JPS5844297A - Blower - Google Patents

Abstract

PURPOSE:To maintain the normal flow of wind and reduce noise by forming a plurality of through-holes which penetrate the inside of a hub at almost equal intervals on the whole periphery of the cylindrical surface of the hub and forming the air passage which communicates with the front and the rear surface sides of a vane wheel and allowing the partition wall between through holes to be used as partition vanes. CONSTITUTION:When a vane wheel 1 is revolved by a motor 9, air flows as shown by the arrow F in the drawing towards the front surface side A from the rear surface side B of the vane wheel 1, and the air in the vicinity of a hub 2 is inhaled into the hub 2 from the through holes 3 as shown by the arrow G, by the centrifugal fan formed as partition vanes 7, from the partition walls in a plural number of through holes 3 which are formed at almost equal intervals on the whole periphery so as to pentrate the cylindrical surface of the hub 2 from its outside to the inside. When the static pressure increases, air tends to flow F outward radially, and the flow to the outside and the flow in G direction are balanced, and the flow in the perpendicular direction to an axis is not formed, and the normal flow in the direction of arrow F is maintained. As a result, the smooth characteristic of noise level is obtained, so as to achieve a quiet ventilation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blower device used in an air conditioner or the like, and is particularly aimed at suppressing noise generated from an impeller.

Conventionally, a blower device using an impeller has a plurality of blades 1 around the outer periphery of a cylindrical nozzle 101, as shown in FIGS. 6 to 9.
02 to constitute an impeller 10B, and a rotating shaft 104 of an electric motor 103 and several bosses 10 are disposed inside the hub 101.
6, and a screw 106 for fixing the rotary shaft 104 to the boss 106 is provided, and the screw 106 of the hub 101
One small diameter hole 107 for tightening the screw 106 is provided at a position opposite to the screw 106, and an air guider 109 is further provided.

In such a configuration, it is widely known that when the atmospheric pressure difference between the front side A and the rear side 1IIIB of the impeller 108 exceeds a predetermined value, noise increases rapidly.

In other words, the difference in atmospheric pressure between the front side A and the rear side B of the impeller (
When the static pressure (hereinafter referred to as static pressure) is below a predetermined value, the air flows in the direction shown by the arrow X in FIG. Air flowing in from the windward side causes separation from the circumferential portion of the hub 101 and flows in a direction approximately perpendicular to the rotating shaft 104 of the electric motor 103. Also, induced by this flow, air flows to the leeward side of the blade tun 108. Air also flows from the sides as shown by arrow 2 in Figure 8, which is thought to increase noise.

The present invention has been made in view of this point and aims to solve the above-mentioned conventional problems.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the figure, 1 is an impeller, and 2 is a cylindrical hub with a closed front surface 2a. Numerals 3 are arranged almost uniformly over the entire circumference of the hub 2 on the leeward side and parallel to the axis of the propeller-type impeller 1, that is, on the cylindrical surface 2b of the hub 2 so as to penetrate from the outside to the inside. A plurality of through holes 3 form an air passage 4 between the front side and the rear side of the impeller 1. 5 is a plurality of blades arranged radially around the hole 2, 6 is a boss provided inside the hole 2, and 7 also serves as a partition wall that partitions the through hole 3. It is a partition blade.

The partition blades 7 constitute a centripetal fan so that air flows through the air passage 4 in the opposite direction to the direction of air flowed by the blades 6 when the impeller 1 is rotated.

In the above configuration, an air guider 8 is arranged around the outer periphery of the impeller 1, and when the impeller 1 is rotated by the electric motor 9, the impeller 1 is moved from the rear side B to the front side A as shown by arrow 2 in FIG. As in the case of the conventional example, air flows. moreover,
The partition blade 7 provided on the hub 2 allows the hub 2 to
Nearby air is forced into the interior of the pipe 2 through the through hole 3 as shown by the arrow 2 in FIG. Therefore, the air volume when the static pressure is zero is slightly smaller than the air volume when the static pressure is zero in the conventional impeller type blower, but the air volume and static pressure relationship does not change significantly when the static pressure increases. There is no problem in practice.

When the static pressure increases, the air flow F tends to flow radially outward, but on the other hand, due to the static pressure difference, the air flow is sucked into the through hole 3 and the partition blade 7 into the pipe 2. G increases, and the outward flow and the flow in the direction of the arrow G are balanced, and no flow in the direction perpendicular to the axis occurs, and a normal flow in the direction of the arrow F is maintained. For this reason, the noise level also has a smooth vC characteristic as shown in Figure 4, and there is no sudden rise as seen in characteristic 11 of conventional propeller fans, and the noise rises suddenly due to various or fluctuating loads. This makes it possible to blow air quietly without any problems.

As described above with reference to the embodiments, the blower device of the present invention has a plurality of through holes that penetrate into the inside of the cylindrical surface of the cylindrical I\b that supports the blades, approximately evenly distributed over the entire circumference on the leeward side of the cylindrical surface of the cylindrical surface in the blowing direction. A centripetal fan is formed by forming an air passage that communicates the front side of the impeller with the rear side of the impeller, and using the partition wall between the through holes as partition blades.This reduces the manufacturing cost of the impeller. It prevents the occurrence of air flow in the direction perpendicular to the impeller axis without significantly increasing the noise level, eliminates the sudden increase in the noise level that occurs, and makes it possible to handle various or fluctuating loads. This allows for quiet ventilation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an impeller according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line 14 in FIG. The figure is a characteristic diagram showing the relationship between noise and air volume of the blower, Figure 6 is a front view of a conventional blower impeller, Figure 6 is a cross-sectional view taken along line W-W in Figure 6, and Figure 7
8 and 8 are side views of a blower device using the same blower impeller. 1...Blade L 2...Knob 1, 3--
...Toru JL. 4... Air path, 6... Vane, 7...
...Partition blade. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 13 Figure 4 Lice l

Claims (1)

[Claims] It consists of an impeller with a plurality of blades radially surrounding a cylindrical hub with a closed front, a motor that rotationally drives this impeller, and an air guider provided on the outer periphery of the impeller,
A plurality of through holes penetrating into the hub are formed at substantially equal intervals over the entire circumference on the full cylindrical surface of the hub in the wind blowing direction, and an air passage is provided that communicates the front side of the impeller with the rear side of the impeller. . An air blowing device in which a centripetal fan is formed in which a partition wall between the through holes causes air to flow in a direction opposite to the blowing direction of the impeller.