JPH05137613A - Portable hair dryer - Google Patents

Abstract

PURPOSE:To provide the title hair dryer, in which a detecting part for combustion temperature can be simply composed and catalytic combustion can be done under the stable control of a fuel. CONSTITUTION:A detecting part 11 for combustion temperature at a catalytic combustion part 10 is composed as follows, that is to say, a bimetal 22 made of two kinds of alloy metals, each of which has a thermal expansion coefficient differing each other and is stuck together, is spirally arranged around the catalytic combustion part 10. One end of the bimetal is fixed on a dryer main body 2 and the other end is mechanically shifted by heating due to the combustion of the catalytic combustion part 10. In relation thereto, a control part 12, which controls the amount of a fuel gas supplied from a gas bottle by controlling a control valve 17 for a nozzle 4 corresponding to the detection by the detecting part 11, is composed of a valve-opening and closing mechanism 23. The mechanism 23 controls the opening of the control valve 17 by a mechanical movement caused to the detecting part 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact and easy-to-use cordless hair dryer which uses catalytic combustion of liquefied petroleum gas such as butane gas as a heat source.

[0002]

2. Description of the Related Art Portable hair dryers, hair curlers and the like use a gas heating device such as a catalyst as a heat source, and as a means for detecting the combustion temperature of the combustion part, for example, it is disclosed in Japanese Patent Publication No. 3-21167. There was something that was done. FIG. 5 is a diagram showing the structure of the conventional combustion temperature detecting section. The burner tube 102 arranged in parallel to the catalyst carrier 101 is made of a high expansion material having an excellent heat-sensitive function. A rod 103, which is made of a low expansion material and serves as an adjusting device, is fitted inside the tube. This rod 10
3 is fixedly coupled to the base portion 102F of the burner tube 102, and both are configured as an inner and outer tube type heat detecting member.
One end of the rod 103 is attached to the lever 104. The lever 104 opens and closes the valve portion provided in the fuel supply passage of the nozzle 105 that ejects the fuel gas to the catalyst carrier 101. When the rod 103 expands and contracts, the lever 104 operates to open and close the valve portion. Is performed.

In the combustion temperature detector thus constructed, when the catalyst carrier 101 burns and the ambient temperature rises, the inner and outer tube type heat detecting members are activated, the rod 103 extends and the lever 104 moves to the nozzle 105. It swings in the direction of closing the valve to throttle the fuel supply. If the combustion is not sufficient, the rod 103 is shortened and swings in the direction to open the valve portion of the nozzle 105 to increase the fuel supply amount and raise the combustion temperature.

[0004]

As described above, the conventional device can control the gas flow rate in response to the temperature of the gas heating device such as a catalyst, and thus can provide a portable hair dryer having good combustion efficiency. However, since the temperature is detected in a part of the outer peripheral portion of the catalyst carrier, there is a problem that proper temperature control cannot be performed when uneven combustion occurs in the carrier cross section. Further, since the valve section is opened and closed by the function of the inner and outer tube type heat detection member, there is a problem that the structure becomes complicated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a portable hair dryer which can perform temperature control with high accuracy by a simple mechanism and can perform stable catalytic combustion.

[0006]

A portable hair dryer according to the present invention has a detection unit for detecting a combustion temperature in a catalytic combustion unit, in which a bimetal made by laminating alloys having different coefficients of thermal expansion is spiraled around the catalytic combustion unit. It is arranged in a circular shape, one end of which is fixed to the dryer main body, and the other end is mechanically displaced by heating by the combustion of the catalytic combustion part, and the opening of the control valve of the nozzle is controlled. The control unit that controls the amount of fuel gas supplied from the gas cylinder is configured by a valve opening / closing mechanism that controls the opening degree of the control valve by the mechanical displacement generated in the detection unit.

