JP3448993B2 - Fuel supply system for gaseous fuel engine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device for a gas fuel engine that operates by a gas fuel such as natural gas.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 62-2439.
As described in Japanese Patent Laid-Open No. 36-36991, boil-off gas generated in a liquefied natural gas storage tank of a liquefied natural gas carrier is used as a fuel and is supplied to an engine by an injection method through the gaseous fuel and a gaseous fuel injection valve. Known is a gas fuel engine. Since natural gas has methane as a main component and produces a small amount of CO ₂ , it is an effective measure against the problem of global warming, and thus has recently been attracting attention as a gasoline alternative fuel for automobile engines and the like.

When the above natural gas is used in an automobile engine, it is filled and stored in a gaseous fuel container such as a fuel cylinder of a predetermined size so that it can be mounted on a vehicle. When the natural gas stored in the gaseous fuel container is injected into the combustion chamber or the intake passage of the engine by the fuel injection valve,
Natural gas is filled and stored in the gaseous fuel container at a high pressure of, for example, 200 kg / cm ² , and is reduced to, for example, about 8 to 4 kg / cm ² by a pressure regulator provided in the fuel supply passage and supplied to the fuel injection valve. A fuel supply system is adopted.

Further, in this case, in order to increase the traveling distance of the automobile, it is inevitably necessary to increase the capacity or the number of the gas fuel containers.

However, when a single container is expanded, the degree of freedom of the loading place is lost, and there is a problem of safety. Therefore, in the above-mentioned gaseous fuel supply device for an automobile engine, the gaseous fuel container has a structure as shown in FIG. As shown in FIG. 6 and FIG. 7, a combination of a plurality of them is used (see, for example, JP-A-2-23259).

In that case, a manual on-off valve (70) and a swirl preventive valve (70) as shown in FIGS. 2 and 3, for example, are provided at the respective gaseous fuel discharge ports of the plural gaseous fuel containers 18a to 18c. 50) is provided with the main valves 30a to 30c, and one of them is used alone, or two of them are used together, and the internal pressure of the gas fuel container is the lower limit of use. When the following occurs, it is considered to open the on-off valve of the main valve of the remaining high pressure side gaseous fuel container and continue to use it.

That is, first, in FIG. 6, first to third gas fuel containers 18a to 18c are arranged side by side, and for example, the first gas fuel container 18a to the second and third gas fuel containers 18b, 1 are arranged.
8c shows a configuration in the case of sequentially switching to 8c for use. In the figure, reference numerals 30a to 30c are first to third having on-off valves and swirl preventive valves provided at the gas fuel discharge ports of the first to third gas fuel containers 18a to 18c.
Source valves 31a to 31c are the first to third source valves 30a.
To 30c through the first to third gas fuel containers 18a.
.About.18c gas fuel discharge passages are joined to one gas fuel supply passage 19 on the engine side, first to third gas fuel discharge passages 41 are provided with check valves 44a to 44c, respectively.
It is a gaseous fuel filling passage for supplying gaseous fuel to the first to third gaseous fuel containers 18a to 18c via the third branch passages 41a and 41c.

In this structure, when the amount of fuel in the first gaseous fuel container 18a becomes less than or equal to the lower limit of use, the main valve 30b of the second gaseous fuel container 18b is subsequently opened and the second gaseous fuel container 18b is opened. The gaseous fuel from the gaseous fuel container 18b is supplied to the engine side gaseous fuel supply passage 19 through the second gaseous fuel discharge passage 31b.

Further, the second gaseous fuel container 18 is further provided.
When the amount of fuel in the container falls below the lower limit of use, the main valve 30c of the third gaseous fuel container 18c is subsequently opened and the gaseous fuel from the third gaseous fuel container 18c releases the third gaseous fuel. It is supplied to the engine-side gaseous fuel supply passage 19 through the passage 31c.

In this way, all the gaseous fuels in the first to third gaseous fuel containers 18a to 18c can be used, and a sufficiently long distance traveling can be realized.

Next, FIG. 7 shows the first similar to the case of FIG.
~ When three third gas fuel containers 18a to 18c are arranged in parallel, while leaving the third gas fuel container 18c,
Main valve 3 of first and second two gaseous fuel containers 18a, 18b
By opening both 0a and 30b, it is possible to run for a considerably long time, and when it is still insufficient, the main valve 30c of the third gaseous fuel container 18c is opened to continuously supply fuel. It is a thing.

Also in the case of this structure, it is possible to use all the gaseous fuels in all the first to third gaseous fuel containers 18a to 18c, and to realize a sufficiently long distance traveling.

[0013]

However, in the case of the configuration shown in FIG. 6, the pressure difference between the first gaseous fuel container 18a and the first gaseous fuel container 18a when the main valve 30b of the second gaseous fuel container 18b is opened is large. If the degree of valve opening is large, the flow rate of the gaseous fuel discharged from the container becomes too large, and the second gaseous fuel container 1
There is a problem that the swirl preventive valve 8b malfunctions and closes, causing an engine stall due to running out of fuel, although the remaining fuel amount is sufficient.

Also in the case of the configuration of FIG. 7, the above-mentioned first,
The same problem occurs when there is a difference in the filling amount of the gaseous fuel between the second gaseous fuel containers 18a and 18b, or when there is a pressure difference during restart or the like.

The present invention has been made for the purpose of solving the above problem, and the flow of the gaseous fuel in the reverse flow direction into the fuel discharge side of the gaseous fuel container upstream of the joining portion of the gaseous fuel supply passage. It is an object of the present invention to provide a fuel supply device for a gas fuel engine, which prevents inflow of fuel due to the operation of the eddy current prevention valve as described above by providing backflow by suppressing inflow. To do.

[0016]

The invention described in each of claims 1 to 4 of the present application is provided with the following effective problem solving means in order to achieve the above object. .

That is, first, the fuel supply apparatus for a gas fuel engine according to the invention of claim 1 of the present application comprises a plurality of gas fuel containers each having a swirl preventive valve provided at the gas fuel discharge portion,
The plurality of gas fuel containers are connected to each other via the vortex prevention valve.
A plurality of fuel discharge passages and a plurality of fuel discharge passages.
Combine the downstream side of the exit passage with one gas fuel supply passage,
Furthermore, install each of the above-mentioned vortex prevention valves on the gas fuel container side.
The fuel pressure on the fuel discharge passage side is a specified value
As mentioned above, it is assumed that the plurality of gases are closed when they are low.
Gaseous fuel stored in the fuel container is passed through the vortex prevention valve.
In the fuel supply device, the fuel gas is supplied to the gas fuel engine through the gas fuel supply means after being circulated in the fuel discharge passage and merged in the one gas fuel supply passage. In the fuel discharge passage between the swirl prevention valve and the gaseous fuel merging portion of the gaseous fuel supply passage,
From the gas fuel supply passage side to the gas fuel container side, respectively
The inflow suppressing means for suppressing the inflow of the gaseous fuel into the air is provided.

Further, in the fuel supply device for a gas fuel engine according to the second aspect of the present invention, the inflow suppressing means having the above structure is
It is composed of a check valve.

Further, in the fuel supply system for a gas fuel engine according to the invention as defined in claim 3, in each of the above-mentioned constitutions,
Natural gas is used as body fuel .

Further, in the fuel supply system for a gas fuel engine according to the fourth aspect, in each of the above constitutions, a plurality of gas fuels are used.
A check valve should be installed between the swirl preventive valve of the container and the inflow control means.
The gas fuel filling port for filling the gas fuel is connected via the above .

[0021]

The invention described in each of claims 1 to 4 of the present application has the following effective operations corresponding to the above-mentioned configurations.

That is, first, in the structure of the fuel supply device for a gas fuel engine according to the first aspect of the present invention, the gas fuel is stored in a plurality of gas fuel containers each of which has a swirl preventive valve provided at its gas fuel discharge portion. the gaseous fuel, a plurality of fuel discharge passage
In the fuel supply device for supplying the gas fuel to the gas fuel engine through the gas fuel supply means after being circulated in the passage and merged in one gas fuel supply passage, the swirl prevention valves of the plurality of gas fuel containers and the gas fuel supply passage Between the gas fuel merging part of
The gaseous fuel supply passages are respectively connected to the plurality of fuel discharge passages.
Since the inflow suppressing means for suppressing the inflow of the gaseous fuel from the road side to the gaseous fuel container side is provided, it is considered that the internal fuel pressure of a certain gaseous fuel container among the plurality of gaseous fuel containers becomes equal to or lower than the lower limit of use. Even if the main valve of the high-pressure side gas fuel container is opened, the gas fuel from the high-pressure side gas fuel container is discharged from the joining portion of the gas fuel passage due to the pressure difference between them.
There is no reverse flow into the low pressure side gas fuel container via the valve, and therefore the vortex flow prevention valve of the high pressure side gas fuel container does not operate and run out of fuel.

Further, in the structure of the fuel supply device for the gas fuel engine according to the invention as defined in claim 2, the inflow suppressing means for suppressing the inflow of the gaseous fuel into the low pressure side gaseous fuel container is specifically constituted by the check valve. It is configured.

Therefore, the check valve can realize a reliable backflow preventing action.

Further, in the structure of the fuel supply device for the gas fuel engine according to the invention of claim 3, in each of the above structures,
Natural gas such as CNG (compressed natural gas) is used as the gaseous fuel.
Gas fuel using the same natural gas
It is possible to effectively obtain the above-mentioned actions in the engine.
It

Further, in the structure of the fuel supply device for the gas fuel engine according to the fourth aspect , the swirls of the plurality of gas fuel containers are provided.
A check valve between the flow prevention valve and the inflow suppression means
A gas fuel filling port for filling the fuel is connected.

Therefore, it is possible to easily fill the gaseous fuel.
Becomes

[0028]

As a result of the above, according to the fuel supply device for a gas fuel engine of the present invention, the reverse flow of the gaseous fuel into the spent low pressure side gaseous fuel container at the start of the switching of the gaseous fuel container or the simultaneous use of the gaseous fuel containers It is possible to prevent the backflow into the low-pressure side gas fuel container due to the occurrence of the pressure difference, and it is possible to reliably avoid the fuel shortage phenomenon due to the operation of the swirl prevention valve .

[0029]

EXAMPLES (real施例) will be described in detail with reference to actual施例of the present invention with reference to the accompanying drawings.

[0030] First, FIG. 1 is a fuel supply system diagram of a fuel supply system for a gaseous fuel engine according to the actual施例of the present invention. In FIG. 1, reference numeral 1 is an engine body of a V-type 6 cylinder engine. The engine body 1 includes a cylinder block 2 forming left and right banks so as to form a V shape, and pistons 3, 3, ... Arranged in each cylinder portion of the left and right banks.
And a cylinder head 4 fixed to the upper part of the cylinder block 2. In addition, the cylinder head 4 has intake pipes 5 and 5 independent of each other so as to rise upward inside the left and right banks.
Are connected to the surge tanks 6A, 6B for each bank.
In addition, the intake passage side passage portion 7 of each surge tank 6A, 6B
Throttle valves 8A and 8B are arranged at A and 7B, respectively. And, these intake air inlet side passage portions 7A, 7B
The upstream side of is connected to one upstream side intake passage 9, and the tip of the upstream side intake passage 9 is further connected to an air cleaner 10. An air flow meter 11 is provided near the connection with the air cleaner 10. In addition, the independent intake pipes 5, 5, ... Of each of the cylinders are located at the connection portion with the cylinder head 4, and the gas fuel injection valves 12, 1
2 ... are installed respectively.

