CN113847434A - Magnetic liquid sealing device - Google Patents
Magnetic liquid sealing device Download PDFInfo
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- CN113847434A CN113847434A CN202111109197.9A CN202111109197A CN113847434A CN 113847434 A CN113847434 A CN 113847434A CN 202111109197 A CN202111109197 A CN 202111109197A CN 113847434 A CN113847434 A CN 113847434A
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- magnetic liquid
- rotating shaft
- peripheral surface
- outer peripheral
- pole
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention discloses a magnetic liquid sealing device, comprising: the device comprises a shell, a rotating shaft and a rotating shaft, wherein the shell defines a cavity; the pole shoe is sleeved on the rotating shaft and positioned in the cavity, and magnetic liquid for sealing is adsorbed on the tooth top surface of each pole tooth; the permanent magnet is arranged in the cavity and is matched with the pole shoe so as to provide magnetism for the pole shoe; and the shaft sleeve is arranged on the outer peripheral surface of the rotating shaft in a shaft sleeve mode, the outer peripheral surface of the shaft sleeve is opposite to the inner peripheral surface of the pole shoe, the magnetic liquid is located between the outer peripheral surface of the shaft sleeve and the tooth crest surface of the pole teeth, the outer peripheral surface of the shaft sleeve is provided with a plurality of first surfaces and a plurality of second surfaces, the first surfaces and the second surfaces are alternately arranged along the axial direction of the rotating shaft, and the wettability of the magnetic liquid on the first surfaces is higher than that of the magnetic liquid on the second surfaces. The magnetic liquid sealing device provided by the embodiment of the invention has the advantages that the magnetic liquid is not easy to volatilize, so that the sealing effect is enhanced.
Description
Technical Field
The invention relates to the field of sealing devices, in particular to a magnetic liquid sealing device.
Background
Magnetic liquid seals are widely used in more and more industries as a sealing method capable of achieving 'zero leakage'. The working principle is that under the action of magnetic field generated by permanent magnet, the magnetic liquid placed between the shaft and gap at top end of pole tooth is concentrated to form an O-shaped ring, so that the gap channel is blocked to attain the goal of sealing. In the related art, in the reciprocating magnetic liquid seal, the magnetic liquid in the seal is brought out in the reciprocating process of the shaft, so that the magnetic liquid in the seal is reduced, and the sealing performance is reduced; in addition, the magnetic liquid carried out usually has a large surface area, so that the volatilization of the base carrier liquid is accelerated, the total amount of the magnetic liquid is reduced, and the service life of the reciprocating magnetic liquid seal is seriously influenced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, embodiments of the present invention provide a magnetic liquid sealing device.
The magnetic liquid sealing device according to the embodiment of the invention comprises:
a housing defining a chamber,
the rotating shaft is rotatably arranged in the cavity and extends into the cavity from one end of the shell and extends out from the other end of the shell;
the pole shoe is sleeved on the rotating shaft and positioned in the cavity, a plurality of pole teeth which are distributed along the axial direction of the rotating shaft are formed on the inner circumferential surface of the pole shoe, a tooth groove is formed between every two adjacent pole teeth, and magnetic liquid for sealing is adsorbed on the tooth top surface of each pole tooth;
the permanent magnet is arranged in the cavity and is matched with the pole shoe so as to provide magnetism for the pole shoe; and
the shaft sleeve is arranged on the outer peripheral surface of the rotating shaft in a sleeved mode, the outer peripheral surface of the shaft sleeve is opposite to the inner peripheral surface of the pole shoe, the magnetic liquid is located between the outer peripheral surface of the shaft sleeve and the tooth crest face of the pole tooth, the outer peripheral surface of the shaft sleeve is provided with a plurality of first surfaces and a plurality of second surfaces, the first surfaces and the second surfaces are alternately arranged in the axial direction of the rotating shaft, and the wettability of the magnetic liquid to the first surfaces is higher than that of the magnetic liquid to the second surfaces.
Therefore, the magnetic liquid sealing device according to the embodiment of the invention has the advantages that the magnetic liquid is not easy to volatilize, so that the sealing effect is enhanced.
In some embodiments, the contact angle of the magnetic liquid with the first surface is greater than or equal to 0 ° and less than or equal to 90 °, and the contact angle of the magnetic liquid with the second surface is greater than 90 ° and less than or equal to 180 °.
