CN113700744A

CN113700744A - Magnetic suspension bearing, compressor and air conditioner

Info

Publication number: CN113700744A
Application number: CN202111116699.4A
Authority: CN
Inventors: 龚高; 张芳; 张超; 王飞; 陈艳霞
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2021-11-26
Anticipated expiration: 2041-09-23
Also published as: CN113700744B

Abstract

The application provides a magnetic suspension bearing, a compressor and an air conditioner. The magnetic suspension bearing comprises a rotating shaft (1) and a thrust disc (2) arranged at the first end of the rotating shaft (1), wherein axial bearings (3) are respectively arranged at two ends of the thrust disc (2), the thrust disc (2) is sleeved outside the rotating shaft (1), a sealed filling groove (5) is formed between the thrust disc (2) and the rotating shaft (1), the part of the same filling groove (5) is positioned on the thrust disc (2), the part of the same filling groove is positioned on the rotating shaft (1), a filling channel (6) communicated with the filling groove (5) is arranged on the thrust disc (2) and/or the rotating shaft (1), and a connecting block (7) which is filled into the filling groove (5) through the filling channel (6) and then solidifies is filled in the filling groove (5). According to the magnetic suspension bearing, the thrust disc can be effectively locked, looseness of the thrust disc is avoided, and stability of the thrust disc is improved.

Description

Magnetic suspension bearing, compressor and air conditioner

Technical Field

The application relates to the technical field of magnetic suspension, in particular to a magnetic suspension bearing, a compressor and an air conditioner.

Background

Compared with the traditional rolling bearing and sliding bearing, the magnetic suspension bearing suspends the rotating shaft by utilizing the electromagnetic force to the rotor, and the rotating shaft and the stator are kept in a non-contact state, so that the magnetic suspension bearing has the advantages of no abrasion, high rotating speed, high precision, long service life and the like. However, the magnetic suspension axial bearing realizes the axial movement of the rotating shaft, and the rotating shaft is essentially required to be provided with an axial stressed component, namely a thrust disc, so that the thrust disc and the rotating shaft are integrated, and the movement of the thrust disc needs to drive the rotating shaft to move, so that the thrust disc is fastened on the rotating shaft and cannot be loosened.

The thrust disc wraps the end of a rotating shaft, threads are arranged on an inner ring of the thrust disc and are matched with the rotating shaft, the axial direction and the rotating shaft are reinforced by bolts, and the thrust disc needs to be matched with the bolts when the thrust disc is screwed during assembly, so that the thrust disc can not be locked easily.

Disclosure of Invention

Therefore, the technical problem that this application will be solved lies in providing a magnetic suspension bearing, compressor and air conditioner, can guarantee that the thrust dish is effectively locked, avoids the thrust dish to take place not hard up, improves the stability of thrust dish.

In order to solve the problem, the application provides a magnetic suspension bearing, including pivot and the thrust disc of setting in the first end of pivot, the both ends of thrust disc are provided with axial bearing respectively, the thrust disc cover is established outside the pivot, form sealed packing groove between thrust disc and the pivot, same packing groove position is on the thrust disc, the part is located the pivot, be provided with in thrust disc and/or the pivot with fill the notes passageway that fills of groove intercommunication, it is filled with to fill through filling the passageway and fills the connecting block that solidifies after filling the inslot.

Preferably, the connecting block is a metal block.

Preferably, the metal block is solid at room temperature and has a melting point of 100 to 250 ℃.

Preferably, the metal block is a tin alloy.

Preferably, the filling groove comprises an annular groove positioned between the thrust disc and the rotating shaft and a first groove positioned on the outer groove wall of the annular groove, the first groove is communicated with the annular groove, and the filling channel is communicated with the first groove.

Preferably, the first groove is a plurality of grooves arranged along the circumferential direction of the annular groove.

Preferably, the filling groove comprises an annular groove positioned between the thrust disc and the rotating shaft and a second groove positioned on the inner groove wall of the annular groove, the second groove is communicated with the annular groove, and the filling channel is communicated with the annular groove.

Preferably, the second groove is a plurality of grooves arranged along the circumferential direction of the annular groove.

Preferably, the filling channel opens upwards.

Preferably, the thrust disc and the rotating shaft are in interference fit.

Preferably, the rotating shaft is provided with a shaft shoulder, and the thrust disc is axially limited at the shaft shoulder.

Preferably, coils are arranged in the axial bearing, and an operation through hole is arranged on the thrust disc and is positioned between the coils at two ends of the thrust disc.

