JPS638329Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a hair dryer, and in particular to an improvement in ventilation passages for noise reduction.

(Conventional example) As a hair dryer, for example,
As shown in Japanese Patent No. 25312, a cylindrical body case is known in which an air outlet and an inlet are formed at the front and rear ends, and a heater, motor, fan, etc. are housed in the middle part.

This type of hair dryer is desired to be quiet and have high power, and for this purpose, the air sucked in from the suction port must be blown out smoothly from the outlet.

(Problem to be solved by the invention) However, in the conventional device described above, the inner diameter of the air outlet was smaller than the inner diameter of the suction port, and the air outlet was constricted, so the allowable amount of air to blow out was smaller than the intake amount. This caused problems such as the flow velocity at the outlet becoming abnormally high and the ventilation loss becoming large, causing turbulence and vortices in the airflow inside the main body case, resulting in tremendous noise and extremely heavy load on the fan. .

(Means for Solving the Problems) The present invention aims to improve the ventilation passage within the main body case and reduce noise and fan load. To this end, the present invention forms an air outlet 18 and an inlet 13 at the front and rear ends of the cylindrical main body case 1, and a heater 7 and a motor at an intermediate portion between the air outlet 18 and the inlet 13. 2, a fan guide 9 disposed around the outer periphery of a fan 3 disposed at the rear of the motor 2;
The inner diameter D2 of the air outlet 18 is made equal to the inner diameter D1 of the air outlet 18, and the maximum inner diameter D3 of the intermediate portion is made larger than each of the inner diameters D1 and D2.

(Operation and Effect) According to the above configuration, since the inner diameters D1 and D2 of the air outlet 18 and the fan guide 9 are made equal, the suction amount and the blowing amount become equal, and the air flow inside the main body case 1 becomes smooth. This can prevent noise caused by turbulent airflow. In addition, the effective ventilation area of the intermediate part where the heater and motor are arranged becomes small due to the presence of the heater and motor, but by increasing the inner diameter D3, a sufficient ventilation area can be secured, and the air is sucked in from the suction port 13. The air can flow smoothly toward the outlet 18. At this time, by increasing the inner diameter D3 of the intermediate portion, the suction port 13
The flow velocity temporarily decreases in the middle, increasing the contact time with the heater, that is, the heat transfer time, improving heat transfer efficiency, and reducing wind noise due to turbulent flow and eddies that occur downstream of the heater and motor. This can be reduced. As described above, according to the present invention, the suction port 1
Since the air sucked in from the main body case 1 flows smoothly through the main body case 1 and is blown out from the air outlet 18, a quiet, high-power hair dryer with low noise and fan load can be obtained.

(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 has an air outlet 18 and an inlet 13 at its front and rear ends. Reference numeral 12 denotes an outlet grill fitted to the outlet 18, and 13 an inlet guard made of a wire mesh or the like attached to the inlet 13. A small DC type motor 2 is installed between the outlet 18 and the intake port 13.
A fan 3 is installed at the rear of the motor 2. 4 is a motor support plate formed from a metal plate,
It is held between the front and rear main body cases 1 and supports the motor 2 via a holder 5. 6 is a heater bobbin, and a heater 7 is wound around the outer periphery of the heater bobbin.

Reference numeral 9 denotes a fan guide provided on the outer periphery of the fan 3, which is integrally molded with the main body case 1.
The rear end portion almost coincides with the front end surface of the fan 3, and its inner diameter D2 is 1 larger than the outer diameter of the fan 3.
It has grown ~2mm. A wiring board 14 is provided with a thermostat 15, a diode, etc., and is connected to the heater 7 through a terminal 19.
20 is a noise prevention element attached to the rear part of the motor 2, 17 is a handle, and a switch 21 and the like are provided. The inner diameter D1 of the air outlet 18 and the inner diameter D2 of the fan guide 9 are approximately the same diameter, and the maximum inner diameter D3 of the intermediate portion is equal to the inner diameter D1, D2 of the fan guide 9.
greater than 2 (D1, D2 are 80% or less of D3),
In this embodiment, the fan has an outer diameter of 55 mm and a D of 370 mm. If the inner diameter D1 of the air outlet 18 and the inner diameter D2 of the fan guide 9 are made equal in this way, the air outlet 18
Ventilation loss due to the restriction is reduced, and the intake air volume and outlet air volume become equal, reducing noise and improving fan efficiency. In addition, by increasing the inner diameter D3 of the intermediate portion where the motor 2, heater 7, etc. are arranged,
By improving the ventilation between the inlet 13 and the outlet 18, the air taken in from the inlet 13 can flow smoothly to the outlet 18, and the retention time can be reduced by reducing the flow velocity in the middle part. By increasing the length, the contact time with the heater is increased, thereby increasing the heat transfer efficiency and making it possible to obtain a highly efficient dryer.

[Brief explanation of drawings]

The figure is a sectional view of an embodiment of the present invention. 1...Body case, 2...Motor, 3...Fan, 7...Heater, 9...Fan guide, 13...
...Intake port, 18...Blowout port, D1...Inner diameter of blowout port, D2...Inner diameter of fan guide, D3...Maximum inner diameter of intermediate portion.

Claims (1)

[Scope of utility model registration request] The cylindrical main body case 1 has an air outlet 1 at the front end and the rear end.
8 and the suction port 13 are formed, and the blowing port 1
In the hair dryer, a heater 7 and a motor 2 are housed in an intermediate portion between a fan 3 and an air inlet 13, and an inner diameter D2 of a fan guide 9 disposed on the outer periphery of a fan 3 disposed at the rear of the motor 2 is made equal to an inner diameter D1 of the air outlet 18,
The maximum inner diameter D3 of the intermediate portion is the inner diameters D1, D
A hair dryer characterized in that the diameter is larger than 2.