CN107120521B - Sandwich leading-out structure for low-temperature container - Google Patents
Sandwich leading-out structure for low-temperature container Download PDFInfo
- Publication number
- CN107120521B CN107120521B CN201710309312.4A CN201710309312A CN107120521B CN 107120521 B CN107120521 B CN 107120521B CN 201710309312 A CN201710309312 A CN 201710309312A CN 107120521 B CN107120521 B CN 107120521B
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- Prior art keywords
- pipe section
- inner container
- shell
- section
- straight pipe
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
- F17C3/02—Vessels not under pressure with provision for thermal insulation
- F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
- F17C3/085—Cryostats
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/03—Thermal insulations
- F17C2203/0391—Thermal insulations by vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Packages (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an interlayer leading-out structure for a low-temperature container, which comprises an inner container, a shell, a vacuum isolation sleeve and an leading-out pipe, wherein a vacuum interlayer is formed between the inner container and the shell, the vacuum isolation sleeve is in sealing connection with the shell and is communicated with the vacuum interlayer, one end of the leading-out pipe is connected with the inner container, the other end of the leading-out pipe penetrates out of the shell to form an overhanging part, and a bent pipe body extending towards the cold shrinkage direction of the inner container is arranged in the vacuum isolation sleeve. The outlet pipe can be arranged at a narrower position in the interlayer without reserving a larger space for installing a pipeline in the vacuum interlayer, and the volume of the liner is not influenced. In addition, the convex ring section and the threaded hole are formed in the flange, so that the liner is convenient to insert, and meanwhile, the liner is convenient to perform pressure test before being inserted into the liner, and the performance of the liner is ensured; the pipe body is provided with an upward bent air seal section, so that low-temperature liquid can be prevented from flowing to the valve end, the heat transfer quantity is reduced, and the heat insulation performance of the low-temperature container is ensured.
Description
Technical Field
The invention relates to the technical field of low-temperature containers, in particular to a sandwich leading-out structure for a low-temperature container.
Background
The low-temperature container is a storage tank for transporting and storing low-temperature liquefied gas, and comprises an inner container for loading low-temperature liquid and a shell arranged outside the inner container, wherein an interlayer is formed between the inner container and the shell, a heat insulating material is filled in the interlayer space and vacuumized to ensure that the low-temperature container has good heat insulating performance, an extraction structure is required to be arranged in the interlayer for loading and unloading the low-temperature liquid, but the interlayer in the prior art is provided with the extraction structure for adapting to expansion and contraction of the inner container, a bent pipeline connected with the inner container is generally arranged in the interlayer space, and the occupied space is large due to bending required by the pipeline, so that a larger space is required to be reserved in the interlayer, and the increase of the volume of the inner container is influenced.
Disclosure of Invention
The present invention aims to solve at least one of the above-mentioned technical problems in the related art to some extent. Therefore, the invention provides a sandwich drawing structure for a low-temperature container, which can set a drawing pipe at a narrow position in a sandwich without affecting the volume of an inner container.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a low temperature container draws forth structure with intermediate layer, includes inner bag, shell and locates the vacuum intermediate layer between inner bag and the shell, still includes:
the vacuum isolation sleeve is in sealing connection with the shell and is communicated with the vacuum interlayer;
one end of the eduction tube is connected with the inner container, the other end of the eduction tube penetrates out of the outer shell to form an overhanging part, and a bent tube body extending towards the cold shrinkage direction of the inner container is arranged in the vacuum isolation sleeve.
As an improvement of the technical scheme, the inner container is connected with the eduction tube through the flange, the flange is provided with a first end welded with the inner container, a second end welded with the eduction tube and a through hole penetrating through the first end and the second end, and the through hole is communicated with the inner container and the eduction tube.
Further, the second end is provided with a convex ring section which is used for being connected with the eduction tube and can be matched with the sealing cover in a sealing way, and a threaded hole for fixing the sealing cover is further formed in the outer side of the convex ring section.
