A linear conjugate internal meshing gear pump accelerated life test system and method

Abstract

The present invention discloses a linear conjugate internal meshing gear pump accelerated life test system and method, which belongs to the technical field of gear pumps. It corresponds to the same oil tank and sets a load circulation loop and a temperature control circulation loop. By using the combination of the gear pump under test and the first motor, the two-position three-way valve, the proportional throttle valve and other components, and the setting of each component in the temperature control circulation loop, the accelerated life test of the gear pump under test can be accurately completed. The linear conjugate internal meshing gear pump accelerated life test system of the present invention has a simple system structure and a convenient test method, which can meet the accelerated test requirements of the linear conjugate meshing gear pump, has a great promoting effect on determining the use status and fault occurrence of the linear conjugate meshing gear pump, and can greatly shorten the life test time of the gear pump, quickly grasp the operating status changes of the linear conjugate meshing gear pump during the full life cycle, and has good practical value and application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of gear pumps, and in particular relates to an accelerated life test system and method for a linear conjugate internal meshing gear pump. Background Art

[0002] The traditional fault processing-fault identification method for rotating machinery fault diagnosis has been widely used in the field of rolling bearings, plunger pumps and other mechanical equipment. Its specific research steps usually include component disassembly, fault processing, equipment recovery and status detection. For this method, a prerequisite must be met during its use, that is, the equipment has the ability to recover after disassembly.

[0003] For the plunger pump, the rolling elements, inner ring and outer ring of the rolling bearing, the internal distribution plate and sliding shoes of the plunger pump and other equipment components can be disassembled and replaced for maintenance, and the equipment has the same working ability after disassembly and maintenance, so that the research method of fault processing-fault identification can be applied to the field of plunger pumps to a certain extent.

[0004] However, for the linear conjugate internal gear pump, due to its internal gapless compensation device, the fixed gap sealing measures are adopted between the gear, gear ring and pump body, which puts forward higher requirements on the processing accuracy and assembly accuracy of the mating surface. After the pump body is disassembled and the components are taken out, the matching relationship is destroyed. Therefore, it is impossible to simulate the possible faults through the fault processing method, resulting in the traditional fault diagnosis method not being suitable for the linear conjugate internal gear pump. At the same time, if the linear conjugate internal gear pump fails according to the rated working operation, the time required is too long, and the performance evolution law of the linear conjugate internal gear pump cannot be mastered in a short time. Because of this, the existing life test method is difficult to meet the test needs of the linear conjugate gear pump, has obvious limitations, and cannot accurately grasp the changes in the operating status of the linear conjugate internal gear pump during its entire life cycle.

[0005] In addition, foreign accelerated life test research is mainly aimed at aircraft plunger pumps. Due to the different application objects and test standards, its test parameters cannot be directly used on linear conjugate meshing gear pumps. Moreover, there are currently no relevant standards specifically for pump accelerated life tests in China. Some scholars have discussed the influence of speed, pressure, oil temperature, and loading load spectrum on the failure time in the accelerated life test of plunger pumps, and analyzed the influence of increasing the contamination of oil medium on the acceleration coefficient of gear pump accelerated life test, but no mature solutions have been formed to meet the research and application needs of linear conjugate meshing gear pumps. Summary of the invention

[0006] In response to one or more of the above-mentioned defects or improvement needs in the prior art, the present invention provides a linear conjugate internal meshing gear pump accelerated life test system and method, which can realize the accelerated life test of the linear conjugate internal meshing gear pump, improve the efficiency and accuracy of the accelerated life test, and shorten the life test time of the linear conjugate internal meshing gear pump.

