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Inside/outside air switching device with rotary door

  • US 20020000254A1
  • Filed: 06/26/2001
  • Published: 01/03/2002
  • Est. Priority Date: 06/29/2000
  • Status: Active Grant
First Claim
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1. An inside/outside air switching device comprising:

  • a case defining an air passage through which air flows, the case having a first port from which inside air inside a compartment is introduced, and a second port from which outside air outside the compartment is introduced; and

    a rotary door disposed in the case, for selectively opening and closing the first port and the second port, wherein;

    the rotary door includes a rotation shaft disposed rotatably, a circumference wall provided at an upper side of the rotation shaft to extend in a rotation direction, both fan-like side plates connecting the circumference wall and the rotation shaft at both sides in an axial direction of the rotation shaft, a protrusion wall provided along an entire periphery of the circumference wall and the side plates to protrude toward an outside of the rotary door, and a packing member made of an elastic member, and provided at both surface sides of the protrusion wall;

    the case has seal surfaces provided around both the first and second ports to contact the packing member;

    at least one of both the first and second ports has a circumference opening provided to opposite to the circumference wall; and

    the rotary door is disposed in the case to form a clearance between the protrusion wall around a lower side of the rotation shaft and the seal surface, the clearance having a size equal to or larger than a predetermined dimension.

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