CN108953612A - Shaft sealing device - Google Patents
Shaft sealing device Download PDFInfo
- Publication number
- CN108953612A CN108953612A CN201710358864.4A CN201710358864A CN108953612A CN 108953612 A CN108953612 A CN 108953612A CN 201710358864 A CN201710358864 A CN 201710358864A CN 108953612 A CN108953612 A CN 108953612A
- Authority
- CN
- China
- Prior art keywords
- shaft sealer
- sealing lip
- rubber section
- ptfe
- fixed part
- 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.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 64
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 41
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 41
- 238000004073 vulcanization Methods 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims description 16
- 239000002826 coolant Substances 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 4
- 239000004519 grease Substances 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
-
- 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
- F16J15/324—Arrangements for lubrication or cooling of the sealing itself
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
A shaft seal device includes a rubber portion made of rubber and a PTFE portion made of PTFE, wherein the rubber portion is bonded to the PTFE portion by vulcanization, and the PTFE portion includes a seal lip to be abutted against a shaft, a skeleton for support, and a fixing portion to be abutted against a hole wall of a housing. The shaft sealing device has the advantages of excellent wear resistance, simple structure and low cost.
Description
Technical field
The present invention relates to a kind of shaft sealers, are particularly directed to the shaft sealer of heat management system.
Background technique
In the heat management system for cooling down automobile engine, the axis for sealing the gap between axis and shell is needed
Sealing device, this is a kind of dynamic sealing.
Fig. 1 shows the structure of the shaft sealer 1 according to traditional technology.As shown in Figure 1, the shaft sealer 1 includes:
Sealing 6 made of skeleton 2, spring 4 made of metal and rubber, wherein sealing 6 is in one will contacted with axis to be sealed
Side has dust seal lip 8 and primary seal lip 10.
This shaft sealer is can be good at work with lubricating oil or lubricating grease in the case where.But in heat pipe
In reason system, since coolant can wash out lubricating oil or lubricating grease, it is situated between so not being available lubricating oil or lubricating grease as lubrication
Matter, thus the lubricant medium in heat management system is coolant.However, due to the limitation of engine manufacturing process, in coolant
In be inevitably present some particles.Therefore, main due to lacking sufficient lubrication in the shaft sealer of traditional technology 1
Sealing lip 10 causes shaft sealer 1 to be easy leakage failure by the abrasion of particles in coolant.
Summary of the invention
The problem of in view of above-mentioned traditional technology, the present invention is intended to provide a kind of greasy property and wear-resisting property is excellent, structure
Simple and at low cost shaft sealer.
In order to achieve the above-mentioned object of the invention, the present invention can adopt the following technical scheme that.
A kind of shaft sealer comprising rubber section made of rubber and the portion PTFE made of PTFE, wherein described
For rubber section by bonding by Vulcanization in the portion PTFE, the portion PTFE includes the bone of the sealing lip to abut with axis and support
Frame.
Preferably, the portion PTFE further includes the fixed part abutted to the hole wall with shell.
Preferably, in the mounted state, the sealing lip and axis interference fit and the fixed part and the shell
The hole wall of body is interference fitted.
Preferably, in the mounted state, the sealing lip and the axis are substantially parallel, the radially inner side face of the rubber section
It is spaced apart radially with the sealing lip, so that forming space between the rubber section and the sealing lip.
Preferably, the side of the rubber section contacted with the fixed part has inclined-plane, so that institute in the mounted state
State the maximum in the end compression stress contacted with coolant of rubber section.
Preferably, the sealing lip, the skeleton and the fixed part are provided with groove portion.
Preferably, the fixed part bonding by Vulcanization is coated to the rubber section and by the rubber section.
Preferably, the opposite side of the side to abut with the axis of the sealing lip is covered by the rubber section.
Preferably, the skeleton is formed as bending and is coated by the rubber section.
Preferably, in a pre-installation, the sealing lip, the skeleton and the fixed part form the straight of an intermediate bending
Line.
In shaft sealer of the invention, sealing lip and skeleton are formed by PTFE material.Because PTFE material has certainly
Greasy property, so the sealing lip made of PTFE material has had in the heat management system for for example lacking sufficient lubrication
Sealing performance and low moment of friction.Accordingly ensure that shaft sealer has excellent greasy property and wear-resisting property.
In addition, ensure that the contact sealing stress of sealing lip is different using spring from the shaft sealer of traditional technology, this
The shaft sealer of invention ensures that sealing lip has enough contact sealing stress using the pressure medium of coolant.Thus,
Spring can be saved, number of components is few, installation is simple and at low cost.
Detailed description of the invention
Fig. 1 is to show the partial cross-sectional view of the shaft sealer for heat management system according to traditional technology；
Fig. 2 is to show the partial cross-sectional view of the shaft sealer of first embodiment according to the present invention, and it illustrates axis
State before the installation of sealing device；
Fig. 3 is to show the partial cross-sectional view of the shaft sealer of first embodiment according to the present invention, and it illustrates axis
State after the installation of sealing device；
Fig. 4 is to show the partial cross-sectional view of the shaft sealer of second embodiment according to the present invention, and it illustrates axis
State after the installation of sealing device；
Fig. 5 is to show the partial cross-sectional view of the shaft sealer of third embodiment according to the present invention, and it illustrates axis
State before the installation of sealing device；
Fig. 6 is to show the partial cross-sectional view of the shaft sealer of the 4th embodiment according to the present invention, and it illustrates axis
State before the installation of sealing device.
Description of symbols
1,100,200,300,400 shaft sealer；2 skeletons；4 springs；6 sealings；8 dust seal lips；10 primary seals
Lip；110,210,310,410 rubber section；120,220,320, the portion 420PTFE；122,222,322,422 sealing lip；124,224,
324,424 skeleton；126,226,326,426 fixed part；128a, 128b, 128c groove portion；130 axis；140 shells；E1 first end
Portion；E2 the second end；The first bending part of w1；The second bending part of w2
Specific embodiment
Exemplary embodiments of the present invention are described with reference to the accompanying drawings.It should be appreciated that these specific descriptions are only used for
How teaching those skilled in the art implement the present invention, rather than all feasible modes that exhaustion is of the invention, without in
It limits the scope of the invention.
Firstly, will illustrate first embodiment according to the present invention referring to Fig. 2 and Fig. 3.Fig. 2 and Fig. 3 is to show basis
The partial cross-sectional view of the shaft sealer 100 of first embodiment of the invention, wherein figure 2 show the peaces of shaft sealer 100
State before dress；Fig. 3 shows the state after the installation of shaft sealer 100.
As shown in Fig. 2, shaft sealer 100 includes rubber section 110 made of rubber and the portion PTFE made of PTFE
120.By being bent to form the portion PTFE 120 at the first bending part w1 and the second bending part w2 to support with axis 130 (referring to Fig. 3)
The skeleton 124 of the sealing lip 122, support that connect and the fixed part 126 abutted to the hole wall (referring to Fig. 3) with shell 140.Rubber
Portion 110 is by bonding by Vulcanization in the skeleton 124 in the portion PTFE 120.Rubber section 110 can provide good for shaft sealer 100
Elasticity.
Opposite side in the side to be abutted with axis 130 of sealing lip 122, the first end e1 to first from the portion PTFE 120
Bending part w1 is provided with multiple groove portion 128a at interval, the 110 place side of rubber section of skeleton 124 opposite side, it is close
The side of second bending part w2 is provided with multiple groove portion 128b at interval, and in fixed part 126 to the hole with shell 140
The side of wall abutting is provided with multiple groove portion 128c from the bending part w2 of second end e2 to second in the portion PTFE 120 at interval.Slot
The setting of portion 128a, 128b and 128c are so that sealing lip 122 and fixed part 126 are easy bending during the installation process.In particular, slot
Being provided with for portion 128b is conducive to release folding s tress.The setting of groove portion 128c also helps in the hole of fixed part 126 and shell 140
Labyrinth seal is formed between wall.It is noted that the size of groove portion 128a, 128b and 128c, quantity and setting position be not limited to as
Shown in Fig. 2 and Fig. 3, but can arbitrarily it be arranged according to actual needs.In addition, in some cases, if in 122 He of sealing lip
Bigger contact stress is needed between axis 130 and between fixed part 126 and the hole wall of shell 140, then can be not provided with groove portion
128a, 128b and 128c.
When shaft sealer 100 is installed to axis 130 and shell 140, as shown in figure 3, being base with shaft sealer 100
Standard, the left side in figure are to be referred to as the axially inner side of shaft sealer 100, the right side in figure is properly termed as by sealed sides
Shaft sealer 100 it is axially external.In the case where shaft sealer 100 is used for heat management system, coolant is by sealing
Device 100 is sealed in axially inner side (left side in figure).
