CN110594504A - Self-tightening type composite sealing structure - Google Patents
Self-tightening type composite sealing structure Download PDFInfo
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- CN110594504A CN110594504A CN201910770041.1A CN201910770041A CN110594504A CN 110594504 A CN110594504 A CN 110594504A CN 201910770041 A CN201910770041 A CN 201910770041A CN 110594504 A CN110594504 A CN 110594504A
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- tightening
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- 238000007789 sealing Methods 0.000 title claims abstract description 232
- 239000002131 composite material Substances 0.000 title claims abstract description 41
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims description 69
- 239000002184 metal Substances 0.000 claims description 69
- 238000009434 installation Methods 0.000 claims description 6
- 239000007770 graphite material Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 8
- 229910052755 nonmetal Inorganic materials 0.000 abstract description 3
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 37
- 230000007547 defect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
-
- 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
- F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gasket Seals (AREA)
Abstract
The invention relates to a self-tightening type composite static sealing structure, which is a multi-stage self-tightening type composite static sealing structure suitable for a low-temperature liquid rocket engine and belongs to a combined structure adopting a deformed high-temperature alloy steel material substrate and a non-metal compensation layer coated on the surface. The sealing structure belongs to self-tightening sealing and has two sealing points, so that the sealing reliability in low medium pressure is ensured, the leakage rate is unchanged when the medium pressure is improved, the requirement of high and low temperature extreme working environment temperature can be met, reliable sealing in the range of 35K-1000K is realized, and the sealing performance is greatly improved compared with the traditional forced sealing.
Description
Technical Field
The invention relates to an ultralow-temperature high-pressure multistage self-tightening type composite sealing structure which is suitable for a low-temperature liquid rocket engine and belongs to the technical field of spaceflight.
Background
The sealing problem of the low-temperature liquid rocket engine is long-standing, the development of the low-temperature sealing technology is closely connected with the development of the low-temperature liquid rocket engine, and the low-temperature sealing technology is synchronously developed along with the improvement of the technical level of the engine. In the process of developing low-temperature engines developed in China, the low-temperature sealing technology is always focused on. Up to now, the main sealing structure form is a flange tongue-and-groove type sealing gasket structure, which is detailed in high-pressure afterburning liquid oxygen kerosene engine (Shanghai-Guitian national defense industry publishing Co.), the sealing structure adopts a traditional sealing mechanism, and pre-compression is generated on a sealing gasket by pre-tightening a connecting part during installation to form initial sealing, in the working process, the medium separating force and other external loads weaken the connecting effect, the specific sealing pressure is reduced, but the sealing requirement can still be met under the condition of low working pressure of the current engine. By adopting the sealing mode, the required pre-tightening load is larger, and the load born by the connecting bolt and the flange in the loading process is larger. In order to improve and optimize the sealing structure, a rocket engine designer develops structures such as a conical sealing gasket and an O-shaped sealing ring in sequence, but the rocket engine is difficult to popularize due to the defects of the product and the limitation of the size of the structure. So far, the sealing form taking the flat gasket as the main body can still meet the requirements of the in-service engine.
The international advanced aerospace major countries such as russia, usa, etc have long replaced flat gasket structures with self-tightening sealing structures. In the RD-120, RD-0120 engine, we have seen that, in order to improve the sealing effect and reduce the structural weight of the connection parts, the flange connection is converted into a threaded and welded structure, and the flange sealing is replaced by a threaded ferrule seal of a self-tightening seal having a double seal function. In engines such as SSME, RS-68 and J-2X of oxyhydrogen rocket engines in the United states, self-tightening flange sealing structures are adopted, and the sealing structures form commercial standards and can be purchased as standard parts in a customized mode. However, due to technical blockages, domestic self-tightening sealing has not been explored, but has little substantial progress.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the multistage self-tightening type composite sealing structure suitable for the liquid rocket engine is provided, and the leakage rate requirement of the whole engine system can be met.
