UV light system

Inactive Publication Date: 2009-02-19
JENACT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also a maximum desirable bulb diameter to prevent reabsorbtion of UVC generated by a plasma core which will make the system inefficient at outputting UVC light.
However, the presence of a single bulb limits the power output of the light system which can be obtained efficiently.

Method used

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second embodiment

[0025]the invention is illustrated in FIG. 3. In FIG. 3, the UV light system is provided with a second inner conductor 17. The second inner conductor is also provided with a plurality of projections 19, each of the projections 19 being in contact with on e of the bulbs in the light system. The second inner conductor 17 is coupled using a second coupler 21 to microwave source such as a magnetron. The microwave source may be connected to both the inner conductors 16 and 17 or, alternatively, separate microwave sources may be connected to each of the inner conductors 16, 17.

third embodiment

[0026]the invention is illustrated in FIGS. 4 and 5. In FIG. 4, the inner conductor 16 extends through the length of the UV light system. The extended inner conductor 12 promotes microwave energy transmission through the length of the UV light system. Optionally, the end of the inner conductor 16 furthest from the microwave source may be provided with further projections 22 as illustrated in FIG. 5. This enables the energy to be split evenly between the electrodeless bulbs 12. Additionally, because the electrodeless bulbs 12 are receiving microwave energy at both ends the amount of UV light generated by them is increased.

fourth embodiment

[0027]the invention is illustrated in FIGS. 6 and 7. In FIG. 6, the plurality of electrodeless bulbs 12 are arranged around a structural element 24. The structural element 24 has a plurality of concave surfaces 26 which form longitudinal cavities each cavity being arranged to receive one bulb 12. The surfaces of the longitudinal cavities act to reflect light emitted from the UV light bulbs 12 and to prevent light emitted by a bulb 12 being transmitted onto, and absorbed by, adjacent bulbs 12.

[0028]The structural element 24 is further provided with a hollow bore (‘core’) 28 forming a path that runs through the centre of the structural element 24. The inner conductor 16 passes through this bore 28.

[0029]Optionally, the inner conductor 16 is provided with projections 20 at either end (not shown). This means that the electrodeless UV light bulbs 12 can be energised at both ends, thereby enabling a more even distribution of UV emissions from each of the UV bulbs 12 in the light system.

[0...

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Abstract

The light system has a plurality of bulbs configured to emit light when energised by microwaves, an outer conductive element which is at least partially transmissive to UV light; and an inner conductor situated within the outer conductive element. The inner conductor of the light system coupled directly to a microwave source. Additionally, the inner conductor is provided with a plurality of projections, each projection contacts one of the bulbs to promote even distribution of the microwave energy.

Description

FIELD OF THE INVENTION[0001]This invention relates to an improved UV light system having electrodeless UV bulbs that are energised by microwave energy. The UV light system may be used submerged in fluids or gases for the purpose of, for example, water or air purification, disinfection, sanitization or other treatment.BACKGROUND OF THE INVENTION[0002]UV light is used for many different purposes including, for example, the use of UVC irradiation for the purification or other treatment of fluids such as air or water. U.S. Pat. No. 6,693,382 entitled “Control system for microwave powered light sources” discloses that there is a maximum desirable power density for UVC emitting electrodeless light sources if UVC efficiency is to be maintained above the desired minimum of 20-30%. There is also a maximum desirable bulb diameter to prevent reabsorbtion of UVC generated by a plasma core which will make the system inefficient at outputting UVC light. It is, therefore, often advantageous to max...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCA61L9/20C02F1/325H01J65/044C02F2201/3228C02F2303/04C02F2201/3227H01J61/547
InventorBRIGGS, DAVIDLITTLE, RICHARD
OwnerJENACT