CN202094716U - Stator heat radiation structure of flywheel energy storage system and flywheel energy storage system - Google Patents

Abstract

A flywheel energy storage system stator heat dissipation structure and a flywheel energy storage system, the heat dissipation structure includes an annular flat stator, a cooling cavity, a cooling liquid located in the cooling cavity and a heat transfer device, the heat transfer device is arranged on the cooling cavity or on the The side wall of the cooling chamber includes the circumferential surface of the stator, the wires of the stator located on the circumference of the stator are exposed on the circumferential surface, and the structure connected to the heat dissipation structure is insulated from the wires; the system includes a disc-shaped stator, a rotor and The casing and the stator are connected inside the casing, the rotor and the side surfaces of the stator are adjacent, and the rotor is rotatably supported on the casing. The utility model is provided with a cooling cavity, through which the cooling liquid flowing through the cooling cavity realizes cooling of the exposed wires on the annular peripheral surface of the stator, and the heat of the internal wires of the stator is conducted to the peripheral surface of the stator to realize cooling, thereby improving the cooling effect of the stator and satisfying the requirements of high-power flywheels. The cooling requirements of the stator of the energy storage system; the structure is simple and the cooling efficiency is high.

Description

A stator heat dissipation structure of a flywheel energy storage system and a flywheel energy storage system

technical field

The utility model relates to a stator heat dissipation structure of an energy storage system, and also relates to an energy storage system, in particular to a stator heat dissipation structure of a flywheel energy storage system and a flywheel energy storage system using the structure.

Background technique

The flywheel energy storage system is a common system that uses the characteristics of the flywheel motor to freely convert mechanical energy and electrical energy to store system energy. Such as single-rotor single-stator disc permanent magnet motor, double-rotor single-stator disc permanent magnet motor, etc., which have the advantages of no iron core in the stator, no ferromagnetic loss, and high efficiency.

However, in some flywheel energy storage systems such as double-rotor single-stator disc permanent magnet motor structure, since the stator disc is tightly clamped between the two rotor discs, the gap is very small, and the convective heat transfer is extremely inconvenient, especially in the disc type In the flywheel battery, since the inside of the battery case is usually evacuated, there is no convection heat dissipation at all, and the heat dissipation conditions of the stator are more difficult.

As shown in FIG. 1 , the middle part 9 of the stator disk 10 is an electromagnetic action area, and no other conductive substances can be placed in this area except copper wires. Therefore, the stator disk 10 is usually made of epoxy resin as a matrix, and all the copper wires are sealed and fixed to form a thin disk. Due to the extremely low thermal conductivity of epoxy resin, only 0.2W/(m*K), its heat transfer capacity is extremely low.

In order to improve the heat dissipation capacity of the stator of the flywheel energy storage system, the method of adding heat-conducting insulating powder such as aluminum nitride to the epoxy resin is generally used to improve the thermal conductivity of the epoxy resin matrix.

However, the stator heat dissipation structure of the existing flywheel energy storage system still has the following defects:

1. After the epoxy resin is added with aluminum nitride and other heat-conducting insulating powders, the thermal conductivity can only be increased from 0.2W/(m*K) to about 2W/(m*K), which still cannot meet the needs of high-power flywheel storage. Heat dissipation requirements of the energy system stator;

2. The process of adding thermally conductive insulating powder to epoxy resin is relatively complicated, and it is difficult to mix evenly, resulting in uneven thermal conductivity of epoxy resin, and it is difficult to ensure reliable heat dissipation of the stator of the flywheel energy storage system.

Utility model content

One of the technical problems to be solved by the utility model is to provide a stator heat dissipation structure of the flywheel energy storage system, which solves the defects that the stator heat dissipation of the existing flywheel energy storage system is difficult and cannot meet the stator heat dissipation requirements of the high-power flywheel energy storage system.

The second technical problem to be solved by the utility model is to provide a flywheel energy storage system, which solves the defects that the stator of the existing flywheel energy storage system is difficult to dissipate heat and cannot meet the heat dissipation requirements of the stator of the high-power flywheel energy storage system.

The technical solution adopted by the utility model to solve one of its technical problems is to construct a stator heat dissipation structure of the flywheel energy storage system, which is characterized in that it includes an annular flat stator, a cooling cavity, a cooling liquid and a heat sink located in the cooling cavity A transmission device, the heat transmission device is arranged on or in the cooling cavity and leads out of the cooling cavity, the side wall of the cooling cavity includes the circumferential surface of the stator, and the stator is located on the wire on the circumference of the stator Exposed on the circumferential surface, the structure connected to the heat dissipation structure is insulated from the wire.

In the stator heat dissipation structure of the flywheel energy storage system of the present invention, the heat transfer device includes a cooling pipe arranged in the cooling cavity and leading out of the cooling cavity, and a flowing cooling liquid A located in the cooling tube;

Or the heat transfer device includes a heat conductor arranged in the cooling cavity and leading out of the cooling cavity.

In the heat dissipation structure of the stator of the flywheel energy storage system of the present utility model, the heat transfer device includes a liquid inlet pipe and a liquid outlet pipe connected to the cooling cavity, and the cooling liquid is an insulating cooling liquid.

In the heat dissipation structure of the stator of the flywheel energy storage system of the present invention, the cooling cavity is constituted according to the following structure: the heat dissipation structure includes an inner surface of the housing of the flywheel energy storage system corresponding to the installation position of the stator and connected to the stator. An annular boss at intervals on the top surface of the circumference, an annular plate A and an annular plate B corresponding to the annular boss and the stator, and the annular plate A and the annular plate B are correspondingly sealed and connected between the annular boss and the stator The two side surfaces of the ring form a cooling cavity, and the annular boss is insulated from the stator.

In the heat dissipation structure of the stator of the flywheel energy storage system of the present invention, the liquid inlet pipe and the liquid outlet pipe are arranged on the side wall of the flywheel energy storage system shell corresponding to the position of the annular boss or pass through the ring of the stator. The board is led out from the upper and lower end covers of the system housing.

The technical solution adopted by the utility model to solve the second technical problem is: to construct a flywheel energy storage system, including an annular flat stator, a disk-shaped rotor and a housing, the stator is connected to the inside of the housing, and the The side surface of the rotor is adjacent to the side surface of the stator, the rotor is rotatably supported on the housing, and it is characterized in that it includes a stator heat dissipation structure, and the stator heat dissipation structure includes an annular flat stator, a cooling cavity, and is located in the cooling cavity The cooling liquid and the heat transmission device, the heat transmission device is arranged on or in the cooling cavity and leads out of the cooling cavity, the side wall of the cooling cavity includes the circumferential surface of the stator, and the stator The wires located on the circumference of the stator are exposed on the circumference, and the structure connected to the heat dissipation structure is insulated from the wires. The stator is connected to the housing through the cooling chamber component, and the stator is connected to the housing. insulated.

In the flywheel energy storage system of the present utility model, the heat transfer device includes a cooling pipe arranged in the cooling chamber and leading out of the cooling chamber and a flowing cooling liquid located in the cooling pipe;

Or the heat transfer device includes a heat conductor arranged in the cooling cavity and leading out of the cooling cavity.

In the flywheel energy storage system of the present invention, the heat transfer device includes a liquid inlet pipe and a liquid outlet pipe connected to the cooling chamber, and the cooling liquid is insulating cooling liquid.

In the flywheel energy storage system of the present utility model, the cooling cavity is structured as follows: the heat dissipation structure includes an annular protrusion arranged on the inner surface of the housing corresponding to the installation position of the stator and spaced from the circumferential top surface of the stator. Platform, corresponding to the annular boss and the annular plate A and the annular plate B of the stator, the annular plate A and the annular plate B are correspondingly sealed and connected to the two side surfaces of the annular boss and the stator to form a cooling chamber , there is insulation between the annular boss and the stator.

In the flywheel energy storage system of the present utility model, the liquid inlet pipe and the liquid outlet pipe are arranged on the side wall of the housing corresponding to the position of the annular boss or from the upper and lower sides of the system housing through the annular plate of the stator. end cap out.

Compared with the prior art, the stator cooling structure of the flywheel energy storage system and the flywheel energy storage system implementing the utility model have beneficial effects as follows:

1. By setting the cooling chamber to make the cooling liquid contact with the surface of the exposed wires on the circumferential surface of the stator to conduct heat conduction, and then through the cooling device, the liquid cooling liquid in the cooling chamber can cool the exposed wires on the circumferential surface of the stator. The heat of the internal wires of the stator is passed through Wire conduction and coolant heat exchange to achieve cooling, greatly improving the cooling effect of the stator, and meeting the cooling requirements of the stator of the high-power flywheel energy storage system;

2. Simple structure and high cooling efficiency;

3. Simple installation and low cost.

Description of drawings

The utility model will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a structural sectional view of the stator in the stator cooling structure of the flywheel energy storage system of the present invention.

Fig. 2 is a sectional view of an embodiment of the flywheel energy storage system of the present invention.

Fig. 3 is an enlarged view of part A in Fig. 2 .

Fig. 4 is a cross-sectional view of another embodiment of the flywheel energy storage system of the present invention.

Fig. 5 is a cross-sectional view of another embodiment of the flywheel energy storage system of the present invention.

