CN112682384A - Low-abrasion sealing device for piston hole of oil cylinder barrel - Google Patents
Low-abrasion sealing device for piston hole of oil cylinder barrel Download PDFInfo
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- CN112682384A CN112682384A CN202011591425.6A CN202011591425A CN112682384A CN 112682384 A CN112682384 A CN 112682384A CN 202011591425 A CN202011591425 A CN 202011591425A CN 112682384 A CN112682384 A CN 112682384A
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- sealing
- lip
- oil cylinder
- cylinder barrel
- sealing ring
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Abstract
The invention discloses a low-abrasion sealing device for a piston hole of an oil cylinder barrel, which comprises a sealing ring body and a wear-resistant guide supporting ring, wherein the sealing ring body is arranged in a movable cold groove and sleeved on the inner wall of the oil cylinder barrel, the wear-resistant guide supporting ring is arranged on the inner side of the sealing ring body, the sealing ring body is a U-shaped sealing ring with an inner lip and an outer lip, the shape of the integral sealing section is similar to a Y shape, the inner lip is static sealing, the outer lip is dynamic sealing, and the inner lip and the outer lip are combined with the wear-resistant guide supporting ring to form UFf combined lip type sealing. The sealing ring body is made of polyurethane sealing rings, the sealing outer ring and the oil cylinder barrel hole wall are attached to the sealing lip in a sliding friction mode, then the polyformaldehyde guide ring is combined, and due to the combination, the friction pair has stable and lower friction resistance when running at heavy load, high pressure and high and low speed due to the precise size structure and physical performance, so that the problems of low-speed crawling and high-speed heating efficiency of the oil cylinder are solved.
Description
Technical Field
The invention relates to the technical field of hydraulic sealing, in particular to a low-abrasion sealing device for a piston hole of an oil cylinder barrel of an actuating component in a hydraulic system in various industrial fields such as engineering machinery, construction machinery, automobile vehicles, military industry and the like.
Background
The oil cylinder barrel is an execution part in a hydraulic system in various industrial fields such as engineering machinery, construction machinery, automobile vehicles, military industry and the like, the consumption of the oil cylinder barrel is large, the specifications of shaft/hole sealing are various when the oil cylinder barrel reciprocates, wherein a lip-shaped sealing ring for reciprocating motion of a commonly used piston hole is a Y-shaped sealing ring because the lip is U-shaped and the shape of the sealing section is Y-shaped, the sealing ring is a Y-shaped sealing ring and is a U-shaped sealing ring also known by foreign famous manufacturers, and a plurality of series specifications and varieties are derived because the pressure, the speed and the load of the working parts are different. When the oil cylinder barrel with the sealing is installed and used to carry out the lowest starting pressure test under no-load and low pressure according to the relevant standard, the pressure value is very low and meets the standard specified value, but the friction resistance is very large when heavy load, namely high-pressure and high-speed movement, so that the mechanical efficiency of the oil cylinder is low, and the problem is to be solved urgently.
The traditional UY-shaped sealing element enables the lip to be in contact with an inner hole of the oil cylinder barrel due to the deformation of installation interference, when hydraulic pressure (oil pressure) is added, the sealing is deformed due to the elastic body, so that the whole sliding surface and the inner surface of the oil cylinder barrel are completely attached together, and when the oil pressure P is changed from 0-40MPa, the frictional resistance is greatly increased during the movement of a piston, so that the problems of heating, abrasion, crawling and the like are caused.
Disclosure of Invention
The technical problem is as follows: the invention aims to overcome the defects in the prior art and provides the low-abrasion sealing device for the piston hole of the oil cylinder barrel, which has a compact structure and a good using effect.
The technical scheme is as follows: the invention relates to a low-friction sealing device for a piston hole of an oil cylinder barrel, which comprises a sealing ring body which is arranged in a cold groove and sleeved on the inner wall of the oil cylinder barrel, wherein the sealing ring body is a sealing ring with a lip similar to a U shape, an integral sealing section similar to a Y shape and an inner lip and an outer lip UY shape, the inner lip is static sealing, the outer lip is dynamic sealing, a wear-resistant guide supporting ring is embedded at the rear part of the sealing lip of the sliding friction between the sealing ring body of the inner lip and the sealing ring body of the outer lip and the inner wall of the oil cylinder barrel, and a UYf combined lip type seal is formed by combination.
