EP0653017B1 - Arrangement of internal combustion engines provided with a supercharger and a fuel injection system - Google Patents

Arrangement of internal combustion engines provided with a supercharger and a fuel injection system Download PDF

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Publication number
EP0653017B1
EP0653017B1 EP93910524A EP93910524A EP0653017B1 EP 0653017 B1 EP0653017 B1 EP 0653017B1 EP 93910524 A EP93910524 A EP 93910524A EP 93910524 A EP93910524 A EP 93910524A EP 0653017 B1 EP0653017 B1 EP 0653017B1
Authority
EP
European Patent Office
Prior art keywords
supercharger
outlet port
outlet
pressure
port
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 - Lifetime
Application number
EP93910524A
Other languages
German (de)
French (fr)
Other versions
EP0653017A1 (en
Inventor
Johnny Oscarsson
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.)
Opcon Autorotor AB
Original Assignee
Opcon Autorotor AB
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Filing date
Publication date
Application filed by Opcon Autorotor AB filed Critical Opcon Autorotor AB
Publication of EP0653017A1 publication Critical patent/EP0653017A1/en
Application granted granted Critical
Publication of EP0653017B1 publication Critical patent/EP0653017B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/32—Engines with pumps other than of reciprocating-piston type
    • F02B33/34—Engines with pumps other than of reciprocating-piston type with rotary pumps
    • F02B33/36—Engines with pumps other than of reciprocating-piston type with rotary pumps of positive-displacement type
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type

Definitions

  • the present invention relates to a device in internal combustion engines provided with a supercharger of the rotary screw compressor type and a compressed air assisted fuel injection system, in which the supercharger includes a casing provided with outlet and inlet end walls with inlet port and outlet port and two rotors, one being a male rotor and the other one a female rotor, which have helically extending lobes and intermediate grooves, the intermeshing lobes of the rotor and the casing forming towards the outlet end wall movable chambers with an overpressure of about 1 to 2 bars as the rotors rotate.
  • a pressure source of a relatively high pressure such as about 5 bars overpressure is required in order to attain an adequate injection.
  • the injection must take place so fast that the fuel has to be mixed with and injected with the compressed air.
  • a suitably driven compressor e.g. a small reciprocating compressor is provided irrespective of if the engine is supercharged or not.
  • the motor is supercharged with a compressor this means mounting of further a component in connection with the engine with increasing costs as a consequence.
  • a compressor for this purpose is known by EP-A-0 458 670 disclosing a screw compressor providing air at two different pressures, the higher of which is used to assist the injection of fuel. If an air pressure of about 5 bar is requested for assisting the injection of fuel two screw compressors are preferably used in series connection.
  • the object of the invention is to attain a corresponding function for the fuel injection of a supercharged engine without the requirement to provide a particular compressor for the fuel injection.
  • fig. 1 is a view from above of an engine with supercharger and fuel injection device
  • fig. 2 is an end view of a first embodiment of the device according to the invention
  • fig. 3 is an end view of a second embodiment for achieving a particularly high pressure ratio and a larger air quantity.
  • Fig. 1 shows an internal combustion engine 1 provided with a supercharger 2 of the rotary screw compressor type, driven by a belt transmission 3 from a pulley mounted on the engine crankshaft.
  • the supercharger 2 feeds the intake manifold 4 of the engine through a channel 5 with an overpressure of about 1 bar.
  • the supercharger 2 is provided with a high pressure outlet 6 for compressed air, which will be described in connection with figs. 2 and 3. From the high pressure outlet 6 compressed air with a pressure of about 5 bars is led through a compressed air pipe 7 to a fuel injection device 8, which receives fuel from a pipe 9.
  • the fuel is mixed with the compressed air in the fuel injection device 8 and is supplied to the intake manifold 4 alternatively the cylinder of the engine (at direct fuel injection) through injection nozzles.
  • the supercharger is of a kind known by US-A-2 111 568, namely a rotary screw compressor with a special outlet port 11, fig. 2, provided in the compressor casing, for emptying the air volume enclosed between the rotors and therethrough eliminating the powerful pressure pulses, that can occur after closing of the outlet port.
  • the port is here very small and located in a part of the outlet end wall 12 in a position such that the air volume enclosed between the rotors at the outlet end after a final compression will be located to face the port when the desired pressure level has been reached.
  • Fig. 2 also shows the ordinary axial outlet port 13 of the compressor, formed by the axial outlet port 13F and 13M in the outlet end wall.
  • the port thus is formed by two port sections, divided by the end wall part 12 with the flanks of the female rotor 14F and the male rotor 14M nearest to the end wall part 12 indicated by dotted lines.
  • the radial outlet port 15 of the supercharger is projected with a for a supercharger normal opening edge 16 and an early acting closing edge 17 for the compression of high pressure air.
  • the position of the closing edge 17 is chosen with regard to the desired quantity of high pressure air, which naturally makes use of a corresponding part of the capacity of the supercharger. This air quantity, however, will be supplied to the engine together with the fuel.
  • a recess 20 can be provided in each groove of the female rotor 14F adjacent to the outlet end wall 12 and in that port 21, located such that communication with the recess 20 is established, when the desired pressure has been reached.

Abstract

The invention relates to a device in internal combustion engines provided with a supercharger (2) of the rotary screw compressor type and a compressed air assisted fuel injection system (8, 9, 10). According to the invention a rotary screw compressor (2) of a kind known as such is used as the supercharger, which compressor through a special, from the ordinary outlet port (13) separated, outlet port (21) delivers a minor air flow of high pressure after closing of the ordinary outlet port, which special port (21) by a pressure pipe (7) is connected to the fuel injection system (8, 9, 10) for pressurizing this.

Description

  • The present invention relates to a device in internal combustion engines provided with a supercharger of the rotary screw compressor type and a compressed air assisted fuel injection system, in which the supercharger includes a casing provided with outlet and inlet end walls with inlet port and outlet port and two rotors, one being a male rotor and the other one a female rotor, which have helically extending lobes and intermediate grooves, the intermeshing lobes of the rotor and the casing forming towards the outlet end wall movable chambers with an overpressure of about 1 to 2 bars as the rotors rotate.
  • In many engine constructions with fuel injection direct into the combustion chamber or alternatively into the intake manifold a pressure source of a relatively high pressure, such as about 5 bars overpressure is required in order to attain an adequate injection. In some cases the injection must take place so fast that the fuel has to be mixed with and injected with the compressed air. For this purpose a suitably driven compressor, e.g. a small reciprocating compressor is provided irrespective of if the engine is supercharged or not. In the case the motor is supercharged with a compressor this means mounting of further a component in connection with the engine with increasing costs as a consequence.
  • A compressor for this purpose is known by EP-A-0 458 670 disclosing a screw compressor providing air at two different pressures, the higher of which is used to assist the injection of fuel. If an air pressure of about 5 bar is requested for assisting the injection of fuel two screw compressors are preferably used in series connection.
  • The object of the invention is to attain a corresponding function for the fuel injection of a supercharged engine without the requirement to provide a particular compressor for the fuel injection.
  • This has according to the invention been achieved in that a rotary screw compressor of a kind known as such is used as the supercharger, which compressor through a special, from the ordinary outlet port separated, outlet port delivers a minor air flow of considerably higher pressure than that from the ordinary outlet port of the compressor after that the ordinary outlet port has been closed, which special outlet port by a pipe is connected to the fuel injection system for pressurizing this with a considerably higher pressure than the outlet pressure of the supercharger. In this way the air volume enclosed between the rotors and the casing at the outlet end after final compression can be withdrawn at the desired pressure level and be used for the fuel injection. In an internal combustion engine with a rotary screw compressor as supercharger and in which fuel injection with the aid of compressed air is required, an extra compressor or pump for the fuel injection thus is not necessary.
  • The invention is explained in detail through the following with reference to the accompanying drawing, schematically showing two embodiments of devices according to the invention, wherein fig. 1 is a view from above of an engine with supercharger and fuel injection device, fig. 2 is an end view of a first embodiment of the device according to the invention and fig. 3 is an end view of a second embodiment for achieving a particularly high pressure ratio and a larger air quantity.
  • Fig. 1 shows an internal combustion engine 1 provided with a supercharger 2 of the rotary screw compressor type, driven by a belt transmission 3 from a pulley mounted on the engine crankshaft. The supercharger 2 feeds the intake manifold 4 of the engine through a channel 5 with an overpressure of about 1 bar. The supercharger 2 is provided with a high pressure outlet 6 for compressed air, which will be described in connection with figs. 2 and 3. From the high pressure outlet 6 compressed air with a pressure of about 5 bars is led through a compressed air pipe 7 to a fuel injection device 8, which receives fuel from a pipe 9. The fuel is mixed with the compressed air in the fuel injection device 8 and is supplied to the intake manifold 4 alternatively the cylinder of the engine (at direct fuel injection) through injection nozzles.
  • The supercharger is of a kind known by US-A-2 111 568, namely a rotary screw compressor with a special outlet port 11, fig. 2, provided in the compressor casing, for emptying the air volume enclosed between the rotors and therethrough eliminating the powerful pressure pulses, that can occur after closing of the outlet port. The port is here very small and located in a part of the outlet end wall 12 in a position such that the air volume enclosed between the rotors at the outlet end after a final compression will be located to face the port when the desired pressure level has been reached. Fig. 2 also shows the ordinary axial outlet port 13 of the compressor, formed by the axial outlet port 13F and 13M in the outlet end wall. The port thus is formed by two port sections, divided by the end wall part 12 with the flanks of the female rotor 14F and the male rotor 14M nearest to the end wall part 12 indicated by dotted lines. Straight below the port 13F, 13M the radial outlet port 15 of the supercharger is projected with a for a supercharger normal opening edge 16 and an early acting closing edge 17 for the compression of high pressure air. The position of the closing edge 17 is chosen with regard to the desired quantity of high pressure air, which naturally makes use of a corresponding part of the capacity of the supercharger. This air quantity, however, will be supplied to the engine together with the fuel.
  • If a particularly high pressure is desired, a recess 20 can be provided in each groove of the female rotor 14F adjacent to the outlet end wall 12 and in that port 21, located such that communication with the recess 20 is established, when the desired pressure has been reached.
  • In this way normally about 5 % of the capacity of the supercharger can be made use of for compressed air to the fuel injection at an overpressure of about 5 bars. Due to the higher pressure, leakage will increase somewhat and therefore the supercharger should be dimensioned with regard to that.

Claims (2)

  1. Internal combustion engine provided with a supercharger (2) of the rotary screw compressor type and a compressed air assisted fuel injection system (8, 9, 10), in which the supercharger includes a casing provided with outlet and inlet end walls with inlet port and outlet port (13, 15) and two rotors (14), one being a male rotor (14M) and the other one a female rotor (14F), which have helically extending lobes and intermediate grooves, the intermeshing lobes of the rotors and the casing forming towards the outlet end wall movable chambers as the rotors rotate, wherein a rotary screw compressor (2) is used as the supercharger, and is provided with a special, from the ordinary outlet port (13, 15) separated, outlet port (11, 21) creating a pressure that differs from the ordinary outlet pressure, characterized in that said special outlet port (11, 21) is located in the outlet end wall (12) in a position such that the air volume enclosed by the rotors at the outlet end after final compression will be located to face the special outlet port (11, 21) when the desired pressure level is reached delivers a minor air flow of considerably higher pressure than that delivered from the ordinary outlet port (13, 15) of the compressor after that the ordinary outlet port has been closed, which special outlet port (11, 21) by a pipe (7) is connected to the fuel injection system (8, 9, 10) for pressurizing this with a considerably higher pressure than the outlet pressure of the supercharger.
  2. Engine according to claim 1, characterized in that in the bottom of each groove of the female rotor (14F) adjacent to the outlet end wall (12) a narrow axially extending recess (20) is provided, which recesses at rotation of the rotors are arranged to one after another be brought in communication with the high pressure port (21) at a turning angle ofthe rotor when the pressure in the working chamber reaches the intended level.
EP93910524A 1992-05-14 1993-05-13 Arrangement of internal combustion engines provided with a supercharger and a fuel injection system Expired - Lifetime EP0653017B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9201526A SE9201526L (en) 1992-05-14 1992-05-14 Device for internal combustion engines equipped with a screw compressor type supercharger (2) and a compressed air assisted fuel injection system
SE9201526 1992-05-14
PCT/SE1993/000420 WO1993023659A1 (en) 1992-05-14 1993-05-13 Arrangement of internal combustion engines provided with a supercharger and a fuel injection system

Publications (2)

Publication Number Publication Date
EP0653017A1 EP0653017A1 (en) 1995-05-17
EP0653017B1 true EP0653017B1 (en) 1997-08-13

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ID=20386248

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Application Number Title Priority Date Filing Date
EP93910524A Expired - Lifetime EP0653017B1 (en) 1992-05-14 1993-05-13 Arrangement of internal combustion engines provided with a supercharger and a fuel injection system

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EP (1) EP0653017B1 (en)
DE (1) DE69313120T2 (en)
SE (1) SE9201526L (en)
WO (1) WO1993023659A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2008343380B2 (en) 2007-12-26 2012-07-12 Gen-Probe Incorporated Compositions and methods to detect Candida albicans nucleic acid
CN216429936U (en) * 2021-12-06 2022-05-03 李云峰 Air compression acting device and double-pressure jet engine thereof
US11802507B2 (en) 2021-12-06 2023-10-31 Yunfeng Li Dual-pressure jet engine and device for work done by compressed air thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2111568A (en) * 1935-02-12 1938-03-22 Lysholm Alf Rotary compressor
EP0458670A1 (en) * 1990-05-21 1991-11-27 Institut Français du Pétrole Method of pneumatic fuel injection in a two-stroke engine and such a two-stroke engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2553561A1 (en) * 1975-11-28 1977-06-08 Joseph Gamell Ind Inc IC engine super charge system - in which compressor is rotated by turbine actuated by hydraulic pressure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2111568A (en) * 1935-02-12 1938-03-22 Lysholm Alf Rotary compressor
EP0458670A1 (en) * 1990-05-21 1991-11-27 Institut Français du Pétrole Method of pneumatic fuel injection in a two-stroke engine and such a two-stroke engine

Also Published As

Publication number Publication date
EP0653017A1 (en) 1995-05-17
SE470107B (en) 1993-11-08
WO1993023659A1 (en) 1993-11-25
DE69313120T2 (en) 1998-03-12
SE9201526D0 (en) 1992-05-14
SE9201526L (en) 1993-11-08
DE69313120D1 (en) 1997-09-18

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