Motor test box

Abstract

This utility model relates to a motor test box, comprising: a housing having a receiving cavity and a shaft extension hole, the shaft extension hole communicating with the receiving cavity, the housing forming a mounting hole wall around the shaft extension hole, the receiving cavity accommodating the motor under test, and the shaft extension hole through which the shaft of the motor under test passes; a bearing, disposed on the mounting hole wall, the bearing being fitted onto the shaft; and a sealing cover connected to the housing and sealing the shaft extension hole, the sealing cover located on the side of the bearing facing away from the receiving cavity, the sealing cover having a liquid seal hole, the sealing cover forming a sealing surface around the liquid seal hole, the sealing surface having a liquid seal annular groove located between the two ends of the sealing cover, the liquid seal hole through which the shaft of the motor under test passes, and the liquid seal annular groove used to store coolant flowing through the bearing to form a liquid seal between the sealing cover and the shaft. This utility model, by providing a liquid seal annular groove on the sealing cover to form a liquid seal between the sealing cover and the shaft, ensures the sealing effect of the motor test box while reducing frictional damage to the shaft and improving test accuracy.

Description

Technical Field

[0001] This utility model relates to the field of motor testing technology, and specifically to a motor testing box. Background Technology

[0002] With the gradual development of new energy vehicles, there are more and more models of motors and powertrains used in new energy vehicles, and the requirements for motor performance are getting higher and higher. In order to ensure the performance of individual motors, it is necessary to conduct performance tests on the motors.

[0003] In related technologies, a motor test box is used to test the motor. The motor is installed inside the test box, which has a shaft extension hole. The motor shaft extends from the shaft extension hole and connects to an external load (such as a gearbox). The motor shaft drives the external load. To ensure the airtightness of the test box, a seal (such as an oil seal and a sealing ring) is used to seal the shaft and the shaft extension hole. However, friction occurs between the seal and the shaft, resulting in kinetic energy loss in the shaft. In actual working scenarios, the motor and the gearbox are directly connected without a seal. Therefore, the test scenario in the test scenario has additional friction loss from the seal compared to the actual working scenario, which affects the test accuracy of the motor. Utility Model Content

[0004] The purpose of this utility model is to provide a motor test box to solve the problem in the prior art where a seal is provided between the motor and the test box, which causes frictional loss between the motor shaft and the seal, thus affecting the test accuracy.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A motor test box includes: a housing having a receiving cavity and a shaft extension hole, the shaft extension hole communicating with and penetrating the receiving cavity; the housing forming a mounting hole wall around the shaft extension hole; the receiving cavity for accommodating a motor under test; the shaft extension hole for the shaft of the motor under test to pass through; a bearing disposed in the mounting hole wall, the bearing adapted to be fitted onto the shaft; and a sealing cover connected to the housing and covering the shaft extension hole, the sealing cover located on the side of the bearing facing away from the receiving cavity; the sealing cover having a liquid seal hole; the sealing cover forming a sealing surface around the inner circumferential surface of the liquid seal hole; a liquid seal annular groove provided on the sealing surface; the liquid seal annular groove located between the axial ends of the sealing cover; the liquid seal hole adapted for the shaft of the motor under test to pass through; and the liquid seal annular groove for storing coolant flowing through the bearing to form a liquid seal between the sealing cover and the shaft.

[0007] According to the above-mentioned technical means, in this utility model, when the motor under test is running, the coolant flows to the bearing to cool and lubricate it. Part of the coolant flowing through the bearing will flow to the bottom of the receiving cavity under the action of gravity, and the other part of the coolant flowing through the bearing will flow along the gap between the inner circumferential surface of the shaft and the shaft protrusion hole to the sealing cover. The coolant flows into the liquid seal ring groove, and the shaft and the coolant in the liquid seal ring groove form a liquid seal fit. The gap between the inner circumferential surface of the shaft and the liquid seal hole is sealed by the liquid seal, which prevents the coolant from leaking from the motor test box. The sealing element between the shaft and the sealing cover in the prior art is eliminated, which not only reduces the number of parts, simplifies the structure, and reduces the cost, but also reduces the friction force on the shaft during rotation, thereby reducing the kinetic energy loss of the shaft. The test scenario of the motor test box is closer to the actual use scenario, which can improve the accuracy of the motor test box in testing the motor under test.

[0008] Furthermore, there are multiple liquid seal annular grooves, which are arranged at intervals along the axial direction of the liquid seal hole.

