JP2597884B2 - Hair treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is an apparatus for performing a predetermined treatment on hair by switching between hot air and cold air, such as a hair dryer and a hair curler, and particularly involves controlling the temperature of the hot air. About things.

[Prior Art] Conventionally, as a method for controlling the temperature of hot air, a temperature detecting means such as a thermistor is provided on the downwind side of the hot air, and phase control of electric power supplied to the heating means in accordance with the detected temperature of the detecting means is performed. In many cases, the hot air temperature is kept substantially constant.

Furthermore, the present applicant has previously proposed a device provided with a quenching switch for stopping only the power supply to the heating means, separately from the main switch, so that the switching operation between hot air and cold air can be easily performed.

[Problems to be Solved by the Invention] However, since the temperature detecting means itself has a heat capacity, a deviation between the actual hot air temperature and the detected temperature can be avoided immediately after switching from cold air to hot air. As a result, there is a risk that an excessively large amount of electric power is supplied to the heating means without sufficient temperature control, and abnormally high hot air is formed.

The present invention has been made in view of such a problem,
An object of the present invention is to provide a hair treatment device capable of preventing the danger of hot air being in an abnormally high temperature state.

A further object of the present invention is to provide a hair treatment device in which the temperature control operation of the air blowing is appropriately performed even if the switching between the hot air and the cold air is frequently repeated.

[Means for Solving the Problems] FIG. 1 shows a basic configuration of a hair processing apparatus configured to achieve the above object, and includes a blowing unit,
Means for heating the air sent from the blowing means, means for detecting the temperature of the heated hot air, means for controlling the power supplied to the heating means in accordance with the temperature detected by the detecting means, and blowing means A main switch 5 for regulating the timing of starting current supply to the heating means.

In addition to the above-described configuration, the present invention provides a means for restricting the power supplied to the heating means for a predetermined time after the start, and an energization of the heating means in conjunction with the rapid cooling start operation during the ON period of the main switch 5. And a quenching switch capable of forcibly stopping the quenching, and activating the above-mentioned power limiting means in conjunction with the quenching termination operation of the quenching switch.

[Operation] With the configuration described above, when the main switch 5 is turned on, the commercial AC power supply 8 supplies electricity to the blowing means and the heating means, so that hot air with temperature control by the temperature detection means and the control means is sent. .

Here, when the quenching switch 30 is turned on, the energization of the heating means is forcibly stopped, and the hair treatment is performed only by blowing without heating.

When the quenching switch 30 is turned off in such a state, the heating unit is energized to restart the heating of the blast, and at the same time, the limiting unit is started, the limiting unit forcibly limits the power supply to the heating unit, Abnormal heat generation due to the difference between the detection means and the hot air temperature is prevented.

This power limitation state continues for a predetermined time until the temperature of the detecting means is stabilized, and thereafter, the power control for the heating means by the detecting means and the control means is normally performed, and the air is blown by the stable temperature control. .

[Example] Hereinafter, an example in which the present invention is applied to a hand-held hair dryer that performs only air blowing will be described. However, it is possible to apply the present invention to various hair treatment apparatuses such as those equipped with a curling brush or a heating iron in a similar manner. Of course.

As shown in FIG. 2, the dryer according to the present invention includes a heating unit 2 in a substantially cylindrical main body case 1.
Is blown from the blowing section 3 provided on the base end side to the heating section 2. Further, the handle 4 is extended downward from the base end side of the main body case 1, and a main switch 5 for regulating the start of energization to the blowing unit 3 and the heating unit 2, and a heating unit 2 inside the handle 4. And an electric circuit 6 for performing power control on the power supply from a commercial power supply 8 via a power supply plug 7.

As shown in FIG. 3, the blower 3 is a DC motor for driving a diode bridge 10 for full-wave rectification and a fan 11.
One end on the input side of the diode bridge 10 is connected to one end of the power plug 7 via the main switch 5, and the other end is connected via a resistor 14 for voltage drop, the heating unit 2 and the temperature fuse 15. By connecting to the other end of the power plug 7, the motor 12 is energized in connection with the ON operation of the main switch 5, and the fan 11 is driven to rotate to blow air toward the heating unit 2.

