Gear ring shell friction pair oil film testing system suitable for internal meshing pump

Abstract

The invention discloses a gear ring shell friction pair oil film test system suitable for an inner gearing pump, which belongs to the technical field of inner gearing pump testing and comprises a test execution assembly, a servo control mechanism, a hydraulic assembly and a data processing assembly which are arranged corresponding to a pump to be tested, the distance between the gear ring and the wall surface of the shell of the pump body under different working conditions can be accurately obtained through the corresponding arrangement of the at least two test holes in the lower shell of the pump and the test sensors in the test holes and the assembly connection of all assemblies and mechanisms, and the test of the oil film thickness of the friction pair is completed. The gear ring shell friction pair oil film testing system suitable for the inner gearing pump is simple in structure and convenient to assemble, oil film testing of a gear ring shell friction pair can be accurately completed, the state of gear ring eccentric motion when a pump body operates under different working conditions is efficiently completed, a basis is provided for characterization of the operation states of the pump body under the different working conditions, and the working efficiency of the pump body under the different working conditions is improved. Theoretical support is provided for design and improvement of the inner gearing pump, and good practical value is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of internal meshing pump testing, and in particular relates to an oil film testing system for a gear ring housing friction pair suitable for an internal meshing pump. Background Art

[0002] For an internal meshing pump or an internal meshing motor, a gear ring is provided inside the housing, and the gear ring cooperates with the gear shaft to form a gear pair between the gear ring and the gear shaft. The engagement and disengagement of the gear pair are utilized to realize the oil suction and discharge process, thereby realizing the operation process of the internal meshing pump or the internal meshing motor.

[0003] Due to the setting and rotation of the gear ring in the housing, a gear ring / housing friction pair structure is formed inside the equipment. The contact surface of the friction pair structure is large and is significantly affected by changes in working conditions, which can easily cause wear failures in the friction pair when the working conditions change. At the same time, during actual operation, a lubricating oil film is formed between the gear ring and the housing. When the matching form of the gear ring and the housing changes, the state of the lubricating oil film will also change accordingly. Therefore, by understanding the changing law of the oil film state when the hydraulic pump / motor operates under variable working conditions and determining the lubrication boundary, it can help avoid friction loss of the gear ring and increase the service life of the equipment.

[0004] For this reason, when designing and researching meshing pumps or meshing motors, how to accurately and efficiently complete the oil film test has become the focus of researchers. At present, there is no mature equipment or method to complete the oil film test of the friction pair of the ring gear housing of an internal meshing pump or internal meshing motor, which makes it impossible to accurately test and characterize the oil film state and the ring gear operating state, which has great limitations. Summary of the invention

[0005] In response to one or more of the above-mentioned defects or improvement needs in the prior art, the present invention provides an oil film testing system for the gear ring and housing friction pair of an internal meshing pump, which can accurately test the oil film thickness of the friction pair between the gear ring and the housing of the internal meshing pump, and judge the operating status of the gear ring through the test of the oil film thickness, realize the equipment status test when the equipment is running under different working conditions, accurately characterize the operating status of the equipment under different working conditions, and extend the service life of the equipment.

[0006] To achieve the above-mentioned object, the present invention provides an oil film test system for a gear ring housing friction pair of an internal meshing pump, which comprises a test execution component, a servo control mechanism, a hydraulic component and a data processing component arranged corresponding to the pump to be tested; The test execution component includes a servo motor, the output shaft of which can be assembled and connected with the gear shaft of the pump to be tested, so as to drive the gear shaft of the pump to be tested to operate under the test condition; The servo control mechanism is electrically connected to the servo motor and is used to set the operating parameters of the servo motor and control the servo motor to complete the operation under corresponding working conditions; The hydraulic assembly comprises an oil tank and an oil suction pipeline and an oil return pipeline arranged between the oil tank and the pump to be tested, and is used to supply hydraulic oil to the pump to be tested and realize the return of hydraulic oil during the test process of the pump to be tested; and The outer periphery of the pump lower shell of the pump to be tested is provided with at least two measuring holes which penetrate the inner cavity of the shell at a certain angle, and a test unit is sealed and embedded in each measuring hole; the axis of the measuring hole passes through the central axis of the inner cavity of the shell and is perpendicular to it; the test unit comprises an adapter and a test sensor, the adapter is sealably assembled in the measuring hole, one end of the adapter close to the inner cavity is coaxially provided with a sensor mounting hole, and the other end of the adapter is provided with a wiring hole connected to the sensor mounting hole; the test sensor is coaxially sealably assembled in the sensor mounting hole, and its data cable is led out through the wiring hole; The data processing component is electrically connected to the data cables of each test sensor, and is used to obtain the data measured by each test sensor, and analyze and obtain the thickness of the oil film to be measured in the area facing each test sensor.