[0009] Based on the above technical means, each liquid seal annular groove can store coolant, and multiple liquid seal structures can be formed between the inner circumferential surface of the rotating shaft and the liquid seal hole, thereby improving the sealing effect.

[0010] Furthermore, the housing has a placement bottom surface, and the inner sidewall of the housing has a protrusion that protrudes toward the receiving cavity. The shaft extension hole passes through the protrusion, and the protrusion has a drain groove that communicates with the shaft extension hole and is located on the side of the bearing facing the placement bottom surface.

[0011] According to the above-mentioned technical means, the coolant passing through the bearing can flow to the bottom of the receiving cavity through the drain groove, and will not accumulate between the bearing and the shaft protrusion hole, thereby reducing the flow of coolant to the sealing cover, reducing the probability of coolant leakage, and improving sealing performance.

[0012] Furthermore, the shaft extension hole includes: a bearing hole section, in which the bearing is disposed, and the drain groove communicates with the bearing hole section; a sealing hole section, located on the side of the bearing hole section facing the sealing cover, the inner diameter of the sealing hole section being smaller than the inner diameter of the bearing hole section; and a positioning hole section, located on the side of the sealing hole section away from the bearing hole section, the inner diameter of the sealing hole section being smaller than the inner diameter of the positioning hole section; the sealing cover includes an insertion section and a positioning section, the insertion section being inserted into the sealing hole section and having an interference fit with the sealing hole section, the positioning section being connected to the end of the insertion section away from the bearing, the outer diameter of the positioning section being larger than the outer diameter of the insertion section, and the positioning section being located within the positioning hole section.

[0013] Based on the above technical means, the sealing fit between the plug section and the sealing hole section can reduce the probability of coolant leakage between the sealing cover and the housing, and can determine the maximum depth of the plug section inserted into the sealing hole section, avoiding excessive insertion of the plug section into the sealing hole section and interference with the bearing, thus ensuring assembly efficiency and reliability.

[0014] Furthermore, the motor test box also includes a rotor liquid inlet, disposed in the housing, the rotor liquid inlet and the sealing cover are located on opposite sides of the receiving cavity, and the rotor liquid inlet is used to communicate with the hollow flow channel inside the rotating shaft.

[0015] Based on the above technical means, heat dissipation can be achieved for the stator windings and bearings of the motor test box, and the lubrication effect on the bearings can be reduced, thereby reducing the rotational resistance of the shaft, ensuring the reliability of the working performance of the motor under test, and improving the accuracy of the test results.

[0016] Furthermore, the housing is provided with a placement bottom surface, and a stator liquid inlet is provided on one side wall of the housing away from the placement bottom surface. The stator liquid inlet penetrates the housing and communicates with the receiving cavity.

[0017] Based on the above technical means, heat can be dissipated from the electronic stator components inside the motor test box, ensuring the reliability of the working performance of the motor under test and improving the accuracy of the test results.

[0018] Furthermore, the housing is provided with a partition wall in the receiving cavity, which divides the receiving cavity into a liquid storage cavity and a motor cavity. The partition wall is provided with a liquid passage hole, which communicates with the liquid storage cavity and the motor cavity. The liquid storage cavity is used to collect the coolant in the motor cavity.

[0019] Based on the above technical means, it is possible to prevent the coolant from accumulating in the containment cavity, avoid interference between the coolant in the containment cavity and the rotor assembly, reduce the probability of the rotor assembly agitating the coolant, reduce the rotational loss of the shaft, and improve the accuracy of the test.

[0020] Furthermore, the housing is provided with a return port, and the return port is connected to the liquid storage chamber. The return port is used to connect to an external liquid storage device.

[0021] The above-mentioned technical means can not only realize the circulation of coolant, but also make the operation convenient.

[0022] Furthermore, the housing is provided with an observation port, which is connected to the motor cavity; the motor test box also includes a transparent observation window, which is connected to the housing and covers the observation port.

[0023] Based on the above technical means, the liquid level of the coolant in the containment cavity can be checked in real time. If the liquid level reaches the preset liquid level line, the amount of coolant entering the cavity needs to be controlled, thereby effectively preventing the rotor assembly from agitating the coolant, reducing kinetic energy loss, and improving the accuracy of motor performance testing.

