A multifunctional oil pump testing and calibration device

Abstract

The present invention discloses a multifunctional oil pump testing and calibration device, which includes an oil tank, a pump body to be tested, a drive mechanism, a first test oil circuit, and a second test oil circuit. The pump body to be tested is connected to the oil tank and the drive mechanism, so that the drive mechanism drives the pump body to be tested to draw oil from the oil tank. The first test oil circuit and the second test oil circuit each form a loop with the oil tank, and both the first test oil circuit and the second test oil circuit are connected to the pump body to be tested and pass through the pump body to be tested. The present invention is a test device that can simulate the actual operating oil conditions of the oil pump and thereby test the performance of the oil pump.

Description

Technical Field

[0001] The present invention relates to the technical field of pump detection equipment, and in particular to a multifunctional testing and calibration device for an oil pump. Background Art

[0002] Currently, the function of oil pumps on the market is to raise engine oil to a certain pressure and then force it onto the moving surfaces of engine and transmission components. Oil pumps are classified into two types: gear and rotor. After production, these pumps are installed in various engines and large components. Failure to meet these requirements can lead to serious consequences, such as malfunctioning engines. To prevent this, oil pumps undergo simulated engine control tests before leaving the factory. With increasing national demands for energy conservation and emission reduction, existing pumps that simply provide lubrication and cooling are no longer sufficient. Based on actual engine power requirements, major automakers are also increasing their demands, pushing oil pumps beyond lubrication and cooling. More OEMs are seeking to minimize power consumption without sacrificing lubrication and cooling. Consequently, various oil pump manufacturers are introducing variable displacement oil pumps and transmission oil pumps that adapt to these requirements, requiring them to provide varying lubrication and flow rates based on engine and transmission power consumption. In contrast, intelligently adjustable variable displacement oil pumps and transmission oil pumps have emerged. Corresponding oil pump post-production testing and calibration equipment is particularly important. This equipment can effectively simulate various motion conditions of the engine and transmission, and through testing and benchmarking, it can more realistically detect the performance of the oil pump and improve product quality and customer satisfaction.

[0003] While there are numerous oil pump test equipment available on the market, there is currently no equipment that can truly simulate all engine operating conditions for benchmarking. This significantly reduces the validity and authenticity of performance test data for variable displacement and transmission oil pumps. This equipment can more effectively and realistically simulate all engine and transmission operating conditions.

[0004] Generally, existing oil pump test equipment can only perform routine oil pump performance testing and verification. There is no clear method standard on how to benchmark engine and transmission test conditions, and there is no similar benchmarking equipment. Summary of the Invention

[0005] In view of the above problems existing in the prior art, the present invention aims to provide a test device that can simulate the actual operating oil condition of an oil pump and thereby detect the performance of the oil pump.

[0006] The specific technical solutions are as follows:

[0007] A multifunctional oil pump testing and calibration device includes an oil tank, a pump body to be tested, a driving mechanism, a first detection oil circuit and a second detection oil circuit. The pump body to be tested is connected to the oil tank and the driving mechanism, so that the driving mechanism drives the pump body to be tested to suck oil from the oil tank. A loop is formed between the first detection oil circuit, the second detection oil circuit and the oil tank, and the first detection oil circuit and the second detection oil circuit are both connected to the pump body to be tested and pass through the pump body to be tested.

[0008] Further optimization, the first detection oil circuit includes a main oil circuit, a lubricating oil circuit, a first pressure sensor, a second pressure sensor, a first valve group, a second valve group, a first flow resistor, a second flow resistor and a flow meter. The main oil circuit is connected to the oil tank and is connected in sequence to the pump body to be tested, the first pressure sensor, the first valve group, the first flow resistor, the second flow resistor, the second valve group and the flow meter, and finally returns to the oil tank to form a main oil circuit loop; the starting point of the lubricating oil circuit is located between the first flow resistor and the second flow resistor and is connected in sequence to the second pressure sensor and the pump body to be tested, and finally returns to the oil tank to form a lubricating oil circuit loop.

