JPS6168614A - Liquid spouting device - Google Patents

Abstract

PURPOSE:To attain quantitative discharge with high precision by controlling the time of pressure application to the surface in the liquid in a cylinder on the basis of measurement data on the temperature of the in-use liquid obtained by a temperature sensor. CONSTITUTION:Compressed air from an air source 1 after being held constant through a main regulator 2 and a discharge governor valve 3 is applied to the surface of the liquid 9 in the cylinder 8 for a specific time through a solenoid valve 6 operated with a signal from a time controller 15 and the liquid 9 is discharged from a lower thin discharge pipe 10. The temperature sensor 11 for the liquid temperature in the cylinder 8, a temperature measuring circuit 21, a data processing circuit 22, and a solenoid valve controller 20 are provided to calculate the time of pressure application necessary for quantitative discharge on the basis of temperature characteristic data on the discharge performance to the solenoid valve 6, thereby controlling the conducting time (pressure application time) to the solenoid valve. For example, when the liquid temperature varies from T1 to T2, the conducting time of the solenoid valve 6 during liquid discharge is varied from t1-t2.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a pressurized liquid ejecting device that pressurizes the surface of liquid filled inside a cylinder to push out the filled liquid from the other small diameter thin tube.

<Prior art> The viscosity of a liquid changes when its temperature changes. Therefore, in a pressurized liquid dispensing device, even if the liquid is discharged with a constant pressurizing force for a fixed pressurizing time, the operating ambient temperature will change (
(the viscosity of the liquid changes), the amount of liquid discharged changes.

In conventional liquid dispensing equipment, in order to eliminate the effect of changes in the ambient temperature on the dispensing amount, the temperature of the used liquid is maintained at a constant temperature to eliminate changes in the viscosity of the liquid.
A fixed amount of liquid is being discharged.

FIG. 3 shows an example of a conventional device.

The method for discharging liquid is that pressurized air from an air source I, which is kept at a constant pressure by the main regulator 2 and discharge pressure regulating valve 3, passes through the solenoid valve 6 operated by a signal from the time controller 15, and discharges the liquid in the cylinder 8. The liquid level of the liquid 9 is pressurized for a certain period of time, and the entire liquid is discharged from the lower discharge capillary IO. After being kept at a constant pressure by the pressure regulating valve 5 and heated by the air heater 12, it is blown onto the cylinder 8 covered with the constant temperature jacket 7. Also, the temperature sensor for liquid 9! 1, and the temperature controller 14 detects the air heater 12.
By fully controlling the electric power applied to the cylinder 8, the temperature of the pressurized air blown into the cylinder 8 is changed, and the temperature of the liquid 9 is kept constant. In addition, 4,4. ... is a pressure gauge.

However, the above liquid ejecting device has the following problems.

[11] Depending on the liquid used, if the liquid temperature changes by 1° C., the discharge amount may change by about 10%, and highly accurate temperature control is required to discharge a fixed amount.

(2) In order to perform stable quantitative discharge, the discharge capillary 1
0 from the temperature control jacket 7 must be made as small as possible. Therefore, since the shape of the discharging tip becomes large, it is difficult to apply the entire liquid to a position with a complicated shape.

Purpose of the Invention The present invention has been made in view of the above problems, and
To provide an entire discharge device that does not require a temperature control jacket and does not affect the discharge amount even if the ambient temperature changes. In other words, in a pressurized liquid dispensing device, highly accurate fixed-quantity dispensing is possible by fully controlling the pressurizing time of the liquid surface inside the syringe based on the data measured by the temperature sensor of the liquid temperature used or the ambient temperature used. The purpose of the present invention is to provide a complete liquid ejection device.

<Embodiment> FIG. 1 shows an embodiment of the dispensing device according to the present invention. The temperature of the liquid 9 in the cylinder 8 is detected by the temperature sensor 11 and the temperature measuring circuit 21,
Based on the temperature characteristic data of the discharge performance of the liquid 9 that has been input into By fully controlling the pressurization time), highly accurate liquid discharge can be performed. Note that the air that pressurizes the liquid surface inside the cylinder 8 is supplied to the main regulator 2 and the discharge pressure regulating valve 3.
The pressure is kept constant.

As the temperature characteristic data for liquid discharge, as shown in FIG. 2, the liquid temperature and the electromagnetic valve energization time (pressurization time) t required for constant discharge are used. For example, as shown in Figure 2, the liquid temperature changes from T2 to T2 due to a change in the operating ambient temperature.
When the current flow time of the electromagnetic valve 6 when discharging the liquid changes from 2t (time for pressurizing the liquid surface) to t2, a fixed amount can be discharged.

Effects> As described above, the present invention has the following effects compared to the conventional ones.

(1) It has become possible to dispense a fixed amount of liquid without using a temperature control jacket.According to experiments, even if the ambient temperature in which it is used changes by ±5 degrees Celsius, the amount of discharge varies with the fixed quantity dispensing device of the present invention. However, if the liquid pressurization time is not fully controlled as in the present invention, if the liquid temperature changes by ±5%, the discharge amount will change by approximately ±50%. (2) Since the temperature control jacket is not used at all, the shape of the dispensing tip is the same as that of a hypodermic needle, making it easier to apply liquid to positions with complex shapes.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing all examples of temperature characteristic data of liquid discharge, and FIG. 3 is a block diagram showing a conventional example. 1...Air source, 2...Main regulator, 3.
...Discharge pressure regulating valve, 6...Solenoid valve, 8...Cylinder, 9...Liquid, 10...Discharge capillary, ■Temperature sensor, 20...Solenoid valve controller, 21... -Temperature measurement circuit, 22...data processing circuit.

Claims (1)

[Claims] 1. In a pressurized liquid discharge device that pressurizes the surface of the liquid filled inside the cylinder to push out the filled liquid from the other small diameter thin tube, the liquid filled inside the cylinder is pressed. 1. A pressurized liquid discharging device, characterized in that the liquid is discharged in a fixed amount by controlling the pressurizing time of the liquid surface based on a detected value of temperature or ambient temperature. 2. Claim 1, characterized in that it has a control system that can determine the pressurization time with pressurized gas based on the temperature of the liquid or the relationship between the ambient temperature in use and the amount of liquid discharged.
This is a pressurized liquid discharge device.