EP1239221B1 - Dispositif d'alimentation en carburant pour système de chauffage mobile - Google Patents

Dispositif d'alimentation en carburant pour système de chauffage mobile Download PDF

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Publication number
EP1239221B1
EP1239221B1 EP02004609A EP02004609A EP1239221B1 EP 1239221 B1 EP1239221 B1 EP 1239221B1 EP 02004609 A EP02004609 A EP 02004609A EP 02004609 A EP02004609 A EP 02004609A EP 1239221 B1 EP1239221 B1 EP 1239221B1
Authority
EP
European Patent Office
Prior art keywords
fuel
piston
supply apparatus
fuel supply
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP02004609A
Other languages
German (de)
English (en)
Other versions
EP1239221A2 (fr
EP1239221B8 (fr
EP1239221A3 (fr
Inventor
Andreas Huber
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 Thermosysteme GmbH
Webasto Thermosysteme International GmbH
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Filing date
Publication date
Application filed by Webasto Thermosysteme GmbH, Webasto Thermosysteme International GmbH filed Critical Webasto Thermosysteme GmbH
Publication of EP1239221A2 publication Critical patent/EP1239221A2/fr
Publication of EP1239221A3 publication Critical patent/EP1239221A3/fr
Publication of EP1239221B1 publication Critical patent/EP1239221B1/fr
Application granted granted Critical
Publication of EP1239221B8 publication Critical patent/EP1239221B8/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • F23K5/142—Fuel pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/04—Piston machines or pumps characterised by having positively-driven valving in which the valving is performed by pistons and cylinders coacting to open and close intake or outlet ports

Definitions

  • the invention relates to a fuel supply device for a mobile heater, especially for use in a motor vehicle, the fuel in the operation of the heater to a burner promotes. Furthermore, the invention relates to a motor vehicle with a heater and such a fuel supply device.
  • a mobile heater is called a so-called additional air heater or auxiliary water heater in motor vehicles, such as passenger cars, commercial vehicles, Buses or ships. It is usually used for heating a passenger compartment or for preheating the cooling water of an internal combustion engine.
  • a fuel-operated heater in particular a Vehicle Heater With Atmospheric Vaporization Burner, Known At a trained as a suction metering pump fuel through a Suction line sucks from a fuel tank and through a pressure line the Evaporating burner feeds. In the pressure line is immediately in front of the evaporation burner arranged a check valve, which is a Leerdampfen the Prevents pressure line.
  • Suction pumps of such shape allow the burner of the heater Fuel with high dosing accuracy can be supplied.
  • the disadvantage is on the other hand, that a separate suction line be provided for the suction pump must be out of the tank or at another suitable location of the rest pressure-free fuel line system of the motor vehicle leads to the suction pump.
  • the installation of such a suction line is particularly when retrofitting a Heater elaborate.
  • From DE-A 200 19 406 is generally an electromagnetic metering piston pump known, which in particular for the promotion of liquid fuel to a independent heating unit of a motor vehicle is provided.
  • the metering piston pump is equipped with a single-acting anchor, among others for reducing a strong pressure pulsation of the transported liquid at its Head end face and on an outer peripheral surface of the anchor head in the Direction of an outlet housing is designed funnel-shaped.
  • the fuel is relatively high in engines high pressures, for example, supplied with up to 8 bar. These pressures allow new techniques of fuel injection, such as the common Rail system or timed single pump systems (pump-nozzle unit and Pump-line-nozzle).
  • the invention is based on the object, a fuel supply for a Heater of the type mentioned above to improve so that the above Disadvantages are overcome and this is designed in particular less expensive.
  • This object is inventively with a fuel supply to the Characteristics of claim 1 solved.
  • the object is further according to claim 9 solved with a vehicle in which such a heater with an inventive Fuel supply is installed.
  • the basic idea of the invention is that it is true for previously known metering pumps it is imperative that the input side only has a very low pre-pressure, but that a metering device can be designed that a highly accurate dosage also guaranteed with an input side relatively high form.
  • the metering device is relatively inexpensive trained and also has a lower energy consumption.
  • the metering device has a piston which is located in a cylinder is mounted so displaceable that at one end of the piston a first Chamber of variable volume is formed by the pre-printing section the fuel line fuel can be supplied under admission pressure.
  • the fuel has entered the chamber by moving the piston in Promoted direction to the burner in the final pressure section of the fuel line.
  • the pressure of the fuel is thereby, at least slightly, further increased.
  • the fuel is metered into the burner in a particularly simple manner fed. In other words, the fuel is, so to speak, portioned to Burner promoted.
  • both the first chamber and the second are Chamber connected to the pre-pressure section and to the final pressure section, so that in a reciprocating the piston alternately fuel in the final pressure section is promoted.
  • the form section and / or End pressure section branch each within the metering device in two with the respective chambers communicating lines.
  • the combustion air supply device can be used particularly advantageously when its metering device to a pre-pressure of 2 to 10 bar, in particular from 5 to 8 bar, is tuned.
  • This form can be from a Supply line, a return line or a fuel chamber provided be in the means of an in-vehicle or a non-vehicle fuel pump Pressure is built up.
  • the fuel pump does not need fuel dosing, as do conventional dosing pumps, but only needs to provide the form. Dosing of fuel for the burner of Heater is carried out according to the invention by means of the metering device.
  • Such a further developed metering device has particularly advantageous on the second End of the piston on a second chamber, which also bounded by the cylinder is and the fuel can be supplied under pre-pressure.
  • the piston the metering device is thus at its two ends with under standing form Fuel loaded, thus far an equilibrium of forces on the piston is made. If the piston is to be moved now, it must be driven by the Unit only required to increase the pre-pressure to the final pressure Force are generated.
  • the fuel supply device is also particularly cost-effective produce by at least one follower valve is provided by means of the first chamber connected to the pre-pressure section of the fuel line is and is closed by moving the piston.
  • a follow-up valve can be formed in a simple manner by a follow-up opening, i.e. a radial bore, the basic position of the piston, a wall of the cylinder penetrated before one end of the piston. Will the piston out of his Rest position postponed so he moves over the overflow opening and closes it in order to. Upon further displacement of the piston is then in the first chamber initially trapped fuel ejected from this and the Burner supplied.
  • the follower valve may be referred to as a so-called central valve be designed in the piston itself.
  • the first chamber formed on the metering device is particularly advantageous with a check valve provided with spring, by means of which the first chamber is connected to the final pressure section of the fuel line.
  • This Check valve prevents leakage of fuel from the first chamber. Fuel under pre-pressure can not therefore by itself by the metering device pass through, as for example in the electromagnetically operated Pump according to DE 42 43 866 A1 may occur. Furthermore, at the According to the invention further developed fuel supply to a check valve be omitted, as described in DE 195 45 677 A1.
  • the check valve is designed to be Opening pressure is slightly above the inlet pressure in the supply line. This allows the metering device to be placed directly on the burner can be.
  • the dosage of the fuel is particularly accurate and in this case It is a particularly space-saving solution found. Because the conduction path of Endyakabitess the fuel line at the same time relatively short is designed, the burner can after switching off the metering very be re-fueled quickly.
  • the piston which in the present invention further developed metering device is provided, is actuated particularly advantageously by means of a magnetic coil.
  • This can be powered by electric current, either over time is fixed or the taking into account other factors For example, by means of a control unit can be changed.
  • a metering device 10 shown in FIG. 1 has a housing block 12, in which a circular cylindrical cavity 14 is formed, based on Fig.1 along a horizontal axis 16 extends.
  • the housing block 12 forms with the cavity 14 a cylinder in which a circular cylindrical piston 18th is mounted displaceably displaceable.
  • the piston 18 divides the cavity 14 into a first chamber 20, based on Fig.1 at the left end of the piston 18th located, and a second chamber 22, with reference to Figure 1 on the right End of the piston 18 is located.
  • the metering device 10 performs a fuel line 24 therethrough. This is through the first chamber 20 in a pre-pressure section 26 and a End pressure section 28 divided.
  • the pre-pressure section 26 is through a conduit 26A, which extends radially to the axis 16 through the housing block 12 and opens at a follow-up opening 30 in the first chamber 20.
  • a Pressure relief line 31 leads from said bore through the Housing block 12 and opens in the form of a line 26 B in the second chamber 22.
  • the Enyakabêt 28 is designed by means of a line 28 A, which is also extends radially to the axis 16 and in relation to Fig.1 extreme left End region of the cavity 14 leads out of this.
  • the pre-pressure section 26 is fuel under pre-pressure from a not represented chamber of a fuel line system of a Internal combustion engine supplied. This can be done for example by means of a relatively inaccurately conveying pump, such as an oscillating piston pump, happen.
  • the final pressure section 28 is connected to a burner, not shown, with a Fuel-operated heater connected by means of, for example Preheated coolant of said internal combustion engine and an interior an associated vehicle can be heated.
  • a check valve 32 is arranged, which in the closed state, the first chamber 20 closes liquid-tight.
  • the Check valve 32 has a valve plate 34 which by a spring 36 against a valve seat 38 is pressed.
  • the piston 18 is held displaceably by means of a tension spring 40, which in the second chamber 22 and arranged on the end wall of the cavity fourteenth is attached.
  • the piston 18 is further surrounded radially by a magnetic coil 42, which is embedded in the housing block 12 and by its changing Excitation of the piston 18 can be placed in an oscillating motion.
  • the follow-up opening 30 acts as a follow-up valve, which is an afterflow allows fuel only when the piston 18 at least in essentially located in its basic position shown in Fig.1. Will now the Dosing device 10 in function, so the piston 18 by means of Magnet coil 42 along the axis 16 in the direction of the first chamber 20th postponed. The first chamber 20 facing the end of the piston 18th passes over the trailing opening 30, which is thereby closed.
  • the pressure of the outflowing fuel is due to the back pressure of the spring 36th determined on the check valve 32.
  • the discharged quantity becomes, as the fuel is essentially incompressible, determined by the stroke of the piston 18. If necessary, this hub by a corresponding control of Magnetic coil 42 changed according to the currently existing form become.
  • measuring devices can be provided, by means of which the Form and / or the end pressure is determined.
  • FIG. 2 shows an exemplary embodiment of a metering device 10 in which the Piston 18 is designed as a double-acting piston.
  • the first chamber 20 and a at this arranged check valve 32 formed and via a line 26A to the Form pressure section 26 and via a line 28A to the final pressure section 28th the fuel line 24 connected.
  • the second chamber 22 in this embodiment is both with the form pressure section 26 via a line 26 B and with the End pressure section 28 connected via a line 28B.
  • a check valve 32 is arranged, which like the check valve 32 is formed on the first chamber 20.
  • the first and second Chamber 20 and 22 leading lines 28 A and 28 B are in one End pressure section 28 of the fuel line summarized. So are the in the first chamber 20 and the second chamber 22 in leading lines 26A and 26B in the metering device 10 in a pre-printing section 26 summarized
  • the connections of the second chamber 22 to the form and the final pressure section 26 or 28 of the fuel line 24 are corresponding designed on the first chamber 20.
  • the connection of the Voryakabterrorisms 26 at the second chamber 22 by means of a follow-up opening 30 designed as a follow-up valve.
  • the piston 18 is at its two ends by a respective compression spring 44th biased, which are arranged in the chambers 20 and 22 respectively and to the Support valve seats 38 of the respective check valves 32.
  • the piston 18 During operation of the metering device 10 according to the embodiment of FIG the piston 18 from the basic position shown in Figure 2 by means of Magnet coil 42 first in one and then in the opposite Direction along the axis 16 shifted.
  • the magnetic coil 42 has two Windings not shown, which can be controlled separately.
  • the piston 18 performs two strokes, in each of which fuel for a the first chamber 20 and the other from the second chamber 22 through the respective check valve 32 under final pressure in the final pressure section 28th moved and thus metered the said burner is supplied.
  • the Dosing device 10 according to this embodiment particularly low Pressure fluctuations in the final pressure section 28 of the fuel line 24. This leads to a quantitatively precise dosage of the fuel.
  • the check valve or valves 32 fulfill a dual function. They limit or on the one hand control the final pressure, with the fuel from the Dosing device 10 is conveyed out, on the other hand it locks or lock they take off the fuel line 24 while no fuel is being delivered. Thereby emptying or vaporizing the fuel line 24 is reliably prevented. The required for heaters "zero closure" of the fuel line 24 is thus guaranteed.
  • a check valve, as in the heater according to DE 195 45 677 A1 is not in the illustrated embodiments needed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Feeding And Controlling Fuel (AREA)

Claims (9)

  1. Dispositif d'alimentation de carburant pour appareil de chauffage mobile, en particulier pour une utilisation dans un véhicule, qui transporte du carburant vers un brûleur lors du fonctionnement d'un appareil de chauffage, le dispositif d'alimentation du carburant comportant au moins une chambre (20, 22) dans laquelle une conduite de carburant (24) pourvue d'une section de pression en amont (26) débouche, et hors de laquelle une conduite (28A, 28B) pourvue d'une section de pression finale (28) débouche, et sur lequel est installé entre la section de pression en amont (26) et la section de pression finale (28) un dispositif de dosage (10) comportant un piston (18) mobile au moyen duquel le carburant est immédiatement amené à la pression finale requise par le brûleur, dans lequel le piston (18) est disposé de manière décalable dans un cylindre (12, 14), la section de pression en amont (26) s'embranche à l'intérieur du dispositif de dosage (10) dans les deux conduites (26A, 26B), débouchant chacune dans une des deux chambres (20, 22) disposées des deux côtés du piston (18) et dans lequel le carburant est amené à la pression finale nécessaire au brûleur par un mouvement d'avant en arrière du piston (18) alternativement dans la première chambre (20) et dans la seconde chambre (22).
  2. Dispositif d'alimentation de carburant selon la revendication 1, caractérisé en ce que la section de pression en amont (28) est alimentée en carburant par deux conduites (28A, 28B) se rassemblant à l'intérieur du dispositif de dosage (10) et débouchant dans les deux chambres (20, 22).
  3. Dispositif d'alimentation de carburant selon l'une des revendications précédentes, caractérisé en ce que le dispositif de dosage (10) comporte au moins une soupape de chasse (30), au moyen de laquelle les chambres (20 ou 22) sont reliées à la section de pression en amont (26) de la conduite de carburant (24) et qui est fermée par le décalage du piston (18).
  4. Dispositif d'alimentation en carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de dosage (10) comporte au moins un clapet antiretour (32) avec un ressort (36) au moyen duquel au moins une des chambres (20 ou 22) est reliée à la section de pression en amont (28).
  5. Dispositif d'alimentation en carburant selon la revendication 4, caractérisé en ce que le clapet antiretour (32) est conçu de manière à ce que la pression d'ouverture soit légèrement supérieure à la pression en amont.
  6. Dispositif d'alimentation en carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de dosage (10) comporte une bobine magnétique (42) au moyen de laquelle le piston (18) peut être décalé axialement.
  7. Dispositif d'alimentation en carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que le piston (18) est prétendu au moyen d'un ressort (40) dans une direction, en particulier dans la direction de la seconde chambre (22).
  8. Dispositif d'alimentation en carburant selon l'une des revendications 1 à 7, caractérisé en ce que le dispositif de dosage (10) est réglé à une pression en amont de 2 à 10 bars, en particulier 5 à 8 bars.
  9. Véhicule avec un appareil de chauffage entraíné par carburant et un dispositif d'alimentation en carburant alimentant cet appareil selon l'une des revendications 1 à 8.
EP02004609A 2001-03-07 2002-02-28 Dispositif d'alimentation en carburant pour système de chauffage mobile Expired - Fee Related EP1239221B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10111004A DE10111004A1 (de) 2001-03-07 2001-03-07 Mobiles Heizgerät mit einer Brennstoffzuführeinrichtung
DE10111004 2001-03-07

Publications (4)

Publication Number Publication Date
EP1239221A2 EP1239221A2 (fr) 2002-09-11
EP1239221A3 EP1239221A3 (fr) 2002-10-02
EP1239221B1 true EP1239221B1 (fr) 2005-06-15
EP1239221B8 EP1239221B8 (fr) 2005-08-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02004609A Expired - Fee Related EP1239221B8 (fr) 2001-03-07 2002-02-28 Dispositif d'alimentation en carburant pour système de chauffage mobile

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EP (1) EP1239221B8 (fr)
DE (2) DE10111004A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004002245A1 (de) 2004-01-15 2005-08-11 J. Eberspächer GmbH & Co. KG Dosierpumpe

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1894390U (de) * 1960-05-04 1964-06-11 Danfoss Ved Ing M Clausen Oelbrenner fuer heizungsanlagen.
GB1144142A (en) * 1965-03-13 1969-03-05 Walter Eberspacher Reciprocating fuel pump, particularly for oil-fired furnaces
US3884125A (en) * 1971-02-08 1975-05-20 Philip E Massie Variable displacement sealed pump
DE2315842B2 (de) * 1973-03-30 1977-12-29 Fa. J. Eberspächer, 7300 Esslingen Durch einen elektromagneten betaetigte brennstoffkolbenpumpe, insbesondere fuer brennstoffeuerungen
US5051074A (en) * 1990-02-13 1991-09-24 Cowan Philip L Bi-directional reciprocating pump mechanism
DE4243866A1 (de) 1992-12-23 1994-06-30 Thomas Magnete Gmbh Elektromagnetisch betriebene Pumpe
DE19545677B4 (de) 1995-12-07 2006-11-30 J. Eberspächer GmbH & Co. KG Brennstoffbetriebenes Heizgerät, insbesondere Fahrzeug-Heizgerät mit atmosphärischem Verdampferbrenner
DE19822872B4 (de) * 1998-05-22 2005-10-13 J. Eberspächer GmbH & Co. KG Dosierpumpe für flüssigen Brennstoff, insbesondere einer brennkraftbetriebenen Heizeinrichtung eines Kraftfahrzeuges
DE29913236U1 (de) * 1999-08-04 2000-01-05 Werner Hans G Gmbh & Co Heizöl-Förderaggregat
CZ292533B6 (cs) * 1999-11-18 2003-10-15 Brano-Ateso A.S., Člen Brano Group Elektromagnetické pístové čerpadlo
DE10045281C1 (de) * 2000-09-13 2002-05-23 Orange Gmbh Hochdruckpumpe

Also Published As

Publication number Publication date
DE50203392D1 (de) 2005-07-21
EP1239221A2 (fr) 2002-09-11
EP1239221B8 (fr) 2005-08-10
DE10111004A1 (de) 2002-09-26
EP1239221A3 (fr) 2002-10-02

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