EP0907051B1 - Venturi for mixing gas and air for a gas burner - Google Patents

Venturi for mixing gas and air for a gas burner Download PDF

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Publication number
EP0907051B1
EP0907051B1 EP98118353A EP98118353A EP0907051B1 EP 0907051 B1 EP0907051 B1 EP 0907051B1 EP 98118353 A EP98118353 A EP 98118353A EP 98118353 A EP98118353 A EP 98118353A EP 0907051 B1 EP0907051 B1 EP 0907051B1
Authority
EP
European Patent Office
Prior art keywords
bumps
venturi nozzle
nozzle according
outlet funnel
gas
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.)
Expired - Lifetime
Application number
EP98118353A
Other languages
German (de)
French (fr)
Other versions
EP0907051A1 (en
Inventor
Gerrit Jan Baarda
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.)
Garrett Motion SARL
Original Assignee
Honeywell BV
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 Honeywell BV filed Critical Honeywell BV
Publication of EP0907051A1 publication Critical patent/EP0907051A1/en
Application granted granted Critical
Publication of EP0907051B1 publication Critical patent/EP0907051B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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, 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
    • F23D2212/00—Burner material specifications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14701—Swirling means inside the mixing tube or chamber to improve premixing

Definitions

  • the invention relates to a Venturi nozzle for mixing gas and combustion air for a gas burner according to the preamble of claim 1.
  • a Venturi nozzle for mixing gas and combustion air for a gas burner according to the preamble of claim 1.
  • Such a Venturi nozzle is e.g. known from EP-A-0 685 684.
  • Venturi nozzle for a gas burner is known from DE 195 07 692 A1.
  • a projection in the outlet funnel is formed by a constriction with openings over which Blower air can be supplied.
  • the negative pressure that forms here prevents one Fan failure an outlet of the gas-air mixture.
  • the object of the invention is to provide a generic Verturi nozzle with which Noise from the gas burner can be reduced considerably. This task is accomplished by the characterizing features of claim 1 solved.
  • the noise reduction can be achieved because there is a decrease at the edge of the outlet funnel Pressure waves through the downstream sides of the elevations are strongly dampened during at the same time due to the pointed or rounded design of the surveys on the On the upstream side, the flow resistance of the nozzle is increased only very slightly. With the rib-shaped elevations at the same time the jacket of the outlet funnel is stiffened, thereby preventing the nozzle from vibrating.
  • the Venturi nozzle consists essentially of a conical inlet funnel 1, one in opposite direction frusto-conical outlet funnel 2 with retaining flange 3 and one between the end part 4 of the supply of combustion air A serving Inlet funnel 1 on the one hand and the end 5 of the outlet funnel 2 facing it on the other hand, formed annular gap 6 surrounding the nozzle neck of the Venturi nozzle the combustion gas G flows approximately parallel to the air A into the Venturi nozzle.
  • the Inner wall of the outlet funnel 2 has a plurality of wedge-shaped elevations 7 provided which are pointed or rounded on the inflow side 8. Your rear surface 9 on the downstream side is flat or beveled.
  • the elevations 7 surround the inside of the outflow funnel 2 in several, in Axial direction staggered rings 7a, 7b, 7c, etc., which one another can have different number of surveys 7 and either in Axis direction one behind the other, or as shown in Figure 1, arranged to overlap each other are.
  • the elevations 7 of adjacent rings 7a and 7b or 7b and 7c Gap which increases the soundproofing effect.
  • the one shown Wedge shape of the individual surveys 7 these depending on the expected flow velocity of the air A or the mixture M also one have a different shape.
  • the greatest amount of the individual surveys is no longer than 6% of the nozzle radius at the open end 10 of the outlet funnel 2.
  • the cheapest value of the height depends, among other things. from the opening angle of the Exhaust funnel 2 and increases with larger opening angles.
  • the one in the individual Rings 7a or 7b etc. arranged elevations 7 can also be designed such that their height and / or their width increases from the inlet side to the outlet side.
  • the Elevations 7 can, as indicated in FIG. 1, on the inside of outlet funnel 2 be attached and with the manufacture of the nozzle in the casting or injection molding process be generated. Or you emboss in the case of a thin-walled jacket of the outlet funnel 2 the elevations 7, from the outside, so that they protrude inwards.
  • the the entire Venturi nozzle 1, 2 is surrounded on the outside by an annular chamber, not shown, from which the gas G flows through an annular gap 6 into the nozzle neck.
  • Such a kind the gas supply is described in DE-OS 19 06 652.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Description

Die Erfindung betrifft eine Venturidüse zum Mischen von Gas- und Verbrennungsluft für einen Gasbrenner gemäß dem Oberbegriff des Patentanspruches 1. Eine solche Venturidüse ist z.B. aus der EP-A-0 685 684 bekannt.The invention relates to a Venturi nozzle for mixing gas and combustion air for a gas burner according to the preamble of claim 1. Such a Venturi nozzle is e.g. known from EP-A-0 685 684.

