Pump performance test system

Abstract

The present application relates to the technical field of hydraulic systems, and provides a pump performance test system. The pump performance test system includes an oil inlet circuit and an oil outlet circuit; the oil inlet circuit includes at least two parallel branches, at least one branch is connected to one of the oil ports, at least another branch is connected to the other oil port, and at least two branches can be opened one by one so that the corresponding oil port is used for oil inlet; the at least two oil ports are used for oil inlet as the oil inlet, and the oil outlet as the oil outlet; the oil outlet circuit is provided with a main outlet, a first auxiliary outlet, and a second auxiliary outlet, the oil inlet end of the main outlet is connected to the oil outlet of the pump to be tested, the first auxiliary outlet and the second auxiliary outlet are connected in parallel to the main outlet, and can be connected to the main outlet one by one, the oil outlet end of the first auxiliary outlet is connected to the oil inlet of the pump to be tested, and the oil outlet end of the second auxiliary outlet is connected to the oil supply terminal. The pump performance test system provided by the present application integrates the open test and closed test of the hydraulic pump, which is conducive to the forward and reverse test adjustment and simplifies the operation process.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic systems, and in particular to a pump performance testing system. Background Art

[0002] Hydraulic pumps are widely used in automobile suspension, construction machinery actuation mechanisms, robot motion mechanisms, etc. They mainly provide actuation force and reduce speed impact, thereby improving equipment service life and operating comfort.

[0003] Hydraulic pumps need to undergo performance tests before leaving the factory. The performance tests of hydraulic pumps usually include open-loop tests and closed-loop tests to meet the performance tests of hydraulic pumps under different working pressures. However, traditional hydraulic pump tests are mostly for unidirectional pumps, which is not conducive to open-loop tests and closed-loop tests under forward and reverse rotation of the pump, and the operation is very cumbersome. Summary of the invention

[0004] Based on this, it is necessary to provide a pump performance testing system that integrates open and closed tests of hydraulic pumps, which is particularly conducive to forward and reverse test adjustments and simplifies the operating process.

[0005] A pump performance testing system is used to test a pump to be tested having at least two oil ports and includes an oil inlet circuit and an oil outlet circuit; the oil inlet circuit includes at least two branches connected in parallel, at least one of the branches is used to connect one of the oil ports, and at least another branch is used to connect the other oil port, and at least two of the branches can be selectively opened so that the corresponding oil port is used for oil inlet; wherein, among the at least two oil ports, the one used for oil inlet is the oil inlet, and the one used for oil outlet is the oil outlet; the oil outlet circuit is provided with a main outlet, a first auxiliary outlet and a second auxiliary outlet, the oil inlet end of the main outlet is used to connect the oil outlet of the pump to be tested, the first auxiliary outlet and the second auxiliary outlet are connected in parallel to the main outlet, and can selectively be connected to the main outlet, the oil outlet end of the first auxiliary outlet is used to connect the oil inlet of the pump to be tested, and the oil outlet end of the second auxiliary outlet is used to connect the oil supply terminal.

[0006] It can be understood that the oil inlet circuit is used to supply oil to the pump to be tested, and the oil flowing through the pump to be tested flows along the oil outlet circuit. In this process, due to the parallel setting of at least two branches, oil can be selectively input to the pump to be tested, so that the flow direction of the oil flowing through the pump to be tested can be adjusted. Such a setting can not only be used for the test of unidirectional pumps, but also can match the test of bidirectional pumps, with a wider range of applications and more flexible operation. At the same time, the oil passing through the pump to be tested can flow to the main outlet, and flow to the first auxiliary outlet or the second auxiliary outlet through the main outlet. When flowing to the first auxiliary outlet, it is equivalent to flowing to the oil inlet of the pump to be tested, as a closed test of the pump to be tested; when flowing to the second auxiliary outlet, it is equivalent to flowing to the oil supply terminal, as an open test of the pump to be tested. Therefore, the pump performance testing system provided in the present application can not only meet the open and closed tests of unidirectional pumps, but also meet the open and closed tests of bidirectional pumps; in particular, when conducting bidirectional pump testing, there is no need to disassemble and reinstall the pump to be tested. The forward and reverse performance of the pump to be tested can be directly used to achieve open and closed tests under forward and reverse conditions, and the operation is simpler.

[0007] In some embodiments, the oil outlet circuit includes a third branch and a fourth branch, the third branch is connected to one of the branches and has a first access point, the fourth branch is connected to another of the branches and has a second access point, the first access point is used to connect to one of the oil ports, and the second access point is used to connect to the other of the oil ports;

[0008] The oil outlet circuit also includes a pressure regulating circuit, and the pressure regulating circuit is connected between the third branch and the fourth branch; the pump performance test system has an open state and a closed state;

[0009] In the open state, the third branch and the fourth branch can selectively connect to the pressure regulating circuit and jointly define the main outlet, and the oil outlet end of the pressure regulating circuit is connected to the second auxiliary outlet; in the closed state, the third branch and the fourth branch are connected through the pressure regulating circuit, one of them and a part of the pressure regulating circuit jointly define the main outlet, and the other and another part of the pressure regulating circuit jointly define the first auxiliary outlet.

[0010] In some embodiments, the pressure regulating circuit includes a first circuit, a second circuit and a third circuit, and the three are connected in parallel in pairs; the first circuit is connected to the third branch and has a first connection point, the third circuit is connected to the fourth branch and has a second connection point, the first circuit is respectively provided with a first one-way valve on both sides of the first connection point, and the third circuit is respectively provided with a second one-way valve on both sides of the second connection point; the flow direction of each of the first one-way valves is the same as the flow direction of each of the second one-way valves.

[0011] In some embodiments, in the open state, the third branch, part of the first path and the second path together define the main outlet, or the fourth branch, part of the third path and the second path together define the main outlet;

[0012] In the closed state, the third branch, part of the first road and the second road jointly define the main outlet, and the fourth branch and part of the third road jointly define the first auxiliary outlet; or, the fourth branch, part of the third road and the second road jointly define the main outlet, and the third branch and part of the first road jointly define the first auxiliary outlet.

[0013] In some embodiments, the main outlet includes a reversing valve, which has a liquid inlet and at least two liquid outlets, the oil inlet end of the first auxiliary outlet and the oil inlet end of the second auxiliary outlet are respectively connected to one of the liquid outlets, and at least two of the liquid outlets can selectively connect to the liquid inlet.

[0014] In some embodiments, the oil inlet circuit further includes a first pressure regulating component, which is connected to a parallel point of at least two of the branches and is used to adjust the inlet pressure of the pump to be tested;

[0015] The main outlet further comprises a second pressure regulating component, which is connected in series with the reversing valve and arranged upstream of the liquid inlet, and is used to adjust the outlet pressure of the pump to be tested.

[0016] In some embodiments, the first pressure regulating component includes an oil replenishment pump and a first overflow path, the inlet of the oil replenishment pump is used to connect to the oil supply terminal, the outlet of the oil replenishment pump is connected to at least two of the branches, the first overflow path is connected to the outlet of the oil replenishment pump, and the first overflow path is connected in series with each of the branches; and / or, the second pressure regulating component adopts a hydraulic motor, and the outlet pressure is configured to be adjusted in response to a torque change of the hydraulic motor.

[0017] In some embodiments, the oil inlet circuit has an oil inlet end, each of the branches is provided with a third one-way valve, and each of the third one-way valves is used to guide the oil to flow from the oil inlet end to the pump to be tested; and / or, the oil inlet circuit and the oil outlet circuit have a first access point and a second access point, the pump to be tested is connected between the first access point and the second access point, and an overflow oil circuit is connected to the first access point and / or the second access point.

[0018] In some of the embodiments, at least one of a pressure sensor, a flow meter, and a temperature sensor is provided on the oil inlet circuit and / or the oil outlet circuit.

[0019] In some embodiments, the pump performance testing system further includes an oil tank, and the oil inlet end of the oil inlet circuit and the oil outlet end of the second auxiliary outlet are respectively connected to the oil tank.

[0020] In some embodiments, the oil tank is provided with a liquid level sensor and / or a temperature sensor, or the oil tank is provided with a liquid level and temperature meter; and / or the pump performance testing system further includes a radiator, which is connected to the oil tank for dissipating heat from the oil tank.

[0021] In some embodiments, the pump to be tested is a bidirectional hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of a pump performance testing system provided in one embodiment of the present application;

[0024] Figure 2 Another schematic diagram of a pump performance testing system provided by an embodiment of the present application;

[0025] Figure 3 The pump performance test system provided in one embodiment of the present application is intended to be tested in a forward rotation open mode;

[0026] Figure 4 The pump performance test system provided in one embodiment of the present application is intended for a forward rotation closed test;

[0027] Figure 5 The pump performance test system provided in one embodiment of the present application is intended to be tested in a reverse open state;

[0028] Figure 6 The pump performance test system provided in one embodiment of the present application is intended for reverse closed testing;

[0029] Figure 7 A control block diagram of a pump performance testing system provided in one embodiment of the present application.

[0030] Figure numerals: 10, oil inlet circuit; 11, branch circuit; 12, first pressure regulating component; 20, oil outlet circuit; 21, third branch circuit; 22, fourth branch circuit; 23, pressure regulating circuit; 24, reversing valve; 25, second pressure regulating component; 30, pump to be tested; 31, first oil port; 32, second oil port; 33, stop valve; 40, overflow circuit; 41, second overflow valve; 51, pressure sensor; 52, flow meter; 53, temperature sensor; 54, liquid level and temperature gauge; 60, oil tank; 70, radiator; 81, industrial computer; 82, first power supply device; 83, second power supply device; 84, signal collector; 85, power meter; 11 1. First branch; 112. Second branch; 113. Third one-way valve; 121. Make-up oil pump; 122. First overflow path; 201. Main outlet; 202. First auxiliary outlet; 203. Second auxiliary outlet; 231. First path; 232. Second path; 233. Third path; 234. First one-way valve; 235. Second one-way valve; 301. First access point; 302. Second access point; 241. Liquid inlet; 242. Liquid outlet; 242a. First liquid outlet; 242b. Second liquid outlet; 1101. Parallel point; 1221. First overflow valve; 2011. First connection point; 2012. Second connection point. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0036] See also Figure 1 and Figure 2 An embodiment of the present application provides a pump performance test system for testing a pump 30 to be tested, wherein the pump 30 to be tested has at least two oil ports. The pump performance test system includes an oil inlet circuit 10 and an oil outlet circuit 20, wherein the oil inlet circuit 10 is used to provide oil to the pump 30 to be tested, and the oil flowing through the pump 30 to be tested flows to the oil outlet circuit 20.

[0037] See also Figures 1 to 6 Specifically, the oil inlet circuit 10 includes at least two parallel branches 11, at least one branch 11 is used to connect one of the oil ports, at least another branch 11 is used to connect the other oil port, and at least two branches 11 can be opened one by one so that the corresponding oil port is used for oil inlet. Among them, the at least two oil ports are used for oil inlet and the one used for oil outlet. At the same time, the oil outlet circuit 20 is provided with a main outlet 201, a first auxiliary outlet 202 and a second auxiliary outlet 203. The oil inlet end of the main outlet 201 is used to connect the oil outlet of the pump to be tested 30. The first auxiliary outlet 202 and the second auxiliary outlet 203 are connected in parallel to the main outlet 201, and can be connected to the main outlet 201 one by one. The oil outlet end of the first auxiliary outlet 202 is used to connect the oil inlet of the pump to be tested 30, and the oil outlet end of the second auxiliary outlet 203 is used to connect the oil supply terminal.

[0038] For ease of description, at least two branches 11 can be divided into a first branch 111 and a second branch 112, and at least two oil ports can be divided into a first oil port 31 and a second oil port 32. The first branch 111 is connected to the first oil port 31, and the second branch 112 is connected to the second oil port 32. In actual use, the oil inlet circuit 10 has an oil inlet end, which is located upstream of the first branch 111 and the second branch 112 along the oil inlet direction, and the oil inlet end is connected to the oil supply terminal to meet the oil supply of the pump 30 to be tested.

[0039] When oil is provided to the pump 30 to be tested, the first branch 111 and the second branch 112 can selectively input oil to the pump 30 to be tested. For example, when oil flows to the pump 30 to be tested via the first branch 111, the first oil port 31 connected to the first branch 111 serves as the oil inlet of the pump 30 to be tested, and the second oil port 32 serves as the oil outlet of the pump 30 to be tested; conversely, when oil flows to the pump 30 to be tested via the second branch 112, the second oil port 32 connected to the second branch 112 serves as the oil inlet of the pump 30 to be tested, and the first oil port 31 serves as the oil outlet of the pump 30 to be tested. In other words, the first branch 111 and the second branch 112 can be adjusted to selectively input oil to the pump 30 to be tested, so that the flow direction of the oil flowing through the pump 30 to be tested satisfies the adjustment. Such a setting can not only be used for testing unidirectional pumps, but also can match the forward and reverse tests of bidirectional pumps. In the forward and reverse tests of the bidirectional pumps, there is no need to disassemble and reinstall the pump 30 to be tested. The forward and reverse characteristics of the pump 30 to be tested can be directly used to implement the test, which makes the operation simpler.

[0040] At the same time, since the oil flowing through the pump 30 to be tested can flow to the main outlet 201, and then flow to the first auxiliary outlet 202 or the second auxiliary outlet 203 through the main outlet 201, when flowing to the first auxiliary outlet 202, it flows along the first auxiliary outlet 202 to the oil inlet of the pump 30 to be tested, and the closed test of the pump 30 to be tested is realized. When flowing to the second auxiliary outlet 203, it flows along the second auxiliary outlet 203 to the oil supply terminal (such as the oil tank 60), and the open test of the pump 30 to be tested is realized.

[0041] In summary, it can be seen that the pump performance testing system provided in the present application can not only meet the open test and closed test of a unidirectional pump, but also meet the open test and closed test of a bidirectional pump; in particular, when conducting a bidirectional pump test, there is no need to disassemble and reinstall the pump 30 to be tested. The forward and reverse performance of the pump 30 to be tested can be directly used to achieve open and closed tests under forward and reverse conditions, and the operation is simpler.

