JPS6122158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a large number of notched grooves on the outer periphery of a disc,
The present invention relates to a method of manufacturing a cylindrical multi-blade fan in which blades having a desired cross-sectional shape are fixed to this groove.

Figure 1 shows the manufacturing method of a conventional cylindrical multi-blade fan.
This will be explained with reference to FIG. As shown in FIG. 1, the blade 1 is formed from a flat plate into a desired cross-sectional shape. The discs 2 located at both ends of the fan have a wing-shaped elongated hole 4 formed on their circumference as shown in FIG. Form into. Then, the blade 1 is inserted into the notched groove 5 of the intermediate disk 3, the both ends of the blade 1 are inserted into the long holes of the disk 2, the end surface 6 is bent as shown in FIG. 4, and the end surface 6 is bent as shown in FIG. The blade 1 and the disks 2 and 3 are fixed by crushing a portion 7 of the disk from the radial direction.

According to this manufacturing method, when the end of the wing 1 is bent and fixed, it must be bent after the wing is installed, making it impossible to use an appropriate bending die and making accurate bending difficult. , assembly accuracy and supporting capacity were both very poor. Furthermore, since the disk is caulked only in a very small portion in the radial direction, the supporting force is weak, and adhesives or the like must often be used in combination. To this end, it is conceivable to make the long holes 4 and notch grooves 5 of the blade 1 as close to the cross-sectional shape of the blade 1 as possible to reduce the spacing, ensure the fixation of the blade 1, and improve assembly accuracy. Implantation became difficult and assembly work became extremely difficult.

The present invention has been made in an attempt to eliminate such deficiencies. That is, a large number of notched grooves 10 are formed on the outer circumferential portion of the disc 9, the contour line 11 of the notched groove 10 in contact with the blade 8 is made to match the shape of the blade 8, and the contour line on the other side of the notched groove 10 is made to match the shape of the blade 8. 12 is made sufficiently wider than the thickness of the blade 8, and after the blade 8 is implanted in the notch groove 10, a triangular portion surrounded by the outer periphery 13 of the disk 9 and the contour line 12 on the other side of the notch groove 10 is formed. To provide a method for manufacturing a cylindrical multi-blade fan, characterized in that the blade 8 is fixed by thinning the blade 14 by cold compression processing and moving the material of the part 14 to narrow the notch groove 10. It is.

The present invention will be explained below with reference to an embodiment shown in FIGS. 6 to 9.

The blade 8 has the same width over its entire length and is formed into an arcuate cross-sectional shape. All of the disks 9 have the same shape, and a large number of notched grooves 10 are formed on the outer periphery. The contour line 11 of this notch groove 10 in contact with the blade 8 is made to coincide with the blade blade 8, and the notch groove 1
The contour line 12 on the other side of the blade 8 is made wider by about 1.2 to 2 times the thickness of the blade 8. Then, the blade 8 is inserted into the cutout groove 1 of the disc 9.
0, a substantially triangular portion 14 surrounded by the disk outer periphery 13 and the notch groove outline 12 is thinned by cold compression processing, and the material of that portion 14 is made into the notch groove 10.
The blade 8 is fixed by moving it in the direction of making it thinner, as shown by the crush 15 shown in the imaginary line.

According to the manufacturing method of such a cylindrical multi-blade fan,
Since the cutout groove 10 of the disc 9 is made sufficiently wider than the thickness of the blade 8, the workability of assembling the blade 8 can also be significantly improved. In addition, the contour line 12 of the notch groove 10
The triangular portion 14 surrounded by the disk outer periphery 13 is thinned by cold compression processing, the material of that portion 14 is moved, the notch groove 10 is made thinner as shown by the crushed portion 15 shown in the imaginary line, and the wing 8 is fixed. Therefore, it is possible to fix it with a planned and easy operation, and the crushing part 15 and the blade 8 can be in line contact to achieve strong fixation. According to experiments, the supporting force of the blade 8 was greater than the buckling force of the blade 8 when the thickness of the disk 9 was compressed by 30 to 35%. Furthermore, since the contour line 11 of the cutout groove 10 substantially coincides with the blade 8, the blade 8 can be assembled with high accuracy.

[Brief explanation of the drawing]

Figures 1 to 5 are diagrams explaining the conventional manufacturing method of a cylindrical multi-blade fan, in which Figure 1 is a perspective view of the blade, Figures 2 and 3 are plan views of different disks, and Figure 4 is a perspective view of the blade. The figure is a partial external view of a cylindrical multi-blade fan, Fig. 5 is a cross-sectional view of the blade fixing part, and Figs. 6 is a perspective view of the wing, FIG. 7 is a sectional view of the wing fixing part, FIG. 8 is a plan view of the cylindrical multi-blade fan, and FIG. 9 is a side view of the fan. 1... Wing, 2... Disc, 3... Disc, 4... Long hole, 5...
Notch groove, 6... Wing end surface bending part, 7... Caulking part for fixing the wing of disk, 8... Wing, 9... Disc, 10... Notch groove, 1
1... Contour line that coincides with the wing, 12... Contour line on the opposite side of the profile line that coincides with the wing, 13... Outer periphery of the disk, 14
... Triangular portion subjected to cold compression processing, 15... Collapsed portion due to cold compression processing.

Claims (1)

[Claims] 1 Form a blade by cutting both ends into a straight line, forming a disk having notch grooves at equal intervals on the circumference, and the notch grooves having a width larger than the thickness dimension of the blade and a notch groove. The blade is implanted into the notch groove with the contour line of one side matching the shape of the blade and the discs arranged at predetermined intervals, and then the outer periphery of the disc and the other side of the notch groove are aligned. A method for manufacturing a multi-blade fan characterized by forming a crushed part by extruding a triangular part between the contour line 12, bringing the crushed part into pressure contact with the blade, and fixing the blade and the disc. .