CN103791096A - Seal ring - Google Patents
Seal ring Download PDFInfo
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- CN103791096A CN103791096A CN201410068409.7A CN201410068409A CN103791096A CN 103791096 A CN103791096 A CN 103791096A CN 201410068409 A CN201410068409 A CN 201410068409A CN 103791096 A CN103791096 A CN 103791096A
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- seal ring
- ring
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- spring
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Abstract
The invention provides a seal ring. The seal ring comprises a lip-shaped ring body and an elasticity compensation element. The elasticity compensation element is arranged in an annular groove between an upper lip and a lower lip of the lip-shaped ring body. The elasticity compensation element is composed of two annular spiral metal springs in a sleeved mode, wherein the inner-ring spiral spring is sleeved with the outer-ring spiral spring in a spiral mode; the inner-ring spiral spring and the outer-ring spiral spring are of an end-to-end ring shape; the spiral direction of the inner-ring spiral spring is opposite to that of the outer-ring spiral spring. According to the seal ring, the two spiral springs which are opposite in spiral direction are used as the stress compensation element and arranged in the annular groove of the lip-shaped ring body so that continuous and uniform radial elasticity compensation can be provided for the lip-shaped ring body. Meanwhile, according to the structure, the shrinking percentage of the elasticity compensation element of the seal ring in an ultra-low-temperature working environment is lowered, it is guaranteed that the seal ring has enough sealing force in a low-temperature environment, and the sealing performance of the seal ring in the ultra-low-temperature working environment is improved.
Description
Technical field
The present invention relates to the technical field of sealing technology of working at ultra-low temperature environment, especially, relate to a kind of seal ring.
Background technique
Seal ring is widely used in all trades and professions as a kind of conventional machinery part, is often applied to the dynamic seal (packing) between axle and hole, mainly plays the effect of anti-liquid or Leakage Gas.The seal ring overwhelming majority that prior art is produced is sealed by elastomeric body, and sealing force is mainly provided by system itself and seal ring lip body self elasticity.Along with being widely used of seal ring, different applications is also different to the requirement of seal ring.
In prior art, seal ring general using elastomeric body is as rubber seals, and the elasticity of the seal ring being processed into by rubber material itself provides sealing force.But adopt merely seal ring that quality of rubber materials makes can because external environment as the variation of pressure, temperature or for a long time the reason such as wearing and tearing and material aging cause the elasticity of seal ring reduce or disappear, and then cause sealing variation.The minimum tolerable temperature of rubber material is subzero 50 ℃ of left and right, thereby in the ultra-low temperature surroundings of subzero 200 ℃, rubber sclerosis can occur and even breaks, and follows the string completely.Certainly, under above-mentioned ultra-low temperature surroundings, in view of the elasticity temperature influence of metal self is less, can adopt metal sealing method, utilize metallic material to provide enough equilibrant forces to the elastic shrinkage amount of sealing system.But adopt metal sealing method, the friction in equipment between metal and metal can make sealing surface scratch, and reduces the sealing of equipment.Therefore, ultra-low temperature surroundings has proposed more harsh conditions to seal ring.
Experimental research shows: the shrinkage of non-metallic component is ten times of left and right of metal parts, so metal spring can provide enough equilibrant forces to become key.Prior art provides a kind of seal ring that the helical spring mode of individual layer is made that arranges in nonmetal sealing lip, utilizes built-in helical spring to provide elastic compensating power for seal ring.But there is pitch due to after spring processing, and between pitch, provide elastic force without spring, the stretch compensation of sealing lip is not continuous uniform, this causes sealing circle in the very easy leakage during with cryogenic media of sealing low molecular weight gas.
In a word, need the urgent technical problem solving of those skilled in the art to be exactly: a kind of seal ring to be provided, sealing lip to be formed to the elastic force of continuous uniform, guarantee under ultra-low temperature surroundings, to possess good sealing.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of seal ring with realizing the stress compensation element that radial stress compensation and pretightening force are stable, for the sealing of machinery under working at ultra-low temperature environment.
In order to address the above problem, provide a kind of seal ring on the one hand, comprising: lip circle body and elastic compensating element, described elastic compensating element is placed in the annular groove between described lip circle body upper lip and lower lip; Described elastic compensating element is double-layer spiral metal spring, and wherein, outer ring helical spring is placed on the helical spring outside of inner ring; Described Internal and external cycle helical spring is all the ring-type that head and the tail connect, and the helical spring Hand of spiral of described inner ring is contrary with the helical spring Hand of spiral in described outer ring.
Optionally, the outer surface of described lip circle body is through polishing treatment, and the surface finishment after polishing is not less than Ra0.4 μ m, and the groove that is not less than Ra0.2 μ m with sealing surface degree of finish is used in conjunction with.
Optionally, described inner ring helical spring turns to by a Cylindrical object rotating bending toroidal that head and the tail are connected by bandlet type metal with outer ring helical spring.
Optionally, the opening of described annular groove is less than footpath, helical spring section of described outer ring.
Optionally, described circular spiral metal spring is stainless steel spring or alloy spring.
Optionally, described lip circle body adopts high molecular polymer to make.
Optionally, described high molecular polymer is teflon.
Optionally, described high molecular polymer is polychlorotrifluoroethylene.
Optionally, described high molecular polymer is ultra high molecular polyethylene.
Compared with prior art, a technological scheme in technique scheme has the following advantages or beneficial effect:
Seal ring that the embodiment of the present invention provides adopts the contrary double-helix spring of rotation direction to be placed in the circumferential groove of lip circle body as stress compensation element, can provide continuously for lip circle body, radical elasticity compensates uniformly.Meanwhile, the shrinkage of the elastic compensating element that this structure makes seal ring in working at ultra-low temperature environment reduces, and guaranteed that seal ring has enough sealing forces under low temperature environment, has improved the sealability of seal ring in working at ultra-low temperature environment.
accompanying drawing explanation
By reading below detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing is only for the object of preferred implementation is shown, and do not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Fig. 1 is seal ring embodiment's of the present invention structural representation;
Fig. 2 is the structural representation of double-layer circular spiral metal spring of the present invention;
Fig. 3 is the vertical cut-away schematic view of double-layer circular spiral metal spring of the present invention;
Fig. 4 is the helical spring making schematic diagram in outer ring of the present invention;
Fig. 5 is the helical spring making schematic diagram of inner ring of the present invention;
Fig. 6 is the stressed schematic diagram of double-layer circular spiral metal spring of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
With reference to Fig. 1, show seal ring embodiment's of the present invention structural representation, comprising: lip circle body 1 and elastic compensating element 2, wherein, lip circle body 1 comprises: upper lip 11, lower lip 12 and annular groove 13.Elastic compensating element 2 is placed in the annular groove 13 between lip circle body upper lip 11 and lower lip 12.The A/F T of annular groove 13 is less than section footpath D of elastic compensating element, avoids elastic compensating element to install and from annular groove 13, comes off afterwards.
In the embodiment of the present invention, the double-layer circular spiral metal spring being nested inside and outside elastic compensating element 2 is specially.
The concrete structure of above-mentioned double-layer circular spiral metal spring is with reference to shown in Fig. 2,3.Wherein, structural representation, Fig. 3 that Fig. 2 shows double-layer circular spiral metal spring of the present invention shows the vertical cut-away schematic view of double-layer circular spiral metal spring of the present invention.Double-layer circular spiral metal spring comprises: outer ring helical spring 21 and inner ring helical spring 22, and outer ring helical spring 21 is placed on the outside of inner ring helical spring 22, and inner ring helical spring 22 is threaded onto the inside of outer ring helical spring 21.Inner ring helical spring 22 is all with outer ring helical spring 21 ring-type that head and the tail are connected, and the Hand of spiral of inner ring helical spring 22 is contrary with the Hand of spiral of outer ring helical spring 21.In the embodiment of the present invention, the right hand helix spring shown in the concrete employing Fig. 4 of outer ring helical spring 21, corresponding, inner ring helical spring 22 adopts the left-handed helical spring shown in Fig. 5.Section footpath of inner ring helical spring 22 is slightly less than the footpath of cutting of outer ring helical spring 21.
The internal and external screw spring adopting in the embodiment of the present invention turns to by a Cylindrical object rotating bending toroidal that head and the tail connect by bandlet type metal.Particularly, Fig. 4 shows the making schematic diagram of outer ring of the present invention helical spring 21, before connecting into ring, first by bandlet type metallic material around the center line C of Cylindrical object rotating bending, turn to circumnutate to single-lead terminating point B from single-lead starting point A and complete a pitch, go round and begin again, until the helical spring winding of predetermined length completes.Fig. 5 shows the helical spring making method of inner ring, similar with Fig. 4, is the opposite direction from single-lead starting point rotating bending, until the helical spring winding of predetermined length completes.Finally, the inner ring helical spring shown in Fig. 5 that coiling is completed screws in the helical spring inside, outer ring shown in Fig. 4, then the head and the tail of two springs is connected, and obtains the double-layer circular ring-type helical spring shown in Fig. 2.
The double-layer circular ring-type helical spring that the embodiment of the present invention adopts by the coiling of bandlet type metal after head and the tail be connected to annulus and moulding, compared with the helical spring of straight line type metal coiling, the stretch compensation of generation is larger, thereby plays better sealing effect.Above-mentioned circular spiral metal spring is stainless steel spring or alloy spring.
Fig. 6 shows the helical spring stressed schematic diagram of double-layer circular ring-type of seal ring of the present invention, when Sealing is fit into after groove, because being less than Sealing, groove depth cuts footpath, can produce compressive deformation, make spring produce radially deformation, the rebounding force that spring discharges makes inside and outside sealing lip tightly touch sealing surface, reaches sealing effect.
Common individual layer helical spring accumulation of energy seal ring, owing to having pitch after the processing of individual layer spring, just has one section to provide elastic force without spring between every section of band, thereby the elastic force that lip circle body is formed is not continuous uniform.The embodiment of the present invention adopts the contrary double-layer spiral metal spring of rotation direction as elastic compensating element, because of the helical spring rotation direction in inner ring helical spring and outer ring different, inner ring helical spring can make up the inelastic deficiency of outer ring pitch, for lip circle body provides continuously, uniform elastic compensating power, and then the sealing of raising seal ring, effectively avoid the leakage of low molecular weight gas, cryogenic media.In ultra-low temperature surroundings, double-layer spiral metal spring cuts the shrinkage in footpath and cuts the shrinkage in footpath much smaller than individual layer spiral metal spring, and then has guaranteed that seal ring has enough sealing forces under low temperature environment simultaneously.
Seal ring provided by the invention can be for ultralow temperature media such as sealing fluid nitrogen, LNG Liquefied natural gas or cryogenic gases, and these medium molecule amounts are little, compare conventional hydraulic oil, and liquid and other medium is more easily revealed.In order to guarantee good sealing and low leakage, this just needs the lip circle body surface of seal ring very high with the degree of finish of part (groove) contact surface, just both have better effectively contact like this.In seal ring embodiment of the present invention, the outer surface of lip circle body is through polishing treatment, and the surface finishment of the lip circle body after polishing is not less than Ra0.4 μ m, requires grooved seal face degree of finish to be not less than Ra0.2 μ m simultaneously.Wherein, Ra is profile arithmetic average error value.
In addition, for the sealing of ultralow temperature medium, the material of the lip circle body to seal ring has also proposed requirements at the higher level, and the embodiment of the present invention adopts the high molecular polymers such as teflon, polychlorotrifluoroethylene, ultra high molecular polyethylene to make.Experimental research shows, above-mentioned high molecular polymer has good resistance to wearing and heat resistent property, low gas permeability, good low-temperature characteristics, waits until the ultralow temperature sealing of extreme vacuum environment in being mainly used in.
It should be noted that; in this embodiment, elastic compensating element all adopts circular helical spring, and groove relative set is annular groove; but the present invention is not limited thereto, adopt other forms of elastic compensating element and corresponding groove all within protection scope of the present invention.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and other embodiments' difference, between each embodiment identical similar part mutually referring to.
To a kind of seal ring provided by the present invention, be described in detail above, applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (9)
1. a seal ring, comprising: lip circle body and elastic compensating element, and described elastic compensating element is placed in the annular groove between described lip circle body upper lip and lower lip; It is characterized in that, described elastic compensating element is double-layer spiral metal spring, and wherein, outer ring helical spring is placed on the helical spring outside of inner ring; Described Internal and external cycle helical spring is all the ring-type that head and the tail connect, and the helical spring Hand of spiral of described inner ring is contrary with the helical spring Hand of spiral in described outer ring.
2. seal ring according to claim 1, is characterized in that, the outer surface of described lip circle body is through polishing treatment, and the surface finishment after polishing is not less than Ra0.4 μ m, and the groove that is not less than Ra0.2 μ m with sealing surface degree of finish is used in conjunction with.
3. seal ring according to claim 1, is characterized in that, described inner ring helical spring turns to by a Cylindrical object rotating bending toroidal that head and the tail are connected by bandlet type metal with outer ring helical spring.
4. seal ring according to claim 1, is characterized in that, the opening of described annular groove is less than footpath, helical spring section of described outer ring.
5. seal ring according to claim 1, is characterized in that, described circular spiral metal spring is stainless steel spring or alloy spring.
6. according to the arbitrary described seal ring of claim 1 to 5, it is characterized in that, described lip circle body adopts high molecular polymer to make.
7. seal ring according to claim 6, is characterized in that, described high molecular polymer is teflon.
8. seal ring according to claim 6, is characterized in that, described high molecular polymer is polychlorotrifluoroethylene.
9. seal ring according to claim 6, is characterized in that, described high molecular polymer is ultra high molecular polyethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410068409.7A CN103791096A (en) | 2014-02-27 | 2014-02-27 | Seal ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410068409.7A CN103791096A (en) | 2014-02-27 | 2014-02-27 | Seal ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103791096A true CN103791096A (en) | 2014-05-14 |
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Family Applications (1)
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|---|---|---|---|
| CN201410068409.7A Pending CN103791096A (en) | 2014-02-27 | 2014-02-27 | Seal ring |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104265892A (en) * | 2014-09-17 | 2015-01-07 | 江苏亿阀集团有限公司 | Composite sealing ring for low-temperature valve |
| CN104455524A (en) * | 2014-09-30 | 2015-03-25 | 江苏亿阀集团有限公司 | Composite sealing low-temperature ball valve |
| CN104500748A (en) * | 2014-12-03 | 2015-04-08 | 上海康大橡胶制品制造有限公司 | O-shaped ring |
| CN104534093A (en) * | 2014-12-19 | 2015-04-22 | 天津科斯特汽车技术有限责任公司 | Spring tension type sealing piece |
| CN105952891A (en) * | 2016-06-27 | 2016-09-21 | 上海默作精密仪器有限公司 | Elastic metal sealing ring |
