Low-temperature rotary sealing joint of superconducting motor rotor

Abstract

The invention discloses a superconducting motor rotor low-temperature rotary sealing joint, and relates to the technical field of rotary sealing joints, the superconducting motor rotor low-temperature rotary sealing joint comprises a rotor hollow shaft, one end of the rotor hollow shaft is fixedly connected with a superconducting phase modifier rotor, and the rotor hollow shaft is fixedly connected with an internal air inlet pipe and an internal air outlet pipe; and the internal gas inlet pipe and the internal gas outlet pipe are used for leading in and leading out cooling gas. The rotor hollow shaft is clamped and wrapped in the bottom sleeve and the top sleeve, the rotor hollow shaft can rotate along the inner sides of the bottom sleeve and the top sleeve without being affected, and when the rotor hollow shaft, the internal air inlet pipe and the internal air outlet pipe rotate together, the internal air inlet pipe rotates along the air inlet communicating annular groove and communicates with the air inlet communicating annular groove; and the internal air outlet pipe rotates along the air outlet communication annular groove and is communicated, so that the rotor hollow shaft rotates, introduction and export of cooling air are not influenced, and the sealing performance of the rotor hollow shaft is also ensured.

Description

Technical Field

[0001] The invention relates to the technical field of rotary sealing joints, and in particular to a low-temperature rotary sealing joint for a superconducting motor rotor. Background Art

[0002] The operating mechanism of the superconducting synchronous condenser is similar to that of the traditional synchronous condenser in structure, both of which include key components such as stator, rotor, slip ring, cooling system and excitation system. The difference is that the superconducting synchronous condenser replaces the excitation coil in the motor rotor with a superconducting coil from a traditional copper coil, and optimizes the rotor structure.

[0003] During the operation of the superconducting synchronous condenser rotor components, it is impossible to achieve an ideal zero resistance. The superconducting magnet itself will produce eddy current losses and generate heat under AC conditions. Or due to incomplete insulation details, heat leakage and heat conduction will occur, which will cause the overall temperature of the rotor to rise. Therefore, a special low-temperature thermal management system is added to meet the low-temperature working requirements of the superconducting coil.

[0004] The current low-temperature thermal management system often uses a pipeline to introduce cold helium into the rotor through the rotor hollow shaft, and exchanges heat with the superconducting coil part. The cold helium after heat exchange is guided out of the rotor hollow shaft through the pipeline for recycling. The connection between the cold helium inlet and outlet pipelines inside the rotor hollow shaft and the external pipeline needs to meet the following conditions: ensure the connection between the cold helium inlet and outlet pipelines inside the rotor hollow shaft and the cold helium inlet and outlet pipelines outside, and ensure that the cold helium inlet and outlet pipelines outside the rotor hollow shaft rotate with the rotor hollow shaft without entanglement, and the inside of the rotor hollow shaft needs to maintain a vacuum state.

[0005] Since the inside of the rotor hollow shaft needs to maintain a vacuum state, the connection structure between the cold helium inlet and outlet pipes inside the rotor hollow shaft and the external pipe and the rotor hollow shaft is prone to poor sealing, which may cause leakage of cold helium during transmission or the vacuum state inside the rotor hollow shaft may be broken. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a superconducting motor rotor low-temperature rotating sealing joint, in which a bottom sleeve and a top sleeve clamp and cover the hollow shaft of the rotor, and the hollow shaft of the rotor can rotate along the inner side of the bottom sleeve and the top sleeve without being affected. When the hollow shaft of the rotor and the internal air inlet pipe and the internal air outlet pipe rotate together, the internal air inlet pipe rotates and connects along the air inlet connecting annular groove, and the internal air outlet pipe rotates and connects along the air outlet connecting annular groove, thereby realizing the rotation of the hollow shaft of the rotor while ensuring that the introduction and outlet of the cooling gas are not affected and also ensuring its sealing.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme:

[0008] A superconducting motor rotor low-temperature rotary sealing joint comprises a rotor hollow shaft, one end of which is fixedly connected to a superconducting phase shifter rotor, an internal air inlet pipe and an internal air outlet pipe are fixedly connected to the rotor hollow shaft, and the internal air inlet pipe and the internal air outlet pipe are used for introducing and exporting cooling gas;