[0007]

According to the structure of the present invention, since the temperature is detected by the bimetal spirally arranged around the catalytic combustion portion, even if non-uniform combustion occurs inside the catalytic combustion portion The temperature detection biased to is not detected. In addition, since the bimetal is arranged in a spiral shape, the area heated by the combustion part becomes large, and when detecting the temperature change around the catalytic combustion part as the mechanical displacement of the bimetal, the mechanical displacement does not occur. The detection accuracy increases as the size increases.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing a configuration of a hair dryer 1 according to an embodiment of the present invention. A housing of a hair dryer main body 2 is made of a heat resistant molded product, and a fuel gas is provided inside the main body 2. The gas cylinder 3 to be housed, the nozzle 4 located at the outlet of the gas supply path from the gas cylinder 3, the air blower 6 for supplying air from the rear of the nozzle 4 to the warm air outlet 5, and the air blower 6
Pre-mixing section 7 for pre-mixing air and fuel gas blown by to form a mixed gas, pre-heating section 8 for heating the mixed gas mixed by this pre-mixing section 7 to a predetermined temperature, and this pre-heating section 8 Ignition unit 9 for igniting mixed gas with
A catalytic combustion part 10 for catalytically burning the mixed gas heated by the preheating part 8, a detection part 11 for detecting a temperature change in the catalytic combustion part 10, and the nozzle according to the detection by the detection part 11. The control unit 12 controls the opening / closing of the valve unit 4 to control the amount of fuel gas supplied from the gas cylinder 3.

The gas cylinder 3 is a container for storing liquefied petroleum gas such as propane and butane, and is fixed to or detachable from the main body 2. Nozzle 4 is gas cylinder 3
The fuel gas, which is provided at the end of the relay pipe 16 to which the liquefied gas therein is supplied and vaporized and gasified in the relay pipe 16, is injected from the fuel gas ejection holes 4 a to the premixing unit 7 at an appropriate speed. The supply amount of the fuel gas is controlled by the control valve 17 provided in the central portion of the nozzle 4. Also, the small hole 4a
A flame combustion cylinder 18 is installed in association with the fuel gas ejected from the flame combustion cylinder 18, and a plurality of small holes 18a are provided in the outer peripheral portion of the flame combustion cylinder 18.

The blower unit 6 comprises a fan 6a and a fan driving motor 6b and sends a required amount of air to the premixing unit 7.
The premixing unit 7 is a unit that mixes gas and air into a mixed gas having a constant ratio. The preheating portion 8 is a portion that heats the mixed gas to a predetermined temperature in order to promote catalytic combustion, and a mesh net 19 made of a breathable heat conductor that covers the outlet of the flame combustion cylinder 18. It is composed of.

The ignition section 9 comprises a piezoelectric device 9a and an electrode 9b. The other electrode of the electrode 9b (a partner of spark discharge)
Corresponds to the outer peripheral portion of the flame combustion cylinder 18. The catalytic combustion unit 10 is composed of a catalytic unit 20 in which a porous ceramic or metal such as a honeycomb or a foam is used as a carrier and platinum, palladium, or the like is carried. One end of the detection unit 11 is the main body 2
Fixed to a part of, by means such as adhesion or caulking,
For example, a low-expansion heat-sensitive member made of an alloy such as a 36% Ni-Fe material and a high-expansion heat-sensitive member such as a 100% Cu material are bonded together, and the bimetal 22 spirally arranged around the catalyst portion 20 is used as a heat-sensitive member. It is configured. FIG. 2 is a perspective view showing an arrangement state of the detection unit 11 and the catalyst unit 20, with the low expansion heat sensitive member on the catalyst unit 20 side and the high expansion heat sensitive member on the main body 2 side.

The control unit 12 is attached to the other end of the bimetal 22 constituting the detection unit 11, rotates the control valve 17 of the nozzle 4 according to the expansion and contraction of the bimetal 22, and operates the lever 23 as a valve opening / closing mechanism. It is composed of. Reference numeral 13 is a storage battery that supplies power to the blower unit 6, and 14 is an electric circuit for controlling rotation of the motor 6b and charging.

Reference numeral 25 is an operation switch of the hair dryer. A shield plate 26 protects the main body 2 from the radiant heat of the catalytic combustion unit 10. Next, the operation of the embodiment configured as described above will be described. First, when the operation switch 25 is started to be pressed, the fuel gas flows from the gas cylinder 3 into the relay pipe 16. The control valve 17 of the nozzle 4 is in an open state, and the fuel gas is ejected from the fuel gas ejection small hole 4a of the nozzle 4. At this time, the motor 6b rotates at a low speed according to a command from the control electric circuit 14 and sends a small amount of wind to the outer peripheral portion of the premixing unit 7. Since the flame combustion cylinder 18 is located on the windward side of the motor 6b,
Almost no wind is blown into the flame burning cylinder 18. When the operation switch 25 is further pressed, the piezoelectric device 9a operates, and spark discharge is generated between the electrode 9b and the outer peripheral portion of the flame combustion cylinder 18,
Flame combustion starts inside the flame combustion cylinder 18. In the premixing section 7, there is a certain amount of air velocity, so flame combustion does not occur. Two
Reference numeral 8 indicates a flame that becomes a fire source.

The thermal energy generated by the flame combustion is transferred to the preheating net 19 and heats the mixed air approaching the premixing section 7. The mixed gas heated to about 200 degrees Celsius or higher starts catalytic combustion in the catalytic combustion unit 10. At this time, the motor 6b gradually shifts to full speed rotation according to a command from the control electric circuit 14, and starts to send a steady wind to the outer peripheral portion of the premixing unit 7. The thermal energy generated by the catalytic combustion is used to heat the air blown to the outside of the main body 2.

The bimetal 22 which constitutes the detector 11 is
The radiant heat from the catalytic combustion unit 10 expands in the direction of arrow Q as shown in FIG. In the case of this embodiment, when the temperature is increased to 170 ° C. by winding three times with a thickness of 0.5 mm and a diameter of 35 mm, it is rotationally extended by about 15 degrees. For example, in FIG. 4, which shows changes in the catalyst portion temperature, the fuel injection amount, and the bimetal displacement amount over time, the temperature of the catalyst combustion portion 10 is T
When the temperature rises to 1 ° C. and exceeds a predetermined temperature, the bimetal 22 correspondingly extends from the position shown by the solid line in FIG. 3 to the state of the imaginary line. At this time, the lever 23 is also displaced to the state of the imaginary line, and the control valve 17 of the nozzle 4 is rotated in the direction of squeezing to reduce the fuel injection amount. In addition, the catalytic combustion unit 1
When the temperature of 0 falls below a predetermined temperature, the bimetal 22 shortens and the amount of fuel injection increases due to the reverse operation.
It is possible to realize a stable combustion state as shown in.

When the operation is stopped, the operation switch 25 is pushed again to stop the supply of the fuel gas and the electric current. As described above, in the above-described embodiment, since the detection unit 11 is configured by using the bimetal 22 spirally arranged around the catalytic combustion unit 10 as the heat-sensitive member, the structure is simplified and the surroundings of the catalytic combustion unit 10 are provided. Since the temperature is detected by the heat-sensitive member that surrounds the spiral shape, even if uneven combustion occurs inside the catalytic combustion unit 10, partial temperature detection is not performed and stable fuel adjustment is performed. Catalytic combustion can be performed. Further, since the bimetal 22 is arranged in a spiral shape, the area heated by the catalytic combustion unit 10 becomes large, and when detecting a temperature change around the catalytic combustion unit 10 as a mechanical displacement of the bimetal, The displacement is increased and the detection accuracy can be improved. Also,
The bimetal 22 itself can also serve as a heat shield.

In the above embodiment, the preheating net 19 is used.
When a catalyst such as platinum or palladium is carried on the mesh surface of, the catalytic oxidation reaction partially starts in the preheating stage of the mixed gas and the heating of the mixed gas is promoted. It can be done faster and more efficiently. Further, in this embodiment, the heat source of the preheating section 8 is the flame combustion flame 28, but this flame may be extinguished at the stage of transition to catalytic combustion as in the conventional example, and heating of the mixed gas in that case. Is carried out by a preheating net 19 carrying a catalyst.

