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EP2491308A1 - Dispositif pour la face aspiration d'une soufflante - Google Patents

Dispositif pour la face aspiration d'une soufflante

Info

Publication number
EP2491308A1
EP2491308A1 EP10740592A EP10740592A EP2491308A1 EP 2491308 A1 EP2491308 A1 EP 2491308A1 EP 10740592 A EP10740592 A EP 10740592A EP 10740592 A EP10740592 A EP 10740592A EP 2491308 A1 EP2491308 A1 EP 2491308A1
Authority
EP
European Patent Office
Prior art keywords
manifold
venturi nozzle
section
flow
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.)
Granted
Application number
EP10740592A
Other languages
German (de)
English (en)
Other versions
EP2491308B1 (fr
Inventor
Roland Keber
Tobias Metz
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.)
Ebm Papst Landshut GmbH
Original Assignee
Ebm Papst Landshut GmbH
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 Ebm Papst Landshut GmbH filed Critical Ebm Papst Landshut GmbH
Publication of EP2491308A1 publication Critical patent/EP2491308A1/fr
Application granted granted Critical
Publication of EP2491308B1 publication Critical patent/EP2491308B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46Details
    • F23D14/62Mixing devices; Mixing tubes

Definitions

  • the invention relates to a device for attachment to the suction side of a blower, in particular a premix blower, and comprises a gas inlet and a gas outlet, wherein the device is designed as a manifold and in the manifold a venturi is integrated.
  • a premix blower blowers without premix function will also be included.
  • premixing blowers for gas burners are usually sucked by a radial fan air and fuel gas, premixed in a blower and blown as a combustible mixture in the burner.
  • valves are used which are either electronically or pneumatically controllable.
  • the gas valve In a pneumatic control, the gas valve is controlled by a pneumatic negative pressure and the gas is mixed directly into the flow of the intake air. Depending on the amount of air sucked in per time, a corresponding admixed gas quantity results. It is known to achieve the negative pressure by means of a Venturi nozzle arranged on the suction side of the premixing blower, in which a locally higher flow velocity and thus a reduced pressure is achieved by means of local flow cross-section reduction (Bernoulli equation).
  • Venturi nozzles must have a certain length compared to their diameter to produce the necessary negative pressure.
  • the ratio between length and diameter is called the aspect ratio.
  • the aspect ratio is usually 1: 5 based on the smallest or about 1: 3 based on the largest cross section of the venturi nozzle.
  • the pre-mixing devices are mounted on the side suction port of the blower, resulting in known structures a considerable size in all directions, which is undesirable. It is therefore an object of the invention to provide a device which improves the known advantages of a pneumatic mixture formation by means of Venturi nozzle such that the required space in the height direction is minimized.
  • a device for the intake side of a premixing blower with an air or gas inlet and a gas or mixture outlet is provided, wherein the device is designed as a manifold and in the manifold a Venturi nozzle is integrated.
  • a manifold is understood to mean a component form which deflects the flow supplied to the downstream bubble, preferably in the radial direction of the fan wheel. By such a deflection, the extension in the height direction, that is kept very low in the axial direction to the impeller, and thus a compact and material-saving unit can be achieved.
  • the fluid When flowing through a Venturi nozzle, the fluid is accelerated to the narrowest cross section and then delayed. In the delay of the flow, the pressure increases, which can lead to a separation of the flow at the edge, the so-called boundary layer separation, which leads to losses. It is therefore known to the person skilled in the art that the Venturi nozzle may not open too much, starting from the narrowest cross-section, whereby as a normal value an opening angle of 10 ° should not be exceeded. However, even with optimal conditions, the flow is lossy over the entire length of the Venturi nozzle.
  • the Venturi nozzle of the bend in the region of the smallest cross-section may be substantially slot-shaped, wherein the slot may extend substantially over the entire width of the Venturi nozzle. Due to the slot-shaped design of the region with a small cross-section of the venturi, a substantially free flow is ensured over the width of the manifold, so that the total loss is extremely low.
  • a supply line can be formed integrally with the device or the manifold, wherein the supply line is substantially tubular and extends at least over the entire width of the manifold.
  • an opening gap is preferably provided, or through-holes formed with a corresponding cross-section are provided in order to enable effective mixing of the gas supplied via the feed line.
  • the gas distribution within the supply line is as homogeneous as possible, so that over the opening gap as constant as possible gas delivery is ensured.
  • the opening gap extends at least over half the width of the Venturi nozzle, but preferably over substantially the entire width in order to ensure the highest possible degree of admixture.
  • the opening gap may be spaced from the position of the smallest cross section of the venturi nozzle at the manifold.
  • such distance should not exceed 10% of the total length of the device or manifold to ensure efficient use of the venturi effect.
  • the device according to the invention is of advantage that from the air inlet to the mixture outlet, a deflection of the flow of preferably 30 ° can take place. Depending on the application, however, a deflection between 30 ° and even up to 180 ° can take place. This is made possible by the formation of the device as a manifold, wherein the sucked air is not sucked as in the prior art axially to the impeller, but essentially from the radial direction and is deflected only at the intake of the blower housing in an axial flow.
  • the flow is already deflected from the air inlet to the area of the smallest cross-section by at least 15 °, preferably into a flow parallel to the fan outer wall.
  • the cross section in the region of the air inlet to the cross section in the narrowest region of the Venturi nozzle have a height to width ratio between 1: 1, 5 and 1: 2, preferably 1: 1, 7. It is also advantageous if the mixture outlet is formed as a substantially circular outlet opening, and a distance between the edge this outlet opening and the area of the smallest cross-section of the elbow highest has 1, 5 times the value of the diameter of the outlet opening.
  • the distance between the center of the outlet opening and the area of least cross-section (B) should be at least 1.5 times the radius of the impeller of the blower used. Greater distances lead to a more lossy flow. An efficient use of the installation space is given above all when the Venturi projects beyond the impeller outer diameter of the respective impeller used by less than 20%.
  • the width of the Venturi nozzle in the intake area substantially or exactly corresponds to the diameter of the outlet opening. This ensures that the flow over the entire length of the device or the bend and over its entire width, without any loss-generating restrictions or constrictions would be provided.
  • a flange may be provided on the supply line, to which a gas line can be fastened.
  • the supply line preferably extends over the entire width of the manifold so as to ensure an admixture of the gas to the air flowing through the Venturi nozzle over the entire width of the manifold. In this way, the fan as homogeneous as possible mixture of air and gas can be supplied via the suction port.
  • 1 is a side sectional view of a device according to the invention on a blower housing
  • 2 is a plan view of the device according to the invention on a blower
  • FIG. 3 is an enlarged view of the device of FIG. 1.
  • Fig. 1 shows the device formed as a manifold 1, mounted on a
  • Blower housing in which an impeller is arranged.
  • the device 1 is substantially twice as wide as high, the height direction forming an axial direction of the impeller and the width direction forming a radial direction of the impeller.
  • a Venturi nozzle is integrated, which is spaced to the suction port of the blower and the mixture outlet 3 of the manifold.
  • the Venturi nozzle has a plurality of flow sections with different cross sections A, B, C, the cross sections A, C being larger than the smallest cross section B of the Venturi nozzle of the bend.
  • the manifold 1 has a very flat shape and the area of the Venturi nozzle with the smallest cross-section B is formed substantially slit-shaped and extends over the entire width B of the manifold 1.
  • the small cross-section B of the manifold 1 is achieved in that its outer surfaces the substantially straight bottom surface extends from both sides.
  • a feed line 4 is formed, which extends substantially tubular over the entire width b of the manifold 1.
  • the supply line 4 extends in the height direction approximately as far as the other components of the manifold 1, in order to achieve a compact unit as possible.
  • an opening gap 5 is provided in the region of the smallest cross section B, which preferably extends over the entire width b of the Venturi nozzle.
  • the feed line 4 is arranged on the manifold 1 such that the opening gap 5 extends exactly along the position of the smallest cross section.
  • the opening gap 5 has a predetermined distance to the position of the smallest cross section, but this distance should not exceed 10% of the total length l of the manifold 1. stride.
  • the device 1 in a plan view, mounted on a blower, shown in cross section.
  • the manifold 1 extends over the length I and has the width b.
  • the air flows into the manifold 1 over the entire width b of the air inlet 2, and is accelerated to the region of the smallest cross-section B.
  • the supply line 4 has a flange 6 to which a gas line can be fastened in order to mix in gas via the supply line 4 and the opening gap 5 of the intake air.
  • the mixture outlet 3 is designed as a circular outlet opening, wherein a distance f between the edge of the outlet opening and the area of the smallest cross-section B substantially has the value of the diameter d of the outlet opening.
  • the distance f can also be made larger, but should never be greater than 1.5 times the diameter d of the outlet opening.
  • the width b of the manifold 1 is slightly larger than the diameter of the outlet opening d, wherein the difference between b and d can already be exhausted in the material thickness of the manifold 1 and thus b and d can also be chosen the same size.
  • the invention is not limited in its execution to the embodiment shown above. Rather, a number of variants are conceivable, which are also within the scope of the invention. For example, it is possible to move the supply line in the direction of the intake or in the direction of the air inlet, as long as the desired admixture of the gas is still guaranteed. Furthermore, it would be possible to form the air inlet of the bend straight and provide only a deflection of the flow in the region of the mixture outlet. In addition to the use of an opening gap shown, it is also possible to provide a plurality of openings, which ensure a gas inlet into the flow within the manifold.

Landscapes

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

Abstract

L'invention concerne un dispositif pour la face d'aspiration d'une soufflante, qui comprend au moins une entrée de gaz et une sortie de gaz, ledit dispositif étant conçu sous forme de collecteur et un tube de Venturi étant intégré dans ledit collecteur.
EP10740592.0A 2009-10-23 2010-07-29 Dispositif pour la face aspiration d'une soufflante Not-in-force EP2491308B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009050562A DE102009050562A1 (de) 2009-10-23 2009-10-23 Vorrichtung für die Ansaugseite eines Gebläses
PCT/EP2010/061001 WO2011047895A1 (fr) 2009-10-23 2010-07-29 Dispositif pour la face aspiration d'une soufflante

Publications (2)

Publication Number Publication Date
EP2491308A1 true EP2491308A1 (fr) 2012-08-29
EP2491308B1 EP2491308B1 (fr) 2017-07-19

Family

ID=43066779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10740592.0A Not-in-force EP2491308B1 (fr) 2009-10-23 2010-07-29 Dispositif pour la face aspiration d'une soufflante

Country Status (4)

Country Link
EP (1) EP2491308B1 (fr)
DE (1) DE102009050562A1 (fr)
NL (1) NL1038321C2 (fr)
WO (1) WO2011047895A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8839815B2 (en) 2011-12-15 2014-09-23 Honeywell International Inc. Gas valve with electronic cycle counter
US9557059B2 (en) 2011-12-15 2017-01-31 Honeywell International Inc Gas valve with communication link
US9835265B2 (en) 2011-12-15 2017-12-05 Honeywell International Inc. Valve with actuator diagnostics
US9846440B2 (en) 2011-12-15 2017-12-19 Honeywell International Inc. Valve controller configured to estimate fuel comsumption
US9851103B2 (en) 2011-12-15 2017-12-26 Honeywell International Inc. Gas valve with overpressure diagnostics
US8947242B2 (en) 2011-12-15 2015-02-03 Honeywell International Inc. Gas valve with valve leakage test
US8905063B2 (en) 2011-12-15 2014-12-09 Honeywell International Inc. Gas valve with fuel rate monitor
US8899264B2 (en) 2011-12-15 2014-12-02 Honeywell International Inc. Gas valve with electronic proof of closure system
US9074770B2 (en) 2011-12-15 2015-07-07 Honeywell International Inc. Gas valve with electronic valve proving system
US9995486B2 (en) 2011-12-15 2018-06-12 Honeywell International Inc. Gas valve with high/low gas pressure detection
US10422531B2 (en) 2012-09-15 2019-09-24 Honeywell International Inc. System and approach for controlling a combustion chamber
US9234661B2 (en) 2012-09-15 2016-01-12 Honeywell International Inc. Burner control system
EP2868970B1 (fr) 2013-10-29 2020-04-22 Honeywell Technologies Sarl Dispositif de régulation
US10024439B2 (en) 2013-12-16 2018-07-17 Honeywell International Inc. Valve over-travel mechanism
US9841122B2 (en) 2014-09-09 2017-12-12 Honeywell International Inc. Gas valve with electronic valve proving system
US9645584B2 (en) 2014-09-17 2017-05-09 Honeywell International Inc. Gas valve with electronic health monitoring
US10503181B2 (en) 2016-01-13 2019-12-10 Honeywell International Inc. Pressure regulator
US10564062B2 (en) 2016-10-19 2020-02-18 Honeywell International Inc. Human-machine interface for gas valve
US11073281B2 (en) 2017-12-29 2021-07-27 Honeywell International Inc. Closed-loop programming and control of a combustion appliance
US10697815B2 (en) 2018-06-09 2020-06-30 Honeywell International Inc. System and methods for mitigating condensation in a sensor module

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Publication number Priority date Publication date Assignee Title
DE19540772A1 (de) * 1995-11-02 1997-05-07 Buderus Heiztechnik Gmbh Atmosphärischer Gasbrenner
DE69604070T2 (de) * 1996-10-03 2000-02-17 Siabs Industry S.R.L., Legnano Vorrichtung zum Zuführen eines Gas/Luft-Gemisches zu einem Brenner, insbesondere für Heizungsanlagen
DE19733769C2 (de) * 1997-08-05 2003-05-22 Dungs Karl Gmbh & Co Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
DE10202702B4 (de) * 2001-01-24 2013-01-10 IfTA Ingenieurbüro für Thermoakustik GmbH Heizgerät mit einem Gehäuse
EP2163820B1 (fr) * 2008-09-16 2016-08-17 Siemens Aktiengesellschaft Brûleur à gaz

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011047895A1 *

Also Published As

Publication number Publication date
WO2011047895A1 (fr) 2011-04-28
EP2491308B1 (fr) 2017-07-19
NL1038321A (nl) 2011-04-26
DE102009050562A1 (de) 2011-04-28
NL1038321C2 (nl) 2012-03-20

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