WO2004088679A2 - Luftentfeuchter für ölisolierte transformatoren, drosselspulen sowie stufenschalter - Google Patents
Luftentfeuchter für ölisolierte transformatoren, drosselspulen sowie stufenschalter Download PDFInfo
- Publication number
- WO2004088679A2 WO2004088679A2 PCT/EP2004/003448 EP2004003448W WO2004088679A2 WO 2004088679 A2 WO2004088679 A2 WO 2004088679A2 EP 2004003448 W EP2004003448 W EP 2004003448W WO 2004088679 A2 WO2004088679 A2 WO 2004088679A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cylinder
- housing
- dehumidifier according
- air
- dehumidifier
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/18—Liquid cooling by evaporating liquids
Definitions
- the invention relates to a dehumidifier as it is used as an accessory for oil-insulated transformers, choke coils or step switches for dehumidifying the air sucked into oil expansion vessels.
- Such a dehumidifier is already known from JP 60198710 A1. It has two identical filter chambers, each filled with moisture-absorbing material. From below, each through a bell arrangement with an oil sump, the sucked-in air flows through at least one of the two filter chambers, passes through the moisture-absorbing material there, is dried and leaves the dehumidifier at the top.
- an electrical heating device is provided in each of the two filter chambers. When the moisture absorption capacity of the moisture-absorbing material in the respective filter chamber is exhausted, the corresponding heating device is switched on and the moisture-absorbing material is thus dried and regenerated.
- An outlet opening is provided in the upper area of each filter chamber for the exit of the heated moisture.
- a further developed dehumidifier has been proposed in European patent application EP 1313112 A1.
- a moisture sensor is arranged in the flow of the dried air after it has passed through the actual filter insert filled with moisture-absorbing material, which, depending on the condition, actuates the heating inside the filter insert.
- the humidity sensor detects the humidity of the air flowing around it, which should already be dry. If the moisture sensor signals that the moisture in the air drawn in exceeds a limit, and is therefore too high, this means that moisture-absorbing material is saturated, can no longer absorb more moisture and must be dried out.
- the electrical circuit of the heating device preferably a resistance heater, is then closed in the filter insert by switching means. As a result, the moisture-absorbing material is heated and thus dried out; the previously bound water should drip down into the open.
- the heated liquid can neither be removed through outlet openings arranged above the heating device nor drips completely downwards. Rather, part of this heated liquid is deposited on the cylindrical inner wall of the filter chamber or housing wall of the dehumidifier in the form of fine droplets. These fine water droplets remain - conditionally through their surface tension - hang there and cannot be removed. This is undesirable because over time the moisture concentration in the area of the inner wall increases continuously. This also falsifies the value determined by the described moisture sensor as the actual value of the moisture in the air surrounding the drying medium for determining the state of this medium.
- the object of the invention is therefore to eliminate the disadvantages of the prior art described and to provide a dehumidifier of the type mentioned which ensures by special measures that the liquid which is heated by actuating a heating device made of moisture-absorbing, regenerable filter material actually leaves the filter arrangement.
- the main advantage of the invention is that the specific, inventive design of the bottom part achieves a defined, locally limited drop below the dew point in the interior of the filter arrangement. A targeted condensation of the baked-out liquid then takes place on this base part, and the liquid condensed there defined and limited locally runs off safely from there.
- Figure 1 shows a complete dehumidifier according to the invention in a lateral, schematic
- FIG. 3 shows the view of a bottom part alone of a further developed further dehumidifier according to the invention from below.
- FIGS. 4-6 show different sectional sectional views of the bottom part shown in FIG.
- the dehumidifier has a base part 1, in which an annular seal 2 is inserted, on which in turn a cylinder 3 rests.
- the cylinder 3 is closed at the top by a cover 4; an annular seal 5 is again provided here for sealing.
- Fastening are vertical studs 6 with screws screwed on at the bottom, outside the base part 1 Knurled nuts 6.1 provided. Screws 7 are provided above as fastening means.
- An air-permeable housing 8 is located centrally in the cylinder 3.
- the housing 8 contains a regenerable granulate 9 as moisture-absorbing material and a heater 10, the heating elements of which are located between the granulate 9, ie are enclosed by the latter.
- the granules 9 are not shown here for the sake of clarity.
- a solenoid valve 12 is provided above the cover 4, and a lower flange 13, to which an upper flange 14 is fastened, is located above the solenoid valve 12.
- Another housing 16 is arranged between the upper flange 14 and a cover 15.
- the lower flange 13 and upper flange 14 are connected to one another by eye bolts 17 and wing nuts 18.
- the upper housing 16 has a specially shaped inner wall 19 which, together with a bell 20 which is fastened in the interior of the housing 16 and is open at the bottom, forms an oil reservoir 21 which is known per se.
- the volume of the oil reservoir 21 is limited by the tulip-shaped inner wall 19.
- a tubular flange 25 is arranged above the cover 15 ; the attachment is again carried out by eye bolts 26 and wing nuts 27, a switch housing 28 is provided on the side, which receives the electrical connections and connecting lines. Furthermore, a moisture sensor 29 is provided laterally within the cylinder 3 in the area of the flow of air. As already explained above, this moisture sensor 29 detects the moisture state of the air flowing around it. If the recorded moisture value exceeds a previously set limit value, this means that the granulate 9 is at least largely saturated, no further moisture is absorbed and must be dried out. In such a case, the electrical circuit of the heater 10 is closed in the switch housing 28 by switching means, not shown. At the same time, the solenoid valve 12 is also closed.
- the granules 9 are heated by the heater 10 and thus dried out.
- the electrical connection lines from both the heater 10 and the moisture sensor 29, which lead through a screw connection 30 to the switch housing 28, are not shown here.
- the switch housing 28 has further screw connections 31 for the connection of electrical connection lines (also not shown) and a power supply.
- FIG. 2 shows sections of the lower part of the dehumidifier in order to better explain the bottom part 1 according to the invention.
- the bottom part 1 is made of metal, is relatively thick and has good specific heat conduction.
- the inner contour 1.1 is funnel-shaped; An opening 1.2 is provided at the lowest point of the funnel in the middle. Through this opening 1.2, the air which is sucked in and still has to be dried reaches the cylinder 3 and subsequently the air-permeable housing 8, in which it passes through the granulate 9 and is dried.
- the cylinder 3 is particularly advantageous to manufacture from a material with poor specific thermal conductivity.
- a lower rounding 1.4 is provided on the inner contour 1.1, so that sharp transitions in the entire inner contour 1.1 are avoided. This promotes the desired complete drainage of the liquid condensed there.
- a screw connection 32 is shown in FIG. 2, which is arranged in the opening 1.2 downward and which will be discussed in more detail below.
- the screw connection 32 here has a sieve insert 33.
- a sieve insert 33 ensures that no dirt particles or other foreign bodies with the sucked-in air or other catfish can get inside the dehumidifier.
- the sieve insert 33 can be made of sintered bronze, for example, whereby, in addition to the filter effect described, additional noise damping is achieved.
- such a sieve insert 33 does not prevent the heated liquid from dripping downward. Under certain climatic conditions, however, there can be a risk of icing in this area at low temperatures. It can therefore be advantageous in many cases to provide additional heating of the bottom part 1 of the dehumidifier according to the invention.
- an annular recess 34 is provided in the bottom part 1, from which a radial threaded bore 35 leads to the outside.
- An electrical heater 36 is arranged in the recess 34. Electrical resistance heating can be used particularly advantageously for this purpose.
- the electrical connection lines 37 of the heater 36 are guided through the threaded bore 35 and a screwed cable gland 38 screwed into them.
- the recess 34 which, as described, receives the heater 36, is closed off by a bottom flange 39.
- the outer connection at the bottom is formed by a cover flange 40 which has a central flange-shaped dust protection 41 which surrounds and protects the screw connection 32.
- the cover flange 40 is fastened by screws 42, 43 which are threaded 44, 45 screwed into the bottom part 1.
- the base part 1 has vertical through bores 46, 47 which serve to receive the stud bolts, not shown here.
- a first insulating washer 48 is provided between base part 1, electrical heater 36 and base flange 39, and a second insulating washer 49 between base part 1 and base flange 39.
