CN210531796U - Marine gas double-wall corrugated pipe - Google Patents
Marine gas double-wall corrugated pipe Download PDFInfo
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- CN210531796U CN210531796U CN201921448614.0U CN201921448614U CN210531796U CN 210531796 U CN210531796 U CN 210531796U CN 201921448614 U CN201921448614 U CN 201921448614U CN 210531796 U CN210531796 U CN 210531796U
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- 238000003466 welding Methods 0.000 claims abstract description 111
- 239000007789 gas Substances 0.000 claims description 111
- 230000008719 thickening Effects 0.000 claims description 37
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 239000002737 fuel gas Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 38
- 239000003345 natural gas Substances 0.000 description 19
- 230000008569 process Effects 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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Abstract
The utility model discloses a marine gas double-walled bellows and welding method thereof, marine gas double-walled bellows include: the inner corrugated pipe and the outer corrugated pipe are welded between the gas inlet end flange and the gas outlet end flange and are sleeved together, the gas inlet end flange and the gas outlet end flange are of an integrated structure, an inner annular wall and an outer annular wall are arranged on one side of the flange body of each flange, the length of the inner annular wall is larger than that of the outer annular wall, the inner annular wall is welded with the inner corrugated pipe, and the outer annular wall is welded with the outer corrugated pipe; the flange with the integrated structure enables the inner corrugated pipe and the outer corrugated pipe to be supported through the flange body, the integral rigidity of the gas double-wall corrugated pipe is improved, the inner corrugated pipe is not easy to vibrate relative to the outer corrugated pipe, the risk of vibration of a welding seam is reduced, and the safety is improved; the welding method adopts an outer welding seam mode, even if the radial size of the gas double-wall pipe is smaller, the welding operation can be conveniently carried out, and the problem that the operation is inconvenient when an inner welding seam is formed by welding from the inner cavity of the inner corrugated pipe is solved.
Description
Technical Field
The utility model relates to a gas engine technical field for boats and ships, concretely relates to marine gas double-walled bellows.
Background
In recent years, with the increasing awareness of the international society about environmental protection, the use of clean energy has become an irreversible trend. The maritime department puts forward more strict requirements on ship emission, and natural gas has obvious advantages in the aspects of reducing cost and reducing the emission of nitrogen oxides and sulfur oxides as a clean energy source, so that the gas engine is widely applied to the field of ships. The natural gas engine that boats and ships used requires that all natural gas transmission line and storage structure all to make double-walled structure, and the natural gas transports or stores in sealed inner wall structure promptly, and the outer wall that the outer package one deck is sealed of inner wall structure again, and in case the natural gas of inner wall has the leakage, the natural gas can not leak outside the cabin, but leaks in the middle of the outer wall, has the circulated air in the middle of the outer wall of boats and ships, takes away the natural gas that leaks to guarantee boats and ships safe operation.
At present, as shown in fig. 1, the gas double-wall bellows structure used in the ship in the prior art is that an inner bellows 30 is welded on an inner flange 10, an outer bellows 40 is welded on an outer flange 20, and then the inner bellows 30 is inserted into the outer bellows 40, that is, the inner flange 10 connected with the inner bellows 30 and the outer flange 20 connected with the outer bellows 40 are two-body structures, that is, two independent flanges, and the disadvantage of the gas double-wall structure is that: there is no support between the inner bellows 30 and the outer bellows 40, the overall rigidity of the gas double-walled structure is low, the inner bellows 30 may vibrate, and after a long time, there is a risk that the weld is vibrated away.
Therefore, the gas double-wall structure used by the ship brings certain difficulty to the design, production and processing of the whole system. Particularly, for a gas double-wall pipe on a multipoint injection natural gas engine, the front end of the gas double-wall pipe is connected with a high-pressure natural gas storage rail pipe, the rear end of the gas double-wall pipe is connected with an air inlet manifold of an engine cylinder, natural gas is injected to the last conveying pipeline of the engine cylinder from the natural gas high-pressure rail pipe, the multipoint injection engine is provided with the natural gas injection double-wall pipe, the radial size cannot be too large, if the size is too large, the size of an inner cavity is too large, the natural gas has dead time in the inner cavity, and further the engine response is slow. The outer diameter of the inner pipe is generally designed to be less than 35mm, and the outer diameter of the outer pipe is generally designed to be less than 60 mm; however, such a thin radial dimension of the double-wall pipe, especially the inner pipe with a smaller inner cavity dimension, is small in operation space when welding the inner pipe and the flange, and is very inconvenient for welding operation, so that how to conveniently realize welding operation under the condition of ensuring the smaller radial dimension of the double-wall pipe is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the first technical problem to be solved by the present invention is: the marine gas double-wall corrugated pipe is high in overall rigidity, reduces the risk of vibration of welding seams, and improves the safety of ships.
Based on a general inventive concept, the second technical problem to be solved by the present invention is: provides a welding method of a marine gas double-wall corrugated pipe with convenient welding operation.
For solving the first technical problem, the technical scheme of the utility model is that: marine gas double-walled bellows, the marine gas double-walled bellows includes: the gas pipeline comprises an inner corrugated pipe and an outer corrugated pipe which are sleeved together, wherein the inner cavity of the inner corrugated pipe is a gas cavity for gas to flow, the outer cavity between the inner corrugated pipe and the outer corrugated pipe is an air cavity for air to flow, the gas pipeline also comprises a gas inlet end flange and a gas outlet end flange, and the gas inlet end flange and the gas outlet end flange are of an integrated structure;
the fuel gas inlet end flange and the fuel gas outlet end flange respectively comprise flange bodies, an inner annular wall and an outer annular wall are arranged on one side of each flange body, the length of the inner annular wall is larger than that of the outer annular wall, the inner annular wall is connected with the inner corrugated pipe in a welded mode, and the outer annular wall is connected with the outer corrugated pipe in a welded mode.
Inner corrugated pipe thickening rings are fixedly arranged on the inner sides of the two ends of the inner corrugated pipe respectively, and the inner corrugated pipe thickening rings are welded and connected with the inner annular wall; outer corrugated pipe thickened rings are fixedly arranged on the inner sides of the two ends of the outer corrugated pipe respectively, and the outer corrugated pipe thickened rings are connected with the outer ring wall in a welding mode.
Wherein the inner diameter of the outer bellows thickening ring is equal to the outer diameter of the inner bellows.
The inner corrugated pipe thickening ring and the inner ring wall are in the same diameter at the welding position on one side of the gas inlet end flange, and an outer welding seam is formed by butt welding the inner corrugated pipe thickening ring and the inner ring wall; the outer corrugated pipe thickened ring and the outer ring wall are equal in diameter at the welding position, and an outer welding seam is formed by butt welding the outer corrugated pipe thickened ring and the outer ring wall.
The inner corrugated pipe thickened ring and the inner ring wall are in the same diameter at the welding position on one side of the gas outlet end flange, and an outer welding seam is formed by butt welding the inner corrugated pipe thickened ring and the inner ring wall; the inner diameter of the outer corrugated pipe thickening ring is equal to the outer diameter of the outer ring wall, and the outer corrugated pipe thickening ring and the outer ring wall are welded in an overlapping mode to form an outer welding seam.
The gas injection pipe is arranged on the other side of the gas outlet end flange, the pipe end of the gas injection pipe is closed, and a plurality of gas injection holes are formed in the pipe wall of the gas injection pipe.
And the flange body of the gas outlet end flange is provided with an air suction hole communicated with the air cavity. The leaked natural gas is taken away by the circulated air, thereby ensuring the safe operation of the ship
Wherein the outer diameter of the outer corrugated pipe is less than 60mm, and the outer diameter of the inner corrugated pipe is less than 35 mm.
In order to solve the second technical problem, the technical solution of the present invention is: the welding method of the marine gas double-wall corrugated pipe comprises the following steps:
s10, welding the outlet end of the inner corrugated pipe and the inner annular wall of the gas outlet end flange to form an outer welding seam A;
s20, sleeving the outer corrugated pipe on the inner corrugated pipe, and sliding the outer corrugated pipe towards the direction of the gas outlet end flange to enable one end of the outer corrugated pipe to be lapped on the outer annular wall of the gas outlet end flange, and enable the inlet end of the inner corrugated pipe to be exposed out of the other end of the outer corrugated pipe;
s30, welding the inlet end of the inner corrugated pipe and the inner ring wall of the gas inlet end flange to form an outer welding seam B;
s40, sliding the outer corrugated pipe back, welding one end of the outer corrugated pipe and the outer ring wall of the gas outlet end flange to form an outer welding seam C, and welding the other end of the outer corrugated pipe and the outer ring wall of the gas inlet end flange to form an outer welding seam D.
The outer welding seam A, the outer welding seam B and the outer welding seam D are butt welding seams, and the outer welding seam C is a lap welding seam.
After the technical scheme is adopted, the beneficial effects of the utility model are as follows:
because the utility model discloses a marine gas double-walled bellows, include: the fuel gas inlet end flange and the fuel gas outlet end flange are of an integrated structure, namely the fuel gas inlet end flange is an integrated part, the fuel gas outlet end flange is an integrated part, both flanges are provided with an inner annular wall and an outer annular wall on one side of the flange body, the length of the inner annular wall is greater than that of the outer annular wall, the inner annular wall is welded with the inner corrugated pipe, and the outer annular wall is welded with the outer corrugated pipe; the flange of adoption integral type structure for can support through the flange body between interior bellows and the outer bellows, improve the bulk rigidity of gas double-walled bellows, even work for a long time, interior bellows also can not vibrate for outer bellows, has reduced the risk that the welding seam shakes open, has improved boats and ships security.
Because the utility model discloses a marine gas double-walled bellows welding method, what form in the inner ring wall welding step of the exit end of inner bellows and gas outlet end flange is the outer weld; in the step of sleeving the outer corrugated pipe on the inner corrugated pipe and sliding the outer corrugated pipe towards the direction of the flange of the gas outlet end, one end of the outer corrugated pipe is lapped on the outer annular wall of the flange of the gas outlet end, so that the inlet end of the inner corrugated pipe is exposed out of the other end of the outer corrugated pipe, and conditions are created for welding the inlet end of the inner corrugated pipe and the inner annular wall of the flange of the gas inlet end to form an outer welding seam in the subsequent step; after the welding of the two ends of the inner corrugated pipe is finished, the two ends of the outer corrugated pipe can be conveniently welded with the outer ring walls of the two flanges respectively to form outer welding seams after the outer corrugated pipe slides back; the whole welding process adopts the welding mode of the outer welding seam, even if the radial size of the gas double-wall pipe on the multi-point jet natural gas engine is smaller, the welding operation can be conveniently carried out, and the problem that the inner welding seam is inconvenient to operate when the inner cavity of the inner corrugated pipe stretches into the welding gun to weld in the prior art is solved.
Drawings
FIG. 1 is a schematic cross-sectional view of a prior art gas fired double wall bellows structure;
fig. 2 is a schematic cross-sectional view of a marine gas double-walled bellows structure according to an embodiment of the present invention:
fig. 3 is a schematic view of step S10 of the welding method of the marine gas double-wall corrugated pipe according to the embodiment of the present invention;
fig. 4 is a schematic view of step S20 of the welding method of the marine gas double-wall corrugated pipe according to the embodiment of the present invention;
fig. 5 is a schematic view of step S30 of the welding method of the marine gas double-wall corrugated pipe according to the embodiment of the present invention;
fig. 6 is a schematic view of step S40 of the welding method of the marine gas double-wall corrugated pipe according to the embodiment of the present invention;
in the figure: 10-an inner flange; 20-an outer flange; 30-inner bellows; 40-external bellows;
1-a gas inlet end flange; 11-inner annular wall; 12-outer annular wall; 2-inner bellows; 21-inner bellows thickening ring; 22-inner bellows thickening ring; 3-an outer bellows; 31-outer bellows thickening ring; 32-outer bellows thickening ring; 4-a gas outlet end flange; 41-inner annular wall; 42-outer annular wall; 43-air extraction holes; 44-a gas injection pipe; 441-a gas injection hole; 5-a loose flange; a-an outer weld; b-outer weld; c-outer weld; d-outer weld seam.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
For convenience of description, one end of the gas inlet is defined as an inlet end, and one end of the gas outlet is defined as an outlet end.
As shown in fig. 2, the utility model discloses marine gas double-walled bellows of embodiment includes: the inner corrugated pipe 2 and the outer corrugated pipe 3 are welded between the gas inlet end flange 1 and the gas outlet end flange 4 and sleeved together. The inner cavity of the inner corrugated pipe 3 is a fuel gas cavity for flowing fuel gas, and the outer cavity between the inner corrugated pipe 2 and the outer corrugated pipe 3 is an air cavity for flowing air. Wherein, gas inlet end flange 3, gas outlet end flange 4 are the integral type structure, and gas inlet end flange 1 is an integral part promptly, and gas outlet end flange 4 is an integral part. The flange 1 at the gas inlet end comprises a flange body, an inner annular wall 11 and an outer annular wall 12 are arranged on one side of the flange body, the length of the inner annular wall 11 is larger than that of the outer annular wall 12, conditions are created for convenient welding, the inner annular wall 11 is welded with the inner corrugated pipe 2, and the outer annular wall 12 is welded with the outer corrugated pipe 3. The gas outlet end flange 4 comprises a flange body, an inner ring wall 41 and an outer ring wall 42 are arranged on one side of the flange body, the length of the inner ring wall 411 is larger than that of the outer ring wall 42, conditions are created for convenient welding, the inner ring wall 41 is connected with the inner corrugated pipe 2 in a welding mode, and the outer ring wall 42 is connected with the outer corrugated pipe 3 in a welding mode.
Wherein, because the wall thickness of the corrugated pipe is thinner, in order to improve the pipe end strength and the weldability of the corrugated pipe, an inner corrugated pipe thickening ring 21 and an inner corrugated pipe thickening ring 22 are respectively and fixedly arranged at the inner sides of the two ends of the inner corrugated pipe 2, the inner corrugated pipe thickening ring 21 is welded with the inner ring wall 11 of the gas inlet end flange 1, and the inner corrugated pipe thickening ring 22 is welded with the inner ring wall 4 of the gas outlet end flange 4, for example, laser welding; an outer corrugated pipe thickening ring 31 and an outer corrugated pipe thickening ring 32 are fixedly arranged on the inner sides of two ends of the outer corrugated pipe 3 respectively, the outer corrugated pipe thickening ring 31 is connected with the outer ring wall 12 of the gas inlet end flange 1 in a welding mode, and the outer corrugated pipe thickening ring 32 is connected with the outer ring wall 42 of the gas outlet end flange 4 in a welding mode.
In order to facilitate the welding process, the outer bellows 3 is sleeved outside the inner bellows 2 and can slide, and the inner diameters of the outer bellows thickening ring 31 and the outer bellows thickening ring 32 are preferably equal to the outer diameter of the inner bellows 2.
Wherein, on one side of the flange 1 at the gas inlet end, the inner corrugated pipe thickened ring 21 and the inner ring wall 11 have equal diameter and equal wall thickness at the welding position, and the inner corrugated pipe thickened ring 21 and the inner ring wall 11 form an outer welding seam through butt welding; the outer corrugated pipe thickened ring 31 and the outer annular wall 12 are equal in diameter and equal in wall thickness at the welding position, and an outer welding seam is formed by butt welding the outer corrugated pipe thickened ring 31 and the outer annular wall 12. Furthermore, the inner corrugated pipe thickening ring 21 and the outer corrugated pipe thickening ring 31 are optimally designed into stepped rings, the large-diameter section meets the requirements of the thickness and the strength of the end of the thickened corrugated pipe, and the small-diameter section has good heat dissipation performance during welding due to the fact that the wall thickness of the annular wall of the flange is equal to the wall thickness of the annular wall of the flange, and welding quality can be improved.
Wherein, on one side of the gas outlet end flange 4, the inner corrugated pipe thickened ring 22 and the inner annular wall 41 have equal diameter and equal wall thickness at the welding position, and the inner corrugated pipe thickened ring 22 and the inner annular wall 41 form an outer welding seam through butt welding; similarly, the inner bellows thickening ring 22 is further optimized as a stepped ring. The outer corrugated pipe thickening ring 32 is optimally designed to be an equal-thickness ring, the inner diameter of the outer corrugated pipe thickening ring 32 is equal to the outer diameter of the outer ring wall 42, the outer corrugated pipe thickening ring 32 is convenient to overlap the outer ring wall 42 and can slide along the outer ring wall 42 in the welding process, and the outer corrugated pipe thickening ring 32 and the outer ring wall 42 form an outer welding seam through lap welding.
Wherein, the other side of the gas outlet end flange 4 is provided with a gas injection pipe 44, the pipe end of the gas injection pipe 44 is closed, and the pipe wall of the gas injection pipe 44 is provided with a plurality of gas injection holes 441. After application to a multiple injection natural gas engine, the gas injection lines 44 are inserted into the intake manifold of the engine cylinders. Wherein, be provided with the aspirating hole 43 with the air cavity intercommunication on the flange body of gas outlet end flange 4, be connected with the aspiration pump device, take away the natural gas that leaks through the air of circulation, guarantee boats and ships safe operation. The periphery of the gas outlet end flange 4 is also provided with a movable flange 5, so that the connection with an engine is facilitated.
The outer diameter of the outer corrugated pipe 3 is less than 60mm, the outer diameter of the inner corrugated pipe 2 is less than 35mm, and the radial dimension requirements of the natural gas injection double-wall pipe for the multi-point injection engine are particularly suitable.
Wherein, above-mentioned gas inlet end flange 1, gas outlet end flange 4, interior bellows 2, outer bellows 3 all preferably adopt stainless steel.
The utility model discloses welding method of marine gas double-walled bellows, including following step:
and step S10, as shown in FIG. 3, welding the inner corrugated pipe thickening ring 22 at the outlet end of the inner corrugated pipe 2 and the inner annular wall 41 of the gas outlet end flange 4 to form an outer welding seam A.
And step S20, as shown in fig. 4, the outer bellows 3 is fitted over the inner bellows 2, the outer bellows 3 is slid toward the gas outlet flange 4, the outer bellows thickening ring 32 at one end of the outer bellows 3 is fitted over the outer annular wall 4 of the gas outlet flange 4, and the inner bellows thickening ring 21 at the inlet end of the inner bellows 2 is exposed from the outer bellows thickening ring 31 at the other end of the outer bellows 3.
And step S30, as shown in FIG. 5, welding the inner corrugated pipe thickening ring 21 at the inlet end of the inner corrugated pipe 2 and the inner ring wall 11 of the gas inlet end flange 1 to form an outer welding seam B, and finishing welding the inner corrugated pipe 2 and the flange.
And step S40, as shown in fig. 6, sliding the outer bellows 3 back, welding the outer bellows thickening ring 32 at one end of the outer bellows 3 to the outer annular wall 42 of the gas outlet end flange 4 to form an outer weld C, welding the outer bellows thickening ring 31 at the other end of the outer bellows 3 to the outer annular wall 11 of the gas inlet end flange 1 to form an outer weld D, and ending the whole welding process.
Wherein, the outer welding seam A, the outer welding seam B and the outer welding seam D are butt welding seams, and the outer welding seam C is a lap welding seam.
The four welding seams of the whole welding process all adopt the welding mode of the outer welding seam, even if the radial size of the gas double-wall pipe on the multi-point jet natural gas engine is small, the welding operation can be conveniently carried out, and the problem that the inner welding seam is inconvenient to operate when the inner cavity of the inner corrugated pipe stretches into the welding gun to be welded in the prior art is solved.
Claims (8)
1. Marine gas double-walled bellows, the marine gas double-walled bellows includes: the gas pipeline comprises an inner corrugated pipe and an outer corrugated pipe which are sleeved together, wherein the inner cavity of the inner corrugated pipe is a gas cavity for gas to flow, and the outer cavity between the inner corrugated pipe and the outer corrugated pipe is an air cavity for air to flow;
the fuel gas inlet end flange and the fuel gas outlet end flange respectively comprise flange bodies, an inner annular wall and an outer annular wall are arranged on one side of each flange body, the length of the inner annular wall is larger than that of the outer annular wall, the inner annular wall is connected with the inner corrugated pipe in a welded mode, and the outer annular wall is connected with the outer corrugated pipe in a welded mode.
2. The marine gas double-wall corrugated pipe according to claim 1, wherein inner corrugated pipe thickened rings are fixedly arranged on the inner sides of the two ends of the inner corrugated pipe respectively, and the inner corrugated pipe thickened rings are welded with the inner annular wall; outer corrugated pipe thickened rings are fixedly arranged on the inner sides of the two ends of the outer corrugated pipe respectively, and the outer corrugated pipe thickened rings are connected with the outer ring wall in a welding mode.
3. The marine gas double wall corrugated pipe of claim 2, wherein the inner diameter of the outer corrugated pipe thickened ring is equal to the outer diameter of the inner corrugated pipe.
4. The marine gas double-wall corrugated pipe according to claim 2, wherein on the side of the gas inlet end flange, the inner corrugated pipe thickened ring and the inner annular wall are equal in diameter at the welding position, and the inner corrugated pipe thickened ring and the inner annular wall are welded by butt welding to form an outer welding seam; the outer corrugated pipe thickened ring and the outer ring wall are equal in diameter at the welding position, and an outer welding seam is formed by butt welding the outer corrugated pipe thickened ring and the outer ring wall.
5. The marine gas double-wall corrugated pipe according to claim 4, wherein the inner corrugated pipe thickened ring and the inner ring wall are equal in diameter at a welding position on one side of the gas outlet end flange, and an outer welding seam is formed by butt welding the inner corrugated pipe thickened ring and the inner ring wall; the inner diameter of the outer corrugated pipe thickening ring is equal to the outer diameter of the outer ring wall, and the outer corrugated pipe thickening ring and the outer ring wall are welded in an overlapping mode to form an outer welding seam.
6. The marine gas double-wall corrugated pipe according to claim 1, wherein a gas injection pipe is provided at the other side of the gas outlet end flange, a pipe end of the gas injection pipe is closed, and a plurality of gas injection holes are provided at a pipe wall of the gas injection pipe.
7. A marine gas double-walled bellows according to claim 1, wherein the flange body of the gas outlet end flange is provided with a suction hole communicating with the air chamber.
8. The marine gas double wall corrugated pipe of claim 1, wherein the outer diameter of the outer corrugated pipe is below 60mm, and the outer diameter of the inner corrugated pipe is below 35 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921448614.0U CN210531796U (en) | 2019-08-31 | 2019-08-31 | Marine gas double-wall corrugated pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921448614.0U CN210531796U (en) | 2019-08-31 | 2019-08-31 | Marine gas double-wall corrugated pipe |
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| CN210531796U true CN210531796U (en) | 2020-05-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110454622A (en) * | 2019-08-31 | 2019-11-15 | 山东利川动力科技有限公司 | Combustion gas double-wall corrugated pipe peculiar to vessel and its welding method |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110454622A (en) * | 2019-08-31 | 2019-11-15 | 山东利川动力科技有限公司 | Combustion gas double-wall corrugated pipe peculiar to vessel and its welding method |
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Effective date of registration: 20210621 Address after: Landlord of No.4 Shengrui Industrial Park, no.6555 Baotong East Street, Zhujing community, Qingchi street, high tech Zone, Weifang City, Shandong Province Patentee after: WEIFANG LICHUANG ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: Room 2007, building B2, blue wisdom Valley enlightenment star incubator, 6888 Health East Street, high tech Zone, Weifang City, Shandong Province, 261061 Patentee before: Shandong Lichuan Power Technology Co.,Ltd. |
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