CN102374292B - Black box, with the device of this black box and encapsulating method - Google Patents
Black box, with the device of this black box and encapsulating method Download PDFInfo
- Publication number
- CN102374292B CN102374292B CN201110259521.5A CN201110259521A CN102374292B CN 102374292 B CN102374292 B CN 102374292B CN 201110259521 A CN201110259521 A CN 201110259521A CN 102374292 B CN102374292 B CN 102374292B
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- China
- Prior art keywords
- core
- sealing
- black box
- plunger
- chamber
- 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.)
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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
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0408—Pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0448—Sealing means, e.g. for shafts or housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/143—Sealing provided on the piston
-
- 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
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
- F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings
-
- 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
- F16J15/56—Other sealings for reciprocating rods
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The present invention relates to a kind of black box, with the device of this black box and encapsulating method.Black box according to the present invention includes: the sealing core can being placed in chamber, piston or plunger are relative to chamber movement the most in use；Front sealing device；With rear sealing device, sealing core is relative to chamber movement the most in use, thus obtains sealing force.
Description
Technical field
The present invention relates to a kind of black box for sealing piston or plunger.More particularly, according to the present invention's
Black box relate to a kind of can under the pressure of up to 2000 bars the high-pressure sealing ring of reliably working.Such pressure
Power can run into when such as processing oil water mixture.
Background technology
Known sealing member is generally made up of polyurethane, and itself is suitable for use with oil condition.But,
When processing water or oil water mixture, performance the most significantly declines, and is especially generally reaching the relative of 2000 bars
Under high pressure.
Summary of the invention
It is an object of the invention to provide a kind of black box for sealing piston or plunger, itself and known sealing
Part compares the performance with improvement.
To be used for sealing piston according to the black box of the present invention or plunger is capable of above-mentioned purpose, this sealing group
Part includes:
-sealing the core that can be placed in chamber, piston or plunger are relative to chamber movement the most in use；
-front sealing device；With
-rear sealing device, sealing core is relative to chamber movement the most in use, thus obtains sealing force.
Such as, may be used for piston or plunger according to the black box of the present invention.Generally plunger displacement pump from be built-in with toward
The cylinder body of the plunger of multiple motion is constituted.Inlet valve and dump valve are typically mounted in the head of this cylinder body.Sucking punching
Cheng Zhong, plunger retreats and inlet valve is opened, so that fluid enters cylinder body.In forward stroke, plunger is by discharging
Fluid is released cylinder body by valve.
The purpose of the application is, for piston, the power on black box that acts on is compared with the situation of plunger
It is contrary.
Black box according to the present invention is with sealing core, front sealing device and rear sealing device.Seal core
In the chamber of the device that can be placed on similar pump.In use, chamber is relative to piston or plunger motion.According to
The present invention, seals core in use relative to chamber movement, thus the sealing force needed for obtaining.In this way,
Sealing force is suitable to the power acting on black box.
Such as, entering in stroke and in resting state, sealing device should be able to as faucet
Negative pressure is kept or close to vacuum in the case of low pressure source feedway.Black box is needed to be sealed against dress in side
The chamber put also is sealed against plunger at opposite side.Front sealing device seals between sealing core and chamber.
Rear sealing device seals between core and plunger.
In discharge or compression stroke, black box will face higher pressure.Similarly, front sealing device exists
Sealing between core and chamber, rear sealing device seals between core and plunger.Front sealing device quilt
Pressure in cylinder body pushes against sealing core and chamber, so that the power of front sealing device outwards guides, is the most only close
Envelope core provides the assistance of minimum against core plunger.When along away from cylinder body volume direction promote black box and
When the fluid compressed is against supporting zone, core increases against the sealing force of plunger along with the increase of cylinder interior pressure
Greatly.This is sealed against plunger for sealing core and provides active force.
By automatically increasing sealing force according to the pressure in cylinder body, black box can normally run until phase
To higher pressure.Such as, illustrate the black box according to the present invention and be higher than 10 bars at pressure, higher than 500
Bar, higher than 1000 bars, higher than 1500 bars and until in the oil water mixture of 2000 bars use time can normally transport
OK.
