CN112728106B - Magnetic liquid sealing device for sealing liquid - Google Patents

Abstract

The embodiment of the invention provides a magnetic liquid sealing device for sealing liquid, which is provided with a magnetic liquid supplement piece, wherein magnetic particles capable of forming new magnetic liquid are adsorbed on a first end of the magnetic liquid supplement piece, when leaked sealed liquid is contacted with the magnetic particles on the first end, a control system controls the magnetic liquid supplement piece to be rapidly heated to reach the temperature required by preparation of the magnetic liquid, the magnetic particles adsorbed on the first end fall off from the first end due to the contact of the sealed liquid, and are uniformly dispersed into the sealed liquid under the action of high temperature and continuous rotation and stirring of a rotating shaft, so that the new magnetic liquid is formed. The newly generated magnetic liquid can be supplemented to the tooth crest surface of the polar tooth losing the magnetic liquid, so that the sealing performance of the polar tooth can be recovered as soon as possible, and therefore, the magnetic liquid sealing device is quicker in recovery of the sealing performance and higher in reliability.

Description

Magnetic liquid sealing device for sealing liquid

Technical Field

The invention relates to the field of sealing devices, in particular to a magnetic liquid sealing device for sealing liquid.

Background

The magnetic liquid sealing device has the advantages of zero leakage, no abrasion, long service life, simple structure and the like, and is used by more and more industries. However, when the magnetic liquid sealing device is used for sealing liquid, once a seal at a certain position fails, the sealed liquid medium will leak and generate "scouring" or "seepage" to the magnetic liquid, the magnetic liquid will be lost along with the leakage of the sealed liquid medium, so that the loss of the magnetic liquid is caused, the self-repairing performance of the magnetic liquid will be greatly influenced, the seal fails in a serious case, and the seal life of the magnetic liquid will be reduced.

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.

A magnetic fluid seal apparatus for sealing fluid according to an embodiment of the present invention includes a shaft housing defining a chamber; the sealing cavity is connected with one end of the shaft shell and defines a sealing cavity for containing sealed liquid; the rotating shaft is rotatably arranged in the cavity; the pole shoe is sleeved on the rotating shaft, 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 first gap is formed between the tooth top surface of each pole tooth and the circumferential surface of the rotating shaft, magnetic liquid for sealing can be adsorbed on the tooth top surface of each pole tooth, and the magnetic liquid can be filled in the first gap; the permanent magnet is sleeved on the rotating shaft and matched with the pole shoe so as to provide magnetic force for the pole shoe; and a magnetic liquid supplement, the magnetic liquid supplement having a first end and a second end opposite to each other in a radial direction of the rotating shaft, the first end being opposite to the circumferential surface of the rotating shaft and having a second gap therebetween, the first end being located between two adjacent pole teeth or two adjacent pole shoes in an axial direction of the rotating shaft, the first end being capable of adsorbing magnetic particles thereon, the magnetic particles being capable of being located in the second gap, the magnetic liquid supplement being capable of being heated, the magnetic liquid supplement being magnetically isolated from the pole shoes, each of the magnetic liquid supplement, the pole shoes and the permanent magnets being located in the chamber; and a control system capable of controlling heating of the magnetic liquid supplement.

According to the magnetic liquid sealing device for sealing liquid provided by the embodiment of the invention, the magnetic liquid supplement piece is provided, magnetic particles capable of forming new magnetic liquid are adsorbed on the first end of the magnetic liquid supplement piece, and when (part of) the magnetic liquid adsorbed on the pole teeth on one side of the magnetic liquid supplement piece is firstly washed and infiltrated to be separated from the pole teeth due to leakage of the sealed liquid, the sealing performance of the pole teeth is failed due to loss of the magnetic liquid. When the leaked sealed liquid continuously permeates outwards along the axial direction of the rotating shaft and is contacted with the magnetic particles on the first end, the control system controls the magnetic liquid supplement piece to be rapidly heated to reach the temperature required by the preparation of the magnetic liquid, the magnetic particles adsorbed on the first end fall off from the first end due to the contact of the sealed liquid, and are uniformly dispersed into the sealed liquid under the action of high temperature and continuous rotating and stirring of the rotating shaft, so that new magnetic liquid is formed. The newly generated magnetic liquid can be replenished to the tooth crest of the pole tooth which loses (part of) the magnetic liquid, so that the sealing performance of the pole tooth positioned on the side of the magnetic liquid replenishing piece is recovered as soon as possible. The pole teeth positioned on the other side of the magnetic liquid supplementing piece can ensure that the sealing of the sealing device does not completely lose efficacy, and the sealing effect of the magnetic liquid sealing device is ensured.

