CN1815066B - Energized dynamic seal ring for piston rod - Google Patents
Energized dynamic seal ring for piston rod Download PDFInfo
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- CN1815066B CN1815066B CN 200510018269 CN200510018269A CN1815066B CN 1815066 B CN1815066 B CN 1815066B CN 200510018269 CN200510018269 CN 200510018269 CN 200510018269 A CN200510018269 A CN 200510018269A CN 1815066 B CN1815066 B CN 1815066B
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Abstract
The invention provides an active sealing ring for a piston rod, wherein the expansion effect is realized through the pressure of a medium arranged in a hydraulic cylinder or a pneumatic cylinder. Viewed from the axial section of the sealing ring, the sealing ring is a closed annular flexible sealing body. The axial cross section of the sealing ring adopts a cavity structure composed of an inner wall loop, left and right end faces and an outer wall loop. The sealing ring is capable of being integral construction or combinatorial structure. The outer wall loop end surface having penetration through hole and perforated groove. The invented static seal is two complete surface i.e. outer wall and one end surface with large tight surface, therefore having multiplexing sealing effect when static seal area multiplexing increased. Compared With current technology, said invention does not use support ring and screw adjusting mechanism, having reliable high and low pressure seal performance with simple structure and low cost, capable of being used on defective piston rod, and defective sealing such as piston rod having cladding material slough, scuffing, wearing, rust pit and deformation etc.
Description
Technical field
The present invention relates to moving seal ring for piston rod in a kind of oil hydraulic cylinder that is applied to the industries such as machinery, colliery, metallurgy and the pneumatic linear actuator, relate to the piston rod seal ring that a kind of pressure with medium obtains from inside to outside expansion.
Background technique
At present, in the piston rod motive sealing in known oil hydraulic cylinder or the pneumatic linear actuator, initial sealing all is to finish sealing function by sealed ring deformation extrusion piston bar, and all very high to size requirement and the surface requirements of piston rod.Along with the constantly creep of wearing and tearing and sealing ring material and aging of seal ring, the positive pressure between piston rod and the seal ring reduces gradually, and the initial sealing effect weakens gradually, finally comes to an end with seal failure.Published in 1998 " the various piston rod seal rings of introducing in the newly organized oilhydraulic engineering handbook, sealing principle is not always the case.Chinese invention patent application prospectus CN1194339A discloses a kind of ne-leakage oil hydraulic cylinder in 30 days September in 1998, with regard to sealing principle changed " method that provides in the newly organized oilhydraulic engineering handbook, tool characteristics be that sealing is reliable.But pass through practical proof, this kind seal ring has that liquid arrives in the seal groove by making the duct that communicates with pressure medium on the guide sleeve in a kind of ne-leakage oil hydraulic cylinder of the deficiency of himself: CN1194339A, then enter radial through holes on the support ring, form a complete sealing system entering the seal ring chamber.Under many circumstances, it is unallowed on the structure doing port hole at guide sleeve, or the conventional machining method is difficult to accomplish.With regard to the end face static seal, be to realize by the axial length that screw thread is adjusted the end face pressure ring in a kind of ne-leakage oil hydraulic cylinder of CN1194339A.In order to reach the condition of setting up sealing, also must in seal ring, install an axially support ring additional and transmit axial force.And the static seal face only the end face with support ring is identical, area is very little, thus just require to improve the machining accuracy on seal groove surface, to guarantee the reliability of static seal.Have in addition following deficiency: 1, the seal arrangement number of spare parts is many, and complex structure is compared a sealing position with traditional seal ring and had more three parts; 2, cost is high, because part is wide in variety, quantity is many and part is comparatively complicated again, so the sealing cost is higher.Above-mentioned deficiency plays certain negative effect to spread.
Summary of the invention
Goal of the invention of the present invention is to overcome the prior art deficiency and a kind of reliable high low pressure sealability that has is provided, the moving seal ring for piston rod that the sealing component are few, simple in structure, cost is low and can use at defective piston rod, and can be applied to piston rod and have coating to come off, scratch, wear and tear, become rusty in the sealing of the defectives such as hole, distortion.
