Ultrapure water manufacturing system and process

Abstract

The present invention relates to the technical field of ultrapure water preparation, and in particular to an ultrapure water manufacturing system and process, comprising: an ultrafiltration mechanism, the ultrafiltration mechanism is used to ultrafilter raw water and perform self-backwashing. The ultrafiltration mechanism includes an ultrafiltration component for filtering raw water and simultaneously switching ultrafiltration membranes, and a backwash component arranged below the ultrafiltration component and used to backwash the switched ultrafiltration membrane; a reverse osmosis mechanism, the reverse osmosis mechanism is arranged behind the ultrafiltration mechanism and is used to reverse osmosis filter the ultrafiltered water, the reverse osmosis mechanism includes a primary filter component that performs the first back filtration on the water and completes the backwash at the same time, and a secondary filter component that maintains a stable water flow output; a deionization mechanism, the deionization mechanism is arranged below the reverse osmosis mechanism and is used to assist EDI deionization, the deionization mechanism includes an auxiliary component that promotes ion removal and a cleaning component that cleans the electrode plate. The technical problem of short service life of various filter membranes is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrapure water preparation, and in particular to an ultrapure water manufacturing system and process. Background Art

[0002] Ultrapure water, also known as UP water, refers to water with a resistivity of 18 MΩ*cm (at 25°C). This water contains virtually no impurities other than water molecules, including bacteria, viruses, organic matter like chlorinated dioxins, and essential minerals and trace elements. This water is essentially water from which virtually all atoms except oxygen and hydrogen have been removed. It can be used in the preparation of ultrapure materials (such as semiconductor components and nano-fine ceramics) using distillation, deionization, reverse osmosis, or other appropriate supercritical fine technology.

[0003] Patent document CN109562964B discloses ultrapure water production equipment, including an ultrafiltration membrane device. The ultrafiltration membrane device comprises a plurality of ultrafiltration membranes connected in series. The plurality of ultrafiltration membranes comprises a first ultrafiltration membrane and a second ultrafiltration membrane located furthest downstream of the plurality of ultrafiltration membranes, wherein the second ultrafiltration membrane has different filtration properties from those of the first ultrafiltration membrane.

[0004] However, in actual use, the production of ultrapure water requires the use of multiple membranes for filtration, but as the usage time increases, the filtration performance of the membrane will gradually deteriorate. Summary of the Invention

[0005] The purpose of the present invention is to address the shortcomings of the existing technology. By setting up an ultrafiltration mechanism, a reverse osmosis mechanism and a deionization mechanism, various filter membranes can be cleaned while achieving efficient preparation of pure water, thereby ensuring the filtration efficiency of the filter membranes and solving the technical problem of short service life of various filter membranes.

[0006] In response to the above technical problems, the technical solutions adopted are as follows:

[0007] An ultrapure water production system includes a bag filter unit for preliminary filtration of raw water, a UV sterilizer unit for sterilizing pure water, a precision filter unit arranged behind the UV sterilizer unit, and a filtration unit arranged between the bag filter unit and the UV sterilizer unit and for filtering the raw water, wherein the filtration unit includes:

[0008] An ultrafiltration mechanism, the ultrafiltration mechanism is used to ultrafilter the raw water and perform self-backwashing. The ultrafiltration mechanism includes an ultrafiltration assembly for filtering the raw water and simultaneously switching the ultrafiltration membrane, and a backwash assembly disposed below the ultrafiltration assembly and for backwashing the switched ultrafiltration membrane;

[0009] A reverse osmosis mechanism is provided behind the ultrafiltration mechanism and is used to perform reverse osmosis filtration on the ultrafiltered water. The reverse osmosis mechanism includes a primary filtration component that performs the first reverse filtration and backwashing of the water and a secondary filtration component that maintains a stable water flow output;

[0010] The deionization mechanism is arranged below the reverse osmosis mechanism and is used to assist EDI deionization. The deionization mechanism includes an auxiliary component for promoting ion removal and a cleaning component for cleaning the electrode plate.

[0011] Preferably, the ultrafiltration assembly includes a raw water tank for holding raw water, two sets of arc-shaped ultrafiltration plates vertically sliding on one side of the raw water tank and arranged in contact with each other, a clamping groove provided on the bottom side of the two sets of ultrafiltration plates, a first telescopic cylinder provided on one side of the arc-shaped ultrafiltration plate and used to drive the arc-shaped ultrafiltration plate to move up and down, and a clamping block provided at the end of the first telescopic cylinder and driven by a motor;

[0012] Preferably, the primary filtration component includes an annular transfer tank arranged outside the raw water tank, a partition plate rotatably connected in the transfer tank and driven by a motor, a first semipermeable membrane arranged on the side wall of the transfer tank and opposite to the ultrafiltration plate, a No. 1 water storage tank arranged outside the semipermeable membrane, a push plate arranged on one side of the first semipermeable membrane transfer tank and driven by an electric cylinder, and a water retention groove provided on the push plate.

[0013] Preferably, the primary filtration assembly further comprises a reflux plate arranged outside the first semipermeable membrane, the bottom of the reflux plate is horizontally slidably connected to the side wall of the No. 1 water storage tank and a spring is provided between the reflux plate and the side wall of the water outlet side.

[0014] Preferably, the backwash component includes a concentrated water tank arranged at the bottom of the transfer tank, a water hole arranged on the inner side of the No. 1 semipermeable membrane, a sealing plug arranged in the water hole and controlled by an electric cylinder, a spray group arranged on the side of the concentrated water tank close to the ultrafiltration membrane and composed of multiple groups of nozzles, and a recovery pipe arranged at the bottom of the ultrafiltration membrane.

[0015] Preferably, the secondary filtration component includes a flow stabilization tank arranged below the No. 1 water storage tank, multiple groups of semi-permeable membrane filter elements arranged in the flow stabilization tank and driven to rotate by a motor, an input pipe connecting the No. 1 water storage tank and one end of the filter element, and a concentrated water pipe connecting the other end of the filter element and the transfer tank.

[0016] Preferably, the auxiliary components include a clean water tank for containing reverse osmosis water for ion removal and connected to a stabilizing tank through a bottom output pipe, a turntable arranged in the middle of the clean water tank and driven by a motor, an anion exchange membrane and a cation exchange membrane that rotate on both sides of the turntable respectively, a gear arranged below the clean water tank and fixedly connected to the rotating shaft of the anion and cation exchange membrane, and a rack arranged below the clean water tank and used to drive the gear to rotate.

[0017] It also includes a water outlet pipe arranged above the middle of the clean water pool and a drainage pipe arranged on both sides of the clean water pool and connected to the No. 1 water storage tank through a water pump.

[0018] Preferably, the auxiliary component also includes two groups of electrodes arranged on both sides of the water purification pool, each group of electrodes includes nested inner and outer plates, fixing ears arranged on the top of the inner and outer plates, a clutch frame that is simultaneously engaged with the fixing ears on the inner and outer plates in different groups of electrodes, a fixed platform for making the clutch frame slide horizontally and driven up and down by a telescopic cylinder, and a drive motor arranged on the fixed platform and used to drive the clutch frame to slide.

[0019] Preferably, the cleaning assembly includes a movable frame fixedly connected to the clutch frame, a slide groove arranged on both sides of the movable frame and located above the motor, a moving block arranged on the slide and driven by a linear motor, and a scraper arranged under the moving block.

[0020] As another preferred embodiment, the ultrapure water manufacturing process is applied to an ultrapure water manufacturing system, including: preliminary filtration, raw water passes through a bag filter unit to filter out larger solid impurities; pure water filtration, filtering through the filter unit layer by layer to form filtered water; disinfection and sterilization, using a UV sterilizer unit to sterilize the filtered water; precision filtration, using a precision filter unit to perform precision filtration to form final pure water; in detail, pure water filtration includes the following steps:

[0021] Step 1, ultrafiltration step, the raw water is passed into the raw water tank, the raw water is filtered through the ultrafiltration membrane, and enters the transfer tank, and is moved to the inner side of the first semipermeable membrane by the rotation of the partition plate;

[0022] Step 2, the first reverse osmosis filtration and backwash step, the ultrafiltration water moved to one side of the first semipermeable membrane passes through the first semipermeable membrane under the push of the push plate and opens the reflux plate, enters the No. 1 water storage tank, and then the push plate is reset, and the reflux plate is also reset under the action of the spring, and the reverse osmosis water between the reflux plate and the first semipermeable membrane is squeezed back into the transfer bin to achieve backwashing of the first semipermeable membrane, and then flows into the concentrated water bin together with the concentrated water that has not passed through the first semipermeable membrane. With continuous purification, the ultrafiltration membrane is switched up and down after a certain period of use. When the upper used ultrafiltration membrane moves down, the nozzle draws concentrated water from the concentrated water bin to backwash the ultrafiltration membrane, and the wastewater flows out of the device through the recovery pipe;

[0023] Step 3: Second reverse osmosis filtration. The water in the No. 1 water storage tank enters the semi-permeable membrane filter element. The filter element rotates to throw out the water in it, enters the stabilizing chamber, and then enters the deionization mechanism through the stabilizing chamber. At the same time, some water is not thrown out of the filter element but flows back to the transfer field through the concentrated water pipe for re-filtration.

[0024] Step 4, deionization step, reverse osmosis water flows into the water purification pool, the electrode plates are charged to remove ions, and the pure water in the middle flows out of the device through the outlet. With long-term use, the turntable rotates. When the turntable rotates °, the anion and cation exchange membrane also rotates to adjust the position of the anion and cation exchange membrane. At the same time, the electrode plates are also switched, and the charges carried by the electrode plates on both sides are also reversed, so that the direction of ions passing through the anion and cation exchange membrane is changed, thereby cleaning the anion and cation exchange membrane. At the same time, the surface of the electrode plate located above and switched is cleaned using a scraper.

[0025] Beneficial effects of the present invention:

[0026] (1) The present invention provides an ultrafiltration mechanism. Under the premise of ensuring uninterrupted filtration of raw water, the filtration performance of the ultrafiltration membrane can be guaranteed by switching the ultrafiltration membrane. At the same time, the intervals between switching the ultrafiltration membrane can be used to clean the replaced ultrafiltration membrane, thereby cleaning the impurities and pollution on the surface of the ultrafiltration membrane and extending the service life of the ultrafiltration membrane.

[0027] (2) The present invention realizes the primary reverse osmosis filtration and the secondary reverse osmosis filtration of water by setting up a reverse osmosis mechanism. While ensuring the filtration efficiency of water, the backwash of the reflux plate is used to frequently clean the first semipermeable membrane, thereby reducing the residual impurities on the first semipermeable membrane. At the same time, the filter element is used to complete the second reverse osmosis filtration of water, thereby reducing the use of water pumps, slowing down the pollution of the semipermeable membrane, and reducing costs.

[0028] (3) In the present invention, the deionization component is used to change the position of the anion and cation exchange membrane and adjust the matching electrode plate, thereby changing the direction of ions passing through the anion and cation semipermeable membrane. By utilizing this change in direction, the ions are prevented from adhering to the anion and cation semipermeable membrane, thereby extending the service life of the anion and cation semipermeable membrane; BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic diagram of the overall structure of an ultrapure water manufacturing system.

