CN113864340A

CN113864340A - Rotating shaft protection structure and magnetic suspension compressor

Info

Publication number: CN113864340A
Application number: CN202111263530.1A
Authority: CN
Inventors: 胡余生; 郭伟林; 龚高; 张芳; 李欣
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2021-12-31

Abstract

The application provides a rotating shaft protection structure and a magnetic suspension compressor. The rotating shaft protection structure comprises a rotor assembly and a protection bearing (3), wherein the rotor assembly comprises a rotating shaft (1), a first step (2) is arranged at one end of the rotating shaft (1), the protection bearing (3) is sleeved on the rotating shaft (1), an axial stopping structure is arranged on one side, away from the first step (2), of the protection bearing (3), and the protection bearing (3) is axially limited between the first step (2) and the axial stopping structure. According to the rotating shaft protection structure, the magnetic bearing can be effectively protected, and the magnetic bearing is prevented from being damaged.

Description

Rotating shaft protection structure and magnetic suspension compressor

Technical Field

The application relates to the technical field of compressors, in particular to a rotating shaft protection structure and a magnetic suspension compressor.

Background

In recent years, in order to achieve high-speed rotation, a shaft of a centrifugal compressor is sometimes rotatably supported by a magnetic bearing. By supporting the shaft by the magnetic bearing in this manner, frictional heat is not generated between the shaft and the bearing. Therefore, seizure between the shaft and the bearing due to frictional heat can be prevented, and the shaft can be rotated at high speed.

Such a magnetic bearing does not directly contact the shaft and therefore does not have high strength as a support shaft. Therefore, when the shaft is unintentionally displaced from the reference position due to a power failure, an earthquake, or the like and comes into contact with the magnetic bearing, there is a possibility that the magnetic bearing is damaged.

Disclosure of Invention

Therefore, the technical problem to be solved by the present application is to provide a rotating shaft protection structure and a magnetic suspension compressor, which can effectively protect a magnetic bearing and prevent the magnetic bearing from being damaged.

In order to solve the above problem, the application provides a pivot protection architecture, including rotor subassembly and protection bearing, the rotor subassembly includes the pivot, and the one end of pivot has first step, and the protection bearing housing is established in the pivot, and one side that first step was kept away from to the protection bearing is provided with axial backstop structure, and the protection bearing axial is spacing between first step and axial backstop structure.

Preferably, the axial stop structure comprises an axial protection baffle ring, and the axial protection baffle ring is fixedly arranged on one side of the protection bearing far away from the first step.

Preferably, the axial protection baffle ring has an internal thread, the rotating shaft has an external thread, and the axial protection baffle ring is in threaded connection with the external thread of the rotating shaft through the internal thread

Preferably, the axial protection baffle ring is provided with radial screw holes along the radial direction, and the axial protection baffle ring is axially positioned through radial bolts arranged in the radial screw holes.

Preferably, the rotating shaft comprises a radial matching section, the protection bearing is sleeved on the radial matching section and is matched with the radial matching section to form a radial protection structure, the first step is located at a first end of the radial matching section, and the axial stopping structure is located at a second end of the radial matching section.

Preferably, the second end of radial cooperation section is provided with the second step, and axial backstop structure includes that the radial outside axle that sets gradually along the axial stretches section, linkage segment and radial inboard axle and stretches the section, and radial outside axle stretches the section cover and establishes outside radial cooperation section to with the cooperation of first step, the axial displacement of restriction protection bearing, the linkage segment can backstop on the step face of second step, and radial inboard axle stretches the section cover and establishes on the path section of second step, and with path section fixed connection.

Preferably, the protective bearing is a rolling bearing or a collar supported by a wear resistant material.

Preferably, the second end of the radial fitting section is provided with a second step, a clearance adjusting element is arranged between the axial stopping structure and the second step, and the clearance adjusting element can adjust an axial clearance between the axial stopping structure and the second step.

Preferably, the gap-setting element is a metal rubber ring or a corrugated spring washer.

According to another aspect of the present application, there is provided a magnetic levitation compressor, including a rotation shaft protection structure, which is the above-mentioned rotation shaft protection structure.

The application provides a pivot protection architecture, including rotor subassembly and protection bearing, the rotor subassembly includes the pivot, and the one end of pivot has first step, and the protection bearing housing is established in the pivot, and one side that first step was kept away from to the protection bearing is provided with axial backstop structure, and the protection bearing axial is spacing between first step and axial backstop structure. This pivot protection architecture can utilize axial backstop structure and first step cooperation, carries on spacingly to the axial displacement of countershaft to can utilize axial backstop structure and first step spacing to the axial of countershaft, form effective protection to axial magnetic suspension bearing, avoid axial magnetic suspension bearing to take place the damage.

Drawings

Fig. 1 is a schematic structural diagram of a rotating shaft protection structure according to an embodiment of the present application;

FIG. 2 is a schematic view of an axial protective ring of the spindle protection configuration according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a spindle protection structure according to an embodiment of the present application;

FIG. 4 is a perspective view of a first gap adjustment element of a spindle protector according to an embodiment of the present application;

FIG. 5 is a schematic view of a second gap adjustment element of a shaft protection structure according to an embodiment of the present application;

FIG. 6 is a partial perspective view of a second clearance adjustment element of a spindle guard according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a spindle protection structure according to an embodiment of the present application;

FIG. 8 is a schematic view of a protective collar of a spindle protection configuration according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a protection collar of a spindle protection structure according to an embodiment of the present application.

The reference numerals are represented as:

1. a rotating shaft; 2. a first step; 3. protecting the bearing; 4. an axial protection retainer ring; 5. a radial screw hole; 6. a radial mating section; 7. a second step; 8. a radially outer axially extending section; 9. a connecting section; 10. a protective ferrule; 11. a sleeve; 12. a positioning flange; 13. a lock nut; 14. a radially inner axial extension section; 15. a gap adjusting element; 16. and a deformation groove.

Detailed Description

With reference to fig. 1 to 9, according to an embodiment of the present application, the rotating shaft protection structure includes a rotor assembly and a protection bearing 3, the rotor assembly includes a rotating shaft 1, one end of the rotating shaft 1 has a first step 2, the protection bearing 3 is sleeved on the rotating shaft 1, one side of the protection bearing 3 away from the first step 2 is provided with an axial stopping structure, and the protection bearing 3 is axially limited between the first step 2 and the axial stopping structure.

This pivot protection architecture can utilize axial backstop structure and first step 2 cooperation, carries on spacingly to the axial displacement of countershaft 1 to can utilize axial backstop structure and first step 2 spacing to the axial of countershaft 1, form effective protection to axial magnetic suspension bearing, avoid axial magnetic suspension bearing to take place the damage.

In one embodiment, the axial stop structure comprises an axial protective retainer ring 4, and the axial protective retainer ring 4 is fixedly arranged on the side of the protective bearing 3 away from the first step 2. In this embodiment, the axial protection retainer ring 4 is matched with the first step 2, the axial displacement of the protection bearing 3 is limited from the two sides of the protection bearing 3, and the axial displacement of the protection bearing 3 is limited, so that the effect of protecting the axial bearing is achieved.

In one embodiment, the axial protective ring 4 has an internal thread, the rotating shaft 1 has an external thread, and the axial protective ring 4 is screwed with the external thread of the rotating shaft 1 through the internal thread. The axial protection baffle ring 4 is fixed with the rotating shaft 1 in a threaded manner, so that the axial positioning between the axial protection baffle ring 4 and the rotating shaft 1 can be ensured, and the axial positioning precision between the axial protection baffle ring 4 and the first step 2 can be further ensured. In this embodiment, in order to avoid the axial protection to keep off ring 4 and take place the displacement in the course of the work, the screw thread cooperation between axial protection fender ring 4 and pivot 1 can select for use fine thread to utilize the helicitic texture to carry out the auto-lock, prevent to take place the pine and take off.

