CN116002801A - UVC-LED disinfection device and disinfection method for rear-end water outlet of drinking water equipment - Google Patents
UVC-LED disinfection device and disinfection method for rear-end water outlet of drinking water equipment Download PDFInfo
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Abstract
The invention discloses a UVC-LED disinfection device and a disinfection method for a rear water outlet of drinking water equipment, wherein the device comprises a cold water inlet, a water outlet, a transparent illumination water flow pipe, a water flow sensor, a UVC-LED light source, an LED driving power supply and an LED shell radiator; the two ends of the transparent illumination water flow pipe are respectively connected with the cold and hot water inlet and the water outlet; the water flow sensor is arranged at the joint of the transparent illumination water flow pipe and the cold and hot water inlet; the transparent illumination water flow pipe is also provided with a transparent spiral snakelike inner core pipe. According to the invention, the maximum ultraviolet irradiation dose is selected for sterilization and disinfection, the number of UVC-LED lamp beads and the LED radiation power are calculated according to the maximum ultraviolet irradiation dose, then the electronic circuit arrangement of the UVC-LED light source and the PCB manufacture are carried out, and the ultraviolet irradiation dose of the ultraviolet-LED lamp can be used for sterilizing and killing microorganisms, bacteria or viruses in drinking water, so that the water quality index, the limit and the total colony number of the drinking water accord with the national standard.
Description
Technical Field
The invention relates to the technical field of water purification, in particular to a UVC-LED disinfection device and a disinfection method for a water outlet at the rear end of drinking water equipment.
Background
The related knowledge of viruses in water environment and water treatment process is still in depth, and a plurality of virus concentration, analysis methods and disinfection function devices with high sensitivity and specificity are needed to be established so as to accurately evaluate the survival, migration and removal rules of the viruses in the water environment and water treatment process and develop a high-efficiency drinking water disinfection device. By constructing a multistage barrier technology of drinking water from a source to a tap to a water outlet, the water quality risk of the drinking water caused by viruses can be effectively controlled. UV-LED ultraviolet disinfection is that photons attack microorganism or virus DNA in drinking water, pyrimidine dimers are formed on the chains, and the DNA replication is prevented, so that the microorganism can lose reproductive capacity. The DNA absorption spectrum is in the range of 260-280nm, the absorption peak is 270nm, and the ultraviolet rays in the wave band have a disinfection effect. When UVC ultraviolet rays irradiate microorganisms in drinking water, energy is transferred and accumulated, and the accumulated result causes the inactivation of the microorganisms, so that the aim of disinfection is fulfilled. On the one hand, the ultraviolet rays can mutate the nucleic acid of the bacterial virus, prevent the bacterial virus from replicating, block transcription and synthesize protein; on the other hand, the generation of free radicals may cause photoionization, leading to bacterial death.
The structure of the municipal tap water large-scale industrial direct drinking machine and part of household drinking equipment generally comprises a tap water interface, flows into deep filtration, flows into a water storage barrel, (a few of the water storage barrel comprise) an ultraviolet disinfection device, then flows into a heating device, and finally is provided with a cold water outlet and a hot water outlet. However, in the process of 'from the water storage barrel to the cold and hot water outlet', the drinking water equipment with the structure is polluted by air contact and water pipes, and the pollution of bacteria inevitably exists, so that the total number of bacterial colonies exceeds the standard. The total number of cold water outlet colonies exceeds the standard: according to GB 5749-2006 sanitary Standard for Drinking Water, water quality conventional index and restriction, colony count is less than 100CFU/mL, and total coliform, escherichia coli and heat-resistant coliform cannot be detected. Therefore, an ultraviolet sterilization and disinfection device is required to be additionally arranged at the water outlet, so that the water quality standard at the rearmost end is solved.
The LED ultraviolet sterilization and disinfection effect of drinking water is mainly affected by three aspects: the radiation intensity of the UVC-LED light source, the radiation distance of sterilization and disinfection and the radiation time of ultraviolet light. The intensity of ultraviolet radiation is not constant relative to a particular LED ultraviolet radiation source, and generally the intensity of ultraviolet radiation is inversely proportional to the distance of radiation and directly proportional to the time of radiation. That is, an increase in the radiation distance results in a gradual decrease in the intensity of the ultraviolet radiation; the irradiation time increases, resulting in a gradual increase in the intensity of the ultraviolet radiation. The conventional LED ultraviolet sterilization and disinfection of drinking water does not consider the influence of the linear relationship of the radiation intensity, the radiation distance of sterilization and disinfection, and the radiation time of ultraviolet light on the sterilization and disinfection.
The LED uv sterilization power of drinking water is determined by the uv radiation dose, which is equal to the product of the uv intensity (uW/cm 2) and the irradiation time(s). When the radiation dose of ultraviolet rays is selected, the radiation dose is too high to cause unnecessary waste, and too low to achieve the aim of disinfection. Sterilization and disinfection of drinking water should be focused on killing intestinal bacteria that pass through water-borne diseases, and it is generally considered that the radiation dose required for ultraviolet sterilization of drinking water is not less than 10000uW/cm at minimum 2 。
Problems of the ultraviolet disinfection technology of drinking water are that: (1) light reviving phenomenon: after UV irradiation, the UV damage of the microorganisms can be reversed by visible light, which is called a photo-revitalization phenomenon. Both research and practical applications indicate that as large a dose and intensity as possible should be taken to reduce the negative effects of light revitalization. (2) No persistence capability: since ultraviolet sterilization is a physical form of sterilization, the source of contamination again will be re-contaminated, but if ultraviolet sterilization is continuously maintained, the cost will be prohibitive. (3) The penetration force is low: the ultraviolet irradiation capability is low, the penetrating power is weak, and only microorganisms directly irradiated can be killed. The chromaticity, turbidity, organic matter, ammonia nitrogen and the like of water can seriously influence the disinfection effect of ultraviolet rays, so when an ultraviolet ray disinfection process is designed, the process should be placed at the tail end of treatment as far as possible, and the contact area and time of water and ultraviolet rays are improved by changing the flow rate, optimizing the arrangement of LED ultraviolet light sources and the like, so that the substance to be disinfected is fully exposed to the ultraviolet rays, thereby ensuring the disinfection effect.
Disclosure of Invention
Based on the method, the UVC-LED disinfection device and the disinfection method for the rear water outlet of the drinking water equipment can disinfect and kill microorganisms, bacteria or viruses in drinking water by using UV-LED ultraviolet rays in 100%, and particularly achieve the use effect of being used and killed by aiming at dynamic disinfection and sterilization of microorganisms such as bacteria in flowing water flow, so that the conventional index of water quality and the total number of bacterial colonies meet the national standard.
The aim of the invention is achieved by the following technical scheme:
the invention provides a UVC-LED disinfection device for a rear water outlet of drinking water equipment, which comprises a cold water inlet and a water outlet, and further comprises a transparent illumination water flow pipe, a water flow sensor, a UVC-LED light source, an LED driving power supply and an LED shell radiator; the UVC-LED light source, the LED driving power supply and the LED shell radiator are arranged along the periphery of the transparent illumination water flow pipe; one end of the transparent illumination water flow pipe is connected with the cold and hot water inlets through the water inlet sleeve, and the other end of the transparent illumination water flow pipe is connected with the water outlet through the water outlet sleeve; the water flow sensor is arranged at the joint of the transparent illumination water flow pipe and the cold and hot water inlet; the transparent illumination water flow pipe is also provided with a transparent spiral serpentine inner core pipe.
Further, the UVC-LED light source comprises a PCB board and UV-LED lamp beads arranged on the PCB board.
Further, the UVC-LED light source is an ultraviolet LED light source with the luminous wavelength lambdap=270-280 nm.
Further, the water flow sensor consists of a copper valve body, a water flow rotor assembly, a steady flow assembly and a Hall element, when water flows through the rotor assembly, the rotor rotates, the rotating speed of the rotor changes linearly along with the flow, and the Hall element outputs corresponding pulse signals to be fed back to the LED driving power supply.
Further, the LED driving power supply adopts a PWM dimming mode design, pulse signals of the water flow sensor are transmitted to the LED driving power supply, the LED driving power supply outputs PWM signals through an internal module of a power supply chip, PWM signal output is achieved, and then the illumination dose of the UVC-LED light source is adjusted.
Furthermore, the transparent illumination water flow pipe is made of quartz glass or high borosilicate glass.
Further, the transparent spiral snakelike inner core tube is made of quartz glass or high borosilicate glass.
Secondly, the invention provides a disinfection method using the UVC-LED disinfection device, which comprises the following steps: the drinking water passes through the water inlet, flows through the water flow sensor, the water flow signal is transmitted to the LED driving power supply, the UVC-LED light source is started to start working, the drinking water passes through the spiral snakelike transparent tube, and the UVC-LED light source is used for ultraviolet radiation sterilization of virus and bacteria in the drinking water.
Further, the disinfection method of the present invention further comprises: calculating the time of the water flow passing through the spiral snake-shaped transparent tube according to the maximum design flow rate of the conventional drinking water equipment, and calculating the number of UV-LED lamp beads and the total power of LED radiation in the UVC-LED light source according to the sterilization and disinfection maximum value in the ultraviolet radiation dose of the drinking water, wherein the radiation dose P is calculated O (J/m 2 ) Time of irradiation T(s) ×total power of LED radiation Ps (W/m 2 )。
Further, the calculated number of the UV-LED lamp beads and the total power of the LED radiation in the UVC-LED light source are specifically:
(1) The UVC ultraviolet light passing rate is set to 75%;
(2) Dosage P of ultraviolet radiation in drinking water O Selecting the maximum value for sterilization and disinfection;
(3) Designing water flow height L=H×the curvature of the inner core pipe;
(4) Setting the diameter phi of the water pipe according to the flow Q of the drinking equipment 1 Diameter phi of inner core tube 2 ；
(5) The calculation results are that:
the cross section S of the inner core tube;
obtaining a water flow velocity V according to the hydrodynamics Q=S×V;
time t=l/V;
(6) Total LED radiation power ps=p O T, thereby designing the number of UVC-LED beads to be used.
The invention has the beneficial effects that:
according to the UVC-LED disinfection device, a UVC-LED light source is used for selecting the maximum ultraviolet irradiation dose for disinfection according to viruses, bacteria, saccharomycetes and mildews existing in drinking water, the number of UVC-LED lamp beads and the LED irradiation power are calculated according to the maximum ultraviolet irradiation dose, then the electronic circuit arrangement of the UVC-LED light source and the manufacture of a PCB are carried out, and the sterilization and the disinfection of the effluent at the tail end of drinking water equipment are carried out, so that the conventional index of water quality accords with the national standard. The sterilizing device solves the problems of microbial pollution and bacteria exceeding in drinking water, and particularly achieves the use effect of killing once in use aiming at dynamic sterilization of microorganisms such as bacteria in flowing water flow.
The transparent illumination water flow pipe has the advantages that the inner core pipe is a spiral snake-shaped transparent pipe, the length of the glass pipe is increased, the limited water pipe length is prolonged, the water flow passing time is prolonged, the ultraviolet sterilization radiation time and the sterilization and disinfection effective area are increased, and the sterilization and disinfection effect is improved.
Drawings
FIG. 1 is an exploded view of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 3 is a schematic structural view of a transparent lighting water flow pipe according to an embodiment of the present invention;
fig. 4 is a schematic overall structure of the embodiment of the present invention.
Reference numerals illustrate: 11-cold and hot water inlets, 12-water outlets, 13-transparent illumination water flow pipes, 14-transparent spiral serpentine inner core pipes, 15-water flow sensors, 16-PCB boards, 17-UV-LED lamp beads, 18-LED driving power supplies, 19-LED shell heat dissipation bodies, 20-water inlet sleeves and 21-water outlet sleeves.
Detailed Description
For a further understanding of the present invention, embodiments of the invention are described below in conjunction with specific examples, but it should be understood that these descriptions are merely intended to illustrate further features and advantages of the invention, and are not limiting of the claims of the invention.
As shown in fig. 1, 2, 3 and 4, in this embodiment, a UVC-LED disinfection apparatus for a water outlet at a rear end of a drinking water apparatus includes a cold and hot water inlet 11 and a water outlet 12, and the UVC-LED disinfection apparatus further includes a transparent illumination water flow tube 13, a water flow sensor 15, a UVC-LED light source, an LED driving power source 18 and an LED housing radiator 19; the water flow sensor 15, the UVC-LED light source and the LED driving power supply 18 are electrically connected; the UVC-LED light source, the LED driving power supply 18 and the LED shell radiator 19 are arranged along the periphery of the transparent illumination water flow pipe 13; one end of the transparent illumination water flow pipe 13 is connected with the cold and hot water inlet 11 through the water inlet sleeve 20, and the other end of the transparent illumination water flow pipe 13 is connected with the water outlet 12 through the water outlet sleeve 21; the water flow sensor 15 is arranged at the joint of the transparent illumination water flow pipe 13 and the cold and hot water inlet 11; a transparent spiral serpentine inner core tube 14 is arranged in the transparent illumination water flow tube 13.
In this embodiment, the UVC-LED light source includes a PCB board 16 and UV-LED lamp beads 17 disposed on the PCB board 16, where the UVC-LED light source is an ultraviolet LED light source with a light emission wavelength λp=270-280 nm.
In this embodiment, the water flow sensor 15 mainly comprises a copper valve body, a water flow rotor assembly, a steady flow assembly and a hall element. The water flow sensor 15 is arranged at the joint of the transparent illumination water flow pipe 13 and the cold and hot water inlet 11, namely at the inlet of the water inlet end of the transparent illumination water flow pipe 13, and is used for measuring the water inlet flow. When water flows through the rotor assembly, the rotor rotates, the rotor rotation speed changes linearly along with the flow, the Hall element outputs corresponding pulse signals to feed back to the LED driving power supply 18, the LED driving power supply 18 outputs PWM signals through a power chip internal module, PWM signal output is achieved, and then the illumination dose of the UVC-LED light source is adjusted.
In this embodiment, UVC-LED degassing unit has set up transparent illumination water flow pipe, and the inner core pipe sets up to spiral snakelike transparent pipe, has increased the length of glass pipe, makes limited water pipe length have prolonged the time that rivers passed through to increase ultraviolet ray disinfection's radiation time and disinfection's effective area of disinfecting, increased disinfection's effect.
In this embodiment, the transparent illumination water flow tube 13 is made of quartz glass, and the transparent spiral serpentine inner core tube 14 is made of quartz glass.
In other embodiments, the transparent illumination water flow tube 13 may be made of borosilicate glass, and the transparent spiral serpentine inner core tube 14 may be made of borosilicate glass.
In this embodiment, a sterilization method using a UVC-LED sterilization device includes: calculating the time of the water flow passing through the spiral snake-shaped transparent tube according to the maximum design flow rate of the conventional drinking water equipment, and calculating the number of the UV-LED lamp beads 17 and the total power of LED radiation in the UVC-LED light source according to the sterilization and disinfection maximum value in the ultraviolet radiation dose of the drinking water, wherein the radiation dose P is calculated O (J/m 2 ) Time of irradiation T(s) ×total power of LED radiation Ps (W/m 2 ) The method comprises the steps of carrying out a first treatment on the surface of the The drinking water passes through the water inlet, flows through the water flow sensor 15, the water flow signal is transmitted to the LED driving power supply 18, the UVC-LED light source is started to start working, and the drinking water passes through the spiral snakelike transparent tube, so that the UVC-LED light source performs ultraviolet radiation sterilization on virus and bacteria in the drinking water.
In this embodiment, according to the maximum design flow rate of the conventional drinking water device of 1.5-2.0L/min, the time for the water flow to pass through the spiral serpentine transparent tube is calculated, namely the ultraviolet LED dynamic sterilization and disinfection time of the bacterial microorganisms in the flowing water flow can be considered, and the number of UV-LED lamp beads 17 and the total LED radiation work in the UVC-LED light source are calculated according to the maximum sterilization and disinfection value in the ultraviolet irradiation dose of the drinking water. The number of the UV-LED lamp beads 17 and the total LED radiation power in the UVC-LED light source are calculated, and the method specifically comprises the following steps:
(1) The UVC ultraviolet light passing rate is set to 75%; (comprising 80% light quantum refraction, 92% glass transmittance).
(2) Dosage P of ultraviolet radiation in drinking water O Selecting a maximum valueSterilizing and disinfecting;
for example Salmonella typhimurium 99%/2 LOG/reduction=13200. Mu. Ws/cm2,
P O (Max)＝13200μws/cm2÷0.75＝17600μws/cm2。
(3) Design water flow height l=h (H is transparent illuminating water flow tube 13 length) ×1.5 (inner core tube Guan Qudu) =4 cm×1.5=6 cm.
(4) According to the flow rate Q=1.5L/min=25cm of the drinking equipment 3 S, the diameter phi of the water pipe is set 1 =8mm, inner core tube diameter phi 2 ＝6mm。
(5) The calculation results are that:
inner core tube cross section s=28.26 mm 2 ＝0.2826cm 2 ；
According to the hydrodynamics q=s×v, the water flow velocity v=25++ 0.2826 =88.5 cm/S is obtained;
time t=l/v=6 cm/88.5 cm/s=0.0678 s;
the fluid resistance coefficient is 0.8, the actual T' =time T/0.8=0.085 s.
(6) Total LED radiation power ps=p O T' =17600 +.0.085= 207058 uw=207 mW, thereby yielding the required total optical power of the UVC-LED, i.e. the required UVC-LED radiation optical power is about 207mW, thus designing the use of UVC-LED lamp beads power=40 mW, then six UVC-LED lamp beads are required.
In this embodiment, the transparent spiral serpentine inner core tube 14 is designed and manufactured according to the flow rate, the diameter of the water pipe and the water flow height of the drinking device.
In this embodiment, according to the calculation result of the number of UV-LED beads 17 and the total power of LED radiation in the UVC-LED light source, topology arrangement of the number of UV-LED beads 17 and design and manufacture of electronic circuits of the PCB 16 are performed. The LED light source is an ultraviolet LED light source with the conventional lambdap=270-280 nm.
In this embodiment, the water flow sensor 15 is designed, fabricated, and provided according to a conventional design.
In this embodiment, the LED driving power source 18 is designed, manufactured and provided in PWM dimming mode according to the conventional design.
The UVC-LED disinfection device and the disinfection method can disinfect and kill microorganisms, bacteria or viruses in drinking water by using the ultraviolet light of the UV-LED in 100%, and especially achieve the use effect of immediate use and immediate killing aiming at the dynamic disinfection and sterilization of microorganisms such as bacteria in flowing water flow, so that the conventional index of water quality and the total number of bacterial colonies accord with the national standard.
Those skilled in the art can also make appropriate changes and modifications to the above-described embodiments in light of the above disclosure. Therefore, the invention is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the invention should be also included in the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (10)
1. A UVC-LED degassing unit for drinking water equipment rear end delivery port contains cold and hot water inlet and delivery port, its characterized in that: the UVC-LED disinfection device further comprises a transparent illumination water flow pipe, a water flow sensor, a UVC-LED light source, an LED driving power supply and an LED shell radiator; the UVC-LED light source, the LED driving power supply and the LED shell radiator are arranged along the periphery of the transparent illumination water flow pipe; one end of the transparent illumination water flow pipe is connected with the cold and hot water inlets through the water inlet sleeve, and the other end of the transparent illumination water flow pipe is connected with the water outlet through the water outlet sleeve; the water flow sensor is arranged at the joint of the transparent illumination water flow pipe and the cold and hot water inlet; and a transparent spiral serpentine inner core tube is arranged in the transparent illumination water flow tube.
2. UVC-LED disinfection apparatus for a back-end outlet of a potable water plant according to claim 1, characterized by: the UVC-LED light source comprises a PCB and UV-LED lamp beads arranged on the PCB.
3. UVC-LED disinfection apparatus for a back-end outlet of a potable water device according to claim 2, characterized by: the UVC-LED light source is an ultraviolet LED light source with the luminous wavelength lambdap=270-280 nm.
4. UVC-LED disinfection apparatus for a back-end outlet of a potable water plant according to claim 1, characterized by: the water flow sensor consists of a copper valve body, a water flow rotor assembly, a steady flow assembly and a Hall element, when water flows through the rotor assembly, the rotor rotates, the rotating speed of the rotor changes linearly along with the flow, and the Hall element outputs corresponding pulse signals to be fed back to the LED driving power supply.
5. The UVC-LED disinfection apparatus for a back-end outlet of a potable water facility of claim 4, wherein: the LED driving power supply adopts a PWM dimming mode design, pulse signals of the water flow sensor are transmitted to the LED driving power supply, and the LED driving power supply outputs PWM signals through an internal module of a power chip so as to adjust the illumination dose of the UVC-LED light source.
6. UVC-LED disinfection apparatus for a back-end outlet of a potable water plant according to claim 1, characterized by: the transparent illumination water flow pipe is made of quartz glass or high borosilicate glass.
7. UVC-LED disinfection apparatus for a back-end outlet of a potable water plant according to claim 1, characterized by: the transparent spiral snakelike inner core tube is made of quartz glass or high borosilicate glass.
8. A method of disinfection of a UVC-LED disinfection device for a back end outlet of a drinking water apparatus according to any one of claims 1 to 7, characterized in that: the drinking water passes through the water inlet, flows through the water flow sensor, the water flow signal is transmitted to the LED driving power supply, the UVC-LED light source is started to start working, the drinking water passes through the spiral snakelike transparent tube, and the UVC-LED light source is used for ultraviolet radiation sterilization of virus and bacteria in the drinking water.
9. The disinfection method of a UVC-LED disinfection device for a rear water outlet of a drinking water equipment as claimed in claim 8,the method is characterized in that: the method also comprises the step of calculating the time of the water flow passing through the spiral snake-shaped transparent pipe according to the maximum design flow rate of the conventional drinking water equipment; calculating the number of UV-LED lamp beads in the UVC-LED light source and the total power of LED radiation according to the maximum sterilization and disinfection value in the ultraviolet radiation dose of the drinking water, wherein the radiation dose P is the total power of the LED radiation O Time of illumination T x total power of LED radiation Ps.
10. The method of disinfecting a UVC-LED disinfection apparatus for a back-end outlet of a potable water device of claim 9, characterized by: the calculated number of the UV-LED lamp beads and the total LED radiation power in the UVC-LED light source are specifically as follows:
(1) The UVC ultraviolet light passing rate is set to 75%;
(2) Dosage P of ultraviolet radiation in drinking water O Selecting the maximum value for sterilization and disinfection;
(3) Designing water flow height L=H×the curvature of the inner core pipe;
(4) Setting the diameter phi of the water pipe according to the flow Q of the drinking equipment 1 Diameter phi of inner core tube 2 ；
(5) The calculation results are that:
the cross section S of the inner core tube;
obtaining a water flow velocity V according to the hydrodynamics Q=S×V;
time t=l/V;
(6) Total LED radiation power ps=p O T, thereby designing the number of UVC-LED beads to be used.
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| CN202211624415.7A Pending CN116002801A (en) | 2022-12-16 | 2022-12-16 | UVC-LED disinfection device and disinfection method for rear-end water outlet of drinking water equipment |
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