CN107143655A - Turn round the floating type dynamic sealing device of pyrolysis oven automatic tightening - Google Patents
Turn round the floating type dynamic sealing device of pyrolysis oven automatic tightening Download PDFInfo
- Publication number
- CN107143655A CN107143655A CN201710496398.6A CN201710496398A CN107143655A CN 107143655 A CN107143655 A CN 107143655A CN 201710496398 A CN201710496398 A CN 201710496398A CN 107143655 A CN107143655 A CN 107143655A
- Authority
- CN
- China
- Prior art keywords
- dynamic sealing
- sealing ring
- automatic tightening
- pyrolysis oven
- sealing
- 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.)
- Granted
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
- C10B47/28—Other processes
- C10B47/30—Other processes in rotary ovens or retorts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Abstract
Pyrolysis oven automatic tightening formula dynamic sealing system is turned round the invention provides one kind, including sealing ring, the sealing ring center is connected to dynamic sealing plate, it is to be slidably connected between the sealing ring and dynamic sealing plate, the sealing ring is provided with the pretightning force for promoting to seal ring inner surface and dynamic sealing plate outer surface gluing, sealing, dynamic sealing plate bottom is connected to link, and thermal insulation board is provided between the dynamic sealing plate and link.The continuous pyrolysis equipment of the present invention is used as a kind of agriculture and forestry organic waste material processing equipment gently simplified, applied to vast rural area, whole equipment requires economical adaptation, in the economic overall rural area fallen behind relatively, there is application value, the equipment dynamic sealing device is simple in construction, easy to maintenance, use cost is low, and adapts to the operating environment under equipment hot conditions.
Description
Technical field
The present invention relates to technical field of sealing technology, more particularly to a kind of revolution pyrolysis oven sealing device, a kind of return is specifically referred to
Turn pyrolysis oven automatic tightening formula dynamic sealing system.
Background technology
According to retrieval, there is following correlation technique on pyrolysis oven sealing system：
Chinese patent discloses Application No. 200610156882.6, a kind of entitled patent of invention of dynamic sealing device, its peace
Loaded between rotating shaft and casing, and it is sheathed in rotating shaft, the dynamic sealing device includes a pedestal annular in shape and positioned at pedestal
Interior sealing ring group, the sealing ring group includes the inner seal ring and outer seal ring along the radially inner and outer setting of rotating shaft, inside and outside close
Multiple flutings are along the circumferential direction evenly equipped with seal ring respectively, the fluting is extended through in the inside and outside of the inside and outside sealing ring
Between footpath, and the position slotted on inside and outside sealing ring is circumferentially mutually staggered.It is in using the dynamic sealing device of said structure
During working condition, it can keep axially with moving radially, it can be with rotating shaft free floating, therefore, dynamic sealing device of the present invention
Service life is higher, and sealing property preferably, can meet high temperature, the seal request of high pressure.
Chinese patent discloses Application No. 201410292555.8, and a kind of entitled invention of floating seal is special
Profit, belongs to oily husky, oil shale rotary dry distillation technical field, contains outer simplified, inner barrel, inner barrel supporting, conveyance conduit, pipeline
Outer wall movable sleeving, seal receptacle, static seal A, dynamic seal, sunk screw, static seal B, sealing gland, spring, spring base,
Bolt, nut etc..Inner barrel is connected with conveyance conduit one end, and pipeline outer wall movable sleeving is housed on conveyance conduit, and pipeline outer wall is moved
Dynamic set outside coordinates with dynamic seal endoporus spherical cambered surface, and seal receptacle is connected through conveyance conduit with outer cylinder body, static seal periphery and
Seal receptacle fit inside, static seal is combined with dynamic seal makes conveyance conduit can be close in diverse location with outer cylinder body confluce
Envelope.Dynamic seal of the present invention floats with inner barrel change in location, and device sealing property is reliable, installs, adjusts and easy to maintenance,
It ensure that oily husky, oil shale retorting is smoothed out.
Dynamic sealing mode common at present includes：Cup packing, piston ring sealing, helixseal, pneumostop, waterpower are close
Envelope, centrifugal seal, packing seal, labyrinth seal, mechanical seal etc..
Found by above-mentioned retrieval, current equipment has some drawbacks, such as device structure is complicated, inconvenient maintenance, peace
Full poor performance, short life, cost is high, the problem of hot operation is unstable.
The content of the invention
The technical problem to be solved in the present invention is that the weak point present in prior art is pyrolyzed there is provided one kind revolution
Stove automatic tightening formula dynamic sealing system, the biomass continuous pyrolysis equipment is set as a kind of agriculture and forestry organic waste material processing gently simplified
Standby, applied to vast rural area, whole equipment requires economical adaptation, in the economic overall rural area fallen behind relatively, pushes away
Wide application value, the equipment dynamic sealing device is simple in construction, easy to maintenance, use cost is low, and adapts to equipment high temperature bar
Operating environment under part.
The technical solution of the present invention is to provide a kind of following revolution pyrolysis oven automatic tightening formula dynamic sealing system, bag
Sealing ring is included, the sealing ring center is connected to dynamic sealing plate, it is described close to be slidably connected between the sealing ring and dynamic sealing plate
Seal ring is provided with the pretightning force for promoting to seal ring inner surface and dynamic sealing plate outer surface gluing, sealing.
Preferably, dynamic sealing plate bottom is connected to link, thermal insulation board is provided between the dynamic sealing plate and link.
Preferably, being to be fixedly connected between the dynamic sealing plate, thermal insulation board and link.
Preferably, the dynamic sealing plate, thermal insulation board or/and link are set for annular.
Preferably, the sealing ring section is wedge shape, the sealing ring bottom is provided with the tangent plane being obliquely installed, in addition to
The end sleeve on body of heater is pyrolyzed, the end sleeve is provided with the static seal plate that the tangent plane being obliquely installed with sealing ring coordinates.
Preferably, the static seal plate is obliquely installed in a ring, the static seal plate bottom, which is provided with, to be used to support quiet close
The support frame of shrouding, support frame as described above is connected with end sleeve.
Preferably, being additionally provided with pressing device at the top of the sealing ring, the pressing device is clamping hoop, the compression
Anchor ear is provided with the adjusting means that pretightning force is provided for sealing ring, and the adjusting means is clip and locking regulating bolt.
Preferably, the link bottom is connected with rotating cylinder.
Preferably, the shear-face angle is 37 ± 5 °, the fixed company between the dynamic sealing plate, thermal insulation board and link
It is connected in bolt connection.
Preferably, described turn round pyrolysis oven automatic tightening formula dynamic sealing system in symmetrical arrangement in rotating cylinder both sides,
Lubricating oil is scribbled between the sealing ring and quiet, dynamic sealing plate, the lubricating oil simultaneously forms one layer of sealing oil film.
Using the beneficial effect of the technical program：
1st, sealing ring section is wedge shape, general to be made of the silica gel with certain elasticity, is divided into static seal face and dynamic sealing face,
Dynamic sealing face is brought into close contact with equipment, it is frayed after, can automatic tightening, improve before sealing property and service life, with improvement
Compare, sealing system service life can improve more than 5 times；Static seal face keeps pressured state, it is ensured that its sealing.
2nd, the binding face and equipment application in dynamic sealing face be heat-insulated and cooling mechanism, binding face is kept relatively low temperature, one
As be no more than 200 DEG C, while dynamic sealing face and static seal face are lubricated sealing using oil film, sealing effectiveness can be improved, prolonged
Long life.
3rd, the pretightning force of flexible clip can adjust automatically, also can be by manually adjusting, it is ensured that system sealing of knowing clearly can
By property.
Revolving drum operating temperature reaches as high as that fin is housed in 700 degree or so, supporting plate and dynamic sealing plate in equipment, profit
The device is used, 200 degree are usually no more than.
