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WO2006053527A1 - Dispositif de prechauffage d'un combustible liquide - Google Patents

Dispositif de prechauffage d'un combustible liquide Download PDF

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Publication number
WO2006053527A1
WO2006053527A1 PCT/DE2005/002026 DE2005002026W WO2006053527A1 WO 2006053527 A1 WO2006053527 A1 WO 2006053527A1 DE 2005002026 W DE2005002026 W DE 2005002026W WO 2006053527 A1 WO2006053527 A1 WO 2006053527A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
deflecting
heating element
peripheral region
line section
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.)
Ceased
Application number
PCT/DE2005/002026
Other languages
German (de)
English (en)
Inventor
Fabian Schlaus
Sergej Butenko
Matthias Jahn
Mark Geisler
Michael Keppler
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.)
Webasto SE
Original Assignee
Webasto SE
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 Webasto SE filed Critical Webasto SE
Publication of WO2006053527A1 publication Critical patent/WO2006053527A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/14—Details thereof
    • F23K5/20—Preheating devices
    • 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
    • F23D11/44—Preheating devices; Vaporising devices
    • F23D11/441—Vaporising devices incorporated with burners
    • F23D11/448—Vaporising devices incorporated with burners heated by electrical means

Definitions

  • the present invention relates to a device for preheating liquid fuel, in particular flüssi ⁇ gem fuel for a heater, with a fuel line section and an arranged in the fuel line section electrical heating element. Furthermore, the invention relates to a heater, in particular a motor vehicle auxiliary heater and / or a Kraftfahr ⁇ zeugstand carvingêt having the inventive device.
  • the low efficiency of the above-described preheating technique results from the fact that the preheater as a whole is warmed up more or less isothermally. This results in high surface temperatures, which in turn cause high losses (heat radiation, convective cooling by the preheater overflowing combustion air and so on).
  • the object of the present invention is to eliminate or at least significantly reduce the risk of formation of deposits.
  • the inventive device for preheating liquid fuel builds on the generic state of the art in that means for deflecting a fuel flow are provided between an outer peripheral region of the heating element and an inner peripheral region of the fuel line section.
  • the fuel preferably enters at the hotter end of the heating element, and out again at the other, preferably cooler, end of the heating element.
  • the means provided according to the invention for deflecting the fuel flow lead to a positively guided flow between the inlet and the outlet. In this way, dead zones in the flow, remindström capablee and the like are safely avoided, so that the risk of formation of deposits eliminated or zu ⁇ least significantly reduced.
  • the means for redirecting the fuel flow in the can cause significant spiral deflection of fuel.
  • a low flow resistance / pressure drop is achieved when the pitch of the spiral and the cross section of the resulting flow channel are large.
  • the spiral deflection takes place in turns around the fuel pipe section longitudinal axis.
  • the best possible efficiency in terms of heat transfer is achieved when the pitch of the spiral and the cross section of the flow channel formed are small, which leads to the fact that the flow velocity and the heat transfer are large. It follows that a compromise must be chosen between optimum heat transfer and low flow resistance, which meets all requirements.
  • the means for deflecting the fuel flow to comprise at least one spiral spring arranged in an annular gap formed between the outer peripheral region of the heating element and the inner peripheral region of the fuel line section.
  • This spiral spring is preferably a wire spring, which may additionally act as a heat-transmitting element.
  • the spiral spring at least partially connected to an outer peripheral region of the heating element and / or an Innum- receiving region of the fuel line section is.
  • the spring need not necessarily be connected to the heating element along the entire contact line.
  • a thermal connection of the spring increases the efficiency, since in this case the heat input into the liquid fuel can be done to a very large extent on the spring.
  • the means for deflecting the fuel flow comprise at least one external thread provided on the outer peripheral area of the heating element.
  • the bottom of the spiral thread groove forms the outer peripheral region of the heating element, while the spiral web of the thread constitutes the means for redirecting the fuel flow.
  • the means for deflecting the fuel flow may comprise at least one internal thread provided on the inner circumferential region of the fuel line section.
  • the bottom of the spiral thread groove forms the inner peripheral region of the fuel line section, while the spiral thread ridge constitutes the means for deflecting the fuel flow.
  • the means for deflecting the fuel flow are as close as possible sealed to the outer peripheral region of the heating element and the inner peripheral region of the fuel line section, so that a short-circuit current or a bypass in axial direction can be avoided.
  • the means for deflecting the fuel flow form two or more separate flow channels. In this way, the flow resistance or the pressure loss can be further reduced.
  • the at least two of the two or more separate flow channels are substantially parallel to each other.
  • a two- or multi-start thread or a double or multiple wound spring can be used.
  • the fuel line section has a larger outer circumference than other fuel line sections.
  • Such enlargement of the outer circumference makes it possible to use a heating element with a comparatively large effective surface area without producing excessive pressure losses.
  • the device has an inlet opening, which is arranged in the region of the beginning of at least one channel formed by the means for deflecting the fuel flow. This also avoids dead zones, which are unfavorable because of possible deposition of entrained dirt particles, the formation of fuel deposits as a result of a high residence time of the fuel or the clogging and accumulation of air bubbles. For the same reason, it is preferred that the device has an outlet opening which is arranged in the region of the end of the at least one channel formed by the means for deflecting the fuel flow.
  • the outer peripheral region of the heating element is at least partially formed by a sleeve.
  • the heating element surface is not directly overflowed because the sleeve separates the fuel and the actual heating element.
  • the wall thickness of the sleeve is preferably to be kept so low that the heat capacity of the sleeve is smaller than the heat capacity of the fuel in the device.
  • each heater in particular each additional motor vehicle heater and / or each motor vehicle parking heater having the device according to the invention falls within the scope of the appended claims.
  • adjustable pressure loss in the preheater by suitable selection of the cross section and the length of the flow channel or of the flow channels;
  • Figure 1 shows a first embodiment of the invention
  • FIG. 2 shows a second embodiment of the device according to the invention
  • FIG. 3 shows a third embodiment of the device according to the invention.
  • FIG. 4 shows a fourth embodiment of the device according to the invention.
  • FIG. 5 shows a fifth embodiment of the device according to the invention.
  • FIG. 6 shows a sixth embodiment of the device according to the invention.
  • FIG. 7 shows a seventh embodiment of the device according to the invention.
  • FIG. 8 shows an eighth embodiment of the device according to the invention.
  • FIG. 9 shows a schematic representation of an embodiment of the heater according to the invention.
  • FIGS. 1 to 9 identical or similar elements are provided with the same reference numerals.
  • a substantially cylindrical electrical heating element 14 is coaxial in an embodiment.
  • a likewise substantially cylindrical fuel line section 12 is arranged, wherein the only partially illustrated electrical connecting lines are designated by 54.
  • the fuel flow direction is represented by respective arrows, which carry the reference numeral 36 at the inlet or outlet.
  • the respective means 20 to 34 for deflecting the fuel flow 36 cause a substantially spiral deflection of fuel, wherein the spiral deflection takes place in turns around the fuel line section longitudinal axis, as it does is indicated by the respective arrows.
  • the means for deflecting the fuel flow 36 are formed by a spiral spring 20 which is arranged in an annular gap 38 which is formed between the outer peripheral region 16 of the heating element 14 and the inner peripheral region 18 of the fuel conduit section 12 ,
  • the coil spring 20 preferably made of wire is thermally bonded to the electric heating element 14, so that the active heating surface is increased.
  • the means for deflecting the fuel flow 36 are formed by an external thread 22 provided on the outer peripheral region 16 of the heating element 14, which is embossed or cut can be.
  • an optimal efficiency is obtained since the outer surface of the heating element 14 and thus the surface effective for the heat transfer are particularly large.
  • the bottom of the thread groove forms the outer peripheral portion 16 of the heating element 14, while the threaded ridge provides the means for deflecting the fuel flow 36.
  • Vor ⁇ preferably the threaded ridge is under sealing with the inner peripheral portion 18 of the fuel line section 12 in connection.
  • the means for deflecting the fuel flow 36 are formed by an internal thread 24 provided on the inner peripheral region 18 of the fuel line section 12.
  • the bottom of the thread groove forms the inner peripheral region 18 of the fuel line section 12, and the thread ridge constitutes the means for deflecting the fuel flow 36.
  • the thread ridge is preferably under sealing with the outer peripheral region 16 of FIG.
  • Heating element 14 in conjunction.
  • the means for deflecting the fuel flow 36 are formed by a double-wound spiral spring 26, so that two parallel spiral flow passages result.
  • the flow resistance can advantageously be reduced. It is advantageous if the fuel is introduced and discharged along the preheater axis.
  • the means for deflecting the fuel flow 36 are likewise formed by a short spiral spring 28 in this case. 5 shows a preferred arrangement of a Auslass ⁇ réelle 50 in the region of the end of the flow channel formed by the spring 28. Such an outlet opening 50 minimizes dead volumes and the associated disadvantages already explained.
  • FIG. 5 also shows that the outer circumference of the fuel line section 12 is larger than the outer circumference of other fuel line sections 46.
  • the means for deflecting the fuel flow 36 are also formed by a spiral spring, which is provided in this case by the reference numeral 30.
  • FIG. 6 shows a particularly preferred arrangement of the inlet opening 48.
  • the inlet opening 48 is arranged in the region of the beginning of the flow channel formed by the spring 30 in order to avoid adverse dead volumes on the input side.
  • FIG. 6 shows that the fuel feed line 44 also has a smaller cross section than the fuel line section 12.
  • a spiral spring 32 forms the means for deflecting the fuel flow 36, the fuel in this case being supplied in the axial direction, resulting in a very good flow of the annular gap 38.
  • the outer peripheral region 16 of the heating element 14 is formed by a sleeve 52, that is to say the fuel does not come into direct contact with the actual heating element 14.
  • the wall thickness of the sleeve 52 is kept so low that the heat capacity of the sleeve 52 is smaller than the saukapa ⁇ capacity of the fuel in the preheater.
  • a coil spring which is designated 34.
  • FIG. 9 shows a greatly simplified schematic representation of a heating device 100 which has a combustion chamber 110.
  • the combustion chamber 110 is supplied with liquid fuel via a nozzle arrangement 112 of no interest here.
  • the liquid fuel passes via a fuel line section 44 to a device 10 for preheating the liquid fuel.
  • the apparatus 10 may be in accordance with any of the above-discussed embodiments.
  • the preheated fuel passes via a fuel line section 46 to the nozzle arrangement 112. Overall, the preheating of the fuel causes it to be vaporized more easily, which has a positive effect on the combustion behavior.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spray-Type Burners (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

L'invention concerne un dispositif (10) servant à préchauffer un combustible liquide, en particulier un combustible liquide pour un appareil de chauffage (100), ce dispositif (10) comprenant une section de conduite de combustible (12) et un élément chauffant (14) électrique disposé dans cette section de conduite de combustible (12). Selon l'invention, des moyens (20-34) destinés à dévier l'écoulement du combustible (36) sont disposés entre une zone périphérique extérieure (16) de l'élément chauffant (14) et une zone périphérique intérieure (18) de la section de conduite de combustible (12). L'invention concerne en outre un appareil de chauffage (100) comprenant le dispositif selon l'invention.
PCT/DE2005/002026 2004-11-17 2005-11-09 Dispositif de prechauffage d'un combustible liquide Ceased WO2006053527A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410055436 DE102004055436B4 (de) 2004-11-17 2004-11-17 Vorrichtung zur Vorwärmung von flüssigem Brennstoff
DE102004055436.6 2004-11-17

Publications (1)

Publication Number Publication Date
WO2006053527A1 true WO2006053527A1 (fr) 2006-05-26

Family

ID=35781592

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2005/002026 Ceased WO2006053527A1 (fr) 2004-11-17 2005-11-09 Dispositif de prechauffage d'un combustible liquide

Country Status (2)

Country Link
DE (1) DE102004055436B4 (fr)
WO (1) WO2006053527A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021112550A1 (de) 2021-05-14 2022-11-17 Webasto SE Mobile Heizvorrichtung und Verfahren zum Betreiben einer mobilen Heizvorrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB848203A (en) * 1956-06-23 1960-09-14 Frank Wykes Improvements in and relating to liquid fuel burning devices
GB858875A (en) * 1958-08-28 1961-01-18 Frank Wykes Improvements in and connected with liquid fuel burners
US4301966A (en) * 1976-11-12 1981-11-24 Anton Schwarz Oil burner
DE3428484A1 (de) * 1984-08-02 1986-02-13 Triatherm Elektrowärme GmbH, 6053 Obertshausen 2 Elektrischer durchflusserhitzer fuer oelbrenner
US4877395A (en) * 1987-06-22 1989-10-31 Gary Schubach System control means to preheat waste oil for combustion
US6461148B1 (en) * 2000-09-28 2002-10-08 Mcdermott Technology, Inc. Compact, high-temperature, low-flow rate, liquid fuel-fired burner

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2846282C2 (de) * 1977-11-02 1982-08-26 Anton 6020 Innsbruck Schwarz Ölvorwärmeinrichtung für einen Druckzerstäuberbrenner
DE3505206A1 (de) * 1985-02-15 1986-08-21 Robert 8933 Graben Höchtl Vorrichtung zur vorwaermung von dieselkraftstoff
DE3918663A1 (de) * 1989-06-08 1990-12-13 Eberspaecher J Anordnung zur brennstoffvorwaermung fuer einen ultraschallzerstaeuber fuer heizgeraete
AT398620B (de) * 1991-01-16 1995-01-25 Schwarz A & Co Ölvorwärmeeinrichtung für einen druckzerstäuberbrenner
DE19860196C1 (de) * 1998-12-24 2000-01-27 Webasto Thermosysteme Gmbh Fahrzeugheizgerät mit Brennstoffvorerwärmung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB848203A (en) * 1956-06-23 1960-09-14 Frank Wykes Improvements in and relating to liquid fuel burning devices
GB858875A (en) * 1958-08-28 1961-01-18 Frank Wykes Improvements in and connected with liquid fuel burners
US4301966A (en) * 1976-11-12 1981-11-24 Anton Schwarz Oil burner
DE3428484A1 (de) * 1984-08-02 1986-02-13 Triatherm Elektrowärme GmbH, 6053 Obertshausen 2 Elektrischer durchflusserhitzer fuer oelbrenner
US4877395A (en) * 1987-06-22 1989-10-31 Gary Schubach System control means to preheat waste oil for combustion
US6461148B1 (en) * 2000-09-28 2002-10-08 Mcdermott Technology, Inc. Compact, high-temperature, low-flow rate, liquid fuel-fired burner

Also Published As

Publication number Publication date
DE102004055436B4 (de) 2008-04-17
DE102004055436A1 (de) 2006-05-24

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