Flywheel energy storage system

Abstract

The application discloses a flywheel energy storage system, which comprises a pit, a rotating part, a shell, an end cover, a plurality of locking parts and an auxiliary assembly. The shell is internally provided with a vacuum cavity, the rotating part is rotatably assembled in the vacuum cavity, the shell is arranged in the pit, and one end of the shell is connected with the bottom end of the pit. The end cover is arranged at the pit opening of the pit, at least part of the end cover is arranged between the other end of the shell and the inner wall of the pit, and the end cover surrounds the outer peripheral side of the shell. A plurality of locking parts are arranged on the end cover and are arranged at intervals along the circumference of the end cover. The position of each locking part along the radial direction of the end cover is adjustable, and the plurality of locking parts are adapted to abut against the shell to fix the shell. The auxiliary assembly is arranged on the side of the end cover away from the pit. The flywheel energy storage system has the advantages of high support rigidity of the shell, high rigidity of the shell and convenient maintenance.

Description

Technical Field

[0001] This invention relates to the field of power storage technology, and more specifically, to a flywheel energy storage system. Background Technology

[0002] The energy storage flywheel uses an electric motor to drive rotating components to rotate at high speed, temporarily converting electrical energy into the kinetic energy of the rotating components, storing the electrical energy in the form of the kinetic energy of the rotating components, and then using the rotating components to drive a generator to generate electricity when needed. However, the flywheel energy storage system in related technologies is not easy to maintain and has low stability. Summary of the Invention

[0003] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0004] High-power energy storage flywheels are prone to generating tilting torques during operation, causing the flywheel casing to oscillate radially. The radial support stiffness of the flywheel casing in the related technology flywheel energy storage system is insufficient, and the stiffness of the flywheel casing in the related technology flywheel energy storage system is also insufficient, resulting in low stability of the flywheel energy storage system in the related technology.

[0005] The present invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of the present invention propose a flywheel energy storage system that has the advantages of high support stiffness for the casing and high casing stiffness.

[0006] An embodiment of the present invention provides a flywheel energy storage system comprising: a pit; a rotating component and a housing, wherein the housing has a vacuum chamber, the rotating component is rotatably assembled within the vacuum chamber, the housing is disposed in the pit, and one end of the housing is connected to the bottom of the pit; an end cap, the end cap being disposed at the opening of the pit, and at least a portion of the end cap being disposed between the other end of the housing and the inner wall of the pit, and the end cap surrounding the outer periphery of the housing; and a plurality of locking components, the plurality of locking components being disposed on the end cap and spaced apart circumferentially along the end cap, each locking component being adjustable in position along the radial direction of the end cap, and the plurality of locking components being adapted to abut against the housing to fix the housing.

[0007] The flywheel energy storage system of this invention has the advantages of high support stiffness for the shell, high shell stiffness, and easy maintenance.

[0008] In some embodiments, the pit includes a recess located at the bottom of the pit and extending along the extension direction of the pit, with at least a portion of the shell fitting within the recess.

[0009] In some embodiments, the housing includes a first fixing section and a second fixing section. The first fixing section is disposed at one end of the housing and is fixedly assembled to the end cap, which is fixedly assembled to the inner wall of the pit. The second fixing section is disposed at the other end of the housing and is fixedly assembled to the recess.

[0010] In some embodiments, the end cap includes an annular portion and a cylindrical portion. The annular portion extends in a closed manner along the circumference of the pit, and at least a portion of the annular portion engages with the inner wall of the pit to restrict the position of the end cap. The cylindrical portion extends in a closed manner along the circumference of the first fixing section, and an clearance hole is formed on the inner side of the cylindrical portion. One end of the locking member is detachably connected to the cylindrical portion, and the other end of the locking member abuts against the outer peripheral side of the first fixing section.

[0011] In some embodiments, the annular portion is provided with a flange, the outer edge of which is connected to a portion of the inner wall of the pit, and the cylindrical portion is located on the side of the annular portion away from the pit.

[0012] In some embodiments, the cylindrical portion is provided with a plurality of guide holes, and the locking member includes a guide portion, a fixing portion and a connecting portion. The guide holes extend radially along the cylindrical portion, the guide portion is guided and fitted into the guide holes and passes through the guide holes, the fixing portion is located in the clearance hole to be adapted to fix the radial position of the first fixing segment, and the connecting portion is detachably connected to the outer wall of the cylindrical portion by fasteners to be adapted to provide the fixing portion with a clamping force on the first fixing segment.

