JPH0777916B2 - Unloading oil mixture prevention device - Google Patents

Description

[Detailed Description of the Invention] (a) Field of industrial application This application prevents erroneous lubrication to a storage tank at a place where a plurality of types of liquids having different vapor pressures are handled, for example, at a gas station that stores and supplies gasoline and light oil. Regarding the device.

(B) Conventional technology and its problems At filling stations, workers carefully check the type of oil during lubrication.

This is because if oils of different oil types are mixed, a large amount of oil becomes unusable, and if the vehicle is unknowingly refueled, engine trouble will occur.

However, as long as the confirmation work is done by humans, accidents due to pocket mistakes cannot be avoided. Therefore, the applicant of the present application has already disclosed in JP-A-63-550 as a device for preventing erroneous lubrication of a storage tank.
Proposals have been made for devices such as 97 and Japanese Patent Laid-Open No. 63-44497 that determine the oil type based on the specific gravity of the oil and prevent accidental oil injection.

However, these devices had a problem that the floats needed to be large in order to distinguish oils (gasoline 0.74, light oil 0.83) having relatively close specific gravities, and the devices became large in size.

(C) Configuration and action to solve the problem The present application is based on the difference in vapor pressure due to the difference in oil type, that is, due to the difference in mixing ratio of volatile components, it is relatively small but surely oil type. It is an object of the present invention to provide a device capable of determining the above, and a structure and an operation of the invention of claim (1) include a means for providing a lubrication valve in the middle of the lubrication pipe and creating a closed chamber for confining the oil on the coupling side thereof. The main constituent elements are the means for stirring the oil, the means for measuring the pressure value, and the means for determining the oil type.Agitating the oil trapped in the closed chamber promotes the vaporization of volatile components in the oil. Therefore, the internal pressure of the closed chamber rises according to the mixing ratio of the volatile components.

Then, the type of oil is determined based on the increased pressure value, and the oil injection valve that matches the type of oil in the tank is allowed to open.

The structure and operation of the invention of claim (2) is that an oil supply valve is provided in the middle of the oil supply pipe, and a bypass passage provided with a measurement chamber is provided on the coupling side of the oil supply pipe, bypassing a part of the oil supply pipe, and stirring the oil Means, a means for closing the bypass passage above the measuring chamber, a means for measuring the vaporization value, and an oil type determination means, which are the main components, and when the oil is agitated after the bypass passage is closed, Volatile components in the oil are vaporized according to the mixing ratio and are accumulated above the measuring chamber.

The oil type is determined based on the amount of gas generated, that is, the vaporization value, and if the oil type matches the oil type in the tank, the opening of the oil injection valve is permitted.

The structure and the operation of the invention of claim (3) are as follows: An oil supply valve is provided in the middle of the oil supply pipe, a means for creating a closed chamber for confining the oil on the coupling side, a means for stirring the oil, and a vaporization value are measured. The main components are a means, a gas chamber in which gas remains in communication with the closed chamber, and an oil type determination means.When the oil trapped in the closed chamber is agitated, the volatile components in the oil are mixed. It vaporizes according to the ratio and accumulates above the closed chamber while increasing the internal pressure.

This means that the gas space above the closed chamber is expanded, while the gas space inside the air chamber is contracted.Based on the measured value of the gas space volume above the closed chamber or the gas space volume in the air chamber, that is, the vaporization value, The type of oil is determined in the above, and if it matches the type of oil in the tank, the opening of the lubrication valve is permitted.

(D) Embodiment FIG. 1 shows a conventional oil storage system in which no oil mixing prevention measures are taken. Reference numeral 1 denotes a tank for storing oil, a fuel gauge 2, an oil absorption pipe 3 connected to an oil supply device (not shown), and one A ventilation pipe 4 having an end open to the atmosphere and an oiling pipe 6 having a coupling 5 installed at one end are provided.

Reference numeral 7 is a tank for a tank truck, 8 is a main valve, 9 is a coupling on the truck side, and 10 is a hose for lubrication.

