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
  • F23K5/04—Feeding or distributing systems using pumps
• • 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
  • F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
• • 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
• • 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
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N1/00—Regulating fuel supply
  • F23N1/005—Regulating fuel supply using electrical or electromechanical means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N1/00—Regulating fuel supply
  • F23N1/007—Regulating fuel supply using mechanical means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N5/00—Systems for controlling combustion
  • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
  • F23N5/247—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using mechanical means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
  • B60H2001/2268—Constructional features
  • B60H2001/2284—Fuel supply
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N2235/00—Valves, nozzles or pumps
  • F23N2235/30—Pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N2239/00—Fuels
  • F23N2239/06—Liquid fuels
• • 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 invention relates to a heating device operated with liquid fuel referred to in the preamble of claim 1 and a suitable for such a heater fuel pump.
• the term "line” refers to all types of cavities and hollow bodies which are able to serve as a flow path for a fluid, in particular a liquid, and which for this purpose have at least one inlet and at least one outlet opening. These include next to pipelines eg through holes in any Au datedform having solids, channels, which are closed on all sides except for access and exit openings, etc. ..
• the term "line area” several such flow-connected or connectable lines understood that also with one or more blind-hole-like, ie only a connection opening having holes or depressions may be connected, which are designed for receiving and storing a fluid, in particular a liquid.
• the heaters discussed here come either in the form of heaters or heating systems that are installed in passenger cars, buses, rail vehicles and the like and used to heat the interiors of these vehicles or for preheating the radiator water, for example, diesel engines, or as fixed heating systems, for example Heating buildings used.
• They include a fuel pump, with the aid of which the liquid fuel is sucked from a reservoir or tank and fed to a pressure line region in which a defined by a pressure regulator or pressure limiter, increased pressure prevails and flows out of the fuel to a spray nozzle, through which it is injected to form a burner flame in a burner chamber.
• a shut-off device e.g. be designed as a magnetic shut-off valve and can be closed to interrupt the fuel supply to the atomizer.
• This operating phase in which the shut-off device is closed so that no fuel can reach the atomizer nozzle and exit from it, serves to build up the required operating pressure in the pressure line region. Too much subsidized fuel, which the pressure line area can no longer absorb, is returned by means of the pressure regulator via a branching from the pressure line area return line into the tank. b) Heating operation
• the shut-off device is opened, it emerges fuel from the atomizer and forms after ignition in the burner chamber serving for heating flame.
• an overfeed must take place, ie the pump must supply more fuel to the pressure line area during heating operation than exits through the atomizer nozzle Fuel returns to the tank via the return line c)
• shut-off device In this phase of operation the shut-off device is closed again, no fuel escapes from the atomizer nozzle and the flame is extinguished. For cooling but run the fan and with him the fuel pump on. The pumped fuel flows back to the tank via the return line.
• the amount of suction-side negative pressure generated by the fuel pump depends on numerous factors, such as e.g. the components in the intake manifold (including fuel filter), the length of the intake manifold, the pump speed, the temperature of the viscosity of the fuel being pumped, etc.
• Gas bubbles of various sizes can occur in the fuel delivered in the intake system because, when the negative pressure reaches certain values, the fuel evaporates and / or there are leaks in the fuel system for the ingress of air bubbles, and / or because of Storage tank formed gas bubbles are sucked.
• the gaseous constituents account for a certain proportion of the total volume delivered by the pump, in conjunction with the pressure regulator, it can result in both a significant pressure drop in the downstream of the displacer the pump lying pressure line area as well as a suspension of the delivery of the fuel come.
• a disadvantage of these remedial measures is that additional components must be used, which significantly increase the production costs for such a system.
• the invention has the object, a heating device of the type mentioned in such a way that gas bubbles that are sucked by the fuel pump with the fuel, not or at least far less often than in the prior art lead to failure of the heater.
• the at least one additional volume effecting this stabilization of the heating process can be assigned to the part of the pressure line region between the displacer of the fuel pump, the shut-off device and the pressure regulator if a shut-off device for interrupting the fuel supply to the atomizer nozzle is provided in the pressure line region.
• the additional volume or the additional volumes can be assigned to the respective part of the pressure line region either by extending already existing line sections and / or by increasing their cross-section.
• An alternative is to connect short and small cross-section formed, pressure-side line sections via a branch line with a storage or storage chamber for the pressurized fuel.
• the size of the inventively provided additional volume or additional volumes, which is required to achieve the effect of reducing and shortening a occurring during the suction of gas bubbles pressure drop on the pressure side of the fuel pump depends in a particular case on a number of factors, such as in the regular operation of the fuel Pump per unit time to be delivered fuel volume, the ratio of line volume on the suction side to that on the pressure side of the fuel pump, etc., can be determined by the skilled person but readily by appropriate tests.
• Figure 1 is a schematic representation of a heating device according to the invention, in which the additional volumes are formed by extension and / or extension of already existing line areas, and
• Fig. 2 is a schematic representation of a heating device according to the invention, in which the additional volumes are formed as additional storage chambers, which are connected by branch lines with the already existing line sections.
• a fuel pump 1 is shown, the displacer 2 is driven by a motor 3 and although it is preferably a gear pump, which may alternatively be but any other type of pump.
• the engine 3 can either be an independent unit or integrated into the fuel pump 1 as shown.
• the fuel pump 1 sucks fuel from a fuel tank 6 via an intake pipe 4, as indicated by the arrow S.
• a pump-internal line 7 leads to a shut-off valve 8 designed as a shut-off device, to which a further line 9 connects, which supplies the fuel to a spray nozzle 10 through which it into a (not shown ) Combustion chamber is injected to be burned there in a flame 1 1.
• the check valve 8 is actuated via an electromagnet 12 and serves to be closed when no heating operation is running.
• the prevailing in the lines 7 and 9 pressure which may be in the above-mentioned pumps of the Applicant typically in a range of 9 to 10 bar is defined by an adjustable pressure regulator 14, the return from the fuel pump 1 to a return line 16 returns much funded fuel in the fuel tank 6, as indicated by the arrow R.
• the return line 16 instead of opening into the fuel tank 6 in the intake passage 4, as indicated by the dotted line 17 (Single line system).
• the leading into the fuel tank 6 branch of the return line 16 is omitted in this case.
• shut-off valve 8 the solenoid 12 serving to actuate it, and the pressure regulator are integrated into the fuel pump 1, i. shown assembled with the pump body, while the generally mounted on a (non-illustrated) nozzle assembly scrubber pump 10 to the fuel pump 1 has a slightly greater distance.
• At least one additional volume 20, 22 is provided beyond the minimum volume required for the fluid connection of all these components, which is assigned to the parts of the pressure line area that are between the displacer 2 of the fuel pump 1, the pressure regulator 14 and the shut-off valve 8 and / or between the shut-off valve 8 and the atomizer nozzle 10.
• Fig. 2 shows additional volumes 24, 26 which are connected by branch lines 27, 29 with the lines 7 and 9 and thus are not directly in the flow paths from the displacer 2 of the fuel pump 1 to the check valve 8 and from this to the atomizer 10 lead.
• additional volumes 24, 26 can also be arranged inside the pump and / or outside the pump, depending on the specific circumstances of the individual case, and can be combined with the additional volumes 20, 22 in any desired manner.
• the total size of the additional volume (s) 20, 22, 24, 26 may preferably be more than 100 mm 3 , particularly preferably more than 200 mm 3 and very particularly preferably more than 400 mm 3 , or in a range of 10% to 60%. , more preferably from 20% to 50% and most preferably from 30% to 40% of the minimum volume required to connect the components located on the pressure side of the displacer 2 of the fuel pump 2 in any case required.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Feeding And Controlling Fuel (AREA)
• Nozzles (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=49170655

Family Applications (1)

Country Status (7)

Families Citing this family (5)

Citations (3)

Family Cites Families (9)

• 2012
  • 2012-10-23 DE DE102012110103.5A patent/DE102012110103A1/de not_active Ceased
• 2013
  • 2013-08-02 CA CA2886415A patent/CA2886415C/en not_active Expired - Fee Related
  • 2013-08-02 US US14/428,063 patent/US20150247638A1/en not_active Abandoned
  • 2013-08-02 RU RU2015110599A patent/RU2670642C9/ru not_active IP Right Cessation
  • 2013-08-02 WO PCT/EP2013/066303 patent/WO2014063845A1/de active Application Filing
  • 2013-08-02 EP EP13762412.8A patent/EP2912376A1/de not_active Withdrawn
  • 2013-08-02 CN CN201380052446.2A patent/CN104736933B/zh active Active

Patent Citations (3)

Non-Patent Citations (1)

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