Ventilating device and outdoor unit having the same

Abstract

A ventilating device and an outdoor unit including the same are disclosed. More particularly, the present invention relates to a ventilating device including a counter-rotating fan having improved wind ventilation efficiency as well as minimized noise generated during the fan operation.

1 . An outdoor unit comprising:
 a housing that includes an inlet and an outlet;   an outdoor heat exchanger provided in the housing;   a ventilating device in the housing between the inlet and the outlet, the ventilating device comprising:
 a first fan having a plurality of first blades arranged about a first shaft in a radial direction; 
 a second fan having a plurality of second blades arranged about a second shaft in the radial direction, wherein the first shaft of the first fan and the second shaft of the second fan are arranged on a same axis, and a shaft direction height of each first blade of the first fan is different from a shaft direction height of each second blade of the second fan; and 
 at least one motor configured to rotate the first fan in a first rotational direction and to rotate the second fan in a second rotational direction that is different than the first rotational direction. 
   
     
     
         2 . The outdoor unit of  claim 1 , wherein the first fan is provided between the outdoor heat exchanger and the second fan. 
     
     
         3 . The outdoor unit of  claim 2 , wherein the second fan to generate a pressure difference to make external air drawn via the inlet and the air is heat-exchanged by the outdoor heat exchanger, and the air is discharged via the outlet. 
     
     
         4 . The outdoor unit of  claim 1 , wherein the shaft direction height of each second blade of the second fan is 1 to 4 times more than the shaft direction height of each first blade of the first fan. 
     
     
         5 . The outdoor unit of  claim 1 , wherein each first blade of the first fan and each second blade of the second fan have a pitch angle within a range of 20 degrees to 30 degrees. 
     
     
         6 . The outdoor unit of  claim 1 , wherein each first blade of the first fan and each second blade of the second fan have a sweep angle within a range of 20 degrees to 60 degrees. 
     
     
         7 . The outdoor unit of  claim 1 , wherein the at least one motor includes:
 a first motor to drive the first fan; and   a second motor to drive the second fan.   
     
     
         8 . The outdoor unit of  claim 7 , wherein the first motor is arranged in a first direction and the second motor is arranged in a second direction that is opposite to the first direction. 
     
     
         9 . The outdoor unit of  claim 8 , wherein a rotational speed of the first motor is different than a rotational speed of the second motor. 
     
     
         10 . The outdoor unit of  claim 9 , wherein the rotational speed of the second motor is greater than the rotational speed of the first motor. 
     
     
         11 . The outdoor unit of  claim 10 , wherein the rotational speed of the second motor is 2 to 3 times more than the rotational speed of the first motor. 
     
     
         12 . The outdoor unit of  claim 1 , wherein each first blade of the first fan has a different directional shape than each second blade of the second fan. 
     
     
         13 . A ventilating device comprising:
 a first fan having a plurality of first blades arranged in a radial direction;   a second fan having a plurality of second blades arranged in the radial direction;   a first motor to drive the first fan; and   a second motor to drive the second fan,   wherein each first blade of the first fan has a different directional slope than each second blade of the second fan, and a shaft direction height of each second blade of the second fan is greater than a shaft direction height of each first blade of the first fan.   
     
     
         14 . The ventilating device of  claim 13 , wherein the shaft direction height of each second blade of the second fan is 1 to 4 times more than the height of each first blade of the first fan. 
     
     
         15 . The ventilating device of  claim 13 , wherein each first blade of the first fan and each second blade of the second fan have a pitch angle within a range of 20 degrees to 30 degrees. 
     
     
         16 . The ventilating device of  claim 13 , wherein each first blade of the first fan and each second blade of the second fan have a sweep angle within a range of 20 degrees to 60 degrees. 
     
     
         17 . The ventilating device of  claim 13 , wherein the first motor is arranged in a first direction and the second motor is arranged in a second direction, and a single motor mount is located therebetween. 
     
     
         18 . The ventilating device of  claim 17 , wherein a rotational speed of the second motor is greater than a rotational speed of the first motor. 
     
     
         19 . The ventilating device of  claim 18 , wherein the rotational speed of the second motor is 2 to 3 times more than the rotational speed of the first motor. 
     
     
         20 . The ventilating device of  claim 13 , wherein the first motor rotates the first blades of the first fan in a first rotational direction and the second fan rotates the second blades of the second fan in a second rotational direction that is opposite to the first rotational direction. 
     
     
         21 . An apparatus comprising:
 a housing having an inlet and an outlet;   a heat exchanger provided in the housing;   a ventilating device in the housing between the inlet and the outlet, the ventilating device comprising:
 a first fan having a plurality of first blades to rotate about a first shaft in a first rotational direction; 
 a second fan having a plurality of second blades to rotate about a second shaft in a second rotational axis, wherein the first shaft and the second shaft are arranged along a straight line, a height of one of the second blades of the second fan is greater than a height of each second blade of the second fan, and the first fan is provided between the heat exchanger and the second fan; and 
 a motor device to rotate the first blades of the first fan in the first rotational direction and to rotate the second blades of the second fan in the second rotational direction.