A high-temperature performance detection device and experimental method for a locomotive gear pump

Abstract

The application discloses a high-temperature performance detection device and experimental method for a locomotive gear pump, which comprises an oil tank, a direct-current speed regulator, a motor, a rotating speed transmission device and control pipelines arranged on the oil tank; the motor drives the gear pump to rotate at a speed controlled by the direct-current speed regulator; the motor adjusts the rotating speed by a motor speed regulator; the gear pump is connected with the motor through the rotating speed transmission device; the motor drives the gear pump to rotate through the rotating speed transmission device; the rotating speed transmission device is provided with an oil inlet hole and an oil outlet hole; the pipelines through which the cooling lubricating oil flows are controlled by opening and closing of one-way valves on the control pipelines, so that the flow value and the pressure value of the gear pump at a certain rotating speed can be measured; if the flow and pressure values of the gear pump at high temperature need to be measured, the oil tank body is heated by connecting the heating device with an interface on the oil tank body, so that the oil temperature in the oil tank body is increased to a required temperature, and then the measurement and detection process is performed; the experimental method is convenient and easy to operate, the device is simple in structure, and the working efficiency can be improved.

Description

Technical Field

[0001] This invention belongs to the field of locomotives and relates to a high-temperature performance testing device and experimental method for locomotive gear pumps. Background Technology

[0002] Locomotive gearboxes use gear transmission to achieve gear ratio changes and transmit torque. High power transmission generates significant heat, easily causing premature wear of gears and bearings. Ordinary splash lubrication cooling is insufficient. To ensure adequate lubrication and cooling of gears and bearings, high-power gearboxes require an external gear pump for forced cooling and lubrication. The performance of the gear pump directly affects the wear of gearbox gears and bearings. To test whether the gear pump performance meets design requirements, it is necessary to test the flow rate and pressure of the gear pump at different speeds under both normal and high-temperature conditions. The existing method, "A Gear Pump Testing Device" (patent number CN 106194739 B, patent holder Nanjing Hangjian Aviation Equipment Technology Service Co., Ltd.), cannot test the performance of the gear pump under high-temperature conditions. Furthermore, this device has three oil tanks: a high-level tank, a normal-temperature tank, and a low-temperature tank, failing to integrate the three tanks into one. Additionally, the variable frequency motor needs to drive the test gear pump through the gearbox to complete speed changes; it cannot be directly connected to the gear pump via a fixed speed transmission device. This device is complex in design and difficult to operate. It is necessary to invent a method to detect the flow rate and pressure of a gear pump at different speeds under normal and high temperature conditions through a process of speed transfer and heat conduction.

[0003] The existing technology is a "Gear Pump Testing Equipment" (patent number CN 106194739 B) invented by Nanjing Hangjian Aviation Equipment Technology Service Co., Ltd. This equipment includes an operating platform, a constant temperature chamber, a high-level oil tank, a normal temperature fuel system, a low temperature fuel system, and a lubricating oil system. The constant temperature chamber and the high-level oil tank are supported by a frame. A test gear pump is installed inside the constant temperature chamber and fixed by a flange. A variable frequency motor is mounted on the frame, and the speed of the variable frequency motor is controlled by a frequency converter. The variable frequency motor drives the test gear pump through a gearbox. The high-level oil tank is connected to the lubricating oil port of the test gear pump inside the constant temperature chamber via a solenoid valve. The relevant tests are performed through the operating platform.

[0004] The equipment includes an operating platform, a constant temperature chamber, a high-level oil tank, a normal temperature fuel system, a low temperature fuel system, and a lubricating oil system. The constant temperature chamber and the high-level oil tank are supported by a frame. A test gear pump is installed inside the constant temperature chamber and secured by a flange. A variable frequency motor is mounted on the frame, and its speed is controlled by a frequency converter. The variable frequency motor drives the test gear pump through a gearbox. The high-level oil tank is connected to the lubricating oil port of the test gear pump inside the constant temperature chamber via a solenoid valve. The normal temperature fuel system includes a normal temperature oil tank, and the oil outlet of the normal temperature oil tank is connected to the oil outlet... The pipeline is connected to the inlet of the test gear pump, and the return port of the ambient temperature fuel tank is connected to the outlet of the test gear pump through a return pipeline; the low-temperature fuel system includes a low-temperature fuel tank, which is connected in parallel with a three-way ball valve on the ambient temperature fuel system through a pump, and is switched through the three-way ball valve; the lubricating oil system includes a lubricating oil tank, which delivers lubricating oil to the gearbox through a pump, and the outlet of the gearbox is connected to the return port of the lubricating oil tank through a pipeline; the operating console is the control system of the testing equipment, which controls the smooth operation of the entire testing equipment.

[0005] Disadvantages of existing technology

[0006] (1) High-temperature testing is not possible. During operation, the locomotive gearbox generates heat, causing the oil temperature to rise. The oil temperature affects flow rate and pressure. Therefore, according to process requirements, a high-temperature test is necessary to check whether the gear pump meets design requirements. Existing testing methods cannot achieve high-temperature performance testing of the gear pump.

[0007] (2) Gear pump speed change is complicated to operate. Existing technology achieves speed change by connecting the frequency converter, motor, gearbox and gear pump in series to drive the gear pump shaft to rotate. Each test requires disassembling and assembling the gearbox and gear pump, which is troublesome to operate. Summary of the Invention

[0008] To solve the above problems, the technical solution adopted by the present invention is: a high-temperature performance testing device for locomotive gear pumps, including an oil tank, a DC speed controller, a motor, a speed transmission device and various control pipelines installed on the oil tank;

[0009] The DC speed controller is connected in sequence to the motor, the speed transmission device, and the gear pump.

[0010] The motor drives the gear pump, and the speed is controlled by a DC speed controller.

[0011] The motor speed is adjusted by a motor speed controller, and the gear pump is connected to the motor through a speed transmission device. The motor drives the gear pump to rotate through the speed transmission device, which is provided with an oil inlet and an oil outlet.

[0012] By controlling the opening and closing of the one-way valves on each control pipeline, the flow of cooling and lubricating oil can be controlled, and the flow rate and pressure of the gear pump at a certain speed can be measured. If it is necessary to measure the flow rate and pressure of the gear pump at a high temperature, the oil tank is heated by connecting to the heating device interface on the oil tank, so that the oil temperature in the oil tank rises to the required temperature before the measurement and testing process is performed.

[0013] Furthermore: Each control pipeline includes a flow meter, heating device interface, filter device, first one-way valve, first pressure gauge, third oil inlet pipe, fourth oil inlet pipe, fifth oil outlet pipe, third check valve, first flange, second flange, fourth check valve, second pressure gauge, sixth check valve, throttle valve and fifth oil pipeline;

[0014] The upper cover of the oil tank is provided with an oil outlet. One end of the first oil pipeline is connected to the oil outlet. The other end of the first oil pipeline is provided with one end of the first one-way valve. The other end of the first one-way valve is connected to one end of the second oil pipeline. The other end of the second oil pipeline is provided with a first pressure gauge and a second one-way valve. One end of the first pressure gauge is connected to a third oil inlet pipe. The third oil inlet pipe is connected to the oil inlet hole of the speed transmission device.

[0015] One end of the fourth oil inlet pipe is connected to the oil outlet of the oil tank, and the other end is connected to the oil inlet hole of the speed transmission device;

[0016] The fourth oil inlet pipe is normally connected to the oil inlet hole of the speed transmission device. According to the measurement and detection content, the fourth oil inlet pipe is disconnected, and the oil inlet hole of the speed transmission device is connected to the third oil inlet pipe.

[0017] The fifth oil outlet pipe is connected to the oil outlet port of the speed transmission device;

[0018] The cooling and lubricating oil in the first oil inlet pipe and the fourth oil inlet pipe flows into the gear pump through the oil inlet hole and flows out to the fifth oil pipeline through the oil outlet hole;

[0019] The fifth oil line is connected to the sixth oil line. One end of the sixth oil line is connected to one end of the first flange, and the other end of the first flange is connected to a flow meter for flow display.

[0020] The sixth oil line is connected to the seventh oil line. A third check valve is installed between the sixth oil line and the seventh oil line. The third check valve is also connected to one end of the fifth oil line. The other end of the seventh oil line is connected to a fourth check valve. The fourth check valve is also connected to the eighth oil line and the ninth oil line. A throttle valve is installed on the eighth oil line to regulate the pressure. A second pressure gauge and the fifth check valve are installed on the ninth oil line.

