JP2012110584A - Heating blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable easy and appropriate air temperature control.SOLUTION: The heating blower includes a fan for blowing air and a motor M for driving the fan, a heating part H heating the air made to flow by the fan, a detecting part N detecting voltage or current with which the motor is energized, and a control part C performing duty control of the power supplied to the heating part according to the result of detection of the detecting part.

Description

  The present invention relates to a heated air blower, and more particularly to a heated air blower having variable air blowing capacity.

  In a hair dryer that uses an AC power source for hair drying or hair setting, the blowing capacity is usually changed depending on whether half-wave energization or full-wave energization is performed on the blowing motor. In this case, it is necessary to control the electric power supplied to the heater for heating according to the air volume or according to the air temperature so that the air temperature when the air volume is reduced does not become too high.

  For this reason, conventionally, a means for detecting the position of a mechanical switch for switching the air volume is provided to switch the heater supply power, or the heater supply power is switched according to the air temperature detected by the temperature sensor. Also, the heater power supply is switched by half-wave energization or full-wave energization in the same manner as the air volume (air blowing capacity).

  In this case, in addition to the need for detecting means for detecting the air volume or the air temperature, wiring to the detecting means is also required, which increases the cost and is not easy to assemble. Have. In addition, when the heater power supply is switched as described above, even if there is no problem in normal use, for example, if the air outlet is used close to the scalp to dry the scalp pinpoint, the air temperature is too high and the air outlet becomes too hot. It may be necessary to move away from the head, or it may be impossible to dry the scalp firmly due to low air temperature.

Japanese Patent Publication No. 60-3485

  This invention is made | formed in view of the above points, and makes it a subject to provide the heating air blower which can perform control of an air temperature simply and appropriately.

  The present invention includes a fan for blowing air and a motor for driving the fan, a heating unit for heating the air flowing by the fan, a detection unit for detecting a voltage or current supplied to the motor, and the heating unit. And a control unit that controls the duty of the supplied power according to the detection result of the detection unit. The air flow is detected by detecting the motor current or voltage, and the heating unit is duty-controlled.

  At this time, a step-down unit is provided between the power supply unit and the detection unit, and the power supply unit from the power supply unit through the on / off switch to the motor or from the power supply unit to the motor It is preferable that a branch line for supplying current is provided on one side of the step-down unit, and the detection unit is disposed on the branch line, and further, a discharge unit, and a liquid supply means for supplying liquid to the discharge unit, In the case of the apparatus including the second control unit that controls the liquid supply unit, it is preferable that the second control unit having a step-down unit from the power supply unit also serves as the step-down unit for the detection unit.

  In order to prevent hot air output due to overheating of the heater when the air volume drops, it is necessary to detect the air temperature or control the power supplied to the heater according to the air volume, but the air volume is detected by detecting the motor current or voltage. In order to perform the detection, there is no need to detect the position of a mechanical switch for switching the air volume, or to detect the air temperature by adding a temperature sensor, and a simple and low-cost configuration can be achieved. In addition, it is easy to obtain an appropriate air temperature in order to duty control the heating unit.

It is a block diagram of an example of an embodiment of the invention. It is a circuit diagram same as the above. It is a circuit diagram of another example. It is a circuit diagram of other examples. It is a circuit diagram of another example. It is a perspective view of a hair dryer. It is sectional drawing of a hair dryer. It is sectional drawing of the other example of a hair dryer.

  An example of an embodiment of the present invention will be described with reference to the drawings. A heating blower according to the present invention includes a motor M for driving a fan, a heating unit H for heating, and a power supply unit D as shown in FIG. In addition to this, the detection unit N that detects the voltage or current that is supplied to the motor M, and the control unit C that receives the signal from the detection unit N and duty-controls the power supplied to the heating unit H in a preset state. And.

  FIG. 2 shows a specific example in which the power source D is constituted by a DC power source V, the heating part H is constituted by a resistor R, and the detection part N is constituted by a resistor R1, and the resistor R1 is connected in series with a path through which a motor current flows. Is connected to. In addition, the control unit C includes a one-chip microcomputer, a control circuit IC1 to which the voltage across the resistor R1 is input, and a transistor TR1.

  When the main circuit is energized and a voltage is applied to the control circuit IC1, the control circuit IC1 operates, and the control circuit IC1 takes in the voltage generated across the resistor R1 in accordance with the current value of the drive current flowing through the motor M. Then, when it is time to drive the heating section H (resistor R), the control circuit IC1 outputs an H level control signal, applies a voltage to the base of the transistor TR1, turns on the transistor TR1, and supplies a current to the resistor R. Shed. Further, when an L level signal is output from the control circuit IC1 to the base of the transistor TR1, the transistor TR1 is disabled and the current to the resistor R is cut off. At this time, the control circuit IC1 controls the ON period (duty ratio) of the transistor TR1 according to the voltage across the resistor R1, that is, according to the drive current value flowing through the motor M, thereby generating the amount of heat generated by the resistor R. Is adjusted to a value corresponding to the amount of air blown by the motor M. Although not shown here, it is needless to say that the duty ratio may be controlled not only according to the air flow rate but also according to a set value separately set by the user.

  FIG. 3 shows another example. Here, the power source D is composed of a commercial AC power source, and switches SW1a and SW1b in parallel are connected between the power source D and the motor M. A rectifier diode D1 is connected in series on the switch SW1a side. A branch line is provided from the middle of the power supply line from the switches SW1a and SW1b to the motor M to the detection unit N including the voltage dividing resistors R5 and R6. In the figure, SD is a step-down unit that steps down the commercial AC power supply, and is composed of a diode bridge DB, a transformer T, and a three-terminal regulator IC2 in parallel with the power supply unit D.

  The voltage dividing resistor R5 in the detection unit N is connected to the cathode side of the rectifier diode D1, and both ends of the voltage dividing resistor R6 connected in series with R5 are connected to the secondary ground G side of the control circuit IC1 and the diode bridge DB. ing. A triac TR connected in series with the heating part H (resistors R, R) is connected in parallel with the power supply part D.

  The control unit C outputs a control circuit IC1 that outputs a control signal for the heating unit H, a phototriac PT, the triac TR, a resistor R4 that limits the primary side current of the phototriac PT, and a secondary side current of the phototriac PT. The limiting resistor R3 is used.

  Now, if the switch SW1a connected in series with the rectifier diode D1 is made conductive, a half-wave power waveform is applied to the motor M from the power supply unit D. When the switch SW1b that is not connected in series with the rectifier diode D1 is turned on, a full-wave power waveform is supplied to the motor M from the power supply unit D.

  On the other hand, when a current flows from the power supply unit D to the step-down unit SD, full-wave rectification is performed via the diode bridge DB, and, for example, 5V power is supplied from the three-terminal regulator IC2 to the control circuit IC1.

  When the switch SW1a is turned on and current flows from the power source D in the direction A in the figure, the motor drive current does not flow to the rectifier diode D1, passes through the voltage dividing resistors R5 and R6 of the detecting unit N, and is divided. A voltage is generated in the resistor R6. Even when a current flows from the power source in the direction B in the figure, a current flows from the switch SW1a through the rectifier diode D1 to the voltage dividing resistors R5 and R6, and a voltage is generated in the voltage dividing resistor R6.

  On the other hand, when the switch SW1b is turned on, if a current flows in the direction from the power supply unit D to the A, the motor drive current flows to the switch SW1b, and no current flows to the detection unit N. When a current flows in the direction from D to B, a current flows through the switch SW1b and the voltage dividing resistors R5 and R6, and a voltage is generated at the voltage dividing resistor R6.

  Since the voltage applied to the voltage dividing resistor R6 differs depending on which of the switches SW1a and 1b is turned on, that is, whether the motor driving current is half-wave energized or full-wave energized, this is detected by the control circuit IC1. The control circuit IC1 outputs an H level signal to the port to which the phototriac PT is connected at the timing when the heating unit H is turned on, and conducts the primary side of the phototriac PT via the resistor R4. As a result, the secondary side of the phototriac PT is also conducted through the resistor R3, the triac TR is turned on, and the heating part H is conducted. If an L level signal is output to the port to which the phototriac PT of the control circuit IC1 is connected, the triac TR is turned off and the heating part H is turned off.

  At this time, if duty control is performed with a pattern in which one half wave is energized and then two half waves are de-energized, the triac TR can be energized with a power of 1/3 of the full wave ratio. Compared with the case where the heating part H is driven half-wave with a diode, a power reduction of 32% can be achieved. When the heating air blower is a hair dryer, the energization of the heating unit H in such a pattern is that the scalp becomes too hot even when the air outlet is brought close to the scalp in order to dry the scalp pinpoint. Therefore, not only the hair but also the scalp can be firmly dried.

  The branch line connected to the detection unit N may be provided in the middle of the power supply line from the power supply unit D to the motor M as shown in FIG. In any case, the detection of the motor drive current is usually performed by measuring the voltage across the resistor with the resistor in the path, so two wires are connected to both ends of the resistor. Then, since one electric wire shares an existing electric wire, it is only necessary to newly provide a branch line, and the wiring is simplified and the assembling property is improved.

  FIG. 5 shows another example. Although the structure of the detection part N and the structure of the control part C which controls the heating part 4 are the same as what was shown in FIG. 3, the discharge part DCG and the 2nd control part C2 are added. Here, the discharge part DCG is for electrostatic atomization of water, and the second control part C2 obtains moisture in the air as condensed water by cooling, and supplies liquid supply means (for the electrostatic atomization). For example, it is for driving control of the Peltier element) P.

  The second control unit C2 in the illustrated example also serves as a step-down unit SD for the detection unit N, and the transformer T in the step-down unit SD is also used as a voltage conversion transformer of the liquid supply means P. That is, the transformer T is obtained by winding the windings T1p, T1s, T1b around the same bobbin, and the turns ratio is T1p: T1s: T1b = 146: 4: 9. The liquid supply means P is provided to the winding T1s. The power supply for driving the liquid supply means P is connected.

  When power is supplied from the power supply unit D to the second control unit C2 via the diode bridge DB, the transformer T is activated to start oscillation. A voltage of about 8V is generated in the winding T1b. By connecting the winding T1b to the input portion of the three-terminal regulator IC2, a power source of the control unit C is configured, and the current flowing into the detection unit N is Return to the ground G of the second controller C2. The discharge unit DCG oscillates intermittently at a period twice that of the power supply unit D (AC 100 V / 50-60 Hz), and outputs −4.2 kV for discharge for electrostatic atomization when the load is 250 MΩ.

  Since the step-down means provided in the second control unit C2 that controls the liquid supply means P also serves as the step-down unit SD of the detection unit N, it is not necessary to provide a step-down unit for the detection unit N separately. Therefore, the circuit configuration can be simplified, and the cost can be reduced and the space can be saved.

  FIG.6 and FIG.7 has shown an example of the hair dryer provided with the electrostatic atomization part 21 and the metal microparticle generation | occurrence | production part 22 which applies a high voltage to a zinc electrode or a platinum electrode as said discharge part DCG, A motor body M, a fan 12 driven by the motor M, and a heating unit H are built in the main body 1 having a suction port 11 on the back surface and a blow-off port 13 on the tip. A slide operation unit 14 for operating the switches SW1a and SW1b is provided on the front surface of the grip unit 10 that is foldably connected. An operation unit 15 arranged at a position where the finger can be operated by a hand gripping the grip unit 10 on the side surface of the main body 1 is for changing the power supplied to the heating unit H. The control unit C changes the duty ratio of duty control for energizing the heating unit H.

  FIG. 8 shows a hair dryer with a brush as a heating blower. A cylindrical body having a suction port 11 at one end and a blowout port 13 at the other end, and a motor M, a fan 12 and a heating unit H are built in the main body 1 which also serves as a grip portion. A brush attachment 3 having a hollow cylindrical shape with a closed tip and having a large number of brushes 30 and a large number of small-diameter discharge ports 31 on the peripheral surface is attached.

  In the above embodiment, a hair dryer or a hair dryer with a brush for squeezing the hair is shown as an example. For example, the heating air blower according to the present invention is not limited to these.

C control unit D power supply unit H heating unit M motor N detection unit

Claims (3)

  A fan for blowing air, a motor for driving the fan, a heating unit for heating the air flowing by the fan, a detection unit for detecting a voltage or a current supplied to the motor, and power supplied to the heating unit And a control unit that performs duty control according to the detection result of the detection unit.   A step-down unit is provided between the power supply unit and the detection unit, and the step-down unit is connected from the middle of the power supply line from the power supply unit to the motor through the on / off switch or from the middle of the power supply line to the motor. The heating air blower according to claim 1, wherein a branch line through which a current flows is provided on one side, and the detection unit is arranged on the branch line.   The second control unit includes a discharge unit, a liquid supply unit that supplies a liquid to the discharge unit, and a second control unit that controls the liquid supply unit, and the second control unit including a step-down unit from a power supply unit detects the detection unit. The heating air blower according to claim 2, which also serves as the step-down part for a part.

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