[0042] like Figure 1 and Figure 2As shown, in an optional embodiment, a third one-way valve 113 is provided on each of the first branch 111 and the second branch 112, and each third one-way valve 113 is used to guide the oil to flow from the oil inlet end to the pump 30 to be tested. In other words, when the oil flows to the pump 30 to be tested along one of the branches 11, the third one-way valve 113 on the remaining branches 11 can prevent the oil from flowing back to the oil inlet end. Among them, stop valves 33 are respectively provided at the first oil port 31 and the second oil port 32 of the pump 30 to be tested to adjust the connection state between the pump 30 to be tested and the oil inlet circuit 10 and the oil outlet circuit 20. For example, if the stop valve 33 is opened, it is connected; otherwise, if the stop valve 33 is closed, it is disconnected. When it is necessary to replace a different pump 30 to be tested, both stop valves 33 can be closed to avoid oil leakage.

[0043] Please continue reading Figures 1 to 6 In some embodiments, the oil outlet circuit 20 includes a third branch 21, which is connected to one of the branches 11 (for example, the first branch 111), and a first access point 301 is provided between the two. The oil outlet circuit 20 also includes a fourth branch 22, which is connected to another branch 11 (for example, the second branch 112), and a second access point 302 is provided between the two. The first access point 301 is used to connect to the first oil port 31, and the second access point 302 is used to connect to the second oil port 32. In this way, the first oil port 31 and the second oil port 32 of the pump 30 to be tested can be selected as the oil outlet and connected to the oil outlet circuit 20.

[0044] For example, the first branch 111 may be used to inlet oil to the first oil port 31, then the first oil port 31 is used as the oil inlet, the second oil port 32 is used as the oil outlet and is connected to the fourth branch 22, and the oil flows along the first branch 111, the first oil port 31, the second oil port 32 to the fourth branch 22. Of course, considering the forward and reverse rotation of the pump 30 to be tested, the second branch 112 may be used to inlet oil, and the oil flows along the second branch 112, the second oil port 32, the first oil port 31 to the third branch 21.

[0045] It should be noted that the first access point 301 and the second access point 302 can also serve as connection points between the first branch 111 and the second branch 112 of the oil inlet circuit 10 and the third branch 21 and the fourth branch 22 of the oil outlet circuit 20, respectively. The first oil port 31 and the second oil port 32 of the pump 30 to be tested are respectively connected to the first access point 301 and the second access point 302, thereby realizing the connection of the pump 30 to be tested relative to the pump performance test system.

[0046] Furthermore, the oil outlet circuit 20 further includes a pressure regulating circuit 23, which is connected between the third branch 21 and the fourth branch 22. The pressure regulating circuit 23 can also be used to adjust the oil pressure at the outlet of the pump 30 to be tested. The specific pressure regulating method will be described in detail later. Here, the relationship between the third branch 21, the fourth branch 22 and the pressure regulating circuit 23 and the aforementioned main outlet 201, the first auxiliary outlet 202 and the second auxiliary outlet 203 is described first.

[0047] See also Figures 2 to 6 The pump performance test system has an open state and a closed state. In the open state, the third branch 21 and the fourth branch 22 can be connected to the pressure regulating circuit 23 at one and the other, and define the main outlet 201 together, and the oil outlet end of the pressure regulating circuit 23 is connected to the second auxiliary outlet 203. In the closed state, the third branch 21 and the fourth branch 22 are connected through the pressure regulating circuit 23, one of which defines the main outlet 201 together with a part of the pressure regulating circuit 23, and the other defines the first auxiliary outlet 202 together with another part of the pressure regulating circuit 23.

[0048] That is to say, according to the oil inlet conditions of the first branch 111 and the second branch 112, one of the first oil port 31 and the second oil port 32 is used as the oil inlet and the other is used as the oil outlet, and the third branch 21 or the fourth branch 22 connected to the oil outlet is used for oil outlet.

[0049] See also Figure 5 and Figure 6 , taking the oil inlet of the first branch 111 as an example, the first oil port 31 is the oil inlet, and the second oil port 32 is the oil outlet. During the open test, the oil flows from the first branch 111 to the first oil port 31, and flows out of the pump 30 to be tested from the second oil port 32, and then flows along the fourth branch 22 to the pressure regulating circuit 23. At this time, the fourth branch 22 and the pressure regulating circuit 23 are connected and together form the main outlet 201; at the same time, the oil flowing through the pressure regulating circuit 23 flows to the second auxiliary outlet 203 to the oil supply terminal. During the closed test, the oil flowing through the pressure regulating circuit 23 flows to the third branch 21, and flows along the third branch 21 to the oil inlet of the pump 30 to be tested (here is the first oil port 31), and at this time the third branch 21 serves as the first auxiliary outlet 202.

[0050] See also Figure 3 and Figure 4, taking the oil inlet of the second branch 112 as an example, the second oil port 32 is the oil inlet, and the first oil port 31 is the oil outlet. During the open test, the oil flows from the second branch 112 to the second oil port 32, and flows out of the pump 30 to be tested from the first oil port 31, and then flows along the third branch 21 to the pressure regulating circuit 23. At this time, the third branch 21 and the pressure regulating circuit 23 are connected and together form the main outlet 201; at the same time, the oil flowing through the pressure regulating circuit 23 flows to the second auxiliary outlet 203 to the oil supply terminal. During the closed test, the oil flowing through the pressure regulating circuit 23 flows to the fourth branch 22, and flows along the fourth branch 22 to the oil inlet of the pump 30 to be tested (here is the second oil port 32). At this time, the fourth branch 22 serves as the first auxiliary outlet 202.

