Flywheel energy storage rotor heat dissipation system and method

Abstract

The invention discloses a flywheel energy storage rotor heat dissipation system and method, and belongs to the technical field of flywheel energy storage, and the flywheel energy storage rotor heat dissipation system comprises a flywheel rotor, a machine shell, an upper end cover, a base and a liquid supply device. A rotating shaft of the flywheel rotor is hollow; a sealed cavity is formed by the machine shell, the upper end cover and the base. A sliding block in the liquid supply device can reciprocate on the inner wall of a guide pipe arranged in a hollow rotating shaft in a penetrating manner under the action of an upper electromagnet and a lower electromagnet; cooling liquid in a liquid storage cavity in the base is conveyed to the top of the guide pipe through the sliding block and sprayed to the inner wall of the shaft core hole from a liquid passing hole in the top of the guide pipe, and heat is taken away. After the cooling liquid slides down to the liquid storage pool of the base, the cooling liquid exchanges heat with the outside through the radiating ribs of the base, so that the temperature of the cooling liquid is reduced, and then the cooling liquid flows back to the liquid storage cavity. The flywheel rotor can be effectively cooled by cooling liquid through reciprocating motion of the sliding block, failure of parts caused by high temperature is avoided, and therefore safe and stable operation of a flywheel energy storage system is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of flywheel energy storage, and in particular relates to a flywheel energy storage rotor heat dissipation system and method in a vacuum environment. Background Art

[0002] The rotor of the flywheel energy storage motor runs in a vacuum environment, and for the fully magnetically suspended flywheel rotor, since there is no direct contact between the stator and the rotor, the heat dissipation condition of the rotor is poor. The failure to transfer the heat on the rotor may not only cause the permanent magnets in the permanent magnet motor to fail, but also destroy the strength of the entire rotor, thus affecting the normal operation of the flywheel energy storage system. Summary of the invention

[0003] In view of the difficulty in heat dissipation of the flywheel energy storage rotor, the present invention aims to provide a heat dissipation system and method for the flywheel energy storage rotor, wherein the coolant in the liquid storage chamber is sprayed on the inner wall of the shaft core hole through a liquid supply device, and the coolant slides into the liquid storage tank of the base after absorbing heat, and in the process of returning to the liquid storage chamber, the heat exchange with the external air is enhanced through the heat dissipation ribs, so that the temperature of the coolant in the liquid storage chamber is at a lower level, and then the coolant is sprayed on the inner wall of the shaft core hole through the liquid supply device. In this cycle, the flywheel rotor is effectively cooled.

[0004] In order to achieve the above object, the technical solution adopted by the present invention to solve its technical problem is:

[0005] A flywheel energy storage rotor heat dissipation system comprises a flywheel rotor, a casing, an upper end cover, a base and a liquid supply device;

[0006] The liquid supply device includes a conduit, an electromagnet and a slider containing a permanent magnet. The flywheel rotor center has an axial core hole, the conduit is connected to the axial core hole and has an outer diameter smaller than the inner diameter of the axial core hole. The electromagnet is connected to both ends of the conduit. The upper and lower side walls of the conduit both have liquid holes. The slider is slidably connected to the conduit and can slide up and down along the axial direction of the conduit.

[0007] The base includes an upper liquid storage tank for containing cooling liquid and a lower liquid storage cavity. The liquid storage tank is connected to the liquid storage cavity through a side liquid return channel. A tortuous liquid path is provided on the liquid storage tank, and the tortuous liquid path is connected to the liquid return channel. The conduit passes through the liquid storage tank and the lower end is located in the liquid storage cavity.

[0008] Based on the above technical solution, the present invention can also make the following improvements.