The sealing ring body is made of Polyurethane (PV) elastomer materials and is manufactured in a cylindrical tubular form through numerical control turning.
The wear-resistant guide supporting ring is made of Polyformaldehyde (POM) hard engineering plastics through numerical control precision turning, and a Z-shaped notch which is fastened without a gap is arranged in the middle of the wear-resistant guide supporting ring.
The diameter D of the outer lip of the sealing ring bodyOuter lipInner lip diameter DInner lipThe height h of the sealing ring body, the difference L1 of the heights of the inner lip and the outer lip and the arc transition chamfer R of the heel part of the inner lip are determined according to the width and the inner diameter of the sealing installation groove determined by the working condition of the working load on the piston, so that a series of specifications is formed.
The outer diameter D and the inner diameter D of the wear-resistant guide supporting ring are determined according to the inner diameter of the oil cylinder barrel to form a series of specification and dimension, and the thickness calculation formula of the wear-resistant guide supporting ring is as follows:
the wear-resistant guide supporting ring is in transition fit with the oil cylinder body, and the transition fit forms a friction pair combination according to the size chain.
Has the advantages that: by adopting the technical scheme, the problem of large frictional resistance in high-pressure and high-speed movement is solved, the novel low-friction hole is sealed by the UYf type, the polyformaldehyde guide ring is combined after the sealing inner ring and the oil cylinder barrel are attached to the sealing lip in a sliding friction mode, and the problem of large frictional resistance in high-pressure and high-speed movement in heavy load is solved. And the problems that when the lip is contacted with the oil cylinder barrel due to the deformation of the installation interference magnitude of the traditional UY-shaped sealing element, hydraulic pressure or oil pressure can lead the sealing to be deformed due to the elastic body, so that the whole sliding surface is completely attached to the surface of the oil cylinder barrel, and the friction resistance is large when the piston rod moves in the process of changing the oil pressure P from 0-40MPa, so that the heating, the abrasion, the crawling and the like are solved. The guide supporting ring with the hard and inelastic opening and good physical performance is combined behind the elastic lip, although the guide supporting ring is increased under the high-pressure contact pressure stress, the guide supporting ring does not creep at the high-speed, high-speed and low-speed heavy-load high-pressure due to the small and stable friction coefficient of the guide supporting ring and the sliding friction surface of the oil cylinder barrel, the guide supporting ring has small friction resistance at the high speed, high mechanical efficiency and small heat productivity, and therefore the service life is long.
Drawings
FIG. 1 is a block diagram of the present invention.
FIG. 2 is a dimensional structure diagram of the guide support ring of the present invention.
Fig. 3 is a structural dimension relation diagram of the sealing installation embodiment of the invention.
FIG. 4 is a schematic diagram showing the distribution of the contact pressure stress of the sliding friction pair of the seal and the oil cylinder barrel.
In the figure: 1-a sealing ring body, 2-a wear-resistant guide supporting ring, 3-an oil cylinder barrel, 4-a wear-resistant ring, 5-a piston, 6-an O-shaped sealing ring, 7-a piston rod, 8-a nut and 9-a gasket.
Detailed Description
An embodiment of the invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the low-friction sealing device for the piston hole of the oil cylinder barrel comprises a sealing ring body 1 which is arranged in a piston groove and sleeved on the inner wall of the oil cylinder barrel, wherein the sealing ring body 1 is a sealing ring with a U-shaped lip, a Y-shaped integral sealing section and an UY-shaped inner lip and an UY-shaped outer lip, the inner lip is static seal, the outer lip is dynamic seal, a wear-resistant guide supporting ring 2 is embedded at the rear part of the sealing lip, which is in sliding friction between the sealing ring body of the inner lip and the outer lip and the inner wall of the oil cylinder barrel 3, and the combination of the sealing ring body and the sealing lip is UYf combined lip. The sealing ring body 1 is made of Polyurethane (PV) elastomer materials and is manufactured in a cylindrical tubular form through numerical control turning. The wear-resistant guide supporting ring 2 is made of Polyformaldehyde (POM) hard engineering plastics through numerical control precision turning, and a Z-shaped notch which is fastened without a gap is arranged in the middle. The wear-resistant guide supporting ring 2 is in transition fit with the oil cylinder body 3, and the transition fit forms a friction pair combination according to a size chain.