In one embodiment, the axial protection baffle ring 4 is radially provided with radial screw holes 5, and the axial protection baffle ring 4 is axially positioned by radial bolts provided in the radial screw holes 5. In this embodiment, when the axial protection baffle ring 4 is in threaded connection with the rotating shaft 1, the radial bolt in the radial screw hole 5 is used to further axially position the axial protection baffle ring 4, so that the radial bolt can be used to lock and increase the friction force between the axial protection baffle ring 4 and the thread on the rotating shaft 1, and the reliability of axial positioning is improved. In this embodiment, the number of the radial screw holes 5 is at least two, and the radial screw holes are uniformly distributed along the circumferential direction of the axial protection baffle ring 4, so that a better axial locking effect can be achieved. The number of radial screw holes 5 is typically 3 or 4.

In one embodiment, the rotating shaft 1 includes a radial fitting section 6, the protection bearing 3 is sleeved on the radial fitting section 6 and is matched with the radial fitting section 6 to form a radial protection structure, the first step 2 is located at a first end of the radial fitting section 6, and the axial stopping structure is located at a second end of the radial fitting section 6. In this embodiment, the radial matching section 6 has a high processing precision and can form a good radial matching with the protection bearing 3, so that the radial matching between the radial matching section 6 and the protection bearing 3 can be utilized to effectively protect the radial magnetic suspension bearing.

This pivot protection architecture can be in the same place radial protection architecture and axial protection architecture integration to can shorten the axial length of pivot 1, reduce the amount of deflection of pivot 1, reduce the complete machine volume, reduce cost.

In one embodiment, the second end of the radial matching section 6 is provided with a second step 7, the axial stopping structure comprises a radial outer side shaft extension section 8, a connecting section 9 and a radial inner side shaft extension section 14 which are sequentially arranged along the axial direction, the radial outer side shaft extension section 8 is sleeved outside the radial matching section 6 and is matched with the first step 2 to limit the axial displacement of the protective bearing 3, the connecting section 9 can be stopped on the step surface of the second step 7, and the radial inner side shaft extension section 14 is sleeved on the small diameter section of the second step 7 and is fixedly connected with the small diameter section.

In this embodiment, the end surface of the radially outer axially extending section 8 is one of the axial locating surfaces of the protective bearing 3, which cooperates with the first step 2 to limit the axial displacement of the protective bearing 3. The radial outer side shaft extension section 8 is sleeved on the outer peripheral side of the radial matching section 6, and the axial matching clearance between the protection bearing and the first step 2 and the radial outer side shaft extension section 8 can be effectively adjusted by adjusting the axial extension length of the radial outer side shaft extension section 8, so that the protection of the axial bearings with different specifications can be adapted.

The connecting section 9 keeps off the axial positioning terminal surface between ring 4 and the pivot 1 for axial protection towards the one end terminal surface of radial cooperation section 6, has injectd axial protection and has kept off the axial displacement position of ring 4 in pivot 1, through the distance between the cooperation terminal surface of injecing connecting section 9 and the location terminal surface of radial outside axle extension section 8, can effectively guarantee that axial protection keeps off the axial spacing precision of ring 4 to protection bearing 3.

In one embodiment, the protective bearing 3 is a rolling bearing or a collar supported by a wear resistant material.

In this embodiment, the rotating shaft protection structure includes a rotating shaft 1, a protection bearing 3 and an axial protection baffle ring 4, the protection bearing 3 is directly or indirectly fixed to the housing, and may be a rolling bearing or a collar made of a wear-resistant material. A radial gap x formed between the protection bearing 3 and the rotor assembly is the minimum radial gap in the whole compressor, so that the magnetic suspension bearing, the motor or the impeller and the like can be prevented from being collided and abraded with the stator, and a radial protection effect is achieved; a gap z is formed between the first end face of the axial protection baffle ring 4 and the step face of the first step 2 of the rotor assembly, and the difference z-y between the gap z and the width y of the protection bearing 3 is the minimum axial gap in the whole compressor, so that the axial protection effect is achieved.

