EP2541156A1 - Gas boiler having a hybrid open-and-closed-type expansion tank - Google Patents

Gas boiler having a hybrid open-and-closed-type expansion tank Download PDF

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Publication number
EP2541156A1
EP2541156A1 EP10846704A EP10846704A EP2541156A1 EP 2541156 A1 EP2541156 A1 EP 2541156A1 EP 10846704 A EP10846704 A EP 10846704A EP 10846704 A EP10846704 A EP 10846704A EP 2541156 A1 EP2541156 A1 EP 2541156A1
Authority
EP
European Patent Office
Prior art keywords
expansion tank
water
heating water
gas boiler
water level
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.)
Withdrawn
Application number
EP10846704A
Other languages
German (de)
English (en)
French (fr)
Inventor
Tae-Sik Min
Jeong-Seon Heo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyungdong Navien Co Ltd
Original Assignee
Kyungdong Navien Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kyungdong Navien Co Ltd filed Critical Kyungdong Navien Co Ltd
Publication of EP2541156A1 publication Critical patent/EP2541156A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1008—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system expansion tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1008—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system expansion tanks
    • F24D3/1041—Flow-through

Definitions

  • the present invention relates to a gas boiler having a hybrid open-and-closed type expansion tank, and more particularly, to a gas boiler having a hybrid open-and-closed type expansion tank that can be controlled to adopt an open configuration when the boiler is refilled with water so as to enable smooth water refilling regardless of the water pressure of a tap, and can be controlled to switch into a closed configuration when the boiler operates after the water refilling so as to maintain the pressure within the expansion tank at a level suitable for smooth flows of heating water and stable operations of the gas boiler.
  • gas boilers include an open type gas boiler opened to the atmosphere and a closed type gas boiler closed to the atmosphere.
  • FIG. 1 is a schematic view illustrating an open type gas boiler of the related art.
  • the open type gas boiler is opened to the atmosphere and includes: an circulation pump 10 to circulate heating water; a main heat exchanger 20 to which heating water is pumped by the circulation pump 10 so as to heat the heating water with a burner 21; a three-way valve 30 configured to supply heating water to a heating pipe line (a place to be heated) in heating mode and to a hot water heat exchanger 40 in hot water supply mode; the hot water heat exchanger 40 configured to supply hot water by heating tap water in hot water supply mode; and an expansion tank 50 in which circulated heating water is stored and capable of absorbing pressure variations caused by temperature variations of heating water.
  • Reference numeral 61 denotes a heating water supply pipe
  • reference numeral 62 denotes heating water return pipe
  • reference numeral 63 denotes a tap water pipe
  • reference numeral 64 denotes a hot water pipe.
  • a water level sensor 51 is disposed in the expansion tank 50 to detect whether the level of heating water in the expansion tank 50 is within a predetermined water level range, and an overflow pipe 52 is provided so that the heating water can flow to the outside through the overflow pipe 52 if the level of the heating water exceeds a predetermined level.
  • the heating water is opened to the atmosphere through the overflow pipe 52.
  • the open type gas boiler has a simple structure and is inexpensive. However, since a heating water circulation system is opened to the atmosphere, the open type gas boiler cannot be disposed at a position lower than the heating pipe line (a place to be heated). That is, the installation position of the open type gas boiler is limited. In addition, since oxygen can be introduced into heating water, the heating pipe line may corrode.
  • FIG. 2 is a schematic view illustrating a closed type gas boiler of the related art.
  • the closed type gas boiler Like the open type gas boiler, the closed type gas boiler includes a circulation pump 10, a main heat exchanger 20, a burner 21, a three-way valve 30, and a hot water heat exchanger 40. However, the closed type gas boiler includes an expansion tank 70 not opened to the atmosphere, a gas-liquid separator 71, an overpressure safety valve 72, and a pressure gauge 73.
  • the expansion tank 70 is not opened to the atmosphere, and a rubber plate 70a is disposed in the expansion tank 70.
  • the inside of the expansion tank 70 is divided by the rubber plate 70a into a gas storing part 70b in which gas (for example, nitrogen) is filled and a heating water storing part 70c in which heating water is filled.
  • the rubber plate 70a can be deformed according to pressure, and thus pressure variations of heating water can be absorbed by the rubber plate 70a.
  • the installation position of the closed type gas boiler is not limited, and heating water is not exposed to oxygen because a heating water circulation system is closed to the atmosphere.
  • the closed type gas boiler has a complex structure and is expensive.
  • the closed type gas boiler requires the gas-liquid separator but it is difficult to remove bubbles from piping.
  • the pressure of tap water should be adjusted according to the difference between the pressure of the tap water and the inside pressure of the expansion tank because the expansion tank and heating water pipes of the closed type gas boiler are not opened to the atmosphere, and thus it is difficult to supply water smoothly and quickly.
  • the inside pressure of the expansion tank of the closed type gas boiler is excessively increased, the heating water pipes may be damaged, and the operation of the closed type gas boiler may become unstable.
  • Exemplary embodiments of the present invention provide a gas boiler having a hybrid open-and-closed type expansion tank that can be smoothly refilled with water regardless of the pressure of tap water.
  • exemplary embodiments of the present invention provide a gas boiler having a hybrid open-and-closed type expansion tank configured to prevent an excessive pressure increase caused by volumetric expansion of heating water in the expansion tank while the gas boiler operates, thereby ensuring stable operations of the gas boiler.
  • Embodiments of the present invention provide a gas boiler having a hybrid open-and-closed type expansion tank in which circulated heating water is contained and capable of absorbing pressure variations of the heating water, the gas boiler including: a water level sensor configured to detect whether the heating water contained in the expansion tank is within a preset water level range; an air vent disposed at a side of the expansion tank, an air outlet of the air vent opened to the atmosphere being opened or closed according to variations of a water level in the expansion tank; and an overpressure safety valve disposed at an upper side of the expansion tank to maintain an inside pressure of the expansion tank at a predetermined value or lower.
  • the gas boiler may further includes: a heating water refilling part provided at a heating water passage of the gas boiler; and a control unit configured to control refilling of heating water through the heating water refilling part according to a level of the heating water detected by the water level sensor.
  • the water level sensor may include a short conductor and a long conductor that extend downward from an upper side of the expansion tank so as to regulate upper and lower water level limits of the heating water contained in the expansion tank, and during heating water refilling, the control unit may control the heating water refilling part so that heating water can be supplied through the heating water refilling part until the heating water is detected by a lower end of the long conductor of the water level sensor.
  • connection pipe connecting the air vent and the expansion tank may be positioned at a height immediately above the lower end of the long conductor of the water level sensor.
  • the air outlet of the air vent may be positioned in height between lower ends of the short and long conductors of the water level sensor.
  • the expansion tank is opened to the atmosphere through the air outlet of the air vent so that the water refilling can be smoothly carried out regardless of the pressure of tap water to be supplied.
  • the gas boiler when the gas boiler is operated after the gas boiler is refilled with water, since the air outlet of the air vent is closed and thus the expansion tank is closed to the atmosphere, contact between heating water and air can be prevented to protect heating water pipes from corrosion.
  • the inside pressure of the expansion tank is maintained at a proper level by the overpressure safety valve disposed at an upper side of the expansion tank, heating water can be smoothly flow through a heating water passage, and the gas boiler can be stably operated.
  • FIG. 1 is a schematic view illustrating an open type gas boiler of the related art.
  • FIG. 2 is a schematic view illustrating a closed type gas boiler of the related art.
  • FIG. 3 is a schematic view illustrating a gas boiler including a hybrid open-and-closed expansion tank according to an embodiment of the present invention.
  • FIG. 4 is a view illustrating the expansion tank of the gas boiler when the expansion tank is refilled with water according to an embodiment of the present invention, in which (a) illustrates a state immediately after the water refilling, and (b) illustrates a state after a certain period of time from the end of the water refilling.
  • FIG. 5 is view illustrating the expansion tank after the gas boiler starts to operate according to an embodiment of the present invention.
  • FIG. 6 is a view illustrating the expansion tank of the gas boiler when the expansion tank absorbs a volumetric expansion caused by a temperature increase of heating water.
  • FIG. 7 is view illustrating the expansion tank of the gas boiler when the inside air pressure of the expansion tank is excessively high and compressed air is discharged from the expansion tank through an overpressure safety valve.
  • circulation pump 20 main heat exchanger 21: burner 30: three-way valve 40:hot water heat exchanger 50, 70, 100: expansion tank 51, 110: water level sensor 52: overflow pipe 61: heating water supply pipe 62: heating water return pipe 63: tap water pipe 64: hot water pipe 71: gas-liquid separator 72, 130: overpressure safety valve 73: pressure gauge 110a: short conductor 110b: long conductor 120: air vent 121: connection pipe 122: air vent body 123: float 124: air outlet plug 125: air outlet 140: heating water refilling part 141: water refilling valve 142: refilling water supply pipe
  • FIG. 3 is a schematic view illustrating a gas boiler including a hybrid open-and-closed expansion tank according to an embodiment of the present invention.
  • the gas boiler of the present invention includes: an circulation pump 10 to circulate heating water; a main heat exchanger 20 to which heating water is pumped by the circulation pump 10 so as to heat the heating water with a burner 21; a three-way valve 30 configured to supply heating water to a heating pipe line (a place to be heated) in heating mode and to a hot water heat exchanger 40 in hot water supply mode; the hot water heat exchanger 40 configured to supply hot water by heating tap water in hot water supply mode; a heating water supply pipe 61; a heating water return pipe 62; a tap water pipe 63; and a hot water pipe 64.
  • the present invention is characterized in that a water level sensor 110, an air vent 120, and an overpressure safety valve 130 are disposed at the expansion tank 100, and a heating water refilling part 140 is provided on a heating water passage.
  • the heating water refilling part 140 includes a water refilling valve 141 disposed on the tap water pipe 63, and a refilling water supply pipe 142 connecting the water refilling valve 141 and the heating water return pipe 62.
  • the water level sensor 110 detects the level of heating water contained in the expansion tank 100.
  • the water level sensor 110 includes a short conductor 110a and a long conductor 110b that extend downward from an upper side of the expansion tank 100 for regulating upper and lower water level limits of heating water in the expansion tank 100. If the short conductor 110a or the long conductor 110b makes contact with heating water, an electric signal is transmitted to a control unit (not shown), and the control unit controls the water refilling valve 141 according to the electric signal so as to regulate the amount of heating water in the gas boiler.
  • the air vent 120 communicates with a connection pipe 121 disposed at a side of the expansion tank 100.
  • An air outlet 125 of the air vent 120 opened to the atmosphere is opened or closed according to the level of heating water in the expansion tank 100 so that the expansion tank 100 can be opened to the atmosphere when being refilled with water and be switched to be closed to the atmosphere when the gas boiler operates after the water refilling.
  • the air vent 120 includes: an air vent body 122 communicating with the connection pipe 121; a float 123 floating on introduced heating water; an air outlet plug 124 coupled to the topside of the float 123; and the air outlet 125 formed in an upper portion of the air vent body 122 for discharging air to the outside.
  • connection pipe 121 is connected to a position immediately above a lower end 110b-1 of the long conductor 110b of the water level sensor 110 for smooth water refilling.
  • the air outlet 125 of the air vent 120 is positioned in height between a lower end 110a-1 of the short conductor 110a and the lower end 110b-1 of the long conductor 110b of the water level sensor 110 so that when the gas boiler operates, the expansion tank 100 can be switched from a state where the expansion tank 100 is opened to the atmosphere to a state where the expansion tank 100 is closed to the atmosphere.
  • the overpressure safety valve 130 is disposed on an upper side of the expansion tank 100 to prevent the inside air pressure of the expansion tank 100 from increasing to a value greater than an allowable value.
  • the overpressure safety valve 130 is configured by a check valve that allows air to flow out of the expansion tank 100 when the inside air pressure increases but does not allow air to flow into the expansion tank 100.
  • FIG. 4 is a view illustrating the expansion tank of the gas boiler when the expansion tank is refilled with water according to an embodiment of the present invention, in which (a) illustrates a state immediately after the water refilling, and (b) illustrates a state after a certain period of time from the end of the water refilling.
  • the water level sensor 110 When the gas boiler is first filled with water or if the level of heating water filled in the expansion tank 100 decreases below the lower end 110b-1 of the long conductor 110b of the water level sensor 110 while the gas boiler operates and thus the amount of heating water in the gas boiler is insufficient, the water level sensor 110 generates a signal to the control unit, and then the control unit stops the operation of the gas boiler and opens the water refilling valve 141 to refill the expansion tank 100 with water.
  • the level of heating water in the expansion tank 100 gradually increases and makes contact with the lower end 110b-1 of the long conductor 110b of the water level sensor 110 as shown in FIG. 4(a) , and then the gas boiler gets ready to operate. This state is detected by the water level sensor 110, and the water level sensor 110 generates a detection signal to the control unit. Then, the water refilling valve 141 is closed under the control of the control unit to stop the water refilling.
  • the gas boiler When the gas boiler is refilled with water as described above, since the inside air of the expansion tank 100 is opened to the atmosphere through the connection pipe 121 and the air outlet 125 of the air vent 120, the inside pressure of the expansion tank 100 is equal to atmospheric pressure, and thus the gas boiler can be smoothly refilled with water regardless of the pressure of tap water.
  • the level of heating water in the expansion tank 100 has increased a little as shown in FIG. 4(b) due to a time necessary for water to flow from the water refilling valve 141 to the expansion tank 100.
  • the expansion tank 100 is closed to the atmosphere. That is, when water refilling is finished and the gas boiler gets ready to operate, the expansion tank 100 is switched from an open state to a closed state.
  • the inside air pressure of the expansion tank 100 is slightly higher than atmospheric pressure, and thus when the gas boiler operates, the heating water may smoothly flow along the heating water passage.
  • the gas boiler can be disposed at any position such as a position lower than the heating pipe line, and the heating pipe may not corrode because heating water is not opened to the atmosphere.
  • FIG. 5 is view illustrating the expansion tank after the gas boiler starts to operate according to an embodiment of the present invention
  • FIG. 6 is a view illustrating the expansion tank of the gas boiler when the expansion tank absorbs a volumetric expansion caused by a temperature increase of heating water.
  • the level of heating water in the expansion tank 100 ranges between the lower end 110a-1 of the short conductor 110a and the lower end 110b-1 of the long conductor 110b of the water level sensor 110 as shown in FIG. 5 .
  • the temperature and volume of heating water gradually increase because the heating water is heated by the burner while circulating along the heating water passage, and thus the level of the heating water increases in the expansion tank 100 as shown in FIG. 6 .
  • the level of the heating water becomes higher than the lower end 110a-1 of the short conductor 110a of the water level sensor 110, air filled in the expansion tank 100 is compressed to absorb the volumetric expansion of the heating water.
  • FIG. 7 is view illustrating the expansion tank of the gas boiler when the inside air pressure of the expansion tank is excessively high and compressed air is discharged from the expansion tank through the overpressure safety valve.
  • the overpressure safety valve 130 is opened by the pressure of compressed air so that the inside air pressure of the expansion tank 100 can be automatically decreased to a predetermined value or lower. Therefore, piping of the gas boiler may not be damaged by an excessive inside pressure of the expansion tank 100, and the gas boiler can be operated under stable pressure conditions as compared with gas boilers of the related art.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
EP10846704A 2010-02-25 2010-11-11 Gas boiler having a hybrid open-and-closed-type expansion tank Withdrawn EP2541156A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020100016923A KR101155707B1 (ko) 2010-02-25 2010-02-25 개방형과 밀폐형이 혼합된 팽창탱크를 구비한 가스보일러
PCT/KR2010/007971 WO2011105677A1 (ko) 2010-02-25 2010-11-11 개방형과 밀폐형이 혼합된 팽창탱크를 구비한 가스보일러

Publications (1)

Publication Number Publication Date
EP2541156A1 true EP2541156A1 (en) 2013-01-02

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ID=44507059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10846704A Withdrawn EP2541156A1 (en) 2010-02-25 2010-11-11 Gas boiler having a hybrid open-and-closed-type expansion tank

Country Status (4)

Country Link
EP (1) EP2541156A1 (ko)
KR (1) KR101155707B1 (ko)
CN (1) CN102822605B (ko)
WO (1) WO2011105677A1 (ko)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2567226C2 (ru) * 2014-02-20 2015-11-10 Государственное бюджетное образовательное учреждение высшего профессионального образования Нижегородский государственный инженерно-экономический институт (ГБОУ ВПО НГИЭИ) Автоматизированный тепловой пункт
JP2017133748A (ja) * 2016-01-27 2017-08-03 大阪瓦斯株式会社 排熱利用熱源設備
RU2778000C1 (ru) * 2021-07-08 2022-08-12 федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный технический университет" Способ работы закрытой системы теплоснабжения

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KR101369158B1 (ko) * 2012-07-23 2014-03-04 린나이코리아 주식회사 압력계 지시값을 이용한 밀폐형 보일러의 물 보충장치
JP6886640B2 (ja) * 2017-10-26 2021-06-16 株式会社ノーリツ 温水暖房システム
KR102657762B1 (ko) * 2022-06-03 2024-04-15 이진성 전기 보일러

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JP3702055B2 (ja) 1996-11-14 2005-10-05 三洋電機株式会社 温水暖房装置の熱源機
CN2438052Y (zh) * 2000-09-08 2001-07-04 广东万家乐燃气具有限公司 分体式热水采暖装置
KR100681339B1 (ko) * 2004-12-23 2007-02-15 최성환 연탄보일러
KR20080050651A (ko) * 2006-12-04 2008-06-10 주식회사 경동나비엔 저압 대기밀폐형 보일러 및 그 제어방법
KR100890116B1 (ko) * 2007-09-20 2009-03-24 이동호 상향식 보일러
KR100951152B1 (ko) * 2008-02-29 2010-04-06 주식회사 경동나비엔 밀폐형 팽창탱크를 구비한 가스보일러

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2567226C2 (ru) * 2014-02-20 2015-11-10 Государственное бюджетное образовательное учреждение высшего профессионального образования Нижегородский государственный инженерно-экономический институт (ГБОУ ВПО НГИЭИ) Автоматизированный тепловой пункт
JP2017133748A (ja) * 2016-01-27 2017-08-03 大阪瓦斯株式会社 排熱利用熱源設備
RU2778000C1 (ru) * 2021-07-08 2022-08-12 федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный технический университет" Способ работы закрытой системы теплоснабжения

Also Published As

Publication number Publication date
WO2011105677A1 (ko) 2011-09-01
CN102822605A (zh) 2012-12-12
KR20110097206A (ko) 2011-08-31
KR101155707B1 (ko) 2012-06-14
CN102822605B (zh) 2014-12-31

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