JPH109062A - Gas engine using liquid fuel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently start a gas engine even at the time of extremely low temperatures where vaporization of liquid fuel hardly takes place. SOLUTION: The gas engine 1 is so constituted that liquid fuel from a liquid fuel storing tank 12 is led to a vaporization pressure adjusting device 14, and liquid fuel is vaporized by the vaporization pressure adjusting device, so that gaseous fuel turned out to be atmospheric pressure, is thereby led to a mixing device 3. A hot liquid jacket part 25 is formed in the vaporization pressure adjusting device 14, an outward bound conduit 71 communicated with a cooling water jacket part 70 for the engine and a return conduit 72, are connected with the hot liquid jacket part 25, and a heating device 73 increasing the temperature of coolant is provided for the outbound conduit 71. Since the starting switch 74 of the heating device is rendered effective upon actuating a starter switch 67 to a starting position so as to allow coolant to be thereby heated, vaporization of liquid fuel is accelerated, so that the startability of the engine is thereby enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas engine using liquid fuel, and more particularly, to a gas engine with improved startability.

[0002]

2. Description of the Related Art Various types of gas engines for working machines using liquid fuel such as LPG have been proposed. FIG. 5 is a schematic diagram showing the configuration of the general-purpose gas engine. FIG.
In the gas fuel engine 88 shown in FIG. 7, a liquid fuel tank 89 as gas fuel supply means is supplied to a vaporization pressure adjusting device 91 (a type of this device 91 includes a vaporizer) by a liquid fuel supply pipe 90, and the vaporizing pressure adjusting device 91 The fuel gas adjusted in the step (a) is supplied to a mixer device 93 via a gas fuel supply pipe 92, where the gas fuel and the air from the air cleaner 95 are mixed in the mixer device 93, and the mixture is passed through an intake passage 94. It is configured to supply to the combustion chamber 96 of the engine. In addition, as the vaporization pressure adjusting device 91, only the negative pressure of the intake passage 94 is used.
A so-called zero pressure adjusting device 91 for supplying the gas fuel in 1 to a mixer device 93 is known.

The zero pressure adjusting device 91 has a primary pressure chamber for vaporizing liquid fuel and a secondary pressure chamber for adjusting the pressure to almost the atmospheric pressure. A warm liquid jacket portion 97 for flowing the coolant of the engine is formed in the adjusting device 91, and the coolant jacket portion 100 and the warm liquid jacket portion 97 of the engine are connected by a forward conduit 98 and a return conduit 99, and the coolant circulates. It is configured to be able to.

[0004]

However, the coolant of the engine becomes hot only when the engine is started and the cylinder block and the cylinder head are warmed up. Therefore, in a gas engine employing propane as a liquid fuel, for example,-
When the engine is to be started at an extremely low temperature of 20 ° C. or lower, there is a problem that the liquid fuel is not sufficiently vaporized in the primary pressure chamber, and as a result, the start of the engine becomes difficult or impossible.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to start a gas engine satisfactorily even when starting a gas engine at a very low temperature where vaporization of liquid fuel does not easily occur. It is an object of the present invention to provide a gas engine using a liquid fuel.

[0006]

According to a first aspect of the present invention, there is provided a gas engine using a liquid fuel, wherein a liquid fuel from a liquid fuel supply means is supplied to a vaporizing pressure adjusting device as shown in FIGS. And the mixture is supplied to the mixer device 3, the air and the vaporized fuel are mixed in the mixer device 3, and the mixture is supplied to the combustion chamber 5 of the engine. A gas engine having a configuration in which a heating passage 25 through which air flows and a circulation path including an outward path 71 and a return path 72 for flowing the engine coolant through the heating path 25 is provided. It is characterized in that a heater means 73 for heating the coolant at the time of starting is provided. In addition, the forward path 71 is preferable as a position where the heater means 73 is provided in the circulation path, in consideration of a position where the coolant flowing into the heating flow path 25 can be immediately heated. Further, as a method of driving the heater means 73 at the time of starting the engine, there is a method of interlocking with a starter switch of the engine.

In the gas engine using liquid fuel according to the second aspect, for example, as shown in FIG. 1, a selection means 74 for an operator to select whether or not to heat the heater means 73.
And a heater 73 based on the output of the selector 74.
Is performed. In the gas engine using liquid fuel according to claim 3, for example, as shown in FIG. 4, the liquid fuel from the liquid fuel supply means 12 is supplied to the mixer device 3 via the vaporization pressure adjusting device 14, and the mixer device 3 In a gas engine configured to mix air and vaporized fuel and supply the air-fuel mixture to a combustion chamber 5 of the engine, the gas engine further includes a vibration imparting unit 76 that vibrates the liquid fuel at least at the time of starting the engine. I do.
In addition, as a form in which the liquid fuel is vibrated by the vibration applying means 76, a configuration in which the entire vaporization pressure adjusting device 14 is vibrated, a configuration in which only the chamber of the vaporization pressure adjusting device 14 in which the liquid fuel is vaporized, a liquid fuel supply means A configuration in which a part of the gas pipe 13 reaching from the vapor pressure control device 14 to the vaporization pressure adjusting device 14 may be considered.

[0008]

According to the first aspect of the present invention, at least a heater means for heating the coolant at the time of starting the engine is provided at a predetermined portion of the circulation path including the outward path and the return path, so that the coolant is supplied. Since the temperature can be increased without being affected by the outside air temperature, the vaporization of the fuel in the vaporization pressure adjusting device is promoted. Therefore, even when the temperature around the engine is extremely low, the vaporization pressure adjusting device can satisfactorily supply liquid fuel as gas fuel to the mixer device, so that the engine startability can be improved.

According to the second aspect of the present invention, since the selection means for selecting whether or not to heat the heater means is provided by the operator, the heater means is used only when the liquid fuel is hardly vaporized at an extremely low temperature. The engine coolant can be heated, and the startability of the engine can be improved by operating the selection means when the engine is not started well. According to the invention of claim 3, by vibrating the liquid fuel by the vibration applying means at least at the time of starting the engine, the energy of the vibration is converted into heat energy, and the temperature of the liquid fuel rises to promote vaporization. Can be. Further, the vibration of the liquid fuel increases the contact area between the air and the liquid fuel, so that the vaporization can be promoted. By applying the vibration in this manner, the vaporization of the liquid fuel can be promoted without using fire.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a gas engine using liquid fuel according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a gas engine according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing a detailed configuration of a vaporization pressure adjusting device that vaporizes liquid fuel and adjusts the pressure of vaporized gas. FIG. 3 is an enlarged vertical sectional view showing a state around a bypass passage forming portion of the vaporization pressure adjusting device.

The gas engine 1 guides liquid fuel from a liquid fuel storage tank 12 as a liquid fuel supply means to a vaporization pressure regulator 14 by a gas pipe 13, and the vapor pressure is adjusted to approximately atmospheric pressure by the vapor pressure regulator 14. The gas fuel is supplied to the gas fuel supply nozzle 16 of the mixer device 3 by the gas pipe 15.
To lead to. Further, the air from the air cleaner 2 is guided to the intake passage 4 via the mixer device 3, and the gas fuel and the air are mixed in the mixer device 3 to form an air-fuel mixture.
The mixture is supplied to the combustion chamber 5.
The vaporization pressure adjusting device 14 is divided into a primary pressure chamber 21 and a secondary pressure chamber 22 as shown in FIG. 2. The primary pressure chamber 21 vaporizes the liquid fuel to reduce the pressure of the fuel gas, and the secondary pressure chamber 21. Numeral 22 reduces the reduced pressure of the fuel gas to approximately the atmospheric pressure. Vaporization pressure controller 14
Around the primary pressure chamber 21, a warm liquid jacket portion 25 through which the engine coolant circulates is formed, and is configured to promote vaporization.

As shown in FIG. 1, the hot liquid jacket 25
Is connected to a forward conduit 71 and a return conduit 72 which communicate with a coolant jacket portion 70 of the engine, and circulates the heated coolant after the engine is started, thereby promoting the vaporization of the liquid fuel in the primary pressure chamber 21. I am trying to do it. Further, in the gas engine 1, a heater device 73 for increasing the temperature of the cooling liquid is provided at a predetermined position on the side of the hot liquid jacket portion 25 of the outward conduit 71. Heater device 7
A well-known heating device can be used as 3, and the heater device 73 is configured to move in conjunction with a starter switch 67 of the engine. That is, when the starter switch 67 of the engine is operated to the start position 68, the heater device 73
Is turned on. The heating time of the heater device 73 is determined by the starter switch 67.
May be the time during which the heater device 73 is operated at the start position 68, or the heating state of the heater device 73 may be maintained for a predetermined time (for example, 10 seconds) after being operated at the start position 68. Further, the heater device 73 may be configured to maintain the heating state during the operation of the engine.

Further, only when a glow plug used for a diesel engine or the like is turned on, the heater device 73 is turned on.
At normal temperature, the heater device 73 is driven.
Is not driven, and the vaporization of the liquid fuel can be promoted only at an extremely low temperature such as 20 ° C. below zero.
Further, a selection switch for selecting whether or not to heat the heater device 73 is provided by an operator, and the selection switch (for example, indicated by a start switch 74) is directly set as shown by an alternate long and short dash line arrow 75 in FIG. By operating, the heating of the heater device 73 may be started.

In the gas engine 1, a throttle valve 6 is provided at a position of the intake passage 4 on the combustion chamber 5 side of the mixer device 3 so as to adjust the amount of air-fuel mixture. The throttle valve 6 is connected to a governor lever 8 by a connecting rod 7.
The governor lever 8 is configured to be connected and driven to a speed adjusting lever 10 via a governor spring 9.
The governor lever 8 is pivotally supported by a pivot shaft 18 and is provided with a balance between a tension of a governor spring 9 biasing the fuel increasing side and a governor force 11 generated based on a centrifugal force of a governor weight (not shown). 6 is adjusted. Instead of an electronically controlled governor,
By employing the mechanical governor 17 as described above, the unit price of the engine can be reduced.

At a predetermined position of the intake passage 4 closer to the combustion chamber 5 than the throttle valve 6, an intake negative pressure communication passage 51 communicating with the boost lock chamber 48 of the vaporizing pressure regulator 14 is provided. The fuel lock mechanism 23 is configured to operate. Hereinafter, an invention that can further improve the engine startability in addition to the improvement of the engine startability by providing the heater device 73 will be described. The vaporizing pressure adjusting device 14 includes a negative pressure fuel lock mechanism 23 (see FIG. 2) for preventing gas fuel from being supplied to the mixer device 3 when the negative pressure of the intake passage 4 is less than a predetermined value. Have. The negative pressure fuel lock mechanism 23 is provided with a shut-off valve that is linked to the value of the negative pressure in the intake passage 4.
As long as the negative pressure does not exceed a predetermined value, the supply of gaseous fuel from the vaporization pressure regulator 14 is shut off by the shutoff valve. That is, when the engine is not driven, the pressure in the intake passage 4 is equal to the atmospheric pressure, so that the gas fuel is not supplied to the mixer device 3 by the shut-off valve before the engine is started. .

However, in the case of the gas engine using the mechanical governor 17 shown in FIG. 1, the governor force 11 does not work before the engine starts, so the governor spring 9 pulls the governor lever 8 toward the fuel increasing side. Normally, the throttle valve 6 linked to the governor lever 8 is fully opened. As described above, the negative pressure fuel lock mechanism 23 is configured such that the gas fuel is not supplied to the mixer device 3 unless the negative pressure of the intake passage 4 becomes larger than a predetermined value. 6 is large (for example, governor spring 9
(In the case of the fully opened state), the negative pressure fuel lock mechanism 23 does not increase by more than a predetermined value.
Is not released, gas fuel is not supplied to the mixer device 3,
The engine cannot be started.

Conventionally, to start the engine in such a gas fuel engine, the throttle valve 6 must be manually operated.
Is operated to adjust the opening degree so that the intake negative pressure becomes equal to or more than a predetermined value.
゜ If the fully opened angle is 90 °, the throttle valve 6
The opening degree of the engine is set to 10 ° to 15 ° to start the engine. In this case, the starter switch must be operated with one hand while operating the throttle valve 6 with the other hand, and the start-up operation becomes complicated, and if the opening of the throttle valve 6 is not properly adjusted, the engine must be operated properly. Since the engine cannot be started, the operability of the engine is reduced.

The vapor pressure adjusting device 14 is provided with a bypass passage forming portion 26 so as to solve the problem of engine operability.
Is characterized in that it is provided. Hereinafter, the configuration of the vaporization pressure adjusting device 14 will be described in detail mainly with reference to FIGS. 2 and 3. As shown in FIG. 2, the vaporization pressure adjusting device 14 includes a device base 20, a primary pressure chamber 21 for vaporizing the liquid gas fuel and adjusting the primary gas pressure to a primary pressure, and a pressure adjusted by the primary pressure chamber 21 being substantially equal to the atmospheric pressure. A secondary pressure chamber 22 that adjusts the pressure, a negative pressure fuel lock mechanism 23 that shuts off gas fuel from being supplied to the mixer device 3 when the negative pressure in the intake passage 4 is smaller than a predetermined value, and a secondary pressure chamber that is supplied at idle. Idle fuel adjustment mechanism 24 for adjusting the amount of fuel
And the device base 2 so as to promote vaporization of the primary pressure chamber 21.
It is configured to include a hot liquid jacket portion 25 formed at zero and a bypass passage forming portion 26 that allows the gas fuel in the primary pressure chamber 21 to flow to the secondary pressure chamber 22 only when the engine is started.

Each of the primary pressure chamber 21 and the secondary pressure chamber 22 is formed by providing two chambers in the device base 20, and the primary pressure chamber 21 and the secondary pressure chamber 22 communicate with each other through a communication hole 27. Have been. Further, a negative pressure fuel lock mechanism 23 is provided between the primary pressure chamber 21 and the secondary pressure chamber 22. In the primary pressure chamber 21, the gas fuel storage tank 1
The suction port 28 to which the gas pipe 13 from the second 2 communicates is connected to the valve body 29
A first lever 30 that adjusts the inflow amount of the liquid gas fuel by contacting with a pressure, a diaphragm 31 that forms the primary pressure chamber 21 and adjusts the pressure, and a diaphragm 3
A pressing spring 32 for urging the first lever 30 toward the secondary pressure chamber 22 through the first lever 30 and a valve body 29 of the first lever 30
Has an urging spring 34 for pressing the contact portion 33 of the first lever 30 so as to press against the suction port 28. The first lever 30 is swingably supported by a fulcrum shaft 35 attached to the base body 20 of the vaporization pressure adjusting device 14. One end on the suction port 28 side serves as a valve body 29, and the other end contacts. The section 33 is provided. The pressing spring 32 is provided with an adjusting screw 37 for adjusting the spring force of the pressing spring 32.

When the amount of liquid fuel entering the primary pressure chamber 21 from the suction port 28 decreases, the pressure in the primary pressure chamber 21 defined by the diaphragm 31 decreases, and the pressure determined by the pressing spring 32 and the diaphragm 31 decreases. The pressure pushes the contact portion 33 of the first lever 30 toward the secondary pressure chamber 22 (left side). As a result, the gap between the valve body 29 and the suction port 28 widens, and the amount of liquid fuel flowing into the primary pressure chamber 21. Work in the direction of increasing pressure. When the pressure in the primary pressure chamber 21 exceeds a certain value, the diaphragm 31 expands,
The contact portion 33 is pushed rightward by the force of the urging spring 34, the valve body 29 closes the gap between the suction ports 28, and operates in a direction to suppress the inflow of liquid fuel. By such an operation, the pressure of the gas fuel in the primary pressure chamber 21 is controlled to a substantially constant range (200 to 300 mmAq).

The primary pressure chamber 21 and the secondary pressure chamber 22 communicate with each other through a communication hole 27, and the communication hole 27 is pressed by the valve body 41 of the second lever 40 so that the primary pressure chamber 21 is separated from the primary pressure chamber 21. The amount of gas fuel flowing into the secondary pressure chamber 22 is adjusted. The second lever 40 is a fulcrum shaft 4
2, one end on the side of the communication hole 27 is a valve body 41, and two contact portions are provided on the other end. At a position near the fulcrum shaft 42 on the other end side of the second lever 40, a pressing spring 43 that presses the valve body 41 of the second lever 40 against the communication hole 27 by rotating the second lever 40 is provided. ing. Also, the second
A boost contact portion 44 is formed at the other end of the lever 40 at the other end. Further, an aisle contact portion 46 is formed near the inside on the other end side of the second lever 40, and an idle adjustment protrusion 45 described below contacts the idler contact portion 46.

The negative pressure fuel lock mechanism 23 is connected to the primary pressure chamber 21.
Lock chamber 4 provided between the pressure chamber and the secondary pressure chamber 22
8, the diaphragm 49 is configured to urge the boost contact portion 44 toward the secondary pressure chamber 22 (left side) by the boost spring 50, and the boost lock chamber 48 is suctioned into the intake passage 4. It is configured to be connected via a pressure communication pipe 51. If the negative pressure in the intake passage 4 does not exceed a predetermined value, the boost contact portion 44 is pushed up to the left by the pressing force of the boost spring 50, and the valve body portion 41 of the second lever 40 is strongly pressed against the communication hole 27. Then, by preventing the gas fuel from flowing into the secondary pressure chamber 22, the supply of the fuel is shut off (locked).

On the other hand, when the negative pressure in the intake passage 4 exceeds a predetermined value and increases, the negative pressure in the boost lock chamber 48 increases through the intake negative pressure communication pipe 51 and the boost spring 5
The diaphragm 49 is opposed to the primary pressure chamber 21 against the pressing force of 0.
It is pulled to the side (right side), releasing the pressure on the boost abutment 44 and allowing gaseous fuel to flow into the secondary pressure chamber 22. The idling fuel adjustment mechanism 24 has an idle adjustment lever 53 swingably supported by a support shaft 52 provided on the left side wall of the device base 20, and the idle adjustment lever 53 is engaged with an idle adjustment screw 54. The screw-side contact portion 55 and the idle adjustment protrusion 45 are connected to the primary pressure chamber 2.
And an engagement portion 57 having a spring 56 that urges one side (right side). For example, the idle adjustment lever 53
Is moved downward, against the support spring 59,
When the screw-side contact portion 55 moves as indicated by an arrow 86 and the idle adjustment lever 53 pivots about the support shaft 52 as a lever, the pressing force of the spring 56 of the engagement portion 57 increases.

Due to the increase in the spring force, the idle adjustment projection 45 fixed to the central portion of the diaphragm 58 of the secondary pressure chamber 22 moves to the primary pressure chamber 21 side. The rightward movement of the idle adjustment projection 45 causes the second lever 4 to move.
It can be adjusted so that the pressure contact force of the zero valve body portion 41 becomes weak and the gas fuel supply amount during idling operation increases. In addition,
The diaphragm 58 of the secondary pressure chamber 22 expands and contracts according to the magnitude of the pressure of the gaseous fuel exiting from the insertion hole 27, and supplies the gas to the mixer device 3 regardless of the magnitude of the pressure of the gaseous fuel exiting the insertion hole 27. It is provided to make the pressure of the gas fuel substantially equal to the atmospheric pressure.

As shown in FIG. 3, the bypass passage forming portion 26 is provided with a primary pressure chamber 21 formed in the apparatus base 20 and a secondary pressure separate from a communication hole 27 between the primary pressure chamber 21 and the secondary pressure chamber 22. A bypass passage 61 communicating with the chamber 22 and a starting jet 62 provided in a part of the bypass passage 61
And a starting solenoid 63 having a valve element 64. By operating the valve body 64, the starting solenoid 63 can control a state in which the valve is closed by pressing against the starting jet 62 and a state in which a gap is formed between the starting jet 62 and the valve body 64 and the valve is opened. Like that. The control of the valve body 64 is performed in conjunction with the operation of the switch position of the starter switch 67 as described later.

The operation of the gas fuel engine having the above configuration will be described. When the starter switch 67 is turned to the start position 68 when the engine is started, the starter of the engine is started, the cooling water pump is driven by the rotation of the crankshaft, and the start switch 74 is turned on. It is heated, and the vaporization of the liquid fuel in the primary pressure chamber 21 is promoted. Also, the starter switch 67
Is operated to the starting position 68, the drive switch 65 of the starting solenoid 63 is short-circuited, and the valve body 64 of the starting solenoid 63, which is set to be always closed, is opened. In this state, the starting gas flows from the primary pressure chamber 21 to the secondary pressure chamber 22 through the bypass passage 61 irrespective of the operation of the valve body 41 of the second lever 40 that is in pressure contact with the communication hole 27, and Is supplied with gaseous fuel. At the time of starting the engine, the throttle valve 6 is fully opened and the negative pressure in the intake passage 4 is not high, so that the negative pressure fuel lock mechanism 23 operates to transfer the fuel from the primary pressure chamber 21 to the secondary pressure chamber 22. Supply is the second lever 4
Blocked by 0. However, even in this state, according to the configuration of the present embodiment, the gas fuel vaporized by the bypass passage 61 is supplied to the mixer device 3, so that the startability of the engine can be improved.

When the engine is started by the gas fuel supplied from the bypass passage 61, the governor force 11 acts and the opening of the throttle valve 6 is controlled so that the governor force 11 and the governor spring 9 can be balanced. , The negative pressure fuel lock mechanism 23 is released, and the gas fuel is supplied from the communication hole 27. Also,
In a state where the starter switch 67 is returned from the start 68 to the operation position 69, the starting solenoid 63 is protruded, the starting jet 62 is closed, and combustion is performed by the gas fuel from the communication hole 27. Transition. With this configuration, the negative pressure fuel lock mechanism 23
, The engine can be easily started. Further, the engine can be started satisfactorily without being affected by the opening of the throttle valve 6 before the engine is started, which is determined by the position of the speed adjustment lever 10 and the like.

[0028]

Second Embodiment FIG. 4 is a schematic diagram showing a configuration of a gas engine according to a second embodiment of the present invention. A feature of the second embodiment is that a vibration device 76 such as a piezoelectric element for vibrating the vaporization pressure adjusting device 14 is provided without providing the heater device in the first embodiment, and a starter switch 6 of the engine is provided.
The point is that when the device 7 is operated to the starting position 68, the vibration device 76 is driven to promote vaporization in the primary pressure chamber 21. What is vibrated by the vibration device 76 may be the entire vaporization pressure adjusting device 14 as described above, a configuration in which the inside of the primary pressure chamber 21 vibrates, or a configuration in which a part of the gas pipe 13 vibrates.

By providing the vibration device 76 in this manner, the kinetic energy of the vibration is converted into heat energy,
While the vaporization of the liquid fuel is promoted, the air and the liquid fuel in the primary pressure chamber 21 are stirred by the vibration, the contact area between the air and the liquid fuel is increased, and the vaporization is promoted. In particular, when the primary pressure chamber 21 vibrates, liquid fuel adheres to the inner wall surface of the primary pressure chamber 21 to promote vaporization.

The present invention is not limited to the above-described embodiment, but can be implemented with various modifications within the gist of the present invention. Hereinafter, such an embodiment will be described. (1) In the circulation path, as a place where the heater device 73 is provided, even at the position of the return conduit 72, the temperature of the coolant can be raised immediately depending on the capacity of the heater device 73, and even in this case, the start of the engine is enhanced. be able to. (2) In the above-described embodiment, at least at the time of starting the engine, the heater device 73 is linked with the starter switch 67. However, the temperature of the engine coolant is equal to or lower than a certain temperature by using a thermostat, a temperature sensor, or the like. In this case, the heater device 73 may be heated. Further, since the engine coolant rises rapidly after the engine is started, the heating of the heater device 73 can be stopped when the temperature of the engine coolant reaches a certain temperature or higher.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram illustrating a basic configuration of a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a detailed configuration of a vaporization pressure adjusting device.

FIG. 3 is an enlarged longitudinal sectional view showing a state around a bypass passage forming portion of the vaporization pressure adjusting device.

FIG. 4 is a schematic block diagram illustrating a basic configuration of a second embodiment of the present invention.

FIG. 5 is a schematic block diagram showing a configuration of a gas engine using a conventional liquid fuel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 3 ... Mixer apparatus, 12 ... Liquid fuel storage tank, 14 ... Vaporization pressure adjustment apparatus, 25 ... Hot liquid jacket part, 71 ... Outgoing conduit, 72 ... Return conduit, 73 ... Heating device, 74 ... Start switch, 76 ... Vibration device .

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location F02M 21/02 F02M 21/02 U F02N 17/06 F02N 17/06 B

Claims (3)

[Claims] 1. A liquid fuel from a liquid fuel supply means (12) is supplied to a mixer device (3) via a vaporization pressure adjusting device (14), and air and vaporized fuel are mixed in the mixer device (3). The mixture is supplied to a combustion chamber (5) of the engine, and a heating flow path (25) for flowing a coolant of the engine is formed in the vaporization pressure regulator (14). The forward path (71) and the return path (7) for flowing to the heating flow path (25)
2) A gas engine having a circulation path comprising a liquid fuel, wherein a heater means (73) for heating a coolant is provided at a predetermined position of the circulation path at least when the engine is started. The gas engine used. 2. An apparatus according to claim 1, further comprising a selection means for selecting whether or not to heat said heater means, wherein heating of said heater means is performed based on an output of said selection means. A gas engine using the liquid fuel according to claim 1. 3. A liquid fuel from a liquid fuel supply means (12) is supplied to a mixer device (3) via a vaporization pressure adjusting device (14), and air and vaporized fuel are mixed in the mixer device (3). A gas engine configured to supply the air-fuel mixture to a combustion chamber (5) of the engine, comprising a vibration applying means (76) for vibrating the liquid fuel at least when the engine is started. Gas engine.