JPS6029105A - Temperatue controller of hair dryer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a temperature control device for a heat sink.

(Backward technology) Figure 1 shows the configuration of a conventional hair dryer. -CΔ is the main body case, with 11 installed at the rear end for suction and 11 discharge port 2 at the front end ll B is the air blower installed at the suction port inside the main case The fan 4 is rotated by the heater 3 to blow air to the discharge port. C is a heater installed between the blower B and the outlet 2;
A heater coil 6 is wound around a 1-shaped heater board 5, and the upper heater board 5 is equipped with a resistor 7 for dropping the applied electric power from the motor 3 and an overtemperature rise preventer 1 such as a thermostat. A vessel 8 etc. is attached to the. D is a hair styling and drying accessory I, which is removably provided in the first part of the main body case Δ, and E is a board for an overnight rectification and noise prevention circuit. Further, numeral 9 indicates a hot stone heater 1, which together with the above-mentioned overtemperature rise preventer 8 constitutes a double safety mechanism.

At this point, use the Heno'Try N7 comb, brush, etc.) to move the hair away or curl it (
When drying and styling the hair, use 1 liter of water, but when drying and styling the hair, apply J to the hair, -] - [I #・5・
It is often rough, and the wind temperature can cause damage to the hair.
There are problems such as heat deformation of the acuffment.

However, in order to solve the above-mentioned white problem, (11c) (11c in Fig. 1) is formed by bimetallic contact point J
Heater C
By connecting the heater C in series and detecting changes in air temperature and turning on and off the power to the heater C, the J! Control of temperature was 11.

However, the bar metal of the switch has a large variation in detected temperature, which is 1 degree. It is not possible to control the discharge L1, but the response speed is slow.
If 5. is lowered or 1X=Yu stops for some reason, it will take a few seconds to several seconds to start operating.
During this time, the heater did not become red-hot, and if there was a buildup of lumps, etc., there was a possibility that an accident such as smoking would occur.

Purpose of the Invention) The present invention has been proposed in view of the above-mentioned problems, and focuses on the fact that red heat of the heater occurs when the rotational speed of the heater decreases, that is, due to insufficient air volume. An object of the present invention is to provide a temperature control device for hair drying with high safety level V1 by detecting the temperature in some form and promptly cutting off power to the heater when a decrease in the temperature is detected.

(N Illustrations of the Invention) FIG. 2 is a block diagram showing the basic configuration of the present invention. In the figure, 10 is a terminal to which a commercial power supply is connected,
This terminal has a heater 11° as a 9-pin switch element 1
Two series circuits are connected. On the other hand, a rotational frequency detection section 14 is connected to the motor 13 that blows air, and the output of the rotational frequency detection section 14 of the mouth is connected to the F-■ conversion section 15 (l and common to one input terminal of the comparator 18.19). In addition, the outputs J of the upper limit reference voltage generator 1G and the lower limit reference voltage generator 11 are respectively applied to the other input terminals of the comparator 18 and 19, and
, 19 are combined and sent to the sub-element control section 20.
and the output of this switch element control section 20 is J:
Accordingly, the switch element 12 is driven.

Therefore, the rotational speed of the computer 13 is determined by the rotational frequency detection section 14.
It is detected by the F-V conversion section 15 and converted into an electric juice value according to the rotation speed, which is added to one end of the comparator 18.11. If the output voltage is within the allowable range determined by the upper limit reference voltage generator 16 and the lower limit reference voltage generator 17, the switch element 12 is turned on to supply power to the heater 11. -77,1fil If the number of rotations of the motor 13 decreases due to the discharge port of the hair dryer being lowered or the number of rotations increases abnormally, the comparator 19 or the comparator 18 is reversed. The switch element 12 is turned on via the switch element control section 20, and the power supply to the heater 11 is interrupted to prevent red heat and the like.

Next, FIG. 3 shows a '1st embodiment of the present invention, which has a specific circuit 'C' configuration. The circuit is divided into four circuits: a blower block a, a frequency detection circuit, an F-V conversion circuit C1, a rotation speed upper limit setting circuit d, and a phase control circuit e. In the figure, R represents a heater, and 1
It is connected in series with the switching element TRTAC of the η-phase control circuit e and connected to a commercial power source. The blower block a has a rectifier 1 ridge rlef, , a block coil Lru +
11121: Consists of L1 CM, BUYOKI coil ML, L-FI2, E capacitor CM is for miscellaneous & prevention purposes.In addition, it is a resistor for RrqlJ motor step-down.Next, C5[-Y frequency The detection circuit is a tacho L, a ball element, and a sensor 9 that outputs an AC signal with a frequency corresponding to the rotation speed of a motor such as a tally encoder.
−8[. Next, the F-V conversion circuit C is an integrated circuit IC dedicated to F-V conversion (its function will be described later), and one other component and an ff
l 111? Preparation for a tlt climbing; At river use.
(A-l・lJ back, Tsuchi 7J-ta'-(A'-tip
Kano J, Rinaru. Next (, rotation fi + - limit 1/limit setting circuit (j[↓-1./valley, 'J 1iR11, 1M2
18R9...I [8. Input resistance RIll, l? : +112 and J: and a rectifier bridge Re (2 to 14 circuits) which acts as a kind of switch.Also, the phase control circuit e has a phase shift circuit (8 circuits and a resistor (1 to 1!L)). Small Mr. (-b angle) 1<outside.

