JP2001132690A - Sirocco fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sirocco fan capable of reducing a material cost without using an auxiliary ring. SOLUTION: A sirocco fan is provided with a pair of blades 2A, 2B arranged via a connecting piece 1, a pair of joining tongue pieces 3A, 3B arranged in a connecting piece side end part of these blades 2A, 2B and a main plate 4 for installing the anti-connecting piece side of the blades 2A, 2B, and the joining tongue piece 3A of the blade 2A is connected to the joining tongue piece 3B of the adjacent blade 2B by welding to obviate an auxiliary ring to obtain the sirocco fan capable of reducing a material cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal sirocco fan used for a blower, a ventilation fan and the like.

[0002]

2. Description of the Related Art In recent years, with the spread of blowers and ventilation fans, it has been demanded that centrifugal force type sirocco fans used in the blowers and ventilation fans do not use auxiliary rings to reduce material costs.

Conventionally, the sirocco fan shown in FIGS. 3 to 5 has been known as an example of this type of sirocco fan. Hereinafter, the configuration will be described with reference to FIGS.

As shown in FIG. 1, a sirocco fan 104 is formed by caulking or welding a U-shaped blade 102 to a main plate 103 via a connecting piece 101. As a result, the blade 102 is distorted on the connecting piece 101 side and the predetermined performance cannot be obtained. Therefore, the auxiliary ring 105 is attached to the connecting piece 101 by welding or caulking.

[0005]

In such a conventional sirocco fan, it is necessary to attach the auxiliary ring 105 to the connecting piece 101 of the blade 102 by welding or the like, so that the large-diameter annular auxiliary ring 105 is formed. However, there is a problem that the material cost is high, and it is required to eliminate the need for the auxiliary ring and to reduce the material cost.

An object of the present invention is to provide a sirocco fan which can solve the above-mentioned problem and can reduce material costs by not using an auxiliary ring.

[0007]

In order to achieve the above object, a sirocco fan according to the present invention has a pair of blades provided via a connecting piece, and a lateral end perpendicular to the blade at one end of the connecting side of the blade. A pair of joining tongues bent toward, and a main plate to which the anti-connecting one side of the blade is attached, and the joining tongue of the blade is connected to a joining tongue provided on an adjacent blade by welding or the like. It is configured.

According to the present invention, there is provided a sirocco fan capable of reducing material costs by not using an auxiliary ring.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a pair of blades provided via a connecting piece, and a pair of joining tongues bent sideways vertically to the blade at one end of the connecting side of the blade. A main plate to which the opposite side of the blade is attached, wherein a joining tongue of the blade is connected to a joining tongue provided on an adjacent blade by welding or the like. This has the effect of eliminating the need for a large-diameter annular auxiliary ring with poor material removal, thereby reducing material costs.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0011]

(Embodiment 1) As shown in FIG. 1, a pair of blades 2A and 2B provided via a connecting piece 1 is connected to a pair of blades 2A and 2B at one end on the connecting piece 1 side in a direction perpendicular to the blades 2A and 2B. A pair of joining tongue pieces 3A and 3B are provided, and a main plate 4 to which the blades 2A and 2B are attached to one side of the anti-connection is provided.

In the above construction, one side of the blade 2A and the other side of the blade 2B are attached to the main plate 4 by welding or caulking in plural pairs, and the joining tongue 3A provided on the side of the connecting piece 1 of the blade 2A is connected to the adjacent blade 2B. The joining tongue piece 3A and the joining portion 5 of the joining tongue piece 3B that are opposed to the joining tongue piece 3B are connected by welding or the like, and each blade 2A
And the joining tongue piece 3A provided on the blade 2B, the joining tongue piece 3B and the connecting piece 1 are connected so as to serve as an auxiliary ring, and the blades 2A and 2B on the connecting piece 1 side of each blade 2A and the blade 2B are connected. Can be eliminated.

As described above, according to the sirocco fan according to the first embodiment of the present invention, the pair of blades 2A and 2B provided via the connecting piece 1 is connected to the ends of the connecting piece 1 side perpendicular to the blades 2A and 2B. A pair of joining tongue pieces 3A and 3B for joining are provided on the blade 2
A and the opposite side of the blade 2B are attached to the main plate 4, the joining tongue 3A of the blade 2A is opposed to the joining tongue 3B of the adjacent blade 2B, and the opposing portion 5 is connected by welding. 3A, the joining tongue piece 3B and the connecting piece 1 serve as an auxiliary ring, eliminating the need to separately provide an auxiliary ring having a large diameter and poor material removal, thereby reducing the material cost and the manufacturing and installation steps of the auxiliary ring. Can be achieved.

(Embodiment 2) As shown in FIG.
Blade 2C and blade 2D provided via
At the end of the connecting piece 1 on the side, a joining tongue piece 3C bent vertically and horizontally on the blade 2C is provided, and the blade 2D is bent into an L-shape to form a U-shaped part 6. A bending tongue piece 3D is provided and configured.

In the above configuration, a plurality of pairs of the opposite sides of the blades 2C and 2D are attached to the main plate 4 by welding or caulking, and the joining tongue pieces 3C provided on the blade 2C are connected to the L-shape of the adjacent blade 2D. The joint tongue 3D is placed on the joining tongue 3D, and the joining tongue 3D is bent.
Is formed, and the joining tongue piece 3D is caulked so as to hold the joining tongue piece 3C, and the joining tongue piece 3C and the joining tongue piece 3D are connected to each other so as to serve as an auxiliary ring together with the connecting piece 1. By connecting, the distortion of the blade 2C and the blade 2D on the connecting piece 1 side can be eliminated.

As described above, according to the sirocco fan of the second embodiment of the present invention, one of the pair of joining tongue pieces 3C and 3D is bent into an L-shape, and
The blade 2 is bent so as to form the
Since the joining tongue piece 3C of C is crimped on the U-shaped portion 6 of the joining tongue piece 3D and the joining tongue piece 3C is held and connected, it is not necessary to separately provide an auxiliary ring having a large diameter and poor material removal. ,
It is possible to reduce the material cost and the steps of manufacturing and mounting the auxiliary ring.

[0017]

As is apparent from the above embodiment, according to the present invention, a pair of blades provided via a connecting piece, and one end of the connecting side of the blade, which is perpendicular to the blade and laterally disposed. Since the pair of bent tongue pieces and the tongue pieces of the blade are connected to the tongue pieces provided on the adjacent blades by welding or the like, the material cost and the manufacturing and mounting steps of the auxiliary ring can be reduced. Sirocco fan can be provided.

Further, one of the pair of joining tongue pieces is bent into an L shape to be bent to form a U-shaped portion, and the joining tongue pieces of the adjacent blades are narrowed. Since the support ring is held and connected, the material cost and the steps of manufacturing and mounting the auxiliary ring can be reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a sirocco fan according to a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a sirocco fan according to a second embodiment of the present invention.

FIG. 3 is an enlarged perspective view of a conventional sirocco fan.

FIG. 4 is a perspective view of the sirocco fan.

FIG. 5 is an enlarged perspective view of a sirocco fan to which the auxiliary ring is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connecting piece 2A blade 2B blade 2C blade 2D blade 3A Joining tongue 3B Joining tongue 3C Joining tongue 3D Joining tongue 4 Main plate 5 Joining part 6 U-shaped part

Claims (2)

[Claims] 1. A pair of blades provided via a connecting piece, a pair of joining tongues bent laterally perpendicular to the blade at one end of the connecting side of the blade, and an opposite connecting side of the blade. A sirocco fan comprising: a main plate to which a tongue is attached; and a joining tongue of the blade connected to a joining tongue provided on an adjacent blade by welding or the like. 2. A joining tongue piece of a pair of joining tongue pieces is bent into an L-shape to be bent to form a U-shaped portion, and a joining tongue piece of an adjacent blade is narrowed. The sirocco fan according to claim 1, which is held and connected.