CN112524364A - Spring energy storage sealing structure for planar flange and matching installation method - Google Patents
Spring energy storage sealing structure for planar flange and matching installation method Download PDFInfo
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- CN112524364A CN112524364A CN202011462116.9A CN202011462116A CN112524364A CN 112524364 A CN112524364 A CN 112524364A CN 202011462116 A CN202011462116 A CN 202011462116A CN 112524364 A CN112524364 A CN 112524364A
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- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/16—Flanged joints characterised by the sealing means
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Abstract
The invention discloses a spring energy storage sealing structure for a planar flange and a matching installation method, the spring energy storage sealing structure for the planar flange comprises a first flange, a second flange and a sealing element which are assembled together, the end surfaces of the first flange and the second flange are provided with a first assembly surface and a second assembly surface, the second assembly surface is provided with a sealing groove with a closed contour, the sealing element comprises a C-shaped shell and an inner core spring, the C-shaped shell is integrally provided with a closed contour, the C-shaped shell is provided with a circumferential opening, the included angle alpha of the C-shaped shell is 40-90 degrees, and the opening faces to the side with higher pressure; the section is as follows when assembling: the upper side and the lower side of the C-shaped shell are respectively kept in contact with the first flange and the groove bottom and respectively form a first sealing surface and a second sealing surface, and the outer diameter of one end of the inner core spring is gradually reduced and screwed into the inner diameter of the other end of the inner core spring. The opening of the invention enhances the sealing performance, and the end-to-end connection mode of the spring shortens the production period.
Description
Technical Field
The invention relates to the field of metal sealing, in particular to a spring energy storage plane flange sealing structure.
Background
In the fields of aerospace, nuclear power energy and the like, conveying media inside a pipeline system generally have the characteristics of flammability, explosiveness, high temperature, high pressure, strong corrosiveness and the like, once the media leak, serious consequences such as fire, explosion or toxic substance diffusion are easily caused, and the safety operation of mechanical equipment and the guarantee of human life are threatened, so that a sealing piece for a flange joint surface of a pipeline must have excellent high-temperature-pressure resistance and corrosion resistance. At present, metal sealing is used as an effective sealing form, and the metal sealing can be divided into a metal gasket, an O-shaped sealing ring, a C-shaped sealing ring, a W-shaped sealing ring and an energy storage C-shaped sealing ring with a spring according to the cross section shape. And placing the metal seal into the groove of the flange surface, and compressing the flange surface to realize the seal of the flange surface.
In practical application, because the spring energy storage C-shaped sealing ring has the characteristics of resilience, bearing capacity and the like, the spring energy storage C-shaped sealing ring is more widely applied to flange connection surfaces in the fields of aerospace, nuclear power energy and the like, but with the rapid development of science and technology in the fields, the pressure of a medium is larger, the temperature change range is wider, the corrosion performance is stronger, and higher requirements are provided for the material selection and the specific structural performance of the spring energy storage C-shaped sealing ring. Moreover, with the advancement of the corresponding industries, the demand for sealing rings is also increasing, which also requires that the sealing mechanism should have easier processing characteristics.
Disclosure of Invention
The invention provides a spring energy storage metal plane flange sealing structure, which aims to solve the problems of low sealing performance and high processing difficulty in the prior art.
The technical solution of the invention is as follows: a spring energy storage metal sealing structure comprises a first flange, a second flange and a sealing element which are assembled together, wherein the end face of the first flange is provided with a first assembling surface, and the end face of the second flange is provided with a second assembling surface;
the second assembling surface is provided with a sealing groove with a closed contour, and the groove is matched with the sealing element;
the sealing element comprises a C-shaped shell and an inner core spring arranged in the C-shaped shell, the C-shaped shell is integrally of a closed outline, the inner core spring is a lining, the C-shaped shell is tightly wrapped on the outer side of the inner core spring, the C-shaped shell is provided with a circumferential opening, the included angle alpha of the opening is 40-90 degrees, and the opening faces to the side with higher medium pressure in work;
when the first flange, the second flange and the sealing element are assembled together, the structure of any axial section is as follows: the upper side of the C-shaped shell keeps contact with the first flange and forms a first sealing surface, the lower side of the C-shaped shell keeps contact with the bottom surface of the sealing groove and forms a second sealing surface, and the left side and the right side of the C-shaped shell respectively keep gaps with the sealing groove;
the inner core spring is a spring connected end to end, and the outer diameter of one end of the inner core spring is gradually reduced and screwed into the inner diameter of the other end.
Furthermore, the inner core spring is composed of a plurality of sections of springs connected end to end, the head end of each section of spring is a diameter-changing part, and the outer diameter of the diameter-changing part is gradually reduced so as to be screwed into the tail end of the adjacent spring.
Further, the diameter r of the spring wire of the core springsThe wall thickness h of the C-shaped housingcEqual, 0.2 mm-0.6 mm.
Further, the C-shaped outer shell and the inner core spring are made of high-temperature alloy materials, and specifically, the materials of the C-shaped outer shell and the inner core spring are related according to the medium temperature: the medium temperature is less than or equal to 870 ℃, and the material grade is selected to be GH 4141; the medium temperature is less than or equal to 730 ℃, and the material grade is selected to be GH 4738; the medium temperature is less than or equal to 630 ℃, and the material grade is selected to be GH 4169; the medium temperature is less than or equal to 450 ℃, and the material grade is GH 4145.
Further, the profile of the axial cross section of the C-shaped housing is circular, axially long-axis elliptical, or radially long-axis elliptical.
Furthermore, the diameter H of the outer contour of the C-shaped shell is 1.6 mm-5 mm.
Furthermore, the outer surface of the C-shaped shell is provided with a high-temperature resistant layer, and the roughness is less than or equal to Ra0.8 mu m.
Furthermore, the outer surface of the C-shaped shell is sprayed and coated with non-metallic material PTFE (polytetrafluoroethylene).
Furthermore, the outer surface of the C-shaped shell is subjected to spraying and soft metal electroplating treatment, and the thickness of the soft metal electroplating is 0.20-0.25 mm.
Further, the matching installation method of the spring energy storage sealing structure for the planar flange comprises the following steps:
(1) assembling: placing the sealing element into the sealing groove of the second flange, wherein radial gaps between the sealing element and two wall surfaces of the sealing groove of the second flange are uniform;
(2) pre-tightening: screwing bolts assembled by the first flange and the second flange, and compressing a first assembling surface of the first flange to be uniformly and axially close to an assembling surface of the second flange, wherein the compression amount is h;
(3) screwing: continuing to tighten the bolts, and reducing the gap between the first assembling surface of the first flange and the second assembling surface of the second flange to be nearly zero when the sealing element is subjected to axial pressure;
(4) the work is as follows: the first flange or/and the second flange are deformed to generate certain relative separation, the gap is increased, the gap between the first assembling surface and the second assembling surface is h ', generally 0< h' is less than or equal to 30% h, the inner side of the C-shaped shell is subjected to medium pressure and the supporting force of the spring inner core, compared with the included angle alpha of the opening in the step (3), the C-shaped shell restores a part of deformation to generate self-tightening effect, and the C-shaped shell is kept in close contact with the first assembling surface.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, through the opening with the included angle of 40-90 degrees, the deformation of the C-shaped shell under the pressure of a medium is not easy to influence the actual sealing surface, and the C-shaped shell has more excellent resilience and sealing performance.
(2) According to the invention, the diameter of the wound spring section is reduced to be used as a joint, and the wound spring section is screwed into the other end to form a screwing lock catch, so that an annular spring is formed; in the manufacturing of the large-diameter annular spring, a plurality of short springs can be combined in a segmented mode through the method, compared with the traditional method that two ends of the spring are connected through a welding process, the combination method greatly accelerates the manufacturing progress, shortens the production period and saves needed manpower and material resources.
(3) The invention adopts high-temperature alloy materials, has wide applicable working temperature range (-253-870 ℃), high pressure bearing capacity (less than or equal to 90MPa), and has excellent sealing capacity for various fluids including liquid hydrogen, liquid oxygen, methane, oxygen-enriched fuel gas, dinitrogen tetroxide, hydrazine substances, water, nitrogen, air, kerosene, fuel oil and other media.
(4) The invention can make the seal have elastic self-tightening function, the medium pressure and the inner core spring provide enough supporting force when the C-shaped shell is under high pressure, the seal is always kept in close contact with the flange plane, the sealing performance is maintained, the bearing capacity can reach 90MPa, the elastic compensation can be still carried out when the separation amount of the working flange reaches 30 percent of compression amount, and the effective seal is realized.
Drawings
FIG. 1 is a schematic structural view in axial cross-section of the present invention;
FIG. 2 is a schematic structural view of a C-shaped housing of the present invention;
FIG. 3 is a schematic view of the head and tail ends of the spring core of the present invention;
FIG. 4 is a schematic illustration of the pre-load condition of the present invention during assembly;
FIG. 5 is a schematic view of the assembled state of the present invention;
FIG. 6 is a schematic view of the invention in an assembled state;
FIG. 7 is a schematic cross-sectional view of the open outer side of the C-shaped housing;
FIG. 8 is a schematic sectional view of the C-shaped housing with the opening facing upward;
FIG. 9 is a schematic cross-sectional view of the outwardly angled side of the opening of the C-shaped housing;
FIG. 10 is a schematic view of an axial cross-section of an axially long oval C-shaped housing;
FIG. 11 is a schematic view of an axial cross-section of a radially major axis oval C-shaped housing;
FIG. 12 is a schematic view of a C-shaped housing having a generally rectangular profile;
FIG. 13 is a schematic view of a C-shaped housing having a generally triangular profile;
FIG. 14 is a schematic view (one) of the overall contour of the C-shaped housing being an irregular shape;
fig. 15 is a schematic view (two) of the overall contour of the C-shaped housing being an irregular shape.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
It will be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed or removable connections or integral connections; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1-9, the spring energy storage sealing structure for the planar flange comprises a first flange, a second flange and a sealing element 3 which are assembled together, wherein a first assembling surface 1 is arranged on the end surface of the first flange, a second assembling surface 2 is arranged on the end surface of the second flange, a sealing groove 21 with a closed contour matched with the sealing element 3 is formed in the second assembling surface 2, the sealing element 3 comprises a C-shaped outer shell 31 and an inner core spring 32 arranged in the C-shaped outer shell 31, the C-shaped outer shell 31 is integrally of a closed contour, the inner core spring 32 is a lining, the C-shaped outer shell 31 is tightly wrapped on the outer side of the inner core spring 32, the C-shaped outer shell 31 is provided with a circumferential opening 311, the included angle alpha of the opening 311 is 40-90 degrees, the opening 311 faces to the side with higher medium pressure during working, the first, the structure of any axial section when the second flange and the sealing member 3 are assembled together is as follows: the upper side of the C-shaped shell 31 keeps contact with the first flange 1 and forms a first sealing surface, the lower side of the C-shaped shell 31 keeps contact with the bottom surface of the sealing groove 21 and forms a second sealing surface, the left side and the right side of the C-shaped shell 31 respectively keep a gap with the sealing groove 21, the outer diameter of one end of the inner core spring 32 is gradually reduced and screwed into the inner diameter of the other end, and the inner core spring 32 is an integral spring connected end to end.
As shown in fig. 12-15, the profile shape of the C-shaped housing is adapted to the requirements of the flat flange assembly: the contour shape of the C-shaped housing may be circular, oval, triangular, rectangular, and other irregular shapes.
Wherein the wire diameter r of the core spring 32sWall thickness h of C-shaped housing 31cEqual, 0.2 mm-0.6 mm.
Wherein, C shape shell 31 adopts the superalloy material, and specifically speaking, the material of C shape shell and inner core spring is relevant according to the medium temperature: the medium temperature is less than or equal to 870 ℃, and the material grade is selected to be GH 4141; the medium temperature is less than or equal to 730 ℃, and the material grade is selected to be GH 4738; the medium temperature is less than or equal to 630 ℃, and the material grade is selected to be GH 4169; the medium temperature is less than or equal to 450 ℃, and the material grade is GH 4145.
As shown in fig. 1, 10, and 11, the C-shaped housing 31 has a circular or axially-elongated oval or radially-elongated oval profile in axial cross section.
Wherein, the outer contour diameter H of the C-shaped shell 31 is 1.6 mm-5 mm.
Wherein, the outer surface of the C-shaped shell 31 is provided with a high temperature resistant layer and the roughness is less than or equal to Ra0.8 μm.
Wherein, the outer surface of the C-shaped shell 31 is coated with a non-metallic material PTFE (polytetrafluoroethylene) or a soft metal with a silver coating, or the outer surface of the C-shaped shell is coated with a soft metal with a thickness of 0.20 mm-0.25 mm.
As shown in fig. 4, 5 and 6, the spring type energy storage metal sealing structure of the invention is used for sealing and mounting with a first flange and a second flange which are matched with each other, and comprises the following steps:
(1) assembling: the spring type energy storage metal sealing structure is placed in the sealing groove 21 of the second flange, the spring type energy storage metal sealing structure is placed in the center of the sealing groove 21 of the second flange, and the radial gaps between the spring type energy storage metal sealing structure and the two wall surfaces of the sealing groove 21 of the second flange are uniform;
(2) pre-tightening: and (3) tightening the bolts for assembling the first flange and the second flange to uniformly and axially compress the first assembling surface 1 of the first flange close to the assembling surface 2 of the second flange, wherein the outer surface of the C-shaped shell 31 is in contact with the first assembling surface 1 of the first flange.
(3) Screwing: the bolt is continuously screwed, the sealing element 3 is subjected to axial pressure, the gap between the first assembling surface 1 and the second assembling surface 2 is reduced to be nearly zero, the spring inner core 32 is pressed at the moment, the C-shaped shell 31 is enabled to be tightly attached to the sealing groove 21, the spring inner core 32 plays a supporting role, the inner core spring 32 is pressed, the C-shaped shell 31 is enabled to be tightly attached to the sealing groove 21, and the C-shaped shell, the first assembling surface 1 and the bottom surface of the sealing groove 21 form high contact pressure;
(4) the work is as follows: under the action of system medium pressure, the first flange or/and the second flange deform to generate certain relative separation, the gap is increased, the gap between the first assembling surface 1 and the second assembling surface 2 is h ', the sealing compression amount is h, generally 0< h' is less than or equal to 30% h, the inner side of the C-shaped shell 31 receives the medium pressure and the supporting force of the spring inner core 32, the included angle alpha of the opening 311 is increased, the C-shaped shell 31 recovers a part of deformation to generate self-tightening effect and still keeps close contact with the first assembling surface 1 to ensure good sealing, the C-shaped shell 31 and the first flange form an annular first sealing surface 1, and meanwhile, the outer surface of the C-shaped shell 31 is in close contact with the bottom of the sealing groove 21 of the second flange to form an annular second sealing surface; although the separation amount h 'of the flange is different when the device works at low temperature and high temperature, the spring type energy storage metal sealing structure meets the requirement that the separation amount h' is less than 0 and less than or equal to 30 percent h.
In use, the spring loaded metal seal is mounted in the planar flange seal groove and when the core spring 32 is compressed, the C-shaped housing 31 is urged against the seal groove, thereby forming a seal. The inner core spring 32 provides elasticity for the C-shaped shell 31, makes up material abrasion and offset or eccentricity of matched parts, and system pressure can also assist the C-shaped shell to store energy, and a constant and lasting pre-tightening force is formed by the elasticity of the inner core spring 32 and the system pressure, so that effective sealing is realized.
The above disclosure is only for the specific embodiment of the present invention, but the embodiment of the present invention is not limited thereto, and any variations that can be made by those skilled in the art should fall within the scope of the present invention.
Claims (10)
1. A spring energy storage sealing structure for a planar flange comprises a first flange, a second flange and a sealing element (3) which are assembled together, wherein the end face of the first flange is provided with a first assembling face (1), and the end face of the second flange is provided with a second assembling face (2);
the method is characterized in that: a sealing groove (21) with a closed contour matched with the sealing element (3) is formed in the second assembling surface (2);
the sealing element (3) comprises a C-shaped outer shell (31) and an inner core spring (32) arranged in the C-shaped outer shell (31), the C-shaped outer shell (31) is integrally of a closed outline, the inner core spring (32) is a lining, the C-shaped outer shell (31) is tightly wrapped on the outer side of the inner core spring (32), the C-shaped outer shell (31) is provided with a circumferential opening (311), the included angle alpha of the opening (311) is 40-90 degrees, and the opening (311) faces to the side with higher medium pressure in working;
when the first flange, the second flange and the sealing element (3) are assembled together, the structure of any axial section is as follows: the upper side of the C-shaped shell (31) keeps contact with the first flange (1) and forms a first sealing surface, the lower side of the C-shaped shell (31) keeps contact with the bottom surface of the sealing groove (21) and forms a second sealing surface, and the left side and the right side of the C-shaped shell (31) respectively keep gaps with the sealing groove (21);
the inner core spring (32) is a spring connected end to end, and the outer diameter of one end of the inner core spring (32) is gradually reduced and screwed into the inner diameter of the other end.
2. A spring energy-storage sealing structure for a planar flange according to claim 1, wherein: the inner core spring (32) is composed of a plurality of sections of springs connected end to end, the head end of each section of spring is a diameter-changing part, and the outer diameter of the diameter-changing part is gradually reduced so as to be screwed into the tail end of the adjacent spring.
3. A spring energy-storage sealing structure for a planar flange according to claim 1, wherein: the diameter r of the spring wire of the core spring (32)sThe wall thickness h of the C-shaped housing (31)cEqual, 0.2 mm-0.6 mm.
4. A spring energy-storage sealing structure for a planar flange according to claim 1, wherein: the C-shaped shell (31) is made of high-temperature alloy materials.
5. A spring energy-storage sealing structure for a planar flange according to claim 1, wherein: the contour of the axial section of the C-shaped shell (31) is circular, axially long-axis elliptical or radially long-axis elliptical.
6. A spring energy-storage sealing structure for a planar flange according to claim 1, wherein: the outer contour diameter H of the C-shaped shell (31) is 1.6 mm-5 mm.
7. A spring energy storage sealing structure for a planar flange according to claim 6, wherein: the outer surface of the C-shaped shell (31) is provided with a high temperature resistant layer, and the roughness is less than or equal to Ra0.8 mu m.
8. A spring energy-storage sealing structure for a planar flange according to claim 1, wherein: the outer surface of the C-shaped shell (31) is sprayed and coated with non-metallic material PTFE (polytetrafluoroethylene).
9. A spring energy-storage sealing structure for a planar flange according to claim 1, wherein: the outer surface of the C-shaped shell (31) is subjected to spraying and soft metal electroplating treatment, and the thickness of the soft metal electroplating is 0.20-0.25 mm.
10. A matching installation method of a spring type energy storage sealing structure is characterized in that: a method for cooperatively installing a spring energy storage sealing structure for a planar flange according to any one of claims 1 to 9, comprising the steps of:
(1) assembling: assembling the sealing element (3) into the sealing groove (21) of the second flange, wherein radial gaps between the sealing element (3) and two wall surfaces of the sealing groove (21) of the second flange are uniform;
(2) pre-tightening: screwing bolts for assembling the first flange and the second flange, and enabling the first assembling surface (1) of the first flange to be close to the second assembling surface (2) of the second flange uniformly and axially, wherein the compression amount is h;
(3) screwing: the bolt is continuously screwed, the sealing element (3) bears axial pressure, and the gap between the first assembling surface (1) and the second assembling surface (2) is reduced to be nearly zero;
(4) the work is as follows: the first flange or/and the second flange are deformed to generate certain relative separation, the gap is increased, the gap between the first assembly surface (1) and the second assembly surface (2) is h ', generally 0< h' is less than or equal to 30% h, the inner side of the C-shaped shell (31) is subjected to medium pressure and the supporting force of the spring inner core (32), compared with the included angle alpha of the opening (311) in the step (3), the C-shaped shell (31) recovers a part of deformation to generate self-tightening effect, and the C-shaped shell and the first assembly surface (1) are kept in tight contact.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011462116.9A CN112524364A (en) | 2020-12-11 | 2020-12-11 | Spring energy storage sealing structure for planar flange and matching installation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011462116.9A CN112524364A (en) | 2020-12-11 | 2020-12-11 | Spring energy storage sealing structure for planar flange and matching installation method |
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| CN112524364A true CN112524364A (en) | 2021-03-19 |
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| CN202011462116.9A Pending CN112524364A (en) | 2020-12-11 | 2020-12-11 | Spring energy storage sealing structure for planar flange and matching installation method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0364407A2 (en) * | 1988-10-13 | 1990-04-18 | Hubert Bösch | Sealing for valves or flanges, especially for vacuum application |
| JPH0488771U (en) * | 1984-06-06 | 1992-07-31 | ||
| CN102168757A (en) * | 2011-02-01 | 2011-08-31 | 宁波天生密封件有限公司 | C-shaped cladding sealing ring of built-in spring and manufacturing method thereof |
| CN202851945U (en) * | 2012-07-16 | 2013-04-03 | 成都凯天电子股份有限公司 | Self-tightening type metal C-shaped sealing ring |
| CN103075587A (en) * | 2013-01-17 | 2013-05-01 | 中国科学院上海应用物理研究所 | Dual-sealing flange |
| WO2016052165A1 (en) * | 2014-10-03 | 2016-04-07 | 三菱電線工業株式会社 | Spring-loaded c-ring |
| CN207297707U (en) * | 2017-04-21 | 2018-05-01 | 广东锐阳科技有限公司 | A kind of oil seal spring |
| CN108131517A (en) * | 2016-12-01 | 2018-06-08 | 中核苏阀科技实业股份有限公司 | A kind of flange sealing structure for being suitable for bearing external and internal pressure simultaneously |
-
2020
- 2020-12-11 CN CN202011462116.9A patent/CN112524364A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0488771U (en) * | 1984-06-06 | 1992-07-31 | ||
| EP0364407A2 (en) * | 1988-10-13 | 1990-04-18 | Hubert Bösch | Sealing for valves or flanges, especially for vacuum application |
| CN102168757A (en) * | 2011-02-01 | 2011-08-31 | 宁波天生密封件有限公司 | C-shaped cladding sealing ring of built-in spring and manufacturing method thereof |
| CN202851945U (en) * | 2012-07-16 | 2013-04-03 | 成都凯天电子股份有限公司 | Self-tightening type metal C-shaped sealing ring |
| CN103075587A (en) * | 2013-01-17 | 2013-05-01 | 中国科学院上海应用物理研究所 | Dual-sealing flange |
| WO2016052165A1 (en) * | 2014-10-03 | 2016-04-07 | 三菱電線工業株式会社 | Spring-loaded c-ring |
| CN108131517A (en) * | 2016-12-01 | 2018-06-08 | 中核苏阀科技实业股份有限公司 | A kind of flange sealing structure for being suitable for bearing external and internal pressure simultaneously |
| CN207297707U (en) * | 2017-04-21 | 2018-05-01 | 广东锐阳科技有限公司 | A kind of oil seal spring |
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Application publication date: 20210319 |