Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – With means applying electromagnetic wave energy or...
Patent
1993-05-26
1994-09-20
Walsh, Donald P.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
With means applying electromagnetic wave energy or...
42218607, B01J 1912
Patent
active
053487095
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to apparatus for generating ozone and particularly to such apparatus of the type which includes an elongate tubular assembly which, in use, is generally vertically oriented.
Ozone generators of the tubular type generally have a construction including an elongate annular housing usually made from stainless steel, and an electrode, also of stainless steel, disposed substantially co-axially within the housing, defining an annular space therebetween through which gas containing oxygen (O.sub.2) may flow. A glass dielectric tube is normally disposed in part of this annular space and is fastened at both its top and bottom ends in a position where the dielectric tube forms a liner along the entire length of the housing. In use, an a.c. voltage supply is connected to the electrode, (the housing being connected to earth) so that an electric field is generated in the annular space. The electric discharge across the space causes the oxygen (O.sub.2) flowing through the space to be converted into ozone (O.sub.3).
The dielectric tube is fastened at both its top and bottom ends and therefore is constrained to resist thermal expansion stresses. Furthermore, the a.c. voltage used in the generator causes the dielectric tube to vibrate and because the tube is locked in position, its movement is restricted and this also causes stressing of the tube. Thus the dielectric tube has a limited life. A further problem is that such tubes often need to be removed to be cleaned and the complex structure of some ozone generators makes the removal of such tubes difficult.
It is an object of the present invention to provide a new and improved ozone generator.
According to the present invention there is provided apparatus for generating ozone comprising top and bottom chambers interconnected by an elongate tubular assembly the axis of said assembly being generally vertical, wherein said assembly includes an elongate electrode concentrically located within but spaced apart from an annular-elongate conductive member, a concentric elongate annular dielectric being disposed in and partly filling the space between the electrode and the conductive member so as to define annular passageway means for flow of gas between said top and bottom chambers, said elongate annular dielectric being suspended at its upper end within the top chamber and being dimensioned diametrically so as to be free from contact with both the electrode and the conductive member, whereby said passageway means is formed by radially inner and outer annular passageways.
Preferably said elongate annular dielectric is suspended by an O-ring made of resilient material and which resiliently grips the dielectric, the O-ring resting on a support surface formed within the top chamber. Conveniently said support surface is formed by a support plate which divides the top chamber into upper and lower compartments communicating with said inner and outer annular passageways respectively. Conveniently also said support surface is provided by a shoulder within the thickness of the support plate, the shoulder being surrounded by an axially extending wall dimensioned to centralise the dielectric and its O-ring with respect to the electrode. The support plate may be made of PVC.
Preferably said top chamber includes a releasable cover plate which may be removed to facilitate access to said dielectric.
Preferably also the top and bottom chambers each have a port for inlet/outlet transmission of gas. Conveniently both the upper and lower compartments of said top chamber are provided with a gas transmission port.
Preferably also the part of the assembly which extends between the top and bottom chambers is externally surrounded by means forming a water jacket.
Preferably also the elongate conductive member of the assembly is secured to the lower plate of the top chamber and the upper plate of the bottom chamber. Advantageously said assembly is one of a plurality of similar assemblies each of which connect said top and bottom chambers.
Embodiments of the present invention
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Jenkins Daniel
Triogen Limited
Walsh Donald P.
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