CN209801142U - Low-energy-consumption argon production system - Google Patents
Low-energy-consumption argon production system Download PDFInfo
- Publication number
- CN209801142U CN209801142U CN201920035472.9U CN201920035472U CN209801142U CN 209801142 U CN209801142 U CN 209801142U CN 201920035472 U CN201920035472 U CN 201920035472U CN 209801142 U CN209801142 U CN 209801142U
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- China
- Prior art keywords
- special
- argon
- vacuum
- stop valve
- check valve
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- Expired - Fee Related
Links
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000005265 energy consumption Methods 0.000 title claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims abstract description 53
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000007789 gas Substances 0.000 claims abstract description 27
- 238000003860 storage Methods 0.000 claims abstract description 27
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 10
- 238000009413 insulation Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000009835 boiling Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Abstract
The utility model discloses a low energy consumption argon gas production system, including heat exchange mechanism, thermostated container and filling mechanism, heat exchange mechanism includes the box, be equipped with four special joints that the structure is the same on the box, the left side the special joint passes through the vacuum heat-insulating pipe and communicates with the export at thick argon tower top, the top the special joint communicates with the vacuum heat-insulating pipe of installing the vacuum pump, install check valve two on the vacuum heat-insulating pipe between vacuum pump and the special joint of top, the right side the special joint passes through conveying mechanism and nitrogen gas storage jar intercommunication, check valve three is installed in the position of deviating to the compressor; the method has the advantages that equipment for increasing pressure and reducing temperature is not required to be provided, the energy consumption of argon production is reduced, the cost is saved, the desired argon is obtained in the production process, other valuable oxygen and nitrogen are obtained, and the production economic benefit is improved.
Description
Technical Field
The utility model belongs to the technical field of argon gas production, concretely relates to low energy consumption argon gas production system.
Background
Argon is a rare gas which is widely applied in the industry at present, belongs to inert gas with quite inactive property, and can not burn and support combustion. In the welding of special metals, such as aluminum, magnesium, copper and alloys thereof, and stainless steel in the aircraft manufacturing, shipbuilding, nuclear industry and mechanical industry sectors, argon is often used as a welding shielding gas to prevent the weld from being oxidized or nitrided by air. In the aspect of metal smelting, oxygen and argon blowing are important measures for producing high-quality steel. In addition, the smelting of special metals such as titanium, zirconium, germanium and the like and the electronic industry also need to use argon as a protective gas; the existing argon production adopts a pressure swing adsorption method for a long time, the method needs an adsorption tower to maintain a certain pressure in the whole argon production process, and a large amount of energy is consumed in the process of producing argon in large quantities, so that a low-energy-consumption argon production device is necessary to design.
SUMMERY OF THE UTILITY MODEL
the utility model aims to provide a low energy consumption argon gas production system, through introducing the oxygen, nitrogen gas and the argon gas that assemble the thick argon column top into heat exchange mechanism, according to the boiling point of nitrogen gas is minimum (77.35K), let in nitrogen gas in heat exchange mechanism and carry out heat exchange, take out the nitrogen gas in the heat exchange mechanism and collect with the vacuum pump, simultaneously take out the argon gas and the mixed liquid of oxygen in the heat exchange mechanism into the thermostated container with the cryogenic liquid pump, the temperature control of thermostated container is in the intermediate temperature (90.2K-87.3K) that oxygen and argon gas reach the boiling point, because the boiling point of argon gas is higher than the boiling point of oxygen, so gasified argon gas compresses through the compressor from the top of thermostated container and collects in the argon gas storage jar, and liquid oxygen is then taken in the oxygen storage jar by the cryogenic liquid pump from the bottom of thermostated container, separate three kinds of gases well when reducing the energy consumption, the purification and the refining of the gas at the later period are facilitated, and the production cost is saved, so that the problems in the background technology are solved.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a low energy consumption argon gas production system, includes heat exchange mechanism, thermostated container and fills dress mechanism, heat exchange mechanism includes the box, be equipped with four special joints that the structure is the same on the box, the left side special joint passes through the export intercommunication at the adiabatic pipe in vacuum and thick argon tower top, the top special joint with install the adiabatic pipe in vacuum intercommunication of vacuum pump, install check valve two on the adiabatic pipe in vacuum between the special joint in vacuum pump and the top, the right side special joint passes through conveying mechanism and nitrogen gas storage jar intercommunication, the bottom special joint passes through the left side entry intercommunication of coupling mechanism one with the thermostated container, the top export of thermostated container with fill dress mechanism intercommunication, fill dress mechanism and include the compressor, be equipped with stop valve three on the adiabatic pipe in vacuum that compressor entry and thermostated container intercommunication were beaten, be equipped with check valve three and stop valve two on the adiabatic pipe in vacuum of compressor export and argon gas storage jar intercommunication, and the third check valve is arranged at a position deviated to the compressor.
preferably, a first stop valve and a first check valve are arranged on a vacuum heat insulation pipe between the crude argon tower and the heat exchange mechanism, and the first stop valve is arranged at a position deviated from the crude argon tower.
preferably, a temperature sensor and a pressure sensor are installed in the box body, a conical structure is arranged at the bottom inside the box body of the heat exchange mechanism, the special joint comprises a special nut, a groove structure is arranged at the end of the special joint, a sealing ring is installed in the groove structure, a special nut is sleeved outside the special joint, an internal thread is arranged at the end, deviating from the box body, of the special nut, the internal thread is in threaded connection with an external thread on the outer wall of the vacuum heat insulation pipe at the corresponding position, an internal convex structure is arranged at the end, deviating from the box body, of the special nut, and the internal convex structure is in clearance fit with the special joint.
Preferably, conveying mechanism includes the air pump, the input and the output of air pump pass through the adiabatic pipe in vacuum and communicate with nitrogen gas storage jar and box respectively, install stop valve four on the adiabatic pipe in vacuum between air pump and the nitrogen gas storage jar, be equipped with check valve four on the adiabatic pipe in vacuum between the special joint on air pump and box right side.
Preferably, coupling mechanism one is the same with the second structure of coupling mechanism, coupling mechanism two includes the cryogenic liquids pump, be equipped with stop valve five on the adiabatic pipe in vacuum of cryogenic liquids pump input end, install check valve five and stop valve six on the adiabatic pipe in vacuum of cryogenic liquids pump output end, stop valve six is installed in partial oxygen storage jar entry position.
Preferably, the structure of the check valve III is the same as that of the check valve I, the check valve II, the check valve IV and the check valve V, and the structure of the stop valve II is the same as that of the stop valve I, the stop valve III, the stop valve IV, the stop valve V and the stop valve VI.
Compared with the prior art, the beneficial effects of the utility model are that:
1. Equipment for increasing pressure and reducing temperature is not required, and the cost is saved while the energy consumption of argon production is reduced;
2. In the production process, the desired argon is obtained, and other valuable oxygen and nitrogen are obtained simultaneously, so that the production economic benefit is improved;
3. the argon, the nitrogen and the oxygen are conveniently collected and stored respectively, and convenience is provided for the following gas purification process.
Drawings
Fig. 1 is a schematic structural view of the present invention;
Fig. 2 is a schematic view of a heat exchange mechanism of the present invention;
Fig. 3 is a schematic view of a special joint according to the present invention.
In the figure: 1. a crude argon column; 2. a vacuum heat-insulating pipe; 21. a first stop valve; 22. a one-way valve I; 3. a heat exchange mechanism; 30. a box body; 31. a temperature sensor; 32. a pressure sensor; 33. a vacuum pump; 34. a second one-way valve; 35. a tapered structure; 36. a special joint; 361. a special nut; 362. a groove structure; 363. a seal ring; 4. a thermostat; 5. a conveying mechanism; 51. a one-way valve IV; 52. an air pump; 53. a stop valve IV; 6. a filling mechanism; 61. a compressor; 62. a one-way valve III; 63. a second stop valve; 64. a third stop valve; 7. a first connecting mechanism; 8. a second connecting mechanism; 81. a one-way valve V; 82. a cryogenic liquid pump; 83. a fifth stop valve; 84. a stop valve six; 9. a nitrogen storage tank; 10. argon gas storage tank; 11. an oxygen storage tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: a low-energy-consumption argon production system comprises a heat exchange mechanism 3, a thermostat 4 and a filling mechanism 6, wherein the heat exchange mechanism 3 comprises a box body 30, four special joints 36 with the same structure are arranged on the box body 30, the left special joint 36 is communicated with an outlet at the top of a crude argon tower 1 through a vacuum heat-insulating pipe 2, the top special joint 36 is communicated with the vacuum heat-insulating pipe 2 provided with a vacuum pump 33, a check valve II 34 is arranged on the vacuum heat-insulating pipe 2 between the vacuum pump 33 and the top special joint 36, the right special joint 36 is communicated with a nitrogen storage tank 9 through a conveying mechanism 5, the bottom special joint 36 is communicated with a left inlet of the thermostat 4 through a connecting mechanism I7, a top outlet of the thermostat 4 is communicated with the filling mechanism 6, the filling mechanism 6 comprises a compressor 61, a stop valve III 64 is arranged on the vacuum heat-insulating pipe 2 communicated with the thermostat 4 through the, the vacuum heat insulation pipe 2 with the outlet of the compressor 61 communicated with the argon storage tank 10 is provided with a check valve III 62 and a stop valve II 63, and the check valve III 62 is arranged at the position deviated to the compressor 61.
Specifically, a first stop valve 21 and a first check valve 22 are arranged on a vacuum heat insulation pipe 2 between the crude argon tower 1 and the heat exchange mechanism 3, and the first stop valve 21 is arranged at a position deviated from the crude argon tower 1; the reverse flow of the mixed liquefied gas conveyed from the crude argon column 1 to the heat exchange means 3 is avoided.
Specifically, a temperature sensor 31 and a pressure sensor 32 are installed in the box body 30, and the temperature sensor 31 and the pressure sensor 32 are respectively electrically connected with corresponding display instruments, so that the temperature and the pressure of the mixed gas subjected to heat exchange in the box body 30 can be well controlled; the box body 30 is made of a vacuum heat insulation plate with good heat insulation effect, and a conical structure 35 is arranged at the bottom inside the box body 30, so that liquid nitrogen can be conveniently output from the bottom; the special joint 36 comprises a special nut 361, a groove structure 362 is arranged at the end part of the special joint 36, a sealing ring 363 is installed in the groove structure 362, the special nut 361 is sleeved outside the special joint 36, an internal thread is arranged at the end part of the special nut 361 deviating from the box body 30 and is in threaded connection with an external thread on the outer wall of the vacuum heat-insulating pipe 2 at the corresponding position, an internal convex structure is arranged at the end part of the special nut 361 deviating from the box body 30 and is in clearance fit with the special joint 36; the groove structure 362 and the sealing ring 363 improve the sealing effect, and the special nut 361 is provided with a plane groove, so that the butt joint locking operation with the vacuum heat-insulating pipe 2 is facilitated, and the sealing temperature is ensured.
Specifically, the conveying mechanism 5 comprises an air pump 52, the input end and the output end of the air pump 52 are respectively communicated with the nitrogen storage tank 9 and the box body 30 through a vacuum heat insulation pipe 2, a stop valve IV 53 is installed on the vacuum heat insulation pipe 2 between the air pump 52 and the nitrogen storage tank 9, and a check valve IV 51 is arranged on the vacuum heat insulation pipe 2 between the air pump 52 and the special joint 36 on the right side of the box body 30; the check valve IV 51 prevents the mixture gas in the tank 30 from flowing back into the nitrogen storage tank 9 well, and the check valve IV 53 facilitates control of the nitrogen storage tank 9 during start-up and shut-down of the heat exchange.
Concretely, coupling mechanism 7 is the same with the second 8 structures of coupling mechanism, and coupling mechanism 8 includes cryogenic liquids pump 82, is equipped with five 83 stop valves on the adiabatic pipe 2 in vacuum of cryogenic liquids pump 82 input, installs five 81 check valves and six 84 stop valves on the adiabatic pipe 2 in vacuum of cryogenic liquids pump 82 output, and six 84 stop valves are installed in 11 entry positions of partial oxygen storage jar, and the adiabatic pipe 2 in vacuum has fine thermal-insulated effect, takes place the gasification when avoiding carrying liquid gas.
Specifically, the structure of the check valve III 62 is the same as that of the check valve I22, the check valve II 34, the check valve IV 51 and the check valve V81, and the structure of the stop valve II 63 is the same as that of the stop valve I21, the stop valve III 64, the stop valve IV 53, the stop valve V83 and the stop valve VI 84, so that the interchangeability of parts of the device is improved, the installation is facilitated, and the later maintenance is facilitated.
