CN113027858A - Novel piston sealing device - Google Patents
Novel piston sealing device Download PDFInfo
- Publication number
- CN113027858A CN113027858A CN202110375824.7A CN202110375824A CN113027858A CN 113027858 A CN113027858 A CN 113027858A CN 202110375824 A CN202110375824 A CN 202110375824A CN 113027858 A CN113027858 A CN 113027858A
- Authority
- CN
- China
- Prior art keywords
- sealing
- section
- shaped rubber
- groove
- support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 71
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 21
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 21
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 abstract description 7
- 238000007906 compression Methods 0.000 abstract description 7
- 238000009434 installation Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3224—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip capable of accommodating changes in distances or misalignment between the surfaces, e.g. able to compensate for defaults of eccentricity or angular deviations
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sealing Devices (AREA)
Abstract
The invention provides a novel piston sealing device, which comprises an elastic compensation support, an elastic compensation O-shaped rubber ring, a polytetrafluoroethylene guide ring and two sealing O-shaped rubber rings, wherein the elastic compensation support, the elastic compensation O-shaped rubber ring, the polytetrafluoroethylene guide ring and the two sealing O-shaped rubber rings are sleeved in a piston sealing groove, the middle of the elastic compensation support is provided with a semicircular groove, the left side surface and the right side surface are respectively provided with a microcosmic bulge which is uniformly distributed, the elastic compensation O-shaped rubber ring is sleeved in the semicircular groove, the polytetrafluoroethylene guide ring is sleeved outside the elastic compensation O-shaped rubber ring, the section of the polytetrafluoroethylene guide ring consists of a sealing support section and a middle guide section which are arranged on the left side and the right side, the sealing support section and the middle guide section are smoothly manufactured through two deformed arc sections, the outer compression surface of the sealing support section and the deformed arc sections form a deformed groove with a U-shaped profile, and the sealing O-shaped rubber ring is sleeved in the deformed groove. The invention has wide application range, strong sealing compensation capability, small friction force, good sealing performance and long service life.
Description
Technical Field
The invention relates to a driving hydraulic cylinder of hydraulic machinery, in particular to a novel piston sealing device.
Background
The driving hydraulic cylinder is an actuating element in hydraulic machinery, and the piston seal of the hydraulic cylinder belongs to reciprocating seal, so that the sealing between the piston and a cylinder body is mainly realized, the internal leakage of hydraulic oil is prevented, and the driving hydraulic cylinder plays an important role in the motion performance and the sensitivity of the hydraulic cylinder. The piston seal usually adopts the structure of two lip-shaped elastic seal combinations or the combination of a polytetrafluoroethylene guide ring and an O-shaped rubber ring, the lip of the elastic seal directly contacts with the cylinder body wall, the friction force during relative motion is large, the service life of the elastic seal is shortened, and after the combined seal of the latter runs for a long time, the elastic deformation capacity of the O-shaped rubber ring can be weakened, so that the contact stress between the polytetrafluoroethylene guide ring and the cylinder body wall is reduced, oil leakage is easily caused, and the working performance of the hydraulic cylinder is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the existing piston seal, and provides a novel piston sealing device which can reduce the friction force when a piston moves, improve the sealing performance, prolong the service life of the seal and improve the reliability of the seal under heavy-load working conditions.
The technical problem to be solved by the invention is realized by the following technical scheme:
the utility model provides a novel piston seal device, this sealing device include elasticity compensation support, elasticity compensation O type rubber circle, polytetrafluoroethylene guide ring, two sealed O type rubber circles of suit in the piston seal groove, the system has semicircular groove in the middle of the elasticity compensation support, and left and right two side systems have evenly distributed's microcosmic arch, elasticity compensation O type rubber circle suit is in this semicircular groove, polytetrafluoroethylene guide ring suit is outside this elasticity compensation O type rubber circle, and this polytetrafluoroethylene guide ring cross-section comprises the sealed support section and the middle guide section of left and right both sides, and this sealed support section is made through warping the arc section level and smooth with middle guide section, and the outer face that receives of sealed support section forms the deformation groove that the profile is "U-shaped", sealed O type rubber circle suit is in this deformation groove.
And the left side surface and the right side surface of the elastic compensation support are compression surfaces, and the surface of the semicircular groove is a compression surface. When the two side surfaces are pressed, the elastic compensation support is deformed, the elastic compensation O-shaped rubber ring is extruded through the surface of the semicircular groove, the stress of the contact part of the middle guide section and the cylinder body wall is increased, and the sealing performance is improved.
And the microcosmic bulges manufactured on the left side surface and the right side surface are in the shape of short cylinders, the diameter of each microcosmic bulge is 3mm, the height of each microcosmic bulge is 0.2mm, the number of the microcosmic bulges is 24, the microcosmic bulges are uniformly distributed along the central circumference of the side surfaces, the installation prepressing force can be increased, lubricating oil can be stored among the microcosmic bulges during working, enough contact pressure among sealing surfaces is continuously kept, and the sealing performance is improved.
And the section radius of the elastic force compensation O-shaped rubber ring is the same as the radius of the semicircular groove, so that the elastic force compensation O-shaped rubber ring is prevented from twisting.
And the sealing support sections and the middle guide section on the left side and the right side of the polytetrafluoroethylene guide ring are manufactured smoothly through deformed circular arc sections.
And the outer pressure-bearing surface of the sealing support section is a force application part, the deformed arc section is a deformed part, and when the outer pressure-bearing surfaces on the left side and the right side are pressed, the U-shaped deformation grooves and the deformed arc sections on the left side and the right side are deformed, so that the middle guide section is upwards jacked, the pressure between the middle guide section and the cylinder wall is increased, and the sealing reliability is improved.
And the deformation arc section and the middle guide section form a deformation cavity, and the included angle between the middle guide section and the deformation arc section is 155 degrees, so that the deformation cavity can be uniformly deformed conveniently.
And the contact position of the sealing O-shaped rubber ring and the deformation groove is a pressurizing part, the upper part of the sealing O-shaped rubber ring is a sealing part, and when the outer pressure-bearing surface of the sealing support section is pressed, the deformation groove deforms and extrudes the sealing O-shaped rubber ring to deform the sealing O-shaped rubber ring, so that elastic sealing is realized.
The invention has the advantages and beneficial effects that:
the middle of the elastic compensation support is provided with a semicircular groove, the left side surface and the right side surface are compression surfaces, and are provided with micro bulges which are uniformly distributed, so that the prepressing force during initial installation can be increased, the surface of the semicircular groove is a pressure surface, the elastic compensation O-shaped rubber ring is sleeved in the semicircular groove, the section radius of the elastic compensation O-shaped rubber ring is the same as the radius of the semicircular groove, and the torsion of the elastic compensation O-shaped rubber ring is prevented.
The sealing support sections and the middle guide section on the left side and the right side of the polytetrafluoroethylene guide ring are smoothly manufactured through deformed circular arc sections, a sealing O-shaped rubber ring is sleeved in a deformed groove, the external pressure surface is a force application part, the deformed circular arc sections are deformed parts, and the deformed circular arc sections and the middle guide section form a deformed cavity. During operation, under the oil pressure effect, the external pressure surface is pressed, the U-shaped deformation grooves on the left side and the right side deform and extrude the sealing O-shaped rubber ring, the contact width between the sealing O-shaped rubber ring and the inner wall of the cylinder body is increased, the sealing performance is improved, meanwhile, the deformation arc section deforms, the middle guide section is upwards jacked, the contact stress between the polytetrafluoroethylene guide ring and the cylinder body is increased, the dynamic sealing performance during sealing operation is improved, and the reliability during sealing operation is improved.
The microcosmic bulges on the left side surface and the right side surface of the elastic compensation support can increase the pre-pressure during installation, lubricating oil can be stored between the microcosmic bulges during working, enough contact pressure between sealing surfaces can be continuously kept, and the sealing performance is improved.
The semicircular groove of the elastic compensation support can prevent the elastic compensation O-shaped rubber ring from twisting, and improves the sealing performance under the heavy load working condition.
The invention has scientific and reasonable design, strong sealing compensation capability, small friction force, good sealing performance and long service life.
Drawings
Fig. 1 is a schematic structural view of the present invention. Reference numbers and corresponding part names in the drawings:
1-piston, 2-elastic compensation support, 3-elastic compensation O-shaped rubber ring, 4-semicircular groove, 5-sealing support section, 6-sealing O-shaped rubber ring, 7-deformation groove, 8-external compression surface, 9-cylinder body, 10-deformation arc section, 11-middle guide section, 12-polytetrafluoroethylene guide ring and 13-deformation cavity.
Detailed Description
The implementation of the invention is further explained with the attached drawings.
A novel piston sealing device is used for sealing a gap between a piston 1 and a cylinder body 9, and comprises an elastic compensation support 2, an elastic compensation O-shaped rubber ring 3, a polytetrafluoroethylene guide ring 12 and two sealing O-shaped rubber rings 6 which are sleeved in a sealing groove of the piston 1, wherein a semicircular groove 4 is formed in the middle of the elastic compensation support 2, microcosmic bulges which are uniformly distributed are formed on the left side surface and the right side surface, the elastic compensation O-shaped rubber ring 3 is sleeved in the semicircular groove 4, the polytetrafluoroethylene guide ring 12 is sleeved outside the elastic compensation O-shaped rubber ring 3, the cross section of the polytetrafluoroethylene guide ring 12 is composed of a sealing support section 5 and a middle guide section 11 which are arranged on the left side and the right side surface, the sealing support section 5 and the middle guide section 11 are smoothly manufactured through a deformed circular arc section 10, and a deformed groove 7 with a U-shaped outline is formed by the outer surface 8 of the sealing support section 5 and the deformed circular arc section 10, the sealing O-shaped rubber ring 6 is sleeved in the deformation groove 7.
The left side surface and the right side surface of the elastic compensation support 2 are compression surfaces, and the surface of the semicircular groove 4 is a compression surface. In order to increase the pre-pressure during installation and the compensation force during operation, 24 short cylindrical microscopic protrusions with the diameter of phi 3mm and the height of 0.2mm are uniformly distributed on the left side surface and the right side surface, and after the elastic compensation support 2 is pressed and deformed, the elastic compensation O-shaped rubber ring 3 is extruded through the surface of the semicircular groove 4, so that the stress of the contact part of the middle guide section 11 and the inner wall of the cylinder body 9 is increased, and the sealing performance is improved.
The section radius of the elastic compensation O-shaped rubber ring 3 is the same as that of the semicircular groove 4, so that the elastic compensation O-shaped rubber ring 3 is prevented from twisting, and the sealing performance under heavy-load working conditions is improved.
The sealing support section 5 and the middle guide section 11 on the left side and the right side of the polytetrafluoroethylene guide ring 12 are smoothly manufactured through the deformed circular arc section 10, the outer pressed surface 8 of the sealing support section 5 is a force application part, in the working process, the U-shaped deformation groove 7 deforms under the action of oil pressure, the O-shaped rubber ring 6 is extruded and sealed to deform, elastic sealing is achieved, meanwhile, the deformed circular arc section 10 deforms, the middle guide section 11 is upwards jacked, the pressure between the middle guide section 11 and the inner wall of the cylinder body 9 is increased, the sealing reliability is improved, the deformed circular arc sections 10 and the middle guide section 11 on the left side and the right side form a deformed cavity 13, the included angle between the middle guide section 11 and the deformed circular arc section 10 is 155 degrees, and uniform deformation of the deformed cavity 13 is facilitated.
In conclusion, the novel piston sealing device disclosed by the invention is compact in structure and reasonable in design, can effectively compensate the contact stress of the sealing surface when a hydraulic cylinder runs, reduces the friction force when the piston runs in a sealing mode, improves the sealing reliability and sealing capacity of the piston under a heavy-load working condition, and prolongs the service life of the piston seal.
Claims (8)
1. The utility model provides a novel piston seal device, its characterized in that, includes elasticity compensation support, elasticity compensation O type rubber circle, polytetrafluoroethylene guide ring, two sealed O type rubber circles of suit in the piston seal groove, the system has semicircular groove in the middle of the elasticity compensation support, and left and right two side systems have evenly distributed's microcosmic arch, elasticity compensation O type rubber circle suit is in this semicircular groove, polytetrafluoroethylene guide ring suit is outside this elasticity compensation O type rubber circle, and this polytetrafluoroethylene guide ring cross-section comprises the sealed support section and the middle guide section of left and right both sides, and this sealed support section is made through warping the arc section level and smooth with middle guide section, and the outer face that receives of sealed support section forms the deformation groove that the profile is "U-shaped", sealed O type rubber circle suit is in this deformation inslot.
2. A novel piston seal assembly as claimed in claim 1 wherein said elastomeric compensation seat has pressure receiving surfaces on both the left and right sides and a pressure bearing surface on the surface of the semi-circular recess.
3. A novel piston seal according to claim 1 or 2 characterised in that the microscopic projections are in the form of short cylinders with a diameter of 3mm, a height of 0.2mm and a number of 24, evenly distributed along the central circumference of the side.
4. The novel piston seal of claim 1 wherein said spring force compensating O-ring has a cross-sectional radius equal to the radius of the semi-circular groove.
5. The novel piston sealing device as claimed in claim 1, wherein the sealing support sections and the middle guide section on the left and right sides of the polytetrafluoroethylene guide ring are smoothly manufactured through deformed circular arc sections.
6. A novel piston sealing device as claimed in claim 1 or 5, characterized in that the outer pressure-bearing surface of the sealing support section is a force-applying portion and the deformed circular arc section is a deformed portion.
7. A novel piston seal according to claim 1 or 5 characterised in that the deforming arc forms a deforming chamber with an intermediate guide section, the intermediate guide section being at an angle of 155 ° to the deforming arc.
8. The novel piston sealing device as claimed in claim 1, wherein the contact part of the sealing O-shaped rubber ring and the deformation groove is a pressurization part, and the upper part is a sealing part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110375824.7A CN113027858A (en) | 2021-04-07 | 2021-04-07 | Novel piston sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110375824.7A CN113027858A (en) | 2021-04-07 | 2021-04-07 | Novel piston sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113027858A true CN113027858A (en) | 2021-06-25 |
Family
ID=76454174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110375824.7A Pending CN113027858A (en) | 2021-04-07 | 2021-04-07 | Novel piston sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113027858A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118026026A (en) * | 2024-04-12 | 2024-05-14 | 山西泰宝科技有限公司 | Hydraulic support aqueous medium pushing jack sealing device |
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|---|---|---|---|---|
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-
2021
- 2021-04-07 CN CN202110375824.7A patent/CN113027858A/en active Pending
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| JPH08135795A (en) * | 1994-11-14 | 1996-05-31 | Nok Corp | Sealing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118026026A (en) * | 2024-04-12 | 2024-05-14 | 山西泰宝科技有限公司 | Hydraulic support aqueous medium pushing jack sealing device |
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