Compared with the self-repairing method only depending on the magnetic liquid adsorbed on the pole teeth, the magnetic liquid sealing device provided by the embodiment of the invention has the capability of supplementing the magnetic liquid, so that the sealing performance is recovered more quickly and the reliability is higher.

In addition, as the generation of new magnetic liquid can consume the leaked sealed liquid, the contact between the leaked sealed liquid and the magnetic liquid in the first gap can be avoided, the interface instability phenomenon is caused, and the sealing reliability of the magnetic liquid sealing device is improved.

Therefore, the magnetic liquid sealing device for sealing liquid provided by the embodiment of the invention has the advantages of high reliability and quicker self-repairing.

In addition, the magnetic liquid sealing device according to the present invention has the following additional technical features:

in some embodiments, the magnetic liquid supplement is a resistance wire, the resistance wire is arranged in the pole shoe, and a first end of the resistance wire is located in the tooth groove between the two adjacent pole teeth in the axial direction of the rotating shaft.

In some embodiments, the resistance wire includes a plurality of resistance wires, and the plurality of resistance wires are arranged at intervals in the circumferential direction of the rotating shaft.

In some embodiments, the magnetic fluid seal further comprises a pressure sensor, the sensing end of the pressure sensor being located within the tooth slot.

In some embodiments, the adjacent two pole teeth include a first pole tooth and a second pole tooth, the first pole tooth is located between the second pole tooth and the seal cavity in the axial direction of the rotating shaft, and the distance from the first end of the resistance wire to the first pole tooth in the axial direction of the rotating shaft is smaller than the distance from the first end of the resistance wire to the second pole tooth in the axial direction of the rotating shaft.

In some embodiments, the pole shoe is provided with a through hole extending along a radial direction of the rotating shaft, the resistance wire is fitted in the through hole, and the magnetic liquid sealing device further comprises a magnetic isolation sleeve which is sleeved on a side wall surface of the through hole or sleeved on the resistance wire.

In some embodiments, the pole pieces comprise two, and the magnetic liquid supplement is a resistive sheet sandwiched between the two pole pieces.

In some embodiments, the magnetic liquid sealing device further includes a first magnetic shielding sheet and a second magnetic shielding sheet, and the resistor disc is sandwiched between the first magnetic shielding sheet and the second magnetic shielding sheet in the axial direction of the rotating shaft.

In some embodiments, the first end has a magnetic property that is less than a magnetic property of the tooth.

In some embodiments, the second gap is greater than the first gap.

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

Fig. 1 is a schematic structural diagram of a magnetic fluid sealing device according to a first embodiment of the present invention.

Figure 2 is a schematic view of the pole piece of figure 1.

Figure 3 is another schematic view of the pole piece of figure 1.

Fig. 4 is a partially enlarged schematic view of fig. 2.

FIG. 5 is a schematic view of a magnetic fluid supplement according to the first embodiment.

FIG. 6 is a schematic view of another magnetic liquid supplement in accordance with one embodiment.

Reference numerals:

magnetic fluid seal device 100, shaft housing 110; a chamber 111; a rotating shaft 120; a pole piece 130; the pole teeth 131; gullet 1311; a through hole 132; a magnetic shield 133; a first pole piece 134; a second pole piece 135; a permanent magnet 140; a magnetic liquid supplement 150; a first end 151; a second end 152; a first portion 154; small diameter section 1541; a large diameter section 1542; a second portion 155; a first supplement 156; a second supplement 157; the first cooling jacket 161; a first cooling chamber 1611; a first through-hole 1612; a second cooling jacket 162; a second cooling chamber 1621; a second via 1622; a first bearing 171; a second bearing 172; a first sleeve 181; a second sleeve 182; a first end cap 91; a second end cap 92; a first seal ring 101; a second seal ring 102; a first nut 103; a second nut 104.

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 for sealing liquid according to an embodiment of the present invention is described below with reference to fig. 1 to 6.

Magnetic fluid seal apparatus 100 includes a shaft housing 110, a rotating shaft 120, a pole piece 130, a permanent magnet 140, and a magnetic fluid supplement 150.

