JPH082595A - Apparatus for preventing oil mixture - Google Patents

Abstract

PURPOSE:To prevent different kinds from being mixed when a different kind of petroleum is to be erroneously discharged put into an underground tank at the time of unloading petroleum from a tank truck into the underground tank at a gas station. CONSTITUTION:A refractive index of light in petroleum to be unloaded is directly detected to determine its type, and a valve 17 is opened for an underground tank for receiving load while the valve 17 remains closed for an underground tank which should not receive the load but an alarm buzzer is sounded to indicate that an error occurs, thereby preventing different kinds of petroleum from being mixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil mixing prevention device in a gas station or the like.

[0002]

2. Description of the Related Art A plurality of storage tanks are provided at a gas station or the like for each type of oil. It is stored separately for each type of regular gasoline, high-octane gasoline, light oil, and kerosene.
If these fuels are mistakenly replenished from a tank truck to a storage tank of a different oil type, oil mixture will occur, resulting in great damage.

As a countermeasure for the above-mentioned statement, the oil mixture is prevented by comparing the data of the oil type loaded in the tank truck with the data of the oil type at the place of unloading. (JP-A-5-97195
No. 6), the oil discharged from the tank truck is detected by a gas sensor to prevent the oil mixture (Japanese Patent Laid-Open No. 6-100).
No. 096) is known.

[0004]

[Problems to be Solved by the Invention] However, it cannot be said that there is no mistake because the oil type data loaded in the tank truck is finally driven by human labor. Further, there is a problem in the detection of all oil types because the device for detection by one gas sensor depends on the selection of whether the oil type has a high boiling point or a low boiling point.

[0005]

The present invention has been made to solve the above-mentioned conventional problems, and is characterized in that a gas station normally handles four types of petroleum, namely, There are four types: regular gasoline, high-octane gasoline, light oil, and kerosene. Since these four types of petroleum have different light refractive indices, the problem was solved by directly measuring the light refractive index of petroleum.

[0006]

According to the present invention, an underground tank and a tank truck are provided.
A valve is provided between the connection portions of the above-mentioned valves and is normally in a closed state, and is designed to keep the valve in an open state only when the control circuit judges that the unloading may be performed. The valve is opened and closed by air pressure, the sensor is an optical refractive index detector, and the control unit is composed of a microcomputer, an air control solenoid valve, warning lamps and switches. When the power to the control unit is turned on, the microcomputer is initialized, and each sensor self-checks whether it is operating normally and whether the air pressure is normal. If any of these are NG, a warning is given and a self-check is performed to stop the operation. If it is OK, the valve is closed and waiting for unloading, the hose of the tank lorry is connected, and the oil is stopped by the valve when the lorry cock is opened for unloading. Tells the microcomputer that oil has been introduced into the detection tube because it is filled with oil and that the unloading of oil has started due to a change in the refractive index. When this start signal is input, the valve is opened for a few seconds and the residual oil is poured in again in order to prevent misidentification due to the residual oil in the previous hose and the residual oil in the hose of the roller. Is closed and the oil in the true roller is introduced into the detection tube, and the oil type is discriminated by the refractive index detector. If the type of oil matches the type of oil stored in advance, open the valve, unload the valve, and open the valve until the completion of the operation. Close and exit to return to the initial state.
On the other hand, if an oil different from the stored oil type is detected, the mixed oil NG lamp blinks with the valve closed and the buzzer
It gives an alarm by In this case, the operation is restarted by connecting the rollers and pressing the reset switch, so that the oil mixture can be reliably prevented.

[0007]

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

FIG. 1 is a schematic view of the unloading of oil from a tank truck at a gas station. There is a pipe 3 and a hose 4 for supplying the oil carried by a tank truck 1 to an underground tank 2, and a pipe 3 A fuel filler fitting 5 is provided at the end of the hose 4 to facilitate connection between the end of the hose 4 and the pipe 3. When the fuel tank fitting 5 is connected, the tank 6 of the tank truck 1 and the underground tank 2 communicate with each other, so that the oil in the tank 6 is easily unloaded into the underground tank 2.

A mixed oil valve 7 is provided in the middle of the pipe 3, and once the oil is unloaded, the mixed oil valve 7 is used to store the oil so that the refractive index of the oil can be directly measured. If the kind of oil matches the oil in the underground tank 2, the oil mixing valve 7 is opened to permit unloading. If the oil does not match, the oil mixing valve 7 is not opened and the alarm buzzer is sounded from the control unit 8. The oil mixing valve 7 and the control unit 8 are wired by a cable 9.

FIG. 2 is a configuration diagram of the oil mixing valve 7 and the control unit 8 and FIG. 3 is a flowchart. In this system, when the control unit 8 is powered on, the microcomputer 10 is initialized and It self-checks whether the sensor is operating normally and whether the air pressure is normal. If it is OK, the standby lamp 11 which is in the receiving state is turned on, and if any of them is NG, each NG The lamp 12 or 14 or 16 indicating is turned on and the operation is stopped.

If the self-check is OK, the valve 17 is closed and waiting for unloading, the tank lorry-1 comes to the gas station, and the hose 4 is connected to the filler metal 5 as in the above process.
Is connected and the cock (not shown) of the tank lorry-1 is opened for unloading, the oil is stopped by the valve 17, and the upper part of the valve 17 is filled with the oil so that Oil is introduced, the refractive index detector 19 measures the change in light, and the cable 9 notifies the microcomputer 10 that the microcomputer 10 recognizes that the unloading of oil has started.

The air compressor 28 supplies air to the air solenoid valve 20 in advance.

The air solenoid valve 20 is opened and air is sent from the air tube 21 to the air cylinder 22. Since the valve 17 and the air cylinder 22 are linked by the interlocking rod 23, the air cylinder 22 is moved by the pressure of the air,
Along with this, the valve 17 is opened. The time for which the valve 17 is opened is determined in advance by the microcomputer for several seconds.
At, the air pressure in the air cylinder 22 is released and the valve 17 is closed.

During the above-mentioned several seconds, the valve 17 is opened for a few seconds in order to remove the previous oil accumulated in the hose 4 and other places in the previous unloading by the opening of the valve 17 and to prevent the misidentification due to the residual oil of the previous time. It opens and pour the residual oil of the last time.

When the valve 17 is closed and the oil is filled in the upper portion of the valve 17 again, the true oil is introduced into the detection tube 18, and the refractive index detector 19 is operated. When the oil is applied to the oil, the light source passes through the oil and is introduced into the refractive index detector 19 to capture and measure the refractive index of the oil, and the cable 9 informs the microcomputer 10 to determine the oil type.

When the oil matches the type of oil stored in advance, the microcomputer 10 opens the air solenoid valve 20, sends air from the air tube 21 to the air cylinder 22, and opens the valve 17 by the interlocking rod 23. At the same time that the unloading is started, the OK lamp 15 and the valve opening lamp 13 are turned on.

After a certain period of time, for example, 30 from the above-mentioned unloading
After the lapse of minutes, the valve 17 is restarted by the program of the microcomputer 10.
To close and return to the original standby state.

On the other hand, when oil different from the oil type stored in the microcomputer 10 is detected, the valve 17 remains closed and the mixed oil NG lamp 26 blinks and a buzzer or the like issues an alarm. In this case, the above operation is restarted by reconnecting the hose 4 and pressing the reset switch 27.

Further, the present embodiment can be freely modified so that, for example, the valve of the overflow prevention device can be shared with the valve 17 of the present embodiment. Furthermore, various controls can be performed by capturing the signal data of the remote level gauge.

[0020]

As described above, according to the present invention, the oil itself to be unloaded is measured, the oil type to be unloaded is determined, and the underground tank is filled with the oil. Since it can handle all types of oil, it can completely prevent mixed oil. The total installation cost is also low.

[Brief description of drawings]

FIG. 1 is a schematic view of a gas station and a longitudinal sectional view of an underground portion.

FIG. 2 is a system configuration diagram of the present invention.

FIG. 3 is a flowchart of the present invention.

[Explanation of symbols]

 1 Tank truck 2 Underground tank 3 Piping 4 Hose 5 Oil filler metal fitting 6 Tank 7 Oil mixture valve 8 Control unit 9 Cable 10 Microcomputer 11 Standby lamp 12 Lamp 13 Valve open lamp 14 Lamp 15 OK lamp 16 Lamp 17 Valve 18 Detection tube 19 Refraction Rate detector 20 Air solenoid valve 21 Air pipe 22 Air cylinder 23 Interlocking rod 24 Air discharge valve 25 Light projector 26 Mixed oil NG lamp 27 Reset switch 28 Air compressor

Claims (1)

[Claims] 1. An oil mixing prevention device, characterized in that, when filling a container with petroleum, such as at a gas station, the oil type of the petroleum is determined by detecting the refractive index of the light of the petroleum. .