CN116838598A - Test device and test method for load-sensitive variable pump - Google Patents
Test device and test method for load-sensitive variable pump Download PDFInfo
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- CN116838598A CN116838598A CN202311059753.5A CN202311059753A CN116838598A CN 116838598 A CN116838598 A CN 116838598A CN 202311059753 A CN202311059753 A CN 202311059753A CN 116838598 A CN116838598 A CN 116838598A
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- 238000012360 testing method Methods 0.000 title claims abstract description 87
- 238000010998 test method Methods 0.000 title claims abstract description 14
- 239000003921 oil Substances 0.000 claims abstract description 125
- 238000006073 displacement reaction Methods 0.000 claims abstract description 38
- 230000001105 regulatory effect Effects 0.000 claims abstract description 32
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 17
- 238000011144 upstream manufacturing Methods 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000011056 performance test Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The invention relates to a test device and a test method of a load-sensitive variable pump. The test device comprises an oil tank for supplying and recovering oil; a pump inlet port for connecting a pump inlet of the variable pump, and which guides a pump inlet oil passage that communicates with the oil tank; a pump outlet interface for connecting a pump outlet of the variable pump, and guiding a hydraulic oil way to be communicated with the oil tank through the flow regulating device and the pressure regulating device; a pump load feedback port interface for connecting a pump load feedback port of the variable pump; an external leakage port interface for connecting the external leakage port of the variable pump, which guides an external leakage oil path communicated with the oil tank, wherein a second flowmeter for measuring the flow at the external leakage port is arranged in the external leakage oil path; the reversing valve group is used for adjusting the test device, so that the variable pump is suitable for unloading loading state, full-displacement state and load sensitive variable state. The test device can connect the variable pump once, so that the performance test of the variable pump in three states can be simply and conveniently realized.
Description
Technical Field
The invention belongs to the technical field of hydraulic pump tests, and particularly relates to a test device and a test method for a load-sensitive variable pump.
Background
The load sensitive variable pump can simultaneously sense the pressure and flow requirements of the hydraulic system, respond correctly to the change of the flow pressure requirements, only provide the necessary flow for maintaining the system to work under the working pressure required by the load, and is widely applied to various hydraulic systems. The load sensitive pump is used as a power actuating mechanism of the hydraulic system, so that various performance indexes of the load sensitive pump are particularly important for judging the performance of the load sensitive pump.
However, the existing variable pump test standard in China only prescribes the test methods of constant pressure variables and constant power variables, and no prescribes the test methods of other variable functions. At present, the load sensitive variable pump test only generally tests the performance of the full displacement state of the load sensitive variable pump, and can not fully reflect the performance of the variable pump, thereby being unfavorable for the application of the load sensitive variable pump.
Disclosure of Invention
In view of the above, the present invention provides a testing device and a testing method for a load-sensitive variable pump, which can complete testing in three states of unloading, full displacement and variable of the variable pump by one connection of the variable pump and the testing device, so as to solve or at least alleviate one or more of the above-mentioned problems and other problems in the prior art.
To achieve the foregoing object, a first aspect of the present invention provides a test device for a load-sensitive variable pump, wherein the test device comprises:
the oil tank is used for supplying and recycling oil;
a pump inlet interface for connecting a pump inlet of the variable pump, and the pump inlet interface guides a pump inlet oil path communicated with the oil tank;
a pump outlet port for connecting to a pump outlet of the variable displacement pump, and which leads to a hydraulic oil circuit which communicates with the oil tank via a flow regulator and a pressure regulator, a first pressure gauge being provided in the hydraulic oil circuit for measuring the pressure at the pump outlet port and a first flow gauge for measuring the flow at the pump outlet port;
a pump load feedback port interface for connecting with a pump load feedback port of the variable pump, and a second pressure gauge for measuring the pressure thereof is arranged at the pump load feedback port interface;
an external leakage port interface, which is used for connecting an external leakage port of the variable pump, and guides an external leakage oil path communicated with the oil tank, wherein a second flowmeter for measuring the flow at the external leakage port interface is arranged in the external leakage oil path;
and the reversing valve group is used for adjusting the test device to be suitable for the performances of the variable pump in the unloading loading state, the full-displacement state and the load sensitive variable state respectively.
In the foregoing test apparatus, optionally, the test apparatus further includes a variable pump driving joint, the variable pump driving joint is connected to a driving motor of the variable pump, and a torque sensor and a rotation speed sensor are disposed between the driving motor and the variable pump.
