JPS6125999A - Turbofan - Google Patents

Abstract

PURPOSE:To aim at improvements in tenaciousness, by using an SPG steel plate for a base plate at the underside and a circular diametral annular plate at the upside as well as blade pieces all for the promotion of lightweightiness to the utmost, and furthermore installing a semicircular curl in an outer edge of the base plate at the underside, while adding beads to the periphery of a boss. CONSTITUTION:A base plate at the underside and a circular diametral annular plate 2 at the upside are made of an SPG steel plate of 0.3mm. in thickness, and a lot of blade pieces made of the same SPG steel plate of 0.3mm. in thickness are attached to both upper and lower plates in two or three spots at an interval between them. With this constitution, as compared with conventional ones, the promotion of lightweightiness to the utmost is attainable. In addition, in order to secure strength, a circular or semicircular curl 6 is installed in an outer edge of the base plate 1 at the underside, while a single or double beads 8 are projectingly installed in the periphery of a boss in the same direction or the reverse direction. Thus, since the curl 6 is installed in the periphery of the base plate 1, favorable tension is given to the plate material on the whole, while owing to an added effect of these beads and the like, a problem on generation of deformation is solved, thus tenaciousness is securable.

Description

[Detailed Description of the Invention] The purpose of the improvement is to extremely reduce the weight, and to produce a product at a low cost that is comparable in strength to, or even stronger than, the conventional construction with a considerable thickness. This is what we intended to provide.

In other words, to explain the drawing as an example, the lower substrate (
11 and the upper circular annular plate (2) are SPG steel plates with a thickness of 0.
．． 3m/m, and the same < SPG steel plate thickness 0.3
% wing pieces (3) are attached to the upper and lower plates in two or three places each. The installation method is to provide insert pieces (4) on both the upper and lower sides of each wing piece (3), and attach these insert pieces to the upper and lower plates (II +21
It is inserted into an insertion hole provided in the holder, the tip thereof is made to protrude, and the protruding part (5) is caulked and fixed to the upper and lower plates.

In addition, even in the case of an aluminum plate, the substrate and annular plate are 05 to 06.
Satisfactory results can be obtained with a percentage of wing pieces of about 06 to 08%.

As mentioned above, the main plan is the upper and lower plates tll +21 and wing pieces (3)
In both cases, the SPG steel plates required for the configuration are all 03m thick.
This is extremely lightweight compared to the conventional one, but in order to obtain strength, the outer edge of the lower board is provided with a circular or semicircular curl (6) and a boss (7). )
A single or double bead (8) is provided around the periphery in the same direction or in the opposite direction, or a bead (8) and a reinforcing plate (9) are shared in the center as shown in Fig. 4, The reinforcing plate is stacked with the board and caulked with a boss (7) to give it strength.Although it is a thin plate, its strength is higher than that of the conventionally manufactured board, annular plate with a thickness of 1.2%, and a wing piece. It is more than comparable to a fan with a configuration of 1.0%, and even though it is an ultra-thin board, there is no outside of the board.
The curling around the periphery gives tension to the entire plate material, and the additional effects of beads etc. eliminate the occurrence of distortion.
This makes it possible to obtain a practical turbo fan that is strong and light, and can therefore be made inexpensive by saving materials and has good performance.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a plan view, and FIG. 2 is a front view of the same, with half of the surface shown in cross section. Third
This figure and FIG. 4 are partial cross-sectional views showing the arrangement of beads or reinforcing plates and curls. In the drawings, (1)...Substrate (2)...Annular plate (3)...Blade piece (4)...Blade piece insertion piece (5)...Protrusion part of insertion piece (6)...Curl (7)...Boss (8)...Bead (9)/Reinforcement plate

Claims (1)

[Claims] In a centrifugal turbo fan in which a large number of blades are fixed and molded radially between the lower board and the upper annular plate, a bearing boss is attached to the center of the lower board and the thickness of the plate is 0. .3m/m
The outer periphery of the boss is curled in a circular or semicircular manner, and a single or double annular bead is provided on the outside of the boss in the same direction or in the opposite direction, or a reinforcing plate is fixed integrally with the boss, and there is a space between the upper and lower plates. A turbo fan having a thin plate structure, characterized in that a large number of blades having a thickness of 0.3 m/m are radially fixed at equal intervals by caulking two or three upper and lower points to the upper and lower plates.