Magnetic fluid anti-escape sealing device

Abstract

The utility model provides a magnetofluid anti-escape sealing device which is provided with a shell, a cavity is formed in the shell, a shaft is arranged in the cavity and rotationally connected with the shell, a magnet is arranged in the cavity, magnetofluid labyrinth sealing assemblies are arranged on the two sides of the magnet respectively, and magnetic lines are made of magnetic conducting materials through the magnetofluid labyrinth sealing assemblies. A magnetofluid sealing gap is formed between the inner side of the magnetofluid labyrinth sealing assembly and the outer surface of the shaft, magnetofluid is arranged in the magnetofluid sealing gap, the inner side of the magnetofluid labyrinth sealing assembly is in magnetofluid sealing connection with the shaft, and the outer circumference of the magnetofluid labyrinth sealing assembly is in sealing connection with the inner surface of the cavity. An outer side magnetic isolation space is arranged on the outermost side of the magnetofluid labyrinth seal assembly. When the magnetic fluid anti-escape sealing device is used for a long time, magnetic fluid leakage can be prevented, the long-term sealing effect can be kept, and the magnetic fluid anti-escape sealing device can be applied to a conventional sealing occasion or a vacuum sealing occasion. The dynamic sealing device can be widely applied to dynamic sealing.

Description

Technical Field

[0001] This utility model relates to a sealing device, and more particularly to a magnetohydrodynamic anti-escape sealing device. Background Technology

[0002] Magnetofluid sealing devices are widely used in dynamic sealing, but existing magnetofluid sealing devices often experience magnetofluid leakage during long-term use, which eventually leads to a decrease in sealing effect or even complete sealing failure. Utility Model Content

[0003] This utility model addresses the above-mentioned technical problems by providing a magnetic fluid anti-escape sealing device. This magnetic fluid anti-escape sealing device can prevent magnetic fluid leakage even during long-term use and maintain a long-lasting sealing effect. It can be used in conventional sealing applications or in vacuum sealing applications.

[0004] Therefore, the technical solution of this utility model is a magnetic fluid anti-escape sealing device, which includes a shell, an interior cavity, a shaft inside the cavity, a magnet inside the cavity, magnetic fluid labyrinth sealing components on both sides of the magnet, magnetic lines of force passing through the magnetic fluid labyrinth sealing components as magnetic conductive material, a magnetic fluid sealing gap between the inner side of the magnetic fluid labyrinth sealing components and the outer surface of the shaft, magnetic fluid inside the magnetic fluid sealing gap, a magnetic fluid sealing connection between the inner side of the magnetic fluid labyrinth sealing components and the shaft, a sealing connection between the outer circumference of the magnetic fluid labyrinth sealing components and the inner surface of the cavity, and an outer magnetic isolation space on the outermost side of the magnetic fluid labyrinth sealing components.

[0005] Preferably, the magnetohydrodynamic labyrinth seal assembly includes a labyrinth seal assembly body located outside the outer circumference of the shaft, and magnetic pole teeth and magnetic pole holes are alternately arranged on the inner circumference of the labyrinth seal assembly body.

[0006] Preferably, the magnetohydrodynamic labyrinth seal assembly includes a labyrinth seal assembly body, which is part of a shaft, and magnetic pole teeth and magnetic pole holes are alternately arranged on the outer circumference of the labyrinth seal assembly body on the shaft.

[0007] Preferably, the magnet has a magnetic sleeve inside, which is made of a non-magnetic material, and there is an inner gap between the inner side of the magnetic sleeve and the outer circular surface of the shaft.

[0008] Preferably, a bearing is provided on the outer side of the magnetohydrodynamic labyrinth seal assembly, the shaft and the housing are rotatably connected by the bearing, and a spacer is provided between the outer ring of the bearing and the magnetohydrodynamic labyrinth seal assembly.

[0009] Preferably, the outermost magnetic isolation space of the magnetohydrodynamic labyrinth sealing assembly is provided with an O-ring seal inside.

[0010] Preferably, the outermost magnetic isolation space of the magnetohydrodynamic labyrinth sealing assembly is provided with an outer magnetic isolation space sealing cover inside.

[0011] Preferably, the outermost side of the outer magnetic isolation space sealing cover is provided with a stepped sealing notch, which is adapted to the outer side of the labyrinth sealing assembly body.

[0012] Preferably, the outermost side of the outer magnetic isolation space sealing cover is provided with a stepped sealing notch, and the inner circumferential surface of the outer magnetic isolation space sealing cover is provided with a middle gap.

