Dynamic performance test system for load-sensitive variable pump

Abstract

The invention discloses a dynamic performance testing system for a load-sensitive variable pump. The dynamic performance testing system comprises a tested pump, a driving assembly, a flow adjusting assembly, a loading pressure adjusting assembly and a flow measuring assembly. The output of the tested pump is connected with the flow adjusting assembly, and whether the output flow of the tested pump can respond in time or not is tested when the size of a throttling opening changes rapidly through rapid switching of the opening of the throttling opening of the tested pump. The loading pressure adjusting assembly is connected with an outlet of the flow adjusting assembly, and the loading pressure of the tested pump is adjusted through the loading pressure adjusting assembly so as to test the stability of the output flow of the tested pump when the loading pressure changes; the flow measuring assembly is arranged at an outlet of the pressure adjusting assembly and used for detecting changes of the output flow of the hydraulic pump in real time. According to the scheme, actual working conditions are simulated through two methods of step switching of the opening degree of the outlet throttle valve of the tested load sensitive pump and step switching of the loading pressure of the tested pump, and the dynamic performance of the tested pump is tested.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic testing, and in particular to a dynamic performance testing system for a load-sensitive variable displacement pump. Background Art

[0002] Theoretically, the characteristic of a load-sensitive variable pump is that the output flow of the pump is determined by the size of the throttle valve opening set at its outlet, and the output flow can be kept stable when the load changes. The performance of an actual load-sensitive variable pump will deviate from the theory to varying degrees. Rapid flow adjustment and rapid load change are common working conditions in the actual application of load-sensitive variable pumps. When the size of the throttle changes, can the output flow respond in time? When the load changes, can the output flow remain stable? These two performances reflect the advantages and disadvantages of the dynamic characteristics of the load-sensitive variable pump. The current variable hydraulic pump test standards, including JB / T 7041.1-2023 "Hydraulic Pump Part 1: Vane Pump" and JB / T 7041.3-2023 "Hydraulic Pump Part 3: Piston Pump", do not propose test content related to the dynamic characteristics of load-sensitive variable pumps.

[0003] It can be seen that providing a method for dynamic performance testing of a load-sensitive variable displacement pump is a problem that needs to be solved in the art. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a load-sensitive variable pump dynamic performance test system, which tests the dynamic performance of the load-sensitive variable pump through a "throttle switching-output flow response" test and a "loading pressure switching-output flow stability" test, and proposes a test circuit, which effectively overcomes the problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a load-sensitive variable pump dynamic performance test system, including a test pump and a driving component for driving the test pump, and also including a flow regulating component, a loading pressure regulating component and a flow measuring component; the test pump output is connected to the flow regulating component, and through the rapid switching of the throttle opening size of the test pump, when the throttle size changes rapidly, the output flow size of the test pump can be tested to respond in time; the loading pressure regulating component is connected to the outlet of the flow regulating component, and the loading pressure of the test pump is adjusted by the loading pressure regulating component to test the stability of the output flow of the test pump when the loading pressure changes; the flow measuring component is arranged at the outlet of the pressure regulating component, and is used to detect the change of the output flow of the hydraulic pump in real time.

[0006] Furthermore, the flow regulating assembly includes a first two-way cartridge valve assembly, a second two-way cartridge valve assembly, and a first reversing valve. The first reversing valve controls the opening or closing of the first two-way cartridge valve assembly and the second two-way cartridge valve assembly to achieve switching of throttling functions with different opening degrees.

[0007] Furthermore, the first two-way cartridge valve assembly includes a first two-way cartridge valve core and a first two-way cartridge valve cover plate, and an adjusting screw on the first two-way cartridge valve cover plate can adjust the opening of the first two-way cartridge valve core.

[0008] Furthermore, the second two-way cartridge valve assembly includes a second two-way cartridge valve core and a second two-way cartridge valve cover plate, and the adjusting screw on the second two-way cartridge valve cover plate can adjust the opening size of the second two-way cartridge valve core.

[0009] Furthermore, the flow regulating component is provided with a first pressure sensor, which is arranged at the inlet of the flow regulating component and is used to detect the inlet pressure of the flow regulating component, that is, the outlet pressure of the load sensitive variable pump under test.

[0010] Furthermore, the loading pressure regulating assembly includes a third two-way cartridge valve assembly, a second reversing valve, a first overflow valve, and a second overflow valve. The first overflow valve and the second overflow valve are respectively set with different loading pressures, and cooperate with the second reversing valve to switch the connection between the first overflow valve or the second overflow valve to switch the loading of different pressures.

