Venturi tube 
 In the environmental industry, also known as the Venturi tube Venturi tube, is a special device based on perfect powder filter powder in the air guide, installation such venturi airflow through the lateral area of ??the bottleneck population decreases, the flow rate to speed up and quickly along the downward movement of the filter upper part. 
 Its main role is the induction of secondary airflow, shoot suction effect, the airflow from coarse to fine, in order to speed up the gas flow rate, the gas to form a "vacuum" area in the rear of the venturi tube exports, in order to achieve the delivery of powder, injection of the gas source from the ejector, to help them maintain water and electrolyte balance, to enhance the cleaning effect. 
 Venturi tube material is mainly determined according to the application places the most commonly used materials are cast iron, aluminum, steel, and so on. Three air dust collector filter bag cleaning in high-speed airflow through the venturi tube induced by five to eight times in blowing compressed air into the dust collector bag, causing the dust collector bag instant rapid expansion of airflow anti- accumulates to the role attached to the dust collector bag on the dust off. 
 The venturi greatly increased the pulse jet strength and effect, reducing the amount of compressed air, saving energy, is widely used in vacuum cleaners, powder conveying, coolers, flow meters, dryers, etc..