EP2863120A1 - Appareil de chauffage doté d'un brûleur assisté d'un ventilateur - Google Patents

Appareil de chauffage doté d'un brûleur assisté d'un ventilateur Download PDF

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Publication number
EP2863120A1
EP2863120A1 EP20140186733 EP14186733A EP2863120A1 EP 2863120 A1 EP2863120 A1 EP 2863120A1 EP 20140186733 EP20140186733 EP 20140186733 EP 14186733 A EP14186733 A EP 14186733A EP 2863120 A1 EP2863120 A1 EP 2863120A1
Authority
EP
European Patent Office
Prior art keywords
fuel
opening
heater
air
sleeve
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.)
Granted
Application number
EP20140186733
Other languages
German (de)
English (en)
Other versions
EP2863120B1 (fr
Inventor
Franz Schmuker
Albrecht Schaefer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP2863120A1 publication Critical patent/EP2863120A1/fr
Application granted granted Critical
Publication of EP2863120B1 publication Critical patent/EP2863120B1/fr
Active legal-status Critical Current
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
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
    • 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
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/007—Regulating fuel supply using mechanical means

Definitions

  • the invention relates to a heater with a burner supported by a fan, in which a preferably gaseous fuel in a fuel-air mixing device is supplied into the flowing air in the region of a constriction via at least one opening.
  • the DE 102010044591 A1 shows and describes a fuel-air mixing device in the form of a venturi passage in which air is forced via a blower in the Venturi inlet to be mixed with gas shortly after the venturi throat.
  • the gas is supplied via a gas regulator and a short supply line, in which the gas flow both in the pressure and in their flow are influenced and throttled. Heaters with such an arrangement are too limited in their ability to vary the power for today's wishes.
  • the heater according to the invention with the features of the main claim has the advantage that by the fact that the opening is adjustable, manufacturing tolerances can be compensated.
  • the opening can be adjusted extremely precisely so that the main throttling of the fuel can take place after the pressure adjustment at this opening.
  • different fuel types can be supplied and the mixing ratios can be optimized by adjusting the opening. Even age-related changes to the geometric or fluidic conditions can be easily compensated.
  • the locking device is closable, in particular sealable. Under sealable is to be understood that after the adjustment can be attached only by destruction removable closure.
  • a particularly advantageous locking device may have a locking screw. This is preferably mounted so that it does not urge the opening in one direction during and after the detection.
  • the closeability can be achieved in that the locking screw has a protective cap.
  • the protective cap is preferably designed such that it or parts thereof can be removed again after application only by destruction. Thus, a subsequent manipulation can be determined.
  • the locking device has a latching element, a simple, self-locking latch can be achieved.
  • the locking element can be designed so that the lock can be opened only by destruction of the locking element or a locking element covering the wall.
  • a likewise particularly simple and multiple-use locking device can be created by providing a hinged element.
  • a folding element can engage in a grid and effectively prevent an adjustment of the opening.
  • the folding element has a through hole which is aligned with a through hole of a stationary element, the folding element can be secured or sealed.
  • the opening is formed as an annular gap.
  • This annular gap can be varied in its width and so the size of the opening can be adjusted.
  • the supply ratios of the fuel in the area of the constriction improve when the opening is an annular gap. The supply of the fuel thereby stabilizes the flow conditions over the entire circumference of the Venturi formed as fuel-air mixing device.
  • the opening between a base body and a sleeve is formed. If the sleeve is then movable relative to the main body, the size of the opening can be varied in this way.
  • the pressure level can be adjusted when a pressure control valve is provided.
  • the opening In the direction of the fuel via the pressure regulating valve to the opening, the opening represents the substantial throttling of the fuel between the line and the admixture with the air, whereby the power modulation can be significantly increased.
  • the significant pressure drop for the fuel takes place. It has been shown that by this measure at the bottleneck through this fuel introduction, a flow is achieved through which the fuel-air mixture can be metered very accurately because the introduction of the fuel takes place at high speed, which stabilizes the flow in the Venturi and optimally utilizes the negative pressure conditions in the area of the Venturi bottleneck.
  • the fuel-air ratio remains constant. This is particularly an advantage when heaters over a large modulation range in their performance must be varied, for example, because on the one hand well-insulated houses have a low power value for the heater but should have a high power value for the domestic water.
  • the supply of fuel can be done as in StdT over a very short line or via a guided through the heater line. It is advantageous if the main throttling of the fuel takes place just at the opening in the region of the constriction of the Venturi and not before.
  • the fuel regulating valve usually provided in the fuel supply line throttles the fuel passage as well.
  • the main task of this valve is to provide the fuel with a (pre-) determinable pressure, usually equal to or substantially equal to the ambient pressure, and not the fuel throttling for the fuel metering. Under essential throttling should therefore be understood that from the point at which the fuel is provided with a predeterminable pressure, no greater throttling than at the opening takes place.
  • a fuel-air mixing device with an air inlet, a constriction and an opening in the region of the throat for supplying fuel, wherein the opening is formed adjustable, has the advantage that they have a preset fuel-air mixture over a wide Capacity range can be kept constant. This is particularly advantageous for heaters having a power-modulatable fan, which then works together with the fuel-air mixing device according to the invention.
  • the fan may be arranged upstream of the fuel-air mixing device or, more advantageously, in the flow direction thereafter.
  • FIG. 1 schematically a heater 10 is shown, which has a fan 12, a burner 14 and a fuel-air mixing device 16.
  • the fuel-air mixing device 16 is shown schematically in FIG FIG. 2 illustrated, in which it can be seen that in the region of a constriction 18 incoming air 20 (shown by an arrow) fuel 22 (also shown by an arrow) is supplied via an opening 24.
  • FIG. 1 Further assemblies of the heater 10 according to the invention are shown.
  • the fuel 22 is supplied via a fuel line 26 and a fuel control valve 28 via a line 30 of the fuel-air mixing device 16.
  • the fuel control valve 28 is configured to regulate the fuel independently of its input pressure to an ambient pressure proportional, equal, or substantially equal value.
  • the line 30 is shown here as a separate line. But it can also, especially if the fuel control valve 28 is connected directly to the fuel-air mixing device 16 (as in FIG. 3 shown in phantom), as an internal passage to be configured.
  • the fuel 22 is mixed with the incoming air 20, sucked by the fan 12 and fed to the burner 14 via a feed hood 32.
  • a heat exchanger 34 is arranged below the burner 14 designed as a down-flow burner, to which a supply line 36 and a return line 38 for heating water are connected.
  • the heat exchanger 34 flows through the hot exhaust gas, cools it and supplies it to an exhaust gas line 40, which opens into an exhaust gas outlet 42.
  • a controller 44 and an expansion vessel 46 are also housed.
  • a controller 44 and an expansion vessel 46 are also housed.
  • an additional domestic water heat exchanger or various pumps and mixers may be provided.
  • FIG. 2 the operation of the heater 10 according to the invention is shown.
  • the fan 12 draws in via the fuel-air mixing device 16 according to the invention a fuel-air mixture and conveys it to the burner 14, on the underside of which, monitored by a flame monitoring device 48 flame 50 burns.
  • the fuel-air mixing device 16 according to the invention has the form of a venturi tube, at the inlet 52 of which ambient air is sucked in and accelerated to the constriction 18.
  • the fuel 22 is provided in a fuel chamber 54 under defined pressure, in order to then be sucked through the annular opening 24 substantially in the flow direction.
  • the Venturi effect helps, according to which the intake of the fuel is favored by the fast flowing air.
  • the pressure ratios are set so that the ambient pressure of the supplied air 20 and the pressure of the fuel 22 in the fuel chamber 54 are almost equal and takes place in the mixing ratio in the constriction 18 in the correct mixing ratio. Because the introduction of the gaseous fuel in the direction and speed substantially corresponds to the air flow and takes place along the re-expanding after the bottleneck environment of the Venturi tube, over the prior art significantly improved flow is achieved in the diffuser. As a result, the fan 12 can be modulated in a wide modulation range and the output power of the heater 10 according to the invention can be influenced.
  • the fuel-air mixing device 16 according to the invention is shown in more detail. It can be seen that at the constriction 18, the opening 24 is annular and fuel 22 can flow from the fuel chamber 54 into the Venturi arrangement. It can be seen that the fuel 22, starting from the opening 24 along the path 56 in the flow direction of the incoming air 20 can be fed.
  • the fuel 22 flows along an inner wall 58 of the fuel-air mixing device 16. In the further course begins mixing between the fuel 22 and air 20, which is then completed in the fan 12 to a homogeneous mixing.
  • These pressure ratios make it possible to keep the optimum mixing ratio of air 20 and fuel 22 constant over a large modulation range of the blower 12.
  • the opening 24 is formed between an extension of the inner wall 58 and a pipe section 60 of the inlet 52.
  • the particular construction is designed so that the pipe section 60 can be displaced relative to the inner wall 58 and the opening 24 is thus made adjustable in size ,
  • the pipe section 60 is part of a sleeve 62, which in turn cooperates with a base body 64 of the fuel-air mixing device 16.
  • the inner wall 58, the pipe section 60, the sleeve 62 and the base body 64 include the fuel chamber 54 in it.
  • a connection 66 for connecting the line 30 for supplying the fuel 22 is integrally formed on the base body 64.
  • the main body 64 and the sleeve 62 are connected to each other via a thread 68. This makes it possible to achieve by rotating the sleeve 62 relative to the base body 64, an axial displacement of the sleeve 62 to the base body 64 and to adjust the opening 24 in size.
  • a continuation 69 of the sleeve 62 beyond the thread 68 one or more seals or sealing spaces 70 are provided, which seal the fuel chamber 54 to the outside.
  • the opening 24 could be adjusted by moving the sleeve 62 relative to the main body 64.
  • a locking device 72 is located.
  • the locking device 72 acts between the main body 64 and the sleeve 62. It prevents the once set size of the opening 24 is changed again. In the exemplary embodiment, this is done by preventing the sleeve 62 from twisting against the base body 64. Should the sleeve 62 act by displacement to the size of the opening 24, the locking device 72 would be designed so that it can prevent displacement.
  • FIG. 5 a first embodiment of a locking device 72 in the form of a locking screw 74 is shown. About this locking screw 74 integrally formed on the collar 62 collar 76 is clamped by means of the screw head 78 relative to the base body 64.
  • a displacement body 80 is arranged, which has a polygonal outer profile, via which it is arranged displaceably in an identically shaped inner profile.
  • the sliding body 80 sets when the locking screw 74 is tightened, tension on the collar 74 at.
  • the screw head 78 is provided with a metal protective cap 82 into which a cup-shaped closure part 84 can be pressed.
  • FIG. 6 Another embodiment of a locking device 72 is shown in FIG. 6 to see.
  • a latching element 86 is provided which engages in a recessed on a collar 88 of the base 64 opening 90.
  • the latching element 86 is formed on a latching clip 92, which can be pushed onto the collar 88 in the drawing from above, so that the latching element 86 deflects and locks on further impressions into the opening 90.
  • an extension 94 on a circumferential collar 96 is pressed, which is integrally formed on the sleeve 62.
  • the collar 96 recesses 98 engage in the walls 100 of the extension 94 and prevent further rotation of the sleeve 62 relative to the base 64. In this way it is ensured that there is no tension between the sleeve 62 and the base body 64 when pressing the locking clip 92, which could possibly influence the size of the opening 24.
  • the latching clip 92 is designed such that the latching element 86 can only be moved out of the opening 90 by puncturing a thin wall 102 attached to the latching clip 92. As a result, a manipulation, as it takes place, subsequently recognizable.
  • FIG. 7 A third, a folding element 104 exhibiting embodiment is in FIG. 7 shown.
  • the folding element 104 has an in side view L-shaped and in cross-section U-shaped bracket 106, which is articulated on a molded-on base member first block 108.
  • the bracket 106 can be given away or folded in the direction of an integrally formed on the sleeve 62 circumferential collar 110.
  • the circumferential collar 110 has a plurality of grooves 112, in which the walls of the U-shaped bracket 106 can engage. A rotation of the sleeve 62 relative to the base body 64 is thereby prevented and the size of the adjusted opening 24 is locked.
  • a second block 112 is formed on the base body 64 having a through hole 114 which is aligned with a through hole 116 on the bracket 106 in the locked position.
  • this opening structure for example, the wire of a seal can be threaded and secured. The folding element 104 is thus secured against manipulation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Feeding And Controlling Fuel (AREA)
EP14186733.3A 2013-10-16 2014-09-29 Dispositif de mélange combustible-air Active EP2863120B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201310220952 DE102013220952A1 (de) 2013-10-16 2013-10-16 Heizgerät mit einem von einem Gebläse unterstützten Brenner