[0011] Furthermore, the third two-way cartridge valve assembly comprises a third two-way cartridge valve core and a third two-way cartridge valve cover plate, and the third two-way cartridge valve cover plate is provided with an overflow valve for use as a safety valve.

[0012] Furthermore, the first overflow valve is used to set high-pressure loading, and the second overflow valve is used for low-pressure loading. By controlling the change of the action of the second reversing valve, the corresponding high-pressure loading set by the first overflow valve, the low-pressure loading set by the second overflow valve, and no-load are switched respectively to achieve different loading pressure switching.

[0013] Furthermore, the loading pressure regulating assembly is provided with a second pressure sensor, which is arranged at the inlet of the pressure regulating assembly and is used to detect the inlet pressure of the pressure regulating assembly, that is, the pressure of the load pressure feedback port of the load sensitive variable pump.

[0014] Furthermore, the flow detection component includes a third pressure sensor and a throttle valve, and the third pressure sensor is used to detect the change in the inlet pressure of the throttle valve, thereby indirectly measuring the change in the output flow of the pump. The load-sensitive variable pump dynamic performance test system provided by the present invention simulates actual working conditions and tests the dynamic performance of the tested pump by two methods: step-switching the opening size of the outlet throttle valve of the tested load-sensitive pump and step-switching the loading pressure size of the tested pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 Schematic diagram of the load-sensitive variable pump dynamic performance test system.

[0017] The following is a description of the components in the accompanying drawings:

[0018] 1. Oil tank 2. Electric motor 3. Test pump 41. First pressure sensor 42. Second pressure sensor 43. Third pressure sensor 51. First two-way cartridge valve core 52. First two-way cartridge valve cover plate 53. Second two-way cartridge valve core 54. Second two-way cartridge valve cover plate 55. Third two-way cartridge valve core 56. Third two-way cartridge valve cover plate 6. First reversing valve 7. Throttle valve 8. First overflow valve 9. Second overflow valve 10. Second reversing valve. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0020] In view of the problems existing in the prior art, the present invention proposes to test the dynamic performance of a load-sensitive variable pump through a "throttle port switching-output flow response" test and a "loading pressure switching-output flow stability" test, and provides a load-sensitive variable pump dynamic performance test system. It performs an output flow switching response test on the load-sensitive variable pump by step-switching the opening size of the outlet throttle port of the tested load-sensitive pump; and performs an output flow stability test on the load-sensitive variable pump by step-switching the loading pressure size of the tested pump, thereby detecting the dynamic performance of the load-sensitive variable pump.

[0021] See also Figure 1 The load-sensitive variable pump dynamic performance test system provided by the present invention includes a test pump 3, a drive component, a flow regulating component, a loading pressure regulating component and a flow measuring component.

[0022] One end of the test pump 3 is connected to the oil tank 1 , and the test pump 3 is cooperatively connected to the driving component, and the test pump 3 is driven by the driving component.

[0023] In some embodiments, the driving component is an electric motor 2 , and the electric motor 2 is driven to connect to the test pump 3 to provide driving force for the test pump 3 .

[0024] The flow output port (P) of the tested pump 3 is connected to the oil inlet port of the flow regulating component.

[0025] The load pressure feedback (LS) port of the test pump 3 is connected to the oil outlet of the flow regulating component.

[0026] The flow regulating component is used to set the opening size of the outlet throttle of the test pump 3.

[0027] The flow regulating assembly includes a first two-way cartridge valve assembly and a second two-way cartridge valve assembly.

[0028] The first two-way cartridge valve assembly comprises a first two-way cartridge valve core 51 and a first two-way cartridge valve cover plate 52 . The opening of the first two-way cartridge valve core 51 can be set by adjusting the adjusting screw of the first two-way cartridge valve cover plate 52 .

[0029] The second two-way cartridge valve assembly includes a second two-way cartridge valve core 53 and a second two-way cartridge valve cover plate 54 . The opening of the second two-way cartridge valve core 53 can be set by adjusting the adjusting screw of the second two-way cartridge valve cover plate 54 .

[0030] At the same time, the first two-way cartridge valve assembly and the second two-way cartridge valve assembly are equipped with a first reversing valve 6, and the opening and closing of the first two-way cartridge valve assembly and the second two-way cartridge valve assembly are controlled by resetting / energizing the first reversing valve 6.

[0031] The first reversing valve 6 in this scheme is a two-position reversing valve. For example, when the first reversing valve 6 loses power, the first two-way cartridge valve assembly is opened, the second two-way cartridge valve assembly is closed, and the outlet throttle of the test pump is set by the first two-way cartridge valve assembly; when the first reversing valve 6 is energized, the first two-way cartridge valve assembly is closed, the second two-way cartridge valve assembly is opened, and the outlet throttle of the test pump is set by the second two-way cartridge valve assembly;

[0032] The first reversing valve 6 is energized or de-energized to switch the opening size of the outlet throttle of the tested pump, and to test whether the output flow of the tested pump 3 can respond to the change of the size of the pump outlet throttle in time.

