Graphite bearing durability testing device suitable for new energy automobile heat exchange system
By introducing the water tank circulation system and the water tank circulation system, counterweight module and cooling function graphite bearing durability testing device, the existing devices have low test accuracy and incomplete working conditions in the thermal management system of new energy vehicles, and more accurate low-temperature testing and multi-condition evaluation are achieved, supporting the research and development of graphite bearings.
Patent Information
- Application Number
- CN202422198342.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The existing graphite bearing durability test devices have problems such as low testing accuracy, incomplete simulation working conditions, poor media fit, limited pressure adjustment and limited temperature range when simulating the actual working environment of the thermal management system of new energy vehicles, especially under low temperature conditions.
A graphite bearing durability test device suitable for heat exchange systems of new energy vehicles was designed, and the upper water tank circulation system and the lower water tank circulation system were introduced. The wear load was adjusted through the counterweight module, the lifting and cooling function was increased, the coolant was used as the test medium, and the temperature and flow were accurately controlled through the Labview control software.
It achieves more accurate test results, and can evaluate the performance of graphite bearings under a variety of complex operating conditions, especially under low temperature conditions, which improves the comprehensiveness and accuracy of the test and provides more research points and data support.
Smart Images
Figure CN223138983U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of new energy vehicle thermal management, and specifically relates to a graphite bearing durability test device applicable to a new energy vehicle heat exchange system. Background Technique
[0002] As an important development direction of future transportation tools, new energy vehicles are receiving more and more attention and research. The new energy vehicle thermal management system includes a battery cooling system, a motor cooling system, an air conditioning system, an electronic device heat dissipation system, etc., and plays a key role in ensuring the safety, performance and lifespan of the vehicle. Due to its excellent self-lubricating performance, high temperature resistance, corrosion resistance and wear resistance, graphite bearings are currently gradually being applied to key components of these systems. The performance and durability of graphite bearings under complex working conditions such as high temperature, high pressure and high load are important factors to ensure the reliability of the system;
[0003] At present, the existing graphite bearing durability test devices on the market have some deficiencies in terms of test accuracy, simulated working conditions and data analysis, mainly manifested as follows:
[0004] 1. Low test accuracy: The existing test devices are difficult to accurately simulate the actual working environment in the new energy vehicle thermal management system, resulting in a large difference between the test results and the actual usage situation;
[0005] 2. Incomplete simulated working conditions: The existing devices usually can only simulate single or limited working conditions and cannot comprehensively evaluate the performance of graphite bearings under various complex working conditions;
[0006] At the same time, the existing test equipment in the industry is mainly a high temperature and high pressure graphite bearing wear device, which includes a test chamber, support columns are fixed at the bottom of the test chamber, a test cavity and a rotating shaft are arranged inside, the motor is fixed on the fixing plate between the support columns to drive the rotating shaft to rotate, and electric push rods are installed on both sides of the inner wall, and the driving end of the push rod is connected to a clamping frame to fix the graphite bearing;
[0007] However, there are still some defects in the high temperature and high pressure graphite bearing wear device in the prior art:
[0008] 1. The medium does not conform well to the vehicle working conditions: The existing graphite bearing wear test devices usually use water as the test medium, while the actual coolant used in new energy vehicles is a coolant (water-ethylene glycol mixture or other special coolants). Due to the difference in medium characteristics, the test results are not completely consistent with the actual application environment;
[0009] 2. Limited pressure regulation: The existing test devices are difficult to accurately control the pressure borne by the graphite bearing. Especially under low pressure conditions, a pressure load lower than the total weight of the motor and the connecting device cannot be achieved, and the performance of the graphite bearing under different pressures cannot be fully reflected;
[0010] 3. Limited temperature range: Most existing test devices can only conduct tests under normal and high temperature conditions and cannot be used for testing in low temperature environments, which limits the evaluation of the performance of graphite bearings under low temperature conditions;
[0011] In view of the above problems, the utility model provides a durability test device for graphite bearings applicable to the heat exchange system of new energy vehicles to solve the above problems. Summary of the Utility Model
[0012] In order to solve the above problems, the purpose of the present utility model is to provide a durability test device for graphite bearings applicable to the heat exchange system of new energy vehicles.
