CN101936397A - Combined PTFE oil seal with vent hole and manufacturing method and mounting method thereof - Google Patents
Combined PTFE oil seal with vent hole and manufacturing method and mounting method thereof Download PDFInfo
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- CN101936397A CN101936397A CN2010102742154A CN201010274215A CN101936397A CN 101936397 A CN101936397 A CN 101936397A CN 2010102742154 A CN2010102742154 A CN 2010102742154A CN 201010274215 A CN201010274215 A CN 201010274215A CN 101936397 A CN101936397 A CN 101936397A
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Abstract
The invention relates to a sealing component technology, in particular to a combined PTFE oil seal with a vent hole and a manufacturing method and a mounting method thereof. An oil seal body comprises an outer framework, an outer elastic sealing body, an inner framework, a main PTFE sealing lip, an auxiliary PTFE sealing lip and an elastic sealing gasket, and the combined PTFE oil seal is characterized in that the vent hole is arranged in a length space, wherein the lower surface is positioned on the auxiliary PTFE sealing lip and exposed on a bottom gap formed by the auxiliary PTFE sealing lip, the elastic sealing gasket and the outer framework, and the upper surface is in close contact with the main PTFE sealing lip. The closed space of the combined PTFE oil seal with the vent hole is communicated with external space, thereby ensuring the free air circulation, keeping the normal pressure, disabling other external impurities, such as dust, sewage and the like from passing, eliminating the adverse effects of pumping effect on the sealing lips, eliminating the undesirable temperature fluctuations, avoiding performance reduction of the oil seal body or sealing failure and ensuring the stable sealing effect and the service life.
Description
Technical field
The present invention relates to a kind of black box technology, especially a kind of combined type PTFE oil sealing and manufacturing and installation method with vent.
Background technique
Present combined type PTFE oil sealing progressively is widely used because of characteristics such as the self-lubricating property of its PTFE material self excellence, resistance to high temperature, medium-resistances.Conventional its oil seal body of combined type PTFE oil sealing generally is made of outer skeleton, outer elastic sealing element, inner frame, main PTFE sealing lip sheet, secondary PTFE sealing lip sheet, elastic sealing gasket; Outer elastic sealed body is by high temperature vulcanized attached on the outer skeleton; During installation, outer elastic sealed body and seat hole interference fit make oil seal body and seat hole keep relatively-stationary position, thereby realize the sealing to the hole; Elastic sealing gasket, secondary PTFE sealing lip sheet, main PTFE sealing lip sheet, inner frame overlay on the outer skeleton inner bottom plane successively; Carry out the flange group technology by external skeleton, make and axially realize between each assembly closely cooperating, prevent that sealing medium is from seepage between each assembly surface of contact; But when oil seal body was installed and used, main PTFE sealing lip sheet, secondary PTFE sealing lip sheet and running shaft formed lip seal band and confined space; At the sealing strip position, Design and Machining has spirality backflow line on the PTFE sealing lip sheet; So in the running, lip seal band position can form pump and inhale effect, thereby reaches to the sealing of interior media and to the usefulness that stops of external agency invasion; But also because the pump of lip seal band is inhaled effect, the confined space inner air is discharged gradually, form negative pressure, main PTFE sealing lip sheet, secondary PTFE sealing lip sheet are formed pumping action, cause main PTFE sealing lip sheet, secondary PTFE sealing lip sheet generation deformation, thereby the PTFE of winner sealing lip sheet, secondary PTFE sealing lip sheet are increased to the power of holding tightly of running shaft, cause temperature rise to strengthen, seal, running shaft and sealing medium are produced harmful effect, can cause phenomenons such as main PTFE sealing lip sheet, secondary PTFE sealing lip sheet turn over, tear in taking place when serious, cause seal failure.Need a kind of confined space to be connected with space outerpace for this reason, thereby guarantee the air free flow, keep normal pressure, and other external agency, as combined type PTFE oil sealing and manufacturing and the installation method that dust, sewage etc. but can't pass through, can eliminate pump like this and inhale the harmful effect that effect is produced the sealing lip sheet, eliminate bad temperature fluctuation, thereby avoid the performance of oil seal body to reduce or seal failure, guarantee stable sealing effect and working life.
Summary of the invention
Of the present invention a kind of with vent combined type PTFE oil sealing and manufacturing and installation method to have solved combined type PTFE oil sealing commonly used at present ubiquitous because the pump of lip seal band is inhaled effect, the confined space inner air is discharged gradually, form negative pressure, to main PTFE sealing lip sheet, secondary PTFE sealing lip sheet forms pumping action, cause main PTFE sealing lip sheet, secondary PTFE sealing lip sheet generation deformation, thereby make the PTFE of winner sealing lip sheet, secondary PTFE sealing lip sheet increases the power of holding tightly of running shaft, cause temperature rise to strengthen, to seal, running shaft and sealing medium produce harmful effect, can cause main PTFE sealing lip sheet when serious, secondary PTFE sealing lip sheet turns in taking place, phenomenon such as tear, cause the problem of seal failure; A kind of combined type PTFE oil sealing that has vent of the present invention, its confined space is connected with space outerpace, thereby guarantee the air free flow, keep normal pressure, and other external agency can't pass through but as dust, sewage etc., can eliminate pump like this and inhale the harmful effect that effect is produced the sealing lip sheet, eliminate bad temperature fluctuation, thereby avoid the performance of oil seal body to reduce or seal failure, guarantee stable sealing effect and working life.
The technical solution adopted in the present invention is:
A kind of combined type PTFE oil sealing that has vent, its oil seal body comprises outer skeleton, outer elastic sealed body, inner frame, main PTFE sealing lip sheet, secondary PTFE sealing lip sheet and elastic sealing gasket, it is characterized in that: be positioned at lower surface on the secondary PTFE sealing lip sheet and expose by secondary PTFE sealing lip sheet, elastic sealing gasket with outside skeleton space, formed bottom and upper surface and main PTFE sealing lip sheet the length space that closely contacts be provided with vent.
The described combined type PTFE oil sealing that has vent, the position of its vent is arranged on the position of being partial to the elastic sealing gasket endoporus.
The described combined type PTFE oil sealing that has vent, its elastic sealing gasket, secondary PTFE sealing lip sheet, main PTFE sealing lip sheet, inner frame overlay on the outer skeleton inner bottom plane successively.
The described combined type PTFE oil sealing that has vent, its oil seal body is when installing and using, main PTFE sealing lip sheet, secondary PTFE sealing lip sheet and running shaft form lip seal band and confined space, and space, bottom and vent are by contact zones and confined space formation connectivity structure between formed between secondary PTFE sealing lip sheet and the main PTFE sealing lip sheet, and outer elastic sealed body and seat hole interference fit, make oil seal body and seat hole keep the relative fixed position, thereby realize sealing the hole.
The described combined type PTFE oil sealing that has vent, it is in main PTFE sealing lip sheet, secondary PTFE sealing lip sheet and the formed lip seal band of running shaft position, main PTFE sealing lip sheet and secondary PTFE sealing lip sheet are provided with wall scroll formula or many formula backflow lines, and the backflow line be shaped as spirality, or zigzag fashion, or waveform, or any combining form of the two above shape wherein.
The described combined type PTFE oil sealing that has vent, its outer skeleton forms the flange composite structure by the flange group technology, makes to closely cooperate axial the realization between each assembly of oil seal body, thereby prevents that sealing medium between each assembly surface of contact seepage taking place.
The described combined type PTFE oil sealing that has vent, its outer elastic sealed body is by high temperature vulcanized attached on the outer skeleton.
The described combined type PTFE oil sealing that has vent, the diameter of its vent is 1-2mm, and its quantity is one or more, and it is shaped as circle, or oval, or polygonal, or non-regular shape, or wherein any combining form of shape more than two kinds.
Its manufacture method of combined type PTFE oil sealing of described band vent is characterized in that:
The first step, once sulfuration: the outer elastic sealed body compound blank that pre-shaping is good with through surface treatment and apply outside the metal of fluorine glue adhesive specially skeleton under 175 ℃-185 ℃ temperature conditions, on vulcanizing press, once vulcanized in injection sulfurization 3-5 minute, sulfide stress is 5-10Mpa, makes outer elastic sealed body sulfuration attached on the outer skeleton;
In second step, post-cure: the outer elastic sealed body that will once vulcanizate is placed in 200 ℃-220 ℃ the air oven and carried out post-cure 6-15 hour;
In the 3rd step, the excision burr: the outer elastic sealed body that post-cure is good makes product reach appearance requirement excising unnecessary burr on the product according to the drawing regulation on the incising machine.