[0009] It also includes a bottom sleeve and a top sleeve, wherein the bottom sleeve and the top sleeve clamp and cover the hollow rotor shaft, and the inner sides of the bottom sleeve and the top sleeve are symmetrically provided with an air inlet communication annular groove and an air outlet communication annular groove, and one end of the internal air inlet pipe extending to the outside of the hollow rotor shaft is movably connected to the inner wall of the air inlet communication annular groove, and one end of the internal air outlet pipe extending to the outside of the hollow rotor shaft is movably connected to the inner wall of the air outlet communication annular groove;

[0010] The inner wall of the air inlet communicating annular groove is fixedly connected with an external air inlet pipe, and the inner wall of the air outlet communicating annular groove is fixedly connected with an external air outlet pipe. One end of the external air inlet pipe and the external air outlet pipe both penetrate the top sleeve and extend to the outside of the top sleeve.

[0011] Preferably, a lifting bracket is fixedly connected to the lower surface of the bottom sleeve, ear plates are fixedly connected on both sides of the bottom sleeve and the top sleeve, a fixing screw is fixedly connected to the ear plate at the bottom, and a fixing nut is threadedly connected to the outer surface of one end of the fixing screw that passes through the top ear plate.

[0012] Preferably, a buffer sleeve is fixedly connected to the outer surface of the hollow rotor shaft, and the outer surface of the buffer sleeve is movably connected to the inner sides of the bottom sleeve and the top sleeve.

[0013] Preferably, two sealing grooves are symmetrically provided on the inner sides of the bottom sleeve and the top sleeve, a sealing ring is movably connected to the inner wall of each sealing groove, and two installation grooves are provided on the outer surface of the buffer sleeve, and the sealing grooves are clamped with the installation grooves.

[0014] Preferably, two pneumatic sealing grooves are symmetrically provided on the inner sides of the bottom sleeve and the top sleeve, a pneumatic sealing ring is fixedly connected to the inner wall of the pneumatic sealing groove provided on the inner side of the top sleeve, the inner wall of the pneumatic sealing groove provided on the inner side of the bottom sleeve is movably connected to the pneumatic sealing ring, and an inflation mechanism is provided between the bottom sleeve and the top sleeve.

[0015] Preferably, the inflation mechanism includes two push plates fixedly connected to the inner side of the bottom sleeve, hydraulic chambers are opened inside the two ends of the top sleeve, and a piston plate is movably connected to the inner wall of the hydraulic chamber. The hydraulic chamber is connected to the pneumatic sealing ring through a connecting groove. After the bottom sleeve and the top sleeve are spliced ​​and installed, the push plate extends into the interior of the hydraulic chamber to push the piston plate to slide along the inner wall of the hydraulic chamber, squeezing the gas inside the hydraulic chamber into the pneumatic sealing ring, causing the pneumatic sealing ring to inflate and fill the space in the pneumatic sealing groove.

[0016] Preferably, an annular heat dissipation groove is transversely opened on the inner wall of the air intake connecting annular groove toward one side of the air outlet connecting annular groove, and the annular heat dissipation groove is connected with the air intake connecting annular groove.

[0017] Preferably, a plurality of springs and elastic balls are fixedly connected to the interior of the buffer sleeve, and the plurality of springs and elastic balls are evenly and staggeredly distributed inside the buffer sleeve.

[0018] Preferably, both ends of the top sleeve are fixedly connected with sealing gaskets.

[0019] Beneficial effects:

[0020] 1. The bottom sleeve and the top sleeve of the present invention clamp and cover the hollow rotor shaft, and the hollow rotor shaft can rotate along the inner side of the bottom sleeve and the top sleeve without being affected. When the hollow rotor shaft and the internal air inlet pipe and the internal air outlet pipe rotate together, the internal air inlet pipe rotates and communicates along the air inlet communicating annular groove, and the internal air outlet pipe rotates and communicates along the air outlet communicating annular groove, thereby realizing the rotation of the hollow rotor shaft while ensuring that the introduction and outlet of the cooling gas are not affected and also ensuring its sealing.

