JPS5844298A - Blower - Google Patents

Abstract

PURPOSE:To maintain the normal flow of wind and permit quiet ventilation by forming a plurality of through holes which penetrate a hub from its outer surface to the inner surface over the whole cylindrical surface of the hub and installing an internal propeller fan inside the hub. CONSTITUTION:When a vane wheel 1 is revolved by operating a motor 9, air flows towards the front surface side A of the vane wheel 1 from the rear surface side B as shown by the arrow F in the drawing. The air in the vicinity of the hub 2 is inhaled into the inside of the hub 2, passing through the through holes 3, by the internal propeller fan 8 installed in the hub 2, as shown by the arrow G. When the static pressure increases, the air stream F tends to flow radially to the outside, but the flow G of the air which passes through the through holes 3 and the internal propeller fan 8 and is inhaled into the inside of the hub 2 increases because of the differential static pressure, and the flow to the outside and the flow in G direction are balanced, so the flow perpendicular to a shaft is not generated, and the normal flow in F direction is maintained. Thus, the smooth characteristic of the noise level is obtained, 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 10 around the outer periphery of a cylindrical hub 101, as shown in FIGS. 6 to 9.
2 is arranged to constitute the impeller 10B, and inside the hub 1o1 there is a boss 105 that engages with the rotating shaft 104 of the electric motor 1030.
and a screw 106 for fixing the rotation shaft 104 to the boss 1051C, and the screw 10 of the hub 101
A 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 B 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 arrow X in FIG. The air flowing in from the windward side of the blade 101 causes separation from the circumferential portion of the blade 101 and flows in a direction approximately perpendicular to the rotating shaft 104 of the electric motor 1030. Also, induced by this flow, the air flows into the impeller. Air also flows from the leeward side of 108 as shown by arrow Z in FIG. 8, which is thought to increase noise.

The present invention has been made in view of this point, and includes a through hole penetrating from the outer surface of the blade to the inner surface on the leeward side of the nose of the impeller and on the cylindrical surface parallel to the axis of the propeller-type impeller. By providing this, the above-mentioned conventional problems are attempted to be solved.

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. Reference numeral 3 denotes a plurality of holes arranged substantially evenly 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, the cylindrical surface 2b of the hub 2 so as to penetrate from the outside to the inside. An air passage 4 is formed between the front side and the rear side of the impeller 1 by the through holes 3. 6 is a plurality of blades arranged radially around the knob 2; 6 is a boss provided inside the knob 2; and 7 is a partition wall that partitions the through hole 3.

Reference numeral 8 denotes an internal propeller fan that also serves as a reinforcing lip that connects the inner surface of the nozzle 1 and the outer surface of the boss 6, and when the impeller 1 is rotated, the direction of the air flowed by the blades 6 is opposite to that of the propeller fan 8. The air passage 4 is formed so that air flows in the direction of the air passage 4, and constitutes an auxiliary ventilation means. Further, 9 is the impeller 1
This is a screw hole for a screw (not shown) that is fitted and fixed to the motor 1o via the boss 6.

In the above configuration, the air guider 11 is combined with the outer periphery of the impeller 1 to form an impeller-type blower device, and when the impeller 1 is rotated by the motor 9, the impeller 1 moves from the rear side B to the front side A. As shown by arrow F in FIG. 2, air flows as in the conventional example. Furthermore, the internal propeller fan 8 provided inside the knob 2 allows the air near the knob 2 to flow into the interior of the knob 2 through the through hole 1 as shown by arrow G in FIG. 3.For this reason, the air volume when the static pressure is zero is slightly smaller than the static pressure of the conventional impeller-type blower device, and the air volume when the static pressure is zero, but the air volume and static pressure when the contact pressure increases are The pressure relationship does not change significantly and is not a problem in practice.When the static pressure increases, the air flow F tends to flow radially outward. and the internal propeller fan 8
The flow G of the air flowing into the nozzle 2 increases, and the outward flow and the flow in the G direction balance each other out, so that no flow occurs perpendicular to the axis and the air flows in the direction of the arrow F. Normal flow is maintained. As a result, the noise level also has a gentle characteristic as shown in Figure 3, 13, and there is no sudden rise as seen in the characteristic 14 of conventional propeller fans, and the noise level suddenly increases due to various or fluctuating loads. It becomes possible to perform quiet air blowing without rising.

It is also conceivable to construct an auxiliary air blowing means by forming the partition wall 7 itself into the shape of a centripetal fan 7a as shown in another embodiment of FIG. 4, and the same effect can be obtained.

In addition, what is shown in FIG. 6 is a fan 1 which is an auxiliary ventilation means.
6 is provided in the motor 16, thereby obtaining air flow in the opposite direction to the main blowing direction (in the direction of arrow H in FIG. 6).

17 is a knob having a through hole 18.

As described above with reference to each embodiment, the blower device of the present invention includes an impeller having a plurality of blades radially around a cylindrical nozzle with a closed front, and a rotary drive to drive the impeller. Consisting of a motor and an air guider provided on the outer periphery of the impeller, a plurality of through holes are formed on the cylindrical surface of the knob on the leeward side in the air blowing direction and penetrate into the hub almost uniformly over the entire circumference. An air passage is provided that communicates the side of the impeller with the rear side of the impeller, or an auxiliary air blowing means for sending air in a direction opposite to the air blowing direction as described above is provided in this air passage. Axial plowing prevents the generation of perpendicular airflow when static pressure increases, eliminates the sudden rise in noise level that occurs, and provides quiet ventilation for various or fluctuating loads. It made it possible.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an impeller in an embodiment of the present invention, Fig. 2 is a side view of a blower device in an embodiment of the present invention, and Fig. 3 shows the air volume and noise level of the blower device. Characteristic diagram, Fig. 4 is a cross-sectional view of another embodiment of the present invention when the partition wall of the perforated hole is used as a centripetal fan, and Fig. 5 is a cross-sectional view of the air blower according to yet another embodiment of the present invention. A cross-sectional view of the device, Figure 6 is a front view of a conventional blower impeller, Figure 7 is a cross-sectional view taken along line 5g in Figure 5, and Figures 8 and 9 are a front view of a conventional blower impeller. FIG. 1...1 impeller, 2,17... ・Knob 1 knob 318
...Through hole, 4...Air passage, 6...
...Blade, 8...Internal Grobera fan (auxiliary ventilation means). Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4 Air volume 1a6 Figure Crane 7 Figure 1θθ105

Claims (4)

[Claims] (1) An impeller having a plurality of blades radially around a cylindrical hub with a closed front, a motor that rotationally drives the impeller, and an air guy provided on the outer periphery of the impeller;
A plurality of through holes are formed in the cylindrical surface on the leeward side of the hub in the air blowing direction and penetrate into the hub almost uniformly over the entire circumference, and the air passage communicates the front side of the impeller with the rear side of the impeller. Air blower equipped with (2) Consisting of an impeller having a plurality of blades radially around 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 are formed in the cylindrical surface on the leeward side of the hub in the air blowing direction, penetrating into the hub almost uniformly over the entire circumference, and an air passage is provided that communicates the front side of the impeller with the rear side of the impeller. A blower device comprising an auxiliary blower for sending air in an air path in a direction opposite to the blowing direction by the blades. (3) The air blowing device according to claim 1, wherein an auxiliary air blowing means is provided integrally with the hub. (4) The blowing device according to claim 3, wherein the auxiliary blowing means is constituted by a plurality of internal propeller fans that also serve as reinforcing lips of the cylindrical hub.