YWV vacuum fan is a volumetric fan, whose negative pressure can be adjusted within the permissible range according to the requirements of the users. Two sets of impellers are set up inside the casing to rotate in the opposite direction to each other, and they rotate in the state of leaving only a very small gap between the impellers and impellers, and between the impellers and the casing. When the impeller passes through the suction end, a certain amount of air is captured between the impeller and the casing, and with the rotation of the impeller, the air is shifted sideways and discharged from the outlet end. In the process of operation, the negative pressure of the pipeline at the suction end will slowly increase until the required value.Translated with DeepL.com (free version)