JPS63100970A - Method and dispenser for precisely emitting very small amount of liquid - Google Patents

Abstract

PURPOSE:To shorten the liquid emitting time of a dispenser by excluding the operation resistance of an armature, by operating the armature, which operates the solenoid valve in the dispenser, in gas. CONSTITUTION:A liquid L is received in the lower part of the liquid emitting chamber 1.R within a liquid emitting dispenser according to a level gauge. The pressure P of compressed air CA is always steadily applied to the surface of the liquid and the liquid is emitted by the opening operation of the valve 2 provided to the bottom part of the liquid emitting chamber 1R. This operation of the valve 2 is performed by the armature 4 provided in the compressed air in the upper part of the liquid emitting chamber 1R and the solenoid coil 10 mounted outside said armature 4. In this case, since the armature 4 is present in the compressed air and the resistance to the up-and-down operation thereof is not generated at all, the armature 4 can be operated at valve opening and closing sensitivity of a msec unit of one figure.

Description

[Detailed description of the invention] Often used.

÷ Here are some examples of conventional dispenser structures in use. Please refer to Figure 3. This is a general liquid discharge gun. First, the pressurized liquid enters the liquid discharge chamber 21R in the gun. Since the valve 22 in the same chamber is closed, liquid is stored in the same chamber. Next, since the stem 23 of the valve extends upward and is connected to the air piston chamber 24R, the operating air O is supplied to the piston 26 in the chamber.
When A enters, the piston operates and the valve 22
opens and discharges the pressurized liquid to the outside. There is a problem with this N. As mentioned above, since a dispenser discharges a small amount of liquid, the discharge time must be extremely short. Or, pressurize the liquid at a low pressure. That short time is measured in milliseconds, and sometimes single digits are required. However, the above-mentioned conventional dispensers could not meet such demands. The reason for this is that the valve's operation was mirror-type. As can be seen in the figure, a tight backing 45 is provided on the outside of the valve stem 43 to isolate the lower liquid discharge chamber 21R from the upper air piston chamber 24R. Because of this frictional resistance, the speed of the vertical movement of the valve stem 23 is suppressed. Furthermore, as shown in FIG. 4, the operating air OA for the piston is sent from the solenoid valve 28 located a certain distance S'' away from the dispenser 21, so there is a time lag between them. The discharge time was about 50 milliseconds at the shortest.

The newest dispensers are used to eliminate the above-mentioned time lag and the frictional resistance of the backing on the valve stem. It is a direct acting type of solenoid valve, as seen in Figure 5. To explain the figure, a solenoid operating section is provided above the dispenser body 41. That is, an armature 44 is provided at the upper end of a valve stem 43 that runs vertically within the same body. Since the inside of the body serves as a liquid discharge chamber, it is filled with liquid, and the armature connected to the chamber is also immersed in the liquid. The upper part of the armature is covered by a sealed envelope 45. The armature operates when the solenoid coil 48 is excited by an external electric signal to open and close the valve. With this dispenser, the dispensing time could be shortened to about 20 milliseconds.

However, as a practical matter, it is shorter than that, for example, 5
Around milliseconds is required.

The motive of the present invention was to obtain a dispenser for dispensing minute amounts of precision liquid with a dispensing time of approximately 5 milliseconds.

Problems to be Solved A problem with the valve operation of the solenoid direct operated dispenser/suction is that when the armature 44 moves up and down, the armature exerts force on the immersed liquid wood. The fluid resistance in that case is relatively large.

This slows down the opening/closing operation of the valve.

In this 5, if the above-mentioned acture is operated in a gas, it is possible to eliminate the trouble in the above-mentioned valve operation.

It is an object of the present invention to eliminate the resistance of the actuation of the solenoid valve in the dispenser by immersing the armature in the gas, and thus to immediately respond to an electrical signal to the solenoid valve to time the liquid discharge time of the dispenser. The aim is to shorten the time.

Means to Solve the Problem By making the liquid discharge chamber in the dispenser larger than the conventional one, filling only the lower part with liquid, filling the upper part with pressurized electricity, and further providing an armature above it, the amateur can be removed. It is to release it from the liquid.

The gist of the present invention is to first feed a liquid into the liquid discharge chamber 1R in a liquid discharge dispenser to fill the middle of the chamber, then to feed gas under pressure, and to pressurize the liquid surface with the pressurized gas. The opening and closing of the discharge is operated by a solenoid installed above the liquid discharge chamber, and the structure of the dispenser includes a valve stem 3 that vertically penetrates into the liquid discharge chamber. established,
A liquid discharge valve 2 is attached to its lower end, and a solenoid armature 4 is attached to its upper end, and the lower part of the liquid discharge chamber 1R is used as a liquid storage part, and the upper part is used as a pressurized gas part. .

The method of the present invention will be explained. Please refer to FIG. This figure shows the basic structure of the present invention.

First, pour a small amount of liquid into the lower part of the liquid discharge chamber 1R in the liquid discharge dispenser according to the level gauge.
The amount of time required is about 200cc to 300cc, and it is enough to add it once before starting work. Tazoshi, more or 2
In the case of continuous operation for 4 hours, liquid is replenished by being pumped at a pressure higher than that of pressurized gas. However, care must be taken to ensure that the above liquid does not exceed a certain level. That is, the pressure of the pressurized gas CA is constantly applied to the surface of the liquid.

This pressure causes the liquid in the liquid discharge chamber to be discharged, but
It is 11 of valve 2 installed at the bottom of the liquid discharge chamber.
Asked by Kai 1. The valve is operated by an armature 4 provided above the upper pressurized gas chamber 1R of the liquid outlet chamber and a solenoid coil 10 mounted outside the armature. That is, since the armature 4 is in the pressurized gas and not immersed in liquid as in the conventional case, there is no resistance to the armature's vertical movement, and the valve opening/closing sensitivity can be operated in milliseconds. .

Next, the structure of the dispenser according to the present invention will be explained. Please also refer to FIG.

The dispenser main body is a liquid discharge chamber 1R. A valve stem 3 is provided extending vertically through the liquid discharge chamber, a valve 2 is attached to the lower end of the valve stem, and an armature 4 is attached to the upper end of the valve stem oriented coaxially. For the above valve, the valve seat 7 and the discharge hole 8
, a nozzle 9 connected thereto is attached, and the entire outer periphery of the armature 4 is surrounded by a covering cylinder 5, and a pipe ring 6 is provided within the cylinder between it and the armature.

Action Please refer to Figure 1. First, a required amount of liquid is placed in the liquid discharge chamber 1R in the dispenser.

This is done manually or by applying pressure from the liquid supply port 15 while checking the level meter 14. Thereafter, the air vent plug 16 is tightened, and pressurized air CA at a certain pressure P is sent through the air supply port 12. That is, a pressure P is applied to the liquid reservoir. Since the valve 2 in the liquid discharge chamber 1R is always "closed", the liquid is retained within the same chamber. Next, when the solenoid coil 10 is energized by an electric signal from the outside, the armature 4 moves upward, the valve 2 directly connected to it opens, and the pressurized liquid in the chamber is discharged from the discharge hole and the nozzle hole 8. is discharged to the outside through the The time for energizing the solenoid coil is in milliseconds, and the valve is closed after the same time. In the opening/closing operation section of the valve, since the valve stem 3 and the armature 4 have no resistance section at all, there is almost no time delay in the opening/closing operation. Therefore, since the valve opens and closes faithfully and precisely according to the timer, a small amount of liquid can be discharged by opening the valve for a short period of time.

Embodiment This embodiment is a fifth embodiment of the basic structure of the dispenser according to the present invention described above. Figure 2 shows a connection system diagram of peripheral equipment for the dispenser. That is, before operation, liquid is manually injected into the dispenser 1 through the funnel 19 tube.

When replenishing liquid during operation, the liquid may be pumped by applying a pressure higher than the air pressure applied to the dispenser using the pump 20.

The pressurized air CA is supplied by a near compressor 16 or the like through a regulator 17, and is energized through a timer 18 through a lenoid coil 10.

Effects of the Invention According to the method of the present invention and its dispenser, it is possible to discharge a small amount of liquid in a short time of milliseconds in opening and closing operations of a valve in milliseconds. As a result of experiments, the valve opening time of the conventional valve was limited to 20 milliseconds, whereas the limit was 0.0 milliseconds.
It became possible to shorten the time by 5 milliseconds.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of the basic structure of the dispenser according to the present invention. Figure 2 is a connection diagram of the same dispenser and peripheral equipment. Figure 3 is a side sectional view of a conventional dispenser. Connection diagram Figure 5 is a side sectional view of a conventional solenoid direct-acting dispenser and an explanation of the main symbols.

Claims (1)

[Claims] 1. In a dispensing method in a vertical downward liquid dispensing dispenser, a liquid L is put into the lower part of the liquid dispensing chamber 1R, and the liquid surface LF is pressurized by pressurized gas CA;
Furthermore, the liquid is intermittently discharged by the operation of the on-off valve 2 provided at the bottom of the liquid discharge chamber 1R and the on-off valve operation parts 4 and 10 provided at the upper part of the liquid discharge chamber. A method for dispensing minute amounts of precision liquid. 2. In the vertical downward liquid discharge dispenser, a. The lower part of the liquid discharge chamber 1R inside the main body 1 is used as a liquid storage part, and the upper part is used as a pressurized gas part, and b. The inside of the liquid discharge chamber 1R is A valve stem 3 is designed to penetrate vertically through the valve stem, and the lower end of the valve stem is provided with a valve 2 for opening and closing liquid discharge, and the upper end thereof is provided with a solenoid armature 4, c. There is a pressurized gas supply port 1 on the top of 1R.
2. d. A sealed envelope 5 is provided on the outer periphery of the armature 4, and a solenoid coil 10 is provided on the outside of the cylinder. Dispenser for dispensing. 3. Claim 1, characterized in that a liquid supply port 15 and an air vent plug 16 are provided in the liquid discharge chamber 1R.
Dispenser for dispensing minute amounts of precision liquid as described in section.