Condensate drain for motor terminal box

Abstract

This invention relates to the field of drive motor technology, specifically to a condensate drainage device for a motor junction box. The junction box includes a cable connector, a box body, a terminal block, and a junction box cover. The box body is disposed on the rear end cover of the motor. The cable connector is installed on the outside of the box body, the terminal block is installed inside the box body, and the junction box cover is installed on the box body. The condensate drainage device includes a water collection trough machined at the bottom of the box body and a drain bolt. The bottom surface of the water collection trough has a threaded through hole that matches the drain bolt. The beneficial technical effects of this invention include: by collecting condensate in the water collection trough, the accumulated water can be cleaned during regular vehicle maintenance, preventing excessive condensate buildup and thus avoiding problems such as motor short circuits or withstand voltage failures.

Description

Technical Field

[0001] This invention relates to the field of drive motor technology, and more specifically to a condensate draining device for a motor junction box. Background Technology

[0002] With the development of automobiles, new energy vehicles have gradually become the main means of transportation. The power of these vehicles comes from the drive motor. The drive motor mainly consists of a rotor assembly, stator assembly, housing, end covers, and junction box, with an overall protection rating of IP67. During operation, the stator assembly generates significant heat due to copper losses, leading to an increase in temperature within the motor cavity. Water droplets condense from water vapor on the junction box cover at the far end of the motor. Accumulated condensate can cause short circuits or withstand voltage failures in the motor. Therefore, it is necessary to address the risks posed by condensate generated by the drive motor.

[0003] Chinese Patent CN112327155A, published on February 5, 2021, discloses a system and method for testing the anti-condensation performance of electric vehicle drive motors. The system includes a test bench, a controller fixed on the test bench, a drive motor under test, a secondary drive motor under test, a coupling, a controller for the drive motor under test, and a high-low temperature test chamber. The drive motor under test is sealed within the high-low temperature test chamber during the test. The test method includes: controlling the temperature inside the high-low temperature test chamber within a preset first temperature range; controlling the drive motor under test to run at its maximum speed and rated power for a preset first duration; controlling the drive motor under test to run at its rated speed and rated power for a preset second duration; repeating the above two operations according to a preset number of cycles; after the cycle ends, controlling the drive motor under test to stop running, thus ending the test process. Using the above system and method to test the anti-condensation performance of drive motors eliminates the need for transportation to low-temperature regions, effectively saving testing costs. Its technical solution aims to improve the anti-condensation performance of electric vehicle drive motors and solve the condensation problem of drive motors. However, its technical solution cannot completely eliminate the safety risks caused by drive motor condensation. Summary of the Invention

[0004] The technical problem this invention aims to solve is the current lack of a condensate drainage device for drive motors. This invention proposes a condensate drainage device for motor junction boxes, which can drain condensate from the drive motor, ensuring the safe operation of the drive motor.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a condensate drain device for a motor junction box, wherein the junction box includes a cable connector, a box body, a terminal block, and a junction box cover; the box body is disposed on the rear end cover of the motor; the cable connector is installed on the outside of the box body; the terminal block is installed inside the box body; and the junction box cover is installed on the box body.

[0006] The condensate drainage device includes a water collection trough and a drain bolt machined at the bottom of the box body, and the bottom surface of the water collection trough is machined with a threaded through hole that matches the drain bolt.

[0007] Preferably, the bottom surface of the water collection tank has an inclined surface that slopes toward the threaded through hole.

[0008] Preferably, the condensate drain device further includes a sealing gasket located between the drain bolt and the housing.

[0009] Preferably, the drain bolt is an internal hex bolt.

[0010] Preferably, the condensate drain device further includes a sponge, which is fixedly connected to the top of the drain bolt.

[0011] Preferably, the condensate drain device further includes a drain rope, which is attached to the junction box cover and extends into the water collection tank at its bottom end.

[0012] A condensate drain device for a motor junction box, the junction box comprising a cable connector, a box body, a terminal block, and a junction box cover, the box body being disposed on the rear end cover of the motor, the cable connector being installed on the outside of the box body, the terminal block being installed inside the box body, and the junction box cover being installed on the box body.

[0013] The condensate drainage device includes a water collection trough and a drain column machined at the bottom of the box. The bottom surface of the water collection trough is machined with a threaded through hole. The drain column includes a water collection shell, a drain cover, a bundle column, and a fiber bundle. The water collection shell is tubular, and the top of the water collection shell is machined with an external thread that matches the threaded through hole. The drain cover is threaded to the bottom of the water collection shell and closes the bottom of the water collection shell. The bundle column is fixedly connected to the drain cover. One end of the fiber bundle is fixedly connected to the drain cover, and the other end of the fiber bundle is fixedly connected to the upper part of the bundle column.

[0014] Preferably, a compression ring is provided inside the water collection shell, the compression ring is fixedly connected to the water collection shell, and the bundled column and the fiber bundle both pass through the compression ring.

[0015] Preferably, the inner ring of the extrusion ring is chamfered.

[0016] Preferably, the cellulose is made of a hydrophobic material.

[0017] The beneficial technical effects of this invention include: by collecting condensate in a water collection tank, the water in this location can be cleaned during regular vehicle maintenance, ensuring that excessive condensate buildup does not occur, thus avoiding problems such as motor short circuits or withstand voltage failures; by incorporating a sponge, the vibration generated during vehicle operation can be prevented from causing condensate to be shaken onto electrical components, affecting electrical safety; and by using fiber bundles, condensate in the junction box can be more effectively contained, protecting the electrical components inside the junction box from vibrations generated during vehicle operation.

[0018] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0019] The invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the drive motor structure.

[0021] Figure 2 This is a schematic diagram showing the installation position of the condensate drain device according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of condensate falling according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of condensate drainage according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the condensate drain device according to Embodiment 2 of the present invention.

[0025] The components are: 1. Front end cover, 2. Stator assembly, 3. Rotor assembly, 4. Housing, 5. Rear end cover, 6. Junction box, 61. Cable connector, 62. Box body, 63. Terminal block, 64. Junction box cover, 65. Water collection tank, 66. Drain bolt, 71. Bundling column, 72. Fiber bundle, 73. Extrusion ring, 74. Water collection shell, 75. Drain cover. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0027] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” are used only to indicate orientation or positional relationship for the convenience of describing the embodiments and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0028] Before introducing the technical solution of this embodiment, the application scenario of this embodiment will be introduced.

[0029] The condensate drainage device provided in this embodiment is used in the drive motor of a new energy vehicle. Please refer to the appendix. Figure 1 The drive motor includes a rotor assembly 3, a stator assembly 2, a housing 4, a rear end cover 5, and a junction box 6. A front end cover 1 is installed at the front end of the housing 4, and a rear end cover 5 is installed at the rear end of the housing 4. Both the front end cover 1 and the rear end cover 5 have bearing holes, and bearings are installed in the bearing holes. Two bearings are used to install the rotor assembly 3, and the stator assembly 2 is installed inside the housing 4. The junction box 6 is installed at the rear end cover 5.

[0030] Please see the appendix Figure 2 The junction box 6 includes a cable connector 61, a box body 62, terminal blocks 63, and a junction box cover 64. The box body 62 is located on the rear end cover 5 of the motor. The cable connector 61 is installed on the outside of the box body 62, the terminal blocks 63 are installed inside the box body 62, and the junction box cover 64 is installed on the box body 62. The motor driver outputs three-phase current, which is connected to the stator assembly 2 of the motor through three phase cables and one grounding cable. There are four terminal blocks 63 inside the junction box 6 on the rear end cover 5, and four corresponding cable connectors 61 on the outside. When the motor is powered on, the internal temperature of the motor will rise due to losses, and water vapor inside the motor will condense into water droplets on the farthest junction box cover 64. When there is too much condensation, it will affect the safety of the drive motor.

[0031] Therefore, this embodiment provides a condensate drain device for the motor junction box 6. Please refer to the attached document. Figure 3 The condensate drainage device includes a water collection trough 65 machined at the bottom of the housing 62 and a drain bolt 66. The bottom surface of the water collection trough 65 has a threaded through hole that matches the drain bolt 66. By collecting the condensate in the water collection trough 65, the water can be cleaned during regular vehicle maintenance, ensuring that excessive condensate buildup does not occur, thus preventing motor short circuits or overvoltage failures.

[0032] The condensate drainage device also includes a sponge, which is fixedly connected to the top of the drain bolt 66. By incorporating the sponge, vibrations generated during vehicle movement can prevent condensate from being shaken onto electrical components, thus avoiding any impact on electrical safety.

[0033] The condensate drainage device also includes a drain rope, which is attached to the junction box cover 64 and extends into the water collection tank 65. The drain rope guides condensate adhering to the inside of the junction box cover 64 into the water collection tank 65 for collection, preventing condensate from splashing onto other components inside the junction box 64 during vibration. Please refer to the appendix. Figure 4 Condensation forms at point a1 on the junction box cover 64, and this condensation collects into droplets a2. Under gravity, these droplets a2 will flow down surface a1 and collect at point b1, i.e., the water collection trough 65. During regular vehicle maintenance, simply unscrew the drain bolt 66 to drain the water from the junction box 6.

[0034] The bottom surface of the water collection tank 65 has an inclined surface that slopes towards the threaded through hole. The inclined surface helps to drain condensate water more quickly and completely.

[0035] The condensate drain device also includes a sealing gasket located between the drain bolt 66 and the housing 62. The sealing gasket prevents condensate from leaking out of the junction box 6 and affecting the safety of other vehicle components.

[0036] The drain bolt 66 is a socket head cap screw. Socket head cap screws are suitable for use in confined spaces.

[0037] Example 2:

[0038] A condensate drainage device for a motor junction box 6 is disclosed. The junction box 6 includes a cable connector 61, a box body 62, a terminal block 63, and a junction box cover 64. The box body 62 is mounted on the rear end cover 5 of the motor. The cable connector 61 is installed on the outside of the box body 62, the terminal block 63 is installed inside the box body 62, and the junction box cover 64 is installed on the box body 62. Please refer to the appendix. Figure 5 The condensate drainage device includes a water collection trough 65 and a drain column machined at the bottom of the box 62. The bottom surface of the water collection trough 65 is machined with a threaded through hole. The drain column includes a water collection shell 74, a drain cover 75, a bundle column 71, and a fiber bundle 72. The water collection shell 74 is tubular and has an external thread that matches the threaded through hole at the top. The drain cover 75 is threaded to the bottom of the water collection shell 74 and closes the bottom of the water collection shell 74. The bundle column 71 is fixedly connected to the drain cover 75. One end of the fiber bundle 72 is fixedly connected to the drain cover 75, and the other end of the fiber bundle 72 is fixedly connected to the upper part of the bundle column 71.

[0039] The water collection shell 74 contains a compression ring 73, which is fixedly connected to the water collection shell 74. Both the bundled column 71 and the fiber bundle 72 pass through the compression ring 73. The inner ring of the compression ring 73 has a chamfer. The compression ring 73 can squeeze out the condensate from the fiber bundle 72. When the drain cover 75 is removed, pulling down the drain cover 75 will squeeze out the water trapped in the fiber bundle 72, leaving it on the upper part of the compression ring 73. When the fiber bundle 72 is completely extracted, the water on the upper part of the compression ring 73 will flow out. The cellulose is made of a hydrophobic material. It can both trap condensate and quickly drain it during drainage. Compared to Embodiment 1, this embodiment can more effectively trap condensate in the junction box 6 through the fiber bundle 72, protecting the electrical components inside the junction box 6 from vibrations generated during vehicle operation.

[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A motor terminal box condensate water drainage device, the terminal box comprising a cable joint, a box body, a terminal seat and a terminal box cover, the box body being arranged on the rear end cover of the motor, the cable joint being mounted outside the box body, the terminal seat being mounted inside the box body, and the terminal box cover being mounted on the box body, characterized in that the condensate water drainage device comprises a water collecting groove and a drainage column, the water collecting groove being processed at the bottom of the box body, a threaded through hole being processed at the bottom surface of the water collecting groove, the drainage column comprising a water collecting shell, a drainage cover, a bundle collecting column and a fiber bundle, the water collecting shell being tubular, external threads being processed at the top of the water collecting shell and matching the threaded through hole, the drainage cover being threadedly connected with the bottom of the water collecting shell, the drainage cover closing the bottom of the water collecting shell, the bundle collecting column being fixedly connected with the drainage cover, one end of the fiber bundle being fixedly connected with the drainage cover, and the other end of the fiber bundle being fixedly connected with the upper part of the bundle collecting column. The water collecting shell is provided with an extrusion ring, the extrusion ring being fixedly connected with the water collecting shell, and the bundle collecting column and the fiber bundle both penetrating through the extrusion ring.

2. The motor terminal box condensate water drainage device according to claim 1, characterized in that an inner circle of the extrusion ring is chamfered.

3. The motor terminal box condensate water drainage device according to claim 1 or 2, characterized in that the fiber bundle is made of a hydrophobic material. ​ ​ ​

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