Blower and outdoor unit of air conditioner comprising same

Abstract

Provided are a blower, capable of suppressing noise occurring in a stator while significantly improving blowing efficiency, and an outdoor unit using the same. The present disclosure comprises: a bell mouth part spaced apart at a predetermined distance in the radial direction with respect to an outer circumferential end of a propeller fan; and a diffuser part installed on the downstream side of the bell mouth part, and having a flow path area which is enlarged from the upstream side toward the downstream side with a larger magnification rate than the magnification rate of the flow path area in the downstream end of the bell mouth part; and a stator part having a plurality of stators, wherein the stator part is arranged within the diffuser part.

The invention claimed is: 
     
       1. An outdoor unit for an air conditioner, comprising:
 a first fan having coupled to a first rotation shaft; 
 a second fan having coupled to a second rotation shaft that is parallel to the first rotation shaft; 
 a casing surrounding the first fan and the second fan in a vertical direction;  
 a first bell mouth part and a second bell mouth part, each of the first bell mouth part and the second bell mouth part to guide air introduced into the first fan and the second fan, respectively, while the first fan and the second fan respectively discharge the air, each of the first bell mouth part and the second bell mouth part having a downstream end and being spaced apart from outer circumferential ends of the first fan and the second fan, respectively; 
 a first diffuser part obliquely extending from the downstream end of the first bell mouth part to guide the air discharged from the first fan, the first diffuser part having a first inner circumferential surface inclined at first inclination angles with respect to the first rotation shaft, the first inclination angles varied along a circumferential direction of the first fan;, the first diffuser part forming a first opening at a downstream end of the first inner circumferential surface;  
 a second diffuser part obliquely extending from the downstream end of the second bell mouth part to guide the air discharged from the second fan, the second diffuser part having a second inner circumferential surface inclined at second inclination angles with respect to the second rotation shaft, the second inclination angles varied along a circumferential direction of the second fan, the second diffuser part forming a second opening at a downstream end of the second inner circumferential surface; 
 wherein when a length of a major axis of the first opening is W and a length of a minor axis of the first opening is D, lengths of the first opening is set to satisfy 0.75<D/W<1, and 
 wherein when a length of a major axis of the second opening is W and a length of a minor axis of the second opening is D, lengths of the second opening is set to satisfy 0.75<D/W<1;  
 wherein: 
 the first diffuser part and the second diffuser part are disposed inside the casing in the vertical direction,  
 a portion ofthe first inner circumferential surface of the first diffuser part at a minor axis of the first diffuser part and a portion of the second inner circumferential surface of the second diffuser part at a minor axis of the second diffuser part are adjacent to each other, 
 the portion ofthe first inner circumferential surface of the first diffuser part at the minor axis of the first diffuser part is inclined at at least one first inclination angle from among the first inclination angles of the first diffuser part, 
 the portion ofthe second inner circumferential surface of the second diffuser part at the minor axis of the second diffuser part is inclined at at least one second inclination angle from among the second inclination angles of the second diffuser part, 
 the at least one first inclination angle from among the first inclination angles of the first diffuser part is smaller than at least one other first inclination angle from among the first inclination angles of the first diffuser part, and 
 the at least one second inclination angle from among the second inclination angles of the second diffuser part is smaller than at least one other second inclination angle from among the second inclination angles of the second diffuser part, and 
 a downstream end of the first diffuser part and a downstream end of the second diffuser part are surrounded by four side walls of the casing. 
 
     
     
       2. The outdoor unit according to  claim 1 , wherein:
 the first diffuser part includes a first opening formed at a downstream end of the first inner circumferential surface;   the second diffuser part includes a second opening formed at a downstream end of the second inner circumferential surfaces; and   the first opening and the second opening are formed to be opposite to each other.   
     
     
       3. The outdoor unit according to claim  2  1, wherein each of the first inclination angles (θ) and the second inclination angles (θ) are each provided in a range of 3°≤θ≤35°. 
     
     
       4. The outdoor unit according to claim  2  1, wherein:
 a length of the first inner circumferential surface of the first diffuser part defined as a length between an upstream end and the downstream end of the first diffuser part increases as the inclination angle of the first diffuser part increases; and 
 a length of the second inner circumferential surface of the second diffuser part defined as a length between an upstream end and the downstream end of the second diffuser part increases as the inclination angle of the second diffuser part increases. 
 
     
     
       5. The outdoor unit according to claim  2  1, wherein:
 the rotation shaft of the first fan is disposed at a center of the first opening; and 
 the rotation shaft of the second fan is disposed at a center of the second opening. 
 
     
     
       6. The outdoor unit according to  claim 2 , wherein when a length of a major axis of the first opening is W and a length of a minor axis of the first opening is D, the lengths of the first and second openings are set to satisfy 0.75<D/W<1. 
     
