CN106832696B - A kind of modified polytetrafluoroethylcomposite composite material and preparation method thereof and a kind of sealing system - Google Patents
A kind of modified polytetrafluoroethylcomposite composite material and preparation method thereof and a kind of sealing system Download PDFInfo
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- CN106832696B CN106832696B CN201710105123.5A CN201710105123A CN106832696B CN 106832696 B CN106832696 B CN 106832696B CN 201710105123 A CN201710105123 A CN 201710105123A CN 106832696 B CN106832696 B CN 106832696B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Sealing Material Composition (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
The present invention provides a kind of oil sealing sealing systems, including axle sleeve (2) and axle envelope, the sealing system includes at least one set of sealing lip and O-ring, the sealing lip is located at outside the axle sleeve, the sealing lip inner surface is provided with the first reflux screw thread, the sleeve outer surface is provided with the second reflux screw thread matched with the first reflux screw thread, and the material of the sealing lip is modified polytetrafluoroethylcomposite composite material described in above-mentioned technical proposal.In the present invention, modified polytetrafluoroethylcomposite composite material sealing lip and axle sleeve cooperation have the effect of body-sealing interior oil, and the oil pump of leakage can be drawn onto the effect inside machine by the first reflux screw thread (3) on sealing lip and the second reflux screw thread (1) on axle sleeve；The oil of blowback simultaneously makes the contact site of lip and axis form lubricating oil film, reduces lip abrasion, extends the service life of oil sealing.Sealing system provided by the invention has good sealing effect, and leakage efficiency is high.
Description
Technical field
The present invention relates to mechanical equipment oil seal technique field more particularly to a kind of modified polytetrafluoroethylcomposite composite material and its
Preparation method and a kind of sealing system.
Background technique
In the industrial production, oil sealing is a kind of very widely used sealing means, is largely used to slewing and its auxiliary
Equipment is helped, to obstruct the leakage of lubricating oil or other working medias.Currently, sealing lip premature aging and sealing element oil sealing low efficiency
It is commonplace failure mode, is to need two main problems urgently to be resolved.
Since polytetrafluoroethylene material has preferably weatherability, rub resistance, resistance to compared to the rubber material that uses of tradition
The resistance to high bounce of burn into, anti-eccentric, high linear speed many one's best qualities, therefore polytetrafluoroethyloil oil seals come into being.By this
Although technology solves the problems, such as sealing lip premature aging, but since teflon seal lip radial force is excessive, so that close
The frictional force sealed between lip and rotary shaft is excessive, easily causes lubricating oil premature deterioration, and abrasion of the polytetrafluoroethylene (PTFE) lips to axis
Seriously, to cause leakage efficiency not high.
In the prior art, it solves the problems, such as that leakage efficiency is low mainly to start with from the structure of sealing element.In its structure side
Face, there are more design schemes: such as without the sealing lip of oil drive back thread, but being also disadvantageous: easy to leak；Sealing ring is with compacting
At the sealing lip of oil drive back thread, there is also disadvantages: being only applicable to single direction rotation, oil return limited efficacy；Though the sealing lip of other structures
So also using different shape, the spiral oil return line of different number, but all it is to suppress oil drive back thread on sealing lip, can not substantially changes
Kind oil return efficiency.
Summary of the invention
The purpose of the present invention is to provide a kind of modified polytetrafluoroethylcomposite composite materials, and using the composite material as close
The sealing system of lip is sealed, sealing system provided by the invention solves sealing lip of the existing technology to axle sleeve serious wear
Problem improves leakage efficiency.
The present invention provides a kind of modified polytetrafluoroethylcomposite composite materials, including following components:
The polytetrafluoroethylene (PTFE) of 70wt%~80wt%；
The molybdenum disulfide of 5wt%~10wt%；
The glass fibre of 5wt%~20wt%；
The graphite of 5wt%~10wt%.
25~30 μm of size of preferred polytetrafluoroethylene (PTFE)；
3~5 μm of size of preferred molybdenum disulfide；
30~50 μm of diameter of preferred glass fibre, draw ratio 3:1~5:1；
5~10 μm of size of preferred graphite.
Preferably, including following components:
The polytetrafluoroethylene (PTFE) of 73wt%；
The molybdenum disulfide of 7wt%；
The glass fibre of 12wt%；
The graphite of 8wt%.
