JP6300970B2 - 多重管冷却保冷庫 - Google Patents
多重管冷却保冷庫 Download PDFInfo
- Publication number
- JP6300970B2 JP6300970B2 JP2017030383A JP2017030383A JP6300970B2 JP 6300970 B2 JP6300970 B2 JP 6300970B2 JP 2017030383 A JP2017030383 A JP 2017030383A JP 2017030383 A JP2017030383 A JP 2017030383A JP 6300970 B2 JP6300970 B2 JP 6300970B2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchange
- brine solution
- tube
- storage space
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001816 cooling Methods 0.000 title description 7
- 239000012267 brine Substances 0.000 claims description 132
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 132
- 239000000243 solution Substances 0.000 claims description 106
- 239000003507 refrigerant Substances 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims 1
- 238000007710 freezing Methods 0.000 description 17
- 230000008014 freezing Effects 0.000 description 17
- 230000004048 modification Effects 0.000 description 16
- 238000012986 modification Methods 0.000 description 16
- 150000003839 salts Chemical class 0.000 description 6
- 239000002826 coolant Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 235000013305 food Nutrition 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 210000000056 organ Anatomy 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 244000144972 livestock Species 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000011151 fibre-reinforced plastic Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- -1 organic acid salt Chemical class 0.000 description 2
- 238000002054 transplantation Methods 0.000 description 2
- 235000013311 vegetables Nutrition 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229920006248 expandable polystyrene Polymers 0.000 description 1
- 235000019688 fish Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 235000014102 seafood Nutrition 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/005—Devices using other cold materials; Devices using cold-storage bodies combined with heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D9/00—Devices not associated with refrigerating machinery and not covered by groups F25D1/00 - F25D7/00; Combinations of devices covered by two or more of the groups F25D1/00 - F25D7/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
- F28D7/103—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of more than two coaxial conduits or modules of more than two coaxial conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
- F28D7/14—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically both tubes being bent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
- F28F1/325—Fins with openings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F23/00—Features relating to the use of intermediate heat-exchange materials, e.g. selection of compositions
- F28F23/02—Arrangements for obtaining or maintaining same in a liquid state
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0042—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for foodstuffs
-
- 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
- Y02E60/14—Thermal energy storage
Description
前記第1の熱交換管は、前記板状フィンを貫通していることが好ましい。
1’ 保冷庫
1a 保冷庫
1a’ 保冷庫
1b 保冷庫
1c 保冷庫
2 筐体
2a 前面壁
2b 背面壁
2c 上面壁
2d 底面壁
2e 右側面壁
2f 左側面壁
3 熱交換管
3’ 熱交換管
3a 外管
3b 内管
3c 接続部材
3d 湾曲部分
3e 中管
4 ブライン溶液供給管
5 冷媒供給管
6 冷凍機
7 キャスター
8 取手
9 板状フィン
10 板
11 スリット
31 第1の熱交換管
32 第2の熱交換管
32a 外管
32b 内管
33 第3の熱交換管
34 第4の熱交換管
A1 ブライン槽
A2 ブライン槽
L1 ブライン溶液(第1のブライン溶液)
L2 冷媒
L3 ブライン溶液(第3のブライン溶液)
P1 ポンプ
S 収納空間
T1 領域(外管と内管との間)
T2 領域(内管の内部)
T3 領域(中管と内管との間)
W1 隔壁
Claims (5)
- 内部に被保冷物の収納空間を有する筐体と、
前記収納空間内に設けられ、第3のブライン溶液を収容する第1の熱交換管と、
前記第1の熱交換管に供給される前記第3のブライン溶液を収容するブライン槽と、
前記ブライン槽内に設けられた第2の熱交換管と、
を備えた保冷庫であって、
前記第2の熱交換管は、
外面が前記第3のブライン溶液に面した熱伝導性を有する外管と、
前記外管の内部に設けられた内管と、
を備えた多重管であり、
前記外管と前記内管との間には、0℃で凍結しない第1のブライン溶液が収容され、
前記内管の内部には、冷媒が収容されていることを特徴とする保冷庫。 - 前記収納空間内に設けられた複数の板状フィンをさらに備え、
前記第1の熱交換管は、前記板状フィンを貫通していることを特徴とする請求項1に記載の保冷庫。 - 前記収納空間内の空気を前記板状フィンの間に送風する送風手段をさらに備えたことを特徴とする請求項2に記載の保冷庫。
- 前記内管は、耐冷ゴム、プラスチック類、発泡樹脂類、セラミック、又はガラス、を銅、チタン、ステンレス、アルミ、又はアルミ合金で被覆した材料で形成されていることを特徴とする請求項1に記載の保冷庫。
- 前記内管は、内部に空気層を有する多層構造であることを特徴とする請求項1に記載の保冷庫。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17848334.3A EP3511660A4 (en) | 2016-09-08 | 2017-03-22 | COOLING BEARING FOR COOLING A MULTI-LAYER TUBE |
KR1020187037699A KR102272197B1 (ko) | 2016-09-08 | 2017-03-22 | 다중관 냉각 보냉고 |
PCT/JP2017/011315 WO2018047387A1 (ja) | 2016-09-08 | 2017-03-22 | 多重管冷却保冷庫 |
US16/331,481 US10852048B2 (en) | 2016-09-08 | 2017-03-22 | Multilayer pipe cooling cold storage |
CN201780039813.3A CN109416211B (zh) | 2016-09-08 | 2017-03-22 | 多重管冷却冷藏库 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016175691 | 2016-09-08 | ||
JP2016175691 | 2016-09-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2018044755A JP2018044755A (ja) | 2018-03-22 |
JP6300970B2 true JP6300970B2 (ja) | 2018-03-28 |
Family
ID=61692465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2017030383A Active JP6300970B2 (ja) | 2016-09-08 | 2017-02-21 | 多重管冷却保冷庫 |
Country Status (5)
Country | Link |
---|---|
US (1) | US10852048B2 (ja) |
EP (1) | EP3511660A4 (ja) |
JP (1) | JP6300970B2 (ja) |
KR (1) | KR102272197B1 (ja) |
CN (1) | CN109416211B (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110030781B (zh) * | 2019-04-16 | 2024-04-05 | 中国国家铁路集团有限公司 | 基于整体式蓄冷板的保温集装箱及其充冷供冷方法 |
CN113713715A (zh) * | 2021-09-14 | 2021-11-30 | 河北万吉新材料科技有限公司 | 一种液体钙锌稳定剂生产系统 |
WO2024023247A1 (en) * | 2022-07-27 | 2024-02-01 | Swiss Passive Technologies Gmbh | Temperature-controlled container and method for the transport of perishable goods, in particular for land and/or maritime transport |
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KR101285199B1 (ko) * | 2011-10-17 | 2013-07-18 | (주)에이스써모 | 브라인(brine)순환 멀티 냉각방식 P.C.M 축냉 시스템 |
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KR101339125B1 (ko) * | 2012-03-02 | 2013-12-10 | 박혜원 | 다수의 브라인(brine)순환 열교환(Heat Exchange) 코일(Coil)을 활용한 공기순환 냉각방식 P.C.M 축냉 시스템 |
CN203037108U (zh) | 2013-01-08 | 2013-07-03 | 无锡市石油化工设备有限公司 | 钢铝复合管 |
JP6038219B2 (ja) * | 2015-03-31 | 2016-12-07 | ケミカルグラウト株式会社 | 熱交換システム |
CN204923993U (zh) | 2015-07-23 | 2015-12-30 | 四川航天五源复合材料有限公司 | 一种玄武岩纤维空调换热铜管 |
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- 2017-03-22 US US16/331,481 patent/US10852048B2/en active Active
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US20190219322A1 (en) | 2019-07-18 |
KR20190042501A (ko) | 2019-04-24 |
EP3511660A1 (en) | 2019-07-17 |
US10852048B2 (en) | 2020-12-01 |
CN109416211B (zh) | 2021-02-26 |
JP2018044755A (ja) | 2018-03-22 |
EP3511660A4 (en) | 2020-05-20 |
CN109416211A (zh) | 2019-03-01 |
KR102272197B1 (ko) | 2021-07-02 |
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