CN114382894B - Dynamic pressure type magnetic liquid sealing device - Google Patents
Dynamic pressure type magnetic liquid sealing device Download PDFInfo
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- CN114382894B CN114382894B CN202111534564.XA CN202111534564A CN114382894B CN 114382894 B CN114382894 B CN 114382894B CN 202111534564 A CN202111534564 A CN 202111534564A CN 114382894 B CN114382894 B CN 114382894B
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- ring
- annular
- rotating shaft
- dynamic pressure
- sealing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/3452—Pressing means the pressing force resulting from the action of a spring
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/38—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member sealed by a packing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention discloses a dynamic pressure type magnetic liquid sealing device, which comprises: the device comprises a shell, a rotating shaft, a moving ring, a static ring and a dynamic pressure groove; the rotating shaft penetrates through the shell along the axial direction of the rotating shaft, and at least part of the rotating shaft is positioned in the inner cavity; the movable ring is rotatably arranged in the inner cavity, the movable ring is sleeved on the rotating shaft, and the movable ring is connected with the rotating shaft in a sealing way; the static ring is sleeved on the rotating shaft and is connected with the shell, the movable ring is provided with a first sealing surface which is adjacent to the static ring in the axial direction of the rotating shaft, one of the first sealing surface and the second sealing surface comprises a dam area and a groove area, at least one of the movable ring and the static ring comprises an annular magnet, and the annular magnet is sleeved on the rotating shaft so that magnetic liquid is absorbed between the first sealing surface and the second sealing surface; the dynamic pressure groove is plural, and plural dynamic pressure grooves are provided on the groove region of one of the first seal surface and the second seal surface. The dynamic pressure type magnetic liquid sealing device has the advantage of good sealing effect.
Description
Technical Field
The invention relates to the technical field of mechanical engineering sealing, in particular to a dynamic pressure type magnetic liquid sealing device.
Background
Magnetic liquid seals are widely used because of their advantages of zero leakage, long life, low friction, etc. The magnetic liquid sealing device in the related art is used for sealing a rotating shaft by filling magnetic liquid between the rotating ring and the static ring, but the pressure resistance of the magnetic liquid sealing device in the related art is general, and the sealing effect of the sealing device under high external load is poor.
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 a dynamic pressure type magnetic liquid sealing device which has the advantage of good sealing effect.
The dynamic pressure type magnetic liquid sealing device of the embodiment of the present invention comprises: a housing having an interior cavity; the rotating shaft penetrates through the shell along the axial direction of the rotating shaft, and at least part of the rotating shaft is positioned in the inner cavity; the movable ring is rotatably arranged in the inner cavity, the movable ring is sleeved on the rotating shaft, and the movable ring is connected with the rotating shaft in a sealing manner; a stationary ring fitted around the rotating shaft, the stationary ring being located between the moving ring and the housing in an axial direction of the rotating shaft, and the stationary ring being connected to the housing, at least a portion of at least one of the moving ring and the stationary ring being movable in the axial direction of the rotating shaft, wherein the moving ring has a first sealing surface adjacent to the stationary ring in the axial direction of the rotating shaft, the stationary ring has a second sealing surface adjacent to the moving ring in the axial direction of the rotating shaft, one of the first sealing surface and the second sealing surface includes a dam region disposed adjacent to an outer edge of one of the first sealing surface and the second sealing surface and a groove region disposed adjacent to an inner edge of one of the first sealing surface and the second sealing surface, at least one of the moving ring and the stationary ring includes an annular magnet, the annular magnet is sleeved on the rotating shaft, so that magnetic liquid is adsorbed between the first sealing surface and the second sealing surface; a plurality of dynamic pressure grooves provided on the groove region of one of the first seal surface and the second seal surface, the plurality of dynamic pressure grooves being provided at intervals in the circumferential direction of the rotating shaft, the cross-sectional area of the dynamic pressure groove decreasing in a direction away from the inner edge of the one of the first seal surface and the second seal surface.
According to the dynamic pressure type magnetic liquid sealing device provided by the embodiment of the invention, the dynamic pressure groove is formed in the first sealing surface or the second sealing surface, so that the pressure of the magnetic liquid in the dam region is increased when the rotating ring rotates, the magnetic liquid can resist larger external fluid pressure, the pressure resistance of the magnetic liquid in the dam region is further improved, and the sealing effect is improved.
Therefore, the dynamic pressure type magnetic liquid sealing device has the advantage of good sealing effect.
In some embodiments, at least one of the moving ring and the static ring further includes an annular sealing sheet, the annular sealing sheet is sleeved on the rotating shaft, at least one of the moving ring and the static ring includes a mounting surface, one side of the annular magnet in the thickness direction is disposed on the mounting surface, the one side of the annular magnet is in sealing connection with the mounting surface, the annular sealing sheet is disposed on the other side of the annular magnet in the thickness direction, and the annular sealing sheet includes a first surface, and the first surface forms the first sealing surface or the second sealing surface.
In some embodiments, the rotating ring comprises the mounting surface and the annular sealing sheet, the annular sealing sheet is sleeved on the rotating shaft, one side in the thickness direction of the annular magnet is arranged on the mounting surface, and the other side in the thickness direction of the annular magnet is in contact with at least part of the annular sealing sheet.
In some embodiments, the rotating ring includes a first guide seat, a first annular slider, and a first elastic element, the mounting surface is located on the first annular slider, the first guide seat is sleeved and fixed on the rotating shaft, the first guide seat is in sealed connection with the rotating shaft, the first annular slider is slidably arranged on the first guide seat in the axial direction of the rotating shaft, and the first annular slider is in sealed connection with the first guide seat; one end of the first elastic piece is abutted against the first guide seat, and the other end of the first elastic piece is abutted against the first annular sliding block.
In some embodiments, the first guide holder includes a first ring member provided on a side of the first guide holder adjacent to the stationary ring in an axial direction of the rotating shaft, the first ring member being coaxial with the rotating shaft, at least a portion of an inner peripheral surface of the first ring member being in contact with at least a portion of an outer peripheral surface of the first annular slider, or at least a portion of an outer peripheral surface of the first ring member being in contact with at least a portion of an inner peripheral surface of the first annular slider,
in some embodiments, the dynamic pressure type magnetic liquid sealing device further includes a first sealing ring, a first annular groove is provided on one of the first ring-shaped member and the first annular slider, the first sealing ring is disposed in the first annular groove, and the other of the first annular slider and the first ring-shaped member is in contact with the first sealing ring, a first slot is provided on one of the first guide seat and the first annular slider, and a first plug-in connector which is engaged with the first slot is provided on the other of the first guide seat and the first annular slider, so that the first guide seat and the first annular slider synchronously rotate along the circumferential direction of the rotating shaft.
In some embodiments, the stationary ring includes the mounting surface and the annular sealing piece, the annular sealing piece is sleeved on the rotating shaft, one side in the thickness direction of the annular magnet is arranged on the mounting surface, and the other side in the thickness direction of the annular magnet is connected with at least part of the annular sealing piece.
In some embodiments, the stationary ring includes a second guide seat, a second annular slider, and a second elastic member, the second guide seat is disposed on the housing, the second guide seat is sleeved on the rotating shaft, the second annular slider is slidably connected to the second guide seat in the axial direction of the rotating shaft, the second annular slider is in sealed connection with the second guide seat, one end of the second elastic member abuts against the second guide seat, and the other end of the second elastic member abuts against the second annular slider.
In some embodiments, the dynamic pressure type magnetic liquid sealing device further includes a second seal ring, the second guide seat includes a second ring member, the second ring member is provided on a side of the second guide seat adjacent to the rotating ring in the axial direction of the rotating shaft, the second ring member is coaxial with the rotating shaft, at least a portion of an inner peripheral surface of the second ring member is in contact with at least a portion of an outer peripheral surface of the second ring slider, or at least a portion of an outer peripheral surface of the second ring member is in contact with at least a portion of an inner peripheral surface of the second ring slider, the second ring member includes a second annular groove, the second seal ring is provided in the second annular groove, and the second seal ring is in contact with the second ring slider.
In some embodiments, one of the second guide seat and the second annular slider is provided with a second slot, and the other of the second guide seat and the second annular slider is provided with a second plug connector matched with the second slot.
Drawings
Fig. 1 is a schematic structural view of a dynamic pressure type magnetic liquid seal device of an embodiment of the present invention.
Fig. 2 is a schematic view of the configuration of the first sealing surface or the second sealing surface according to an embodiment of the present invention.
Fig. 3 is a schematic view of the configuration of the first sealing surface or the second sealing surface of an embodiment of the present invention.
Fig. 4 is a schematic structural view of a dynamic pressure type magnetic liquid seal device of an embodiment of the present invention.
Fig. 5 is a schematic structural view of a dynamic pressure type magnetic liquid seal device of an embodiment of the present invention.
Fig. 6 is a schematic structural view of a dynamic pressure type magnetic liquid seal device of an embodiment of the present invention.
Reference numerals:
a housing 1;
a rotating shaft 2; a first jack 201;
a rotating ring 3; a first sealing surface 30; a first guide seat 31; a first ring member 311; a first annular groove 3111; a first slot 3112; a first seat 312; a second insertion hole 313; a first annular slider 32; a first plug 3201; a first elastic member 33; a first seal ring 34;
a stationary ring 4; a second sealing surface 40; a second guide holder 41; a second annular member 411; a second annular groove 4111; a second slot 4112; a second seat 412; a second annular slider 42; a second connector 4201; the second elastic member 43; a second seal ring 44;
a ring-shaped sealing sheet 5; a trough area 501; dynamic pressure grooves 5011; first end 50111; second end 50112; a dam area 502;
a ring magnet 6; a magnetic liquid 7; and a connecting piece 8.
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 accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
The dynamic pressure type magnetic liquid sealing device of the embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1 to 5, the dynamic pressure type magnetic liquid seal device according to the embodiment of the present invention comprises a housing 1, a rotating shaft 2, a moving ring 3, a stationary ring 4 and a dynamic pressure groove 5011.
The housing 1 has an inner cavity (not shown in the figures), in particular, the inner cavity can contain a medium to be sealed, such as a gas or a liquid.
The rotating shaft 2 is disposed through the housing 1 along an axial direction (i.e., a left-right direction in fig. 1), and at least a portion of the rotating shaft 2 is located in the inner cavity.
The movable ring 3 is rotatably arranged in the inner cavity, the movable ring 3 is sleeved on the rotating shaft 2, the movable ring 3 is hermetically connected with the rotating shaft 2, and it should be noted that the movable ring 3 is rotatably arranged in the inner cavity, that is, when the rotating shaft 2 rotates, the movable ring 3 synchronously rotates along with the rotating shaft 2 in the inner cavity, and when the rotating shaft 2 stops rotating, the movable ring 3 stops rotating in the inner cavity.
The static ring 4 is sleeved on the rotating shaft 2, the static ring 4 is positioned between the dynamic ring 3 and the shell 1 in the axial direction of the rotating shaft 2, the static ring 4 is connected with the shell 1, at least part of at least one of the dynamic ring 3 and the static ring 4 can move along the axial direction of the rotating shaft 2, that is, at least part of the dynamic ring 3 can move along the axial direction of the rotating shaft 2; alternatively, at least a part of the stationary ring 4 may move in the axial direction of the rotating shaft 2; alternatively, at least a part of the moving ring 3 may be movable in the axial direction of the rotating shaft 2, and at least a part of the stationary ring 4 may be movable in the axial direction of the rotating shaft 2.
Further, at least a part of the rotating ring 3 is movable in the axial direction of the rotating shaft 2, which means that the rotating ring 3 as a whole is movable in the axial direction of the rotating shaft 2, or alternatively, a part of the components of the rotating ring 3 is movable in the axial direction of the rotating shaft 2. The fact that at least a part of the stationary ring 4 is movable in the axial direction of the rotating shaft 2 means that the stationary ring 4 as a whole is movable in the axial direction of the rotating shaft 2, or that a part of the assembly of the stationary ring 4 is movable in the axial direction of the rotating shaft 2.
As shown in fig. 1, the moving ring 3 has a first sealing surface 30 adjacent to the stationary ring 4 in the axial direction of the rotating shaft 2, and the stationary ring 4 has a second sealing surface 40 adjacent to the moving ring 3 in the axial direction of the rotating shaft 2, it is understood that the fluid pressure generated by the sealed medium in the inner cavity can press the moving ring 3 and the stationary ring 4 in the axial direction of the rotating shaft 2 to bring the first sealing surface 30 and the second sealing surface 40 into contact.
At least one of the moving ring 3 and the stationary ring 4 comprises a ring magnet 6, that is, the moving ring 3 comprises a ring magnet 6, or the stationary ring 4 comprises a ring magnet 6, or both the moving ring 3 and the stationary ring 4 comprise a ring magnet 6. The annular magnet 6 is fitted over the shaft 2 so that the magnetic liquid 7 is attracted between the first sealing surface 30 and the second sealing surface 40.
It can be understood that, the rotating ring 3 is connected with the rotating shaft 2 in a sealing manner, optionally, the rotating ring 3 is sealed with the rotating shaft 2 by a sealing ring, so that it is ensured that the sealed medium in the inner cavity cannot leak from the gap between the inner circumferential surface of the rotating ring 3 and the outer circumferential surface of the rotating shaft 2, and the magnetic liquid 7 is adsorbed between the first sealing surface 30 of the rotating ring 3 and the second sealing surface 40 of the stationary ring 4 by the annular magnet 6, and when the rotating ring 3 rotates along with the rotating shaft 2 and the rotating shaft 2 stops rotating, the sealed medium cannot leak from the gap between the first sealing surface 30 of the rotating ring 3 and the second sealing surface 40 of the stationary ring 4.
One of the first and second sealing surfaces 30, 40 includes a dam region 502 and a trough region 501, the dam region 502 being disposed adjacent an outer edge of the one of the first and second sealing surfaces 30, 40, and the trough region 501 being disposed adjacent an inner edge of the one of the first and second sealing surfaces 30, 40.
That is, the trough region 501 is an annular region adjacent an inner edge of the first sealing surface 30 or the second sealing surface 40, and the dam region 502 is an annular region adjacent an outer edge of the first sealing surface 30 or the second sealing surface 40, specifically, the trough region 501 and the dam region 502 form the first sealing surface 30 or the second sealing surface 40.
The dynamic pressure groove 5011 is plural, plural dynamic pressure grooves 5011 are provided on the groove region 501 of one of the first sealing surface 30 and the second sealing surface 40, the plural dynamic pressure grooves 5011 are provided at intervals in the circumferential direction of the rotating shaft 2, and the cross sectional area of the dynamic pressure groove 5011 decreases in a direction away from the inner edge of one of the first sealing surface 30 and the second sealing surface 40.
Specifically, the dynamic pressure groove 5011 includes a first end 50111 and a second end 50112, wherein one end of the dynamic pressure groove 5011 adjacent to the rotational shaft 2 in the axial direction of the rotational shaft 2 is the first end 50111, and one end of the dynamic pressure groove 5011 distant from the rotational shaft 2 in the axial direction of the rotational shaft 2 is the second end 50112.
The dynamic pressure groove 5011 is filled with a magnetic liquid 7.
It can be understood that when the shaft 2 rotates, the moving ring 3 rotates synchronously with the shaft 2, and the magnetic liquid 7 in the dynamic pressure groove 5011 forms a shear flow moving from the first end 50111 of the dynamic pressure groove 5011 to the second end 50112 of the dynamic pressure groove 5011 under the action of the hydrodynamic pressure. When the magnetic liquid 7 moves from the first end 50111 of the dynamic pressure groove 5011 to the second end 50112 of the dynamic pressure groove 5011, the area of the cross section of the dynamic pressure groove 5011 is reduced, that is, the flow path area is reduced, the kinetic energy of the magnetic liquid 7 in the dynamic pressure groove 5011 is converted into pressure, and further the pressure of the magnetic liquid 7 in the local area of the second end 50112 of the dynamic pressure groove 5011 is increased, and the plurality of dynamic pressure grooves 5011 are arranged along the axial direction of the rotating shaft 2, so that the magnetic liquid 7 forms an "O" shaped high-pressure sealing area in the annular area where the dam area 502 is adjacent to the dynamic pressure groove 5011, and therefore the magnetic liquid 7 in the area of the dam area 502 can resist a larger fluid pressure, ensuring that the sealed medium in the inner cavity cannot leak from between the first sealing surface 30 and the second sealing surface 40, and the pressure resistance is improved.
Further, when the magnetic liquid 7 moves from the first end 50111 of the dynamic pressure groove 5011 to the second end 50112 of the dynamic pressure groove 5011, the kinetic energy of the magnetic liquid 7 in the dynamic pressure groove 5011 is converted into pressure, and further, when the pressure of the magnetic liquid 7 is greater than the fluid pressure acted on the rotating ring 3 by the sealing medium, the magnetic liquid 7 can push the rotating ring 3 away from the stationary ring 4 by a certain distance in the axial direction of the rotating shaft 2, thereby avoiding the mutual friction between the first sealing surface 30 and the second sealing surface 40 when the rotating ring 3 rotates, and causing the dynamic pressure groove 5011 to wear out and fail.
Therefore, the dynamic pressure type magnetic liquid sealing device provided by the embodiment of the invention has the advantages of good sealing effect and long service life.
It should be noted that, the distance between the first sealing surface 30 and the second sealing surface 40 after being pushed away is small, and in general, the distance between the first sealing surface 30 and the second sealing surface 40 is between 2 micrometers and 20 micrometers, so that the sealing effect of the dynamic pressure type magnetic liquid sealing device according to the embodiment of the present invention is not affected.
In some embodiments, as shown in fig. 2, the width dimension of each of the plurality of dynamic pressure grooves 5011 is kept constant in the length direction, and the depth dimension of each of the plurality of dynamic pressure grooves 5011 is decreased in the direction in which the first end 50111 is directed to the second end 50112, wherein the depth direction of the dynamic pressure groove 5011 coincides with the axial direction of the rotating shaft 2, i.e., is perpendicular to the first sealing surface 30 or the first sealing surface 40.
In some embodiments, as shown in fig. 3, the width dimension of each of the plurality of dynamic grooves 5011 decreases in the direction that the first end 50111 points toward the second end 50112.
It can be understood that when the magnetic fluid 7 moves from the first end 50111 of the dynamic pressure groove 5011 to the second end 50112 of the dynamic pressure groove 5011, the cross-sectional area of the dynamic pressure groove 5011 decreases, the kinetic energy of the magnetic fluid 7 in the dynamic pressure groove 5011 is converted into pressure, thereby increasing the pressure of the magnetic fluid 7 in the local area of the second end 50112 of the dynamic pressure groove 5011, and a plurality of dynamic pressure grooves 5011 are arranged along the axial direction of the rotating shaft 2, so that the magnetic fluid 7 forms an "O" shaped high-pressure sealing area in the dam area 502 in the annular area adjacent to the second end 50112 of the dynamic pressure groove 5011, therefore the magnetic fluid 7 in the dam area 502 can resist larger fluid pressure, ensuring that the sealed medium in the inner cavity cannot leak from between the first sealing surface 30 and the second sealing surface 40, and the pressure resistance is improved.
In some embodiments, as shown in fig. 2 and 3, the first end 50111 of each of the plurality of dynamic pressure grooves 5011 is located on the circumference of the same circle of curvature, the normal to where the first end 50111 of each of the plurality of dynamic pressure grooves 5011 intersects the circumference of the circle of curvature is at a first preset angle α to the length direction of the dynamic pressure grooves 5011, wherein | α | is greater than 0 ° and less than 90 °. Here, as shown in fig. 2 and 3, the rotational direction of the dynamic pressure groove 5011 in the figure is clockwise, whereas the rotational direction of the dynamic pressure groove 5011 is counterclockwise.
Specifically, a plurality of dynamic pressure grooves 5011 are provided on the first sealing surface 30, and when the turning direction of the dynamic pressure grooves 5011 is clockwise, the turning direction of the rotating shaft 2 is a first rotating direction (clockwise as in fig. 2); a plurality of dynamic pressure grooves 5011 are provided on the first sealing surface 30, and when the turning direction of the dynamic pressure grooves 5011 is counterclockwise, the turning direction of the rotating shaft 2 is a second turning direction (counterclockwise as viewed in fig. 2).
Alternatively, a plurality of dynamic pressure grooves 5011 are provided on the second sealing surface 40, and when the turning direction of the dynamic pressure grooves 5011 is clockwise, the turning direction of the rotating shaft 2 is a second turning direction; a plurality of dynamic pressure grooves 5011 are provided on the second sealing surface 40, and when the turning direction of the dynamic pressure grooves 5011 is counterclockwise, the turning direction of the rotating shaft 2 is the first rotating direction.
It can be understood that, as shown in fig. 2, when the movable ring 3 and the stationary ring 4 relatively rotate, the groove wall of the dynamic pressure groove 5011 generates a force perpendicular to the groove wall to the magnetic liquid 7, the first sealing surface 30 or the second sealing surface 40 applies a frictional force to the magnetic liquid 7, and the resultant force of the force applied by the dynamic pressure groove 5011 to the magnetic liquid 7 and the force applied by the first sealing surface 30 or the second sealing surface 40 to the magnetic liquid 7 moves the magnetic liquid 7 from the first end 50111 to the second end 50112.
For example, a plurality of dynamic pressure grooves 5011 are provided on the second sealing surface 40, and when the rotation direction of the dynamic pressure groove 5011 is clockwise, the rotation directions of the rotating shaft 2 and the rotating ring 3 are the second rotation direction, the magnetic liquid 7 at the p point receives a frictional force of the second sealing surface 40 of the rotating ring 3 to the left, the left groove wall of the dynamic pressure groove 5011 applies a force in the upper right direction to the magnetic liquid 7 at the p point, and further the resultant force direction of the force applied by the dynamic pressure groove 5011 to the magnetic liquid 7 at the p point and the frictional force applied by the first sealing surface 30 or the second sealing surface 40 is directed from the first end to the second end, so that the magnetic liquid 7 at the p point affected by the resultant force is moved from the first end 50111 to the second end 50112.
In some embodiments, as shown in fig. 1, at least one of the moving ring 3 and the stationary ring 4 further comprises an annular seal piece 5, that is, the moving ring 3 comprises the annular seal piece 5; alternatively, the stationary ring 4 comprises a ring seal 5; alternatively, the moving ring 3 comprises the annular sealing piece 5 and the stationary ring 4 comprises the annular sealing piece 5.
The annular sealing sheet 5 is sleeved on the rotating shaft 2, at least one of the movable ring 3 and the stationary ring 4 comprises a mounting surface, one side of the annular magnet 6 in the thickness direction (left-right direction in fig. 1) is arranged on the mounting surface, one side of the annular magnet 6 is connected with the mounting surface in a sealing manner, optionally, one side of the annular magnet 6 is sealed with the mounting surface through a sealing ring, the annular sealing sheet 5 is arranged on the other side of the annular magnet 6 in the thickness direction, the annular sealing sheet 5 comprises a first surface, and the first surface forms a first sealing surface 30 or a second sealing surface 40.
That is, the moving ring 3 includes an annular seal piece 5 and a mounting surface, the left side surface of the annular magnet 6 is provided on the mounting surface, and the annular seal piece 5 is provided on the right side surface in the thickness direction of the annular magnet 6; or the static ring 4 comprises an annular sealing sheet 5 and a mounting surface, the right side surface of the annular magnet 6 is arranged on the mounting surface, and the annular sealing sheet 5 is arranged on the left side surface of the annular magnet 6 in the thickness direction; or, the rotating ring 3 comprises an annular sealing sheet 5 and a mounting surface, the left side surface of the annular magnet 6 of the rotating ring 3 is arranged on the mounting surface of the rotating ring 3, the annular sealing sheet 5 of the rotating ring 3 is arranged on the right side surface of the annular magnet 6 of the rotating ring 3 in the thickness direction, the stationary ring 4 comprises the annular sealing sheet 5 and the mounting surface, the right side surface of the annular magnet 6 of the stationary ring 4 is arranged on the mounting surface of the stationary ring 4, and the annular sealing sheet 5 of the stationary ring 4 is arranged on the left side surface of the annular magnet 6 of the stationary ring 4 in the thickness direction.
In some embodiments, as shown in fig. 4, the rotating ring 3 includes a mounting surface and a ring-shaped sealing piece 5, the ring-shaped sealing piece 5 is sleeved on the rotating shaft 2, one side of the ring-shaped magnet 6 in the thickness direction is arranged on the mounting surface, and the other side of the ring-shaped magnet 6 in the thickness direction is in contact with at least part of the ring-shaped sealing piece 5.
Specifically, the dynamic pressure groove 5011 is provided on the first surface of the ring-shaped seal piece 5 of the moving ring 3, and both the dam region 502 and the groove region 501 are located in a region where the ring-shaped magnet 6 and the ring-shaped seal piece 5 correspond to each other in the axial direction of the rotating shaft 2 of the ring-shaped seal piece 5.
It can be understood that the plurality of dynamic pressure grooves 5011 are arranged on the annular sealing piece 5 of the dynamic pressure groove 5013 in the axial direction of the rotating shaft 2, so that the magnetic liquid 7 forms an "O" shaped high pressure sealing area in the dam region 502 in the annular area adjacent to the second end 50112 of the dynamic pressure groove 5011, and therefore the magnetic liquid 7 in the dam region 502 can resist a larger fluid pressure, ensuring that the sealed medium in the cavity cannot leak from between the first sealing surface 30 and the second sealing surface 40, and improving the pressure resistance.
In some embodiments, as shown in fig. 4, the rotating ring 3 includes a first guide seat 31, a first annular sliding block 32 and a first elastic element 33, the mounting surface is located on the first annular sliding block 32, the first guide seat 31 is sleeved and fixed on the rotating shaft 2, that is, the first guide seat 31 rotates synchronously with the rotating shaft 2 and the first guide seat 31 does not move relative to the rotating shaft 2 in the axial direction of the rotating shaft 2, the first guide seat 31 is connected to the rotating shaft 2 in a sealing manner, and optionally, the first guide seat 31 is sealed with the rotating shaft 2 by a sealing ring.
Specifically, the dynamic pressure type magnetic liquid sealing device of the embodiment of the present invention further includes a connecting member 8, the first guide seat 31 is provided with a first insertion hole 201 engaged with the connecting member 8, the rotating shaft 2 is provided with a second insertion hole 313 engaged with the connecting member 8, and the first guide seat 31 and the rotating shaft 2 are engaged with the first insertion hole 201 and the second insertion hole 313 through the connecting member 8, so that the first guide seat 31 and the rotating shaft 2 are fixedly connected.
The first annular sliding block 32 is slidably disposed on the first guide seat 31 in the axial direction of the rotating shaft 2, and the first annular sliding block 32 is connected with the first guide seat 31 in a sealing manner, one end of the first elastic member 33 abuts against the first guide seat 31, and the other end of the first elastic member 33 abuts against the first annular sliding block 32, that is, the first elastic member 33 applies a right elastic force to the first annular sliding block 32.