The diameter D of the outer lip of the sealing ring bodyOuter coverInner lip diameter DInner partThe inner diameter of the oil cylinder barrel is determined, a series of specifications is formed, the width H of the sealing ring body, the difference L1 of the widths of the inner lip and the outer lip, and the arc transition chamfer R of the heel part of the inner lip are determined according to the width of a sealing groove set on the piston, and the series of specifications is formed.
The outer diameter D and the inner diameter D of the wear-resistant guide supporting ring are determined according to the inner diameter of the oil cylinder barrel to form a series of specification and dimension, and the thickness calculation formula of the wear-resistant guide supporting ring is as follows:
according to the diameter D of the sealing piston and the weight of the load, the thickness delta value of the wear-resistant guide supporting ring is generally 1.5-4mm, and the fit precision of a friction pair of the wear-resistant guide supporting ring 2 and the piston in an installation no-load state is determined to be in transition fit.
The wear-resistant guide supporting ring 2 is in transition fit with the oil cylinder barrel 3, the transition fit forms a friction pair combination according to a size chain, and the height L of the wear-resistant guide supporting ring 2 is determined according to the size from the arc transition chamfer R to the end part of the outer lip heel part of the combined sealing ring body 1.
The hole composed of the seal ring body 1 and the wear-resistant guide support ring 2 is arranged in an open or closed groove of the piston 5 in a sealing way, as shown in figure 3, the inner diameter of the open or closed groove of the piston is phi dH, the outer diameter of the open or closed groove of the piston is phi Dh, and the width of the open or closed groove of the piston is H1 which is set according to the size requirements of the oil cylinder barrel 3 and the piston 5. The interference magnitude of each sealing lip is optimally designed and selected according to the specification size of the working pressure load condition. When sealing, the value of the root extrusion gap g is related to the working pressure of the oil cylinder barrel and the diameter of the piston, and is generally 0.2-0.4 mm.
UYf the lip seal is made of specific structural dimension materials according to the output force of the oil cylinder and the diameter of the oil cylinder barrel, and is analyzed and determined according to the comprehensive factors such as the highest pressure, the maximum movement speed and the lowest stable speed of the system work, the frequency of the stable use of the load, the environmental temperature and the like.
The nominal size of the oil cylinder seal corresponds to the size of the mounting groove cavity of the piston and is phi dH, phi Dh and H1; d is the diameter of the piston, and has related international ISO standard, and general engineering machinery series D is 40-300mm dozens of specifications;
D-Dh is the large inner diameter of the mounting cavity, the related standards of pistons with the same diameter have different specifications, the diameter D-D/2 is the width of a sealing section, and generally 3-6 specifications are provided, so that the piston is suitable for heavy load, and the specifications of wide surfaces are generally selected.
FIG. 4 is a schematic diagram showing a comparison of the contact pressure stress distribution of the seal and oil cylinder sliding friction pair of the present invention, wherein FIG. 4 (a)1) FIG. 4 (b) is a schematic view showing the contact pressure stress when the conventional lip type seal ring is assembled with the piston1) Is a schematic view of the contact pressure stress when the conventional lip-shaped seal ring and the oil cylinder are stressed, and is shown in FIG. 4 (c)1) The schematic diagram of the contact pressure stress when the conventional lip-shaped sealing ring and the oil cylinder barrel are in an oil pressure state is shown; FIG. 4 (a)2) FIG. 4 (b) is a schematic view of the contact pressure stress of the UYf combined lip type seal ring during the assembly with the piston according to the present invention2) Is a schematic view of the contact pressure stress when the UYf combined lip-type seal ring and the oil cylinder barrel are stressed, fig. 4 (c)2) The invention is a contact pressure stress diagram of UYf combined lip type sealing ring and oil cylinder under oil pressure state. The invention improves the problem of large friction resistance during high-pressure and high-speed movement, and has obvious advantages when being used for crane amplitude variation, telescopic oil cylinders, low-speed unstable heavy-load working conditions and heavy-load high-pressure high-speed oil cylinders.
Claims (6)
1. The utility model provides a low friction sealing device is used to oil cylinder section of thick bamboo piston hole which characterized in that: the oil cylinder sealing structure comprises a sealing ring body (1) which is arranged in a movable cold groove and sleeved on the inner wall of an oil cylinder barrel, wherein the sealing ring body (1) is a sealing ring with a lip similar to U shape and an integral sealing section similar to Y shape and provided with an inner lip and an outer lip UY shape, the inner lip is static sealing, the outer lip is dynamic sealing, a wear-resistant guide supporting ring (2) is embedded at the rear part of the sealing ring body of the inner lip and the outer lip and the sliding friction of the inner wall of the oil cylinder barrel, and the combination of the sealing ring body and the sealing ring body forms UYf combined lip type.
2. A low friction seal assembly for the piston bore of an oil cylinder barrel as defined in claim 1, wherein: the sealing ring body (1) is made of Polyurethane (PV) elastomer materials and is manufactured in a cylindrical tubular form through numerical control turning.
3. A low friction seal assembly for the piston bore of an oil cylinder barrel as defined in claim 1, wherein: the wear-resistant guide supporting ring (2) is made of Polyformaldehyde (POM) hard engineering plastics through numerical control precision turning, and a Z-shaped notch which is fastened without a gap is arranged in the middle.
4. A low friction seal assembly for the piston bore of an oil cylinder barrel as defined in claim 1 or 2 wherein: the diameter D of the outer lip of the sealing ring body (1)Outer lipInner lip diameter DInner lipThe height h of the sealing ring body (1), the difference L1 of the heights of the inner lip and the outer lip, and the arc transition chamfer R of the heel part of the inner lip are determined according to the width and the inner diameter of the sealing installation groove determined by the working load working condition on the piston, so that a series of specifications is formed.
5. A low friction seal assembly for the piston bore of an oil cylinder barrel as defined in claim 1 or 3 wherein: the outer diameter D and the inner diameter D of the wear-resistant guide supporting ring (2) are determined according to the inner diameter of the oil cylinder barrel to form a series of specification and size, and the thickness calculation formula of the wear-resistant guide supporting ring (2) is as follows:
6. a low friction seal assembly for the piston bore of an oil cylinder barrel as defined in claim 1 or 3 wherein: the wear-resistant guide supporting ring (2) is in transition fit with the oil cylinder body (3), and the transition fit forms a friction pair combination according to a size chain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011591425.6A CN112682384A (en) | 2020-12-29 | 2020-12-29 | Low-abrasion sealing device for piston hole of oil cylinder barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011591425.6A CN112682384A (en) | 2020-12-29 | 2020-12-29 | Low-abrasion sealing device for piston hole of oil cylinder barrel |
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| Publication Number | Publication Date |
|---|---|
| CN112682384A true CN112682384A (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011591425.6A Pending CN112682384A (en) | 2020-12-29 | 2020-12-29 | Low-abrasion sealing device for piston hole of oil cylinder barrel |
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| CN (1) | CN112682384A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2526603Y (en) * | 2001-08-20 | 2002-12-18 | 李勇涛 | Semi-armoured sealer |
| CN206830815U (en) * | 2017-05-27 | 2018-01-02 | 上海唯万密封科技有限公司 | A kind of piston seal of automobile Horizontal hydraulic jack |
| CN210484612U (en) * | 2019-09-26 | 2020-05-08 | 优泰科(苏州)密封技术有限公司 | Single-acting piston sealing ring |
-
2020
- 2020-12-29 CN CN202011591425.6A patent/CN112682384A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2526603Y (en) * | 2001-08-20 | 2002-12-18 | 李勇涛 | Semi-armoured sealer |
| CN206830815U (en) * | 2017-05-27 | 2018-01-02 | 上海唯万密封科技有限公司 | A kind of piston seal of automobile Horizontal hydraulic jack |
| CN210484612U (en) * | 2019-09-26 | 2020-05-08 | 优泰科(苏州)密封技术有限公司 | Single-acting piston sealing ring |
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