EP3128233B1 - Mixing arrangement comprising evaporator - Google Patents
Mixing arrangement comprising evaporator Download PDFInfo
- Publication number
- EP3128233B1 EP3128233B1 EP16182129.3A EP16182129A EP3128233B1 EP 3128233 B1 EP3128233 B1 EP 3128233B1 EP 16182129 A EP16182129 A EP 16182129A EP 3128233 B1 EP3128233 B1 EP 3128233B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- air
- arrangement
- mixing
- evaporation
- 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.)
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Links
- 239000000446 fuel Substances 0.000 claims description 188
- 239000000203 mixture Substances 0.000 claims description 77
- 238000001704 evaporation Methods 0.000 claims description 68
- 230000008020 evaporation Effects 0.000 claims description 68
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 description 12
- 230000002093 peripheral effect Effects 0.000 description 11
- 238000009834 vaporization Methods 0.000 description 10
- 230000008016 vaporization Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D5/00—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel
- F23D5/12—Details
- F23D5/18—Preheating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/44—Preheating devices; Vaporising devices
- F23D11/441—Vaporising devices incorporated with burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D3/00—Burners using capillary action
- F23D3/40—Burners using capillary action the capillary action taking place in one or more rigid porous bodies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D5/00—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel
- F23D5/12—Details
- F23D5/123—Inserts promoting evaporation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2700/00—Special arrangements for combustion apparatus using fluent fuel
- F23C2700/02—Combustion apparatus using liquid fuel
- F23C2700/026—Combustion apparatus using liquid fuel with pre-vaporising means
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- 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
- F23D2900/05002—Use of porous members to convert liquid fuel into vapor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/14—Vehicle heating, the heat being derived otherwise than from the propulsion plant
Definitions
- the present invention relates to a mixing arrangement for mixing fuel vapor with air, preferably for a fuel-powered vehicle heater, comprising a fuel vaporisation arrangement for dispensing vaporized fuel on a vaporization side of the fuel vaporisation arrangement, according to the preamble of claim 1.
- a mixer arrangement is known from DE 10 2005 001 900 A1 known.
- the fuel vapor emitted by a fuel evaporation arrangement provided on a bottom wall is mixed with air in a mixing chamber adjoining the evaporation side of the fuel evaporation arrangement, which passes through openings provided in a circumferential wall surrounding the mixing chamber.
- the mixture of air and fuel vapor formed in the mixing chamber is ignited in a hot packed structure following the mixing chamber or by an ignition element located upstream of the mixing chamber.
- Such mixing arrangements known in the art are generally part of a combustion chamber, such as a fuel-powered vehicle heater.
- vaporized fuel is discharged directly into the combustion chamber and mixed with also in the combustion chamber supplied combustion air.
- the air-fuel mixture produced in the combustion chamber is ignited immediately as soon as there is an air-fuel ratio suitable for combustion.
- the EP 1 338 450 A2 discloses a heater for a vehicle having a combustor assembly formed with a peripheral wall and a bottom wall.
- the peripheral wall is lined on its inside with porous evaporator medium. From the bottom wall extends a central approach, the circumferential wall opposite, has slot-like openings. As a result of this, air enters the intermediate space formed between the circumferential wall and the projection and mixes there with the fuel vapor emitted by the porous evaporator medium.
- the EP 0 166 329 A2 discloses an evaporator chamber in which a vaned rotor is provided.
- a fuel supply channel is in the radially outer regions of branches thereof at a short distance in front of a heated peripheral wall open. The fuel thrown onto the heated peripheral wall evaporates on the inner surface of the peripheral wall and is mixed with air introduced into the space surrounded by the peripheral wall.
- a mixing arrangement for mixing fuel vapor with air preferably for a fuel-powered vehicle heater, according to claim 1.
- This comprises a fuel evaporation arrangement for dispensing evaporated fuel at a Abdampfungsseite the fuel vaporization arrangement and one of the fuel evaporation arrangement on the evaporation side at least partially opposite Air-fuel mixing unit for mixing fuel discharged at the evaporation side with air.
- a mixing arrangement it is first ensured that fuel vapor emitted at the evaporation side of the mixing arrangement at least partially reaches the air-fuel mixing unit and is mixed with air therein. In this way, therefore, first in the air-fuel mixing unit for a defined air-fuel ratio are ensured before the air-fuel mixture downstream functional areas, such as a combustion chamber is supplied.
- the air-fuel mixing unit has at least one inflow region leading into the air-fuel mixing unit for supplying air into the air-fuel mixing unit.
- the inflow region can be arranged such that inflowing air flows essentially parallel to the delivery side of the fuel evaporation arrangement.
- a particularly homogeneous mixing of air and fuel vapor can be ensured, in particular, when the evaporation side has a substantially planar evaporation surface, since then air supplied parallel to the evaporation surface can flow uniformly over the entire evaporation surface and can mix with discharged fuel vapor.
- the air-fuel mixing unit has a plurality of guide elements for conducting air and fuel vapor.
- turbulence in the flow field of supplied air and discharged fuel vapor can also be provided in a targeted manner, as a result of which a homogeneous air-fuel mixture can be produced in the air-fuel mixing unit.
- a particularly precise flow guidance of supplied air and discharged fuel vapor is achieved with the plurality of guide elements. As a result, it is possible to ensure a high degree of turbulence and thus a particularly efficient mixing of air and fuel vapor.
- the construction is such that the guide elements are arranged successively around a central area. This makes it possible to direct air through the guide elements from several directions to the central region and thereby provide in the central region for a particularly high degree of turbulence, which ultimately leads to an effective mixing of air with fuel vapor.
- a rotational flow of the air-fuel mixture can be generated around the central region within the air-fuel mixing unit.
- an inflow region is provided between at least two immediately adjacent guide elements, preferably between all immediately adjacent guide elements. This can be taken care of for an overall compact overall design, since the already existing guide elements can be used to provide the inflow.
- the Air-fuel mixing unit is at least partially open to the fuel evaporation arrangement and / or away from the fuel evaporation arrangement.
- the air-fuel mixing unit is open in the central region to the fuel evaporation arrangement and / or away from the fuel evaporation arrangement.
- This construction allows in particular for a plurality of successively arranged around the central region guide elements with an inflow between adjacent guide elements an air inlet in the radial direction relative to a surface normal of a plan Abdampfungs Diagram and a mixture removal from the air-fuel mixing unit substantially in the direction of the surface normal.
- At least one guide element has at least one straight or / and curved flow deflection surface.
- At least two guide elements are formed integrally with each other.
- At least two extend Guide elements into the central region of the air-fuel mixing unit it is preferred if they are integrally formed with each other in the central region. As a result, it can be effectively ensured that air flowing toward the central region and / or flowing fuel vapor is not influenced by any connection points between two guide elements.
- the mixing arrangement has a mixture guiding arrangement for discharging an air-fuel mixture formed in the air-fuel mixing unit away from the air-fuel mixing unit.
- the mixture guide assembly may be integral with or separate from the air-fuel mixing unit.
- the mixture guiding arrangement is like a shell and at least partially widening away from the evaporation side of the fuel evaporation arrangement.
- the regional expansion of the mixture guiding arrangement requires, on the one hand, turbulence-generating speed changes of the flowing air-fuel mixture, which in turn results in a further mixing of air and fuel vapor.
- the density of the air-fuel mixture can be influenced by the regional expansion of the mixture guiding arrangement and adjusted to operating parameters of downstream functional areas, such as a combustion chamber.
- the mixture-guiding arrangement can serve here as an adapter between an outlet region of the air-fuel mixing unit and a larger or smaller inflow region of a downstream functional region in comparison thereto.
- the mixture guiding arrangement can not also have regionally tapered sections.
- a tapered section may be provided, for example, in a connection area between the air-fuel mixing unit and the mixture guiding arrangement. Such a portion may contribute to an increase in the flow velocity of the air-fuel mixture exiting the air-fuel mixing unit and thereby contribute by turbulence to a further mixing of air and fuel vapor.
- a section with a uniform flow cross section may also be provided, for example a cylindrical section.
- the mixture guiding arrangement may be formed with a different shape.
- the mixture guiding arrangement is at least partially conical and / or at least partially convex and / or at least partially concave.
- the mixing arrangement has a housing with a bottom wall and a peripheral wall adjoining the bottom wall, the fuel evaporation arrangement being provided on the bottom wall.
- a compact construction is provided in that a mixture guiding wall of the mixture guiding arrangement is at least partially surrounded by the circumferential wall, wherein an air inflow space is provided between the circumferential wall and the mixture guiding wall.
- air supplied by means of a side channel blower flows along the mixture guide wall, so that the air can be heated at low ambient temperatures before it enters the air-fuel mixing unit.
- the evaporation of fuel in the fuel evaporation arrangement is not impaired by cold air flowing along the evaporation side.
- the fuel evaporation arrangement comprises a liquid fuel from a fuel supply line receiving and by Kapillarn Quretuticasseite transporting porous evaporation body.
- the fuel evaporation arrangement comprises a heating arrangement.
- This may for example be formed spirally and arranged on a side opposite from the evaporation side of the fuel evaporation arrangement side.
- a high thermal conductivity between the heating arrangement and the fuel evaporation arrangement can be provided by a material connection between the fuel evaporation arrangement and the heating arrangement.
- the present invention relates to a vehicle heater comprising a mixing arrangement according to the invention.
- FIG. 1 a generally designated by the reference numeral 10 mixing arrangement.
- the mixing assembly 10 may for example be installed in a fuel-powered vehicle heater and is provided for mixing fuel vapor with air.
- the mixing assembly 10 includes a fuel vaporization assembly 12 for delivering vaporized fuel to an exhaust side 14 of the fuel vaporization assembly 12.
- the vaporization side 14 of the fuel vaporization assembly 12 may be as shown in FIG FIG. 1 shown, a flat Abdampfungs preparation include, the surface normal A in FIG. 1 is shown.
- the surface normal A defines an axial direction in this exemplary embodiment.
- the mixing arrangement 10 may have a housing 16 with a bottom wall 18 and a peripheral wall 20 adjoining the bottom wall 18.
- the fuel evaporation assembly 12 may be positioned on the bottom wall 18 such that the peripheral wall 20 extends substantially parallel to the surface normal A.
- the fuel vaporization assembly 12 may include a liquid fuel from a fuel supply line 22 and conveyed by Kapillarone Angel to Abdampfungsseite 14, porous evaporation body 24.
- the fuel evaporation arrangement 12 can comprise a heating arrangement 13. This may for example be formed spirally and arranged on one of the evaporation side 14 of the fuel evaporation arrangement 12 opposite side.
- a high thermal conductivity between heating arrangement 13 and fuel evaporation arrangement 12 can be provided by a material connection between fuel evaporation arrangement 12 and heating arrangement 13.
- the mixing arrangement 10 further comprises an air-fuel mixing unit 26, arranged at least partially opposite the evaporation evaporation side 12, for mixing fuel discharged at the evaporation side 14 with air.
- an air-fuel mixing unit 26 can first be provided for a defined air-fuel ratio before the air-fuel mixture downstream functional areas, such as a combustion chamber, not shown in Figure 1, is supplied. Since the composition of the exhaust gases released in the combustion process largely depends on the air-fuel ratio, a defined adjustment of the air-fuel ratio ultimately also the composition of the exhaust gases and thus the pollutant content can be controlled.
- the mixing assembly 10 may include a mixture guide assembly 28 having a mixture guide wall 30 for discharging an air-fuel mixture formed in the air-fuel mixing unit 26 away from the air-fuel mixing unit 26.
- the Gemisch operationswandung 30 of the mixture guide assembly 28 is partially surrounded by the peripheral wall 20 of the housing 16 of the mixing assembly 10 in the present embodiment.
- a Luftanströmraum 31st provided over which air, for example by means of a side channel blower, not shown, along a direction of flow S promotes the air-fuel mixing unit 26 and this is supplied via an inflow 32.
- the air-fuel mixing unit 26 In order to be particularly easy to introduce fuel vapor into the air-fuel mixing unit 26 and in order to be able to discharge particularly easily from the air-fuel mixture 26 produced in the air-fuel mixing unit, the air-fuel mixing unit 26, as in Fig. 1 shown to be open to the fuel evaporation assembly 12 and away from it in a central region Z.
- This configuration thus allows an air supply in the air-fuel mixing unit 26 with respect to the surface normal A radially inward to the central region Z in respective, between immediately adjacent guide elements 34 limited flow channels 33 and a mixture discharge from the air-fuel mixing unit 26 in the axial direction A.
- the air-fuel mixing unit 26 comprises a plurality of guide elements 34 for conducting air and / or fuel vapor.
- the flow of both supplied air and discharged fuel vapor can be selectively influenced within the air-fuel mixing unit 26.
- turbulences in the flow field of supplied air and discharged fuel vapor can thereby be provided in a targeted manner, whereby a homogeneous air-fuel mixture in the air-fuel mixing unit 26 can be generated.
- the arrangement of the guide elements 34 in an orthogonal to the surface normal A plane is in the sectional view of Fig. 5 shown.
- This representation corresponds to that represented by the line VV in FIG Fig. 1 indicated section.
- the guide elements 34 are arranged successively about a central region Z, wherein an inflow region 32 and a flow channel 33 for air to the air-fuel mixing unit 26 are respectively defined between two immediately adjacent guide elements 34.
- the guide elements 34 have a concave and a convex flow deflection surface 36a, 36b.
- FIG. 6 An alternatively configured air-fuel mixing unit 126 with alternatively configured guide elements 134 is in Fig. 6 shown.
- Guide elements 134 shown differ from the guide elements 34 according to Fig. 5 by the shape of the flow deflecting surfaces 136a, 136b.
- the inlet angle of inflowing air into the air-fuel mixing unit 126 can be adjusted by the guide elements 134.
- FIG Fig. 7 Another alternatively configured air-fuel mixing unit 226 is shown in FIG Fig. 7 shown. Similar to the guide elements 134 according to Fig. 5 also have the in Fig. 7 shown guide elements 234 of the air-fuel mixing unit 226 each have a convex and a concave flow deflecting surface 236a and 236b. Unlike in the Figures 5 and 6 shown guide elements 134, the guide elements 234 extend into the central region Z and are integrally connected to each other there. In this way, a defined relative positioning of the respective guide elements 234 to each other can be ensured. Because the only connection point in the central area Z, the flow of air and fuel to the central region Z is also not hindered.
- inflow regions 132 and 232 or flow channels 133 and 233 can also be provided between directly adjacent guide elements 134 and 234, respectively.
- inflow regions 132 and 232 or flow channels 133 and 233 can also be provided between directly adjacent guide elements 134 and 234, respectively.
- vanes with straight flow deflecting surfaces may be combined with vanes having a convex and / or a concave flow deflecting surface.
- the mixture guide assembly 28 may, as in Fig. 1 represented shell-like and be formed by the evaporation side 14 of the fuel vaporization 12 away at least partially widening.
- the regional expansion of the mixture guiding arrangement 28 requires, on the one hand, turbulence-generating changes in the velocity of the flowing air-fuel mixture which, in turn, result in further mixing of air and fuel vapor.
- the density of the air-fuel mixture can be influenced by the regional expansion of the mixture guiding arrangement 28 and adapted to operating parameters of downstream functional areas, such as a combustion chamber.
- a mixture guide arrangement 28 designed in this way can serve as an adapter between an outlet region of the air-fuel mixing unit 26 and a larger or smaller inflow region of a downstream functional region compared to this.
- the mixture guiding arrangement may be formed with a different shape. This can, for example, at least partially conically and / or at least partially convex and / or at least partially concave be widening. However, it may also have tapered portions, which lead to an increase in the speed of the flowing air-fuel mixture. This can cause turbulence in the flow field of the air-fuel mixture be generated, which contribute to a further mixing of air and fuel vapor.
- the mixture guide wall 30 of in Fig. 1 shown mixture guiding assembly 28 has, starting from the fuel evaporation assembly 12 has a tapered portion 35.
- the tapered portion 35 is adjoined by two flared portions: a first portion 36 that is closer and flared to the air-fuel mixing unit 26, and a second portion 38 that is further and concave-widening the air-fuel mixing unit 26.
- FIG. 2 An alternative designed mixture guide arrangement 128 is in FIG. 2 shown.
- FIG Fig. 3 Another alternative mixture guide assembly 228 is shown in FIG Fig. 3 shown. Also, the mixture guide wall 230 of the mixture guide assembly 228 according to Fig. 3 has, similar to the embodiment according to Fig. 1 , starting from the fuel evaporation assembly 12 has a tapered portion 235. At this closes, deviating from the in Fig. 1 shown mixture guide assembly 28, a convexly expanding portion 236 at.
- FIG Fig. 4 Another alternative mixture guide assembly 328 is shown in FIG Fig. 4 shown.
- the mixture guide wall 330 of this mixture guide assembly 328 has, similar to the Gemisch operationssan Aunt 28 according to Fig. 1 , starting from the fuel evaporation assembly 12 has a tapered portion 335. At this closes, deviating from the in Fig. 1 shown mixture guide assembly 28, a concave widening portion 336 at.
- FIGS. 1 to 4 shown mixture guide assemblies 28, 128, 228, 328 with the differently designed air-fuel mixing units 26, 126 and 226 of FIGS. 5 to 7 can be combined as desired.
- a convex widening can be understood as a progressive widening, for example as a progressively increasing flow cross-sectional area.
- a concave extension can be understood as a degressive extension, for example as a degressively increasing flow cross-sectional area.
- a conical enlargement can be understood as a constant extension, for example as a constantly increasing flow cross-sectional area.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Air-Conditioning For Vehicles (AREA)
Description
Die vorliegende Erfindung betrifft eine Mischanordnung zur Durchmischung von Kraftstoffdampf mit Luft, vorzugsweise für ein kraftstoffbetriebenes Fahrzeugheizgerät, umfassend eine Kraftstoffverdampfungsanordnung zur Abgabe von verdampftem Kraftstoff an einer Abdampfungsseite der Kraftstoffverdampfungsanordnung, gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a mixing arrangement for mixing fuel vapor with air, preferably for a fuel-powered vehicle heater, comprising a fuel vaporisation arrangement for dispensing vaporized fuel on a vaporization side of the fuel vaporisation arrangement, according to the preamble of claim 1.
Eine Mischeranordnung gemäß dem Oberbegriff des Anspruchs 1 ist aus der
Derartige, aus dem Stand der Technik bekannte Mischanordnungen sind im Allgemeinen Teil einer Brennkammer, etwa eines kraftstoffbetriebenen Fahrzeugheizgeräts. Dabei wird verdampfter Kraftstoff unmittelbar in die Brennkammer abgegeben und mit ebenfalls in die Brennkammer zugeführter Brennluft durchmischt. Bei diesem herkömmlichen Aufbau wird das in der Brennkammer erzeugte Luft-Kraftstoff-Gemisch sofort gezündet, sobald ein für eine Verbrennung geeignetes Luft-Kraftstoff-Verhältnis vorliegt. Dies bedeutet jedoch, dass weder ein definiertes noch ein homogenes Luft-Kraftstoff-Verhältnis hierdurch sichergestellt werden kann. Da aber die Zusammensetzung der von einem Heizgerät abgegebenen Abgase von dem Luft-Kraftstoff-Verhältnis des verbrennenden Luft-Kraftstoff-Gemisches abhängt, kann folglich bei einem derartigen Heizgerät auch nicht der Schadstoffanteil in den Emissionen kontrolliert werden.Such mixing arrangements known in the art are generally part of a combustion chamber, such as a fuel-powered vehicle heater. In this case, vaporized fuel is discharged directly into the combustion chamber and mixed with also in the combustion chamber supplied combustion air. In this conventional structure, the air-fuel mixture produced in the combustion chamber is ignited immediately as soon as there is an air-fuel ratio suitable for combustion. However, this means that neither a defined nor a homogeneous air-fuel ratio can be ensured thereby. Since, however, the composition of the exhaust gases emitted by a heater depends on the air-fuel ratio of the combustible air-fuel mixture, consequently, in such a heater also the pollutant content in the emissions can not be controlled.
Die
Die
Angesichts der aus dem Stand der Technik bekannten Nachteile ist es die Aufgabe der vorliegenden Erfindung, eine Mischanordnung bereitzustellen, mit welcher das Luft-Kraftstoff-Verhältnis definiert einstellbar ist.In view of the disadvantages known from the prior art, it is the object of the present invention to provide a mixing arrangement with which the air-fuel ratio can be set in a defined manner.
Erfindungsgemäß wird diese Aufgabe gelöst durch eine Mischanordnung zur Durchmischung von Kraftstoffdampf mit Luft, vorzugsweise für ein kraftstoffbetriebenes Fahrzeugheizgerät, gemäß Anspruch 1. Diese umfasst eine Kraftstoffverdampfungsanordnung zur Abgabe von verdampftem Kraftstoff an einer Abdampfungsseite der Kraftstoffverdampfungsanordnung sowie eine der Kraftstoffverdampfungsanordnung an der Abdampfungsseite wenigstens teilweise gegenüberliegend angeordnete Luft-Kraftstoff-Mischeinheit zur Durchmischung von an der Abdampfungsseite abgegebenem Kraftstoff mit Luft.According to the invention, this object is achieved by a mixing arrangement for mixing fuel vapor with air, preferably for a fuel-powered vehicle heater, according to claim 1. This comprises a fuel evaporation arrangement for dispensing evaporated fuel at a Abdampfungsseite the fuel vaporization arrangement and one of the fuel evaporation arrangement on the evaporation side at least partially opposite Air-fuel mixing unit for mixing fuel discharged at the evaporation side with air.
Bei einer erfindungsgemäßen Mischanordnung wird zunächst dafür gesorgt, dass an der Abdampfungsseite der Mischanordnung abgegebener Kraftstoffdampf wenigstens teilweise in die Luft-Kraftstoff-Mischeinheit gelangt und in dieser mit Luft durchmischt wird. Hierdurch kann also zunächst in der Luft-Kraftstoff-Mischeinheit für ein definiertes Luft-Kraftstoff-Verhältnis gesorgt werden, bevor das Luft-Kraftstoff-Gemisch nachgeschalteten Funktionsbereichen, etwa einer Brennkammer, zugeführt wird. Durch die definierte Einstellung des Luft-Kraftstoff-Verhältnisses kann letztlich auch die Zusammensetzung der Abgase und somit der Schadstoffanteil eines eine derartige Mischanordnung aufweisenden Heizgerätes präzise eingestellt werden.In a mixing arrangement according to the invention, it is first ensured that fuel vapor emitted at the evaporation side of the mixing arrangement at least partially reaches the air-fuel mixing unit and is mixed with air therein. In this way, therefore, first in the air-fuel mixing unit for a defined air-fuel ratio are ensured before the air-fuel mixture downstream functional areas, such as a combustion chamber is supplied. By the defined adjustment of the air-fuel ratio ultimately the composition of the exhaust gases and thus the pollutant content of such a mixing arrangement having heater can be adjusted precisely.
In Weiterbildung der Erfindung kann vorgesehen sein, dass die Luft-Kraftstoff-Mischeinheit wenigstens einen in die Luft-Kraftstoff-Mischeinheit führenden Einströmbereich zur Zufuhr von Luft in die Luft-Kraftstoff-Mischeinheit aufweist. Der Einströmbereich kann hierbei derart angeordnet sein, dass einströmende Luft im Wesentlichen parallel zu der Abgabeseite der Kraftstoffverdampfungsanordnung strömt. Eine besonders homogene Durchmischung von Luft und Kraftstoffdampf kann insbesondere dann sichergestellt werden, wenn die Abdampfungsseite eine im Wesentlichen plane Abdampfungsfläche aufweist, da dann parallel zu der Abdampfungsfläche zugeführte Luft gleichmäßig über die gesamte Abdampfungsfläche strömen und sich dabei mit abgegebenem Kraftstoffdampf durchmischen kann.In a further development of the invention it can be provided that the air-fuel mixing unit has at least one inflow region leading into the air-fuel mixing unit for supplying air into the air-fuel mixing unit. In this case, the inflow region can be arranged such that inflowing air flows essentially parallel to the delivery side of the fuel evaporation arrangement. A particularly homogeneous mixing of air and fuel vapor can be ensured, in particular, when the evaporation side has a substantially planar evaporation surface, since then air supplied parallel to the evaporation surface can flow uniformly over the entire evaporation surface and can mix with discharged fuel vapor.
Um sowohl die Strömung zugeführter Luft als auch von abgegebenem Kraftstoffdampf gezielt innerhalb der Luft-Kraftstoff-Mischeinheit beeinflussen zu können, weist die Luft-Kraftstoff-Mischeinheit mehrere Leitelemente zum Leiten von Luft und Kraftstoffdampf auf. Hierdurch kann auch gezielt für Verwirbelungen im Strömungsfeld von zugeführter Luft und abgegebenem Kraftstoffdampf gesorgt werden, wodurch eine homogene Luft-Kraftstoff-Mischung in der Luft-Kraftstoff-Mischeinheit erzeugt werden kann. Eine besonders präzise Strömungsführung von zugeführter Luft und abgegebenem Kraftstoffdampf wird mit der Mehrzahl von Leitelementen erlangt. Hierdurch kann für einen hohen Verwirbelungsgrad und dadurch für eine besonders effiziente Durchmischung von Luft und Kraftstoffdampf gesorgt werden.In order to be able to influence both the flow of supplied air and of discharged fuel vapor specifically within the air-fuel mixing unit, the air-fuel mixing unit has a plurality of guide elements for conducting air and fuel vapor. As a result, turbulence in the flow field of supplied air and discharged fuel vapor can also be provided in a targeted manner, as a result of which a homogeneous air-fuel mixture can be produced in the air-fuel mixing unit. A particularly precise flow guidance of supplied air and discharged fuel vapor is achieved with the plurality of guide elements. As a result, it is possible to ensure a high degree of turbulence and thus a particularly efficient mixing of air and fuel vapor.
Dabei ist der Aufbau derart, dass die Leitelemente um einen Zentralbereich aufeinanderfolgend angeordnet sind. Hierdurch ist es möglich, Luft durch die Leitelemente aus mehreren Richtungen zum Zentralbereich hin zu leiten und dadurch im Zentralbereich für einen besonders hohen Verwirbelungsgrad zu sorgen, was letztlich zu einer effektiven Durchmischung von Luft mit Kraftstoffdampf führt. Durch entsprechende Anordnung der jeweiligen Leitelemente kann auch eine rotatorische Strömung des Luft-Kraftstoff-Gemisches um den Zentralbereich innerhalb der Luft-Kraftstoff-Mischeinheit erzeugt werden.In this case, the construction is such that the guide elements are arranged successively around a central area. This makes it possible to direct air through the guide elements from several directions to the central region and thereby provide in the central region for a particularly high degree of turbulence, which ultimately leads to an effective mixing of air with fuel vapor. By appropriate Arrangement of the respective vanes, a rotational flow of the air-fuel mixture can be generated around the central region within the air-fuel mixing unit.
Dabei kann vorgesehen sein, dass zwischen wenigstens zwei unmittelbar benachbarten Leitelementen, vorzugsweise zwischen allen unmittelbar benachbarten Leitelementen, ein Einströmbereich bereitgestellt ist. Hierdurch kann für einen insgesamt kompakten Gesamtaufbau gesorgt werden, da zur Bereitstellung des Einströmbereichs die ohnehin schon vorhandenen Leitelemente genutzt werden können.It can be provided that between at least two immediately adjacent guide elements, preferably between all immediately adjacent guide elements, an inflow region is provided. This can be taken care of for an overall compact overall design, since the already existing guide elements can be used to provide the inflow.
Um an der Abdampfungsseite der Kraftstoffverdampfungsanordnung abgegebenen Kraftstoffdampf besonders einfach in die Luft-Kraftstoff-Mischeinheit einleiten zu können oder/und um in der Luft-Kraftstoff-Mischeinheit erzeugtes Luft-Kraftstoff-Gemisch einfach aus dieser ausleiten zu können, kann vorgesehen sein, dass die Luft-Kraftstoff-Mischeinheit wenigstens bereichsweise zu der Kraftstoffverdampfungsanordnung hin oder/und von der Kraftstoffverdampfungsanordnung weg offen ist. Bevorzugt ist die Luft-Kraftstoff-Mischeinheit im Zentralbereich zu der Kraftstoffverdampfungsanordnung hin oder/und von der Kraftstoffverdampfungsanordnung weg offen. Dieser Aufbau gestattet insbesondere bei einer Mehrzahl von um den Zentralbereich aufeinanderfolgend angeordneten Leitelementen mit einem Einströmbereich zwischen unmittelbar benachbarten Leitelementen eine Lufteinleitung in radialer Richtung bezogen auf eine Flächennormale einer planen Abdampfungsfläche und eine Gemischabführung aus der Luft-Kraftstoff-Mischeinheit im Wesentlichen in Richtung der Flächennormalen.In order to be able to introduce fuel vapor discharged at the evaporation side of the fuel evaporation arrangement into the air-fuel mixing unit in a particularly simple manner and / or to be able to easily discharge air-fuel mixture produced in the air-fuel mixing unit from this, it can be provided that the Air-fuel mixing unit is at least partially open to the fuel evaporation arrangement and / or away from the fuel evaporation arrangement. Preferably, the air-fuel mixing unit is open in the central region to the fuel evaporation arrangement and / or away from the fuel evaporation arrangement. This construction allows in particular for a plurality of successively arranged around the central region guide elements with an inflow between adjacent guide elements an air inlet in the radial direction relative to a surface normal of a plan Abdampfungsfläche and a mixture removal from the air-fuel mixing unit substantially in the direction of the surface normal.
Um eine definierte Strömungsführung innerhalb der Luft-Kraftstoff-Mischanordnung erzielen zu können, kann vorgesehen sein, dass wenigstens ein Leitelement wenigstens eine gerade oder/und gekrümmte Strömungsablenkfläche aufweist.In order to be able to achieve a defined flow guidance within the air-fuel mixing arrangement, it can be provided that at least one guide element has at least one straight or / and curved flow deflection surface.
In Weiterbildung der Erfindung kann vorgesehen sein, dass wenigstens zwei Leitelemente einstückig miteinander ausgebildet sind. Hierdurch kann im Betrieb stets für eine definierte Relativpositionierung der jeweiligen Leitelemente und somit für eine definierte Strömungsführung gesorgt werden. Erstrecken sich wenigstens zwei Leitelemente bis in den Zentralbereich der Luft-Kraftstoff-Mischeinheit, ist es bevorzugt, wenn diese im Zentralbereich einstückig miteinander ausgebildet sind. Hierdurch kann auf wirksame Weise sichergestellt werden, dass zum Zentralbereich hin strömende Luft oder/und strömender Kraftstoffdampf nicht durch etwaige Verbindungsstellen zwischen zwei Leitelementen beeinflusst wird.In a further development of the invention it can be provided that at least two guide elements are formed integrally with each other. As a result, during operation, a defined relative positioning of the respective guide elements and thus a defined flow guidance can always be ensured. At least two extend Guide elements into the central region of the air-fuel mixing unit, it is preferred if they are integrally formed with each other in the central region. As a result, it can be effectively ensured that air flowing toward the central region and / or flowing fuel vapor is not influenced by any connection points between two guide elements.
Um das in der Luft-Kraftstoff-Mischeinheit gebildete Luft-Kraftstoff-Gemisch gezielt nachfolgenden Funktionsbereichen, wie etwa einer Brennkammer, zuführen zu können, weist die Mischanordnung eine Gemischführungsanordnung zum Abführen eines in der Luft-Kraftstoff-Mischeinheit gebildeten Luft-Kraftstoff-Gemisches von der Luft-Kraftstoff-Mischeinheit weg auf. Die Gemischführungsanordnung kann einstückig mit der Luft-Kraftstoff-Mischeinheit oder gesondert von dieser ausgebildet sein.In order to be able to selectively supply the air-fuel mixture formed in the air-fuel mixing unit to subsequent functional areas, such as a combustion chamber, the mixing arrangement has a mixture guiding arrangement for discharging an air-fuel mixture formed in the air-fuel mixing unit away from the air-fuel mixing unit. The mixture guide assembly may be integral with or separate from the air-fuel mixing unit.
Dabei kann vorgesehen sein, dass die Gemischführungsanordnung schalenartig und sich von der Abdampfungsseite der Kraftstoffverdampfungsanordnung weg wenigstens bereichsweise erweiternd ausgebildet ist. Die bereichsweise Erweiterung der Gemischführungsanordnung bedingt einerseits Verwirbelungen erzeugende Geschwindigkeitsänderungen des strömenden Luft-Kraftstoff-Gemisches, die wiederum eine weitere Durchmischung von Luft und Kraftstoffdampf zur Folge haben. Andererseits kann durch die bereichsweise Erweiterung der Gemischführungsanordnung die Dichte des Luft-Kraftstoff-Gemisches beeinflusst und an Betriebsparameter nachgeschalteter Funktionsbereiche, etwa einer Brennkammer, angepasst werden. Darüber hinaus kann die Gemischführungsanordnung hierbei als Adapter zwischen einem Austrittsbereich der Luft-Kraftstoff-Mischeinheit und einem im Vergleich hierzu größeren oder kleineren Einströmbereich eines nachgeschalteten Funktionsbereichs dienen.It can be provided that the mixture guiding arrangement is like a shell and at least partially widening away from the evaporation side of the fuel evaporation arrangement. The regional expansion of the mixture guiding arrangement requires, on the one hand, turbulence-generating speed changes of the flowing air-fuel mixture, which in turn results in a further mixing of air and fuel vapor. On the other hand, the density of the air-fuel mixture can be influenced by the regional expansion of the mixture guiding arrangement and adjusted to operating parameters of downstream functional areas, such as a combustion chamber. In addition, the mixture-guiding arrangement can serve here as an adapter between an outlet region of the air-fuel mixing unit and a larger or smaller inflow region of a downstream functional region in comparison thereto.
