A multi-stage filtering device for pure water treatment

Abstract

The application discloses a kind of multistage filter equipment for pure water treatment, it is related to pure water preparation technical field, including filter component and reverse osmosis purification component, the filter component includes filter tank, the inside circumference of filter cavity is equipped with several filter screen barrels, the one end of filter screen barrel is symmetrically rotatably provided with rotating baffle, the rotating baffle is rotatably arranged in the drain outlet of fixed pipe, and the inside circumference of filter cavity is equipped with several filter screen barrels.The filter screen barrel is rotatably arranged in the drain outlet of fixed pipe, and the inside circumference of filter cavity is equipped with several filter screen barrels.The filter screen barrel is rotatably arranged in the drain outlet of fixed pipe, and the inside circumference of filter cavity is equipped with several filter screen barrels.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pure water preparation, and particularly relates to a multi-stage filtering equipment for pure water treatment. BACKGROUND

[0002] The pure water treatment technology has important applications in the fields of electronic industry, pharmaceutical manufacturing, laboratory analysis and food processing, and the core goal is to obtain high-purity water quality by removing ions, microorganisms, particulate matter and organic matter and other impurities in water. The traditional multi-stage filtering equipment usually adopts a combined process of pretreatment, reverse osmosis, ion exchange resin and post-stage fine filtration, wherein the pretreatment filtering process is an important link of pure water preparation, otherwise the impurities in the water can easily cause the reverse osmosis membrane to be blocked and fail. The existing filtering device is blocked by impurities after a period of use, causing poor water discharge and affecting the filtering effect. If the filtering components need to be cleaned, the filtering device needs to stop running, thereby causing the pure water manufacturing to stop, resulting in the inability to continuously prepare and process.

[0003] The authorized announcement No. CN117942656B discloses a multi-stage filtering pure water preparation equipment and a use method thereof. The pure water preparation equipment realizes continuous filtering and backwashing synchronous operation through the linkage of the cover body and the multi-layer filter screen cylinder. When the rotating cover body closes the water hole of the filter cylinder to be cleaned, the remaining filter cylinders normally work. After the backwashing is started, the cover body moves to trigger the standby filter cylinder to be used, so as to ensure the stability of the number of filtering units.

[0004] However, when the filter screen cylinder is cleaned, the filter screen cylinder is open, so that irregular backwashing is performed during backwashing drainage, thereby causing part of the area to be backwashed and the remaining part not to be cleaned. In this process, a large amount of liquid needs to be discharged, thereby causing the water outlet pressure to be greatly reduced. During the drainage, liquid is discharged at the rotating pipe and the water outlet pipe, so that the water is divided into two parts. At this time, the remaining filter screen cylinder bottom end is not closed for backwashing cleaning. In the above preparation equipment, only one cover body is arranged, so that the problem of impurities entering the lower chamber and being unable to be discharged and cleaned occurs during each cleaning.

[0005] Therefore, the present application provides a multi-stage filtering equipment for pure water treatment, which can eliminate the drawbacks of the existing device. SUMMARY

[0006] The present application aims to provide a multi-stage filtering equipment for pure water treatment to solve the problem of uneven cleaning of the filter screen cylinder in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] The application discloses a multi-stage filtering device for pure water treatment, which comprises filtering components and a reverse osmosis purification component, wherein the filtering component comprises a filtering tank, a first partition plate and a second partition plate are fixedly arranged in the filtering tank, a filtering cavity is formed between the upper end of the first partition plate and the upper end of the filtering tank, a water inlet cavity is formed between the bottom end of the first partition plate and the upper end of the second partition plate, a plurality of filtering screen barrels are arranged in the filtering cavity in a circumferential array, a communication pipe is communicated with one end of each filtering screen barrel, the communication pipe is fixedly arranged in a mounting hole in the upper end of the first partition plate, a fixing pipe is fixedly arranged at a position coaxial with the filtering screen barrel in the filtering cavity, a water outlet is arranged on the fixing pipe, a cleaning mechanism for cleaning impurities in the filtering screen barrels is arranged in the water inlet cavity, and a sealing mechanism for sealing the inside of the fixing pipe is arranged in the water outlet on one side of the fixing pipe.

[0009] Based on the above technical scheme, the application further provides the following optional technical schemes.

[0010] In an optional scheme, water outlet pipes and water inlet pipes are communicated with the filtering cavity and the water inlet cavity on the filtering tank respectively, the filtering components are fixedly arranged on the upper end of the mounting table, the filtering components are communicated through the first connecting pipes, the water outlet pipe on one filtering component is communicated with the third connecting pipe at the end, and the other end of the third connecting pipe is communicated with the input end of the reverse osmosis purification component.

[0011] In an optional scheme, the cleaning mechanism comprises a scraping rod and a connecting cover, the scraping rod is tightly arranged on the inner wall of the filtering screen barrel, a plurality of connecting rods are fixedly arranged on one side of the scraping rod, the other end of the connecting rod is fixedly arranged on the first rotating shaft, one end of the first rotating shaft is rotatably arranged on the upper end in the filtering screen barrel, the other end of the first rotating shaft is rotatably provided with a supporting frame, the supporting frame is fixedly arranged in the communication pipe, a transmission pipe is communicated with the connecting cover, the other end of the transmission pipe is communicated with a sliding pipe, a rotating pipe is slidably sleeved on one end of the sliding pipe, one end of the rotating pipe extends to the outside of the filtering tank, a second blowdown pipe is rotatably communicated with one end of the rotating pipe, a driven gear is fixedly arranged on one end of the rotating pipe, a driving gear is meshed with the driven gear and fixedly arranged on the output end of the first motor, the first motor is fixedly arranged on the bottom end of the filtering tank, the connecting cover and the communication pipe are slidably sleeved with each other, and the connecting cover and the sliding pipe are internally provided with a driving assembly for driving the first rotating shaft to rotate.

[0012] In an optional manner, the driving assembly comprises a friction recess wheel, the friction recess wheel is internally frictionally matched with a friction convex wheel, one end of the first rotating shaft is fixedly provided with the friction convex wheel, the friction recess wheel is fixedly arranged at one end of a fixed shaft, the fixed shaft is rotatably arranged in the mounting hole at the upper end of a fixed box, the other end of the fixed shaft is fixedly provided with a first bevel gear, the first bevel gear is meshingly arranged with a second bevel gear, the second bevel gear is fixedly arranged at one end of a transmission shaft, the transmission shaft is rotatably arranged in the mounting hole at one side of the fixed box, the other end of the transmission shaft is fixedly provided with a third bevel gear, the third bevel gear is meshingly arranged with a fourth bevel gear, the fourth bevel gear is fixedly arranged at one end of a second rotating shaft, the other end of the second rotating shaft extends to the outside of the filter tank, a sealing inclined plate is rotatably arranged on the transmission shaft, the sealing inclined plate is fixedly arranged in the inside of a sliding pipe, the fixed box is fixedly arranged at the bottom end of the inside of a connecting cover, a sliding push rod is rotatably arranged at the outside of the second rotating shaft, one end of the sliding push rod is rotatably arranged at the upper end of the sliding pipe, one end of the sliding push rod extends to the outside of the filter tank, the other end of the second rotating shaft is fixedly provided with an external spline shaft, the external spline shaft is matched with an internal spline shaft, the internal spline shaft is fixedly arranged at the output end of a second motor, the second motor is fixedly arranged at the upper end of the inside of a fixed frame, the fixed frame is fixedly arranged at the upper end of the filter tank, the other end of the sliding push rod is fixedly provided with a connecting plate, the connecting plate is fixedly connected with the output ends of two electric cylinders at both ends, respectively, the electric cylinders are fixedly arranged at the upper end of the inside of the fixed frame.

[0013] In an optional manner, one end of the second blowdown pipe is communicated with a second valve, the filter tank is communicated with a first blowdown pipe at the inlet cavity, one end of the first blowdown pipe is communicated with a second connecting pipe, one end of the second connecting pipe is communicated with a first valve, one end of the second connecting pipe and the second blowdown pipe is communicated with the input end of an external liquid pumping component.

[0014] In an optional manner, the sealing mechanism comprises a rotating baffle, the rotating baffles are symmetrically arranged in the inside of the drain port, the rotating shafts at both ends of the rotating baffles are rotatably arranged in the mounting holes in the inside of the drain port, the rotating shafts at one end of the rotating baffles extend to the inside of the inlet cavity, the rotating shafts at one end of the rotating baffles are provided with fixed columns, the fixed columns are provided with spiral grooves, the spiral grooves are slidably arranged with guide columns, the guide columns are fixedly arranged in the inside of sleeve pipes, the sleeve pipes are sleeved with the fixed columns at one end, the sleeve pipes are fixedly provided with extension plates at one end, the extension plates are slidably arranged with guide sliding rods, the guide sliding rods are fixedly arranged at the bottom end of the first partition plate, a connecting plate is fixedly arranged between the sleeve pipes on the same side, a jacking rod is fixedly arranged on the connecting plate at a position corresponding to the connecting plate on the outside of the connecting cover, the filter screen barrels are fixedly arranged with backflush discs at the upper end in the inside, the backflush discs are provided with filter screens at the bottom end, the backflush discs are communicated with reflux pipes in the inside, the reflux pipes extend to the outside of the fixed pipes at one end.

[0015] In an alternative: the bottom end of the filter screen is closely provided with a cleaning rod, and the cleaning rod is fixedly arranged at one end of the scraping rod.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1、The present application sets several filter screen barrels, thereby filtering raw water in multiple stages, and sets a first partition plate and a second partition plate inside the filter tank, so as to divide the filter tank into a water inlet cavity and a filter cavity, sets four filter screen barrels inside the filter cavity, and when filtering, a connecting cover closes one end of one filter screen barrel, so that when the remaining filter screen barrels are blocked, the connecting cover can be switched and rotated, and the unused filter screen barrel works, thereby ensuring continuous filtering of raw water.

[0018] 2、The present application sets a fixed pipe outside each filter screen barrel, and sets a rotating baffle symmetrically and rotatably in the drain port, so that when the impurities attached to the inside of the filter screen barrel are cleaned, the inside of the fixed pipe is closed, and when the sewage is discharged, the discharge of raw water in the filter cavity can be reduced, and the inside of the fixed pipe can be fully cleaned by setting a scraping rod, and the inside of the fixed pipe can be replaced by raw water in the filter cavity when the sewage is discharged, and the impurities can be pushed out, thereby increasing the practicality of the multi-stage pure water filtering equipment. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the present application.

[0020] Figure 2 It is a structural schematic view of the filter tank of the present application.

[0021] Figure 3 It is an installation schematic view of the first partition plate and the second partition plate of the present application.

[0022] Figure 4 It is a structural schematic view of the filter screen barrel of the present application.

[0023] Figure 5 It is an installation schematic view of the connecting cover and the sliding pipe of the present application.

[0024] Figure 6 It is a structural schematic view of the fixed column of the present application.

[0025] Figure 7 It is a structural schematic view of the backflushing disc of the present application.

[0026] Figure 8 It is an installation schematic view of the rotating baffle of the present application.

[0027] 11 filtering component, 12 reverse osmosis purification component, 13 first connecting pipe, 14 second connecting pipe, 15 first valve, 16 second valve, 17 filtering tank, 18 first partition plate, 19 second partition plate, 20 water inlet pipe, 21 water outlet pipe, 22 first blowdown pipe, 23 filtering screen cylinder, 24 fixed pipe, 25 rotating baffle, 26 scraping rod, 27 first rotating shaft, 28 connecting cover, 29 sliding pipe, 30 rotating pipe, 31 second blowdown pipe, 32 driven gear, 33 first motor, 34 friction cam, 35 friction concave cam, 36 transmission shaft, 37 second rotating shaft, 38 inner spline shaft, 39 second motor, 40 sliding push rod, 41 electric cylinder, 42 fixed column, 43 helical groove, 44 guide column, 45 sleeving pipe, 46 jacking rod, 47 backflushing disc, 48 backflow pipe. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments.

