CN112963548A - Magnetic liquid sealing device capable of sealing liquid - Google Patents
Magnetic liquid sealing device capable of sealing liquid Download PDFInfo
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- CN112963548A CN112963548A CN202110310357.XA CN202110310357A CN112963548A CN 112963548 A CN112963548 A CN 112963548A CN 202110310357 A CN202110310357 A CN 202110310357A CN 112963548 A CN112963548 A CN 112963548A
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- rotating shaft
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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
Abstract
The invention provides a liquid-sealable magnetic liquid sealing device, which comprises a shaft shell, a rotating shaft, a sealing chamber, a pole shoe, a permanent magnet and a spacer block, wherein the spacer block is sleeved on the rotating shaft, a gap is arranged between the inner circumferential surface of the spacer block and the circumferential surface of the rotating shaft in the radial direction of the rotating shaft, the spacer block has magnetism so as to form a magnetic field in the gap, magnetic gas is filled in the gap, the magnetic gas forms a gas isolation layer under the action of the magnetic field, the spacer block is positioned between the sealing chamber and the pole shoe in the axial direction of the rotating shaft, the gas isolation layer can effectively prevent the magnetic liquid and a sealed medium (such as a liquid medium) from contacting with each other, and avoid the generation of Kelvin-Helmholtz instability, the magnetic liquid sealing device has positive effects on the pressure resistance and the sealing life of the magnetic liquid sealing device for keeping the sealable liquid.
Description
Technical Field
The invention relates to the technical field of magnetic liquid sealing, in particular to a magnetic liquid sealing device suitable for sealing liquid.
Background
The magnetic liquid sealing device capable of sealing liquid 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 apparatus capable of sealing liquid is used for sealing a liquid medium, even though theoretically mutual solubility between the magnetic liquid and the sealed liquid does not occur, Kelvin-Helmholtz instability (Kelvin-Helmholtz instability) may occur at a liquid-liquid interface of the magnetic liquid and the sealed liquid, pressure resistance of the magnetic liquid sealing apparatus capable of sealing liquid may be seriously reduced, a sealing life of the magnetic liquid sealing apparatus capable of sealing liquid may be reduced, and practical application of the magnetic liquid sealing apparatus capable of sealing liquid may be limited.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides the magnetic liquid sealing device capable of sealing liquid, which has the advantages of good sealing effect, good pressure resistance and long service life.
According to the embodiment of the invention, the magnetic liquid sealing device capable of sealing liquid comprises: a shaft housing defining a shaft chamber; the rotating shaft is rotatably arranged in the shaft chamber and extends into the shaft chamber from one end of the shaft shell and extends out of the shaft chamber from the other end of the shaft shell; a sealed chamber defining a sealed cavity, the sealed chamber being connected to the other end of the shaft housing; the magnetic sealing device comprises a pole shoe and a first permanent magnet, wherein the pole shoe is sleeved on the rotating shaft, a plurality of pole teeth are formed on the inner circumferential surface of the pole shoe at intervals along the axial direction of the rotating shaft, magnetic liquid for sealing is adsorbed on the tooth top surface of each pole tooth, and the first permanent magnet is matched with the pole shoe so as to provide magnetic force for the pole shoe; the isolating block is sleeved on the rotating shaft, a gap is formed between the inner circumferential surface of the isolating block and the circumferential surface of the rotating shaft in the radial direction of the rotating shaft, the isolating block is magnetic so that a magnetic field can be formed in the gap, magnetic gas is filled in the gap and forms a gas isolating layer under the constraint of the magnetic field, the isolating block is located between the sealing cavity and the pole shoe in the axial direction of the rotating shaft, and the pole shoe, the first permanent magnet and the isolating block are located in the shaft chamber.
