JPH0518870Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a heater that can increase the rate of temperature rise of a heated object during startup by enabling switching between far infrared rays and near infrared rays. .

[Prior art and its problems] Conventional far-infrared heaters use far-infrared emitting materials such as ceramics, which have a large heat capacity and a small heat transfer coefficient, so the temperature rise rate at the time of lighting is slow. There was a problem that it was slow and required a considerable amount of time to reach a predetermined temperature.

[Purpose of invention]

The present invention was made in view of the problems of the conventional method, and its purpose is to use infrared heating at the initial stage of lighting, and when the temperature rises to a certain extent, far infrared rays are emitted from the far infrared emitting material film. To provide a novel heater which switches the radiation surface when the temperature reaches the temperature and thereafter emits far infrared rays with excellent heat absorption properties.

[Means for Solving the Problems] The present invention solves the above problems by: <1> An infrared heater 3 having a filament 2 installed in a glass tube 1 is rotatably arranged in front of a reflecting mirror 4. .

<2> A far-infrared emitting material film 5 is formed on one half of the infrared heater 3, and this half is used as a far-infrared emitting surface 5.
Let it be a.

<3> The remaining half surface is used as the transparent surface 6 and the near-infrared radiation surface 6a.

; adopts technical means.

[Function] <1> First, when the heater 3 is turned on, the internal filament 2 becomes red hot and emits infrared rays.

<2> At this time, infrared rays are emitted forward from the transparent glass surface 6 to raise the temperature of the object to be heated.

<3> At the same time, the infrared rays directed toward the back heat the far-infrared emitting material film 5 formed on one half of the glass tube 1.

<4> As a result, the temperature of the far-infrared emitting material film 5 gradually rises, and finally reaches a temperature at which it can emit far-infrared rays.

<5> After that, the heater 3 is rotated 180 degrees so that the far-infrared emitting material film 5 side is the front side.

<6> As a result, far infrared rays will be emitted from now on.

<Examples> The present invention will be described in detail below with reference to illustrated examples.
The heater 3 uses, for example, a straight tube type halogen light bulb. A straight tube type halogen light bulb has a coiled filament 2 installed inside a glass tube 1, and both ends of the filament 2 are welded to molybdenum metal foil 8 in pinch seals 7 formed at both ends. It is arranged in the center of the glass tube 1 by means of a support 9 attached thereto. A coating 5 of a far-infrared emitting material such as a ceramic coating that emits far-infrared rays is formed on one half of the glass tube 1 over the entire length in the longitudinal direction, and the other half is a transparent surface 6. The heater 3 formed in this way has a reflecting mirror 4 such as a concave reflecting mirror, for example.
It is rotatably placed in front of the.

Thus, the heater 3 is turned on to heat the object to be heated. Initially, the heater 3 is turned on with the transparent surface 6 placed in front. Then, near-infrared rays are radiated forward from the transparent surface 6 to start heating the object to be heated. At this point, the far-infrared ray emitting material film 5 of the heater 3 has not reached a predetermined temperature and no far-infrared rays are emitted. However, the near-infrared rays directed backward from the filament 2 gradually raise the temperature of the far-infrared emitting material film 5, and after a certain period of time, it begins to emit far-infrared rays. At this time, the heater 3 is turned over so that the surface on which the far-infrared emitting material film 5 is formed is positioned forward. As a result, far infrared rays are radiated forward and heat the object to be heated. The near-infrared rays emitted to the back of the heater 3 are reflected by the concave reflector 4 on the back through the transparent surface 6, and a part of the near-infrared rays is irradiated forward, contributing to the heating of the object to be heated. Further, the rest of the reflected near-infrared rays is reflected back to the heater 3 and contributes to heating the far-infrared emitting material film 5.

[Effects] As described above, in the present invention, an infrared heater with a filament installed in a glass tube is rotatably arranged in front of a reflecting mirror, and a far-infrared emitting material film is formed on one half of the infrared heater to make this half far away. The infrared radiation surface is an infrared ray emitting surface, and the other half is a transparent surface and a near infrared radiation surface, so while the far infrared ray emitting film is too low to emit far infrared rays at the time of heating, the transparent surface is placed in front and the near infrared rays emitted from the heater are used. The object to be heated is heated, and the near-infrared rays emitted from the back of the heater heat the far-infrared radiation film on the back. Therefore, it becomes possible to heat the object to be heated from the initial stage of lighting. Subsequently, when the far-infrared rays emitting film is sufficiently heated and far-infrared rays are emitted, the heater is reversed to position the far-infrared rays emitting film side forward, and heating is continued.
This makes it possible to heat the object to be heated extremely quickly. Furthermore, since a concave reflector is disposed at the back, a portion of the near infrared rays from the transparent surface that have been directed to the back are reflected by the concave reflector and further promote heating in cooperation with the far infrared rays. Moreover, the remainder of the near-infrared rays reflected by the concave reflector returns to the heater side and further heats the far-infrared rays emitting film.
This will contribute to far-infrared radiation.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a cross-sectional view of the present invention with its transparent surface facing forward;
Fig. 3 is a cross-sectional view of the present invention with the far-infrared ray emitting surface facing forward, 1 is a glass tube, 2 is a filament, 3 is an infrared heater, 4 is a reflector, 5 is a far-infrared emitting material film, 5a is a A far infrared ray emitting surface, 6 a transparent surface, 6a a near infrared ray emitting surface, 7 a pinch seal portion, 8 a molybdenum metal foil, and 9 a support.

Claims (1)

[Scope of utility model registration request] An infrared heater with a filament installed in a glass tube is rotatably placed in front of a reflecting mirror, and a far-infrared emitting material film is formed on one half of the infrared heater to make this half an infrared radiation surface, and the other half is a transparent surface. A heater capable of switching between far-infrared rays and near-infrared rays, characterized by a near-infrared radiation surface.