Es soll hierdurch jedoch nicht ausgeschlossen werden, dass die Gemischführungsanordnung nicht auch sich bereichsweise verjüngende Abschnitte aufweisen kann. Ein sich verjüngender Abschnitt kann beispielsweise in einem Anschlussbereich zwischen Luft-Kraftstoff-Mischeinheit und Gemischführungsanordnung vorgesehen sein. Ein derartiger Abschnitt kann zu einer Erhöhung der Strömungsgeschwindigkeit des aus der Luft-Kraftstoff-Mischeinheit austretenden Luft-Kraftstoff-Gemisches beitragen und dadurch durch Verwirbelungen zu einer weiteren Durchmischung von Luft und Kraftstoffdampf beitragen. Alternativ zu einem sich verjüngenden Abschnitt im Anschlussbereich von Luft-Kraftstoff-Mischeinheit und Gemischführungsanordnung kann auch ein Abschnitt mit einem gleichmäßigen Strömungsquerschnitt vorgesehen sein, etwa ein zylindrischer Abschnitt.However, it should not be ruled out by this that the mixture guiding arrangement can not also have regionally tapered sections. A tapered section may be provided, for example, in a connection area between the air-fuel mixing unit and the mixture guiding arrangement. Such a portion may contribute to an increase in the flow velocity of the air-fuel mixture exiting the air-fuel mixing unit and thereby contribute by turbulence to a further mixing of air and fuel vapor. As an alternative to a tapering section in the connection area of the air-fuel mixing unit and the mixture guiding arrangement, a section with a uniform flow cross section may also be provided, for example a cylindrical section.
In Abhängigkeit der gewünschten Strömungsgeschwindigkeit in einer von der Luft-Kraftstoff-Mischeinheit wegführenden Richtung, kann die Gemischführungsanordnung mit unterschiedlicher Gestalt ausgebildet sein. Bevorzugt ist die Gemischführungsanordnung wenigstens bereichsweise konisch oder/und wenigstens bereichsweise konvex oder/und wenigstens bereichsweise konkav sich erweiternd ausgebildet.Depending on the desired flow rate in a direction away from the air-fuel mixing unit direction, the mixture guiding arrangement may be formed with a different shape. Preferably, the mixture guiding arrangement is at least partially conical and / or at least partially convex and / or at least partially concave.
Die Mischanordnung weist ein Gehäuse mit einer Bodenwandung und einer sich an die Bodenwandung anschließenden Umfangswandung auf, wobei die Kraftstoffverdampfungsanordnung an der Bodenwandung vorgesehen ist.The mixing arrangement has a housing with a bottom wall and a peripheral wall adjoining the bottom wall, the fuel evaporation arrangement being provided on the bottom wall.
Ein kompakter Aufbau wird dadurch bereitgestellt, dass eine Gemischführungswandung der Gemischführungsanordnung wenigstens teilweise von der Umfangswandung umgeben ist, wobei zwischen Umfangswandung und Gemischführungswandung ein Luftanströmraum vorgesehen ist. Bei dieser Ausgestaltung kann dafür gesorgt werden, dass beispielsweise mittels eines Seitenkanalgebläses herangeförderte Luft entlang der Gemischführungswandung strömt, so dass bei niedrigen Umgebungstemperaturen die Luft erwärmt werden kann, bevor sie in die Luft-Kraftstoff-Mischeinheit eintritt. Hierdurch kann insbesondere dafür gesorgt werden, dass die Verdampfung von Kraftstoff in der Kraftstoffverdampfungsanordnung durch entlang der Abdampfungsseite strömende kalte Luft nicht beeinträchtigt wird.A compact construction is provided in that a mixture guiding wall of the mixture guiding arrangement is at least partially surrounded by the circumferential wall, wherein an air inflow space is provided between the circumferential wall and the mixture guiding wall. In this embodiment, it can be ensured that, for example, air supplied by means of a side channel blower flows along the mixture guide wall, so that the air can be heated at low ambient temperatures before it enters the air-fuel mixing unit. In this way, it can be ensured in particular that the evaporation of fuel in the fuel evaporation arrangement is not impaired by cold air flowing along the evaporation side.
Eine zuverlässige Verdampfung von Kraftstoff, welche zudem weitestgehend unabhängig von der Positionierung der Mischanordnung ist, kann dadurch sichergestellt werden, dass die Kraftstoffverdampfungsanordnung einen flüssigen Kraftstoff aus einer Kraftstoffzufuhrleitung aufnehmenden und durch Kapillarförderwirkung zur Abdampfungsseite transportierenden porösen Verdampfungskörper umfasst.A reliable evaporation of fuel, which is also largely independent of the positioning of the mixing arrangement, can be ensured by the fact that the fuel evaporation arrangement comprises a liquid fuel from a fuel supply line receiving and by Kapillarförderwirkung to Abdampfungsseite transporting porous evaporation body.
Um insbesondere in einer Betriebsstartphase der Mischanordnung oder des Heizgeräts, in welchem die Mischanordnung eingebaut ist, für eine zuverlässige Verdampfung sorgen zu können, kann vorgesehen sein, dass die Kraftstoffverdampfungsanordnung eine Heizanordnung umfasst. Diese kann beispielsweise spiralförmig ausgebildet und an einer von der Abdampfungsseite der Kraftstoffverdampfungsanordnung gegenüberliegenden Seite angeordnet sein. Eine hohe Wärmeleitfähigkeit zwischen Heizanordnung und Kraftstoffverdampfungsanordnung kann durch eine stoffschlüssige Verbindung zwischen Kraftstoffverdampfungsanordnung und Heizanordnung bereitgestellt werden.In order to be able to ensure reliable evaporation, in particular in an operating start phase of the mixing arrangement or of the heating device in which the mixing arrangement is installed, it can be provided that the fuel evaporation arrangement comprises a heating arrangement. This may for example be formed spirally and arranged on a side opposite from the evaporation side of the fuel evaporation arrangement side. A high thermal conductivity between the heating arrangement and the fuel evaporation arrangement can be provided by a material connection between the fuel evaporation arrangement and the heating arrangement.
Die vorliegende Erfindung betrifft in einem weiteren Aspekt ein Fahrzeugheizgerät, umfassend eine erfindungsgemäße Mischanordnung.In a further aspect, the present invention relates to a vehicle heater comprising a mixing arrangement according to the invention.
