CN106907485B - A kind of pressure adaptive lip shape seal device - Google Patents
A kind of pressure adaptive lip shape seal device Download PDFInfo
- Publication number
- CN106907485B CN106907485B CN201710294954.1A CN201710294954A CN106907485B CN 106907485 B CN106907485 B CN 106907485B CN 201710294954 A CN201710294954 A CN 201710294954A CN 106907485 B CN106907485 B CN 106907485B
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- China
- Prior art keywords
- lip
- chamber
- mounting base
- cavity
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- 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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
-
- 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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
A kind of pressure adaptive lip shape seal device, lip seal mounting base and are equipped with groove；Lip is sealed circumferentially arranged with several regulators in mounting base, and the inner end of the cavity of regulator is connected in the first axis hole that lip seals in mounting base with the second axial hole that lip seals on back by being arranged, and the second axial hole is connected to dielectric cavity；The opening of cavity outer end is furnished with sealing cover；The piston that can be slid axially is equipped in cavity, piston is by cavity airtight partition at first chamber and second chamber；Piston rod is equipped in first chamber, the outer end bias of piston rod is fixed on the inner face of piston, and the inner end of piston rod is airtight in an axial direction to be sealed back through lip envelope mounting base and lip and extend in dielectric cavity, and is fixed on lip envelope back；Adjustment portion is equipped in second chamber.The present invention can adaptively regulate and control the radial load of seal lip according to the variation of sealed pressure, at the same can also by extraneous pressure-regulating valve to regulate and control in real time to seal lip radial load.
Description
Technical field
The present invention relates to a kind of pressure adaptive lip shape seal devices.
Background technology
Rotating shaft lip-shaped sealing is due to the advantages such as its is simple in structure, sealed reliable in engineering machinery and transportation machinery etc.
It is used widely in equipment.The basic structure of lip packing generally comprises rubber lip body, metallic framework and garter spring etc. three
Part is sealed the medium in mechanical equipment by the interference fit of flexible sealing lip and axis.Lip radial load pair
Leakproofness is sealed in lip and service life is crucial, and if radial load is excessive, then excessive wear is easily caused, and if radial load mistake
It is small, then it is easy to cause dielectric leakage because poorly sealed.
Lip packing lip radial load is generally by Spring Card clamp force, pressure medium and because of lip and the generation of axis elastic conjunction
The three parts such as enclasping force form, since lip packing main body is generally rubber elastic material, when sealed pressure is larger, to lip
The radial load of shape seal lip increases, and easily causes the moderate finite deformation of seal lip and fails.
In the prior art generally by the rational design of lip packing cross sectional shape, or shorten lip packing waist and
Increase its thickness to adapt to the lip seal configuration compared with high sealing pressure operating mode, but in above-mentioned technology once shaping, then can not
Adaptively regulate and control lip radial load according to the variation of sealed pressure, causes lip packing many pressure are higher or pressure changeable work
The application of condition occasion is limited.
Invention content
In order to overcome existing lip packing can not according to sealed pressure adjust automatically lip radial load, cause it higher
The limited deficiency of the use of pressure occasion, the present invention propose it is a kind of it is simple in structure, lip can be automatically adjusted according to sealed pressure
The pressure adaptive lip shape seal device of radial load.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of pressure adaptive lip shape seal device, including shell further include the lip being arranged between shell and shaft
Sealing ring and lip seal mounting base, and lip-type packing and lip envelope mounting base coaxial arrangement；The lip-type packing includes separate turns
The inner ring of the outer ring of axis and close shaft；The outer ring is fixed on lip by lip sealed cover and seals in mounting base, is set on the inner ring
There is the seal lip of the sliding contact on complete cycle of the outer surface with shaft, and seal lip is tightly attached to by urgent power given unit
On shaft outer surface；Cavity between shell and shaft is separated into dielectric cavity and big by lip-type packing and lip sealed cover in an axial direction
Air cavity；
Lip-type packing further includes being used to support lip envelope back and setting of the seal lip at sliding contact position outside
Metallic framework in circle, and inner ring and outer ring seals back by lip and is connected；
The central shaft direction for defining shaft is axial, and the diametric(al) of shaft is radial, and the circumferencial direction of shaft is
It is circumferential；And definition is inner end close to one end of dielectric cavity, is outer end close to one end of atmosphere chamber；
The lip envelope mounting base is equipped with receiving lip envelope back and deforms shifting in labiad envelope mounting base under pressure medium effect
Dynamic groove, and lip envelope back is arranged close to the notch of the groove；
Circumferentially arranged with several regulators, the regulator include axially extending in lip envelope mounting base
The first axis hole in mounting base and the second axial hole company on lip envelope back are sealed in the inner end of cavity, cavity by being arranged in lip
It is logical, and the second axial hole is connected to dielectric cavity；The opening of cavity outer end is furnished with sealing cover；
The piston that can be slid axially is equipped in cavity, piston is tightly connected with cavity, and cavity is separated into and leans on by piston
The first chamber at nearly lip envelope back and the second chamber close to sealing cover；Piston rod is equipped in the first chamber, piston rod
Outer end bias is fixed on the inner face of piston, and the inner end of piston rod is airtight in an axial direction to seal back simultaneously through lip envelope mounting base and lip
It extends in dielectric cavity, and the inner end of piston rod is fixed on lip envelope back；Piston and sealing cover are by cavity enclosure at the second chamber
Room, second chamber is interior to be equipped with the adjustment portion that oppressive force is provided to piston lateral surface.
