Flywheel energy storage device and flywheel energy storage system

Abstract

The utility model relates to the technical field of flywheel energy storage, and discloses a flywheel energy storage device and a flywheel energy storage system.The flywheel energy storage device comprises a rotor shell, a flywheel rotor and a cold air pipe, and the rotor shell is provided with a first cavity, a mounting hole and an exhaust hole, a rotating shaft of the flywheel rotor is arranged in the first cavity and provided with a blind hole formed in the axial direction of the rotating shaft. Air inlet ends of the cold air pipes extend out of the mounting holes, and air outlet ends of the cold air pipes extend into the blind holes; wherein an airflow channel is formed between the cold air pipe and the inner wall of the blind hole, the airflow channel is communicated with the air outlet end of the cold air pipe and the first cavity, and cooling air introduced from the air inlet end of the cold air pipe sequentially flows through the cold air pipe, the airflow channel and the first cavity and flows out from the exhaust hole so as to cool the flywheel rotor. The flywheel energy storage device aims at solving the technical problems that the heat dissipation effect of a flywheel rotor is poor, and the structural stability and reliability of the flywheel energy storage device are affected.

Description

Technical Field

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

[0002] The flywheel energy storage device includes a flywheel rotor and a flywheel energy storage motor. The flywheel rotor is the core component of the flywheel energy storage device. The flywheel rotor operates in a vacuum environment because the flywheel rotor will not be affected by air resistance in a vacuum environment. The vacuum environment can improve the accuracy and stability of the flywheel rotor operation, allowing the flywheel energy storage device to accurately control the storage and release of energy.

[0003] In the related art, the heat dissipation effect of the flywheel rotor in a vacuum environment is poor, which causes the temperature of the flywheel rotor to rise during operation, affecting the structural stability and reliability of the flywheel energy storage device. Utility Model Content

[0004] The utility model aims to provide a flywheel energy storage device and a flywheel energy storage system to solve the technical problem that the heat dissipation effect of the flywheel rotor is poor, which affects the structural stability and reliability of the flywheel energy storage device.

[0005] In a first aspect, the utility model provides a flywheel energy storage device, comprising:

[0006] A rotor housing, wherein the rotor housing is provided with a first cavity and a mounting hole and an exhaust hole communicating with the first cavity;

[0007] A flywheel rotor, wherein the rotating shaft of the flywheel rotor is arranged in the first cavity, and the rotating shaft of the flywheel rotor is provided with a blind hole arranged along its axial direction;

[0008] A cold air pipe, wherein the air inlet end of the cold air pipe extends out of the mounting hole, and the air outlet end of the cold air pipe extends into the blind hole;

[0009] An air flow channel is formed between the cold air pipe and the inner wall of the blind hole, and the air flow channel connects the air outlet end of the cold air pipe and the first cavity. The cooling gas introduced into the air inlet end of the cold air pipe flows through the cold air pipe, the air flow channel and the first cavity in sequence and flows out from the exhaust hole to cool the flywheel rotor.

[0010] In a second aspect, the utility model provides a flywheel energy storage system, comprising a control unit and the flywheel energy storage device, wherein the flywheel energy storage device comprises a flywheel energy storage motor, and the control unit charges and discharges the flywheel energy storage device by controlling the flywheel energy storage motor.

[0011] The utility model provides a flywheel energy storage device, which has the following beneficial effects:

[0012] The flywheel energy storage device of the utility model includes a rotor housing, a flywheel rotor and a cold air pipe, the air inlet end of the cold air pipe extends upward from the mounting hole at the top of the rotor housing, the air outlet end of the cold air pipe extends downward into the blind hole on the rotating shaft of the flywheel rotor, cooling gas is introduced from the air inlet end of the cold air pipe, the cooling gas enters the cold air pipe and the air flow channel formed between the cold air pipe and the blind hole, the inner wall of the blind hole is subjected to impact cooling and convection cooling in the air flow channel, and then enters the first cavity with a larger space after cooling and flows out from the exhaust hole on the rotor housing to form a gas flow to cool the flywheel rotor. The utility model prevents the flywheel rotor from overheating or uneven cooling by forming an air flow channel between the cold air pipe and the blind hole, effectively improves the heat dissipation effect of the flywheel rotor, reduces the heat generated by friction of the flywheel rotor during high-speed rotation, prolongs the service life and stability of the flywheel rotor, and ensures that the structural stability of the flywheel energy storage device is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 A schematic diagram of the structure of a flywheel energy storage device provided in an embodiment of the utility model;

[0015] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0016] Figure 3 for Figure 2 A partial enlarged view of point B in the middle;

[0017] Figure 4 for Figure 3 Another modified embodiment of the first protrusion and the second protrusion;

[0018] Figure 5 for Figure 3 Another modified embodiment of the first protrusion and the second protrusion;

[0019] Figure 6 for Figure 1 A partial enlarged view of point C in the middle.

[0020] The following are marked in the figure:

[0021] 10. Rotor housing; 11. First cavity; 12. Mounting hole; 13. Exhaust hole; 14. Second cavity; 101. First shell; 102. Second shell; 103. End cover; 20. Flywheel rotor; 21. Blind hole; 22. Second protrusion; 30. Cold air pipe; 31. First protrusion; 40. Air flow channel; 50. First exhaust device; 60. Rotor bearing; 70. Sealing structure; 80. Dynamic seal; 90. Flow control valve. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "inside", "outside", etc. used in the present invention to indicate the orientation or positional relationship are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices and elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0025] like Figure 1 As shown, an embodiment of the utility model provides a flywheel energy storage device 100, including a rotor housing 10, a flywheel rotor 20 and a cooling pipe 30, wherein the rotor housing 10 is provided with a first cavity 11 and a mounting hole 12 and an exhaust hole 13 connected to the first cavity 11; the rotating shaft of the flywheel rotor 20 is arranged in the first cavity 11, and the rotating shaft of the flywheel rotor 20 is provided with a blind hole 21 arranged along its axial direction; the air inlet end of the cooling pipe 30 extends out of the mounting hole 12, and the air outlet end of the cooling pipe 30 extends into the blind hole 21; wherein, an air flow channel 40 is formed between the cooling pipe 30 and the inner wall of the blind hole 21, and the air flow channel 40 connects the air outlet end of the cooling pipe 30 and the first cavity 11, and the cooling gas introduced into the air inlet end of the cooling pipe 30 flows through the cooling pipe 30, the air flow channel 40 and the first cavity 11 in sequence and flows out from the exhaust hole 13 to cool the flywheel rotor 20.

[0026] Based on the above technical solution, the air inlet end (upper end) of the cold air pipe 30 extends upward from the mounting hole 12 at the top of the rotor housing 10, and the air outlet end (lower end) of the cold air pipe 30 extends downward into the blind hole 21 on the rotating shaft of the flywheel rotor 20. Cooling gas is introduced from the air inlet end of the cold air pipe 30, and the cooling gas enters the cold air pipe 30 and the air flow channel 40 formed between the cold air pipe 30 and the blind hole 21. The inner wall of the blind hole 21 (i.e., the body of the flywheel rotor 20) is impact cooled and convectively cooled in the air flow channel 40. After cooling, the gas enters the first cavity 11 with a larger space and flows out from the exhaust hole 13 on the rotor housing 10, forming a gas flow to cool the flywheel rotor 20. This embodiment reduces the heat generated by friction during high-speed rotation of the flywheel rotor 20 through an effective cooling system, thereby extending the service life and stability of the flywheel rotor 20. The air flow channel 40 formed between the cold air pipe 30 and the blind hole 21 ensures the effective flow of the cooling gas, prevents the flywheel rotor 20 from overheating or uneven cooling, effectively improves the heat dissipation effect of the flywheel rotor 20, and ensures that the structural stability of the flywheel energy storage device 100 is not affected.

[0027] As an implementation method, Figure 1 As shown, the flywheel energy storage device 100 further includes a first air extraction device 50 , which is connected to the exhaust hole 13 and is used to extract the gas in the first cavity 11 .

[0028] Specifically, the flow rate of the cooling gas is increased by the suction effect of the first suction device 50, and the heat generated by the flywheel rotor 20 is more effectively taken away, thereby improving the cooling effect of the flywheel rotor 20 and reducing the temperature of the flywheel rotor 20. In this embodiment, by providing the first suction device 50, the heat in the first cavity 11 can be extracted in time and discharged to the outside, so as to keep the temperature of the flywheel rotor 20 within a controllable range, thereby ensuring the stable operation of the flywheel energy storage device.

[0029] As an implementation method, Figure 2 and Figure 3 As shown, the air outlet end of the cold air pipe 30 has a first preset distance from the bottom of the blind hole 21 , and the outer wall of the cold air pipe 30 has a second preset distance from the inner wall of the blind hole 21 , so that an air flow channel 40 is formed between the cold air pipe 30 and the blind hole 21 .

[0030] Specifically, a first preset distance formed between the air outlet end (lower end) of the cold air pipe 30 and the bottom of the blind hole 21 can be adjusted, and a second preset distance formed between the outer wall of the cold air pipe 30 and the inner wall of the blind hole 21 can also be adjusted. By adjusting the first preset distance and / or the second preset distance, the size of the airflow channel 40 is adjusted, thereby adjusting the flow rate of the cooling gas and thereby adjusting the cooling effect of the flywheel rotor 20.

[0031] As an implementation method, Figure 3As shown, the outer wall of the cold air pipe 30 is provided with a plurality of first protrusions 31 arranged at intervals, and the inner wall of the blind hole 21 is provided with a plurality of second protrusions 22 arranged at intervals, and each second protrusion 22 is staggered with each first protrusion 31 .

[0032] Specifically, the outer wall of the cold air pipe 30 is provided with a first protrusion 31, which protrudes toward the inner wall of the blind hole 21, and the inner wall of the blind hole 21 is provided with a second protrusion 22, which protrudes toward the outer wall of the cold air pipe 30, and the first protrusion 31 and the second protrusion 22 are staggered with each other, that is, the first protrusion 31 is oriented toward the middle position of two adjacent second protrusions 22, and the second protrusion 22 is oriented toward the middle position of two adjacent first protrusions 31, thereby increasing the stroke of the cooling gas flowing through the airflow channel 40, making the gas flow path more tortuous and longer. Compared with a long straight airflow channel, this embodiment can increase the surface contact time of the cooling gas with the flywheel rotor 20 (or the inner wall of the blind hole 21) by increasing the stroke of the cooling gas flowing, which is conducive to the cooling gas to more fully absorb the heat on the surface of the flywheel rotor 20 and improve the cooling effect.

[0033] As an implementation manner, the first protrusion 31 and the second protrusion 22 are in a square, triangle or arc shape.

[0034] For example, Figure 3 As shown, the first protrusion 31 and the second protrusion 22 are in the shape of a triangle; or Figure 4 As shown, the first protrusion 31 and the second protrusion 22 are in a square shape; or Figure 5 As shown, the first protrusion 31 and the second protrusion 22 are in an arc shape. Of course, the protrusion structure of this embodiment is not limited to the above-mentioned shapes, but can also be other shapes, and different types of shapes can also be combined with each other without specific restrictions, as long as the cooling gas flow path can be increased, it is within the protection scope of this embodiment.

