An ultraviolet optical cavity reaction chamber module for an air handling unit

Abstract

This invention belongs to the field of reaction chamber technology, specifically relating to an ultraviolet optical cavity reaction chamber module for an air treatment device. The cavity body defines an internal chamber and has an inlet opening and an outlet opening, which are arranged in series with an external airflow passage. One or more internal surfaces of the cavity body are reflective surfaces, the shape of which causes the internal geometry of the cavity body to form an optical cavity. This invention allows light emitted from a region inside the cavity to be repeatedly reflected on an elliptical surface, and to be reflected multiple times within the cavity before reaching the inlet or outlet opening. Simultaneously, the geometric discontinuities at the internal seams minimize the impact on overall optical performance. This invention reduces direct exposure to ultraviolet radiation from the outside of the module and converts intercepted photons into an additional air purification mechanism. Furthermore, the photocatalytic layer does not significantly reduce the reflectivity of the main optical cavity walls.

Description

Technical Field

[0001] This invention belongs to the field of reaction chamber technology, specifically relating to an ultraviolet optical cavity reaction chamber module for an air treatment device. Background Technology

[0002] Ultraviolet (UVGI) sterilization is a widely used air purification technology that uses specific wavelengths of ultraviolet light (typically in the UVC band between 200 and 280 nanometers) to irradiate airborne microorganisms (such as bacteria, viruses, and fungal spores), destroying their DNA or RNA structure, thereby inactivating pathogens and purifying the air. This technology is commonly found in indoor air purifiers, heating, ventilation, and air conditioning (HVAC) systems, and dedicated air handling equipment.

[0003] In most commercially available air handling systems, the ultraviolet (UV) sterilization module is typically designed as a simple rectangular metal duct or enclosure. In this configuration, one or more UVC lamps are installed directly inside the duct, downstream of the fan and air filters (such as HEPA or activated carbon filters). As air flows through this duct, it is briefly exposed to UV light, thus inactivating microorganisms.

[0004] However, this traditional rectangular air duct design has several obvious limitations:

[0005] Low optical efficiency: Traditional air ducts are typically made of stainless steel or sprayed thin metal sheets, which generally have low reflectivity in the UVC band (e.g., only moderate reflectivity, about 0.6 to 0.8). Therefore, the light emitted by the UV lamps undergoes only a few reflections on the inner wall of the air duct before its energy is significantly attenuated, making it difficult to fully utilize. This not only reduces sterilization efficiency but also wastes light energy.

[0006] Uneven light distribution: The ultraviolet field distribution within the rectangular air duct is extremely uneven. Areas near the lamps have higher light intensity, while the duct walls, corners, and areas far from the lamps have lower intensity. This uneven irradiation results in some air not receiving a sufficient dose of ultraviolet light, thus affecting the overall sterilization effect.

[0007] Dust and pollutant accumulation: In actual use, dust, particles, and other pollutants carried in the air will gradually accumulate on the surface of the lamp tube and the inner wall of the air duct. These deposits not only block and absorb ultraviolet rays, but also further reduce the reflectivity of the inner wall, causing the system's sterilization performance to decline significantly over time.

[0008] Limitations of the improvement plan: Increasing lamp power or number of lamps: Although it can increase the UV dose, it will increase energy consumption, heat dissipation burden and equipment cost, especially in consumer air purifiers with limited space.

[0009] Install baffles or louvers: Some systems install baffles at the air outlet to reduce direct leakage of ultraviolet rays. However, these baffles often absorb the trapped light, converting valuable ultraviolet energy into useless heat energy instead of using it for sterilization, resulting in a waste of light power.

