Multistage filtering device and filtering method for preparing ultrapure water

Abstract

The invention relates to the field of ultrapure water filtering preparation, in particular to a multistage filtering device and method for ultrapure water preparation, the multistage filtering device comprises a raw water tank, a quartz sand tank is arranged on one side of the raw water tank, and an activated carbon tank is arranged on one side of the quartz sand tank. Through the layered design of the transfer tank I, a water source above is in a pH value detection state, the water source can be conveyed back to the previous step to be filtered again when the pH value does not reach the standard, the water source passes through the RO membrane cylinder when entering the transfer tank I, preliminary filtration is realized, and the water source can be uniformly scattered and the filtration quality can be ensured due to the rotation of the bearing cylinder in the process; meanwhile, stirring fan blades can be driven to rotate, full fusion of a medicament and a water source is ensured, three groups of same structures are arranged, and threshold value setting is performed on each group of PH values according to a filtering standard, so that the water source can be subjected to three-stage layered filtering and sectional PH value detection, and the PH values of the water source are automatically collected and detected layer by layer in the whole process; and the precision and quality of ultrapure water filtration are ensured.

Description

Technical Field

[0001] The invention relates to the field of ultrapure water filtration preparation, and in particular to a multi-stage filtration device and a filtration method for ultrapure water preparation. Background Art

[0002] Ultrapure water filtration preparation is a complex and delicate process, mainly including pretreatment, reverse osmosis, ion exchange and fine treatment. Ultrapure water is widely used in many fields, such as electronics, electricity, electroplating, lighting appliances, laboratories, food, papermaking, daily chemicals, building materials, paint, batteries, testing, biology, pharmaceuticals, petroleum, chemicals, steel, glass, etc. Especially in high-tech fields, such as semiconductor manufacturing and integrated circuit production, ultrapure water is used as process water, and the water quality requirements are extremely high.

[0003] The Chinese patent application with announcement number CN221084849U discloses a multi-stage filter for preparing ultrapure water, including a working box, an upper cover is provided at the upper end of the working box, a fixed frame is fixedly installed on the inner wall of the working box, a through hole is provided at the center of the fixed frame, a filter screen is provided in the through hole, two fixed plates are symmetrically fixedly connected to the side wall of the filter screen, and a clamp block is fixedly connected to the lower end of each fixed plate. In the utility model, the scraper is driven to move left and right by the reduction motor, the reciprocating screw and the reciprocating screw sleeve, and the impurities on the filter screen can be scraped off by the scraper and dropped into the screen frame to avoid clogging of the filter screen; further, the upper cover can be conveniently removed by the fixed block, the mounting plate and the fixing bolt, and the filter screen can be taken out upwards, so that it is convenient to disassemble and clean it regularly to avoid clogging of the filter screen by fine impurities, and the normal use of the filter screen is not affected.

[0004] In the preparation process of existing ultrapure water, it is necessary to go through multiple stages of filtration to make the water source reach the standard of ultrapure water. However, in the actual preparation process, since it needs to go through multiple stages of filtration, and each layer of filtration has its own unique standards, when the filtration does not reach the standard of this level of filtration, timely adjustments need to be made. Generally, this kind of supervision method is to conduct manual sampling and detection of pH value. This method cannot guarantee that each filtered water can be monitored in real time, so there are differences in the quality of the final filtration of ultrapure water, which affects the overall filtration quality.

[0005] Therefore, it is necessary to invent a multi-stage filtration device and filtration method for preparing ultrapure water to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-stage filtration device and filtration method for preparing ultrapure water, which achieves the effect of ensuring the filtration quality by three-stage layered filtration and performing segmented pH value detection on the water source by transfer during the filtration process, so as to solve the problem that the pH value random sampling method in the prior art cannot ensure the filtration quality of ultrapure water.

[0007] In order to achieve the above-mentioned object, the present invention provides the following technical scheme: a multi-stage filtration device for preparing ultrapure water, comprising a raw water tank, a quartz sand tank is arranged on one side of the raw water tank, an activated carbon tank is arranged on one side of the quartz sand tank, a reverse osmosis filter is arranged on one side of the activated carbon tank, a transfer tank 1 is arranged between the reverse osmosis filter and the activated carbon tank, an ultraviolet disinfection machine is arranged on one side of the reverse osmosis filter, a transfer tank 2 is arranged between the ultraviolet disinfection machine and the reverse osmosis filter, a pure water tank is arranged on one side of the ultraviolet disinfection machine, and a transfer tank 3 is arranged between the pure water tank and the ultraviolet disinfection machine;

[0008] The water inlet filter assembly includes a water inlet 1, which is opened above the raw water tank, and a connecting cylinder 1 is connected to the flange above the water inlet 1 for preliminary filtering of the water source entering the raw water tank;

[0009] The uniform filtering component includes a water inlet 2, which is opened above the activated carbon tank, and a connecting tube 2 is connected to the upper flange of the water inlet 2, and a sealing tube is installed in the connecting tube 2;

[0010] The dosing stirring assembly includes a connecting pipe 1, the connecting pipe 1 is connected to one side of the connecting tube 2, one side of the connecting pipe 1 is connected to a stirring barrel, one side of the stirring barrel is connected to a delivery pump 1, and the delivery pump 1 is fixedly connected to the outside of the quartz sand tank;

[0011] The pH detection component is arranged on the outside of the transfer tank 1, the transfer tank 2 and the transfer tank 3, and is used to detect the pH value of the water sources inside the three.

[0012] As a preferred solution of the present invention, the water inlet filter assembly also includes a fixed cylinder, which is threadedly sleeved on a connecting cylinder, a leakage cylinder is connected through the connecting cylinder, an RO membrane cylinder is connected through the leakage cylinder, and the RO membrane cylinder is connected to the fixed cylinder, a plurality of through holes are arranged in a circular shape on the inner wall of the leakage cylinder, and a water outlet is arranged on one side below the raw water tank.

[0013] As a preferred solution of the present invention, the uniform filtering assembly also includes a motor, which is installed above the connecting cylinder 2. A connecting shaft is installed at the output end of the motor, and the connecting shaft and the sealing cylinder are penetrated, an annular slide rail is installed inside the quartz sand tank, a bearing cylinder is arranged in the quartz sand tank, and quartz sand is placed in the bearing cylinder, and the inside of the bearing cylinder is fixedly connected to the connecting shaft, a positioning ring is fixedly sleeved on the outside of the bearing cylinder, and the positioning ring is slidably connected to the annular slide rail.

[0014] As a preferred solution of the present invention, a plurality of connecting holes 1 are arranged in a circular distribution on the inner wall of the second connecting tube, a plurality of connecting holes 2 are arranged in a circular distribution on the inner wall of the supporting tube, a fixed shaft is rotatably connected between the bottom of the supporting tube and the inner wall of the activated carbon canister, a water outlet 2 is arranged on one side of the bottom of the activated carbon canister, the internal structure of the activated carbon canister is the same as that of the quartz sand canister, and activated carbon is placed in the supporting tube inside the activated carbon canister.

[0015] As a preferred solution of the present invention, the dosing and stirring assembly further comprises a connecting pipe 2, which is installed on a side of the delivery pump 1 away from the connecting pipe 1, and the connecting pipe 2 is flange-connected to the water outlet 1.

[0016] As a preferred solution of the present invention, a dosing tank is installed through the top of the stirring barrel, and flocculant is placed in the dosing tank, a rotating shaft is rotatably connected in the dosing tank, a plurality of groups of stirring blades are sleeved and fixed on the rotating shaft, and the stirring blades are all arranged in the stirring barrel, a bevel gear 1 is fixedly connected to one side of the rotating shaft, a bevel gear 2 is meshed with one side of the bevel gear 1, and the bevel gear 2 is sleeved and fixed to the connecting shaft, and the connection method of the activated carbon tank and the quartz sand tank is the same as the connection method of the quartz sand tank and the raw water tank, and scale inhibitor is placed in the dosing tank between the two.

[0017] As a preferred embodiment of the present invention, the PH detection component includes a delivery pump 2, which is installed on the outside of the transfer tank 1, one side of the delivery pump 2 is connected to the water outlet pipe 2 of the activated carbon tank, and the other side of the delivery pump 2 is connected to the internal pipe of the fixed cylinder, a conical partition is installed on the inner wall of the transfer tank 1, and the conical partition divides the transfer tank 1 into two parts, the upper and lower parts, and the water inlet filter assembly is located in the upper half of the transfer tank 1, and an electromagnetic control valve is installed at the lowest point of the conical partition.

[0018] As a preferred embodiment of the present invention, a pH monitor is installed on the inner wall of the transfer tank one, and the pH monitor is located in the upper half of the transfer tank one, a delivery pump three is installed on the outer side of the transfer tank one, and the delivery pump three is connected to the upper half of the transfer tank one pipeline, and the other side of the delivery pump three is connected to the fixed cylinder pipeline above the raw water tank, the lower half of the transfer tank one is through-connected with a connecting pipeline three, and the connecting pipeline three is connected to the reverse osmosis filter, the transfer tank two is connected to the reverse osmosis filter and the ultraviolet disinfector in this way, and the delivery pump three of the transfer tank two is connected to the upper half of the transfer tank one pipeline, and the transfer tank three is also connected to the ultraviolet disinfector, the pure water tank and the transfer tank two pipeline in this way.

[0019] A multi-stage filtration method for preparing ultrapure water, comprising the multi-stage filtration device for preparing ultrapure water as described above, wherein the specific processing steps are as follows:

[0020] S1: The water source is transported to the raw water tank through the water inlet pipe, and the water source is filtered through the quartz sand tank and the activated carbon tank. The completed water source will be discharged into the upper part of the transfer tank 1. At this time, the transfer tank 1 stops taking in water, and the excess water source will be stored in the activated carbon tank;

[0021] S2: At this time, the pH monitor monitors the water source here. If the test passes, the water source will be discharged into the lower half of the transfer tank 1. If the test fails, the water source will be discharged into the raw water tank again through the transfer pump 3 for secondary repeated filtration.

[0022] In the above technical solution, compared with the prior art, the technical effects and advantages provided by the present invention are as follows:

[0023] Through the layered design of the transfer tank, the upper part can be in a PH value detection state and the lower part can be in a water storage state, so that after the water source is detected, its PH value can be analyzed whether it meets the standard. If it does not meet the standard, it can be transported back to the previous step for re-filtration. When the water source enters the transfer tank, it will pass through the RO membrane cylinder to obtain preliminary filtration. In this process, the rotation of the supporting cylinder can ensure that the water source is evenly sprinkled, thereby ensuring the quality of filtration. At the same time, it can drive the stirring fan blades to rotate to ensure the full integration of the agent and the water source. By setting three groups of the same structure and method, and each group of PH values ​​is set with a threshold value according to the filtration standard, the water source can undergo three-level layered filtration and segmented PH value detection, and the PH value of the water source is collected and detected layer by layer in an automated manner throughout the process, ensuring the accuracy and quality of ultrapure water filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the layout structure of the transfer tank of the present invention;

[0027] Figure 3 It is a schematic diagram of the planed structure of the quartz sand tank and the activated carbon tank of the present invention;

[0028] Figure 4 It is a schematic diagram of the internal structure of the transfer tank of the present invention;

[0029] Figure 5 It is a schematic diagram of the partial planing structure of the transfer tank of the present invention;

[0030] Figure 6 It is a schematic diagram of the internal structure of the raw water tank of the present invention;

[0031] Figure 7 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0032] Figure 8 For the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0033] Fig. 9 For the present invention Figure 5 The enlarged structural diagram at C in the middle;

[0034] Fig.10 For the present invention Figure 5 The enlarged structural diagram at D in the middle;

[0035] Fig.11 It is a pH value detection control flow chart of the present invention.

[0036] Description of reference numerals:

[0037] 001, raw water tank; 101, quartz sand tank; 102, activated carbon tank; 103, reverse osmosis filter; 104, transfer tank one; 105, ultraviolet disinfection machine; 106, transfer tank two; 107, pure water tank; 108, transfer tank three; 002, water inlet filter assembly; 201, water inlet one; 202, connecting cylinder one; 203, fixed cylinder; 204, leakage cylinder; 205, RO membrane cylinder; 206, through hole; 207, water outlet one; 003, uniform filtration assembly; 301, water inlet two; 302, connecting cylinder two; 303, sealing cylinder; 304, motor; 305, connecting shaft; 306, ring Slide rail; 307, bearing cylinder; 308, positioning ring; 309, connecting hole one; 310, connecting hole two; 311, fixed shaft; 312, water outlet two; 004, dosing and stirring assembly; 401, connecting pipe one; 402, stirring barrel; 403, delivery pump one; 404, connecting pipe two; 405, dosing tank; 406, stirring fan blade; 407, rotating shaft; 408, bevel gear one; 409, bevel gear two; 005, PH detection assembly; 501, delivery pump two; 502, conical partition; 503, electromagnetic control valve; 504, PH monitor; 505, delivery pump three; 506, connecting pipe three. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] The present invention provides Figure 1-11 A multi-stage filtration device for preparing ultrapure water shown in the figure comprises a raw water tank 001, a quartz sand tank 101 is arranged on one side of the raw water tank 001, an activated carbon tank 102 is arranged on one side of the quartz sand tank 101, a reverse osmosis filter 103 is arranged on one side of the activated carbon tank 102, a transfer tank 104 is arranged between the reverse osmosis filter 103 and the activated carbon tank 102, an ultraviolet disinfection machine 105 is arranged on one side of the reverse osmosis filter 103, a transfer tank 2 106 is arranged between the ultraviolet disinfection machine 105 and the reverse osmosis filter 103, a pure water tank 107 is arranged on one side of the ultraviolet disinfection machine 105, and a transfer tank 3 108 is arranged between the pure water tank 107 and the ultraviolet disinfection machine 105;

[0040] The water inlet filter assembly 002 includes a water inlet 201, which is located above the raw water tank 001. A connecting tube 202 is connected to the flange above the water inlet 201 to perform preliminary filtration on the water source entering the raw water tank 001.

[0041] Water can enter the raw water tank 001 through the water inlet 201.

[0042] The uniform filtering component 003 includes a second water inlet 301, which is opened above the activated carbon tank 102. A second connecting tube 302 is connected to the flange of the second water inlet 301, and a sealing tube 303 is installed in the second connecting tube 302;

[0043] Water can enter the activated carbon tank 102 through the second water inlet 301.

[0044] The dosing stirring assembly 004 includes a connecting pipe 401, which is connected to one side of the connecting tube 302, and a stirring barrel 402 is connected to one side of the connecting pipe 401, and a delivery pump 403 is connected to one side of the stirring barrel 402, and the delivery pump 403 is fixedly connected to the outside of the quartz sand tank 101;

[0045] The connecting pipe 1 401 can transport the water source to the connecting tube 2 302 through the delivery pump 1 403 .

[0046] The pH detection component 005 is arranged on the outside of the transfer tank 1 104, the transfer tank 2 106 and the transfer tank 3 108, and is used to detect the pH value of the water sources inside the three.

[0047] Furthermore, in the above structure, the water inlet filter assembly 002 also includes a fixed cylinder 203, which is threadedly sleeved on the connecting cylinder 202, and a leakage cylinder 204 is connected through the connecting cylinder 202, and an RO membrane cylinder 205 is connected through the leakage cylinder 204, and the RO membrane cylinder 205 is connected to the fixed cylinder 203, and a plurality of through holes 206 are arranged in a ring-shaped distribution on the inner wall of the leakage cylinder 204, and a water outlet 207 is arranged on the lower side of the raw water tank 001.

[0048] The water source entering the fixed cylinder 203 can be transported downward through the RO membrane cylinder 205, and the water source can be filtered, and the water source can be transported to the raw water tank 001 through the leakage cylinder 204. The RO membrane cylinder 205 can effectively remove impurities and pollutants in the water.

[0049] Furthermore, in the above structure, the uniform filtering component 003 also includes a motor 304, which is installed above the connecting cylinder 302, and a connecting shaft 305 is installed at the output end of the motor 304, and the connecting shaft 305 and the sealing cylinder 303 are penetrated, and an annular slide rail 306 is installed inside the quartz sand tank 101, and a supporting cylinder 307 is arranged in the quartz sand tank 101, and quartz sand is placed in the supporting cylinder 307, and the inside of the supporting cylinder 307 is fixedly connected to the connecting shaft 305, and a positioning ring 308 is fixedly sleeved on the outer side of the supporting cylinder 307, and the positioning ring 308 is slidably connected to the annular slide rail 306.

[0050] The motor 304 can drive the connecting shaft 305 to rotate, thereby rotating the supporting cylinder 307 , and due to the cooperation between the positioning ring 308 and the annular slide rail 306 , the supporting cylinder 307 can rotate stably in the quartz sand tank 101 .

[0051] Furthermore, in the above structure, a plurality of groups of connection holes 309 are arranged in a circular shape on the inner wall of the second connecting cylinder 302, a plurality of groups of connection holes 310 are arranged in a circular shape on the inner wall of the supporting cylinder 307, a fixed shaft 311 is rotatably connected between the bottom of the supporting cylinder 307 and the inner wall of the activated carbon tank 102, a water outlet 312 is arranged on one side of the bottom of the activated carbon tank 102, and the internal structure of the activated carbon tank 102 is the same as that of the quartz sand tank 101, and activated carbon is placed in the supporting cylinder 307 inside the activated carbon tank 102.

[0052] Through the connecting hole 1 309 on the connecting tube 2 302, the water source entering the connecting tube 2 302 can be discharged along the inside thereof and fall into the supporting tube 307 below. Due to the rotation of the supporting tube 307, the water source can be ensured to fall into the inside thereof evenly, and the water source can be filtered by the quartz sand inside, and then discharged from the supporting tube 307 through the connecting hole 2 310, and fall at the bottom of the quartz sand tank 101 for storage.

[0053] Furthermore, in the above structure, the dosing and stirring assembly 004 also includes a connecting pipe 2 404, which is installed on a side of the delivery pump 1 403 away from the connecting pipe 1 401, and the connecting pipe 2 404 is flange-connected to the water outlet 1 207.

[0054] The water source in the raw water tank 001 can be extracted and transported through the connecting pipe 2 404 through the delivery pump 1 403 .

[0055] Furthermore, in the above structure, a dosing tank 405 is installed through the top of the stirring barrel 402, and flocculant is placed in the dosing tank 405, a rotating shaft 407 is rotatably connected in the dosing tank 405, a plurality of groups of stirring blades 406 are sleeved and fixed on the rotating shaft 407, and the stirring blades 406 are all arranged in the stirring barrel 402, a bevel gear 1 408 is fixedly connected to one side of the rotating shaft 407, a bevel gear 2 409 is meshed with one side of the bevel gear 1 408, and the bevel gear 2 409 is sleeved and fixed with the connecting shaft 305, and the connection method between the activated carbon tank 102 and the quartz sand tank 101 is the same as the connection method between the quartz sand tank 101 and the raw water tank 001, and scale inhibitor is placed in the dosing tank 405 between the two.

[0056] Through the cooperation of bevel gear 1 408 and bevel gear 2 409, the connecting shaft 305 can drive the stirring blade 406 on the rotating shaft 407 to rotate when it rotates. At this time, the medicine in the dosing tank 405 can be added into the dosing tank 405. At the same time, the stirring blade 406 can make the medicine and the water source quickly merge. The function of the flocculant is to remove suspended particles and impurities in the water, reduce the turbidity of the water body, and promote the efficiency of subsequent treatment. The main function of the scale inhibitor is to prevent the mutual contact and coagulation between scaling particles, thereby preventing the growth of scale.

[0057] Furthermore, in the above structure, the PH detection component 005 includes a delivery pump 501, which is installed on the outside of the transfer tank 104, one side of the delivery pump 501 is connected to the water outlet 312 pipeline of the activated carbon tank 102, and the other side of the delivery pump 501 is connected to the internal pipeline of the fixed cylinder 203, a conical partition 502 is installed on the inner wall of the transfer tank 104, and the conical partition 502 divides the transfer tank 104 into two parts, and the water inlet filter component 002 is located in the upper half of the transfer tank 104, and an electromagnetic control valve 503 is installed at the lowest point of the conical partition 502.

[0058] The water source in the activated carbon tank 102 can be transported to the upper half of the transfer tank 104 through the delivery pump 2 501, and the water source in the upper half can be transferred to the lower half by opening the electromagnetic control valve 503. During the transfer operation of the electromagnetic control valve 503, the delivery pump 2 501 will stop taking in water.

[0059] Furthermore, in the above structure, a pH monitor 504 is installed on the inner wall of the transfer tank 104, and the pH monitor 504 is located in the upper half of the transfer tank 104, a delivery pump 3 505 is installed on the outer side of the transfer tank 104, and the delivery pump 3 505 is connected to the upper half of the transfer tank 104, and the other side of the delivery pump 3 505 is connected to the fixed cylinder 203 above the raw water tank 001, and the lower half of the transfer tank 104 is connected to the fixed cylinder 203. It is connected with a connecting pipe three 506, and the connecting pipe three 506 is connected to the reverse osmosis filter 103, the transfer tank two 106 is connected to the reverse osmosis filter 103 and the ultraviolet disinfection machine 105 in this way, and the delivery pump three 505 of the transfer tank two 106 is connected to the upper half of the transfer tank one 104 pipeline, and the transfer tank three 108 is also connected to the ultraviolet disinfection machine 105, the pure water tank 107 and the transfer tank two 106 pipeline in this way.

[0060] The pH value in the water source is detected by the pH monitor 504, and during the detection process, the delivery pump 2 501, the electromagnetic control valve 503 and the delivery pump 3 505 are all in a closed state. When the pH value reaches the standard, the background control center will automatically open the electromagnetic control valve 503. When the downward transfer is completed, the delivery pump 2 501 will supply water. Otherwise, the delivery pump 3 505 will work to deliver the water back to the raw water tank 001.

[0061] A multi-stage filtration method for preparing ultrapure water, comprising the multi-stage filtration device for preparing ultrapure water as described above, wherein the specific processing steps are as follows:

[0062] S1: The water source is transported to the raw water tank 001 through the water inlet pipe, and the water source is filtered through the quartz sand tank 101 and the activated carbon tank 102. The completed water source will be discharged into the upper part of the transfer tank 104. At this time, the transfer tank 104 stops taking in water, and the excess water source will be stored in the activated carbon tank 102;

[0063] S2: At this time, the pH monitor 504 monitors the water source here. If the test passes, the water source will be discharged into the lower half of the transfer tank 104. If the test fails, the water source will be discharged into the raw water tank 001 again through the transfer pump 3 505 for secondary repeated filtration.

[0064] like Figure 1-11 As shown, by adding external water source into the fixed cylinder 203, the water source is transported downward along the RO membrane cylinder 205, and enters the raw water tank 001 along the through hole 206 of the leakage cylinder 204. At this time, the delivery pump 1 403 will transport the water source in the raw water tank 001 to the mixing barrel 402 through the connecting pipe 2 404 and the water outlet 1 207. At this time, the dosing tank 405 will add the agent into the water source in the mixing barrel 402, and the stirring fan blade 406 will stir to ensure the full fusion of the agent. At the same time, the water source is continuously transported along the connecting cylinder 2 302, and flows into the supporting cylinder 307 through the connecting hole 1 309. At the same time, the rotation of the supporting cylinder 307 can ensure that the water source falls evenly inside, so The water source is filtered and filtered in the activated carbon tank 102 in the same way. At this time, the water source will undergo the first stage of filtration, and at the same time, the water source is transported to the upper part of the transfer tank 104, and is tested by the PH monitor 504. When the PH value of the water source meets the standard, it can be transported to the reverse osmosis filter 103. If the PH value of the water source does not meet the standard, it is transported back to the raw water tank 001 through the delivery pump 3 505, so as to undergo secondary filtration, and the subsequent transfer tank 2 106 and transfer tank 3 108 will undergo this method at the same time. Through this structure and method, the water source can undergo three-stage filtration, and the PH value of the water source can be collected and tested layer by layer in an automated manner, thereby ensuring the accuracy and quality of ultrapure water filtration.

[0065] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-stage filtration device for preparing ultrapure water, comprising a raw water tank (001), characterized in that: A quartz sand tank (101) is provided on one side of the raw water tank (001), an activated carbon tank (102) is provided on one side of the quartz sand tank (101), a reverse osmosis filter (103) is provided on one side of the activated carbon tank (102), a transfer tank 1 (104) is provided between the reverse osmosis filter (103) and the activated carbon tank (102), an ultraviolet disinfection machine (105) is provided on one side of the reverse osmosis filter (103), a transfer tank 2 (106) is provided between the ultraviolet disinfection machine (105) and the reverse osmosis filter (103), a pure water tank (107) is provided on one side of the ultraviolet disinfection machine (105), and a transfer tank 3 (108) is provided between the pure water tank (107) and the ultraviolet disinfection machine (105); The water inlet filter assembly (002) disposed in the raw water tank (001) comprises a water inlet port 1 (201), wherein the water inlet port 1 (201) is disposed above the raw water tank (001), and a connecting tube 1 (202) is connected to the flange above the water inlet port 1 (201) for preliminary filtering of the water source entering the raw water tank (001); The uniform filtering assembly (003) disposed in the quartz sand tank (101) and the activated carbon tank (102) comprises a second water inlet (301), wherein the second water inlet (301) is opened above the activated carbon tank (102), a second connecting tube (302) is connected to the flange of the second water inlet (301), and a sealing tube (303) is installed in the second connecting tube (302); The dosing stirring assembly (004) disposed on one side of the quartz sand tank (101) and the activated carbon tank (102) comprises a connecting pipe (401), the connecting pipe (401) is connected to one side of the connecting tube (302), one side of the connecting pipe (401) is connected to a stirring barrel (402), one side of the stirring barrel (402) is connected to a delivery pump (403), and the delivery pump (403) is fixedly connected to the outside of the quartz sand tank (101); The pH detection component (005) is arranged outside the transfer tank 1 (104), the transfer tank 2 (106) and the transfer tank 3 (108) and is used to detect the pH value of the water sources inside the three tanks.

2. A multi-stage filtration device for preparing ultrapure water according to claim 1, characterized in that: The water inlet filter assembly (002) further comprises a fixed cylinder (203), wherein the fixed cylinder (203) is threadedly sleeved on the connecting cylinder (202), wherein the connecting cylinder (202) is penetrated by a leakage cylinder (204), wherein the leakage cylinder (204) is penetrated by an RO membrane cylinder (205), and the RO membrane cylinder (205) is connected to the fixed cylinder (203), wherein a plurality of groups of through holes (206) are arranged in an annular shape on the inner wall of the leakage cylinder (204), and a water outlet (207) is arranged on one side below the raw water tank (001).

3. The multi-stage filtration device for preparing ultrapure water according to claim 1, characterized in that: The uniform filtering assembly (003) also includes a motor (304), which is installed above the second connecting cylinder (302). A connecting shaft (305) is installed on the output end of the motor (304), and the connecting shaft (305) and the sealing cylinder (303) are arranged through each other. An annular slide rail (306) is installed inside the quartz sand tank (101). A bearing cylinder (307) is arranged inside the quartz sand tank (101), and quartz sand is placed in the bearing cylinder (307). The inside of the bearing cylinder (307) is fixedly connected to the connecting shaft (305). A positioning ring (308) is fixedly sleeved on the outside of the bearing cylinder (307), and the positioning ring (308) is slidably connected to the annular slide rail (306).

4. A multi-stage filtration device for preparing ultrapure water according to claim 3, characterized in that: The inner wall of the second connecting tube (302) is provided with a plurality of first connecting holes (309) in an annular arrangement, the inner wall of the supporting tube (307) is provided with a plurality of second connecting holes (310) in an annular arrangement, a fixed shaft (311) is rotatably connected between the bottom of the supporting tube (307) and the inner wall of the activated carbon tank (102), a second water outlet (312) is provided on one side of the bottom of the activated carbon tank (102), the activated carbon tank (102) and the quartz sand tank (101) have the same internal structure, and activated carbon is placed in the supporting tube (307) inside the activated carbon tank (102).

5. The multi-stage filtration device for preparing ultrapure water according to claim 1, characterized in that: The dosing and stirring assembly (004) also includes a second connecting pipe (404), which is installed on the side of the delivery pump (403) away from the first connecting pipe (401), and the second connecting pipe (404) is flange-connected to the first water outlet (207).

6. A multi-stage filtration device for preparing ultrapure water according to claim 5, characterized in that: A dosing tank (405) is installed through the top of the stirring barrel (402), and flocculant is placed in the dosing tank (405). A rotating shaft (407) is rotatably connected in the dosing tank (405), and a plurality of stirring blades (406) are sleeved and fixed on the rotating shaft (407), and the stirring blades (406) are all arranged in the stirring barrel (402). A bevel gear 1 (408) is fixedly connected to one side of the rotating shaft (407), and a bevel gear 2 (409) is meshed with one side of the bevel gear 1 (408), and the bevel gear 2 (409) is sleeved and fixed with the connecting shaft (305). The connection method of the activated carbon tank (102) and the quartz sand tank (101) is the same as the connection method of the quartz sand tank (101) and the raw water tank (001), and scale inhibitor is placed in the dosing tank (405) between the two.

7. The multi-stage filtration device for preparing ultrapure water according to claim 1, characterized in that: The pH detection component (005) includes a second delivery pump (501), which is installed on the outside of the transfer tank (104). One side of the second delivery pump (501) is connected to the second water outlet (312) pipeline of the activated carbon tank (102), and the other side of the second delivery pump (501) is connected to the internal pipeline of the fixed cylinder (203). A conical partition (502) is installed on the inner wall of the transfer tank (104), and the conical partition (502) divides the transfer tank (104) into two upper and lower parts, and the water inlet filter component (002) is located in the upper half of the transfer tank (104), and an electromagnetic control valve (503) is installed at the lowest point of the conical partition (502).

8. A multi-stage filtration device for preparing ultrapure water according to claim 7, characterized in that: A pH monitor (504) is installed on the inner wall of the transfer tank (104), and the pH monitor (504) is located in the upper part of the transfer tank (104). A delivery pump (505) is installed on the outer side of the transfer tank (104), and the delivery pump (505) is connected to the upper part of the transfer tank (104) through a pipeline, and the other side of the delivery pump (505) is connected to the fixed cylinder (203) above the raw water tank (001) through a pipeline. The lower part of the transfer tank (104) is connected to a connection Pipeline three (506), and connecting pipe three (506) is connected to the reverse osmosis filter (103), the transfer tank two (106) is connected to the reverse osmosis filter (103) and the ultraviolet disinfection machine (105) in this way, and the delivery pump three (505) of the transfer tank two (106) is connected to the upper half of the transfer tank one (104) pipeline, and the transfer tank three (108) is also connected to the ultraviolet disinfection machine (105), the pure water tank (107) and the transfer tank two (106) pipeline in this way.

9. A multi-stage filtration method for preparing ultrapure water, comprising a multi-stage filtration device for preparing ultrapure water according to any one of claims 1 to 8, characterized in that: The processing steps are as follows: S1: The water source is transported to the raw water tank (001) through the water inlet pipe, and the water source is filtered through the quartz sand tank (101) and the activated carbon tank (102). The completed water source will be discharged into the upper part of the transfer tank (104). At this time, the transfer tank (104) stops taking in water, and the excess water source will be stored in the activated carbon tank (102); S2: At this time, the pH monitor (504) monitors the water source here. If the test passes, the water source will be discharged into the lower half of the transfer tank 1 (104). If the test fails, the water source will be discharged into the raw water tank (001) again through the transfer pump 3 (505) for secondary repeated filtration.

Images