The magnetic liquid sealing device capable of sealing liquid provided by the embodiment of the invention comprises the isolation block positioned between the sealing chamber and the pole shoe, a gap is formed between the isolation block and the rotating shaft, so that the magnetic gas is stably filled in the gap under the constraint of a magnetic field to form a gas isolation layer, the gas isolation layer can effectively prevent the magnetic liquid from contacting with a sealed medium (such as a liquid medium), the occurrence of Kelvin-Helmholtz instability is avoided, and the positive effect is realized on the pressure resistance and the sealing life of the magnetic liquid sealing device capable of keeping the liquid sealed.
Therefore, the magnetic liquid sealing device capable of sealing liquid provided by the embodiment of the invention has the advantages of good sealing effect, good pressure resistance, long service life and the like.
In addition, the magnetic liquid sealing device capable of sealing liquid provided by the invention also has the following additional technical characteristics:
in some embodiments, the spacer is a permanent magnet block, or the spacer is magnetically conductive, and the liquid-sealable magnetic liquid seal comprises a second permanent magnet cooperating with the spacer to provide a magnetic force to the spacer; or the isolation block is magnetic, and the isolation block abuts against the pole shoe so that the first permanent magnet provides magnetic force for the isolation block.
In some embodiments, the magnetic field in the gap increases in strength towards the sealed chamber.
In some embodiments, the spacer block is magnetically conductive, and the liquid-sealing magnetic liquid sealing device includes the second permanent magnet, where the second permanent magnet abuts against a side surface of the spacer block close to the sealing chamber, or a dimension of the gap in a radial direction of the rotating shaft decreases toward a direction close to the sealing chamber.
In some embodiments, the liquid-sealable magnetic liquid seal device has an inflation channel for filling with the magnetic gas, a first end of the inflation channel being in communication with the gap, and a second end of the inflation channel being in communication with a gas reservoir.
In some embodiments, the opening of the first end of the inflation channel is disposed distal to the sealed chamber.
In some embodiments, the inflation channel is disposed on the isolation block, an opening of a first end of the inflation channel is disposed on an inner circumferential surface of the isolation block, an opening of a second end of the inflation channel is disposed on an outer circumferential surface of the isolation block, and the shaft housing is provided with an inflation hole communicated with the second end of the inflation channel so that the magnetic gas enters the gap through the inflation hole and the inflation channel.
In some embodiments, the inflation channel is disposed within the shaft, and the opening at the first end of the inflation channel is disposed on the circumferential surface of the shaft.
In some embodiments, the magnetic liquid sealing device capable of sealing liquid includes a shaft sleeve, the shaft sleeve is sleeved on the rotating shaft, the inflation channel is arranged in the shaft sleeve, the gap is formed by the outer circumferential surface of the shaft sleeve and the inner circumferential surface of the isolation block, and the opening of the first end of the inflation channel is arranged on the outer circumferential surface of the shaft sleeve.
In some embodiments, the pole pieces include a first pole piece and a second pole piece, the permanent magnet is located between and against each of the first pole piece and the second pole piece in an axial direction of the rotating shaft, the first pole piece is closer to the sealed chamber than the second pole piece, and the spacer block is located on a side of the first pole piece close to the sealed chamber and against a side of the first pole piece close to the sealed chamber.
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 liquid-sealable magnetic liquid sealing device according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the spacer block of fig. 1.
Fig. 3 is a schematic structural diagram of a liquid-sealable magnetic liquid seal device according to a second embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a liquid-sealable magnetic liquid sealing device according to a third embodiment of the present invention.
Reference numerals:
100. a magnetic liquid sealing device; 110. a shaft housing; 111. a shaft chamber; 112. an inflation hole; 120. a rotating shaft; 130. a pole shoe; 131. pole teeth; 132. a first pole piece; 133. a second pole piece; 134. a magnetic liquid; 140. a permanent magnet; 150; an isolation block; a gap 151; 152. a groove; 153. a through hole; 160. an inflation channel; 161. a first end; 162. a second end; 170. shaft sleeve
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 liquid sealable magnetic liquid seal apparatus 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 4. The liquid sealable magnetic liquid seal 100 includes a shaft housing 110, a rotating shaft 120, a seal chamber, a pole piece 130, a permanent magnet 140, and a spacer 150. Wherein the pole piece 130, the permanent magnet 140, and the spacer 150 are all located in the shaft chamber 111.
