JPH0226877Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present application relates to a control meter that is used particularly at a gas station to control the amount of oil in an oil storage tank.

(b) Conventional technology At business establishments that store oil, such as gas stations, the amount of oil in each tank is always managed using a control meter, and when the remaining amount decreases, oil is brought in by tank truck or other vehicle to replenish the oil. are doing. In this case, since the amount of oil to be replenished varies depending on the tank, great care is taken when filling the oil, but sometimes people mistakenly fill the tank with oil and fill it with more oil than the space capacity of the tank, causing it to overflow. I had an accident where I was injured. Additionally, the type of oil to be supplied differs depending on the tank, and a mistake in filling the tank could result in the oil becoming unusable.

Therefore, we decided to operate the ticket ticket (Japanese Unexamined Patent Publication No. 57-188699) and the various recognition switches installed in various places (Unexamined Japanese Patent Publication No. 59-1886).
15092), and changes in sensor output (Unexamined Japanese Patent Publication No. 1509-1509-
102,629), etc., to eliminate ``transfer errors'' are being considered by various companies, and some have already been implemented.

(c) Problems that the invention aims to solve However, in some gas stations, multiple tanks are connected by siphon pipes, and in such cases, the fuel tank is connected together with the siphon pipe. As the amount of oil in each tank increases, the previously proposed or implemented control system has the inconvenience of issuing an alarm for the wrong tank. Install a memory circuit to remember whether it is connected or not, so that even if the amount of a tank other than the specified tank increases, it will not issue an alarm if it corresponds to a previously stored tank. However, it would be undesirable in terms of cost to install this circuit in all control meters in advance, and it would be undesirable in terms of production management to make some models with the circuit installed and others without it. Another method is to modify the wiring so that when the switch corresponding to the tank you are trying to lubricate is operated, the switches corresponding to other tanks connected to that tank via siphon pipes will be in the same state as being operated at the same time. However, in this case, the situation is the same as if multiple switches were operated at the same time, and the check mechanism that is implemented to prevent erroneous operation of the switches is also involved, and the modification work itself to add wiring must be done at the installation site. The problem arises that specialized engineers have to go to the site.

(d) Configuration and operation to solve the problem The present application is a management system that does not require the installation of the memory circuit or the on-site work of a specialist engineer, and can be handled with one type of model regardless of whether or not there is a siphon tube. The proposed system includes a liquid level sensor and a switch for specifying the tank provided for each tank, a notification means, and a control means for selectively operating the notification means based on output signals from the liquid level sensor and the switch. It consists of
During refueling, when the output signal of the sensor of a tank other than the specified tank changes, this will be notified, but first the output signal of the sensor of the specified tank changes, and then the output signal of the sensor of other tanks changes. The above notification will not be made.

(e) Embodiment T ₁ , T ₂ , and T ₃ are tanks, respectively, and sensors S ₁ , S 2 , and S ₃ detect the amount of oil stored and output sensor signals a ₁ , a ₂ , and a ₃ corresponding to the _amount of oil stored. and oil filler ports I ₁ , I ₂ , I ₃
is installed.

D ₁ and D ₂ are oil supply machines, each of which has a built-in pump and flow meter (both not shown).

P ₁ is a suction pipe connecting tank T ₁ and refueling machine D ₁ , P ₂
It is also a suction pipe, one end of which is connected to _the siphon pipe _P3 that connects tanks _T2 and _T3 , and the other end is connected to the refueling machine _D2 , which is used to refuel. In this case, oil from both tanks T ₂ and T ₃ will be sucked. At this time, even if more oil in one tank is suctioned than the other tank, as time passes, the oil in the tank with a higher oil level will pass through the siphon pipe P ₃ to the tank with a lower oil level. Flow The oil levels in both tanks are the same.

B is a control unit installed in an out-of-the-way place such as an office, and the panel surface 2 has a display 4,
6, 8, an alarm 10 serving as a notification means, a printer 12, and a print start switch 14, which will be described later, are provided.

C is _an operation unit installed at the site, such _as near _the oil filler port.
6, 18, and 20 are provided, and when these switches are operated, one of tank designation signals t ₁ , t ₂ , and t ₃ corresponding to the designated tank is output.

22, 24, and 26 are signal conversion circuits, respectively;
Receive sensor signals a ₁ , a ₂ , a ₃ from each sensor and convert them into numerical signals e ₁ , e ₂ , e ₃ on display units 4, 6,
8 to display the numerical value as the amount of oil stored.

Reference numeral 28 denotes a monitoring circuit control means, which performs the following functions.

Any of the tank designation signals t ₁ , t ₂ , t ₃ output from the operation unit corresponding to the specified tank and the numerical signals e ₁ , e ₂ , e ₃ representing the oil storage amount are input, and the tank other than the specified tank is input. When the numerical signal changes, a notification signal f is output to activate the alarm 10 to notify of a mistake in lubrication.

Even if the numerical signal of a tank other than the designated tank changes, the notification signal f is not output if the numerical signal of the designated tank has changed before that.

However, the time difference between when the numerical signal of the designated tank starts changing and when the numerical signals of other tanks start changing must be within a predetermined time (for example, within 3 minutes).

Reference numeral 30 is a printer drive circuit which takes in numerical signals e ₁ , e ₂ , e ₃ at the time when the switch 14 is operated, causes the printer 12 to print them, and outputs the oil storage amount as a hard copy.

In the above configuration, when unloading oil from a tank truck (not shown) to a tank, first the switch on the operating section C is operated to specify the tank to be filled with oil. For example, when filling the tank T ₁ with oil, the switch 16 is pressed to output the tank designation signal t ₁ and the oil is filled from the oil filling port I ₁ . As lubrication progresses sensor signal a ₁ of sensor S ₁ is detected in tank T ₁
The amount of oil changes depending on the amount of oil in the tank, and the amount of oil is displayed numerically on the display 4.

At this time, the numerical signal e ₁ is input to the monitoring circuit 28, but the tank designation signal t ₁ has been input first, and the signal
Since e ₁ is from tank T ₁ , the notification signal f
is not output. However, when the tank _T2 is filled with oil by mistake and the numerical signal _e2 changes, the notification signal f is immediately output and an alarm is issued. Next, let us describe the case where the switch 18 is operated to output the tank designation signal _t2 and oil is supplied to the tank _{T2 .}
The amount of oil in tank T 3 increases rapidly, but because the oil in tank T ₂ is supplied to tank T ₃ through a thin siphon pipe, the amount of oil in tank T ₃ increases slowly.
That is, the numerical signal e ₂ changes at the same time as the oil is filled, but the numerical signal e ₃ does not change until some time later. Therefore, as mentioned above, even if the numerical signal _e3 changes in this case, the alarm 10 will not be activated. This also applies when the switch 20 is operated to output the tank designation signal _t3 and the tank _T3 is filled with oil.

), the reason for setting a range for the time difference between the start of change of each numerical signal is, for example, after operating the switch 18 to specify tank T ₂ , generating signal t ₂ , and filling tank T ₂ with oil (one time). Normally 7~ for lubrication
(It takes 10 minutes) If you lubricate tank T ₁ without operating switch 16 and generating tank designation signal t ₁ instead of tank designation signal t ₂ (while signal t ₂ continues to be output), This is because if a range of time differences is not provided, the alarm will not be output.

In this embodiment, numerical signals e ₁ , e ₂ , e ₃ are input to the monitoring circuit 28, but sensor signals a ₁ , a ₂ , a ₃ are input instead. It is also possible to install an alarm on the operation unit.

Furthermore, in addition to outputting an alarm when lubrication is incorrect, it is also possible to forcibly stop lubrication by installing a solenoid valve or the like in the lubrication port and closing this valve.

(F) Effect As detailed above, even if the liquid level in a tank other than the designated tank fluctuates, if the fluctuation in the designated tank occurs first, the alarm will not be issued. Even if it is installed, there is no need to install a new memory circuit in the control meter or modify the circuit on site by a specialized engineer, so it is inexpensive and easy to install, and prevents mistakes in lubrication to the tank. This provides a control system that can prevent false alarms without impairing functionality.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the entire system, and FIG. 2 is a block diagram showing the electric circuit within the control section. T ₁ , T ₂ , T ₃ ... Tank, D ₁ , D ₂ ... Refueling machine,
B...Control unit, C...Operation unit.

Claims (1)

[Scope of utility model registration request] It is equipped with a sensor that detects the oil level height or oil amount in each tank and generates a corresponding output signal, and a switch and notification means that are installed corresponding to each tank and generates a tank designation signal. When the switch corresponding to the tank to be lubricated is operated in advance prior to the start of lubricating, when the output signal of a sensor other than the specified tank changes during lubricating, an alarm signal is generated and sent to the alarm means,
On the other hand, an oil amount management meter for an oil storage tank comprising a control means that does not generate the notification signal when the output signal of a sensor of a designated tank changes first and then the output signal of a sensor of another tank changes.