[0018]

According to the portable hair dryer of the present invention, since the temperature is detected by the bimetal spirally surrounding the catalytic combustion portion, the combustion temperature detecting portion can be simply constructed, and the inside of the catalytic combustion portion can be easily constructed. Even if non-uniform combustion occurs, partial temperature detection is not performed, and catalytic combustion can be performed under stable fuel adjustment.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a main part of the embodiment.

FIG. 3 is a cross-sectional view showing a case when viewed from the front side in FIG.

FIG. 4 is a graph showing changes in the temperature of the catalyst portion with time.

FIG. 5 is a partial cross-sectional view showing a configuration of a conventional example.

[Explanation of symbols]

 1 Hair Dryer 2 Main Body 3 Gas Cylinder 4 Nozzle 6 Blower Part 7 Premixing Part 8 Preheating Part 9 Ignition Part 1 0 Catalytic Combustion Part 1 1 Detection Part 1 2 Control Part 1 7 Control Valve 2 2 Bimetal 2 3 Lever (valve opening / closing mechanism)

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[Procedure amendment]

[Submission date] February 7, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

In the combustion temperature detecting portion configured as described above, when the catalyst carrier 101 burns and the ambient temperature rises, the inner and outer tube type heat detecting members operate, the burner tube 102 extends, and the lever 104 and the nozzle 105. Direction of closing valve part of (arrow
The fuel supply amount is reduced by rocking in the direction indicated by the mark X) . When the combustion is not sufficient, the burner tube 102 is shortened to open the valve portion of the nozzle 105 (the direction indicated by the arrow X ′).
Swings direction) to increase the combustion temperature to increase the supply amount of the fuel.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction content]

Bimetal 22 that constitutes the detection unit 11
Is expanded in the direction of arrow Q as shown in FIG. 3 by the radiant heat from the catalytic combustion unit 10. In the case of this embodiment, when the temperature is increased to 170 ° C. by winding three times with a thickness of 0.5 mm and a diameter of 35 mm, it is rotationally extended by about 15 degrees. For example, in FIG. 4, which shows changes in the catalyst portion temperature, the fuel injection amount, and the bimetal displacement amount with the passage of time, when the temperature of the catalytic combustion portion 10 rises to T1 ° C. and exceeds a predetermined temperature, the bimetal is correspondingly changed. 22 bends from the position shown by the solid line in FIG. 3 to the state of the imaginary line. At this time, the lever 23 is also displaced to the state of the imaginary line, and the control valve 17 of the nozzle 4 is rotated in the direction of squeezing to reduce the fuel injection amount. Further, when the temperature of the catalytic combustion unit 10 falls below a predetermined temperature, the bimetal 22
Since the amount of fuel injection is increased by the bending motion in the opposite direction, a stable combustion state as shown in FIG. 4 can be realized.

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (1)

[Claims] 1. A gas cylinder containing a fuel gas, a nozzle for ejecting the fuel gas supplied from the gas cylinder while adjusting the flow rate by opening and closing a control valve, a blower section for blowing air from the rear of the nozzle, A premixing unit that mixes the air blown by the blower unit and the fuel gas in advance to form a mixed gas, a preheating unit that heats the mixed gas mixed by the premixing unit to a predetermined temperature, and a heating unit that heats the preheating unit. From the gas cylinder by controlling the opening and closing of the control valve of the nozzle in response to the detection by the catalytic combustion unit that catalytically burns the mixed gas, the combustion temperature in this catalytic combustion unit, and the detection in this detecting unit. A portable hair dryer comprising a control unit for controlling the fuel gas supply amount of, wherein the detection unit is a bimetal formed by laminating alloys having different thermal expansion coefficients. A spiral arrangement is provided around the medium combustion section, one end of which is fixed to the dryer main body, and the other end is mechanically displaced by heating by combustion of the catalytic combustion section. A portable hair dryer having a valve opening / closing mechanism that controls the opening of the control valve by a mechanical displacement of the detection unit.