[0021] The fifth check valve is also connected to the tenth oil line, and a sixth check valve is installed at the end of the tenth oil line; the sixth check valve is normally open.

[0022] The tenth oil line is connected to the eleventh oil line, and a filter device is installed at the end of the eleventh oil line to filter oil. The filter device is connected to the inside of the oil tank through the oil line.

[0023] The experimental method based on the aforementioned high-temperature performance testing device for locomotive gear pumps includes a method for measuring the inlet pressure and outlet flow rate of the gear pump. The method for measuring the inlet pressure and outlet flow rate of the gear pump is as follows:

[0024] Disconnect the fourth oil inlet pipe, connect the third oil inlet pipe to the oil inlet hole of the speed transmission device, open the first check valve, the third check valve, and the fourth check valve, and close the second check valve, the fifth check valve, the first flange, and the second flange;

[0025] After adjusting the motor speed controller to the specified speed, close the third and fourth check valves, and open the second check valve, the first flange, and the second flange. The value of the first pressure gauge at the second check valve is the inlet pressure value at that speed, and the value of the flow meter between the first and second flanges is the outlet flow value at that speed.

[0026] The experimental method based on the locomotive gear pump high temperature performance testing device includes a method for measuring the pressure and flow rate at the gear pump outlet. The method for measuring the pressure and flow rate at the gear pump outlet is as follows: connect the fourth oil inlet pipe to the oil inlet hole of the speed transmission device, open the third check valve and the fourth check valve, and close the fifth check valve and the first flange and the second flange.

[0027] After adjusting the motor speed controller to the specified speed, open the fifth check valve and the first and second flanges, and close the third and fourth check valves. The pressure gauge reading at the second pressure gauge is the outlet pressure value at that speed. The flow meter reading between the first and second flanges is the outlet flow value at that speed. The pressure value is controlled by adjusting the throttle valve. After the pressure reaches the performance requirement, observe whether the flow rate meets the performance requirements.

[0028] An experimental method for a high-temperature performance testing device for a locomotive gear pump, as described in any one of the claims, includes a method for conducting a gear pump break-in test. The gear pump break-in test method is as follows: connect the fourth oil inlet pipe to the speed transmission device, open the third and fourth check valves, close the fifth check valve and the first and second flanges, adjust the motor speed controller to the specified speed and maintain it for the specified time, open the fifth check valve, and check whether the pressure value at the second pressure gauge reaches the specified pressure value.

[0029] An experimental method based on any one of the above-described locomotive gear pump high-temperature performance testing devices includes a method for measuring the performance of the gear pump under high-temperature conditions, wherein the method for measuring the performance of the gear pump under high-temperature conditions is as follows:

[0030] When heating is required, the oil tank is heated by connecting to the heating device through the heating device interface. The oil tank is heated and cooled by heat conduction, simulating a high-temperature state. Then, by repeating the above steps, the changes in flow rate and pressure at different oil temperatures under the same rotation speed can be measured.

[0031] The experimental method based on the locomotive gear pump high temperature performance testing device includes a method for controlling the rotation direction of the gear pump. The method for controlling the rotation direction of the gear pump is as follows: considering that the gear pump can be installed on either side of the gearbox and the rotation direction can be clockwise or counterclockwise, the rotation direction of the motor is adjusted by adjusting the forward and reverse switch of the motor speed controller so that the gear pump always enters oil through the oil inlet and exits oil through the oil outlet.

[0032] During testing, the cooling lubricating oil is first passed through the fifth oil outlet line. After the flow rate stabilizes, the first flange and the second flange are opened, and the third check valve and the fourth check valve are closed, allowing the cooling lubricating oil to pass through the flow meter to test the flow rate.

[0033] This invention provides a high-temperature performance testing device and method for locomotive gear pumps. The invention directly connects the motor and gear pump via a speed transmission device, and adds a heating device to the oil tank. Only the oil tank body needs to be heated, and the speed transmission device needs to be replaced. Performance tests and break-in tests of various types of gear pumps under normal and high-temperature conditions can be completed through two inlet and two outlet oil pipes. The testing method of this invention is convenient and easy to operate, and the designed device structure is simple, achieving the goals of improving work efficiency and reducing costs. It has the following advantages:

[0034] 1. Perform performance tests on gear pumps under high-temperature conditions. A device was designed that incorporates a detachable heating element into the oil tank. By simply heating the oil tank, performance tests and break-in tests of various gear pump models can be conducted at both ambient and high-temperature conditions via two inlet and two outlet oil pipes.

[0035] 2. The gear pump is easy to operate. By designing a speed transmission device to connect the motor to the gear pump, speed changes can be achieved. Testing can be completed without disassembling the gearbox, making operation simple and convenient. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a side view of the device described in this application;

[0038] Figure 2 This is a top view of the device described in this application;

[0039] Figure 3 This is a diagram of a speed transmission device connecting a motor and a gear pump.

[0040] Attached reference numerals: 1. Oil tank; 2. DC speed controller; 3. Motor; 4. Speed ​​transmission device; 5. Flow meter; 6. Heating device interface; 7. Filter device; 8. First check valve; 9. First pressure gauge; 10. Third oil inlet pipe; 11. Fourth oil inlet pipe; 12. Fifth oil outlet pipe; 13. Third check valve; 14. First flange; 15. Second flange; 16. Fourth check valve; 17. Second pressure gauge; 18. Sixth check valve; 19. Throttle valve; 20. Fifth oil pipeline. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0045] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0046] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0047] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0048] Based on the high-temperature performance testing method for locomotive gear pumps, design a high-temperature performance testing device for locomotive gear pumps, such as... Figure 1 , Figure 2 , Figure 3 To complete the testing and experiment.

[0049] Figure 1 This is a side view of the device described in this application;

[0050] Figure 2 This is a top view of the device described in this application;

[0051] A high-temperature performance testing device for a locomotive gear pump includes an oil tank 1, a DC speed controller 2, a motor 3, a speed transmission device 4, a flow meter 5, a heating device interface 6, a filter device 7, a first check valve 8, a first pressure gauge 9, a third oil inlet pipe 10, a fourth oil inlet pipe 11, a fifth oil outlet pipe 12, a third check valve 13, a first flange 14, a second flange 15, a fourth check valve 16, a second pressure gauge 17, a sixth check valve 18, a throttle valve 19, and a fifth oil pipeline 20.

[0052] like Figure 2 The motor speed controller 2 is connected in sequence to the motor 3, the speed transmission device 4, and the gear pump. The motor 3 drives the gear pump, and the speed is controlled by the motor speed controller 2.

[0053] The motor 3 has its speed adjusted by the motor speed controller 2. The gear pump is connected to the motor 3 through the speed transmission device 4. The motor 3 drives the gear pump to rotate through the speed transmission device 4. The speed transmission device 4 is provided with an oil inlet and an oil outlet. The third oil inlet pipe 10 and the fifth oil outlet pipe 12 are both connected to the speed transmission device 4.

[0054] By controlling the opening and closing of the one-way valves on each pipeline to control the flow of cooling and lubricating oil, the flow rate and pressure of the gear pump at a certain speed can be measured. If it is necessary to measure the flow rate and pressure of the gear pump at a high temperature, the oil tank body is heated by connecting to the heating device interface on the oil tank 1 body, so that the oil temperature in the oil tank 1 rises to the required temperature before the measurement and testing process is executed.

[0055] The upper cover of the oil tank 1 is provided with an oil outlet. One end of the first oil pipeline is connected to the oil outlet. The other end of the first oil pipeline is provided with one end of the first one-way valve 8. The other end of the first one-way valve 8 is connected to one end of the second oil pipeline. The other end of the second oil pipeline is provided with a first pressure gauge 9 and a second one-way valve. One end of the first pressure gauge 9 is connected to a third oil inlet pipe 10. The third oil inlet pipe 10 is connected to the oil inlet hole of the speed transmission device 4.

[0056] One end of the fourth oil inlet pipe 11 is connected to the oil outlet of the oil tank 1, and the other end of the fourth oil inlet pipe 11 is connected to the oil inlet hole of the speed transmission device 4.

[0057] The fourth oil inlet pipe is normally connected to the oil inlet of the speed transmission device. According to the measurement and detection content, the fourth oil inlet pipe is disconnected, and the oil inlet of the speed transmission device is connected to the third oil inlet pipe.

[0058] The measurement and detection content refers to the following: the fourth oil inlet pipe is disconnected and the third oil inlet pipe is connected only when the oil inlet pressure needs to be measured; otherwise, the third oil inlet pipe is disconnected and the fourth oil inlet pipe is connected to the oil inlet of the speed transmission device.

[0059] The fifth oil outlet pipe 12 is connected to the oil outlet port of the speed transmission device 4;

[0060] Cooling and lubricating oil in the third oil inlet pipe 10 and the fourth oil inlet pipe 11 flows into the gear pump through the oil inlet hole and flows out to the fifth oil pipe 12 through the oil outlet hole;

[0061] The fifth oil pipeline is connected to the sixth oil pipeline. One end of the sixth oil pipeline is connected to one end of the first flange 14, and the other end of the first flange is connected to a flow meter 5 for flow display.

[0062] The sixth oil line is connected to the seventh oil line. A third check valve 13 is provided between the sixth oil line and the seventh oil line. The third check valve 13 is also connected to one end of the seventh oil line 20. The other end of the seventh oil line 20 is connected to a fourth check valve 16. The fourth check valve 16 is also connected to the eighth oil line and the ninth oil line. A throttle valve 19 is provided on the eighth oil line to regulate the pressure. A second pressure gauge 17 and a fifth check valve are provided on the ninth oil line.

[0063] The fifth check valve is also connected to the tenth oil line, and a sixth check valve 18 is installed at the end of the tenth oil line; the sixth check valve is normally open.

[0064] The tenth oil line is connected to the eleventh oil line, and a filter device 7 is installed at the end of the eleventh oil line to filter oil. The filter device 7 is connected to the inside of the oil tank 1 through the oil line.

[0065] A heating device interface 6 is provided on the side of the oil tank 1;

[0066] Since only a small number of gear pumps require pressure measurement at the inlet, two oil inlet pipes are designed for ease of operation: the fourth oil inlet pipe 11 and the third oil inlet pipe 10. The fourth oil inlet pipe 11 is normally connected to the oil inlet of the speed transmission device 4. When it is necessary to test the pressure of the oil inlet pipe, the fourth oil inlet pipe 10 is disconnected and the third oil inlet pipe 10 is connected to the oil inlet of the speed transmission device 4.

[0067] Figure 3This diagram shows a speed transmission device connecting a motor and a gear pump. The device has an oil inlet and an oil outlet. One side of the oil inlet is connected to either the third oil inlet pipe 10 or the fourth oil inlet pipe 11, and the other side of the oil outlet is connected to the second oil outlet pipe 12. The device connects the motor 3 to one side of the shaft and the gear pump to the other. To test the same model of gear pump, simply connect the gear pump to the test device. To test different models of gear pump, simply replace the speed transmission device 4 with one that matches the gear pump's structural design to complete the performance tests for various models of gear pumps.

[0068] Table 1 shows the performance requirements for the gear pump. During the performance test, the gear pump speed was adjusted to 800 rpm and 1800 rpm according to the performance requirements in Table 1. The pressure and flow rate of the gear pump were tested at both speeds, with check valve 18 in the normally open state.

[0069]

[0070] Table 1: Performance Requirements of Gear Pumps

[0071] Method for measuring the inlet pressure and outlet flow rate of the gear pump: Connect the third oil inlet pipe 10 to the speed transmission device 4, open the first check valve 8, the third check valve 13, and the fourth check valve 16, and close the second check valve, the fifth check valve, the first flange 14, and the second flange 15. The second check valve and the fifth check valve are respectively connected to the first pressure gauge 9 and the second pressure gauge 17.

[0072] After adjusting the motor speed controller 2 to the specified speed, close the third check valve 13 and the fourth check valve 16, and open the second check valve, the fifth check valve, the first flange 14 and the second flange 15. The value of the first pressure gauge at the second check valve is the inlet pressure value at that speed, and the value of the flow meter 5 between the first flange 14 and the second flange 15 is the outlet flow value at that speed.

[0073] Method for measuring the pressure and flow rate at the gear pump outlet: Connect the fourth oil line 11 to the oil inlet of the speed transmission device 4. Open the third check valve 13 and the fourth check valve 16, and close the fifth check valve, the first flange 14, and the second flange 15. Adjust the motor speed controller 2 to the specified speed, then open the fifth check valve, the first flange 14, and the second flange 15, and close the third check valve 13 and the fourth check valve 16. The pressure gauge reading at the second pressure gauge 17 is the outlet pressure value at that speed. The reading on the flow meter 5 between the first flange 14 and the second flange 15 is the outlet flow rate value at that speed. Control the pressure value by adjusting the throttle valve 19. After the pressure reaches the performance requirement, observe whether the flow rate meets the performance requirements.

