Method for carrying out vacuum defoaming on high-viscosity liquid by utilizing pressure difference and aerodynamic force generated by gas contained in liquid

Abstract

The invention discloses a method for carrying out vacuum defoaming on high-viscosity liquid by utilizing pressure difference and aerodynamic force generated by gas contained in the liquid. A system is designed and comprises a hopper arranged outside a vacuum box and a defoaming container arranged in the vacuum box; the hopper is in closed connection with a feeding hole in one side of the top of a degassing container in the vacuum box and a small cutting chamber through a bottom control valve and a conveying pipe, the small chamber is communicated with a large defoaming chamber of the container through a sieve-shaped partition plate, and the large chamber is communicated with the vacuum box only through an extraction opening in the top of the other side of the container and an overflow opening in the middle of the side surface; and the overflow port is lower than the sieve-shaped partition plate. During working, the vacuum box is vacuumized, the valve is opened, the stock solution in the hopper flows through the small chamber and the large chamber under the action of pressure, and defoaming is completed under the action of aerodynamic force. An additional power device is not needed, and the whole device is simple and effective. The actual operation of defoaming the liquid with the viscosity of 50,000-120,000 cps proves that the method is effective.

Description

technical field [0001] The invention relates to a method for vacuum defoaming of high-viscosity liquid by utilizing the pressure difference and the pneumatic force generated by the gas contained in the liquid. Background technique [0002] After the liquid is stirred rapidly in the atmosphere, many air bubbles will be wrapped inside the liquid. When the viscosity is very low, the bubbles contained in the liquid in the container rely on their own buoyancy to float to the surface of the liquid. When the surface tension is not high, the bubbles burst, the gas diffuses to the environment, and the liquid sinks and gathers at the bottom of the container. So as to realize the automatic defoaming of the liquid. However, if the liquid has a high viscosity or a high surface tension, manual degassing is required. [0003] The simplest way is to adopt the vacuum static defoaming method, put the liquid containing gas in a container and put it into a vacuum box. After vacuuming, the int...

AI Technical Summary

Problems solved by technology

However, if the liquid is very viscous and the bubbles are very small, it is often used to manually cut the liquid under vacuum conditions or even add power mechanical agitation to defoam, so that the volume of the bubbles increases as much as possible to expose the liquid surface and prolong the rupture time. This needs to be done in a vacuum box. The power device is placed inside, which increases the complexity of the degassing device, and the degassing speed is also limited

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