CN115360849B

CN115360849B - Flywheel energy storage system

Info

Publication number: CN115360849B
Application number: CN202211294602.3A
Authority: CN
Inventors: 苏森; 王志强; 陈胜林; 韩坤; 卜庆瑞
Original assignee: Huachi Kinetic Energy Beijing Technology Co ltd
Current assignee: Huachi Kinetic Energy Beijing Technology Co ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2023-05-16
Anticipated expiration: 2042-10-21
Also published as: CN115360849A

Abstract

The invention discloses a flywheel energy storage system, which comprises a shell, a flywheel, a sealing assembly, a stator and a rotor, wherein the shell is provided with an inner cavity; the flywheel is rotatably assembled in the inner cavity; the sealing component is arranged between the shell and the flywheel to realize rotary sealing between the shell and the flywheel, the inner cavity is divided into a cooling cavity and a vacuum cavity by the sealing component, and the vacuum cavity is suitable for reducing the rotation resistance of the flywheel; the stator and the rotor are arranged in the cooling cavity, a cooling medium is suitable for being introduced into the cooling cavity to cool the stator and the rotor, the stator is arranged in the shell, and the rotor is arranged in the flywheel and can rotate under the action of the stator. The flywheel energy storage system provided by the embodiment of the invention has the advantage of good heat dissipation effect.

Description

Flywheel energy storage system

Technical Field

The invention relates to the technical field of power storage, in particular to a flywheel energy storage system.

Background

The energy storage flywheel drives the flywheel to rotate at a high speed through the motor, electric energy is temporarily converted into kinetic energy of the flywheel, the electric energy is stored in the form of kinetic energy of the flywheel, and the flywheel is used for driving the generator to generate electricity when needed, so that the heat dissipation effect of the flywheel energy storage system in the related technology is poor, and the failure rate is high.

Disclosure of Invention

The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:

in order to reduce the resistance of the flywheel and air, the flywheel energy storage system in the related art is arranged in a vacuum environment, and the heat dissipation effect of the part of the motor on the flywheel under the vacuum condition is poor, so that faults are easy to cause.

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a flywheel energy storage system, which has the advantage of good heat dissipation effect.

The flywheel energy storage system comprises a shell, wherein the shell is provided with an inner cavity; a flywheel rotatably mounted within the inner cavity; the sealing component is arranged between the shell and the flywheel to realize rotary sealing between the shell and the flywheel, the inner cavity is divided into a cooling cavity and a vacuum cavity by the sealing component, and the vacuum cavity is suitable for reducing the rotation resistance of the flywheel; the stator and the rotor are arranged in the cooling cavity, a cooling medium is suitable for being introduced into the cooling cavity to cool the stator and the rotor, the stator is arranged in the shell, and the rotor is arranged in the flywheel and can rotate under the action of the stator.

The flywheel energy storage system provided by the embodiment of the invention has the advantage of good heat dissipation effect.

In some embodiments, the flywheel includes a wheel shaft portion extending in an axial direction of the housing and a part of the wheel shaft portion being located in the cooling chamber, and a rotor portion provided on an outer peripheral side of the wheel shaft portion to increase rotational inertia of the flywheel, the rotor portion being provided in the vacuum chamber.

In some embodiments, the housing is provided with an inlet aperture in communication with the cooling cavity and an outlet aperture in communication with the cooling cavity adapted to provide air to and from the cooling cavity.

In some embodiments, the inlet holes are located on one side of the stator and the outlet holes are located on the other side of the stator for the cooling medium to flow between the stator and the rotor.

In some embodiments, the air inlet holes are a plurality of, a plurality of the air inlet holes are spaced apart along the circumference of the housing.

In some embodiments, the housing is provided with a cooling passage extending in a circumferential direction of the housing and provided on an outer circumferential side of the stator to be adapted to allow a cooling liquid to flow through the housing.

In some embodiments, the housing is provided with a flow guide groove which is arranged on the outer peripheral side of the housing and extends along the circumferential direction of the housing, and the housing comprises a sealing ring which is covered on the notch of the flow guide groove in a sealing way so as to form the cooling channel.

In some embodiments, a plurality of protruding portions are disposed in the diversion trench, the protruding portions are disposed between the sealing ring and the bottom of the diversion trench, the protruding portions extend along the circumferential direction of the housing, the protruding portions are provided with diversion portions, the diversion portions are suitable for cooling liquid to flow from one side of the protruding portions to the other side of the protruding portions, the protruding portions are disposed at intervals along the axial direction of the housing, the cooling liquid flows from one side of the protruding portions to the other side of the protruding portions to cool the housing, and the diversion portions of two adjacent protruding portions are disposed oppositely.

In some embodiments, the sealing assembly comprises an annular portion and a sealing liquid, the annular portion is arranged in the inner cavity, the outer wall of the annular portion is in sealing connection with the shell, the annular portion is sleeved on the outer peripheral side of the flywheel, and the sealing liquid is filled between the inner wall of the annular portion and the outer peripheral wall of the flywheel so as to be suitable for connecting the annular portion and the sealing assembly in an annular mode.

In some embodiments, the annular portion includes a magnetic ring, the flywheel is rotatably mounted to the magnetic ring with an annular gap therebetween, and the sealing fluid is a magnetic fluid to adapt the sealing fluid to be confined within the annular gap by the magnetic ring.

Drawings

Fig. 1 is a schematic structural diagram of a flywheel energy storage system according to an embodiment of the invention.

Fig. 2 is a partial enlarged view at a in fig. 1.

Fig. 3 is a partial enlarged view at B in fig. 1.

FIG. 4 is a schematic cross-sectional view of a cooling channel of a flywheel energy storage system according to an embodiment of the invention.

Reference numerals:

a housing 1; a first housing 11; a second housing 12; an air outlet hole 121; an air intake hole 122; a cooling passage 123; a flow guide groove 1231; a boss 1232; a seal ring 1233; a flow guide 1234;

a flywheel 2; a wheel shaft portion 21; a rotor section 22;

a sealing assembly 3; an annular portion 31; a magnetic ring 311; an annular flange 3111; a magnetism blocking ring 312;

a rotor 41; a stator 42.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

A flywheel 2 energy storage system according to an embodiment of the present invention is described below with reference to fig. 1, 2 and 3.

The flywheel 2 energy storage system of the embodiment of the invention comprises a shell 1, a flywheel 2, a sealing assembly 3, a stator 42 and a rotor 41.

The housing 1 is provided with an inner cavity. The flywheel 2 is rotatably fitted within the inner cavity.

Specifically, the casing 1 extends along a vertical up-down direction, an inner cavity is arranged in the casing 1, the inner cavity extends along the vertical up-down direction, the inner cavity is a stepped cylindrical hole, the inner cavity and the casing 1 are coaxially arranged, the axis of the flywheel 2 extends along the vertical up-down direction, the flywheel 2 is rotationally assembled in the inner cavity along the axis of the flywheel 2, and the axis of the flywheel 2 coincides with the axis of the casing 1.

The sealing component 3 is arranged between the shell 1 and the flywheel 2 to realize rotary sealing between the shell 1 and the flywheel 2, and the sealing component 3 divides the inner cavity into a cooling cavity and a vacuum cavity, and the vacuum cavity is suitable for reducing the rotation resistance of the flywheel 2.

Specifically, the seal assembly 3 is disposed in the inner cavity, the seal assembly 3 extends along the circumferential direction of the flywheel 2 in a closed manner, the seal assembly 3 is in an annular structure, the inner edge of the seal assembly 3 is connected with the outer circumferential surface of the flywheel 2 in a sealing manner, the outer edge of the seal assembly 3 is connected with the inner wall of the housing 1 in a sealing manner, the inner edge of the seal assembly 3 and the outer edge of the seal assembly 3 are rotatable relatively to allow the flywheel 2 to rotate relative to the housing 1, and the inner edge of the seal assembly and the outer edge of the seal assembly 3 are connected in a sealing manner to seal one side of the seal assembly 3 in the axial direction from the other side of the seal assembly 3 in the axial direction.

The part of the inner cavity, which is positioned at the lower side of the sealing assembly 3, is a vacuum cavity, the part of the inner cavity, which is positioned at the upper side of the sealing assembly 3, is a cooling cavity, the vacuum cavity is in a vacuum environment or is similar to the vacuum environment, and the air density in the vacuum cavity is smaller, so that when the flywheel 2 rotates along the axis of the flywheel, the viscous resistance of the air in the vacuum cavity to the part of the flywheel 2, which is positioned in the vacuum cavity, is reduced.

The stator 42 and the rotor 41 are provided in a cooling chamber, in which a cooling medium is adapted to be introduced for cooling the stator 42 and the rotor 41, the stator 42 is provided in the housing 1, and the rotor 41 is provided in the flywheel 2 and is rotatable under the influence of the stator 42.

Specifically, the rotor 41 is disposed at a portion of the flywheel 2 located in the cooling cavity, the rotor 41 extends along the circumferential direction of the flywheel 2 in a closed manner, the stator 42 is disposed at an outer circumferential side of the rotor 41, the stator 42 extends along the outer circumferential side of the rotor 41 in a closed manner, the stator 42 is in an annular structure, the rotor 41 and the flywheel 2 are in running fit with an inner edge of the stator 42, an outer edge of the stator 42 is fixedly connected with the housing 1, the stator 42 generates a variable magnetic field under the condition of being electrified, and the rotor 41 generates an inductive effect in the magnetic field generated by the stator 42, so that the rotor 41 is driven to rotate relative to the stator 42 together with the flywheel 2.

The cooling chamber has a flowing cooling medium therein, the cooling medium is in contact with the stator 42 and the rotor 41 and flows through gaps of the stator 42 and the rotor 41, when the cooling medium flows through surfaces of the stator 42 and the rotor 41, heat in the stator 42 or the rotor 41 is transferred to the cooling medium through heat exchange, and when the cooling medium flows out of the cooling chamber, the cooling medium carries heat in the stator 42 and the rotor 41 to the outside of the cooling chamber to cool the tripod and the rotor 41.

According to the flywheel 2 energy storage system disclosed by the embodiment of the invention, the inner cavity of the shell 1 is divided into the vacuum cavity and the cooling cavity through the sealing component 3, one part of the flywheel 2 is positioned in the vacuum cavity to reduce the resistance of the part of the flywheel 2 positioned in the vacuum cavity in the rotating process, the other part of the flywheel 2, the stator 42 and the rotor 41 are positioned in the cooling cavity, the stator 42 and the rotor 41 drive the flywheel 2 to rotate relative to the shell 1, so that electric energy is converted into kinetic energy of the flywheel 2, or the kinetic energy of the flywheel 2 is converted into electric energy through the stator 42 and the rotor 41 in the rotating process, one part of energy is lost in the form of the internal energy of the stator 42 or the rotor 41 in the converting process of the electric energy and the kinetic energy, and the cooling medium in the cooling cavity takes away the heat in the stator 42 and the rotor 41 to enable the stator 42 and the rotor 41 to be in the working temperature range, so that the flywheel 2 energy storage system disclosed by the embodiment of the invention has the advantage of good heat dissipation effect.

In some embodiments, the flywheel 2 includes a wheel shaft portion 21 and a rotor portion 22, the wheel shaft portion 21 extending in the axial direction of the housing 1 and a part of the wheel shaft portion 21 being located in the cooling chamber, the rotor portion 22 being provided on the outer peripheral side of the wheel shaft portion 21 to increase the moment of inertia of the flywheel 2, the rotor portion 22 being provided in the vacuum chamber.

Specifically, the wheel shaft portion 21 extends in the vertical up-down direction, the rotor portion 22 has an annular structure, the rotor portion 22 extends along the outer circumference side circumference of the wheel shaft portion 21 in a closed manner, and the upper and lower ends of the wheel shaft portion 21 are respectively provided with axial magnetic bearings to reduce friction with the housing 1 when the wheel shaft portion 21 rotates.

The rotor portion 22 is located at the lower half of the axle portion 21 to have higher stability, the rotor portions 22 are uniformly distributed along the circumferential direction of the axle portion 21, and the outer diameter of the rotor portion 22 is far greater than the maximum diameter of the axle portion 21, and the rotor portion 22 has larger moment of inertia, so as to improve the capacity of the flywheel 2 energy storage system according to the embodiment of the invention.