The shaft housing 110 defines a chamber 111. The rotation shaft 120 is rotatably disposed in the chamber 111, and the rotation shaft 120 extends into the chamber 111 from one end of the shaft housing 110 and extends from the other end of the shaft housing 110. The pole shoe 130 is sleeved on the rotating shaft 120, a plurality of pole teeth 131 arranged along the axial direction of the rotating shaft 120 are formed on the inner circumferential surface of the pole shoe 130, a tooth slot 1311 is formed between two adjacent pole teeth 131, and the plurality of pole teeth 131 form a plurality of tooth slots 1311.

A first gap is formed between the tooth top surface of each tooth 131 and the circumferential surface of the rotating shaft 120, and a magnetic liquid can be adsorbed on the tooth top surface of each tooth 131, and the magnetic liquid is used for sealing. The magnetic liquid can be filled in the first gap. It can be understood that the magnetic liquid is in contact with both the circumferential surface of the rotating shaft 120 and the tooth top surface of the pole teeth 131, so that the magnetic liquid sealing apparatus 100 has a good sealing effect.

The permanent magnet 140 is sleeved on the rotating shaft 120, and the permanent magnet 140 and the pole piece 130 are matched with each other so that the permanent magnet 140 provides magnetic force for the pole piece 130. For example, the permanent magnet 140 abuts against the pole piece 130 to provide the magnetic force of the permanent magnet 140 to the pole piece 130, so that the pole teeth 131 on the pole piece 130 have a magnetic force capable of attracting the magnetic liquid.

The magnetic liquid supplement member 150 has a first end 151 and a second end 152 opposite to each other in a radial direction of the rotation shaft 120, wherein the first end 151 is opposite to a circumferential surface of the rotation shaft 120. That is, the first end 151 of the magnetic liquid supplement 150 is closer to the circumferential surface of the rotation shaft 120 than the second end 152. The first end 151 of the magnetic liquid supplement member 150 has a second gap with the circumferential surface of the rotation shaft 120, i.e., the magnetic liquid supplement member 150 does not contact the rotation shaft 120.

The first end 151 of the magnetic liquid supplement 150 is located between two adjacent pole teeth 131 or between two adjacent pole shoes 130 in the axial direction of the rotating shaft 120. For example, when the magnetic fluid supplement 150 is buried in the pole piece 130 and the first end 151 is located in the tooth slot 1311 between some adjacent two pole teeth 131, the first end 151 is located between the adjacent two pole teeth 131 in the axial direction of the rotating shaft 120. For another example, when the magnetic fluid sealing apparatus 100 includes two pole pieces 130, the magnetic fluid supplement 150 is sandwiched between the two pole pieces 130. This is provided to ensure that the magnetic fluid supplement 150 has at least one pole tooth 131 on both sides in the axial direction of the rotating shaft 120. It should be noted that the magnetic fluid supplement 150 is magnetically isolated from the pole piece 130, that is, the magnetic fluid supplement 150 is in a non-magnetic-conductive relationship with the pole piece 130, so as to ensure that the magnetic fluid supplement 150 does not interact with the pole piece 130, and thus the magnetic field in the magnetic fluid sealing apparatus 100 is not damaged.

The first end 151 of the magnetic liquid supplement 150 can have magnetic particles (not shown) adsorbed thereon, which are located in the second gap. The magnetic particles adsorbed on the magnetic liquid supplement member 150 are used to generate new magnetic liquid to supplement the magnetic liquid lost from the pole teeth 131. The magnetic liquid supplement 150 can be heated because sufficient temperature and sufficient agitation are necessary conditions for the generation of new magnetic liquid. Each of the pole piece 130, the permanent magnet 140, and the magnetic liquid supplement 150 is located within the chamber 111.

The magnetic fluid seal apparatus 100 further comprises a control system connected to the magnetic fluid supplement 150 for controlling the heating of said magnetic fluid supplement 150.