Eine andere Venturidüse für einen Gasbrenner ist aus der DE 195 07 692 A1 bekannt. Bei dieser ist ein Vorsprung im Auslaßtrichter von einer Einschnürung mit Öffnungen gebildet, über die Gebläseluft zuführbar ist. Der sich hier ausbildende Unterdruck verhindert bei einem Gebläseausfall einen Austritt des Gas-Luft-Gemisches.Another Venturi nozzle for a gas burner is known from DE 195 07 692 A1. In this a projection in the outlet funnel is formed by a constriction with openings over which Blower air can be supplied. The negative pressure that forms here prevents one Fan failure an outlet of the gas-air mixture.

Aufgabe der Erfindung ist die Schaffung einer gattungsgemäßen Verturidüse, mit der die Geräusche des Gasbrenners erheblich reduzierbar sind. Diese Aufgabe wird durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst.The object of the invention is to provide a generic Verturi nozzle with which Noise from the gas burner can be reduced considerably. This task is accomplished by the characterizing features of claim 1 solved.

Die Geräuschminderung ist zu erreichen, weil am Rand des Auslaßtrichters rückläufige Druckwellen durch die Abströmseiten der Erhebungen stark gedämpft werden, während zugleich infolge der spitzen oder abgerundeten Ausgestaltung der Erhebungen auf der Anströmseite der Strömungswiderstand der Düse nur ganz unwesentlich erhöht wird. Mit den rippenförmigen Erhebungen wird zugleich der Mantel des Auslaßtrichters versteift, wodurch man verhindert, daß die Düse zu Schwingungen angeregt wird.The noise reduction can be achieved because there is a decrease at the edge of the outlet funnel Pressure waves through the downstream sides of the elevations are strongly dampened during at the same time due to the pointed or rounded design of the surveys on the On the upstream side, the flow resistance of the nozzle is increased only very slightly. With the rib-shaped elevations at the same time the jacket of the outlet funnel is stiffened, thereby preventing the nozzle from vibrating.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous refinements of the invention result from the subclaims.

Die Erfindung wird nachfolgend anhand eines in den Zeichnungen wiedergebebenen Ausführungsbeispiels erläutert. Darin zeigt:

Figur 1
einen achsparallelen Schnitt durch eine Venturidüse;
Figur 2
eine Draufsicht auf deren Auslaßtrichter in Richtung des Pfeils I; und
Figur 3
eine ähnliche Draufsicht in perspektivischer Darstellung.
The invention is explained below with reference to an embodiment shown in the drawings. It shows:
Figure 1
an axially parallel section through a Venturi nozzle;
Figure 2
a plan view of the outlet funnel in the direction of arrow I; and
Figure 3
a similar top view in perspective.

Die Venturidüse besteht im wesentlichen aus einem konischen Einlaßtrichter 1, einem in entgegengesetzter Richtung kegelstumpfförmigen Auslaßtrichter 2 mit Halteflansch 3 sowie einem zwischen dem Endteil 4 des der Zufuhr von Verbrennungsluft A dienenden Einlaßtrichters 1 einerseits und dem ihm zugewandten Ende 5 des Auslaßtrichters 2 andererseits gebildeten, den Düsenhals der Venturidüse umgebenden Ringspalt 6. Durch diesen strömt das Verbrennungsgas G etwa parallel zur Luft A in die Venturidüse ein. Die Innenwand des Auslaßtrichters 2 ist mit einer Vielzahl keilförmiger Erhebungen 7 versehen, welche auf der Anströmseite 8 spitz oder abgerundet ausgebildet sind. Ihre rückwärtige Fläche 9 auf der Abströmseite ist flach oder abgeschrägt. Auf diese Weise werden in Richtung des Pfeils I vom Brenner oder der Brennkammer her in die Düse zurückschlagende Druckwellen, welche sich üblicherweise längs der Mantelfläche des Abströmtrichters 2 ausbreiten, wirkungsvoll gedämpft. Die spitze oder abgerundete Anströmseite 8 der Erhebungen 7 sorgt dafür, daß der Strömungswiderstand der Venturidüse nur ganz unwesentlich erhöht wird.The Venturi nozzle consists essentially of a conical inlet funnel 1, one in opposite direction frusto-conical outlet funnel 2 with retaining flange 3 and one between the end part 4 of the supply of combustion air A serving Inlet funnel 1 on the one hand and the end 5 of the outlet funnel 2 facing it on the other hand, formed annular gap 6 surrounding the nozzle neck of the Venturi nozzle the combustion gas G flows approximately parallel to the air A into the Venturi nozzle. The Inner wall of the outlet funnel 2 has a plurality of wedge-shaped elevations 7 provided which are pointed or rounded on the inflow side 8. Your rear surface 9 on the downstream side is flat or beveled. In this way are in the direction of arrow I from the burner or the combustion chamber into the nozzle flashback pressure waves, which are usually along the lateral surface of the Spread out funnel 2, effectively damped. The pointed or rounded Upstream side 8 of the elevations 7 ensures that the flow resistance of the Venturi nozzle is increased only slightly.

Die Erhebungen 7 umgeben die Innenseite des Abströmtrichters 2 in mehreren, in Achsrichtung gestaffelten Ringen 7a, 7b, 7c, usw., welche untereinander eine unterschiedliche Anzahl von Erhebungen 7 aufweisen können und entweder in Achsrichtung hintereinander, oder wie in Figur 1 gezeigt, einander überlappend angeordnet sind. Hier stehen die Erhebungen 7 benachbarter Ringe 7a und 7b bzw. 7b und 7c auf Lücke, wodurch die schalldämmende Wirkung noch erhöht wird. Außer der gezeigten Keilform der einzelnen Erhebungen 7 können diese in Abhängigkeit von der zur erwartenden Strömungsgeschwindigkeit der Luft A bzw. des Gemisches M auch eine andere Gestalt aufweisen. Die größte Höhe der einzelnen Erhebungen beträgt nicht mehr als 6% des Düsenradius am offenen Ende 10 des Auslaßtrichters 2. Damit ist sichergestellt, daß der Strömungswiderstand der Düse nur unwesentlich gegenüber einer glatten Düse erhöht wird. Der günstigste Wert der Höhe hängt u.a. vom Öffnungswinkel des Auslaßtrichters 2 ab und nimmt bei größeren Öffnungswinkeln zu. Die in den einzelnen Ringen 7a bzw. 7b usw. angeordneten Erhebungen 7 können auch derart ausgebildet sein, daß ihre Höhe und/oder ihre Breite von der Einlaßseite zur Auslaßseite hin zunimmt. Die Erhebungen 7 können, wie in Figur 1 angedeutet, auf die Innenseite Auslaßtrichters 2 aufgesetzt sein und beim Herstellen der Düse im Gieß- oder Spritzgießverfahren mit erzeugt werden. Oder man prägt im Falle eines dünnwandigen Mantels des Auslaßtrichters 2 die Erhebungen 7, von deren Außenseite her ein, so daß sie nach innen hervorragen. Die gesamte Venturidüse 1, 2 ist außen von einer nicht dargestellten Ringkammer umgeben, aus welcher das Gas G über einen Ringspalt 6 in den Düsenhals einströmt. Eine solche Art der Gaszufuhr ist in DE-OS 19 06 652 beschrieben.The elevations 7 surround the inside of the outflow funnel 2 in several, in Axial direction staggered rings 7a, 7b, 7c, etc., which one another can have different number of surveys 7 and either in Axis direction one behind the other, or as shown in Figure 1, arranged to overlap each other are. Here are the elevations 7 of adjacent rings 7a and 7b or 7b and 7c Gap, which increases the soundproofing effect. Except the one shown Wedge shape of the individual surveys 7, these depending on the expected flow velocity of the air A or the mixture M also one have a different shape. The greatest amount of the individual surveys is no longer than 6% of the nozzle radius at the open end 10 of the outlet funnel 2. This ensures that the flow resistance of the nozzle is only insignificant compared to a smooth nozzle is increased. The cheapest value of the height depends, among other things. from the opening angle of the Exhaust funnel 2 and increases with larger opening angles. The one in the individual Rings 7a or 7b etc. arranged elevations 7 can also be designed such that their height and / or their width increases from the inlet side to the outlet side. The Elevations 7 can, as indicated in FIG. 1, on the inside of outlet funnel 2 be attached and with the manufacture of the nozzle in the casting or injection molding process be generated. Or you emboss in the case of a thin-walled jacket of the outlet funnel 2 the elevations 7, from the outside, so that they protrude inwards. The the entire Venturi nozzle 1, 2 is surrounded on the outside by an annular chamber, not shown, from which the gas G flows through an annular gap 6 into the nozzle neck. Such a kind the gas supply is described in DE-OS 19 06 652.