In the test device as described previously, optionally:
the flow regulating device comprises a first two-way cartridge valve, a first two-way cartridge valve cover plate and a two-position four-way reversing valve positioned at a pilot control end of the first two-way cartridge valve, wherein the two-position four-way reversing valve is used for controlling the opening and closing of the first two-way cartridge valve, and a limit screw of the first two-way cartridge valve cover plate is used for controlling the opening of the first two-way cartridge valve;
the pressure regulating device comprises a second two-way cartridge valve and a second two-way cartridge valve cover plate, and a limit screw of the second two-way cartridge valve cover plate is used for controlling the opening of the second two-way cartridge valve;
the reversing valve group comprises a first two-position two-way normally-closed reversing valve, a second two-position two-way normally-closed reversing valve and a two-position two-way normally-open reversing valve, the first two-position two-way normally-closed reversing valve is connected with the upstream of the first two-way cartridge valve and the pump load feedback port interface, the second two-position two-way normally-closed reversing valve is connected with the upstream of the second two-way cartridge valve and the pump load feedback port interface, and the two-position two-way normally-open reversing valve is connected with the load feedback port interface and the oil tank.
In the foregoing test apparatus, optionally, an oil inlet of the two-position four-way reversing valve is connected to an upstream of the first two-way cartridge valve, and an oil return port of the two-position four-way reversing valve is connected to the oil tank.
In the test device, optionally, the connection oil path between the first two-position two-way normally-closed reversing valve and the pump load feedback port interface, the connection oil path between the second two-position two-way normally-closed reversing valve and the pump load feedback port interface, and the connection oil path between the two-position two-way normally-open reversing valve and the pump load feedback port interface are connected in pairs.
In the test apparatus as described above, optionally, the load feedback port is interfaced with a relief valve to the tank.
In order to achieve the foregoing object, a second aspect of the present invention provides a method of testing a load sensitive variable pump using the test apparatus as in any one of the first aspects, wherein a pump inlet of the variable pump is connected to the pump inlet port, a pump outlet of the variable pump is connected to the pump outlet port, a pump load feedback port of the variable pump is connected to the pump load feedback port, and an external leakage port of the variable pump is connected to the external leakage port.
In the method, optionally, when the unloading state test is performed, the reversing valve group is powered off, the flow regulating device is closed, the pump load feedback port interface is communicated with the oil tank, and the performance of the variable pump under different rotating speeds and different unloading pressures is tested.
In the method as described above, optionally, the reversing valve set includes a first two-position two-way normally-closed reversing valve, a second two-position two-way normally-closed reversing valve, and a two-position two-way normally-open reversing valve, and the first two-position two-way normally-closed reversing valve is connected to the upstream of the first two-way cartridge valve and the pump load feedback port interface, the second two-position two-way normally-closed reversing valve is connected to the upstream of the second two-way cartridge valve and the pump load feedback port interface, the two-position two-way normally-open reversing valve is connected to the load feedback port interface and the tank,
when the full displacement state test is carried out, the first two-position two-way normally-closed reversing valve and the two-position two-way normally-open reversing valve are powered on, the connection between the pump load feedback port interface and the oil tank is closed, the pump load feedback port interface is connected with the pump outlet interface through the first two-position two-way normally-closed reversing valve, and the output flow of the pump outlet interface passes through the flow regulating device and the pressure regulating device, and the variable pump is tested according to a quantitative pump test method.
In the method as described above, optionally, the reversing valve set includes a first two-position two-way normally-closed reversing valve, a second two-position two-way normally-closed reversing valve, and a two-position two-way normally-open reversing valve, and the first two-position two-way normally-closed reversing valve is connected to the upstream of the first two-way cartridge valve and the pump load feedback port interface, the second two-position two-way normally-closed reversing valve is connected to the upstream of the second two-way cartridge valve and the pump load feedback port interface, the two-position two-way normally-open reversing valve is connected to the load feedback port interface and the tank,
when a load sensitive variable state test is carried out, the second two-position two-way normally-closed reversing valve and the two-position two-way normally-open reversing valve are electrified, the connection between the pump load feedback port interface and the oil tank is closed, the pump load feedback port interface is connected with the inlet of the pressure regulating device through the second two-position two-way normally-closed reversing valve, and the output flow of the pump outlet interface passes through the flow regulating device and the pressure regulating device, and the output flow is regulated through the flow regulating device and the pressure is loaded through the flow controlling device.
According to the invention, through the oil way arrangement of the testing device of the load-sensitive variable pump, one-time connection of the variable pump and the testing device is realized, and the switching of the three states of unloading, full displacement and variable of the variable pump can be completed, so that the performance of the variable pump in the three states can be simply, conveniently and effectively measured.
Drawings
The present disclosure will become more apparent with reference to the accompanying drawings. It is to be understood that these drawings are solely for purposes of illustration and are not intended as a definition of the limits of the invention. In the figure:
FIG. 1 is a schematic diagram of one embodiment of a test apparatus for a load-sensitive variable pump of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a test apparatus for a load-sensitive variable pump of the present invention;
FIG. 3 is a schematic diagram of the installation test principle of the variable displacement pump of the test device embodiment of FIG. 2.
Reference numerals: 1-an oil tank; 2-a variable pump; 3-pump inlet interface; 4-pump outlet interface; 5-pump load feedback port interface; 6-an external leak port interface; 7-a pump drive joint; 8-driving a motor; 11-a first pressure gauge; 12-a second pressure gauge; 13-a first flowmeter; 14-a second flowmeter; 15-a torque sensor; 16-a rotation speed sensor; 20-a flow regulating device; 21-a first two-way cartridge valve; 22-a first two-way cartridge valve cover plate; 23-a second two-way cartridge valve; 24-a second two-way cartridge valve cover plate; 25-two-position four-way reversing valve; 26-a first two-position two-way normally closed reversing valve; 27-a second two-position two-way normally closed reversing valve; 28-two-position two-way normally open reversing valve; 29-an overflow valve; 30-pressure regulating means; s-pump inlet; p-pump outlet; l-leakage port; ls—pump load feedback port.
Detailed Description
The structure, composition, characteristics, advantages and the like of the test apparatus and the test method of the load-sensitive variable pump of the present invention will be described below by way of example with reference to the accompanying drawings and specific embodiments, however, all descriptions should not be construed as limiting the present invention in any way.
Furthermore, to the extent that any individual feature described or implied in the embodiments set forth herein, or any individual feature shown or implied in the figures, the invention still allows any combination or deletion of such features (or equivalents thereof) without any technical hurdle, and further embodiments according to the invention are considered to be within the scope of the disclosure herein.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
FIG. 1 is a schematic diagram of an embodiment of a test apparatus for a load-sensitive variable pump of the present invention.
As can be seen from the embodiment of fig. 1, the test device comprises a tank 1, which tank 1 is used for supplying and recovering oil. The test device further comprises a pump inlet port 3, a pump outlet port 4, a pump load feedback port 5, an external leakage port 6, a flow regulating device 20, a pressure regulating device 30 and a reversing valve set. The pump inlet port 3 is communicated with the oil tank 1 to form and guide a pump inlet oil path, the external leakage port 6 is communicated with the oil tank 1 to form and guide an external leakage oil path, and the pump outlet port 4 is sequentially connected with the flow regulating device 20, the pressure regulating device 30 and the oil tank 1 to form and guide a hydraulic oil path.
As can also be seen from fig. 1, the test device provides a first pressure gauge 11 in the hydraulic circuit at the pump outlet port 4 and a first flow gauge 13, the first pressure gauge 11 being used for measuring the oil pressure at the pump outlet port 4 and the first flow gauge 13 being used for measuring the oil flow at the pump outlet port 4; a second pressure gauge 12 is arranged at the pump load feedback interface 5 to measure the oil pressure at the pump load feedback interface 5; a second flowmeter 14 is provided in the outer leakage oil passage at the outer leakage port joint 6 to measure the oil flow rate at the outer leakage port joint 6. The product of the measured flow value and the pressure value is the output power of the variable displacement pump 2, and the pump displacement of the variable displacement pump 2 can be obtained by calculation from the measured flow value and the pressure value, thereby evaluating the performance of the measured variable displacement pump 2. And forming a database range according to the oil flow values of the leakage ports L measured by a large number of variable pumps 2 with the same model, and comparing to obtain whether the oil flow value at the leakage port interface 6 measured by the second flowmeter 14 is in a reasonable range or not so as to judge whether the measured variable pump 2 fails or not.