The 4th step, mold pressing backflow line: in lip seal band position, adopt the method processing backflow line of mold pressing on main PTFE sealing lip sheet and the secondary PTFE sealing lip sheet, it is processed into wall scroll formula or many formulas, and it is shaped as spirality, or zigzag fashion, or waveform, or the combining form of the two above shape arbitrarily wherein.
The 5th step, punching press vent: on secondary PTFE sealing lip sheet, be positioned at lower surface and expose by secondary PTFE sealing lip sheet, elastic sealing gasket and outer skeleton space, formed bottom and upper surface and main PTFE sealing lip sheet in the length space that closely contact the method for employing punching press process vent, the stamping position of vent is arranged on the position of being partial to the elastic sealing gasket endoporus, the diameter dimension of vent is 1-2mm, the processing quantity of vent is one or more, it is shaped as circle, or it is oval, or polygonal, or non-regular shape, or wherein any combining form of shape more than two kinds.
The 6th step, combination oil seal: elastic sealing gasket, secondary PTFE sealing lip sheet, main PTFE sealing lip sheet and inner frame are overlayed on the inner bottom plane of outer skeleton successively, the outer skeleton of flange combination is processed into one by the flange group technology with outer skeleton and other assemblying then.
Its installation method of combined type PTFE oil sealing of described band vent, it is characterized in that: during installation, outer elastic sealed body and seat hole interference fit, make oil seal body and seat hole keep the relative fixed position, thereby realize sealing to the hole, and main PTFE sealing lip sheet, secondary PTFE sealing lip sheet and running shaft form lip seal band and confined space, and its bottom space and vent are by contact zones and confined space formation connectivity structure between formed between secondary PTFE sealing lip sheet and the main PTFE sealing lip sheet, and closely cooperate axial the realization between each assembly of oil seal body, thereby prevent that sealing medium between each assembly surface of contact seepage taking place.
Like this in when work, a kind of combined type PTFE oil sealing that has vent of the present invention, contact zones between its sheet are because factors such as its contact pressure and surface finishment can guarantee the air free flow, and other external agencys can't pass through as dust, sewage etc.; During running, because inhaling effect, pump cause confined space to produce negative pressure, thereby outside air is produced pumping action, and outside air enters confined space via space, bottom and vent by the connectivity structure that contact zones and confined space constitute between formed between secondary PTFE sealing lip sheet and the main PTFE sealing lip sheet, it is connected with space outerpace, keep normal pressure, thereby avoided because pump is inhaled the harmful effect that effect produces the sealing lip sheet, eliminated bad temperature fluctuation, avoid the performance of oil seal body to reduce or seal failure, guaranteed stable sealing effect and working life.
It is ubiquitous because the pump of lip seal band is inhaled effect that a kind of combined type PTFE oil sealing that has vent of the present invention has solved combined type PTFE oil sealing commonly used at present, the confined space inner air is discharged gradually, form negative pressure, to main PTFE sealing lip sheet, secondary PTFE sealing lip sheet forms pumping action, cause main PTFE sealing lip sheet, secondary PTFE sealing lip sheet generation deformation, thereby make the PTFE of winner sealing lip sheet, secondary PTFE sealing lip sheet increases the power of holding tightly of running shaft, cause temperature rise to strengthen, to seal, running shaft and sealing medium produce harmful effect, can cause main PTFE sealing lip sheet when serious, secondary PTFE sealing lip sheet turns in taking place, phenomenon such as tear, cause the problem of seal failure; A kind of combined type PTFE oil sealing that has vent of the present invention, its confined space is connected with space outerpace, thereby guarantee the air free flow, keep normal pressure, and other external agency can't pass through but as dust, sewage etc., can eliminate pump like this and inhale the harmful effect that effect is produced the sealing lip sheet, eliminate bad temperature fluctuation, thereby avoid the performance of oil seal body to reduce or seal failure, guarantee stable sealing effect and working life.