[0010] Therefore, the current market urgently needs a more efficient, compact, and durable ultraviolet sterilization module. This module should have a specially designed geometry that effectively confines ultraviolet light within the cavity, extending the light path through multiple reflections and improving light utilization efficiency. Simultaneously, its inner walls should be easy to clean and maintain, maintaining high reflectivity over long periods in dusty environments. Furthermore, the module should be modular to allow for flexible integration into different types of air handling equipment, meeting diverse application needs. Summary of the Invention

[0011] To address the shortcomings of existing technologies, this invention provides a cavity-enhanced reaction cavity structure. This invention allows light emitted from a region within the cavity to be repeatedly reflected on an elliptical surface, and to undergo multiple reflections within the cavity before reaching the inlet or outlet opening, thus forming a multi-elliptical optical cavity. Simultaneously, the geometric discontinuities at the internal seams minimize the impact on overall optical performance. This invention serves two purposes: firstly, as a safety element, it reduces direct exposure to ultraviolet radiation from the module's exterior; secondly, it converts intercepted photons into an additional air purification mechanism, rather than simply converting light energy into heat. Furthermore, the photocatalytic layer is confined to the baffle surface near the opening, thus not significantly reducing the reflectivity of the main optical cavity walls; this invention significantly increases the effective optical path.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] An ultraviolet optical cavity reaction chamber module for an air handling device, comprising:

[0014] A cavity body defining an internal chamber and having an inlet opening and an outlet opening, the inlet opening and the outlet opening being arranged in series with an external airflow passage;

[0015] One or more internal surfaces of the cavity body are reflective surfaces, and their shapes cause the internal geometry of the cavity body to form an optical cavity.

[0016] The optical cavity is configured to allow air to flow between the inlet opening and the outlet opening while confining ultraviolet radiation within the internal cavity.

[0017] At least one section of the wall of the internal cavity containing the flow direction through the internal cavity has an elliptical profile.

[0018] Furthermore, the multiple walls of the internal cavity have elliptical profiles to form a multi-elliptical optical cavity, and the vertical cross-section of the internal cavity in the flow direction is rectangular or square.

[0019] Furthermore, it also includes at least one ultraviolet lamp arranged in the internal chamber, the ultraviolet lamp being configured to emit ultraviolet radiation into the optical cavity to irradiate the air flowing between the inlet opening and the outlet opening.

[0020] Furthermore, the at least one ultraviolet lamp includes a tubular lamp that extends along the flow direction and is located between the inlet opening and the outlet opening;

[0021] The stimulated light length of the tubular lamp is shorter than the longitudinal length of the internal chamber, such that the longitudinal ends of the tubular lamp are located inside the inlet opening and the outlet opening;

[0022] It also includes a support structure for fixing the tubular lamp in the internal cavity, the support structure being a cross-shaped frame arranged in the plane of the inlet opening and / or the outlet opening.

[0023] Furthermore, at least one ultraviolet lamp is a directional emitter, the directional emitter comprising a linear UVC-LED array mounted on a planar wall of the cavity body;

[0024] The linear UVC-LED array is configured to emit ultraviolet radiation toward a wall with an elliptical profile;

[0025] The elliptical wall is arranged on the opposite side of the planar wall, such that light emitted from the array toward the elliptical wall is reflected multiple times between the elliptical wall and the opposite wall of the internal chamber.

[0026] Furthermore, the reflective internal surface includes a reflective plate;

[0027] The reflective internal surface includes an ultraviolet transmission protective coating, which includes a silicon dioxide-based coating.

[0028] Furthermore, it also includes at least one baffle disposed at the inlet opening and / or the outlet opening;

[0029] The baffle is configured to block the line-of-sight path of ultraviolet radiation from the internal chamber to the outside of the module while allowing airflow.

[0030] The baffle has a surface coated with a photocatalytic material, including titanium dioxide, and is configured to drive the oxidative decomposition of airborne pollutants using ultraviolet radiation intercepted therefrom.

[0031] Furthermore, the inlet opening and the outlet opening each have a rectangular or square cross-section.

[0032] Furthermore, the module is configured to be installed downstream of one or more particulate and vapor phase filters in the air handling unit to reduce the dust load on the reflective internal surface; the module is also configured to be installed upstream of the fan module in the air handling unit.

[0033] Furthermore, multiple modules can be connected in series and / or in parallel within the same housing to form a multi-stage UVC enhancement cavity for handling high airflow rates.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) The shape and orientation of the elliptical wall surface of the present invention are designed such that light emitted from a certain area inside the cavity is repeatedly reflected on the elliptical surface and can be reflected multiple times inside the cavity before reaching the entrance or exit opening, thereby forming a multi-elliptical optical cavity; and the cavity body can be formed by connecting multiple metal plates along longitudinal seams. At least one of the metal plates needs to be bent or shaped to obtain the desired elliptical profile, while the other metal plates can be shaped into additional elliptical or planar profiles according to design preferences. The plates can be connected by bending, snapping, riveting, spot welding or other mechanical fastening methods, so that the structure can be made of thin metal plates without complex mold forming; at the same time, the internal seams are preferably arranged in areas with relatively low simulated or measured irradiance, so as to minimize the impact of geometric discontinuities at the seams on the overall optical performance.

[0036] (2) The baffle structure of the present invention is configured to interrupt the straight line-of-sight path from the inside of the cavity to the external environment, while allowing air to pass through under acceptable pressure drop conditions. Simultaneously, when the radiation emitted by the ultraviolet lamp is intercepted by the baffle, the absorbed light drives a photocatalytic reaction on its surface, generating active species that oxidize and decompose volatile organic compounds and other pollutants in the passing air. On the one hand, it serves as a safety element, reducing direct exposure to ultraviolet radiation outside the module; on the other hand, it converts the intercepted photons into an additional air purification mechanism, rather than simply converting light energy into heat. Furthermore, the photocatalytic layer is confined to the baffle surface near the opening, thus not significantly reducing the reflectivity of the main optical cavity wall.

[0037] (3) In this invention, the elliptical wall is arranged on the opposite side of the planar wall that carries the light source. The elliptical wall is oriented such that its focal area is located near the light-emitting area of ​​the light source. The light emitted toward the elliptical wall is reflected back into the internal cavity and reflects multiple times between the elliptical wall and the opposite planar wall, which can significantly increase the effective optical path compared to a pure rectangular duct that is illuminated from only one side. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a multi-elliptical optical cavity in an ultraviolet optical cavity reaction chamber module for an air treatment device according to the present invention.

[0039] Figure 2 This is a schematic diagram of the geometric structure and coordinate system of the ultraviolet reaction chamber of an ultraviolet optical cavity reaction chamber module for an air treatment device according to the present invention;

[0040] Figure 3 This is a schematic diagram comparing the ray tracing structures of a conventional rectangular cavity (left) and a multi-elliptical reaction cavity (right) for an ultraviolet optical cavity reaction chamber module of an air treatment device according to the present invention.

[0041] Figure 4 This is a schematic diagram of the spatial irradiance distribution under different wall reflectivities of an ultraviolet optical cavity reaction chamber module for an air handling device according to the present invention;

[0042] Figure 5 This is a schematic diagram of the normalized optical gain of an elliptical cavity and a rectangular cavity under different wall reflectivities in an ultraviolet optical cavity reaction chamber module for an air treatment device according to the present invention.

[0043] Figure 6 This is a schematic diagram of the integration of the ultraviolet optical cavity module of the ultraviolet optical cavity reaction chamber module for an air treatment device into an air purification system.

[0044] The attached figures are labeled as follows:

[0045] Cavity body - 100; Inlet opening - 110; Outlet opening - 120; Baffle - 130; Ultraviolet lamp - 200; Fan module - 300. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0047] Although the steps in this invention are arranged by reference numerals, this is not intended to limit the order of the steps. Unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0048] Example

[0049] Overall module structure:

[0050] In the illustrated embodiment, as Figure 1 As shown, the reaction chamber module includes a cavity body 100 defining an internal chamber extending along a longitudinal axis corresponding to the airflow direction. The cavity body 100 has an inlet opening 110 at one longitudinal end and an outlet opening 120 at the opposite longitudinal end, each opening configured for series connection with an external air handling unit (e.g., a fan housing or duct). In a typical implementation, the inlet and outlet openings have a generally square cross-section, allowing the module to be inserted into a rectangular airflow channel in an air purifier or HVAC system. The cavity body 100 is mechanically self-supporting and can be mounted within an external housing via brackets or flanges located at its longitudinal ends.

[0051] Hybrid quadric surface-planar cavity geometry:

[0052] The internal cavity is surrounded by a set of reflective internal surfaces, which together constitute a hybrid quadric surface-planar optical cavity. In a cross-section perpendicular to the longitudinal axis, the cavity can be substantially rectangular or square; however, in a plane containing the longitudinal axis, at least one wall segment has an elliptical profile, maintaining this profile along the length of the cavity. In a convenient configuration, four wall segments with elliptical profiles are arranged sequentially along the circumference of the internal cavity, making the cross-section of the cavity body 100 substantially rectangular or square, its boundaries defined by these elliptical walls and optional additional planar walls. The shape and orientation of the elliptical walls are designed such that light emitted from a region within the cavity is repeatedly reflected on the elliptical surfaces and can be reflected multiple times within the cavity before reaching the entrance or exit opening, thus forming a multi-elliptical optical cavity.

[0053] In this specification, "a wall with an elliptical profile" means that the cross-sectional curve of the wall, which includes the flow direction and intersects the wall, substantially follows an elliptical shape, including curves that can approximate an ideal ellipse within manufacturing tolerances.

[0054] The cavity body 100 can be formed by connecting multiple metal plates along longitudinal seams. At least one metal plate needs to be bent or shaped to obtain the desired elliptical profile, while other metal plates can be shaped into additional elliptical or planar profiles according to design preferences. The plates can be connected by bending snaps, riveting, spot welding, or other mechanical fastening methods, allowing the structure to be made from thin metal plates without the need for complex mold forming. The internal seams are preferably located in areas with relatively low simulated or measured irradiance, so as to minimize the impact of geometric discontinuities at the seams on the overall optical performance. For some applications, the cavity body 100 can also be prepared by various molding processes, including but not limited to injection molding, blow molding, and compression molding.

[0055] UV lamp and supporting structure:

[0056] At least one ultraviolet lamp 200 may be arranged in the internal chamber and configured to emit ultraviolet radiation into the optical cavity. In the primary embodiment, a tubular UVC lamp extends approximately along the longitudinal axis, located between the inlet and outlet openings. The effective stimulated light length of the tubular lamp is set to be shorter than the longitudinal length of the internal chamber, such that each longitudinal end of the lamp tube is recessed relative to the corresponding opening, thereby reducing direct leakage of ultraviolet radiation, such as... Figure 2 As shown in the diagram, the longitudinal position of the lamp can be selected, for example, near the center of the cavity, to optimize the irradiance distribution for a given emission distribution.

[0057] In some implementations, the lamp is secured within an internal chamber by a support structure designed to minimize obstruction to airflow and light propagation. One example support structure includes a cross-shaped frame positioned within the plane of either the inlet or outlet opening. This cross-shaped frame comprises pairs of orthogonal support arms spanning opposite sides of the opening, with a lamp holder positioned at the central node where they intersect. By primarily arranging the support structure within the opening plane and limiting the cross-sectional area of ​​the support arms, the interception and absorption of light radiation by the support structure can be significantly reduced compared to conventional internal supports.

[0058] Reflective surface and UV transmission protective coating:

[0059] The inner surface of the cavity body 100 is made into a reflective surface to generate an optical cavity effect. In one implementation, the cavity body 100 is made of aluminum or other metals with high fundamental reflectivity in the UVC band, and the inner surface is polished or otherwise treated to acquire specular reflective properties. Experimental characterization of representative materials shows that, in the UVC band, the reflectivity of a specular metal surface can exceed about 0.8, significantly extending the effective optical path compared to diffuse or low-reflectivity surfaces.

[0060] To maintain high reflectivity throughout the module's lifespan, the reflective internal surface can be coated with a UV-transmitting protective coating made from materials with low absorption in the bactericidal band. Suitable coatings include silica-based materials (such as SiO2), as well as other oxides or glasses with low extinction coefficients (k) in the UVC range. This type of coating forms a smooth, hard layer, reducing dust particle adhesion and allowing for cleaning by wiping or blowing without significant abrasion to the underlying metal, while introducing only minor additional UVC attenuation. At a specific design wavelength, even higher reflectivity can be achieved when the optical thickness of the coating is approximately one-quarter of that wavelength.

[0061] Baffle 130 and photocatalytic coating:

[0062] To further reduce ultraviolet radiation leakage from the module and utilize light that would otherwise be lost at the opening, this embodiment may provide a baffle structure at the outlet opening 120, and optionally also at the inlet opening 110, such as... Figure 6 As shown, the baffle 130 structure is configured to disrupt the straight line-of-sight path from the interior of the cavity to the external environment while allowing air to pass through under acceptable pressure drop conditions. For example, the baffle 130 may consist of one or more plates or fins that span a portion of the outlet opening and are staggered relative to each other to form a tortuous flow path.

[0063] The surface of the baffle 130 facing the interior of the cavity can be coated with a photocatalytic material, such as titanium dioxide or other similar photocatalysts. When the radiation emitted by the ultraviolet lamp is intercepted by the baffle, the absorbed light drives a photocatalytic reaction on its surface, generating active species that oxidize and decompose volatile organic compounds and other pollutants in the passing air. In this way, the baffle 130 has a dual function: firstly, as a safety element, reducing direct exposure to ultraviolet radiation from outside the module; secondly, converting the intercepted photons into an additional air purification mechanism, rather than simply converting light energy into heat. Because the photocatalytic layer is confined to the surface of the baffle 130 near the opening, it does not significantly reduce the reflectivity of the main optical cavity wall.

[0064] Ray tracing and irradiance analysis:

[0065] Ray tracing simulations were performed for both multi-elliptical optical cavities and comparable-sized traditional rectangular cavities. For example... Figure 3 As shown, under ideal specular reflection and optimized lamp emission angle conditions, light emitted from a rectangular cavity (left figure) will rapidly escape from the opening as the optical path length (OPL) increases, while light in a multi-elliptical cavity (right figure) can still be reflected multiple times within the cavity even when OPL=1000cm, demonstrating the optical constraint characteristics of the proposed geometric structure.

[0066] To quantitatively assess the obtained dose distribution, a representative inclined plane was selected within each cavity, and the spatial irradiance distribution was calculated, such as... Figure 4 As shown, for reflectivities R=0.8 and R=0.99, the multi-elliptical cavity exhibits higher average irradiance and more uniform spatial distribution compared to the rectangular cavity, while the effective optical path of the rectangular cavity does not change much with increasing reflectivity. Figure 5 The relationship between the volume-average normalized intensity and wall reflectivity for the two geometries was summarized, with the rectangular cavity with R=0 as the normalization benchmark. At R=0.99, the enhancement factor of the multi-elliptical cavity was approximately 50.2 times, while that of the rectangular cavity was only approximately 2.1 times, thus confirming the advantage of this design in photon recycling capability.

[0067] Airflow path, integration, and maintenance:

[0068] Figure 6 This illustration shows how the reaction chamber module is integrated into an air purification system as a UVC enhancement chamber. In typical applications, this module is installed downstream of one or more particulate and gas phase filters (e.g., pre-filters, HEPA filters, and activated carbon filters) to reduce dust accumulation on the walls of the reflection chamber and its protective coating. The module can be securely connected to the outer housing or ductwork via screws, clips, or sealing gaskets around the inlet and outlet openings.

[0069] During operation, fan-driven air enters through inlet opening 110, passes through the internal chamber, and is repeatedly irradiated with ultraviolet light reflected from the elliptical reflective surface before exiting through outlet opening 120. This modular design allows multiple UVC enhancement chambers to be connected in series or parallel within a rectangular housing to meet different airflow handling capacity requirements, such as… Figure 6 As shown; if the reflectivity decreases due to dust accumulation, the reflective performance can be restored by opening the inspection port on the equipment casing and wiping the coated reflective surface with a soft cloth or blowing it with compressed air; if a tubular lamp is used, it can also be removed from the lamp holder and replaced when its UVC output decays below the set threshold.

[0070] Directional LED light source:

[0071] The reaction chamber module uses a directional ultraviolet light source and reduces the number of elliptical walls, but still retains the core feature that at least one section of the internal wall has an elliptical profile.

[0072] Cavity geometry suitable for directional launch:

[0073] The module also includes a cavity body 100 defining an internal chamber extending along the longitudinal airflow direction, with an inlet opening 110 at one end and an outlet opening 120 at the other end, both configured to be connected in series with an external duct or housing. One or more internal surfaces of the cavity body 100 are reflective surfaces, the shape of which causes the internal geometry to form an optical cavity. In this embodiment, at least one main wall of the internal chamber has an elliptical profile in a plane containing the flow direction, while one or more additional walls are substantially planar, so the overall cross-section can resemble a truncated ellipse or an ellipse-plane combination.

[0074] The elliptical wall is positioned opposite the planar wall supporting the light source. The elliptical wall is oriented such that its focal area is near the light-emitting area of ​​the light source. Light emitted towards the elliptical wall is reflected back into the internal chamber and undergoes multiple reflections between the elliptical wall and the opposite planar wall, significantly increasing the effective optical path compared to a purely rectangular duct illuminated from only one side.

[0075] Directional LED light source and installation:

[0076] In this embodiment, the ultraviolet light source is a directional emitter, such as a linear UVC-LED array mounted on a thermally conductive substrate. This LED array emits ultraviolet radiation within a defined solid angle, typically forming a fan-shaped beam directed towards an elliptical wall. The array is mounted on a support plate constituting a planar wall of the cavity body 100 and can be thermally coupled to an external heat sink or the metal housing of an air handling unit for heat dissipation.

[0077] The emitting surface of the LED array faces the interior of the cavity and is preferably recessed at a certain distance from the inlet and outlet openings so that its main emission cone does not exit directly from the module opening. The specific position and orientation of the array relative to the elliptical wall can optimize the irradiance distribution according to the selected emission angle, but this precise arrangement is not a necessary condition for defining the optical cavity.

[0078] Reflective wall surface, protective coating and baffle:

[0079] The remaining internal walls of the cavity body 100, including elliptical walls and planar walls, can be configured with mirror-reflective surfaces and ultraviolet-transmitting protective coatings similar to those in the main embodiment. At least one section of the elliptical wall is reserved for guiding light and enhancing the confinement effect, while the planar portions are primarily used to provide structural enclosure and secondary reflection. The photocatalytic baffle 130 structure, arranged at the outlet opening and optionally at the inlet opening, can be reused to intercept high-angle light that would otherwise escape, and in the same manner as in the tubular lamp embodiment, utilize the intercepted photons to perform photocatalytic oxidation and decomposition of pollutants.

[0080] application:

[0081] This directional LED embodiment is particularly suitable for compact air handling units with limited internal space, where it is difficult to arrange a central tubular light, and where precise control of the lighting pattern is desired. By combining at least one elliptical reflector wall with a planar wall carrying the LED into a hybrid quadric-planar geometry, this module can be manufactured with relatively simple thin sheet metal components, while still providing better light confinement and dose uniformity compared to traditional flat-wall LED ducts.

[0082] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A UV optical cavity reaction chamber module for an air treatment device, characterized in that, include: A cavity body (100) defines an internal chamber and has an inlet opening (110) and an outlet opening (120), the inlet opening (110) and the outlet opening (120) being arranged in series with an external airflow passage. One or more internal surfaces of the cavity body (100) are reflective surfaces, and their shape causes the internal geometry of the cavity body to form an optical cavity. The optical cavity is configured to allow air to flow between the inlet opening (110) and the outlet opening (120) while confining ultraviolet radiation within the internal cavity. At least one section of the wall of the internal cavity containing the flow direction through the internal cavity has an elliptical profile.

2. The ultraviolet optical cavity reaction chamber module according to claim 1, characterized in that, The internal chamber has multiple walls with elliptical profiles to form a multi-elliptical optical cavity, and the vertical cross-section of the internal chamber in the flow direction is rectangular or square.

3. The ultraviolet optical cavity reaction chamber module according to claim 1 or 2, characterized in that, It also includes at least one ultraviolet lamp (200) arranged in the internal chamber, the ultraviolet lamp (200) being configured to emit ultraviolet radiation into the optical cavity to irradiate the air flowing between the inlet opening and the outlet opening.

4. The ultraviolet optical cavity reaction chamber module according to claim 3, characterized in that, The at least one ultraviolet lamp (200) includes a tubular lamp that extends along the flow direction and is located between the inlet opening (110) and the outlet opening (120); The stimulated light length of the tubular lamp is shorter than the longitudinal length of the internal chamber, so that the longitudinal ends of the tubular lamp are located inside the inlet opening (110) and the outlet opening (120); It also includes a support structure for fixing the tubular lamp in the internal cavity, the support structure being a cross-shaped frame arranged in the plane of the inlet opening (110) and / or the outlet opening (120).

5. The ultraviolet optical cavity reaction chamber module according to claim 3, characterized in that, At least one ultraviolet lamp (200) is a directional emitter, the directional emitter comprising a linear UVC-LED array mounted on a planar wall of the cavity body; The linear UVC-LED array is configured to emit ultraviolet radiation toward a wall with an elliptical profile; The elliptical wall is arranged on the opposite side of the planar wall, such that light emitted from the array toward the elliptical wall is reflected multiple times between the elliptical wall and the opposite wall of the internal chamber.

6. The ultraviolet optical cavity reaction chamber module according to any one of claims 1 to 5, characterized in that, The reflective internal surface includes a reflective plate; The reflective internal surface includes an ultraviolet transmission protective coating, which includes a silicon dioxide-based coating.

7. The ultraviolet optical cavity reaction chamber module according to any one of claims 1 to 5, characterized in that, It also includes at least one baffle (130) disposed at the inlet opening (110) and / or the outlet opening (120); The baffle (130) is configured to block the line-of-sight path of ultraviolet radiation from the internal chamber to the outside of the module while allowing airflow; The baffle (130) has a surface coated with a photocatalytic material, including titanium dioxide, and the baffle (130) is configured to drive the oxidative decomposition of air pollutants by using ultraviolet radiation intercepted thereon.

8. The ultraviolet optical cavity reaction chamber module according to claim 7, characterized in that, The inlet opening (110) and the outlet opening (120) each have a rectangular or square cross-section.

9. The ultraviolet optical cavity reaction chamber module according to any one of claims 1 to 5, characterized in that, The module is configured to be installed downstream of one or more particulate and vapor phase filters in an air handling unit to reduce the dust load on the reflective internal surface; the module is configured to be installed upstream of a fan module (300) in the air handling unit.

10. The ultraviolet optical cavity reaction chamber module according to claim 1, characterized in that, Multiple modules can be connected in series and / or in parallel within the same housing to form a multi-stage UVC enhancement cavity for handling high airflow rates.

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