Flywheel energy storage battery heat dissipation system

Abstract

The utility model relates to a heat dissipation system for a flywheel energy storage battery. The heat dissipation system comprises a mounting shell, a motor, a flywheel and a first heat dissipation assembly, the motor is provided with a rotor which extends to the lower portion of the installation shell, and the flywheel is installed on the peripheral side of the rotor. The first heat dissipation assembly comprises an oil supply circulating cooling assembly, an oil shell and a driving piece, the oil shell is located below the flywheel and installed at the bottom of the installation shell, and the lower end of the rotor downwards penetrates through the upper side wall of the oil shell and is located in the oil shell; a first cooling hole is formed in the center axis of the lower end face of the rotor, the driving part comprises a plurality of spiral fan blades, the spiral fan blades are arranged on the inner side wall of an orifice of the first cooling hole, a plurality of second cooling holes are formed in the rotor, the upper ends of the first cooling hole and the second cooling holes are communicated, and a lower end outlet of the first cooling hole is communicated with an inner cavity of the oil shell. According to the cooling system, the rotating force of the rotor serves as driving force capable of driving the cooling oil in the oil shell to automatically exchange heat with the rotor for cooling, additional electric driving parts are not needed, electric energy is saved, and the temperature of the motor is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flywheel energy storage and heat dissipation, in particular to a flywheel energy storage battery heat dissipation system. Background Art

[0002] Due to the frequent and numerous AGC frequency modulation instructions of the power grid, the flywheel energy storage motor is constantly charged and discharged for a long time, and the operating frequency of the high-speed motor is much higher than that of the traditional motor, which leads to the increase of the motor temperature. With the continuous development of power electronics technology and control systems, AC motors are increasingly widely driven by inverters.

[0003] Since the motor rotor is placed in the stator, its heat can only be dissipated through the stator. The heat dissipation conditions are limited and the heat effect is not ideal. The gradual accumulation of losses may cause a large temperature rise of the rotor. In order to reduce the heat generated by the friction between the flywheel rotor and the air during operation, the flywheel energy storage system performs vacuum treatment on the gap between the flywheel rotor and the outer casing. Since the flywheel rotor of the flywheel energy storage battery is coaxial with the motor rotor, the heat in the motor rotor cannot be conducted to the stator in a vacuum environment. In addition, since the motor rotor and the magnetic levitation system of the high-power magnetic levitation flywheel energy storage battery are made of magnetic steel materials, the Curie temperature of the magnetic steel material is relatively low. High temperature may cause the permanent magnet to lose magnetism or even irreversible demagnetization. The demagnetization of the permanent magnet will cause the flywheel motor to reduce its working efficiency during operation, and the flywheel rotor to become unstable during operation. In severe cases, it may cause the flywheel to overspeed and explode, causing equipment damage or even endangering life safety. Utility Model Content

[0004] The utility model provides a flywheel energy storage battery heat dissipation system, which uses the rotational force of the rotor as the driving force that can drive the cooling oil in the oil shell to automatically exchange heat with the rotor for cooling, does not require additional electric drive parts, saves electric energy, reduces the motor temperature, ensures the working safety of the flywheel energy storage system and prolongs its service life.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A flywheel energy storage battery heat dissipation system comprises a mounting shell, a motor, a flywheel and a first heat dissipation component;

[0007] The motor is arranged above the flywheel, the motor has a rotor, the rotor extends to the lower part of the mounting shell, and the flywheel is mounted on the outer peripheral side of the rotor;

[0008] The first heat dissipation component includes an oil supply circulation cooling component, an oil shell and a driving member, the oil supply circulation cooling component is located outside the mounting shell, the oil shell is located below the flywheel and mounted on the bottom of the mounting shell, the lower end of the rotor passes downward through the upper side wall of the oil shell and is located below the liquid level of the cooling oil contained in the oil shell, and the rotor can rotate relative to the oil shell; a first cooling hole is opened at the central axis of the lower end surface of the rotor, the driving member includes a plurality of spiral blades, the plurality of spiral blades are arranged on the inner side wall of the first cooling hole, a plurality of second cooling holes are opened in the rotor, the plurality of second cooling holes are arranged around the first cooling hole, the first cooling hole is connected to the upper end of the second cooling hole, and the lower end outlet of the first cooling hole is connected to the inner cavity of the oil shell;

[0009] The oil inlet and the oil outlet of the oil supply circulation cooling assembly are communicated with the inner cavity of the oil shell.

[0010] Preferably, a partition is horizontally arranged in the inner cavity of the oil casing, and the partition divides the inner cavity of the oil casing into an oil supply cavity and an oil return cavity, and the oil return cavity is located above the oil supply cavity;

[0011] The lower end of the rotor is located in the oil supply cavity, and the lower end outlet of the second cooling hole is located on the side wall of the rotor and communicates with the oil return cavity;

[0012] The oil inlet of the oil supply circulation cooling component is connected to the oil return chamber, and the oil outlet of the oil supply circulation cooling component is communicated with the oil supply chamber.

[0013] Preferably, a first heat insulation layer is provided on the upper surface of the partition.

[0014] Preferably, a first liquid level sensor and a second liquid level sensor are respectively provided in the oil supply chamber and the oil return chamber, and the first liquid level sensor, the second liquid level sensor and the oil supply circulation cooling assembly are connected to an external controller.

[0015] Preferably, the oil supply circulation cooling assembly includes an oil tank and a first radiator, an oil return pipe is connected between the oil inlet of the oil tank and the oil return chamber, the oil outlet of the oil tank is connected to the oil inlet of the first radiator, an oil supply pipe is connected between the oil outlet of the first radiator and the oil supply chamber, an oil return pump is provided on the oil return pipe, and an oil supply pump is provided on the oil supply pipe.

[0016] Preferably, the outer side wall of the oil casing is provided with a second heat insulation layer.

[0017] Preferably, the second cooling hole is a serpentine hole.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. By setting an oil shell at the bottom of the flywheel housing as a storage point for cooling oil, and using spiral fan blades as driving parts, as long as the rotor rotates, the cooling oil can be driven to circulate in the oil circuit to automatically cool the rotor. No additional oil pump is required as a driving part, which saves electricity to a certain extent and can reduce the temperature of the motor, ensuring the working safety of the flywheel energy storage system and extending its service life.

[0020] 2. By arranging the oil supply circulation cooling assembly, the oil supply pipeline, the oil return pipeline, the oil supply pump and the oil return pump, the oil after the heat exchange in the oil shell can be automatically cooled and supplied, which is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall system of the embodiment of the utility model;

[0023] Figure 2 A cross-sectional view of a rotor in an embodiment of the present utility model;

[0024] Figure 3 This is a bottom view of the rotor of an embodiment of the present utility model.

[0025] Description of reference numerals:

[0026] 1. Mounting shell; 101. Motor shell; 102. Flywheel shell; 2. Motor; 3. Rotor; 31. First cooling hole; 32. Second cooling hole; 4. Flywheel; 5. Oil shell; 51. Partition; 52. Oil supply chamber; 53. Oil return chamber; 6. Driving member; 61. Spiral fan blade; 7. Oil supply circulation cooling assembly; 71. Oil tank; 72. Radiator; 8. Oil supply pipeline; 9. Oil return pipeline; 10. Oil supply pump; 11. Oil return pump; 12. First liquid level sensor; 13. Second liquid level sensor; 14. First thermal insulation layer; 15. Second thermal insulation layer. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1-3As shown, the embodiment of the utility model provides a flywheel energy storage battery heat dissipation system, which specifically includes a mounting shell 1, a motor 2, a flywheel 4 and a first heat dissipation component; wherein the mounting shell 1 includes a motor shell 101 and a flywheel shell 102, the motor 2 is mounted in the motor shell 101, the flywheel 4 is mounted in the flywheel shell 102, the motor shell 101 is mounted above the flywheel shell 102, the lower end of the rotor 3 of the motor 2 enters downward into the flywheel shell 102, the flywheel 4 is mounted on the rotor 3, and rotates with the rotor 3, and in order to ensure the stable rotation of the rotor 3, magnetic bearings (not shown in the figure) are also provided on the upper and lower sides of the flywheel 4, which are mounted on the rotor 3; specifically, for dissipating heat to the rotor 3 The first heat dissipation component includes an oil shell 5 and a driving member 6. The oil shell 5 is located below the flywheel 4 and is installed at the bottom of the flywheel housing 102. The lower end of the rotor 3 passes downward through the upper side wall of the oil shell 5 and is located below the liquid level of the cooling oil contained in the oil shell 5, and the rotor 3 can rotate relative to the oil shell 5. Specifically, a bearing is provided at the upper end of the oil shell 5, and the rotor 3 passes through the bearing at the upper end of the oil shell 5 to enter the inner cavity of the oil shell 5, thereby realizing the installation of the lower part of the rotor 3; further, a first cooling hole 31 is opened at the central axis of the lower end face of the rotor 3, and the driving member 6 includes a plurality of spiral blades 61, and the plurality of spiral blades 61 are installed on the inner side wall of the opening of the first cooling hole 31, and the spiral blades 61 can rotate with the rotor 3. The oil in the oil shell 5 is supplied to the first cooling hole 31. Correspondingly, a plurality of second cooling holes 32 are opened in the rotor 3. The plurality of second cooling holes 32 are arranged around the first cooling hole 31. The upper ends of the first cooling hole 31 and the second cooling hole 32 are connected, so that the first cooling hole 31 and the second cooling hole 32 form an oil path. The lower end outlet of the first cooling hole 31 is connected to the inner cavity of the oil shell 5. The oil driven by the spiral blades 61 flows in the oil path formed by the connection between the first cooling hole 31 and the second cooling hole 32 in the rotor 3, thereby taking away the heat of the rotor 3 itself and playing a role in heat dissipation. Finally, the oil that absorbs the heat returns to the oil shell 5. Because the rotor 3 is in continuous rotation, the plurality of spiral blades 61 The driving member 6 formed by the rotary blades 61 will continuously drive the cooling oil to enter from the opening of the first cooling hole 31, and then return to the oil shell 5 again through the first cooling hole 31 and the second cooling hole 32, and circulate back and forth continuously, finally achieving the heat dissipation on the rotor 3, reducing the temperature of the motor 2, ensuring the working safety of the flywheel 4 energy storage system and extending its service life; and by setting the oil shell 5 as a storage point for the cooling oil at the bottom of the flywheel shell 102, and using the spiral blades 61 as the driving member 6, as long as the rotor 3 rotates, the cooling oil in the oil shell 5 can be driven to circulate in the oil circuit, and the rotor 3 is automatically cooled, and no additional oil pump is required as the driving member 6, which saves electricity to a certain extent. In another embodiment, the second cooling pipe can be a serpentine hole, so that the heat exchange of the oil circuit can be normal, and sufficient heat exchange with the rotor 3 can be carried out, so that the rotor 3 can be fully cooled.

[0031] Specifically, a partition plate 51 is horizontally arranged in the inner cavity of the oil shell 5, and the partition plate 51 divides the oil cavity into an oil supply cavity 52 and an oil return cavity 53. The oil return cavity 53 is located above the oil supply cavity 52, and the lower end of the rotor 3 passes through the oil return cavity 53 and is located in the oil supply cavity 52. ​​Correspondingly, the outlet of the lower end of the second cooling hole 32 is located on the side wall of the rotor 3 in the oil return cavity 53, so that the outlet of the second cooling hole 32 is connected with the oil return cavity 53, so that the plurality of spiral blades 61 form a driving member 6 to pump oil from the oil supply cavity 52 into the first cooling hole 32. The cooling oil that absorbs heat from the rotor 3 enters the oil return chamber 53 after passing through the first cooling hole 31 and the second cooling hole 32. Therefore, the oil temperature in the oil return chamber 53 is higher than that in the oil supply chamber 52. The partition 51 is set to separate the two so that the starting temperature of the oil supply chamber 52 will not be affected. After the cooling oil in the oil supply chamber 52 enters the oil path formed by the first cooling hole 31 and the second cooling hole 32, the heat exchange with the rotor 3 is more complete, and the heat dissipation efficiency will be higher. Because the lower end of the rotor 3 is located in the oil supply chamber 52, a small amount of heat exchange will also occur, so the temperature of the oil supply chamber 52 will slowly rise. A first heat insulation layer 14 is set on the upper end surface of the partition 51. The first heat insulation layer 14 is made of existing heat insulation materials, so as to avoid heat exchange between the oil in the oil return chamber 53 and the oil supply chamber 52, ensure that the temperature of the oil in the oil supply chamber 52 will not rise significantly, and ensure that the oil in the oil supply chamber 52 and the rotor 3 in the oil path are heat exchanged. Preferably, a second heat insulating layer 15 is also provided on the outer wall of the oil shell 5 , thereby avoiding heat exchange between the oil in the oil shell 5 and the heat in the inner cavity of the flywheel housing 102 to a certain extent, thereby ensuring the temperature of the cooling oil in the oil shell 5 .

[0032] Specifically, the first heat dissipation component also includes an oil supply circulation cooling component 7, which is located outside the mounting shell 1. The oil supply circulation cooling component 7 includes an oil tank 71 and a first radiator 72. The oil inlet of the oil tank 71 is connected to an oil return pipe 9. The other end of the oil return pipe 9 passes through the upper end surface of the flywheel housing 102 to enter the flywheel housing 102, and then passes through the upper end surface of the oil shell 5 to enter the oil return cavity 53 and is located at the bottom of the oil return cavity 53. The oil outlet of the oil tank 71 is connected to the oil inlet of the first radiator 72. The first radiator 7 The oil outlet of the flywheel housing 2 is connected to an oil supply pipe 8, the other end of the oil pipe passes through the upper end surface of the flywheel housing 102 to enter the flywheel housing 102, and then passes through the upper end surface of the oil housing 5 and the partition 51 to enter the oil supply chamber 52, and the oil supply pipe 8 is provided with an oil supply pump 10, and the oil return pipe 9 is provided with an oil return pump 11, and the oil chamber and the oil return chamber 53 are respectively provided with a first liquid level sensor 12 and a second liquid level sensor 13, and the first liquid level sensor 12, the second liquid level sensor 13, the oil supply pump 10 and the oil return pump 11 are all connected to the external controller The specific oil supply process is as follows: before the rotor 3 is cooled, the oil supply pump 10 is first started, and the oil in the oil tank 71 is supplied to the return oil pump 11 through the first radiator 72, so that the oil in the oil supply chamber 52 reaches the maximum height preset by the first liquid level sensor 12, and then the oil supply pump 10 is stopped. Then, when the flywheel 4 is storing energy, the rotor 3 will rotate, driving the spiral blades 61 to rotate, thereby driving the cooling oil in the oil supply chamber 52 to enter the oil circuit, and then enter the oil supply chamber 52 after heat exchange with the rotor 3, until When the oil in the return oil chamber 53 reaches the maximum height preset by the second liquid level sensor 13, the external controller will control the return oil pump 11 to start. At this time, the oil supply pump 10 will also start accordingly. The oil supply pump 10 will supply the oil cooled by the first radiator 72 to the oil supply chamber 52 until the oil in the return oil chamber 53 reaches the minimum height preset by the second liquid level sensor 13. The return oil pump 11 stops, and the oil in the oil supply chamber 52 reaches the maximum height preset by the first liquid level sensor 12. The oil supply pump 10 stops and works in a reciprocating cycle.

[0033] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A flywheel energy storage battery heat dissipation system, characterized in that: It includes a mounting shell, a motor, a flywheel and a first heat dissipation component; The motor is arranged above the flywheel, the motor has a rotor, the rotor extends to the lower part of the mounting shell, and the flywheel is mounted on the outer peripheral side of the rotor; The first heat dissipation component includes an oil supply circulation cooling component, an oil shell and a driving member, the oil supply circulation cooling component is located outside the mounting shell, the oil shell is located below the flywheel and is mounted on the bottom of the mounting shell, the lower end of the rotor passes downward through the upper side wall of the oil shell and is located below the liquid level of the cooling oil contained in the oil shell, and the rotor can rotate relative to the oil shell; a first cooling hole is opened at the central axis of the lower end surface of the rotor, the driving member includes a plurality of spiral blades, and the plurality of spiral blades are arranged on the inner side wall of the first cooling hole opening, a plurality of second cooling holes are opened in the rotor, and the plurality of second cooling holes are arranged around the first cooling hole, the first cooling hole and the upper ends of the second cooling holes are connected, and the lower end outlet of the first cooling hole is connected to the inner cavity of the oil shell; The oil inlet and the oil outlet of the oil supply circulation cooling component are communicated with the inner cavity of the oil casing.

2. The flywheel energy storage battery heat dissipation system according to claim 1, characterized in that: A partition is horizontally arranged in the inner cavity of the oil casing, and the partition divides the inner cavity of the oil casing into an oil supply cavity and an oil return cavity, and the oil return cavity is located above the oil supply cavity; The lower end of the rotor is located in the oil supply cavity, and the lower end outlet of the second cooling hole is located on the side wall of the rotor and communicates with the oil return cavity; The oil inlet of the oil supply circulation cooling component is connected to the oil return chamber, and the oil outlet of the oil supply circulation cooling component is communicated with the oil supply chamber.

3. The flywheel energy storage battery heat dissipation system according to claim 2, characterized in that: The upper surface of the partition is provided with a first heat insulation layer.

4. The flywheel energy storage battery heat dissipation system according to claim 2, characterized in that: A first liquid level sensor and a second liquid level sensor are respectively arranged in the oil supply chamber and the oil return chamber. The first liquid level sensor, the second liquid level sensor and the oil supply circulation cooling assembly are connected to an external controller.

5. The flywheel energy storage battery heat dissipation system according to claim 2, characterized in that: The oil supply circulation cooling component includes an oil tank and a first radiator, an oil return pipe is connected between the oil inlet of the oil tank and the oil return chamber, the oil outlet of the oil tank is connected to the oil inlet of the first radiator, an oil supply pipe is connected between the oil outlet of the first radiator and the oil supply chamber, an oil return pump is provided on the oil return pipe, and an oil supply pump is provided on the oil supply pipe.

6. The flywheel energy storage battery heat dissipation system according to claim 1, characterized in that: The outer side wall of the oil casing is provided with a second heat insulation layer.

7. The flywheel energy storage battery heat dissipation system according to claim 1, characterized in that: The second cooling hole is a serpentine hole.

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