A gravity ultrafiltration membrane multi-stage water purification device

Abstract

The present invention discloses a gravity ultrafiltration membrane multi-stage water purification device, which relates to the technical field of water purification devices. It includes a raw water tank, a mixing tank, a filtration tank and a purified water tank. The water outlet end of the raw water tank is connected to the mixing tank, the filtration tank and the purified water tank in sequence through pipelines. One end of the mixing tank is provided with a feeding tank, and a flocculant is placed inside the feeding tank. The discharging end of the feeding tank is provided with a quantitative feeding mechanism. A stirring shaft is rotatably arranged inside the mixing tank. An inner cylinder is arranged below the interior of the filtration tank. A coarse filtration layer is arranged between the inner wall of the filtration tank and the outer wall of the inner cylinder. A partition plate is arranged between the filtration tank above the coarse filtration layer and the inner cylinder. A plurality of one-way valves are arranged on the partition plate. An ultrafiltration cylinder is arranged below the interior of the inner cylinder. An upper cover and a lower cover are respectively arranged at the upper and lower ends of the ultrafiltration cylinder. A drain pipe communicated with the purified water tank is arranged at the central position of the lower cover. An inner sewage discharge port communicated with the outside is arranged at the lower end of the inner cylinder. The present invention blows air into the ultrafiltration cylinder and the coarse filtration layer through an air pump, and uses gas backwashing to achieve the effect of cleaning the filtration structure.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification equipment, and particularly to a gravity ultrafiltration membrane multi-stage water purification equipment. Background Art

[0002] Algae are a common type of organic pollutant in water bodies. Their growth and reproduction can cause deterioration of water quality indicators such as chromaticity, turbidity, and odor, affecting the safety and aesthetics of water quality. At the same time, it also increases the difficulty and cost of water treatment. Currently, the common methods for removing algae in water mainly include physical methods, chemical methods, and biological methods, etc.;

[0003] The physical method uses filtration, sedimentation, flotation, etc. to separate algae from the water body. However, this method cannot completely remove algae and will produce a large amount of sludge that needs further treatment; The chemical method uses chemical agents such as oxidants, flocculants, and algaecides to kill or agglomerate algae, and then removes them through filtration or sedimentation, etc. However, this method consumes a large amount of chemical agents and will cause secondary pollution to the water body, affecting the safety and stability of water quality; The biological method uses organisms such as microorganisms, aquatic plants, and fish to biodegrade or prey on algae. However, this method requires a long time and is greatly affected by environmental factors and is difficult to control;

[0004] Ultrafiltration membrane is a water treatment technology that uses the separation principle of a semi-permeable membrane to intercept suspended solids, colloids, microorganisms, etc. in the water body. It has the advantages of simple operation, high efficiency, small floor area, low energy consumption, etc. However, when the ultrafiltration membrane is used to treat water containing algae, it will face the problem of membrane fouling, that is, algae and their metabolites will form a fouling layer on the membrane surface or in the membrane pores, resulting in a decrease in membrane flux, an increase in membrane resistance, and a shortening of membrane life;

[0005] To solve the problem of membrane fouling, it is usually necessary to clean the ultrafiltration membrane. Among them, chemical cleaning is the most commonly used method, that is, using chemical agents such as acids, alkalis, and oxidants to dissolve or oxidize the pollutants on the membrane surface or in the membrane pores, thereby restoring the performance of the membrane;

[0006] A gravity ultrafiltration membrane short - process water purification device such as "CN118343869A" includes: a water purification device housing. A filter screen is fixedly installed on the inner wall of the water purification device housing near the bottom, and a filter cotton board is fixedly installed on the inner wall of the water purification device housing above the filter screen. In the present invention, by controlling the air pump to start through the controller, gas can be sequentially transported through the air inlet pipe and the connecting pipe to the compression cavity inside the pneumatic telescopic rod, so that the air outlet pipe can be extended, pushing the movable strip to move to one side along the outer surface of the guide member, synchronously driving the brush plate to move to one side to clean larger impurities at the bottom of the filter screen. At the same time, under the restoring force of the compression spring, the movable strip moves back along the outer surface of the guide member, so that larger impurities at the bottom of the filter screen can be cleaned, thereby increasing the speed of water passing through the ultrafiltration membrane filaments, and further improving the filtration effect of this device.

[0007] However, traditional ultrafiltration membrane devices have the following problems: They need to be chemically cleaned regularly, resulting in high consumption and treatment costs of chemical agents. Chemical agents may damage the membrane material, increasing the complexity and cost of equipment operation and maintenance, and causing secondary pollution to the environment at the same time. They require a long water treatment process, occupying a large amount of land space, which is not conducive to the transformation of old water plants and application scenarios with limited land. Summary of the Invention

[0008] In view of the above existing problems, the present invention is proposed.

[0009] The purpose of the present invention is to solve the problem in the prior art that chemical cleaning is commonly used for ultrafiltration membranes, and the cost is high during chemical cleaning and chemical agents may damage the membrane material.

[0010] To solve the above - mentioned technical problems, the present invention provides the following technical solutions:

[0011] On the one hand, the present invention provides a gravity ultrafiltration membrane multi-stage water purification device, which includes a raw water tank, a mixing tank, a filtration tank and a purified water tank. The water outlet end of the raw water tank is sequentially connected to the mixing tank, the filtration tank and the purified water tank through pipelines. One end of the mixing tank is provided with a feeding tank, which contains a flocculant. The discharging end of the feeding tank is provided with a quantitative discharging mechanism. A stirring shaft is rotatably arranged in the mixing tank. An inner cylinder is arranged below the interior of the filtration tank. A coarse filtration layer is arranged between the inner wall of the filtration tank and the outer wall of the inner cylinder. A partition is arranged between the filtration tank and the inner cylinder above the coarse filtration layer. A plurality of one-way valves are arranged on the partition. An ultrafiltration cylinder is arranged below the interior of the inner cylinder. The upper and lower ends of the ultrafiltration cylinder are respectively provided with an upper cover and a lower cover. A drain pipe communicating with the purified water tank is arranged at the central position of the lower cover. The lower end of the inner cylinder is provided with an inner sewage discharge port communicating with the outside. An outer sewage discharge port is arranged below the filtration tank. A first spray pipe is arranged at the central position inside the ultrafiltration cylinder. The first spray pipe is assembled and connected to the upper cover. A second spray pipe is arranged above the coarse filtration layer. An air pump is arranged outside the filtration tank. The air pump is respectively communicated with the first spray pipe and the second spray pipe through air pipes. An ultraviolet lamp is arranged inside the inner cylinder.

[0012] Further, a water rack is arranged above the mixing tank through a fixing frame. The water rack is arranged in a U-shaped structure. The two ends of the water rack are respectively communicated with the inside of the raw water tank and one end of the mixing tank. A fan blade is rotatably arranged inside the water rack. The upper end of the stirring shaft penetrates through the fixing frame and the bottom of the water rack and is linked with the fan blade. When the water in the raw water tank passes through the inside of the water rack, the water flow drives the fan blade to rotate, and then drives the stirring shaft to rotate, so as to realize the full mixing of the flocculant added in the water and the water flow. The water discharged from the water rack directly flows into the inside of the mixing tank.

[0013] Further, a plurality of baffles are arranged at intervals inside the mixing tank. A plurality of stirring shafts are arranged and distributed at both ends and the central position of the mixing tank. By arranging the baffles, the effect of the mixed liquid flowing up and down in the mixing tank is increased. Cooperating with a plurality of rotatably arranged stirring shafts, the mixing efficiency and mixing quality can be improved.

[0014] Further, the quantitative discharging mechanism includes a sleeve, a roller and a first motor. The sleeve is arranged below the feeding tank and communicated with the discharging end of the feeding tank. An outlet is arranged below the sleeve and is located directly above one end of the mixing tank. The roller is rotatably arranged inside the sleeve, and the outer wall of the roller is slidably arranged with the inner wall of the sleeve. The roller is driven to rotate by the first motor. A plurality of quantitative grooves are arranged at intervals on the side wall of the roller. When the first motor drives the roller to rotate, the upper quantitative groove is filled with the flocculant falling from the feeding tank. As the roller rotates, this quantitative groove rotates to the lower part, and the flocculant in the quantitative groove falls into the mixing tank.

