JPH0134879B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refueling device for use in gasoline refueling stations for automobiles and the like.

In such a refueling system, a refueling pump is provided in the middle of a refueling pipe connecting an underground tank and a refueling nozzle valve, and this refueling pump is rotated by a drive motor to send oil to the nozzle valve.

In conventional refueling systems, the drive motor and refueling pump rotate at full power until refueling is started by removing the nozzle valve from the nozzle hook installed on the refueling machine, and the nozzle valve is hooked onto the nozzle hook after refueling. Ta.

At this time, depending on the degree of opening and closing of the nozzle valve, excess oil is returned through a return path that connects the front and back of the oil supply pump and has a relief valve in the middle.

In the past, the motor and pump were always driven at full power, which resulted in a lot of wasted power consumption, and caused significant wear on the pump and motor.Furthermore, high pressure was constantly applied inside the oil supply pipe, so the oil supply connected to the oil supply pipe This accelerates the deterioration of the hose, the valve opening lever of the nozzle valve becomes heavy and difficult to operate, and in addition, when the valve is closed, an impact commonly referred to as water hammer is more likely to occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide an oil supply device that eliminates the above-mentioned disadvantages, eliminates unnecessary movement of the pump motor, and, as a result, saves energy and increases the durability of equipment.

However, according to the present invention, the purpose of the lever is to sequentially connect a pump and a flow meter in the middle of a fuel supply pipe whose one end is connected to a nozzle valve via a fuel supply hose and the other end is connected to an underground tank. Relief amount detection that detects the amount of relief in the return path in a refueling system that connects the and outflow side with a return path with a relief valve, connects a motor to the pump, and has a display meter that displays the amount measured with a flowmeter. This is achieved by providing a motor rotation control means which speeds up the rotation of the motor when the relief amount detected by the relief amount detection means is below a certain value, and slows down the rotation of the motor when it exceeds a certain value.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. In the figure, 1 indicates a refueling machine. A nozzle hook 2 is provided on the side of the refueling machine 1, and a nozzle valve 3 is hung thereon.

The nozzle hook 2 is provided with a nozzle switch 4 which is opened and closed by hooking and unhooking the nozzle valve 3.

The nozzle valve 3 is connected to a refueling pipe 6 communicating with an underground tank via a refueling hose 5, a refueling pump 7 and a flow meter 8 are installed in the middle of the refueling pipe 6, a drive motor 9 is connected to the pump 7, and The flow meter 8 is provided with a flow pulse transmitter 10.

Furthermore, the ends of the return path 11 were connected before and after the oil supply pump 7 of the oil supply pipe 6, and a relief valve 12 was provided in the middle of the return path 11, and a relief amount detector 18 was provided on the relief valve 12. This relief amount detector 1
8 detects the position of the relief valve 12 based on changes in the light blocking position and magnetism using conventionally known means such as optical sensors and magnetic sensors, calculates the opening degree of the relief valve 12 based on this, and calculates this opening. It is provided with a calculation means for further detecting the amount of relief from the degree of relief. 13 in the figure is a refueling amount indicator.

The output signal A'' from the nozzle switch 4 is introduced into the display meter 13 and the motor control circuit 14, and the flow rate output signal B'' from the flow rate pulse transmitter 10 is input to the display meter 13.
to be introduced.

The output signal H of the relief amount detector 18 is introduced into the motor control circuit 14, and the output signal F'' from the motor control circuit 14 is introduced into the motor 9.

The motor control circuit 14 sends a signal that slows down the rotation when the signal from the relief amount detector 18 is above a certain value (for example, 2/min), and speeds up the rotation when it is below a certain value (for example, 1/min). It functions to transmit signals to motor 9.

To explain how to use it, when the nozzle valve 3 is removed from the nozzle hook 2, the nozzle switch 4 is closed and the output signal A'' from the nozzle switch 4 is introduced into the display meter 13 and the motor control circuit 14.

In response to this output signal A'', the display meter 13 returns the previous display to zero.

Similarly, in response to the output signal A'', the motor control circuit 14 transmits to the motor 9 an output signal F'' that instructs the pump 7 to rotate at the lowest speed.
starts rotating at the lowest speed according to this command.

Note that all oil circulates through the relief valve 12 until the nozzle valve 3 is opened.

When the nozzle valve 3 is opened to supply oil, the amount of liquid passing through the relief valve 12 decreases, and the relief valve 12 is closed.

The relief amount detector 18 detects the displacement of the valve 12,
It is detected by the light shielding position and magnetic change, and the arithmetic means calculates the opening degree of the relief valve 12 based on this displacement amount, and further detects the relief amount based on this opening degree and outputs H. Motor control circuit 14
tell to. When the value becomes 1/min or less, the motor control circuit 14 sends an output signal F'' that instructs the motor 9 to increase its rotational speed, and as the signals H and F'' are repeatedly transmitted in sequence, the motor 9 The speed increases until it reaches full speed rotation.

On the other hand, when the nozzle valve 3 is throttled, the relief valve 1
The flow rate through 2 increases, and the signal from the detector 18 causes the motor control circuit to reduce the rotational speed of the motor 9 so that the relief amount is less than 2/min.

In this way, the rotation speed of the motor 9 is controlled by the output signal from the detector 18 so that the flow rate of the relief valve 12 is always kept constant.

Output signal from pulse transmitter 10 during refueling
In response to B'', the display meter 13 displays the refueling amount, and when the nozzle valve 3 is placed on the nozzle hook 2 after refueling, the nozzle switch 4 opens and the output signal A'' to the motor control circuit 14 disappears, causing the motor control The output signal F'' from the circuit 14 to the motor 9 is also canceled and the motor 9 is stopped.

As described above, the oil supply system of the present invention changes the rotation speed of the pump motor according to the amount of relief in the return path, so it consumes less power than the conventional case where the pump motor always rotates at full power. reduce waste, prevent wear on pumps and motors,
This can improve durability.

Furthermore, since high pressure is not applied unnecessarily inside the oil supply pipe, deterioration of the oil supply hose is prevented, the lever when opening the nozzle valve becomes lighter, and shocks such as water hammer that occur when the valve is closed are eliminated.

[Brief explanation of drawings]

The figure is an explanatory view showing an embodiment of the oil supply device of the present invention. 1...Refueling machine, 2...Nozzle hook, 3...Nozzle valve, 4...Nozzle switch, 5...Refueling hose, 6...Refueling pipe, 7...Refueling pump, 8...
Flow meter, 9... Drive motor, 10... Pulse transmitter, 11... Return path, 12... Relief valve, 1
3... Oil supply amount indicator, 14... Motor control circuit, 18... Relief amount detector.

Claims (1)

[Claims] 1. One end is connected to a nozzle valve via a refueling hose, and the other end is connected to an underground tank. A pump and a flow meter are sequentially connected in the middle of the refueling pipe, and the inflow and outflow sides of the pump are connected to a return valve with relief valves. In a refueling device that is connected to a pump by a motor, and has a display meter that displays the amount measured by a flowmeter, a relief amount detection means is provided to detect the amount of relief in the return path, and the relief amount detection means detects the amount of relief. A lubricating device characterized by being provided with a motor rotation control means that speeds up the rotation of the motor when the relief amount is below a certain value, and slows down the rotation of the motor when it exceeds a certain value.