[0051] Among them, Figures 3 to 6 In the direction indicated by the middle arrow, the first oil port 31 is used as the oil inlet and the second oil port 32 is used as the oil outlet for the reverse rotation of the pump 30 to be tested, and the second oil port 32 is used as the oil inlet and the first oil port 31 is used as the oil outlet for the forward rotation of the pump 30 to be tested.

[0052] Please continue reading Figures 2 to 6 For example, the pressure regulating circuit 23 includes a first circuit 231, a second circuit 232 and a third circuit 233, and two of the three circuits are connected in parallel. For example, the first circuit 231 and the second circuit 232 may be connected in series, and the third circuit 233 may be connected in parallel with the second circuit 232; or, the second circuit 232 and the third circuit 233 may be connected in series, and the first circuit 231 may be connected in parallel with the second circuit 232; or, the first circuit 231 and the third circuit 233 may be connected in series, and the second circuit 232 may be connected in parallel between the first circuit 231 and the third circuit 233. This is just an example. Among them, the first road 231 is connected to the third branch 21 and has a first connection point 2011, the third road 233 is connected to the fourth branch 22 and has a second connection point 2012, the first road 231 is respectively provided with a first one-way valve 234 on both sides of the first connection point 2011, the third road 233 is respectively provided with a second one-way valve 235 on both sides of the second connection point 2012, and the flow direction of each first one-way valve 234 is the same as the flow direction of each second one-way valve 235.

[0053] like Figure 2 As shown, the flow direction of each first one-way valve 234 and each second one-way valve 235 is from right to left. Among them, each one-way valve (including the first one-way valve 234 and the second one-way valve 235) is a one-way valve with an elastic element, such as a spring-type one-way valve, which can be opened under the action of oil pressure.

[0054] In some specific embodiments, two first one-way valves 234 are provided on the first path 231, and are respectively provided on both sides of the first connection point 2011; and two first one-way valves 234 are provided on the third path 233, and are respectively provided on both sides of the second connection point 2012. By setting the one-way valves, the oil flow direction can be adjusted according to the test requirements.

[0055] In actual use, in the open state, the third branch 21, part of the first road 231 and the second road 232 jointly define the main outlet 201, which is the open test oil circuit situation under forward rotation. Alternatively, the fourth branch 22, part of the third road 233 and the second road 232 jointly define the main outlet 201, which is the open test oil circuit situation under reverse rotation. At the same time, in the closed state, the third branch 21, part of the first road 231 and the second road 232 jointly define the main outlet 201, and the fourth branch 22 and part of the third road 233 jointly define the first auxiliary outlet 202, which is the closed test oil circuit situation under forward rotation. Alternatively, the fourth branch 22, part of the third road 233 and the second road 232 jointly define the main outlet 201, and the third branch 21 and part of the first road 231 jointly define the first auxiliary outlet 202, which is the closed test oil circuit situation under reverse rotation.

[0056] Please continue reading Figures 2 to 6 Optionally, the main outlet 201 includes a reversing valve 24, which has a liquid inlet 241 and at least two liquid outlets 242 (respectively a first liquid outlet 242a and a second liquid outlet 242b), the oil inlet end of the first auxiliary outlet 202 is connected to the first liquid outlet 242a, the oil inlet end of the second auxiliary outlet 203 is connected to the second liquid outlet 242b, and the first liquid outlet 242a and the second liquid outlet 242b can selectively connect to the liquid inlet 241. In other words, the connection between the first auxiliary outlet 202 and the second auxiliary outlet 203 relative to the main outlet 201 can be adjusted by setting the reversing valve 24, so as to realize the switching between the open test and the closed test.

[0057] In some specific embodiments, the reversing valve 24 is disposed in the second path 232. At this time, the second liquid outlet 242b of the reversing valve 24 is connected to the second auxiliary outlet 203, and the first liquid outlet 242a is connected to the intersection of the first path 231 and the third path 233. In the open test, the liquid inlet 241 of the reversing valve 24 is connected to the second liquid outlet 242b; and, in the closed test, the liquid inlet 241 of the reversing valve 24 is connected to the first liquid outlet 242a.

[0058] In actual use, the pump performance test system further includes an oil tank 60, to which the oil inlet end of the oil inlet circuit 10 and the oil outlet end of the second auxiliary outlet 203 are respectively connected. The oil tank 60 is used to provide oil to the pump 30 to be tested and is used for open-type testing of the pump 30 to be tested.

[0059] See also Figures 3 to 6 The following is a detailed description of the open test oil circuit and the closed test oil circuit under forward and reverse rotation.