As shown in figure 3, in the mounted state, the hole wall of fixed part 126 and shell 140 is interference fitted.With traditional by rubber
Fixed part made of glue is compared, and the intensity of the fixed part 126 made of PTFE is high, so as to keep shaft sealer 100
In correct installation site.
The side of rubber section 110 contacted with fixed part 126 has inclined-plane 112, so that elasticity does not occur in rubber section 110
In the state of deformation, the distance between hole wall of rubber section 110 and shell 140 is from the second portion bending part w2 to PTFE 120
It (in Fig. 3 from right to left) is gradually reduced on the direction of second end e2.In the mounted state, rubber section 110 is fixed the pressure of portion 126
Contracting, and with the corresponding position second end e2 (end contact with the coolant) decrement in the portion PTFE 120 maximum, thus herein
Locate the compression stress maximum of rubber section 110 and rubber section 110 is also maximum to the reaction force of fixed part 126, so as to true
Protect the better seal performance between fixed part 126 and the hole wall of shell 140.
Skeleton 124 can play the role of identical with traditional metallic framework, be used to support entire shaft sealer 100.
As shown in figure 3, in the mounted state, sealing lip 122 and axis 130 are interference fitted and are critical seal point herein.
Because PTFE material has self-lubricating property, in the field for lacking sufficient lubrication of heat management system etc., by
The sealing performance and low moment of friction that sealing lip 122 has had made of PTFE material.In the mounted state, sealing lip 122
Abutting length with axis 130 is about the 1/3 to 2/3 of the axial length of entire shaft sealer 100, preferably sealing lip 122
Abutting length with axis 130 is about the 1/2 of the axial length of entire shaft sealer 100.In addition, due to 122 energy of sealing lip
Enough be mounted to it is substantially parallel with axis 130, so the particle intrusion that can be effectively prevented in coolant and causes close sealing lip 122
Lip 122 is sealed to wear.Accordingly ensure that shaft sealer 100 has excellent wear-resisting property.
Ensure that the contact sealing stress of sealing lip is different using spring from the shaft sealer of traditional technology, in this implementation
In the shaft sealer 100 of mode, the radially inner side face of rubber section 110 is spaced apart radially with sealing lip 122, so that in rubber
Space S is formed between glue portion 110 and sealing lip 122.Coolant is able to enter the space S and the pressure medium of coolant can
By 122 pressed towards axle 130 of sealing lip, to ensure that sealing lip 122 has enough contacts close using the pressure medium of coolant
Seal stress.Thus, the shaft sealer 100 of present embodiment can save spring, and number of components is few, installation is simple.
Therefore, compared with the shaft sealer of traditional technology, the shaft sealer 100 of present embodiment not only wear-resisting property
It is excellent, and structure is simple, and cost can be greatly reduced.
Illustrate second embodiment according to the present invention below with reference to Fig. 4.Fig. 4 is to show the second reality according to the present invention
The partial cross-sectional view of the shaft sealer 200 of mode is applied, it illustrates the states after the installation of shaft sealer 200.In this reality
It applies in mode, indicates identical with first embodiment or similar component and omission pair using the same or similar appended drawing reference
Its explanation.
As shown in figure 4, identical with first embodiment, the shaft sealer 200 of second embodiment also includes by rubber
Manufactured rubber section 210 and the portion PTFE 220 made of PTFE.Rubber section 210 is by bonding by Vulcanization in the portion PTFE 220.PTFE
Portion 220 includes sealing lip 222, skeleton 224 and fixed part 226.
It is different from the first embodiment, in the shaft sealer 200 of present embodiment, the vulcanization of fixed part 226 is viscous
It is connected to rubber section 210 and is coated completely by rubber section 210.By the way that portion 226 is coated and fixed using rubber section 210, can enhance
The intensity of entire shaft sealer 200.In addition, facilitating axis since rubber section 210 secures the shape of fixed part 226
The assembling of sealing device 200.
In addition, in the shaft sealer 200 of present embodiment, the side of sealing lip 222 abutted with axis 230 it is opposite
Side is covered by rubber section 210, more specifically, the rubber lip 212 freely stretched out from the main part of rubber section 210 covers (rubber
The radially inner side face of the main part in portion 210 is spaced apart radially with rubber lip 212, so that forming space S between).