[0031] Figure 2 Schematic diagram of the internal structure of an ultrapure water production system.

[0032] Figure 3 Schematic diagram of the structure of the ultrafiltration component.

[0033] Figure 4 This is a structural diagram of the primary filtration component.

[0034] Figure 5 Schematic diagram of the backwash component.

[0035] Figure 6 It is a cross-sectional schematic diagram of the ultrafiltration component and the backwash component.

[0036] Figure 7 This is a schematic diagram of the working status of a primary filtration component.

[0037] Figure 8 It is a structural diagram of the secondary filtration component.

[0038] Figure 9 This is a schematic diagram of the relevant structure of the water purification pool.

[0039] Figure 10 Schematic diagram of the relevant structure of the electrode.

[0040] Figure 11 A schematic cross-sectional view of the auxiliary components.

[0041] Figure 12 Schematic diagram of the cleaning component.

[0042] Figure 13 The figure is a flow chart of an ultrapure water manufacturing process.

[0043] Figure 14 This is the main process flow chart for the preparation of ultrapure water. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings.

[0045] Example 1

[0046] like Figure 1 、 Figure 2 As shown, an ultrapure water production system includes a bag filter unit 01 for preliminary filtration of raw water, a UV sterilizer unit 02 for sterilizing pure water, a precision filter unit 03 arranged behind the UV sterilizer unit 02, and a filtration unit 04 arranged between the bag filter unit 01 and the UV sterilizer unit 02 and for filtering the raw water, wherein the filtration unit 04 includes:

[0047] Ultrafiltration mechanism 1, which is used to ultrafilter raw water and perform self-backwashing. The ultrafiltration mechanism 1 includes an ultrafiltration assembly 11 for filtering raw water and switching ultrafiltration membranes, and a backwash assembly 12 disposed below the ultrafiltration assembly 11 and for backwashing the switched ultrafiltration membranes.

[0048] The reverse osmosis mechanism 2 is arranged behind the ultrafiltration mechanism 1 and is used to reverse osmosis filter the ultrafiltered water. The reverse osmosis mechanism 2 includes a primary filter component 21 that performs the first reverse filtration and backwashing of the water and a secondary filter component 22 that maintains a stable water flow output;

[0049] The deionization mechanism 3 is arranged below the reverse osmosis mechanism 2 and is used to assist in EDI deionization. The deionization mechanism 3 includes an auxiliary component 31 for promoting ion removal and a cleaning component 32 for cleaning the electrode plates.

[0050] In this embodiment, by setting up an ultrafiltration mechanism 1, a reverse osmosis mechanism 2 and a deionization mechanism 3, integrated preparation of ultrapure water is achieved, saving various tanks, pipes and water pumps required for water flow transportation. At the same time, without affecting continuous preparation, backwashing of various membranes can be completed, thereby greatly extending the service life of the ultrafiltration membrane, semipermeable membrane and anion and cation exchange membrane 313 and reducing costs.

[0051] In detail, the main process of ultrapure water preparation is as follows Figure 14 As shown;

[0052] The raw water filtered by the bag filter unit 01 must be filtered through an ultrafiltration membrane, a semipermeable membrane in a two-stage reverse osmosis system, and an anion-cation exchange membrane 313 before it can be converted into ultrapure water. However, during the pure water production process, as the various membranes age, various contaminants gradually adhere to their surfaces, causing a continuous decline in their filtration capacity. Therefore, the membrane's filtration efficiency is generally maintained by either directly replacing the membrane or cleaning it. Directly replacing the membrane incurs high costs. Backflushing is often used to clean the membrane, but since pure water production is a continuous production process, backflushing the membrane often requires downtime, wasting time. Therefore, both methods have certain drawbacks.

[0053] In this application, by setting up an ultrafiltration mechanism 1, a reverse osmosis mechanism 2 and a deionization mechanism 3, pure water is continuously prepared while the membrane is backwashed, slowing down the accumulation of pollutants on the membrane surface, thereby increasing the service life of the membrane and reducing costs.

[0054] It should be noted that in the prior art, in order to allow water to pass through the complete production process, a large number of high-pressure water pumps need to be installed to apply pressure to the water, thereby promoting the operation of the reverse osmosis system, which is relatively expensive. In this application, various methods such as pushing, rotating, and gravity are used to promote the flow of water, reduce the use of high-pressure pumps, and reduce energy consumption.

[0055] It is worth mentioning that the device reduces the setting of various pipelines and integrates various tanks with filtering components to reduce the time required for filtration and improve filtration efficiency.

[0056] Further, if Figure 3 、 Figure 6 As shown, the ultrafiltration assembly 11 includes a raw water tank 111 for holding raw water, two sets of arc-shaped ultrafiltration plates 112 that slide vertically on one side of the raw water tank 111 and are arranged in contact with each other, a clamping groove 113 provided on the bottom side of the two sets of ultrafiltration plates 112, a first telescopic cylinder 114 provided on one side of the arc-shaped ultrafiltration plate 112 and used to drive the arc-shaped ultrafiltration plate 112 to move up and down, and a clamping block 115 provided at the end of the first telescopic cylinder 114 and driven by a motor;

[0057] In this embodiment, ultrafiltration of raw water is achieved by providing a raw water tank 111 and an arc-shaped filter plate. At the same time, the ultrafiltration membrane can always maintain a high filtration efficiency by switching the filter plate up and down.

[0058] In detail, raw water is continuously input into the raw water tank 111, filtered by the ultrafiltration membrane and flows out of the raw water tank 111. As the use time increases, the inner surface of the ultrafiltration membrane is gradually contaminated. At this time, the telescopic rod of the first telescopic cylinder 114 is shortened, and the other ultrafiltration plate 112 at the bottom is pulled up. Then, the motor block 115 rotates, and the block 115 disengages from the slot 113 on the new ultrafiltration plate 112 and is inserted into the slot 113 of the old ultrafiltration plate 112. The telescopic rod of the telescopic cylinder is extended again to move the old ultrafiltration plate 112 to the bottom, completing the switch, thereby ensuring the ultrafiltration efficiency.

[0059] It should be noted that the ultrafiltration membrane filters the raw water, and its main function is to remove large molecular organic matter, proteins, bacteria and viruses in the water. It uses the microporous structure of the ultrafiltration membrane to physically isolate the water, so that when the water passes through the membrane, only small molecular weight substances can pass through, while other large molecular substances are retained on the outside of the filter membrane, so that the initial purification of the water can be achieved. After long-term use, a large amount of impurities are easily adhered to the micropores on the surface of the ultrafiltration membrane, and it is often necessary to use a large water flow for backwashing to achieve a good cleaning effect. Based on this, the two ultrafiltration plates 112 in this application can be switched more frequently, and by cooperating with the subsequent backwash component 12, the shallow pollution of the ultrafiltration membrane can be effectively cleaned to avoid deepening of the pollution and difficulty in cleaning, thereby improving the service life.

[0060] It is worth mentioning that by switching between the two sets of ultrafiltration plates 112, the raw water can be filtered without stopping while there is sufficient time to clean the other ultrafiltration plate 112, thereby increasing the service life of the ultrafiltration membrane.

[0061] Further, if Figure 4 、 Figure 6 、 Figure 7As shown, the primary filtration component 21 includes an annular transfer bin 211 arranged outside the raw water bin 111, a partition plate 212 rotatably connected to the transfer bin 211 and driven by a motor, a first semipermeable membrane 213 arranged on the side wall of the transfer bin 211 and located opposite to the ultrafiltration plate 112, a No. 1 water storage tank 214 arranged on the outside of the semipermeable membrane, a push plate 215 arranged on one side of the first semipermeable membrane 213 transfer bin 211 and driven by an electric cylinder, and a water retention groove 216 provided on the push plate 215.

[0062] In this embodiment, the first reverse osmosis filtration of the ultrafiltration water is achieved by setting the partition plate 212, the push plate 215 and the first semipermeable membrane 213. The push plate 215 is used to push the water through the semipermeable membrane for filtration, while retaining part of the concentrated water for subsequent reuse.

[0063] In detail, the water exceeding the ultrafiltration membrane enters the transfer chamber 211, and the partition plate 212 divides the transfer chamber 211 into multiple groups of spaces. The rotation of the partition plate 212 moves the water from one side of the ultrafiltration membrane to the side of the first semipermeable membrane 213, and then the push plate 215 is pushed out, and the thrust is used to make the water pass through the first semipermeable membrane 213 and flow into the No. 1 water storage tank 214.

[0064] In the existing technology, a high-pressure pump is often used to pump water in, and the pressure of the water pump is used to enable the water to pass through the semipermeable membrane. However, this method is not easy to control the concentration of the separated concentrated water, resulting in a high water content in the concentrated water, reducing the water filtration effect, causing excess water to be filtered out, and increasing the outflow ratio of wastewater.

[0065] It should be noted that the partition plate 212 divides the transfer rack into multiple spaces, so that water can be transported in batches to the side of the first semipermeable membrane 213 for filtration. In the confined space, the thrust of the push plate 215 is used to make the water pass through the semipermeable membrane. At the same time, the water retention groove 216 reserved on the push plate 215 can accommodate concentrated water, thereby realizing the control of the amount of concentrated water.

[0066] It is worth mentioning that by filtering the water in batches, the push plate 215 pushes the water through the first semipermeable membrane 213, and the ultrafiltration membrane on the other side inputs water into the partition plate 212 to accumulate water. In this process, the water in the raw water tank 111 can be kept at a higher water level, and gravity is used to make the water pass through the ultrafiltration membrane instead of using external force to drive the water. This can reduce the degree of intrusion of pollutants into the ultrafiltration membrane and make subsequent cleaning more convenient.

[0067] Further, if Figure 5 、 Figure 7 As shown, the primary filtration component 21 also includes a return plate 217 arranged on the outside of the first semipermeable membrane 213, and the bottom of the return plate 217 is horizontally slidably connected to the side wall of the first water storage tank 214 and a spring is provided between the return plate 217 and the side wall of the water outlet side.

[0068] In this embodiment, the reverse osmosis water is isolated by providing the reflux plate 217 , and the backwash of the first semipermeable membrane 213 is achieved by rebound.

[0069] In detail, when the push plate 215 pushes the water toward the first semipermeable membrane 213, the water pushes the return plate 217 open after passing through the first semipermeable membrane 213, flows out from the outlet above the return plate 217, and enters the first water storage tank. When the push plate 215 returns to its position, the water between the return plate 217 and the push plate 215 loses the driving thrust, and the return plate 217 rebounds rapidly under the action of the spring, squeezing all the water between the return plate 217 and the first semipermeable membrane 213 back into the first semipermeable membrane 213, and using this part of the water to backwash the first semipermeable membrane 213.

[0070] It should be noted that, under the action of the spring, when the return plate 217 is in the initial position, the return plate 217 is attached to the outside of the first semipermeable membrane 213. When the water flows out, the return plate 217 moves, and a gap is opened above the return plate 217. The water can flow out from the top and enter the first water storage tank. At this time, the return plate 217 acts as a partition to separate the water on both sides, so that the water can only flow in one direction, avoiding water flow turbulence and affecting filtration.

[0071] It is worth mentioning that the water can be moved in batches through the partition plate 212, and backwashing can be performed after each water filtration, which greatly improves the service life of the membrane, slows down the adhesion of pollutants on the membrane surface, and enables the membrane to maintain good filtration performance for a longer period of time.

[0072] Further, if Figure 5 As shown, the backwash component 12 includes a concentrated water tank 121 arranged at the bottom of the transfer tank 211, a water hole 122 arranged on the inner side of the No. 1 semipermeable membrane, a sealing plug 123 arranged in the water hole 122 and controlled by an electric cylinder, a spray group 124 arranged on the side of the concentrated water tank 121 close to the ultrafiltration membrane and composed of multiple groups of nozzles, and a recovery pipe 125 arranged at the bottom of the ultrafiltration membrane.

[0073] In this embodiment, the backwashing of the ultrafiltration membrane is achieved by providing a spray group 124, and the pollutants on the inner surface of the ultrafiltration membrane are cleaned by using a spray head.

[0074] In detail, the concentrated water separated by the first semipermeable membrane 213 can be used to backwash the ultrafiltration membrane. Since the first semipermeable membrane is backwashed frequently, it is not easy to accumulate too many pollutants. Therefore, the water used to backwash the first semipermeable membrane 213 can be regarded as concentrated water. After the two are combined, they enter the concentrated water tank 121 through the water hole 122 for storage. When the ultrafiltration membrane is switched, the nozzle sprays water to impact the outer surface of the ultrafiltration membrane, thereby flushing out the pollutants on the inner surface. The wastewater is recovered through the recovery pipe 125 at the bottom and output to the device.

[0075] It should be noted that the concentrated water tank 121 is used to store the concentrated water separated by the first filter membrane to ensure that the spray group 124 has sufficient water when spraying water. The concentrated water is reused to ensure the water output rate of the device.

[0076] Further, if Figure 8 As shown, the secondary filtration component 22 includes a stabilizing chamber 221 arranged below the No. 1 water storage tank 214, multiple groups of semi-permeable membrane filter elements 222 arranged in the stabilizing chamber 221 and driven to rotate by a motor, an input pipe 223 connecting the No. 1 water storage tank 214 and one end of the filter element 222, and a concentrated water pipe 224 connecting the other end of the filter element 222 and the transfer chamber 211.

[0077] In this embodiment, a semi-permeable membrane filter element 222 is provided to achieve a second reverse osmosis filtration of water.

[0078] Specifically, water from water tank No. 1 214 flows into semipermeable membrane filter element 222. Driven by a motor, filter element 222 rotates, causing some of the water inside to be thrown out of filter element 222 and into flow stabilization chamber 221. The remaining water passes through filter element 222, moves from inlet pipe 223 to concentrated water pipe 224, and then flows back into transfer chamber 211. Concentrated water pipe 224 is equipped with a water pump to promote backflow.

[0079] It should be noted that a rotating filter element 222 is used here to perform a second reverse osmosis filtration on the water. The centrifugal force of the rotation of the filter element 222 is used to enable the water to be thrown out of the filter element 222, completing the flow of water while the pollutants can be evenly retained inside the filter element 222. At the same time, the filter element 222 should be set at the bottom of the stabilizing chamber 221. The water thrown out by the filter element 222 is collected in the stabilizing chamber 221, gradually filling up the stabilizing chamber 221, so that the filter element 222 is completely immersed in the water. At this time, the filter element 222 rotates to throw the water out of the filter element 222, and is also subjected to pressure from water in all directions outside. This part of the pressure prevents the pollutants inside the filter element 222 from deeply adhering to the filter element 222, but is distributed in the filter element 222 in a free state, and then enters the concentrated water pipe 224 for reflux, thereby improving the service life of the filter element 222.

[0080] It is worth mentioning that since the first semipermeable membrane 213 in the pre-step is for batch water purification, the batch water intake does not allow the subsequent ion removal step to proceed. Therefore, through the setting of the stabilizing chamber 221, the water can only be output downward after filling the stabilizing chamber 221, so that the water can flow out in a stable state, ensuring the subsequent deionization step.

[0081] Further, if Figure 9 、 Figure 11As shown, the auxiliary component 31 includes a clean water tank 311 for containing reverse osmosis water for ion removal and connected to the stabilizing chamber 221 through a bottom output pipe, a turntable 312 arranged in the middle of the clean water tank 311 and driven by a motor, an anion exchange membrane and a cation exchange membrane rotating on both sides of the turntable 312 respectively, a gear arranged below the clean water tank 311 and fixedly connected to the rotating shaft of the anion and cation exchange membrane 313, and a rack arranged below the clean water tank 311 and used to drive the gear to rotate.

[0082] It also includes a water outlet pipe 314 arranged above the middle of the clean water tank 311 and a drainage pipe 315 arranged on both sides of the clean water tank 311 and connected to the first water tank 214 through a water pump.

[0083] In this embodiment, the ions are removed by providing the clean water tank 311 and the anion and cation exchange membrane 313 , and at the same time, the surface contamination of the anion and cation exchange membrane 313 can be cleared.