The shaft housing 110 defines a shaft chamber 111. The rotation shaft 120 extends into the shaft chamber 111 from one end of the shaft housing 110 and extends out of the shaft chamber 111 from the other end of the shaft housing 110, and the rotation shaft 120 is rotatable relative to the shaft housing 110. A seal chamber (not shown) defining a seal cavity for containing a sealing medium (e.g., liquid) is connected to 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 are formed on the inner circumferential surface of the pole shoe 130 at intervals along the axial direction of the rotating shaft 120, and magnetic liquid 134 for sealing is adsorbed on the tooth top surface of each pole tooth 131.
A seal gap is formed between the tooth top surface of the tooth 131 and the circumferential surface of the rotating shaft 120 in the radial direction of the rotating shaft 120, and the magnetic liquid 134 is filled in the seal gap to perform a sealing function. The seal gap may be formed by the tooth top surface of the tooth 131 and the circumferential surface of the rotating shaft 120, or may be formed by the tooth top surface of the tooth 131 and the outer circumferential surface of the sleeve 170 fitted around the rotating shaft 120. Here, the sealing function of the magnetic liquid 134 is described by taking the case that the shaft sleeve 170 is not sleeved outside the rotating shaft 120: the magnetic liquid 134 is filled in a seal gap formed between the tooth top surface of the tooth 131 and the circumferential surface of the rotating shaft 120, and the magnetic liquid 134 is in contact with each of the tooth 131 and the rotating shaft 120 so as to achieve effective sealing against the sealing medium. The permanent magnet 140 cooperates with the pole piece 130 to provide a magnetic force to the pole piece 130, e.g., the permanent magnet 140 opposes the pole piece 130 to provide the pole piece 130 with a magnetic force, so the pole teeth 131 have a magnetic force capable of attracting the magnetic liquid 134. Further, according to the law that the magnetic force is large at the narrow portion of the gap, the magnetic liquid 134 can be adsorbed intensively in the seal gap.
The magnetic isolation block 150 is disposed on the shaft 120 and arranged with the pole piece 130 in the axial direction of the shaft 120. The spacer 150 is located between the seal chamber and the pole piece 130 in the axial direction of the rotating shaft 120. In the radial direction of the rotating shaft 120, a gap 151 is provided between the inner circumferential surface of the spacer 150 and the circumferential surface of the rotating shaft 120, and the gap 151 is filled with a magnetic gas. Since the isolation block 150 has magnetism, a stable magnetic field is formed in the gap 151, and the magnetic gas in the gap 151 is not easy to escape under the constraint of the magnetic field, so that a stable gas isolation layer is formed. Since the gap 151 is located between the magnetic liquid 134 and the sealed medium in the axial direction of the rotating shaft 120, the presence of such a stable gas barrier layer effectively prevents the magnetic liquid 134 and the sealed liquid from contacting each other.
The magnetic liquid sealing device capable of sealing liquid provided by the embodiment of the invention comprises the isolation block positioned between the sealing chamber and the pole shoe, a gap is formed between the isolation block and the rotating shaft, so that the magnetic gas is stably filled in the gap under the constraint of a magnetic field to form a gas isolation layer, the gas isolation layer can effectively prevent the magnetic liquid from contacting with a sealed medium (such as a liquid medium), the occurrence of Kelvin-Helmholtz instability is avoided, and the positive effect is realized on the pressure resistance and the sealing life of the magnetic liquid sealing device capable of keeping the liquid sealed.
Therefore, the magnetic liquid sealing device capable of sealing liquid provided by the embodiment of the invention has the advantages of good sealing effect, good pressure resistance, long service life and the like.
For convenience of description, the technical solution of the present application will be described below by taking the axial direction of the rotating shaft 120 as an example along the left-right direction, which is shown by the arrows in fig. 1, 3 and 4.
The following describes the liquid-sealing magnetic liquid sealing apparatus 100 for sealing liquid according to the present invention in detail by taking three specific embodiments as examples.
The first embodiment is as follows:
the liquid-sealable magnetic liquid sealing apparatus 100 of the present embodiment is described in detail with reference to fig. 1 to 2.
As shown in fig. 1, the liquid-sealable magnetic liquid sealing apparatus 100 includes a shaft housing 110, a rotating shaft 120, a sealing chamber (not shown), a first pole piece 132, a second pole piece 133, a permanent magnet 140, and an isolation block 150. The isolation block 150, the first pole piece 132, the permanent magnet 140 and the second pole piece 133 are all located in the shaft chamber 111 defined by the shaft housing 110 and are arranged in sequence from left to right. The rotation shaft 120 is inserted from the right end of the shaft housing 110 and is extended from the left end. The seal chamber is connected to the left end of the shaft housing 110. The isolation block 150, the first pole shoe 132, the permanent magnet 140 and the second permanent magnet 140 are all in an annular structure and are all sleeved on the rotating shaft 120.
In the present embodiment, the permanent magnet 140 is located between the first and second pole pieces 132 and 133 and against each of the first and second pole pieces 132 and 133 so as to provide a magnetic force to the first and second pole pieces 132 and 133. The teeth 131 on the first pole piece 132 and the teeth 131 on the second pole piece 133 are both attracted with the magnetic liquid 134. As shown in fig. 1, the permanent magnet 140 is axially magnetized. It will be appreciated by those skilled in the art that in other embodiments, the permanent magnet 140 may have other structures, and the permanent magnet 140 may be engaged with the pole piece 130 in other manners, which will not be described herein.
The spacer 150 is made of a magnetic conductive material, that is, the spacer 150 is magnetic conductive, and the spacer 150 abuts against the left side surface of the first pole piece 132, so that the magnetic force of the permanent magnet 140 can be transmitted to the spacer 150 through the first pole piece 132. Alternatively, the spacer 150 is magnetized by the magnetic field of the permanent magnet 140. As shown in fig. 1, the isolating block 150 is sleeved on the rotating shaft 120, a gap 151 is formed between the inner circumferential surface of the isolating block 150 and the outer circumferential surface of the rotating shaft 120, since the isolating block 150 has magnetism and the gap 151 has a magnetic field, the magnetic gas filled in the gap 151 forms a gas isolating layer under the action of the magnetic field, and the gas isolating layer can prevent the magnetic liquid and the sealed liquid from contacting each other. Further, the magnetic field strength of the magnetic field in the gap 151 increases toward the sealed chamber. That is, the magnetic field strength of the magnetic field in gap 151 increases to the left, and the magnetic field strength at the left end of gap 151 is greater than the magnetic field strength at the right end, i.e., the magnetic field in gap 151 has a strength gradient. Once the sealed liquid leaks, the sealed liquid first breaks through the leftmost magnetic gas, and then forms a gas-liquid interface with the magnetic gas in the gap 151, so that the magnetic gas generates a force on the sealed liquid under the action of the magnetic field force, and the sealed liquid is prevented from continuously leaking to the right. The magnetic field intensity at the left end of the gap 151 is larger than that at the right end, and the magnetic gas is more inclined to move leftwards, so that the magnetic gas generates stronger force to the sealed liquid at a gas-liquid interface under the action of the magnetic field with the intensity gradient, and the sealed liquid is better prevented from moving rightwards.
In the present embodiment, as shown in fig. 1, the size of the gap 151 in the radial direction of the rotating shaft 120 gradually decreases toward the sealed chamber (leftward), and according to the rule that the smaller the pitch, the larger the magnetic field strength, the smaller the size of the gap 151 in the radial direction of the rotating shaft 120, the smaller the magnetic field strength, the smaller the size in the radial direction of the rotating shaft 120, the larger the magnetic field strength, and the larger the magnetic field strength, the magnetic field strength in the gap 151 can be gradually increased toward the sealed chamber. As shown in fig. 1, since the left end of the gap 151 is small in size, the magnetic field strength at the left end of the gap 151 is greater than that at the right end. Making the left end of gap 151 smaller in size also reduces the amount of sealed media that enters gap 151, reducing instability.
It should be noted that the permanent magnet 140 in the embodiment shown in fig. 1 includes one permanent magnet 140, and the one permanent magnet 140 provides magnetic force for the pole piece 130 and the spacer 150 at the same time. In other embodiments, liquid sealable magnetic liquid seal 100 may include a first permanent magnet 140 and a second permanent magnet 140, the first permanent magnet 140 for cooperating with pole piece 130 to provide a magnetic force to pole piece 130, the second permanent magnet 140 for cooperating with spacer 150 to provide a magnetic force to spacer 150. Specifically, the first permanent magnet 140 may abut the pole piece 130, and the second permanent magnet 140 may abut the spacer 150. The above technical solutions all aim to make the magnetic conductive spacer 150 have magnetism, and it should be noted that, the design manner for making the spacer 150 have magnetism may be various, and all belong to the technical idea of the present invention, and are within the protection scope of the present invention. For example, in some embodiments, the isolation mass 150 is a permanent magnet mass, and thus, the isolation mass 150 itself is magnetic.
It is understood that the isolation piece 150 being magnetic includes both the isolation piece 150 itself being magnetic and the isolation piece 150 being magnetized and indirectly being magnetic. When the spacer 150 is a permanent magnet block, the spacer 150 forms a closed magnetic circuit with other magnetic conductors. When the spacer 150 is magnetically conductive, the spacer 150 forms a closed magnetic circuit with other permanent magnets and the conductive magnet.
Alternatively, in the above embodiment, in order to make the magnetic field strength at the left end of the gap 151 larger, the second permanent magnet 140 may also be abutted against the left end face of the spacer 150, and since the second permanent magnet 140 is closer to the left end of the gap 151, the magnetic field strength at the left end of the gap 151 is larger, that is, the magnetic field strength in the gap 151 gradually increases from right to left, that is, the magnetic field strength in the gap 151 increases toward the direction approaching the sealed chamber. Of course, it is understood that, in the above-mentioned embodiment, the technical solution in the present embodiment may also be adopted, such that the size of the gap 151 in the radial direction of the rotating shaft 120 is gradually reduced toward the direction (leftward) approaching the sealed chamber, and the magnetic field intensity in the gap 151 is also increased toward the direction approaching the sealed chamber.
Further, in order to facilitate filling of the gap 151 with the magnetic gas, the magnetic liquid sealing device 100 capable of sealing liquid has an inflation channel 160 for filling the magnetic gas, a first end 161 of the inflation channel 160 is communicated with the gap 151, and a second end 162 of the inflation channel 160 is communicated with the gas storage tank. The magnetic gas in the gas container may enter the gap 151 through the gas filling passage 160.
In this embodiment, the air charging passage 160 is provided on the spacer 150, the opening of the first end 161 of the air charging passage 160 is provided on the inner circumferential surface of the spacer 150, the opening of the second end 162 of the air charging passage 160 is provided on the outer circumferential surface of the spacer 150, and the shaft housing 110 is provided with the air charging hole 112 communicating with the second end 162 of the air charging passage 160 so that the magnetic gas enters the gap 151 through the air charging hole 112 and the air charging passage 160.
Specifically, as shown in fig. 1 and fig. 2, a right side surface (a side surface close to the first pole piece 132) of the spacer 150 is provided with a groove 152 extending in a radial direction of the rotating shaft 120, and the groove 152 and a left side surface of the first pole piece 132 together define a gas passage. The spacer 150 is further provided with a through hole 153 located outside the groove 152 and communicating with the groove 152, and the through hole 153 and the gas channel together form an inflation channel 160 for flowing magnetic gas. The inner side of the groove 152 opens as an opening of a first end 161 of the inflation channel 160, and an opening of an outer end of the through hole 153 opens as an opening of a second end 162 of the inflation channel 160 on the outer circumferential surface of the spacer 150.
Preferably, as shown in fig. 1, the opening of the first end 161 of the inflation channel 160 is located away from the sealed chamber, that is, the opening of the inner end of the inflation channel 160 is open to the right on the inner peripheral surface of the spacer 150. This arrangement allows the magnetic gas to better fill the gap 151 after entering the gap 151 from the opening at the inner end of the inflation channel 160. This is because, as described above, the magnetic field intensity at the left end of the gap 151 is greater than the magnetic field intensity at the right end, and under the action of the stronger magnetic field intensity, the magnetic gas gradually flows to the left side from the right side of the gap 151, and the air in the gap 151 is slowly squeezed out, so that the magnetic gas is prevented from concentrating at a position where the magnetic field intensity is larger once flowing out of the inflation channel 160, and therefore, the opening of the first end 161 of the inflation channel 160 is located away from the sealed chamber, so that the distribution of the magnetic gas in the gap 151 can be more stable, and a more stable gas isolation layer is formed.
It should be understood that in other embodiments of the present invention, the air charging channel 160 on the spacer 150 may have other structures, for example, a through hole is directly opened in the spacer 150 to form the air charging channel 160, the opening of the first end 161 of the air charging channel 160 is opened on the inner circumferential surface of the spacer 150, the opening of the second end 162 is opened on the side surface of the spacer 150, and so on, as long as the magnetic gas can be charged into the gap 151 through the air charging channel 160, which all belong to the protection scope of the present invention.
In addition, the spacer 150 may be formed with a plurality of air-charging passages 160, and openings of first ends 161 of the plurality of air-charging passages 160 are uniformly arranged on an inner circumferential surface of the spacer 150 around the circumference of the rotation shaft 120 to improve uniformity of magnetic gas injection.
Example two:
next, the liquid-sealable magnetic liquid sealing apparatus 100 of the present embodiment will be described with reference to fig. 3, and the present embodiment has substantially the same structure as the first embodiment, except that the air charging passage 160 of the liquid-sealable magnetic liquid sealing apparatus 100 of the present embodiment is provided in the rotating shaft 120, and the opening of the first end 161 of the air charging passage 160 is provided on the circumferential surface of the rotating shaft 120.
Specifically, as shown in fig. 3, the opening of the first end 161 of the air charging passage 160 is provided on the circumferential surface of the rotating shaft 120, and then the air charging passage 160 extends rightward in the axial direction of the rotating shaft 120, so that the machining of the spacer 150 can be reduced. Alternatively, a plurality of air charging channels 160 may be machined in the rotating shaft 120, and the openings of the first ends 161 of the plurality of air charging channels 160 are uniformly arranged around the circumference of the rotating shaft 120 to improve the uniformity of magnetic gas injection.
Further, as shown in FIG. 3, the opening at the first end 161 of the inflation channel 160 is located away from the sealed chamber, which allows the magnetic gas to better fill the gap 151 after entering the gap 151 from the opening at the inner end of the inflation channel 160.
Example three:
next, the liquid-sealable magnetic liquid sealing device 100 of the present embodiment will be described with reference to fig. 4, and the present embodiment has substantially the same structure as the first embodiment, except that the liquid-sealable magnetic liquid sealing device 100 of the present embodiment includes a shaft sleeve 170, and the shaft sleeve 170 is sleeved on the rotating shaft 120. The shaft 120 is rotatable relative to the sleeve 170. The gap 151 is formed by the outer circumferential surface of the boss 170 and the inner circumferential surface of the spacer 150, the opening of the first end 161 of the air charging passage 160 is provided on the outer circumferential surface of the boss 170, and then the air charging passage 160 extends rightward in the axial direction of the rotary shaft 120, which can reduce the processing of the spacer 150 and the rotary shaft 120.
Further, as shown in FIG. 4, the opening at the first end 161 of the inflation channel 160 is located away from the sealed chamber, which allows the magnetic gas to better fill the gap 151 after entering the gap 151 from the opening at the inner end of the inflation channel 160.
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 liquid-sealable magnetic liquid seal, comprising:
a shaft housing defining a shaft chamber;
the rotating shaft is rotatably arranged in the shaft chamber and extends into the shaft chamber from one end of the shaft shell and extends out of the shaft chamber from the other end of the shaft shell;
a sealed chamber defining a sealed cavity, the sealed chamber being connected to the other end of the shaft housing;
the magnetic sealing device comprises a pole shoe and a first permanent magnet, wherein the pole shoe is sleeved on the rotating shaft, a plurality of pole teeth are formed on the inner circumferential surface of the pole shoe at intervals along the axial direction of the rotating shaft, magnetic liquid for sealing is adsorbed on the tooth top surface of each pole tooth, and the first permanent magnet is matched with the pole shoe so as to provide magnetic force for the pole shoe; and
the isolating block is sleeved on the rotating shaft, a gap is formed between the inner circumferential surface of the isolating block and the circumferential surface of the rotating shaft in the radial direction of the rotating shaft, the isolating block is magnetic so that a magnetic field can be formed in the gap, magnetic gas is filled in the gap and forms a gas isolating layer under the constraint of the magnetic field, the isolating block is located between the sealing cavity and the pole shoe in the axial direction of the rotating shaft, and the pole shoe, the first permanent magnet and the isolating block are located in the shaft chamber.
2. The liquid sealable magnetic liquid seal of claim 1, wherein said spacer blocks are permanent magnet blocks,
or the spacer block is magnetically conductive, and the magnetic liquid sealing device capable of sealing liquid comprises a second permanent magnet which is matched with the spacer block so as to provide magnetic force for the spacer block;
or the isolation block is magnetic, and the isolation block abuts against the pole shoe so that the first permanent magnet provides magnetic force for the isolation block.
3. The liquid sealable magnetic liquid seal of claim 2 wherein the magnetic field in said gap increases in strength in a direction closer to said seal chamber.
4. The liquid sealable magnetic liquid seal of claim 3, wherein said spacer block is magnetically conductive, said liquid sealable magnetic liquid seal comprising said second permanent magnet, said second permanent magnet abutting a side of said spacer block proximate said seal chamber, or,
the size of the gap in the radial direction of the rotating shaft is reduced toward the direction close to the seal chamber.
5. The liquid-sealable magnetic liquid seal according to claim 3, wherein said liquid-sealable magnetic liquid seal has an inflation channel for filling said magnetic gas, a first end of said inflation channel being in communication with said gap and a second end of said inflation channel being in communication with a gas reservoir.
6. The liquid sealable magnetic liquid seal of claim 5 wherein the opening of the first end of said gas filled channel is disposed away from said sealing chamber.
7. The liquid-sealable magnetic liquid sealing device according to claim 5, wherein the inflation channel is provided on the spacer, the opening of the first end of the inflation channel is provided on an inner circumferential surface of the spacer, the opening of the second end of the inflation channel is provided on an outer circumferential surface of the spacer, and the shaft housing is provided with an inflation hole communicating with the second end of the inflation channel so that the magnetic gas enters the gap through the inflation hole and the inflation channel.
8. The liquid-sealable magnetic liquid seal apparatus according to claim 5, wherein said air-filling channel is provided in said shaft, and an opening at a first end of said air-filling channel is provided on a circumferential surface of said shaft.
9. The liquid-sealable magnetic liquid sealing device according to claim 5, comprising a shaft sleeve, wherein the shaft sleeve is fitted around the rotating shaft, the inflation channel is provided in the shaft sleeve, the gap is formed by an outer circumferential surface of the shaft sleeve and an inner circumferential surface of the spacer, and the opening of the first end of the inflation channel is provided on the outer circumferential surface of the shaft sleeve.
10. The liquid sealable magnetic liquid seal of any of claims 7 to 9, wherein said pole pieces comprise a first pole piece and a second pole piece, said permanent magnet being located between and against each of said first and second pole pieces in an axial direction of said shaft, said first pole piece being closer to said seal chamber than said second pole piece, said spacer block being located on a side of said first pole piece closer to said seal chamber and against a side of said first pole piece closer to said seal chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110310357.XA CN112963548B (en) | 2021-03-23 | 2021-03-23 | Magnetic liquid sealing device capable of sealing liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110310357.XA CN112963548B (en) | 2021-03-23 | 2021-03-23 | Magnetic liquid sealing device capable of sealing liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112963548A true CN112963548A (en) | 2021-06-15 |
| CN112963548B CN112963548B (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110310357.XA Active CN112963548B (en) | 2021-03-23 | 2021-03-23 | Magnetic liquid sealing device capable of sealing liquid |
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| US20060244221A1 (en) * | 2005-04-29 | 2006-11-02 | Villeneuve Michel L | Hydrodynamic magnetic seal |
| US20100158718A1 (en) * | 2008-12-24 | 2010-06-24 | Industrial Technology Research Institute | Oil-free centrifugal blade compressor and magnetic-gas bearing thereof |
| CN103343822A (en) * | 2013-07-05 | 2013-10-09 | 北京交通大学 | Magnetic liquid rotating sealing device suitable for space station |
| CN204900112U (en) * | 2015-08-25 | 2015-12-23 | 嘉兴市健杰内燃机零件有限公司 | Internal -combustion engine intake duct oxygen enrichment magnetization unit |
| WO2017027382A1 (en) * | 2015-08-10 | 2017-02-16 | Exxonmobil Upstream Research Company | Device and method for magnetically controlled dry gas seal |
| CN208185252U (en) * | 2018-02-27 | 2018-12-04 | 浙江翔宇密封件有限公司 | A kind of large size farm machinery bearing enclosure |
| CN109347286A (en) * | 2018-12-05 | 2019-02-15 | 王政玉 | A kind of air gap monopole excitation magnetic potential synchronous motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2034213B2 (en) * | 1969-10-10 | 1980-06-26 | Ferrofluidics Corp., Burlington, Mass. (V.St.A.) | Magnetic seal for sealing sealing gaps |
| CN2132881Y (en) * | 1992-07-25 | 1993-05-12 | 东北工学院 | Rotating shaft magnetic fluid sealing device |
| JPH10220595A (en) * | 1997-01-31 | 1998-08-21 | Nok Corp | Sealing device using magnetic fluid |
| CN2320848Y (en) * | 1997-12-05 | 1999-05-26 | 中国矿业大学 | Magnetic fluid sealing device |
| DE10236471A1 (en) * | 2001-11-07 | 2003-05-28 | Siemens Ag | Magnetic bearing for a rotor shaft has permanent magnets attached to the air sealed shaft rotating within an air gap to a superconducting magnetic field |
| US20040173972A1 (en) * | 2003-03-06 | 2004-09-09 | Zhixin Li | Ferrofluid seal incorporating multiple types of ferrofluid |
| US20060244221A1 (en) * | 2005-04-29 | 2006-11-02 | Villeneuve Michel L | Hydrodynamic magnetic seal |
| US20100158718A1 (en) * | 2008-12-24 | 2010-06-24 | Industrial Technology Research Institute | Oil-free centrifugal blade compressor and magnetic-gas bearing thereof |
| CN103343822A (en) * | 2013-07-05 | 2013-10-09 | 北京交通大学 | Magnetic liquid rotating sealing device suitable for space station |
| WO2017027382A1 (en) * | 2015-08-10 | 2017-02-16 | Exxonmobil Upstream Research Company | Device and method for magnetically controlled dry gas seal |
| CN204900112U (en) * | 2015-08-25 | 2015-12-23 | 嘉兴市健杰内燃机零件有限公司 | Internal -combustion engine intake duct oxygen enrichment magnetization unit |
| CN208185252U (en) * | 2018-02-27 | 2018-12-04 | 浙江翔宇密封件有限公司 | A kind of large size farm machinery bearing enclosure |
| CN109347286A (en) * | 2018-12-05 | 2019-02-15 | 王政玉 | A kind of air gap monopole excitation magnetic potential synchronous motor |
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