JP2004036403A - Fuel gas control mechanism and internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel gas control mechanism for surely blocking up a fuel gas supply hole even if fuel gas mixed with a fine foreign matter is used, and an internal combustion engine for improving output efficiency and durability by using this fuel gas control mechanism. <P>SOLUTION: This fuel gas control mechanism 10 has a fuel gas passage 9 for supplying the fuel gas to a combustion chamber of the internal combustion engine and a fuel gas adjusting valve 13 for controlling a supply quantity of the fuel gas by opening-closing the fuel gas supply passage 9, and is characterized by comprising a hydraulic cylinder 11 for driving the fuel gas adjusting valve 13, a hydraulic fluid adjusting valve 24 for controlling the inflow and the outflow of the hydraulic fluid being driving force of the hydraulic cylinder 11 and a control part 27 for controlling operation of the hydraulic fluid adjusting valve 24. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fuel gas control mechanism used in a fuel gas supply device that supplies fuel gas to a combustion chamber in an internal combustion engine such as a gas engine, and an internal combustion engine provided with the fuel gas control mechanism.
[0002]
[Prior art]
Generally, an internal combustion engine widely used as a power generation engine or the like generally has a structure including a cylinder forming a combustion chamber, a piston reciprocating in the cylinder, and a crank transmitting reciprocating power of the piston to a load. It is a target. Among conventional internal combustion engines of this type, for example, in a gas engine, fuel gas is sucked into a cylinder in an intake stroke, and the fuel gas is compressed to a high pressure by a piston in a subsequent compression stroke. Repeating a series of operations in which ignition is controlled by injecting pilot fuel into the fuel gas that is ignited, the fuel gas is burned and expanded, and the exhaust gas after combustion is exhausted from the cylinder in the subsequent exhaust stroke And the power is obtained by rotating the crank. Further, in order to operate the gas engine, a fixed amount of compressed air is always stored.
[0003]
A fuel gas supply device for supplying a fuel gas into a combustion chamber includes a fuel gas supply hole opened at an upper portion of the combustion chamber, a fuel gas control mechanism for controlling a supply amount of the fuel gas supplied to the combustion chamber, and a fuel gas supply mechanism. The control mechanism is provided with a fuel gas supply pipe for delivering fuel gas.
[0004]
A fuel gas control mechanism 1 as shown in FIG. 4 includes a fuel gas supply path 2 to which a fuel gas supply pipe (not shown) of a fuel gas supply device is connected, and a fuel gas passing through the fuel gas supply path 2. A fuel gas supply hole 3 for supplying to a combustion chamber (not shown), a fuel gas regulating valve 4 for closing or opening the fuel gas supply hole 3 to control a fuel gas supply amount, and a fuel gas regulating valve 4 are provided. The spring 5 is configured to include a biasing spring 5 and a solenoid coil 6 that drives the fuel gas regulating valve 4 against the spring 5.
[0005]
The fuel gas supply hole 3 is closed by a fuel gas regulating valve 4 urged by a spring 5, and the fuel gas is delivered from the fuel gas supply pipe to a position immediately before the fuel gas supply hole 3. Then, the fuel gas adjusting valve 4 is driven by the solenoid coil 6 in conjunction with the movement of the piston to open the fuel gas supply hole 3, whereby the fuel gas is supplied into the combustion chamber at a stretch.
[0006]
[Problems to be solved by the invention]
By the way, in the above fuel gas control mechanism, the urging force of the fuel gas regulating valve 4 by the spring 5 is set smaller than the driving force by the solenoid coil 6, so that fine foreign matters mixed in the fuel gas cause There is a problem that the fuel gas supply valve 3 is not completely closed by the fuel gas regulating valve 4. When the fuel gas supply hole 3 is not completely closed, the fuel gas is excessively supplied into the combustion chamber, so that not only abnormal combustion occurs in the gas engine but also the durability of the gas engine may be reduced. is there. In order to solve such a problem, it is conceivable to use a solenoid coil 6 having a strong driving force. However, the solenoid coil 6 is arranged in a limited space near a combustion chamber surrounded by components of a gas engine. Therefore, there is a problem that the solenoid coil 6 cannot be increased in size and the driving force cannot be increased.
[0007]
The present invention has been made in view of the above circumstances, and even when using a fuel gas mixed with fine foreign matter, a fuel gas control mechanism that can reliably block the fuel gas supply path, and It is an object of the present invention to provide an internal combustion engine having improved output efficiency and durability using the fuel gas control mechanism.
[0008]
[Means for Solving the Problems]
As means for solving the above problems, a fuel gas control mechanism having the following configuration is employed.
That is, a fuel gas control mechanism according to a first aspect of the present invention controls a fuel gas supply path for supplying a fuel gas to a combustion chamber of an internal combustion engine and a fuel gas supply path by opening and closing the fuel gas supply path. A fuel gas control mechanism comprising a fuel gas control valve for controlling the fuel gas control valve, and a working fluid for controlling inflow and outflow of a working fluid serving as a driving force of the fluid pressure cylinder. It is characterized by comprising a regulating valve and a control unit for controlling the operation of the working fluid regulating valve.
[0009]
In the present invention, the fuel gas control mechanism is configured to open and close the fuel gas regulating valve by a hydraulic cylinder that uses the pressure of the working fluid as the driving force, so that a driving force stronger than the driving force by the solenoid coil is obtained. Can be In addition, since the working fluid regulating valve and the control unit can be disposed separately from the hydraulic cylinder, the hydraulic cylinder disposed near the combustion chamber has the same configuration and dimensions as the solenoid coil. Strong driving force can be obtained. Thereby, even if minute foreign matter is mixed in the fuel gas, the fuel gas supply path can be reliably closed.
[0010]
Further, in the fuel gas control mechanism according to claim 2, in the fuel gas control mechanism according to claim 1, the fluid pressure cylinder includes a casing having airtightness, and a driving force generated by a pressure of the working fluid. It is characterized by comprising a movable member for transmitting to the fuel gas regulating valve and a biasing means for biasing the fuel gas regulating valve in a sealing direction.
[0011]
In the present invention, the fuel gas control mechanism closes the fuel gas regulating valve, which is in close contact with the urging means that continuously applies (urges) the driving force in the sealing direction to the fuel gas regulating valve, by the pressure of the working fluid. It is configured to be driven in the direction to release. Since the driving force for releasing the close contact can be increased by using the working fluid, the urging force by the urging means can be increased. That is, the fuel gas regulating valve can more strongly close the fuel gas supply path. Thereby, even if minute foreign matter is mixed in the fuel gas, the fuel gas supply path can be reliably closed.
[0012]
Further, an internal combustion engine according to a third aspect is characterized in that, in the fuel gas control mechanism according to the first or second aspect, compressed air used for operating the internal combustion engine is used as the working fluid.
[0013]
In the present invention, since the working fluid used as the driving force of the fuel gas control mechanism is compressed air used for operating the internal combustion engine, the fuel gas control mechanism does not need to store the working fluid exclusively for driving the fuel gas control mechanism. The mechanism can be driven. Thus, the fuel gas control mechanism can be configured at low cost.
[0014]
According to a fourth aspect of the present invention, there is provided an internal combustion engine using a fuel gas supply device provided with the fuel gas control mechanism according to any one of the first to third aspects.
In the present invention, since the internal combustion engine is constituted by using the fuel gas supply device having the above fuel gas control mechanism, the driving of the fuel gas regulating valve is strongly performed using the compressed air used for operating the internal combustion engine. Is performed. As a result, the fuel gas supply path is reliably closed, and the output efficiency of the internal combustion engine and the durability can be improved.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a schematic side view of a gas engine, which is an internal combustion engine, and FIG. The gas engine 50 includes an engine body 51 having a combustion chamber (not shown), a fuel gas supply device 52 for supplying fuel gas to the engine body 51, and a liquid fuel supply device 53 for supplying liquid fuel. It is configured. The fuel gas supply device 52 includes a fuel gas supply pipe 54 for delivering fuel gas from a fuel gas supply pipe (not shown), and a fuel connected to the fuel gas supply pipe 54 for controlling the supply of combustion gas to the combustion chamber. A gas control mechanism 10 is provided. The liquid fuel supply device 53 includes a plurality of pressurizing pumps 55 for pressurizing the liquid fuel, a high-pressure oil collecting pipe 56 for collecting the pumped liquid fuel, and a common rail for delivering the liquid fuel from the high-pressure oil collecting pipe 56 to the combustion chamber. 57.
[0016]
FIG. 1 shows a fuel gas control mechanism of the gas engine 50. FIG. 1A shows a valve closed state and FIG. 1B shows a valve open state. The fuel gas control mechanism 10 includes a fuel gas supply passage 9 connected to the fuel gas supply pipe 54, a fuel gas supply hole 12 provided in the fuel gas supply passage 9 so as to open to the combustion chamber, and a fuel gas supply hole 9. A fuel gas regulating valve 13 for closing the fuel cell 12, an air cylinder 11 as a fluid pressure cylinder for driving the fuel gas regulating valve 13, and a compressed air supply unit 14 for supplying compressed air as a working fluid to the air cylinder 11 are provided. It is configured.
[0017]
The air cylinder 11 includes an airtight casing 15, a movable member 16 to which the fuel gas adjustment valve 13 is fixed, and a spring 17 as an urging means. The movable member 16 includes a piston 18 that receives the pressure of the compressed air, and a rod 19 that transmits the operation of the piston 18 to the fuel gas regulating valve 13. The sliding portion is configured to have airtightness. The casing 15 is divided into a pressurized chamber 20 into which compressed air is introduced by the piston portion 18 of the movable member 16 and a spring chamber 21 in which the spring 17 is housed. And an outflow compressed air introduction hole 22.
[0018]
The compressed air supply unit 14 includes an air tube 23 that connects a compressed air source (not shown) and a compressed air introduction hole 22 of the pressurizing chamber 20, and an electromagnetic valve (working fluid adjustment) provided in the middle of the air tube 23. (Valve) 24 and a control unit 27 for controlling the electromagnetic valve 24. A three-way valve is used as the electromagnetic valve 24 that controls the compressed air. When a current flows through the electromagnetic valve 24, the compressed air is sent to the pressurizing chamber 20, and when the current is cut off, the air in the pressurizing chamber 20 is released. The operation is performed by the control unit 27 in accordance with the timing of the intake process of the gas engine 50.
[0019]
The fuel gas regulating valve 13 has a shape in which the peripheral edge of the plate-shaped member hangs downward, and the tip end surface of the hang-down portion is a contact surface 25, and the annular member 26 which forms the fuel gas supply hole 12 is formed. The fuel gas supply hole 12 is closed by the close contact between the upper surface and the contact surface 25. In FIG. 1, a combustion chamber is provided below the fuel gas supply hole 12.
[0020]
In the closed state as shown in FIG. 1A, no current is supplied to the electromagnetic valve 24 and the compressed air supplied from the compressed air source is cut off by the electromagnetic valve 24, The piston portion 18 is pressed, the fuel gas supply hole 12 is closed by the fuel gas regulating valve 13, and the fuel gas supply passage 9 is filled with the supplied fuel gas.
[0021]
Also, in the valve open state as shown in FIG. 1B, a current is flowing through the electromagnetic valve 24, the compressed air supplied from the compressed air source flows into the pressurizing chamber 20, and the fuel gas regulating valve 13 is opened. Since the fuel gas supply hole 12 is lifted, the fuel gas supply hole 12 is opened, and the fuel gas is supplied from the fuel gas supply passage 9 through the fuel gas supply hole 12 to the combustion chamber. The arrows in the figure indicate the flow of the fuel gas.
[0022]
The operation of supplying the fuel gas to the combustion chamber using the fuel gas control mechanism 10 having the above-described configuration will be described.
In the state where the fuel gas supply hole 12 is closed by the fuel gas adjusting valve 13 as shown in FIG. As a result, compressed air flows into the pressurized chamber 20 through the compressed air introduction hole 22. The compressed air causes pressure to be applied to the piston portion 18 to move the piston portion 18 in a direction to compress the spring 17, and the fuel gas adjusting valve 13 is raised. Thereby, the close contact between the contact surface 25 of the fuel gas regulating valve 13 and the annular member 26 is released, and the fuel gas supply hole 12 is opened.
[0023]
As shown in FIG. 1B, the fuel gas is supplied to the combustion chamber through the gap between the contact surface 25 and the annular member 26. Then, when the current of the electromagnetic valve 24 is cut off in accordance with the timing of the compression step, the compressed air in the pressurizing chamber 20 flows out, the piston 17 is moved by the spring 17, and the fuel gas regulating valve 13 is pushed down, and the fuel gas is released. The gas supply holes 12 are closed.
[0024]
For example, when the compressed air of 0.7 MPa is used and the diameter of the piston portion 18 is 80 mm, the fuel gas regulating valve 13 is opened with a driving force of about 3.5 kN. Normally, the spring 17 is set to about 1/5 of the driving force used for opening the valve, so that the biasing force of the spring 17 can be set to 0.7 kN. The conventionally used solenoid coil 6 shown in FIG. 4 has a driving force of about 0.4 kN, and the biasing force of the spring 5 is 0.08 kN.
[0025]
As described above, it can be seen that by using the pressure of the compressed air as the driving force, a driving force and an urging force approximately nine times as high as those of the related art can be obtained. In the case where foreign matter having a particle size of about 5 μm was mixed in the fuel gas, the fuel gas supply hole 12 could not be completely closed in the past. It is possible to crush foreign substances having a particle size of the order of magnitude.
[0026]
As described above, since the fuel gas control mechanism 10 is configured to use the pressure of the compressed air as the driving force of the fuel gas adjusting valve 13, the fuel gas adjusting valve 13 is driven with a driving force larger than the solenoid coil 6. And the urging force of the fuel gas regulating valve 13 by the spring 17 can be increased. Since the urging force of the fuel gas adjusting valve 13 can be set to be large, the fuel gas supply hole 12 can be completely closed even when minute foreign matter is mixed in the fuel gas.
[0027]
Further, as the compressed air used in the fuel gas control mechanism 10, the control air used when starting the gas engine 50 can be used, and there is no need to store the compressed air exclusively for the fuel gas control mechanism 10, so that the cost is low. The fuel gas control mechanism 10 can be configured. Thus, the fuel gas control mechanism 10 that can appropriately supply the fuel gas to the combustion chamber can be configured at low cost.
[0028]
Further, by appropriately supplying the fuel gas to the combustion chamber, the output efficiency of the gas engine 50 can be improved, and the durability can be improved. Further, since the combustion of the fuel gas in the combustion chamber is performed optimally, the safety of the gas engine 50 can be improved. Further, it is possible to configure the gas engine 50 that does not require the operation of removing fine foreign matter in the fuel gas.
[0029]
Although the present embodiment has been described using the spring 17 as the urging means, the fuel gas adjusting valve 13 may be urged by an urging means other than the spring 17. Although the three-way valve is used as the electromagnetic valve 24 to control the inflow and outflow of the compressed air into and from the pressurized chamber 20, the electromagnetic valve is installed for the inflow and outflow of the compressed air, and the compressed air is supplied. It may be configured to control.
[0030]
【The invention's effect】
As described above, according to the fuel gas control mechanism of the present invention, the fuel gas control valve is opened and closed by using the hydraulic cylinder that uses the pressure of the working fluid as the driving force. A driving force stronger than the force can be obtained, and the urging force of the fuel gas regulating valve can be increased. Thereby, even if minute foreign matter is mixed in the fuel gas, the fuel gas supply path can be reliably closed. Further, since the compressed air used for operating the internal combustion engine is used as the working fluid, the fuel gas control mechanism can be configured at low cost.
[0031]
Further, according to the internal combustion engine of the present invention, the fuel gas supply device having the above-described fuel gas control mechanism is used, and the fuel gas supply path can be reliably closed. The supply amount is optimally controlled, and the output efficiency of the internal combustion engine can be improved, and the durability can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a fuel gas control mechanism according to an embodiment of the present invention. FIG. 1A shows a valve closed state, and FIG. 1B shows a valve open state.
FIG. 2 is a schematic side view of a gas engine according to one embodiment of the present invention.
FIG. 3 is a view of the gas engine in FIG.
FIG. 4 is a schematic sectional view showing a conventional fuel gas control mechanism.
[Explanation of symbols]
9 fuel gas supply path 10 fuel gas control mechanism 11 air cylinder (fluid pressure cylinder)
12 fuel gas supply hole 13 fuel gas regulating valve 17 spring (biasing means)
24 solenoid valve (working fluid adjustment valve)
50 Gas engine (internal combustion engine)
52 Fuel gas supply device

Claims (4)

A fuel gas control mechanism comprising: a fuel gas supply path that supplies fuel gas to a combustion chamber of an internal combustion engine; and a fuel gas adjustment valve that opens and closes the fuel gas supply path to control a supply amount of the fuel gas.
A hydraulic cylinder that drives the fuel gas adjusting valve, a working fluid adjusting valve that controls inflow and outflow of a working fluid that is a driving force of the hydraulic cylinder, and a control unit that controls an operation of the working fluid adjusting valve. A fuel gas control mechanism characterized by comprising: The fuel gas control mechanism according to claim 1,
The fluid pressure cylinder includes an airtight casing, a movable member that transmits a driving force due to the pressure of the working fluid to the fuel gas adjustment valve, and an urging force that urges the fuel gas adjustment valve in a sealing direction. And a fuel gas control mechanism. The fuel gas control mechanism according to claim 1 or 2,
A fuel gas control mechanism, wherein compressed air used for operating the internal combustion engine is used as the working fluid. An internal combustion engine using a fuel gas supply device provided with the fuel gas control mechanism according to any one of claims 1 to 3.

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