input end of the torque and speed sensor is connected to the power output end of the hydraulic motor, and the power output end of the torque and speed sensor is connected to the power input end of the load, and the control device decouples the torque and speed to achieve decoupling control.

2. The hydraulic pump loading test system according to claim 1, characterized in that: The hydraulic pump loading test system also includes: A first flow sensor, which is arranged on a pipeline between a liquid inlet end of the hydraulic motor and a liquid outlet end of the quantitative pump; Wherein, the signal input end of the control device is electrically connected to the signal output end of the first flow sensor and the signal output end of the first pressure sensor respectively.

3. The hydraulic pump loading test system according to claim 2, characterized in that: The hydraulic pump loading test system also includes: A second flow sensor, the second flow sensor is arranged on the pipeline at the outlet end of the hydraulic motor; A second pressure sensor, wherein the second pressure sensor is arranged on a pipeline at a fluid outlet end of the hydraulic motor; Wherein, the signal input end of the control device is electrically connected to the signal output end of the second flow sensor and the signal output end of the second pressure sensor respectively.

4. The hydraulic pump loading test system according to claim 3, characterized in that: The signal input end of the control device is electrically connected to the signal output end of the torque and speed sensor.

5. The hydraulic pump loading test system according to claim 4, characterized in that: The control device comprises: A data acquisition card, wherein a signal input end of the data acquisition card is electrically connected to a signal output end of the first flow sensor, a signal output end of the first pressure sensor, a signal output end of the second flow sensor, a signal output end of the second pressure sensor, and a signal output end of the torque and speed sensor; A computer, wherein a signal input terminal of the computer is electrically connected to a signal output terminal of the data acquisition card, and a signal output terminal of the computer is electrically connected to a signal input terminal of the load and a signal input terminal of the driving component respectively.

6. The hydraulic pump loading test system according to claim 1, characterized in that: The load includes: A generator, wherein a power input end of the generator is connected to a power output end of the hydraulic motor, and a signal output end of the control device is electrically connected to a signal input end of the generator; A feed cabinet, wherein the power output end of the generator is electrically connected to the power input end of the feed cabinet, and the power output end of the feed cabinet is electrically connected to the power input end of the metering pump.

7. The hydraulic pump loading test system according to claim 1, characterized in that: The relief valve comprises: A valve body, wherein a first chamber, a second chamber and a liquid passage are provided in the valve body, a liquid inlet and a liquid outlet are provided at one end of the first chamber and one end of the second chamber, the liquid inlet of the first chamber is connected to the liquid outlet of the metering pump, the liquid inlet of the liquid passage is connected to the liquid inlet of the first chamber, and the liquid outlet of the liquid passage is respectively connected to the other end of the first chamber and the liquid inlet of the second chamber; a first valve core, the first valve core being slidably disposed in the first chamber; a first spring, the first spring being arranged between the first valve core and the cavity wall of the first chamber, the first spring enabling the first valve core to cut off a passage between a liquid inlet of the first chamber and a liquid outlet of the first chamber; a second valve core, the second valve core being slidably disposed in the second chamber; The second spring is arranged between the second valve core and the power output end of the driving member, the second spring enables the second valve core to cut off the passage between the second chamber liquid inlet and the second chamber liquid outlet, and the driving member is used to adjust the compression amount of the second spring.

8. The hydraulic pump loading test system according to claim 7, characterized in that: The relief valve also includes: A guide sleeve, wherein the guide sleeve is slidably disposed in the second chamber, one end of the guide sleeve is connected to an end of the second spring away from the second valve core, and the other end of the guide sleeve is threadedly connected to the power output end of the driving member, and the power output end of the driving member rotates to adjust the compression amount of the second spring.

9. The hydraulic pump loading test system according to claim 7, characterized in that: The relief valve also includes: A solenoid valve, wherein a liquid inlet end of the solenoid valve is connected to a liquid outlet end of the liquid passage.

10. The hydraulic pump loading test system according to any one of claims 1 to 9, characterized in that: The hydraulic pump loading test system also includes: A liquid storage tank, wherein the liquid outlet end of the liquid storage tank is connected to the liquid inlet end of the metering pump, and the liquid inlet end of the liquid storage tank is connected to the liquid outlet end of the overflow valve; An accumulator, wherein an energy conversion end of the accumulator is connected to a liquid outlet end of the metering pump; A reversing valve, the reversing valve comprising: a first end, a second end, a third end and a fourth end, the first end of the reversing valve being connected to the liquid outlet end of the metering pump, the second end of the reversing valve being connected to the liquid inlet end of the liquid storage tank, the third end of the reversing valve being connected to the liquid inlet end of the hydraulic motor, and the fourth end of the reversing valve being connected to the liquid outlet end of the hydraulic motor; Wherein, the first end of the reversing valve is connected to the third end of the reversing valve, and the second end of the reversing valve is connected to the fourth end of the reversing valve; or The first end of the reversing valve is connected to the fourth end of the reversing valve, and the second end of the reversing valve is connected to the third end of the reversing valve.

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