CN110778911A - Low-temperature gas cylinder liquid oxygen fills dress device - Google Patents
Low-temperature gas cylinder liquid oxygen fills dress device Download PDFInfo
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- CN110778911A CN110778911A CN201911182057.7A CN201911182057A CN110778911A CN 110778911 A CN110778911 A CN 110778911A CN 201911182057 A CN201911182057 A CN 201911182057A CN 110778911 A CN110778911 A CN 110778911A
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- gas cylinder
- temperature gas
- storage tank
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- 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
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
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- 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
- F17C13/04—Arrangement or mounting of valves
-
- 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
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/011—Oxygen
-
- 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
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/013—Single phase liquid
-
- 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
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
- F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
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- 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
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0367—Localisation of heat exchange
- F17C2227/0388—Localisation of heat exchange separate
- F17C2227/039—Localisation of heat exchange separate on the pipes
-
- 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
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/04—Methods for emptying or filling
- F17C2227/041—Methods for emptying or filling vessel by vessel
-
- 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
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/033—Treating the boil-off by recovery with cooling
- F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a liquid oxygen filling device for a low-temperature gas cylinder, and belongs to the technical field of filling of low-temperature gas cylinders. It has solved the gaseous technical problem such as volatilize when current low temperature gas cylinder fills dress. The low-temperature gas cylinder liquid oxygen filling device comprises a liquid oxygen storage tank and a low-temperature gas cylinder, wherein a liquid phase valve and a gas phase valve are respectively arranged on the low-temperature gas cylinder, and a liquid outlet of the liquid oxygen storage tank is connected with the liquid phase valve of the low-temperature gas cylinder through a liquid filling pipeline; this low temperature gas cylinder liquid oxygen fills dress device still includes the liquid nitrogen storage tank, is equipped with respectively on the liquid nitrogen storage tank and goes out liquid valve and admission valve, goes out to be connected with out the liquid nitrogen pipeline on the liquid valve, and liquid fills and is equipped with board-like heat exchanger on the dress pipeline, goes out liquid nitrogen pipeline and passes board-like heat exchanger, and the gaseous phase valve on the low temperature gas cylinder is linked together through evaporating return gas pipeline with the admission valve on the liquid nitrogen storage tank. The invention utilizes the cold energy of the liquid nitrogen to recycle the gas discharged in the filling process of the low-temperature gas cylinder, and utilizes the cold energy of the liquid nitrogen through the plate-type heat exchanger to reduce the vaporization of the liquid oxygen, thereby being convenient and reliable.
Description
Technical Field
The invention belongs to the technical field of filling equipment, and relates to a low-temperature gas cylinder liquid oxygen filling device.
Background
In the prior art, cryogenic gas cylinders for low pressure liquid storage have great advantages both in terms of fill weight and end use compared to conventional gas cylinders for high pressure gas storage. Therefore, cryogenic gas cylinders are increasingly in common use. The low-temperature gas cylinder is generally connected with a low-temperature liquid storage tank through a metal hose, and the low-temperature liquid is filled by utilizing the pressure difference between the low-temperature liquid storage tank and the low-temperature gas cylinder. Because the metal hose can not insulate heat, the low-temperature liquid is gasified in a large amount, the pressure of the low-temperature gas cylinder is increased continuously, in order to keep the pressure difference between the low-temperature liquid storage tank and the low-temperature gas cylinder, the gas with the continuously increased pressure in the low-temperature gas cylinder needs to be released at any time in the filling process to relieve the pressure, a large amount of gas is wasted, the filling time is prolonged, and the potential safety hazard and the loss of gas cold quantity are increased.
Chinese patent (publication number: CN 207880437U; publication date: 2018-09-18) discloses a cold energy recovery device of a low-temperature high-pressure hydrogen storage cylinder, which is arranged in a double-layer hydrogen storage cylinder comprising an inner container and a shell and comprises a heat exchange pipeline and a flow control valve, wherein the heat exchange pipeline is arranged at two sides of a hydrogen outlet pipeline, the flow control valve is arranged at the cylinder mouth of the shell of the cylinder, and the heat exchange pipeline and the gas outlet pipeline are led out of the cylinder through the flow control valve; the heat exchange pipeline is arranged in a W shape in the inner container of the gas cylinder and adopts a fin structure; the flow control valve controls the flow of the gas outlet pipeline; the flow control valve is also communicated with a vacuum pumping pipeline and a vacuum measuring pipeline, and the vacuum pumping pipeline and the vacuum measuring pipeline are arranged on a vacuum heat insulation interlayer between the shell and the inner container.
In the above patent document, the vacuum heat insulating layer is arranged on the double-layer hydrogen storage cylinder, the structure of the cylinder is improved, and although cold quantity can be recovered to a certain degree, the structure of the whole cylinder is complex, the manufacturing cost is high, and the volume of the cylinder with unit storage capacity is large, and the occupied space is large.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-temperature gas cylinder liquid oxygen filling device, which aims to solve the technical problems that: how to save the cold energy and recycle the vaporized gas in the filling process of the liquid oxygen of the low-temperature gas cylinder efficiently and conveniently.
The purpose of the invention can be realized by the following technical scheme:
a low-temperature gas cylinder liquid oxygen filling device comprises a liquid oxygen storage tank and a low-temperature gas cylinder, wherein a liquid phase valve and a gas phase valve are respectively arranged on the low-temperature gas cylinder, and a liquid outlet of the liquid oxygen storage tank is connected with the liquid phase valve of the low-temperature gas cylinder through a liquid filling pipeline; the device is characterized in that the low-temperature gas cylinder liquid oxygen filling device further comprises a liquid nitrogen storage tank, a liquid outlet valve and a gas inlet valve are respectively arranged on the liquid nitrogen storage tank, a liquid outlet pipeline is connected onto the liquid outlet valve, a plate-type heat exchanger is arranged on the liquid filling pipeline, the liquid outlet pipeline penetrates through the plate-type heat exchanger, and a gas phase valve on the low-temperature gas cylinder is communicated with the gas inlet valve on the liquid nitrogen storage tank through an evaporation gas return pipeline.
The working principle is as follows: when liquid oxygen is filled, the liquid oxygen enters the low-temperature gas cylinder from a liquid phase valve of the low-temperature gas cylinder through a liquid filling pipeline from a liquid oxygen storage tank, when the liquid oxygen enters the low-temperature gas cylinder, part of liquid in the low-temperature gas cylinder is heated and vaporized, the volume of the low-temperature gas cylinder is reduced to cause the pressure to rise, the vaporized oxygen is discharged from a gas phase valve of the low-temperature gas cylinder and enters a liquid nitrogen storage tank through an evaporation gas return pipeline, the liquid nitrogen storage tank is at low temperature and normal pressure, a large amount of low-temperature liquid nitrogen is arranged in the liquid nitrogen storage tank, the low-temperature liquid nitrogen exchanges heat with a small amount of; thereby recovering the gas in the filling process; meanwhile, liquid nitrogen in the liquid nitrogen storage tank is transferred into the nitrogen bottle through the liquid nitrogen outlet pipeline, and the liquid nitrogen in the liquid nitrogen pipeline is vaporized to release cold energy and exchanges heat with the liquid filling pipeline in the plate type heat exchanger, so that the cold energy of liquid oxygen is improved, and the vaporization and volatilization of the liquid oxygen are reduced; the whole structure is simple, the manufacturing cost is low, a plurality of filled low-temperature gas cylinders can be simultaneously and correspondingly arranged, the occupied space is small, and the use is convenient; liquid nitrogen is used for recovering gas discharged by filling of a low-temperature gas bottle, and a small filling workshop can generate 30 ten thousand yuan per year.
In the above-mentioned low-temperature gas cylinder liquid oxygen filling apparatus, each of the liquid oxygen storage tanks corresponds to at least two of the low-temperature gas cylinders; the liquid filling pipeline is divided into a plurality of groups of filling branch pipes through multi-way joints, and each group of filling branch pipes is correspondingly connected with a liquid phase valve of the low-temperature gas cylinder; the evaporation gas return pipeline is divided into a plurality of groups of evaporation gas return branch pipes through a multi-way joint, and a gas phase valve of each low-temperature gas cylinder is connected with one group of evaporation gas return branch pipes.
In the low-temperature gas cylinder liquid oxygen filling device, the liquid nitrogen storage tank is a double-layer tank body, the liquid outlet valve is communicated with an inner cavity of the liquid nitrogen storage tank, and the gas inlet valve is communicated with an interlayer cavity of the liquid nitrogen storage tank; the low-temperature gas cylinder is a liquid oxygen dewar tank. The liquid nitrogen storage tank can realize cold energy exchange between liquid nitrogen and oxygen and prevent the liquid nitrogen and the oxygen from being mixed; the liquid oxygen dewar is a super vacuum heat-insulated stainless steel pressure vessel for storing liquid oxygen.
In foretell low temperature gas cylinder liquid oxygen fills device, plate-type heat exchanger is close to fill the dress branch pipe, it is used for connecting the nitrogen cylinder just to go out the liquid nitrogen pipeline and go up to be located the nitrogen cylinder with be equipped with the vaporizer between the plate-type heat exchanger. The liquid nitrogen is gasified in a vaporizer and then filled into a nitrogen bottle.
In the above-mentioned low-temperature gas cylinder liquid oxygen filling device, the filling branch pipe and the evaporation return gas branch pipe are low-temperature hoses.
Compared with the prior art, the gas discharged in the filling process of the low-temperature gas cylinder is recovered by using the cold energy of the liquid nitrogen, the vaporization of liquid oxygen is reduced by using the cold energy of the liquid nitrogen through the plate-type heat exchanger, the whole structure is simpler, the manufacturing cost is low, the gas cylinder filling device can simultaneously correspond to a plurality of low-temperature gas cylinders, the occupied space is small, and the use is convenient.
Drawings
Fig. 1 is a schematic view of the use of the filling device.
In the figure, 1, a liquid oxygen storage tank; 2. a low temperature gas cylinder; 21. a liquid phase valve; 22. a gas phase valve; 3. a liquid-filled conduit; 31. filling a branch pipe; 4. a liquid nitrogen storage tank; 41. a liquid outlet valve; 42. an intake valve; 5. a plate heat exchanger; 6. an evaporation air return pipeline; 61. evaporating the return air branch pipe; 7. a vaporizer; 8. and a liquid nitrogen outlet pipeline.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, the low-temperature gas cylinder liquid oxygen filling device comprises a liquid oxygen storage tank 1 and a low-temperature gas cylinder 2, wherein a liquid phase valve 21 and a gas phase valve 22 are respectively arranged on the low-temperature gas cylinder 2, and a liquid outlet of the liquid oxygen storage tank 1 is connected with the liquid phase valve 21 of the low-temperature gas cylinder 2 through a liquid filling pipeline 3; the low-temperature gas cylinder liquid oxygen filling device further comprises a liquid nitrogen storage tank 4, a liquid outlet valve 41 and a gas inlet valve 42 are respectively arranged on the liquid nitrogen storage tank 4, a liquid outlet pipeline 8 is connected onto the liquid outlet valve 41, a plate-type heat exchanger 5 is arranged on the liquid filling pipeline 3, the liquid outlet pipeline 8 penetrates through the plate-type heat exchanger 5, and a gas phase valve 22 on the low-temperature gas cylinder 2 is communicated with the gas inlet valve 42 on the liquid nitrogen storage tank 4 through an evaporation gas return pipeline 6. Specifically, each liquid oxygen storage tank 1 corresponds to at least two low-temperature gas cylinders 2; the liquid filling pipeline 3 is divided into a plurality of groups of filling branch pipes 31 through multi-way joints, and each group of filling branch pipes 31 is correspondingly connected with a liquid phase valve 21 of a low-temperature gas cylinder 2; the evaporation gas return pipeline 6 is divided into a plurality of groups of evaporation gas return branch pipes 61 through a multi-way joint, and the gas phase valve 22 of each low-temperature gas bottle 2 is connected with one group of evaporation gas return branch pipes 61; the liquid nitrogen storage tank 4 is a double-layer tank body, the liquid outlet valve 41 is communicated with an inner cavity of the liquid nitrogen storage tank 4, and the air inlet valve 42 is communicated with an interlayer cavity of the liquid nitrogen storage tank 4; the low-temperature gas cylinder 2 is a liquid oxygen dewar tank; the plate type heat exchanger 5 is close to the filling branch pipe 31, the liquid nitrogen outlet pipeline 8 is used for connecting a nitrogen bottle, and a vaporizer 7 is arranged on the liquid nitrogen outlet pipeline 8 and between the nitrogen bottle and the plate type heat exchanger 5; the charging branch 31 and the return vapor branch 61 are low temperature hoses in this embodiment.
When liquid oxygen is filled, the liquid oxygen enters the low-temperature gas cylinder 2 from the liquid phase valve 21 of the low-temperature gas cylinder 2 through the liquid filling pipeline 3 from the liquid oxygen storage tank 1, when the liquid oxygen enters the low-temperature gas cylinder 2, the temperature of part of liquid in the low-temperature gas cylinder 2 rises to be vaporized, the pressure in the low-temperature gas cylinder 2 is increased due to the reduction of the volume, the vaporized oxygen is discharged from the gas phase valve 22 of the low-temperature gas cylinder 2 and enters the liquid nitrogen storage tank 4 through the evaporation return gas pipeline 6, the liquid nitrogen storage tank 4 is at low temperature and normal pressure, a large amount of low-temperature liquid nitrogen is arranged in the liquid nitrogen storage tank 4, the low-temperature liquid nitrogen exchanges heat with a; thereby recovering the gas in the filling process; meanwhile, liquid nitrogen in the liquid nitrogen storage tank 4 is transferred into the nitrogen bottle through the liquid nitrogen outlet pipeline 8, and the liquid nitrogen in the liquid nitrogen pipeline is vaporized to release cold energy and exchanges heat with the liquid filling pipeline 3 in the plate type heat exchanger 5, so that the cold energy of liquid oxygen is improved, and the vaporization and volatilization of the liquid oxygen are reduced; the whole structure is simple, the manufacturing cost is low, a plurality of filled low-temperature gas cylinders 2 can be simultaneously and correspondingly arranged, the occupied space is small, and the use is convenient; liquid nitrogen is used for recovering gas discharged by filling the low-temperature gas cylinder 2, and a small filling workshop can generate 30 ten thousand yuan per year.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although 1, liquid oxygen storage tank is used more herein; 2. a low temperature gas cylinder; 21. a liquid phase valve; 22. a gas phase valve; 3. a liquid-filled conduit; 31. filling a branch pipe; 4. a liquid nitrogen storage tank; 41. a liquid outlet valve; 42. an intake valve; 5. a plate heat exchanger; 6. an evaporation air return pipeline; 61. evaporating the return air branch pipe; 7. a vaporizer; 8. liquid nitrogen outlet pipe, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (5)
1. A low-temperature gas cylinder liquid oxygen filling device comprises a liquid oxygen storage tank (1) and a low-temperature gas cylinder (2), wherein a liquid phase valve (21) and a gas phase valve (22) are respectively arranged on the low-temperature gas cylinder (2), and a liquid outlet of the liquid oxygen storage tank (1) is connected with the liquid phase valve (21) of the low-temperature gas cylinder (2) through a liquid filling pipeline (3); the device is characterized in that the low-temperature gas cylinder liquid oxygen filling device further comprises a liquid nitrogen storage tank (4), a liquid outlet valve (41) and a gas inlet valve (42) are arranged on the liquid nitrogen storage tank (4) respectively, a liquid outlet pipeline (8) is connected to the liquid outlet valve (41), a plate-type heat exchanger (5) is arranged on the liquid filling pipeline (3), the liquid outlet pipeline (8) penetrates through the plate-type heat exchanger (5), and a gas phase valve (22) on the low-temperature gas cylinder (2) is communicated with the gas inlet valve (42) on the liquid nitrogen storage tank (4) through an evaporation gas return pipeline (6).
2. The cryogenic gas cylinder liquid oxygen filling apparatus according to claim 1, wherein each of the liquid oxygen storage tanks (1) corresponds to at least two cryogenic gas cylinders (2); the liquid filling pipeline (3) is divided into a plurality of groups of filling branch pipes (31) through a multi-way joint, and each group of filling branch pipes (31) is correspondingly connected with a liquid phase valve (21) of the low-temperature gas cylinder (2); the evaporation gas return pipeline (6) is divided into a plurality of groups of evaporation gas return branch pipes (61) through multi-way joints, and the gas phase valve (22) of each low-temperature gas cylinder (2) is connected with one group of evaporation gas return branch pipes (61).
3. The filling device of the low-temperature gas cylinder with liquid oxygen as claimed in claim 2, characterized in that the liquid nitrogen storage tank (4) is a double-layer tank body, the liquid outlet valve (41) is communicated with the inner cavity of the liquid nitrogen storage tank (4), and the gas inlet valve (42) is communicated with the interlayer cavity of the liquid nitrogen storage tank (4); the low-temperature gas cylinder (2) is a liquid oxygen dewar tank.
4. The liquid oxygen filling device for the low-temperature gas cylinder according to claim 3, characterized in that the plate heat exchanger (5) is close to the filling branch pipe (31), the liquid nitrogen outlet pipe (8) is used for connecting a nitrogen gas cylinder, and a vaporizer (7) is arranged on the liquid nitrogen outlet pipe (8) and between the nitrogen gas cylinder and the plate heat exchanger (5).
5. The cryogenic gas cylinder liquid oxygen filling device according to claim 4, characterized in that the filling branch pipe (31) and the evaporation return gas branch pipe (61) are cryogenic hoses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911182057.7A CN110778911A (en) | 2019-11-27 | 2019-11-27 | Low-temperature gas cylinder liquid oxygen fills dress device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911182057.7A CN110778911A (en) | 2019-11-27 | 2019-11-27 | Low-temperature gas cylinder liquid oxygen fills dress device |
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| Publication Number | Publication Date |
|---|---|
| CN110778911A true CN110778911A (en) | 2020-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911182057.7A Pending CN110778911A (en) | 2019-11-27 | 2019-11-27 | Low-temperature gas cylinder liquid oxygen fills dress device |
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| Country | Link |
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| CN (1) | CN110778911A (en) |
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2019
- 2019-11-27 CN CN201911182057.7A patent/CN110778911A/en active Pending
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Effective date of registration: 20220105 Address after: 317000 southeast of line A3, Linhai Park, chemical API base, Taizhou City, Zhejiang Province Applicant after: ZHEJIANG HAICHANG GAS Co.,Ltd. Address before: No. 391, Dongfang Avenue, Linhai, Taizhou, Zhejiang Applicant before: ZHEJIANG HAITIAN GAS Co.,Ltd. |
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Address after: 317000 No. 755, Dongdu South Road, Linhai City, Taizhou City, Zhejiang Province (for office use only) (self declaration) Applicant after: Zhejiang Haichang Gas Co.,Ltd. Address before: 317000 southeast of line A3, Linhai Park, chemical API base, Taizhou City, Zhejiang Province Applicant before: ZHEJIANG HAICHANG GAS Co.,Ltd. |