Electric resistance heating devices – Heating devices – Radiant heater
Patent
1995-02-16
1997-01-07
Jeffery, John A.
Electric resistance heating devices
Heating devices
Radiant heater
250504R, 313114, 362304, 362346, G02B 510, F21V 709
Patent
active
055925820
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The present invention relates to illumination engineering, particularly to technical means for concentration of optical radiation and can prove useful in solving the problems of heat treatment of materials including development of means for soldering and welding of sheet materials. It is practicable to use the disclosed device for body repairs of motor vehicles, welding and soldering difficult conditions, applying some kinds of coatings to the surface of sheet materials, in roofing work, etc.
PRIOR ART
Known in the prior art is a beam machining device comprising a reflector and an extended source of radiation arranged along the optical axis of said reflector wherein the reflecting surface has a profile described by the equation: ##EQU1##
where x,y--coordinates of reflector profile,
2L--length of radiation source,
h--distance from center of source to center of irradiation zone (USSR Inventor's Certificate No.1227908 IPC-5: F-21V 7/04 of 19.12.83). A disadvantage of said device lies in a relatively low illumination intensity of the irradiation zone which is caused by the absence in this geometry of the reflector of at least one direction of radiation of a linear source for which radiation would be collected into a focal point.
Another known beam machining device comprises an extended source of radiation and a concentrating reflector made up of several segments, the surface shape of at least two of them being characterized by the expressions: ##EQU2## for y>0, and ##EQU3## for y<0 where x,y--coordinates of the profile of reflector surface, L--length of the radiating segment of the source, h--distance from the center of the source to the irradiation zone, and .phi..sub.m is the radiation angle of the source corresponding to maximum brightness. The other elements of the reflector surface are constituted by conjugated elements of ellipsoids of revolution (USSR Inventor's Certificate No.1081605 IPC-5:G21B 5/10 of 21.12.82). Another disadvantage of this technical solution lies in a low illuminating intensity of the machining zone ensuing from the fact that, on the one hand, the number of radiation directions along which the radiation of the linear source is collected in one point is limited by the number of maximums of the radiation indicator and, on the other hand, there is no indication of the interrelation between the size of the radiation source, its position in the radiating region and the surface profile of the concentrating reflector. Besides, the optical characteristics of the reflector deteriorate with time due to dusting of its surface with the products formed during beam machining operation.
DISCLOSURE OF THE INVENTION
The main object of the invention resides in providing a device for beam machining capable of producing a higher illuminating intensity of the surface of the treated material and improving the stability of optical properties of the reflector.
The essence of the invention lies in that in the beam machining device comprising an extended source of radiation and a concentrating reflector whose reflecting surface is a surface of revolution whose generatrix is composed of several successively-joined seegments, said generatrix on a certain segment, and the boundaries between the segments are defined by a system of equations. ##EQU4##
where R z--radial and axial coordinates of the surface profile of the i-th segment of the reflector in the cylindrical system of coordinates with the beginning in the middle of the linear radiation source with a length of 2L; R.sub.i, z.sub.i --coordinates of the conjugation points of adjacent segments of the reflector profile indicated by numerals i-1 and i (i-1,2, 3 . . . ); F--axial coordinate of radiation focusing point; the initial segment of the reflector profile from its apex to the point R.sub.1, z.sub.1 is made as a segment of the curve of the 3nd order with a curvature radius at the apex .rho. meeting the condition:
Installed and hermetically sealed on the face end of the concentrating reflector is a transparent protective partitio
REFERENCES:
patent: 3784836 (1974-01-01), Tolliver
patent: 3801773 (1974-04-01), Matsumi
patent: 4106083 (1978-08-01), Wolff
patent: 5038395 (1991-08-01), Lenski
Alexeev Georgy M.
Borisov Mikhail T.
Oparin Mikhail I.
Jeffery John A.
Nath Gary M.
Nauchno-Proizvodstvennya Firma "Adonia"
Nauchno-Proizvodstvennya Firma "MGM"
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