CN107218395B - Ternary distorts type groove end surface mechanical sealing structure - Google Patents
Ternary distorts type groove end surface mechanical sealing structure Download PDFInfo
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- CN107218395B CN107218395B CN201710545326.6A CN201710545326A CN107218395B CN 107218395 B CN107218395 B CN 107218395B CN 201710545326 A CN201710545326 A CN 201710545326A CN 107218395 B CN107218395 B CN 107218395B
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- 238000007789 sealing Methods 0.000 title claims abstract description 57
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 31
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010146 3D printing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003486 chemical etching Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010330 laser marking Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
A kind of ternary distortion type groove end surface mechanical sealing structure, rotating ring including mechanical seal and stationary ring, circumferentially equally distributed ternary distortion type groove 1 is machined in the rotating ring and stationary ring on the seal face of at least one sealing ring, the ternary distortion type groove is made of two side and the three-dimensional twisted groove bottom that deepens, the side wall of ternary distortion type groove includes windward side ternary distortion wall surface 11 and leeward side ternary distortion wall surface 13, the three-dimensional twisted 12 pressure sealing ring outer peripheral sidewall of groove bottom that deepens gradually shoals in distorted shape to sealing ring center, and intersect with seal face in 3 outside of seals dam；Ternary distorts the side wall of type groove 1 and the intersecting lens of sealing ring outer peripheral sidewall perpendicular to seal face；The side wall of ternary distortion type groove 1 and the intersecting lens of seal face are divided into two sections, and medium inlet side intersecting lens is helix, and dielectric leakage side intersecting lens is radial alignment.
Description
Technical field
The present invention relates to a kind of shaft end mechanical end face sealing structure of rotary type fluid machine, more particularly to a kind of type groove
Wall surface is that the ternary of ternary warp surface distorts type groove mechanical end face sealing structure, for rotations such as various compressors, pump and reaction kettles
The rotation axis seal of favourable turn tool.
Background technology
Seal face opens up the gas lubrication for waiting deep spiral grooves structure or hydrodynamic lubrication non-contact mechanical seal in stone
It obtains on the industries high speed rotating machineries (such as centrifugal compressor, express pump) such as oil, petrochemical industry and electric power and widely answers
With.When rotating ring rotates, fluid media (medium) is pumped into seal face using the dynamic and static pressure effect of type groove, into the fluid of seal face
Medium generates certain opening force and pushes end face open in type groove root constricted flow and pressure rise, to make between dynamic and static ring
There is one layer of micron-sized fluid film and realizes non-contact operation.But the non-contact mechanical seal of existing equal deep spiral grooves structure
Not big enough using process medium fluid film rigidity in high-speed rotating machine, sealing leak is more serious, and failure accidents is caused to take place frequently.
Chinese patent CN1415877A, CN101644333A, United States Patent (USP) US5441283 etc. can improve sealing to a certain extent
Fluid film rigidity reduces sealing leak, especially double helix angle three-dimensional spiral slot end face seal structure, with it is common equal deep, etc. spiral shells
The two-dimensional helical slot end face seal of swing angle is compared, under the same conditions its fluid film thickness or more rigid, reliability higher.
The previous type groove side wall using the processed face type slot of the methods of laser marking, chemical etching, plating all with sealing
End face near vertical, it is difficult to which the shape of control type trough wall surface, this limits the raising of end face type groove performance to a certain extent.Closely
Nian Lai, 3D printing technique are risen, and the especially development of micro/nano-scale superhigh precision 3D printing technique, 3D printing technique is real at present
The lines of existing metal material accomplish 120nm, or even have some materials that can accomplish 30~40nm, surface roughness can be controlled in 4~
10nm, this face type groove processing for making it possible complicated water runner and distorting wall surface.
Invention content
In order to improve the depths such as existing or deepen exemplary helical groove mechanical end face seal stream existing under the conditions of high speed
The deficiencies of body film rigidity is not big enough, and sealing leak amount is larger, the present invention provide that a kind of end face dynamic pressure effect is good, fluid film rigidity
Greatly, leakage rate is small, and the ternary for being suitable for high speed operating condition distorts type groove mechanical end face sealing structure.
The technical scheme is that：
A kind of ternary distorts type groove end surface mechanical sealing structure, includes the rotating ring and stationary ring of mechanical seal, the rotating ring and
Circumferentially equally distributed ternary distortion type groove 1, the ternary are machined in stationary ring on the seal face of at least one sealing ring
Distortion type groove is made of two side and the three-dimensional twisted groove bottom that deepens, and the side wall of ternary distortion type groove includes the distortion of windward side ternary
Wall surface 11 and leeward side ternary distort wall surface 13, and the three-dimensional twisted 12 pressure sealing ring outer peripheral sidewall of groove bottom that deepens is to sealing ring center
It gradually shoals in distorted shape, and intersects with seal face in 3 outside of seals dam；Ternary distorts outside the side wall and sealing ring of type groove 1
The intersecting lens 111 of all side walls and 131 is perpendicular to seal face；Ternary distorts the side wall of type groove 1 and the intersecting lens point of seal face
It it is two sections, medium inlet side intersecting lens 113 and 133 is helix, and dielectric leakage side intersecting lens 114 and 134 is radial alignment.
Leeward side ternary distorts wall surface 13 and throwing of the three-dimensional twisted intersecting lens 132 for deepening groove bottom 12 on seal face
Hachure and windward side ternary distortion wall surface 11 and throwing of the three-dimensional twisted intersecting lens 112 for deepening trough wall surface 12 on seal face
Hachure is all helix；
It is equipped with the sealing weir that do not slot between the two neighboring ternary distortion type groove circumferential direction, the ternary distortion type groove is let out
Leakage side is machined with seals dam, plays the role of stop seal.
Preferably, ternary distortion type groove 1 side wall and seal face intersecting lens in medium inlet side intersecting lens 113 and
133, leeward side ternary distortion wall surface 13 and the three-dimensional intersecting lens 132 for deepening groove bottom 12, leeward side ternary distortion wall surface 13 with
Intersecting lens 133, windward side ternary distortion wall surface 11 and the three-dimensional intersecting lens for deepening trough wall surface 12 of seal face medium inlet side
112, the projection line of windward side ternary distortion wall surface 11 and the intersecting lens 113 of seal face leakage hole side on seal face is all
Log spiral.
Further, the ternary distorts type groove in outer diameter roThe circular arc angle theta at placegWith corresponding sealing weir at same Radius
Circular arc angle thetalThe ratio between θg/θlPreferred value ranging from θg/θl=0.5~2.0；The radially slotted width of the ternary distortion type groove
Spend (ro-rg) and seal face width (ro-ri) the ratio between (ro-rg)/(ro-ri) preferred value ranging from 0.45~0.85；Described three
Member distortion wall surface is located at the intersecting lens radial width (r of entrance side with seal faceo-rh) and ternary distortion type groove radial width
(ro-rg) the ratio between (ro-rh)/(ro-rg) value range be 0.5~1.0；The groove depth of the ternary distortion type groove is 0~20 μm,
Entrance side depth is 5~20 μm, and leakage side channel depth is 0~5 μm；Wherein, when sealing medium is gas, the ternary distorts type groove
Groove depth be 0~12 μm, entrance side depth be 5~12 μm, leakage side channel depth be 0~2 μm；It is described when sealing medium is liquid
The groove depth that ternary distorts type groove is 0~20 μm, and entrance side depth is 10~20 μm, and leakage side channel depth is 0~5 μm.
Fluid medium of the present invention has stronger compression and water conservancy diversion effect, and slip is low, has under high-speed condition
There are excellent operation stability and leakproofness, it is strong to resist external disturbance ability.
The present invention operation principle be：
Using micro/nano-scale superhigh precision 3D printing technique or superfine grinding or Precision EDM processing technology, in machinery
Ternary distortion type groove is processed on the rotating ring of sealing or stationary ring end face.When mechanical seal operates, the fluid on the outside of sealing ring is situated between
Matter is pumped in ternary distortion type groove, and by medium inlet side or the flowing of sucking lateral leakage side, wall surface is distorted in windward side ternary
Under the structure guide functions for distorting wall surface with leeward side ternary, a fluid media (medium) part circumferentially flows, and another part is radially
Flowing, and since the variation of groove depth leads to the progressive compression of fluid generation radially.Due to the seals dam that do not slotted
Sealing ring end face squeezing action with the throttling action of sealing weir and with the cooperation of fluting face, the fluid media (medium) into sealing surface obtain
To compression, pressure medium increases rapidly in slot root, and under pressure effect, dynamic and static ring end face is open and forms one layer of stabilization
Fluid film, to realize the non-contact operation in end face.During fluid media (medium) is downstream flowed from upstream side, due to three
The grooved section of member distortion type groove is gradually reduced, and the compression enhancing of fluid medium can form bigger under high-speed condition
Opening force and more stable fluid film.Side is leaked in ternary distortion type groove, a part of fluid media (medium) is across three-dimensional groove with variable depth bottom
It is radially flowed after the intersecting lens of face and seal face, this segment fluid flow is further downstream flowed in Ba Qu, to cause
The leakage of fluid media (medium)；And since leeward side and windward side ternary distort the structure guide functions of wall surface, have and greatly flows
For body medium along sealing ring end face circumferential flow, this segment fluid flow both ensure that seal face with the presence of enough lubricant mediums,
It ensure that the good lubricating status of seal face, while also avoiding a large amount of leakages of the fluid media (medium) to internal side diameter, Ye Jiti
High leakproofness.
The advantages of the present invention are：
(1) groove bottom deepens convergence structure for typical three-dimensional in ternary distortion type groove, namely from end face upstream to downstream
The cross section of fluid channel of side, type groove becomes narrow gradually, and waits depth type groove, fluid medium that there is stronger pump to draw and compress work compared to common
With；The side wall that ternary distorts type groove is ternary distorted-structure, and from end face upstream to downstream, side runner gradually narrows, and is further strengthened
The compression of type groove fluid medium.This powerful pump that type groove fluid medium generates is drawn and compression so that its
There is better hydrodynamic effect under the conditions of high speed, there is stronger fluid film rigidity under the conditions of identical film thickness and hold
Loading capability, two seal faces touch mill when to avoid high-speed cruising, can farthest prolonged mechanical sealing use the longevity
Life.
(2) trough wall surface is typical ternary distorted-structure in ternary distortion type groove, in type groove medium inlet side, ternary distortion
For the intersecting lens of type groove and sealing ring-side wall perpendicular to end face, it is close that larger entrance section can guarantee that enough fluid media (medium)s are pumped to
Sealing end face, namely ensure that seal face has enough lubricants；Side, the windward side of distorted shape and leeward are leaked in type groove
The common guide functions of side channel wall surface by the Radial Flow of fluid media (medium) in slot to circumferential guiding, even if also most fluid edge
Sealing ring end face circumferential flow avoids a large amount of leakages of the fluid media (medium) to internal side diameter, improves leakproofness.
Description of the drawings：
Fig. 1 is the fluting end face three dimensional structure diagram of case study on implementation one of the present invention；
Fig. 2 is the fluting end face geometrical structure parameter unified definition schematic diagram of case study on implementation one of the present invention；
Fig. 3 is the ternary distortion type groove cross section structure signal taken along line A-A in attached drawing 2 in case study on implementation one of the present invention
Figure；
Fig. 4 is the structural schematic diagram of ternary distortion type groove in case study on implementation one of the present invention；
Fig. 5 is the fluting end face three dimensional structure diagram of case study on implementation three of the present invention；
Fig. 6 is the fluting end structure illustration of case study on implementation three of the present invention.
Specific implementation mode
The implementation of the present invention is described in further detail in conjunction with attached drawing.
Embodiment one
Referring to Fig. 1,2,3 and 4, a kind of ternary distorts type groove end surface mechanical sealing structure, including the rotating ring of mechanical seal and
Stationary ring is machined with circumferentially equally distributed ternary distortion in the rotating ring and stationary ring on the seal face of at least one sealing ring
Type groove 1, the ternary distortion type groove 1 distorts wall surface 11 by windward side ternary, leeward side ternary distorts wall surface 13 and three-dimensional twisted
Deepen the composition of groove bottom 12；The side wall of ternary distortion type groove 1 includes windward side ternary distortion wall surface 11 and the distortion of leeward side ternary
Wall surface 13, the three-dimensional twisted 12 pressure sealing ring outer peripheral sidewall of groove bottom that deepens gradually shoal in distorted shape to sealing ring center, and
Intersect with seal face in 3 outside of seals dam.
Windward side ternary distorts wall surface 11, distorts wall surface with the intersecting lens 111 of sealing ring outer peripheral sidewall 4 and leeward side ternary
13 and sealing ring outer peripheral sidewall 4 intersecting lens 131 all perpendicular to seal face.
Windward side ternary distorts wall surface 11 and the intersecting lens of seal face is divided into two sections, and medium inlet side intersecting lens 113 is
Helix, dielectric leakage side intersecting lens 114 are radial alignment；Leeward side ternary distorts intersecting lens point of the wall surface 13 with seal face
It it is two sections, medium inlet side intersecting lens 133 is helix, and dielectric leakage side intersecting lens 134 is radial alignment.
Windward side ternary distorts wall surface 11 and throwing of the three-dimensional twisted intersecting lens 112 for deepening trough wall surface 12 on seal face
Hachure is helix；Leeward side ternary distorts wall surface 13 with the three-dimensional twisted intersecting lens 132 for deepening groove bottom 12 in seal face
On projection line be helix.
Ternary distorts type groove 1 in outer diameter roThe circular arc angle theta at placegWith circular arc angle of the corresponding sealing weir 2 at same Radius
θlThe ratio between θg/θlPreferred value ranging from θg/θl=0.5~2.0.Ternary distorts the radially slotted width (r of type groove 1o-rg) with it is close
Sealing end face width (ro-ri) the ratio between (ro-rg)/(ro-ri) preferred value ranging from 0.45~0.85；The ternary distorts wall surface
11,13 with the radial width (r of seal face medium inlet side intersecting lens 113,133o-rh) and ternary distortion 1 radial width of type groove
(ro-rg) the ratio between (ro-rh)/(ro-rg) value range be 0.5~1.0.The groove depth that ternary distorts type groove is 0~20 μm, entrance
Side depth is 5~20 μm, and leakage side channel depth is 0~5 μm；Wherein, when sealing medium is gas, the slot of the ternary distortion type groove
Depth is 0~12 μm, and entrance side depth is 5~12 μm, and leakage side channel depth is 0~2 μm；When sealing medium is liquid, the ternary
The groove depth for distorting type groove is 0~20 μm, and entrance side depth is 10~20 μm, and leakage side channel depth is 0~5 μm.
It is equipped with the sealing weir 2 that do not slot between the circumferential direction of two neighboring ternary distortion type groove, the ternary distortion type groove 1 is let out
Leakage side is machined with 3 dams of sealing, plays the role of stop seal.
Embodiment two
Referring to Fig. 1,2,3 and 4, the present embodiment and the difference of embodiment one are：Ternary distorts the side wall and sealed end of type groove 1
Medium inlet side intersecting lens in the intersecting lens in face, i.e. windward side ternary distort the intersection of wall surface 11 and seal face leakage hole side
The intersecting lens 133 of line 113 and leeward side ternary distortion wall surface 13 and seal face medium inlet side, is all log spiral.Together
When, windward side ternary distorts wall surface 11 and projection line of the three-dimensional twisted intersecting lens 112 for deepening groove bottom 12 on seal face,
Wall surface 13 and projection line of the three-dimensional twisted intersecting lens 132 for deepening groove bottom 12 on seal face are distorted with leeward side ternary,
All it is log spiral.
Windward side ternary distorts wall surface 11 and deepens projection of the intersecting lens 112 of groove bottom 12 on seal face with three-dimensional
Line, windward side ternary distortion wall surface 11 and the intersecting lens 113 of seal face leakage hole side, leeward side ternary distort wall surface 13 and three
Dimension deepens projection line, leeward side ternary distortion wall surface 13 and seal face of the intersecting lens 132 of groove bottom 12 on seal face
The intersecting lens 133 of medium inlet side is all log spiral.
Remaining is identical as embodiment one.
Embodiment three
With reference to Fig. 5,6, the present embodiment and embodiment one the difference is that, the leeward side ternary distortion wall surface 11 with
Projection line of the three-dimensional twisted intersecting lens 112 for deepening groove bottom 12 on seal face is straight line, the windward side ternary distortion
Wall surface 13 is straight line with projection line of the three-dimensional twisted intersecting lens 132 for deepening trough wall surface 12 on seal face；The leeward side
It is straight line that ternary, which distorts wall surface 11 and the intersecting lens 113 of seal face medium inlet side, and the windward side ternary distorts wall surface 13
Intersecting lens 133 with seal face medium inlet side is straight line.
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 are according to the thinkable equivalent technology means of present inventive concept institute.
Claims (4)
1. a kind of ternary distorts type groove end surface mechanical sealing structure, include the rotating ring and stationary ring of mechanical seal, the rotating ring and quiet
Circumferentially equally distributed ternary distortion type groove (1), the ternary are machined in ring on the seal face of at least one sealing ring
Distortion type groove is made of two side and the three-dimensional twisted groove bottom that deepens, and the side wall of ternary distortion type groove includes the distortion of windward side ternary
Wall surface (11) and leeward side ternary distortion wall surface (13), three-dimensional twisted groove bottom (12) the pressure sealing ring outer peripheral sidewall that deepens is to sealing
Ring center gradually shoals in distorted shape, and intersects with seal face on the outside of seals dam (3)；Ternary distorts the side wall of type groove (1)
Intersecting lens with sealing ring outer peripheral sidewall is perpendicular to seal face；Ternary distorts the intersection of the side wall and seal face of type groove (1)
Line is divided into two sections, and medium inlet side intersecting lens is helix, and dielectric leakage side intersecting lens is radial alignment.
