CN114382893A - Dynamic pressure type self-circulation magnetic liquid sealing device - Google Patents

Dynamic pressure type self-circulation magnetic liquid sealing device Download PDF

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Publication number
CN114382893A
CN114382893A CN202111534561.6A CN202111534561A CN114382893A CN 114382893 A CN114382893 A CN 114382893A CN 202111534561 A CN202111534561 A CN 202111534561A CN 114382893 A CN114382893 A CN 114382893A
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China
Prior art keywords
ring
dynamic pressure
groove
rotating shaft
static
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CN202111534561.6A
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CN114382893B (en
Inventor
李德才
李世聪
李子贤
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Tsinghua University
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Tsinghua University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/40Sealings between relatively-moving surfaces by means of fluid
    • F16J15/43Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/34Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3404Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/34Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3436Pressing means
    • F16J15/3452Pressing means the pressing force resulting from the action of a spring

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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 self-circulation magnetic liquid sealing device, which comprises a shell, a rotating shaft, a static ring, a movable ring and a permanent magnet, wherein the rotating shaft is arranged in the shell, the static ring is sleeved on the rotating shaft, the static ring is provided with a static ring main sealing surface, a flow passage is arranged on the static ring or the flow passage is limited between the static ring and the shell, the flow passage is provided with a first port and a second port, the first port is arranged at the inner side of the second port, the movable ring is sleeved on the rotating shaft, the movable ring is connected with the rotating shaft in a sealing way, the movable ring is provided with a movable ring main sealing surface, the static ring main sealing surface and the movable ring main sealing surface are oppositely arranged, a dynamic pressure groove is arranged on the movable ring main sealing surface, and the first port and the second port can be communicated with the dynamic pressure groove, wherein each of the runner and the dynamic pressure groove is filled with magnetic liquid, the permanent magnet is arranged on the static ring, and the permanent magnet is positioned in a space defined by the runner and the main sealing surface of the static ring. The dynamic pressure type self-circulation magnetic liquid sealing device provided by the embodiment of the invention has the advantages of good sealing effect, long service life and the like.

Description

Dynamic pressure type self-circulation magnetic liquid sealing device
Technical Field
The invention relates to the technical field of mechanical engineering sealing, in particular to a dynamic pressure type self-circulation magnetic liquid sealing device.
Background
Magnetic liquid seals are widely used in more and more industries as a sealing method capable of achieving 'zero leakage'. The working principle is that under the action of the magnetic field generated by the permanent magnet, the magnetic liquid filled between the rotating shaft and the gap at the top end of the pole tooth is concentrated to form an O-shaped ring, so that the gap circulation channel is blocked to achieve the purpose of sealing. However, at the same time, the magnetic liquid seal also has low pressure resistance, which affects the sealing effect, and when the rotating shaft swings in the radial direction, the sealing gap increases, which easily causes the sealing performance of the magnetic liquid to decrease, so a new magnetic liquid seal form is proposed.
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 self-circulation magnetic liquid sealing device with good sealing performance.
The dynamic pressure type self-circulating magnetic liquid sealing apparatus according to an embodiment of the present invention includes:
a housing defining a chamber;
a shaft, a portion of the shaft being rotatably disposed within the chamber;
the static ring is sleeved on the rotating shaft, the static ring is movably arranged in the cavity between an initial position and a working position, the static ring is arranged at a distance from the rotating shaft in the radial direction of the rotating shaft, the static ring is provided with a static ring main sealing surface, a flow passage is arranged on the static ring or a flow passage is limited between the static ring and the shell, the flow passage is provided with a first port and a second port, and the first port is arranged on the inner side of the second port;
the movable ring is sleeved on the rotating shaft and is connected with the rotating shaft in a sealing manner, the movable ring is provided with a movable ring main sealing surface, the static ring main sealing surface and the movable ring main sealing surface are oppositely arranged along the axial direction of the rotating shaft, a dynamic pressure groove is arranged on the movable ring main sealing surface, the first port is communicated with the dynamic pressure groove, the second port can be communicated with the dynamic pressure groove, each of the flow channel and the dynamic pressure groove is filled with magnetic liquid, the static ring main sealing surface of the static ring at the initial position abuts against the movable ring main sealing surface, and the static ring main sealing surface of the static ring at the working position leaves the movable ring main sealing surface; and
the permanent magnet is arranged on the static ring and is positioned in a space defined by the flow channel and the main sealing surface of the static ring.
The dynamic pressure type self-circulation magnetic liquid sealing device provided by the embodiment of the invention has the advantages of good sealing effect, long service life and the like.