the working principle is as follows: introducing liquid oxygen, nitrogen and argon gathered at the top of the crude argon tower 1 into a heat exchange mechanism 3, conveying pure nitrogen stored in a nitrogen storage tank 9 into the tank 30 for heat exchange through an air pump 52 in a tank body 30 of the heat exchange mechanism 3, stopping the operation of the air pump 52 when the condition of nitrogen gasification is reached through numerical values displayed by display instruments respectively corresponding to a temperature sensor 31 and a pressure sensor 32 in the tank body 30 according to the lowest boiling point (77.35K) of the nitrogen, simultaneously locking a stop valve IV 53, and pumping gaseous nitrogen in the tank body 30 out from a special joint 36 at the top by using a vacuum pump 33 and collecting the gaseous nitrogen into the storage tank;
Meanwhile, the mixed liquid of argon and oxygen in the box body 30 is pumped into the constant temperature box 4 by the low-temperature liquid pump 82, the temperature of the constant temperature box 4 is controlled to be at the intermediate temperature (90.2K-87.3K) when the oxygen and the argon reach the boiling point, the boiling point of the argon is higher than the boiling point of the oxygen, so that the gasified argon is compressed and collected in the argon storage tank 10 from the top of the constant temperature box 4 through the compressor 61, the liquid oxygen is pumped into the oxygen storage tank from the bottom of the constant temperature box 4 by the low-temperature liquid pump 82, the three gases are well separated while the energy consumption is reduced, the gas purification and refining at the later stage are facilitated, and the production cost is saved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a low energy consumption argon gas production system, includes heat exchange mechanism (3), thermostated container (4) and fills dress mechanism (6), its characterized in that: the heat exchange mechanism (3) comprises a box body (30), four special joints (36) with the same structure are arranged on the box body (30), the left side is formed in a way that the special joints (36) are communicated with an outlet at the top of a crude argon tower (1) through a vacuum heat insulation pipe (2), the top is formed in a way that the special joints (36) are communicated with the vacuum heat insulation pipe (2) provided with a vacuum pump (33), a check valve II (34) is arranged on the vacuum heat insulation pipe (2) between the vacuum pump (33) and the top special joints (36), the right side is formed in a way that the special joints (36) are communicated with a nitrogen storage tank (9) through a conveying mechanism (5), the bottom is formed in a way that the special joints (36) are communicated with a left inlet of a constant temperature box (4) through a connecting mechanism I (7), a top outlet of the constant temperature box (4) is communicated with a filling mechanism (6), and, the vacuum heat insulation pipe (2) that compressor (61) entry and thermostated container (4) intercommunication were beaten is equipped with stop valve three (64), be equipped with check valve three (62) and stop valve two (63) on the vacuum heat insulation pipe (2) that compressor (61) export and argon gas storage jar (10) communicate, install in partial pressure compressor (61) position check valve three (62).
2. A low energy argon production system according to claim 1 wherein: a first stop valve (21) and a first one-way valve (22) are installed on a vacuum heat insulation pipe (2) between the crude argon tower (1) and the heat exchange mechanism (3), and the first stop valve (21) is installed at a position deviated from the crude argon tower (1).
3. A low energy argon production system according to claim 1 wherein: the vacuum heat insulation pipe is characterized in that a temperature sensor (31) and a pressure sensor (32) are installed in the box body (30), a conical structure (35) is arranged at the bottom inside the box body (30) of the heat exchange mechanism (3), the special joint (36) comprises a special nut (361), a groove structure (362) is arranged at the end part of the special joint (36), a sealing ring (363) is installed in the groove structure (362), the special nut (361) is sleeved outside the special joint (36), an internal thread is arranged at the end part, deviating from the box body (30), of the special nut (361), the internal thread is in threaded connection with an external thread on the outer wall of the vacuum heat insulation pipe (2) at the corresponding position, an internal convex structure is arranged at the end part, deviating from the box body (30), and the internal convex structure is in clearance fit with the special joint (36.
4. A low energy argon production system according to claim 1 wherein: conveying mechanism (5) include air pump (52), the input and the output of air pump (52) pass through vacuum insulation pipe (2) respectively with nitrogen gas storage jar (9) and box (30) intercommunication, install stop valve four (53) on vacuum insulation pipe (2) between air pump (52) and nitrogen gas storage jar (9), be equipped with check valve four (51) between special joint (36) on air pump (52) and box (30) right side on vacuum insulation pipe (2).
5. A low energy argon production system according to claim 1 wherein: the connecting mechanism I (7) is the same as the connecting mechanism II (8), the connecting mechanism II (8) comprises a low-temperature liquid pump (82), a five-way valve (81) and a six-way valve (84) are installed on a vacuum heat insulation pipe (2) at the output end of the low-temperature liquid pump (82), and the six-way valve (84) is installed at the inlet position of a deviation oxygen storage tank (11).
6. A low energy argon production system according to claim 1 wherein: the structure of the check valve III (62) is the same as that of the check valve I (22), the check valve II (34), the check valve IV (51) and the check valve V (81), and the structure of the stop valve II (63) is the same as that of the stop valve I (21), the stop valve III (64), the stop valve IV (53), the stop valve V (83) and the stop valve VI (84).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920035472.9U CN209801142U (en) | 2019-01-09 | 2019-01-09 | Low-energy-consumption argon production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920035472.9U CN209801142U (en) | 2019-01-09 | 2019-01-09 | Low-energy-consumption argon production system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209801142U true CN209801142U (en) | 2019-12-17 |
Family
ID=68819629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920035472.9U Expired - Fee Related CN209801142U (en) | 2019-01-09 | 2019-01-09 | Low-energy-consumption argon production system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209801142U (en) |
-
2019
- 2019-01-09 CN CN201920035472.9U patent/CN209801142U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191217 |