[0029] In one embodiment, as shown in Figures 1-8 a multi-stage filtering device for pure water treatment, comprising a filtering component 11 and a reverse osmosis purification component 12, the filtering component 11 comprises a filtering tank 17, the filtering tank 17 is internally fixedly provided with a first partition plate 18 and a second partition plate 19, the upper end of the first partition plate 18 and the upper end of the filtering tank 17 internally combine to form a filtering cavity, the bottom end of the first partition plate 18 and the upper end of the second partition plate 19 combine to form a water inlet cavity, the filtering tank 17 is provided with a water outlet pipe 21 and a water inlet pipe 20 at positions corresponding to the filtering cavity and the water inlet cavity, respectively, a plurality of filtering screen cylinders 23 are arranged in an array on the inner circumference of the filtering cavity, the filtering screen cylinders 23 are each provided with a connecting pipe, the connecting pipe is fixedly arranged in a mounting hole in the upper end of the first partition plate 18, the filtering cavity is internally fixedly provided with a fixed pipe 24 coaxially with the filtering screen cylinders 23, the fixed pipe 24 is provided with a drain hole, the water inlet cavity is internally provided with a cleaning mechanism for cleaning impurities in the plurality of filtering screen cylinders 23, the fixed pipe 24 is internally provided with a sealing mechanism for sealing the inside of the fixed pipe 24 at one side of the drain hole, the cleaning mechanism facilitates the cleaning and discharge of impurities filtered out from the plurality of filtering screen cylinders 23, and the sealing mechanism can seal the inside of the fixed pipe 24;

[0030] A plurality of said filter components 11 are fixedly arranged on the upper end of the mounting table, a plurality of said filter components 11 are communicated through the first connecting pipe 13, the end of the water outlet pipe 21 of one said filter component 11 is communicated with the third connecting pipe, the other end of the third connecting pipe is communicated with the input end of the reverse osmosis purification component 12, when producing pure water, the water inlet pipe 20 of the outermost filter component 11 is communicated with the output end of the external liquid supply component, then the raw water enters the water inlet cavity, then the raw water enters the filter cavity through the filter screen cylinder 23, the filtered raw water is discharged through the water outlet pipe 21, enters the next filter component 11 through the first connecting pipe 13, and is filtered in multiple stages, and the raw water is filtered through the last filter component 11 and enters the reverse osmosis purification component 12 for reverse osmosis purification, it is worth noting that the reverse osmosis purification component 12 in the application adopts an existing component, the specific structure and working principle are known, and will not be described here.

[0031] The cleaning mechanism includes a scraper 26 and a connecting cover 28, the inner wall of the filter screen cylinder 23 is tightly provided with a scraper 26, one side of the scraper 26 is fixedly provided with a plurality of connecting rods, the other end of the connecting rod is fixedly arranged on the first rotating shaft 27, one end of the first rotating shaft 27 is rotatably arranged on the upper end of the filter screen cylinder 23, the other end of the first rotating shaft 27 is rotatably provided with a support frame, the support frame is fixedly arranged in the communicating pipe, the connecting cover 28 is communicated with a transmission pipe, the other end of the transmission pipe is communicated with a sliding pipe 29, one end of the sliding pipe 29 is slidably sleeved with a rotating pipe 30, one end of the rotating pipe 30 extends to the outside of the filter tank 17, one end of the rotating pipe 30 is rotatably communicated with a second blowdown pipe 31, one end of the rotating pipe 30 is fixedly provided with a driven gear 32, the driven gear 32 is meshed with a driving gear, the driving gear is fixedly arranged on the output end of the first motor 33, the first motor 33 is fixedly arranged on the bottom end of the filter tank 17, the connecting cover 28 and the communicating pipe are slidably sleeved and matched, the connecting cover 28 and the sliding pipe 29 are provided with a driving assembly for driving the first rotating shaft 27 to rotate.

[0032] The driving assembly comprises a friction recess wheel 35, a friction convex wheel 34 is arranged inside the friction recess wheel 35 in a friction fit, the first rotating shaft 27 is fixed with the friction convex wheel 34 at one end, the friction recess wheel 35 is fixed at one end of a fixed shaft, the fixed shaft is rotatably arranged in the mounting hole at the upper end of a fixed box, a first bevel gear is fixed at the other end of the fixed shaft, a second bevel gear is arranged in mesh with the first bevel gear, the second bevel gear is fixed at one end of a transmission shaft 36, the transmission shaft 36 is rotatably arranged in the mounting hole at one side of the fixed box, a third bevel gear is fixed at the other end of the transmission shaft 36, a fourth bevel gear is arranged in mesh with the third bevel gear, the fourth bevel gear is fixed at one end of a second rotating shaft 37, the other end of the second rotating shaft 37 extends to the outside of the filter tank 17, a sealing inclined plate is rotatably arranged on the transmission shaft 36, the sealing inclined plate is fixed inside the sliding pipe 29, the fixed box is fixed at the bottom end inside the connecting cover 28, a sliding push rod 40 is rotatably arranged outside the second rotating shaft 37, one end of the sliding push rod 40 is rotatably arranged at the upper end of the sliding pipe 29, one end of the sliding push rod 40 extends to the outside of the filter tank 17, an external spline shaft is fixed at the other end of the second rotating shaft 37, an internal spline shaft 38 is arranged in fit with the external spline shaft, the internal spline shaft 38 is fixed at the output end of a second motor 39, the second motor 39 is fixed at the upper end inside a fixed frame, the fixed frame is fixed at the upper end of the filter tank 17, a connecting plate is fixed at the other end of the sliding push rod 40, the connecting plate is fixedly connected with the output ends of two electric cylinders 41 at both ends, the electric cylinders 41 are fixed at the upper end inside the fixed frame, in use, raw water enters the water inlet cavity inside through the water inlet pipe 20, then the raw water enters the filter screen cylinder 23 inside through the communication pipe, the raw water is filtered through the filter screen cylinder 23 and is discharged into the filter cavity through the water outlet of the fixed pipe 24, then it is discharged through the water outlet pipe 21, when the external detection component detects that the pressure at the end of the water outlet pipe 21 decreases, the external control component starts the electric cylinder 41, the output end of the electric cylinder 41 drives the sliding push rod 40 to slide, the sliding push rod 40 drives the sliding pipe 29 and the connecting cover 28 to slide, so that the connecting cover 28 is separated from one end of the communication pipe, at this time, the filter screen cylinder 23 coaxial with the connecting cover 28 is in a state of being cleaned and not being used, then the external control component controls the first motor 33 to start, the first motor 33 drives the rotating pipe 30 to rotate, the rotating pipe 30 drives the connecting cover 28 to rotate by 90 degrees through the sliding pipe 29, so that the connecting cover 28 is located below the other communication pipe and is coaxial with the communication pipe, then the output end of the electric cylinder 41 is retracted, the sliding push rod 40 drives the sliding pipe 29 and the connecting cover 28 to rise, so that the connecting cover 28 is sleeved with the communication pipe, at the same time, the friction recess wheel 35 is tightly matched with the friction convex wheel 34, then the second motor 39 is started, the second motor 39 drives the transmission shaft 36 to rotate through the second rotating shaft 37, the transmission shaft 36 drives the friction recess wheel 35 to rotate, the friction recess wheel 35 is frictionally driven by the friction convex wheel 34, thereby driving the first rotating shaft 27 to rotate,The first rotating shaft 27 drives the scraping rod 26 to rotate. Since the scraping rod 26 is in close contact with the inner wall of the filter screen cylinder 23, the scraping rod 26 scrapes off the impurities attached to the inner wall of the filter screen cylinder 23, thereby cleaning the inner wall of the filter screen cylinder 23.

[0033] The second drain pipe 31 is provided with a second valve 16 at one end, the filter tank 17 is provided with a first drain pipe 22 at one end, the first drain pipe 22 is provided with a second connecting pipe 14 at one end, the second connecting pipe 14 is provided with a first valve 15 at one end, the second connecting pipe 14 and the second drain pipe 31 are both in communication with the input end of the external liquid pumping component. When the impurities in the water inlet cavity need to be discharged, the first valve 15 is opened, and the external liquid pumping component works to pump out the raw water in the water inlet cavity. Since the second partition plate 19 is inclined, it is convenient to discharge the impurities. When the impurities in the filter screen cylinder 23 need to be discharged, the second valve 16 is opened, and the external liquid pumping component works to make the raw water in the fixed pipe 24 pass through the connecting cover 28, the sliding pipe 29, the rotating pipe 30 and the second drain pipe 31 to be discharged, and the impurities are discharged together with the raw water.

[0034] The closing mechanism comprises rotating baffles 25, which are symmetrically arranged inside the drain outlets, and rotating shafts at both ends of the rotating baffles 25 are rotatably arranged in the mounting holes inside the drain outlets, one end of the rotating shaft of each rotating baffle 25 extends into the water inlet cavity, and a fixed column 42 is arranged at one end of the rotating shaft of each rotating baffle 25, a spiral groove 43 is arranged on the fixed column 42, a guide column 44 is slidably arranged in the spiral groove 43, the guide column 44 is fixedly arranged in a sleeve pipe 45, the sleeve pipe 45 is sleeved on one end of the fixed column 42, an extension plate is fixedly arranged at one end of the sleeve pipe 45, a guide sliding rod is slidably arranged on the extension plate, and the guide sliding rod is fixedly arranged at the bottom end of the first partition plate 18; a connecting plate is fixedly arranged between the sleeve pipes 45 on the same side, a top rod 46 is fixedly arranged on the connecting plate at a position corresponding to the outer side of the connecting cover 28, a backflushing disc 47 is fixedly arranged at the upper end inside the filter screen cylinder 23, a filter screen is arranged at the bottom end of the backflushing disc 47, a reflux pipe 48 is communicatively arranged inside the backflushing disc 47, and one end of the reflux pipe 48 extends to the outside of the fixed pipe 24.

[0035] The filter screen is tightly arranged at the bottom end of the cleaning rod, and the cleaning rod is fixedly arranged at one end of the scraping rod 26. In use, the impurities attached to the bottom end of the backflushing disc 47 can be easily cleaned, thereby preventing the filter screen at the bottom end of the backflushing disc 47 from being blocked.

[0036] The above embodiment discloses a multi-stage filtering device for pure water treatment. When filtering pure water, the water inlet pipe 20 on the outermost filtering component 11 is connected to the output end of the external liquid supply component, and then the raw water enters the water inlet cavity. Then the raw water enters the filtering cavity through the filter screen cylinder 23, and the filtered raw water is discharged through the water outlet pipe 21 and enters the next filtering component 11 through the first connecting pipe 13 for multi-stage filtering. After the raw water is filtered by the last filtering component 11, it enters the reverse osmosis purification component 12 for reverse osmosis purification.

[0037] When the external detection component detects a decrease in pressure at the end of the water outlet pipe 21, the external control component activates the electric cylinder 41. The output end of the electric cylinder 41 drives the sliding push rod 40 to slide, which in turn drives the sliding tube 29 and the connecting cover 28 to slide, causing the connecting cover 28 to detach from the end of one connecting pipe. At this time, the filter screen cylinder 23, coaxial with the connecting cover 28, is in a cleaned and unused state. Subsequently, the external control component activates the first motor 33, which drives the rotating tube 30 to rotate. The rotating tube 30, through the sliding tube 29, drives the connecting cover 28 to rotate 90 degrees, placing the connecting cover 28 below another connecting pipe and coaxial with it. Then, the output end of the electric cylinder 41 retracts, and the sliding push rod 40 drives the sliding tube 29 and the connecting cover 28 to rise, thereby causing the connecting cover 28 to engage with the connecting pipe. Simultaneously, the connecting cover 28 drives the push rod 46 to move. When one end of the push rod 46 is in close contact with the bottom end of the connecting plate, the push rod... 46 pushes the two sleeves 45 to slide through the connecting plate. The sleeves 45 drive the guide post 44 to move. The guide post 44 slides in the spiral groove 43, which in turn causes the fixed post 42 to drive the rotating baffle 25 to rotate. When the connecting cover 28 stops moving, the two rotating baffles 25 close the drain port. The friction concave wheel 35 and the friction cam 34 are tightly engaged. Then the second motor 39 is started. The second motor 39 drives the transmission shaft 36 to rotate through the second rotating shaft 37. The transmission shaft 36 drives the friction concave wheel 35 to rotate. The friction concave wheel 35 and the friction cam 34 engage to drive the first rotating shaft 27 to rotate. The first rotating shaft 27 drives the scraper 26 to rotate. Since the scraper 26 is in close contact with the inner wall of the filter screen cylinder 23, the scraper 26 scrapes off the impurities attached to the inner wall of the filter screen cylinder 23, thereby cleaning the inner wall of the filter screen cylinder 23. The scraper 26 cleans the filter screen at the bottom of the backwash plate 47 through the cleaning rod.

[0038] Then, the second valve 16 is opened, and the external liquid extraction component works, causing the raw water inside the fixed pipe 24 to be discharged through the connecting cover 28, sliding pipe 29, rotating pipe 30 and second drain pipe 31. When the raw water is discharged, it also carries away impurities. At the same time, the raw water inside the filter chamber enters the backwash plate 47 through the return pipe 48. The backwash plate 47 discharges the raw water, thus replacing the raw water inside the fixed pipe 24. Meanwhile, since the raw water inside the filter chamber is replaced from the end of the filter screen cylinder 23, the impurities inside the filter screen cylinder 23 are discharged.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multi-stage filtering device for pure water treatment, comprising a filtering component and a reverse osmosis purifying component, the filtering component comprising a filtering tank, a first partition and a second partition being fixedly arranged inside the filtering tank, a filtering cavity being combined between the upper end of the first partition and the upper end of the filtering tank, a water inlet cavity being combined between the bottom end of the first partition and the upper end of the second partition, a plurality of filtering screen barrels being arranged in an array on the inner circumference of the filtering cavity, a communication pipe being communicated with one end of each of the filtering screen barrels, the communication pipe being fixedly arranged in a mounting hole on the upper end of the first partition, characterized in that, The filter chamber is fixed with a fixed pipe at the coaxial position with the filter screen cylinder. Each fixed pipe is provided with a drain port. The water inlet chamber is provided with a cleaning mechanism for cleaning impurities inside several filter screen cylinders. The drain port on one side of the fixed pipe is provided with a sealing mechanism for sealing the inside of the fixed pipe. The filter tank is provided with an outlet pipe and an inlet pipe respectively at the positions corresponding to the filter chamber and the inlet chamber. Several filter components are fixedly installed on the upper part of the mounting platform. Several filter components are connected to each other through a first connecting pipe. A third connecting pipe is provided at the end of the outlet pipe of one filter component. The other end of the third connecting pipe is connected to the input end of the reverse osmosis purification component. The cleaning mechanism includes a scraper and a connecting cover. The inner wall of the filter cylinder is fitted with a scraper. Several connecting rods are fixed on one side of each scraper. The other end of each connecting rod is fixed on a first rotating shaft. One end of the first rotating shaft is rotatably mounted inside the upper part of the filter cylinder. The other end of the first rotating shaft is rotatably mounted with a support frame. The support frame is fixed inside a connecting pipe. A transmission pipe is connected to the connecting cover. The other end of the transmission pipe is connected to a sliding pipe. A rotating tube is slidably sleeved at one end of the sliding tube. One end of the rotating tube extends to the outside of the filter tank. A second drain pipe is rotatably connected to one end of the rotating tube. A driven gear is fixedly mounted at one end of the rotating tube. A driving gear meshes with the driven gear. The driving gear is fixedly mounted on the output end of the first motor. The first motor is fixedly mounted at the bottom end of the filter tank. The connecting cover is slidably sleeved with one end of the connecting tube. A drive assembly for driving the first rotating shaft to rotate is provided inside the connecting cover and the sliding tube. The drive assembly includes a friction concave wheel, and a friction cam is provided inside the friction concave wheel for frictional engagement. A friction cam is fixedly provided at one end of the first rotating shaft. The friction concave wheel is fixedly provided at one end of a fixed shaft. The fixed shaft is rotatably provided in the mounting hole at the upper end of the fixed box. A first bevel gear is fixedly provided at the other end of the fixed shaft. A second bevel gear is meshed on the first bevel gear. The second bevel gear is fixedly provided at one end of the transmission shaft. The drive shaft is rotatably mounted in a mounting hole on one side of the fixed box. A third bevel gear is fixedly mounted on the other end of the drive shaft. A fourth bevel gear meshes with the third bevel gear. The fourth bevel gear is fixedly mounted on one end of a second rotating shaft. The other end of the second rotating shaft extends to the outside of the filter tank. A sealing inclined plate is rotatably mounted on the drive shaft. The sealing inclined plate is fixedly mounted inside the sliding tube. The fixed box is fixedly mounted at the bottom of the connecting cover. A sliding push rod is rotatably mounted on the outside of the second rotating shaft. One end of the sliding push rod is rotatably mounted on the upper end of the sliding tube. The other end of the sliding push rod extends to the outside of the filter tank. The other end of the second rotation axis is fixedly provided with an external spline shaft, an internal spline shaft is matched and arranged on the external spline shaft, the internal spline shaft is fixedly arranged at the output end of the second motor, the second motor is fixedly arranged at the upper end of the inner side of the fixed frame, the fixed frame is fixedly arranged at the upper end of the filter tank, the other end of the sliding push rod is fixedly provided with a connecting plate, the connecting plate is fixedly connected with the output ends of the two electric cylinders respectively, and the electric cylinders are fixedly arranged at the upper end of the inner side of the fixed frame. The closing mechanism comprises rotating baffles, rotating baffles are symmetrically arranged inside the drain outlets, rotating shafts at two ends of the rotating baffles are rotatably arranged in mounting holes inside the drain outlets, the rotating shafts at one end of the rotating baffles extend into the water inlet cavities, the rotating shafts at one end of the rotating baffles are provided with fixed columns, the fixed columns are provided with spiral grooves, guide columns are slidably arranged in the spiral grooves, the guide columns are fixedly arranged inside the sleeve pipes, the sleeve pipes are sleeved with the fixed columns, one end of the sleeve pipes is fixedly provided with an extension plate, guide sliding rods are slidably arranged on the extension plate, the guide sliding rods are fixedly arranged at the bottom end of the first partition plate, connecting plates are fixedly arranged between the sleeve pipes on the same side, jacks are fixedly arranged on the connecting plates at positions corresponding to the connecting plates, backflush discs are fixedly arranged at upper ends inside the filter screen cylinders, the backflush discs are provided with filter screens at bottom ends, the backflush discs are communicated with reflux pipes, and the reflux pipes extend to the outside of the fixed pipes at one end.

2. The multi-stage filtration apparatus for pure water treatment according to claim 1, wherein One end of the second blow-off pipe is communicated with a second valve, a first blow-off pipe is communicated with the water inlet cavity on the filter tank, the first blow-off pipe is communicated with a second connecting pipe at one end, the second connecting pipe is communicated with a first valve at one end, and one end of the second connecting pipe and the second blow-off pipe is communicated with an input end of an external liquid pumping component.

3. The multi-stage filtration apparatus for pure water treatment according to claim 2, wherein The filter screen is tightly arranged with a cleaning rod at the bottom end, and the cleaning rod is fixedly arranged at one end of the scraping rod. The filter screen is tightly arranged with a cleaning rod at the bottom end, and the cleaning rod is fixedly arranged at one end of the scraping rod.

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