Description of drawings
Fig. 1 is original combined type PTFE oil seal structure schematic representation;
Fig. 2 is a kind of combined type PTFE oil seal structure schematic representation that has vent of the present invention.
Wherein, 1 is oil seal body, and 2 is outer skeleton, 3 is outer elastic sealed body, and 4 is inner frame, and 5 is main PTFE sealing lip sheet, 6 is secondary PTFE sealing lip sheet, and 7 is elastic sealing gasket, and 8 is the space, bottom, 9 are the backflow line, and 10 is vent, and 11 is running shaft, 12 is the lip seal band, 13 is contact zones between sheet, and 14 is confined space, and 15 is the seat hole.
Embodiment
As depicted in figs. 1 and 2, wherein Fig. 1 is original combined type PTFE oil seal structure schematic representation, and its oil seal body 1 comprises outer skeleton 2, outer elastic sealed body 3, inner frame 4, main PTFE sealing lip sheet 5, secondary PTFE sealing lip sheet 6 and elastic sealing gasket 7; Main PTFE sealing lip sheet 5, secondary PTFE sealing lip sheet 6 form lip seal band 12 and confined space 14 with running shaft 11; In lip seal band 12 positions, main PTFE sealing lip sheet 5 and secondary PTFE sealing lip sheet 6 are provided with backflow line 9.
Fig. 2 is a kind of combined type PTFE oil seal structure schematic representation that has vent of the present invention, its oil seal body 1 comprises outer skeleton 2, outer elastic sealed body 3, inner frame 4, main PTFE sealing lip sheet 5, secondary PTFE sealing lip sheet 6 and elastic sealing gasket 7, it is characterized in that: on secondary PTFE sealing lip sheet 6, be positioned at lower surface and expose by secondary PTFE sealing lip sheet 6, in 5 length spaces that closely contact of elastic sealing gasket 7 and outer skeleton space 8,2 formed bottom and upper surface and main PTFE sealing lip sheet, be provided with the round vent 10 of a 1mm in the position of being partial to elastic sealing gasket 7 endoporus.Elastic sealing gasket 7, secondary PTFE sealing lip sheet 6, main PTFE sealing lip sheet 5, inner frame 4 overlay on the outer skeleton 2 inner bottom planes successively; Oil seal body 1 is when installing and using, and main PTFE sealing lip sheet 5, secondary PTFE sealing lip sheet 6 form lip seal band 12 and confined space 14 with running shaft 11; Bottom space 8 and vent 10 by between secondary PTFE sealing lip sheet 6 and the main PTFE sealing lip sheet 5 between formed contact zones 13 constitute connectivity structures with confined space 14; In lip seal band 12 positions, main PTFE sealing lip sheet 5 and secondary PTFE sealing lip sheet 6 are provided with wall scroll formula spirality backflow line 9; Outer skeleton 2 forms the flange composite structure by the flange group technology, makes to closely cooperate axial the realization between oil seal body 1 each assembly, thereby prevents that sealing medium between each assembly surface of contact seepage taking place; When mounted, outer elastic sealed body 3 is by high temperature vulcanized attached on the outer skeleton 2, and itself and seat hole 15 interference fit, makes oil seal body 1 and 15 maintenance relative fixed positions, seat hole, thereby realization is to the sealing in hole.
Like this in when work, a kind of combined type PTFE oil sealing that has vent of the present invention, contact zones 13 between its sheet are because factors such as its contact pressure and surface finishment can guarantee the air free flow, and other external agencys can't pass through as dust, sewage etc.; During running, because inhaling effect, pump cause confined space 14 to produce negative pressure, thereby outside air is produced pumping action, and outside air via space, bottom 8 and vent 10 by between secondary PTFE sealing lip sheet 6 and the main PTFE sealing lip sheet 5 between formed contact zones 13 enter confined space 14 with the connectivity structure that confined space 14 constitutes, it is connected with space outerpace, keep normal pressure, thereby avoided because pump is inhaled the harmful effect that effect produces the sealing lip sheet, eliminated bad temperature fluctuation, avoid the performance of oil seal body 1 to reduce or seal failure, guaranteed stable sealing effect and working life.
With embodiment 1, different is, be positioned at lower surface on the secondary PTFE sealing lip sheet 6 and expose by secondary PTFE sealing lip sheet 6, elastic sealing gasket 7 with outside skeleton space 8,2 formed bottom and upper surface and 5 length spaces that closely contact of main PTFE sealing lip sheet, be provided with two elliptical vent hole 10 in the position of being partial to elastic sealing gasket 7 endoporus; In lip seal band 12 positions, main PTFE sealing lip sheet 5 and secondary PTFE sealing lip sheet 6 are provided with two formula zigzag fashion backflow lines 9.
With embodiment 1, different is, be positioned at lower surface on the secondary PTFE sealing lip sheet 6 and expose by secondary PTFE sealing lip sheet 6, elastic sealing gasket 7 with outside skeleton space 8,2 formed bottom and upper surface and 5 length spaces that closely contact of main PTFE sealing lip sheet, be provided with the round vent 10 of a 2mm in the position of being partial to elastic sealing gasket 7 endoporus.
With embodiment 1, different is, be positioned at lower surface on the secondary PTFE sealing lip sheet 6 and expose by secondary PTFE sealing lip sheet 6, elastic sealing gasket 7 with outside skeleton space 8,2 formed bottom and upper surface and 5 length spaces that closely contact of main PTFE sealing lip sheet, be provided with the round vent 10 of a 1.5mm in the position of being partial to elastic sealing gasket 7 endoporus.
The manufacture method of the combined type PTFE oil sealing that has vent of the foregoing description 1:
The first step, once sulfuration: outer elastic sealed body 3 compound blanks that pre-shaping is good with through surface treatment and apply outside the metal of fluorine glue adhesive specially skeleton 2 under 175 ℃ temperature conditions, injection sulfurization once vulcanized in 5 minutes on vulcanizing press, sulfide stress is 10Mpa, makes outer elastic sealed body 3 sulfurations attached on the outer skeleton 2;
In second step, post-cure: the outer elastic sealed body 3 that will once vulcanizate is placed in 200 ℃ the air oven and carried out post-cure 15 hours;
In the 3rd step, the excision burr: the outer elastic sealed body 3 that post-cure is good makes product reach appearance requirement excising unnecessary burr on the product according to the drawing regulation on the incising machine.
The 4th step, mold pressing backflow line 9:, adopt the method processing wall scroll formula spirality backflow line 9 of mold pressing on main PTFE sealing lip sheet 5 and the secondary PTFE sealing lip sheet 6 in lip seal band 12 positions.
The 5th step, punching press vent 10: be positioned at lower surface on the secondary PTFE sealing lip sheet 6 and expose by secondary PTFE sealing lip sheet 6, elastic sealing gasket 7 with outside skeleton space 8,2 formed bottom and upper surface and 5 length spaces that closely contact of main PTFE sealing lip sheet, be partial to the position of elastic sealing gasket 7 endoporus, and adopt the round vent 10 of a 1mm of method processing of punching press.
The 6th step, combination oil seal: elastic sealing gasket 7, secondary PTFE sealing lip sheet 6, main PTFE sealing lip sheet 5 and inner frame 4 are overlayed on the inner bottom plane of outer skeleton 2 successively, the outer skeleton 2 of flange combination is integral outer skeleton 2 by the flange group technology with other assemblying then.
The manufacture method of the combined type PTFE oil sealing that has vent of the foregoing description 3:
The first step, once sulfuration: outer elastic sealed body 3 compound blanks that pre-shaping is good with through surface treatment and apply outside the metal of fluorine glue adhesive specially skeleton 2 under 185 ℃ temperature conditions, injection sulfurization once vulcanized in 3 minutes on vulcanizing press, sulfide stress is 5Mpa, makes outer elastic sealed body 3 sulfurations attached on the outer skeleton 2;
In second step, post-cure: the outer elastic sealed body 3 that will once vulcanizate is placed in 220 ℃ the air oven and carried out post-cure 6 hours;
In the 3rd step, the excision burr: the outer elastic sealed body 3 that post-cure is good makes product reach appearance requirement excising unnecessary burr on the product according to the drawing regulation on the incising machine.
The 4th step, mold pressing backflow line 9:, adopt the method processing wall scroll formula spirality backflow line 9 of mold pressing on main PTFE sealing lip sheet 5 and the secondary PTFE sealing lip sheet 6 in lip seal band 12 positions.
The 5th step, punching press vent 10: be positioned at lower surface on the secondary PTFE sealing lip sheet 6 and expose by secondary PTFE sealing lip sheet 6, elastic sealing gasket 7 with outside skeleton space 8,2 formed bottom and upper surface and 5 length spaces that closely contact of main PTFE sealing lip sheet, be partial to the position of elastic sealing gasket 7 endoporus, and adopt the round vent 10 of a 2mm of method processing of punching press.
The 6th step, combination oil seal: elastic sealing gasket 7, secondary PTFE sealing lip sheet 6, main PTFE sealing lip sheet 5 and inner frame 4 are overlayed on the inner bottom plane of outer skeleton 2 successively, the outer skeleton 2 of flange combination is integral outer skeleton 2 by the flange group technology with other assemblying then.
The manufacture method of the combined type PTFE oil sealing that has vent of the foregoing description 4:
The first step, once sulfuration: outer elastic sealed body 3 compound blanks that pre-shaping is good with through surface treatment and apply outside the metal of fluorine glue adhesive specially skeleton 2 under 180 ℃ temperature conditions, injection sulfurization once vulcanized in 4 minutes on vulcanizing press, sulfide stress is 7.5Mpa, makes outer elastic sealed body 3 sulfurations attached on the outer skeleton 2;
In second step, post-cure: the outer elastic sealed body 3 that will once vulcanizate is placed in 210 ℃ the air oven and carried out post-cure 10.5 hours;
In the 3rd step, the excision burr: the outer elastic sealed body 3 that post-cure is good makes product reach appearance requirement excising unnecessary burr on the product according to the drawing regulation on the incising machine.
The 4th step, mold pressing backflow line 9:, adopt the method processing wall scroll formula spirality backflow line 9 of mold pressing on main PTFE sealing lip sheet 5 and the secondary PTFE sealing lip sheet 6 in lip seal band 12 positions.
The 5th step, punching press vent 10: be positioned at lower surface on the secondary PTFE sealing lip sheet 6 and expose by secondary PTFE sealing lip sheet 6, elastic sealing gasket 7 with outside skeleton space 8,2 formed bottom and upper surface and 5 length spaces that closely contact of main PTFE sealing lip sheet, be partial to the position of elastic sealing gasket 7 endoporus, and adopt the round vent 10 of a 1.5mm of method processing of punching press.
The 6th step, combination oil seal: elastic sealing gasket 7, secondary PTFE sealing lip sheet 6, main PTFE sealing lip sheet 5 and inner frame 4 are overlayed on the inner bottom plane of outer skeleton 2 successively, the outer skeleton 2 of flange combination is integral outer skeleton 2 by the flange group technology with other assemblying then.
The installation method of the combined type PTFE oil sealing that has vent of the foregoing description 1: during installation, outer elastic sealed body 3 and seat hole 15 interference fit, make oil seal body 1 and seat hole 15 keep the relative fixed position, thereby realize sealing to the hole, and main PTFE sealing lip sheet 5, secondary PTFE sealing lip sheet 6 forms lip seal band 12 and confined space 14 with running shaft 11, and its bottom space 8 and vent 10 by between secondary PTFE sealing lip sheet 6 and the main PTFE sealing lip sheet 5 between formed contact zones 13 constitute connectivity structures with confined space 14, and closely cooperate axial the realization between oil seal body 1 each assembly, thereby prevent that sealing medium between each assembly surface of contact seepage taking place.
It is ubiquitous because the pump of lip seal band is inhaled effect that a kind of combined type PTFE oil sealing that has vent of the present invention has solved combined type PTFE oil sealing commonly used at present, the confined space inner air is discharged gradually, form negative pressure, to main PTFE sealing lip sheet, secondary PTFE sealing lip sheet forms pumping action, cause main PTFE sealing lip sheet, secondary PTFE sealing lip sheet generation deformation, thereby make the PTFE of winner sealing lip sheet, secondary PTFE sealing lip sheet increases the power of holding tightly of running shaft, cause temperature rise to strengthen, to seal, running shaft and sealing medium produce harmful effect, can cause main PTFE sealing lip sheet when serious, secondary PTFE sealing lip sheet turns in taking place, phenomenon such as tear, cause the problem of seal failure; A kind of combined type PTFE oil sealing that has vent of the present invention, its confined space is connected with space outerpace, thereby guarantee the air free flow, keep normal pressure, and other external agency can't pass through but as dust, sewage etc., can eliminate pump like this and inhale the harmful effect that effect is produced the sealing lip sheet, eliminate bad temperature fluctuation, thereby avoid the performance of oil seal body to reduce or seal failure, guarantee stable sealing effect and working life.
Obviously, the above embodiment of the present invention only is for example of the present invention clearly is described, and is not to be qualification to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here can't give exhaustive to all mode of executions.Everyly belong to the row that conspicuous variation that technological scheme of the present invention extends out or change still are in protection scope of the present invention.
Claims (10)
1. combined type PTFE oil sealing that has vent, its oil seal body (1) comprises outer skeleton (2), outer elastic sealed body (3), inner frame (4), main PTFE sealing lip sheet (5), secondary PTFE sealing lip sheet (6) and elastic sealing gasket (7), it is characterized in that: be positioned at lower surface on the secondary PTFE sealing lip sheet (6) and expose by secondary PTFE sealing lip sheet (6), elastic sealing gasket (7) with outside space, the formed bottom of skeleton (2) (8) and upper surface and main PTFE sealing lip sheet (5) the length space that closely contacts be provided with vent (10).
2. the combined type PTFE oil sealing that has vent according to claim 1, it is characterized in that: the position of vent (10) is arranged on the position of being partial to elastic sealing gasket (7) endoporus.
3. the combined type PTFE oil sealing that has vent according to claim 1 is characterized in that: elastic sealing gasket (7), secondary PTFE sealing lip sheet (6), main PTFE sealing lip sheet (5), inner frame (4) overlay on outer skeleton (2) the inner bottom plane successively.
4. the combined type PTFE oil sealing that has vent according to claim 1, it is characterized in that: oil seal body (1) is when installing and using, main PTFE sealing lip sheet (5), secondary PTFE sealing lip sheet (6) forms lip seal band (12) and confined space (14) with running shaft (11), and space, bottom (8) and vent (10) are by contact zones (13) and confined space (14) formation connectivity structure between formed between secondary PTFE sealing lip sheet (6) and the main PTFE sealing lip sheet (5), and outer elastic sealed body (3) and seat hole (15) interference fit, make oil seal body (1) and seat hole (15) keep the relative fixed position, thereby realize sealing the hole.
5. the combined type PTFE oil sealing that has vent according to claim 1, it is characterized in that: at main PTFE sealing lip sheet (5), secondary PTFE sealing lip sheet (6) and the formed lip seal band of running shaft (11) (12) position, main PTFE sealing lip sheet (5) and secondary PTFE sealing lip sheet (6) are provided with wall scroll formula or many formula backflow lines (9), and backflow line (9) be shaped as spirality, or zigzag fashion, or waveform, or any combining form of the two above shape wherein.
6. the combined type PTFE oil sealing that has vent according to claim 1, it is characterized in that: outer skeleton (2) forms the flange composite structure by the flange group technology, make to closely cooperate axial the realization between each assembly of oil seal body (1), thereby prevent that sealing medium between each assembly surface of contact seepage taking place.
7. the combined type PTFE oil sealing that has vent according to claim 1 is characterized in that: outer elastic sealed body (3) is by high temperature vulcanized attached on the outer skeleton (2).
8. the combined type PTFE oil sealing that has vent according to claim 1, it is characterized in that: the diameter of vent (10) is 1-2mm, its quantity is one or more, it is shaped as circle, or it is oval, or polygonal, or non-regular shape, or wherein any combining form of shape more than two kinds.
9. according to its manufacture method of combined type PTFE oil sealing of the described band vent of claim 1-8, it is characterized in that:
The first step, once sulfuration: outer elastic sealed body (3) compound blank that pre-shaping is good with through surface treatment and apply outside the metal of fluorine glue adhesive specially skeleton (2) under 175 ℃-185 ℃ temperature conditions, on vulcanizing press, once vulcanized in injection sulfurization 3-5 minute, sulfide stress is 5-10Mpa, makes outer elastic sealed body (3) sulfuration attached on the outer skeleton (2);
In second step, post-cure: the outer elastic sealed body (3) that will once vulcanizate is placed in 200 ℃-220 ℃ the air oven and carried out post-cure 6-15 hour;
In the 3rd step, the excision burr: the outer elastic sealed body (3) that post-cure is good makes product reach appearance requirement excising unnecessary burr on the product according to the drawing regulation on the incising machine.
The 4th step, mold pressing backflow line (9): in lip seal band (12) position, main PTFE sealing lip sheet (5) and secondary PTFE sealing lip sheet (6) are gone up the method processing backflow line (9) that adopts mold pressing, it is processed into wall scroll formula or many formulas, and it is shaped as spirality, or zigzag fashion, or waveform, or the combining form of the two above shape arbitrarily wherein.
The 5th step, punching press vent (10): on secondary PTFE sealing lip sheet (6), be positioned at lower surface and expose by secondary PTFE sealing lip sheet (6), elastic sealing gasket (7) and space, the formed bottom of outer skeleton (2) (8) and upper surface and main PTFE sealing lip sheet (5) in the length space that closely contact the method for employing punching press process vent (10), the stamping position of vent (10) is arranged on the position of being partial to elastic sealing gasket (7) endoporus, the diameter dimension of vent (10) is 1-2mm, the processing quantity of vent (10) is one or more, it is shaped as circle, or it is oval, or polygonal, or non-regular shape, or wherein any combining form of shape more than two kinds.
The 6th step, combination oil seal: elastic sealing gasket (7), secondary PTFE sealing lip sheet (6), main PTFE sealing lip sheet (5) and inner frame (4) are overlayed on the inner bottom plane of outer skeleton (2) successively, flange combination outer skeleton (2) is integral outer skeleton (2) and other assemblying by the flange group technology then.
10. according to its installation method of combined type PTFE oil sealing of the described band vent of claim 1-8, it is characterized in that: during installation, outer elastic sealed body (3) and seat hole (15) interference fit, make oil seal body (1) and seat hole (15) keep the relative fixed position, thereby realize sealing to the hole, and main PTFE sealing lip sheet (5), secondary PTFE sealing lip sheet (6) forms lip seal band (12) and confined space (14) with running shaft (11), and its bottom space (8) and vent (10) are by contact zones (13) and confined space (14) formation connectivity structure between formed between secondary PTFE sealing lip sheet (6) and the main PTFE sealing lip sheet (5), and closely cooperate axial the realization between each assembly of oil seal body (1), thereby prevent that sealing medium between each assembly surface of contact seepage taking place.
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| CN2010102742154A CN101936397A (en) | 2010-09-07 | 2010-09-07 | Combined PTFE oil seal with vent hole and manufacturing method and mounting method thereof |
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| CN2010102742154A CN101936397A (en) | 2010-09-07 | 2010-09-07 | Combined PTFE oil seal with vent hole and manufacturing method and mounting method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230539A (en) * | 2011-07-19 | 2011-11-02 | 中国航空动力机械研究所 | Oil seal structure and forming method thereof |
| CN104653784A (en) * | 2015-01-26 | 2015-05-27 | 广州机械科学研究院有限公司 | High-speed oil sealing structure |
| CN105008775A (en) * | 2013-02-27 | 2015-10-28 | 株式会社小松制作所 | Oil seal |
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| CN102230539A (en) * | 2011-07-19 | 2011-11-02 | 中国航空动力机械研究所 | Oil seal structure and forming method thereof |
| CN105008775A (en) * | 2013-02-27 | 2015-10-28 | 株式会社小松制作所 | Oil seal |
| CN105008775B (en) * | 2013-02-27 | 2017-09-29 | 株式会社小松制作所 | Oil sealing |
| US10060532B2 (en) | 2013-02-27 | 2018-08-28 | Komatsu Ltd. | Oil seal |
| CN104653784A (en) * | 2015-01-26 | 2015-05-27 | 广州机械科学研究院有限公司 | High-speed oil sealing structure |
| CN108999978A (en) * | 2018-09-17 | 2018-12-14 | 嘉科（安徽）密封技术有限公司 | A kind of PTFE seal lips |
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Application publication date: 20110105 |