The technical solution of the invention is as follows: a self-tightening type composite sealing structure comprises a metal sealing base body and an auxiliary sealing layer, wherein the metal sealing base body is composed of a metal sealing ring, an upper sealing ring and a lower sealing ring, the upper sealing ring extends obliquely upwards from the middle part of the inner side of the metal sealing ring, and the lower sealing ring extends obliquely downwards, so that the circumferential section of the metal sealing base body is of a pi-shaped elastic structure; the axial section of the metal sealing ring is wavy, and the auxiliary sealing layer is paved and fixed on the axial section of the metal sealing ring; the self-tightening type composite sealing structure is assembled in a sealing surface formed by a flange component on a sealed medium pipeline; during initial installation, the positions, farthest from the metal sealing ring, of the axial outer sides of the upper sealing ring and the lower sealing ring are respectively used as an upper sealing lip and a lower sealing lip to be in elastic contact with the axial surface of the flange assembly to form first sealing; when the flange assembly is fastened, the self-tightening type composite sealing structure reaches a pre-tightening state, and the auxiliary sealing layer is in contact with the axial surface of the flange assembly to form a second seal; after the internal medium acts on the self-tightening type composite sealing structure, the upper sealing ring and the lower sealing ring expand radially, the first sealing specific pressure is increased, and the metal sealing structure is self-tightening.
The metal sealing substrate is made of metal with yield strength more than or equal to 750 MPa.
The self-tightening composite sealing structure further comprises a compensation layer and an auxiliary sealing layer, wherein the compensation layer covers the outer surface of the metal sealing base body.
The compensation layer is a metal layer plated on the outer surface of the metal sealing base body.
The auxiliary sealing layer is a non-metal layer coated on the outer surface of the metal sealing substrate.
The ratio of the distance between the upper sealing lip and the lower sealing lip to the axial thickness of the metal sealing ring is 1.15-1.4.
The opening angle formed by the upper sealing ring and the lower sealing ring is 10-20 degrees.
The upper sealing lip and the lower sealing lip are annular rings protruding along the axial direction, and the circumferential sections of the annular rings are fan-shaped.
The radius of the fan shape is 0.5-1.5 mm.
The thickness of the compensation layer is 15-40 mu m.
The auxiliary sealing layer 8 is made of flexible graphite material;
the thickness of the auxiliary sealing layer 8 is 0.5-2 mm.
The upper side and the lower side of the metal matrix shaft are provided with tooth-shaped structures.
The tooth-shaped structure is a sawtooth shape with the tooth-shaped height of 0.5mm-2mm, and the number of the sawteeth is at least 5.
Compared with the prior art, the invention has the beneficial effects that:
(1) the metal sealing substrate of the invention has the advantages that the reliability of the sealing structure is gradually improved in the initial state and the working state through two sealing structures;
(2) according to the invention, the metal sealing substrate is covered with the compensation layer, so that the effect of compensating surface defects and improving the sealing reliability is achieved;
(3) the metal sealing substrate is covered with the auxiliary sealing layer to play a role in providing an axial forced sealing point;
(4) the invention belongs to a self-tightening sealing ring, and tests prove that the leakage rate of the sealing ring is not reduced along with the increase of the pressure of a medium, and the leakage rate is basically stable;
(5) the metal sealing ring has the characteristics of low assembly moment and thin flange thickness;
drawings
Fig. 1 is an installation schematic diagram of a self-tightening type composite sealing structure suitable for a cryogenic liquid rocket engine provided by the invention.
In the figure: 1. an upper flange; 2. a lower flange; 3. a seal ring; 4. a connecting bolt; 5. and a hexagonal nut.
Fig. 2 is a schematic cross-sectional structure view of a self-tightening composite sealing structure suitable for a cryogenic liquid rocket engine provided by the invention.
In the figure: 6. a metal substrate; 7. a plating or coating layer; 8. and (4) auxiliary sealing layer.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the present invention provides a multi-stage self-tightening composite sealing structure, which is characterized by comprising a metal sealing substrate 6, a plating layer or coating layer 7 and an auxiliary sealing layer 8, wherein the metal sealing substrate 6 is composed of a metal sealing ring, an upper sealing ring extending from the middle part of the inner side of the metal sealing ring to the upper direction and a lower sealing ring extending to the lower direction, so that the circumferential section of the metal sealing substrate is a pi-shaped elastic structure; the axial section of the metal sealing ring is wavy, and an auxiliary sealing layer 8 is paved and fixed on the axial section of the metal sealing ring; the metal sealing base body is assembled in a sealing groove formed by a flange component on a sealed medium pipeline, the flange component specifically comprises an upper flange 1 and a lower flange 2, the upper flange 1 and the lower flange 2 are both provided with stepped grooves, the upper flange 1 and the lower flange 2 are connected in a matched mode, an annular groove is formed inside the annular groove, and the two sides of the upper flange 1 and the two sides of the lower flange 2 are fastened through a connecting bolt 4 and a hexagonal nut 5. (ii) a During initial installation, the positions, farthest from the metal sealing ring, of the axial outer sides of the upper sealing ring and the lower sealing ring are respectively used as an upper sealing lip and a lower sealing lip to be in elastic contact with the axial surface of the flange assembly to form first sealing; when the flange assembly is fastened, the self-tightening type composite sealing structure reaches a pre-tightening state, and the auxiliary sealing layer is in contact with the axial surface of the flange assembly to form a second seal; after the internal medium acts on the self-tightening type composite sealing structure, the upper sealing ring and the lower sealing ring expand radially, the first sealing specific pressure is increased, and the metal sealing structure is self-tightening.
In order to ensure the strength and provide enough specific sealing pressure, the metal sealing base body is made of metal with the yield strength of 750MPa or more, deformed high-temperature alloy steel (such as GH625, GH37, GH99 and the like) can be selected, the metal sealing ring, the upper sealing ring and the lower sealing ring are integrally designed and are machined, and the specific design size is generally determined by the use environment.
As a further preferable scheme, as shown in fig. 2, the multi-stage self-tightening composite sealing structure further includes a compensation layer covering an outer surface of the metal sealing substrate, and the compensation layer is used for compensating surface defects and improving sealing reliability. The compensation layer may be a metal layer plated on an outer surface of the metal sealing substrate. The plating layer is made of metal materials (such as silver, copper, nickel and the like) which have good ductility and low strength (the yield strength is less than or equal to 100MPa, and the elongation is more than or equal to 50%) and are compatible with the medium.
In order to provide the second axial forced sealing, the multi-stage self-tightening composite sealing structure further comprises an auxiliary sealing layer, and the auxiliary sealing layer covers the zigzag positions of the outer surface of the auxiliary layer. The auxiliary sealing layer can be made of flexible graphite material.
In order to provide enough specific sealing pressure and ensure good fit of the sealing surface, the ratio of the distance between the upper sealing lip and the lower sealing lip to the axial thickness of the metal sealing ring is 1.15-1.4. In one embodiment of the invention, the axial distance between the second seal and the first seal lip is 0.2-1mm, which is determined by the design condition and the sealing medium.
In order to provide enough specific sealing pressure and ensure enough compression of the sealing ring base body, the opening angle formed by the upper sealing ring and the lower sealing ring is 10 degrees-20 degrees.
In order to ensure that the sealing ring substrate has enough strength and meet the requirement of repeated use, the middle part of the sealing ring substrate is an arc, the radius range of the arc is 0.5mm-2mm, and the sealing ring substrate is determined by a processing technology.
In order to ensure that the sealing lip of the sealing ring can be well matched with the sealing surface of the flange and adapt to certain assembly errors, the upper sealing lip and the lower sealing lip are annular rings protruding along the axial direction, the circumferential sections of the annular rings are fan-shaped,
the radius of the fan is 0.5-1.5mm, and the radius of the fan is determined by the design working condition and the sealing medium.
In order to compensate the defects of the sealing surface and improve the sealing reliability, the thickness of the compensation layer is 15-40 mu m, which is determined by the processing technology and the surface roughness of the substrate.
In order to improve the sealing specific pressure of the second seal and improve the sealing reliability, the upper side and the lower side of the metal base body in the axial direction are provided with tooth-shaped structures, the tooth-shaped structures can play a role in fixing the auxiliary sealing layer, and meanwhile, the tooth-shaped structures can improve the contact pressure after contacting with the flange and reduce the leakage of a medium. The tooth-shaped structure is a sawtooth shape with the tooth-shaped height of 0.5mm-2mm, and the number of the sawteeth is at least 5.
The working principle of the multistage self-tightening type composite sealing structure provided by the invention is as follows: the self-tightening type composite sealing structure comprises a metal sealing base body and an auxiliary sealing layer, wherein the metal sealing base body and the auxiliary sealing layer are arranged on the metal sealing base body, the metal sealing base body is composed of a metal sealing ring, an upper sealing ring and a lower sealing ring, the upper sealing ring extends obliquely upwards from the middle part of the inner side of the metal sealing ring, and the lower sealing ring extends obliquely downwards, so that the circumferential section of the metal sealing base body is of a phi-shaped elastic structure; the axial section of the metal sealing ring is wavy, and the auxiliary sealing layer is paved and fixed on the axial section of the metal sealing ring; the self-tightening type composite sealing structure is assembled in a sealing surface formed by a flange component on a sealed medium pipeline; during initial installation, the positions, farthest from the metal sealing ring, of the axial outer sides of the upper sealing ring and the lower sealing ring are respectively used as an upper sealing lip and a lower sealing lip to be in elastic contact with the axial surface of the flange assembly to form first sealing; when the flange assembly is fastened, the self-tightening type composite sealing structure reaches a pre-tightening state, and the auxiliary sealing layer is in contact with the axial surface of the flange assembly to form a second seal; after the internal medium acts on the self-tightening type composite sealing structure, the upper sealing ring and the lower sealing ring expand radially, the first sealing specific pressure is increased, and the metal sealing structure is self-tightening.
Example (b):
the invention designs a multi-stage self-tightening composite sealing structure suitable for a low-temperature liquid rocket engine, which adopts a deformed high-temperature alloy metal matrix, a soft metal (copper or silver and the like) plating layer and a non-metal material (Teflon, F4 and the like) auxiliary sealing layer. Can meet the requirements of ultralow temperature extreme working environment temperature, meet the compatibility of special media (such as hydrogen, oxygen, fuel gas and the like), and realize the vacuum helium leakage rate of not higher than 1x10 under the pressure of normal temperature and 1MPa-9Pa.m3S, low leakage rate under vacuum helium pressure of 40MPa at normal temperature and low temperatureAt 1x10-7Pa.m3This specification is improved by a factor of 100 compared to conventional positive sealing. In addition, the sealing structure can be recycled and reused for 10 times without decomposition (including pressure of 40MPa and ultralow temperature circulation at most). Compared with the traditional bolt pretightening force required by forcibly sealing the sealing ring under the same condition, the bolt pretightening force is reduced by 42 percent, the thickness of the flange is reduced by about 40 percent, and the assembly difficulty and the structure quality are greatly reduced.
Parts of the specification which are not described in detail are within the common general knowledge of a person skilled in the art.
Claims (14)
1. A self-tightening type composite sealing structure is characterized by comprising a metal sealing base body and an auxiliary sealing layer, wherein the metal sealing base body is composed of a metal sealing ring, an upper sealing ring and a lower sealing ring, the upper sealing ring extends obliquely upwards from the middle part of the inner side of the metal sealing ring, and the lower sealing ring extends obliquely downwards, so that the circumferential section of the metal sealing base body is of a phi-shaped elastic structure; the axial section of the metal sealing ring is wavy, and the auxiliary sealing layer is paved and fixed on the axial section of the metal sealing ring; the self-tightening type composite sealing structure is assembled in a sealing surface formed by a flange component on a sealed medium pipeline; during initial installation, the positions, farthest from the metal sealing ring, of the axial outer sides of the upper sealing ring and the lower sealing ring are respectively used as an upper sealing lip and a lower sealing lip to be in elastic contact with the axial surface of the flange assembly to form first sealing; when the flange assembly is fastened, the self-tightening type composite sealing structure reaches a pre-tightening state, and the auxiliary sealing layer is in contact with the axial surface of the flange assembly to form a second seal; after the internal medium acts on the self-tightening type composite sealing structure, the upper sealing ring and the lower sealing ring expand radially, the first sealing specific pressure is increased, and the metal sealing structure is self-tightening.
