CN1035130C - Self balance combined high pressure rotary sealing ring - Google Patents
Self balance combined high pressure rotary sealing ring Download PDFInfo
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- CN1035130C CN1035130C CN93120025A CN93120025A CN1035130C CN 1035130 C CN1035130 C CN 1035130C CN 93120025 A CN93120025 A CN 93120025A CN 93120025 A CN93120025 A CN 93120025A CN 1035130 C CN1035130 C CN 1035130C
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- high pressure
- sealing ring
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Abstract
The present invention relates to a self balance combined high pressure rotary sealing ring used for a high speed rotary axle, which comprises a sealing cup made by filling polytetrafluoroethylene, and an O-shaped ring which is made of rubber or polyamine ester and arranged in the sealing cup. The sealing cup is provided with a lip-shaped opening in which a circular cavity of the O-shaped ring is installed. A cross section of the sealing cup is provided with a first edge, a second edge, a third edge, a fourth edge, a back pressure edge, a sealing edge and a bevel edge. The sealing ring of the present invention can be used in high pressure and high speed work occasions, and has the advantages of small friction force and long service life.
Description
The present invention relates to a kind of shaft seal that is used to rotate, particularly a kind of self balance combined high pressure rotary sealing ring that is used for high rotating speed running shaft.
In modern mechanical industry, seal element is one of most widely used base components, for rotary seal, because its special application, it should have less friction factor, long working life, and should be able to satisfy normal workpiece under the high-revolving condition of high pressure and do not leak.Rotary seal of the prior art mainly contains following several:
(1) filling type sealing.As domain packing seal and packing filling sealing.Pressure Applicable scope: 1.3 * 10
3Pa-3.5 * 10
7Pa; Linear velocity is less than 20m/s, and shortcoming is: linear velocity was low when pressure was high; Frictional force is big; Leakage is arranged during parking.
(2) extrusion pressing type sealing.As the O type, D, X, the sealing of Δ type etc., it is 3.5 * 10
7Under the Pa pressure, roulette speed is less than 0.05m/s; 0.7 * 10
6Under the Pa pressure, roulette speed can reach 3m/s.
(3) divide the type that cuts open to seal.As trip ring and resolution ring.It is withstand voltage and roulette speed can very high (1.5 * 10
7Pa-2.2 * 10
8Pa; 3m/s-100m/s), but it belongs to leakage type sealing.That is to say that it all has leakage at rotation status and vehicle stop state, both polluted environment, also reduced efficient.
(4) flexural mode sealing.As oil sealings such as V-type, U type, Y type in the lip seal.This class rotary seal is widely used in all kinds of rotating machineries.Its sealing load reaches as high as 10 * 10
7Pa, but maximum shortcoming is that roulette speed is low, and sealing has only the linear velocity of 30-35mm/s as the U type.When oil sealing was worked in roulette speed 4-15m/s scope, withstand voltage had only 3-0.7 * 10
5Pa.
Fig. 1 a, 1b and 1c show the structure of three kinds of different lip seal respectively, in Fig. 1 a, seal ring mainly is made up of rubber bowl part 21 and 22 liang of big parts of spring shackle, its sealing mechanism is to add that by the interference fit pressure of the lip end 25 self of rubber bowl part 21 and the power of encircling of spring ring 22 working medium pressure P sum forms the contact pressure on oil sealing lip end and running shaft surface, and control oil slick thickness, thereby reach the purpose of sealing by this pressure.But, because the waist 24 on the existing seal ring is thiner and pressure medium P is had an annular active area of a broad, and material mostly adopts elastic caoutchouc, thereby when working medium pressure P raises, make it to produce bending deflection, seriously destroyed sealing mechanism, owing to wearing and tearing or tear and make seal failure and produce leakage.For improve working pressure existing sealing adopted the measure of strengthening waist 24 see metal frame 23 and 23 among Fig. 1 b and the 1c '.However its working pressure is only by 3.5 * 10 of pattern shown in Fig. 1 a
5Pa brings up to 7 * 10 of pattern shown in Fig. 1 b
5Pa can only improve 3.5 * 10 of pattern shown in Fig. 1 c at last
6Pa.
One object of the present invention is to overcome defective of the prior art, provide a kind of can be under high rotating speed the self balance combined high pressure rotary sealing ring of proper functioning.