According to another aspect of the present application, there is provided a compressor comprising a magnetic bearing, which is the above-mentioned magnetic bearing.

According to another aspect of the present application, there is provided an air conditioner comprising a magnetic suspension bearing, which is the above magnetic suspension bearing.

The application provides a magnetic suspension bearing, including pivot and the thrust disc of setting in the first end of pivot, the both ends of thrust disc are provided with axial bearing respectively, the thrust disc cover is established outside the pivot, form sealed packing groove between thrust disc and the pivot, same packing groove position is in the thrust disc, the part is located the pivot, be provided with in thrust disc and/or the pivot fill the notes passageway with filling the groove intercommunication, it is filled with to fill through filling the passageway and fills the connecting block that solidifies after filling the inslot. This magnetic suspension bearing's thrust disc and pivot between be formed with the filling groove, the intussuseption is filled with the connecting block after solidifying in the filling groove, can utilize the adhesive force after the connecting block solidifies to be in the same place thrust disc and pivot fixed connection, realizes thrust disc at the axial and radially ascending dual fixed, and structural strength is good, and the integration degree is high, has reduced the not hard up of thrust disc, has guaranteed the stability of thrust disc, has improved the performance of compressor, the cost is reduced.

Drawings

FIG. 1 is a schematic perspective cross-sectional view of a magnetic suspension bearing according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a thrust disc of a magnetic suspension bearing according to an embodiment of the present application;

FIG. 3 is a schematic perspective view of a thrust disc of a magnetic suspension bearing according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a connecting block of a magnetic suspension bearing according to an embodiment of the present application;

fig. 5 is an exploded view of a magnetic suspension bearing according to an embodiment of the present application.

The reference numerals are represented as:

1. a rotating shaft; 2. a thrust disc; 3. an axial bearing; 4. a shaft shoulder; 5. filling the groove; 6. a fill channel; 7. connecting blocks; 8. an annular groove; 9. a first groove; 10. a second groove; 11. a coil; 12. the through hole is operated.

Detailed Description

With reference to fig. 1 to 5, according to an embodiment of the present application, a magnetic suspension bearing includes a rotating shaft 1 and a thrust disc 2 disposed at a first end of the rotating shaft 1, axial bearings 3 are respectively disposed at two ends of the thrust disc 2, the thrust disc 2 is sleeved outside the rotating shaft 1, a sealed filling groove 5 is formed between the thrust disc 2 and the rotating shaft 1, a portion of the same filling groove 5 is disposed on the thrust disc 2, a portion of the same filling groove 5 is disposed on the rotating shaft 1, a filling channel 6 communicated with the filling groove 5 is disposed on the thrust disc 2 and/or the rotating shaft 1, and a connecting block 7 which is filled into the filling groove 5 through the filling channel 6 and then is solidified is filled in the filling groove 5.

This magnetic suspension bearing's thrust disc 2 and pivot 1 between be formed with filling groove 5, be filled with the connecting block 7 after solidifying in filling groove 5 intussuseption, can utilize the adhesive force after connecting block 7 solidifies to be in the same place thrust disc 2 and pivot 1 fixed connection, realize thrust disc 2 in the axial with radial ascending dual fixed, structural strength is good, the integration degree is high, the not hard up of thrust disc 2 has been reduced, the stability of thrust disc 2 has been guaranteed, the performance of compressor has been improved, the cost is reduced.

In one embodiment, the connection block 7 is a metal block. The solidified solid metal blocks can fix the thrust disc 2 in the axial direction and the radial direction, so that the looseness of the thrust disc 2 is avoided, the damage to the axial bearing 3 and the rotating shaft 1 is avoided, and the failure package return rate of the magnetic suspension compressor is reduced.

The connecting piece 7 can also be made of other thermoplastic materials with good connecting properties and sufficient connecting strength, such as plastic materials like polyoxymethylene and polyvinyl chloride.

In one embodiment, the metal block is solid at normal temperature, the melting point of the metal block is 100-250 ℃, and the melting point is lower than the melting points of the thrust disc 2 and the rotating shaft 1, so that the damage to the structures of the rotating shaft 1 and the thrust disc 2 in the process of filling liquid metal can be avoided, and the connection effect of the metal block on the thrust disc 2 and the rotating shaft 1 at normal temperature can be ensured.

In one embodiment, the metal block is a tin alloy, such as a tin-bismuth alloy, a tin-zinc alloy, a tin-copper alloy, or the like.

In one embodiment, the filling groove 5 comprises an annular groove 8 between the thrust disc 2 and the rotating shaft 1 and a first groove 9 on the outer groove wall of the annular groove 8, the first groove 9 is communicated with the annular groove 8, and the filling channel 6 is communicated with the first groove 9. In this embodiment, the annular groove 8 may be completely located on the rotating shaft 1, the first grooves 9 are provided on the inner circumferential wall of the thrust disc 2, after the liquid metal with a low melting point is injected into one of the first grooves 9 from the filling channel 6, the liquid metal enters the annular groove 8 from the first groove 9, then flows along the circumferential direction of the annular groove 8, and finally reaches the annular groove 8 and each first groove 9, and after the metal is solidified at normal temperature, the formed solid metal block can fix the thrust disc 2 in the axial and radial directions.

In one embodiment, the first grooves 9 are multiple and uniformly arranged along the circumferential direction of the annular groove 8, so that the balance of the interaction force between the thrust disc 2 and the rotating shaft 1 can be improved.

In one embodiment, the filling groove 5 comprises an annular groove 8 between the thrust disc 2 and the rotating shaft 1 and a second groove 10 on the inner wall of the annular groove 8, the second groove 10 is communicated with the annular groove 8, and the filling channel 6 is communicated with the annular groove 8. In this embodiment, the annular groove 8 can be located on the thrust disc 2 completely, the second grooves 10 are arranged on the outer peripheral wall of the rotating shaft 1, after the liquid metal with a low melting point is injected into the annular groove 8 from the filling channel 6, the liquid metal can flow along the circumferential direction of the annular groove 8 and reach each second groove 10 through the annular groove 8, a gap between the thrust disc 2 and the rotating shaft 1 is filled, and after the metal is solidified at normal temperature, the formed solid metal block can fix the thrust disc 2 in the axial direction and the radial direction.

In one embodiment, the second grooves 10 are plural and are uniformly arranged along the circumferential direction of the annular groove 8.

In one embodiment, the filling channel 6 is open upwards during the filling process, which makes it easier to perform the filling operation of the liquid metal.

In one embodiment, the thrust disc 2 and the rotating shaft 1 are in interference fit, so that the sealing performance of the filling groove 5 between the thrust disc 2 and the rotating shaft 1 can be ensured, the phenomenon of liquid metal leakage is effectively avoided, and the reliability of the metal filling process is improved.

In one embodiment, the rotating shaft 1 is provided with a shaft shoulder 4, and the thrust disc 2 is axially limited at the shaft shoulder 4. The shaft shoulder 4 can limit the axial installation position of the thrust disc 2 on the rotating shaft 1, and the axial installation precision of the thrust disc 2 is guaranteed.

The above-described inflation process is equally applicable to inflation of other materials. The filling channel 6 is, for example, a hole-filled type.

In one embodiment, the axial bearing 3 is provided with coils 11, and the thrust disc 2 is provided with an operation through hole 12, wherein the operation through hole 12 is positioned between the coils 11 at two ends of the thrust disc 2.

In one embodiment, the number of the operation through holes 12 is 3 to 6, and the operation through holes 12 are uniformly arranged in the circumferential direction of the thrust disk 2. The operation through hole 12 is, for example, a threaded through hole.

When the quantity of operation through-hole 12 was 2, the quantity was too little, and the thrust dish is difficult to lock, and when the quantity of operation through-hole 12 exceeded 6, can influence thrust dish structural stability. The operating through holes 12 are required to be located at positions between the two coils 11 and are uniformly distributed along the circumferential direction, and if the operating through holes are located at the radial inner side of the coils 11, the stress position of the thrust disc 2 is poor, and if the operating through holes are located at the radial outer side of the coils 11, the thrust disc 2 is not well tightened due to the stress of the operating through holes 12.

During assembly, the axial bearings 3 are positioned at two ends of the thrust disc 2, and assembly gaps at the two ends are equal. The thrust disc 2 is provided with three threaded through holes, so that assembly and disassembly by using a tool are facilitated, and 4 first grooves 9 are designed on the inner circle of the thrust disc 2, so that the thrust disc 2 is conveniently fixed in the axial direction and the radial direction, the thrust disc 2 is not easy to move, and the stability of the thrust disc 2 is ensured; secondly, reduce the area of contact of thrust dish 2 and pivot 1, convenient dismantlement.

Thrust disc 2 adopts interference fit to assemble to pivot 1 on, guarantees the leakproofness in clearance between the two, utilizes the epaxial shaft shoulder 4 of pivot 1 to be used for thrust disc 2 axial positioning, fills to annotate the in-process and need notice the embedment hole up. After the thrust disc 2 is installed, liquid metal with a lower melting point is injected into the filling and sealing hole by the aid of the tool, the liquid metal automatically flows into and fills a gap between the thrust disc 2 and the rotating shaft 1 by the aid of the annular groove 8 in the rotating shaft 1, a solid metal block is formed after the metal is solidified at normal temperature, and the thrust disc 2 can be prevented from moving in the axial direction and the radial direction when the metal block runs at high speed.

During the dismantlement, earlier with filling hole on the thrust dish 2 down, later face thrust dish 2 bottoms and heat, use the container to catch the liquid metal that flows under the filling hole, after the metal flows out completely, utilize three screw through-hole on the thrust dish 2 to dismantle thrust dish 2 with the help of the frock.

In the magnetic suspension bearing of the embodiment, the thrust disc 2 is arranged on the rotating shaft 1 in an interference fit manner, and the thrust disc 2 is axially and radially fixed by adopting the metal blocks in a normal-temperature solid state, so that when the interference magnitude disappears in the environment of eccentricity and thermal expansion at a high rotating speed, the thrust disc 2 is effectively prevented from being axially loosened and damaging the axial bearing 3; compared with a bolt structure in a related structure, the fixing effect is stronger, and the phenomenon that the axial movement or resonance of the thrust disc 2 occurs due to the fact that the bolt of the thrust disc 2 is loosened at a higher rotating speed can be avoided.

According to an embodiment of the present application, the compressor comprises a magnetic bearing, which is the above-mentioned magnetic bearing.

According to an embodiment of the present application, the air conditioner includes a magnetic bearing, which is the above-mentioned magnetic bearing.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. The utility model provides a magnetic suspension bearing, its characterized in that is in including pivot (1) and setting the thrust disc (2) of pivot (1) first end, the both ends of thrust disc (2) are provided with axial bearing (3) respectively, thrust disc (2) cover is established outside pivot (1), thrust disc (2) with form sealed filling groove (5) between pivot (1), it is same the part of filling groove (5) is located on thrust disc (2), the part is located on pivot (1), thrust disc (2) and/or be provided with on pivot (1) with fill notes passageway (6) of filling groove (5) intercommunication, it is filled with the warp to fill in passageway (6) and fills and go into fill connecting block (7) that the back solidifies in groove (5).

2. Magnetic bearing according to claim 1, characterized in that the connection block (7) is a metal block.

3. The magnetic suspension bearing according to claim 2, wherein the metal block is solid at normal temperature and has a melting point of 100-250 ℃.

4. Magnetic bearing according to claim 3, characterized in that the metal block is a tin alloy.

5. Magnetic bearing according to any of claims 1 to 4, characterized in that the filling channel (5) comprises an annular groove (8) between the thrust disk (2) and the rotary shaft (1) and a first groove (9) on the outer groove wall of the annular groove (8), the first groove (9) communicating with the annular groove (8), the filling channel (6) communicating with the first groove (9).

6. Magnetic bearing according to claim 5, characterized in that the first groove (9) is a plurality and arranged along the circumference of the annular groove (8).

7. Magnetic bearing according to any of claims 1 to 4, characterized in that the filling channel (5) comprises an annular groove (8) between the thrust disk (2) and the rotary shaft (1) and a second groove (10) on the inner wall of the annular groove (8), the second groove (10) communicating with the annular groove (8), the filling channel (6) communicating with the annular groove (8).

8. Magnetic bearing according to claim 7, characterized in that the second groove (10) is a plurality of grooves arranged along the circumference of the annular groove (8).

9. Magnetic bearing according to any of claims 1 to 4, characterized in that the filling channel (6) opens upwards.

10. Magnetic bearing according to any of claims 1 to 4, characterized in that the thrust disc (2) is an interference fit with the shaft (1).

11. Magnetic bearing according to any of claims 1 to 4, characterized in that a shaft shoulder (4) is provided on the rotating shaft (1), the thrust disc (2) being axially limited at the shaft shoulder (4).

12. Magnetic bearing according to any of claims 1 to 4, characterized in that coils (11) are arranged in the axial bearing (3) and that an operating through hole (12) is arranged in the thrust disc (2), said operating through hole (12) being located between the coils (11) at both ends of the thrust disc (2).

13. A compressor, characterized by comprising a magnetic bearing as claimed in any one of claims 1 to 12.

14. An air conditioner, characterized in that, comprises a magnetic suspension bearing, wherein the magnetic suspension bearing is the magnetic suspension bearing of any one of claims 1 to 12.