The axial protection keeps off ring 4 and rotor subassembly and passes through threaded connection, realizes the regulation of clearance z through the screw thread, and the small screw of axial protection 4 circumferencial direction evenly distributed simultaneously, through locking the small screw of n, increase and pivot 1 go up the frictional force of screw thread, and the cooperation screw thread guarantees that axial protection keeps off the fixed of 4 axial position of ring, and n is generally 3 or 4. The adjustment range of the gap z can be enlarged by increasing the distance between the axial positioning surface of the radially outer axial extension section 8 of the axial protection baffle ring 4 and the axial positioning surface of the connecting section 9.

The rotating shaft protection structure realizes radial and axial integrated protection, meanwhile, the embodiment does not need part replacement or reprocessing, and the adjustment of the axial protection gap can be realized only through an assembly mode, so that the structure is simple, the structural modification of the magnetic suspension compressor is small, and the cost is low.

In one embodiment, the second end of the radial mating section 6 is provided with a second step 7, and a gap adjustment element 15 is provided between the axial stop and the second step 7, the gap adjustment element 15 being capable of adjusting the axial gap between the axial stop and the second step 7. In this embodiment, the axial stopping structure includes a radial outer side shaft extension section 8, a connection section 9 and a radial inner side shaft extension section 14, which are sequentially arranged along the axial direction, the radial outer side shaft extension section 8 is sleeved outside the radial matching section 6 and is matched with the first step 2 to limit the axial displacement of the protection bearing 3, the radial inner side shaft extension section 14 is sleeved on the small diameter section of the second step 7 and is in threaded connection with the small diameter section, the gap adjusting element 15 is arranged between the connection section 9 and the second step 7, one end of the gap adjusting element 15 is in surface contact with the step of the second step 7, the other end of the gap adjusting element 15 is in end surface contact with the connection section 9, the gap adjusting element 15 is an elastic member, and the adjustment of the gap z can be realized jointly through the compression of the gap adjusting element 15 and the threaded connection fixing action between the radial inner side shaft extension section 14 and the small diameter section of the second step 7.

In one embodiment, the gap-setting element 15 is a metal rubber ring or a corrugated spring washer. The metal rubber ring is of an annular structure made of metal rubber materials, the corrugated elastic pad is of an annular structure made of spring steel, and a plurality of corrugated structures exist on the ring and can realize elastic deformation by utilizing the corrugated structures.

In one embodiment, the axial stopping structure comprises a protection ring 10, the protection ring 10 comprises a sleeve 11 and a positioning flange 12 arranged at one end of the sleeve 11, the protection bearing 3 is sleeved outside the sleeve 11, and the positioning flange 12 is located at one end of the protection bearing 3 far away from the first step 2 and is matched with the first step 2 to limit the axial displacement of the protection bearing 3.

In this embodiment, the sleeve 11 of the protection ring 10 is sleeved outside the rotating shaft 1, the positioning flange 12 and the sleeve 11 are integrally formed, the end face of the positioning flange 12 facing the first step 2 is matched with the first step 2 to form axial limitation on the protection bearing 3, and the axial displacement of the protection bearing 3 is limited to achieve the effect of protecting the axial bearing.

In one embodiment, the protective collar 10 is shrink-fitted onto the shaft 1. The protection ferrule 10 can be in interference fit with the rotating shaft 1 in a shrink fit manner, so that the protection ferrule 10 is fixedly connected with the rotating shaft 1.