Further, the pipe body is provided with an upwardly curved air seal section.
Further, the pipe body is spiral.
Further, the pipe body is provided with a telescopic corrugated pipe.
Further, the pipe body is provided with a bent pipe section bent downward.
Further, the bent pipe section is connected with the air seal section through a first straight pipe section, the two sides of the first straight pipe section of the pipe body are respectively provided with a second straight pipe section connected with the air seal section and a third straight pipe section connected with the bent pipe section, and the first straight pipe section, the second straight pipe section and the third straight pipe section are distributed in an equilateral triangle.
Further, the second straight pipe section, the air seal section, the first straight pipe section, the bent pipe section and the third straight pipe section are connected through welding.
Further, the first end is welded in the bottom of inner bag, first end is provided with to the sunken discharge tank of flange that runs through of second end, discharge tank and through-hole intercommunication.
The beneficial effects of the invention are as follows: according to the invention, the vacuum isolation sleeve which is in sealing connection with the shell and is communicated with the vacuum interlayer is arranged, and the bent pipe body which extends towards the cold shrinkage direction of the liner is arranged in the vacuum isolation sleeve, so that a larger space installation pipeline is not required to be reserved in the vacuum interlayer, the eduction pipe can be arranged at a narrower position in the interlayer, and the volume of the liner is not influenced. In addition, the convex ring section and the threaded hole are formed in the flange, so that the liner is convenient to insert, and meanwhile, the liner is convenient to perform pressure test before being inserted into the liner, and the performance of the liner is ensured; the pipe body is provided with an upward bent air seal section, so that low-temperature liquid can be prevented from flowing to the valve end, the heat transfer quantity is reduced, and the heat insulation performance of the low-temperature container is ensured.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the structure of an embodiment of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a bottom view of FIG. 1;
FIG. 4 is a schematic view of the structure of a first embodiment of the pipe body of the present invention;
FIG. 5 is a schematic structural view of another embodiment of the present invention;
FIG. 6 is an enlarged view at B in FIG. 5;
FIG. 7 is a bottom view of FIG. 5;
FIG. 8 is a side view of a second embodiment of a tube body in the present invention;
FIG. 9 is a front view of a second embodiment of a tube body in the present invention;
FIG. 10 is a top view of a second embodiment of a tube in the present invention;
FIG. 11 is a top view of a flange in the present invention;
FIG. 12 is a schematic cross-sectional view of a flange in the present invention;
fig. 13 is a schematic view of the configuration of the flange and seal cap of the present invention.
Detailed Description
Referring to fig. 1 to 12, the sandwich drawing structure for a low temperature container of the present invention comprises an inner container 11, a housing 12, a vacuum insulation sleeve 21 and a drawing tube 22, wherein a vacuum sandwich 13 is formed between the inner container 11 and the housing 12, the vacuum insulation sleeve 21 is in sealing connection with the housing 12 and is communicated with the vacuum sandwich 13, one end of the drawing tube 22 is connected with the inner container 11, and the other end of the drawing tube passes through the housing 12 to form an overhanging part, and the overhanging part is provided with a bent tube body extending towards the cold shrinkage direction of the inner container 11 in the vacuum insulation sleeve 21, and the arrow direction in the drawing is the cold shrinkage direction of the inner container 11 with reference to fig. 3 and 7. In the invention, the bent pipe body is arranged in the vacuum isolation sleeve 21 connected with the vacuum interlayer 13, so that a larger space is not required to be reserved in the vacuum interlayer 13 for installing a pipeline, the eduction pipe 22 can be arranged at a narrower position in the interlayer, and the volume of the liner 11 is not influenced.
Referring to fig. 1 and 5, the liner 11 is connected to the delivery tube 22 through a flange 20, and referring to fig. 11 to 13, the flange 20 is provided with a first end welded to the liner 11, a second end welded to the delivery tube 22, and a through hole 201 penetrating the first end and the second end, and the through hole 201 communicates with the liner 11 and the delivery tube 22. The flange 20 serves as a transition joint to reduce stress concentrations. In order to facilitate the liner 11 to be put into the liner, and simultaneously facilitate the liner 11 to be subjected to pressure test before being put into the liner, and ensure the performance of the liner 11, the flange 20 is provided with a convex ring section 202 at the second end, corresponding to the through hole 201, which is used for being connected with the eduction tube 22 and can be in sealing fit with the sealing cover, and the second end is further provided with a threaded hole 203 for fixing the sealing cover outside the convex ring section 202. Before the liner 11 goes into the courage, utilize sealed lid and bolt to seal flange 20, can conveniently carry out the pressure test to the liner 11, simultaneously because flange 20 protrusion inner bag 11 surface size is shorter, dismantle sealed lid and bolt can conveniently draw into shell 12 with the inner bag 11 in, and the setting of bulge loop section 202, make things convenient for the welding of pipeline, guarantee welding quality. Preferably, the through hole 201 is provided with a mounting cavity 2011 at the second end for inserting the extraction tube 22, and the mounting cavity 2011 is provided with a step for positioning the insertion depth of the extraction tube 22. The lead-out pipe 22 is inserted into the installation cavity 2011 and then welded, so that welding quality is guaranteed. The through-hole 201 is provided at a first end with a lead-out port 2012 facilitating medium discharge, the cross-sectional area of the lead-out port 2012 gradually decreasing from the first end to the second end. The outlet 2012 reduces the flow resistance of the medium during discharge, and makes the medium discharge smoother. The outlet 2012 may be circular or trapezoidal in cross-section. The first end is welded to the bottom end of the liner 11, the first end is provided with a discharge chute 204 which is recessed toward the second end and penetrates through the flange 20, and the discharge chute 204 is communicated with the through hole 201. The discharge chute 204 allows the medium in the liner 11 to be discharged as cleanly as possible and allows clean and residual impurities to be discharged.
The pipe body is provided with an upward bent air seal section 221, so that a stable gas-liquid interface is formed between the low-temperature liquid in the container and the heated and gasified gas at the valve end, the low-temperature liquid is prevented from flowing to the valve end, the heat transfer quantity is reduced, and the heat insulation performance of the low-temperature container is ensured.
Referring to fig. 4, in the first embodiment of the tube body according to the present invention, the shape of the tube body is spiral, and a spring-like structure is formed, so that the drawing tube 22 has enough elastic margin to meet the shrinkage amount required for cold shrinkage after the inner container 11 is filled with liquid, thereby greatly reducing the tensile stress, and further ensuring that the connection portion between the drawing tube 22 and the inner container 11 is not pulled apart. Preferably, the tube body is made of a whole stainless steel tube in a bent shape, two ends of the bent tube body are opposite after being wound around two long circle sections, and the two long circle sections form two air seal sections 221, so that the eduction tube 22 has a double air seal function, the length of the eduction tube 22 is increased, the heat transfer quantity is greatly reduced, and good heat insulation performance of the low-temperature container is ensured.
Referring to fig. 8 to 10, in a second embodiment of the tube body according to the present invention, a bellows 222 is provided to ensure that the extension tube 22 has enough elastic margin to meet the shrinkage amount required for cold shrinkage after the inner container 11 is filled with liquid, thereby greatly reducing the tensile stress and further ensuring that the connection portion between the extension tube 22 and the inner container 11 is not pulled apart. The tube body is provided with a bent tube section 223 which is bent downwards, the length of the tube body in the vacuum isolation sleeve 21 is prolonged, the heat transfer quantity is reduced, and the heat insulation performance of the low-temperature container is ensured. The bent pipe section 223 is connected with the air seal section 221 through a first straight pipe section 224, two sides of the first straight pipe section 224 are respectively provided with a second straight pipe section 225 connected with the air seal section 221 and a third straight pipe section 226 connected with the bent pipe section 223, and the first straight pipe section 224, the second straight pipe section 225 and the third straight pipe section 226 are distributed in an equilateral triangle, so that the aesthetic property of the eduction pipe 22 is improved, and the pipe body is compact in structure and small in size. Preferably, the second straight pipe section 225, the air seal section 221, the first straight pipe section 224, the curved pipe section 223, and the third straight pipe section 226 are connected by welding. The size of the eduction tube 22 assembled into the vacuum isolation sleeve 21 can be greatly reduced relative to the integrally bent tube body structure, thereby reducing the size of the vacuum isolation sleeve 21 and the weight of the invention. To facilitate the assembly of the present invention to a cryogenic vessel, the bellows 222 is disposed on a third straight tube section 226. Of course, the bellows 222 may be provided to any one of the first straight pipe section 224, the second straight pipe section 225, the gas seal section 221, or the bent pipe section 223.
