JP2002206699A - Safety device of high pressure gas tank truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device for keeping a master valve from being opened when a filling hose of the base side is not completely connected to a connecting port 6 of a high pressure tank truck. SOLUTION: A high pressure tank truck is a transport vehicle in which an under carriage of a traveling vehicle is loaded with a high pressure tank, the tank is filled with high pressure gas at the base, and high pressure gas is supplied to a high pressure tank installed at a customer. A connecting port 6 connected to a base side filling hose piped from the high pressure gas tank 1 through an emergency cutoff valve 2 and the mater valve 14 is provided with a connection detector 22 for detecting the connection of the filling hose, and the master valve 14 is opened and closed by fluid pressure. When the connection detector 22 is ON, the master valve 14 can be opened so as to secure safety in filling high pressure gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a high-pressure gas tank truck, and more particularly to a device for ensuring safety when a high-pressure gas tank truck is filled with a high-pressure gas (liquid) at a base or the like.

[0002]

2. Description of the Related Art A high-pressure gas tank truck is a transport vehicle in which a high-pressure gas tank is mounted on an undercarriage of a traveling vehicle, a high-pressure gas is charged at a base, and supplied to a high-pressure gas storage tank installed by a customer. Equipment for supply is equipped.

FIG. 3 is a diagram showing a conventional typical piping system for filling a high-pressure gas tank lorry with a high-pressure gas at a base, and equipment and piping for supplying a high-pressure gas to a customer are omitted. In the lower part of the high-pressure gas tank 1,
Emergency shutoff valves 2 and 3 are provided, a connection port 6 connected to a filling hose on the base side is provided at a tip of a pipe 10 from the emergency shutoff valve 2, and a tip of a pipe 11 from the emergency cutoff valve 3. Is provided with a connection port 7 connected to a gas hose on the base side. Main valves 4 and 5 which are manually opened and closed are provided near the connection ports 6 and 7 of the pipes 10 and 11, respectively.

The emergency shutoff valves 2 and 3 are opened and closed by the operation of a manual hydraulic pump 8. In the event of an emergency such as an impact on the vehicle body during the filling operation, the hydraulic piping 12 is opened. Releases internal pressure to release emergency shut-off valves 2, 3
Is closed. When filling the high pressure gas at the base, the filling hose on the base side is connected to the connection port 6, the gas hose is connected to the connection port 7, the hydraulic pump 8 is operated to open the emergency shutoff valves 2, 3, The main valve 4 and the main valve 5 are operated to open.

[0005] Thereby, the high-pressure gas at the base flows from the filling hose into the high-pressure gas tank 1 through the emergency shut-off valve 2,
The gas in the high-pressure gas tank 1 is supplied from the emergency shutoff valve 3 to the pipe 11
Is discharged to the gas hose on the base side.

[0006]

When filling the high-pressure gas tank of the high-pressure gas tank truck with high-pressure gas, the filling hose and the gas hose must be securely connected to the connection port of the high-pressure gas tank truck. If the main valve is opened for filling high-pressure gas in a state of imperfect connection, the filling hose may suddenly come off, possibly causing liquid leakage.

[0007] Usually, fittings for confirming the connection are attached to the bases of the filling hose and the gas hose, and the connection of these hoses is incompletely connected by a specific person manually. It is done with great care so that it does not become. However, it cannot be said that inadvertent connection is inadvertently performed or the connection fitting is worn out.

Further, even if the emergency shutoff valve is closed due to an emergency during the filling operation, there is a problem that the filling is continued unless the main valve is closed. SUMMARY OF THE INVENTION In view of the above, the present invention provides a safety device in which the base valve cannot be opened unless the filling hose on the base side is completely connected to the connection port of the high-pressure gas tank truck.

[0009]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is, a connection for detecting when a filling hose is connected to a connection port provided through a main valve that opens and closes by fluid pressure from an emergency shut-off valve attached to the lower part of the high-pressure gas tank for connection with the filling hose on the base side. A detector is provided, and the main valve can be opened when the connection detector is ON.

The safety device for a high-pressure gas tank truck according to the present invention prevents a filling operation from being performed when a high-pressure gas is charged at a base or the like while the connection with the filling hose at the base is incomplete. It is simple to use a limit switch or a proximity sensor as the connection detector for detecting that the filling hose on the base side is connected to the connection port of the high-pressure gas tank truck. The main valve uses a valve that opens and closes with pneumatic or hydraulic pressure.A solenoid valve is provided in this open / close piping, and when the connection detector is OFF, the solenoid valve operates even when the main valve is opened. Do not let it.

The opening and closing of the emergency shutoff valve may be manually performed or performed by fluid pressure, but the present invention is not particularly limited. In the case of opening and closing with a commonly used fluid pressure, a pressure detector is provided in the pipe for opening and closing as described in claim 2, and only when the connection detector and the pressure detector are ON. If you open the main valve,
Even when an emergency occurs during the filling operation, the main valve is immediately closed, so that safety during the filling can be ensured.

It is desirable to connect the gas hose on the base side in the same manner in order to reduce the internal pressure of the high-pressure gas tank.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a safety device for a high-pressure gas tank truck according to the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a piping system for filling high-pressure gas at a base of a high-pressure gas tank truck.
The same reference numerals indicate the same parts.

1 is a high-pressure gas tank mounted on a high-pressure gas tank truck, and 2 and 3 are emergency shut-off valves. A main valve 14 that is operated by air pressure is provided in a pipe 10 from the emergency cutoff valve 2, and a connection port 6 that is connected to a filling hose on the base side is provided at a tip of the pipe 10.

As shown in FIG. 2A, when the connection port 6 is connected to the filling hose 24, the connection fitting 2 of the filling hose 24 is used.
There is provided a fitting portion 6a which engages with the engagement portion 4a. A connection detector 22 (here, a limit switch is used) is provided in the vicinity thereof.

When the filling hose 24 is connected to the connection port 6, as shown in FIG.
b pushes the detection lever of limit switch 22 and turns on
become. Then, the connection fitting 24 a of the filling hose 24 is rotated to be fitted to the fitting portion 6 a of the connection port 6.

The piping 11 from the emergency shutoff valve 3 also
A main valve 15 operated by air pressure is provided similarly to the pipe 10 of the emergency shutoff valve 2, and a connection port 7 connected to a gas hose on the base side is provided at a tip of the pipe 11. A connection detector 23 (limit switch) is provided in the vicinity thereof.

The main valve 14 and the main valve 15 are the air tank 1 of the brake used for running the high pressure gas tank truck.
7 and a solenoid valve 16 is provided on the way. The emergency shutoff valves 2 and 3 are connected to a manual hydraulic pump 8 by a hydraulic pipe 12, and a pressure detector 2
1 is provided.

An electromagnetic valve 16 for opening and closing the main valves 14, 15 is connected to an operation switch 19 via a controller 18. Further, the controller 18 is connected to the pressure detector 21 and the limit switches 22 and 23 by wiring.
When the operation switch 19 is turned on, the controller 18 sets both the pressure detector 21 and the limit switches 22 and 23 to O.
Only in the case of N, a command to switch the electromagnetic valve 16 is issued, compressed air is sent from the air tank 17 to the main valves 14, 15, and the main valves 14, 15 are opened.

When the high-pressure gas tank 1 is filled with high-pressure gas at the base, the filling hose and the gas hose on the base side are first connected to the connection ports 6 and 7, respectively. After operating the emergency shutoff valves 2 and 3 by operating the operation switch 8, the operation switch 19 is turned on. At this time, if the limit switches 22 and 23 and the pressure detector 21 are ON, the controller 18 sends the electromagnetic valve 1
6, the compressed air is sent from the air tank 17 to the main valves 14 and 15 to release the compressed air. When either of the limit switches 22 and 23 is OFF, or when the emergency shutoff valves 2 and 3 are opened. When is not open, the solenoid valve 16 is not switched, and the main valves 14, 15 remain closed.

If an emergency occurs during the filling operation, the pressure of the hydraulic oil in the hydraulic pipe 12 is reduced to close the emergency shut-off valves 2 and 3.
Since it becomes FF, the solenoid valve 16 is switched and the main valve 1
4, 15 are closed.

[0022]

As described above, the safety device for a high-pressure gas tank truck according to the present invention is connected to a filling hose on the base side via a main valve which opens and closes with a fluid pressure from an emergency shut-off valve provided at the lower part of the high-pressure gas tank. A connection detector that detects when a filling hose is connected is provided at the connection port that is connected by piping, and the main valve can be opened when the connection detector is ON, so that the filling hose is connected to the connection port. When the connection is not firmly made, the main valve will not be opened even if the opening operation is performed, and it is safe.

In the case where the opening and closing of the emergency cutoff valve is operated by hydraulic pressure, a pressure detector is provided in the hydraulic piping for opening and closing the emergency cutoff valve, and the connection detector and the pressure detector are connected to each other by O.
If the main valve can be opened only at the time of N (claim 2), the main valve is also closed when an emergency occurs during the filling operation, so that the filling is stopped and the safety is ensured. .

[Brief description of the drawings]

FIG. 1 is a piping diagram showing a configuration of an embodiment of a safety device for a high-pressure gas tank truck according to the present invention.

FIG. 2A is a plan view showing a filling hose on the base side and a receiving port of a high-pressure gas tank truck, and FIG. 2B is a plan view showing a connected state.

FIG. 3 is a piping diagram for filling a conventional high-pressure gas tank truck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... High-pressure gas tank 2 ... Emergency shut-off valve (liquid) 3 ... Emergency shut-off valve (gas) 4 ... Main valve (liquid) 5 ... Main valve (gas) 6 ... Connection port (liquid) 6a ... Fitting part 7 ... Connection port (Gas) 8 ... Hydraulic pump 10 ... Piping (liquid) 11 ... Piping (gas) 12 ... Hydraulic pipe 14 ... Main valve (liquid) 15 ... Main valve (gas) 16 ... Electromagnetic valve 17 ... Air tank 18 ... Controller 19 ... Operation switch 21 ... Pressure detector 22, 23 ... Connection detector 24 ... Filling hose 24a ... Connection fitting 24b ... Hose mouth end 25 ... Gas hose

Claims (2)

[Claims] 1. When a filling hose is connected to a connection port provided through a main valve that opens and closes with a fluid pressure from an emergency shut-off valve provided at the lower part of a high-pressure gas tank for connection with a filling hose on the base side, A safety device for a high-pressure gas tank lorry, wherein a connection detector for detecting the connection is provided, and the main valve can be opened when the connection detector is ON. A pressure detector is provided in a hydraulic piping for opening and closing the emergency shut-off valve by hydraulic pressure so that the main valve can be opened when the connection detector and the pressure detector are ON. The safety device for a high-pressure gas tank truck according to claim 1, wherein: