JPS63285294A - Multiblade blower - Google Patents

Abstract

PURPOSE:To improve the extent of blowing capacity by having a permanent magnet opposed to a field coil via a substrate of a stator, making an impeller smaller in the sum total of areas of its blade outer surface than a surface area of the impeller peripheral side, and setting the number of blades down to more than 45 pieces. CONSTITUTION:In this blower, there are provided with field coils 11 which constitutes a rotator 8 in setting up a permanent magnet 2 inward a main plate 1 and an impeller (b) and also constitutes a stator 10 on an inner surface of a casting (a) to be opposed to the permanent magnet 2. The impeller (b) is made smaller in the sum total of outer surfaces of a circular blade 5 than a surface area of the peripheral side of the impeller (b), and the number of blades is set down to more than 45 pieces. With this constitution, blowing capacity is improved and, what is more, the promotion of low noise is contrivable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an impeller for a multi-blade blower used in combustion equipment and the like.

BACKGROUND OF THE INVENTION Conventionally, as shown in FIGS. 6 and 7, the impeller d of a multi-blade blower has a blade having an arcuate cross section between a main plate 1 and a sub-plate 3 having an air inlet 4 in the center. 2 are arranged parallel to the rotation axis, and are placed inside the spiral casing 5, and at the same time are rotated by a motor 6 fixed outside the casing 5 for use. In addition, the impeller d has the main plate 1
The secondary plate 3 was molded onto a flat plate, the arc length of the blade 2 was increased, 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. 7 shows a sectional view taken along the line B--B in FIG. 6.

In FIGS. 6 and 7, the impeller d is rotated by driving the motor 6, and a flow is generated from the air supply lower provided in the casing 5 to the discharge port 8, thereby operating as a blower.

Problems to be Solved by the Invention However, when the configuration shown in FIGS. 6 and 7 is used, the motor 6 is fixed outside the casing 5, which has the disadvantage of increasing the size of the blower. In order to solve this problem, conventionally, as shown in FIG.
It was configured to be located inside the. However, the eighth
In the configuration shown in the figure, since the air flow path inside the impeller d is significantly narrowed by the motor 6, there is a problem in that the air resistance increases and the performance of the blower is significantly reduced.

The present invention solves these conventional problems,
It is possible to provide an impeller for a multi-blade blower that reduces the size of the blower without increasing the air resistance inside the impeller.

Means for Solving the Problems In order to solve the above problems, the present invention provides a rotor structure in which permanent magnets are integrally arranged on a substrate that constitutes a stator by laminating field coils, and a main plate. A blower is constituted by an impeller, a rotating shaft serving as the center of rotation of the rotor, and a bearing supporting the rotating shaft, and the field coil is exposed to a closed space, and the permanent magnet is connected to the permanent magnet via the substrate. is opposed to the field coil, and the total area of the outer surface of the impeller is smaller than the surface area of the outer peripheral side of the impeller, and the number of blades is 2, 2≧
45.

Function The present invention can greatly suppress the increase in air resistance inside the impeller and at the same time improve the air blowing performance of the impeller itself, so that the blower can be made thinner and smaller. .

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 casing 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 main plate 1 is recessed inward of the impeller, and the permanent magnet 2 is arranged in this recess to constitute the rotor 8 of the motor C. Using the fixing boss 7, attach the main plate 1.
The structure is such that it is integrally caulked and fixed. Furthermore, the impeller has arc-shaped blades 5 from the surface area of the outer peripheral side of the impeller.
The total outer surface is made smaller, and the number of wings is set to 45.

On the other hand, on the inner surface of the casing a facing the permanent magnet 2, a plurality of field coils 11 constituting the stator 10 of the motor C are stacked on a substrate 12, and at the same time, a substrate is placed between the field coil 11 and the permanent magnet 2. 12 is positioned so that the field coil 11 faces the space 15 closed by the substrate 12 and the inner surface of the casing a, and a bearing 9 that receives the rotating shaft 6 of the impeller is located at the center of the field coils 11. has been established. In addition,
Reference numeral 13 indicates an air supply port of the casing a, and 14 also indicates a discharge port. Further, FIG. 2 shows a sectional view taken along the line A--A in FIG. 1. Furthermore, Fig. 3 is a perspective view of the impeller seen from the main plate 1 side, and especially when a divided magnet is used as the permanent magnet 2, Fig. 4 is a perspective view of the impeller when a divided magnet is used as the permanent magnet 2. This is a case in point. Further, FIG. 5 shows a configuration in which a bearing 9 is provided on the main plate 1 of the impeller and a rotating shaft 6 is arranged on the stator 10.