| CN106958657A (en) * | 2017-04-19 | 2017-07-18 | 李耀强 | A kind of pure electric automobile dedicated sealing member |
| CN107461493A (en) * | 2016-06-03 | 2017-12-12 | 上海希伯自控技术有限公司 | A kind of metal spring accumulation of energy sealing ring |
| CN108561553A (en) * | 2018-06-29 | 2018-09-21 | 四川日机密封件股份有限公司 | A kind of sealing ring |
| CN110748645A (en) * | 2019-10-28 | 2020-02-04 | 西安近代化学研究所 | Sealing device suitable for corrosive liquid |
| CN111224127A (en) * | 2020-01-15 | 2020-06-02 | 同济大学 | Fuel cell stack sealing structure and stress relaxation compensation method |
| CN112080304A (en) * | 2020-10-08 | 2020-12-15 | 杨松 | Special sealing friction pair for waste tire pyrolysis reaction furnace |
| CN112096865A (en) * | 2020-09-08 | 2020-12-18 | 中国航发沈阳黎明航空发动机有限责任公司 | Double-linkage back-to-back assembled elastic sealing structure for aero-engine |
| CN113187972A (en) * | 2021-05-20 | 2021-07-30 | 中国科学院合肥物质科学研究院 | Large-caliber structure sealing ring suitable for high and low temperatures and sealing structure |
| CN113847491A (en) * | 2021-09-29 | 2021-12-28 | 常州三众弹性技术有限公司 | Flange sealing structure, application thereof and sealing performance detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3866925A (en) * | 1972-01-31 | 1975-02-18 | Forsheda Ideutveckling Ab | Device for increasing the elastic force of and reinforcing objects manufactured from an elastic material |
| US4379558A (en) * | 1981-05-01 | 1983-04-12 | Utex Industries, Inc. | Anti-extrusion packing member |
| US6419236B1 (en) * | 1999-08-20 | 2002-07-16 | Robert Janian | Springclip ring |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104265892A (en) * | 2014-09-17 | 2015-01-07 | 江苏亿阀集团有限公司 | Composite sealing ring for low-temperature valve |
| CN104455524A (en) * | 2014-09-30 | 2015-03-25 | 江苏亿阀集团有限公司 | Composite sealing low-temperature ball valve |
| CN104455524B (en) * | 2014-09-30 | 2017-06-20 | 江苏亿阀集团有限公司 | A kind of compound seal cryogenic ball valve |
| CN104500748A (en) * | 2014-12-03 | 2015-04-08 | 上海康大橡胶制品制造有限公司 | O-shaped ring |
| CN104534093A (en) * | 2014-12-19 | 2015-04-22 | 天津科斯特汽车技术有限责任公司 | Spring tension type sealing piece |
| CN107461493A (en) * | 2016-06-03 | 2017-12-12 | 上海希伯自控技术有限公司 | A kind of metal spring accumulation of energy sealing ring |
| CN105952891A (en) * | 2016-06-27 | 2016-09-21 | 上海默作精密仪器有限公司 | Elastic metal sealing ring |
| CN106958657A (en) * | 2017-04-19 | 2017-07-18 | 李耀强 | A kind of pure electric automobile dedicated sealing member |
| CN108561553A (en) * | 2018-06-29 | 2018-09-21 | 四川日机密封件股份有限公司 | A kind of sealing ring |
| CN110748645A (en) * | 2019-10-28 | 2020-02-04 | 西安近代化学研究所 | Sealing device suitable for corrosive liquid |
| CN110748645B (en) * | 2019-10-28 | 2022-02-22 | 西安近代化学研究所 | Sealing device suitable for corrosive liquid |
| CN111224127A (en) * | 2020-01-15 | 2020-06-02 | 同济大学 | Fuel cell stack sealing structure and stress relaxation compensation method |
| CN112096865A (en) * | 2020-09-08 | 2020-12-18 | 中国航发沈阳黎明航空发动机有限责任公司 | Double-linkage back-to-back assembled elastic sealing structure for aero-engine |
| CN112080304A (en) * | 2020-10-08 | 2020-12-15 | 杨松 | Special sealing friction pair for waste tire pyrolysis reaction furnace |
| CN113187972A (en) * | 2021-05-20 | 2021-07-30 | 中国科学院合肥物质科学研究院 | Large-caliber structure sealing ring suitable for high and low temperatures and sealing structure |
| CN113847491A (en) * | 2021-09-29 | 2021-12-28 | 常州三众弹性技术有限公司 | Flange sealing structure, application thereof and sealing performance detection method |
| CN113847491B (en) * | 2021-09-29 | 2022-12-23 | 常州三众弹性技术有限公司 | Flange sealing structure, application thereof and sealing performance detection method |
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Application publication date: 20140514 |