It is little that another object of the present invention provides a kind of friction factor, long service life and leak free self balance combined high pressure rotary sealing ring.
Another purpose of the present invention provides wide, rational in infrastructure, the easy to process and lower-cost self balance combined high pressure rotary sealing ring of a kind of Applicable temperature scope.
Technical solution of the present invention is as follows: a kind of self balance combined high pressure rotary sealing ring, comprise that a seal bowl and is contained in the O shape circle in the seal bowl, it is characterized in that: described seal bowl has a lip opening, the cross section of seal bowl has one first limit, second limit, the 3rd limit, the 4th limit, the back pressure limit, sealing strip, bevel edge and lip opening, described second limit and static part join, first limit and the 3rd limit all meet at right angles with second limit, described sealing strip and running shaft form sliding contact, the back pressure limit couples together the 3rd limit and sealing strip, and the back pressure limit becomes a less angle A with the running shaft axial surface, described less angle A is in the scope of 0 °＜A≤15 °, described lip opening is between first limit and the 4th limit, bevel edge couples together the 4th limit with sealing strip and bevel edge becomes a bigger angle B with the running shaft axial surface, and described bigger angle B is in the scope of 20 °≤B≤80 °.The centre of the seal bowl in the described lip opening is provided with a round chamber, and the center line perpendicular to the running shaft surface of this round chamber is positioned at the scope of sealing strip, and described O shape circle is assemblied in for interference in the round chamber of circular open of lip opening.Described angle A is approximately equal to 5 °, and angle B is approximately equal to 45 °.Described seal bowl is made by the filling polytetrafluoroethylene, and described O shape circle is by the rubber material manufacturing.Described O shape circle is by nitrile butadiene rubber or silicone rubber or polyurethane manufacturing.The described filler that is used to make the filling polytetrafluoroethylene of seal bowl is molybdenum disulfide and copper powder.Described filler molybdenum disulfide is in the scope of 0.1%-3% (wt), and copper powder is in the 35%-65% scope.
The present invention is compared with prior art, and is applied widely, can satisfy simultaneously rotary seal high pressure, high-revolving usage requirement, and be 2.5 * 10 at oil pressure pressure
7During Pa, the linear velocity of running shaft can be greater than 3m/s, and does not leak.The Applicable temperature scope is big simultaneously, can both proper functioning in-40 ℃-+90 ℃ scope.Owing to adopt filling polytetrafluoroethylene material (molybdenum disulfide and copper powder are arranged in the filler), both improved working life, also reduced the friction factor of seal ring.And processing and install all very convenient.
With reference to the accompanying drawings most preferred embodiment of the present invention is further described.
Fig. 1 a, 1b are the cross section cut-away view of three kinds of different structural types of lip seal ring in the prior art with 1c;
Fig. 2 a, 2b and 2c are the cross section cut-away view of self balance combined high pressure rotary sealing ring of the present invention, and Fig. 2 a, 2b and 2c have represented to take place along with pressure rising O shape circle 20 situation of compressive deformation successively;
Fig. 3 is that rotary seal of the present invention is used for the schematic representation on the running shaft 32;
Fig. 4 is the schematic representation that the position of the bevel edge 6 of rotating seal ring of the present invention changes;
Among the figure: first limit 1 of seal bowl; Second limit 2; The 3rd limit 3; The 4th limit 4; The lip opening 5 of seal ring; Bevel edge 6,6a, 6b; Round chamber 7 in the seal bowl; The center line 8 of round chamber; Seal bowl 10; Self balance combined high pressure rotary sealing ring 11; The width 12 of sealing strip; Sealing back pressure cavity 14; The junction plane 16 of seal ring and grommet (comprising second limit 2 and the 3rd limit 3); Grommet 17; The center of circle 19 of round chamber in the seal bowl; O shape circle 20; Rubber bowl 21; Spring shackle 22; Metal frame 23,23 '; The waist 24 of rubber bowl; Sealing lip end 25; O shape circle texturing zone 30; Sealing strip width index line 31; Running shaft 32; Back pressure limit 40; Sealing strip 50.
Referring to accompanying drawing 2 and 3, Fig. 2 b particularly there is shown cross-section structure (part) schematic representation of self balance combined high pressure rotary sealing ring of the present invention.Sealing ring 11 comprises that seal bowl 10 and O shape are enclosed 20 two-part, and seal bowl 20 has one first limit 1, second limit 2, the 3rd limit 3, the 4th limit 4, lip opening 5, bevel edge 6, round chamber 7, back pressure limit 40 and sealing strip 50.There are not waist and sealing lip end (being outer soft interior hard in the prior art) on the General Purpose Rubber bowl on the sealing bowl 10, but according to pressure balanced principle, adopt seal bowl to add the form (outer hard interior soft) of O shape circle, and design has bevel edge 6 that pressure oil P is introduced below the 4th limit 4, thereby the active force that radially makes progress along running shaft that makes that pressure oil P produces on bevel edge 6, with offset pressure oil P act on produce on the lip opening internal surface to the major part of radially downward active force.The included angle A of back pressure limit 40 and the straight line of running shaft axial surface in the scope of 0 °＜A≤15 °, the scope of the included angle B of bevel edge 6 and running shaft axial surface straight line in 25 °≤B≤80 ° with.Generally getting angle A is about 5 °, and angle B is about 45 °.Described second limit be parallel to axial surface and around running shaft 32, the first limits 1, the 3rd limit 3 and the 4th limit 4 all perpendicular to the running shaft surface.Round chamber 7 in the seal bowl 10 is used to install O shape circle 20, the position of its center line, particularly be positioned at the scope of sealing strip perpendicular to the position of the center line 8 on running shaft surface, this center line 8 should be positioned at the width 12 of sealing strip 50, in the present embodiment, this center line 8 passes the binding site of bevel edge and sealing strip basically.
What the seal bowl 10 among the present invention adopted is filling polytetrafluoroethylene material, its filler is molybdenum disulfide and copper powder, wherein molybdenum disulfide accounts for about 0.1%-3% (wt), copper powder accounts for about 35%-65% (wt), all the other are polytetrafluoroethylene, so the sealing bowl has high strength, high wear resistance, good thermal conductivity and very low friction factor.Interference is installed in 20 employing rubber (can adopt nitrile butadiene rubber, fluorine rubber or silicone rubber according to employed medium) of the elastic O-ring in the round chamber 7 or the manufacturing of polyamine fat in the seal bowl 10.
The sealing mechanism of seal ring of the present invention is (seeing Fig. 2 a, 2b and 2c): (Fig. 2 a) when working medium does not have pressure or pressure P low, sealing is to lean on the sealing strip of seal bowl 10 50 and the assembling interference power on axle surface and the radial interference power sum of elasticity O-ring seals 20 to reach the needed specific pressure of sealing, thereby plays seal action.When working medium pressure P raise gradually, elasticity O-ring seals 20 was in the active force lower compression distortion (seeing Fig. 2 b, 2c) of pressure P, and along with the rising of pressure P, amount of deformation 30 is also big more.Because acting on the radially downward active force of lip opening internal surface work is to be slightly larger than the active force that radially makes progress that produces on the bevel edge surface, promptly upper and lower pressure is in a basic balance.Like this, pressure P raises or reduces and can not produce the moment that makes the sealing strip distortion.Thereby remain the sound of its sealing mechanism, reach the purpose that high-voltage high-speed is realized sealing.This pressure balancing structure can make the specific pressure of whole sealing strip remain on one can to keep sealing and the optimum value of the excessive specific pressure value of unlikely generation.
Referring to Fig. 4, provide the position of the binding site K of three kinds of different sealing strips and bevel edge 6 among Fig. 4.K1 is the position in the most preferred embodiment of the present invention, its corresponding bevel edge 6.When adopting the K2 point, bevel edge is 6a, and it is big that this hour angle B becomes.When pressure P raises, because the area of contour of bevel edge 6a on the axle surface reduces, the radially downward active force that the active force that radially makes progress that is produced is not enough to contend with and produces on the lip opening internal surface, seal pressure increases, sealing is fine, the quickening but wear and tear when high rotating speed in sealing strip and running shaft surface, reduce sealing life.When adopting the K3 point, bevel edge is 6b, and this moment, the B angle diminished, situation is just in time opposite with the K2 point, bevel edge 6b increases in the lip-deep area of contour of axle, and after oil pressure P raise, the active force that radially makes progress that is produced was greater than the radially downward active force that produces on the lip opening internal surface.Seal pressure descends, poor sealing, even leak.Therefore the K1 point is for keeping the optimum of desirable specific pressure.According to the present invention, the center line 8 of round chamber in the seal bowl is dropped in the scope of sealing strip, according to most preferred embodiment of the present invention, this center line 8 is to overlap substantially with the K1 point.
Claims (5)
1, a kind of self balance combined high pressure rotary sealing ring, comprise that a seal bowl and is contained in the O shape circle in the seal bowl, it is characterized in that: described seal bowl has a lip opening, the cross section of seal bowl has one first limit, second limit, the 3rd limit, the 4th limit, the back pressure limit, sealing strip, bevel edge and lip opening, described second limit and static part join, first limit and the 3rd limit all meet at right angles with second limit, described sealing strip and running shaft form sliding contact, the back pressure limit couples together the 3rd limit and sealing strip, and the back pressure limit becomes a less angle A with the running shaft axial surface, i.e. 0 °＜A≤15 °, described lip opening is between first limit and the 4th limit, bevel edge couples together the 4th limit with sealing strip and bevel edge becomes a bigger angle B with the running shaft axial surface, in the scope of 20 °≤B≤80 °, the centre of the seal bowl in the described lip opening is provided with a round chamber, the center line perpendicular to the running shaft surface of this round chamber is positioned at the scope of sealing strip, and described O shape circle is assemblied in for interference in the round chamber of circular open of lip opening.
2, a kind of self balance combined high pressure rotary sealing ring as claimed in claim 1 is characterized in that: described angle A is approximately equal to 5 °, and angle B is approximately equal to 45 °.
3, a kind of self balance combined high pressure rotary sealing ring as claimed in claim 1 is characterized in that: described seal bowl is by the teflon manufacturing that is filled with molybdenum disulfide and copper powder, and described O shape circle is by the rubber material manufacturing.
4, a kind of self balance combined high pressure rotary sealing ring as claimed in claim 1 is characterized in that: described O shape circle is by nitrile butadiene rubber or silicone rubber or polyurethane manufacturing.
5, a kind of self balance combined high pressure rotary sealing ring as claimed in claim 3 is characterized in that: described filler molybdenum disulfide is in the scope of 0.1%-3% (wt), and copper powder is in the 35%-65% scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93120025A CN1035130C (en) | 1993-12-16 | 1993-12-16 | Self balance combined high pressure rotary sealing ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93120025A CN1035130C (en) | 1993-12-16 | 1993-12-16 | Self balance combined high pressure rotary sealing ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1090634A CN1090634A (en) | 1994-08-10 |
| CN1035130C true CN1035130C (en) | 1997-06-11 |
Family
ID=4993128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93120025A Expired - Fee Related CN1035130C (en) | 1993-12-16 | 1993-12-16 | Self balance combined high pressure rotary sealing ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1035130C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102052464A (en) * | 2010-11-10 | 2011-05-11 | 洛阳双瑞特种装备有限公司 | Composite structural rubber seal ring with self-tightening function |
| CN102000701B (en) * | 2010-11-24 | 2013-05-22 | 马鞍山钢铁股份有限公司 | Reduction adjustment device of short stress path rolling mill |
| CN103980639A (en) * | 2014-05-22 | 2014-08-13 | 徐伯琴 | Production technique of high-wear-resistance seal ring |
| CN107228195A (en) * | 2016-03-25 | 2017-10-03 | 哈尔滨飞机工业集团有限责任公司 | A kind of combination sealing method on undercarriage |
| CN109404537A (en) * | 2018-09-27 | 2019-03-01 | 浙江省仙居县中兴橡胶密封件有限公司 | A kind of two-way dustband of polytetrafluoroethylene (PTFE) |
| CN110966434B (en) * | 2018-09-29 | 2022-09-27 | 浙江三花汽车零部件有限公司 | Ball valve |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034986A (en) * | 1988-01-13 | 1989-08-23 | 布隆福斯造船公司 | Be used for shaft sealing, especially for the assembly parts of the shaft sealing of the stern tube of ship |
-
1993
- 1993-12-16 CN CN93120025A patent/CN1035130C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034986A (en) * | 1988-01-13 | 1989-08-23 | 布隆福斯造船公司 | Be used for shaft sealing, especially for the assembly parts of the shaft sealing of the stern tube of ship |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1090634A (en) | 1994-08-10 |
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