The heating unit 2 is configured by connecting first and second heaters 16 and 17 having a predetermined power capacity in series.
A switch 18 is provided in parallel with the heating unit 2 by bypassing both ends of the second heater 17 when the switch 18 is turned on.
The total amount of heat generated can be switched between high and low. Further, a control unit 20 and a noise prevention circuit are connected in series with the heating unit 2.
The control unit 20 controls the power supplied to the heating unit 2.

In addition, instead of increasing or decreasing the number of heaters to change the heat generation capacity of the heating unit 2, the heat generation capacity can be reduced by interposing a diode in series with the heater as necessary.

The control unit 20 uses a bidirectional thyristor such as a triac as the phase control element 21 and includes a bidirectional switching element 22 such as SBS for generating a trigger signal for the phase control element 21. Further, a positive temperature coefficient thermistor is provided on the lee side of the heating unit 2 as a hot air temperature detecting element 23, and a charging / discharging circuit is formed by the detecting element 23 and the capacitor 24.
Make up 25. Therefore, every half cycle of the input commercial AC voltage, the capacitor 24 of the charge / discharge circuit 25
Is charged and discharged at a speed determined by the time constant of
Switching element when the voltage across 24 exceeds a predetermined value
22 is turned on and a trigger signal is sent to the phase control element 21 to perform predetermined phase control. Here, the time constant of the charging / discharging circuit 25 changes depending on the resistance value of the thermistor provided as the detection element 23. The thermistor has a positive characteristic, and the resistance value sharply increases when the temperature rises above a predetermined control temperature. Such an increase in the resistance value increases the time constant of the charge / discharge circuit 25 to increase the control angle, and reduces the power supplied to the heating unit 2 so that the wind temperature does not rise above the control temperature.

In addition to the above configuration, the present invention further includes a quenching switch 30 that turns on the main switch 5 to forcibly stop energization of the heating unit 2 during the air blowing operation, and operates in conjunction with the operation of the quenching switch 30. And a timer unit 31 that performs the operation.

The quenching switch 30 is used to frequently switch between hot air and cold air to easily perform a hair processing operation such as a hair curl. By providing the operation knob 32 on the upper part of the case 1, the operation knob 32 can be held while the main body case 1 is held.
It is possible to easily and surely change the cool air and the hot air simply by pressing the button. That is, the contact of the quenching switch 30 is switched by the tip of the operating rod 33 that is hung down when the operating knob 32 is pressed, and both ends of the capacitor 24 of the control unit 20 are short-circuited by the switch contact. The input of the trigger signal is forcibly cut off, the control element 21 is always turned off, and the power supply to the heating unit 2 is stopped.

The timer unit 31 keeps the heating unit 2
A power supply circuit 34 for forming a predetermined DC voltage, and a timer for determining a timer time by performing a charge / discharge operation by applying a DC voltage formed by the power supply circuit 34. Time control circuit 35
A switching circuit 36 that is turned on and off by the charging / discharging operation; and a control unit 20 when the switching circuit 36 is turned on.
And a diode 37 that bypasses the charging current for the capacitor 24 during each half cycle of the commercial AC voltage.

The power supply circuit 34 rectifies the commercial AC voltage input via the power supply plug 7 with the diode 38, and then forms a DC voltage sufficiently stabilized by the Zener diode 39 and the large-capacity capacitor 40. Note that a resistor is connected in parallel with the capacitor 40.
By connecting 41, the application of the input voltage to the power supply circuit 34 is cut off and the capacitor 40 is discharged at the same time, so that the voltage applied to the timer time control circuit 35 can be stopped early.

The timer time control circuit 35 includes a capacitor 42 and a resistor 43
When the main switch 5 is turned on or when the quenching operation of the quenching switch 30 is stopped, charging of the capacitor 42 via the resistors 43 and 44 with the voltage output from the power supply circuit 34 is started. Is turned off or when the quenching switch 30 is rapidly cooled.

The switching circuit 36 controls on / off of the Darlington-connected transistors 46 and 47 by a voltage drop across the resistor 44 due to the charging current flowing through the capacitor 42 of the timer time control circuit 35, and connects between the collector and the emitter of the transistor 47. It is connected in parallel with both ends of the capacitor 24 of the control unit 20 via a diode 37. Therefore, during the ON operation of the switching circuit 36, both ends of the capacitor 24 of the control unit 20 are short-circuited only for a half cycle of the commercial AC voltage by the diode 37, thereby stopping the control of the phase control element 21 and using the temperature detection element 23. The heating unit 2 supplies half of the power when the power control is performed.

Here, the temperature of the detection element 23 itself is lower than the hot air temperature for about 10 seconds immediately after the start of the dryer or immediately after the transition from the rapid cooling state to the heating state, and the resistance value of the element 23 is maintained at a low value. Then, the control unit 20 is in a non-control state in which the heating unit 2 is energized for substantially the entire period, and attempts to supply the heating unit 2 with power close to the power capacity limit. However, in the present embodiment, the power supplied to the heating unit 2 is forcibly limited to about half by the timer unit 31, thereby preventing the hot air from becoming abnormally high temperature. ,
A sufficiently large electric power is supplied to the heating unit 2 to prevent the temperature of the hot air from abnormally lowering.

Note that when the power supply stop time to the heating unit 2 is short, the temperature of the detection element 23 is not completely cooled, and the time limit by the timer unit 31 may be shorter than the above-described 10 seconds. Therefore, in this embodiment, the capacitor 42 is discharged at a predetermined time constant at the same time as the energization of the timer unit 31 is cut off, so that the capacitor 42 is completely discharged in an off time of about 30 seconds, for example. Thus, control corresponding to the temperature of the sensing element 23 itself is performed.

[Effect of the Invention] As described above, according to the present invention, the means for restricting the power supply to the heating means for a predetermined time is provided, and the start-up time of the limiting means is regulated in conjunction with the operation of the rapid cooling switch 30. Even if heating and cooling are frequently repeated using the quenching switch 30, safe hair processing can always be performed without generating abnormally high temperatures.

Further, the control means employs a phase control method using a charge / discharge circuit 25 for the detection element 23 of the positive temperature coefficient thermistor and the capacitor 24, and restricts or stops the power supply to the heating means, bypasses the charging current of the capacitor 24. By doing so, it is possible to easily and reliably perform intermittent or limiting of a large current by controlling a very small current.

Furthermore, by setting the time limit of the power to the heating means to correspond to the stop time of the heating means by the quenching switch 30, the hot air temperature is too limited even if heating and cooling are repeated frequently. There are many advantages such as stable hot air temperature can be maintained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a basic configuration of the present invention. 2 and 3 show an example in which the present invention is applied to a dryer, FIG. 2 is a partially cutaway front view showing the entire shape, and FIG. 3 is an electric circuit diagram. 2 ... heating unit, 3 ... blowing unit, 5 ... main switch, 20 ... control unit, 21 ... phase control element, 23 ... detection element, 24 ... condenser, 30 ... rapid cooling switch, 31 ... ... Timer section.

Claims (3)

(57) [Claims] An air supply means for heating air sent from the air supply means; a means for detecting a temperature of the heated hot air; and an electric power supplied to the heating means in accordance with the temperature detected by the detection means. And a main switch for regulating the timing of energization of the blowing means and the heating means, and a means for limiting the power supplied to the heating means for a predetermined time after starting. A quenching switch capable of forcibly stopping energization of the heating means in conjunction with the rapid cooling start operation during the ON period of the main switch, and in conjunction with the rapid cooling end operation of the rapid cooling switch, A hair processing apparatus for activating a power limiting unit. 2. A blowing means, means for heating air sent from the blowing means, and a resistance value corresponding to a change in the heated air temperature, wherein the resistance value rapidly increases when a predetermined control temperature is exceeded. Detecting element (23)
And a control unit that controls the control angle of the phase control element (21) using the charge and discharge characteristics of the capacitor (24) connected in series with the detection element (23), and automatically controls the power supplied to the heating means. (20), a main switch (5) for regulating the timing to start energizing the blower means and the heating means, and both ends of the capacitor (24) of the control unit (20) are short-circuited while the main switch (5) is on. And phase control element (21)
A quenching switch (30) that can forcibly turn off the capacitor, and a charging current for the capacitor (24) for a predetermined time after the short-circuit state of the capacitor (24) is released by the quenching switch (30). A hair treatment device comprising a timer unit (31) that bypasses each half cycle. 3. A capacitor (24) provided by a timer section (31).
The bypass time is set so that the shorter the energization stop time, the shorter the energization stop time, and the shorter the energization stop time, and the energization of the timer unit (31) is stopped in conjunction with the rapid cooling start operation of the rapid cooling switch (30). The hair treatment apparatus according to claim 2, wherein the power supply to the timer section (31) is restarted in conjunction with the rapid cooling end operation.