EP2612074B1 - An air-gas mixer device for premix combustible gas burners - Google Patents

An air-gas mixer device for premix combustible gas burners Download PDF

Info

Publication number: EP2612074B1
Authority: EP; European Patent Office
Prior art keywords: impeller; blades; duct; section; mixer device
Prior art date: 2010-09-02
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

Application number

EP11752199.7A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP2612074A2 (en

Inventor

Gianfranco Scribano

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.)

Sit SpA

Original Assignee

Sit SpA

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.)

2010-09-02

Filing date

2011-08-31

Publication date

2018-01-17

2011-08-31 Application filed by Sit SpA filed Critical Sit SpA

2013-07-10 Publication of EP2612074A2 publication Critical patent/EP2612074A2/en

2018-01-17 Application granted granted Critical

2018-01-17 Publication of EP2612074B1 publication Critical patent/EP2612074B1/en

Status Active legal-status Critical Current

2031-08-31 Anticipated expiration legal-status Critical

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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
- F23D14/46—Details
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- 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
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers

Definitions

the present invention relates to a mixer device for premix gas burners having the characteristics stated in the preamble to Claim 1, which is the principal claim.
a mixer device is known from DE 10 2007 022 008 A1 .
the invention relates particularly, although not exclusively, to the technical field of boilers for domestic use, designed for space heating and/or water heating.
boilers for domestic use must meet various requirements including some relating to the comfort of users and to safety.
the safety requirements include provision for action in response to any obstructions that may occur in the outlet flue.
a boiler can normally be considered as a system in which the inputs are gas and cold water and the outputs are hot water and combustion products created by the combustion of gas and air.
the combustion products are evacuated through a duct, or flue, which carries them to the outside of the building in which the equipment is installed, and expels them into the external environment.
the flue is typically a cylindrical tube with one end connected to the combustion chamber and the other end connected to an outside terminal. Since the terminal is in the external environment, it may become obstructed or blocked by external agents, such as birds building nests or objects carried by the wind and landing on the terminal. In such conditions, in other words if the terminal is blocked, the boiler must be turned off or must operate with its carbon monoxide output reduced below the limits set by regulations.
the combustion process in the boiler takes place in a combination of air and combustible gas, the air being supplied to the inside of the equipment by a fan. Before reaching the fan, the intake air flows into a mixer and creates a vacuum, thereby drawing in the combustible gas.
the mixer is made in the form of a converging duct and the vacuum is created in the part with the smallest cross section. The gas is injected into the flow of air through a duct coaxial with the converging duct.
a diverging duct whose length is at least equal to that of the converging duct, is fitted downstream of the minimum cross section.
the quantity of gas drawn in by the vacuum is regulated by a gas valve which keeps the gas to air ratio constant if the rotation speed of the fan varies.
the gas to air ratio should remain constant when the air flow rate falls below the minimum required flow rate.
the combustion process is continued, with carbon monoxide output kept within the limits, and below a certain level of thermal power the boiler is turned off.
the boiler is turned off either because the flame can no longer be kept stable or because the safety system of the boiler, which detects the presence of a flame by means of an electrode, measures an ionization current in the flame which is lower than the reference limit set in the electronic circuit board of the boiler, and therefore acts to close the gas valve.
the gas to air ratio increases when the flue is obstructed.
the increase in the ratio is due to an increase in the vacuum and consequently in the quantity of gas injected.
This phenomenon arises because of the different fluid dynamic conditions which are created in the area of the aperture (the intake section) of the impeller. In these conditions, vortices are generated with their axes coaxial with the axis of rotation of the impeller, with recirculation between the inlet and outlet of the blade channel.
the problem to be solved by the present invention is that of providing an air-gas mixer device of the aforesaid type which is structurally and functionally designed so as to overcome the limitations of the prior art described above.