In one embodiment, the side of the protection collar 10 remote from the first step 2 is provided with a lock nut 13, and the lock nut 13 is fixedly arranged on the rotating shaft 1 and cooperates with the first step 2 to define the axial position of the protection collar 10. In this embodiment, the lock nut 13 is screwed with the rotating shaft 1 to lock the axial position of the protection ring 10, thereby ensuring the axial limiting effect of the protection ring 10 on the protection bearing 3. In this embodiment, the protection ferrule 10 and the lock nut 13 are separately disposed, the protection ferrule 10 and the rotating shaft 1 are in transition fit, or in small clearance fit, or in small interference fit, the small clearance fit refers to that the clearance fit between the protection ferrule 10 and the rotating shaft 1 is the minimum clearance fit, the small interference fit refers to that the interference fit between the protection ferrule 10 and the rotating shaft 1 is the minimum interference fit, these settings are for ensuring the radial fit precision between the protection ferrule 10 and the rotating shaft 1, and at the same time, the rotation shaft 1 and the protection ferrule 10 can be prevented from being jammed, and it is inconvenient to detach the protection ferrule 10 from the rotating shaft 1.

In this embodiment, lock nut 13 and the split type setting of protection lasso 10 can make functions between them part, can realize single function separately, have reduced the whole processing degree of difficulty of part, and can effectively guarantee the machining precision of protection lasso 10, can also reduce lock nut 13's screw-thread fit precision to can reduce the processing cost on the whole, improve machining efficiency.

In one embodiment, the rotating shaft 1 comprises a radial matching section 6, the first step 2 is positioned at a first end of the radial matching section 6, a second step 7 is arranged at a second end of the radial matching section 6, and the axial length of the protection ferrule 10 is greater than that of the radial matching section 6, so that the axial positioning effect of the lock nut 13 on the protection ferrule 10 can be ensured.

In one embodiment, the inner peripheral side of the protection ferrule 10 includes a positioning section and a threaded connection section, the rotating shaft 1 includes a radial fitting section 6, the first step 2 is located at a first end of the radial fitting section 6, a second step 7 is arranged at a second end of the radial fitting section 6, the positioning section is sleeved on the radial fitting section 6 and is in transition fit or interference fit with the radial fitting section 6, and the threaded connection section is fixed with a small diameter section of the second step 7 in a threaded manner. In this embodiment, the protection collar 10 and the lock nut 13 are of a unitary construction, forming a unitary protection collar 10.

In one embodiment, the protective bearing 3 cooperates with the sleeve 11 to form a radial protective structure. In this embodiment, the pivot protection architecture can be in the same place radial protection architecture and axial protection architecture integration to can shorten the axial length of pivot 1, reduce the amount of deflection of pivot 1, reduce the complete machine volume, reduce cost.

In this embodiment, the rotating shaft protection structure includes a rotating shaft 1, a protection bearing 3 and an axial protection baffle ring 4, the protection bearing 3 is directly or indirectly fixed to the housing, and may be a rolling bearing or a collar made of a wear-resistant material. The protective ring 10 is sleeved on the rotating shaft 1 of the rotor assembly, and a radial gap x formed between the cylindrical surface of the protective ring 10 and the protective bearing 3 is the minimum radial gap in the whole compressor, so that the magnetic suspension bearing, the motor or the impeller and the like are prevented from being collided and abraded with the stator, and a radial protection effect is achieved; a gap z is formed between the end face of the protection ring 10 and the step face of the first step of the rotor assembly, and the difference z-y between the gap z and the width y of the protection bearing 3 is the minimum axial gap in the integral compressor, so that the axial protection effect is achieved. The protective collar 10 abuts against the lock nut 13, the lock nut 13 is in threaded connection with the rotating shaft 1, and axial fixation is achieved through torque locking of the lock nut 13.

In this embodiment, one of the end surfaces of the protective bearing 3 can be axially limited by the first step 2, which is equivalent to reducing one assembly part, can reduce assembly precision errors caused by tolerance accumulation of the parts, and can reduce the number of the parts and reduce the part cost.

In one embodiment, the shape-changing groove 16 is provided on the inner cylindrical surface of the protection ferrule 10, the shape-changing groove 16 may be plural, the plural shape-changing grooves 16 are arranged at intervals along the axial direction of the protection ferrule 10, and the shape-changing groove 16 may also be a spiral groove extending along the axial direction of the inner cylindrical surface. The cross section of the deformation groove 10 can be in a V shape, and can also be in a rectangular shape, a semicircular shape, a semi-elliptical shape or a trapezoidal shape, when the rotor assembly falls to the protection collar 10, the protection collar 10 can elastically deform by using the deformation groove 16, so that part of impact energy is absorbed, and the effect of reducing the falling impact of the rotor is achieved.

