JPH0442275B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a fixed-quantity liquid supply device that is installed at a filling station such as a gas station and can automatically supply a set amount of fuel.

[Prior Art] It is known that in such a device, the flow rate is decreased to improve metering accuracy when the amount is a predetermined amount before the set amount. To this end, techniques have been proposed in which two discharge ports with different diameters are opened and closed using electromagnetic solenoids, respectively, to change the discharge amount, and techniques in which the flow rate is varied by controlling the rotational speed of the pump. However, these devices are complex in structure and control.

[Problems to be Solved] Accordingly, an object of the present invention is to provide a quantitative liquid supply device that can supply a preset amount of liquid accurately with a relatively simple structure.

[Means for Solving the Problems] According to the present invention, in a metering liquid supply device that includes a liquid supply pump motor and a flow meter and automatically stops liquid supply when a preset liquid supply amount is reached, the flow meter A valve is provided in the outflow side passage of the valve, and the inlet side of the valve and the outflow side of the valve are connected in order to maintain a small amount of flow between the inlet passage and the outlet passage of the valve when the valve is closed. A small hole is formed for communication, and when the liquid supply amount reaches a preset liquid supply amount, the valve is closed, and when the liquid supply amount reaches the preset liquid supply amount by the liquid supply from the small hole, the above-mentioned valve is closed. A control device is provided to stop driving the feed pump motor.

[Explanation of effects] Therefore, the valve is fully open during the liquid supply operation,
Liquid supply work is performed at a large flow rate. Then, when the amount of liquid to be supplied is equal to or less than the preset amount of liquid to be supplied, the control device closes the valve. However, even when the valve is closed, a small amount of liquid flows through the small hole. When the set liquid supply amount is reached in this manner, the liquid supply pump motor of the control device is stopped, and thus the liquid supply work is completed.

In this way, according to the invention, the valve is closed before reaching the predetermined amount of liquid supplied, and a small amount of liquid is supplied from the small hole, so there is no error due to inertial force or problems such as water hammer, and the process is short. Accurate quantitative liquid supply can be performed on time.

Moreover, due to the structure, it is easy to process the valve by simply forming a small hole in the valve, and it is also easy to improve the valve of the prior art.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a fixed-quantity liquid supply device for carrying out the present invention. and discharge piping 5 are connected. This discharge piping 5 is provided with a flow meter 6 and a valve 20, and a hose 7 is further connected to the discharge piping 5. A nozzle 8 is connected to the hose 7, and the refueling machine 1 is provided with a nozzle switch 9 that detects when the nozzle 8 is removed from the refueling machine 1.

The flow meter 6 is provided with a pulse transmitter 10 that converts the flow rate into a pulse signal, and the pulse transmitter 1
The pulses emitted from 0 are sent to the display 11 via the control device 30, and the flow rate measured by the flow meter 6 is digitally displayed on this display 11. It is now possible to set the amount of oil supplied.

In FIG. 2, the valve 20 is formed with an inlet flow path 21 and an outlet flow path 22 orthogonal to each other.
A valve mechanism is provided on the axis of the valve. This valve mechanism has a valve seat 23 provided at the end of the inlet channel 21.
, a valve body 24 seated on and off the valve seat 23, and a valve body 24
The electromagnetic solenoid 27 operates the electromagnetic solenoid 27. Further, in order to obtain a small flow rate of outflow when inactive, a recess 25 is formed on the axis of the valve body 24.
Small holes 26, 26 are opened in the recess 25. Note that instead of opening the small hole 26, a gap may be provided between the valve body 24 and the valve seat 23, which is formed when the valve is not in operation. The electromagnetic solenoid 27 is connected to a control device 30, and when the solenoid 27 is energized, the valve body 24 is held at the chain line position and the valve 20 is activated.
Fully open the flow rate to a large flow rate (e.g. 45/min)
When not in operation, the valve body 24 is seated by its own weight and the flow rate is reduced to a small flow rate (for example, 3/3
min). In addition, 5
0 is the valve body 2 for liquid to open and close the valve smoothly.
This is the passage leading behind 4.

In FIG. 3, a control device 30 is provided with a central processing unit (CPU) 31 and an input/output device (I/O).
Each of the devices 2, 9, 10, 11, 1 via 32
2 and 27. Therefore, signals from each device 9, 10, 11 are input to the central processing section 31 via the input/output device 32, and signals from the central processing section 31 are input to each device 2, 11, 11 via the input/output device 32. It is becoming possible to convey this to people in their 20s.
In addition to the central processing unit 31, the control device 30 also stores a control program, a ROM 33 that stores a predetermined amount before setting the valve 20 to a small flow rate, and a set amount of oil to be supplied, the amount of oil to be supplied, etc. RAM (RAM) 3
4 are provided.

Next, the operation will be explained with reference mainly to the control flowchart shown in FIG. 4 and the control timing chart shown in FIG.

Press the preset button 12 to set the desired amount (step S1), remove the nozzle 8, and the nozzle switch 9 will turn on.
It turns on (step S2), and the central processing unit 31 outputs a control signal to the motor 2 and valve 20 to turn on the motor 2 and open the valve 20 (step S3 and time t1). Next, when the nozzle valve of the nozzle 8 is opened, oil supply at a large flow rate (45/min) is started from the valve 20 (time t2). Flow rate pulses from the pulse transmitter 10 of the flow meter 6 are counted and displayed on the display 11. When the fuel is supplied to a certain amount before the set amount (step S4), the central processing section 31 outputs a control signal to turn off the valve 20 (inactive) (step S5 and time t3). Then, the valve body 2 of the valve 20
4 is seated and the flow rate from the small hole 26 is reduced to a small flow rate (3/min). Next, it is determined whether the set amount has been reached (step S6), and if YES, a control signal is output to motor 2 to turn motor 2 on.
It is turned OFF (step S7 and time t4), and finally the nozzle 8 is turned on and the nozzle switch 4 is turned OFF, thus ending the control.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain a metering liquid supply device that can accurately supply a fixed amount of liquid without any error due to inertial force or water hammer, with a simple configuration of providing a small hole in the valve. be able to. The structure is simple, so there are no failures, and the number of parts is small.
Can be made lighter.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing an example of a metering liquid device implementing the present invention, Fig. 2 is a side sectional view showing details of the valve, Fig. 3 is a control block diagram, and Fig. 4 is a control flowchart. FIG. 5 is a control timing chart. 2...Motor, 3...Pump, 20...Valve, 2
4... Valve body, 26... Small hole, 27... Electromagnetic solenoid, 30... Control device.

Claims (1)

[Claims] 1. In a quantitative liquid supply device that is equipped with a liquid supply pump motor and a flowmeter and automatically stops liquid supply when a preset liquid supply amount is reached, a valve is provided in the flow path on the outflow side of the flowmeter, and the valve In order to maintain a small amount of flow between the inlet and outlet channels of the valve when the valve is closed, a small hole is formed that communicates the inlet side of the valve with the outlet side of the valve, and a preset supply A control device is provided that closes the valve when the liquid supply amount reaches a predetermined liquid supply amount, and stops driving the liquid supply pump motor when the preset liquid supply amount is reached by the liquid supply from the small hole. A quantitative liquid supply device characterized by being provided with.