JP2000053200A - Overflow preventing system in underground tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent over-flow of an underground tank when petroleum product at an oil supplying station is unloaded and attain a safety state at a service station. SOLUTION: There is provided an oil feeding system in which petroleum product within a hatch section of a tank truck receiving product is supplied to an underground tank of an oil supplying station for every kind of oil. An optical sensor 33 for outputting light toward an oil surface in the underground tank and outputting a sensing signal corresponding to a reflected optical amount accompanied with an output of light is arranged for every underground tank. A sensed signal from the optical sensor 33 is inputted, oil is supplied and it is judged whether or not an amount of oil within the underground tank of a target is of full state. The oil supplying station is provided with a sub-controller 45 for use in instructing an oil supplying with a detected signal from the optical sensor 33 being applied as an input, discriminating whether or not an amount of oil within the underground tank is of full of oil and when the amount of oil is full in the tank, it may output a signal indicating this state by a wireless operation. The tank truck vehicle is provided with a main controller 20 for controlling to stop supplying of oil from a hatch section in respect to the underground tank corresponding to the received signal when a signal indicating that an amount of oil in the underground tank is full is received by the sub-controller 45.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank truck for supplying and receiving various petroleum products to a tank, transporting the received petroleum products to a gas station, and storing the petroleum products contained in the tank in an underground tank. TECHNICAL FIELD The present invention relates to an underground tank overflow prevention system for preventing an underground tank from overflowing during unloading in an oil delivery system for unloading.

[0002]

2. Description of the Related Art Generally, in order to carry petroleum products such as gasoline into a tank of a gas station, oil is supplied to each hatch of a tank truck for each type of oil at an oil depot and received. The transported petroleum products are transported to gas stations, and the petroleum products in each hatch are unloaded to underground tanks at the gas stations by oil type. At the time of this unloading, an unloading hose is connected between the discharge port of the tank truck of the tank truck and the refueling port of the gas station, and the petroleum products are supplied in hatch units through the refueling port to the underground tank of the gas station Are refueled by oil type.

[0003] By the way, petroleum products handled at a gas station include a plurality of types such as high octane gasoline (hereinafter referred to as high volatility gasoline), regular gasoline (hereinafter referred to as general gasoline), light oil, and kerosene. Are stored in underground tanks for each oil type. Similarly, the tank truck has a hatch portion for each oil type.

[0004] Therefore, when unloading and transporting various petroleum products from a tank truck to an underground tank of a gas station, it is necessary to confirm that the oil types are not different from each other. Also, in order to handle petroleum products that are strictly prohibited from fire, during unloading of petroleum products from the tank truck to the underground tank, always monitor the oil in the underground tank so that the oil does not overflow and the oil overflows from the underground tank. I had to be careful.

FIG. 7 is a schematic view of a conventional device for preventing oil mixture and oil leakage in an underground tank disclosed in Japanese Patent Application Laid-Open No. 3-226499, and FIG. 8 is a block diagram showing the structure of the device.

The underground tank oil mixing and oil leakage prevention device shown in FIGS. 7 and 8 is an oil amount sensor 5 for measuring an oil amount in each of a plurality of underground tanks 51 buried in a gas station.
2 is attached. The oil amount measured by each oil amount sensor 52 is converted into an electric signal by an electric signal conversion device 53, and then sent to an oil amount display device 55 via an electric signal line 54. The oil amount display device 55 includes a lock switch 56 that is turned on when the display of the oil amount is locked, and an automatic unlocking device 57 that automatically unlocks the lock when 3 to 5 minutes elapse after locking by the lock switch 56.
Is provided in the power supply unit. An alarm circuit 59 is connected to the display lock device 58, and a buzzer 60 is connected to the alarm circuit 59.

Then, an underground tank to be refueled (for example, 5
1A) Underground tanks other than 51 (eg, 51B, 51C)
By turning on the lock switch 56, the display lock device 58 is operated to lock the display of the oil amount, the oil level at the time of locking is memorized and fixed, and a new electric signal indicating the change in the oil level is output. Thus, the fixed storage signal is compared and operated, and the alarm circuit 59 is operated to alert the buzzer 6 to warn that the oil level has changed.
0 sounds.

As described above, in the above-described apparatus for preventing oil mixture and oil leakage in the underground tank, when it is desired to refuel a specific tank in the underground tank 51 from a tank truck, all of the lock switches 56 of the other underground tanks are turned on in advance, The display lock device 58 is locked. If the tank other than the desired underground tank is erroneously refueled in this state, the oil level changes, and the alarm circuit 59 is activated to issue an alarm. Thereby, erroneous refueling can be detected.

[0009]

However, in the conventional apparatus shown in FIGS. 7 and 8, an alarm can be issued when a difference occurs between the previous oil amount and the current oil amount. When a refueling order is given to an underground tank to be refueled,
The display of the amount of oil in the underground tank is cancelled, and no alarm is issued even if the amount of oil fluctuates, so during refueling the underground tank to be refueled, always keep the oil in the tank from overflowing and overflowing. The problem of having to monitor was not solved.

In order to solve the above-mentioned problems, the present invention provides an underground tank overflow prevention system capable of reliably preventing underflow of an underground tank when unloading petroleum products at a gas station and achieving safety. It is intended to provide.

[0011]

Means for achieving the above object will be described with reference to the drawings corresponding to the embodiments. According to the first aspect of the present invention, the petroleum products stored in the oil depot 2 are refueled to the hatch portion 8 of the tank truck 3 by oil type and received, and the received petroleum products in the hatch portion 8 are refueled for each oil type. In the oil feed system 1 for refueling and unloading the underground tank 15 in the place 5, the oil level is provided for each underground tank 15, detects the oil level in the underground tank 15, and detects a signal corresponding to the oil level. And an oil level gauge which is provided at the gas station 5 and outputs a detection signal from the oil level gauge as an input to determine whether or not the amount of oil in the underground tank 15 to be unloaded is full. A sub-controller 45 that wirelessly outputs a signal indicating that the amount is full when it is determined to be full; Is received when a signal indicating that Underground tank 15 corresponding to the signal
And a main controller 20 for stopping and controlling the refueling from the hatch portion 8 for the vehicle.

According to a second aspect of the present invention, the petroleum products stored in the oil depot 2 are refueled to the hatch portion 8 of the tank truck 3 by oil type and received, and the received petroleum products in the hatch portion 8 are classified by oil type. In the oil feed system 1 for refueling and unloading the underground tank 15 of the gas station 5 every time, the underground tank 15
An oil level gauge that is provided for each of the tanks and detects an oil level position in the underground tank 15 and outputs a detection signal corresponding to the oil level position; It is determined whether or not the oil amount in the underground tank 15 to be unloaded is full with the signal as an input, and it is determined that the oil amount is full,
And a sub-controller 45 that wirelessly outputs a response signal indicating that the oil level is full when a call signal is received, and a sub-controller 45 that is provided in the tank lorry 3 and is provided to the sub-controller 45 at predetermined intervals. A main control for outputting a paging signal wirelessly and, when a response signal to the paging signal is received from the sub-controller 45, stopping control of refueling from the hatch portion 8 to the underground tank 15 corresponding to the received response signal. Device 20 is provided.

According to a third aspect of the present invention, the petroleum products stored in the oil depot 2 are refueled to the hatch 8 of the tank lorry 3 according to the type of oil, received and received, and the received petroleum products in the hatch 8 are classified by oil type. In the oil feed system 1 for refueling and unloading the underground tank 15 of the gas station 5 every time, the underground tank 15
An optical sensor 33 that is provided for each of the fuel tanks 5 and emits light toward the oil surface in the underground tank 15 and outputs a detection signal corresponding to the amount of reflected light accompanying the emission of the light;
Using the detection signal from the optical sensor 33 as an input, it is determined whether or not the oil amount in the underground tank 15 to be unloaded is full, and when it is determined that the oil amount is full, a signal indicating this is wirelessly transmitted. And a sub-controller 45 that is provided in the tank truck 3 and outputs the underground tank 1 from the sub-controller 45.
When a signal indicating that the oil amount in 5 is full is received,
A main controller 20 for stopping and controlling refueling of the underground tank 15 corresponding to the received signal from the hatch portion 8 is provided.

According to a fourth aspect of the present invention, the petroleum products stored in the oil depot 2 are refueled to the hatch portion 8 of the tank truck 3 by oil type and received, and the received petroleum products in the hatch portion 8 are classified by oil type. In the oil feed system 1 for refueling and unloading the underground tank 15 of the gas station 5 every time, the underground tank 15
An optical sensor 33 that is provided for each of the fuel tanks 5 and emits light toward the oil surface in the underground tank 15 and outputs a detection signal corresponding to the amount of reflected light accompanying the emission of the light;
The detection signal from the optical sensor 33 is used as an input to determine whether or not the oil amount in the underground tank 15 to be unloaded is full, and when it is determined that the oil amount is full, and a call signal is received. A sub-controller 45 that wirelessly outputs a response signal indicating that the oil level is full, and a sub-controller 45 that is provided in the tank truck 3 and that wirelessly outputs a call signal to the sub-controller 45 at a predetermined cycle; And a main controller (20) for stopping the refueling from the hatch (8) to the underground tank (15) corresponding to the received response signal when receiving a response signal from the sub-controller (45) for the call signal. Features.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram of an oil feed system to which an underground tank overflow prevention system according to the present invention is applied, and FIG. 2 is a schematic view of a tank truck applied to the oil feed system of FIG. FIG. 3 is a view showing a state in which petroleum products are being unloaded to an underground tank of a gas station, FIG. 3 is a configuration diagram of an optical sensor provided for each underground tank of the gas station, and FIG. 4 is provided in the tank truck of FIG. FIG. 5 is a block diagram showing a main controller and a sub controller provided at a gas station, FIG. 5 is an external view of the main controller shown in FIG. 4, and FIG. 6 is a block diagram showing an internal configuration of the main controller shown in FIG.

The oil feed system 1 according to the present embodiment supplies various petroleum products stored in the oil tank station 2 to the tank unit 4 of the tank truck 3 for each type of oil and receives the oil. Is driven to the gas station 5 to be conveyed, and the received petroleum products in the tank unit 4 are unloaded to the underground tank 15 of the gas station 5 for each oil type.

In the oil tank station 2, petroleum products to be transported are stored in tanks (not shown) for each type (eg, regular gasoline, high octane gasoline, light oil, kerosene, etc.). Each tank has a loading and
A hose 6 (6a to 6d) attached to the arm is provided. The hose 6 is connected to a hatch portion 8 of the tank truck 3 to be described later, and supplies the oil product stored in the tank to the hatch portion 8.

The loading arm has a hose 6
A type indicating means 7 (7a to 7d) indicating the type of petroleum product stored in the tank to which is connected is provided for each hose 6. For example, the type indicating means 7 can be constituted by a key in which a different key groove is formed for each type of petroleum product. Then, the key 7 as the type indicating means is suspended from a loading arm of a tank in which a corresponding type of petroleum product is stored.

As shown in FIG. 2, the tank section 4 of the tank truck 3 has a type of petroleum product (regular gasoline,
Depending on the high octane gasoline, light oil, kerosene, etc., any one of the petroleum products is in a predetermined unit amount (for example, 1K1, 2K1,
4K1) It is composed of a plurality of hatch portions 8 to be loaded. In the example of FIG. 2, the tank portion 4 is constituted by seven hatch portions 8a to 8g.

On the bottom surface of each hatch portion 8, an air type hatch bottom valve 9 (9a to 9g) driven by air from an air tank for opening and closing a solenoid valve for taking out stored petroleum products is provided. Each is provided. These hatch bottom valves 9 are connected to a discharge port 11 through a common piping section 10.
Is connected to

More specifically, in the example of FIG.
The first to fourth hatch portions 8a to 8 viewed from the side a.
The hatch bottom valves 9a to 9d of d are connected to the first common piping portion 10a, and the hatch bottom valves 9e to 9g of the fifth to seventh hatch portions 8e to 8g are connected to the second common piping portion 10b. . Further, the first and second common piping sections 10a, 10b
Is connected to a third common piping section 10c having discharge ports 11a and 11b at both ends and an intermediate gate valve 12 mounted at the center.

The discharge port 11 has a handle that is manually opened when unloading the petroleum products stored in the hatch portion 8. Like the hatch bottom valve 9, the discharge port 11 is driven by, for example, air from an air tank accompanying opening and closing of a solenoid valve, and the handle is locked in a normal state.

A key box 13 is provided at a predetermined position (for example, a ceiling portion) of each hatch portion 8. Each of the key boxes 13 accommodates a card-shaped transport-side oil type key 14. The transport-side oil type keys 14 are provided in the same number as the types of the stored petroleum products. In the example of FIG. 1, there are four types of petroleum products: regular gasoline, high octane gasoline, light oil, and kerosene, so four transport-side oil type keys 14 a to 14 d are provided in the key box 13 for each hatch portion 8.
It will be stored in.

The transport-side oil type key 14 has position information of the hatch 8 (for example, the driver's seat 3a of the tank truck 3).
(Indicating the number of the hatch portion 8 in the key box 13 as viewed from above) and information indicating the type of petroleum product stored in the corresponding hatch portion 8. Such information is provided, for example, as magnetic information.

More specifically, a magnet 30 having a north pole and a south pole
And a plurality of magnets 30 are arranged on the transport-side oil type key 23 so as to face individual hole ICs constituting the transport-side key information detecting means 23 when a key is inserted into an insertion port 28a described later. . For example, when there are four types of petroleum products and the number of hatch portions 8 is 7, the position information of the hatch portion 8 and the information stored in the hatch portion 8 are obtained by combining the N pole and the S pole of five magnets. Information indicating the type of petroleum product is provided, and these magnets are arranged facing the Hall IC. When a key is inserted into the insertion port 28a, which will be described later, the magnet 31 is disposed on the transport-side oil type key 23 so as to face one of the reed switches constituting the transport-side key information detecting means 23a. The Hall IC facing the magnet 30 converts the magnetic force into an electric signal as a binary signal of “1” for the S pole and “0” for the N pole, for example, according to the magnetic force and the pole of the magnet, and is output from the plurality of Hall ICs. A binary signal is sent to the transport-side key information detecting means 23a by a combination of the signals "1" and "0".

