JPH06100096A - Device for discriminating mixture of oil to oil tank - Google Patents

Abstract

PURPOSE:To detect and inform without fail at an early time that the kind of oil is wrong when the oil is poured from a tank lorry into an oil storing tank. CONSTITUTION:A hose 18 from a tank lorry 17 is connected to an oil pouring tube 20, so that part of fuel oil in the oil pouring tube 20 is taken into a sampling means 35 through a flow passage 29. The fuel oil thus taken in is vapourized compulsorily by applying air to the sampling means 35, so that the kind of the fuel oil is determined by an oil kind determining means 31 based on the vaporized gas. If the kind of the oil is determined to be wrong, an alarming means 33 gives an alarm to inform that the oil kind is wrong.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for determining the type of fuel oil to be unloaded from a tank truck and injected into a storage tank buried underground such as a gas station.

[0002]

2. Description of the Related Art A plurality of storage tanks for each type of oil such as gasoline, kerosene, and light oil are buried underground in a gas station, and each storage tank is individually provided with an oiling pipe extending so as to project above the ground. Has been. An oil supply hose provided in the tank truck is connected to each storage tank to unload the fuel oil loaded in the tank tank so as not to cause a difference in oil type.

As shown schematically in FIG. 8, the tank tank tank tank truck 1 includes two storage tanks 4a and 4b for accommodating, for example, 2 kiloliters of fuel oil by a plurality of partition walls 3a to 3e, and 4 It is partitioned into four storage tanks 4c, 4d, 4e, 4f in which kiloliters of fuel oil are stored. The fuel oil stored in each of the storage tanks 4a to 4f is
As an example, kerosene is stored in the storage tank 4a, and
Light oil is stored in b, regular gasoline is stored in the storage tanks 4c, 4d, and 4e, and high-octane gasoline is stored in the storage tank 4f.

The fuel oil in each of the storage tanks 4a to 4f is divided into branch pipes 5a to 5f which are individually connected to the storage tanks 4a to 4f.
And a communication pipe 6 that is commonly connected to and connected to each of the branch pipes 5a to 5f, and is guided to an oil supply hose 7, which is connected to an oil supply pipe extending from the storage tank buried underground. To be done.

Each branch pipe 5a-5f is individually provided with an on-off valve 8a-8f which is opened / closed when the fuel oil is unloaded, and an on-off valve 9 is provided near the downstream end of the communication pipe 6. Is provided. For example, when unloading kerosene, first, of the plurality of on-off valves 8a to 8f, the on-off valve 8a provided corresponding to the storage tank 4a in which kerosene is stored is opened, and then the on-off valve 9 is opened. By doing so, only kerosene can be unloaded and oiled, but the operator mistakenly opens and closes the open / close valve 8
If c is opened, regular gasoline will be mixed in the kerosene, and regular gasoline will be injected into the storage tank. Therefore, the oil in the storage tank cannot be sold unless the oil in the storage tank is collected.

Further, the operator notices that the open / close valve 8c is opened, and the operator notices that oil is mixed,
If it is found to be a mixed oil due to odor,
Although it may occur that the amount of fuel oil with different oil types supplied to the storage tank may be small, even if the amount of gasoline mixed with kerosene is small, there is a great risk of causing an accident such as a fire. It is extremely rare that the oil mixture resulting from the operation error of the on-off valve 8c is identified by odor or visual inspection, and in most cases, it is necessary to fill the storage tank with oil before realizing that the oil type is different. Therefore, it takes a lot of time and labor to collect all the mixed oil in the storage tank, and the collection of all mixed oil is completed and fuel oil without mixed oil is injected again. Until then, the oil in the storage tank cannot be sold.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent the sale of mixed oil in a storage tank and to detect the occurrence of different oil types at an early stage. It is an object of the present invention to provide a mixed oil determination device for a storage tank.

[0008]

The present invention is directed to a storage tank buried underground, an oil supply pipe extending from the storage tank to the ground and supplied with fuel oil to be injected, and a fuel flowing in the oil supply pipe. Intake part of the oil from the inflow path,
Sampling means for discharging the taken fuel oil from the outflow path to the downstream side of the inflow path of the oil injection pipe, forced vaporization means for supplying air to the fuel oil guided to the sampling means, and the sampling means. The vaporized gas of the fuel oil inside is introduced, and in response to the output from the oil type determination means for determining the oil type based on this gas, the oil type determination means determines that the oil type is different. It is an apparatus for determining an oil mixture in a storage tank, which includes an informing unit that issues an alarm when it is determined that there is an oil mixture.

Further, according to the present invention, a storage tank buried underground, an oil supply pipe extending from the storage tank to the ground and supplied with fuel oil, and a part of the fuel oil flowing in the oil supply pipe are combined into a single stream. Sampling means for taking in the fuel oil from the passage and discharging the taken-in fuel oil from the passage, and a nozzle for injecting air toward the passage in the oiling pipe, and the air jetted from the nozzle The vaporization means for pushing in the sampling means while vaporizing a part of the fuel oil in the oil injection pipe and the vaporized gas of the fuel oil in the sampling means are introduced, and the oil type is determined based on this gas And a notification means for issuing an alarm when the oil type determination means determines that the oil type is different in response to the output from the oil type determination means. Size It is a device.

[0010]

According to the present invention as set forth in claim 1, an oiling pipe is connected to a storage tank buried underground, and a hose or the like of a tank truck is connected to the oiling pipe to unload fuel. Oil is supplied. A part of the fuel oil flowing in the oil injection pipe is introduced into the sampling means through the inflow passage, and then discharged to the downstream side of the inflow passage of the oil injection pipe through the outflow passage. Air is supplied to the part of the fuel oil guided to the sampling means by forced vaporization means,
The gas of the fuel oil vaporized by this air is guided to the oil type determination means to determine the oil type. When the determination result by the oil type determination means is different, the alarm means issues an alarm such as an alarm sound or an alarm display, thereby notifying that the fuel oil supplied into the lubrication pipe is different in oil type. To be done. In this way, a part of the fuel oil in the lubrication pipe is gasified and sampled to determine the oil type, and an alarm is issued if there is a difference in the oil type, so it is necessary to detect the oil mixture in the storage tank early. It is possible to prevent the mixed oil from being sold accidentally in advance.

According to the second aspect of the present invention, an oil supply pipe is connected to the storage tank buried underground, and fuel oil is supplied to the oil supply pipe from a hose or the like of the tank truck. A part of the fuel oil flowing in the oil injection pipe is taken into the sampling means through the branch passage by the air injected from the nozzle provided in the oil injection pipe, and the fuel oil is vaporized by the air. The vaporized gas is guided to the oil type determination means to determine the oil type. When the oil type determining means determines that the oil type is different, the notifying means issues an alarm such as an alarm sound or an alarm display, thereby notifying that the fuel oil supplied into the lubrication pipe has the different oil type. Be informed. In this way, part of the fuel oil in the lubrication pipe is gasified and sampled to determine the oil type, and an alarm is issued if there is a difference in the oil type, so an oil mixture to the storage tank can be found early. In addition, it is possible to prevent the mixed oil from being sold by mistake in advance.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing a simplified overall structure of an embodiment of the present invention. A storage tank 16 is buried below the roadbed 15 of the gas station, corresponding to each type of fuel oil such as regular gasoline, high-octane gasoline, light oil, and kerosene. The hose 18 provided in 17 is a coupling 19
Fuel oil is unloaded and lubricated through the lubrication pipe 20 that is detachably connected by. The tank truck 17 has a tank tank 21 partitioned into a plurality of storage tanks by partition walls (not shown), and 4 kiloliters or 2 kiloliters of fuel oil is loaded in each storage tank for each oil type. The total amount of fuel oil loaded in the tank tank 21 is, for example, 20 kiloliters.

A plurality of branch pipes 23 are connected to the tanks 21 corresponding to the respective storage tanks, and on-off valves V1 are interposed in the respective branch pipes 23 so that the fuel in the respective storage tanks is stored. It is configured so that oil can be unloaded individually. Each branch pipe 23 is commonly connected to a single communication pipe 24, and an opening / closing valve V2 is provided near the downstream end of the communication pipe 24. The opening / closing valve V1 can be opened / closed by operating the handle 25, and the opening / closing valve V2 can also be opened / closed by an angular displacement operation of an operation lever (not shown). The hose 18 is detachably connected to the end of the communication pipe 24 by a coupling 26. The hose 18 is mounted on the tank truck 17 with the coupling 19 on the oil filling pipe 20 side removed.