This can be improved the elasticity of sealing lip 222, to ensure the excellent sealing performance of shaft sealer for a long time.
Illustrate third embodiment according to the present invention below with reference to Fig. 5.Fig. 5 is to show third reality according to the present invention
The partial cross-sectional view of the shaft sealer 300 of mode is applied, it illustrates the states before the installation of shaft sealer 300.In this reality
Apply in mode, using the same or similar appended drawing reference indicate with the same or similar component of the first and second embodiments and
Omit its description.
As shown in figure 5, identical with first embodiment, the shaft sealer 300 of third embodiment also includes by rubber
Manufactured rubber section 310 and the portion PTFE 320 made of PTFE.Rubber section 310 is by bonding by Vulcanization in the portion PTFE 320.PTFE
Portion 320 includes sealing lip 322, skeleton 324 and fixed part 326.
It is different from the first embodiment, in the shaft sealer 300 of present embodiment, skeleton 324 is formed as curved
Curved and skeleton 324 is coated by rubber section 310 completely.This greatly increases skeletons 324 on the direction parallel with axis
Intensity, to enhance the intensity of entire shaft sealer 300.
Illustrate the 4th embodiment according to the present invention below with reference to Fig. 6.Fig. 6 is to show the 4th reality according to the present invention
The partial cross-sectional view of the shaft sealer 400 of mode is applied, it illustrates the states before the installation of shaft sealer 400.In this reality
Apply in mode, using the same or similar appended drawing reference indicate with first to the same or similar component of third embodiment and
Omit its description.
As shown in fig. 6, identical with first embodiment, the shaft sealer 400 of the 4th embodiment also includes by rubber
Manufactured rubber section 410 and the portion PTFE 420 made of PTFE.Rubber section 410 is by bonding by Vulcanization in the portion PTFE 420.PTFE
Portion 420 includes sealing lip 422, skeleton 424 and fixed part 426.
It is different from the first embodiment, in the shaft sealer 400 of present embodiment, in a pre-installation, sealing lip
422, skeleton 424 and fixed part 426 form straight line, and centre is not bent.In this way, system can be greatly reduced
It makes the difficulty of processing and reduces cost.
In above-mentioned first to fourth embodiment, shaft sealer only includes rubber section and the portion PTFE, does not have metal bone
Frame and spring, number of components is few, installation is simple and at low cost.
It should be appreciated that above embodiment is merely exemplary, it is not used in the limitation present invention.Those skilled in the art can be with
Various modifications and changes are made to above embodiment under the teachings of the present invention, without departing from the scope of the present invention.
Claims (10)
1. a kind of shaft sealer comprising rubber section made of rubber and the portion PTFE made of PTFE, wherein the rubber
By bonding by Vulcanization in the portion PTFE, the portion PTFE includes the skeleton of the sealing lip to abut with axis and support in glue portion.
2. shaft sealer according to claim 1, which is characterized in that the portion PTFE further includes to the hole wall with shell
The fixed part of abutting.
3. shaft sealer according to claim 2, which is characterized in that in the mounted state, the sealing lip with it is described
Axis interference fit and the hole wall of the fixed part and shell interference fit.
4. shaft sealer according to claim 2, which is characterized in that in the mounted state, the sealing lip with it is described
Axis is substantially parallel, and the radially inner side face of the rubber section is spaced apart radially with the sealing lip, so that in the rubber section
Space is formed between the sealing lip.
5. shaft sealer according to claim 2, which is characterized in that the rubber section is contacted with the fixed part
Side has inclined-plane, so that the rubber section in the mounted state is maximum in the end compression stress contacted with coolant.
6. the shaft sealer according to any one of claim 2-5, which is characterized in that the sealing lip, the skeleton
The fixed part is provided with groove portion.
7. the shaft sealer according to any one of claim 2-5, which is characterized in that the fixed part bonding by Vulcanization arrives
It the rubber section and is coated by the rubber section.
8. shaft sealer according to any one of claims 1-5, which is characterized in that the sealing lip to it is described
The opposite side for the side that axis abuts is covered by the rubber section.
9. shaft sealer according to any one of claims 1-5, which is characterized in that the skeleton is formed as bending
And it is coated by the rubber section.