[0015] Furthermore, the coarse filtration layer sequentially includes an anthracite filtration layer, a quartz sand filtration layer, and an activated carbon filtration layer from bottom to top. The second nozzle is provided with a plurality of nozzles respectively located between the anthracite filtration layer, the quartz sand filtration layer, and the activated carbon filtration layer. The anthracite filtration layer is used to intercept larger particles and algae. The quartz sand filtration layer is used to remove medium-sized particulate matter and suspended algae. The activated carbon filtration layer is used for deep filtration, adsorbing organic substances and odors. The second nozzle is provided with a plurality of nozzles to flush each filtration layer, resulting in a better cleaning effect.

[0016] Furthermore, a central pipe communicated with the air pipe is provided at the central position of the upper cover. The lower end of the central pipe is hermetically and rotatably connected to the upper end of the first nozzle. A plurality of air holes are evenly provided on the first nozzle. The air holes are inclined with respect to the side wall of the first nozzle. The central pipe is a sealed rotating head. When gas is introduced into the first nozzle and the gas is ejected obliquely from the air holes, the overall rotation of the first nozzle is promoted by the reaction force of the jet, achieving a uniform gas backwashing operation for all corners of the ultrafiltration cartridge.

[0017] Furthermore, a placement groove is provided on the inner wall of the filtration box. An annular frame is hermetically and rotatably provided inside the placement groove. A plurality of fixing rings are provided up and down inside the inner ring of the annular frame. The fixing rings are assembled and connected to the second nozzle. A second motor is provided outside the filtration box. The output end of the second motor is linked with an external gear. A toothed ring is provided on the outer wall of the annular frame. An internal gear meshing with the toothed ring is rotatably provided on the side wall of the filtration box. The external gear meshes with the internal gear on one side. By driving the second motor to drive the external gear to rotate, driving the internal gear and the toothed ring to rotate, the rotation of the annular frame is realized, driving the second nozzle arranged on the fixing ring to rotate, and realizing the rotational flushing during the backwashing process of the second nozzle, ensuring a full-round flushing of the coarse filtration layer.

[0018] Furthermore, a rotating ring is rotatably provided on the inner wall of the filtration box. The inner side of the rotating ring is clamped and rotatably provided with the outer wall of the partition plate. The output end of the air pipe is located at the central position above the interior of the filtration box. The output end of the air pipe is provided with a first connecting pipe and a second connecting pipe through a rotary joint. The first connecting pipe and the second connecting pipe are respectively communicated with the first nozzle and the second nozzle. An annular track is provided on the inner wall of the filtration box at the upper end of the inner cylinder. The second connecting pipe is slidably connected with the annular track through a slider below. Through the provided rotary joint, when the annular frame rotates, it drives the second nozzle, the second connecting pipe, and the rotating ring to rotate, preventing the situation of pipeline entanglement. The high-pressure gas output by the air pump enters the first nozzle and the second nozzle through the first connecting pipe and the second connecting pipe respectively, and is finally ejected at high pressure to achieve the backwashing effect.

[0019] Furthermore, a drainage port is provided at the upper end of the inner tube, and a plurality of drainage ports are provided. A drainage plate is provided on the inner wall of the inner tube at the drainage port, and water flows from the drainage port into the inner tube through the provided drainage port.

[0020] Furthermore, a waterproof cover is provided outside the ultraviolet lamp. There are multiple waterproof covers and they are arranged on the inner wall and the top of the filter box. The waterproof cover is used to waterproof the ultraviolet lamp to prevent water from entering the interior.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention starts the air pump to drive the high-pressure gas to enter the first nozzle and the second nozzle through the air pipe respectively. The ultrafiltration cartridge can be blown from the inside to the outside through the first nozzle, and the impurities attached to the ultrafiltration cartridge are flushed out to between the ultrafiltration cartridge and the inner cylinder, and mixed with the water in the inner cylinder so that the impurities on the ultrafiltration cartridge are easier to separate. The buffering of the water flow can reduce the damage of the airflow to the ultrafiltration cartridge, and the sewage is discharged through the inner sewage outlet. The second nozzle impacts the upper part of the coarse filter layer downward by rotating. Similarly, the coarse filter layer is in the water, and the impurities after backwashing can be mixed in the water and finally discharged from the external sewage outlet to ensure the backwashing effect.

[0023] 2. The present invention achieves the effect of coarse filtration and fine filtration of water flow through the cooperation of the coarse filtration layer and the ultrafiltration cartridge built into the inner cylinder. The water flows into the filter box from below, and flows down from the upper end of the inner cylinder to form a half-meter water head, which can achieve the effect of filtering the water flow through the ultrafiltration cartridge without pumping.

[0024] 3. In the process of water flow in the water rack of the present invention, the fan blades are driven to rotate, and then the stirring shaft is driven to rotate. The water flow is finally discharged from the other end of the water rack into the mixing pool. When the water flow enters the mixing pool, the flocculant in the feeding box is discharged into the mixing pool through the quantitative feeding mechanism. The impact of the water flow and the stirring of the partition and the stirring shaft ensure the uniformity of the mixing of water and flocculant.

[0025] 4. The ultraviolet lamp provided in the present invention can sterilize and disinfect the water flow during the water filtration process to ensure the water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 A three-dimensional diagram of a gravity-type ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0028] Figure 2 Schematic diagram of the internal structure of the mixing tank of a gravity ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0029] Figure 3 Schematic diagram of the internal structure of the water rack of a gravity ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0030] Figure 4 Schematic diagram of the assembly structure of the feeding box and the quantitative feeding mechanism of a gravity ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0031] Figure 5 Schematic diagram of the internal structure of the filtration tank of a gravity ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0032] Figure 6 Schematic diagram of the assembly of the filtration tank and the inner cylinder of a gravity ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0033] Figure 7 Schematic diagram of the assembly structure of the ring rack and the coarse filtration layer of a gravity ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0034] Figure 8 Schematic diagram of the position of the filtration tank and the placement groove of a gravity ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0035] Figure 9 Schematic diagram of the internal structure of the inner cylinder of a gravity ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0036] Figure 10 Schematic diagram of the internal structure of the ultrafiltration cylinder of a gravity ultrafiltration membrane multi-stage water purification device provided by the present invention.

[0037] Legend:

[0038] 1. Original water tank; 2. Mixing tank; 3. Filter tank; 4. Clean water tank; 5. Feeding tank; 6. Stirring shaft; 711. Inner cylinder; 712. Coarse filtration layer; 713. Partition board; 714. Check valve; 811. Ultrafiltration cartridge; 812. Upper cover; 813. Lower cover; 814. Drain pipe; 815. Inner sewage outlet; 816. Outer sewage outlet; 911. First spray pipe; 912. Second spray pipe; 913. Air pump; 914. Air pipe; 10. Ultraviolet lamp; 111. Fixed rack; 112. Water rack; 113. Fan blade; 121. Sleeve; 122. Roller; 123. First motor; 124. Measuring tank; 131. Anthracite filtration layer; 132. Quartz sand filtration layer; 133. Activated carbon filtration layer; 141. Central pipe; 142. Air hole; 151. Placing groove; 152. Ring rack; 153. Fixed ring; 154. Second motor; 155. Outer gear; 156. Tooth ring; 157. Inner gear; 161. Rotating ring; 162. Rotary joint; 163. First connecting pipe; 164. Second connecting pipe; 165. Ring track; 166. Slide block; 171. Drainage port; 172. Drainage plate; 18. Waterproof cover; 211. Baffle plate. Detailed implementation manners

[0039] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will give a detailed description of the specific implementation manners of the present invention with reference to the accompanying drawings of the specification.

[0040] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar promotions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0041] Secondly, as referred to herein, "an embodiment" or "embodiment" means a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The phrase "in an embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it an individual or alternative embodiment that is mutually exclusive with other embodiments.

[0042] Please refer to Figures 1 - 10, the present invention provides a technical solution: a gravity ultrafiltration membrane multi-stage water purification device, including a raw water tank 1, a mixing tank 2, a filtration tank 3 and a purified water tank 4. The water outlet end of the raw water tank 1 is connected in sequence with the mixing tank 2, the filtration tank 3 and the purified water tank 4 through pipelines. One end of the mixing tank 2 is provided with a feeding tank 5, the feeding tank 5 is internally provided with a flocculant, the discharging end of the feeding tank 5 is provided with a quantitative feeding mechanism, a stirring shaft 6 is rotatably arranged in the mixing tank 2, an inner cylinder 711 is arranged below the interior of the filtration tank 3, a coarse filtration layer 712 is arranged between the inner wall of the filtration tank 3 and the outer wall of the inner cylinder 711, a partition plate 713 is arranged between the filtration tank 3 above the coarse filtration layer 712 and the inner cylinder 711, a plurality of one-way valves 714 are arranged on the partition plate 713, an ultrafiltration cylinder 811 is arranged below the interior of the inner cylinder 711, upper and lower covers 812 and 813 are respectively arranged at the upper and lower ends of the ultrafiltration cylinder 811, a drain pipe 814 communicated with the purified water tank 4 is arranged at the central position of the lower cover 813, an inner sewage discharge port 815 communicated with the outside is arranged at the lower end of the inner cylinder 711, an outer sewage discharge port 816 is arranged below the filtration tank 3, a first spray pipe 911 is arranged at the central position inside the ultrafiltration cylinder 811, the first spray pipe 911 is assembled and connected with the upper cover 812, a second spray pipe 912 is arranged above the coarse filtration layer 712, an air pump 913 is arranged outside the filtration tank 3, and the air pump 913 is communicated with the first spray pipe 911 and the second spray pipe 912 respectively through an air pipe 914. A ultraviolet lamp 10 is arranged inside the inner cylinder 711.

[0043] As Figures 1 - 10 shown, a water rack 112 is arranged above the mixing tank 2 through a fixing frame 111. The water rack 112 is arranged in a U-shaped structure. Both ends of the water rack 112 are respectively communicated with the inside of one end of the raw water tank 1 and the mixing tank 2. A fan blade 113 is rotatably arranged inside the water rack 112. The upper end of the stirring shaft 6 penetrates through the fixing frame 111 and the bottom of the water rack 112 and is linked with the fan blade 113. When the water in the raw water tank 1 passes through the inside of the water rack 112, the water flow pushes the fan blade 113 to rotate, and then drives the stirring shaft 6 to rotate, so as to realize the full mixing of the flocculant added in the water and the water flow. The water discharged from the water rack 112 directly flows into the inside of the mixing tank 2.

[0044] As Figures 1 - 10 shown, a plurality of baffles 211 are arranged at intervals inside the mixing tank 2. A plurality of stirring shafts 6 are arranged and distributed at both ends and the central position of the mixing tank 2. By arranging the baffles 211, the effect of the mixed liquid flowing up and down in the mixing tank 2 is increased. Cooperating with a plurality of rotatably arranged stirring shafts 6, the mixing efficiency and mixing quality can be improved.

[0045] As Figures 1 - 10As shown, the quantitative feeding mechanism includes a sleeve 121, a rotating roller 122, and a first motor 123. The sleeve 121 is arranged below the feeding box 5 and is communicated with the discharging end of the feeding box 5. There is a discharging port below the sleeve 121 and it is directly above one end of the mixing tank 2. The rotating roller 122 is rotatably arranged inside the sleeve 121 and its outer wall is slidably arranged with the inner wall of the sleeve 121. The rotating roller 122 is driven to rotate by the first motor 123. A plurality of quantitative grooves 124 are spaced apart on the side wall of the rotating roller 122. When the first motor 123 drives the rotating roller 122 to rotate, the quantitative groove 124 located above is filled with the flocculant falling from the feeding box 5. As the rotating roller 122 rotates, this quantitative groove 124 rotates to the lower part, and the flocculant in the quantitative groove 124 falls into the mixing tank 2.

[0046] As Figures 1 - 10 shown, the coarse filtration layer 712 successively includes an anthracite filtration layer 131, a quartz sand filtration layer 132, and an activated carbon filtration layer 133 from bottom to top. A plurality of second spray pipes 912 are provided between the anthracite filtration layer 131, the quartz sand filtration layer 132, and the activated carbon filtration layer 133 respectively. The anthracite filtration layer 131 is used to intercept larger particles and algae. The quartz sand filtration layer 132 is used to remove medium-sized particulate matters and suspended algae. The activated carbon filtration layer 133 is used for deep filtration, adsorbing organic matters and odors. The plurality of second spray pipes 912 can wash each filtration layer, making the cleaning effect better.

[0047] As Figures 1 - 10 shown, a central pipe 141 communicated with the air pipe 914 is provided at the central position of the upper cover 812. The lower end of the central pipe 141 is hermetically and rotatably connected to the upper end of the first spray pipe 911. A plurality of air holes 142 are evenly provided on the first spray pipe 911. The air holes 142 are inclined with respect to the side wall of the first spray pipe 911. The central pipe 141 is a sealed rotating head. When gas is introduced into the first spray pipe 911 and the gas is sprayed obliquely from the air holes 142, the first spray pipe 911 as a whole is pushed to rotate by the reaction force of the jet, and uniform gas backwashing operation of each corner of the ultrafiltration cylinder 811 can be achieved.

[0048] As Figures 1 - 10As shown in the figure, a placement groove 151 is provided on the inner wall of the filtration box 3. Inside the placement groove 151, a ring frame 152 is rotatably sealed. A plurality of fixed rings 153 are provided up and down inside the inner ring of the ring frame 152. The fixed rings 153 are assembled and connected to the second spray pipe 912. A second motor 154 is provided outside the filtration box 3. The output end of the second motor 154 is linked with an external gear 155. A toothed ring 156 is provided on the outer wall of the ring frame 152. An internal gear 157 that meshes with the toothed ring 156 is rotatably provided on the side wall of the filtration box 3. The external gear 155 meshes with the internal gear 157 on one side. By driving the second motor 154 to drive the external gear 155 to rotate, the internal gear 157 and the toothed ring 156 are driven to rotate, realizing the rotation of the ring frame 152, driving the second spray pipe 912 provided on the fixed ring 153 to rotate, and realizing the rotational flushing during the backwashing process of the second spray pipe 912, ensuring all-round flushing of the coarse filtration layer 712.

[0049] As Figures 1 - 10 As shown in the figure, a rotating ring 161 is rotatably provided on the inner wall of the filtration box 3. The inner side of the rotating ring 161 is clamped and rotatably provided with the outer wall of the partition plate 713. The output end of the air pipe 914 is located at the center position above the interior of the filtration box 3. The output end of the air pipe 914 is provided with a first connecting pipe 163 and a second connecting pipe 164 through a rotary joint 162. The first connecting pipe 163 and the second connecting pipe 164 are respectively communicated with the first spray pipe 911 and the second spray pipe 912. On the inner wall of the filtration box 3 at the upper end of the inner cylinder 711, a ring track 165 is provided. The second connecting pipe 164 is slidably connected with the ring track 165 through a slider 166 below. Through the provided rotary joint 162, when the ring frame 152 rotates, it drives the second spray pipe 912, the second connecting pipe 164 and the rotating ring 161 to rotate, preventing the situation of pipeline entanglement. The high-pressure gas output by the air pump 913 enters the first spray pipe 911 and the second spray pipe 912 through the first connecting pipe 163 and the second connecting pipe 164 respectively, and finally sprays out at high pressure to achieve the backwashing effect.

[0050] As Figures 1 - 10 As shown in the figure, a plurality of drainage ports 171 are provided at the upper end of the inner cylinder 711. Drainage plates 172 are provided on the inner wall of the inner cylinder 711 at the drainage ports 171. Through the provided drainage ports 171, water flows into the inner cylinder 711 from the drainage ports 171.

[0051] As Figures 1 - 10 As shown in the figure, a waterproof cover 18 is provided outside the ultraviolet lamp 10. A plurality of waterproof covers 18 are provided and are arranged on the inner wall and above of the filtration box 3. Through the provided waterproof cover 18, it is used to waterproof the ultraviolet lamp 10 and prevent internal water ingress.

