WO2013080829A1 - ガスエンジンの副室ガス供給装置 - Google Patents
ガスエンジンの副室ガス供給装置 Download PDFInfo
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- WO2013080829A1 WO2013080829A1 PCT/JP2012/079975 JP2012079975W WO2013080829A1 WO 2013080829 A1 WO2013080829 A1 WO 2013080829A1 JP 2012079975 W JP2012079975 W JP 2012079975W WO 2013080829 A1 WO2013080829 A1 WO 2013080829A1
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- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/042—The valves being provided with fuel passages
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- 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
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/12—Engines characterised by precombustion chambers with positive ignition
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- 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
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
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- 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
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
- F02B19/1019—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber
- F02B19/108—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber
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- 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
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
- F02D19/021—Control of components of the fuel supply system
- F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/024—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
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- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
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- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
- F02M21/0239—Pressure or flow regulators therefor
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- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
- F02M21/026—Lift valves, i.e. stem operated valves
- F02M21/0269—Outwardly opening valves, e.g. poppet valves
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- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
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- 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
- F02B1/00—Engines characterised by fuel-air mixture compression
- F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
- F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
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- 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
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/22—Side valves
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- 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
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/34—Lateral camshaft position
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- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F2001/244—Arrangement of valve stems in cylinder heads
- F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
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- 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
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- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Definitions
- the present invention is applied to a gas engine having a sub chamber, and when the solenoid valve is opened to supply the fuel gas from the fuel gas supply source to the sub chamber, the fuel gas is supplied to the sub chamber by the opening time of the solenoid valve.
- the present invention relates to an auxiliary chamber gas supply device of a gas engine configured to be adjusted in quantity.
- Gas engines generally have an auxiliary chamber in addition to the main chamber as a combustion chamber. Then, the air-fuel mixture is ignited in the sub chamber to generate a torch flame, and the torch flame is jetted toward the main chamber to burn the air-fuel mixture in the main chamber.
- the auxiliary chamber is supplied with a mixture richer than the main chamber, and the fuel gas is supplied via a supply passage separate from the main chamber.
- FIG. 5 is a view showing the relationship between the opening / closing timing of the supply / exhaust valve and the in-cylinder pressure in the gas engine.
- opening the main chamber solenoid valve means that the main chamber solenoid valve for opening and closing the main chamber gas supply passage connecting the fuel supply source and the main chamber is opened.
- opening the sub-chamber solenoid valve means that the sub-chamber solenoid valve for opening and closing the sub-chamber gas supply passage connecting the fuel supply source and the sub-chamber is opened.
- the period in which the fuel gas can be supplied to the main chamber and the sub chamber is limited to a short period such as a suction stroke in which the pressure in the cylinder becomes low.
- the amount of fuel gas supplied to the sub chamber is adjusted by a short time during which the sub chamber solenoid valve is opened.
- the variation in the amount of fuel gas supplied due to the individual differences of the solenoid valve described above is particularly problematic when the fuel gas is supplied to the sub chamber. That is, since the volume of the sub chamber is smaller than that of the main chamber and the time for which the solenoid valve is opened is short, the variation in valve opening / closing speed greatly affects the variation in fuel gas supply amount. If the fuel gas supply amount varies, for example, if the fuel gas supply amount is smaller than the standard, combustion may become unstable. On the other hand, if the amount of combustion gas supplied is larger than the standard, the fuel efficiency may be deteriorated. In addition, when the combustion gas supply amount varies among the plurality of cylinders, the performance of the entire engine may be degraded.
- This invention is an invention made in view of such a subject of prior art, Comprising: In the subchamber gas supply apparatus of the gas engine which supplies fuel gas to a subchamber, the fuel to the subchamber resulting from the individual difference of a solenoid valve It is an object of the present invention to provide a gas engine auxiliary chamber gas supply device capable of suppressing variation in gas supply amount and achieving stable combustion of the gas engine and improvement of engine performance.
- the subchamber gas supply apparatus for gas engine of the present invention is A main chamber defined between the piston and the cylinder head, a sub chamber in communication with the main chamber via the injection hole, and a sub chamber gas supply passage for supplying a fuel gas to the sub chamber;
- the sub-chamber gas supply passage is connected to a fuel gas supply source via a solenoid valve, and when the solenoid valve is opened, a quantity of fuel gas corresponding to the opening time of the solenoid valve is the fuel gas supply source.
- a gas engine subchamber gas supply device configured to be supplied to the subchamber from the subchamber through the subchamber gas supply passage,
- the opening time of the solenoid valve is set so that a predetermined amount of fuel gas is supplied to the sub chamber, and the sub chamber gas supply passage has a throttle portion for extending the opening time of the solenoid valve. It is characterized in that it is formed.
- the opening time of the solenoid valve is set so that a predetermined amount of fuel gas is supplied to the sub chamber, and the throttling portion which extends the opening time of the solenoid valve to the sub chamber gas supply passage. Is formed. That is, the opening time of the solenoid valve is extended by an amount corresponding to a decrease in the amount of fuel gas supplied per unit time by the throttling portion. For this reason, in the present invention, the opening time of the solenoid valve is longer than that of the conventional gas engine sub-chamber gas supply device in which the throttle portion is not formed. And thereby, the variation of the fuel gas supply amount resulting from the variation of the opening / closing speed of a solenoid valve can be made small, and stable combustion of a gas engine and improvement of engine performance can be aimed at.
- the narrowed portion be an orifice formed in the sub-chamber gas supply passage.
- the narrowed portion includes a check valve disposed in the sub-chamber gas supply passage, and a flow coefficient of the check valve is in a range of 0.05 to 0.3.
- the check valve installed in the sub-chamber gas supply passage is configured as the throttling portion.
- the throttling portion extends the opening time of the solenoid valve by reducing the amount of fuel gas supplied per unit time. Therefore, a check valve having a large flow coefficient (a flow coefficient of 0.3 or more) is not included in the throttling portion in the present invention.
- the sub-chamber gas supply device for a gas engine that supplies fuel gas to the sub-chamber variations in the amount of fuel gas supplied to the sub-chamber due to individual differences of the solenoid valve can be suppressed. It is possible to provide a gas engine sub-chamber gas supply system capable of achieving stable combustion of the engine and improvement of engine performance.
- FIG. 2 is a cross-sectional view around a sub chamber of a gas engine provided with the sub chamber gas supply device of the first embodiment. It is a figure showing the iris diaphragm part of a 1st embodiment. In this invention, it is a figure for demonstrating the effect of setting the open time of an auxiliary chamber solenoid valve long. It is sectional drawing around the subchamber of the gas engine provided with the subchamber gas supply apparatus of 2nd Embodiment.
- FIG. 5 is a view showing the relationship between the opening / closing timing of the supply / exhaust valve and the in-cylinder pressure in the gas engine. It is a figure for demonstrating the relationship between the valve opening speed of an auxiliary chamber solenoid valve, and the quantity of the fuel gas supplied.
- FIG. 1 is a cross-sectional view around a sub chamber of a gas engine provided with the sub chamber gas supply device of the first embodiment.
- FIG. 1 the whole structure of the subchamber gas supply apparatus of the gas engine of 1st Embodiment is demonstrated.
- a main chamber 60 which is a main combustion chamber is defined between a piston (not shown) and the cylinder head 1.
- the auxiliary chamber cap 2 is fixed to the upper portion of the cylinder head 1 by the water chamber 1a, and the auxiliary chamber 4 (the center of the auxiliary chamber 4 is represented by 4a) is formed inside the auxiliary chamber cap 2 It is done.
- the sub chamber 4 is in communication with the main chamber 60 via the injection hole 3.
- the upper surface of the sub-chamber base 2 is fixed to the cylinder head 1 by pressing the upper surface of the sub-chamber base 2 by the spark plug retainer 13 and the retainer 12. Further, the spark plug 10 is fixed in the spark plug holder 13 via a mounting seat surface.
- a bore-cool cooling hole 11 s and a check valve insertion hole 6 s are formed around the auxiliary chamber 4 of the spark plug retainer 13.
- the bore cool cooling holes 11s are formed from the lower bore cool horizontal holes 11a (inlet holes) through the plurality of bore cool vertical holes (longitudinal cooling holes) 11 parallel to the axial core 10a of the spark plug 10, It is configured to lead to the outlet hole) and is formed to surround the high temperature portion of the spark plug 10.
- the center 6a of the check valve insertion hole 6s is provided parallel to the center 10a of the spark plug 10, and is supported by the check valve holder 9 at the lower part of the check valve insertion hole 6s.
- a check valve 6 of 1 is installed. Then, by installing the first check valve 6, the inside of the check valve insertion hole 6s is defined in two spaces of the check valve upper chamber 28 and the check valve lower chamber 29; The check valve lower chamber 29 and the sub chamber 4 are communicated with each other by the communication hole 5.
- one end of the fuel inlet connector 14 a is connected to the side of the spark plug retainer 13 so that the fuel inlet passage 14 bored in the fuel inlet connector 14 a and the check valve upper chamber 28 communicate with each other.
- the fuel inlet connector 14a is formed separately from the spark plug retainer 13, screwed into the spark plug retainer 13, and fixed to the fuel gas inlet portion 14s.
- the other end of the fuel inlet connector 14 a is connected to the fuel gas supply source 24 via the sub chamber solenoid valve 23.
- the fuel gas supply source 24 is configured to discharge the fuel gas to the fuel inlet passage 14 at a substantially constant pressure.
- the discharge pressure is 0.08 to 0.09 Mpa in gauge pressure.
- a second check valve 22 is provided in the fuel inlet connector 14a between the sub chamber solenoid valve 23 and the fuel gas inlet 14s. Both the second check valve 22 and the above-described first check valve 6 allow only the flow from the fuel gas supply source 24 to the sub chamber 4, and the combustion gas flows back from the sub chamber 4. As a result, soot and the like are prevented from accumulating in the fuel inlet passage 14.
- a valve element normally urged in the valve closing direction by a spring or the like operates in the valve opening direction against the spring force by energizing the solenoid portion by energization. Is configured. Further, when the energization is stopped, the valve body is operated in the valve closing direction by the spring force.
- the input of the open / close signal to the auxiliary chamber solenoid valve 23, that is, the on / off of the energization is controlled based on the signal of a crank angle sensor (not shown).
- the throttling portion 30 is formed between the sub-chamber solenoid valve 23 and the second check valve 22.
- the throttling portion 30 of the present embodiment is configured of an orifice 30a.
- Orifice diameter d 0 of the orifice 30a is a pore diameter and length of the fuel inlet passage 14, somewhat different due supply pressure of the fuel gas in the fuel gas supply source, against the tube diameter d 1 of the fuel inlet passage 14 1/5 The range of 1/9 is preferable.
- the extension of the fuel inlet passage 14 in the present embodiment is about 300 mm.
- the solenoid portion is excited.
- the valve body is opened so that the fuel gas flows out of the fuel gas supply source 24 into the fuel inlet passage 14.
- the fuel gas that has flowed out flows into the check valve upper chamber 28 through the fuel gas inlet 14s and from the check valve lower chamber 29 flows into the sub chamber 4 through the communication hole 5.
- the fuel inlet passage 14, the check valve upper chamber 28, the check valve lower chamber 29, and the communication hole 5 constitute the sub-chamber gas supply passage of the present invention for supplying the fuel gas to the sub-chamber 4. .
- the standard amount of fuel gas to be supplied to the sub chamber 4 is calculated from the volume of the sub chamber 4 and the mixture concentration of the main chamber 60 and the like.
- the amount of fuel gas supplied to the sub chamber 4 is adjusted by the time during which the sub chamber solenoid valve 23 is opened. Then, the sub-chamber gas supply device of the gas engine according to the present embodiment reduces the amount of fuel gas per unit time flowing into the sub-chamber 4 by forming the above-mentioned orifice 30a, whereby the sub-chamber electromagnetics are generated.
- the opening time of the valve 23 can be set to be long.
- the opening time of the solenoid valve in the embodiment where the opening time of the solenoid valve is long when the valve opening speed is larger than the standard, the amount of fuel gas flowing per unit time is small. As compared with the comparative example in which the open time of the valve is short, the excess of the fuel gas due to the variation of the valve opening speed is smaller. Further, as shown in FIG. 3 (C), in the embodiment where the opening time of the solenoid valve is long when the valve opening speed is smaller than the standard, the amount of fuel gas flowing per unit time is small. Compared to the comparative example in which the open time of the valve is short, the shortage of fuel gas due to the variation of the valve opening speed is reduced.
- the opening time of the sub-chamber solenoid valve 23 is set so that a predetermined amount of fuel gas is supplied to the sub-chamber 4, and the sub-chamber solenoid valve 23 A throttle portion 30 is formed to extend the open time of the That is, the opening time of the sub-chamber solenoid valve is extended by the amount by which the supply amount of the fuel gas per unit time decreases by the throttle unit 30.
- the opening time of the auxiliary chamber solenoid valve 23 is longer than in the auxiliary chamber gas supply device of the conventional gas engine in which the narrowed portion 30 is not formed. And thereby, the variation of the fuel gas supply amount resulting from the variation of the opening-closing speed of the subchamber solenoid valve 23 can be made small, and stable combustion of a gas engine and improvement of engine performance can be aimed at.
- the narrowed portion 30 is an orifice 30a formed in the sub-chamber gas supply passage.
- the narrowed portion can be formed in the sub-chamber gas supply passage with a simple configuration.
- the throttling portion by such an orifice 30a can be easily formed retrofit to the existing gas engine sub-chamber gas supply device, the configuration of the existing gas engine sub-chamber gas supply device It is possible to form the throttling portion without major changes.
- FIG. 4 is a cross-sectional view around a sub chamber of a gas engine provided with the sub chamber gas supply device of the second embodiment.
- the second embodiment basically has the same configuration as that of the first embodiment described above, and the same components as those in the first embodiment are denoted by the same reference numerals, and the detailed description thereof will be omitted. .
- the narrowed portion including the orifice 30a is not formed, and instead, the second non-return valve is used.
- the point in which the valve 22 'is configured as a throttle 30 differs from the embodiment described above.
- the flow coefficient (Cv) of the valve is in the range of 0.05 to 0.3, and the auxiliary chamber gas supply of a general gas engine The flow coefficient is smaller than the non-return valve (flow coefficient is 0.3 to 0.9) used in the device. Therefore, it also acts as the throttle unit 30 that reduces the pressure of the fuel gas.
- Cv the flow coefficient (Cv) of the valve.
- Cv Q ⁇ ⁇ (G / ⁇ P / 2) / A (1)
- Q is the flow rate
- G is the specific gravity of the fluid
- ⁇ P is the differential pressure across the valve
- A is the cross-sectional area
- the opening time of the sub-chamber solenoid valve 23 is extended by the formation of the throttling portion 30. Variations in the amount of supplied fuel gas due to variations in opening / closing speed are reduced, and stable combustion of the gas engine and improvement of engine performance can be achieved. Also, by installing a check valve with a flow coefficient in the range of 0.05 to 0.3 as a second check valve 22 'in the sub-chamber gas supply passage, the second check valve 22' is throttled.
- the unit 30 can be configured.
- auxiliary chamber gas supply device for a gas engine having an auxiliary chamber.
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- General Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
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Abstract
Description
本発明のガスエンジンの副室ガス供給装置は、
ピストンとシリンダヘッドとの間に画定される主室と、該主室と噴孔を介して連通される副室と、該副室に燃料ガスを供給する副室ガス供給路と、を備え、
前記副室ガス供給路は電磁弁を介して燃料ガス供給源と接続されており、該電磁弁が開放されると、電磁弁の開放時間に応じた量の燃料ガスが、前記燃料ガス供給源から副室ガス供給路を通って副室へと供給されるように構成されたガスエンジンの副室ガス供給装置において、
前記電磁弁は、前記副室に所定量の燃料ガスが供給されるようにその開放時間が設定されており、前記副室ガス供給路には、前記電磁弁の開放時間を延長せしめる絞り部が形成されていることを特徴とする。
本発明をこのように構成することで、簡単な構成で、副室ガス供給路に絞り部を形成することができる。また、このようなオリフィスによる絞り部は、既存のガスエンジンの副室ガス供給装置に対して、後付けで簡単に形成することができるため、既存のガスエンジンの副室ガス供給装置の構成を大きく変更することなく、絞り部を形成することが可能となる。
このように、流量係数が0.05~0.3の範囲の逆止弁を副室ガス供給路に設置することで、副室ガス供給路に設置する逆止弁を絞り部として構成することができる。なお、本発明において絞り部とは、上述したように、燃料ガスの単位時間当たりの供給量を減少させることで、電磁弁の開放時間を延長せしめるものである。よって、流量係数の大きい逆止弁(流量係数が0.3以上)は本発明でいうところの絞り部には含まれないものとする。
ただし、本発明の範囲は以下の実施形態に限定されるものではない。以下の実施形態に記載されている構成部品の寸法、材質、形状、その相対配置などは、特に記載がない限り、本発明の範囲をそれにのみ限定する趣旨ではなく、単なる説明例に過ぎない。
図1は、第1の実施形態の副室ガス供給装置を備えたガスエンジンの副室周りの断面図である。まず、図1を参照して、第1の実施形態のガスエンジンの副室ガス供給装置の全体構成について説明する。
次に、本発明の第2の実施形態について、図4を基に説明する。図4は、第2の実施形態の副室ガス供給装置を備えたガスエンジンの副室周りの断面図である。なお、この第2の実施形態は、上述した第1の実施形態と基本的には同様の構成になっており、同一の構成部材には同一の符号を付し、その詳細な説明を省略する。
Cv=Q×√(G/ΔP/2)/A ・・・ (1)
(ここに、Qは流量、Gは流体の比重、ΔPは弁前後の差圧、Aは断面積である)
また、第2の逆止弁22´として、流量係数が0.05~0.3の範囲の逆止弁を副室ガス供給路に設置することで、第2の逆止弁22´を絞り部30として構成することができる。
Claims (3)
- ピストンとシリンダヘッドとの間に画定される主室と、該主室と噴孔を介して連通される副室と、該副室に燃料ガスを供給する副室ガス供給路と、を備え、
前記副室ガス供給路は電磁弁を介して燃料ガス供給源と接続されており、該電磁弁が開放されると、電磁弁の開放時間に応じた量の燃料ガスが、前記燃料ガス供給源から副室ガス供給路を通って副室へと供給されるように構成されたガスエンジンの副室ガス供給装置において、
前記電磁弁は、前記副室に所定量の燃料ガスが供給されるようにその開放時間が設定されており、前記副室ガス供給路には、前記電磁弁の開放時間を延長せしめる絞り部が形成されていることを特徴とするガスエンジンの副室ガス供給装置。 - 前記絞り部が、前記副室ガス供給路に形成されたオリフィスであることを特徴とする請求項1に記載のガスエンジンの副室ガス供給装置。
- 前記絞り部が、副室ガス供給路に設置された逆止弁を含み、該逆止弁の流量係数が0.05~0.3の範囲であることを特徴とする請求項1または2に記載のガスエンジンの副室ガス供給装置。
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EP12854267.7A EP2787192A4 (en) | 2011-11-30 | 2012-11-19 | AUXILIARY CHAMBER DELIVERY DEVICE FOR GAS ENGINE |
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US14/360,882 US9581119B2 (en) | 2011-11-30 | 2012-11-19 | Auxiliary chamber gas supplying device for gas engine |
KR1020167014528A KR101746360B1 (ko) | 2011-11-30 | 2012-11-19 | 가스 엔진의 부실 가스 공급 장치 |
CN201280057286.6A CN104136732B (zh) | 2011-11-30 | 2012-11-19 | 燃气发动机的副室气体供给装置 |
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JP6630576B2 (ja) | 2016-01-21 | 2020-01-15 | 三菱重工エンジン&ターボチャージャ株式会社 | 副室式ガスエンジン及びその運転制御方法 |
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