JPS639698A - Electric fan - Google Patents

Abstract

PURPOSE:To improve the air speed and air quantity faculty by crossing a core wire which is installed between the inner and outer rings of a front protecting net and forms the protecting net at nearly right angles with the rear edge of a vane. CONSTITUTION:The front surface of a vane 4 is covered with a front protecting net 5, which consists of an outer ring 7, intermediate ring 15, inner ring 8, and core wires 9. The core wires 9 are installed between the inner ring 8 and the intermediate ring 15 and between the intermediate ring 15 and the outer ring 7, and installed so as to cross at nearly right angles with the rear edge 10 of the vane 4. Therefore, the air stream supplied from the vane 4 flows so as to cross a number of core wires 9, and generation of turbulent flow in the vicinity of the front protecting net 5 is eliminated, and the air speed and air quantity faculty can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric fan having a protective net covering the blades.

BACKGROUND OF THE INVENTION Conventionally, electric fans have been constructed as shown in FIGS. 3 and 4.

That is, the electric motor 101 is attached to the stand 103 via the bracket 102, and the shaft 1 of the electric motor 101 is
One blade 105 is attached to 04, and this blade 1
Front protection net 106 and rear protection net 107 to cover 05
is assembled. And the aforementioned front and rear protection nets 106, 107.

Each of them was formed of an outer ring 108, an inner ring 109, and a plurality of core wires 110 provided radially from the inner ring 109 to the outer ring.

In the above configuration, when the electric motor 101 is energized, the blade 1
06 rotates in the direction of the illustrated arrow, sucking air from around the rear protection net 107 and blowing it in the direction of the front protection net 106.

Problems to be Solved by the Invention In such a conventional configuration, the trailing edge 111 of the blade 105
Airflows that are farther away concentrate and collide with each of the radially arranged core wires 110 of the front protection net 106, which tends to cause turbulence in the airflow in the vicinity of the front protection net 106, resulting in an increase in wind speed and volume. The problem was that performance deteriorated and noise increased.

The present invention solves these conventional problems, and aims to provide an electric fan that is less likely to cause turbulence in the airflow near the front protective net, has good wind speed and air volume performance, and has low noise. be.

Means for Solving the Problem In order to solve this problem, the present invention is provided with a blade whose rear end edge is formed in an arc shape, a front protection net and a rear protection net that cover the blade, and a front protection net and a rear protection net. The core wire forming the protective net, which is provided between the inner ring and the outer ring of the net, is arranged to be substantially perpendicular to the rear end edge of the blade.

Function: With this configuration, the core wire intersects the trailing edge of the blade at almost a right angle, so the airflow leaving the blade does not concentrate on the same core wire and collide with it at the same time. It is possible to reduce turbulence in airflow.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in the figure, an electric motor 1 is attached to a stand 3 via a receiving fitting 2, and a blade 4 whose rear end edge 1o is formed in an arc shape is coupled to the rotating shaft of the electric motor 1. The blade 4 is covered with a front protection net 6 and a rear protection net 6. The front protection net 5 has an outer ring 7, a middle ring 15, and an inner ring 8.
The core wire 9 is provided between the inner ring 8 and the middle ring 16, and between the middle ring 15 and the outer ring 7, and is provided so as to intersect the rear end edge 10 of the blade 4 at a substantially right angle.

In the electric fan with the above configuration, when the electric motor 1 is first energized, the blades 4 rotate and suck air from around the rear protective net.
Air is blown in 5 directions of the front protection net. Here, if we take the minute time during which the blades are rotating, we can see that the core line 9 of the front protective net 6 intersects the trailing edge 10 of the blade 4 at almost a right angle, so the airflow away from one blade 4 is simple. Since the flow does not concentrate on one core wire 9 and flows across a large number of core wires 9, turbulence near the front protection net S is reduced, improving wind speed and air volume performance, and reducing noise. can do.

Note that even if the core wire 9 of the front protection net 5 is a rib made of synthetic resin, the effects of improving air volume performance and reducing noise can be achieved.

Effects of the Invention As is clear from the description of the embodiments described above, the present invention provides a method for reducing turbulent flow near the front protection net by attaching the core line of the front protection net so as to intersect with the arcuate rear end edge of the blade at a substantially right angle. It is possible to realize an excellent electric fan that can reduce noise generation, improve wind speed and air volume performance, and reduce noise.

[Brief explanation of drawings]

Fig. 1 is a front view of an electric fan according to an embodiment of the present invention, Fig. 2 is a perspective view of the electric fan as seen from the rear, Fig. 3 is a front view of a conventional electric fan, and Fig. 4 is a perspective view of the electric fan as seen from the rear. It is. 1...Electric motor, 4...Blade, 6...
...Front protection net, 6...Rear protection net, 9...
...Core line, 10...Blade rear end line. Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
-+1 cu

Claims (1)

[Claims] A blade having a rear end edge formed in an arc shape, a front protection net and a rear protection net covering the blade, and a core wire that is provided between the inner ring and the outer ring of the front protection net and forming the protection net is attached to the blade. A fan installed almost perpendicular to the rear edge.