[0021] 2. After the bottom sleeve and the top sleeve of the present invention are spliced ​​and installed, the push plate extends to the inside of the hydraulic cavity to push the piston plate to slide along the inner wall of the hydraulic cavity, squeezing the gas inside the hydraulic cavity into the pneumatic sealing ring, causing the pneumatic sealing ring to inflate and fill the space of the pneumatic sealing groove. When the bottom sleeve and the top sleeve are installed oppositely, the two push plates on the bottom sleeve will be aligned with the piston plate on the top sleeve. When the bottom sleeve and the top sleeve are gradually spliced, the push plate pushes the piston plate to slide along the hydraulic cavity, pressing the gas in the hydraulic cavity into the pneumatic sealing ring through the connecting groove, causing the pneumatic sealing ring to inflate and fill the space to form a sealing ring, thereby improving the overall sealing performance.

[0022] 3. In the present invention, when the cooling gas flows into the air intake connecting annular groove through the external air intake pipe, it will horizontally cover the space of the annular heat dissipation groove, thereby processing the heat generated by the rotational friction at the shaft connection and avoiding the problem of the structure expanding due to heat affecting the sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a superconducting motor rotor low-temperature rotary sealing joint of the present invention;

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the bottom sleeve and the hollow rotor shaft of the present invention;

[0025] Figure 3 It is a schematic diagram of the inner structure of the bottom cover of the present invention;

[0026] Figure 4 It is a schematic diagram of the inner structure of the top cover of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the sealing ring of the present invention installed on the buffer sleeve;

[0028] Figure 6 It is a schematic diagram of the structure after the sealing ring and the buffer sleeve of the present invention are separated;

[0029] Figure 7 It is a structural schematic diagram of the inflation mechanism of the present invention;

[0030] Figure 8 It is a schematic diagram of the internal structure of the buffer sleeve of the present invention;

[0031] Fig. 9 For the present invention Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0032] In the figure: 1. lifting bracket; 2. bottom sleeve; 3. top sleeve; 4. hollow rotor shaft; 5. buffer sleeve; 6. internal air inlet pipe; 7. internal air outlet pipe; 8. ear plate; 9. fixing screw; 10. fixing nut; 11. external air inlet pipe; 12. external air outlet pipe; 13. air inlet connecting annular groove; 14. annular heat dissipation groove; 15. air outlet connecting annular groove; 16. sealing card groove; 17. sealing ring; 18. mounting groove; 19. pneumatic sealing groove; 20. pneumatic sealing ring; 21. sealing gasket; 22. push plate; 23. hydraulic chamber; 24. piston plate; 25. connecting groove; 26. spring; 27. elastic ball. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of 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. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Embodiment 1:

[0035] like Figure 1-Figure 9 As shown, the present invention provides a superconducting motor rotor low-temperature rotary sealing joint, including a rotor hollow shaft 4, one end of which is fixedly connected to the superconducting phase shifter rotor, and an internal air inlet pipe 6 and an internal air outlet pipe 7 are fixedly connected to the rotor hollow shaft 4, and the internal air inlet pipe 6 and the internal air outlet pipe 7 are used for introducing and exporting cooling gas. In the present invention, the cooling gas adopts cold helium, and other gases can also be used to maintain the low-temperature operating environment of the superconducting phase shifter rotor.

[0036] The present invention also includes a bottom sleeve 2 and a top sleeve 3, the bottom sleeve 2 and the top sleeve 3 clamp and cover the rotor hollow shaft 4, the rotor hollow shaft 4 can rotate along the inner side of the bottom sleeve 2 and the top sleeve 3 without being affected, the inner sides of the bottom sleeve 2 and the top sleeve 3 are symmetrically provided with an air intake communicating annular groove 13 and an air outlet communicating annular groove 15, one end of the internal air intake pipe 6 extends to the outside of the rotor hollow shaft 4 and is movably connected to the inner wall of the air intake communicating annular groove 13, and one end of the internal air outlet pipe 7 extends to the outside of the rotor hollow shaft 4 and is movably connected to the inner wall of the air outlet communicating annular groove 15, when the rotor hollow shaft 4 and the internal air intake pipe 6 and the internal air outlet pipe 7 rotate together, the internal air intake pipe 6 rotates and is connected along the air intake communicating annular groove 13, and the internal air outlet pipe 7 rotates and is connected along the air outlet communicating annular groove 15.

[0037] The inner wall of the air intake connecting annular groove 13 is fixedly connected with an external air intake pipe 11, and the inner wall of the air outlet connecting annular groove 15 is fixedly connected with an external air outlet pipe 12. One end of the external air intake pipe 11 and the external air outlet pipe 12 both pass through the top sleeve 3 and extend to the outside of the top sleeve 3.

[0038] The cooling gas is introduced into the cavity of the air intake communicating annular groove 13 through the external air intake pipe 11. The internal air intake pipe 6 connected to the air intake communicating annular groove 13 can introduce the cooling gas into the rotor superconducting coil part to perform heat dissipation treatment on it. The cooling gas after the heat exchange treatment flows back to the air outlet communicating annular groove 15 through the internal air outlet pipe 7, and is guided to the outside through the external air outlet pipe 12. After the temperature is reduced, it is recycled and reused, thereby ensuring the vacuum state inside the rotor hollow shaft while ensuring that the inlet and outlet of the cooling gas are not affected, avoiding the problem of leakage of the cooling gas.

[0039] Furthermore, a lifting bracket 1 is fixedly connected to the lower surface of the bottom sleeve 2, and ear plates 8 are fixedly connected to both sides of the bottom sleeve 2 and the top sleeve 3. A fixing screw 9 is fixedly connected to the ear plate 8 at the bottom, and a fixing nut 10 is threadedly connected to the outer surface of one end of the fixing screw 9 that passes through the top ear plate 8. The bottom sleeve 2 and the top sleeve 3 are fixed by the ear plate 8, the fixing screw 9 and the fixing nut 10, and the lifting bracket 1 is an adjustable lifting mechanism in the prior art. Through the arrangement of the above structure, it is convenient to quickly remove the bottom sleeve 2 and the top sleeve 3, and to maintain or replace the sealing structure between the bottom sleeve 2, the top sleeve 3 and the hollow rotor shaft 4 to ensure its sealing performance.

[0040] Furthermore, a buffer sleeve 5 is fixedly connected to the outer surface of the rotor hollow shaft 4, and the outer surface of the buffer sleeve 5 is movably connected to the inner side of the bottom sleeve 2 and the top sleeve 3. The buffer sleeve 5 is made of a material that can undergo elastic deformation. The buffer sleeve 5 is in a state of being squeezed and elastically deformed during installation. When the rotor hollow shaft 4 undergoes non-axial movement, different degrees of squeezing will be generated on the buffer sleeve 5, thereby causing a certain degree of elastic deformation of the buffer sleeve 5. Through the deformation of the buffer sleeve 5, the buffer sleeve 5 and the bottom sleeve 2 and the top sleeve 3 can always maintain a relatively close abutment state to ensure sealing.

[0041] Furthermore, two sealing grooves 16 are symmetrically provided on the inner sides of the bottom sleeve 2 and the top sleeve 3, and a sealing ring 17 is movably connected to the inner wall of each sealing groove 16. Two mounting grooves 18 are provided on the outer surface of the buffer sleeve 5, and the sealing grooves 16 are snap-connected with the mounting grooves 18. The sealing ring 17 is a sealing structure commonly used in the prior art. When the bottom sleeve 2 and the top sleeve 3 are connected and the rotor hollow shaft 4 is wrapped inside, a sealing ring is formed by the sealing ring 17 to improve the sealing performance.

[0042] Furthermore, two pneumatic sealing grooves 19 are symmetrically provided on the inner sides of the bottom sleeve 2 and the top sleeve 3, and a pneumatic sealing ring 20 is fixedly connected to the inner wall of the pneumatic sealing groove 19 provided on the inner side of the top sleeve 3, and the inner wall of the pneumatic sealing groove 19 provided on the inner side of the bottom sleeve 2 is movably connected to the pneumatic sealing ring 20, and an inflation mechanism is provided between the bottom sleeve 2 and the top sleeve 3. After the bottom sleeve 2 and the top sleeve 3 are installed, the pneumatic sealing ring 20 is snap-fitted with the pneumatic sealing groove 19 provided on the bottom sleeve 2, and at the same time, the inflation mechanism produces an inflation effect on the pneumatic sealing ring 20, so that the pneumatic sealing ring 20 expands, fills the gap at the pneumatic sealing groove 19, and improves the sealing performance.