[0060] During the forward open test, the oil flows along the second branch 112 to the second oil port 32, and flows out from the first oil port 31 to the third branch 21, and flows to the first path 231 through the third branch 21; at this time, due to the setting of the two first one-way valves 234 on the first path 231, the first one-way valve 234 on the left is opened under the action of oil pressure, and the first one-way valve 234 on the right is closed, and the oil flows along the left part of the first path 231 to the second path 232, and then flows to the second auxiliary outlet 203 through the second liquid outlet 242b of the reversing valve 24.

[0061] During the forward closed test, the oil flows along the second branch 112 to the second oil port 32, and flows out from the first oil port 31 to the third branch 21, flows to the left part of the first path 231 through the third branch 21, flows along the second path 232 to the reversing valve 24, and flows out through the first liquid outlet 242a; at this time, the second one-way valve 235 on the third oil path 233 opens under the action of oil pressure, so that the oil flows along the third path 233 to the fourth branch 22, and then flows to the second oil port 32 of the pump 30 to be tested.

[0062] During the reverse open test, the oil flows along the first branch 111 to the first oil port 31, and flows out from the second oil port 32 to the fourth branch 22, and flows to the third path 233 through the fourth branch 22; at this time, due to the setting of the two second one-way valves 235 on the third path 233, the second one-way valve 235 on the left is opened under the action of oil pressure, and the second one-way valve 235 on the right is closed, and the oil flows along the left part of the third path 233 to the second path 232, and then flows to the second auxiliary outlet 203 through the second liquid outlet 242b of the reversing valve 24.

[0063] During the reverse closed test, the oil flows along the first branch 111 to the first oil port 31, and flows out from the second oil port 32 to the fourth branch 22, flows to the second path 232 through the left part of the third path 233, and then flows to the intersection of the first path 231 and the third path 233 through the first liquid outlet 242a of the reversing valve 24. The first check valve 234 on the first path 231 opens under the action of oil pressure, so that the oil flows along the first path 231 to the third branch 21, and then flows to the first oil path of the pump 30 to be tested.

[0064] Please continue reading Figures 1 to 6In an optional embodiment, the oil inlet circuit 10 further includes a first pressure regulating component 12, which is connected to the parallel point 1101 of at least two branches 11, for example, connected to the parallel point 1101 of the first branch 111 and the second branch 112, and is used to adjust the inlet pressure of the pump 30 to be tested. At the same time, the main outlet 201 of the oil outlet circuit 20 further includes a second pressure regulating component 25, which is connected in series with the reversing valve 24, that is, it is arranged on the second circuit 232 and is arranged upstream of the liquid inlet 241 of the reversing valve 24, and the second pressure regulating component 25 is used to adjust the outlet pressure of the pump 30 to be tested.

[0065] That is to say, by setting the first pressure regulating component 12 and the second pressure regulating component 25, the pressure at the oil inlet (i.e., inlet pressure) and the pressure at the oil outlet (i.e., outlet pressure) of the pump 30 to be tested can be adjusted to meet the performance test of the pump 30 to be tested under different pressure states.

[0066] Specifically, the first pressure regulating component 12 includes an oil replenishing pump 121 and a first overflow path 122. The inlet of the oil replenishing pump 121 is used to connect to the oil supply terminal (that is, the aforementioned oil tank 60), the outlet of the oil replenishing pump 121 is connected to the first branch 111 and the second branch 112, the first overflow path 122 is connected to the outlet of the oil replenishing pump 121, and the first overflow path 122 is connected in series with each branch 11. The oil outlet end of the first overflow path 122 can be connected to the oil tank 60.

[0067] On the one hand, the oil replenishing pump 121 is used to provide power to absorb the oil in the oil tank 60 to the pump to be tested 30, and during the test process of the pump to be tested 30, especially in the closed test, if the oil is insufficient, the oil replenishing pump 121 can be used to replenish the oil. On the other hand, the oil replenishing pump 121 can adjust the flow rate, and then adjust the oil pressure at the oil inlet of the pump to be tested 30, so as to cooperate with the second pressure regulating component 25 to achieve the performance test of the pump to be tested 30 under different pressures; and, in this process, due to the setting of the first overflow path 122, if the pressure at the oil inlet of the pump to be tested 30 is too high, part of the oil can flow to the oil tank 60 through the first overflow path 122 to reduce the oil pressure at the oil inlet.

[0068] The first overflow passage 122 is provided with a first overflow valve 1221 .

[0069] Furthermore, the second pressure regulating component 25 adopts a hydraulic motor, and the outlet pressure of the pump 30 to be tested is configured to be adjusted in response to the torque change of the hydraulic motor. The hydraulic motor is arranged in the second path 232 and is located upstream of the reversing valve 24. The oil flowing to the second path 232 via the first path 231 or the third path 233 flows to the reversing valve 24 after passing through the hydraulic motor, and is adjusted by the reversing valve 24 to flow to the second auxiliary outlet 203 or the first auxiliary outlet 202. The hydraulic motor can adjust the corresponding pressure by the rotation of its own main shaft. When the main shaft speed of the hydraulic motor increases, the corresponding torque increases and the pressure also increases; conversely, when the main shaft speed of the hydraulic motor decreases, the corresponding torque decreases and the pressure also decreases. Moreover, it is precisely because of the setting of the hydraulic motor that the linear adjustment of the test pressure of the pump 30 to be tested can be met.