An exhaust manifold 13 is connected to the cylinder head 4 from the outside of the left and right banks, and a catalytic converter 14 is provided at a downstream collecting portion of the exhaust manifold 13.
Are connected. An O ₂ sensor 15 for A / F detection is arranged upstream of the connecting portion of the catalytic converter 14. Further, the cylinder block 2 is provided with a water temperature sensor (not shown) that detects the cooling water temperature of the engine, and further, the intake system is provided with an intake temperature sensor (not shown) that detects the intake temperature of the engine. Has been.

On the other hand, reference numeral 18 denotes a set of three fuel cylinders (gaseous fuel container) 1 to 3 for storing compressed natural gas (CNG) at a high pressure (for example, 200 kg / cm ² ) as described above.
It is a gas fuel storage part provided with 8a, 18b, 18c. Each of the first to third fuel cylinders 18a of the gaseous fuel storage section 18
Nos. 18 to 18c are first to third fuel discharges of a predetermined length, which are connected through first to third main valves 30a to 30c each having an on-off valve and a swirl preventive valve at their gaseous fuel discharge ports. The passages 31a to 31c, and the first to third fuel discharge passages 31
Each of a to 31c is joined to one fuel supply passage 19 on the downstream side of a predetermined position. And, in the middle of the above
Between the third main valves 30a to 30c and the gaseous fuel merging portion, first to third check valves 40a to 40c from the upstream side to the downstream side,
First to third pressure sensors 25a to 25c and first to third cutoff valves 20a to 20c are provided respectively.

The first to third fuel discharge passages 31a are also provided.
To 31c, the first to third main valves 30a to 30c and the first to third
First to third branch filling passages 4 having fourth to sixth check valves 44a to 44c are provided between the third check valves 40a to 40c.
The gas fuel filling passage 41 is connected via 1a to 41c. A manual filling valve 42 and a quick coupling 43 are provided at the end of the gaseous fuel filling passage 41 on the filling port side. Then, the fuel cylinders 18a to 18c of the respective gaseous fuel reservoirs 18 are passed through the gaseous fuel filling passage 41.
Gaseous fuel is filled and stored in.

Further, the above-mentioned first to third check valves 40a to 40a.
Reference numeral 0c is an inflow suppressing means that allows the gaseous fuel discharged through the first to third source valves 30a to 30c to pass through the gaseous fuel supply passage 19 side, but prevents the inflow in the opposite direction. It is supposed to work. Further, the first to third pressure sensors 25a to 25c detect the first to third pressure sensors 25a to 25c from the corresponding gas fuel pressures (pipe pressures) in the first to third fuel discharge passages 31a to 31c.
~ The remaining fuel amount of each of the third fuel cylinders 18a to 18c is detected. In addition, the first to third shutoff valves 20a
˜20c is an engine control unit 2 described later.
6 is a solenoid valve that is controlled to open and close. The engine control unit 26 is opened only when the ignition switch (IGSW) is in the operating state, and is closed when the ignition switch is in the stopped state, and is closed when the engine is stopped. It is designed to prevent fuel leaks.

On the other hand, the first to third fuel discharge passages 31
One fuel supply passage 19 in which a to 31c are merged has a downstream end of 6 in correspondence with the left and right cylinders of the engine body 1.
The gas fuel injection valve 12, 1 of each cylinder is branched into
It is communicated with 2 ... Further, in the one fuel supply passage 19, a pressure switch 24 for determining an empty state, a pressure converter 21 for operating the pressure indicator 21a, and a fourth shutoff valve 32 are provided on the side close to the gaseous fuel storage portion 18. A fuel mixer 27, a low-pressure regulator 22B, and a high-pressure regulator 22A are provided respectively on the front side of the branch position on the side close to the respective gaseous fuel injection valves 12, 12. The pressure converter 21 provided in the gaseous fuel supply passage 19 detects the remaining amount of the gaseous fuel based on the pressure of the gaseous fuel supplied to the gaseous fuel injection valves 12, 12 and displays it on the pressure indicator 21a. To do. Further, the pressure switch 24 is turned on to turn on the empty lamp 21a when the pressure is 30 kgf / cm ² or less.

Although not shown, the gas fuel supply passage 19 is further provided with a gas temperature sensor for detecting the fuel temperature for density correction.

Further, reference numeral 26 is an engine control unit for detecting signals from various sensors (intake air amount a,
Air-fuel ratio b, fuel pressure c, intake air temperature d, gas temperature e, engine water temperature
In addition to f and battery voltage g), an ignition switch signal (h) is input, and a crank angle signal (i) from a crank angle sensor (not shown) and the like are input as information. The gas fuel injection valves 12, 12, ... Are controlled based on the input information, and the first to third cutoff valves 20a to 20c and the fourth cutoff valve 32 are controlled.
Is controlled to be opened and closed as will be described later.

The control of the gaseous fuel injection valves 12, 12 ... Calculates the basic injection amount of fuel based on the engine speed calculated from the crank angle signal of the engine and the intake air amount detected by the air flow meter 11. and, it the water temperature, intake air temperature, various corrections by gas temperature, etc. In addition, also O ₂
The final fuel injection amount is set by adding air-fuel ratio feedback correction based on the output of the sensor 15, and the gas fuel injection valves 12, 1 are set by the fuel injection signal corresponding to the fuel injection amount.
2 is driven.

Basically, the first to third shutoff valves 20a to 20c and the fourth shutoff valve 32 are basically turned on (ON) by an ignition switch signal in order to prevent fuel leakage when the engine is stopped. In conjunction with turning off (OFF), it is controlled to open when the ignition switch is turned on and close when the ignition switch is turned off. However, for the fourth shutoff valve 32, the ignition switch is turned on.
Sometimes the gas fuel injection valve 12, instead of opening immediately,
In order to secure the sealability of the valve seat by rapidly raising the fuel pressure before 12 ...
~ A predetermined period from the opening of the third shutoff valves 20a to 20c
The gas fuel injection valves 12, 12 ... Are controlled to open after a lapse of a period (equivalent to a period until the fuel pressure in front of the gas fuel injection valves 12 and 12 reaches 10 kg / cm ² ).

Further, the on-off valves and the first to third main valves 30a to 30c provided with the vortex flow preventing valve, which are respectively provided on the first to third gaseous fuel discharge ports, are shown in FIGS. 2 and 3, respectively. It is configured as shown in FIG.

That is, first, reference numeral 50 is an eddy current prevention valve, and a valve housing of the eddy current prevention valve 50 has a first communication hole 51a communicating with the gas fuel discharge port side of the fuel cylinders 18a to 18c and an engine. Side first to third fuel discharge passages 31a
A second communication hole 51d that communicates with 31c via the manual opening / closing valve 70 is formed in the orthogonal direction. The first and second communication holes 51a and 51d are communicated with each other through a valve body storage hole 51b and a release rod storage hole 51c.

A sleeve-shaped valve body retainer 52 is fitted and fixed in the first communication hole 51a on the lower side, and a valve receiving member 53 is provided on an upper portion thereof and a flange is provided on an outer periphery of a bottom portion thereof. It is supported through the section.

The valve receiving member 53 has a valve body fitting portion 53b for fitting and supporting the lower end side fitting convex portion 54a of the valve body 54 in the central portion, and a cylindrical standing edge portion 53c on the outer periphery thereof. Then
A fuel passage 53a, which communicates with the fuel supply passage 57 inside the valve body retainer 52, between the upright edge portion 53c and the valve body fitting portion 53b.
Are formed. The valve receiving member 53 is constantly pressed downward by the spring 55 with a predetermined urging pressure, and in the steady state, the valve body 54 is lowered as shown in FIG.

On the other hand, the valve body 54 is formed in a columnar structure having a large-diameter valve portion 54b on the upper end side thereof and the fitting convex portion 54a for the valve receiving member 53 on the lower end side as described above. It is loosely fitted in the valve body storage hole 51b. A lower end 56a of a release rod 56, which is pressed downward from the upper side by a manual operation member 60, is fitted to the center of the valve portion 54b of the valve body 54.

The release rod 56 has a fuel passage and is loosely fitted in the release rod housing hole 51c. And, the bottom rod side outer peripheral surface of the release rod storage hole 51c is
It is formed on the valve seat surface of the valve portion 54b of the valve body 54.

Further, the on-off valve 70 has the second communication hole 51d and the first to third gaseous fuel discharge passages 31a to 31c.
It is installed between and and can be opened and closed manually.

Therefore, in this configuration, the pressure in the second communication hole 51d, which is a connection passage to the engine side gaseous fuel discharge passages 31a to 31c, and the first to third fuel cylinders 18a to 18c side. In a steady state where the pressure difference from the fuel supply passage 57 side pressure in the valve retainer 52, which is a connection passage, is smaller than a predetermined pressure difference and is not in a vortex state, the valve body 54 is urged by the spring 55 as shown in FIG. Since it is descending, the gas fuel from any one of the first to third fuel cylinders 18a to 18c, or any two of them is indicated by an arrow, and the fuel supply path 57, 1 to 3 corresponding fuel release passages 3 from the manual open / close valve 70 in the open state through the fuel passages of each part of the
It is released to any one or two of 1a to 31c.

However, when a pressure difference of a predetermined value or more occurs between the two portions due to the first to third gaseous fuel discharge passages 31a to 31c being opened to the atmosphere, the valve body 54
Due to the high pressure on the upstream side of the section, a swirl state is generated, the valve body 54 rises against the biasing force of the spring 55 as shown in FIG. 3, and the valve section 54b abuts on the valve seat side. The subsequent release of gaseous fuel is blocked. This prevents the eddy current condition. The release of the eddy current prevention state is performed by pushing the release rod 56 downward by the pressing operation member 60 and lowering the valve body 54 to the state of FIG.

By the way, conventionally, since the vortex flow prevention valve 50 operates as described above, there is a problem as already shown in FIGS. 6 and 7.

However, in the configuration of the present embodiment, as described above, the first to third fuel discharge passages 31a to 31c have the upstream ends of the single gaseous fuel supply passages, which are the gaseous fuel merging portions, respectively. First to third check valves 40a to 40c are provided on the upstream side with respect to each other. Each of the check valves 40a to 40c allows passage of fuel in the engine-side fuel discharge direction but does not pass in the opposite direction. ing.

Therefore, as shown in FIG. 6, even if the fuel internal pressure of a certain fuel cylinder 18a among the plurality of fuel cylinders 18a to 18c becomes lower than the lower limit of use, the main valve 30b of the other high pressure side fuel cylinder 18b is turned on. Even if it is opened, or even if there is a pressure difference between the two fuel cylinders 18a and 18b as shown in FIG. 7, the gas fuel from the high-pressure side gas fuel cylinder is caused by the pressure difference between the respective fuel cylinders. Backflow into the low-pressure side gas fuel cylinder will not occur, and the vortex prevention valve 50 of the high-pressure side gas fuel cylinder will not malfunction to cause fuel shortage.

The fourth shut-off valve 3 in the above embodiment
Reference numeral 2 is for more reliably preventing fuel leakage when not operating for a long time, but the shutoff valve 32 may also be constructed of a manual type.

Reference Example Next, FIGS. 4 and 5 show a fuel supply device for a gas fuel engine according to a reference example of the present invention.

In the configuration of this reference example, as shown in FIG.
In the configuration of the gas fuel supply device configured as you施例, opening the valve opening area, such as the first to third check valve for example delay valve instead 40a~40c gradually increased from the time of opening It is characterized in that damper valves (damper means) 35a to 35c having characteristics (see FIG. 5) are provided.

According to this structure, as shown in FIG. 5, in each case of FIGS. 6 and 7, the first to third main valves 30a to 30a ...
Of the 30c, the first or first and second main valves 30a, 30a
Even manual on-off valve 70 and 30b is opened, never as the gas fuel discharge amount increases abruptly, because so suppressed below operation flow level of vortex flow valve 50, also on SL as with the actual施例vortex valve 5
It becomes possible to avoid running out of fuel due to a malfunction of 0. Further, it is not necessary to cause a sudden change in the engine air-fuel ratio.

In each of the above embodiments, a gas fuel injection valve, for example, is used as the gas fuel supply means to the engine, but this may be a mixer type such as a carburetor for a gasoline engine. Needless to say.

[Brief description of drawings]

FIG. 1 is a fuel supply system diagram of a fuel supply system for a gaseous fuel engine according to the actual施例of the present invention.

FIG. 2 is a cross-sectional view showing a structure of an original valve with an eddy current prevention valve of the fuel supply device in a non-operating state.

FIG. 3 is a cross-sectional view of an operating state of the original valve with the same eddy current prevention valve.

FIG. 4 is a fuel supply system diagram of a fuel supply device of a gas fuel engine according to a reference example.

FIG. 5 is an operational characteristic diagram illustrating the operation of the reference fuel supply device.

FIG. 6 is an explanatory diagram illustrating a first problem of a fuel supply device for a conventional gas fuel engine.

FIG. 7 is an explanatory diagram illustrating the second problem.

[Explanation of symbols]

1 is an engine body, 2 is a cylinder block, 4 is a cylinder head, 12 is a gaseous fuel injection valve, 18 is a gaseous fuel reservoir, 18a-18c are first to third fuel cylinders, 19 is a fuel supply passage, and 20a- 20c is a first to third shutoff valve, 32
Is a fourth shutoff valve, 21 is a pressure converter, 25 is an engine control unit, 31a to 31c are swirl preventive valve original valves, and 35a to 35c are damper valves.

Claims (4)

(57) [Claims] 1. A plurality of gaseous fuel containers, each of which has a swirl preventive valve provided in a gaseous fuel discharge part, wherein each of the plurality of gaseous fuel containers is provided through the swirl preventive valve.
A plurality of fuel discharge passages connected to the plurality of fuel discharge passages.
The downstream side of the discharge passage merges with one gas fuel supply passage.
Each of the above-mentioned swirl preventive valves is connected to the fuel pressure on the gas fuel container side.
The fuel pressure on the fuel discharge passage side is lower than the specified value
Is intended to closed to Itoki, a gaseous fuel stored in the plurality of gas fuel container, the
A plurality of gaseous fuel containers, wherein the plurality of gaseous fuel containers are supplied to the gaseous fuel engine through the gaseous fuel supply means after being circulated to the fuel discharge passage through the swirl prevention valve and merged in the one gaseous fuel supply passage. of the fuel discharge passage between said swirl valve and the gas fuel merging portion of the gaseous fuel supply passage, it
A fuel supply device for a gas fuel engine, characterized by comprising inflow suppressing means for suppressing the inflow of gas fuel from the gas fuel supply passage side to the gas fuel container side . 2. The fuel supply device for a gas fuel engine according to claim 1, wherein the inflow suppressing means is a check valve. 3. The gas fuel is natural gas,
The fuel supply device for a gas fuel engine according to claim 1 or 2 . 4. A swirl preventive valve and inflow of a plurality of gaseous fuel containers
A gas filled with gaseous fuel is inserted between the suppression means via a check valve.
The body fuel filling port is connected.
1. A fuel supply device for a gas fuel engine according to 1, 2, or 3 .