Thus, the outer diameter of the rotor portion 22 is much larger than the maximum diameter of the wheel shaft portion 21, so that the outer side surface of the rotor portion 22 has a large linear velocity when the flywheel 2 rotates, the air density in the vacuum chamber is low, the viscous resistance is small, and the rotor portion 22 is located in the vacuum chamber to reduce the resistance of the rotor portion 22 when the flywheel 2 rotates.

In some embodiments, the housing 1 is provided with an air inlet hole 122 and an air outlet hole 121, the air inlet hole 122 being in communication with the cooling cavity, the air outlet hole 121 being in communication with the cooling cavity, adapted to allow air to enter and exit the cooling cavity.

Specifically, the air intake holes 122 are through holes penetrating the cooling chamber and the outer surface of the housing 1 in the radial direction of the housing 1, the air outlet holes 121 are through holes penetrating the cooling chamber and the outer surface of the housing 1 in the radial direction of the housing 1, and the cooling medium is air.

Thereby, air enters the cooling cavity from the outside of the housing 1 through the air inlet hole 122, and air flows from the cooling cavity to the outside of the housing 1 through the air outlet hole 121, when the flywheel 2 energy storage system of the embodiment of the present invention is operated, heat generated by the stator 42 and the rotor 41 is exchanged into the air in the cooling cavity through convection heat exchange, and when the air flows from the air outlet hole 121 to the outside of the housing 1, the heat in the air in the cooling cavity is exchanged to the outside of the housing 1 through heat convection, thereby completing heat dissipation to the stator 42 and the rotor 41.

In some embodiments, the inlet holes 122 are located on one side of the stator 42 and the outlet holes 121 are located on the other side of the stator 42 for the cooling medium to flow between the stator 42 and the rotor 41.

Specifically, the air inlet holes 122 are located at the upper side of the stator 42, and the air outlet holes 121 are located at the lower side of the stator 42, and when the cooling medium flows into the cooling chamber from the air inlet holes 122 and flows out of the cooling chamber from the air outlet holes 121, the cooling medium flows in the direction a as shown in fig. 2.

Thereby, as shown in fig. 2, the cooling medium flows through the gap between the stator 42 and the rotor 41, and the cooling medium is sufficiently in contact with the stator 42 and the rotor 41, so that heat is sufficiently exchanged by convection between the stator 42 or the rotor 41 and the cooling medium, and the cooling effect on the stator 42 and the rotor 41 is improved.

In addition, since the density of the cold air is greater than that of the hot air, the cold air can be settled to the lower side of the hot air, and the air inlet 122 is positioned at the lower side of the air outlet, so that the air with lower temperature settled at the lower position outside the shell 1 enters the cooling cavity through the air inlet 122, thereby improving the heat dissipation effect of the flywheel 2 energy storage system in the embodiment of the invention.

In some embodiments, the plurality of air intake holes 122 are provided, and the plurality of air intake holes 122 are arranged at intervals along the circumferential direction of the housing 1.

Specifically, the plurality of air intake holes 122 are arranged at equal intervals in the circumferential direction of the housing 1, and when the cooling medium is air, the plurality of air intake holes 122 can simultaneously supply air outside the housing 1 into the cooling chamber.

Therefore, on one hand, the ventilation quantity of air when the stator 42 and the rotor 41 are cooled by the air is improved, and on the other hand, the plurality of air inlets 122 are arranged at equal intervals along the circumferential direction of the shell 1, so that when the air flows along the gap between the stator 42 and the rotor 41 to generate air flow, the air flow is uniformly distributed along the circumferential direction of the rotor 41, the heat dissipation effect of the air on the stator 42 and the rotor 41 is uniformly distributed, and the heat dissipation effect of the flywheel 2 energy storage system in the embodiment of the invention is improved.

In some embodiments, the casing 1 is provided with cooling passages 123, the cooling passages 123 extending in the circumferential direction of the casing 1 and provided on the outer circumferential side of the stator 42 so as to be adapted to allow cooling liquid to flow through the casing 1.

Specifically, the cooling passage 123 extends between the inner cavity and the outer surface of the casing 1, and the cooling passage 123 extends along the circumferential direction of the casing 1 on the outer circumferential side of the stator 42, and a cooling liquid is provided in the cooling passage 123, flows in the casing 1 along the cooling passage 123, and performs convective heat exchange with the casing 1 to carry heat conducted from the stator 42 to the casing 1 out of the casing 1 to radiate heat from the casing 1.

Therefore, the cooling liquid in the cooling channel 123 radiates heat from the shell 1 at the outer periphery side of the stator 42 in the flowing process, so that the temperature of the shell 1 at the outer periphery side of the stator 42 is reduced, the temperature difference between the stator 42 and the shell 1 is increased, and the heat generated in the stator 42 is conveniently transferred into the shell 1 through heat conduction, so that the heat of the stator 42 is reduced, and the radiating effect of the flywheel 2 energy storage system in the embodiment of the invention is improved.

In some embodiments, there are a plurality of cooling channels 123, the plurality of cooling channels 123 extending along the circumferentially closed circumference of the housing 1. In other embodiments, the cooling channel 123 extends helically along the circumference of the housing 1.

In some embodiments, the housing 1 is provided with a flow guiding groove 1231, the flow guiding groove 1231 is disposed on the outer circumferential side of the housing 1 and extends along the circumferential direction of the housing 1, the housing 1 includes a sealing ring 1233, and the sealing ring 1233 seals the notch covered on the flow guiding groove 1231 to form the cooling passage 123.

Specifically, guiding gutter 1231 locates the periphery side of casing 1 and communicates with the lateral surface of casing 1, and guiding gutter 1231 is located the periphery side of stator 42, and sealing ring 1233 is annular structure, and the notch at guiding gutter 1231 is covered to sealing ring 1233's inner edge, and sealing ring 1233's inner edge and casing 1 sealing connection with the cooling channel 123 of sealing forming guiding gutter 1231, avoid the coolant liquid in the guiding gutter 1231 to spill over.

From this, guiding gutter 1231 locates the periphery side of casing 1 and communicates with the lateral surface of casing 1, and on the one hand is convenient for process out guiding gutter 1231 at the surface of casing 1, on the other hand is convenient for examine and repair guiding gutter 1231 after taking off sealing ring 1233.

In some embodiments, a plurality of protruding portions 1232 are disposed in the flow guiding groove 1231, the protruding portions 1232 are disposed between the sealing ring 1233 and the groove bottom of the flow guiding groove 1231, the protruding portions 1232 extend along the circumferential direction of the housing 1, the protruding portions 1232 are provided with flow guiding portions 1234, the flow guiding portions 1234 are suitable for cooling liquid to flow from one side of the protruding portions 1232 to the other side of the protruding portions 1232, the protruding portions 1232 are arranged at intervals along the axial direction of the housing 1, the cooling liquid flows from one side of the protruding portions 1232 to the other side of the protruding portions 1232 to cool the housing 1, and the flow guiding portions 1234 of two adjacent protruding portions 1232 are arranged oppositely.

Specifically, the protruding portion 1232 is a circular flange, the outer edge of the protruding portion 1232 is provided with a notch to form the guide portion 1234, as shown in fig. 4, when the cooling liquid flows from one side of the protruding portion 1232 to the other side of the protruding portion 1232, the cooling liquid sequentially passes through the protruding portions 1232, when the cooling liquid passes through a certain protruding portion 1232, the cooling liquid flows from one side of the protruding portion 1232 to the other side of the protruding portion 1232 along the guide portion in the protruding portion 1232, and projections of the guide portion 1234 of the protruding portion 1232 in the axial direction of the housing 1 are symmetrically arranged along the radial direction of the housing 1.

Therefore, when the cooling liquid flows in the diversion trench 1231, on one hand, the contact area between the cooling liquid and the groove wall of the diversion trench 1231 is increased by the protruding part 1232, namely, the convection area between the cooling liquid and the casing 1 is increased, so that the heat dissipation effect of the flywheel 2 energy storage system of the embodiment of the invention is improved, and on the other hand, the protruding part 1232 has a disturbance effect on the cooling liquid in the diversion trench 1231, and when the cooling liquid flows in the diversion trench 1231, the protruding part 1232 increases the turbulence of the cooling liquid, and the convection heat exchange effect between the cooling liquid and the casing 1 is improved, so that the heat dissipation effect of the flywheel 2 energy storage system of the embodiment of the invention is improved.

In some embodiments, the sealing assembly 3 includes an annular portion 31 and a sealing liquid, the annular portion 31 is disposed in the inner cavity and the outer wall of the annular portion 31 is in sealing connection with the housing 1, the annular portion 31 is sleeved on the outer peripheral side of the flywheel 2, and the sealing liquid is filled between the inner wall of the annular portion 31 and the outer peripheral wall of the flywheel 2 to be suitable for connecting the annular portion 31 and the sealing assembly 3 in an annular manner.

Specifically, the sealing assembly 3 includes an annular portion 31 sleeved on the outer peripheral side of the flywheel 2, the outer edge of the annular portion 31 is fixedly and hermetically connected with the inner wall of the inner cavity, a set gap is formed between the inner edge of the annular portion 31 and the outer wall of the flywheel 2, the sealing liquid is filled in the set gap, and the annular portion 31 restrains the sealing liquid in the set gap.

Therefore, the sealing liquid is filled between the annular part 31 and the outer surface of the flywheel 2, on one hand, the annular part 31 is in sealing connection with the flywheel 2, on the other hand, the viscous resistance of the sealing liquid is smaller, the friction effect between the sealing assembly 3 and the flywheel 2 is smaller, the pressure difference between the air in the vacuum cavity and the cooling cavity is larger, the sealing liquid is restrained in a set gap through the annular part 31, the sealing effect of the sealing assembly 3 is convenient to improve, so that the vacuum cavity is kept to be higher in vacuum degree, and the resistance of the flywheel 2 in rotation is reduced.

In some embodiments, the annular portion 31 includes a magnetic ring 311, the flywheel 2 is rotatably mounted to the magnetic ring 311 with an annular gap between the flywheel 2 and the magnetic ring 311, and the sealing fluid is a magnetic fluid adapted to be confined within the annular gap by the magnetic ring 311.

Specifically, the magnetic ring 311 has magnetism, the sealing liquid is magnetic fluid, and the magnetic induction line direction inside the magnetic ring 311 extends along the vertical up-down direction, and under the effect of the magnetic field generated by the magnetic ring 311, the sealing liquid is confined in the annular gap.

Therefore, on one hand, the magnetic fluid has small viscous resistance, so that the resistance of the sealing assembly 3 to the rotation of the flywheel 2 is conveniently reduced, and on the other hand, the magnetic fluid can be filled in the magnetic ring 311

The annular portion 31 includes a magnetism blocking ring 312, and the magnetism blocking ring 312 is disposed between the magnetic ring 311 and the housing 1 and sleeved on the outer peripheral side of the magnetic ring 311, so as to be suitable for increasing the magnetic field strength in the annular gap.

In some embodiments, the inner wall of the magnetic ring 311 is provided with a plurality of annular flanges 3111, the plurality of annular flanges 3111 being spaced apart along the axial direction of the flywheel 2, the annular flanges 3111 protruding towards the flywheel 2 to be adapted to concentrate the magnetic field between the annular flanges 3111 and the flywheel 2.

Thus, the clearance between the inner edges of the plurality of annular flanges 3111 and the outer surface of the flywheel 2 is smaller than the set annular clearance, so that on one hand, sealing effect of the sealing assembly 3 is improved by restraining sealing liquid between the plurality of annular flanges 3111 and the flywheel 2, and on the other hand, the plurality of annular flanges 3111 form multi-stage sealing, and sealing effect of the sealing assembly 3 is improved.

In some embodiments, the housing 1 includes a first shell 11 and a second shell 12, the first shell 11 is disposed on the lower side of the second shell 12, the second shell 12 and the first shell 11 can be combined in a sealing manner to form the housing 1, the first shell 11 is disposed on the outer peripheral side of the rotor portion 22, the upper end of the first shell 11 has an opening for the shaft portion to pass through, and the lower end of the second shell 12 has an opening for the shaft portion to pass through and the lower end of the second shell 12 is in sealing engagement with the upper end of the first shell 11.

