JPH0146399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blend liquid supply system used when blending and supplying a plurality of types of liquids to, for example, a tank truck.

A characteristic of oil demand in recent years is the increasing demand for mixtures of multiple types of oil with different liquid types (for example, kerosene and diesel oil) at a specific mixing ratio. Liquid supply methods to meet this demand include the in-line blending method, in which each liquid is simultaneously supplied at a specific ratio and mixed in the liquid supply pipe, and the batch blending method, in which multiple types of liquids are individually and continuously supplied in fixed amounts. It has been known. However, in conventional liquid supply systems, no matter which type of liquid is used, multiple liquid supply devices equal to the number of liquid types are required, which is not only expensive, but also requires the operation of liquid supply for each liquid supply device. Since it has to be done independently, the amount of liquid to be supplied for each type of liquid is calculated from the total amount of liquid to be supplied and the mixing ratio.
This method has the disadvantage of requiring an extremely complicated operation of setting the calculated amount of liquid to be supplied to each liquid supply device.

This invention has been made with attention to the above points, and its purpose is to provide a new blended liquid supply system that adopts the batch blend method of the above two methods, and to provide a system for each liquid type. The flow pulse from the flowmeter is inputted to at least one of the quantitative circuits provided through a scaler whose frequency division ratio can be changed, and the output of the quantitative circuit of the system equipped with this scaler is used to input the flow pulse from the flow meter to at least one of the quantitative circuits provided. It is an object of the present invention to provide a blended liquid supply system in which the metering valve is controllable, so that the system can be provided at low cost, and the liquid supply operation can be performed easily.

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

Figure 1 is a block diagram showing a system in which a flow meter is provided for each liquid type system. In the figure, 1 is the first flow path, 2 is the second flow path, and 3 is the common flow path connected to these flow paths. For example, the first flow path 1 is connected to a kerosene tank, and the second flow path 2 is connected to a light oil tank. In addition, the first flow path 1 and the second flow path 2 include pumps 4, 5, flowmeters 6, 7, metering valves 8,
9, constant flow valves 10, 11 and check valves 12, 13
is provided. Here, the flowmeters 6 and 7 are equipped with flow rate transmitters 6a and 7a, for example, and have a flow rate of 0.1, for example.
It is designed so that an output of one pulse can be obtained per pulse. Reference numerals 14 and 15 denote a first quantitative circuit and a second quantitative circuit that control the flow of a predetermined amount of liquid into the first flow path 1 and the second flow path 2, respectively, and for example, 1000 pulses for a set amount of 1 Kl. The liquid supply is controlled until a flow rate signal of 1 is output. Each metering circuit 14, 15 is connected to a remote switch 18 having a liquid supply amount setting section 18a and a start button 18b. Furthermore, each circuit may be connected to the card reader 17 via the total amount setting circuit 16 to regulate the total loading amount.

Further, the output of the flowmeter 6 is connected to the first quantitative circuit 14 via a scaler 19, and also to one input of the first total counter 20 and the OR gate 21, and the output of the flowmeter 7 is connected to the OR gate 21. the other input of and the second total counter 2
It is connected to 2. The output of the OR gate 21 is input to the quantitative circuit 15 via the frequency divider 23. Here, the scaler 19 is a kind of frequency dividing circuit that can arbitrarily select a frequency division ratio in the range of 100/100 to 10/100, and the frequency divider 23 has a frequency division ratio fixed at 1/10. This is a frequency divider circuit. The output of the metering circuit 14 is connected to the operating end of the pump 4, the operating end of the metering valve 8, and the
Connected to the negative logic input 24a of the AND gate 24,
The output of the quantitative circuit 15 is passed through the delay circuit 25.
It is connected to the positive logic input 24b of the AND gate 24, and the output of the AND gate 24 is connected to the delay circuit 2.
6 to the operating end of the pump 5 and the operating end of the metering valve 9. The delay circuits 25 and 26 are designed to delay the signal when the operating end of the metering valve 9 is turned on or opened. 3a is a loading arm provided at the tip of the common flow path 3.

The operation will be explained when a card reader is used based on the above configuration.

Now, if the liquid types to be shipped are kerosene and light oil, and the mixing ratio is, for example, 4:6, kerosene is supplied to the first flow path 1, light oil is supplied to the second flow path 2, and The frequency division ratio of the scaler 19 is set to 25/100, that is, 1/4.

Next, the nozzle of the loading arm 3a is attached to a tank truck (not shown) or the like, and liquid supply is started. The liquid supply operation is performed by setting a card prepared for each customer in the card reader 17. For example, the maximum total loading amount corresponding to the capacity of the tank truck is recorded on this card, and this loading amount is set in each quantitative determination circuit 14, 15 via the total amount setting circuit 16. Once the card is configured, the remote switch 18
The operation becomes valid and the system operates. If the total amount of blended liquid to be supplied is, for example, 1 Kl, the liquid supply amount setting section 18a is set to 1 Kl, and the start button 18b is pressed. Then each quantitative circuit 14,1
At the output of 5, a signal appears that sets the first flow path 1 and the second flow path 2 to the liquid supply state, and in the first flow path 1, the metering valve 8 is opened and the pump 4 is operated; The output of the circuit 15 is determined by the negative logic input 24a.
Since the output of AND gate 24 is blocked, metering valve 9 and pump 5 do not operate. Therefore, first we start supplying only kerosene, but at this time the flow meter 6
outputs a flow rate signal of 0.1/P (pulse), and this signal is sent to scaler 1 with a preset frequency division ratio.
The signal is frequency-divided by 1/4 by 9 and input to the first quantitative circuit 14 as a 0.4/P signal. Since each quantitative circuit 14 and 15 has the liquid supply amount set to 1Kl, the liquid supply control is performed until a signal of 1000 pulses is input, so in the quantitative circuit 14 where a signal of 0.4/P is input, the liquid supply amount is set to 1Kl. The pump 4 and metering valve 8 are controlled so that kerosene is supplied. On the other hand, the output of the flowmeter 7, that is, the signal of 0.1/P is divided by 1/10 by the frequency divider 23 to 1/P.
Since it becomes a signal and is input to the quantitative circuit 15,
The second quantitative circuit 15 receives an input of 400 pulses while the first quantitative circuit 14 receives an input of 1000 pulses. Here, the first quantitative circuit 14 sets the set value to 1000.
When the pulse is reached, the output is reversed, stopping the operation of the pump 4, closing the metering valve 8, and
The AND gate 24 is opened and the supply of light oil to the second channel 2 is started.

At this time, since the second metering circuit 15 has already received 400 pulses, the pump 5 and metering valve 9 will be controlled so that light oil is supplied until the remaining 600 pulses are input. , during this period, 1×600 pulses, that is, 600 times, of light oil will be supplied. Therefore, first, 400 kerosene is supplied to the tank truck through the nozzle of the loading arm 3a, and the metering valve 8 is closed.
Subsequently, the metering valve 9 is opened and the predetermined blended liquid supply ends when 600 units of light oil have been supplied.
Also, if the maximum total load recorded on the card is 2Kl or 4Kl, press the start button 18b again.
When is pressed, liquid supply starts again, but if it is 1 Kl, that is, if the liquid supply amount has already reached the maximum total loading capacity, each metering circuit 14, 15 will not operate to prevent erroneous operation. . Note that the operation of the metering valves 8 and 9 is accompanied by a mechanical delay with respect to the output of the first metering circuit 14 and the second metering circuit 15;
After the metering valve 8 is completely closed due to the action of the metering valve 9, the opening operation of the metering valve 9 is performed. Also, the first total counter 20 is connected to the output of the flowmeter 6, and the second total counter 22 is connected to the output of the flowmeter 7, so the former shows the total amount of kerosene supplied, and the latter shows the total amount of light oil supplied. The amount of liquid supplied is counted and displayed.

FIG. 2 shows an embodiment in which a flow meter 27 is provided in the common flow path 3 and is shared by each system. 20 and 22 via AND gates 28 and 29, respectively. The outputs of the quantitative circuits 14 and 15 are input to one input of each of the AND gates 28 and 29 via delay circuits 30 and 31, respectively.
8 and 29 are being opened and closed. Note that delay circuit 3
0 and 31 are designed to delay the closing of the metering valves 8 and 9, respectively, and delay the closing of the AND gates 28 and 29, respectively. Therefore, the metering valve 8
While the valve is opened to supply kerosene, the AND gate 28 opens and the flow rate pulse of the flow meter 27 is counted by the first total counter 20, and while the metering valve 9 is opened to supply light oil, the AND gate 29 is open. Since the flow rate pulses are counted by the second total counter 22, the first total counter 20 counts and displays the total amount of kerosene supplied, and the second total counter 22 counts and displays the total amount of light oil supplied. In addition, each quantitative circuit 1
4, 15, metering valves 8, 9, pumps 4, 5, etc. perform the same functions as in the case of the system in which a flow meter is provided for each liquid type system, so a description thereof will be omitted.

In the embodiment, the frequency division ratio of the scaler 19 is in the range of 100/100 to 10/100, and the frequency division ratio of the frequency divider 23 is 1/10, but these frequency division ratios are not limited in any way. It is sufficient that the variable range of the frequency division ratio of the scaler 19 satisfies the blending range. Of course, it is also possible to adopt a configuration in which the quantitative operation is performed using only two quantitative determination circuits without using a card reader.

As described above, according to the present invention, a scaler capable of changing the frequency division ratio is interposed between at least one of the quantitative circuits provided for each liquid type, and a scaler capable of changing the frequency division ratio is interposed between the flowmeter and the Since it is possible to control the metering valve in the system without using a scaler using the output of the metering circuit, the liquid supply operation is as simple as setting the scaler frequency division ratio in advance and setting the total liquid supply amount. Often, the operation of blended liquid feeding can be carried out by simple operations similar to those of general liquid feeding. Moreover, since each device constituting the system can be configured with the minimum number of devices necessary for blending liquid supply, it can be provided at a lower cost than preparing the same number of liquid supply devices as the number of liquid types.

[Brief explanation of drawings]

Fig. 1 is a block explanatory diagram showing an example of a system in which a flow meter is provided for each liquid type, and Fig. 2 is a block explanatory diagram showing an example of a system in which only one flow meter is provided in a common flow path. It is. 1... First flow path, 2... Second flow path, 3... Common flow path, 4, 5... Pump, 6, 7, 27... Flowmeter, 8, 9... Metering valve, 14... ...first quantitative circuit,
15... Second quantitative circuit, 19... Scaler, 23
...Frequency divider.

Claims (1)

[Claims] 1. A batch blend liquid supply system in which a first flow path and a second flow path each provided with a flow meter and a metering valve are connected to a common flow path to mix liquids, A pulse proportional to the flow rate from the flowmeter in the first flow path is connected to the first quantitative circuit via a scaler and also connected to one end of the OR gate.
A pulse proportional to the flow rate is connected to the other end of the OR gate from a flow meter in the second flow path, and the output of the OR gate is connected to a second quantitative circuit via a frequency divider to regulate the total loading amount. A first quantitative circuit and a second quantitative circuit are connected to the total amount setting circuit, and the output signal of the first quantitative circuit is connected to the operating end of the quantitative valve in the first flow path, and an AND gate is connected via the negative logic terminal. , connect the output signal of the second quantitative circuit to the other input terminal of the AND gate, set the blend ratio per batch in the first quantitative circuit with a scaler that is smaller than the total amount, and Only the metering valve in the first flow path is opened by the output signal from the setting circuit, and when the first metering circuit reaches the set amount, the metering valve in the first flow path is closed and the metering valve in the second flow path is opened. Open the valve,
A batch blend liquid supply system characterized in that a metering valve in a second flow path is closed when the second metering circuit reaches a set amount. 2. In a batch blend liquid supply system in which liquids are mixed by connecting a first flow path and a second flow path each having a metering valve to a common flow path,
A flow meter is provided in the common flow path, and a pulse proportional to the flow rate from the flow meter is connected to the first quantitative circuit via a scaler and connected to the second quantitative circuit via a frequency divider to calculate the total loading amount. A first quantitative circuit and a second quantitative circuit are connected to the total amount setting circuit to be regulated, and the output signal of the first quantitative circuit is connected to the operating end of the metering valve in the first flow path, and is connected via a negative logic terminal. the output signal of the second quantitative circuit is connected to an AND gate, the output signal of the second quantitative circuit is connected to the other input terminal of the AND gate, and the output signal of the second quantitative circuit is connected to the first quantitative circuit.
The blend ratio per batch is set by a scaler, and only the metering valve in the first flow path is opened according to the output signal from the total amount setting circuit, and when the first metering circuit reaches the set amount, the metering valve in the first flow path is opened. A batch blend method characterized in that the valve is closed, the metering valve in the second flow path is opened, and when the second metering circuit reaches a set amount, the metering valve in the second flow path is closed. liquid supply system.