JPH08100889A - Gas supply device - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a gas supply configured to reduce the pressure of a gas supply line by turning off a power switch so that high pressure does not act on the gas supply line and each device when not operating. The purpose is to provide a device. The gas supply device 1 includes a pressure generation unit 4 that raises city gas to a predetermined pressure, and a dispenser unit 5 that supplies the gas compressed by the pressure generation unit 4 to the fuel tank 3. The control device 6 opens the recovery valve 43 so that the residual pressure of the gas supply pipeline 19 is released to the low pressure pipeline 42 by turning off the power switch 39, and reduces the pressure of the gas supply pipeline 19 to reduce the pressure of the gas supply pipeline. Road 19
And make sure that each device is not under pressure. Further, when the power switch 39 is turned on, the gas supply opening / closing valve 20 is opened so as to supply the pressure to the gas supply pipeline 19, so that the next gas filling operation can be performed quickly.

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 more particularly to a gas supply device configured to fill a tank to be filled with compressed gas.

[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 the said gazette adopts a method of rapidly filling compressed gas, and a gas whose pressure has been raised to a predetermined pressure or higher by a compressor is once stored in a gas supply tank and then stored in the gas supply tank. Gas is supplied to a fuel tank (filled tank) of an automobile to fill the inside of the fuel tank until a predetermined pressure is reached.

The amount of gas supplied to the fuel tank of an automobile is measured by a flow meter provided in the gas supply line, and the filling pressure of the fuel tank can be detected by a pressure transmitter which outputs a signal according to the pressure. . Further, at the tip of the gas filled hose pulled out from the main body of the apparatus, a connecting member (for example, made of a quick coupler) connected to a connecting portion (for example, made of a quick coupler) of the fuel tank is provided. The connecting member is connected to the fuel tank of the automobile before the gas is supplied, and is removed from the fuel tank after the gas filling is completed.

However, if the pressure inside the connecting member is high, the connecting member cannot be removed from the connecting portion of the fuel tank. Therefore, when the connecting member is removed from the fuel tank after the completion of gas filling, the operator must remove the gas. The manual three-way valve provided in the filling hose is switched to collect the residual gas in the connection member in the low-pressure tank to reduce the pressure in the connection member to atmospheric pressure. Then, before switching the three-way valve, the worker closes the on-off valve provided at the connection portion of the fuel tank in order to prevent the gas filled in the fuel tank from flowing out to the low pressure tank.

Therefore, the operator confirms that the on-off valve provided at the connecting portion of the fuel tank is closed before depressurizing the inside of the connecting member to the atmospheric pressure, and switches the three-way valve to connect the connecting member. The high-pressure gas remaining inside is collected in the low-pressure tank to reduce the pressure inside the connecting member.

When the pressure reducing operation in the connecting member is completed,
The connecting member can be detached from the connecting portion of the fuel tank with a light force.

[0007]

However, in the conventional gas supply apparatus, when the gas filling operation for the fuel tank of the automobile is completed, the worker performs the depressurizing operation by degassing as described above. Since the three-way valve provided at the tip of the valve is operated to open, high-pressure gas remains in the gas filling hose.

Therefore, for example, even when the power switch of the apparatus is turned off at the end of one day, the high-pressure gas remains in the gas supply line and the gas filling hose, and the next day starts. When the power switch is turned on in time, the gas filling work is performed immediately.
However, conventionally, in the gas supply device, the gas supply line and the inside of the gas filling hose are always kept at a high pressure, and the sealing member such as the connecting portion such as the gas filling hose gradually deteriorates and becomes thin, and gas leakage occurs. It was likely to occur.

Therefore, an object of the present invention is to provide a gas supply device which solves the above problems.

[0010]

The invention according to claim 1 is
A gas supply tank for storing a compressed gas, a gas supply pipe having one end connected to the gas supply tank and the other end connected to a filled tank, and the gas supply pipe,
A gas supply opening / closing valve that is opened when the gas supplied from the gas supply tank is filled in the filled tank, a low pressure pipe branching from the vicinity of the other end of the gas supply pipe, and the low pressure pipe. And a power switch for turning off the power source for driving each device, and the valve means for releasing the residual pressure of the gas supply line to the low pressure line by turning off the power switch. And a control means for switching.

Further, the invention of claim 2 is a gas supply tank for storing compressed gas, and a gas supply line having one end connected to the gas supply tank and the other end connected to a filling tank. A gas supply opening / closing valve, which is disposed in the gas supply pipeline and is opened when the gas supplied from the gas supply tank is filled in the tank to be filled, and a branch near the other end of the gas supply pipeline. From the gas supply tank to the gas supply line by turning on the power switch for turning on the power source for driving each device; And a control means for opening the gas supply on-off valve so as to supply the pressure.

[0012]

According to the first aspect of the present invention, the pressure of the gas supply line can be reduced by switching the valve means so that the residual pressure of the gas supply line is released to the low pressure line by turning off the power switch. It is possible to extend the life of the gas supply line by depressurizing the gas supply line when the device is stopped.

Further, by opening the gas supply on-off valve so that the pressure from the gas supply tank is supplied to the gas supply line by turning on the power switch, the pressure in the gas supply line can be adjusted before starting the gas filling. It can be kept high and the next gas filling operation can be carried out promptly.

[0014]

1 to 5 show an embodiment of the gas supply device according to the present invention.

In FIG. 1, the gas supply device 1 is installed, for example, in a gas supply station for supplying compressed natural gas (CNG) obtained by compressing city gas to a predetermined pressure to a fuel tank (filled tank) 3 of an automobile 2. ing. The compressed natural gas is an example, and the gas handled by the gas supply device 1 is not limited to this, and includes other gases that are compressed and used in a high pressure range from atmospheric pressure to about 200 atm.

The gas supply device 1 generally includes a pressure generation unit 4 for increasing the pressure of city gas to a predetermined pressure, a dispenser unit 5 for supplying the gas compressed by the pressure generation unit 4 to the fuel tank 3, and these pressures. The control unit 6 controls each device of the generation unit 4 and the dispenser unit 5.

The pressure generating unit 4 supplies the gas from an intermediate pressure line (not shown) to which city gas is fed at an intermediate pressure (pressure higher than the pressure used at home) via an upstream line 7. It is compressed by the multi-stage compressor 8. The compressor 8 is provided with, for example, a plurality of (3 or 4) cylinders for compressing gas, and the gas compressed in the preceding cylinder is pressurized to a higher pressure in the next cylinder. The gas supplied from the medium pressure line is compressed stepwise.

Further, the compressor 8 has a variable pressure line 9
And the high-pressure pipeline 10 are connected in parallel, and check valves 11 and 12 that prevent compressed gas from flowing back to the compressor 8 are arranged in the pipelines 9 and 10, respectively. The variable pressure pipe 9 and the high pressure pipe 10 are respectively provided with a variable pressure gas accumulator 13,
It is connected to the high pressure gas pressure accumulator 14. The variable pressure gas accumulator 13 and the high pressure gas accumulator 14 are generally referred to as gas accumulators in the literature.

In this embodiment, when the maximum pressure of the fuel tank 3 is 200 kgf / cm ² , the maximum pressure of the variable pressure gas accumulator 13 and the high pressure gas accumulator 14 is 250 kgf / cm ^2.
Set to cm ² . Therefore, the compressor 8 compresses the city gas (about 5 to 8 kgf / cm ² ) supplied from the medium pressure line to bring the pressures of the variable pressure gas accumulator 13 and the high pressure gas accumulator 14 to the above set pressure.

Further, a discharge pipe line 15 for discharging gas from the variable pressure gas accumulator 13 and the high pressure gas accumulator 14 is provided.
On-off valves 17, 18 made of solenoid valves are arranged at 16. In addition, in FIG. 2 and later, the on-off valves 17 and 18 are set to V _{PA1,
Represented} as V _PA2 .

The discharge pipes 15 and 16 communicate with the gas supply pipe 19, and the variable pressure gas accumulator 13 and the high pressure gas accumulator 14 are connected to the fuel tank 3 via the gas supply pipe 19. To be done.

Further, the gas supply pipeline 19 is supplied from a gas supply opening / closing valve 20 (V _ES ) composed of an electromagnetic valve, a variable pressure gas pressure accumulator 13 and a high pressure gas pressure accumulator 14 in this order from the upstream side. A primary pressure transmitter 21 for detecting gas pressure, and a mass flowmeter 2 for measuring the amount of gas supplied to the fuel tank 3.
2, a pressure control valve 23 (V _PC ) for adjusting the gas pressure supplied to the fuel tank 3 to a predetermined pressure, and a secondary pressure transmitter (pressure detection means) for measuring the supply gas pressure supplied to the fuel tank 3. ) 24, and are provided.

A gas filling hose 26 communicates with the tip of the gas supply conduit 19, and a manual three-way valve 25 is arranged in the middle of the gas filling hose 26.

The three-way valve 25 has ports a, b and c, a gas filling hose 26 connected to the gas supply line 19 is connected to the port a, and a connection coupler 28 is connected to the port b.
Is connected. Further, a low pressure pipe 27 communicating with the low pressure side is connected to the c port. The low pressure line 27
A check valve 41 for preventing reverse flow of gas from the downstream side when the recovery valve 43 (V _k ) to be described later is opened is disposed in this.