2. ternary according to claim 1 distorts type groove end surface mechanical sealing structure, it is characterised in that：The leeward side three
Member distortion wall surface (13) is spiral with projection line of the three-dimensional twisted intersecting lens (132) for deepening groove bottom (12) on seal face
Line, the windward side ternary distortion wall surface (11) is with the three-dimensional twisted intersecting lens (112) for deepening groove bottom (12) in seal face
On projection line be helix.
3. ternary according to claim 2 distorts type groove end surface mechanical sealing structure, it is characterised in that：The helix
Using log spiral.
4. ternary according to claim 2 or 3 distorts type groove end surface mechanical sealing structure, it is characterised in that：The ternary
Type groove is distorted in outer diameter roThe circular arc angle theta at placegWith circular arc angle theta of the corresponding sealing weir at same RadiuslThe ratio between θg/θlIt is excellent
Choosing value ranging from θg/θl=0.5~2.0；Radially slotted width (the r of the ternary distortion type grooveo-rg) and seal face width
(ro-ri) the ratio between (ro-rg)/(ro-ri) preferred value ranging from 0.45~0.85；The ternary distortion wall surface and seal face position
In the intersecting lens radial width (r of entrance sideo-rh) and ternary distortion type groove radial width (ro-rg) the ratio between (ro-rh)/(ro-rg)
Value range be 0.5~1.0；The groove depth of the ternary distortion type groove is 0~20 μm, and entrance side depth is 5~20 μm, leakage
Side channel depth is 0~5 μm；Wherein, when sealing medium is gas, the groove depth of the ternary distortion type groove is 0~12 μm, and entrance side is deep
Degree is 5~12 μm, and leakage side channel depth is 0~2 μm；When sealing medium is liquid, the groove depth of the ternary distortion type groove is 0~20
μm, entrance side depth is 10~20 μm, and leakage side channel depth is 0~5 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710545326.6A CN107218395B (en) | 2017-07-06 | 2017-07-06 | Ternary distorts type groove end surface mechanical sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710545326.6A CN107218395B (en) | 2017-07-06 | 2017-07-06 | Ternary distorts type groove end surface mechanical sealing structure |
Publications (2)
| Publication Number | Publication Date |
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| CN107218395A CN107218395A (en) | 2017-09-29 |
| CN107218395B true CN107218395B (en) | 2018-11-13 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113669454B (en) * | 2021-08-25 | 2024-05-17 | 江苏金鹰流体机械有限公司 | End face dry gas sealing structure |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3499653A (en) * | 1968-06-05 | 1970-03-10 | Crane Packing Co | Rotary mechanical seal of the gap type |
| US5722665A (en) * | 1992-02-26 | 1998-03-03 | Durametallic Corporation | Spiral groove face seal |
| DE4303050B4 (en) * | 1992-02-26 | 2004-02-26 | Sedy, Josef, Mt. Prospect | Mechanical seal |
| WO1995006212A1 (en) * | 1993-08-26 | 1995-03-02 | Durametallic Corporation | Face seal with double groove arrangement |
| PL187630B1 (en) * | 1998-12-10 | 2004-08-31 | Anga Uszczelnienia Mechaniczne | Contactless mechanical end-face seal |
| CN1272563C (en) * | 2002-11-07 | 2006-08-30 | 约翰克兰鼎名密封(天津)有限公司 | Unit for sealing end surface of 3D helical flute with double helix angles |
| CN201547236U (en) * | 2009-09-15 | 2010-08-11 | 江苏大学 | Novel spiral groove mechanical seal with right triangle-shaped axial cross section |
| US9039013B2 (en) * | 2011-05-04 | 2015-05-26 | United Technologies Corporation | Hydrodynamic non-contacting seal |
| CN104235372A (en) * | 2014-08-29 | 2014-12-24 | 江苏大学 | Dynamic pressure tank mechanical seal structure with improved liquid film cavitation characteristic |
| CN105065675B (en) * | 2015-07-24 | 2017-02-22 | 西华大学 | Seal ring with streamline groove end face and mechanical seal device |
| CN207333698U (en) * | 2017-07-06 | 2018-05-08 | 浙江工业大学 | Ternary distorts type groove end surface mechanical sealing structure |
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2017
- 2017-07-06 CN CN201710545326.6A patent/CN107218395B/en active Active
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