Publications (2)

Publication Number Publication Date
EP2863120A1 true EP2863120A1 (fr) 2015-04-22
EP2863120B1 EP2863120B1 (fr) 2023-03-15

Family

ID=51626421

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14186733.3A Active EP2863120B1 (fr) 2013-10-16 2014-09-29 Dispositif de mélange combustible-air

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EP (1) EP2863120B1 (fr)
DE (1) DE102013220952A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9746176B2 (en) 2014-06-04 2017-08-29 Lochinvar, Llc Modulating burner with venturi damper
EP3892919A1 (fr) * 2020-02-24 2021-10-13 Vaillant GmbH Dispositif de guidage d'écoulement permettant de guider au moins un écoulement de fluide dans la zone d'un dispositif de transport d'un appareil chauffant pour un bâtiment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022112769A1 (de) 2022-05-20 2023-11-23 Vaillant Gmbh Heizgerät und Verwendung einer Einstellanordnung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799195A (en) * 1971-03-17 1974-03-26 Four Industriel Belge Device for controlling a mixture of two gases
DE3724344A1 (de) * 1987-07-23 1989-02-02 Huels Chemische Werke Ag Mischduese zum vermischen zweier gasstroeme
SU1615467A1 (ru) * 1988-06-03 1990-12-23 Донецкий политехнический институт Инжекционна горелка
WO2012007823A1 (fr) * 2010-07-12 2012-01-19 Gas Point S.R.L. Brûleur à gaz à prémélange
DE102010044591A1 (de) 2010-09-07 2012-03-08 Honeywell Technologies Sarl Gasregelgerät mit angebauter Venturi-Düse
WO2012156077A1 (fr) * 2011-05-19 2012-11-22 Mtu Friedrichshafen Gmbh Mélangeur de gaz, système de mélange de gaz et moteur à gaz

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8800711U1 (de) * 1988-01-22 1988-04-14 Motoren-Werke Mannheim AG, 6800 Mannheim Venturi-Mischer zum Mischen von Gas und Luft insbesondere für einen Verbrennungsmotor
DE4137573C2 (de) * 1991-11-15 1998-01-15 Motoren Werke Mannheim Ag Venturi-Mischer zum Mischen von Gas und Luft, insbesondere für einen Verbrennungsmotor
DE19729047C1 (de) * 1997-07-08 1998-09-24 Honeywell Bv Mischvorrichtung zur Erzeugung eines Gemisches aus Gas und Verbrennungsluft für einen Brenner
AR024718A1 (es) * 2000-07-12 2002-10-23 Ricardo Cayetano Algeri Dispositivo mezclador de gas combustible con aire para motores de combustion interna
BE1018675A3 (fr) * 2009-03-03 2011-06-07 Fib Belgium Sa Dispositif de dosage d'un melange gazeux.
KR101308936B1 (ko) * 2012-02-06 2013-09-23 주식회사 경동나비엔 연소기기용 가스 공기 혼합장치
CN104275102A (zh) * 2013-07-02 2015-01-14 德昌电机(深圳)有限公司 文丘里混合器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799195A (en) * 1971-03-17 1974-03-26 Four Industriel Belge Device for controlling a mixture of two gases
DE3724344A1 (de) * 1987-07-23 1989-02-02 Huels Chemische Werke Ag Mischduese zum vermischen zweier gasstroeme
SU1615467A1 (ru) * 1988-06-03 1990-12-23 Донецкий политехнический институт Инжекционна горелка
WO2012007823A1 (fr) * 2010-07-12 2012-01-19 Gas Point S.R.L. Brûleur à gaz à prémélange
DE102010044591A1 (de) 2010-09-07 2012-03-08 Honeywell Technologies Sarl Gasregelgerät mit angebauter Venturi-Düse
WO2012156077A1 (fr) * 2011-05-19 2012-11-22 Mtu Friedrichshafen Gmbh Mélangeur de gaz, système de mélange de gaz et moteur à gaz

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9746176B2 (en) 2014-06-04 2017-08-29 Lochinvar, Llc Modulating burner with venturi damper
US10161627B2 (en) 2014-06-04 2018-12-25 Lochinvar, Llc Modulating burner with venturi damper
EP3892919A1 (fr) * 2020-02-24 2021-10-13 Vaillant GmbH Dispositif de guidage d'écoulement permettant de guider au moins un écoulement de fluide dans la zone d'un dispositif de transport d'un appareil chauffant pour un bâtiment

Also Published As

Publication number Publication date
DE102013220952A1 (de) 2015-04-16
EP2863120B1 (fr) 2023-03-15

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