An opening / closing valve V3 is provided in a portion 27 of the oil injection pipe 20 projecting upward from the roadbed 15, and the fuel in the oil injection pipe 20 is provided upstream of the opening / closing valve V3 in the fuel oil supply direction A. A sampling means 35 having a vaporization chamber 28 through which a part of oil is introduced is connected. A part of the fuel oil is taken into the vaporization chamber 28 from the inflow passage 29, and the taken fuel oil flows out to the oil supply pipe 20 downstream of the inflow passage 29 in the supply direction A. It is discharged via the path 30.
Air is supplied to the vaporization chamber 28 from below in order to promote vaporization of the fuel oil, and the gas of the fuel oil vaporized by this air is guided to the oil type determination means 31. When the fuel type to be injected into the storage tank 16 is, for example, light oil or kerosene, the oil type determination means 31 operates the notification means 33 when it is determined that gasoline is mixed and the oil type is different. , Is configured to notify that the oil type is different. The notification means 33 is realized by, for example, a buzzer or a lamp, and issues a warning sound by the buzzer, the lighting of the lamp, or both of these operations to give an alarm to surely notify the operator that the oil type is different. Is configured to be able to. When the operator visually confirms that the oil type is not different after the alarm by the notifying unit 33, it is possible to inject oil regardless of the alarm operation.
For example, the alarm operation of the notifying unit 33 is canceled by an input operation from the input unit 34 realized by a plurality of operation keys, and the on-off valve V3 closed when the oil type determination unit 31 detects a difference in oil type is opened. Then, the oil reduction work can be continued.

FIG. 2 is a system diagram showing a specific configuration of the sampling means 35 and the oil type determination means 31. Sampling means 35 is provided between the coupling 19 and the on-off valve V3 at the protruding portion 27 of the oil supply pipe 20. The sampling means 35 has a housing 36 formed integrally with the oil supply pipe 20 and forming the vaporization chamber 28. The housing 36 includes a side wall 37, a top plate 39 having a valve hole 38 formed therein, a bottom plate 43 having a liquid detector S _L and a nozzle 41 as a forced vaporizing means for injecting air, the inflow passage 29, and The fuel oil that constitutes a part of the outflow passage 30 and projects inward in the radial direction from the inner peripheral surface of the oil injection pipe 20 and flows in the oil injection pipe 20 flows from the inflow passage 29 into the vaporization chamber 2
8. Flow path forming portion 45 having a protrusion 44 for guiding the inside
And is provided directly above the nozzle 41 in the vaporization chamber 28,
The baffle plate 46 having an inverted U-shaped cross section perpendicular to the axis and the vaporization chamber 28
The float valve V4 closes the valve hole 38 by the rise of the liquid level inside.

The liquid detector S _L may be, for example, a capacitance type or a float type using a proximity switch or a micro switch.

The oil type judging means 31 is a compressed air pressure source 4
8, compressed air pressure source 48 to conduit 49 and this conduit 4
An ejector 51 to which compressed air is supplied via a pipe 50 branching from 9 and an on-off valve V interposed in the pipe 49.
5, a gas sensor 53 into which air or a vaporized gas of fuel oil supplied by the ejector 51 is guided, and an oil type determination circuit 54 that determines an oil type based on an output s1 from the gas sensor 53. The negative pressure generated in the ejector 51 is guided to the valve hole 38 by the pipe line 55 in which the opening / closing valve V6 is interposed, and the vaporized gas of the fuel oil accumulated in the vaporization chamber 28 above the liquid level is detected by the gas sensor. It is configured so that the oil type can be determined by leading to 53.

The pipe line 49 is connected to the inlet port of the check valve V7, and the outlet port is connected to the nozzle 41 via the pipe line 56. Therefore, when the on-off valve V5 is opened, the compressed air from the compressed air pressure source 48 is ejected by the ejector 5
The fuel oil is supplied to the fuel cell No. 1 and discharged from the nozzle 41, and is mixed with air in the fuel oil introduced into the vaporization chamber 28 to forcibly obtain the vaporized gas of the fuel oil. Vaporization chamber 2
The inflow amount or pressure of the air discharged from the nozzle 41 is set such that the liquid level in 8 rises too much and the float valve V4 does not close the valve hole 38.

When the opening / closing valve V6 is opened in a state where the opening / closing valve V5 is opened, that is, when the negative pressure is generated in the ejector 51, the negative pressure generated in the ejector 51 is vaporized through the valve hole 38. It is led to the chamber 28. Due to this negative pressure, as described above, the gas vaporized by the release of air from the nozzle 41 is supplied from the pipe 57 to the gas sensor 53 via the pipe 55 and the ejector 51, and the oil type determination operation is continuously performed. Continue to.

FIG. 3 is a flow chart for explaining the oil type determining operation at the time of unloading and lubricating, and FIG. 4 is a timing chart showing the opening / closing operations of the on-off valves V3, V5, V6. First, at step a1, the tank truck 17 arrives at the gas station, unloads and starts the lubrication work.
In step 2, the hose 18 is taken out from the tank lorry 17 and connected to the projecting portion 27 of the oil filling pipe 20 by the coupling 19. In step a3, the opening / closing valves V1 and V2 of the tank lorry 17 are closed with the opening / closing valve V3 of the oil filling pipe 20 closed. Is opened by the operator, the fuel oil flows from the hose 18 to the upstream side of the supply valve A in the oil supply pipe 20 with respect to the opening / closing valve V3,
A part of this fuel oil comes into contact with the protrusion 44 and flows into the vaporization chamber 28 from the inflow passage 29.

In this way, the hose 18 is connected to the lubrication pipe 2
When it is connected to 0 and the fuel oil fills the vaporization chamber 28,
In step a4, the switching mode of the connection detection switch (not shown) provided in association with the coupling 19 is switched, the power of the oil type determination means 31 is turned on, and the oil type determination operation is started. The oil type determination means 3
The power of No. 1 may be manually turned on by an operator.

In step a5, the oil type determination circuit 54 receives the liquid detection signal s2 from the liquid detector S _L and outputs the control signal s3 to open the open / close valve V5 at time t1 in FIG. 4 (1), The compressed air from the compressed air pressure source 48, which has started to be driven when the power source is turned on, is guided to the ejector 51 via the pipe lines 49 and 50, and is, for example, -600 mmHg.
Generates a degree of negative pressure. However, the ejector 51
Since the on-off valve V6 is closed, the negative pressure generated in (3) is not guided to the vaporization chamber 28, and only the air is supplied to the gas sensor 53 by the compressed air via the conduit 57. Therefore, the output s1 of the gas sensor 53 is kept at a relatively low level as compared with the state in which the vaporized gas of the fuel oil is supplied.

The compressed air from the compressed air pressure source 48 is discharged from the nozzle 41 via the pipes 49 and 56,
The vaporization of the fuel oil in the vaporization chamber 28 is promoted, and the vaporized gas of the fuel oil stays below the top plate 39. Thus
Even if the suction operation is continuously started, air is previously discharged from the nozzle 41 to vaporize the fuel oil so that the oil liquid in the vaporization chamber 28 is not sucked.

In such a state, a predetermined time W1,
For example, when W1 = 5 to 10 seconds has elapsed, the oil type determination circuit 54 outputs the control signal s4 to open the on-off valve V6 at time t2 as shown in FIG. 4 (2). Therefore, the negative pressure generated in the ejector 51 is introduced into the vaporization chamber 28 through the pipe line 55, and the suction operation of the gas that has been vaporized in advance is started as described above. The compressed gas supplied from the path 50 is mixed and diluted, and the diluted gas is supplied from the line 57 to the gas sensor 53.

In this way, when the vaporized gas of the fuel oil in the vaporization chamber 28 is guided to the gas sensor 53, step a
6, the output s1 of the gas sensor 53 is input to the oil type determination circuit 54, and the oil type is determined by performing level discrimination at a determination level corresponding to the oil type preset in the oil type determination circuit 54. . That is, when the storage tank 16 is for kerosene, for example, the oiling pipe 2
If the fuel oil supplied to 0 is kerosene, it is determined that the oil types match, and the process proceeds to step a7, where the oil type determination circuit 54
From the control signal s5, and as shown in FIG. 4 (3), after a predetermined short time W2≈1 second has elapsed, the opening / closing valve V3 of the oiling pipe 20 is opened at time t3,
The fuel oil supplied from the hose 18 is allowed to drop into the storage tank 16, and the unloading and the lubrication are started.

At step a8, the oil type determination circuit 54 continues to detect the presence of the liquid on the basis of the liquid detection signal s2 from the liquid detector S _L, or continues to detect the presence of the liquid, for example, the liquid detection signal s2 is input. Step a5 mentioned above until it disappears
The operation of a7 is repeated. Since the on-off valve V3 is already open at step a7 during this repetition,
This open state will be maintained. Liquid detection signal s
When 2 is no longer input, the process moves to step a9, as shown in FIG.
As shown by, the open / close valve V6 is closed at time t4, and a predetermined time W3 = 1 for cleaning the gas sensor 53 is set.
The operation is performed for 0 to 20 seconds, and as shown in FIG. 4 (1), the opening / closing valve V5 is closed at time t5. In parallel with this, the operator closes the opening / closing valves V1 and V2 of the tank truck 17, and then the hose 18 is disconnected from the oiling pipe 20 in step a10. As a result, the power of the oil type determination means 31 is turned off in step a11, and the opening / closing valve V3 of the oil injection pipe 20 is set in step a12 as shown in FIG. 4 (3).
It is closed at time t6, and the unloading and lubrication work is completed at step a13.

If it is determined in step a6 that the oil type is different, the process proceeds to step a14, in which the oil type determination circuit 54 outputs a notification signal s5 to cause the notification means 33 to perform the notification operation. 4 (2) and (3), the on-off valves V6 and V3 are closed at time t7, and cleaning is performed until time t8 for a predetermined time W4 = 20 to 30 seconds.

At step a16, when the operator confirms the on-off valve V1 of the tank lorry 17 or determines that the oil types are the same due to odor, etc., step a17
When the release signal s7 is input to the oil type determination circuit 54 by operating the input means 34, the oil type determination circuit 54 outputs the control signal s4 to open / close as shown in FIG. 4 (2). After the valve V6 is closed and the gas sensor 53 is cleaned as described above, at time t8, as shown in FIG. 4C, the control signal s6 is output to output the on-off valves V3 and V6.
Is opened to allow resumption of the lubrication and oil type detection operations, the notification signal s5 to the notification means 33 is cut off in step a18, and the process returns to step a8.

When it is confirmed in step a16 that the oil type is different by the operator's confirmation work,
Move to step a19, and open / close valve V1 of tank truck 17
After closing the valve, the open / close valve V3
When the valve is closed, the oil mixture has already occurred in the storage tank 16, so at step a20, the input means 34 is operated to forcibly open the open / close valve V3, so that the supply direction is higher than the open / close valve V3. The fuel oil existing in the oil supply pipe 20 and the hose 18 on the upstream side of A is dropped into the storage tank 16. Thus, the notification operation of the notification means 33 is stopped in step a21, and the process returns to step a10.

The mixed oil dropped in the storage tank 16 is collected in another tank truck, brought back, and processed. However, if a difference in oil type is confirmed before dropping into the storage tank 16, the on-off valve V3 is not opened,
The fuel oil existing upstream of the on-off valve V3 of the hose 18 and the oil supply pipe 20 in the supply direction A is drained from an oil discharge port (not shown) provided immediately upstream of the on-off valve V3.

In this way, the oil type determination operation is continuously performed until the hose 18 of the tank truck 17 is connected to the oiling pipe 20 and then unloading is completed and the hose 18 is removed from the oiling pipe 20. Alternatively, since it is repeated intermittently, it is possible to detect the difference in oil type early. With such a configuration using the gas sensor 53, 1% is added to kerosene or light oil.
The above mixture of gasoline can be detected, and the oil type can be determined with high accuracy.

FIG. 5 is a sectional view showing the concrete construction of the sampling means 35a according to another embodiment of the present invention. The sampling means 35a of the present embodiment includes a housing 6 that communicates with the lubrication pipe 20 via an inflow path 29 and an outflow path 30.
0, and the housing 60 is provided with a substantially straight cylinder-shaped tubular body 61 that constitutes the vaporization chamber 28. The tubular body 61 has an opening at the bottom and faces the opening to the housing 60. Is provided with a substantially spherical foaming device 63 as a forced vaporizing means made of a porous material. Compressed air from the compressed air pressure source 48 is supplied to the foaming device 63,
It is configured to emit fine bubbles from all surfaces.

