Dual-layer flow blower unit for vehicle air-conditioner

A dual-layer flow blower unit for a vehicle air-conditioner, comprising:

• a pair of an upper blower case and a lower blower case which are vertically partitioned by a partition plate, and has a scroll shape formed to introduce air from an air inlet formed on an upper part and formed to blow air into a pair of an upper blower duct and a lower blower duct formed in a lateral direction, respectively;
• an intake box which is coupled to the upper part of the upper blower case and selectively opens and closes the air inlet;
• a drainage case which is coupled to a lower part of the lower blower case and has a drainage duct formed so as to incline downward along a longitudinal direction of the lower blower duct;
• a motor case which is coupled to a lower part of the drainage case;
• a blower fan which is installed inside the upper blower case and the lower blower case, introduces an inside air and/or an outside air, and blows air toward each of the upper blower duct and the lower blower duct;
• a blower motor which is installed inside the motor case and rotates the blower fan;
• and
• a blower motor cooling unit which cools the blower motor by a cooling air, which is a part of air flowing the lower blower duct, is branched from the lower blower duct, is supplied to and passed through an inside of a cooling chamber, and is circulated inside the motor case, wherein
• the cooling chamber of the blower motor cooling unit includes:
• a chamber upper plate which is extended and formed on one side of the upper blower duct connected from the upper blower case;
• an upper chamber which is opened at a top part and a bottom part so as to be extended and formed on one side of the lower blower duct connected from the lower blower case, an open top part being sealed by the chamber upper plate, and has a cooling inflow hole formed in a penetrating manner to branch and introduce a part of air flowing the lower blower duct;
• and
• a lower chamber which is opened at a top part so as to be extended and formed on one side of the drainage duct connected from the drainage case, an open top part being coupled to communicate with the bottom part of the upper chamber, and is communicated with an inside of the motor case through a cooling tube, the cooling tube being formed to extend vertically in the lower chamber, to penetrate a bottom wall of the lower chamber, and wherein
• the lower chamber further includes
• an open side to the drainage duct which discharges water stored above the bottom of the lower chamber to the drainage duct, and wherein
• the cooling tube of the lower chamber is formed so that a height of an upper end of the cooling tube is formed higher than a height of an upper end of the lower chamber, and wherein
• the upper chamber further includes:
• a second bottom blocking plate which is formed to seal a bottom of the upper chamber, and is formed to have a second cooling tube insertion hole through which an upper end of the cooling tube is inserted in a penetrating manner;
• and
• a third drainage passage which is located on the second bottom blocking plate so as to discharge water stored above the second bottom blocking plate.