JP2002130056A - Fuel supply device for gas engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply device for gas engine capable of automatically eliminating the entrained oil collected inside an oil collection filter so as to eliminate the maintenance work and so as to eliminate a necessity of replacing the oil collection filter. SOLUTION: This fuel supply device for gas engine is provided with an intake air pipe of a gas engine using the fuel gas, an air-fuel mixture generating device provided on the way of the intake air pipe, a gas supply pipe connected to the air-fuel mixture generating device so as to supply the fuel gas, a gas adjuster valve device installed on the way of the gas supply pipe so as to appropriately adjust the quantity of the fuel gas, an oil collection filter installed on the way of the gas supply pipe in the upstream of the gas adjuster valve device so as to collect the oil entrained in the fuel gas, a connecting pipe for connecting the oil collection filter to the intake air pipe, a normally close selector valve installed on the way of the connecting pipe, and an operating means for temporarily opening the selector valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply system for a gas engine for removing oil from an oil collecting filter for collecting oil mixed in fuel gas.

[0002]

2. Description of the Related Art In general, a gas engine using a fuel gas such as compressed natural gas or LPG (for example, Japanese Patent Application Laid-Open No. H11-173)
216), it is necessary to control the fuel supply amount every moment and accurately according to changes in the engine operating state in order to ensure output performance and exhaust gas performance.

For this purpose, for example, a gas regulating valve device is mounted in a gas supply pipe for sending compressed natural gas. The gas regulating valve device includes a hot-wire anemometer composed of a flow rate detector for detecting the flow rate of the fuel gas, and a regulating valve. By referring to the gas flow rate measured by the hot wire anemometer in the control circuit, the opening of the regulating valve is feedback controlled,
An appropriate amount of compressed natural gas is sent.

On the other hand, in a rapid filling station for a compressed natural gas engine vehicle (corresponding to a gas station of a gasoline vehicle), a compressor is used to supply high-pressure compressed natural gas to a fuel container of the compressed natural gas engine vehicle. ing. When supplying the compressed natural gas, the oil for lubricating the compressor may be mixed into the compressed natural gas filled in the fuel container and become mixed oil.

[0005] In such a case, there is a possibility that the measurement accuracy of the gas flow rate measured by the hot wire anemometer cannot be ensured because oil mixed in the hot wire anemometer adheres. Therefore, it is difficult to optimally control the state of the opening degree of the adjustment valve, and for example, it may be difficult to secure output performance and exhaust gas performance. Therefore, an oil collecting filter for separating and collecting oil mixed in the compressed natural gas flowing through the gas supply pipe is required.

Referring to FIG. 8, an example of a fuel supply device for a single point injection type compressed natural gas engine having such an oil collecting filter will be described. In the figure, a compressed natural gas engine 1 includes a cylinder head 2
have. A branch pipe 4A of an intake manifold 4 is connected to the cylinder head 2 for each intake port 3 of each cylinder.

[0007] An intake pipe 5 for introducing air is connected to the intake manifold 4 via an air filter (not shown). An air-fuel mixture generator 6 for mixing compressed natural gas and air is mounted in the middle of the intake pipe 5, and a throttle valve 6A is mounted on a downstream portion 5A of the air-fuel mixture generator 6 of the intake pipe 5.

[0008] One end 7A of a gas supply pipe 7 for sending compressed natural gas to the air-fuel mixture generator 6 is connected. In the middle of the gas supply pipe 7, from the upstream side, a plurality of fuel containers 8, 8 for storing compressed natural gas, a fuel cutoff valve 9, a regulator 10 for adjusting the pressure of the compressed natural gas, and oil collection Filter 11 and a gas regulating valve device 12 are sequentially mounted.

The fuel supply port 1 is provided at the other end 7B of the gas supply pipe 7.
3 are provided. The compressed natural gas is filled into the fuel containers 8 via the fuel filling port 13.
The above-described gas regulating valve device 12 includes a flow rate detecting unit 12A that detects a flow rate of the fuel gas, and a regulating valve 12B.
The flow rate detector 12A is connected to the input side of the control means 14 for the regulating valve, and the output side of the control means 14 is connected to the regulating valve 12B. For example, a hot wire anemometer is used as the flow rate detection unit 12A. The control means 14 determines whether or not the flow rate of the compressed natural gas is an appropriate amount with reference to the optimum air-fuel ratio. Based on the determination, the opening degree of the regulating valve 12B is feedback-controlled, and the appropriate amount of the compressed natural gas is accurately determined. It is being sent.

The oil collecting filter 11 is mounted on a portion 7 C of the gas supply pipe 7 upstream from the gas regulating valve device 12. When the compressed natural gas is filled and supplied to the fuel containers 8 and 8, even if the oil for lubricating the compressor is mixed into the compressed natural gas to become mixed oil, the mixed oil is mixed into the compressed natural gas by the oil collecting filter 11. The mixed oil thus separated is collected from the compressed natural gas.

The oil collecting filter 1 is periodically
The oil collecting filter 11 is maintained by extracting the mixed oil deposited in the outside 1 or replacing the oil collecting filter 11 with a new one.

[0012]

However, in the conventional fuel supply device of the compressed natural gas engine 1, after the oil mixed in the fuel gas is collected in the oil collecting filter 11, the oil is collected. The maintenance work of the contents described above for the filter 11 is required, and this maintenance work is troublesome. Also, the oil collecting filter 1
There is a problem that the cost of parts for replacing 1 is increased.

Further, in the fuel supply device of the multi-point injection type compressed natural gas engine, oil mixed in the fuel gas may adhere to the injector of the fuel injection device corresponding to each cylinder. It is desirable to mount an oil collecting filter for collecting mixed oil in the middle of the pipe. In this case as well, it is necessary to periodically maintain the oil collecting filter by extracting the mixed oil accumulated in the oil collecting filter to the outside or replacing the oil collecting filter. In other words, maintenance work was troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to eliminate a maintenance operation by automatically removing mixed oil trapped in an oil collecting filter. An object of the present invention is to provide a fuel supply device for a gas engine, which can eliminate replacement of an oil collecting filter.

[0015]

The invention according to claim 1 is
An intake pipe of a gas engine using fuel gas, an air-fuel mixture generation device provided in the middle of the intake pipe, a gas supply pipe connected to the air-fuel mixture generation device and sending fuel gas, and in the middle of the gas supply pipe. A gas regulating valve device that is mounted and adjusts a fuel gas to an appropriate amount, and is mounted on the gas supply pipe at a position upstream of the gas regulating valve device to collect oil mixed in the fuel gas. An oil collecting filter, a connecting pipe connecting the oil collecting filter and the intake pipe, a normally closed on-off valve mounted in the middle of the connecting pipe, and temporarily opening the on-off valve. Operating means for setting a state.

According to a second aspect of the present invention, there is provided an intake pipe for supplying air to each cylinder of a gas engine using fuel gas, a gas supply pipe for supplying fuel gas, and a common pipe connected to one end of the gas supply pipe. And a fuel injection device that is mounted on the common pipe corresponding to each of the cylinders and injects fuel gas into each of the cylinders, and is mounted in the middle of the gas supply pipe,
An oil collecting filter for collecting oil mixed in the fuel gas, a connecting pipe connecting the oil collecting filter and the intake pipe, and a normally closed state mounted in the middle of the connecting pipe. An on-off valve and operating means for temporarily opening the on-off valve are provided.

According to a third aspect of the present invention, in the gas supply system for a gas engine according to the first or second aspect, the operating means operates the on-off valve over an entire region or a part during an engine start period. It is a control means for opening the state. According to a fourth aspect of the present invention, there is provided an intake pipe of a gas engine using a fuel gas, an air-fuel mixture generation device provided in the middle of the air intake pipe, and a gas supply pipe connected to the air-fuel mixture generation device and sending a fuel gas. A gas regulating valve device mounted in the middle of the gas supply pipe to adjust a fuel gas to an appropriate amount; and a gas regulating valve device mounted in the middle of the gas supply pipe to be located on the upstream side of the gas regulating valve device. An oil collecting filter for collecting mixed oil, and a needle-hole-shaped thin tube connecting the oil collecting filter and the intake pipe are provided.

According to a fifth aspect of the present invention, there is provided an intake pipe for supplying air to each cylinder of a gas engine using a fuel gas, a gas supply pipe for supplying a fuel gas, and a common pipe connected to one end of the gas supply pipe. And a fuel injection device that is mounted on the common pipe corresponding to each of the cylinders and injects fuel gas into each of the cylinders, and is mounted in the middle of the gas supply pipe,
It is characterized by comprising an oil collecting filter for collecting oil mixed in fuel gas, and a needle-hole-shaped thin tube connecting the oil collecting filter and the intake pipe.

According to a sixth aspect of the present invention, there is provided an intake pipe of a gas engine using a fuel gas, an air-fuel mixture generating device provided in the middle of the air intake pipe, and a gas connected to the air-fuel mixture generating device for sending the fuel gas. A supply pipe, a gas adjustment valve device mounted in the middle of the gas supply pipe, and adjusting a fuel gas to an appropriate amount;
An oil collecting filter mounted on the gas supply pipe at a position above the gas regulating valve device to collect oil mixed in the fuel gas, the oil collecting filter, and the intake pipe; And a connection pipe having a constriction on the inner wall.

According to a seventh aspect of the present invention, there is provided an intake pipe for supplying air to each cylinder of a gas engine using fuel gas, a gas supply pipe for supplying fuel gas, and a common pipe connected to one end of the gas supply pipe. And a fuel injection device that is mounted on the common pipe corresponding to each of the cylinders and injects fuel gas into each of the cylinders, and is mounted in the middle of the gas supply pipe,
An oil collecting filter for collecting oil mixed in the fuel gas; and a connecting pipe connecting the oil collecting filter and the intake pipe and having a constricted portion on an inner wall. It is characterized by.

(Function) In the first and second aspects of the present invention, the following functions are provided. (B) For vehicles equipped with gas engine fuel supply devices,
Fuel gas such as high-pressure compressed natural gas is supplied to a fuel container of the vehicle by a compressor at a fuel filling station. At this time, oil for compressor lubrication is mixed into the fuel gas to become mixed oil, and the mixed gas may be contained in the fuel gas. When the mixed oil is contained in the fuel gas, the mixed oil in the fuel gas is collected in the oil collecting filter.

(B) For example, before the engine start period, the on-off valve is closed. The on-off valve is operated by
It is temporarily opened for a predetermined period. Since the pressure P2 of the fuel gas in the gas supply pipe is higher than the pressure P1 of the intake pipe, the mixed oil collected in the oil collecting filter is sucked through the connecting pipe by the pressure P2 of the fuel gas. It is sent into the pipe and removed from the oil collection filter.

(C) On the other hand, the opening / closing valve is returned to the closed state by the operating means after the end of the predetermined period. Therefore, even if the fuel gas supplied to the gas supply pipe is guided to the connection pipe, the fuel gas is blocked by the on-off valve and is not directly sent into the intake pipe. According to the third aspect of the invention, the on-off valve is closed before the engine start period.

The open / close valve is opened by the control means during the engine start period over the entire area or part of the engine start period. During the operation of the gas engine after the end of the period, the on-off valve returns to the closed state. According to the fourth and fifth aspects of the present invention, the mixed oil collected in the oil collecting filter is sent into the intake pipe through the needle-hole-shaped narrow pipe.

According to the sixth and seventh aspects of the present invention, the mixed oil collected in the oil collecting filter is sent into the intake pipe while receiving resistance from the constricted portion of the connecting pipe.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment (hereinafter referred to as "first embodiment") of a fuel supply system for a gas engine according to the first and third aspects of the present invention.
The present invention is applied to a single-point injection-type compressed natural gas engine as a gas engine. Parts having the same structure as those of the conventional example are denoted by the same reference numerals, description thereof will be omitted, and only different parts will be described.

In the figure, as in the conventional example, the oil collecting filter 11 is provided with a gas regulating valve device 12 of the gas supply pipe 7.
The oil collecting filter 11 is attached to the upstream portion 7 </ b> C to collect mixed oil contained in the compressed natural gas. It is connected to a portion 5A downstream from the device 6. The opening end 15A of the connection pipe 15 is located on the upstream side of the throttle valve 6A of the intake pipe 5.

An on-off valve 16 is mounted in the connecting pipe 15. The on-off valve 16 is normally closed. The opening / closing valve 16 is provided with an actuator 17, and the actuator 17 is connected to operating means including a control means 18. As shown in FIGS. 2 and 3, the control unit 18 opens the on-off valve 16 over the entire region T0 during the engine start period. The entire region T0 during the engine start period is a period from the start of the engine start (start position of the starter switch 20) to the completion of engine start (ON position of the starter switch 20).

The control means 18 and the entire area T0 during the engine start period will be described. The control means 18 is connected to a known engine starting circuit 19. The engine start circuit 19 has a starter switch 20, and a start position terminal 20 A and an ON position terminal 20 B of the starter switch 20 are connected to the control means 18. A signal (start position signal of the starter switch 20) at the time of engine start-up of the engine start circuit 19 is sent to the control means 18, and the actuator 17 is operated by this signal to control the on-off valve 16 from the closed state to the open state. It has become. The signal (the ON position signal of the starter switch 20) at the time of the completion of the engine start of the engine start circuit 19 is the control means 1
8, the actuator 17 is operated by this signal, and the on-off valve 16 is controlled from the open state to the closed state. In FIG. 3, reference numeral 19A denotes a starter motor for driving the compressed natural gas engine 1.

Next, the operation of the present embodiment will be described. (A) High-pressure compressed natural gas is supplied to the fuel containers 8, 8 by a compressor (not shown) at a fuel filling station through a fuel filling port 13 of a gas supply pipe 7 to a vehicle equipped with the compressed natural gas engine 1. Is done. At that time, when the oil for compressor lubrication is mixed into the compressed natural gas, the mixed oil may be contained in the compressed natural gas.

In this case, the oil mixed in the compressed natural gas is collected in the oil collecting filter 11. (B) Before the engine start period, the on-off valve 16 is in the closed state. When the starter switch 20 is turned from the OFF position to the start position, the compressed natural gas engine 1 is forcibly operated by the driving force of the starter motor 19A.

At the same time, the control means 18 controls the on-off valve 16
Is opened over the entire region T0 during the engine start period. Since the pressure P2 of the fuel gas in the gas supply pipe 7 is higher than the pressure P1 (intake pressure) of the downstream portion 5A of the air-fuel mixture generator 6 of the intake pipe 5, the fuel gas is captured in the oil collecting filter 11. The collected mixed oil is at the pressure P of the fuel gas.
2, the air is immediately sent into the downstream portion 5A from the air-fuel mixture generator 6 of the intake pipe 5 via the connecting pipe 15, and is removed from the oil collecting filter 11.

(C) On the other hand, during the operation period T1 of the compressed natural gas engine 1 from the end of the period T0, the on-off valve 1
6 is closed. Therefore, even if the compressed natural gas fed through the gas supply pipe 7 is guided to the connecting pipe 15,
And a portion 5 downstream of the air-fuel mixture generator 6 of the intake pipe 5
It is not sent to A. According to the above configuration, mixed oil collected in the oil collecting filter 11 is
By opening the on-off valve 16 over the entire region T0 during the engine start period, the intake pipe 5 is sent into the downstream portion 5A from the air-fuel mixture generator 6 and is automatically removed from the oil collecting filter 11. be able to. As a result, there is an effect that the operation of extracting the mixed oil from the oil collecting filter 11 is eliminated, the maintenance operation of the oil collecting filter 11 is eliminated, and the replacement of the oil collecting filter 11 is eliminated.

Further, since the compressed natural gas can be sent to the intake pipe 5 by bypassing the air-fuel mixture generator 6 over the entire region T0 during the engine start period, there is an effect that the starting supercharging can be performed. .

Further, when the compressed natural gas engine 1 is started, the oil collecting filter 11 is
The mixed oil can be removed from the gas control valve device 12 and the like, and the mixed oil can be reliably prevented from adhering to the gas regulating valve device 12 and the like. In the present embodiment, a natural gas engine has been described as an example of a gas engine. However, the present invention is not limited to this, and can be applied to, for example, an LPG engine.

In the present embodiment, the connecting pipe 1
The opening end 15A of the throttle valve 5 is connected to the throttle valve 6A of the intake pipe 5.
However, it may be located downstream of the throttle valve 6A of the intake pipe 5. Further, in the present embodiment, the entire region T0 during the engine start period is set.
The open / close valve is opened over a period of time, but the open / close valve 16 may be opened over a part of the engine start period.

For example, as shown in FIG. 4, the opening / closing valve 16 is opened during a period T3 (T0> T3) from the start of the engine start to the completion of the engine start. Thus, the on-off valve 16 can be closed. FIG. 5 shows an embodiment (hereinafter referred to as "Embodiment 2") of a fuel supply device for a gas engine according to the second and third aspects of the present invention, wherein a multipoint injection type compressed natural gas is used as the gas engine. Applied to the engine.

In the figure, the compressed natural gas engine 31
Has a cylinder head 32. A branch pipe 34A of an intake manifold 34 is connected to the cylinder head 32 for each intake port 33A of each cylinder 33.
An intake pipe 35 for introducing air is connected to the intake manifold 34 via an air filter (not shown).

A throttle valve 36 for adjusting the amount of air is mounted in the intake pipe 35. One end 37A of the gas supply pipe 37 is connected to a common pipe 37D,
A fuel injection device 38 is mounted on each of the 7Ds corresponding to each cylinder 33, and an appropriate amount of compressed natural gas is injected into each intake port 33A from the tip of an injector (not shown) of each fuel injection device 38. It is supposed to be.

In the middle of the gas supply pipe 37, from the upstream side,
Plurality of fuel containers 39, 39 for storing compressed natural gas
, A fuel cutoff valve 40, a regulator 41 for adjusting the pressure of the compressed natural gas, and an oil collecting filter 42 are sequentially mounted. The other end 37B of the gas supply pipe 37 is provided with a fuel filling port 37C. Fuel filling port 37C
Thus, compressed natural gas is filled in the fuel containers 39, 39.

The bottom portion 42 A of the oil collecting filter 42 is connected to the intake pipe 35 via the connecting pipe 43. The opening end 43A of the connecting pipe 43 is located on the upstream side of the throttle valve 36 of the intake pipe 5. An on-off valve 44 is mounted in the connection pipe 43. The on-off valve 44 is normally closed.

The opening / closing valve 44 is provided with an actuator 45, and the actuator 45 is connected to operating means comprising control means 46. The control means 46 is connected to a known engine starting circuit 47. The control means 46 opens the on-off valve 44 over the entire area T0 during the engine start period. The control unit 46 has the same function as the control unit 18 of the first embodiment (applies to FIGS. 2 and 3), and a description thereof will be omitted.

According to the present embodiment, the same operation and effect as those of the first embodiment can be obtained. Note that, in this embodiment, the above-described application example in Embodiment 1 can be applied.

FIG. 6 shows an embodiment (hereinafter referred to as "third embodiment") of a fuel supply device for a gas engine according to the invention of claim 4, wherein the gas engine is a single point injection type compression engine. Applied to a natural gas engine, the same parts as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described.

In the figure, the bottom 11A of the oil collecting filter 11 is connected to a portion 5A downstream of the air-fuel mixture generator 6 of the intake pipe 5 through a needle-hole-shaped thin tube 51. The open end 51A of the thin tube 51 is connected to the throttle valve 6 of the intake pipe 5.
A is located on the upstream side. The needle-hole-shaped thin tube 51 is a passage 5
1B, the diameter of which is such that the mixed oil can pass through at a minimum, and is determined by experiments or calculations.

The mixed oil collected in the oil collecting filter 11 is gradually sent into the suction pipe 5 through the needle-hole-shaped narrow pipe 51. The mixed oil is sent from the gas supply pipe 7 to the intake pipe 5 via the oil collecting filter 11 and the needle-hole-shaped thin pipe 51.
The engine performance is not adversely affected.

According to the present embodiment, the same operation and effect as those of the first embodiment can be obtained. In the present embodiment, the open end 51A of the thin tube 51 is located on the upstream side of the throttle valve 6A of the intake pipe 5, but may be located on the downstream side of the throttle valve 6A of the intake pipe 5. .
Further, in the present embodiment, a natural gas engine has been described as an example of a gas engine. However, the present invention is not limited to this and can be applied to, for example, an LPG engine. Further, the present invention can be applied to a compressed natural gas engine of a multipoint injection type as a gas engine (corresponding to claim 5). In this case, by attaching the needle-hole-shaped thin tube 51 of FIG. 6 from the oil collecting filter 42 of the gas supply tube 37 to the intake tube 35 of FIG. To play.

Further, in the third embodiment, the compressed natural gas is sent to the intake pipe 5 via the needle-hole-shaped narrow pipe 51, as shown in FIG. One embodiment of the fuel supply device for a gas engine according to the present invention (hereinafter, referred to as “Embodiment 4”) may be configured. Regarding the fuel supply device for a gas engine according to the fourth embodiment, the same components as those of the fuel supply device for the gas engine according to the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described. explain.

As shown in the figure, in Embodiment 4, the bottom 11A of the oil collecting filter 11 is
5, a portion 5 of the intake pipe 5 downstream from the air-fuel mixture generation device 6
A is connected. A constriction 52 made of an orifice is provided on an inner wall 15B in the middle of the connecting pipe 15. The opening end 15A of the connection pipe 15 is located on the upstream side of the throttle valve 6A of the intake pipe 5. The diameter of the constriction 52 is determined by experiment or calculation.

The mixed oil collected in the oil collecting filter 11 is gradually sent to the intake pipe 5 while receiving resistance from the constricted portion 52. In this case, the amount of the mixed oil flowing from the gas supply pipe 7 to the intake pipe 5 via the connecting pipe 15 is very small, so that the engine performance is not adversely affected. According to the fourth embodiment, the same effects as those of the first embodiment can be obtained. In the present embodiment, the opening end 15A of the connecting pipe 15 is located on the upstream side of the throttle valve 6A of the intake pipe 5, but may be located on the downstream side of the throttle valve 6A of the intake pipe 5. it can. Further, in the present embodiment, the orifice has been described as an example of the constricted portion 52. However, the present invention is not limited to this and may be, for example, a choke tube. Furthermore, in the present embodiment, a natural gas engine has been described as an example of a gas engine, but the present invention is not limited to this, and may be applied to, for example, an LPG engine. Further, the present invention can be applied to a multi-point injection type compressed natural gas engine as a gas engine (corresponding to claim 7). In this case, the connection pipe 15 provided with the constricted portion 52 (orifice, choke tube, etc.) shown in FIG. 7 is attached from the oil collection filter 42 of the gas supply pipe 37 to the intake pipe 35 of FIG. The same operation as in the first embodiment,
It works.

[0052]

According to the first and second aspects of the present invention, the mixed oil collected in the oil collecting filter is sent into the intake pipe by opening the on-off valve temporarily by the operating means. As a result, the mixed oil can be automatically removed from the oil collecting filter, so that there is an effect that the maintenance work of the oil collecting filter can be eliminated and the replacement of the oil collecting filter can be eliminated.

According to the third aspect of the invention, the control means causes the mixed oil collected in the oil collecting filter to open the on-off valve over the entire area or a part of the area during the engine start period. Can be sent into the intake pipe. Therefore, when the gas engine is started, the mixed oil is removed from the oil collecting filter using the starting circuit, and the mixed oil can be reliably prevented from adhering to the hot wire anemometer or the injector of the gas regulating valve device.

According to the fourth and fifth aspects of the present invention, the same effects as those of the first aspect of the invention can be obtained by the needle-hole-shaped thin tube. According to the sixth and seventh aspects of the present invention, the same effect as that of the first aspect of the invention is exerted by the constricted portion of the connecting pipe.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a fuel supply device for a gas engine according to a first embodiment.

FIG. 2 is an explanatory diagram showing a relationship between a starting circuit of FIG. 1 and control means.

FIG. 3 is an explanatory diagram showing a relationship between an engine start period and an open / close state of an on-off valve.

FIG. 4 is an explanatory diagram showing a relationship between an engine start period and an open / close state of an on-off valve.

FIG. 5 is a configuration diagram showing a fuel supply device for a gas engine according to a second embodiment.

FIG. 6 is a configuration diagram showing a fuel supply device for a gas engine according to a third embodiment.

FIG. 7 is a configuration diagram showing a fuel supply device for a gas engine according to a fourth embodiment.

FIG. 8 is a configuration diagram showing a conventional single point injection type compressed natural gas engine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 compressed natural gas engine 5 intake pipe 6 air-fuel mixture generator 7 gas supply pipe 11 oil collecting filter 12 gas regulating valve device 15 connection pipe 16 on-off valve 18 control means (operating means) 31 compressed natural gas engine 33 cylinder 35 intake Pipe 37 gas supply pipe 37D common pipe 38 fuel injection device 42 oil collecting filter 43 connecting pipe 44 on-off valve 45 control means (operating means) 51 thin pipe 52 narrowed portion

Claims (7)

[Claims] An intake pipe of a gas engine using a fuel gas, an air-fuel mixture generating device provided in the middle of the air intake pipe, a gas supply pipe connected to the air-fuel mixture generating device and sending a fuel gas, and the gas A gas regulating valve device that is mounted in the middle of the supply pipe and adjusts the fuel gas to an appropriate amount; and a gas regulating valve device that is mounted in the middle of the gas supply tube and located upstream of the gas regulating valve device and mixed into the fuel gas. An oil collecting filter for collecting oil, a connecting pipe connecting the oil collecting filter and the intake pipe, a normally closed on-off valve mounted in the middle of the connecting pipe, and the on-off valve Operating means for temporarily opening the fuel supply device. 2. An intake pipe for supplying air to each cylinder of a gas engine using a fuel gas, a gas supply pipe for supplying a fuel gas, a common pipe connected to one end of the gas supply pipe, A fuel injection device that is mounted on the common pipe and injects fuel gas into each of the cylinders, and an oil trap that is mounted in the middle of the gas supply pipe and collects oil mixed in the fuel gas. A collecting filter, a connecting pipe connecting the oil collecting filter and the intake pipe, a normally closed on-off valve mounted in the middle of the connecting pipe, and temporarily opening the on-off valve. A fuel supply device for a gas engine, comprising: 3. The control device according to claim 1, wherein the operating device is a control device that opens the on-off valve in an entire area or a part thereof during an engine start period.
A fuel supply device for a gas engine as described in the above. 4. An intake pipe of a gas engine using fuel gas, an air-fuel mixture generation device provided in the middle of the air intake pipe, a gas supply pipe connected to the air-fuel mixture generation device and sending fuel gas, and the gas A gas regulating valve device that is mounted in the middle of the supply pipe and adjusts the fuel gas to an appropriate amount; and a gas regulating valve device that is mounted in the middle of the gas supply tube and located upstream of the gas regulating valve device and mixed into the fuel gas. A fuel supply device for a gas engine, comprising: an oil collecting filter for collecting oil; and a needle-hole-shaped thin tube connecting the oil collecting filter and the intake pipe. 5. An intake pipe for supplying air to each cylinder of a gas engine using fuel gas, a gas supply pipe for supplying fuel gas, a common pipe connected to one end of the gas supply pipe, A fuel injection device that is mounted on the common pipe and injects fuel gas into each of the cylinders, and an oil trap that is mounted in the middle of the gas supply pipe and collects oil mixed in the fuel gas. A fuel supply device for a gas engine, comprising: a collection filter; and a needle-hole-shaped thin tube connecting the oil collection filter and the intake pipe. 6. An intake pipe of a gas engine using a fuel gas, an air-fuel mixture generating device provided in the middle of the air intake pipe, a gas supply pipe connected to the air-fuel mixture generating device and sending fuel gas, and the gas A gas adjusting valve device mounted in the middle of the supply pipe to adjust the fuel gas to an appropriate amount; and an oil mounted in the middle of the gas supply pipe so as to be located above the gas adjusting valve device and mixed in the fuel gas. Fuel for a gas engine, comprising: an oil collecting filter for collecting oil; and a connecting pipe connecting the oil collecting filter and the intake pipe and having a constricted portion provided on an inner wall. Feeding device. 7. An intake pipe for supplying air to each cylinder of a gas engine using a fuel gas, a gas supply pipe for sending a fuel gas, a common pipe connected to one end of the gas supply pipe, A fuel injection device that is mounted on the common pipe and injects fuel gas into each of the cylinders, and an oil trap that is mounted in the middle of the gas supply pipe and collects oil mixed in the fuel gas. A fuel supply device for a gas engine, comprising: a collection filter; and a connection pipe that connects the oil collection filter and the intake pipe and has a constricted portion on an inner wall.