CN115296470A - Integrated liquid-cooled motor and cooling system - Google Patents

Abstract

The invention relates to the technical field of motor heat dissipation, in particular to an integrated liquid-cooled motor and a cooling system, and aims to solve the problems that the weight of a motor system is increased and the reliability is reduced due to the fact that a motor cooling liquid is connected with a secondary cooling system due to cooling requirements. The invention provides an integrated liquid cooling motor, comprising: the device comprises a machine shell cylinder, a return flow channel arranged on the periphery of the machine shell cylinder and a connecting shaft pump arranged at the end part of the machine shell cylinder; the medium flows to the return flow channel through the connecting shaft pump and then flows back to the connecting shaft pump through the return flow channel. The integrated liquid-cooled motor provided by the invention does not need external secondary cooling equipment to radiate the cooling liquid, thereby reducing the complexity of the whole structure.

Description

Integrated liquid-cooled motor and cooling system

technical field

The invention relates to the technical field of motor heat dissipation, in particular to an integrated liquid-cooled motor and a cooling system.

Background technique

Due to its small size, light weight, high output power and many other advantages, high power density motors have gradually become the mainstream of development in the fields of aircraft, ships, and high-speed rail. However, the efficient heat dissipation of motors has become one of the key technologies restricting the development of motors in the direction of high power density. In order to improve the power density of the motor, it is necessary to control the temperature rise parameters of the motor to ensure the reliable and efficient operation of the motor.

At present, the cooling methods of motors are generally divided into air cooling and liquid cooling. Air cooling mainly dissipates heat through the casing, which is suitable for small-power motors. For motors with high power density, the cooling capacity of the air cooling method is poor, and the efficiency and service life of the motor will be reduced due to overheating. Liquid cooling mainly uses coolant circulation and casing heat dissipation, which has a better heat dissipation capability than air cooling. Therefore, high power density motors usually choose liquid cooling for heat dissipation.

In the existing liquid cooling technology, the cooling channel is generally set inside the motor casing or the motor. The inlet and outlet of the channel need to be connected with the external secondary cooling system, and the cooling liquid flowing out of the channel requires external heat exchange. Secondary cooling by means of a device or secondary coolant. Such a design requires the motor to be equipped with cooling system equipment such as heat exchangers, water tanks, pipes, pumps, etc., which not only increases the volume and weight of the motor system, but also makes the system more complicated and less reliable due to the large number of components. Therefore, the motor coolant is connected to the secondary cooling system due to the need for cooling, which will cause the problems of increased weight and reduced reliability of the motor system.

Contents of the invention

The object of the present invention is to provide an integrated liquid-cooled motor and a cooling system to solve the problem that the motor cooling fluid is connected to the secondary cooling system due to cooling requirements, resulting in increased weight and reduced reliability of the motor system.

In order to solve the above technical problems, the technical solution provided by the invention is:

In the first aspect, the integrated liquid-cooled motor provided by the present invention includes: a casing cylinder, a turn-back flow channel arranged on the outer periphery of the casing cylinder, and a coupling pump arranged at the end of the casing cylinder;

The medium flows through the coupling pump to the return channel, and then flows back to the coupling pump from the return channel.

In an alternative embodiment,

A cooling channel is also provided outside the casing cylinder;

The inlet end of the cooling channel communicates with the coupling pump, and the outlet end of the cooling channel communicates with the return channel;

The medium flows to the cooling flow channel through the coupling pump, and then flows from the cooling flow channel to the return flow channel.

In an alternative embodiment,

The turn-back flow channel is provided with two layers of flow channels, and the turn-back flow channel includes an input flow channel close to the cylinder side of the housing and an output flow channel close to the air side;

The medium flow direction of the input channel is opposite to the medium flow direction of the output channel.

In an alternative embodiment,

The return channel at least includes a first chamber near the cylinder side of the casing and a second chamber near the air side;

The first chamber and the second chamber are physically separated, an input channel is formed in the first chamber, and an output channel is formed in the second chamber.

In an alternative embodiment,

A plurality of main fins are axially arranged on the outside of the shell cylinder, and the turning-back channel is arranged inside the main fins.

In an alternative embodiment,

A plurality of additional fins extending in the axial direction are provided on both sides of the main fin, and the plurality of additional fins are arranged at intervals in the radial direction, and the additional fins are arranged at an angle to the main fin and adjacent to each other There is a gap between the two additional fins.

In an alternative embodiment,

The shaft-coupled pump and the convex groove of the motor end cover are arranged in tight engagement.

In an alternative embodiment,

The integrated liquid-cooled motor also includes a coaxial fan, and the coaxial fan is arranged outside the coupling pump;

The coaxial fan and the motor shaft with one side of the coupling pump are arranged in tight engagement.

In an alternative embodiment,

The fan cover is tightly engaged with the end of the housing cylinder on the side where the coupling pump and the coaxial fan are installed.

In the second aspect, the cooling system provided by the present invention includes the integrated liquid-cooled motor.

Comprehensive above-mentioned technical scheme, the technical effect that the present invention can realize is:

The integrated liquid-cooled motor provided by the present invention includes: a casing cylinder, a turnback flow channel arranged on the outer periphery of the casing cylinder, and a coupling pump arranged at the end of the casing cylinder; the medium flows to the turnback flow through the coupling pump channel, and then return to the coupling pump through the return flow channel.

By arranging the return channel on the outer circumference of the casing cylinder and setting the coupling pump at the end of the casing cylinder, the medium flows to the return channel through the coupling pump, and then flows back to the coupling shaft from the return channel The pump uses a coupling pump to push the medium to circulate in a specific flow channel, so that the heat is effectively absorbed by the medium, which improves the heat dissipation efficiency of the motor, and no longer requires external secondary cooling equipment to dissipate heat from the medium, which strengthens the medium and The heat exchange function of the shell cylinder also reduces the complexity of the overall structure, and solves the problem that the motor coolant is connected to the secondary cooling system due to cooling needs, which causes the weight of the motor system to increase and the reliability to decrease.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

FIG. 1 is a schematic diagram of the overall structure of an integrated liquid-cooled motor provided by an embodiment of the present invention;

Fig. 2 is a schematic axial sectional view of the integrated liquid-cooled motor in Fig. 1;

Figure 3 is a flow diagram of the medium inside the main fin;

Fig. 4 is a radial cross-sectional schematic diagram of the integrated liquid-cooled motor in Fig. 1;

Figure 5 is an enlarged view of the main fin structure.

Icons: 10-casing cylinder; 20-return channel; 30-coaxial pump; 40-cooling channel; 50-main fin; 60-additional fin; 70-motor end cover; 80-coaxial fan ; 90-motor shaft; 100-fan cover; 110-stator core; 120-stator winding; 130-rotor core.

Detailed ways

In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Some embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

In the existing liquid cooling technology, the cooling channel is generally set inside the motor casing or the motor. The inlet and outlet of the channel need to be connected with the external secondary cooling system, and the cooling liquid flowing out of the channel requires external heat exchange. Secondary cooling by means of a device or secondary coolant. Such a design requires the motor to be equipped with cooling system equipment such as heat exchangers, water tanks, pipes, pumps, etc., which not only increases the volume and weight of the motor system, but also makes the system more complicated and less reliable due to the large number of components. Therefore, the motor coolant is connected to the secondary cooling system due to the need for cooling, which will cause the problems of increased weight and reduced reliability of the motor system.

In view of this, the present invention provides an integrated liquid-cooled motor, which includes: a casing cylinder 10, a return channel 20 arranged on the outer periphery of the casing cylinder 10, and a connecting shaft arranged at the end of the casing cylinder 10 Pump 30 ; the medium flows through the coupling pump 30 to the return channel 20 , and then returns to the coupling pump 30 from the return channel 20 .

By arranging the turnback flow channel 20 on the outer circumference of the casing cylinder 10, and setting the coupling pump 30 at the end of the casing cylinder 10, the medium flows to the turnback flow path 20 through the coupling pump 30, and then the turnback flow The channel 20 returns to the coupling pump 30, and the coupling pump 30 is used to push the medium to circulate in a specific flow channel, so that the heat is effectively absorbed by the medium, which improves the heat dissipation efficiency of the motor, and no longer requires external secondary cooling equipment Heat dissipation of the medium enhances the heat exchange effect between the medium and the casing cylinder 10, and also reduces the complexity of the overall structure, solving the problem of motor coolant being connected to the secondary cooling system due to cooling requirements, resulting in an increase in the weight of the motor system , The problem of reduced reliability.

The structure and shape of the integrated liquid-cooled motor provided in this embodiment will be described in detail below with reference to FIGS. 1 to 5 .

Regarding the shape and structure of the turning channel 20, in detail:

As shown in Figures 2 and 3, the return flow channel 20 is arranged on the outer periphery of the casing cylinder 10, and the return flow channel 20 is located inside the main fin 50, and the return flow channel 20 includes at least the first chamber near the casing cylinder 10 side. The first chamber is physically separated from the second chamber near the air side, and the first chamber forms an input flow channel, and the second chamber forms an output flow channel.

For example, the reentrant flow channel 20 includes two layers of flow channels, the first layer of flow channel is the input flow channel, and the second layer of flow channel is the output flow channel. It is the opposite; for another example, the direction of the arrow shown in Figure 2 is the flow path of the medium, if the return flow channel 20 includes three layers of flow channels, the first layer of flow channels is the output flow channel, and the third layer of flow channels is the output flow channel. In the flow channel, the medium flows in from the input channel and finally flows out from the output channel. In this case, the flow direction of the medium in the input channel is the same as that in the output channel. That is, when the number of channels is odd (the number of channels is greater than two), the flow direction of the medium in the input channel is the same as that in the output channel. When the number of channels is even, the flow direction of the medium in the input channel is the same. It is opposite to the medium flow direction in the output channel. Of course, the above is an example to illustrate the number of flow channels in the reentrant flow channel 20 . The reentrant flow channel 20 is a multi-layer flow channel, and the number of flow channel layers in the reentrant flow channel 20 can be specifically set according to actual needs.

Further, the medium is cooling liquid, and in some preferred embodiments, the cooling liquid can be water-cooled or oil-cooled.

In order to fill the closed circuit with cooling liquid and ensure that the closed circuit is completely filled with cooling liquid, this embodiment is also provided with a cooling channel 40 .

Regarding the shape and structure of the cooling channel 40, in detail:

The cooling channel 40 is arranged on the outside of the casing cylinder 10, the inlet end of the cooling channel 40 communicates with the outlet of the coupling pump 30, the coupling pump 30 is arranged at the end of the casing cylinder 10, and the cooling channel 40 The outlet end of the outlet port is in communication with the return channel 20.

Further, the cooling liquid flows through the coupling pump 30 to the cooling flow channel 40, and then flows from the cooling flow channel 40 to the turn-back flow channel 20, after that, the cooling liquid enters from the input flow channel and flows out from the output flow channel, and the output flow channel and the coupling shaft The inlets of the pump 30 are connected. Therefore, the coupling pump 30 , the cooling flow channel 40 and the turn-back flow channel in the main fin 50 form a closed and connected circuit, and the cooling liquid can be filled in the closed circuit.

A plurality of main fins 50 are arranged in the outer axial direction of the casing cylinder 10. Regarding the shape and structure of the main fins 50, in detail:

As shown in Fig. 1, Fig. 4 and Fig. 5, a plurality of additional fins 60 extending in the axial direction are respectively arranged on both sides of the main fin 50, and the plurality of additional fins 60 are radially spaced apart, and the additional fins 60 are connected to the main fins. The fins 50 are arranged at a certain angle, and the multiple axial additional fins 60 on the same side are arranged in a certain positional relationship, specifically, there is a gap between two additional fins 60 adjacent in the transverse direction.

Regarding the shape and structure of the motor end cover 70, the coupling pump 30 and the coaxial fan 80, in detail:

Both ends of the motor shaft 90 are connected with a motor end cover 70, and the coupling pump 30 is arranged on one side of the motor shaft 90, and the coupling pump 30 and the motor end cover 70 are tightly engaged, and the motor connected to the coupling pump 30 The end cover 70 has a protruding groove in the direction towards the coupling pump 30 , and the coupling pump 30 is tightly engaged with the convex groove.

Further, a coaxial fan 80 is provided on the outside of the coaxial pump 30, the coaxial fan 80 can be set in a conical shape, and the coaxial fan 80 and the motor shaft 90 on the side with the coaxial pump 30 are arranged in close engagement, and The coaxial fan 80 is arranged coaxially with the motor shaft 90 , and the inner diameter of the coaxial fan 80 is tapered away from the coupling pump 30 .

Further, the fan cover 100 is tightly engaged with the end of the casing cylinder 10 on the side where the coaxial pump 30 and the coaxial fan 80 are installed. Specifically, the outer cover of the coaxial fan 80 is provided with a fan cover 100 , the end of the motor shaft 90 close to the coaxial fan 80 is disposed inside the fan cover 100 .

Furthermore, the end of the motor shaft 90 away from the coaxial fan 80 is also provided with a motor end cover 70 , and the end of the motor shaft 90 away from the coaxial fan 80 protrudes from the motor end cover 70 .

The interior of this embodiment is provided with a rotor core 130, which is connected to the motor shaft 90, and the outside of the rotor core 130 is provided with a stator core 110 and a stator winding 120. The internal cooling method of this embodiment is liquid cooling, and there are various Forms, such as the casing is provided with runners to dissipate heat, the interior of the motor is cooled by oil injection, and the stator core 110 is provided with runners to dissipate heat and other cooling methods. When the motor is running, the coaxial fan 80 rotates synchronously with the rotation of the rotor, and the generated flowing air blows to the main fin 50 and the additional fin 60 .

The working process of the integrated liquid-cooled motor provided in this embodiment is as follows:

This embodiment integrates the way of integrated secondary air cooling, as shown in Figure 2 and Figure 3, the coolant circulation path is marked with a black arrow. The coolant flows out from the coupling pump 30 first through the cooling flow channel 40, and then enters the input flow channel of the main fin 50 near the casing cylinder 10, and then flows through the multi-layer flow channel. The switchback movement is performed in the switchback flow channel, and finally flows out from the outlet of the output flow channel and enters the coupling pump 30, forming a complete cycle. During this period, due to the rotation of the rotor, the coaxial fan 80 has played a role of forced air cooling and heat dissipation on the main fin 50 and the additional fin 60, reducing the temperature of the main fin 50 and the additional fin 60, thereby reducing the temperature of the main fin 50 and the additional fin 60. 50 The temperature of the cooling liquid in the return type flow channel, that is, it plays a role in cooling the cooling liquid.

Specifically, the coupling pump 30 is used to push the coolant to circulate in a specific flow channel, so that the heat generated by the motor stator is effectively absorbed by the coolant, thereby enhancing the heat exchange capacity between the coolant and the motor casing, and enhancing the The heat dissipation efficiency of the motor casing. Moreover, this embodiment does not require external secondary cooling equipment to dissipate heat from the cooling liquid, which reduces the complexity of the overall structure and reduces the cost of production and installation.

Further, in this embodiment, there are two cooling processes without the need for external secondary cooling equipment, and the axial sectional view of the motor in FIG. 2 is taken as an example for illustration. Firstly, the coupling pump 30 pushes the coolant to flow through the cooling channel 40 to absorb the heat generated by the motor stator core 110 and the stator winding 120; When passing through the turn-back type flow channel in the main fin 50 of the motor, the heat in the cooling liquid is transferred to the main fin 50 and the additional fins 60 around it again, and then the flowing air generated by the coaxial fan 80 is applied to the main fin 50. and additional fins 60 for forced air cooling to achieve the purpose of reducing the temperature of the coolant. Among them, the multiple additional fins 60 around the main fin 50 greatly increase the heat dissipation area of the casing, making the forced air cooling more sufficient. Moreover, the cooled coolant flows out from the main fins 50 and flows back to the coupling pump 30. Due to the existence of the coupling pump 30, the coolant can form a cooling circulation loop inside the motor, so that the motor can effectively and continuously dissipate heat.

Further, in this embodiment, the main fins 50 and the additional fins 60 are integrated with the shell cylinder 10, and the fins can still dissipate heat without liquid circulation. The heat inside the motor is transferred to the casing cylinder 10 through the iron core, and the casing cylinder 10 then transfers the heat to the main fins 50 and the additional fins 60 . The coaxial fan 80 still plays the role of forced air cooling and heat dissipation on the main fins 50 and the additional fins 60 . Although there is no coolant circulation to dissipate heat, the cooling performance will be reduced, but it can still meet the reduced load operation of the motor.

Since the technical effect of the cooling system provided in this embodiment is the same as that of the integrated liquid-cooled motor provided in the above embodiment, details are not repeated here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. An integrated liquid-cooled motor, characterized in that it comprises: a casing cylinder (10), a return channel (20) arranged on the outer periphery of the casing cylinder (10), and a turn-back channel (20) arranged on the casing A coupling pump (30) at the end of the cylinder (10); The medium flows through the coupling pump (30) to the return channel (20), and then returns to the coupling pump (30) from the return channel (20). 2. The integrated liquid-cooled motor according to claim 1, characterized in that, A cooling channel (40) is also provided outside the casing cylinder (10); The inlet end of the cooling channel (40) communicates with the coupling pump (30), and the outlet end of the cooling channel (40) communicates with the return channel (20); The medium flows to the cooling channel (40) through the coupling pump (30), and then flows from the cooling channel (40) to the return channel (20). 3. The integrated liquid-cooled motor according to claim 1, characterized in that, The turnback flow channel (20) is provided with two layers of flow channels, and the turnback flow channel (20) includes an input flow channel close to the casing cylinder (10) side and an output flow channel close to the air side; The medium flow direction of the input channel is opposite to the medium flow direction of the output channel. 4. The integrated liquid-cooled motor according to claim 1, characterized in that, The return channel (20) at least includes a first chamber near the casing cylinder (10) side and a second chamber near the air side; The first chamber and the second chamber are physically separated, an input channel is formed in the first chamber, and an output channel is formed in the second chamber. 5. The integrated liquid-cooled motor according to claim 1, characterized in that, A plurality of main fins (50) are axially arranged on the outside of the casing cylinder (10), and the return channel (20) is arranged inside the main fins (50). 6. The integrated liquid-cooled motor according to claim 5, characterized in that, Both sides of the main fin (50) are provided with a plurality of additional fins (60) extending axially, and the plurality of additional fins (60) are radially spaced apart, and the additional fins (60) and The main fins (50) are arranged at an angle, and there is a gap between two laterally adjacent additional fins (60). 7. The integrated liquid-cooled motor according to claim 1, characterized in that, The shaft-coupled pump (30) and the convex groove of the motor end cover (70) are arranged in tight engagement. 8. The integrated liquid-cooled motor according to claim 1, further comprising a coaxial fan (80), the coaxial fan (80) being arranged outside the coupling pump (30); The coaxial fan (80) and the motor shaft (90) with one side of the coupling pump (30) are arranged in tight engagement. 9. The integrated liquid-cooled motor according to claim 8, characterized in that, The fan cover (100) is tightly engaged with the end of the casing cylinder (10) on the side where the coaxial pump (30) and the coaxial fan (80) are installed. 10. A cooling system, characterized by comprising the integrated liquid-cooled motor according to any one of claims 1-9.

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