[0070] In actual use, a flow meter 52 is also provided on the second path 232 for detecting the flow rate.

[0071] like Figure 2 As shown, in some embodiments, the pump performance test system further includes an overflow oil circuit 40, and the first access point 301 and the second access point 302 are both connected to the overflow oil circuit 40 to ensure the pressure stability of the first oil port 31 and the second oil port 32 of the pump 30 to be tested. Among them, each overflow oil circuit 40 is correspondingly provided with a second overflow valve 41.

[0072] Please continue reading Figures 1 to 6 In actual use, a pressure sensor 51 is provided at the first access point 301, and a pressure sensor 51 is also provided at the second access point 302, for detecting the pressure of the oil inlet and the oil outlet of the pump 30 to be tested. For example, a pressure sensor 51 can be connected upstream of the parallel point 1101 of the first branch 111 and the second branch 112, and a pressure sensor 51 is provided on both the third branch 21 and the fourth branch 22. At the same time, a temperature sensor 53 is provided on both the third branch 21 and the fourth branch 22 for detecting the oil temperature. In the open test and the closed test, the pressure sensor 51 and the temperature sensor 53 are both turned on to judge the overall performance through the detection of pressure and temperature.

[0073] Furthermore, a liquid level sensor and a temperature sensor are provided in the oil tank 60. The liquid level sensor is used to detect the liquid level in the oil tank 60, which is conducive to timely replenishing oil when the liquid level is low. The temperature sensor is used to detect the oil temperature in the oil tank 60, which can dissipate heat in time when the oil temperature is too high. Alternatively, a liquid level and temperature gauge 54 is provided in the oil tank to meet the requirements of liquid level and liquid temperature detection.

[0074] Furthermore, the pump performance test system further includes a radiator 70, which is connected to the oil tank 60 and is used to dissipate heat from the oil tank 60. The radiator 70 can be an air-cooled radiator or a liquid-cooled radiator.

[0075] In some embodiments, the pump 30 to be tested may be a bidirectional hydraulic pump to satisfy open and closed tests for forward and reverse rotations, and there is no need to disassemble or assemble the pump during forward and reverse rotation adjustments, making the operation simpler.

[0076] like Figure 7 As shown, in actual use, the pump to be tested 30 is also connected to the first power supply device 82, and the oil replenishment pump 121 and the hydraulic motor are all connected to the first power supply device 82. The signal collector 84 is connected to each of the aforementioned sensors to collect the detection information of each sensor, and then transmit it to the industrial computer 81 for analysis and processing. At the same time, the industrial computer 81 is connected to the power supply device, the pump to be tested 30, the oil replenishment pump 121, the hydraulic motor, etc. for control and signal transmission. At the same time, a power meter 85 can also be provided on the line supplying power to the pump to be tested 30 to detect the power size. The pump to be tested 30, the oil replenishment pump 121 and the hydraulic motor (that is, the second pressure regulating component 25) are all connected to a control board, and each control board is also connected to the second power supply device 83, and is connected to the industrial computer 81.

[0077] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A pump performance testing system, characterized in that: Used for testing a pump (30) to be tested having at least two oil ports, the pump performance testing system comprises: The oil inlet circuit (10) comprises at least two parallel branches (11), at least one of the branches (11) being used to connect to one of the oil ports, and at least another branch (11) being used to connect to another of the oil ports, and at least two of the branches (11) being capable of selectively being opened so that the corresponding oil port is used for oil inlet; wherein, of the at least two oil ports, the one used for oil inlet is the oil inlet, and the one used for oil outlet is the oil outlet; The oil outlet passage (20) is provided with a main outlet (201), a first auxiliary outlet (202) and a second auxiliary outlet (203); the oil inlet end of the main outlet (201) is used to connect to the oil outlet of the pump to be tested (30); the first auxiliary outlet (202) and the second auxiliary outlet (203) are connected in parallel to the main outlet (201) and can selectively connect to the main outlet (201); the oil outlet end of the first auxiliary outlet (202) is used to connect to the oil inlet of the pump to be tested (30); and the oil outlet end of the second auxiliary outlet (203) is used to connect to the oil supply terminal; The oil outlet circuit (20) further comprises a third branch (21) and a fourth branch (22), wherein the third branch (21) is connected to one of the branches (11) and has a first access point (301), and the fourth branch (22) is connected to another of the branches (11) and has a second access point (302), wherein the first access point (301) is used to connect to one of the oil ports, and the second access point (302) is used to connect to the other of the oil ports.