[0013] In some embodiments, the flywheel energy storage system includes an auxiliary component disposed on the side of the end cap opposite to the pit.

[0014] In some embodiments, the housing includes a first segment and a second segment disposed between a first fixed segment and a second fixed segment, the first segment being located between the second segment and the first fixed segment, the rotating member including a rotor portion, the housing including a stator portion, the first segment being adapted to assemble the stator portion, the stator portion being provided with wiring, the wiring of the stator portion extending through a predetermined interval between a plurality of locking members to the auxiliary assembly.

[0015] In some embodiments, the first section is provided with a plurality of ventilation slots, the ventilation slots being disposed in the first section and the plurality of ventilation slots being arranged at circumferential intervals along the first section, one end of the ventilation slot communicating with the pit and the other end of the ventilation slot communicating with the clearance hole, so as to cool the first section as the air in the pit flows out of the pit.

[0016] In some embodiments, the inner wall of the clearance hole is provided with an annular groove, the annular groove extends in a closed manner along the circumference of the clearance hole, and the ventilation groove communicates with the annular groove. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a flywheel energy storage system according to an embodiment of the present invention.

[0018] Figure 2 This is a top view of the flywheel energy storage system according to an embodiment of the present invention.

[0019] Figure 3 yes Figure 2 Schematic diagram of cross-section at point AA.

[0020] Figure 4 yes Figure 1 A magnified view of a section at point B.

[0021] Figure 5 This is a cross-sectional schematic diagram of the housing and rotating components of the flywheel energy storage system according to an embodiment of the present invention.

[0022] Figure 6 yes Figure 3 A magnified view of a section at point C.

[0023] Figure label:

[0024] Pit 1; Depression 11;

[0025] Rotating part 2; Rotor part 21; Shaft 22; Flywheel 23;

[0026] Housing 3; First fixing section 31; First section 32; Second section 33; Second fixing section 34; Stator 35; Wiring 351; Ventilation slot 36;

[0027] End cap 4; Annular portion 41; Flange 411; Cylindrical portion 42; Clearance hole 43; Annular groove 431;

[0028] Locking part 5; fixing part 51; guide part 52; connecting part 53;

[0029] Auxiliary component 6; ventilation component 61; vacuum component 62; control component 63. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] The following is combined with Figures 1 to 6 This invention describes a flywheel energy storage system according to an embodiment of the present invention.

[0032] The flywheel energy storage system of this invention includes a pit 1, a rotating component 2, a housing 3, an end cap 4, and multiple locking components 5.

[0033] The housing 3 has a vacuum chamber inside, and the rotating part 2 is rotatably assembled in the vacuum chamber. The housing 3 is located in the pit 1, and one end of the housing 3 is connected to the bottom end of the pit 1.

[0034] Specifically, the shell 3 has a cavity inside, and the air pressure inside the shell 3 is lower than atmospheric pressure to form a vacuum or near-vacuum state, thereby forming a vacuum cavity inside the shell 3. The viscous resistance of the gas in the vacuum cavity is low, so when the rotating part 2 rotates in the vacuum cavity, the air in the vacuum cavity has less resistance to the rotating part 2.

[0035] The vacuum chamber is equipped with a radial magnetic bearing assembly and an axial magnetic bearing assembly. The radial magnetic bearing assembly is used to fix the radial position of the rotating part 2 so that the rotating part 2 rotates around the rotating shaft 22 extending in the vertical direction. The axial magnetic bearing assembly is used to fix the axial position of the rotating part 2 so that the rotating part 2 is separated from the inner wall of the housing 3, thereby reducing the resistance when the rotating part 2 rotates.

[0036] The end cap 4 is located at the opening of the pit 1, and at least part of the end cap 4 is located between the other end of the housing 3 and the inner wall of the pit 1, and the end cap 4 surrounds the outer periphery of the housing 3.

[0037] Specifically, the end cap 4 has a ring structure with an outer edge and an inner edge. The outer edge of the end cap 4 is connected to the inner wall of the pit 1, and the inner edge of the end cap 4 extends and closes along the outer periphery of part of the shell 3. Thus, the end cap 4 covers the pit 1 between the inner wall of the pit 1 and the shell 3 along the radial direction of the pit 1. On the one hand, it isolates the pit 1 from the outside world and prevents debris from entering the pit 1. On the other hand, it facilitates opening the pit 1 by disassembling the end cap 4.

[0038] Multiple locking elements 5 are provided on the end cover 4 and arranged at intervals along the circumference of the end cover 4. The position of each locking element 5 is adjustable along the radial direction of the end cover 4. The multiple locking elements 5 are adapted to abut against the housing 3 to fix the housing 3.

[0039] Specifically, the locking member 5 is located between the end cover 4 and the housing 3. One end of the locking member 5 is connected to the inner edge of the end cover 4, and the other end of the locking member 5 abuts against the outer periphery of the housing 3. The connection position of the locking member 5 and the inner edge of the end cover 4 is adjustable, so that the position of the end of the locking member 5 abutting against the housing 3 relative to the end cover 4 is adjustable. This allows the locking member 5 to apply a clamping force to the housing 3 to fix the position of the housing 3 relative to the end cover 4, thereby fixing the housing 3 in the pit 1.

[0040] In this embodiment of the flywheel energy storage system, the housing 3 is fixed in the pit 1 by setting an end cap 4, so that the housing 3 does not need to include a part that fixes the housing 3 in the pit 1, thereby simplifying the structure of the housing 3. On the one hand, the housing 3 as a whole maintains a circumferential closed extension shape around the axis of rotation of the rotating component 2, which improves the radial stiffness of the housing 3, giving the flywheel energy storage system of this embodiment of the invention the advantage of high rigidity of the housing 3. On the other hand, the housing 3 does not include a component that fixes the upper end of the housing 3 radially in the pit 1, thereby reducing the weight of the housing 3 and making it easier to lift the housing 3 and the rotating component 2 when installing or maintaining the rotating component 2, giving the flywheel energy storage system of this embodiment of the invention the advantage of easy maintenance.

[0041] In this embodiment of the invention, the flywheel energy storage system connects the upper end of the housing 3 to the inner wall of the pit 1 through the end cap 4 and the locking member 5. When the housing 3 is subjected to a torque that drives the housing 3 to swing in its radial direction, the component force extending in the radial direction of the housing 3 is transmitted to the inner wall of the pit 1 through the locking member 5 and the end cap 4. Since the inner wall of the pit 1 has high structural strength, the inner wall of the pit 1 can bear a large force. Therefore, the flywheel energy storage system of this embodiment of the invention has high support stiffness for the housing 3, which improves the stability of the flywheel energy storage system of this embodiment of the invention during operation.

[0042] In some embodiments, the pit 1 includes a recess 11, which is located at the bottom of the pit 1 and extends along the extension direction of the pit 1. At least a portion of the shell 3 is fitted into the recess 11.

[0043] Specifically, the bottom of the pit 1 is located at the lower end of the pit 1, the recess 11 extends downward from the bottom of the pit 1, and the geometric center of the recess 11 coincides with the geometric center of the pit 1. That is, the cross-sectional shape of the recess 11 in the horizontal plane is concentrically arranged with the cross-sectional shape of the pit 1 in the horizontal plane. The lower end of the shell 3 is provided with a protrusion, and the protrusion at the lower end of the shell 3 fits into the recess 11, thereby fixing the lower end of the shell 3 to the pit 1.

[0044] Thus, the lower end of the shell 3 is positioned in the pit 1 through the recess 11. The outer periphery of the lower end of the shell 3 matches the inner wall of the recess 11. On the one hand, the recess 11 fixes the radial position of the lower end of the shell 3, preventing the lower end of the shell 3 from moving radially in the pit 1. When the lower end of the shell 3 is subjected to a force that drives the lower end of the shell 3 to move radially, the outer periphery of the lower end of the shell 3 abuts against the inner wall of the recess 11. Since the inner wall of the recess 11 can bear a large force, the flywheel energy storage system of this embodiment of the invention has high support stiffness for the shell 3.

[0045] On the other hand, the housing 3 is positioned in the pit 1 through the recess 11, which facilitates the installation of the housing 3 and the rotating part 2 in the pit 1 and the lifting of the housing 3 and the rotating part 2 from the pit 1, thereby giving the flywheel energy storage system of the present invention the advantages of easy installation and maintenance.

[0046] In some embodiments, the housing 3 includes a first fixing section 31 and a second fixing section 34. The first fixing section 31 is disposed at one end of the housing 3 and is fixedly assembled to the end cover 4. The end cover 4 is fixedly assembled to the inner wall of the pit 1. The second fixing section 34 is disposed at the other end of the housing 3 and is fixedly assembled to the recess 11.

[0047] Specifically, at least one of the diameter of the first fixing segment 31 and the diameter of the second fixing segment 32 is the minimum diameter of any position of the housing 3. The upper end of the housing 3 forms the first fixing end, and the lower end of the housing 3 forms the second fixing segment 34. The first fixing segment 31 extends upward along the axial direction of the housing 3. The first fixing segment 31 is fitted to the inner edge of the end cover 4, and a plurality of locking members 5 abut against the inner edge of the end cover 4 and the outer periphery of the first fixing segment 31. The protrusion at the lower end of the housing 3 forms the second fixing segment 34, and the outer wall of the second fixing segment 34 is fitted to the inner wall of the recess 11.

[0048] Thus, on the one hand, the upper radial position of the shell 3 is fixed to the pit 1 by the first fixing section 31, and the lower radial position of the shell 3 is fixed to the recess 11 by the second fixing section 34. Since the diameters of the first fixing section 31 and the second fixing section 34 are the minimum diameters of the shell 3, stress concentration is less likely to occur at the first fixing section 31 and the second fixing section 34 when they receive radial support force, thereby making the shell 3 have high rigidity when subjected to lateral support moment.

[0049] On the other hand, the first fixing section 31 is fitted into the end cover 4 and is clamped and fixed by multiple locking members 5, and the second fixing section 34 is fitted into the recess 11, which facilitates the removal of the first fixing section 31 from the end cover 4 and the removal of the second fixing section 34 from the recess 11, thereby facilitating the lifting of the housing 3 and the rotating member 2 during the maintenance of the flywheel energy storage system in this embodiment of the invention.

[0050] In some embodiments, the end cap 4 includes an annular portion 41 and a cylindrical portion 42. The annular portion 41 extends in a closed manner along the circumference of the pit 1, and at least a portion of the annular portion 41 fits into the inner wall of the pit 1 to restrict the position of the end cap 4. The cylindrical portion 42 extends in a closed manner along the circumference of the first fixing section 31, and a clearance hole 43 is formed on the inner side of the cylindrical portion 42. One end of the locking member 5 is detachably connected to the cylindrical portion 42, and the other end of the locking member 5 abuts against the outer peripheral side of the first fixing section 31.

[0051] Specifically, the radial cross-section of the pit 1 is circular, the annular part 41 is a circular annular structure, that is, the annular part 41 has a circular outer edge and a circular inner edge, and the outer edge and the inner edge of the annular part 41 are arranged concentrically, the cylindrical part 42 is a cylindrical structure, that is, the cylindrical part 42 has a cylindrical inner wall surface and a cylindrical outer wall surface, and the inner wall surface and the outer wall surface of the cylindrical part 42 are arranged coaxially, the inner edge of the annular part 41 coincides with the inner wall surface of the cylindrical part 42, or, part of the inner wall surface of the cylindrical part 42 forms the inner edge of the annular part 41.

[0052] The annular portion 41 extends in the horizontal plane, the cylindrical portion 42 extends in the vertical direction, and the cylindrical portion 42 extends upward from the upper surface of the annular portion 41. At least part of the outer edge of the annular portion 41 fits into the inner wall of the pit 1. The inner wall surface of the cylindrical portion 42 extends around the axis of the pit 1 and forms a clearance hole 43.

[0053] The first fixing section 31 is located in the clearance hole 43, and part of the locking member 5 is located in the clearance hole 43. Part of the locking member 5 extends from the cylindrical part 42 radially to the outer periphery of the first fixing section 31. The locking member 5 is detachably connected to the cylindrical part 42, and the position of the connection between the locking member 5 and the cylindrical part 42 is adjustable.

[0054] Therefore, the first fixing section 31 fits into the clearance hole 43, so that part of the housing 3 is located on the upper side of the end cover 4, thereby reducing the overall height of the housing 3 and end cover 4 assembly. This makes the flywheel energy storage system of the present invention have the advantage of compact structure. The cylindrical part 42 increases the thickness of the end cover 4 in the vertical direction, which facilitates the installation of multiple locking parts 5 in the end cover 4. The connection position of the multiple locking parts 5 and the cylindrical part 42 is adjustable. On the one hand, it is convenient for the multiple locking parts 5 to clamp housings 3 of different sizes. On the other hand, by adjusting the connection position of the locking parts 5 and the cylindrical part 42, the clamping force of the locking parts 5 on the first fixing section 31 can be adjusted.

[0055] In some embodiments, the annular portion 41 is provided with a flange 411, the outer edge of which is connected to the inner wall of a portion of the pit 1, and the cylindrical portion 42 is provided on the side of the annular portion 41 away from the pit 1.

[0056] Specifically, the flange 411 protrudes downward from the lower end of the annular portion 41. The flange 411 extends in a closed circle along the axis of the pit 1. The flange 411 has an annular structure and the outer surface of the flange 411 is a cylindrical surface. The nominal size of the diameter of the outer surface of the flange 411 is the same as the nominal size of the upper end of the inner wall of the pit 1, so that the flange 411 can be tightly fitted to the upper edge of the inner wall of the pit 1.

[0057] Therefore, the geometric center of flange 411 coincides with the geometric center of end cap 4. When flange 411 is tightly fitted to the upper edge of the inner wall of pit 1, the geometric center of flange 411 coincides with the geometric center of pit 1, making the geometric center of end cap 4 coincide with the geometric center of pit 1. On the one hand, it is convenient to install end cap 4 centered on pit 1 and to disassemble end cap 4. On the other hand, when rotating member 2 rotates in housing 3 and generates a torque that swings radially along pit 1, the outer surface of flange 411 abuts against the inner wall of pit 1, thereby preventing the upper end of housing 3 from swinging radially along pit 1. Thus, the flywheel energy storage system of this embodiment of the invention has high support stiffness for housing 3.

[0058] In some embodiments, the cylindrical portion 42 is provided with a plurality of guide holes, and the locking member 5 includes a guide portion 52, a fixing portion 51 and a connecting portion 53. The guide holes extend radially along the cylindrical portion 42, the guide portion 52 is guided and fitted into the guide holes and passes through the guide holes, the fixing portion 51 is located in the clearance hole 43 to be adapted to fix the radial position of the first fixing segment 31, and the connecting portion 53 is detachably connected to the outer wall of the cylindrical portion 42 by fasteners to be adapted to provide the fixing portion 51 with a clamping force on the first fixing segment 31.

[0059] Specifically, multiple guide holes correspond one-to-one with multiple locking parts 5. The guide holes penetrate the inner and outer wall surfaces of the cylindrical part 42 radially. The multiple guide holes are arranged at equal intervals along the circumference of the cylindrical part 42. The fixing part 51, the guide part 52 and the connecting part 53 are arranged sequentially connected along the length direction of the locking part 5.

[0060] The guide portion 52 is connected between the fixing portion 51 and the connecting portion 53. The fixing portion 51 is located on the inner side of the inner wall surface of the cylindrical portion 42. The fixing portion 51 includes a fixing groove that extends along the length direction of the first fixing section 31. The connecting portion 53 is located on the outer side of the outer wall surface of the cylindrical portion 42 and is connected to the cylindrical portion 42 by fasteners.

[0061] The extension direction of the guide portion 52 is the same as the extension direction of the guide hole. The guide portion 52 is guided and fitted into the corresponding guide hole. At least part of the first fixing section 31 is fitted into the fixing groove to fix the first fixing section 31. The fastener passes through the connecting portion 53 and is threadedly connected to the cylindrical portion 42. The fastener extends radially along the cylindrical portion 42, and the fastening force generated by the fastener on the connecting portion 53 and the cylindrical portion 42 extends radially along the cylindrical portion 42.

[0062] Therefore, when the locking member 5 is assembled in the guide hole, the fastener connects the connecting part 53 and the cylindrical part 42, and applies a clamping force to the connecting part 53 extending radially along the cylindrical part 42 towards the guide part 52 and the fixing part 51. Since the fastener has high axial strength, it can bear a large clamping force of the locking member 5 on the first fixing section 31, thereby giving the flywheel energy storage system of the present invention a high support stiffness for the housing 3.

