CN109737204B - Combined piston sealing element - Google Patents
Combined piston sealing element Download PDFInfo
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- CN109737204B CN109737204B CN201910171369.1A CN201910171369A CN109737204B CN 109737204 B CN109737204 B CN 109737204B CN 201910171369 A CN201910171369 A CN 201910171369A CN 109737204 B CN109737204 B CN 109737204B
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- floating ring
- piston
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- ring
- shaped floating
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Abstract
The invention discloses a combined piston sealing element, and relates to the technical field of sealing rings, in particular to a cylinder, a hot cavity and a through hole, wherein a convex top cavity is arranged inside the cylinder, the bottom of the convex top cavity is connected with a piston, a micro-hole is arranged inside the top end of the convex top cavity, the hot cavity is arranged above the convex top cavity, the outer wall surface of the piston is provided with a guide ring, an upper combined sealing element is arranged below the guide ring, a lower combined sealing element is arranged below the upper combined sealing element, the upper combined sealing element and the lower combined sealing element are respectively arranged inside the outer wall surface of the piston, and the through hole is arranged inside the top end of the piston. The combined piston sealing element has the advantages that in the working state, the section of the floating ring is in the shape of a semi-rectangular barrel surface, the lower edge of the excircle working surface of the floating ring is in contact with the cylinder wall, and the lower edge of the inner circle of the floating ring is in contact with the C-shaped compensation protrusion, so that the sealing performance is good, and the semi-rectangular angle is 7 degrees according to the standard regulation.
Description
Technical Field
The invention relates to the technical field of sealing rings, in particular to a combined piston sealing element.
Background
With the development of science and technology, great importance is placed on the development of sealing technology at home and abroad, and achievements are obtained, such as a sock type sealing device of Netherlands Philips company and a novel sliding sealing device of Swedish combined Stirling engine company, which have good effects, low cost and long service life.
Although the cylinder sealing structure and the sealing material thereof disclosed in the chinese patent application publication specification CN102269273B have simple structure and plastic compensation function, and achieve small frictional resistance, solve the problems of slow aging of the sealing member under the working condition of high temperature radiation, improved wear resistance of the sealing member under the working condition of poor lubrication or oil-free lubrication, and prolonged effective sealing period, the cylinder sealing structure and the sealing material thereof have the advantages that because the sealing ring has a large contact surface with the cylinder body, the frictional resistance is too large under the pressure action, the excessive frictional resistance easily causes premature wear of the sealing ring and failure, the service life of the sealing ring is shortened, and because the sealing structure can not carry out double sealing protection on the piston and the cylinder wall, a large gap is generated between the piston and the cylinder wall during working, thereby having the defects of influencing the sealing performance between the two parts, and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a combined piston sealing element, which solves the problems that the sealing performance between a piston and a cylinder wall is influenced and the like because the sealing ring has a large contact surface with the cylinder body, the friction resistance is overlarge under the action of pressure, the overlarge friction resistance easily causes premature wear and failure of the sealing ring, the service life of the sealing ring is shortened, and the double sealing protection cannot be performed between the piston and the cylinder wall, so that a large gap is generated between the piston and the cylinder wall during the work.
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a combined piston sealing member, includes cylinder, hot chamber and through-hole, the inside of cylinder is provided with the protruding top cavity, and the bottom of protruding top cavity is connected with the piston, the inside miniature aperture that is provided with in top of protruding top cavity, the hot chamber sets up in the top of protruding top cavity, the outer wall surface of piston is provided with the guide ring, and the below of guide ring is provided with combination formula sealing member, the below of going up combination formula sealing member is provided with down combination formula sealing member, and goes up combination formula sealing member and lower combination formula sealing member and set up respectively in the inside of piston outer wall surface, the through-hole sets up in the inside of top of piston, and is provided with miniature passageway between through-hole and the lower combination formula sealing member, the inside of going up combination formula sealing member is provided with first O type floating ring, and the one end of first O type floating ring is connected with second O type, The second O-shaped floating ring is arranged inside the lower combined type sealing element, a leather cup is arranged at the inner circle of the second O-shaped floating ring and arranged inside the upper combined type sealing element, C-shaped compensation is arranged at one end of the inner part of the lower combined type sealing element, and a bulge is arranged at the inner circle of the C-shaped compensation.
Optionally, the outer wall surface of the cup in the upper combined sealing element is attached to the outer wall surfaces of the first O-shaped floating ring and the second O-shaped floating ring.
Optionally, a plurality of protrusions are arranged at the C-shaped compensation excircle of the lower combined sealing element, the lower combined sealing element is connected to the inside of the convex top cavity through a micro channel, and the convex top cavity is communicated with the piston hot cavity through a micro small hole.
Optionally, the first O-ring and the second O-ring are made of teflon.
Optionally, the cross sections of the first O-shaped floating ring and the second O-shaped floating ring are both in a half-trapezoid barrel shape, the first O-shaped floating ring is an open ring in an oblique opening form, and the second O-shaped floating ring is a closed ring.
Optionally, the leather cup and the C-shaped compensation are both made of fluororubber materials.
The invention provides a combined piston sealing element, which has the following beneficial effects:
1. this combination piston seal, through first O type floating ring, the setting of size and position between second O type floating ring and the leather cup, can move carrying on of work for floating ring and facilitate, when hot intracavity portion atmospheric pressure is great promptly, extrude the leather cup cavity, make leather cup extrusion first O type floating ring, second O type floating ring, thereby reach the position compensation to the floating ring, thereby make and make up and contact between the inner wall surface of the inside floating ring of formula seal and cylinder, carry out preliminary guarantee to the sealed performance between piston and the protruding top cavity with this.
2. According to the combined piston sealing element, the air pressure at the C-shaped compensation part is equal to the average air pressure of the thermal cavity and the convex top cavity, so that the air pressure phase difference at two ends of the C-shaped compensation is not large, the C-shaped compensation is extruded through the micro-channel air, the first O-shaped floating ring and the second O-shaped floating ring are extruded by the C-shaped compensation excircle protrusion, and therefore the position compensation of the floating rings is achieved.
3. The floating ring of the combined piston sealing element is made of polytetrafluoroethylene which is generally called as a non-stick coating or an easy-to-clean material, has the characteristics of acid and alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents; simultaneously, polytetrafluoroethylene has high temperature resistance's characteristics, and its coefficient of friction is extremely low, and the selection for use of this material has effectually reduced the probability that the inside piece of piston glues and glues in the outer wall surface of floating ring, and reduces the frictional force between floating ring and the cylinder through its coefficient of friction is lower to when protecting the floating ring, also facilitate for going on of piston reciprocating motion work.
4. This combination piston sealing member through the setting of the half trapezoidal bucket face type in floating ring cross-section, can reduce the frictional force between floating ring and the cylinder inner wall surface to this time of running-in between the upper and lower edges and the cylinder that shortens floating ring, thereby reduced because long-time high pressure friction between floating ring edges and corners and the cylinder, the damage that causes the cylinder inner wall surface, with this probability that reduces the scuffing of cylinder phenomenon and produce.
5. This combination piston sealing member has advantages such as high temperature resistant, resistant oil and resistant chemical erosion through fluororubber to can reduce the probability that leather cup and C type compensation received external factor influence, thereby can carry out normal use in the cylinder of high temperature inside, provide the guarantee to the normal operation of seal structure between cylinder and the piston with this.
Drawings
FIG. 1 is a schematic cross-sectional view of a cylinder according to the present invention;
FIG. 2 is a schematic view of the external structure of the cylinder according to the present invention
FIG. 3 is an enlarged view of the structure at A in FIG. 1 according to the present invention.