Specifically, the first guide seat 31 includes a first ring member 311 and a first seat 312, the first ring member 311 is disposed on one side of the first guide seat 31 adjacent to the stationary ring 4 in the axial direction of the rotating shaft 2, the first ring member 311 is coaxial with the rotating shaft 2, the first ring member 311 is disposed on one side of the first seat 312 adjacent to the stationary ring 4 in the axial direction of the rotating shaft 2, at least a portion of an inner circumferential surface of the first ring member 311 contacts at least a portion of an outer circumferential surface of the first ring slider 32, or at least a portion of an outer circumferential surface of the first ring member 311 contacts at least a portion of an inner circumferential surface of the first ring slider 32, so that the first ring slider 32 can move in the axial direction of the rotating shaft 2, and the slider and the first guide seat 31 rotate synchronously with the rotating shaft 2.
It can be understood that, the first guiding seat 31 is fixedly arranged on the rotating shaft 2, when the moving ring 3 is at rest, the resultant force of the elastic force of the first elastic element 33 and the hydrostatic pressure of the sealed medium in the inner cavity closes the first annular sliding block 32 and the stationary ring 4, so that the first sealing surface 30 and the first sealing surface 40 are in contact, and the closing force of the first annular sliding block 32 and the stationary ring 4 is increased, thereby enhancing the sealing effect.
Dynamic pressure type magnetic liquid seal device in some embodiments, as shown in fig. 4, the dynamic pressure type magnetic liquid seal device of the embodiments of the present invention further includes a first seal ring 34, one of the first ring member 311 and the first ring slider 32 is provided with a first annular groove 3111, the first seal ring 34 is disposed in the first annular groove 3111, and the other of the first ring slider 32 and the first ring member 311 is in contact with the first seal ring 34.
It can be understood that the first sealing ring 34 is disposed between the first ring member 311 and the first ring block 32, so as to ensure that the sealed medium does not leak from the gap between the first ring member 311 and the first ring block 32, thereby improving the sealing effect.
In some embodiments, as shown in fig. 4, a first slot 3112 is disposed on one of the first guide seat 31 and the first annular slider 32, and a first connector 3201 engaged with the first slot 3112 is disposed on the other of the first guide seat 31 and the first annular slider 32, so that the first guide seat 31 and the first annular slider 32 rotate synchronously along the circumferential direction of the rotating shaft 2.
Optionally, a first slot 3112 is disposed on the first guide seat 31, and a first plug 3201 engaged with the first slot 3112 is disposed on the first annular slider 32; alternatively, the first annular slider 32 is provided with a first slot 3112, and the first guide seat 31 is provided with a first connector 3201 engaged with the first slot 3112.
In some embodiments, as shown in fig. 5, the stationary ring 4 includes a mounting surface and a ring-shaped sealing piece 5, the ring-shaped sealing piece 5 is sleeved on the rotating shaft 2, one side of the ring-shaped magnet 6 in the thickness direction is arranged on the mounting surface, and the other side of the ring-shaped magnet 6 in the thickness direction is connected with at least part of the ring-shaped sealing piece 5.
Specifically, the dynamic pressure groove 5011 is provided on the first surface of the ring-shaped seal piece 5 of the stationary ring 4, and both the dam region 502 and the groove region 501 are located in a region where the ring-shaped magnet 6 corresponds to the ring-shaped seal piece 5 in the axial direction of the rotating shaft 2 of the ring-shaped seal piece 5.
It can be understood that the plurality of dynamic pressure grooves 5011 are arranged on the annular seal piece 5 of the stationary ring 4 in the axial direction of the rotating shaft 2, so that the magnetic liquid 7 forms an "O" -shaped high-pressure seal region in the region of the dam region 502 radially adjacent to the second end 50112 of the dynamic pressure grooves 5011, and therefore the magnetic liquid 7 in this region of the dam region 502 can resist a larger fluid pressure, ensuring that the sealed medium in the cavity cannot leak from between the first sealing surface 30 and the second sealing surface 40, and improving the pressure resistance.
In some embodiments, as shown in fig. 5, the stationary ring 4 includes a second guide seat 41, a second annular slider 42, and a second elastic member 43, the second guide seat 41 is disposed on the housing 1, the second guide seat 41 is sleeved on the rotating shaft 2, the second annular slider 42 is slidably connected to the second guide seat 41 in the axial direction of the rotating shaft 2, the second annular slider 42 is in sealing connection with the second guide seat 41, one end of the second elastic member 43 abuts against the second guide seat 41, the other end of the second elastic member 43 abuts against the second annular slider 42, that is, the second elastic member 43 applies a temporal leftward elastic force to the second annular slider 42, and the movable ring 3 is fixedly disposed on the rotating shaft 2.
It can be understood that the second guide seat 41 is fixedly arranged on the housing 1, the moving ring 3 is fixedly arranged on the rotating shaft 2, and when the moving ring 3 is at rest, the resultant force of the elastic force of the second elastic member 43 and the hydrostatic pressure of the sealed medium in the inner cavity closes the moving ring 3 and the second annular slider 42, so that the first sealing surface 30 and the first sealing surface 40 are in contact, and the closing force of the moving ring 3 and the second annular slider 42 is increased, thereby enhancing the sealing effect.
In some embodiments, the dynamic pressure type magnetic liquid sealing device of the embodiment of the present invention further includes a second sealing ring 44, the second guide holder 41 includes a second ring member 411 and a second holder body 412, the second ring member 411 is disposed on a side of the second holder body 412 adjacent to the moving ring 3 in the axial direction of the rotating shaft 2, the second ring member 411 is coaxial with the rotating shaft 2, at least a portion of an inner circumferential surface of the second ring member 411 is in contact with at least a portion of an outer circumferential surface of the second ring slider 42, or at least a portion of an outer circumferential surface of the second ring member 411 is in contact with at least a portion of an inner circumferential surface of the second ring slider 42, the second ring member 411 includes a second ring groove 4111, the second sealing ring 44 is disposed in the second ring groove 4111, and the second sealing ring 44 is in contact with the second ring slider 42.
It will be appreciated that the second sealing ring 44 is provided between the second ring 411 and the second ring slide 42, thereby ensuring that the sealed medium does not leak from the gap between the second ring 411 and the second ring slide 42, thus improving the sealing effect.
In some embodiments, as shown in fig. 5, one of the second guide seat 41 and the second ring slider 42 is provided with a second slot 4112, and the other of the second guide seat 41 and the second ring slider 42 is provided with a second socket 4201 engaged with the second slot 4112.
Optionally, a second slot 4112 is disposed on the second guiding seat 41, and a second socket 4201, which is engaged with the second slot 4112, is disposed on the second annular slider 42; alternatively, the second annular slider 42 is provided with a second slot 4112, and the second guide seat 41 is provided with a second connector 4201 engaged with the second slot 4112.
In some embodiments, as shown in fig. 6, the movable ring 3 includes a first guiding seat 31, a first annular sliding block 32, and a first elastic member 33, the mounting surface is located on the first annular sliding block 32, the first guiding seat 31 is sleeved and fixed on the rotating shaft 2, the first guiding seat 31 is connected with the rotating shaft 2 in a sealing manner, the first annular sliding block 32 is slidably arranged on the first guiding seat 31 in the axial direction of the rotating shaft 2, and the first annular sliding block 32 is connected with the first guiding seat 31 in a sealing manner, one end of the first elastic member 33 abuts against the first guiding seat 31, and the other end of the first elastic member 33 abuts against the first annular sliding block 32, that is, the first elastic member 33 applies a right elastic force to the first annular sliding block 32.
The stationary ring 4 includes a second guide seat 41, a second annular slider 42 and a second elastic member 43, the second guide seat 41 is disposed on the casing 1, the second guide seat 41 is sleeved on the rotating shaft 2, the second annular slider 42 is slidably connected to the second guide seat 41 in the axial direction of the rotating shaft 2, the second annular slider 42 is connected to the second guide seat 41 in a sealing manner, one end of the second elastic member 43 abuts against the second guide seat 41, the other end of the second elastic member 43 abuts against the second annular slider 42, that is, the second elastic member 43 applies a time-left elastic force to the second annular slider 42, and the moving ring 3 is fixedly disposed on the rotating shaft 2.
It can be understood that the first guiding seat 31 is fixedly disposed on the rotating shaft 2, and when the rotating ring 3 is stationary, the combined force of the elastic force of the first elastic member 33 and the hydrostatic pressure of the sealed medium in the inner cavity and the second elastic member 43 closes the first annular slider 32 and the second annular slider 42, so that the first sealing surface 30 and the first sealing surface 40 are in contact, and the closing force of the first annular slider 32 and the second annular slider 42 is increased, thereby enhancing the sealing effect.
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 according to specific situations by those of ordinary skill in the art.
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," "example," "specific example," or "some examples" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the 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 dynamic pressure type magnetic liquid seal device characterized by comprising:
a housing having an interior cavity;
the rotating shaft penetrates through the shell along the axial direction of the rotating shaft, and at least part of the rotating shaft is positioned in the inner cavity;
the movable ring is rotatably arranged in the inner cavity, sleeved on the rotating shaft and hermetically connected with the rotating shaft;
a stationary ring sleeved on the rotating shaft, the stationary ring being located between the rotating ring and the housing in the axial direction of the rotating shaft and connected to the housing, at least a part of at least one of the rotating ring and the stationary ring being movable in the axial direction of the rotating shaft,
wherein the rotating ring has a first sealing surface adjacent to the stationary ring in the axial direction of the rotating shaft, the stationary ring has a second sealing surface adjacent to the rotating ring in the axial direction of the rotating shaft,
one of the first and second sealing surfaces includes a dam region disposed adjacent an outer edge of the one of the first and second sealing surfaces and a trough region disposed adjacent an inner edge of the one of the first and second sealing surfaces,
at least one of the movable ring and the static ring comprises an annular magnet, and the annular magnet is sleeved on the rotating shaft so that magnetic liquid is adsorbed between the first sealing surface and the second sealing surface;
a plurality of dynamic pressure grooves provided on the groove region of one of the first seal surface and the second seal surface, the plurality of dynamic pressure grooves being provided at intervals in the circumferential direction of the rotating shaft, the cross-sectional area of the dynamic pressure groove decreasing in a direction away from the inner edge of the one of the first seal surface and the second seal surface.
2. The dynamic pressure type magnetic liquid seal device according to claim 1, wherein at least one of the dynamic ring and the static ring further comprises an annular seal piece which is fitted over the rotating shaft, at least one of the dynamic ring and the static ring comprises a mounting surface on which one side in a thickness direction of the annular magnet is provided and between which the one side of the annular magnet is sealingly connected, and an annular seal piece which is provided on the other side in the thickness direction of the annular magnet, the annular seal piece comprising a first surface which forms the first seal surface or the second seal surface.
3. The dynamic pressure type magnetic liquid seal device according to claim 2, wherein the rotating ring includes the mounting surface and the annular seal piece, the annular seal piece is fitted around the rotating shaft, one side in the thickness direction of the annular magnet is provided on the mounting surface, and the other side in the thickness direction of the annular magnet is in contact with at least part of the annular seal piece.
4. The dynamic pressure type magnetic liquid sealing device according to claim 3, wherein the rotating ring comprises a first guide seat, a first annular slider and a first elastic member, the mounting surface is located on the first annular slider, the first guide seat is sleeved and fixed on the rotating shaft, the first guide seat is connected with the rotating shaft in a sealing manner, the first annular slider is slidably arranged on the first guide seat in the axial direction of the rotating shaft, and the first annular slider is connected with the first guide seat in a sealing manner;
one end of the first elastic piece is abutted against the first guide seat, and the other end of the first elastic piece is abutted against the first annular sliding block.
5. The dynamic pressure type magnetic liquid seal device according to claim 4, wherein the first guide seat comprises a first ring member provided on a side of the first guide seat adjacent to the stationary ring in the axial direction of the rotating shaft, the first ring member being coaxial with the rotating shaft, at least a part of an inner peripheral surface of the first ring member being in contact with at least a part of an outer peripheral surface of the first annular slider, or at least a part of an outer peripheral surface of the first ring member being in contact with at least a part of an inner peripheral surface of the first annular slider.
6. The dynamic pressure type magnetic liquid sealing device according to claim 5, further comprising a first seal ring, wherein one of the first ring member and the first annular slider is provided with a first annular groove, the first seal ring is provided in the first annular groove, and the other of the first annular slider and the first ring member is in contact with the first seal ring,
one of the first guide seat and the first annular sliding block is provided with a first slot, and the other of the first guide seat and the first annular sliding block is provided with a first plug connector matched with the first slot, so that the first guide seat and the first annular sliding block rotate synchronously along the circumferential direction of the rotating shaft.
7. The dynamic pressure type magnetic liquid seal device according to claim 6, wherein the stationary ring includes the mounting surface and the annular seal piece, the annular seal piece is fitted around the rotating shaft, one side in the thickness direction of the annular magnet is provided on the mounting surface, and the other side in the thickness direction of the annular magnet is connected to at least a part of the annular seal piece.
8. The dynamic pressure type magnetic liquid seal device according to claim 7, wherein said stationary ring comprises a second guide seat, a second annular slider and a second elastic member,
the second guide seat is arranged on the shell, the second guide seat is sleeved on the rotating shaft, the second annular sliding block is connected to the second guide seat in a sliding manner in the axial direction of the rotating shaft, and the second annular sliding block is connected with the second guide seat in a sealing manner,
one end of the second elastic piece is abutted against the second guide seat, and the other end of the second elastic piece is abutted against the second annular sliding block.
9. The dynamic pressure type magnetic liquid seal device according to claim 8, further comprising a second seal ring, wherein the second guide seat comprises a second ring member which is coaxial with the rotation shaft, at least a part of an inner peripheral surface of the second ring member is in contact with at least a part of an outer peripheral surface of the second ring slider, or at least a part of an outer peripheral surface of the second ring member is in contact with at least a part of an inner peripheral surface of the second ring slider;
the second annular piece comprises a second annular groove, a second sealing ring is arranged in the second annular groove, and the second sealing ring is in contact with the second annular sliding block.
10. The dynamic pressure type magnetic liquid seal device according to claim 9, wherein a second slot is provided on one of said second guide seat and said second annular slider, and a second plug fitting which is fitted into said second slot is provided on the other of said second guide seat and said second annular slider.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111534564.XA CN114382894B (en) | 2021-12-15 | 2021-12-15 | Dynamic pressure type magnetic liquid sealing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111534564.XA CN114382894B (en) | 2021-12-15 | 2021-12-15 | Dynamic pressure type magnetic liquid sealing device |
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| CN114382894A CN114382894A (en) | 2022-04-22 |
| CN114382894B true CN114382894B (en) | 2022-09-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024153985A1 (en) * | 2023-01-18 | 2024-07-25 | Naghiha Najaf Abadi Saeed | Sealing apparatus for use with a shaft |
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| US5009388A (en) * | 1989-01-06 | 1991-04-23 | Pei Gi Mao | Magnetic-controlled valve for fluid pipelines |
| JPH08219297A (en) * | 1995-02-10 | 1996-08-27 | Mitsubishi Heavy Ind Ltd | Mechanical seal |
| CN103697170A (en) * | 2012-09-28 | 2014-04-02 | 西华大学 | Mechanical sealing device with self supporting type middle differential ring |
| CN206092975U (en) * | 2016-08-15 | 2017-04-12 | 广西科技大学 | Split type labyrinth type device for sealing magnetic fluid |
| CN207111933U (en) * | 2017-09-13 | 2018-03-16 | 新乡职业技术学院 | A kind of sealing device of magnetic machinery |
| CN113653805A (en) * | 2021-08-20 | 2021-11-16 | 清华大学 | Magnetic liquid sealing device |
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2021
- 2021-12-15 CN CN202111534564.XA patent/CN114382894B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5009388A (en) * | 1989-01-06 | 1991-04-23 | Pei Gi Mao | Magnetic-controlled valve for fluid pipelines |
| JPH08219297A (en) * | 1995-02-10 | 1996-08-27 | Mitsubishi Heavy Ind Ltd | Mechanical seal |
| CN103697170A (en) * | 2012-09-28 | 2014-04-02 | 西华大学 | Mechanical sealing device with self supporting type middle differential ring |
| CN206092975U (en) * | 2016-08-15 | 2017-04-12 | 广西科技大学 | Split type labyrinth type device for sealing magnetic fluid |
| CN207111933U (en) * | 2017-09-13 | 2018-03-16 | 新乡职业技术学院 | A kind of sealing device of magnetic machinery |
| CN113653805A (en) * | 2021-08-20 | 2021-11-16 | 清华大学 | Magnetic liquid sealing device |
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| CN114382894A (en) | 2022-04-22 |
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