     
       7. The outdoor unit according to  claim 1 , wherein:
 the first diffuser part includes a first opening formed at a downstream end of the first inner circumferential surface; and 
 the first opening is provided in an oval shape. 
 
     
     
       8. The outdoor unit according to  claim 1 , wherein:
 the first diffuser part includes a first opening formed at a downstream end of the first inner circumferential surface; and 
 the first opening is provided in a polygonal shape having at least three corners. 
 
     
     
       9. The outdoor unit according to  claim 1 , wherein the at least one first inclination angle (α) from among the first inclination angles of the first diffuser part and the at least one second inclination angle (α) from among the first inclination angles of the second diffuser part are each provided in a range of 3°≤α≤7°. 
     
     
       10. The outdoor unit according to  claim 1 , further comprising wherein:
 a casing includingthe four side walls of the casing include:
 a first surface wall extending in a direction the first and second fans are disposed and to cover one side of the first fan and one side of the second fan,   a second surface wall configured to cover the other side of the first fan and the other side of the second fan while disposed parallel to the first surface wall,   a third surface wall configured to cover the first fan while disposed between the first surface wall and the second surface wall, and   a fourth surface wall configured to cover the second fan while disposed parallel to the third surface wall; and   
 at least one heat exchanger disposed between the casing and the first and second fans and formed along the third surface wall, the first surface wall, and the fourth surface wall. 
 
     
     
       11. The outdoor unit according to  claim 10 , wherein the heat exchanger formed along the third surface wall, the first surface wall, and the fourth surface is also formed along at least a portion of wall extends toward the second surface wall. 
     
     
       12. The outdoor unit according to  claim 10 , wherein the first inclination angles of the first diffuser part and the second inclination angles of the second diffuser part respectively have maximum values when the first diffuser part and the second diffuser part respectively face the first surface wall and the second surface wall. 
     
     
       13. The outdoor unit according to  claim 10 , wherein the first inclination angles of the first diffuser part and the second inclination angles of the second diffuser parts each have minimum values when the first diffuser part and the second diffuser part respectively face the third surface walland the fourth surface wall. 
     
     
       14. An outdoor unit for an air conditioner, comprising:
 a pair of fans each having a rotation shaft provided vertically; 
 a casing including four surfaces walls that extend verticallywhile covering vertical sides of the pair of fans; 
 a pair of fans, each coupled to a respective rotation shaft provided vertically and disposed inside the casing in a vertical direction;  
 a heat exchanger disposed between the casing and the pair of fans and extended along at least three surfaces walls of the four surfaces walls; 
 a pair of bell mouth parts respectively provided for the pair of fans and disposed to be spaced apart from outer circumferential ends of each of the pair of fans, each bell mouth of the pair of bell mouth parts configured to guide air introduced into a respective fan of the pair of fans while the pair of fans discharge the air, the pair of bell mouth parts respectively having downstream ends; and 
 a pair of diffuser parts respectively disposed at downstream ends of the pair of bell mouth parts and obliquely extending in directions toward which the air is to be discharged, to guide the air discharged from the pair of fans, and the pair of diffuser parts including a pair of inner circumferential surfaces, respectively; 
 a pair of openings are respectively formed at downstream ends of the pair of inner circumferential surfaces and each of the pair of openings has a shape corresponding to each other; 
 wherein when a length of a major axis of the pair of openings is W and a length of a minor axis of the pair of openings is D, the lengths of the pair of openings are set to satisfy 0.75<D/W<1;  
 wherein
 the pair of diffuser parts are disposed inside the casing in the vertical direction, 
 downstream ends of the pair of diffuser parts are surrounded by the four walls of the casing,  
 the inner circumferential surface of each of the pair of diffuser parts have an inner circumferential surfaceis inclined at an inclination angle that areis varied along circumferential directionsdirection of a respective diffuser part of the pair of diffuser parts with respect to respective rotation shaft of the rotation shafts of the pair of fans, and 
 the inclination angle of the respective diffuser part has a minimum value at first portions of the inner circumferential surfaces where the pair of diffuser parts are adjacent to each other at respective minor axes of the pair of diffuser parts. 
 
 
     
     
       15. The outdoor unit according to  claim 14 , wherein at the first portions of each of the inner circumferential surfaces at the respective minor axes of the pair of diffuser parts, the inclination angle (θ) of the respective diffuser part of the pair of diffuser parts is provided in a range of 3°≤θ≤7°. 
     
     
       16. The outdoor unit according to  claim 14 , wherein the inclination angle (θ) of the respective diffuser part of the pair of diffuser parts is provided in a range of 3°≤θ≤35°. 
     
     
       17. The outdoor unit according to  claim 14 , wherein:
 a pair of openings is respectively formed at downstream ends of the pair of inner circumferential surfaces; and   each of the pair of openings has a shape corresponding to each other.   
     
     
       18. The outdoor unit according to claim  17  14, wherein each opening of the pair of openings is provided in an oval shape. 
     
