JPS638328Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a hair dryer, and is designed to prevent wind noise from being generated by the air taken in from the outside air auxiliary intake hole provided on the rear wall of the main body case. This is what I did.

(Prior art) A heater and a motor are housed inside a cylindrical main body case, and a fan is arranged facing an outside air intake port opened at the rear end, and outside air is sucked through the outside air intake port. In a hair dryer that blows out warm air from an outlet formed at the front end, in order to increase the air volume, an auxiliary outside air intake hole is formed on the rear wall of the main body case, and outside air is also sucked through the intake hole. It is known to do.

(Problem to be solved by the invention) However, when the outside air suction hole is formed in the rear wall of the main body case as described above, the outside air sucked through the suction hole flows from the outer circumferential side of the fan toward its axis. Because the vehicle tries to travel straight in the radial direction, the fan generates loud wind noise, increasing noise.
In addition, there was a problem that the load on the fan increased and the efficiency of the fan decreased.

(Means for Solving the Problems) In order to solve the above problems, the present invention houses a heater 7 and a motor 2 in a cylindrical main body case 1, and a fan 3 driven by the motor 2 is attached to the main body. Outside air intake port 13 opened at the rear end of case 1
In the hair dryer, the air taken in from the outside air intake port 13 is directed straight in the axial direction of the fan 3 and is blown out from the air outlet 18 at the front end. A plurality of outside air auxiliary intake holes 10 are arranged in parallel,
A fan casing 9 is provided inside the main body case 1 at a distance G to cover the outer periphery of the fan 3,
The rear end portion of the fan casing 9 is made to extend a distance L rearward from the outside air auxiliary suction hole 10 formed at the frontmost position.

(Operation and Effect) According to the above configuration, outside air is sucked in through the outside air intake port 13 at the rear end of the main body case 1 and the outside air auxiliary intake hole 10 on the rear wall surface when the fan 3 is driven.
The outside air taken in from the outside air auxiliary suction hole 10 is prevented from traveling straight in the radial direction from the outer circumferential side of the fan 3 toward the axis by the fan casing 9, and bypasses the rear end of the casing 9 to reach the fan 3. Since suction is taken from the rear side in the axial direction, wind noise will not be generated even if the fan 3 rotates at high speed, and the load on the fan 3 will not increase unduly, so it is quiet. Moreover, you can get a high-power hair dryer with a large air volume.

(Example) Next, an example of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a cylindrical main body case made of synthetic resin and divided into front and rear halves, and a small DC type motor 2 for driving a fan 3 is disposed inside the case. 13 is main case 1
An outside air intake port is provided at the rear end, 11 is an intake port guard made of wire mesh, 18 is an air outlet provided at the front end of the air intake port, and 12 is an air outlet grill. It is well arranged. 4 is a motor support plate formed from a metal plate,
The motor 2 is supported via a holder 5. A plurality of heater boards 6 are arranged around the motor 2 and supported by a holder 5, and a heater 7 made of a heater wire is wound around the outer periphery of the heater board 6. A heat shield plate 8 is lined on the inner surface of the main body case 1 over almost the entire length around which the heater 7 is wound.

Reference numeral 9 denotes a fan casing that is integrally molded with the main body case 1, and is formed so as to cover the outer circumference of the fan 3 at an appropriate distance G from the main body case 1, and its rear end is approximately in contact with the rear end surface of the fan 3. Match. Reference numeral 10 denotes a large number of outside air auxiliary intake holes arranged in parallel on the rear wall surface of the main body case 1, and the rear end of the fan casing 9 is located at a distance L from the outside air auxiliary intake hole 10 formed furthest forward (on the outlet 18 side). It extends rearward (see also Figure 2). Reference numeral 14 denotes a wiring board on which electrical components of the heating device such as a thermostat 15 and a diode 16 are arranged, and is connected to the heater section through a terminal 19. Reference numeral 20 denotes noise prevention elements attached to the rear of the motor 2. 17 is a handle attached to the lower part of the main body, and a switch 21 and the like are housed therein.

This hair dryer has the above-mentioned configuration, and as the fan 3 rotates, the air sucked in from the outside air intake port 13 travels straight in the axial direction of the fan 3, is heated by the heater 7, becomes hot air, and is discharged from the air outlet 18. Speech out. In addition, the air sucked in from the outside air auxiliary suction hole 10 bypasses the rear end of the fan casing 9, is sucked in from the rear side of the fan 3 in the axial direction (see the broken arrow in FIG. 2), and is heated by the heater 7. The air is blown out from the air outlet 18. By the way, if there is no fan casing 9 configured as described above,
The air taken in from the outside air auxiliary suction hole 10 travels straight in the radial direction from the outer circumference of the fan 3 toward its axis as shown by the chain arrow, and the fan 3 generates a large wind noise. It happens. However, by configuring the fan casing 9 as described above, the air taken in from the outside air auxiliary suction hole 10 bypasses the rear end and is taken in in the axial direction of the fan 3, as shown by the broken line arrow. Large wind noise will not be generated, and the load on the fan 3 will not become unduly large and the air volume will not decrease.

[Brief explanation of the drawing]

The figure shows an embodiment of the present invention.
The figure is a sectional view, and FIG. 2 is a partial sectional view. 1...Body case, 3...Fan, 6...Motor, 7...Heater, 9...Fan casing, 1
0... Outside air auxiliary intake hole, 13... Outside air intake port, 1
8...Air outlet.

Claims (1)

[Scope of utility model registration request] A heater 7 and a motor 2 are housed in a cylindrical main body case 1, and a fan 3 driven by the motor 2 is arranged facing an outside air intake port 13 opened at the rear end of the main body case 1. In this hair dryer, air taken in from an outside air intake port 13 is made to advance straight in the axial direction of the fan 3 and is blown out from an air outlet 18 at the front end. A fan casing 9 is arranged in parallel and covers the outer periphery of the fan 3 at a distance G inward of the main body case 1.
A hair dryer characterized in that the rear end of the fan casing 9 extends a distance L behind the outside air auxiliary suction hole 10 formed at the frontmost position.