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WO1995007439A1 - Configuration de pompe pour un bruleur a mazout et procede de regulation de la capacite dudit bruleur - Google Patents

Configuration de pompe pour un bruleur a mazout et procede de regulation de la capacite dudit bruleur Download PDF

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Publication number
WO1995007439A1
WO1995007439A1 PCT/DK1994/000323 DK9400323W WO9507439A1 WO 1995007439 A1 WO1995007439 A1 WO 1995007439A1 DK 9400323 W DK9400323 W DK 9400323W WO 9507439 A1 WO9507439 A1 WO 9507439A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
valve
pressure
pump arrangement
arrangement according
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/DK1994/000323
Other languages
English (en)
Inventor
Poul Kirkelund
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.)
Danfoss AS
Original Assignee
Danfoss AS
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6496871&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1995007439(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Danfoss AS filed Critical Danfoss AS
Priority to EP94926110A priority Critical patent/EP0715704B1/fr
Priority to DE69419256T priority patent/DE69419256T2/de
Publication of WO1995007439A1 publication Critical patent/WO1995007439A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • 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
    • F23K5/04—Feeding or distributing systems using pumps
    • 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

Definitions

  • the invention relates to a pump arrangement for an oil burner according to the preamble of claim 1, and to a method for regulating the capacity of an oil burner according to the preamble of claim 14.
  • Known oil burners operate with a predetermined power level at which the pump arrangement delivers the oil at a constant, generally adjustable, pressure to the atomizer unit, in particular a nozzle.
  • Matching the pump output to the required heat output of the boiler or similar vessel is effected by switching the oil burner on and off. Incomplete combustion resulting from this switching on and off pollutes the environment, however, and causes deposits to form on the nozzle and in the combustion chamber and so on.
  • the pressure-side output of the continuously operating supply pump is connected by way of a non-return valve, which opens only when the oil pressure is above 2 bars, to the atomizer unit and is connected by way of a rhythmically controllable electromagnetic valve to the oil reservoir.
  • a non-return valve which opens only when the oil pressure is above 2 bars
  • a rhythmically controllable electromagnetic valve to the oil reservoir.
  • the oil throughput can be reduced to about 20% of the amount that is delivered with a permanently closed electromagnetic valve.
  • the service life of the electromagnetic valve is limited, however, because of the high frequency with which it opens and closes. In addition, there is a high noise level.
  • the pump arrangement has two operational states, in which, with the pump running, different amounts of oil are delivered. Demand can be matched by use of a conventional thermostat which, by operating the change-over device, alternately causes the first or the second operational state to be effective at the connection leading to the atomizer unit. Since the intervals during oil feed with modulated pressure are so brief that the flame in the combustion chamber is not extinguished, a continuous operation with proper power regulation can be achieved, without the disadvantages mentioned in the introduction as a result of the pump switching on and off occurring.
  • the change-over device is constituted by the on-off valve which, on account of its low operating frequency, has a long service life even when in the form of an electromagnetic valve.
  • the modulation valve requires no special regulation, since the change-over device already exists for that purpose.
  • the modulation valve can therefore be of simple construction, operate at a constant switching rate, and for example, be mechanically driven.
  • two outputs are provided with constant or modulated pressure.
  • the mode of operation of the second output can be achieved most simply with a modulation valve which connects the second output alternately with the output side and the intake or return side of the pump.
  • the modulation valve does not need to be regulated. It is sufficient for modulation to be effected at a constant frequency and pulse shape.
  • the gear pump according to claim 5 is particularly advantageous for the construction of the rotary slide valve. It is also an advantage that such a gear pump as a heating oil pump has proved a millionfold success.
  • the pressure at the first output can be kept strictly constant.
  • the maximum amplitude of the modulated pressure is also limited to the set value.
  • the pump arrangement can be operated at two different pressure levels.
  • the normally operative higher-pressure regulating valve loses its function when the second lower-pressure regulating valve is rendered operative by the on-off valve.
  • four power levels are achieved, because the two pressure levels have an influence on the conditions both at the first output and at the second output.
  • the change-over device according to claim 12 consists of two on-off valves, no additional on-off valve is required to disconnect completely the line leading to the atomizer unit.
  • the non-return valve according to claim 13 ensures in a manner known per se that the atomizer unit is supplied with oil only when the oil has reached a sufficiently high atomization pressure.
  • the problem of the invention is solved by the method having features specified in claim 14. By using two power levels, power matching in the context of on-off control is possible, without the oil feed having to be switched off.
  • the development according to claim 15 has the advantage that the pressure preset for the first power level is also effective for the second power level.
  • the construction according to claim 16 leads to a total of four power levels with which the capacity control can be effected over a very large power range.
  • Fig. 1 shows diagrammatically the circuit diagram of a pump arrangement according to the invention
  • Fig. 2 shows a second embodiment of a pump arrangement according to the invention
  • Fig. 3 is a graph of pressure plotted against time
  • Fig. 4 is a longitudinal section through a gear pump with a built-in modulation valve
  • Fig. 5 is a plan view of the gear pump of Fig. 4, assuming the cover plate to be transparent
  • Fig. 6 shows a modified embodiment in a view similar to that of Fig. 4
  • Fig. 7 is a plan view of the embodiment of Fig. 6, assuming the cover plate to be transparent
  • Fig. 8 shows a further embodiment of the pump arrangement
  • Fig. 9 shows a section through the drive shaft of that embodiment.
  • Fig. 1 shows a pump arrangement 1 for an oil burner having, in addition to a blower, not illustrated, an atomizer unit 2 with an atomizing nozzle 3, and a non-return valve 4, which opens only when an adequate atomization pressure is present.
  • An associated nozzle line 5 is connected to a connection 6 of the pump arrangement 1.
  • the pump arrangement has a rotary pump 7 which draws oil from a reservoir 8 by way of an intake line 9 and a filter 10 and then feeds it from the intake side 11 to the output side 12.
  • This output side 12 is connected by way of a throttle 13 to a return line 14 leading to the reservoir 8.
  • a non-return valve 16 which becomes effective whenever the system operates in single-line mode.
  • the output side 12 forms a first output 17.
  • a change-over device 21 consists of a first on-off valve 22 and a second on-off valve 23, both of which are in the form of electromagnetic valves.
  • the first on-off valve 22 is arranged between the first output 17 and the connection 6, the second on-off valve 23 is arranged between the second output 20 and the connection 6.
  • a temperature sensor 24 relays the boiler temperature, that is, the temperature of the water warmed by the heated boiler, to a regulator 25, which is preset at a desired temperature 26.
  • the regulator controls the on-off valves 22 and 23 by way of the signal lines 27 and 28.
  • the temperature is too low, the first output 17 becomes effective, and at too high a temperature the second output 20 becomes effective.
  • the individual pulses of modulated pressure follow each other so quickly that the flame in the combustion chamber is not extinguished but ignites the freshly supplied oil immediately. In this manner the burner can be operated as it were continuously, so that the problems (environmental pollution and the like) associated with switching the system on and off are avoided.
  • a new feature is that the modulation valve is built into the rotary pump 29. Furthermore, in a branch parallel to the first pressure regulator 15, a second pressure regulator 30, which is set to a lower pressure than the first pressure regulator 15, is arranged in series with an on-off valve 31.
  • the latter is illustrated as a normally open electromagnetic valve and is operated by way of a signal line 32 by the regulator 25. If the on-off valve 31 is closed, there is a higher pressure on the output side 12, but if the on-off valve 31 is open, there is a lower pressure. With the on-off valve 31 closed, the operating conditions are the same as in Fig. 1. With the on-off valve 31 open, conditions are similar but at a lower pressure or power level.
  • Fig. 3 illustrates four power levels A, B, C and D, the power levels A and B applying to both embodiments.
  • the largest feed rate, and thus the greatest power, is obtained at power level A, at which the feed pressure PI is constant.
  • the on-off valve 22 is open, while the on-off valves 23 and 31 are closed.
  • a lower power is achieved at stage B, when a modulated pressure with a maximum amplitude PI is present.
  • the on-off valve 23 is open, while the on-off valves 22 and 31 are closed.
  • Next is power level C, where the lower pressure P2 is maintained constant. This happens when the on-off valves 22 and 31 are open and the on-off valve 23 is closed.
  • Last is power level D, which provides a modulated pressure with a maximum amplitude P2.
  • the on-off valves 23 and 31 must be open, while the on-off valve 22 is closed.
  • FIGs 4 and 5 show a gear pump with a built-in modulation valve.
  • a housing 33 has a cylindrical recess 34 which is covered over by a cover plate 35 and receives a rotatable gear ring 36 with internal teeth.
  • the gear ring forms pockets 37 with an externally toothed gearwheel 38 which is arranged eccentrically with respect to the gear ring 36 and is driven by way of a shaft 39 by a motor.
  • In the cover plate 35 there is a pressure groove 40, which is connected by way of a channel 41 to the output side 12, and an intake groove 42, which is connected by way of a channel 43 to the intake side 11.
  • Such a pump is known as a gerotor gear pump.
  • annular groove 44 On the outer circumference of the gear ring 36 there is an annular groove 44. Leading from that is a radial channel which forms a valve opening 45. During rotation of the gear ring 36, the valve opening communicates alternately with the region below the pressure groove 40 and with the region below the intake groove 42. In addition, the annular groove 44 is connected to a channel 46 which leads to the second output 20. This second output is consequently alternately pressurized with high pressure and with intake or return pressure, that is, with modulated pressure.
  • the gear pump is of the same construction as in Figs 4 and 5. Reference numbers increased by 100 have therefore been used for corresponding parts.
  • the essential difference is that in the cover plate 135 there is formed an annular groove 144 which extends along the front face of the gear wheel 138 and is connected to a line 146 leading to the second output 20.
  • a recess in the front face of the gear wheel 138 serves as the valve opening 145. This recess extends radially into the region of the pressure groove 140 and the intake groove 142.
  • this valve opening 145 communicates alternately with the output side and the intake side.
  • a modulated pressure consequently forms at the second output 20.
  • the drive shaft 239 of the rotary pump 7 which has a valve opening 245 in the form of part of an annular groove, forms the modulation valve 218.
  • the associated housing 233 there is a valve opening 240 in the form of a bore which is connected to the output side 12 of the pump, and a valve opening 242 in the form of a bore which is connected to the intake side 11 of the pump.
  • the modulation valve 218 is in series with an on-off valve 221 arranged between the output side and the return line 14 and serving as the change-over device. If the on-off valve 221 is opened, there is modulated pressure present at the connection 6, if it is closed, there is a constant pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Rotary Pumps (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

Configuration (1) de pompe pour un brûleur à mazout qui possède une connexion (6) au niveau de laquelle du mazout est apporté à une pression constante, et dispositif destiné à créer une pression modulée, en particulier soupape (18) de modulation. Un dispositif de commutation (21) applique sélectivement la pression modulée ou constante à la connexion (6). Un procédé de régulation de la capacité d'un brûleur à mazout comporte un premier niveau de puissance qui peut être mis en marche et arrêté et auquel l'unité de pulvérisation (2) est alimentée en mazout à une pression constante, et un second niveau réduit de puissance auquel l'alimentation en mazout se fait à une pression modulée. De cette manière, la régulation de puissance peut être effectuée sans qu'il soit nécessaire d'éteindre le brûleur à mazout.
PCT/DK1994/000323 1993-09-04 1994-08-29 Configuration de pompe pour un bruleur a mazout et procede de regulation de la capacite dudit bruleur Ceased WO1995007439A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP94926110A EP0715704B1 (fr) 1993-09-04 1994-08-29 Configuration de pompe pour un brûleur à mazout
DE69419256T DE69419256T2 (de) 1993-09-04 1994-08-29 Pumpenanordnung für einen Ölbrenner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4329955.5 1993-09-04
DE4329955A DE4329955C2 (de) 1993-09-04 1993-09-04 Pumpenanordnung für einen Ölbrenner und Verfahren zur Kapazitätsregelung dieses Ölbrenners

Publications (1)

Publication Number Publication Date
WO1995007439A1 true WO1995007439A1 (fr) 1995-03-16

Family

ID=6496871

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1994/000323 Ceased WO1995007439A1 (fr) 1993-09-04 1994-08-29 Configuration de pompe pour un bruleur a mazout et procede de regulation de la capacite dudit bruleur

Country Status (3)

Country Link
EP (1) EP0715704B1 (fr)
DE (2) DE4329955C2 (fr)
WO (1) WO1995007439A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3429779B2 (ja) 1996-11-02 2003-07-22 ヨット エーバーシュペッヘル ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディト ゲゼルシャフト エンジンとは無関係な車両暖房装置のための圧力噴霧化バーナ
DE10252640B3 (de) * 2002-11-11 2004-08-05 Danfoss A/S Ölbrenneranordnung

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19620874A1 (de) * 1996-05-23 1997-11-27 Bmw Rolls Royce Gmbh Kraftstoffeinspritzung für eine gestufte Gasturbinen-Brennkammer
DE19807240A1 (de) * 1998-02-20 1999-08-26 Herrmann Einspritzsystem
DE10020089B4 (de) * 2000-04-22 2005-06-23 Daimlerchrysler Ag Verfahren und Vorrichtung zum dosierten Einbringen eines Flüssigkeitsvolumenstroms in ein System
EP1378709A3 (fr) * 2002-07-01 2004-07-14 J. Eberspächer GmbH & Co. KG Brûleur pour chauffage de véhicule
DE10230401A1 (de) * 2002-07-05 2004-01-22 J. Eberspächer GmbH & Co. KG Brennstoffdruckregler, insbesondere für einen Zerstäuberbrenner für ein Fahrzeugheizgerät
DE102004050558B4 (de) * 2004-10-15 2012-03-15 Webasto Ag Brennstoffzufuhrvorrichtung für ein Kraftfahrzeugheizgerät
DE102005011632B4 (de) * 2005-03-14 2009-01-22 Webasto Ag Zerstäubungsbrenner für ein Heizgerät

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE359639B (fr) * 1968-09-17 1973-09-03 Danfoss As
DE2033383B2 (de) * 1970-07-06 1977-12-08 Eckerle, Otto, 7502 Maisch Oelbrennerpumpe
DE3311438A1 (de) * 1982-06-04 1983-12-08 Sundstrand Corp., 61125 Rockford, Ill. Brennstoffzufuhrsystem fuer brenner mit ruecklauf

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528401A1 (de) * 1965-04-17 1969-07-10 Danfoss As Pumpe
DE2039046A1 (de) * 1970-08-06 1972-02-10 Broetje Fa August OEl-Foerderpumpe
CH594137A5 (fr) * 1976-01-27 1977-12-30 Cyphelly Ivan J
US4391580A (en) * 1980-12-08 1983-07-05 Sundstrand Corporation Liquid fuel supply system for an atomization burner nozzle
DE4113067A1 (de) * 1991-04-22 1992-10-29 Stiebel Eltron Gmbh & Co Kg Zufuehreinrichtung bei einem heizungsbrenner

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE359639B (fr) * 1968-09-17 1973-09-03 Danfoss As
DE2033383B2 (de) * 1970-07-06 1977-12-08 Eckerle, Otto, 7502 Maisch Oelbrennerpumpe
DE3311438A1 (de) * 1982-06-04 1983-12-08 Sundstrand Corp., 61125 Rockford, Ill. Brennstoffzufuhrsystem fuer brenner mit ruecklauf

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3429779B2 (ja) 1996-11-02 2003-07-22 ヨット エーバーシュペッヘル ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディト ゲゼルシャフト エンジンとは無関係な車両暖房装置のための圧力噴霧化バーナ
DE10252640B3 (de) * 2002-11-11 2004-08-05 Danfoss A/S Ölbrenneranordnung

Also Published As

Publication number Publication date
DE4329955A1 (de) 1995-03-09
EP0715704B1 (fr) 1999-06-23
DE69419256T2 (de) 2000-02-17
EP0715704A1 (fr) 1996-06-12
DE69419256D1 (de) 1999-07-29
DE4329955C2 (de) 1997-01-16

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