Further, since the three-way valve 25 is arranged near the connecting coupler 28 which is the tip of the gas filling hose 26, the b port and the c port are filled after the gas filling of the fuel tank 3 is completed.
By communicating with the port, the residual gas downstream of the connecting coupler 28 can be discharged to the low pressure side via the low pressure pipe 27.

The mass flow meter 22 is a vibrating mass flow meter that vibrates a sensor tube through which gas passes and outputs a measurement signal to the control device 6 according to the phase difference between the inflow side and the outflow side due to the Coriolis force. The pressure resistance structure allows accurate measurement of the flow rate of relatively high pressure gas.

Then, in the pipe line 29 drawn out from the fuel tank 3, a connection coupler 30 as a connecting portion to which the connection coupler 28 is connected, and a manual on-off valve 31 for opening or closing the pipe line 29. A check valve 32 for preventing the gas filled in the fuel tank 3 from flowing out is provided.

The connecting couplers 28 and 30 each have a built-in check valve therein. When the couplers 28 and 30 are connected, the check valves are switched to the open state, and the couplers 28 and 3 are connected.
In the state where 0 is separated, the check valve is closed to prevent outflow of gas.

The three-way valve 25 connects the port a and the port b in the gas filling mode by the operator's switching operation, and connects the port b and the port c in the gas outflow mode after the gas filling. To switch to.

The three-way valve 25 is switched after the gas filling is completed, and the residual gas pressure in the connecting couplers 28, 30 is released to the low pressure pipe 27 to reduce the pressure in the connecting couplers 28, 30 to the atmospheric pressure. As a result, the pressure in the connecting couplers 28 and 30 is reduced to the extent that the connection releasing operation can be performed, so that the connection between the connecting coupler 28 and the connecting coupler 30 can be easily released.

Further, a low pressure pipe 42 is branched into the gas supply pipe 19 downstream of the secondary pressure transmitter 24. Then, the low pressure pipe 42 near the gas supply pipe 19 is branched off.
A recovery valve 43 and a check valve 44, which are electromagnetic valves, are arranged in the. Then, the low pressure pipe 4 downstream of the check valve 44
The low-pressure pipe 27 described above is connected to 2 so as to join. Therefore, the residual gas recovered by the switching operation of the three-way valve 25 and the opening of the recovery valve 43 is used for the low pressure pipe 27.
And is collected in the low-pressure tank 45 on the low-pressure side via the low-pressure pipe 42.

The recovery valve 43 is opened by a command from the control device 6 when the power switch 39 is turned off, and closed when the power switch 39 is turned on, as described later. That is, in the gas supply station in which the gas supply device 1 is installed, for example, at the end of the day, the power switch 39 is turned off to finish the work of the day, and the power switch 39 is turned on at the start of the next day. To enable gas filling work.

Therefore, in the gas supply device 1, the residual gas pressure in the connection couplers 28 and 30 is reduced by switching the three-way valve 25 after the end of gas filling from the start time to the end time of the gas supply station. Tank 4
The power switch 39
When the switch is turned off, the recovery valve 43 opens and the residual gas pressure in the gas supply conduit 19 and the gas filling hose 26 can be automatically recovered in the low pressure tank 45.

The control device 6 is connected to each of the above devices, and is also connected to a start button 33, a display 34, an alarm device 35, a filling display lamp 36, a gas discharge lamp 37, and a power switch 39.

In the memory 38 of the control device 6, a gas filling work program and a power switch 39 are stored, as will be described later.
By turning off the gas supply line 19 and the gas filling hose 26
Of the variable pressure gas accumulator 13 or the high pressure gas accumulator 14 to the gas supply conduit 19 and the gas filling hose 26 by opening the recovery valve 43 so as to allow the residual pressure of the above to escape to the low pressure conduit 42. A control program for opening the gas supply opening / closing valve 19 so as to supply the above pressure and an abnormality detection program for checking the abnormality detection of each device are stored.

Next, the gas filling work in the gas supply device 1 having the above-mentioned configuration and the process executed by the control device 6 will be described.

2 to 4 are main flowcharts executed during the gas filling operation.

The worker attaches the connecting coupler 28 provided at the tip of the gas supply line 19 to the connecting coupler 30 of the fuel tank 3.
After that, the manual on-off valve 31 is opened.
The three-way valve 25 is normally set in a state where the a port and the b port are in communication with each other. Then, the operator confirms the connection work and the valve operation, and turns on the start button 33.

In FIG. 3, the control device 6 reads the pressure value from the secondary pressure transmitter 24 in step S1 (hereinafter “step” is omitted), and the connecting coupler 28 makes the connecting coupler 30.
Make sure you are connected to. That is, the connection coupler 2
When 8 and 30 are normally connected and the manual on-off valve 31 is open, the residual pressure of the fuel tank 6 is detected. If the connection couplers 28 and 30 are not properly connected, air is introduced from the connection coupler 28, so that atmospheric pressure is detected. In that case, the alarm device 35 is used.
A further alarm is issued and a message such as "coupler connection failure" is displayed on the display unit 28 to stop the apparatus.

Next, all solenoid valves, that is, the on-off valves 17, 1
8, gas supply on-off valve 20, pressure control valve 23, recovery valve 43
Is confirmed to be in the initial state where the valve is closed (S2),
The on-off valve 17 is opened (S3). As a result, the gas accumulated in the variable pressure gas accumulator 13 is supplied to the gas supply pipeline 19 via the pipeline 15.

In S4, the supply pressure P _in detected by the primary pressure transmitter 21 and the filling pressure P _out of the fuel tank 3 detected by the secondary pressure transmitter 24 (where the filling pressure P _out is the fuel tank 3). (Which is considered to be equivalent to the pressure of), (P _in −
It is checked whether P _out ) is greater than or equal to a preset specified value.

That is, when P _in -P _out is equal to or larger than the preset specified value, it is determined that the fuel tank 3 is low in pressure and can be filled.

Therefore, in S4, P _in -P _out
If is equal to or greater than the preset specified value, the process proceeds to S5, and the filling display lamp 36 is turned on to inform the operator that filling is possible. Subsequently, the gas supply opening / closing valve 19 is opened (S6), and the pressure control valve 23 is opened (S6).
7). With this, the filling of the gas into the fuel tank 3 is started.

When P _in- P _out is less than the preset specified value _in S4, S5 to S10
The process is omitted and the process proceeds to S11 described later.

In the next step S8, the valve opening of the pressure control valve 23 is controlled to perform constant pressure increase control. Then, in S9, the filling pressure P _out detected by the secondary pressure transmitter 24 is 2
Check if it has reached 00 kgf / cm ² . if,
When the filling pressure P _out is 200 kgf / cm ² or less, the process proceeds to S10, and it is checked whether the differential pressure P _in- P _out is equal to or more than a preset specified value.

In S9, the secondary pressure transmitter 2
When the filling pressure P _out detected at 0 reaches 200 kgf / cm ² , the gas filling is completed, and the process proceeds to S11 to close the gas supply opening / closing valve 16. Further, in S12, the pressure control valve 1
After closing the valve 9, the open / close valve 13 on the variable pressure side is closed in S13. After that, the processing shifts to S24, which will be described later, and the processing from S24 onward is executed.

In S10, when P _in −P _out ≧ the specified value, the process returns to S8 and the processes of S8 to S10 are repeated. However, in S10, when P _in −P _out <specified value, the process proceeds to S14, the on-off valve 17 is closed, and S
At 15, the open / close valve 18 on the high pressure side is opened. This allows
The high-pressure gas accumulated in the high-pressure gas accumulator 14 is supplied to the gas supply pipeline 19 via the pipeline 16.

In S16 shown in FIG. 3, the primary pressure transmitter 2
1 between the supply pressure P _in detected by the secondary pressure transmitter 24 and the filling pressure P _out of the fuel tank 3 detected by the secondary pressure transmitter 24 (P
_in -P _out) to check whether a pre-set specified value or more. That is, as in the case of S4 described above, when P _in -P _out is equal to or greater than the preset specified value, it is determined that the fuel tank 3 has a low pressure and can be filled.

Therefore, in S16, P _in -P
_{If out} is equal to or greater than the preset specified value, S1
7, the valve opening of the pressure control valve 23 is controlled to perform constant pressure increase control. Further, in S16, P _in -P _out
<If it is a specified value, the gas supply pressure from the high pressure gas pressure accumulator 14 is close to the filling pressure P _out of the fuel tank 3 that has been completely filled by the variable pressure gas pressure accumulator 13, so it is determined that filling is not possible. Then, the process proceeds to S21 described later.

Then, in S18, it is checked whether the differential pressure between P _{in and} P _out is equal to or more than a preset specified value. If P _in −P _out ≧ specified value,
In S19, it is checked whether the filling pressure P _out detected by the secondary pressure transmitter 24 has reached 200 kgf / cm ² .

At S19, the filling pressure P _out is 200 kg.
If it is less than f / cm ^2, the process returns to S17 and the processes of S17 to S19 are repeated. However, in S19, the filling pressure P _out
When ≧ 200 kgf / cm ² , it is judged that the pressure in the fuel tank 3 has reached the target of 200 kgf / cm ² , and S20
Then, the gas supply on-off valve 20 is closed.

In S18, P _in -P _out <
In the case of the specified value, the gas supply pressure from the high pressure gas pressure accumulator 14 is a value close to the filling pressure P _out of the fuel tank 3 that has been completely filled by the variable pressure gas pressure accumulator 13, so that When it is determined that the pressure has dropped significantly, the process proceeds to S21, an alarm is issued from the alarm device 35, and a message such as "There is an abnormality in the high pressure gas accumulator" is displayed on the display 34.

Further, after closing the pressure control valve 23 in S22, the on-off valve 18 on the high pressure side is closed in S23. Then, the filling display lamp 36 is turned off to notify the operator that the filling of the fuel tank 3 with the gas is completed (S2).
4). This completes a series of gas filling processes.

When the filling indicator lamp 36 is extinguished after the filling of the gas into the fuel tank 3 is completed, the operator operates the three-way valve 25 a.
Switch so that the port and the b port are communicated. As a result, the residual gas in the connecting couplers 28, 30 is collected in the low-pressure tank 45 via the low-pressure pipe 27, and the pressure in the connecting couplers 28, 30 is reduced to almost atmospheric pressure. Therefore, the pressure in the connection couplers 28 and 30 is reduced to the extent that the connection release operation can be performed, and the worker can easily release the connection between the connection coupler 28 and the connection coupler 30.

In this way, since the pressure inside the connecting couplers 28, 30 is reduced to almost atmospheric pressure, the same high pressure gas as the pressure filled in the fuel tank 3 remains in the gas filling hose 26 upstream of the three-way valve 25. ing. Therefore, when performing the next gas filling operation, the gas filling can be started immediately and the flow rate measurement error until the pressure in the gas filling hose 26 is increased can be reduced.

Next, the power switch interrupt processing shown in FIG. 4 will be described. The power switch interrupt process shown in FIG. 4 checks whether or not the power switch 39 is turned off every predetermined time.

In FIG. 4, when the operator turns off the power switch 39 at the end of the day in S31, the control device 6 proceeds to S32, in which all solenoid valves (open / close valves 17, 18,
The gas supply opening / closing valve 20, the pressure control valve 23, and the recovery valve 43) are closed.

In the next S33, the gas supply opening / closing valve 20 (V
After opening _ES ) temporarily, return it to the closed state.

Next, in S34, the recovery valve 43 (V _k )
Open the valve. By opening the recovery valve 43, the pressure control valve 23
The gas in the gas supply pipeline 19 and the gas in the gas filling hose 26 downstream from (V _PC ) are recovered in the low pressure tank 45 via the low pressure pipeline 42. Therefore, the pressure control valve 23 (V
Gas supply line 19 and gas filling hose 2 downstream from _PC )
The pressure of 6 is reduced to a pressure close to atmospheric pressure.

Further, in S35, the pressure control valve 23 (V
After temporarily opening the valve ( _PC ), return it to the closed state. As a result, the gas supply opening / closing valve 20 (V _ES ) and the pressure control valve 23
The gas remaining in the gas supply line 19 between (V _PC ) passes through the recovery valve 43 (V _k ) and flows out to the low pressure line 42.
Therefore, the pressures of the gas supply pipeline 19 from the gas supply on-off valve 20 (V _ES ) to the three-way valve 25 and the gas filling hose 26 are reduced.

In the next step S36, the supply pressure P _in detected by the primary pressure transmitter 21 is read and it is confirmed whether or not the pressure in the gas supply pipeline 19 is reduced to 10 kgf / cm ² or less. Therefore, in S36, the supply pressure P _in is 10 kgf / cm
^If it has not reached ² , the process returns to S35, and the pressure control valve 23 (V _PC ) is temporarily opened and then closed.

Then, in S36, the supply pressure P _in is 1
When the pressure reaches 0 kgf / cm ² , the pressures of the gas supply conduit 19 and the gas filling hose 26 have been sufficiently reduced, so that S37 is performed.
After the recovery valve 43 (V _k ) is closed, the power supply of the gas supply device 1 is turned off in S38, and a series of interrupt processing ends.

In this way, when the power switch 39 is turned off, the recovery valve 43 is opened and the gas in the gas supply conduit 19 and the gas filling hose 26 flows out to the low pressure conduit 42, so that the gas supply conduit The pressure in the passage 19 and the gas filling hose 26 can be reduced. Therefore, for example, when the power switch 39 is turned off at the end of the day, the pressures of the gas supply line 19 and the gas filling hose 26 are automatically lowered, and 200 kgf / cm ² is applied to the connection part of each device at night. It is possible to prevent each connection part from being damaged by being left under high pressure.