Preferably, front sealing device includes the O being arranged in the recess recess sealing core.Also, it is preferred that
Ground, rear sealing device includes the O being arranged in the groove sealing core.Sealing core is preferably provided in
In fluid or in the device of similar pump.In order to regulation sealing force, sealing core can be according to along plunger or piston
The active force that acts on black box of actual direction move slightly relative to chamber.Preferably, front sealing fills
Put and/or rear sealing device includes the butadiene acrylonitrile rubber (NBR) that Shore hardness is 70.Preferably, seal core to include
Polymeric material, the ultra-high molecular weight polyethylene (UHMWPE) of most preferably 1000 grades.This special
Material relatively easily obtains, and conventional tool can be utilized to carry out polish, has wearability simultaneously, and can
To apply together with water and/or chemicals.
As an attendant advantages according to the present invention, assembly is relatively easy to install.Additionally, seal dress installing
When putting, the risk of breakseal part is minimum, thereby adds the efficiency of the black box according to the present invention.
Another attendant advantages of black box according to the present invention is, it is possible to use usual retrievable material and
Need not the polish of difficulty and costliness.This causes the cost-effective reduction of the black box according to the present invention.
According to a preferred embodiment of the present invention, seal core and be provided with opening with holes, wherein using
Make plunger be arranged in opening, and the size of its mesopore is less than the size of plunger.
Be there is by offer the sealing core in hole less compared with the outside dimension of core plunger, seal the material of core
Material is stretched and thereby obtains the effect of low pressure seal, and the outside dimension sealing core the most slightly increases.Close with known
Sealing is different, and this sealing core can only stretch and can not compress.This is obtained in that required sealing force.
In the example shown in the series of figures, plunger is provided with the diameter of 8mm.Core hole is provided with the diameter of 7.5mm.Work as plunger
Time in insertion core hole, core is stretched to obtain pretension, reaches the effect of low pressure seal.It addition, stretching is examined
Consider abrasion when longtime running does not reduce low pressure seal effect.This improves the effect of the black box according to the present invention
Rate.The external diameter sealing core is slightly less than the chamber size of device.Such as, the external diameter sealing core is 15.76mm,
And the aperture of chamber is 16mm.According to above-mentioned plunger and the size in core hole, core is stretched, and core
External diameter will reach 16mm after mounting, the most accurately the size with chamber matches.So, excellent at this
Select in embodiment, seal the outside dimension size less than the chamber of fluid cylinder head of core.
Preferably, plunger, chamber, the size in core hole are mated with sealing core outside dimension, cause and are inciting somebody to action
After plunger is installed in core, seals core and meet the size of chamber.In use, it has preferably stretched close
The material of envelope core.
Preferably, before and after plunger and black box are arranged in chamber, seal core size in
Following relation:
Before area outer diameter-installation before the final internal diameter=installation of the final external diameter-core in region of core
Internal diameter.
In the examples described above, the external diameter before installation be 15.76mm, internal diameter be 7.5mm.In core after installation
Footpath is 8mm, core external diameter is 16mm.In this example, the outside dimension sealing core before installation is less than chamber
The size of room.This can stretch the material of core.
In an alternative preferred embodiment according to the present invention, seal the outside dimension chi more than chamber of core
Very little, the size in hole is more than piston or the size of plunger.
By providing size to seal core and size also greater than piston or the hole of plunger more than chamber, above close
Envelope principle is reversed, and causes according to term used herein, and black box can serve as piston seal.All
Size is interrelated with similar fashion as above.
According to a preferred embodiment of the present invention, rear sealing device is sealed against propping up of main body in use
Support region.
By the supporting zone against main body, sealing force increases along with the pressure that cylinder interior is run into and increases.
Preferably, main body is sealing shroud (gland) or like.Preferably, rear sealing device is arranged on sealed core
In the groove in portion.It is also preferable that this groove is configured to almost to accommodate the similar O that is fully compressed
Rear sealing device.When cylinder body volume is pressurized, the whole front region of black box is by active force.By compression
Rear sealing device counteracting force is provided and braces against the black box of main body.Due to rear sealing device against master
The supporting zone of body, less than the front region of black box, seals the pressure produced in the groove of core more than acting on
Front pressure on black box.This makes sealing force be more than the front pressure of cooperation, is thereby formed and is suitable to sealing group
The tight seal of the active force of part.The counteracting force that bigger active force generation is slightly bigger, and relatively small work
Firmly produce less counteracting force.Which reduce the abrasion of the black box according to the present invention.
The invention still further relates to a kind of device being provided with above-mentioned black box.
This device provides the effect identical with black box and advantage.Such as, this device is piston pump, post
Plug pump or electromotor.
The present invention further relates to a kind of encapsulating method, and the method includes the step providing above-mentioned black box.
This method provides the effect identical with black box and advantage.
Accompanying drawing explanation
The further advantages of the present invention, feature and details will combine accompanying drawing based on its preferred embodiment and explain
State, wherein:
-Fig. 1 shows the plunger seal of the high-pressure pump according to the present invention；
-Fig. 2 shows the sealing core of Fig. 1；
-Fig. 3 A and B shows the black box of Fig. 1；
-Fig. 4 A and B respectively illustrates the black box in induction stroke and compression stroke；With
-Fig. 5 shows the alternate embodiments of the black box according to the present invention.
Detailed description of the invention
Black box 2 (Fig. 1) can use in high-pressure pump 4.Pump 4 includes that fluid cylinder head 6, sealing member prop up
Support plate 8 and sealing shroud 10.Additionally, pump 4 is provided with import 12 and inlet check valve 14, and exports 16 and go out
Mouth check-valves 18.Plunger 20 axially can move along it in the direction A corresponding with induction stroke, and with
Discharge or direction B corresponding to compression stroke moves.Black box 2 includes being placed in the chamber 23 of pump 4
Core 22, front O 24 and rear O 26.In the illustrated embodiment, O 22 and 24 is by Xiao
Family name's hardness be 70 NBR make.Seal core 22 to cut with simple sharp keen cutter on standard lathe.
Seal the UHMWPE that basic material is 1000 grades of core 22.
Core 22 (Fig. 2) has the hole 28 for plunger 20, the recess 30 for O 24 and for O
The groove 32 of shape circle 26.In the illustrated embodiment, a diameter of 7.5mm in hole 28, groove 32 is wherein
A diameter of 11.5mm of heart line, and groove 32 to enter the degree of depth of core 22 be 1.5mm, the maximum of groove 32
Width is 2mm.Core 22, along its axial a length of 6.5mm, is 2.5mm for recess 30.Core 22
External diameter be 15.76mm, the external diameter of recess 30 is 12.4mm.
Black box 2 includes core 22 and the O 24,26 (Fig. 3 A and B) being installed together.At figure
In the embodiment shown, diameter of plunger is 8mm, for black box 2 provide pump 4 fluid cylinder head 6 in recessed
Portion or a diameter of 16mm of chamber.For given size, core 22 is installing the surface area before plunger 20
For 150.8mm2, so that after mounting, the internal diameter of core 22 is stretched to 8mm, and external diameter is stretched to 16mm,
To fit snugly in the chamber 23 being located in fluid cylinder head 6.
Without compression assembly 2 in black box 2 is assemblied in chamber 23.Therefore, assembly 2 need not pre-add should
Power.When inserting plunger 20, assembly 2 is stretched and is sealed against the wall of chamber 23.Therefore, chamber 23 He
(radially) of core 22 is basically the same.
In the illustrated embodiment, O 26 extends about 0.5mm after core 22.It appeared that at root
According in the assembly 2 of the present invention, compared with the volume of O 26 groove corresponding with core 22 the biggest 15%.
In use, O 26 is pushed against the wall 38 (as mentioned below) of chamber 23, and assembly has about 0.5mm
Stroke.The inner surface relatively flat or smooth of core 22, to stop such as by the infiltration of groove.Against post
Sealing of plug 20 occurs substantially throughout the whole inner surface of core 20.Preferably, the respective table of plunger 20
Face is also configured as relatively flat or smooth.
Under relatively low pressure, assembly 2 is sealed against plunger 20 at substantially whole inner surface throughout core 22,
And substantially against chamber 23 at O 24.Along with the increase of pressure, assembly 2 pushes against chamber 23
Wall 38, O 26 contact with this wall with obtain act essentially against the additional seal power on rear side of assembly 2, this
To describe in detail below.
One advantage of black box 2 is to use rod-type material so that core 22 and two O 24,26
Produce relatively direct and rapid.It is a further advantage in that the mill not only reducing assembly 2 compared with traditional sealing member
Damage, be mainly inner surface the most in use and also demonstrate this point against plunger 20.Due to this abrasion be by
Gradually producing, therefore it allows relatively simple replacing.
In plunger displacement pump 4, in induction stroke or when static, black box 2 and the surface of fluid cylinder head 6
Region 34 coordinates.Front O 24 seals core 22 against fluid cylinder head 6 along region, surface 36.Rear O shape
Circle 26 and region, surface 38 gentle touchdown of seal backup disc 8, and seal the core 22 surface against plunger 20
Region 40 core.Enter or induction stroke during or when static (Fig. 4 A), black box 2 makes in pump 4
Keep negative pressure.It is sealed against surface 36 by O 24, and is sealed against by the tensile elasticity of core 22
Surface 40, it is possible to achieve above-mentioned negative pressure.
In discharge or compression stroke (Fig. 4 B), active force acts on surface 34.In terms of the direction of cylinder body,
The core of promotion axially backward 22 along plunger 20.O is passed through in sealing between core 22 and fluid cylinder head 6
24 obtain on surface 36.Along with core 22 is pushed backwards, O 26 in groove 32 by surface district
Territory 38 promotes or compresses.Groove 32 is configured to accommodate the O 26 compressed the most completely.Due to surface
Specific surface region 34, region 38 is little, and the pressure ratio produced in the groove 32 of core 22 is against region, surface 34
Front pressure is bigger.This causes on the region, surface 40 that sealing force acts on plunger 20, thus realizes fastening close
Envelope.By discharging or in force profile 42 (Fig. 4 B) and induction stroke in compression stroke or during resting position
Force profile 44 (Fig. 4 A) compares, it is possible to diagram this point.This also makes the inner side at pump 4 define
Sealing force with the pressure correlation applied.This automatic transformation of the sealing force applied makes abrasion be preferably minimized.It addition,
In the illustrated embodiment, standard material is used.Experiment shows when pressure rises to 2000 bar, black box
Running is normal.
In alternate embodiments 46, it is provided that a kind of sealing core 48 (Fig. 5).Before sealing core 48 is provided with
O 50 and rear O 52.As it was noted above, in piston embodiment 46, core 48 uses and is arranged on
The O 50 of the piston side of core 48 is sealed to piston 54.For rear O 52, its function and institute above
State similar.
It is to be appreciated that the size be given in above-described embodiment is merely for diagram purpose, can be in a similar manner
Use other size.The material type that each parts are used also is such.
The invention is not limited in the preferred embodiment of foregoing description.Appended claims defines institute of the present invention
The every right required, in scope of the presently claimed invention, can implement various amendment to the present invention.
Claims (14)
1. for sealing a black box for piston or plunger, including:
-sealing the core that is placed in chamber, the most described piston or plunger are transported relative to described chamber
Dynamic；
-front sealing device, is entering stroke and in discharge or compression stroke, and described front sealing device is described
Seal and seal between core and described chamber；With
-rear sealing device, is entering stroke and in discharge or compression stroke, and described rear sealing device is described
Sealing and seal between core and described piston or plunger, the most described sealing core is relative to described
Chamber movement, thus obtain sealing force, and
In discharge or compression stroke, described front sealing device is pushed against described sealing core by the pressure in cylinder body
With described piston or plunger, so that the power of described front sealing device outwards guides, and described sealing core is against institute
The sealing force stating piston or plunger increases along with the increase of cylinder interior pressure.
2. black box as claimed in claim 1, it is characterised in that described sealing core is arranged on fluid cylinder
In the chamber of head.
3. black box as claimed in claim 1 or 2, it is characterised in that described sealing core includes polymerization
Thing material.
4. black box as claimed in claim 3, it is characterised in that described polymeric material is supra polymer
Weight northylen.
5. black box as claimed in claim 1 or 2, it is characterised in that described sealing core is provided with holes
Opening, in piston or plunger are arranged on described opening the most in use, and the size in wherein said hole compares institute
The size stating piston or plunger is little.
6. black box as claimed in claim 1 or 2, it is characterised in that the outside dimension of described sealing core
Size less than described chamber.
7. black box as claimed in claim 5, it is characterised in that the outside dimension of described sealing core is more than
The size of described chamber, and the size in described hole is more than described piston or the size of plunger.
8. black box as claimed in claim 1 or 2, it is characterised in that make described sealing core in use
Material be stressed.
9. black box as claimed in claim 1 or 2, it is characterised in that seal dress after the most described
Put the supporting zone being sealed against main body.
10. black box as claimed in claim 9, it is characterised in that the most described front sealing device
With in the groove that rear sealing device is arranged on described sealing core, described groove is slightly less than the rear sealing dress compressed
Put.