The present invention provides the preparation methods of composite material described in above-mentioned technical proposal, comprising the following steps:
After material freeze-drying water removal, respectively by the screen to filtrate, it is mixed that high speed is added according to the material composition of claim 3
Material machine is uniformly mixed, and mold is added after mixing and suppresses embryo material, high temperature sintering obtains composite material.
The present invention also provides a kind of oil sealing sealing system, including axle sleeve (2) and axle envelope, the axle envelope includes at least one
Group sealing lip and O-ring, the sealing lip are located at outside the axle sleeve, which is characterized in that the sealing lip inner surface is provided with the
One reflux screw thread, the sleeve outer surface is provided with the second reflux screw thread matched with the first reflux screw thread, described close
The material for sealing lip is preparation method described in modified polytetrafluoroethylcomposite composite material described in above-mentioned technical proposal or above-mentioned technical proposal
Obtained modified polytetrafluoroethylcomposite composite material.
Preferably, in the axle envelope, it is provided with way valve passageway between one group of sealing lip, is set in the way valve passageway
It is equipped with check valve, the check valve will be inside the oily suck-back to machine of leakage.
Preferably, the screw pitch of the first reflux screw thread and the second reflux screw thread independently is 0.1~0.5mm；Every is returned
The vertical depth of stream screw thread independently is 0.05mm~0.15mm.
Preferably, the screw thread of the second reflux screw thread is independently made of a plurality of parallel lines, the surface matter of screw thread
Measuring Ra is 0.2 μm~0.63 μm, and Rmax is 1 μm~4 μm, 58 degree of Rockwell hardness or more.
Preferably, the quantity of reflux screw thread is 5~10 on each sealing lip, the first reflux screw thread and contact surface
Angle be 30 °~45 °.
Preferably, the sealing lip with a thickness of 0.5mm~1.0mm.
The present invention provides a kind of modified polytetrafluoroethylcomposite composite materials, including following components: 70wt%~80wt%'s
Polytetrafluoroethylene (PTFE)；The molybdenum disulfide of 5wt%~10wt%；The glass fibre of 5wt%~10wt%；The stone of 5wt%~10wt%
Ink.Composite material provided by the invention changes polytetrafluoroethylene (PTFE) using molybdenum disulfide, glass fibre and graphite as modifying agent
Property, the performances such as the acidproof, alkaline-resisting of polytetrafluoroethylene (PTFE), solvent resistant, chemical-resistant resistance are improved, there is excellent ageing-resistant, resistance to height
Cryogenic property, thermal stability with higher can be used for a long time within the scope of 240~260 DEG C, and have good self-lubricating
Performance reduces sealing lip and rotary shaft so that having excellent performance with the sealing lip that the composite material is prepared
Between frictional force, greatly reduce abrasion of the sealing lip to rotary shaft, improve leakage efficiency.
The present invention also provides a kind of oil sealing sealing systems, including axle sleeve (2) and axle envelope, the package to include at least one set
Sealing lip and O-ring, the sealing lip are set in outside the axle sleeve, and the sealing lip inner surface is provided with the first reflux screw thread,
The sleeve outer surface is provided with the second reflux screw thread matched with the first reflux screw thread, and the material of the sealing lip is
Modified polytetrafluoroethylcomposite composite material described in above-mentioned technical proposal.In the present invention, modified polytetrafluoroethylcomposite composite material seals
Lip and axle sleeve cooperation have the effect of body-sealing interior oil, and in the first reflux screw thread (3) and axle sleeve on sealing lip
The oil pump of leakage can be drawn onto the effect inside machine by the second reflux screw thread (1)；The oil of blowback simultaneously makes connecing for lip and axis
Contact portion position forms lubricating oil film, reduces lip abrasion, extends the service life of oil sealing.Sealing system tool provided by the invention
There is good sealing effect, leakage efficiency is high.
Further, it in the axle envelope, is provided between one group of sealing lip way valve passageway (5), the check valve is logical
It is provided with check valve in road, the oily suck-back of leakage can be returned to internal body, further improve sealing effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of sealing system provided in an embodiment of the present invention；
Fig. 2 is the preparation flow schematic diagram of axle envelope in the embodiment of the present invention；
Fig. 3 is the preparation flow schematic diagram of bottom bracket axle of the embodiment of the present invention；
Fig. 4 is sealing system of embodiment of the present invention abrasive effect test data；
Fig. 5 is the reflux transfer rate test result of reflux screw thread in sealing system of the embodiment of the present invention.
