CN205212638U - Cooling structure of automobile -used motor of new forms of energy - Google Patents

Abstract

The utility model relates to a cooling structure of automobile -used motor of new forms of energy, including water jacket and shell, its characterized in that, the radial orientation cloth of cylindrical surface has a fuisw rib along the water jacket in, and the fuisw rib outside and shell closely cooperate to make and form the confined between water jacket and shell and cool off the water course, the both ends of cooling water course are water inlet and delivery port, and the cooling water course includes radial by -pass, radial by -pass and middle part water course down gone up, and the water inlet connection is gone up the by -pass or is connected with the middle part water course behind the by -pass down. The beneficial effects of the utility model are that improve electric machine cooling water jacket structure, reduce the motor stator temperature, improve the new energy automobile driving motor reliability of operation.

Description

A cooling structure for a new energy vehicle motor

technical field

The utility model relates to a cooling device for electric appliances, in particular to a cooling water jacket for a motor stator.

Background technique

With the development of new energy vehicle technology, it is required to gradually increase the output torque and power of the drive motor, and to reduce the installation space of the motor, which makes the thermal load of the motor continuously increase. The high heat load characteristics of the motor put forward strict requirements on the heat conduction inside the motor and the external cooling technology of the motor. The cooling system of the motor must be reasonably selected and arranged to achieve reliable and stable operation of the motor under various working conditions from the perspective of thermal energy management.

The permanent magnet synchronous motor is currently the most widely used motor for vehicle drive motors. The permanent magnet motor stator is composed of a stator core with good thermal conductivity and a winding wrapped by insulating material. The internal loss of the stator is mainly generated by the stator core and the stator winding. The heat generated by the winding is transferred to the iron core through the insulating material, and then transferred to the casing cooling water jacket together with the heat generated by the iron core, and the heat is taken away by the cooling water. The end part of the stator winding is not in contact with the stator core, and the heat dissipation condition is poor. Filling the heat conduction medium between the end of the winding and the end cover of the casing can improve the heat dissipation of the winding end to a certain extent, but it is limited by the filled heat conduction medium and the end cover. The thermal conductivity of the winding insulation material itself is limited, and the heat dissipation effect is not ideal.

At present, the water jacket structure of the drive motor of new energy vehicles mostly adopts spiral water channel (as shown in Figure 1), S-shaped channel (as shown in Figure 2) or spoiler water channel (as shown in Figure 3). The motor system cooled by spiral water channel and S-shaped water channel has obvious temperature gradient in the axial direction of the motor, which is not conducive to the heat dissipation at the end of the motor winding; Contact, but the uncontrollability of the coolant flow is relatively large, and the uniformity of the surface temperature of the motor cannot be guaranteed. Therefore, it is necessary to improve the cooling scheme of the motor and the structure of the cooling water jacket, increase the contact heat exchange surface between the cooling water and the casing water jacket, increase the convective heat transfer coefficient between the cooling water and the water jacket, and strengthen the heat dissipation at the end of the winding, so that the cooling water can Take away the heat of the stator to the greatest extent and reduce the temperature rise of the stator components.

The utility model with the patent number "CN201781377U", the application number "CN201020533083.8", and the name "a cooling water jacket for an automobile motor" discloses a cooling water jacket for an automobile motor. A water outlet and a water outlet, the cooling water jacket has a cooling water channel inside; the water inlet and the water outlet are respectively located at two ends of the cooling water channel; the cooling water channel is a plurality of parallel cooling water channels. This new type of use solves the problem of uneven heat dissipation when the angle between the water inlet and the water outlet is large, but its heat dissipation direction is uniform heat dissipation from top to bottom, and it is difficult to control the temperature rise at the end of the winding.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a cooling structure that first reduces the temperature of the motor side end, increases the heat exchange area, and improves the heat exchange coefficient between the cooling water and the water jacket.

In order to achieve the purpose of the above-mentioned utility model, a water jacket and an outer shell are provided, and flow guide ribs are arranged along the radial direction of the inner cylindrical surface of the water jacket, and the outside of the flow guide ribs is closely matched with the outer shell to form a closed cooling channel between the water jacket and the outer shell; The two ends of the cooling water channel are water inlet and water outlet. The cooling water channel includes a radial upper channel, a radial lower channel and a middle water channel. The water inlet is connected to the upper channel or the lower channel and then connected to the middle channel.

One way of water channel arrangement is that the water inlet is set on the top of the cooling structure. The cooling water channel includes a radial upper channel, a radial lower channel and a middle channel. The water inlet is connected to the starting end of the upper channel, and the upper channel passes through the axial transition. The water channel is connected to the lower channel, and then connected to the upper channel through the axial transition channel. There is a diversion point A at the end of the upper channel, and the water outlet is arranged at the lower part of the cooling structure. The middle channel is connected between the diversion point A and the water outlet.

The upper channel is annular and is not connected in the radial direction, while the lower channel is connected to the annular water channel. The upper channel is connected to the lower channel through the axial transition channel and then connected to the upper channel through the axial transition channel to form a ring. The water flow first cools the two ends of the motor along the circumferential direction, increases the temperature difference between the end of the motor stator winding and the cooling water at the end side, and facilitates the heat dissipation of the end winding. The middle water channel part of the cooling water channel is directly used to cool the stator core part.

Preferably, the central water channel is a return-type water channel unit, and the return-type water channel unit refers to a water channel unit in which two branch water channels are connected in parallel at a diverging point and merged at another diverging point.

The back-shaped waterway unit in the middle waterway is branched and merged to disturb the flow of water and achieve the purpose of good heat dissipation.

Preferably, multiple back-type water channel units are connected in series between the diversion point A and the water outlet. The distribution of the guide ribs in this part increases the contact area between the water flow and the water jacket, and the symmetrical distribution of the guide ribs makes the cooling water flow symmetrically, which improves the symmetry and uniformity of the temperature distribution of the stator core.

Preferably, the width of the side channel is greater than that of the middle channel. The sideways include upper sideways and lower sideways.

Preferably, the width of the diversion point is greater than the width of the middle channel.

Preferably, the water inlet and the water outlet are arranged on the casing.

Preferably, the water inlet is located on the motor end cover, and the water outlet is arranged on the shell.

Another waterway arrangement is that the water inlet is arranged in the middle of the cooling structure, the cooling waterway includes a radial upper side channel, a radial lower side channel and an intermediate waterway, the water inlet is located in the middle of the axial transition waterway, and is connected in parallel through the axial transition The upper side channel and the lower side channel, the upper side channel and the lower side channel merge at the diversion point A of another axial transition channel, and the middle channel is connected between the diversion point A and the water outlet.

Both the upper channel and the lower channel are ring-shaped, one end of the upper channel and the lower channel are connected to a transitional waterway with a water inlet, and the other end is connected to the first waterway and the second waterway, and the first waterway and the second waterway are connected to a transitional waterway with a diversion point A, The upper side channel, the lower side channel, the first water channel and the second water channel form a back-type water channel. The water flow first cools both ends of the motor along the circumferential direction, increasing the temperature difference between the end of the motor stator winding and the cooling water at the end side, which is beneficial to the heat dissipation of the end winding. . The middle part of the water jacket is directly used to cool the stator core. The distribution of the guide ribs in this part increases the contact area between the water flow and the water jacket. The symmetrical distribution of the guide ribs makes the cooling water flow symmetrically, which improves the symmetry of the temperature distribution of the stator core. sex and uniformity.

Preferably, the central waterway is a return-type waterway unit, and the back-type waterway unit refers to a waterway unit in which two branched waterways are connected in parallel at a branch point and merged at another branch point.

Preferably, multiple back-type water channel units are connected in series between the diversion point A and the water outlet.

Preferably, the width of the diverging point is greater than the width of the middle channel.

Preferably, the water inlet and the water outlet are arranged in the middle of the adjacent shell.

The distribution of the guide ribs of the utility model determines the cooling water channel, and the circuitous arrangement of the cooling water channel increases the length of the water flow path, increases the contact area between the cooling water and the water jacket, that is, increases the heat exchange area between the cooling water and the water jacket; the cooling water channel First lead to both ends of the water jacket, giving priority to the heat dissipation at the ends of the motor, which can greatly reduce the temperature rise at the end of the winding, prevent insulation failure caused by excessive temperature at the end, and improve the reliability of the motor operation. The circuitous path of the water flow and the split and confluence form of the water flow can improve the heat transfer coefficient between the cooling water and the water jacket.

The utility model has the beneficial effects of improving the structure of the motor cooling water jacket, reducing the temperature of the motor stator, and improving the reliability of the driving motor of the new energy vehicle.

Description of drawings

Fig. 1 is the structural representation of prior art spiral channel;

Fig. 2 is the structural representation of prior art S-shaped channel;

Fig. 3 is a structural schematic diagram of a flow-disturbing waterway in the prior art;

Fig. 4 is the schematic diagram of the cooling structure of the first embodiment of the utility model;

Fig. 5 is a rear schematic view of the cooling structure of the first embodiment of the present invention

Fig. 6 is a schematic diagram of the development of the water channel in the first embodiment of the present invention;

Fig. 7 is a schematic diagram of the flow direction of the cooling water channel in the first embodiment of the present invention;

Fig. 8 is a schematic diagram of the cooling structure of the second embodiment of the present invention;

Fig. 9 is a schematic diagram of the back side of the cooling structure of the second embodiment of the present invention;

Fig. 10 is a schematic diagram of the development of the waterway in the second embodiment of the present invention;

Fig. 11 is a schematic diagram of the flow direction of the cooling water channel in the second embodiment of the present invention;

in:

1- diversion rib 2- cooling channel 3- water inlet

4-Water outlet

detailed description

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described further.

Example 1:

According to a cooling structure shown in Figures 4 to 7, it includes a water jacket and an outer shell. The water jacket is a cylinder, and the water jacket is composed of flow guide ribs 1 upward along the radial direction of the inner cylindrical surface. The outside of the flow guide rib 1 is connected to the outer shell The close fitting installation between the water jacket and the shell forms a closed cooling water flow area, that is, the cooling water channel 2. The water inlet 3 is arranged on the top of the water jacket shell, and the water outlet 4 is arranged on the lower part of the water jacket shell. As shown in Figure 6, there are 10 water channels on the cooling water channel 2, including the upper channel, the lower channel and the middle channel, wherein the upper channel is divided into the upper channel 201 and the upper channel 202, the two are separated, and the water outlet 3 is connected to the upper channel 201, The upper channel 201 is connected to the lower channel 21 through the axial transition channel, and the lower channel 21 is connected to the upper channel 202 through the axial transition channel. There is a diversion point A at the tail end of the upper channel 202, and the channel 22 is divided into two sides at the diversion point A. The two branch waterways flow back through the waterway 23 and merge at the branch point B. The diversion point A, the water channel 22, the water channel 23 and the diversion point B are a water channel unit, forming the first back-type water channel unit. At the diversion point B, the water channel 24 branches to both sides, and flows back through the water channel 25 to merge at the diversion point C. The diversion point B, the water channel 24, the water channel 25 and the diversion point C are the second back-type water channel unit. At the diversion point C, the water channel 26 branches to both sides, and flows back through the water channel 27 to merge at the diversion point D. The diversion point C, the water channel 26, the water channel 27 and the diversion point D are the third return type water channel unit. At the branch point D, the water channel 28 branches to both sides, and flows back to the water outlet 4 through the water channel 29. The branch point D, the water channel 28, the water channel 29 and the water outlet 4 are the fourth back-type water channel unit. The four return-type waterway units together form the middle waterway. After the cooling water enters the water channel 2 from the water inlet, it first flows through both ends of the motor to enhance the heat dissipation capacity of the winding ends. The water flow path is shown in Figure 6 . In the middle of the water jacket of the motor, the water flow is divided and merged successively through the distribution of the heat-conducting flow ribs 1. The process of diversion and confluence can disturb the original flow state of the water flow and strengthen the convection heat dissipation between the cooling water and the water jacket. The width h ₁ of the side channel flowing through the ends of the water jacket is greater than the width h ₂ of the water channel in the middle of the water jacket, and the gap between the diversion ribs at each diverging point, that is, the width d ₁ of the diverging point is greater than the width h ₂ of the middle channel.

Example 2:

According to a cooling structure shown in Figures 8 to 11, it includes a water jacket and an outer shell. The water jacket is a cylinder, and the water jacket is composed of flow guide ribs 1 directed upward along the radial direction of the inner cylindrical surface. The outer side of the flow guide rib 1 is connected to the outer shell The close fitting installation between the water jacket and the shell forms a closed cooling water flow area, that is, the cooling water channel 2. The water inlet 3 and the water outlet 4 are arranged in the middle part of the water jacket shell. As shown in Figure 6, there are 10 waterways on the cooling water channel 2, and the water inlet 3 is distributed on an axial transition waterway, and is divided into two branches of the upper side channel: 210 and the lower side channel 211 at the nodes of the water inlet 3. Road, the parallel upper side channel 210 and the lower side channel 211 are merged at the branch point A of another transition waterway. At throttling point A, it is divided into water channel 212 and water channel 213 on both sides, and the parallel water channel 212 and water channel 213 are merged at diversion point B, and diversion point A, water channel 212, water channel 213 and diversion point B form the first return shape waterway unit. Divide into water channel 214 and water channel 215 at diversion point B, and the parallel water channel 214 and water channel 215 merge at diversion point C, diversion point B, water channel 214, water channel 215 and diversion point C form the second back-type water channel unit. Divide into water channel 216 and water channel 217 at diversion point C, and the parallel water channel 216 and water channel 217 merge at diversion point D, diversion point C, water channel 216, water channel 217 and diversion point D form the third back-type water channel unit. Divide into water channel 218 and water channel 219 at the branch point D, and the parallel water channel 218 and water channel 219 merge at the water outlet 4 of the branch point. Four return-type waterway units form the middle waterway.

After the cooling water enters the water jacket, it is directly divided into two channels to cool the end side respectively. Also, the distribution of the diversion rib 1 makes the water flow flow in the form of successive diversion and confluence. The water flow path is shown in Figure 6. The gap d ₃ of the flow rib 1 is greater than the channel width h ₃ .

The preferred embodiments of the utility model creation have been specifically described above, but the utility model creation is not limited to the described embodiments, and those skilled in the art can also make Various equivalent modifications or replacements are included within the scope defined by the claims of the present application.

Claims (9)

1. A cooling structure for a new energy vehicle motor, comprising a water jacket and a casing, characterized in that, along the radial direction of the inner cylindrical surface of the water jacket, there are flow guide ribs, and the outside of the flow guide ribs is closely matched with the casing so that the water jacket and the casing A closed cooling water channel is formed between the shells; the two ends of the cooling water channel are water inlets and water outlets. The cooling water channel includes a radial upper channel, a radial lower channel and a middle water channel. Central waterway connection. 2. The cooling structure of the new energy vehicle motor according to claim 1, wherein the water inlet is connected to the starting end of the upper channel, the upper channel is connected to the lower channel through an axial transition channel, and then the upper channel is connected to the upper channel through an axial transition channel There is a diversion point A at the end of the upper channel, and the water outlet is arranged at the lower part of the cooling structure, and the middle waterway is connected between the diversion point A and the water outlet. 3. The cooling structure of the electric motor for new energy vehicles according to claim 2, characterized in that, the middle water channel is a return-type water channel unit, and the return-type water channel unit refers to two branch water channels connected in parallel at the diversion point And merged waterway unit at another diversion point. 4. The cooling structure for a new energy vehicle motor according to claim 3, wherein the width of the side channel is greater than the width of the central channel. 5. The cooling structure for a new energy vehicle motor according to claim 3, wherein the width of the diversion point is greater than the width of the central water channel. 6. The cooling structure of the new energy vehicle motor according to claim 2, wherein the water inlet is arranged in the middle of the cooling structure, and the cooling water channel includes a radial upper side channel, a radial lower side channel and a middle water channel, and The water outlet is located in the middle of the axial transition water channel, and the upper side channel and the lower side channel are connected in parallel through the axial transition water channel. The upper side channel and the lower side channel are merged at the diversion point A of another axial transition channel. Central Waterway. 7. The cooling structure of the electric motor for new energy vehicles according to claim 6, characterized in that, the middle water channel is a back-shaped water channel unit, and the back-shaped water channel unit refers to two branch water channels connected in parallel at the diverging point And merged waterway unit at another diversion point. 8. The cooling structure for a new energy vehicle motor according to claim 7, wherein a plurality of back-type water channel units are connected in series between the branch point A and the water outlet. 9. The cooling structure of the new energy vehicle motor according to claim 7, characterized in that, the width of the diverging point is larger than the width of the middle channel.