US20150056563A1 - Dual venturi for combustor - Google Patents

Dual venturi for combustor Download PDF

Info

Publication number
US20150056563A1
US20150056563A1 US14/378,966 US201314378966A US2015056563A1 US 20150056563 A1 US20150056563 A1 US 20150056563A1 US 201314378966 A US201314378966 A US 201314378966A US 2015056563 A1 US2015056563 A1 US 2015056563A1
Authority
US
United States
Prior art keywords
moving body
gas
motor
valve body
cam
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.)
Abandoned
Application number
US14/378,966
Other languages
English (en)
Inventor
Kyeong Joo Kim
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
Assigned to KYUNGDONG NAVIEN CO., LTD. reassignment KYUNGDONG NAVIEN CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, Kyeong Joo
Publication of US20150056563A1 publication Critical patent/US20150056563A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/70—Baffles or like flow-disturbing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/24—Valve details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/10—High or low fire

Definitions

  • the present invention relates to a dual venturi for a combustion apparatus, and more particularly, to a dual venturi for a combustion apparatus, capable of effectively controlling a heating value since respective amounts of gas and air supplied to a burner provided in a water heater are controlled in a two-step manner and a motor is coupled to a damper so that the damper simultaneously opens or closes inlets for secondary air and gas along with rotation of the damper by driving of the motor.
  • combustion apparatuses such as boilers and water heaters for the purpose of use of heating and hot water are classified into an oil boiler, a gas boiler, an electric boiler and a water heater depending on the fuel it is supplied with, and are variously developed and used according to installation applications.
  • the gas boiler and the water heater typically use a bunsen burner or a premixed burner to burn gas fuel.
  • the premixed burner among others has a combustion method of mixing gas and air in a mixing ratio for optimal combustion and then supplying a mixture (air+gas) to a flame hole section so that the mixture is burned.
  • the performance of the combustion apparatuses is evaluated as a TDR (Turn-Down Ratio).
  • the TDR refers to “a ratio of maximum gas consumption to minimum gas consumption” in a gas combustion device in which an amount of gas is variably controlled. For example, when the maximum gas consumption is 24,000 kcal/h and the minimum gas consumption is 8,000 kcal/h, the TDR is 3:1.
  • the TDR is constrained by whether flame is stably maintained to some degree under minimum gas consumption.
  • valves allowing for supply of gas are mainly classified into an electrical modulating gas valve controlled by current values and a pneumatic modulating gas valve controlled by differential pressures generated during supply of air.
  • the pneumatic modulating gas valve controls an amount of gas supplied to the burner by differential pressures generated when air required for combustion is supplied to the burner by a blower.
  • air and gas required for combustion are mixed in a gas-air mixer and then supplied to the burner in a mixture (air+gas) form.
  • the TDR is basically constrained by a factor such as a relation between gas consumption Q and differential pressure ⁇ P.
  • the relation between flow rate and differential pressure of a fluid is generally as follows.
  • the ratio of pressure differences has to be defined as 9:1 for defining the TDR as 3:1 and the ratio of pressure differences has to be defined as 100:1 for defining the TDR as 10:1.
  • the ratio of pressure differences has to be defined as 9:1 for defining the TDR as 3:1 and the ratio of pressure differences has to be defined as 100:1 for defining the TDR as 10:1.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide a dual venturi for a combustion apparatus, capable of achieving high operation durability, easy manufacturing, and a reduction in manufacturing cost while the dual venturi is compact by simplification of a complicated structure.
  • a dual venturi for a combustion apparatus includes a housing having a first gas inlet and second gas inlet formed at one side of an upper portion thereof and divided therein by a partition wall to have a first passage and a second passage, and an opening and closing unit provided within the housing, connected to the second gas inlet at an upper portion thereof such that gas is introduced into the opening and closing unit, and controlling flows of air and gas by closing or opening the second passage along with rotation of a damper by a motor provided at an outer side of the housing.
  • the opening and closing unit may include a tubular guide tube having one or more concave guides formed on an inner wall thereof, a tubular moving body having convex guides formed on an outer wall thereof to correspond to the concave guides so that the moving body moves within the guide tube in a longitudinal direction of the guide tube, a gas outlet formed at a distal end thereof to communicate with the second gas inlet, and a moving body cam having a cam shape formed on an outer surface thereof, a valve body having the damper formed on an outer surface thereof, a gas outlet formed at a side of the damper, and a valve body cam formed at an inner side thereof in a shape corresponding to the moving body cam such that the valve body cam engages with the moving body cam, valve body being coupled to the motor, a spring provided within the moving body to elastically support the moving body, and a cap supporting the spring and coupled to an upper portion of the guide tube.
  • valve body may further include a sealing member for sealing an inner lower end thereof.
  • the motor may be a synchronous motor.
  • heating values such as low heating values or high heating values may be selectively generated by a water heater as necessary and a user may control the heating values such as low heating values or high heating values as necessary. Therefore, fuel costs may be reduced.
  • an inner portion of a housing is divided by a partition wall to form a first passage and a second passage so that only primary air and gas flow in the first passage and only secondary air and gas flow in the second passage. Therefore, it may be possible to easily adjust a TDR by regulating the flows of air and gas in the second passage.
  • a structure may be significantly simplified.
  • FIG. 1A is a perspective view illustrating a dual venturi for a combustion apparatus according to an embodiment of the present invention.
  • FIG. 1B is a cross-sectional view taken along line A-A of FIG. 1A .
  • FIG. 2A is a cross-sectional view taken along line B-B of FIG. 1A .
  • FIG. 2B is a view illustrating a state in which a moving body is moved upward in FIG. 2A .
  • FIGS. 3A and 3B are perspective views illustrating the moving body of FIG. 1B .
  • FIG. 4 is a perspective view illustrating a valve body of FIG. 1B .
  • FIGS. 5A and 5B are perspective views illustrating an opening and closing unit.
  • FIG. 6 is a cross-sectional view taken along line C-C of FIG. 5A .
  • FIG. 7 is a view illustrating a position relation between a motor and a limited switch of the motor included in the dual venturi for a combustion apparatus according to the embodiment of the present invention.
  • FIG. 1A is a perspective view illustrating a dual venturi for a combustion apparatus according to an embodiment of the present invention.
  • FIG. 1B is a cross-sectional view taken along line A-A of FIG. 1A .
  • FIG. 2A is a cross-sectional view taken along line B-B of FIG. 1A .
  • FIG. 2B is a view illustrating a state in which a moving body is moved upward in FIG. 2A .
  • FIGS. 3A and 3B are perspective views illustrating the moving body of FIG. 1B .
  • FIG. 4 is a perspective view illustrating a valve body of FIG. 1B .
  • FIGS. 5A and 5B are perspective views illustrating an opening and closing unit.
  • FIG. 6 is a cross-sectional view taken along line C-C of FIG. 5A .
  • FIG. 7 is a view illustrating a position relation between a motor and a limited switch of the motor included in the dual venturi for a combustion apparatus according to the embodiment of the
  • the dual venturi for a combustion apparatus includes a cylindrical housing 10 which has a first gas inlet 14 and second gas inlet 15 formed at one side of an upper portion thereof and is divided therein by a partition wall 13 to have a first passage 11 and a second passage 12 .
  • a discharge port 16 formed at the housing 10 is coupled with a turbofan (not shown) for supplying a mixture (gas+air) introduced from the first and second passages 11 and 12 to a burner.
  • the housing 10 is coupled, at an inner central portion thereof, with an opening and closing unit 100 which is connected to the second gas inlet 15 at an upper portion thereof such that gas is introduced into the opening and closing unit 100 and controls the flows of air and gas by closing or opening the second passage 12 along with rotation of a damper 142 by a motor 180 provided at an outer side of the housing 10 .
  • the motor 180 is preferably configured of a synchronous motor. This enables manufacturing costs to be reduced by generally using the cheap synchronous motor.
