Air passage switching system for air conditioner

摘要

An air passage switching system includes a case forming an air passage having an opening portion, and a butterfly door for opening and closing the opening. The door includes a door body portion made of a material having a high rigidity, and a seal member attached to the door body. The seal member is made of an elastic material, and is formed into a thin-plate shape to extend from an outer peripheral portion of the door body portion toward an outer side. The seal member of the door is press-fitted to a case seal surface around the opening portion along a seal line (D), so that the opening portion is closed. The door is set in such a manner that an inner peripheral curvature radius (RC2) of a corner portion of the case seal surface on the seal line is larger than an outer peripheral curvature radius (RD) of the seal member on the corner portion. Thus, the air passage switching system prevents air leak due to a deformation of the seal member while being produced in low cost.