JPS5847197A - Turbofan - Google Patents

Abstract

PURPOSE:To prevent generation of warp by almost uniformly bending the circumferential edge part of the disk serving as a basic board, thus reinforcing the disk. CONSTITUTION:As for a washer 5 and a dixk 1, one or plural through-holes or concave parts are formed on the disk 1, and the projection parts 7 for fitting purpose are formed on the washer 5, while setting their positions to the plural through-holes on the disk 1, and the projection parts on the washer are fitted with through-holes or concave parts on the disk, and the both are clamped under pressure by boss-caulking. Therefore, the center part of the disk is further strengthened, and thus perfectly flat disk free from the deformation in future can be held through the above works onto the bent circumferential edge and the center part of the disk.

Description

[Detailed Description of the Invention] The present invention relates to the development of a disk that serves as the base of a centrifugal turbo fan. I was trying to get a turbo fan.

That is, to explain the drawing which is an example, the peripheral edge of the disc il+ serving as the base is bent downward or pressed, etc., and the shape is formed into a curved line (21). The disk formed in this way (1
) A large number of wing pieces (X3) are caulked radially outward from the center on the back side (planted by 81, with a boss hole in the center + 41 ff: punched, and washers of appropriate thickness are placed above and below this boss hole) (5) This washer and the disk are fixed by fitting and tightening the boss (6).
And disc (1) is a disc with one or several holes or recesses.

The washer is provided with a protrusion (71) for fitting downwardly in line with the through-hole of the disc, and the protrusion of the washer and the through-hole or concave part of the disc fit together, and the crimping is done in a circular manner by caulking the boss. The central portion of the plate is further strengthened, and the bending of the peripheral edge and the center portion of the disk as described above maintains a flat disk that will not be deformed in the future.

As described above, in the present invention, in a centrifugal turbo fan, the deterioration in performance during use is often caused by deformation of the disk. In other words, in order to reduce costs, it is common for conventional turbofan discs to be used as cordless units. As the blades are prone to distortion and deformation, the blades cannot accommodate the casing, etc., which often results in poor performance. In order to eliminate this problem, the circumference #s of the disc serving as the base is bent to the same extent as in the present invention, so it is reinforced regardless of the thickness of the plate and will not go out of order even if used for a long time. An ideal turbo fan was obtained without this problem.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention; Fig. 1 is a plan view, and Fig. 2 is a side view of the same half-section, with the wing pieces omitted; Fig. 3 is the bottom view of Fig. 1. The figure shows the state in which the upper wing pieces have been installed by caulking. In the drawings, fi+...Disc (21...Curved edge due to bending of the same periphery (:31...
- Wing piece (41...Boss mounting hole (51...Washer (61...Boss (7)...Protrusion for fitting provided on the washer (81...Caulking of the wing piece)

Claims (1)

[Claims] In a centrifugal turbo fan constructed by installing blades radially on a single disc, the peripheral edge of the disc is bent slightly downward or drawn into a curved edge, and the top surface is shaped into a curved edge. The wing pieces are swaged approximately radially and installed using other methods, and washers of appropriate thickness are applied from above and below to the boss mounting hole provided in the center, and the bosses are used to attach the washers and the disk to the bottom surface. A turbo fan characterized by being fixed by caulking.