[0043] Furthermore, the inflation mechanism includes two push plates 22 fixedly connected to the inner side of the bottom sleeve 2, hydraulic chambers 23 are provided inside the two ends of the top sleeve 3, piston plates 24 are movably connected to the inner wall of the hydraulic chamber 23, and the hydraulic chamber 23 is connected to the pneumatic sealing ring 20 through a connecting groove 25. After the bottom sleeve 2 and the top sleeve 3 are spliced ​​and installed, the push plates 22 extend to the inside of the hydraulic chamber 23 to push the piston plates 24 to slide along the inner wall of the hydraulic chamber 23, and squeeze the gas inside the hydraulic chamber 23 into the pneumatic sealing ring 20. The pneumatic sealing ring 20 is inflated to fill the space of the pneumatic sealing groove 19. When the bottom sleeve 2 and the top sleeve 3 are installed opposite to each other, the two push plates 22 on the bottom sleeve 2 will be aligned with the piston plate 24 on the top sleeve 3. When the bottom sleeve 2 and the top sleeve 3 are gradually spliced ​​together, the push plates 22 push the piston plate 24 to slide along the hydraulic cavity 23, and the gas in the hydraulic cavity 23 is pressed into the pneumatic sealing ring 20 through the connecting groove 25, so that the pneumatic sealing ring 20 is inflated to fill the space, forming a sealing ring, and improving the overall sealing performance.

[0044] Furthermore, an annular heat dissipation groove 14 is horizontally opened on the inner wall of the air intake connecting annular groove 13 toward the side of the air outlet connecting annular groove 15, and the annular heat dissipation groove 14 is connected with the air intake connecting annular groove 13. When the cooling gas flows into the air intake connecting annular groove 13 through the external air intake pipe 11, it will horizontally cover the space of the annular heat dissipation groove 14, thereby processing the heat generated by the rotational friction at the shaft connection, avoiding the problem of the structure expanding due to heat affecting the sealing.

[0045] Furthermore, a plurality of springs 26 and elastic balls 27 are fixedly connected to the interior of the buffer sleeve 5. The plurality of springs 26 and elastic balls 27 are evenly and staggeredly distributed inside the buffer sleeve 5. The springs 26 and elastic balls 27 have certain elastic properties, so that when the buffer sleeve 5 is squeezed and elastically deformed, it has strong elastic buffering performance.

[0046] Furthermore, sealing gaskets 21 are fixedly connected to both ends of the top sleeve 3 to improve the sealing performance of the connection between the bottom sleeve 2 and the top sleeve 3 .

[0047] The working principle of the superconducting motor rotor low-temperature rotating sealing joint is explained in detail.

[0048] like Figure 1-Figure 9 As shown, first adjust the lifting bracket 1 so that the bottom sleeve 2 is tightly abutted against the outer part of the rotor hollow shaft 4 and the buffer sleeve 5, and then fix the position of the top sleeve 3 and the bottom sleeve 2 by means of the ear plate 8, the fixing screw 9 and the fixing nut 10. In this process, the sealing ring 17 is tightly clamped with the sealing groove 16 to form a first layer of sealing structure. At the same time, the push plate 22 pushes the piston plate 24 to slide along the hydraulic chamber 23, and presses the gas in the hydraulic chamber 23 into the pneumatic sealing ring 20 through the connecting groove 25, so that the pneumatic sealing ring 20 is inflated and expanded to fill the space at the pneumatic sealing groove 19, forming a second layer of sealing structure. The sealing performance of the overall structure is improved by setting a multi-layer sealing structure.

Claims

1. A superconducting motor rotor low temperature rotary sealing joint, characterized in that: It comprises a rotor hollow shaft (4), one end of the rotor hollow shaft (4) is fixedly connected to the superconducting phase shifter rotor, an internal air inlet pipe (6) and an internal air outlet pipe (7) are fixedly connected to the rotor hollow shaft (4), and the internal air inlet pipe (6) and the internal air outlet pipe (7) are used for introducing and exporting cooling gas; It also includes a bottom sleeve (2) and a top sleeve (3), wherein the bottom sleeve (2) and the top sleeve (3) clamp and cover the rotor hollow shaft (4), and the inner sides of the bottom sleeve (2) and the top sleeve (3) are symmetrically provided with an air intake communication annular groove (13) and an air outlet communication annular groove (15), and one end of the internal air intake pipe (6) extending to the outside of the rotor hollow shaft (4) is movably connected to the inner wall of the air intake communication annular groove (13), and one end of the internal air outlet pipe (7) extending to the outside of the rotor hollow shaft (4) is movably connected to the inner wall of the air outlet communication annular groove (15); The inner wall of the air intake communicating annular groove (13) is fixedly connected to an external air intake pipe (11), and the inner wall of the air outlet communicating annular groove (15) is fixedly connected to an external air outlet pipe (12), and one end of each of the external air intake pipe (11) and the external air outlet pipe (12) passes through the top sleeve (3) and extends to the outside of the top sleeve (3).