The gas station 5 has an underground tank 15 for each type of petroleum product. In the example of FIG. 1, since there are four types of petroleum products: regular gasoline, high octane number gasoline, light oil, and kerosene, four underground tanks 15a to 15d are provided. Lubrication port 16 of each underground tank 15 (16a-
16d), a card-shaped storage-side oil type key 17 (17a to 17d) having the same shape as the above-described transport-side oil type key 14 is detachably attached. These storage-side oil type keys 17 have information indicating the types of petroleum products stored in the corresponding underground tank 15. The information indicating the type of the petroleum product is given as magnetic information as in the case of the transport-side oil type key 14 described above.

More specifically, a magnet 32 having a north pole and a south pole
Are combined, and a plurality of magnets 32 are arranged so as to face individual Hall ICs constituting the storage-side key information detecting means 23b when a key is inserted into an insertion port 28b described later. For example, if there are four types of stored petroleum products, 2
Position information of the hatch portion 8 is given by a combination of the N pole and the S pole of the magnets, and these magnets are arranged to face the Hall IC. The Hall IC corresponding to the magnet 32 sends to the storage-side key information detecting means 23b as a binary signal in which an electric signal composed of "1" and "0" generated by the magnetic force and the pole of the magnet is combined.

A baffle plate 18 as a restricting means is attached to a fuel supply port 16 of each underground tank 15. When the baffle plate 18 is manually released, the storage-side oil type key 17 closing the oil supply port 16 is disconnected from the oil supply port 16 so that the unloading hose 19 is not connected. When the removed storage-side oil type key 17 is inserted into the oil supply port 16, the baffle plate 18 returns to the original position, and the storage-side oil type key 17 is fixed to the oil supply port 16.

In this refueling station 5, one of the refueling ports 16 of the underground tank 15 provided for each type of petroleum product and the discharge port provided at the end of the common pipe 10 (10 c) of the tank truck 3. 11 (in FIG. 2, 11a) is connected by an unloading hose 19, and the handle (not shown) of the discharge port 11 is opened with the bottom valve 9 of the hatch portion 8 opened, so that the hatch is opened. Petroleum products led from the section 8 to the common piping section 10 are stored in the underground tank 15.

Each underground tank 15 is provided with an optical sensor 33 for detecting the amount of oil in the tank. Optical sensor 33
As shown in FIG. 3, one optical fiber core wire 34 is bent at the center, the tip of the bent portion is used as a detection portion 33a, and the bent portion is covered with a light-transmitting tube 35 such as polycarbonate. The detection section 33a is protected by further inserting a metal tube 36 made of stainless steel and surrounding the metal tube 36 excluding the detection section 33a with a tube 37 such as Teflon.
One of the two branches is a light input unit 33b into which light is incident, and the other is a light output unit 33c that outputs reflected light.

An optical sensor 33 is provided for each underground tank 15 with a detection unit 33a located at a full oil level in the tank. Light enters a light input unit 33b of the optical sensor 33 from a light source 46 of a sub-controller 45 described later. And
If the amount of oil in the underground tank 15 has not reached the full position and the detection unit 33a is not immersed in the oil level, the light sensor 33 emits light incident on the light input unit 33b from the detection unit 33a. There is almost no reflected light that is diffused to the surroundings and returns to the optical fiber core wire 34 via the detection unit 33a. On the other hand, when the oil amount in the underground tank 15 reaches the full tank position and the detection unit 33a of the optical sensor 33 is immersed in the oil level, the light incident on the light incident unit 33b is emitted from the detection unit 33a, The light is reflected by oil (oil surface) and returns to the optical fiber core wire 34 via the detection unit 33a. The reflected light accompanying the emission of the light is input to a light / electric conversion unit 47 of a sub-controller 45 described later via a light output unit 33c of the light sensor 33.

Next, the configurations of the main controller 20 and the sub-controller 45 used in the system of the present embodiment will be described with reference to FIGS.

The main controller 20 includes an operation switch 22 provided on an operation panel 21 of the housing shown in FIG. 5, a key information detecting means 23, a control means (CPU) 24, a driving means 25 shown in FIG. Display 26, display driving means 27, wireless device 4
The power supply (for example, 5 V) is obtained from the battery of the tank truck 3.

As shown in FIG. 5, the operation switch 22 is
A power switch 22a for supplying power and a start switch 22b for instructing start of unloading are provided.

The key information detecting means 23 is constituted by a card reader having two insertion ports 28 (28a, 28b) into which the transport-side oil type key 14 and the storage-side oil type key 17 shown in FIG. 5 are inserted.

As shown in FIG. 6, the key information detecting means 23
Has a transport-side key information detecting means 23a and a storage-side key information detecting means 23b. Transport side key information detecting means 2
3a is the transport-side oil type key 14 inserted into the insertion port 28a.
Hatch position information and information indicating the type of petroleum product are detected.

More specifically, in a state where the transport-side oil type key 14 is inserted into the insertion port 28a, a Hall IC is disposed so as to face the individual magnets that indicate the type of the petroleum product.
Further, the same number of reed switches as the hatch portions 8 are arranged at predetermined intervals in a direction orthogonal to the insertion direction of the transport-side oil type key 14.

Then, a magnet arranged on the transport-side oil type key 14 as hatch position information and a reed switch facing this magnet are numbered in advance, and the transport-side oil type key 14 is inserted into the insertion port 28a. At the time of insertion, hatch position information can be obtained by turning on the reed switch by the magnetic field of the magnet.

The storage-side key information detecting means 23b detects information indicating the type of petroleum product of the storage-side oil type key 17 inserted into the insertion opening 28b. Specifically, in a state where the storage-side oil type key 17 is inserted into the insertion opening 28b, the hole I is opposed to the individual magnets forming information indicating the type of the petroleum product.
C is provided.

The control means (CPU) 24 discriminates between the information indicating the type of petroleum product detected by the transport-side key information detection means 23a and the information indicating the type of petroleum product detected by the storage-side key information detection means 23b. The hatch bottom valve 9 is opened and closed, and the handle of the discharge port 11 is locked / released based on the comparison and matching result at that time, the reception information of the radio 49 and the hatch information detected by the transport-side key information detection means 23a. Is output to the driving means 25.

More specifically, in the control means 24, the radio 41 is transmitted from the radio 49 of the sub-controller 45 to the underground tank 15.
Does not receive a signal indicating that it is full, and as a result of comparison and collation,
When the information indicating both types of petroleum products match and the start switch 22b is pressed, a command to open the hatch bottom valve 9 of the hatch portion 8 indicated by the hatch information and a command to release the handle lock of the discharge port 11 are issued. Output to the driving means 25. At the same time, a control signal indicating that unloading is permitted is sent to the display driving means 2.
7 is output.

On the other hand, even if the start switch 22b is pressed, the radio 41 receives a signal indicating that the underground tank 15 is full from the radio 49 of the sub-controller 45, When the information indicating the type is determined to be inconsistent, a command to maintain the closed state of the hatch bottom valve 9 of each hatch portion 8 and a command to maintain the handle lock of the discharge port 11 are output to the driving unit 25.

The drive means 25 operates the hatch bottom valve 9 and the discharge port 11 of each hatch portion 8 based on a command from the control means 24. Specifically, when a command to open the hatch bottom valve 9 of the hatch portion 8 and a command to release the handle lock of the discharge port 11 are input from the control means 24, the hatch bottom valve 9 of the corresponding hatch portion 8 is automatically turned on. And the handle lock of the discharge port 11 is released.

On the other hand, the control means 24 sends the hatch 8
When a command to maintain the closed state of the hatch bottom valve 9 and a command to maintain the handle lock of the discharge port 11 are input,
The hatch bottom valve 9 of each hatch portion 8 is maintained in a closed state, and the handle lock of the discharge port 11 is maintained.

The display 26 is provided on the operation panel 21 and numbers, for example, from the driver's seat side of the tank lorry 3 which hatch 8 the transport-side oil type key 14 inserted through the insertion port 28a relates to. Hatch number display lamp 26a, which is displayed on the display, an unloading display lamp 26b which is lit when unloading is permitted, and a full tank display lamp 26c which is lit when the currently unloading underground tank 15 is full.
It has.

The display driving means 27 drives the hatch number display lamp 26a indicating the number of the corresponding hatch portion 8 based on the hatch information detected by the transport key information detecting means 21a. The display driving means 27 drives the unloading display lamp 26b to light when a control signal to permit unloading is input from the control means 24. Further, the display drive unit 27 drives the full tank display lamp 26c to light when the control unit 24 receives a control signal indicating that the amount of oil in the underground tank 15 currently unloaded is full. .

When a signal indicating that the underground tank 15 to be unloaded is transmitted from the wireless device 49 of the sub-controller 45 provided at the gas station 5 is received, the wireless device 41 receives the signal. The received signal is output to the control means 24.

The sub-controller 45 is provided on the fueling station 5 side (for example, office, management room, etc.), and comprises a light source 46, a light / electric conversion means 47, a control means (CPU) 48, and a radio 49. Be composed.

After the power is turned on, the light source 46 emits light of a predetermined wavelength to the light input section 33b of the optical sensor 33 of each underground tank 15 in accordance with a command from the control means 48.

The optical / electrical conversion means 47 is provided for each optical sensor 33.
The light output unit 33c is connected to the light output unit 33c via the detection unit 33a when light enters the light input unit 33b.
The signal is converted into an electric signal corresponding to the amount of the reflected light returning to c and output to the control means 48.

Control means (CPU) 48 receives a detection signal corresponding to the amount of reflected light from each optical / electrical conversion means 47, and determines whether or not the level of each detection signal exceeds a set level. It is determined whether or not the oil amount in the underground tank 15 is full. When it is determined that the oil amount is full, a signal indicating that the oil amount is full is transmitted from the wireless device 49.

Next, a series of operations of the system configured as described above will be described. Here, a case will be described as an example where high octane number gasoline (H) is supplied to the hatch portion 8b located second from the driver's seat side of the tank lorry 3 and unloaded at the gas station 5. In this operation,
The intermediate gate valve 12 of the common piping section 10c in FIG. 2 is kept open, and the discharge valve 11b on the left side is kept closed.

First, the key (type indicating means) 7 suspended on the loading arm of the tank storing high octane gasoline (H) is inserted into the key box 13 of the second hatch portion 8b of the tank truck 3. Insert into mouth 28a. As a result, the transport-side oil type key (2H) provided with the same information as the information indicating the type of the petroleum product of the inserted key 7 is removed from the key box 13. At this time, the transport-side oil type key (2H) removed is brought to the gas station 5.
Then, high octane gasoline is supplied to the second hatch portion 8b of the tank truck 3 via a hose 6a of a tank in which high octane gasoline (H) is stored. When this refueling work is completed, the tank truck 3 is driven and transported to the refueling station 5.

When the vehicle arrives at the gas station 5, the transport-side oil type key 14 a (2 H) brought is inserted into the insertion port 28 a of the main controller 20. Next, at the gas station 5, a fuel supply port 16a of an underground tank 15a for storing high-octane gasoline is stored.
Is manually released. Thereby, the storage-side oil type key 1 fixed to the oil supply port 16a of the underground tank 15a
7a (H) comes off, and the unloading hose 19 is connected to the refueling port 16a.
Can be connected at one end. Then, the storage-side oil type key 17a removed at this time is inserted into the insertion port 28b of the main controller 20.
And the power switch 22a is turned on. that time,
The other end of the unloading hose 19 is connected to the discharge port 11a.

In the control means 24 of the main controller 20, two oil type keys (a transport-side oil type key 14a and a storage-side oil type key 17a) are used.
a) is inserted into the insertion opening 28, the two oil type keys 14
a, 17a is compared with the information indicating the type of petroleum product, and if they match with the information indicating high octane gasoline,
The display driving means 27 is controlled to turn on the unloading display lamp 26b of the display 26. In this state, if the start switch 22b is pressed and the radio device 41 does not receive a signal indicating that the unloading target underground tank 15 is full from the radio device 49 of the sub-controller 45, the corresponding hatch portion 8b Hatch bottom valve 9b automatically opens. At the same time, the discharge port 11a
Is released, and the valve of the discharge port 11a can be manually opened. In this state, the discharge port 1
When the valve 1a is opened, an open hatch portion 8 of the hatch bottom valve 9b is opened.
The high octane gasoline is discharged from b through the common piping section 10 to the discharge port 11a, and is supplied to the underground tank 15a from the refueling port 16a via the unloading hose 19.

The control means 24 of the main controller 20
During the unloading, when the radio 41 receives a signal indicating that the unloading underground tank 15 is full from the radio 49 of the sub-controller 45, the hatch for the underground tank 15a corresponding to the received signal is received. The refueling from the unit 8b is stopped and controlled. That is, the hatch bottom valve 9b of the hatch portion 8b
Automatically closes.

As described above, in the above-described embodiment, when the oil quantity of the underground tank 15 to be unloaded becomes full during the unloading of the petroleum product to the underground tank 15 of the gas station 5, the hatch portion 8 Since the refueling of the underground tank 15 is automatically stopped, the overflow of the underground tank 15 can be reliably prevented and safety can be achieved without constantly monitoring the state of refueling of the petroleum product to the underground tank 15. .

At the time of refueling the hatch portion 8 at the oil depot 2, the transport-side oil type key 1 corresponding to the type of the petroleum product is used.
4 comes off the key box 13 of the corresponding hatch portion 8. Then, information indicating the type of the petroleum product of the removed transport-side oil type key 14 and the storage-side oil type key 17 removed from the oil supply port 16 of the underground tank 15 of the gas station 5
The information indicating the type of petroleum product is compared and compared. At that time, the opening and closing of the hatch bottom valve 9 is performed based on the reception information of the wireless device 49 and the hatch information detected by the transport-side key information detecting means 23a. The handle lock / release of the discharge port 11 is controlled.

Accordingly, in the petroleum products stored in each hatch portion 8, information indicating the type of the petroleum product of the transport-side oil type key 14 and information indicating the type of the petroleum product of the storage-side oil type key 17 are one. Only when the radio device 41 does not receive a signal indicating that the underground tank 15 is full from the radio device 49 of the sub-controller 45, it is unloaded to the underground tank 15 that stores the petroleum product. Oil products can be reliably prevented. Also, the oil type keys 14 and 17 to which different information is given are inserted into the insertion openings 28a and 28b, and the radio device 41 sends a signal indicating that the underground tank 15 is full from the radio device 49 of the sub-controller 45. Even if the start switch 22b is erroneously depressed in the received state, the hatch bottom valve 9 does not open and the discharge port 11 remains locked with the handle. Human errors can be prevented beforehand.

In the above embodiment, the sub-controller 45 provided on the side of the fueling station 5 receives the detection signal of the optical sensor 33 provided for each underground tank 15 as an input and fills the underground tank 15 with the oil level. Is transmitted from the radio 49, the main controller 20 provided on the tank lorry 3 side transmits the radio signal of the sub controller 45.
When a signal indicating that the amount of oil in the underground tank 15 is full is received from, the refueling from the hatch portion 8 to the underground tank 15 is controlled to be stopped, but the present invention is not limited to this configuration.

That is, the main controller 20 gives a command to the wireless device 41 from the control means 24 in a state where the unloading hose 19 is connected, and the sub-controller 45 issues a predetermined cycle from the wireless device 41 at a predetermined cycle. A paging signal is transmitted to the.
The sub-controller 45 receives the detection signal of the optical sensor 33 as an input, determines whether the oil amount in the underground tank 15 is full, determines that the oil amount is full, When a call signal is received from the machine 41, a response signal indicating that the oil amount is full is wirelessly output. In this case, the control means 24 of the main controller 20 sets a predetermined time (an arbitrary settable time, for example, 3
When the wireless device 41 receives a response signal indicating that the oil amount is full from the wireless device 49 of the sub-controller 45 within the second), refueling from the hatch portion 8 to the underground tank 15 is controlled to be stopped.

In the above embodiment, the underground tank 1
The optical sensor 33 for detecting the amount of oil in
Although the configuration provided for each of (15a to 15d) has been described, an oil level gauge may be provided for each underground tank 15 depending on the filling station 5. The oil level gauge is, for example, a column installed in the underground tank 15 and a float is vertically movably mounted, and the amount of movement of the float moving up and down in conjunction with the change in the oil level is captured as a change in air pressure, and the oil level is measured. This is for obtaining position information.

In this case, if the detection signal of the oil level gauge for each underground tank 15 is inputted to the control means 48 of the sub-controller 45 instead of the optical sensor 33, the optical sensor 33 is additionally provided. There is no need to use the existing configuration to prevent the underground tank 15 from overflowing.

In the above embodiment, the tank truck 3
It has been described that the petroleum products are supplied only to the second hatch portion 8b and are unloaded to the gas station 5. However, the petroleum products are also supplied to the other hatch portions 8a and 8c to 8g to be unloaded to the gas station 5. Can be done. In this case, the above-described operation is performed by bringing the transport-side oil type key 14 that comes off the key box 13 for each hatch portion 8 when refueling the hatch portions 8.

Further, in the above-described embodiment, the configuration for unloading the petroleum products stored in the hatch portion 8 from one discharge port 11a has been described. However, the configuration of the tank truck 3 shown in FIG. The intermediate gate valve 12 is opened and closed according to an instruction of an intermediate gate valve switch (not shown) separately provided on the two discharge ports 11 a and 11 b and the operation panel 21 so as to unload the petroleum products stored in the hatch portion 8. It may be.

For example, when the same type of petroleum product is stored in a plurality of hatches 8, one of the discharge ports 11a and 11b is controlled to be closed while the intermediate gate valve 12 is open. The petroleum products stored in the plurality of hatch portions 8 can be unloaded at one time. Further, two sets of key information detecting means 23 for detecting information of the transport-side oil type key 14 and the storage-side oil type key 17 are provided, and the intermediate gate valve 12 is controlled to a closed state by an instruction of the intermediate gate valve switch. Discharge port 11
If you decide to unload petroleum products from a, 11b,
Further, work efficiency can be improved. However, all of the above operations are executed on the assumption that the information on the transport-side oil type key 14 and the information on the storage-side oil type key 17 match.

[0067]

As is apparent from the above description, according to the present invention, when unloading petroleum products to an underground tank of a gas station, if the oil volume of the unloading underground tank becomes full, Since refueling from the hatch to the underground tank is automatically stopped, it is possible to reliably prevent underflow tank overflow and ensure safety without constantly monitoring the state of oil product refueling to the underground tank. .

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an oil feed system to which an underground tank overflow prevention system according to the present invention is applied.

FIG. 2 is a schematic diagram of a tank truck applied to the oil supply system of FIG. 1, illustrating a state where petroleum products are unloaded into an underground tank of a gas station.

FIG. 3 is a configuration diagram of an optical sensor provided for each underground tank at a gas station.

FIG. 4 is a block diagram of a main controller provided in the tank truck of FIG. 2 and a sub controller provided in a gas station.

FIG. 5 is an external view of a main controller of FIG. 4;

FIG. 6 is a block diagram showing an internal configuration of a main controller of FIG. 4;

FIG. 7 is a schematic diagram of a conventional oil mixing and oil leakage prevention device for an underground tank.

FIG. 8 is a block diagram showing the configuration of the apparatus shown in FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Oil supply system, 2 ... Oil tank, 3 ... Tank truck, 5 ... Refueling station, 8 ... Hatch, 15 ... Underground tank, 2
0: Main controller, 24, 48: Control means (CPU), 4
1, 49: radio, 45: sub-controller.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Noboru Kanai 4-26-12 Hakusan, Bunkyo-ku, Tokyo F-term (reference) 3E083 AA03 AA13 AB11 AD05 AD11 AD18 AJ10 AJ11

Claims (4)

[Claims] 1. A petroleum product stored in an oil depot is refueled to a hatch portion of a tank truck by oil type and received, and the received petroleum product in the hatch portion is refueled to an underground tank of the refueling station for each oil type. In the oil delivery system for unloading, an oil level gauge is provided for each of the underground tanks, detects an oil level in the underground tank, and outputs a detection signal according to the oil level, and Provided, a detection signal from the oil level gauge is input to determine whether or not the oil amount in the underground tank to be unloaded is full, and a signal indicating that when the oil amount is determined to be full. A sub-controller that wirelessly outputs a signal, which is provided in the tank truck and, when a signal indicating that the amount of oil in the underground tank is full is received from the sub-controller, corresponds to the received signal. From the hatch to the underground tank A system for preventing overflow of an underground tank, comprising: a main controller that controls stop of refueling. 2. A petroleum product stored in an oil depot is refueled to a hatch portion of a tank truck by oil type and received, and the received petroleum product in the hatch portion is refueled to an underground tank of the refueling station for each oil type. In the oil delivery system for unloading, an oil level gauge is provided for each of the underground tanks, detects an oil level in the underground tank, and outputs a detection signal according to the oil level, and Provided, the detection signal from the oil level gauge is input to determine whether the oil amount in the underground tank to be unloaded is full, the oil amount is determined to be full, and a call signal is received. Sometimes, a sub-controller that wirelessly outputs a response signal indicating that the oil amount is full, and is provided in the tank truck, and wirelessly outputs a call signal to the sub-controller at a predetermined cycle, A response signal from the sub-controller to a paging signal And a main controller for stopping and controlling the refueling of the underground tank corresponding to the received response signal from the hatch when receiving the response signal. 3. A petroleum product stored in an oil depot is refueled to a hatch portion of a tank truck by oil type and received, and the received petroleum product in the hatch portion is refueled into an underground tank of the refueling station for each oil type. In an oil delivery system for unloading and unloading, an optical sensor that is provided for each of the underground tanks, emits light toward an oil surface in the underground tank, and outputs a detection signal according to the amount of reflected light accompanying the emission of the light Provided at the gas station, determines whether or not the oil amount in the underground tank to be unloaded is full using the detection signal from the optical sensor as an input, and determines that the oil amount is full. A sub-controller that wirelessly outputs a signal indicating that, provided in the tank truck, when receiving a signal indicating that the amount of oil in the underground tank is full from the sub-controller, receiving the signal Underground tank corresponding to the signal A main controller for stopping and controlling the refueling of the underground tank from the hatch portion. 4. A petroleum product stored in an oil depot is refueled to a hatch portion of a tank truck by oil type and received, and the received petroleum product in the hatch portion is refueled to an underground tank of a refueling station for each oil type. In an oil delivery system for unloading and unloading, an optical sensor that is provided for each of the underground tanks, emits light toward an oil surface in the underground tank, and outputs a detection signal according to the amount of reflected light accompanying the emission of the light And, provided in the gas station, determines whether the oil amount in the underground tank to be unloaded is full with the detection signal from the optical sensor as an input, it is determined that the oil amount is full, and A sub-controller that wirelessly outputs a response signal indicating that the oil level is full when a call signal is received; and a sub-controller that is provided in the tank truck and wirelessly transmits a call signal to the sub-controller at a predetermined cycle. And output the When receiving a response signal from the sub-controller, a main controller that stops and controls refueling from a hatch portion to the underground tank corresponding to the received response signal, and an underflow tank overflow prevention. system.