JPH0139957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a pump driven by a motor, a refueling nozzle provided on the discharge side of the pump, and a refueling nozzle that is turned on when the refueling nozzle is removed from a nozzle storage device to drive the motor. The present invention relates to a refueling device comprising a nozzle switch, which prevents the motor from starting when the refueling nozzle is removed from the nozzle storage device when power is restored after a power outage.

In general, conventional oil supply devices are configured such that a nozzle switch is turned on in conjunction with the operation of removing a fuel nozzle from a nozzle storage device, and the nozzle switch starts a motor.

For this reason, a temporary power outage may occur depending on the power situation, and the pump may also temporarily stop due to this power outage. However, with the conventional refueling system as described above, workers at the filling station may not notice this power outage, or may misjudge that the cause of the stoppage of refueling is due to a malfunction in the gasoline metering machine, causing the refueling nozzle to be removed from the vehicle. If you leave it in the fuel tank, the pump will automatically start again when the power is restored and electricity starts flowing, and gasoline will overflow from the fuel tank. Ta. Furthermore, even when a refueling station opens, the refueling nozzle may be removed from the nozzle storage device due to mischief or the like. In this case as well, if you turn on the main power supply for driving the pump to operate the gasoline metering machine at the beginning of the morning, there is a risk that the pump will start and depending on the condition of the fuel nozzle, gasoline may be discharged. Ta.

The present invention improves the shortcomings of the conventional oil supply device, and prevents the motor from restarting if the oil supply nozzle is removed from the nozzle storage device after the power is restored after a power outage, thereby improving safety. It is an object of the present invention to provide a refueling device that achieves the above objectives.

To achieve this objective, the present invention provides a pump driven by a motor, a flowmeter having a pulse generator disposed on the discharge side of the pump and emitting pulses proportional to the flow rate, and a flowmeter for the flowmeter. A refueling nozzle provided on the discharge side, a display unit that displays the amount of refueling in response to a pulse from the pulse transmitter, and a nozzle detection means that detects whether the refueling nozzle is stored or not stored in the nozzle storage device. The oil supply device is configured to supply drive power from a motor power supply to the motor to drive the motor based on a non-storage state detection signal output from the nozzle detection means, the motor being driven. voltage drop detection means for detecting a voltage drop in the power supply for the motor; the voltage drop detection means is connected to the nozzle detection means, and a voltage drop signal is input from the voltage drop detection means, and a voltage drop signal is input from the nozzle detection means; storage means for storing a voltage drop state when a storage detection signal is input, and erasing the stored content when a storage detection signal is input from the nozzle detection means after the motor power is restored; and the voltage drop detection. and motor control means that stops supplying driving power from the motor power supply to the motor until the memory contents of the storage means are erased when a voltage drop signal is input from the storage means. Features.

In the refueling device of the present invention, even if the nozzle switch is closed when the refueling nozzle is detached from the nozzle storage device and the motor that drives the pump is in a state where the power supply for the motor is cut off, the nozzle switch is subsequently closed. When the power supply for the motor is restored while the pump is closed, the motor is prevented from starting, thereby preventing the pump from being inadvertently driven and causing gasoline to overflow.

This will be explained above along with the embodiments shown in the drawings.

FIG. 1 shows a system diagram with the front panel removed when the gasoline metering device used in the present invention is a fixed gasoline metering device, in which 1 is the frame of the metering device, 2 is the pump, and 3 is the pump 2. Motor for driving, 4
is a flow meter provided on the discharge side of the pump 2; 5 is a fixed pipe; one end of the fixed pipe 5 is connected to an underground tank; the other end is connected to a hose 6 via the pump 2 and the flow meter 4; There is. 7 is a refueling nozzle provided at the tip of the hose 6.

Further, the flow meter 4 is provided with a pulse transmitter 8 that transmits pulses proportional to the flow rate, and the pulses from the pulse transmitter 8 are transmitted to a control circuit 9 provided in the frame 1 and detailed in FIG. is input. Reference numeral 10 denotes an electrical display that displays the amount of refueling based on a drive signal from the control circuit 9. As the display 10, an inverting display, a liquid crystal display, a plasma display, or the like is used. Note that the indicator 10 is not limited to an electrical indicator, and may be a mechanical indicator directly connected to the flowmeter 4 using an index wheel.

Reference numeral 11 indicates a nozzle hook as a nozzle storage device provided on the side wall of the frame 1, and the nozzle hook 11 is composed of a pedestal 11A and a nozzle tip storage opening 11B. A nozzle switch 12 is provided near the nozzle hook 11, and the nozzle switch 12 is connected to a switch section 12 connected to a motor power source to be described later.
A, and an operating piece 12B that is activated by the refueling nozzle 7 when the refueling nozzle 7 is properly placed on the nozzle hook 11. Here, in the nozzle switch 12, when the refueling nozzle 7 is placed on the nozzle hook 11, the actuating piece 12B is pushed against the spring and the switch portion 12A is opened.
When it is removed from the nozzle hook 11, the actuating piece 12B is returned by a spring and its switch portion 12A is closed.

Next, FIG. 2 shows a specific configuration of the control circuit 9 in FIG. 1. The same components as in FIG. Binary code 10 where pulses are input and counted
The decimal counting circuit 22 is a driving circuit that drives each digit of the display 10 by the counting signal from the counting circuit 21. The counting circuit 21, the driving circuit 22, and the display 10 constitute a display section. Here, counting circuit 2
1 is connected to a nozzle switch 12, and when the nozzle switch 12 is closed by removing the refueling nozzle 7 from the nozzle hook 11, the drive circuit 22 is configured to reset the previous display value. If each digit is a 7-segment character, for example, it is configured as a 4-bit 7-segment conversion drive circuit.

23 is a single-phase AC 100V power terminal;
3 is connected to a power supply circuit 24 that converts an AC voltage into a predetermined DC voltage, and the power supply circuit 24 is connected to a control circuit 9
It is used as a power supply for each circuit within the circuit. Reference numeral 25 indicates a voltage drop detection circuit that detects a voltage drop in the power supply circuit 24 due to a power outage, etc., and the voltage drop detection circuit 2
5 is a comparator 26, resistors R ₁ , R ₂ , R ₃ , R ₄ , and the resistors
Consists of a capacitor C connected in parallel with R ₄ ,
The output voltage of the power supply circuit 24 is controlled by resistors R ₁ , R ₂ , R ₃ , R ₄
The voltage is divided by , and input to input terminals 26A and 26B.
Here, if the input voltages of the input terminals 26A and 26B are V _A and V _B , respectively, the comparator 26 outputs an "H" level output signal when V _A < V _B , and outputs an "H" level output signal when V _A > V _B. The resistors R ₁ , R ₂ , R ₃ , and R ₄ are set so that V _A >V _B when the power supply circuit 24 is at a normal voltage. Therefore, when the voltage at the power supply terminal 23 decreases, the output of the power supply circuit 24 also decreases, but the voltage at the input terminal 26 decreases.
Since a capacitor C is provided at B, V _A < V _B during the discharge time, and the comparator 26 becomes "H".
level, which is transmitted as a voltage drop signal.

27 is a three-phase AC 200V power terminal;
7 is connected to a motor control circuit 28 which will be described later, and is also connected to another voltage drop detection circuit 29. The voltage drop detection circuit 29 has the same configuration as the voltage drop detection circuit 25 described above, and transmits a voltage drop signal when the voltage at the power supply terminal 27 drops due to a power outage or the like.

Next, the motor control circuit 28 is connected to an OR circuit 30.
It is connected to each of the voltage drop detection circuits 25 and 29 via the nozzle switch 12 and a memory circuit 31, which will be described later. Here, the motor control circuit 28 controls the motor 3 when the refueling nozzle 7 is removed from the nozzle hook 11 and the nozzle switch 12 is closed.
When the voltage drop signal is input from the OR circuit 30 while the nozzle switch 12 is turned on and the nozzle switch 12 remains closed, unless the memory contents of the memory circuit 31 are erased, even if the voltage at the power supply terminal 27 is restored. The motor 3 also has a built-in memory circuit so as to prevent the motor 3 from starting.

Further, 31 is a memory circuit constituted by, for example, a flip-flop element, etc., and the memory circuit 31 is connected to the OR circuit 30 and the nozzle switch 1.
A power supply 32 is provided which is connected to the power supply circuit 2 and which preserves the memory contents even when the power supply circuit 24 is out of power. The storage circuit 31 receives the voltage drop signal from either of the voltage drop detection circuits 25 and 29 via the OR circuit 30, and also receives the voltage drop signal from the nozzle switch 12.
Only when the voltage drop signal is closed, the fact that the voltage drop signal has been input is memorized and outputted to the motor control circuit 28 and an AND circuit to be described later. Furthermore, the memory circuit 31 is configured to erase the stored contents when the refueling nozzle 7 is returned to the nozzle hook 11 and the nozzle switch 12 is opened.

Furthermore, 33 is a clock oscillation circuit constituted by, for example, a clock oscillator, and the clock oscillation circuit 32 operates only when the nozzle switch 12 is closed and when normal voltage is supplied from the power supply circuit 24. oscillates the clock. The clock oscillation circuit 33 and the memory circuit 31 are connected to the input side of an AND circuit 34, and the output side of the AND circuit 34 is connected to the drive circuit 22.
That is, the AND circuit 34 outputs from the memory circuit 31 that there has been a voltage drop due to a power outage at either of the power supply terminals 23 or 27 with the nozzle switch 12 closed, and when the voltage of the power supply circuit 24 is recovered and the clock is When the clock is oscillated from the oscillation circuit 33, a blinking signal is transmitted. This flashing signal is then input to the drive circuit 22, and the display value of the amount of refueling up to the power outage displayed on the display 10 flashes. Therefore, in this embodiment, the clock oscillation circuit 33 and the AND circuit 34 constitute an alarm signal generation circuit that generates a blinking signal.

The first embodiment of the present invention is configured as described above, but when both the power supply terminals 23 and 27 are at normal voltage, the fuel supply nozzle 7 is connected to the nozzle hook 11 in order to supply gasoline to the fuel tank of the automobile. When the nozzle switch 12 is removed, the nozzle switch 12 is turned on, the motor 3 is started via the motor control circuit 28, the counting circuit 21 is reset, and the previous display value displayed on the display 10 is reset. At this time, the signal from the nozzle switch 12 is transmitted to the memory circuit 3.
1. Although the signal is input to the clock oscillation circuit 33, the AND circuit 34 does not generate a blinking signal.

Furthermore, if either of the power supply terminals 23, 27 is out of power while the refueling nozzle 7 is hung on the nozzle hook 11, the voltage drop detection circuits 25, 29 output a voltage drop signal, but the nozzle switch 12
is opened, the memory contents of the memory circuit 31 are erased,
The AND circuit 34 does not transmit a blinking signal.

Furthermore, if there is a power outage at either of the power supply terminals 23, 27 while the refueling nozzle 7 is removed from the nozzle hook 11, the voltage drop detection circuits 25, 29 will transmit voltage drop signals via the OR circuit 30. The signal is input to the motor control circuit 28 and the motor 3 is stopped.
At the same time, the memory circuit 31 stores that the voltage drop signal has been sent. First, there is a power outage at the power terminal 27, which is the power source for the motor, and then when the power outage ends and the power terminal 27 returns to normal voltage, the nozzle switch 12 has been turned on, so the nozzle switch 12 is connected to the motor control circuit 28. The signal is transmitted, but as described above, the motor control circuit 28 stores the state in which the voltage drop signal from the voltage drop detection circuit 29 is input, and the motor 3 cannot be restarted unless the nozzle switch 1 is opened. thwarted. on the other hand,
When the power supply terminal 23 experiences a power outage, and the power supply circuit 24 returns to normal voltage after the power outage ends, the clock from the clock oscillation circuit 33 and the memory contents from the memory circuit 31 are input to the AND circuit 34, and the AND circuit 34 sends a blinking signal to the drive circuit 22. Then, when the gas station worker sees the flashing display 10 and hangs the fuel nozzle 7 on the nozzle hook 11, the memory contents of the memory circuit 31 are erased, the flashing operation ends, and the motor control circuit 28 is also reset. Ru.

Next, FIG. 3 shows the voltage drop detection circuit 2 in FIG.
This embodiment shows another embodiment of No. 9, and the feature of this embodiment is that the voltage drop detection circuit connected to the power supply terminal 27 on the motor side is configured to include a delay circuit consisting of a timer and an AND circuit. In the event of a power outage within the specified time, a voltage drop signal is not sent and refueling operations can continue.

That is, in FIG. 3, the voltage drop detection circuit 29' includes a comparator 41, voltage dividing resistors _R1 ', _R2 ', _R3 ', _R4 ',
It consists of a capacitor C', a timer 42 connected to the comparator 41, and an AND circuit 43. here,
The input side of the AND circuit 43 is the comparator 41 and the timer 4.
2, and its output side is connected to the OR circuit 30.

In such a voltage drop detection circuit 29',
When a power outage at the power supply terminal 27 is detected, the comparator 41 outputs an "H" level voltage drop signal, which is input to the timer 42 and the AND circuit 43, as described in detail in FIG. However, since the timer 42 outputs the output to the AND circuit 43 after the set time has elapsed, the voltage drop signal will not be transmitted in response to a power outage within the set time.

Therefore, in the event of a power outage on the motor side within the time set in the timer 42, for example within several seconds, the motor 2 can be started at the same time as the voltage is restored.

In the embodiment of the present invention, a case has been described in which a nozzle hook 11 is attached to a fixed gasoline metering device and a nozzle switch 12 is provided on the nozzle hook 11. It can also be applied to a suspended type gasoline metering machine. That is, FIG. 4 shows another embodiment of the present invention, and parts having the same functions as those shown in FIG. 1 are given the same reference numerals. is provided with a nozzle lifting device 52 as a nozzle storage device, and the nozzle lifting device 5
2 is provided with a switch 53 that is turned on when the refueling nozzle 7 has descended to a predetermined height. Here, the nozzle lifting device 52 consists of a reel 52A and a motor 52B for driving the reel 52A, and the switch 53 detects the rotation of the reel 52A or the motor 52B and opens when the refueling nozzle 7 rises to a predetermined height. It also closes when the nozzle has descended to a predetermined height.
It has the same function as .

Therefore, the switch 53 of this embodiment may be connected to the circuit of FIG. 2 in place of the switch 12 of FIG. 1, and its operation is the same as that of the previous embodiment, so a description thereof will be omitted.

The oil supply device of the present invention has been described in detail above, and has the following effects.

If the refueling nozzle is disconnected from the nozzle hook or the refueling nozzle is inserted into the vehicle's fuel tank when the power is turned on again after a temporary power outage, the pump will be prevented from starting, preventing gasoline from flowing out of the fuel tank. Accidents such as overflow can be prevented.

By inserting a delay circuit into the voltage drop detection circuit of the motor power supply, in the event of a short power outage, refueling operations can be continued at the same time as the power outage is restored.

When the refueling nozzle is stored in the nozzle storage device, no power outage of the motor power supply is detected, so there is no inconvenience at all.

The control circuit of the present invention includes a fixed gasoline metering machine,
It can be easily applied to any type of suspended gasoline metering machine.

[Brief explanation of drawings]

Figure 1 is a system diagram with the front panel removed when the gasoline metering device used in the present invention is a fixed type gasoline metering device, and Figure 2 is a circuit diagram showing a first embodiment of the control circuit in Figure 1. , FIG. 3 is a circuit diagram showing another embodiment of the voltage drop detection circuit on the motor power supply side shown in FIG. 2, and FIG. It is a system diagram. 2...Pump, 3...Motor, 4...Flowmeter,
7... Refueling nozzle, 8... Pulse transmitter, 9...
Control circuit, 10... Display, 11... Nozzle hook, 12... Nozzle switch, 23, 27... Power terminal, 25, 29, 29'... Voltage drop detection circuit, 28... Motor control circuit.

Claims (1)

[Claims] 1. A pump driven by a motor, a flowmeter provided on the discharge side of the pump and having a pulse generator that emits a pulse proportional to the flow rate, and a display unit that receives a pulse from the pulse transmitter and displays the amount of refueling, and a nozzle detection means that detects whether the refueling nozzle is stored or not stored in the nozzle storage device; In the oil supply device configured to supply driving power from a motor power source to the motor to drive the motor based on a non-storage state detection signal output from the means, a motor power source for driving the motor A voltage drop detection means for detecting a voltage drop, which is connected to the voltage drop detection means and the nozzle detection means, respectively, and receives a voltage drop signal from the voltage drop detection means and receives a non-storage detection signal from the nozzle detection means. storage means that stores the voltage drop state when the motor power supply is restored, and erases the memory content when a storage detection signal is input from the nozzle detection means after the motor power is restored; and a motor control means that stops supplying driving power from the motor power supply to the motor until the memory contents of the storage means are erased when a signal is input. . 2. The voltage drop detection means is composed of a comparator that detects a voltage drop in the motor power supply, and a delay circuit provided on the output side of the comparator and having a timer and an AND circuit. Claim 1 characterized in that the voltage drop signal is not transmitted in response to a voltage drop within a certain period of time.
Lubricating device as described in section. 3. The nozzle detecting means is a nozzle switch provided on a nozzle hook, and the nozzle switch is a switch that is turned on when the refueling nozzle is removed from the nozzle hook and generates a non-storage detection signal. Refueling device. 4. The nozzle detection means is a switch that is provided in a nozzle lifting device installed at a high place at a gas station, and that is turned on when the fuel nozzle is lowered to a predetermined height to issue a non-storage detection signal. refueling device.