CN217271906U - Magnetic liquid sealing device - Google Patents

Abstract

The utility model provides a magnetic liquid sealing device, including casing, pivot, pole shoe and magnetic fluid, the casing has the appearance chamber, the pivot is fixed in the casing and runs through the appearance chamber, the pole shoe has the utmost point tooth, the magnetic fluid adsorbs between utmost point tooth and the pivot, the utmost point tooth has the roof just to the pivot and the lateral wall that links to each other with the roof, be formed with the chamfer between roof and the lateral wall, through forming the chamfer on the utmost point tooth, be difficult to fish tail the pivot when the party assembles; on the other hand, the magnetic field force of the pole teeth with the chamfers on the tooth tops is more uniform relative to the rectangular pole teeth, so that the phenomenon of agglomeration of magnetic particles in the magnetic liquid is not easy to occur, and the pressure resistance and the sealing performance of the magnetic liquid sealing device are improved.

Description

Magnetic liquid sealing device

Technical Field

The utility model belongs to the sealed field of mechanical engineering especially relates to a magnetic liquid sealing device.

Background

The magnetic liquid is a stable novel functional material formed by highly dispersing nano-scale magnetic particles in a base carrier liquid. Sealing is an important field of application for magnetic fluids. Magnetic liquid sealing technology is increasingly being used by more and more industries due to its advantages of zero leakage, no mechanical wear, long life, simple structure, etc.

The magnetic liquid sealing device generally has a pole shoe and a rotating shaft, and the magnetic liquid is absorbed between the pole teeth of the rotating shaft and the pole shoe, so that the sealing function is realized. However, the existing magnetic liquid sealing device is easy to have the problem that the pressure resistance of the magnetic liquid sealing device is poor due to the fact that magnetic particles are easy to agglomerate.

Disclosure of Invention

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a magnetic liquid sealing device with high pressure resistance.

The utility model provides a magnetic liquid sealing device, includes casing, pivot, pole shoe and magnetic liquid, the casing has the appearance chamber, the pivot is fixed in the casing runs through the appearance chamber, the pole shoe has the utmost point tooth, magnetic liquid adsorb in the utmost point tooth with between the pivot, the utmost point tooth have just right the roof of pivot and with the lateral wall that the roof links to each other, the roof with be formed with the chamfer between the lateral wall.

Further, the chamfer is a bevel or a fillet.

Furthermore, the width of the pole teeth is 0.2-1 mm, and the ratio of the distance between two adjacent pole teeth to the width of the pole teeth is 3-5.

Further, when the chamfer is an oblique angle, the oblique angle is 30-60 degrees, and the two chamfers of the same pole tooth are arranged at intervals.

Further, when the chamfer is a fillet, the radius of curvature of the fillet is less than or equal to 1/2 of the tooth width.

Furthermore, a surface texture is formed on the outer surface of the rotating shaft opposite to the pole shoe, and the magnetic liquid is adsorbed in the surface texture.

Further, the surface texture is a plurality of grooves distributed in an array.

Further, the surface texture is a spiral groove or a plurality of grooves arranged in parallel, and the grooves surround the axis of the rotating shaft.

Furthermore, the cross section of the groove is trapezoidal, and the width of the opening of the groove is larger than that of the bottom of the groove.

Further, the housing includes an end cap removably secured to an end of the cavity.

The magnetic liquid sealing device provided by the utility model comprises a pole shoe, wherein the pole shoe is provided with pole teeth, and the rotating shaft is not easy to scratch during assembly on one side by forming chamfers on the pole teeth; on the other hand, the magnetic field force of the pole teeth with the chamfers on the tooth tops is more uniform relative to the rectangular pole teeth, so that the phenomenon of agglomeration of magnetic particles in the magnetic liquid is not easy to occur, and the pressure resistance and the sealing performance of the magnetic liquid sealing device are improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a magnetic liquid sealing device according to a preferred embodiment of the present invention;

fig. 2 to 4 are enlarged views of a portion II of fig. 1, in which fig. 2 shows a trapezoidal tooth, fig. 3 shows an arc-shaped tooth, and fig. 4 shows a semicircular tooth;

fig. 5 to 8 are schematic views of different surface textures in a magnetic liquid sealing device.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1 and 2, the present invention provides a magnetic liquid sealing device 100 according to a preferred embodiment, which includes a housing 10, a rotating shaft 20, a pole piece 30, a bearing 40 and a magnetic liquid 50.

The shell 10 is provided with a cavity 11 and an end cover 12, the end cover 12 is detachably fixed at the end of the cavity 11, and the end cover 12 can be directly fixed on the shell 10 in a threaded connection manner or fixed on the shell 10 in a screw locking manner; the rotating shaft 20 is fixed to the housing 10 and penetrates through the cavity 11; the pole shoe 30 has a pole tooth 31, the magnetic liquid 50 is absorbed between the pole tooth 31 and the rotating shaft 20, the pole tooth 31 has a top wall 311 facing the rotating shaft 20 and a side wall 312 connected to the top wall 311, and a chamfer 313 is formed between the top wall 311 and the side wall 312.

By forming the chamfer 313 on the tooth 31, the rotating shaft 20 is not easily scratched when assembled on one hand; on the other hand, the magnetic force applied to the tooth top of the tooth 31 with the chamfer 313 is more uniform than that applied to a rectangular tooth, so that the magnetic particles in the magnetic liquid 50 are less prone to agglomeration, and the pressure resistance and the sealing performance of the magnetic liquid sealing device 100 are improved.

Referring to fig. 3 to 4, the chamfer 313 is a bevel or a fillet. When the chamfer 313 is an oblique angle, the pole tooth 31 is a trapezoidal tooth; when the chamfer 313 is a fillet and the radius of curvature of the fillet is smaller than 1/2 of the width w of the pole tooth 31, or when the top wall 311 of the pole tooth 31 is arc-shaped, the pole tooth 31 is arc-shaped; when the chamfer 313 is a fillet with a radius of curvature equal to 1/2 of the width w of the tooth 31, the tooth 31 is a semicircular tooth.

Simulation analysis shows that the magnetic field gradients of the three tooth forms at the tooth top are ordered as follows: the rectangular teeth > the trapezoidal teeth > the semicircular teeth, that is, the magnetic force applied to the magnetic liquid 50 at the tooth tops of the three tooth shapes is uniform: semicircular teeth, trapezoidal teeth and rectangular teeth. Since the magnetic field force is more uniform, the magnetic particles in the magnetic liquid 50 are less likely to agglomerate, and thus, the semicircular teeth, the arc-shaped teeth, and the trapezoidal teeth are less likely to agglomerate magnetic particles than the rectangular teeth, and the pressure resistance and the sealing ability are more excellent than those of the rectangular teeth.

Furthermore, the width w of the pole teeth 31 is 0.2-1 mm, and the ratio of the distance d between two adjacent pole teeth 31 to the width w of the pole teeth 31 is 3-5. Through setting up the width of utmost point tooth 31 and adjacent with it the distance between the utmost point tooth 31 to guarantee magnetic liquid 50 can evenly adsorb thereby satisfy the requirement of leakproofness on the utmost point tooth 31, in addition be convenient for process utmost point tooth 31. Preferably, the width w of the tooth 31 is 0.2mm, and the distance d between two adjacent teeth 31 is 0.8 mm.

Further, when the chamfer 311 of the tooth 31 is an oblique angle α, the oblique angle α is 30 ° to 60 °, preferably 40 ° to 50 °, two oblique angles of the same tooth 31 are not connected, that is, the two chamfers 311 of the tooth 31 are spaced; when the chamfer 311 of the tooth 31 is a fillet, the radius of the fillet is less than or equal to 1/2 of the width w of the tooth 31. In this way, on the one hand, the processing of the chamfer 311 is facilitated, and on the other hand, a sharp tip can be prevented from appearing at the top of the pole tooth 31, which is disadvantageous to the uniform adsorption of the magnetic liquid 50 and further affects the sealing performance of the magnetic liquid sealing device 100.

The outer surface of the rotating shaft 20 is formed with a surface texture 21 opposite to the pole shoe 30. The middle surface texture of the utility model is a lattice which is processed on the friction surface and has a pit, a groove or a small groove with a certain size and arrangement, so as to obtain the required surface performance. The surface texture adopts pits, grooves or micro grooves instead of bulges, so that the processing is convenient, the installation is convenient, and the damage caused by collision during the installation is avoided.

The magnetic liquid 50 is absorbed between the teeth 311 and the surface texture 21, so that friction between the rotating shaft 20 and the magnetic liquid 50 can be reduced, thereby reducing torque generated by friction between the magnetic liquid 50 and the rotating shaft 20 during rotation of the rotating shaft 20, and particularly reducing starting torque of the magnetic liquid sealing device 100 and reducing energy loss.

Referring to fig. 5 to 8, further, the surface texture 21 may be a plurality of grooves distributed in an array, and the surface shape of the grooves is circular, elliptical, or polygonal such as triangle, quadrangle, or pentagon. By adopting the regular groove shape, the friction torque can be reduced, and the method is suitable for batch production. Preferably, the width of the opening of the groove is larger than the width of the bottom of the groove, so as to facilitate the injection of the magnetic liquid 50 on one hand, and to enable the groove of the surface texture 21 to contain more magnetic liquid 50 on the other hand.

In other embodiments, the surface texture 21 may also be a spiral groove or a plurality of parallel grooves, which encircle the axis of the rotating shaft 20. The section of the groove is trapezoidal, so that the magnetic liquid 50 can be conveniently injected; spiral helicine recess or many parallel arrangement's recess, the groove body that the recess is the whole circle and connects, so not only can reduce friction torque, easily make moreover, be fit for batch production.

The utility model provides a magnetic fluid sealing device 100 has pole shoe 30, pole shoe 30 has utmost point tooth 31, utmost point tooth 31 has just to roof 311 of pivot 20 and the lateral wall 312 that links to each other with roof 311, be formed with chamfer 313 between roof 311 and the lateral wall 312, through form chamfer 313 on utmost point tooth 31, be difficult to fish tail pivot 20 when assembling in one side; on the other hand, the magnetic force applied to the tooth top of the tooth 31 with the chamfer 313 is more uniform than that applied to a rectangular tooth, so that the magnetic particles in the magnetic liquid 50 are less prone to agglomeration, the pressure resistance and the sealing performance of the magnetic liquid sealing device 100 are improved, and the service life of the magnetic liquid sealing device 100 is prolonged.

In the description of the present specification, reference to the description of "some embodiments," "optionally," "further" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides a magnetic liquid sealing device, includes casing, pivot, pole shoe and magnetic liquid, the casing has the appearance chamber, the pivot is fixed in the casing and run through the appearance chamber, the pole shoe has the utmost point tooth, the magnetic liquid adsorb in the utmost point tooth with between the pivot, its characterized in that: the pole teeth are provided with top walls right facing the rotating shaft and side walls connected with the top walls, and chamfers are formed between the top walls and the side walls.

2. The magnetic fluid seal apparatus of claim 1, wherein: the chamfer is an oblique angle or a fillet.

3. The magnetic fluid seal apparatus of claim 2, wherein: the width of the pole teeth is 0.2-1 mm, and the ratio of the distance between two adjacent pole teeth to the width of the pole teeth is 3-5.

4. The magnetic fluid seal apparatus of claim 3, wherein: when the chamfer is the oblique angle, the oblique angle is 30 ~ 60 degrees, and is same two chamfers interval settings of utmost point tooth.

5. The magnetic fluid seal apparatus of claim 3, wherein: when the chamfer is a fillet, the radius of curvature of the fillet is less than or equal to 1/2 of the tooth width.

6. The magnetic fluid seal apparatus of claim 1, wherein: and a surface texture is formed at the position of the outer surface of the rotating shaft, which is opposite to the pole shoe, and the magnetic liquid is adsorbed in the surface texture.

7. The magnetic fluid seal apparatus of claim 6, wherein: the surface texture is a plurality of grooves distributed in an array.

8. The magnetic fluid seal apparatus of claim 6, wherein: the surface texture is a spiral groove or a plurality of grooves arranged in parallel, and the grooves surround the axis of the rotating shaft.

9. The magnetic fluid seal apparatus of claim 8, wherein: the cross section of the groove is trapezoidal, and the width of the opening of the groove is larger than that of the bottom of the groove.

10. The magnetic fluid seal apparatus of any one of claims 1 to 9, wherein: the shell comprises an end cover, and the end cover is detachably fixed at the end part of the accommodating cavity.

Images