In some embodiments, the flow passage includes a first section, a second section, and a third section, each of the first section and the second section extending in an axial direction of the rotation shaft, the third section extending in a radial direction of the rotation shaft, the first section being disposed inside the second section, an inner end of the third section communicating with one end of the first section, an outer end of the third section communicating with one end of the second section, the other end of the first section defining the first port, and the other end of the second section defining the second port.
In some embodiments, the flow channel is provided in plurality, the flow channels are provided in plurality at intervals in the circumferential direction of the rotating shaft, the dynamic pressure groove is provided in plurality, and the dynamic pressure groove is provided in plurality at intervals in the circumferential direction of the rotating shaft.
In some embodiments, the stationary ring is provided with an inner ring groove and an outer ring groove, each of the inner ring groove and the outer ring groove is provided on the stationary ring main seal surface around the rotation shaft, the inner ring groove is provided inside the outer ring groove, a notch of the inner ring groove communicates with an inner end of the dynamic pressure groove, the first port of each of the flow passages is provided on a groove bottom of the inner ring groove, a notch of the outer ring groove is capable of communicating with an outer end of the dynamic pressure groove, and the second port of each of the flow passages is provided on a groove bottom of the outer ring groove.
In some embodiments, the dynamic ring main seal surface includes an annular dynamic pressure generating portion provided inside the static seal portion, and an annular static seal portion on which the dynamic pressure generating groove is provided, the notch of the outer annular groove being provided opposite to the static seal portion in the axial direction of the rotating shaft.
In some embodiments, the depth of the dynamic pressure grooves is 2 micrometers to 20 micrometers. In some embodiments, be equipped with the casing annular on the casing, be equipped with quiet ring annular on the quiet ring, the permanent magnet cover is established on the tank bottom of quiet ring annular, the permanent magnet quiet ring annular with inject the stock solution chamber between the casing annular, the stock solution chamber constitutes the partly of second section, the third section the outer end with stock solution chamber intercommunication.
In some embodiments, the dynamic pressure self-circulating magnetic liquid seal device further comprises:
an elastic member disposed between the housing and the stationary ring, the elastic member being configured to provide an elastic force to the stationary ring toward the movable ring main seal surface;
a positioning post disposed on one of the housing and the stationary ring; and
the positioning groove is formed in the other one of the shell and the static ring, and the positioning column is inserted into the positioning groove so that the static ring is in rotation stop fit with the shell.
In some embodiments, the elastic member is a compression spring, the housing has a housing abutting surface, the stationary ring has a stationary ring abutting surface, the housing abutting surface is disposed opposite to the stationary ring abutting surface in the axial direction of the rotating shaft, one end of the compression spring abuts against the housing abutting surface, and the other end of the compression spring abuts against the stationary ring abutting surface.
In some embodiments, the stationary ring has a compression spring groove with a notch facing the housing abutting surface, and a groove bottom of the compression spring groove forms the stationary ring abutting surface.
Drawings
Fig. 1 is a schematic view of a dynamic pressure type self-circulating magnetic liquid sealing device according to an embodiment of the present invention in an operating state.
Fig. 2 is a schematic view of a dynamic pressure type self-circulating magnetic liquid sealing device according to an embodiment of the present invention in an initial state.
Fig. 3 is a front view of the rotating ring of fig. 1.
Fig. 4 is a front view of the stationary ring of fig. 1.
Reference numerals:
a rotating shaft 1;
a movable ring 2; a dynamic ring primary seal face 20; a dynamic pressure generating portion 201; the dynamic pressure groove 2011; a static seal portion 202;
a stationary ring 3; a stationary ring main seal face 30; an inner annular groove 31; an outer ring groove 32; a flow passage 33; a first section 331; a first port 3310; a second segment 332; a second port 3320; a third section 333; a stationary ring groove 34;
a housing 4; a housing stop surface 41; housing ring groove 42
A liquid storage cavity 5; a permanent magnet 6;
a first seal ring 71; a second seal ring 72; a third seal ring 73;
an elastic member 8; and a positioning column 9.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 to 4, the dynamic pressure type self-circulating magnetic liquid seal device according to the embodiment of the present invention includes a housing 4, a rotating shaft 1, a stationary ring 3, a moving ring 2, a permanent magnet 6, and the like.
The housing 4 defines a chamber in which a portion of the shaft 1 is rotatably disposed.
The static ring 3 is sleeved on the rotating shaft 1, and the static ring 3 is movably arranged in the cavity between the initial position and the working position. The stationary ring 3 is arranged radially of the rotary shaft 1 at a distance from the rotary shaft 1, the stationary ring 3 having a stationary ring main sealing surface 30. A flow passage 33 is provided on the stationary ring 3 or the flow passage 33 is defined between the stationary ring 3 and the housing 4, the flow passage 33 having a first port 3310 and a second port 3320, the first port 3310 being provided inside the second port 3320.
The flow passage 33 provided in the stationary ring 3 or the flow passage 3 defined between the stationary ring 3 and the housing 4 may be understood as: a passage is arranged in the stationary ring 3, and the passage forms a flow passage 33; or, a circulation groove is arranged on the static ring 3, and the circulation groove and the shell 4 jointly define a flow passage 33; alternatively, the housing 4 is provided with a flow channel, which together with the stationary ring 3 defines the flow channel 33.
The rotating shaft 1 is sleeved with the moving ring 2, the moving ring 2 is connected with the rotating shaft 1 in a sealing mode, the moving ring 2 is provided with a moving ring main sealing surface 20, the static ring main sealing surface 30 and the moving ring main sealing surface 20 are oppositely arranged along the axial direction of the rotating shaft 1, at least one of the static ring main sealing surface 30 and the moving ring main sealing surface 20 is provided with a dynamic pressure groove 2011, and the first port 3310 and the dynamic pressure groove 2011 are communicated with the second port 3320 so that the second port 3320 can be communicated with the dynamic pressure groove 2011. The second port 3320 is capable of communicating with the dynamic pressure groove 2011, that is, when the stationary ring 3 is located at the working position, the second port 3320 communicates with the dynamic pressure groove 2011; when the stationary ring 3 is located at the initial position, the second port 3320 may or may not communicate with the dynamic pressure groove 2011.
Wherein each of the flow channel 33 and the dynamic pressure groove 2011 is filled with a magnetic liquid. The stationary ring main seal surface 30 of the stationary ring 3 in the initial position abuts against the moving ring main seal surface 20, in other words, the stationary ring main seal surface 30 of the stationary ring 3 and the moving ring main seal surface 20 of the moving ring 2 abut.
The stationary main seal surface 30 of the stationary ring 3 in the operating position is arranged at a distance from the moving main seal surface 20 in the axial direction of the rotating shaft 1. In other words, there is a space between the stationary ring main seal surface 30 of the stationary ring 3 and the moving ring main seal surface 20 of the moving ring 2.
The permanent magnet 6 is arranged on the stationary ring 3, and the permanent magnet 6 is located in a space defined by the flow passage 33 and the stationary ring main seal surface 30.
In order to make the technical solution of the present application easier to understand, the technical solution of the present application will be further described by taking, as an example, that the axial direction of the rotating shaft 1 coincides with the left-right direction, and the radial direction of the rotating shaft 1 coincides with the inner-outer direction. Here, inward means a direction close to the axis of the rotating shaft 1 in the radial direction of the rotating shaft 1, and outward means a direction away from the axis of the rotating shaft 1 in the radial direction of the rotating shaft 1, and the left-right direction and the inward-outward direction are as shown in fig. 1.
For example, as shown in fig. 1 and 2, the stationary ring 3 is provided on the left side of the moving ring 2, the left end surface of the stationary ring 3 constitutes a stationary ring main seal surface 3030, and the right end surface of the moving ring 2 constitutes a moving ring main seal surface 2020. The first port 3310 and the second port 3320 are provided on the left end surface of the stationary ring 3, and the dynamic pressure groove 2011 is provided on the right end surface of the moving ring 2. An interval is provided between the inner peripheral surface of the stationary ring 3 and the outer peripheral surface of the rotating shaft 1 so that the stationary ring 3 does not rotate with the rotating shaft 1. The inner circumferential surface of the rotating ring 2 is connected with the outer circumferential surface of the rotating shaft 1 in a sealing way, so that the rotating ring 2 rotates along with the rotation of the rotating shaft 1.
As shown in fig. 2, when the stationary ring 3 is located at the initial position (when the rotating shaft 1 does not rotate), the stationary ring main sealing surface 30 abuts against the rotating ring main sealing surface 20, that is, the stationary ring main sealing surface 30 of the stationary ring 3 and the rotating ring main sealing surface 20 of the rotating ring 2 are attached together, so as to realize the sealing between the rotating shaft 1 and the housing 1, and at this time, the magnetic liquid is stored in the flow passage 33 and the dynamic pressure groove 2011 under the action of the permanent magnet 6.
As shown in fig. 1, when the stationary ring 3 is located at the working position (when the rotating shaft 1 rotates), the stationary ring 3 moves rightwards, so that the stationary ring main sealing surface 30 is separated from the moving ring main sealing surface 20, a gap is formed between the stationary ring main sealing surface 30 and the moving ring main sealing surface 20, and at this time, the magnetic liquid is used for realizing the sealing between the rotating shaft 1 and the shell 1.