[0074] The break-in test involves checking whether the pressure value meets the specified requirements at a specified speed and for a specified time. The method for conducting the break-in test is as follows: Connect the fourth oil inlet pipe 11 to the inlet port of the speed transmission device 4. Open the third one-way valve 13 and the fourth one-way valve 16, and close the fifth one-way valve, the first flange 14, and the second flange 15. Adjust the motor speed controller 2 to the specified speed and maintain it for the specified time. Then open the fifth one-way valve and measure whether the pressure value at the second pressure gauge meets the requirements. If the test result does not meet the requirements, the gear pump is unqualified; if it meets the requirements, the gear pump is qualified.

[0075] Method for measuring gear pump performance under high-temperature conditions: To make the measurement more realistic, the gearbox generates heat during operation, causing the overall temperature of the cooling lubricating oil to rise. Therefore, an external heating device interface 6 is installed at the oil tank. When heating is required, the oil tank body 1 is heated by connecting to the heating device through interface 6. The heated oil tank body 1 then heats the cooling lubricating oil through heat conduction, simulating a high-temperature condition. By repeating the above steps, the changes in flow rate and pressure at different oil temperatures under the same rotational speed can be measured.

[0076] Method for controlling the rotation direction of the gear pump: Considering that the gear pump can be installed on either side of the gearbox and its rotation direction can be clockwise or counterclockwise, the rotation direction of the motor 3 is adjusted by regulating the forward and reverse switch of the motor speed controller 2, so that the gear pump always receives oil through the inlet and exits oil through the outlet. To protect the flow meter 5 from the impact of unstable flow and accelerated failure, a fifth oil outlet line 20 is added. During testing, the cooling lubricating oil first passes through the fifth oil outlet line 20. After the flow stabilizes, the first flange 14 and the second flange 15 are opened, and the third check valve 13 and the fourth check valve 16 are closed, allowing the cooling lubricating oil to pass through the flow meter 5 to test the flow rate.

[0077] This invention can eliminate the third oil inlet pipe 10, install the check valve 9 and pressure gauge 1 on the fourth oil inlet pipe 12, and eliminate the fifth oil line 20, the third check valve 13, and the fourth check valve 16, allowing the cooling lubricating oil to pass directly through the flow meter 5.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-temperature performance testing device for locomotive gear pumps, characterized in that: It includes an oil tank, as well as a DC speed controller, motor, speed transmission device and various control pipelines installed on the oil tank; The DC speed controller is connected in sequence to the motor, the speed transmission device, and the gear pump. The motor drives the gear pump, and the speed of the gear pump is controlled by the speed transmission device. The motor speed is adjusted by a DC speed controller, the gear pump is connected to the motor through a speed transmission device, and the motor drives the gear pump to rotate through the speed transmission device. The speed transmission device is provided with an oil inlet and an oil outlet. By controlling the opening and closing of the one-way valves on each control pipeline, the flow of cooling and lubricating oil can be controlled, and the flow rate and pressure of the gear pump at a certain speed can be measured. If it is necessary to measure the flow rate and pressure of the gear pump at a high temperature, the oil tank is heated by connecting to the heating device interface on the oil tank, so that the oil temperature in the oil tank rises to the required temperature before the measurement and testing process is performed. Each control pipeline includes a flow meter, heating device interface, filter device, first check valve, first pressure gauge, third oil inlet pipe, fourth oil inlet pipe, fifth oil outlet pipe, third check valve, first flange, second flange, fourth check valve, second pressure gauge, sixth check valve, throttle valve, and fifth oil pipeline; The upper cover of the oil tank is provided with an oil outlet, which is connected to one end of the first oil pipeline. A first check valve is provided between the first oil pipeline and the second oil pipeline. A first pressure gauge and a second check valve are provided at one end of the second oil pipeline. One end of the first pressure gauge is connected to a third oil inlet pipe, which is connected to the oil inlet hole of the speed transmission device. One end of the fourth oil inlet pipe is connected to the oil outlet of the oil tank, and the other end is connected to the oil inlet hole of the speed transmission device; The fourth oil inlet pipe is normally connected to the oil inlet hole of the speed transmission device. According to the measurement and detection content, the fourth oil inlet pipe is disconnected, and the oil inlet hole of the speed transmission device is connected to the third oil inlet pipe. The fifth oil outlet pipe is connected to the oil outlet port of the speed transmission device; The cooling and lubricating oil in the third and fourth oil inlets flows into the gear pump through the oil inlet and flows out to the fifth oil line through the oil outlet. The fifth oil line is connected to the sixth oil line. One end of the sixth oil line is connected to one end of the first flange, and the other end of the first flange is connected to a flow meter for flow display. The sixth oil line is connected to the seventh oil line. A third check valve is installed between the sixth oil line and the seventh oil line. The third check valve is also connected to one end of the fifth oil line. The other end of the seventh oil line is connected to a fourth check valve. The fourth check valve is also connected to the eighth oil line and the ninth oil line. A throttle valve is installed on the eighth oil line to regulate the pressure. A second pressure gauge and the fifth check valve are installed on the ninth oil line. The fifth check valve is also connected to the tenth oil line, and a sixth check valve is installed at the end of the tenth oil line; the sixth check valve is normally open. The tenth oil line is connected to the eleventh oil line, and a filter device is installed at the end of the eleventh oil line to filter oil. The filter device is connected to the inside of the oil tank through the oil line.

2. The experimental method for a high-temperature performance testing device for a locomotive gear pump according to claim 1, characterized in that: The method includes measuring the inlet pressure and outlet flow rate of a gear pump, and the method for measuring the inlet pressure and outlet flow rate of the gear pump is as follows: Disconnect the fourth oil inlet pipe, connect the third oil inlet pipe to the oil inlet hole of the speed transmission device, open the first check valve, the third check valve, and the fourth check valve, and close the second check valve, the fifth check valve, the first flange, and the second flange; After adjusting the motor speed controller to the specified speed, close the third and fourth check valves, and open the second check valve, the first flange, and the second flange. The value of the first pressure gauge at the second check valve is the inlet pressure value at that speed, and the value of the flow meter between the first and second flanges is the outlet flow value at that speed. It also includes a method for measuring the pressure and flow rate at the outlet of the gear pump, which is as follows: connect the fourth oil inlet pipe to the oil inlet hole of the speed transmission device, open the third check valve and the fourth check valve, and close the fifth check valve and the first flange and the second flange; After adjusting the motor speed controller to the specified speed, open the fifth check valve and the first and second flanges, and close the third and fourth check valves. The pressure gauge reading at the second pressure gauge is the outlet pressure value at that speed, and the flow meter reading between the first and second flanges is the outlet flow value at that speed. The pressure value is controlled by adjusting the throttle valve. After the pressure reaches the performance requirement, observe whether the flow rate meets the performance requirements. It also includes a method for measuring the performance of a gear pump under high-temperature conditions, the method for measuring the performance of a gear pump under high-temperature conditions being as follows: When heating is required, the oil tank is heated by connecting to the heating device through the heating device interface. The oil tank is heated and cooled by heat conduction, simulating a high-temperature state. This allows for the measurement of flow rate and pressure changes at different oil temperatures under the same rotational speed.

3. The experimental method for a high-temperature performance testing device for a locomotive gear pump according to claim 2, characterized in that: The method includes a gear pump break-in test, which is as follows: connect the fourth oil inlet pipe to the speed transmission device, open the third and fourth check valves, close the fifth check valve and the first and second flanges, adjust the motor speed controller to the specified speed and maintain it for the specified time, open the fifth check valve, and check whether the pressure value at the second pressure gauge reaches the specified pressure value.

4. The experimental method for a high-temperature performance testing device for a locomotive gear pump according to claim 2, characterized in that: The method includes controlling the rotation direction of the gear pump. The method for controlling the rotation direction of the gear pump is as follows: Considering that the gear pump can be installed on either side of the gearbox and the rotation direction can be clockwise or counterclockwise, the rotation direction of the motor is adjusted by adjusting the forward and reverse switch of the motor speed controller so that the gear pump always enters oil through the oil inlet and exits oil through the oil outlet. During the test, the cooling lubricating oil is first passed through the fifth oil pipeline. After the flow rate stabilizes, the first flange and the second flange are opened, and the third check valve and the fourth check valve are closed, so that the cooling lubricating oil passes through the flow meter to test the flow rate.

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