10. the shaft sealer according to any one of claim 2-5, which is characterized in that in a pre-installation, the sealing
Lip, the skeleton and the fixed part form the intermediate straight line bent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710358864.4A CN108953612A (en) | 2017-05-19 | 2017-05-19 | Shaft sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710358864.4A CN108953612A (en) | 2017-05-19 | 2017-05-19 | Shaft sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108953612A true CN108953612A (en) | 2018-12-07 |
Family
ID=64463074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710358864.4A Pending CN108953612A (en) | 2017-05-19 | 2017-05-19 | Shaft sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108953612A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4166627A (en) * | 1976-10-19 | 1979-09-04 | Garlock Inc. | Thrust washer and combination seal and thrust washer |
| US5106565A (en) * | 1987-03-27 | 1992-04-21 | Nok Corporation | Method for manufacturing hermetically sealing apparatus for sealing two members which rotate relative to each other |
| CN2430300Y (en) * | 2000-01-25 | 2001-05-16 | 徐益淼 | Oil seal |
| US20060012128A1 (en) * | 2000-12-20 | 2006-01-19 | Dominique Lutaud | Lip sealing ring |
| CN1761828A (en) * | 2003-02-13 | 2006-04-19 | 联邦莫沃尔公司 | Bonded ptfe radial shaft seal |
| EP1681498A1 (en) * | 2005-01-12 | 2006-07-19 | Carl Freudenberg KG | Sealing |
| CN101529139A (en) * | 2005-09-12 | 2009-09-09 | 费德罗-莫格尔公司 | Radial seal and method of making |
| CN101701629A (en) * | 2009-11-28 | 2010-05-05 | 烟台润蚨祥油封有限公司 | Rotary oil seal of multi-head spiral oil return line |
| KR20120002135A (en) * | 2010-06-30 | 2012-01-05 | 평화오일씰공업주식회사 | Ptfe oil seal with no adhesive and method for manufacturing the same |
| CN202946682U (en) * | 2012-10-26 | 2013-05-22 | 青岛海力威新材料科技股份有限公司 | Polytetrafluoroethylene oil sealing with side wall boss |
| CN204852351U (en) * | 2015-07-31 | 2015-12-09 | 青岛海力威新材料科技股份有限公司 | Vice seal lip pastes rubber oil seal of polytetrafluoroethylene piece |
| CN205806480U (en) * | 2016-07-14 | 2016-12-14 | 金晓忠 | Politef lip-type packing |
-
2017
- 2017-05-19 CN CN201710358864.4A patent/CN108953612A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4166627A (en) * | 1976-10-19 | 1979-09-04 | Garlock Inc. | Thrust washer and combination seal and thrust washer |
| US5106565A (en) * | 1987-03-27 | 1992-04-21 | Nok Corporation | Method for manufacturing hermetically sealing apparatus for sealing two members which rotate relative to each other |
| CN2430300Y (en) * | 2000-01-25 | 2001-05-16 | 徐益淼 | Oil seal |
| US20060012128A1 (en) * | 2000-12-20 | 2006-01-19 | Dominique Lutaud | Lip sealing ring |
| CN1761828A (en) * | 2003-02-13 | 2006-04-19 | 联邦莫沃尔公司 | Bonded ptfe radial shaft seal |
| EP1681498A1 (en) * | 2005-01-12 | 2006-07-19 | Carl Freudenberg KG | Sealing |
| CN101529139A (en) * | 2005-09-12 | 2009-09-09 | 费德罗-莫格尔公司 | Radial seal and method of making |
| CN101701629A (en) * | 2009-11-28 | 2010-05-05 | 烟台润蚨祥油封有限公司 | Rotary oil seal of multi-head spiral oil return line |
| KR20120002135A (en) * | 2010-06-30 | 2012-01-05 | 평화오일씰공업주식회사 | Ptfe oil seal with no adhesive and method for manufacturing the same |
| CN202946682U (en) * | 2012-10-26 | 2013-05-22 | 青岛海力威新材料科技股份有限公司 | Polytetrafluoroethylene oil sealing with side wall boss |
| CN204852351U (en) * | 2015-07-31 | 2015-12-09 | 青岛海力威新材料科技股份有限公司 | Vice seal lip pastes rubber oil seal of polytetrafluoroethylene piece |
| CN205806480U (en) * | 2016-07-14 | 2016-12-14 | 金晓忠 | Politef lip-type packing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181207 |
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| RJ01 | Rejection of invention patent application after publication |