Water quality purification equipment for chromatography and water treatment method

Abstract

The invention discloses water quality purification equipment for chromatography and a water treatment method, and relates to the technical field of water quality purification equipment.The water quality purification equipment comprises a water purification pipeline and an RO filter element connected to the water purification pipeline, the RO filter element comprises a shell and an RO membrane located in the shell, the RO membrane is internally connected with a water production pipe and a cleaning pipe which are coaxially arranged, a water outlet hole is formed in the cleaning pipe, and the water outlet hole is communicated with the water purification pipeline. A rotating pipe is rotationally connected into the cleaning pipe, strip-shaped grooves for discharging water are circumferentially and uniformly formed in the rotating pipe, and one end, far away from the RO membrane, of the cleaning pipe is externally connected with a pure water pipeline. According to the water quality purification equipment for chromatography and the water treatment method, the RO membrane is flushed from the middle position firstly, then the whole RO filter element is flushed, when impurities at an inlet are flushed firstly, the flushing flow speed is increased, the cleaning efficiency is improved, and the situation that the RO membrane is damaged due to increase of flushing water flow is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification equipment, and more particularly to a chromatographic water purification equipment and a water treatment method. Background Art

[0002] High-purity water is used in analytical techniques such as high-performance liquid chromatography (HPLC), ion chromatography (IC), and gas chromatography (GC) to ensure the accuracy and reliability of the analytical results. Water purification equipment is used to filter raw water into pure water to remove impurities such as organic and inorganic matter, gases, and microorganisms, ensuring that the water quality meets or exceeds the highest standards for laboratory water use, preventing these impurities from interfering with chromatographic analysis results.

[0003] The RO membrane in the water purification equipment will increase the TDS value of the liquid after being left for a long time, which will affect the accuracy of the test. Because after the equipment stops, there is osmotic pressure between the concentrated water and the pure water in the membrane shell, and the phenomenon of osmotic pressure from high concentration to low concentration will occur. This will cause the pure water in the membrane shell to be gradually diluted, and then the TDS value will increase, which will have a great impact on the accuracy of chromatographic detection. Therefore, a membrane backwash structure will be set up inside the water purifier to avoid the problem of excessively high TDS value of the first-stage water outlet, such as: The Chinese patent application number 2021101540454 discloses a backwash filter element and its water purifier water system. The patent has the function of backwashing the RO membrane to reduce the TDS value of the first section of water outlet when the water is taken next time.

[0004] Chinese patent application number 2022100222232 discloses a water purification device, a flushing control method and a water purification system. The patent has the function of cleaning the RO membrane while producing water.

[0005] Water purification equipment still has the following problems: 1. When flushing the entire RO membrane, a certain flow rate is required for back flushing to achieve an effective cleaning effect. However, as the impurity content from the concentrate end to the water inlet end increases (the impurities are the most at the RO membrane inlet end), the resistance becomes greater, resulting in a decrease in the water pressure when the cleaning water reaches the original water inlet end of the RO membrane. The pollutants cannot be effectively flushed away from the membrane surface, and an effective flushing effect cannot be achieved, affecting the flushing efficiency and the TDS value of the next effluent. If the flushing water pressure is increased, the RO membrane will be damaged, affecting the life and use of the RO membrane.

[0006] 2. After the RO membrane is cleaned, although the membrane shell is filled with pure water, the two ends of the RO membrane are still connected to other pipelines, that is, the two ends of the RO membrane are connected to the concentrated water and raw water. The pure water, concentrated water and raw water in the pipeline will gradually affect the RO membrane under the action of osmotic pressure, thereby causing the TDS value in the water to increase.

[0007] 3. Metal electrodes for detecting conductivity and resistivity will be installed in the pure water pipeline. When the TDS value of pure water in the RO membrane increases, the TDS value in the subsequent pipeline will increase. As the TDS value increases, the electrode surface will be contaminated or scaled, thereby affecting the long-term stability and accuracy of the electrode and affecting the analysis of the chromatography.

[0008] Therefore, it is necessary to propose a chromatographic water purification device and a water treatment method to solve the above problems. Summary of the Invention

[0009] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a chromatographic water purification device and a water treatment method to solve the problems raised in the above background technology.

[0010] The technical solution is as follows: the present invention comprises a water purification pipeline and an RO filter element connected to the water purification pipeline. The RO filter element comprises a housing and an RO membrane located within the housing. A coaxially arranged water production pipe and a cleaning pipe are connected to the RO membrane. The cleaning pipe is provided with a water outlet hole. A rotating pipe is rotatably connected to the cleaning pipe. The rotating pipe is provided with circumferentially evenly distributed strip grooves for water outlet. The end of the cleaning pipe away from the RO membrane is externally connected to a pure water pipeline. An annular cover is connected to both ends of the shell, and the annular cover is connected to the clean water pipeline through a water pipe. A return water piston column is slidably connected in the annular cover close to the cleaning pipe, and a water outlet piston column is slidably connected in the annular cover close to the water production pipe. A clamping assembly is connected to the shell, and the clamping assembly drives the return water piston column and the water outlet piston column to move toward the RO membrane and press on both ends of the RO membrane. The return water piston column is connected to the waste water pipeline inside and outside, and the water outlet piston column is connected to the pure water pipeline inside and outside. A rotating assembly is rotatably connected in the return water piston column, and the rotating assembly is connected to the rotating pipe.

[0011] Furthermore, both ends of the housing are connected to a first retaining net, which is in contact with the RO membrane. The ends of the return piston column and the discharge piston column close to the RO membrane are connected to a second retaining net corresponding to the first retaining net. The second retaining net and the first retaining net are both provided with three coaxially arranged annular grooves, and a sealing ring is connected to the second retaining net. A cavity is provided inside the return water piston column and the water outlet piston column, and the diameter of the cavity is larger than the annular groove. A baffle is slidably connected in the cavity, a flushing pipe is connected in the water outlet piston column, and a return water pipe is connected in the return water piston column. The flushing pipe and the return water pipe are both connected to the edge of the baffle, and the flushing pipe and the return water pipe are staggered with the annular groove. An annular cover is extended from one end of the flushing pipe and the return water pipe, and the baffle is connected to a telescopic device to push the baffle to move in the cavity.

[0012] Furthermore, the rotating assembly includes a rotating disk and a baffle plate rotatably connected to the cavity, the baffle plate is provided with multiple groups of return water grooves arranged at equal intervals, each group of the return water grooves and the strip grooves are located on the same plane, and the size of each group of the return water grooves corresponds to the annular groove, and the rotating disk is provided with three groups of coaxially arranged water holes, and the three groups of water holes are staggered; The rotating disk is externally connected to a rotation drive assembly, and the baffle plate and the rotating tube are externally connected to the same rotation drive assembly.

