CN109681526B

CN109681526B - Protective bearing device capable of adjusting bearing inner ring gap

Info

Publication number: CN109681526B
Application number: CN201910000859.5A
Authority: CN
Inventors: 俞成涛; 宋威; 孙月梅; 叶霞; 曹清林; 邱睿; 周金宇; 李秀莲; 丁凯
Original assignee: Jiangsu Institute of Technology
Current assignee: Jiangsu Institute of Technology
Priority date: 2019-01-02
Filing date: 2019-01-02
Publication date: 2020-03-17
Anticipated expiration: 2039-01-02
Also published as: CN109681526A

Abstract

The invention relates to a magnetic suspension bearing system, in particular to a protective bearing device capable of adjusting the clearance of a bearing inner ring. The method comprises the following steps: a rotor; the bearing seat is arranged at the end part of the rotor; the supporting assembly is rotatably arranged in the bearing seat through a first bearing, the supporting assembly is sleeved on the periphery of the rotor in a clearance mode, the supporting assembly comprises a supporting seat and at least two supporting pieces arranged in the supporting seat, the supporting pieces are arranged close to the rotor and can move radially relative to the supporting seat, and an opening is formed between each supporting piece and the corresponding supporting seat; the driving assembly is rotatably arranged in the bearing seat through the second bearing and comprises a driving seat and a driving piece movably arranged in the driving seat, the driving piece and the supporting piece are arranged in a one-to-one correspondence mode, the periphery of the rotor is sleeved with a gap of the driving seat, and the gap between the driving seat and the rotor is smaller than the gap between the supporting assembly and the rotor. The problem of protection device among the prior art can't be under the outage condition automatic protection rotor is solved.

Description

Protective bearing device capable of adjusting bearing inner ring gap

Technical Field

The invention relates to a magnetic suspension bearing system, in particular to a protective bearing device capable of adjusting the clearance of a bearing inner ring.

Background

When the magnetic suspension bearing system fails, the rotor loses the support and falls onto the stator, and the high-speed rotation can damage the system, so that a protection device capable of providing emergency support for the rotor in emergency situations such as power failure is needed. Therefore, the novel protection device capable of eliminating the bearing gap plays a crucial role in the development of the magnetic suspension bearing, but the novel protection bearing also faces a plurality of problems, for example, the structure is complex, and the novel protection device capable of eliminating the bearing gap can only adopt active control to work under the condition of power failure, so that the reliability of the novel protection device capable of eliminating the bearing gap is not high.

Disclosure of Invention

In order to solve the problem that a protection device in the prior art cannot automatically protect a rotor under the condition of power failure, the invention provides a protection bearing device capable of adjusting the clearance of a bearing inner ring, and the technical problem is solved. The technical scheme of the invention is as follows:

a protective bearing device capable of adjusting bearing inner ring clearance comprises: a rotor; a bearing housing disposed at an end of the rotor; the supporting assembly is rotatably arranged in the bearing seat through a first bearing, the supporting assembly is sleeved on the periphery of the rotor in a clearance mode, the supporting assembly comprises at least two supporting pieces and a supporting piece, the supporting pieces are arranged in the supporting seat, the supporting pieces are arranged close to the rotor and can move radially relative to the supporting seat, and an opening is formed between each supporting piece and the corresponding supporting seat; the driving assembly is rotatably arranged in the bearing seat through a second bearing and comprises a driving seat and a driving piece movably arranged in the driving seat, the driving piece and the supporting piece are arranged in a one-to-one correspondence manner, the driving seat is sleeved on the periphery of the rotor in a clearance manner, and the clearance between the driving seat and the rotor is smaller than the clearance between the supporting assembly and the rotor; the rotor drives the driving piece to rotate by driving the driving seat, and when the driving piece rotates to the opening position, the driving piece is inserted into the opening under the action of the elastic piece to push the supporting piece to approach and support the rotor.

