A flywheel energy storage and heat dissipation system

Abstract

The present invention relates to a flywheel energy storage and heat dissipation system. It comprises an upper shell, a lower shell and a water cooler; the upper shell and the lower shell are connected in abutment; a flywheel body, a flywheel shaft, an upper radial magnetic bearing, a lower radial magnetic bearing and a motor are installed in the cavity formed by the upper shell and the lower shell; the flywheel body is installed on the flywheel shaft, and the upper and lower ends of the flywheel shaft are respectively installed with an upper radial magnetic bearing and a lower radial magnetic bearing; a spiral upper cooling water channel is installed in the upper shell, and the upper cooling water channel extends in the upper shell; a spiral lower cooling water channel is installed in the lower shell, and the lower cooling water channel extends in the lower shell; the water cooler provides coolant for the upper cooling water channel and the lower cooling water channel. As the upper cooling water channel extends in the upper shell and the lower cooling water channel extends in the lower shell, the upper cooling water channel and the lower cooling water channel can dissipate heat to the upper radial magnetic bearing, the flywheel body, the lower radial magnetic bearing and the motor. The heat dissipation range of the present invention is wide and the heat dissipation effect is good.

Description

Technical Field

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

[0002] Flywheel energy storage has been around since the mid-20th century, boasting over 50 years of research, development, and application. Flywheel energy storage stores energy in a high-speed rotating flywheel rotor, enabling bidirectional conversion of electrical energy into kinetic energy. Flywheel energy storage technology is currently primarily used in engineering applications such as uninterruptible power supplies, power quality regulation, energy recovery and regeneration, and distributed energy power smoothing.

[0003] Flywheel energy storage motors and converters have power ratings ranging from 100 to 3000kW. This lost electrical energy is typically converted into heat. Furthermore, although the flywheel rotor is in a vacuum, friction with the minimal amount of air still generates heat at high speeds. To dissipate the heat generated by the flywheel energy storage device during long-term operation and prevent malfunction, heat dissipation is required.

[0004] Currently, the commonly used heat dissipation method only dissipates heat from the flywheel shaft and flywheel body. The main method for dissipating heat from the flywheel shaft is to use a hollow structure for the system rotor, with the heat dissipation pipe arranged in the central shaft hole of the rotor without mechanical contact with the inner wall of the shaft. The heat from the rotor is transferred to the heat dissipation pipe by thermal radiation. The main method for dissipating heat from the flywheel body is to divide the flywheel body into two along the axial direction, and arrange a heat dissipation plate in the gap between the upper and lower flywheels. The heat dissipation plate does not contact the flywheel body, and the heat from the flywheel is transferred to the heat dissipation plate by thermal radiation.

[0005] There are two problems with the above method: on the one hand, during the operation of the flywheel, the magnetic bearings and the motor stator will also generate a certain amount of heat, which will lead to reduced equipment reliability or even failure during long-term operation; on the other hand, the hollow structure of the rotor is difficult to manufacture and requires high structural precision, and the heat sink is too limited to the heat dissipation area of ​​the flywheel.

[0006] In summary, the existing heat dissipation of the flywheel energy storage device is relatively local, and the heat dissipation effect cannot meet the requirements. Summary of the Invention

[0007] The object of the present invention is to provide a flywheel energy storage and heat dissipation system, which has a wider heat dissipation range and better heat dissipation effect.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] A flywheel energy storage and heat dissipation system comprises an upper shell, a lower shell and a water cooler; the upper shell and the lower shell are abutted and connected; a flywheel body, a flywheel shaft, an upper radial magnetic bearing, a lower radial magnetic bearing and a motor are installed in a cavity formed by the upper shell and the lower shell; the flywheel body is installed on the flywheel shaft, and the upper and lower ends of the flywheel shaft are respectively installed with the upper radial magnetic bearing and the lower radial magnetic bearing; a spiral upper cooling water channel is installed in the upper shell, and the upper cooling water channel extends in the upper shell; a spiral lower cooling water channel is installed in the lower shell, and the lower cooling water channel extends in the lower shell; the water cooler provides coolant for the upper cooling water channel and the lower cooling water channel.

[0010] Preferably, the upper cooling water channel extends from above the upper radial magnetic bearing to the bottom of the flywheel body; the lower cooling water channel extends from the bottom end of the flywheel body to below the lower radial magnetic bearing and the motor.

[0011] Preferably, the top surface of the flywheel body also has a top groove, and the bottom surface of the flywheel body is also provided with a bottom groove; the upper shell has an upper shell insertion section, and the upper shell insertion section is inserted into the top groove; the lower shell has a lower shell insertion section, and the lower shell insertion section is inserted into the bottom groove; part of the upper cooling water channel extends into the upper shell insertion section, and part of the lower cooling water channel extends into the lower shell insertion section.

[0012] Preferably, the upper shell insertion section and the lower shell insertion section are for the flywheel shaft to pass through, and the gaps between them and the flywheel shaft are d respectively, and the gaps between the upper radial magnetic bearing and the lower radial magnetic bearing and the flywheel shaft are b respectively, and d is smaller than b.

[0013] Preferably, an upper cooling water channel is installed in the upper shell; and a lower cooling water channel is installed in the lower shell.

[0014] Preferably, the upper and lower outer ends of the flywheel shaft are respectively installed with an upper mechanical protection bearing and a lower mechanical protection bearing, the gaps between the upper and lower mechanical protection bearings and the flywheel shaft are respectively a, and the gaps between the upper and lower radial magnetic bearings and the flywheel shaft are respectively b, and a is smaller than b.

[0015] Preferably, the gap between the rotor and the stator of the motor is c, and c is greater than a.

[0016] Preferably, the motor is arranged below the lower radial magnetic bearing.

[0017] Preferably, two parallel upper cooling water channels are formed in the upper shell insertion section, and two parallel lower cooling water channels are formed in the lower shell insertion section.

[0018] Preferably, the flywheel energy storage and heat dissipation system further includes an upper mechanical protection bearing, an axial magnetic bearing, and a lower mechanical protection bearing. The upper mechanical protection bearing, the axial magnetic bearing, the upper radial magnetic bearing, the flywheel body, the lower radial magnetic bearing, the motor, and the lower mechanical protection bearing are distributed in sequence from top to bottom.

[0019] The flywheel energy storage and heat dissipation system of the present invention has the beneficial effect of dissipating heat from the upper radial magnetic bearing, the flywheel body, the lower radial magnetic bearing, and the motor by disposing a spiral upper cooling water channel in the upper housing and a spiral lower cooling water channel in the lower housing. As the upper cooling water channel extends within the upper housing and the lower cooling water channel extends within the lower housing, the upper cooling water channel and the lower cooling water channel can dissipate heat from the upper radial magnetic bearing, the flywheel body, the lower radial magnetic bearing, and the motor. The flywheel energy storage and heat dissipation system of the present invention has a wide heat dissipation range and good heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall structural diagram of a flywheel energy storage and heat dissipation system according to an embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of an upper housing according to an embodiment of the present invention;

[0022] Figure 3 This is a half-section view of the cooling water channel in an embodiment of the present invention;

[0023] Figure 4 is a cross-sectional view of the lower housing of an embodiment of the present invention;

[0024] Figure 5 This is a half-section view of a cooling water channel according to an embodiment of the present invention;

[0025] Figure 6 It is a cross-sectional view of a flywheel body according to an embodiment of the present invention.

[0026] The names and numbers of the components in the figure are as follows:

[0027] Flywheel energy storage and heat dissipation system (100), center line (101);

[0028] An upper shell (10), an upper shell small diameter section (11), an upper shell large diameter section (12), an upper shell insertion section (13), an upper shell small cavity (14), an upper shell large cavity (15), and a sealing plate (16);

[0029] A lower shell (20), a mating portion (21), a lower shell small diameter section (22), a lower shell insertion section (23), and a lower shell small cavity (24);

[0030] Upper cooling water channel (30);

[0031] Lower cooling water channel (40);

[0032] Flywheel body (51), shaft hole (511), top groove (512), bottom groove (513), flywheel shaft (52);

[0033] Motor (60);

[0034] An upper radial magnetic bearing (71), a lower radial magnetic bearing (72), an axial magnetic bearing (73), an upper mechanical protection bearing (74), and a lower mechanical protection bearing (75);

[0035] Water cooling machine (80). DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0037] like Figure 1 As shown, this embodiment discloses a flywheel energy storage and heat dissipation system 100. The flywheel energy storage and heat dissipation system 100 includes an upper shell 10 and a lower shell 20. The upper shell 10 and the lower shell 20 are connected in abutment with each other.

