Efficient vacuum degasser

Abstract

The invention discloses an efficient vacuum degasser. Particularly, centrifugation is utilized for cooperating with a hole / seam structure to separate bubbles in coating, and the bubbles are broken under the action of vacuum and mechanical collisions. The degassing process particularly comprises the steps that the coating entering a rotating drum is subjected to centrifugal separation by a certain distance, and layering of the coating and the bubbles is achieved; the coating is continuously raised along the rotating drum wall, the coating and the bubbles are separated under the centrifugation through holes or seams in the rotating drum wall or a combination of the holes and the seams, and the separated coating is thrown to the inner wall of a vacuum tank; or the coating enters a next layer of the multi-layer rotating drum, layering and separating of the coating and the bubbles are completed, and the coating is thrown to the inner wall of the vacuum tank finally; the bubbles are broken under the impact action, and separation and removal of the bubbles are achieved. The efficient vacuum degasser is good in degassing effect, the gas content of the coating is smaller than 0.5% after degassing is conducted, and the requirement of low gas content in various production processes is met.

Description

technical field [0001] The invention relates to a degasser, in particular to a high-efficiency vacuum degasser. Background technique [0002] The problem of "bubble interference" is common in the industrial production process of biochemistry, food, chemical industry, etc., such as reducing the production efficiency of equipment, interfering with the control measurement system, making the components mixed unevenly, affecting the appearance of the product, polluting the environment, etc., which have a great impact on the production process and Product quality is affected. Some production processes allow certain air bubbles, while some production processes have very strict requirements on air bubbles, almost not allowing any air bubbles, which puts forward higher requirements on the degassing efficiency of the degassing device. [0003] In the paper industry, air bubbles can affect processes such as pulping, papermaking and coating. Compared with the pulping and papermaking p...

AI Technical Summary

Problems solved by technology

For example, in the patent "a vacuum degassing device for paint" (application number CN 201420650553.7), the air bubbles in the paint are separated by the principle of centrifugal separation; The baffle is composed of; when degassing, the vacuum storage barrel is evacuated by a vacuum pump, so that a negative pressure is formed in the barrel. When the paint with air bubbles enters the barrel, the mesh-type rotating material plate rotates at a high speed. Due to the high specific gravity of the paint , out of the net-type rotating material tray into the lower part of the storage barrel, the upper air bubbles are broken by the negative pressure in the storage barrel and brought into the vacuum pump pipeline to pump away, so as to achieve the purpose of eliminating the air bubbles in the paint; this method uses high-speed rotating net-type rotation The material tray separates the paint and the air bubbles, but this method is only suitable for low-viscosity paints. For high-viscosity paints, due to the relatively low moving speed of the air bubbles in the paint, it is difficult to separate the paint from the air bubbles. It is difficult to be broken, so it is difficult to receive a good degassing effect

In the patent "on-line degasser for paint" (application number CN 200720091817.X), centrifugal collision is used to break the air bubbles in the paint; The bottom surface of the tank is mesh-shaped; when degassing, under vacuum conditions, the paint enters the high-speed rotating degassing tank, is thrown out, and hits the baffle in the degassing tank. After the bubbles are broken, the air is sucked away by the vacuum pump. The paint flows down to the discharge pipe of the tank under the action of gravity; this method uses the principle of vacuum and mechanical collision to destroy the bubbles, but does not separate the paint from the bubbles. For low-viscosity paints, the bubbles are easy to burst, even if the package In coatings, vacuum and mechanical impact alone are enough to break them, but for high-viscosity coatings, if the air bubbles are wrapped in the coating, they cannot be effectively separated and it is difficult to break them

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