JPH0321437B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid supply device, and relates to a fluid supply device that is installed in an oil depot, for example, and is suitable for use when refueling a tank lorry.

When refueling a tank truck using a loading arm at an oil depot, in order to prevent the risk of fire caused by static electricity, the valve should not be fully opened at the beginning of refueling, but the discharge amount should be below a certain level. In the mid-term, that is, after a certain amount of oil has been refilled, the valve is fully opened with a large discharge amount to shorten the refueling time, and in order to soften the shock when the valve is closed and to close the valve at exactly the set amount of refueling. At the end of the refueling process, the valve is throttled down to supply refueling at a discharge rate below a certain level.

Furthermore, a flowmeter has a fixed flow rate range of accuracy, and if the flow exceeds the flow rate range, the measurement accuracy will be extremely poor. However, since refueling time can be shortened by refueling with as large a discharge amount as possible, it is ideal to refuel at a flow rate close to the maximum value of the flowmeter. The inflow pressure to the flowmeter varies depending on the driving conditions of the pump and pump drive motor, etc., and furthermore, if multiple lubrication devices are installed on the discharge side of the pump, the usage conditions of the other lubrication devices. A flow rate control valve whose opening degree changes depending on the pressure difference with the outflow side is provided to control the flow rate through the flow meter. Conventional flow control as described above uses an on-off valve that is mechanically connected to a flow meter and a flow control valve that mechanically connects the pressure difference to a valve on-off mechanism, so it is not possible to accurately control the flow rate. It is difficult to control, the flow rate is too high, and the measurement accuracy deteriorates.
There were inconveniences such as the flow rate being too low and the refueling time taking a long time.

In this way, in the liquid supply system, liquid is supplied at a relatively small flow rate at the beginning, then at a large flow rate in the middle period, and again at a small flow rate at the end before reaching the predetermined liquid supply amount. (For example, Tokkai Sho
56-84298 and Japanese Patent Publication No. 52-34223). However, according to the prior art, for example,
In oil depots, the discharge pipes of a plurality of pumps are connected together in parallel to a plurality of liquid supply devices, or one pump supplies liquid to a plurality of liquid supply devices. The number of pumps and the number of liquid supply devices is 1:
If the system is operated without taking the above measure, the flow rate of the liquid supplied to each liquid supply device will change depending on the number of drives of the pump and the liquid supply device. Of course, normally the pump is driven according to the number of liquid supply devices, but variations in the flow rate to each liquid supply device are still unavoidable. If the flow rate becomes faster, the flow rate measurement range of the flowmeter may be exceeded and the accuracy may be lost, and the rotation of the flowmeter may increase, which may cause damage to the flowmeter. If the flow rate is slow, the refueling time will be longer.

Therefore, changes in the flow rate of the supply liquid have a negative effect on metering accuracy, refueling time, and the life of the measuring equipment.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a liquid supply device that can perform stable liquid supply work by maintaining the discharge flow rate at approximately a predetermined value during liquid supply.

According to the present invention, a flow meter and a flow control valve are sequentially installed in the liquid supply piping, and in a fixed-rate liquid supply device that supplies liquid at a low speed at the start and end of refueling and at a high speed during that time, measurement is performed using a flowmeter. A transmitter that transmits the flow rate as a flow rate signal, a supply liquid volume counting circuit that counts the flow rate signal, a flow rate calculation circuit that calculates the flow velocity based on the flow rate signal, and a supply liquid volume value that calculates the flow rate of the supplied liquid. A memory circuit that stores air according to the flow rate, a flow control valve provided in the liquid supply pipe, a drive mechanism for the flow control valve, a first switching valve that supplies air to the drive mechanism, and a flow control valve that supplies air from the drive mechanism. a second switching valve for discharging the liquid, and a flow rate calculated by a flow rate calculation circuit by comparing the amount of supplied liquid stored in the memory circuit with the amount of supplied liquid stored in the supplied liquid amount counter circuit, and the flow rate is stored in the memory circuit. and a control device for driving the first and second switching valves so that the flow rate is set to a flow rate corresponding to the amount of the supplied liquid.

Therefore, the amount of liquid to be supplied that is stored during the liquid supply operation is compared with the actual amount of liquid to be supplied by the liquid supply amount counter circuit,
If the flow velocity at that time is small, the first switching valve is operated to drive the flow control valve in the opening direction to increase the flow velocity, and if it is large, the second switching valve is operated to close the flow control valve. direction to reduce the flow velocity. Therefore, the flow rate substantially matches the flow rate stored in the memory circuit, and as a result, an extremely stable liquid supply operation can be performed.

Furthermore, since the control is performed using air pressure, there is no spark caused by relay contacts, etc., even when handling flammable liquids such as gasoline.
Preferable for safety.

As described above, according to the present invention, it is possible to perform liquid supply work at a flow rate of substantially a predetermined value, and there is no need for manual valve operation, and at a predetermined flow rate according to a preset liquid supply pattern. Automatic liquid supply is possible.

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

FIG. 1 shows a liquid supply device according to a first embodiment of the present invention,
For example, a oil supply device is shown, the base end of the oil supply pipe 1 is connected to an oil storage tank (not shown), and the pipe 1 is provided with a pump, a strainer, etc. (also not shown), and the pump is not operated. The oil in the oil storage tank is pumped up and supplied to the tank lorry T via a piping 1 from a dewatering arm 2 provided at the tip of the piping 1. The piping 1 is provided with a flow meter 3 and a flow control valve 4, and the control valve 4 operates based on predetermined oil supply data stored in advance in a storage circuit and a control signal from the flow meter 3, the details of which will be described later. Opening and closing are controlled, and refueling is performed according to a predetermined refueling pattern. The flowmeter 3 is provided with a pulse transmitter 5 that converts the flow rate of oil flowing in the pipe 1 measured by the flowmeter 3 into a pulse signal, and the pulse signal from the pulse transmitter 5 is sent to a counting circuit 6. A counting circuit 6 counts the amount of oil supplied (), and a display meter 7 digitally displays the amount of oil supplied (). Further, the pulse signal from the pulse transmitter 5 is sent to a flow rate (/min) calculation circuit 8 (hereinafter simply referred to as the calculation circuit), and the calculation circuit 8 determines the flow rate (since the cross-sectional area of the pipe 1 is constant, the flow rate per unit time). (/min) means flow velocity).

The oil supply amount signal is based on the oil supply amount () counted by the counting circuit 6 and the flow rate (/) calculated by the calculation circuit 8.
A flow velocity signal based on
In order to carry out refueling according to a preset refueling pattern, data on the refueling pattern is stored, and a signal based on the data is sent to the microcomputer 9. 3 which is switched on and off by a signal from the microcomputer 9
Switching valves 11, 12, 13 are provided.
An air source 14 is connected to the first switching valve 11, and when the valve 11 is switched from the illustrated position to the on state, air passes through the valve 11 and is supplied to a control valve drive mechanism 17, which will be described later. In addition, the second switching valve 12 is connected to the atmosphere through the air in the control valve drive mechanism 17 and the variable throttle 15 which is a speed controller in the off state shown in the figure, and the third switching valve When the control valve drive mechanism 13 is in the off state shown in the figure, the air within the control valve drive mechanism 17 is directly released to the atmosphere. In the illustrated example, the control valve drive mechanism 17 is composed of a piston-cylinder mechanism including a piston 18 that receives air pressure and a spring 19 that opposes the air pressure.
The control valve drive mechanism 17 is actuated by air pressure supplied from the air source 14 through the valve 11 and the variable throttle 16, which is a speed controller, to open the flow control valve 4, and conversely, the air drives the valve 12 and the speed controller 15. The flow rate control valve 4 is configured to close when the flow rate control valve 4 is discharged to the atmosphere through the flow rate or through the valve 13. Variable aperture 15 which is a speed controller,
By adjusting 16, the valve opening/closing speed of the flow rate control valve 4 is adjusted.

As mentioned above, the capacity of one divided tank of a tank truck is usually determined to be 1Kl or 2Kl, so a selection switch 20 for selecting 1Kl or 2Kl is provided.
The selected selection signal is sent to the microcomputer 9 and stored therein, and a start switch 21 is provided so that a start signal is sent to the microcomputer 9.

FIG. 2 shows an example of a refueling pattern prestored in the memory circuit 10 and the on/off states of the switching valves 11, 12, 13 when refueling is performed based on the refueling pattern, and FIG. Each refueling step is shown below. The mode of oil supply will be described below with reference to FIGS. 2 and 3 and FIG. 1 described above.

When the loading arm 2 is inserted into the tank truck T and the refueling amount is selected as 1Kl or 2Kl with the selection switch 20, the signal is transmitted to the microcomputer 9 and stored in memory (step _S1 ), and when the start switch 21 is pressed again (Step S ₂ ), the signal is transmitted to the microcomputer 9, and at the same time, a pump (not shown) is activated to pump oil from the oil storage tank. Each switching valve 11, 12, 13 is switched from the illustrated position to the on state by an air supply signal from the microcomputer 9, and the first switching valve 11 is opened and the second and third switching valves 12, 13 are closed and air is turned on. From source 14 to valve 11 and speed controller 1
Control drive mechanism 1 by air supplied through 6
7 is activated to open the flow rate control valve 4 and start refueling (step S ₃ ). Flow velocity from calculation circuit 8 (/
min) signal and the data of the memory circuit 10, for example 200
The microcomputer 9 compares and determines the flow rate (/min) from the arithmetic circuit ₈ (step S4).
min) signal reaches 200/min, the air supply signal to the first switching valve 11 is stopped (step S ₅ ), and the valve 11 is turned off and closed. In this state, the flow rate control valve 4 is operated at a low flow rate to prevent the generation of static electricity.
It is opened to an opening that supplies oil at a rate of 200/min.

The microcomputer 9 compares and judges the supply amount () signal from the counting circuit 6 and the data in the memory circuit 10, for example 200, and when the supply amount () signal from the counting circuit 6 reaches 200 (step S ₆ ), Send the air supply signal to the first switching valve 11 (step
S ₇ ), the valve 11 is turned on and opened, and the air source 14
The control valve drive mechanism 17 is actuated by the air supplied through the valve 11 and the speed controller 16 to further open the flow rate control valve 4. The flow velocity (/min) signal from the arithmetic circuit 8 and the data in the memory circuit 10, for example 1000/min, are compared and determined by the microcomputer 9 (step _S8 ), and the flow velocity (/min) signal from the arithmetic circuit 8 is determined to be 1000/min. /min, the air supply signal to the first switching valve 11 is stopped (step _S9 ), and the valve 11 is turned off and closed. In this state, the flow rate control valve 4 is opened to an opening degree that supplies oil at a rate of 1000/min.

When the amount of oil in the counting circuit 6 is subtracted from the selected amount of oil stored in the microcomputer 9, for example 2 Kl, and the remaining amount is 300, for example (step
_S10 ), the air supply signal from the microcomputer 9 to the second switching valve 12 is stopped (step _S11 ), and the air supply signal from the microcomputer 9 to the second switching valve 12 is stopped (step S11).
2 is turned off and opened, and the air in the control valve drive mechanism 17 passes through the valve 12 and the speed controller 15 to the atmosphere, thereby narrowing the opening degree of the flow control valve 4. Flow rate from calculation circuit 8 (/min)
The signal and the data in the memory circuit 10, for example 200/
The microcomputer 9 compares and determines the flow rate ₍ /
min) signal reaches 200/min, an air supply signal is sent again to the second switching valve 13 (step S ₁₃ ), and the valve 12 is turned on and closed. In this state, the flow rate control valve 4 is opened to an opening degree that supplies oil at a rate of 200/min.

When the discharge amount, for example, the remaining amount while the flow rate control valve 4 is completely closed after the valve opening signal of the flow rate control valve 4 is issued (step _S14 ), the second and third switching valves are controlled by the microcomputer 9. The air supply signal to the valves 12 and 13 is stopped (step S ₁₅ ), the valves 12 and 13 are turned off and opened, and the air in the control valve drive mechanism 17 is released from the second and third switching valves 12 and 13 to the atmosphere. The flow rate control valve 4 closes. This completes refueling.

By the way, as shown in FIG. 2, the flow rate control valve 4 is
When lubricating at an opening of 1000/min, fluctuations may occur in the flow rate (/min) for various reasons. Therefore, the flow control valve 4 is made to function as a constant flow valve, and the flow rate is controlled to a range of, for example, 950 to 1050/min. When the flow velocity (/min) signal from the calculation circuit 8 becomes 1050/min or more (step _S16 ),
Second switching valve 12 from microcomputer 9
The air supply signal to the valve ₁₂ is stopped (step S17), and the air supply signal to the valve 12 is stopped.
is opened, and the air in the control valve drive mechanism 17 flows to the valve 1.
2. The air passes through the speed controller 15 to the atmosphere, and the flow rate control valve 4 is throttled. When the flow rate (/min) signal from the arithmetic circuit 8 reaches 1000/min (step _S18 ), an air supply signal is sent from the microcomputer 9 to the second switching valve 12 (step S18).
S ₁₉ ), valve 12 closes. Conversely, when the flow rate (/min) signal from the arithmetic circuit 8 becomes 950/min or less (step _S20 ), an air supply signal is sent from the microcomputer 9 to the first switching valve 11 (step S20).
_S21 ), the valve 11 is turned on and opened, air is supplied from the air source 14 to the control valve drive mechanism 17 via the valve 11 and the speed controller 16, and the flow rate control valve 4 is opened to increase its opening degree. It will be done. And the flow rate (/min) signal from the calculation circuit 8 is 1000
/min (step S ₂₂ ), the air supply signal from the microcomputer 9 to the first switching valve 11 stops (step S ₂₃ ), and the valve 11 is turned off and closed. In this way, the flow rate control valve 4 is given the function of a constant flow rate valve, and the flow rate is always controlled within the range of 950 to 1050/min.

As explained above, the present invention provides a liquid supply device in which a flowmeter and a flow control valve are sequentially provided in a liquid supply pipe.
A memory circuit that stores the flow rate state of the liquid flowing in the pipe, and a control device that receives the data stored in the memory circuit and the flow rate signal from the flow meter and sends a valve control signal to the flow control valve. Because it is equipped with a preset system, it is possible to automatically supply liquid according to a preset liquid supply pattern from the start of liquid supply to the end of liquid supply, without requiring any manual valve operation. Therefore, even a worker who is skilled in the art can perform the liquid supply work appropriately and efficiently.

[Brief explanation of the drawing]

FIG. 1 is a wiring and piping diagram of a liquid supply device according to a first embodiment of the present invention. Figure 2 shows an example of a refueling pattern stored in the memory circuit used in the fluid supply device shown in Figure 1, and a switching valve that controls the drive mechanism of the flow rate control valve when refueling is performed according to the refueling pattern. It is a graph showing on/off states. Third
The figure is an explanatory diagram showing an example of a refueling step. 1... Refueling pipe, 2... Loading arm,
3...Flowmeter, 4...Flow control valve, 5...Pulse transmitter, 6...Counting circuit, 7...Display meter, 8...
Arithmetic circuit, 9...Microcomputer, 10...
...Memory circuit, 11, 12, 13...Switching valve, 1
5, 16...Speed controller, 17...Flow control valve drive mechanism, 18...Piston, 19...
Spring, 20... Lubrication amount selection switch, 21
...Start switch.

Claims (1)

[Claims] 1 Install a flow meter and a flow control valve in the liquid supply piping,
A metering liquid supply device that supplies liquid at low speed at the start and end of liquid supply, and at high speed during that time, uses a transmitter that transmits the flow rate measured by a flowmeter as a flow rate signal, and counts that flow rate signal. A supply liquid amount counting circuit,
A flow rate calculation circuit that calculates the flow rate based on the flow rate signal, a memory circuit that stores the flow rate in the liquid supply according to the liquid supply amount value, and a flow rate control valve provided in the liquid supply piping;
A drive mechanism for the flow rate control valve, a first switching valve that supplies air to the drive mechanism, a second switching valve that releases air from the drive mechanism, and an amount of liquid to be supplied that is stored in the storage circuit. control to drive the first and second switching valves so that the flow velocity calculated by the flow velocity calculation circuit by comparing the amount of supplied fluid with the supplied fluid amount of the supplied fluid amount counting circuit becomes the flow velocity stored in the storage circuit; What is claimed is: 1. A liquid supply device comprising: a liquid supply device, characterized in that the flow rate in the liquid supply is determined to be a flow rate according to the amount of liquid supplied.