JPS61152597A - Liquid feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to a liquid supply device that performs fixed-quantity (preset) liquid supply, that is, supply of a preset amount of liquid, and is particularly applicable to a small tank truck. The present invention relates to a suitable liquid supply device.

[Prior Art 1] Small tanker trucks are used when delivering and selling kerosene and the like. The refueling device installed on this type of tanker truck starts the pump device when the worker removes the refueling nozzle from the nozzle hook, and pulls the operating lever provided on the nozzle to place the fuel in the customer's container (e.g. Refueling is carried out into a small household tank or plastic container, and when the container is full or the desired amount of refueling has been completed, the nozzle lever is released to complete refueling. In this 4, since plastic containers called standard containers with a capacity of 181 or 207 are widely used, it is desired to add a preset lubrication function to the lubrication @ station to streamline the lubrication work. There is. moreover,
This preset oil supply function is required to be highly accurate in order to minimize the difference between the preset oil supply amount and the oil supply amount actually discharged from the nozzle, that is, the oil supply error.

On the other hand, a conventional oil supply device with a preset function generally includes a pump device that transfers oil stored in a tank, a main conduit that guides the oil transferred by this pump device to a fuel nozzle, and this main pipe. A flow rate detector that detects the flow rate of oil flowing in the pipeline, a valve device that opens and closes the main pipeline, and a quantitative control device that controls the operation of the valve device based on a preset oil supply amount and the detection results of the flow rate detector. It is composed of. In such a refueling device, the following method has conventionally been adopted as a method for suppressing the above-mentioned refueling error.

■As a valve device, a two-stage stop valve that can be adjusted to fully open, half open, and fully open is used. It is fully open at the start of refueling, and then half open just before the set oil refill is completed. A method of first reducing the flow rate and then fully opening it.

■A bypass pipe is provided in a part of the main pipe, and a large flow valve and a small flow valve are provided in the main pipe and the bypass pipe, respectively.When refueling starts, both large and small valves are opened, and then refueling starts. Just before completion, only the large flow valve is closed, the flow is reduced once, and then both large and small valves are closed.

[Problems to be Solved by the Invention] By the way, when the above-mentioned methods (1) and (3) are used to reduce the refueling error, there are drawbacks as described below.

■An expensive two-stage stop valve or two valves, a large flow valve and a small flow valve, must be used, which inevitably increases manufacturing costs.

■The liquid supply nozzle is usually equipped with a check valve, so pressurized oil is confined between the valve device and the nozzle.
In particular, if a part of the pipe line connected to the nozzle is made of a stretchable rubber hose, if the rubber hose is operated to store the nozzle after the valve device is fully closed, the inside may be damaged due to the degree of expansion and contraction of the rubber hose. The pressure of the contained oil rose and the oil inside leaked from the check valve, which was dangerous.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a liquid supply device that is inexpensive and capable of safely supplying preset liquids.

Means for Solving Problem C] This invention provides a transfer means for transferring a liquid stored in a tank, a main pipe for guiding the liquid transferred by the transfer means to a liquid supply nozzle, and a main pipe for guiding the liquid transferred by the transfer means to a liquid supply nozzle. a flow rate detection means for detecting II of the flowing liquid; a return pipe line for returning a predetermined flow rate of a part of the liquid flowing from the transfer means to the flow rate detection means to the tank; and an opening/closing means for opening and opening the return pipe line. Then, based on the preset liquid supply amount and the detection result of the flow rate detection means, the opening/closing means is opened to reduce the flow rate flowing through the main pipe, and then the transfer means is stopped and the liquid supply port from the main pipe is opened. It is characterized by comprising a control means for controlling so that the liquid supply teeth are set to predetermined liquid supply teeth.

[Operation] By closing the opening/closing means under the control of the control means, the entire flow rate of the liquid transferred by the transfer means is guided to the main pipeline, passes through the flow rate detection means, and is discharged from the nozzle tip. . On the other hand, by opening the opening/closing means, a predetermined flow rate of a part of the liquid flowing in the main pipe is guided to the return path and returned to the tank without passing through the flow rate detection means, so that The liquid is discharged at a flow rate obtained by subtracting the predetermined flow rate (return flow rate) from the total flow rate of the liquid transferred by the transfer means. Therefore, after opening the opening/closing means,
By stopping the transfer means, preset liquid supply using two-stage control becomes possible.

[Embodiment] FIG. 1 is a piping system diagram showing a configuration when an embodiment of the present invention is applied to a refueling device mounted on a small tank lorry vehicle.

In the figure, 1 is a tank that stores kerosene, 2 is a vibrator 3
This is a pump device that transfers kerosene guided from a tank 1 by a, and the kerosene transferred by this pump device 2 is guided to a flow rate detector 4 by a pipe 3b. The flow rate detector 4 includes a flow rate pulse transmitter 4a that outputs a flow rate pulse signal with a number of pulses corresponding to the flow rate of kerosene passing through it, and the kerosene that has passed through the flow rate detector 4 is transmitted to a pipe 3C and a rubber hose. Refueling nozzle 5 by 3d
be led to. The fuel supply nozzle 5 is provided with an operating valve that opens when the operating lever 5a is pulled, and a pressure valve (check valve) that opens when the pressure of the supplied kerosene exceeds a predetermined pressure. A main conduit is constituted by the above-mentioned pipes 3a to 3C and the rubber hose 3d. On the other hand, a pipe 8a that guides kerosene transferred by the pump i device 2 to the manual valve 7 is connected to the pipe 3b. and,
The kerosene whose flow rate is adjusted to a predetermined value by the manual valve 7 is guided to the valve assembly N9 through the pipe 8b, and further to the tank 1 through the pipe 8C. A return conduit is constituted by the pipes 88 to 8c described above.

Further, in the figure, reference numeral 10 denotes a nozzle switch (not shown) that is turned on/off in conjunction with nozzle hooking, and is turned on when the nozzle 5 is hooked. 11 is the preset oil supply amount (18) or 20. f), a display section 12 that displays the amount of oil supplied one by one, and a pump drive circuit 13 that drives the pump device 2. Reference numeral 14 denotes a quantitative control device, which controls the opening and closing of the valve device 9 based on signals supplied from the nozzle switch 10, the setting unit 11, and the flow rate detector 4, respectively, and also controls the pump drive circuit 13 to control the pump device 2. It instructs to start and stop, further counts the number of pulses of the flow rate pulse signal supplied from the flow rate detector 4, and supplies the counting result to the display unit 12. In the figure, 15
is the customer's plastic container.

Next, the operation of the oil supply system having the above-described structure will be explained with reference to the flowchart shown in FIG. 2 and the time chart shown in FIG. 3.

First, in the initial state, the pump device 2 is stopped, the valve device 9 is open, and the nozzle 5 is opened.
is hung on the nozzle hook and the nozzle switch 10 is turned on. When the pump device 2 is started and the valve device 9 is opened, a manual valve is set so that the flow rate (return flow rate) of kerosene guided through the pipes 8b and 8c and returned to the tank 1 becomes a predetermined flow i. 7 opening degree is adjusted.

Here, when the worker turns on a preset refueling start button (not shown), the quantitative control device 14 detects this, and
The process proceeds from step SP1 shown in FIG. 2 to step SP2. Next, when the worker removes the nozzle 5 from the nozzle hook, the nozzle switch 10 is turned off, and the quantitative control device 14 detects this off signal and moves from step SP2 to step SP3.
Proceed to.

In this step SP3, the quantitative control device 14
Preset I (18) is preset in the setting section 11.
J or 20J), then step SP4
, start the pump device 2 and start the valve device 9.
Let be closed (see in Figure 3). Next, the working tool inserts the tip of the nozzle 5 into the mouth of the container 15, and the operating lever 5
By pulling the lever 5a and locking the lever 5a with a locking fitting (not shown), the internal operation valve opens and kerosene begins to be discharged from the tip of the nozzle 5 (see ■ in Figure 3).
. Next, the quantitative control device 14 counts the number of pulses of the flow rate pulse signal from the time when the flow rate pulse signal arrives from the flow rate detector 4 (step 5P5), and displays the counting result on the display unit 12.
is supplied to and displayed (step 5P6). Next, at the time when the counting result becomes a value corresponding to the pre-quantification flow rate obtained by subtracting the predetermined amount from the preset amount, step S
Proceeding from P7 to step SP8, the valve device 9 is opened (see ■ in FIG. 3). Then, out of the total flow of kerosene transferred by the pump device 2, the above-mentioned predetermined flow rate of kerosene is guided to the pipes 8a to 8c and returned to the tank 1, so that it passes through the flow rate detector 4 and reaches the valve 5. The flow rate of kerosene discharged from the tip of the kerosene decreases. (Step 5P9).

Next, after step 5P10) when the flow rate or instantaneous flow rate (hereinafter referred to as flow rate) of kerosene becomes stable,
Calculate the flow velocity (the amount shown by E in FIG. 3) at predetermined time intervals based on the pulse signal supplied from the flow rate detector 4 (Step SPI 1), and determine the overflow at each point of time based on the calculation result. Calculate the weight, and compare the predicted overrun amount at each time point obtained in this way with the preset remaining amount at each time point, that is, the stone obtained by subtracting the amount of oil refueled up to each time point from the preset amount ( Step 5P12). Next, when the predicted amount of overrun and the preset remaining amount match, the process proceeds from step SP13 to step 5P14.
Proceed to and stop the pump device 2. Thereafter, an amount of kerosene corresponding to the predicted passing amount is discharged from the tip of the nozzle 5 into the container 15.

Here, if there is no need to continue refueling, step SPI can be performed by hanging the nozzle 5 on the nozzle hook without turning on the preset refueling start button.
5, the process proceeds to step SP16, and the preset oil supply operation is completed. On the other hand, if you wish to continue preset lubrication, by turning on the preset lubrication start button, step SPI 5 to step SPI
Proceed to step SP3, and if the preset amount set in the setting section 11 has been changed at this point, proceed to step SP3.
If no change has been made, the process proceeds to step SP4, and thereafter the same operation as the preset oil supply operation described above is repeated.

In the above-described operation process, if the preset refueling start button is not turned on in step SPI, the process advances to step 5P18. This step 5P
In step 18, the pump device 2 is activated during normal refueling operation, that is, when the nozzle 5 is removed from the nozzle hook, (
Valve device 9 is closed) Operating lever 5 of refueling nozzle 5
The operation of refilling kerosene is performed only during the period when a is being drawn.

In addition, in step SP10, if the flow rate of kerosene is not stable, the process advances to step 5P19, and this step 5P
At 19, the current oil supply amount is the pump stop Wt
In other words, if the flow has not reached the preset flow m, taking into account a predetermined overflow amount, the process proceeds to step 5P10 again, and if the pump stop flow rate has been reached, the process proceeds to step SP.
14, and the pump device 2 is stopped.

Note that whether the flow rate of kerosene has become stable is determined by whether the pulse interval of the flow rate pulse signal from the flow rate detector 4 has become constant, or whether the flow rate calculated from the flow rate pulse signal has become constant. . Further, in the above embodiment, the overflow prediction port is calculated from the flow rate of kerosene in steps SPIO to SP13 to perform stop control of the pump device 2. However, if the overflow amount is known in advance, the preset amount The pump device 2 may be controlled to be stopped when the supplied liquid ω reaches ω, which is obtained by subtracting the above-mentioned travel time from ω.

According to the embodiment described above, the kerosene refueling flow rate can be set in two stages using only one single-stage stop valve, without using an expensive two-stage stop valve or two valves, a large flow valve and a small flow valve. Since it can be adjusted, it is possible to reduce refueling errors during preset refueling with an inexpensive configuration, and the pressurized kerosene is no longer confined within the elastic rubber hose 3d as in the past. When the rubber hose 3d is operated, the expansion and contraction of the rubber hose 3d prevents internal oil from leaking from the pressure valve of the nozzle, and this also helps reduce oil supply errors.

Furthermore, since there is no need to provide a valve to adjust the flow rate in the main pipe line consisting of the vibrators 3a to 3d, etc., the occurrence of water hammer effect is suppressed, and this reduces the risk of oil leakage from pipe connections and stress generated in the pipes. It is possible to reduce the negative impact on each part of the piping.

[Effects of the Invention] As explained above, according to the present invention, there is provided a transfer means for transferring the liquid in the tank, a main pipe line for guiding the liquid transferred by the transfer means to the liquid nozzle, and a main pipe line for guiding the liquid transferred by the transfer means to the liquid nozzle. a flow rate detection means for detecting the flow rate of the flowing liquid; and a flow rate detection means for detecting the flow rate of the flowing liquid; A return pipe line that returns a predetermined flow rate of a part of the liquid flowing into the detection means to the tank, an opening/closing means that opens and closes the return pipe line, and a preset liquid supply amount and a detection result of the flow rate detection means. control means for controlling the opening/closing means to open the opening/closing means based on the flow rate to reduce the flow rate flowing through the main pipe, and then stop the transfer means so that the amount of liquid supplied from the main pipe becomes a predetermined amount of liquid supplied; Since this is provided, safe preset liquid supply can be performed with an inexpensive configuration, and the occurrence of water hammer action can be suppressed, thereby achieving the effect of reducing adverse effects on various parts of the piping.

[Brief explanation of the drawing]

FIG. 1 is a piping system diagram showing the configuration of an embodiment of the present invention.
FIGS. 2 and 3 are a flow chart and a time chart explaining the operation of the same embodiment. 1...Tank, 2...Pump device, 3
a~3C...Pipe, 3d...Rubber hose, 4...Flow rate detector, 5...Refueling nozzle, 7...Manual valve , 8a-8C...
... Vibrator, 9... Pulp device, 10...
... Nozzle switch, 11 ... Setting section, 12
. . . Display section, 13 . . . Pump drive circuit, 14 . . . Quantitative control device.

Claims (1)

[Claims] a transfer means for transferring the liquid stored in the tank; a main pipe line for guiding the liquid transferred by the transfer means to a liquid supply nozzle; a flow rate detection means for detecting the flow rate of the liquid flowing in the main pipe line; a return conduit for returning a predetermined flow rate of a part of the liquid flowing from the transfer means to the flow rate detection means to the tank; an opening/closing means for opening and closing the return conduit; and a preset liquid supply amount and the flow rate detection means. Based on the detection result, the opening/closing means is opened to reduce the flow rate flowing through the main pipe, and then the transfer means is stopped and the amount of liquid supplied from the main pipe is controlled to be a predetermined amount of liquid supplied. A liquid supply device characterized by comprising: a control means for controlling.