- the insulating washers 48, 49 are made, for. B, made of Teflon and thus prevent heating of the other parts of the dehumidifier according to the invention,
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Gases (AREA)
- Air Humidification (AREA)
- Transformer Cooling (AREA)
- Housings And Mounting Of Transformers (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006504945A JP4382807B2 (ja) | 2003-04-04 | 2004-04-01 | 油絶縁変圧器、チョークコイル及びタップ切換器用の除湿機 |
US10/547,719 US7563310B2 (en) | 2003-04-04 | 2004-04-01 | Air dehumidifier for oil-insulated transformers, choke coils and steps switches |
EP04724993A EP1611587B1 (de) | 2003-04-04 | 2004-04-01 | Luftentfeuchter fur ölisolierte transformatoren, drosselspulen sowie stufenschalter |
CN2004800061372A CN1757081B (zh) | 2003-04-04 | 2004-04-01 | 用于油绝缘的变压器、扼流圈或分接开关的空气干燥器 |
KR1020057015198A KR101089109B1 (ko) | 2003-04-04 | 2004-04-01 | 오일-단열된 변압기, 초크 코일 및 스텝 스위치용 공기제습기 |
DE502004000963T DE502004000963D1 (de) | 2003-04-04 | 2004-04-01 | Luftentfeuchter fur ölisolierte transformatoren, drosselspulen sowie stufenschalter |
CA2520989A CA2520989C (en) | 2003-04-04 | 2004-04-01 | Dehumidifier for oil-insulated transformer, choke coil, and tap changer |
HK06107561A HK1091026A1 (en) | 2003-04-04 | 2006-07-04 | Air de-humidifier for oil-insulated transformers, choke coils and step switches |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10315719A DE10315719B3 (de) | 2003-04-04 | 2003-04-04 | Luftentfeuchter für ölisolierte Transformatoren, Drosselspulen sowie Stufenschalter |
DE10315719.0 | 2003-04-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004088679A2 true WO2004088679A2 (de) | 2004-10-14 |
WO2004088679A3 WO2004088679A3 (de) | 2004-12-09 |
Family
ID=33103232
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/003448 WO2004088679A2 (de) | 2003-04-04 | 2004-04-01 | Luftentfeuchter für ölisolierte transformatoren, drosselspulen sowie stufenschalter |
Country Status (10)
Country | Link |
---|---|
US (1) | US7563310B2 (de) |
EP (1) | EP1611587B1 (de) |
JP (1) | JP4382807B2 (de) |
KR (1) | KR101089109B1 (de) |
CN (1) | CN1757081B (de) |
AT (1) | ATE333139T1 (de) |
CA (1) | CA2520989C (de) |
DE (2) | DE10315719B3 (de) |
HK (1) | HK1091026A1 (de) |
WO (1) | WO2004088679A2 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006069360A3 (en) * | 2004-12-23 | 2006-08-24 | Waukesha Electric Systems Inc | Dehydrating breather apparatus and method |
WO2009019733A1 (en) * | 2007-08-07 | 2009-02-12 | Comem S.P.A. | Improved drier for dehumidifying the air intended for oil expansion tank used in electrical equipments |
JP2009528156A (ja) * | 2006-03-02 | 2009-08-06 | マシイネンフアブリーク・ラインハウゼン・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | 除湿装置の乾燥方法 |
USRE42058E1 (en) * | 2002-09-06 | 2011-01-25 | Waukesha Electric Systems, Inc. | Automatic dehydrating breather apparatus and method |
EP2514511A1 (de) * | 2011-04-20 | 2012-10-24 | ABB Technology AG | Luftdehydrierende Entlüftungseinrichtung zur Bereitstellung von entfeuchteter Luft für Elektrogeräte und zugehöriges Verfahren |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004016583B3 (de) * | 2004-03-31 | 2006-03-09 | Siemens Ag | Mehrkammersystem als Flüssigkeitsausgleichsgefäß und deren Verwendung |
ATE492893T1 (de) * | 2008-04-28 | 2011-01-15 | Abb Technology Ltd | Verfahren und vorrichtung zur bestimmung der relativen feuchtigkeit eines mit isolierender flüssigkeit gefüllten elektrischen gerätes |
EP2377597B1 (de) * | 2009-01-14 | 2018-05-30 | Nabtesco Automotive Corporation | Ölunterdrückungsstruktur in einer lufttrocknungsvorrichtung |
CN102290199B (zh) * | 2011-05-09 | 2013-01-16 | 华东理工大学 | 多通道可切换电加热干燥器 |
JP5925443B2 (ja) * | 2011-08-02 | 2016-05-25 | 株式会社東芝 | 静止誘導電気機器およびその製造方法 |
JP5831706B2 (ja) * | 2012-03-13 | 2015-12-09 | 東京電力株式会社 | 調湿剤を用いた開閉機器用のブリーザー及び調湿剤面積の決定方法 |
US9114353B2 (en) | 2012-12-18 | 2015-08-25 | Waukesha Electric Systems, Inc. | Dehumidifier and breather configured for operation during regeneration |
CN110491642B (zh) * | 2019-07-25 | 2021-12-10 | 国网冀北电力有限公司承德供电公司 | 一种低损耗高阻抗电力变压器 |
EP3789103B1 (de) * | 2019-09-04 | 2022-04-13 | COMEM S.p.A. | Entlüftervorrichtung zur trocknung von luft welche in einen entspannungsbehälter einer elektrische leistungseinrichtung gespeist wird |
WO2022015208A1 (ru) * | 2020-07-14 | 2022-01-20 | Евгений Анатольевич ПРОСКУРИН | Воздухоосушитель |
RU2743877C1 (ru) * | 2020-08-11 | 2021-03-01 | Григорий Соломонович Марголин | Способ установки голосового протеза в отверстие в трахеопищеводной стенке в трахеостоме после удаления гортани человека и устройство для его реализации |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB229833A (en) * | 1924-01-24 | 1925-03-05 | Alfred William George Tucker | Improvements relating to oil-immersed electric transformers |
GB1225673A (de) * | 1968-03-27 | 1971-03-17 | ||
DE2257615A1 (de) * | 1972-11-24 | 1974-05-30 | Kurt Jaczak | Apparat zum trocknen und reinigen von transformatoren-oelen |
DE3413071A1 (de) * | 1984-04-06 | 1985-10-17 | Transformatoren Union Ag, 7000 Stuttgart | Luftentfeuchter fuer transformatoren |
DE3413888A1 (de) * | 1984-04-12 | 1985-10-17 | Transformatoren Union Ag, 7000 Stuttgart | Luftentfeuchter fuer transformatoren |
EP0481239A1 (de) * | 1990-10-19 | 1992-04-22 | Maschinenfabrik Reinhausen Gmbh | Ölfilter, insbesondere für Stufenschalter von Stufentransformatoren |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6076013U (ja) * | 1983-10-31 | 1985-05-28 | 株式会社東芝 | 油入電器の吸湿呼吸装置 |
JPS60198710A (ja) * | 1984-03-23 | 1985-10-08 | Toshiba Corp | 油入電器の吸湿呼吸装置 |
CN87208681U (zh) * | 1987-05-26 | 1988-08-10 | 云南省电子工业局试验研究所 | 高压充油设备防潮装置 |
US4942364A (en) * | 1988-02-19 | 1990-07-17 | Asahi Kasei Kogyo Kabushiki Kaisha | Moisture and dew-detection sensor |
US5337599A (en) * | 1990-04-20 | 1994-08-16 | Alcor, Inc. | Apparatus and method for determining the thermal stability of fluids |
JPH10135043A (ja) * | 1996-10-30 | 1998-05-22 | Nippon Koei Co Ltd | 吸湿呼吸器における吸湿剤の取出装置およびその取出装置を有する吸湿呼吸器 |
US5902381A (en) | 1997-05-30 | 1999-05-11 | General Signal Corporation | Dehydrating breather apparatus |
ES2214462T3 (es) * | 2001-11-13 | 2004-09-16 | Maschinenfabrik Reinhausen Gmbh | Deshumedecedor de aire para transformadores aislados por aceite, bobinas de reactancia, asi como interruptores escalonados. |
DE10357085B3 (de) * | 2003-12-06 | 2005-03-17 | Maschinenfabrik Reinhausen Gmbh | Verfahren zur Luftentfeuchtung und Luftentfeuchter für ölisolierte Transformatoren, Drosselspulen sowie Stufenschalter |
-
2003
- 2003-04-04 DE DE10315719A patent/DE10315719B3/de not_active Expired - Fee Related
-
2004
- 2004-04-01 CA CA2520989A patent/CA2520989C/en not_active Expired - Fee Related
- 2004-04-01 KR KR1020057015198A patent/KR101089109B1/ko not_active IP Right Cessation
- 2004-04-01 US US10/547,719 patent/US7563310B2/en not_active Expired - Fee Related
- 2004-04-01 CN CN2004800061372A patent/CN1757081B/zh not_active Expired - Fee Related
- 2004-04-01 WO PCT/EP2004/003448 patent/WO2004088679A2/de active IP Right Grant
- 2004-04-01 EP EP04724993A patent/EP1611587B1/de not_active Expired - Lifetime
- 2004-04-01 AT AT04724993T patent/ATE333139T1/de not_active IP Right Cessation
- 2004-04-01 DE DE502004000963T patent/DE502004000963D1/de not_active Expired - Lifetime
- 2004-04-01 JP JP2006504945A patent/JP4382807B2/ja not_active Expired - Fee Related
-
2006
- 2006-07-04 HK HK06107561A patent/HK1091026A1/xx not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB229833A (en) * | 1924-01-24 | 1925-03-05 | Alfred William George Tucker | Improvements relating to oil-immersed electric transformers |
GB1225673A (de) * | 1968-03-27 | 1971-03-17 | ||
DE2257615A1 (de) * | 1972-11-24 | 1974-05-30 | Kurt Jaczak | Apparat zum trocknen und reinigen von transformatoren-oelen |
DE3413071A1 (de) * | 1984-04-06 | 1985-10-17 | Transformatoren Union Ag, 7000 Stuttgart | Luftentfeuchter fuer transformatoren |
DE3413888A1 (de) * | 1984-04-12 | 1985-10-17 | Transformatoren Union Ag, 7000 Stuttgart | Luftentfeuchter fuer transformatoren |
EP0481239A1 (de) * | 1990-10-19 | 1992-04-22 | Maschinenfabrik Reinhausen Gmbh | Ölfilter, insbesondere für Stufenschalter von Stufentransformatoren |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7332015B2 (en) | 2002-09-06 | 2008-02-19 | Waukesha Electric Systems, Inc | Automatic dehydrating breather apparatus and method |
USRE42058E1 (en) * | 2002-09-06 | 2011-01-25 | Waukesha Electric Systems, Inc. | Automatic dehydrating breather apparatus and method |
WO2006069360A3 (en) * | 2004-12-23 | 2006-08-24 | Waukesha Electric Systems Inc | Dehydrating breather apparatus and method |
JP2009528156A (ja) * | 2006-03-02 | 2009-08-06 | マシイネンフアブリーク・ラインハウゼン・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | 除湿装置の乾燥方法 |
WO2009019733A1 (en) * | 2007-08-07 | 2009-02-12 | Comem S.P.A. | Improved drier for dehumidifying the air intended for oil expansion tank used in electrical equipments |
EP2514511A1 (de) * | 2011-04-20 | 2012-10-24 | ABB Technology AG | Luftdehydrierende Entlüftungseinrichtung zur Bereitstellung von entfeuchteter Luft für Elektrogeräte und zugehöriges Verfahren |
WO2012143285A1 (en) * | 2011-04-20 | 2012-10-26 | Abb Technology Ag | Air dehydrating breather assembly for providing dehumidified air to electrical devices, and related method |
US9108149B2 (en) | 2011-04-20 | 2015-08-18 | Abb Technology Ag | Air dehydrating breather assembly for providing dehumidified air to electrical devices, and related method |
Also Published As
Publication number | Publication date |
---|---|
DE502004000963D1 (de) | 2006-08-24 |
ATE333139T1 (de) | 2006-08-15 |
CA2520989A1 (en) | 2004-10-14 |
WO2004088679A3 (de) | 2004-12-09 |
EP1611587B1 (de) | 2006-07-12 |
HK1091026A1 (en) | 2007-01-05 |
JP2006522471A (ja) | 2006-09-28 |
CA2520989C (en) | 2013-01-22 |
CN1757081B (zh) | 2011-04-13 |
DE10315719B3 (de) | 2004-12-23 |
CN1757081A (zh) | 2006-04-05 |
US20060162304A1 (en) | 2006-07-27 |
JP4382807B2 (ja) | 2009-12-16 |
EP1611587A2 (de) | 2006-01-04 |
KR20050113183A (ko) | 2005-12-01 |
US7563310B2 (en) | 2009-07-21 |
KR101089109B1 (ko) | 2011-12-06 |
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