JPH09229298A - Gas supplying device and gas traveling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve a problem of causing errors in the flow rate of gas to be exhausted from a three-way valve by the depressurizing operation after filling gas. SOLUTION: A gas filling connecting coupler 34 of a dispenser unit 5 is connected to a fuel tank side connecting coupler 42 of a gas traveling vehicle 2, and a gas recovering connecting coupler 36 provided on the end of a gas recovering hose 35 of a three-way valve 32 is connected to a low-pressure side connecting coupler 50 of the gas traveling vehicle 2. When gas filling is finished, a manual opening and closing valve 43 is closed, and then a discharging port (b) of the three-way valve 32 and an exhaust port (c) are communicated with each other. Therefore, gas remaining between the three-way valve 32 and the manual opening and closing valve 43 is introduced into a low-pressure tank 52 of the gas traveling vehicle 2 through the gas recovering hose 35 and the connecting couplers 36, 50. Therefore, pressure inside the connecting couplers 34, 42 is reduced, and the gas filling connecting coupler 34 can be easily removed from the fuel tank side connecting coupler 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas supply device and a gas traveling vehicle configured to recover the residual gas between the gas filling hose and the gas filling connection portion of the fuel tank after filling the fuel tank with the gas. Regarding

[0002]

2. Description of the Related Art For example, as a gas supply device for supplying compressed natural gas (CNG) obtained by compressing natural gas to another tank, there is a device as disclosed in Japanese Utility Model Laid-Open No. 4-64699. The device of this publication adopts a method of rapidly filling compressed gas, and temporarily stores the gas whose pressure has been raised above a predetermined pressure by a compressor in a gas supply tank (gas accumulator) and then supplies the gas. The gas stored in the tank is injected into a fuel tank of a gas traveling vehicle to fill the inside of the fuel tank until a predetermined pressure is reached.

The amount of gas supplied to the fuel tank of a gas traveling vehicle is measured by a flow meter, the total flow rate filled in the fuel tank can be known, and the pressure filled in the fuel tank can be detected by the pressure gauge. . Further, a connecting coupler (for example, made of a quick coupler) as a gas filling connecting portion connected to the fuel tank side connecting portion is provided at the tip of the hose drawn out from the apparatus main body. This connection coupler is connected to the fuel tank side connection portion of the gas traveling vehicle before gas supply, and is disconnected from the fuel tank side connection portion after gas filling is completed.

However, if the pressure in the hose is high, the connecting coupler cannot be removed from the fuel tank side connecting portion. Therefore, when the connecting coupler is removed from the fuel tank after completion of gas filling, the operator manually operates. The gas in the connection coupler and the connection portion on the fuel tank side was discharged to the outside by switching the three-way valve.

[0005]

However, conventionally, in order to disconnect the connecting coupler from the fuel tank side connecting portion, the three-way valve is switched after the completion of gas filling to reduce the pressure inside the connecting coupler and the connecting portion to atmospheric pressure. When the gas in the connecting coupler and the connecting portion is discharged into the atmosphere, not only the gas is wasted but also the air may be polluted.

Further, it is considered that after the gas filling is completed, the three-way valve is switched to collect the gas in the connection coupler and the connection portion in the recovery container. In this case, since the gas is recovered, the above problem is solved, but there is a problem that the gas supply amount supplied to the fuel tank does not match the flow rate measurement value measured by the flow meter.

That is, the filling amount of the gas filled in the fuel tank is the flow rate obtained by subtracting the flow rate remaining between the three-way valve and the opening / closing valve of the fuel tank from the integrated flow rate measured by the flow meter and integrated. Is. Therefore, there is a problem in that the flow rate indicator shows a large amount of the flow rate remaining between the three-way valve and the on-off valve of the fuel tank, and does not match the filling amount of the gas filled in the fuel tank.

Therefore, an object of the present invention is to provide a gas supply device and a gas traveling vehicle that solve the above problems.

[0009]

In order to solve the above problems, the present invention has the following features. Claim 1
According to the invention, a gas filling connection portion connected to a fuel tank side connection portion of a gas traveling vehicle that uses compressed gas as fuel, and a gas filling connection portion that is provided so as to communicate with the gas filling connection portion are compressed when gas is filled. Gas is supplied to the fuel tank, and after the gas filling is completed, the gas in the gas filling connecting portion is exhausted to the outside to reduce the pressure in the gas filling connecting portion. The exhaust port of the valve is connected to a gas recovery system path branched from a fuel supply system path for supplying gas from the fuel tank of the gas traveling vehicle to the engine, and after the gas filling of the fuel tank is completed, the three-way valve is switched. It is characterized in that the gas in the pipeline that connects the three-way valve and the fuel tank is supplied to the fuel supply system passage through the gas recovery system passage.

