Anti-condensation sealing structure for driving motor of new energy automobile

Abstract

The utility model discloses an anti-condensation sealing structure for a driving motor of a new energy automobile. The anti-condensation sealing structure comprises a motor end cover, a wiring board, a wiring nose, a stator outgoing line, a sealing partition plate, a sealing rubber sleeve and a junction box side cover plate, a junction box used for containing a wiring board is arranged above the motor end cover, and the top of the junction box is sealed through a junction box cover plate. A wiring nose connected with the wiring board is led out to a high-voltage wiring harness connecting cavity on the side face of the motor end cover and connected with a stator outgoing line, the stator outgoing line penetrates through a sealing rubber sleeve, the sealing rubber sleeve is arranged on the upper portion of a sealing partition plate, and the sealing partition plate is fixed to a motor cavity on the motor end cover through bolts. The outermost layer of the motor end cover is provided with a junction box side cover plate. The sealing partition plate and the sealing rubber sleeve are designed in a profiling mode, the sealing effect is good after installation, the high-voltage junction box and a motor cavity can be effectively isolated after the high-voltage junction box and the sealing rubber sleeve are fixed through bolts and tightened by a certain torque, and the sealing isolation effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy vehicles, and particularly relates to a dew-proof sealing structure for a driving motor of a new energy vehicle. Background Technique

[0002] With the continuous development of new energy electric drive systems, the reliability requirements for each component have gradually increased. As an important part of the electric drive system, the motor needs to prevent insulation failures caused by dew condensation problems and avoid affecting the normal driving of the whole vehicle. Currently, this problem is an important content in the research of driving motors for new energy vehicles.

[0003] Affected by seasons and the environment, when the motor works in an environment with high humidity and low temperature, dew condensation is likely to occur on the inner wall of the motor. When the dew condensation is severe, it will greatly reduce the internal insulation performance of the motor, resulting in insulation failure alarms for the motor, and even causing the motor to be ablated due to short circuits. According to the analysis of the motor structure, the dew condensation phenomenon of the motor mainly occurs on the inner wall of the motor housing and inside the high-voltage wire harness connection chamber, and dew condensation is likely to occur inside the high-voltage wire harness connection chamber. This is mainly because after the motor works for a period of time, the motor winding will generate a large amount of heat. The cavity space is small, the temperature difference between the inside and outside of the cavity is large, but the housing wall thickness is large, the heat transfer is slow, and the internal temperature drops slowly. There is a thin cover plate at the high-voltage wire harness connection, the heat transfer is fast, and the temperature drops quickly. Therefore, the water vapor inside the motor is easily liquefied when it meets the cold at the cover plate, forming water droplets. When the water droplets accumulate more, they will form a water flow, reducing the electrical safety distance between the high-voltage wire or the connection and the housing. In severe cases, the conductive part will be connected to the machine shell, causing insulation failure.

[0004] The current motor dew-proof measures are mostly as follows:

[0005] 1. Paste heat-insulating materials on the inner side of the cover plate;

[0006] 2. Increase the absorption of water materials pasted inside the cavity;

[0007] 3. Isolate the motor cavity from the high-voltage wire harness connection part in the axial direction of the three-phase lines of the stator winding.

[0008] For Measure 1, pasting heat-insulating materials on the cover plate can solve the problem of rapid heat transfer isolation in a short time, but there will be an aging problem in long-term use, affecting the heat-insulating performance, and even falling off, causing potential safety hazards. The durability of the material needs further research.

[0009] For Measure 2, adding water-absorbing materials inside the cavity can reduce the risk of dew condensation to a certain extent. However, when the humidity inside the motor is high, simply relying on the water-absorbing materials cannot completely prevent dew condensation, and its reliability needs to be discussed.

[0010] Measure 3 This method adopts an isolation solution, but axial isolation will cause relatively troublesome actual operation, and the state inside the sealed isolation cannot be confirmed. The consistency of the sealing effect is not high, and there is a risk of occasional condensation. Summary of the Invention

[0011] The purpose of the utility model is to provide an anti-condensation sealing structure for a driving motor of a new energy vehicle. The assembly process of the components involved in this sealing solution is simple, easy to implement, and has a good anti-condensation effect.

[0012] The technical solution adopted by the utility model is: an anti-condensation sealing structure for a driving motor of a new energy vehicle, including a motor end cover, a wiring board, a wiring nose, a stator lead wire, a sealing partition, a sealing rubber sleeve, and a side cover plate of the junction box; a junction box for installing the wiring board is provided above the motor end cover, and the top of the junction box is sealed by a junction box cover plate; the wiring nose connected to the wiring board is led out to the high-voltage wiring harness connection chamber on the side of the motor end cover, the wiring nose is connected to the stator lead wire, the stator lead wire passes through the sealing rubber sleeve, the sealing rubber sleeve is arranged on the upper part of the sealing partition, the sealing partition is fixed to the motor chamber on the motor end cover by bolts, and a side cover plate of the junction box is provided on the outermost layer of the motor end cover.

[0013] Furthermore, the sealing rubber sleeve is in an I-shaped shape, and a wire passing hole closely fitting the stator lead wire is provided in the middle thereof.

[0014] Furthermore, the sealing partition is provided with a profiling structure with alternating concave and convex shapes, and the I-shaped side surface of the sealing rubber sleeve can match the convex structure on the upper part of the sealing partition.

[0015] Furthermore, a breather valve is provided on the motor end cover between the motor end cover and the side cover plate of the junction box.