In FIG. 2A, the lubrication pipe 6 is divided into an upper pipe 12 and a lower pipe 13 by a lubrication valve 11, and the upper pipe 12 is separated by a isolation valve 14 into a closed chamber.
It is connected to 15.

16 is a sensor that detects the pressure in the closed chamber 15, and 17 is a stirring motor that drives the impeller 18.

In FIG. 5 showing the operation panel 19, 20 and 21 are a start switch and an end switch, respectively, which are operated to perform the operations described later.

Reference numeral 22 is an oil no-notification device, which informs by light that there is no oil to be inspected.

Reference numeral 23 denotes an erroneous oil type alarm, which notifies by light when it is determined that the oil type is incorrect.

Reference numeral 24 denotes a speaker, which emits a sound in response to the notification operation of the oilless alarm 22 and the erroneous oil type alarm 23 to notify the user.

In FIG. 6A, 25 is a clock signal generation circuit for outputting a clock signal c, and 26 is a time set by a stirring time setting circuit for setting the driving time of the stirring motor 17 (for example, 5
The time signal a indicating the second) is output.

The agitator motor control circuit 27 performs the following operations.

When the start switch 20 is operated and the start signal s is input, the determination start signal b (one pulse) is output immediately.

Start counting by counting the clock signal c,
The drive signal d is output during the time indicated by the time signal a to drive the stirring motor 17 to rotate.

When the timing of the time signal a is completed, the output of the drive signal d is stopped and the determination start signal e (one pulse) is output.

28 is an oil presence determination circuit that determines whether or not oil is present in the closed chamber 15 based on the torque (detected from the startup current) when the stirring motor 17 is started. In addition to outputting f to notify the oilless alarm 22, the determination permission signal h is output when it is present.

Reference numeral 29 is a comparison value setting circuit. When the tank 1 is for gasoline, the A value in FIG. 7A is set, and for light oil, the B value is set. Either value is output as the comparison value signal i. ing.

An oil type determination circuit 30 compares the value of the pressure signal j output from the sensor 16 with the value of the comparison value signal i on condition that the determination permission signal h is followed by the determination start signal e. When the tank 1 is for gasoline, the value of the pressure signal j exceeds the A value, and for light oil, it does not exceed the B value. The lubrication permission signal k (one pulse)
If it is not, 31 is a lubrication valve control circuit that outputs an alarm signal m and gives it to the erroneous oil type alarm 23. When the lubrication permission signal k is input, the valve opening signal n is output to output the lubrication valve. 11 is opened, and when the end signal r output from the end switch 21 is input, the valve opening signal n is extinguished and the lubrication valve 11 is closed.

32 is an isolation valve control circuit, which receives the start signal s and closes the valve p
Is output to close the isolation valve 14, and when the lubrication permission signal k or the end signal r is input, the closing valve p is extinguished and the isolation valve 14 is closed.
To open.

Figure 7A shows the pressure change caused by the difference in the proportion of the volatile components contained in the oil when it is agitated in a hermetically sealed state, and when the vapor pressure value is high, such as gasoline, which contains a large amount of volatile components, it is about 300 mmHg. The pressure rises, and there is little volatile component such as light oil and kerosene, and it hardly rises when the vapor pressure value is 3 mmHg or less.

The first embodiment of the invention of claim (1) will be described based on the above-described FIGS. 2A, 5, 6A and 7A.

First, the hose 10 is connected to the coupling 5 so that the oil flows into the oiling pipe 6.

At this time, since the oil supply valve 11 is closed, the inside of the upper pipe 12 is filled with oil and does not flow into the tank 1 through the lower pipe 13.

Since the isolation valve 14 is open, the inflow of oil into the closed chamber 15 is allowed.

Next, when the start switch 20 is operated, first the isolation valve control circuit
Since 32 outputs the valve closing signal p and the isolation valve 14 is instantly closed, the closed chamber 15 is kept airtight while holding the inflowing oil.

On the other hand, the stirring motor control circuit 27 drives the stirring motor 17 during the time indicated by the time signal a, and stirs the oil in the closed chamber 15 by the impeller 18.

At the same time, the oil type determination circuit 30 determines whether or not oil is present in the closed chamber 15, and if there is no oil, it is notified through the oil no alarm 22. The signal h is given.

When the judgment permission signal h is given to the oil type judging circuit 30 and the stirring is finished and the judgment starting signal e is inputted from the stirring motor control circuit 27, the pressure signal j from the sensor 16 and the comparison value setting circuit 29 are inputted. When the tank 1 is for gasoline and the value of the pressure signal j exceeds the A value, the oil supply valve control circuit 31 is caused to open the oil supply valve 11 and exceeds the A value. If there is not, the erroneous oil type alarm 23 is notified.

On the other hand, if the tank 1 is for light oil, the oil injection valve 11 is opened on condition that the value of the pressure signal j does not exceed the B value.

The isolation valve 14 is opened at the same time when the oil injection valve 11 is opened.

Moreover, when no oil notification or erroneous oil injection notification is made, the end switch 21 is operated to operate the oil presence judgment circuit 28 and the oil type judgment circuit 30.
Is reset and the isolation valve 14 is opened, so the drain valve 33 shown by the broken line in Fig. 2A is opened to drain and collect the oil in the upper pipe 12 and the closed chamber 15, and then return to the first procedure to perform the lubrication work. You can do it.

When the lubrication work is completed, operate the end switch 21 to operate the lubrication valve.
Close 11 and move to the next tank.

FIG. 2B shows a second embodiment of the invention of claim (1), in which a part of the upper pipe 12 is used as a closed chamber 15 by installing an isolation valve 14 above the oil injection valve 11, Sensor 16
And the stirring motor 17 are installed, and the operation and effect are the same as those of the first embodiment, so detailed description thereof will be omitted.

Next, the inventions of claims (2) and (3) will be described. The same function parts as those of the invention of claim (1) are represented by the same names and the same reference numerals, and the duplicated description thereof will be omitted. .

In FIG. 3A, 34 is a bypass passage that bypasses a part of the upper pipe 12, and in the middle of which a isolation valve 14 is located below the measurement chamber 35.
The measuring chamber 35 is provided with a motor 17 and a liquid level sensor 36 such as a capacitance type (which detects the vaporization value of oil, that is, how much oil vaporizes from the change in the oil level). ing.

Figure 7B shows the state of the oil surface that changes by vaporizing gasoline when light oil is agitated.In the case of gasoline containing a large amount of volatile components, the amount of vaporization is large, so the oil surface changes greatly and volatilizes. In the case of light oil with low content, it changes only slightly.

In FIG. 6A, the comparison value setting circuit 29 has a C value in FIG. 7B when the tank 1 is for gasoline, and a D value when it is light oil.
The value is set, and the set value is output as the comparison value signal r.

Further, the oil level signal w is output from the sensor 36, and the values of the both are compared and judged by the oil type judgment circuit 30.

Next, a first embodiment of the invention of claim (2) will be described with reference to FIGS. 3A, 6A and 7B.

Oil is injected into the upper pipe 12, and the isolation valve 14 is opened at this time, so that the bypass passage 34 and the measurement chamber 35 are filled with oil.

After operating the start switch 20 to close the isolation valve 14 and driving the stirring motor 17 to confirm the presence of oil in the measuring chamber 35, the sensor 16 measures the vaporization state due to stirring as an oil level change, and If the tank 1 is for gasoline and exceeds the C value, the lubrication valve 11 is opened to permit the work. If it is not over, the erroneous lubrication is notified and the lubrication valve 11 is not opened.

On the other hand, if the tank 1 is for light oil, the work is permitted on condition that the D value is not exceeded, and if the D value is exceeded, the work is not permitted.

FIG. 3B shows a second embodiment of the invention of claim (2), which is the same as the first embodiment.
The embodiment is different from the embodiment in that a float valve 37 is used instead of the isolation valve 14, and when the measuring chamber 35 is filled with oil, the float valve 37 automatically rises and closes the bypass passage 34. Since the oil opens when it leaks, the isolation valve control circuit 32 and the isolation valve 14 in FIG. 6A are unnecessary.

Since the operation and effect are the same as those of the first embodiment, detailed description thereof will be omitted.

In FIG. 4A, reference numeral 38 denotes an air chamber made so that gas always remains, which is provided in communication with the closed chamber 15 and has an isolation valve.
When the oil in the closed chamber 15 is agitated after closing 14, the vaporization of the oil is greatly promoted if it is gasoline, and the oil is accumulated above the closed chamber 15.

Here, since the total volume of the closed chamber 15 and the air chamber 38 is constant, the internal pressure rises as a result, and the volume of the residual gas in the air chamber 38 is reduced.

Therefore, as shown by the solid line, the sensor 36 monitors the change in the gas amount or liquid level in the closed chamber 15, or as shown by the two-dot chain line in the sensor 36, the gas amount or liquid level in the air chamber 38 is detected. It is possible to determine that the fuel is gasoline when the change is large over a certain value and is light oil when the change is small by monitoring the change.

This oil type determination is performed by the oil type determination circuit 30, and the value serving as the determination standard is set in the comparison value setting circuit 29.

In addition, the presence or absence of oil in the closed chamber 15 is checked, and the lubrication valve 11 and isolation valve 1
The operation timing of 4 is the same as the inventions of claims (1) and (2).

Here, the sensor 36 employs a sensor that detects the value of the change in the volume of the gas or the change in the oil level. However, these changes are regarded as changes in the pressure as in the invention of claim (1),
It is also possible to determine the type of oil.

FIG. 4B shows the second embodiment of the invention of claim (3), and by installing the isolation valve 14 above the lubrication valve 11,
A part of the upper pipe 12 is used as the closed chamber 15, the sensor 36 and the agitating motor 17 are installed, and the air chamber 38 is formed. The function and effect are the same as those of the first embodiment. Is omitted.

In the above description, a method in which the impeller 18 is rotated by the stirring motor 17 is adopted as the oil stirring means. However, another stirring method and another way of forming the closed chamber are defined in the third aspect of the invention of claim (1). An example is shown below.

In FIGS. 8A, B, and C, a frame 40 is connected to the upper pipe 12, and an oil inflow passage 41 to the inside thereof is formed.

Reference numeral 42 denotes a moving cylinder, which has a cylindrical shape and is a sliding wall of the frame 40
Slides up and down in the figure.

44 is a communication hole formed in the sliding wall 43, and the moving cylinder 42 is
When in the position of FIG. 8A, it is connected to the communication hole 45 formed in the moving cylinder 42.

Reference numeral 46 denotes a cylindrical piston, which slides on the inner wall 47 of the moving cylinder 42, and a pore 48 penetrates in the thickness direction thereof.

49 is an air-driven cylinder, which is fixed to the frame 40 or the upper pipe 12 by a bracket (not shown).
When compressed air is supplied through 50, the rod 51 comes out.

52 is a shaft, a spring plate 53 is fixed to the upper end, and a piston 46 is fixed to the lower end.

54 and 55 are compression springs, 56 is a stopper formed on the shaft 52, 57, 58, 59, 60 and 61 are sealing O-rings, respectively, and 62 is a closing seal.

In FIG. 6B, 63 is a start time setting circuit, which sets the time (for example, 2 seconds) from when the start switch 20 is operated and the start signal s is generated until when it is determined whether or not oil is present. The set value is output as the time signal g.

Reference numeral 64 denotes an oil presence determination circuit, which counts the clock signal c to measure the time, and the time signal g from the input of the start signal s.
After a lapse of time, the oil pressure sensor 16 determines whether or not oil is present based on the value of the pressure signal j output from the pressure sensor 16. If not, an alarm signal f is output to notify no oil. The device 22 is operated, but when it is present, the determination permission signal h (one pulse) is output.

Reference numeral 65 is a comparison value setting circuit, which is the E value or F in FIG. 7C.
A value is set and the set value is output as a comparison value signal i.

An oil type determination circuit 66 determines the oil type by comparing the value of the pressure signal j and the value of the comparison value signal i. When the oil type is the same as that of the tank 1, the oil type permission signal k (one pulse) is used. ) Is output, in the case of a different oil type, a notification signal m is output to operate the erroneous oil type notification device 23, and when the determination is completed, a determination end signal u (one pulse) is output.

67 is a lubrication valve control circuit, which outputs a valve opening signal n by inputting a lubrication permission signal k to open the lubrication valve 11, and when an end signal r is input, causes the valve opening signal n to disappear and closes the lubrication valve 11. .

68 is a switching valve control circuit, which receives the start signal s and switches the switching signal y
Is output, and the output of the switching signal y is stopped when the determination end signal u is input.

A three-way switching valve 69 is provided with a port J to which compressed air is supplied from a compressor (not shown), a port K to which the air pipe 50 is connected, and a port L open to the atmosphere, to which a switching signal y is input. When it is input, port J and port K are connected, and when it is not input, port K and port L are connected.

Subsequently, a series of work operations will be described with reference to FIGS. 6B, 7C, 8A, 8B, 8C.

When the oil is injected into the upper pipe 12, the cylinder 49 and others are in the state shown in FIG. 8A at this point, so that the oil also flows into the moving cylinder 42.

When the start switch 20 is operated, first the port J of the switching valve 69
And the port K are connected to push the rod 51 out of the cylinder 49.

Then, the spring plate 53 is displaced downward against the elasticity of the spring 54, and at this time the spring 55 does not bend, so the moving cylinder 42 starts processing along the sliding wall 43 of the frame 40, and after about 1.5 seconds, the 8B In the state shown in the figure, the closed chamber 15 is formed.

Then, while bending the springs 54 and 55 thereafter, the piston 4
6 starts descending in the moving cylinder 42.

The oil presence determination circuit 64 starts timing at the same time when the start switch 20 is operated, and after 2 seconds, which is the value of the time signal g,
That is, the presence or absence of oil that is symmetrical to make a determination in the closed chamber 15 is confirmed based on the pressure change that occurs immediately after the closed chamber 15 is formed.

This confirmation is made by the change in pressure detected by the sensor 16 in the closed chamber 15 after passing the point marked N in FIG. 7C, in other words when the piston 46 begins to descend.

This is because when oil is present in the closed chamber 15 and the piston 46 descends, the oil escapes to the upper chamber 71 side through the pores 48, but when the passage resistance value at this time is gas and oil. The difference is very different, and therefore, the phenomenon that the pressure change becomes large when oil is present on the lower chamber 72 side is used.

When the presence of oil is confirmed and the piston 46 further descends,
Along with this, the oil in the lower chamber 72 is blown up to the upper chamber 71 and becomes a substantially agitated state. If the oil is gasoline (contains a large amount of volatile components), the pressure change is shown in Fig. 7C. As shown by, the course of large fluctuations is followed, and for light oil (low volatile components), there is little fluctuation as indicated by the light oil curve.

Finally, the stopper 46 comes into contact with the moving cylinder 42 and the piston 46 stops descending in the state of FIG. 8C.

At this time, the tank 1 is for gasoline and the pressure signal j
Once the value of exceeds the E value, it is determined that the oil type is correct.

In addition, when the tank 1 is for light oil, it is determined that the oil type is correct when the value of the pressure signal j does not exceed the F value, and if it exceeds the F value, the oil type is incorrect. judge.

If it is determined that the oil type is correct, the lubrication valve 11 is opened to permit lubrication. After this, the switching valve 69 is switched so that the port K and the port L are communicated with each other, so that the spring plate 53 moves up together with the rod 51 by the action of the spring 54.
Return to the state shown in Figure 8A.

Although the embodiments of claims (1), (2), and (3) have been described above, the following modifications can also be adopted.

Although the starting current value, drive current value or pressure change of the stirring motor is adopted as a method of detecting the presence or absence of oil, a method of directly detecting the presence of oil, for example, a capacitance type or float type sensor Etc. may be provided separately.

In Fig. 7C, G value and H are used as reference values for oil type determination.
A value may be adopted to make the determination based on whether or not the value has exceeded that value after the piston 46 has finished descending, or the rate of change in the sensor output value may be used to make the determination.

In FIG. 5, a start switch and an end switch are provided for each tank, but a ten-key system may be used, and each alarm may be provided for each tank.

In FIGS. 6A and 6B, the lubrication valve 11 is automatically opened when it is determined that the oil type is correct, but the lubrication valve is set to manual and the lubrication valve is unlocked automatically. You may do it. In this case, it is convenient to install means for notifying that the lock has been released.

(E) Effect As described in detail above, the oil is agitated and the amount of volatile components contained in it is detected as a vaporization value (change in pressure, change in gas amount, change in liquid level) to determine the oil type. It is possible to easily and reliably determine gasoline and light oil (including kerosene) having greatly different vapor pressures, which greatly contributes to the prevention of unloading mixed oil.

[Brief description of drawings]

Fig. 1 shows the conventional lubrication system, 2A, B
Both figures show the structure of the closed chamber in the embodiment of the invention of claim (1), and FIGS. 3A and 3B both show the structure of the measurement chamber in the embodiment of the invention of claim (2), and 4A, B The figures are views showing the structure of the air chamber in the embodiment of the invention of claim (3). Fig. 5 shows the outer shape of the operation panel, and Fig. 6A shows the claim (1),
In the electric circuit diagram showing the first and second embodiments of (2) and (3),
FIG. 6B is an electric circuit diagram showing a third embodiment of claim (1). FIG. 7A shows pressure changes of gasoline and light oil in the embodiments of claims (1) and (3), and FIG. 7B shows oil level changes of gasoline and light oil in the embodiment of claim (2). FIG. 7C is a diagram showing pressure changes of gasoline and light oil in the third embodiment of claim (1). FIGS. 8A, 8B and 8C are views showing a process of forming a closed chamber and a stirring method in the third embodiment of claim (1). 1 ... Tank, 2 ... Fuel gauge, 4 ... Vent pipe 5,9 ... Coupling, 6 ... Lubrication pipe 11 ... Lubrication valve, 14 ... Isolation valve, 15 ... Closed chamber 16,36 ...... Sensor, 18 ...... Impeller 35 …… Measuring chamber, 37 …… Float valve 38 …… Air chamber, 40 …… Frame, 51 …… Rod

Claims (3)

[Claims] Claim: What is claimed is: 1. An oiling valve having a coupling at one end and an oiling pipe at the other end opened in the tank, and an oil flowing into the oiling pipe on the coupling side of the oiling valve of the oiling pipe. Based on the measured pressure value, a means to create a closed chamber that shuts off the communication with the coupling, a means to promote vaporization by stirring the confined oil, a means to measure the pressure value in the closed chamber, and a measured pressure value. A unloading oil mixture prevention device comprising: means for determining an oil type; and control means for permitting opening of the oil injection valve on condition that the oil type matches the oil type of the tank. 2. A lubrication valve having a coupling at one end and the other end provided in the middle of an lubrication pipe opened in the tank, and one of the lubrication pipe provided closer to the coupling side than the lubrication valve of this lubrication pipe. Bypass path that bypasses the section and has a measurement chamber, means for closing the upper end of this bypass path, means for promoting vaporization by stirring the oil in the measurement chamber, and means for detecting the amount of vaporized gas And a control means for permitting the opening of the oil injection valve on condition that the oil type is determined based on the detected value and the oil type of the tank concerned. 3. A lubrication valve provided at one end with a coupling, the other end of which is provided in the middle of a lubrication pipe opened in the tank,
A means for creating a closed chamber that traps the oil that has flowed into the oil supply pipe on the coupling side of the oil supply pipe and blocks communication with the coupling, and a gas chamber that communicates with the closed chamber and in which gas remains Means for promoting vaporization by stirring oil, means for detecting the amount of vaporized gas, means for determining the oil type based on this detected value, and on the condition that the oil type in the tank matches A unloading oil mixture prevention device comprising a control unit that permits opening of the oil injection valve.