Through the structure of reasonable setting protection bearing device, under the condition that has a power failure or has an accident, the rotor drops from former track, because the clearance between drive seat and the rotor is less than the clearance between supporting piece and the first bearing outer lane, therefore, the rotor is prior to the contact of drive seat, drive the drive seat and rotate, when the drive seat drives the driving piece on it and moves to the open position, the driving piece inserts in the opening and promotes the supporting piece and radially move towards the rotor under the effect of elastic component, until the periphery contact with the rotor, two at least supporting pieces can pass through the supporting rotor, make the rotor arranged in central department, no longer contact between rotor and the drive seat, because the existence of first bearing, the rotor can drive the supporting component and rotate and slowly stop for a period of time, play the fine guard action to the rotor.

Further, the bearing assembly further comprises an elastic reset piece, and the elastic reset piece provides a radial outward acting force for the bearing piece.

Further, still include the mount pad, the mount pad is the form of buckling, one end of mount pad extends to the radial inboard of at least part of supporter, supporter and mount pad spacing jointly elasticity piece that resets.

Further, the opening is wedge-shaped, and the inner diameter of one end of the opening close to the driving assembly is larger than that of the other end of the opening.

Furthermore, the driving seat is internally provided with a mounting hole, the driving piece is arranged in the mounting hole in a sliding manner, the axis of the driving piece is parallel to the axis of the rotor, the driving piece is sleeved with an elastic piece, and the elastic piece provides acting force towards the supporting assembly along the axis of the driving piece.

Furthermore, one side of the driving seat, which is far away from the supporting assembly, is fixedly connected with a driving baffle, the driving piece penetrates through the baffle and is arranged in the mounting hole, a limiting block extends on the outer wall of the driving piece, one end of the elastic piece abuts against the limiting block, and the other end of the elastic piece abuts against the baffle.

Furthermore, one end of the driving piece, which faces the supporting assembly, is spherical or wedge-shaped, and one end of the driving piece, which is far away from the supporting assembly, extends out of the driving seat and is provided with a limiting piece.

Furthermore, the pull rod is arranged on one side, away from the supporting component, of the driving component, and one end, away from the supporting component, of the driving component penetrates through the pull rod to be connected with the limiting component.

Further, the bearing assembly and the drive assembly are axially spaced apart.

Furthermore, the number of the driving parts and the number of the supporting parts are 4, 4 driving parts are uniformly distributed on the driving seat, and 4 supporting parts are uniformly distributed on the supporting seat.

Based on the technical scheme, the invention can realize the following technical effects:

1. the protective bearing device capable of adjusting the clearance of the bearing inner ring has the advantages that through reasonably arranging the structure of the protective bearing device, under the condition of power failure or accident, the rotor falls off from the original track, and because the clearance between the driving seat and the rotor is smaller than the clearance between the supporting piece and the outer ring of the first bearing, the rotor firstly contacts with the driving seat to drive the driving seat to rotate, when the driving seat drives the driving piece on the driving seat to move to the opening position, the driving piece is inserted into the opening under the action of the elastic piece to push the supporting pieces to move radially towards the rotor until the supporting pieces are contacted with the periphery of the rotor, at least two supporting pieces can support the rotor so that the rotor is placed at the center, the rotor is not contacted with the driving seat, due to the existence of the first bearing, the rotor can drive the supporting component to rotate for a period of time and stop slowly, so that the rotor is well protected;

2. according to the bearing protection device capable of adjusting the bearing inner ring gap, the driving piece is arranged to extend into the wedge-shaped opening between the supporting piece and the supporting seat to push the supporting piece to move towards the rotor relative to the supporting seat, so that the inner peripheral surface of the supporting piece is in contact with the rotor, the shape of the opening is reasonably arranged, the driving piece pushes the supporting piece gradually, and collision damage cannot occur between the supporting piece and the rotor;

3. according to the protective bearing device capable of adjusting the bearing inner ring gap, the elastic reset piece is arranged to provide a radial outward acting force for the supporting piece, when a rotor needs to be supported, the driving piece extends into the opening, and the supporting piece is pushed to overcome the acting force of the elastic reset piece to move radially; when the rotor is not required to be supported, the driving piece exits from the opening, the supporting piece is reset under the action of the elastic resetting piece, a gap exists between the supporting piece and the rotor, and the supporting piece does not influence the normal operation of the rotor and plays a role in automatic resetting;

4. according to the protective bearing device capable of adjusting the bearing inner ring gap, the elastic piece is arranged, so that when the driving piece rotates to the opening position, the driving piece is inserted into the opening under the action of the elastic piece to push the supporting piece to move radially; when the supporting is not needed, the pull rod is pulled outwards to drive the driving piece to exit from the opening, the supporting piece is automatically far away from the rotor, and the rotor can rotate freely.

Drawings

FIG. 1 is a schematic structural view of a protective bearing device capable of adjusting the clearance of a bearing inner ring according to the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 2;

FIG. 4 is an enlarged view of section C of FIG. 2;

FIG. 5 is an enlarged view of section D of FIG. 2;

in the figure: 1-a rotor; 2-a support assembly; 21-a supporting seat; 22-a support; 23-an elastic return member; 24-a mounting seat; 3-a drive assembly; 31-a drive seat; 32-a drive member; 321-a limiting block; 322-a stop; 33-an elastic member; 34-driving the baffle; 4-bearing seats; 5-a first bearing; 6-a second bearing; 7-end cap; 8-a pull rod; 9-a support baffle; 10-a retainer ring.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

As shown in fig. 1-5, the embodiment provides a protective bearing device capable of adjusting a bearing inner ring gap, which includes a rotor 1, a supporting assembly 2, a driving assembly 3, and a bearing seat 4, where the bearing seat 4 is disposed at an end of the rotor 1, and specifically, the bearing seat 4 is sleeved at an end periphery of the rotor 1 with a gap; the supporting component 2 is rotatably arranged in the bearing seat 4, and the supporting component 2 is sleeved on the periphery of the rotor 1 in a clearance way; the driving component 3 is rotatably arranged in the bearing seat 4, and the driving component 3 is sleeved on the periphery of the rotor 1 in a clearance way. The clearance between the inner peripheral surface of the driving component 3 and the rotor 1 is smaller than the clearance between the inner peripheral surface of the supporting component 2 and the rotor 1, under the condition of power failure or fault, the rotor 1 is separated from the original working track and is firstly contacted with the inner peripheral surface of the driving component 3 to drive the driving component 3 to rotate, the driving component 3 pushes the supporting component 2 to radially move towards the rotor 1 after rotating for a certain angle until being contacted with the rotor 1, and the supporting component 2 supports the rotor 1 and rotates along with the rotor 1 until the rotor 1 stops rotating.

The support assembly 2 is rotatably disposed in the bearing seat 4 through a first bearing 5, specifically, the outer circumferential surface of the support assembly 2 is fixedly connected with the inner ring of the first bearing 5, and the outer ring of the first bearing 5 is fixedly connected with the bearing seat 4. Preferably, the first bearing 5 is a rolling bearing.

The bearing assembly 2 comprises a bearing seat 21, a bearing part 22, an elastic reset part 23 and a mounting seat 24, wherein the bearing seat 21 is annular, an inner ring of the bearing seat 21 is provided with a notch for mounting the bearing part 22, the bearing part 22 is arranged close to the rotor 1, the inner ring of the bearing seat 21 and the inner surface of the bearing part 22 are arranged in a clearance mode with the rotor 1, the bearing part 22 can move radially relative to the bearing seat 21, and the elastic reset part 23 provides a radially outward acting force for the bearing part 22. In particular, the support 22 is mounted in a notch of the support seat 21, the support 22 being at least partially abutted against the support seat 21 by the elastic return member 23. Preferably, the support element 22 is under the action of the elastic return element 23, the inner end outer surface of the support element 22 abuts against the support seat 21, and an opening is present between the outer end outer surface of the support element 22 and the support seat 21, so that the drive assembly 3 can be inserted into the opening to push the support element 22 towards the rotor 1. It is further preferred that the opening is wedge-shaped, with the inner diameter of the opening at one end near the drive assembly 3 being larger than the inner diameter at the other end.

The elastic resetting piece 23 is installed in the supporting seat 21 through a mounting seat 24 and provides acting force for the supporting piece 22, the mounting seat 24 is arranged on the other side of the supporting seat 21 far away from the driving assembly 3, the mounting seat 24 is fixedly connected with the supporting seat 21, the mounting seat 24 is bent, one end of the mounting seat 24 extends to the radial inner side of at least part of the supporting piece 22, and the elastic resetting piece 23 is located between the supporting piece 22 and the mounting seat 24. In this embodiment, the cross section of the mounting seat 24 is L-shaped, one end of the mounting seat 24 is fixedly connected to the supporting seat 21, and the other end of the mounting seat 24 extends to the radial inner side of the inner end of the supporting member 22, and the shapes of the supporting member 22 and the mounting seat 24 are reasonably set, so that the inner surface of the supporting member 22 and the inner surface of the supporting seat 21 are located on the same cylindrical surface, and the inner surface of the mounting seat 24 close to the rotor 1 and the inner surface of the supporting seat 21 are also located on the same cylindrical surface without the action of the driving assembly 3. Preferably, the elastic return member 23 is selected from, but not limited to, a spring.

Preferably, there are at least two support members 22, at least two support members 22 are evenly distributed on the support base 21, and at least two support members 22 extend out of the support base 21 to center the rotor 1. The number of the supporting members 22 is 4 in this embodiment.

As another embodiment of the bearing assembly 2, the bearing block 21 and the mounting block 24 may be integrally formed.

The outer end of the supporting component 2 close to the driving component 3 is also fixedly connected with a supporting baffle 9, specifically, the supporting baffle 9 is circular, the periphery of the rotor 1 is sleeved with a gap, the supporting baffle 9 is fixedly connected with a supporting seat 21, and a hole is formed in the overlapping position of the supporting baffle 9 and the supporting part 22, so that the driving component 3 can conveniently penetrate through the supporting baffle 9 and act on the supporting component 2. The radial outer end of the supporting baffle 9 and the radial outer end of the mounting seat 24 are matched with the peripheral surface of the supporting seat 21 to form a groove, and the inner ring of the first bearing 5 is locked together.

The driving assembly 3 is rotatably mounted in the bearing seat 4 through a second bearing 6, specifically, the outer circumferential surface of the driving assembly 3 is fixedly connected with the inner ring of the second bearing 6, and the outer ring of the second bearing 6 is fixedly connected with the bearing seat 4. Preferably, the second bearing 6 is a rolling bearing.

The driving assembly 3 comprises a driving seat 31, a driving part 32 and an elastic part 33, the driving seat 31 is annular, the driving seat 31 is sleeved on the periphery of the rotor 1 with a gap, a mounting hole is formed in the driving seat 31 for mounting the driving part 32, and preferably, the axis of the mounting hole is parallel to the axis of the rotor 1. The driving member 32 is installed in the installation hole and can slide along the direction of the installation hole, and the driving member 32 is sleeved with an elastic member 33, and the elastic member 33 provides a force for the driving member 32 to move towards the supporting assembly 2. Specifically, a stopper 321 extends from the outer peripheral surface of the driving member 32, and when the driving member 32 does not act on the support assembly 2, the stopper 321 is located in the mounting hole. The elastic member 33 can be installed by providing a stepped hole in the installation hole, abutting one end of the elastic member 33 in the installation hole, and abutting the other end of the elastic member 33 on the limiting member 321. In this embodiment, in order to facilitate disassembly and assembly, a driving baffle 34 is fixedly connected to one side of the driving seat 31, which is far away from the supporting assembly, the mounting hole is a circular hole with a uniform inner diameter, one end of the elastic element 33 abuts against the driving baffle 34, and the other end abuts against the limiting element 321. Preferably, the driving members 32 are pin rods, and the end of the driving members 32 facing the support assembly 2 is wedge-shaped or spherical, and the extendable mounting holes protrude into the openings, gradually pushing the support members 22 to move radially towards the rotor 1, and finally supporting the rotor 1. The other end of the driving member 32 extends out of the mounting hole and is provided with a limiting member 322, and the depth of the driving member 32 extending into the opening is limited by the limiting member 322. Preferably, the elastic member 33 may be selected from, but not limited to, a spring. Preferably, the drive members 32 are disposed in a one-to-one correspondence with the support members 22.

Further, the shapes of the radial outer ends of the driving baffle 34 and the driving seat 31 are reasonably arranged to form a groove for locking the outer ring of the second bearing 6, so that subsequent disassembly and connection are facilitated.

The device further comprises a pull rod 8, the pull rod 8 is arranged on one side of the driving assembly 3 far away from the supporting assembly 2, one end of the driving element 32 far away from the supporting assembly 2 penetrates through the pull rod 8, one end of the driving element 32 penetrating through the pull rod 8 is provided with a limiting element 322, and the driving element 32 can be driven to move by pulling the pull rod 8. Preferably, the tie rod 8 is an annular tie rod.

Further, in order not to interfere with the normal operation between the support assembly 2 and the drive assembly 3, the support assembly 2 and the drive assembly 3 are spaced apart. Specifically, the support assembly 2 and the drive assembly 3 are spaced apart by a retaining ring 10. Specifically, the retainer ring 10 is compressed between the outer ring of the first bearing 5 and the outer ring of the second bearing 6, and the thickness of the retainer ring 10 is set reasonably, so that the support assembly 2 and the drive assembly 3 are arranged at intervals.

In order to install the supporting component 2 and the driving component 3, the protective bearing device further comprises an end cover 7, the shape of the inner circumferential surface of the bearing seat 4 is reasonably set, grooves for tightly clamping the outer rings of the first bearing 5 and the second bearing 6 are formed in the inner circumferential surfaces of the end cover 7 and the bearing seat 4, the end cover 7 is fixedly connected with the bearing seat 4 and tightly presses the first bearing 5 and the second bearing 6, and therefore, in the installation process, the use of fixing pieces such as screws and the like can be reduced, and the subsequent disassembly is convenient.

Based on the above structure, the working principle of the protective bearing device capable of adjusting the bearing inner ring gap of the embodiment is as follows: assuming an initial state in which the magnetic bearing system is not powered, in which the driving member 32 extends into the opening to push the supporting members 22 radially towards the rotor 1, at least two supporting members 22 support the rotor 1 centrally.

In the working state, the pull rod 8 is pulled to enable the driving piece 32 to be separated from the opening, the driving piece 32 is abutted against the supporting baffle 9, the supporting piece 22 is far away from the rotor 1 under the action of the elastic resetting piece 23, gaps exist between the supporting assembly 2 and the driving assembly 3 and the rotor 1, and the rotor 1 can rotate at a high speed.

Under the condition of system outage or failure, the rotor 1 loses magnetic suspension acting force, the rotor 1 continues to rotate under the action of inertia, as the gap between the driving assembly 3 and the rotor 1 is smaller than the gap between the supporting assembly 2 and the rotor 1, the rotor 1 is firstly contacted with the driving seat 31 of the driving assembly 3 and drives the driving seat 31 to rotate, the driving seat 31 drives the driving piece 32 thereon to rotate, when the driving piece 32 rotates to the opening, the driving piece 32 extends into the opening to push the supporting piece 22 to move radially towards the rotor 1, and the at least two supporting pieces 22 support the rotor 1 in the center.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A protective bearing device capable of adjusting bearing inner ring clearance is characterized by comprising:

a rotor (1);

a bearing seat (4), wherein the bearing seat (4) is arranged at the end part of the rotor (1);

the supporting assembly (2) is rotatably arranged in a bearing seat (4) through a first bearing (5), the supporting assembly (2) is sleeved on the periphery of the rotor (1) in a clearance mode, the supporting assembly (2) comprises a supporting seat (21) and supporting pieces (22) installed in the supporting seat (21), at least two supporting pieces (22) are arranged, the supporting pieces (22) are arranged close to the rotor (1) and can move radially relative to the supporting seat (21), and an opening is formed between each supporting piece (22) and the corresponding supporting seat (21);

the driving assembly (3) is rotatably arranged in the bearing seat (4) through a second bearing (6), the driving assembly (3) comprises a driving seat (31) and driving pieces (32) movably arranged in the driving seat (31), the driving pieces (32) and the supporting pieces (22) are arranged in a one-to-one correspondence manner, the driving seat (31) is sleeved on the periphery of the rotor (1) in a clearance manner, and the clearance between the driving seat (31) and the rotor (1) is smaller than the clearance between the supporting assembly (2) and the rotor (1);

the rotor (1) drives the driving seat (31) to rotate so as to drive the driving piece (32) to rotate, and when the driving piece (32) rotates to the opening position, the driving piece (32) is inserted into the opening under the action of the elastic piece (33) to push the supporting piece (22) to approach and support the rotor (1).

2. A protective bearing device with adjustable bearing inner race clearance according to claim 1, characterized in that the bearing assembly (2) further comprises a resilient return member (23), the resilient return member (23) providing a radially outward force to the bearing member (22).

3. A bearing inner race clearance adjustable protection bearing device according to claim 2, further comprising a mounting seat (24), wherein the mounting seat (24) is bent, one end of the mounting seat (24) extends to a radial inner side of at least a part of the supporting member (22), and the supporting member (22) and the mounting seat (24) jointly limit the elastic restoring member (23).

4. A protective bearing device with adjustable bearing inner race clearance according to claim 3 characterized in that the opening is wedge shaped with the inside diameter of the opening at one end near the drive assembly (3) being larger than the inside diameter at the other end.

5. A bearing protector for adjusting bearing inner race clearance according to any one of claims 1-4 characterized in that the driving seat (31) has a mounting hole formed therein, the driving member (32) is slidably disposed in the mounting hole, the axis of the driving member (32) is parallel to the axis of the rotor (1), the driving member (32) is sleeved with a resilient member (33), and the resilient member (33) provides the driving member (32) with a force along its axis toward the bearing assembly (2).

6. A bearing protector with adjustable bearing inner race clearance according to claim 5, characterized in that a driving baffle (34) is fixedly connected to the side of the driving seat (31) far away from the support assembly (2), the driving member (32) is arranged in the mounting hole through the baffle (34), a stopper (321) extends from the outer wall of the driving member (32), one end of the elastic member (33) abuts against the stopper (321), and the other end of the elastic member (33) abuts against the driving baffle (34).

7. A bearing protector for adjusting bearing inner race clearance according to claim 5 characterized in that the end of the driving member (32) facing the bearing assembly (2) is spherical or wedge-shaped, and the end of the driving member (32) facing away from the bearing assembly (2) extends out of the driving seat (31) and is provided with a limit stop (322).

8. The adjustable bearing inner race clearance protection bearing device as claimed in claim 7, further comprising a pull rod (8), wherein the pull rod (8) is located on a side of the driving assembly (3) away from the supporting assembly (2), and an end of the driving member (32) away from the supporting assembly (2) passes through the pull rod (8) and is connected with the stopper (322).

9. A protective bearing device with adjustable bearing inner race clearance according to any one of claims 1-4 and 6-8, characterized in that the support assembly (2) and the drive assembly (3) are axially spaced apart.

10. A protective bearing device with adjustable bearing inner race clearance according to claim 9, characterized in that said drive members (32) and said support members (22) are each 4, 4 of said drive members (32) being evenly distributed on said drive seat (31) and 4 of said support members (22) being evenly distributed on said support seat (21).