JPS61138484A - Infrared rays 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 used, for example, in a snow melting device for a railway track surface.

[Conventional technology]

Figure 10 shows a cross-sectional view of a conventional infrared irradiator.
Reference numeral 1 denotes a reflector made of an aluminum plate having an elliptical locus cross section with focal points in and lb on the inside and outside, and a rod-shaped heating element 2 such as a sheathed heater is arranged at the focal point 1a located inside.

3 is a case that covers the reflector 1. Note that F is the focal point 1a
This is the axis line connecting the focal point 1b and the focal point 1b.

In the infrared irradiator constructed as above, when the heating element 2 is energized, the infrared rays to be used directly are emitted from the heating element 2 at the angle 01 between the arrows A and 8, while the infrared rays that hit the reflector 1 and are reflected ( For example, according to arrow C, the range of reflected infrared rays is the angle θl between arrows D and E.

This infrared irradiator is used, for example, as shown in FIG. 11, for melting snow on railway track surfaces. In FIG. 11, 5 is a track surface, 6 is a rail, and in this case, the part to be snow melted is a convex part of the road surface 5.

Here, the infrared irradiator is installed on the track surface 5 which does not interfere with train running.
It is arranged at a predetermined height on the side part of the track surface 5 so as to be inclined downward with respect to the track surface 5.

Therefore, if we assume that the total infrared energy emitted from the heating element 2 has a reflectance of 100% on the reflector 1, then the arrow A
Infrared energy of θ, 7360% is emitted between -B, and further (360-θ, 7360%) is emitted between D-F and F-8.
) / 360X 2% infrared energy is added.

In addition, there is absorption of air, etc. depending on the distance from the heating element 2 to the road surface 5, and the density of infrared rays reaching the road surface 5 is 12th.
As shown in the figure, it is extremely unbalanced with respect to the road surface 5. In particular, the area between F and 8 is extremely high compared to other areas.

[Problem that the invention aims to solve]

In addition to snow melting applications, there are also many applications where more uniform heating is required when infrared rays are irradiated at an angle to a plane to be irradiated, but the conventional infrared irradiation 1 cannot satisfy these requirements. In the case of snow melting applications such as the one mentioned above, there were problems in that it was difficult or took a long time to completely melt the snow on the surface to be irradiated, and there was also a large loss of electrical energy.

The invention of B was made in order to solve the above-mentioned problems, and its purpose is to obtain an infrared irradiator that can heat more uniformly.

[Means for solving problems]

The infrared irradiator according to the invention of Party B is equipped with an upper reflector and a lower reflector, each having a different focal point and cut in an elliptical locus, and the two are arranged so that the focal points located within the reflectors coincide or are at approximately the same position. A heating element is placed at the focal point or a position close to the focal point.

[Effect]

In the infrared irradiator according to the present invention, by making the focal lengths of the upper and lower reflectors different, the infrared rays radiated from the heating element are reflected by the reflectors and then irradiated onto the irradiation target surface through two different focal points, Infrared energy is more evenly distributed.

〔Example〕

FIG. 1 shows a cross-sectional view of an infrared irradiator showing an embodiment of the present invention. In FIG. 1, 7 is an upper reflector;
It has an elliptical locus cross section with focal points 7n and 7b. 8 is a lower reflector, which has a focal point 8a.

It has an elliptical locus cross section with 8b. Further, the focal length of the upper reflecting plate 7 is set shorter than that of the lower reflecting plate 8 to a predetermined value. A focal point 7n located within each reflecting plate
, 8a are aligned or nearly aligned, and the focal points 7b and 8b located outside the reflector are placed on the same axis and connected integrally.

2 is a rod-shaped heating element placed very close to the focal points 7a and 8a, and 3 is a case that covers the back surfaces of the re-reflection plates 7 and 8.

In the infrared rays emitted from the heating element 2 having the above configuration, the heating element 2 is located between the arrows GH and 6.
In addition, the infrared rays reflected by the lower reflector 8 are emitted directly between J-X, that is, at the angle 65, and the infrared rays reflected from the upper reflector 7 are located between X-, that is, at the angle 66, respectively, at the focal point 8b. ,? After concentrating on 'b, it disperses.

FIG. 2 shows an example in which the infrared irradiator of the present invention having the above configuration is employed for melting snow on railway track surfaces.
In FIG. 2, 5 is a track surface, 6 is a rail, and the road portion to be melted is a convex portion of the road surface 5. The infrared irradiator is installed facing downward toward the track surface 5 at a predetermined height on the side of the track surface 5 that does not interfere with the running of the train.

Therefore, the infrared energy dissipated from the heating element 2 has no heat loss at the reflection plates 7 and 8 (assuming the reflectance is 100%, 037360% between G and X, and 037360% between 'X and H). There is direct radiant energy from the heating element 2 of θQ7360%, and furthermore, between J-X (angle) there is reflected energy of the lower reflector 8 (180-e4.) / 380%, X'
- (angle θ6), the reflection of the upper reflector 7, that is,
By appropriately setting the distance between the position of the heating element 2 and the focal points 7b and 8b of the reflectors 7 and 8, the angle and the ratio of the angle can be changed, and the corresponding infrared irradiation energy can be applied to the irradiation target surface. It is possible to obtain the distribution. In this example, the angle θ5 is made sufficiently smaller than θ6 in consideration of distance attenuation of infrared rays. FIG. 3 shows a distribution diagram of the infrared irradiation density on the road surface 5 based on the concept of FIG. 2. Basically, as shown in the figure,
The irradiation density of two chevrons is shown, and the focal length is set so as to obtain the smoothest possible curve.

FIG. 4 shows a second embodiment according to the invention.
0 is the upper reflector with an elliptical locus cross section, and the focal point is 10
I have it in a and 10b. Reference numeral 11 denotes a lower reflector having an elliptical locus cross section, and has focal points at 10a and llb. still,
Focus 10a of lower reflector 11 and focus 1 of upper reflector 10
In order to match 0a, the joint portions of both are slightly shifted and fixed. Note that L and M indicate the axes connecting the focal points 10a and 10b, and 10a and llb.

The focal length between 10a and 10b of the upper reflector 10 is set shorter than that between lOa and 11b of the lower reflector 11. The axis R and M have a predetermined angle θ7. The infrared rays emitted from the heating element 2 are directly radiated to the outside within the range of the angle θB between the arrows NP.

After the infrared rays reflected by the upper reflector 10 are focused on the focal point 10b, the angle between L and Q is θ! Dissipates into.

Similarly, the infrared rays reflected by the lower reflector 11 are focused on the focal point 11b, and then the angle α between M and R is formed. Dissipates into.

FIG. 5 shows an infrared irradiator constructed as described above installed for melting snow on the track surface 5. Further, the infrared irradiation density on the track surface 5 is shown in FIG. The feature of this second embodiment is that at the angle 07 portion, that is, between the axis LM, the re-reflector 10
, 11 overlap, so the irradiation density in this part becomes high. Example B also aims to average the irradiation density as a whole, but it is particularly effective for applications where it is necessary to intensively increase the irradiation density in the center of the road surface 5.

FIG. 7 shows a third embodiment of the invention of B, in which 13 is an upper reflecting plate having an elliptical locus cross section with focal points 13a and 13b, and 14 is a lower reflecting plate having an elliptical locus cross section having focal points 13a and 14b. Reflector plate, S and T are focal points 13a and 1, respectively.
3b also shows an axis connecting 13a and 14b. The focal length of the upper reflector 13 is set shorter than that of the lower reflector 14. The axes S and T are at an angle θ1. has.

The infrared rays emitted from the heating element 2 are directly radiated to the outside within the range between arrows UV and angle θ, 2. Upper reflector 1
The infrared rays reflected by
and arrow Y, that is, at an angle θ73. The infrared rays reflected by the lower reflector 14 are focused on the focal point 14b and then diffused between the axis T and the arrow W, that is, at an angle θ, 4. Here, since the infrared rays reflected from the reflection plates 13 and 14 are not distributed at all between the angle 072 and the axis S-1, only the direct irradiation from the heating element 2 occurs.

FIG. 8 shows a diagram in which the infrared irradiator constructed as described above is installed for melting snow on the track surface 5. Further, the infrared irradiation density on the track surface 5 is shown in FIG.

The feature of the third embodiment is that the angle θ and the irradiation density in one part are low. In example B, it is possible to aim for an overall average irradiation density, but especially by taking advantage of this feature,
It is also possible to intensively heat a point portion of the rail 6. In each of the first to third embodiments, the upper and lower reflectors are formed as separate bodies, but the same effects can be obtained even if the reflectors are integrated into one piece based on the same concept.

〔Effect of the invention〕

As described above, in the present invention, by shifting the focal lengths of the upper and lower reflectors, it is possible to obtain a more uniform infrared irradiation density distribution than before even if the irradiation target surface is irradiated at an angle. Another advantage is that the irradiation density can be changed arbitrarily if necessary.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of an infrared irradiator showing the first embodiment of this invention, Figure 2 is an explanatory diagram of the irradiator in Figure 1 installed for snow melting, and Figure 3 is the infrared irradiation density in this case. Fig. 4 is a cross-sectional view of an infrared irradiator showing the second embodiment of the present invention, Fig. 5 is an explanatory diagram of this infrared irradiator installed for snow melting, and Fig. 6 is an infrared irradiation diagram in case B. Figure 7 is a cross-sectional view of an infrared irradiator showing the third embodiment of Shimato's invention, Figure 8 is an explanatory diagram of this installed for snow melting, and Figure 9 is a diagram showing the density in this case. FIG. 2 is a distribution diagram showing the infrared irradiation density of 10th
The figure is a sectional view of a conventional infrared irradiator, FIG. 11 is an explanatory diagram of this infrared irradiator installed for snow melting, and FIG. 12 is a distribution diagram showing the infrared ray irradiation density in this case. In the figure, 2 is a heating element, 7 is an upper reflection plate, 7a and 7b are its focal points, 8 is a lower reflection plate, 8a and 8b are its focal points, 10 is an upper reflection plate, 1. Oa, 10b are the focal points, 11 is the lower reflector, 11b is the focus, 13 is the upper reflector, 13a
, 13b is its focal point, 14 is a lower reflector, 14 b (
f is its focus. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masu Oiwa m (2 others) = 11-

Claims (4)

[Claims] (1) Equipped with an upper reflector having an elliptical locus cross section and a lower reflector having an elliptical locus cross section with a different focal length, both of which are arranged so that the focal points located within the reflector coincide or are at approximately the same position. An infrared irradiator characterized in that a heating element is arranged at the focal point or a position close to the focal point. (2) The infrared irradiator according to claim (1), characterized in that the upper reflector and the lower reflector are integrally formed. (3) The infrared irradiator according to claim (1), characterized in that a focal point inside the reflecting plate and two focal points located outside the reflecting plate are arranged in a straight line. (4) The infrared irradiator according to claim (1), characterized in that the axes connecting the focal point inside the reflecting plate and the two focal points located outside the reflecting plate maintain a predetermined angle. .