In an alternative embodiment, the flow regulating device 20 includes a first two-way cartridge valve 21, a second two-way cartridge valve cover plate 22, and a two-position four-way reversing valve 25. The oil inlet of the two-position four-way reversing valve 25 is connected to the upstream of the first two-way cartridge valve 21, and the pump outlet port 4 is communicated with the pilot control end of the first two-way cartridge valve 21, so that the pump outlet port 4 guides the hydraulic oil path to flow to the oil inlet end of the first two-way cartridge valve 21 and simultaneously flows to the pilot control end of the first two-way cartridge valve 21 through the two-position four-way reversing valve 25. At this time, the oil pressure received at the two ends of the valve core of the first two-way cartridge valve 21 is the same, and because the contact area between the pilot control end of the valve core and the oil is larger than the contact area between the oil inlet end of the valve core and the oil, the oil pressure received at the pilot control end of the valve core is larger than the oil pressure received at the oil inlet end, and the valve core cannot be opened, i.e. the first two-way cartridge valve 21 is closed, thereby closing the oil path of the pump outlet interface 4.
When the two-position four-way reversing valve 25 is powered on, the oil return port of the two-position four-way reversing valve 25 is connected with the oil tank 1, and the pilot control end of the first two-way cartridge valve 21 is communicated with the oil tank 1, so that the pressure born by the pilot control end of the first two-way cartridge valve 21 is the same as that of the oil tank 1. The pump outlet interface 4 guides the oil inlet end of the hydraulic oil path entering the first two-way cartridge valve 21, at this time, the pressure of the oil received by the valve core at the oil inlet end is greater than the pressure received by the pilot control end, and the oil at the oil inlet end can jack the valve core, so that the first two-way cartridge valve 21 is opened. The first two-way cartridge valve cover plate 22 is provided with a limit screw, and the limit screw can control the opening degree of the first two-way cartridge valve 21 so as to adjust the flow rate of a hydraulic oil way and simulate the load change of a hydraulic system, thereby testing the response performance of the measured variable pump 2.
According to the embodiment of fig. 1, the pressure regulating device 30 comprises a second two-way cartridge valve 23 and a second two-way cartridge valve cover plate 24, the pilot control end and the downstream end of the second two-way cartridge valve 23 being in communication with the fuel tank 1, and the upstream end of the second two-way cartridge valve 23 being in communication with the downstream of the first two-way cartridge valve 21, whereby the pump outlet port 4 directs the hydraulic oil flow through the first two-way cartridge valve 21 to the second two-way cartridge valve 23. The second two-way cartridge valve cover plate 24 has a limit screw that can control the opening of the second two-way cartridge valve 23 to adjust the pressure of the hydraulic oil path upstream thereof, simulate the load change of the hydraulic system, and thereby test the response performance of the measured variable pump 2.
The reversing valve group comprises a first two-position two-way normally-closed reversing valve 26, a second two-position two-way normally-closed reversing valve 27 and a two-position two-way normally-open reversing valve 28. The first two-position two-way normally-closed reversing valve 26 is connected with the upstream of the first two-way cartridge valve 21 and the pump load feedback port interface 5, and when the first two-position two-way normally-closed reversing valve 26 is powered on, the pump outlet interface 4 guides a hydraulic oil way to flow to the pump load feedback port interface 5 through the first two-position two-way normally-closed reversing valve 26, so that a full-displacement state test oil way of the variable pump 2 is formed. The second two-position two-way normally-closed reversing valve 27 is connected with the downstream of the first two-way cartridge valve 21 and the pump load feedback port interface 5, and when the second two-position two-way normally-closed reversing valve 27 is powered on, the pump outlet interface 4 guides a hydraulic oil path to flow to the second two-way cartridge valve 23 through the first two-way cartridge valve 21, and simultaneously flows to the pump load feedback port interface 5 through the second two-position two-way normally-closed reversing valve 27, so that a variable state test oil path of the variable pump 2 is formed. The two-position two-way normally-open reversing valve 28 is connected with the load feedback port interface 5 and the oil tank 1, and oil flowing out of the pump load feedback port interface 5 flows to the oil tank 1 through the two-position two-way normally-open reversing valve 28 to form an unloading state test oil way of the variable pump 2; when the two-position two-way normally-open reversing valve 28 is powered on, the connection between the pump load feedback port interface 5 and the oil tank 1 is closed.
It can also be seen from the embodiment of fig. 1 that the connection oil path between the first two-position two-way normally-closed reversing valve 26 and the pump load feedback port interface 5, the connection oil path between the second two-position two-way normally-closed reversing valve 27 and the pump load feedback port interface 5, and the connection oil path between the two-position two-way normally-open reversing valve 28 and the pump load feedback port interface 5 are connected in pairs, so that the structure of the test device is simple, and the unloading loading state, the full-displacement state and the load sensitive variable state can be switched by connecting the variable pump 2 to the test device once.
Optionally, as in the embodiment of fig. 1, the test device is provided with a relief valve 29, which relief valve 29 prevents the test device pressure from exceeding a permissible value during the test to ensure the safety of the test. The overflow valve 29 is connected with the first two-position two-way normally-closed reversing valve 26, the second two-position two-way normally-closed reversing valve 27, the load feedback port interface 5 and the oil tank 1, namely the connecting oil way shares the overflow valve 29, so that the test device has a simple structure, and the safety of the test process under three states of the variable pump 2 is effectively ensured.
It should be noted that the reversing valve set, the flow regulator 20, the pressure regulator 30, and the relief valve 29 may be electrically controlled or manually controlled, that is, the first two-way cartridge valve 21, the first two-way cartridge valve cover 22, the second two-way cartridge valve 23, the second two-way cartridge valve cover 24, the two-way four-way reversing valve 25, the first two-way normally-closed reversing valve 26, the second two-way normally-closed reversing valve 27, and the two-way normally-open reversing valve 28 may be electrically controlled or manually controlled, and may be operated as needed during the actual test.
FIG. 2 is a schematic diagram of another embodiment of a test apparatus for a load-sensitive variable pump according to the present invention.
Optionally, as in the embodiment of fig. 2, the test apparatus further includes a variable pump drive joint 7, and the variable pump drive joint 7 is connected to a drive motor 8 of the variable pump 2, and the drive motor 8 drives the variable pump 2 to pump oil from the oil tank 1.
As can also be seen from the embodiment of fig. 2, a torque sensor 15 and a rotational speed sensor 16 are arranged between the drive motor 8 and the variable displacement pump 2, respectively measuring the torque and the rotational speed of the drive motor 8, which rotational speed measurement enables a test of the various performance indicators of the variable displacement pump 2 at different rotational speeds, and the product of the measured torque and rotational speed is the input power of the variable displacement pump 2.
FIG. 3 is a schematic diagram of the installation test principle of the variable displacement pump of the test apparatus embodiment of FIG. 2. In comparison to fig. 1 and 2, a variable displacement pump 2 is shown in fig. 3.
The variable displacement pump 2 may be composed of a pump body and a variable displacement mechanism. The full displacement state is a function realized by the pump body, and the variable mechanism embodies the functional characteristics of the variable pump 2. The state of the variable displacement pump 2 can be divided into two types, i.e., unloading and working. Therefore, the invention divides the test state of the load-sensitive variable pump into three types, namely full displacement, unloading and load-sensitive variable. Specifically, the basic performance of the tested pump in the full displacement state can be tested according to the related standard requirements of the hydraulic pump; when the load sensitive pump is in an unloading state, the assembly level of the load sensitive pump can be estimated by testing the outlet pressure, leakage and input power of the load sensitive pump in the unloading state; and testing the variable performance in the load sensitive state when the load sensitive variable is in the state, including regulation performance, flow stability when the load is changed and the like.
As can be seen from fig. 3, the pump inlet S of the variable pump 2 is connected to the pump inlet port 3 to communicate with the pump inlet oil passage; the pump outlet P of the variable pump 2 is connected with the pump outlet interface 4 so as to be communicated with a hydraulic oil way; the pump load feedback port interface 5 of the variable pump 2 is connected with the pump load feedback port Ls so as to be communicated with an oil circuit; the leakage port L of the variable displacement pump 2 is connected to the leakage port 6 to communicate with the leakage oil passage. The following describes a test method of the performance of the variable displacement pump 2 in each state in combination with the diagram:
variable pump 2 unloading state test: the first two-way normally-closed reversing valve 26, the second two-way normally-closed reversing valve 27, the two-way normally-open reversing valve 28 and the two-way four-way reversing valve 25 are powered off, and the limiting screw of the first two-way cartridge valve cover plate 22 closes the opening of the first two-way cartridge valve 21.
At the beginning of the test, oil enters the variable pump 2 from the oil tank 1 through the pump inlet S and is divided into two paths of oil paths. One path is the hydraulic oil path from the pump outlet P to the oil inlet end of the first two-way cartridge valve 21 and through the two-position four-way reversing valve 25 to the pilot control end of the first two-way cartridge valve 21. At this time, the oil pressure received by the pilot control end of the spool of the first two-way cartridge valve 21 is greater than the oil pressure received by the oil inlet end, and the spool cannot be opened, so that the first two-way cartridge valve 21 is closed and the oil passage of the pump outlet P is closed. The other path of oil path flows from the pump load feedback port Ls to the oil tank 1 through the two-position two-way normally open reversing valve 28.
The values of the first pressure gauge 11, the second pressure gauge 12, the first flowmeter 13, the second flowmeter 14, the torque sensor 15 and the rotation speed sensor 16 at different unloading pressures and different rotation speeds are measured by adjusting the unloading pressure inside the variable pump 2 and the rotation speed of the driving motor 8. According to the measured values, the input power, output power, efficiency, pump displacement and pump flow of the variable pump 2 under different unloading pressures and different rotating speeds are calculated, so that the performance of the measured variable pump 2 under the unloading state is evaluated.
Specifically, since the pump outlet P is closed, the pressure value of the pump load feedback port Ls is approximately zero, and the output power of the pump load feedback port Ls is obtained by multiplying the pressure value by the flow value in the conventional variable pump unloading state test calculation method, the output power is very small and has a larger phase difference from the actual output power, because the conventional pump test calculation method ignores the loss inside the pump of the measured variable pump 2. Such as, but not limited to, frictional waste work between components within the pump, pressure losses due to hydraulic resistance of flow passages in components within the pump, and churning losses due to moving components within the oil within the pump. The test method of the present invention obtains the input power of the measured variable pump 2, the outlet pressure value of the pump load feedback port Ls measured by the second pressure gauge 12, and the flow value of the leakage port L measured by the second flow gauge 14 from the torque value measured by the torque sensor 15, the rotation speed sensor 16, etc., and calculates the actual output power of the outlet of the pump load feedback port Ls of the measured variable pump 2 and the loss inside the pump to obtain the assembly level of the measured variable pump 2, thereby evaluating the performance of the measured variable pump 2.
Meanwhile, it is determined whether the oil flow value at the leakage port L measured by the second flowmeter 14 is in a reasonable range, so that the measured variable displacement pump 2 fails.
Full displacement state test of variable pump 2: the two-position two-way normally-open reversing valve 28 is electrified to close the connection of the pump load feedback port Ls and the oil tank 1; the first two-position two-way normally-closed reversing valve 26 is electrified to communicate the hydraulic oil way of the pump outlet P with the pump load feedback port Ls; the two-position four-way selector valve 25 is energized to communicate the pilot control end of the first two-way cartridge valve 21 with the tank 1 to open the first two-way cartridge valve 21.
At the beginning of the test, oil enters the variable pump 2 from the oil tank 1 through the pump inlet S and is divided into two paths from the pump outlet P, one path of oil flows to the second two-way cartridge valve 23 through the first two-way cartridge valve 21, and the other path of oil flows to the pump load feedback port Ls through the first two-way normally-closed reversing valve 26.
According to the quantitative pump test method, the opening of the first two-way cartridge valve 21 is adjusted through the limit screw of the first two-way cartridge valve cover plate 22 to control the oil flow, and the opening of the second two-way cartridge valve 23 is adjusted through the limit screw of the second two-way cartridge valve cover plate 24 to control the oil pressure and simulate the load of a hydraulic system. Under a constant load, the values of the first pressure gauge 11, the second pressure gauge 12, the first flow gauge 13, the second flow gauge 14, the torque sensor 15, and the rotation speed sensor 16 are measured. Based on the measured values, the input power, output power, efficiency, pump displacement, and pump flow rate of the variable pump 2 under a constant load are calculated, thereby judging the performance of the measured variable pump 2. Meanwhile, it is determined whether the oil flow value at the leakage port L measured by the second flowmeter 14 is in a reasonable range, so that the measured variable displacement pump 2 fails.
Variable pump 2 variable state test: the two-position two-way normally-open reversing valve 28 is electrified to close the connection of the pump load feedback port Ls and the oil tank 1; the second two-position two-way normally-closed reversing valve 27 is electrified to communicate the hydraulic oil circuit downstream of the first two-way cartridge valve 21 with the pump load feedback port Ls; the two-position four-way selector valve 25 is energized to communicate the pilot control end of the first two-way cartridge valve 21 with the tank 1 to open the first two-way cartridge valve 21.
The test starts with oil entering the variable displacement pump 2 from the tank 1 through the pump inlet S and passing from the pump outlet P through the first two-way cartridge valve 21. Then the valve is divided into two paths, and one path flows to the second two-way cartridge valve 23; the other path flows to the pump load feedback port Ls through the second two-position two-way normally closed reversing valve 27.
The opening of the first two-way cartridge valve 21 is adjusted by the limit screw of the first two-way cartridge valve cover plate 22 to control the oil flow, and the opening of the second two-way cartridge valve 23 is adjusted by the limit screw of the second two-way cartridge valve cover plate 24 to control the oil pressure, so that the load change of the hydraulic system is simulated. The values of the first pressure gauge 11, the second pressure gauge 12, the first flowmeter 13, the second flowmeter 14, the torque sensor 15 and the rotation speed sensor 16 are measured, and various performance values of the variable pump 2 under different loads are obtained by calculating the input power, the output power, the efficiency, the pump displacement and the pump flow of the variable pump 2. Meanwhile, it is determined whether the oil flow value at the leakage port L measured by the second flowmeter 14 is in a reasonable range, so that the measured variable displacement pump 2 fails.
According to the test device of the load-sensitive variable pump, the oil way connection mode of the pump outlet P and the pump load feedback port Ls is changed through the cooperation of various cartridge valves and reversing valves, and the test loops of the load-sensitive variable pump in an unloading state, a full-displacement state and a variable state are integrated, so that the tested variable pump 2 is connected with the test device once, and the test of three states can be completed. Moreover, by testing the input power and leakage amount in the standby state, the pump performance can be used as one of the bases for evaluating the performance of the tested pump. Meanwhile, the invention judges whether the variable pump 2 is faulty or not through the standby state input power of the variable pump 2 and the oil flow value at the external leakage port L, thereby evaluating the performance of the variable pump 2.
The technical scope of the present invention is not limited to the above description, and those skilled in the art may make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and these changes and modifications should be included in the scope of the present invention.
Claims (10)
1. A test device for a load-sensitive variable pump, the test device comprising:
-an oil tank (1), the oil tank (1) being adapted to supply and recover oil;
a pump inlet interface (3), wherein the pump inlet interface (3) is used for connecting a pump inlet (S) of the variable pump, and the pump inlet interface (3) guides a pump inlet oil way communicated with the oil tank (1);
a pump outlet interface (4), the pump outlet interface (4) being for connecting a pump outlet (P) of the variable pump, and the pump outlet interface (4) leading a hydraulic oil circuit, which communicates with the oil tank (1) via a flow regulating device (20) and a pressure regulating device (30), in which hydraulic oil circuit a first pressure gauge (11) for measuring the pressure at the pump outlet interface (4) and a first flow meter (13) for measuring the flow at the pump outlet interface (4) are arranged;
-a pump load feedback port interface (5), the pump load feedback port interface (5) being for connecting to a pump load feedback port (Ls) of the variable pump, and a second pressure gauge (12) being provided at the pump load feedback port (5) for measuring the pressure thereof;
an external leakage port interface (6), wherein the external leakage port interface (6) is used for connecting an external leakage port of the variable pump, the external leakage port interface (6) guides an external leakage oil path communicated with the oil tank (1), and a second flowmeter (14) for measuring the flow rate at the external leakage port interface (6) is arranged in the external leakage oil path; and
and the reversing valve group (10) is used for adjusting the test device to be suitable for the performances of the variable pump in the unloading loading state, the full-displacement state and the load sensitive variable state respectively.
2. Test device according to claim 1, characterized in that the test device further comprises a variable pump drive joint (7), the variable pump drive joint (7) being connected to a drive motor (8) of the variable pump, a torque sensor (15) and a rotational speed sensor (16) being arranged between the drive motor (8) and the variable pump (2).
3. The test device of claim 1, wherein:
the flow regulating device (20) comprises a first two-way cartridge valve (21), a first two-way cartridge valve cover plate (22) and a two-position four-way reversing valve (25) positioned at a pilot control end of the first two-way cartridge valve (21), wherein the two-position four-way reversing valve (25) is used for controlling the opening and closing of the first two-way cartridge valve (21), and a limit screw of the first two-way cartridge valve cover plate (22) is used for controlling the opening of the first two-way cartridge valve (21);
the pressure regulating device (30) comprises a second two-way cartridge valve (23) and a second two-way cartridge valve cover plate (24), and a limit screw of the second two-way cartridge valve cover plate (24) is used for controlling the opening degree of the second two-way cartridge valve (23);
the reversing valve group comprises a first two-position two-way normally-closed reversing valve (26), a second two-position two-way normally-closed reversing valve (27) and a two-position two-way normally-open reversing valve (28), wherein the first two-position two-way normally-closed reversing valve (26) is connected with the upstream of the first two-way cartridge valve (21) and the pump load feedback port interface (5), the second two-position two-way normally-closed reversing valve (27) is connected with the upstream of the second two-way cartridge valve (23) and the pump load feedback port interface (5), and the two-position two-way normally-closed reversing valve (28) is connected with the load feedback port interface (5) and the oil tank (1).
4. A test device according to claim 3, characterized in that the oil inlet of the two-position four-way reversing valve (25) is connected upstream of the first two-way cartridge valve (21), and the oil return port of the two-position four-way reversing valve (25) is connected to the oil tank (1).
5. A test device according to claim 3, wherein the first two-position two-way normally-closed reversing valve (26) is connected with the oil path of the pump load feedback port interface (5), the second two-position two-way normally-closed reversing valve (27) is connected with the oil path of the pump load feedback port interface (5) and the two-position two-way normally-open reversing valve (28) is connected with the oil path of the pump load feedback port interface (5) in pairs.
6. Test device according to any one of claims 1 to 5, wherein the load feedback port interface (5) is connected with a relief valve (29) to the tank.
7. Method of testing a load sensitive variable pump using a test device according to any of claims 1 to 6, characterized in that a pump inlet (S) of the variable pump (2) is connected to the pump inlet interface (3), a pump outlet (P) of the variable pump (2) is connected to the pump outlet interface (4), a pump load feedback port (Ls) of the variable pump (2) is connected to the pump load feedback port interface (5), and an leakage port (L) of the variable pump (2) is connected to the external leakage port interface (6).
8. The method according to claim 7, wherein the reversing valve group is powered off and the flow regulating device is closed when an unloading state test is performed, the pump load feedback port interface (5) is communicated with the oil tank (1), and the performances of the variable pump (2) under different rotation speeds and different unloading pressures are tested.
9. The method of claim 7, wherein:
the reversing valve group comprises a first two-position two-way normally-closed reversing valve (26), a second two-position two-way normally-closed reversing valve (27) and a two-position two-way normally-open reversing valve (28), the first two-position two-way normally-closed reversing valve (26) is connected with the upstream of the first two-way cartridge valve (21) and the pump load feedback port interface (5), the second two-position two-way normally-closed reversing valve (27) is connected with the upstream of the second two-way cartridge valve (23) and the pump load feedback port interface (5), the two-position two-way normally-open reversing valve (28) is connected with the load feedback port interface (5) and the oil tank (1),
when the full displacement state test is carried out, the first two-position two-way normally-closed reversing valve (26) and the two-position two-way normally-open reversing valve (28) are powered, the pump load feedback port interface (5) is closed with the connection of the oil tank (1), the pump load feedback port interface (5) is connected with the pump outlet interface (4) through the first two-position two-way normally-closed reversing valve (26), and the output flow of the pump outlet interface (4) passes through the flow regulating device and the pressure regulating device, and the variable pump (2) is tested according to a quantitative pump test method.
10. The method of claim 7, wherein:
the reversing valve group comprises a first two-position two-way normally-closed reversing valve (26), a second two-position two-way normally-closed reversing valve (27) and a two-position two-way normally-open reversing valve (28), the first two-position two-way normally-closed reversing valve (26) is connected with the upstream of the first two-way cartridge valve (21) and the pump load feedback port interface (5), the second two-position two-way normally-closed reversing valve (27) is connected with the upstream of the second two-way cartridge valve (23) and the pump load feedback port interface (5), the two-position two-way normally-open reversing valve (28) is connected with the load feedback port interface (5) and the oil tank (1),
when a load sensitive variable state test is carried out, the second two-position two-way normally-closed reversing valve (27) and the two-position two-way normally-open reversing valve (28) are powered, the connection between the pump load feedback port interface (5) and the oil tank (1) is closed, the pump load feedback port interface (5) is connected with the inlet of the pressure regulating device through the second two-position two-way normally-closed reversing valve (27), and the output flow of the pump outlet interface (4) passes through the flow regulating device and the pressure regulating device, and the output flow is regulated through the flow regulating device and the pressure is loaded through the flow controlling device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311059753.5A CN116838598A (en) | 2023-08-21 | 2023-08-21 | Test device and test method for load-sensitive variable pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311059753.5A CN116838598A (en) | 2023-08-21 | 2023-08-21 | Test device and test method for load-sensitive variable pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116838598A true CN116838598A (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311059753.5A Pending CN116838598A (en) | 2023-08-21 | 2023-08-21 | Test device and test method for load-sensitive variable pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116838598A (en) |
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2023
- 2023-08-21 CN CN202311059753.5A patent/CN116838598A/en active Pending
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