US3811044A

US3811044A - Light shield and cooling apparatus

Info

Publication number: US3811044A
Application number: US00305638A
Authority: US
Inventors: T Meador
Original assignee: National Aeronautics and Space Administration NASA
Current assignee: National Aeronautics and Space Administration NASA
Priority date: 1972-11-10
Filing date: 1972-11-10
Publication date: 1974-05-14
Anticipated expiration: 1991-05-14

Abstract

A light shield and cooling apparatus for a high intensity ultraviolet lamp including water and high pressure air for cooling and additional apparatus for shielding the light and suppressing the high pressure air noise.

Description

United States Patent [191 Meador, Jr. May 14, 1974 [5 LIGHT SHIELD AND COOLING 1,630.057 5/!927 Buttolph 240/47 x APPARATUS 3,242,3l4 3/1966 Eckles 250/504 X 1,435,192 ll/l922 Anderson... 240/47 X [75] Invent r: h mas Meador, Jr-, ampt n. 2,837,965 6/l958 Goldsmith 3.53/54 [73] Assignee: The United States of America as represented by the Administrator of Primary ExaminerRichard M. Sheen the National Aeronautics and Space Attorney, Agent, or FirmHoward J. Osborn; Wallace Administration, Washington, DC. J. Nelson; John R. Manning [22] Filed: Nov. 10, 1972 21 Appl. No.: 305,638

[57] ABSTRACT [52] US. Cl 240/47, 353/54, 353/61 [51] Int. Cl. F2lv 29/00 [58] Field of Search 240/47; 352/202; 353/52, A sheld apparatus a 353/54 250/504 493 sity ultraviolet lamp including water and high pressure air for cooling and additional apparatus for shielding [56] References Cited the light and suppressing the high pressure air noise.

UNITED STATES PATENTS I Q 3,626,176 12/1971 Tsugami 240/47 3 Claims, 4 Drawing Figures H I 44 I a 1T (2 LIGHT SHIELD AND COOLING APPARATUS ORIGIN OF THE INVENTION BACKGROUND OF THE INVENTION The invention relates generally to the shielding and cooling of a high intensity light and more specifically to apparatus for cooling a high intensity ultraviolet lamp with water and high pressure air while shielding the lamp so as to confine the intense light to a desired area and so as to suppress the noise created by the high pressure air.

In the consideration of material for possible use in outer space, tests must be conducted to determine the effect of ultraviolet light on such materials for extended periods of time. High intensity quartz-mercury lamps of the BI-I-6 type can produce ultraviolet light for therequired period but their use has been restricted due to their tendency to explode from overheating. Lamps of this type attain temperatures over 1,000F. and are extremely dangerous when they explode. Attempts have been made in the prior'art to cool lamps of this type using high pressure air, but the'noise levels generated by the air were not acceptable to personnel working nearby. Therefore there is a definite need for an improved apparatus for cooling high intensity ultraviolet lamps including apparatus for shielding nearby personnel from the intense light given off and from the danger of lamp explosions.

Accordingly, it is an object of the present invention to provide an apparatus for cooling a high intensity ultraviolet lamp so as to reduce the tendency of the lamp to explode.

Another object of the present invention is to provide an improved apparatus for shielding the intense light emitted by a high intensity ultraviolet lamp.

Another object of the present invention is to lower the noise level of a high pressure air cooling system to an acceptable level.

SUMMARY OF THE INVENTION The foregoing and other objects are attainable in the present invention by providing a circular metallic jacket around a high intensity ultraviolet lamp so as to limit the path of high intensity light given off by the lamp. A hollow coil is wound around the outer surface of the jacket such that coolant flowing therethrough serves to keep the jacket cool. An air inlet extends through the jacket to the lamp. The jacket and coil are enclosed in a shield spaced from the jacket. High pressure air is pumped through the air inlet in the jacket to cool the lamp, the open volume between the coil and the metallic shield serving as an expansion chamber to suppress the high pressure air noise.

The use of liquid coolant circulating through the coils surrounding the jacket and high pressure air serves to cool the lamp thereby reducing its tendency to explode from over-heating, wherein the enclosing of the lamp serves to limit the path of the high intensity light and lowers the high pressure air noise to an acceptable level. 1

BRIEF DESCRIPTION OF THE DRAWINGS A more complete appreciation of the present invention and many more of the attendant advantages thereof will be more readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:

FIG. 1 is a perspective view of the shielding and cooling apparatus of the present invention;

FIGS. 2a and 2b are views of the two annular covers for the shielding and cooling apparatus shown in FIG. 1; and

FIG. 3 is a top view'of the apparatus with the annular cover removed.

DETAILED DESCRIPTION OF THE INVENTION 2 Referring now to the drawings, the light shield and cooling apparatus is shown in FIG. 1 and designated generally by reference numeral 10. Light shield 10 includes an annular jacket 12 formed of a suitable conductive material, such for example, copper. A plurality of circular openings 14 are circumferentially disposed in spaced adjacency about the perimeter of jacket 12. An air inlet 16 extends perpendicularly through one side wall ofjacket 12. A coolant coil 18, having a coolant inlet 22 and a coolant outlet 24 in fluid connection therewith, is disposed in intimate contact with and substantially surrounding jacket 12.

An exterior shield 26 surrounds a major portion of and is spaced from jacket 12 and coils 18 such that frontal access to air inlet 16, coil inlet 22 and coil outlet is maintained.

Referring now to FIGS. 2a and 2b, an annular cover 28, having a central opening 38 formed therein, is mounted onto the upper edge of shield 26. A second annular cover 30, having a removable cover plate 32 attached thereto, is mounted onto the lower edge of shield 26 such that an inner chamber 36 is formed between shield 26, jacket 12, annular cover 28 and annular cover 30. Annular cover 28 and annular cover 30, having cover plate 32 attached thereto, serve with shield 26 to form a unitary structure enclosing jacket 12.

Referring now to FIG. 3, a high intensity quartzmercury lamp 34, mounted on fixture 40, is shown within the annular opening of jacket 12. Air nozzles 42, in fluid communication with air inlet 16, leading from a high pressure air source (not shown), are aimed directly at lamps 34. The interior surface of jacket 12 and the interior surface of shield 26 are coated with a black radiation absorbent material, while the exterior surface of shield 26 is coated with a white radiation reflective material. Electrical power receptable 44 is mounted in shield 26 and is in electrical connection with fixture 40 and lamp 34 in a conventional manner.

OPERATION the operation of the present shielding and cooling apparatus, receptable 44 is connected to a suitable electric power source to activate lamp 34 and a liquid coolant supply, such for example water, is connected to coil inlet 22. The coolant flows through coil 18 thereby directly cooling jacket 12 and indirectly cooling quartzmercury lamp 34. At the same time high pressure air is pumped through air inlet 16 and air nozzles 42 such that the air impinges on and directly cools lamp 34.

The high pressure air flows from the annular opening in jacket 12 through circular openings 14 formed in jacket 12 and into inner chamber 36. The air then escapes from inner chamber 36 through central opening 38 formed in cover 28 and the portion of shield 26 which does not completely surround jacket 12. Inner chamber 36 serves as a noise diffusion chamber such that the noise generated by the air escaping is reduced to a level acceptable to nearby personnel. Cover plate 32 is conventionally attached to cover 30 and is readily removed whenever lamp 34 requires servicing or whenever it is desired to monitor the intensity of the lamp.

Jacket 12 surrounding lamp 34 serves to limit the path of the intense light rays generated therefrom whereby the rays are directed only at the material to be tested such that nearby personnel are protected from the hazardous rays. Jacket 12 also serves as a guard to protect nearby personnel from injury in the event lamp 34 explodes.