By generating such fine bubbles, the vaporization of fuel oil can be further promoted and the vaporization efficiency of fuel oil can be improved. Further, the fuel oil flowing into the housing 60 from the inflow passage 29 as indicated by the arrow 64 contacts the wall 65 near the lower end of the tubular body 61, and stagnates near 66 below the open end of the tubular body 61. Therefore, it is possible to prevent the fuel oil from coming into contact with the foam body 63 at a high flow rate, so that the foam generated from the foam body 63 is prevented from coming into contact with the cylindrical body 61.
To promote the vaporization of the fuel oil.
Further, the float valve V4 is spherical in this embodiment, and in a state where no fuel oil exists in the housing 60 and the cylinder 61, the foam 63 and the housing 60 are provided below the cylinder 61.
It is not necessary to hold the float valve V4 in the vicinity of the valve hole 68 because the valve hole 68 can be closed as the oil level rises without coming into contact with the bottom plate 67 or the like and being pulled out to the outside.

With such a structure, the cylindrical body 61 is also provided.
The vaporized gas of the fuel oil generated in the vaporization chamber 28 can be guided from the ejector 51 to the gas sensor 53 to determine the oil type.

FIG. 6 is a sectional view showing a concrete structure of the sampling means 35b according to still another embodiment of the present invention.
The sampling means 35b of the present embodiment has a pipe 80 through which the compressed air from the compressed air pressure source 48 is branched and guided, and a check valve V8 is interposed in this pipe 80 to serve as a forced vaporization means. It is connected to the ejector 70. The ejector 70 is configured to suck the fuel oil in the oil supply pipe 20 through the inflow passage 29 having the filter 71 attached to the tip end thereof, and discharge the fuel oil together with the compressed air from the pipe passage 73 into the housing 74. . Therefore, a part of the fuel oil in the oil injection pipe 20 taken in from the inflow passage 29 is vaporized in the ejector 70, and the fuel oil in the vaporization chamber 28 of the housing 74 is vaporized by the air discharged from the pipe 73. The vaporized gas of the fuel oil having a high concentration can be obtained.

FIG. 7 is a cross-sectional view showing the sampling means 35c according to the second embodiment of the present invention. In addition,
The parts corresponding to those of the embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals. The sampling means 35c of this embodiment is
There is a single flow path 76 for taking in a part of the fuel oil in the oil injection pipe 20 and discharging a part of the taken fuel oil. In this flow path 76, a housing 77 constituting the vaporization chamber 28 is provided. Are integrally formed. Inside the oil injection pipe 20, there is provided a nozzle 78 as a pushing vaporization means for injecting the compressed air supplied from the compressed air pressure source 48 through the pipe 56 so as to face the flow path 76. The fuel oil in the oil injection pipe 20 is pushed into the vaporization chamber 28 via the flow path 76 and vaporized by the air injected from the nozzle 78. By forming the single flow path 76 in this way, only one opening is formed in the oil supply pipe 20, and it is possible to prevent the strength of the oil supply pipe 20 from decreasing and to simplify the configuration. You can

In the above embodiment, the storage tank 16 in which kerosene and light oil having a relatively low vapor pressure should be unloaded and refueled.
In the above, I explained about when regular gasoline or high-octane gasoline with a relatively high vapor pressure is mixed.
Regardless of whether kerosene or light oil is mixed in the storage tank 16 to be filled with regular gasoline or high-octane gasoline, the difference in oil type is detected and the opening / closing valve V3 of the oil filling pipe 20 is closed. It is possible to reduce the amount of fuel oil of different oil types injected into the storage tank 16 as much as possible, and when the on-off valve V3 is not installed, only the alarm by the notifying means 34 is issued. The operator who receives the alarm may close the opening / closing valves V1 and V2 of the tank truck 17. Further, since kerosene and light oil have almost the same vapor pressure, it is impossible to distinguish them in the above-mentioned embodiment, but since coumarin is generally mixed in kerosene as an identifying agent, it is irradiated with ultraviolet rays of a specific wavelength. Both can be distinguished by confirming the fluorescence reaction. Therefore, by installing this determination method together, it is possible to determine gasoline, kerosene, and light oil.

