JPH01288207A - Hair processing unit - Google Patents

Abstract

PURPOSE:To prevent a danger that a hot wind is made into an abnormally high temperature condition beforehand by providing a means to restrict a power supply to a heating means for a prescribed time, interlocking with the operation of a rapid cooling switch, and regulating the activating period of a control means. CONSTITUTION:The time constant of a charging and discharging circuit 25 of a control part 20 is changed by the resistance value of a thermistor equipped as a detecting element 23, the thermistor is a positive characteristic, the resistance value is rapidly increased when it intends to rise to a prescribed control temperature or above, the time constant of the charging and discharging circuit 25 is made large, a control angle is increased, a power supplied to a heating part 2 is narrowed, and a wind temperature is prevented from rising to the control temperature or above. In addition, the title unit is equipped with a quenching switch 30 to turn on a main switch 5 and to compulsorily stop a current flowing to the heating part 2 in the middle of a blasting action and a timer part 31. The rapid cooling switch 30 short-circuits capacitor 24 both terminals of the control part 20 at a switch contact, compulsorily interrupts the input of a trigger signal to a phase control element 21, causes the control element 21 to be always in an off-condition, and stops the current flowing to the heating part 2. The timer part 31 causes the supply power to the heating part 2 to be restricted for a prescribed time after an activation.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention can switch between hot and cold air like a hair dryer or hair curler! No. 11 relates to an apparatus for subjecting hair to a predetermined treatment, particularly one involving temperature control of hot air.

[Prior Art] Conventionally, as a method of controlling the temperature of hot air of this type, a temperature detection means such as a thermistor is provided on the lee side of the hot air, and the phase of the electric power supplied to the heating means is controlled in accordance with the temperature detected by the detection means. In many cases, the temperature of the hot air is kept approximately constant by doing this.

Furthermore, the present applicant has previously proposed a device that provides a rapid cooling switch that stops only the energization to the heating means, separate from the main switch, so that switching between hot air and cold air can be easily performed.

[1. The section that Ming tries to solve! ! ! ] However, since the temperature detection means itself waits for heat capacity, it is inevitable that a gap will occur between the actual hot air temperature and the detected temperature immediately after switching from cold air to hot air.
As a result, there is a risk that more power than required is supplied to the heating means without sufficient temperature control, resulting in the formation of abnormally hot air.

The present invention has been made in view of this problem, and an object of the present invention is to provide a hair treatment device that can prevent the risk of hot air reaching an abnormally high temperature.

A further object of the present invention is to provide a UR hair treatment device that can appropriately control the temperature of the air even when switching between hot air and cold air is repeated frequently.

[Means for Solving the Problems] Figure 1 shows the basic configuration of a hair treatment device configured to achieve the above object, which includes a blower and a heating device for heating the air sent from the blower. a means for detecting the temperature of the heated hot air; a means for controlling the electric power supplied to the heating means in accordance with the temperature detected by the detecting means; and regulating when to start energizing the blowing means and the heating means. The main switch 5 is equipped with a main switch 5 to

In addition to the above-mentioned configuration, the present invention includes a means for limiting the power supplied to the heating means for a predetermined period of time after startup, and a means for restricting the supply of electricity to the heating means while the main switch 5 is on. IItl
In addition to being equipped with a quenching switch 30 that stops in a J-like manner,
It is characterized in that the activation timing of the restriction means is regulated in conjunction with the operation of the M quenching switch 30.

[Function] With the above configuration, when the main switch 5 is turned on, the blowing means and the heating means are energized from the commercial AC 1t[8, and hot air is sent with temperature control by the temperature detection means and the control means. It will be done.

When the quenching switch 30 is turned on here, the electricity supply to the heating means is stopped 91 times, and the hair treatment is performed only by blowing air without heating.

When the quenching switch 30 is turned off in such a state, the heating means is energized and the heating of the air is restarted, and at the same time, the restriction means is activated, and the restriction means forcibly restricts the power supply to the heating means, thereby reducing the temperature at the initial stage of heating. To prevent abnormal heat generation caused by a difference between the detection means and the heat X temperature.

This power restriction state continues for a predetermined time period during which the temperature of the detection means is stabilized, and thereafter the power control of the heating means by the detection means and the control means is performed normally, and air is blown with stable temperature control.

[Example] An example in which the present invention is applied to a hand-held hair dryer that only blows air will be shown below, but it is also possible to apply the present invention in substantially the same way to various hair treatment devices, such as those equipped with a curling brush or a heating iron. Of course.

The dryer according to the present invention is as shown in FIG.

A heating section 2 is provided in a substantially cylindrical main body case 1, and air is blown toward the heating section 2 from an air blowing section 3 provided on the base end side of the main body case 1, and further downward from the base end side of the main body case 10. A main switch 5 is provided inside the handle 4 to regulate when to start energizing the blower section 3 and the heating section 2.

The heating section 2 is provided with an electric circuit 6 for controlling power to the heating section 2, and can be supplied with power from a commercial power source 8 via a power plug 7.

As shown in FIG. 3, the blower section 3 consists of a diode bridge 10 for full-wave rectification and a DC motor 12 that rotationally drives a fan 11. It is connected to one end of the power plug 7, while the other end is connected to the voltage drop resistor 14 and the heating part 2.
By connecting it to the other end of the power plug 7 via the temperature fuse 15, the motor 12 is energized in conjunction with the ON operation of the main switch 5, and the fan 11 is rotated to blow air toward the heating section 2. Let's do it.

The heating section 2 has first and second heaters 16 and 17 having a predetermined power capacity connected in series. A switch 18 is provided in parallel with the second heater 17, and when the switch 18 is turned on, the second heater 16 and 17 are connected in series. By bypassing both ends of the heater 17, the amount of heat generated by the heating section 2 as a whole can be switched between high and low levels.

Furthermore, a control unit 20 and a noise prevention port 18 are connected in series with the heating unit 2.
3, and the power supplied to the heating section 2 is controlled by the control section 20.

Note that instead of changing the heat generation capacity of the heating section 2 by increasing or decreasing the number of heaters, the heat generation capacity can also be reduced by interposing a diode in series with the heaters, if necessary.

The control unit 20 uses a bidirectional thyristor such as a triac as a phase control element 21, and also uses an SBS
A bidirectional switching element 22 such as the above is provided for generating a trigger signal for the phase control element 21. Furthermore, a positive temperature coefficient thermistor is provided on the leeward side of the heating section 2 as a hot air temperature detection element 23, and the detection element 23 and the capacitor 24 are connected to each other.
A charging/discharging circuit 25 is configured. Therefore, every half cycle of the input commercial AC voltage, the capacitor 24 of the charging/discharging circuit 25 is charged and discharged at a rate determined by the time constant of the circuit 25, and the voltage across the capacitor 24 exceeds a predetermined value. At times, the switching element 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 sensing element 23, but the thermistor has a positive characteristic and the resistance value rapidly increases when the temperature rises above a predetermined control temperature. This increase in resistance increases the time constant of the charger/discharger n25, increasing the control angle, and restricting the power supplied to the heating section 2 to prevent the air temperature from rising above the control temperature.

In addition to the above-described configuration, the present invention includes a rapid cooling switch 30 that can forcibly stop energizing the heating unit 2 during air blowing operation by turning on the main switch 5, and a rapid cooling switch 30 that operates in conjunction with the operation of the rapid cooling switch 30. The present invention is characterized in that it includes a timer section 31 that performs the following functions.

The quick cooling switch 30 is used to frequently switch between hot air and cold air to facilitate hair treatment operations such as curling the hair. By providing the operation knob 32 on the upper part of the case 1, the operation knob 3 can be operated while holding the main body case l.
By simply pressing 2, you can easily and reliably change between cold air and hot air. That is, the quenching switch 3 is closed at the tip of the operating rod 33 that hangs down when the operating knob 32 is pressed.
0 contacts and short-circuiting both ends of the capacitor 24 of the control section 20 with the switch contacts, such a
1), the input of the trigger signal to the phase control element 21 is forcibly cut off, the control element 21 is always turned off, and the power supply to the heating section 2 is stopped.

The timer section 31 operates the heating section 2 for a predetermined period of time after activation.
A power supply circuit 34 that can limit the power supplied to and forms a predetermined DC voltage, and the power supply port l83.
4, a timer time control circuit 35 performs a charging/discharging operation to determine the timer time by applying a DC voltage formed by the DC voltage, a switching circuit 36 performs an on/off operation according to the charging/discharging operation, and a control section when the switching circuit 36 is turned on. and a diode 37 that bypasses the charging current for the twenty capacitors 24 only during each half cycle of the commercial AC voltage.

The power supply circuit 34 rectifies the commercial AC voltage input via the power plug 7 with a diode 38, and then forms a sufficiently stabilized DC voltage with a Zener diode 39 and a large capacity capacitor 40.

By connecting a resistor 41 in parallel with the capacitor 40, the capacitor 40 is discharged at the same time as the input voltage is cut off to the power supply circuit 34, so that the voltage applied to the timer time control circuit 35 can be stopped early. ing.

The timer time control circuit 35 includes a capacitor 42 and a resistor 4.
Consisting of 3, 44, and 45, when main switch 5 is on,
Alternatively, when the quenching operation of the quenching switch 30 is stopped, charging of the capacitor 42 is started via the resistors 43 and 44 using the voltage output from the power supply circuit 34, and the capacitor 42 is discharged when the main switch 5 is turned off or when the quenching operation of the quenching switch 30 is operated. Do this.

The switching circuit 36 uses a voltage drop across the resistor 44 due to the charging current flowing to the capacitor 42 of the timer time control circuit 35, and connects the Darlington-connected transistor 46.
47, and controls the transistor 47 on and off.
7 is connected in parallel with both ends of the capacitor 24 of the control section 20 via a diode 37. Therefore, during the ON operation of the switching cycle 836 yen, both ends of the capacitor 24 of the control unit 20 are switched off by the diode 37 for only a half cycle of the commercial AC voltage, and the control of the phase control element 21 is stopped, and the temperature detection element 23 is used for power control, half of the power is supplied to the heating section 2.

Here, in the initial stage of starting the dryer or for about 10 seconds immediately after transitioning from a rapid cooling state to a heating state, the temperature of the sensing element 23 itself is lower than the hot air temperature, and the resistance value of the element 23 maintains a low value. , the control unit 20 enters an uncontrolled state in which the heating unit 2 is energized for almost the entire period, and attempts to supply the heating unit 2 with power close to the limit of its power capacity. However, in this embodiment, by forcibly limiting the electric power supplied to the heating unit 2 by about half using the timer unit 31, the hot air is prevented from becoming abnormally high temperature. Also, sufficiently large electric power is supplied to the heating unit 2, and the temperature of the hot air is prevented from dropping abnormally.

It should be noted that if the time during which the current supply to the heating section 2 is stopped is short, the temperature of the sensing element 23 has not completely cooled down, and the time limit set by the timer section 31 may be shorter than the above-mentioned 10 seconds. In this embodiment, the capacitor 42 is discharged at a predetermined time constant at the same time as the power to the timer section 31 is cut off, so that the capacitor 42 is completely discharged in an off time of about 30 seconds, for example. , control is performed in accordance with the temperature of the sensing element 23 itself.

[Effects of the Invention] As described above, the present invention is provided with means for restricting the power supply to the heating means for a predetermined period of time, and in conjunction with the operation of the quenching switch 30, the activation timing of the restricting means is regulated. , even if heating and cooling are repeated frequently using the quenching switch 30, abnormal high temperatures do not occur.
You can always safely treat your hair.

Further, the control means is a phase control method using a charging/discharging circuit 25 of a positive temperature coefficient thermistor detection element 23 and a capacitor 24, and the charging current of the capacitor 24 is bypassed to limit or stop the power supply to the heating means. By doing this, it is possible to easily and reliably interrupt or limit a large current by controlling an extremely small current.

Furthermore, by setting the power limit time for the heating means in accordance with the stop time of the heating means by the quenching switch 30, the hot air temperature is not too limited even if heating and cooling are repeated frequently. It has many advantages, such as being able to maintain a stable hot air temperature without any problems.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the 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 overall shape, and FIG. 3 is an electric circuit diagram. 2...Heating part, 3...Blower part, 5...Main switch, 20...Control part, 21...Phase control element, 23...Detection element, 24... Capacitor, 30... ・Quick cooling switch, 31... ・Timer section. Inventor: Takahashi Mima Osamu TonvI

Claims (1)

[Claims] 1. A blowing means, a means for heating the air sent from the blowing means, a means for detecting the temperature of the heated hot air, and a means for heating the heating means in response to the temperature detected by the detecting means. In a hair treatment device that is equipped with means for controlling the power supplied and a main switch that regulates when to start energizing the blowing means and the heating means, the power supplied to the heating means is controlled for a predetermined period of time after startup. and a quenching switch that forcibly stops energization to the heating means while the main switch is on, and regulating the activation timing of the limiting means in conjunction with the operation of the quenching switch. Characteristic hair treatment device. 2. A blowing means, a means for heating the air sent from the blowing means, and a sensing element whose resistance value changes in response to changes in the heated air temperature, and whose resistance value increases rapidly when a predetermined control temperature is exceeded. (23) and the charging/discharging characteristics of the capacitor (24) connected in series with the sensing element (23) to control the control angle for the phase control element (21) and automatically control the power supplied to the heating means. a main switch (5) that regulates when to start energizing the blowing means and the heating means;
By shorting both ends of the capacitor (24), the phase control element (
21), and the charging current to the capacitor (24) is switched off from the commercial AC power source (8) for a predetermined period of time after the short circuit of the capacitor (24) is released by the quick cooling switch (30). A hair treatment device comprising a timer section (31) that bypasses every half cycle. 3. The bypass time of the capacitor (24) by the timer section (31) is set to a predetermined set time as the upper limit, and is set to become shorter as the energization stop time is shorter, and is linked to the rapid cooling operation of the rapid cooling switch (30). Then, the power supply to the timer section (31) is stopped, and at the same time as heating is restarted, the timer section (31) is stopped.
3. The hair treatment device according to claim 2, wherein energization to the hair treatment device 31) is restarted.