JP3500704B2 - Portable hair dryer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact and easy-to-use cordless hair dryer using a catalytic combustion of a liquefied petroleum gas such as butane gas as a heat source. 2. Description of the Related Art Conventionally, in a hot air blower for burning gaseous fuel or vaporized liquid fuel and exchanging heat of the exhaust gas with a heat exchanger to take out hot air, all of the gaseous fuel or petroleum fuel is used as a hot air blower. The flame is formed in the mouth plate and burned. Therefore, in order to form a flame, a combustion chamber having a space corresponding to the flame is required. In other words, excessive compaction may cause incomplete combustion and emit carbon monoxide and unburned hydrocarbons. Therefore, a portable hair dryer having a structure as shown in FIG. 8 has been devised. In FIG. 8, 1 is a blower, 2 is a wind tunnel section, 3 is a combustor, and 4 is a piezoelectric igniter.
The combustor 3 is provided with a cover 5. A fuel inlet 6 is provided at the rear end of the combustor 3, a fuel-air mixer 7 is provided at the inlet side of the fuel inlet 6, and a catalyst layer 8 is provided at an outlet end of the combustor 3. Fuel-air mixer 7 in combustor 3
The piezoelectric igniter 4 is disposed between the igniter and the catalyst layer 8.
This piezoelectric igniter 4 is connected to an ignition switch 10. [0004] In the combustor 3, a mixed gas in which a fuel gas such as liquefied petroleum gas injected from the fuel inlet 6 and a part of the air blown by the blower 1 are mixed by a mixer 7 is burned. . That is, this mixed gas is supplied to the piezoelectric igniter 4
It is ignited and burns. The burning mixed gas passes through the catalyst layer 8, passes through the outside of the combustion chamber in which the combustor 3 is installed, and is mixed with air blown by the blower 1,
It is discharged from the discharge port 9 attached to the exit of the wind tunnel 2. At this time, when the combustion gas passes through the catalyst layer 8, the unburned gas is completely burned, and the amount of carbon monoxide / hydrocarbon becomes extremely small. [0005] The hair dryer of the above-mentioned conventional construction has the following problems. First, there is a danger that the flame may be released from the discharge port 9 due to the adoption of flame combustion. Second, the direction of combustion is limited, making it unsuitable for use in various directions. The present invention has such a conventional configuration.
In the direction of use without flame
To provide an unlimited and safe portable hair dryer
When, also, mixing a portion of the wind blower mixed gas supplied to the catalyst, to adjust the excess air ratio of the mixture gas the temperature of the catalyst was reasonably held, portable hair dryer with excellent safety and durability it is an object and provide child a. [0007] SUMMARY OF THE INVENTION The above present onset Ming means to an end of the gas cylinder to accommodate the fuel gas
And the fuel gas supplied from this gas cylinder
Spouting while adjusting the flow rate by adjusting the opening area
Nozzle and blow air from behind this nozzle
A blowing section, a mixing section for mixing air and fuel gas, and air
A combustion chamber for burning air-fuel mixture of fuel gas, the catalytic combustion portion
With the door, the provided substantially conical guide tube to the outlet of the combustion chamber, the catalytic combustion portion disposed guide tube opening opposite the combustion chamber, wherein the guide tube sidewall mix in accordance with the air volume Gas
A portable hair dryer provided with a plurality of air intakes for controlling an air ratio . According to the above means of [0008] the present invention, after the start of flame combustion
Activate the blower to allow the catalyst layer to reach the catalytic combustion temperature.
From the combustion of the catalyst by increasing the excess air ratio of the mixed gas from
Shift to combustion only, safe and easy to use
It acts as a portable hair dryer. Moreover, guide tube provided at the outlet of the combustion chamber is provided with a plurality of air intake, to control the air ratio of the gas mixture in accordance with the air volume, to hold the temperature of the catalyst layer at an appropriate temperature, An object of the present invention is to realize a safe portable hair dryer which has excellent durability and does not have an abnormally high temperature of hot air. A first embodiment of the present invention will be described below. FIG. 1 is a sectional view showing the overall configuration of the present embodiment. The housing 11 of the portable hair dryer is made of metal having excellent heat resistance and includes the following components. 12 is propane
A gas cylinder containing a fuel gas such as liquefied petroleum gas such as butane, which is fixed to or removable from the main body 11. A nozzle 13 is disposed at an outlet of a supply path of the gas supplied from the gas cylinder 12. Gas cylinder 12
A control valve 14 is provided between the control valve 14 and the nozzle 13. The control valve 14 is, as shown in FIG.
a, throttle rod 14b, seal ring 14c, throttle opening 14d
When the user rotates the control lever 14a, the supply amount of the fuel gas can be controlled.
That is, if the control lever 14a is rotated, the aperture bar 14b
Moves to change the opening area of the aperture 14d. [0011] Behind the nozzle 13, there is provided a blower 16 for supplying air to the hot air outlet 15. The blower 16 includes a fan 16a and a fan drive motor 16b. The fuel gas ejection holes 13 a provided at the tip of the nozzle 13 inject the fuel gas, which is obtained by gasifying the liquefied gas in the gas cylinder 12 in the relay pipe 21, into the mixing unit 17 at an appropriate speed. Mixing section 17
Is a portion that mixes gas and air into a mixed gas at a fixed ratio. A combustion chamber 19 is provided in association with fuel gas ejected from the small holes 13a.
The tip of the nozzle 13 is disposed in a mixing unit 17 that mixes the air blown by the blowing unit 16 with the fuel gas to form a mixed gas. The mixing section 17 is connected to a combustion chamber 19 for burning a mixed gas. Combustion chamber 1
In the vicinity of 9, an ignition section 18 for igniting the mixed gas is provided. The ignition section 18 includes a piezoelectric device 18a and an electrode 18b. The outer periphery of the combustion chamber 19 corresponds to the other electrode with respect to the electrode 18b. The combustion chamber 19 is connected to a catalytic combustion section 20, and a catalyst layer 20 a is provided at a tip of the catalytic combustion section 20. As shown in FIG. 2, the catalytic combustion section 20 includes a catalyst layer 20a and a catalyst layer 20a.
And a holding bracket 20c for fixing the catalyst layer 20a. Catalyst layer 20a
Is formed by using a porous ceramic or metal such as a honeycomb or a foam as a carrier and carrying platinum, palladium or the like. Reference numeral 22 denotes a storage battery that supplies power to the blower unit 16, and supplies power to the fan drive motor 16 b via an operation switch 23. The operation of this embodiment will be described below. When the user rotates the control lever 14 a, the fuel gas flows out of the gas cylinder 12 and blows out from the small hole 13 a of the nozzle 13 via the relay pipe 21. The jetted fuel gas flows into the mixing section 17 while entraining the surrounding air. The mixed gas mixed with the air in the mixing section 17 flows into the combustion chamber 19. Here, when the piezoelectric device 18a is operated, spark discharge occurs between the electrode 18b and the outer peripheral portion of the combustion chamber 19, and flame combustion starts inside the combustion chamber 19.
By this flame combustion, the catalyst layer 20a of the catalytic combustion section 20 provided at the outlet of the combustion gas is heated, and the catalyst layer 20a
Rise instantaneously and reach 200 ° C. or more. When the operation switch 23 is turned on in this state, the driving motor 16
b rotates and the fan 16a starts blowing. Fan 1
The amount of air flowing into the mixing section 17 increases due to the air blow of 6a, and the excess air ratio to the mixed gas increases. As a result, the flame combustion in the combustion chamber 19 cannot be maintained, and the high-temperature mixed gas in a state where the flame is extinguished becomes the catalyst layer 2
0a. At this time, the temperature of the catalyst layer 20a is 20
Since the temperature is 0 ° C. or higher, flame combustion shifts to catalytic combustion. This combustion gas is mixed with the wind from the blower 16 and is blown out from the hot-air blowout port 15. When the operation is stopped, the control valve 14 is closed by turning the control lever 14a in the reverse direction, and the operation switch 23 is turned off.
And stop the ventilation. As described above, according to the present embodiment, the blowing section is operated after the start of flame combustion, and after the catalyst layer reaches the catalytic combustion temperature, the excess air ratio of the mixed gas is made thinner than the flame-combustible area. Therefore, the flame can be extinguished and only the catalytic combustion can be performed. In addition, since there is no restriction on the combustion direction, it can be used in various directions. Next, a first embodiment of the present invention will be described with reference to FIG.
Explanation will be given based on FIG. Overall structure of the present embodiment are the same as those described in FIG. 1 will not be described. FIG.
4 is a bimetal switch provided in the catalyst layer case 20b. The power of the storage battery 22 is supplied to the fan drive motor 16
b. [0017] The operation of following the present reference example will be described. By rotating the control lever 14a, flame combustion is started in the combustion chamber 19 in the same manner as in the first embodiment. The heat energy generated by the flame combustion heats the catalyst layer 20a of the catalytic combustion section 20 provided at the outlet of the combustion gas.
As a result, the temperature of the bimetal attached to the catalyst layer case 20b rises due to heat conduction, and the bimetal is bent. When the temperature of the catalyst layer 20a becomes 200 ° C. or higher in this way, the contact of the bimetal switch 24 closes and the fan 1
Power is supplied from the storage battery 22 to 6a. Thus, the fan 16a starts rotating, and the blower 16 starts blowing. When the blowing is started, the amount of air flowing into the mixing section 17 increases, the excess air ratio increases, and the flame combustion cannot be maintained, and the flame is extinguished. The mixed gas in the flameless combustion state is the catalyst layer 20.
When supplied to a, the temperature of the catalyst layer 20a is 200 ° C. or higher, so that the combustion immediately shifts to catalytic combustion. The combustion gas from the catalytic combustion is mixed with the air from the blower 16 and is blown out from the hot air blowout port 15. When the operation is stopped, the control lever 14a is rotated in the opposite direction to close the control valve 14, as in the above embodiment. When the control valve 14a is closed, the supply of the mixed gas is stopped. As a result, the temperature of the catalyst layer 20a is lowered, and the temperature of the bimetal attached to the catalyst layer case 20b is lowered, so that the original shape is restored. Thus, the contact of the switch 24 is opened, the power supply to the driving motor 16b is stopped, and the air blowing is automatically stopped. According to the present embodiment as described above, by providing a bimetal in the vicinity of the catalytic combustion portion 20, so that to operate the blower by detecting the temperature rise of the catalyst layer 20a by heating of the combustion gas Therefore, it is possible to automatically and safely shift to catalytic combustion. FIG. 5 shows a second embodiment of the present invention.
It will be described based on. Reference numeral 25 denotes a positive temperature coefficient thermistor provided in the catalyst layer case 20b. The power supply of the storage battery 22 is connected to the fan driving motor 16b via the PTC thermistor switch 25. That is, the fan drive motor 1 is controlled by the resistance value of the PTC thermistor 25.
The configuration is such that the amount of air blown can be changed by controlling the current supplied to 6b. [0021] The operation of following the present reference example will be described. By rotating the control lever 14a, flame combustion is started in the combustion chamber 19. The heat energy from the flame combustion heats the catalyst layer 20a of the catalytic combustion section 20 provided at the outlet of the combustion gas. Due to this heat conduction, the catalyst layer case 2
The temperature of the positive temperature coefficient thermistor 25 attached to Ob also rises. As the temperature of the positive temperature coefficient thermistor 25 increases, the resistance value decreases, and the current supplied to the fan driving motor 16b increases. For this reason,
The amount of air blown from the air blower 16 also increases. When the temperature of the catalyst layer 20a becomes 200 ° C. or higher, the amount of air blows increases, so that combustion in the combustion chamber 19 changes to flameless combustion. Thus, in the same manner as in each of the above embodiments, catalytic combustion is performed in the catalyst layer 20a. The combustion gas from the catalytic combustion is mixed with the air from the blower 16 and is blown out from the hot air blow-out port 15. When the temperature of the catalyst layer 20a further rises and the temperature of the warm air rises, the PTC thermistor 25
It operates to lower the temperature of a. That is, the resistance value of the positive temperature coefficient thermistor 25 further decreases, and the current supplied to the fan driving motor 16b increases.
The amount of air blown by the air blowing unit 16 is increased, so that the heat of the catalyst layer 20a is deprived, and the catalytic combustion heat energy and the amount of air blow are balanced. In this way, warm air at an appropriate temperature is stably blown out. When the operation is stopped, the control lever 14a is rotated in the opposite direction to close the control valve 14 and the supply of the mixed gas is stopped, as in the above embodiment and the reference example . When the supply of the mixed gas is stopped, the temperature of the catalyst layer 20a drops, the resistance value of the positive temperature coefficient thermistor 25 increases, the current supplied to the fan drive motor 16b decreases, and the air blowing automatically stops. Is what is done. According to the present embodiment as described above, the PTC thermistor 25 provided in the vicinity of the catalytic combustion portion 20, the blower unit 16 detects the temperature of the catalyst layer 20a by heating of the combustion gas
Since the amount of air blown is controlled, the temperature of the catalyst is maintained at an appropriate temperature and stable catalytic combustion can be maintained. [0025] Next, a second embodiment of the present invention, FIG. 6
Explanation will be given based on FIG. In this embodiment, the combustion chamber 19
Is provided with a substantially conical guide cylinder 26 having a plurality of air intake ports 26a. Other configurations are the same as those of the second embodiment of the present invention. The operation of this embodiment will be described below. The ginseng for process in which combustion in the combustion chamber 19 goes to flameless combustion from the flame combustion, catalytic combustion takes place in the catalyst layer 20a
Considered are the same as those in the example. The combustion gas generated by the catalytic combustion is mixed with the air blown from the air blower 16 and blown out from the hot air outlet 15. At this time, when the temperature of the catalyst layer 20a further rises and the temperature of the warm air rises, the resistance value of the positive temperature coefficient thermistor 25 decreases and the amount of air blown from the blower unit 16 increases. A part of this air blow is
6 is guided into the guide cylinder 26 from an air intake port 26a provided on the surface of the guide cylinder 6. Therefore, the combustion chamber 19
Is mixed with the air to be further diluted. Therefore, the mixed gas supplied to the catalyst layer 20a has a lower concentration, and the catalytic combustion amount is reduced. Thus, the temperature of the catalyst layer 20a also decreases. Eventually, the catalytic combustion heat energy and the amount of air are balanced, so that warm air at an appropriate temperature is stably blown out. As described above, according to this embodiment, the air ratio of the mixed gas can be controlled in accordance with the amount of air blow, the temperature of the catalyst layer can be maintained at an appropriate temperature, the durability is excellent, and the hot air This realizes a safe portable hair dryer in which the temperature of the hair does not become abnormally high. [0028] According to the present invention as described above, according to the present invention, not out flames
Real safe portable f Adoraiya no restrictions on the use direction
It is a manifestation. Further, mixing a portion of the wind blower mixed gas supplied to the catalyst, to adjust the excess air ratio of the mixture gas the temperature of the catalyst was reasonably held, portable hair with excellent safety and durability This realizes a dryer.

First BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view Figure 2 cross sectional view of the portable hair dryer portable hair dryer in the first embodiment of the present invention [3] The present invention FIG. 4 is a cross-sectional view of a main part of the portable hair dryer in the reference example of FIG. 4. FIG. 5 is a cross-sectional view of a main part of the portable hair dryer in the second reference example of the present invention. FIG. 7 is a sectional view of a main part of the portable hair dryer according to the second embodiment of the present invention. FIG. 8 is a sectional view of a main part of the conventional portable hair dryer. Gas cylinder 13 Nozzle 14 Control valve 16 Blower 17 Mixer 19 Combustion chamber 20 Catalytic combustor 20a Catalyst layer 24 Bimetal switch 25 Positive thermistor 26 Induction cylinder 26a Air intake

Continuation of the front page (56) References JP-A-6-133816 (JP, A) JP-A-6-105710 (JP, A) JP-A-5-322136 (JP, A) JP-A-5-231622 (JP) JP-A-5-137614 (JP, A) JP-A-5-137613 (JP, A) JP-A-5-137612 (JP, A) JP-A-4-270806 (JP, A) 5-90121 (JP, U) JP 5-90120 (JP, U) JP 2-20885 (JP, B2) JP 4-33764 (JP, Y2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) A45D 20/06

Claims (1)

(57) [Claim 1] A gas cylinder containing fuel gas and
The fuel gas supplied from the gas cylinder is controlled by the opening area of the control valve.
By adjusting the flow rate while adjusting the flow rate.
A blower that blows air from behind the nozzle and the nozzle
And a mixing section for mixing air and fuel gas, and air and fuel gas.
Equipped with a combustion chamber for burning a mixed gas of
For example, the the outlet of the combustion chamber provided with a substantially conical guide tube, the catalytic combustion portion disposed guide tube opening opposite the combustion chamber,
The air ratio of the mixed gas on the side wall of the guide cylinder according to the amount of air blown
A plurality of air intakes to set digit portable hair dryer to control.