The radiation absorbent material coated on the interior surfaces of shield 26 and jacket 12 and the radiation reflective material on the exterior surface of shield 26 serve to reduce the transmission of heat through the apparatus and also serve to remove radiation in the apparatus. Shield 26 is readily attachable to any suitable support structure so as to direct the light rays in the desired direction.

It is to be understood that the form of the present invention shown and described herein is to be taken as the preferred embodiment only, and that the invention may be practiced otherwise than as specifically described. The invention is not limited to the preferred embodiment and other variations and modifications will be readily apparent to those skilled in the art without departing from the spirit and scope of the appended claims.

What is claimed as new and desired to be secured by Letters Patent of the United States is:

1. Apparatus for shielding personnel from lamp breakage, ultraviolet radiation, heat, and high intensity light hazards while at the same time reducing the noise level of high pressure air flow used in cooling the lamps and permitting in-situ service of the lamps. comprising:

a high intensity ultraviolet lamp and appropriate holding fixture;

an open ended cylindrical jacket constructed of heat conductive material positioned around said lamp to form an enclosure accessible only at both ends so as to define a path of radiation for said lamp which is coaxial to said cylindrical jacket;

conduit means in communication with a high pressure air source extending into saidjacket in a direction transverse to the axis of said cylindrical jacket for direct air cooling of said lamp;

coil means substantially surrounding and attached in intimate contact with said cylindrical jacket;

coolant inlet and coolant outlet means in fluid connection with said coil means for circulating a flow of liquid coolant in said coil means to keep said jacket relatively cool when said lamp is in operation;

a cylindrical metallic shield coaxial with said cylindrical jacket surrounding the major portion of said jacket and said coil means and spaced therefrom, a first annular member having a central opening therein sufficiently large to permit radiation from said lamp to be directed upon external objects attached to one open end of said jacket and a second annular member attached to the other open end of said jacket, said second annular member having a service access port therein, and a cover plate removably covering said service access port so that said lamp can be serviced and replaced; and

means for connecting said exterior shield, said cylindrical jacket, and said coil means into a unitary structure so as to confine radiation from said lamp to the desired direction.

2. The apparatus of claim 1 wherein the space between said jacket and said shield defines an expansion chamber, and said cylindrical jacket has a plurality of openings permitting expulsion of the high pressure air from within said jacket into said expansion chamber prior to the passage of the air from said apparatus to thereby reduce the air pressure noise level.

3. The apparatus of claim 1 wherein the interior surface of said jacket adjacent to said lamp is provided with a black radiation absorbent coating.

Claims

1. Apparatus for shielding personnel from lamp breakage, ultraviolet radiation, heat, and high intensity light hazards while at the same time reducing the noise level of high pressure air flow used in cooling the lamps and permitting in-situ service of the lamps. comprising: a high intensity ultraviolet lamp and appropriate holding fixture; an open ended cylindrical jacket constructed of heat conductive material positioned around said lamp to form an enclosure accessible only at both ends so as to define a path of radiation for said lamp which is coaxial to said cylindrical jacket; conduit means in communication with a high pressure air source extending into said jacket in a direction transverse to the axis of said cylindrical jacket for direct air cooling of said lamp; coil means substantially surrounding and attached in intimate contact with said cylindrical jacket; coolant inlet and coolant outlet means in fluid connection with said coil means for circulating a flow of liquid coolant in said coil means to keep said jacket relatively cool when said lamp is in operation; a cylindrical metallic shield coaxial with said cylindrical jacket surrounding the major portion of said jacket and said coil means and spaced therefrom, a first annular member having a central opening therein sufficiently large to permit radiation from said lamp to be directed upon external objects attached to one open end of said jacket and a second annular member attached to the other open end of said jacket, said second annular member having a service access port therein, and a cover plate removably covering said service access port so that said lamp can be serviced and replaced; and means for connecting said exterior shield, said cylindrical jacket, and said coil means into a unitary structure so as to confine radiation from said lamp to the desired direction.