[0009] Further, the tortuous liquid path is composed of a plurality of concentric annular grooves of different diameters which are coaxial with the catheter and which spread outward in sequence around the catheter, each of which has a liquid outlet so that adjacent annular grooves can be interconnected, and the annular groove with the largest diameter is connected to the liquid return channel; or, the tortuous liquid path is a spiral groove which continuously increases around the catheter, and the end of the spiral groove is connected to the liquid return channel; or, the tortuous liquid path is an S-shaped groove which is evenly distributed around the catheter and radiates outward, and the end of the S-shaped groove is connected to the liquid return channel.

[0010] Furthermore, the base also includes heat dissipation ribs, and the heat dissipation ribs are evenly distributed outside the liquid storage cavity of the base.

[0011] Furthermore, a plurality of heat dissipation ribs are evenly connected to the outer wall of the liquid storage cavity and are connected to the liquid storage tank, radiating from the edge of the liquid storage cavity to the edge of the liquid storage tank.

[0012] Furthermore, the liquid storage tank, the liquid storage cavity, the shaft core hole and the flywheel rotor are coaxial, the diameter of the liquid storage cavity is smaller than the diameter of the liquid storage tank, a through-tube hole is opened on the base at a position coinciding with the shaft center, the conduit passes through the through-tube hole and the lower end is located in the liquid storage cavity.

[0013] Further, the flywheel rotor comprises a flywheel shaft, a rotor portion of a permanent magnet motor connected to the flywheel rotor, and a rotor portion of a radial magnetic bearing, and the shaft core hole is axially opened at the center of the flywheel shaft;

[0014] The housing is connected with the stator part of the permanent magnet motor, the stator part of the radial magnetic suspension bearing and the axial magnetic suspension bearing. The housing, the upper end cover and the base form a sealed cavity.

[0015] Preferably, the upper part of the conduit passes through the axial core hole to be connected to the upper end cover, and the lower part passes through the pipe hole in the middle of the base to separate the liquid storage tank and the liquid storage cavity.

[0016] Furthermore, the conduit is a round tube made of magnetic isolation material, the permanent magnet is cylindrical, and the magnetization direction of the permanent magnet is axial magnetization; the magnetic pole of the electromagnet can be adjusted.

[0017] Preferably, two circles of liquid holes are respectively provided at both ends of the conduit, the distance between the two circles of liquid holes is greater than the thickness of the permanent magnet, and one circle is close to the electromagnet to ensure that the coolant can smoothly enter and exit the conduit, and the slider also includes a sealing ring connected to the outer wall of the permanent magnet, and the sealing ring is close to the inner wall of the conduit.

[0018] Based on any of the heat dissipation systems described above, the present invention also provides a flywheel energy storage rotor heat dissipation method.

[0019] A method for heat dissipation of a flywheel energy storage rotor adopts any of the heat dissipation systems described above, wherein the coolant enters the conduit from the liquid storage cavity, and then is sprayed from the liquid hole at the top of the conduit to the inner wall of the shaft core hole as the slider moves upward, flows downward into the liquid storage tank, and diffuses along a tortuous liquid path, and finally flows into the liquid storage cavity through a return liquid channel.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The coolant in the liquid storage chamber in the base is transported to the top of the conduit by the slider and sprayed from the liquid hole at the top of the conduit to the inner wall of the shaft core hole to take away the heat; after the coolant slides into the liquid storage tank of the base, it uses the heat dissipation ribs of the base to exchange heat with the outside to reduce the temperature of the coolant, and then flows back to the liquid storage chamber.

[0022] Each concentric annular groove is provided with a liquid outlet, so that adjacent annular grooves can be connected to each other, and the annular groove with the largest diameter is connected to the liquid return channel. After the coolant is discharged from the two circles of liquid outlets at the upper end and sprayed onto the inner wall of the shaft core hole, it flows downward along the axial direction into the liquid reservoir, and then diffuses outward through the liquid outlet from the smaller concentric annular grooves on the inside to the largest concentric annular groove on the outside, thereby greatly increasing the heat dissipation area of ​​the coolant, improving the heat dissipation effect of the coolant, and reducing the coolant temperature.