In the figure: 1. a cylinder; 2. a thermal chamber; 3. a micro-aperture; 4. a convex top cavity; 5. a piston; 6. a guide ring; 7. an upper combination seal; 8. a lower combination seal; 9. a through hole; 10. a microchannel; 11. a first O-ring; 12. the second O-shaped float.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 3, the present invention provides a technical solution: a combined piston sealing element comprises a cylinder 1, a hot cavity 2 and a through hole 9, wherein a convex top cavity 4 is arranged inside the cylinder 1, a piston 5 is connected to the bottom of the convex top cavity 4, a micro-hole 3 is arranged inside the top end of the convex top cavity 4, the hot cavity 2 is arranged above the convex top cavity 4, a guide ring 6 is arranged on the outer wall surface of the piston 5, an upper combined sealing element 7 is arranged below the guide ring 6, the outer wall surface of a leather cup 13 in the upper combined sealing element 7 is attached to the outer wall surfaces of a first O-shaped floating ring 11 and a second O-shaped floating ring 12, and the sizes and positions of the first O-shaped floating ring 11, the second O-shaped floating ring 12 and the leather cup 13 are set, so that convenience is provided for moving work of the floating rings, namely when the air pressure inside the hot cavity 2 is large, the cavity 13 is extruded, and the leather cup 13 extrudes the first O-shaped floating ring 11, The second O-shaped floating ring 12 is used for achieving position compensation of the floating ring, so that the floating ring inside the upper combined type sealing element 7 is in contact with the inner wall surface of the cylinder 1, and the sealing performance between the piston 5 and the convex top cavity 4 is preliminarily guaranteed;
the lower combined type sealing element 8 is arranged below the upper combined type sealing element 7, the upper combined type sealing element 7 and the lower combined type sealing element 8 are respectively arranged inside the outer wall surface of the piston 5, a plurality of protrusions 15 are arranged at the excircle of the C-shaped compensation 14 in the lower combined type sealing element 8, the lower combined type sealing element 8 is connected to the inside of the convex top cavity 4 through the micro channel 10, the convex top cavity 4 is communicated with the piston hot cavity 2 through the micro small hole 3, the air pressure at the excircle of the C-shaped compensation 14 is equivalent to the average air pressure of the hot cavity 2 and the convex top cavity 4, so the air pressure difference at two ends of the C-shaped compensation 14 is not large, the C-shaped compensation 14 is extruded through the micro channel 10, the first O-shaped floating ring 11 and the second O-shaped floating ring 12 are extruded through the excircle protrusion of the C-shaped compensation 14, so as to achieve the position compensation of the floating ring, namely when the air pressure in the hot cavity 2 is large, therefore, the first O-shaped floating ring 11 and the second O-shaped floating ring 12 can be in contact with the inner wall surface of the cylinder 1, so that the piston 5 and the convex top cavity 4 can be sealed in a double mode through the contact between the floating rings in the upper combined type sealing element 7 and the lower combined type sealing element 8 and the inner wall surface of the cylinder 1, and the sealing performance of the cylinder 1 is improved;
the through hole 9 is arranged in the top end of the piston 5, a micro channel 10 is arranged between the through hole 9 and the lower combined sealing element 8, a first O-shaped floating ring 11 is arranged in the upper combined sealing element 7, one end of the first O-shaped floating ring 11 is connected with a second O-shaped floating ring 12, the first O-shaped floating ring 11 and the second O-shaped floating ring 12 are both made of polytetrafluoroethylene materials, the polytetrafluoroethylene materials are generally called as 'non-stick coatings' or 'easy-to-clean materials', and the micro channel has the characteristics of acid and alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents; meanwhile, the polytetrafluoroethylene has the characteristic of high temperature resistance, the friction coefficient of the polytetrafluoroethylene is extremely low, the selection of the material effectively reduces the probability that scraps in the piston are adhered to the outer wall surface of the floating ring, and the friction force between the floating ring and the cylinder 1 is reduced through the low friction coefficient of the material, so that the floating ring is protected, and convenience is provided for the reciprocating movement work of the piston 5;
the first O-shaped floating ring 11 and the second O-shaped floating ring 12 are both arranged in the lower combined sealing element 8, the sections of the first O-shaped floating ring 11 and the second O-shaped floating ring 12 are both in a semi-trapezoidal barrel shape, the first O-shaped floating ring 11 is an open ring in an inclined opening form, the second O-shaped floating ring 12 is a closed ring, the arrangement of the semi-trapezoidal barrel shape of the section of the floating ring can reduce the friction force between the floating ring and the inner wall surface of the cylinder 1, so that the time for grinding the upper edge and the lower edge of the floating ring and the cylinder 1 is shortened, the damage to the inner wall surface of the cylinder 1 due to long-time high-pressure friction between the edge angle of the floating ring and the cylinder 1 is reduced, the probability of cylinder scuffing is reduced, the leather cup 13 is arranged at the inner circle of the second O-shaped floating ring 12, the leather cup 13 is arranged in the upper combined sealing element 7, and the leather cup 13 and the C-shaped compensation 14 are both made of fluorine rubber materials, have advantages such as high temperature resistant, resistant oil and resistant chemical erosion through fluororubber to can reduce the probability that leather cup 13 and C type compensation 14 receive external factor influence, thereby can carry out normal use in cylinder 1 inside of high temperature, with this to provide the guarantee to the normal operation of seal structure between cylinder 1 and the piston 5, the inside one end of lower combination formula sealing member 8 is provided with C type compensation 14, and the interior round department of C type compensation 14 is provided with arch 15.
In summary, in the combined piston seal, when the piston 5 moves upwards in the cylinder 1, the pressure inside the convex top cavity 4 is made to be higher, so that gas is conveyed to the inside of the lower combined seal 8 through the through hole 9 and the micro channel 10, and the C-shaped compensation 14 presses one end surfaces of the first O-shaped floating ring 11 and the second O-shaped floating ring 12, so that one end surface of the floating ring is in contact with the inner wall surface of the cylinder 1, and thus the sealing protection between the piston 5 and the convex top cavity 4 is realized;
and because the air pressure in the convex top cavity 4 is larger, the leather cup 13 is extruded by the air, so that the first O-shaped floating ring 11 and the second O-shaped floating ring 12 are contacted with the inner wall surface of the cylinder 1, secondary sealing protection is carried out between the piston 5 and the convex top cavity 4, the sealing performance of the cylinder 1 can be ensured through the mutual matching between the upper combined sealing element 7 and the lower combined sealing element 8, and the friction force between the floating ring and the inner wall surface of the cylinder 1 can be reduced through the arrangement of the semi-trapezoidal barrel-shaped cross section of the floating ring, so that the grinding time between the upper and lower edges of the floating ring and the cylinder 1 can be shortened, the damage to the inner wall surface of the cylinder 1 due to long-time high-pressure friction between the edges of the floating ring and the cylinder 1 can be reduced, the probability of cylinder pulling phenomenon can be reduced, and through the arrangement of the micro-small holes 3, the thermal chamber 2 is communicated with the convex top cavity 4, so that the stability of the air pressure between the thermal chamber and the convex top cavity is maintained, and the using process of the combined piston sealing element is completed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A combination piston seal, includes cylinder (1), hot chamber (2) and through-hole (9), its characterized in that: the inside of cylinder (1) is provided with protruding top cavity (4), and the bottom of protruding top cavity (4) is connected with piston (5), the inside miniature aperture (3) that is provided with in top of protruding top cavity (4), hot chamber (2) set up in the top of protruding top cavity (4), the outer wall surface of piston (5) is provided with guide ring (6), and the below of guide ring (6) is provided with combination formula sealing member (7), the below of going up combination formula sealing member (7) is provided with down combination formula sealing member (8), and goes up combination formula sealing member (7) and set up respectively in the inside of piston (5) outer wall surface with lower combination formula sealing member (8), through-hole (9) set up inside the top of piston (5), and be provided with between through-hole (9) and lower combination formula sealing member (8) miniature passageway (10), it includes first O type floating ring (11) to go up combination formula sealing member (7), The sealing device comprises a second O-shaped floating ring (12) and a leather cup (13), one end of the first O-shaped floating ring (11) is connected with the second O-shaped floating ring (12), the leather cup (13) is installed at the inner circle of the second O-shaped floating ring (12), the lower combined sealing piece (8) comprises a C-shaped compensation (14), a third O-shaped floating ring (16) and a fourth O-shaped floating ring (17), the C-shaped compensation (14) is installed at the inner circle of the third O-shaped floating ring (16), and a bulge (15) is arranged at the outer circle of the C-shaped compensation (14).
2. The composite piston seal of claim 1 wherein: the outer wall surface of the leather cup (13) is attached to the inner wall surface of the first O-shaped floating ring (11).
3. The composite piston seal of claim 1 wherein: the outer circle of the C-shaped compensation (14) in the lower combined type sealing element (8) is provided with a plurality of protrusions (15), the lower combined type sealing element (8) is connected to the inner part of the convex top cavity (4) through a micro channel (10), and the convex top cavity (4) is communicated with the piston hot cavity (2) through a micro small hole (3).
4. The composite piston seal of claim 1 wherein: the first O-shaped floating ring (11) and the second O-shaped floating ring (12) are both made of polytetrafluoroethylene materials.
5. The composite piston seal of claim 1 wherein: the cross sections of the first O-shaped floating ring (11) and the second O-shaped floating ring (12) are both in a semi-trapezoidal barrel surface shape, the first O-shaped floating ring (11) is an open ring in an oblique opening form, and the second O-shaped floating ring (12) is a closed ring.
6. The composite piston seal of claim 1 wherein: the leather cup (13) and the C-shaped compensation (14) are both made of fluororubber materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910171369.1A CN109737204B (en) | 2019-03-07 | 2019-03-07 | Combined piston sealing element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910171369.1A CN109737204B (en) | 2019-03-07 | 2019-03-07 | Combined piston sealing element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109737204A CN109737204A (en) | 2019-05-10 |
| CN109737204B true CN109737204B (en) | 2020-10-02 |
Family
ID=66369744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910171369.1A Expired - Fee Related CN109737204B (en) | 2019-03-07 | 2019-03-07 | Combined piston sealing element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109737204B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3806137A (en) * | 1970-03-04 | 1974-04-23 | Ramsey Corp | Resilient plastic piston ring |
| DE2753336A1 (en) * | 1977-11-30 | 1979-05-31 | Festo Maschf Stoll G | SEALING ARRANGEMENT FOR MUTUAL SEALING OF PARTS THAT ARE CONCENTRICALLY ARRANGED TO EACH OTHER AND RELATIVELY MOVABLE TO EACH OTHER IN AN AXIAL DIRECTION |
| JPH11148554A (en) * | 1997-11-14 | 1999-06-02 | Shoichi Iwamoto | One-way type sealing device |
| CN101482179A (en) * | 2008-01-08 | 2009-07-15 | 北京纽希液压技术研究所 | Multi-n shaped sealing device |
-
2019
- 2019-03-07 CN CN201910171369.1A patent/CN109737204B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3806137A (en) * | 1970-03-04 | 1974-04-23 | Ramsey Corp | Resilient plastic piston ring |
| DE2753336A1 (en) * | 1977-11-30 | 1979-05-31 | Festo Maschf Stoll G | SEALING ARRANGEMENT FOR MUTUAL SEALING OF PARTS THAT ARE CONCENTRICALLY ARRANGED TO EACH OTHER AND RELATIVELY MOVABLE TO EACH OTHER IN AN AXIAL DIRECTION |
| JPH11148554A (en) * | 1997-11-14 | 1999-06-02 | Shoichi Iwamoto | One-way type sealing device |
| CN101482179A (en) * | 2008-01-08 | 2009-07-15 | 北京纽希液压技术研究所 | Multi-n shaped sealing device |
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| Publication number | Publication date |
|---|---|
| CN109737204A (en) | 2019-05-10 |
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Granted publication date: 20201002 Termination date: 20210307 |