A pure water ultrapure water making system based on mercury-free ultraviolet lamp

Abstract

This invention belongs to the field of water treatment and discloses a pure water and ultrapure water production system based on mercury-free ultraviolet lamps. The system includes a raw water tank, a pretreatment unit, a primary filtration unit, a first reverse osmosis unit, a second reverse osmosis unit, an EDI unit, an ultraviolet sterilization unit, a pure water unit, a cleaning unit, and a control unit. This technical solution allows water to flow in a serpentine pattern along multiple sets of flow tubes, ensuring sufficient ultraviolet sterilization time while reducing the size and space occupied by the ultraviolet sterilization device. It can change the flow direction of water within the corresponding flow tubes, thus allowing for the interception of the corresponding flow tube when a mercury-free ultraviolet lamp is damaged, enabling uninterrupted replacement of the mercury-free ultraviolet lamp. The damaged mercury-free ultraviolet lamp is temporarily replaced by a mercury-free ultraviolet lamp in a compensation tube for sterilization, ensuring that the water flow still achieves sufficient sterilization time even when one set of mercury-free ultraviolet lamps is damaged, without requiring adjustment of the fluid flow rate, thereby improving sterilization accuracy.

Description

Technical Field

[0001] This invention relates to the field of water treatment, and more particularly to a pure water and ultrapure water production system based on a mercury-free ultraviolet lamp. Background Technology

[0002] Ultrapure water is now widely used in fields such as biology, medicine, and automobiles. This type of water contains almost no impurities besides water molecules, and is free of bacteria, viruses, dioxins, and other organic matter. It also lacks essential minerals and trace elements. Ultrapure water has no hardness, a sweet taste, and is often referred to as soft water. It can be drunk directly or after boiling. A typical ultrapure water system produces ultrapure water through multiple filtration processes, including ion exchange, degassing, reverse osmosis, ultraviolet light, ultrafiltration, nanofiltration, and ion adsorption filtration. Ultraviolet sterilization devices are used to treat the ultrapure water, typically employing two methods: flow-through and immersion.

[0003] Immersion UV germicidal lamps are placed directly in water, but this method poses a safety hazard as the lamps may break unexpectedly. Flow-through UV germicidal lamps work by using a pump to pressurize water at a certain flow rate, allowing it to pass through a quartz tube that transmits UV light. The 254nm UV light from the lamp disinfects the water. During sterilization, the water flows through the glass tube outside the UV lamp. Because the water is constantly flowing, it moves quickly through the tube. To achieve better sterilization, longer UV lamps are typically used, or multiple lamps are combined to create a longer flow channel to extend the water flow time. This results in a longer UV lamp channel, increasing the system's size and space requirements, making system layout difficult, and hindering the replacement of damaged lamps without shutting down the system. Furthermore, if a lamp malfunctions, insufficient sterilization time can lead to substandard sterilization quality. Summary of the Invention

[0004] The present invention aims to provide a pure water and ultrapure water production system based on mercury-free ultraviolet lamps to solve the aforementioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A pure water and ultrapure water production system based on a mercury-free ultraviolet lamp includes,

[0007] Raw water tank, which is used to store raw water to be treated;

[0008] A pretreatment unit, which is connected to the raw water tank, is used to pretreat the raw water;

[0009] The primary filtration unit is connected to the pretreatment unit and performs preliminary filtration on the raw water.

[0010] The first reverse osmosis unit is connected to the primary filtration unit and performs precision filtration on the raw water.

[0011] The second reverse osmosis unit is connected to the first reverse osmosis unit, and the second reverse osmosis unit performs a second precision filtration of the water.

[0012] The EDI unit is connected to the second reverse osmosis unit and is used to remove positive and negative ions from the water.

[0013] The ultraviolet sterilization unit includes a main flow tube, a flow pipe, a differential tube, and a mercury-free ultraviolet lamp 37. The flow pipe is connected to a glass cover and has a mounting groove. The mercury-free ultraviolet lamp is slidably connected to the mounting groove and is connected to a mounting plate. The mounting plate is detachably connected to the flow tube. An inlet pipe and an outlet pipe are connected to both ends of the flow tube. Two sets of main flow tubes are provided, and any one of the main flow tubes is connected to an EDI unit. The inlet pipe and outlet pipe are detachably connected to the two sets of main flow tubes, respectively. A first switch is connected to the main flow pipe near the inlet pipe, a second switch is connected to the main flow pipe near the outlet pipe, and a third switch is connected to the main flow pipe. The first, second, and third switches cooperate with the flow pipes. The flow pipes are provided in several groups. Two groups of the main flow pipes are connected to a first outlet pipe. Each main flow pipe is connected to a one-way valve. The first outlet pipe is connected to a diverter pipe, and the diverter pipe is connected to a control valve. The differential pipe has the same structure as the flow pipe. The diverter pipe is connected to the differential pipe, and the differential pipe is connected to a second outlet pipe.

[0014] A pure water unit, wherein the pure water unit comprises a pure water collection tank, and the first and second outlet pipes are respectively connected to the pure water collection tank;

[0015] A cleaning unit, wherein the cleaning unit is used to clean the first reverse osmosis unit;

[0016] A control unit, which is used to control system pathways.

[0017] Preferably, the pretreatment unit includes a mixing tank and a dosing tank. The mixing tank is connected to a servo motor, and the output shaft of the servo motor is connected to a mixing shaft. The mixing tank is connected to a first mixing tube, a second mixing tube, and a dosing mixing tube. The first mixing tube is connected to the raw water tank, and the second mixing tube is connected to the primary filtration unit. The dosing tank is connected to a dosing pump, and the dosing mixing tube is connected to the dosing pump. The first and second mixing tubes are respectively connected to flow detectors.

[0018] Preferably, the primary filtration unit includes an aeration tank, an iron and manganese removal filter, a quartz sand filter, and an activated carbon filter. The second stirring tube is connected to the aeration tank, and the aeration tank, the iron and manganese removal filter, the quartz sand filter, and the activated carbon filter are connected in sequence through pipes.

[0019] Preferably, the first reverse osmosis unit includes a precision filter, a first reverse osmosis (RO) membrane module, and a first high-pressure pump. The precision filter is connected to an activated carbon filter and the first high-pressure pump. The first RO membrane module is connected to a reverse osmosis inlet pipe, a reverse osmosis outlet pipe, and a first concentrate outlet pipe. The reverse osmosis inlet pipe is connected to the first high-pressure pump, and the reverse osmosis outlet pipe is connected to the inlet end of the second reverse osmosis unit.

[0020] Preferably, the second reverse osmosis unit includes a second reverse osmosis (RO) membrane module, an intermediate tank, a pH adjustment tank, and a second high-pressure pump. The reverse osmosis drain pipe is connected to the intermediate tank. The second RO membrane module is connected to the intermediate tank via the second high-pressure pump and a pipeline. The second RO membrane module is connected to a second concentrate discharge pipe, which is connected to the raw water tank. The pure water outlet of the second RO membrane module is connected to an EDI unit. The EDI unit is connected to an ultraviolet (UV) inlet pipe, which is connected to any of the main flow pipes.

[0021] Preferably, the cleaning unit includes a reagent tank and a cleaning filter tank, the reagent tank and the cleaning filter tank are connected, the cleaning filter tank is connected to a forward cleaning pipe, the forward cleaning pipe is connected to a reverse osmosis inlet pipe, the forward cleaning pipe is connected to a reverse cleaning pipe, the reverse cleaning pipe is connected to a first concentrate discharge pipe, and the pure water collection tank is connected to the reagent tank.

[0022] Preferably, the ultraviolet inlet pipe is connected to a conductivity detector, the ultraviolet inlet pipe is connected to an outlet pipe, and the outlet pipe is connected to the second concentrate outlet pipe.

[0023] Preferably, the pure water collection tank is connected to a liquid level sensor, and the pure water collection tank is provided with several sets of sensors. The pure water collection tank is connected to the raw water tank.

[0024] The beneficial effects of this technical solution compared to existing technologies are as follows:

[0025] (1) This technical solution uses mercury-free ultraviolet lamps to complete sterilization, avoiding the situation where toxic substances inside the ultraviolet lamps diffuse into the water and cause safety hazards when the ultraviolet lamps break. This application uses two sets of flow tubes to set multiple sets of flow tubes from top to bottom. Mercury-free ultraviolet lamps are set in the flow tubes, and the water flows in a serpentine manner along the multiple sets of flow tubes. This ensures the ultraviolet sterilization time while reducing the volume and space occupied by the ultraviolet sterilization device, making it easier to assemble the preparation system and greatly improving the applicability of the system. The flow direction of the water in the corresponding flow tube can be changed by the cooperation of the first switch, the second switch and the third switch. Then, when the mercury-free ultraviolet lamp is damaged, the corresponding flow tube can be cut off, so that the mercury-free ultraviolet lamp can be replaced without stopping the machine. At the same time, a compensation tube is set up to temporarily replace the damaged mercury-free ultraviolet lamp with the mercury-free ultraviolet lamp in the compensation tube for sterilization. This ensures that the water flow can still achieve sufficient sterilization time when one set of mercury-free ultraviolet lamps is damaged, and there is no need to adjust the fluid flow rate, thus improving the sterilization accuracy.

[0026] (2) This technical solution is equipped with a cleaning unit, which can perform forward and backwashing on the first reverse osmosis unit to improve the cleaning effect of the system and ensure water production efficiency and quality. The pure water collection tank is equipped with a liquid level sensor, and there are multiple sets of pure water collection tanks. The liquid level sensor can monitor the storage time of pure water and ultrapure water in the pure water collection tank in real time. When the storage time exceeds the set value, the ultrapure water is sent back to the raw water tank for further purification to avoid the long-term storage of ultrapure water in the pure water collection tank, which will cause bacteria to grow again and cause pollution. This improves the stability of the system. The pure water collection tank is connected to the chemical tank, and the cleaning agent can be provided to the cleaning unit through the pure water collection tank to improve the cleaning effect, reduce the clogging of the first reverse osmosis RO membrane module during the cleaning process, and improve the cleaning effect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the process of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the ultraviolet sterilization unit provided by the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the preprocessing unit provided by the present invention;

[0030] Figure 4 A schematic diagram of the pure water collection tank provided by the present invention;

[0031] Figure labels: 1. Raw water tank; 2. Mixing tank; 3. Chemical dosing tank; 4. Aeration tank; 5. Iron and manganese removal filter; 6. Quartz sand filter; 7. Activated carbon filter; 8. Precision filter; 9. First high-pressure pump; 10. First reverse osmosis unit; 11. Reverse osmosis inlet pipe; 12. First reverse osmosis RO membrane module; 13. Reverse osmosis drain pipe; 14. First concentrate discharge pipe; 15. Reverse cleaning pipe; 16. Forward cleaning pipe; 17. Chemical tank; 18. Cleaning filter box; 19. Intermediate tank; 20. pH adjustment tank; 21. Second high-pressure pump; 22. Second reverse osmosis unit; 23. Second reverse osmosis RO membrane module; 24. EDI unit; 25. Conductivity detector; 26. Discharge pipe. 26. UV inlet pipe; 27. UV sterilization unit; 28. Diverter pipe; 29. ​​First outlet pipe; 30. Second outlet pipe; 31. Pure water collection tank; 32. Control unit; 33. Second concentrate discharge pipe; 34. Flow pipe; 35. Glass cover; 36. Mercury-free UV lamp; 37. Mounting slot; 38. Mounting plate; 39. Inlet pipe; 40. Drain pipe; 41. Main flow pipe; 42. First switch; 43. Second switch; 44. Third switch; 45. One-way valve; 46. Differential compensation pipe; 47. Stirring shaft; 49. First stirring pipe; 50. Second stirring pipe; 51. Dosing stirring pipe; 52. Flow detector; 53. Servo motor; 54. Dosing pump; 55. Liquid level sensor; 56. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0033] like Figures 1 to 4 The illustrated pure water and ultrapure water production system based on a mercury-free ultraviolet lamp 37 includes,

[0034] Raw water tank 1 is used to store raw water to be treated.

[0035] The pretreatment unit is connected to the raw water tank 1 and is used to pretreat the raw water.

[0036] The primary filtration unit is connected to the pretreatment unit and performs preliminary filtration on the raw water.

[0037] The first reverse osmosis unit 10 is connected to the primary filtration unit and performs precision filtration on the raw water.

[0038] The second reverse osmosis unit 22 is connected to the first reverse osmosis unit 10, and the second reverse osmosis unit 22 performs a second precision filtration of the water.

[0039] EDI unit 24 is connected to the second reverse osmosis unit 22. EDI unit 24 is used to remove positive and negative ions from the water.

[0040] The ultraviolet sterilization unit 28 includes a main flow pipe 42, a flow tube 35, a differential tube 47, and a mercury-free ultraviolet lamp 3737. The flow tube 35 is connected to a glass cover 36 and has a mounting groove 38. The mercury-free ultraviolet lamp 37 is slidably connected to the mounting groove 38 and is connected to a mounting plate 39. The mounting plate 39 is detachably connected to the flow tube 35 by bolts. The two ends of the flow tube 35 are respectively connected to an inlet pipe 40 and a drain pipe 41. There are two sets of main flow pipes 42, one of which is connected to the EDI unit 24, serving as a conduit for liquid to enter the ultraviolet sterilization unit 28. The inlet pipe 40 and the drain pipe 41 are detachably connected to the two sets of main flow pipes 42 by bolts. The inlet pipe 40 is connected to a first switch 43. A second switch 44 is connected to the main flow pipe 42 on the side near the inlet pipe 40, and a third switch 45 is connected to the main flow pipe 42 on the side near the outlet pipe 41. The first switch 43, the second switch 44, and the third switch 45 cooperate with the flow pipe 35, that is, one set of flow pipe 35 works in conjunction with three switches. There are several sets of flow pipe 35. Two sets of flow pipe 42 are connected to the first outlet pipe 30. The main flow pipe 42 is connected to a one-way valve 46. The first outlet pipe 30 is connected to a diversion pipe 29. The diversion pipe 29 is connected to a switch valve. The differential pipe 47 has the same structure as the flow pipe 35. The diversion pipe 29 is connected to the differential pipe 47. The differential pipe 47 is connected to the second outlet pipe 31. The first outlet pipe 30 and the second outlet pipe 31 are respectively connected to the pure water collection tank 32.

[0041] The following is Figure 2 To further describe the UV sterilization unit 28, such as Figure 2 As shown, the flow tubes 35 are provided in three sets, arranged sequentially from bottom to top along the two sets of main flow tubes 42. The mercury-free ultraviolet lamp 37 passes through the mounting groove 38 into the inside of the glass cover 36 and is detachably connected to the flow tubes 35 via the mounting plate 39. The three sets of flow tubes 35 are arranged in an alternating pattern from bottom to top, that is, the inlet pipe 40 of the lowest flow tube 35 is located to its left, the inlet pipe 40 of the middle flow tube 35 is located to its right, and the inlet pipe 40 of the highest flow tube 35 is located to its left, so that water can flow in a serpentine manner along the multiple sets of flow tubes 35. A second switch 44 is connected to the main flow tube 42 on the side of the corresponding flow tube 35 with respect to the inlet pipe 40. Figure 2As shown, the second switch 44 has three sets corresponding to the three sets of flow tubes 35. Simultaneously, all three sets of second switches 44 are located on the side of the three sets of flow tubes 35 where the first switch 43 is located. When the mercury-free ultraviolet lamp 37 in the flow tube 35 is in normal use, the switch valve on the diverter 29 is closed, the first switch 43 is open, the second switch 44 is closed, and the third switch 45 is open. All the first switches 43, second switches 44, and switches corresponding to all flow tubes 35 follow this control method; that is, when the first switch 43 is open, all first switches 43 are open, and all... With the second switch 44 closed and the third switch 45 open, water flows from the left main flow pipe 42 into the lowest flow pipe 35, flows from left to right along the lowest flow pipe 35 into the middle flow pipe 35, flows from right to left along the middle flow pipe 35 into the upper flow pipe 35, flows from left to right along the upper flow pipe 35, and then flows along the right main flow pipe 42 and the first outlet pipe 30 into the pure water tank, followed by ultraviolet sterilization. The control unit 33 can control the opening and closing of the mercury-free ultraviolet lamp 37 and detect the working status of the mercury-free ultraviolet lamp 37.

[0042] When one of the mercury-free UV lamps 37 fails, Figure 2 Taking the damage to the mercury-free UV lamp 37 in the middle flow tube 35 as an example, the control unit 33 detects the damage to the mercury-free UV lamp 37 and then controls the first switch 43, which is associated with the middle flow tube 35, to close, the second switch 44 to open, and the third switch 45 to close. At the same time, the second switch 44 corresponding to the upper flow tube 35 opens and the third switch 45 closes. When there are multiple sets of flow tubes 35, the second switch 44 and the third switch 45 corresponding to the upper side of the damaged flow tube 35 are changed to the opposite state from the original state. The second switch 44, which was originally open, is now closed. At the same time, the switch valve on the diversion tube 29 is opened and the switch valve on the first outlet tube 30 is closed. At this time, the third switch 45 on the uppermost side of the right side is already closed, so the water flows along the lowermost flow tube 35. After flowing from left to right into the right-side main branch pipe, it directly enters the right end of the upper flow pipe 35 along the right-side main flow pipe 42, and then flows from right to left along the uppermost flow pipe 35 for sterilization. Then it enters the first outlet pipe 30 along the left-side main flow pipe 42, then enters the branch pipe 29, then enters the compensation pipe 47 to replenish the UV sterilization time, and then flows into the pure water collection tank 32 along the second outlet pipe 31. This process can be used to repair the mercury-free UV lamp 37 in the damaged branch pipe 29. After the repair is completed, the use of the compensation pipe 47 can be stopped, and the UV sterilization unit 28 can work in its original state. The mercury-free UV lamp 37 can be disassembled without stopping the machine by controlling the opening and closing of the corresponding first switch 43, second switch 44, third switch 45 and switch valve through the control unit 33.

[0043] The pure water unit includes a pure water collection tank 32. The first outlet pipe 30 and the second outlet pipe 31 are respectively connected to the pure water collection tank 32. A liquid level sensor 56 is connected to the bottom of the pure water collection tank 32. The liquid level sensor 56 can monitor the amount of ultrapure water in the pure water collection tank 32 and the storage time of ultrapure water in real time. If the liquid level drops to 0, it means that there is no ultrapure water in the ultrapure water collection tank. The storage time of ultrapure water can then be counted. The pure water collection tank 32 is provided with two sets of outlets. The first outlet pipe 30 and the second outlet pipe 31 are each provided with two sets of outlets, which are respectively connected to the two sets of pure water collection tanks 32. The pure water collection tank 32 is connected to the raw water tank 1.

[0044] A cleaning unit is used to clean the first reverse osmosis unit 10.

[0045] Control unit 33 is used to control the system path.

[0046] The pretreatment unit includes a mixing tank 2 and a dosing tank 3. The mixing tank 2 is connected to a servo motor 54, and the output shaft of the servo motor 54 is connected to a stirring shaft 49. The stirring shaft 49 is located inside the mixing tank 2. The mixing tank 2 is connected to a first stirring pipe 50, a second stirring pipe 51, and a dosing stirring pipe 52. The first stirring pipe 50 is connected to the raw water tank 1, and the second stirring pipe 51 is connected to the primary filtration unit. The dosing tank 3 is connected to a dosing pump 55, and the dosing stirring pipe 52 is connected to the dosing pump 55. The first stirring pipe 50 and the second stirring pipe 51 are respectively connected to flow detectors 53. The flow detectors 53 can detect the amount of raw water entering the mixing tank 2, thereby facilitating the control of the dosing speed and dosage.

[0047] The primary filtration unit includes an aeration tank 4, an iron and manganese removal filter 5, a quartz sand filter 6, and an activated carbon filter 7. The second stirring pipe 51 is connected to the aeration tank 4, and the aeration tank 4, the iron and manganese removal filter 5, the quartz sand filter 6, and the activated carbon filter 7 are connected in sequence through pipes.

[0048] The first reverse osmosis unit 10 includes a precision filter 8, a first reverse osmosis (RO) membrane module 12, and a first high-pressure pump 9. The precision filter 8 is connected to the activated carbon filter 7 and the first high-pressure pump 9. There is also a transition box between the precision filter and the first high-pressure pump 9. The transition box is used to store intermediate water. The first reverse osmosis (RO) membrane module 12 is connected to a reverse osmosis inlet pipe 11, a reverse osmosis outlet pipe 13, and a first concentrate outlet pipe 14. The first concentrate outlet pipe 14 is connected to a drain outlet. The reverse osmosis inlet pipe 11 is connected to the first high-pressure pump 9, and the reverse osmosis outlet pipe 13 is connected to the inlet of the second reverse osmosis unit 22.

[0049] The second reverse osmosis unit 22 includes a second reverse osmosis RO membrane module 23, an intermediate tank 19, a pH adjustment tank 20, and a second high-pressure pump 21. The pH adjustment tank 20 is connected to the intermediate tank 19, and the second high-pressure pump 21 is connected to the pH adjustment tank 20. The reverse osmosis drain pipe 13 is connected to the intermediate tank 19. The second reverse osmosis RO membrane module 23 is connected to the intermediate tank 19 through the second high-pressure pump 21 and a pipeline. The second reverse osmosis RO membrane module 23 is connected to a second concentrate discharge pipe 34, which is connected to the raw water tank 1. The pure water outlet of the second reverse osmosis RO membrane module 23 is connected to the EDI unit 24. The EDI unit 24 is connected to an ultraviolet inlet pipe 27, which is connected to any flow main pipe 42. The ultraviolet inlet pipe 27 is connected to a conductivity detector 25 and a discharge pipe 26, which is connected to the second concentrate discharge pipe 34.

[0050] The cleaning unit includes a reagent tank 17 and a cleaning filter box 18, which are connected. The cleaning filter box 18 is connected to a forward cleaning pipe 16, which is connected to a reverse osmosis inlet pipe 11. The forward cleaning pipe 16 is connected to a reverse cleaning pipe 15, which is connected to a first concentrate discharge pipe 14. The pure water collection tank 32 is connected to the reagent tank 17.

[0051] Furthermore, all connections described in this application are made through pipelines, and each pipeline is equipped with a switch valve, the opening and closing of which is accomplished by the control unit 33; the flow of water in this application is powered by a pump, which is hereby stated.

[0052] The specific implementation process is as follows:

[0053] The raw water to be treated is stored in the raw water tank 1. A water pump then pumps the raw water into the mixing tank 2. A flow detector 53 detects the amount of raw water entering the mixing tank 2. A dosing pump 55 then injects the corresponding amount of treatment agent into the mixing tank 2. A servo motor 54 drives the mixing shaft 49 to rotate, ensuring thorough mixing of the agent and raw water. The water then enters the aeration tank 4. After aeration and oxidation in the aeration tank 4, the water sequentially enters the iron and manganese removal filter 5, the quartz sand filter 6, and the activated carbon filter 7 for preliminary treatment. It then enters the tight filter for further filtration, and finally enters the transition tank. Under the action of the first high-pressure pump 9, the water is sent from the reverse osmosis inlet pipe 11 into the first reverse osmosis (RO) membrane module 12 for separation. The resulting desalinated water is discharged into the intermediate tank 19 along the reverse osmosis drain pipe 13, while the concentrated water is discharged along the first concentrated water outlet pipe 14. The desalinated water then flows into the pH adjustment tank 20 after entering the intermediate tank 19. The pH value of the fresh water is adjusted by adding sodium hydroxide in the pH adjustment tank 20 to improve the filtration effect of the fresh water in the second reverse osmosis (RO) membrane module 23. After the fresh water is adjusted in the pH adjustment tank 20, the second high-pressure pump 21 inputs the fresh water into the second RO membrane module 23 for separation. The resulting pure water enters the EDI unit 24 for positive and negative ion separation to reduce the water conductivity. The concentrated water flows into the raw water tank 1 along the second concentrated water discharge pipe 34 for further treatment. After the water passes through the EDI unit 24 to separate positive and negative ions, it is discharged from the ultraviolet inlet pipe 27. The conductivity of the water source is detected by the conductivity detector 25. Water that does not meet the standard is discharged into the second concentrated water discharge pipe 34 along the discharge pipe 26 and then enters the raw water tank 1 for further treatment. Water that meets the standard detected by the conductivity detector 25 enters the flow main pipe 42 from the ultraviolet inlet pipe 27. After ultraviolet sterilization is completed in the above manner, it flows into the pure water collection tank 32.