the number 1 indicates a boiler with a combustible gas burner with air and gas premixing, for example a boiler used for heating an environment 2, in which the combustion chamber (not shown) is connected, via a combustion fume outlet duct 3, to a discharge terminal 4, shown schematically, located outside the environment.
the boiler 1 contains a burner which is supplied with the combustible air-gas mixture previously mixed in a mixer device 5, shown schematically in Figure 2 in a known configuration.
the device comprises a fan unit 6 with an impeller 7, driven about an axis of rotation X, which is provided with radial blades 8 extending between an axial intake section 9 and a radially opposed delivery section 10.
the impeller 7 is housed in an enclosure 11 in which the sections 9 and 10 are formed.
Each of the impeller blades 8 projects from a base surface 12 of the impeller, extends transversely to the axis X, and has one edge 13 in the intake section 9, pairs of adjacent edges delimiting the leading edges or mouths of corresponding blade channels extending between pairs of adjacent blades along the extension of the blades between sections 9 and 10.
the mixer device Upstream of the intake section 9 of the fan, from which the air is drawn by the fan and sent to the burner, the mixer device comprises a tubular duct 15 designed to guide the air, this duct being positioned coaxially with the axis X and having a terminal portion 15a converging towards the intake section 9, the free end of this portion having the minimum cross section.
a vacuum is created in this section by the convergent geometry and draws in a flow of gas which is guided through a second tubular duct 16 formed at least partially inside the duct 15 and coaxially therewith.
the duct 16 can also extend outside the duct 15.
the quantity of gas drawn in by the vacuum is regulated, in a conventional way, by a gas valve (not shown) which keeps the gas to air ratio constant if the rotation speed of the fan varies.
the device 1 also comprises at least one appendage in the form of a stator blade element 20, projecting from the lateral profile of the duct 15 on the outside of the duct, away from the axis X.
the at least one blade element 20 can extend from the lateral profile of the converging element so as to occupy this area at least partially, while being spaced apart from the blades of the impeller in order to avoid interference with these blades.
Figures 4 and 5 show alternative configurations of the area delimiting the blade element 20, according to different frontal profiles of the manifold 11.
the blade element 20 has a platelike shape with opposing faces 20a, delimiting a transverse thickness 20b.
stator blade element 20 extends radially with respect to the axis of rotation X, and its opposite faces 20a are flat. Clearly, other shapes or positions are possible. The number and angular positioning of the blade elements 20 can also vary.
blade elements 20 are provided and are located circumferentially at equal angular intervals.
the blade elements extend radially with a flat surface profile having a rectangular geometry.
each of the blade elements 20 has a thickness 20b greater than 0.2 mm, and conveniently made equal to 1 mm, while the converging duct 15 has a wall with a thickness 21 of less than 3 mm at its end with the minimum cross section.
stator blade element The functions of the stator blade element according to the invention are described in detail below.
the gas to air ratio tends to increase. This increase is due to an increase in the vacuum and consequently in the quantity of gas injected. This phenomenon arises because of the different fluid dynamic conditions which are created in the area of the aperture of the impeller. In these conditions, vortices are generated with their axes coaxial with the axis of rotation X, with recirculation between the inlet and outlet of the blade channel.
the provision of at least one appendage or blade 20, located in the area described above, tends to oppose these fluid dynamic actions of the combustible mixture, leading to an improvement in performance during the obstruction of the flue.
the air to gas ratio tends to decrease when the obstruction increases, causing the boiler to be turned off safely.
the solution described above enables a compact configuration of the mixer to be maintained, and moreover the decrease of the gas to air ratio is a further safety parameter, since when the gas to air ratio decreases the flame also tends to be extinguished because of instability, without causing carbon monoxide production.

Landscapes

Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Chemical & Material Sciences (AREA)
Combustion & Propulsion (AREA)
Gas Burners (AREA)
Structures Of Non-Positive Displacement Pumps (AREA)
Pre-Mixing And Non-Premixing Gas Burner (AREA)

EP11752199.7A 2010-09-02 2011-08-31 An air-gas mixer device for premix combustible gas burners Active EP2612074B1 (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
ITPD2010A000265A IT1402076B1 (it)	2010-09-02	2010-09-02	Dispositivo miscelatore aria-gas per bruciatori a gas combustibile con premiscelazione
PCT/EP2011/065060 WO2012028667A2 (en)	2010-09-02	2011-08-31	An air-gas mixer device for premix combustible gas burners

Publications (2)

Publication Number	Publication Date
EP2612074A2 EP2612074A2 (en)	2013-07-10
EP2612074B1 true EP2612074B1 (en)	2018-01-17

Family

ID=43707984

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP11752199.7A Active EP2612074B1 (en)	2010-09-02	2011-08-31	An air-gas mixer device for premix combustible gas burners

Country Status (7)

Country	Link
EP (1)	EP2612074B1 (it)
KR (1)	KR20130100302A (it)
CN (1)	CN103201561B (it)
IT (1)	IT1402076B1 (it)
RU (1)	RU2576555C2 (it)
UA (1)	UA108663C2 (it)
WO (1)	WO2012028667A2 (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102013101676B4 (de)	2013-02-20	2021-02-11	Mhg Heiztechnik Gmbh	Gasluftmischbehälter und Gasbrenner
DE102013208855B4 (de) *	2013-05-14	2022-07-07	BSH Hausgeräte GmbH	Radialgebläsegehäuse
US11105502B2 (en) *	2019-06-17	2021-08-31	Honeywell International Inc.	Staged fuel burner

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
SU1337607A1 (ru) *	1986-01-16	1987-09-15	Среднеазиатский Филиал Всесоюзного Научно-Исследовательского Института Использования Газа В Народном Хозяйстве И Подземного Хранения Нефти,Нефтепродуктов И Сжиженных Газов	Блочна горелка
SU1455137A1 (ru) *	1986-12-08	1989-01-30	Среднеазиатский Филиал Всесоюзного Научно-Исследовательского Института Использования Газа В Народном Хозяйстве Подземного Хранения Нефти,Нефтепродуктов И Сжиженных Газов	Горелка
DE19733769C2 (de) *	1997-08-05	2003-05-22	Dungs Karl Gmbh & Co	Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
ITPD20010023A1 (it) *	2001-02-01	2002-08-01	Sit La Precisa Spa	Dispositivo miscelatore aria-gas perfezionato.
DE60226079D1 (de) *	2002-04-30	2008-05-21	Sit La Precisa Spa	Luft-gas-mischvorrichtung, insbesondere für gasbrenner und ähnliche apparate
AT412667B (de) *	2003-01-27	2005-05-25	Vaillant Gmbh	Mischvorrichtung für brenngas und luft
DE102007022008B4 (de) *	2007-05-08	2009-02-26	Saia-Burgess Dresden Gmbh	Kombinierte Lüfter-/Gasventileinheit

2010
- 2010-09-02 IT ITPD2010A000265A patent/IT1402076B1/it active
2011
- 2011-08-31 EP EP11752199.7A patent/EP2612074B1/en active Active
- 2011-08-31 UA UAA201304048A patent/UA108663C2/ru unknown
- 2011-08-31 CN CN201180042247.4A patent/CN103201561B/zh not_active Expired - Fee Related
- 2011-08-31 RU RU2013114485/06A patent/RU2576555C2/ru active
- 2011-08-31 WO PCT/EP2011/065060 patent/WO2012028667A2/en not_active Ceased
- 2011-08-31 KR KR1020137008270A patent/KR20130100302A/ko not_active Abandoned

Also Published As

Publication number	Publication date
ITPD20100265A1 (it)	2012-03-03
EP2612074A2 (en)	2013-07-10
KR20130100302A (ko)	2013-09-10
WO2012028667A8 (en)	2013-03-14
CN103201561B (zh)	2016-06-01
WO2012028667A2 (en)	2012-03-08
RU2013114485A (ru)	2014-10-10
UA108663C2 (uk)	2015-05-25
WO2012028667A3 (en)	2012-06-21
IT1402076B1 (it)	2013-08-28
CN103201561A (zh)	2013-07-10
RU2576555C2 (ru)	2016-03-10

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Publication	Publication Date	Title
JPH0210012A (ja)	1990-01-12	小型ガスパワーバーナー
CN109945181A (zh)	2019-06-28	带废气再循环和部分预混的低NOx燃烧器
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