JPS61260577A - Infrared irradiator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an infrared irradiator, for example, an infrared irradiator that remotely irradiates and heats a flat object to be heated.

[Conventional technology]

Figure 3 is a cross-sectional view of a conventional infrared irradiator. In the figure, (1) is a cylindrical reflective housing with a slit-like opening (2) in the front, and has a circular cross section, and (3) is a reflective housing. The heat source is a rod-shaped sheathed heater or the like arranged inside the housing (1). The center (3a) of this heat source (3) is located a predetermined distance behind the center (la) K of the reflective housing (1). (4) is a heat insulating member such as glass wool that covers the outside of the reflective housing (1).

In the infrared irradiator with the above configuration, the heat source (3
) The infrared rays used directly from the heat source (3) in the area between the arrows (A) and (B) connecting the center (3a) of Settings can be controlled depending on the position of the heat source (3) and the width of the slit-shaped opening (2).

On the other hand, the infrared rays that exit the heat source (3) and are once reflected by the reflective housing (1), for example, the infrared rays that are reflected in the direction of arrow (C), pass through the slit-shaped opening (2) and (θ)
radiates outward from the area. Further, the infrared rays in the direction of arrow (D) are reflected within the reflection casing (1) and have no fixed direction. Therefore, the irradiation target surface (K) in this case is set to a manageable dimension between arrows (A) and (B).

In addition, this type of infrared irradiator generally has a reflective housing with a parabolic cross-sectional shape, but in this case, the front opening becomes wider and the temperature of the heat source (3) decreases due to convection. do. Furthermore, if the infrared irradiator is installed outdoors, for example for melting snow on railway track surfaces, and is exposed to wind, the above-mentioned tendency for the heat source temperature to decrease will become even stronger, and the overall efficiency will deteriorate. . Furthermore, it is not suitable when one irradiation target surface is narrow. Therefore, a reflective housing (1) with a smaller front opening size is employed.

[Problem that the invention seeks to solve]

Conventional infrared irradiators are configured as described above, so: (1) Some infrared rays deviate from the dimensions of the irradiation target, resulting in a lot of loss.

■Reflection There are many infrared rays that are reflected within the housing and scattered non-directionally. Although some of this scattered infrared rays is effective,
Most of the loss is absorbed by the reflective casing and passes through the heat insulating member, or the loss is dissipated to areas other than the irradiation target.

There were problems such as.

This invention was made to solve the above-mentioned problems, and its purpose is to obtain an efficient infrared irradiator.

[Means for solving problems]

The infrared irradiator according to the present invention includes a reflective housing K having a slit-shaped front opening and a heat source disposed at the center of a circular cross section;
A reflector with a predetermined curvature is held at the rear of the heat source, separated from the reflector housing. [Function] The infrared rays that hit the reflector in this invention are located on the slit side of the reflector housing. The light is reflected by being condensed at the focal point of the reflector plate, and the light is reflected by the reflection housing having a circular cross section and is fed back to the heat source.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1, which has the same reference numerals as those in FIG. 3. In Figure 1, (5)
shows a cylindrical reflective housing with a circular cross section with the center (5a), and this reflective housing (5) has a slit-shaped opening (6) of a predetermined width formed in its front surface. (7) focuses on (5a
) and (7a).
), the reflective housing (5) and the heat source (3) are arranged at a distance from each other. (8) is a heat insulating member (
This is a case that covers the outer periphery of 4).

Arrows (M) and (E) indicate infrared radiation from the heat source (3), arrows (I') and (G) indicate radiation from the heat source (3),
The figure shows the reflected infrared rays reflected by the elliptical reflector (7) K. (E) shows the irradiation target part of this irradiator.

In the infrared irradiator having the above configuration, the heat source (3)
The infrared rays emitted from the slit-shaped opening (6)
The light within the range of the angle (θI) between arrows (A) and (B) that reaches the irradiation target area (E), and the light that is reflected by the elliptical reflector (7) and focused on the focal point (7a). , irradiation target area (K)
One is within the range of angle (θ2) between the arrows (F) and (G) pointing toward the other, and the other is reflected by the reflective casing (5) with a circular cross section and fed back to the heat source (3).

Here, the fed-back infrared energy returns to the heat source (3) except for heat loss on the reflective housing (5) side, heats the heat source, and finally becomes infrared energy directed toward the irradiation target part (K). converted. Therefore, in order to increase the irradiation efficiency, the reflective housing (5) must have excellent infrared reflectance, and the outside of the reflective housing (5) must be covered with a heat insulating material (4) to reduce heat loss to the outside. It is said that

FIG. 2 shows a cross-sectional view of an infrared irradiator according to a second embodiment of the present invention, in which the same parts as in FIG. 1 are given the same reference numerals. In FIG. (r) is a reflective housing with a circular cross section, and has a slit-shaped opening (6) of a predetermined width on the front surface, and a heat source (3) is arranged at the center (5a). . (9) is the radius (R) with the center at (9a)
This arc-shaped reflector (9
), the heat source (3) and the reflective housing (5) are kept separate from each other.

The radius (R) is set to twice the distance between the center (5a) where the heat source (3) is placed and the reflector (9).

In this embodiment with the above configuration, infrared rays (for example, arrows (H
)) is parallel to the axis (J) connecting the centers (9a) and (5a), and reaches the irradiation target part (K) through the slit-shaped opening (6). Therefore, the infrared irradiation density at the irradiation target part (PC) is different from that in the embodiment shown in FIG. 1, but it is sufficient to select an appropriate one depending on the irradiation target. In other words, the curvature of the reflector may be set so that an appropriate infrared irradiation density can be obtained depending on the object to be irradiated.

〔Effect of the invention〕

As described above, according to the present invention, the reflective housing has a slit-shaped front opening and a heat source located at the center of the circular cross section.
Since a reflector plate having a predetermined curvature is held at the rear of the heat source and separated from the reflection casing, (1) the infrared rays reflected from the reflector plate reach the irradiation target area without loss;

■The infrared rays reflected by the reflective housing are directly fed back to the heat source, so by increasing the reflectance of the reflective housing and increasing the insulation effect of the heat insulating material, this is converted into effective infrared irradiation energy. becomes possible.

With these effects, an infrared irradiator with high infrared irradiation efficiency can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an infrared irradiator according to a first embodiment of the invention, FIG. 2 is a cross-sectional view showing an infrared irradiator according to a second embodiment of the invention, and FIG. 3 is a cross-sectional view showing an infrared irradiator according to a second embodiment of the invention. FIG. 3 is a cross-sectional view showing the irradiator. In the figure, (3) is a heat source, (4) is a heat insulating member, (5) is a reflective housing, (6) is a slit-shaped opening, (7) is an elliptical reflector, and (9) is an arcuate reflector. It is. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Patent attorney Masuo Oiwa (and 2 others) Figure 1 3: Scroll 4: Tate f! S dead material 5: Reverse body 1i44- 6: Sekiguchi A: Rokugan IL Sui 1i

Claims (3)

[Claims] (1) A reflective housing with a slit-shaped front opening and a circular cross section, a heat source located at the center of the circular shape of the reflective housing, and a reflective housing located at the rear of the heat source that emits reflected light from the heat source. An infrared ray irradiator comprising: a reflecting plate having a predetermined curvature for reflecting light from the slit-shaped opening in a direction to an irradiation target, and held within the reflecting housing at a distance from the reflecting housing. (2) The infrared irradiator according to claim (1), wherein the reflector has an elliptical curvature and a heat source is disposed at one focal point of the ellipse. (3) The curvature of the reflector is configured in a semicircular shape, and 1/ of this radius
The infrared irradiator according to claim (1), wherein the heat source is arranged at a distance of 2.