  • the opening and closing unit 100 includes a tubular guide tube 130 having one or more concave guides 131 formed on an inner wall thereof, and a tubular moving body 120 which has convex guides 122 formed on an outer wall thereof to correspond to the concave guides 131 so that the moving body 120 moves within the guide tube 130 in a longitudinal direction of the guide tube 130 , a gas outlet 123 formed at a distal end thereof to communicate with the second gas inlet 15 , and a moving body cam 121 having a cam shape formed on an outer surface thereof.
  • An inner surface of the guide tube 130 and an outer surface of the moving body 120 are formed in a stepped shape, and a sealing ring 146 is coupled to the stepped portion to prevent leakage of gas.
  • the opening and closing unit 100 includes a valve body 140 which is coupled to a lower portion of the moving body 120 , has the damper 142 formed on an outer surface thereof, a gas outlet 143 formed at a side of the damper 142 , and a valve body cam 141 formed at an inner side thereof in a shape corresponding to the moving body cam 121 such that the valve body cam 141 engages with the moving body cam 121 , and is coupled to the motor 180 .
  • the opening and closing unit 100 includes a spring 160 formed inside the moving body 120 to elastically support the moving body 120 and a cap 170 which supports the spring 160 and is coupled to an upper portion of the guide tube 130 .
  • connection member 190 is coupled to a lower portion of the valve body 140 .
  • the connection member 190 is coupled to a rotary shaft 181 of the motor 180 to transfer driving force generated by the motor 180 to the valve body 140 .
  • a sealing member 145 for sealing an inner lower end of the valve body 140 is inserted into a lower end of the valve body 140 .
  • the outer side of the housing 10 is further provided with the motor 180 for rotating the valve body 140 coupled to the connection member 190 by coupling of the rotary shaft 181 and the connection member 190 .
  • the motor 180 provides torque to the valve body 140 .
  • the rotary shaft 181 has protrusions 182 formed at intervals of 90 degrees and the protrusions 182 operate a limit switch 201 along with rotation of the motor 180 such that a rotation angle of the valve body 140 is controlled.
  • the limit switch 201 is provided inside a switch box 200 and the switch box 200 is interposed between the housing 10 and the motor 180 .
  • a combustion apparatus may be actuated by means of a low heating value.
  • valve body 140 is rotated and the valve body cam 141 formed therein is also rotated, the respective convex portions (tip portions) of the valve body cam 141 and the moving body cam 121 come into contact with each other, thereby allowing the moving body cam 121 to be pushed up along with rotation of the valve body cam 141 .
  • the convex guides 122 are inserted into the concave guides 131 , the moving body 120 is easily moved upward within the guide tube 130 .
  • the second passage 12 is opened and secondary gas is simultaneously introduced through the gas outlet 143 by decoupling of the lower end of the gas outlet 123 of the moving body 120 from the sealing member 145 , as shown in FIGS. 2B and 5B .
  • the secondary gas is mixed with the air and gas introduced through the second passage 12 and is then mixed with the air and gas introduced through the first passage 11 and the first gas inlet 14 , so that a large amount of mixture is generated and the mixture is introduced into the turbofan.
  • the combustion apparatus may be actuated by means of a high heating value.
  • the valve body 140 is returned to the state shown in FIGS. 1B , 2 A, and 5 A. Consequently, the second passage 12 and the gas outlet 143 are blocked and, as such, the combustion apparatus is actuated by means of a low heating value.
  • the spring 160 provided in the moving body 120 serves to increase restoration of the moving body 120 when the second passage 12 is closed by rotation of the valve body 140 .
  • the rotary shaft 181 of the motor 180 has the protrusions 182 which are protrudingly formed on an outer peripheral surface thereof at intervals of 90 degrees and the limit switch 201 has movable protrusions 202 formed to be located on the same circumference as the protrusions 182 .
  • the limit switch 201 causes a short circuit current and, as such, rotation of the motor 180 is stopped.
  • the combustion apparatus when the combustion apparatus is actuated, the protrusions 182 are rotated by 90 degrees to press the movable protrusions 202 . Then, the limit switch 201 is turned off to stop rotation of the motor 180 and the valve body 140 is also stopped. As a result, the second passage 12 is opened or closed.
  • valve body 141 : valve body cam
  • connection member 182 protrusion
  • 190 connection member

