WO2012043655A1 - ガス噴射弁 - Google Patents
ガス噴射弁 Download PDFInfo
- Publication number
- WO2012043655A1 WO2012043655A1 PCT/JP2011/072239 JP2011072239W WO2012043655A1 WO 2012043655 A1 WO2012043655 A1 WO 2012043655A1 JP 2011072239 W JP2011072239 W JP 2011072239W WO 2012043655 A1 WO2012043655 A1 WO 2012043655A1
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- WIPO (PCT)
- Prior art keywords
- valve
- gas
- needle valve
- valve body
- piston
- Prior art date
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Classifications
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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
- F02M21/0251—Details of actuators 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
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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
- F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
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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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- 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 relates to a gas injection valve.
- This application claims priority based on Japanese Patent Application No. 2010-217133 for which it applied to Japan on September 28, 2010, and uses the content here.
- FIG. 3 shows an example of a conventional gas injection valve used in a two-stroke gas engine.
- the gas injection valve includes a gas passage member 4, a needle valve 5, and a valve driving device 6.
- the gas passage member 4 sends the fuel gas G into the gas supply passage 1 through which the fuel gas G is fed from a fuel gas generator (not shown) and the cylinder liner (not shown) of the two-stroke gas engine.
- the sheet portion 3 having a circular opening 3 a that can communicate with both the passages 1 and 2 is incorporated between the passages 1 and 2.
- the needle valve 5 is disposed coaxially with the opening 3a above the opening 3a of the seat portion 3, and a tip portion formed in a conical shape can be fitted into the opening 3a.
- the valve drive device 6 brings the needle valve 5 close to the seat portion 3 so that the outer peripheral surface of the tip portion of the needle valve 5 can be in close contact with the inner edge portion of the opening 3a.
- the needle valve 5 is separated from the seat portion 3 so that a gap is formed between the outer peripheral surface of the distal end portion of the needle valve 5 and the inner edge portion of the opening 3a.
- the opening 3 a of the seat portion 3 penetrates the seat portion 3 in the vertical direction, and a recessed portion 7 is formed in the upper center of the gas passage member 4. Further, the distal end portion of the needle valve 5 formed in a conical shape faces downward, and a male screw 5a is formed at the proximal end portion of the needle valve 5 facing upward.
- the gas supply passage 1 extends horizontally from the end face on one side (right side in FIG. 3) of the gas passage member 4 toward the other side (left side in FIG. 3).
- the other end (the left side in FIG. 3) of the gas supply passage 1 communicates with the recessed portion 7 via a first intermediate passage 8 that extends obliquely upward from the end.
- the gas injection passage 2 extends horizontally from the end face on the other side (left side in FIG. 3) of the gas passage member 4 toward one side (right side in FIG. 3).
- An end portion on one side (right side in FIG. 3) of the gas injection passage 2 communicates with the recessed portion 7 via a second intermediate passage 9 that extends vertically upward from the end portion.
- the inner diameter of the upper portion of the second intermediate passage 9 is formed larger than that of the lower portion, and the seat portion 3 is fitted into the upper portion of the second intermediate passage 9.
- a fuel gas generator is connected to the end portion on one side (right side in FIG. 3) of the gas supply passage 1, and the end portion on the other side (left side in FIG. 3) of the gas injection passage 2 is 2 It communicates with the cylinder liner of the stroke gas engine.
- the valve drive device 6 includes a device main body 12, a piston 13, a spring receiver 14, a nut 15, a cover 16, and a spring 17.
- a needle valve guide hole 10 into which the needle valve 5 is inserted so that the needle valve 5 can be moved up and down is formed in the lower part of the apparatus body 12, and a piston having a larger inner diameter than the needle valve guide hole 10 is formed in the upper part of the apparatus body 12.
- a guide hole 11 is formed coaxially with the needle valve guide hole 10.
- the piston 13 is a bottomed cylindrical member composed of a pressure receiving end 13a constituting the bottom part and a skirt part 13b constituting the side surface.
- the piston guide is such that the pressure receiving end 13a faces downward and the skirt part 13b faces upward.
- the cover 16 is screwed into the upper end portion of the apparatus main body 12 to close the upper end opening of the piston guide hole 11.
- the spring 17 is accommodated in the apparatus main body 12 so as to be positioned between the cover 16 and the spring receiver 14, and urges the spring receiver 14, the piston 13, and the needle valve 5 downward.
- a fluid pressure chamber 18 is formed by the pressure receiving end 13 a of the piston 13, the inner bottom surface 11 a of the piston guide hole 11 facing the pressure receiving end 13 a, and the inner peripheral surface of the piston guide hole 11.
- a groove 13 c extending in the vertical direction is formed on the outer peripheral surface of the skirt portion 13 b of the piston 13 so as to face the inner peripheral surface of the piston guide hole 11 and reach the upper end of the piston 13. Further, the upper end portion of the spring 17 is fitted to a protrusion 16 a provided on the lower surface of the cover 16 from the outside.
- a protrusion 19 that protrudes downward from the needle valve guide hole 10 is formed at the lower portion of the device main body 12 of the valve drive device 6.
- the protruding portion 19 is fitted into the upper edge of the inner peripheral surface of the recessed portion 7 of the gas passage member 4 from above, and the gas passage member 4 is fixed to the apparatus main body 12 with a bolt 20.
- the apparatus main body 12 has a leak gas recovery hole 21 that horizontally penetrates the apparatus main body 12 from the outside toward the needle valve guide hole 10 and a horizontal penetrating through the apparatus main body 12 toward the hydraulic pressure chamber 18 from the outside.
- a hydraulic fluid pressure imparting hole 22 and an air opening hole 23 that penetrates the apparatus main body 12 horizontally from the outside toward the groove 13c on the outer peripheral surface of the piston 13 are formed.
- the air release hole 23 communicates with a space 29 surrounded by the inner peripheral surface of the skirt portion 13b, the inner peripheral surface of the piston guide hole 11, the lower surface of the cover 16, and the like through the groove 13c on the outer peripheral surface of the skirt portion 13b. ing.
- a pump 25, an electromagnetic valve 26, and a relief valve 27 are connected to the hydraulic fluid pressure imparting hole 22.
- the pump 25 discharges hydraulic oil sucked from the tank 24.
- the solenoid valve 26 causes the hydraulic oil discharge port of the pump 25 to communicate with the hydraulic chamber 18 via the hydraulic fluid pressure imparting hole 22, and when the solenoid is not excited, the hydraulic chamber 18 is activated.
- the tank 24 is communicated with the hydraulic pressure application hole 22.
- the relief valve 27 is provided to return the hydraulic oil discharged from the pump 25 to the tank 24 when the solenoid of the electromagnetic valve 26 is not excited.
- an atmosphere release pipe 28 is connected to the atmosphere release hole 23.
- 30 is an O-ring interposed between the outer peripheral surface of the projection 19 of the apparatus main body 12 and the inner peripheral surface of the recessed portion 7 of the gas passage member 4, and 31 is a needle valve of the apparatus main body 12.
- An O-ring 32 interposed between the inner peripheral surface of the guide hole 10 and the outer peripheral surface of the needle valve 5 is an O-ring interposed between the upper end surface of the apparatus main body 12 and the peripheral edge portion of the lower end surface of the cover 16. It is a ring.
- the spring receiver 14, the piston 13, and the needle valve 5 are pushed down by the elastic force of the spring 17, and the tip portion (lower end portion in FIG. 3) of the needle valve 5 formed in a conical shape is fitted into the opening 3 a of the seat portion 3.
- the outer peripheral surface of the tip portion of the needle valve 5 is in close contact with the inner edge portion of the opening 3a.
- the gas injection valve is in a closed state where the gas supply passage 1 and the gas injection passage 2 do not communicate with each other.
- the fuel gas is not fed from the fuel gas generator into the cylinder liner of the two-stroke gas engine.
- the solenoid of the electromagnetic valve 26 When the solenoid of the electromagnetic valve 26 is excited, the hydraulic oil discharged from the pump 25 is supplied to the hydraulic pressure chamber 18 through the electromagnetic valve 26 and the hydraulic pressure applying hole 22.
- the needle valve 5, the piston 13, and the spring receiver 14 are pushed up by the pressure of the hydraulic oil fed to the hydraulic pressure chamber 18, and the outer peripheral surface of the tip portion of the needle valve 5 starts from the inner edge portion of the opening 3 a of the seat portion 3.
- the gas injection valve is in an open state where the gas supply passage 1 and the gas injection passage 2 communicate with each other.
- the fuel gas is supplied from the fuel gas generator to the inside of the cylinder liner of the two-stroke gas engine at a constant injection pressure. Further, as the needle valve 5, the piston 13, and the spring receiver 14 are raised, the spring 17 is contracted.
- the hydraulic oil discharged from the pump 25 is not supplied to the hydraulic chamber 18 but passes through the relief valve 27 to the tank 24. Return.
- the hydraulic chamber 18 communicates with the tank 24 via the hydraulic fluid pressure imparting hole 22 and the electromagnetic valve 26.
- the spring receiver 14, the piston 13, and the needle valve 5 are pushed down by the elastic force of the spring 17, and the tip portion (lower end portion in FIG. 3) of the needle valve 5 formed in a conical shape is fitted into the opening 3 a of the seat portion 3.
- the outer peripheral surface of the tip portion of the needle valve 5 is in close contact with the inner edge portion of the opening 3a, and the gas injection valve is in a closed state in which the gas supply passage 1 and the gas injection passage 2 do not communicate with each other.
- the fuel gas is not supplied from the fuel gas generator to the inside of the cylinder liner of the two-stroke gas engine.
- the fuel gas is supplied from the fuel gas generator to the inside of the cylinder liner of the two-stroke gas engine at a constant injection pressure. If so, mixing of air and fuel gas is not promoted inside the cylinder liner, and the engine operation may not be maintained in an efficient and stable state.
- the solenoid of the solenoid valve 26 is repeatedly excited and de-energized, and fuel gas injection by the gas injection valve is executed intermittently.
- the surface and the inner edge portion of the opening 3a of the seat portion 3 are worn out in a short period of time.
- the present invention has been made in view of the above-described circumstances, and an object thereof is to provide a gas injection valve capable of changing the injection pressure of fuel gas while the needle valve is in an open state.
- a gas injection valve has a gas supply passage through which fuel gas is supplied and a gas injection passage through which the fuel gas can be sent into a cylinder of a gas engine. And a gas passage member having an opening that can communicate with both passages between the passages, A valve body for opening and closing the opening; When the fuel injection is stopped, the valve body is brought close to the gas passage member so that the front end portion of the valve body closes the opening, and at the time of fuel injection, the front end portion of the valve body opens the opening.
- a valve driving device for separating the valve body from the gas passage member The valve drive is An apparatus main body that movably supports the valve body in a direction to approach or separate from the gas passage member; A spring receiver attached to the valve body; A piston that is accommodated in the apparatus main body so as to be movable in the same direction as the valve body, and fluid pressure is applied in a direction away from the gas passage member; A first spring that urges the spring receiver in a direction to approach the gas passage member; A second spring that is interposed between the piston and the spring receiver and can be expanded and contracted in the moving direction of the valve body is provided.
- the valve body has a cylindrical shape
- the piston is formed in an annular shape coaxial with the valve body
- the spring receiver is disposed in the piston.
- the valve body is slidably inserted in the axial direction, and the base end portion of the valve body is attached to the spring receiver.
- the valve body has a cylindrical shape
- the piston is fitted to the valve body from the outside so as to be slidable in the axial direction of the valve body, and the spring receiver The base end portion of the valve body is attached to
- the fuel gas injection pressure can be varied while the needle valve remains open, and the needle valve seat portion does not contact during fuel injection, so that these components can be used for a long period of time.
- FIG. 1 shows an example of a gas injection valve of the present invention.
- the gas injection valve includes a gas passage member 35, a needle valve (valve element) 5 having the same configuration as that shown in FIG. 3, and a valve drive device 36.
- the gas passage member 35 sends the fuel gas G into the gas supply passage 33 through which the fuel gas G is supplied from a fuel gas generator (not shown) and the cylinder liner (not shown) of the two-stroke gas engine.
- the sheet portion 3 having a circular opening 3a having a gas injection passage 34 for communicating with the passages 33, 34 is formed between the passages 33, 34.
- a recessed portion 37 is formed in the upper center of the gas passage member 35.
- the valve drive device 36 brings the needle valve 5 close to the seat portion 3 so that the outer peripheral surface of the tip portion of the needle valve 5 can be in close contact with the inner edge portion of the opening 3a of the seat portion 3 when fuel injection is stopped.
- the needle valve 5 is separated from the seat portion 3 so that a gap is formed between the outer peripheral surface of the tip portion of the needle valve 5 and the inner edge portion of the opening 3a of the seat portion 3.
- the gas supply passage 33 extends horizontally from the end surface on one side (right side in FIG. 1) of the gas passage member 35 toward the other side (left side in FIG. 1).
- the other end (the left side in FIG. 1) of the gas supply passage 33 communicates with the recessed portion 37.
- the gas injection passage 34 extends horizontally from the end surface on the other side (left side in FIG. 1) of the gas passage member 35 toward one side (right side in FIG. 1).
- An end portion on one side (right side in FIG. 1) of the gas injection passage 34 communicates with the recessed portion 37 via an intermediate passage 38 that extends vertically upward from the end portion.
- the inner diameter of the upper portion of the intermediate passage 38 is formed larger than that of the lower portion, and the seat portion 3 is fitted into the upper portion of the intermediate passage 38.
- a fuel gas generator is connected to an end portion on one side (right side in FIG. 1) of the gas supply passage 33, and an end portion on the other side (left side in FIG. 1) of the gas injection passage 34 is 2 It communicates with the cylinder liner of the stroke gas engine.
- the valve drive device 36 includes a device main body 42, an annular piston 43, a spring receiver 45, a nut 46, a cover 48, a first spring 49, and a second spring 50.
- a needle valve guide hole 39 into which the needle valve 5 is inserted so that the needle valve 5 can be moved up and down is formed in the lower portion of the apparatus main body 42, and the inner diameter of the apparatus main body 42 is smaller than that of the needle valve guide hole 39.
- a large spring receiving guide hole 40 is formed coaxially with the needle valve guiding hole 39, and a piston guide hole 41 having a larger inner diameter than the spring receiving guide hole 40 is formed on the upper portion of the apparatus main body 42 with the needle valve guiding hole 39. It is formed coaxially.
- the annular piston 43 is inserted into the piston guide hole 41 so as to be able to move up and down, and at the lower end of the annular piston 43 is connected to the annular piston 43 and projects downward coaxially with the annular piston 43 and inserted into the spring receiving guide hole 40 so as to be able to move up and down.
- a piston extension 44 is formed.
- the spring receiver 45 is a bottomed cylindrical member that is inserted into the piston extension 44 so as to be able to move up and down, and is fitted to the external thread 5a of the needle valve 5 on the bottom surface located at the lower end thereof. Yes.
- the nut 46 is screwed into the male screw 5 a of the needle valve 5 to fix the spring receiver 45 to the needle valve 5.
- the cover 48 is fastened to the upper end portion of the apparatus main body 42 by a bolt 47 to close the open end of the piston guide hole 41.
- the first spring 49 is accommodated in the apparatus main body 42 so as to be positioned between the cover 48 and the spring receiver 45, and biases the spring receiver 45 and the needle valve 5 downward.
- the second spring 50 is accommodated in the apparatus main body 42 so as to be positioned between the spring receiver 45 and the piston extension 44, and can be expanded and contracted in the axial direction of the needle valve 5.
- a hydraulic chamber 51 is formed by the lower surface of the annular piston 43, the inner bottom surface of the piston guide hole 41 facing the lower surface of the annular piston 43, and the inner peripheral surface of the piston guide hole 41.
- the upper end portion of the first spring 49 is fitted to a protrusion 48 a provided on the lower surface of the cover 48 from the outside, and the lower end portion of the second spring 50 is formed on the inner peripheral surface of the lower end portion of the piston extension portion 44. It engages with the annular protrusion 44a.
- a protrusion 52 that protrudes downward from the needle valve guide hole 39 is formed at the lower portion of the device main body 42 of the valve drive device 36.
- the protrusion 52 is fitted from above into the upper edge of the inner peripheral surface of the recessed portion 37 of the gas passage member 35, and the gas passage member 35 is fixed to the apparatus main body 42 with a bolt 53.
- the apparatus main body 42 is provided with a leak gas recovery hole 54 that horizontally penetrates the apparatus main body 42 from the outside toward the needle valve guide hole 39 and an apparatus main body 42 from the outside toward the inner bottom portion of the spring receiving guide hole 40.
- a leaking hydraulic fluid recovery pipe 55 that penetrates horizontally
- a hydraulic fluid pressure imparting hole 56 that penetrates the apparatus main body 42 horizontally toward the hydraulic pressure chamber 51 from the outside
- an air opening hole that opens from the outside that penetrates the apparatus main body 42 horizontally.
- 57 is drilled.
- the air release hole 57 communicates from the outside with a space 58 surrounded by the upper portion of the annular piston 43, the spring receiver 45, the inner peripheral surface of the piston guide hole 41, the lower surface of the cover 48, and the like.
- the valve drive device 36 is accompanied by a tank 24, a pump 25, an electromagnetic valve 26, a relief valve 27, and an air release pipe 28.
- the solenoid of the electromagnetic valve 26 when the solenoid of the electromagnetic valve 26 is excited, the hydraulic oil discharge port of the pump 25 communicates with the hydraulic pressure chamber 51 through the hydraulic pressure application hole 56 and the solenoid of the electromagnetic valve 26 is not excited.
- the hydraulic chamber 51 is configured to communicate with the tank 24 via the hydraulic fluid pressure imparting hole 56.
- 59 is an O-ring interposed between the outer peripheral surface of the projection 52 of the apparatus main body 42 and the inner peripheral surface of the recessed portion 37 of the gas passage member 35
- 60 is a needle valve of the apparatus main body 42.
- An O-ring 61 interposed between the inner peripheral surface of the guide hole 39 and the outer peripheral surface of the needle valve 5 is interposed between the inner peripheral surface of the spring receiving guide hole 40 of the apparatus main body 42 and the piston extension 44.
- the mounted O-ring 62 is an O-ring interposed between the inner peripheral surface of the piston guide hole 41 of the apparatus main body 42 and the outer peripheral surface of the annular piston 43.
- the spring receiver 45 and the needle valve 5 are pushed down by the elastic force of the first spring 49, and the tip end portion (lower end portion in FIG. 1) of the needle valve 5 formed in a conical shape is fitted into the opening 3 a of the seat portion 3.
- the outer peripheral surface of the distal end portion of the needle valve 5 is in close contact with the inner edge portion of the opening 3a.
- the gas injection valve is in a closed state where the gas supply passage 33 and the gas injection passage 34 do not communicate with each other.
- the fuel gas is not fed from the fuel gas generator into the cylinder liner of the two-stroke gas engine.
- the spring receiver 45 compresses the second spring 50, and the piston extension 44 and the annular biston 43 are urged downward by the elastic force of the second spring 50.
- the fuel gas is fed from the fuel gas generator into the cylinder liner of the two-stroke gas engine.
- the spring receiver 45 When the spring receiver 45 is raised, a force in the compression direction acts on the first spring 49, and the spring receiver 45 and the needle valve 5 are supported by the first spring 49 and the second spring 50. . Then, the spring receiver 45 and the needle valve 5 cause a simple vibration under the influence of the mass and the spring load of the first and second springs 49 and 50, and the needle valve 5 reciprocates up and down. Thereby, the flow path area between the outer peripheral surface of the tip portion of the needle valve 5 and the opening 3 a of the seat portion 3 increases or decreases according to the elevation of the needle valve 5.
- the hydraulic oil discharged from the pump 25 is not supplied to the hydraulic chamber 51 but passes through the relief valve 27 to the tank 24.
- the hydraulic chamber 51 communicates with the tank 24 through the hydraulic fluid pressure imparting hole 56 and the electromagnetic valve 26.
- the spring receiver 45 is pushed down by the elastic force of the first spring 49, and the tip portion (lower end portion in FIG. 1) of the needle valve 5 formed in a conical shape fits into the opening 3 a of the seat portion 3.
- the outer peripheral surface of the tip end portion is in close contact with the inner edge portion of the opening 3a, and the gas injection valve is in a closed state where the gas supply passage 1 and the gas injection passage 2 do not communicate with each other.
- the fuel gas G is not fed from the fuel gas generator into the cylinder liner of the two-stroke gas engine.
- the needle valve 5 since the needle valve 5 is vibrated only by turning on and off the excitation current for the electromagnetic valve 26, the injection control of the fuel gas G can be performed with a simple configuration. Moreover, since the needle valve 5 and the seat part 3 do not contact during fuel injection, these parts can be used over a long period of time.
- the flow passage area between the outer peripheral surface of the tip portion of the needle valve 5 and the opening 3a of the seat portion 3 increases or decreases according to the raising and lowering of the needle valve 5, and accordingly, from the fuel gas generator via the gas injection passage 34. Since the injection pressure of the fuel gas G fed into the cylinder liner of the two-stroke gas engine fluctuates, mixing of the air and the fuel gas G is promoted inside the cylinder liner in an efficient and stable state. Maintain engine operation.
- FIG. 2 shows another example of the gas injection valve of the present invention.
- This gas injection valve includes a gas passage member 4 incorporating a seat portion 3, a needle valve (valve element) 5, and an outer peripheral surface of a tip portion of the needle valve 5 at the inner edge of the opening 3 a of the seat portion 3 when fuel injection is stopped.
- the needle valve 5 is brought close to the seat portion 3 so as to be in close contact with the portion, and a gap is formed between the outer peripheral surface of the tip portion of the needle valve 5 and the inner edge portion of the opening 3a of the seat portion at the time of fuel injection.
- a valve drive device 62 that separates the needle valve 5 from the seat portion 3 is provided.
- the gas passage member 4 and the needle valve 5 have the same configuration as the gas injection valve shown in FIG. 3, and a fuel gas generator (not shown) is provided at one end (right side in FIG. 2) of the gas supply passage 1.
- the other end (left side in FIG. 2) of the gas injection passage 2 communicates with the inside of a cylinder liner (not shown) of the two-stroke gas engine.
- the valve drive device 62 includes a device main body 66, an annular piston 67, a stopper 68, a spring receiver 69, a nut 70, a first spring 73, and a second spring 74.
- a needle valve guide hole 63 into which the needle valve 5 is inserted so that the needle valve 5 can be moved up and down is formed in the lower part of the apparatus main body 66, and a piston guide hole having a larger inner diameter than the needle valve guide hole 63 in the middle part in the vertical direction. 64 is formed coaxially with the needle valve guide hole 63. Further, a stopper support hole 65 having a larger inner diameter than the piston guide hole 64 is formed in the upper portion of the apparatus main body 66.
- the annular piston 67 is inserted into the piston guide hole 64 so as to be movable up and down, and is fitted to the needle valve 5 from the outside so as to be movable up and down.
- the stopper 68 is a cylindrical member fitted into the stopper support hole 65, and a spring receiver 69 is inserted into the stopper 68 so as to be movable up and down.
- the spring receiver 69 has a bottomed cylindrical shape, and is fitted to the external thread 5a of the needle valve 5 from the outside on the bottom surface located at the lower end thereof.
- the nut 70 is screwed into the male screw 5 a of the needle valve 5 to fix the spring receiver 69 to the needle valve 5.
- the cover 72 is fastened to the upper end portion of the apparatus main body 66 by a bolt 71 to close the opening end of the stopper support hole 65.
- the first spring 73 is accommodated in the apparatus main body 66 so as to be positioned between the cover 72 and the spring receiver 69 and urges the spring receiver 69 and the needle valve 5 downward.
- the second spring 74 is accommodated in the apparatus main body 66 so as to be positioned between the spring receiver 69 and the annular piston 67 and can be expanded and contracted in the axial direction of the needle valve 5.
- a hydraulic chamber 75 is formed by the lower surface of the annular piston 67, the inner bottom surface of the piston guide hole 64 facing the lower surface of the annular piston 67, and the inner peripheral surface of the piston guide hole 64.
- the upper end portion of the first spring 73 is fitted into a protrusion 72 a provided on the lower surface of the cover 72 from the outside, and the lower end portion of the second spring 50 is fitted into an annular groove 67 a formed on the upper surface of the annular piston 67.
- An annular protrusion 68 a for restricting the upward movement of the annular piston 67 is formed on the inner peripheral surface of the lower end portion of the stopper 68.
- a groove 69 a extending in the vertical direction is formed on the outer peripheral surface of the spring receiver 69.
- a protrusion 76 that protrudes downward from the needle valve guide hole 63 is formed at the lower portion of the device main body 66 of the valve drive device 62.
- the protrusion 76 is fitted from above into the upper edge of the inner peripheral surface of the recessed portion 7 of the gas passage member 4, and the gas passage member 4 is fastened to the apparatus main body 66 by a bolt 77.
- the apparatus main body 66 has a leak gas recovery hole 78 that horizontally penetrates the apparatus main body 66 from the outside toward the needle valve guide hole 63, and horizontally penetrates the apparatus main body 66 toward the hydraulic pressure chamber 75 from the outside.
- a hydraulic fluid pressure imparting hole 79 and an air opening hole 80 are bored from the outside horizontally penetrating the apparatus main body 66.
- the air opening hole 80 communicates from the outside with a space 81 surrounded by the annular piston 67, the inner peripheral surface of the piston guide hole 64, the spring receiver 69, the inner peripheral surface of the stopper 68, and the like.
- a space 86 surrounded by the stopper 68, the spring receiver 69, the cover 72, and the like communicates with the space 81 via a groove 69a on the outer peripheral surface of the spring receiver 69.
- the valve drive device 62 is accompanied by a tank 24, a pump 25, an electromagnetic valve 26, a relief valve 27, and an air release pipe 28.
- the solenoid of the electromagnetic valve 26 when the solenoid of the electromagnetic valve 26 is excited, the hydraulic oil discharge port of the pump 25 communicates with the hydraulic pressure chamber 75 via the hydraulic pressure applying hole 79 and the solenoid of the electromagnetic valve 26 is not excited.
- the hydraulic chamber 75 is configured to communicate with the tank 24 via the hydraulic fluid pressure imparting hole 79.
- 82 is an O-ring interposed between the outer peripheral surface of the protrusion 76 of the apparatus main body 66 and the inner peripheral surface of the recessed portion 7 of the gas passage member 4, and 83 is a needle valve of the apparatus main body 66.
- An O-ring interposed between the inner peripheral surface of the guide hole 63 and the outer peripheral surface of the needle valve 5, and the flange 84 are O-rings interposed between the inner peripheral surface of the annular piston 67 and the outer peripheral surface of the needle valve 5.
- 85 are O-rings interposed between the upper end surface of the apparatus main body 66 and the peripheral edge portion of the lower end surface of the cover 72.
- the spring receiver 69 and the needle valve 5 are pushed down by the elastic force of the first spring 73, and the tip end portion (lower end portion in FIG. 2) of the needle valve 5 formed in a conical shape is fitted into the opening 3 a of the seat portion 3.
- the outer peripheral surface of the distal end portion of the needle valve 5 is in close contact with the inner edge portion of the opening 3a.
- the gas injection valve is in a closed state where the gas supply passage 1 and the gas injection passage 2 do not communicate with each other.
- the fuel gas G is not fed from the fuel gas generator into the cylinder liner of the two-stroke gas engine. Further, the spring receiver 69 compresses the second spring 74, and the annular piston 67 is biased downward by the elastic force of the second spring 74.
- the fuel gas G is fed from the fuel gas generator into the cylinder liner of the two-stroke gas engine.
- the annular piston 67 rises, the force in the compression direction of the first spring 73 works, and the spring receiver 69 and the needle valve 5 are supported by the first spring 73 and the second spring 74. . Then, the spring receiver 69 and the needle valve 5 cause a simple vibration under the influence of the mass and the spring load of the first and second springs 73 and 74, and the needle valve 5 reciprocates up and down. Thereby, the flow path area between the distal end portion outer peripheral surface of the needle valve 5 and the opening 3 a of the seat portion 3 increases or decreases as the needle valve 5 moves up and down.
- the hydraulic oil discharged from the pump 25 is not supplied to the hydraulic chamber 51 but passes through the relief valve 27 to the tank 24.
- the hydraulic chamber 75 communicates with the tank 24 via the hydraulic fluid pressure imparting hole 79 and the electromagnetic valve 26.
- the spring receiver 69 is pushed down by the elastic force of the first spring 73, and the tip portion (lower end portion in FIG. 2) of the needle valve 5 formed in a conical shape fits into the opening 3 a of the seat portion 3.
- the outer peripheral surface of the tip end portion is in close contact with the inner edge portion of the opening 3a, and the gas injection valve is in a closed state where the gas supply passage 1 and the gas injection passage 2 do not communicate with each other.
- the fuel gas G is not fed from the fuel gas generator into the cylinder liner of the two-stroke gas engine.
- the needle valve 5 since the needle valve 5 is operated only by turning on and off the excitation current for the electromagnetic valve 26, the injection control of the fuel gas G can be performed with a simple configuration. Moreover, since the needle valve 5 and the seat part 3 do not contact during fuel injection, these parts can be used over a long period of time.
- the flow passage area between the outer peripheral surface of the tip end portion of the needle valve 5 and the opening 3a of the seat portion 3 increases or decreases as the needle valve 5 moves up and down, and passes through the gas injection passage 2 to the two-stroke gas from the fuel gas generator. Since the injection pressure of the fuel gas G fed into the cylinder liner of the engine fluctuates, mixing of the air and the fuel gas G is promoted inside the cylinder liner, and the engine is operated in an efficient and stable state. Can be maintained.
- gas injection valve of the present invention is not limited to the above-described embodiment, and it is needless to say that changes can be made without departing from the gist of the present invention.
- the injection pressure of fuel gas can be changed while the needle valve remains open.
- Gas supply passage 2. Gas injection passage, 3. Seat part, 3a opening, 4. Gas passage member, 5. Needle valve (valve element), 33. Gas supply passage, 34. Gas injection passage, 35. Gas passage member, 36.
- Valve drive device 42 device body, 43 annular piston, 45 spring receiver, 49 first spring, 50 second spring, 62 valve drive device, 66 device body, 67 annular piston, 69 spring receiver, 69a groove, 73 first spring, 74 Second spring, G fuel gas
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Abstract
Description
本願は、2010年9月28日に日本に出願された特願2010-217133号に基づき優先権を主張し、その内容をここに援用する。
このガス噴射弁は、ガス通路部材4と、針弁5と、弁駆動装置6とを備えている。
ガス通路部材4は、燃料ガス発生装置(図示せず)から燃料ガスGが送給されるガス供給通路1、及び2ストロークガス機関のシリンダライナ(図示せず)の内部に燃料ガスGを送出するためのガス噴射通路2を有し、これら通路1,2の間に、両通路1,2に連通し得る円形の開口3aを形成したシート部3が組み込まれている。
針弁5は、シート部3の開口3aの上方に、開口3aと同軸に配置され、円錐状に形成した先端部分が開口3aに嵌入可能となっている。
弁駆動装置6は、燃料噴射停止時に、針弁5の先端部分の外周面が開口3aの内縁部分に密着し得るように、針弁5をシート部3に向けて近接させ、燃料噴射時に、針弁5の先端部分の外周面と開口3aの内縁部分との間に空隙が形成されるように、針弁5をシート部3に対して離隔させる。
装置本体12の下側部分には、針弁5が昇降可能に挿入される針弁案内孔10が形成され、装置本体12の上側部分には、針弁案内孔10に比べて内径が大きなピストン案内孔11が、針弁案内孔10と同軸に形成されている。
ピストン13は、底部を構成する受圧端13aと、側面を構成するスカート部13bとからなる有底円筒状の部材で、受圧端13aが下方を向き、スカート部13bが上方を向くようにピストン案内孔11に昇降可能に挿入されている。また、受圧端13aには、針弁5の基端部分のおねじ5aが下方から貫通されている。
ばね受け14は、上方からピストン13のスカート部13bの内部に挿入され、針弁5のおねじ5aに外側から嵌合している。
ナット15は、針弁5のおねじ5aに螺合してばね受け14及びピストン13を針弁5に固定している。
カバー16は、装置本体12の上端部に螺合されてピストン案内孔11の上端開口を閉止している。
ばね17は、カバー16とばね受け14との間に位置するように装置本体12に収容され、ばね受け14、ピストン13、及び針弁5を下方へ向けて付勢している。
そして、ピストン13の受圧端13a、受圧端13aに向き合うピストン案内孔11の内底面11a、及びピストン案内孔11の内周面によって、液圧室18を形成している。
大気開放孔23は、スカート部13bの外周面の溝13cを介して、スカート部13bの内周面、ピストン案内孔11の内周面、及びカバー16の下面などで囲まれる空間29に連通している。
電磁弁26のソレノイドを励磁していないと、ポンプ25が吐出する作動油は、液圧室18へは送給されずにリリーフ弁27を経てタンク24に戻る。このとき、液圧室18は、作動液圧付与孔22、及び電磁弁26を介してタンク24に連通している。
前記開口を開閉させる弁体と、
燃料噴射停止時に、前記弁体の先端部分が前記開口を閉じるように、前記弁体を前記ガス通路部材に対して近接させ、燃料噴射時に、前記弁体の先端部分が前記開口を開くように、前記弁体を前記ガス通路部材に対して離隔させる弁駆動装置とを備え、
弁駆動装置は、
前記弁体を前記ガス通路部材に対し近接または離隔させる方向に移動可能に支持する装置本体と、
前記弁体に取り付けたばね受けと、
前記装置本体に前記弁体と同方向に移動し得るように収容され、前記ガス通路部材から離隔する方向へ流体圧が付与されるピストンと、
前記ばね受けを前記ガス通路部材に対し近接させる方向に付勢する第一のばねと、
前記ピストンと前記ばね受けとの間に介在し、前記弁体の移動方向に伸縮可能な第二のばねと
を有している。
図1は本発明のガス噴射弁の一例を示すもので、図中、図3と同様の構成を有する部分については、図3と同一の符号を付し、その説明を省略する。
このガス噴射弁は、ガス通路部材35と、図3と同様の構成を有する針弁(弁体)5と、弁駆動装置36とを備えている。
ガス通路部材35は、燃料ガス発生装置(図示せず)から燃料ガスGが送給されるガス供給通路33、及び2ストロークガス機関のシリンダライナ(図示せず)の内部に燃料ガスGを送出するためのガス噴射通路34を有し、これら通路33,34の間に両通路33,34に連通し得る円形の開口3aを形成したシート部3が組み込まれている。また、ガス通路部材35の上部中央には、凹陥部37が形成されている。
弁駆動装置36は、燃料噴射停止時に、針弁5の先端部分外周面がシート部3の開口3aの内縁部分に密着し得るように、針弁5をシート部3に向けて近接させ、燃料噴射時に、針弁5の先端部分の外周面とシート部3の開口3aの内縁部分との間に空隙が形成されるように、針弁5をシート部3に対して離隔させる。
装置本体42の下側部分には、針弁5が昇降可能に挿入される針弁案内孔39が形成され、装置本体42の上下方向中間部分には、針弁案内孔39に比べて内径が大きなばね受け案内孔40が針弁案内孔39と同軸に形成され、装置本体42の上側部分には、ばね受け案内孔40に比べて内径が大きなピストン案内孔41が、針弁案内孔39と同軸に形成されている。
環状ピストン43は、ピストン案内孔41に昇降可能に挿入され、その下端には、環状ピストン43に連なって下方へ環状ピストン43と同軸に突出し、ばね受け案内孔40に昇降可能に挿入された筒状のピストン延長部44が形成されている。
ばね受け45は、ピストン延長部44の内部に上方から昇降可能に挿入された有底円筒状の部材で、その下端に位置する底面において、針弁5のおねじ5aに外側から嵌合している。
ナット46は、針弁5のおねじ5aに螺合してばね受け45を針弁5に固定している。
カバー48は、装置本体42の上端部にボルト47により締結されてピストン案内孔41の開口端を閉止している。
第一のばね49は、カバー48とばね受け45との間に位置するように装置本体42に収容され、ばね受け45、及び針弁5を下方へ向けて付勢している。
第二のばね50は、ばね受け45とピストン延長部44との間に位置するように装置本体42に収容され、針弁5の軸線方向に伸縮可能となっている。
そして、環状ピストン43の下面、環状ピストン43の下面に向き合うピストン案内孔41の内底面、及びピストン案内孔41の内周面によって、液圧室51を形成している。
大気開放孔57は、環状ピストン43の上部、ばね受け45、ピストン案内孔41の内周面、及びカバー48の下面などで囲まれる空間58に外部から連通している。
電磁弁26のソレノイドを励磁していないと、ポンプ25が吐出する作動油は、液圧室51へは送給されずにリリーフ弁27を経てタンク24に戻る。このとき、液圧室51は、作動液圧付与孔56、及び電磁弁26を介してタンク24に連通している。
このガス噴射弁は、シート部3を組み込んだガス通路部材4と、針弁(弁体)5と、燃料噴射停止時に、針弁5の先端部分の外周面がシート部3の開口3aの内縁部分に密着し得るように、針弁5をシート部3に向けて近接させ、燃料噴射時に、針弁5の先端部分外周面とシート部の開口3a内縁部分との間に空隙が形成されるように、針弁5をシート部3に対して離隔させる弁駆動装置62とを備えている。
装置本体66の下側部分には、針弁5が昇降可能に挿入される針弁案内孔63が形成され、上下方向中間部分には、針弁案内孔63に比べて内径が大きなピストン案内孔64が針弁案内孔63と同軸に形成されている。また、装置本体66の上側部分には、ピストン案内孔64に比べて内径が大きなストッパ支持孔65が形成されている。
環状ピストン67は、ピストン案内孔64に昇降可能に挿入され、針弁5に昇降可能に外側から嵌合している。
ストッパ68は、ストッパ支持孔65に嵌入した筒状の部材で、ストッパ68の内部には、ばね受け69が上方から昇降可能に挿入されている。
ばね受け69は、有底円筒状をなし、その下端に位置する底面において、針弁5のおねじ5aに外側から嵌合している。
ナット70は、針弁5のおねじ5aに螺合してばね受け69を針弁5に固定している。
カバー72は、装置本体66の上端部にボルト71により締結されてストッパ支持孔65の開口端を閉止している。
第一のばね73は、カバー72とばね受け69との間に位置するように装置本体66に収容され、ばね受け69、及び針弁5を下方へ向けて付勢している。
第二のばね74は、ばね受け69と環状ピストン67との間に位置するように装置本体66に収容され、針弁5の軸線方向に伸縮可能となっている。
そして、環状ピストン67の下面、環状ピストン67の下面に向き合うピストン案内孔64の内底面、及びピストン案内孔64の内周面によって、液圧室75を形成している。
大気開放孔80は、環状ピストン67、ピストン案内孔64の内周面、ばね受け69、及びストッパ68の内周面などで囲まれる空間81に外部から連通している。この空間81には、ばね受け69外周面の溝69aを介して、ストッパ68、ばね受け69、及びカバー72などで囲まれる空間86が連通している。
電磁弁26のソレノイドを励磁していないと、ポンプ25が吐出する作動油は、液圧室75へは送給されずにリリーフ弁27を経てタンク24に戻る。このとき、液圧室75は、作動液圧付与孔79、及び電磁弁26を介してタンク24に連通している。
Claims (3)
- 燃料ガスが送給されるガス供給通路、及び燃料ガスをガス機関のシリンダ内部へ送出し得るガス噴射通路を有し、これら通路の間に両通路に連通し得る開口を備えるガス通路部材と、
前記開口を開閉させる弁体と、
燃料噴射停止時に、前記弁体の先端部分が前記開口を閉じるように、前記弁体を前記ガス通路部材に対して近接させ、燃料噴射時に、前記弁体の先端部分が前記開口を開くように、前記弁体を前記ガス通路部材に対して離隔させる弁駆動装置とを備え、
弁駆動装置は、
前記弁体を前記ガス通路部材に対し近接または離隔させる方向に移動可能に支持する装置本体と、
前記弁体に取り付けたばね受けと、
前記装置本体に前記弁体と同方向に移動し得るように収容され、前記ガス通路部材から離隔する方向へ流体圧が付与されるピストンと、
前記ばね受けを前記ガス通路部材に対し近接させる方向に付勢する第一のばねと、
前記ピストンと前記ばね受けとの間に介在し、前記弁体の移動方向に伸縮可能な第二のばねと
を有するガス噴射弁。 - 前記弁体が円柱状をなし、前記ピストンを前記弁体と同軸をなす環状に形成し、前記ばね受けを前記ピストン内に前記弁体の軸線方向へ摺動可能に挿入し、前記ばね受けに前記弁体の基端部分を取り付けた請求項1に記載のガス噴射弁。
- 前記弁体が円柱状をなし、前記ピストンを前記弁体に前記弁体の軸線方向へ摺動可能に外側から嵌合させ、前記ばね受けに前記弁体の基端部分を取り付けた請求項1に記載のガス噴射弁。
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CN201180046315.4A CN103109068B (zh) | 2010-09-28 | 2011-09-28 | 气体喷射阀 |
KR1020137005115A KR101410789B1 (ko) | 2010-09-28 | 2011-09-28 | 가스 분사 밸브 |
DK11829208.5T DK2623762T3 (en) | 2010-09-28 | 2011-09-28 | GAS INJECTION VALVE |
EP11829208.5A EP2623762B1 (en) | 2010-09-28 | 2011-09-28 | Gas injection valve |
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- 2011-09-28 CN CN201180046315.4A patent/CN103109068B/zh active Active
- 2011-09-28 KR KR1020137005115A patent/KR101410789B1/ko active IP Right Grant
- 2011-09-28 WO PCT/JP2011/072239 patent/WO2012043655A1/ja active Application Filing
- 2011-09-28 DK DK11829208.5T patent/DK2623762T3/en active
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US8972151B2 (en) | 2010-08-05 | 2015-03-03 | Ihi Corporation | Two-cycle engine |
CN104100377A (zh) * | 2013-04-12 | 2014-10-15 | 曼柴油机和涡轮机欧洲股份公司 | 用于燃气发动机的燃料供给和冲洗设备 |
CN107131078A (zh) * | 2017-06-28 | 2017-09-05 | 哈尔滨工程大学 | 一种旁通式轴向进气的内导向燃气喷射阀 |
CN112696514A (zh) * | 2020-12-25 | 2021-04-23 | 上海百图低温阀门有限公司 | 车用lng绝热气瓶增压调压阀 |
Also Published As
Publication number | Publication date |
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CN103109068A (zh) | 2013-05-15 |
EP2623762A4 (en) | 2015-08-05 |
KR20130035275A (ko) | 2013-04-08 |
KR101410789B1 (ko) | 2014-06-23 |
CN103109068B (zh) | 2015-05-27 |
EP2623762B1 (en) | 2016-12-07 |
DK2623762T3 (en) | 2017-03-13 |
JP5551037B2 (ja) | 2014-07-16 |
EP2623762A1 (en) | 2013-08-07 |
JP2012072685A (ja) | 2012-04-12 |
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