[0009] Further optimization, the second detection oil circuit includes an oil supply circuit, a lubrication branch circuit, a first proportional valve, a second proportional valve and a flow meter. The oil supply circuit is connected to the first pressure sensor and is sequentially connected to the first valve group, the first proportional valve, the second proportional valve and the flow meter, and finally returns to the oil tank to form an oil supply circuit loop; the starting point of the lubrication branch circuit is located between the first valve group and the first proportional valve and is sequentially connected to the second pressure sensor and the pump body to be tested, and finally returns to the oil tank to form a lubrication branch circuit.

[0010] After further optimization, the driving mechanism includes a bracket, a variable frequency motor, a torque sensor and a coupling. The variable frequency motor is fixed on the bracket, the output shaft of the variable frequency motor is connected to the torque sensor, and the output shaft of the variable frequency motor is connected to the main shaft of the pump body to be tested through a coupling.

[0011] After further optimization, the main oil circuit, lubricating oil circuit, oil delivery circuit and lubrication branch circuit are all pipelines.

[0012] Further optimization, the first flow resistor and the second flow resistor include a base and a sealing cover, the base has a first through hole that passes through the base, and the base also has a second through hole that is perpendicular to and communicates with the first through hole, the second through hole opening is facing upward, and the intersection of the first through hole and the second through hole is a limiting protrusion. When the pipes are installed from both ends of the first through hole and cooperate with the first through hole, the end faces of the two pipes just touch the outer side surface of the limiting protrusion, and a flow resistance block is detachably installed in the second through hole, and the two side surfaces of the flow resistance block touch the inner side surface of the limiting protrusion. The flow resistance block has a third through hole along the axial direction of the first through hole, and the third through hole is communicated with the first through hole. By controlling the aperture size of the third through hole, the amount of oil flowing through the flow resistance block is controlled, and the sealing cover is fixed above the base.

[0013] Further optimization, the second through hole is a square hole.

[0014] Further optimized, a protrusion extends downward from the bottom surface of the sealing cover. When the sealing cover is fixedly assembled above the base, the protrusion fits exactly into the second through hole and the bottom of the protrusion abuts against the upper surface of the flow resistance block.

[0015] Further optimization is carried out, the upper surface of the flow resistance block is an arc surface, and a threaded countersunk hole is opened in the middle position of the arc surface.

[0016] The positive effects of the above technical solution are:

[0017] (1) This equipment is equipped with two detection oil circuits: the first detection oil circuit simulates the speed change state of the engine and gearbox, that is, through the different oil volumes of the flow resistance block, it simulates the different oil volume working conditions when the oil pump engine and gearbox are shifting. This detection oil circuit is particularly suitable for variable displacement oil pumps; the second detection oil circuit simulates the no-load state of the oil pump engine and gearbox, and simulates the idle working conditions of the oil pump engine and gearbox through the control of the proportional valve and the oil volume monitoring of the flow meter. The two detection oil circuits can be operated simultaneously or separately to meet different test needs.

[0018] (2) By setting flow resistors of different apertures on the oil pipeline, the amount of oil flowing to the oil pump to be tested can be controlled and adjusted, and the oil circuit working conditions of the oil pump can be realistically reproduced and simulated, thereby achieving accurate testing of the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall structural diagram of the present invention.

[0020] Figure 2 This is a schematic diagram of the oil circuit detection of the present invention.

[0021] Figure 3 This is a structural diagram of the flow resistance block of the present invention.

[0022] Figure 4 This is a cross-sectional view of the flow resistance block of the present invention.

[0023] Among them, 1. oil tank; 2. pump body to be tested; 3. driving mechanism; 30. bracket; 31. frequency conversion motor; 32. torque sensor; 33. coupling; 4. first detection oil circuit; 40. main oil circuit; 41. lubricating oil circuit; 42. first pressure sensor; 43. second pressure sensor; 44. first valve group; 45. second valve group; 46. first flow resistor; 47. second flow resistor; 48. flow meter; 5. second detection oil circuit; 50. oil delivery circuit; 51. lubrication branch; 52. first proportional valve; 53. second proportional valve; 6. base; 7. sealing cover; 8. first through hole; 9. second through hole; 10. third through hole; 11. limiting protrusion; 12. flow resistance block; 13. protrusion. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the following embodiments are combined with the accompanying drawings to specifically illustrate the present invention.

[0025] The present invention discloses a multifunctional oil pump test and calibration device, such as Figure 1 As shown, it includes an oil tank 1, a pump body to be tested 2, a driving mechanism 3, a first detection oil circuit 4 and a second detection oil circuit 5. The pump body to be tested is connected to the oil tank 1 and the driving mechanism 3, so that the driving mechanism 3 drives the pump body to be tested 2 to absorb oil from the oil tank 1. Therefore, the oil tank 1 supplies oil to the pump body to be tested 2. A loop is formed between the first detection oil circuit 4 and the second detection oil circuit 5 and the oil tank 1. The first detection oil circuit 4 and the second detection oil circuit 5 are both connected to the pump body to be tested and pass through the pump body to be tested to detect data such as flow rate and pressure of the oil absorbed by the pump body to be tested, and then judge whether the pump body to be tested 2 is qualified based on the detection data.

[0026] like Figure 2 As shown, the first detection oil circuit 4 includes a main oil circuit 40, a lubricating oil circuit 41, a first pressure sensor 42, a second pressure sensor 43, a first valve group 44, a second valve group 45, a third valve group, a first flow resistor 46, a second flow resistor 47 and a flow meter 48. The main oil circuit 40 is connected to the oil tank 1 and is sequentially connected to the pump body 2 to be tested, the first pressure sensor 42, the first valve group 44, the first flow resistor 46, the second flow resistor 47, the second valve group 45 and the flow meter 48, and finally returns to the oil tank 1 to form a main oil circuit 40 loop; the starting point of the lubricating oil circuit 41 is located between the first flow resistor 46 and the second flow resistor 47 and is sequentially connected to the second pressure sensor 43 and the pump body 2 to be tested, and finally returns to the oil tank 1 to form a lubricating oil circuit 41 loop. The operating process is as follows: the pump body 2 under test draws oil through the drive mechanism 3. The oil flows along the main oil path 40 through the first pressure sensor 42, which collects pressure data. The first valve group 44 then opens, and the oil passing through the first valve group 44 passes through the first flow resistor 46. The oil exiting the first flow resistor 46 is divided into two oil paths: one path serves as the lubricating oil path 41 of the oil pump under test, passing through the second valve group 45 and the second pressure sensor 43, which collects pressure data from the lubricating oil path 41. The oil in the lubricating oil path 41 is then returned to the oil pump under test. The other path continues as the main oil path 40, passing through the second flow resistor 47 and the third valve group, then flowing through the flow meter 48 for flow measurement, before finally returning to the oil tank 1. Therefore, due to the different apertures of the first and second flow resistors 46, the amount of oil flowing through them is also different. By controlling the aperture size of the flow resistors, the oil volume during the speed change of the oil pump under test can be simulated.

[0027] The second detection oil circuit 5 includes an oil supply circuit 50, a lubrication branch circuit 51, a first proportional valve 52, a second proportional valve 53 and a flow meter 48. The oil supply circuit 50 is connected to the first pressure sensor 42 and is sequentially connected to the first valve group 44, the first proportional valve 52, the second proportional valve 53 and the flow meter 48, and finally returns to the oil tank 1, forming an oil supply circuit 50 loop; the starting point of the lubrication branch circuit 51 is located between the first valve group 44 and the first proportional valve 52 and is sequentially connected to the second pressure sensor 43 and the pump body 2 to be tested, and finally returns to the oil tank 1, forming a lubrication branch circuit 51 loop. The operating process is as follows: the pump body 2 under test draws oil through the drive mechanism 3. The oil flows along the oil delivery line 50 through the first pressure sensor 42, which collects pressure data. The first valve group 44 then opens, and the oil passing through the first valve group 44 is divided into two oil paths: one serves as the lubrication branch 51 for the oil pump under test. The oil in the lubrication branch 51 flows through the second pressure sensor 43 and finally returns to the oil pump under test; the other serves as the oil delivery line 50, continuing the transportation, flowing through the first proportional valve 52 and the second proportional valve 53 in sequence, then through the flow meter 48 for flow measurement, and finally returns to the oil tank 1. The first proportional valve 52 and the second proportional valve 53 here select different flow rates according to the different models of the oil pump under test, that is, a fixed amount of oil when no load is applied.

[0028] The driving mechanism 3 includes a bracket 30, a variable frequency motor 31, a torque sensor 32 and a coupling 33. The variable frequency motor 31 is fixed on the bracket 30. The output shaft of the variable frequency motor 31 is connected to the torque sensor 32. The torque sensor 32 is used to detect the output torque. The output shaft of the variable frequency motor 31 is connected to the main shaft of the pump body 2 to be tested through the coupling 33.

[0029] It should be noted that the main oil circuit 40, the lubricating oil circuit 41, the oil delivery circuit 50 and the lubricating branch circuit 51 are all pipelines. The model, material, size and routing of the pipelines are not repeated here. In addition, each oil circuit, branch circuit is connected to the oil tank 1 for oil return and is equipped with a filter to filter oil impurities, ensure the quality of the oil, enable it to be recycled, and minimize the impact of the oil on the test data, thereby ensuring the accuracy and authenticity of the data.

[0030] The first flow resistor 46 and the second flow resistor 47 include a base 6 and a sealing cover 7, as shown in FIG. Figure 3As shown, the base 6 is provided with a first through hole 8 that passes through the base 6, and the base 6 is also provided with a second through hole 9 that is perpendicular to and communicates with the first through hole 8, the second through hole 9 is opened upward, and the intersection of the first through hole 8 and the second through hole 9 is a limiting protrusion 11. When the pipes are sleeved from both ends of the first through hole 8 and matched with the first through hole 8, the end faces of the two pipes just touch the outer side of the limiting protrusion 11, so the limiting protrusion 11 not only connects the two pipes but also limits the two pipes. A flow resistance block 12 is detachably sleeved in the second through hole 9, and the flow resistance block 12 is inserted or removed from the opening of the second through hole 9, that is, the flow resistance block 12 is placed in the second through hole 9 from top to bottom, and the flow resistance block 12 falls to the connection between the second through hole 9 and the first through hole 8 under the action of its own gravity, and the two side surfaces of the flow resistance block 12 touch the inner side surfaces of the limiting protrusion 11, as shown in FIG. Figure 4 As shown, the flow block 12 has a third through hole 10 axially extending from the first through hole 8. This third through hole 10 communicates with the first through hole 8, allowing oil to flow smoothly through it. Therefore, the amount of oil flowing through the flow block 12 is controlled by controlling the diameter of the third through hole 10. A sealing cover 7 is secured to the base 6 via fasteners, and a seal is provided between the contact surfaces of the sealing cover 7 and the base 6 to prevent oil leakage. The diameters of the third through holes 10 in the first and second flow resistors 46, 47 can be varied to suit different test conditions.

[0031] The second through hole 9 is a square hole, and accordingly, the flow resistance block 12 is also square-shaped, so that the flow resistance block 12 and the inner wall of the second through hole 9 are in plane-to-plane contact, which is different from the arc-shaped curved surface contact. The contact surface between the flow resistance block 12 and the inner wall of the second through hole 9 is increased to the greatest extent, thereby increasing the friction between the flow resistance block 12 and the inner wall of the second through hole 9 and increasing the stability of the flow resistance block 12.

[0032] A protrusion 13 extends downward from the bottom surface of the sealing cover 7. When the sealing cover 7 is fixedly assembled on the base 6, the protrusion 13 fits exactly into the second through hole 9 and the bottom of the protrusion 13 rests on the upper surface of the flow resistance block 12, which plays a role in suppressing the flow resistance block 12 and preventing the flow resistance block 12 from shaking under the push of oil, thereby forming a gap. The oil will accumulate in the gap for a long time, affecting the accuracy of the oil volume data and increasing the waste of oil.

[0033] like Figure 3 、 4 As shown, the upper surface of the flow resistance block 12 is an arc surface, and a threaded countersunk hole is opened in the middle position of the arc surface. The arc surface here can reduce the contact area between the flow resistance block 12 and the second through hole 9, which is convenient for the disassembly and installation of the flow resistance block 12. A threaded countersunk hole is opened in the middle position of the arc surface. Another screw or bolt with an external thread is used to make the screw or bolt match the countersunk hole, so that the flow resistance block 12 can be easily inserted into or removed from the second through hole 9.

[0034] The tests that can be performed by this equipment include: flow performance, start-up time, regulation pressure, regulation pressure hysteresis, valve group opening pressure, etc.

[0035] For example, when starting, install the oil pump on this equipment for testing under the specified test oil, oil temperature and test flow resistance conditions. Increase the oil pump from rest to the specified speed within the specified time, with a total running time of no less than 30 seconds. Measure and record the time from starting to establishing the specified pressure. This time is the starting time.

[0036] When adjusting pressure, under the specified test oil, oil temperature, test flow resistance, and valve group signal conditions, the oil pump is raised from a standstill to its maximum speed. After the speed stabilizes, the pump is then lowered to a standstill. Parameters such as the pump speed, pump outlet pressure, main oil line 40 pressure, and flow rate are measured and recorded. A curve is drawn showing the relationship between the speed and the main oil line 40 pressure. The pressure value after the inflection point of the main oil line 40 pressure curve is the pump adjustment pressure. Under the specified test oil, oil temperature, speed, test flow resistance, and valve group signal conditions, the valve group duty cycle is adjusted from 0% to 100% at the specified adjustment speed, and then adjusted to 0% at the same speed. The pump valve group duty cycle, pump outlet pressure, main oil line 40 pressure, and oil temperature are measured and recorded. A curve is drawn showing the relationship between the valve group duty cycle and the main oil line 40 pressure, and the maximum duty cycle difference under the same pressure conditions is calculated.

[0037] Under the conditions of specified test oil and oil temperature, increase the oil pump speed to 2000r / min. After the outlet pressure stabilizes for 10s, adjust the valve group opening at the pump outlet from 100% to 0%. Measure the pump outlet pressure, flow, oil temperature, etc., and record the measured values to obtain the relationship curve between the pump outlet pressure and flow. The pressure value corresponding to the inflection point of flow decline is the valve group opening pressure.

[0038] In addition, the flow resistance of this equipment is set according to the requirements of the actual working condition simulation. Before the test, the oil pump is installed on this equipment, and the oil pump speed is adjusted to make the flow rate reach the specified value. Under the condition of fixed flow rate, the main oil circuit 40 pipeline valve group is adjusted to make the main oil circuit 40 pipeline pressure reach the specified pressure value, and then the pump outlet valve group is adjusted to make the difference between the pump outlet pressure and the main oil circuit 40 pipeline pressure reach the required value of the test flow resistance. After the flow rate and pressure are stable, the opening of the pump outlet valve group and the main oil circuit 40 pipeline valve group are recorded.

[0039] In addition, it should be noted that the relevant data of the pressure sensor, flow meter 48, proportional valve and a series of valve groups are assumed to be centrally and intelligently processed by automated detection equipment, and no further details are given here.

[0040] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional oil pump test and calibration device, characterized in that: It comprises an oil tank (1), a pump body to be tested (2), a driving mechanism (3), a first detection oil circuit (4) and a second detection oil circuit (5); the pump body to be tested (2) is connected to the oil tank (1) and the driving mechanism (3), so that the driving mechanism (3) drives the pump body to be tested (2) to absorb oil from the oil tank (1); a loop is formed between the first detection oil circuit (4), the second detection oil circuit (5) and the oil tank (1); and the first detection oil circuit (4) and the second detection oil circuit (5) are both connected to the pump body to be tested (2) and pass through the pump body to be tested (2); The first detection oil circuit (4) comprises a main oil circuit (40), a lubricating oil circuit (41), a first pressure sensor (42), a second pressure sensor (43), a first valve group (44), a second valve group (45), a first flow resistor (46), a second flow resistor (47) and a flow meter (48). The main oil circuit (40) is connected to the oil tank (1) and is sequentially connected to the pump body (2) to be tested, the first pressure sensor (42), the first valve group (44), the first flow resistor (46), the second flow resistor (47), the second valve group (45) and the flow meter (48), and finally returns to the oil tank (1) to form a main oil circuit (40) loop. The starting point of the lubricating oil circuit (41) is located between the first flow resistor (46) and the second flow resistor (47) and is sequentially connected to the second pressure sensor (43) and the pump body (2) to be tested, and finally returns to the oil tank (1) to form a lubricating oil circuit (41) loop. The second detection oil circuit (5) comprises an oil delivery circuit (50), a lubrication branch circuit (51), a first proportional valve (52), a second proportional valve (53) and a flow meter (48). The oil delivery circuit (50) is connected to the first pressure sensor (42) and is sequentially connected to the first valve group (44), the first proportional valve (52), the second proportional valve (53) and the flow meter (48), and finally returns to the oil tank (1), forming an oil delivery circuit (50). The starting point of the lubrication branch circuit (51) is located between the first valve group (44) and the first proportional valve (52), and is sequentially connected to the second pressure sensor (43) and the pump body (2) to be tested, and finally returns to the oil tank (1), forming a lubrication branch circuit (51).

2. The multifunctional oil pump testing and calibration device according to claim 1, characterized in that: The driving mechanism (3) comprises a bracket (30), a variable frequency motor (31), a torque sensor (32) and a coupling (33). The variable frequency motor (31) is fixed on the bracket (30). The output shaft of the variable frequency motor (31) is connected to the torque sensor (32). The output shaft of the variable frequency motor (31) is connected to the main shaft of the pump body (2) to be tested through the coupling (33).

3. The multifunctional oil pump testing and calibration device according to claim 1, characterized in that: The main oil circuit (40), the lubricating oil circuit (41), the oil delivery circuit (50) and the lubricating branch circuit (51) are all pipelines.

4. The multifunctional oil pump testing and calibration device according to claim 1, characterized in that: The first flow resistor (46) and the second flow resistor (47) include a base (6) and a sealing cover (7). The base (6) is provided with a first through hole (8) penetrating the base (6). The base (6) is also provided with a second through hole (9) perpendicular to and intercommunicating with the first through hole (8). The second through hole (9) opens upward. The intersection of the first through hole (8) and the second through hole (9) is a limiting protrusion (11). When the pipe is sleeved from both ends of the first through hole (8) and matched with the first through hole (8), the end surfaces of the two pipes are Just against the outer side of the limiting protrusion (11), a flow resistance block (12) is detachably sleeved in the second through hole (9), and the two side surfaces of the flow resistance block (12) are against the inner side of the limiting protrusion (11). The flow resistance block (12) is provided with a third through hole (10) along the axial direction of the first through hole (8). The third through hole (10) is interconnected with the first through hole (8). By controlling the aperture size of the third through hole (10), the amount of oil flowing through the flow resistance block (12) is controlled. The sealing cover (7) is fixed above the base (6).

5. The multifunctional oil pump testing and calibration device according to claim 4, characterized in that: The second through hole (9) is a square hole.

6. The multifunctional oil pump testing and calibration device according to claim 4 or 5, characterized in that: A protrusion (13) extends downward from the bottom surface of the sealing cover (7). When the sealing cover (7) is fixedly assembled on the base (6), the protrusion (13) fits exactly into the second through hole (9) and the bottom of the protrusion (13) abuts against the upper surface of the flow resistance block (12).

7. The multifunctional oil pump testing and calibration device according to claim 4, characterized in that: The upper surface of the flow resistance block (12) is an arc surface, and a threaded countersunk hole is opened in the middle of the arc surface.

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