JPH0458099A - Fan - Google Patents

Abstract

PURPOSE:In fans used for ventilation or the like, to obtain easily a large-sized fan in low cost by making separate structures of a rotating body and blades. CONSTITUTION:A rotating body 1 and blades 2 are constructed separately. Thereby as for the rotating body 1, even when it is manufactured, for instance, with die casting, the casting mold of which can be made smaller than that where the blades 2 are united to the rotating body 1. As for the blades 2, for instance, by using blades manufactured with extrusion and cut to a specified length, they can be manufactured easily and in low cost even for especially large-sized fans. And by fitting in respective fixing bases 2a of blades 2 in respective fitting grooves 7 on the disc 5 of the rotating body 1, both ends of respective fixing bases 2a of the blades 2 projecting to the front side and the rear side of the disc 5 from the fitting grooves 7 can be positioned on respective fixing pedestals 8 to fix easily. By fixing both ends of respective fixing bases 2a of the blades 2 to respective fixing pedestals 8 so as that they are projected nearly uniformly from fitting grooves 6 on the disc 5 of the rotating body 1, the weight balance of the fan in the axial direction can be improved.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to fans such as ventilation devices and blowers.

(Prior Art) Fans used in ventilation devices and blowers have a structure in which a plurality of blades are arranged in a radial direction around the outer circumference of a rotating body having a boss attached to a rotating shaft at the center.

Conventionally, in a fan having such a structure, the rotating body and the plurality of blades were integrally manufactured by cast molding.

(Problems to be Solved by the Invention) As mentioned above, in conventional fans, the rotating body and the plurality of blades were integrally manufactured by cast molding.
In particular, it is difficult to manufacture large fans, and a large mold is required.Furthermore, a mold is required for each type of fan with a different blade length, resulting in high costs.

The present invention has been made in view of these points, and can be easily manufactured at low cost, especially in the case of large fans, and can also be used with fans with different blade lengths using common parts. The purpose of this invention is to provide a fan that can reduce product costs.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a rotating body 1 having a boss 3 at its center for attachment to a rotating shaft, and a rotary body formed separately from the rotating body 1 and arranged radially on the outer periphery of the rotating body 1. A plurality of blades 2 are arranged along the
The rotating body 1 is provided with a disk portion 5 having the boss 3 at its center, and the fixed base 2 of the blade 2 is attached to the edge of the disk portion 5. A fitting groove 7 for fitting is provided, and a blade 2 protruding from the fitting groove 7 is provided on the front and back surfaces of the disk portion 5.
A fixing base 8 is provided for positioning and fixing both ends of the fixed base 2a.

(Function) In the present invention, by making the rotating body 1 and the blade 2 separate structures, even if the rotating body 1 is manufactured by die-casting, for example, the mold is different from that in the case where the blade 2 is integrated. In order to keep the size of the fan small, the blade 2 is manufactured by extrusion molding and cut into a predetermined length, so that even a large fan can be easily manufactured at low cost. In addition, for fans with different length types of blades, blades 2 manufactured by extrusion molding and cut to the cut length are fixed to a common rotating body 1, so that it can be easily adapted. There is.

Furthermore, by fitting the fixed base 2a of the blade 2 into the fitting groove 7 of the disc part 5 of the rotating body 1, the fixed base 2a of the blade 2 protrudes from the fitting groove 7 to the front and back surfaces of the disc part 5. Both ends are positioned by fixing bases 8 so that they can be easily fixed with bolts, for example.

In addition, by fixing the fixed base 2a of the blade 2 to the fixed base 8 in a state in which both ends of the fixed base 2a protrude almost equally from the fitting groove 6 of the disc part 5 of the rotating body 1, the weight balance in the axial direction of the fan is improved. ing.

(Example) Hereinafter, the configuration of an example of the present invention will be described with reference to the drawings.

The fan includes a rotating body 1 and a plurality of blades 2 arranged along the radial direction around the outer circumference of the rotating body 1.

The rotating body 1 includes a boss 3 for attachment to a rotating shaft driven by a motor or the like, and an annular flange portion 4 on the outer periphery.
The boss 3 and the disk portion 5 connected to the axial center of the flange portion 4 are integrally formed. At each mounting position of the blade 2 of the rotating body 1, a fixed base 2 of the blade 2 is attached to the flange portion 4! A fitting groove 6 into which the blade 2 is fitted is formed in an inclined shape according to the inclination angle of the blade 2, and a fixed base 21 of the blade 2 which is fitted into the fitting groove 6 in the disk portion 5.
A fitting groove 7 is formed in which the blade 2 is fitted, and a fitting groove 7 is formed on the front and back surfaces of the disk portion 5 to protrude along the edge of the fitting groove 6. Fixed base 2! A fixing base 8 to which the two are joined is formed respectively. In addition, each fixed base 8
A screw hole (not shown) is formed in the joining surface 8a to which the blade 2 is joined, and a protrusion 9 into which the edge of the fixed base 2a of the blade 2 fits is formed at the end of the joining surface 8a.
is formed. Furthermore, a rib 10 is formed between the boss 3 and each fixing base 8 on at least one of the front and back surfaces of the disc portion 5.

