JPH0445073Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present application relates to an inventory control meter installed in a fuel storage facility where different types of fuel oil are stored, for example.

(b) Conventional technology At fuel oil storage facilities, level gauges, residual quantity gauges, etc. are used to manage the inventory of each type of oil, and when the inventory decreases, oil is brought in by tanker truck or other vehicle to replenish the oil. are doing. In this case, the amount of oil to be supplied and the type of oil vary depending on the storage tank, so great care is taken when replenishing the tank, but sometimes the tank is refilled incorrectly, and the amount of oil exceeds the space capacity of the tank. If you replenish it, the tank will overflow, which is dangerous, and if you replenish a large amount of a different type of oil, all the oil in the tank may become unusable. In order to prevent such mistakes, attempts have been made to check with a card reader or make judgments using a computer, but each method has advantages and disadvantages, and all of them require a huge investment in equipment.

(c) Purpose The purpose of this application is to solve such problems with low capital investment by using existing equipment.

(d) Configuration Therefore, in addition to existing equipment such as a liquid level gauge and a remaining amount gauge, this application includes multiple designation switches that designate a liquid storage tank, and a system that activates each sensor when one of these designation switches is operated. A memory for storing a detected value, a comparison means for comparing the detected value of the sensor and a value stored in the memory and outputting the difference as a comparison value signal, and determining whether or not this comparison value is within an allowable range. The apparatus is provided with a determination means, and is configured to issue an alarm when the comparison value deviates from an allowable range in a liquid storage tank other than the liquid storage tank corresponding to the operated designated switch.

(E) Examples T ₁ , T ₂ , T ₃ , and T ₄ are each a liquid storage tank (tank)
The first tank _T1 and the second tank _T2 contain regular gasoline, the third tank _T3 contains high-octane gasoline, and the fourth tank T3 contains regular gasoline.
Light oil is stored in each _T4 .

F ₁ , F ₂ , and F ₃ are respectively liquid supply ports, and liquid supply port F ₁ is connected to tank T ₁ and tank T ₂ by pipe P ₁ .
By switching the valves V ₁ and V ₂ in the middle, the tank T ₁
You can selectively replenish tank _T2 .

P ₂ and P ₃ are pipes connecting the liquid supply ports F ₂ and F ₃ to the tanks T ₃ and T ₄ , respectively.

S ₁ , S ₂ , S ₃ , and S ₄ are sensors that detect the liquid level height or residual liquid amount in the tanks T ₁ to _{T 4} (here, the latter will be explained for convenience), and each detected value are constantly outputted to the main body 1 of the management controller as signals _a1 to _a4 .

The main body 1 is equipped with a printer 2, a display 3, and a print start switch _K6 , which perform the tasks described below.

4 is an operation panel installed near the liquid supply ports F ₁ to F _3. On the operation surface, there are designated switches K ₁ , K ₂ , K ₃ , K ₄ for specifying the tank number, and when the liquid supply operation is completed. Lamps L ₁ , L ₂ , L ₃ , which display the oil type are provided corresponding to the completion switch K ₅ and switches K ₁ to K ₄ to be operated.
L ₄ , alarm lamp L ₅ and alarm buzzer B are installed.

Next, the configuration of the electric circuit will be explained, but since the circuits related to each sensor S ₁ to _{S 4} are independent and identical circuits, this part will only be explained as a representative of the system of sensor S ₁ . The system of is expressed by changing the suffix of the symbol.

M ₁ is the output signal g (one pulse) from the operation panel 4
C 1 is a memory that stores the value of signal A ₁ in response to the signal A 1, and C ₁ stores the stored value signal B ₁ output from memory M ₁ and the signal
_J1 is a _judgment circuit which outputs _{a judgment signal e1 when} the signal _d1 deviates from a predetermined value range.

A is an alarm drive circuit, which generates an alarm signal f when any of the judgment circuits J ₁ to _{J 4} outputs judgment signals e ₁ to e ₄ .
is output, causing lamp _L5 to blink and energizing buzzer B.

D is a display drive circuit that receives signals a ₁ to _{a 4} and displays information for each tank T ₁ to T ₄ as shown in Figure 2 on the display 3, and M is a sensor for each sensor when switch K ₆ is operated. This is a printer drive circuit that sends the detected values a ₁ to _{a 4} of S ₁ to _{S 4} to the printer 2 and prints them.

In the above configuration, the existing control system uses sensors.
S ₁ to _{S 4} , a display drive circuit D, a printer drive circuit M, a print start switch K ₆ , and a printer 2 display 3. In this case, in order to employ the present safety device, memories M ₁ to M are provided. ₄ , comparison circuit C ₁ ~
C ₄ , determination circuits J ₁ to _{J 4} , alarm drive circuit A, and operation panel 4 may be added.

Next, when the inventory amount for each tank is as shown on the display 3 in Figure 2 (the display 3 shows the tank number (tank
No.), the capacity of each tank, a picture that visually shows the tank and inventory amount, and the remaining amount (inventory amount) for each tank), the tank capacity is 10Kl and the inventory amount is 0.92Kl. A tank T ₁
The case of replenishing 9Kl of regular gasoline will be explained below. First, a hose of the lorry (not shown) is connected to the liquid supply port _F1 , and the valve _V1 is opened and the valve _V2 is closed. Then press switch K ₁ and start replenishing.

When the switch _K1 is pressed, the lamp _L1 lights up to notify that the switch _K1 has been operated, and a signal g (one pulse) is output from the operation panel 4 and is applied to each of the memories _M1 to _M4 . Each memory M ₁
~ _M4 , by inputting the signal g, the values of the signals _a1 to _a4 at the time of input are stored in place of the previously stored values, and these newly stored values are used as the stored value signal _b1. are applied to comparison circuits C ₁ to C ₄ respectively. Furthermore, at this time, tank T ₁ corresponding to switch K ₁
The signal h ₁ is input only to the judgment circuit J ₁ for use.

The determination circuits J ₁ to J ₄ do not output the signals e _{1 to e 4 when the signals h 1 to h 4} are input, respectively. In other words, when the tank T ₁ is refilled, the value of the signal a ₁ increases, a difference with the signal b ₁ occurs, and the value of the signal d ₁ increases, reaching the tolerance range (liquid level) predetermined in the judgment circuit J _1. Since the determination circuit J 1 attempts to output the signal e 1, the determination circuit J ₁ attempts to output the signal e ₁ , but since the signal h ₁ is input, it outputs the signal e ₁ . is blocked, the alarm drive circuit A does not output the signal f, and no alarm is issued.

However, if you make a mistake in switching the valves and close valve V ₁ and open valve V ₂ , the tank T ₁ will be refilled instead of tank T ₂ , and if you leave it as it is, the space volume will be (10 3.81=) 6.19Kl tank T ₂ to 9
Kl will be replenished so it will overflow. However, as the value of signal a ₂ increases, the difference between signal b ₂ and signal a ₂ increases, that is, signal d ₂ deviates from the tolerance range determined by judgment circuit J ₂ .
J ₂ outputs the signal e ₂ (at this time, the judgment circuit J ₂ receives the signal
h ₂ is not input, the output of signal e ₂ is not prevented), alarm drive circuit A outputs signal f, causing lamp L ₅ to flash, buzzer B to be activated, and an alarm to be issued. Report the mistake as soon as possible.

This alarm is issued in the same way when tank T ₃ or tank T ₄ is refilled by mistake, so a large amount of different oils will not be mixed in. In addition, when replenishing tank T ₂ after replenishing tank T ₁ , press switch K ₂ after switching valves V ₁ and V ₂ , lamp L ₂ will be lit instead of lamp L ₁ , and signal g will be turned on again. is output, and furthermore, the signal h ₁ disappears and the signal h ₂ is output in its place. To replenish tank T ₃ , simply operate switch K ₃ , and to replenish tank T ₄ , operate switch K ₄ , and the amount of stock in tanks other than the tank corresponding to the operated switch will be Similarly, an alarm is issued when there is a change.

When all the replenishment work is completed and the switch _K5 is pressed, the signals _h1 to _h4 that are being output disappear and all the lamps _L1 to _L4 are also turned off.

Although configured as detailed above, the present safety device can not only be used in addition to an existing control device, but also can be supplied as an integrated unit in combination with known sensors and related mechanisms if there is no existing control device. On the other hand, the operation panel can also be integrated with the main body.

In addition, in this embodiment, a comparison circuit and a judgment circuit are provided corresponding to each sensor, but one comparison circuit and one judgment circuit are provided, and the output signals from each memory and each sensor are time-divided. It is also possible to make it work in the same way as import.

(F) Effect As is clear from the above description, by adopting this safety device, it is possible to detect at an early stage when a liquid storage tank other than the intended one has been refilled, thereby preventing the risk of overflow or abnormality. Accidents caused by mixing of large amounts of dripping liquid types can be effectively prevented with a low investment.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a reservoir including a liquid storage tank and a control meter, and FIG. 2 is a block diagram showing an electric circuit constituting the present invention. 1... main unit, 2... printer, 3... display, 4... operation panel.

Claims (1)

[Scope of utility model registration request] A plurality of sensors are installed in the liquid storage tank and are connected to each other to detect the liquid level or inventory level and output a detection signal corresponding to the detected value.This detection signal is processed and sent to each liquid storage tank. An inventory control meter with a function of displaying the amount of inventory in a tank includes a plurality of designation switches for designating a liquid storage tank, and a memory that stores the detection value of each sensor when one of the designation switches is operated. , a comparison means for comparing the detected value of the sensor and a value stored in the memory and outputting the difference as a comparison value signal, and a determination means for determining whether or not this comparison value is within an allowable range are provided, and the operation is performed. A safety device in an inventory control meter configured to issue an alarm when the comparison value deviates from an allowable range in a liquid storage tank other than the liquid storage tank corresponding to the designated switch.