2. The pump performance testing system according to claim 1, characterized in that: The oil outlet circuit (20) further comprises a pressure regulating circuit (23), wherein the pressure regulating circuit (23) is connected between the third branch circuit (21) and the fourth branch circuit (22); the pump performance test system has an open state and a closed state; In the open state, the third branch (21) and the fourth branch (22) can selectively connect to the pressure regulating circuit (23) and jointly define the main outlet (201), and the oil outlet end of the pressure regulating circuit (23) connects to the second auxiliary outlet (203); in the closed state, the third branch (21) and the fourth branch (22) are connected via the pressure regulating circuit (23), one of them and a part of the pressure regulating circuit (23) jointly define the main outlet (201), and the other and another part of the pressure regulating circuit (23) jointly define the first auxiliary outlet (202).

3. The pump performance testing system according to claim 2, characterized in that: The pressure regulating circuit (23) comprises a first circuit (231), a second circuit (232) and a third circuit (233), and two of the three circuits are connected in parallel; The first path (231) is connected to the third branch (21) and has a first connection point (2011); the third path (233) is connected to the fourth branch (22) and has a second connection point (2012); the first path (231) is provided with first one-way valves (234) on both sides of the first connection point (2011); and the third path (233) is provided with second one-way valves (235) on both sides of the second connection point (2012); The flow direction of each of the first one-way valves (234) is the same as the flow direction of each of the second one-way valves (235).

4. The pump performance testing system according to claim 3, characterized in that: In the open state, the third branch (21), part of the first path (231) and the second path (232) together define the main outlet (201), or the fourth branch (22), part of the third path (233) and the second path (232) together define the main outlet (201); In the closed state, the third branch (21), part of the first path (231) and the second path (232) jointly define the main outlet (201), and the fourth branch (22) and part of the third path (233) jointly define the first auxiliary outlet (202); or, the fourth branch (22), part of the third path (233) and the second path (232) jointly define the main outlet (201), and the third branch (21) and part of the first path (231) jointly define the first auxiliary outlet (202).

5. The pump performance testing system according to claim 1, characterized in that: The main outlet (201) comprises a reversing valve (24), the reversing valve (24) having a liquid inlet (241) and at least two liquid outlets (242), the oil inlet end of the first auxiliary outlet (202) and the oil inlet end of the second auxiliary outlet (203) are respectively connected to one of the liquid outlets (242), and at least two of the liquid outlets (242) can selectively connect to the liquid inlet (241).

6. The pump performance testing system according to claim 5, characterized in that: The oil inlet circuit (10) further comprises a first pressure regulating component (12), the first pressure regulating component (12) being connected to a parallel connection point (1101) of at least two of the branches (11) and being used for adjusting the inlet pressure of the pump to be tested (30); The main outlet (201) further comprises a second pressure regulating component (25), which is connected in series with the reversing valve (24) and is arranged upstream of the liquid inlet (241) for adjusting the outlet pressure of the pump to be tested (30).

7. The pump performance testing system according to claim 6, characterized in that: The first pressure regulating component (12) comprises an oil replenishing pump (121) and a first overflow path (122), the inlet of the oil replenishing pump (121) being used to connect to an oil supply terminal, the outlet of the oil replenishing pump (121) being connected to at least two of the branch paths (11), the first overflow path (122) being connected to the outlet of the oil replenishing pump (121), and the first overflow path (122) being connected in series with each of the branch paths (11); and / or, The second pressure regulating component (25) adopts a hydraulic motor, and the outlet pressure is configured to be adjusted in response to a torque change of the hydraulic motor.

8. The pump performance testing system according to claim 1, characterized in that: The oil inlet circuit (10) has an oil inlet end, each branch circuit (11) is provided with a third one-way valve (113), and each third one-way valve (113) is used to guide oil to flow from the oil inlet end to the pump to be tested (30); and / or, The oil inlet circuit (10) and the oil outlet circuit (20) have a first access point (301) and a second access point (302); the pump to be tested (30) is connected between the first access point (301) and the second access point (302); and an overflow circuit (40) is connected to the first access point (301) and / or the second access point (302).

9. The pump performance testing system according to any one of claims 1 to 8, characterized in that: At least one of a pressure sensor (51), a flow meter, and a temperature sensor (53) on the oil inlet circuit (10) and / or the oil outlet circuit (20); and / or, The pump performance test system further comprises an oil tank (60), to which the oil inlet end of the oil inlet oil circuit (10) and the oil outlet end of the second auxiliary outlet (203) are respectively connected; the oil tank (60) is provided with a liquid level sensor and / or a temperature sensor (53), or the oil tank (60) is provided with a liquid level and temperature meter (54); The pump performance test system further comprises a radiator (70), wherein the radiator (70) is connected to the oil tank (60) and is used to dissipate heat from the oil tank (60).

10. The pump performance testing system according to any one of claims 1 to 8, characterized in that: The pump to be tested (30) is a bidirectional hydraulic pump.

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