[0024] Furthermore, the housing includes: a housing body having a receiving cavity, a first opening, and a second opening, the first opening and the second opening communicating with the receiving cavity and located at opposite axial ends of the receiving cavity; a first end cap connected to the housing body and sealing the first opening, the shaft protrusion hole being provided in the first end cap, the bearing and the sealing cap being connected to the first end cap; and a second end cap connected to the housing body and sealing the second opening, the rotor liquid inlet being connected to the second end cap.

[0025] According to the above technical means, the housing is divided into three parts, each of which is easier to process. The motor under test can be installed into the receiving cavity through the first opening or the second opening, and can be taken out of the receiving cavity through the first opening or the second opening, making it convenient to pick up and put down the motor under test.

[0026] The beneficial effects of this utility model are:

[0027] (1) In this utility model, when the motor under test is running, the coolant flows to the bearing to cool and lubricate the bearing. Part of the coolant flowing through the bearing will flow to the bottom of the cavity under the action of gravity. The other part of the coolant flowing through the bearing will flow to the sealing cover along the gap between the inner circumferential surface of the shaft and the shaft protrusion hole. The coolant flows into the liquid seal ring groove. The shaft and the coolant in the liquid seal ring groove form a liquid seal fit. The gap between the inner circumferential surface of the shaft and the liquid seal hole is sealed by liquid seal, which prevents the coolant from leaking from the motor test box. The sealing element between the shaft and the sealing cover in the prior art is eliminated. This not only reduces the number of parts, but also simplifies the structure and reduces the cost. It also reduces the friction force on the shaft during rotation, thereby reducing the kinetic energy loss of the shaft. The test scenario of the motor test box is closer to the actual use scenario, which can improve the accuracy of the motor test box in testing the motor under test.

[0028] (2) Each liquid seal ring groove can store coolant, and multiple liquid seal structures can be formed between the inner circumferential surface of the shaft and the liquid seal hole to improve the sealing effect.

[0029] (3) The coolant passing through the bearing can flow to the lower part of the receiving cavity through the drain groove, and will not accumulate between the bearing and the shaft protrusion hole, reducing the flow rate of coolant to the sealing cover, reducing the probability of coolant leakage, and improving the sealing performance.

[0030] (4) The sealing fit between the plug section and the sealing hole section can reduce the probability of coolant leakage between the sealing cover and the housing, and can determine the maximum depth of the plug section inserted into the sealing hole section, avoiding excessive insertion of the plug section into the sealing hole section and interference with the bearing, thus ensuring assembly efficiency and reliability.

[0031] (5) It can dissipate heat from the stator windings and bearings of the motor test box, and can reduce the lubrication effect on the bearings, reduce the rotational resistance of the shaft, ensure the reliability of the working performance of the motor under test, and improve the accuracy of the test results.

[0032] (6) It can dissipate heat from the stator components of the electronic components in the motor test box, ensuring the reliability of the working performance of the motor under test and improving the accuracy of the test results.

[0033] (7) It can prevent coolant buildup in the containment cavity, avoid interference between coolant in the containment cavity and rotor assembly, reduce the probability of rotor assembly stirring coolant, reduce shaft rotation loss, and improve test accuracy.

[0034] (8) It can not only achieve the circulation of coolant, but also is easy to operate.

[0035] (9) It can check the liquid level of the coolant in the cavity in real time and observe whether the liquid level of the coolant has reached the preset liquid level line. If so, it is necessary to control the amount of coolant entering the cavity, thereby effectively avoiding the rotor assembly from stirring the coolant, reducing kinetic energy loss, and improving the accuracy of motor performance testing.

[0036] (10) The housing is divided into three parts, each of which is easier to process. The motor under test can be installed into the receiving cavity through the first opening or the second opening, and can be taken out of the receiving cavity through the first opening or the second opening. The motor under test is easy to pick up and put down. Attached Figure Description

[0037] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is a cross-sectional view of the motor test box and the motor after they are assembled according to this utility model. The dashed arrows are schematic diagrams of the flow path of the coolant flowing from the rotor inlet into the motor test box.

[0039] Figure 2This is a cross-sectional view of the motor test box body and the motor stator of this utility model after they are assembled. The dashed arrows are schematic diagrams of the flow path of the coolant flowing into the motor test box from the stator inlet.

[0040] Figure 3 This is a schematic diagram of the structure of the motor test box of this utility model;

[0041] Figure 4 This is a schematic diagram of the sealing cap of this utility model;

[0042] Figure 5 This is a cross-sectional view of the sealing cap of this utility model;

[0043] Figure 6 This is a schematic diagram of the structure of the first end cap of this utility model.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Motor test box; 2. Motor; 21. Stator assembly; 21a. Stator core; 21b. Stator winding; 22. Rotor assembly; 23. Shaft; 23a. Hollow flow channel; 23b. Spray hole; 100. Housing; 110. Housing body; 111. Receiving cavity; 112. First opening; 113. Second opening; 114. Stator liquid inlet; 115. Liquid passage hole; 116. Observation port; 120. First end cover; 121. Shaft extension hole; 121 1. Bearing bore section; 1212. Sealing bore section; 1213. Positioning bore section; 130. Second end cap; 140. Drain groove; 150. Liquid storage chamber; 160. Return port; 170. Protrusion; 180. Placement bottom surface; 190. Partition wall; 191. Motor cavity; 200. Bearing; 300. Sealing cap; 301. Liquid seal hole; 302. Liquid seal ring groove; 310. Insertion section; 320. Positioning section; 400. Rotor liquid inlet; 500. Transparent observation window. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0047] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0048] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0049] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0050] According to an embodiment of the present invention, a motor test box 1 is provided, which includes a housing 100, a bearing 200 and a sealing cover 300.

[0051] The housing 100 has a receiving cavity 111 and a shaft extension hole 121. The shaft extension hole 121 is connected to the receiving cavity 111 and extends through the housing 100, meaning that the shaft extension hole 121 communicates with the space outside the housing 100. The housing 100 forms a mounting hole wall around the shaft extension hole 121. The receiving cavity 111 is used to receive the motor 2 under test, and the shaft extension hole 121 is used for the rotating shaft 23 of the motor 2 under test to pass through. The bearing 200 is provided in the mounting hole wall, that is, the bearing 200 is provided on the inner circumferential surface of the shaft extension hole 121, and the bearing 200 is suitable for being sleeved on the rotating shaft 23. The sealing cover 300 is connected to the housing 100 and covers the shaft protrusion hole 121. The sealing cover 300 is located on the side of the bearing 200 facing away from the receiving cavity 111. The sealing cover 300 has a liquid seal hole 301, and the sealing cover 300 forms a sealing surface around the liquid seal hole 301. The sealing surface has a liquid seal annular groove 302, that is, the inner circumferential surface of the liquid seal hole 301 has a liquid seal annular groove 302. The liquid seal annular groove 302 is located between the two axial ends of the sealing cover 300. The liquid seal hole 301 is suitable for the shaft 23 of the motor 2 under test to pass through. The liquid seal annular groove 302 is used to store the coolant flowing through the bearing 200 to form a liquid seal between the sealing cover 300 and the shaft 23. The coolant can be a liquid with cooling function such as oil.

[0052] For example, the cross-sectional shape of the liquid seal annular groove 302 can be semi-circular, square, rectangular, trapezoidal, etc. The liquid seal hole 301 and the rotating shaft 23 are clearance fit. The motor under test 2 includes a stator assembly 21 and a rotor assembly 22. The central axis of the stator assembly 21 is aligned with the central axis of the rotor assembly 22. The stator assembly 21 includes a stator core 21a and a stator winding 21b. The stator winding 21b is located inside the stator core 21a and both ends of the stator winding 21b extend from both ends of the stator core 21a. The stator assembly 21 is fitted onto the rotor assembly 22. The rotor assembly 22 includes a rotating shaft 23. The rotating shaft 23 extends from the shaft extension hole 121 to the outside of the motor test box 1. The rotating shaft 23 is connected to a load (e.g., a gearbox) outside the motor test box 1. The rotating shaft 23 drives the load to work. The motor test box 1 supports the rotating shaft 23 through a bearing 200.

[0053] In this invention, when the motor under test 2 is running, the coolant flows to the bearing 200 to cool and lubricate it. Part of the coolant flowing through the bearing 200 will flow to the bottom of the receiving cavity 111 under the action of gravity, while the other part of the coolant flowing through the bearing 200 will flow along the gap between the inner circumferential surface of the shaft 23 and the shaft extension hole 121 to the sealing cover 300. The coolant flows into the liquid seal ring groove 302, and the shaft 23 and the coolant in the liquid seal ring groove 302 form a liquid seal fit. The gap between the inner circumferential surface of the shaft 23 and the liquid seal hole 301 is sealed by the liquid seal, preventing the coolant from leaking from the motor test box 1. The seal between the shaft 23 and the sealing cover 300 in the prior art is eliminated, which not only reduces the number of parts, simplifies the structure, and lowers the cost, but also reduces the friction force on the shaft 23 during rotation, thereby reducing the kinetic energy loss of the shaft 23. The test scenario of the motor test box 1 is closer to the actual use scenario, which can improve the accuracy of the motor test box 1 in testing the motor under test 2.

[0054] Furthermore, as on the right Figure 4 and Figure 5 As shown, there are multiple liquid seal annular grooves 302, which are arranged at intervals along the axial direction of the liquid seal hole 301. In this way, each liquid seal annular groove 302 can store coolant, and multiple liquid seal structures can be formed between the rotating shaft 23 and the inner circumferential surface of the liquid seal hole 301, thereby improving the sealing effect.

[0055] Specifically, the depth of the liquid seal annular groove 302 can be 1mm~2mm, the width of the liquid seal hole 301 can be 1mm~2mm, and the thickness of the sealing cap 300 can be 15mm~20mm. This ensures that the depth of the liquid seal annular groove 302 is no greater than 2mm, the width of the liquid seal hole 301 is no less than 1mm, the liquid seal annular groove 302 is easy to process, and the storage of coolant is sufficient, forming a reliable liquid seal structure between the rotating shaft 23 and the inner circumferential surface of the liquid seal hole 301, resulting in good sealing performance. The thickness of the sealing cap 300 is no less than 15mm, allowing for the formation of sufficiently long liquid seal holes 301 to create a sufficient number of liquid seal annular grooves 302, for example, 3 to 5. The thickness of the sealing cap 300 is no greater than 20mm, reducing cost and weight.

[0056] In some embodiments, such as Figure 1 As shown, the housing 100 has a placement bottom surface 180, and the inner sidewall of the housing 100 has a protrusion 170 protruding into the receiving cavity 111. The shaft extension hole 121 passes through the protrusion 170, and the protrusion 170 has a drain groove 140 communicating with the shaft extension hole 121. The drain groove 140 is located on the side of the bearing 200 facing the placement bottom surface 180, that is, the drain groove 140 is located below the bearing 200. The circumferential dimension of the drain groove 140 along the shaft extension hole 121 can be 20mm-30mm, and the circumferential dimension of the drain groove 140 along the shaft extension hole 121 can remain unchanged in the axial direction of the shaft extension hole 121.

[0057] In this way, the coolant passing through the bearing 200 can flow through the drain groove 140 to the lower part of the receiving cavity 111, and will not accumulate between the bearing 200 and the shaft extension hole 121, reducing the flow rate of coolant to the sealing cover 300, reducing the probability of coolant leakage, and improving sealing performance.

[0058] Furthermore, the shaft extension hole 121 includes a bearing hole section 1211, a sealing hole section 1212, and a positioning hole section 1213. The bearing hole section 1211, the sealing hole section 1212, and the positioning hole section 1213 are connected sequentially along the axial direction of the shaft extension hole 121. The bearing 200 is disposed in the bearing hole section 1211 and abuts against the end wall of the end where the bearing hole section 1211 and the sealing hole section 1212 are connected. The drain groove 140 communicates with the bearing hole section 1211, and the dimension of the drain groove 140 along the axial direction of the shaft extension hole 121 is the same as the dimension of the bearing hole section 1211 along the axial direction of the shaft extension hole 121.

[0059] A sealing hole section 1212 is located on the side of the bearing hole section 1211 facing the sealing cover 300, and the inner diameter of the sealing hole section 1212 is smaller than the inner diameter of the bearing hole section 1211. A positioning hole section 1213 is located on the side of the sealing hole section 1212 away from the bearing hole section 1211, and the inner diameter of the sealing hole section 1212 is smaller than the inner diameter of the positioning hole section 1213. The sealing cover 300 includes an insertion section 310 and a positioning section 320. The insertion section 310 is inserted into the sealing hole section 1212, and the insertion section 310 and the sealing hole section 1212 are interference-fitted to ensure a sealing fit between the insertion section 310 and the sealing hole section 1212, thereby reducing the probability of coolant leakage between the sealing cover 300 and the housing 100.

