EP3531017B1 - Gas-luft-mischvorrichtung für einen gasbrenner und anordnung mit einer gas-luft-mischvorrichtung und einem gebläse - Google Patents

Gas-luft-mischvorrichtung für einen gasbrenner und anordnung mit einer gas-luft-mischvorrichtung und einem gebläse Download PDF

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Publication number
EP3531017B1
EP3531017B1 EP18158635.5A EP18158635A EP3531017B1 EP 3531017 B1 EP3531017 B1 EP 3531017B1 EP 18158635 A EP18158635 A EP 18158635A EP 3531017 B1 EP3531017 B1 EP 3531017B1
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EP
European Patent Office
Prior art keywords
gas
flow channel
channel wall
mixing device
outlet opening
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EP18158635.5A
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English (en)
French (fr)
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EP3531017A1 (de
Inventor
Libor Kralicek
Ulrich Niemeyer
Andreas Kammerahl
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Garrett Motion SARL
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Honeywell Technologies SARL
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Priority to EP18158635.5A priority Critical patent/EP3531017B1/de
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    • 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
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/007—Mixing tubes, air supply regulation

Definitions

  • the present patent invention relates to a gas/air mixing device for a gas burner.
  • the present patent invention relates further to an assembly comprising such a gas/air mixing device and a fan.
  • EP 3 015 768 A1 discloses an assembly comprising a gas valve, a fan, a gas/air mixing device and a burner door.
  • the gas/air mixing device comprises a mixer housing providing a first inlet opening for air, a second inlet opening for gas and an outlet opening for gas/air mixture.
  • the fan comprises fan housing with a fan plate housing part and a fan impeller housing part.
  • the fan impeller housing part provides an inlet opening for the gas/air mixture.
  • the inlet opening for the gas/air mixture of the fan housing adjoins the outlet opening for gas/air mixture of the mixer housing.
  • JP 2011 185575 A discloses an assembly comprising a fan and a gas/air mixing device.
  • the gas/air mixing comprises a mixer housing providing a first inlet opening for air, a second inlet opening for gas and an outlet opening for gas/air mixture.
  • a mixing unit is positioned within the mixer housing.
  • the mixing unit provides the gas/air mixture by mixing the air entering into the mixer housing through said first inlet opening and the gas entering into the mixer housing through said second inlet opening.
  • the mixing unit comprises a venturi nozzle.
  • a flow channel extends between the mixing unit and the outlet opening of the mixing housing.
  • EP 2 278 224 A2 discloses a gas/air mixing device for a gas burner having a flow channel extending between a mixing unit and an outlet opening, wherein the flow channel has a flow channel wall being contoured in such a way that - seen in flow direction of the gas/air mixture entering into the flow channel - an angle of inflow is first increasing and thereafter decreasing.
  • a novel gas/air mixing device of a gas burner having a decreased flow restriction between the mixing unit and the outlet opening for gas/air mixture.
  • the novel gas/air mixing device can provide an increased gas/air mixture flow.
  • the gas/air mixing device comprises a flow channel having a bent contour and having a turning point, wherein - seen in flow direction of the gas/air mixture - upstream of turning point the flow channel wall is concave arched and downstream of turning point the flow channel wall is convex arched. This allows to decrease the flow restriction between the mixing unit and the outlet opening for gas/air mixture and to increase the gas/air mixture flow in a very beneficial way.
  • a curvature center point of the concave arched section of the bent flow channel wall is positioned on a side of the flow channel wall facing the gas/air mixture flow.
  • a curvature center point of the convex arched section of the bent channel wall is positioned on a side of the flow channel wall turned away from the gas/air mixture flow. This allows to decrease the flow restriction between the mixing unit and the outlet opening for gas/air mixture and to increase the gas/air mixture flow in a very beneficial way.
  • the outlet opening for the gas/air mixture has an outlet opening central point.
  • the turning point of the bent flow channel wall is positioned on or approximately on an opening axis that runs through the outlet opening central point and perpendicular to the plane in which the outlet opening is lying. This allows to decrease the flow restriction between the mixing unit and the outlet opening for gas/air mixture and to increase the gas/air mixture flow in a very beneficial way.
  • the bent flow channel wall may be s shaped or arc tangent shaped or hyperbolic tangent shaped or sinus area shaped.
  • the flow channel wall may be provided by by at least three straight flow channel wall sections approximating the bent contour.
  • the outlet opening for the gas/air mixture has a first outlet opening section turned away from the mixture unit and a second outlet opening section of the facing the mixture unit.
  • Said first opening section is semicircular shaped.
  • Said second opening section is trapezoidal shaped or rectangular shaped. This allows to decrease the flow restriction between the mixing unit and the outlet opening for gas/air mixture and to increase the gas/air mixture flow in a very beneficial way.
  • the assembly according to the present invention comprises a gas/air mixing device and a fan according to claim 12.
  • the present invention relates to a gas/air mixing device of a gas burner.
  • the present invention relates further to an assembly comprising a gas/air mixing device and a fan.
  • Figures 1 , 2 and 3 each show a section through a gas/air mixing device 10 according to the present invention.
  • the gas/air mixing device 10 has a mixer housing 11.
  • the mixer housing 11 of the gas/air mixing device 10 comprises a first inlet opening 12 for air, a second inlet opening (not visible) for gas and an outlet opening 13 for a gas/air mixture.
  • the gas/air mixing device 10 has a mixing unit 14 positioned within the mixer housing 11.
  • the mixing unit 14 provides the gas/air mixture by mixing the air entering into the mixer housing 11 through said first inlet opening 12 and the gas entering into the mixer housing 11 through said second inlet opening (not visible.
  • the mixing unit 14 may comprise at least one venturi nozzle 15. In the shown embodiment the mixing unit 14 comprises multiple venturi nozzles 15 positioned side by side in a row. The mixing unit 14 may comprise other mixing nozzles than venturi nozzles 15.
  • the mixer housing 11 has a flow channel 16 for the gas/air mixture.
  • the flow channel 16 extends between the mixing unit 14 and the outlet opening 13.
  • the gas/air mixture leaving the mixing unit 14 enters into the flow channel 16 in a flow direction FD illustrated in Fig. 3a .
  • the flow direction of the gas/air mixture leaving the mixing unit 14 falls together or is coaxial with the flow direction FD of the gas/air mixture entering into the flow channel 16.
  • the gas/air mixture leaving the mixing unit 14 enters or flows directly into the flow channel 16.
  • the flow channel 16 guides the flow of the gas/air mixture leaving the mixing unit 14 towards the outlet opening 13 of the mixer housing 11.
  • the flow channel 16 has a shape such the gas/air mixture flowing through said flow channel 16 is subject to a flow deflection of 90° or approximately 90°.
  • the flow channel 16 has a flow channel wall 17 being contoured in such a way that - seen in flow direction FD of the gas/air mixture entering into the flow channel 16 - an angle of inflow ⁇ is first increasing and thereafter decreasing.
  • the bent flow channel wall 17 Seen in flow direction FD of the gas/air mixture, upstream of turning point 18 the bent flow channel wall 17 is concave arched and downstream of turning point 18 the bent flow channel wall 17 is convex arched. So, the bent flow channel wall 17 has a flow channel wall section 17a being concave arched and a flow channel wall section 17b being convex arched.
  • the angle of inflow ⁇ is - seen in flow direction FD of the gas/air mixture entering into the flow channel 16 - increasing.
  • the angle of inflow ⁇ is- seen in flow direction FD of the gas/air mixture entering into the flow channel 16 - decreasing.
  • the angle of inflow ⁇ has a maximum value.
  • a curvature center point C1 of the concave arched flow channel wall section 17a of the bent flow channel wall 17 is positioned on a side of the flow channel wall 17 facing the gas/air mixture flow.
  • a curvature center point C2 of the convex arched flow channel wall section 17b of the bent flow channel wall 17 is positioned on a side of the flow channel wall 17 turned away from the gas/air mixture flow.
  • the concave arched flow channel wall section 17b of the bent flow channel wall 17 is defined by a radius of curvature r1.
  • the convex arched flow channel wall section 17b of the bent flow channel wall 17 is defined by a radius of curvature r2.
  • a ratio r1/r2 defined by the radius of curvature r1 of the concave arched section 17a and the radius of curvature r2 of the convex arched section 17b is the following range: 0,8 ⁇ r1/r2 ⁇ 1,2.
  • the ratio r1/r2 is the following range: 0,9 ⁇ r1/r2 ⁇ 1,1.
  • the ratio r1/r2 is the following range: 0,95 ⁇ r1/r2 ⁇ 1,05.
  • the outlet opening 13 for the gas/air mixture of the mixer housing 11 is at least partially circular shaped and has an outlet opening central point P1.
  • the turning point 18 of the bent flow channel wall 17 is positioned on or approximately on an axis 19 that runs through the outlet opening central point P1 and perpendicular to the plane in which the outlet opening 13 is lying.
  • the distance ⁇ x between the turning point 18 of the bent flow channel wall 17 and said axis 19 is 0.
  • the distance ⁇ x between the turning point 18 of the bent flow channel wall 17 and said axis 19 is greater than 0.
  • a ratio ⁇ x/d defined by a distance ⁇ x between the turning point 18 of the bent flow channel wall 17 and the axis 19 and an opening diameter d of the outlet opening 13 is the following range: 0 ⁇ ⁇ x/d ⁇ 0,1.
  • the ratio ⁇ x/d is the following range: 0 ⁇ ⁇ x/d ⁇ 0,07.
  • the ratio ⁇ x/d is the following range: 0 ⁇ ⁇ x/d ⁇ 0,05.
  • the bent flow channel wall 17 may be - seen in a cross section in the flow direction FD of the gas/air mixture entering into the flow channel 16 - s shaped or arc tangent shaped or hyperbolic tangent shaped or sinus area shaped.
  • the flow channel wall 17 may be provided by at least three straight flow channel wall sections 17s approximating the bent contour.
  • Figure 3b shows a flow channel wall 17 in which the bent contour of Fig. 3a is approximated by three straight flow channel wall sections 17s.
  • Figure 3c shows a flow channel wall 17 in which the bent contour of Fig. 3a is approximated by five straight flow channel wall sections 17s. The middle one of the straight flow channel wall sections 17s runs through the turning point 18 and defines the maximum value of the angle of inflow ⁇ .
  • the straight flow channel wall sections 17s positioned upstream of the middle flow channel wall sections 17s as well as the straight flow channel wall sections 17s positioned downstream of the middle flow channel wall sections 17s define all an angle of inflow ⁇ being smaller than the maximum value defined by the middle one of the straight flow channel wall sections 17s.
  • the flow channel wall 17 is preferably an integral element of the mixer housing 11 (see Figures 3 ).
  • the flow channel wall 17 is provided by an insert 25 (see Figures 1 , 2 and 4 ) positioned within the mixer housing 11.
  • the novel gas/air mixing device 10 of a gas burner has a decreased flow restriction between the mixing unit 14 and the outlet opening 13 for gas/air mixture.
  • the novel gas/air mixing device 19 can provide an increased gas/air mix-ture flow.
  • the outlet opening 13 for the gas/air mixture has a first outlet opening section 13a turned away from the mixture unit 14 and a second outlet opening section 13b turned away from the mixture unit 14.
  • Said first outlet opening section 13a is semicircular shaped.
  • Said second opening section 13b is trapezoidal shaped (see Figure 4, 5 ) or rectangular shaped (see Figure 6 ).
  • the trapezoidal shaped or rectangular shaped second opening section 13b of the outlet opening 13 increases the opening area of the outlet opening 13 by the sections A1 shown in Figures 5 and 6 . This provides a further decreased flow restriction between the mixing unit 14 and the outlet opening 13 for gas/air mixture and a further increased gas/air mixture flow.
  • present invention also provides an assembly comprising a gas/air mixing device 10 as described above and a fan 20 (see Figures 1 , 2 and 3 ).
  • the fan 20 comprises a fan housing 21 and a fan impeller 22 positioned with the fan housing 20.
  • Fan housing 21 and mixer housing 11 may be provided by separate elements or by an integral element.
  • the fan housing 21 has an inlet opening 23 for the gas/air mixture.
  • the plane in which the inlet opening 23 of the fan housing 21 is lying runs parallel to the plane in which the outlet opening 13 of the mixer housing 13 is lying. If the fan housing 21 and mixer housing 11 are provided by an integral element, the inlet opening 23 of the fan housing 21 and the outlet opening 13 of the mixer housing 11 are lying in the same plane.
  • the fan impeller 22 has a fan impeller rotation axis 24.
  • the fan impeller rotation axis 24 runs perpendicular the plane in which the inlet opening 23 of the fan housing 21 is lying and perpendicular to the plane in which the outlet opening 13 of the mixer housing 13 is lying.
  • the turning point 18 of the bent flow channel wall 17 of the gas/air mixing device 10 is lying on or approximately on the fan impeller rotation axis 24 and on or approximately on the axis 19.

Claims (14)

  1. Gas-Luft-Mischvorrichtung (10) für einen Gasbrenner, Folgendes aufweisend:
    ein Mischergehäuse (11),
    wobei das Mischergehäuse (11) eine erste Einlassöffnung (12) für Luft umfasst,
    wobei das Mischergehäuse (11) eine zweite Einlassöffnung für Gas umfasst,
    wobei das Mischergehäuse (11) eine Auslassöffnung (13) für ein Gas-Luft-Gemisch umfasst,
    eine Mischeinheit (14), die innerhalb des Mischergehäuses (11) angeordnet ist,
    wobei die Mischeinheit (14) das Gas-Luft-Gemisch durch Mischen der durch die erste Einlassöffnung (12) in das Mischergehäuse (11) eintretenden Luft und des durch die zweite Einlassöffnung in das Mischergehäuse (11) eintretenden Gases bereitstellt,
    einen Strömungskanal (16) für das Gas-Luft-Gemisch,
    wobei sich der Strömungskanal (16) zwischen der Mischeinheit (14) und der Auslassöffnung (13) erstreckt,
    wobei der Strömungskanal (16) eine Strömungskanalwand (17) aufweist, die derart konturiert ist, dass - in Strömungsrichtung des in den Strömungskanal (16) eintretenden Gas-Luft-Gemischs gesehen - ein Einströmungswinkel (α) zunächst zunimmt und anschließend abnimmt, wobei die Strömungskanalwand (17) eine Strömungsumlenkung der Gas-Luft-Gemisch-Strömung vorsieht,
    dadurch gekennzeichnet, dass
    die Strömungskanalwand (17) eine gekrümmte Kontur und einen Wendepunkt (18) aufweist, wobei - in Strömungsrichtung des Gas-Luft-Gemischs gesehen - die Strömungskanalwand (17, 17a) vor dem Wendepunkt (18) konkav gekrümmt ist und die Strömungskanalwand (17, 17b) nach dem Wendepunkt (18) konvex gekrümmt ist.
  2. Gas-Luft-Mischvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass
    ein Krümmungsmittelpunkt (C1) des konkav gekrümmten Abschnitts (17a) der gekrümmten Strömungskanalwand (17) auf einer Seite der Strömungskanalwand (17) angeordnet ist, die der Gas-Luft-Gemisch-Strömung zugewandt ist,
    ein Krümmungsmittelpunkt (C2) des konvex gekrümmten Abschnitts (17b) der gekrümmten Strömungskanalwand (17) auf einer Seite der Strömungskanalwand (17) angeordnet ist, die von der Gas-Luft-Gemisch-Strömung abgewandt ist.
  3. Gas-Luft-Mischvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass
    ein durch einen Krümmungsradius r1 des konkaven gekrümmten Abschnitts (17a) und einen Krümmungsradius r2 des konvex gekrümmten Abschnitts (17b) definiertes Verhältnis r1/r2 im folgenden Bereich 0,8 ≤ r1/r2 ≤ 1,2, vorzugsweise 0,9 ≤ r1/r2 ≤ 1,1, liegt.
  4. Gas-Luft-Mischvorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass das Verhältnis r1/r2=1.
  5. Gas-Luft-Mischvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass
    die Auslassöffnung (13) für das Gas-Luft-Gemisch einen Auslassöffnungsmittelpunkt (P1) aufweist,
    der Wendepunkt (18) der gekrümmten Strömungskanalwand (17) auf oder in etwa auf einer Achse (19) angeordnet ist, die durch den Auslassöffnungsmittelpunkt (P1) und senkrecht zu der Ebene, in der die Auslassöffnung (13) liegt, verläuft.
  6. Gas-Luft-Mischvorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass
    ein durch einen Abstand Δx zwischen dem Wendepunkt (18) der gekrümmten Strömungskanalwand (17) und der Achse (19) und einem Öffnungsdurchmesser d der Auslassöffnung (13) definiertes Verhältnis Δx/d im folgenden Bereich liegt:
    0 ≤ Δx/d ≤ 0,10, vorzugsweise 0 ≤ Δx/d ≤ 0,07.
  7. Gas-Luft-Mischvorrichtung nach einem der Ansprüche 1-6, dadurch gekennzeichnet, dass die gekrümmte Strömungskanalwand (17) s-förmig oder arkustangensförmig oder hyperbeltangensförmig oder sinusflächenförmig ist.
