JPS5912555B2 - Liquid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid supply device, and an object of the present invention is to provide a liquid supply device that has a simple configuration and can effectively prevent fires or explosions caused by earthquakes, vehicle collisions, etc. .

Conventional fluid supply systems, such as ground-mounted or ceiling-suspended refueling systems at gas stations, supply oil stored in an underground tank via a refueling meter or a refueling metering unit installed above ground. Therefore, if the refueling pipe installed in the refueling meter etc. is damaged due to an unexpected disaster such as an earthquake or a vehicle collision during refueling, the oil fluid leaked to the outside from the damaged part will be released. This had the disadvantage that it could catch fire and cause the oil in the underground tank to go up in flames, leading to a major fire or explosion.

The present invention eliminates the above-mentioned drawbacks, and each embodiment thereof will be described below with reference to the drawings.

Fig. 1 is a schematic diagram of an embodiment of the liquid supply device of the present invention;
The figure shows a vertical cross-sectional view of the main part of an example of the seismic intensity meter, FIG. 3 shows a circuit system diagram of one embodiment of the relay circuit, and FIG. 4 shows a schematic configuration diagram of another embodiment of the liquid supply device of the present invention. .

In Fig. 1, reference numeral 1 denotes a refueling meter, which is placed and fixed at a suitable location within the refueling service area, and inside it includes a refueling pump 2, a motor 3 for driving the refueling pump, a flow meter 4, and a flow rate measured by the flow meter 4. A refueling amount counter 5 for instructing integration, a relay unit 20 to be described later, and the like are provided.

Reference numeral 6 denotes a suction pipe of the oil supply pump 2, and its tip opening opens near the bottom of an underground tank in which oil liquid 7a is stored via air 7b.

Reference numeral 8 denotes a discharge pipe of the oil supply pump 2, which is connected via a flow meter 4 to a oil supply hose 9 having a oil supply nozzle 9a at its tip.

Reference numeral 10 denotes a branch pipe, which branches from the suction pipe 6 buried underground, and its tip opens into the upper part of the underground tank 7.

11 and 12 are both electromagnetic on-off valves, each with a solenoid 11.
a and 12a, and are disposed in the suction pipe 6 and in the branch pipe 10, respectively, on the upstream side of the branch point.

22 is a pipe that communicates the underground tank 7 with the outside air, and both ends thereof open into the space above the underground tank 7 and the refueling service area, respectively.

13 is a spherical drop type seismic intensity meter, which is placed and fixed on the ground near the refueling meter 1, and has an earthquake-sensing section 13-m shown in Fig. 2 inside.
For example, n pieces (13-1 to 13-n) are arranged,
A predetermined seismic sensing section 13-m corresponding to each seismic intensity m operates and digitally displays the seismic intensity m on the seismic intensity display 14.

In FIG. 2, a spherical body 15 is supported with a part of its surface abutting against the spherical contact surface 16a of the spherical support member 16 during normal operation.

A ball receiving member 17 is surrounded by a side wall 17a and has an inclined bottom surface, and a hemispherical recess 17b into which the sphere 15 fits is bored in the bottom of the inclined surface of the ball receiving member 17.

Reference numeral 18 denotes a normally closed limit switch, and its operating piece 19 projects from below the ball receiving member 17 into the recess 17b.

Note that the sphere 15 falls from the sphere support member 16, and the recess 17
b, the actuating piece 19 is pushed downward in FIG. 2, and the limit switch 18 is opened.

Furthermore, the diameter d of the spherical contact surface 16a of the spherical support member 16 is different between each of the vibration sensing parts 13-1 to 13-n, and therefore, the diameter d of each vibration sensing part 13-n is different depending on the size of the can diameter d. The seismic intensity m detected by m is different.

The relay unit 20 includes a relay circuit 20a shown in FIG.
Built-in.

In the relay circuit 20a, relays R1 to Rn are connected to each vibration sensing section 13.
The limit switches 18-1 to 13-n are connected in series to the normally closed contacts 18-1 to 18-n of the limit switches 18, respectively.

Also, '1-1 ``'' r (1-1 is each relay R1 to R
n normally open contacts, both of which are connected to a seismic intensity display 14 to digitally display the maximum seismic intensity of an earthquake.

Ik-2t rl (-s. rk) is each contact point of the relay Rk corresponding to the set seismic intensity k among the relays R1 to Rn, and is connected in series with the motor 3 and the solenoids 11a and 12a, respectively.

Reference numeral 21 denotes a manual or automatic switch for starting and stopping the motor 3, and is connected to the motor 3 in parallel with the contact point rk2.

The seismic intensity setting is set to the minimum or lower value of the seismic intensity such that the refueling meter 1 will be destroyed if an earthquake with a higher intensity occurs.

Next, the operation of the above-mentioned component device will be explained.

In normal times, the sphere 15 of each vibration sensing part 13-m is connected to the sphere support member 1.
6, and for this reason each limit switch 1
8 normally closed contacts 18-1 to 18-n are closed.

Therefore, the coils of the relays R1 to Rn are energized, and by the excitation of the relays, the normally closed contacts '-2 and rk-4 are opened, and the normally open contacts rk-3 are closed.

As a result, the solenoid 11a is energized and the solenoid valve 1 is energized.
1 is open, while the solenoid 12a is not energized and the electromagnetic on-off valve 12 is closed.

Further, the motor 3 cannot be started unless the switch 21 is closed.

After the refueling nozzle 9a is removed from the refueling meter 1 in order to refuel the automobile, the switch 21 is closed to start the motor 3, and the pump 2 is driven.

Next, when the refueling nozzle 9a is inserted into the fuel tank (not shown) of the automobile and then opened, the oil liquid 7a in the underground tank 7 is transferred to the suction pipe 6, the electromagnetic shut-off valve 11, the pump 2, and the flow meter 4. , the fuel tank is supplied with fuel via the fuel supply hose 9 and the like.

At this time, the flow rate of the oil liquid 7a passing through the flow meter 4 is integrated and displayed on the oil supply amount counter 5.

Suppose now that an earthquake occurs and the seismic intensity meter 13 detects a set seismic intensity k.

At this time, 13 n seismic sensing parts 13-1 to 13- of the seismic intensity meter
Of the seismic intensity k and below, the seismic sensing section 13-
The spheres 15 numbered 1 to 13- fall from the sphere support member 16.

When the sphere 15 rolls into the recess 17b of the ball receiving member 17,
The actuating piece 19 is pushed downward, and each limit switch 18
Normally closed contacts 18-1 to 18-k are opened.

As a result, relays R1 to Rk are demagnetized and normally closed contact rk
-2t rk-4 is closed and normally open contact r1
-1~fk 1) rk 3 is opened and formed.

As a result, regardless of whether oil is being supplied or not, the motor 3 is energized, the solenoid 11a is de-energized and the electromagnetic on-off valve 11 is closed, and the solenoid 12a is energized and the electromagnetic on-off valve 12 is opened. .

As described above, since the electromagnetic on-off valve 11 closes and the electromagnetic on-off valve 12 opens, only a small amount of the oil 17a that remains on the downstream side of the electromagnetic on-off valve 11 is discharged by the pump 2 from the oil supply nozzle 9a into the fuel tank. Then, the air 7b in the upper space of the underground tank 7 is discharged from the fuel nozzle 9a via the branch pipe 10, the suction pipe 6, the discharge pipe 8, etc.

Note that at this time, since the air 7b in the underground tank 7 is communicating with the outside air via the pipe 22, air is continuously discharged from the fuel nozzle 9a.

Therefore, even if a fire occurs in the refueling service area due to an earthquake or the refueling meter 1 collapses, only air will be discharged from the discharge pipe 8 instead of the oil 7a, resulting in a large fire accident or dog explosion. It will not develop into an accident.

Furthermore, when the seismic intensity meter 13 is activated, the seismic intensity display 14 displays the seismic intensity k at that time together with a warning, giving a warning to customers and other refueling workers at the gas station.

In addition, when the seismic intensity m of the earthquake is less than the set seismic intensity, the normally closed contacts 18-1 to 18-m of each limit switch 18 of the seismic sensing section 13-m (however, m<k) operate in accordance with the seismic intensity m.
is opened, but the normally closed contact 18- of the limit switch 18 of the seismic part, which opens at a seismic intensity higher than the set seismic intensity,
-n is not opened.

Therefore, relays Rk-Rn are not demagnetized, so normally closed contacts rk-2 and rk-4 are not closed, and normally open contacts rk-
3 is not opened, the electromagnetic on-off valves 11 and 12 do not operate, and the seismic intensity m is simply displayed on the seismic intensity display 14 to notify customers and others so as not to cause confusion.

Therefore, if the switch 21 is closed at this time, the motor 3 is in a state where it can be started and refueled.

Next, another embodiment of the liquid supply device of the present invention will be described with reference to FIG. 4.

In FIG. 4, the same components as those in FIG. 1 are given the same reference numerals, and their explanations will be omitted.

23 is a fuel metering unit, inside which a fuel pump 2,
A motor 3, a flow meter 4, etc. are provided.

A delivery unit 24 is disposed on the ceiling of the building 25, and a refueling hose 9 is wound and stored inside the delivery unit.

The refueling hose 9 is a discharge pipe 8 arranged inside the building 25.
When refueling, the nozzle 9a is lowered together with a refueling nozzle 9a disposed at its tip to a position where it can refuel a fuel tank (not shown) of a vehicle or the like to be refueled.

If an earthquake occurs while the refueling pump 2 is being driven to refuel with the solenoid on-off valve 11 open and the solenoid on-off valve 12 closed, the relay unit 20 is activated by the seismic sensor 13. Through this, the electromagnetic on-off valve 11 is closed and the electromagnetic on-off valve 12 is opened.

As a result, the air 7b in the underground tank is sucked into the fuel pump 2 and discharged to the outside from the fuel nozzle 9a via the branch pipe 10, the discharge pipe 8, the fuel hose 9, etc.

Therefore, even if a fire occurs in the refueling service area or the building 25 is destroyed due to the occurrence of an earthquake, as in the embodiment described above, only air will be discharged from the discharge pipe 8 instead of the oil 7a, resulting in a large fire accident. This will not lead to an explosion or other accident.

Incidentally, in both of the above embodiments, 7a is not limited to oil liquid, but may be any other dangerous fluid, and 7 is a liquid storage tank that communicates with a loading arm device for tank truck shipping, and when an earthquake of a predetermined seismic intensity occurs, the loading A configuration may also be adopted in which nonflammable gas such as air in the tank is discharged into the liquid supply piping of the arm device.

In addition, although a falling ball type seismic intensity meter was used, other types of seismic intensity meters may be used as long as they have means for detecting vibrations caused by earthquakes or vehicle collisions, and emit signals based on the set seismic intensity k. In addition, 13 may be used instead of a seismic intensity meter as a fire occurrence detector that detects smoke, flames, abnormal temperatures, etc. in the gas station, and these detectors detect various things associated with fire outbreaks such as smoke, flames, and high temperatures. When the phenomenon is detected, the electromagnetic on-off valve 11, which has been opened automatically from the outside, is closed, and the electromagnetic on-off valve 12, which has been closed, is opened, and the air in the underground tank 7 is discharged into the discharge pipe 8. It may also be configured to prevent the occurrence of a fire.

In this case, the limit switch of the fire occurrence detector may have one contact point for each object to be detected, and 14 is not used as a seismic intensity indicator, but instead serves as a fire alarm that issues an alarm based on the detection signal from the fire occurrence detector.

Further, in an appropriate emergency, the electromagnetic on-off valve 11 may be closed and the electromagnetic on-off valve 12 may be opened by an external signal manually transmitted from the outside.

Further, instead of using electromagnetic on-off valves 11 and 12, other valve means such as an electromagnetic pilot type pneumatic on-off valve may be used.

Furthermore, the underground tank 7 may be filled with not only air 7b but also a non-flammable gas, such as CO2 gas, which has a higher specific gravity than air.

As described above, since the liquid supply device of the present invention is constructed as described above, the fuel supply piping is not damaged due to an unexpected disaster such as an earthquake or a collision of a vehicle while refueling, for example in a gas supply system at a gas station. Even in the event of a failure, a manual or automatic signal can be sent remotely from the outside to release non-flammable gas such as air from the damaged part, causing oil liquid to be released outside the fuel metering machine and cause it to catch fire. This is impossible, and it has the advantage of being able to prevent the oil in the liquid tank from catching fire and causing a major fire or explosion.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an embodiment of the liquid supply device of the present invention;
The figure is a longitudinal cross-sectional view of the main part of an example of the seismic intensity meter, FIG. 3 is a circuit system diagram of one embodiment of the relay circuit, and FIG. 4 is a schematic configuration diagram of another embodiment of the liquid supply device of the present invention. . 1... Fuel metering machine, 2... Fuel pump, 7... Underground tank, 7a... Oil liquid,
7b... Air, 10... Branch piping, 1
1, 12... Solenoid on-off valve, 13... Falling sphere seismic intensity meter, 20... Relay unit.

Claims (1)

[Claims] 1 A liquid tank for storing a flammable liquid in the presence of a flame-retardant gas, and a liquid supply line whose end communicates with the flammable liquid in the liquid tank and supplies the flammable liquid to the outside of the liquid tank. , a branch line whose one end communicates with the flame-retardant gas in the liquid tank and whose other end is connected to the middle of the liquid supply line, and a position between the connection part of the liquid supply line between the liquid tank and the branch line; A first on-off valve is provided in the branch line and is opened during liquid supply, and a second on-off valve is provided in the middle of the branch line and is closed during liquid supply. a detection means for supplying the flame-retardant gas to the outside of the liquid tank in place of the flammable liquid by outputting an output and switchingly closing the first on-off valve and switchingly opening the second on-off valve; A liquid supply device comprising: