JPS63289293A - Impeller for multiblade blower - Google Patents

Abstract

PURPOSE:To increase the mechanical strength of a sub-plate and to enable the blower to be miniaturized by bending the outer peripheral ends of the sub- plate having plural blades and an air intake to form the blower. CONSTITUTION:A blower is formed so that a multiblade impeller b is arranged in a volute type casing a. The impeller b is provided with many blades 5 of circular arc cross-section arranged parallel to a rotary shaft between a main plate 1 having a flat permanent magnet 2 outside and a sub-plate 3 having an air intake 4 at the center. The outer peripheral ends of the main plate 1 and sub-plate 3 are bent toward the outside of the impeller b, and their tips are projected from the impeller close to the internal surface of a casing (a). Thus, since the mechanical strength of the sub-plate 3 can be increased, many blades of short circular arc length can be installed. If the same performance as that used previously is required, the impeller can be miniaturized, and thus, a compact blower can also be made.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the blades of a multi-blade blower used in air-conditioning cough machines and the like.

Conventional techniques i, Go Conventionally, as shown in FIGS. 3 and 4, the impeller d of a multi-blade blower has a circular cross-section between the main plate 1 and the sub-plate 3 having an air inlet 4 in the center. A large number of arc-shaped blades 2 are arranged parallel to the rotation axis, and these blades are placed in a spiral casing 5 and simultaneously rotated by a motor 6 fixed outside the casing 5. In addition, the impeller d has the main plate 1
The sub-plate 3 was formed into a flat plate shape, the arc length of the blade 2 was made long, and the number of blades 2 was designed to be about 35. Here, 7 indicates an air supply port provided in the casing 5, 8 indicates a discharge port, and FIG. 4 shows a sectional view taken along the line B--B in FIG. 3.

In FIG. 3 and FIG. 4, the impeller d is rotated by driving the motor 6, and the flow from the air supply lower provided in the casing 5 to the discharge port 8 is caused by the impeller d blowing against the arrangement of a large number of clay figurines 2. There is a tendency for the air blowing efficiency of car d to improve.

However, when manufacturing such an impeller d, the sub-plate 3
It is also necessary to reduce the radial width of. For this reason, in the conventional embroidery method, the mechanical strength of the sub-plate 3 decreases.
The inner/outer diameter ratio D1/D2, which is expressed as the ratio of the inner diameter D1 and the outer diameter D2 of the impeller, was set to a small value 1 to 1 to increase the arc length of the blade 2, and the number of blades 1 was designed to be approximately 35 blades. It is something. For this reason, the impeller d could not be downsized, which hindered downsizing of the blower.

The present invention solves these conventional problems, and provides a multi-blade blower blade that increases the mechanical strength of the sub-plate without reducing the efficiency of the impeller, thereby reducing the size of the blower. A car can be provided.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention comprises a main plate having a boss and a sub-plate having a plurality of blades and an air inlet to the impeller. The impeller is constructed by bending the outer peripheral end.

Effect The present invention can significantly increase the mechanical strength of the sub-plate with the above-described configuration and reduce the radial width of the sub-plate. This makes it possible to set a large ratio of the inner and outer diameters of the wheel, thereby improving the efficiency of the impeller.

Embodiments Hereinafter, embodiments of the present invention will be described using the drawings. 1st
The figure shows a blower constructed by arranging a multi-blade impeller in a spiral caning a. Inlet 4
A large number of blades 5 each having an arcuate cross section are arranged parallel to the rotation axis between the blades 3 and the sub-plate 3 having an arc shape. Further, the outer peripheral end of the main plate 1 is bent toward the outside of the impeller, and the outer peripheral end of the sub-plate 3 is also bent toward the outside of the impeller, with its tip protruding close to the inner surface of the casing a. Furthermore, the main plate 1 is recessed inward of the impeller, and the permanent magnet 2 is arranged in this recess, and the main plate 1 is connected to the main plate 1 by using a boss 7 that fixes the rotating shaft 6 to the rotation center of the main plate 1. It is configured to be fixed in place by caulking it together. Further, the impeller has a total sum of the outer surfaces of the arcuate blades 5 smaller than the surface area of the outer peripheral side surface of the impeller, and the number of blades is set to 45.

On the other hand, a plurality of field coils 8 constituting the stator 9 of the motor C are arranged on the inner surface of the casing a facing the permanent magnet 2, and the rotation axis of the impeller is arranged in the center of the field coils 8. A bearing 10 is provided for coupling with the bearing 10. In addition, 1
1 is an air supply port of the casing B, and 12 is a discharge port. Further, FIG. 2 shows a sectional view taken along the line A--A in FIG. 1.

The impeller according to the embodiment of the present application has been described with a configuration in which the outer peripheral end of the main plate 1 is bent outward from the impeller and at the same time the outer peripheral end of the sub-plate 3 is bent outward from the impeller. It goes without saying that the same effect can be obtained by bending the outer peripheral ends of the main plate 1 and the sub-plate 3 in opposite directions.

In the above configuration, when the field coil/L/8 is energized, the permanent magnet 2 integrated with the main plate 1 rotates, the impeller rotates, and the flow from the air supply port 11 to the discharge port 12 is increased. generated and acts as a blower. Here, since the outer peripheral ends of the main plate 1 and the sub-plate 3 are bent, the mechanical strength of the sub-plate 3 can be increased, so that the width of the sub-plate 3 in the radial direction can be further reduced.

That is, the inner/outer diameter ratio DI/D2, which is expressed as the ratio between the inner diameter D1 and the outer diameter D2 of the impeller, can be increased. Furthermore, by making the surface area of the outer surface of the blade 5 smaller than the surface area of the outer peripheral side surface of the impeller d and at the same time arranging a large number of blades 5, an effective flow can be formed on the surface of the blade 5.
Since only a small amount of work is required per stage, pressure fluctuations at the ends of the blades 5 are small and noise generated can be suppressed. In addition, by bending the outer peripheral end of the sub-plate 3 to protrude outward from the impeller, the gap between it and the inner surface of the casing a can be reduced, and the airflow discharged from the impeller can be directed to the air supply port 11. It is possible to suppress the flow that flows backwards. Therefore, there is an effect that the performance as a blower can be further improved.

Effects of the Invention As described above, the impeller of the multi-blade blower of the present invention provides the following effects.

(1) By bending the outer peripheral edge of the sub-plate, the mechanical strength of the sub-plate is increased and a large number of blades with short arc lengths can be provided, which improves the air blowing performance and reduces the It can be made into noise.

(2) If the performance is the same, the impeller can be made smaller and a smaller blower can be made.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an impeller of a multi-blade blower according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line A-A of Figure 9PJI, Fig. 3 is a cross-sectional view showing conventional purchasing, and Fig. 4 The figure is a view taken along line B-B j in FIG. 3. b... Impeller, 1... Main plate, 3...
...Subplate, 4...Inflow port, 5...Blade,
7...Boss. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
-1 main sale 3-1 Liu version 4-first-class entrance S--1 wing 7---Hoss Figure 2 Figure 3

Claims (3)

[Claims] (1) An impeller for a multi-blade blower, which is composed of a main plate having a boss and a sub-plate having a plurality of blades and an air inflow port to the impeller, and in which the outer peripheral end of the sub-plate is bent. (2) An impeller for a multi-blade blower according to claim 1, wherein the outer peripheral end of the sub-plate is bent toward the outside of the impeller. (3) A multi-blade blower according to claim 1 or 2, in which the total area of the outer surface of the blades is smaller than the surface area of the outer peripheral side surface of the impeller, and the number of blades Z is Z≧45. impeller.