Inside air/outside air switching device

Abstract

An inside air/outside air switching device that includes: an inside air/outside air switching case that has an outside air inlet which opens into an engine room, a first inside air inlet and a second inside air inlet which open into a vehicle compartment; an inside air/outside air switching door that is provided in the inside air/outside air switching case, and that switches an open inlet between the first inside air inlet and the outside air inlet; an inside air introduction support door that opens and closes the second inside air inlet; and a noise insulation member that is provided in such a manner that an operation of the inside air introduction support door is not interfered with, and that blocks out noise which is generated in the engine room and which proceeds from the outside air inlet toward the second inside air inlet when the outside air inlet is open.

1 . An inside air/outside air switching device, comprising:
 an inside air/outside air switching case that has an outside air inlet which opens into an engine room, a first inside air inlet which opens into a vehicle compartment, and a second inside air inlet which opens into the vehicle compartment and which is formed in a side wall of the inside air/outside air switching case;   an inside air/outside air switching door that is provided in the inside air/outside air switching case, and that switches an open inlet between the first inside air inlet and the outside air inlet;   an inside air introduction support door that opens and closes the second inside air inlet; and   a noise insulation member that is provided in such a manner that the noise insulation member does not interfere with an operation of the inside air introduction support door, and that blocks out noise which is generated in the engine room and which proceeds from the outside air inlet toward the second inside air inlet when the outside air inlet is open.   
   
   
       2 . The inside air/outside air switching device according to  claim 1 , further comprising
 an air blasting unit that is provided at a position which is downstream of the inside air introduction support door in a direction of air flow, and that takes in air introduced into the inside air/outside air switching case through the inlets, wherein:   the inside air introduction support door is provided at a position that is downstream of the inside air/outside air switching door in the direction of air flow and that is on an inner side of the second inside air inlet, moves inward from an inner wall face of the inside air/outside air switching case when the inside air introduction support door opens the second inside air inlet, and opens and closes the second inside air inlet based on a change in a pressure in the inside air/outside air switching case when the outside air inlet is open; and   the noise insulation member is provided at a position outside but near an operation range of the inside air introduction support door.   
   
   
       3 . The inside air/outside air switching device according to  claim 2 , wherein:
 the pressure in the inside air/outside air switching case when the outside air inlet is open is determined based on a pressure of outside air that is introduced into the inside air/outside air switching case through the outside air inlet and an intake negative pressure that is generated when the air blasting unit is driven;   when the pressure in the inside air/outside air switching case is lower than a pressure of inside air, the inside air introduction support door is drawn inward from the inner wall face to open the second inside air inlet; and   when the pressure in the inside air/outside air switching case is higher than the pressure of the inside air, the inside air introduction support door is pushed against the inner wall face of the inside air/outside air switching case to close the second inside air inlet.   
   
   
       4 . The inside air/outside air switching device according to  claim 2 , wherein:
 the noise insulation member is provided in such a manner that the noise insulation member covers the inside air introduction support door;   a space, through which the air that is introduced into the inside air/outside air switching case through the second inside air inlet flows, is left between a downstream-side end of the noise insulation member and an upper plate of the air blasting unit; and   an end of the noise insulation member, which is on an opposite side of the downstream-side end, contacts the inner wall face of the inside air/outside air switching case.   
   
   
       5 . The inside air/outside air switching device according to  claim 4 , wherein:
 the noise insulation member is formed of two side portions, and has a substantially L-shaped cross section; and   an inside face of an end of one of the side portions, which is the end on the opposite side of the downstream-side end of the noise insulation member, contacts an upper end of the inside air introduction support door.   
   
   
       6 . The inside air/outside air switching device according to  claim 5 , wherein:
 side plates are provided at respective longitudinal ends of the noise insulation member; and   each of the side plates connects one of the side portions to the other side portion.   
   
   
       7 . The inside air/outside air switching device according to  claim 2 , further comprising
 an air filter that is provided between the inside air introduction support door and the air blasting unit, and that filters the air introduced into the inside air/outside air switching case through the inlets, wherein:   the noise insulation member is provided in such a manner that the noise insulation member covers the inside air introduction support door;   a small space is left between a downstream-side end of the noise insulation member and the air filter;   an end of the noise insulation member, which is on an opposite side of the downstream-side end, contacts the inner wall face of the inside air/outside air switching case; and   a small space is left between each of both longitudinal ends of the noise insulation member and the inner wall face of the inside air/outside air switching case.   
   
   
       8 . The inside air/outside air switching device according to  claim 7 , wherein:
 the noise insulation member is formed of two side portions, and has a substantially L-shaped cross section; and   an inside face of an end of one of the side portions, which is the end on the opposite side of the downstream-side end of the noise insulation member, contacts an upper end of the inside air introduction support door.   
   
   
       9 . The inside air/outside air switching device according to  claim 8 , wherein:
 side plates are formed at respective longitudinal ends of the noise insulation member; and   each of the side plates connects one of the side portions to the other side portion.   
   
   
       10 . The inside air/outside air switching device according to  claim 2 , further comprising
 an air volume adjustment plate that is provided at a position which is downstream of the inside air introduction support door in the direction of air flow, and that has a draft resistance which is substantially equal to a draft resistance of an air filter that filters the air introduced into the inside air/outside air switching case through the inlets, wherein:   the noise insulation member is provided in such a manner that the noise insulation member covers the inside air introduction support door;   a small space is left between a downstream-side end of the noise insulation member and the air volume adjustment plate;   an end of the noise insulation member, which is on an opposite side of the downstream-side end, contacts the inner wall face of the inside air/outside air switching case; and   a small space is left between each of both longitudinal ends of the noise insulation member and the inner wall face of the inside air/outside air switching case.   
   
   
       11 . The inside air/outside air switching device according to  claim 10 , wherein:
 the noise insulation member is formed of two side portions, and has a substantially L-shaped cross section; and   an inside face of an end of one of the side portions, which is the end on the opposite side of the downstream-side end of the noise insulation member, contacts an upper end of the inside air introduction support door.   
   
   
       12 . The inside-air/outside air switching device according to  claim 11 , wherein:
 side plates are formed at respective longitudinal ends of the noise insulation member; and   each of the side plates connects one of the side portions to the other side portion.   
   
   
       13 . The inside air/outside air switching device according to  claim 1 , further comprising:
 a servo motor that opens and closes the inside air introduction support door.