CN2760342Y - Pressure compensation type hydraulic cylinder sealing device - Google Patents
Pressure compensation type hydraulic cylinder sealing device Download PDFInfo
- Publication number
- CN2760342Y CN2760342Y CN 200420056734 CN200420056734U CN2760342Y CN 2760342 Y CN2760342 Y CN 2760342Y CN 200420056734 CN200420056734 CN 200420056734 CN 200420056734 U CN200420056734 U CN 200420056734U CN 2760342 Y CN2760342 Y CN 2760342Y
- Authority
- CN
- China
- Prior art keywords
- hydraulic cylinder
- rubber ring
- sealing
- pressure
- sealing device
- 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.)
- Expired - Fee Related
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- Actuator (AREA)
- Sealing Devices (AREA)
Abstract
The utility model relates to a pressure compensation type hydraulic cylinder sealing device which is composed of a rubber ring provided with an inner cavity and a polytetrafluoroethylene sealing sleeve coated over the rubber ring, wherein hole passages communicating the inner cavity of the rubber ring with a hydraulic cylinder are arranged on the sealing sleeve and the rubber ring. In the hydraulic cylinder sealing device adopting the structure, the object contacts a cylinder lever and has the sealing action is not the rubber ring but the polytetrafluoroethylene sealing sleeve coated over the rubber ring. Hydraulic media in the hydraulic cylinder is charged into the inner cavity of the rubber ring through the hole passage. When the utility model is in operation, the pressure thereof enables the rubber ring to expand to enable the pressure to be transferred to the sealing sleeve has a definite elasticity, and the polytetrafluoroethylene sealing sleeve can forms a pressure contact with the cylinder level; the polytetrafluoroethylene sealing sleeve has the sealing action. The pressure of the media is higher, the contact pressure is larger and the sealing effect is better.
Description
Technical field
The present invention relates to hydraulic equipment, particularly a kind of hydraulic cylinder sealing device with pressure compensation.
Background technique
It is difform rubber seal that existing hydraulic cylinder sealing is continued to use the cross section always, reach sealing effect by cushion rubber self elasticity, and the shortcoming of this kind sealing is to wear no resistance, and easily aging distortion, thus its poor sealing performance, and working life is low.
Summary of the invention
The purpose of this invention is to provide a kind of wear resistance good, be difficult for pressure-compensated hydraulic cylinder sealing device aging, good seal performance.
For achieving the above object, the present invention is made of cushion rubber that has inner chamber and the teflon seal cover that surrounds this cushion rubber, and the duct that is communicated with cushion rubber inner chamber and oil hydraulic cylinder is arranged on stuffing box gland and the cushion rubber.
Adopt the hydraulic cylinder sealing device of said structure, contacting with the cylinder bar, what seal is not cushion rubber, but the teflon seal cover of encirclement cushion rubber, the hydraulic medium passing hole channel charges into the cushion rubber inner chamber in the oil hydraulic cylinder, during work, its pressure expands cushion rubber, and propagation of pressure is given certain flexible teflon seal cover, make itself and cylinder bar form pressure and contact, play seal action.Pressure medium is high more, and then contact pressure is big more, and sealing effect is good more.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is a pressure-compensated hydraulic cylinder sealing device partial sectional view of the present invention.
Embodiment
By shown in Figure 1, pressure-compensated hydraulic cylinder sealing device of the present invention, its cushion rubber 4 that has inner chamber 5 places by the teflon seal cover 2 of front and back two-part to being connected into, sealing cover outside dimensions is consistent with the Sealing groove of oil hydraulic cylinder casing wall 1 inboard, its internal diameter has a little amount of being full of than cylinder bar 7 diameters, offer one group of duct 3 that communicates with the cushion rubber inner chamber at its leading flank, and the duct circle segment is slightly sunk, thereby form the gap with cell wall.Be filled in the Sealing groove after whole sealing device assembled, hydraulic medium can charge into the cushion rubber inner chamber by the gap and the duct 3 of gap, stuffing box gland and the trench wall of casing wall and cylinder bar.6 is dust ring among the figure.
Claims (1)
1, a kind of pressure-compensated hydraulic cylinder sealing device, it is characterized in that: the cushion rubber (4) that will have inner chamber (5) places by the teflon seal cover (2) of front and back two-part to being connected into, sealing cover outside dimensions is consistent with the Sealing groove of oil hydraulic cylinder casing wall (1) inboard, its internal diameter has a little amount of being full of than cylinder bar (7) diameter, offer one group of duct that communicates with the cushion rubber inner chamber (3) at its leading flank, and the duct circle segment is slightly sunk, be filled in the Sealing groove after whole sealing device assembled, hydraulic medium is by the gap of casing wall and cylinder bar, the gap of stuffing box gland and trench wall and duct (3) can charge into the cushion rubber inner chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420056734 CN2760342Y (en) | 2004-12-13 | 2004-12-13 | Pressure compensation type hydraulic cylinder sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420056734 CN2760342Y (en) | 2004-12-13 | 2004-12-13 | Pressure compensation type hydraulic cylinder sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2760342Y true CN2760342Y (en) | 2006-02-22 |
Family
ID=36082544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420056734 Expired - Fee Related CN2760342Y (en) | 2004-12-13 | 2004-12-13 | Pressure compensation type hydraulic cylinder sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2760342Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777607A (en) * | 2012-07-30 | 2012-11-14 | 昆山科信橡塑机械有限公司 | Hydraulic sealing device for shaft end of internal mixing rotor of internal mixer |
| CN103174836A (en) * | 2013-03-14 | 2013-06-26 | 自贡鑫剑密封科技有限公司 | Graphite packing loop and seal assembly thereof |
| CN104214254A (en) * | 2014-08-28 | 2014-12-17 | 南车眉山车辆有限公司 | Brake cylinder piston assembly for railway vehicle |
-
2004
- 2004-12-13 CN CN 200420056734 patent/CN2760342Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777607A (en) * | 2012-07-30 | 2012-11-14 | 昆山科信橡塑机械有限公司 | Hydraulic sealing device for shaft end of internal mixing rotor of internal mixer |
| CN102777607B (en) * | 2012-07-30 | 2015-04-22 | 昆山科信橡塑机械有限公司 | Hydraulic sealing device for shaft end of internal mixing rotor of internal mixer |
| CN103174836A (en) * | 2013-03-14 | 2013-06-26 | 自贡鑫剑密封科技有限公司 | Graphite packing loop and seal assembly thereof |
| CN103174836B (en) * | 2013-03-14 | 2015-09-30 | 四川理工学院 | A kind of graphite packing circle and black box thereof |
| CN104214254A (en) * | 2014-08-28 | 2014-12-17 | 南车眉山车辆有限公司 | Brake cylinder piston assembly for railway vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |