JPS6154677B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid supply device, such as a fuel supply device used at a gas station.

In recent years, oil supply devices equipped with a preset device have become popular. As is well known, a preset oil supply system automatically stops oil supply when a preset amount or amount of oil has been filled.
In this case, the oil supply is usually stopped by closing a solenoid valve provided in the oil feed path or by deenergizing the oil feed pump.

By the way, many refueling nozzles are designed to refuel by opening a built-in valve by operating a lever, but when refueling is performed with the lever locked in the valve open position and the preset amount of refueling is completed, refueling stops. At this time, it is necessary to release the lock of the lever and return the built-in valve to the closed state. If you forget to close the refueling nozzle valve and put the nozzle in the nozzle case, and then take it out of the case for the next refueling, the pump will be driven, the solenoid valve in the flow path will open, and oil will spray out from the nozzle tip. It is dangerous.

The present invention was proposed in order to prevent such a risk, and includes a liquid supply nozzle, a liquid supply channel that sends liquid to the liquid supply nozzle, and a pump inserted in this liquid supply channel. , a drive motor for this pump, a flow meter inserted in the liquid sending channel, a flow pulse transmitter that emits a number of flow pulses according to the amount of liquid measured by this flow meter, a display, and a supply. In a liquid supply device equipped with a nozzle switch that generates and extinguishes a nozzle signal in accordance with the start and end of a liquid supply operation by a liquid nozzle, a timing operation is performed in response to an operation signal input from the nozzle switch, and a predetermined short period of time is elapsed. a timer circuit that generates a timing signal; a motor phase control circuit that drives the motor while limiting its rotational torque in response to input of the nozzle signal;
a motor rotation angle detection sensor that detects the rotation angle of the motor; and a determination circuit that outputs a determination signal when the motor rotation angle detection sensor detects a predetermined rotation angle of the motor while a timing signal is being output. It is characterized in that it is configured to stop liquid supply from the nozzle based on this determination signal.

The illustrated embodiment will be described below.

In FIG. 1, 1 is a housing of a ground-mounted oil supply system, and 2 is an oil feed pump, which is driven by a motor 3 and pumps up oil from an underground oil storage tank (not shown) through a pumping pipe 4 and an oil feed path 5. send to 6 is a flow meter installed in the oil feed path 5, which measures the amount of oil fed;
Its output is input to the oscillator 7. 8 is a refueling hose, and 9 is a refueling nozzle attached to the tip of the refueling hose 8.

V1 is a large flow solenoid valve installed in the oil feed path 5;
Reference numeral 2 designates a small flow rate solenoid valve interposed in the bypass passage 5' spanning V1.

Reference numeral 10 denotes a control section, an example of which has a circuit configuration as shown in FIG. 2, and performs the operations described below.
11 is a display device.

Reference numeral 12 represents a preset keyboard, and 13 represents a nozzle case provided in the refueling device housing 1, in which the refueling nozzle 9 is housed. When the refueling nozzle 9 is removed, the nozzle switch 14 is operated, and an operation signal (nozzle signal) is generated. It is input to the control unit 10.

Reference numeral 30 connects a power supply branch box 32 disposed in an office 31 of a gas station to a control unit 10 in the housing 1 through a power supply line, and supplies power to the control unit 10 .

33 is an optical fiber that connects a terminal (POS) 34 located in the office 31 and the control unit 10, and converts the signal from the control unit 10 to an electrical/optical conversion circuit 35.
(FIG. 2) to the terminal 34.

Note that the power supply wire 30 and the optical fiber 33 are all inserted through a protection pipe 36 and placed between the housing 1 and the office 31 via underground.

When optical fibers are used in this way, multiple pieces of information can be transmitted using a single fiber, and because they are thin, they do not take up much space, and even if they are inserted into the pipe 36 together with the power supply wires, noise from the power supply wires is eliminated. There is no need to worry about it being picked up, and it also has the advantage of being less susceptible to lightning.

37 is an optical sensor connected to the display drive circuit 20 of the control section 10. The display 11 uses a self-luminous type that uses plasma, LED, electrical resistance wire, etc., and it shines brightly to overcome external light during the day, but it is too bright and difficult to see at night. The light sensor 37 detects the level of external light and adjusts the level of light emitted by the display. This not only saves energy but also extends the life of the display.

The configuration of the control unit 10 is shown in FIG. 2, and the desired amount of oil (for example, 20 liters)
When the signal A is set in advance (preset), the preset circuit 12' outputs the corresponding signal A.

The signal A from the preset circuit 12' is given to the subtraction counter SC1 and the arithmetic circuit 21, and the arithmetic circuit 21 inputs the signal A (preset value) to the setting circuit 22.
Subtract the value set by subtracting the specified value from the counter.
Give to SC2.

When the nozzle 9 is removed from the nozzle case 13, the nozzle switch 14 generates a signal B, which is transmitted to the motor phase control circuit 15 and the timer circuit 16.
given to. Upon input of the signal B, the timer circuit 16 starts timing operation, and continuously outputs the timing signal C for a predetermined relatively short period of time (for example, 1 second).
Output.

Signal B is also used as a reset signal for the addition counter.
It is applied to AC and subtraction counters SC1 and SC2 to reset these counters to zero and to take in the signal A and the output from the arithmetic circuit 21, respectively. Signal B is further applied to large flow valve drive circuit 24 and small flow valve drive circuit 23 to open large flow valve V1 and small flow valve V2.

Timing signal C is given to motor phase control circuit 15 and determination circuit 17 as an activation signal.

The motor phase control circuit 15 is operated by the AND input of the signals B and C and starts supplying power to the motor 3, but during the input period of the signal C, the waveform of the input current to the motor 3 is changed to a perfect sine wave. Instead, a part of the waveform is reduced, for example, the waveform is made by cutting off the half wave from the rising edge to the peak, so that sufficient rotational torque is not applied to the motor 3.

Therefore, if the built-in valve of the nozzle is closed when the motor 3 is started, the pump 2 cannot be rotated against the pressure on the secondary side of the pump 2 after the hose swells a little due to its elasticity. , motor 3 will not rotate any further. Although the pump 2 has a built-in relief valve, this valve cannot be pushed open because the rotational torque of the motor is insufficient.

However, when the built-in valve of the nozzle 9 is open, the pressure on the secondary side of the pump 2 does not increase and the motor 3 rotates, but it is sufficient to overcome the flow path resistance and allow the motor to rotate normally. Oil will not be spouted from the nozzle tip because a certain torque is not applied.

The rotation angle of the motor 3 is detected by a sensor 18,
The detection signal F is given to the determination circuit 17. The determination circuit 17 determines whether the built-in valve of the nozzle is open or there is a leak in the pipe when the rotation angle of the motor exceeds a certain value during the input period (for example, 1 second) of the signal C from the timer 16. A signal (valve closing signal) E is generated to close the large flow valve V1 and the small flow valve V2 via the large flow valve drive circuit 24 and the small flow valve drive circuit 23.

The setting of the predetermined time in the timer 16 is based on the following circumstances. That is, the motor continues to rotate when refueling is performed, but if the built-in valve of the refueling nozzle 9 is closed, the motor should not rotate. However, in reality, the oil supply hose 8 is expanded (inflated) and a small amount of oil moves toward the oil supply nozzle 9, so the motor 3 rotates by this amount of flow even if the built-in valve of the nozzle is closed. Therefore, the valve of the refueling nozzle 9 is in the open state only when the angle motor rotates by an amount equal to or greater than the flow rate that pushes and spreads the refueling hose 8 while the signal C is output from the timer 16, or the valve of the refueling nozzle 9 is in the open state, or It determines that there is a leak and closes valves V1 and V2. Specifically, how many times does the motor need to rotate before the built-in valve of the refueling nozzle opens?
Alternatively, whether or not it is determined that there is a leak in the refueling hose is determined by considering the type of pump in addition to the above-mentioned bulge in the hose. Further, the setting time of the timer is set to be shorter (usually about 1 second) than the time normally required from when the nozzle is taken out from the nozzle case until it is inserted into the refueling port.

When the valves V1 and V2 are closed, the built-in valve of the nozzle 9 is closed, the nozzle is returned to the case, and the nozzle is taken out again to perform a refueling operation. If there is a leak in the flow path, etc., take necessary repair measures.

The nozzle 9 is taken out from the nozzle case 13, and if the rotation of the motor by the predetermined angle or more is not detected while the signal C from the timer 16 remains, the signal E will not be output, so refuel by operating the nozzle lever. be able to. In this case, signal C
(1 second in the above example), motor 3
rotates with low torque, but when this signal C disappears (after 1 second), it returns to normal torque rotation.

As refueling progresses, the signal D (flow rate pulse) from the transmitter 7 is counted by the addition counter AC, and this counted value is displayed on the display 11 via the display drive circuit 20.

As mentioned above, the signal A corresponding to the preset oil supply amount (for example, 20 liters) from the preset circuit 12' is stored in the subtraction counter SC1 and is also applied to the arithmetic circuit 21.

The small flow rate refueling amount setting circuit 22 sets the last predetermined amount (for example, the last 0.2 liters) of the preset refueling amount (20 liters) to be refueled at a small flow rate, and sends this set value to the calculation circuit 21. give. The arithmetic circuit 21 supplies the difference between the values of both inputs (20 liters - 0.2 liters = 19.8 liters) to the subtraction counter SC2 and stores it there.

Flow rate pulse D is subtraction counter SC1 and SC2
and subtracted from their respective stored values (SC1 is 20 liters, SC2 is 19.8 liters).
When 19.8 liters of oil is refilled and the subtraction value in counter SC2 becomes O, this counter generates a signal (large flow valve closing signal) G, and this signal G is given to the large flow valve drive circuit 24 to close the large flow valve V1. is closed to perform lubrication at a small flow rate.

When 0.2 liters of oil has been refilled with a small flow rate, a total of 20 liters of oil has been refilled, and the subtraction counter SC1 has a subtracted value of O, so it outputs a signal (motor stop signal) H, and the small flow valve drive circuit The small flow valve V2 is also closed via 23.

In the embodiments described above, the rotational torque of the motor is controlled by changing the current waveform, but a voltage drop method may also be used.

Further, the refueling nozzle may have no built-in valve and may be configured to control a valve or a motor within the refueling machine housing by operating a lever on the nozzle. Switching between the small flow rate and the large flow rate may be performed by opening and closing a valve (which may also be used as a relief valve) inserted into a bypass path that communicates the primary side and secondary side of the pump 2.
Furthermore, the rotation speed of the motor 3 may be controlled without using a valve, and the motor is not limited to an electric motor, and may be driven by fluid pressure. In this case, the torque adjustment can be effected by adjusting the fluid pressure.

In addition, in a lubrication system that does not include a preset device, for example, in order to accurately stop lubrication at a desired lubrication amount, the nozzle valve is throttled a little before the desired lubrication amount is reached, and lubrication is performed at a small flow rate. The present invention can also be applied to a refueling device configured to stop refueling when the refueling amount reaches a predetermined amount after the change to . Furthermore, the present invention can be implemented not only in oil supply devices but also in a wide range of liquid supply devices.

As described above, according to the present invention, even if there is a mistake in operating the liquid supply device, such as forgetting to close the built-in valve of the liquid supply nozzle, it is possible to prevent the risk of a large amount of liquid spewing out from the nozzle at the start of liquid supply. can.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing the configuration of an embodiment of the present invention, and FIG. 2 is a block diagram of the control section of the apparatus. DESCRIPTION OF SYMBOLS 1... Housing, 2... Pump, 3... Pump motor, 4... Sumpling pipe, 5... Oil supply path, 6...
Flow meter, 7...Flow rate pulse transmitter, 10...Control unit, 11...Display device, 12...Keyboard, 1
2'... Preset circuit, 13... Nozzle case, 14... Nozzle switch, 15... Motor phase control circuit, 16... Timer circuit, 17... Judgment circuit, 18... Motor rotation angle detection sensor, 2
0... Display drive circuit, 21... Arithmetic circuit, 22
... Setting circuit, 23 ... Small flow valve drive circuit, 24
...Large flow valve drive circuit, 33...Optical fiber, 37...Light detection sensor, V1...Large flow valve, V2...Small flow valve, AC...Addition counter,
SC1, SC2...Subtraction counter.

Claims (1)

[Scope of Claims] 1. A liquid supply nozzle, a liquid supply channel for sending liquid to the liquid supply nozzle, and a pump inserted in the liquid supply channel,
A driving motor for the pump, a flow meter inserted in the liquid sending channel, a flow pulse transmitter that transmits a number of flow pulses corresponding to the amount of liquid measured by the flow meter, an indicator, and the flow meter. In a liquid supply device equipped with a nozzle switch that generates and extinguishes a nozzle signal in accordance with the start and end of a liquid supply operation by a liquid supply nozzle, a timer operation is performed in response to an input of an operation signal from the nozzle switch to generate a predetermined amount of water. a timer circuit that generates a timing signal for a period of time; a motor phase control circuit that drives the motor while limiting its rotational torque in response to the input of the nozzle signal; and a motor rotation that detects the rotation angle of the motor. It consists of an angle detection sensor and a determination circuit that outputs a determination signal when the motor rotation angle detection sensor detects a predetermined rotation angle of the motor while the timing signal is being output, A liquid supply device characterized in that the liquid supply device is configured to stop liquid supply from the nozzle based on the timing.