A heat dissipation bearing and a superconducting motor having the same

Abstract

The present invention relates to a heat dissipation bearing and a superconducting motor having the heat dissipation bearing, wherein the heat dissipation bearing comprises an inner sleeve and an outer sleeve which are concentrically sleeved, wherein a first liquid storage cavity is arranged in the inner sleeve, wherein the first liquid storage cavity is an annular cavity along the inner sleeve, and the first liquid storage cavity is coaxially arranged with the inner sleeve; wherein a second liquid storage cavity is arranged in the outer sleeve, wherein the second liquid storage cavity is an annular cavity along the outer sleeve, and the second liquid storage cavity is coaxially arranged with the outer sleeve; wherein both the first liquid storage cavity and the second liquid storage cavity are connected with a liquid infusion tube, and the first liquid storage cavity and the second liquid storage cavity are filled with cooling liquid through the liquid infusion tube; and the superconducting motor comprises a machine body, wherein a rotor core is arranged in the machine body, and the two ends of the rotor core are respectively installed in the inner sleeves of two heat dissipation bearings. The present invention provides a heat dissipation bearing and a superconducting motor having the heat dissipation bearing, wherein the heat generated by friction is neutralized by the heat dissipation bearing, and the internal temperature of the machine body will not be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting equipment, in particular to a heat dissipation bearing and a superconducting motor with the heat dissipation bearing. Background Art

[0002] A superconducting motor refers to a motor whose excitation winding is made of superconducting materials and is wound with wires that can carry high-density currents under strong magnetic fields. By utilizing the characteristics of superconducting materials that their resistance becomes zero in a low-temperature environment and the characteristics of superconducting tapes that carry large currents, the superconducting excitation coil generates a large magnetomotive force, which in turn generates a strong magnetic field in the air gap and stator winding, completing the electromechanical energy conversion.

[0003] When the superconducting motor is in motion, in order to ensure the normal operation of the rotor, bearings need to be installed at both ends of the rotor, and the bearings need to be located on the front and rear casings of the motor. By limiting the position of the bearings, the position of the rotor is further limited.

[0004] Existing superconducting motors have the following shortcomings: when the motor is running, the built-in rotor of the motor will rotate at high speed. At this time, there will be a certain relative friction between the two ends of the rotor and the bearings, which will generate heat and increase heat leakage loss. Large heat leakage loss will reduce the efficiency of the system and even further affect the operating performance of the built-in superconducting coil of the motor. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problem of heat leakage loss caused by friction between the rotor core and the bearings supporting the rotor core when the rotor core rotates at high speed in the prior art, and to provide a heat dissipation bearing and a superconducting motor with a heat dissipation bearing, which can neutralize the heat generated by friction through the heat dissipation bearing and will not increase the internal temperature of the machine body.

[0006] In order to solve the above technical problems, the present invention provides a heat dissipation bearing, comprising an inner sleeve and an outer sleeve which are concentrically arranged.

[0007] The inner sleeve is provided with a first liquid storage cavity, the first liquid storage cavity is an annular cavity along the inner sleeve, and the first liquid storage cavity is coaxially arranged with the inner sleeve;

[0008] The outer sleeve is provided with a second liquid storage cavity, the second liquid storage cavity is an annular cavity along the outer sleeve, and the second liquid storage cavity is coaxially arranged with the outer sleeve;

[0009] Wherein, the first liquid storage chamber and the second liquid storage chamber are both connected to the infusion tube, and the first liquid storage chamber and the second liquid storage chamber are filled with cooling liquid through the infusion tube.

[0010] In one embodiment of the present invention, a heat dissipation groove coaxial with the inner sleeve is provided on a cross-sectional side wall of the inner sleeve, a heat dissipation ring is provided in the heat dissipation groove, and the first liquid storage cavity is provided in the heat dissipation ring.

[0011] In one embodiment of the present invention, the second liquid storage chamber is directly opened between the inner wall of the outer sleeve and the outer wall of the outer sleeve.

[0012] In one embodiment of the present invention, a plurality of support blocks evenly arranged circumferentially are provided in the second liquid storage cavity, two ends of the support blocks are respectively connected to the inner wall of the outer sleeve and the outer wall of the outer sleeve, and the width of the support blocks is smaller than the width of the second liquid storage cavity.

[0013] In one embodiment of the present invention, the first liquid storage chamber and the second liquid storage chamber are connected to the liquid infusion tube through the first liquid inlet tube and the second liquid inlet tube respectively.

[0014] In one embodiment of the present invention, a ball is further arranged between the inner sleeve and the outer sleeve, an inner ring-shaped groove is provided in the middle of the inner side of the outer sleeve, and an outer ring-shaped groove is provided in the middle of the outer side of the inner sleeve, and the ball is arranged between the inner groove and the outer groove.

[0015] In order to solve the above technical problems, the present invention provides a superconducting motor with a heat dissipation bearing, wherein a rotor core is arranged in the body, and a front cover and a rear cover are respectively arranged at the front and rear ends of the body along the extension direction of the rotor core. The motor is characterized in that the above-mentioned heat dissipation bearings are arranged on both the front cover and the rear cover, and the two ends of the rotor core are respectively installed in the inner sleeves of the two heat dissipation bearings.

[0016] In one embodiment of the present invention, a limiting block is provided on the inner wall of the inner sleeve, and a limiting groove matching the limiting block is provided on the rotor core.

[0017] In one embodiment of the present invention, the structures of installing the heat dissipation bearing inside the front cover and the rear cover are the same, and both the front cover and the rear cover are provided with bosses protruding inwards, and the outer sleeve is installed on the bosses.

[0018] In one embodiment of the present invention, an avoidance groove is provided in the boss, and the second liquid inlet pipe passes through the avoidance groove and is connected with the liquid infusion pipe.

[0019] The above technical solution of the present invention has the following advantages compared with the prior art:

[0020] The heat dissipation bearing of the present invention is provided with a first liquid storage cavity and a second liquid storage cavity in the inner sleeve and the outer sleeve respectively, and the first liquid storage cavity and the second liquid storage cavity are respectively filled with coolant through a liquid infusion tube. When the bearing is at a high temperature, the coolant can be injected, and the coolant stored in the first liquid storage cavity can be used to reduce the temperature of the inner sleeve by physical heat exchange. Similarly, the coolant stored in the second liquid storage cavity can be used to reduce the surface temperature of the outer sleeve, thereby performing heat exchange and cooling treatment on the bearing.

[0021] The superconducting motor with a heat dissipation bearing described in the present invention adopts the above-mentioned heat dissipation bearing to support the rotor core. When the rotor core drives the inner sleeve to rotate at high speed, the heat generated by friction is neutralized by the inner sleeve and the outer sleeve with lower temperatures, and the internal temperature of the machine body will not rise, which will affect the performance of the superconducting coil inside the machine body, and the performance of the superconducting motor can be maintained at the rated operating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

[0023] Figure 1 It is a schematic diagram of the overall structure of the heat dissipation bearing of the present invention;

[0024] Figure 2 The present invention Figure 1 A schematic diagram of the overall structure of the heat dissipation bearing from another perspective;

[0025] Figure 3 It is a schematic diagram of the left and right cross-sectional structure of the heat dissipation bearing of the present invention;

[0026] Figure 4 It is a schematic diagram of the front and rear cross-sectional structure of the heat dissipation bearing of the present invention;

[0027] Figure 5 It is a schematic diagram of the overall structure of the superconducting motor with a heat dissipation bearing of the present invention;

[0028] Figure 6 The present invention Figure 5 The overall structure diagram of the superconducting motor with heat dissipation bearing from another perspective;

[0029] Figure 7 It is a cross-sectional structural schematic diagram of the rear cover and the bearing assembly of the present invention;

[0030] Figure 8 The present invention Figure 7 A schematic diagram of the cross-sectional structure of the rear cover and the bearing assembly from another perspective.

[0031] Explanation of the markings in the drawings in the specification: 1. body; 2. rotor core; 21. limiting groove; 3. front cover; 4. rear cover; 5. heat dissipation bearing; 51. inner sleeve; 511. first liquid storage chamber; 512. heat dissipation groove; 513. heat dissipation ring; 514. outer groove; 515. limiting block; 52. outer sleeve; 521. second liquid storage chamber; 522. support block; 523. inner groove; 53. ball; 6. infusion tube; 7. first liquid inlet tube; 8. second liquid inlet tube; 9. boss; 91. avoidance groove. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0033] Example 1

[0034] Reference Figure 1-Figure 4 As shown, the heat dissipation bearing 5 of the present invention comprises an inner sleeve 51 and an outer sleeve 52 which are concentrically arranged. The inner sleeve 51 and the outer sleeve 52 can rotate relative to each other. A ball 53 is arranged between the inner sleeve 51 and the outer sleeve 52. The inner sleeve 51 and the outer sleeve 52 rotate relative to each other through the rotation of the ball 53.

[0035] The inner sleeve 51 is provided with a first liquid storage cavity 511, which is an annular cavity provided along the circumferential extension direction of the inner sleeve 51, and the first liquid storage cavity 511 is provided coaxially with the inner sleeve 51;

[0036] The outer sleeve 52 is provided with a second liquid storage cavity 521, which is an annular cavity provided along the circumferential extension direction of the outer sleeve 52, and the second liquid storage cavity 521 is coaxially provided with the outer sleeve 52;

[0037] The first liquid storage chamber 511 and the second liquid storage chamber 521 are both connected to the infusion tube, and the first liquid storage chamber 511 and the second liquid storage chamber 521 are filled with cooling liquid through the infusion tube;

[0038] The heat dissipation bearing 5 of this embodiment has the same movement mode as the existing ball bearing, and is different from the existing ball bearing in that a first liquid storage chamber 511 and a second liquid storage chamber 521 are respectively provided in the inner sleeve 51 and the outer sleeve 52, and coolant is respectively filled into the first liquid storage chamber 511 and the second liquid storage chamber 521 through an infusion tube. When the bearing is at a high temperature, the coolant can be injected and the temperature of the inner sleeve 51 can be lowered by physical heat exchange using the coolant stored in the first liquid storage chamber 511. Similarly, the surface temperature of the outer sleeve 52 can be lowered using the coolant stored in the second liquid storage chamber 521, thereby performing heat exchange and cooling treatment on the bearing.

[0039] Specifically, a plurality of methods can be used to set a liquid storage cavity in the shaft sleeve. In this embodiment, two methods are used as examples to respectively open a first liquid storage cavity 511 and a second liquid storage cavity 521 in the inner shaft sleeve 51 and the outer shaft sleeve 52.

[0040] The first method: an external first liquid storage chamber 511 is arranged in the inner sleeve 51, a heat dissipation groove 512 coaxial with the inner sleeve 51 is provided on the cross-sectional side wall of the inner sleeve 51, a heat dissipation ring 513 is arranged in the heat dissipation groove 512, and the first liquid storage chamber 511 is arranged in the heat dissipation ring 513. This method adopts an external opening method, in which a heat dissipation groove 512 is provided on one side of the inner sleeve 51, and a heat dissipation ring 513 is arranged and placed in the heat dissipation groove 512. This method is more suitable for opening the first liquid storage chamber 511 in the inner sleeve 51, because the size of the inner sleeve 51 is small. On the one hand, it is not easy to directly open the first liquid storage chamber 511 in the inner sleeve 51. On the other hand, if the first liquid storage chamber 511 is directly opened in the inner sleeve 51, the internal structure of the inner sleeve 51 is changed, which further reduces the supporting force of the inner sleeve 51 itself, and the inner sleeve 51 is easy to deform during operation.

[0041] The second method: a second liquid storage chamber 521 is built into the outer sleeve 52, and the second liquid storage chamber 521 is directly opened between the inner wall of the outer sleeve and the outer wall of the outer sleeve. Since the size of the outer sleeve 52 is relatively large, the second liquid storage chamber 521 can be directly set in the outer sleeve 52. In addition, in order not to affect the supporting performance of the outer sleeve 52 itself, a plurality of support blocks 522 are arranged in the second liquid storage chamber 521 in a circumferentially uniform manner. The two ends of the support block 522 are respectively connected to the inner wall of the outer sleeve and the outer wall of the outer sleeve. The width of the support block 522 is smaller than the width of the second liquid storage chamber 511. The setting of the support block 522 does not affect the connectivity of the second liquid storage chamber 521, and can further improve the strength inside the outer sleeve 52, thereby avoiding the reduction of the strength of the outer sleeve 52 due to the opening of the second liquid storage chamber 521.

[0042] Specifically, the coolant used in this embodiment is liquid nitrogen, which is liquid nitrogen, inert, colorless, odorless, non-corrosive, non-flammable, and extremely low in temperature; at normal pressure, the temperature of liquid nitrogen is -196°C; 1 cubic meter of liquid nitrogen can be expanded to 696 cubic meters of pure gaseous nitrogen at 21°C; liquid nitrogen is a liquid form of nitrogen formed at low temperature, and the boiling point of nitrogen is -196°C. If the temperature is below this under normal atmospheric pressure, liquid nitrogen will be formed.

[0043] Specifically, in order to prevent the ball 53 from rolling out from between the inner sleeve 51 and the outer sleeve 52, an annular inner groove 523 is opened in the middle position of the inner side of the outer sleeve 52, and an annular outer groove 514 is opened in the middle position of the outer side of the inner sleeve 51. The ball 53 is arranged between the inner groove 523 and the outer groove 514, and the movement direction of the ball 53 is restricted by the inner groove 523 and the outer groove 514.

[0044] Example 2

[0045] Reference Figure 5-Figure 8 As shown, this embodiment provides a superconducting motor with the above-mentioned heat dissipation bearing on the basis of the above-mentioned embodiment 1, the superconducting motor comprises a body 1, a rotor core 2 is arranged in the body 1, a front cover 3 and a rear cover 4 are respectively arranged at the front and rear ends of the body 1 along the extension direction of the rotor core 2, and heat dissipation bearings 5 ​​are arranged on the front cover 3 and the rear cover 4, the two ends of the rotor core 2 are respectively installed in the inner shaft sleeves 51 of the two heat dissipation bearings 5, the center positions of the front cover 3 and the rear cover 4 are each provided with a through hole, the diameter of the through hole is the same as the diameter of the rotor core 2, the rotor core 2 passes through the two heat dissipation bearings 5 ​​and then passes through the through hole, the heat dissipation bearings 5 ​​are arranged to prevent the rotor core 2 from directly contacting the front cover 3 and the rear cover 4, the front cover 3 and the rear cover 4 arranged at the front and rear ends of the body 1 play a limiting role on the rotor core 2, and control the rotor core 2 to be able to rotate only, and will not make the rotor core 2 move forward and backward;

[0046] Specifically, the first liquid storage chamber 511 and the second liquid storage chamber 521 are connected to the infusion tube 6 through the first liquid inlet tube 7 and the second liquid inlet tube 8 respectively. In this embodiment, two first liquid inlet tubes 7 are provided, the first liquid storage chamber 511 is connected to the two first liquid inlet tubes 7 respectively, two second liquid inlet tubes 8 are provided, the second liquid storage chamber 521 is connected to the two second liquid inlet tubes 8 respectively, and the infusion tube 6 is connected to the two first liquid inlet tubes 7 and the two second liquid inlet tubes 8 at the same time. The first liquid storage chamber 511 and the second liquid storage chamber 521 can be filled with coolant synchronously through the infusion tube 6, thereby reducing the steps of adding coolant and improving the efficiency of adding coolant.

[0047] The superconducting motor with the heat dissipation bearing 5 described in this embodiment adopts the heat dissipation bearing support 5 to support the rotor core 2. When the rotor core 2 drives the inner sleeve 51 to rotate at a high speed, the heat generated by friction is neutralized by the inner sleeve 51 and the outer sleeve 52 with lower temperatures, and the internal temperature of the motor body will not rise, which will affect the performance of the superconducting coil inside the motor body, and the performance of the superconducting motor can be maintained at the rated operating state.

[0048] The key point of this embodiment is how to install the heat dissipation bearing 5 on the superconducting motor of this embodiment to realize the linkage between the heat dissipation bearing 5 and the superconducting motor:

[0049] Specifically, in order to realize the linkage between the rotor core 2 and the inner sleeve 51, a limiting block 515 is provided on the inner wall of the inner sleeve 51, and a limiting groove 21 matching the limiting block 515 is provided on the rotor core 2. In this embodiment, two symmetrical limiting blocks 515 are provided on the inner wall of the inner sleeve 51, and the rotor core 2 drives the inner sleeve 51 to rotate by the clamping of the limiting blocks 515 and the limiting grooves 21.

[0050] Specifically, the heat dissipation groove 512 of this embodiment is opened on a side close to the front cover 3 and the rear cover 4, the heat dissipation ring 513 is fixed on the front cover 3 and the rear cover 4, and the first liquid inlet pipe 7 is also fixed on the front cover 3 and the rear cover 4;

[0051] Specifically, the structures of the heat dissipation bearings installed inside the front cover 3 and the rear cover 4 are the same, and inwardly protruding bosses 9 are provided on the front cover 3 and the rear cover 4, and the outer sleeve 52 is installed on the boss 9; since a second liquid inlet pipe 521 is provided on the outer sleeve 52 in the present embodiment, in order to lead the second liquid inlet pipe 521 out of the boss 9, an avoidance groove 91 is opened in the boss 9, and the second liquid inlet pipe 521 passes through the avoidance groove 91 and is connected with the infusion pipe 6.

[0052] Specifically, the assembly process and working principle of the superconducting motor of this embodiment are as follows:

[0053] First, assemble the body 1 so that the two ends of the rotor core 2 pass through the front cover 3 and the rear cover 4 respectively, install the heat dissipation bearing 5 composed of the outer sleeve 51, the inner sleeve 52 and the ball 53 into the inside of the boss 9, and use the heat dissipation bearing 5 installed inside the front cover 3 and the rear cover 4 to limit the rotor core 2. Through the cooperation of the limiting groove 21 and the limiting block 525, the rotor core 2 is partially located inside the inner sleeve 51. During the installation of the heat dissipation bearing 5, the heat dissipation ring 513 fixed on one side of the front cover 3 and the rear cover 4 is installed into the heat dissipation groove 512 opened on one side of the inner sleeve 51. The two groups of second liquid inlet pipes 8 arranged on the side of the outer sleeve 52 pass through the front cover 3 or the rear cover 4 and are connected to the infusion pipe 6. At the same time, the other two groups of interfaces of the infusion pipe 6 and the first The inner sleeve 51 and the outer sleeve 52 are connected to each other, and when the machine body is started, the rotor core 2 rotates, driving the inner sleeve 51 to rotate. During the rotation of the inner sleeve 51, the inner sleeve 51 and the outer sleeve 52 rub against the ball 53, and heat is generated during the friction. The liquid nitrogen stored in the first liquid storage chamber 511 reduces the surface temperature of the heat dissipation ring 513, and the temperature of the inner sleeve 51 is reduced by transferring the temperature through the heat dissipation ring 513. Similarly, the liquid nitrogen stored in the second liquid storage chamber 521 reduces the surface temperature of the outer sleeve 52. Therefore, the heat generated by the friction is neutralized by the inner sleeve 51 and the outer sleeve 52 with lower temperatures, and will not increase the internal temperature of the machine body, thereby affecting the performance of the superconductor inside the machine body, and maintaining the performance peak of the superconducting motor.

[0054] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A heat dissipation bearing, comprising an inner sleeve and an outer sleeve arranged concentrically, characterized in that: The inner sleeve is provided with a first liquid storage cavity, which is an annular cavity along the inner sleeve, the first liquid storage cavity is coaxially arranged with the inner sleeve, a heat dissipation groove coaxial with the inner sleeve is provided on the cross-sectional side wall of the inner sleeve, a heat dissipation ring is provided in the heat dissipation groove, and the first liquid storage cavity is provided in the heat dissipation ring; A second liquid storage cavity is provided in the outer sleeve, the second liquid storage cavity is an annular cavity along the outer sleeve, the second liquid storage cavity is coaxially arranged with the outer sleeve, the second liquid storage cavity is directly opened between the inner wall of the outer sleeve and the outer wall of the outer sleeve, a plurality of support blocks uniformly arranged around the circumference are provided in the second liquid storage cavity, the two ends of the support blocks are respectively connected to the inner wall of the outer sleeve and the outer wall of the outer sleeve, and the width of the support blocks is smaller than the width of the second liquid storage cavity; Wherein, the first liquid storage chamber and the second liquid storage chamber are both connected to the infusion tube, and the first liquid storage chamber and the second liquid storage chamber are filled with cooling liquid through the infusion tube.

2. The heat dissipation bearing according to claim 1, characterized in that: The first liquid storage chamber and the second liquid storage chamber are connected to the liquid infusion tube through the first liquid inlet tube and the second liquid inlet tube respectively.

3. The heat dissipation bearing according to claim 1, characterized in that: A ball is also arranged between the inner sleeve and the outer sleeve, an inner ring-shaped groove is provided in the middle of the inner side of the outer sleeve, and an outer ring-shaped groove is provided in the middle of the outer side of the inner sleeve, and the ball is arranged between the inner and outer grooves.

4. A superconducting motor with a heat dissipation bearing, comprising a body, a rotor core is arranged in the body, and a front cover and a rear cover are arranged at the front and rear ends of the body respectively along the extension direction of the rotor core, characterized in that: The front cover and the rear cover are both provided with the heat dissipation bearing according to any one of claims 1 to 3, and the two ends of the rotor core are respectively installed in the inner sleeves of the two heat dissipation bearings.

5. The superconducting motor with a heat dissipation bearing according to claim 4, characterized in that: A limiting block is arranged on the inner wall of the inner sleeve, and a limiting groove matching the limiting block is arranged on the rotor core.

6. The superconducting motor with a heat dissipation bearing according to claim 4, characterized in that: The heat dissipation bearings are installed in the same structure inside the front cover and the rear cover. Both the front cover and the rear cover are provided with bosses protruding inwards, and the outer sleeve is installed on the bosses.

7. The superconducting motor with a heat dissipation bearing according to claim 6, characterized in that: An avoidance groove is provided in the boss, the second liquid storage cavity is communicated with the liquid infusion tube through a second liquid inlet tube, and the second liquid inlet tube passes through the avoidance groove and is communicated with the liquid infusion tube.

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