[0038] The flywheel body 51, flywheel shaft 52, upper radial magnetic bearing 71, lower radial magnetic bearing 72, axial magnetic bearing 73, upper mechanical protection bearing 74, lower mechanical protection bearing 75, and motor 60 are mounted in the cavity formed by the upper shell 10 and the lower shell 20. The centerline of the flywheel shaft 52 is aligned with the centerline 101 of the upper shell 10 and the lower shell 20.

[0039] The upper mechanical protection bearing 74, the axial magnetic bearing 73, the upper radial magnetic bearing 71, the lower radial magnetic bearing 72, the motor 60, and the lower mechanical protection bearing 75 are arranged in the cavity formed by the upper shell 10 and the lower shell 20, and are distributed in order from top to bottom.

[0040] The flywheel body 51 is mounted on the flywheel shaft 52 and rotates as the flywheel shaft 52 rotates. An upper radial magnetic bearing 71 and a lower radial magnetic bearing 72 are mounted on the upper and lower ends of the flywheel shaft 52, respectively. These bearings 71 and 72 exert magnetic force. These bearings apply radial force to the flywheel shaft 52 to ensure smooth rotation.

[0041] An upper mechanical protection bearing 74 and a lower mechanical protection bearing 75 are mounted on the upper and lower outer ends of the flywheel shaft 52, respectively. The clearances a between the upper and lower mechanical protection bearings 74 and 75 and the flywheel shaft 52 are respectively defined as 'a'. The clearances b between the upper and lower radial magnetic bearings 71 and 72 and the flywheel shaft 52 are respectively defined as 'b'. Gap a is smaller than gap b.

[0042] When the flywheel energy storage and heat dissipation system 100 is operating normally and smoothly, the upper mechanical protection bearing 74 and the lower mechanical protection bearing 75 are not in operation. The upper mechanical protection bearing 74 and the lower mechanical protection bearing 75 of this embodiment function to prevent excessive radial vibration of the flywheel body 51 and the flywheel shaft 52, and to prevent the flywheel shaft 52 from colliding with the upper radial magnetic bearing 71 and the lower radial magnetic bearing 72, thereby causing damage.

[0043] An axial magnetic bearing 73 is also mounted on the flywheel shaft 52 between the upper mechanical protection bearing 74 and the upper radial magnetic bearing 71. The axial magnetic bearing 73 comprises a circular disc oriented perpendicularly to the axial direction. This disc provides load-bearing support for the flywheel shaft 52, and in turn, for the flywheel body 51 and flywheel shaft 52 as a whole, ensuring the upward suspension of the flywheel shaft 52.

[0044] In this embodiment, the shell of the flywheel energy storage and heat dissipation system 100 is divided into two parts, namely an upper shell 10 and a lower shell 20. The upper cooling water channel 30 is installed in the upper shell 10, and the lower cooling water channel 40 is installed in the lower shell 20, thereby making the flywheel energy storage and heat dissipation system 100 of this embodiment easier to assemble.

[0045] The upper cooling water channel 30 of this embodiment primarily dissipates heat from the axial magnetic bearing 73, the upper radial magnetic bearing 71, and the flywheel body 51. The upper cooling water channel 30 can also dissipate heat from the flywheel shaft 52. The lower cooling water channel 40 primarily dissipates heat from the flywheel shaft 52, the lower radial magnetic bearing 72, and the motor 60. The lower cooling water channel 40 can also dissipate heat from the flywheel shaft 52. This embodiment provides a wide heat dissipation range for the flywheel energy storage and heat dissipation system 100, achieving excellent heat dissipation performance.

[0046] like Figure 4 and Figure 5 As shown, the upper cooling water channel 30 and the lower cooling water channel 40 of this embodiment are both spiral structures, which are easy to process and conducive to heat exchange. The spiral direction of the upper cooling water channel 30 and the lower cooling water channel 40 includes a vertical spiral part and a horizontal spiral part.

[0047] In this embodiment, the upper radial magnetic bearing 71 and the lower radial magnetic bearing 72 are symmetrically distributed relative to the flywheel body 51. The existing motor 60 is arranged between the flywheel body 51 and the lower radial magnetic bearing 72, because the motor 60 needs to be routed. This structural arrangement will result in the lower cooling water channel 40 being unable to extend a longer length downward. In this embodiment, the motor 60 is arranged below the lower radial magnetic bearing 72, so that the lower cooling water channel 40 can extend a longer length downward, thereby being able to dissipate heat for the lower radial magnetic bearing 72 and the motor 60, and the heat dissipation effect is better.

[0048] The motor 60 of this embodiment can provide driving force for the flywheel shaft 52 when charging, and can convert kinetic energy into electrical energy when discharging. The gap between the rotor and stator of the motor 60 is c. The gap a is smaller than the gap b. The gap b is smaller than the gap c. The gap between the rotor and stator of the motor 60 of this embodiment is larger than the gap between the upper mechanical protection bearing 74 and the lower mechanical protection bearing 75 and the flywheel shaft 52, so that the stator and rotor of the motor 60 will not rub against each other, which is beneficial to protecting the motor 60, improving the safety of the flywheel energy storage and heat dissipation system 100, and extending the service life of the flywheel energy storage and heat dissipation system 100. The lower end of the rotor of the motor 60 is the motor coil winding, and the lower end of the motor coil winding is the lower mechanical protection bearing 75.

[0049] like Figure 6 As shown, the flywheel body 51 has an axial hole 511 for the flywheel shaft 52 to pass through. The top surface of the flywheel body 51 also has a top groove 512, and the bottom surface is also provided with a bottom groove 513. The top groove 512 and the bottom groove 513 are both connected to the axial hole 511 to form an I-shaped structure.

[0050] like Figure 1 and Figure 2 As shown, the upper housing 10 comprises a small-diameter section 11 and a large-diameter section 12. The small-diameter section 11 forms a small cavity 14, while the large-diameter section 12 forms a large cavity 15. The upper housing 10 also comprises an insert section 13 that extends into the large cavity 15. In this embodiment, the small-diameter section 11, the large-diameter section 12, and the insert section 13 are integrally formed. A sealing plate 16 is also mounted on the top end of the small-diameter section 11.

[0051] The upper mechanical protection bearing 74, the axial magnetic bearing 73, and the upper radial magnetic bearing 71 are located in the upper housing small cavity 14. The flywheel body 51 is located in the upper housing large cavity 15. The upper portion of the flywheel shaft 52 extends into the upper housing small cavity 14 through the center hole of the upper housing insertion section 13.

[0052] like Figure 2 and Figure 3As shown, the upper cooling water channel 30 is disposed inside the upper shell 10. Specifically, the upper shell 10 has a certain thickness and is provided with an accommodating cavity therein for accommodating the upper cooling water channel 30. The material of the upper shell 10 in this embodiment can be steel.

[0053] The upper cooling water channel 30 is a water channel, and the water inlet or starting point of the upper cooling water channel 30 is located at the upper part of the small diameter section 11 of the upper shell, which is higher than the upper radial magnetic bearing 71. The upper cooling water channel 30 spirals downward from the starting point to the intersection of the small diameter section 11 of the upper shell and the large diameter section 12 of the upper shell; then spirals toward the centerline 101 at the intersection, then enters the upper shell insertion section 13 downward to the bottom of the upper shell insertion section 13, then spirals away from the centerline 101 in the upper shell insertion section 13, then spirals upward in the upper shell insertion section 13 to the intersection, then spirals away from the centerline 101 to the top of the upper shell large diameter section 12, then spirals downward in the upper shell large diameter section 12 to the bottom of the upper shell large diameter section 12, which is also the water outlet or end point of the upper cooling water channel 30.

[0054] The upper cooling water channel 30 can dissipate heat from a portion of the axial magnetic bearing 73, as well as from the upper radial magnetic bearing 71 and the flywheel body 51. Since the upper shell insert section 13 is inserted into the top groove 512, the portion of the upper cooling water channel 30 within the upper shell insert section 13 can further dissipate heat from the flywheel body 51 and the flywheel shaft 52.

[0055] The flywheel energy storage and heat dissipation system 100 of this embodiment further includes a water chiller 80. The water outlet of the water chiller 80 delivers coolant to the water inlet of the upper cooling water channel 30 via a pipe. The water outlet of the upper cooling water channel 30 is connected to the water inlet of the water chiller 80 via a pipe.

[0056] like Figure 1 、 Figure 4 and Figure 5 As shown, the lower housing 20 has a mating portion 21 that seals the bottom end of the upper housing's large-diameter section 12. A lower housing's small-diameter section 22 is connected below the mating portion 21. The lower housing 20 also has a lower-housing insertion section 23 that extends upward from the mating portion 21. The lower housing insertion section 23 is inserted into the bottom groove 513, and its center hole is for the flywheel shaft 52 to pass through.

[0057] In this embodiment, the engaging portion 21 , the lower shell small diameter section 22 and the lower shell inserting section 23 are integrally formed.

[0058] The lower housing small diameter section 22 forms a lower housing small cavity 24. The lower housing small cavity 24 is equipped with a lower radial magnetic bearing 72, a motor 60, and a lower mechanical protection bearing 75.

[0059] The lower cooling water channel 40 is disposed inside the lower shell 20. Specifically, the lower shell 20 has a certain thickness and has an accommodating cavity therein for accommodating the lower cooling water channel 40. The lower shell 20 may be made of steel.

[0060] The water inlet or starting point of the lower cooling water channel 40 is located on the mating portion 21. The lower cooling water channel 40 spirals from the starting point toward the centerline 101 to the bottom of the lower casing insertion section 23. It then spirals upward within the lower casing insertion section 23 to the top of the lower casing insertion section 23. It then spirals toward the centerline 101 within the lower casing insertion section 23 to the inner wall of the lower casing insertion section 23. It then spirals downward within the lower casing insertion section 23 to the bottom of the lower casing insertion section 23. It then spirals away from the centerline 101 to the top of the lower casing small diameter section 22. It then spirals downward within the lower casing small diameter section 22 to the bottom of the lower casing small diameter section 22. This bottom position is the water outlet or end point of the lower cooling water channel 40. This end point is located below the motor 60.

[0061] The lower cooling water channel 40 of this embodiment can dissipate heat from the lower radial magnetic bearing 72 and the motor 60. It can also dissipate heat from a portion of the lower mechanical protection bearing 75. Because the lower housing insert section 23 is inserted into the bottom groove 513, the lower cooling water channel 40 can further dissipate heat from the flywheel body 51 and the flywheel shaft 52.

[0062] The water outlet of the water chiller 80 delivers coolant to the water inlet of the lower cooling water channel 40 via a pipe. The water outlet of the lower cooling water channel 40 is connected to the water inlet of the water chiller 80 via a pipe. The cooling medium in this embodiment can be water or another coolant. The cooling medium circulates between the water chiller 80 and the upper cooling water channel 30 and the lower cooling water channel 40.

[0063] In this embodiment, the water inlets of the upper cooling water channel 30 and the lower cooling water channel 40 are connected to the water outlet of the same water chiller 80 through pipes. The water outlets of the upper cooling water channel 30 and the lower cooling water channel 40 are connected to the water inlet of the same water chiller 80 through pipes.

[0064] The upper cooling water channel 30 and the lower cooling water channel 40 of this embodiment are respectively one water channel with only one water inlet and one water outlet, which is conducive to simplifying components and facilitating installation.

[0065] In other embodiments, more than two water channels may be installed in the upper shell 10 and the lower shell 20 to achieve the desired heat dissipation effect.

[0066] When the flywheel shaft 52 is too long, relying solely on the upper and lower mechanical protection bearings 74 and 75 at the two outer ends to protect the upper and lower radial magnetic bearings 71 and 72 and the motor 60 is insufficient. The high-speed rotating flywheel body 51 and the middle portion of the flywheel shaft 52 may flex and deform.

[0067] In this embodiment, the upper housing insertion section 13 is inserted into the top groove 512 of the flywheel body 51, and the lower housing insertion section 23 is inserted into the bottom groove 513 of the flywheel body 51. This arrangement can also limit the flywheel shaft 52 and provide a certain damping force to ensure that the flywheel body 51 and the flywheel shaft 52 can stably transition to a critical state without losing stability.

[0068] In this embodiment, the gaps between the upper and lower housing insert sections 13 and 23 and the flywheel shaft 52 are respectively d. The gap d is smaller than the gap b to further protect the upper and lower radial magnetic bearings 71 and 72 .

[0069] When the flywheel body 51 and the flywheel shaft 52 are operating at high speed, they vibrate due to dynamic imbalance. When the vibration is low, the upper radial magnetic bearing 71 and the lower radial magnetic bearing 72 can maintain the stable operation of the flywheel body 51 and the flywheel shaft 52. When the flywheel body 51 and the flywheel shaft 52 are in a critical state, the vibration is too large and they become unstable. At this time, the upper mechanical protection bearing 74, the lower mechanical protection bearing 75, the upper shell insert section 13, and the lower shell insert section 23 bear the radial vibration, keeping the flywheel body 51 and the flywheel shaft 52 running.

[0070] The flywheel energy storage and cooling system 100 operates as follows: The water chiller 80 is turned on to dissipate heat from the flywheel energy storage and cooling system 100. The vacuum pump is turned on to evacuate the inner cavity of the flywheel energy storage and cooling system 100 to reduce air resistance. The axial magnetic bearing 73 is activated to suspend the flywheel body 51 and the flywheel shaft 52. The upper and lower radial magnetic bearings 71 and 72 are activated to center the flywheel shaft 52. The motor 60 is started to operate the flywheel body 51 and the flywheel shaft 52, and the flywheel energy storage and cooling system 100 is in a charging state.

[0071] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A flywheel energy storage and heat dissipation system, characterized in that: The invention comprises an upper shell (10), a lower shell (20) and a water-cooling machine (80); the upper shell (10) and the lower shell (20) are connected in abutment; a flywheel body (51), a flywheel shaft (52), an upper radial magnetic bearing (71), a lower radial magnetic bearing (72) and a motor (60) are installed in the cavity formed by the upper shell (10) and the lower shell (20); the flywheel body (51) is installed on the flywheel shaft (52), and the upper and lower ends of the flywheel shaft (52) are respectively The upper radial magnetic bearing (71) and the lower radial magnetic bearing (72) are installed; a spiral upper cooling water channel (30) is installed in the upper shell (10), and the upper cooling water channel (30) extends in the upper shell (10); a spiral lower cooling water channel (40) is installed in the lower shell (20), and the lower cooling water channel (40) extends in the lower shell (20); the water cooler (80) provides cooling liquid for the upper cooling water channel (30) and the lower cooling water channel (40); The upper cooling water channel (30) extends from above the upper radial magnetic bearing (71) to the bottom of the flywheel body (51); the lower cooling water channel (40) extends from the bottom end of the flywheel body (51) to below the lower radial magnetic bearing (72) and the motor (60); The top surface of the flywheel body (51) also has a top groove (512), and the bottom surface of the flywheel body (51) is also provided with a bottom groove (513); the upper shell (10) has an upper shell insertion section (13), and the upper shell insertion section (13) is inserted into the top groove (512); the lower shell (20) has a lower shell insertion section (23), and the lower shell insertion section (23) is inserted into the bottom groove (513); part of the upper cooling water channel (30) extends into the upper shell insertion section (13), and part of the lower cooling water channel (40) extends into the lower shell insertion section (23).

2. A flywheel energy storage and heat dissipation system according to claim 1, characterized in that: The flywheel shaft (52) is passed through the upper shell insertion section (13) and the lower shell insertion section (23), and the gaps between them and the flywheel shaft (52) are respectively d, and the gaps between the upper radial magnetic bearing (71) and the lower radial magnetic bearing (72) and the flywheel shaft (52) are respectively b, and d is smaller than b.

3. A flywheel energy storage and heat dissipation system according to claim 1, characterized in that: An upper cooling water channel (30) is installed in the upper shell (10); and a lower cooling water channel (40) is installed in the lower shell (20).

4. A flywheel energy storage and heat dissipation system according to claim 1, characterized in that: An upper mechanical protection bearing (74) and a lower mechanical protection bearing (75) are respectively installed at the upper and lower outer ends of the flywheel shaft (52), the gaps between the upper and lower mechanical protection bearings (74) and the flywheel shaft (52) are respectively a, and the gaps between the upper and lower radial magnetic bearings (71) and the flywheel shaft (52) are respectively b, and a is smaller than b.

5. A flywheel energy storage and heat dissipation system according to claim 4, characterized in that: The gap between the rotor and the stator of the motor (60) is c, and c is greater than a.

6. A flywheel energy storage and heat dissipation system according to claim 1, characterized in that: The motor (60) is arranged below the lower radial magnetic bearing (72).

7. The flywheel energy storage and heat dissipation system according to claim 1, characterized in that: Two parallel upper cooling water channels (30) are formed in the upper shell insertion section (13), and two parallel lower cooling water channels (40) are formed in the lower shell insertion section (23).

8. The flywheel energy storage and heat dissipation system according to claim 1, characterized in that: The flywheel energy storage and heat dissipation system further comprises an upper mechanical protection bearing (74), an axial magnetic bearing (73), and a lower mechanical protection bearing (75), wherein the upper mechanical protection bearing (74), the axial magnetic bearing (73), the upper radial magnetic bearing (71), the flywheel body (51), the lower radial magnetic bearing (72), the motor (60), and the lower mechanical protection bearing (75) are sequentially distributed from top to bottom.

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