Goal of the invention of the present invention is achieved in that and comprises by the medium pressure action and expanding in seal ring and the ring-shaped flexible seal body of the cavity of working, the axial section that it is characterized in that seal ring is closed shape, and its axial cross section is the cavity structure that is comprised of inwall ring, left and right both ends of the surface and outer wall ring.There is the stepped shaft annular slot seal ring one exterior edge face by inner radius.
Said seal ring cross section is overall structure, or composite structure, and there is the through hole that runs through its thickness its outer wall ring or right side, and the groove that connects with it.
When the seal ring cross section is overall structure, with the through hole that is evenly equipped with axial perforation wall thickness on the right side of the corresponding side of stepped shaft annular slot, the outside of right side has and is radially the groove that connects, groove crossing and perforation corresponding to through hole, and seal ring inwall ring surface is the cambered surface that is to the central direction projection.
When seal ring is composite structure, wherein a kind of form is: inwall ring and left and right both ends of the surface are a part, the outer wall ring is a part, and the both ends of the surface of its outer wall ring are loaded in the interior closure gasket groove of the left and right both ends of the surface of another part, and the through hole that runs through its thickness is arranged on the outer wall ring.
When seal ring is composite structure, another kind of form is: inwall ring and left and right both ends of the surface are a part, the outer wall ring is a part, the both ends of the surface of its outer wall ring are loaded in the interior closure gasket groove of the left and right both ends of the surface of another part, be evenly equipped with the through hole of axial perforation in right side corresponding to stepped shaft annular slot end face, and have and be radially the groove that connects, through hole is connected with groove.
The each several part wall thickness of the axial cross section of said seal ring is close.
The material of said seal ring is elongation percentage greater than 50% engineering plastics, macromolecular material, rubber and plastic composite, rubber material.
Said trench cross section is rectangle, semicircle, triangle, ellipse.
The present invention is applied in when working in oil hydraulic cylinder or the pneumatic linear actuator, and in the corresponding hydraulic fluid port fluid injection process, liquid is by the groove of rod seal circle end face, and the open-work with the seal ring end face enters in the seal ring.Perhaps working medium passes through the radial conduction groove on the guide sleeve seal groove respective face, and the open-work on the outer wall ring, arrives the chamber of energizing in the seal ring.With regard to the end face static seal, piston rod of the present invention adopts the way of body interference to be resolved with static seal.Static seal face of the present invention is external diameter and the end face that two complete surfaces are the outer wall ring, and its sealing surface accounts for 1/2 of seal ring surface, so under identical seal groove width, the area of static seal is multiplied, sealing effect also is multiplied.Compared with prior art, do not use support ring and threaded adjustment mechanisms, need to not beat at guide sleeve again and intersect oilhole, not only reduced processing accessories kind and quantity but also can reduce machining accuracy, so reached the purpose that finally cuts down finished cost.Using a kind of form of the present invention, is not do under the condition of change at original rod seal groove, replaces with seal ring of the present invention and just can use.Using another kind of form of the present invention is to make the radial conduction groove in guide sleeve seal groove respective face.Two kinds of types of service not only new piston rod can use, and can also the coating defectives such as hole, distortion that come off, scratch, become rusty occur to old rod seal surface and equally also can play the sealing effect the same with new piston rod.Empirical tests is used in above-mentioned defective piston rod, can reach equally the sealing effect of correlation standard.This kind seal ring user cost is low.
Description of drawings
Below in conjunction with accompanying drawing the present invention is described in further detail.
Fig. 1 is the axial view of the embodiment of the invention 1;
Fig. 2 is the axial section structural drawing of Fig. 1;
Fig. 3 is the axial section structural drawing of embodiments of the invention 2;
Fig. 4 is the axial section structural drawing of embodiments of the invention 3;
Fig. 5 is the use status architecture schematic diagram of the embodiment of the invention 1.
Embodiment
Among Fig. 1, Fig. 2, seal ring 1 is overall structure of the present invention.It is that an axial cross section is approximately " mouth " font, the ring-shaped flexible seal body of axial section sealing, and its axial cross section is the cavity structure that is comprised of inwall ring 2, left side 3, right side 4 and outer wall ring 5.Inwall ring 2, left side 3, right side 4 and outer wall ring 5 are an integral body, and 9 are the cavity of energizing of its formation; Be evenly equipped with the through hole 6 of axial perforation wall thickness on the right side 4, the outside of right side 4 has and is radially the groove 7 that connects, groove 7 and through hole 6 corresponding crossing and perforations.There are the stepped shaft annular slot 8 that a section is rectangular and parallel to the axis in internal diameter of the seal ring and the side intersection opposite with through hole 6 end faces are arranged.Seal ring inwall ring 2 surfaces are circular-arc to the central direction projection under free state.
Among Fig. 3, seal ring 1 is a kind of composite structure of the present invention, it is that an axial cross section is approximately " n " font, the axial untight ring-shaped flexible seal body 1 of section, cavity structure with outer wall ring 10 compositions, inwall ring 2, left side 3, right side 4 are integrated, and 9 are the cavity of energizing of its formation; Be evenly equipped with the through hole 6 of axial perforation wall thickness on the right side 4, the outside of end face 4 has and is radially the groove 7 that connects, groove 7 and through hole 6 corresponding crossing and perforations.There are the stepped shaft annular slot 8 that a section is rectangular and parallel to the axis in internal diameter of the seal ring and the side intersection opposite with through hole 6 end faces are arranged; It is circular-arc to the central direction projection that seal ring inwall 2 surfaces are under free state.The both ends of the surface of outer wall ring 10 are contained in the inner seal annular groove 18 of the inboard of left side 3 and right side 4.
Among Fig. 4, seal ring 1 is another kind of composite structure of the present invention, it is that an axial cross section is approximately " n " font, the axial untight ring-shaped flexible seal body 1 of section, inwall ring 2, left side 3, right side 4 are integrated, with the cavity structure that outer wall ring 10 forms, 9 are the cavity of energizing of its formation; Radial direction through hole 11 is arranged on the outer wall ring 10; There are the stepped shaft annular slot 8 that a section is rectangular and parallel to the axis in internal diameter of the seal ring and the side intersection opposite with right side 4; Seal ring inwall ring 2 surfaces are circular-arc to the central direction projection under free state.The both ends of the surface of outer wall ring 10 are contained in the inner seal annular groove 18 of the inboard of left side 3 and right side 4.
Among Fig. 5, be that the embodiment of the invention 1 is applied in the axial section structural drawing in double-acting hydraulic cylinder or the pneumatic linear actuator.The axial width of seal ring 1 is more bigger than seal groove width, and interference is arranged in the assembling.The external diameter of sealing circle 1 equals the internal diameter of seal groove.Seal ring 1 embeds in the seal groove of cylinder barrel 15, anti-extrusion ring 12 is embedded in the groove of stairstepping of seal ring 1, in the time of in working order, seal ring 1 is subject to the restrained deformation of piston rod 13 to the projection of piston rod direction, generation is to the positive pressure of piston rod, and this positive pressure has reached the necessary condition of piston rod initial sealing.Increased pressure along with pressure chamber 14, working medium is by the groove 7 of the radial conduction of seal ring 1, after arriving the through hole 6 of seal ring 1 end face drainage, the final sap cavity 9 of energizing that arrives, according to pascal's principle, on the external diameter projection plane 17 of the pressure action of working medium in the seal ring chamber, strengthened the motive sealing effect of seal ring 1.On the internal diameter projection plane 16 and end on projection face of operation medium in the chamber, strengthened the static seal effect of seal ring 1.When working pressure was cancelled, sap cavity 9 pressure of energizing were cancelled with system pressure, and the positive pressure that this moment, seal ring 1 acted on the piston rod also reduces along with the variation of system pressure, and frictional force also reduces immediately, thereby reaches the requirement of the formula compensation sealing of energizing.
Claims (10)
1. moving seal ring for piston rod, the ring-shaped flexible seal body of the cavity that seal ring (1) is worked for being expanded in seal ring by the medium pressure action, it is characterized in that: the axial cross section of seal ring (1) is closed shape, its axial cross section is the cavity structure that is comprised of inwall ring (2), left side (3), right side (4) and outer wall ring (5), there is the through hole that runs through its thickness its outer wall ring (5) or right side (4), and the groove that connects with it.