Fig. 6 is a cross-sectional view of another embodiment of the flywheel energy storage system of the present invention.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, the stator heat dissipation structure of the flywheel energy storage system of the present invention includes an annular flat stator 10, a cooling chamber 40, a cooling liquid (not shown in the figure) located in the cooling chamber and The heat transport device is arranged on or in the cooling cavity 40 and leads out of the cooling cavity 40 . The sidewall of cooling cavity 40 comprises the circumferential surface 11 of stator 10 (cooling cavity 40 can comprise the whole circumferential surface 11 of stator 10, also can only comprise the exposed wire 11 of stator circumferential surface of partial circumference of stator 10), and stator 10 is in stator circumferential surface The wires above are exposed on the peripheral surface 11. The structure connected with the heat dissipation structure of the stator of the flywheel energy storage system is insulated from the wires of the stator.

In this embodiment, the heat transmission device adopts the following structure, and the structure connected to the heat dissipation structure of the stator of the flywheel energy storage system is insulated from the wires of the stator: the heat transmission device includes a liquid inlet pipe 70 connected to the cooling cavity 40 and a liquid outlet pipe Pipe 80 (as shown in FIG. 4 ), the cooling liquid adopts insulating cooling liquid.

In other embodiments, the heat transmission device may adopt a structure including but not limited to the following, and realize the insulation between the structure connected to the heat dissipation structure of the stator of the flywheel energy storage system and the wires of the stator:

1. As shown in FIG. 5 , the heat transfer device includes a cooling pipe 90 arranged in the cooling chamber and leading out of the cooling chamber, and a second cooling liquid flowing in the cooling pipe 90 . The insulation between the structure connected to the heat dissipation structure of the stator of the flywheel energy storage system and the wires of the stator can be insulated: the cooling liquid in the cooling chamber is an insulating cooling liquid, and the cooling pipe 90 is insulated from the wires; or the cooling pipe 90 is made of thermally conductive insulating material; Or the second cooling liquid is an insulating cooling liquid, and the cooling pipe 90 is insulated and connected to the external structure.

2. The heat transmission device includes a heat conductor arranged in the cooling chamber and leading out of the cooling chamber. The structure connected to the heat dissipation structure of the stator of the flywheel energy storage system and the wire insulation of the stator can be used: the heat conductor is insulated from the wires of the stator, and the cooling The cooling liquid in the cavity is made of insulating cooling liquid; or the heat conductor is made of heat-conducting insulating material, etc.

In the present embodiment, the cooling cavity 40 adopts the following structure: the heat dissipation structure includes an annular boss 31, an annular plate 50 and an annular plate 60 arranged on the inner surface of the flywheel energy storage system housing 30, and the annular boss 31 corresponds to the stator 10 and spaced from the circumferential top surface 11 of the stator 10 (in order to increase the volume of the cooling cavity 40 and improve the heat dissipation efficiency, a groove is provided on the annular boss 31), the annular plate 50 and the annular plate 60 correspond to the annular The boss 31 cooperates with the side surface of the stator 10, and the sealing material in the sealing groove 51, 61 is sealed and connected to form a cooling chamber 40 on both sides of the annular boss 31 and the stator 10, and the annular boss 31 is insulated from the stator 10. (The annular plate 50 and the annular plate 60 can be made of insulating material to realize insulation, and the insulating sealing material in the sealing grooves 51, 61 can also be used to realize insulation).

In other embodiments, the cooling chamber 40 can be constructed with other structures, such as an annular sealing sleeve whose two sides are sealed with the surfaces of both sides of the stator 10. After the stator 10 is sealed with the sealing sleeve, it is then insulated and connected to the flywheel The inner surface of the energy storage system casing 30 and the like.

The liquid inlet pipe and the liquid outlet pipe can be arranged on the side wall of the flywheel energy storage system shell corresponding to the position of the annular boss 31, and can also be arranged at other positions of the flywheel energy storage system shell according to the structural requirements, such as the liquid inlet pipe And the liquid outlet pipe is arranged on the annular plate 50 and the annular plate 60, and is led out from the upper and lower side walls of the housing of the flywheel energy storage system, which can also achieve the purpose of the present invention.

The flywheel energy storage system of the utility model includes an annular flat stator, a disk-shaped rotor and a casing, the stator is connected inside the casing, the side surface of the rotor is installed adjacent to the side surface of the stator, and the rotor is rotatably supported on the casing. The stator adopts the above heat dissipation structure for heat dissipation, and the structure is as above. The stator is connected to the casing through the cooling cavity component of the heat dissipation structure, and the insulation between the stator and the casing is ensured.

As shown in Figure 2, the flywheel energy storage system of this embodiment includes an annular flat stator 10, two disc rotors 20 and a motor housing 30, the stator 10 is connected to the motor housing through a cooling cavity member of a heat dissipation structure Inside the body 30 , the rotor 20 is located on both sides of the stator 10 and rotatably supported on the housing 30 .

In other embodiments, the number of stators and rotors can be set according to needs, such as the structure of one annular flat stator and one disc rotor, or the structure of two annular flat stators and three disc rotors, etc. , can realize the object of the present invention.

Fig. 6 is an embodiment of the flywheel motor using the stator cooling structure of the flywheel energy storage system of the present invention.

Claims (10)

1. A heat dissipation structure for a stator of a flywheel energy storage system, characterized in that it comprises an annular flat stator, a cooling chamber, a cooling liquid located in the cooling chamber and a heat transfer device, and the heat transfer device is arranged on the cooling chamber or provided In the cooling cavity and leading out of the cooling cavity, the side wall of the cooling cavity includes the circumferential surface of the stator, the wires of the stator located on the circumference of the stator are exposed on the circumferential surface, and the structure connected to the heat dissipation structure and The wires are insulated. 2. The heat dissipation structure of the stator of the flywheel energy storage system according to claim 1, wherein the heat transfer device includes a cooling pipe arranged in the cooling cavity and leading out of the cooling cavity, and a flow in the cooling tube coolant A; Or the heat transfer device includes a heat conductor arranged in the cooling cavity and leading out of the cooling cavity. 3. The stator heat dissipation structure of the flywheel energy storage system according to claim 1, wherein the heat transfer device includes a liquid inlet pipe and a liquid outlet pipe connected to the cooling cavity, and the cooling liquid is an insulating cooling liquid. 4. The heat dissipation structure of the stator of the flywheel energy storage system according to claim 3, wherein the cooling cavity is configured as follows: the heat dissipation structure includes a cooling chamber arranged on the inner surface of the flywheel energy storage system housing corresponding to the installation of the stator. An annular boss at a position and spaced from the circumferential top surface of the stator, an annular plate A and an annular plate B corresponding to the annular boss and the stator, and the annular plate A and the annular plate B are correspondingly sealed and connected to the The annular boss and the two side surfaces of the stator form a cooling cavity, and the annular boss is insulated from the stator. 5. The stator heat dissipation structure of the flywheel energy storage system according to claim 4, wherein the liquid inlet pipe and the liquid outlet pipe are arranged on the side wall of the flywheel energy storage system housing corresponding to the annular boss. The position or via the ring plate of the associated stator leads from the upper and lower end shields of the system housing. 6. A flywheel energy storage system, comprising an annular flat stator, a disc-shaped rotor and a casing, the stator is connected inside the casing, the side surface of the rotor is adjacent to the side surface of the stator, and the rotor rotates Supported on the housing, it is characterized in that it includes a stator heat dissipation structure, and the stator heat dissipation structure includes an annular flat stator, a cooling cavity, a cooling liquid located in the cooling cavity, and a heat transfer device, and the heat transfer device is arranged on the The cooling cavity is provided on or in the cooling cavity and leads out of the cooling cavity, the side wall of the cooling cavity includes the circumferential surface of the stator, the wires of the stator located on the circumference of the stator are exposed on the circumferential surface, and the The structure connected to the heat dissipation structure is insulated from the wires, the stator is connected to the casing through the cooling chamber component, and the stator is insulated from the casing. 7. The flywheel energy storage system according to claim 6, wherein the heat transfer device comprises a cooling pipe arranged in the cooling chamber and leading out of the cooling chamber, and a flowing cooling liquid located in the cooling pipe; Or the heat transfer device includes a heat conductor arranged in the cooling cavity and leading out of the cooling cavity. 8. The flywheel energy storage system according to claim 6, wherein the heat transfer device comprises a liquid inlet pipe and a liquid outlet pipe connected to the cooling cavity, and the cooling liquid is insulating cooling liquid. 9. The flywheel energy storage system according to claim 8, characterized in that, the cooling cavity is configured as follows: the heat dissipation structure includes a motor that is arranged on the inner surface of the housing corresponding to the installation position of the stator and is connected to the stator. An annular boss at intervals on the top surface of the circumference, an annular plate A and an annular plate B corresponding to the annular boss and the stator, and the annular plate A and the annular plate B are correspondingly sealed and connected between the annular boss and the stator The two side surfaces of the ring form a cooling cavity, and the annular boss is insulated from the stator. 10. The flywheel energy storage system according to claim 9, characterized in that, the liquid inlet pipe and the liquid outlet pipe are arranged on the side wall of the housing corresponding to the position of the annular boss or pass through the ring of the associated stator. The board is led out from the upper and lower end covers of the system housing.

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