[0013] To solve the above technical problems, the present utility model adopts the following technical solutions: A durability test device for graphite bearings applicable to the heat exchange system of new energy vehicles, the test device includes a frame, an upper table surface, a lower table surface, a counterweight module, a motor wear module, an upper water tank circulation system and a lower water tank circulation system;
[0014] The upper table surface and the lower table surface are assembled on the frame, the counterweight module, the motor wear module and the upper water tank circulation system are assembled on the upper table surface, and the lower water tank circulation system is assembled on the lower table surface.
[0015] Preferably, the counterweight module includes a triangular support block, a fixed support column, a disc counterweight, a webbing main body, a webbing locking block, a pulley and a weight reduction block;
[0016] The triangular support block and the fixed support column are fixed on the upper table surface, the disc counterweight is slidably installed on the fixed support column, and after the weight reduction block moves down a certain extent through the webbing main body wound around the pulley, the webbing locking block locks the webbing main body and pulls up the weight reduction block below.
[0017] Preferably, the motor wear module includes a motor main body, a motor rotating shaft, a counter grinding boss, a base, a triangular counterweight and a trapezoidal support block;
[0018] The rotation speed of the motor main body is controlled by a frequency converter, one end of the drive shaft of the motor main body is fixedly connected to one end of the motor rotating shaft, and the counter grinding boss is fixedly installed at one end of the base.
[0019] Preferably, the upper water tank circulation system includes an upper water tank main body, an upper water tank inlet proportional valve, an upper water tank outlet proportional valve, a liquid level sensor and a first thermocouple;
[0020] The base is assembled on the upper water tank main body, the upper water tank main body is assembled on the upper table surface, the upper water tank inlet proportional valve and the upper water tank outlet proportional valve are assembled at one end of the upper water tank main body, and the liquid level sensor and the first thermocouple are assembled inside the upper water tank main body.
[0021] Preferably, the lower water tank circulation system includes a lower water tank main body, a lower water tank inlet valve, a lower water tank outlet valve, a lower water tank return valve, a lower water tank make-up water solenoid valve, a float ball, a water pump, a heating wire, a compressor, a liquid level observation window, a second thermocouple, and a make-up water tank;
[0022] The lower water tank main body, the compressor, and the make-up water tank are assembled on the lower workbench. The lower water tank inlet valve is assembled on the pipeline at one end of the lower water tank main body. The lower water tank outlet valve and the lower water tank make-up water solenoid valve are assembled on the pipeline at the other end of the lower water tank main body. The lower water tank return valve is assembled on the pipeline on one side of the lower water tank main body. The float ball, the heating wire, and the second thermocouple are assembled inside the lower water tank main body. The water pump is assembled on the compressor and is connected to the pipeline on the lower water tank outlet valve through a pipeline. The liquid level observation window is assembled on the pipeline on the other side of the lower water tank main body. The make-up water tank is connected to the pipeline of the lower water tank main body through a pipeline.
[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0024] 1. In the present utility model, by introducing an upper water tank circulation system and a lower water tank circulation system into the test device, a series of problems caused by the change of the medium from water to coolant are solved, such as uneven liquid temperature, change of concentration over time, and influence of fluidity on concentration, etc.;
[0025] 2. In the present utility model, by introducing a counterweight module, the influence of the self-weight of the motor main body and the connecting device on the minimum load of the graphite bearing wear is overcome, and the function of freely adjusting the wear test load is realized, thereby increasing more research points and test data, which plays a certain supporting role in the research and development of graphite bearings;
[0026] 3. In the present utility model, by adding a temperature rise and fall function on the basis of the upper water tank circulation system and the lower water tank circulation system, a compressor is introduced, the test temperature range of graphite bearing wear is expanded, the research working conditions of wear are increased, and the test scheme of low-temperature wear is realized. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0028] Figure 1 It is a schematic diagram of the overall structure of a graphite bearing durability test device applicable to a new energy vehicle heat exchange system of the present utility model.
[0029] Figure 2 This is a schematic structural diagram of the counterweight module of the present utility model.
[0030] Figure 3 This is a schematic structural diagram of the motor wear module of the present utility model.
[0031] Figure 4 This is a schematic structural diagram of the upper water tank circulation system of the present utility model.
[0032] Figure 5 This is a schematic structural diagram of the lower water tank circulation system of the present utility model.
[0033] In the figure: 10, frame; 20, upper tabletop; 30, lower tabletop; 1, counterweight module; 2, motor wear module; 3, upper water tank circulation system; 4, lower water tank circulation system; 11, triangular support block; 12, fixed support column; 13, disc counterweight; 14, main body of the webbing; 15, webbing locking block; 16, pulley; 17, weight reduction block; 21, motor main body; 22, motor rotating shaft; 23, rubbing convex platform; 24, base; 25, triangular counterweight; 26, trapezoidal support block; 31, upper water tank main body; 32, upper water tank inlet proportional valve; 33, upper water tank outlet proportional valve; 34, liquid level sensor; 35, first thermocouple; 41, lower water tank main body; 42, lower water tank inlet valve; 43, lower water tank outlet valve; 44, lower water tank return valve; 45, lower water tank make-up water solenoid valve; 46, float ball; 47, water pump; 48, heating wire; 49, compressor; 410, liquid level observation window; 411, second thermocouple; 412, make-up water tank. Specific embodiments
[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0035] Embodiment: As Figures 1-5 shown, the present utility model provides a graphite bearing durability test device applicable to a new energy vehicle heat exchange system. The test device includes a frame 10, an upper tabletop 20, a lower tabletop 30, a counterweight module 1, a motor wear module 2, an upper water tank circulation system 3, and a lower water tank circulation system 4;
[0036] The upper tabletop 20 and the lower tabletop 30 are assembled on the frame 10. The counterweight module 1, the motor wear module 2, and the upper water tank circulation system 3 are assembled on the upper tabletop 20, and the lower water tank circulation system 4 is assembled on the lower tabletop 30.
[0037] The counterweight module 1 includes a triangular support block 11, a fixed support column 12, a disc counterweight 13, a webbing main body 14, a webbing locking block 15, a pulley 16, and a weight reduction block 17;
[0038] The triangular support block 11 and the fixed support column 12 are fixed on the upper table surface 20. The upper table surface 20 supports the fixed support column 12, and the fixed support column 12 guides the triangular support block 11. The disc counterweight 13 is slidably installed on the fixed support column 12. After the weight reduction block 17 moves down a certain extent by the webbing main body 14 wound around the pulley 16, the webbing locking block 15 locks the webbing main body 14 and pulls up the lower weight reduction block 17 to play a role in weight reduction.
[0039] The motor wear module 2 includes a motor main body 21, a motor rotating shaft 22, a grinding convex platform 23, a base 24, a triangular counterweight 25, and a trapezoidal support block 26;
[0040] The rotation speed of the motor main body 21 is controlled by a frequency converter. One end of the drive shaft of the motor main body 21 is fixedly connected to the motor rotating shaft 22. After the motor main body 21 is started, the drive shaft of the motor main body 21 makes the motor rotating shaft 22 rotate, thereby driving the test product to rotate. The grinding convex platform 23 is fixedly installed at one end of the base 24.