The shell 12 is externally provided with a perforation 121 for the eduction tube 22 to pass through, in order to reinforce the shell 12, the shell 12 is welded with a shell reinforcing ring 14 around the perforation 121, and the shell reinforcing ring 14 is welded with the vacuum isolation sleeve 21, so that the shell 12 can be perforated and reinforced, and the weld strength can be increased, and the welding quality can be ensured. Referring to fig. 2, when the outer dimension of the vacuum isolation sleeve 21 is large, the vacuum isolation sleeve 21 is welded after being overlapped with the outer shell 12; referring to fig. 6, when the outer size of the vacuum insulation cover 21 is small, the vacuum insulation is inserted into the through hole 121 and then welded with the outer shell 12, so as to increase the strength of the welding seam and ensure the welding quality.
The eduction tube 22 is welded with the vacuum isolation sleeve 21 through the outlet reinforcing tube 23, the outlet reinforcing tube 23 plays a role in transitional connection, local stress generated by abrupt structural change is reduced as much as possible, and meanwhile, the welding seam strength can be increased and the welding quality can be ensured.
The sandwich extraction structure of the invention can be applied to not only horizontal low-temperature containers but also vertical low-temperature containers, and also low-temperature containers with smaller space between the inner end socket of the liner 11 and the outer end socket of the shell 12.
In the description of the present invention, the terms "first," "second," and the like 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the specific technical features described in the above-described specific embodiments may be combined in any manner without contradiction, and the corrugated tube 222 may be provided to the tube body having a spiral shape to increase the deformation margin of the tube body, etc. the present invention does not require any additional description of various possible combinations for unnecessary repetition, and any combination may be made between different embodiments without departing from the inventive concept of the present invention.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and any modifications or equivalent substitutions without departing from the spirit and scope of the present invention should be covered in the scope of the technical solution of the present invention.
Claims (2)
1. The utility model provides a low temperature container draws forth structure with intermediate layer, includes inner bag, shell and locates the vacuum intermediate layer between inner bag and the shell, its characterized in that still includes:
the vacuum isolation sleeve is in sealing connection with the shell and is communicated with the vacuum interlayer;
the outer shell is provided with an outer shell, one end of the outer shell is connected with an inner container, the outer shell is provided with an outer shell, the outer shell is provided with a bent pipe body extending towards the cold shrinkage direction of the inner container, the inner container is connected with the outer shell through a flange, the flange is provided with a first end welded with the inner container, a second end welded with the outer shell, and a through hole penetrating through the first end and the second end, the through hole is communicated with the inner container and the outer shell, the pipe body is provided with an upward bent air seal section, the second end is provided with a convex ring section corresponding to the through hole and used for being connected with the outer shell and capable of being matched with a sealing cover in a sealing mode, the second end is further provided with a threaded hole used for fixing the sealing cover outside the convex ring section before the inner container is put into the inner container, sealing cover and bolt will the flange is sealed, so that conveniently right the inner bag carries out the pressure test, when dismantling sealed lid and bolt, can make things convenient for the inner bag draws into in the shell, the body is provided with telescopic bellows, the body is provided with the curved pipe section of downwarping, be connected through first straight pipe section between curved pipe section and the atmoseal section, the body is provided with the second straight pipe section that links to each other with the atmoseal section, the third straight pipe section that links to each other with the curved pipe section respectively in first straight pipe section both sides, first straight pipe section, second straight pipe section and third straight pipe section lay with equilateral triangle, first end welds in the bottom of inner bag, first end is provided with the baffle box that is sunken and runs through the flange to the second end, baffle box and through-hole intercommunication.
2. The sandwich extraction structure for a low-temperature container according to claim 1, wherein: the second straight pipe section, the air seal section, the first straight pipe section, the bent pipe section and the third straight pipe section are connected through welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710309312.4A CN107120521B (en) | 2017-05-04 | 2017-05-04 | Sandwich leading-out structure for low-temperature container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710309312.4A CN107120521B (en) | 2017-05-04 | 2017-05-04 | Sandwich leading-out structure for low-temperature container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107120521A CN107120521A (en) | 2017-09-01 |
| CN107120521B true CN107120521B (en) | 2023-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710309312.4A Active CN107120521B (en) | 2017-05-04 | 2017-05-04 | Sandwich leading-out structure for low-temperature container |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107120521B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7080066B2 (en) * | 2018-02-14 | 2022-06-03 | アルバック・クライオ株式会社 | Cryogenic liquefied gas generator |
| CN114252344B (en) * | 2021-12-20 | 2023-04-18 | 北京星际荣耀空间科技股份有限公司 | Low-temperature hydraulic testing device and method for pressure container without heat insulation layer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4674289A (en) * | 1985-06-26 | 1987-06-23 | Andonian Martin D | Cryogenic liquid container |
| CN104676238A (en) * | 2013-11-27 | 2015-06-03 | 张家港中集圣达因低温装备有限公司 | High-vacuum insulation low-temperature vessel |
| CN205806926U (en) * | 2016-05-20 | 2016-12-14 | 江西制氧机有限公司 | A kind of cryogenic liquid pot type container heat insulation layer perforating tube structure |
| CN206072755U (en) * | 2016-08-26 | 2017-04-05 | 新兴能源装备股份有限公司 | Deep cooling vacuum insulation vessel sealing gland pipeline |
| CN206770970U (en) * | 2017-05-04 | 2017-12-19 | 广东建成机械设备有限公司 | A kind of low-temperature (low temperature) vessel interlayer deriving structure |
-
2017
- 2017-05-04 CN CN201710309312.4A patent/CN107120521B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4674289A (en) * | 1985-06-26 | 1987-06-23 | Andonian Martin D | Cryogenic liquid container |
| CN104676238A (en) * | 2013-11-27 | 2015-06-03 | 张家港中集圣达因低温装备有限公司 | High-vacuum insulation low-temperature vessel |
| CN205806926U (en) * | 2016-05-20 | 2016-12-14 | 江西制氧机有限公司 | A kind of cryogenic liquid pot type container heat insulation layer perforating tube structure |
| CN206072755U (en) * | 2016-08-26 | 2017-04-05 | 新兴能源装备股份有限公司 | Deep cooling vacuum insulation vessel sealing gland pipeline |
| CN206770970U (en) * | 2017-05-04 | 2017-12-19 | 广东建成机械设备有限公司 | A kind of low-temperature (low temperature) vessel interlayer deriving structure |
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| Publication number | Publication date |
|---|---|
| CN107120521A (en) | 2017-09-01 |
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Inventor after: Liang Haijun Inventor after: Liang Zhiming Inventor after: Zhao Rongbin Inventor after: Liang Jianling Inventor after: Liang Jiandong Inventor after: Tan Xirong Inventor after: Xu Jianchi Inventor after: Kong Qingyong Inventor after: Zhen Peiquan Inventor before: Liang Haijun Inventor before: Liang Jianling Inventor before: Liang Jiandong Inventor before: Tan Xirong Inventor before: Xu Jianchi Inventor before: Kong Qingyong Inventor before: Zhen Peiquan |
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