EP1239221A2 - Brennstoffzuführeinrichtung für ein mobiles Heizgerät - Google Patents
Brennstoffzuführeinrichtung für ein mobiles Heizgerät Download PDFInfo
- Publication number
- EP1239221A2 EP1239221A2 EP02004609A EP02004609A EP1239221A2 EP 1239221 A2 EP1239221 A2 EP 1239221A2 EP 02004609 A EP02004609 A EP 02004609A EP 02004609 A EP02004609 A EP 02004609A EP 1239221 A2 EP1239221 A2 EP 1239221A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- piston
- fuel supply
- supply device
- 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.)
- Granted
Links
Images
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, in particular for use in a motor vehicle which is in operation of the Heater promotes fuel to a burner.
- the invention further relates to a Motor vehicle with a heater and such Fuel supply.
- a mobile heater is called a so-called additional air heater or additional water heater in motor vehicles, such as passenger cars, Commercial vehicles, buses or ships. It is usually used for Heating a passenger compartment or preheating the cooling water Combustion engine.
- DE 195 45 677 A1 describes a fuel-operated heating device, in particular a Vehicle heater with atmospheric evaporation burner, known from the one designed as a suction pump fuel pump by a Suction line sucks from a fuel tank and through a pressure line Evaporation burner feeds. In the pressure line is immediately before Evaporation burner arranged a check valve, which is an empty steaming of the Pressure line prevented.
- Suction pumps of this shape allow the burner of the Heater fuel can be fed with high dosing accuracy.
- the disadvantage is that a separate suction line for the suction pump must be provided from the tank or other suitable Location of the remaining unpressurized fuel line system of the motor vehicle leads to the suction pump.
- the installation of such a suction line is special expensive when retrofitting a heater.
- a metering pump is installed in this way can be that there is a "high" fuel pressure on the input side.
- high fuel pressure for example, a pressure of 2 bar is given.
- a reduction in the pressure of the in the Dosing pump to be introduced fuel is required.
- the primary pressure for the dosing pump is only a pressure of 230 mbar.
- a pressure control valve can be integrated on the inlet side.
- the fuel is used on engines relatively high pressures, for example supplied with up to 8 bar.
- This Pressures enable new fuel injection techniques, such as for example the common rail system or time-controlled Single pump systems (pump-nozzle unit and pump-line-nozzle).
- the invention has for its object a fuel supply device for to improve a heater of the type mentioned so that the above mentioned disadvantages are overcome and these in particular cheaper is designed.
- a fuel supply device solved the features of claim 1 with a fuel line has a pre-printing section and a final printing section, between which a metering device is arranged, which is set up so that you Fuel is supplied under a pre-pressure and it presses the pre-pressure immediately increased to a final pressure to supply the fuel to the burner.
- the object is further achieved according to claim 11 with a vehicle in which a Such a heater with a fuel supply device according to the invention is installed.
- the basic idea of the invention is that it is for previously known metering pumps it is imperative that there is only a very low pre-pressure on the inlet side, but that a metering device can be designed that a highly accurate Dosing also with a relatively high pre-pressure on the input side guaranteed.
- This high form initially has the advantage that the Heater according to the invention at a desired location in the fuel line system of the motor vehicle can be connected.
- the high pre-pressure also leads to the metering device need only generate a relatively small increase in pressure in order to to achieve the desired final pressure.
- the one on the engine of the motor vehicle available pressure is not reduced so that it is then reduced again to increase, as described in DE 198 22 872 A1, but it is immediately on the required final pressure increased.
- the metering device is therefore proportional trained inexpensively and also has a lower Energy consumption.
- the fuel supply device can be particularly advantageous be used when its metering device is on a pre-pressure of 2 to 10 bar, in particular from 5 to 8 bar.
- This form can be from a flow line, a return line or a fuel chamber are provided, in which by means of an in-vehicle or non-vehicle fuel pump pressure is built up.
- the fuel pump does not have to dose the fuel like conventional dosing pumps do, but only has to provide the form. Dosing the According to the invention, fuel for the burner of the heater is produced by means of the Metering device.
- the metering device has a piston which in a cylinder is slidably mounted at one end of the piston a first chamber with variable volume is formed by the Pre-pressure section of the fuel line is supplied with fuel under pre-pressure can be.
- the fuel entering the chamber is displaced of the piston towards the burner in the final pressure section of the Fuel line promoted.
- the pressure of the fuel will, at least slightly, further increased.
- the Fuel is metered into the burner. In other words, the Fuel conveyed to the burner in portions.
- a metering device developed in this way is particularly advantageous on second end of the piston to a second chamber, which is also from the cylinder is limited and the fuel can be supplied under pre-pressure.
- the Piston of the metering device is thus at its two ends with under The pre-pressure of the fuel is loaded, thus balancing forces is made on the piston. If the piston is now to be moved, from the driving unit only to increase the pressure on the Final pressure required force can be generated.
- both the first chamber as well as the second chamber with the pre-pressure section and connected to the indentation section so that when moving back and forth of the piston fuel is alternately fed into the final pressure section.
- the pre-printing section and / or final printing section branch advantageously within the metering device in two with the lines communicating in each chamber.
- the fuel supply device is also special inexpensive to manufacture by providing at least one overflow valve, by means of which the first chamber with the pre-pressure section of the fuel line is connected and which is closed by moving the piston.
- a follow-up valve can be easily through a follow-up opening be educated, i.e. a radial bore, the one when the piston is in the normal position Wall of the cylinder penetrated in front of one end of the piston. Will the Moved piston out of its rest position, it runs over the overrun opening and closes it with it. If you move the piston further, it will move in fuel from the first chamber initially enclosed pushed out and fed to the burner.
- the overflow valve as a so-called central valve in the piston itself.
- the first chamber formed on the metering device is particularly advantageous with a check valve with a spring, by means of which the first chamber is connected to the end pressure section of the fuel line.
- This Check valve prevents fuel from escaping from the first chamber. Fuel under pre-pressure can therefore not by itself through the metering device pass through, as is the case with the electromagnetically operated Pump according to DE 42 43 866 A1 can occur.
- the Fuel supply device further developed according to the invention on a check valve to be dispensed with, as described in DE 195 45 677 A1.
- the check valve is designed to be Opening pressure is slightly above the inlet line pressure. This enables the metering device to be arranged directly on the burner can be. The metering of the fuel is particularly precise in this case a particularly space-saving solution has been found. Since the route of the Final pressure section of the fuel line is also relatively short is designed, the burner can very after switching off the metering device can be quickly supplied with fuel again.
- the piston of the dosing device further developed according to the invention is actuated particularly advantageously by means of a magnetic coil.
- This can be powered by electrical current, either over time is fixed or taking into account other factors can be changed, for example, by means of a control device.
- a metering device 10 shown in FIG. 1 has a housing block 12, in which a circular cylindrical cavity 14 is formed, which relates to 1 extends along a horizontal axis 16.
- the housing block 12 forms with the cavity 14 a cylinder in which a circular cylindrical piston 18th is sealingly slidably mounted.
- the piston 18 divides the cavity 14 into one first chamber 20, which is based on FIG. 1 at the left end of the piston 18 is located, and a second chamber 22, which is based on Fig.1 on the right End of the piston 18 is located.
- a fuel line 24 leads through the metering device 10. This is through the first chamber 20 into a pre-pressure section 26 and a End printing section 28 divided.
- the form section 26 is through a line 26A, which extends radially to the axis 16 through the housing block 12 and opens into the first chamber 20 at a trailing opening 30.
- a Pressure relief line 31 leads from said bore through the Housing block 12 and opens in the form of a line 28B in the second chamber 22.
- the end pressure section 28 is designed by means of a line 28A which extends also extends radially to the axis 16 and in the extreme left in relation to FIG End region of the cavity 14 leads out of this.
- the pre-pressure section 26 does not pre-fuel from one Chamber of a fuel line system shown Internal combustion engine supplied. This can be done, for example, by means of a relatively imprecise pump, such as a vibrating piston pump, happen.
- the end pressure section 28 is one with a burner, not shown Fuel operated heater connected, for example Coolant of the internal combustion engine and preheated an interior of an associated vehicle can be heated.
- a check valve 32 is arranged, which in closed state, the first chamber 20 closes liquid-tight.
- the first chamber 20 opposite side of the check valve 32 leads the end pressure section 28 with line 28A out of cavity 14.
- the Check valve 32 has a valve plate 34, which is countered by a spring 36 a valve seat 38 is pressed.
- the piston 18 is slidably held by a tension spring 40 which in the arranged in the second chamber 22 and on the end wall of the cavity 14 is attached.
- the piston 18 is also radially surrounded by a magnetic coil 42, which is embedded in the housing block 12 and by its changing Excitation of the piston 18 can be set into an oscillating movement.
- the wake opening 30 acts like a wake valve, which has a wake of fuel only possible if the piston 18 at least in is essentially in its basic position shown in Fig.1. Now the Dosing device 10 taken into function, the piston 18 by means of Solenoid 42 along axis 16 toward first chamber 20 postponed. The end of the piston 18 facing the first chamber 20 runs over the trailing opening 30, which is thereby closed.
- the pressure of the outflowing fuel is due to the counter pressure of the spring 36 determined at the check valve 32.
- the amount discharged is because of the fuel is essentially not compressible, determined by the stroke of the piston 18. If necessary, this stroke can be controlled by appropriate control of the Solenoid 42 changed according to the currently existing form become.
- measuring devices can be provided, by means of which the Form and / or the final pressure is determined.
- the solenoid 42 is shut down and the piston 18 becomes withdrawn from the tension spring 40 into its basic position. In this position fuel flows under pre-pressure through the trailing opening 30 into the first Chamber 20 after.
- FIG. 2 shows an embodiment of a metering device 10, in which the Piston 18 is designed as a double-acting piston.
- the first chamber 20 is at one end of the piston 18 and one at this arranged check valve 32 corresponding to that described above Embodiment formed and via a line 26A to the Pre-printing section 26 and via a line 28A to the final printing section 28 connected to the fuel line 24.
- the second chamber 22 is both in this embodiment with the pre-pressure section 26 via a line 26B as well as with the End pressure section 28 connected via a line 28B.
- a check valve 32 which is like the check valve 32 is designed on the first chamber 20.
- the first and second Chamber 20 and 22 leading lines 28A and 28B are in one Final pressure section 28 of the fuel line summarized. They are just like that into the first chamber 20 and the second chamber 22 in lines leading into it 26A and 26B in the metering device 10 in a pre-pressure section 26 summarized
- the connections of the second chamber 22 to the pre-pressure and the end pressure section 26 and 28 of the fuel line 24 are corresponding designed on the first chamber 20.
- the connection of the Forming section 26 on the second chamber 22 by means of a trailing opening 30 designed as a follow-up valve.
- the piston 18 is at both ends by a compression spring 44 biased, which are arranged in the chambers 20 and 22 and to the Support valve seats 38 of the respective check valves 32.
- the piston 18 In operation of the metering device 10 according to the exemplary embodiment in FIG. 2 is the piston 18 from the basic position shown in Figure 2 by means of Solenoid 42 first in one and then in the opposite Direction shifted along the axis 16.
- the solenoid 42 has two Windings, not shown, which can be controlled separately.
- the piston 18 performs two strokes, one in each of which executes fuel 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 28 shifted and thus fed to the burner mentioned.
- the doses that follow each other in quick succession result from the Metering device 10 according to this embodiment is particularly small Pressure fluctuations in the final pressure section 28 of the fuel line 24. This leads to a particularly precise quantitative metering of the fuel.
- the one or more check valves 32 perform a double function. You limit or control the final pressure with which fuel from the Dosing device 10 is conveyed out, on the other hand it blocks or block the fuel line 24 while no fuel is being delivered. Thereby emptying or empty steaming of the fuel line 24 is reliably prevented. The "zero termination" of the fuel line 24 required for heaters is thus guaranteed.
- a check valve, as in the heater according to DE 195 45 677 A1 is described, is not in the illustrated embodiments needed.
Landscapes
- 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)
Abstract
Description
- Fig.1
- ein erstes Ausführungsbeispiel einer Dosiereinrichtung im Längsschnitt, und
- Fig.2
- ein zweites Ausführungsbeispiel einer Dosiereinrichtung ebenfalls im Längsschnitt.
- 10
- Dosiereinrichtung
- 12
- Gehäuseblock
- 14
- zylinderförmiger Hohlraum
- 16
- Achse des Hohlraums
- 18
- Kolben
- 20
- erste Kammer
- 22
- zweite Kammer
- 24
- Brennstoffleitung
- 26
- Vordruckabschnitt
- 26A
- Leitung
- 26B
- Leitung
- 28
- Enddruckabschnitt
- 28A
- Leitung
- 28B
- Leitung
- 30
- Nachlaufventil (Nachlauföffnung)
- 31
- Druckentlastungsleitung
- 32
- Rückschlagventil
- 34
- Ventilteller
- 36
- Ventilfeder
- 38
- Ventilsitz
- 40
- Zugfeder
- 42
- Magnetspule
- 44
- Druckfeder
Claims (13)
- Brennstoffzuführeinrichtung für ein mobiles Heizgerät, insbesondere für eine Verwendung in einem Kraftfahrzeug, die im Betrieb des Heizgerätes Brennstoff zu einem Brenner fördert, dadurch gekennzeichnet, dass die Brennstoffzuführeinrichtung wenigstens eine Kammer (20, 22) aufweist, in die eine Brennstoffleitung (24) mit einem Vordruckabschnitt (26) einmündet und aus der eine Leitung (28A, 28B) mit einem Enddruckabschnitt (28) ausmündet, und dass zwischen dem Vordruckabschnitt (26) und dem Enddruckabschnitt (28) eine einen bewegbaren Kolben (18) aufweisende Dosiereinrichtung (10) angeordnet ist, mittels der der Brennstoff unmittelbar auf den vom Brenner benötigten Enddruck erhöht wird.
- Brennstoffzuführeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Kolben (18) in einem Zylinder (12, 14) verschiebbar gelagert ist und an einem Ende des Kolbens (18) eine erste Kammer (20) mit veränderbarem Volumen gebildet ist.
- Brennstoffzuführeinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass am anderen Ende des Kolbens (18) eine zweite Kammer (22) mit veränderbarem Volumen gebildet ist.
- Brennstoffzuführeinrichtung nach Anspruch 3, dadurch gekennzeichnet, dass bei einem Hin- und Herbewegen des Kolbens (18) wechselweise in der ersten Kammer (20) und in der zweiten Kammer (22) Brennstoff auf den vom Brenner benötigten Enddruck erhöht wird.
- Brennstoffzuführeinrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass der Vordruckabschnitt (26) sich innerhalb der Dosiereinrichtung (10) in zwei Leitungen (26A, 26B) verzweigt, von denen jede in eine der Kammern (20, 22) einmündet.
- Brennstoffzuführeinrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass der Enddruckabschnitt (28) aus zwei von den beiden Kammern (20, 22) ausmündenden, sich innerhalb der Dosiereinrichtung (10) vereinigenden Leitungen (28A, 28B) mit Brennstoff gespeist wird.
- Brennstoffzuführeinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Dosiereinrichtung (10) wenigstens ein Nachlaufventil (30) aufweist, mittels dem die Kammern (20 bzw. 22) mit dem Vordruckabschnitt (26) der Brennstoffleitung (24) verbunden ist und das durch Verschieben des Kolbens (18) verschlossen wird.
- Brennstoffzuführeinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Dosiereinrichtung (10) wenigstens ein Rückschlagventil (32) mit einer Feder (36) aufweist, mittels dem wenigstens eine der Kammern (20 bzw. 22) mit dem Enddruckabschnitt (28) verbunden ist.
- Brennstoffzuführeinrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Rückschlagventil (32) derart ausgebildet ist, dass sein Öffnungsdruck etwas über dem Vordruck liegt.
- Brennstoffzuführeinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Dosiereinrichtung (10) eine Magnetspule (42) aufweist, mittels der der Kolben (18) axial verschoben werden kann.
- Brennstoffzuführeinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Kolben (18) mittels einer Feder (40) in eine Richtung, insbesondere in Richtung auf die zweite Kammer (22) vorgespannt ist.
- Brennstoffzuführeinrichtung nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Dosiereinrichtung (10) auf einen Vordruck von 2 bis 10 bar, insbesondere von 5 bis 8 bar eingerichtet ist.
- Kraftfahrzeug mit einem brennstoffbetriebenen Heizgerät und einer dieses Heizgerät versorgenden Brennstoffzuführeinrichtung nach einem der Ansprüche 1 bis 12.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10111004 | 2001-03-07 | ||
DE10111004A DE10111004A1 (de) | 2001-03-07 | 2001-03-07 | Mobiles Heizgerät mit einer Brennstoffzuführeinrichtung |
Publications (4)
Publication Number | Publication Date |
---|---|
EP1239221A2 true EP1239221A2 (de) | 2002-09-11 |
EP1239221A3 EP1239221A3 (de) | 2002-10-02 |
EP1239221B1 EP1239221B1 (de) | 2005-06-15 |
EP1239221B8 EP1239221B8 (de) | 2005-08-10 |
Family
ID=7676634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02004609A Expired - Lifetime EP1239221B8 (de) | 2001-03-07 | 2002-02-28 | Brennstoffzuführeinrichtung für ein mobiles Heizgerät |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1239221B8 (de) |
DE (2) | DE10111004A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1555435A3 (de) * | 2004-01-15 | 2006-01-18 | J. Eberspächer GmbH & Co. KG | Dosierpumpe |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4243866A1 (de) | 1992-12-23 | 1994-06-30 | Thomas Magnete Gmbh | Elektromagnetisch betriebene Pumpe |
DE19545677A1 (de) | 1995-12-07 | 1997-06-12 | Eberspaecher J | Brennstoffbetriebenes Heizgerät, insbesondere Fahrzeug-Heizgerät mit atmosphärischem Verdampferbrenner |
DE19822872A1 (de) | 1998-05-22 | 1999-12-02 | Eberspaecher J Gmbh & Co | Dosierpumpe für flüssigen Brennstoff, insbesondere einer brennkraftbetriebenen Heizeinrichtung eines Kraftfahrzeuges |
Family Cites Families (8)
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 |
DE29913236U1 (de) * | 1999-08-04 | 2000-01-05 | Hans G. Werner GmbH & Co, 72768 Reutlingen | 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 |
-
2001
- 2001-03-07 DE DE10111004A patent/DE10111004A1/de not_active Ceased
-
2002
- 2002-02-28 DE DE50203392T patent/DE50203392D1/de not_active Expired - Lifetime
- 2002-02-28 EP EP02004609A patent/EP1239221B8/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4243866A1 (de) | 1992-12-23 | 1994-06-30 | Thomas Magnete Gmbh | Elektromagnetisch betriebene Pumpe |
DE19545677A1 (de) | 1995-12-07 | 1997-06-12 | Eberspaecher J | Brennstoffbetriebenes Heizgerät, insbesondere Fahrzeug-Heizgerät mit atmosphärischem Verdampferbrenner |
DE19822872A1 (de) | 1998-05-22 | 1999-12-02 | Eberspaecher J Gmbh & Co | Dosierpumpe für flüssigen Brennstoff, insbesondere einer brennkraftbetriebenen Heizeinrichtung eines Kraftfahrzeuges |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1555435A3 (de) * | 2004-01-15 | 2006-01-18 | J. Eberspächer GmbH & Co. KG | Dosierpumpe |
US7621726B2 (en) | 2004-01-15 | 2009-11-24 | J. Eberspächer GmbH & Co. KG | Metering pump |
Also Published As
Publication number | Publication date |
---|---|
DE50203392D1 (de) | 2005-07-21 |
DE10111004A1 (de) | 2002-09-26 |
EP1239221B1 (de) | 2005-06-15 |
EP1239221A3 (de) | 2002-10-02 |
EP1239221B8 (de) | 2005-08-10 |
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