JPH09243176A - Electrical hot-air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical hot-air heater having a superior instant heating characteristic and an instant cooling characteristic by a method wherein there are provided a container having air suction port and an air blowing port for air fed from a blower, an infrared-ray bulb for heating air in the container and a screen arranged at the air blowing port for restricting a light beam of the infrared-ray bulb from being leaked out to a surrounding area. SOLUTION: Air blown from a blower 1 into a container 2 is heated by a surface heating section of an infrared-ray bulb 4 and concurrently it is directly contacted with a heated inner wall 6 of the container and heated. In addition, radiated heat beam of the infrared ray bulb 4 is absorbed into air and the heated hot air is discharged out of the blowing port 1 of the container 2. In order to improve a heat exchanging performance and prevent overheating of the inner wall 6 of the container 2, a heat absorption reflecting part 8 is arranged within the container 2. In addition, in order to control a hot air blowing direction at the air blowing port 7, make a complete shut-off of a light beam generated from the infrared-ray bulb 4 and leaked out of it to the surrounding area or adjust an amount of light, there is provided a screen 9. In order to cause a part of the light beam from the infrared ray bulb 4 to be leaked to the surrounding area, a part of the screen 9 may be provided with a window 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hot air blower which is excellent in immediate heating and cooling properties and which can discriminate a heating output state without a special display device.

[0002]

2. Description of the Related Art In a conventional electric hot air blower, a heating wire or a PTC heater 14 as shown in FIG. 3 is used as a heating body, but the heating wire has a coil shape to increase an effective contact area with air. Improve heat exchange performance, and also PTC
The heater 14 has a honeycomb-shaped heat exchanger and is sandwiched to enhance heat exchange performance.

However, even with such an electric hot air blower devised in this way, its immediate heat resistance is insufficient, and it takes some time for the temperature of the hot air to rise after the switch is turned on, and it is heated immediately. However, there is a problem in that it does not work sufficiently when required. This is a heating wire or PTC
This is because the heating element of the heater 14 takes time to rise its temperature and, in addition, it takes time to transfer heat to the heat exchanger. This means that the heating wire and the heating element of the PTC heater 14 take time. This is because heat is generated by resistance heating and it takes time until the temperature of the heating element rises sufficiently.

On the other hand, when the heating is stopped, it takes time to cool the heating element and the heat exchanger, so that it takes time to lower the temperature. Further, when the conventional electric hot air blower falls, even if the overturn sensor operates and the power source of the heating heater is turned off, if a combustible material comes into contact with the heating portion for some reason, there is a risk of fire. Therefore, in order to prevent the risk of fire due to the residual heat of the heating unit, it is also possible to turn on the power of the blower for a certain period of time or more in order to cool the heating unit even after the heating is stopped.
To enable this, the electrical circuit becomes a complex circuit with a timer.

In addition, the conventional electric hot air blower cannot directly see the heating element from the outside, and in order to determine whether the heating element is energized or whether the output thereof is large or small, a heating state determining device is separately provided. Need to be attached. That is, it is necessary to provide a display device such as an LED, and in order to execute this, the electric control circuit becomes more complicated. Even if the light emission of the heating element could be seen directly, the change in brightness due to the magnitude of the output was not so large, and it was difficult to distinguish it.

[0006]

DISCLOSURE OF THE INVENTION The present invention is excellent in instant heating and instant cooling, and the state of the heating output can be discriminated without providing a special display device, and further, the timer for the fan is not required, and The problem to be solved is to provide an electric warmer that can prevent forgetting to turn off the switch.

[0007]

DISCLOSURE OF THE INVENTION The present invention is directed to a blower, a container having an air inlet and a blower for air from the blower, and at least a heating portion thereof housed in the container to heat the air in the container. The electric warmer includes an infrared light bulb and a screen that is provided at the blower opening and that restricts the light rays from the infrared light bulb from leaking to the outside.

Further, the container comprises an electric warmer provided with a device for reflecting light rays and heat rays and / or a device for absorbing heat rays from the infrared light bulb inside the container, and further the infrared light bulb in the container and / or the screen. It consists of an electric warmer equipped with a window through which the rays of light can leak.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side sectional view for explaining an electric warmer in one embodiment thereof. First, FIG.
In FIG. 1, reference numeral 1 denotes a blower, which communicates with an intake port 3 of a container 2, and an intake port 3 and a blower port 7 for air from the blower 1 are provided in the container 2, but inside the container 2. Accommodates the infrared light bulb 4 (at least its heating part), and the heating part of the infrared light bulb 4 heats the air in the container 2.

The air sent from the blower 1 into the container 2 is heated by the heating portion of the surface portion of the infrared light bulb 4, and at the same time, comes into contact with the heated inner wall 6 of the container 2 and is further heated. Further, this air absorbs heat rays directly radiated from the infrared light bulb 4 and is heated, and the heated warm air is discharged to the outside from the air outlet 7 of the container 2. A heat absorbing / reflecting portion 8 is provided in the container 2 so as to improve the heat exchange property and prevent the inner wall 6 of the container 2 from being excessively heated. And / or an absorber may be provided.