[0013] Preferably, the outermost side of the outer magnetic isolation space sealing cover is provided with a stepped sealing notch, and the axial sealing surface of the stepped sealing notch is provided with a toothed sealing surface.

[0014] The beneficial effects of this invention are as follows: because the magnetic lines of force of the magnet form a ring distribution through the magnetic conduction effect of the magnetic fluid labyrinth sealing assembly, most of the magnetic lines of force form a closed loop distribution through the magnetic pole teeth, adsorbing and covering the outer surface of the magnetic pole teeth, filling and sealing the magnetic fluid sealing gap. Since the outermost side of the magnetic fluid labyrinth sealing assembly has an outer magnetic isolation space, when the magnetic lines of force of the magnet's magnetic pole return to the magnet through the magnetic pole teeth, the distribution path of the magnetic lines of force in the outer magnetic isolation space is isolated and returns to the other magnetic pole of the magnet along the outermost magnetic pole teeth to form a loop. In this way, there is almost no distribution of magnetic lines of force in the outer magnetic isolation space. Therefore, it is difficult for magnetic fluid to remain in the outer magnetic isolation space. When the shaft rotates, the working magnetic fluid rarely escapes to the outside due to the centrifugal force of rotation, ensuring that the filled magnetic fluid will not be leaked, and a good magnetic fluid sealing effect can be formed for a long time. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the appearance of an embodiment of the present utility model;

[0016] Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model;

[0017] Figure 3 yes Figure 2 A magnified view of a portion of the image;

[0018] Figure 4 This is a cross-sectional view of Embodiment 2 of this utility model;

[0019] Figure 5 yes Figure 4 A magnified view of a portion of the image;

[0020] Figure 6 This is a cross-sectional view of Embodiment 3 of this utility model;

[0021] Figure 7 yes Figure 6 A magnified view of a portion of the image;

[0022] Figure 8 This is a cross-sectional view of embodiment 4 of this utility model;

[0023] Figure 9 yes Figure 8 A magnified view of a portion of the image;

[0024] Figure 10 This is a cross-sectional view of embodiment 5 of this utility model;

[0025] Figure 11 yes Figure 10 A magnified view of a portion of the image;

[0026] Figure 12 This is a cross-sectional view of Embodiment 6 of this utility model;

[0027] Figure 13 yes Figure 12 A magnified view of a portion of the image;

[0028] Figure 14 This is a cross-sectional view of embodiment 7 of this utility model;

[0029] Figure 15 yes Figure 14 A magnified view of a portion of the image;

[0030] Figure 16-20 These are schematic diagrams of various structures of the outer sealing cover.

[0031] Explanation of symbols in the diagram:

[0032] 1. Housing; 2. Shaft; 3. Bearing; 4. Cavity; 5. End Cap; 7. Sealing Ring; 8. Magnet; 9. Magnetic Spacer; 10. Magnetorheological Fluid; 11. Magnetic Pole Teeth; 12. Magnetic Pole Hole; 13. Labyrinth Seal Assembly; 1301. Labyrinth Seal Assembly Body; 14. Spacer; 15. Outer Magnetic Isolation Space Sealing Cover; 1501. Tapered Chamfer; 1502. Stepped Sealing Notch; 1503. Intermediate Gap; 1505. Hole; 1507. Toothed Sealing Surface; 20. Outer Magnetic Isolation Space; 21. Inner Gap of Magnetic Spacer. Detailed Implementation

[0033] The present invention will be further described below with reference to the embodiments.

[0034] Figures 1-20This is a schematic diagram of various embodiments of a magnetic fluid escape-proof sealing device of this utility model. As shown in the figure, it has a shell 1, a cavity 4 inside the shell 1, a shaft 2 inside the cavity 4, the shaft 2 is rotatably connected to the shell 1, a magnet 8 is provided in the cavity 4, and magnetic fluid labyrinth sealing components 13 are respectively provided on both sides of the magnet 8. Magnetic lines of force pass through the magnetic fluid labyrinth sealing components 13 as magnetic conductive material. A magnetic fluid sealing gap is provided between the inner side of the magnetic fluid labyrinth sealing component 13 and the outer surface of the shaft 2. Magnetic fluid 10 is provided inside the magnetic fluid sealing gap. The inner side of the magnetic fluid labyrinth sealing component 13 forms a magnetic fluid sealing connection with the shaft 2. The outer circumference of the magnetic fluid labyrinth sealing component 13 is sealed to the inner surface of the cavity 4. An outer magnetic isolation space 20 is provided on the outermost side of the magnetic fluid labyrinth sealing component 13.

[0035] Because the magnetic lines of force of magnet 8 form a ring distribution through the magnetic conduction effect of magnetic fluid labyrinth sealing component 13, and most of the magnetic lines of force form a closed loop distribution through magnetic pole teeth 11, magnetic fluid 10 is adsorbed and wrapped on the outer surface of magnetic pole teeth 11, and the magnetic fluid sealing gap is filled and sealed. Figure 2-3 As can be seen, since the outermost side of the magnetic fluid labyrinth sealing assembly 13 is provided with an outer magnetic isolation space 20, when the magnetic lines of force of the magnetic poles of the magnet 8 return to the magnet 8 through the magnetic pole teeth 11, the distribution route of the magnetic lines of force in the outer magnetic isolation space 20 is isolated and then returns to the other magnetic pole of the magnet 8 along the outermost magnetic pole teeth 11 to form a loop. In this way, there is almost no distribution of magnetic lines of force in the outer magnetic isolation space 20. Therefore, it is difficult for the magnetic fluid 10 to remain in the outer magnetic isolation space 20. When the shaft 2 rotates, the working magnetic fluid 10 rarely escapes to the outside due to the centrifugal force of rotation, ensuring that the filled magnetic fluid 10 will not be leaked and can form a good magnetic fluid sealing effect for a long time.

[0036] Figure 2-3 As can be seen, the magnetohydrodynamic labyrinth sealing assembly 13 includes a labyrinth sealing assembly body 1301, which is located on the outer side of the outer circumference of the shaft 2. Magnetic pole teeth 11 and magnetic pole holes 12 are alternately arranged on the inner circumference of the labyrinth sealing assembly body 1301.

[0037] Figure 6-9 As can be seen, the magnetohydrodynamic labyrinth sealing assembly 13 includes a labyrinth sealing assembly body 1301, which is part of the shaft 2. Magnetic pole teeth 11 and magnetic pole holes 12 are alternately arranged on the outer circumference of the labyrinth sealing assembly body 1301 on the shaft 2.

[0038] Figure 12-13As can be seen, the magnetohydrodynamic labyrinth seal assembly 13 includes two labyrinth seal assembly bodies 1301. One labyrinth seal assembly body 1301 is located on the outer circumference of the shaft 2, and magnetic pole teeth 11 and magnetic pole holes 12 are alternately arranged on the inner circumference of the labyrinth seal assembly body 1301. The other labyrinth seal assembly body 1301 is located on the shaft 2 and is part of the shaft 2. Magnetic pole teeth 11 and magnetic pole holes 12 are alternately arranged on the outer circumference of the labyrinth seal assembly body 1301 located on the shaft 2. The magnetic pole teeth 11 and magnetic pole holes 12 provided on the two labyrinth seal assembly bodies 1301 are interlocked to form a composite magnetohydrodynamic labyrinth seal assembly 13. A magnetohydrodynamic sealing gap is provided between the magnetic pole teeth 11 and magnetic pole holes 12.

[0039] The magnet 8 in the above embodiments is provided with a magnetic sleeve 9 inside. The magnetic sleeve 9 is made of non-magnetic material. There is a magnetic sleeve inner gap 21 between the inner side of the magnetic sleeve 9 and the outer circular surface of the shaft 2. The outer side of the magnetic fluid labyrinth sealing assembly 13 is provided with a bearing 3. The shaft 2 and the housing 1 are rotatably connected by the bearing 3. There is a spacer 14 between the outer ring of the bearing 3 and the magnetic fluid labyrinth sealing assembly 13. Other rotary connection designs can be selected.

[0040] In the various embodiments described above, the outermost magnetic isolation space 20 of the magnetic fluid labyrinth sealing assembly 13 is provided with an outer magnetic isolation space sealing cover 15 inside. The outer magnetic isolation space sealing cover 15 inside the outer magnetic isolation space 20 can be various outer sealing structures, further forming an outer fixed seal. In this way, even if a small amount of magnetic fluid 10 spills into the outer magnetic isolation space 20, the outer fixed seal will act as a barrier. When the equipment is working or when the entire device is static or rotating, the micro-movement of the magnetic fluid will return to the outer surface of the magnetic pole teeth 11 to form an adsorption and encapsulation state. Therefore, such a fixed sealing structure further limits the leakage of a small amount of magnetic fluid 10 and further maintains a long-lasting sealing effect. The fixed sealing structure inside the outer magnetic isolation space 20 can be one of the following:

[0041] Figure 7 In the magnetic fluid labyrinth sealing assembly 13, the outermost magnetic isolation space 20 is provided on the outermost side, and the outer magnetic isolation space sealing cover 15 inside is an O-ring.

[0042] Figure 9 In the middle, the outermost side of the outer magnetic isolation space sealing cover 15 is provided with a stepped sealing notch 1502, which is adapted to the outer side of the labyrinth sealing assembly body 1301.

[0043] Figure 11In the middle, the outermost side of the outer magnetic isolation space sealing cover 15 is provided with a stepped sealing notch 1502, and the inner circumferential surface of the outer magnetic isolation space sealing cover 15 is provided with a middle gap 1503, which further increases the difficulty of the magnetic fluid 10 overflowing.

[0044] Figure 15 In the middle, the outermost side of the outer magnetic isolation space sealing cover 15 is provided with a stepped sealing notch 1502, and the axial sealing surface of the stepped sealing notch 1502 is provided with a toothed sealing surface 1507, which further increases the difficulty of the magnetic fluid 10 overflowing.

[0045] This invention further solves the problem of slight leakage of magnetic fluid in traditional magnetic fluid sealing structures due to long-term use, improves the long-term sealing reliability of magnetic fluid seals, and extends the service life of magnetic fluid seals.

[0046] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A magnetic fluid escape-proof sealing device, characterized by: The shell is internally provided with a cavity, the cavity is internally provided with a shaft, the shaft is rotationally connected with the shell, the cavity is provided with a magnet, the two sides of the magnet are respectively provided with a magnetic fluid labyrinth seal assembly, the magnetic force line passes through the magnetic fluid labyrinth seal assembly and is a magnetically conductive material, a magnetic fluid sealing gap is arranged between the inner side of the magnetic fluid labyrinth seal assembly and the outer surface of the shaft, the magnetic fluid sealing gap is internally provided with a magnetic fluid, the inner side of the magnetic fluid labyrinth seal assembly is in magnetic fluid sealing connection with the shaft, the outer circumference of the magnetic fluid labyrinth seal assembly is in sealing connection with the inner surface of the cavity, and the outermost side of the magnetic fluid labyrinth seal assembly is provided with an outer magnetic isolation space.

2. The magnetic fluid escape-proof sealing device according to claim 1, characterized by: The magnetic fluid labyrinth seal assembly comprises a labyrinth seal assembly body, the labyrinth seal assembly body is located outside the outer circumference of the shaft, and the inner circumference of the labyrinth seal assembly body is alternately provided with magnetic pole teeth and magnetic pole holes.

3. The magnetic fluid escape-proof sealing device according to claim 1, characterized by: The magnetic fluid labyrinth seal assembly comprises a labyrinth seal assembly body, the labyrinth seal assembly body is a part of the shaft, and the outer circumference of the labyrinth seal assembly body provided on the shaft is alternately provided with magnetic pole teeth and magnetic pole holes.

4. The magnetic fluid escape-proof sealing device according to any one of claims 1 to 3, characterized by: The inner side of the magnetic separation sleeve is provided with a magnetic separation sleeve inner gap between the outer circular surface of the shaft.

5. The magnetic fluid escape-proof sealing device according to any one of claims 1 to 3, characterized by: The outer side of the magnetic fluid labyrinth seal assembly is provided with a bearing, the shaft is rotationally connected with the shell through the bearing, and a separation pad is arranged between the outer ring of the bearing and the magnetic fluid labyrinth seal assembly.

6. The magnetic fluid escape-proof sealing device according to claim 1, characterized by: The inner side of the magnetic fluid labyrinth seal assembly is provided with a magnetic fluid labyrinth seal assembly body, the outer circumference of the magnetic fluid labyrinth seal assembly body is alternately provided with magnetic pole teeth and magnetic pole holes, and the outermost side of the magnetic fluid labyrinth seal assembly body is provided with an outer magnetic isolation space.

7. The magnetic fluid escape-proof sealing device according to claim 1, characterized by: The outermost side of the outer magnetic isolation space sealing cover is provided with a stepped sealing gap, and the stepped sealing gap is adapted to the outer side of the labyrinth seal assembly body.

8. The magnetic fluid escape-proof sealing device according to claim 1, characterized by: The outermost side of the outer magnetic isolation space sealing cover is provided with a stepped sealing gap, and the inner circumferential surface of the outer magnetic isolation space sealing cover is provided with an intermediate gap.

9. The magnetic fluid escape-proof sealing device according to claim 1, characterized by: The outermost side of the outer magnetic isolation space sealing cover is provided with a stepped sealing gap, and the axial sealing surface of the stepped sealing gap is provided with a tooth-shaped sealing surface.

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