JPS5912557B2 - Liquid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid supply device, in which the liquid supply direction of a liquid supply pump is reversed in response to an external signal to cause liquid in a discharge pipe to flow back into its storage tank. It is an object of the present invention to provide a liquid supply device having a structure capable of preventing liquid from being destroyed by strong vibrations, leaking liquid to the outside, and igniting it, resulting in a large fire, large explosion, etc.

Conventional refueling devices, such as ground-mounted or ceiling-hanging refueling devices at gas stations, supply hazardous fluids such as gasoline stored in underground tanks to fuel tanks of automobiles, etc. via refueling pumps. It is configured to be refueled.

However, this refueling system cannot be used in the event that an unexpected disaster such as an earthquake, fire, or explosion occurs during refueling, and the refueling worker evacuates to a safe evacuation site without stopping the drive of the top refueling pump. If a large amount of oil is released into the refueling service area and this oil ignites, there is a risk of a large fire or explosion, and even if the refueling pump is stopped at the same time as an earthquake occurs, If the main body or building of the fuel metering machine is destroyed by an earthquake and the oil in the fuel pump and its discharge piping leaks to the outside, this oil may ignite and cause a large fire or explosion as described above. However, it had drawbacks such as the risk of causing

The present invention eliminates the above-mentioned drawbacks, and an 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 essential parts of an example of the seismic intensity meter, and FIG. 3 shows a circuit system diagram of an example of the relay circuit.

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, for example, a rotary refueling pump 2, a motor 3 for driving the refueling pump 2, a flow meter 4, and a flow meter 4. a refueling amount counter 5 that integrates and displays the measured flow rate;
A relay unit 20 and the like, which will be described later, 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 7 in which oil liquid 7a is stored.

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 10 disposed at its tip.

11 and 12 are solenoid valves, which are connected to the suction pipe 6 of the oil supply pump 2, respectively.
and disposed in the discharge pipe 8.

The solenoid valve 11 opens when its solenoid 11a is energized, and the solenoid valve 12 closes when its solenoid 12a is energized to cut off communication between the discharge pipe 8 and the outside air, and opens when it is de-energized. The discharge pipe 8 is communicated with the outside air.

Reference numeral 13 denotes a spherical falling type vibration needle, which is placed and fixed on the ground near the refueling meter 1, and has a vibration sensing part 13-m shown in Fig. 2 inside it.
For example, n pieces (13-1 to l3-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, reference numeral 15 is a sphere, and a part of its surface is normally supported by contacting the sphere contact surface 16a of the sphere support member 160.

Reference numeral 17 denotes a recording/receiving member surrounded by a side wall 17a and having an inclined bottom surface, and a hemispherical recess 17b into which the sphere 15 fits is bored at 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.

Further, the diameter d of the sphere abutting surface 16a of the sphere support member 16 is different among 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 valley 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.
-1 to 13-n are connected in series to normally closed contacts 18-1 to 18-m of limit switches 18, respectively.

Further, rl-1 to rn-1 are normally open contacts of relays R1 to Rn, respectively, and are connected to the seismic intensity display 14 to digitally display the maximum seismic intensity of the earthquake.

Reference numeral 21 denotes a nozzle switch, which is opened and closed in connection with the operation of attaching and detaching the refueling nozzle 10 to and from the nozzle hook 10a.

rk-2 to rk-5 are the contacts of the relay Rk corresponding to the set seismic intensity k among the relays R0 to Rn, and the normally closed contacts rk2,
The normally open contacts rk 3 are connected in series with each solenoid 11a, 12a of the solenoid valve 11.12, respectively, and the normally open contacts r
K4 is connected in series to the normal rotation circuit of the motor 3, and the normally closed contact rk-5 is connected to the reverse rotation circuit of the motor 3, respectively.

Rp is a relay connected in series with the nozzle switch 21 and the solenoid 11a and in parallel with the contact rk-2, and its normally open contact rp-1 is connected in series with the normal rotation circuit of the motor 3.

Note that the set seismic intensity is set to the minimum seismic intensity or a value smaller than the minimum seismic intensity such that the refueling meter 1 will be destroyed if an earthquake with a higher seismic 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 18-0 to 18-n are closed.

Therefore, the coils of relays R0 to Rn are energized, and relay Rk
The normally open contacts rk-3srlc4 are closed by the excitation of the normally closed contacts rk-2. rk Tsukasa is developing.

As a result, the solenoid 12a of the solenoid valve 12 is energized and the solenoid valve 12 is closed, while the solenoid valve 11 is operated by removing the refueling nozzle 10 from the nozzle hook 10a and switching the solenoid 12a to the switch 2.
When motor 1 is closed, it is energized and the valve is opened, and motor 3 also closes switch 21 to open normally open contacts r p
-1 is closed, normal rotation is started.

Now, in order to refuel the fuel tank of a vehicle such as an automobile, the refueling nozzle 10 is removed from the nozzle hook 10a of the refueling meter 1, and when the nozzle switch 21 is closed in connection with this removal operation, the relay R is energized and the Normally open contact r, -1
is closed and the motor 3 is started to rotate forward, and the solenoid valve 1 is closed.
1, the solenoid 11a is energized and opened.

Next, when the refueling nozzle 10 is inserted into the fuel tank and the valve is opened manually, the oil liquid 7a in the underground tank T flows through the suction pipe 6, the solenoid valve 11, the pump 2, the flow meter 4, and the refueling hose 9.
, the fuel tank is supplied with fuel via the fuel nozzle 10.

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 that an earthquake occurs during refueling and the seismic intensity meter 13 detects a set seismic intensity k.

At this time, n seismic sensing parts 13-1 to 13- of the seismic intensity meter 13
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 R0 to Rk are demagnetized and their normally open contacts r l l to rlc l grlc-3srk 4
is opened and the normally closed contact rlc-2srk 5 is closed, so the motor 3 is started in reverse, and
The solenoid 12a is demagnetized and the solenoid valve 12 opens.

As a result, the oil supply pump 2 is rotated in the opposite direction to the normal oil supply direction, so that the oil liquid 7a discharged into the discharge pipe 12 at the time of an earthquake flows back into the suction pipe 6 and is completely contained in the underground tank T. is refluxed to.

Therefore, if an earthquake of a predetermined seismic intensity occurs during refueling, the refueling pump 2 is driven in reverse at the same time as the earthquake occurs, and all the oil 7a in the discharge pipe 8 is returned to the underground tank 7, so that the refueling meter 1 Even if it is destroyed by an earthquake, there is no risk that the oil liquid 7a will leak outward from the destroyed area and ignite, causing a fire or an explosion.

In addition, if a landmine with a seismic intensity higher than or equal to the seismic intensity occurs when refueling is not being performed, that is, when the switch 21 is open and the solenoid valve 11 is closed, the seismic intensity meter 13 operates to detect a normally closed single point r k-. Since the 2t rlc-5 is closed, the solenoid S1a is energized and the solenoid valve 11 is opened, and the motor 3 is driven in the reverse direction.

As a result, as in the case where an earthquake occurs during refueling, the oil 7 that had accumulated between the solenoid valve 11 and the refueling nozzle 10
a is returned to the underground tank 7.

Therefore, if the refueling meter 1 that is not refueled is destroyed by an earthquake, there is a risk that the oil 7a will leak outside from the destroyed part and ignite, causing a fire or an explosion. There isn't.

As mentioned above, regardless of whether or not refueling is in progress, the refueling pump 2 is driven in reverse at the same time as an earthquake of a predetermined seismic intensity or higher occurs, and the oil liquid in the discharge pipe 8 and the refueling hose 9 is returned to the underground tank T. Since the electromagnetic on-off valve 12 opens at the same time as an earthquake occurs, the pump 2 does not become evacuated even if the oil supply nozzle 10 is closed, and therefore the oil liquid 7a is quickly returned to the underground tank T. Ru.

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.

Incidentally, when the seismic intensity m of the earthquake is less than the set seismic intensity, the seismic sensing parts 13-1 to 13-(k-1) operate corresponding to the seismic intensity m.
) Normally closed contacts 18-1 to 18 of each limit switch 18
- (k-1) is opened, but the normally closed contact 18- of each limit switch 18 of ~13-n is opened at the seismic sensing part 13-, which is opened at a seismic intensity higher than the set seismic intensity. do not.

Therefore, the relays Rk-Rn are not demagnetized, so the normally closed contacts rlc-2 and rlc-5 are not closed, and the normally open contacts r
Since k-3゜rk 4 is not opened, the motor 3 is in a state where it can start normal rotation by removing the refueling nozzle 10 from the nozzle hook 110a and closing the switch 21, and the seismic intensity m at that time is simply displayed on the seismic intensity display 14. displayed to notify customers and others to avoid confusion.

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

FIG. 4 shows a schematic diagram of another embodiment of the liquid supply device of the present invention.

In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and their explanation will be omitted.

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

A delivery unit 23 is disposed on the ceiling of the building 24, and the refueling hose 9 is wound and stored inside the delivery unit.

The refueling hose 9 is a discharge pipe 8 arranged inside the building 24.
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.

Similarly to the above-mentioned embodiment, when an earthquake occurs that exceeds the set seismic intensity, the oil 7a discharged into the discharge pipe 8 flows back into the underground tank 7, and therefore even if the building 24 collapses due to strong earthquakes, The oil liquid 7a will not leak into the refueling service area, and therefore there is no danger of a major fire, major explosion, or the like.

In both of the above embodiments, 7a is not limited to oil liquid, but may be any other dangerous fluid, and 7a is a liquid storage tank that communicates with a loading arm device for tank lorry shipping. It may be configured such that the liquid supply pump is reversed so that the liquid discharged into the discharge piping of the loading arm is returned to the liquid storage tank.

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. It may also be configured such that the phenomenon is detected and the oil supply pump 2 is automatically driven in reverse from the outside to cause the oil 7a discharged into the discharge pipe 8 to flow back into the underground tank 7.

In this case, the limit switch contact point of the fire occurrence detector shall be one for each detection target (14 is not used as a seismic intensity indicator, but instead is used as a fire alarm that issues an alarm based on the detection signal from the fire occurrence detector). .

Furthermore, the fuel pump 2 may be configured to be driven in reverse by an external signal manually transmitted from the outside in an appropriate emergency.

Furthermore, the oil supply pump 2 is not limited to a rotary type (for example, it may be a plunger type double-acting pump, as long as the direction of liquid supply can be reversed by an external signal).

Alternatively, two oil supply pumps 2 may be arranged in parallel and their respective liquid feeding directions may be different from each other, and one may be used for refueling and the other for backflow.

Furthermore, in both of the above embodiments, the normally closed contact rk2 is not used,
Alternatively, the normally open contact rk-4 of the relay Rk may be connected in series with the relay R9, and the refueling pump 2 may be driven in reverse by an earthquake having a set seismic intensity only during refueling.

In addition, the electromagnetic on-off valves 11 and 12 are configured to close and open when energized, and these on-off valves are normally de-energized and energized from outside in the event of an emergency such as an earthquake. In this case, the power consumed by both on-off valves can be saved compared to the case of the above embodiment.

As described above, the liquid supply device of the present invention is provided with a liquid supply direction control means for reversing the liquid supply direction of the liquid supply pump, and the liquid supply direction control means is controlled by the output of the detection means that detects an emergency situation and outputs a signal. The structure is such that the liquid in the discharge pipe flows back into the suction pipe by activating the pump, so it can be used, for example, in a ground-mounted or ceiling-suspended type where the refueling worker drives the refueling pump to refuel the fuel tank of a car, etc. At gas station refueling systems, etc., when an earthquake occurs, a refueling worker evacuates to a safe evacuation site without stopping the refueling pump, or refueling even though the refueling pump has been stopped. Even if the equipment is destroyed and the discharge piping inside the oil supply system is damaged, the detection means detects the occurrence of the earthquake and the output from this activates the liquid supply direction control means, which reverses the liquid supply pump and prevents the discharge. Since the oil in the piping is reversed and returned to a safe storage area such as an underground tank, no oil remains in the oil supply system, and this prevents oil from leaking into the service area from the damaged part. It has the advantage of being able to prevent this from igniting, resulting in a large fire, large explosion, etc.

[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...Refueling metering machine, 2...Refueling pump, 6...Suction piping, 8...Discharge piping,
11, 12... Solenoid on/off valve, 11a, 12a.
... Solenoid, 13 ... Seismic intensity meter, 20
...Relay unit, 22...Refueling metering unit.

Claims (1)

[Claims] 1. A liquid supply direction control means is provided to reverse the liquid supply direction of the liquid supply pump, and the liquid supply direction control means is actuated by the output of a detection means that detects an emergency situation and outputs a signal to control the liquid in the discharge piping. A liquid supply device characterized in that the liquid is configured to flow back to the suction piping side.