CN110768464A - Motor cooling device and motor cooling method - Google Patents

Abstract

The invention provides a motor cooling device and a motor cooling method. The motor cooling device includes: a cooling cover, an inner cooling core, an outer cooling core, a circulating impeller, an inner fan and an outer fan; The core is arranged inside the cooling cover, and the outer cooling core is arranged outside the cooling cover; both the inner fan and the outer fan are arranged on the rotating shaft of the motor, wherein the inner fan is located in the casing of the motor, and the outer fan is located outside the casing of the motor; the inner fan, It is used to drive the air flow in the motor housing to pass through the stator and rotor of the motor and enter the cooling hood, and then return to the housing of the motor after passing through the inner cooling core in the cooling hood; the circulating impeller is used for cooling the inner cooling core and the outer cooling core. The cooling liquid contained in the inner is driven to make the cooling liquid circulate between the inner cooling core and the outer cooling core; the outer fan is used for cooling the cooling liquid in the outer cooling core. This solution can realize motor cooling without connecting external cooling water.

Description

Motor cooling device and motor cooling method

technical field

The invention relates to the technical field of electrical engineering, in particular to a motor cooling device and a motor cooling method.

Background technique

A motor is a device that converts electrical energy into mechanical energy as a power source for various machines. The motor will generate heat during the working process. If the heat generated by the motor cannot be dissipated in time, the motor will work abnormally or even burn out due to overheating. Therefore, the motor needs to be cooled.

At present, high-power motors are usually cooled by water cooling, that is, a fan and a water cooler are set inside the motor. Under the action of the fan, the airflow can pass through the motor heating parts and the water cooler in turn to transfer the heat generated by the motor to the water. Cooling water in the cooler, so as to achieve the purpose of cooling the motor.

In view of the current way of cooling high-power motors, the water cooler needs to be connected to external cooling water through pipes, so as to continuously provide cooling water to the water cooler through equipment such as water pumps. Since the water cooler needs to be connected to external cooling water, this motor cooling method has high requirements on the installation environment, resulting in poor applicability of this motor cooling method.

SUMMARY OF THE INVENTION

The motor cooling device and the motor cooling method provided by the embodiments of the present invention do not need to connect external cooling water.

The motor cooling device provided by the embodiment of the present invention includes: a cooling cover, an inner cooling core, an outer cooling core, a circulating impeller, an inner fan, and an outer fan;

the cooling cover communicates with the casing of the motor, the inner cooling core is arranged inside the cooling cover, and the outer cooling core is arranged outside the cooling cover;

Both the inner fan and the outer fan are arranged on the rotating shaft of the motor, wherein the inner fan is located in the casing of the motor, and the outer fan is located outside the casing of the motor;

The inner fan is used to drive the airflow in the motor housing to pass through the stator and the rotor of the motor and then enter the cooling cover, and return to the motor after passing through the inner cooling core in the cooling cover inside the shell;

the circulating impeller is used to drive the cooling liquid contained in the inner cooling core and the outer cooling core, so that the cooling liquid circulates between the inner cooling core and the outer cooling core;

The outer fan is used for cooling the cooling liquid in the outer cooling core.

Preferably,

The inner cooling core is communicated with the outer cooling core through a hot liquid transmission pipe and a cold liquid transmission pipe, and the circulation impeller is arranged on the cold liquid transmission pipe;

The total volume of the cooling liquid contained in the inner cooling core and the outer cooling core is greater than the volume of the inner cooling core;

the hot liquid transfer pipe is used for transferring the cooling liquid in the inner cooling core to the outer cooling core under the driving of the circulating impeller;

The cooling liquid transfer pipe is used for transferring the cooling liquid in the outer cooling core to the inner cooling core under the driving of the circulation impeller.

Preferably,

The cooling liquid includes: water, anhydrous cooling liquid or cooling oil.

Preferably,

the cooling cover is arranged above the motor;

The bottom of the cooling cover is provided with an air inlet and an air outlet communicating with the motor housing, wherein the air inlet and the air outlet are respectively located above both ends of the stator of the motor;

the air inlet for directing the airflow passing through the stator and rotor of the electric machine into the cooling shroud;

The air outlet is used for introducing the air flow passing through the inner cooling core into the casing of the motor.

Preferably,

The inner fan is arranged below the air inlet, and the inner fan and the outer fan are respectively located on both sides of the rotor of the motor.

Preferably,

At least one first heat dissipation rib is disposed on the outer surface of the inner cooling core, wherein the first heat dissipation rib and the rotating shaft of the motor are parallel to each other.

Preferably,

The middle part of the outer cooling core is provided with a through hole through which the rotating shaft of the motor can pass;

After the rotating shaft of the motor is passed through the through hole, the outer cooling core is arranged between the outer fan and the casing of the motor.

Preferably,

At least one second heat dissipation rib is provided on the outer surface of the outer cooling core, and the second heat dissipation rib is arranged in a horizontal direction.

Preferably,

The motor cooling device further includes: a protective cover;

The protective cover is a mesh structure;

The protective cover is respectively connected with the cooling cover and the casing of the motor, so that the outer cooling core and the outer fan are located in the protective cover.

Preferably,

The motor cooling device further includes: an additional cooling core;

the additional cooling core is located inside the housing of the electric machine;

the additional cooling cores are respectively connected with the inner cooling core and the outer cooling core;

The circulating impeller is used for driving the cooling liquid to circulate according to the flow path of the outer cooling core - the inner cooling core - the additional cooling core - the outer cooling core.

Embodiments of the present invention also provide a motor cooling method based on any of the above-mentioned motor cooling devices, including:

The inner fan is used to drive the air flow through the stator and the rotor of the electric motor, so that the air flow absorbs the heat generated by the stator and the rotor of the electric motor;

The air flow after heat absorption is driven by the inner fan to enter the cooling cover, and the air flow passes through the inner cooling core, so that the air flow transfers heat to the cooling liquid in the inner cooling core;

Use the inner fan to drive the air flow after heat release into the housing of the motor;

outputting the cooling liquid after heat absorption in the inner cooling core to the outer cooling core through the circulating impeller, and transferring the cooling liquid in the outer cooling core to the inner cooling core;

The cooling liquid in the outer cooling core is cooled by the outer fan.

In the motor cooling device and the motor cooling method provided by the embodiments of the present invention, when the motor is running, the inner fan disposed on the motor shaft drives the air flow in the motor housing to pass through the stator and rotor of the motor and then enter the cooling cover, and then enter the cooling cover. The airflow passes through the inner cooling core driven by the inner fan, exchanges heat with the cooling liquid in the inner cooling core, and then returns to the housing of the motor. At the same time, the circulating impeller drives the cooling liquid to circulate between the inner cooling core and the outer cooling core. , after the cooling liquid that absorbs heat in the inner cooling core enters the outer cooling core, the outer fan is driven by the motor to cool the cooling liquid in the outer cooling core. It can be seen that under the action of the inner fan, the air flow can circulate between the motor housing and the cooling cover, and transfer the heat generated by the motor to the cooling liquid in the inner cooling core. Under the action of the circulating impeller, the cooling liquid It can be circulated between the inner cooling core and the outer cooling core to dissipate the heat absorbed by the cooling liquid to the outside of the motor. During the cooling process of the motor, the cooling liquid is circulated by the circulating impeller and the outer fan, so there is no need to connect external cooling water. The requirements for the installation environment can be reduced.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of a motor cooling device provided by an embodiment of the present invention;

2 is a schematic diagram of another motor cooling device provided by an embodiment of the present invention;

3 is a schematic diagram of another motor cooling device provided by an embodiment of the present invention;

4 is a schematic diagram of still another motor cooling device provided by an embodiment of the present invention;

5 is a schematic diagram of a motor cooling device including a protective cover provided by an embodiment of the present invention;

6 is a schematic diagram of a motor cooling device including an additional cooling core provided by an embodiment of the present invention;

FIG. 7 is a flowchart of a method for cooling a motor provided by an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are protected by the present invention. scope.

As shown in FIG. 1 , an embodiment of the present invention provides a motor cooling device, including: a cooling cover 10 , an inner cooling core 20 , an outer cooling core 30 , a circulating impeller 40 , an inner fan 50 and an outer fan 60 ;

The cooling cover 10 is communicated with the casing of the motor 100 , the inner cooling core 20 is arranged inside the cooling cover 10 , and the outer cooling core 30 is arranged outside the cooling cover 10 ;

Both the inner fan 50 and the outer fan 60 are arranged on the rotating shaft of the motor 100, wherein the inner fan 50 is located in the casing of the motor 100, and the outer fan 60 is located outside the casing of the motor 100;

The inner fan 50 is used to drive the airflow in the housing of the motor 100 to enter the cooling cover 10 after passing through the stator and the rotor of the motor 100, and returns to the housing of the motor 100 after passing through the inner cooling core 20 in the cooling cover 10;

The circulation impeller 40 is used to drive the cooling liquid contained in the inner cooling core 20 and the outer cooling core 30, so that the cooling liquid circulates between the inner cooling core 20 and the outer cooling core 30;

The outer fan 60 is used for cooling the cooling liquid in the outer cooling core 30 .