[0007] As a further improvement of the present invention, the adapter is a stepped cylindrical structure, the outer diameter of the middle portion is larger than the outer diameters of the two ends, and an external thread is provided in the middle portion to form a threaded connection section located in the middle portion; and The measuring hole is also in the form of a corresponding stepped hole, and an internal thread is formed on the inner wall surface of the end away from the inner cavity for threaded connection with the threaded connection section.

[0008] As a further improvement of the present invention, a plurality of sealing grooves are circumferentially opened on the outer peripheral wall surface of the adapter close to one end of the inner cavity, and a sealing ring is respectively embedded in each sealing groove, so that after the adapter is set in the measuring hole, each sealing ring presses against the inner wall surface of the measuring hole. As a further improvement of the present invention, a cutting structure that can match with a wrench is provided at one end of the adapter away from the inner cavity, and at least a part of the cutting structure can protrude from the outer wall surface of the lower housing of the pump after the adapter is installed in place.

[0009] As a further improvement of the present invention, the test sensor is sealed and assembled with the sensor mounting hole, and a potting material is poured between the outer peripheral wall surface of the test sensor and the inner peripheral wall surface of the sensor mounting hole.

[0010] As a further improvement of the present invention, the potting material is resin.

[0011] As a further improvement of the present invention, there are two measuring holes arranged at an interval of 90 degrees, and a testing unit is respectively arranged in the two measuring holes.

[0012] As a further improvement of the present invention, the test sensor is an eddy current displacement sensor, which is used to measure the distance between the outer periphery of the gear ring and the test sensor in real time.

[0013] As a further improvement of the present invention, the test execution component further includes a workbench, and the servo motor and the pump to be tested can be placed on the workbench for testing after assembly.

[0014] As a further improvement of the present invention, the data processing component includes a data acquisition unit, a sensor digital display unit and a computer which are electrically connected to each other, and the data acquisition unit is electrically connected to the data cables of each test sensor.

[0015] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0016] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects: (1) The present invention is applicable to the oil film test system of the gear ring housing friction pair of an internal meshing pump, which includes a test execution component, a servo control mechanism, a hydraulic component and a data processing component arranged corresponding to the pump to be tested. At least two measuring holes with axes perpendicularly intersecting the axis of the inner cavity of the housing are opened on the pump lower housing of the pump to be tested corresponding to the gear ring, and a test sensor fixed by a sealed adapter is arranged in each measuring hole. By electrically connecting the test sensor and the data processing component and assembling the test execution component and the hydraulic component with the pump to be tested, the distance between the gear ring and the housing wall of the pump body under different working conditions can be accurately obtained, and the test of the oil film thickness of the friction pair can be completed, thereby providing an accurate basis for judging the operating state of the internal meshing pump under different working conditions, and meeting the operating test requirements of the gear ring housing friction pair of the internal meshing pump.

[0017] (2) The oil film test system for the gear ring housing friction pair of an internal meshing pump of the present invention achieves double-stage sealing between the adapter and the measuring hole by preferably setting the structural form of the adapter and utilizing the combination of sealing groove + sealing ring and threaded connection section for threaded connection. At the same time, by arranging a potting material on the periphery of the test sensor, the sealing between the test sensor and the adapter and between the adapter and the housing can be fully guaranteed, thereby avoiding the problem of hydraulic oil leakage during the test and fully ensuring the accuracy of the test results.

[0018] (3) The gear ring housing friction pair oil film test system of the present invention is suitable for an internal meshing pump. By preferably setting the number of test sensors and the angle between the two test sensors, combined with the acquisition of the outer diameter of the gear ring and the inner diameter of the housing cavity, it is able to obtain the test data of two points and quickly couple the thickness distribution of the oil film to be tested in the entire annular direction, accurately determine the actual operating state of the gear ring, and ensure the accuracy of the gear ring housing friction pair oil film test.

[0019] (4) The oil film test system for the gear ring housing friction pair of the internal gear pump in the present invention has a simple structure and is easy to assemble. It can accurately complete the oil film test of the gear ring housing friction pair and efficiently complete the state of the eccentric movement of the gear ring when the pump body is running under different working conditions. It provides a basis for the characterization of the operating state of the pump body under different working conditions and provides theoretical support for the design and improvement of the internal gear pump, and has good practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 is a structural schematic diagram of an oil film test system for a friction pair of a ring gear housing in an embodiment of the present invention; Figure 2 Schematic diagram of the pump structure for performing oil film test on the friction pair of the ring gear housing in an embodiment of the present invention; Figure 3 is a top view of the lower housing structure of the internal meshing pump tested in an embodiment of the present invention; Figure 4 is a cross-sectional view along the AA direction of the lower housing structure of the internal meshing pump tested in an embodiment of the present invention; Figure 5 It is a stereoscopic diagram of the adapter structure provided for the lower housing of the internal meshing pump in an embodiment of the present invention; Figure 6 is a cross-sectional view of an adapter structure provided for the lower housing of an internal meshing pump in an embodiment of the present invention; Figure 7 is a schematic diagram of the connection settings of various components of a test system in a specific embodiment of the present invention; Figure 8 is the measured value of the trajectory of the eccentric motion of the gear ring in a specific embodiment of the present invention; Fig. 9 is a comparison diagram of experimental and simulation results under eccentric motion of the gear ring in a specific embodiment of the present invention; In all the drawings, the same reference numerals represent the same technical features, specifically: 1. Pump to be tested; 2. Test execution component; 3. Servo control mechanism; 4. Hydraulic component; 5. Data processing component; 6. Oil circuit; 101. First test unit; 102. Second test unit; 103. Oil film to be tested; 104. Lower casing of pump; 1041. First measuring hole; 1042. Second measuring hole; 105. Adapter; 1051. Sensor mounting hole; 1052. Wiring hole; 1053. Sealing groove; 1054. Threaded connection section; 106. Test sensor; 107. Sealing ring; 108. Potting material; 109. Gear ring; 110. Gear; 201. Servo motor; 202. Workbench; 501. Data acquisition unit; 502. Sensor digital display unit; 503. Computer. DETAILED DESCRIPTION

[0022] 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.

[0023] In the description of the present invention, it should be understood that, unless otherwise expressly specified and limited, 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" and the like to indicate 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Example: See also Figure 1 to Figure 6 In a preferred embodiment of the present invention, the gear ring housing friction pair oil film test system suitable for an internal meshing pump includes a test execution component 2, a servo control mechanism 3, a hydraulic component 4 and a data processing component 5 arranged corresponding to the pump 1 to be tested.

[0028] Among them, the test execution component 2 includes a workbench 202 for placing the pump 1 to be tested, and a servo motor 201 arranged on the workbench 202 and correspondingly connected to the gear shaft of the pump 1 to be tested. The output shaft of the servo motor 201 can be assembled and connected with the gear shaft of the pump 1 to be tested, and the servo motor 201 drives the pump 1 to be tested to work under different set working conditions.

[0029] Meanwhile, the servo control mechanism 3 is electrically connected to the servo motor 201, and is used to set the operating parameters of the servo motor 201 and control the servo motor 201 to complete the operation under the corresponding working conditions, wherein the working condition parameters include the motor rotation direction, rotation speed, rotation cycle, etc. The servo control mechanism 3 in the preferred embodiment is a supporting device of the servo motor 201, and can be obtained by using the relevant mature technology about the servo motor 201 in the prior art, and will not be described in detail here.

[0030] Furthermore, the hydraulic assembly 4 in the preferred embodiment is arranged corresponding to the pump 1 to be tested, and includes an oil tank for testing, which is connected to the pump 1 to be tested through an oil circuit 6 to form an oil suction line and an oil return line for supplying oil to the pump 1 to be tested and returning oil from the pump 1 to be tested. At the same time, various valve bodies (such as various check valves, overflow valves, speed regulating valves, proportional pressure reducing valves, proportional throttle valves, etc.), pump bodies (such as loading pumps), motors (such as oil replenishing motors), etc. are arranged in the hydraulic assembly 4 for the circulation and transportation of oil during the test.

[0031] At the same time, in order to ensure the cleanliness of the oil in and out of the oil tank, oil filters are provided at the corresponding oil inlets and outlets of the oil tank, and an oil radiator or oil cooler is connected to the oil return port of the oil tank, so that the return oil temperature after the test can be controlled within a certain range.

[0032] Secondly, it is preferred that an oil quality detector for detecting the quality of the return oil is provided on the return oil pipeline, a flow meter for detecting the oil flow is provided on the oil delivery pipeline, and a liquid level meter is provided on the corresponding oil tank.

[0033] In a specific preferred embodiment, the hydraulic assembly 4 corresponding to the pump 1 to be tested comprises: Figure 7 The various components shown in the figure are connected as follows: First, an oil suction pipeline is provided at the oil outlet of the corresponding oil tank, and an oil return pipeline is provided at the oil inlet of the corresponding oil tank; wherein the oil suction pipeline includes a loading pump, a one-way valve, a proportional pressure reducing valve, and a proportional throttle valve which are connected in sequence by pipelines, and an accumulator is provided between the one-way valve and the proportional pressure reducing valve, and an oil replenishing motor is provided corresponding to the loading pump.

[0034] At the same time, test oil circuits with ball valves are respectively provided for the two oil ports on the pump to be tested 1, and both test oil circuits are connected to one end of the oil suction pipeline provided with a proportional throttle valve, and both test oil circuits are connected to the control oil circuit provided with a proportional electromagnetic overflow valve, and are connected to the return oil pipeline through the test oil circuit. In the control oil circuit, it is preferred that proportional electromagnetic overflow valves are respectively provided for the two test oil circuits, such as Figure 7 as shown in .

[0035] In this embodiment, the oil return pipeline is provided with an air-cooled radiator and an oil heater in sequence, and is connected to the oil return port of the oil tank, and an oil return filter is provided on the oil return port; accordingly, an oil suction filter is provided on the oil outlet of the oil tank. In addition, an oil quality detection pipeline is also provided on the corresponding oil return pipeline, one end of which is connected to the oil tank and the other end is connected to the oil return pipeline, so that the oil returned through the oil return pipeline can be detected by the oil quality detector in the oil quality detection pipeline.

[0036] On the basis of the setting of the above-mentioned oil circuit system, by setting a servo motor 201 corresponding to the pump 1 to be tested, and setting a data acquisition link composed of a test unit and a data acquisition system, by controlling the speed and direction of the servo motor 201, and controlling the opening and closing of each valve body in the oil circuit system, the adjustment and simulation of different working conditions of the pump 1 to be tested are completed, and finally the oil film test of the ring gear housing friction pair of the pump 1 to be tested is completed.

[0037] Furthermore, in order to complete the collection of oil film test data of the ring gear housing friction pair, at least two test units with a certain angle to each other are arranged on the housing of the pump 1 to be tested, and the axis of each test unit passes through the axis of the ring gear.

[0038] It should be noted that the pump 1 to be tested in the preferred embodiment includes an upper housing and a lower housing (i.e., a pump lower housing 104) that are combined, and through holes for the gear shaft to pass through are coaxially opened on the two housings, and an inner cavity for accommodating a gear ring 109, a gear 110, and a crescent plate is opened on the lower housing, the gear ring 109 is coaxially arranged in the inner cavity, the gear 110 is eccentrically arranged in the inner cavity and meshes with the gear ring 109, and a certain thickness of the oil film 103 to be tested is formed between the gear ring 109 and the inner wall surface of the inner cavity. In addition, two oil ports for oil inlet and outlet are opened on the upper housing.

[0039] For this reason, in a preferred embodiment, each test unit is correspondingly disposed on the pump lower housing 104 .

[0040] Specifically, corresponding to the arrangement of the test unit in the preferred embodiment, test holes with axes passing through the axis of the gear ring are opened at certain angles on the pump lower housing 104 for arranging the test unit.

[0041] As follows, through Figure 2~Figure 4 Taking the specific setting form in as an example, the setting form of the test unit on the pump 1 to be tested in the preferred embodiment is described in detail. Accordingly, when the number of test units and the setting angle of the test units change, corresponding adjustments can be made with reference to the following setting form.

[0042] like Figure 2~Figure 4 As shown in the figure, the test units in the preferred embodiment are provided with two, namely, the first test unit 101 and the second test unit 102, the axes of the two test units respectively pass through the axis of the gear ring 109, and the angle between the two test units is 90°. Correspondingly, two measuring holes are correspondingly opened on the pump lower housing 104, namely, the first measuring hole 1041 and the second measuring hole 1042, and the angle between the two measuring holes and the central axis of the pump lower housing 104 is 90°.

[0043] In more detail, the test unit in the preferred embodiment includes a cylindrical adapter 105 and a test sensor 106 disposed in the adapter 105. A sensor mounting hole 1051 is provided in the middle of one end of the adapter 105 corresponding to the setting of the test sensor 106, and a wiring hole 1052 connected to the other end of the adapter 105 is provided corresponding to the sensor mounting hole 1051, so that after the test sensor 106 is coaxially mounted in the sensor mounting hole 1051, its data acquisition cable can be led out from the wiring hole 1052.

[0044] During actual setting, the test sensor 106 is sealed and assembled in the sensor mounting hole 1051, and a potting material 108 is poured between the outer periphery of the test sensor 106 and the inner wall surface of the sensor mounting hole 1051 to improve the sealing of the assembly setting of the test sensor 106 and stably maintain the coaxial setting state of the test sensor 106 in the adapter 105.

[0045] Exemplarily, in a specific preferred embodiment, the potting material 108 is a resin material.

[0046] At the same time, the adapter 105 in the preferred embodiment preferably has a variable diameter multi-section structure, in which the outer diameter of the middle part is larger than the outer diameter of the two ends, and an external thread is opened in the middle to form a threaded connection section 1054; accordingly, the two measuring holes are also arranged in the form of stepped shafts, and the inner diameter of the end away from the inner cavity can be matched with the threaded connection section 1054 in the form of a threaded connection, and an annular step surface is formed in the middle of the measuring hole.

[0047] More preferably, at least one sealing groove 1053 is formed along the circumference of one end of the adapter 105 close to the sensor mounting hole 1051, for example Figure 2 The three or Figure 5 As shown in the two, a sealing ring 107 with a surface protruding from the surface of the adapter 105 is respectively sleeved therein, so that when the adapter 105 is inserted into the corresponding measuring hole, the adapter 105 and the inner wall surface of the measuring hole can be sealed by the sealing ring 107.

[0048] Through the combined arrangement of the sealing ring 107 and the threaded connection section 1054 , a double-stage seal of an O-ring and a pipe thread is provided between the adapter 105 and the pump lower housing 104 , thereby fully ensuring the reliability of the arrangement of the adapter 105 .

[0049] In addition, in order to facilitate the disassembly and assembly of the adapter 105 in the measuring hole, a cutting structure that can match with a wrench is preferably provided at the end of the adapter 105 away from the sensor mounting hole 1051, such as Figure 5Moreover, the length of the adapter 105 is greater than the length of the measuring hole, so that after the adapter 105 is installed in place, at least part of the cutting structure protrudes from the outer wall surface of the pump lower housing 104, thereby facilitating the quick disassembly and assembly of the adapter 105.

[0050] Exemplarily, in a specific preferred embodiment, the test sensor 106 is preferably an eddy current displacement sensor.

[0051] After the adapter 105 is assembled in the corresponding measuring hole, the distance between the front end of each test sensor 106 and the inner wall of the shell is preferably accurately measured by a three-coordinate measuring system, that is, Figure 2 In l A , l B Accordingly, the number of teeth of the gear 110, the number of teeth of the gear ring 109, the outer diameter of the gear ring 109, the inner diameter of the inner cavity of the pump lower housing 104 and the setting angle between the two test sensors 106 can all be directly obtained, providing a basis for the subsequent calculation of the test thickness of different parts of the oil film 103 to be tested and the judgment of the movement state of the gear ring 109.

[0052] After completing the corresponding setting of the two test units on the lower housing 104 of the pump and the assembly setting of the pump 1 to be tested, the pump 1 to be tested is fixedly set on the workbench 202, and its gear shaft is coaxially assembled with the output shaft of the servo motor 201. Correspondingly, the hydraulic component 4 is connected to the two oil ports of the pump 1 to be tested through the oil circuit 6, and the cables of the two test sensors 106 passing through the wiring hole 1052 are electrically connected to the data processing component 5, thereby completing the setting of the gear ring housing friction pair oil film test system. After that, by controlling the servo control mechanism 3, the control of the pump body in forward and reverse directions and at different movement rates can be realized, and the test data under different working conditions can be collected respectively.

[0053] For example, in Figure 1 In the preferred embodiment shown, the data processing component 5 preferably includes a data acquisition unit 501, a sensor digital display unit 502 and a computer 503, which are electrically connected respectively, and the data acquisition unit 501 is electrically connected to each test sensor 106, so that the data processing component 5 can collect data measured by the test sensor 106 at a specific frequency, collect data for the operating status of the pump 1 to be tested under the corresponding working conditions, obtain the thickness value of the oil film 103 to be tested in real time and continuously, and calculate the movement state of the ring gear 109 under the corresponding working conditions based on the oil film thickness values ​​of the two test parts, determine whether the ring gear 109 has excessive eccentric movement, and evaluate the performance of the pump 1 to be tested under different working conditions.

[0054] In order to further highlight the feasibility of the technical solution in the preferred embodiment of the present invention, it is preferred to Figure 7The test is carried out in a specific embodiment in which the connection is completed in the form of an assembled connection.

[0055] In this embodiment, the basic parameters of the pump 1 to be tested are as follows: the number of teeth of the gear 110 is 10; the number of teeth of the gear ring 109 is 13; the outer diameter of the gear ring 109 is 35.96 mm; the inner diameter of the inner cavity of the pump lower housing 104 is 36.00 mm; the distance between the test sensor 106 of the first test unit 101 and the inner cavity wall is l A is 0.186 mm; the distance between the test sensor 106 of the second test unit 102 and the inner cavity wall is l B The angle between the two test sensors 106 is 90°.

[0056] In more detail, the sampling frequency during the experiment is set to 43.5kHz, and the test is performed under the test conditions of 1000rpm and 5MPa. The test data of the pump 1 under test is collected through two test sensors 106, and the data processing component 5 finally completes the data processing.

[0057] When the data is actually processed, the friction clearance between the gear ring 109 and the pump lower housing 104 is used to determine the gear ring 109 in the axial direction of the two test sensors 106 (i.e. Figure 2 In x Axis direction and y The permissible eccentricity range of the axis direction is obtained as follows Figure 8 The measured micro-motion trajectory of the gear ring 109 shown in FIG. Fig. 9 A comparison of experimental data and simulation results is shown in .

[0058] It is not difficult to see from the figure that the experimental results are in good agreement with the simulation results, and the calculation error is less than 7.6%, which is within the acceptable range. Moreover, compared with the simulation process, the actual eccentricity measured value is slightly larger than the simulation value due to the influence of the gravity of the gear ring 109 and the initial eccentric position during assembly in the actual test; the above influence is ignored in the simulation process. In short, the measured value can more truly reflect the actual operating status of the pump body.

[0059] It can be understood that in addition to performing oil film testing on the gear ring housing friction pair of an internal meshing pump, the test system in the preferred embodiment can also perform oil film testing on the gear ring housing friction pair of equipment with similar structure, such as an internal meshing motor, which will not be elaborated here.

[0060] The oil film testing system for the gear ring housing friction pair of the internal meshing pump in the present invention has a simple structure and is easy to assemble. It can accurately complete the oil film test of the gear ring housing friction pair and efficiently complete the state of the eccentric movement of the gear ring when the pump body is running under different working conditions. It provides a basis for characterizing the operating state of the pump body under different working conditions, provides theoretical support for the design and improvement of the internal meshing pump, and has good practical value.

[0061] 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. An oil film test system for the gear ring housing friction pair of an internal gear pump, characterized in that: It includes a test execution component, a servo control mechanism, a hydraulic component and a data processing component corresponding to the pump to be tested; The test execution component includes a servo motor, the output shaft of which can be assembled and connected with the gear shaft of the pump to be tested, so as to drive the gear shaft of the pump to be tested to operate under the test condition; The servo control mechanism is electrically connected to the servo motor and is used to set the operating parameters of the servo motor and control the servo motor to complete the operation under corresponding working conditions; The hydraulic assembly comprises an oil tank and an oil suction pipeline and an oil return pipeline arranged between the oil tank and the pump to be tested, and is used to supply hydraulic oil to the pump to be tested and realize the return of hydraulic oil during the test process of the pump to be tested; and The outer periphery of the pump lower shell of the pump to be tested is provided with at least two measuring holes which penetrate the inner cavity of the shell at a certain angle, and a test unit is sealed and embedded in each measuring hole; the axis of the measuring hole passes through the central axis of the inner cavity of the shell and is perpendicular to it; the test unit comprises an adapter and a test sensor, the adapter is sealably assembled in the measuring hole, one end of the adapter close to the inner cavity is coaxially provided with a sensor mounting hole, and the other end of the adapter is provided with a wiring hole connected to the sensor mounting hole; the test sensor is coaxially sealably assembled in the sensor mounting hole, and its data cable is led out through the wiring hole; The data processing component is electrically connected to the data cables of each test sensor, and is used to obtain the data measured by each test sensor, and analyze and obtain the thickness of the oil film to be measured in the area facing each test sensor.

2. The gear ring housing friction pair oil film testing system suitable for an internal gear pump according to claim 1, characterized in that: The adapter is a stepped cylindrical structure, the outer diameter of the middle portion is larger than the outer diameters of the two ends, and an external thread is provided in the middle portion to form a threaded connection section located in the middle portion; and The measuring hole is also in the form of a corresponding stepped hole, and an internal thread is formed on the inner wall surface of the end away from the inner cavity for threaded connection with the threaded connection section.

3. The gear ring housing friction pair oil film testing system suitable for an internal gear pump according to claim 2, characterized in that: A plurality of sealing grooves are circumferentially formed on the outer peripheral wall surface of the adapter near one end of the inner cavity, and sealing rings are respectively embedded in each sealing groove, so that after the adapter is set in the measuring hole, each sealing ring presses against the inner wall surface of the measuring hole.

4. The gear ring housing friction pair oil film testing system suitable for an internal gear pump according to claim 3, characterized in that: A cutting structure that can be matched with a wrench is arranged at one end of the adapter away from the inner cavity, and at least a part of the cutting structure can protrude from the outer wall surface of the lower housing of the pump after the adapter is installed in place.

5. The oil film testing system for the friction pair of the ring gear housing of an internal gear pump according to any one of claims 1 to 4, characterized in that: The test sensor is sealed and assembled with the sensor installation hole, and a potting material is poured between the outer peripheral wall surface of the test sensor and the inner peripheral wall surface of the sensor installation hole.

6. The gear ring housing friction pair oil film testing system suitable for an internal gear pump according to claim 5, characterized in that: The potting material is resin.

7. The oil film testing system for the friction pair of the ring gear housing of an internal gear pump according to any one of claims 1 to 4 and 6, characterized in that: There are two measuring holes arranged at an interval of 90 degrees, and a testing unit is respectively arranged in the two measuring holes.

8. The oil film testing system for the friction pair of the ring gear housing of an internal gear pump according to any one of claims 1 to 4 and 6, characterized in that: The test sensor is an eddy current displacement sensor, which is used to measure the distance between the outer periphery of the gear ring and the test sensor in real time.

9. The oil film testing system for the friction pair of the ring gear housing of an internal gear pump according to any one of claims 1 to 4 and 6, characterized in that: The test execution assembly also includes a workbench, and the servo motor and the pump to be tested can be placed on the workbench for testing after being assembled.

10. The oil film testing system for the friction pair of the ring gear housing of an internal gear pump according to any one of claims 1 to 4 and 6, characterized in that: The data processing component comprises a data acquisition unit, a sensor digital display unit and a computer which are electrically connected to each other, and the data acquisition unit is electrically connected to the data cables of each test sensor.

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