JPS5870099A - Fan - Google Patents

Abstract

PURPOSE:To increase the efficiency of a fan and to lower the noises produced by the same, by providing a plurality of annular bars disposed concentrically with each other and arcuate radial bars connecting the annular bars to each other, and thereby regulating the currents of air and reducing the air-flow loss. CONSTITUTION:A grille 7 fitted to the suction opening of a fan includes a plurality of annular bars 8 disposed concentrically with each other and arcuate radial bars 9 connecting the annular bars 8 to each other. The radial bars 9 are curved in the direction of rotation of a fan 5 (shown by an arrow A in the drawing) so as to convert the air flow forcibly into a current swirling in the direction of rotation of the fan 5 and to pass the air flow through the fan 5 generally in the form of a laminar flow. Thus, generation of turbulences can be prevented. Further merit of shaping the radial bars 9 in an arcuate form is that the bars 9 are prevented from intersecting the end faces of the blades of the fan 5 at a time over the entire length thereof, so that production of noises can be minimized by reducing the whistling sounds.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blower having a grid at its suction port. Generally, the air sucked in from the suction port passes through the fan while changing the direction of the flow in a swirling direction in the rotation direction of the fan. There were some areas where air flow was not carried out, which caused turbulence and reduced ventilation efficiency.

The present invention was made in view of these problems, and its purpose is to provide an air blower with improved air blowing efficiency.

Embodiments of the present invention will be described below using an example of a hair dryer.

Fig. 1 shows the overall structure of the hair dryer, and Fig. 2 shows the structure of the suction port.A fan 5 rotated by a motor 4 is placed inside the main body housing 8, which forms the suction port 1 and the discharge port 2.
A heater 6 is disposed in front of the heater 6, and a suction port grid 7 is provided at the suction port l.

As shown in FIG. 2, the suction port lattice-7 is equipped with a plurality of annular horizontal bars 8 arranged in a Sakakishin circle, and arc-shaped vertical bars 9 that connect the horizontal bars 8 to each other. The vertical bar 9 is curved in the same direction as the rotation direction of the fan 5 (direction of arrow A in FIG. 2), and the arc-shaped vertical bar 9 allows the wind to swirl in the same direction as the rotation of the fan 5. The entire flow becomes laminar, and fan 5
This prevents turbulence from occurring. In addition, by making the vertical bar 9 arc-shaped, when the blade end face of the fan 5 and the vertical bar 9 intersect, the entire length of the blade end face does not intersect with the vertical bar 9 at once, which occurs when the two intersect. This is intended to reduce noise by reducing wind noise. Furthermore, the width of the horizontal bar 8 disposed on the outer periphery of the suction port 1 (dimension a in Figure 1) is made smaller than the width of the horizontal bar 8 disposed in the center (dimension A in Figure 1). There is. This is because the air sucked in from the center of the suction port 1 is drawn parallel to the horizontal bar 8, as shown by the arrow in FIG. For this reason, if the width of the horizontal bar 8 on the outer periphery is large, the bar acts to obstruct the flow of wind.

As described above, the present invention provides a blower in which a fan rotated by a motor is disposed facing a suction port in a main body housing, and a plurality of annular horizontal bars arranged concentrically and an arc shape connecting the horizontal bars to each other. Since the vertical beam is provided at the suction port, the air flow is rectified, eliminating air blowing loss and improving the air blowing efficiency, and the wind noise generated when the end face of the fan blade intersects the suction port grid is also reduced. The noise can be reduced by

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a hair dryer employing the present invention, and FIG. 2 is a front view of the same from the suction port side. 1. Suction port, 3. Main body housing, 4. Motor,
5 fists, 7 ans, 7, working suction port lattice, 8...horizontal beam, 9@...
Vertical bar. Patent applicant Matsushita Electric Works Co., Ltd. Representative patent attorney Toshimaru Takemoto (and 2 others)

Claims (1)

[Scope of Claims] 1) In a blower in which a fan rotated by a motor is disposed facing a suction port in a main body housing, a plurality of annular horizontal bars arranged concentrically and the horizontal bars are connected to each other. A blower characterized in that the suction port is provided with an arc-shaped vertical bar. 2) The blower according to claim 1, wherein the width of the horizontal bar disposed on the outer periphery of the suction port is smaller than the width of the horizontal bar disposed in the center.