[0007] To achieve the above object, one aspect of the present invention provides a linear conjugate internal gear pump accelerated life test system, comprising a load circulation loop and a temperature control circulation loop corresponding to the same oil tank; wherein:

[0008] The load circulation loop is formed based on the gear pump under test, and includes a first motor, a proportional throttle valve, and a two-position three-way valve arranged corresponding to the gear pump under test; the gear pump under test is connected to the oil tank through a first pipeline, the gear pump under test is connected to the proportional throttle valve through a second pipeline, the proportional throttle valve is connected to the two-position three-way valve through a third pipeline, and the two-position three-way valve is connected to the oil tank through a fourth pipeline; and

[0009] A temperature monitoring pipeline with a temperature sensor is provided between the gear pump under test and the oil tank, for monitoring the oil temperature at the oil inlet of the gear pump under test; and a pressure sensor is provided on the second pipeline, for detecting the oil pressure at the oil outlet of the gear pump under test; correspondingly, a flow meter is also provided on the fourth pipeline, one side of which is connected to the two-position three-way valve, and the other side is connected to the fourth pipeline;

[0010] The temperature control circulation loop includes a control valve, a circulation pump and a temperature control unit which are connected in sequence by pipelines, and a second motor is arranged corresponding to the circulation pump. The control valve and the temperature control unit are respectively connected to the oil tank by pipelines to form a circulation loop for controlling the oil temperature in the oil tank.

[0011] As a further improvement of the present invention, a relief valve is also provided in the load circulation loop;

[0012] One end of the overflow valve is connected to the oil tank through a pipeline, and the other end of the overflow valve is connected to the second pipeline through a pipeline.

[0013] As a further improvement of the present invention, the first motor is a three-phase asynchronous variable frequency motor and can achieve stepless speed regulation within a rotation speed range of 600 to 3000 r / min.

[0014] As a further improvement of the present invention, an oil quality sensor is provided on the temperature control circulation loop, and the oil quality sensor is provided on the pipeline between the circulation pump and the temperature control unit;

[0015] and / or

[0016] The control valve is a ball valve.

[0017] As a further improvement of the present invention, an electric heater for heating the oil is provided corresponding to the oil tank, and a controller electrically connected to the temperature sensor is provided corresponding to the electric heater, so that the controller can turn on or off the electric heater according to the detection result of the temperature sensor.

[0018] As a further improvement of the present invention, the temperature control unit is a radiator, which includes a pipeline provided with a one-way valve and a corresponding cooling fan, which is used to cool the oil flowing through the one-way valve.

[0019] Another aspect of the present invention provides a linear conjugate internal gear pump accelerated life test method, which is implemented using the linear conjugate internal gear pump accelerated life test system, and includes the following steps:

[0020] (1) Install the gear pump under test into the load cycle circuit and perform initial running-in according to the specified running-in curve, so that the gear pump under test can reach the normal working standard;

[0021] (2) setting overspeed and overload impact test indicators of the gear pump under test, and conducting an overspeed and overload impact test on the gear pump under test; wherein the overspeed and overload impact test indicators include system oil temperature, test speed, impact pressure, impact frequency, single-step loading time, and single-step unloading time;

[0022] (3) Set the impact judgment interval and volumetric efficiency judgment standard of the gear pump under test to determine the end time of the accelerated life test.

[0023] As a further improvement of the present invention, in step (2), the overspeed overload impact test index is as follows:

[0024] The system oil temperature is 40-60℃; the test speed is the maximum speed of the gear pump being tested; the impact pressure is 1.1-1.4 times the rated pressure of the pump; the impact frequency is 30-50 times / min; and within the duration of a single-step impact, the ratio of loading time to unloading time is 2:1.

[0025] As a further improvement of the present invention, when performing the overspeed overload impact test in step (2), 0-20 μm ACFTD is added to the oil to ensure 5-25 μm NAS11 grade oil cleanliness.

[0026] As a further improvement of the present invention, in step (3), the volumetric efficiency of the gear pump under test is judged every 2000 impacts. If the volumetric efficiency is higher than 82.5%, the process in step (2) is continued; otherwise, the accelerated life test is terminated.

[0027] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0028] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0029] (1) The linear conjugate internal meshing gear pump accelerated life test system of the present invention has a load circulation loop and a temperature control circulation loop corresponding to the same oil tank. By connecting the gear pump under test with the first motor, the two-position three-way valve, the proportional throttle valve and other components in the load circulation loop, the initial running-in and overspeed and overload impact test of the gear pump under test can be realized, and then the accelerated life test of the gear pump under test can be accurately completed; at the same time, through the setting of the temperature control circulation loop, the oil temperature in the load circulation loop can be accurately controlled, ensuring the accuracy of the load impact process control and the accelerated life test results of the gear pump under test, and accurately grasping the operating state changes of the linear conjugate meshing gear pump during the full life cycle.

[0030] (2) The linear conjugate internal gear pump accelerated life test system of the present invention can accurately control the oil temperature during the operation of the entire system through the corresponding settings of components such as electric heating, radiator, and controller, thereby ensuring the consistency of test standards during the accelerated life test, thereby effectively improving the reliability of test results, reducing test errors introduced by the control process, and fully ensuring the accuracy of test results.

[0031] (3) The linear conjugate internal meshing gear pump accelerated life test method of the present invention utilizes the setting of the linear conjugate internal meshing gear pump accelerated life test system, through the setting of the initial running-in and overspeed overload impact test process, in conjunction with the optimization of overspeed overload impact test indicators and the setting of gear pump test judgment standards, it can quickly and accurately complete the accelerated life test of the gear pump under test. The whole process is simple to operate and convenient to control, which can effectively shorten the accelerated life test of the gear pump under test and ensure the accuracy and reliability of the accelerated life test.

[0032] (4) The linear conjugate internal meshing gear pump accelerated life test system of the present invention has a simple system structure and is easy to set up and use. It can realize the accelerated life test of the linear conjugate internal meshing gear pump and meet the accelerated test requirements of the linear conjugate gear pump. It has a great promoting effect on determining the use status and fault occurrence of the linear conjugate gear pump, and can greatly shorten the life test time of the gear pump, and quickly grasp the operating status changes of the linear conjugate gear pump throughout its life cycle. It has good practical value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 Schematic diagram of the principle of the linear conjugate internal gear pump accelerated life test system in the embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the initial running-in curve of the linear conjugate internal gear pump in an embodiment of the present invention;

[0036] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0037] 1. The first motor; 2. The gear pump under test; 3. The temperature sensor; 4. The pressure sensor; 5. The proportional throttle valve; 6. The overflow valve; 7. The two-position three-way valve; 8. The flow meter; 9. The oil tank; 10. The ball valve; 11. The second motor; 12. The circulating pump; 13. The oil quality sensor; 14. The radiator. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] 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 the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect 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.

[0043] Example:

[0044] In a preferred embodiment of the present invention, a linear conjugate internal gear pump accelerated life test system includes a hydraulic component, an electrical component and a monitoring component.

[0045] Among them, the hydraulic components mainly include oil tank 9, proportional throttle valve 5, overflow valve 6, filter, circulation pump 12, radiator 14, hydraulic pipeline and other components, which are mainly used to realize the functions of loading of various working conditions of the test, load overload protection and so on.

[0046] The electrical components mainly include electrical equipment such as motors, (PLC) controllers, relays, frequency converters, electric heaters, etc., which are mainly used for motor speed control, proportional throttle valve 5 opening command control, electric heater and cooling fan opening and closing control, etc. Among them, the electric heater is set corresponding to the oil tank 9, and is used to heat the oil in the oil tank 9. At the same time, the electric heater is electrically connected to the temperature sensor 3 and the controller respectively, so that the controller can realize the opening and closing of the electric heater according to the detection result of the temperature sensor 3.

[0047] The monitoring components mainly include sensor monitoring equipment installed in the accelerated life test system, such as B&K acquisition module, pressure sensor 4, pressure pulsation sensor, vibration acceleration sensor, temperature sensor 3, flow meter 8, oil quality sensor 13, etc., which are used to collect hydraulic pump operating status signals, monitor the operating conditions of the hydraulic system, perform oil temperature feedback adjustment and oil cleanliness detection.

[0048] Specifically, if Figure 1 As shown in (some conventional components are not shown), the accelerated life test system in the preferred embodiment mainly includes a load circulation loop and a temperature control circulation loop corresponding to the same oil tank 9.

[0049] The load circulation loop is formed based on the gear pump 2 under test, and includes a first motor 1 corresponding to the gear pump 2 under test, and the first motor 1 is further preferably an asynchronous motor, which is used to drive the gear pump 2 under test to work. The oil inlet of the gear pump 2 under test is connected to the oil tank 9 through a first pipeline, and the oil outlet is connected to the proportional throttle valve 5 through a second pipeline, and the proportional throttle valve 5 is connected to the two-position three-way valve 7 through a third pipeline, and the two-position three-way valve 7 is connected to the oil tank 9 through a fourth pipeline.

[0050] Correspondingly, an overflow valve 6 is also provided in the load circulation loop, one end of which is connected to the oil tank 9 through a pipeline, and the other end is connected to the second pipeline through a pipeline. In addition, a temperature monitoring pipeline with a temperature sensor 3 is also provided between the gear pump 2 under test and the oil tank 9, which is used to monitor the pump inlet oil temperature of the gear pump 2 under test in real time when it is working. At the same time, a pressure sensor 4 is also provided on the second pipeline to monitor the pump outlet pressure when the gear pump 2 under test is working in a cycle. In addition, a flow meter 8 connected to the two-position three-way valve 7 is also provided on the fourth pipeline, such as Figure 1 as shown in .

[0051] In more detail, the first motor 1 in the preferred embodiment is further specifically a 110kW three-phase asynchronous variable frequency motor, which can preferably achieve stepless speed regulation within the speed range of 600 to 3000r / min. Loading is performed by the proportional throttle valve 5, and 20MPa intermittent loading in the impact condition can be achieved. By setting the load cycle loop, the initial running-in, overspeed overload impact and other test items of the gear pump 2 under test can be correspondingly achieved.

[0052] Furthermore, the temperature control loop in the preferred embodiment is used to control the oil temperature in the oil tank 9 during the overspeed and overload impact stage, and includes a control valve, a circulation pump 12 and a radiator 14 with a one-way valve which are connected in sequence by a pipeline. The control valve is preferably as follows: Figure 1The ball valve 10 shown in the figure is connected to the oil tank 9 through pipelines with the radiator 14, and a cooling fan is provided in the oil circuit corresponding to the radiator 14 to cool the oil passing through the one-way valve. Correspondingly, a second motor 11 is provided corresponding to the operation of the circulating pump 12. Figure 1 as shown in .

[0053] At the same time, an oil quality sensor 13 is also provided in the corresponding temperature control circulation loop, which is further preferably provided in the pipeline between the circulation pump 12 and the radiator 14. Figure 1 As shown in , it is used to detect the oil quality of the oil flowing through.

[0054] In addition, in actual settings, the radiator 14 in the temperature control circulation loop can be replaced by a temperature control unit that can perform temperature increase control and temperature decrease control respectively. The oil in the oil tank 9 is pumped into the loop through the circulation pump 12, and the oil temperature increase or decrease operation can be completed when passing through the temperature control unit. At this time, there is no need to set an electric heater separately for the oil tank 9, only the type of temperature control unit needs to be set accordingly.

[0055] Of course, in actual settings, two temperature control loops can be set, one for temperature reduction control and the other for temperature increase control. At this time, the temperature control units in the two temperature control loops are the heater and the radiator 14 respectively.

[0056] In practical application, the accelerated life test system is used to carry out the accelerated life test of the linear conjugate meshing gear pump. The main process is as follows:

[0057] (1) Install the gear pump 2 under test into the load cycle loop and perform initial running-in according to the prescribed running-in curve, so that the gear pump 2 under test reaches the normal working standard;

[0058] In a preferred embodiment, the initial running-in curve of the gear pump 2 under test is as follows: Figure 2 Of course, it can be understood that when the type and kind of the gear pump 2 under test changes, its initial running-in curve may also change accordingly, which will not be elaborated here.

[0059] (2) setting the overspeed overload impact test index of the gear pump 2 under test, and performing the overspeed overload impact test of the gear pump 2 under test;

[0060] In actual settings, the overspeed and overload impact test indicators of the gear pump 2 under test include system oil temperature, test speed, impact pressure, impact frequency, single-step loading time, and single-step unloading time.

[0061] Among them, the system oil temperature is preferably 40-60°C, and more preferably 50°C. At the same time, the test speed is preferably the maximum speed of the gear pump 2 being tested, and the impact pressure is preferably 1.1-1.4 times the rated pressure of the pump, and more preferably 1.25 times the rated pressure. Accordingly, the impact frequency is preferably 30-50 times / min, and more specifically 40 times / min, and within the duration of a single-step impact, the ratio of the loading duration to the unloading duration is preferably 2:1, that is, taking an impact frequency of 40 times / min as an example, the field of view of a single-step impact is 1.5s, at which time the single-step loading duration is 1.0s, and the single-step unloading duration is 0.5s.

[0062] In more detail, when performing the overspeed overload impact test, it is preferred to add 0-20 μm ACFTD (Air Cleaner Fine Test Dust) to the oil to ensure 5-25 μm NAS11 grade oil cleanliness.

[0063] More specifically, at the beginning of the impact phase, the electric heater for the oil tank 9 is turned on, the circulating pump 12 and the cooling fan are turned off, so that the temperature of the hydraulic oil rises rapidly. When the temperature sensor detects that the oil temperature rises to 50°C, the electric heater is turned off, and the oil circulation system maintains the temperature balance at 45°C to 55°C under the impact test conditions through the oil temperature rise caused by the impact load and the natural circulation heat dissipation. When the oil temperature is detected to be higher than 55°C, the ball valve 10 in the temperature control circulation loop is opened, the circulating pump 12 and the cooling fan are started, the cooling circulation system works, the oil flows into the radiator 14 for cooling, and then returns to the oil tank 9 after cooling; when the oil temperature drops below 45°C, the cooling circuit ball valve 10, the circulating pump 12 and the cooling fan are turned off, the electric heater is turned on, and the oil is heated to raise the temperature to the impact test temperature range.

[0064] (3) The impact determination interval and volumetric efficiency determination standard of the gear pump 2 under test are set to determine the test end time of the accelerated life test.

[0065] In a preferred embodiment, the volumetric efficiency of the gear pump under test is determined every 2000 impacts. If the volumetric efficiency is higher than 82.5%, the overspeed and overload impact test in step (2) is continued; if the volumetric efficiency is lower than 82.5%, it indicates that the pump has failed and the accelerated life test is terminated.

[0066] The linear conjugate internal meshing gear pump accelerated life test system of the present invention has a simple system structure and is easy to set up and use. It can realize the accelerated life test of the linear conjugate internal meshing gear pump and meet the accelerated test requirements of the linear conjugate gear pump. It has a great promoting effect on determining the use status and failure occurrence of the linear conjugate gear pump, and can greatly shorten the life test time of the gear pump, and quickly grasp the operating status changes of the linear conjugate gear pump throughout its life cycle. It has good practical value and application prospects.

[0067] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A linear conjugate internal gear pump accelerated life test system, It is characterized in that It includes a load circulation loop and a temperature control circulation loop corresponding to the same oil tank; wherein, The load circulation loop is formed based on the gear pump under test, and includes a first motor, a proportional throttle valve, and a two-position three-way valve arranged corresponding to the gear pump under test; the gear pump under test is connected to the oil tank through a first pipeline, the gear pump under test is connected to the proportional throttle valve through a second pipeline, the proportional throttle valve is connected to the two-position three-way valve through a third pipeline, and the two-position three-way valve is connected to the oil tank through a fourth pipeline; and A temperature monitoring pipeline with a temperature sensor is provided between the gear pump under test and the oil tank, for monitoring the oil temperature at the oil inlet of the gear pump under test; and a pressure sensor is provided on the second pipeline, for detecting the oil pressure at the oil outlet of the gear pump under test; correspondingly, a flow meter is also provided on the fourth pipeline, one side of which is connected to the two-position three-way valve, and the other side is connected to the fourth pipeline; The temperature control circulation loop includes a control valve, a circulation pump and a temperature control unit which are connected in sequence by pipelines, and a second motor is arranged corresponding to the circulation pump. The control valve and the temperature control unit are respectively connected to the oil tank by pipelines to form a circulation loop for controlling the oil temperature in the oil tank.

2. The linear conjugate internal gear pump accelerated life test system according to claim 1, It is characterized in that An overflow valve is also provided in the load circulation loop; One end of the overflow valve is connected to the oil tank through a pipeline, and the other end of the overflow valve is connected to the second pipeline through a pipeline.

3. The linear conjugate internal gear pump accelerated life test system according to claim 2, It is characterized in that The first motor is a three-phase asynchronous variable frequency motor and can achieve stepless speed regulation within the speed range of 600 to 3000 r / min.

4. The linear conjugate internal gear pump accelerated life test system according to claim 1, It is characterized in that An oil quality sensor is provided on the temperature control circulation loop, and the oil quality sensor is provided on the pipeline between the circulation pump and the temperature control unit; and / or The control valve is a ball valve.

5. The linear conjugate internal gear pump accelerated life test system according to any one of claims 1 to 4, It is characterized in that An electric heater for heating oil is provided corresponding to the oil tank, and a controller electrically connected to the temperature sensor is provided corresponding to the electric heater, so that the controller can turn on or off the electric heater according to the detection result of the temperature sensor.

6. The linear conjugate internal gear pump accelerated life test system according to claim 5, It is characterized in that The temperature control unit is a radiator, which includes a pipeline provided with a one-way valve and a corresponding cooling fan, and is used to cool the oil flowing through the one-way valve.

7. A linear conjugate internal gear pump accelerated life test method, which is implemented by using the linear conjugate internal gear pump accelerated life test system according to any one of claims 1 to 6, It is characterized in that The steps include: (1) Install the gear pump under test into the load cycle circuit and perform initial running-in according to the specified running-in curve, so that the gear pump under test can reach the normal working standard; (2) setting overspeed and overload impact test indicators of the gear pump under test, and conducting an overspeed and overload impact test on the gear pump under test; wherein the overspeed and overload impact test indicators include system oil temperature, test speed, impact pressure, impact frequency, single-step loading time, and single-step unloading time; (3) Set the impact judgment interval and volumetric efficiency judgment standard of the gear pump under test to determine the end time of the accelerated life test.

8. The accelerated life test method for a linear conjugate internal gear pump according to claim 7, It is characterized in that In step (2), the overspeed and overload impact test indicators are as follows: The system oil temperature is 40-60℃; the test speed is the maximum speed of the gear pump being tested; the impact pressure is 1.1-1.4 times the rated pressure of the pump; the impact frequency is 30-50 times / min; and within the duration of a single-step impact, the ratio of loading time to unloading time is 2:

1.

9. The accelerated life test method for a linear conjugate internal gear pump according to claim 7 or 8, It is characterized in that When performing the overspeed overload impact test in step (2), 0-20 μm ACFTD is added to the oil to ensure 5-25 μm NAS11 grade oil cleanliness.

10. The accelerated life test method for a linear conjugate internal gear pump according to claim 7 or 8, It is characterized in that In step (3), the volumetric efficiency of the gear pump under test is determined every 2000 impacts. If the volumetric efficiency is higher than 82.5%, the process in step (2) is continued. Otherwise, the accelerated life test is terminated.

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