JPS6234639B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing mix-up of discharged liquids from a multi-chamber tank that individually accommodates liquids of different densities.

BACKGROUND ART Multi-chamber tanks that individually accommodate liquids with different densities, such as gasoline, kerosene, and light oil, are mounted on, for example, vehicles and used for transportation. For example, after reaching the destination, when discharging 4B of the stored liquids 4A, 4B, and 4C from tank 1 as shown in FIG. I operate the operation handle 3B to open 2B of 2A, 2B, and 2C, but
Prior to this, it is confirmed by the display plate 5 on the top or side of the tank 1 whether the liquid 4B stored in that chamber is a predetermined liquid. However, the operator may sometimes misunderstand or operate the operating handle 3C of the chamber C containing a liquid different from the predetermined liquid. This can lead to mistakes, such as when pouring diesel oil into a kerosene tank at a gas station.

In order to prevent this, a density sensor is installed in each chamber to check the liquid density, but the accuracy of the sensor is generally low, and the difference in specific gravity is 0.05g/ gasoline about cm ³ ,
Directly distinguishing between kerosene and diesel oil has the disadvantage of being difficult.

The present invention has been made in order to solve the above-mentioned problems, and provides a device for preventing mix-up of discharged liquids in a multi-chamber tank, with the aim of avoiding operator misunderstandings and erroneous operations when discharging a specified liquid from a tank. The purpose is to provide.

Its features include a pair of pressure sensors installed vertically apart at the bottom of each chamber, a means for detecting the differential pressure between the pressures detected by the sensors, and a means for detecting the liquid density from this differential pressure. A multi-chamber equipped with a density conversion means to seek, a liquid discrimination means for discriminating a liquid corresponding to this density and outputting a signal corresponding to the discriminated liquid, and a relay circuit for displaying the corresponding liquid based on this discrimination signal. This device is a device to prevent mix-up of discharged liquid from a tank, and also includes a pair of pressure sensors installed vertically apart from each other at the bottom of each chamber, a means for detecting the differential pressure between the pressures detected by the sensors, and a means for detecting the difference in pressure detected by the sensors. A density conversion means for determining liquid density from pressure, a liquid discrimination means for discriminating a liquid corresponding to this density and outputting a signal for the discriminated liquid, and a liquid specified by a push switch based on the discrimination signal and a liquid discriminating means. This is a device for preventing mix-up of discharged liquids of a multi-chamber tank, which is equipped with a relay circuit that releases a locking means that locks a bottom valve operating handle of a chamber containing the liquid when the two match.

The present invention will be described in detail below based on examples thereof.

FIG. 2 is an overall system diagram of the device for preventing mix-up of discharged liquids according to the present invention. In addition, in the explanation of each configuration below, those that have the same function for chambers A, B, and C and the liquid gasoline, kerosene, and diesel oil stored therein are indicated by subscripts _A , _B , _C , ₁ , ₂ , and ₃ , respectively. to distinguish them. In the figure, 11 _A , 11 _B , and 11 _C are a pair of pressure sensors installed at the bottom of each chamber A, B, and C with a vertical interval, and 12 _A , 12 _B , and 12 _C are pressure sensors detected by the above sensors. Means for detecting differential pressure from pressure; 13 _A , 13 _B , 13 _C are density conversion means for calculating the density of liquid using this differential pressure; 14 _A , 1
4 _B and 14 _C are liquid determining means for determining which density of the above-mentioned liquids gasoline, kerosene, and light oil corresponds to this density, and outputting a signal corresponding to the determined liquid; 15 _A ; 15 _B and 15 _C are provided with indicator lights 17 _A1 , 17 _A2 , 17 _A3 . . . corresponding to the determined liquid on the display board 16 as shown in FIG.
17 This is a relay circuit that lights up _C3 . Note that since the liquids contained in each chamber A, B, and C are not specified, the relay circuits 15 _A , 15 _B , 15
_C has relays R _A1 , R _A2 , R _A 3 . . . R _C3 corresponding to the number of types of liquid that can be accommodated in each chamber, and normally open contacts r _A1 , r _A2 ,
r _A3 ... r _C3 are provided.

Since the present invention is configured as described above, for example, the pressure P _A1 = ρ _A H _A1 detected by one of the pair of pressure sensors 11 _A in the room _A , and the pressure detected by the other pressure sensor 11 _A2 . Pressure P _A2 = ρ _A H _A
2 is input to the differential pressure detection means _12A . Note that ρ _A is the density of the liquid stored in chamber A, H _A1 , H _A2
is the underwater position of both sensors 11 _A1 and 11 _A2 . For differential pressure detection means 12, △P _A = P _A2 - P _A1 = ρ _A
Based on the formula (H _A2 - H _A1 ), the differential pressure ΔP _A of the pressure sensor 11 _A in the chamber A is output. In addition,
In this case, the pressure difference ΔP _A is canceled out by the vapor pressure above the liquid 4 _A , so the magnitude of the pressure does not matter.

Next, when this differential pressure ΔP _A is input to the density conversion means 13 _A , each pressure sensor 11 _A , 11 _B , 11
Since the interval H in each chamber of _C is set to be the same in advance, from the above differential pressure △P _A , the formula ρ _A = △P _A /
ρ _A is calculated based on H. When this density ρ _A is input to the liquid determining means 14 _A , it is compared with the density of the liquid stored in advance (in this example, three densities of gasoline, kerosene, and diesel oil), and the above-mentioned density ρ _A is The density of the liquid is determined. When the liquid is determined, the relay circuit 15 _A
Relay R corresponding to the liquid in it, for example kerosene 4B
_A2 is activated, the normally open contact r _A2 is closed, and of the indicator lights in room A, only the indicator light 17 _A2 indicating kerosene lights up. Similarly for other rooms B and C, for example, 17 _B1 17 _C3
lights up.

Therefore, when an operator, for example, looks at the lit indicator light 17 of the indicator board 16 attached to the rear of the tank 1,
After confirming kerosene from _A2 , the operation handle _3A of the bottom valve _2A of chamber A can be operated. Further, a third party can check whether the handle _3A being operated by the worker is correct or not from the lit indicator light. In addition, if a desired liquid is stored in an empty chamber, the indicator light for the liquid in that chamber will automatically light up.
There is no need to predetermine the liquid stored in each chamber as in the past, and there is no need to change the description on the display board each time the liquid stored is changed.

Next, a device for preventing mix-up of discharged liquids according to an invention different from the above-described invention will be described.

Here, the same reference numerals are given to the parts that are not different from the above-described invention, and the description thereof will be omitted. As shown in FIG.
3. In addition to the liquid discrimination means 14, an indicator light 17 _A1 that displays the corresponding liquid based on the liquid discrimination signal;
17 _A2 ,...17 _C3 and the corresponding liquid match the liquid specified by the push switches PS _A1 , PS _A2 , PS _C3 , the bottom valve operation handles 3 _A , 3 _B , of the chamber containing the corresponding liquid are activated. _3C is provided with relay circuits _21A , _21B , and _21C for releasing the locking means _24A , _24B , and 24C _that lock the device.

The above relay circuit includes three sets of relay circuits 21 A, 21 _B , 21 for each liquid in each chamber A, _B , and C.
This is a circuit 21 in which _C is connected directly in parallel from one power source via an open/close type main switch MS. For example, the relay circuit 21 _A in room A includes a normally open contact (A contact) push switch PS _A and relays R _A1 , R _A2 , R _{A3 .}
Three circuits in which normally closed contacts and normally closed contacts operated by are connected in series are connected in parallel between the open/close type main switch MS and the solenoid SOL _A ,
In addition, a self-holding circuit _22A is connected to these. In addition, the push switch PS _A in these three circuits is set to PS A1, PS _A2 , PS _A2 , corresponding to each liquid.
PS _A3 , normally open contacts and normally open contacts are relays R _A1 , R _A
2 , r _A1 , r _A2 , r _A3 are displayed according to R _A3 . Relay circuits for each room 21 _A , 21 _B , 21 _C
The solenoids are labeled SOL _A , SOL _B , and SOL _C , and the self-holding circuits are labeled 22 _A , 22 _B , and 22 _C. In addition, FIG. 5 shows the relay circuits _21A , 21
_B , 21 Push switch PS _A1 , PS _A2 in _C ,
PS _A3 ...PS _C3 and indicator lights 17 _A1 , 17 _A2 , 17 _A3 ,...
17 _C3 is an example of the display board 20 arranged in one box for each liquid.

FIG. 6 shows the solenoids SOL _A , SOL _B ,
This is a conceptual plan view of a locking means 24 that moves forward and backward a locking pawl 23 that controls the rotation of the operating handle of the bottom valve of each chamber using SOL _C.
Disc 26 fixed to shaft 25A of _A Notch 27 of _A
A locking pawl 2 protruding from solenoid _{SOL A}
3 _A is engaged.

Since the present invention is constructed as described above, the relay circuit 21 operates as follows.

Now, the main switch MS of relay circuit 21 is ON.
Assume that kerosene is in room A and lamp 17 _A2 on display board 20 is lit. At this time, the normally closed contacts r _A1 and r _A3 remain closed because the relays R _A1 and R _A3 are not energized, and the normally open contact r _A2 is also closed because the relay R _A2 is energized. Therefore, when the normally open contact push switch PS _A2 is pressed, the solenoid SOL _A is energized, and the locking pawl _23A of the locking means _24A engages with the notch ₂ of the disc 26A.
7 Move back from _A and the lock will be released. At this time, the 22 _A relay R _A0 of the self-holding circuit is also energized, so its normally open contact r _A0 is closed, and even if the push switch PS _A2 is released, the solenoid SOL _A continues to be energized. Therefore, turn off the main switch MS.
The locking means _24A remains in the released state unless the locking means 24A is turned off.

Then, the operator can turn the operating handle _3A of the bottom valve _2A to discharge the kerosene in the chamber A from the tank. Note that even if the worker accidentally presses the push switch PS _A1 , regardless of whether indicator light 17 _A2 is lit, relay R _A1 is not energized, so contact r _A1
is not closed, solenoid SOL _A is never energized. Therefore, the locking pawl _23A will not retreat due to a wrong press. In addition, the operation handles 3B, 3 of the bottom valves _2B , _2C of chambers B and C
c will not be unlocked unless the push switches PS _B and PS _C are pressed, so even if the operator accidentally operates the operation handle 3B in chamber B, it will not rotate and a liquid other than the specified one will be discharged. Never.

In the above explanation, three types of liquids have been described, but the present invention can be applied to any tank that handles two or more types of liquids, and the same liquid may be placed in two or more chambers. Furthermore, although the lamp and push switch are arranged separately on the display board 20, it goes without saying that a push button and display lamp may also be used. In addition, when displaying the determined liquid, the display color is not limited to turning on the corresponding indicator light as described above, but may be other display means, such as a display color that changes depending on whether it is ON or OFF.

In addition to the operating handle of the bottom valve of the locking means of the present invention, the lids 6 _A , 6 _B , 6 _C of the liquid inlet of each chamber are provided.
may be provided. When liquid remains in each chamber and the same type of liquid is additionally stored, it is convenient because there is no possibility of inadvertently injecting into other chambers.

As described in detail above, the present invention automatically displays the liquid contained in the multi-chamber tank, and also controls the locking means of the operating handle using a relay circuit, thereby preventing operators from operating incorrectly due to misunderstandings or misunderstandings. It is possible to discharge the liquid contained in the tank without making a mistake.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional multi-chamber tank containing different liquids, Fig. 2 is a system diagram of a device for preventing mix-up of discharged liquids according to the present invention, Fig. 3 is an example of a display board, and Fig. 4
The figure is a system diagram of a device for preventing mix-up of discharged liquids according to a different invention, FIG. 5 is an example of its display board, and FIG. 6 is a conceptual diagram of a locking means. 1...tank, 2 _A , 2 _B , 2 _C ...bottom valve, 3 _A , 3
_B , 3 _C ...operation handle, 11 _A , 11 _B , 11 _C ...
Pressure sensor, 12 _A , 12 _B , 12 _C ... Differential pressure detection means, 13 _A , 13 _B , 13 _C ... Density conversion means, 1
4 _A , 14 _B , 14 _C ...liquid discrimination means, 15 _A , 15
_B , 15 _C , 21, 21 _A , 21 _B , 21 _C ...Relay circuit, 16, 20... Display board, 24, 24 _A , 24
_B , 24 _C ...locking means, A, B, C...chamber, PS _A1 ,
PS _A2 , PS _A3 …PS _C3 …Putsushiyuswitch.

Claims (1)

[Scope of Claims] 1. In a multi-chamber tank that individually accommodates liquids with different densities and has a liquid discharge bottom valve in each chamber, a pair of pressure sensors are provided at the bottom of each chamber with a vertical interval. , a means for detecting the pressure difference detected by this sensor, a density conversion means for calculating liquid density from this pressure difference, and a means for determining a liquid corresponding to this density and outputting a signal corresponding to the determined liquid. A device for preventing mix-up of discharged liquid from a multi-chamber tank, characterized by comprising a liquid discriminating means and a relay circuit for displaying the corresponding liquid based on the discriminating signal. 2. In a multi-chamber tank that individually stores liquids with different densities and has a bottom valve for liquid discharge in each chamber, a pair of pressure sensors are installed at the bottom of each chamber with a vertical interval, and a pressure sensor is detected by the sensor. a means for detecting a differential pressure between pressures; a density converting means for determining liquid density from this differential pressure; a liquid discriminating means for discriminating a liquid corresponding to this density and outputting a signal corresponding to the discriminated liquid; A relay circuit is provided that releases the locking means that locks the bottom valve operating handle of the chamber containing the liquid when the liquid in question based on the discrimination signal matches the liquid specified by the push switch. A device for preventing mix-up of discharged liquid from a multi-chamber tank. 3 In the relay circuit, a circuit for displaying the liquid contained in each chamber and a circuit for operating a locking means for a bottom valve operation handle of each chamber are connected in parallel from one end of the main switch, and a circuit for operating the locking means for the bottom valve operation handle of each chamber is connected in parallel from one end of the main switch. 3. A device for preventing mix-up of discharged liquids from a multi-chamber tank according to claim 2, characterized in that a circuit having a push switch for each liquid, a normally open contact, and a normally closed contact is connected in parallel to the circuit for causing the liquid to flow.