Therefore, according to the first aspect of the present invention, after the gas has been filled in the fuel tank, the gas in the pipeline connecting the three-way valve and the fuel tank is switched through the gas recovery system path by switching the three-way valve. Since it can be supplied to the fuel supply line of a gas traveling vehicle, it is less wasteful than when the recovered gas is discharged into the atmosphere, and the amount of gas supplied to the gas traveling vehicle and the measured flow rate measurement value. Can be matched with.

Further, according to the invention of claim 2, the fuel tank side connecting portion communicated with the discharge port of the three-way valve provided in the gas supply system passage of the gas supply device, and the compression via the fuel tank side connecting portion. A fuel tank filled with the stored gas and a fuel supply system path for supplying gas from the fuel tank to the engine, and using the gas in the fuel tank as fuel, the exhaust of the three-way valve A gas recovery side connecting portion, which is connected to the port and to which the gas recovered by switching the three-way valve is supplied, has one end branched from the fuel supply system passage and the other end connected to the gas recovery side connecting portion. A gas recovery system path is provided, and after the gas is filled in the fuel tank, the gas in the pipeline communicating the three-way valve and the fuel tank is recovered to the fuel supply system path via the gas recovery system path. Characterized by being Than it is.

Therefore, according to the second aspect of the present invention, after the gas is filled in the fuel tank, the gas in the pipe line connecting the three-way valve and the fuel tank is supplied to the fuel of the gas traveling vehicle through the gas recovery system line. Since the collected gas is collected in the supply system path, it is less wasteful than the case where the collected gas is discharged into the atmosphere, and the gas supply amount supplied to the gas traveling vehicle and the measured flow rate measurement value can be matched. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 shows an embodiment of the gas supply device and the gas traveling vehicle according to the present invention. The gas supply device 1 is installed, for example, in a gas supply station that supplies compressed natural gas (CNG) obtained by compressing city gas to a predetermined pressure to a fuel tank 3 of a gas traveling vehicle 2.

The gas supply device 1 generally supplies a pressure generating unit 4 for compressing city gas to a predetermined pressure to generate a pressurized gas, and a gas compressed by the pressure generating unit 4 to the fuel tank 3. The dispenser unit 5 of FIG. The pressure generation unit 4 has a configuration in which a branch line 11 branched from a medium pressure line of city gas is connected to a compressor 12. This compressor 12 has, for example, a plurality of cylinders (3 or 4) for compressing gas.
The gas compressed by the cylinder of the previous stage is pressurized to a higher pressure by the cylinder of the next stage and the gas supplied from the branch pipe line 11 is compressed stepwise.

Further, a pressure switch 14 for detecting the pressure discharged from the compressor 12, and a compressor 12 are provided in the high-pressure pipeline 13 drawn from the compressor 12.
A check valve 15 is provided to prevent the backflow of the gas generated by. Further, an end portion of the branch pipe 16 branched from the high pressure line 13, a plurality of gas accumulator 17 (17 ₁ to
17 _n ) are connected. The gas accumulator 17 is also generally referred to as "gas accumulator" in the literature and the like.

[0016] The gas accumulator 17 (17 ₁ ~17 _n) is high-pressure gas compressed by the compressor 12,
In this embodiment, the gas compressed to 250 kgf / cm ² is accumulated. The pressure switch 14 includes a gas accumulator 17 (17
_The pressure accumulated in _{1 to} 17 _n ) is the specified pressure 250 kgf / cm
^When it reaches ² , the detected signal is sent to the compressor control panel 18
Output to Compressor 12 is controlled by the compressor control panel 18, a gas accumulator 17 (17 ₁ to
17 _n ) reaches the specified pressure of 250 kgf / cm ² , the load operation is switched to the unload operation.