  8. Gas-Luft-Mischvorrichtung nach einem der Ansprüche 1-7, dadurch gekennzeichnet, dass die Strömungskanalwand (17) durch mindestens drei gerade Strömungskanalwandabschnitte (17s) vorgesehen ist, die sich der gekrümmten Kontur annähern.
  9. Gas-Luft-Mischvorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Strömungskanalwand (17) ein integrales Element des Mischergehäuses (11) ist.
  10. Gas-Luft-Mischvorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Strömungskanalwand (17) durch einen innerhalb des Mischergehäuses (11) angeordneten Einsatz (25) vorgesehen ist.
  11. Gas-Luft-Mischvorrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass
    die Auslassöffnung (13) für das Gas-Luft-Gemisch einen ersten Auslassöffnungsabschnitt (13a), der von der Mischeinheit (14) abgewandt ist, und einen zweiten Auslassöffnungsabschnitt (13b), der der Mischeinheit (14) zugewandt ist, aufweist,
    wobei der erste Auslassöffnungsabschnitt (13a) halbkreisförmig ist,
    wobei der zweite Auslassöffnungsabschnitt (13b) trapezförmig oder rechteckig ist.
  12. Anordnung, Folgendes umfassend:
    eine Gas-Luft-Mischvorrichtung (10) nach einem der Ansprüche 1 bis 11,
    ein Gebläse (20),
    wobei das Gebläse (20) ein Gebläsegehäuse (21) umfasst,
    wobei das Gebläse (20) ein mit dem Gebläsegehäuse (21) angeordnetes Gebläselaufrad (22) umfasst,
    wobei das Gebläsegehäuse (21) eine Einlassöffnung (23) für das Gas-Luft-Gemisch umfasst.
  13. Anordnung nach Anspruch 12, dadurch gekennzeichnet, dass
    die Ebene, in der die Einlassöffnung (23) des Gebläsegehäuses (21) liegt, und die Ebene, in der die Auslassöffnung (13) des Mischergehäuses (11) liegt, parallel zueinander verlaufen oder die Einlassöffnung (23) des Gebläsegehäuses (21) und die Auslassöffnung (13) des Mischergehäuses (11) in derselben Ebene liegen.
  14. Anordnung nach Anspruch 12 oder 13, dadurch gekennzeichnet, dass
    das Gebläselaufrad (22) eine Gebläselaufraddrehachse (24) aufweist,
    die Gebläselaufraddrehachse (24) senkrecht zu der Ebene, in der die Einlassöffnung (23) des Gebläsegehäuses (21) liegt, verläuft,
    der Wendepunkt (18) der gekrümmten Strömungskanalwand (17) der Gas-Luft-Mischvorrichtung (10) auf oder in etwa auf der Gebläselaufraddrehachse (24) angeordnet ist.
EP18158635.5A 2018-02-26 2018-02-26 Gas-luft-mischvorrichtung für einen gasbrenner und anordnung mit einer gas-luft-mischvorrichtung und einem gebläse Active EP3531017B1 (de)

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EP18158635.5A EP3531017B1 (de) 2018-02-26 2018-02-26 Gas-luft-mischvorrichtung für einen gasbrenner und anordnung mit einer gas-luft-mischvorrichtung und einem gebläse

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5423675A (en) * 1993-11-08 1995-06-13 Kratsch; Kenneth Burner mixing chamber
DE10349344B3 (de) * 2003-10-23 2005-06-30 Ebm-Papst Landshut Gmbh Gebläse mit Laminar-Element vor der Ansaugöffnung
IT1395189B1 (it) * 2009-07-22 2012-09-05 Ln 2 Srl Socio Unico Dispositivo miscelatore aria-gas, particolarmente per apparecchi bruciatori a pre-miscelazione.
JP5373671B2 (ja) 2010-03-10 2013-12-18 リンナイ株式会社 バーナ用混合器
EP3015768B1 (de) 2014-10-29 2019-02-20 Honeywell Technologies Sarl Anordnung mit einem Gasventil, einem Lüfter, einem Gas-/Luftmischer und einer Brennertür

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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