Volute fan combined structure and vertical air conditioner

The invention provides a volute fan combined structure which mainly solves the problem how to reduce influences of volutes of adjacent volute fans on air outflow in an air supply device provided with the adjacent volute fans. The structure comprises an installation plate and at least two adjacent volute fans installed on the installation plate. One of the two adjacent volute fans is provided with a middle air outlet located between the two adjacent volute fans, and compared with the other volute fan, the volute fan provided with the middle air outlet is located in front in the front-back direction perpendicular to the installation plate. The second volute fan, the first volute fan and the third volute fan are arranged on the installation plate in a staggered mode so that an air outlet of the second volute fan, the first volute fan and the second volute fan can be staggered, and interference is reduced. The invention further aims at providing a vertical air conditioner.