At the downstream end of the high pressure line 13, a first opening / closing valve 19 made of an electromagnetic valve is provided. The first on-off valve 19 is closed when the gas compressed by the compressor 12 is supplied to the gas pressure accumulator 17, and prevents the gas from flowing out to the dispenser unit 5,
The valve is opened when the gas in the gas pressure accumulator 17 is filled in the fuel tank 3. When the pressure in the gas pressure accumulator 17 reaches the specified pressure of 250 kgf / cm ² , the pressure generation unit 4
Is in a standby state ready for filling work.

The pressure generating unit 4 and the dispenser unit 5 are connected to each other via a gas supply line 21. The gas supply pipeline 22 connected to the downstream end of the gas supply pipeline 21 and extending into the dispenser unit 5 is provided with a second opening / closing valve 23 composed of an electromagnetic valve and a gas supply pipeline 22. Flow meter 24 for measuring the flow rate of flowing gas
A control valve 25 for controlling the pressure or flow rate fed to the downstream side to a predetermined value, a secondary pressure transmitter 26 for detecting the secondary pressure supplied downstream of the control valve 25, and An overfilling prevention valve 27 that prevents the next pressure from exceeding a specified pressure (200 kgf / cm ^{2 in} this embodiment) and an emergency disconnect coupler 28 that separates when pulled by a predetermined force or more are provided. ing.

As the flow meter 24, a Coriolis mass flow meter capable of accurately measuring the flow rate of high-pressure gas is adopted, and the flow rate measurement signal is output. Then, the valve opening of the control valve 25 is adjusted by a constant pressure increase control that fills the gas with a constant pressure increase or a constant flow rate control that fills the gas with a constant flow rate as described later.

The overfilling prevention valve 27 has the pressure in the gas supply line 22 introduced as a pilot pressure, and operates so as to reduce the valve opening when the pressure in the gas supply line 22 exceeds 200 kgf / cm ^2. To do. The emergency disengagement coupler 28 is provided in the emergency disengagement coupler 28 when the gas traveling vehicle 2 departs while the connection coupler 34 is still connected to the fuel tank side connection coupler (fuel tank side connection portion) 42. A check valve (not shown) is closed to prevent gas leakage.

A control circuit 29 controls the opening / closing operations of the first opening / closing valve 19 and the second opening / closing valve 23, as will be described later, and controls the flow rate detected by the flow meter 24 and the secondary pressure transmitter 26. Based on the pressure, the valve opening degree of the control valve 25 is controlled by a constant pressure increase control for filling the gas with a constant pressure increase or a constant flow rate control for filling the gas with a constant flow rate.

Further, the control circuit 29 has a flow rate integration counter (flow rate integration section) 29a for integrating the flow rate measurement values measured by the flow meter 24. This flow rate integration counter 29
In a, the manual open / close valve 43 of the gas traveling vehicle 2 is opened to start gas supply to the fuel tank 3 and the flow meter 2
The flow rate pulse output from 4 is integrated to integrate the flow rate supplied to the fuel tank 3.

Reference numeral 30 denotes a display, which displays the filling amount (flow rate integrated value) and filling pressure (secondary pressure) of the gas filled in the fuel tank 3. Further, one end of a gas filling hose 31 capable of withstanding high-pressure gas is connected to the emergency disconnecting coupler 28,
At the other end of the gas filling hose 31, a three-way valve 32 that constitutes a gas filling nozzle is provided. The gas filling hose 31 is connected to the inflow port a of the three-way valve 32. Further, a nozzle portion 33 is connected to the discharge port b of the three-way valve 32, and a gas filling connection coupler (gas filling connection portion) 34 is provided at an end portion of the nozzle portion 33.

Further, the exhaust port c of the three-way valve 32 is provided between the three-way valve 32 and the manual opening / closing valve 43 of the gas traveling vehicle 2 so that the connecting coupler 34 for gas filling can be detached after the gas filling is completed. A gas recovery hose 35 for recovering the remaining gas is connected. At the tip of the gas recovery hose 35, a gas recovery connection coupler (gas recovery connection) 36
Is provided.

The three-way valve 32 provided in this way has a structure that can be switched by manual operation.
The inflow port a and the discharge port b are communicated with each other and the exhaust port c is switched so as to be blocked. Then, before and after the gas filling, the discharge port b and the exhaust port c are in communication with each other and the inflow port a is blocked.

Next, the structure of the gas traveling vehicle 2 that uses compressed gas as fuel will be described. Gas traveling vehicle 2
Is provided with a gas filling conduit 41 for filling the fuel tank 3 with gas. This gas filling line 41
Is provided with a fuel tank side connecting coupler (fuel tank side connecting portion) 42 at its upstream end and its downstream end is at the fuel tank 3
Is communicated to. A manual opening / closing valve 43 and a check valve 44 are arranged between the connecting coupler 42 and the fuel tank 3.

Reference numeral 45 denotes a fuel supply pipe, the upstream end of which communicates with the fuel tank 3 and the downstream end of which is connected to the fuel injection device 46 of the engine (not shown) of the gas traveling vehicle 2. A check valve 47 and a pressure reducing valve 48 are arranged in the fuel supply line 45. Therefore, when the engine of the gas traveling vehicle 2 is started, the gas filled in the fuel tank 3 passes through the fuel supply pipe 45 and is supplied to the fuel injection device 46. At this time, the gas from the fuel tank 3 is depressurized to a predetermined pressure suitable for fuel injection by the pressure reducing valve 48 and supplied to the fuel injection device 46.

Reference numeral 49 is a depressurized gas recovery pipe line for recovering gas at the time of depressurizing operation, and a gas recovery side connection coupler (gas recovery side connection part) 50 for recovery is provided at the upstream end and the downstream side. The side end is communicated with the fuel supply line 45. In addition, the check valve 51 and the low pressure tank 5 are provided in the depressurized gas recovery pipeline 49.
2 are provided. Since the downstream side of the low pressure tank 52 is communicated with the fuel supply pipe line 45 whose pressure is reduced by the pressure reducing valve 48, the pressure of the low pressure tank 52 is considerably lower than the pressure of the fuel tank 3.

Therefore, when the three-way valve 32 is switched and the discharge port b and the exhaust port c are communicated with each other after the gas filling is completed, the gas remaining between the three-way valve 32 and the manual on-off valve 43 is collected in the gas recovery hose. It is introduced into the depressurized gas recovery pipeline 49 via 35 and guided to the low pressure tank 52. When the gas remaining downstream of the three-way valve 32 is recovered in the low pressure tank 52 in this way, the internal pressure of the connecting couplers 34, 42 is reduced to substantially atmospheric pressure, and the connecting couplers 34, 42 are thus reduced.
Can be separated.

Here, a gas filling operation in the gas supply device 1 having the above-mentioned structure will be described. When filling the fuel tank 3 of the gas traveling vehicle 2 with gas, an operator firstly connects the gas filling connection coupler 3 of the dispenser unit 5.
4 is connected to the fuel tank side connection coupler 42 of the gas traveling vehicle 2. Then, the gas recovery connection coupler 36 provided at the end of the gas recovery hose 35 of the three-way valve 32 is coupled to the gas recovery side connection coupler 50 of the gas traveling vehicle 2.

Then, after switching the inflow port a and the filling port b of the three-way valve 32 so that they communicate with each other, when the filling start button (not shown) is turned on, the control circuit 29 causes the first and second control circuits 29 to operate. The second on-off valves 19 and 23 are opened. Next, after the gas is supplied to the manual open / close valve 43 of the gas traveling vehicle 2, the operator opens the manual open / close valve 43 to supply the gas to the fuel tank 3.

As a result, the high-pressure gas accumulated in the gas accumulator 17 is supplied to the gas supply pipe lines 21, 22, the gas filling hose 31, the nozzle portion 33, the connecting couplers 34, 42, and the pipe line 41.
To the fuel tank 3 via the Immediately after the start of filling,
The valve opening degree of the control valve 25 arranged in the gas supply line 22 is slightly narrowed, and the pressure applied to each device by the gas from the gas pressure accumulator 17 is relaxed to protect each device from high-pressure gas. Then, after a lapse of a predetermined time (for example, about 5 seconds), the valve opening degree of the control valve 25 is gradually opened to increase the gas filling flow rate.

When the gas filling into the fuel tank 3 is completed,
The operator performs depressurizing operation. That is, the manual on-off valve 43
After the valve is closed, the discharge port b and the exhaust port c of the three-way valve 32 are made to communicate with each other and the inflow port a is shut off.
As described above, the low pressure tank 52 is the depressurized gas recovery pipeline 4
Since it is communicated with the fuel supply line 45 via 9, the pressure is set to be considerably lower than the pressure of the fuel tank 3. Therefore, the gas that remains between the three-way valve 32 and the manual on-off valve 43 is gas recovery hose 35, connection coupler 36,
It is introduced into the low-pressure tank 52 of the gas traveling vehicle 2 via 50.

Thus, the depressurizing operation is completed. As a result, the internal pressure of the connecting couplers 34 and 42 is reduced, and the gas filling connecting coupler 34 can be easily removed from the fuel tank side connecting coupler 42. Next, the gas filling control process executed by the control circuit 29 will be described. 2 is a flowchart of the gas filling control process executed by the control circuit 29.

As described above, the operator connects the gas filling connection coupler 34 of the dispenser unit 5 to the fuel tank side connection coupler 42 of the gas traveling vehicle 2 and connects the gas recovery connection coupler 36 to the gas traveling vehicle 2 gas. Collection side connection coupler 5
Bind to 0. Then, after switching the inflow port a of the three-way valve 32 and the filling port b so as to communicate with each other, when a filling start button (not shown) is turned on, the control circuit 29
Executes the processing shown in FIG.

When the filling start button is turned on in step S1 (hereinafter "step" is omitted), S2 is entered.
Then, the flow rate display on the display 30 is set to zero. Then S
3, the flow rate integration counter 29a is reset. In next S4, the first and second opening / closing valves 19 and 23 are opened. With this, the pressure of the gas pressure accumulator 17 is supplied to the manual opening / closing valve 43 of the gas traveling vehicle 2. Here, when the operator opens the manual opening / closing valve 43, the gas supplied from the gas pressure accumulator 17 starts to be filled in the fuel tank 3 of the gas traveling vehicle 2.

In step S5, the secondary pressure detected by the secondary pressure transmitter 26 and the flow rate measurement value measured by the flow meter 24 are read. Subsequently, in S6, the flow rate integration counter 29a integrates the flow rate measurement values output from the flow meter 24, and the display unit 30 displays the flow rate integration value accumulated in the flow rate integration counter 29a.

In S7, the valve opening of the control valve 25 is controlled based on the flow rate and pressure read in S5. That is, the valve opening of the control valve 25 is controlled by "constant pressure control" for controlling the pressure to a constant rate of increase or "constant flow rate control" for controlling the flow rate to be constant.

Next, in S8, the secondary pressure transmitter 26
The secondary pressure detected by the target pressure (200kgf / c
m ² ) is reached. Therefore, when the detected value of the secondary pressure transmitter 26 is less than the target pressure (200 kgf / cm ² ), it is determined that the fuel tank 3 is not full, and the process returns to S5. Then, the processing of S5 to S8 is repeated.

However, when the detected value of the secondary pressure transmitter 26 has reached the target pressure (200 kgf / cm ² ), the routine proceeds to S9, where the gas flow rate supplied to the fuel tank 3 is less than the predetermined minute flow rate Qa. It is determined whether or not it has decreased. If S9
When the gas flow rate is equal to or higher than the predetermined minute flow rate Qa, it is determined that the fuel tank 3 is not full yet, the process returns to S5, and the processes of S5 to S9 are repeated. And
When the gas flow rate is reduced to less than the minute flow rate Qa, it is determined that the fuel tank 3 is full, and the process proceeds to S10,
Close all valves. This completes a series of gas filling control.

After the gas filling is completed, the operator operates the manual on-off valve 4
3 is closed, the filling port b of the three-way valve 32 and the exhaust port c are communicated with each other, and the gas remaining between the three-way valve 32 and the manual opening / closing valve 43 is recovered in the low-pressure tank 52 and the connection coupler 34, The pressure inside 42 is reduced. Then, the worker separates the gas filling connection coupler 34 of the dispenser unit 5 from the fuel tank side connection coupler 42 of the gas traveling vehicle 2 and the gas recovery connection coupler 36 from the gas recovery side connection coupler 50. This completes the gas filling operation.

Thus, after the gas filling is completed, the three-way valve 32
The gas remaining between the three-way valve 32 and the manual on-off valve 43 due to the depressurizing operation of the
Since it is collected in the low-pressure tank 52 of the gas traveling vehicle 2 via 6, 50, there is less waste than when the collected gas is discharged into the atmosphere, and the gas supplied to the fuel tank 3 of the gas traveling vehicle 2 The supply amount and the flow rate measurement value measured by the flow meter 24 can be matched. Moreover, the low-pressure tank 52 is connected to the fuel supply line 45 via the depressurized gas recovery line 49.
The gas recovered in the low-pressure tank 52 is supplied to the fuel injection device 46 and used as fuel.

Therefore, the gas filling accuracy can be further improved as compared with the conventional device, and even if the depressurizing operation is performed after the completion of the gas filling, the depressurized gas amount is recovered in the low pressure tank 52, so that the integrated flow rate is obtained. The counter 29a can integrate the flow rates of the gas supplied to the fuel tank 3 and the low pressure tank 52. Therefore, the filling amount filled in the gas traveling vehicle 2 can be displayed on the display device 30.

In the above embodiment, the case where the compressed natural gas (CNG) obtained by compressing the city gas is supplied is given as an example, but the present invention is not limited to this, and gas such as butane and propane may be supplied. Of course, it can be applied. Also,
In the above embodiment, the low pressure tank 5 is provided in the depressurized gas recovery pipe line 49.
2 is provided, but the depressurized gas recovery pipeline 49 is not limited to this.
If the total length of the pipe is long and the volume in the pipeline is sufficient for the amount of gas recovered by the depressurizing operation, the low pressure tank 52
Need not be provided.

[0045]

As described above, according to the first aspect of the present invention,
After filling the fuel tank with gas, switching the three-way valve allows the gas in the pipeline that connects the three-way valve and the fuel tank to be supplied to the fuel supply system path of the gas traveling vehicle through the gas recovery system path. Therefore, there is less waste than when the collected gas is discharged into the atmosphere, and the gas supply amount supplied to the gas traveling vehicle and the measured flow rate measurement value can be matched. Therefore, when filling the fuel tank of the gas traveling vehicle with gas, the gas filling accuracy can be further improved.

According to the second aspect of the present invention, after the gas is filled in the fuel tank, the gas in the pipe line connecting the three-way valve and the fuel tank is supplied to the fuel of the gas traveling vehicle through the gas recovery system line. Since the collected gas is collected in the supply system path, it is less wasteful than the case where the collected gas is discharged into the atmosphere, and the gas supply amount supplied to the gas traveling vehicle and the measured flow rate measurement value can be matched. . Therefore, when filling the fuel tank of the gas traveling vehicle with gas, the gas filling accuracy can be further improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a flowchart of a gas filling control process executed by a control circuit.

[Explanation of symbols]

 1 Gas Supply Device 2 Gas Travel Vehicle 3 Fuel Tank 4 Pressure Generation Unit 5 Dispenser Unit 12 Compressor 17 Gas Accumulator 24 Flow Meter 25 Control Valve 26 Secondary Pressure Transmitter 29 Control Circuit 30 Indicator 32 Three-way Valve 34 Gas Filling Connection Coupler 35 Gas recovery hose 36 Gas recovery connection coupler 42 Fuel tank side connection coupler 43 Manual on-off valve 50 Gas recovery side connection coupler 52 Low pressure tank

Claims (2)

[Claims] 1. A gas filling connection part connected to a fuel tank side connection part of a gas traveling vehicle that uses compressed gas as a fuel, and a gas filling compression part provided so as to communicate with the gas filling connection part. In the gas supply device having a three-way valve for supplying the supplied gas to the fuel tank, exhausting the gas in the gas filling connection portion to the outside after completing the gas filling, and reducing the pressure in the gas filling connection portion, The exhaust port of the three-way valve is connected to a gas recovery system passage branched from a fuel supply system passage for supplying gas from the fuel tank of the gas traveling vehicle to the engine, and after the gas filling in the fuel tank is completed, the three-way valve is switched. The gas supply device is characterized in that the gas in the pipeline communicating with the three-way valve and the fuel tank is supplied to the fuel supply system path via the gas recovery system path. 2. A fuel tank-side connecting portion communicating with a discharge port of a three-way valve provided in a gas supply system passage of a gas supply device, and a gas compressed through the fuel tank-side connecting portion. In a gas traveling vehicle having a fuel tank and a fuel supply system passage for supplying gas from the fuel tank to an engine, the gas traveling vehicle using the gas in the fuel tank as fuel, the three-way valve being connected to an exhaust port of the three-way valve. A gas recovery side connecting portion to which the gas recovered by switching the valve is supplied, and a gas recovery system passage having one end branched from the fuel supply system passage and the other end communicating with the gas recovery side connecting portion. After the gas filling of the fuel tank is completed, the gas in the conduit communicating the three-way valve and the fuel tank is recovered to the fuel supply system path via the gas recovery system path. Gas traveling vehicle.