11. black boies as claimed in claim 9, it is characterised in that supporting zone is less than described sealed core
The front region in portion.
12. black boies as claimed in claim 10, it is characterised in that supporting zone is less than described sealed core
The front region in portion.
The device of 13. 1 kinds of black boies being provided with as according to any one of claim 1-12.
14. 1 kinds of encapsulating methods, including the step of the black box provided as according to any one of claim 1-12
Suddenly.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2005057A NL2005057C2 (en) | 2010-07-08 | 2010-07-08 | Sealing assembly, device provided with such assembly and method for sealing. |
| NL2005057 | 2010-07-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102374292A CN102374292A (en) | 2012-03-14 |
| CN102374292B true CN102374292B (en) | 2016-08-17 |
Family
ID=43598529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110259521.5A Active CN102374292B (en) | 2010-07-08 | 2011-07-08 | Black box, with the device of this black box and encapsulating method |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN102374292B (en) |
| DE (1) | DE102011106920A1 (en) |
| NL (1) | NL2005057C2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013203902A1 (en) * | 2013-03-07 | 2014-09-11 | Robert Bosch Gmbh | Pump, in particular fuel pump |
| GB2540307B (en) | 2014-03-31 | 2020-08-19 | Agilent Technologies Inc | Sealing moving with piston in a high-pressure pump |
| FR3067071B1 (en) * | 2017-06-06 | 2019-07-19 | Vianney Rabhi | HYDRAULIC PISTON WITH VALVE COOLING AND LUBRICATION JOINT |
| FR3070731B1 (en) * | 2017-09-05 | 2019-09-06 | Vianney Rabhi | HYDRAULIC PISTON WITH COOLING VALVE AND LUBRICATION |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2293215A (en) * | 1994-08-19 | 1996-03-20 | Walker & Co James | Shaft seal |
| US6139021A (en) * | 1998-01-13 | 2000-10-31 | Daimlerchrysler Ag | Seal |
| CN1285301A (en) * | 2000-09-29 | 2001-02-28 | 成都明达船用密封有限公司 | Oil lubricating seal device for ship tail shaft |
| CN1732348A (en) * | 2002-11-22 | 2006-02-08 | 迪奥尼克斯公司 | Seal for high-pressure pumping system |
| EP1798455A1 (en) * | 2004-10-08 | 2007-06-20 | Nippon Pillar Packing Co., Ltd. | Static pressure type non-contact gas seal |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1584576A (en) * | 1976-07-14 | 1978-01-19 | Fotopoulos J | Seal |
| DE3026877C2 (en) * | 1980-07-16 | 1983-06-09 | Herbert Hänchen KG, 7302 Ostfildern | Low friction seal |
| DE3814571C1 (en) * | 1988-04-29 | 1989-07-06 | Kloeckner Ferromatik Desma Gmbh, 7831 Malterdingen, De | |
| DE4039173A1 (en) * | 1990-12-05 | 1992-06-11 | Mannesmann Ag | Piston rod seal - is free to move with piston rod, and has support incorporated in cylinder head |
| DE4223671A1 (en) * | 1992-07-17 | 1994-01-20 | Busak & Luyken Gmbh & Co | Sealing arrangement |
-
2010
- 2010-07-08 NL NL2005057A patent/NL2005057C2/en active
-
2011
- 2011-07-08 DE DE102011106920A patent/DE102011106920A1/en active Pending
- 2011-07-08 CN CN201110259521.5A patent/CN102374292B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2293215A (en) * | 1994-08-19 | 1996-03-20 | Walker & Co James | Shaft seal |
| US6139021A (en) * | 1998-01-13 | 2000-10-31 | Daimlerchrysler Ag | Seal |
| CN1285301A (en) * | 2000-09-29 | 2001-02-28 | 成都明达船用密封有限公司 | Oil lubricating seal device for ship tail shaft |
| CN1732348A (en) * | 2002-11-22 | 2006-02-08 | 迪奥尼克斯公司 | Seal for high-pressure pumping system |
| EP1798455A1 (en) * | 2004-10-08 | 2007-06-20 | Nippon Pillar Packing Co., Ltd. | Static pressure type non-contact gas seal |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102011106920A1 (en) | 2012-01-12 |
| NL2005057C2 (en) | 2012-01-10 |
| CN102374292A (en) | 2012-03-14 |
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