[0023] A plurality of heat dissipation ribs are evenly distributed around the liquid storage cavity and connected to the liquid storage tank, radiating from the edge of the liquid storage cavity to the edge of the liquid storage tank, contacting both the outer wall of the liquid storage cavity and the outer wall of the liquid storage tank, and simultaneously dissipating heat to the coolant in the liquid storage cavity and the liquid storage tank, thereby improving the cooling effect.

[0024] Two circles of liquid holes are respectively opened at both ends of the catheter, and the distance between the two circles of liquid holes is greater than the thickness of the permanent magnet. One circle is close to the electromagnet, and the edge of the electromagnet facing the permanent magnet is located between the highest point and the lowest point of the liquid hole adjacent to it. When the slider reciprocates, the liquid hole adjacent to the electromagnet ensures that no liquid accumulates between the slider and the electromagnet.

[0025] The present invention transports the coolant to the top of the conduit through the reciprocating motion of the slider and sprays it from the liquid hole at the top of the conduit to the inner wall of the shaft core hole, taking away the heat, and then expanding the heat dissipation area through the tortuous liquid path, and improving the heat exchange capacity with the outside world through the heat dissipation ribs, so that the coolant can effectively cool the flywheel rotor. At the same time, the coolant itself will not heat up too quickly, avoiding failure of components due to high temperature, thereby ensuring the safe and stable operation of the flywheel energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall cross-sectional structure of a flywheel energy storage rotor heat dissipation system of the present invention;

[0027] Figure 2A cross-sectional view of a base of a flywheel energy storage rotor heat dissipation system of the present invention;

[0028] Figure 3 A cross-sectional view of a heat dissipation rib and related structures of a flywheel energy storage rotor heat dissipation system of the present invention;

[0029] Figure 4 A schematic structural diagram of a tortuous liquid path and liquid path flow direction of a flywheel energy storage rotor heat dissipation system of the present invention;

[0030] Figure 5 A schematic structural diagram of a liquid supply device of a flywheel energy storage rotor heat dissipation system of the present invention;

[0031] Figure 6 The figures are of filling and unloading of a flywheel energy storage rotor heat dissipation system of the present invention, wherein (a) is a figure of filling, (b) is a figure of starting to unload, (c) is a figure of completing unloading, (d) is a figure of the slider descending to the middle of the conduit, and (e) is a figure of the slider descending to the bottom of the conduit.

[0032] In the figure, 1-flywheel rotor; 11-flywheel shaft; 111-shaft core hole; 12-rotor part of permanent magnet motor; 13-rotor part of radial magnetic bearing; 2-casing; 21-stator part of permanent magnet motor; 22-stator part of radial magnetic bearing; 23-axial magnetic bearing; 3-upper end cover; 4-base; 41-liquid storage tank; 411-liquid outlet; 42-liquid storage cavity; 43-heat dissipation ribs; 44-liquid return channel; 45-pipe hole; 5-liquid supply device; 51-conduit; 511-liquid outlet; 52-electromagnet; 53-slider; 531-permanent magnet; 532-sealing ring. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0035] All structures not specifically described in the present invention already exist in the prior art and can be directly obtained from the prior art.

[0036] A flywheel energy storage rotor heat dissipation system comprises a flywheel rotor, a casing, an upper end cover, a base and a liquid supply device;

[0037] The liquid supply device includes a conduit, an electromagnet and a slider including a permanent magnet. The flywheel rotor center has an axial core hole, the conduit is connected to the axial core hole and has an outer diameter smaller than the inner diameter of the axial core hole. The upper and lower side walls of the conduit both have liquid holes. The electromagnet is connected to both ends of the conduit. The upper and lower side walls of the conduit both have liquid holes. The slider is slidably connected to the conduit and can slide up and down along the axial direction of the conduit.

[0038] The base includes an upper liquid storage tank for containing cooling liquid and a lower liquid storage cavity. The liquid storage tank is connected to the liquid storage cavity through a side liquid return channel. A tortuous liquid path is provided on the liquid storage tank, and the tortuous liquid path is connected to the liquid return channel. The conduit passes through the liquid storage tank and the lower end is located in the liquid storage cavity.

[0039] Based on the above technical solution, the present invention can also make the following improvements.

[0040] Further, the tortuous liquid path is composed of a plurality of concentric annular grooves of different diameters which are coaxial with the catheter and which spread outward in sequence around the catheter, each of which has a liquid outlet so that adjacent annular grooves can be interconnected, and the annular groove with the largest diameter is connected to the liquid return channel; or, the tortuous liquid path is a spiral groove which continuously increases around the catheter, and the end of the spiral groove is connected to the liquid return channel; or, the tortuous liquid path is an S-shaped groove which is evenly distributed around the catheter and radiates outward, and the end of the S-shaped groove is connected to the liquid return channel.

[0041] Furthermore, the base also includes heat dissipation ribs, and the heat dissipation ribs are evenly distributed outside the liquid storage cavity of the base.

[0042] Furthermore, a plurality of heat dissipation ribs are evenly connected to the outer wall of the liquid storage cavity and are connected to the liquid storage tank, radiating from the edge of the liquid storage cavity to the edge of the liquid storage tank.

[0043] Furthermore, the liquid storage tank, the liquid storage cavity, the shaft core hole and the flywheel rotor are coaxial, the diameter of the liquid storage cavity is smaller than the diameter of the liquid storage tank, a through-tube hole is opened on the base at a position coinciding with the shaft center, the conduit passes through the through-tube hole and the lower end is located in the liquid storage cavity.

[0044] Further, the flywheel rotor comprises a flywheel shaft, a rotor portion of a permanent magnet motor connected to the flywheel rotor, and a rotor portion of a radial magnetic bearing, and the shaft core hole is axially opened at the center of the flywheel shaft;

[0045] The housing is connected with the stator part of the permanent magnet motor, the stator part of the radial magnetic suspension bearing and the axial magnetic suspension bearing. The housing, the upper end cover and the base form a sealed cavity.

[0046] Preferably, the upper part of the conduit passes through the axial core hole to be connected to the upper end cover, and the lower part passes through the pipe hole in the middle of the base to separate the liquid storage tank and the liquid storage cavity.

[0047] Furthermore, the conduit is a round tube made of magnetic isolation material, the permanent magnet is cylindrical, and the magnetization direction of the permanent magnet is axial magnetization; the magnetic pole of the electromagnet can be adjusted.

[0048] Preferably, two circles of liquid holes are respectively provided at both ends of the conduit, the distance between the two circles of liquid holes is greater than the thickness of the permanent magnet, and one circle is close to the electromagnet to ensure that the coolant can smoothly enter and exit the conduit, and the slider also includes a sealing ring connected to the outer wall of the permanent magnet, and the sealing ring is tightly attached to the inner wall of the conduit.

[0049] Based on any of the heat dissipation systems described above, the present invention also provides a flywheel energy storage rotor heat dissipation method.

[0050] A method for heat dissipation of a flywheel energy storage rotor adopts the heat dissipation system described in any of the above items, including a liquid storage tank and a liquid storage cavity. The coolant enters the conduit from the liquid storage cavity, and then sprays from the liquid hole at the top of the conduit to the inner wall of the shaft core hole as the slider moves upward, flows downward into the liquid storage tank, and diffuses along a tortuous liquid path, and finally flows into the liquid storage cavity through a return liquid channel.

[0051] Example 1

[0052] like Figure 1-6 As shown, a flywheel energy storage rotor heat dissipation system according to an embodiment of the present invention includes a flywheel rotor 1, a casing 2, an upper end cover 3, a base 4 and a liquid supply device 5.

[0053] Specifically, the flywheel rotor 1 includes a flywheel shaft 11, a rotor part 12 of a permanent magnet motor fixed on the flywheel rotor 1, and a rotor part 13 of a radial magnetic bearing. A shaft core hole 111 is axially opened in the middle of the flywheel shaft 11, a conduit is connected in the shaft core hole 111, the conduit 51 is connected in the shaft core hole 111 and its outer diameter is smaller than the inner diameter of the shaft core hole 111, and liquid holes 511 are opened on the upper side wall and the lower side wall of the conduit 51.

[0054] The housing 2 is fixedly connected with a stator part 21 of a permanent magnet motor, a stator part 22 of a radial magnetic bearing and an axial magnetic bearing 23. The housing 2, the upper end cover 3 and the base 4 form a sealed cavity, and the flywheel rotor 1 is rotatably disposed in the cavity.

[0055] The base 4 includes an upper liquid reservoir 41, a lower liquid reservoir cavity 42, heat dissipation ribs 43, a liquid return channel 44 and a tube hole 45. The liquid reservoir 41 is connected to the liquid reservoir cavity 42 through the liquid return channel 44. A tortuous liquid path is provided on the liquid reservoir 41, and the tortuous liquid path is connected to the liquid return channel 44. The conduit 51 passes through the liquid reservoir 41 and the lower end is located in the liquid reservoir cavity 42.

[0056] The liquid supply device 5 includes a conduit 51, an electromagnet 52 and a slider 53. The electromagnet 52 is fixedly connected to both ends of the conduit 51. The slider 53 is slidably connected to the inner wall of the conduit 51 and can reciprocate in the conduit 51. The shape of the slider 53 is adapted to the cross-sectional shape of the conduit, and the diameter is slightly smaller than the inner diameter of the conduit 51, so that the slider 53 can move back and forth up and down along the axis of the conduit 51. Preferably, the conduit 51 and the tube hole 45 are sealed by a sealing ring 532.

[0057] A through-tube hole 45 is opened in the middle of the base 4, and the through-tube hole 45 is connected to the liquid storage chamber 42. The conduit 51 passes through the shaft core hole 111 of the flywheel shaft 11, and the upper part is fixedly connected to the upper end cover 3, and the lower part passes through the through-tube hole 45 in the middle of the base 4, separating the liquid storage tank 41 and the liquid storage chamber 42, and its lower end is located in the liquid storage chamber 42.

[0058] A liquid return channel 44 is opened on the side of the liquid storage cavity 42. One end of the liquid return channel 44 is connected to the liquid storage cavity 42, and the other end is connected to the liquid storage tank 41. The liquid storage tank 41 and the liquid storage cavity 42 are filled with cooling liquid.

[0059] Furthermore, the liquid storage tank 41 of the base 4 is arranged with a tortuous liquid path, and heat dissipation ribs 43 are evenly distributed outside the liquid storage cavity 42 of the base 4 .

[0060] Furthermore, the liquid return channel 44 is opened on the side of the liquid storage chamber 42 and connects the liquid storage chamber 42 and the tortuous liquid path. Preferably, the tortuous liquid path is composed of a plurality of concentric annular grooves of different diameters coaxial with the conduit 51 and spreading outwards around the conduit 51 in sequence.

[0061] In this embodiment, each concentric annular groove is provided with a liquid outlet 411, so that adjacent annular grooves can be interconnected, and one end of the liquid return channel 44 is connected to the liquid storage chamber 42, and the other end is connected to the annular groove with the largest diameter. Preferably, the liquid outlets 411 of different concentric annular grooves are on a straight line, and more preferably, the liquid outlets 411 of different concentric annular grooves pass through the diameter of the concentric annular groove. Of course, the tortuous liquid path can also be other shapes, such as a spiral groove that continuously increases around the conduit 51, and the end of the spiral groove is connected to the liquid return channel 44; a circle of S-shaped grooves that are evenly distributed around the conduit 51 and radiate outward, and the end of the S-shaped groove is connected to the liquid return channel 44, which can be either flat or arranged in a stepped shape, with the highest near the conduit and the lowest at the periphery.

[0062] Figure 2 It is a cross-sectional view of a base of a flywheel energy storage rotor heat dissipation system of the present invention, showing a tortuous liquid path in the shape of a plurality of concentric annular grooves; Figure 3The figure is a cross-sectional view of the heat dissipation ribs 43 and related structures of a flywheel energy storage rotor heat dissipation system of the present invention. A plurality of heat dissipation ribs 43 are evenly connected to the outer wall of the liquid storage cavity 42 and are connected to the liquid storage tank 41, radiating from the edge of the liquid storage cavity 42 to the edge of the liquid storage tank 41. The sum of the heat dissipation ribs 43 and the radius of the liquid storage cavity 42 is not less than the radius of the maximum annular groove of the liquid storage tank 41, so that the heat dissipation ribs 43 pass completely through the liquid storage tank 41. The heat dissipation ribs 43 are located below the liquid storage tank 41, in contact with both the outer wall of the liquid storage cavity 42 and the outer wall of the liquid storage tank 41, to improve the heat dissipation effect. Figure 1 and Figure 2 As shown, the liquid supply device 5 sprays the coolant in the liquid storage chamber 41 on the inner wall of the shaft core hole 111, and the coolant absorbs heat and slides into the liquid storage tank 41 of the base 4. In the process of returning to the liquid storage chamber 42, the heat exchange with the external air is enhanced through the heat dissipation ribs 43, so that the temperature of the coolant in the liquid storage chamber 42 is at a lower level, and the liquid supply device 5 sprays the coolant on the inner wall of the shaft core hole 111 again. In this cycle, the flywheel rotor 1 is effectively cooled.

[0063] like Figure 4 As shown, it is a structural schematic diagram of a tortuous liquid path and liquid path flow direction of a flywheel energy storage rotor heat dissipation system according to an embodiment of the present invention, and one form of the tortuous liquid path and liquid path flow direction of the liquid storage tank 41 is also marked.

[0064] Figure 5 A schematic structural diagram of a liquid supply device of a flywheel energy storage rotor heat dissipation system of the present invention, specifically, the conduit 51 is a round tube made of magnetic isolation material, and evenly distributed liquid holes 511 are respectively opened on the sides of both ends of the conduit 51.

[0065] More specifically, two circles of liquid holes 511 are respectively opened at both ends of the conduit 51, and the distance between the two circles of liquid holes 511 is slightly larger than the thickness of the permanent magnet 531, so as to ensure that the coolant can smoothly enter the conduit 51, and one circle is close to the electromagnet 52. Taking the two circles of liquid holes 511 close to the base 4, i.e., the lower end of the conduit 51 as an example, the circle of liquid holes 511 close to the permanent magnet 531 is mainly used for filling liquid, and is a liquid filling hole; the circle of liquid holes 511 far from the permanent magnet 531 is mainly used for unloading liquid, and is a liquid unloading hole. The edge of the electromagnet 52 facing the permanent magnet 531 is located between the highest point and the lowest point of the liquid unloading hole. When the slider 53 moves downward, the liquid unloading hole ensures that there is no liquid accumulation between the slider 53 and the lower end electromagnet 52. When the liquid levels inside and outside the conduit 51 are level, i.e., the coolant reflux is completed, the slider 53 moves upward, and the coolant is discharged from the liquid holes 511 at the upper end of the conduit 51. The two circles of liquid holes 511 at the upper end are both used for unloading liquid. It should be noted that the two circles of liquid holes 511 at the lower end are located in the liquid storage cavity 42 after the catheter 51 is installed, and the two circles of liquid holes 511 at the upper end are located in the shaft core hole 111 after the catheter 51 is installed.

[0066] Specifically, the magnetic poles of the electromagnet 52 are adjustable, and the electromagnets 52 at both ends are sealedly connected to the inner walls of the conduit 51 at both ends.

[0067] The magnetic poles of the electromagnet 52 can be adjusted at any time according to the reciprocating motion requirements of the slider 53, i.e., the permanent magnet 531 in the catheter 51. Each time the slider reaches the upper limit and the lower limit, the end face of the electromagnet is used to straighten it to avoid the situation of becoming more and more deviated in the later stage.

[0068] More specifically, when the slider 53 needs to move from bottom to top, the current direction of the bottom electromagnet 52 is changed to change its magnetic pole direction so that it repels the slider 53, and at the same time, the top electromagnet 52 is adjusted to attract the slider 53; vice versa.

[0069] Specifically, the slider 53 includes a permanent magnet 531 and a sealing ring 532 fixed on the outer wall of the permanent magnet 531 , and the sealing ring 532 is in close contact with the inner wall of the conduit 51 .

[0070] More specifically, the permanent magnet 531 is cylindrical, and the magnetization direction of the permanent magnet 531 is axial magnetization.

[0071] Figure 6 Figure 1 is a diagram of the liquid filling and liquid discharge of a flywheel energy storage rotor heat dissipation system of the present invention, wherein (a) is a liquid filling diagram, (b) is a diagram of the start of liquid discharge, (c) is a diagram of the completion of liquid discharge, (d) is a diagram of the slider moving down to the middle of the conduit 51, and (e) is a diagram of the slider 53 moving down to the bottom of the conduit 51. In the initial state, the coolant is in the liquid storage chamber 42, and the liquid levels inside and outside the conduit 51 are flush, as shown in FIG. Figure 6 When working, the slider 53 moves upward, so that the coolant is sprayed from the two circles of liquid holes 511 at the upper end of the guide tube 51 to the inner wall of the shaft core hole 111, and flows downward along the axial direction into the liquid storage tank 41, as shown in FIG. Figure 6 Then, the coolant diffuses outward through the liquid outlet 411 into each concentric annular groove, thereby increasing the heat dissipation area of ​​the coolant, and exchanges heat with the outside through the heat dissipation ribs 43 to dissipate the heat. After the coolant in the conduit 51 is completely discharged, the slider 53 moves downward until the bottom of the conduit 51 contacts the electromagnet 52, as shown in FIG. Figure 6 As shown in (d) and (e), the coolant in the liquid reservoir 41 flows back into the liquid reservoir cavity 42. The heat dissipation ribs 43 are in contact with both the outer wall of the liquid reservoir cavity 42 and the outer wall of the liquid reservoir 41, and dissipate heat from the coolant in the liquid reservoir cavity 42 and the liquid reservoir 41, thereby improving the cooling effect.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flywheel energy storage rotor heat dissipation system, comprising a flywheel rotor (1), a housing (2), an upper end cover (3), a base (4) and a liquid supply device (5), characterized in that: The liquid supply device (5) comprises a conduit (51), an electromagnet (52) and a slider (53) including a permanent magnet (531); the flywheel rotor (1) has an axial core hole (111) at its center; the conduit (51) is connected to the axial core hole (111) and has an outer diameter smaller than the inner diameter of the axial core hole (111); the electromagnet (52) is connected to both ends of the conduit (51); the upper side wall and the lower side wall of the conduit (51) both have liquid holes (511); the slider (53) is slidably connected to the conduit (51) and can slide up and down along the axial direction of the conduit (51); The base (4) comprises an upper liquid storage tank (41) for containing cooling liquid and a lower liquid storage cavity (42); the liquid storage tank (41) and the liquid storage cavity (42) are connected via a liquid return channel (44); a tortuous liquid path is provided on the liquid storage tank (41), the tortuous liquid path is connected to the liquid return channel (44); the conduit (51) passes through the liquid storage tank (41) and the lower end is located in the liquid storage cavity (42).

2. A flywheel energy storage rotor heat dissipation system according to claim 1, characterized in that: The tortuous liquid path is composed of a plurality of concentric annular grooves of different diameters which are coaxial with the conduit (51) and which spread outward in sequence around the conduit (51), each of which has a liquid outlet (411) so that adjacent annular grooves can communicate with each other, and the annular groove with the largest diameter is connected to the liquid return channel (44); or, the tortuous liquid path is a spiral groove which continuously increases around the conduit (51), and the end of the spiral groove is connected to the liquid return channel (44); or, the tortuous liquid path is an S-shaped groove which is uniformly distributed around the conduit (51) and radiates outward, and the end of the S-shaped groove is connected to the liquid return channel (44).

3. A flywheel energy storage rotor heat dissipation system according to claim 1, characterized in that: The base (4) further comprises heat dissipation ribs (43), and the heat dissipation ribs (43) are evenly distributed outside the liquid storage cavity (42) of the base (4).

4. A flywheel energy storage rotor heat dissipation system according to claim 3, characterized in that: A plurality of heat dissipation ribs (43) are evenly connected to the outer wall of the liquid storage cavity (42) and are connected to the liquid storage tank (41), radiating from the edge of the liquid storage cavity (42) to the edge of the liquid storage tank (41).

5. A flywheel energy storage rotor heat dissipation system according to claim 1, characterized in that: The liquid storage tank (41), the liquid storage cavity (42), the shaft core hole (111) and the flywheel rotor (1) are coaxial, the diameter of the liquid storage cavity (42) is smaller than the diameter of the liquid storage tank (41), a through-tube hole (45) is provided on the base (4) at a position coincident with the shaft center, the conduit (51) passes through the through-tube hole (45) and the lower end is located in the liquid storage cavity (42).

6. A flywheel energy storage rotor heat dissipation system according to claim 1, characterized in that: The flywheel rotor (1) comprises a flywheel shaft (11), a rotor portion (12) of a permanent magnet motor connected to the flywheel rotor (1), and a rotor portion (13) of a radial magnetic bearing, wherein the shaft core hole (111) is axially opened at the center of the flywheel shaft (11); The housing (2) is connected to a stator portion (21) of a permanent magnet motor, a stator portion (22) of a radial magnetic suspension bearing, and an axial magnetic suspension bearing (23); the housing (2), an upper end cover (3), and a base (4) form a sealed cavity.

7. A flywheel energy storage rotor heat dissipation system according to claim 5, characterized in that: The upper part of the conduit (51) passes through the shaft core hole (111) to be connected to the upper end cover (3), and the lower part passes through the pipe hole (45) in the middle of the base (4) to separate the liquid storage tank (41) and the liquid storage chamber (42).

8. A flywheel energy storage rotor heat dissipation system according to claim 1, characterized in that: The conduit (51) is a circular tube made of magnetic isolation material, the permanent magnet (531) is cylindrical, and the magnetization direction of the permanent magnet (531) is axial magnetization; the magnetic pole of the electromagnet (52) can be adjusted.

9. A flywheel energy storage rotor heat dissipation system according to claim 2, characterized in that: Two circles of liquid holes (511) are respectively formed at both ends of the conduit (51), the distance between the two circles of liquid holes (511) is greater than the thickness of the permanent magnet (531), one circle of the liquid holes is close to the electromagnet (52), so as to ensure that the coolant can smoothly enter and exit the conduit (51), and the slider (53) also includes a sealing ring (532) connected to the outer wall of the permanent magnet (531), and the sealing ring (532) is close to the inner wall of the conduit (51).

10. A flywheel energy storage rotor heat dissipation method, characterized in that: By adopting the heat dissipation system described in any one of claims 1 to 9, the coolant enters the conduit (51) from the liquid storage chamber (42), and then as the slider (53) moves upward, it is sprayed from the liquid hole (511) at the top of the conduit (51) to the inner wall of the shaft core hole (111), flows downward into the liquid storage tank (41), and diffuses along the tortuous liquid path, and finally flows into the liquid storage chamber (42) through the return liquid channel (44).

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