In some embodiments, each of the first surfaces is located between two adjacent second surfaces in an axial direction of the rotation shaft.
In some embodiments, the edges of the first surface are connected with two adjacent second surfaces.
In some embodiments, the shaft sleeve has first and second ends opposite to each other in an axial direction of the rotating shaft, at least one of the second surfaces is located between the first end and the pole shoe in the axial direction of the rotating shaft, and at least one of the second surfaces is located between the second end and the pole shoe in the axial direction of the rotating shaft.
In some embodiments, a length of each of the first surfaces in the axial direction of the rotating shaft is greater than a distance between two adjacent teeth of the pole shoe in the axial direction of the rotating shaft, and a length of each of the second surfaces in the axial direction of the rotating shaft is greater than a distance between two adjacent teeth of the pole shoe in the axial direction of the rotating shaft.
In some embodiments, the length ratio of each of the first surfaces to each of the second surfaces in the axial direction of the rotation axis is (0.1-10): 1.
in some embodiments, a ratio of total lengths of the plurality of first surfaces and the plurality of second surfaces in the axial direction of the rotation axis is (0.1-10): 1.
in some embodiments, the outer circumferential surface of the sleeve is formed into a plurality of the first and second surfaces by machining;
or, spraying a plurality of first coatings on the outer peripheral surface of the shaft sleeve to form a plurality of first surfaces, and spraying a plurality of second coatings on the outer peripheral surface of the shaft sleeve to form a plurality of second surfaces;
or the outer peripheral surface of the shaft sleeve is sleeved with a surface film, and the outer peripheral surface of the surface film is provided with a first surface and a second surface.
In some embodiments, the shaft sleeve and the pole piece are both of magnetically conductive material.
Drawings
Fig. 1 is a schematic view of a magnetic liquid sealing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic view of a pole piece and shaft sleeve according to an embodiment of the invention.
Fig. 3 is a schematic diagram of the distribution of magnetic fluid on a sleeve outside a chamber according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A magnetic liquid sealing apparatus 100 according to an embodiment of the present invention is described below with reference to the drawings. As shown in fig. 1 to 3, a magnetic fluid sealing apparatus 100 according to an embodiment of the present invention includes a housing 1, a rotating shaft 2, a pole piece 3, a permanent magnet 5, and a shaft sleeve 6.
The housing 1 defines a chamber 11. The rotating shaft 2 is rotatably arranged in the chamber 11, and the rotating shaft 2 extends into the chamber 11 from one end of the shell 1 and extends out from the other end of the shell 1. The pole shoe 3 is sleeved on the rotating shaft 2 and located in the cavity 11, and a plurality of pole teeth 31 arranged along the axial direction of the rotating shaft 2 are formed on the inner circumferential surface 303 of the pole shoe 3. A tooth groove 32 is formed between two adjacent pole teeth 31, and the magnetic liquid 4 for sealing is adsorbed on the top surface 311 of each pole tooth 31. Permanent magnets 5 are provided in the chamber 11, the permanent magnets 5 cooperating with the pole pieces 3 to provide magnetic forces to the pole pieces 3.
The sleeve 6 is provided on the outer peripheral surface 201 of the rotating shaft 2, the outer peripheral surface 601 of the sleeve 6 is provided opposite to the inner peripheral surface 303 of the pole piece 3, and the magnetic liquid 4 is located between the outer peripheral surface 301 of the sleeve 6 and the tooth crest 311 of the tooth 31. The outer peripheral surface 601 of the sleeve 6 has a plurality of first surfaces 61 and a plurality of second surfaces 62, the plurality of first surfaces 61 and the plurality of second surfaces 62 are alternately arranged in the axial direction of the rotating shaft 2, and the wettability of the magnetic liquid 4 to the first surfaces 61 is higher than the wettability of the magnetic liquid 4 to the second surfaces 62.
The magnetic liquid sealing device 100 according to the embodiment of the present invention is configured such that the plurality of first surfaces 61 and the plurality of second surfaces 62 are provided on the outer peripheral surface 601 of the sleeve 6, and the wettability of the magnetic liquid 4 to the first surface 61 is higher than the wettability of the magnetic liquid 4 to the second surface 62. That is, the magnetic liquid 4 has a good wettability to the first surface 61, and the magnetic liquid 4 has a poor wettability to the second surface 62. Therefore, the magnetic liquid 4 is more easily spread and attached on the first surface 61 than on the second surface 62.
If the magnetic liquid 4 on one tooth 31 comes into contact with a first surface 61 at the start of the reciprocation of the rotary shaft 2 during the reciprocation of the rotary shaft 2 along the axial direction thereof, the magnetic liquid 4 on the one tooth 31 tends to spread and adhere to the first surface 61 during the reciprocation. If the magnetic liquid 4 on one tooth 31 contacts with a second surface 62 at the beginning of the reciprocating motion of the rotating shaft 2, the magnetic liquid 4 on the one tooth 31 is not easily spread and attached on the second surface 62 and contacts with the first surface 61 along with the movement of the shaft sleeve 6 during the reciprocating motion, so that the magnetic liquid 4 on the one tooth 31 is spread and attached on the first surface 61.
As the rotating shaft 2 reciprocates along its axial direction, a part of the magnetic liquid 4 reaches the outside of the chamber 11 along with the sleeve 6 and comes into contact with the outside. The plurality of first surfaces 61 and the plurality of second surfaces 62 are alternately arranged in the axial direction of the rotating shaft 2 so that the portion of the magnetic liquid 4 is in contact with at least one of the first surfaces 61 and the second surfaces 62. The magnetic liquid 4 has a better wettability for the first surface 61 and the magnetic liquid 4 has a poorer wettability for the second surface 62. So that the first part of the magnetic liquid 4 is easy to spread and adhere on the first surface 61 after contacting with the first surface 61. The second part of the magnetic liquid 4 is not easily spread and attached on the second surface 62 after contacting the second surface 62, and contacts the first surface 61 along with the movement of the shaft sleeve 6, so that the second part of the magnetic liquid 4 is also easily spread and attached on the first surface 61. That is, as the shaft sleeve 6 reaches the outside of the chamber 11, the part of the magnetic liquid 4 is easy to spread and adhere to the first surface 61 reaching the outside of the chamber 11, and is not easy to spread and adhere to the second surface 62 reaching the outside of the chamber 11, so that the area of the part of the magnetic liquid 4 exposed to the outside is reduced, and the volatilization amount of the part of the magnetic liquid 4 is reduced. And the part of the magnetic liquid 4 is returned to the chamber 11 to continue to play a sealing role, thereby enhancing the sealing effect of the magnetic liquid sealing device 100.
Therefore, the magnetic liquid sealing apparatus 100 according to the embodiment of the present invention has an advantage that the magnetic liquid 4 is less likely to volatilize, thereby enhancing the sealing effect.
As shown in fig. 1 to 3, a magnetic fluid sealing apparatus 100 according to an embodiment of the present invention includes a housing 1, a rotating shaft 2, a pole piece 3, a permanent magnet 5, and a shaft sleeve 6.
As shown in fig. 1, the housing 1 defines a chamber 11. Specifically, the housing 1 also has a first opening 12 and a second opening 13, the first opening 12 and the second opening 13 communicating with the chamber 11. The chamber 11 is a cylindrical cavity, the chamber 11 extends along the axial direction of the rotating shaft 2, and the first opening 12 and the second opening 13 are located on two sides of the chamber 11 along the axial direction of the rotating shaft 2. For example, the axial direction of the rotating shaft 2 is the left-right direction, and the first opening 12 and the second opening 13 are located on both sides of the chamber 11 in the left-right direction, as indicated by an arrow a in fig. 1.
As shown in fig. 1, the shaft 2 is rotatably disposed in the chamber 11, and the shaft 2 extends into the chamber 11 from one end of the housing 1 and extends from the other end of the housing 1. For example, the rotary shaft 2 extends into the chamber 11 from the left end of the housing 1 and extends from the right end of the housing 1, and the rotary shaft 2 can reciprocate in the left-right direction in the chamber 11.
The pole shoe 3 is sleeved on the rotating shaft 2 and located in the cavity 11, and a plurality of pole teeth 31 arranged along the axial direction of the rotating shaft 2 are formed on the inner circumferential surface 303 of the pole shoe 3. A tooth groove 32 is formed between two adjacent pole teeth 31, and the magnetic liquid 4 for sealing is adsorbed on the top surface 311 of each pole tooth 31. The pole shoe 3 can be provided in plurality, and the plurality of pole shoes 3 are arranged along the axial direction of the rotating shaft 2. For example, the pole piece 3 is annular, and a plurality of annular pole teeth 31 arranged in the left-right direction are formed on the inner circumferential surface 303 of the pole piece 3. Adjacent two pole teeth 31 of the pole shoe 3 form a tooth slot 32 therebetween, and the plurality of tooth slots 32 are arranged in the left-right direction.
As shown in fig. 1, in some embodiments, the pole piece 3 includes a first pole piece 301 and a second pole piece 302, and the first pole piece 301 and the second pole piece 302 are located at both ends of the permanent magnet 5 in the axial direction of the rotating shaft 2 and connected to the permanent magnet 5. For example, the first pole piece 301 is located at the left end of the permanent magnet 5, and the second pole piece 302 is located at the right end of the permanent magnet 5, so that the permanent magnet 5 provides magnetic force to the first pole piece 301 and the second pole piece 302, so that the magnetic liquid 4 for sealing can be adsorbed on the tooth top surface 311 of the pole teeth 31 of the first pole piece 301 and the second pole piece 302.
As shown in fig. 1, the sleeve 6 is provided on the outer peripheral surface 201 of the rotating shaft 2, the outer peripheral surface 601 of the sleeve 6 and the inner peripheral surface 303 of the pole piece 3 are provided to face each other in the radial direction of the rotating shaft 2, and the magnetic liquid 4 is located between the outer peripheral surface 301 of the sleeve 6 and the tooth crest 311 of the pole tooth 31. Thereby, the sleeve 6 can rotate with the rotary shaft 2 and reciprocate in the axial direction of the rotary shaft 2. And the magnetic liquid 4 between the outer circumferential surface 301 of the shaft sleeve 6 and the inner circumferential surface 303 of the pole piece 3 can play a role in sealing, so that the normal work of the magnetic liquid sealing device 100 is ensured.
As shown in fig. 1, the outer peripheral surface 601 of the sleeve 6 has a plurality of first surfaces 61 and a plurality of second surfaces 62, and the plurality of first surfaces 61 and the plurality of second surfaces 62 are alternately arranged in the axial direction of the rotating shaft 2. For example, the plurality of first surfaces 61 and the plurality of second surfaces 62 are alternately arranged in the left-right direction.
The wettability of the magnetic liquid 4 at the first surface 61 is higher than the wettability of the magnetic liquid 4 at the second surface 62. That is, the magnetic liquid 4 has a better wettability on the first surface 61, and the magnetic liquid 4 has a poorer wettability on the second surface 62. That is, the magnetic liquid 4 is more easily spread and attached on the first surface 61 than on the second surface 62.
In some embodiments, the contact angle of the magnetic liquid 4 with the first surface 61 is 0 ° or more and 90 ° or less. A contact angle of 0 ° between the magnetic liquid 4 and the outer peripheral surface 601 of the sleeve 6 indicates that the magnetic liquid 4 can completely wet the outer peripheral surface 601 of the sleeve 6. A contact angle of the magnetic liquid 4 with the outer peripheral surface 601 of the sleeve 6 being greater than 0 ° and equal to or less than 90 ° means that the magnetic liquid 4 can wet the outer peripheral surface 601 of the sleeve 6, and the smaller the contact angle of the magnetic liquid 4 with the outer peripheral surface 601 of the sleeve 6, the better the wettability of the magnetic liquid 4 with the outer peripheral surface 601 of the sleeve 6.
The contact angle of the magnetic liquid 4 with the second surface 62 is greater than 90 ° and equal to or less than 180 °. The contact angle of the magnetic liquid 4 with the outer peripheral surface 601 of the sleeve 6 is larger than 90 ° and smaller than 180 ° indicating that the wettability of the magnetic liquid 4 with the outer peripheral surface 601 of the sleeve 6 is poor, and the larger the contact angle of the magnetic liquid 4 with the outer peripheral surface 601 of the sleeve 6 is, the poorer the wettability of the magnetic liquid 4 with the outer peripheral surface 601 of the sleeve 6 is. The contact angle of the magnetic liquid 4 with the outer peripheral surface 601 of the sleeve 6 of 180 ° means that the magnetic liquid 4 does not wet the outer peripheral surface 601 of the sleeve 6 at all, and the magnetic liquid 4 is agglomerated into a sphere on the outer peripheral surface 601 of the sleeve 6.
The contact angle between the magnetic liquid 4 and the first surface 61 is 0 ° or more and 90 ° or less, that is, the first surface 61 has good wettability, and the magnetic liquid 4 is easily spread and attached to the first surface 61. The contact angle between the magnetic liquid 4 and the second surface 62 is greater than 90 ° and equal to or less than 180 °, that is, the first surface 61 is a surface with poor wettability, and the magnetic liquid 4 is difficult to spread and adhere to the first surface 61.
If the magnetic liquid 4 on one tooth 31 comes into contact with a first surface 61 at the start of the reciprocation of the rotary shaft 2 during the reciprocation of the rotary shaft 2 along the axial direction thereof, the magnetic liquid 4 on the one tooth 31 tends to spread and adhere to the first surface 61 during the reciprocation. If the magnetic liquid 4 on one tooth 31 contacts with a second surface 62 at the beginning of the reciprocating motion of the rotating shaft 2, the magnetic liquid 4 on the one tooth 31 is not easily spread and attached on the second surface 62 and contacts with the first surface 61 along with the movement of the shaft sleeve 6 during the reciprocating motion, so that the magnetic liquid 4 on the one tooth 31 is spread and attached on the first surface 61. So that the part of magnetic liquid 4 reaching the outside of the chamber 11 along with the shaft sleeve 6 is easy to spread and adhere to the first surface 61 reaching the outside of the chamber 11 and is difficult to spread and adhere to the second surface 62 reaching the outside of the chamber 11, thereby reducing the exposed area of the part of magnetic liquid 4 and reducing the volatilization amount of the part of magnetic liquid 4. And the part of the magnetic liquid 4 is returned to the chamber 11 to continue to play a sealing role, thereby enhancing the sealing effect of the magnetic liquid sealing device 100.
As shown in fig. 1, in some embodiments, each first surface 61 is located between two adjacent second surfaces 62 in the axial direction of the rotating shaft 2. The faces where the first surface 61 and the second surface 62 exist are differential surfaces. In other words, the differential surface includes the second surface 62, the first surface 61, the second surface 62, the first surface 61 … …, the second surface 62, the first surface 61, and the second surface 62 sequentially arranged along the axial direction of the rotating shaft 2. That is, each first surface 61 is provided with the second surface 62 on both sides in the axial direction of the rotating shaft 2, so that the edge area of the differential surface in the axial direction of the rotating shaft 2 is the second surface 62. Therefore, the distance from the chamber 11 of the part of the magnetic liquid 4 to the outside of the chamber 11 along with the shaft sleeve 6 can be reduced, and the time for exposing and volatilizing the part of the magnetic liquid 4 outside the chamber 11 can be further reduced, so that the volatilization amount of the part of the magnetic liquid 4 can be further reduced. For example, each first surface 61 is located between two adjacent second surfaces 62 in the left-right direction, the left edge area of the differential surface is the second surface 62, and the right edge area of the differential surface is the second surface 62. So that the magnetic liquid 4 is not easily located in the left and right edge regions of the differential surface on the outer circumferential surface of the sleeve 6.
In some embodiments, the edges of the first surface 61 are each connected to two adjacent second surfaces 62. That is, the first surface 61 and the second surface 62 are connected without a gap therebetween, so that an area of the outer circumferential surface of the shaft sleeve 6 covering the first surface 61 and the second surface 62 is free from the presence of the third surface so that the magnetic liquid 4 easily reaches and spreads and adheres to the first surface 61 during the reciprocating motion of the rotary shaft 2, thereby reducing the exposed area of the magnetic liquid 4.
As shown in fig. 1, in some embodiments, the bushing 6 has a first end 63 and a second end 64 opposite in the axial direction of the rotating shaft 2. The at least one second surface 62 is located between the first end 63 and the pole piece 3 in the axial direction of the shaft 2, and the at least one second surface 62 is located between the second end 64 and the pole piece 3 in the axial direction of the shaft 2. That is, at least one second surface 62 adjacent to the first end 63 is located between the first end 63 and the pole piece 3, and at least one second surface 62 adjacent to the second end 64 is located between the second end 64 and the pole piece 3 in the axial direction of the rotating shaft 2. So that the second surfaces 62 of the differential surfaces at both axial ends of the shaft 2 are always located outside the ends of the pole pieces 3 during reciprocation of the shaft 2. I.e. during the reciprocating movement of the shaft 2, the pole pieces 3 are always in contact with the differential surfaces, thus ensuring that more magnetic liquid 4 can adhere to the first surface 61. For example, the first end 63 is a left end of the boss 6, and the second end 64 is a right end of the boss 6. During the reciprocating motion of the rotating shaft 2 in the left-right direction, the second surface 62 of the left edge area of the differential surface is positioned between the first end 63 and the first pole piece 301 in the left-right direction; the second surface 62 of the differential surface right edge region is located between the second end 64 and the second pole piece 302 in the left-right direction.
In some embodiments, the partial ends of the second surface 62 covering the first surface 61 and the second surface 62 at both ends of the shaft 2 in the axial direction form a first end 63 and a second end 64, respectively, and the first end 63 and the second end 64 are located outside the chamber 11 during the reciprocation of the shaft 2, so that the pole piece 3 is always in contact with the differential surfaces, thereby ensuring that more magnetic liquid 4 can be adhered to the first surface 61.
In some embodiments, the length of each first surface 61 in the axial direction of the rotating shaft 2 is greater than the distance between two adjacent pole teeth 31 of the pole shoe 3 in the axial direction of the rotating shaft 2, for example, the length of each first surface 61 in the left-right direction is greater than the distance between two adjacent pole teeth 31 of each pole shoe 3 in the axial direction of the rotating shaft 2, so that the first surface 61 has a surface area sufficient for adsorbing the magnetic liquid 4 to adsorb the magnetic liquid 4 on at least one pole tooth 31, thereby preventing the magnetic liquid 4 on one pole tooth 31 from covering multiple first surfaces 61 and multiple second surfaces 62 at the same time.
The length of each second surface 62 in the axial direction of the rotating shaft 2 is greater than the distance between two adjacent pole teeth 31 of the pole shoe 3 in the axial direction of the rotating shaft 2. For example, the length of each second surface 62 in the left-right direction is greater than the distance between two adjacent pole teeth 31 of each pole shoe 3 in the axial direction of the rotating shaft 2, and the second surface 62 has a predetermined surface area, so that the exposed area of the magnetic liquid 4 can be sufficiently reduced, thereby effectively reducing the volatilization amount of the magnetic liquid 4 and ensuring the sealing performance of the magnetic liquid sealing device 100.
In some embodiments, the length ratio of each first surface 61 and each second surface 62 in the axial direction of the rotating shaft 2 is (0.1-10): 1. for example, the length ratio of each first surface 61 and each second surface 62 in the left-right direction is 2: 1. so that the first surface 61 adsorbs enough surface area to adsorb the magnetic liquid 4, i.e. the outer circumferential surface 601 of the shaft sleeve 6 and the inner circumferential surface 303 of the pole piece 3 have enough magnetic liquid, thereby ensuring the sealing performance of the magnetic liquid sealing device 100.
In some embodiments, the ratio of the total length of the first surfaces 61 to the second surfaces 62 in the axial direction of the rotating shaft 2 is (0.1-10): 1. for example, the total length ratio of the plurality of first surfaces 61 and the plurality of second surfaces 62 in the left-right direction is 2: 1. so that the outer peripheral surface 601 of the shaft sleeve 6 still has enough surface area to adsorb the magnetic liquid 4 in the case of only one first surface 61, i.e. the outer peripheral surface 601 of the shaft sleeve 6 and the inner peripheral surface 303 of the pole piece 3 have enough magnetic liquid, so that the sealing performance of the magnetic liquid sealing device 100 is ensured.
In some embodiments, the outer peripheral surface 601 of the sleeve 6 is formed by machining a plurality of first surfaces 61 and second surfaces 62. Specifically, the outer peripheral surface 601 of the sleeve 6 is formed with a plurality of first surfaces 61 and second surfaces 62 by mechanical precision machining so that the wettability of the magnetic liquid 4 to the first surface 61 is higher than the wettability of the magnetic liquid 4 to the second surface 62.
In some embodiments, the outer circumferential surface of the sleeve 6 is sprayed with a plurality of first coatings to form a plurality of first surfaces 61, and the outer circumferential surface of the sleeve 6 is sprayed with a plurality of second coatings to form a plurality of second surfaces 62. Specifically, the wettability of the magnetic liquid 4 on the first surface 61 formed by the first coating layer is good, and the wettability of the magnetic liquid 4 on the second surface 62 formed by the second coating layer is good, so that the wettability of the magnetic liquid 4 on the first surface 61 is higher than the wettability of the magnetic liquid 4 on the second surface 62. Taking a water-based magnetic liquid as an example, plating nickel on a metal surface can obtain a first surface 61 with a water contact angle less than 10 °, plating a copper-nickel coating on the metal surface, and performing hydrophobic treatment to obtain a second surface 62 with a water contact angle exceeding 120 °, wherein the difference of the contact angles enables the water-based magnetic liquid to gather and expand on the first surface 61.
In some embodiments, the outer circumferential surface of the sleeve 6 is covered with a surface film having a first surface 61 and a second surface 62 on the outer circumferential surface. The surface film is provided around the outer peripheral surface of the sleeve 6 so as to form a first surface 61 and a second surface 62 of the outer peripheral surface of the sleeve 6, and the wettability of the magnetic liquid 4 to the first surface 61 is higher than the wettability of the magnetic liquid 4 to the second surface 62.
Alternatively, the bushing 6 is integrally formed with the rotary shaft 2.
In some embodiments, the shaft sleeve 6 and the pole shoe 3 are both made of magnetically conductive material, i.e. both the shaft sleeve 6 and the pole shoe 3 are magnetically conductive. So that the magnetic liquid 4 can be adsorbed between the tooth crest 311 of the teeth 31 of the pole piece 3 and the outer peripheral surface 601 (the first surface 61 and the second surface 62) of the shaft sleeve 6 when the magnetic liquid 4 is located between the shaft sleeve 6 and the pole piece 3.
As shown in fig. 2 and 3, when the shaft sleeve 6 is made of a magnetic conductive material, the magnetic liquid 4 in the chamber 11 can be adsorbed between the tooth top surface 311 and the first surface 61 and the second surface 62; the magnetic liquid 4 outside the chamber 11 can be adsorbed on the first surface 61, and the magnetic liquid 4 is not adsorbed on the second surface 62 outside the chamber 11.
When the shaft sleeve 6 is made of a non-magnetic material, the magnetic liquid 4 in the cavity 11 can be adsorbed between the tooth crest 311 and the first surface 61, and the magnetic liquid 4 is not adsorbed on the second surface 62 in the cavity 11; the magnetic liquid 4 outside the chamber 11 can be adsorbed on the first surface 61, and the magnetic liquid 4 is not adsorbed on the second surface 62 outside the chamber 11.
Therefore, the shaft sleeve 6 and the pole piece 3 are made of magnetic conductive materials, so that the magnetic liquid 4 can be absorbed between the tooth top surface 311 of the pole tooth 31 and the second surface 62, and the sealing performance of the magnetic liquid sealing device 100 is further improved.
In the description of the present invention, it is to be understood that the terms "central," "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 are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A magnetic fluid seal assembly, comprising:
a housing defining a chamber,
the rotating shaft is rotatably arranged in the cavity and extends into the cavity from one end of the shell and extends out from the other end of the shell;
the pole shoe is sleeved on the rotating shaft and positioned in the cavity, a plurality of pole teeth which are distributed along the axial direction of the rotating shaft are formed on the inner circumferential surface of the pole shoe, a tooth groove is formed between every two adjacent pole teeth, and magnetic liquid for sealing is adsorbed on the tooth top surface of each pole tooth;
the permanent magnet is arranged in the cavity and is matched with the pole shoe so as to provide magnetism for the pole shoe; and
the shaft sleeve is arranged on the outer peripheral surface of the rotating shaft in a sleeved mode, the outer peripheral surface of the shaft sleeve is opposite to the inner peripheral surface of the pole shoe, the magnetic liquid is located between the outer peripheral surface of the shaft sleeve and the tooth crest face of the pole tooth, the outer peripheral surface of the shaft sleeve is provided with a plurality of first surfaces and a plurality of second surfaces, the first surfaces and the second surfaces are alternately arranged in the axial direction of the rotating shaft, and the wettability of the magnetic liquid to the first surfaces is higher than that of the magnetic liquid to the second surfaces.
2. The magnetic liquid sealing device according to claim 1, wherein a contact angle of the magnetic liquid with the first surface is 0 ° or more and 90 ° or less, and a contact angle of the magnetic liquid with the second surface is 180 ° or more and 90 ° or less.
3. The magnetic liquid seal device according to claim 2, wherein each of the first surfaces is located between two adjacent second surfaces in an axial direction of the rotating shaft.
4. The magnetic fluid seal apparatus of claim 3, wherein the edges of said first surface are each connected to two adjacent said second surfaces.
5. The magnetic fluid seal of claim 2 wherein said bushing has first and second axially opposite ends of said shaft, at least one of said second surfaces being axially between said first end and said pole piece, and at least one of said second surfaces being axially between said second end and said pole piece.
6. The magnetic fluid seal apparatus according to claim 2, wherein a length of each of the first surfaces in the axial direction of the rotating shaft is greater than a distance between two adjacent teeth of the pole shoe in the axial direction of the rotating shaft, and a length of each of the second surfaces in the axial direction of the rotating shaft is greater than a distance between two adjacent teeth of the pole shoe in the axial direction of the rotating shaft.
7. The magnetic-liquid sealing device according to claim 2, wherein a length ratio of each of the first surfaces to each of the second surfaces in the axial direction of the rotating shaft is (0.1-10): 1.
8. the magnetic liquid seal device according to claim 2, wherein a total length ratio of the plurality of first surfaces to the plurality of second surfaces in the axial direction of the rotation shaft is (0.1-10): 1.
9. the magnetic liquid seal device according to claim 2, wherein the outer peripheral surface of the sleeve is formed with a plurality of the first surfaces and the second surfaces by machining;
or, spraying a plurality of first coatings on the outer peripheral surface of the shaft sleeve to form a plurality of first surfaces, and spraying a plurality of second coatings on the outer peripheral surface of the shaft sleeve to form a plurality of second surfaces;
or the outer peripheral surface of the shaft sleeve is sleeved with a surface film, and the outer peripheral surface of the surface film is provided with a first surface and a second surface.
10. The magnetic fluid seal apparatus of claim 2 wherein said shaft sleeve and said pole piece are both of magnetically permeable material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111109197.9A CN113847434A (en) | 2021-09-22 | 2021-09-22 | Magnetic liquid sealing device |
| CN202111616094.1A CN114165596B (en) | 2021-09-22 | 2021-12-27 | Magnetic liquid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111109197.9A CN113847434A (en) | 2021-09-22 | 2021-09-22 | Magnetic liquid sealing device |
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| Publication Number | Publication Date |
|---|---|
| CN113847434A true CN113847434A (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111109197.9A Pending CN113847434A (en) | 2021-09-22 | 2021-09-22 | Magnetic liquid sealing device |
| CN202111616094.1A Active CN114165596B (en) | 2021-09-22 | 2021-12-27 | Magnetic liquid sealing device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111616094.1A Active CN114165596B (en) | 2021-09-22 | 2021-12-27 | Magnetic liquid sealing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101377985B (en) * | 2007-08-31 | 2012-08-22 | 湖南维格磁流体股份有限公司 | Dynamic sealing device for middle/high voltage power switchgear |
| CN106545658B (en) * | 2016-12-29 | 2018-01-02 | 北京交通大学 | Magnetic fluid seal device magnetic liquid teeth groove injection method |
| CN112049937B (en) * | 2020-09-08 | 2021-05-18 | 清华大学 | Double-coating magnetic liquid sealing device |
| CN112178203B (en) * | 2020-10-21 | 2021-05-14 | 清华大学 | Magnetic liquid sealing device |
| CN112728104B (en) * | 2020-12-31 | 2022-03-04 | 清华大学 | Magnetic liquid sealing device with pole teeth filled with porous material |
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- 2021-09-22 CN CN202111109197.9A patent/CN113847434A/en active Pending
- 2021-12-27 CN CN202111616094.1A patent/CN114165596B/en active Active
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| CN114165596A (en) | 2022-03-11 |
| CN114165596B (en) | 2023-03-03 |
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