A UV-LED multi-wavelength intelligent drinking water disinfection device and method

Abstract

This invention relates to the field of drinking water disinfection equipment technology, and discloses a UV-LED multi-wavelength intelligent drinking water disinfection device and method, including a disinfection body and a VBNC online monitoring device connected to the disinfection body. This invention extends the irradiation path and residence time by forming a spiral main disinfection channel between the shell and the quartz cylinder. Combined with UV-LEDs arranged around the outer periphery of the quartz cylinder, it achieves omnidirectional uniform irradiation. Real-time scattering and fluorescence detection of the water body are performed through a circulating detection chamber connected to the sampling channel. The concentration and activity state of microorganisms in the sampled water can be obtained online without manual sampling. The driving power of different wavelength UV-LEDs can be adjusted accordingly to precisely match the UV irradiation dose with the microbial state of the water quality. This solves the problem of incomplete disinfection caused by conventional UV disinfection's inability to identify VBNC-risk microorganisms, while avoiding the potential resurgence risk of microorganisms entering the VBNC state at sublethal doses, thereby improving the safety and reliability of drinking water terminal disinfection.

Description

Technical Field

[0001] This invention relates to the field of drinking water disinfection equipment technology, and in particular to a UV-LED multi-wavelength intelligent drinking water disinfection device and method. Background Technology

[0002] Disinfection at the point of use of drinking water is a key measure to safeguard the safety of drinking water at the point of use. Water is prone to secondary pollution during pipeline transportation, secondary water supply storage, and equipment shutdown, which can lead to excessive levels of microorganisms and the growth of pathogens. Ultraviolet disinfection, with its advantages of no chemical additives, no disinfection byproducts, and high disinfection efficiency, is widely used in various drinking water terminal equipment. Moreover, with the maturity of UV-LED technology, replacing traditional mercury lamps with multi-wavelength UV-LEDs has become the mainstream development trend for terminal drinking water disinfection.

[0003] Existing ultraviolet disinfection devices typically include a disinfection unit and an ultraviolet light source. The disinfection unit has a flow channel for drinking water to pass through, and the ultraviolet light source is installed on the outer periphery or inside of the flow channel. The ultraviolet light irradiates the water flowing through it to inactivate microorganisms. When the ultraviolet dose is in the sub-lethal range, some damaged microorganisms may enter the VBNC state and cannot be detected by conventional testing, which poses a potential risk of microbial resurgence to drinking water safety. Therefore, it is difficult to meet the actual use requirements of high-quality end-point drinking water safety disinfection and long-term stable operation of equipment. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a UV-LED multi-wavelength intelligent drinking water disinfection device and method.

[0005] This invention provides a UV-LED multi-wavelength intelligent drinking water disinfection device, including a disinfection body and a VBNC online monitoring device connected to the disinfection body; The disinfection body includes a shell, a quartz cylinder, an LED metal substrate, and a UV-LED. The quartz cylinder is disposed inside the shell and forms a spiral main disinfection channel with the shell. The LED metal substrate is arranged around the outer periphery of the quartz cylinder, and the UV-LED is mounted on the LED metal substrate. The VBNC online monitoring device includes a circulating detection chamber connected to the main disinfection channel via a sampling channel. The circulating detection chamber is used to sample the water entering the main disinfection channel through the sampling channel, and to perform scattering and fluorescence detection on the microorganisms in the sampled water. The device also adjusts the driving power of the UV-LEDs in different wavelength bands according to the detection signal.

[0006] Furthermore, the circulating detection chamber is equipped with a scattering detection channel and a fluorescence detection channel. The scattering detection channel uses a UV-LED light source with a wavelength of 405nm or 450nm to irradiate the sampled water body. The amplitude A is obtained by capturing the scattered light signal generated by microorganisms in the sampled water body. The amplitude A represents the current total number of surviving bacteria. The fluorescence detection channel uses a UV-LED light source with a wavelength of 295nm or 405nm to irradiate the sampled water. The signal change slope k is obtained by capturing the autofluorescence signal generated by microorganisms in the sampled water after they are excited. The signal change slope k is used to characterize the trend of microbial activity change. The VBNC online monitoring device classifies the VBNC risk level into three levels: low, medium, and high, based on the slope k and amplitude A of the detected signal change. Low risk is defined as k < k1; Medium risk is defined as k1≤k<k2; High risk is defined as k ≥ k2; Among them, k1 is the dividing point between low risk and medium risk, and k2 is the dividing point between medium risk and high risk.

[0007] Furthermore, the VBNC online monitoring device also includes: The signal acquisition and processing unit is used to acquire, filter, and analyze the detection signals from the circulating detection chamber, and output control signals to characterize changes in the state of microorganisms. The UV-LED multi-channel driving and online control unit is electrically connected to the signal acquisition and processing unit and is used to adjust the driving power of the UV-LED in different bands according to the control signal. The temperature control / protection and communication unit is used to collect information on the device's temperature, flow rate, and operating status, and to perform power reduction, shutdown protection, or alarm output when the temperature exceeds the limit, the flow rate is abnormal, the detection signal is abnormal, or the cycle is interrupted.

[0008] Furthermore, the UV-LED includes 265nm UV-LED for nucleic acid damage inactivation; 280nm UV-LED for protein and membrane structure damage; 295nm UV-LED serves as an auxiliary band for VBNC suppression, used for microbial protein structures and membrane systems, and helps enhance the recovery inhibition effect of microorganisms after damage, thereby reducing the probability of damaged microorganisms entering the VBNC state and subsequent recovery. The 265nm, 280nm, and 295nm UV-LEDs are arranged in sections along the circumference and axial direction of the quartz cylinder.

[0009] Furthermore, the UV-LED multi-channel drive and online control unit is equipped with graded adjustment logic and mode switching hysteresis control logic; When the VBNC risk level changes from low to medium or high, the disinfection mode should be upgraded immediately. When the VBNC risk level changes from high to medium or low, it can only be downgraded after a preset continuous stable period N is met, where N is 3-10 detection cycles.

[0010] Furthermore, the tiered adjustment logic includes: Basic Mode M0: Only the 265nm band UV-LED is turned on, with a drive power of 30%-55% of the rated power; Enhanced Mode M1: Enables the 265nm band UV-LED and increases its drive power to 55%-80% of the rated power; Collaborative Mode M2: Simultaneously activates the 265nm UV-LED band and the 280nm UV-LED band, with the 265nm band driving power at 30%-85% of the rated power and the 280nm band driving power at 20%-60% of the rated power; Enhanced Synergy Mode M3: Simultaneously activates 265nm, 280nm, and 295nm UV-LEDs, with the 265nm band driving power at 30%-100% of the rated power, the 280nm band driving power at 35%-85% of the rated power, and the 295nm band driving power at 10%-60% of the rated power.

[0011] Furthermore, a flow-limiting valve, a flow-stabilizing column, and a micro magnetic pump are sequentially connected to the sampling channel. The inlet of the sampling channel is connected to the main disinfection channel, and the outlet of the micro magnetic pump is connected to the circulation detection chamber. This is used to introduce a portion of the water in the main disinfection channel into the circulation detection chamber, and the flow rate of the sampling channel is 1%-5% of the flow rate of the main disinfection channel.

[0012] Furthermore, the disinfection body also includes heat dissipation fins, heat conduction pipes, and a copper core; The heat dissipation fins are provided on the outer side wall of the housing; The heat pipe is disposed on the inner side of the quartz cylinder, and the LED metal substrate is disposed around the outer side wall of the heat pipe and located between the quartz cylinder and the heat pipe. The copper core is disposed inside the heat pipe and arranged along the axial direction of the housing, and the heat pipe is thermally connected to the LED metal substrate and the copper core. The copper core is provided with an upper cover and a base at both ends, and the upper cover and the base are respectively fixedly installed at both ends of the housing; The heat pipe is arranged along the axial direction of the copper core and conducts the heat generated by the LED metal substrate to the top cover and the base, and then the heat is transferred from the top cover and the base to the heat dissipation fins on the outer wall of the housing for heat dissipation.

[0013] Furthermore, a buffer chamber is provided on the main disinfection channel between the VBNC online monitoring device and the disinfection body. The buffer chamber is used to extend the residence time of the water in the main disinfection channel when it reaches the core irradiation area of ​​the disinfection body, so that the circulation detection chamber can complete the VBNC risk judgment and UV-LED drive power adjustment before this part of the water enters the core irradiation area of ​​the main disinfection body.

[0014] A disinfection method for a UV-LED multi-wavelength intelligent drinking water disinfection device includes the following steps: Drinking water enters the spiral main disinfection channel formed by the quartz cylinder through the inlet of the shell, and at the same time, a portion of the water is diverted through the sampling channel into the circulation detection chamber of the VBNC online monitoring device; The circulating detection chamber performs scattering and fluorescence detection on microorganisms in the sampled water, and adjusts the driving power of the UV-LED in different wavelength bands according to the detection signal. The water in the main disinfection channel flows through the core irradiation area between the quartz cylinder and the LED metal substrate in a spiral channel, and is disinfected by multi-wavelength ultraviolet radiation from the UV-LED. The disinfected water is then discharged from the outlet of the main disinfection body, completing the disinfection process.