[0063] In some embodiments, the flywheel energy storage system includes an auxiliary component 6, which is located on the side of the end cover 4 facing away from the pit 1. Specifically, the auxiliary component 6 is connected to the housing 3 to control the rotational speed of the rotating component 2 within the housing 3, thereby converting electrical energy into the kinetic energy of the rotating component 2. The failure rate of the auxiliary component 6 is higher than that of the housing 3 and the rotating component 2, resulting in a higher maintenance frequency for the auxiliary component 6. The auxiliary component 6 is located on the upper side of the end cover 4, allowing for maintenance of the auxiliary component 6 without opening the end cover 4.

[0064] Therefore, the flywheel energy storage system of this embodiment of the invention, by placing the auxiliary component 6 containing electrical components on the upper side of the end cover 4, eliminates the need to disassemble the end cover 4 to open the pit 1 when inspecting or maintaining the auxiliary component 6. This makes the flywheel energy storage system of this embodiment of the invention easier to maintain compared to the related art's technical solution of placing the controller and other auxiliary components 6 in the pit 1.

[0065] In some embodiments, the housing 3 includes a first segment 32 and a second segment 33, which are disposed between a first fixed segment 31 and a second fixed segment 34. The first segment 32 is located between the second segment 33 and the first fixed segment 31. The rotating member 2 includes a rotor portion 21, and the housing 3 includes a stator portion 35. The first segment 32 is adapted to assemble the stator portion 35. The stator portion 35 is provided with a wiring 351, which extends through a predetermined interval between a plurality of locking members 5 to the auxiliary component 6.

[0066] Specifically, the rotating component 2 includes a rotating shaft 22, a rotor 21, and a flywheel 23. The rotating shaft 22 is arranged vertically, with its upper end rotatably engaged with a first fixed section 31 and its lower end rotatably engaged with a second fixed section 34. The rotor 21 and the flywheel 23 are located on the rotating shaft 22, with the rotor 21 located at the upper end of the flywheel 23. The rotor 21 is adapted to drive the rotating shaft 22 to rotate when the stator 35 is energized, thereby driving the flywheel 23 to rotate and converting electrical energy into the kinetic energy of the flywheel 23.

[0067] The first section 32 is adapted to accommodate the stator section 35 and the rotor section 21 of the rotating member 2. The second section 33 is adapted to accommodate the flywheel 23 of the rotating member 2. The stator section 35 is fixedly fitted to the first section 32. The rotor section 21 is fixedly fitted to the rotating shaft 22 of the rotating member 2. The rotor section 21 is rotatably fitted to the rotor section 21. The stator section 35 has multiple wires 351. One end of the wires 351 is connected to the winding of the stator section 35, and the other end of the wires 351 is connected to the auxiliary component 6.

[0068] Multiple locking elements 5 are arranged circumferentially at intervals along the clearance hole 43, so that there is a set interval between the multiple locking elements 5. The upper wiring 351 extends from the stator part 35 through the clearance hole 43 through the set interval, thereby extending to the upper side of the end cover 4 and connecting with the auxiliary component 6.

[0069] Thus, on the one hand, the first segment 32 is located above the second segment 33, making the first segment 32 closer to the clearance hole 43, which facilitates the wiring 351 to extend from the inside of the housing 3 to the outside of the end cover 4. On the other hand, the stator part 35 provided inside the first segment 32 generates heat during operation, and the proximity of the first segment 32 to the clearance hole 43 facilitates the dissipation of the heat generated by the stator part 35 provided inside the first segment 32 to the upper side of the end cover 4 through the clearance hole 43.

[0070] In some embodiments, the auxiliary component 6 includes a vacuum component 62, a ventilation component 61, and a control component 63. The control component 63 is connected to the stator 35 to drive the rotating member 2 to rotate or to convert the kinetic energy of the rotating member 2 into electrical energy. The ventilation component 61 is adapted to deliver air into the pit 1 to cool the housing 3. The vacuum component 62 is connected to the housing 3 to maintain the vacuum level of the vacuum chamber.

[0071] Specifically, the auxiliary component 6 is located on the upper side of the end cover 4, and the vacuum component 62 includes a vacuum pump and a vacuum tube. The vacuum tube is connected between the vacuum pump and the housing 3, and the vacuum tube is in communication with the housing 3. Thus, the vacuum pump can pump the air in the vacuum chamber to the upper side of the end cover 4 to maintain the vacuum level in the vacuum chamber.

[0072] The end cover 4 is provided with multiple ventilation holes, which are arranged at intervals along the outer periphery of the clearance hole 43. The ventilation assembly 61 includes multiple fans, which correspond one-to-one with the multiple ventilation holes. The fans are adapted to transport the air on the upper side of the end cover 4 to the pit 1 below the end cover 4, thereby reducing the temperature of the air in the pit 1 and thus reducing the temperature of the housing 3.

[0073] The control component 63 is electrically connected to the stator section 35 via wiring 351, thereby controlling the wiring 351 mode of the stator section 35. The stator section 35 drives the rotating member 2 to rotate, converting electrical energy into the kinetic energy of the rotating member 2, or converting the kinetic energy of the rotating member 2 into electrical energy through the relative rotation between the rotor section 21 and the stator section 35.

[0074] Therefore, the auxiliary component 6 has a complex structure, and its failure rate during operation is higher than that of the housing 3 and the rotating part 2. On the one hand, the auxiliary component 6 is located at the top of the end cover 4, so that the auxiliary component 6 does not need to open the end cover 4 during maintenance, thus reducing the workload of maintenance. On the other hand, since the stator part 35 is located in the pit 1 below the end cover 4, the auxiliary component 6 is located above the end cover 4, so that the auxiliary component 6 is in the optimal working temperature, thereby reducing the failure rate of the auxiliary component 6 during operation.

[0075] In some embodiments, the first segment 32 is provided with a plurality of ventilation slots 36. The ventilation slots 36 are provided in the first segment 32 and the plurality of ventilation slots 36 are arranged at intervals along the circumference of the first segment 32. One end of the ventilation slot 36 is connected to the pit 1 and the other end of the ventilation slot 36 is connected to the clearance hole 43, so as to cool the first segment 32 during the process of air flowing out of the pit 1.

[0076] Specifically, multiple ventilation slots 36 extend along the axial direction of the first section 32. The lower end of the first section 32 is provided with an air inlet slot, which extends in a closed manner along the circumference of the first section 32 and is connected to the first section 32. The lower end of the ventilation slot 36 is connected to the annular groove 431, so that air enters the ventilation slot 36 through the annular groove 431. The upper end of the ventilation slot 36 is connected to the clearance hole 43, so that the air in the ventilation slot 36 can be discharged from the pit 1 through the clearance hole 43.

[0077] When the ventilation assembly 61 delivers air from the upper side of the end cover 4 to the pit 1, the air pressure in the pit 1 is higher than the atmospheric pressure on the upper side of the end cover 4. As a result, the air in the pit 1 flows through the ventilation slot 36 to the clearance hole 43 and is discharged from the pit 1. When the air flows through the ventilation slot 36, it carries away the heat generated by the stator 35 to cool down the stator 35.

[0078] Therefore, the stator 35 generates heat during operation, and the heat is radiated to the first section 32. Multiple ventilation slots 36 are arranged at intervals along the circumference of the first section 32. When air moves upward along the ventilation slots 36, the heat in the first section 32 is radiated into the ventilation slots 36 and carried away by the air, thereby reducing the heat in the first section 32. The temperature difference between the first section 32 and the stator 35 increases as the temperature of the first section 32 decreases, and the heat transfer coefficient between the stator 35 and the first section 32 increases, so that the heat generated in the stator 35 is discharged in time through the first section 32, thereby improving the cooling effect on the stator 35.

[0079] In some embodiments, the inner wall of the clearance hole 43 is provided with an annular groove 431, which extends in a closed manner along the circumference of the clearance hole 43, and the ventilation groove 36 communicates with the annular groove 431.

[0080] Specifically, the annular groove 431 is located at the lower end of the clearance hole 43. The lower end of the annular groove 431 is connected to the lower end face of the end cover 4, and the inner diameter of the lower end of the annular groove 431 is larger than the inner diameter of the upper end of the annular groove 431. Multiple ventilation grooves 36 are connected to the annular groove 431, that is, the projection of the upper opening of the multiple ventilation grooves 36 in the horizontal plane falls within the projection of the annular groove 431 in the horizontal plane.

[0081] Furthermore, the projection of the upper openings of the multiple ventilation slots 36 in the horizontal plane is located on the outer periphery of the projection of the upper opening of the clearance hole 43 in the horizontal plane, that is, the projection of the upper openings of the multiple ventilation slots 36 in the horizontal plane does not coincide with the projection of the upper opening of the clearance hole 43 in the horizontal plane.

[0082] Therefore, multiple ventilation slots 36 are connected to the clearance hole 43 through the annular slot 431, and the upper opening of the ventilation slot 36 and the upper opening of the clearance hole 43 do not coincide in the vertical direction, thereby preventing foreign objects from blocking the ventilation slot 36 when they fall into the clearance hole 43.

[0083] In the description of this 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0085] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0086] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0087] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0088] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A flywheel energy storage system, characterized in that, include: pit; A rotating component and a housing, wherein a vacuum cavity is provided inside the housing, the rotating component is rotatably assembled inside the vacuum cavity, the housing is disposed in the pit, and one end of the housing is connected to the bottom end of the pit; An end cap is provided at the opening of the pit, and at least part of the end cap is provided between the other end of the housing and the inner wall of the pit, and the end cap surrounds the outer periphery of the housing. A plurality of locking elements are disposed on the end cap and arranged at circumferential intervals along the end cap. The position of each locking element is adjustable along the radial direction of the end cap. The plurality of locking elements are adapted to abut against the housing to fix the housing. The housing includes a first fixing section, which is located at one end of the housing and is fixedly assembled to the end cap, which is fixedly assembled to the inner wall of the pit. The end cap includes an annular portion and a cylindrical portion. The annular portion extends in a closed manner along the circumference of the pit, and at least a portion of the annular portion fits into the inner wall of the pit to restrict the position of the end cap. The cylindrical portion extends in a closed manner along the circumference of the first fixing section, and a clearance hole is formed on the inner side of the cylindrical portion. One end of the locking member is detachably connected to the cylindrical portion, and the other end of the locking member abuts against the outer circumference of the first fixing section. The cylindrical portion is provided with multiple guide holes. The locking member includes a guide portion, a fixing portion, and a connecting portion. The guide holes extend radially along the cylindrical portion. The guide portion is guided and fitted into the guide holes and passes through the guide holes. The fixing portion is located in the clearance hole to fix the radial position of the first fixing segment. The connecting portion is detachably connected to the outer wall of the cylindrical portion by fasteners to provide a clamping force on the first fixing segment for the fixing portion.

2. The flywheel energy storage system according to claim 1, characterized in that, The pit includes a recess located at the bottom of the pit and extending along the extension direction of the pit, with at least a portion of the shell fitting within the recess.

3. The flywheel energy storage system according to claim 2, characterized in that, The housing also includes a second fixing section, which is located at the other end of the housing and is fixedly assembled to the recess.

4. The flywheel energy storage system according to claim 1, characterized in that, The annular portion is provided with a flange, the outer edge of which is connected to a portion of the inner wall of the pit, and the cylindrical portion is located on the side of the annular portion away from the pit.

5. The flywheel energy storage system according to claim 3, characterized in that, It includes an auxiliary component, which is located on the side of the end cap opposite to the pit.

6. The flywheel energy storage system according to claim 5, characterized in that, The housing includes a first section and a second section, which are disposed between a first fixed section and a second fixed section. The first section is located between the second section and the first fixed section. The rotating member includes a rotor portion, and the housing includes a stator portion. The first section is adapted to assemble the stator portion. The stator portion is provided with wiring, which extends through a predetermined interval between a plurality of locking members to the auxiliary assembly.

7. The flywheel energy storage system according to claim 6, characterized in that, The first section is provided with a plurality of ventilation slots, which are arranged at intervals along the circumference of the first section. One end of each ventilation slot is connected to the pit, and the other end is connected to the clearance hole, so as to cool the first section as the air in the pit flows out of the pit.

8. The flywheel energy storage system according to claim 7, characterized in that, The inner wall of the clearance hole is provided with an annular groove, which extends in a closed manner along the circumference of the clearance hole, and the ventilation groove communicates with the annular groove.

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