2. A superconducting motor rotor low temperature rotary sealing joint according to claim 1, characterized in that: The lower surface of the bottom sleeve (2) is fixedly connected to a lifting bracket (1), and both sides of the bottom sleeve (2) and the top sleeve (3) are fixedly connected to ear plates (8), and a fixing screw (9) is fixedly connected to the ear plate (8) at the bottom, and a fixing nut (10) is threadedly connected to the outer surface of one end of the fixing screw (9) that passes through the ear plate (8) at the top.

3. A superconducting motor rotor low temperature rotary sealing joint according to claim 1, characterized in that: A buffer sleeve (5) is fixedly connected to the outer surface of the rotor hollow shaft (4), and the outer surface of the buffer sleeve (5) is movably connected to the inner sides of the bottom sleeve (2) and the top sleeve (3).

4. A superconducting motor rotor low temperature rotary sealing joint according to claim 1, characterized in that: Two sealing grooves (16) are symmetrically formed on the inner sides of the bottom sleeve (2) and the top sleeve (3), and a sealing ring (17) is movably connected to the inner wall of each sealing groove (16). Two mounting grooves (18) are formed on the outer surface of the buffer sleeve (5), and the sealing grooves (16) are snap-connected to the mounting grooves (18).

5. A superconducting motor rotor low temperature rotary sealing joint according to claim 1, characterized in that: Two pneumatic sealing grooves (19) are symmetrically provided on the inner sides of the bottom sleeve (2) and the top sleeve (3); a pneumatic sealing ring (20) is fixedly connected to the inner wall of the pneumatic sealing groove (19) provided on the inner side of the top sleeve (3); the inner wall of the pneumatic sealing groove (19) provided on the inner side of the bottom sleeve (2) is movably connected to the pneumatic sealing ring (20); and an inflation mechanism is provided between the bottom sleeve (2) and the top sleeve (3).

6. A superconducting motor rotor low temperature rotary sealing joint according to claim 5, characterized in that: The inflation mechanism comprises two push plates (22) fixedly connected to the inner side of the bottom sleeve (2), hydraulic chambers (23) are provided at both ends of the top sleeve (3), a piston plate (24) is movably connected to the inner wall of the hydraulic chamber (23), and the hydraulic chamber (23) is communicated with the pneumatic sealing ring (20) via a communicating groove (25). After the bottom sleeve (2) and the top sleeve (3) are spliced ​​and installed, the push plates (22) extend into the hydraulic chamber (23) to push the piston plate (24) to slide along the inner wall of the hydraulic chamber (23), thereby squeezing the gas inside the hydraulic chamber (23) into the pneumatic sealing ring (20), causing the pneumatic sealing ring (20) to expand and fill the space of the pneumatic sealing groove (19).

7. A superconducting motor rotor low temperature rotary sealing joint according to claim 1, characterized in that: An annular heat dissipation groove (14) is transversely provided on the inner wall of the air intake communicating annular groove (13) towards one side of the air outlet communicating annular groove (15), and the annular heat dissipation groove (14) is communicated with the air intake communicating annular groove (13).

8. The superconducting motor rotor low temperature rotary sealing joint according to claim 3, characterized in that: A plurality of springs (26) and elastic balls (27) are fixedly connected to the interior of the buffer sleeve (5); the plurality of springs (26) and elastic balls (27) are evenly and staggeredly distributed inside the buffer sleeve (5).

9. A superconducting motor rotor low temperature rotary sealing joint according to claim 1, characterized in that: Both ends of the top sleeve (3) are fixedly connected with sealing gaskets (21).

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