阅读说明：本技术 一种冷却装置 (Cooling device ) 是由 井睿康 邹煜林 胡勇峰 贾广隆 胡华 叶文宏 石鸿佼 史文波 李蓉 孟繁东 于 2018-08-01 设计创作，主要内容包括：本发明提供一种冷却装置,包括用于冷却电机端部绕组的油冷装置。能够降低电机端部绕组的温度。(The invention provides a cooling device, comprising an oil cooling device for cooling an end winding of an electric machine. The temperature of the motor end winding can be reduced.)

1. A cooling arrangement comprising an oil cooling arrangement for cooling an end winding of an electrical machine.

2. The cooling device of claim 1, wherein the oil cooling device comprises an oil spray box detachably arranged on the motor end cover and close to the end part of the motor winding, and an oil spray nozzle communicated with the oil spray box, wherein the oil spray nozzle extends into the motor cavity and is close to the end part of the motor winding;

an oil inlet is formed in the oil spraying box; the motor bottom is equipped with the oil storage box of dismantlement formula, the oil storage box bottom is equipped with the oil-out.

3. The cooling device of claim 2, wherein the oil spray box is configured as a hollow circular ring structure.

4. The cooling device of claim 3, wherein the oil jets are arranged in groups circumferentially along the oil spray cartridge.

5. The cooling device as claimed in claim 4, wherein the oil spray box is provided with a mounting hole.

6. A cooling device according to any one of claims 2 to 5, characterized in that the oil reservoir is constructed as a hollow, elongated housing structure.

7. The cooling device as claimed in any one of claims 2 to 6, wherein the oil jet box and the oil storage box are both made by welding.

8. The cooling device as claimed in any one of claims 2 to 6, wherein the oil jet box and the oil reservoir box are each made by casting.

9. The cooling device as claimed in any one of claims 2 to 8, wherein the reservoir box is connected to the motor housing by a bolt.

Technical Field

The invention belongs to the technical field of motors for new energy automobiles, and particularly relates to a cooling device.

Background

With the development and progress of the technology, the light weight of the motor has become a technological development direction. Under many conditions, users desire the motor to be lighter and smaller, and ensure the output power and the output torque of the motor to be constant, and even require the motor to have higher output capacity. This situation makes the average operating temperature of the finally designed motor higher and higher. The working condition of the motor becomes severe, so that the aging of the insulating material of the motor is accelerated, the service life of bearing lubricating grease is shortened, and the service life and reliability of the motor are finally influenced by the high-temperature work of the motor. Therefore, the key of the lightweight design of the motor is to improve the cooling condition of the motor, improve the heat dissipation capacity of the motor, reduce the maximum working temperature and the average temperature rise of the motor, improve the running reliability of the motor and prolong the service life of the motor.

At present, in the new energy automobile industry, a driving motor generally adopts a mode that a cooling liquid is introduced into a shell to cool the motor. The working principle of the cooling mode is that cooling liquid cooled by an external radiator enters a motor cooling cavity channel from a water inlet, absorbs heat transferred to the motor shell in the motor, flows out from a water outlet of the motor, finally enters the external radiator for heat dissipation, and the cooling mode works in a circulating mode. The cooling method is a cooling means generally adopted in the new energy automobile industry at present, has the advantages of good cooling effect and capability of meeting most of application requirements in the market, and has the defects that only indirect cooling can be implemented on the iron core part of the motor shell, the distribution of the cooling part is uneven, the temperature of the iron core part of the motor is relatively low, the end part of the motor winding is suspended in the motor, the temperature transmission effect is poor, and the temperature of the end winding is the highest temperature part of the whole motor. The cooling mode with uneven temperature distribution inside the motor limits further improvement of the power density of the motor to a certain extent, and at present, the power density of the driving motor of the electric automobile has reached a bottleneck under the cooling mode, and the light-weight design difficulty of the driving motor is multiplied.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a cooling device capable of reducing the temperature of an end winding of a motor.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a cooling arrangement includes an oil cooling arrangement for cooling an end winding of an electric machine.

According to the cooling device, the end part and the winding of the motor winding are directly cooled through the oil cooling device, so that the temperature of the end winding is reduced, the aim of reducing the temperature of the motor is fulfilled, and the power density and the light weight level of the motor are further improved.

With respect to the above technical solution, further improvements as described below can be made.

According to the cooling device of the invention, in a preferred embodiment, the oil cooling device comprises an oil injection box which is detachably arranged on the motor end cover and is close to the end part of the motor winding, and an oil injection nozzle communicated with the oil injection box, wherein the oil injection nozzle extends into the motor cavity and is close to the end part of the motor winding. An oil inlet is arranged on the oil injection box. The motor bottom is equipped with the oil storage box of dismantlement formula, and oil storage box bottom is equipped with the oil-out.

The oil cooling device is arranged outside the motor cavity and combined with the motor body in a detachable mode, and does not influence the cooling structure of the original shell part of the motor and works independently of each other. After cooling oil radiated by the radiator enters the oil injection box through the oil inlet, the cooling oil is directly sprayed on the windings at two ends of the motor through the oil injection nozzle, the end windings are directly cooled, and the cooled cooling oil is collected at the bottom of the cavity of the motor and flows into the oil storage box and finally flows into the radiator outside the motor through the oil outlet for circulating work.

In particular, in a preferred embodiment, the fuel injection cartridge is designed as a hollow annular ring. The structure can be very conveniently matched with the motor end cover for installation, and the structure can be simplified as far as possible while the volume of the oil spraying box is increased.

Further, in a preferred embodiment, the oil jets are arranged in several groups along the circumference of the cartridge. Set up a plurality of fuel sprayer on the fuel sprayer box, can play better radiating effect to the winding head to can reduce motor temperature better.

In particular, in a preferred embodiment, the oil jet box is provided with a mounting hole. The oil injection box can be conveniently fixed on the end cover of the motor through the mounting hole.

In particular, in a preferred embodiment, the reservoir is constructed as a hollow, elongated housing structure. Simple structure, storage capacity is big, can extremely conveniently install with the casing cooperation of motor bottom.

Further, in a preferred embodiment, the oil spraying box and the oil storage box are both made by welding. The welding process is simple and quick, and the production and manufacturing cost is low.

Further, in a preferred embodiment, the fuel spray box and the fuel storage box are both made by casting. The casting process is simple and quick, and the production and manufacturing cost is low.

In particular, in a preferred embodiment, the reservoir box is bolted to the motor housing. The bolt connection can be disassembled and fixed simply and quickly, and the maintenance of the oil cooling device is convenient.

Compared with the prior art, the invention has the advantages that: the temperature of the motor end winding can be reduced.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

fig. 1 schematically shows the working principle of a cooling device according to an embodiment of the present invention;

fig. 2 schematically shows the overall structure of a cooling device of an embodiment of the present invention;

fig. 3 schematically shows an a-directional partial structure of an embodiment of the present invention.

In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.

Detailed Description

The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.

Fig. 1 schematically shows the working principle of a cooling device 10 according to an embodiment of the present invention. Fig. 2 schematically shows the overall structure of the cooling device 10 of the embodiment of the present invention. Fig. 3 schematically shows an a-directional partial structure of an embodiment of the present invention.

As shown in fig. 1, a cooling apparatus 100 according to an embodiment of the present invention includes an oil cooling apparatus 10 for cooling an end winding 4 of an electric machine. According to the cooling device provided by the embodiment of the invention, the end part and the winding of the motor winding are directly cooled through the oil cooling device, so that the temperature of the end winding is reduced to achieve the purpose of reducing the temperature of the motor, and the power density and the light weight level of the motor are further improved.

According to the cooling device 10 of the present invention, as shown in fig. 2, in a preferred embodiment, the oil cooling device 10 comprises an oil spray box 1 which is detachably arranged on the motor end cover 5 and close to the motor end winding 4, and an oil spray nozzle 2 which is communicated with the oil spray box 1, wherein the oil spray nozzle 2 extends into the motor cavity 6 and close to the motor end winding 4. An oil inlet 11 is arranged on the oil spraying box 1. The motor bottom is equipped with the oil storage box 3 of dismantlement formula, and oil-out 31 is equipped with to oil storage box 3 bottom. The oil cooling device is arranged outside the motor cavity and combined with the motor body in a detachable mode, and does not influence the cooling structure of the original shell part of the motor and works independently of each other. After cooling oil radiated by the radiator enters the oil injection box through the oil inlet, the cooling oil is directly sprayed on the windings at two ends of the motor through the oil injection nozzle, the end windings are directly cooled, and the cooled cooling oil is collected at the bottom of the cavity of the motor and flows into the oil storage box and finally flows into the radiator outside the motor through the oil outlet for circulating work.

As shown in fig. 3, in particular, in a preferred embodiment, the cartridge 1 is designed as a hollow circular ring. The structure can be very conveniently matched with the motor end cover for installation, and the structure can be simplified as far as possible while the volume of the oil spraying box is increased. Further, in a preferred embodiment, the oil jets 2 are arranged in several groups along the circumference of the injection cartridge 1. Set up a plurality of fuel sprayer on the fuel sprayer box, can play better radiating effect to the winding head to can reduce motor temperature better. In particular, in a preferred embodiment, the oil jet box is provided with a mounting hole. The oil injection box can be conveniently fixed on the end cover of the motor through the mounting hole.

As shown in fig. 2, in particular, in a preferred embodiment, the reservoir 3 is constructed as a hollow, elongated housing structure. Simple structure, storage capacity is big, can extremely conveniently install with the casing cooperation of motor bottom.

Further, in a preferred embodiment, the fuel injection box 1 and the fuel storage box 3 are both made by welding. The welding process is simple and quick, and the production and manufacturing cost is low. Further, in another preferred embodiment, the fuel injection box 1 and the fuel storage box 3 are both made by casting. The casting process is simple and quick, and the production and manufacturing cost is low.

Specifically, in a preferred embodiment, the reservoir 3 is bolted to the motor housing. The bolt connection can be disassembled and fixed simply and quickly, and the maintenance of the oil cooling device is convenient.

As shown in fig. 1 and 2, the cooling device 100 according to the embodiment of the present invention operates as follows:

first, the cooling system of the cooling device 100 according to the embodiment of the present invention is divided into two paths, one path is the original casing cooling system, and the other path is the winding end oil cooling device. The working principle of the cooling system of the motor shell is consistent with that of the original cooling system and is kept unchanged, namely, cooling liquid after heat dissipation of the radiator enters a motor shell water channel from an inlet D of the motor shell, circulates in the motor shell water channel, absorbs heat transferred to the motor shell water channel part by the motor, the temperature of the cooling liquid rises, the cooling liquid flows out from an outlet E of the motor shell and finally flows into the external radiator for heat dissipation, and the cooling liquid circulates. The working principle of the oil cooling device 10 of the cooling device 100 of the embodiment of the invention is that cooling oil radiated by a radiator enters the oil injection box 1 through the oil inlets 11 of the oil injection box 1 arranged outside the two ends of the motor, then the cooling oil is sprayed out through the oil nozzles 2 distributed on the oil injection box 1, the sprayed cooling oil is scattered on windings at the two ends of the motor to directly absorb heat on the ends of the windings, the cooling oil drips to the bottom of the cavity of the motor after absorbing the heat, is discharged into the oil storage box 3 at the bottom of the motor through the oil leakage port at the bottom of the cavity, and the cooling oil collected into the oil storage box 3 flows into the radiator through the oil outlet 31 to be radiated and cooled, thus the circulation work is carried out. And determining that the heat absorbed by the cooling liquid of the motor shell is A and the heat absorbed by the oil cooling device at the end part of the winding is B, wherein the total heat C taken away from the motor when the cooling device 100 works is the sum of A and B. The flow rate of the cooling liquid flowing through the shell part with the absorbed heat A is Q1, the flow rate of the cooling liquid flowing through the winding end part with the absorbed heat B is Q2, and the flow rate of the whole cooling system for dissipating heat of the motor is Q. Wherein the flow ratio K is Q1: q2.

According to the embodiments, it can be seen that the cooling device according to the present invention can reduce the temperature of the motor end winding.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.