According to the condition of the cover plate, the common wet shotcrete machine impeller can be divided into three types: closed type, open type and semi-open type.
1. Closed impeller
The closed impeller of the wet shotcrete machine consists of the blade and the front and rear cover plates. The closed impeller has high efficiency and is difficult to manufacture. It is widely used in centrifugal pumps and is suitable for particles with low wet spray viscosity and cleaning liquid.
2, Open impeller
The open type impeller of the wet shotcrete machine has no cover on both sides of the blade, which is simple to manufacture and convenient to clean. The impeller has low working efficiency and the pressure of the wet spray liquid is not high, and is suitable for wet spraying materials containing a large amount of suspended matter.
The wet shotcrete machine semi-open impeller is an impeller with only the rear cover and no front cover. Generally, when the wet spray contains suspended matter, in order to avoid clogging, an open or semi-open impeller is sometimes used. There are few leaves, usually only 2-5 pieces.
