JPH0431686B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in the structure of a fan storage portion of a hair dryer.

[Prior art]

In recent years, hair dryers have tended to have higher power, and accordingly, the noise has also become louder. In particular, this type whose main body outer shell is cylindrical,
In general, axial flow fans such as propeller fans are often used, and as a result, the number of rotations is inevitably high and the noise is large, so a quiet, high-power hair dryer has been desired.

[Purpose of the invention]

An object of the present invention is to provide a hair dryer with reduced noise.

[Summary of the invention]

The present invention is characterized by a cylindrical main body outer shell with an intake port at the rear and an outlet at the front;
The hair dryer is equipped with a heater on the outlet side of the main body and an axial fan rotated by a motor on the intake port side of the main body, the outer diameter of the axial fan being 80% larger than the inner diameter of the outer shell of the main body. % or less, and a fan guide formed in a double wall whose upper end surface almost coincides with the position of the lower end surface of the axial flow fan and extends toward the air outlet side is disposed inside the main body outer shell. , between the fan guide and the axial fan〓
There is a hair dryer with a slight formation.

[Embodiments of the Invention] The present invention has been made in view of the above points, and embodiments will be described below with reference to the drawings.

Reference numeral 1 denotes the main body outer shell, which is made of synthetic resin and is divided into front and rear halves, and a heating device, a blower device, etc. are housed inside. 2 is a small direct current type motor, and an axial fan 3 is fixed to the output shaft. Reference numeral 4 denotes a motor support plate formed of a metal plate, which is sandwiched between the front and rear body shells 1 and supports the motor 2 via a holder 5.

A plurality of heater boards 6 are arranged around the motor 2 and supported by a holder 5. A heater wire 7 is wound around the outer periphery of the heater board 6. Reference numeral 8 denotes a heat shield plate, which is lined on the outer shell 1 of the main body over almost the entire length around which the heater wire 7 is wound.

Reference numeral 9 denotes a fan guide molded integrally with the main body outer shell 1. Its upper surface is almost flush with the lower end surface of the axial flow fan 3, and the inner diameter of the fan guide 9 is approximately larger than the outer diameter of the axial flow fan 3. It is 1-2mm larger. Further, the outer diameter of the axial fan 3 is set to be 80% or less of the inner diameter of the outer shell 1 of the main body, and in this embodiment, the outer diameter of the fan is 55 mm and the inner diameter of the outer shell of the main body is 70 mm.

Reference numeral 13 denotes an intake port, and an intake port guard 11 made of wire mesh or the like is attached thereto. Reference numeral 12 denotes an outlet grille fitted to the outlet 18. Reference numeral 14 denotes a wiring board on which electrical components necessary for the heating device, such as a thermostat 15 and a diode, are arranged, and is connected to the heater part through a terminal 19. 20 is a noise prevention element attached to the rear of the motor 2. Reference numeral 17 denotes a handle attached to the lower part of the main body, in which a switch 21 and the like are housed.

With the above configuration, the above-mentioned embodiment of the present invention has the following functions and effects.

(1) The outer diameter of the axial flow fan is 80% relative to the inner diameter of the outer shell of the main body.
% or less, the outer periphery of the fan is opened, so there is no frictional vortex flow between the fan and the fan guide, and vortex noise is reduced.

(2) By aligning the top surface of the fan guide with the bottom end surface of the fan and minimizing the gap G between the fan guide and the fan, a rectifying effect is produced, and vortex noise is reduced without extremely reducing the air volume and wind pressure.

〔Effect of the invention〕

According to the present invention, the eddy current around the fan is reduced and the air flow becomes smooth, so it is possible to provide a hair dryer with low noise despite its high power.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hair dryer showing one embodiment of the present invention. 1... Main body outer shell, 3... Axial flow fan, 9... Fan guide.

Claims (1)

[Claims] 1. A cylindrical main body shell with an intake port at the rear and an air outlet at the front, a heater arranged inside the main body shell on the side of the air outlet, and an axial flow fan rotated by a motor on the side of the air intake port. It's a hair dryer,
The outer diameter of the above axial fan is relative to the inner diameter of the outer shell of the above body.
80% or less, and a fan guide formed in a double wall whose upper end surface almost coincides with the position of the lower end surface of the axial flow fan and extends toward the air outlet side is arranged inside the main body outer shell. A hair dryer characterized in that a slight space is formed between the fan guide and the axial fan.