The magnetic liquid sealing apparatus for sealing liquid according to the embodiment of the present invention is provided with a magnetic liquid supplement member 150, and magnetic particles capable of forming new magnetic liquid are adsorbed on a first end of the magnetic liquid supplement member 150. When (part of) the magnetic liquid adsorbed on the teeth 131 on the side of the magnetic liquid supplement 150 is first washed out and infiltrated to be separated from the teeth 131 due to leakage of the sealed liquid, the sealing performance of these teeth 131 will be deteriorated due to the loss of the magnetic liquid. When the leaked sealed liquid continuously penetrates outwards along the axial direction of the rotating shaft 120 and contacts with the magnetic particles on the first end 151, the control system controls the magnetic additional liquid supplement piece 150 to be rapidly heated to reach the temperature required by the preparation of the magnetic liquid, the magnetic particles adsorbed on the first end 151 fall off from the first end 151 due to the contact of the sealed liquid, and are uniformly dispersed into the sealed liquid under the action of high temperature and continuous rotating and stirring of the rotating shaft 120, so that new magnetic liquid is formed. The newly generated magnetic liquid can be replenished onto the tooth top surface of the tooth 131 that has lost (part of) the magnetic liquid, so that the sealing performance of the tooth 131 on the side of the magnetic liquid replenishing member 150 can be recovered as soon as possible. The pole teeth 131 on the other side of the magnetic fluid supplement 150 can ensure that the seal of the sealing device is not completely failed, and the sealing effect of the magnetic fluid sealing device is guaranteed.

Compared with the self-repairing operation only by means of the magnetic liquid adsorbed on the pole teeth 131, the magnetic liquid sealing device provided by the embodiment of the invention has the capability of supplementing the magnetic liquid, so that the sealing performance is recovered more quickly and the reliability is higher.

In addition, as the generation of new magnetic liquid can consume the leaked sealed liquid, the contact between the leaked sealed liquid and the magnetic liquid in the first gap can be avoided, the interface instability phenomenon is caused, and the sealing reliability of the magnetic liquid sealing device is improved.

Therefore, the magnetic liquid sealing device for sealing liquid provided by the embodiment of the invention has the advantages of high reliability and quicker self-repairing.

For convenience of description, the following describes the technical solution by taking the axial direction of the rotating shaft 120 as the left-right direction as an example. The left-right direction is shown by the arrow in fig. 1.

In the embodiment shown in fig. 1, a seal chamber (not shown) for sealing liquid, which defines a seal chamber for containing sealed liquid, is connected to the left end of the shaft housing 110.

In some embodiments, magnetic liquid supplement 150 is a heatable element, i.e., magnetic liquid supplement 150 can be heated to an elevated temperature. The magnetic liquid supplement 150 can promote the generation process of the magnetic liquid by heating, so that the magnetic particles are dispersed in the liquid more uniformly and rapidly to form new magnetic liquid.

The first embodiment is as follows:

in this embodiment, the magnetic liquid supplement 150 is a resistive wire and is provided within the pole piece magnetic liquid supplement 150. As shown in fig. 2 and 3, the pole piece 130 is provided with a through hole 132 extending in a radial direction of the pole piece 130 (the rotating shaft 120). A magnetic liquid supplement 150 is disposed in the through-hole 132. The first end 151 of the magnetic liquid supplement 150 is an inner end closer to the circumferential surface of the rotation shaft 120, and the second end 152 of the magnetic liquid supplement 151 is an outer end away from the rotation shaft 120.

Accordingly, the shaft housing 110 is provided with an opening corresponding to the through hole 132 of the pole piece 130, and the magnetic liquid supplement 150 is connected to an external power supply outside the shaft housing 110 through the through hole 132 and the corresponding opening to heat the magnetic liquid supplement 150.

Optionally, the magnetic liquid supplement 150 has a length greater than the length of the through hole 132. The first end 151 of the magnetic liquid supplement 150 extends out of the pole piece 130 from the inner opening of the through hole 132, and the second end 152 of the magnetic liquid supplement 150 extends out of the pole piece 130 from the outer opening of the through hole 132.

As shown in fig. 5, the second gap is larger than the first gap. The first end 151 is located between the tooth top surface of the tooth 131 and the groove bottom of the tooth groove 1311 in the radial direction of the rotation shaft 120. That is, the first end 151 is located in the tooth groove 1311 formed between two adjacent pole teeth 131, so that the structure of the magnetic fluid sealing apparatus 100 is more reasonable.

It will be appreciated that first end 151 may also be flush with the bottom surface of slot 1311.

As shown in fig. 4, the width of the slot 1311 is wider than the width of the other slots 1311 for more rational design. Preferably, as shown in fig. 4, the magnetic liquid supplement 150 is closer to the tooth 131 on its left side, that is, the distance between the magnetic liquid supplement 150 and the tooth 131 on its left side is smaller than the distance between the magnetic liquid supplement 150 and the tooth 131 on its right side in the axial direction of the rotating shaft 120. The arrangement is such that the generated new magnetic liquid is more easily influenced by the magnetic force of the pole tooth 131 on the left side thereof and is sucked into the pole tooth 131 on the left side.

Alternatively, in order to make the first end 151 of the magnetic liquid supplement member 150 capable of adsorbing the magnetic particles, the first end 151 of the magnetic liquid supplement member 150 needs to be magnetized so that the first end 151 has certain magnetism. The magnetically charged first end 151 has a certain magnetic force to attract the magnetic particles.

It should be noted that the first end 151 has a magnetic strength such that the magnetic particles are attracted thereto, and the magnetic strength thereof is smaller than the magnetic force of the teeth 131 located on both sides thereof, so that the magnetic liquid can be better attracted by the teeth 131 when a new magnetic liquid is formed.

Further, the magnetic liquid supplement member 150 includes a plurality of magnetic liquid supplement members 150, and the plurality of magnetic liquid supplement members 150 are arranged at intervals in the circumferential direction of the rotation shaft 120. As an example, as shown in fig. 3, the magnetic liquid sealing apparatus 100 of the present embodiment includes four magnetic liquid supplements 150. The length direction of each of the four magnetic liquid supplements 150 is along the radial direction of the rotating shaft 120. The four magnetic liquid supplements 150 are uniformly distributed in the circumferential direction of the rotating shaft 120, so that the structure of the magnetic liquid sealing device 100 is more reasonable, and the magnetic liquid sealing device 100 can have stronger capacity of generating new magnetic liquid, so that the self-repairing capacity of the magnetic liquid sealing device 100 is stronger, and the sealing performance is more reliable.

Optionally, the first ends 151 of the four magnetic liquid supplements 150 all extend into the same spline 1311. That is, the four magnetic liquid supplements 150 are flush in the axial direction of the rotating shaft 120. Further alternatively, the slots 1311 are located in the middle of the pole piece 130 in the axial direction of the rotary shaft 120.

For the pole shoe 130, the pole teeth 131 axially to the left of the tooth slot 1311 in the direction of the axis of rotation 120 can be considered as a first stage sealing line. The pole teeth 131 located on the right side of the tooth groove 1311 in the axial direction of the rotary shaft 120 may be regarded as a second stage seal line. Compared with a second-stage sealing defense line, the first-stage sealing defense line is easier to be washed away.

When the first-stage sealing line is subjected to the scouring action of the leaked sealed liquid to cause the sealing failure or the weakening of the sealing effect, the magnetic particles adsorbed on the magnetic liquid supplement piece 150 can contact the leaked sealed liquid to generate new magnetic liquid, and the magnetic liquid is adsorbed on the pole teeth 131 serving as the first-stage sealing line under the action of the magnetic field, so that the sealing effect of the first-stage sealing line is quickly recovered. In the process, the second-stage sealing pay-off line is not influenced by the sealed liquid, so that the good sealing performance is always kept, and the sealing of the magnetic liquid sealing device 100 in the self-repairing process is guaranteed. Since the self-repairing speed of the magnetic liquid sealing device 100 in this embodiment is fast, the pressure on the second-stage sealing line will be reduced, and the sealing reliability is improved.

It should be noted that in other embodiments, the first ends 151 of the magnetic liquid supplements 150 may also respectively extend into different slots 1311, so as to divide the pole teeth 131 on the pole shoe 130 into multiple stages of sealing lines in the axial direction of the rotating shaft 120. For example, the magnetic liquid supplements 150 include a plurality of groups, each group of magnetic liquid supplements 150 includes a plurality of magnetic liquid supplements 150, and the plurality of magnetic liquid supplements 150 are spaced apart in the circumferential direction of the rotating shaft 120 and are disposed in the pole shoe 130. The plurality of sets of magnetic liquid compensators 150 are arranged at intervals in the axial direction of the rotating shaft 120, and a plurality of pole teeth 131 are arranged between two adjacent sets of magnetic liquid compensators 150. The arrangement enables the pole shoe 130 to form a sealing line with more stages in the axial direction of the rotating shaft 120, so that the magnetic liquid replenishing capacity is further improved, and the sealing performance and the sealing reliability are further improved.

Further, the magnetic fluid sealing apparatus 100 of the present embodiment further includes a pressure sensor (not shown) connected to the control system, wherein a pressure sensing end of the pressure sensor extends into the tooth groove 1311 where the first end 151 is located so as to detect the pressure in the tooth groove 1311, and the pressure sensing end of the pressure sensor senses the change of the pressure when the first-stage seal line is broken and the sealed fluid leaks into the tooth groove 1311. Optionally, the control system is provided outside the axle housing 110.

