JPH0321438B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oil mixture prevention device that prevents oils of different types from being supplied from a tank lorry to a storage tank at a gas station.

[Conventional technology]

In order to prevent oil mixtures caused by the type of oil being unloaded from a tank truck being mismatched with the type of oil in the storage tank at a filling station, the device disclosed in JP-A No. 58-149300 is designed to For example, the type of oil is detected from the natural frequency of the oil, and if the detected oil type and the oil type in the storage tank at the filling station specified by the operator do not match, the oil type is detected in the middle of the discharge passage of the tank truck. The gate valve is kept closed.

Utility Model Application No. 162216/1984 discloses that the type of oil is detected not by the transmittance but by the amount of transmitted light.

Japanese Utility Model Publication No. 59-72299 discloses the use of a key for the lid of the fuel filler port of each storage tank at a gas station in order to detect the type of oil in the storage tank at the gas station.

[Problem to be solved by the invention]

When detecting the type of oil by the amount of transmitted light, as in the case of the microfilm disclosed in Utility Model Application No. 162216/1982, the amount of transmitted light is determined by changes in the light amount of the light source, dirt on the optical path from the light source to the light amount detector, etc. Since it is easily affected by fluctuations, it is easy to incorrectly detect the oil type.

In JP-A-58-149300, a gate valve is added to the discharge passage separately from the discharge valve, so it is necessary to secure a new installation space for the gate valve, and the structure of the discharge passage is changed. It gets complicated.
Furthermore, since the type of oil in the storage tank of the gas station to which oil is to be supplied is specified by the operator, it is easy to specify the type of oil incorrectly and cause an oil mixing accident.

In Utility Model Application Publication No. 59-72299, it is necessary to provide one key switch for each key, which increases the number and complexity of the detection means for detecting the type of oil in each storage tank at a filling station. .

An object of the present invention is to provide an oil mixture prevention device that can overcome the problems of the prior art as described above.

[Means to solve the problem]

The oil mixture prevention device of the present invention includes the following components (a) to (e).

(a) An oil type plug that corresponds to the oil type of each storage tank at the gas station, paired with a key for the lid of the fuel filler port of each storage tank at the gas station. (b) A bottom valve at the bottom of the tank chamber of the tank lorry. (c) A light-transmitting part that is arranged in the discharge passage that guides oil from the discharge passage to the discharge valve and allows light to pass through it.The ratio of the amount of transmitted light in the light-transmitting part when there is oil in the discharge passage and when there is no oil is detected as the transmittance. Transmittance detecting means (d) Comparing the output of this transmittance detecting means with the reference value for the oil type corresponding to the oil type plug, it is determined that the type of oil in the discharge passage and the oil type corresponding to the oil type plug match. Judgment means (e) for judging whether or not the conditions are met; Lock control means (operation) for releasing the lock on the closed state of the discharge valve when it is judged by this judgment means that the conditions are met; Since the amount of transmitted light changes depending on the discharge path, the ratio of the amount of transmitted light in the light transmitting portion when oil is present in the discharge passage and when no oil is present, that is, the transmittance is related to the type of oil. Therefore, by comparing this transmittance with a reference value related to the oil type corresponding to the oil type plug, the type of oil present in the discharge passage can be determined. Furthermore, when the detected transmittance value does not match the above-mentioned reference value for any oil type, by displaying that the oil type cannot be determined, it becomes possible to correctly identify only normal oils. The lock control means releases the lock of the closed state of the discharge valve when the type of oil in the discharge passage and the type of oil corresponding to the oil type plug match, and thereby locks the closed state of the discharge valve. Refueling from tanker trucks becomes possible.

〔Example〕

The invention will now be described with reference to the illustrated embodiments.

In FIG. 2, storage tanks 12a, 12b, and 12c are provided underground in the gas station 10 for each type of oil, such as gasoline, diesel oil, and kerosene.
The fuel fill ports 14a, 14b, and 14c are arranged at or near the ground, and are connected to an underground storage tank 12, respectively.
a, 12b, and 12c. Each fuel filler port 14
a, 14b, 14c are the caps 18a, 18b, 1 except when refueling from the tank truck 16.
8c, each cap 18a, 1
8b and 18c are fitted with locks 20a, 20b and 20c.

There is a key chain 22 in the office 21 of the gas station 10.
a, 22b, 22c are stored, and each key holder 22a, 22b, 22c has a lock 20a, 20a, 22c stored therein.
An oil type plug 26 is attached together with keys 24 corresponding to 0b and 20c.

In this embodiment, the tank 28 of the tank truck 16 is divided into three tank chambers 30a, 30b, and 30c.
There are hatches 31a, 31b, 3 on the top and bottom of c.
1c and bottom valves 32a, 32b, 32c are respectively arranged, each tank chamber 30a, 30b, 30c is connected to a common discharge passage 34 via the bottom valve 32a, 32b, 32c, and the discharge valve 36 is connected to the discharge passage 34.
located at the exit. Each bottom valve 32a, 32
b, 32c are the bottom valve handles 3 at the top of the tank 28
7a, 37b, and 37c. The control device 38 is disposed at an arbitrary location such as the rear side of the cab 40, and the light transmitting section 42 is disposed in the middle of the discharge passage 34. At the time of refueling, the tank lorry vehicle 16 is grounded by the ground wire 44, and the outlet side of the discharge valve 36 is connected to a predetermined refueling port by the hose 46.

FIG. 1 shows the main part of this invention.
The light that crosses the discharge passage 34 in the light transmitting section 42 is sent to the light sensor 56 by the optical fiber 54.
sent to. Oil type detection means 58 for oil type plug 26
is from the groove position of the oil type plug 26 to the oil type plug 26
Detects the oil type that corresponds to. The microcomputer 60 controls the switching valve 62, printer 64, indicator lamp 66, and alarm 68 based on inputs from the optical sensor 56 and oil type detection means 58. The switching valve 62 controls the supply of pressurized air from the pressure source 70 to the discharge valve 36 and the discharge of pressurized air from the discharge valve 36 . Note that instead of the printer 62, a memory element,
The oil type discrimination results can be recorded using other recording devices such as a floppy disk.

FIG. 3 is a detailed view of the panel section 72 of the control device 38. The oil type plug 26 is inserted into the hole 74,
Oil type A to C corresponding to the inserted oil type plug 26
The fueling station lamp 76 indicating this lights up. Further, the lamp 7 of the lorry indicates the types of oil A to C in the discharge passage 34 detected by the microcomputer 60.
8 lights up, and when the type of oil in the discharge passage 34 cannot be detected, the lamp 80 lights up. When the oil types at the filling station and the lorry match, an "unlock" indicator lamp 66 lights up, and when the two oil types differ, a "mixed oil" indicator lamp 66 lights up and an alarm 68 sounds. Note that the control device 38 inputs power when the oil type plug 26 is inserted into the hole 74, and the alarm 68 is activated.
A flashing lamp, audio display, etc. can also be used instead.

FIG. 4 is a detailed view of the discharge valve 36. Discharge valve 3
6 has a lever 86 for operating a plug 84, and a hole 88 is bored at one location in the circumferential direction of the plug 84. The locking piece 90 is biased toward the plug 84 by a helical compression spring 92, and the hole 88 is inserted into the passageway 94.
Pressurized air is supplied from the switching valve 62 via the switching valve 62.
When the discharge valve 36 is in the closed position, the lock piece 90 is inserted into the hole 88 and the discharge valve 36 is locked, making it difficult to rotate the plug 84 by operating the lever 86, that is, to switch from the closed position to the open position. It's summery. At this time, when pressurized air is supplied to the hole 88 from the switching valve 62, the locking piece 90 is forced out of the hole 88 against the spring 92 by the pressurized air, and the lock is released, and the discharge valve 36 is opened. becomes possible.
When the discharge valve 36 is moved from the open position to the closed position, the discharge valve 36 is moved to the closed position, and the lock piece 90 is inserted into the hole 88 as pressurized air is released to the atmosphere.
Lock occurs.

FIG. 5 is a flowchart of a program for detecting the type of oil in the discharge passage 34. Bottom valve 3 corresponding to the type of oil to be unloaded from the tank truck 16
Any one of 2a to 32c is opened, and the discharge passage 34
The amount of light transmitted through the light transmitting section 42 is measured before oil is introduced into the light transmitting section 42 (step 98). After that, when one of the bottom valves 32a to 32c is opened, oil is introduced into the discharge passage 34. Then, the amount of transmitted light changes, and the inflow of oil is detected. When the amount of transmitted light ceases to fluctuate, that is, when the light transmitting section 42 is completely filled with oil, the amount of transmitted light is measured again (step 102), and the measured amount of transmitted light is compared with the case when no oil is present in the light transmitting section 42. The ratio of the amount of light transmitted through the light transmitting section 42 is calculated as the transmittance (step 10).
4). Since the amount of transmitted light differs depending on the oil type, the transmittance also differs depending on the oil type, and the oil type can be detected by the transmittance.The transmittance is set in advance as a reference value for each oil type. , by comparing the calculated transmittance with the reference value (step 1).
06), the type of oil in the discharge passage 34 is determined (step 108). If the calculated transmittance is within a predetermined range from the reference value, it can be determined that the oil type corresponds to the reference value. If the transmittance does not fall within the predetermined range of any of the reference values, a message indicating that the oil type cannot be determined is displayed and the discharge valve is kept locked.

Furthermore, since the transmittance is not affected by fluctuations in the optical system, it is possible to eliminate these influences and accurately detect the oil type.

FIG. 6 is a procedural diagram of the refueling operation. When the tank truck 16 stops, the engine of the tank truck 16 is stopped (step 114), the ground wire 44 is connected (step 116), and the tank 28 is stopped.
The hatches 31a to 31c, that is, the type and quantity of oil for each tank chamber 30a to 30c are confirmed (step 118), the bottom valves 32a to 32c are confirmed to be closed (step 120), and the oil type and quantity are confirmed for each tank chamber 30a to 30c (step 120).
Check the inventory amount of 0c (step 122). Next, we discuss the unloading procedure (Step 1).
24), Refueling ports 14a and 14b that will be refueled from now on
Or, remove the lock 20a, 20b or 20c of 14c with the corresponding key 24 (step 12).
6) Insert the oil type plug 26 connected to the key 24 into the hole 74 in the panel part 72 (step 1).
28), connect the hose 46 between the oil supply port 14a, 14b or 14c and the discharge valve 36 (step 1).
30) Open the bottom valve 32a, 32b or 32c corresponding to the type of oil (step 132). On the other hand, by inserting the oil type plug 26 into the hole 74 of the panel section 72, power is input to the control device 38 (step 1).
34), gas station storage tank 12a, 12b or 1
The type of oil 2c is determined by the oil type plug 26 (step 136), and the type of unloading oil is determined based on the flowchart shown in FIG. 5 (step 138), and whether the two oil types match or not. is determined (step 140). If they do not match, it is determined that the oils are mixed (step 142), an alarm is generated (step 144), and the discharge valve 36 is kept locked.
If they match, the discharge valve 36 is manually unlocked (step 146), the discharge valve 36 is opened (step 148), and unloading is completed (step 150).
That is, check the remaining oil in the tank chamber 30a, 30b, or 30c of the tank 28 (step 152), and close the bottom valve 32a, 32b, or 32c (step 1).
54), close the discharge valve 36 (step 158), remove the hose 46 (step 158), and remove the panel part 7.
When the oil type plug 26 is removed from the hole 74 of No. 2, the power to the control device 38 is turned off (step 160). Next, the fuel filler port 14a, 14b or 14c is locked (step 162), the amount of inventory in the underground tank 12a, 12b or 12c is confirmed (step 164),
The ground wire 44 is disconnected (step 166), and the tank truck 16 departs (step 168).
Step 1 when multiple types of oil are unloaded
22 to 164 are repeated. Also, step 13
Since steps 4 to 146 are automatically performed by the control device 38, only steps 128 and 160 are added by the present invention to the conventional operations. Since power will not be input to the control device 38 unless the oil type plug 26 is inserted, that is, the switching valve 62 will not operate and the closed position of the discharge valve 36 will not be unlocked. The discharge valve 36 can be prevented from opening. Only the light transmitting portion 42 is present in the discharge passage 34, and the electric means can be disposed far away from the oil, so safety can be improved.

In the above example, a case is shown in which there are three tank chambers of a tank truck, three storage tanks at a gas station, and three types of oil to be determined. The present invention is applicable.

Further, although the case where the discharge passage is common is shown, this can also be applied to a tank lorry vehicle having one or more discharge passages.

〔Effect of the invention〕

The effects of this invention are as follows.

(a) The amount of transmitted light when oil is present in the light transmitting part of the discharge passage and when it is not present, with respect to changes in the light spreading system such as changes in the light amount of the light source and dirt on the light path from the light source to the light amount detection part. Since the amount of transmitted light changes approximately at the same rate, as a result of detecting the type of oil to be unloaded based on the transmittance, it is possible to eliminate fluctuations in the optical system and accurately detect the type of oil.

(b) Since unloading is permitted or prohibited by locking and unlocking the discharge valve that the worker opens and closes when unloading, there is no need to provide a separate gate valve, etc., simplifying the configuration of the discharge passage. Can be done.

(c) When detecting the oil type in a gas station storage tank directly from the key for the fuel filler cap of each storage tank at a gas station, the structure of the detection means is complicated due to the structural limitations of the key. Although it is necessary to prepare a detection lock for each key, since the oil type in each storage tank at the filling station is detected from the oil type plug paired with the key, the oil type plug can be detected by the detection means. By selecting dimensions, shapes, and structures that are easy to detect, the detection means can be made common to each key, and the structure of the detection means, which tends to be complicated, can be simplified.

In particular, depending on the oil type, as in the case of diesel oil and kerosene, the transmittances may be very close to each other, and in such cases, forcing the oil type to be discriminated may result in misclassification. This may lead to oil mixture accidents. In the embodiment section of this invention, if the detected permeability does not fall within the reference value range of the permeability of all oil types corresponding to the oil type plug, it is displayed that the oil type cannot be determined, and the discharge valve By maintaining this lock, it is possible to prevent oil mixture accidents when the oil type is difficult to distinguish.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the main parts of an embodiment of this invention;
FIG. 2 is an overall schematic diagram of the embodiment, FIG. 3 is a diagram showing the panel part of the control device, and FIG. 4 is a detailed diagram of the discharge valve.
FIG. 5 is a flowchart of a program for detecting the type of oil in the discharge passage, and FIG. 6 is a flow chart of the oil supply operation. DESCRIPTION OF SYMBOLS 10... Gas station, 12a, 12b, 12c... Storage tank, 16... Tank lorry, 26... Oil type plug, 28... Tank, 30a, 30b, 30c... Tank chamber, 32a, 32b, 32c... Bottom valve, 34...
Discharge passage, 36...Discharge valve, 38...Control device (transmittance detection means, determination means), 62...Switching valve (lock control means).

Claims (1)

[Scope of Claims] 1. An oil type plug that is paired with a key for the lid of the fuel filler port of each storage tank at the gas station and corresponds to the oil type of each storage tank at the gas station, and the bottom of the tank chamber of the tank lorry. a light transmitting part that is disposed in a discharge passage that guides oil from a bottom valve to a discharge valve and is capable of transmitting light; and an amount of light transmitted in the light transmitting part when oil is present in the discharge passage and when oil is not present in the discharge passage. The type of oil in the discharge passage and the type of oil are determined from the ratio between the output of the permeability detection means and a reference value related to the oil type corresponding to the oil type plug. A determining means for determining whether or not the type of oil corresponding to the plug matches, and a lock control for unlocking the closed state of the discharge valve when the determining means determines that they match. An oil mixture prevention device comprising means. 2. The determination means determines that the type of oil in the discharge passage matches the type of oil corresponding to the oil type plug when the output of the transmittance detection means is within a predetermined range with respect to the reference value. An oil mixture prevention device according to claim 1. 3. In detecting the transmittance, a device is provided that automatically detects the inflow of oil into the light transmitting portion based on a change in the amount of transmitted light, and the measurement of the amount of transmitted light before the inflow and the amount of transmitted light after the inflow is automated, An oil mixture prevention device according to claim 1, which automates oil type discrimination. 4 If the permeability detected by the permeability detection means does not fall within the reference value range of the permeability of all oil types corresponding to the oil type plug, it is displayed that the oil type cannot be determined, and the discharge An oil mixture prevention device according to claim 1, which keeps the valve locked.