[0013] Furthermore, the clamping assembly includes a connecting frame located at both ends of the housing, the connecting frame is connected to a connecting column, the water outlet piston column and the water return piston column are both connected to the connecting column, a first telescopic rod is connected to the connecting column, and the end of the first telescopic rod is connected to the baffle; A frame is provided on the outside of the shell, and a crankshaft is rotatably connected to the frame, and a connecting rod is rotatably connected between the connecting frame and the crank of the crankshaft, and the connecting frames at both ends are driven to move toward the middle position through the rotation of the crankshaft. A guide frame is connected to the shell, and the connecting frame is slidably connected in the guide frame. The other end of the crankshaft is connected to a driving frame, and a second telescopic rod is rotatably connected to the frame, and the output end of the second telescopic rod is rotatably connected to the driving frame, so that the crankshaft rotates through the driving frame.

[0014] Furthermore, a first rotating shaft is provided on the outside of the cleaning tube, a first gear is connected to the first rotating shaft, the end of the baffle away from the RO membrane and the outer wall of the cleaning tube are both rotatably connected to a second gear, the first gear and the second gear are meshed and connected, the first rotating shaft is connected to an external driving structure, and a telescopic component is connected between the baffle and the second gear.

[0015] Furthermore, a fixed pipe is provided on the outside of the cleaning pipe, the fixed pipe is connected to the annular cover, and the fixed pipe is connected to a rotating shaft frame; A reduction motor is connected to the annular cover close to the fixed tube, the output end of the reduction motor is connected to a second rotating shaft, the second rotating shaft is connected to a third gear, the end of the fixed tube away from the annular cover is rotatably connected to a fourth gear, the third gear and the fourth gear are meshed and connected, and a telescopic assembly is connected between the rotating disk and the fourth gear; The telescopic assembly includes an internal spline and an external spline connected by a spline.

[0016] The transmission gear of said first sliding shaft is connected with a toothed plate, and the toothed plate and the second sliding shaft are connected with a toothed plate at the bottom end of said shaft and the second shaft via a spring; The rotating shaft frame is connected to a third telescopic rod, and the output end of the third telescopic rod is connected to the supporting bar frame to push the supporting bar frame to move.

[0017] Furthermore, a pressure barrel is connected to the clean water pipeline, a cleaning water pipe is connected to the pressure barrel, a first three-way valve is connected to the cleaning water pipe, one interface of the first three-way valve is connected to the cleaning pipe through a water pipe, and the other interface of the first three-way valve is connected to the flushing pipe through a water pipe. The clean water pipeline is connected to a water valve located at the outlet of the water production pipe.

[0018] Furthermore, a raw water pipe is connected to the annular cover near the water outlet piston column, and the raw water pipe is connected to the water inlet end of the clean water pipeline. A concentrated water pipe is connected to the annular cover near the return pipe piston column, and the concentrated water pipe is connected to a second three-way valve. One interface of the second three-way valve is connected to the return pipe through a pipeline, and the other interface is connected to the waste water pipeline through a pipeline. A cleaning water pump is connected to the cleaning water pipe.

[0019] A water treatment method for chromatographic water purification equipment comprises the following steps: Step 1: Water production: Raw water enters the water purification pipeline, enters the RO filter element under the action of the booster pump, and flows out of the water production pipe for use, and the concentrated water flows out of the concentrated water pipe and is discharged into the wastewater pipeline; Step 2: First cleaning step: Start the second telescopic rod, the return water piston column and the water outlet piston column press on both ends of the RO membrane, close the water valve and start the first telescopic rod at one end of the return water piston column. At this time, the return water pipe inlet is exposed, start the cleaning water pump, the first three-way valve and the second three-way valve, pure water enters the rotating tube from the pressure barrel to flush the front half of the RO membrane, and the cleaned sewage enters the wastewater pipeline from the return water pipe; Step 3, Second cleaning: The first three-way valve switches the pipeline state, starts the first telescopic rod at one end of the water outlet piston column, and pure water enters the flushing pipe to flush the entire RO membrane; Step 4. Storage: Reset the structure except for the second telescopic rod. The return piston column and the outlet piston column have been pressing on both ends of the RO membrane. The internal baffle and the cavity are in a fit state. The liquid in the external pipeline cannot enter the RO membrane to affect it.

[0020] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects: 1. This device is equipped with a cleaning pipe component inside the RO membrane, which has the function of flushing the RO membrane from the middle position first and then flushing the entire RO filter element. When flushing impurities at the inlet first, the flushing flow rate is increased, the cleaning efficiency is improved, and damage to the RO membrane caused by increasing the flushing water flow is avoided. At the same time, through the coordinated arrangement of the strip groove, return groove and water hole, it has the function of flushing the inner circle, middle circle and outer circle in sequence, which helps to remove dirt more effectively and prevent pollutants from accumulating on the membrane surface or inside, thereby slowing down the rate of membrane performance degradation.

[0021] 2. This device is equipped with a water outlet piston column and a water return piston column structure at both ends of the RO membrane, which can press on both ends of the RO membrane to prevent the raw water and concentrated water in the external pipeline from entering the RO filter element, avoiding the concentrated water and raw water from affecting the RO membrane and the pure water in the RO membrane under the action of osmotic pressure, and at the same time, avoiding affecting the use of pure water in the subsequent pipeline.

[0022] 3. Through the coordinated setting of the return piston column, the outlet piston column and the water valve, it is possible to prevent the internal pure water from affecting the stability of the metal electrode under the influence of osmotic pressure, prevent contamination or scaling on the electrode surface, and improve the accuracy and service life of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the RO filter element and frame structure of the present invention; Figure 2 Schematic diagram of the housing and annular cover structure of the present invention; Figure 3 Schematic diagram of the RO membrane and cleaning tube structure in the present invention; Figure 4 Schematic diagram of the second baffle and baffle structure in the present invention; Figure 5 Schematic diagram of the rotating disk and baffle structure of the present invention; Figure 6 Schematic diagram of the water hole structure on the rotating disk of the present invention; Figure 7 A schematic diagram of the frame and the second telescopic rod structure of the present invention; Figure 8 Schematic diagram of the annular cover and the reduction motor structure in the present invention; Figure 9Schematic diagram of the driven disc and connecting block structure in the present invention; Figure 10 It is a schematic diagram of the structure of the spline sleeve and the first rotating shaft in the present invention; Figure 11 This is a schematic diagram of the RO filter element in the present invention being located on the water purification pipeline; Figure 12 Schematic diagram of the liquid flow state in different working states of the present invention; Figure 13 Schematic diagram of the crankshaft and connecting rod structure of the present invention; Figure 14 This is a schematic diagram of an end cover structure connected to one side of the second gear in the present invention.