2. The self-tightening composite seal structure according to claim 1, wherein the metal seal base is made of a metal having a yield strength of 750MPa or greater.
3. The self-clinching composite seal structure of claim 1, further including a compensation layer and an auxiliary seal layer, said compensation layer overlying the outer surface of the metal seal substrate.
4. A self-clinching composite seal structure as claimed in claim 3, wherein said compensating layer is a metal layer plated on the outer surface of the metal seal base.
5. A self-clinching composite seal structure as set forth in claim 3 wherein said secondary seal layer is a non-metallic layer applied to the outer surface of the metal seal substrate.
6. A self-tightening composite seal structure according to any one of claims 1 to 5, wherein the ratio of the distance between the upper seal lip and the lower seal lip to the axial thickness of the metal seal ring is 1.15 to 1.4.
7. A self-tightening composite seal structure according to any one of claims 1 to 5, characterized in that the opening angle formed by the upper seal ring and the lower seal ring is 10 ° to 20 °.
8. A self-tightening composite seal structure according to any one of claims 1 to 5, wherein the upper seal lip and the lower seal lip are annular rings protruding in the axial direction, and the circumferential cross section of the annular rings is a sector.
9. The self-tightening composite seal structure according to claim 2, wherein the radius of the fan shape is 0.5 to 1.5 mm.
10. The self-tightening composite seal structure according to claim 2, wherein the thickness of the compensation layer is 15 to 40 μm.
11. A self-tightening composite sealing structure according to claim 2, wherein the auxiliary sealing layer 8 is made of a flexible graphite material.
12. The self-tightening composite sealing structure according to claim 2, wherein the thickness of the auxiliary sealing layer 8 is 0.5-2 mm.
13. A self-tightening composite seal according to claim 2, wherein the metal base has a castellated structure on both upper and lower sides of the axis.
14. The self-tightening composite seal structure according to claim 14, wherein the tooth structure is a saw-tooth shape having a tooth height of 0.5mm to 2mm, and the number of teeth is at least 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910770041.1A CN110594504A (en) | 2019-08-20 | 2019-08-20 | Self-tightening type composite sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910770041.1A CN110594504A (en) | 2019-08-20 | 2019-08-20 | Self-tightening type composite sealing structure |
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| CN110594504A true CN110594504A (en) | 2019-12-20 |
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| CN201910770041.1A Pending CN110594504A (en) | 2019-08-20 | 2019-08-20 | Self-tightening type composite sealing structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985797A (en) * | 2019-12-31 | 2020-04-10 | 江苏天氟隆防腐设备有限公司 | Fluorine-lined elbow joint |
| CN112728115A (en) * | 2020-12-30 | 2021-04-30 | 苏州宝骅密封科技股份有限公司 | Self-tightening sealing assembly |
| CN112943483A (en) * | 2021-01-26 | 2021-06-11 | 西安航天动力研究所 | Double-channel redundant sealing device of liquid rocket engine |
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| CN110985797A (en) * | 2019-12-31 | 2020-04-10 | 江苏天氟隆防腐设备有限公司 | Fluorine-lined elbow joint |
| CN112728115A (en) * | 2020-12-30 | 2021-04-30 | 苏州宝骅密封科技股份有限公司 | Self-tightening sealing assembly |
| CN112728115B (en) * | 2020-12-30 | 2023-08-15 | 苏州宝骅密封科技股份有限公司 | Self-tightening sealing assembly |
| CN112943483A (en) * | 2021-01-26 | 2021-06-11 | 西安航天动力研究所 | Double-channel redundant sealing device of liquid rocket engine |
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