Ultra-violet sterilizer having a fluid flow diffuser plate

Claim 1

In a fluid sterilization apparatus having a chamber defined by the space between an outer cylindrical housing and an ultraviolet radiation source coaxially mounted therein, the radiation source irradiating fluid flowing in the chamber from a source of fluid, and a fluid inlet channel at one end and a fluid outlet channel at the other end of the chamber, the improvement comprising: fluid flow deflector means having a chamber inlet orifice connecting said chamber to the inlet channel and disposed perpendicular to the longitudinal axis of and in close proximity to a portion of the radiation source, said portion of the radiation source being in the flow path of fluid emerging from said inlet orifice such that fluid flowing from the source of fluid through the inlet channel and emerging from the inlet orifice strikes a portion of the radiation source and is deflected into non-coincident flow paths in said chamber, and an annulus shaped device extending substantially transversely to and being coaxial with the longitudinal axis of the ultraviolet source and positioned in the chamber between the radiation source and the cylindrical housing, the annulus device having a plurality of rigid non-overlapping vanes and being positioned downstream of but in close proximity to the inlet orifice, each of said vanes being essentially in the form of a step extending in the direction of the longitudinal axis of the radiation source, said step being formed by first and second horizontal treads interconnected by a vertical riser, said first tread being spaced axially upstream of said second tread, and wherein said step is further formed by a concave surface extending between the leading edges of the first and second treads, said leading edges being those edges of the downstream portion of each tread which first contact the inflowing fluid, whereby said concave surface is integral with said vertical riser and said first tread, such that the fluid deflected into non-coincident flow paths in said chamber after striking the radiation source, passes over the concave surfaces of the vanes and is directed thereby into turbulent rotational paths flowing downstream through the chamber toward the fluid outlet channel.