The blade 2 is formed by extrusion molding to have the same shape in the longitudinal direction, and the fixed base 2a fixed to the rotating body 1 has mounting holes (not shown) corresponding to the screw hole positions of each fixed base 8. is formed.

Next, the operation of this embodiment will be explained.

To assemble the fan, the fixed base 22 of each blade 2 is fitted and inserted from the outside into each fitting groove 6 of the flange portion 4 of the rotating body 1, and the fixed base 2! is fitted into the fitting groove 7 of the disc part 5, and both ends of the fixing base 2a protruding from the fitting groove 7 to the front and back surfaces of the disc part 5 are joined onto the joint surface 8a of each fixing base 8, and , fix the fixing bolt 11 to the base 2
The fixing base 2B is screwed into the screw hole of each fixing base 8 through the attachment hole a, and the fixing base 2B is tightened and fixed to the fixing base 8.

The fan configured in this way includes a rotating body 1 and blades 2.
Since the rotating body 1 is manufactured by die-casting, the mold can be smaller compared to the case where the blade 2 is integrated, and the blade 2 is manufactured by extrusion molding to a predetermined size. It can be cut into lengths, and even large fans can be manufactured easily at low cost.Furthermore, it is possible to manufacture fans with different lengths of blades by extrusion molding. The blade 2 cut into the cutting length is connected to the common rotating body 1.
Unlike the case where the blades 2 are integrated, there is no need for molds for each type of fan with different blade lengths, and product costs can be reduced.

Further, the fixed base 2a of the blade 2 is fitted into the fitting groove 6 of the rotating body 1.
When it is fitted and inserted, its fixing base 2g comes into contact with the fitting groove 7 of the disc part 5 to determine the position in the insertion direction, and the edge of the fitting groove 6 and the protrusion 9 of the fixing base 8 Since the directional positioning is performed, the mounting hole of the fixed base 2a and the screw hole of the fixed base 8 match, and the bolt 11 can be easily screwed into the screw hole through the mounting hole, resulting in good assembly efficiency.

In addition, since both ends of the fixed base 2a of the blade 2 are fixed to the fitting groove 6 of the disk portion 5 of the rotating body 1 in a state in which they protrude almost equally, the weight balance in the axial direction of the fan is good, and the blade mounting portion It is possible to reduce stress fluctuations and make stress uniform.

〔Effect of the invention〕

According to the present invention, since the rotating body and the blade are constructed as separate bodies, even if the rotating body is manufactured by die-casting, the mold for the rotating body can be made smaller than that in the case where the blade is integrated, and the blade is For example, it is possible to use a product manufactured by extrusion molding and cut into a predetermined length.
In particular, even large fans can be easily manufactured at low cost, and for fans with different blade lengths, blades manufactured by extrusion molding and cut to the cut length can be used with a common rotating blade. It can be fixed to the body, and unlike the case where the blades are integrated, there is no need for molds for each type of fan with different blade lengths, and product costs can be reduced.

In addition, by fitting the fixed base of the blade into the fitting groove of the disc part of the rotating body, both ends of the fixed base of the blade that protrude from the fitting groove to the front and back surfaces of the disc part are positioned by the fixing base, for example. It can be easily fixed with bolts, etc., and by fixing it to the fixing base with both ends of the fixed base of the blade protruding almost equally into the fitting groove of the disc part of the rotating body, the fan can be fixed in the axial direction. Improves weight balance,
It is possible to reduce stress fluctuations in the blade attachment portion and to make the stress distribution uniform.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the fan of the present invention, and FIG.
The figure is an enlarged perspective view of a portion thereof. 1...Rotating body, 2...Blade, 2M...Fixed base, 3
...Boss, 5.. Disc part, 7.. Fitting groove, 8.. Fixing base.

Claims (1)

[Claims] (1) The rotating body includes a rotating body having a boss at the center for attachment to the rotating shaft, and a plurality of blades formed separately from the rotating body and arranged along the radial direction on the outer periphery of the rotating body, The body is provided with a disk portion having the boss at the center,
A fitting groove into which the fixed base of the blade is fitted is provided at the edge of the disk, and fixing bases are provided on the front and back surfaces of the disk to position and fix both ends of the fixed base of the blade that protrude from the fitting groove. A fan characterized by: