The purpose is to solve the problem that the volute tongue of the existing centrifugal fan will produce noise when intercepting the flow to change the air flow direction .

Therefore, the utility model provides a shell of a centrifugal fan, a centrifugal fan and a clothes dryer. The shell comprises a volute tongue, the windward part of the volute tongue is obliquely arranged, and the windward area of the windward part gradually or step by step increases from the weak windward end of the windward part to the strong windward end of the windward part By inclining the windward part of the cochlear tongue, the air flow at the bottom of the cochlear tongue is cut by the cochlear tongue first, and the air flow at the top of the cochlear tongue is then cut by the cochlear tongue, so as to avoid the cochlear tongue cutting the air flow at one time. The generation of noise can be effectively reduced through stratified cutting of the air flow, and the windward area of the windward part gradually or step by step increases from the weak windward end to the strong windward end, The air flow at the bottom of the shell is small, and the windward area of the windward part is small, which is conducive to closure. The air flow at the top of the shell is large, and the windward area of the windward part is large, which is conducive to reducing noise.