CN211778322U - Novel piston rod reciprocating seal assembly - Google Patents
Novel piston rod reciprocating seal assembly Download PDFInfo
- Publication number
- CN211778322U CN211778322U CN202020383461.2U CN202020383461U CN211778322U CN 211778322 U CN211778322 U CN 211778322U CN 202020383461 U CN202020383461 U CN 202020383461U CN 211778322 U CN211778322 U CN 211778322U
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- piston rod
- sealing ring
- annular groove
- seal assembly
- reciprocating seal
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- Pistons, Piston Rings, And Cylinders (AREA)
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Abstract
The utility model discloses a novel piston rod reciprocating seal subassembly, including setting up the sealing ring in the cylinder cap seal groove, the sealing ring cover is located on the piston rod, the inner peripheral surface that the sealing ring contacted with the piston rod is planar structure, outer peripheral face and is the annular groove, be provided with O type sealing washer in the annular groove, O type sealing washer and annular groove interference fit. The utility model discloses piston rod seal assembly mainly forms by O type sealing washer and the combination of modified polymer sealing ring, and frictional resistance is little, start fast and steady, operate steadily, do not have and creep, compact structure, do not have adhesion tendency, wear-resisting, high pressure resistant, shock-resistant, and sealed life, performance and reliability are showing and are improving.
Description
Technical Field
The utility model relates to a hydraulic machine's annex especially relates to a novel piston rod reciprocating seal subassembly.
Background
In a hydraulic sealing system, an O-ring is usually used to seal between a piston rod and a cylinder head. However, the O-shaped sealing ring which is directly contacted with the piston rod is arranged in the sealing groove of the cylinder cover, the O-shaped sealing ring is easily extruded into the sealing gap to cause gap bite and distortion phenomenon during movement under high pressure and alternating pressure, and the sealing service life and the reliability are to be improved.
Therefore, when the sealing pressure is larger, in order to ensure good sealing effect, the piston rod is sealed by adopting a structural form of an O-shaped sealing ring and a plastic check ring, and the sealing structure well solves the problem of rubber clearance bite. However, because the sealing is realized by the interference contact of the O-shaped sealing ring and the piston rod, the friction coefficient between the rubber and the piston rod is higher under the reciprocating motion of the piston rod, and the 'Joule effect' is easily generated after the friction generates heat to cause the sealing failure, the service life is short, and the running cost is increased by frequent replacement.
SUMMERY OF THE UTILITY MODEL
To the technical problem mentioned above, the utility model aims at providing a novel piston rod reciprocating seal subassembly.
Therefore, the utility model adopts the following technical scheme:
the utility model provides a novel piston rod reciprocating seal subassembly, is including setting up the sealing ring in the cylinder cap seal groove, the sealing ring cover is located on the piston rod, the inner peripheral surface that the sealing ring contacted with the piston rod is planar structure, the outer peripheral face is the annular groove, be provided with O type sealing washer in the annular groove, O type sealing washer and annular groove interference fit.
The inner wall of the annular groove is of an arc structure matched with the O-shaped sealing ring.
The O-shaped sealing ring is processed by nitrile rubber or fluororubber.
The sealing ring is made of modified polytetrafluoroethylene materials.
The novel piston rod sealing assembly provided by the utility model is mainly formed by combining an O-shaped sealing ring and a modified polymer sealing ring, the planar structure part on the inner circumferential surface of the sealing ring is directly sleeved on the piston rod, the anti-adhesion capacity is strong in the reciprocating motion of the piston rod, the friction force is small, and the abrasion is light; an O-shaped sealing ring is arranged in the annular groove on the peripheral surface, and the O-shaped sealing ring is used as an elastic body to provide enough sealing pretightening force, has a compensation effect on the abrasion of the sealing ring and greatly improves the sealing performance. The novel piston rod sealing assembly has the advantages of small frictional resistance, quick and stable starting, stable operation, no crawling, compact structure, no adhesion tendency, wear resistance, high pressure resistance and impact resistance, and obviously improved sealing life, performance and reliability.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic structural view of the sealing ring of the present invention.
In the figure: 1-cylinder cover, 2-sealing groove, 3-sealing ring, 4-piston rod, 5-annular groove and 6-O-shaped sealing ring.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1 and 2, a novel piston rod reciprocating seal assembly comprises a seal ring 3 arranged in a seal groove 2 of a cylinder cover 1, the seal ring 3 is sleeved on a piston rod 4, the inner circumferential surface of the seal ring 3, which is in contact with the piston rod 4, is of a planar structure, the outer circumferential surface is an annular groove 5, an O-shaped seal ring 6 is arranged in the annular groove 5, the O-shaped seal ring 6 is in interference fit with the annular groove 5, and the inner wall of the annular groove 5 is of an arc-shaped structure matched with the O-shaped seal ring 6.
The piston rod is directly located to 3 inner peripheral surface planar structure departments of sealing ring cover 4, and the resistance to adhesion is strong in 4 reciprocating motion piston rod, and frictional force is little, and wearing and tearing are light to O type sealing washer 6 that sets up in outer peripheral face annular groove 5 can provide the resilience force, plays the compensatory action to the wearing and tearing of sealing ring 3, improves sealing performance by a wide margin, makes novel piston rod reciprocating seal subassembly's sealed life and reliability improve greatly, has reduced running cost.
The O-shaped sealing ring 6 adopts modified 26-type fluororubber, polyhydroxy compound bisphenol AF as a vulcanizing agent, benzyl triphenyl phosphorus chloride (BPP) as a co-accelerator, and carbon black and other reinforcing agents are filled to improve the mechanical property of the O-shaped sealing ring. It has excellent resilience and constant compression set (20% compression, 175 deg.c. multiplied by 24 hr hot air) less than 5%.
The sealing ring 3 is made of modified polytetrafluoroethylene materials, the friction coefficient is less than or equal to 0.25, the width of a grinding trace is less than or equal to 5.0mm (GB/T3960,200N, 200RPM), and the modified fillers are mainly one or a mixture of more of polyphenyl ester, polyimide, polyether ether ketone, nano silicon dioxide and glass fiber filled with polytetrafluoroethylene.
The utility model discloses a piston rod reciprocating seal subassembly is at-55 deg.C ~ 140 deg.C, operating pressure 28MPa, and the working medium is 15# aviation hydraulic oil, and reciprocating motion speed is under 0.125m/s, and sealed life-span reaches more than 3000 hours, improves more than 50% than current seal subassembly.
Claims (4)
1. The utility model provides a novel piston rod reciprocating seal subassembly which characterized in that: the sealing ring is arranged in a sealing groove of a cylinder cover, the sealing ring is sleeved on a piston rod, the inner circumferential surface of the sealing ring, which is in contact with the piston rod, is of a planar structure, the outer circumferential surface of the sealing ring is an annular groove, an O-shaped sealing ring is arranged in the annular groove, and the O-shaped sealing ring is in interference fit with the annular groove.
2. The novel piston rod reciprocating seal assembly of claim 1 wherein: the inner wall of the annular groove is of an arc structure matched with the O-shaped sealing ring.
3. The novel piston rod reciprocating seal assembly of claim 1 wherein: the O-shaped sealing ring is processed by nitrile rubber or fluororubber.
4. The novel piston rod reciprocating seal assembly of claim 1 wherein: the sealing ring is made of modified polytetrafluoroethylene materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020383461.2U CN211778322U (en) | 2020-03-24 | 2020-03-24 | Novel piston rod reciprocating seal assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020383461.2U CN211778322U (en) | 2020-03-24 | 2020-03-24 | Novel piston rod reciprocating seal assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211778322U true CN211778322U (en) | 2020-10-27 |
Family
ID=72933131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020383461.2U Active CN211778322U (en) | 2020-03-24 | 2020-03-24 | Novel piston rod reciprocating seal assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211778322U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216097A (en) * | 2021-05-06 | 2021-08-06 | 中国葛洲坝集团第一工程有限公司 | Jacking-free gate bottom pivot sealing element connecting tool and method |
| CN113216096A (en) * | 2021-05-06 | 2021-08-06 | 中国葛洲坝集团第一工程有限公司 | Jacking-free gate bottom pivot sealing element and in-situ maintenance method |
-
2020
- 2020-03-24 CN CN202020383461.2U patent/CN211778322U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216097A (en) * | 2021-05-06 | 2021-08-06 | 中国葛洲坝集团第一工程有限公司 | Jacking-free gate bottom pivot sealing element connecting tool and method |
| CN113216096A (en) * | 2021-05-06 | 2021-08-06 | 中国葛洲坝集团第一工程有限公司 | Jacking-free gate bottom pivot sealing element and in-situ maintenance method |
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