[0015] The technical solution provided by this invention has the following advantages compared with the prior art: The spiral main disinfection channel formed between the shell and the quartz cylinder effectively extends the irradiation path and residence time of the water in a limited space, allowing the ultraviolet light emitted by the UV-LED to fully irradiate the water, avoiding short-flow and localized low-dose areas, and significantly improving disinfection uniformity and inactivation efficiency. Furthermore, the LED metal substrate is arranged around the outer periphery of the quartz cylinder, ensuring uniform circumferential arrangement of the UV-LEDs, achieving all-round, dead-angle-free ultraviolet irradiation of the water flowing through the main disinfection channel, avoiding the uneven irradiation problem caused by traditional single-sided light sources. Simultaneously, the sampling channel and the main disinfection channel... The connected circulation detection chamber 13 performs real-time bypass sampling of the water entering the main disinfection channel and performs scattering and fluorescence detection on the microorganisms in the sampled water. It can obtain the concentration and activity status of microorganisms in the sampled water online without manual sampling, and adjust the driving power of UV-LEDs of different bands accordingly to accurately match the UV irradiation dose with the actual microbial state of the water. This effectively solves the problem of incomplete disinfection caused by conventional UV disinfection due to its inability to identify VBNC risk microorganisms. At the same time, it avoids the potential resurgence risk caused by some microorganisms entering the VBNC state when the UV dose is in the sublethal range, thereby improving the safety of drinking water terminal disinfection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a UV-LED multi-wavelength intelligent drinking water disinfection device provided in an embodiment of the present invention; Figure 2 A cross-sectional view of the disinfection body provided in an embodiment of the present invention; Figure 3 A top view of the disinfection body provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the VBNC online monitoring device provided in an embodiment of the present invention; Figure 5 A flowchart of VBNC online monitoring and risk classification control provided for embodiments of the present invention; Figure 6 The present invention provides a logic diagram for UV-LED multi-mode graded driving and hysteresis control in an embodiment of the invention.

[0017] Explanation of reference numerals in the attached figures: 1. Top cover; 2. Base; 3. Heat dissipation fins; 4. Housing; 5. Quartz cylinder; 6. LED metal substrate; 7. Heat pipe; 8. Copper core; 9. UV-LED; 10. Flow limiting valve; 11. Flow stabilizing column; 12. Miniature magnetic pump; 13. Circulation detection chamber; 14. Signal acquisition and processing unit; 15. UV-LED multi-channel drive and online control unit; 16. Temperature control / protection and communication unit; 17. Buffer chamber. Detailed Implementation

[0018] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] The present invention will be described below through several specific embodiments. To keep the following description of the embodiments clear and concise, detailed descriptions of known functions and components may be omitted. When any component of an embodiment of the present invention appears in more than one drawing, the component may be represented by the same reference numerals in each drawing.

[0021] like Figures 1-6 As shown, this embodiment of the invention provides a UV-LED multi-wavelength intelligent drinking water disinfection device, including a disinfection body and a VBNC online monitoring device connected to the disinfection body; The disinfection body includes a shell 4, a quartz cylinder 5, an LED metal substrate 6 and a UV-LED 9. The quartz cylinder 5 is located inside the shell 4 and forms a spiral main disinfection channel with the shell 4. The LED metal substrate 6 is arranged around the outer periphery of the quartz cylinder 5 and the UV-LED 9 is mounted on the LED metal substrate 6. The VBNC online monitoring device includes a circulating detection chamber 13 that is connected to the main disinfection channel through a sampling channel. The circulating detection chamber 13 is used to sample the water entering the main disinfection channel through the sampling channel, and to perform scattering detection and fluorescence detection on the microorganisms in the sampled water. The driving power of the UV-LED9 in different bands is adjusted according to the detection signal. The drinking water to be disinfected flows into the disinfection unit from the inlet, slowly flowing along the spiral main disinfection channel between the shell 4 and the quartz cylinder 5 to prolong the irradiation path and time. Simultaneously, a portion of the water is diverted through the sampling channel into the circulation detection chamber 13 of the VBNC online monitoring device. The circulation detection chamber 13 performs scattering and fluorescence detection on the microorganisms in the sampled water, analyzing the concentration and activity status of the microorganisms in the sampled water in real time. Subsequently, based on the feedback from the detection signal, the driving power of different bands of UV-LED9 is adjusted to precisely match the ultraviolet irradiation dose with the actual microbial state of the water quality. Then, the main... The water in the disinfection channel flows through the core irradiation area between the quartz cylinder 5 and the LED metal substrate 6 in a spiral channel. It is disinfected by multi-wavelength ultraviolet light emitted by the UV-LED9 surrounding the quartz cylinder 5. Finally, the disinfected water is discharged from the outlet of the shell. This effectively solves the problem of incomplete disinfection caused by conventional ultraviolet disinfection due to its inability to identify VBNC risk microorganisms. At the same time, it avoids the potential risk of resuscitation caused by some microorganisms entering the VBNC state when the ultraviolet dose is in the sub-lethal range, thereby improving the safety of drinking water terminal disinfection.

[0022] Furthermore, such as Figures 1-6 As shown, the circulating detection chamber 13 is equipped with a scattering detection channel and a fluorescence detection channel. The scattering detection channel uses a UV-LED9 light source with a wavelength of 405nm or 450nm to irradiate the sampled water body. The amplitude A is obtained by capturing the scattered light signal generated by microorganisms in the sampled water body. The amplitude A represents the current total number of surviving bacteria. The fluorescence detection channel uses a UV-LED9 light source with a wavelength of 295nm or 405nm to irradiate the sampled water. The signal change slope k is obtained by capturing the autofluorescence signal generated by microorganisms in the sampled water after they are excited. The signal change slope k is used to characterize the trend of microbial activity change. The VBNC online monitoring device classifies the VBNC risk level into three levels: low, medium, and high based on the slope k and amplitude A of the detected signal change. Low risk is defined as k < k1; Medium risk is defined as k1≤k<k2; High risk is defined as k ≥ k2; Among them, k1 is the dividing point between low risk and medium risk, and k2 is the dividing point between medium risk and high risk; By setting up a scattering detection channel and a fluorescence detection channel in the circulation detection chamber 13, the scattering detection channel uses a UV-LED9 light source with a wavelength of 405nm or 450nm to irradiate the sampled water and capture the scattered light signal generated by microorganisms to obtain the amplitude A, which represents the current total number of surviving bacteria. The fluorescence detection channel uses a UV-LED9 light source with a wavelength of 295nm or 405nm to irradiate the sampled water and capture the autofluorescence signal generated by microorganisms after excitation to obtain the signal change slope k, which represents the trend of microbial activity change. The VBNC online monitoring device classifies the VBNC risk level into three levels: low, medium, and high according to the signal change slope k and amplitude A. When k < k1, it is judged as low risk and the current operating parameters are maintained. When k1 ≤ k < k2, it is judged as medium risk and the driving power of the corresponding UV-LED is appropriately increased and the irradiation time is increased. When k ≥ k2, it is judged as high risk and high-dose multi-band synergistic irradiation is immediately started and an early warning signal is triggered. This enables real-time risk assessment and graded response to microorganisms entering the VBNC state during disinfection, ensuring stable and reliable disinfection effect.

[0023] Furthermore, such as Figures 1-6 As shown, the VBNC online monitoring device also includes: The signal acquisition and processing unit 14 is used to acquire, filter and analyze the detection signal of the circulating detection chamber 13, and output control signals to characterize changes in the state of microorganisms. The UV-LED multi-channel drive and online control unit 15 is electrically connected to the signal acquisition and processing unit 14 and is used to adjust the drive power of UV-LED 9 in different bands according to the control signal. The temperature control / protection and communication unit 16 is used to collect information on the device's temperature, flow rate, and operating status. When the temperature exceeds the limit, the flow rate is abnormal, the detection signal is abnormal, or the cycle is interrupted, it will perform power reduction, shutdown protection, or alarm output. The signal acquisition and processing unit 14 performs filtering analysis and feature extraction on the microbial status signal fed back from the detection chamber and outputs control commands to the UV-LED multi-channel drive and online control unit 15. This allows the operating parameters of each UV-LED band to be adjusted independently in real time according to changes in water quality. At the same time, the temperature control / protection and communication unit 16 monitors the device's temperature, flow rate, and operating status throughout the process. When abnormalities occur, it will automatically reduce power, shut down, or issue an alarm, thereby ensuring the safe, stable, and efficient operation of the device.

[0024] Furthermore, such as Figures 1-6 As shown, the UV-LED9 includes 265nm UV-LED for nucleic acid damage inactivation; 280nm UV-LED for protein and membrane structure damage; 295nm UV-LED serves as an auxiliary band for VBNC suppression, used for microbial protein structures and membrane systems, and helps enhance the recovery inhibition effect of microorganisms after damage, thereby reducing the probability of damaged microorganisms entering the VBNC state and subsequent recovery. The 265nm, 280nm and 295nm UV-LEDs are arranged in sections along the circumference and axial direction of the quartz cylinder 5. The device achieves efficient inactivation by directly damaging microbial nucleic acids in the 265nm band, enhances the bactericidal effect by destroying protein and cell membrane structures in the 280nm band, and assists in inhibiting microbial protein and membrane systems and reducing their entry into the VBNC state and subsequent resuscitation probability in the 295nm band. The three bands of UV-LEDs are arranged in five circumferential and axial sections along the quartz cylinder to achieve uniform light intensity coverage throughout the entire flow channel. Each wavelength can be independently controlled without interference, thus achieving multi-target synergistic inactivation of different microorganisms in the same device. This not only enhances the conventional bactericidal effect but also inhibits the VBNC transformation and resuscitation of damaged microorganisms from the source, thereby improving the thoroughness and safety of disinfection.

[0025] Furthermore, such as Figures 1-6 As shown, the UV-LED multi-channel drive and online control unit 15 is equipped with graded adjustment logic and mode switching hysteresis control logic; When the VBNC risk level changes from low to medium or high, the disinfection mode should be immediately upgraded. When the VBNC risk level changes from high to medium or low, it must meet a preset continuous stable period N (3-10 detection cycles) before it can be downgraded. This ensures that the disinfection intensity is rapidly increased under high-risk conditions to protect water quality. When the VBNC risk level changes from high to medium or low, it must meet a preset continuous stable period N (3-10 detection cycles) before it can be downgraded. This avoids equipment vibration and energy waste caused by frequent switching of disinfection modes due to fluctuations in a single detection, ensuring the stability and reliability of the system during long-term continuous operation.

[0026] Furthermore, such as Figures 1-6 As shown, the tiered adjustment logic includes: Basic Mode M0: Only the 265nm band UV-LED is turned on, with a drive power of 30%-55% of the rated power; Enhanced Mode M1: Enables the 265nm band UV-LED and increases its drive power to 55%-80% of the rated power; Collaborative Mode M2: Simultaneously activates the 265nm UV-LED band and the 280nm UV-LED band, with the 265nm band driving power at 30%-85% of the rated power and the 280nm band driving power at 20%-60% of the rated power; Enhanced Synergy Mode M3: Simultaneously activates 265nm, 280nm, and 295nm UV-LEDs, with the 265nm band driving power at 30%-100% of its rated power, the 280nm band driving power at 35%-85% of its rated power, and the 295nm band driving power at 10%-60% of its rated power. The UV-LED multi-channel drive and online control unit 15 sets up a four-level adjustment logic: basic mode M0, enhanced mode M1, synergistic mode M2, and enhanced synergistic mode M3. Based on the VBNC risk level, different band combinations and drive power are dynamically matched. In low-risk situations, only 265nm low-power operation is activated to save energy. In medium-risk situations, the 265nm power is increased to enhance the sterilization effect. In high-risk situations, multiple bands of 265nm, 280nm, and 295nm are activated in synergistic ways to utilize the synergistic damage effect of different wavelengths of ultraviolet light on microorganisms. Precise intervention is achieved through progressively increasing power and band combinations, which can ensure the disinfection effect while avoiding excessive energy consumption.

[0027] Furthermore, such as Figures 1-6 As shown, a flow-limiting valve 10, a flow-stabilizing column 11, and a miniature magnetic pump 12 are connected sequentially to the sampling channel. The inlet of the sampling channel is connected to the main disinfection channel, and the outlet of the miniature magnetic pump 12 is connected to the circulation detection chamber 13. This allows a portion of the water from the main disinfection channel to be introduced into the circulation detection chamber 13. The flow rate of the sampling channel is 1%-5% of the flow rate of the main disinfection channel. Through the flow-limiting valve 10, the flow-stabilizing column 11, and the miniature magnetic pump 12 connected sequentially to the sampling channel, the flow-limiting valve 10 regulates the sampling flow rate to 1%-5% of the main disinfection channel flow rate to avoid excessive water intake affecting the main disinfection channel. The hydraulic state and water quality stability of the channel are monitored. The flow stabilizing column 11 eliminates the flow pulsation and pressure fluctuation caused by the intermittent operation of the micro magnetic pump 12 to ensure that the flow rate of the sampled water entering the circulation detection chamber 13 is uniform and stable, thereby ensuring the accuracy of the scattering detection and fluorescence detection signals. The micro magnetic pump 12 provides a stable driving force to continuously introduce the water sample in the main disinfection channel into the circulation detection chamber 13, realizing micro-volume, stable flow, and continuous sampling. This ensures that the online monitoring device can capture the dynamic changes in water quality during the disinfection process in real time, thereby providing a reliable sample basis for the accurate judgment of the VBNC risk level.

[0028] Furthermore, such as Figures 1-6 As shown, the disinfection body also includes heat dissipation fins 3, heat conduction pipes 7, and copper core 8; The heat dissipation fins 3 are located on the outer side wall of the housing 4; The heat pipe 7 is located inside the quartz cylinder 5, and the LED metal substrate 6 is arranged around the outer wall of the heat pipe 7 and located between the quartz cylinder 5 and the heat pipe 7. The copper core 8 is located inside the heat pipe 7 and is arranged along the axial direction of the housing 4. The heat pipe 7 is thermally connected to the LED metal substrate 6 and the copper core 8. The copper core 8 has an upper cover 1 and a base 2 at its two ends, and the upper cover 1 and the base 2 are fixedly installed at both ends of the housing 4. The heat pipe 7 is arranged axially along the copper core 8 and conducts the heat generated by the LED metal substrate 6 to the upper cover 1 and the base 2. Then, the heat is transferred from the upper cover 1 and the base 2 to the heat dissipation fins 3 on the outer wall of the housing 4 for heat dissipation. The high thermal conductivity of the copper core 8, together with the heat pipe 7, forms an axial rapid heat conduction path. The heat generated by the high-power dense arrangement of UV-LED9 is conducted from the space between the quartz cylinder 5 and the LED metal substrate 6 to both ends of the housing 4. Then, it exchanges heat with the outside air through the heat dissipation fins 3. This effectively reduces the junction temperature of the UV-LED9, ensures the wavelength stability and output luminous efficacy of the UV-LED9 in each band under high-power continuous operation, avoids light decay and shortened lifespan due to heat accumulation, and thus ensures the long-term stable operation of the disinfection device.

[0029] Furthermore, such as Figures 1-6 As shown, a buffer chamber 17 is provided on the main disinfection channel between the VBNC online monitoring device and the disinfection body. The buffer chamber 17 is used to extend the residence time of the water in the main disinfection channel before it reaches the core irradiation area of ​​the disinfection body. This allows the circulation detection chamber 13 to complete VBNC risk assessment and UV-LED9 drive power adjustment before the water enters the core irradiation area of ​​the main disinfection body. By extending the residence time of the water before entering the core irradiation area, the buffer chamber 17 provides a sufficient response window for the VBNC online monitoring device to complete risk assessment and UV-LED9 drive power adjustment. This ensures that the regulated ultraviolet irradiation can accurately match the actual microbial risk status of the water about to enter the irradiation area, thereby avoiding disinfection mismatch caused by lag in regulation.

[0030] like Figures 1-6 As shown, a disinfection method for a UV-LED multi-wavelength intelligent drinking water disinfection device includes the following steps: Water intake and diversion sampling: Drinking water enters the spiral main disinfection channel formed by the quartz cylinder 5 through the water inlet of the shell 4. At the same time, 1%-5% of the water is automatically diverted through the sampling channel to the VBNC online monitoring device. The diversion ratio is dynamically adjusted according to the flow rate of the main disinfection channel to obtain sampled water while ensuring the main disinfection efficiency. VBNC Online Detection and Risk Assessment: The sampled water body is sequentially controlled by a flow-limiting valve 10 to precisely control the sampling flow rate, and a flow-stabilizing column 11 to stabilize the water flow state and eliminate the influence of pressure fluctuations on the detection accuracy. Then, it is pumped into the circulation detection chamber 13 by a micro magnetic pump 12. The scattering detection channel uses a UV-LED9 light source with a wavelength of 405nm or 450nm to irradiate the sampled water body, capturing the scattered light signal generated by microorganisms and obtaining the amplitude A to characterize the current total number of surviving bacteria. The fluorescence detection channel uses a UV-LED9 light source with a wavelength of 295nm or 405nm to irradiate the sampled water body, capturing the autofluorescence signal generated by microorganisms after excitation and obtaining the signal change slope k to characterize the trend of microbial activity change. The signal acquisition and processing unit 14 of the VBNC online monitoring device calculates the VBNC risk level based on the detection signal change slope k and amplitude A. When k < k1, it is judged as low risk; When k1≤k<k2, it is judged as medium risk; When k≥k2, it is judged as high risk; Among them, k1 is the dividing point between low risk and medium risk, and k2 is the dividing point between medium risk and high risk; Water flow and buffer delay after detection: After the water has been detected in the circulation detection chamber 13, it flows back to the main disinfection channel and mixes thoroughly with the original water in the buffer chamber 17. The buffer chamber 17 extends the residence time of the water before it enters the core irradiation area, providing a sufficient response window for subsequent UV-LED9 control, and ensuring that the control command takes effect before the water reaches the irradiation area. Tiered regulation and hysteresis decision-making: The UV-LED multi-channel drive and online control unit 15 executes tiered regulation logic based on the determined VBNC risk level. Low risk: Switch to basic mode M0, only turn on the 265nm band UV-LED, and drive power at 30%-55% of rated power; Medium risk: Switch to enhanced mode M1, turn on the 265nm band UV-LED and increase its drive power to 55%-80% of the rated power; High risk: Switch to Cooperative Mode M2 ​​or Enhanced Cooperative Mode M3. Cooperative Mode M2 ​​simultaneously activates the 265nm and 280nm UV-LEDs, with the 265nm UV-LED driving power at 30%-85% of its rated power and the 280nm UV-LED driving power at 20%-60% of its rated power. Enhanced Cooperative Mode M3 simultaneously activates the 265nm, 280nm, and 295nm UV-LEDs, with the 265nm UV-LED driving power at 30%-100% of its rated power, the 280nm UV-LED driving power at 35%-85% of its rated power, and the 295nm UV-LED driving power at 10%-60% of its rated power. Mode switching executes hysteresis control logic: when the VBNC risk level changes from low to medium or high, the disinfection mode is immediately upgraded; when the risk level changes from high to medium or low, it must be stable for N consecutive detection cycles (N=3-10) before it can be downgraded to avoid frequent mode switching and UV-LED status oscillation caused by detection fluctuations. Multi-wavelength ultraviolet irradiation disinfection: The water in the main disinfection channel flows slowly through the core irradiation area between the quartz cylinder 5 and the LED metal substrate 6 in a spiral channel. 265nm, 280nm and 295nm UV-LEDs are arranged in sections along the circumference and axis of the quartz cylinder 5. According to the determined disinfection mode, the water is disinfected by multi-wavelength ultraviolet irradiation. The three bands work together: 265nm UV-LED damages microbial nucleic acid, 280nm UV-LED destroys protein and cell membrane structure, and 295nm UV-LED assists in inhibiting the transformation and recovery of microbial VBNC. Real-time thermal management: The copper core 8, heat pipe 7 and LED metal substrate 6 form an efficient heat conduction path, which conducts the heat generated by UV-LED9 along the axis to the top cover 1 and base 2, and then dissipates it quickly through the heat dissipation fins 3 on the outside of the housing 4. The temperature control / protection and communication unit 16 collects the device temperature, flow rate and operating status information in real time. When the temperature exceeds the limit, the flow rate is abnormal, the detection signal is abnormal or the cycle is interrupted, the power reduction, shutdown protection or alarm output is executed to ensure that UV-LED9 always works in a suitable temperature range. Disinfected water discharge: The water that has been thoroughly disinfected by multi-wavelength ultraviolet irradiation is discharged from the outlet of the disinfection unit, completing the disinfection process.

[0031] The above inventions are merely a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A UV-LED multi-wavelength intelligent drinking water disinfection device, characterized in that, Includes a disinfection unit and a VBNC online monitoring device connected to the disinfection unit; The disinfection body includes a shell, a quartz cylinder, an LED metal substrate, and a UV-LED. The quartz cylinder is disposed inside the shell and forms a spiral main disinfection channel with the shell. The LED metal substrate is arranged around the outer periphery of the quartz cylinder, and the UV-LED is mounted on the LED metal substrate. The VBNC online monitoring device includes a circulating detection chamber connected to the main disinfection channel via a sampling channel. The circulating detection chamber is used to sample the water entering the main disinfection channel through the sampling channel, and to perform scattering and fluorescence detection on the microorganisms in the sampled water. The device also adjusts the driving power of the UV-LEDs in different wavelength bands according to the detection signal.

2. The UV-LED multi-wavelength intelligent drinking water disinfection device as described in claim 1, characterized in that, The circulating detection chamber is equipped with a scattering detection channel and a fluorescence detection channel. The scattering detection channel uses a UV-LED light source with a wavelength of 405nm or 450nm to irradiate the sampled water body. The amplitude A is obtained by capturing the scattered light signal generated by microorganisms in the sampled water body. The amplitude A represents the current total number of surviving bacteria. The fluorescence detection channel uses a UV-LED light source with a wavelength of 295nm or 405nm to irradiate the sampled water. The signal change slope k is obtained by capturing the autofluorescence signal generated by microorganisms in the sampled water after they are excited. The signal change slope k is used to characterize the trend of microbial activity change. The VBNC online monitoring device classifies the VBNC risk level into three levels: low, medium, and high, based on the slope k and amplitude A of the detected signal change. Low risk is defined as k < k1; Medium risk is defined as k1≤k<k2; High risk is defined as k ≥ k2; Among them, k1 is the dividing point between low risk and medium risk, and k2 is the dividing point between medium risk and high risk.

3. The UV-LED multi-wavelength intelligent drinking water disinfection device as described in claim 1, characterized in that, The VBNC online monitoring device also includes: The signal acquisition and processing unit is used to acquire, filter, and analyze the detection signals from the circulating detection chamber, and output control signals to characterize changes in the state of microorganisms. The UV-LED multi-channel driving and online control unit is electrically connected to the signal acquisition and processing unit and is used to adjust the driving power of the UV-LED in different bands according to the control signal. The temperature control / protection and communication unit is used to collect information on the device's temperature, flow rate, and operating status, and to perform power reduction, shutdown protection, or alarm output when the temperature exceeds the limit, the flow rate is abnormal, the detection signal is abnormal, or the cycle is interrupted.

4. The UV-LED multi-wavelength intelligent drinking water disinfection device as described in claim 3, characterized in that, The UV-LED includes 265nm UV-LED for nucleic acid damage inactivation; 280nm UV-LED for protein and membrane structure damage; 295nm UV-LED serves as an auxiliary band for VBNC suppression, used for microbial protein structures and membrane systems, and helps enhance the recovery inhibition effect of microorganisms after damage, thereby reducing the probability of damaged microorganisms entering the VBNC state and subsequent recovery. The 265nm, 280nm, and 295nm UV-LEDs are arranged in sections along the circumference and axial direction of the quartz cylinder.

5. The UV-LED multi-wavelength intelligent drinking water disinfection device as described in claim 4, characterized in that, The UV-LED multi-channel drive and online control unit is equipped with graded adjustment logic and mode switching hysteresis control logic; When the VBNC risk level changes from low to medium or high, the disinfection mode should be upgraded immediately. When the VBNC risk level changes from high to medium or low, it can only be downgraded after a preset continuous stable period N is met, where N is 3-10 detection cycles.

6. The UV-LED multi-wavelength intelligent drinking water disinfection device as described in claim 5, characterized in that, The graded adjustment logic includes: Basic Mode M0: Only the 265nm band UV-LED is turned on, with a drive power of 30%-55% of the rated power; Enhanced Mode M1: Enables the 265nm band UV-LED and increases its drive power to 55%-80% of the rated power; Collaborative Mode M2: Simultaneously activates the 265nm UV-LED band and the 280nm UV-LED band, with the 265nm band driving power at 30%-85% of the rated power and the 280nm band driving power at 20%-60% of the rated power; Enhanced Synergy Mode M3: Simultaneously activates 265nm, 280nm, and 295nm UV-LEDs, with the 265nm band driving power at 30%-100% of the rated power, the 280nm band driving power at 35%-85% of the rated power, and the 295nm band driving power at 10%-60% of the rated power.

7. The UV-LED multi-wavelength intelligent drinking water disinfection device as described in claim 1, characterized in that, A flow-limiting valve, a flow-stabilizing column, and a micro magnetic pump are connected in sequence to the sampling channel. The inlet of the sampling channel is connected to the main disinfection channel, and the outlet of the micro magnetic pump is connected to the circulation detection chamber. The sampling channel is used to introduce a portion of the water in the main disinfection channel into the circulation detection chamber, and the flow rate of the sampling channel is 1%-5% of the flow rate of the main disinfection channel.

8. The UV-LED multi-wavelength intelligent drinking water disinfection device as described in claim 1, characterized in that, The disinfection body also includes heat dissipation fins, heat conduction pipes, and a copper core; The heat dissipation fins are provided on the outer side wall of the housing; The heat pipe is disposed on the inner side of the quartz cylinder, and the LED metal substrate is disposed around the outer side wall of the heat pipe and located between the quartz cylinder and the heat pipe. The copper core is disposed inside the heat pipe and arranged along the axial direction of the housing, and the heat pipe is thermally connected to the LED metal substrate and the copper core. The copper core is provided with an upper cover and a base at both ends, and the upper cover and the base are respectively fixedly installed at both ends of the housing; The heat pipe is arranged along the axial direction of the copper core and conducts the heat generated by the LED metal substrate to the top cover and the base, and then the heat is transferred from the top cover and the base to the heat dissipation fins on the outer wall of the housing for heat dissipation.

9. The UV-LED multi-wavelength intelligent drinking water disinfection device as described in claim 1, characterized in that, A buffer chamber is provided on the main disinfection channel between the VBNC online monitoring device and the disinfection body. The buffer chamber is used to extend the residence time of the water in the main disinfection channel when it reaches the core irradiation area of ​​the disinfection body, so that the circulation detection chamber can complete the VBNC risk judgment and UV-LED drive power adjustment before this part of the water enters the core irradiation area of ​​the main disinfection body.

10. A disinfection method based on the UV-LED multi-wavelength intelligent drinking water disinfection device according to any one of claims 1-9, characterized in that, Includes the following steps: Drinking water enters the spiral main disinfection channel formed by the quartz cylinder through the inlet of the shell, and at the same time, a portion of the water is diverted through the sampling channel into the circulation detection chamber of the VBNC online monitoring device; The circulating detection chamber performs scattering and fluorescence detection on microorganisms in the sampled water, and adjusts the driving power of the UV-LED in different wavelength bands according to the detection signal. The water in the main disinfection channel flows through the core irradiation area between the quartz cylinder and the LED metal substrate in a spiral channel, and is disinfected by multi-wavelength ultraviolet radiation from the UV-LED. The disinfected water is then discharged from the outlet of the main disinfection body, completing the disinfection process.

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