[0024] Reference numerals: 100, RO filter element; 101, housing; 102, RO membrane; 103, water production pipe; 104, cleaning pipe; 105, rotating pipe; 106, strip groove; 107, ring cover; 108, return water piston column; 109, water outlet piston column; 110, rotating disk; 111, baffle plate; 112, return water groove; 113, water hole; 114, inner ring; 115, middle ring; 116, outer ring ; 201, first baffle; 202, second baffle; 203, annular groove; 204, cavity; 205, baffle; 206, flushing pipe; 207, return pipe; 301, connecting frame; 302, connecting column; 303, first telescopic rod; 304, frame; 305, crankshaft; 306, connecting rod; 307, guide frame; 308, drive frame; 309, second telescopic rod; 401, first A rotating shaft; 402, a first gear; 403, a second gear; 404, an inner spline; 405, an outer spline; 406, a pure water inlet pipe; 501, a fixed pipe; 502, a rotating shaft frame; 503, a reduction motor; 504, a second rotating shaft; 505, a third gear; 506, a fourth gear; 507, a driven plate; 508, a spline sleeve; 509, a third rotating shaft; 510, a chain transmission assembly; 511, a connecting block; 512, a rotating member; 513, a supporting bar frame; 514, a connecting plate; 515, a tooth surface; 516, a third telescopic rod; 601, a pressure barrel; 602, a cleaning water pipe; 603, a first three-way valve; 604, a raw water pipe; 605, a concentrated water pipe; 606, a second three-way valve; 607, a waste water pipe; 608, a cleaning water pump; 609, a water valve; 610, an end cover. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0026] Depend on Figures 1 to 14 It includes a water purification pipeline and an RO filter element 100 connected to the water purification pipeline. The water purification pipeline is a pipeline structure of a conventional water purification equipment. A pre-filter element, a PP cotton filter element, an activated carbon filter element, a booster pump and other devices are installed on the pipeline to perform basic water purification functions. The RO filter element 100 includes a shell 101 and an RO membrane 102 located in the shell 101. The RO membrane 102 is connected to a coaxially arranged water production pipe 103 and a cleaning pipe 104. The cleaning pipe 104 is provided with a water outlet. The opposite ends of the water production pipe 103 and the cleaning pipe 104 are sealed to prevent the internal liquid from flowing into each other. The cleaning pipe 104 is rotatably connected to a rotating pipe 105. The rotating pipe 105 is provided with strip grooves 106 for water discharge evenly distributed around the circumference. In this embodiment, there are three strip grooves 106, the same number as the return water grooves 112. The end of the cleaning pipe 104 away from the RO membrane 102 is connected to an external pure water pipeline, through which the cleaning liquid is supplied to the cleaning pipe 104; When producing water, raw water enters from the water inlet end, passes through the RO membrane 102, and flows out from the concentrated water end. The concentrated water flows out, and the water filtered by the RO membrane 102 enters the water production pipe 103. The pure water flows out of the water production pipe 103. The traditional cleaning of the RO membrane 102 is to flush from the concentrated water end to the water inlet end, and clean it by backwashing. However, the flow rate of the cleaning liquid will decrease after passing through the entire RO membrane 102, and the flushing effect on impurities will be reduced. Moreover, since the impurity content is greater closer to the water inlet end, the resistance will also become greater, resulting in a further reduction in the flushing effect. The present application divides the RO membrane 102 into two sections by flushing from the middle position, and first flushes the area with more impurities, thereby increasing the flow rate of the cleaning liquid, increasing the impact force on the impurities, and improving the flushing effect. At the same time, it avoids damage to the RO membrane 102 due to increased water pressure.

[0027] The two ends of the shell 101 are connected with annular covers 107, and the annular cover 107 is connected to the clean water pipeline through a water pipe. One end of the raw water pipe 604 is connected to the water inlet end, and the concentrated water pipe 605 is connected to the waste water end. The concentrated water is discharged through the waste water end. A return water piston column 108 is slidably connected in the annular cover 107 near the cleaning pipe 104, and a water outlet piston column 109 is slidably connected in the annular cover 107 near the water production pipe 103. A water outlet pipe is provided in the water outlet piston column 109, and the cleaning liquid flows out from here. The outflowing cleaning liquid flows back to the return water piston column 108 after passing through the RO membrane 102. The return water piston column 108 is provided with a liquid The discharge pipe is connected to the housing 101 with a clamping assembly, which drives the return water piston column 108 and the outlet water piston column 109 to move toward the RO membrane 102 and press on the two ends of the RO membrane 102. When the return water piston column 108 and the outlet water piston column 109 are clamped at the two ends of the RO membrane 102, the RO membrane 102 will be isolated from the external pipeline to prevent the concentrated water, raw water, etc. in other pipelines from affecting the RO membrane 102. The return water piston column 108 is connected to the waste water pipeline 607 inside and outside, and the outlet water piston column 109 is connected to the pure water pipeline inside and outside. A rotating assembly is rotatably connected to the return water piston column 108, and the rotating assembly is connected to the rotating tube 105; During use, if the rotating tube 105 sprays water toward the four sides of the RO membrane 102, the flow area increases, so that the flow rate of the water flowing in the RO membrane 102 decreases. Through the evenly distributed strip grooves 106, the water flow can be converged at three places, which has the effect of increasing the flow rate of the cleaning liquid and improving the ability to flush impurities.

[0028] Since the RO filter element 100 is connected to a variety of pipes, there are different liquids in the pipes. These liquids will affect the cleaning of the RO membrane 102. At the same time, when it is not used for a long time, it will also affect the pure water in the RO membrane 102 due to osmotic pressure. The following provides a structure that reduces the impact on the internal pure water during cleaning. At the same time, it can block the impact of the liquid in the external pipe on the RO membrane 102 when it is not used for a long time: Figure 3 and Figure 4, the two ends of the housing 101 are connected to a first screen 201, which is in contact with the RO membrane 102. The liquid will enter the RO membrane 102 or come out of the RO membrane 102 after passing through the first screen 201. The end of the return piston column 108 and the outlet piston column 109 close to the RO membrane 102 is connected to a second screen 202, which corresponds to the first screen 201. The second screen 202 and the first screen 201 are both provided with three coaxial annular grooves 203, and the size and position of the annular grooves 203 are the same. A sealing ring is connected to the second screen 202, and a sealing ring is provided on the outside of each annular groove 203. When the first screen 201 and the second screen 202 are pressed together, the sealing ring plays a sealing role to prevent the liquid from leaking into the gap between the first screen 201 and the second screen 202; A cavity 204 is provided inside the return piston column 108 and the discharge piston column 109. The diameter of the cavity 204 is larger than the maximum diameter of the annular groove 203 because the annular groove 203 has multiple groups and is larger than the diameter of the outermost layer. A baffle 205 is slidably connected to the cavity 204. When the baffle 205 moves to one end close to the RO membrane 102, it will cover the entrance of the cavity 204. At this time, the liquid in the annular cover 107 cannot enter the cavity 204. A flushing pipe 206 is connected to the water outlet piston column 109, and a return pipe 207 is connected to the return piston column 108. The flushing pipe 206 is used to flow out the cleaning liquid, and the return pipe 207 is used to recover the cleaning liquid after use. The flushing pipe 206 and the return pipe 207 are both connected to the edge of the baffle 205. The flushing pipe 206 and the return pipe 207 are staggered with the annular groove 203. When the baffle 205 contacts the second baffle 202, the opening of the flushing pipe 206 or the return pipe 207 is blocked, thereby blocking the flow of water. When it is away from the second baffle 202, the pipe opening will be exposed, and at this time it will be connected to the cavity 204. One end of the flushing pipe 206 and the return pipe 207 both extend out of the annular cover 107. At this time, when the return piston column 108 or the outlet piston column 109 moves in the annular cover 107, it will not affect the flushing pipe 206 or the return pipe 207. The baffle 205 is externally connected to a telescopic device to push the baffle 205 to move in the cavity 204. The baffle 205 in the cavity 204 is pushed to move through the external telescopic device.

[0029] Figure 12 This is a schematic diagram of water production, the first cleaning step, and the second cleaning step. The black lines in the figure are the flow direction of the liquid. Figure 12During the first cleaning step and the liquid flow state during the second cleaning step, when in use, the return piston column 108 and the outlet piston column 109 cover the two ends of the RO membrane 102, and the first cleaning step is performed first; the baffle 111 in the return piston column 108 is opened, and the entrance of the return pipe 207 is exposed. At this time, the cleaning liquid flows out of the cleaning pipe 104, and after entering the RO membrane 102, it will flow toward the return piston column 108. Because the baffle 111 in the outlet piston column 109 is not opened, the cleaning liquid will not flow toward the outlet piston column 109. The liquid flowing toward the return piston column 108 will flush the impurities in the RO membrane 102, and then enter the cavity 204 and flow out from the return pipe 207.

[0030] When in use, only the fixed position in the RO membrane 102 can be flushed, and there is a dead corner for flushing. Moreover, the area of ​​the water outlet of the RO membrane 102 is large, and the liquid coming out is too dispersed, resulting in a reduced flow rate and an ineffective cleaning effect. The following provides a structure that can rotate and clean and reduce the size of the water outlet of the RO membrane 102: Specifically, refer to Figures 4 to 6 The rotating assembly includes a rotating disk 110 and a baffle 111 rotatably connected to the cavity 204. The baffle 111 is provided with a plurality of return water grooves 112 arranged at equal intervals. There are three groups of return water grooves 112, which are the same as the number of strip grooves 106. Each group of return water grooves 112 and the strip grooves 106 are located on the same plane. At this time, the cleaning liquid flowing out of the strip grooves 106 passes through the RO membrane 102 and directly enters the cavity 204 from the return water grooves 112. The flow state is referenced Figure 4 Each set of the return water grooves 112 corresponds to the size of the annular groove 203, and the rotating disk 110 is provided with three sets of coaxially arranged water holes 113, and the three sets of the water holes 113 are staggered.

[0031] refer to Figure 5 The water holes 113 include three groups of inner rings 114, middle rings 115, and outer rings 116. The inner rings 114, middle rings 115, and outer rings 116 are arranged in a staggered manner. When the rotating disk 110 and the baffle 111 are put together, the return groove 112 on the baffle 111 will reveal one of the hole grooves of the water holes 113. When the rotating disk 110 rotates, the next hole groove of the water holes 113 will be revealed. For example, when the baffle 111 is covered on the rotating disk 110, the inner ring 114 is revealed. When the rotating disk 110 rotates, the middle ring 115 is revealed. When the rotating disk 110 rotates again, the outer ring 116 is revealed, and this cycle repeats. Liquid can enter the cavity 204 through the revealed hole grooves and then be discharged from the return pipe 207 in the cavity 204.

[0032] Through the rotation of the rotating disk 110, the RO membrane 102 is first flushed from the inner area, then the middle area, and finally the outer area. It has the ability to clean in batches, so that the cleaning liquid can flow toward a specific area and flow out from a designated position, thereby improving the impact ability on impurities and improving the cleaning efficiency.

[0033] The rotating disk 110 is externally connected to a rotation drive assembly. Since the baffle 111 and the strip groove 106 are located on the same plane, they need to maintain synchronous rotation. The baffle 111 and the rotating tube 105 are externally connected to the same rotation drive assembly.

[0034] The reason for not introducing the cleaning liquid into the middle position, making the cleaning liquid flow to both ends, and finally spraying the cleaning liquid from both ends is: the raw water flows from the water inlet end to the concentrated water end, and impurities are intercepted by the microporous structure in the RO membrane 102 during the flow. If the cleaning liquid is introduced from the middle, then part of the cleaning liquid will flow in the same direction as the raw water, and the impurities intercepted by the microporous structure will remain in the intercepted state and will not be separated from the microporous structure due to the reverse flow of the liquid, which will affect the cleaning effect.

[0035] The return piston column 108 and the outlet piston column 109 need to move simultaneously so as to keep the cover on both ends of the RO membrane 102 sealed. In order to avoid the asynchronous situation, a clamping assembly is provided below: Figure 7 and Figure 13 The clamping assembly includes a connecting frame 301 located at both ends of the housing 101. The connecting frame 301 is Y-shaped to avoid interference with the structure of the axis. The connecting frame 301 is connected to a connecting column 302, which passes through the annular cover 107. The water outlet piston column 109 and the water return piston column 108 are both connected to the connecting column 302. The connecting column 302 is connected to a first telescopic rod 303. The first telescopic rod 303, the second telescopic rod 309 and the third telescopic rod 516 are preferably electric telescopic rods. The end of the first telescopic rod 303 is connected to the baffle 205, and the first telescopic rod 303 pushes the baffle 205 in the cavity 204 to move, thereby realizing the closing and opening of one end of the flushing pipe 206 or the return pipe 207 on the baffle 205. When the baffle 205 is pressed on the inner wall of the cavity 204, the pipe mouth will be blocked, that is, it is in a closed state; the initial state of the first telescopic rod 303 is extended, at this time the baffle 205 is in contact with the cavity 204, and the pipe mouth of the flushing pipe 206 or the return pipe 207 is blocked.

[0036] The outer surface of the housing 101 is provided with a frame 304, Figure 1 The frame 304 is a supporting structure used to fix the RO filter element 100, booster pump and other structures. Larger structures such as the pressure tank 601 are not placed on it. Figure 7 and Figure 13The frame 304 is rotatably connected to a crankshaft 305, which is provided with two cranks. The crankshaft 305 rotates back and forth when rotating. The crankshaft 305 is located in the middle of the housing 101 and the frame 304, so that the distance between the return piston column 108 and the outlet piston column 109 at both ends is the same. When the crankshaft 305 rotates, the return piston column 108 and the outlet piston column 109 at both ends are synchronously pulled toward the middle through the connecting rod 306 to keep the same moving distance. Figure 13 At this time, the crankshaft 305 is in the initial position, that is, the return water piston column 108 and the outlet water piston column 109 are located away from the RO membrane 102. When the crankshaft 305 rotates, it will rotate in the direction of the black arrow. During the rotation, the connecting frame 301 is pulled toward the middle position through the connecting rod 306. The angle with the vertical plane after rotation is the same as the angle with the initial angle and the vertical plane, so there is no dead angle problem. The crankshaft 305 is an existing mature device and will not be described in detail here. The connecting frame 301 and the crank of the crankshaft 305 are rotatably connected with a connecting rod 306. When the crankshaft 305 rotates, the connecting frames 301 at both ends are driven to move toward the middle through the connecting rod 306. The rotation of the crankshaft 305 drives the connecting frames 301 at both ends to move toward the middle position. A guide frame 307 is connected to the housing 101. The connecting frame 301 is slidably connected to the guide frame 307. The guide frame 307 is used to stabilize the connecting frame 301. Axial movement, the other end of the crankshaft 305 is connected to the driving frame 308, and the frame body 304 is rotatably connected to the second telescopic rod 309. The end of the second telescopic rod 309 away from the protruding end is rotatably connected to the frame body 304, and the output end of the second telescopic rod 309 is rotatably connected to the driving frame 308. The crankshaft 305 is rotated by the driving frame 308. When the protruding end of the second telescopic rod 309 is extended, the crankshaft 305 is driven to rotate through the driving frame 308, and the rotating shaft of the crankshaft 305 is rotatably connected to the frame body 304.

[0037] The rotating tube 105 and the baffle 111 need to keep rotating synchronously. Since there is a cleaning tube 104 between the baffle 111 and the rotating tube 105, they cannot be set together. The following provides a structure for driving the rotating tube 105 and the baffle 111 to rotate at the same time: Figure 3A first rotating shaft 401 is provided on the outside of the cleaning pipe 104, and a first gear 402 is connected to the first rotating shaft 401. The number of the first gears 402 corresponds to the second gear 403 and is engaged with the first gear 403. The end of the baffle 111 away from the RO membrane 102 and the outer wall of the cleaning pipe 104 are both rotatably connected with the second gear 403. Specifically, one end of the rotating tube 105 is connected to a rotating shaft extending out of the cleaning pipe 104, and the rotating shaft is connected to the second gear 403. The first gear 402 and the second gear 403 are engaged with each other. The first rotating shaft 401 is externally connected to a driving structure, and the external driving structure drives the first rotating shaft 401 to rotate, and then the engagement of the first gear 402 and the second gear 403 drives the rotation of the rotating tube 105 and the baffle 111. A telescopic component is connected between the baffle 111 and the second gear 403.

[0038] To prevent the rotation of the rotating tube 105 from affecting the normal flow of water into the cleaning tube 104, refer to Figures 3 to 5 The end of the cleaning pipe 104 away from the RO membrane 102 is connected to the pure water inlet pipe 406, and the end of the rotating pipe 105 close to the pure water inlet pipe 406 is provided with a hole groove for water flow. Figure 4 At the far left end, pure water enters the rotating tube 105 through the holes.

[0039] In one embodiment, reference Figure 14 The outer wall of the cleaning pipe 104 is rotatably connected to a second gear 403, which is connected to a baffle 111 through a telescopic assembly. The other end of the baffle 111 is connected to an end cap 610, which is connected to the rotating tube 105 in the cleaning pipe 104. When the second gear 403 rotates, the baffle 111 and the rotating tube 105 can be driven to rotate synchronously. When the first gear 402 drives the second gear 403 to rotate, the baffle 111 and the rotating tube 105 can be driven to rotate simultaneously. The end cap 610 is rotatably connected to a pure water inlet pipe 406, which is connected by a rotating sealing connector, such as a rotary joint, a flexible joint, etc., which can be achieved by existing devices and will not be described in detail here. In order to prevent the pure water inlet pipe 406 from rotating, a fixed structure is connected between the fixed pipe 501 and the pure water inlet pipe 406. It has the function of keeping the baffle 111 and the rotating tube 105 rotating synchronously, while not affecting the entry of the cleaning liquid and shortening the length of the equipment.

[0040] The first rotating shaft 401 requires a stable supporting structure to ensure stable rotation. The following provides a supporting structure: Figure 8 and Figure 9 The outside of the cleaning tube 104 is provided with a fixed tube 501, which is coaxially arranged. The fixed tube 501 is connected to the annular cover 107. The fixed tube 501 is connected to a rotating shaft frame 502, which plays a supporting role; Figure 3 Only the end close to the return piston column 108 is connected to the fixed tube 501. This end is equipped with structures such as the rotating tube 105, the rotating disk 110, and the baffle 111, and needs to be supported. The end close to the water outlet piston column 109 only needs to control the opening and closing of the baffle 205 in the cavity 204, so only the connecting frame 301 and the water outlet piston column 109 are provided. The baffle 205 is pushed to move in the cavity 204 by the first telescopic rod 303 in the connecting column 302. When opened and closed, cleaning liquid, that is, pure water, flows out. When closed, the water flow is blocked. The cleaning liquid can be the pure water produced by the equipment, or it can be external cleaning water.

[0041] A reduction motor 503 is connected to the annular cover 107 near the fixed tube 501. In one embodiment, the reduction motor 503 is a servo motor. The output end of the reduction motor 503 is connected to the second rotating shaft 504. The fixed tube 501 is provided with a support structure for supporting the second rotating shaft 504 to improve stability during rotation. The second rotating shaft 504 is connected to a third gear 505. The end of the fixed tube 501 away from the annular cover 107 is rotatably connected to a fourth gear 506. The fourth gear 506 is rotatably connected to one end of the fixed tube 501. The third gear 505 and the fourth gear 506 are meshed and connected. A telescopic component is connected between the rotating disk 110 and the fourth gear 506. The telescopic component is a structure that can extend and maintain power transmission. When the rotating disk 110 and the baffle 111 move, the power transmission can be maintained. refer to Figure 6 The telescopic assembly includes an inner spline 404 and an outer spline 405 connected by a spline. The telescopic assembly connected to the rotating disk 110 is sleeved on the outside of the telescopic assembly of the baffle 111, and the two do not affect each other. The outer spline 405 of the telescopic assembly is connected to the rotating disk 110 or the baffle 111, and the inner spline 404 of the telescopic assembly is connected to the second gear 403 or the fourth gear 506. When the gear rotates, the outer spline 405 is driven to rotate by the inner spline 404, and the outer spline 405 drives the rotating disk 110 or the baffle 111 to rotate. When the rotating disk 110 and the baffle 111 move with the return piston column 108, the telescopic assembly will be stretched, and will not affect the rotation of the rotating disk 110 and the baffle 111.

[0042] During use, the rotating tube 105 and the baffle 111 rotate synchronously, and the water flowing out of the strip groove 106 enters the cavity 204 through the return groove 112 on the baffle 111. When the water holes 113 on the rotating disk 110 are aligned with the return groove 112, the water flows through the water holes 113 and enters the cavity 204. For example, when the middle circle 115 is aligned with the return groove 112, the cleaning liquid enters through the middle return groove 112, passes through the middle circle 115, and then enters the cavity 204. The rotating tube 105 and the baffle plate 111 rotate synchronously with the rotating disk 110 until one rotation. At this time, the inner ring 114, the middle ring 115 or the outer ring 116 has been cleaned for a full circle. At this time, the baffle plate 111 and the rotating tube 105 stop rotating, and the rotating disk 110 keeps rotating until it rotates to the position of the next water hole 113, and then rotates synchronously again to perform the next round of cleaning until the inner layer, middle layer and outer layer of the RO filter element 100 are cleaned.

[0043] The rotating disk 110 needs to keep rotating synchronously with the baffle 111, otherwise it will affect the flow of the cleaning liquid and reduce the cleaning effect. The following provides a structure for keeping synchronous rotation: Figure 9 and Figure 10The first rotating shaft 401 has a driven disk 507 connected to one end thereof near the rotating shaft frame 502. A spline sleeve 508 is fixedly connected to one end of the rotating shaft frame 502 near the first rotating shaft 401. The spline sleeve 508 does not rotate on the rotating shaft frame 502, and the first rotating shaft 401 passes through the spline sleeve 508 without contacting the spline sleeve 508. In one embodiment, the spline sleeve 508 is fixedly connected to the rotating shaft frame 502, and the first rotating shaft 401 passes through the spline sleeve 508. The first rotating shaft 401 and the spline sleeve 508 are rotatably connected via a bearing, thereby improving the support capacity for the first rotating shaft 401. The other end of the rotating shaft frame 502 is rotatably connected to the third rotating shaft 509, and the third rotating shaft 509 is connected to the second rotating shaft 504 through a chain transmission assembly 510. When the second rotating shaft 504 rotates, the third rotating shaft 509 is driven to rotate by the chain transmission assembly 510. The chain transmission assembly 510 is composed of a sprocket and a chain structure. This is a mature structure and will not be described in detail here. In one embodiment, the chain transmission assembly 510 is changed to a gear transmission structure; in another embodiment, the chain transmission assembly 510 is changed to a pulley transmission structure. The outer wall of the spline sleeve 508 and the outer wall of the first rotating shaft 401 are spline-connected with a connecting block 511. A spline is provided on one end of the third rotating shaft 509 close to the driven disk 507, which is spline-connected to the connecting block 511 on the outer wall. A rotating member 512 is rotatably connected to the outer ring surface of the connecting block 511 on the third rotating shaft 509. When the chain transmission assembly 510 drives the third rotating shaft 509 to rotate, the spline on the outer wall drives the connecting block 511 to rotate. A support bar frame 513 is connected between the rotating member 512 and the other connecting block 511. The support bar frame 513 is used to connect the two rotating members 5 12. The connecting block 511 is internally slidably connected with a connecting plate 514, and the connecting plate 514 and the driven disk 507 are provided with tooth surfaces 515 that mesh with each other, so as to facilitate connecting the connecting plate 514 and the driven disk 507 together, thereby driving the first rotating shaft 401 to rotate. The connecting plate 514 and the connecting block 511 are connected by a spring. When the rotating member 512 and the driven disk 507 are fitted together, the spring inside the rotating member 512 will push the connecting plate 514 to press on the driven disk 507. At this time, the tooth surface 515 on the connecting plate 514 will mesh with the tooth surface 515 on one side of the driven disk 507.

[0044] When the rotating member 512 on the third rotating shaft 509 is fitted together with the driven disk 507, since the third rotating shaft 509 rotates with the second rotating shaft 504, the driven disk 507 will be driven to rotate through the rotating member 512; when the rotating member 512 on the spline sleeve 508 is fitted together with the driven disk 507, since the spline sleeve 508 is fixedly connected to the rotating shaft frame 502, the driven disk 507 will be restricted and stopped from rotating. By stopping the first rotating shaft 401, the rotating tube 105 and the baffle 111 stop rotating. At this time, the third gear 505 and the fourth gear 506 on the second rotating shaft 504 are still in a meshing state, and the reduction motor 503 can continue to drive the rotating disk 110 to rotate, so that the switching of the water hole 113 on the rotating disk 110 can be completed.

[0045] The rotating shaft frame 502 is connected to a third telescopic rod 516, which drives the two connecting blocks 511 to move, thereby realizing different control states of the driven disk 507. The output end of the third telescopic rod 516 is connected to the support bar frame 513, pushing the support bar frame 513 to move. The support bar frame 513 plays a connecting role and is fixedly connected to the connecting block 511 on the spline sleeve 508, and is rotationally connected to the connecting block 511 on the third rotating shaft 509 through a rotating member 512.

[0046] refer to Figure 11 , Figure 11 Schematic diagram of the RO filter element 100 connected to the clean water pipeline, the clean water pipeline is also connected to a pressure barrel 601. In one embodiment, the material in the pressure barrel 601 is PFA, which reduces the release of organic matter and reduces the TOC content. The pressure barrel 601 is connected to a cleaning water pipe 602, which is used to supply cleaning liquid, i.e., pure water, to the RO filter element 100. The cleaning water pipe 602 is connected to a first three-way valve 603. One interface of the first three-way valve 603 is connected to the cleaning pipe 104 through a water pipe. When the first cleaning step is performed, it is connected to the cleaning pipe 104. The other interface of the first three-way valve 603 is connected to the cleaning pipe 104. The interface is connected to the flushing pipe 206 through a water pipe. When the second step of cleaning is performed, it is connected to the flushing pipe 206. The clean water pipeline is connected to a water valve 609 located at the outlet of the water production pipe 103. The water valve 609 is an electric water valve 609. When cleaning the RO membrane 102, it prevents the pure water from flowing out of the water production pipe 103 and prevents the liquid from flowing into the water production pipe 103. The metal electrode is installed in the pipeline behind the RO filter element 100. By closing the RO membrane 102, it prevents raw water and concentrated water from entering the RO filter element 100 and affecting it. It can avoid the influence of pure water with an increased TDS value on the electrode, and has the function of protecting the electrode.

[0047] The annular cover 107 near the water outlet piston column 109 is connected to a raw water pipe 604, which is connected to the water inlet end of the clean water pipeline. Figure 12 In the top schematic diagram, during water production, raw water enters the RO filter element 100 through the raw water pipe 604, concentrate is discharged from the concentrate pipe 605, and pure water is discharged through the production water pipe 103. The concentrate pipe 605 is connected to the annular cover 107 near the piston column of the return pipe 207. A second three-way valve 606 is connected to the concentrate pipe 605 to control the discharge route of waste water. Used cleaning liquid discharged from the return pipe 207 is discharged through the wastewater pipe 607. One port of the second three-way valve 606 is connected to the return pipe 207 via a pipe, and the other port is connected to the wastewater pipe 607 via a pipe. The wastewater pipe 607 is the wastewater discharge pipe. The cleaning water pipe 602 is connected to a cleaning water pump 608, which pumps pure water from the pressure tank 601 and delivers it to the RO filter element 100. In one embodiment, the second three-way valve 606 is replaced with a one-way valve to prevent liquid backflow.

[0048] A water treatment method for chromatographic water purification equipment comprises the following steps: Step 1: Water production: Raw water enters the water purification pipeline and is initially filtered by the pre-filter element, PP cotton filter element, etc. during the process. Under the action of the booster pump, it enters the RO filter element 100. Pure water flows out of the water production pipe 103 and enters the pressure tank 601 through the pipeline for storage or flows out through another pipeline for use. Concentrated water flows out of the concentrate pipe 605 and is discharged into the wastewater pipe 607. Step 2, first cleaning step: Start the second telescopic rod 309 to move the connecting frames 301 at both ends of the RO filter element 100 toward the middle. The return water piston column 108 and the water outlet piston column 109 press on both ends of the RO membrane 102. Close the water valve 609 to prevent liquid from flowing in the water production pipe 103. Start the first telescopic rod 303 at one end of the return water piston column 108. The first telescopic rod 303 moves with the baffle 205 toward the end away from the RO membrane 102. At this time, the entrance of the return water pipe 207 is exposed. Start the cleaning water pump 608, the first three-way valve 603 and the second three-way valve 606. Pure water enters the rotating tube 105 from the pressure barrel 601. The water entering the RO filter element 100 rinses the front half of the RO membrane 102. The cleaned sewage enters the wastewater pipe 607 from the return water pipe 207.

[0049] Step 3, second cleaning: the first three-way valve 603 switches the pipeline state and activates the first telescopic rod 303 at one end of the water outlet piston column 109. At this time, the nozzle of the flushing pipe 206 in the water outlet piston column 109 is exposed, and pure water enters the flushing pipe 206. The pure water entering the RO filter element 100 flushes the entire RO membrane 102; Step 4, storage: first stop the cleaning water pump 608 and suspend the supply of pure water. The first telescopic rod 303 in the water outlet piston column 109 moves to squeeze the cavity 204 in the water outlet piston column 109 to discharge the pure water inside. The first telescopic rod 303 in the return water piston column 108 moves to squeeze the cavity 204 in the return water piston column 108 to discharge the internal liquid. Finally, reset the first three-way valve 603 and the second three-way valve 606. The return water piston column 108 and the water outlet piston column 109 are always pressed on both ends of the RO membrane 102, so that the liquid in the external pipeline will not affect the RO membrane 102 under the action of osmotic pressure.

[0050] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A chromatographic water purification device, comprising a clean water pipeline and an RO filter element (100) connected to the clean water pipeline, wherein the RO filter element (100) comprises a housing (101) and an RO membrane (102) located within the housing (101), characterized in that: The RO membrane (102) is connected to a coaxially arranged water production pipe (103) and a cleaning pipe (104), the cleaning pipe (104) is provided with a water outlet hole, the cleaning pipe (104) is rotatably connected to a rotating pipe (105), the rotating pipe (105) is provided with circumferentially evenly distributed strip grooves (106) for water outlet, and the end of the cleaning pipe (104) away from the RO membrane (102) is externally connected to a pure water pipeline; An annular cover (107) is connected to both ends of the housing (101), and the annular cover (107) is connected to the clean water pipeline through a water pipe. A return water piston column (108) is slidably connected in the annular cover (107) near the cleaning pipe (104), and a water outlet piston column (109) is slidably connected in the annular cover (107) near the water production pipe (103). A clamping assembly is connected to the housing (101), and the clamping assembly drives the return water piston column (108) and the water outlet piston column (109) to move toward the RO membrane (102) and press on both ends of the RO membrane (102). The return water piston column (108) is connected to the waste water pipeline (607) inside and outside, and the water outlet piston column (109) is connected to the pure water pipeline inside and outside. A rotating assembly is rotatably connected in the return water piston column (108), and the rotating assembly is connected to the rotating pipe (105).

2. A chromatography water purification device according to claim 1, characterized in that: Both ends of the housing (101) are connected to a first retaining net (201), the first retaining net (201) is in contact with the RO membrane (102), and one end of the return piston column (108) and the outlet piston column (109) close to the RO membrane (102) is connected to a second retaining net (202) corresponding to the first retaining net (201), the second retaining net (202) and the first retaining net (201) are both provided with three coaxially arranged annular grooves (203), and the second retaining net (202) is connected to a sealing ring; A cavity (204) is provided inside the return water piston column (108) and the water outlet piston column (109). The diameter of the cavity (204) is larger than the annular groove (203). A baffle (205) is slidably connected inside the cavity (204). A flushing pipe (206) is connected inside the water outlet piston column (109). A return water pipe (207) is connected inside the return water piston column (108). Both the flushing pipe (206) and the return water pipe (207) are connected to the edge of the baffle (205). Both the flushing pipe (206) and the return water pipe (207) are staggered with the annular groove (203). One end of each of the flushing pipe (206) and the return water pipe (207) extends out of the annular cover (107). The baffle (205) is externally connected to a telescopic device to push the baffle (205) to move inside the cavity (204).

3. A chromatography water purification device according to claim 2, characterized in that: The rotating assembly comprises a rotating disk (110) and a baffle (111) rotatably connected to the cavity (204); the baffle (111) is provided with a plurality of groups of return water grooves (112) arranged at equal intervals; each group of the return water grooves (112) and the strip groove (106) are located on the same plane; each group of the return water grooves (112) corresponds in size to the annular groove (203); the rotating disk (110) is provided with three groups of coaxially arranged water holes (113); the three groups of the water holes (113) are staggered; The rotating disk (110) is externally connected to a rotation drive structure, and the baffle (111) and the rotating tube (105) are externally connected to the same rotation drive structure.

4. A chromatography water purification device according to claim 3, characterized in that: The clamping assembly comprises a connecting frame (301) located at both ends of the housing (101), a connecting column (302) being connected to the connecting frame (301), the water outlet piston column (109) and the water return piston column (108) being connected to the connecting column (302), a first telescopic rod (303) being connected inside the connecting column (302), and the end of the first telescopic rod (303) being connected to the baffle (205); A frame (304) is provided on the outside of the housing (101), and a crankshaft (305) is rotatably connected to the frame (304). A connecting rod (306) is rotatably connected between the connecting frame (301) and the crank of the crankshaft (305). The rotation of the crankshaft (305) drives the connecting frames (301) at both ends to move toward the middle position. A guide frame (307) is connected to the housing (101), and the connecting frame (301) is slidably connected to the guide frame (307). The other end of the crankshaft (305) is connected to a driving frame (308). A second telescopic rod (309) is rotatably connected to the frame (304), and the output end of the second telescopic rod (309) is rotatably connected to the driving frame (308). The crankshaft (305) is rotated by the driving frame (308).

5. The chromatographic water purification device according to claim 4, characterized in that: A first rotating shaft (401) is provided on the outside of the cleaning tube (104), and a first gear (402) is connected to the first rotating shaft (401). The end of the baffle (111) away from the RO membrane (102) and the outer wall of the cleaning tube (104) are both rotatably connected to a second gear (403). The first gear (402) and the second gear (403) are meshed and connected. The first rotating shaft (401) is externally connected to a driving structure, and a telescopic component is connected between the baffle (111) and the second gear (403).

6. The chromatographic water purification device according to claim 5, characterized in that: A fixed tube (501) is provided on the outside of the cleaning tube (104), the fixed tube (501) is connected to the annular cover (107), and a rotating shaft frame (502) is connected to the fixed tube (501); A reduction motor (503) is connected to the annular cover (107) near the fixed tube (501), an output end of the reduction motor (503) is connected to a second rotating shaft (504), a third gear (505) is connected to the second rotating shaft (504), an end of the fixed tube (501) away from the annular cover (107) is rotatably connected to a fourth gear (506), the third gear (505) and the fourth gear (506) are meshed and connected, and a telescopic assembly is connected between the rotating disk (110) and the fourth gear (506); The telescopic assembly comprises an inner spline (404) and an outer spline (405) connected in a spline manner.

7. The chromatographic water purification device according to claim 6, characterized in that: One end of the first rotating shaft (401) close to the rotating shaft frame (502) is connected to a driven disk (507), one end of the rotating shaft frame (502) close to the first rotating shaft (401) is fixedly connected to a spline sleeve (508), and the other end of the rotating shaft frame (502) is rotatably connected to a third rotating shaft (509), and the third rotating shaft (509) and the second rotating shaft (504) are connected via a chain transmission assembly (510), and the outer wall of the spline sleeve (508) and the outer wall of the first rotating shaft (401) are both spline-connected. A connecting block (511), a rotating member (512) is rotatably connected to the outer ring surface of the connecting block (511) located on the third rotating shaft (509), a support frame (513) is connected between the rotating member (512) and another connecting block (511), a connecting plate (514) is slidably connected to the interior of the connecting block (511), and tooth surfaces (515) that mesh with each other are provided on the connecting plate (514) and the driven disk (507), and the connecting plate (514) and the connecting block (511) are connected via a spring; A third telescopic rod (516) is connected to the rotating shaft frame (502), and an output end of the third telescopic rod (516) is connected to the supporting bar frame (513) to push the supporting bar frame (513) to move.

8. The chromatographic water purification device according to claim 7, characterized in that: The clean water pipeline is also connected to a pressure barrel (601), the pressure barrel (601) is connected to a cleaning water pipe (602), the cleaning water pipe (602) is connected to a first three-way valve (603), one interface of the first three-way valve (603) is connected to the cleaning pipe (104) through a water pipe, and the other interface of the first three-way valve (603) is connected to the flushing pipe (206) through a water pipe. The clean water pipeline is connected to a water valve (609) located at the outlet of the water production pipe (103).

9. The chromatographic water purification device according to claim 8, characterized in that: A raw water pipe (604) is connected to the annular cover (107) near the water outlet piston column (109), and the raw water pipe (604) is connected to the water inlet end of the clean water pipeline. A concentrated water pipe (605) is connected to the annular cover (107) near the piston column of the return water pipe (207), and the concentrated water pipe (605) is connected to a second three-way valve (606). One interface of the second three-way valve (606) is connected to the return water pipe (207) through a pipeline, and the other interface is connected to the waste water pipeline (607) through a pipeline. A cleaning water pump (608) is connected to the cleaning water pipe (602).

10. A water treatment method using the chromatographic water purification equipment according to claim 9, characterized in that: The following steps are involved: Step 1: Water production: Raw water enters the water purification pipeline and enters the RO filter element (100) under the action of the booster pump. Pure water flows out of the water production pipe (103) for use, and concentrated water flows out of the concentrated water pipe (605) and is discharged into the wastewater pipe (607). Step 2, first cleaning step: start the second telescopic rod (309), the return water piston column (108) and the water outlet piston column (109) are pressed on both ends of the RO membrane (102), close the water valve (609) and start the first telescopic rod (303) at one end of the return water piston column (108), at this time the inlet of the return water pipe (207) is exposed, start the cleaning water pump (608), the first three-way valve (603) and the second three-way valve (606), pure water enters the rotating tube (105) from the pressure barrel (601), and the front half of the RO membrane (102) is rinsed, and the cleaned sewage enters the wastewater pipe (607) from the return water pipe (207); Step 3, second cleaning: the first three-way valve (603) switches the pipeline state, starts the first telescopic rod (303) at one end of the water outlet piston column (109), and pure water enters the flushing pipe (206) to flush the entire RO membrane (102); Step 4, storage: Reset the structure except for the second telescopic rod 309. The return piston column (108) and the outlet piston column (109) are always pressed on the two ends of the RO membrane (102). The internal baffle (205) and the cavity (204) are in a fit state. The liquid in the external pipeline cannot enter the RO membrane (102) and affect it.

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