[0060] The positioning section 320 is connected to the insertion section 310 at one end away from the bearing 200. The outer diameter of the positioning section 320 is larger than the outer diameter of the insertion section 310. The positioning section 320 is located inside the positioning hole section 1213 and abuts against the end wall of the end where the positioning hole section 1213 and the sealing hole section 1212 are connected.

[0061] In this way, the maximum depth to which the insertion section 310 is inserted into the sealing hole section 1212 can be determined, avoiding excessive insertion of the insertion section 310 into the sealing hole section 1212 and interference with the bearing 200, thus ensuring assembly efficiency and reliability.

[0062] For example, the outer diameter of the positioning section 320 can be 50mm, and the positioning section 320 can be provided with 4 mounting holes. 4 M6 bolts pass through the 4 mounting holes and are fixed to the end wall of the end where the positioning hole section 1213 and the sealing hole section 1212 are connected, which further increases the connection reliability between the sealing cover 300 and the housing 100.

[0063] In some embodiments, such as Figure 1 and Figure 2 As shown, the housing 100 includes a housing body 110, a first end cap 120, and a second end cap 130. The housing body 110 is provided with a receiving cavity 111, a first opening 112, and a second opening 113. The first opening 112 and the second opening 113 are both connected to the receiving cavity 111, and the first opening 112 and the second opening 113 are located on opposite sides of the receiving cavity 111.

[0064] The first end cap 120 is connected to the shell body 110 and covers the first opening 112. The first end cap 120 is provided with a shaft protrusion hole 121. The bearing 200 and the sealing cap 300 are both connected to the first end cap 120. The second end cap 130 is connected to the shell body 110 and covers the second opening 113.

[0065] For example, the housing body 110, the first end cap 120, and the second end cap 130 can all be made of aluminum alloy. The first end cap 120 is connected to one end of the housing body 110 by eight M8 bolts, and sealant is applied between the first end cap 120 and the housing body 110 to improve the sealing performance of the housing 100. The second end cap 130 is connected to the other end of the housing body 110 by eight M8 bolts, and sealant is applied between the second end cap 130 and the housing body 110 to improve the sealing performance of the housing 100.

[0066] In this way, the housing 100 is divided into three parts, each of which is easier to process. The motor under test 2 can be installed into the receiving cavity 111 through the first opening 112 or the second opening 113, and can be taken out from the receiving cavity 111 through the first opening 112 or the second opening 113. The motor under test 2 is easy to put in and take out.

[0067] In some embodiments, such as Figure 1 As shown, the motor test box 1 also includes a rotor liquid inlet 400, which is connected to the housing 100. The rotor liquid inlet 400 and the sealing cover 300 are located on opposite sides of the receiving cavity 111. The rotor liquid inlet 400 is used to communicate with the hollow flow channel 23a inside the rotating shaft 23. The rotor liquid inlet 400 is connected to the second end cover 130.

[0068] Specifically, the rotating shaft 23 has a hollow flow channel 23a extending axially along the rotating shaft 23. The central axis of the hollow flow channel 23a coincides with the central axis of the rotating shaft 23. The hollow flow channel 23a passes through one end of the rotating shaft 23 near the rotor inlet 400, forming an opening. The rotor inlet 400 is inserted into the hollow flow channel through the opening. Furthermore, the rotating shaft 23 may also have spray holes 23b extending radially therefrom. The spray holes 23b communicate with the hollow flow channel 23a. Coolant enters the hollow flow channel 23a through the rotor inlet 400. When the rotating shaft 23 rotates, under centrifugal force, the coolant in the hollow flow channel 23a is thrown from the spray holes 23b onto the stator winding 21b and the bearing 200, cooling the stator winding 21b and the bearing 200, and lubricating the bearing 200, thus reducing the rotational resistance of the rotating shaft 23. The rotating shaft 23 may be provided with multiple sets of spray holes 23b, with 3 to 5 spray holes 23b in each set, and the diameter of each spray hole 23b is set to 2mm to 3mm. The multiple sets of spray holes 23b spray coolant onto the bearing 200 and the stator winding 21b.

[0069] By setting the rotor inlet 400, coolant can be supplied to the hollow flow channel 23a to dissipate heat from the stator winding 21b and the bearing 200 of the shaft 23. It can also reduce the lubrication effect on the bearing 200, reduce the rotational resistance of the shaft 23, ensure the reliability of the working performance of the motor 2 under test, and improve the accuracy of the test results.

[0070] Furthermore, such as Figure 1 and Figure 2 As shown, the housing 100 has a placement bottom surface 180, and a stator liquid inlet 114 is provided on the side wall of the housing 100 away from the placement bottom surface 180. That is, the top wall of the housing 100 has a stator liquid inlet 114. The stator liquid inlet 114 penetrates the housing 100 and communicates with the receiving cavity 111. The stator liquid inlet 114 is located above the receiving cavity 111. Specifically, the stator core 21a is interference-fitted with the housing 100, and a cooling channel is formed between the outer peripheral surface of the stator core 21a and the housing 100. Coolant enters through the stator liquid inlet 114, and sprays onto both ends of the stator winding 21b and the stator core 21a through the cooling channel.

[0071] The motor test box 1 is placed on a support by placing its bottom surface 180, such as on a table or on an operating platform.

[0072] By setting the stator liquid inlet 114, the stator assembly 21 of the electronic components in the motor test box 1 can be cooled, ensuring the reliability of the working performance of the motor 2 under test and improving the accuracy of the test results.

[0073] Furthermore, the housing 100 has a partition wall 190 within the receiving cavity 111, which divides the receiving cavity 111 into a liquid storage cavity 150 and a motor cavity 191. The liquid storage cavity 150 is located below the receiving cavity 111. The partition wall 190 has a liquid passage 115, which communicates with both the liquid storage cavity 150 and the motor cavity 191. The liquid storage cavity 150 is used to collect the coolant in the motor cavity 191. The motor 2 is installed within the motor cavity 191.

[0074] Specifically, the coolant entering the motor cavity 191 from the stator inlet 114 flows to the through-hole 115 under gravity and finally into the reservoir 150. The coolant entering the hollow flow channel 23a from the rotor inlet 400 is ejected from the spray hole 23b and, under gravity, flows to the through-hole 115 and finally into the reservoir 150. This prevents coolant buildup in the motor cavity 191, avoids interference between the coolant in the motor cavity 191 and the rotor assembly 22, reduces the probability of the rotor assembly 22 agitating the coolant, reduces rotational losses of the shaft 23, and improves test accuracy.

[0075] Furthermore, the housing 100 is provided with a return port 160, which communicates with the liquid storage chamber 150 and is used to connect to an external liquid storage device. The coolant in the liquid storage chamber 150 flows into the external liquid storage device through the return port 160. The external liquid storage device can supply coolant to the motor test box 1 through the rotor inlet 400 and the stator inlet 114. This not only achieves coolant circulation but also facilitates operation.

[0076] In some embodiments, such as Figures 1-3 As shown, the housing 100 is provided with an observation port 116, which communicates with the motor cavity 191 and is located at the bottom of the motor cavity 191. The observation port 116 is used to observe the coolant level in the motor cavity 191. The motor test box 1 also includes a transparent observation window 500, which is connected to the housing 100 and covers the observation port 116. The transparent observation window 500 is provided with a preset liquid level line. The transparent observation window 500 can be a transparent acrylic sheet and is fixed to the housing 100 with four M6 bolts. When the coolant level reaches the preset liquid level line, the rotor assembly 22 will agitate the coolant.

[0077] By setting up the observation port 116 and the transparent observation window 500, the liquid level of the coolant in the receiving cavity 111 can be checked in real time. It can be observed whether the liquid level of the coolant has reached the preset liquid level line. If so, the amount of coolant entering the cavity needs to be controlled, thereby effectively preventing the rotor assembly 22 from stirring the coolant, reducing kinetic energy loss, and improving the accuracy of the test of the motor 2 performance.

[0078] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. An electrical machine test box characterized by, include: The housing (100) is provided with a receiving cavity (111) and a shaft extension hole (121). The shaft extension hole (121) communicates with the receiving cavity (111) and extends through the housing (100). The housing (100) forms a mounting hole wall around the shaft extension hole (121). The receiving cavity (111) is used to receive the motor under test (2). The shaft extension hole (121) is used to allow the rotating shaft (23) of the motor under test (2) to pass through. A bearing (200) is disposed on the wall of the mounting hole, and the bearing (200) is adapted to be sleeved on the rotating shaft (23); A sealing cover (300) is connected to the housing (100) and covers the shaft protrusion hole (121). The sealing cover (300) is located on the side of the bearing (200) facing away from the receiving cavity (111). The sealing cover (300) is provided with a liquid seal hole (301). The sealing cover (300) forms a sealing surface around the liquid seal hole (301). A liquid seal annular groove (302) is provided on the sealing surface. The liquid seal annular groove (302) is located between the two axial ends of the sealing cover (300). The liquid seal hole (301) is adapted to be passed through by the rotating shaft (23) of the motor under test (2). The liquid seal annular groove (302) is used to store the coolant flowing through the bearing (200) to form a liquid seal between the sealing cover (300) and the rotating shaft (23).

2. The motor test cartridge of claim 1, wherein, There are multiple liquid sealing annular grooves (302), and the multiple liquid sealing annular grooves (302) are arranged at intervals along the axial direction of the liquid sealing hole (301).

3. The motor test box according to claim 1, characterized in that, The housing (100) has a placement bottom surface (180), and the inner sidewall of the housing (100) has a protrusion. The protrusion protrudes into the receiving cavity (111), and the shaft extension hole (121) passes through the protrusion (170). The protrusion (170) has a drain groove (140), which communicates with the shaft extension hole (121) and is located on the side of the bearing (200) facing the placement bottom surface (180).

4. The motor test box according to claim 3, characterized in that, The shaft extension hole (121) includes: Bearing bore section (1211), the bearing (200) is disposed in the bearing bore section (1211), and the drain groove (140) is connected to the bearing bore section (1211); A sealing hole section (1212) is provided on the side of the bearing hole section (1211) facing the sealing cover (300), and the inner diameter of the sealing hole section (1212) is smaller than the inner diameter of the bearing hole section (1211). A positioning hole section (1213) is provided on the side of the sealing hole section (1212) facing away from the bearing hole section (1211), and the inner diameter of the sealing hole section (1212) is smaller than the inner diameter of the positioning hole section (1213). The sealing cap (300) includes a plug section (310) and a positioning section (320). The plug section (310) is inserted into the sealing hole section (1212) and is interference-fitted with the sealing hole section (1212). The positioning section (320) is connected to the end of the plug section (310) facing away from the bearing (200). The outer diameter of the positioning section (320) is larger than the outer diameter of the plug section (310). The positioning section (320) is located in the positioning hole section (1213).

5. The motor test box according to any one of claims 1-4, characterized in that, Also includes: A rotor inlet (400) is provided on the housing (100). The rotor inlet (400) and the sealing cover (300) are located on opposite sides of the receiving cavity (111). The rotor inlet (400) is used to communicate with the hollow flow channel (23a) in the rotating shaft (23).

6. The motor test box according to any one of claims 1-4, characterized in that, The housing (100) is provided with a placement bottom surface (180), and a stator liquid inlet (114) is provided on a side wall of the housing (100) away from the placement bottom surface (180). The stator liquid inlet (114) penetrates the housing (100) and communicates with the receiving cavity (111).

7. The motor test box according to any one of claims 1-4, characterized in that, The housing (100) has a partition wall (190) inside the receiving cavity (111), the partition wall (190) divides the receiving cavity (111) into a liquid storage cavity (150) and a motor cavity (191), the partition wall (190) has a liquid passage hole (115), the liquid passage hole (115) communicates with the liquid storage cavity (150) and the motor cavity (191), the liquid storage cavity (150) is used to collect the coolant in the motor cavity (191).

8. The motor test box according to claim 7, characterized in that, The housing (100) is provided with a return port (160), and the return port (160) is connected to the liquid storage chamber (150). The return port (160) is used to connect to an external liquid storage device.

9. The motor test box according to claim 7, characterized in that, The housing (100) is provided with an observation port (116), which is connected to the motor cavity (191); The motor test box (1) also includes a transparent observation window (500), which is connected to the housing (100) and covers the observation port (116).

10. The motor test box according to claim 5, characterized in that, The housing (100) includes: The shell body (110) is provided with a receiving cavity (111), a first opening (112) and a second opening (113). The first opening (112) and the second opening (113) are both connected to the receiving cavity (111) and are located at opposite axial ends of the receiving cavity (111). The first end cap (120) is connected to the shell body (110) and seals the first open opening (112). The shaft protrusion hole (121) is provided in the first end cap (120). The bearing (200) and the sealing cap (300) are both connected to the first end cap (120). The second end cap (130) is connected to the shell body (110) and seals the second opening (113). The rotor liquid inlet (400) is connected to the second end cap (130).

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