The pressure signal sensed by the pressure sensor is transmitted to the control system, and the control device controls the external power supply to energize the magnetic liquid supplement piece 150 so as to rapidly raise the temperature of the magnetic liquid supplement piece 150, thereby forming new magnetic liquid under the temperature condition.

Further, the magnetic liquid supplement 150 includes a first portion 154 and a second portion 155. As shown in fig. 4 and 5, the second portion 155 is spaced apart from the rotational axis 120 as compared to the first portion 154. At least a portion of the first portion 154 fits within the through-hole 132. The size of the second portion 155 is larger than that of the through hole 132, and the second portion 155 abuts against the outer circumferential surface of the pole piece 130 so as to limit the magnetic liquid supplement piece 150 in the radial direction of the pole piece 130 and prevent the magnetic liquid supplement piece 150 from sliding out along the through hole 132.

Further, a sealing ring (not shown) is disposed between the magnetic liquid supplement 150 and the pole piece 130, and the sealing ring is used for sealing between the magnetic liquid supplement 150 and the pole piece 130, so as to prevent leakage of the magnetic liquid or the sealed liquid. Specifically, the sealing ring is fitted over the first portion of the magnetic liquid supplement 150, or the sealing ring is provided on the wall surface of the through hole 132. Each of the magnetic liquid supplement 150 and the pole shoe 130 is in close abutment with the sealing ring in order to better guarantee the sealing effect.

Further, an external thread is provided on a circumferential surface of a portion of the first portion 154 of the magnetic liquid supplement member 150, and an internal thread matching the external thread is provided on a sidewall of the through hole, so that the magnetic liquid supplement member 150 can be conveniently installed. Optionally, the portion of the first portion 154 provided with the external thread is located inside the portion of the first portion 154 cooperating with the sealing ring, which may enable a further good sealing between the magnetic liquid supplement 150 and the pole piece 130, further preventing leakage of the magnetic liquid or the sealed liquid.

Further, in order to better facilitate the installation of the magnetic liquid supplement 150, the size of the inner end (the end near the rotation shaft 120) of the first portion 154 is smaller than the size of the outer end (the end far from the rotation shaft 120). By way of example, as shown in FIG. 6, the first portion 154 includes a small diameter section 1541 closer to the spindle and a large diameter section 1542 further from the spindle 120. The small diameter section 1541 is connected to the large diameter section 1542, and the small diameter section 1541 has a smaller diameter than the large diameter section 1542.

As shown in fig. 4, a magnetic isolation sleeve 133 is disposed on a side wall surface of the through hole 132, and the magnetic isolation sleeve 133 shields the magnetic fluid supplement 150 and the pole piece 130 from the magnetic fluid. Alternatively, in other embodiments, the magnetic liquid supplement 150 is coated with a magnetic shield 133 on the outside. A magnetic spacer 133 is located between the pole piece 130 and the magnetic liquid supplement 150.

The structure of the magnetic liquid sealing apparatus 100 of the present embodiment will be specifically described below by taking the magnetic liquid sealing apparatus shown in fig. 1 as an example.

The pole piece 130 includes a first pole piece 134 and a second pole piece 135, and the permanent magnet 140 includes a first permanent magnet, and the permanent magnet 140 is located between the first pole piece 134 and the second pole piece 135 in the axial direction of the rotating shaft 120. The magnetic liquid supplement 150 includes a first supplement 156 and a second supplement 157, the first supplement 156 including four and being provided in the first pole piece 134, and the second supplement including four and being provided in the second pole piece 135.

Specifically, the left side surface of the first pole piece 134 abuts on the right side surface of the permanent magnet 140, and the right side surface of the second pole piece 135 abuts on the left side surface of the permanent magnet 140. The permanent magnet 140 can provide a magnetic force to the first and second pole pieces 134 and 135.

Further, the magnetic liquid sealing apparatus 100 further includes a first cooling jacket 161 and a second cooling jacket 162.

The first pole piece 134, the permanent magnet 140, and the second pole piece 135 are located between the first cooling jacket 161 and the second cooling jacket 162 in the axial direction of the rotating shaft 120.

By way of example, as shown in FIG. 1, a first cooling jacket 161 is mated to the right side surface of the first pole piece 134. The second cooling jacket 162 is fitted to the left side surface of the second pole piece 135.