Next, the power switch interrupt processing shown in FIG. 5 will be described. The power switch interrupt process shown in FIG. 5 checks whether or not the power switch 39 has been turned on every predetermined time.

In FIG. 5, the control device 6 proceeds to S42 when the operator turns on the power switch 39 at the start time of the next day in S41, and proceeds to S42 where all solenoid valves (open / close valves 17, 18,
The gas supply opening / closing valve 20, the pressure control valve 23, and the recovery valve 43) are closed.

In the next S43, the on-off valve 17 (V _PA1 ) is opened to supply the gas accumulated in the variable pressure gas accumulator 13 to the gas supply conduit 19.

In S44, it is checked whether 5 seconds have elapsed since the opening / closing valve 17 (V _PA1 ) was opened. Then, after 5 seconds have elapsed, the process proceeds to S45, the supply pressure P _in detected by the primary pressure transmitter 21 is read, and it is confirmed whether or not the pressure in the gas supply pipeline 19 is increased to 200 kgf / cm ² or more. . Therefore, in S45, the supply pressure P
_{When in} has not reached 200 kgf / cm ² , it is determined that the pressure of the variable pressure gas pressure accumulator 13 is low, and the routine proceeds to S46, where the on-off valve 17 (V _PA1 ) is closed.

Then, the process proceeds to S47, where the on-off valve 18 (V
_PA2 ) is opened to supply the gas accumulated in the high-pressure gas accumulator 14 to the gas supply conduit 19. Then, returning to S45, the supply pressure P _in detected by the primary pressure transmitter 21 is read and it is confirmed whether or not the pressure in the gas supply pipeline 19 is increased to 200 kgf / cm ² or more.

At S45, when the pressure in the gas supply line 19 reaches 200 kgf / cm ² , a series of interrupt processing is terminated.

As described above, the operator turns on the power switch 39 at the start time of the next day, so that the pressure in the gas supply line 19 is automatically set to 200 kgf / cm ² before the gas filling work is performed. Can be kept. Therefore, as described above, the start button 33 is turned on and the start button 33 is turned on as shown in FIG.
When the gas filling process shown in (1) is executed, the gas filling into the fuel tank 3 can be started at the same time when the gas filling is started.

In this embodiment, in S43,
Although the on-off valve 17 (V _PA1 ) was opened, the gas supply on-off valve 20 and the pressure control valve 23 were opened along with this to increase the pressure of the gas supply pipeline 19 and the gas filling hose 26 to 200 kg.
The pressure may be increased to f / cm ² .

Next, the abnormality detection interrupt processing shown in FIG. 6 will be described. The abnormality detection interrupt process shown in FIG. 6 is executed every predetermined time.

In FIG. 6, the control device 6 reads the supply pressure P _in detected by the primary pressure transmitter 21 in S51, and the primary pressure of the gas supply pipeline 19 is equal to or higher than a predetermined maximum pressure (250 kgf / to check whether it was pressurized to cm ² or more).

When the primary pressure transmitter 21 detects a pressure higher than the maximum pressure (250 kgf / cm ² or higher) in S51, each device may be damaged.
2, the solenoid valves (open / close valves 17, 18, gas supply open / close valve 20, pressure control valve 23, recovery valve 43) are all closed, and the display unit 43 displays an abnormal portion, and the alarm device 35. Generate more alarms to inform workers.

In the next step S53, the filling pressure P _out detected by the secondary pressure transmitter 24 is read and the gas supply pipeline 19 is read.
Secondary pressure is higher than the predetermined maximum pressure (250kgf /
to check whether it was pressurized to cm ² or more).

In S53, when the pressure higher than the maximum pressure (250 kgf / cm ² or higher) is detected by the secondary pressure transmitter 24, there is a possibility that the secondary pressure transmitter 24 may break down or each device may be damaged. , S54, all solenoid valves (open / close valves 17, 18, gas supply on / off valve 20, pressure control valve 23, recovery valve 43) are closed, and an abnormal portion is displayed on the display 43, and an alarm device is provided. An alarm is issued from 35 to notify the operator.

In S55, the process of S55 is executed only while the fuel tank 3 is being filled with gas, and the supply pressure P _in detected by the primary pressure transmitter 21 and the secondary pressure transmitter 24 are detected. The filled pressure P _out is compared.

At S55, the supply pressure P _in is the filling pressure P
When it is smaller than _out , the primary pressure transmitter 21 or the secondary pressure transmitter 24 is abnormal, so the process proceeds to S56 and all solenoid valves (open / close valves 17, 18, gas supply on / off valve 20, pressure control). The valve 23 and the recovery valve 43) are closed, the abnormal portion is displayed on the display 43, and an alarm is issued from the alarm device 35 to notify the operator.

In the next step S57, it is checked whether or not the rate of change of the supply pressure P _in detected by the primary pressure transmitter 21 at times other than when the gas is being filled is larger than a preset specified value.

In S57, if the rate of change of the supply pressure P _in is larger than the specified value, it means that the primary pressure transmitter 21 has failed or gas leakage has occurred from the open / close valves 17 and 18 in the closed state. After making a judgment, the program proceeds to S58, in which all the solenoid valves (open / close valves 17, 18, gas supply open / close valve 20, pressure control valve 23, recovery valve 43) are closed, and the display 43
The abnormal part is displayed on the screen, and an alarm is issued from the alarm device 35 to notify the operator.

Further, in S59, the primary pressure transmission at the time of gas filling.
Supply pressure P detected by the feeder 21 _inThe change rate of
Check if it is less than the specified value.

If the rate of change of the supply pressure P _in is smaller than the specified value _in S59, it is determined that the primary pressure transmitter 21 has failed or the opening / closing valves 17 and 18 have insufficient valve opening degrees. And proceed to S60, where all solenoid valves (open / close valve 1
7, 18, the gas supply on-off valve 20, the pressure control valve 23, and the recovery valve 43) are closed, the abnormal portion is displayed on the display 43, and an alarm is issued from the alarm device 35 to notify the operator.

At the next step S61, the filling pressure P detected by the secondary pressure transmitter 24 while the fuel tank 3 is being filled with gas.
Check if _out has decreased sharply. S61
If the filling pressure P _out sharply decreases at 2,
When it is determined that the next pressure transmitter 24 is abnormal or gas leakage has occurred in the gas supply conduit 19 or the gas filling hose 26, the process proceeds to S62 and all solenoid valves (open / close valves 17, 18, gas supply on / off valve 20, The pressure control valve 23 and the recovery valve 43) are closed, an abnormal portion is displayed on the display 43, and an alarm is issued from the alarm device 35 to notify the operator.

Further, in S63, the supply pressure P _in detected by the primary pressure transmitter 21 while the fuel tank 3 is being filled with gas.
And the differential pressure P _in −P _out between the filling pressure P _out detected by the secondary pressure transmitter 24 is a predetermined value, but the mass flowmeter 22
Check if the flow measurement signal is output from. In S63, when gas is supplied to the fuel tank 3 but the flow rate measurement signal is not output from the mass flowmeter 22, the primary pressure transmitter 21 or the secondary pressure transmitter 24
It is determined that there is a malfunction in the mass flowmeter 22 or the malfunction in the mass flowmeter 22, and S64
Then, an abnormal portion is displayed on the display 43, and an alarm is issued from the alarm device 35 to inform the operator.

At the next step S65, the mass flowmeter 22
Check if the flow measurement signal is output from. In S65, when the mass flowmeter 22 outputs the flow rate measurement signal even though the gas is not supplied to the fuel tank 3, the mass flowmeter 22 is out of order, or gas leaks in the gas supply conduit 19 or the gas filling hose 26. Is determined to have occurred, the process proceeds to S66, and all solenoid valves (open / close valves 17, 18,
The gas supply opening / closing valve 20, the pressure control valve 23, the recovery valve 43) are closed, and an abnormal portion is displayed on the display 43,
Moreover, an alarm is issued from the alarm device 35 to notify the operator. This completes a series of interrupt processing for abnormality detection.

As described above, the control device 6 includes the solenoid valves (open / close valves 17 and 18, gas supply open / close valve 20, pressure control valve 2).
3, recovery valve 43), mass flowmeter 22, primary pressure transmitter 2
The presence or absence of an abnormality in each device such as the primary and secondary pressure transmitters 24 is regularly checked. If an abnormality occurs, the abnormality is immediately detected and the abnormal portion is indicated by the indicator 34.
Can be displayed on the screen to notify the operator. for that reason,
The operator can know the occurrence of the abnormality by the alarm of the alarm device 35, can identify the abnormal portion on the display 34, and can quickly perform the repair work.

In the above embodiment, the case where the compressed natural gas (CNG) obtained by compressing the city gas is supplied has been described 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.

In the above embodiment, the case where the power switch 39 is turned off at the end of working hours and the power switch 39 is turned on at the start of working hours is given as an example. However, the present invention is not limited to this. Of course, it can be applied to the case where the power switch 39 is turned off and the power switch 39 is turned on at the end time of the lunch break.

In the above embodiment, the case where the fuel tank 3 of the automobile 2 is filled with the compressed gas has been described as an example. However, the present invention is not limited to this, and a device for supplying the compressed gas to another container or the like. Needless to say, the present invention can also be applied to a device configured to be installed in the middle of a pipeline for simply feeding compressed gas to another place.

In the above embodiment, the city gas is compressed from the medium pressure pipeline before the city gas is branched to the home. However, the present invention is not limited to this. You may make it take out gas from the pipeline of.

[0091]

As described above, according to the first aspect of the present invention, the valve means is switched so that the residual pressure of the gas supply line is released to the low pressure line by turning off the power switch, so that the gas supply is performed while the apparatus is stopped. The pressure of the pipeline can be reduced to reduce the load on the gas supply pipeline and each device arranged in the gas supply pipeline, and the life of the gas supply pipeline and each device can be extended.

Further, according to the second aspect, since the gas supply opening / closing valve is opened so that the pressure from the gas supply tank is supplied to the gas supply pipeline by turning on the power switch, the next gas filling operation is performed. At this time, the gas is being supplied to the gas supply pipeline, and the pressure in the gas supply pipeline can be increased before performing the gas filling work, which allows the filling tank to be filled with gas at the same time when the gas filling work starts. It can be carried out.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a gas supply device according to the present invention.

FIG. 2 is a flowchart for explaining a process executed by a control device during a gas filling operation.

FIG. 3 is a flowchart of a process executed subsequent to the process of FIG.

FIG. 4 is a flowchart of interrupt processing when the power switch is turned off.

FIG. 5 is a flowchart of an interrupt process when the power switch is turned on.

FIG. 6 is a flowchart of an abnormality detection interrupt process of each device.

[Explanation of symbols]

 1 Gas Supply Device 3 Fuel Tank 4 Pressure Generation Unit 5 Dispenser Unit 6 Control Device 13 Variable Pressure Gas Accumulator 14 High Pressure Gas Accumulator 17, 18 Open / Close Valve 19 Gas Supply Pipeline 20 Gas Supply Open / Close Valve 21 Primary Pressure Transmitter 22 Mass flowmeter 23 Pressure control valve 24 Secondary pressure transmitter 25 Three-way valve 26 Gas filling hose 28,30 Connection coupler 31 Manual opening / closing valve 27,42 Low pressure line 43 Recovery valve 45 Low pressure tank

 ─────────────────────────────────────────────────── ─── Continuation of front page (71) Applicant 000003056 Tokiko Corporation 1-3-6 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa (72) Inventor Kazuo Kanai 6-9-6 Sodegaura, Narashino-shi, Chiba (72) Invention Akira Kobayashi, 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture, Osaka Gas Co., Ltd. (72) Inventor Manabu Hattori, 4-3 Kawanamoto-cho, Showa-ku, Nagoya, Aichi (72) Inventor, Tokio Yoshida 1-17-1 Chiyo, Hakata-ku, Fukuoka-shi, Fukuoka Seibu Gas Co., Ltd. (72) Inventor Kazuhiro Obara 1-6-3 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Tokiko Co., Ltd. (72) Inventor Shinji Kumagai 1-6-3 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Tokiko Corporation (72) Inventor Takuya Matsumoto 1-3-6 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Tokiko Corporation (72) Inventor Kenichi Abe 1-3-6 Fujimi, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Tokiko Corporation

Claims (2)

[Claims] 1. A gas supply tank for storing compressed gas; a gas supply pipe having one end connected to the gas supply tank and the other end connected to a filling tank; and a gas supply pipe connected to the gas supply pipe. A gas supply on-off valve which is provided and which is opened when the gas supplied from the gas supply tank is filled in the tank to be filled; and a low pressure pipeline branched from the vicinity of the other end of the gas supply pipeline, Valve means arranged in the low-pressure line, a power switch for turning off the power source for driving each device, and a switch for turning off the power switch to release residual pressure in the gas supply line to the low-pressure line. A gas supply device comprising: a control unit that switches the valve unit. 2. A gas supply tank for storing compressed gas, a gas supply pipe having one end connected to the gas supply tank and the other end connected to a filled tank, and a gas supply pipe provided in the gas supply pipe. A gas supply on-off valve which is provided and which is opened when the gas supplied from the gas supply tank is filled in the tank to be filled; and a low pressure pipeline branched from the vicinity of the other end of the gas supply pipeline, A valve means arranged in the low-pressure line, a power switch for turning on the power source for driving each device, and a pressure supply from the gas supply tank to the gas supply line by turning on the power switch. A gas supply device comprising: a control unit that opens a gas supply on-off valve.