JPH03160221A - Radiation type electric heater - Google Patents

Abstract

PURPOSE:To enable provision of a radiation area wider than the area of a panelform heater by a method wherein a panelform heater is provided with an approximately parabolic reflection plate in a shape in cross section protruding toward the panelform heater side. CONSTITUTION:A nichrome wire is caused to generate heat through energization to heat a heater unit 4. Heat is transmitted to a radiant plate 3, and radiation is effected from the surface of the radiant plate 3. Meanwhile, heat transmitted from the heater unit 4 to a heater press metal 5 is radiated from the surface of the heater press metal 5. After the heat is reflected by the approximately parabolic part, in a shape in cross section protruding to the heater side, of a reflecting plate 2, the heat is reflected again by an approximately parabolic part, in a shape in cross section recessed toward to the heater side, to radiant the heat to the front of a device. Air heated by the rear of a panelform heater 1 creates natural convection, air is sucked from the lower part of the panelform heater 1 and passes the rear of the panelform heater 1, and is discharged from the upper part of the panelform heater 1. Thus, by reflecting radiation from the rear of the panelform heater 1 by the reflecting plate 2, an area of radiation to a front can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a radiant electric heater for local heating purposes.

2. Description of the Related Art Conventional electric heaters using a panel-shaped heater as a heating element generally heat an object by radiation from the surface of the panel-shaped heater 1, as shown in FIG. In addition, the flat reflector 2 on the back of the panel heater blocks the heat radiated to the back of the heater, and the heat on the back of the heater is dissipated by the natural flow generated by the heat (for example, 59-96505
issue).

Problems that the invention aims to solve In this conventional structure, the radiant heating effect is centered on a limited area in front of the panel surface, and in order to heat a wide area, a wider area of the panel surface is required. Ta.

The present invention solves the above problems and reduces the area of the panel heater.
The present invention provides a radiant electric heater that provides a wider heating area.

Means for Solving the Problems In order to solve the above problems, the radiant electric heater of the present invention is provided with a substantially parabolic reflecting plate having a convex cross section on the heater side on the back surface of the panel heater.

Effect With the above configuration, the radiant heat from the back of the panel heater is
The radiation area is expanded by increasing the probability that the radiation will be reflected outside the range of the panel-shaped heater at the angle formed by the reflecting plate, which is a substantially parabolic shape convex toward the heater.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

The structure of the radiant double air heater of this embodiment is as shown in Figure 1.
3 is a bulb-shaped heater, in which a heater unit 4 made of a nichrome wire insulated with an electrical insulator is placed in close contact with the back of the heat sink 3 coated with far-infrared paint and the heat sink 3. Further, on the back side of the heat unit 4, there is a heater holding fitting 5, which brings the heat sink 3 and the heater unit 1-4 into close contact. A reflecting plate 2 is provided on the back side of this panel-shaped heater 1. The reflector plate 2 has a vertical cross section with a substantially parabolic groove with a convex shape on the heater side in the range where the panel-shaped heater 1 is projected, and the reflector plate outside the range where the panel-shaped heat recorder 1 is projected. The vertical section has a concave, substantially parabolic groove on the heater side. Further, the central axis of the bulb-shaped heater 1 and the focal axes of the two types of parabolas of the reflecting plate 2 coincide.

The panel-shaped heater 1 and the reflector plate 2 are supported by a body 6, and the body angle can be changed by fitting the podium 6 into the legs 7 and sliding them.

Next, the operation of the configuration of this embodiment will be explained.

First, when electricity is turned on, the nichrome wire generates heat and the heater unit
- 4 is heated. Furthermore, heat is transferred to the heat sink 3 and radiated from the surface of the heat sink 3.

On the other hand, the heat transmitted from the heater unit 4 to the heat holding fitting 5 is radiated from the surface of the heater holding fitting 5, and is reflected by the substantially parabolic portion of the reflector plate 2 whose cross section is convex on the heat side. After that, the light is reflected again by a substantially parabolic section whose cross section is concave toward the heater and radiates toward the front of the vessel. Also, the air heated on the back surface of the panel heater 1 causes natural convection, is taken in from the bottom of the panel heater 1, passes through the back surface of the panel heater 1, and is exhausted from the top of the panel heater 1.

In this way, in this embodiment, the radiation area toward the front can be expanded by reflecting the radiation from the back surface of the panel heater 1 on the reflection plate 2. Against again! l] to more effectively dissipate the radiant heat from the back of the panel-shaped heater 1, and the reflector effectively promotes the natural flow of air on the back of the panel-shaped heater, suppressing the temperature rise of the body and directing it to the heating target. In addition to increasing the heating effect of the panel-shaped heater, there is no need for a heat insulating material on the back surface of the panel-shaped heater, and the arrangement of the panel-shaped heater can be simplified.

Effects of the Invention As is clear from the above description of the embodiments, the radiant electric heater of the present invention has a panel-shaped heater provided with a substantially parabolic reflecting plate having a convex cross section on the panel-shaped heater side. Therefore, the radiation on the back side of the panel-shaped heater can be reflected to the front side, and a radiation area larger than the area of the bulb-shaped heater can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a radiant electric heater according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part of the heater, and FIG.
The figure is a longitudinal cross-sectional view of a conventional panel-shaped heater reflector. 1...Panel-shaped mirror, 2...Reflector.

Claims (1)

[Claims] A radiant electric heater comprising a panel-shaped heater and a reflecting plate on the back side of the panel-shaped heater, the reflecting plate having a substantially parabolic cross section convex toward the heater side.