JP6906266B2 - Magnetic particle sealing device used for reciprocating shaft - Google Patents

Description

The present disclosure relates to the field of sealing technology, and particularly to a magnetic particle sealing device used for a reciprocating shaft.

The magnetic powder seal is a seal type using magnetic particles as a main component and micro-nano magnetic powder (hereinafter referred to as "magnetic powder") formed by modifying with a surfactant, a lubricant, or the like as a sealing medium. Magnetic particle sealing is a high-performance, new sealing technology that has a lower leakage rate, stronger pressure resistance, higher reliability, can withstand extreme temperatures, and is able to withstand extreme temperatures compared to conventional sealing methods. It has an advantage that the pressure resistance in the above can be improved.

However, in the magnetic powder sealing device in the related technology, in the process of reciprocating the reciprocating shaft, a part of the magnetic powder tends to adhere to the reciprocating shaft and is gradually dragged away from the sealing gap. When the reciprocating operation is performed for a long period of time, the amount of magnetic powder adsorbed in the sealing gap is reduced, the pressure resistance of the sealing device is lowered, the leakage rate is increased, and the sealing effect is completely lost.

The present disclosure aims to solve at least one of the technical problems in the related technology to some extent. Therefore, the embodiment according to the present disclosure provides a magnetic powder sealing device used for a reciprocating shaft, realizes self-replenishment of magnetic powder, and improves the sealing effect of the sealing device.

The magnetic powder sealing device used for the reciprocating shaft in the embodiment according to the present disclosure includes a casing, a reciprocating shaft, a first pole piece, a second pole piece, a permanent magnet, and a first magnetic powder replenishment unit. The shaft penetrates the casing and can reciprocate with respect to the casing along the axial direction of the reciprocating shaft. The first pole piece is provided in the casing and of the reciprocating shaft. A plurality of first pole teeth that are set on the outer peripheral side and are arranged at intervals along the axial direction of the reciprocating shaft are provided on the inner peripheral wall of the first pole piece. Magnetic powder for sealing is provided between the tip surface of the tooth and the outer peripheral surface of the reciprocating shaft, the first pole piece has a first accommodating cavity, and the second pole piece is inside the casing. A plurality of second pole teeth are set on the outer peripheral side of the reciprocating shaft and are arranged at intervals along the axial direction of the reciprocating shaft on the inner peripheral wall of the second pole piece. The magnetic powder is provided between the tip surface of the tooth of the second pole tooth and the outer peripheral surface of the reciprocating shaft, and the permanent magnet is provided in the casing and on the outer peripheral side of the reciprocating shaft. The permanent magnet is located between the first pole piece and the second pole piece, and is set to the permanent magnet, the first pole piece, the magnetic powder, the reciprocating shaft, and the second pole piece. Formed a magnetic circuit, the first magnetic powder replenishment unit includes a first magnetic powder block, and the first magnetic powder block is provided in the first accommodating cavity and moves between the first position and the second position. It is possible, and at the first position, the first magnetic powder block contacts the outer peripheral surface of the reciprocating shaft and rubs against the reciprocating shaft to generate magnetic powder, whereby the first pole tooth and the reciprocating shaft are generated. At the second position, the first magnetic powder block is separated from the outer peripheral surface of the reciprocating shaft.

In the magnetic powder sealing device used for the reciprocating shaft in the embodiment according to the present disclosure, magnetic powder is generated by the first magnetic powder block of the first magnetic powder replenishment unit, and the magnetic powder is replenished in the seal gap by the action of the magnetic field force, and is filled in the seal gap from the outside. It becomes unnecessary to replenish the magnetic powder, and self-replenishment of the magnetic powder is realized. This device can recover the sealing performance after the sealing effect is lowered, improve the pressure resistance of the sealing device, and reduce the leakage rate.

In some embodiments, the first magnetic particle replenishment unit further includes a first operating member and a first demagnetized block. One end of the first operating member is inserted into the first accommodating cavity through the casing and the first pole piece, and is connected to the first magnetic particle block, and the first demagnetized block is said. It is provided between the first pole piece and the first magnetic powder block, and the first operating member is connected to the first magnetic powder block via the first demagnetizing block.

In some embodiments, the first operating member has a first end portion and a first connecting rod, the first end portion is located outside the casing, and the first connecting rod has one end. It is connected to the first end portion, and the other end is inserted into the first accommodating cavity portion through the casing and the first pole piece, and is connected to the first demagnetized block.

In some embodiments, the first connecting rod can move with respect to the casing and the first pole piece along the length direction of the first connecting rod, and the first operating member is the first. Further having a return spring, the first return spring abuts between the first end portion and the casing, abuts the first end portion and the casing, and is on the outer peripheral side of the first connection rod. Set.

In some embodiments, the first connecting rod is connected to the casing by a screw, the first demagnetizing block is rotatably connected to the first connecting rod, and is attached to the inner wall surface of the first accommodating cavity. Is provided with a limit groove extending along the length direction of the first connecting rod, and the demagnetized block is movably fitted in the limit groove.

In some embodiments, the magnetic particle sealing device further comprises a first spacer, which is provided closer to the first pole piece of the first demagnetized block and the first connecting rod. Surrounds.

In some embodiments, the portion of the reciprocating shaft facing the first magnetic particle block is provided with a surface treatment layer or is made of a wear resistant material.

In some embodiments, the second pole piece has a second containment cavity, the magnetic particle sealing device further comprises a second magnetic particle replenishment unit including a second magnetic particle block, the second magnetic particle block said. It is provided in the second accommodating cavity and can be moved between the third position and the fourth position. At the third position, the second magnetic particle block comes into contact with the outer peripheral surface of the reciprocating shaft, and the said By rubbing against the reciprocating shaft to generate magnetic powder, the magnetic powder between the second pole tooth and the reciprocating shaft is replenished, and at the fourth position, the second magnetic powder block is transmitted from the outer peripheral surface of the reciprocating shaft. It is separated.

In some embodiments, the second magnetic particle replenishment unit further includes a second operating member and a second demagnetizing block, one end of the second operating member through which the casing and the second pole piece are inserted. It is inserted into the second accommodating cavity and connected to the second magnetic powder block, and the second operating member is connected to the second magnetic powder block via the second demagnetizing block.

In some embodiments, the magnetic particle sealing device further comprises a lip sealing ring, the casing having a first insertion hole and a second insertion hole through which the reciprocating shaft is inserted, the first insertion hole and the second insertion hole. An annular groove into which the lip seal ring is fitted is provided on any inner peripheral surface of the insertion hole.

Some of the additional content and benefits of this disclosure will be disclosed in the following description, some will be clarified by the following description, or will be grasped by the application of this disclosure.

It is sectional drawing of the magnetic powder sealing apparatus in the Example by this disclosure. It is a cross-sectional view of AA of the magnetic particle sealing device shown in FIG. It is a schematic diagram which shows the state that the 1st magnetic particle block of the magnetic particle sealing apparatus in the Example by this disclosure is in a 1st position. It is sectional drawing of the magnetic powder sealing apparatus in another Example by this disclosure. It is sectional drawing of the magnetic powder sealing apparatus in still another Example by this disclosure.

Hereinafter, examples of the present disclosure will be described in detail. Examples of the above embodiments are shown in the drawings. The examples described below with reference to the drawings are exemplary and are intended to illustrate the present disclosure and not to limit the present disclosure.

As shown in FIGS. 1 and 2, the magnetic particle sealing device used for the reciprocating shaft 2 in the embodiment according to the present disclosure includes a casing 1, a reciprocating shaft 2, a first pole piece 3, a second pole piece 4, and the like. A permanent magnet 5 and a first magnetic particle replenishment unit 6 are provided.

Here, the reciprocating shaft 2 can penetrate the casing 1 and reciprocate with respect to the casing 1 along the axial direction of the reciprocating shaft 2 (the direction indicated by the arrow B in FIG. 1). The first pole piece 3 is provided in the casing 1 and is set on the outer peripheral side of the reciprocating shaft 2. A plurality of first pole teeth 31 arranged at intervals along the axial direction of the reciprocating shaft 2 are provided on the inner peripheral wall of the first pole piece 3. Magnetic powder for sealing is provided between the tip surface of the teeth of the first pole teeth 31 and the outer peripheral surface of the reciprocating shaft 2, and the first pole piece 3 has a first accommodating cavity. The second pole piece 4 is provided in the casing 1 and is set on the outer peripheral side of the reciprocating shaft 2. A plurality of second pole teeth 41 arranged at intervals in the axial direction of the reciprocating shaft 2 are provided on the inner peripheral wall of the second pole piece 4. Similarly, magnetic powder is provided between the tip surface of the teeth of the second pole teeth 41 and the outer peripheral surface of the reciprocating shaft 2.

The permanent magnet 5 is provided in the casing 1 and is set on the outer peripheral side of the reciprocating shaft 2, and the permanent magnet 5 is located between the first pole piece 3 and the second pole piece 4. The permanent magnet 5, the first pole piece 3, the magnetic powder, the reciprocating shaft 2, and the second pole piece 4 form a magnetic circuit. The first pole piece 3, the reciprocating shaft 2, and the second pole piece 4 are all made of a magnetic conductive material, but the casing 1 is made of a non-magnetic conductive material. The magnetic powder is attracted to the tip surfaces of the teeth of the first pole teeth 31 and the second pole teeth 41 by the action of the magnetic field, and comes into contact with the reciprocating shaft 2 to realize a seal. Hereinafter, for the sake of simplicity, the gap between the reciprocating shaft 2 and the first pole teeth 31 or the second pole teeth 41 will be referred to as a seal gap.

The first magnetic powder replenishment unit 6 includes the first magnetic powder block 61, and the first magnetic powder block 61 is provided in the first accommodating cavity of the first pole piece 3 and moves between the first position and the second position. It is possible, and at the first position, the first magnetic powder block 61 contacts the outer peripheral surface of the reciprocating shaft 2 and rubs against the reciprocating shaft 2 to generate magnetic powder. Since the magnetic field lines in the seal gap are most dense, the magnetic powder formed by friction flows from the first magnetic powder block 61 to the first pole teeth 31 by the action of the magnetic field force, is attracted to the first pole teeth 31, and is attracted to the magnetic powder in the seal gap. Will be realized. At the second position, the first magnetic powder block 61 is separated from the outer peripheral surface of the reciprocating shaft 2 and does not generate magnetic powder.

Incidentally, the magnetic particles have an average particle diameter of the SmCo ₅ powder of 30nm average particle size of 100μm oleic acid-coated _Fe 3 _{O 4} particles, the mass ratio of 2: 1. The mixture was mixed with molybdenum disulfide It is a prepared powder. The first magnetic powder block 61 is a block-shaped solid formed by mixing the above magnetic powder with a resin and pressing it.

In the magnetic powder sealing device according to the embodiment of the present disclosure, a first magnetic powder replenishment unit 6 is provided, magnetic powder is generated by the first magnetic powder block 61 of the first magnetic powder replenishment unit 6, and the magnetic powder is replenished in the seal gap by the action of a magnetic field force. Therefore, it is not necessary to replenish the magnetic powder in the seal gap from the outside, and self-replenishment of the magnetic powder in the apparatus is realized. This device can recover the sealing performance after the sealing effect is lowered, improve the pressure resistance of the sealing device, and reduce the leakage rate.

The first magnetic particle replenishment unit 6 in the embodiment according to the present disclosure further includes a first operating member and a first demagnetizing block 62, and one end of the first operating member is inserted through a casing 1 and a first pole piece 3. 1 It is inserted into the housing cavity and connected to the first magnetic powder block 61. When installed in this way, the user can control the first magnetic particle block 61 so as to be brought into contact with and separated from the reciprocating shaft 2 by the first operating member. Further, since the pressure on the magnetic powder block can be controlled by the first operating member, the amount of magnetic powder generated within a unit time is controlled by controlling the pressure between the magnetic particle block and the reciprocating shaft 2. , The user can adaptively replenish the magnetic powder based on the degree of consumption of the magnetic powder and the sealing performance of the sealing device.

A first demagnetization block 62 is provided between the first pole piece 3 and the first magnetic powder block 61 in order to prevent the magnetic performance of the magnetic powder block and other parts from affecting each other. The first demagnetized block 62 is manufactured of a non-magnetic material such as degaussed 304 stainless steel or an aluminum alloy material. The first operating member is connected to the first magnetic powder block 61 via the first demagnetizing block 62. In this embodiment, the connection between the first magnetic block 62 and the first magnetic powder block 61 is realized by an adhesive, but of course, the connection is not limited to this, and other methods may be used for stable connection. It suffices to play the effect of

In some embodiments, the first operating member has a first end portion 63 and a first connecting rod 64, the first end portion 63 is located outside the casing 1, and the first connecting rod 64 is One end is connected to the first end portion 63, and the other end is inserted into the first accommodating cavity through the casing 1 and the first pole piece 3 and is connected to the first demagnetized block 62. When installed in this way, the user can control the first connecting rod 64 by the first end portion 63, and can easily apply pressure to the connecting rod to more accurately control the amount of magnetic powder replenished. be able to.

Further, as shown in FIG. 1, the first operating member further includes a first return spring 65, and the first connecting rod 64 has a length of the first connecting rod 64 with respect to the casing 1 and the first pole piece 3. The first return spring 65 can move along the direction, and the first return spring 65 comes into contact with the first end portion 63 and the casing 1 between the first end portion 63 and the casing 1 and is set on the outer peripheral side of the connecting rod. Will be done. In other words, one end of the first return spring 65 comes into contact with the side of the first end portion 63 close to the casing 1, and the other end comes into contact with the casing 1.

When installed in this way, the user can easily and directly apply pressure to the first connecting rod 64 by pushing the first end portion 63. Further, after the replenishment of magnetic powder is completed, the first operating member is automatically restored by the action of the first return spring 65, and the first magnetic powder block 61 is separated from the reciprocating shaft 2. Therefore, the operation becomes easy. Further, the first return spring 65 can continuously apply a bearing force to the first end portion 63, ensuring that the first magnetic powder block 61 does not come into contact with the reciprocating shaft 2 in a natural state.

As shown in FIG. 4, in another embodiment, the first connecting rod 64 is connected to the casing 1 by a screw, and the first demagnetized block 62 is rotatably connected to the first connecting rod 64, and the first A limit groove extending along the length direction of the first connecting rod 64 is provided on the inner wall surface of the accommodating cavity, and the first demagnetized block 62 is movably fitted in the limit groove. In other words, the first demagnetized block 62 is rotatable with respect to the first connecting rod 64, and the first demagnetized block 62 moves with respect to the limit groove along its extending direction. Only possible and cannot rotate with respect to the limit groove. A male screw is provided on the outer circumference of the first connection rod 64, a screw hole is provided in the casing 1, and the first connection rod 64 is fitted into the screw hole of the casing 1. In this embodiment, the first demagnetized block 62 and the first connecting rod 64 are connected by a pin shaft, the pin shaft and the first connecting rod 64 are provided coaxially, and the demagnetized block rotates normally. There is a sufficient gap so that it can be done.

As shown in FIG. 4, the first pole piece 3 has a separated structure, and the first left half pole piece and the first right half pole have a separated structure so that the first demagnetized block 62 can be easily mounted in the limit groove. Divided into pieces. At the time of attachment, first, the first demagnetized block 62 and the first magnetic powder block 61 are connected, and then the first left half pole piece is put in the casing 1, and the first demagnetized block 62 and the first connecting rod 64 are connected. Finally, attach the first right half pole piece.

Therefore, the user moves the first connecting rod 64 in the length direction of the screw hole by rotating the first connecting rod 64 or the first end portion 63 along the direction indicated by the arrow D in FIG. The first magnetizing block 62 can be moved along the extending direction of the limit groove. The first demagnetizing block 62 moves the first magnetic powder block 61 and finally brings it into contact with the reciprocating shaft 2 to generate magnetic powder by friction. In such a method, it is not necessary to continuously urge the end portion or the connecting rod, and a larger pressure can be provided to the first magnetic powder block 61 to replenish the magnetic powder more quickly. ..

In some embodiments, the first magnetic particle replenishment unit 6 further comprises a first spacer 66, the first spacer 66 being provided closer to the first pole piece 3 of the first demagnetized block 62 and the first. Surrounds the connecting rod 64. The first spacer 66 is provided between the first demagnetized block 62 and the inner peripheral wall of the casing 1, and is set on the outer peripheral side of the first connecting rod 64. The first spacer 66 acts as a seal, and the first accommodating cavity portion communicates with the outside through the gap between the first pole piece 3 and the casing 1 and the first connecting rod 64, so that the seal becomes invalid. To prevent that. Further, in another embodiment, an annular groove is provided in the outer peripheral wall of the first pole piece 3, and an O-ring is provided in the annular groove. The O-ring is used to prevent the sealed chamber from communicating with the outside through the gap between the first pole piece 3 and the casing 1.

As shown in FIG. 1, in some embodiments, the magnetic particle sealing device further comprises a second magnetic particle replenishment unit 7. The structure of the second magnetic particle replenishment unit 7 is almost the same as that of the first magnetic particle replenishment unit 6, and is different in that the relative positions in the casing 1 are different. The first magnetic particle replenishment unit 6 corresponds to the first pole piece 3 and is for replenishing the magnetic powder in the first pole teeth 31. The second magnetic particle replenishment unit 7 corresponds to the second pole piece 4 and is for replenishing the magnetic powder in the second pole teeth 41.

Specifically, the second magnetic particle replenishment unit includes a second magnetic particle block 71, a second operating member, and a second demagnetized block 72, and the second pole piece 4 has a second accommodating cavity. The second magnetic particle block 71 is provided in the second accommodating cavity and is movable between the third position and the fourth position. At the third position, the second magnetic powder block 71 contacts the outer peripheral surface of the reciprocating shaft 2 and rubs against the reciprocating shaft 2 to generate magnetic powder, thereby producing magnetic powder between the second pole teeth 41 and the reciprocating shaft 2. refill. At the fourth position, the second magnetic particle block 71 is separated from the outer peripheral surface of the reciprocating shaft 2.

The second magnetic particle replenishment unit 7 also has a second spacer 76 corresponding to the first spacer 66. The second spacer 76 is provided on the side of the second demagnetization block 72 near the second pole piece 4, and by surrounding the second connecting rod 74, the second accommodating cavity portion becomes the second pole piece 4 and the casing. It prevents communication to the outside through the gap between 1 and the second connecting rod 74. Similarly, an annular groove is provided in the outer peripheral wall of the second pole piece 4, and an O-ring is provided in the annular groove. The O-ring is for preventing the chamber to be sealed from communicating with the outside through the gap between the second pole piece 4 and the casing 1.

In some embodiments, the portion of the reciprocating shaft 2 facing the first magnetic powder block 61 and the second magnetic powder block 71 is provided with a surface treatment layer or is made of a wear resistant material. It is understood that at least a part of the surface of the reciprocating shaft 2 is a wear-resistant material or a surface-treated surface-treated layer. At least a part is a part that can come into contact with the magnetic particle block. In this way, the hardness and wear resistance of the reciprocating shaft 2 are improved.

In order to achieve the above effect, the reciprocating shaft 2 may be a combination of a plurality of shaft segments, or may have an integral structure. As shown in FIG. 1, the reciprocating shaft 2 includes a left segment, a first wear-resistant segment, an intermediate segment, a second wear-resistant segment, and a right segment so as to be connected in this order. Here, the first wear-resistant segment and the second wear-resistant segment are made of 45 steel. The left segment, middle segment, and right segment are machined from Q235 steel. Also, these segments are connected by screws. When installed in this way, the material cost can be reduced. As shown in FIG. 5, since the reciprocating shaft 2 has an integral structure, the cost can be reduced by processing by the surface treatment method. Surface treatment methods include carburizing, nitriding, chrome plating, surface quenching, shot peening and the like.

In some embodiments, the magnetic particle sealing device further comprises a lip sealing ring 8, the casing 1 having a first insertion hole and a second insertion hole through which the reciprocating shaft 2 is inserted, and a first insertion hole and a second insertion hole. An annular groove into which the lip seal ring 8 is fitted is provided on any inner peripheral surface of the hole. Therefore, the sealing method that combines the magnetic powder seal and the lip seal reduces the contamination of the external operating environment by the magnetic powder without the magnetic powder deviating from the sealing gap easily separating from the casing 1, and has a highly reliable sealing effect. It will be realized.

In the magnetic powder sealing device according to the embodiment of the present disclosure, the structure of the casing 1 may be an integral structure, but the casing 1 may be installed in a separated structure in order to facilitate mounting. Alternatively, the casing 1 may be provided with an opening and the end lid 11 may be additionally installed.

Hereinafter, the magnetic particle sealing device used for the reciprocating shaft 2 in the specific example according to the present disclosure will be described with reference to FIGS. 1 to 3.

As shown in FIGS. 1 and 2, the magnetic particle sealing device used for the reciprocating shaft 2 in the embodiment according to the present disclosure includes a casing 1, a reciprocating shaft 2, a first pole piece 3, a second pole piece 4, and the like. It includes a permanent magnet 5, a first magnetic particle replenishment unit 6, and a second magnetic particle replenishment unit 7.

The right end of the casing 1 is open, and an end lid 11 is provided at the opening. The left end of the casing 1 has a first insertion hole, and the end lid 11 has a second insertion hole. The reciprocating shaft 2 penetrates the first insertion hole and the second insertion hole. An annular groove into which the lip seal ring 8 is fitted is provided on the inner peripheral surfaces of both the first insertion hole and the second insertion hole. Both the first pole piece 3 and the second pole piece 4 are set on the outer peripheral side of the reciprocating shaft 2 and are located inside the casing 1. The outer peripheral wall of the first pole piece 3 abuts on the inner peripheral wall of the casing 1. The outer peripheral wall of the second pole piece 4 abuts on the inner peripheral wall of the casing 1. A permanent magnet 5 is provided between the first pole piece 3 and the second pole piece 4, and the permanent magnet 5 does not come into contact with the casing 1. The permanent magnet 5, the first pole piece 3, the magnetic powder, the reciprocating shaft 2, and the second pole piece 4 form a magnetic circuit to generate a stable magnetic field. The first pole piece 3 has a plurality of first pole teeth 31 and the second pole piece 4 has a plurality of second pole teeth 41. The first pole teeth 31 and the second pole teeth 41 adsorb magnetic powder by the action of a magnetic field force, and the magnetic powder is filled in the seal gap to perform a sealing action.

The first pole piece 3 has a first containment cavity. A first magnetic particle replenishment unit 6 is provided in the first accommodation cavity. The second pole piece 4 has a second containment cavity. A second magnetic particle replenishment unit 7 is provided in the second accommodation cavity.

The first magnetic particle replenishment unit 6 includes a first magnetic particle block 61, a first magnetic particle block 62, and a first operating member. The first magnetic powder block 61 and the first demagnetized block 62 are provided in the first accommodating cavity. The first operating member is connected to the first demagnetized block 62 through the casing 1, and the first demagnetized block 62 is connected to the first magnetic powder block 61. The second magnetic particle replenishment unit 7 includes a second magnetic particle block 71, a second magnetic particle block 72, and a second operating member. The second magnetic powder block 71 and the second demagnetized block 72 are provided in the second accommodating cavity. The second operating member is connected to the second demagnetized block 72 through the casing 1, and the second demagnetized block 72 is connected to the second magnetic particle block 71.

The first operating member has a first end portion 63, a first connecting rod 64, and a first return spring 65. One end of the first connection rod 64 is connected to the first end portion 63, and the other end is connected to the first demagnetized block 62 through the casing 1 and the first pole piece 3. The first connecting rod 64 can move along its length direction. The first return spring 65 comes into contact with the first end portion 63 and the casing 1 between the first end portion 63 and the casing 1 and is set on the outer peripheral side of the first connection rod 64. A first spacer 66 is provided on the side of the first demagnetized block 62 near the first pole piece 3. The first spacer 66 is set on the outer peripheral side of the first connecting rod 64. The second operating member has a second end portion 73, a second connecting rod 74, and a second return spring 75. One end of the second connection rod 74 is connected to the second end portion 73, and the other end is connected to the second demagnetized block 72 through the casing 1 and the second pole piece 4. The second connecting rod 74 can move along its length direction. The second return spring 75 comes into contact with the second end portion 73 and the casing 1 between the second end portion 73 and the casing 1 and is set on the outer peripheral side of the second connection rod 74. A second spacer 76 is provided on the side of the second demagnetized block 72 near the second pole piece 4. The second spacer 76 is set on the outer peripheral side of the second connecting rod 74.

The reciprocating shaft 2 includes a left segment, a first wear-resistant segment, an intermediate segment, a second wear-resistant segment, and a right segment so as to be connected in this order. Here, the first wear-resistant segment and the second wear-resistant segment are made of 45 steel. The left segment, middle segment, and right segment are machined from Q235 steel. And the two adjacent segments are connected by screws.

As shown in FIGS. 2 and 3 (the direction indicated by the arrow C in FIG. 3 is the urging direction), when it is necessary to replenish the magnetic powder in the seal gap corresponding to the first pole teeth 31, the first end portion. By simply pushing 63, the first connecting rod 64 moves from the second position to the first position, the first magnetic powder block 61 contacts the first wear-resistant segment, and the reciprocating shaft 2 reciprocates the first magnetic powder. It rubs against the block 61 to cause the first magnetic powder block 61 to generate magnetic powder. The magnetic powder flows into the seal gap of the first pole teeth 31 by the action of the magnetic field force to complete the self-replenishment of the magnetic powder. At this time, the user opens the first end portion 63, the first operating member returns to the second position by the action of the first return spring 65, the first magnetic powder block 61 is separated from the reciprocating shaft 2, and the magnetic powder is released. Do not generate.

In the description of the present disclosure, "center", "vertical", "horizontal", "length", "width", "thickness", "top", "bottom", "front", "rear", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", "Diameter" The orientation or positional relationship indicated by terms such as "direction" and "circumferential direction" is an orientation or positional relationship based on the drawings, and is merely for facilitating the description of the present disclosure or for simplifying the description. , It is understood that it should not be understood as limiting this disclosure as it is not intended to indicate or imply that the device or component always has a particular orientation and that it is configured or operated in a particular orientation. Should be.

Also, the terms "first" and "second" are used only to describe the purpose, to indicate or imply relative importance, or to imply the number of technical features shown. Should not be understood as a thing. Thus, the features limited by "first" and "second" can indicate or imply that they have at least one such feature. In the description of the present disclosure, "plurality" is at least two, for example two or three, unless there is a clear and specific limitation.

In this disclosure, terms such as "attach," "connect," "connect," and "fix" should be understood in a broad sense, unless expressly specified or limited. For example, unless otherwise specified, they may be fixedly connected, detachably connected, or integrally, and mechanically connected or electrically. They may be connected, may be communicable with each other, may be directly connected, or may be indirectly connected via an intermediate intermediary, and may be internally communicated between two parts or two parts. It may be an interaction relationship of. One of ordinary skill in the art can understand the specific meanings of the above terms in the present disclosure depending on the specific circumstances.

In the present disclosure, unless there is a clear provision or limitation, the fact that the first feature is "above" or "below" the second feature means that the first feature and the second feature come into direct contact with each other. It may be present, or the first feature and the second feature may be indirect contact via an intermediate medium. Further, the fact that the first feature is "above", "above", and "upper" of the second feature may mean that the first feature is directly above or diagonally above the second feature, or It may simply indicate that the horizontal height of the first feature is higher than the horizontal height of the second feature. The fact that the first feature is "below," "down," and "bottom" of the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply the first. It may be shown that the horizontal height of the feature is lower than the horizontal height of the second feature.

In the present disclosure, the specific examples described with reference to the examples or examples such as "one example", "several examples", "exemplifications", "concrete examples" or "some examples". Features, configurations, materials or points are included in at least one example or example of the present disclosure. In the present specification, the schematic description of the above terms does not necessarily have to be for the same embodiment or example. Also, the specific features, configurations, materials or points described may be appropriately combined in any or more embodiments or examples. Moreover, if not inconsistent with each other, one of ordinary skill in the art may combine different examples or examples, different examples or exemplary features herein.

Although the embodiments of the present disclosure have been described in the preamble, the above embodiments are exemplary and should not be understood as limiting the disclosure. It is understood that those skilled in the art may modify, modify, replace or modify the above embodiments within the scope of the present disclosure.

1 Casing 11 End lid 2 Reciprocating shaft 3 1st pole piece 31 1st pole tooth 4 2nd pole piece 41 2nd pole tooth 5 Permanent magnet 6 1st magnetic powder replenishment unit 61 1st magnetic powder block 62 1st demagnetized block 63 1 End part 64 1st connection rod 65 1st return spring 66 1st spacer 7 2nd magnetic particle replenishment unit 71 2nd magnetic powder block 72 2nd demagnetization block 73 2nd end part 74 2nd connection rod 75 2nd return spring 76 2nd spacer 8 Lip seal ring

Claims (10)

Casing and
A reciprocating shaft that penetrates the casing and is capable of reciprocating with respect to the casing along the axial direction of the reciprocating shaft.
A first pole piece provided in the casing and set on the outer peripheral side of the reciprocating shaft, and
A second pole piece provided in the casing and set on the outer peripheral side of the reciprocating shaft, and
A permanent magnet provided in the casing and set on the outer peripheral side of the reciprocating shaft,
A first magnetic particle replenishment unit including a first magnetic particle block, and
A plurality of first pole teeth arranged at intervals along the axial direction of the reciprocating shaft are provided on the inner peripheral wall of the first pole piece, and the tip surface of the teeth of the first pole teeth and the said A magnetic powder for sealing is provided between the reciprocating shaft and the outer peripheral surface, and the first pole piece has a first accommodating cavity.
A plurality of second pole teeth arranged at intervals along the axial direction of the reciprocating shaft are provided on the inner peripheral wall of the second pole piece, and the tip surface of the teeth of the second pole teeth and the said The magnetic powder is provided between the reciprocating shaft and the outer peripheral surface of the reciprocating shaft.
The permanent magnet is located between the first pole piece and the second pole piece.
The permanent magnet, the first pole piece, the magnetic powder, the reciprocating shaft, and the second pole piece form a magnetic circuit.
The first magnetic particle block is provided in the first accommodating cavity and is movable between the first position and the second position.
At the first position, the first magnetic powder block comes into contact with the outer peripheral surface of the reciprocating shaft and rubs against the reciprocating shaft to generate magnetic powder, thereby causing the first pole teeth to be between the reciprocating shaft. Replenish the magnetic powder,
At the second position, the first magnetic particle block is separated from the outer peripheral surface of the reciprocating shaft.
A magnetic particle sealing device used for a reciprocating shaft. The first magnetic particle replenishment unit further includes a first operating member and a first demagnetizing block.
One end of the first operating member is inserted into the casing and the first pole piece, inserted into the first accommodating cavity, and connected to the first magnetic particle block.
The first magnetic block is provided between the first pole piece and the first magnetic particle block.
The first operating member is connected to the first magnetic powder block via the first demagnetizing block.
The magnetic powder sealing device used for the reciprocating shaft according to claim 1. The first operating member is
The first end portion located on the outside of the casing and
One end is connected to the first end portion, the other end is inserted into the first accommodating cavity through the casing and the first pole piece, and the first connecting rod connected to the first demagnetized block. ,
2. The magnetic powder sealing device used for the reciprocating shaft according to claim 2. The first connecting rod can move with respect to the casing and the first pole piece along the length direction of the first connecting rod.
The first operating member comes into contact with the first end portion and the casing between the first end portion and the casing, and the first return spring is set on the outer peripheral side of the first connecting rod. Have more,
The magnetic powder sealing device used for the reciprocating shaft according to claim 3. The first connecting rod is connected to the casing by a screw, and the first connecting rod is connected to the casing.
The first demagnetized block is rotatably connected to the first connecting rod,
A limit groove extending along the length direction of the first connecting rod is provided on the inner wall surface of the first accommodating cavity portion.
The first demagnetized block is movably fitted into the limit groove.
The magnetic powder sealing device used for the reciprocating shaft according to claim 3. In the axial direction of the first connecting rod, a first spacer is further provided between the first demagnetized block and the first pole piece and surrounding the first connecting rod.
The magnetic powder sealing device used for the reciprocating shaft according to any one of claims 3 to 5, wherein the magnetic powder sealing device is used. The portion of the reciprocating shaft facing the first magnetic particle block is provided with a surface treatment layer or is manufactured of an wear-resistant material.
The magnetic powder sealing device used for the reciprocating shaft according to any one of claims 1 to 5. The second pole piece has a second containment cavity and
The magnetic particle sealing device further includes a second magnetic particle replenishment unit including a second magnetic particle block.
The second magnetic particle block is provided in the second accommodating cavity and can be moved between the third position and the fourth position.
At the third position, the second magnetic powder block comes into contact with the outer peripheral surface of the reciprocating shaft and rubs against the reciprocating shaft to generate magnetic powder, thereby causing the second pole teeth to be between the reciprocating shaft. Replenish the magnetic powder,
At the fourth position, the second magnetic particle block is separated from the outer peripheral surface of the reciprocating shaft.
The magnetic powder sealing device used for the reciprocating shaft according to any one of claims 1 to 5. The second magnetic particle replenishment unit further includes a second operating member and a second demagnetizing block.
One end of the second operating member is inserted into the second accommodating cavity through the casing and the second pole piece, and is connected to the second magnetic particle block.
The second operating member is connected to the second magnetic powder block via the second demagnetizing block.
The magnetic powder sealing device used for the reciprocating shaft according to claim 8. With more lip seal ring,
The casing has a first insertion hole and a second insertion hole through which the reciprocating shaft is inserted.
Wherein the both of the inner peripheral surface of the first insertion hole and the second insertion hole, said lip seal ring is fitted write Murrell annular groove provided,
The magnetic powder sealing device used for the reciprocating shaft according to any one of claims 1 to 5.

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