Thus, the housing 1 has a vertically split structure, and after the flywheel 2 is mounted on the first housing 11, the second housing 12 is fitted over the upper end of the first housing 11 from the upper side of the flywheel 2, so that the housing 1 can be mounted on the outer peripheral side of the flywheel 2, thereby facilitating assembly of the flywheel 2 and the housing 1. The rotor 22, stator 42, inlet 122, outlet 121 and seal assembly 3 are disposed within the second housing 12 to facilitate machining on the one hand on the smaller second housing 12 and on the other hand to facilitate removal of the second housing 12 from the flywheel 2 for servicing.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.

Claims

1. A flywheel energy storage system, comprising:

the shell is provided with an inner cavity;

a flywheel rotatably mounted within the inner cavity;

the sealing assembly is arranged between the shell and the flywheel to realize rotary sealing between the shell and the flywheel, the sealing assembly divides the inner cavity into a cooling cavity and a vacuum cavity, the vacuum cavity is internally provided with an annular part and sealing liquid, the annular part is arranged in the inner cavity and is in sealing connection with the shell, the annular part is sleeved on the outer peripheral side of the flywheel, the sealing liquid is filled between the inner wall of the annular part and the outer peripheral wall of the flywheel to be suitable for connecting the annular part and the sealing assembly in an annular way, the annular part comprises a magnetic ring and a magnetism isolating ring, the flywheel is rotationally assembled on the magnetic ring and is provided with an annular gap between the flywheel and the magnetic ring, the sealing liquid is magnetic fluid to be suitable for the sealing liquid to be restrained in the annular gap by the magnetic ring, the magnetism isolating ring is arranged between the magnetic ring and the shell and is sleeved on the outer peripheral side of the magnetic ring, the annular flange is provided with a plurality of annular flanges, and the annular flanges are arranged between the annular flanges and the annular flanges are suitable for gathering the annular flanges along the axial direction of the flywheel;

the stator and the rotor are arranged in the cooling cavity, a cooling medium is suitable for being introduced into the cooling cavity to cool the stator and the rotor, the stator is arranged in the shell, and the rotor is arranged in the flywheel and can rotate under the action of the stator;

the flywheel comprises a wheel shaft part and a rotor part, the wheel shaft part extends along the axial direction of the shell, part of the wheel shaft part is positioned in the cooling cavity, the rotor part is arranged on the outer peripheral side of the wheel shaft part so as to improve the rotational inertia of the flywheel, the rotor part is arranged in the vacuum cavity, the upper end and the lower end of the wheel shaft part are respectively provided with an axial magnetic bearing, and the outer diameter of the rotor part is far greater than the maximum diameter of the wheel shaft part;

the shell is provided with an air inlet hole and an air outlet hole, the air inlet hole is communicated with the cooling cavity, the air outlet hole is communicated with the cooling cavity so as to be suitable for air to enter and exit the cooling cavity, the air inlet hole is positioned on the upper side of the stator, the air outlet hole is positioned on the lower side of the stator so as to enable cooling medium to flow between the stator and the rotor, and the air inlet hole is multiple and is arranged along the circumferential interval of the shell.

2. The flywheel energy storage system according to claim 1, wherein the housing is provided with a cooling channel extending in a circumferential direction of the housing and provided on an outer circumferential side of the stator to be adapted to allow a cooling liquid to flow through the housing.

3. The flywheel energy storage system of claim 2, wherein the housing is provided with a flow guide groove provided on an outer peripheral side of the housing and extending in a circumferential direction of the housing, the housing including a seal ring that seals a notch covered on the flow guide groove to form the cooling passage.

4. A flywheel energy storage system according to claim 3, wherein a plurality of protruding parts are arranged in the diversion trench, the protruding parts are arranged between the sealing ring and the bottom of the diversion trench, the protruding parts extend along the circumferential direction of the shell, the protruding parts are provided with diversion parts, the diversion parts are suitable for enabling cooling liquid to flow from one side of the protruding parts to the other side of the protruding parts, the protruding parts are arranged at intervals along the axial direction of the shell, the cooling liquid flows from one side of the protruding parts to the other side of the protruding parts to cool the shell, and the diversion parts of two adjacent protruding parts are arranged oppositely.