2. moving seal ring for piston rod according to claim 1 is characterized in that: seal ring (1) is overall structure, or composite structure.
3. moving seal ring for piston rod according to claim 2, it is characterized in that: when seal ring (1) is overall structure, be evenly equipped with the through hole (6) of axial perforation wall thickness on the right side (4), the outside of right side (4) has and is radially the groove (7) that connects, groove (7) is corresponding with through hole (6) to intersect and perforation, and seal ring inwall ring (2) surface is for to be to the cambered surface of central direction projection.
4. moving seal ring for piston rod according to claim 2, it is characterized in that: when seal ring (1) is composite structure, inwall ring (2), left side (3), right side (4) are integrated, the both ends of the surface of outer wall ring (10) are contained in the inner seal annular groove (18) of the inboard of left side (3) and right side (4), and the through hole (11) that runs through its thickness is arranged on the outer wall ring (10).
5. moving seal ring for piston rod according to claim 2, it is characterized in that: when seal ring (1) is composite structure, inwall ring (2), left side (3), right side (4) are integrated, outer wall ring (10) is loaded in the closure gasket groove (18) of left side (3) and right side (4) inboard, be evenly equipped with the through hole (6) of axial perforation on the right side (4), and have and be radially the groove (7) that connects, through hole (6) is connected with groove (7).
6. moving seal ring for piston rod according to claim 1, it is characterized in that: trench cross section is rectangle, semicircle, triangle, ellipse.
7. moving seal ring for piston rod according to claim 1, it is characterized in that: seal ring left side (3) have stepped shaft annular slot (8) by inner radius.
8. moving seal ring for piston rod according to claim 1 is characterized in that: seal ring inwall ring (2) surface is circular-arc to the central direction projection under free state.
9. moving seal ring for piston rod according to claim 1 is characterized in that: the each several part wall thickness of the axial cross section of seal ring (1) is close.
10. moving seal ring for piston rod according to claim 1 is characterized in that: the material of seal ring is elongation percentage greater than 50% macromolecular material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510018269 CN1815066B (en) | 2005-02-06 | 2005-02-06 | Energized dynamic seal ring for piston rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510018269 CN1815066B (en) | 2005-02-06 | 2005-02-06 | Energized dynamic seal ring for piston rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1815066A CN1815066A (en) | 2006-08-09 |
| CN1815066B true CN1815066B (en) | 2013-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510018269 Active CN1815066B (en) | 2005-02-06 | 2005-02-06 | Energized dynamic seal ring for piston rod |
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| Country | Link |
|---|---|
| CN (1) | CN1815066B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB115281A (en) * | 1900-01-01 | |||
| 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 |
-
2005
- 2005-02-06 CN CN 200510018269 patent/CN1815066B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB115281A (en) * | 1900-01-01 | |||
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| JP昭59-144803A 1984.08.20 |
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| Publication number | Publication date |
|---|---|
| CN1815066A (en) | 2006-08-09 |
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Application publication date: 20060809 Assignee: Xiangfan Hubei hang Xiang electro hydraulic Servo Technology Co., Ltd. Assignor: Zhang Ge Contract record no.: 2013420000137 Denomination of invention: Moving seal ring for piston rod Granted publication date: 20130109 License type: Exclusive License Record date: 20130830 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
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Change date: 20140331 Contract record no.: 2013420000137 Assignee after: HUBEI XIANGYANG HANGXIANG HYDRAULIC SERVO TECHNOLOGY CO., LTD. Assignee before: Xiangfan Hubei hang Xiang electro hydraulic Servo Technology Co., Ltd. |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
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Change date: 20140331 Contract record no.: 2013420000137 Assignee after: HUBEI XIANGYANG HANGXIANG HYDRAULIC SERVO TECHNOLOGY CO., LTD. Assignee before: Xiangfan Hubei hang Xiang electro hydraulic Servo Technology Co., Ltd. |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161226 Address after: 441000 Chaoyang Road, Fancheng District, Hubei, Xiangyang, China Patentee after: Liang Suzhen Address before: 441002 Jianchang, Hubei Mayor Han Road, compound 26-604 Patentee before: Zhang Ge |