[0033] The flow regulating component is also equipped with a first pressure sensor 41, which is arranged at the inlet of the flow regulating component and is used to detect the inlet pressure of the flow regulating component, that is, the outlet pressure of the load sensitive variable pump under test.

[0034] The loading pressure regulating component is used to switch the size of the loading pressure on the tested pump 3 to test the stability of the output flow of the tested pump 3 when the loading pressure changes.

[0035] The loading pressure regulating assembly includes a third two-way cartridge valve assembly, a second reversing valve 10 , a first overflow valve 8 , and a second overflow valve 9 .

[0036] The third two-way cartridge valve assembly is a pressure control valve group, which is used to adjust the loading pressure of the outlet of the test pump. It includes a third two-way cartridge valve core 55 and a third two-way cartridge valve cover plate 56. The third two-way cartridge valve cover plate 56 is provided with an overflow valve, which is used as a safety valve to prevent excessive pressure.

[0037] The first relief valve is a proportional relief valve 8, which is used to pre-set a higher loading pressure; the second relief valve 9 is a stacking valve, which has two channels inside, one connected to the return oil and the other connected to the relief valve, which can realize no-load and low-pressure loading respectively.

[0038] The first relief valve 8 and the second relief valve 9 cooperate with the second reversing valve 10 to realize the switching among high-pressure loading, no-load and low-pressure loading.

[0039] Specifically, the second reversing valve 10 has three working states: power off, left electromagnet energized, and right electromagnet energized. The three working states can correspond to the high pressure loading set by the first relief valve 8, the no-load and low pressure set by the second relief valve 9. By controlling the state of the second reversing valve 10, different loading pressure switching can be achieved.

[0040] The loading pressure regulating assembly is also equipped with a second pressure sensor 42, which is arranged at the inlet of the pressure regulating assembly and is used to detect the inlet pressure of the pressure regulating assembly, that is, the pressure of the load pressure feedback (LS) port of the load sensitive variable pump.

[0041] The flow measurement component includes a throttle valve 7 and a third pressure sensor 43 .

[0042] When the opening size of the throttle valve 7 is constant, the inlet pressure thereof is different when different flow rates pass through it. The change of the inlet pressure of the throttle valve 7 is detected by the third pressure sensor 43, and the change of the flow rate passing through the throttle valve 7 is indirectly determined.

[0043] Based on the load-sensitive variable pump dynamic performance test system constructed by the above scheme, the following example illustrates its working process in specific applications. It should be noted that the working process described here is only an example and does not limit this scheme. The specific working process is as follows:

[0044] "Throttle switching-output flow response" test: By switching two-way cartridge valves with different openings, test whether the output flow of the test pump can respond in time when the size of the test pump outlet throttle changes rapidly.

[0045] (1) Start the motor 2, which drives the test pump 3;

[0046] (2) When the first reversing valve 6 loses power, the first two-way cartridge valve core 51 is opened, the second two-way cartridge valve core 53 is closed, and the outlet throttle of the test pump is set by the first two-way cartridge valve core 51;

[0047] (3) adjusting the adjusting screw of the first two-way cartridge valve cover plate 52 to set the opening of the first two-way cartridge valve core 51;

[0048] (4) When the first reversing valve 6 is energized, the first two-way cartridge valve core 51 is closed, the second two-way cartridge valve core 53 is opened, and the outlet throttle of the test pump is set by the second two-way cartridge valve core 53;

[0049] (5) adjusting the adjusting screw of the second two-way cartridge valve cover plate 54 to set the opening of the second two-way cartridge valve core 53;

[0050] (6) The outlet throttle of the test pump is switched by energizing or de-energizing the first reversing valve 6;

[0051] (7) Recording the pressure of the third pressure sensor 43 to determine the flow change through the throttle valve 7;

[0052] “Loading pressure switching-output flow stability” test: by switching the relief valves with different set pressures, the stability of the output flow of the test pump 3 is tested when the loading pressure changes rapidly.