[0084] In detail, when the ion removal work is carried out normally, the anion and cation exchange membranes 313 are located on both sides respectively, and various ions pass through the anion and cation exchange membranes 313 from the middle and flow to both sides of the clean water pool 311. With long-term use, some ions may be attached to the side of the anion and cation exchange membrane 313 facing the middle. At this time, the turntable 312 rotates to swap the position of the anion and cation exchange membrane 313. While rotating, the anion and cation exchange membrane 313 itself also rotates 180°, so that the side originally facing the middle faces outward after the rotation is completed. At this time, the corresponding charges carried by the two side plates also change, the positive pole becomes the negative pole, and the negative pole becomes the positive pole. At this time, ion removal is performed again, and the ions in the middle water move to both sides, and at the same time, the attached ions on the outer surface of the ion exchange surface are taken away to complete the cleaning of the anion and cation exchange membrane 313.

[0085] It should be noted that in order to achieve the reversal of the position of the anion and cation exchange membrane 313, it is necessary to rotate the turntable 312 180°. When the turntable 312 rotates a certain angle, the water on the turntable 312 is separated from the water on both sides of the clean water tank 311, and the water at this time does not communicate with each other. Then the anion and cation exchange membrane 313 rotates to avoid the water from communicating with each other when the anion and cation exchange membrane 313 rotates, causing the originally pure water in the middle to be contaminated.

[0086] It is worth mentioning that the concentrated water on both sides of the water purification tank 311 is concentrated water, and the middle is pure water. The concentrated water on both sides flows back to the No. 1 water storage tank 214 through the drainage pipe 315 for reuse, thereby improving the water output rate of the device.

[0087] Further, if Figure 10 、 Figure 11As shown, the auxiliary component 31 also includes two groups of electrodes 316 arranged on both sides of the clean water tank 311, each group of electrodes 316 includes a nested inner electrode plate 3111 and an outer electrode plate 3112, fixed ears 3113 arranged on the top of the inner electrode plate 3111 and the outer electrode plate 3112, a clutch frame 317 that is simultaneously engaged with the fixed ears 3113 on the inner electrode plate 3111 and the outer electrode plate 3112 in different groups of electrodes 316, a fixed platform 318 for making the clutch frame 317 slide horizontally and driven by a telescopic cylinder to move up and down, and a drive motor 319 arranged on the fixed platform 318 and used to drive the clutch frame 317 to slide.

[0088] In this embodiment, by providing an inner electrode plate 3111 and an outer electrode plate 3112, as well as a clutch frame 317 for controlling the movement of the inner and outer electrode plates 3112, the movement of the electrode plates is achieved, so that the motor can cooperate with the rotation of the turntable 312 in the water purification tank 311 and the rotation of the anion and cation exchange membrane 313.

[0089] In detail, by providing the inner electrode plate 3111 and the outer electrode plate 3112 that are interlocked with each other, each time only one outer electrode plate 3112 and one inner electrode plate 3111 are inserted into the water. If two inner electrode plates 3111 or the two outer electrode plates 3112 are inserted into the water at the same time, when the electrode plates are switched, due to the difference in relative distance between the two groups of inner electrode plates 3111 and the two groups of outer electrode plates 3112, when the electrode plates are given equal charges, there will be a difference in the attraction given to the ions in the water by the electrode plates. Since the switching of the electrode plates is carried out simultaneously with the rotation of the anion and cation exchange membrane 313, one side of the anion and cation exchange membrane 313 is always facing the type of electrode plate with greater attraction, and the other side is always facing the type of electrode plate with less attraction. After long-term use, this situation will cause one side to be more contaminated than the other side, which is not conducive to the long-term use of the anion and cation exchange membrane 313.

[0090] By using an inner electrode plate 3111 and an outer electrode plate 3112, the positions of the two electrodes are kept consistent before and after switching, so that the electric field in the water remains stable.

[0091] It should be noted that, through the setting of the clutch frame 317, the clutch frame 317 slides left and right under the drive of the motor. Each time it slides, the two ends of the clutch frame 317 will be stuck in the fixed ears 3113 on the required pole plates, thereby lifting the inner pole plates 3111 and the outer pole plates 3112 on both sides to complete the switching without causing interference.

[0092] Further, if Figure 12As shown, the cleaning assembly 32 includes a movable frame 321 fixedly connected to the clutch frame 317, a slide groove 322 arranged on both sides of the movable frame and located above the motor, a moving block 323 arranged on the slide and driven by a linear motor, and a scraper 324 arranged below the moving block 323.

[0093] In this embodiment, the surface of the electrode plate is cleaned by providing a sliding groove and a scraper 324 .

[0094] Specifically, the chute 322 and scraper 324 are mounted on the clutch frame 317 and move with the clutch frame 317. When the plates are switched, the clutch frame 317 slides horizontally, and the chute 322 also moves horizontally, allowing the scraper to always stay in contact with the plate surface to be cleaned. Driven by a linear motor, the scraper scrapes the plate surface.

[0095] It should be noted that since the plates are arranged on both sides of the clean water tank 311, and both sides of the clean water tank 311 are filled with concentrated water, the water contains various ions. After long-term use, the various ions react and easily cause scaling on the surface of the plates. The scaling on the surface of the plates will be attracted by the electric charge, which is not conducive to the subsequent ion removal, so it needs to be cleaned frequently.

[0096] Example 2

[0097] like Figure 13 As shown, the components identical or corresponding to those in the first embodiment are designated by the corresponding reference numerals in the first embodiment. For simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that:

[0098] Further, if Figure 13 As shown, the ultrapure water manufacturing process is applied to an ultrapure water manufacturing system, including: preliminary filtration, raw water passes through the bag filter unit 01 to filter out large solid impurities; pure water filtration, through the filter unit 04 layer by layer filtration to form filtered water; disinfection and sterilization, using the UV sterilizer unit 03 to sterilize the filtered water; precision filtration, using the precision filter unit 03 to perform precision filtration to form the final pure water. In detail, pure water filtration includes the following steps:

[0099] Step 1, ultrafiltration step, raw water is passed into the raw water tank 111, filtered through the ultrafiltration membrane, and enters the transfer tank 211, and is moved to the inner side of the first semipermeable membrane 213 by the rotation of the partition plate 212;

[0100] Step 2, the first reverse osmosis filtration and backwashing step, the ultrafiltration water moved to one side of the first semipermeable membrane 213 passes through the first semipermeable membrane 213 under the push of the push plate 215 and opens the reflux plate 217, and enters the No. 1 water storage tank 214, then the push plate 215 is reset, and the reflux plate 217 is also reset under the action of the spring, and the reverse osmosis water between the reflux plate 217 and the first semipermeable membrane 213 is squeezed back to the transfer tank 211, to achieve backwashing of the first semipermeable membrane 213, and then flows into the concentrated water tank 121 together with the concentrated water that has not passed through the first semipermeable membrane 213. With continuous purification, the ultrafiltration membrane is switched up and down after a certain period of use. When the upper ultrafiltration membrane that has been used moves down, the nozzle draws the concentrated water in the concentrated water tank 121 to backwash the ultrafiltration membrane, and the wastewater flows out of the device through the recovery pipe 125;

[0101] Step 3: Second reverse osmosis filtration. The water in the first water tank 214 enters the semipermeable membrane filter element 222. The filter element 222 rotates to throw out the water therein, and enters the stabilizing chamber 221. After passing through the stabilizing chamber 221, it enters the deionization mechanism 3. At the same time, some water is not thrown out of the filter element 222 but flows back to the transfer yard through the concentrated water pipe 224 for refiltration.

[0102] Step 4, deionization step, reverse osmosis water flows into the clean water tank 311, the plates are charged to remove ions, and the pure water in the middle flows out of the device through the outlet. With long-term use, the turntable 312 rotates. When the turntable 312 rotates 90°, the anion and cation exchange membrane 313 also rotates to adjust the position of the anion and cation exchange membrane 313. At the same time, the plates are also switched, and the charges carried by the plates on both sides are also reversed, so that the direction of ions passing through the anion and cation exchange membrane 313 is changed, thereby cleaning the anion and cation exchange membrane 313. At the same time, the surface of the upper and switched plate is cleaned using a scraper 324.

[0103] In the description of the present invention, it should be understood that the terms "front and back", "left and right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or components referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the invention.

[0104] Of course, in this technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0105] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art based on the technical guidance of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An ultrapure water production system, characterized in that: The invention comprises a bag filter unit (01) for preliminary filtering of raw water, a UV sterilizer unit (02) for sterilizing pure water, a precision filter unit (03) arranged behind the UV sterilizer unit (02), and a filter unit (04) arranged between the bag filter unit (01) and the UV sterilizer unit (02) and for filtering raw water, wherein the filter unit (04) comprises: An ultrafiltration mechanism (1) is used to ultrafilter raw water and perform self-backwashing; the ultrafiltration mechanism (1) comprises an ultrafiltration component (11) for filtering raw water and simultaneously switching ultrafiltration membranes, and a backwash component (12) disposed below the ultrafiltration component (11) and for backwashing the switched ultrafiltration membranes; A reverse osmosis mechanism (2), the reverse osmosis mechanism (2) being arranged behind the ultrafiltration mechanism (1) and being used to perform reverse osmosis filtration on the ultrafiltered water, the reverse osmosis mechanism (2) comprising a primary filtration component (21) for performing a first reverse osmosis filtration on the water and simultaneously completing backwashing, and a secondary filtration component (22) for maintaining a stable water flow output; A deionization mechanism (3), the deionization mechanism (3) is arranged below the reverse osmosis mechanism (2) and is used to assist in the EDI deionization process, the deionization mechanism (3) comprising an auxiliary component (31) for promoting ion removal and a cleaning component (32) for cleaning the electrode plate; The ultrafiltration assembly (11) comprises a raw water tank (111) for holding raw water, two sets of arc-shaped ultrafiltration plates (112) vertically sliding on one side of the raw water tank (111) and arranged in contact with each other, a clamping groove (113) arranged on the bottom side of the two sets of arc-shaped ultrafiltration plates (112), a first telescopic cylinder (114) arranged on one side of the arc-shaped ultrafiltration plate (112) and used to drive the arc-shaped ultrafiltration plate (112) to move up and down, and a clamping block (115) arranged at the end of the first telescopic cylinder (114) and driven by a motor; The primary filtration assembly (21) comprises an annular transfer chamber (211) disposed outside the raw water chamber (111), a partition plate (212) rotatably connected to the transfer chamber (211) and driven by a motor, a first semipermeable membrane (213) disposed on a side wall of the transfer chamber (211) and located opposite the arc-shaped ultrafiltration plate (112), a first water storage tank (214) disposed outside the first semipermeable membrane, a push plate (215) disposed on a side of the first semipermeable membrane (213) close to the transfer chamber (211) and driven by an electric cylinder, and a water retention trough (216) disposed on the push plate (215); The backwash assembly (12) comprises a concentrated water tank (121) arranged at the bottom of the transfer tank (211), a water hole (122) arranged on the inner side of the first semipermeable membrane, a sealing plug (123) arranged in the water hole (122) and controlled by an electric cylinder, a spray group (124) arranged on the side of the concentrated water tank (121) close to the ultrafiltration membrane and composed of multiple groups of spray heads, and a recovery pipe (125) arranged at the bottom of the ultrafiltration membrane.

2. An ultrapure water production system according to claim 1, characterized in that: The primary filtration assembly (21) further comprises a return plate (217) arranged outside the first semipermeable membrane (213); the bottom of the return plate (217) is horizontally slidably connected to the side wall of the first water storage tank (214), and a spring is provided between the return plate (217) and the side wall of the water outlet side.

3. The ultrapure water production system according to claim 1, characterized in that: The secondary filtration assembly (22) comprises a flow stabilization chamber (221) disposed below the first water storage tank (214), a plurality of groups of semipermeable membrane filter elements (222) disposed within the flow stabilization chamber (221) and driven to rotate by a motor, an input pipe (223) connecting the first water storage tank (214) with one end of the semipermeable membrane filter element (222), and a concentrated water pipe (224) connecting the other end of the semipermeable membrane filter element (222) with the transfer chamber (211).

4. The ultrapure water production system according to claim 1, characterized in that: The auxiliary component (31) includes a clean water tank (311) for accommodating reverse osmosis water for ion removal and connected to a steady flow chamber (221) via a bottom output pipe, a turntable (312) disposed in the middle of the clean water tank (311) and driven by a motor, an anion and cation exchange membrane (313) rotatably connected to both sides of the turntable (312), a gear disposed below the clean water tank (311) and fixedly connected to a rotating shaft of the anion and cation exchange membrane (313), and a rack disposed below the clean water tank (311) and used to drive the gear to rotate; It also includes a water outlet pipe (314) arranged above the middle of the clean water tank (311) and drainage pipes (315) arranged on both sides of the clean water tank (311) and connected to the first water storage tank (214) through a water pump.

5. An ultrapure water production system according to claim 4, characterized in that: The auxiliary component (31) further includes two groups of electrodes (316) arranged on both sides of the clean water tank (311), each group of electrodes (316) including an inner electrode plate (3111) and an outer electrode plate (3112) arranged in a nested manner, fixing ears (3113) arranged on the top of the inner electrode plate (3111) and the outer electrode plate (3112), a clutch frame (317) that is simultaneously engaged with the fixing ears (3113) on the inner electrode plate (3111) and the outer electrode plate (3112) in different groups of electrodes (316), a fixing platform (318) for causing the clutch frame (317) to slide horizontally and to move up and down by being driven by a telescopic cylinder, and a driving motor (319) arranged on the fixing platform (318) for driving the clutch frame (317) to slide.

6. The ultrapure water production system according to claim 1, characterized in that: The cleaning assembly (32) comprises a movable frame (321) fixedly connected to the clutch frame (317), slide grooves (322) arranged on both sides of the movable frame (321) and located above the motor, a moving block (323) arranged on the slide grooves (322) and driven by the linear motor, and a scraper (324) arranged below the moving block (323).

7. An ultrapure water production process, applied to an ultrapure water production system according to any one of claims 1 to 6, characterized in that: The process comprises: preliminary filtration, wherein the raw water passes through a bag filter unit (01) to filter out large solid impurities; pure water filtration, wherein filtered water is formed through layer-by-layer filtration by a filter unit (04); disinfection and sterilization, wherein the filtered water is sterilized by a UV sterilizer unit (02); and precision filtration, wherein the precision filter unit (03) is used to perform precision filtration to form final pure water. The pure water filtration comprises the following steps: Step 1, ultrafiltration step, raw water is passed into the raw water tank (111), filtered through the ultrafiltration membrane, and enters the transfer tank (211), and is moved to the inner side of the first semipermeable membrane (213) by the rotation of the partition plate (212); Step 2, the first reverse osmosis filtration and backwashing step, the ultrafiltration water moved to one side of the first semipermeable membrane (213) passes through the first semipermeable membrane (213) under the push of the push plate (215) and opens the reflux plate (217) and enters the No. 1 water storage tank (214), then the push plate (215) is reset, and the reflux plate (217) is also reset under the action of the spring, and the reverse osmosis water between the reflux plate (217) and the first semipermeable membrane (213) is squeezed back to the transfer tank (211), so as to achieve the backwash of the first semipermeable membrane (213), and then flows into the concentrated water tank (121) together with the concentrated water that has not passed through the first semipermeable membrane (213). With continuous purification, the ultrafiltration membrane is switched up and down after reaching the preset service time limit. When the upper ultrafiltration membrane that has been used moves down, the nozzle extracts the concentrated water in the concentrated water tank (121) to reversely wash the ultrafiltration membrane, and the wastewater flows out of the device through the recovery pipe (125); Step 3, the second reverse osmosis filtration, the water in the first water storage tank (214) enters the semipermeable membrane filter element (222), the semipermeable membrane filter element (222) rotates to throw out the water therein, enters the stabilizing chamber (221), and enters the deionization mechanism (3) through the stabilizing chamber (221), while a part of the water is not thrown out from the semipermeable membrane filter element (222) but flows back to the transfer chamber (211) through the concentrated water pipe (224) for re-filtration; Step 4, deionization step, reverse osmosis water flows into the water purification pool (311), the electrode is charged to remove ions, and the pure water in the middle flows out of the device through the outlet. With long-term use, the turntable (312) rotates. When the turntable (312) rotates 90 degrees, the anion and cation exchange membrane (313) also rotates to adjust the position of the anion and cation exchange membrane (313). At the same time, the electrode is also switched, and the charges carried by the electrode plates on both sides are also reversed, so that the direction of ions passing through the anion and cation exchange membrane (313) is changed, and the anion and cation exchange membrane (313) is cleaned. At the same time, the surface of the electrode plate located above and switched is cleaned using a scraper (324).

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