Hydraulic fluid wear resistance testing unit

Abstract

The utility model discloses a hydraulic fluid anti-wear performance testing unit, which relates to the technical field of hydraulic fluid performance testing and comprises a shell, a stator, a rotor, a large blade, a small blade, an upper oil distribution disc and a lower oil distribution disc, a hollow cavity is arranged in the shell, and the upper oil distribution disc, the stator and the lower oil distribution disc form a pump body. The rotor is rotatably connected in the pump body around a first rotating shaft, an oil cavity in the pump body forms an oil pumping area, and an oil cavity outside the pump body forms an oil outlet area; a first type of groove and a second type of groove are formed in the rotor, the large blades are arranged in the first type of groove and can slide in the radial direction of the rotor along with rotation of the rotor, the small blades are detachably connected in the second type of groove, and the bottoms of the small blades make contact with the lower oil distribution disc. The hydraulic fluid anti-wear performance test unit can truly simulate the working state of a vane pump and the working environment of vanes, and the hydraulic fluid performance can be well evaluated.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic fluid performance test technical field especially relates to a hydraulic fluid antiwear performance test unit. BACKGROUND

[0002] The vane pump is an important hydraulic power component, and its internal structure is complex, and multiple friction pairs work simultaneously in the working process. Hydraulic fluid can lubricate the friction pairs and prolong the service life of the vane pump. However, if the antiwear performance of the hydraulic fluid is weak, the vane will be severely worn, the movement law of the vane will change, and then the vibration and noise of the pump will be caused, the volumetric efficiency of the pump will be affected, and finally the pump will be invalid, so the test of the antiwear performance of the hydraulic fluid is very important. The conventional standard friction tester such as four-ball friction tester, SRV friction and wear tester and other general test equipment cannot simulate the actual environment in the vane pump, and the correlation of the test result with the vane pump is poor. Therefore, a hydraulic fluid antiwear performance test unit with stronger correlation with the vane pump, which can truly simulate the working state of the vane pump and the working environment of the vane, and evaluate the performance of the hydraulic fluid well, is urgently needed. SUMMARY

[0003] The utility model discloses a hydraulic fluid antiwear performance test unit to solve the problem existing in the prior art, and the correlation with the vane pump is stronger, the working state of the vane pump and the working environment of the vane can be truly simulated, and the performance of the hydraulic fluid can be evaluated well.

[0004] To achieve the above object, the utility model provides the following scheme:

[0005] This utility model provides a hydraulic fluid wear resistance testing unit, comprising: a housing, a stator, a rotor, large blades, small blades, an upper distribution plate, and a lower distribution plate. The housing has a hollow cavity. The lower distribution plate is fixedly connected to the bottom of the cavity. The stator is annular and fixedly connected to the upper end of the lower distribution plate. The upper distribution plate is fixedly connected to the upper end of the stator. The upper distribution plate, the stator, and the lower distribution plate form a pump body. The rotor is rotatably connected to the pump body around a first rotating shaft, which coincides with the central axis of the rotor. There is a gap between the central axis of the rotor and the central axis of the stator. The lower distribution plate divides the cavity into an oil suction area and an oil chamber. The oil chamber inside the pump body forms the pumping area, and the oil chamber outside the pump body forms the outlet area. The lower distribution plate is provided with an oil inlet groove connecting the suction area and the pumping area. The upper distribution plate is provided with an oil outlet groove connecting the pumping area and the outlet area. The outer shell is provided with an oil inlet connecting the inlet area to the outside and an oil outlet connecting the outlet area to the outside. The rotor is used to connect to an external power source. The rotor is provided with a first type of groove and a second type of groove. The large blade is set in the first type of groove and can slide radially along the rotor as the rotor rotates. The small blade is detachably connected in the second type of groove, and the bottom of the small blade contacts the lower distribution plate.

