Blower and heatpump using the same

Abstract

A now-noise blower is provided which reduces the turbulence of incoming air flow itself even if there is un-uniformity resulting from circumferential positions around a rotation shaft of air inlet passage. Such a blower includes a blade 1 having its outer circumferential edge 1 c warped in a rotational direction and a bellmouth 5 covering the circumference of the blade at the air outlet side, wherein a surface of the bellmouth facing the blade has a convex-shaped first upstream expanding portion 5 c upstream extending from a minimum inner diameter portion Pb 3 and a concave-shaped second upstream expanding portion 5 d further upstream extending, the second upstream expanding portion being continuous from the first upstream expanding portion.

1 . A blower comprising:
 a blade having an outer circumferential edge having a recessed warp in a rotational direction, and   an annular bellmouth covering the circumference of the blade at an air outlet side,   wherein a portion of the bellmouth facing a face composed of a rotational trajectory of the outer circumferential edge has a first upstream expanding portion formed in a shape of a convex, facing an upstream direction of a rotation shaft and extending upstream from a minimum inner diameter position and a second upstream expanding portion formed in a shape of a concave, facing the upstream direction of the rotation shaft, being continuous with and extending upstream from the first upstream expanding portion.   
     
     
         2 . The blower of  claim 1 , wherein an upstream portion of the second upstream expanding portion is formed generally in a shape of a cone. 
     
     
         3 . The blower of  claim 1 , wherein a transition between the first upstream expanding portion and the second upstream expanding portion is located downstream of a maximum warpage position on the outer circumferential edge of the blade. 
     
     
         4 . The blower of  claim 1 , wherein a third upstream expanding portion is formed in a shape of a convex in the upstream direction of the rotation shaft, the third upstream expanding portion being continuous with and extending upstream from the second upstream expanding portion. 
     
     
         5 . The blower of  claim 4 , wherein the second upstream expanding portion or the third upstream expanding portion covers the maximum warpage portion on the outer circumferential edge of the blade. 
     
     
         6 . The blower of  claim 1 , wherein an outer circumferential edge side of the blade of a propeller fan is warped toward an inlet side from an outlet side. 
     
     
         7 . The blower of  claim 6 , wherein regarding a warp formed from the outlet side toward the inlet side in the outer circumferential edge side of the blade of the propeller fan, a degree of the warp becomes gradually smaller from a middle point between a leading edge and a trailing edge toward the trailing edge. 
     
     
         8 . A heat pump apparatus comprising:
 an air outlet face provided on a top face or a side face of an enclosure and disposing a blower thereon,   an air inlet face provided on at least one face except the air outlet face,   a heat exchanger disposed so as to cover the air inlet face; and   a plurality of side plates to form the other faces except the air outlet face and the air inlet face,   wherein the blower includes a blade having an outer circumferential edge having a recessed warp in a rotational direction and an annular bellmouth covering the circumference of the blade at an outlet side; and   wherein a portion of the bellmouth facing a face composed of a rotational trajectory of the outer circumferential edge has a first upstream expanding portion formed in a shape of a convex, facing an upstream direction of a rotation shaft and extending upstream from a minimum inner diameter position at an entire portion of a circumferential direction of the bellmouth and a second upstream expanding portion formed in a shape of a concave, facing the upstream direction of the rotation shaft, being continuous with and extending upstream from the first upstream expanding portion at an entire portion of the circumferential direction of the bellmouth.   
     
     
         9 . The heat pump apparatus of  claim 8 , wherein an upstream portion of the second upstream expanding portion is formed generally in a shape of a cone. 
     
     
         10 . (canceled) 
     
     
         11 . A heat pump apparatus comprising:
 an air outlet face provided on a top face or a side face of an enclosure and disposing a blower thereon,   an air inlet face provided on at least one face except the air outlet face,   a heat exchanger disposed so as to cover the air inlet face; and   a plurality of side plates to form the other faces except the air outlet face and the air inlet face,   wherein the blower includes a blade having an outer circumferential edge having a recessed warp in a rotational direction and an annular bellmouth covering the circumference of the blade at an outlet side; and   wherein a portion of the bellmouth facing a face composed of a rotational trajectory of the outer circumferential edge has a first upstream expanding portion formed in a shape of a convex, facing an upstream direction of a rotation shaft and extending upstream from a minimum inner diameter position at an entire portion of a circumferential direction of the bellmouth and a second upstream expanding portion formed in a shape of a concave, facing the upstream direction of the rotation shaft, being continuous with and extending upstream from the first upstream expanding portion at some portions of the circumferential direction of the bellmouth.   
     
     
         12 . The heat pump apparatus of  claim 11 , wherein an upstream portion of the second upstream expanding portion is formed generally in a shape of a cone. 
     
     
         13 . The heat pump apparatus of  claim 11 , wherein the second upstream expanding portion of the bellmouth has a curved surface at both circumferential ends thereof, the curved surface being formed in a shape of a convex in the direction of a rotation shaft. 
     
     
         14 . The heat pump apparatus of  claim 11 , wherein a circumferential position of the bellmouth where the second upstream expanding portion partly extends upstream from the first upstream expanding portion corresponds to a corner between side faces surrounding the air outlet face of the enclosure. 
     
     
         15 . The heat pump apparatus of  claim 14 , wherein the side faces surrounding the air outlet face of the enclosure consist of the plurality of side plates. 
     
     
         16 . The heat pump apparatus of  claim 14 , wherein the side faces surrounding the air outlet face of the enclosure consist of the plurality of side plates and the heat exchanger. 
     
     
         17 . (canceled)