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Regulation And Control Of Combustion (AREA)
US14/378,966 2012-02-15 2013-01-18 Dual venturi for combustor Abandoned US20150056563A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2012-0015100 2012-02-15
KR1020120015100A KR101308922B1 (ko) 2012-02-15 2012-02-15 연소기기용 듀얼 벤츄리
PCT/KR2013/000443 WO2013122333A1 (ko) 2012-02-15 2013-01-18 연소기기용 듀얼 벤츄리

Publications (1)

Publication Number Publication Date
US20150056563A1 true US20150056563A1 (en) 2015-02-26

Family

ID=48984415

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/378,966 Abandoned US20150056563A1 (en) 2012-02-15 2013-01-18 Dual venturi for combustor

Country Status (7)

Country Link
US (1) US20150056563A1 (ko)
EP (1) EP2816286A4 (ko)
JP (1) JP5908124B2 (ko)
KR (1) KR101308922B1 (ko)
CN (1) CN104114946B (ko)
AU (1) AU2013221125B2 (ko)
WO (1) WO2013122333A1 (ko)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170219247A1 (en) * 2016-02-02 2017-08-03 DAESUNG CELTIC ENERSYS Co., Ltd Turn Down Ratio (TDR) Damper
CN107265563A (zh) * 2017-08-07 2017-10-20 西南石油大学 一种串联式文丘里管空化装置
EP3460330A1 (de) * 2017-09-25 2019-03-27 Robert Bosch GmbH Mischeinrichtung für heizgeräte sowie heizgeräte mit einer solchen mischeinrichtung
US20200363099A1 (en) * 2017-12-29 2020-11-19 Kyungdong Navien Co., Ltd. Smoke tube boiler
GB2625443A (en) * 2022-02-09 2024-06-19 Kyungdong Navien Co Ltd Dual venturi

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6509724B2 (ja) * 2012-04-20 2019-05-08 アプティーボ リサーチ アンド デベロップメント エルエルシー Ｃｄ３結合ポリペプチド
KR101448992B1 (ko) * 2013-04-16 2014-10-13 주식회사 경동나비엔 연소기기용 듀얼 벤츄리
JP6050281B2 (ja) * 2014-06-06 2016-12-21 リンナイ株式会社 予混合装置
CN105650692B (zh) * 2016-03-25 2017-11-07 熊菊莲 一种可远程操控且安全节能的燃烧控制器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220709A (en) * 1962-12-14 1965-11-30 Thadie H Pickron Device for supplying a fuel and air mixture to internal combustion engines
US4408581A (en) * 1980-10-24 1983-10-11 Vdo Adolf Schindling Ag Device for controlling the speed of travel and regulating the idling speed of automotive vehicles with an Otto engine
US4572809A (en) * 1982-12-17 1986-02-25 Bothwell Peter W Carburettor
JP2001173949A (ja) * 1999-12-16 2001-06-29 Harman Co Ltd 燃焼装置
US20130224670A1 (en) * 2010-07-12 2013-08-29 Gas Point S.R.L. Premix gas burner