[0016] The beneficial effects of the utility model are as follows:

[0017] 1. The assembly process of the utility model is simple and reliable; the sealing partition and the sealing rubber sleeve adopt a profiling design, and after installation, the sealing effect is good. At the same time, they are fixed with bolts, and after tightening a certain torque, the high-voltage junction box can be effectively isolated from the motor chamber, and the sealing and isolation effect is good;

[0018] 2. The utility model can effectively solve the problem of condensation generated in the cavity where the high-voltage wiring harness of the motor is connected, and can improve the reliability of the motor working in a relatively humid and low-temperature environment. Brief Description of the Drawings

[0019] Figure 1 is an exploded view of the structure of the utility model;

[0020] Figure 2 is a cross-sectional view of the structure of the utility model;

[0021] Figure 3a Structural schematic of the sealing rubber sleeve Figure 1 ;

[0022] Figure 3b Structural schematic of the sealing rubber sleeve Figure 2 ;

[0023] Figure 4 Sealing partition for the anti-condensation structure

[0024] In the figure: 1 - motor end cover, 2 - terminal board, 3 - junction box cover plate, 4 - terminal nose, 5 - stator lead wire, 6 - sealing rubber sleeve, 7 - sealing partition, 8 - bolt, 9 - side cover plate of the junction box, 10 - breather valve, 11 - high-voltage junction box, 12 - high-voltage harness connection chamber, 13 - motor chamber, 14 - wire passing hole. Specific embodiments

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated position or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] As Figure 1 and Figure 2 shown, the present invention is an anti-condensation sealing structure for a new energy vehicle drive motor, which is used to isolate the high-voltage junction box 11 from the motor chamber 13 to prevent the water vapor generated inside the motor from entering the high-voltage junction box 11 and causing a condensation phenomenon.

[0029] The utility model includes a high-voltage terminal box 11 arranged at the top of a motor end cover 1 and a motor chamber 13 at the side. A wiring board 2 is arranged inside the high-voltage terminal box 11 and is sealed by a terminal box cover plate 3 at the top. The high-voltage terminal box 11 and the motor chamber 13 are partially communicated, so that a wiring nose 4 is arranged in the motor chamber 13 and connected to the wiring board 2, and a stator lead wire 5 is connected to the wiring nose 4.

[0030] As Figure 3a and Figure 3b shown, the stator lead wire 5 passes through a sealing rubber sleeve 6. The sealing rubber sleeve 6 is in an I shape, and a wire passing hole 14 which is closely attached to the stator lead wire 5 is arranged in the middle part thereof. The sealing rubber sleeve 6 is arranged at the upper part of a sealing partition plate 7 which is connected to the motor chamber 13.

[0031] As Figure 4 shown, the upper part of the sealing partition plate 7 is provided with a profiling structure with alternating concave and convex parts. The I-shaped side surface of the sealing rubber sleeve 6 can be matched with the convex structure at the upper part of the sealing partition plate 7, so that the sealing partition plate 7 completely separates the motor chamber 13 and a high-voltage wire harness connection chamber 12.

[0032] The sealing partition plate 7 is fixed to the motor chamber 13 by bolts 8. The outermost layer of the motor chamber 13 is provided with a terminal box side cover plate 9, and the terminal box side cover plate 9 is fixed to the motor end cover 1.

[0033] An air vent valve 10 is arranged on the motor end cover 1 between the motor end cover 1 and the terminal box side cover plate 9.

[0034] The utility model can ensure that water vapor in the motor chamber will not enter or rarely enter the high-voltage wire connection chamber when the motor is working, thereby effectively avoiding the problem that the motor fails due to condensation when the motor works in an environment with high humidity and low temperature.

[0035] The above content is a further detailed description of the utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, without departing from the concept of the utility model, several simple deductions or replacements can be made, and all should be regarded as belonging to the protection scope of the utility model.

Claims

1. A dew condensation prevention and sealing structure for a driving motor of a new energy vehicle, characterized in that: It includes a motor end cover, a terminal board, a terminal nose, a stator lead wire, a sealing partition board, a sealing rubber sleeve and a side cover plate of the junction box; a junction box for installing the terminal board is provided above the motor end cover, and the top of the junction box is sealed by a junction box cover plate; the terminal nose connecting the terminal board is led out to the high-voltage wire harness connection chamber on the side of the motor end cover, the terminal nose is connected to the stator lead wire, the stator lead wire passes through the sealing rubber sleeve, the sealing rubber sleeve is arranged on the upper part of the sealing partition board, the sealing partition board is fixed to the motor chamber on the motor end cover by bolts, and a side cover plate of the junction box is arranged on the outermost layer of the motor end cover.

2. The anti-condensation sealing structure of a driving motor for a new energy vehicle according to claim 1, wherein: The sealing rubber sleeve is in an I shape, and a wire passing hole closely fitting with the stator lead wire is arranged in the middle thereof.

3. The anti-condensation sealing structure of a driving motor for a new energy vehicle according to claim 1, characterized in that: The sealing partition board is provided with a profiling structure with alternating concave and convex parts, and the I-shaped side surface of the sealing rubber sleeve can be matched with the convex structure on the upper part of the sealing partition board.

4. The anti-condensation sealing structure of a drive motor for a new energy vehicle according to claim 1, wherein: A breather valve is arranged on the motor end cover between the motor end cover and the side cover plate of the junction box.

Images