Stacked fan structure, combined blade-integrated fan and automotive seat ventilation system

A combined blade-integrated fan with bidirectional asymmetric impellers, configured for a ventilation system of an automotive seat, comprising:

• a housing assembly, wherein the housing assembly defines a first space and a second space in communication with each other in an interior of the housing assembly, a first air exchange opening and a second air exchange opening are provided on the housing assembly, the first space is in communication with the first air exchange opening, and the second space is in communication with the second air exchange opening;
• and
• a first blade fan assembly and a second blade fan assembly, wherein the first blade fan assembly is mounted in the first space, the second blade fan assembly is mounted in the second space, and the first blade fan assembly and the second blade fan assembly operate independently from each other;
• in response to the first blade fan assembly actively operating, air flows from a side of the automotive seat near an occupant, through the second air exchange opening, the second space, the first space, and the first air exchange opening, to a side of the automotive seat away from the occupant;
• in response to the second blade fan assembly actively operating, air flows from the side of the automotive seat away from the occupant, through the first air exchange opening, the first space, the second space, and the second air exchange opening, to the side of the automotive seat near the occupant;
• wherein the first blade fan assembly comprises a first impeller, the second blade fan assembly comprises a second impeller;
• the first impeller and the second impeller have different thicknesses along a direction in which rotating shafts of the first impeller and the second impeller extend.