JPS63715A - Temperature controller for warm air blower - Google Patents

Abstract

PURPOSE:To ensure the variable control of air temperature in a wide range via a variable resistor by unifying a PTC thermistor and a microheater into a plate form and setting the plane of this plate substance in parallel to the air blowing direction to reduce the electric power applied to the microheater. CONSTITUTION:A temperature sensor element 10 contains a PTC thermistor 10a and a microheater 10b unified together is set on a heater base board 11 supporting a heater 7. The heater 10b and the thermistor 10a are set in parallel to the air blowing direction and the area of the thermistor 10q is smaller than that of the heater 10b. Thus the heat conductivity is improved for both heater 10b and thermistor 10a. Then the stable control is secured with the air temperature is secured at a set level by control the microheater power with a variable resistor 9. At the same time, the set temperature can be changed in a wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a temperature control device (applied to a hot air obtaining device such as a hair dryer).

(Background technology) In devices that obtain hot air such as hair dryers, even if there are changes in the ambient temperature due to summer or winter, the air volume may change due to a decrease in the rotation speed of the fan or the intake port 2 discharge port is blocked. A phase control type wind temperature control device is used to keep the wind temperature constant even when there is a change in the air temperature, and to set the wind temperature variably.

For example, in Japanese Utility Model Publication No. 46-10977, as shown in FIG.
The air temperature is kept constant by controlling it with the TC thermistor 34, and the air temperature is kept constant by controlling the heat generation amount of the micro heater 37 with a variable resistor 38 connected in series with the micro heater 37 installed near the PTC thermistor 34. A device for variably setting the temperature is shown. Note that 36 is a bidirectional switching element that supplies gate current to the gate of the phase control element 33, 35 is a capacitor charged through the PTC thermistor 34, and 31 is a commercial power source.

However, in this air temperature control device, if the PTC thermistor 34 and the micro-heater 37 are simply placed nearby, the micro-heater 37 will
4, it is necessary to supply an excessive amount of power to the micro heater in order to vary the air temperature over a wide range. In those installed with
As a result, not only does the temperature stress on the micro-heater 37 and the like increase, but also the micro-heater power cannot be adjusted by the variable resistor 38 due to the limit of allowable power.

In this way, the micro heater 37 and the PTC thermistor 3
If the microheater 4 is simply placed nearby, the heat transfer efficiency is poor, and when the microheater power is TM adjusted by the variable resistor 38, there is a drawback that the variable range of the set temperature is small. In particular, in the case of a hair dryer, the setting range is limited when it is desired to change the air temperature according to the setting condition or preference when drying and setting the hair, resulting in an inconvenience that it is not easy to use.

(Object of the Invention) The present invention was proposed in view of the above points, and its purpose is to improve the heat transfer efficiency between the micro heater and the PTC thermistor, and to reduce the power consumption between the micro heater and the PTC thermistor using the variable resistor. To provide a temperature control device for a warm air fan, which can perform stable air temperature control at a set temperature by adjusting the temperature, and can vary the set temperature over a wide range.

(Disclosure of invention) Hereinafter, the present invention will be described in detail with reference to the drawings showing examples.

A first example in which the present invention is applied to a hair dryer is shown in the first example.
This will be explained based on the drawings to FIG.

Figure 1 shows the mechanical configuration of the hair dryer, in which a suction port 2 is formed at the rear of the main body 1, a discharge port 3 is formed at the tip, and a fan 4 is provided inside from the suction port 2 side. Motor 5. ! a Circuit board of temperature control device 6. Heaters 7 are arranged one after another. In addition, 8 is a switch to switch between ``° off'', ``cold air'', and ``warm air'', and 9 is a switch to change the air temperature! A heater board 11 that supports a variable resistor 10 and a heater 7
13 is a power cord.

In addition, the temperature sensor element 10 is shown in detail in FIG.
The micro heater 10b and the PTC thermistor 10m are arranged horizontally with respect to the air blowing direction, and the PTC thermistor 10a
The area of the micro heater 10b is made smaller than that of the micro heater 10b.

3 shows a specific example of the configuration of the temperature sensor element 10, in which (a) is a perspective view, (b) is a view seen from the back side of (a), and (c) is a view of (i). ) X direction (air blowing direction)
This is a diagram seen from. Thus, the PTC thermistor 10a is soldered and fixed to the electrode 310d formed on one surface of the substrate 10c on which the microheater 10b is formed, and the lead wire 10e is taken out from the electrode 10d.

On the other hand, FIG. 4 shows an example of the circuit configuration of the air temperature control device. Fourth
In the figure, a heater 7 is connected in series with a phase control element 14 such as a triac, and is connected to a commercial power source 17 via a switch 8 and a noise prevention coil 23.
PTC of temperature sensor element 10 in parallel with phase control element 14
A series circuit of a thermistor 10a and a capacitor 16 is connected, and a connection point between the PTC thermistor 10a and the capacitor 16 is connected to the gate of the phase control element 14 via a bidirectional switching element 15 such as an SBS. Further, the series circuit of the micro heater 10b of the temperature sensor element 10 and the variable resistor 9 is connected in parallel with the series circuit of the heater 7 and the phase control element 14, and the amount of current to the micro heater 10b is controlled by adjusting the variable resistor 9. Variable PTC thermistor 10a
It is now possible to add a temperature difference to the wind temperature.

Note that 18 and 19 are diodes, 20 is a resistor, and 27 is a capacitor for noise prevention. The fan rotation motor 5 is connected between the DC terminals of the diode bridge 21 via noise prevention coils 24 and 25, and the heater 7 is connected to the AC terminal ζ of the diode bridge 21 via a resistor 22.
, are connected in parallel with the series circuit of the phase control element 14. Note that 26 is a capacitor for noise prevention.

Therefore, the wind temperature stabilization operation of this wind temperature control device (for example, when the wind temperature changes due to external factors such as ambient temperature or a decrease in air volume), the wind temperature increases → the temperature of the PTC thermistor IOa increases. →The resistance value of the PTC thermistor 10a increases →The conduction angle of the phase control element 14 decreases - The power of the heater 7 decreases, the wind power decreases, and conversely,
The air temperature decreases → The temperature of the PTC thermistor 10a decreases → The resistance value of the PTC thermistor 10a decreases The conduction angle of the one-phase control element 14 increases - The power of the heater 7 increases The air temperature increases... , maintained at a predetermined temperature.

Next, when setting the air temperature, the variable resistor 9 is operated. For example, when setting the air temperature low, the resistance value of the variable resistor 9 is decreased → the power of the micro heater 10b increases. →The temperature of PTC E meta 10a rises →P
The resistance value of the TC thermistor 10a increases, the conduction angle of the one-phase control element 14 decreases, and the power of the heater 7 decreases.
7m goes down... and so on. Conversely, if you want to set the air temperature high, you can increase the resistance value of the variable resistor 9, and the operation is as follows: Increase the resistance value of the variable resistor 9 → The power of the micro heater 10b decreases - PTC thermistor 10a temperature decreases → PTC thermistor 10a
The resistance value decreases → the conduction angle of the phase control element 14 increases → the power of the heater 7 increases → the air temperature increases...
bawl.

In this way, the air temperature can be set by heating the PTC thermistor 10a with the micro heater 10b and creating a temperature difference between the air temperature detected by the heater 7 and the temperature detected by the PTC thermistor 10a. , the set temperature can be varied over a wide range. In addition, PTC thermistor 10
Since changes in the air temperature are detected as usual in a, the air temperature control will not become unstable.

On the other hand, in this first embodiment, as shown in FIG.
The TC thermistor 10a and the micro-heater 10b are integrated to form a plate-shaped temperature sensor element 10, and the temperature sensor element 10 is arranged horizontally in the air blowing direction, so that the area of the PTC thermistor 10a is smaller than that of the micro-heater 10b. Therefore, the PTC thermistor 10a efficiently receives and takes away the amount of heat from the micro-heater 10b, and the area that directly receives the wind from the fan 4 is minimized, so the PTC thermistor 10a receives and takes away the heat from the micro-heater 10b. The advantage is that there is less chance of escape. Further, the substrate 10c to which the micro heater 10b and the PTC thermistor 10m are attached has a conductive plate (not shown) for wiring inside.
The lead 1lOe, which is attached from the electrode 10d for electrical connection, is also made of a material with low thermal conductivity, and its shape has a narrow constricted part Y as shown in Figure 3. Since the micro-heater 10b is provided with a small cross-sectional area, the heat from the micro-heater 10b is further prevented from escaping. In addition, the lead wire 10e
Since the lead wire 10e is mounted in an orientation that minimizes the area directly exposed to the wind (see Figure 3 (a) and (c)), the lead wire 10e is connected to the micro heater 10b. 1iil
It is possible to suppress heat radiation to oe and heat radiation from the lead wire 10e into the air.

Therefore, the heat transfer efficiency from the micro-heater 10b to the PTC thermistor 10a is improved, and the loss of heat to other parts can be reduced, so the power supplied to the micro-beater 10b can be reduced, and the variable resistor 9 can be used to perform a wide range of variable air temperature control.

Next, FIG. 5 shows a second embodiment of the present invention, which is the same as the first embodiment except that an enclosure 10g is provided only in the microheater 1ob portion of the temperature sensor element 10 to block wind. Similar to the example.

Therefore, in this second embodiment, the micro heater 10
Since the heat dissipation due to the wind from b is minimized,
This embodiment has the advantage that the microheater requires only about 173 electric power when the wind speed is 18 m/s compared to the embodiment shown in FIG. In addition, since the heat capacity of the temperature sensor element 10 itself becomes large, there is also the drawback that the response of the sensor for detecting the wind temperature becomes slow.

Therefore, in this second embodiment (the micro heater 10b
Since the electric power applied to the air can be made very small, a wide range of variable control of the air temperature can be performed using the variable resistor 9, which has a small allowable electric power.

(Effects of the Invention) As described above, the present invention includes a motor that drives a fan and a seven-wheel drive unit that heats the air blown out by the fan.
a phase control element that controls the phase of this heater; a PTC thermistor that detects the air temperature and controls the phase control element to keep the air temperature constant; and a variable setting of the detected temperature of the PTC thermistor. In the temperature control device for a warm air fan, the temperature variable setting means includes a micro-heater that heats the PTC thermistor, and a means for variably setting the amount of electricity supplied to the micro-heater; The PTC thermistor and the micro-heater are integrally bonded to form a plate, and the plane of the plate is arranged parallel to the air blowing direction, so that heat dissipation from the micro-heater due to the wind can be minimized. Hey, PT
C thermistor and microphone: The contact area with the heater is large and heat conduction is good, so the power applied to the micro heater can be reduced, and a variable resistor can be used to control the air temperature over a wide range. effective.

It also has the effect of reducing heat stress on Micro and Ichiya itself.

[Brief explanation of the drawing]

1 to 4 show a first embodiment in which the present invention is applied to a hair dryer, FIG. 1 is a mechanical configuration diagram, and FIG.
3 and 3 are detailed diagrams of the temperature sensor element, FIG. 4 is a circuit configuration diagram of the air temperature control device, FIGS. 5 and 6 are configuration diagrams of the temperature sensor element showing the second embodiment, and FIG. The figure shows the conventional air temperature HJe! It is a @path configuration diagram of the i device. 1...Main body, 2...Suction port, 3...
...Discharge port, 4...Fan, 5...Motor, 6...Circuit board, 7...Heater,
8... Switch, 9... Variable resistor,
10...Temperature sensor element, 10a...
PTC thermistor, 10b...micro heater,]OC...substrate, 104...electrode, 1
0e...Lead wire, 10f...Glass coat, 10g...Enclosure, 11...Heater board, 13...Power cord, 14...・Phase control element, 15... Bidirectional switch element, 16.
...Capacitor, 17...Commercial power supply Figure 3 procedure manual (self-sponsored) August 28, 1986

Claims (4)

[Claims] (1) A motor that drives a fan, a heater that heats the air blown by the fan, a phase control element that controls the phase of this heater, and a phase control element that controls the phase control element by detecting the air temperature. A temperature control device for a hot air fan, comprising a PTC thermistor that keeps the temperature constant, and a temperature variable setting means that variably sets the detected temperature of the PTC thermistor, the device comprising: a micro heater that heats the PTC thermistor; The variable temperature setting means is configured by means for variably setting the amount of electricity applied to the heater, and the PTC thermistor and the micro heater are integrally joined to form a plate shape, and the plane thereof is arranged parallel to the air blowing direction. A temperature control device for a hot air heater. (2) A micro-heater and a PTC thermistor are attached via a plate-shaped lead wire attached to a board for electrical connection, and the plane of the lead wire is arranged parallel to the air blowing direction. 2. The temperature control device for a warm air fan according to item 1. (3) A temperature control device for a hot air heater according to claim 2, wherein a constriction is provided at the base of the lead wire. (4) The temperature control device for an air warmer according to claim 1, further comprising an enclosure that covers a portion of the microheater other than the surface to be bonded to the PTC thermistor.