Claims (10)

  1. Venturi nozzle for mixing gas and combustion air for a gas burner, wherein the inner wall of the outlet funnel (2) of the venturi nozzle has a large number of raised bumps (7), characterized in that the cross-section of the bumps increases from the upstream end (8) towards the downstream end, the upstream end (8) being pointed or rounded.
  2. Venturi nozzle according to Claim 1, characterized in that the downstream end of the bumps (7) has a rearward surface (9) configured as a breakaway edge.
  3. Venturi nozzle according to Claim 1 or Claim 2, characterized in that the bumps (7) are provided in a plurality of rings (7a, 7b, 7c) located one after another in the direction of flow, and the bumps of adjacent rings are disposed in a staggered arrangement.
  4. Venturi nozzle according to Claim 3, characterized in that the bumps (7) of adjacent rings (7a, 7b, 7c) overlap one another in the direction of flow.
  5. Venturi nozzle according to any one of Claims 1 to 4, characterized in that the bumps (7) are wedge-shaped.
  6. Venturi nozzle according to any one of Claims 1 to 5, characterized in that the maximum height of the individual bumps (7) is not more than 6% of the nozzle radius at the open end (10) of the outlet funnel (2).
  7. Venturi nozzle according to any one of Claims 1 to 6, characterized in that the height of the individual bumps (7) increases from the inflow end part (5) of the outlet funnel (2) to its open end (10).
  8. Venturi nozzle according to any one of Claims 1 to 7, characterized in that the width of the individual bumps (7) increases from the inflow end part (5) of the outlet funnel (2) to its open end (10) of the outlet funnel (2) [sic].
  9. Venturi nozzle according to any one of Claims 1 to 8, characterized in that the bumps (7) are stamped into the shell of the outlet funnel (2).
  10. Venturi nozzle according to any one of Claims 1 to 8, characterized in that an annular gap (6) serving as gas intake is formed between the end part (4) of the intake funnel (1) serving as air intake and the facing end (5) of the outlet funnel (2).
EP98118353A 1997-10-01 1998-09-28 Venturi for mixing gas and air for a gas burner Expired - Lifetime EP0907051B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19743464 1997-10-01
DE19743464A DE19743464C1 (en) 1997-10-01 1997-10-01 Venturi nozzle for mixing gas-burner air-gas charge

Publications (2)

Publication Number Publication Date
EP0907051A1 EP0907051A1 (en) 1999-04-07
EP0907051B1 true EP0907051B1 (en) 2002-04-17

Family

ID=7844330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98118353A Expired - Lifetime EP0907051B1 (en) 1997-10-01 1998-09-28 Venturi for mixing gas and air for a gas burner

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EP (1) EP0907051B1 (en)
DE (2) DE19743464C1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070062679A1 (en) * 2005-06-30 2007-03-22 Agee Keith D Heat exchanger with modified diffuser surface
FR2936040B1 (en) 2008-09-18 2010-08-27 Guillot Ind Sa BOILER MIXER
DE102009024269A1 (en) 2009-06-05 2010-12-09 Honeywell Technologies S.A.R.L. Mixing device for a gas burner
DE102010010791A1 (en) 2010-03-09 2011-09-15 Honeywell Technologies Sarl Mixing device for a gas burner
US9746176B2 (en) 2014-06-04 2017-08-29 Lochinvar, Llc Modulating burner with venturi damper
EP3415817B1 (en) 2017-06-14 2020-09-30 Honeywell Technologies Sarl Gas/air mixing device of a gas burner

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1906652A1 (en) * 1969-02-11 1970-08-20 Hans Maile Atmospheric gas burner for any performance with any flame direction, especially horizontal burning
US4872833A (en) * 1988-05-16 1989-10-10 A. O. Smith Corporation Gas burner construction
DE4419345A1 (en) * 1994-06-03 1995-12-07 Buderus Heiztechnik Gmbh Atmospheric gas burner
DE4436021A1 (en) * 1994-06-03 1996-04-11 Buderus Heiztechnik Gmbh Atmospheric gas burner

Also Published As

Publication number Publication date
DE19743464C1 (en) 1998-11-12
DE59803828D1 (en) 2002-05-23
EP0907051A1 (en) 1999-04-07

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