Propeller fan, fluid feeder and molding die

Abstract

In a propeller fan, a plurality of blades for blowing are coupled together with a space in a rotational direction kept therebetween, and a coupled region has a form for performing the blowing according to the rotation thereof. This structure provides a propeller fan greatly contributing to energy-saving properties and resource-saving design.

1 . A propeller fan, wherein
 a plurality of blades for blowing are coupled together with a space kept in a rotational direction therebetween, and   a coupled region has a form for performing the blowing according to rotation.   
     
     
         2 . The propeller fan according to  claim 1 , wherein
 said coupled region has a blade-surface-like form for performing the blowing according to the rotation.   
     
     
         3 . The propeller fan according to  claim 1 , wherein
 a member for performing rotational driving around said coupled region is integrally arranged.   
     
     
         4 . The propeller fan according to  claim 1 , wherein
 said plurality of blades and the coupled region are integrally molded.   
     
     
         5 . A propeller fan comprising:
 a plurality of blades circumferentially spaced from each other for performing blowing according to rotation; and   a connection portion having a blade-surface-like surface for performing the blowing according to the rotation, and connecting base portions of said plurality of neighboring blades.   
     
     
         6 . The propeller fan according to  claim 5 , wherein
 said connection portion extends radially outward from a rotation shaft for driving and rotating the propeller fan.   
     
     
         7 . The propeller fan according to  claim 5 , wherein
 said connection portion forms said blade-surface-like surface.   
     
     
         8 . The propeller fan according to  claim 5 , wherein
 said plurality of blades and said connection portion form a blade surface having an integral and continuously smooth form.   
     
     
         9 . The propeller fan according to  claim 5 , further comprising:
 a rotation shaft arranged coaxially to a rotation center of said blades and protruding from said connection portion toward at least one of the intake side and the outlet side.   
     
     
         10 . The propeller fan according to  claim 9 , wherein
 when the propeller fan is viewed in the direction of the rotation axis, a minimum distance from the rotation axis to an outer periphery of said connection portion on a line perpendicularly crossing the rotation axis is longer than a distance from the rotation axis to the outer periphery of said rotation shaft on said line.   
     
     
         11 . The propeller fan according to  claim 5 , wherein
 said blade has a front edge located on a forward side in the rotational direction and a rear edge located on the opposite side in the rotational direction, and   a base portion of said front edge of a first blade included among said plurality of blades is connected to a base portion of said rear edge of a second blade neighboring to said first blade.   
     
     
         12 . The propeller fan according to  claim 11 , wherein
 said connection portion extends from the intake side toward the outlet side as the position moves from the base portion of said front edge toward the base portion of said rear edge.   
     
     
         13 . The propeller fan according to  claim 11 , wherein
 said connection portion continues to the blade surface of said blade and extends in a blowing direction from the intake side toward the outlet side as the position moves from the base portion of said front edge toward the base portion of said rear edge.   
     
     
         14 . The propeller fan according to  claim 11 , wherein
 said connection portion is configured to have a function of blowing air in the blowing direction of the propeller fan from the intake side to the outlet side.   
     
     
         15 . The propeller fan according to  claim 11 , wherein
 said front edge is provided with a first convex portion protruding toward a suction surface side of the blade.   
     
     
         16 . The propeller fan according to  claim 11 , wherein
 a coupling portion between said rear edge and said connection portion is provided with a second convex portion protruding oppositely to the rotational direction of said blade.   
     
     
         17 . The propeller fan according to  claim 11 , wherein
 a coupling portion between said rear edge and an outer peripheral portion of said blade is provided with a third convex portion protruding oppositely to the rotational direction of said blade.   
     
     
         18 . The propeller fan according to  claim 11 , wherein
 said rear edge is provided with a concave portion hollowed in the rotational direction of said blade.   
     
     
         19 . The propeller fan according to  claim 18 , wherein
 a length X of a line between opposite ends of said concave portion or a common tangential line with respect to unclear opposite ends of said concave portion is equal to or larger than 0.33 times an outer diameter of said blades, and   a length Y from the line between the opposite ends of said concave portion or said tangential line to the deepest position of said concave portion is equal to or smaller than 0.068 times the outer diameter of said blades.   
     
     
         20 . The propeller fan according to  claim 5 , wherein
 said plurality of blades and said connection portion have a thin-thickness form, and are formed integrally with each other.   
     
