Vacuum device system suitable for high-speed flywheel energy storage

Abstract

The invention relates to the field of high-speed flywheel energy storage equipment, and discloses a vacuum device system suitable for high-speed flywheel energy storage. Comprising a flywheel stator, a flywheel rotor coaxially mounted with the flywheel stator, a bearing for supporting the flywheel rotor, a combined sealing structure for preventing gas from entering the flywheel stator, and a vacuumizing device communicated with the inside of the flywheel stator, the vacuumizing device pumps away the atmosphere of the flywheel stator, and a high-vacuum environment in the flywheel stator is maintained. The air leakage of external atmosphere entering the flywheel system can be greatly reduced, the vacuum operation environment in the flywheel stator is ensured, the flywheel operation efficiency is greatly improved, and the rotational inertia of the system is improved.

Description

Technical Field

[0001] This invention patent belongs to the field of high-speed flywheel energy storage equipment, and relates to a vacuum device system suitable for high-speed flywheel energy storage. Background Technology

[0002] Flywheel energy storage is being used more and more widely in various industries. For flywheel energy storage systems, higher rotor speed means higher response speed and electrical efficiency, but the friction between the high-speed rotating flywheel rotor and the air results in high surface temperature of the flywheel rotor, low moment of inertia of the flywheel system, and low operating efficiency of the flywheel, which limits the capacity of flywheel energy storage. Summary of the Invention

[0003] The purpose of this invention is to provide a vacuum device system suitable for high-speed flywheel energy storage, which solves the problems of high surface temperature of existing flywheel energy storage rotors and small rotational inertia of flywheel systems, resulting in low flywheel operating efficiency and small flywheel energy storage capacity.

[0004] Compared with the prior art, the present invention provides a vacuum device system suitable for high-speed flywheel energy storage, including a flywheel stator, a flywheel rotor coaxially mounted with the flywheel stator, a bearing for supporting the flywheel rotor, a combined sealing structure to prevent gas from entering the flywheel stator, and a vacuum pumping device communicating with the interior of the flywheel stator; the vacuum pumping device removes the atmosphere from the flywheel stator to maintain a high vacuum environment inside the flywheel stator.

[0005] According to the present invention, the combined sealing structure further includes a labyrinth seal and a contact seal structure composed of a shaft seal and a flywheel rotor, which reduces the entry of external atmosphere into the flywheel stator through the throttling effect of the sealing structure.

[0006] According to the present invention, the vacuum pumping device is further configured to remove the atmosphere from the flywheel stator, so that the inside of the flywheel stator reaches a suitable vacuum level.

[0007] According to the present invention, the vacuum pump configured in the vacuum pumping device has a graded adjustment function to adjust the vacuum level in the flywheel stator to adapt to different working conditions.

[0008] According to the present invention, the vacuum pumping device is further equipped with a backup pump, which is connected in parallel with the vacuum pump.

[0009] According to the present invention, the operating speed of the vacuum device system is applicable to both full speed and half speed.

[0010] According to the present invention, the internal vacuum degree of the flywheel stator is further maintained at 99% or higher.

[0011] According to the present invention, the combined sealing structure is further comprising two sets, which are respectively disposed at both ends of the flywheel rotor.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The vacuum device system of this invention is characterized by the fact that, under the combined action of the shaft seal and the vacuum pumping device, the shaft seal structure can effectively prevent the outside atmosphere from entering the flywheel stator, while the vacuum pumping device removes the atmosphere inside the flywheel stator, and finally the vacuum degree inside the flywheel stator of the vacuum device system is maintained at more than 99%.

[0013] 2. The vacuum device system of this invention is equipped with a vacuum pump with graded adjustment function and a backup vacuum pump, which increases the system design margin, improves system reliability, and can maintain an extremely high vacuum environment inside the flywheel stator. Attached Figure Description

[0014] Figure 1 This is an overall schematic diagram of a vacuum device system suitable for flywheel energy storage according to an embodiment of the present invention. Figure 2a This is a schematic diagram of the shaft seal according to an embodiment of the present invention. Figure 2b This is a schematic diagram of the labyrinth seal according to an embodiment of the present invention. Figure 3 This is a schematic diagram of a vacuum pumping device according to an embodiment of the present invention. Figure 4 This is a flywheel stator diagram according to an embodiment of the present invention. Figure 5 This is a flywheel rotor diagram of an embodiment of the present invention.

[0015] Among them, 1. Flywheel stator; 2. Flywheel rotor; 3. Bearing; 4. Shaft seal; 5. Vacuum pumping device. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1 to 5 This invention patent discloses a vacuum device system suitable for high-speed flywheel energy storage, comprising: a flywheel stator 1, a flywheel rotor 2 coaxially mounted with the flywheel stator 1, a bearing 3 for supporting the flywheel rotor 2, a shaft seal 4 disposed between the flywheel stator 1 and the flywheel rotor 2, and a vacuum pumping device 5 communicating with the interior of the flywheel stator 1; the vacuum pumping device 5 removes the atmosphere from the flywheel stator 1 to maintain a high vacuum environment inside the flywheel stator 1.

[0018] Please see Figure 2a and 2b The shaft seal 4 is a hollow structure. It is fitted around the outer periphery of the flywheel rotor 2 and fixedly installed on the outer end face of the flywheel stator 1, forming a combined sealing structure of labyrinth seal and contact seal. The labyrinth seal includes fixed protrusions 41 that are evenly arranged along the outer periphery of the shaft seal 4 and fixed to the end face of the flywheel stator 1, and a rotating connecting ring 42 formed by the inner wall of the hollow structure of the shaft seal 4 and cooperating with the flywheel rotor 2. The rotating connecting ring 42 has multiple grooves arranged axially, and the spacing between the grooves is not equal, forming a multi-level seal to prevent external air from entering the interior of the flywheel stator 1.

[0019] In this embodiment of the invention, the vacuum pumping device 5 is equipped with a vacuum pump with at least two levels of adjustable speed, adapting to both full-speed and half-speed operating conditions. The power of the vacuum pump is adjusted according to the operating condition to extract atmospheric air from the flywheel stator 1, ensuring a high vacuum level inside the flywheel stator 1. Specifically, the full-speed operating speeds are 3000 r·min⁻¹ and 3600 r·min⁻¹, and the half-speed operating speeds are 1500 r·min⁻¹ and 1800 r·min⁻¹. Specifically, when the flywheel operates at 3000 r·min⁻¹ or 3600 r·min⁻¹, the vacuum pump operates at maximum power, rapidly removing gas from the flywheel stator 1 to maintain a high vacuum environment; when the flywheel operates at half speed (1500 r·min⁻¹ or 1800 r·min⁻¹), the vacuum pump switches to low-power operation, reducing energy consumption while ensuring efficient vacuum extraction.

[0020] In this embodiment of the invention, the vacuum pumping device 5 is also equipped with a backup pump. The vacuum pump and the backup pump are connected in parallel. When the vacuum pump fails, the backup pump is activated to ensure a high vacuum level. During operation, the vacuum pump of the vacuum pumping device 5 is activated first to evacuate the inside of the flywheel stator 1. After the vacuum level reaches 99% or higher, the flywheel rotor 2 rotates under the support of the bearing 3. At the same time, the shaft seal 4 blocks the entry of outside air in real time. The vacuum pumping device 5 adjusts the power of the vacuum pump in real time according to the rotational speed of the flywheel stator 1 to continuously maintain the high vacuum level inside the flywheel stator 1. If the vacuum pump fails, the backup pump takes over the operation to prevent the vacuum environment of the flywheel stator 1 from failing.

[0021] In summary, this invention provides a vacuum device system suitable for high-speed flywheel energy storage. The vacuum pumping device 5 is combined with the shaft seal 4 to improve the sealing effect between the flywheel stator 1 and the flywheel rotor 2. At the same time, the staged vacuum pumping device 5 extracts the atmosphere inside the flywheel stator 1, which can significantly reduce the amount of air leakage from the outside atmosphere into the flywheel system, ensure the vacuum operating environment inside the flywheel stator, greatly improve the flywheel operating efficiency, and increase the system's rotational inertia.

[0022] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A vacuum device system suitable for high-speed flywheel energy storage, characterized in that, It includes a flywheel stator (1), a flywheel rotor (2) coaxially mounted with the flywheel stator (1), a bearing (3) for supporting the flywheel rotor (2), a combined sealing structure to prevent gas from entering the flywheel stator (1), and a vacuum pumping device (5) communicating with the inside of the flywheel stator (1); the vacuum pumping device (5) removes the atmosphere from the flywheel stator (1) and maintains a high vacuum environment inside the flywheel stator (1).

2. The vacuum device system for high-speed flywheel energy storage according to claim 1, characterized in that, The combined sealing structure includes a labyrinth seal and a contact seal structure composed of a shaft seal (4) and a flywheel rotor (2). Through the throttling effect of the sealing structure, the amount of external air entering the flywheel stator (1) is reduced.

3. A vacuum device system suitable for high-speed flywheel energy storage according to claim 1, characterized in that, The vacuum device (5) is equipped with a vacuum pump to remove the atmosphere from the flywheel stator (1) so that the inside of the flywheel stator (1) reaches a suitable vacuum level.

4. A vacuum device system suitable for high-speed flywheel energy storage according to claim 3, characterized in that, The vacuum pump configured in the vacuum device (5) has a graded adjustment function, which adjusts the vacuum level in the flywheel stator (1) to adapt to different working conditions.

5. A vacuum device system suitable for high-speed flywheel energy storage according to claim 3, characterized in that, The vacuum pumping device (5) is also equipped with a backup pump, which is set up in parallel with the vacuum pump.

6. A vacuum device system suitable for high-speed flywheel energy storage according to claim 1, characterized in that, The operating speed of the vacuum device system is suitable for both full speed and half speed.

7. A vacuum device system suitable for high-speed flywheel energy storage according to claim 1, characterized in that, The internal vacuum of the flywheel stator (1) is maintained at over 99%.

8. A vacuum device system suitable for high-speed flywheel energy storage according to claim 2, characterized in that, The combined sealing structure consists of two sets, which are respectively installed at both ends of the flywheel rotor.

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