[0052] Working principle: When performing the water inlet operation, the water in the original water tank 1 is pumped into the water rack 112. During the flow of water in the water rack 112, the fan blades 113 are driven to rotate, and then the stirring shaft 6 is driven to rotate. Finally, the water flows out from the other end of the water rack 112 into the mixing tank 2. At the same time when the water enters the mixing tank 2, the flocculant in the feeding box 5 is fed into the mixing tank 2 through the quantitative feeding mechanism. Through the impact of the water flow, the cooperation of the baffle 713 and the stirring shaft 6, the flocculant is evenly mixed in the water, so that the impurities in the water are gradually formed into flocs, which is convenient for filtration. The liquid in the mixing tank 2 is pumped to the lower part inside the filter tank 3, and the water flow enters the space between the filter tank 3 and the inner cylinder 711 from bottom to top, and sequentially passes through the coarse filtration layer 712 for filtration. This process can filter out the particulate matter and obvious water algae in the water, adsorb organic matter. The water passing through the coarse filtration layer 712 flows upward and passes through the one-way valve 714 to enter the inside of the inner cylinder 711 from the upper end of the inner cylinder 711. The ultrafiltration cylinder 811 is arranged in the middle and lower part inside the inner cylinder 711. The water flow flows down from the upper end of the inner cylinder 711 to form a half-meter water head, which can achieve the effect of filtering the water flow through the ultrafiltration cylinder 811 without pumping. The water flow is filtered from the outer wall of the ultrafiltration cylinder 811 into the inside of the ultrafiltration cylinder 811 to obtain purified water, and the purified water flows into the purified water tank 4 through the drain pipe 814 for storage. During the filtration process, the water flow can also be irradiated by the ultraviolet lamp 10 to achieve the effect of sterilization and disinfection. After using for a period of time, it is necessary to clean the coarse filtration layer 712 and the ultrafiltration cylinder 811. The cleaning can be achieved by air flow backwashing. Specifically, the valve at the lower water inlet end of the filter tank 3 is blocked, and a certain amount of water is left between the filter tank 3 and the inner cylinder 711 and inside the inner cylinder 711 to cover the coarse filtration layer 712 and the ultrafiltration cylinder 811. Then the air pump 913 is started to drive high-pressure gas to enter the first spray pipe 911 and the second spray pipe 912 through the air pipe 914 respectively. Through the first spray pipe 911, the ultrafiltration cylinder 811 can be inflated from the inside to the outside, and the impurities attached to the ultrafiltration cylinder 811 are flushed out to the space between the ultrafiltration cylinder 811 and the inner cylinder 711. Mixed with the water in the inner cylinder 711, the impurities on the ultrafiltration cylinder 811 are more likely to be detached, and there is a water flow buffer to reduce the damage of the air flow impact on the ultrafiltration cylinder 811. The sewage is discharged through the inner sewage outlet 815. The second spray pipe 912 impacts downward on the upper part of the coarse filtration layer 712 by rotating. Similarly, the coarse filtration layer 712 is in the water, and the impurities after backwashing can be mixed in the water and finally discharged from the outer sewage outlet 816 to ensure the backwashing effect. After the backwashing is completed, the inner sewage outlet 815 and the outer sewage outlet 816 are closed, the inside of the ultrafiltration cylinder 811 is communicated with the drain pipe 814, and the filter tank 3 can normally intake water to realize the filtration operation of the water flow.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A gravity - type ultra - filtration membrane multi - stage water purification device, characterized in that: Including, a raw water tank (1), a mixing tank (2), a filtration tank (3) and a purified water tank (4). The water outlet end of the raw water tank (1) is connected to the mixing tank (2), the filtration tank (3) and the purified water tank (4) in sequence through pipelines. One end of the mixing tank (2) is provided with a feeding tank (5) which contains a flocculant. The discharging end of the feeding tank (5) is provided with a quantitative feeding mechanism. A stirring shaft (6) is rotatably arranged in the mixing tank (2). Below the interior of the filtration tank (3), there is an inner cylinder (711). Between the inner wall of the filtration tank (3) and the outer wall of the inner cylinder (711), there is a coarse filtration layer (712). Between the filtration tank (3) above the coarse filtration layer (712) and the inner cylinder (711), there is a partition plate (713) which is provided with a plurality of one-way valves (714). Below the interior of the inner cylinder (711), there is an ultrafiltration cylinder (811). The upper and lower ends of the ultrafiltration cylinder (811) are respectively provided with an upper cover (812) and a lower cover (813). At the central position of the lower cover (813), there is a drain pipe (814) which is connected to the purified water tank (4). At the lower end of the inner cylinder (711), there is an inner sewage discharge port (815) which is connected to the outside. Below the filtration tank (3), there is an outer sewage discharge port (816). At the central position inside the ultrafiltration cylinder (811), there is a first spray pipe (911) which is assembled and connected to the upper cover (812). Above the coarse filtration layer (712), there is a second spray pipe (912). Outside the filtration tank (3), there is an air pump (913) which is connected to the first spray pipe (911) and the second spray pipe (912) respectively through an air pipe (914). Inside the inner cylinder (711), there is an ultraviolet lamp (10). Above the mixing tank (2), through a fixing frame (111), there is a water frame (112) which is arranged in a U-shaped structure. The two ends of the water frame (112) are respectively connected to the inside of one end of the raw water tank (1) and the mixing tank (2). Inside the water frame (112), there is a fan blade (113) which is rotatably arranged. The upper end of the stirring shaft (6) penetrates through the fixing frame (111) and the bottom of the water frame (112) and is linked with the fan blade (113). The coarse filtration layer (712) successively includes an anthracite filtration layer (131), a quartz sand filtration layer (132) and an activated carbon filtration layer (133) from bottom to top. The second spray pipe (912) has a plurality of them which are respectively located between the anthracite filtration layer (131), the quartz sand filtration layer (132) and the activated carbon filtration layer (133).