[0038]

According to the present invention as set forth in claim 1, a part of the fuel oil in the oil injection pipe is guided to the sampling means and is forcibly vaporized by the forced vaporization means, and the oil type is based on the vaporized gas. Since the oil type of the fuel oil flowing in the oil injection pipe can be continuously determined, the mixed oil at the time of unloading and oil injection can be detected early and surely and stored in the storage tank. It is possible to reduce the inflow amount of fuel oil having different oil types as much as possible.

According to the second aspect of the present invention, a part of the fuel oil in the oil supply pipe is introduced while being vaporized by the injecting vaporizing means to the sampling means, and the oil type is determined based on the gas. The mixed oil at the time of unloading and lubrication can be detected early and reliably. Further, since a single flow path through which a part of the fuel oil in the oil injection pipe can flow in and out is formed to guide a part of the fuel oil into the vaporization chamber, the opening formed in the oil injection pipe is Just one,
It is possible to prevent a decrease in the strength of the oil supply pipe and simplify the structure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the overall configuration of an embodiment of the present invention according to claim 1.

FIG. 2 is a system diagram showing a specific configuration of an oil type determination means 31 and a sampling means 35 shown in FIG.

FIG. 3 is a flowchart for explaining an oil type determination operation of the embodiment shown in FIGS. 1 and 2.

FIG. 4 is a timing chart showing opening / closing operations of opening / closing valves V5, V6, and V3.

FIG. 5 is a sampling means 35a according to another embodiment of the present invention.
It is sectional drawing which shows the concrete structure of this.

FIG. 6 is a sectional view showing a specific structure of a sampling means 35b according to still another embodiment of the present invention.

FIG. 7 is a sectional view showing a sampling means 35c according to an embodiment of the present invention as set forth in claim 2;

FIG. 8 is a simplified diagram of a typical prior art.

[Explanation of symbols]

15 Roadbed 16 Storage tank 17 Tank lorry 18 Hose 20 Oil supply pipe 21 Lorry tank 28 Vaporization chamber 29 Inflow path 30 Outflow path 31 Oil type determination means 33 Notification means 34 Input means 35, 35a, 35b, 35c Sampling means 41, 78 Nozzle 48 Compression Air pressure source 51,70 Ejector 53 Gas sensor 54 Oil type judgment circuit 63 Foamer 76 Dividing channel S _L Liquid detector V1, V2, V3, V5, V6 Open / close valve V4 Float valve V7 Check valve s1 Gas sensor 53 output s2 Liquid detection Signal s3, s4, s6 Control signal s5 Notification signal s7 Release signal

Claims (2)

[Claims] 1. A storage tank buried underground, a lubrication pipe extending from the storage tank to the ground and supplied with fuel oil to be lubricated, and a part of the fuel oil flowing in the lubrication pipe from an inflow path. Sampling means for taking in and discharging the taken-in fuel oil from the outflow passage to the downstream side of the inflow passage of the oil injection pipe; and a forced vaporization means for supplying air to the fuel oil guided to the sampling means, The vaporized gas of the fuel oil in the sampling means is introduced, and the oil type determination means determines the oil type based on this gas, and the oil type determination means responds to the output from the oil type determination means. An oil blending determination device for a storage tank, comprising: a notification unit that issues an alarm when it is determined that there is a difference. 2. A storage tank buried underground, an oiling pipe extending from the storage tank to the ground and supplied with fuel oil, and a part of the fuel oil flowing in the oiling pipe is taken in from a single flow path. , Sampling means for discharging the fuel oil taken in from the flow path, and a nozzle for injecting air toward the flow path in the oil injection pipe, and the inside of the oil injection pipe by the air injected from the nozzle Pushing vaporization means for pushing a part of the fuel oil into the sampling means while vaporizing it, gasified gas of the fuel oil in the sampling means is introduced, and oil type determination means for determining the oil type based on this gas, An oil mixture determination device for a storage tank, comprising: a notification unit that issues an alarm when the oil type determination unit determines that the oil type is different in response to the output from the oil type determination unit.