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GB2628097A - A chamber for use in a fluid sterilisation unit - Google Patents

A chamber for use in a fluid sterilisation unit Download PDF

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Publication number
GB2628097A
GB2628097A GB2303576.9A GB202303576A GB2628097A GB 2628097 A GB2628097 A GB 2628097A GB 202303576 A GB202303576 A GB 202303576A GB 2628097 A GB2628097 A GB 2628097A
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GB
United Kingdom
Prior art keywords
chamber
fluid
light source
disposed
ultraviolet light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
GB2303576.9A
Other versions
GB202303576D0 (en
Inventor
Hoddinott Rhydian
Fisher James
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Biozone Scientific Group Ltd
Original Assignee
Biozone Scientific Group Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Biozone Scientific Group Ltd filed Critical Biozone Scientific Group Ltd
Priority to GB2303576.9A priority Critical patent/GB2628097A/en
Publication of GB202303576D0 publication Critical patent/GB202303576D0/en
Publication of GB2628097A publication Critical patent/GB2628097A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
    • F24F8/22—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using UV light
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/18—Radiation
    • A61L9/20—Ultraviolet radiation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Epidemiology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Physical Water Treatments (AREA)

Abstract

A chamber for a fluid sterilisation unit, comprising an ultraviolet light source disposed within the chamber; at least one fluid inlet; at least one fluid outlet; the chamber having an inner wall with a substantially circular cross-section, wherein the inlet and outlet are substantially tangential to the chamber inner wall. The chamber may comprise at least two inlets, which may be disposed at first and second longitudinal ends of the chamber, or each disposed at first longitudinal end and equally spaced about a longitudinal axis. The chamber may comprise two outlets. The UV light source may be disposed centrally within the chamber, extending along a longitudinal axis. The chamber may comprise helical vane(s) disposed about the UV source, configured to control a swirl fluid flow from inlet to outlet, and may extend from the first to the second longitudinal end of the chamber. Also claimed is a fluid sterilisation unit comprising the chamber, a fluid source in communication with the fluid inlet, an ultraviolet light source driver, and a housing configured to house the chamber, fluid source, and UV light source driver. Also claimed is use of the chamber for sterilising a fluid using an ultra-violet light.

Description

A CHAMBER FOR USE IN A FLUID STERILISATION UNIT
Technical Field
The present disclosure relates to a chamber for use in a fluid sterilisation unit and in particular, to a chamber comprising an ultraviolet light source disposed within the chamber.
Backqround Ultraviolet (UV) light is widely known as an effective means of sterilisation by ultraviolet radiation. Known air sanitation systems and/or fluid sterilisation units comprise of an ultraviolet lamp, a ballast which is the power electronics to ignite said ultraviolet lamp, and a fan which is used to force fluid convection into the exposure area of the ultraviolet lamp. The ultraviolet lamp is configured to irradiate the fluid, usually air, with ultraviolet light. However, the known sterilising processes using an ultraviolet lamp can be inefficient and costly. In particular, known systems rely on a passive method of moving the fluid into and out of the sterilisation unit. Furthermore, the requirement to reduce, or prevent, the ultraviolet radiation from escaping the sterilisation device has led to inefficient devices with substantially occluded fluid flow pathways.
The present inventors have appreciated that it would be desirable to provide a chamber for use in a fluid sterilisation unit that more effectively and more efficiently directs the flow of the fluid into the vicinity of the ultraviolet light source.
Summary of the Disclosure
Embodiments described herein provide a chamber for use in a fluid sterilisation unit and a fluid sterilisation unit itself as defined in the appended independent claims, to which reference should now be made. Preferred or advantageous features of the disclosure are set out in the dependent sub-claims.
According to a first aspect of the present disclosure, there is provided a chamber, for use in a fluid sterilisation unit. The chamber comprises an ultraviolet light source disposed within the chamber. The chamber further comprises at least one fluid inlet and at least one fluid outlet. The chamber has an inner wall with a substantially circular cross-section. The at least one fluid inlet and the at least one fluid outlet are substantially tangential to the inner wall of the chamber.
The chamber according to the first aspect advantageously controls the flow of the fluid around the ultraviolet light source. The ultraviolet light source is configured to irradiate the fluid passing through the chamber, in particular, the ultraviolet light source is configured to uniformly irradiate the fluid to aide efficiency of the irradiation process.
The chamber directs and controls the fluid to be sterilised in the presence of an ultraviolet light source. The chamber is configured to ensure that the fluid is exposed to the ultraviolet light source. The chamber according to the present disclosure is also configured to increase the exposure time of the fluid to the ultraviolet light source for any given fluid flow rate. Increasing the exposure time advantageously maximises the irradiance of the fluid within the chamber and in turn improves the fluid sterilisation process.
The at least one fluid inlet is preferably configured to receive a fluid from a fluid source such that a fluid to be sterilised/irradiated enters the chamber through the at least one fluid inlet. The at least one fluid inlet being substantially tangential to the inner wall of the chamber is advantageous as it efficiently directs the flow of the fluid into the vicinity of the ultraviolet light source.
The at least one fluid outlet is preferably configured to provide an exit for the fluid to leave the chamber. In other words, the at least one fluid outlet is configured to discharge or disperse the irradiated fluid outside the chamber. The at least one fluid inlet and the at least one fluid outlet being substantially tangential to the inner wall of the chamber advantageously provide an entry point and exit point in the direction of the fluid flow.
Further, the configuration of the chamber and in particular the configuration of the at least one fluid inlet and at least one fluid outlet provides an effective means of martialling the flow of a fluid provided into a centrifugal motion about the radius of the ultraviolet light source.
This in turn, as discussed above, advantageously increases the exposure time of the fluid about the ultraviolet light source, for any given fluid flow rate, and also allows the fluid to travel from the at least one fluid inlet to the at least one fluid outlet efficiently. Efficient fluid flow advantageously reduces the burden on the fluid source provider, such as a fan.
Advantageously, the at least one fluid inlet and the at least one fluid outlet are provided substantially tangential to the inner wall of the chamber such that the fluid flow within the chamber is substantially centrifugal about a longitudinal axis of the chamber.
According to the first aspect of the present disclosure, the chamber preferably has an inner wall with a substantially circular cross-section.
Preferably, the chamber has an outer wall with a substantially circular cross-section.
Alternatively, the chamber may have an outer wall with a substantially rectangular cross-section, for example. Other suitable cross-section shapes of the outer wall will be appreciated by the skilled person.
Optionally, the at least one fluid inlet is located at a first longitudinal end of the chamber. Optionally, the chamber comprises at least two fluid inlets.
Preferably, the chamber comprises two fluid inlets.
Alternatively, the chamber may comprise more than two fluid inlets. The chamber comprising at least two fluid inlets advantageously provides additional entry points for the fluid into the chamber and as such may increase the efficiency of fluid flow through the chamber. Furthermore, the chamber comprising at least two fluid inlets may mean that each inlet can have a smaller fluid source provider. This may further assist with providing a more energy efficient chamber.
Optionally, a first one of the at least two fluid inlets is disposed at a first longitudinal end of the chamber, and a second one of the at least two fluid inlets is disposed at a second longitudinal end of the chamber. In other words, the first one of the at least two fluid inlets and the second one of the at least two fluid inlets may be located or disposed at or towards opposing longitudinal ends of the chamber. Disposing the first one of the at least two fluid inlets at a first longitudinal end of the chamber and the second one of the at least two fluid inlets at a second longitudinal end of the chamber further assists in providing a chamber effective at exposing the fluid to the ultraviolet light source. Furthermore, a first one of the at least two fluid inlets may be disposed at least towards a first longitudinal end of the chamber, and a second one of the at least two fluid inlets may be disposed at least towards the second longitudinal end of the chamber.
Optionally, the at least one fluid outlet is disposed between a first longitudinal end of the chamber and a second longitudinal end of the chamber. Preferably, the at least one fluid outlet is disposed between a first longitudinal end of the chamber and a second longitudinal end of the chamber such that the at least one fluid outlet is substantially equidistant from the first longitudinal end and the second longitudinal end of the chamber.
Optionally, the at least one fluid outlet is disposed on an opposing side of the chamber to the at least two fluid inlets.
Optionally, the at least one fluid outlet has a greater cross-sectional area than the at least one fluid inlet.
Alternatively, each of the at least two fluid inlets is disposed at the first longitudinal end of the chamber. In particular, each or the at least two fluid inlets may be disposed, located or situated on or at the end wall of the chamber at the first longitudinal end of the chamber. Preferably, the at least two fluid inlets are substantially equally spaced about a longitudinal axis of the chamber. More preferably, when there are two fluid inlets, the two fluid inlets are diametrically opposed. This ensures the fluid flow from each of the fluid inlets is in the same swirl direction. The at least two fluid inlets being substantially equally spaced about a longitudinal axis of the chamber advantageously assists with providing centrifugal (swirling) motion of the fluid flow about the ultraviolet light source and as such advantageously provides a more efficient chamber. Further, the at least two fluid inlets being located at a first longitudinal end of the chamber and equally spaced about a longitudinal axis of the chamber provides a compact and space efficient chamber for a fluid sterilisation unit.
Optionally, the chamber comprises at least two fluid outlets. This provides at least two ducts or paths for the fluid to exit or be discharged from the chamber. This may advantageously provide more efficient fluid flow and a more efficient discharge process of the irradiated fluid. This in turn provides an improved and more efficient sterilisation process.
Optionally, the at least two fluid outlets are disposed at the second longitudinal end of the chamber. In particular, each of the at least two fluid outlets may be disposed, located or situated at the end wall of the chamber at the second longitudinal end of the chamber.
Preferably, the at least two fluid outlets are disposed at the second longitudinal end when the at least two fluid inlets are disposed at the first longitudinal end of the chamber.
Preferably, when disposed at the second longitudinal end, the at least two fluid outlets are substantially equally spaced about a longitudinal axis of the chamber. More preferably, when there are two fluid outlets, the two fluid outlets are diametrically opposed.
Optionally, the or each at least one fluid inlet protrudes from the chamber. In other words, the or each at least one fluid inlet may protrude or project outwardly from the chamber.
The or each at least one fluid inlet protruding or projecting from the chamber provides a conduit to direct the fluid into the chamber.
Preferably, the or each at least one fluid inlet protrudes from the chamber, such that at least a first portion of an inner wall of the or each at least one fluid inlet substantially aligns with the inner wall of the chamber. Advantageously, this provides a smooth and efficient fluid flow path for the fluid to enter the chamber through the at least one fluid inlet. Further, the at least a first portion of an inner wall of the or each at least one fluid inlet substantially aligning with the inner wall of the chamber may advantageously provide a chamber that is easier to mould as a single part comprising the chamber and the at least one fluid inlet.
Optionally, at least a second portion of an inner wall of the or each at least one fluid inlet substantially aligns with an end wall of the chamber.
Optionally, the or each at least one fluid inlet and/or the or each at least one fluid outlet has a substantially rectangular cross-section.
Alternatively, the or each at least one fluid inlet and/or the each at least one fluid outlet may have an alternative cross-section, such as circular.
Optionally, the or each at least one fluid inlet and/or the or each at least one fluid outlet has a substantially constant cross-sectional area along its length.
Alternatively, the or each at least one fluid inlet and/or the or each at least one fluid outlet has a variable cross-sectional area along its length. For example, the cross-sectional area may increase as the length of the at least one fluid inlet increases.
Optionally, the or each at least one fluid outlet is configured to exhaust to atmosphere.
This advantageously provides a means for disposing, releasing or exhausting the irradiated fluid to the atmosphere. This also results in an efficient irradiation process and an efficient fluid flow as it is provides an exit path to outside the chamber for the irradiated fluid. Preferably, the at least one fluid inlet and the at least one fluid outlet are configured to maximise the dwell time of the fluid within the chamber for a given fluid flow rate.
Optionally, the chamber further comprises at least one diffuser coupled respectively to the or each at least one fluid outlet. A diffuser being a device that reduces the velocity of the fluid flow by increasing the static pressure of the fluid. The chamber further comprising at least one diffuser coupled respectively to the or each at least one fluid outlet advantageously controls the fluid flow and provides a more uniform flow. The diffuser is configured such that it increases in cross-sectional area from the portion of the diffuser coupled to the fluid outlet to the portion of the diffuser that exhausts to atmosphere. In particular, the diffuser is configured such that cross-sectional area increases as it extends away from the outlet. The at least one diffuser may be coupled respectively to the or each at least one fluid outlet by welding for example. Other methods of coupling the diffuser to the at least one fluid outlet will be appreciated by the skilled person.
Optionally, the ultraviolet light source is disposed centrally within the chamber, extending along a longitudinal axis thereof. Housing the ultraviolet light source centrally within the chamber advantageously allows the ultraviolet light source to irradiate radially the inside of the chamber. Further, this configuration ensures that substantially all the fluid within the chamber is irradiated by the ultraviolet light source.
Additionally, the ultraviolet light source may extend along the longitudinal axis of the chamber from the first longitudinal end to the second longitudinal end. This advantageously ensures that the amount fluid entering the chamber through the or each at least one outlet is exposed to the ultraviolet light source is maximised and is irradiated as a result.
Preferably, the ultraviolet light source is ultraviolet-c (UV-C) light. This is advantageous as UV-C light acts as a disinfectant and is effective for irradiating fluid. More preferably, the ultraviolet light has a wavelength between the range 100nm to 280nm.
Preferably, the chamber is a closed chamber. In particular, the chamber is preferably a closed chamber when the ultraviolet light source is housed centrally within the chamber.
Alternatively, the chamber may be comprised of a lower portion and an upper lid portion.
In other words, the chamber may comprise a lid portion which can be removed and/or moved from an open position to a closed position. The lid portion may be moved from an open position to a closed position via a hinge joint. This may advantageously provide easy access to the interior of the chamber. This may be beneficial for cleaning or maintenance purposes,
for example.
Additionally, the chamber may be a cylindrical chamber. Alternative shapes will be appreciated by the skilled person.
Optionally, the or each at least one fluid inlet is coupled to a fluid source. The fluid source is configured to provide a fluid through the fluid inlet to which is it coupled. The fluid source may be a fan. In particular, the fluid source may be a blower fan. Alternative fluid sources will be appreciated by the skilled person.
Optionally, the chamber comprises at least one helical vane disposed about the ultraviolet light source and configured to control a swirl flow of the fluid from the or each at least one fluid inlet to the or each at least one fluid outlet. The at least one helical vane advantageously controls the flow of fluid to increase the exposure time (dwell time) about the ultraviolet light source housed within the chamber for any given fluid flow rate.
Optionally, the at least one helical vane extends from the first longitudinal end of the chamber to the second longitudinal end of the chamber.
Optionally, the number of helical vanes is between about one to about six helical vanes. Preferably, the number of helical vanes is two. In particular, the number of helical vanes may be equal to the number of inlets. For example, if there are two fluid inlets there may be two helical vanes. The two helical vanes may be configured to intertwine.
Optionally, the length of the chamber may be between about 150mm to about 400mm. The length being the distance from the first longitudinal end of the chamber to the second longitudinal chamber. The number of turns of the helical vane may increase as the length of the chamber increases. Preferably, the number of turns may be between about 1 and about 5 per 150mm of length.
Preferably, the at least one helical vane comprises a recess, cutaway or indent configured to conform to the shape of the ultraviolet light source. The cutaways in the at least one helical vane are configured such that the chamber comprising the at least one helical vane can receive the ultraviolet light source. In particular, the cutaway/recess in the helical vane advantageously ensures the ultraviolet light source is received within the chamber without causing any damage to the ultraviolet light source or the at least one helical vane.
In use, when the ultraviolet light source is housed centrally within the chamber, the ultraviolet light source may be surrounded by the at least one helical vane such that there is a gap between the ultraviolet light source and the at least one helical vane. The gap may be 30 between about 0.5 mm and about 5 mm, preferably between about 1 mm and about 3 mm. Optionally, the chamber may be formed of sheet metal.
Optionally, the helical vanes may be made of a metal, preferably titanium. Preferably, the helical vanes are coated with titanium dioxide.
According to a second aspect of the present disclosure, there is provided a fluid sterilisation unit comprising a chamber. The chamber comprises an ultraviolet light source disposed within the chamber, at least one fluid inlet and at least one fluid outlet. The chamber has an inner wall with a substantially circular cross-section. The at least one fluid inlet and the at least one fluid outlet are substantially tangential to the inner wall of the chamber. The fluid sterilisation unit further comprises a fluid source in fluid communication with the or each at least one inlet, an ultraviolet light source driver and a housing configured to house the chamber, the fluid source and the ultraviolet light source driver.
The chamber may be a chamber as substantially described herein, for example a chamber according to the first aspect of the present disclosure.
The fluid source may be a fan or a blower fan that is configured to provide fluid through the at least one inlet to which it is coupled. Advantageously, because the chamber is configured to provide efficient fluid flow and in turn maximise the irradiance of the fluid by the ultraviolet light source, the fluid source may be smaller, e.g. lower voltage/require less energy, compared to the fluid sources of the prior art units for any given fluid flow rate. This is because the pressure drop from the at least one inlet to the at least one outlet is reduced because of the configuration of the chamber.
The ultraviolet light source driver is configured to drive/power the ultraviolet light source.
The housing configured to house the chamber may be of any shape. The chamber may be mounted within the housing. In use, the housing may be mounted to a surface, such as a wall for example.
According to a third aspect of the present disclosure, there is provided a use of the chamber, for sterilising a fluid using an ultraviolet light. The chamber comprises an ultraviolet light source disposed within the chamber. The chamber further comprises at least one fluid inlet and at least one fluid outlet. The chamber having an inner wall with a substantially circular cross-section. The at least one fluid inlet and the at least one fluid outlet are substantially tangential to the inner wall of the chamber.
The chamber may be a chamber as substantially described herein, for example a chamber according to the first aspect of the present disclosure.lt will be appreciated that features described in relation to one aspect of the present disclosure may also be applied equally to all of the other aspects of the present disclosure. Features described in relation to the first aspect of the present disclosure may be applied equally to the second aspect of the present disclosure and vice versa. For example, features of the chamber described in relation to the first aspects may be applied, mutatis mutandis, to the fluid sterilisation unit of the second aspect.
It will further be appreciated that particular combinations of the various features described and defined in any aspects of the invention may be implemented and/or supplied and/or used independently.
Description of Specific Embodiments of the Disclosure Specific embodiments of the disclosure will now be described with reference to the figures, in which: Figure 1 shows a perspective view of a chamber according to an example embodiment; Figure 2 shows an alternative perspective view of the chamber of Figure 1; Figure 3 shows an exploded view of the chamber of Figure 1; Figure 4 shows the chamber of Figure 1 further comprising at least one fluid source; Figure 5 shows a section view of the chamber of Figure 4 further comprising at least one helical vane; Figure 6 shows an alternative section view of the chamber of Figure 4 comprising at least one helical vane; Figure 7 shows a perspective view of an alternative example embodiment; Figure 8 shows a further perspective view of the alternative example embodiment of Figure 7; Figure 9 shows a perspective view of a chamber according to a further alternative
example embodiment;
Figure 10 shows a further perspective view of the chamber of Figure 9; and Figure 11 shows a top view of the chamber of Figure 9. Specific description Figure 1 illustrates a chamber 100 for a fluid sterilisation unit according to the present disclosure. The chamber 100 comprises an ultraviolet light source disposed within the chamber 100. The chamber 100 is elongate. The chamber 100 has an inner wall with a substantially circular cross-section. The chamber 100 further comprises two fluid inlets 102a, 102b and two fluid outlets. The fluid inlets 102a, 102b are configured to receive fluid, in this example air. The fluid outlets are configured to exhaust and/or discharge the air to atmosphere.
As shown, in Figure 1, the two fluid inlets 102a, 102b are disposed at a first longitudinal end of the chamber 100. Each of the two fluid inlets 102a, 102b are substantially tangential to the inner wall of the chamber 100. In this way, the inlets 102a, 102b are configured to direct the air flow into the chamber 100 in a manner which promotes a centrifugal, swirling, flow. Further, the two fluid inlets 102a, 102b are substantially equally spaced about a longitudinal axis of the chamber 100 such that the two fluid inlets 102a, 102b are diametrically opposed. The two fluid inlets 102a, 102b each project or protrude outwardly from chamber 100.
Figure 2 illustrates the two fluid outlets 104a, 104b. The two fluid outlets 104a, 104b are disposed at a second longitudinal end of the chamber 100. In other words, the two fluid outlets 104a, 104b are disposed at opposing longitudinal ends of the chamber 100 to the two fluid inlets 102a, 102b. Each of the two fluid outlets 104a, 104b are substantially tangential to the inner wall of the chamber 100. In this way, the outlets 104a, 104b are configured to direct the air flow out of the chamber 100 in a manner which promotes a centrifugal, swirling, flow. Further, the two fluid outlets 104a, 104b are substantially equally spaced about a longitudinal axis of the chamber 100 such that the two fluid outlets 104a, 104b are diametrically opposed.
The two fluid inlets 102a, 102b and the two fluid outlets 104a, 104b being provided substantially tangential to the inner wall of the chamber 100 provides a fluid flow within the chamber 100 that is substantially centrifugal about the longitudinal axis of the chamber 100.
Further, the fluid inlets 102a, 102b and outlets 104a, 104b are configured to maximise the exposure time (dwell time) of the fluid about the ultraviolet light source 202 and maximise the dwell time of the fluid within the chamber 100 for a given fluid flow rate.
Although the specific embodiment shown in Figures 1 to 2 illustrates two fluid inlets 102a, 102b and two fluid outlets 104a, 104b, in alternative embodiments, there may be one fluid inlet and/or fluid outlet or there may be four fluid inlets and/or fluid outlets for example.
Further, the number of fluid inlets and the number of fluid outlets may differ. For example, the chamber 100 may comprise two fluid inlets and four fluid outlets.
As shown in Figures 1 and 2, each inlet 102a, 102b and/or outlet 104a, 104b is of a substantially rectangular cross-sectional shape; this can be seen in further detail in Figure 5, described below.
The chamber 100 comprises a plurality of mounting plates which enables the chamber 100 to be mounted within a housing. The chamber 100 comprises a first end plate 204 that is disposed at the first longitudinal end of the chamber 100 and a second end plate 206 that is disposed at the second longitudinal end of the chamber 100. The chamber 100 further comprises a bottom plate 208 that passes underneath the chamber 100 and adjoins the first end plate 204 and the second end plate 206. The first end plate 204, the second end plate 206 and the bottom plate 208 may be one part or three separate plates coupled together. The first plate 204 and the second plate 206 comprise a through hole 302 that conforms and aligns with the circular cross-section of the chamber 100. The first plate 204 and the second plate 206 are integral to the cylindrical chamber body 210.
The fluid inlets 102a, 102b are incorporated into the first end plate 204. Although as will be appreciated, the fluid inlets need not be provided in this manner, but may be integrally formed with the chamber body 210. As shown in Figure 3, the fluid outlets 104a, 104b are incorporated into an outlet plate 304. The outlet plate 304 conforms to the second end plate 206. Although as will be appreciated, the fluid outlets 104a, 104b need not be provided in this manner, but may be integrally formed with the send end plate 206, or with the chamber body 210. The outlet plate 304 comprises a through hole 306 for receiving the ultraviolet light source 202. The outlet plate 304 is mounted to the second end plate 206 such that the outlet plate 304 and the second end plate 206 align. Further, the outlet plate 304 is mounted to the second end plate 206 such that each of the fluid outlets 104a, 104b align with the opening in the chamber and the through hole of the second end plate 302.
In this specific embodiment, the outlet plate 304 is mounted to the second end plate via screws. However, alternative fixing methods will be appreciated by the skilled person. Figure 4 illustrates the two fluid inlets 102a, 102b each being coupled to a fluid source 402a, 402b. In the specific embodiment of Figure 4, the fluid source is a blower fan. Each of the two inlets 102a, 102b is coupled respectively to a blower fan 402a, 402b. Each blower fan 402a, 402b is mounted/coupled to the first longitudinal end of the chamber 100, in particular to the first end plate 204. This advantageously provides a chamber 100 comprising a fluid source that is space effective. The blower fan 402a, 402b is configured to provide and accelerate fluid flow through the fluid inlets 102a, 102b and into the chamber 100. The blower fan 402a, 402b and the configuration of the fluid inlets 102a, 102b ensure that the flow within the chamber 100 is substantially centrifugal about a longitudinal axis of the chamber 100.
As shown in Figure 5, which is a sectioned view of the chamber 100, the chamber 100 comprises a plurality of helical vanes 502. The plurality of helical vanes 502 extend from the first longitudinal end of the chamber 100 to the second longitudinal end of the chamber 100. The helical vanes 502 are longitudinally spaced apart. At least a first portion of an outer edge of each of the helical vanes 502 is connected to the inner wall 504 of the chamber 100 to fix the or each of the helical vanes 502 within the chamber 100. The helical vanes 502 are configured to control the flow of fluid to increase the exposure time (dwell time) about the ultraviolet light source 202. Further, the helical vanes 502 are configured to control a swirl flow of the fluid from the or each at least one fluid inlet 102a, 102b to the or each at least one fluid outlet 104a, 104b.
The plurality of helical vanes 502 surround the ultraviolet light source 202. As shown in Figure 5, the ultraviolet light source 202 is disposed centrally within the chamber 100, extending along a longitudinal axis thereof. The ultraviolet light source 202 extends from the first longitudinal end of the chamber 100 to the second longitudinal end of the chamber 100.
As described above, the inlets 102a, 102b are outlets 104a, 104b have a substantially rectangular cross-sectional shape. As can be seen in Figure 5, the helical vanes 502 are arranged such that the cross-sectional shape of the inlets 102a, 102b and outlets 104a, 104b is formed at least partially by the helical vanes 502. As such, in this example, the chamber 100 comprises two helical vanes, one for each inlet / outlet pair. As shown more clearly in Figure 6, the plurality of helical vanes 502 are shaped to conform to the ultraviolet light source 202. In particular, each of the helical vanes 502 comprises a cutaway, recess, or indentation 602 configured to conform to the ultraviolet light source 202. Further, the plurality of helical vanes 502 are shaped to conform to the ultraviolet light source 202 such that when the ultraviolet light source 202 is disposed centrally within the chamber 100 there is a gap between the helical vane 502 and the ultraviolet light source 202. This gap is preferably within the region of about 0.5 mm to about mm. This is advantageous as it means the ultraviolet light source 202 can be inserted into the chamber 100 along the longitudinal axis of the chamber 100 without making contact with the helical vanes 502. Therefore, this reduces the risk of damaging the helical vanes 502 and/or the ultraviolet light source 202.
The ultraviolet light source of this specific embodiment is an ultraviolet lamp 202.
The ultraviolet lamp 202 preferably produces UV-C light. This is advantageous as UV-C light acts as a disinfectant and is effective at irradiating fluid. Further, the ultraviolet light source 202 may disposed within a transparent casing or sleeve.
Figures 7 and 8 represent an alternative chamber 200 according to the present disclosure. In particular, Figures 7 and 8 represent the chamber 100 of Figures 1 to 6 with an alternative fluid outlet arrangement. The chamber comprises an ultraviolet light source 700. The chamber 200 comprises a first fluid outlet 702a and a second fluid outlet 702b disposed towards the second longitudinal end of the chamber 200. The first fluid outlet 702a and the second fluid outlet 702b protrude from the chamber 200. The first fluid outlet 702a and the second fluid outlet 802b comprise a first portion 704a, 704b respectively which is substantially tangential to the inner wall of the chamber 200. The first portion 704a, 704b has a substantially rectangular cross-section. The chamber 200 of Figures 7 and 8 has a circular cross-section. As shown more clearly in Figure 8, the first fluid outlet 702a and the second fluid outlet 702b also comprise a second portion 706a, 706b that protrudes from the respective first portion 704a, 704b and is perpendicular to the longitudinal axis of the chamber 200. The second portion 706a, 706b of the first fluid outlet and the second fluid outlet is substantially cylindrical, however, other shapes will be appreciated by the skilled person. This arrangement advantageously provides a fluid flow within the chamber 200 that is substantially centrifugal about the longitudinal axis of the chamber 200. As shown in Figures 7 and 8, the fluid inlets of chamber 200 conform to the chamber 100 depicted in Figures 1 to 6.
Figures 9 to 11 represent an alternative chamber 300 according to the present disclosure. The chamber 300 comprises an ultraviolet light source 202 disposed within the chamber 300. The chamber 300 has an inner wall with a substantially circular cross-section. As shown in Figure 9, the chamber 300 further comprises two fluid inlets 902a, 902b.
The first fluid inlet 902a is disposed at or towards the first longitudinal end of the chamber 300. The second fluid inlet 902b is disposed at or towards the second longitudinal end of the chamber 300. The first fluid inlet 902a and the second fluid inlet 902b are substantially tangential to the inner wall of the chamber 300. The first fluid inlet 902a and the second fluid inlet 902b both protrude or project outwardly from the chamber 300. In particular, the first fluid inlet 902a and the second fluid inlet 902b protrude from the chamber 300 in the direction of the fluid flow. The first fluid inlet 902a and the second fluid inlet 902b have a substantially rectangular cross-section, however, other suitable cross-sectional shapes will be appreciated by the skilled person. A first portion of an inner wall of the first fluid inlet 902a and a first portion of an inner wall of the second fluid inlet 902b substantially aligns with the inner wall of the chamber 300. Further, a second portion of inner wall of the first fluid inlet 902a substantially aligns with the first longitudinal end wall 904 of the chamber 300. A second portion of the inner wall of the second fluid inlet 902b substantially aligns with the second longitudinal end wall of the chamber 300.
Although not shown, the first fluid inlet 902a and the second fluid inlet 902b are each coupled to a fluid source, for example, a fan.
Each fluid inlet 902a, 902b comprises a first fluid inlet opening 906a, 906b for receiving a fluid and a second fluid inlet opening for discharging or releasing a fluid into the chamber 300. In other words, the first fluid inlet opening 906a, 906b is an opening coupled to the fluid source through which the fluid enters the inlet conduit. The second fluid inlet opening is an opening through which the fluid leaves the fluid inlet 902a, 902b and enters the chamber 300. The second fluid opening of the fluid inlet aligns with an opening in the chamber 300.
Figure 10 clearly illustrates the chamber further comprising one fluid outlet 908. The fluid outlet 708 is disposed between the first longitudinal end 904 of the chamber 300 and the second longitudinal end 910 of the chamber 300. The fluid outlet 908 is disposed on the opposing side of the chamber to the first fluid inlet 902a and the second fluid inlet 902b. The fluid outlet 908 is equidistant from the first fluid inlet 902a and the second fluid inlet 902b. The fluid outlet 908 protrudes or projects from the chamber 300. The fluid outlet 908 is substantially tangential to the inner wall of the chamber 300. Further, the fluid outlet 908 has a substantially rectangular cross-section, however, other suitable cross-sectional shapes will be appreciated by the skilled person. The fluid outlet 908 is configured to exhaust or discharge to atmosphere. The fluid outlet 908 comprises a first fluid outlet opening for receiving a fluid into the fluid outlet 908 from the chamber 300 and a second fluid outlet 912 opening for discharging or dispersing the irradiated fluid to atmosphere. In other words, the first fluid outlet opening is an opening for receiving the irradiated fluid from the chamber 300 into the fluid outlet 908. The first fluid outlet opening aligns with an opening in the chamber 300. The second fluid inlet opening 912 is an opening through which the fluid leaves the fluid outlet 908 and exits the chamber 300.
As illustrated in Figure 11, the cross-sectional area of the fluid outlet 908 is greater than the cross-sectional area of the first fluid inlet 902a and the second fluid inlet 902b. In particular, the cross-sectional area of the fluid outlet 908 is generally two times greater than the cross-sectional area of the first fluid inlet 902a and/or the second fluid inlet 902b.
Although not shown in the Figures, the chamber may further comprise a diffuser coupled to the fluid outlet 908. The diffuser increases in cross-sectional area as it extends away from the fluid outlet 908. The chamber 300 further comprising a diffuser coupled to the fluid outlet 908 advantageously controls the fluid flow and provides a more uniform flow.
The chamber 300 according to Figures 9 to 11 is a closed chamber apart from a through hole located at the second longitudinal end of the chamber for receiving the ultraviolet light source 202. In use, when the ultraviolet light source 202 is disposed within the chamber, the chamber is a closed cylindrical chamber.
Further, the chamber 300 of Figures 9 to 11 may also comprise at least one helical vane as described above with regards to the chamber represented by Figures 1 to 6.
Although not illustrated by the Figures, there is also provided a fluid sterilisation unit. The fluid sterilisation unit comprises a chamber as substantially described herein. The fluid sterilisation unit further comprises a fluid source in fluid communication with the or each at least one inlet, an ultraviolet light source driver and a housing configured to house the chamber, the fluid source and the ultraviolet light source driver.
The fluid sterilisation unit may comprise the chamber 100 depicted in Figures 1 to 6. Alternatively, the fluid sterilisation unit may comprise the chamber 200 depicted in Figures 7 and 8. Further alternatively, the fluid sterilisation unit may comprise the chamber 300 depicted in Figures 9 to 11. The fluid source is a blower fan that is configured to provide fluid through the at least one inlet to which it is coupled. The ultraviolet light source driver is configured to power the ultraviolet light source. The ultraviolet light source is an ultraviolet lamp emitting ultraviolet-C light.
In use, the fluid to be irradiated or sterilised is provided by the fluid source through the fluid inlets and into the chamber. Once inside the chamber the fluid flows longitudinally.
The at least one helical vane disposed about the ultraviolet light source controls a swirl flow of the fluid from the inlets the at least one outlet. The at least one inlet and the at least one outlet are substantially tangential to the inner wall of the chamber to promote such swirling flow. The swirl flow increases the dwell time of the fluid, in this case air, for any given fluid flow rate as compared to the known sterilisation systems while reducing the pressure drop from the inlets to the outlets.
Described above are a number of embodiments with various optional features. It should be appreciated that, with the exception of any mutually exclusive features, any combination of one or more of the optional features are possible.

Claims (22)

  1. Claims 1. 2. 3. 4. 5. 6. 7. 8. 9.A chamber, for use in a fluid sterilisation unit, comprising: an ultraviolet light source disposed within the chamber; at least one fluid inlet; and at least one fluid outlet, the chamber having an inner wall with a substantially circular cross-section, wherein the at least one fluid inlet and the at least one fluid outlet are substantially tangential to the inner wall of the chamber.
  2. A chamber according to claim 1 wherein the at least one fluid inlet is disposed at a first longitudinal end of the chamber.
  3. A chamber according to claim 1 or 2, wherein the chamber comprises at least two fluid inlets.
  4. A chamber according to claim 3, wherein a first one of the at least two fluid inlets is disposed at a first longitudinal end of the chamber, and a second one of the at least two fluid inlets is disposed at a second longitudinal end of the chamber.
  5. A chamber according to any preceding claim, wherein the at least one fluid outlet is disposed between a first longitudinal end of the chamber and a second longitudinal end of the chamber.
  6. A chamber according to claim 3, wherein each of the at least two fluid inlets is disposed at the first longitudinal end of the chamber.
  7. A chamber according to claim 6, wherein the at least two fluid inlets are substantially equally spaced about a longitudinal axis of the chamber.
  8. A chamber according to any preceding claim, wherein the chamber comprises at least two fluid outlets.
  9. A chamber according to claim 8, wherein each of the at least two fluid outlets is disposed at the second longitudinal end of the chamber.
  10. 10. A chamber according to claim 9, wherein the at least two fluid outlets are substantially equally spaced about a longitudinal axis of the chamber.
  11. 11. A chamber according to any preceding claim, wherein the or each at least one fluid inlet protrudes from the chamber.
  12. 12. A chamber according to claim 11, wherein at least a first portion of an inner wall of the or each at least one fluid inlet substantially aligns with the inner wall of the chamber.
  13. 13. A chamber according to claim 12, wherein at least a second portion of an inner wall of the or each at least one fluid inlet substantially aligns with an end wall of the chamber.
  14. 14. A chamber according to any preceding claim, wherein the or each at least one fluid inlet and/or the or each at least one fluid outlet has a substantially rectangular cross-section.
  15. 15. A chamber according to any preceding claim, wherein the or each at least one fluid outlet is configured to exhaust to atmosphere.
  16. 16. A chamber according to any preceding claim, further comprising at least one diffuser coupled respectively to the or each at least one fluid outlet. 25
  17. 17. A chamber according to any preceding claim, wherein the ultraviolet light source is disposed centrally within the chamber, extending along a longitudinal axis thereof.
  18. 18. A chamber according to any preceding claim, wherein the or each at least one fluid inlet is coupled to a fluid source.
  19. 19. A chamber according to any preceding claim, wherein the chamber comprises at least one helical vane disposed about the ultraviolet light source and configured to control a swirl flow of the fluid from the or each at least one fluid inlet to the or each at least one fluid outlet.
  20. 20. A chamber according to claim 19, wherein the at least one helical vane extends from the first longitudinal end of the chamber to the second longitudinal end of the chamber.
  21. 21. A fluid sterilisation unit comprising: a chamber according to any of the preceding claims; a fluid source in fluid communication with the or each at least fluid one inlet; an ultraviolet light source driver; and a housing configured to house the chamber, the fluid source and the ultraviolet light source driver.
  22. 22. Use of the chamber as claimed in any of claims 1 to 20, for sterilising a fluid using a ultraviolet light.
GB2303576.9A 2023-03-10 2023-03-10 A chamber for use in a fluid sterilisation unit Pending GB2628097A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2303576.9A GB2628097A (en) 2023-03-10 2023-03-10 A chamber for use in a fluid sterilisation unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2303576.9A GB2628097A (en) 2023-03-10 2023-03-10 A chamber for use in a fluid sterilisation unit

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GB2628097A true GB2628097A (en) 2024-09-18

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080019861A1 (en) * 2003-10-27 2008-01-24 Silderhuis Hermannus Gerhardus Air Treatment Method and Device
JP2011183126A (en) * 2010-03-06 2011-09-22 Shield Tec Kk Air sterilizing device
KR102197534B1 (en) * 2020-07-15 2021-01-04 (주)블루테크 A space sterilizer having a laminar flow air-discharging function
WO2021237172A1 (en) * 2020-05-21 2021-11-25 Obermeyer Henry K Ultraviolet air sterilizer
GB2598617A (en) * 2020-09-04 2022-03-09 Cpi Acoustical Ltd An air sterilisation device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080019861A1 (en) * 2003-10-27 2008-01-24 Silderhuis Hermannus Gerhardus Air Treatment Method and Device
JP2011183126A (en) * 2010-03-06 2011-09-22 Shield Tec Kk Air sterilizing device
WO2021237172A1 (en) * 2020-05-21 2021-11-25 Obermeyer Henry K Ultraviolet air sterilizer
KR102197534B1 (en) * 2020-07-15 2021-01-04 (주)블루테크 A space sterilizer having a laminar flow air-discharging function
GB2598617A (en) * 2020-09-04 2022-03-09 Cpi Acoustical Ltd An air sterilisation device

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