The first cooling jacket 161 and the second cooling jacket 162 are sleeved on the rotating shaft 120, and a first cooling cavity 1611 is defined between the first cooling jacket 161 and the first pole piece 134. A second cooling cavity 1621 is defined between the second cooling jacket 162 and the second pole piece 135, and a coolant is filled in each of the first cooling cavity 1611 and the second cooling cavity 1621. The coolant acts as a cooling function.

Optionally, the coolant is cooling water.

In some embodiments, as shown in fig. 1, the axle housing 1 has a first through hole 1612 and a second through hole 1622, the first through hole 1612 is communicated with the first cooling cavity 1611 to fill the first cooling cavity 1611 with the coolant through the first through hole 1612, and the second through hole 1622 is communicated with the second cooling cavity 1621 to fill the second cooling cavity 1621 with the coolant through the second through hole 1622.

Optionally, the first and second cooling jackets 161 and 162 are non-magnetic materials to prevent magnetic lines of force emitted from the permanent magnets 140 from leaking from both sides of the pole piece 130.

In a specific embodiment, as shown in fig. 1, magnetic fluid seal apparatus 100 further comprises first bearing 171 and second bearing 172. Each of the first bearing 171 and the second bearing 172 is fitted over the rotating shaft 120, and the first bearing 171 and the second bearing 172 are spaced apart in the axial direction of the rotating shaft 120. Each of the first pole piece 134, the second pole piece 135, the permanent magnet 140, the first cooling jacket 161, and the second cooling jacket 162 is located between the first bearing 171 and the second bearing 172 in the axial direction of the rotating shaft 120.

In some embodiments, as shown in fig. 1, the magnetic fluid containment device 100 further comprises a first sleeve 181 and a second sleeve 182. The first sleeve 181 is located between the first bearing 171 and the first cooling jacket 161 in the axial direction of the rotating shaft 120, and the second sleeve 182 is located between the second bearing 172 and the second cooling jacket 162 in the axial direction of the rotating shaft 120.

The magnetic fluid seal device 100 further includes a first end cap 91 and a second end cap 92. The first end cap 91 is attached to one end of the shaft housing 1, the second end cap 92 is attached to the other end of the shaft housing 1, and the first end cap 91 and the second end cap 92 limit the components in the chamber 11 in the axial direction of the rotary shaft 120. As shown in fig. 1, the right end surface of the first bearing 171 abuts against the inner protrusion of the first end cover 91, and the left end surface of the second end cover 92 abuts against the inner protrusion of the second end cover 92.

In some embodiments, as shown in fig. 1, the magnetic liquid sealing apparatus 100 further includes a first sealing ring 101 and a second sealing ring 102, the first sealing ring 101 is located between the outer circumferential surface of the first pole piece 134 and the circumferential wall surface of the chamber 11, and the second sealing ring 102 is located between the outer circumferential surface of the second pole piece 135 and the circumferential wall surface of the chamber 11. The first and second seal rings 101 and 102 are used to improve the sealing property between the outer circumferential surfaces of the first and second pole pieces 134 and 135 and the circumferential wall surface of the chamber 11.

Alternatively, the first sealing ring 101 and the second sealing ring 102 may be one of an O-ring, a V-ring, and a U-ring.

In some embodiments, the magnetic liquid sealing device 100 further includes a first nut 103 and a second nut 104, and the first nut 103 and the second nut 104 are sleeved on the rotating shaft 120 and used for fixing and limiting components in the chamber 111, so as to prevent the components in the chamber 111 from moving and improve the stability of the magnetic liquid sealing device 100. As shown in fig. 1, the first nut 103 abuts against the right end surface of the first bearing 171, and the second nut 104 abuts against the left end surface of the second end cap 92.

Example two:

the magnetic fluid sealing device 100 (not shown) of the present embodiment includes two pole pieces 130, the magnetic fluid supplement member 150 is a resistor sheet, and the magnetic fluid supplement member 150 is sandwiched between the two pole pieces 130.

In order to realize the sealing between the magnetic fluid supplement member 150 and the two pole shoes 130, the magnetic fluid sealing device 100 further includes a first magnetic isolation sheet and a second magnetic isolation sheet, and the resistor sheet is sandwiched between the first magnetic isolation sheet and the second magnetic isolation sheet in the axial direction of the rotating shaft.

Optionally, each of the resistor disc, the first magnetism isolating sheet and the second magnetism isolating sheet is annular and is sleeved on the rotating shaft 120.