2. The gravity ultrafiltration membrane multi-stage water purification device according to claim 1, characterized in that, A plurality of baffles (211) are arranged at intervals inside the mixing tank (2). There are a plurality of stirring shafts (6) which are distributed at both ends and the central position of the mixing tank (2).

3. The gravity ultrafiltration membrane multi-stage water purification device according to claim 2, characterized in that, The quantitative feeding mechanism includes a sleeve (121), a rotating roller (122) and a first motor (123). The sleeve (121) is arranged below the feeding box (5) and communicated with the discharging end of the feeding box (5). There is a discharging port below the sleeve (121) and directly above one end of the mixing tank (2). The rotating roller (122) is rotatably arranged inside the sleeve (121), and its outer wall is slidably arranged with the inner wall of the sleeve (121). The rotating roller (122) is driven to rotate by the first motor (123). A plurality of quantitative grooves (124) are spaced apart on the side wall of the rotating roller (122).

4. The gravity ultrafiltration membrane multi-stage water purification device according to claim 1, characterized in that, At the central position of the upper cover (812), there is a central pipe (141) communicated with the air pipe (914). The lower end of the central pipe (141) is hermetically and rotatably connected to the upper end of the first spray pipe (911). A plurality of air holes (142) are evenly arranged on the first spray pipe (911). The air holes (142) are inclined with respect to the side wall of the first spray pipe (911). The central pipe (141) is a sealed rotating head.

5. The gravity ultrafiltration membrane multi-stage water purification device according to claim 4, characterized in that, On the inner wall of the filter box (3), there is a placement groove (151). Inside the placement groove (151), there is a ring frame (152) rotatably arranged in a sealed manner. A plurality of fixing rings (153) are arranged up and down inside the inner ring of the ring frame (152). The fixing rings (153) are assembled and connected to the second spray pipe (912). Outside the filter box (3), there is a second motor (154). The output end of the second motor (154) is linked with an external gear (155). On the outer wall of the ring frame (152), there is a toothed ring (156). On the side wall of the filter box (3), there is an internal gear (157) meshed with the toothed ring (156). The external gear (155) is meshed with the internal gear (157) on one side.

6. The gravity ultrafiltration membrane multi-stage water purification device according to claim 5, characterized in that, On the inner wall of the filter box (3), there is a rotating ring (161) rotatably arranged. The inner side of the rotating ring (161) is engaged and rotatably arranged with the outer wall of the partition plate (713). The output end of the air pipe (914) is located at the central position above the inside of the filter box (3). The output end of the air pipe (914) is provided with a first connecting pipe (163) and a second connecting pipe (164) through a rotary joint (162). The first connecting pipe (163) and the second connecting pipe (164) are respectively communicated with the first spray pipe (911) and the second spray pipe (912). On the inner wall of the filter box (3) at the upper end of the inner cylinder (711), there is a ring rail (165). Below the ring rail (165), it is slidably connected to the second connecting pipe (164) through a slider (166).

7. The gravity ultrafiltration membrane multi-stage water purification device according to claim 6, characterized in that, At the upper end of the inner cylinder (711), there are a plurality of drainage ports (171). At the drainage ports (171), there are drainage plates (172) on the inner wall of the inner cylinder (711).

8. A gravity ultrafiltration membrane multi-stage water purification device according to claim 7, characterized in that, Outside the ultraviolet lamp (10), there is a waterproof cover (18). There are a plurality of waterproof covers (18) arranged on the inner wall and above of the filter box (3).

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