Specific embodiment
The present invention provides a kind of modified polytetrafluoroethylcomposite composite materials, including following components:
The polytetrafluoroethylene (PTFE) of 70wt%~80wt%；
The molybdenum disulfide of 5wt%~10wt%；
The glass fibre of 5wt%~20wt%；
The graphite of 5wt%~10wt%.
Modified polytetrafluoroethylcomposite composite material provided by the invention includes the polytetrafluoroethylene (PTFE) of 70wt%~80wt%, preferably
For 70wt%~75wt%, more preferably 73wt%.In the present invention, the granularity of the polytetrafluoroethylene (PTFE) is preferably 25~30 μ
M, more preferably 25 μm.The present invention does not have special limitation to the source of the polytetrafluoroethylene (PTFE), using those skilled in the art
The commercial goods of well known polytetrafluoroethylene (PTFE).
Modified polytetrafluoroethylcomposite composite material provided by the invention includes the molybdenum disulfide of 5wt%~10wt%, preferably
5wt%~8wt%, more preferably 7wt%.In the present invention, the granularity of the molybdenum disulfide is preferably 3~5 μm, more preferably
3μm.The present invention does not have special limitation to the source of the molybdenum disulfide, using above-mentioned technology well known to those skilled in the art
The commercial goods of molybdenum disulfide described in scheme.
Modified polytetrafluoroethylcomposite composite material provided by the invention includes the glass fibre of 5wt%~20wt%, preferably
10wt%~20wt%, more preferably 12wt%.In the present invention, the diameter of the glass fibre is preferably 30~50 μm, more
Preferably 30~40 μm；The draw ratio of the glass fibre is preferably 3:1~5:1, more preferably draw ratio 3:1.The present invention couple
The source of the glass fibre does not have special limitation, using the glass fibers of above-mentioned technical parameter well known to those skilled in the art
The commercial goods of dimension.
Modified polytetrafluoroethylcomposite composite material provided by the invention includes the graphite of 5wt%~10wt%, preferably 5wt%
~8wt%, more preferably 8wt%.In the present invention, the granularity of the graphite is preferably 5~10 μm, and more preferably 5 μm.This hair
The bright source to the graphite does not have special limitation, and the commercial goods using above-mentioned graphite well known to those skilled in the art are
It can.
The present invention also provides the preparation methods of modified polytetrafluoroethylcomposite composite material described in above-mentioned technical proposal, including with
Lower step:
It will be mixed after the freeze-drying of component described in above-mentioned technical proposal, obtain mixed material；
The mixed material is suppressed in a mold, obtains blank；
The blank is sintered, composite material is obtained.
The raw material of component described in above-mentioned technical proposal is preferably freeze-dried by the present invention, and re-sieving obtains above-mentioned technical side
The component of granularity described in case.The present invention does not have special restriction to the method for the freeze-drying and the equipment used, using this
The technical solution being freeze-dried known to the technical staff of field.In the present invention, the temperature of the freeze-drying preferably -20
DEG C~-30 DEG C；The time of the freeze-drying is preferably 5~6h.
After raw material after being dried, the present invention mixes the dry feedstock, obtains mixed material.In the present invention,
The mixing is conducive to raw material and is uniformly mixed preferably in high speed mixer；The stirring rate when mixing is preferably 5000
~8000r/min, is more selected as 6000~7000r/min；The mixed time is preferably 1~2h.
After obtaining mixed material, the shape of present invention product as needed selects suitable mold, by the mixture
Material, which is placed in mold, to be suppressed, and blank is obtained.In the present invention, the mold is the mold for preparing sealing lip.In the present invention, institute
Pressure when stating compacting is preferably 35~50MPa.
After obtaining blank, the blank is sintered by the present invention, obtains composite material；When the mold is to prepare sealing lip
When mold, what is obtained is sealing lip finished product.In the present invention, the temperature of the sintering is preferably 380 DEG C；The time of the sintering
Preferably 12~15h, more preferably 13~14h.The present invention is not particularly limited the agglomerating plant, using art technology
High temperature sintering furnace known to personnel.
The present invention also provides a kind of oil sealing sealing system, including axle sleeve and axle envelope, the axle envelope includes at least one set
Sealing lip and O-ring, the sealing lip are located at outside the axle sleeve, and the sealing lip inner surface is provided with the first reflux screw thread, institute
It states sleeve outer surface and is provided with the second reflux screw thread matched with the first reflux screw thread, the material of the sealing lip is upper
State the modification poly- four that preparation method described in modified polytetrafluoroethylcomposite composite material or above-mentioned technical proposal described in technical solution obtains
Fluoride composite material.
As shown in FIG. 1, FIG. 1 is the structural schematic diagrams for the sealing system that the present invention implements to provide, wherein 1 is the second reflux spiral shell
Line, 2 be axle sleeve, and 3 be the first reflux screw thread, and 4 be sealing lip, and 5 be check valve, and 6 be O-ring, and 7 be unidirectional return flow line.
Sealing system provided by the invention includes axle envelope, and the axle envelope includes at least one set of sealing lip and O-ring, the O
Type snare is located in metal shell groove against sealing lip, guarantees No leakage at sealing lip pressing.The material for sealing lip is above-mentioned skill
Modified Teflon described in art scheme.
In the present invention, the inner surface of the sealing lip is provided with the first reflux screw thread, will reveal with axle sleeve cooperation
Oil pump be sucked back into inside machine.In an embodiment of the present invention, the screw pitch of the first reflux screw thread is 0.1mm~0.5mm；
In a part of the embodiments of the present invention, the screw pitch of the first reflux screw thread can be specially 0.1mm.In the embodiment of the present invention
In, the vertical depth of every reflux screw thread is 0.05mm~0.15mm；In a part of the embodiments of the present invention, every reflux spiral shell
The vertical depth of line can be specially 0.1mm.
In an embodiment of the present invention, the angle of the first reflux screw thread and contact surface is 30 °~45 °；In the present invention
Section Example in, the angle can be specially 30 °.In the present invention, the quantity of screw thread of flowing back on each sealing lip can be with
It is 5~10, in a particular embodiment, the quantity of the reflux screw thread can be specially 5.
In the present invention, the thickness of the sealing lip is preferably 0.5mm~1.0mm；In an embodiment of the present invention, described
The thickness of sealing lip can be specially 0.5mm.
In the present invention, the preparation method of the sealing lip preferably includes following steps:
Sintered product is obtained according to the preparation method of composite material described in above-mentioned technical proposal；The sintered product is carried out
Machining, obtains threaded sealing lip.In the present invention, by the machining, in the inner surface of the sealing lip
Form the screw thread that flows back described in above-mentioned technical proposal.
Sealing system provided by the invention includes axle sleeve, and the sealing lip is set in the sleeve outer surface.In the present invention
In, the sleeve outer surface is provided with the second reflux screw thread matched with the first reflux screw thread, so as to reveal
Oil pump suck back in machine, improve sealing effect.In the present invention, it is described second reflux screw thread screw pitch be 0.1mm~
0.5mm；In a part of the embodiments of the present invention, the screw pitch of the second reflux screw thread can be specially 0.1mm.Of the invention
In embodiment, the vertical depth of every reflux screw thread is 0.05mm~0.15mm；In a part of the embodiments of the present invention, every
The vertical depth of reflux screw thread can be specially 0.05mm.
In the present invention, the second reflux screw thread is made of a plurality of parallel lines, the surface matter of the second reflux screw thread
Measuring Ra is 0.2 μm~0.63 μm, and Rmax is 1 μm~4 μm, 58 ° of Rockwell hardness or more, preferably no greater than 70 °.In reality of the invention
It applies in example, the surface quality Ra of the second reflux screw thread can be specially 0.4.
In the present invention, the material surface polishing post-processing screw thread after the axle sleeve is quenched by stainless steel material obtains
It arrives.The smoothness Ra on the polishing material surface is 0.4 μm.
Sealing system provided by the invention includes axle envelope, in the axle envelope, is provided with check valve between one group of sealing lip
Channel, check valve are located in metal shell, and channel internal diameter is not more than 1mm, is provided with check valve in the way valve passageway, described
Check valve returns to the oil of leakage inside machine by body negative pressure suck-back.
In the present invention, the material of the axle envelope is preferably hard steel, can be specially 102Cr6.In the present invention, institute
The preparation method for stating axle sleeve preferably includes following steps:
Hard steel raw material is quenched；
Material surface after the quenching treatment is polished into post-processing screw thread, obtains axle sleeve.
In the present invention, the smoothness Ra on polishing material surface is 0.4 μm.
In order to further illustrate the present invention, technical solution provided by the invention is retouched in detail below with reference to embodiment
It states, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
By the polytetrafluoroethylene (PTFE) of 73g (or kg), the glass fibre of 12g (or kg), the molybdenum disulfide of 7g (or kg) and 8g (or
Kg frozen drying 1h time under the conditions of -25 DEG C of graphite) is added to three-dimensional material mixer high speed and is uniformly mixed, mixing
Condition 6000r/min, obtain mixed material；
Obtained mixed material is added in semi-finished product mold, embryo material is pressed under the pressure of 45MPa, embryo material is existed
The high temperature sintering 12h time obtains semi-finished product at 380 DEG C；
It is machined into reflux screw thread in the inner surface of semi-finished product, the vertical depth 0.1mm for the screw thread that flows back.
The installation grain of mounting groove and check valve in stainless steel metal shell with O-ring.By sealing lip, O-ring, unidirectional
Valve and metal shell are pressed into axle envelope after fitting together.Axle envelope is finally shaped to the shape of needs.
102Cr6 stainless steel bushing is quenched, surface is then ground to model of the Ra at 0.2 μm~0.63 μm with grinding machine
It encloses, spiral lamination is finally added to surface by the fixed sand paper of axle sleeve or lathe.
Embodiment 2
By the polytetrafluoroethylene (PTFE) of 70g (or kg), the glass fibre of 15g (or kg), 5g (or kg) molybdenum disulfide and 10g
The graphite of (or kg) frozen drying 1h time under the conditions of -25 DEG C is added to three-dimensional material mixer high speed and is uniformly mixed, mixes
The condition 6000r/min of conjunction, obtains mixed material；
Obtained mixed material is added in sealing lip mold, embryo material is pressed under the pressure of 45MPa, embryo material is existed
The high temperature sintering 12h time obtains semi-finished product at 380 DEG C；
It is machined into reflux screw thread in the inner surface of semi-finished product, the vertical depth 0.05mm for the screw thread that flows back.
The installation grain of mounting groove and check valve in stainless steel metal shell with O-ring.By sealing lip, O-ring, unidirectional
Valve and metal shell are pressed into axle envelope after fitting together.Axle envelope is finally shaped to the shape of needs.
102Cr6 stainless steel bushing is quenched, surface is then ground to model of the Ra at 0.2 μm~0.63 μm with grinding machine
It encloses, spiral lamination is finally added to surface by the fixed sand paper of axle sleeve or lathe.
Performance test
The Mechanics Performance Testing of 1.1 sealing materials
The present invention is tested according to performance of the method in EN ISO 12086 to sealing material, and the results are shown in Table 1.
The mechanical experimental results of sealing material in 1 embodiment of the present invention of table
It can be seen that material longitudinal tensile strength is higher than standard requirements 13.0N/mm in table 12, transverse tensile strength, which is higher than, to be marked
Alignment request 16.0N/mm2.It is higher than standard 200% in terms of longitudinal elongation percentage, is laterally extended rate higher than standard 225%.
The polishing machine of 1.2 sealing materials
Also to sealing system, prolonged abrasion condition is tested the present invention under the conditions of dry operating (oil-free), is tested
Condition is as follows:
Test gas: air
Temperature: 100 DEG C；
Rate: 4m/s
Pressure: 0.42N/mm2
Mean depth: 2 μm
Testing time: 100 hours
Test results are shown in figure 4, and the wear-resisting property of different packing materials is tested under above-mentioned equal conditions, passes through
It is best in terms of material wear-resistant performance that data can be seen that the formula of embodiment 1.
The reflux transfer rate of reflux screw thread in 2.1 present invention test return-flow systems
Oil sealing size: 65 × 85 × 8mm
Sealing lip mixture: embodiment 1 is formulated
Seal lip thickness: 1.0mm
Oil mass: the above 20mm in axis bottom edge
Oil number: shell MYRINA 15W 20
Oil temperature: 80 DEG C
The duration of runs: 30 minutes
Spiral lamination on sealing lip: depth 0.05mm
Spiral lamination on axle sleeve: Rz=3 μm of depth, 10 ° of spiral angle
As a result as shown in figure 5, left side cylindricality is the reflux transfer rate of spiral lamination on sealing lip in figure, right hand column is axle sleeve
The reflux transfer rate of lira, as seen from Figure 5, sealing system provided by the invention be conducive to oil reflux, and with turn
The increase of speed, reflux transfer rate have different degrees of increase.
2.2, working limit:
The present invention is tested the working limit of sealing system, as a result as follows:
Largest circumference speed: 20m/s
Temperature range: -60 DEG C to+200 DEG C
Maximum pressure: 10bar
Vacuum pressure: 10-4bar
Concentric offset amount :≤0.1mm
Concentricity tolerance :≤0.05mm.
2.3, service life
The service life of open market product exists in 5000~8000h, sealing system service life provided by the invention
15000~20000h is primarily due to material abrasion resistance properties with higher.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of modified polytetrafluoroethylcomposite composite material, composed of the following components:
The polytetrafluoroethylene (PTFE) of 70wt%-80wt%；
The molybdenum disulfide of 5wt%-10wt%；
The glass fibre of 5wt%~20wt%；
The graphite of 5wt%~10wt%；
The granularity of the molybdenum disulfide is 3~5 μm.
2. composite material according to claim 1, which is characterized in that the granularity of the polytetrafluoroethylene (PTFE) is 25~30 μm；
The surface coverage of the molybdenum disulfide is 5~10m2/kg；
The diameter of the glass fibre is 30~50 μm, and draw ratio is 3:1~5:1；
The granularity of the graphite is 5~10 μm.
3. composite material according to claim 1 or 2, which is characterized in that including following components:
The polytetrafluoroethylene (PTFE) of 73wt%；
The molybdenum disulfide of 7wt%；
The glass fibre of 12wt%；
The graphite of 8wt%.
4. the preparation method of composite material described in claims 1 to 3 any one, comprising the following steps:
It is mixed after raw material is freeze-dried, obtains mixed material；
The mixed material is suppressed in a mold, obtains blank；
The blank is sintered, composite material is obtained.
5. the preparation method according to claim 4, which is characterized in that the temperature of the sintering is preferably 380 DEG C；The burning
The time of knot is preferably 12~15h.
6. a kind of oil sealing sealing system, including axle sleeve and axle envelope, the axle envelope includes at least one set of sealing lip and O-ring, institute
It states sealing lip to be located at outside the axle sleeve, which is characterized in that the sealing lip inner surface is provided with the first reflux screw thread, the axle sleeve
Outer surface is provided with the second reflux screw thread matched with the first reflux screw thread, and the material of the sealing lip is claim
Preparation method described in modified polytetrafluoroethylcomposite composite material described in 1~3 any one or claim 4~5 any one obtains
Modified polytetrafluoroethylcomposite composite material.
7. sealing system according to claim 6, which is characterized in that in the axle envelope, be arranged between one group of sealing lip
There is way valve passageway, check valve is provided in the way valve passageway, the check valve bears the oil of leakage by internal body
It overwhelms and is sucked back into inside machine.
8. sealing system according to claim 6 or 7, which is characterized in that the first reflux screw thread and the second reflux spiral shell
The screw pitch of line independently is 0.1mm~0.5mm；The vertical depth of every reflux screw thread independently is 0.05mm~0.15mm.
9. sealing system according to claim 8, which is characterized in that the second reflux screw thread is by a plurality of parallel lines
Composition, the surface quality Ra of screw thread are 0.2 μm~0.63 μm, and Rmax is 1 μm~4 μm, 58 degree of Rockwell hardness or more.
10. sealing system according to claim 6, which is characterized in that on each sealing lip flow back screw thread quantity be 5~
10, the first reflux screw thread and the angle of contact surface are 30 °~45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710105123.5A CN106832696B (en) | 2017-02-25 | 2017-02-25 | A kind of modified polytetrafluoroethylcomposite composite material and preparation method thereof and a kind of sealing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710105123.5A CN106832696B (en) | 2017-02-25 | 2017-02-25 | A kind of modified polytetrafluoroethylcomposite composite material and preparation method thereof and a kind of sealing system |
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| CN112696495B (en) * | 2019-10-22 | 2022-11-04 | 湖北亿钧耀能新材股份公司 | Guiding mechanism with dynamic seal and using method thereof |
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| CN87100190A (en) * | 1987-01-08 | 1988-07-20 | 王必柱 | Automobile mating parts of teflon mixed products |
| CN1071179A (en) * | 1991-09-29 | 1993-04-21 | 中国人民解放军工程兵工程学院 | Carbon-fibre reinforced polytetrafluorethylesealing sealing material and preparation method thereof |
| CN1262620C (en) * | 2002-06-11 | 2006-07-05 | 上海上化氟材料有限公司 | Stuffing perfluoroethylene material for oil sealing element and process for preparing the same |
| CN2675968Y (en) * | 2004-02-16 | 2005-02-02 | 青岛基珀密封工业有限公司 | Engine crankshaft oil seal |
| CN104558986A (en) * | 2014-12-28 | 2015-04-29 | 贵州祥宇泵阀制造有限公司 | Modified PTFE and preparation method thereof |
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