JPH0749885B2 - Portable air heater - Google Patents

Description

TECHNICAL FIELD The present invention utilizes a gas heat source and is suitable for drying hair, clothes, or hair of pets such as dogs and cats. Regarding

[Background technology]

Portable hot air blowers have various uses such as drying of hair and clothes at beaches and campsites, and drying of pet body hair. When a battery is used as the heat source of the portable air heater, the amount of heat that can be taken out is very small in a battery having a weight and size that can be carried. Therefore, it is inappropriate to use the battery as a heat source for a portable air heater. Therefore, liquefied petroleum gas was found, which is portable and has a sufficient amount of warm air to be carried.
In fact, a portable dryer (Japanese Utility Model Publication No. 45-28331) has been devised in which the liquefied petroleum gas is blown while being blown to obtain warm air. This portable dryer is shown in FIG. As shown in the figure, this portable dryer
A wind tunnel 51 is formed in front of the wind direction of
A combustion chamber 52 is provided on the lower surface side of the. A gas burner 53 is arranged in the combustion chamber 52. This gas burner
At 53, the fuel gas in the fuel gas tank 54 is burnt, and the flame heats the upper surface of the combustion chamber 52 or the lower surface of the wind tunnel 51. Then, the air blown by the blower device 50 is heated from the lower surface of the wind tunnel 51 and forcedly blown out from the tip of the wind tunnel 51. Air is supplied to the gas burner 51 from an intake hole 55 on the lower surface of the combustion chamber 52. In the figure, 56 is an ignition heater that ignites the gas burner 53, 57 is a battery that serves as a power source for the air blowing means 50 and the ignition heater 56, and 58 is a switch unit that turns on and off the air blowing means 50 and the ignition heater 56. The switch unit 58 is equipped with a gas supply control valve.

However, since this portable dryer burns with flames, it is easy to be extinguished by the air blown from the blowing means, etc., and toxic exhaust gas due to incomplete combustion is easily generated, and furthermore, temperature control is difficult and It has the drawback of being dangerous.

The inventor, in order to overcome the drawbacks of this portable dryer,
Repeated research. As a result, we have developed a portable air heater equipped with a catalytic combustion type combustion means, which is hard to be extinguished by wind, generates little toxic exhaust gas, and is relatively easy in temperature control. However, such a catalytic combustion type combustion means has a problem that the combustion startup after ignition is often delayed because the mixing ratio of fuel gas (usually liquefied petroleum gas) and air is relatively lean. It was Therefore, there has been a problem in putting a catalytic combustion type portable air heater into practical use.

[Object of the Invention]

The present invention has been made in view of such circumstances, and can generate a large amount of heat energy, the combustion is less likely to be hindered by wind, the generation of toxic exhaust gas is small, and the temperature control is also possible. It is an object of the present invention to provide a portable air heater which is relatively easy and has a short combustion rise time after ignition.

[Disclosure of Invention]

In order to achieve the above-mentioned object, the present invention provides an air blowing unit, a catalytic combustion type combustion unit that heats air sent by the air blowing unit, an ignition unit that ignites the combustion unit, and the air blowing unit. A portable air blower provided with a power supply for supplying power to the combustion means and the ignition means, and a fuel gas tank for supplying a fuel gas to the combustion means, wherein the blowing means initially reduces the blowing amount at the start of use. However, the gist is a portable air heater characterized by being connected with an air volume control means for increasing the air volume to a predetermined air volume during steady operation.

The present invention will be described in detail below.

FIG. 1 shows a portable warm air heater according to the present invention.
As shown in the figure, in this portable warm air heater, a main body 9 includes a wind tunnel portion 10 and a handle portion 11. The main body 9 is made of a highly heat resistant molded product. A fuel gas tank 5 and a battery storage chamber 12 are provided inside the handle portion 11, and a switch 14 is provided on the wall portion. The fuel gas tank 5 has a refill port
20 is provided, and a refueling gas cylinder 21 is connected to the refueling gas cylinder 21 so that fuel gas such as liquefied petroleum gas is replenished. The storage chamber 12 is provided with a + terminal 22 and a − terminal 23, and the battery 4 as a power source is stored therein. An openable / closable battery lid 13 is provided so that the battery 4 can be replaced from here. The switch 14 is connected to a switch contact 15 and a gas on-off valve 16 that operate in conjunction with each other. Inside the wind tunnel portion 10, a blower unit (blower mechanism) 1, a combustion unit (combustion unit) 2 and an ignition unit (ignition device) 3 are provided. In the blower unit (blower unit) 1, a motor 18 is provided with a fan 19, and a rectifying blade 24 is provided around the motor 18. Then, the air is sucked from the suction port 25 provided at the rear end of the wind tunnel 10 to blow air. As shown in FIG. 2, the motor 18 has a positive terminal via a negative characteristic thermistor 31.
22 (+ pole of battery 4) is electrically connected, and − terminal 23 via switch contact 15 (switch 14)
It is adapted to be electrically connected to the (negative pole of the battery 4) so that the battery 4 supplies power to the motor 18. In the combustion means 2, the ceramic catalyst 7 is provided with a cover 26, and is fixed to the wind tunnel portion 10 by a net 28. The ceramic catalyst 7 is a honeycomb type ceramic body having a large number of vent holes 6 and a catalyst such as platinum supported on the ceramic body. The cover 26 is tubular and has a smaller diameter toward the rear,
A narrow inlet 27 is provided at the rear end. And the catalyst 7
It is fixed to the rear end of the rear end, and the mixing chamber 8 is formed at the inlet thereof. By forming the inlet 27 to be narrow, only a part of the air blown by the air blower 1 can be taken into the mixing chamber 8. The amount of air flowing into the mixing chamber 8 is determined by the opening area of the inlet 27. A gas nozzle 17 at the tip of a gas conduit 36 introduced from the fuel gas tank 5 via the gas on-off valve 16 is opened at the inflow port 27. An ignition means (ignition heater) 3 is arranged in the mixing chamber 8, and the ignition means 3 has a + terminal.
The battery 4 is electrically connected directly to 22 and is electrically connected to the negative terminal 23 via the switch contact 15, so that the battery 4 supplies power to the ignition means 3. The combustion means 2 mixes the fuel gas such as liquefied petroleum gas injected from the gas nozzle 17 and a part of the air blown by the air blower 1 in the mixing chamber 8, and the mixed gas passes through the catalyst 7. While passing through the pores 6, catalytic combustion is performed. The thermistor 31 is used as an air volume adjusting means, and is connected to the motor 18 in series as described above, and is connected to the wind tunnel.
It is arranged in the warm air discharge port in front of the combustion means 2 in 10.
The switch 14 is configured to slide in two steps. When the switch 14 is slid one step in the direction of the arrow at the position shown in the drawing, the gas on-off valve 16 is opened and the contact of the switch contact 15 on the ignition motor 3 side is changed. It is in the ON state. When the valve is further slid in the direction of the arrow, the contact of the switch contact 15 on the ignition means 3 side is turned off and the contact of the motor 18 is turned on while the gas on-off valve 16 is kept open. When the switch 14 is returned to its original position, the gas on-off valve 16 closes and the switch contact 15
The contacts on the ignition means 3 side and the motor 18 side are turned off. A discharge nozzle 29 is attached to the tip discharge port of the wind tunnel section 10. A discharge opening lattice 30 is provided inside the discharge nozzle 29 so that a finger or the like cannot be inserted inside.

This portable air heater operates as follows. That is, first, the switch 14 is slid one step in the direction of the arrow. Then, the gas is sent from the fuel gas tank 5 through the gas conduit 36 to the gas nozzle 17, and is injected from there. On the other hand, the battery 4 supplies electricity to the ignition means 3 through the switch contact 15 and the ignition means 3 becomes red. At the start of combustion (immediately after ignition), only gas is supplied, and the ignition means 3 starts rapid rising combustion. About this state
After holding for 10 seconds, switch 14 is further slid in the direction of the arrow. Then, gas is continuously ejected from the gas nozzle 17, and the battery 4 supplies power to the motor 18 through the switch contact 15 to rotate the fan 19. Then, the gas and a part of the air blown by the fan 19 are mixed in the mixing chamber 8, and the mixed gas causes a catalytic combustion reaction while passing through the vent hole 6 of the catalyst 7. The blown air is warmed by the combustion means 2 to become warm air and is discharged from the discharge nozzle 29. Immediately after turning on the contact on the motor 18 side, the temperature in the vicinity of the thermistor 31 is still about room temperature, so the resistance value of the thermistor 31 is maintained high (about 10 to 15 Ω) as shown in FIG. The input voltage to the motor 18 becomes low, and the rotation speed of the motor 18 can be kept low.
Therefore, the amount of blown air is reduced, the gas concentration in the mixing chamber 8 is maintained high, and the spread of combustion is accelerated. Combustion means 2
When the combustion in (1) further progresses, the air sent by the blower means 1 is warmed by the combustion means 2 and its temperature rises a little. Then, the temperature in the vicinity of the thermistor 31 also rises, so that the resistance value of the thermistor 31 falls a little, the input voltage to the motor 18 rises a little, and the rotation speed of the motor 18 rises. Then, as the combustion in the combustion means 2 progresses, the number of rotations of the motor 18 increases and the amount of air blown by the motor 18 also increases. The temperature of the air hitting the thermistor 31 is 110-130 ℃
Then, the thermistor 31 takes the minimum resistance value and the motor
The rotation speed of 18 is the maximum. Then, the amount of air blown by the motor 18 becomes a predetermined amount during steady operation, and the steady state is reached.
In this way, if the air volume is gradually increased after ignition (at the start of combustion), the effect of cooling the combustion means 2 and the like due to the air blow is small, and the amount of air mixed with gas is initially small. Since the gas concentration is small and the gas concentration is high, the combustion rise time after ignition is short, the temperature of warm air rises quickly, and the temperature reaches the practical range quickly. Further, since the fuel is gas and the catalytic combustion type combustion means is provided, it can be made compact and portable, and it can generate a large amount of heat energy, which may hinder combustion by wind. Low, less toxic exhaust gas is generated, and temperature control is relatively easy. When combustion is stable, gas is mixed with blast air at an appropriate concentration (about 1%),
It is good to decide the size of the inlet 27.

FIG. 4 shows another embodiment of the portable warm air heater according to the present invention.

In this portable hot air blower, a temperature sensing element made of bimetal is used as the air volume control means, and the electric circuit is as shown in FIGS. 5 (a) and 5 (b). That is, the motor 18 uses the temperature sensing element (temperature sensitive contact) 32 and the contact plate 34, and the temperature sensing element 32, the contact plate 33, and the ignition means 3 through the + electrode (+ terminal 22) of the battery 4.
In addition to being electrically connected to the negative pole of the battery 4, the negative pole (negative terminal 23) of the battery 4 is electrically connected via the switch 14 (switch contact 15). As shown in FIGS. 6 (a) and 6 (b), the temperature sensing element 32 has contacts 32a, 32b provided on both sides of its tip,
It is arranged in the vicinity of the ceramic catalyst 7 inside the discharge port lattice 30 of the discharge nozzle 29 so as to be sandwiched between the contacts 33a, 34a provided at the tips of the contact plates 33, 34. Then, the temperature change of the combustion means 2 can be directly captured. The switch 14 is configured to either close the gas on-off valve 16 and turn off the switch contact 15, or open the gas on-off valve 16 and turn on the switch contact 15. The other structure of this portable air heater is the same as that of the above-mentioned embodiment, and the common numbers indicate the same things.

This portable air heater operates as follows. switch
When 14 is turned off, the circuit state is as shown in FIG. 5 (a), and as shown in FIG. 6 (a), the temperature sensing element 32 is the contact. Touching plate 33.
The gas on-off valve 16 is closed. switch
When 14 is slid in the direction of the arrow (see FIG. 4), the gas on-off valve 16 opens and the switch 14 (switch contact 15) is in the ON state as shown in FIG. 5 (b). become. Then, power is supplied from the battery 4 to both the motor 18 and the ignition means 3 at the same time. Therefore, the ignition means 3 starts to glow red. On the other hand, since the motor 18 has a voltage drop due to the ignition means 3, it starts to rotate slowly. Therefore, the amount of air blown is reduced, and the gas concentration in the mixing chamber 8 is maintained high,
The spread of combustion becomes faster. When combustion is started in the combustion means 2 and the air temperature starts to rise, the temperature sensing element is shown by a broken line in FIG. 5 (b) and also shown in FIG. 6 (b). Directly, the + pole of the battery 4 (+
Contact the terminal plate 34 connected to the terminal 22). Then, the number of rotations of the motor 18 increases and reaches a predetermined number of rotations during steady operation, and the steady operation state is entered. In this way, if the air flow rate is adjusted in two steps such that the rotation speed of the motor is reduced immediately after the start of combustion and then the rotation speed is increased, the influence of cooling of the combustion means 2 and the like due to the blown air will be affected. In addition, since the amount of air mixed with gas is small and the gas concentration is high at the beginning, the combustion rise time after ignition is shortened, the temperature of warm air rises quickly, and the temperature reaches the practical range. Is fast.

In each of the above-mentioned embodiments, the catalyst of the combustion means is supported on the ceramic having a large number of vent holes, but it is not always necessary to do so.

〔The invention's effect〕

A portable warmer according to the present invention comprises a blower means, a catalytic combustion type combustion means for heating the air sent by the blower means, an ignition means for igniting the combustion means, the blower means and an ignition. A portable hot air blower comprising a power source for supplying power to the means and a fuel gas tank for supplying fuel gas to the combustion means, wherein the blowing means initially reduces the air flow rate at the start of use, and thereafter, Since the air volume control means for increasing the predetermined air volume during steady operation is connected to, it is possible to generate a large amount of heat energy, the combustion is less disturbed by the wind, and the generation of toxic exhaust gas is less. The temperature control is relatively easy, and the combustion rise time after ignition is short.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of one embodiment of a portable air heater according to the present invention, FIG. 2 is an electric circuit diagram of the same embodiment, and FIG. 3 is a graph showing a relation between resistance and temperature of a thermistor, FIG. 4 is a vertical cross-sectional view of another embodiment of a portable air heater, FIG. 5 (a).
And (b) is an electric circuit diagram of the embodiment, (a) of FIG.
And (b) are operation explanatory views of the temperature sensing element of the same embodiment,
FIG. 7 is a vertical sectional view of a conventional portable dryer. 1 ... Blower means, 2 ... combustion means, 3 ... ignition means, 4
…… Batteries, 5 …… Fuel gas tanks, 7 ceramic catalysts,
31 …… Load thermistor, 32 …… Temperature sensing element

Claims (3)

[Claims] 1. A blower means, a catalytic combustion type combustion means for heating air sent by the blower means, an ignition means for igniting the combustion means, and a power supply for supplying power to the blower means and the ignition means. A portable hot air blower provided with a fuel gas tank for supplying fuel gas to the combustion means, wherein the blower means reduces a blown air amount at the beginning of use and then a predetermined value for steady operation. A portable warm air blower, which is connected to an air flow rate control means for increasing the air flow rate of the portable hot air blower. 2. The portable air heater according to claim 1, wherein the air volume control means is composed of a negative characteristic thermistor, is connected in series to the motor of the air blowing means, and is arranged at the air outlet of the air blower. . 3. A portable air heater according to claim 1, wherein the air volume control means is composed of a temperature sensing element and is arranged in the vicinity of the combustion means.