Patent Publication Number: US-2011072844-A1

Title: Heat exchange system

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     Pursuant to 35 U.S.C. §119 and the Paris Convention Treaty, this application claims the benefit of Chinese Patent Application No. 200920236976.3 filed on Sep. 30, 2009, the contents of which are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a heat exchange system. 
     2. Description of the Related Art 
       FIG. 1  is a schematic view of a heat exchange system in the related art. In this heat exchange system of an outdoor fan unit for an air conditioner, multiple grids  1  are disposed at an exhaust outlet  6  of a box  4 , a blower  2  is disposed in the box  4  and below the grid  1 , and the blower  2  comprises a drive motor  7 , and a wind blade  9  or a wind wheel disposed on a motor shaft  8  of the drive motor  7 . Problems with the system are: 1) rotational inertia of the drive motor  7  of the blower  2  is small, the wind blade  9  of the blow  2  is far away from the exhaust outlet  6 , and thus having a high wind pressure coefficient, large wind resistance, and low efficiency, which causes the blower  2  to blow small amount of wind from the exhaust outlet  6  of the box  4 , and thus an ideal blowing effect cannot be facilitated; 2) the drive motor  7  of the blower  2  has large fluctuation in rotating torsion, namely large resonance, which causes the wind blade  9  or the wind wheel to rotate unstably, and affects blowing effects; 3) the heat exchange system employing the blower structure is low efficient and power consuming, and cannot meet requirement of the current society for energy conservation and environmental protection. 
     SUMMARY OF THE INVENTION 
     In view of the above-described problem, it is one objective of the invention to provide a heat exchange system that features simple structure, low cost, large air output, and good blowing effect, and is high efficient and power saving. 
     To achieve the above objectives, in accordance with one embodiment of the invention, provided is a heat exchange system, comprising multiple grids, a blower comprising an external rotor motor and a wind blade, a compressor, and a box having multiple exhaust inlets. The exhaust inlets are disposed on the side of the box, the grid is disposed at the exhaust outlet of the box, the blower is disposed in the box and below the grid, the compressor is disposed on bottom surface in the box, the blower is an external rotor axial fan, and the wind blade is disposed outside a rotor of the external rotor motor. 
     In a class of this embodiment, the wind blade is disposed outside the rotor of the external rotor motor via a support, the support comprises an annular cylinder, and multiple mounting feet extending from the annular cylinder, the wind blade is disposed on the mounting foot, and the annular cylinder is fit on the rotor of the external rotor motor. 
     In a class of this embodiment, the wind blade is an equal-width blade and in the vicinity of the exhaust outlet of the box. 
     In a class of this embodiment, the annular cylinder is an integral formed cylinder, or a cylinder formed via an annular body with an opening. 
     In a class of this embodiment, inner wall of the annular cylinder is interference fit with outer wall of the rotor. 
     In a class of this embodiment, a screw hole is disposed on the mounting foot, and the wind blade is disposed on the mounting foot via a bolt and a nut. 
     In a class of this embodiment, a through hole is disposed on the mounting foot, and the wind blade is connected to the mounting foot via a rivet. 
     In a class of this embodiment, the wind blade is directly welded on the mounting foot, or directly welded on the outside of the rotor of the external rotor motor. 
     In a class of this embodiment, the wind blade is disposed on the mounting foot via buckling. 
     In a class of this embodiment, the annular cylinder and the mounting foot are integrally formed, or connected to each other as two independent parts via welding, buckling, or riveting. 
     Advantages of the invention comprise: 
     1) the blower uses the external rotor axial fan, the rotor thereof features large rotational inertia, small fluctuation in torsion, and stable operation, and the wind blade is close to the exhaust outlet and has a low wind pressure coefficient, small wind resistance, and high efficiency, which causes the external rotor axial fan to blow large amount of wind from the exhaust outlet of the box and thus improving blowing effect; 2) the heat exchange system features high overall efficiency and low power consumption, and meets requirement of the current society for energy conservation and environmental protection; 3) the wind blade is an equal-width blade with a large area and in the vicinity of the exhaust outlet of the box, and thus greatly improving inducing capacity of the external rotor axial fan, and blowing effect of the heat exchange system; 4) the annular cylinder on the support is fit on a housing of the rotor of the external rotor motor, and the inner wall of the annular cylinder is interference fit with the outer wall of the rotor, which make the invention have simple assembling, reliable connection, high production efficiency, low processing difficulty, and reduced production cost; 5) the external rotor axial fan is combined and features simple installation and disassembly, and the external rotor motor and the wind blade can be transported separated, which reduces transportation cost; 6) by using the external rotor axial fan, overall volume of the heat exchange system and system cost are reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of a heat exchange system in the related art; 
         FIG. 2  is a schematic view of a heat exchange system of an exemplary embodiment of the invention; 
         FIG. 3  is a schematic view of an external rotor axial fan in  FIG. 2 ; 
         FIG. 4  is another schematic view of the external rotor axial fan in  FIG. 3 ; 
         FIG. 5  is a cross-sectional view of  FIG. 4  along a line A-A; and 
         FIG. 6  is an enlarged view of  FIG. 5  along a line B-B. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Further description of the invention will be given below in conjunction with specific embodiments and accompanying drawings. 
     As shown in  FIGS. 2 ,  3  and  4 , a heat exchange system of the invention comprises multiple grids  1 , a blower  2 , a compressor  3 , and a box  4  having multiple exhaust inlets  5  on the side thereof. The grid  1  is disposed at an exhaust outlet  6  of the box  4 , the blower  2  is disposed in the box  4  and below the grid  1 , the compressor  3  is disposed on bottom surface in the box  4 . The blower  2  is an external rotor axial fan, and comprises an external rotor motor  7  and a wind blade  8 , and the wind blade  8  is disposed outside a rotor  71  of the external rotor motor  7 . 
     The wind blade  8  is disposed outside the rotor  71  of the external rotor motor  7  via a support  9 , the support  9  comprises an annular cylinder  91 , and multiple mounting feet  92  extending from the annular cylinder  91 , the wind blade  8  is disposed on the mounting foot  92 , and the annular cylinder  91  is fit on the rotor  71  of the external rotor motor  7 . The wind blade  8  is an equal-width blade and in the vicinity of the exhaust outlet  6  of the box  4 . The annular cylinder  91  is a cylinder formed via an annular body with an opening, and specifically is a closed cylinder formed by the annular body with the opening via a fastening device  10 . As shown in  FIGS. 5 and 6 , the external rotor motor comprises a rotor  71  and a stator  72 , and inner wall of the annular cylinder  91  is interference fit with outer wall of the rotor  71 . A through hole is disposed on the mounting foot  92 , and the wind blade  8  is connected to the mounting foot  92  via a rivet  11 . The annular cylinder  91  and the mounting foot  92  are integrally formed, or connected to each other as two independent parts via welding, buckling, or riveting. 
     In addition, the annular cylinder  91  is an integral formed cylinder, or a closed cylinder made via welding. Alternatively, a screw hole is disposed on the wind blade  8 , and the wind blade  8  is disposed on the mounting foot  92  via a bolt and a nut. Alternatively, the wind blade  8  is directly welded on the mounting foot  92 , or directly welded on the outside of the rotor  71  of the external rotor motor  7 . Alternatively, the wind blade  8  is disposed on the mounting foot  92  via buckling. 
     The blower  2  of the invention uses the external rotor axial fan that features large rotational inertia, small fluctuation in torsion, and stable operation, and the wind blade  8  is close to the exhaust outlet  6  and has a low wind pressure coefficient, small wind resistance, and high efficiency, which causes the external rotor axial fan to blow large amount of wind from the exhaust outlet  6  of the box  4  and thus improving blowing effect; the heat exchange system features high overall efficiency and low power consumption, and meets requirement of the current society for energy conservation and environmental protection; the wind blade  8  is an equal-width blade with a large area and in the vicinity of the exhaust outlet  6  of the box  4 , and thus greatly improving inducing capacity of the external rotor axial fan, and blowing effect of the heat exchange system. 
     While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.