Dispensing valve and its dispensing method

Abstract

The application provides a dispensing valve and a dispensing method thereof, the dispensing valve includes a base, a dispensing needle, a glue supply syringe, a connecting conduit with a through hole, a hose, a first air supply unit and a second Air supply unit. When the first air supply unit supplies air to the glue supply syringe, the liquid in the glue supply syringe is pressurized and flows into the hose; the second air supply unit supplies air to the connecting conduit through the through hole, when the pressure in the connecting conduit is greater than that of the hose When the internal pressure is high, the hose is deformed under pressure, and due to the continuous air supply of the first air supply unit, most of the liquid in the hose is discharged from the dispensing needle. The deformation of the hose is controlled by the pressure difference between the pressure in the glue supply syringe and the pressure in the connecting conduit, so that the dispensing amount can be effectively controlled, regardless of the liquid level in the glue supply syringe The influence of the pressure value to ensure uniform dispensing volume. When the hose expands to the initial position, the undischarged liquid in the dispensing needle can be sucked back into the hose, so as to avoid leakage.

Description

Technical field [0001] The present application belongs to the field of dispensing technology, more specifically, relates to a dispensing valve and the method of dispensing using the dispensing valve. Background [0002] At present, in order to reduce the mechanical rigid extrusion of the liquid, the pressure method is usually used to achieve dispensing, specifically through the gas supply equipment to supply gas to the syringe barrel, and the liquid in the syringe barrel is extruded into the dispensing needle by air pressure. [0003] However, the change in the height of the liquid level in the syringe barrel will change the air supply pressure of the gas supply equipment, the pressure of the end of the syringe to the dispensing needle, and the pressure when the dispensing needle is sucked back are affected by the height of the liquid level in the syringe, that is, there is a difference in the pressure at different positions in the syringe, resulting in the difficulty of controll...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present application is to provide a dispensing valve and its dispensing method to solve the problem in the related art: the pressure at each position in the syringe is affected by the height of the liquid level, which easily leads to the difficulty in controlling the dispensing amount. The problem of uneven dispensing volume

Images