[0006] In some embodiments, a fixing bolt is also included, and a fixing screw hole is provided on the side of the rotor to connect the second type of groove with the outside. The fixing bolt is screwed into the fixing screw hole and abuts against the side of the small blade. The assembly method between the large blade and the first type of groove is clearance fit.

[0007] In some embodiments, an axial fastener is also included, which is fixedly installed in the second type of groove and located at the top of the small blade. The small blade and the second type of groove are assembled by an interference fit, and the bottom of the axial fastener contacts the top of the small blade.

[0008] In some embodiments, the first type of groove and the second type of groove are evenly spaced along the circumferential direction of the rotor and the number of the first type of groove and the second type of groove are equal. Each first type of groove is provided with the large blade and each second type of groove is provided with the small blade.

[0009] In some embodiments, a tenoned bolt is also included, which passes through the upper oil distribution plate, the stator, and the lower oil distribution plate and secures the upper oil distribution plate, the stator, and the lower oil distribution plate together.

[0010] In some embodiments, the housing includes an upper cover and a base, the lower end of the upper cover being detachably connected to the upper end of the base, the oil inlet being disposed on the base, the oil outlet being disposed on the upper cover, and the lower end of the base being used to connect to a hydraulic lifting platform.

[0011] In some embodiments, a drive shaft is also included. The upper cover and the upper oil distribution plate are provided with mounting through holes. One end of the drive shaft passes through two of the mounting through holes and is detachably fixed to the rotor by a drive positioning pin. The drive shaft is coaxially arranged with the rotor and is used to connect to power equipment.

[0012] In some embodiments, the upper side of the base is provided with a mounting groove, the lower oil distribution plate is detachably fixedly connected in the mounting groove, the side wall of the lower oil distribution plate is in contact with the side wall of the mounting groove, there is a gap between the bottom of the lower oil distribution plate and the inner bottom surface of the mounting groove, and the oil suction area is formed between the lower oil distribution plate and the inner bottom surface of the mounting groove.

[0013] In some embodiments, a lower positioning pin is also included. The lower oil distribution plate is provided with a vertical first insertion hole, the axis of the first insertion hole is spaced apart from the central axis of the lower oil distribution plate, and the base is provided with a second insertion hole communicating with the first insertion hole. The lower positioning pin is inserted into the first insertion hole and the second insertion hole.

[0014] In some embodiments, a connecting bolt is also included. The base is provided with a connecting through hole that connects the two sides of the base. The lower end face of the upper cover is provided with a mounting screw hole corresponding to the position of the connecting through hole. The connecting bolt passes through the connecting through hole and is threaded into the mounting screw hole.

[0015] The present invention achieves the following technical advantages over the prior art:

[0016] The hydraulic fluid wear resistance testing unit provided by this utility model has a rotor that rotates eccentrically relative to the stator during operation. The large blades move radially along the rotor as the rotor rotates, thereby pumping hydraulic fluid. The hydraulic fluid enters the suction area from the oil inlet, passes through the oil inlet groove and is sucked into the pumping area, then passes through the oil outlet groove and enters the oil outlet area, and finally is discharged from the oil outlet. The hydraulic fluid circulates in the testing unit, realistically simulating the working state of the vane pump and the working environment of the blades. Simultaneously, during rotor rotation, the end face of the large blade forms a friction pair with the inner wall of the stator, simulating the friction between the blade and the inner wall of the stator in a vane pump. By weighing the large blade before and after operation, the operator can simultaneously evaluate the lubrication of the hydraulic fluid between the blade and the inner wall of the stator, and between the blade and the lower distribution plate. The small blade is fixedly connected in the second type of groove, and its bottom forms a friction pair with the lower distribution plate, simulating the friction between the blade and the lower distribution plate in a vane pump. By weighing the second blade before and after operation, the operator can evaluate the lubrication of the hydraulic fluid between the blade and the lower distribution plate in a vane pump. Therefore, the hydraulic fluid anti-wear performance testing unit in this invention can realistically simulate the working state of the vane pump and the working environment of the blade, and effectively evaluate the wear of the blade in the vane pump, thereby effectively evaluating the anti-wear performance of the hydraulic fluid. This facilitates rapid and effective pre-screening and sorting of hydraulic fluids during the oil development stage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the hydraulic fluid anti-wear performance testing unit in some embodiments of this utility model;

[0019] Figure 2 for Figure 1 Exploded view of the hydraulic fluid anti-wear performance testing unit;

[0020] Figure 3 for Figure 1 Cross-sectional view of the hydraulic fluid anti-wear performance testing unit;

[0021] Figure 4 This is a three-dimensional structural diagram of the rotor and lower oil distribution plate in some embodiments of this utility model;

[0022] Figure 5 for Figure 4 A cross-sectional view of the moving part along a horizontal plane;

[0023] Figure 6 for Figure 4 A cross-sectional view of the central moving part along another horizontal plane;

[0024] In the diagram: 1. Top cover; 2. Base support; 3. Stator; 4. Rotor; 5. Large blade; 6. Small blade; 7. Lower oil distribution plate; 8. Upper oil distribution plate; 9. Drive shaft; 10. Oil chamber; 11. Oil suction area; 12. Oil outlet area; 13. Pumping area; 14. Oil inlet; 15. Oil outlet; 16. Oil inlet groove; 17. Oil outlet groove; 18. Type I groove; 19. Type II groove; 20. Tenon bolt; 21. Axial fixing component; 22. Lower positioning pin; 23. Connecting bolt; 24. Drive positioning pin; 25. Fixing bolt. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this invention is to provide a hydraulic fluid anti-wear performance testing unit to solve the problems existing in the prior art. It has a stronger correlation with vane pumps and can realistically simulate the working state of vane pumps and the working environment of vanes, so as to effectively evaluate the performance of hydraulic fluid.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] This utility model provides a hydraulic fluid wear resistance testing unit, such as... Figures 1-6As shown, the pump includes: a housing, a stator 3, a rotor 4, large blades 5, small blades 6, an upper oil distribution plate 8, and a lower oil distribution plate 7. The housing has a hollow cavity. The lower oil distribution plate 7 is fixedly connected to the bottom of the cavity. The stator 3 is annular and fixedly connected to the upper end of the lower oil distribution plate 7. The upper oil distribution plate 8 is fixedly connected to the upper end of the stator 3. The upper oil distribution plate 8, stator 3, and lower oil distribution plate 7 form the pump body. The rotor 4 is connected to the pump body and rotates around a first rotating shaft. The first rotating shaft coincides with the central axis of the rotor 4. There is a gap between the central axis of the rotor 4 and the central axis of the stator 3. The lower oil distribution plate 7 divides the cavity into an oil suction area 11 and an oil chamber 10. The oil chamber 10 within the pump body forms the pumping oil area 13. The oil chamber 10 outside the pump body forms an oil outlet area 12. The lower oil distribution plate 7 is provided with an oil inlet groove 16 that connects the oil suction area 11 and the oil pumping area 13. The upper oil distribution plate 8 is provided with an oil outlet groove 17 that connects the oil pumping area 13 and the oil outlet area 12. The outer shell is provided with an oil inlet 14 that connects the oil inlet area to the outside and an oil outlet 15 that connects the oil outlet to the outside. The rotor 4 is used to connect to an external power source. The rotor 4 is provided with a first type of groove 18 and a second type of groove 19. The large blade 5 is located in the first type of groove 18 and can slide radially along the rotor 4 as the rotor 4 rotates. The small blade 6 is detachably connected in the second type of groove 19. The bottom of the small blade 6 is in contact with the lower oil distribution plate 7.

[0029] The hydraulic fluid wear resistance testing unit provided by this utility model has a rotor 4 with an equal number of large blades 5 and small blades 6 distributed at intervals. During operation, the rotor 4 rotates eccentrically relative to the stator 3. The large blades 5 move radially along the rotor as the rotor 4 rotates, thereby pumping hydraulic fluid. The hydraulic fluid enters the suction zone 11 from the oil inlet 14, passes through the oil inlet groove 16 and is sucked into the pumping zone 13, then passes through the oil outlet groove 17 and enters the oil outlet zone 12, and finally is discharged from the oil outlet 15. The hydraulic fluid circulates in the testing unit, realistically simulating the working state of the vane pump and the working environment of the blades. Simultaneously, during the rotation of rotor 4, the end face of the large blade 5 forms a friction pair with the inner wall of stator 3, simulating the friction between the blade and the inner wall of stator 3 in a vane pump. By weighing the large blade 5 before and after operation, the operator can simultaneously evaluate the lubrication of the hydraulic fluid between the blade and the inner wall of stator 3, and between the blade and the lower distribution plate 7. The small blade 6 is fixedly connected in the second type of groove 19, and the bottom of the small blade 6 forms a friction pair with the lower distribution plate 7, simulating the friction between the blade and the lower distribution plate 7 in a vane pump. By weighing the second blade before and after operation, the operator can evaluate the lubrication of the hydraulic fluid between the blade and the lower distribution plate 7 in a vane pump. Therefore, the hydraulic fluid anti-wear performance testing unit in this invention can realistically simulate the working state of the vane pump and the working environment of the blade, and effectively evaluate the wear of the blade in the vane pump, thereby effectively evaluating the anti-wear performance of the hydraulic fluid, so as to quickly and effectively pre-screen and sort the hydraulic fluid during the oil development stage.

[0030] In this first embodiment, the hydraulic fluid wear resistance testing unit provided by this utility model further includes a fixing bolt 25. The side of the rotor 4 is provided with a fixing screw hole communicating with the second type groove 19 and the outside. The fixing bolt 25 is screwed into the fixing screw hole and abuts against the side of the small blade 6. The fixing bolt 25 can prevent the small blade 6 from sliding radially due to the centrifugal force of the rotor 4's rotation, ensuring that the small blade 6 remains stationary during the rotor 4's rotation. The large blade 5 is assembled with the first type groove 18 in a clearance fit, allowing the large blade 5 to slide within the first type groove 18.

[0031] In this first embodiment, the hydraulic fluid wear resistance testing unit provided by this utility model further includes an axial fixing member 21. The axial fixing member 21 is fixedly installed in the second type groove 19 and located at the top of the small blade 6. The small blade 6 and the second type groove 19 are assembled by an interference fit, and the bottom of the axial fixing member 21 contacts the top of the small blade 6. The axial fixing member 21 can limit the small blade 6 from the axial direction of the rotor 4, so that the bottom surface of the small blade 6 fits against the upper surface of the lower oil distribution plate 7. Preferably, the axial fixing member 21 is spherical, and the axial fixing member 21 and the second type groove 19 are in a transition fit. As long as the position along the axial and radial directions of the rotor 4 is determined, the second blade can be limited without changing the axial fixing angle, making installation more convenient. At the same time, it can maximize the fit between the end face of the small blade 6 and the upper end face of the lower oil distribution plate 7 when under pressure.

[0032] In this embodiment, the first type of groove 18 and the second type of groove 19 are evenly spaced along the circumference of the rotor 4 and the number of the first type of groove 18 and the second type of groove 19 are equal. Each first type of groove 18 is provided with a large blade 5 and each second type of groove 19 is provided with a small blade 6.

[0033] In this first embodiment, the hydraulic fluid wear resistance testing unit provided by this utility model further includes a tenoned bolt 20. The tenoned bolt 20 passes through the upper oil distribution plate 8, the stator 3, and the lower oil distribution plate 7, and fixes the upper oil distribution plate 8, the stator 3, and the lower oil distribution plate 7 together. The tenoned bolt 20 can firmly fix the upper oil distribution plate 8, the stator 3, and the lower oil distribution plate 7 together, improving the reliability of the connection.

[0034] In this embodiment, the outer casing includes an upper cover 1 and a base 2. The lower end of the upper cover 1 is detachably connected to the upper end of the base 2. An oil inlet 14 is located on the base 2, and an oil outlet 15 is located on the upper cover 1. The lower end of the base 2 is connected to a hydraulic lifting platform. During testing, the upper end of the upper cover 1 can be vertically limited, and a force is applied to the base 2 vertically through a hydraulic test bench. This allows the entire hydraulic fluid wear resistance testing unit to operate under harsh pressure conditions, simulating the working environment of a vane pump under harsh operating conditions. The test results can provide technical support for the research and development and application of high-performance hydraulic fluids under harsh conditions. Furthermore, by pressurizing the base 2, the friction between the small vane 6 and the lower distribution plate 7 can be increased, accelerating the wear rate of the small vane 6, thereby increasing the test speed and shortening the test cycle.

[0035] In this first embodiment, the hydraulic fluid wear resistance testing unit provided by this utility model further includes a drive shaft 9. Mounting through holes are provided on both the upper cover 1 and the upper oil distribution plate 8. One end of the drive shaft 9 passes through two mounting through holes and is detachably fixed to the rotor 4 via a drive positioning pin 24. The drive shaft 9 is coaxially arranged with the rotor 4 and is used to connect to a power device. The drive shaft 9 can connect to a power source and transmit torque to the rotor 4, thereby causing the rotor 4 to rotate.

[0036] In this first embodiment, a mounting groove is provided on the upper side of the base 2, and the lower oil distribution plate 7 is detachably fixedly connected in the mounting groove. The side wall of the lower oil distribution plate 7 fits against the side wall of the mounting groove, and there is a gap between the bottom of the lower oil distribution plate 7 and the inner bottom surface of the mounting groove. An oil suction area 11 is formed between the lower oil distribution plate 7 and the inner bottom surface of the mounting groove. When the actuator rotates, hydraulic fluid enters from the oil inlet 14, then enters the oil suction area 11, and then enters the pump through the oil inlet groove 16. Under the pumping of the large blade 5, it is pumped out through the oil outlet groove 17 and finally flows out from the oil outlet 15.

[0037] In this first embodiment, the hydraulic fluid wear resistance testing unit provided by this utility model further includes a lower positioning pin 22. A vertical first insertion hole is provided on the lower distribution plate 7, with a distance between the axis of the first insertion hole and the central axis of the lower distribution plate 7. A second insertion hole communicating with the first insertion hole is provided on the base 2. The lower positioning pin 22 is inserted into the first and second insertion holes. The lower positioning pin 22 can limit the lower distribution plate 7 in the circumferential direction, thereby preventing the lower distribution plate 77 from rotating due to friction of the second blade.

[0038] In this first embodiment, a connecting bolt 23 is also included. The base 2 has a connecting through hole connecting both sides of the base 2, and the lower end face of the upper cover 1 has a mounting screw hole corresponding to the position of the connecting through hole. The connecting bolt 23 passes through the connecting through hole and is threaded into the mounting screw hole. Connecting the base 2 and the upper cover 1 with the connecting bolt 23 facilitates the disassembly and installation of the outer casing.

[0039] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A hydraulic fluid wear resistance testing unit, characterized in that: include: The pump comprises a housing, a stator, a rotor, large blades, small blades, an upper oil distribution plate, and a lower oil distribution plate. The housing has a hollow cavity. The lower oil distribution plate is fixedly connected to the bottom of the cavity. The stator is annular and fixedly connected to the upper end of the lower oil distribution plate. The upper oil distribution plate is fixedly connected to the upper end of the stator. The upper oil distribution plate, the stator, and the lower oil distribution plate form the pump body. The rotor rotates around a first axis connected to the pump body. The first axis coincides with the central axis of the rotor. There is a gap between the central axis of the rotor and the central axis of the stator. The lower oil distribution plate divides the cavity into an oil suction area and an oil chamber. The oil chamber within the pump body forms... The pumping area includes an oil chamber outside the pump body forming an oil outlet area. The lower distribution plate has an oil inlet groove connecting the suction area and the pumping area. The upper distribution plate has an oil outlet groove connecting the pumping area and the outlet area. The outer casing has an oil inlet connecting the suction area to the outside and an oil outlet connecting the outlet area to the outside. The rotor is used to connect to an external power source. The rotor has a first type of groove and a second type of groove. The large blade is disposed in the first type of groove and can slide radially along the rotor as it rotates. The small blade is detachably connected in the second type of groove, and the bottom of the small blade contacts the lower distribution plate.

2. The hydraulic fluid wear resistance testing unit according to claim 1, characterized in that: It also includes a fixing bolt, and the side of the rotor is provided with a fixing screw hole that connects the second type of groove to the outside. The fixing bolt is screwed into the fixing screw hole and abuts against the side of the small blade. The assembly method between the large blade and the first type of groove is a clearance fit.

3. The hydraulic fluid wear resistance testing unit according to claim 1, characterized in that: It also includes an axial fastener, which is fixedly installed in the second type of groove and located at the top of the small blade. The small blade and the second type of groove are assembled by an interference fit, and the bottom of the axial fastener contacts the top of the small blade.

4. The hydraulic fluid wear resistance testing unit according to claim 1, characterized in that: The first type of groove and the second type of groove are evenly spaced along the circumference of the rotor and the number of the first type of groove and the second type of groove are equal. Each first type of groove is provided with a large blade and each second type of groove is provided with a small blade.

5. The hydraulic fluid wear resistance testing unit according to claim 1, characterized in that: It also includes tenoned bolts, which pass through the upper oil distribution plate, the stator and the lower oil distribution plate and fix the upper oil distribution plate, the stator and the lower oil distribution plate together.

6. The hydraulic fluid wear resistance testing unit according to claim 1, characterized in that: The outer casing includes an upper cover and a base. The lower end of the upper cover is detachably connected to the upper end of the base. The oil inlet is located on the base, and the oil outlet is located on the upper cover. The lower end of the base is used to connect to a hydraulic lifting platform.

7. The hydraulic fluid wear resistance testing unit according to claim 6, characterized in that: It also includes a drive shaft. The upper cover and the upper oil distribution plate are provided with mounting through holes. One end of the drive shaft passes through the two mounting through holes and is detachably connected to the rotor through a drive positioning pin. The drive shaft is coaxial with the rotor and is used to connect to power equipment.

8. The hydraulic fluid wear resistance testing unit according to claim 6, characterized in that: The upper side of the base is provided with a mounting groove, and the lower oil distribution plate is detachably fixedly connected in the mounting groove. The side wall of the lower oil distribution plate is in contact with the side wall of the mounting groove. There is a gap between the bottom of the lower oil distribution plate and the inner bottom surface of the mounting groove. The oil suction area is formed between the lower oil distribution plate and the inner bottom surface of the mounting groove.

9. The hydraulic fluid wear resistance testing unit according to claim 6, characterized in that: It also includes a lower positioning pin. The lower oil distribution plate is provided with a vertical first insertion hole. The axis of the first insertion hole is spaced apart from the central axis of the lower oil distribution plate. The base is provided with a second insertion hole that communicates with the first insertion hole. The lower positioning pin is inserted into the first insertion hole and the second insertion hole.

10. The hydraulic fluid wear resistance testing unit according to claim 6, characterized in that: It also includes connecting bolts. The base is provided with connecting through holes that connect both sides of the base. The lower end face of the upper cover is provided with mounting screw holes corresponding to the positions of the connecting through holes. The connecting bolts pass through the connecting through holes and are threaded into the mounting screw holes.

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