JPH08301398A - Preventive device against overflow - Google Patents

Abstract

PURPOSE: To automatically and securely prevent overflowing of oil during charging operation. CONSTITUTION: A controller 3 judges the full level on the basis of the signals from a level detector 1a and outputs the full level signal from a radio transmitter 4. When a radio receiver 15 receives the full level signal, the second electromagnetic valve 14 changes over an air supply main pipe L to the outside air side and the controller 17 of a display-operatng unit 16 changes over the first electromagnetic valve 12a to the outside air through an interface box and further, automatically closes a bottom valve V1 to securely prevent overflowing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a plurality of hatches,
The discharge port of each hatch relates to an overflow prevention device for filling oil from a lorry connected to a discharge pipe via a bottom valve to a tank installed at a gas filling station and having a liquid level gauge.

[0002]

2. Description of the Related Art As is well known, there are various known techniques for reliably preventing an overflow when unloading a tank from a lorry, that is, at the time of oiling. The publication has proposed a technique for preventing oil blending and overflow.

However, according to the prior art, since the operator notifies the alarm device to close the bottom valve,
There is a risk of operation delay or erroneous operation. Further, in the above-mentioned known technique, since the Lorry connector is connected to the connector of the gas station, it is troublesome and troublesome.

[0004]

SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide an overflow prevention device capable of automatically and reliably preventing an overflow at the time of lubrication.

[0005]

According to the present invention, a plurality of hatches are provided, and the discharge port of each hatch is installed at a gas filling station from a lorry connected to a discharge pipe through a bottom valve. In an overflow prevention device for filling a tank having a level gauge, the filling station receives a signal from the liquid level gauge and determines that the tank is full, and a filling tank from the controller. A radio transmitter for transmitting a signal is provided, and the air supply pipe connected to the opening / closing drive unit of each of the bottom valves provided in the lorry is connected to the air supply main via the first solenoid valve. The supply main is connected to the air tank via the second solenoid valve, and the lory includes receiving means for receiving a signal from the wireless transmitter of the gas station, and a display operation unit for receiving the signal from the receiving means. , The control unit of the display operation unit And an interface box for receiving the signal of the second solenoid valve, the second solenoid valve is closed by a signal output when the receiving means receives a full signal from the wireless transmitter, and the first solenoid valve is It is configured to be closed by a signal output from the interface box when a full tank signal is input to the control unit.

The control unit of the display operation unit has a function of outputting a valve opening / closing signal of the first electromagnetic valve to the interface box in response to a valve opening / closing input from the keyboard of the display operation unit.

Further, when the receiving means does not receive the full signal, the control section of the display operation unit closes the second solenoid valve with respect to the interface box, and turns off the second solenoid valve by the unloading end signal. It has a function of outputting a signal to close the valve.

Furthermore, the first and second solenoid valves are three-way solenoid valves that open the air supply pipe when opened and open the air supply pipe to the atmosphere when closed.

[0009]

Therefore, when the liquid level gauge of the tank detects "full", the control device outputs a full signal to the radio transmitter by a signal from the liquid level gauge. When the receiving means receives the full signal, the second solenoid valve closes immediately,
Since air pressure is not supplied to the opening / closing drive of the bottom valve, the bottom valve is closed, and as a result, overflow can be prevented. That is, the full signal from the control device is the second
The command for closing the second solenoid valve is issued to the valve drive unit of the solenoid valve, and the valve closing command is directly transmitted to the second solenoid valve in this way, which is extremely preferable in terms of safety.

At the same time, the full signal is input to the control unit of the display operation unit, and the control unit outputs a valve closing signal to the interface box, so that the second solenoid valve is closed.
Therefore, a double safety device is configured, and it is safe even if the signal line is broken. In a normal operation, the control unit outputs a valve opening / closing signal to the interface box according to the valve opening / closing input from the keyboard of the display operation unit.
Therefore, the interface box receives the valve opening / closing signal set by the keyboard to open / close the first solenoid valve, so that the bottom valve of each hatch is opened / closed in accordance with the valve opening / closing signal, and predetermined unloading is performed.

[0011]

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

1 and 2, there are a plurality of (1 in the example of FIG. 1 and 2 in the example of FIG. 2) underground the site A of the gas station.
Oil storage tanks T1 and T2 are buried. These tanks T1 and T2 have liquid level gauges 1a and 1b, respectively.
And oil supply pipes 2a and 2b are provided. The liquid level gauge 1
Each of a and 1b is connected to a control device 3 provided in the office S, and a radio transmitter 4 and a display 5 are connected to the control device 3.

On the other hand, the tank truck R is provided with a plurality (three in the example of FIG. 1) of hatches H1 to H3 (hereinafter, reference numeral H is used when collectively referred to), and the discharge pipe 10a of each hatch H1 to H3. 10b (only two of which are shown in FIG. 2) are connected to the discharge pipe 22 via bottom valves V1 and V2, respectively.
Is connected, and an oil supply hose 21 is connected to the discharge pipe 22 via a coupling. The opening / closing drive units 11a and 11b of the bottom valves V1 and V2 are connected to the air supply main L from the air tank 13 by the air supply pipes L1 and L2 via the first electromagnetic valves 12a and 12b. The second solenoid valve 14 is connected to the air supply main L.
Is interposed.

The bottom valves V1 and V2 are open / close drive units 11
It is designed to open when air is supplied to a and 11b and close when air supply is cut off. The first solenoid valves 12a and 12b are three-way solenoid valves, which open when energized to allow air to flow, and when deenergized to open the outflow side to the atmosphere. Similarly, the second solenoid valve 14 is also a three-way solenoid valve, which is opened when energized to connect the air supply main L to the air tank 13, and closed when not energized to close the air supply main L to the atmosphere. It is open to the public.

Further, the tank truck R is provided with a radio receiver 15 which is a receiving means, and the radio receiver 15 has a valve drive unit 1 of the second solenoid valve 14 via a line L3.
4a is also connected to the display operation unit generally designated by the reference numeral 16 via a line L4.

The display / operation unit 16 is provided with a control unit 17 having a keyboard 18 and a display unit 19,
An interface box 20 is connected to the control unit 17. Then, in the interface box 20, the first solenoid valves 12a and 12b and the second solenoid valve 14 are provided.
And are connected respectively. Therefore, as will be described later, the second solenoid valve can be directly closed from the receiver 15 via the line L3, and can be opened / closed via the interface box 20 by a signal from the control unit 17. The first solenoid valves 12a and 12b are opened / closed by a signal from the interface box 20.

Next, the mode of lubrication will be described.

The tank truck R enters the fueling station S and connects the oil supply hose 21 to, for example, the oil storage tank T1. Then, the keyboard 18 is operated to input the opening / closing of the bottom valve V1 of the hatch H1, for example. Then, the control unit 17 outputs an unloading start signal from the interface box 20, opens the second electromagnetic valve 14 and, for example, the first electromagnetic valve 12a,
The bottom valve V1 opens to inject the oil in the hatch H1 and also outputs an unloading end signal, closes the second solenoid valve 14 and the first solenoid valve 12a, closes the bottom valve V1 and stops the lubrication. .

At this time, if the tank T1 is full before the unloading completion signal is output due to an erroneous operation of the keyboard or other reasons, the controller 3 becomes full based on the signal from the liquid level gauge 1a. Then, the wireless transmitter 4 outputs a full signal. Then, in response to the full signal received by the wireless receiver 15, the second solenoid valve 14 is closed to open the air supply main L to the atmosphere side, and the control unit 17 causes the first solenoid via the interface 20. The valve 12a is switched to the atmosphere side. Therefore, the bottom valve V1 is immediately closed by the double operation of closing the second solenoid valve 14 and the first solenoid valve 12a, and overflow is automatically and reliably prevented.

[0020]

As described above, according to the present invention, the following excellent effects are exhibited. (1) The full signal from the control device at the gas station directly closes the second solenoid valve, so the operation is quick and safe. (2) A full tank signal is input to the interface box from the control unit of the display operation unit, and the second solenoid valve is closed, which is doubly safe. (3) It is convenient because there is no need to connect the lorry and gas station with a signal line.

[Brief description of drawings]

FIG. 1 is a side view of a tank truck and a gas station showing an embodiment of the present invention.

FIG. 2 is a control block diagram implemented in the present invention.

[Explanation of symbols]

 H ... Hatch L1, L2 ... Air supply pipe L ... Air supply main R ... Tank lorry S ... Gas station T ... Oil storage tank V ... Bottom valve 1a, 1b ... Liquid level gauge 2a ... lubrication pipe 3 ... control device 4 ... wireless transmitter 5 ... display 10a, 10b ... oil feeding pipes 11a, 11b ... opening / closing drive units 12a, 12b. ..First solenoid valve 13 ... Air tank 14 ... Second solenoid valve 15 ... Wireless receiver 16 ... Display operation unit 17 ... Control unit 18 ... Keyboard 19 ... Indicator 20 ... Interface box 21 ... Lubrication hose

Claims (4)

[Claims] 1. A tank having a plurality of hatches, each hatch having a discharge port connected to a discharge pipe through a bottom valve, to a tank installed at a gas station and having a liquid level gauge. In the overflow prevention device at the time of operating, a gas station is provided with a control device that receives a signal from the liquid level gauge and determines that the tank is full, and a wireless transmitter that transmits a full tank signal from the controller. The air supply pipe connected to the opening / closing drive unit of each of the bottom valves provided on the lorry is connected to the air supply main via the first solenoid valve, and the air supply main is connected to the second main
Receiving means for receiving a signal from the wireless transmitter of the gas station, a display operation unit for receiving the signal from the receiving means, and a display operation unit for the display operation unit. An interface box for receiving a signal from the control unit, the second solenoid valve is closed by a signal output when the receiving means receives the full signal from the wireless transmitter, and the first solenoid valve Is provided so that it is closed by a signal output from the interface box when the full signal is input to the control unit. 2. The overflow prevention device according to claim 1, wherein the control unit of the display operation unit has a function of outputting a valve opening / closing signal of the first electromagnetic valve to the interface box in response to a valve opening / closing input from a keyboard of the display operation unit. . 3. The control unit of the display operation unit closes the second solenoid valve to the interface box when the receiving means does not receive the full signal, and the second solenoid valve is operated by the unloading end signal. The overflow prevention device according to claim 1, which has a function of outputting a signal for closing the valve. 4. The overflow prevention device according to claim 1, wherein the first and second solenoid valves are three-way solenoid valves that open the air supply pipe when the valve is opened and open the air supply pipe to the atmosphere when the valve is closed.