Next, 9 in FIG. 1 is a screen provided on the outlet side of the blower port 7 for controlling the blowing direction of warm air from the blower port 7 and emitted from the infrared light bulb 4 to the outside. It is provided to completely block the leaking light beam or to adjust the amount of light. In order to partially leak the light from the infrared light bulb 4 to the outside, a window 12 is provided in a part of the screen 9 as described above, and / or a window (not shown) is provided at an arbitrary position of the container 2. May be.

The blower 1 may be a cross flow fan, a sirocco fan, a turbo fan or the like which is normally used, and is not particularly limited to this embodiment. The shape of the container 2 is not particularly limited and may be square or circular.
The shapes and installation positions of the intake port 3 and the blower port 7 are also not particularly limited.

Further, the material of the container 2 is not particularly limited, but ordinary metal materials such as steel materials and aluminum alloys have excellent heat exchange characteristics or thermal conductivity, and further have excellent heat resistance. Therefore, it is preferable. On the other hand, the infrared light bulb 4 used in the present invention is not particularly limited as long as it emits heat rays, and a halogen lamp or a general infrared light bulb can be used,
In particular, since the halogen lamp emits a strong light ray in addition to the heat ray, it is suitable for grasping the energization state from the outside by the strength of the light ray, and the state of the heating output can be determined by this.

Since the infrared bulb 4 is composed of an electrode part and a heating part sandwiched by the electrode part, if at least the heating part is housed in the container 2, the purpose of heating the air is to be improved. Since it can be achieved, it is not always necessary to store the entire infrared bulb 4 in the container 2. Next, since the heat ray absorbing capacity of air is low, heat exchange is mainly performed in the heating part of the infrared light bulb 4 and the inner wall 6 portion of the container 2, but when the inner wall 6 portion of the container 2 is excessively heated, When the heat dissipation efficiency from the outer wall surface 10 of the container 2 is large and the heat exchange efficiency is poor, a reflection device for the light rays and heat rays from the infrared light bulb 4 is provided between the container 2 and the infrared light bulb 4. The heat absorbing / reflecting portion 8 may be provided by a heat absorbing device.

That is, the heat absorbing / reflecting portion 8 is provided between the infrared light bulb 4 and the inner wall 6, between the infrared light bulb 4 and the blower 1, or between the infrared light bulb 4 and the screen 9. For the heat absorbing / reflecting portion 8, a metal plate coated with black paint, a honeycomb made of metal, or the like can be used as an absorbing device, and a metal plate such as mirror-finished aluminum can be used as a reflecting device.

Next, FIG. 2 shows an example of heating / cooling curves of the temperature of the heat absorbing / reflecting portion 8 when the infrared light bulb 4 is used as the heating body and when the coiled nichrome heating wire is used. In this, for example, the infrared bulb 4 of the halogen lamp of the same output of 650 W or the coiled nichrome heating wire is arranged in the electric warmer as shown in FIG. 1, respectively, and the same heating power is applied to the heat absorbing and reflecting section. 8 is the measured temperature change.

In the above measurement, the heat absorbing / reflecting portion 8 is made of, for example, a high-efficiency radiation paint B-60 manufactured by Okitsumo Co., Ltd.
A black coated stainless steel plate containing 0 was used, and the distance between the heating element and the heat absorbing / reflecting portion 8 was 2 cm.
Also by this measurement, the infrared light bulb 4 has the heat absorption and reflection part 8
The heating rate and the cooling rate are high, and the infrared light bulb 4 is excellent in the temperature rising rate and the cooling rate.

[0018]

According to the electric hot air blower of the present invention described above, the temperature rise of the heating element does not take a long time and is excellent in the immediate heating property, and the time required for lowering the temperature is reduced, and the immediate cooling property is improved. Is also excellent. Further, according to the present invention, it is possible to provide an electric warmer that does not require a timer for a blower, and the state of the heating output can be determined without a special display device, that is, simply by providing a window, and further direct light rays can be directly emitted. By looking at it, you can prevent forgetting to turn off the switch, and you can provide a safe and economical electric air blower.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view illustrating an electric warmer according to an embodiment of the present invention.

FIG. 2 is a heating / cooling characteristic diagram of the temperature of a heat absorbing / reflecting portion when an infrared light bulb heater is used as a heating body of the electric air blower of FIG. 1 and when a nichrome heating wire is used.

FIG. 3 is a schematic perspective view for explaining a conventional PTC heater.

[Explanation of symbols]

 1 Blower 2 Container 3 Air inlet 4 Infrared light bulb 5 Heating part 7 Air blower 9 Screen 12 Window

Claims (3)

[Claims] 1. A blower, a container having a suction port and a blower port for air from the blower, an infrared light bulb having at least a heating unit housed in the container to heat the air in the container, and the blower. An electric hot air blower equipped with a screen provided at the mouth part to limit the leakage of light rays from an infrared light bulb to the outside. 2. The electric warmer according to claim 1, wherein a reflection device for heat rays and heat rays from an infrared light bulb and / or a heat ray absorption device is provided inside the container. 3. The electric warmer according to claim 1, wherein the container and / or the screen is provided with a window through which light rays from an infrared light bulb can leak.