[0054] The level sensor 56 is electrically connected to the control unit 33, which consists of a central controller, etc. The level sensor 56 detects the storage time of ultrapure water in the pure water collection tank 32 and sets a pure water storage threshold. If the specified time is reached, the pure water is discharged into the raw water tank 1 for recirculation. When the first reverse osmosis unit 10 needs cleaning, chemicals and cleaning water are added to the chemical tank 17. The cleaning water can be the pure water in the pure water collection tank 32 or externally added water. When the pure water storage time in the pure water collection tank 32 is close to the set pure water storage threshold, the pure water in the pure water collection tank 32 can be used, and the switch valve of the split osmosis drain pipe is closed. The chemical tank 17... The cleaning agent enters the cleaning filter box 18, and after filtration, it enters the reverse osmosis feed water pipe 11 along the forward cleaning pipe 16, and then enters the first reverse osmosis RO membrane module 12 for cleaning. It is then discharged from the first concentrate discharge pipe 14. During this process, the cleaning solution can remain still in the first reverse osmosis RO membrane module 12 for forty minutes and then flow to clean again. After the forward cleaning is completed, the cleaning solution flows along the reverse cleaning pipe 15, and the cleaning solution enters the first reverse osmosis RO membrane module 12 along the first concentrate discharge pipe 14 for cleaning. A sewage discharge pipe is connected to the reverse osmosis feed water pipe 11, and the sewage flows from the reverse osmosis feed water pipe 11 into the sewage discharge pipe for discharge. The comprehensive cleaning is completed through the liquid flow in two directions.

[0055] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A pure water and ultrapure water production system based on a mercury-free ultraviolet lamp, characterized in that: include, Raw water tank (1), the raw water tank (1) is used to store raw water to be treated; A pretreatment unit is connected to the raw water tank (1) and is used to pretreat the raw water. The primary filtration unit is connected to the pretreatment unit and performs preliminary filtration on the raw water. The first reverse osmosis unit (10) is connected to the primary filtration unit and performs precision filtration on the raw water. The second reverse osmosis unit (22) is connected to the first reverse osmosis unit (10), and the second reverse osmosis unit (22) performs a second precision filtration on the water; EDI unit (24), which is connected to the second reverse osmosis unit (22), is used to remove positive and negative ions from the water; The ultraviolet sterilization unit (28) includes a main flow tube (42), a flow pipe (35), a differential tube (47), and a mercury-free ultraviolet lamp (37). The flow pipe (35) is connected to a glass cover (36). The flow pipe (35) is provided with a mounting groove (38). The mercury-free ultraviolet lamp (37) is slidably connected to the mounting groove (38). The mercury-free ultraviolet lamp (37) is connected to a mounting plate (39). The mounting plate (39) is detachably connected to the flow pipe (35). The flow pipe (35) is provided with at least three sets. Each set of the flow pipe (35) is connected to an inlet pipe (40) and a drain pipe (41) at both ends. The main flow tube (42) is provided with two sets. Any one of the main flow tubes (42) is connected to the EDI unit (24). The inlet pipe (40) and the drain pipe (41) are detachably connected to the two sets of main flow tubes (42) respectively. The inlet pipe (40) is connected to a first switch (43), the main flow pipe (42) near the inlet pipe (40) is connected to a second switch (44), and the main flow pipe (42) near the outlet pipe (41) is connected to a third switch (45). The first switch (43), the second switch (44), and the third switch (45) cooperate with the flow pipe (35). Each set of flow pipes (35) works in conjunction with three switches. The two sets of flow pipes (42) are connected to a first outlet pipe (30). The main flow pipes (42) are respectively connected to a one-way valve (46). The first outlet pipe (30) is connected to a diversion pipe (29). The diversion pipe (29) is connected to a control valve. The compensation pipe (47) has the same structure as the flow pipe (35). The diversion pipe (29) is connected to the compensation pipe (47). The compensation pipe (47) is connected to a second outlet pipe (31). A pure water unit, the pure water unit includes a pure water collection tank (32), and the first outlet pipe (30) and the second outlet pipe (31) are respectively connected to the pure water collection tank (32); A cleaning unit is used to clean the first reverse osmosis unit (10). Control unit (33) is used to control system pathways.

2. The pure water and ultrapure water production system based on a mercury-free ultraviolet lamp as described in claim 1, characterized in that: The pretreatment unit includes a mixing tank (2) and a dosing tank (3). The mixing tank (2) is connected to a servo motor (54). The output shaft of the servo motor (54) is connected to a mixing shaft (49). The mixing tank (2) is connected to a first mixing pipe (50), a second mixing pipe (51), and a dosing mixing pipe (52). The first mixing pipe (50) is connected to the raw water tank (1). The second mixing pipe (51) is connected to the primary filtration unit. The dosing tank (3) is connected to a dosing pump (55). The dosing mixing pipe (52) is connected to the dosing pump (55). The first mixing pipe (50) and the second mixing pipe (51) are respectively connected to flow detectors (53).

3. The pure water and ultrapure water production system based on a mercury-free ultraviolet lamp as described in claim 2, characterized in that: The primary filtration unit includes an aeration tank (4), an iron and manganese removal filter (5), a quartz sand filter (6), and an activated carbon filter (7). The second stirring tube (51) is connected to the aeration tank (4). The aeration tank (4), the iron and manganese removal filter (5), the quartz sand filter (6), and the activated carbon filter (7) are connected in sequence through pipes.

4. A pure water and ultrapure water production system based on a mercury-free ultraviolet lamp as described in claim 3, characterized in that: The first reverse osmosis unit (10) includes a precision filter (8), a first reverse osmosis RO membrane module (12) and a first high-pressure pump (9). The precision filter (8) is connected to an activated carbon filter (7) and the first high-pressure pump (9). The first reverse osmosis RO membrane module (12) is connected to a reverse osmosis inlet pipe (11), a reverse osmosis outlet pipe (13) and a first concentrate outlet pipe (14). The reverse osmosis inlet pipe (11) is connected to the first high-pressure pump (9), and the reverse osmosis outlet pipe (13) is connected to the inlet end of the second reverse osmosis unit (22).

5. A pure water and ultrapure water production system based on a mercury-free ultraviolet lamp as described in claim 4, characterized in that: The second reverse osmosis unit (22) includes a second reverse osmosis RO membrane module (23), an intermediate tank (19), a pH adjustment tank (20), and a second high-pressure pump (21). The reverse osmosis drain pipe (13) is connected to the intermediate tank (19). The second reverse osmosis RO membrane module (23) and the intermediate tank (19) are connected through the second high-pressure pump (21) and a pipeline. The second reverse osmosis RO membrane module (23) is connected to a second concentrate discharge pipe (34). The second concentrate discharge pipe (34) is connected to the raw water tank (1). The pure water outlet of the second reverse osmosis RO membrane module (23) is connected to the EDI unit (24). The EDI unit (24) is connected to an ultraviolet inlet pipe (27). The ultraviolet inlet pipe (27) is connected to any of the flow main pipes (42).

6. A pure water and ultrapure water production system based on a mercury-free ultraviolet lamp as described in claim 4, characterized in that: The cleaning unit includes a reagent tank (17) and a cleaning filter tank (18), which are connected. The cleaning filter tank (18) is connected to a forward cleaning pipe (16), which is connected to a reverse osmosis inlet pipe (11). The forward cleaning pipe (16) is connected to a reverse cleaning pipe (15), which is connected to a first concentrate discharge pipe (14). The pure water collection tank (32) is connected to the reagent tank (17).

7. A pure water and ultrapure water production system based on a mercury-free ultraviolet lamp as described in claim 5, characterized in that: The ultraviolet inlet pipe (27) is connected to a conductivity detector (25), and the ultraviolet inlet pipe (27) is connected to an outlet pipe (26), which is connected to the second concentrate outlet pipe (34).

8. A pure water and ultrapure water production system based on a mercury-free ultraviolet lamp as described in claim 1, characterized in that: The pure water collection tank (32) is connected to a liquid level sensor (56). The pure water collection tank (32) is provided with several sets of sensors. The pure water collection tank (32) is connected to the raw water tank (1).

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