Specifically, when the stationary ring 3 is located at the working position, the moving ring 2 rotates along with the rotating shaft 1, and due to the relative rotation between the moving ring 2 and the stationary ring 3, the magnetic liquid in the dynamic pressure groove 2011 flows outwards under the action of centrifugal force, and a hydrodynamic pressure effect is formed by the dynamic pressure groove 2011 in the flowing process. At this time, the magnetic liquid at the dynamic pressure groove 2011 gradually forms a stable magnetic liquid film, and the magnetic liquid film has a certain bearing capacity and rigidity, so as to separate the dynamic ring main sealing surface 20 from the static ring main sealing surface 30, so that a gap is formed between the static ring main sealing surface 30 and the dynamic ring main sealing surface 20, and meanwhile, sealing and lubrication between the dynamic ring main sealing surface 20 and the static ring main sealing surface 30 are realized, and further, sealing between the rotating shaft 1 and the housing 4 is realized.
When there is a gap between the stationary ring main seal surface 30 and the moving ring main seal surface 20, the first port 3310 and the second port 3320 are both communicated with the dynamic pressure groove 2011, and at this time, the dynamic pressure groove 2011 is communicated with the magnetic liquid in the flow passage 33, and the magnetic liquid flows into the gap between the stationary ring main seal surface 30 and the moving ring main seal surface 20. And the magnetic liquid film pressure distribution follows the tendency of increasing from the inside to the outside in the radial direction, the pressure outside the dynamic pressure groove 2011 is greater than the pressure inside the dynamic pressure groove 2011. Under the action of the pressure difference, the magnetic liquid in the flow channel 33, the dynamic pressure groove 2011 and the gap enters the flow channel 33 from the second port 3320 and flows out from the first port 3310 of the flow channel 33, and then the magnetic liquid flows outwards along the dynamic pressure groove 2011 under the driving of the moving ring 2 and the action of centrifugal force, and finally enters the second port 3320 to start a new cycle. In the flowing process of the magnetic liquid, the permanent magnet 6 is used for providing magnetic attraction force for the magnetic liquid, and the magnetic liquid is prevented from flowing out of the outer side of the static ring 3 or the moving ring 2.
In the related art, under the working conditions of high pressure and high speed, the constraint force of the magnetic force on the magnetic liquid is limited, and under the working condition of high rotating speed, the radial swing of the rotating shaft easily causes the increase of the radial gap between the magnetic liquid and the rotating shaft, thereby influencing the sealing effect. Under the working condition of high rotating speed, the thickness of an O-shaped ring formed by the magnetic liquid at the pole shoe is thinned, the pressure resistance of the magnetic liquid is reduced, and the sealing effect is poor.
In the embodiment of the invention, the magnetic liquid is restrained between the dynamic pressure groove, the flow channel 33 and the main sealing surface 20 and the main sealing surface 30 of the static ring by using the magnetic force of the permanent magnet 6, and the moving space of the magnetic liquid is limited. The sealing gap is not increased when the rotating shaft 1 swings in the radial direction by adopting the mode that the main sealing surface of the movable ring and the main sealing surface of the static ring are oppositely arranged in the axial direction; the pressure resistance of the magnetic liquid is obviously enhanced by utilizing the hydrodynamic pressure effect, so that the sealing capability is improved; in the working process, the magnetic liquid can keep a stable film shape, and can play a role in lubricating while improving the sealing capability. In addition, in the process of the magnetic liquid circulating in the flow channel 33, not only can the heat generated between the main seal surface 20 of the moving ring and the main seal surface 30 of the static ring be transferred to other positions of the static ring 3, so that the heat dissipation effect is enhanced, but also impurities between the main seal surface 20 of the moving ring and the main seal surface 30 of the static ring can be removed in the process of the magnetic liquid circulating, so that the service life of the dynamic pressure type self-circulation magnetic liquid sealing device is prolonged.
Therefore, the dynamic pressure type self-circulation magnetic liquid sealing device has the advantages of good sealing effect, long service life and the like.
Alternatively, the stationary ring 3 is made of a magnetically conductive material, and the moving ring 2 and the housing 4 are made of a non-magnetically conductive material.
In some embodiments, the dynamic pressure type self-circulation magnetic liquid sealing device further comprises a first sealing ring 71, the movable ring 2 is provided with a first sealing ring groove, the first sealing ring 71 is arranged in the first sealing ring groove, and the inner circumferential surface of the first sealing ring 71 is in sealing fit with the outer circumferential surface of the rotating shaft 1.
For example, as shown in fig. 1, the inner peripheral surface of the rotating ring 2 is provided with a first seal groove, a first seal ring 71 is provided in the first seal groove, and the rotating ring 2 is in sealing engagement with the rotating shaft 1, thereby preventing the magnetic fluid from leaking to the left end of the rotating shaft 1 along the inner peripheral surface of the rotating ring 2.
In some embodiments, the flow passage 33 includes a first section 331, a second section 332, and a third section 333, each of the first section 331 and the second section 332 extending in an axial direction of the rotation shaft 1, the third section 333 extending in a radial direction of the rotation shaft 1, the first section 331 being disposed inside the second section 332, one end of the third section 333 communicating with one end of the first section 331, the other end of the third section 333 communicating with one end of the second section 332, the other end of the first section 331 defining the first port 3310, and the other end of the second section 332 defining the second port 3320.
For example, as shown in fig. 1, the flow path 33 includes a first section 331, a second section 332, and a third section 333, which are connected in sequence, the first section 331 and the second section 332 extend in the left-right direction, and the third section 333 extends in the inward-outward direction. The second section 332 is disposed outside the first section 331, and the first port 3310 is provided at the left end of the first section 331 and the second port 3320 is provided at the left end of the second section 332.
Since the pressure outside the dynamic pressure groove 2011 is greater than the pressure inside the dynamic pressure groove 2011, the first port 3310 is provided near the inner peripheral surface of the stationary ring 3 and the second port 3320 is provided near the outer peripheral surface of the stationary ring 3 in order to ensure a large pressure difference between the second port 3320 and the first port 3310. The magnetic liquid enters from the second port 3320, flows out from the first port 3310 after sequentially passing through the second section 332, the third section 333 and the first section 331, and starts a new cycle process under the action of pressure difference.
It should be noted that the first port 3310 and the second port 3320 may be radially disposed or radially offset.
In some embodiments, the flow passage 33 is provided in plurality, and the plurality of flow passages 33 are provided at intervals in the circumferential direction of the rotating shaft 1; the dynamic pressure groove 2011 is provided in plural, and the plural dynamic pressure grooves 2011 are provided at intervals in the circumferential direction of the rotating shaft 1. From this, through setting up a plurality of runners 33 and a plurality of dynamic pressure groove 2011 for the whole terminal surface equipartition of quiet ring main seal face 30 is full of magnetic liquid film, is favorable to strengthening lubricated effect.
In some embodiments, the stationary ring 3 is provided with an inner ring groove 31 and an outer ring groove 32, the inner ring groove 31 and the outer ring groove 32 are provided on the stationary ring main seal surface 20 around the rotating shaft 1, the inner ring groove 31 is provided inside the outer ring groove 32, the notch of the inner ring groove 31 communicates with the inner end of the dynamic pressure groove 2011, the first port 3310 of each flow passage 33 is provided on the bottom of the inner ring groove 31, the notch of the outer ring groove 32 can communicate with the outer end of the dynamic pressure groove 2011, and the second port 3320 of each flow passage 33 is provided on the bottom of the outer ring groove 32.
For example, as shown in fig. 4, an inner annular groove 31 and an outer annular groove 32 are provided in the stationary ring 3, the inner annular groove 31 communicates with the first port 3310 of each flow passage 33, and the outer annular groove 32 communicates with the second port 3320 of each flow passage 33. Therefore, the magnetic liquid between the main sealing surface 20 of the movable ring and the main sealing surface 30 of the static ring can be conveniently and quickly introduced into the flow channel 33, and the circulation rate of the magnetic liquid is accelerated.
Alternatively, the inner ring groove 31 is disposed adjacent to the inner peripheral surface of the stationary ring 3, and the outer ring groove 32 is disposed adjacent to the outer peripheral surface of the stationary ring 3. Since the farther the distance between the inner ring groove 31 and the outer ring groove 32 is, the greater the pressure difference therebetween is. Thereby, it is advantageous to further accelerate the circulation rate of the magnetic liquid.
In some embodiments, the dynamic ring main seal surface 20 includes an annular dynamic pressure generating portion 201 and an annular static seal portion 202, the dynamic pressure generating portion 201 is provided inside the static seal portion 202, the dynamic pressure groove 2011 is provided on the dynamic pressure generating portion 201, and the notch of the outer ring groove 32 is provided opposite to the static seal portion 202 in the axial direction of the rotating shaft 1. For example, as shown in fig. 3, the inside of the dynamic ring main seal surface 20 is a dynamic pressure generating portion 201 having a ring shape, and dynamic pressure generating grooves 2011 are provided in the dynamic pressure generating portion 201. The static seal portion 202 is located outside the dynamic pressure generating portion 201.
The static seal 202 is a flat plane. When the dynamic pressure type self-circulation magnetic liquid sealing device does not work (when the stationary ring 3 is at the initial position), the stationary sealing part 202 can seal the outer ring groove 32, so that the magnetic liquid is prevented from flowing out of the second port 3320, and the sealing effect of the dynamic pressure type self-circulation magnetic liquid sealing device is improved.