Reliable using the pyrolysis oven system run all right of the technical program, using peanut shell as raw material, feed throughput is
28.2kg/h, charcoal yield is 29.3%, and fuel gases calorific value is 15.3MJ/Nm3, temperature control precision is ± 16 DEG C, every technology
Index has reached system design goal and requirement.The exploitation of the pilot test system is that equipment is amplified and Demonstration Application has established base
Plinth.
Brief description of the drawings
Structural representations of the Fig. 1 for revolution pyrolysis oven automatic tightening formula dynamic sealing system on pyrolysis oven.
Fig. 2 is the partial enlarged drawing of sealing system in Fig. 1.
Fig. 3 is sealing system overlooking the structure diagram.
Embodiment
For purposes of illustration only, below in conjunction with the accompanying drawings, the revolution pyrolysis oven automatic tightening formula dynamic sealing system to invention is done in detail
Explanation.
Carburizing temperature is general at 700 DEG C or so in patent use of the present invention, and the temperature of dynamic sealing plate is usually no more than 200
DEG C, revolving drum rotating speed is general in 1 ~ 5r/min；Clamping hoop pretightning force general control is in 4 ~ 7 Nm, and thermal insulation board is typically using resistance to
High temperature back-fire relief heat-barrier material, thickness is not less than 20mm in principle；It is secured together by bolt, in such hot environment
Under, the temperature distortion already of common silicone gasket or even melt, the present invention can preferably solve the problems, such as thawing.
As shown in Figure 1 to Figure 3, a kind of revolution pyrolysis oven automatic tightening formula dynamic sealing system, including sealing ring 2, it is described
The center of sealing ring 2 is connected to dynamic sealing plate 3, to be slidably connected between the sealing ring 2 and dynamic sealing plate 3, is set on the sealing ring 2
There is the pretightning force for promoting the inner surface of sealing ring 2 and the outer surface gluing, sealing of dynamic sealing plate 3；The bottom of dynamic sealing plate 3 is connected to link
5, thermal insulation board 4 is provided between the dynamic sealing plate 3 and link 5；It is between the dynamic sealing plate 3, thermal insulation board 4 and link 5
It is fixedly connected；The dynamic sealing plate 3, thermal insulation board 4 or/and link 5 are set for annular, and concentrically ring structure is set；It is described
The section of sealing ring 2 is wedge shape, and the bottom of sealing ring 2 is provided with the end sleeve on the tangent plane being obliquely installed, in addition to pyrolysis body of heater
Cylinder 10, the end sleeve 10 is provided with the static seal plate 7 that the tangent plane being obliquely installed with sealing ring 2 coordinates；The static seal plate 7
Be obliquely installed in a ring, the bottom of static seal plate 7, which is provided with, is used to supporting the support frame 6 of static seal plate 7, support frame as described above 6 with
End sleeve 10 is connected；The top of sealing ring 2 is additionally provided with pressing device 8, and the pressing device 8 is clamping hoop, the pressure
Hug hoop and be provided with the adjusting means that pretightning force is provided for sealing ring 2, the adjusting means is clip and locking regulating bolt；Institute
The bottom of link 5 is stated to be connected with rotating cylinder 9；The shear-face angle is 37 ± 5 °, the dynamic sealing plate 3, thermal insulation board 4 and link 5
Between be fixedly connected as bolt connection；The revolution pyrolysis oven automatic tightening formula dynamic sealing system is turning in symmetrical arrangement
9 both sides of cylinder, scribble lubricating oil between the sealing ring 2 and quiet, dynamic sealing plate 3, the lubricating oil simultaneously forms one layer of sealing oil film.
Described thermal insulation board can design for a complete loop configuration body, or the loop configuration with hollow out,
It is also designed to, with loop configuration jaggy, or independent Curved plate structure, link be separated with dynamic sealing plate, kept away
The high temperature for exempting from link is directly passed to dynamic sealing plate there is provided the service life of sealing ring.
In the above-described embodiments, the preferred forms to the present invention are described, it is obvious that in the invention structure of the present invention
Under think of, many changes can be still made, here, it should be noted that any change made under the inventive concept of the present invention all will
Fall within the scope of protection of the present invention.
Claims (10)
1. one kind revolution pyrolysis oven automatic tightening formula dynamic sealing system, it is characterized in that：Including sealing ring（2）, the sealing ring（2）
Center is connected to dynamic sealing plate（3）, the sealing ring（2）With dynamic sealing plate（3）Between to be slidably connected, the sealing ring（2）On
Provided with promoting sealing ring（2）Inner surface and dynamic sealing plate（3）The pretightning force of outer surface gluing, sealing.
2. revolution pyrolysis oven automatic tightening formula dynamic sealing system according to claim 1, it is characterized in that：Dynamic sealing plate（3）
Bottom is connected to link（5）, the dynamic sealing plate（3）With link（5）Between be provided with thermal insulation board（4）.
3. revolution pyrolysis oven automatic tightening formula dynamic sealing system according to claim 2, it is characterized in that：The dynamic sealing plate
（3）, thermal insulation board（4）And link（5）Between to be fixedly connected.
4. the revolution pyrolysis oven automatic tightening formula dynamic sealing system according to Claims 2 or 3, it is characterized in that：It is described dynamic close
Shrouding（3）, thermal insulation board（4）Or/and link（5）For annular setting.
5. revolution pyrolysis oven automatic tightening formula dynamic sealing system according to claim 4, it is characterized in that：The sealing ring
（2）Section is wedge shape, the sealing ring（2）Bottom is provided with the end sleeve on the tangent plane being obliquely installed, in addition to pyrolysis body of heater
（10）, the end sleeve（10）It is provided with and sealing ring（2）The static seal plate that the tangent plane being obliquely installed coordinates（7）.
6. revolution pyrolysis oven automatic tightening formula dynamic sealing system according to claim 5, it is characterized in that：The static seal plate
（7）It is obliquely installed in a ring, the static seal plate（7）Bottom, which is provided with, to be used to support static seal plate（7）Support frame（6）, it is described
Support frame（6）With end sleeve（10）Connection.
7. the revolution pyrolysis oven automatic tightening formula dynamic sealing system according to claim 1 or 6, it is characterized in that：The sealing
Ring（2）Top is additionally provided with pressing device（8）, the pressing device（8）For clamping hoop, the clamping hoop is provided with as sealing
Ring（2）The adjusting means of pretightning force is provided, the adjusting means is clip and locking regulating bolt.
8. according to any described revolution pyrolysis oven automatic tightening formula dynamic sealing system of claim 2,3,5,6, it is characterized in that：Institute
State link（5）Bottom and rotating cylinder（9）Connection.
9. revolution pyrolysis oven automatic tightening formula dynamic sealing system according to claim 5, it is characterized in that：The shear-face angle
For 37 ± 5 °, the dynamic sealing plate（3）, thermal insulation board（4）And link（5）Between be fixedly connected as bolt connection.
10. revolution pyrolysis oven automatic tightening formula dynamic sealing system according to claim 1, it is characterized in that：The revolution heat
Stove automatic tightening formula dynamic sealing system is solved in symmetrical arrangement in rotating cylinder（9）Both sides, the sealing ring（2）With quiet, dynamic sealing
Plate（3）Between scribble lubricating oil, the lubricating oil simultaneously forms one layer of sealing oil film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710496398.6A CN107143655B (en) | 2017-06-26 | 2017-06-26 | Turn round the floating type dynamic sealing device of pyrolysis oven automatic tightening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710496398.6A CN107143655B (en) | 2017-06-26 | 2017-06-26 | Turn round the floating type dynamic sealing device of pyrolysis oven automatic tightening |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107143655A true CN107143655A (en) | 2017-09-08 |
| CN107143655B CN107143655B (en) | 2019-05-17 |
Family
ID=59784254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710496398.6A Active CN107143655B (en) | 2017-06-26 | 2017-06-26 | Turn round the floating type dynamic sealing device of pyrolysis oven automatic tightening |
Country Status (1)
| Country | Link |
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| CN (1) | CN107143655B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108468809A (en) * | 2018-04-03 | 2018-08-31 | 农业部规划设计研究院 | A kind of biomass continuous pyrolysis dynamic sealing mechanism and method |
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| JPH10141624A (en) * | 1996-11-14 | 1998-05-29 | Ishikawajima Harima Heavy Ind Co Ltd | Circumferential seal device for rotary grate furnace |
| CN202032289U (en) * | 2011-04-15 | 2011-11-09 | 宁波明欣化工机械有限责任公司 | Low temperature thermal insulation shaft sleeve |
| CN103470763A (en) * | 2013-09-03 | 2013-12-25 | 南宁广发重工集团有限公司 | Rotary body combined seal device |
| CN204329586U (en) * | 2014-11-19 | 2015-05-13 | 徒雨龙 | The V-shaped seal ring hermetically-sealed construction of rotary furnace |
| CN204373380U (en) * | 2014-12-04 | 2015-06-03 | 成都昊特新能源技术股份有限公司 | Pyrolysis rotary kiln hermetically-sealed construction |
| CN205878897U (en) * | 2016-07-06 | 2017-01-11 | 泰州市华威窑炉设备有限公司 | Rotary kiln seal structure |
| CN106369167A (en) * | 2016-11-10 | 2017-02-01 | 丹东克隆集团有限责任公司 | Integrated external spring compensation type mechanical sealing device |
| CN106482506A (en) * | 2016-12-12 | 2017-03-08 | 朱书红 | Rotary sealing mechanism |
| CN206113621U (en) * | 2016-08-25 | 2017-04-19 | 中国重型机械研究院股份公司 | Pyrolysis kiln sealing device |
| CN206146177U (en) * | 2016-11-09 | 2017-05-03 | 陈实 | Rotary kiln hood sealing device and use this sealing device's rotary kiln |
| CN207178693U (en) * | 2017-06-26 | 2018-04-03 | 农业部规划设计研究院 | Turn round the floating type dynamic sealing device of pyrolysis oven automatic tightening |
-
2017
- 2017-06-26 CN CN201710496398.6A patent/CN107143655B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10141624A (en) * | 1996-11-14 | 1998-05-29 | Ishikawajima Harima Heavy Ind Co Ltd | Circumferential seal device for rotary grate furnace |
| CN202032289U (en) * | 2011-04-15 | 2011-11-09 | 宁波明欣化工机械有限责任公司 | Low temperature thermal insulation shaft sleeve |
| CN103470763A (en) * | 2013-09-03 | 2013-12-25 | 南宁广发重工集团有限公司 | Rotary body combined seal device |
| CN204329586U (en) * | 2014-11-19 | 2015-05-13 | 徒雨龙 | The V-shaped seal ring hermetically-sealed construction of rotary furnace |
| CN204373380U (en) * | 2014-12-04 | 2015-06-03 | 成都昊特新能源技术股份有限公司 | Pyrolysis rotary kiln hermetically-sealed construction |
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| CN206113621U (en) * | 2016-08-25 | 2017-04-19 | 中国重型机械研究院股份公司 | Pyrolysis kiln sealing device |
| CN206146177U (en) * | 2016-11-09 | 2017-05-03 | 陈实 | Rotary kiln hood sealing device and use this sealing device's rotary kiln |
| CN106369167A (en) * | 2016-11-10 | 2017-02-01 | 丹东克隆集团有限责任公司 | Integrated external spring compensation type mechanical sealing device |
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| CN207178693U (en) * | 2017-06-26 | 2018-04-03 | 农业部规划设计研究院 | Turn round the floating type dynamic sealing device of pyrolysis oven automatic tightening |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108468809A (en) * | 2018-04-03 | 2018-08-31 | 农业部规划设计研究院 | A kind of biomass continuous pyrolysis dynamic sealing mechanism and method |
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| Publication number | Publication date |
|---|---|
| CN107143655B (en) | 2019-05-17 |
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