Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M27/00—Apparatus for treating combustion-air, fuel, or fuel-air mixture, by catalysts, electric means, magnetism, rays, sound waves, or the like
  • F02M27/08—Apparatus for treating combustion-air, fuel, or fuel-air mixture, by catalysts, electric means, magnetism, rays, sound waves, or the like by sonic or ultrasonic waves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
  • F02M23/04—Apparatus for adding secondary air to fuel-air mixture with automatic control
  • F02M23/08—Apparatus for adding secondary air to fuel-air mixture with automatic control dependent on pressure in main combustion-air induction system, e.g. pneumatic-type apparatus
  • F02M23/09—Apparatus for adding secondary air to fuel-air mixture with automatic control dependent on pressure in main combustion-air induction system, e.g. pneumatic-type apparatus using valves directly opened by low pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
  • F02M23/12—Apparatus for adding secondary air to fuel-air mixture characterised by being combined with device for, or by secondary air effecting, re-atomising of condensed fuel
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/12—Improving ICE efficiencies

Definitions

• the present invention relates to a method and a device for atomising a liquid fuel during the supply thereof to a combustion chamber according to the preamble of claim 1 and claim 3, respectively.
• the object of the present invention therefore is to improve prior art methods and devices for atomising a liquid fuel durinq the supply thereof to a combustion chamber, and when using the invention, a liquid fuel should be mixed with a combustion-promoting gas and, in this connection, be set in high-frequency vibration, and the mixture should be conducted past an inwardly directed, peripheral edge in the chamber, and a secondary flow of combustion-promoting gas should be sucked into the chamb adjacent or immediately after this edge in an amount con trolled by the negative pressure ( "vacuum”) in the cha - ber, when the negative pressure in the chamber is lower than a settable limit value.
• a liquid fuel should be mixed with a combustion-promoting gas and, in this connection, be set in high-frequency vibration, and the mixture should be conducted past an inwardly directed, peripheral edge in the chamber, and a secondary flow of combustion-promoting gas should be sucked into the chamb adjacent or immediately after this edge in an amount con trolled by the negative pressure ( "vacuum") in the cha
• u is preferably made of a check valve whose degree of open ⁇ ing varies depending on the prevalent negative pressure the chamber and which is settable to a desired limit value.
• the intake of the secondary flow of combustion- supporting gas after the edge should thus occur in a con ⁇ trolled manner and in an amount which is dependent on the negative pressure prevailing in the chamber after this edge, the sucked-in air providing a redispersion of liqui fuel on the walls of the throughflow chamber.
• US-A-3,834,367 discloses the insertion of a flat plate after a carburettor, said plate forming a wall in the throughflow chamber and having inlet openings for taking in secondary air. This intake of secondary air occurs in a completely uncontrolled manner and is not affected by anything else but the engine speed and load.
• German publication DE-A-3,411,094 discloses a device for supplying secondary air to the intake duct of an Ot o engine.
• the supplied amount of secondary ai is controlled by a throttle valve whose degree of opening is regulated by a separate regulating means in such a man ⁇ ner that the throttle valve is closed when idling and open at full speed.
• this device operates quite contrary to the device and the method according to the present invention.
• US-A-3,659,575 discloses a device for reducing the negative pressure in the intake manifold of an engine and supplying additional air to said engine.
• This device comprises a normally closed, spring-loaded one-way valve which is adapted to be controlled by the negative pressure in the manifold and which is substantially loaded by a constant counterforce means in the form of a weight and to a smaller extent by spring force, said valve being damped against vibrations.
• the additional air is introduced into the throughflow duct by a number of radially directed inlet apertures which open into the wall of the through- flow duct.
• the function of this prior art device is depen ⁇ dent on the mounted position of the device, and moreover it can be affected by inertia forces when the device is used in a vehicle engine. Further, the shown embodiments of this prior art device have no means for providing, in the manner according to the present invention, a redisper- sion of liquid fuel forming a film of liquid on the wall of the throughflow duct.
• the invention distinguishes from all prior art in that a combination is obtained of atomisation by vibration and intake of secondary air, controlled by negative pressure, after an inwardly directed flange for forced reatomisation of fuel which flows as a layer along the walls of the throughflow duct.
• Fig. 1 illustrates, partly in section, a secondary air supply plate in a first embodiment of the inventive device.
• Fig. 2 is a cross-sectional view along the line II-II in Fig. 1 and neighbouring portions of the through- flow chamber.
• Fig. 3 is a cross-sectional view, corre ⁇ sponding to the one in Fig. 2, of a second embodiment of the device according to the invention.
• a throughflow chamber 10 comprises a first section 11 and a second section 12 between which a secondary air supply plate 13 is inserte
• a fuel injection nozzle 14 extends into the throughflow chamber and is connected with a schematically shown vibr tion means 15 for setting the fuel nozzle in high-fre ⁇ quency vibration.
• us can be made of a stationary fuel injection nozzle togeth with a separate vibrator, the vibrating body of which extends in the throughflow chamber for setting the fuel- gas mixture in high-frequency vibration.
• the secondary air supply plate 13 forms an edge 16 which is inwardly directed in the throughflow chamber 10 and which breaks a film of liquid formed on the chamber wall and moving in the direction of the gas flow along th wall.
• edge 16 there is formed a peripheral recess 17 into which a secondary air inlet duct 18 opens substantially tangentially in order that the sucked-in ai should be set in a whirling motion for improving the redispersion of liquid fuel moving along the wall of the throughflow chamber in the form of a film of liquid.
• the secondary air inlet duct 18 is connected to a check valve means 19 which is mounted in a bore 20 in the plate 13.
• the check valve comprises a valve seat componen 21 which is screwable to different axial positions in the bore 20, thereby changing the position of the seat 22 of the check valve.
• a valve member 23 is contained in the check valve and is spring loaded in the direction of the seat 22 by a compression spring 24 resting against an annular abutment 25 in the bore 20.
• the secondary air is sucked in through an air cleaner 26, when the negative pressure in the throughflow chamber 10 exceeds a limit value which is settable by adjusting the bias of the spring 24 by varying the axial position of the valve seat component 21 in the bore 20.
• the embodiment according to Fig. 3 distinguishes fro the embodiment according to Figs.
• th recess 17 has been formed as a screw thread, so that the sucked-in secondary air, to an even higher extent, is set in a helical whirling motion for whirling the fuel and redispersion of liquid fuel moving along the wall of the throughflow chamber.
• the secondary air supply plate 13 does not form a drastic contraction in the throughflow chamber 10, since such a contraction would yield a pressure drop which, in turn, would result in a greater intake of secondary air and, thus, a leaner fuel-air mixture bringing the above-men ⁇ tioned drawbacks.
• the edge 16 of the plate 13 is aligned with the wall of the throughflow chamber or extends slightly beyond this, so that a peripheral (pos ⁇ sibly helical) groove is formed adjacent the plate. Expe ⁇ riments have shown that the best results are obtained in these cases, but that a slight projection (1-2 mm at most) can be tolerated.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Exhaust Gas After Treatment (AREA)
• Fuel-Injection Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20381340

Family Applications (1)

Country Status (3)

Citations (4)

• 1990
  • 1990-12-28 SE SE9004180A patent/SE467704C/sv not_active IP Right Cessation
  • 1990-12-28 SE SE9004180D patent/SE9004180L/sv not_active Application Discontinuation
• 1991
  • 1991-12-27 WO PCT/SE1991/000908 patent/WO1992012340A1/en active Application Filing
  • 1991-12-27 AU AU91243/91A patent/AU9124391A/en not_active Abandoned

Patent Citations (4)

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