A self-recovering enhanced magnetic liquid sealing device

Abstract

The present invention relates to a self-restoring enhanced magnetic liquid sealing device. It primarily addresses the technical problem of poor stability in existing magnetic liquid seals. The technical solution of the present invention is: a self-restoring enhanced magnetic liquid sealing device comprising a rotating shaft, an end cover, an elastic retaining ring, a magnetic seal, a spherical roller bearing, a housing, and a plurality of bolts. The spherical roller bearing is mounted on a bearing neck provided on the rotating shaft, and its inner ring end face is pressed against the shaft shoulder of the rotating shaft. The magnetic seal is mounted on the rotating shaft and pressed against one side of the spherical roller bearing. The elastic retaining ring is mounted in a positioning groove of the rotating shaft and axially fixes the magnetic seal. The rotating shaft, the spherical roller bearing, and the magnetic seal are disposed together in a sealed cavity provided in the housing. The end cover is connected to the housing via the bolts and fixes the magnetic seal in the sealed cavity. The present invention has the advantages of strong self-restoring ability and good magnetic liquid sealing stability.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical engineering lubrication, and in particular relates to a self-recovery enhanced magnetic liquid sealing device. Background Art

[0002] Magnetic fluid seals are a new sealing technology characterized by strong adaptability, good controllability, and high reliability, and have broad application prospects in aerospace, medical and chemical industries, electronic energy, and other fields. However, when the magnetic fluid at the pole piece and pole teeth is subjected to a sealing pressure differential, the magnetic fluid is easily squeezed to the side of the pole teeth, causing the magnetic fluid sealing membrane to rupture. The membrane then slowly recovers to its original state under the influence of the magnetic field, seriously affecting the stability of the magnetic fluid seal. Summary of the Invention

[0003] The purpose of the present invention is to solve the technical problem of poor stability of existing magnetic liquid seals and to provide a self-recovery enhanced magnetic liquid sealing device, which can improve the stability of the magnetic liquid seal.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A self-restoring enhanced magnetic liquid sealing device includes a rotating shaft, an end cover, an elastic retaining ring, a magnetic sealing body, a spherical roller bearing, a housing and several bolts. The spherical roller bearing is mounted on a bearing neck provided on the rotating shaft and its inner ring end face is pressed tightly against the shaft shoulder of the rotating shaft. The magnetic sealing body is mounted on the rotating shaft and pressed tightly against one side of the spherical roller bearing. The elastic retaining ring is mounted in a positioning groove of the rotating shaft and axially fixes the magnetic sealing body. The rotating shaft, the spherical roller bearing and the magnetic sealing body are arranged together in a sealing cavity provided in the housing. The end cover is connected to the housing via the bolts and fixes the magnetic sealing body in the sealing cavity.

[0006] Furthermore, the magnetic seal is composed of a left gasket, a first pole shoe, a second pole shoe, a first permanent magnet, a second permanent magnet, a third permanent magnet, a fourth permanent magnet, a right magnetic isolation ring, a right gasket, a right stopper, a left stopper, a magnetic liquid and a left magnetic isolation ring; the first pole shoe and the second pole shoe are interference-mounted on the inner wall of the shell sealing cavity along the axial interval, the first permanent magnet is arranged between the first pole shoe and the second pole shoe, the right magnetic isolation ring and the left magnetic isolation ring are arranged on the inner wall of the shell sealing cavity, the left end face of the first pole shoe is tightly attached to the right end face of the left magnetic isolation ring, the left end face of the left magnetic isolation ring is tightly attached to the end cover, the right end face of the second pole shoe is tightly attached to the left end face of the right magnetic isolation ring, and the right end face of the right magnetic isolation ring is tightly attached to the outer ring of the spherical roller bearing; The right stopper and the left stopper are axially spaced and sleeved on the rotating shaft and correspond to the first pole shoe and the second pole shoe. The second permanent magnet is sleeved on the rotating shaft and located between the right stopper and the left stopper. The inner circumference of the second permanent magnet fits the outer circumference of the rotating shaft. The right washer is provided on the rotating shaft and located between the right stopper and the inner ring of the spherical roller bearing. The third permanent magnet is sleeved on the small diameter outer circumferential surface of the right washer and located on the right side of the right stopper. The left washer is provided on the rotating shaft and located between the left stopper and the elastic retaining ring. The fourth permanent magnet is sleeved on the small diameter outer circumferential surface of the left washer and located on the left side of the left stopper. The magnetic liquid is provided in the gap formed by the first pole shoe, the second pole shoe and the right stopper and the left stopper. Under the action of the magnetic field, the magnetic liquid is adsorbed to the bottom of the pole shoe pole teeth to produce a sealing effect.

[0007] Furthermore, the first permanent magnet is magnetized in the axial direction; the magnetization direction of the second permanent magnet is opposite to that of the first permanent magnet; and the magnetization direction of the third permanent magnet and the fourth permanent magnet is the same as that of the first permanent magnet.

[0008] Furthermore, the left washer and the right washer are both stepped circular rings, and the left washer and the right washer are made of non-magnetic material.

[0009] Furthermore, the magnetic sealing body also includes a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring; the first sealing ring and the second sealing ring are respectively arranged in the sealing grooves arranged on the outer circumferences of the first pole shoe and the second pole shoe; the third sealing ring and the fourth sealing ring are respectively arranged in the sealing grooves arranged on the inner circumferences of the right stopper and the left stopper.

[0010] The beneficial effects of the present invention are:

[0011] In the technical solution adopted by the present invention, a mutually repulsive magnetic field is formed between the third permanent magnet and the second permanent magnet, causing the magnetic liquid below the pole teeth of the second pole shoe to be subjected to an axial restoring force directed toward its initial position under the sealing pressure differential, thereby improving the sealing stability of the magnetic liquid. Similarly, a mutually repulsive magnetic field is also formed between the fourth permanent magnet and the second permanent magnet, causing the magnetic liquid below the first pole shoe to be subjected to an axial restoring force directed toward its initial position under the sealing pressure differential. This enhances the magnetic liquid at the pole teeth's ability to resist deformation under the sealing pressure differential and its ability to self-recover after deformation, improving the magnetic liquid's sealing stability and resolving the technical problem of poor stability associated with existing magnetic liquid seals. Therefore, compared with the prior art, the present invention offers advantages such as strong self-recovery and excellent magnetic liquid sealing stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 yes Figure 1 A magnified view of part A in FIG;

[0014] In the figure: 1-rotating shaft; 2-end cover; 3-elastic retaining ring; 4-left washer; 5-1-first pole shoe; 5-2-second pole shoe; 6-1-first permanent magnet; 6-2-second permanent magnet; 6-3-third permanent magnet; 6-4-fourth permanent magnet; 7-right magnetic isolation ring; 8-spherical roller bearing; 9-housing; 10-right washer; 11-1-right stopper; 11-2-left stopper; 12-magnetic liquid; 13-left magnetic isolation ring; 14-bolt; 15-1-first sealing ring; 15-2-second sealing ring; 15-3-third sealing ring; 15-4-fourth sealing ring; 16-dust ring. DETAILED DESCRIPTION

[0015] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0016] like Figure 1 and Figure 2As shown, a self-restoring enhanced magnetic liquid sealing device in this embodiment includes a rotating shaft 1, an end cover 2, an elastic retaining ring 3, a magnetic seal, a spherical roller bearing 8, a housing 9, and several bolts 14. The spherical roller bearing 8 is mounted on a bearing journal provided on the rotating shaft 1, with its inner ring end face pressed against a shaft shoulder of the rotating shaft 1. The magnetic seal is mounted on the rotating shaft 1 and pressed against one side of the spherical roller bearing 8. The elastic retaining ring 3 is mounted in a positioning groove of the rotating shaft 1 and axially fixes the magnetic seal. The rotating shaft 1, the spherical roller bearing 8, and the magnetic seal are disposed together within a sealed cavity provided in the housing 9. The end cover 2 is connected to the housing 9 via the bolts 14 and secures the magnetic seal within the sealed cavity. A sealing groove is provided on the inner circumferential surface of the shaft hole of the end cover 2. A dust ring 16 is disposed within the sealing groove, and the inner circumferential surface of the dust ring 16 is in contact with the outer circumferential surface of the rotating shaft 1.

[0017] The magnetic seal is composed of a left washer 4, a first pole shoe 5-1, a second pole shoe 5-2, a first permanent magnet 6-1, a second permanent magnet 6-2, a third permanent magnet 6-3, a fourth permanent magnet 6-4, a right magnetic isolation ring 7, a right washer 10, a right stopper 11-1, a left stopper 11-2, a magnetic liquid 12 and a left magnetic isolation ring 13; the first pole shoe 5-1 and the second pole shoe 5-2 are interference-mounted on the inner wall of the sealed cavity of the shell 9 along the axial direction, and the first permanent magnet 6-1 is arranged on the Between the first pole shoe 5-1 and the second pole shoe 5-2, the right magnetic isolation ring 7 and the left magnetic isolation ring 13 are arranged on the inner wall of the sealed cavity of the shell 9, the left end face of the first pole shoe 5-1 is tightly attached to the right end face of the left magnetic isolation ring 13, the left end face of the left magnetic isolation ring 13 is tightly attached to the end cover 2, the right end face of the second pole shoe 5-2 is tightly attached to the left end face of the right magnetic isolation ring 7, and the right end face of the right magnetic isolation ring 7 is tightly attached to the outer ring of the spherical roller bearing 8; the right stopper 11-1 and The left stopper 11-2 is sleeved on the rotating shaft 1 along the axial interval and corresponds to the first pole shoe 5-1 and the second pole shoe 5-2. The second permanent magnet 6-2 is sleeved on the rotating shaft 1 and is located between the right stopper 11-1 and the left stopper 11-2. The inner circumference of the second permanent magnet 6-2 fits the outer circumference of the rotating shaft 1. The right washer 10 is provided on the rotating shaft 1 and is located between the right stopper 11-1 and the inner ring of the spherical roller bearing 8. The third permanent magnet 6-3 is sleeved on the right washer 10. The left washer 4 is arranged on the rotating shaft 1 and is located between the left stopper 11-2 and the elastic retaining ring 3. The fourth permanent magnet 6-4 is mounted on the small diameter outer surface of the left washer 4 and is located on the left side of the left stopper 11-2. The magnetic liquid 12 is arranged in the gap formed by the first pole shoe 5-1, the second pole shoe 5-2 and the right stopper 11-1 and the left stopper 11-2. The magnetic liquid 12 is adsorbed to the bottom of the pole shoe pole teeth under the action of the magnetic field to produce a sealing effect.

[0018] The first permanent magnet 6-1 is magnetized in the axial direction; the magnetization direction of the second permanent magnet 6-2 is opposite to that of the first permanent magnet 6-1; the magnetization direction of the third permanent magnet 6-3 and the fourth permanent magnet 6-4 is the same as that of the first permanent magnet 6-1.

[0019] The left washer 4 and the right washer 10 are both stepped circular rings, and the left washer 4 and the right washer 10 are made of non-magnetic material.

[0020] The left magnetic isolation ring 13 and the right magnetic isolation ring 7 are made of non-magnetic materials. The elastic retaining ring 3 is made of non-magnetic materials.

[0021] The magnetic sealing body also includes a first sealing ring 15-1, a second sealing ring 15-2, a third sealing ring 15-3 and a fourth sealing ring 15-4; the first sealing ring 15-1 and the second sealing ring 15-2 are respectively arranged in the sealing grooves provided on the outer peripheral surfaces of the first pole shoe 5-1 and the second pole shoe 5-2; the third sealing ring 15-3 and the fourth sealing ring 15-4 are respectively arranged in the sealing grooves provided on the inner peripheral surfaces of the right stopper 11-1 and the left stopper 11-2.

Claims

1. A self-recovering enhanced magnetic liquid sealing device, characterized in that: The invention comprises a rotating shaft (1), an end cover (2), an elastic retaining ring (3), a magnetic seal, a spherical roller bearing (8), a housing (9) and a plurality of bolts (14); the spherical roller bearing (8) is mounted on a bearing neck provided on the rotating shaft (1) and the inner ring end face thereof is pressed against the shaft shoulder of the rotating shaft (1); the magnetic seal is mounted on the rotating shaft (1) and pressed against one side of the spherical roller bearing (8); the elastic retaining ring (3) is mounted in a positioning groove of the rotating shaft (1) and fixes the magnetic seal axially; the rotating shaft (1), the spherical roller bearing (8) and the magnetic seal are arranged together in a sealing cavity provided in the housing (9); the end cover (2) is connected to the housing (9) through the bolts (14) and fixes the magnetic seal in the sealing cavity; The magnetic seal comprises a left washer (4), a first pole shoe (5-1), a second pole shoe (5-2), a first permanent magnet (6-1), a second permanent magnet (6-2), a third permanent magnet (6-3), a fourth permanent magnet (6-4), a right magnetic isolation ring (7), a right washer (10), a right stopper (11-1), a left stopper (11-2), a magnetic liquid (12) and a left magnetic isolation ring (13); the first pole shoe (5-1) and the second pole shoe (5-2) are interference-mounted on the inner wall of the sealed cavity of the housing (9) at intervals along the axial direction, the first permanent magnet (6-1) is arranged between the first pole shoe (5-1) and the second pole shoe (5-2), and the right magnetic isolation ring (7) and the left magnetic isolation ring (13) are arranged on the inner wall of the sealed cavity of the housing (9). The second permanent magnet (6-2) is sleeved on the rotating shaft (1) and is located between the right stopper (11-1) and the left stopper (11-2), and the inner circumference of the second permanent magnet (6-2) is in contact with the outer circumference of the rotating shaft (1); the third permanent magnet (6-3) is sleeved on the small-diameter outer circumference of the right washer (10) and is located on the right side of the right stopper (11-1); the fourth permanent magnet (6-4) is sleeved on the small-diameter outer circumference of the left washer (4) and is located on the left side of the left stopper (11-2); the magnetic liquid (12) is provided in a gap formed by the first pole shoe (5-1), the second pole shoe (5-2) and the right stopper (11-1) and the left stopper (11-2); the magnetic liquid (12) is adsorbed to the bottom of the pole shoe pole teeth under the action of the magnetic field to produce a sealing effect; The first permanent magnet (6-1) is magnetized in the axial direction; the magnetization direction of the second permanent magnet (6-2) is opposite to that of the first permanent magnet (6-1); and the magnetization direction of the third permanent magnet (6-3) and the fourth permanent magnet (6-4) is the same as that of the first permanent magnet (6-1).

2. A self-recovering enhanced magnetic liquid sealing device according to claim 1, characterized in that: The left end face of the first pole shoe (5-1) is in close contact with the right end face of the left magnetic isolation ring (13), the left end face of the left magnetic isolation ring (13) is in close contact with the end cover (2), the right end face of the second pole shoe (5-2) is in close contact with the left end face of the right magnetic isolation ring (7), and the right end face of the right magnetic isolation ring (7) is in close contact with the outer ring of the spherical roller bearing (8); the right stopper (11-1) and the left stopper (11-2) are axially spaced and mounted on the rotating shaft (1) and correspond to the first pole shoe (5-1) and the second pole shoe (5-2); the right washer (10) is provided on the rotating shaft (1) and is located between the right stopper (11-1) and the inner ring of the spherical roller bearing (8), and the left washer (4) is provided on the rotating shaft (1) and is located between the left stopper (11-2) and the elastic retaining ring (3).

3. The self-recovering enhanced magnetic liquid sealing device according to claim 2, characterized in that: The left washer (4) and the right washer (10) are both stepped circular rings, and the left washer (4) and the right washer (10) are made of non-magnetic conductive material.

4. A self-recovering enhanced magnetic liquid sealing device according to claim 1 or 2, characterized in that: The magnetic sealing body further comprises a first sealing ring (15-1), a second sealing ring (15-2), a third sealing ring (15-3) and a fourth sealing ring (15-4); the first sealing ring (15-1) and the second sealing ring (15-2) are respectively arranged in sealing grooves arranged on the outer circumferences of the first pole shoe (5-1) and the second pole shoe (5-2); the third sealing ring (15-3) and the fourth sealing ring (15-4) are respectively arranged in sealing grooves arranged on the inner circumferences of the right stopper (11-1) and the left stopper (11-2).

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