Further, the adjustment portion includes the sealing cover, adjustment spring and several pieces of adjusting gaskets, and sealing cover, which has, to be prolonged
The interior section of prolonging extended in second chamber is located at the plug outside being open with stifled；Prolong section in described and is slidably disposed on second chamber
It is interior, and connected by adjustment spring between the interior inner face for prolonging section and the outer end face of piston；Lip seals mounting base and is equipped with for pacifying
The groove of plug is filled, plug is detachably connected by screw bolt and nut, and the adjusting gasket is equipped between plug and groove
Installation position, to change the decrement of adjustment spring by changing quantity and the thickness of adjusting gasket.
Alternatively, second chamber is airtight, the adjustment portion includes the compressed gas source with second chamber air tight communication.
Further, is provided with air admission hole in lip envelope mounting base, outlet and the air admission hole air tight communication of tracheae, tracheae into
Mouth is connected to compressed gas source, and tracheae is equipped with pressure-regulating valve.
Further, the inner end of the piston rod is tightened in lip by nut and annular gasket and seals on back.
Further, the urgent power given unit is garter spring.
Further, several described regulators are uniformly distributed circumferentially.
The operation principle of the present invention：
Lip packing is generally used for the case where zero pressure difference or small pressure difference, it is difficult to the sealing occasion of larger pressure difference is adapted to,
Reason is that larger sealed pressure is easy to cause elastic packing lip and excessive deformation occurs, to aggravate to cause the mill of seal lip
Damage.
The present invention propose it is a kind of can according to the variation of sealed pressure and the novel lip of automatic adjusument lip radial load is close
Seal structure, to make it can be used for the sealing occasion of elevated pressures.The radial load of lip packing mainly includes the bullet of garter spring
Spring clamping force Fsp1, pressure medium Fp1With the enclasping force F generated by lip and shaft elastic conjunctiont1, the present invention is directed to pass through
Reduce enclasping force Ft1, with counteracting or partial offset, the radial load because caused by increasing pressure medium increases.
The atmospheric side that mounting base is sealed in lip (defines the axial direction along shaft, is side medium, i.e. Fig. 2 close to the side of dielectric cavity
Or left side shown in fig. 5；It is atmospheric side, the i.e. right sides Fig. 2 or shown in fig. 5 close to the side of atmosphere chamber) processing cavity, and in sky
Piston, adjustment spring and sealing cover are sequentially arranged in chamber, the first through hole and lip that first chamber is sealed by lip in mounting base are sealed
Second through-hole at back is connected to seal cavity (dielectric cavity)；It is sealed between back and lip envelope mounting base in lip and is equipped with groove, for
Lip envelope back deforms into it.
To piston force analysis it is found that the active force (i.e. to medium cavity direction) predominantly acts on its inner face to the right
Pressure medium Fp, and the active force (i.e. to air cavity direction) includes then the spring force F for acting on its outer end face to the leftsp, and
The restoring force F of annular gasket is acted on after the back deformation of lip envelopet2。
When the sealed medium pressure in dielectric cavity increases, the pressure medium in first chamber also increases therewith, lives at this time
Plug is pressed on the directed force F on lip envelope back by adjusting nut on offset piston bar and annular gaskett3Also increase therewith,
Under the action of the power, lip envelope back can occur slightly to deform, and the groove in lip envelope mounting base is exactly to allow this little to become
Shape and be arranged.Lip seals back and is contacted with lip envelope mounting base close to inner radius, which is equivalent to fulcrum；It is being pressed in the lip envelope back of the body
The directed force F in portiont3Under the action of, it will produce at lip packing lip and enclasping force Ft1The opposite screen resilience F in directiont4, so as to
The medium directed force F because caused by increasing sealed pressure is offset to a certain extentp1Increase.Meanwhile by sealing cover with
Adjusting gasket is added between lip envelope mounting base, amount of spring compression can be regulated and controled by the quantity and thickness of adjusting gasket, and then adjust
Section acts on the spring force on piston outer end face, final to realize to lip packing screen resilience Ft4Regulation and control.
Alternatively, adding sealing ring between sealing cover and second chamber, it is ensured that second chamber it is airtight, in piston and
Closed second chamber is constructed between sealing cover, is connected to by tracheae with extraneous compressed gas source by air inlet, and in tracheae
Upper installation pressure-regulating valve can realize the adjusting to gas pressure in second chamber by the aperture of control pressure regulating valve, into
And change the active force for acting on piston outer end face, the final online regulation and control realized to lip packing radial load.
Patent of the present invention provides a kind of pressure adaptive lip shape seal device, and compared with prior art, advantage exists
In：
(1) piston is added by sealing back in lip, it, can be by the way that " sealing is situated between when seal chamber (dielectric cavity) pressure change
Medium active force variation → annular gasket of matter pressure change → act on piston acts on lip envelope back pressing force variation → lip
The force transmission path of mouth enclasping force variation → lip balanced radial force ", is realized in different sealing pressure condition lower lip bore
To the balance of power, excessive lip radial load is avoided, extends lip packing service life.
(2) it by the way that second chamber is arranged to closed cavity, and is connected to extraneous compressed gas source by air inlet, by pressing
Force regulating valve controls the pressure medium of second chamber, it can be achieved that online real-time monitoring to lip packing lip radial load, makes
Its applicable pressure limit is wider.
Description of the drawings
Fig. 1 is the overall structure sectional view of the present invention；
Fig. 2 be lip-type packing in embodiment 1, lip envelope mounting base and lip sealed cover sectional view；
Fig. 3 is the force analysis figure of lip-type packing；
Fig. 4 is the structure and force analysis figure of piston；
Fig. 5 be lip-type packing in embodiment 2, lip envelope mounting base and lip sealed cover sectional view；
Specific implementation mode
Embodiment 1
With reference to attached drawing 1-4, a kind of pressure adaptive lip shape seal device, including shell further include setting in shell and turn
Mounting base 2 is sealed in lip-type packing 6 and lip between axis, and lip-type packing 6 and lip envelope mounting base 2 are coaxially disposed；The lip
Sealing ring 6 includes the outer ring 63 far from shaft and the inner ring close to shaft；The outer ring 63 is fixed on lip envelope by lip sealed cover 1
In mounting base 2, the inner ring is equipped with the seal lip 61 with outer surface sliding contact on complete cycle of shaft, and seal lip
61 are tightly attached to by urgent power given unit 62 on shaft outer surface；Lip-type packing 6 and lip sealed cover 1 by shell and shaft it
Between cavity be separated into dielectric cavity 72 and atmosphere chamber 71 in an axial direction；
Lip-type packing 6 further includes the lip envelope back 65 and setting for being used to support seal lip 61 at sliding contact position
Metallic framework in outer ring, and inner ring and outer ring 63 seals back 65 by lip and is connected；
The central shaft direction for defining shaft is axial, and the diametric(al) of shaft is radial, and the circumferencial direction of shaft is
It is circumferential；And definition is inner end close to one end of dielectric cavity, is outer end close to one end of atmosphere chamber 71；
The lip envelope mounting base 2 is equipped with the change in labiad envelope mounting base 2 under pressure medium effect of receiving lip envelope back 65
The groove 23 of shape movement, and lip envelope back 65 is arranged close to the notch of the groove 23, the rotation angle position 66 that lip seals back 65 pastes
The lip envelope mounting base 2.
Circumferentially arranged with several regulators in the lip envelope mounting base 2, the regulator includes axially extending
Cavity, the second axis that the first axis hole 22 in mounting base 2 is sealed with lip on back 65 is sealed in the inner end of cavity by being arranged in lip
It is connected to hole 601, and the second axial hole 601 is connected to dielectric cavity 72；The opening of cavity outer end is furnished with sealing cover 3；
The piston 5 that can be slid axially is equipped in cavity, piston 5 is tightly connected with cavity, and cavity is separated by piston 5
Close to the first chamber at lip envelope back 65 and close to the second chamber 21 of sealing cover；Piston rod 502 is equipped in the first chamber,
The outer end bias of piston rod 502 is fixed on the inner face of piston 5, and the inner end of piston rod 502 is airtight in an axial direction through lip envelope peace
Dress seat 2 and lip envelope back 65 simultaneously extend in dielectric cavity 72, and the inner end of piston rod is fixed on lip envelope back 65；5 He of piston
For sealing cover 3 by cavity enclosure at second chamber 21, second chamber 21 is interior to be equipped with the adjusting that oppressive force is provided to 5 lateral surface of piston
Portion.
The adjustment portion includes the sealing cover 3, adjustment spring 4 and several pieces of adjusting gaskets 32, and sealing cover 3, which has, to be prolonged
The interior section of prolonging extended in second chamber 21 is located at the plug outside being open with stifled；Prolong section in described and is slidably disposed on second chamber
In 21, and connected by adjustment spring 4 between the interior inner face for prolonging section and the outer end face of piston 5；Lip envelope mounting base 2 is equipped with
For the groove of installed plug, plug is detachably connected by bolt 31 and nut, and the tune is equipped between plug and groove
The installation position for saving gasket 32, to change the decrement of adjustment spring 4 by changing quantity and the thickness of adjusting gasket 32.Pass through
The quantity and thickness of adjusting gasket 32 prolong extension depth of the section in second chamber 21 in can controlling, to controllable spring 4
Elastic force.
The inner end 501 of piston rod 502 is equipped with screw thread, and the inner end 501 of the piston rod 502 passes through nut 51 and annular
Gasket 52 is tightened on lip envelope back 65.
The urgent power given unit 62 is garter spring.
It is equipped with the first sealing ring 53 between piston rod and lip envelope mounting base 2, the second sealing ring is equipped between piston and inner cavity
54。
It is fixedly connected by trip bolt 11 between lip sealed cover 1 and lip envelope mounting base 2.
Piston 5 includes columned piston only 503.
Embodiment 2
Refer to the attached drawing 1-5.
The present embodiment is difference from example 1 is that adjustment portion is different.
Prolong in sealing cover 3 and be equipped with third sealing ring 33 between section and second chamber, second chamber 21 is airtight, the adjusting
Portion includes the compressed gas source with 21 air tight communication of second chamber.
Air admission hole 24, outlet and 24 air tight communication of air admission hole of tracheae 82, tracheae 82 are provided in the lip envelope mounting base 2
Import be connected to compressed gas source, and tracheae 82 be equipped with pressure-regulating valve 81.
Other embodiments of the present embodiment are same as Example 1.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention
Range is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention is also and in art technology
Personnel according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (7)
- Further include that the lip that is arranged between shell and shaft is close 1. a kind of pressure adaptive lip shape seal device, including shell Seal and lip seal mounting base, and lip-type packing and lip envelope mounting base coaxial arrangement；The lip-type packing includes far from shaft Outer ring and close to shaft inner ring；The outer ring is fixed on lip by lip sealed cover and seals in mounting base, and the inner ring is equipped with With the seal lip of outer surface sliding contact on complete cycle of shaft, and seal lip by urgent power given unit be tightly attached to turn On axis outer surface；Cavity between shell and shaft is separated into dielectric cavity and air by lip-type packing and lip sealed cover in an axial direction Chamber；Lip-type packing further includes being used to support lip envelope back and setting of the seal lip at sliding contact position in outer ring Metallic framework, and inner ring and outer ring by lip seal back be connected；It is characterized in that：The central shaft direction for defining shaft is axial, and the diametric(al) of shaft is radial, and the circumferencial direction of shaft is circumferential； And definition is inner end close to one end of dielectric cavity, is outer end close to one end of atmosphere chamber；The lip seals mounting base and seals displacement in mounting base equipped with lip envelope back labiad under pressure medium effect is accommodated Groove, and lip envelope back is arranged close to the notch of the groove；Circumferentially arranged with several regulators in the lip envelope mounting base, the regulator includes the sky axially extended The inner end of chamber, cavity is connected in the first axis hole that lip seals in mounting base with the second axial hole that lip seals on back by being arranged, And second axial hole be connected to dielectric cavity；The opening of cavity outer end is furnished with sealing cover；The piston that can be slid axially is equipped in cavity, piston is tightly connected with cavity, and cavity is separated into close to lip by piston Seal the first chamber at back and the second chamber close to sealing cover；Piston rod, the outer end of piston rod are equipped in the first chamber Bias is fixed on the inner face of piston, and the inner end of piston rod is airtight in an axial direction to be sealed back through lip envelope mounting base and lip and extend To dielectric cavity, and the inner end of piston rod is fixed on lip envelope back；It is equipped with to piston lateral surface in second chamber and compressing is provided The adjustment portion of power.
- 2. a kind of pressure adaptive lip shape seal device as described in claim 1, it is characterised in that：The adjustment portion includes institute Sealing cover, adjustment spring and several pieces of adjusting gaskets are stated, there is sealing cover the interior section of prolonging extended in second chamber to be located at stifled Plug outside opening；Prolong section in described to be slidably disposed in second chamber, and the outer end of the interior inner face and piston for prolonging section It is connected by adjustment spring between face；Lip seals mounting base and is equipped with the groove for being used for installed plug, and plug passes through screw bolt and nut It is detachably connected, and is equipped with the installation position of the adjusting gasket between plug and groove, to pass through the quantity for changing adjusting gasket Change the decrement of adjustment spring with thickness.
- 3. a kind of pressure adaptive lip shape seal device as described in claim 1, it is characterised in that：Second chamber is airtight, institute It includes the compressed gas source with second chamber air tight communication to state adjustment portion.
- 4. a kind of pressure adaptive lip shape seal device as claimed in claim 3, it is characterised in that：In the lip envelope mounting base It is provided with air admission hole, outlet and the air admission hole air tight communication of tracheae, the import of tracheae is connected to compressed gas source, and tracheae is equipped with Pressure-regulating valve.
- 5. such as a kind of pressure adaptive lip shape seal device of claim 2-4 any one of them, it is characterised in that：The piston The inner end of bar is tightened in lip by nut and annular gasket and seals on back.
- 6. a kind of pressure adaptive lip shape seal device as claimed in claim 5, it is characterised in that：The urgent power assigns single Member is garter spring.
- 7. a kind of pressure adaptive lip shape seal device as claimed in claim 6, it is characterised in that：Several described pressure regulation dresses It sets and is uniformly distributed circumferentially.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710294954.1A CN106907485B (en) | 2017-04-28 | 2017-04-28 | A kind of pressure adaptive lip shape seal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710294954.1A CN106907485B (en) | 2017-04-28 | 2017-04-28 | A kind of pressure adaptive lip shape seal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106907485A CN106907485A (en) | 2017-06-30 |
| CN106907485B true CN106907485B (en) | 2018-11-09 |
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| CN201710294954.1A Expired - Fee Related CN106907485B (en) | 2017-04-28 | 2017-04-28 | A kind of pressure adaptive lip shape seal device |
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| CN (1) | CN106907485B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504186B (en) * | 2017-08-22 | 2019-02-01 | 浙江工业大学 | A kind of adaptive transformation operating mode type assembly type rubber sealing structure |
| CN107366747B (en) * | 2017-08-22 | 2019-02-01 | 浙江工业大学 | A kind of adjustable rubber-moulding sealing structure of compression ratio |
| CN109973657B (en) * | 2018-01-03 | 2024-05-31 | 双龙集团有限公司 | Lip type mechanical sealing device |
| CN108223795A (en) * | 2018-02-08 | 2018-06-29 | 深圳垦拓流体控制有限公司 | A kind of sealing element mounting structure, dynamic iron construction and solenoid valve |
| CN112212008B (en) * | 2020-09-03 | 2022-07-15 | 广州机械科学研究院有限公司 | Pressure self-adaptive rotary sealing device |
| CN112963541A (en) * | 2021-02-07 | 2021-06-15 | 青岛众力诚达智能科技有限公司 | Rotary sealing structure with thread pair |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206958251U (en) * | 2017-04-28 | 2018-02-02 | 嘉兴学院 | A kind of pressure adaptive lip shape seal device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55120859U (en) * | 1979-02-21 | 1980-08-27 | ||
| CN2397314Y (en) * | 1999-11-30 | 2000-09-20 | 曹伟龙 | Sealing ring for liquid cleaning device |
| DE10113869A1 (en) * | 2001-03-21 | 2002-09-26 | Sms Demag Ag | Sealing system for bearing for roller comprises sealing rings which fit against surface on roller shaft, rings and surface being mounted on supports which are less rigid than sealing lips on rings |
| AT503578B1 (en) * | 2006-04-28 | 2007-11-15 | Andritz Ag Maschf | SEALING ARRANGEMENT |
| US8684362B2 (en) * | 2009-08-12 | 2014-04-01 | Bal Seal Engineering, Inc. | Cartridge seal assemblies and associated methods |
| US8985589B1 (en) * | 2013-09-30 | 2015-03-24 | Aktiebolaget Skf | Seal assembly with adjustable outside diameter |
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2017
- 2017-04-28 CN CN201710294954.1A patent/CN106907485B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206958251U (en) * | 2017-04-28 | 2018-02-02 | 嘉兴学院 | A kind of pressure adaptive lip shape seal device |
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Granted publication date: 20181109 Termination date: 20210428 |