Die vorliegende Erfindung wird nachfolgend durch Bezugnahme auf die beigefügten Figuren näher erläutert werden. Es zeigt:
- Figur 1
- eine Schnittansicht einer erfindungsgemäßen Mischanordnung,
- Figur 2
- eine Schnittansicht einer erfindungsgemäßen Mischanordnung mit einer abgewandelten Gemischführungsanordnung,
- Figur 3
- eine Schnittansicht einer erfindungsgemäßen Mischanordnung mit einer gegenüber den Mischanordnungen der
Figuren 1 und2 abgewandelten Gemischführungsanordnung, - Figur 4
- eine Schnittansicht einer erfindungsgemäßen Mischanordnung mit einer gegenüber den Mischanordnungen der
Figuren 1 bis 3 abgewandelten Gemischführungsanordnung, - Figur 5
- eine Schnittansicht gemäß der in
Figur 1 gezeigten Linie V-V, - Figur 6
- eine alternative Ausgestaltung des in
Figur 5 gezeigten Bereichs der Mischanordnung und - Figur 7
- eine weitere alternative Ausgestaltung des in
Figur 5 gezeigten Bereichs der Mischanordnung.
- FIG. 1
- a sectional view of a mixing arrangement according to the invention,
- FIG. 2
- a sectional view of a mixing arrangement according to the invention with a modified mixture guiding arrangement,
- FIG. 3
- a sectional view of a mixing arrangement according to the invention with a relation to the mixing arrangements of
FIGS. 1 and2 modified mixture guiding arrangement, - FIG. 4
- a sectional view of a mixing arrangement according to the invention with a relation to the mixing arrangements of
FIGS. 1 to 3 modified mixture guiding arrangement, - FIG. 5
- a sectional view according to the in
FIG. 1 shown line VV, - FIG. 6
- an alternative embodiment of the in
FIG. 5 shown area of the mixing arrangement and - FIG. 7
- another alternative embodiment of in
FIG. 5 shown area of the mixing arrangement.
In
Die Mischanordnung 10 umfasst eine Kraftstoffverdampfungsanordnung 12 zur Abgabe von verdampftem Kraftstoff an einer Abdampfungsseite 14 der Kraftstoffverdampfungsanordnung 12. Die Abdampfungsseite 14 der Kraftstoffverdampfungsanordnung 12 kann, wie in
Die Mischanordnung 10 kann ein Gehäuse 16 mit einer Bodenwandung 18 und einer sich an die Bodenwandung 18 anschließenden Umfangswandung 20 aufweisen. Die Kraftstoffverdampfungsanordnung 12 kann an der Bodenwandung 18 derart positioniert sein, dass sich die Umfangswandung 20 im Wesentlichen parallel zur Flächennormalen A erstreckt.The mixing
Die Kraftstoffverdampfungsanordnung 12 kann einen flüssigen Kraftstoff aus einer Kraftstoffzufuhrleitung 22 aufnehmenden und durch Kapillarförderwirkung zur Abdampfungsseite 14 transportierenden, porösen Verdampfungskörper 24 umfassen.The
Hierdurch kann für eine zuverlässige Verdampfung von Kraftstoff gesorgt werden, welche zudem weitestgehend unabhängig von der Positionierung der Mischanordnung 10 ist.This can provide for a reliable evaporation of fuel, which is also largely independent of the positioning of the mixing
Um insbesondere in einer Betriebsstartphase der Mischanordnung 10 bzw. eines Heizgeräts, in welchem die Mischanordnung 10 eingebaut ist, für eine zuverlässige Verdampfung sorgen zu können, kann die Kraftstoffverdampfungsanordnung 12 eine Heizanordnung 13 umfassen. Diese kann beispielsweise spiralförmig ausgebildet und an einer von der Abdampfungsseite 14 der Kraftstoffverdampfungsanordnung 12 gegenüberliegenden Seite angeordnet sein. Eine hohe Wärmeleitfähigkeit zwischen Heizanordnung 13 und Kraftstoffverdampfungsanordnung 12 kann durch eine stoffschlüssige Verbindung zwischen Kraftstoffverdampfungsanordnung 12 und Heizanordnung 13 bereitgestellt werden.In order to be able to ensure reliable evaporation, in particular in an operating start phase of the mixing
Die Mischanordnung 10 umfasst zudem eine der Kraftstoffverdampfungsanordnung 12 an der Abdampfungsseite 14 wenigstens teilweise gegenüberliegend angeordnete Luft-Kraftstoff-Mischeinheit 26 zur Durchmischung von an der Abdampfungsseite 14 abgegebenem Kraftstoff mit Luft. Mit einer derartigen Luft-Kraftstoff-Mischeinheit 26 kann zunächst für ein definiertes Luft-Kraftstoff-Verhältnis gesorgt werden, bevor das Luft-Kraftstoff-Gemisch nachgeschalteten Funktionsbereichen, wie etwa einer in Figur 1 nicht dargestellten Brennkammer, zugeführt wird. Da die Zusammensetzung der im Verbrennungsprozess freigesetzten Abgase maßgeblich von dem Luft-Kraftstoff-Verhältnis abhängt, kann durch eine definierte Einstellung des Luft-Kraftstoff-Verhältnisses letztlich auch die Zusammensetzung der Abgase und somit auch der Schadstoffanteil kontrolliert werden.The mixing
Wie in
Um Kraftstoffdampf besonders einfach in die Luft-Kraftstoff-Mischeinheit 26 einführen zu können und um in der Luft-Kraftstoff-Mischeinheit 26 erzeugtes Luft-Kraftstoff-Gemisch besonders einfach aus dieser abführen zu können, kann die Luft-Kraftstoff-Mischeinheit 26, wie in
In der in
Die Anordnung der Leitelemente 34 in einer zu der Flächennormalen A orthogonalen Ebene ist in der Schnittdarstellung der
Eine alternativ ausgestaltete Luft-Kraftstoff-Mischeinheit 126 mit alternativ ausgestalteten Leitelemente 134 ist in
Eine weitere, alternativ ausgestaltete Luft-Kraftstoff-Mischeinheit 226 ist in
Zu den Luft-Kraftstoff-Mischeinheiten 126 und 226 sei noch angemerkt, dass auch bei ihnen zwischen unmittelbar benachbarten Leitelementen 134 bzw. 234 Einströmbereiche 132 bzw. 232 bzw. Strömungskanäle 133 bzw. 233 vorgesehen sein können. Im Übrigen sei darauf hingewiesen, dass in einer Luft-Kraftstoff-Mischeinheit nicht alle Leitelemente identisch sein müssen. Beispielsweise können in einer Luft-Kraftstoff-Mischeinheit Leitelemente mit geraden Strömungsablenkflächen mit Leitelementen mit einer konvexen oder/und einer konkaven Strömungsablenkfläche kombiniert werden.It should also be noted for the air-
Die Gemischführungsanordnung 28 kann, wie in
Die Gemischführungsanordnung kann mit unterschiedlicher Gestalt ausgebildet sein. Diese kann beispielsweise wenigstens bereichsweise konisch oder/und wenigstens bereichsweise konvex oder/und wenigstens bereichsweise konkav sich erweiternd ausgebildet sein. Sie kann jedoch auch sich verjüngende Abschnitte aufweisen, welche zu einer Geschwindigkeitszunahme des strömenden Luft-Kraftstoff-Gemisches führen. Hierdurch können Verwirbelungen im Strömungsfeld des Luft-Kraftstoff-Gemisches erzeugt werden, welche zu einer weiteren Durchmischung von Luft und Kraftstoffdampf beitragen.The mixture guiding arrangement may be formed with a different shape. This can, for example, at least partially conically and / or at least partially convex and / or at least partially concave be widening. However, it may also have tapered portions, which lead to an increase in the speed of the flowing air-fuel mixture. This can cause turbulence in the flow field of the air-fuel mixture be generated, which contribute to a further mixing of air and fuel vapor.
Die Gemischführungswandung 30 der in
Eine alternativ ausgestaltete Gemischführungsanordnung 128 ist in
Eine weitere alternative Gemischführungsanordnung 228 ist in
Eine weitere alternative Gemischführungsanordnung 328 ist in
Angemerkt sei noch, dass die in den
Im Zusammenhang mit der vorangehend beschriebenen Gemischführungsanordnung kann im Sinne der vorliegenden Erfindung eine konvexe Erweiterung als eine progressive Erweiterung, beispielsweise als eine progressiv zunehmende Strömungsquerschnittsfläche, verstanden werden. Eine konkave Erweiterung kann als eine degressive Erweiterung, beispielsweise als eine degressiv zunehmende Strömungsquerschnittsfläche, verstanden werden. Eine konische Erweiterung kann als eine konstante Erweiterung, beispielsweise als eine konstant zunehmende Strömungsquerschnittsfläche, verstanden werden.For the purposes of the present invention, in connection with the previously described mixture-guiding arrangement, a convex widening can be understood as a progressive widening, for example as a progressively increasing flow cross-sectional area. A concave extension can be understood as a degressive extension, for example as a degressively increasing flow cross-sectional area. A conical enlargement can be understood as a constant extension, for example as a constantly increasing flow cross-sectional area.
Claims (11)
- Mixing arrangement (10) for mixing fuel vapour with air, preferably for a fuel-driven vehicle heating device, comprising a housing (16) with a bottom wall (18) and a circumferential wall (20) adjoining the bottom wall (18), and a fuel evaporation arrangement (12) provided at the bottom wall (18) for discharging evaporated fuel at an evaporation side (14) of the fuel evaporation arrangement, wherein an air-fuel mixing unit (26; 126; 226), arranged at least partially opposite the fuel evaporation arrangement (12) at the evaporation side (14) is provided for mixing fuel discharged at the evaporation side (14) with air, wherein the air-fuel mixing unit (26; 126; 226) comprises a plurality of guiding elements (34, 34'; 134; 234) arranged successively around a central region (Z) for guiding air and fuel vapor, and wherein a mixture guide arrangement (28; 128; 238; 338) for discharging an air-fuel mixture formed in the air-fuel mixing unit (26; 126; 226) away from the air-fuel mixing unit (26; 126; 226) is provided, wherein a mixture guide wall (30; 130; 230; 330) of the mixture guide arrangement (28; 128; 228; 328) is at least partially surrounded by the circumferential wall (20), wherein an air inflow space (31) is provided between the circumferential wall (20) and the mixture guide wall (30; 130; 230; 330).
- Mixing arrangement (10) according to claim 1,
characterized in that the air-fuel mixing unit (26; 126; 226) comprises at least one inflow region (32; 132; 232) leading into the air-fuel mixing unit (26; 126; 226) for supplying air into the air-fuel mixing unit (26; 126; 226). - Mixing arrangement (10) according to claim 1 or 2,
characterized in that an inflow region (32; 132; 232) is provided between at least two directly adjacent guiding elements (34, 34'; 134; 234), preferably between all directly adjacent guiding elements (34, 34'; 134; 234). - Mixing arrangement (10) according to one of the preceding claims,
characterized in that the air-fuel mixing unit (26; 126; 226) is open at least in regions towards the fuel evaporation arrangement (12) and/or away from the fuel evaporation arrangement (12). - Mixing arrangement (10) according to one of the preceding claims,
characterized in that at least one guide element (34, 34'; 134; 234) comprises at least one straight flow deflection surface (136a, 136b) or/and curved flow deflection surface (36a, 36b; 236a, 236b). - Mixing arrangement (10) according to one of the preceding claims,
characterized in that at least two guiding elements (234), preferably in the central region (Z) of the air-fuel mixing unit (226), are formed in one piece with one another. - Mixing arrangement (10) according to one of the preceding claims,
characterized in that the mixture guide arrangement (28; 128; 228; 328) is of shell-like design and is adapted at least partially enlarging away from the evaporation side (14) of the fuel evaporation arrangement (12). - Mixing arrangement (10) according to claim 7,
characterized in that the mixture guide arrangement (28; 128; 30; 228; 328) is adapted at least partially enlarging in a conical or/and convex or/and concave manner. - Mixing arrangement (10) according to one of the preceding claims,
characterized in that the fuel evaporation arrangement (12) comprises a porous evaporation body (24) receiving a liquid fuel from a fuel supply line (22) and transporting it to the evaporation side by capillary conveying action. - Mixing arrangement (10) according to one of the preceding claims, characterized in that the fuel evaporation arrangement (12) comprises a heating arrangement (13).
- Vehicle heating device comprising a mixing arrangement (10) according to one of the preceding claims.
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DE102015112932.9A DE102015112932A1 (en) | 2015-08-06 | 2015-08-06 | mixing arrangement |
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DE102020106881A1 (en) | 2020-03-13 | 2021-09-16 | Eberspächer Climate Control Systems GmbH | Combustion chamber assembly for a fuel-operated vehicle heater |
DE102020007182A1 (en) * | 2020-11-24 | 2022-05-25 | Truma Gerätetechnik GmbH & Co. KG | burner unit |
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DE10207953B4 (en) * | 2002-02-25 | 2005-05-25 | J. Eberspächer GmbH & Co. KG | Heater, in particular for a vehicle |
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2015
- 2015-08-06 DE DE102015112932.9A patent/DE102015112932A1/en not_active Withdrawn
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2016
- 2016-08-01 EP EP16182129.3A patent/EP3128233B1/en active Active
Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
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EP3128233A1 (en) | 2017-02-08 |
DE102015112932A1 (en) | 2017-02-09 |
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