JPH04116699U - centrifugal fan - Google Patents

Abstract

(57) [Summary] [Purpose] To shorten the cooling hardening time during plastic injection molding, prevent deformation distortion during cooling hardening, and save plastic materials. [Structure] The blade 1 is hollow and has an airfoil shape with a large blade thickness, and the wall thickness is such that it can be injection molded.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a centrifugal fan suitable for air conditioners.

0002

[Conventional technology]

An example of a conventional centrifugal fan is shown in FIGS. 2 and 3, where 1 is an airfoil-shaped blade and 2 is a main plate. , 3 is the side plate, and 4 is the boss, which are made by injection molding plastic material. It is integrally molded. The boss 4 is fixed to the shaft of a motor (not shown). However, when this centrifugal fan is rotated in the direction of the arrow by a motor, air is is sucked in along the axial direction from the suction port 5, is urged by the blade 1, and is drawn from the air outlet 6. It is blown out in the centrifugal direction.

0003

[Problem that the idea aims to solve]

In the conventional centrifugal fan mentioned above, the blades 1 are solid, so Requires a lot of plastic material and requires a long cooling and hardening time during injection molding This increases costs. Also, during this cooling and hardening process, "sink marks" appear on the thicker parts of the blade. This caused the problem of deformation of the airfoil shape and deterioration of the performance of the centrifugal fan. To deal with this, attempts have been made to mix foaming agents into plastic materials. However, this had the problem of further increasing molding time and cost. .

0004

[Means to solve the problem]

This invention was proposed to solve the above problems, and its gist is as follows: However, centrifugal flaps are made by injection molding plastic materials. In a fan, a hollow blade with a large thickness that can be injection molded is provided. A centrifugal fan featuring

[0005]

[Effect] Since this invention has the above configuration, the thickness of the blade is almost uniform throughout. can be converted into

[0006]

【Example】

One embodiment of the invention is shown in FIG. The blade 1 is hollow and has an airfoil shape with a large thickness. The thickness of this blade 1 is injection molded. The thickness of the hollow part 10 is determined to be as thick as possible, that is, 2 to 3 mm or more, and the thickness of the hollow part 10 is the same as that of the male mold during injection molding. From the viewpoint of strength, it is set to be 5 mm or more, and therefore the blade thickness t of the airfoil is increased to approximately 10 mm. Ru.

[0007]

[Effect of the idea]

In this invention, since the blade is hollow, plastic material is used for the hollow part. can be saved. In addition, since the wall thickness of the blade can be made uniform to the minimum thickness that can be injection molded, The cooling and hardening time during molding can be shortened, and "sink marks" do not occur during this process. Therefore, an airfoil without deformation distortion can be quickly obtained. As a result, the cost of centrifugal fans can be reduced, and centrifugal Prevents deterioration in fan performance.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view showing one embodiment of the present invention.

FIG. 2 is a plan view of a conventional centrifugal fan.

FIG. 3 is a partially cutaway side view of a conventional centrifugal fan.

[Explanation of symbols]

1 feather 10 Hollow part 2 Main plate

Claims (1)

[Scope of utility model registration request] 1. A centrifugal fan integrally molded by injection molding a plastic material, characterized in that it includes hollow blades with a large blade thickness and made of a wall thickness that can be injection molded.