In some embodiments, the depth of the dynamic pressure grooves 2011 is 2 microns to 20 microns.
The depth of the dynamic pressure groove 2011 refers to the dimension of the dynamic pressure groove perpendicular to the dynamic ring main seal surface 20. For example, the depth of the dynamic pressure grooves 2011 is 2 micrometers, 2 to 10 micrometers, 15 micrometers, 20 micrometers, or the like.
In some embodiments, the dynamic pressure grooves 2011 are spiral grooves.
For example, as shown in fig. 3, the dynamic pressure grooves 2011 are spiral in shape, whereby the dynamic ring 2 with a spiral groove provides a greater pressure when rotating than a linear groove, thereby facilitating the formation of a magnetic liquid film.
Note that the spiral direction of the spiral groove coincides with the rotation direction of the rotation shaft 1.
Alternatively, the dynamic pressure groove 2011 may be a linear groove, or the dynamic pressure groove 2011 may be an goose-shaped groove, a fir-tree-shaped groove, or another bionic groove.
In some embodiments, a casing ring groove 42 is formed in the casing 4, a stationary ring groove 34 is formed in the stationary ring 3, the permanent magnet 6 is sleeved on the bottom of the stationary ring groove 34, a liquid storage cavity 5 is defined among the permanent magnet 6, the stationary ring groove 34 and the casing ring groove 42, the liquid storage cavity 5 forms a part of the second section 332, and the other end of the third section 333 is communicated with the liquid storage cavity 5.
For example, as shown in fig. 1 and 2, a casing ring groove 42 is provided on the inner peripheral surface of the casing 4, a stationary ring groove 34 is provided on the outer peripheral surface of the stationary ring 3, the stationary ring groove 34 faces the casing ring groove 42, and the stationary ring groove 34 communicates with the second segment 332, whereby the stationary ring groove 34, the casing ring groove 42, and the permanent magnets 6 together form the reservoir chamber 5. The reservoir 5 communicates between the second section 332 and the third section 333. Because relative rotation can produce the friction heat between rotating ring 2 and the quiet ring 3, magnetic fluid flows through between driven ring main seal face 20 and the quiet ring main seal face 30 and can takes away partly heat, sets up stock solution chamber 5 in runner 33, and the magnetic fluid that has the heat can stop in stock solution chamber 5 at the circulation in-process to on transmitting the heat to casing 4 or quiet ring 3, and then reach refrigerated effect.
Alternatively, the number of the permanent magnets 6 in which the two poles of the permanent magnet 6 are arranged opposite to each other in the axial direction of the rotating shaft may be plural. For example, the left end of the permanent magnet 6 is an N pole, and the right end of the permanent magnet 6 is an S pole.
In some embodiments, a second sealing ring groove is formed on the housing 4, a second sealing ring 72 is arranged in the second sealing ring groove, and the inner circumferential surface of the second sealing ring 72 is in sealing fit with the outer circumferential surface of the stationary ring 3.
For example, as shown in fig. 1 and 2, a second sealing ring groove is provided at the left end of the housing ring groove 42, and a second sealing ring 72 is provided in the second sealing ring groove, so that the magnetic liquid in the liquid storage chamber 5 can be prevented from leaking, and the sealing effect can be improved.
Optionally, a third sealing ring groove is arranged at the right end of the casing ring groove 42, a third sealing ring 73 is arranged in the third sealing ring groove, and the inner circumferential surface of the third sealing ring 73 is in sealing fit with the outer circumferential surface of the stationary ring 3.
Thus, the leakage of the magnetic liquid in the reservoir chamber 5 can be further prevented by the third seal ring 73, and the sealing effect can be further improved.
In some embodiments, the device further comprises an elastic member 8, a positioning column 9 and a positioning groove.
Elastic component 8 sets up elastic component 8 between casing 4 and stationary ring 3 and is used for providing the elasticity towards rotating ring owner's seal face 20 for stationary ring 3, and reference column 9 sets up on one of casing 4 and stationary ring 3, and the constant head tank setting is on the other of casing 4 and stationary ring 3, and reference column 9 cartridge is in the constant head tank to stationary ring 3 and casing 4 stall cooperation.
For example, as shown in fig. 1 and 2, an elastic member 8 is provided between the housing 4 and the stationary ring 3, and the elastic member 8 is used to provide an elastic force to the stationary ring 3 toward the movable ring main seal surface 20. Therefore, when the dynamic pressure type self-circulation magnetic liquid sealing device is in a working state, namely the static ring 3 is positioned at a working position, the positioning column 9 is inserted into the positioning groove, and the static ring 3 can be prevented from rotating along with the ring. When the dynamic pressure type self-circulation magnetic liquid sealing device is stopped from a working state, the static ring 3 can automatically move leftwards to a state (initial position) that the static ring main sealing surface 30 abuts against the moving ring main sealing surface 20 under the action of the elastic force, and the sealing performance between the static ring main sealing surface 30 and the moving ring main sealing surface 20 is ensured.
In other embodiments, a bellows is disposed between the housing and the stationary ring, one end of the bellows is fixedly connected to the stationary ring, and the other end of the bellows is fixedly connected to the housing. Therefore, the bellows can not only provide elastic force towards the main sealing surface of the movable ring for the static ring, but also prevent the static ring from rotating along with the movable ring.
In some embodiments, the elastic member 8 is a compression spring, the housing 4 has a housing abutting surface 41, the stationary ring 3 has a stationary ring abutting surface, the housing abutting surface 41 is disposed opposite to the stationary ring abutting surface in the axial direction of the rotating shaft 1, one end of the compression spring abuts against the housing abutting surface 41, and the other end of the compression spring abuts against the stationary ring abutting surface.
For example, as shown in fig. 1, the housing abutting surface 41 and the stationary ring abutting surface are arranged oppositely in the left-right direction, and the pressing spring is provided between the housing abutting surface 41 and the stationary ring abutting surface.
In some embodiments, the stationary ring 3 has a compression spring groove with a notch facing the housing abutting surface 41, and the groove bottom of the compression spring groove forms the stationary ring abutting surface.
For example, as shown in fig. 1 and 2, the stationary ring 3 is provided with an annular pressure spring groove for fixing the pressure spring and preventing the pressure spring from moving, and a groove bottom surface of the pressure spring groove is a stationary ring abutting surface.
It will be appreciated that in other embodiments, the compression spring slot may be provided on the housing 4.
The dynamic pressure type self-circulation magnetic liquid sealing device has the advantages of novel structure, simple structure, high reliability and the like; the pressure resistance of the magnetic liquid seal is greatly improved by utilizing the hydrodynamic pressure effect; the sealing device has excellent sealing performance in working and static states, and is suitable for working conditions of high speed, high pressure and extremely high requirement on leakage rate. And the dynamic pressure type self-circulation magnetic liquid sealing device of the embodiment has self-circulation capability, so that the heat dissipation effect can be enhanced, the sealing surface can be cleaned, and the service life of the magnetic liquid seal is prolonged.
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 explicitly specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., 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 invention. 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 self-circulating magnetic fluid seal apparatus, comprising:
a housing defining a chamber;
a shaft, a portion of the shaft being rotatably disposed within the chamber;
the static ring is sleeved on the rotating shaft, the static ring is movably arranged in the cavity between an initial position and a working position, the static ring is arranged at a distance from the rotating shaft in the radial direction of the rotating shaft, the static ring is provided with a static ring main sealing surface, a flow passage is arranged on the static ring or a flow passage is limited between the static ring and the shell, the flow passage is provided with a first port and a second port, and the first port is arranged on the inner side of the second port;
the movable ring is sleeved on the rotating shaft and is connected with the rotating shaft in a sealing manner, the movable ring is provided with a movable ring main sealing surface, the static ring main sealing surface and the movable ring main sealing surface are oppositely arranged along the axial direction of the rotating shaft, a dynamic pressure groove is arranged on the movable ring main sealing surface, the first port is communicated with the dynamic pressure groove, the second port can be communicated with the dynamic pressure groove, each of the flow channel and the dynamic pressure groove is filled with magnetic liquid, the static ring main sealing surface of the static ring at the initial position abuts against the movable ring main sealing surface, and the static ring main sealing surface of the static ring at the working position leaves the movable ring main sealing surface; and
the permanent magnet is arranged on the static ring and is positioned in a space defined by the flow channel and the main sealing surface of the static ring.
2. The dynamic pressure type self-circulating magnetic liquid seal device according to claim 1, wherein the flow channel comprises a first section, a second section and a third section, each of the first section and the second section extends in the axial direction of the rotating shaft, the third section extends in the radial direction of the rotating shaft, the first section is disposed inside the second section, an inner end of the third section communicates with one end of the first section, an outer end of the third section communicates with one end of the second section, the other end of the first section defines the first port, and the other end of the second section defines the second port.
3. The dynamic pressure type self-circulating magnetic fluid seal device according to claim 2, wherein a plurality of the flow channels are provided, a plurality of the flow channels are provided at intervals in the circumferential direction of the rotating shaft, a plurality of the dynamic pressure grooves are provided, and a plurality of the dynamic pressure grooves are provided at intervals in the circumferential direction of the rotating shaft.
