222nm and 254nm dual-band synergistic ultraviolet water treatment device

Abstract

The application relates to the technical field of water treatment disinfection devices, in particular to a 222nm and 254nm dual-waveband synergistic ultraviolet water treatment device which synergistically uses 222nm far ultraviolet rays and 254nm conventional ultraviolet rays to efficiently inactivate, inhibit photoreactivation and degrade organic micro-pollutants. The device comprises a purification tank which is provided with a water inlet and a water outlet, the length direction of the connecting end of the water inlet is perpendicular to the axial direction and the radial direction of the purification tank; a 222nm far ultraviolet ray generating tube and a 254nm conventional ultraviolet ray generating tube are arranged in the interior of the purification tank and are arranged along the axial direction of the purification tank; a descaling disc is provided with a plurality of perforations, the descaling disc is arranged in the interior of the purification tank, and the 222nm far ultraviolet ray generating tube and the 254nm conventional ultraviolet ray generating tube are respectively inserted in different perforations; and a driving device is arranged on the purification tank, the descaling disc is driven to reciprocate along the axial direction of the purification tank by the driving device, and the dirt on the outer wall of the 222nm far ultraviolet ray generating tube and the 254nm conventional ultraviolet ray generating tube is cleaned.

Description

Technical Field

[0001] This application relates to the field of water treatment and disinfection device technology, and in particular to a dual-band synergistic ultraviolet water treatment device with 222nm and 254nm wavelengths. Background Technology

[0002] In modern water treatment engineering, ultraviolet (UV) disinfection technology has become one of the core processes for the advanced treatment of drinking water, reclaimed water, and industrial water due to its advantages such as broad-spectrum sterilization and the absence of disinfection byproducts. Among these, conventional UV disinfection devices, represented by low-pressure mercury lamps with a wavelength of 254 nm, are the most widely used. Its sterilization mechanism mainly utilizes the absorption of 254 nm photons by the deoxyribonucleic acid (DNA) within microorganisms, inducing the formation of photoproducts such as cyclobutanepyrimidine dimers from adjacent pyrimidine bases. This inhibits normal DNA transcription and replication, leading to the loss of reproductive capacity and inactivation of the microorganisms.

[0003] However, long-term engineering practice and research have revealed two deep-seated technical shortcomings in relying solely on the 254nm wavelength for water disinfection. The first shortcoming lies in the "photoreactivation" and "dark repair" capabilities of bacteria. After bacteria are inactivated by 254nm ultraviolet radiation, if visible light irradiates the treated water or water supply network, photoreactivation enzymes within the bacteria will be activated. Utilizing energy in the near-ultraviolet to blue light bands, these enzymes cleave and restore pyrimidine dimers on DNA through enzymatic reactions, repairing damaged genetic material and allowing the inactivated bacteria to regain activity and reproductive capacity. Furthermore, even under completely dark conditions, some microorganisms can repair DNA damage through dark repair mechanisms such as nucleotide excision. This phenomenon often leads to secondary microbial proliferation at the end of the water supply network, even though the effluent from the water treatment plant meets disinfection standards, resulting in significant deterioration of the effluent quality and posing a significant biosafety risk. The second shortcoming is that the photon energy of 254nm ultraviolet light is limited, making its direct photodegradation ability for increasingly concerning organic micropollutants in water extremely weak. Many trace organic compounds that are difficult to biodegrade, such as some drug residues, endocrine disruptors, and pesticide metabolites, have high chemical bond dissociation energies. 254nm photons cannot effectively break them down, making it impossible to simultaneously achieve disinfection and deep purification of organic matter. This requires the addition of an advanced oxidation unit, which increases the complexity of the process and operating costs.

[0004] In recent years, far-ultraviolet light with a peak wavelength of 222 nm has attracted widespread attention. Compared with traditional 254 nm ultraviolet light, 222 nm photons not only have higher single-photon energy but can also trigger more diverse biological damage mechanisms. In addition to causing irreversible damage to nucleic acids, 222 nm far-ultraviolet light can also induce severe lipid peroxidation of cell membranes, disrupting the integrity of membrane structures. More importantly, it can directly destroy the photoreactivation enzymes responsible for DNA repair within bacteria, blocking the photoreactivation pathway at its source, preventing microorganisms from self-repairing even after subsequent light exposure. Simultaneously, due to its high photon energy, 222 nm far-ultraviolet light readily breaks carbon-carbon double bonds, carbon-halogen bonds, and other chemical bonds, exhibiting strong direct photolysis and indirect oxidative degradation capabilities against various organic micropollutants.

[0005] Therefore, our team considered the synergistic application of 222nm far-ultraviolet light and 254nm conventional ultraviolet light, hoping to simultaneously achieve multiple objectives of complete inactivation, inhibition of photoreactivation, and degradation of organic micropollutants in the same reactor. However, in practice, although 222nm far-ultraviolet light has significant advantages in disinfection and degradation performance, it faces a serious physical obstacle in its long-term engineering application in water treatment.

[0006] For example, water molecules and naturally occurring organic matter in water have an extremely high absorption coefficient for 222nm wavelength far-ultraviolet light, resulting in a low penetration depth in clean water, far lower than the penetration distance of 254nm ultraviolet light. However, in traditional straight-tube flow reactors, the water flow often exhibits a distribution characteristic of high velocity in the main body and slow velocity near the wall. The fluid in the central region experiences weak radial exchange perpendicular to the irradiation direction, forming a distinct axial straight flow. This high-velocity fluid in the center is difficult to be fully irradiated by the 222nm ultraviolet light penetrating from the tube wall, thus creating a significant overall sterilization blind zone. This allows a large number of microorganisms and pollutants to penetrate the reactor without effective treatment, severely weakening the reliability of disinfection and purification. Summary of the Invention

[0007] The purpose of this application is to propose a dual-band synergistic ultraviolet water treatment device of 222nm and 254nm, which simultaneously and efficiently achieves multiple objectives such as inactivation, inhibition of photoreactivation, and degradation of organic micro-pollutants by synergistic application of 222nm far-ultraviolet light and 254nm conventional ultraviolet light.

[0008] To achieve the above objectives, this application adopts the following technical solution: A dual-band (222nm and 254nm) synergistic ultraviolet water treatment device includes: a purification tank with an inlet at one end and an outlet at the other; the inlet end is a connecting end connected to the side wall of the purification tank and communicating with it, with the length direction of the connecting end perpendicular to both the axial and radial directions of the purification tank; a 222nm far-ultraviolet generator and a 254nm conventional ultraviolet generator, both housed inside the purification tank; and both the 222nm far-ultraviolet generator and the 254nm conventional ultraviolet generator... The length direction is set along the axial direction of the purification tank; the descaling plate is provided with multiple perforations and is set inside the purification tank, with the 222nm far-ultraviolet generating tube and the 254nm conventional ultraviolet generating tube respectively inserted into different perforations, and the inner side of the perforation is in contact with the outer wall of the 222nm far-ultraviolet generating tube and the outer wall of the 254nm conventional ultraviolet generating tube; the driving device is set on the purification tank to drive the descaling plate to move back and forth along the axial direction of the purification tank to clean the dirt on the outer wall of the 222nm far-ultraviolet generating tube and the 254nm conventional ultraviolet generating tube.

[0009] Based on the above scheme and as a preferred option, multiple 222nm far-ultraviolet generating tubes and multiple 254nm conventional ultraviolet generating tubes are respectively provided.

[0010] Based on the above scheme and as a preferred option: the inlet is set at the top of the purification tank, the outlet is set at the bottom of the purification tank, and the two ends of the 222nm far-ultraviolet generating tube and the 254nm conventional ultraviolet generating tube are connected to the top and bottom respectively; and multiple 222nm far-ultraviolet generating tubes and multiple 254nm conventional ultraviolet generating tubes are evenly distributed around the central axis of the purification tank.

[0011] Based on the above scheme and as a preferred option, the 222nm far-ultraviolet generating tubes are distributed on one side close to the central axis of the purification tank, and the 254nm conventional ultraviolet generating tubes are distributed on one side close to the inner wall of the purification tank.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme: the purification tank is erected with its bottom below its top, and a mounting base for support is provided at the bottom, with connection holes provided on the mounting base.

[0013] Based on the above scheme and as a preferred option, the inlet is equipped with a dosing port for adding oxidant.

[0014] Based on the above scheme and as a preferred embodiment: a mixing box is provided at the water inlet, and the interior of the mixing box is a mixing chamber; a baffle plate is provided on the bottom side of the mixing chamber, and the lower side and both sides in the width direction of the baffle plate are connected to the inner wall of the mixing chamber, and there is a gap between the upper side and the inner wall of the mixing chamber; connection ports are provided on the two sides of the mixing box opposite to the thickness direction of the baffle plate, one connection port is connected to the water inlet, and the other connection port is provided with a water inlet pipe; a dosing pipe is provided on the mixing box, the upper end of the dosing pipe is a dosing interface, the dosing pipe extends into the mixing chamber from top to bottom, and the lower end of the dosing pipe extends between the water inlet pipe and the baffle plate.

[0015] Based on the above scheme and as a preferred embodiment of the above scheme: a spiral guide plate is provided inside the inlet end of the purification tank; the outer periphery of the spiral guide plate is connected to the inner wall of the purification tank, and the spiral axis of the spiral guide plate extends along the axial direction of the purification tank, thereby forming a guide groove tangential to the water outlet direction of the inlet inside the purification tank through the spiral guide plate.

[0016] Based on the above scheme and as a preferred embodiment of the above scheme: the driving device includes a lead screw rotatably mounted on the purification tank, the lead screw extending into the interior of the purification tank from the end of the purification tank and extending along the axial direction of the purification tank; a nut threadedly engaged with the lead screw is provided on the lead screw, and the nut is connected to the descaling disc; a drive motor is provided at one end of the purification tank, and the drive motor is connected to the lead screw to drive the lead screw to rotate.

[0017] Based on the above scheme and as a preferred embodiment of the above scheme: the inner wall of the purification tank is provided with a limiting protrusion extending along the axial direction, and the outer edge of the descaling plate is provided with a limiting groove that slides and engages with the limiting protrusion.

[0018] To address the challenge of synergistically applying 222nm far-ultraviolet light with 254nm conventional ultraviolet light, this application offers the following advantages: In use, the 222nm and 254nm dual-band synergistic ultraviolet water treatment device of this application adopts a dual-band synergistic irradiation structure in which a 222nm far-ultraviolet generating tube and a 254nm conventional ultraviolet generating tube are arranged axially in the purification tank. The 254nm ultraviolet light destroys the DNA of microorganisms, while the 222nm far-ultraviolet light causes cell membrane lipid peroxidation, directly destroys the photoreactivating enzyme responsible for DNA repair, and breaks the chemical bonds of organic micro-pollutants with high-energy photons.

[0019] The length direction of the inlet connection is perpendicular to both the axial and radial directions of the purification tank, which causes the water flow to form a tangential rotating vortex around the axis when entering the purification tank. This forces the fluid to mix fully in the radial direction, avoiding the formation of a 222nm far-ultraviolet sterilization blind zone in the high-speed zone of the axially flowing water center inside the purification tank.

[0020] The perforations on the descaling disc are tightly fitted to the sides of each 222nm far-ultraviolet generator and each 254nm conventional ultraviolet generator. This allows the descaling disc to be driven to reciprocate along the axial direction of the purification tank via a drive device, thereby achieving continuous scraping of dirt from the pipe walls.

[0021] This allows for the synergistic application of 222nm far-ultraviolet light and 254nm conventional ultraviolet light to simultaneously achieve multiple objectives, including efficient inactivation, inhibition of photoreactivation, and degradation of organic micropollutants.

[0022] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. These will be further described in detail below with reference to figures. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the ultraviolet water treatment and disinfection device of this application. Figure 2 This is a schematic diagram of the ultraviolet water treatment and disinfection device of this application in the cross-section of the purification tank. Figure 3 This is a schematic diagram of the drive device structure of this application; Figure 4 This is an enlarged view of part A of this application; Figure 5 This is a schematic diagram of the drug dispensing interface portion of the drug mixing box in the cut-out state of this application. Figure 6 This is a schematic diagram of the spiral guide plate arrangement in this application.

[0025] Explanation of reference numerals in the attached figures: 100. Purification tank; 101. Top; 102. Bottom; 103. Inlet; 104. Connection end; 105. Outlet; 200nm and 222nm far-ultraviolet generating tubes; 300nm and 254nm conventional ultraviolet generator tubes; 400. Descaling tray; 401. Perforation; 402. Water inlet; 500. Drive unit; 501. Lead screw; 502. Nut; 503. Drive motor; 504. Limiting protrusion; 505. Limiting groove; 600. Mounting base; 601. Connecting hole; 700. Dosing port; 701. Mixing box; 702. Mixing chamber; 703. Baffle plate; 704. Connection port; 705. Water inlet pipe; 706. Dosing pipe; 707. Switch valve; 800, Spiral guide plate; 801, Guide groove. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0028] In modern water treatment engineering, ultraviolet (UV) disinfection technology has become one of the core processes for the advanced treatment of drinking water, reclaimed water, and industrial water due to its advantages such as broad-spectrum sterilization and the absence of disinfection byproducts. However, long-term engineering practice and research have revealed that relying solely on the 254nm wavelength for water disinfection suffers from defects such as bacterial photoreactivation and dark repair, and cannot simultaneously achieve deep purification of organic matter.

[0029] See Figures 1-6 This application discloses a dual-band synergistic ultraviolet water treatment device of 222nm and 254nm. By synergistically applying 222nm far-ultraviolet light and 254nm conventional ultraviolet light, it can efficiently achieve multiple objectives such as inactivation, inhibition of photoreactivation and degradation of organic micro-pollutants.

[0030] In the embodiments of this disclosure, such as Figure 1 , Figure 2 As shown, the 222nm and 254nm dual-band synergistic ultraviolet water treatment device of this application includes a purification tank 100, a 222nm far-ultraviolet generating tube 200, a 254nm conventional ultraviolet generating tube 300, a descaling plate 400, and a drive device 500.

[0031] The purification tank 100 has a cylindrical structure. One end of the purification tank 100 is provided with an inlet 103 and the other end is provided with an outlet 105. One end of the inlet 103 is a connecting end 104, which is connected to the side wall of the purification tank 100 and communicates with the purification tank 100. The length direction of the connecting end 104 is perpendicular to both the axial and radial directions of the purification tank 100.

[0032] The 222nm far-ultraviolet generating tube 200 (ultraviolet lamp tube in the 222nm band) and the 254nm conventional ultraviolet generating tube 300 (ultraviolet lamp tube in the 254nm band) are both installed inside the purification tank 100, and the length direction of the 222nm far-ultraviolet generating tube 200 and the 254nm conventional ultraviolet generating tube 300 are arranged along the axial direction of the purification tank 100.

[0033] The descaling plate 400 is provided with multiple perforations 401. The descaling plate 400 is located inside the purification tank 100. The 222nm far-ultraviolet generating tube 200 and the 254nm conventional ultraviolet generating tube 300 are respectively inserted into different perforations 401, and the inner side of the perforation 401 is connected to the outer wall of the 222nm far-ultraviolet generating tube 200 and the outer wall of the 254nm conventional ultraviolet generating tube 300.

[0034] The drive device 500 is installed on the purification tank 100 to drive the descaling plate 400 to move back and forth along the axial direction of the purification tank 100, so as to clean the dirt on the outer wall of the 222nm far ultraviolet generating tube 200 and the 254nm conventional ultraviolet generating tube 300.

[0035] In use, the 222nm and 254nm dual-band synergistic ultraviolet water treatment device of this application adopts a dual-band synergistic irradiation structure in which a 222nm far-ultraviolet generating tube 200 and a 254nm conventional ultraviolet generating tube 300 are arranged axially in the purification tank 100. The 254nm ultraviolet light destroys the DNA of microorganisms, while the 222nm far-ultraviolet light causes cell membrane lipid peroxidation, directly destroys the photoreactivating enzyme responsible for DNA repair, and breaks the chemical bonds of organic micro-pollutants with high-energy photons.

[0036] The length direction of the inlet 103 connection end 104 is perpendicular to both the axial and radial directions of the purification tank 100, so that when the water flows into the purification tank 100, it forms a tangential rotating vortex around the axis, which forces the fluid to mix fully in the radial direction and avoids the formation of a 222nm far-ultraviolet sterilization blind zone in the high-speed zone of the axially flowing water center in the purification tank 100.

[0037] The perforations 401 on the descaling disc 400 are tightly fitted to the sides of each 222nm far-ultraviolet generator tube 200 and each 254nm conventional ultraviolet generator tube 300. This allows the descaling disc 400 to be driven by the drive device 500 to reciprocate along the axial direction of the purification tank 100, thereby achieving continuous scraping of dirt from the pipe wall.

[0038] In summary, this dual-band (222nm and 254nm) ultraviolet water treatment and disinfection device fundamentally blocks bacterial photoreactivation and dark repair, while also exhibiting strong degradation capabilities for organic micropollutants. This solves the problems of secondary microbial contamination risk and weak organic matter degradation when relying solely on 254nm ultraviolet light. Furthermore, the tangential swirling flow compensates for the limited penetration depth of 222nm far-ultraviolet light in water, eliminating the sterilization blind zone in the high-velocity area at the center of the reactor. Moreover, it eliminates the need for fixed baffles inside the reactor, ensuring unobstructed axial movement of the descaling disc 400 and achieving full-range automatic descaling. This significantly improves the disinfection reliability and long-term operational stability of the equipment.

[0039] In the embodiments of this disclosure, such as Figure 2 As shown, in order to ensure the working capability of this 222nm and 254nm dual-band synergistic ultraviolet water treatment device as much as possible, multiple 222nm far-ultraviolet generating tubes 200 and 254nm conventional ultraviolet generating tubes 300 are respectively provided.

[0040] Specifically, one end of the inlet 103 is set as the top 101 of the purification tank 100, and one end of the outlet 105 is set as the bottom 102 of the purification tank 100. The two ends of the 222nm far-ultraviolet generating tube 200 and the 254nm conventional ultraviolet generating tube 300 are respectively connected to the top 101 and the bottom 102; and the multiple 222nm far-ultraviolet generating tubes 200 and the multiple 254nm conventional ultraviolet generating tubes 300 are all evenly distributed around the central axis of the purification tank 100.

[0041] By positioning the inlet 103 at the top 101 of the purification tank 100 and the outlet 105 at the bottom 102, the two ends of the 222nm far-ultraviolet generating tube 200 and the 254nm conventional ultraviolet generating tube 300 are connected to the top 101 and bottom 102 respectively, and all generating tubes are arranged in a uniform ring around the central axis of the purification tank 100. Water enters tangentially from the top 101 and, under the combined action of gravity and swirling flow, spirals downwards along the gaps between the tubes, eventually exiting from the bottom 102. This ensures that all water flows through the radiation area formed by the 222nm far-ultraviolet and 254nm conventional ultraviolet rays multiple times and evenly during the flow process, avoiding low-dose irradiation dead zones, thereby significantly improving the overall disinfection efficiency and microbial inactivation effect.

[0042] Furthermore, based on the difference in optical characteristics between 222nm far-ultraviolet light and 254nm conventional ultraviolet light, which have extremely shallow penetration depth in water and relatively strong penetration depth, the 222nm far-ultraviolet light generating tubes 200 are concentrated in the central area near the central axis of the purification tank 100, while the 254nm conventional ultraviolet light generating tubes 300 are arranged in the outer area near the inner wall of the purification tank 100. That is, the 222nm far-ultraviolet light generating tubes 200 are distributed on one side near the central axis of the purification tank 100, and the 254nm conventional ultraviolet light generating tubes 300 are distributed on one side near the inner wall of the purification tank 100. This allows the weakly penetrating 222nm far-ultraviolet light to concentrate its effect on the central high-speed swirling zone, effectively disinfecting the water in that area and directly destroying photoreactivating enzymes, while the stronger penetrating 254nm conventional ultraviolet light is responsible for disinfecting the outer area. The two wavelengths form a complementary and synergistic radiation field in space, completely eliminating the blind spots in the direct flow sterilization and fully utilizing the disinfection potential of their respective wavelengths.

[0043] In this embodiment, the purification tank 100 is erected with its bottom 102 below its top 101. The bottom 102 is provided with a mounting base 600 for support, and the mounting base 600 has a connection hole 601. This provides an advantage by offering a stable and compact installation method for the equipment, facilitating engineering integration. For example, expansion bolts can be driven into the ground and then passed through the connection hole 601 for fixation.

[0044] In the embodiments of this disclosure, such as Figure 1 , Figure 5 As shown, the inlet 103 is provided with a dosing port 700 for adding oxidant.

[0045] Specifically, such as Figure 5 As shown, the inlet 103 is equipped with a mixing box 701, and the interior of the mixing box 701 is a mixing chamber 702. A baffle plate 703 is provided on the bottom side of the mixing chamber 702. The lower side and both sides of the baffle plate 703 in the width direction are connected to the inner wall of the mixing chamber 702, and there is a gap between the upper side and the inner wall of the mixing chamber 702. Connection ports 704 are provided on the two sides of the mixing box 701 opposite to the thickness direction of the baffle plate 703. One connection port 704 is connected to the inlet 103, and the other connection port 704 is equipped with a water inlet pipe 705. A dosing pipe 706 is provided on the mixing box 701. The upper end of the dosing pipe 706 is a dosing interface 700. The dosing pipe 706 extends into the mixing chamber 702 from top to bottom, and the lower end of the dosing pipe 706 extends between the water inlet pipe 705 and the baffle plate 703.

[0046] By installing a dosing interface 700 on the inlet 103, an oxidant (such as hydrogen peroxide) can be added to the water flow before it enters the purification tank 100. This utilizes ultraviolet light to catalyze the generation of strong oxidizing substances such as hydroxyl radicals. This enables the disinfection device to possess advanced oxidation capabilities, not only disinfecting but also synergistically degrading recalcitrant organic micropollutants in the water, further expanding the depth of water treatment and improving the quality of the effluent.

[0047] The system incorporates a mixing chamber 701 with a mixing cavity 702 upstream of the inlet 103. A baffle plate 703 is fixedly installed within the mixing cavity 702, with a flow gap on the upper side of the baffle plate 703 through which the oxidant mixture passes. A water inlet pipe 705 and the inlet 103 are connected to opposite sides of the baffle plate 703 in the thickness direction. The water inlet pipe 705 connects to a water source. Water flowing into the water inlet pipe 705 is forced to flow upwards by the baffle plate 703, creating localized turbulence and simultaneously mixing violently with the oxidant injected through the dosing pipe 706. This allows for uniform mixing of the reagent and water within a very short distance using the hydraulic structure itself, eliminating the need for additional power agitation. This avoids reduced advanced oxidation efficiency or byproduct formation due to uneven reagent mixing, ensuring stable reaction conditions for the water entering the purification tank 100.

[0048] The dosing pipe 706 may also be equipped with a check valve and a switch valve 707. The check valve (a conventional component, not shown) is mainly used to prevent water in the mixing box 701 from flowing towards the oxidant input source. The switch valve 707 is used to selectively add oxidant.

[0049] In the embodiments of this disclosure, such as Figure 2 , Figure 3 , Figure 6 As shown, a spiral guide plate 800 is provided inside one end of the purification tank 100 where the water inlet 103 is located; the outer periphery of the spiral guide plate 800 is connected to the inner wall of the purification tank 100, and the spiral axis of the spiral guide plate 800 extends along the axial direction of the purification tank 100, thereby forming a guide groove 801 tangential to the water outlet direction of the water inlet 103 inside the purification tank 100 through the spiral guide plate 800.

[0050] Furthermore, by installing a spiral guide plate 800 inside one end of the inlet 103 of the purification tank 100, a spiral guide channel 801 tangential to the outlet direction of the inlet 103 is formed in the water inlet area. The incoming tangential water flow is forced to form an orderly and continuous macroscopic spiral flow under the constraint of the guide channel 801. This generates a stronger and more stable overall vortex than simple tangential water inlet, forcing the fluid in the central high-speed zone to continuously exchange with the surrounding fluid, maximizing the compensation for the insufficient penetration depth of 222nm far-ultraviolet light, and eliminating sterilization blind spots.

[0051] It should be noted that the area where the spiral guide plate 800 is set restricts the entry of the descaling disc 400.

[0052] In this embodiment, the drive device 500 includes a lead screw 501 rotatably mounted on the purification tank 100. The lead screw 501 extends into the purification tank 100 from its end and extends along the axial direction of the purification tank 100. A nut 502 is threaded onto the lead screw 501 and is connected to the descaling disc 400. A drive motor 503 is mounted at one end of the purification tank 100 and is connected to the lead screw 501 to drive the lead screw 501 to rotate. The drive motor 503 is preferably a servo motor to facilitate control of the forming limit and movement speed. By using the drive motor 503 at the end of the purification tank 100 to drive the lead screw 501 to rotate, the rotational motion is converted into linear reciprocating movement of the nut 502 and the descaling disc 400 along the axial direction of the purification tank 100. It achieves precise mechanical drive and control of the movement of the descaling disc 400, and the cleaning stroke and frequency can be set as needed. It automatically completes the full-range scraping and descaling of the outer wall of the 222nm far-ultraviolet generating tube 200 and the 254nm conventional ultraviolet generating tube 300 online, ensuring the continuous cleanliness and high ultraviolet transmittance of the outer wall of the ultraviolet generating tube outer sleeve.

[0053] In some implementations, a sleeve is provided on the outside of the ultraviolet generating tube to prevent the descaling disc 400 from directly contacting the lamp tube, thereby improving its service life.

[0054] Furthermore, the inner wall of the purification tank 100 is provided with a limiting protrusion 504 extending along the axial direction, and the outer edge of the descaling disc 400 is provided with a limiting groove 505 that slides with the limiting protrusion 504, thereby forming a constraint pair that guides the descaling disc 400 axially and prevents its rotation in the circumference.

[0055] To ensure that the descaling disc 400 does not rotate circumferentially around its own axis when moving axially, each perforation 401 on the descaling disc 400 and the 222nm far-ultraviolet generating tube 200 or 254nm conventional ultraviolet generating tube 300 that it is inserted with always maintain the correct relative position and uniform gap, prevent jamming, uneven scraping or damage to the lamp tube caused by deflection, and ensure that the descaling operation is smooth and reliable.

[0056] In some implementations, such as Figure 2 , Figure 4 As shown, in addition to setting the limiting protrusion 504 to cooperate with the limiting protrusion 504, the circumferential torque of the descaling plate 400 on the 222nm far-ultraviolet generating tube 200 and the 254nm conventional ultraviolet generating tube 300 can also be limited and eliminated by setting a guide rod in the purification tank 100 and setting a linear bearing on the descaling plate 400 to cooperate with the guide plate.

[0057] It should be noted that, generally, the descaling plate 400 is placed at the bottom 102 of the purification tank 100, with the outlet 105 higher than the descaling plate 400; or the outlet 105 is located directly on the bottom 102 of the purification tank 100, but the descaling plate 400 is provided with a water passage 402 to avoid the water outlet. Furthermore, the descaling plate 400 is provided with multiple water passages 402 to prevent the descaling plate 400 from forming a closed space with the inner cavity of the purification tank 100. During the movement of the descaling plate 400, water can flow through the water passages 402, thus making the descaling plate 400 easy to move.

[0058] Of course, in some implementations, a gap may be left between the descaling plate 400 and the inner wall of the purification tank 100 to allow water to flow through.

[0059] In some embodiments, the descaling tray 400 is provided with a plurality of annular brushes (not shown), which are arranged corresponding to the 222nm far-ultraviolet generator 200 and the 254nm conventional ultraviolet generator 300, and surround the outer sides of the 222nm far-ultraviolet generator 200 and the 254nm conventional ultraviolet generator 300. This allows the annular brushes to move with the descaling tray 400 to remove dirt from the 222nm far-ultraviolet generator 200 and the 254nm conventional ultraviolet generator 300.

[0060] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-band (222nm and 254nm) synergistic ultraviolet water treatment device, characterized in that, include: A purification tank, wherein one end of the purification tank is provided with an inlet and the other end is provided with an outlet. One end of the inlet is a connecting end, which is connected to the side wall of the purification tank and communicates with the purification tank. The length direction of the connecting end is perpendicular to both the axial and radial directions of the purification tank. A 222nm far-ultraviolet generating tube and a 254nm conventional ultraviolet generating tube are both installed inside the purification tank, and the length direction of the 222nm far-ultraviolet generating tube and the 254nm conventional ultraviolet generating tube are arranged along the axial direction of the purification tank. The descaling tray has multiple perforations and is located inside the purification tank. The 222nm far-ultraviolet generating tube and the 254nm conventional ultraviolet generating tube are respectively inserted into different perforations, and the inner side of the perforation is in contact with the outer wall of the 222nm far-ultraviolet generating tube and the outer wall of the 254nm conventional ultraviolet generating tube. A driving device is provided on the purification tank to drive the descaling disc to reciprocate along the axial direction of the purification tank in order to clean the dirt on the outer walls of the 222nm far-ultraviolet generating tube and the 254nm conventional ultraviolet generating tube.

2. The 222nm and 254nm dual-band synergistic ultraviolet water treatment device according to claim 1, characterized in that, The number of the 222nm far-ultraviolet generating tubes and the number of the 254nm conventional ultraviolet generating tubes are each set in multiples.

3. The 222nm and 254nm dual-band synergistic ultraviolet water treatment device according to claim 2, characterized in that, One end of the water inlet is set as the top of the purification tank, and one end of the water outlet is set as the bottom of the purification tank. The two ends of the 222nm far-ultraviolet generating tube and the 254nm conventional ultraviolet generating tube are respectively connected to the top and the bottom. Furthermore, multiple 222nm far-ultraviolet generating tubes and multiple 254nm conventional ultraviolet generating tubes are evenly distributed around the central axis of the purification tank.

4. The 222nm and 254nm dual-band synergistic ultraviolet water treatment device according to claim 3, characterized in that, The 222nm far-ultraviolet generating tubes are distributed on one side close to the central axis of the purification tank, and the 254nm conventional ultraviolet generating tubes are distributed on one side close to the inner wall of the purification tank.

5. The 222nm and 254nm dual-band synergistic ultraviolet water treatment device according to claim 3, characterized in that, The purification tank is erected with its bottom below its top, and the bottom is provided with a mounting base for support, and the mounting base is provided with a connection hole.

6. The 222nm and 254nm dual-band synergistic ultraviolet water treatment device according to any one of claims 1-5, characterized in that, The inlet is equipped with a dosing port for adding oxidants.

7. The 222nm and 254nm dual-band synergistic ultraviolet water treatment device according to claim 6, characterized in that, The inlet is equipped with a mixing box, and the inside of the mixing box is a mixing chamber. A baffle plate is provided on the bottom side of the mixing chamber. The lower side and both sides of the baffle plate in the width direction are connected to the inner wall of the mixing chamber, and there is a gap between the upper side and the inner wall of the mixing chamber. The mixing box is provided with connection ports on both sides opposite to the thickness direction of the barrier plate. One connection port is connected to the water inlet, and the other connection port is provided with a water inlet pipe. The mixing box is equipped with a dosing tube, the upper end of which is the dosing interface. The dosing tube extends from top to bottom into the mixing chamber, and the lower end of the dosing tube extends between the water inlet pipe and the barrier plate.

8. The 222nm and 254nm dual-band synergistic ultraviolet water treatment device according to claim 1, characterized in that, The purification tank is equipped with a spiral guide plate inside one end of the water inlet; The outer periphery of the spiral guide plate is connected to the inner wall of the purification tank, and the spiral axis of the spiral guide plate extends along the axial direction of the purification tank, thereby forming a guide groove tangential to the water outlet direction inside the purification tank through the spiral guide plate.

9. The 222nm and 254nm dual-band synergistic ultraviolet water treatment device according to any one of claims 1-5 or 8, characterized in that, The driving device includes a lead screw rotatably mounted on the purification tank, the lead screw extending from the end of the purification tank into the interior of the purification tank and extending along the axial direction of the purification tank; The lead screw is provided with a threaded nut that engages with it, and the threaded nut is connected to the descaling disc; One end of the purification tank is equipped with a drive motor, which is connected to the lead screw to drive the lead screw to rotate.

10. The 222nm and 254nm dual-band synergistic ultraviolet water treatment device according to claim 9, characterized in that, The inner wall of the purification tank is provided with a limiting protrusion extending along the axial direction, and the outer edge of the descaling plate is provided with a limiting groove that slides with the limiting protrusion.

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