[0035] As an implementation method, Figure 1As shown, the rotor housing 10 is also provided with a second cavity 14, and the first cavity 11 is located above the second cavity 14; the rotor housing 10 includes a first shell 101, a second shell 102 and an end cover 103, the end cover 103 is covered on the second shell 102 to form the second cavity 14, and the first shell 101 is covered on the end cover 103 to form the first cavity 11; the mounting hole 12 is provided in the first shell 101, and the air flow channel 40 is connected to the first cavity 11; the flywheel energy storage device includes a rotor bearing 60 and a sealing structure 70, the rotor bearing 60 is provided at one end of the flywheel rotor 20 close to the first cavity 11 and connected to the end cover 103, and the sealing structure 70 is provided on the circumferential surface of the flywheel rotor 20 close to the end cover 103 to seal the first cavity 11 and the second cavity 14; a dynamic seal 80 is provided at the lower end of the rotor bearing 60, and the dynamic seal 80 is used to slow down the flow of cooling gas from the first cavity 11 to the second cavity 14.

[0036] Specifically, the internal structure of the rotor housing 10 of the present application is divided into a first cavity 11 located at the upper position and a second cavity 14 located at the lower position. The first shell 101 and the end cover 103 form the first cavity 11, and the end cover 103 and the second shell 102 form the second cavity 14. The main structure of the flywheel rotor 20 is located in the second cavity 14. A rotor bearing 60 is provided at the top of the flywheel rotor 20. A sealing structure 70 is provided between the first cavity 11 and the second cavity 14 and connects the first cavity 11 and the second cavity 14. The sealing structure 70 is provided on the top end surface of the flywheel rotor 20, which can ensure that the vacuum degree of the two first cavities 11 and the second cavity 14 is not affected by the external environment. Figure 6 As shown, the dynamic seal 80 at the lower end of the rotor bearing 60 is used to slow down the flow of cooling gas from the first cavity 11 to the second cavity 14, ensuring that the second cavity 14 is in a relatively high vacuum environment.

[0037] Among them, the dynamic seal 80 is a structure for preventing fluid or gas leakage, and is usually used for moving parts in mechanical systems (such as pistons, valve stems or rotating shafts, etc.). The dynamic seal 80 is different from the static seal. The dynamic seal 80 needs to maintain effective sealing performance during the activity or movement. In practical applications, the dynamic seal 80 can be made of soft materials, such as rubber, polyurethane, polytetrafluoroethylene, etc., to adapt to the movement of the moving parts and maintain the sealing effect. The dynamic seal 80 can be designed as a ring or a similar shape, and installed on the sealing contact surface between the moving part and the fixed part to prevent liquid or gas from leaking through these contact surfaces. In this embodiment, the dynamic seal 80 is installed at the lower end of the rotor bearing 60, which can slow down the flow of cooling gas from the first cavity 11 to the second cavity 14.

[0038] As an implementation manner, the flywheel energy storage device 100 includes a second air extraction device (not shown in the drawings), which is connected to the second cavity 14 and is used to extract the gas in the second cavity 14 .

[0039] Specifically, the main structure of the flywheel rotor 20 is located in the second cavity 14, and the vacuum degree requirement is relatively high. By extracting the gas in the second cavity 14 through the second exhaust device, the flywheel rotor 20 can be ensured to operate under a suitable vacuum degree. In this embodiment, by respectively providing an exhaust device in the first cavity 11 and the second cavity 14, different negative pressure environments can be formed to meet the operating requirements of the flywheel rotor 20. Among them, the first exhaust device 50 and the second exhaust device can use vacuum pumps that extract negative pressure.

[0040] As an implementation manner, the sealing structure 70 includes any one of a mechanical seal, a carbon ring seal or a magnetic fluid seal.

[0041] Specifically, a mechanical seal achieves sealing through mechanical contact between two relatively moving parts, and is usually made of hard materials, such as metal or ceramic, and has high wear resistance and corrosion resistance, and can provide good sealing performance to prevent gas leakage; a carbon ring seal is an annular sealing element made of carbon material, and has high wear resistance and high temperature resistance, and is often used for sealing high-speed rotating equipment, such as the flywheel rotor 20 of this embodiment; a magnetic fluid seal uses a magnetic field to control the flow of a fluid, thereby achieving a sealing effect, and is made of a magnetic liquid or a magnetic solid, and also has high sealing performance. In general, whether it is a mechanical seal, a carbon ring seal or a magnetic fluid seal, it can provide good sealing performance, reduce energy loss and friction loss, maintain the stable operation of the flywheel rotor 20, and thus improve the reliability of the flywheel energy storage device 100.

[0042] As an implementation method, Figure 1 As shown, the flywheel energy storage device 100 further includes a flow control valve 90, which is disposed at a position where the air inlet end of the cooling air pipe 30 extends out of the mounting hole 12, and is used to control the flow of the cooling gas.

[0043] Specifically, the flow control valve 90 can adjust the flow of the cooling gas to optimize the cooling effect. When in use, by adjusting the size of the flow control valve 90, the flow of the cooling gas can be adjusted to ensure that sufficient cooling gas flows through the cold air pipe 30 and the air flow channel 40, effectively absorbing heat, and the cooling effect can be adjusted according to actual needs to achieve precise control of the temperature of the flywheel energy storage device 100. Under different working conditions, the flow is adjusted to keep the flywheel rotor 20 running within a safe temperature range to prevent the flywheel rotor 20 from overheating or overcooling, resulting in performance problems or damage.

[0044] As an embodiment, the flywheel energy storage device 100 also includes a gas storage device (not shown in the drawings), the flow control valve 90 is connected to the gas storage device, and the gas storage device is used to introduce cooling gas into the air inlet end of the cold air pipe 30.

[0045] Specifically, the gas storage device is used to store cooling gas and provide cooling gas to the air inlet end of the cold air pipe 30. The flywheel energy storage device 100 has sufficient cooling gas supply to maintain the cooling effect of the flywheel rotor 20. It can be understood that the gas storage device provides a stable cooling gas source, and cooling gas can be obtained from the gas storage device at any time when needed to ensure the stability of the cooling effect. Since the gas storage device is connected to the flow control valve 90, the supply of cooling gas can be quickly adjusted by adjusting the flow control valve 90 to meet the operating requirements of the flywheel rotor 20.

[0046] In the second aspect, an embodiment of the utility model provides a flywheel energy storage system, which includes a control unit and a flywheel energy storage device 100. The flywheel energy storage device 100 includes a flywheel energy storage motor (not shown in the drawings). The control unit charges and discharges the flywheel energy storage device 100 by controlling the flywheel energy storage motor.

[0047] Specifically, the flywheel energy storage device 100 has a flywheel energy storage motor, which converts electrical energy into the rotational kinetic energy of the flywheel rotor 20 to achieve energy storage. When energy needs to be released, the control unit controls the flywheel energy storage motor to convert the rotational kinetic energy into electrical energy for use by an external system or device. In this embodiment, the flywheel energy storage device is charged and discharged by the control unit, so that the flywheel energy storage system has flexibility and rapid response capabilities, and can adjust the energy storage and release speed according to actual needs to meet the energy needs under different working conditions and achieve real-time response to the power system.

[0048] It should be understood that the flywheel energy storage device 100, as a power-type energy storage device, can be used for short-term support of power. When electricity consumption is low, the excess electricity generated is used to drive the flywheel energy storage device 100; when electricity consumption is peak, the flywheel energy storage device 100 drives the generator to operate, and converts mechanical energy into electrical energy that matches the power grid through electrical equipment. In addition to having good power characteristics, fast response speed, long service life, long system maintenance cycle, green and pollution-free, the flywheel energy storage device 100 also has the obvious advantages of fast charging and discharging, continuous charging and discharging, and deep charging and discharging.

[0049] It should be understood that the term "and / or" used in the present utility model specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, including these combinations. It should be noted that, in this article, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "including a..." does not exclude the presence of other identical elements in the process, method, article or system including the element.

[0050] The serial numbers of the embodiments of the utility model are only for description and do not represent the advantages and disadvantages of the embodiments. The above description is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A flywheel energy storage device, characterized in that: include: A rotor housing, wherein the rotor housing is provided with a first cavity and a mounting hole and an exhaust hole communicating with the first cavity; A flywheel rotor, wherein the rotating shaft of the flywheel rotor is arranged in the first cavity, and the rotating shaft of the flywheel rotor is provided with a blind hole arranged along its axial direction; A cold air pipe, wherein the air inlet end of the cold air pipe extends out of the mounting hole, and the air outlet end of the cold air pipe extends into the blind hole; An air flow channel is formed between the cold air pipe and the inner wall of the blind hole, and the air flow channel connects the air outlet end of the cold air pipe and the first cavity. The cooling gas introduced into the air inlet end of the cold air pipe flows through the cold air pipe, the air flow channel and the first cavity in sequence and flows out from the exhaust hole to cool the flywheel rotor.

2. The flywheel energy storage device according to claim 1, characterized in that: The flywheel energy storage device further includes a first air extraction device, which is connected to the exhaust hole and is used to extract the gas in the first cavity.

3. The flywheel energy storage device according to claim 1, characterized in that: The air outlet end of the cold air pipe has a first preset distance from the bottom of the blind hole, and the outer wall of the cold air pipe has a second preset distance from the inner wall of the blind hole, so that the air flow channel is formed between the cold air pipe and the blind hole.

4. The flywheel energy storage device according to claim 1, characterized in that: The outer wall of the cold air pipe is provided with a plurality of first protrusions arranged at intervals, and the inner wall of the blind hole is provided with a plurality of second protrusions arranged at intervals, and each of the second protrusions is staggered with each of the first protrusions.

5. The flywheel energy storage device according to claim 4, characterized in that: The first protrusion and the second protrusion are in a square, triangle or arc shape.

6. The flywheel energy storage device according to claim 2, characterized in that: The rotor housing is further provided with a second cavity, and the first cavity is located above the second cavity; The rotor housing comprises a first shell, a second shell and an end cover, wherein the end cover is covered on the second shell to form the second cavity, and the first shell is covered on the end cover to form the first cavity; the mounting hole is provided on the first shell, and the airflow channel is connected to the first cavity; The flywheel energy storage device comprises a rotor bearing and a sealing structure, wherein the rotor bearing is arranged at one end of the flywheel rotor close to the first cavity and connected to the end cover, and the sealing structure is arranged on the circumferential surface of the flywheel rotor close to the end cover to seal the first cavity and the second cavity; A dynamic seal is provided at the lower end of the rotor bearing, and the dynamic seal is used to slow down the flow of the cooling gas from the first cavity to the second cavity.

7. The flywheel energy storage device according to claim 6, characterized in that: The flywheel energy storage device includes a second air pumping device, which is connected to the second cavity and is used to extract gas from the second cavity.

8. The flywheel energy storage device according to claim 6, characterized in that: The sealing structure includes any one of a mechanical seal, a carbon ring seal or a magnetic fluid seal.

9. The flywheel energy storage device according to claim 1, characterized in that: The flywheel energy storage device also includes a flow control valve, which is arranged at a position where the air inlet end of the cold air pipe extends out of the mounting hole and is used to control the flow of the cooling gas.

10. The flywheel energy storage device according to claim 9, characterized in that: The flywheel energy storage device also includes a gas storage device, the flow control valve is connected to the gas storage device, and the gas storage device is used to introduce the cooling gas into the air inlet end of the cold air pipe.

11. A flywheel energy storage system, characterized in that: It comprises a control unit and a flywheel energy storage device as described in any one of claims 1 to 10, wherein the flywheel energy storage device comprises a flywheel energy storage motor, and the control unit charges and discharges the flywheel energy storage device by controlling the flywheel energy storage motor.

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