4. The dynamic pressure type self-circulating magnetic liquid seal device according to claim 3, wherein an inner annular groove and an outer annular groove are provided on the stationary ring, each of the inner annular groove and the outer annular groove is provided on the stationary ring main seal surface around the rotation shaft, the inner annular groove is provided inside the outer annular groove, a notch of the inner annular groove communicates with an inner end of the dynamic pressure groove, the first port of each of the flow passages is provided on a groove bottom of the inner annular groove, a notch of the outer annular groove can communicate with an outer end of the dynamic pressure groove, and the second port of each of the flow passages is provided on a groove bottom of the outer annular groove.
5. The dynamic pressure type self-circulating magnetic liquid seal device according to claim 4, wherein the dynamic ring main seal surface includes an annular dynamic pressure generating portion and an annular static seal portion, the dynamic pressure generating portion being provided inside the static seal portion, the dynamic pressure generating groove being provided on the dynamic pressure generating portion, the notch of the outer annular groove being provided opposite to the static seal portion in the axial direction of the rotating shaft.
6. The dynamic pressure type self-circulating magnetic liquid seal device according to claim 5, wherein the depth of the dynamic pressure groove is 2 to 20 μm.
7. The dynamic pressure type self-circulating magnetic liquid seal device according to any one of claims 2 to 4, wherein a housing ring groove is formed on the housing, a stationary ring groove is formed on the stationary ring, the permanent magnet is sleeved on a groove bottom of the stationary ring groove, a liquid storage cavity is defined among the permanent magnet, the stationary ring groove and the housing ring groove, the liquid storage cavity forms a part of the second section, and the outer end of the third section is communicated with the liquid storage cavity.
8. The dynamic pressure type self-circulating magnetic liquid seal device according to any one of claims 1 to 4, characterized by further comprising:
an elastic member disposed between the housing and the stationary ring, the elastic member being configured to provide an elastic force to the stationary ring toward the movable ring main seal surface;
a positioning post disposed on one of the housing and the stationary ring; and
the positioning groove is formed in the other one of the shell and the static ring, and the positioning column is inserted into the positioning groove so that the static ring is in rotation stop fit with the shell.
9. The dynamic pressure type self-circulation magnetic liquid sealing device according to claim 8, wherein the elastic member is a compression spring, the housing has a housing abutting surface, the stationary ring has a stationary ring abutting surface, the housing abutting surface is disposed opposite to the stationary ring abutting surface in the axial direction of the rotating shaft, one end of the compression spring abuts against the housing abutting surface, and the other end of the compression spring abuts against the stationary ring abutting surface.
10. The dynamic pressure type self-circulating magnetic liquid seal device according to claim 9, wherein the stationary ring has a compression spring groove with a notch facing the housing abutment surface, and a groove bottom of the compression spring groove constitutes the stationary ring abutment surface.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005321002A (en) * 2004-05-07 2005-11-17 Nippon Pillar Packing Co Ltd Sealing device for treating device using rotary table
CN103759018A (en) * 2014-01-17 2014-04-30 北京交通大学 Magnetic liquid sealing device for sealing liquid
CN104948743A (en) * 2015-06-16 2015-09-30 北京交通大学 Novel multi-stage magnetic liquid sealing device
CN105351528A (en) * 2015-11-06 2016-02-24 北京交通大学 Magnetic liquid magnetic sealing device suitable for high rotating speed condition
CN110185653A (en) * 2019-07-07 2019-08-30 南京林业大学 A kind of combined contactless double seals based on magnetic fluid sealing Yu hydrodynamic mechanical seal
CN112963543A (en) * 2021-03-23 2021-06-15 南京林业大学 Diffusion type self-pumping fluid dynamic and static pressure type mechanical seal

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005321002A (en) * 2004-05-07 2005-11-17 Nippon Pillar Packing Co Ltd Sealing device for treating device using rotary table
CN103759018A (en) * 2014-01-17 2014-04-30 北京交通大学 Magnetic liquid sealing device for sealing liquid
CN104948743A (en) * 2015-06-16 2015-09-30 北京交通大学 Novel multi-stage magnetic liquid sealing device
CN105351528A (en) * 2015-11-06 2016-02-24 北京交通大学 Magnetic liquid magnetic sealing device suitable for high rotating speed condition
CN110185653A (en) * 2019-07-07 2019-08-30 南京林业大学 A kind of combined contactless double seals based on magnetic fluid sealing Yu hydrodynamic mechanical seal
CN112963543A (en) * 2021-03-23 2021-06-15 南京林业大学 Diffusion type self-pumping fluid dynamic and static pressure type mechanical seal

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