[0053] (1) Start the motor 2, which drives the test pump 3;

[0054] (2) adjusting the opening of the first two-way cartridge valve core 51 and the opening of the second two-way cartridge valve core 53 to set the output flow of the test pump 3;

[0055] (3) The first relief valve 8 is pre-adjusted to set a higher pressure to achieve high-pressure loading, and the second relief valve 9 is connected to the return oil and the relief valve to achieve no-load and low-pressure loading respectively;

[0056] (4) Switching the second reversing valve 10, and controlling the switching of the three pressures in step 3 through the three working states of the second reversing valve being de-energized, the left electromagnet being energized, and the right electromagnet being energized, so that the output pressure of the test pump 3 is switched between high pressure, low pressure, and no-load;

[0057] (5) Record the pressure of the third pressure sensor 43 and determine the flow rate through the throttle valve 7.

[0058] The load-sensitive variable pump dynamic performance test system formed by the above scheme performs a "throttle switching-output flow response" test on the load-sensitive variable pump by step switching the opening size of the outlet throttle of the test load-sensitive variable pump; and performs a "loading pressure switching-output flow stability" test on the load-sensitive variable pump by step switching the loading pressure size, thereby testing the dynamic performance of the load-sensitive variable pump.

[0059] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A load-sensitive variable displacement pump dynamic performance test system, comprising a test pump and a drive assembly for driving the test pump, characterized in that: It also includes a flow regulating component, a loading pressure regulating component and a flow measuring component; the output of the test pump is connected to the flow regulating component, and the rapid switching of the throttle opening size of the test pump is used to test whether the output flow size of the test pump can respond in time when the throttle size changes rapidly; the loading pressure regulating component is connected to the outlet of the flow regulating component, and the loading pressure of the test pump is adjusted by the loading pressure regulating component to test the stability of the output flow of the test pump when the loading pressure changes; the flow measuring component is arranged at the outlet of the pressure regulating component, and is used to detect the change of the output flow of the hydraulic pump in real time.

2. A load-sensitive variable displacement pump dynamic performance test system according to claim 1, characterized in that: The flow regulating component includes a first two-way cartridge valve component, a second two-way cartridge valve component, and a first reversing valve. The first reversing valve controls the opening or closing of the first two-way cartridge valve component and the second two-way cartridge valve component to achieve switching of throttling functions with different opening degrees.

3. A load-sensitive variable displacement pump dynamic performance test system according to claim 2, characterized in that: The first two-way cartridge valve assembly comprises a first two-way cartridge valve core and a first two-way cartridge valve cover plate. The adjusting screw provided on the first two-way cartridge valve cover plate can adjust the opening of the first two-way cartridge valve core.

4. A load-sensitive variable displacement pump dynamic performance test system according to claim 2, characterized in that: The second two-way cartridge valve assembly comprises a second two-way cartridge valve core and a second two-way cartridge valve cover plate. The adjusting screw provided on the second two-way cartridge valve cover plate can adjust the opening of the second two-way cartridge valve core.

5. A load-sensitive variable displacement pump dynamic performance test system according to claim 2, characterized in that: The flow regulating component is equipped with a first pressure sensor, which is arranged at the inlet of the flow regulating component and is used to detect the inlet pressure of the flow regulating component, that is, the outlet pressure of the load sensitive variable pump under test.

6. A load-sensitive variable displacement pump dynamic performance test system according to claim 1, characterized in that: The loading pressure regulating component includes a third two-way cartridge valve component, a second reversing valve, a first overflow valve, and a second overflow valve. The first overflow valve and the second overflow valve are respectively set with different loading pressures, and cooperate with the second reversing valve to switch the connection between the first overflow valve or the second overflow valve to switch the loading of different pressures.

7. A load-sensitive variable displacement pump dynamic performance test system according to claim 6, characterized in that: The third two-way cartridge valve assembly comprises a third two-way cartridge valve core and a third two-way cartridge valve cover plate. The third two-way cartridge valve cover plate is provided with an overflow valve for use as a safety valve.

8. A load-sensitive variable displacement pump dynamic performance test system according to claim 6, characterized in that: The first relief valve is used to set high-pressure loading, and the second relief valve is used for low-pressure loading. By controlling the change of the action of the second reversing valve, the corresponding high-pressure loading set by the first relief valve, the low-pressure loading set by the second relief valve, and no-load are switched respectively to achieve different loading pressure switching.

9. A load-sensitive variable displacement pump dynamic performance test system according to claim 6, characterized in that: The loading pressure regulating assembly is equipped with a second pressure sensor, which is arranged at the inlet of the pressure regulating assembly and is used to detect the inlet pressure of the pressure regulating assembly, that is, the pressure at the load pressure feedback port of the load sensitive variable pump.

10. A load-sensitive variable displacement pump dynamic performance test system according to claim 1, characterized in that: The flow detection component includes a third pressure sensor and a throttle valve. The third pressure sensor is used to detect changes in the inlet pressure of the throttle valve, thereby indirectly measuring changes in the output flow of the pump.

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