In the motor cooling device provided by the embodiment of the present invention, when the motor is running, the inner fan disposed on the motor shaft drives the airflow in the motor housing to pass through the stator and rotor of the motor and then enter the cooling cover, and the airflow entering the cooling cover is inside the fan Driven by the inner cooling core, it exchanges heat with the cooling liquid in the inner cooling core, and then returns to the housing of the motor. At the same time, the circulating impeller drives the cooling liquid to circulate between the inner cooling core and the outer cooling core. After the cooling liquid that absorbs heat in the core enters the outer cooling core, the outer fan is driven by the motor to cool the cooling liquid in the outer cooling core. It can be seen that under the action of the inner fan, the air flow can circulate between the motor housing and the cooling cover, and transfer the heat generated by the motor to the cooling liquid in the inner cooling core. Under the action of the circulating impeller, the cooling liquid It can be circulated between the inner cooling core and the outer cooling core to dissipate the heat absorbed by the cooling liquid to the outside of the motor. During the cooling process of the motor, the cooling liquid is circulated by the circulating impeller and the outer fan, so there is no need to connect external cooling water. The requirements for the installation environment can be reduced.

Optionally, based on the motor cooling device shown in FIG. 1 , as shown in FIG. 2 , the inner cooling core 20 and the outer cooling core 30 are communicated with each other through the hot liquid transfer pipe 701 and the cold liquid transfer pipe 702 , wherein the circulating impeller 40 is arranged on the cooling liquid transmission pipe 702, and the total volume of the cooling liquid contained in the inner cooling core 20 and the outer cooling core 30 is greater than the volume of the inner cooling core 20;

Driven by the circulating impeller 40, the hot liquid transfer pipe 701 can transfer the cooling liquid in the inner cooling core 20 to the outer cooling core 30;

Driven by the circulation impeller 40 , the cooling liquid transfer pipe 702 can transfer the cooling liquid in the outer cooling core 30 to the inner cooling core 20 .

First, the inner cooling core and the outer cooling core are connected through the hot liquid transmission pipe and the cold liquid transmission pipe to form a circulation passage of the cooling liquid, so that the cooling liquid can circulate between the inner cooling core and the outer cooling core under the driving of the circulating impeller , so that the motor can be continuously cooled during the operation of the motor.

Secondly, the circulating impeller is arranged on the cooling liquid transmission pipe, and the circulating impeller extracts the low-temperature cooling liquid from the outer cooling core, and pushes the extracted low-temperature cooling liquid into the inner cooling core. At this time, the high-temperature cooling liquid in the inner cooling core will Driven by low-temperature coolant into the outer cooling core. When arranging the inner cooling core and the outer cooling core, the height of the inner cooling core is usually greater than that of the outer cooling core. At this time, the circulating impeller is arranged on the cooling liquid transmission pipe, and the circulating impeller only needs to extract the cooling liquid from the outer cooling core and Pushed into the inner cooling core, the cooling liquid in the inner cooling core can enter the outer cooling core by gravity, so that the circulating impeller with lower power can ensure the normal circulation of the cooling liquid and ensure that the power consumption for cooling the motor is low.

Secondly, the total volume of the cooling liquid contained in the inner cooling core and the outer cooling core needs to be larger than the volume of the inner cooling core, so as to ensure that the inner cooling core can be filled with the cooling liquid, which can improve the airflow through the inner cooling core and the inner cooling core. The degree to which the coolant exchanges heat, thereby improving the cooling effect of the motor. In addition, in order to reduce the power consumption of the circulating impeller, the inner cooling core and the outer cooling core can be filled with cooling liquid, so that the circulating impeller only needs to provide power to circulate the cooling liquid between the inner cooling core and the outer cooling core, without providing power to The coolant is boosted.

Optionally, based on the motor cooling device shown in FIG. 1 , the cooling liquid contained in the inner cooling core 20 and the outer cooling core 30 may be water, anhydrous cooling liquid or cooling oil.