     
         21 . The propeller fan according to  claim 5 , wherein
 said blade-surface-like surface is formed continuously to the blade surface of said blade.   
     
     
         22 . The propeller fan according to  claim 21 , wherein
 a blade surface of a first blade among said plurality of blades and a blade surface of a second blade neighboring to said first blade are formed to continue to each other through said blade-surface-like surface.   
     
     
         23 . The propeller fan according to one  claim 21 , wherein
 said blade-surface-like surface includes a first portion continuing from a blade surface of a first blade among said plurality of blades, and a second portion continuing from a blade surface of a second blade neighboring to said first blade, and   said connection portion further has a surface of a not-blade-surface form formed between said first and second portions and arranged coaxially to the rotation center of said blades.   
     
     
         24 . The propeller fan according to  claim 1 , wherein
 said propeller fan is formed by twisting a single plate-like member.   
     
     
         25 . The propeller fan according to  claim 1 , wherein
 said propeller fan is made of a thin integral member having a curved surface.   
     
     
         26 . The propeller fan according to  claim 1 , wherein
 said propeller fan is molded from resin.   
     
     
         27 . A fluid feeder comprising the propeller fan according to  claim 1 . 
     
     
         28 . A molding die used for molding the propeller fan according to  claim 1  from resin. 
     
     
         29 . The molding die according to  claim 28 , comprising:
 a gate for supplying flowable resin, wherein   said blade has a front edge located on a forward side in the rotational direction and a rear edge located on the opposite side, and   said gate is formed in said connection portion or said coupled region, and is located in a position corresponding to a boundary between said front edge of the first blade among said plurality of blades and said rear edge of the second blade neighboring to said first blade.   
     
     
         30 . The molding die according to  claim 28 , comprising:
 a gate for supplying flowable resin, wherein   said blade has a front edge located on a forward side in the rotational direction, and   said gate is formed in said connection portion continuing to the base portion of said blade or said coupled region, and is located in a position corresponding to a vicinity of said front edge.   
     
     
         31 . A propeller fan comprising:
 a plurality of blades circumferentially spaced from each other for performing blowing according to rotation;   a connection portion having a blade-surface-like surface for performing the blowing according to the rotation, and connecting base portions of the plurality of neighboring blades;   a rotation shaft arranged coaxially to a rotation center of said blades, protruding from the intake side of said connection portion, and having an end surface parallel to a plane perpendicular to a direction of a rotation axis of said blades,
 a minimum distance from the rotation axis to an outer periphery of said connection portion on a line perpendicularly crossing the rotation axis being longer than a distance from the rotation axis to the outer periphery of said rotation shaft on said line, when the propeller fan is viewed in the direction of the rotation axis; and 
   a flat surface portion arranged on the outlet side of said connection portion, having an outer form larger than an outer form of said rotation shaft when projected in a direction of the rotation axis of said blades, and having a flat surface parallel to said end surface.   
     
     
         32 . The propeller fan according to  claim 31 , further comprising:
 an annular protrusion protruding from the outlet side of said connection portion, and arranged coaxially to a rotation center of said blades, wherein   said annular protrusion has an inner form larger than the outer form of said rotation shaft when projected in the direction of the rotation axis of said blades.   
     
     
         33 . A propeller fan comprising:
 a plurality of blades circumferentially spaced from each other for performing blowing according to rotation;   a connection portion having a blade-surface-like surface for performing the blowing according to the rotation, and connecting base portions of the plurality of neighboring blades;   a rotation shaft arranged coaxially to a rotation center of said blades, and protruding from the intake side of said connection portion,
 a minimum distance from the rotation axis to an outer periphery of said connection portion on a line perpendicularly crossing the rotation axis being longer than a distance from the rotation axis to the outer periphery of said rotation shaft on said line, when the propeller fan is viewed in the direction of the rotation axis; and 
   an annular protrusion arranged on the intake side of said connection portion, arranged radially outside said rotation shaft and protruding to a position higher than said rotation shaft in the direction of the rotation axis of said blades.   
     
     
         34 . The propeller fan according to  claim 31 , wherein
 a blade surface of a first blade among said plurality of blades continues to a second blade surface of a second blade neighboring to said first blade through said blade-surface-like surface.   
     
     
         35 . The propeller fan according to  claim 31 , wherein
 said propeller fan is molded from resin.   
     
     
         36 . A fluid feeder comprising the propeller fan according to  claim 31 . 
     
     
         37 . A molding die used for molding the propeller fan according to  claim 31  from resin.