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5730656U (ko) * 1980-07-25 1982-02-18
JPS59200118A (ja) * 1983-04-27 1984-11-13 Matsushita Electric Ind Co Ltd 燃料空気混合装置
JP2001303979A (ja) * 2000-04-26 2001-10-31 Mitsubishi Electric Corp 内燃機関の吸気量制御装置及びその製造方法
GB2423119B (en) * 2005-08-05 2007-08-08 Scion Sprays Ltd A Fuel injection system for an internal combustion engine
KR100805630B1 (ko) 2006-12-01 2008-02-20 주식회사 경동나비엔 가스보일러의 연소장치
KR100851635B1 (ko) * 2007-07-16 2008-08-13 한국에너지기술연구원 자기축열식 버너의 3웨이 절환밸브
GB2454256B (en) * 2007-11-03 2011-01-19 Schlumberger Holdings Determination of density and flowrate for metering a fluid flow
ITBO20080278A1 (it) * 2008-04-30 2009-11-01 Gas Point S R L Bruciatore a gas a pre-miscelazione
KR101019403B1 (ko) * 2008-08-12 2011-03-07 주식회사 경동네트웍 보일러의 가스-공기 혼합 장치
JP5509981B2 (ja) * 2010-03-26 2014-06-04 Ｊｆｅエンジニアリング株式会社 流体混合方法及び流体混合装置
CN202117797U (zh) * 2011-06-11 2012-01-18 张海辉 带燃气补偿支路的燃气混合器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220709A (en) * 1962-12-14 1965-11-30 Thadie H Pickron Device for supplying a fuel and air mixture to internal combustion engines
US4408581A (en) * 1980-10-24 1983-10-11 Vdo Adolf Schindling Ag Device for controlling the speed of travel and regulating the idling speed of automotive vehicles with an Otto engine
US4572809A (en) * 1982-12-17 1986-02-25 Bothwell Peter W Carburettor
JP2001173949A (ja) * 1999-12-16 2001-06-29 Harman Co Ltd 燃焼装置
US20130224670A1 (en) * 2010-07-12 2013-08-29 Gas Point S.R.L. Premix gas burner

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170219247A1 (en) * 2016-02-02 2017-08-03 DAESUNG CELTIC ENERSYS Co., Ltd Turn Down Ratio (TDR) Damper
US10168074B2 (en) * 2016-02-02 2019-01-01 DAESUNG CELTIC ENERSYS Co., Ltd Turn down ratio (TDR) damper
CN107265563A (zh) * 2017-08-07 2017-10-20 西南石油大学 一种串联式文丘里管空化装置
EP3460330A1 (de) * 2017-09-25 2019-03-27 Robert Bosch GmbH Mischeinrichtung für heizgeräte sowie heizgeräte mit einer solchen mischeinrichtung
US20200363099A1 (en) * 2017-12-29 2020-11-19 Kyungdong Navien Co., Ltd. Smoke tube boiler
US11624527B2 (en) * 2017-12-29 2023-04-11 Kyungdong Navien Co., Ltd. Smoke tube boiler
GB2625443A (en) * 2022-02-09 2024-06-19 Kyungdong Navien Co Ltd Dual venturi

Also Published As

Publication number Publication date
WO2013122333A1 (ko) 2013-08-22
EP2816286A1 (en) 2014-12-24
JP5908124B2 (ja) 2016-04-26
JP2015507169A (ja) 2015-03-05
KR20130093884A (ko) 2013-08-23
CN104114946A (zh) 2014-10-22
AU2013221125B2 (en) 2015-12-10
EP2816286A4 (en) 2015-11-11
CN104114946B (zh) 2016-11-23
KR101308922B1 (ko) 2013-09-23
AU2013221125A1 (en) 2014-08-28

Similar Documents

Publication Publication Date Title
AU2013221125B2 (en) Dual venturi for combustor
US10393370B2 (en) Dual venturi for combustion apparatus
CA2903186C (en) Dual venturi for combustion device
JP5948440B2 (ja) 燃焼機器用ガス‐空気混合装置
JP5828971B2 (ja) 燃焼機器用ガス‐空気混合装置
CA2892463C (en) Dual venturi for combustor

Legal Events

Date Code Title Description
AS Assignment

Owner name: KYUNGDONG NAVIEN CO., LTD., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KIM, KYEONG JOO;REEL/FRAME:033678/0651

Effective date: 20140813

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION