Composite type magnetofluid anti-escape sealing device

Abstract

The utility model provides a composite type magnetic fluid anti-escape sealing device which is provided with a shell, a cavity is formed in the shell, a shaft is arranged in the cavity, the shaft is connected with the shell in a rotating mode, a magnet is arranged in the cavity, magnetic fluid labyrinth sealing assemblies are arranged on the two sides of the magnet respectively, and magnetic lines are made of magnetic conducting materials through the magnetic fluid 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 composite magnetic fluid anti-escape sealing device is used for a long time, leakage of magnetic fluid can be prevented, the long-term sealing effect is kept, and the composite magnetic fluid anti-escape sealing device can be applied to conventional sealing occasions or vacuum sealing occasions. The dynamic sealing device can be widely applied to dynamic sealing.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealing device, in particular to a composite magnetic fluid anti-escape sealing device. BACKGROUND

[0002] The magnetic fluid sealing device is widely applied to dynamic sealing, but the existing magnetic fluid sealing device often appears magnetic fluid leakage during long time use, finally leads to sealing effect decline, even complete sealing failure technical problem. UTILITY MODEL CONTENTS

[0003] The utility model provides a composite magnetic fluid anti-escape sealing device for above technical problem, this composite magnetic fluid anti-escape sealing device can prevent magnetic fluid leakage during long time use, can keep long sealing effect, can be applied in conventional sealing occasion, or be applied in vacuum sealing occasion.

[0004] Therefore, the technical scheme of the utility model is a composite magnetic fluid anti-escape sealing device, is equipped with the casing, is equipped with the cavity in the inside of casing, is equipped with the shaft in the inside of cavity, the shaft is rotatably connected with casing, is equipped with the magnet in the cavity, is equipped with the magnetic fluid labyrinth sealing assembly on the both sides of magnet, the magnetic fluid labyrinth sealing assembly is magnetic conductive material, can guide the magnetic force line of magnet, is equipped with the magnetic fluid sealing gap between the inner side of magnetic fluid labyrinth sealing assembly and the outer surface of shaft, is equipped with the magnetic fluid in the inside of magnetic fluid sealing gap, the inner side of magnetic fluid labyrinth sealing assembly and the shaft form magnetic fluid sealing connection, the outer circumference of magnetic fluid labyrinth sealing assembly and the inner surface of cavity are sealedly connected, the outermost side of magnetic fluid labyrinth sealing assembly is equipped with the outside magnetic isolation space;

[0005] The magnetic fluid labyrinth sealing assembly includes two labyrinth sealing assembly bodies, one labyrinth sealing assembly body is located outside the outer circumference of the shaft, and magnetic pole teeth and magnetic pole cavities are alternately arranged on the inner circumference of the labyrinth sealing assembly body; the other labyrinth sealing assembly body is arranged on the shaft and is part of the shaft, and magnetic pole teeth and magnetic pole cavities are alternately arranged on the outer circumference of the labyrinth sealing assembly body arranged on the shaft; the magnetic pole teeth and the magnetic pole cavities arranged on the two labyrinth sealing assembly bodies are inserted together to form a composite magnetic fluid labyrinth sealing assembly; and a magnetic fluid sealing gap is arranged between the magnetic pole teeth and the magnetic pole cavities.

[0006] Preferably, the inside of the magnet is provided with a magnetic isolation sleeve, the magnetic isolation sleeve is made of non-magnetic conductive material, and a magnetic isolation sleeve inner gap is arranged between the inner side of the magnetic isolation sleeve and the outer circular surface of the shaft.

[0007] Preferably, a bearing is arranged on the outer side of the magnetic fluid labyrinth sealing assembly, the shaft is rotatably connected with the casing through the bearing, and a spacer is arranged between the outer ring of the bearing and the magnetic fluid labyrinth sealing assembly.

[0008] Preferably, the outermost side of the magnetic fluid labyrinth seal assembly is provided with an outer magnetic isolation space, and the inner side of the outer magnetic isolation space is provided with an O-shaped sealing ring.

[0009] Preferably, the outermost side of the magnetic fluid labyrinth seal assembly is provided with an outer magnetic isolation space, and the inner side of the outer magnetic isolation space is provided with an outer magnetic isolation space sealing cover.

[0010] Preferably, 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.

[0011] Preferably, 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.

[0012] Preferably, 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.

[0013] The utility model discloses beneficial effect is, because the magnetic force line of magnet passes through the magnetic conductive effect of magnetic fluid labyrinth seal assembly and forms the annular distribution of magnetic force line, and most of the magnetic force line forms the closed loop distribution through the magnetic pole tooth, and the outer surface of magnetic pole tooth is covered with magnetic fluid, and the magnetic fluid sealing gap is filled and sealed, and because the outermost side of magnetic fluid labyrinth seal assembly is provided with outer magnetic isolation space, when the magnetic force line of the magnetic pole of magnet returns to the magnet through the magnetic pole tooth, the distribution route of the magnetic force line in the outer magnetic isolation space is isolated and then returns to the other magnetic pole of magnet along the outermost magnetic pole tooth and forms a loop, so that there is almost no distribution of magnetic force line in the outer magnetic isolation space, therefore, it is difficult to store magnetic fluid in the outer magnetic isolation space, and when the shaft rotates, the magnetic fluid in operation is rarely escaped to the outside because of the rotation centrifugal force, guarantee that the filled magnetic fluid does not appear the problem of omission, and good magnetic fluid sealing effect can be formed for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the appearance schematic drawing of the utility model embodiment;

[0015] Figure 2 It is the sectional view of the utility model embodiment 1;

[0016] Figure 3 It is Figure 2 The partial close -up of;

[0017] Figure 4 It is the sectional view of the utility model embodiment 2;

[0018] Figure 5 It is Figure 4 The partial close -up of;

[0019] Figure 6is a sectional view of the embodiment 3 of the utility model;

[0020] Figure 7 is Figure 6 a local enlarged view of

[0021] Figure 8 is a sectional view of the embodiment 4 of the utility model;

[0022] Figure 9 is Figure 8 a local enlarged view of

[0023] Figure 10 is a sectional view of the embodiment 5 of the utility model;

[0024] Figure 11 is Figure 10 a local enlarged view of

[0025] Figure 12 is a sectional view of the embodiment 6 of the utility model;

[0026] Figure 13 is Figure 12 a local enlarged view of

[0027] Figure 14 is a sectional view of the embodiment 7 of the utility model;

[0028] Figure 15 is Figure 14 a local enlarged view of

[0029] Figure 16 In the five structure schematic diagram of outer magnetic isolation space sealing cover, a, b, c, d, e are respectively.

[0030] Symbol explanation in the figure:

[0031] 1. shell;2. shaft;3. bearing;4. cavity;5. end cover;7. sealing ring;8. magnet;9. magnetic sleeve;10. magnetic fluid;11. magnetic pole tooth;12. magnetic pole cave;13. labyrinth sealing assembly;1301. labyrinth sealing assembly main body;14. spacer;15. outer magnetic isolation space sealing cover;1501. conical chamfer;1502. step sealing gap;1503. intermediate gap;1505. hole;1507. tooth-shaped sealing surface;20. outer magnetic isolation space;21. magnetic sleeve inner gap. DETAILED DESCRIPTION

[0032] The utility model will be further described in combination with the embodiment.

[0033] Figures 1-16It is various embodiments schematic diagram of the utility model of a kind of composite magnetic fluid escape-preventing sealing device, it can be seen in the drawing, it is equipped with shell 1, the inside of shell 1 is equipped with cavity 4, the inside of cavity 4 is equipped with shaft 2, shaft 2 is rotatably connected with shell 1, it is equipped with magnet 8 in cavity 4, the both sides of magnet 8 are equipped with magnetic fluid labyrinth seal assembly 13 respectively, magnetic fluid labyrinth seal assembly 13 is magnetically conductive material, can guide the magnetic force line of magnet 8, magnetic fluid labyrinth seal assembly 13 inside and the outer surface of shaft 2 between are equipped with magnetic fluid sealing gap, the inside of magnetic fluid sealing gap is equipped with magnetic fluid 10, magnetic fluid labyrinth seal assembly 13 inside and shaft 2 form magnetic fluid sealing connection, the outer circumference of magnetic fluid labyrinth seal assembly 13 and the inner surface of cavity 4 are sealedly connected, the outermost side of magnetic fluid labyrinth seal assembly 13 is equipped with outside magnetic isolation space 20.

[0034] Because the magnetic force line of magnet 8 forms annular distribution of magnetic force line by the magnetic conduction effect of magnetic fluid labyrinth seal assembly 13, most of the magnetic force line forms closed loop distribution through magnetic pole tooth 11, and the magnetic fluid 10 is adsorbed and covered on the outer surface of magnetic pole tooth 11, filling and sealing the magnetic fluid sealing gap; Figures 2-3 It can be seen in the drawing that, since the outermost side of magnetic fluid labyrinth seal assembly 13 is equipped with outside magnetic isolation space 20, when the magnetic force line of the magnetic pole of magnet 8 passes through magnetic pole tooth 11 and returns to magnet 8, the distribution route of the magnetic force line in outside magnetic isolation space 20 is isolated and then returns to the other magnetic pole of magnet 8 along the outermost magnetic pole tooth 11 to form a loop, so that there is almost no distribution of magnetic force line in outside magnetic isolation space 20, therefore, it is difficult for magnetic fluid 10 to remain in outside magnetic isolation space 20, and when shaft 2 is rotating, the magnetic fluid 10 in operation is less likely to escape to the outside due to the centrifugal force of rotation, so that the problem of missing filled magnetic fluid 10 is avoided, and a good magnetic fluid sealing effect can be formed for a long time.

[0035] Figures 2-3 It can be seen in the drawing that magnetic fluid labyrinth seal assembly 13 includes labyrinth seal assembly body 1301, and the labyrinth seal assembly body 1301 is located outside the outer circumference of shaft 2, and the inner circumference of the labyrinth seal assembly body 1301 is alternately provided with magnetic pole tooth 11 and magnetic pole cavity 12.

[0036] Figures 6-9 It can be seen in the drawing that magnetic fluid labyrinth seal assembly 13 includes labyrinth seal assembly body 1301, and the labyrinth seal assembly body 1301 is a part of shaft 2, and the outer circumference of the labyrinth seal assembly body 1301 provided on shaft 2 is alternately provided with magnetic pole tooth 11 and magnetic pole cavity 12.

[0037] Figures 12-13As can be seen, the magnetic fluid labyrinth seal assembly 13 comprises two labyrinth seal assembly bodies 1301, one of which is located outside the outer circumference of the shaft 2, and the inner circumference of the labyrinth seal assembly body 1301 is alternately provided with the magnetic pole teeth 11 and the magnetic pole holes 12; the other labyrinth seal assembly body 1301 is provided on the shaft 2 and is part of the shaft 2, and the outer circumference of the labyrinth seal assembly body 1301 provided on the shaft 2 is alternately provided with the magnetic pole teeth 11 and the magnetic pole holes 12; the magnetic pole teeth 11 and the magnetic pole holes 12 provided on the two labyrinth seal assembly bodies 1301 are inserted together to form a composite whole magnetic fluid labyrinth seal assembly 13; the magnetic pole teeth 11 and the magnetic pole holes 12 are provided with a magnetic fluid sealing gap.

[0038] The inside of the magnet 8 of the above various embodiment schematic diagrams is provided with a magnetic isolation sleeve 9, the magnetic isolation sleeve 9 is a non-magnetic material, and the inside of the magnetic isolation sleeve 9 and the outer circular surface of the shaft 2 are provided with a magnetic isolation sleeve inner gap 21; the outside of the magnetic fluid labyrinth seal assembly 13 is provided with a bearing 3, the shaft 2 and the housing 1 are rotatably connected through the bearing 3, and the outer ring of the bearing 3 and the magnetic fluid labyrinth seal assembly 13 are provided with a spacer 14, and other rotatable connection designs can be selected.

[0039] In the above various embodiments, the inside of the outer magnetic isolation space 20 provided on the outermost side of the magnetic fluid labyrinth seal assembly 13 is provided with an outer magnetic isolation space sealing cover 15, and the outer magnetic isolation space sealing cover 15 provided in the inside of the outer magnetic isolation space 20 can be various outer sealing structures, further forming a fixed seal on the outside, so that even if a small amount of magnetic fluid 10 overflows into the outer magnetic isolation space 20, due to the fixed seal on the outside, the magnetic fluid will return to the outer surface of the magnetic pole teeth 11 to form an adsorption and coating state when working or the whole device is static or rotating, therefore, such a fixed sealing structure further limits the leakage of a small amount of magnetic fluid 10, further maintaining long-term sealing effect; the fixed sealing structure in the inside of the outer magnetic isolation space 20 can be the following various:

[0040] Figure 7 In the above various embodiments, the inside of the outer magnetic isolation space 20 provided on the outermost side of the magnetic fluid labyrinth seal assembly 13 is provided with an outer magnetic isolation space sealing cover 15, and the outer magnetic isolation space sealing cover 15 provided in the inside of the outer magnetic isolation space 20 can be various outer sealing structures, further forming a fixed seal on the outside, so that even if a small amount of magnetic fluid 10 overflows into the outer magnetic isolation space 20, due to the fixed seal on the outside, the magnetic fluid will return to the outer surface of the magnetic pole teeth 11 to form an adsorption and coating state when working or the whole device is static or rotating, therefore, such a fixed sealing structure further limits the leakage of a small amount of magnetic fluid 10, further maintaining long-term sealing effect; the fixed sealing structure in the inside of the outer magnetic isolation space 20 can be the following various:

[0041] Figure 9 In the above various embodiments, the outermost side of the outer magnetic isolation space sealing cover 15 is provided with a stepped sealing gap 1502, and the stepped sealing gap 1502 is adapted to the outside of the labyrinth seal assembly body 1301.

[0042] Figure 11The outermost side of the outer magnetic isolation space sealing cover 15 is provided with a stepped sealing gap 1502, and the inner circumferential surface of the outer magnetic isolation space sealing cover 15 is provided with an intermediate gap 1503, which further increases the difficulty of the magnetic fluid 10 overflowing.

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

[0044] The utility model further solves the problem that the traditional magnetic fluid sealing structure will have a small amount of magnetic fluid leakage after long-term use, improves the reliability of long-term sealing of the magnetic fluid sealing, and prolongs the service life of the magnetic fluid sealing.

[0045] The above is only a specific embodiment of the utility model, and cannot limit the scope of the utility model. The replacement of equivalent components or equivalent changes and modifications made within the scope of the utility model patent protection should still be within the scope of the utility model claims.

Claims

1. A composite magnetohydrodynamic anti-escape sealing device, characterized in that: 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 fluid labyrinth seal assembly is a magnetic conductive material and can guide the magnetic force line generated by the magnet, 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. The magnetic fluid labyrinth seal assembly comprises two labyrinth seal assembly bodies, one of which 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; the other labyrinth seal assembly body is arranged on the shaft and is a part of the shaft, and the outer side circumference of the labyrinth seal assembly body arranged on the shaft is alternately provided with magnetic pole teeth and magnetic pole holes; the magnetic pole teeth and the magnetic pole holes arranged on the two labyrinth seal assembly bodies are inserted together to form a composite whole magnetic fluid labyrinth seal assembly; and a magnetic fluid sealing gap is arranged between the magnetic pole teeth and the magnetic pole holes.

2. The composite type magnetic fluid escape-proof sealing device according to claim 1, 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.

3. The composite type magnetic fluid escape-proof sealing device according to claim 1, 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 spacer is arranged between the outer ring of the bearing and the magnetic fluid labyrinth seal assembly.

4. The composite type magnetic fluid escape-proof sealing device according to claim 1, 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 composite type magnetic fluid escape-proof sealing device according to claim 1, 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 spacer is arranged between the outer ring of the bearing and the magnetic fluid labyrinth seal assembly.

6. The composite type magnetic fluid escape-proof sealing device according to claim 1, 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.

7. The composite type magnetic fluid escape-proof sealing device according to claim 1, 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 spacer is arranged between the outer ring of the bearing and the magnetic fluid labyrinth seal assembly. 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 spacer is arranged between the outer ring of the bearing and the magnetic fluid labyrinth seal assembly.

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