     
       19. The outdoor unit according to  claim 17 , wherein each opening of the pair of openings are provided in a polygonal shape having at least three corners. 
     
     
       20. The outdoor unit according to claim  17  14, further comprising a pair of stator parts, each stator of the pair of stator parts including a plurality of noise prevention blades,
 wherein the pair of stator parts are respectively provided on the pair of inner circumferential surfaces. 
 
     
     
       21. An outdoor unit for an air conditioner, comprising:
 a casing including four walls that extend vertically;   a pair of fans, each coupled to a respective rotation shaft provided vertically and disposed inside the casing in a vertical direction;   a heat exchanger extended along at least three walls of the four walls of the casing;   a pair of bell mouth parts respectively provided for the pair of fans and disposed to be spaced apart from outer circumferential ends of each of the pair of fans, each bell mouth of the pair of bell mouth parts configured to guide air introduced into a respective fan of the pair of fans while the pair of fans discharge the air, the pair of bell mouth parts respectively having downstream ends;   a pair of diffuser parts respectively disposed at downstream ends of the pair of bell mouth parts and obliquely extending in directions toward which the air is to be discharged, to guide the air discharged from the pair of fans and the pair of diffuser parts including a pair of inner circumferential surfaces, respectively, and   a pair of openings respectively formed at downstream ends of a pair of inner circumferential surfaces, each of the pair of openings has a shape corresponding to each other;   wherein when a length of a major axis of the pair of openings is W and a length of a minor axis of the pair of openings is D, the lengths of the pair of openings are set to satisfy 0.75<D/W<1;   wherein
 the pair of diffuser parts are disposed inside the casing in the vertical direction, 
 the inner circumferential surface of each of the pair of diffuser parts is inclined at a diffuser angle that is varied along circumferential direction of a respective diffuser part of the pair of diffuser parts with respect to the respective rotation shaft of the rotation shafts of the pair of fans, and the inclination angle of the respective diffuser part has a minimum value at first portions of the inner circumferential surfaces where the pair of diffuser parts are adjacent to each other. 
 each of the pair of diffuser parts, in a major axis direction from a front to a rear, has a first diffuser angle, 
 each of the pair of diffuser parts, in a minor axis direction from one side to another side, has a second diffuser angle, 
 the second diffuser angle is smaller than the first diffuser angle, and 
 downstream ends of the pair of diffuser parts are surrounded by the four walls of the casing.  
   
     
     
       22. The outdoor unit according to claim 21, wherein the pair of diffuser parts is disposed inside the casing in a vertical direction.  
     
     
       23. The outdoor unit according to claim 21, wherein, for each of the diffuser parts, the second diffuser angle is a lowest diffuser angle among a plurality diffuser angles along circumferential directions of the diffuser part.  
     
     
       24. The outdoor unit according to claim 21, wherein the first diffuser angle is a highest diffuser angle among a plurality of diffuser angles along circumferential directions of the diffuser part.  
     
     
       25. The outdoor unit according to claim 23, wherein the second diffuser angle is provided in a range of 3°≤θ≤7°.  
     
     
       26. The outdoor unit according to claim 24, wherein the first diffuser angle is provided in a range of 3°≤θ≤35°.  
     
     
       27. The outdoor unit according to claim 21, wherein each opening of the pair of openings is provided in an oval shape.  
     
     
       28. The outdoor unit according to claim 1, wherein
 a distance from a center of rotation of the first fan to a corner of the casing, formed by two side walls of the four side walls of the casing, is defined by L1+L2,   wherein L1 is a distance from the corner of the casing to an outer edge of the first diffuser part, L2 is a distance from the center of rotation of the first fan to the outer edge of the first diffuser part, and Dratio=L2/(L1+L2) satisfies 0.60≤Dratio≤0.95.    
     
     
       29. The outdoor unit according to claim 14, wherein
 a distance from a center of rotation of a fan of the pair of fans to a corner of the casing, formed by two side walls of the four side walls of the casing, is defined by L1+L2,   wherein L1 is a distance from the corner of the casing to an outer edge of a diffuser part of the pair of diffusor parts, L2 is a distance from the center of rotation of the fan of the pair of fans to the outer edge of the diffuser part of the pair of diffuser parts, and Dratio=L2/(L1+L2) satisfies 0.60≤Dratio≤0.95.    
     
     
       30. The outdoor unit according to claim 21, wherein
 a distance from a center of rotation of a fan of the pair of fans to a corner of the casing, formed by two side walls of the four side walls of the casing, is defined by L1+L2,   wherein L1 is a distance from the corner of the casing to an outer edge of a diffuser part of the pair of diffuser parts, L2 is a distance from the center of rotation of the fan of the pair of fans to the outer edge of the diffuser part of the pair of diffuser parts, and Dratio=L2/(L1+L2) satisfies 0.60≤Dratio≤0.95.