Magnetic liquid seal device with improved pressure resistance

Abstract

The application belongs to the technical field of mechanical sealing device, and particularly relates to a magnetic liquid sealing device for improving sealing pressure resistance. The magnetic liquid sealing device is mainly used to solve the technical problem that the existing magnetic liquid sealing device has low sealing pressure resistance under the conditions of high speed, large shaft diameter and large gap sealing, and cannot meet the requirement of high sealing pressure resistance. The technical scheme of the application is as follows: a magnetic liquid sealing device for improving sealing pressure resistance, which comprises a shell, a rotating shaft, an end cover, a first permanent magnet and two pole shoes, and further comprises a second permanent magnet and a stop block. The second permanent magnet is installed below the first permanent magnet through the stop block, and the magnetization direction of the second permanent magnet is opposite to that of the first permanent magnet. The application has the advantages of high sealing pressure resistance, wide application range, compact structure, convenient use and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical sealing devices, and particularly relates to a magnetic liquid sealing device for improving sealing pressure resistance. BACKGROUND

[0002] Compared with traditional mechanical sealing, the magnetic liquid sealing has the advantages of strict sealing, zero leakage, long service life, high reliability, complete non-pollution, high rotation speed, optimal torque transmission, low viscous friction and the like, and is used by more and more industries. However, under the conditions of high speed, large shaft diameter and large gap sealing, the pressure resistance and sealing life of the magnetic liquid sealing are significantly reduced, and thus the requirement of high sealing pressure resistance cannot be met. SUMMARY

[0003] The application aims to solve the above technical problems, and provides a magnetic liquid sealing device for improving sealing pressure resistance.

[0004] To solve the above technical problems, the application adopts the technical scheme of:

[0005] The magnetic liquid sealing device for improving sealing pressure resistance comprises a shell, a rotating shaft, an end cover, a first permanent magnet and two pole shoes, and further comprises a second permanent magnet and a stopper.

[0006] Further, the stopper is axially positioned by an elastic stop ring, a shaft shoulder and a bearing, and is circumferentially positioned by a key, a pin or a screw.

[0007] Further, the pole shoes, the stopper and the rotating shaft are made of magnetic conductive material.

[0008] Further, the shell, the end cover, the magnetic isolation ring and the elastic stop ring are made of non-magnetic conductive material.

[0009] Further, a plurality of sealing rings are arranged in sealing grooves arranged on the pole shoes, the stopper and the end cover, and are used for static sealing and dust prevention.

[0010] The application has the advantages of:

[0011] The application increases the second permanent magnet below the first permanent magnet, increases the difference of magnetic induction intensity in the sealing gap below the pole shoes, and improves the sealing pressure resistance. The application solves the technical problem that the existing magnetic liquid sealing has low pressure resistance under the conditions of high speed, large shaft diameter and large gap sealing, and cannot meet the requirement of high sealing pressure resistance. Compared with the background technology, the application has the advantages of high sealing pressure resistance, wide application range, compact structure and convenient use. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention;

[0013] Figure 2 yes Figure 1 A magnified view of a portion of the sealing area;

[0014] Figure 3 This is a schematic diagram of another embodiment of the present invention. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] Example 1

[0017] like Figure 1 and Figure 2 As shown, a magnetic liquid sealing device for improving sealing pressure resistance in this embodiment includes a housing 8, a solid rotating shaft 1, an end cap 2, an elastic retaining ring 3, a first permanent magnet 5-1, two pole shoes 4-1 and 4-2, a self-aligning roller bearing 7, and a magnetic isolation ring 9. It also includes a second permanent magnet 5-2 and two stops 6-1 and 6-2. The two stops are fitted onto the solid rotating shaft 1, and the second permanent magnet 5-2 is fitted onto the solid rotating shaft 1 and located between the two stops. The first stop 6-1 is composed of two rings with different inner diameters. The outer circumferential surface of the second permanent magnet 5-2 is in contact with the inner circumferential surface of the ring with the larger inner diameter of the first stop 6-1. The second stop 6-2 is composed of two rings with different outer diameters. One end of the smaller outer diameter of the second stop 6-2 is connected to one end of the ring with the larger inner diameter of the first stop 6-1, thus fixing the second permanent magnet 5-2 between the first stop 6-1 and the second stop 6-2. The left end face of the first stop block 6-1 is fixed by the elastic retaining ring 3, and the right end face of the second stop block 6-2 contacts the inner ring of the self-aligning roller bearing 7 to achieve axial positioning. The first and second pole shoes 4-1 and 4-2 are respectively fitted onto the two stops 6-1 and 6-2, and their outer peripheral surfaces are in contact with the inner peripheral surface of the housing 8 to complete the radial positioning of the first and second pole shoes 4-1 and 4-2. The first permanent magnet 5-1 is installed in the inner hole of the housing 8 and is located between the first pole shoe 4-1 and the second pole shoe 4-2. The second permanent magnet 5-2 is located below the first permanent magnet 5-1, and the magnetization direction of the second permanent magnet 5-2 is opposite to that of the first permanent magnet 5-1. The right end face of the second pole shoe 4-2 contacts the magnetic shielding ring 9, and the right end face of the magnetic shielding ring 9 presses against the outer ring of the self-aligning roller bearing 7, completing the axial positioning of the second pole shoe 4-2; the left end face of the first pole shoe 4-1 is pressed tightly by the end cap 2, and the end cap 2 is fixed to the housing 8 by bolts. The two stops are circumferentially positioned by keys, pins or screws. Magnetic fluid 11 is adsorbed onto the pole teeth of the first and second pole shoes 4-1 and 4-2 for sealing.

[0018] Furthermore, the present invention also includes five sealing rings, namely the first to fifth sealing rings 10-1, 10-2, 10-3, 10-4 and 10-5. The second and third sealing rings 10-2 and 10-3 are respectively disposed in the sealing grooves disposed on the outer peripheral surfaces of the first pole shoe 4-1 and the second pole shoe 4-2. The fourth and fifth sealing rings 10-4 and 10-5 are both disposed in the sealing grooves disposed on the second stop block 6-2. The first sealing ring 10-1 is disposed in the sealing groove of the end cap.

[0019] Furthermore, the pole shoes, stop blocks, and solid rotating shafts are all made of magnetically conductive materials. The housing, end caps, magnetic shielding rings, and elastic retaining rings are made of non-magnetically conductive materials.

[0020] Example 2

[0021] like Figure 3 As shown, this embodiment of a magnetic liquid sealing device for improving sealing pressure resistance includes a housing 8, a hollow shaft 12, an end cap 2, an elastic retaining ring 3, a first permanent magnet 5-1, two pole shoes 4-1 and 4-2, a self-aligning roller bearing 7, a magnetic shielding ring 9, and a magnetic liquid 11. It also includes a second permanent magnet 5-2 and two stops 6-3 and 6-4. The two stops are installed in the shaft hole of the hollow shaft 12. The second permanent magnet 5-2 is installed in the shaft hole of the hollow shaft 12 and located between the two stops, and its position is fixed by the two stops 6-3 and 6-4. The two stops 6-3 and 6-4 are annular in shape. The left end face of the third stop 6-3 is fixed by the elastic retaining ring 3, and the right end face of the fourth stop 6-4 is axially positioned by a shaft shoulder. The first and second pole shoes 4-1 and 4-2 are respectively fitted onto the hollow shaft 12, with their outer circumferential surfaces fitting against the inner circumferential surface of the housing 8, thus completing the radial positioning of the first and second pole shoes 4-1 and 4-2. The first permanent magnet 5-1 is fitted onto the hollow shaft 12 and is located between the first pole shoe 4-1 and the second pole shoe 4-2. The second permanent magnet 5-2 is located below the first permanent magnet 5-1, and the magnetization direction of the second permanent magnet 5-2 is opposite to that of the first permanent magnet 5-1. The right end face of the second pole shoe 4-2 contacts the magnetic shielding ring 9, and the right end face of the magnetic shielding ring 9 presses against the outer ring of the self-aligning roller bearing 7, thus completing the axial positioning of the second pole shoe 4-2. The self-aligning roller bearing 7 achieves axial positioning through a shoulder. The left end face of the first pole shoe 4-1 is pressed tightly by the end cap 2, which is fixed to the housing 8 by bolts. The magnetic liquid 11 is adsorbed onto the pole teeth of the first and second pole shoes 4-1 and 4-2 for sealing.

[0022] Further, the application also comprises three sealing rings, i.e. first to third sealing rings 10-1, 10-2, 10-3, the second and third sealing rings 10-2, 10-3 are respectively arranged in the sealing grooves arranged on the outer circumferential surfaces of the first pole shoe 4-1 and the second pole shoe 4-2, and the first sealing ring 10-1 is arranged in the sealing groove of the end cover.

[0023] The pole shoe, the stopper and the hollow shaft are made of magnetic conductive material. The shell, the end cover, the magnetic isolation ring and the elastic retainer are made of non-magnetic conductive material.

Claims

1. A magnetic liquid sealing device with improved pressure resistance, comprising a housing, a rotating shaft, an end cover, a first permanent magnet, a pole shoe, a magnetic isolation ring and a plurality of sealing rings, characterized in that: It also includes a second permanent magnet and two blocks, the first permanent magnet is located between the two pole shoes, the second permanent magnet is installed below the first permanent magnet through the block, and the magnetization direction is opposite to the first permanent magnet; the first block is composed of two circular rings with different large and small inner diameters, the second block is composed of two circular rings with different large and small outer diameters, the outer circumferential surface of the second permanent magnet is attached to the inner circumferential surface of the large inner diameter circular ring of the first block, one end of the small outer diameter of the second block is connected with one end of the large inner diameter circular ring of the first block and fixes the second permanent magnet between the first block and the second block; the block is axially positioned by the elastic retainer ring, shaft shoulder and bearing, and is circumferentially positioned by the key, pin or screw; the pole shoe, block and shaft are made of magnetic conductive material, the shell, end cover, magnetic ring and elastic retainer ring are made of non-magnetic conductive material; the sealing ring is arranged in the sealing groove arranged on the pole shoe, block and end cover, and is used for structural static sealing and dust prevention.

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