JPH0779881A - Hand dryer - Google Patents

Abstract

PURPOSE:To provide a hand dryer low in manufacturing cost and small in size thereof, which can be connected to an AC 100V power supply for household use in usage, and which is provided with a fan, a heater, and a DC brushless motor to drive the fan. CONSTITUTION:This hand dryer is provided with a fan 1, a heater 3, a DC brushless motor 2 which can be used around DC 140V, and a rectifying and smoothing power supply circuit for driving the DC brushless motor to be connected to an AC 100V power supply for household use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand dryer which has a fan and a heater and blows warm air on the hand to dry the hand.

[0002]

2. Description of the Related Art A hand dryer equipped with a fan, a heater, and a DC brushless motor for driving the fan is disclosed in Japanese Utility Model Publication 5-2.
No. 9494. The hand dryer of Japanese Utility Model Laid-Open No. 5-29494 uses a high-output DC brushless motor to achieve downsizing of the device, large air flow, and long life.

[0003]

Conventionally, the power supply voltage of a DC brushless motor has been about 50 V at maximum.
Further, a DC stabilized power supply has been generally used conventionally for driving a DC brushless motor. Therefore, the actual Kaihei 5
When the hand dryer of No. 29494 is connected to a household AC 100 volt power supply and is used, a rectifying / smoothing circuit, a voltage drop transformer, and an expensive high output voltage stabilizing circuit are used. Therefore, there is a problem that the hand dryer is increased in size and the manufacturing cost is increased. The present invention has been made in view of the above problems, and provides a fan, a heater, and a DC brushless motor for driving a fan, which is small in size and low in manufacturing cost and which can be used by connecting to a household AC 100-volt power supply. An object is to provide a hand dryer equipped with the same.

[0004]

In order to solve the above problems, in the present invention, a fan, a heater, and a DC 14 are provided.
Provided is a hand dryer including a DC brushless motor that can be used in the vicinity of 0 V and a DC brushless motor driving rectifying and smoothing power supply circuit connected to a household 100 V power supply. In the preferred embodiment of the invention, the fan is a multilayer disc fan.

[0005]

In the hand dryer having the fan, the heater, and the DC brushless motor for driving the fan, the rotation speed of the DC brushless motor fluctuates according to the voltage fluctuation of the DC power supply, and the air volume of the fan fluctuates accordingly. On the other hand, the heat generation amount of the heater increases / decreases in response to the voltage fluctuation of the DC power supply, which in turn corresponds to the increase / decrease in the air volume of the fan. Therefore, even if the voltage of the DC power supply fluctuates, the temperature of the warm air that hits the human hand does not fluctuate. In other words, even if the voltage of the DC power supply fluctuates, the usability of the hand dryer does not deteriorate much. From the above, in the hand dryer including the fan, the heater, and the DC brushless motor for driving the fan, the voltage fluctuation of the DC power supply is considered to be an allowable disturbance. Based on the above recognition, the present invention allows the voltage fluctuation of the DC power supply to eliminate the voltage stabilizing circuit from the DC power supply circuit, and the power supply voltage is 140
By adopting a DC brushless motor in the vicinity of the battery, the voltage drop transformer is abolished.
An object of the present invention is to provide a hand dryer that can be used by being connected to a volt power supply and that is small in size and low in manufacturing cost and that includes a fan, a heater, and a DC brushless motor for driving the fan.

[0006]

Embodiments FIGS. 1 and 2 show a hand dryer according to an embodiment of the present invention.
It will be described based on. As shown in FIG. 1, the hand dryer according to this example includes a multilayer disc fan 1 and a D for driving the fan.
C brushless motor 2, heater 3, photoelectric sensor 4
And a controller 5. As shown in FIG. 2, the DC brushless motor 2 has a synchronous motor 2a having a permanent magnet type rotor, a transistor commutator 2b, and a control IC 2c. The DC brushless motor 2 is configured so that the power supply voltage is 140 volts. The transistor commutator 2b of the DC brushless motor 2 is connected to an output terminal of a rectifying / smoothing circuit 6 having an input terminal connected to a household AC 100-volt power supply and composed of a diode bridge 6a and a capacitor 6b. The heater 2 is connected to a household AC 100 volt power supply. Control IC 2c and controller 5
And the photoelectric sensor 4 is a low voltage D (not shown) for control.
It is connected to the C power supply. The detection signal of the photoelectric sensor 4 is input to the controller 5, and the control signal is output from the controller 5 to the control IC 2c and the heater 3.

In the hand dryer having the above structure,
When a person puts his / her hand in front of the air outlet of the multilayer disc fan 1, the photoelectric sensor 4 detects the hand and outputs a detection signal to the controller 5. The controller 5 is the photoelectric sensor 4
Heater 3 and control IC 2 based on the detection signal of
A control signal is output to c and. The transistor commutator 2b operates under the control of the control IC 2c, and a current is sequentially applied to the stator winding of the synchronous motor 2a of the DC brushless motor 2 to rotationally drive the permanent magnet type rotor of the synchronous motor 2a. As a result, the multilayer disc fan 1 rotates and discharges air. The discharged air is heated by the heater 3 to become warm air. The warm air blown from the air outlet of the multilayer disc fan 1 hits the hand and dries it.

In this hand dryer, household AC10
The 0-volt power source is rectified and smoothed by the rectifying / smoothing circuit 6, and is applied to the transistor commutator 2b of the DC brushless motor 2 as a DC 140-volt power source. Since the DC brushless motor 2 is configured so that the power supply voltage is 140 V, it is rectified by the rectifying / smoothing circuit 6.
It operates smoothly with a smoothed 140V DC power supply. This hand dryer is a DC for DC brushless motors.
The voltage stabilizing circuit is eliminated from the DC power circuit by allowing the voltage fluctuation of the power source, and the voltage drop transformer is eliminated by adopting the DC brushless motor 2 having a power source voltage of 140 V. The cost is low.

When the voltage of the household AC 100-volt power supply changes due to load fluctuations or the like, the voltage of the DC power supply applied to the transistor commutator 2b of the DC brushless motor 2 also changes. As a result, the rotation speed of the DC brushless motor 2 changes, which in turn changes the amount of air blown from the multilayer disc fan 1. On the other hand, when the voltage of the household AC 100-volt power supply changes, the heat generation amount of the heater 3 also changes. Therefore, even if the voltage of the household AC 100-volt power supply changes due to load fluctuations or the like, the temperature of the air blown from the hand dryer does not change. That is, even if the voltage of the household AC 100-volt power supply changes, the usability of the hand dryer does not deteriorate much.

Since the multilayer disc fan 1 is used in the hand dryer, the operating noise is low and the operation is very quiet.
Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, the power supply voltage of the DC brushless motor 2 may be around 140 V, and 1
It is not limited to 40 volts.

[0011]

As described above, in the hand dryer according to the present invention, the voltage fluctuation of the DC power source for driving the DC brushless motor is allowed, the voltage stabilizing circuit is eliminated from the DC power source circuit, and the power source voltage is around 140 Vol. Since the voltage drop transformer is eliminated by adopting the DC brushless motor, the size is small and the manufacturing cost is low.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a hand dryer according to an embodiment of the present invention.

FIG. 2 is a diagram showing a rectifying / smoothing circuit for a DC brushless motor drive power source of the hand dryer shown in FIG.

[Explanation of symbols]

 1 Multilayer Disc Fan 2 DC Brushless Motor 2a Synchronous Motor 2b Transistor Commutator 2c Control IC 3 Heater 4 Photoelectric Sensor 5 Controller 6 Rectification Smoothing Circuit 6a Diode Bridge 6b Capacitor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichiro Himuro 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City Totoki Kikai Co., Ltd. (72) Inventor Shin Hatakeyama 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu No. Totoki Equipment Co., Ltd.

Claims (2)

[Claims] 1. A fan, a heater, a DC brushless motor that can be used near DC 140 volts, and a household use 10.
A hand dryer comprising: a DC brushless motor driving rectifying / smoothing power supply circuit connected to a 0 volt power supply. 2. The hand dryer according to claim 2, wherein the fan is a multi-layer disc fan.