In one embodiment, the protection ferrule 10 is a damping metal material, such as a Cu-Mn alloy, a Cu-Mn-Al alloy, an Al-Zn alloy, and a Mg-Zr alloy.

Compared with the prior art, the scheme has the advantages that the first step 2 of the rotating shaft 1 is utilized to form the axial stop, so that an assembly part for axial limiting can be reduced, and the problem of poor assembly precision caused by tolerance accumulation of the part is reduced. Meanwhile, the protection collar 10 is made of damping alloy material, and the inner peripheral surface is provided with the deformation groove 16, so that impact generated by falling of the rotor assembly can be effectively reduced, and the rotor assembly is protected.

According to an embodiment of the present application, the magnetic levitation compressor includes a rotation shaft protection structure, which is the above-mentioned rotation shaft protection structure.

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 pivot protection architecture, its characterized in that, includes rotor subassembly and protection bearing (3), the rotor subassembly includes pivot (1), the one end of pivot (1) has first step (2), protection bearing (3) cover is established in pivot (1), protection bearing (3) are kept away from one side of first step (2) is provided with axial backstop structure, protection bearing (3) axial is spacing first step (2) with between the axial backstop structure.

2. A spindle protection arrangement according to claim 1, characterized in that the axial stop comprises an axial protection retainer ring (4), and the axial protection retainer ring (4) is fixedly arranged on the side of the protection bearing (3) away from the first step (2).

3. A spindle protection arrangement according to claim 2, characterized in that the axial protection baffle ring (4) has an internal thread, the spindle (1) has an external thread, and the axial protection baffle ring (4) is screwed to the external thread of the spindle (1) via the internal thread.

4. A rotating shaft protection structure according to claim 3, wherein the axial protection baffle ring (4) is provided with a radial screw hole (5) in the radial direction, and the axial protection baffle ring (4) is axially positioned by a radial bolt provided in the radial screw hole (5).

5. A shaft protection structure according to claim 2, wherein the shaft (1) comprises a radial fitting section (6), the protection bearing (3) is sleeved on the radial fitting section (6) and is fitted with the radial fitting section (6) to form a radial protection structure, the first step (2) is located at a first end of the radial fitting section (6), and the axial stop structure is located at a second end of the radial fitting section (6).

6. A rotary shaft protection structure according to claim 5, wherein the second end of the radial matching section (6) is provided with a second step (7), the axial stopping structure comprises a radial outer axial extension section (8), a connecting section (9) and a radial inner axial extension section (14) which are sequentially arranged along the axial direction, the radial outer axial extension section (8) is sleeved outside the radial matching section (6) and is matched with the first step (2) to limit the axial displacement of the protection bearing (3), the connecting section (9) can be stopped on a step surface of the second step (7), and the radial inner axial extension section (14) is sleeved on a small diameter section of the second step (7) and is fixedly connected with the small diameter section.

7. A spindle protection arrangement according to any one of claims 1 to 6, characterized in that the protection bearing (3) is a rolling bearing or a collar of a wear resistant material support.

8. Pivot protection structure according to claim 5, characterised in that the second end of the radial fitting section (6) is provided with a second step (7), a clearance adjustment element (15) being provided between the axial stop and the second step (7), the clearance adjustment element (15) being able to adjust the axial clearance between the axial stop and the second step (7).

9. Pivot protection structure according to claim 8, characterised in that the gap adjustment element (15) is a metal rubber ring or a corrugated spring washer.

10. A magnetic levitation compressor comprising a rotation shaft protecting structure, wherein the rotation shaft protecting structure is the rotation shaft protecting structure of any one of claims 1 to 9.