]:/Asiri (JT, trigger time 8nS, switch element TIIIACJ).

Figure 11 (-(+ +, 1. r knee V conversion only (h
Hayabusa (^ times rll I shows I's IiT hat,
Accurate onesie 1 tsutoma Jl-vibrator and overnight OM,
Its output consists of a constant current source that is driven low. In other words, as shown in the figure ([]), a signal f whose frequency fluctuates
When IN is input, the one-shot multiple-by-break OM operates at the edge of the platform and outputs a signal Q having a constant pulse period and the same frequency. During the existence period of this signal Q, a current is applied from the constant current source to the resistor Re and the T71 capacitor C++ that constitute a 1-1 bus filter (integrator), and the amount of charge per medium time is equal to the signal f. Since C is proportional to the frequency of IN, the output voltage of the low-pass filter is ■. is a value that depends on the frequency.

Thus, in the circuit of FIG. 3, the rotational speed of 1 to 1 detected by the sensor () is converted into a voltage signal by the F-ν conversion circuit C, and the rotation speed is converted into a voltage signal by the F-ν conversion circuit C.

0M2 and is compared with the upper 1ζ limit value. SoshiC,
If the motor rotation speed is normal and within the specified value, the comparator (
The outputs of Jl, , C1112 suddenly become high level, the rectifier bridge Ref2 does not perform suction, G is triggered to the switch element TRI at the phase angle determined by the resistor Rth of the phase shift circuit and the capacitor CT, and an arc is applied to the heater RL. 1. Supply power continuously. -If the rotational speed of the t-torque increases or decreases for some reason and becomes outside the specified value, the comparator CM,
, 0M2 is inverted to 0-level, and the rectifier bridge Ref2 absorbs the current flowing to the capacitor 1Ct, so the switch element TRIAC is turned off, and the power supply to the heater R is turned off. . At this time, there is almost no transient response from abnormality detection to heater shutoff, so the heater does not become red hot or smoke, and is an ideal quick-actuation overheat prevention device.

In addition, a heat-sensitive element such as a positive characteristic 1 no mister is used as the resistance Rth of the phase shift circuit, and the temperature is usually kept constant at 1 m.

Alternatively, it is also possible to shut off the heater.

Next, FIG. 5 shows a second embodiment of the present invention, in which an electric current is inserted into the current path of an N-turn state motor and detected by a resistor.

That is, by rectifying and smoothing the voltage across the resistor R9 connected in series with the motor N1, a voltage signal corresponding to the rotational speed is obtained. However, according to this method, since the F-V conversion circuit C can be reduced, it can be constructed at a lower cost than the first embodiment, and has sufficient performance.

FIG. 6 shows a third embodiment of the present invention, in which two poles or multiple poles are installed on the rotor side of seven rotors. A reach coil SL is installed adjacent to the magnet, and the back electromotive voltage induced in the reach coil is rectified and smoothed to obtain a voltage signal corresponding to the motor rotation speed 1. In this case as well, since the [-V fluctuation circuit C can be omitted, the construction can be made at a lower cost than in the first embodiment, and the performance is also 11 minutes lower.

(Effects of the Invention) As described above, according to the present invention, in a dryer that is provided with an air blowing section and a heating section, and which controls the output of the heating section, -[- A detection section that outputs a signal according to the rotational speed at night, a comparison section that compares the output value of this detection section with a constant value and determines whether or not it is normal, and a It is composed of a switch section that supplies power to the heater in the hot section, so (a) there is less variation in temperature control than with conventional mechanical contacts using glue-t switches such as bimetals. Furthermore, since it is a quick-acting type, red heat, smoke, etc. from the heater can be completely prevented.

(01 Since it is controlled by the motor rotation speed, -
If something goes wrong in the evening, there is no risk of the heater turning on again.
Very safe.

(c) The upper limit can be freely set by changing the reference voltage of the comparator (line 7).

It has remarkable effects such as

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing the conventional hairdler r\1, Figure 2
3 is a circuit diagram showing the first embodiment, FIG. 4 is a partial detailed view of FIG. 3, and FIGS. Figure 1 is a circuit diagram C showing a second and third embodiment of the invention. a...Blower block, b...-3 frequency detection circuit, C...F-V conversion circuit, d...Rotational speed upper limit setting circuit, e...Phase control Circuit, RL...
・Heater, TRIAC... switch element, etc.] - name

Claims (4)

[Claims] (1) It is equipped with an iX calm section and a heating section, etc., and the output of the heating section is not controlled.In the atlier, a detection section that outputs an I signal according to the rotation speed of the air blowing section 9. , the output of the detection part of the mouth J (ffi is compared with a constant 1111, etc., and the comparison part which determines whether it is normal or old is different from 'r11) will supply power to the heater of the heating part according to the output of this comparison part. On A
) A switch part.
\-jJ l・Raiya's warm stone control l+ 1! -Oka. (2) Detection unit detects the rotation signal of J-9, but the output signal of this H-4 is detected by electric J1-9.
1'J5'l A temperature control device for a hexatrier according to claim 12, comprising a conversion circuit. (3) The temperature control device for hair drying v as set forth in Claim No. '1 #4 of the 14th Edition, wherein the detection portion comprises a resistor interposed in one current path of the t-ta. (4) The hair dryer according to Claim 11 JI, in which the detection part is a leaven 1il J, which is attached to the rotating shaft of the t-t (-J tJ magnet and c) installed in close proximity to this magnet. All temperature control devices.