[0041] The upper water tank circulation system 3 includes an upper water tank main body 31, an upper water tank inlet proportional valve 32, an upper water tank outlet proportional valve 33, a liquid level sensor 34, and a first thermocouple 35;
[0042] The base 24 is assembled on the upper water tank main body 31. With the setting of the grinding convex platform 23, a grinding test is carried out with the product. The upper water tank main body 31 is assembled on the upper table surface 20. The upper water tank inlet proportional valve 32 and the upper water tank outlet proportional valve 33 are assembled at one end of the upper water tank main body 31. The liquid level sensor 34 and the first thermocouple 35 are assembled inside the upper water tank main body 31.
[0043] The lower water tank circulation system 4 includes a lower water tank main body 41, a lower water tank inlet valve 42, a lower water tank outlet valve 43, a lower water tank return valve 44, a lower water tank makeup water solenoid valve 45, a float 46, a water pump 47, a heating wire 48, a compressor 49, a liquid level observation window 410, a second thermocouple 411, and a makeup water tank 412. The water pump 47 is a high and low temperature resistant circulating water pump;
[0044] The lower water tank main body 41, the compressor 49 and the supplementary water tank 412 are assembled on the lower tabletop 30. The lower water tank inlet valve 42 is assembled on the pipeline at one end of the lower water tank main body 41. The lower water tank outlet valve 43 and the lower water tank water replenishing solenoid valve 45 are assembled on the pipeline at the other end of the lower water tank main body 41. The lower water tank return valve 44 is assembled on the pipeline on one side of the lower water tank main body 41. The float ball 46, the heating wire 48 and the second thermocouple 411 are assembled inside the lower water tank main body 41. The water pump 47 is assembled on the compressor 49 and is connected to the pipeline on the lower water tank outlet valve 43 through a pipeline. The liquid level observation window 410 is assembled on the pipeline on the other side of the lower water tank main body 41. The supplementary water tank 412 is connected to the pipeline of the lower water tank main body 41 through a pipeline.
[0045] When the water pump 47 in the lower water tank main body 41 is turned on, the liquid level height of the upper water tank main body 31 is monitored through the liquid level sensor 34 and fed back to the external Labview control software. The Labview control software controls the PID to adjust the upper water tank inlet proportional valve 32 and the upper water tank outlet proportional valve 33 to keep the liquid level stable.
[0046] When the water pump 47 is running, the liquid in the lower water tank main body 41 is sent to the upper water tank main body 31 through the lower water tank outlet valve 43. The liquid in the upper water tank main body 31 and the return water of the water pump 47 return to the lower water tank main body 41 through the lower water tank inlet valve 42 and the lower water tank return valve 44 to keep a constant pressure and flow rate.
[0047] The heating wire 48 and the compressor 49 are controlled by the Labview control software. The heating wire 48 and the compressor 49 adjust the temperature of the liquid to control the rise and fall of the liquid temperature.
[0048] The float ball 46 monitors the liquid level height in the lower water tank main body 41. When the water level is seriously insufficient, an alarm is given. When the water level is on the low side, the lower water tank water replenishing solenoid valve 45 closes to supplement the coolant into the lower water tank main body 41.
[0049] Working principle: When performing the durability test operation of the graphite bearing, first measure the overall levelness of the upper tabletop 20, and adjust the four support feet under the frame 10 so that the upper tabletop 20 is kept level as a whole. Measure the levelness of the triangular support block 11 and the disc counterweight 13, and adjust the fixing screws to keep each part level;
[0050] Measure the perpendicularity of the motor main body 21 on the upper tabletop 20, and adjust the relative angle between the motor main body 21 and the upper tabletop 20 by adjusting the three separable triangular counterweights 25 to meet the test requirements;
[0051] The mounting base 24, the rubbing convex platform 23, the motor rotating shaft 22 and the graphite bearing to be tested. During the installation process, the screws of the base 24 and the rubbing convex platform 23 are slightly stressed. After the graphite bearing is fitted with the motor rotating shaft 22, lift the slidable load assembly supported by the trapezoidal support block 26 (the slidable load assembly consists of the motor main body 21, the motor rotating shaft 22, the triangular counterweight 25 and the disc counterweight 13, and can slide up and down to serve as the load for testing the graphite bearing), remove the trapezoidal support block 26, so that the graphite bearing is subjected to the self-weight load downward from the motor main body 21, the disc counterweight 13 and the connecting assembly. Since there are certain gaps in the connections between the upper water tank main body 31, the base 24 and the rubbing convex platform 23, the relative positions between them can be slightly adjusted to make the concentricity of the rubbing surfaces of the graphite bearing and the rubbing convex platform 23 highly consistent, and then lock each screw;
[0052] Lift the slidable load assembly, remove the graphite bearing, place the force sensor under the motor rotating shaft 22, measure the overall load condition, and increase or decrease the weight of the disc counterweight 13 according to the test conditions, or adjust the weight reduction block 17 to make the force value meet the test requirements;
[0053] During the test, the temperature rise and fall of the coolant, the stable circulation flow of the medium, automatic water replenishment, motor wear and program startup actions are as follows:
[0054] The temperature rise and fall of the coolant: Lift the slidable load assembly again, support it with the trapezoidal support block 26, remove the force sensor, add vehicle coolant (the coolant is dexcool) to the lower water tank main body 41 until the liquid level observation window 410 reaches the calibrated height. Operate the heating wire 48 and the compressor 49 in the lower water tank circulation system 4 to make the liquid in the lower water tank main body 41 rise and fall in temperature as required. The temperature of the liquid is monitored by the second thermocouple 411 of the lower water tank main body 41, and the working efficiency of the heating wire 48 and the compressor 49 is controlled by the PID adjustment of the Labview control software to accurately control the liquid temperature to reach the required test conditions and then remain stable;
[0055] The stable circulation flow of the medium: Turn on the water pump 47, and by adjusting the lower water tank inlet valve 42, the lower water tank outlet valve 43, the lower water tank return valve 44, as well as the upper water tank inlet proportional valve 32 and the upper water tank outlet proportional valve 33, make the coolant flow evenly after the temperature is constant. The liquid level in the upper water tank main body 31 is higher than the wear position and remains stable. Calibrate the positions of the upper water tank inlet proportional valve 32 and the upper water tank outlet proportional valve 33, and then program the valve angles of the upper water tank inlet proportional valve 32 and the upper water tank outlet proportional valve 33 to automatically adjust the valve size according to the feedback value of the liquid level sensor 34 after the coolant concentration changes and the fluidity changes, so as to keep the liquid level height unchanged;
[0056] Automatic water replenishment: According to the long-term test results, the changing trend of the coolant concentration over time is obtained. By pre-mixing a certain proportion of coolant in the water replenishment tank 412, the water replenishment pipeline is connected to the water replenishment tank 412. The overall water level loss is monitored by the float 46 of the lower water tank main body 41. After the water level drops by a certain height, the lower water tank water replenishment solenoid valve 45 closes, and a certain proportion of coolant enters the lower water tank main body 41, so that the overall coolant concentration remains unchanged;
[0057] Motor wear: Lift the slidable load assembly, fix the graphite bearing during the test on the mating surface of the motor rotating shaft 22, remove the trapezoidal support block 26, make the graphite bearing contact and fit with the rubbing boss 23, and under the self-weight pressure of the overall slidable load assembly, operate the motor main body 21 according to the test requirements for testing;
[0058] Program start-stop operation: The following setting operations can be performed in the Labview control software, adjusting the temperature, operating speed, and operating time, and monitoring the temperatures of the upper water tank main body 31 and the lower water tank main body 41 and the speed of the motor main body 21 to achieve an automatic work process. After a specified time of wear according to the test requirements, the motor main body 21 automatically stops running. Lift the trapezoidal support block 26, remove the graphite bearing, measure the height change with a micrometer, put the graphite bearing back, and then lower the trapezoidal support block 26 to reset the next round of wear test.
[0059] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these changes and modifications.
Claims
1. A graphite bearing durability test device applicable to the heat exchange system of new energy vehicles, characterized in that, The test device includes a frame (10), an upper tabletop (20), a lower tabletop (30), a counterweight module (1), a motor wear module (2), an upper water tank circulation system (3) and a lower water tank circulation system (4); The upper tabletop (20) and the lower tabletop (30) are assembled on the frame (10). The counterweight module (1), the motor wear module (2) and the upper water tank circulation system (3) are assembled on the upper tabletop (20), and the lower water tank circulation system (4) is assembled on the lower tabletop (30).
2. The graphite bearing durability test device for a new energy vehicle heat exchange system according to claim 1, characterized in that, The counterweight module (1) includes a triangular support block (11), a fixed support column (12), a disc counterweight block (13), a webbing main body (14), a webbing locking block (15), a pulley (16) and a weight reduction block (17); The triangular support block (11) and the fixed support column (12) are fixed on the upper tabletop (20). The disc counterweight block (13) is slidably installed on the fixed support column (12). After the weight reduction block (17) moves down a certain extent through the webbing main body (14) wound around the pulley (16), the webbing locking block (15) locks the webbing main body (14) and pulls up the lower weight reduction block (17).
3. The graphite bearing durability test device for a new energy vehicle heat exchange system according to claim 1, characterized in that, The motor wear module (2) includes a motor main body (21), a motor rotating shaft (22), a counter grinding boss (23), a base (24), a triangular counterweight block (25) and a trapezoidal support block (26); The rotation speed of the motor main body (21) is controlled by a frequency converter. One end of the drive shaft of the motor main body (21) is fixedly connected to the motor rotating shaft (22), and the counter grinding boss (23) is fixedly installed at one end of the base (24).
4. The graphite bearing durability test device for a new energy vehicle heat exchange system according to claim 3, wherein, The upper water tank circulation system (3) includes an upper water tank main body (31), an upper water tank inlet proportional valve (32), an upper water tank outlet proportional valve (33), a liquid level sensor (34) and a first thermocouple (35); The base (24) is assembled on the upper water tank main body (31). The upper water tank main body (31) is assembled on the upper tabletop (20). The upper water tank inlet proportional valve (32) and the upper water tank outlet proportional valve (33) are assembled at one end of the upper water tank main body (31), and the liquid level sensor (34) and the first thermocouple (35) are assembled inside the upper water tank main body (31).
5. The graphite bearing durability test device for a new energy vehicle heat exchange system according to claim 1, wherein The lower water tank circulation system (4) includes a lower water tank main body (41), a lower water tank inlet valve (42), a lower water tank outlet valve (43), a lower water tank return valve (44), a lower water tank makeup solenoid valve (45), a float (46), a water pump (47), a heating wire (48), a compressor (49), a liquid level observation window (410), a second thermocouple (411) and a makeup water tank (412); The lower water tank main body (41), the compressor (49) and the makeup water tank (412) are assembled on the lower tabletop (30). The lower water tank inlet valve (42) is assembled on the pipeline at one end of the lower water tank main body (41). The lower water tank outlet valve (43) and the lower water tank makeup water solenoid valve (45) are assembled on the pipeline at the other end of the lower water tank main body (41). The lower water tank return water valve (44) is assembled on the pipeline on one side of the lower water tank main body (41). The float ball (46), the heating wire (48) and the second thermocouple (411) are assembled inside the lower water tank main body (41). The water pump (47) is assembled on the compressor (49) and is connected to the pipeline on the lower water tank outlet valve (43) through a pipeline. The liquid level observation window (410) is assembled on the pipeline on the other side of the lower water tank main body (41). The makeup water tank (412) is connected to the pipeline of the lower water tank main body (41) through a pipeline.