The magnetic liquid sealing device 100 of the present embodiment further includes two permanent magnets 140, and each of the resistor disc, the first magnetism-isolating sheet, and the second magnetism-isolating sheet is located between the two permanent magnets 140 in the axial direction of the rotating shaft 120. One of the two permanent magnets 140 opposes one of the two pole pieces 130 to provide a magnetic force to the pole piece 130. The other of the two permanent magnets 140 opposes the other of the two pole pieces 130 to provide a magnetic force to the pole piece 130.

Other structures of the magnetic liquid sealing apparatus 100 of the present embodiment, such as the first cooling jacket 161, the second cooling jacket 162, the first bearing 171, and the second bearing 172, are similar to the embodiments, and are not described herein again.

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 apparatus for sealing a fluid, comprising:

a shaft housing defining a chamber;

the sealing cavity is connected with one end of the shaft shell and defines a sealing cavity for containing sealed liquid;

the rotating shaft is rotatably arranged in the cavity;

the magnetic sealing device comprises two pole shoes, wherein the two pole shoes are sleeved on the rotating shaft, a plurality of pole teeth which are distributed along the axial direction of the rotating shaft are formed on the inner circumferential surface of each pole shoe, a first gap is formed between the tooth top surface of each pole tooth and the circumferential surface of the rotating shaft, magnetic liquid for sealing can be adsorbed on the tooth top surface of each pole tooth, and the magnetic liquid can be filled in the first gap;

the permanent magnet is sleeved on the rotating shaft and abuts against the pole shoe so as to provide magnetic force for the pole shoe;

a magnetic liquid supplement having a first end and a second end opposite to each other in a radial direction of the rotating shaft, the first end being opposite to the circumferential surface of the rotating shaft and having a second gap therebetween, the first end being located between two adjacent pole teeth or two adjacent pole shoes in an axial direction of the rotating shaft, the first end being capable of adsorbing magnetic particles thereon, the magnetic particles being capable of being located in the second gap, the magnetic liquid supplement being capable of being heated, the magnetic liquid supplement being magnetically isolated from the pole shoes, each of the magnetic liquid supplement, the pole shoes and the permanent magnets being located in the chamber; and

a control system capable of controlling heating of the magnetic liquid supplement.

2. The magnetic fluid seal apparatus for sealing fluid of claim 1, wherein said magnetic fluid supplement is a resistance wire disposed within said pole shoe, a first end of said resistance wire being located axially of said shaft within a tooth space between said two adjacent teeth.

3. The magnetic liquid sealing device for sealing liquid according to claim 2, wherein the resistance wire comprises a plurality of resistance wires, and the plurality of resistance wires are arranged at intervals in the circumferential direction of the rotating shaft.

4. The magnetic fluid seal apparatus for sealing fluids of claim 2 further comprising a pressure sensor having a sensing end located within said tooth slot.

5. The magnetic liquid seal device for sealing a liquid according to claim 2, wherein the adjacent two pole teeth include a first pole tooth and a second pole tooth, the first pole tooth is located between the second pole tooth and the seal cavity in the axial direction of the rotating shaft, wherein the distance from the first end of the resistance wire to the first pole tooth in the axial direction of the rotating shaft is smaller than the distance from the first end of the resistance wire to the second pole tooth in the axial direction of the rotating shaft.

6. The magnetic liquid sealing device for sealing liquid as claimed in claim 2, wherein a through hole extending along the radial direction of the rotating shaft is provided on the pole shoe, the resistance wire is fitted in the through hole, and the magnetic liquid sealing device further comprises a magnetic isolation sleeve which is sleeved on the inner side wall surface of the through hole or sleeved on the resistance wire.

7. The magnetic fluid seal apparatus for sealing a fluid of claim 1 wherein said pole pieces are two, said magnetic fluid supplement is a resistive sheet sandwiched between adjacent two of said pole pieces.

8. The magnetic liquid seal device according to claim 7, further comprising a first magnetism isolating sheet and a second magnetism isolating sheet, the first magnetism isolating sheet and the second magnetism isolating sheet being disposed between two adjacent pole shoes in the axial direction of the rotating shaft, and the resistor sheet being sandwiched between the first magnetism isolating sheet and the second magnetism isolating sheet in the axial direction of the rotating shaft.

9. The magnetic fluid seal apparatus for sealing fluids of claim 1 wherein said first end is magnetic, said first end being less magnetic than said teeth.

10. The magnetic fluid seal apparatus for sealing a fluid according to claim 1 wherein said second gap is larger than said first gap.

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