Different types of coolants have different cooling effects and different costs. In the actual business implementation process, the corresponding type of coolant can be flexibly selected according to the heat production of the motor, so as to meet the cooling requirements and use the lower cost. Low coolant ensures low cost of cooling the motor.

Optionally, on the basis of the motor cooling device shown in FIG. 1 , as shown in FIG. 3 , the cooling cover 10 is provided above the motor 100 , and the bottom of the cooling cover 10 is provided with an air intake that communicates with the housing of the motor 100 . an air outlet 101 and an air outlet 102, wherein the air inlet 101 and the air outlet 102 are respectively located above the two ends of the stator 1002 of the motor 100;

The air inlet 101 is used to guide the airflow passing through the rotor 1001 and the stator 1002 of the motor 100 into the cooling cover 10;

The air outlet 102 is used to guide the air flow through the inner cooling core 20 into the casing of the motor 100 .

First of all, since the density of hot air is lower than that of cold air, the cooling cover is placed above the motor, and the air inlet and outlet are arranged at the bottom of the cooling cover, so that the airflow after absorbing the heat generated by the motor can enter the cooling more easily. The cover helps to improve the cooling effect of the motor.

Secondly, the air inlet and air outlet of the cooling cover are respectively arranged above the two ends of the motor stator. Under the action of the inner fan, the airflow in the motor housing can enter the cooling cover after passing through the motor rotor and stator and moving upwards. Correspondingly, after the airflow in the cooling cover enters the motor housing from the air outlet, it can pass through the rotor and the stator of the motor along the rotation axis direction of the motor. In this way, on the one hand, it ensures that the airflow passing through the rotor and stator of the motor can enter the cooling shroud as much as possible, improving the efficiency of heat exchange between the airflow and the inner cooling core, and on the other hand, it can make the airflow in the motor housing and the cooling shroud more efficient. Smooth and smooth, it can reduce the noise of the motor while ensuring the cooling effect.

Optionally, as shown in FIG. 3 , the inner fan 50 may be disposed below the air inlet 101 , and the inner fan 50 and the outer fan 60 are respectively located on both sides of the rotor 1001 of the motor 100 .

The inner fan is arranged below the air inlet. When the motor is in use, the motor drives the inner fan to rotate, and the inner fan can blow the air in the motor housing directly into the cooling cover through the air inlet, so that the air flows between the cooling cover and the motor. The circulation between the casings is smoother, which can reduce the noise generated by the inner fan while reducing the power consumption of the inner fan.

Both the inner fan and the outer fan are arranged on the shaft of the motor, and the inner fan and the outer fan are located on both sides of the motor rotor, so that when the motor drives the inner fan and the outer fan to rotate, the force on the motor shaft can be more balanced.

Optionally, based on the motor cooling device shown in FIG. 3 , as shown in FIG. 4 , at least one first heat dissipation rib 201 is provided on the outer surface of the inner cooling core 20 , and the first heat dissipation rib 201 is connected to the motor. The axes of rotation of the 100 are parallel to each other.

The first cooling ribs are arranged on the upper and lower surfaces of the inner cooling core, which can increase the contact area between the inner cooling core and the airflow, and improve the heat exchange efficiency between the airflow and the inner cooling core under the premise of a certain airflow speed, so that the airflow flows through the inner cooling core. After cooling the core, it has a lower temperature, which improves the cooling effect of the motor.

The first heat dissipation rib arranged on the outer surface of the inner cooling core is parallel to the rotating shaft of the motor, and the air inlet and the air outlet arranged on the cooling cover are respectively located above the two ends of the motor stator, namely the air inlet and the outlet. The connection line of the air port is also parallel to the rotating shaft of the motor, so that the first cooling rib can act as a guide, so that the air entering from the air inlet can flow to the air outlet in a direction parallel to the rotating shaft of the motor, so that the airflow in the cooling cover can be more stable.

It should be noted that, in the motor cooling device shown in FIG. 4 , in order to clearly reflect the structure inside the cooling cover, the top plate and the front side plate of the cooling cover are not shown.

Optionally, on the basis of the motor cooling device shown in FIG. 1 , as shown in FIG. 4 , a through hole is provided in the middle of the outer cooling core 30 , and after the rotating shaft of the motor 100 passes through the through hole, the outer cooling core 30 is arranged in the between the outer fan 60 and the housing of the motor 100 .

By setting a through hole in the middle of the outer cooling core, after the rotating shaft of the motor passes through the through hole, the outer cooling core is arranged between the motor casing and the outer fan. When the motor runs and drives the outer fan to rotate, the outer fan accelerates the outer cooling. The flow rate of the air around the core to cool the coolant in the outer cooling core. The outer cooling core is arranged between the outer fan and the motor casing, on the one hand, it can reduce the volume of the entire motor cooling device and reduce the requirements for the layout environment of the motor cooling device, and on the other hand, it can ensure that the air inlet side of the outer fan is not damaged. It is blocked to improve the cooling effect of the external fan on the external cooling core.

Optionally, as shown in FIG. 4 , one or more second heat dissipation ribs 301 are provided on the outer surface of the outer cooling core 30 , and the second heat dissipation ribs 301 are arranged in a horizontal direction.

Setting the second cooling rib on the outer surface of the outer cooling core can increase the contact area between the outer cooling core and the air, improve the heat dissipation effect of the outer cooling core, and achieve the purpose of cooling the coolant in the outer cooling core as soon as possible. Setting the second heat dissipation rib in the horizontal direction can guide the hot air blowing on the outer cooling core by the external fan to both sides of the outer cooling core in the horizontal direction, so as to avoid the hot air blowing through the outer cooling core from staying around the motor and affecting the cooling effect of the motor .

Optionally, based on the motor cooling device shown in FIG. 4 , as shown in FIG. 5 , the motor cooling device may further include: a protective cover 80 ;

The protective cover 80 has a mesh structure, and the protective cover 80 is connected to the cooling cover 10 and the housing of the motor 100 respectively, so that the outer cooling core 30 and the outer fan 60 are located in the protective cover 80 .

Connect the protective cover of the mesh structure to the cooling cover and the housing of the motor, so that the outer cooling core and the outer fan are located in the protective cover. This ensures the safety of the motor cooling device. On the other hand, the air can freely enter and exit the protective cover to ensure that the outer cooling core can dissipate heat normally.

Optionally, on the basis of the motor cooling device provided in the above embodiments, as shown in FIG. 6 , the motor cooling device may further include: an additional cooling core 90;

The additional cooling core 90 is disposed inside the casing of the motor 100, and the additional cooling core 90 is respectively connected with the inner cooling core 20 and the outer cooling core 30;

The cooling liquid contained in the inner cooling core 20 , the outer cooling core 30 and the additional cooling core 90 can be driven by the circulating impeller 40 according to the order of outer cooling core 30 - inner cooling core 20 - additional cooling core 90 - outer cooling core 30 the flow path to circulate.

When the power of the motor is large and the cooling requirements of the motor cannot be met by the inner cooling core and the outer cooling core, an additional cooling core can be set inside the motor casing, and the additional cooling core is respectively connected with the inner cooling core and the outer cooling core. The passage of cooling liquid is formed. After the cooling liquid flows out from the outer cooling core, it can enter the inner cooling core and the additional cooling core in turn and then return to the outer cooling core. In this way, in addition to the inner cooling core can exchange heat with the airflow in the cooling cover, the additional cooling core It can also exchange heat with the air flow in the housing of the motor to improve the efficiency of heat exchange between the cooling liquid and the air flow inside the motor, so as to meet the cooling requirements of the motor.

It should be noted that, in the motor cooling device provided by the above embodiments, the inner cooling core may include a plurality of cooling core units, and the cooling core units are connected in series or in parallel with each other.

As shown in FIG. 7 , an embodiment of the present invention provides a motor cooling method based on the motor cooling device provided in any of the above embodiments, and the method may include the following steps:

Step 701 : use the inner fan 50 to drive the airflow through the stator and the rotor of the motor 100 , so that the airflow absorbs the heat generated by the stator and the rotor of the motor 100 ;

Step 702: use the inner fan 50 to drive the heat-absorbing airflow into the cooling cover 10, and make the airflow pass through the inner cooling core 20, so that the airflow transfers heat to the cooling liquid in the inner cooling core 20;

Step 703 : use the inner fan 50 to drive the radiated airflow into the housing of the motor 100 ;

Step 704 : output the cooling liquid after heat absorption in the inner cooling core 20 to the outer cooling core 30 through the circulation impeller 40, and transmit the cooling liquid in the outer cooling core 30 to the inner cooling core 20;

Step 705 : Cool the cooling liquid in the outer cooling core 30 by the outer fan 60 .

In the motor cooling method provided by the embodiment of the present invention, during the operation of the motor, the inner fan drives the air flow to pass through the rotor and the stator of the motor. At this time, the air flow can absorb the heat generated by the motor stator and the rotor to become a high-temperature air flow, and then pass through the inner fan. Push the high-temperature airflow into the cooling cover. When the high-temperature airflow flows through the inner cooling core in the cooling cover, it can exchange heat with the cooling liquid in the inner cooling core to become the low-temperature airflow, and then the low-temperature airflow is returned to the inside of the motor housing through the inner fan. , so that the airflow can flow through the stator and rotor of the motor again to achieve airflow circulation. Correspondingly, the cooling liquid in the inner cooling core and the high-temperature airflow will become high-temperature cooling liquid after heat exchange. The high-temperature cooling liquid can be transported to the outer cooling core through the circulating impeller, and then the high temperature in the outer cooling core can be cooled by the outer fan. The liquid is cooled to obtain low-temperature cooling liquid, and the low-temperature cooling liquid can be transported to the inner cooling core through the circulating impeller to absorb heat again. The inner fan is used to circulate the air flow inside the cooling cover and the motor, and the circulating impeller is used to circulate the cooling liquid in the inner cooling core and the outer cooling core, and the heat generated by the motor is dissipated to the outside of the motor through the heat exchange between the air flow and the cooling liquid. To achieve the cooling of the motor, since the cooling liquid circulates in the inner cooling core and the outer cooling core, there is no need to connect external cooling water during the cooling process of the motor, thereby reducing the requirements for the installation environment of the motor cooling device.

The motor cooling device and the motor cooling method provided by the present invention have at least the following beneficial effects:

1. In the motor cooling device and the motor cooling method provided by the present invention, when the motor is running, the inner fan arranged on the motor shaft drives the airflow in the motor housing to pass through the stator and rotor of the motor and then enter the cooling cover and enter the cooling cover. Driven by the inner fan, the airflow of the cover passes through the inner cooling core, exchanges heat with the cooling liquid in the inner cooling core, and then returns to the housing of the motor. At the same time, the circulating impeller drives the cooling liquid between the inner cooling core and the outer cooling core. After the cooling liquid absorbs heat in the inner cooling core enters the outer cooling core, the outer fan is driven by the motor to cool the cooling liquid in the outer cooling core. It can be seen that under the action of the inner fan, the air flow can circulate between the motor housing and the cooling cover, and transfer the heat generated by the motor to the cooling liquid in the inner cooling core. Under the action of the circulating impeller, the cooling liquid It can be circulated between the inner cooling core and the outer cooling core to dissipate the heat absorbed by the cooling liquid to the outside of the motor. During the cooling process of the motor, the cooling liquid is circulated by the circulating impeller and the outer fan, so there is no need to connect external cooling water. The requirements for the installation environment can be reduced.

2. In the motor cooling device and the motor cooling method provided by the present invention, the total volume of the cooling liquid contained in the inner cooling core and the outer cooling core needs to be larger than the volume of the inner cooling core to ensure that the inner cooling core can be filled with the cooling liquid, and then The degree of heat exchange between the airflow flowing through the inner cooling core and the cooling liquid in the inner cooling core can be increased, so that the cooling effect of the motor can be improved. In addition, in order to reduce the power consumption of the circulating impeller, the inner cooling core and the outer cooling core can be filled with cooling liquid, so that the circulating impeller only needs to provide power to circulate the cooling liquid between the inner cooling core and the outer cooling core, without providing power to The coolant is boosted.

3. In the motor cooling device and the motor cooling method provided by the present invention, since the density of the hot air is smaller than that of the cold air, the cooling cover is arranged above the motor, and the air inlet and the air outlet are arranged at the bottom of the cooling cover. , making it easier for the airflow after absorbing the heat generated by the motor to enter the cooling cover, which helps to improve the cooling effect of the motor.

4. In the motor cooling device and the motor cooling method provided by the present invention, the air inlet and the air outlet of the cooling cover are respectively arranged above both ends of the motor stator. The rotor and stator of the motor can enter the cooling cover by moving upward after passing through. Correspondingly, the airflow in the cooling cover can pass through the rotor and stator of the motor along the direction of the rotating shaft of the motor after entering the motor housing from the air outlet. In this way, on the one hand, it ensures that the airflow passing through the rotor and stator of the motor can enter the cooling shroud as much as possible, improving the efficiency of heat exchange between the airflow and the inner cooling core, and on the other hand, it can make the airflow in the motor housing and the cooling shroud more efficient. Smooth and smooth, it can reduce the noise of the motor while ensuring the cooling effect.

5. In the motor cooling device and the motor cooling method provided by the present invention, the inner fan is arranged below the air inlet. When the motor is in use, the motor drives the inner fan to rotate, and the inner fan can pass the air inlet to the motor housing. The air is directly blown into the cooling cover, which makes the air flow more smoothly when circulating between the cooling cover and the motor housing, which can reduce the noise generated by the inner fan while reducing the power consumption of the inner fan.

6. In the motor cooling device and the motor cooling method provided by the present invention, the first cooling ribs are arranged on the upper and lower surfaces of the inner cooling core, which can increase the contact area between the inner cooling core and the air flow, and can be used under the premise of a certain air flow speed. Improve the heat exchange efficiency between the air flow and the inner cooling core, so that the air flow through the inner cooling core has a lower temperature, thereby improving the cooling effect of the motor.

7. In the motor cooling device and the motor cooling method provided by the present invention, the first cooling ribs arranged on the outer surface of the inner cooling core are parallel to the rotating shaft of the motor, and the air inlet and the air outlet are arranged on the cooling cover. They are located above both ends of the motor stator, that is, the connection between the air inlet and the air outlet is also parallel to the motor's rotating shaft, so that the first heat dissipation rib can play a guiding role, so that the air entering from the air inlet can flow along the motor. The direction parallel to the motor shaft flows to the air outlet, making the air flow in the cooling cover more stable.

8. In the motor cooling device and the motor cooling method provided by the present invention, the outer cooling core is arranged between the outer fan and the motor housing, on the one hand, the volume of the entire motor cooling device can be reduced, and the arrangement of the motor cooling device can be reduced. Environmental requirements, on the other hand, it can ensure that the air inlet side of the external fan is not blocked, which improves the cooling effect of the external fan on the external cooling core.

9. In the motor cooling device and the motor cooling method provided by the present invention, the second heat dissipation rib is arranged on the outer surface of the outer cooling core, which can increase the contact area between the outer cooling core and the air, and improve the heat dissipation effect of the outer cooling core. To achieve the purpose of cooling the coolant in the external cooling core as soon as possible. Setting the second heat dissipation rib in the horizontal direction can guide the hot air blowing on the outer cooling core by the external fan to both sides of the outer cooling core in the horizontal direction, so as to avoid the hot air blowing through the outer cooling core from staying around the motor and affecting the cooling effect of the motor .

10. In the motor cooling device and the motor cooling method provided by the present invention, when the power of the motor is relatively large and the cooling requirements of the motor cannot be met by the inner cooling core and the outer cooling core, an additional cooling core can be arranged inside the housing of the motor. , the additional cooling core is connected with the inner cooling core and the outer cooling core respectively to form the passage of the cooling liquid. After the cooling liquid flows out from the outer cooling core, it can enter the inner cooling core and the additional cooling core in turn and then return to the outer cooling core. In this way, in addition to the inner cooling In addition to the heat exchange between the core and the airflow in the cooling cover, the additional cooling core can also exchange heat with the airflow in the housing of the motor to improve the efficiency of heat exchange between the coolant and the airflow inside the motor, so as to satisfy the cooling efficiency of the motor. need.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply a relationship between these entities or operations. There is no such actual relationship or sequence. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or device that includes the element.

Finally, it should be noted that the above descriptions are only preferred embodiments of the present invention, and are only used to illustrate the technical solutions of the present invention, but not to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (11)

1. Motor cooling device, its characterized in that includes: a cooling cover (10), an inner cooling core (20), an outer cooling core (30), a circulating impeller (40), an inner fan (50) and an outer fan (60);

the cooling cover (10) is communicated with a shell of the motor (100), the inner cooling core (20) is arranged in the cooling cover (10), and the outer cooling core (30) is arranged outside the cooling cover (10);

the inner fan (50) and the outer fan (60) are both arranged on a rotating shaft of the motor (100), wherein the inner fan (50) is positioned in a shell of the motor (100), and the outer fan (60) is positioned outside the shell of the motor (100);

the inner fan (50) is used for driving the air flow in the shell of the motor (100) to pass through the stator and the rotor of the motor (100) and enter the cooling cover (10), and return to the shell of the motor (100) after passing through the inner cooling core (20) in the cooling cover (10);

the circulating impeller (40) is used for driving the cooling liquid contained in the inner cooling core (20) and the outer cooling core (30) so that the cooling liquid circulates between the inner cooling core (20) and the outer cooling core (30);

the outer fan (60) is used for cooling the cooling liquid in the outer cooling core (30).

2. The apparatus of claim 1,

the inner cooling core (20) is communicated with the outer cooling core (30) through a hot liquid delivery pipe (701) and a cold liquid delivery pipe (702), and the circulating impeller (40) is arranged on the cold liquid delivery pipe (702);

the total volume of the cooling liquid contained in the inner cooling core (20) and the outer cooling core (30) is larger than the volume of the inner cooling core (20);

the hot liquid delivery pipe (701) is used for delivering the cooling liquid in the inner cooling core (20) into the outer cooling core (30) under the driving of the circulating impeller (40);

the cold liquid conveying pipe (702) is used for conveying the cold liquid in the outer cooling core (30) to the inner cooling core (20) under the driving of the circulating impeller (40).

3. The apparatus of claim 1,

the cooling liquid includes: water, anhydrous coolant or cooling oil.

4. The apparatus of claim 1,

the cooling cover (10) is arranged above the motor (100);

an air inlet (101) and an air outlet (102) communicated with a shell of the motor (100) are formed in the bottom of the cooling cover (10), wherein the air inlet (101) and the air outlet (102) are respectively positioned above two end parts of a stator (1002) of the motor (100);

the air inlet (101) is used for guiding air flow passing through a stator (1002) and a rotor (1001) of the motor (100) into the cooling cover (10);

the air outlet (102) is used for guiding the air flow passing through the inner cooling core (20) into the shell of the motor (100).

5. The apparatus of claim 4,

the inner fan (50) is disposed below the air inlet (101), and the inner fan (50) and the outer fan (60) are respectively located on both sides of a rotor (1001) of the motor (100).

6. The apparatus of claim 4,

at least one first heat dissipation rib plate (201) is arranged on the outer surface of the inner cooling core (20), wherein the first heat dissipation rib plate (201) is parallel to the rotating shaft of the motor (100).

7. The apparatus of claim 1,

the middle part of the outer cooling core (30) is provided with a through hole through which a rotating shaft of the motor (100) can pass;

after the rotating shaft of the motor (100) passes through the through hole, the outer cooling core (30) is arranged between the outer fan (60) and the shell of the motor (100).

8. The apparatus of claim 7,

at least one second heat dissipation rib plate (301) is arranged on the outer surface of the outer cooling core (30), and the second heat dissipation rib plates (301) are arranged in the horizontal direction.

9. The apparatus of claim 7, further comprising: a protective cover (80);

the protective cover (80) is of a net structure;

the protective cover (80) is respectively connected with the cooling cover (10) and the shell of the motor (100), so that the outer cooling core (30) and the outer fan (60) are positioned in the protective cover (80).

10. The apparatus of any of claims 1 to 9, further comprising: an additional cooling core (90);

the additional cooling core (90) is located inside a housing of the electric machine (100);

the additional cooling core (90) is respectively connected with the inner cooling core (20) and the outer cooling core (30);

the circulating impeller (40) is used for driving the cooling liquid to circulate according to the flow path of the outer cooling core (30), the inner cooling core (20), the additional cooling core (90) and the outer cooling core (30).

11. A motor cooling method based on the motor cooling apparatus according to any one of claims 1 to 10, comprising:

driving an air flow through a stator and a rotor of the motor (100) with the inner fan (50) such that the air flow absorbs heat (701) generated by the stator and the rotor of the motor (100);

driving the heat-absorbed air flow into the cooling jacket (10) by the inner fan (50) and passing the air flow through the inner cooling core (20) such that the air flow transfers heat to the cooling liquid (702) in the inner cooling core (20);

driving the air flow after heat release into a shell (703) of the motor (100) by using the inner fan (50);

outputting the coolant liquid absorbing heat in the inner cooling core (20) into the outer cooling core (30) through the circulating impeller (40), and transferring the coolant liquid in the outer cooling core (30) into the inner cooling core (20) (704);

cooling (705) the coolant in the outer cooling core (30) by the outer fan (60).

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