JP2524949B2 - Method and device for preventing oil mixture during lubrication - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for preventing oil mixture during oiling, and more particularly, to prevent oil of a different type from the oil in an underground tank when oiling from a tank truck to an underground tank such as a gas station. To a method and a device therefor.

[0002]

2. Description of the Related Art The types of oil handled at gas stations are regular gasoline, premium gasoline, diesel oil and kerosene, and the difference between the physical and chemical properties of oil is used to distinguish these four types of oil. It is possible. The properties that can be used are boiling point, refractive index, permittivity, vapor pressure, light transmittance, etc. Which property is used, the four types of oil can be identified automatically and quickly and surely. It is unclear whether or not it is possible to prevent this, so the present situation is that it depends on the visual confirmation by the lubrication operator.

[0003]

However, under the present circumstances where artificial confirmation is used, different oil types may be mistakenly injected, and if the wrong oil type is used, the credit of the gas station may be lost. However, because kerosene mixed with gasoline was used for the heater, there was a drawback such as a fire and loss of human life.

The present invention is designed to eliminate the above drawbacks.

[0005]

The method for preventing oil mixture during oil injection according to the present invention is to guide the oil supplied to an oil injection pipe having a normally closed valve into an evaporation container to be vaporized and to measure the light transmittance. The difference between the light transmittance of the oil introduced into the light transmittance measuring means is the difference between the vapor pressure of the oil vaporized in the vaporization container and the gasoline other than gasoline .
Since it is above the level of 1, it is suitable for kerosene and non-kerosene.
Identify and above a second level lower than the above first level
Therefore, regular gasoline and premium gasoline are distinguished from each other, and the normally closed valve is opened in the case of a desired oil type.

The oil mixing prevention device for oil injection of the present invention comprises a pressure vessel and light transmittance measuring means into which oil supplied to an oil injection pipe having a normally closed valve is introduced, an oil vaporization vessel, and this vaporization. A means for supplying the oil in the pressure vessel to the vessel, a pressure detection means for detecting the pressure in the vaporization vessel, and a gasoline for discriminating other than gasoline obtained from the pressure detection means.
Kerosene and other than kerosene obtained by the force and light transmittance measuring means
And regular gasoline and premium gasoline
It is characterized by comprising means for determining the oil type from the output for identification and means for opening the normally closed valve when the desired oil type is obtained.

In the oil mixture prevention device at the time of oil injection, the oil supplied to the pressure vessel, the vaporization vessel, and the light transmittance measuring means is supplied by the oil flowing through the oil injection pipe when the normally closed valve is opened. Means can be provided for restoring the lubrication pipe by the resulting siphon action.

[0008]

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

As a result of various experimental studies, the inventor of the present invention has realized reliable and reliable by combining two identification methods of the difference in vapor pressure (difference in gas concentration) of various oils and the difference in light transmittance at a specific wavelength. It was found that highly effective oil type identification can be done economically.

That is, the vapor pressure of gasoline is 0.3 at 20 ° C.
Although it is about kg / cm ² , the vapor pressures of kerosene and light oil, which are non-volatile oils, are so low that they can be ignored at 0.01 kg / cm ² or less, and gasoline and kerosene / light oil can be distinguished by the difference in vapor pressure.

Regarding the light transmittance, the relationship between the wavelength measured by an ultraviolet / visible spectrophotometer and the light transmittance of oil is as shown in FIG. 1, kerosene has a wavelength of 450 nm or less, and gasoline and light oil have a wavelength of 620 nm or less. However, the light transmittance of green light having a wavelength of 550 nm is 100% for kerosene and 82-88 for light oil, as is clear from FIG.
% For regular gasoline and 50% for premium gasoline. Therefore, the four kinds of oil can be identified by the light transmittance.

However, there are some cases where the difference in light transmittance between regular gasoline and light oil is several percent, and moreover, light oil has a stronger color tone and a lower light transmittance with the passage of time. As described above, the light transmittance of light oil varies considerably, and some light oil has a light transmittance lower than that of regular gasoline. Therefore, it is better to avoid distinguishing regular gasoline from light oil by light transmittance.

FIG. 2 is an explanatory view of an oil mixture preventing device for oil injection according to the present invention, in which 1 to 4 are oil type oil supply pipes connected to an underground tank storing different types of oil, and 5 ~ 8
Is a normally closed valve connected to the inlets of the oiling pipes 1 to 4, 9
-12 are the above-mentioned lubrication pipes 1-4 through the normally closed valves 5-8.
To the siphon pipes 13 to 16 respectively inserted into the lubrication hose connection pipes 9 to 12, and 17 to 20 oil introduction pipes connected to the siphon pipes 13 to 16, respectively. 21 to 24 are the oil introducing pipes 17
To 20 respectively, 25 is a branch pipe commonly connected to the oil introducing pipes 17 to 20 via the on-off valves 21 to 24, and T1 is an oil supply source such as a tank truck (not shown). No.) below, the lubrication hose connection pipes 9 to 1
2, the lower opening of which is located above the branch pipe 25.
Is a vaporization container whose lower outlet opening is also connected to the branch pipe 25 through an oil discharge valve 26, and T3 is below the tank truck and above the pressure container T1. The sump container located at, T4 is a hot water supply tank.

The pressure vessel T1 has a lower opening 27.
And a compressed air introduction valve 28 connected to the upper opening thereof and an air discharge pipe 29 of a predetermined length inserted inside from the upper portion thereof.
An air vent valve 30 that allows only air to pass through is connected to the air exhaust pipe 29.

The vaporization container T2 has an oil injection nozzle 31 inserted therein, a hot water spiral pipe 32, a pressure switch 33 connected to the upper portion thereof, and an air introduction valve 34.

The lower opening 27 of the pressure vessel T1 is connected to the oil injection nozzle 31 via an on-off valve 35, and directly to the inlet of a liquid passage type cell 36 located below the pressure vessel T1. It is connected.

The outlet of the liquid passage type cell 36 is connected to the lower opening of the oil reservoir T3, and the liquid passage type cell 3 is connected.
A light projector 37 and a light receiver 38 are respectively arranged on both sides of a line passing through the oil passage in 6. The light receiver 38 has voltage level switches L1 and L1, which are opened and closed with different output voltages, respectively.
2 is connected.

The oil sump container T3 includes a float 39,
A switch 40 opened and closed by the float 39,
And an air vent valve 41 that allows only air to pass through.

The hot water supply tank T4 is connected at its upper and lower parts to both ends of the hot water coil 32 via a circulation pump 42, and has a water supply float valve 43, a temperature control thermistor 44, and an electric heater. 45 and.

Reference numeral 46 denotes the lubrication hose connecting pipes 9 to 1
Tank lorry (not shown) connected to any of the two
It is a lubrication hose from.

Since the method and apparatus for preventing oil mixture at the time of lubrication according to the present invention have the above-mentioned structure, regular gasoline, premium gasoline, kerosene, and light oil can be distinguished from each other as follows.

(A) The lubrication hose 46 is connected to one of the lubrication hose connection pipes 9 to 12 for the type of oil to be lubricated, for example, 9.

(B) Open the valve of the tank truck to open the oil type switch, for example, the on-off valve 21.

(C) As a result, when the oil in the tank truck flows into the oil introducing pipe 17 by gravity, the air in the pressure vessel T1 is discharged from the air vent valve 30 to the outside, and the oil flows in the oil introducing pipe 17. It passes through and enters the pressure vessel T1.

(D) At the same time, the oil in the tank lorry enters the liquid passage type cell 36 through the pressurized container T1 by its own weight, further enters the oil reservoir container T3, floats the float 39, and turns on the switch 40. Nishi control panel (not shown)
Turn on the control power of. The air in the oil sump container T3 is discharged from the air vent valve 41.

(E) When the control power is turned on, first the on-off valve 21 inserted in the oil introduction pipe 17 is closed, then the compressed air introduction valve 28 and the on-off valve 35 are opened, and the inside of the pressurized container T1 is closed. Compressed air flows into the chamber and the compressed air flows into it, for example, at 0.35 kg / cm ²
As a result, the pressure vessel T1 is pressurized via the on-off valve 35.
The oil inside is pumped into the vaporization container T2.

(F) The set pressure of the pressure switch 33 is, for example, 0.3 kg / cm ² , and the temperature inside the vaporization container T2 is 40.
It is said to be ℃.

(G) The pressurized oil in the pressure vessel T1 is atomized from the oil injection nozzle 31 into the vaporization vessel T2, and when the oil is gasoline, the vaporization vessel T2 takes about 5 seconds.
When the internal pressure becomes 0.3 kg / cm ² or more, the pressure switch 33 is activated to generate an output signal, and as a result, the opening / closing valve 35 is closed and the oil injection is stopped.

When the oil is light or light oil, the pressure container T1 is used.
The oil is injected into the vaporization container T2 until the oil level in the inside lowers and moves away from the lower end opening of the air discharge pipe 29. The length of the air discharge pipe 29 in the pressurized container T1 is determined so that this injection amount becomes about 1/15 of the actual volume of the vaporization container T2. In the case of kerosene and light oil, the air volume decreases by the amount of oil accumulated in the vaporization container T2, so the internal pressure rises but the pressure is 0.1 kg.
/ Cm ² or less, the pressure switch 33 does not operate, and the air vent valve 30 is filled with oil even when the oil level in the pressurized container T1 is separated from the lower end opening of the air discharge pipe 29, Since this oil does not escape during the pressurization, the compressed air in the pressure vessel T1 is not discharged to the outside.

(H) On the other hand, the oil of the liquid-passing type cell 36 is irradiated with the light of the light projector 37, and the light amount reduced by the absorption of the oil is output from the light receiver 38 as a signal voltage, and the output voltage is set. It is detected by two voltage level switches L1 and L2 having different values.

(I) When the combination of the signals of the pressure switch 33 and the voltage level switches L1 and L2 matches the set one, this is judged by the judging means (not shown), the compressed air introducing valve 28 is closed, and The normally closed valve 5 of the oil pipe 1 is opened to start the lubrication to the underground tank, the oil in the container T3 returns to the container T1 by its own weight through the lower opening 27, and at the same time, the air introduction valve 34 and the oil discharge valve 26 are opened. , Containers T1, T
The oil in 2 flows into the underground tank by the siphon action of the siphon pipe 13.

That is, since the tip of the siphon pipe 13 in the oil supply hose connection pipe 9 is oriented in the oil flow direction, the tip portion of the oil flowing from the oil supply hose 46 through the oil supply hose connection pipe 9 into the underground tank. Since it becomes negative pressure due to the flow velocity of
The oil in the containers T1, T2 and thus T3 is quickly drained. Until the lubrication is completed, the air in the vaporization container T2 is replaced with air by sucking air from the air introduction valve 34.

(J) When the signal combinations do not match, the normally closed valve 5 of the oil supply pipe 1 is not opened and an alarm is issued.

As is apparent from FIG. 1, a suitable light source for discriminating the oil type based on the light transmittance is monochromatic light having a wavelength of around 500 nm. Further, a green or blue LED (light emitting diode) that can obtain a desired monochromatic light without a filter is optimal as a light source.

Table 1 is an experimental example showing the relationship between the output voltage of the light receiver 38 and the oil type.

[0036]

[Table 1]

In the experiment of Table 1, the light receiver 38 is green L
A transmissive optical sensor switch composed of an ED is used, and a cylindrical cell having an optical path length of 150 mm is used as the liquid passage type cell 36.

Table 2 shows combinations of the output signals from the voltage level switches L1 and L2 and the output signal of the pressure switch 33. That is, depending on whether the pressure switch 33 outputs,
It can be identified as something other than sorin and gasoline, and
Depending on the output from switch L1, for example, the output of 7V or more
Therefore, it is possible to distinguish kerosene and non-kerosene, and
Voltage level switch L2 lower than the output of the switch L1
Regulated by the presence or absence of output of, for example, 5V or more
-Be able to distinguish between gasoline and premium gasoline .

[0039]

[Table 2]

[0040]

As described above, in the method and apparatus for preventing oil mixing during lubrication of the present invention, the oil type is identified by the difference between the vapor pressure of the oil and the light transmittance. Can be identified, and its reliability is extremely high, which is a great benefit.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the wavelength of light and the light transmittance of each oil type.

FIG. 2 is an explanatory diagram of an oil mixing prevention device at the time of lubrication according to the present invention.

[Explanation of symbols]

 1 lubrication pipe 2 lubrication pipe 3 lubrication pipe 4 lubrication pipe 5 normally closed valve 6 normally closed valve 7 normally closed valve 8 normally closed valve 9 lubrication hose connection pipe 10 lubrication hose connection pipe 11 lubrication hose connection pipe 12 lubrication hose connection pipe 13 siphon Pipe 14 Siphon pipe 15 Siphon pipe 16 Siphon pipe 17 Oil introduction pipe 18 Oil introduction pipe 19 Oil introduction pipe 20 Oil introduction pipe 21 Open / close valve 22 Open / close valve 23 Open / close valve 24 Open / close valve 25 Branch pipe 26 Oil discharge valve 27 Lower opening 28 Compression Air inlet valve 29 Air outlet pipe 30 Air vent valve 31 Oil injection nozzle 32 Hot water pipe 33 Pressure switch 34 Air inlet valve 35 Open / close valve 36 Liquid through cell 37 Light projector 38 Light receiver 39 Float 40 Switch 41 Air vent valve 42 Circulation pump 43 Water supply Float valve 44 Temperature control thermistor 45 Electric heater 46 Lubrication hose T1 Vessel T2 vaporization vessel T3 oil reservoir T4 hot water supply tank L1 voltage level switch L2 voltage level switch

Claims (3)

(57) [Claims] 1. A vapor of oil vaporized in the vaporization container, which is introduced into the vaporization container to vaporize the oil supplied to the oiling pipe having the normally closed valve and to be introduced into the light transmittance measuring means. Distinguish between gasoline and non-gasoline based on pressure difference
And, except kerosene and kerosene from the difference in light transmittance of the oil introduced into the light transmittance in the measuring unit is a first level or higher
The second level lower than the first level above.
Regular gasoline and premium because it is more than
A method for preventing oil mixture at the time of oil injection, characterized in that gasoline is identified and the normally closed valve is opened in the case of a desired oil type. 2. A pressurizing container into which oil supplied to an oiling pipe having a normally closed valve is introduced, a light transmittance measuring means, an oil vaporizing container, and an oil in the vaporizing container. Means for supplying the gas, pressure detecting means for detecting the pressure in the vaporization container, and gasoline and gasoline obtained from the pressure detecting means.
The output that identifies the outside thing and the kerosene and non-kerosene obtained by the above-mentioned light transmittance measuring means and the regular gasoline
An oil mixing prevention device at the time of lubrication, which comprises means for determining an oil type from an output for identifying premium gasoline and means for opening the normally closed valve when a desired oil type is obtained. 3. The pressure vessel, the vaporization vessel, and the oil supplied to the light transmittance measuring means are supplied to the oil supply pipe by a siphon action generated by the oil flowing through the oil supply pipe when the normally closed valve is opened. The oil mixing prevention device at the time of lubrication according to claim 2, further comprising means for returning the oil.