JPH0315520Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a piping structure for pumping out a tank.

(b) Prior art Conventionally, for example, at a gas station,
Some tanks were equipped with multiple tanks, each with a pumping device, so that gasoline could be pumped out from any tank, making it possible to refuel multiple vehicles at the same time.

In addition, the amount of gasoline injected into the tank and the amount pumped out are integrated, and when the amount of gasoline stored in the tank currently being pumped becomes less than a certain amount, the pumping device is automatically switched to another tank, and each tank is By pumping gasoline on average from
Some systems are designed to prevent problems such as running out of gasoline due to pumping only from a specific tank.

(c) Problems that the invention aims to solve However, while refueling can be done from any tank, making the task more convenient, due to installation locations, some pumping devices are used more frequently and others are less frequently used. There was a drawback that the tank of the equipment used frequently was consumed quickly and became unusable.

In addition, in systems where the pumping device automatically switches to another tank, the amount of stored gasoline is calculated by adding up the amount of gasoline injected and the amount pumped out, so errors accumulate and it is not possible to accurately The disadvantage is that connection switching is not performed.

(d) Means for solving the problem In this invention, a plurality of tanks are connected to a pumping device through pumping piping,
The middle part of the pipe is connected to each other through a communication pipe, a three-way valve is interposed at the connection part with the pipe, and the three-way valve is controlled by a liquid level sensor and a control device installed in the tank. In addition, the controller inputs the liquid level detection signal from the liquid level sensor to the comparator, and if the liquid level in the tank is lower than a preset height in the comparator, the control device inputs the liquid level detection signal from the liquid level sensor to the control relay. closes the contact and activates the output relay connected to the solenoid, switches the flow path of the three-way valve to connect the other tank to the desired pumping device, and also ensures that the liquid level in the tank is higher than the preset height. If so, the contact connected to the control relay is closed, activating the output relay connected to the solenoid, and the solenoid is reversely activated, so that the three-way valve connection is configured to communicate with the base tank and the required pumping device. The purpose of the present invention is to provide a pumping control device for a tank.

(E) Function/Effect According to this invention, when the contents of the tank connected to the frequently used pumping device are consumed and the liquid level drops, the control device outputs a signal from the liquid level sensor, and the three-way valve By switching the communication route and making it possible to draw from another tank, refueling of vehicles etc. can be performed regardless of the remaining amount in the same tank, which has the effect of improving the efficiency of this work. .

In other words, the liquid level detection signal from the liquid level sensor is input to the comparator, and if the liquid level in the tank is lower than the height preset in the comparator, the contact connected to the control relay is closed and the solenoid is activated. Activate the connected output relay, switch the flow path of the three-way valve to connect the other tank to the required pumping device, and
If the liquid level in the tank is higher than the preset height, the contacts leading to the control relay are closed, the output relay leading to the solenoid is actuated, and the solenoid is reversed to reconnect the three-way valve. By communicating the tank with the required pumping device, it is possible to pump gasoline from each tank on average, thereby preventing problems such as running out of gasoline due to pumping only from a specific tank.

As mentioned above, by directly detecting the level of liquid such as oil actually stored in the tank with a liquid level sensor, and comparing the liquid level with a preset height using a comparator, the accumulation of errors can be avoided. It is possible to accurately switch the connection between the pumping device and the tank.

Furthermore, by changing the height set in the comparator, the timing of connection switching can be easily changed depending on the situation.

In addition, multiple pumping devices can be used at the same time to supply liquid to multiple destinations at the same time, and by using a three-way valve to switch the communication state,
Only one valve simplifies the piping structure, requires only one valve drive mechanism, and also simplifies the output section of the control device, making it easier to install a liquid level sensor in the tank that is used most frequently. For example, it is possible to quickly detect the loss of liquid stored in all tanks.
This has the effect that measures such as liquid replenishment can be taken without missing an opportunity.

(F) Embodiment The embodiment of this invention will be described in detail based on the drawings. FIG. 1 schematically shows a gas station, in which a plurality of tanks 1-1, 1-2 are buried,
Pumping devices 2-1 and 2-2 are installed above each tank 1-1 and 1-2, respectively, and each tank 1-
1, 1-2 lower part and each pumping device 2-1, 2-2
The pipes 3-1 and 3-2 are connected to each other through pumping pipes 3-1 and 3-2. An electric explosion-proof electromagnetically operated three-way valve 5 is interposed at the connection between the pipe and the communication pipe 4.

In addition, a liquid level sensor 6 is installed in the frequently used tank 1-1, and the sensor 6 is connected to a float 7 that moves up and down following the gasoline liquid level in the tank 1-1, and It is comprised of a transmitting section 9 that converts the vertical movement of 7 into an electrical signal and outputs it to a control device 8.

FIG. 2 shows a three-way valve 5, in which a substantially T-shaped flow path 1 is provided inside a valve shell 10 with a valve port opened in three directions.
1 is rotatably housed in a rotary valve body 12 having a hole therein;
The valve body 12 and a solenoid 13 disposed on the outside of the valve shell 10 are interlocked and connected, and the flow path of the valve 5 is switched by the forward and reverse rotation of the solenoid 13, so that the tank 1-1 is The communication destination of the pumping device 2-1 that was communicating is switched to another tank 1-2, so that the gasoline in the same tank 1-2 can be refueled to the axle etc. via the pumping device 2-1. .

3 and 4 show the control device 8, which inputs the electric signal from the liquid level sensor 6 to the comparator 14,
The comparator 14 detects the liquid level in the tank 1-1, and when the liquid level becomes lower than the height preset in the comparator 14, the contact 15 is closed and the output relay 17 is connected via the control relay 16. is activated to normally operate the solenoid 13 to communicate the pumping device 2-1 with the communication pipe 4. When the liquid level in the tank 1-1 becomes higher than the set height, the contact 18 is closed and the output is output via the control relay 19. By activating the relay 20 and causing the solenoid 13 to perform reverse operation, the pumping device 2-1
It is configured to communicate with the pumping piping 3-1. Note that the contacts 16-1 and 19-1 are self-holding contacts operated by the control relays 16 and 19, respectively, and the contacts 21-1 and 21-2 are opened at the end of the forward and reverse operation of the solenoid 13, respectively. This is a contact for stopping the control output.

This invention is constructed as described above, and when there is a large amount of oil in the tank 1-1, which is frequently used, the pumping device 2-1 communicates with the tank 1-1.
Gasoline is pumped out from the tank 1-1 to refuel vehicles, etc., but when the oil level in the tank 1-1 decreases and the liquid level falls below the set height, the pumping device 2-1 and the tank are automatically pumped out. The other tank 1-2 and the device 2-1 are communicated with each other via the communication pipe 4, where the communication with the tank 1-1 was cut off, so that refueling can be continued. Further, when the liquid level in the tank 1-1 becomes higher than the set height after replenishing gasoline to the tank 1-1, the original communication state is automatically restored.

Although this embodiment describes two tanks, the same effects can be obtained with the same configuration as in this embodiment even when the number of tanks is three or more.

In addition to the operation shown in this embodiment, the three-way valve 5 may be operated by an electric motor or for explosion-proof measures.
It is also possible to connect the control device to an air source such as a compressor and arrange a solenoid valve for controlling the air in the device, so that the valves disposed near the tank and piping can be operated by pneumatic pressure. FIG. 5 shows another type of three-way valve, in which the flow passage 23 in the rotary valve body 22 is formed into a substantially L-shape.

In addition, what is shown in Fig. 6 is the pumping piping 2.
Electromagnetic valves 26 and 27 are respectively provided on the tank side and the pumping device side of the connection between 4 and the communication pipe 25, and by opening and closing the valves 26 and 27 alternately, the valve can be operated in the same way as a three-way valve. The control device 28 for this purpose is shown in FIG. 7 for switching the distribution route. In addition, 29 is a signal input terminal from a liquid level sensor, 30 is a comparator, 31,
32 is a control relay, 33 and 34 are solenoid valves 25 and 2.
No. 6 solenoid is shown.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a gas station in which the present invention has been implemented, Figure 2 is a schematic cross-sectional diagram of a three-way valve, Figures 3 and 4 are circuit diagrams of the control device, and Figures 5 to 7.
The figure shows another example. 1-1, 1-2: Tanta, 2-1, 2-2: Pumping device, 3-1, 3-2: Pumping piping,
4: Communication pipe, 5: Three-way valve, 6: Liquid level sensor,
8: Control device.

Claims (1)

[Scope of utility model registration request] A plurality of tanks 1-1, 1-2 are connected to pumping devices 2-1, 2-2 via pumping piping 3-1, 3-2, respectively, and the same piping 3-1, 3
- 2 are connected to each other in the middle through a communication pipe 4, and a three-way valve 5 is interposed at the connecting part with the pipes 3-1 and 3-2, and the three-way valve 5 is connected to the tank 1- 1, the control device 8 inputs a liquid level detection signal from the liquid level sensor 6 to a comparator 14,
If the liquid level in the tank 1-1 is lower than the height preset in the comparator 14, the contact 15 connected to the control relay 16 is closed, the output relay 17 connected to the solenoid 13 is activated, and the three-way valve 5 is activated. Switch the flow path of the other tank 1-2 to the required pumping device 2-
1, and if the liquid level in tank 1-1 is higher than a preset height, control relay 1
9 is closed, the output relay 18 connected to the solenoid 13 is activated, and the solenoid 13 is reversely activated to connect the three-way valve 5 to the original tank 1-1 and the required pumping device 2. A tank pumping control device configured to communicate with -1.