JPS6210365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automatic quantitative liquid supply device.

Conventionally, a metering pump or the like has been used to supply a predetermined amount of liquid, but there is a problem that a large amount of liquid remains in the delivery path, making it impossible to measure with high precision. There were many problems when the amount was large or when it was necessary to increase the discharge pressure during supply.

This invention solves the above-mentioned problems, and supplies a predetermined amount of liquid with extremely high precision, such as a small amount remaining in the liquid delivery path, which requires a large amount of liquid to be supplied and a high discharge pressure. The object of the present invention is to provide an automatic fixed-quantity liquid supply device with a relatively simple configuration that can be reliably performed even in cases where the liquid is supplied in a fixed amount.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numerals 1 and 1 designate a pair of left and right measuring containers, the upper portions of which are formed with a small diameter and open at the top. Liquid supply containers 2, 2 are airtightly formed surrounding the openings of the metering chambers 1, 1.
Reference numeral 3 denotes a liquid introducing means, and this means 3 has a suction side of a pump 5 communicating with a liquid tank 4 into which liquid is fed from a stock liquid tank (not shown), and a discharge side of this pump 5 branching into left and right introduction pipes 6, 6. , these introduction pipes 6, 6 are opened to protrusions 2a, 2a which protrude below the bottoms of the liquid supply containers 2, 2 via first electromagnetic valves SOiV1, SOiV1. 7, 7 are liquid discharge means, and these means 7, 7 are located between the openings of the introduction pipes 6, 6 of the liquid introduction means 3 to the protrusions 2a, 2a and the first electromagnetic valves SOiV1, SOiV1. A second solenoid valve SOiV is connected to the discharge pipes 8 and 8 whose upper ends communicate with each other.
2, SOiV2 are provided respectively, and a discharge pipe 8,
The lower end of 8 is opened onto liquid tank 4 . 9
is a compressed gas supply device, in which the discharge side of a pressure tank 32 communicating with the air compressor 10 is branched into left and right pipes 11, 11, and these pipes 11,
11 is opened to a portion of the liquid supply containers 2, 2 below the upper surface of the opening of the measuring containers 1, 1 through the third electromagnetic valves SOiV3, SOiV3. Reference numeral 12 denotes a liquid delivery path, and the delivery pipes 13, 13 of this delivery path 12 penetrate the upper lids 14, 14 of the liquid supply containers 2, 2, and are inserted into the measuring containers 1, 1 from these openings. , 13 are opened into the recesses 1a, 1a provided in the bottoms of the measuring containers 1, 1, and these recesses 1
Drain discharge plugs 34, 34 are removably screwed onto a, 1a. Connecting pipes 15, 15 are connected to the upper ends of the delivery pipes 13, 13, and these connecting pipes 15, 15 are connected to sixth solenoid valves SOiV6, SOiV.
6 to one delivery hose 16, and a nozzle 17 is provided at the tip of this hose 16. the wall 18 of the liquid supply container 2, 2;
Upper lids 14, 14 are airtightly and removably fixed to 18 through packings 19, 19, and capacity adjusting cylinders 21, 21 are screwed to the upper ends of chamber walls 20, 20 of measuring containers 1, 1 so as to be able to rise and fall. and the upper lid 14,1
Pipe lines 11, 11 of the compressed gas supply device 9 are opened between the cylinders 22, 22 protruding from the lower surface of the compressed gas supply device 4 and the capacity adjustment cylinders 21, 21. An inverted conical cylinder 2 is located closer to the center than the cylinders 22, 22 on the lower surface of the upper lids 14, 14.
3 and 23 are protruded, and the upper lid 1 is located closer to the center than these.
Small chambers 24, 24 are formed on the fifth chamber 4, 14, and these small chambers 24, 24 communicate with the liquid supply containers 2, 2 via communication holes 25, 25, and the fifth
Second exhaust pipe 2 with solenoid valves SOiV5, SOiV5
6 and 26, respectively, and the liquid delivery path 1
A fourth solenoid valve is located at the upper end of the two delivery pipes 13, 13.
SOiV4, first exhaust pipe 27, 27 with SOiV4
are in communication with each other, and the first and second exhaust pipes 26, 26, 2
7 and 27, respectively, and constitute an exhaust means 28. The liquid level detectors 29 and 29
is provided to protrude downward, and the nozzle 17 is provided with a push button switch 30. In addition, 31 in Figure 1
is the control panel.

Next, the operation of the liquid supply device configured as above will be explained. When the measuring containers 1, 1 and the liquid supply containers 2, 2 are empty, push button switch 30 is pressed.
When pressed, the pump 5 operates and the first electromagnetic valve SOiV1 on the left side opens, so that the liquid introducing means 3
Liquid is supplied from the liquid tank 4 to the liquid supply container 2 on the left side through a conduit 6. In this case, the second, third, and sixth solenoid valves SOiV2, SOiV3, SOiV
6 is closed, and the fourth and fifth solenoid valves SOiV4,
SOiV5 opens simultaneously with the first solenoid valve SOiV1. When the amount of liquid supplied into the liquid supply container 2 increases, the liquid level reaches the opening of the measuring container 1, and the liquid is supplied into the measuring container 1 from this opening. When the measuring container 1 is filled with liquid to the upper end or slightly beyond it, the liquid level detector 29 detects this and the first electromagnetic valve is activated.
SOiV1 is closed to stop the supply of liquid to the left liquid supply container 2, and the second electromagnetic valve SOiV2 is opened. As a result, the liquid in the liquid supply container 2 on the left side is returned by gravity into the liquid tank 4 via the conduit 8 of the liquid discharge means 7, and the liquid supply container 2 is emptied. In this case, no liquid is discharged from the measuring container 1, and the measuring is completed. This is detected by an appropriate detection means (not shown) such as a timer or a phototube switch, and the metering completion lamp is turned on, and the second solenoid valve SOiV2, third and fourth solenoid valves SOiV3,
Close SOiV4. In this state, push button switch 30
When pressed, the third and sixth solenoid valves SOiV3, SOiV
6 is opened and the pressure tank 32 of the compressed gas supply means 9 is opened.
Compressed air is supplied into the liquid supply container 2 on the left side through the conduit 11, and pressurizes the liquid level in the metering chamber 1.
Therefore, the liquid in the measuring container 1 is transferred to the liquid delivery path 12.
The liquid is delivered from a nozzle 17 through a delivery pipe 13, a connecting pipe 15, and a delivery hose 16, and is supplied from this nozzle 17 to a required tank or container. The third and sixth electromagnetic valves SOiV3 and SOiV are activated by detecting that there is no liquid in the left measuring container 1 and the liquid delivery path 12 using an appropriate detection means such as a timer.
6 is closed, and the liquid supply completion buzzer is activated. After a short time, the first, fourth, and fifth solenoid valves SOiV on the left side
1. Repeat the above operation by opening SOiV4 and SOiV5. In addition, for the second and subsequent operations, compressed air remains in the left measuring container 1, liquid supply container 2, etc., but this is removed by the exhaust means by opening the fourth and fifth solenoid valves SOiV4 and SOiV5. Since the exhaust is exhausted from the first and second exhaust pipes 26 and 27 of 28, the liquid can be supplied to the liquid supply container 2 and the measuring container 1 without any problem.

The above explanation was about the series on the left, but
When the liquid supply container 2 and measuring container 1 in the right series are empty, the liquid level detector 29 detects that the left measuring container 1 is filled with liquid, and the first electromagnetic valve SOiV1 on the left is closed. By opening the first solenoid valve SOiV1 on the right side immediately or after a short time,
In the same manner as in the case of the left-hand series described above, the right-hand measuring container 1 is also metered and filled with liquid, and the remaining liquid is discharged from the liquid supply container. Even if the measuring containers 1, 1 of both the left and right series are filled with liquid and the liquid supply containers 2, 2 are empty and the measurement is completed, the liquid is filled alternately from the side where the measurement was completed first. These controls are performed by electrical means provided in the control panel 31.

In addition, in this invention, in the above embodiment, the left,
Although two series on the right are provided, there may be one series or three or more series. Further, the liquid may not be introduced into the liquid supply container using a pump, but may be introduced by gravity due to gravity. Furthermore, depending on the liquid to be metered, a compressed gas such as nitrogen may be used, and a valve operated by compressed gas may be used instead of a solenoid valve, which may easily catch fire. It is preferable to prevent ignition and explosion when used with liquids.

As explained above, according to the automatic metering liquid supply device of the present invention, the liquid supply means is used to introduce liquid into the liquid supply container that is airtightly formed surrounding the opening of the measuring container from a position lower than the upper surface of the opening. Introducing the liquid
When this liquid exceeds the upper surface of the measuring container opening, it flows into the measuring container from the opening, and when the liquid reaches the upper surface of the measuring container, or slightly later, the liquid is introduced into the liquid supply container. is stopped and the liquid in the liquid supply container is discharged by the liquid discharge means, so that there is no ripple of liquid in the liquid supply container, and the liquid is reliably filled to the top of the measuring container. Accurate metering is possible based on the capacity of the metering container, and compressed gas is supplied into the liquid supply container and the compressed gas is used to send out the liquid from the bottom of the metering container through the liquid delivery path. Since the liquid in the measuring container can be directly delivered without leaving any liquid in the liquid delivery path, the liquid can be supplied with extremely high precision.

In the example described above, the remaining amount of liquid is about 100 c.c. with 20 measuring chambers, and the remaining amount of liquid can be reduced to about 1/10 of the conventional one. In addition, the automatic metering liquid supply device of the present invention measures the liquid according to the capacity of the metering container, so even if a pump is used, there is no need to use a metering pump that has a complex configuration and is difficult to control. , in some cases, the liquid can be supplied to the liquid supply chamber by gravity flow without using a pump,
The structure is relatively simple, it is easy to make a corrosion-resistant structure, and it is easy to make it an explosion-proof structure, which improves safety.Since the liquid is delivered from the measuring container using compressed gas, the amount of liquid supplied is large. , reliable operation can be expected even when high discharge pressure is required.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural explanatory diagram showing one embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of the main part thereof. 1... Measuring container, 2... Liquid supply container, 3...
Liquid introduction means, 7...Liquid discharge means, 9...Compressed gas supply device, 11...Pipe line, 12...Liquid delivery path, SOiV1, SOiV2, SOiV3, SOiV6...
valve.

Claims (1)

[Claims] 1. A measuring container having an opening at the top, a liquid supply container that accommodates the opening of the measuring container inside and is formed airtight, and a container for introducing liquid into the measuring container through the liquid supply container. an open end of a liquid introduction conduit located inside the liquid supply container at a position lower than the upper surface of the opening of the measuring container;
A liquid discharge port formed at the bottom of the liquid supply container, a compressed gas supply device communicating with the liquid supply container, and a liquid delivery path having an open end located at the bottom of the metering container. Automatic quantitative liquid supply device.