In the above configuration, when the field coil 11 is energized, the permanent magnet 2 integrated with the main plate 1 rotates, causing the impeller to rotate, creating a flow from the air supply port 13 to the discharge port 14, which acts as a blower. Operate.

At this time, since the impeller acts as the rotor 8 of the motor C, the motor C is built into the casing a, which has the effect that the entire blower can be made smaller. Also,
To make the surface area of the outer surface of the blade 5 smaller than the surface area of the outer circumferential side surface of the impeller, and at the same time, increase the number of blades 5 to 45 or more;
That is, by providing a large number of blades 5 with short arc lengths, an effective flow is formed on the surface of the blades 5, and the work per blade is small, so pressure fluctuations at the ends of the blades 5 are small. This has the effect of suppressing the generated noise. Further, the field coil 11 is connected to the closed space 1'5.
By facing the field coil 11, foreign matter can be prevented from adhering to the field coil 11, and damage to the field coil 11 can be prevented.

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

(1) By making the total area of the outer surface of the blades smaller than the surface area of the outer circumferential side of the impeller and setting the number of blades to 45 or more, the air blowing performance can be improved and noise can be reduced.

(2) By integrally configuring the permanent magnet and the main plate of the impeller, the blower can be made thinner, and at the same time, the moment of inertia of the impeller increases, so the influence of blower load fluctuations can be reduced. .

(3) By placing the field coil facing a closed space,
It is possible to prevent foreign matter from adhering to the field coil, and damage to the field coil can be prevented.

(4) By providing a concave part in the main plate inward of the impeller and arranging a permanent magnet in this concave part, the thickness of the rotating part can be made thinner, and the fixing strength of the permanent magnet against centrifugal force can be increased. Can be done.

(5) By configuring the permanent magnet as a single ring-shaped magnet, it is possible to increase the fixing strength compared to split magnets, and at the same time,
It is possible to effectively balance the rotation of the impeller.

(6) By sandwiching and fixing the permanent magnet between the boss and the main plate, the fixing strength of the magnet can be increased.

(7) By providing a bearing on the main plate of the impeller, it is possible to suppress vibration of the impeller with respect to the rotating shaft, and it is also possible to use a rotating shaft and bearing with a large diameter, which extends the life of the bearing part. I can figure it out.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a multi-blade blower according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a perspective view showing the configuration of the same impeller, and Fig. 4 is a perspective view of the impeller of the embodiment at the same site, FIG. 5 is a sectional view of a multi-blade blower in another embodiment, FIG. 6 is a sectional view showing the conventional configuration, and FIG. 7 is B of FIG. 6. 8 is a sectional view showing another conventional example. b... Impeller, 1... Main plate, 2...
...Permanent magnet, 6...Rotating shaft, 7...
・Boss, 8...rotor, 9...bearing,
10...Stator, 11...Field coil, 12...Substrate. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
--Main version? ---Eternal confusion 1 6-IB*Old- 11-11-Kai Eihen Koi) / 2-Kiboard Fig. 1 b-Hao-kuruma l-Ma Fig. 2 Fig. 3 Me Fig. 4 Fig. 5 Figure 6 Figure 7 Figure 8

Claims (5)

[Claims] (1) A substrate that constitutes a stator by laminating field coils,
A blower is composed of an impeller that constitutes a rotor by integrally disposing a permanent magnet on the main plate, a rotating shaft that is the center of rotation of the rotor, and a bearing that supports the rotating shaft, and the field coil is closed. At the same time, the permanent magnet is made to face the field coil via the substrate, and the total area of the outer surface of the circular arc blades is made smaller than the surface area of the outer peripheral side of the impeller, and the number of blades is A multi-blade blower where Z is Z≧45. (2) A multi-blade blower according to claim 1, wherein the rotating shaft is fixed to the rotor via a boss, and the bearing is fixed to the stator. (3) A multi-blade blower according to claim 1, wherein the rotating shaft is fixed to the stator via a boss, and the bearing is fixed to the rotor. (4) Providing a concave part inward of the impeller main plate,
A multi-blade blower according to claim 1, 2 or 3, wherein a permanent magnet is arranged in the recess. (5) A multi-blade blower according to claim 1, 2 or 3, wherein the permanent magnet is a ring-shaped single magnet.