Gravity type ultrafiltration membrane multistage water purification equipment

Abstract

The invention discloses gravity type ultrafiltration membrane multistage water purification equipment, and relates to the technical field of water purification equipment, the gravity type ultrafiltration membrane multistage water purification equipment comprises a raw water tank, a mixing pool, a filtering tank and a water purification tank, the water outlet end of the raw water tank is sequentially communicated with the mixing pool, the filtering tank and the water purification tank through pipelines, one end of the mixing pool is provided with a feeding box, and a flocculating agent is arranged in the feeding box; a coarse filtering layer is arranged between the inner wall of the filtering box and the outer wall of the inner cylinder; a partition plate is arranged between the filtering box above the coarse filtering 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 arranged at the upper end and the lower end of the ultrafiltration cylinder respectively, a drainage pipe communicated with the water purification tank is arranged at the center of the lower cover, and an inner drain outlet communicated with the outside is formed in the lower end of the inner cylinder. The air pump blows air to the ultra-filtration cylinder and the coarse filtration layer, and the effect of cleaning the filtration structure is achieved through gas backwashing.

Description

Technical Field

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

[0002] Algae are a common organic pollutant in water bodies. Their growth and reproduction will cause the deterioration of water color, turbidity, odor and other indicators, affecting the safety and beauty of water quality, and will also increase the difficulty and cost of water treatment. At present, the commonly used methods for algae removal in water are mainly physical, chemical and biological methods.

[0003] The physical method is to separate algae from the water body by means of filtration, sedimentation, flotation, etc., but this method cannot completely remove algae, and will produce a large amount of sludge, which requires further treatment; the chemical method is to use chemical agents such as oxidants, flocculants, algaecides, etc. to kill or coagulate algae, and then remove them by means of filtration or sedimentation, but 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 is to use microorganisms, aquatic plants, fish and other organisms to biodegrade or prey on algae, but this method takes a long time, 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 semi-permeable membrane to intercept suspended solids, colloids, microorganisms, etc. in water. It has the advantages of simple operation, high efficiency, small footprint, and low energy consumption. However, when ultrafiltration membrane treats water containing algae, it will face the problem of membrane pollution, that is, algae and its metabolites will form a pollution layer on the membrane surface or in the membrane pores, resulting in a decrease in membrane flux, an increase in membrane resistance, and a shortened membrane life.

[0005] In order to solve the problem of membrane fouling, it is usually necessary to clean the ultrafiltration membrane. Chemical cleaning is the most commonly used method, which is to use chemical agents such as acids, alkalis, oxidants, etc. to dissolve or oxidize the pollutants on the membrane surface or in the membrane pores, thereby restoring the performance of the membrane.

[0006] For example, a gravity-type ultrafiltration membrane short-process water purification device as described in "CN118343869A" comprises: 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 plate is fixedly installed on the inner wall of the water purification device housing located above the filter screen. The present invention controls the air pump to start by a controller, so that the gas can be transported to the compression chamber of the pneumatic telescopic rod through the air inlet pipe and the connecting pipe in sequence, so that the air outlet pipe can be extended, and the movable bar is pushed to move to one side along the outer surface of the guide member, and the brush plate is simultaneously driven to move to one side to clean the larger impurities at the bottom of the filter screen, and the movable bar is simultaneously moved back along the outer surface of the guide member under the reset force of the compression spring, so that the larger impurities at the bottom of the filter screen can be cleaned, thereby increasing the speed at which water passes through the ultrafiltration membrane filaments, and further improving the filtering effect of the device.

[0007] However, traditional ultrafiltration membrane equipment has the following problems: regular chemical cleaning is required, the consumption and treatment costs of chemical agents are high, chemical agents may damage membrane materials, increase the complexity and cost of equipment operation and maintenance, and cause secondary pollution to the environment; a long water treatment process is required, which occupies a large amount of land space, which is not conducive to the renovation 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 that chemical cleaning of ultrafiltration membrane is commonly used in the prior art, but the cost of chemical cleaning is high and the chemical agents may cause damage to the membrane material.

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0011] On the one hand, the present invention provides a gravity-type ultrafiltration membrane multi-stage water purification equipment, which includes a raw water tank, a mixing tank, a filter box and a clean water tank, the water outlet end of the raw water tank is connected to the mixing tank, the filter box and the clean water tank in sequence through a pipeline, one end of the mixing tank is provided with a feeding box, the feeding box has a built-in flocculant, the discharge end of the feeding box is provided with a quantitative feeding mechanism, a stirring shaft is provided for rotation in the mixing tank, an inner cylinder is provided at the lower part of the filter box, a coarse filter layer is provided between the inner wall of the filter box and the outer wall of the inner cylinder, a partition is provided between the filter box above the coarse filter layer and the inner cylinder, and a multi-layer filter is provided on the partition a one-way valve, an ultrafiltration cartridge is provided at the lower part of the inner cylinder, an upper cover and a lower cover are respectively provided at the upper and lower ends of the ultrafiltration cartridge, a drain pipe connected to the clean water tank is provided at the center of the lower cover, an internal sewage outlet connected to the outside is provided at the lower end of the inner cylinder, an external sewage outlet is provided at the bottom of the filter box, a first nozzle is provided at the center of the ultrafiltration cartridge, the first nozzle is assembled and connected to the upper cover, a second nozzle is provided above the coarse filter layer, an air pump is provided outside the filter box, the air pump is connected to the first nozzle and the second nozzle through an air pipe, and an ultraviolet lamp is provided inside the inner cylinder.

[0012] Furthermore, a water rack is provided above the mixing pool through a fixed frame, and the water rack is arranged in a U-shaped structure. The two ends of the water rack are respectively connected to the raw water tank and one end of the mixing pool. Fan blades are rotatably provided inside the water rack, and the upper end of the stirring shaft passes through the fixed frame and the bottom of the water rack and is linked to the fan blades. When the water in the raw water tank passes through the water rack, the water flow drives the fan blades to rotate, and then drives the stirring shaft to rotate, so that the flocculant added to the water is fully mixed with the water flow, and the water discharged from the water rack directly flows into the mixing pool.

[0013] Furthermore, a plurality of baffles are provided at intervals inside the mixing pool, and a plurality of stirring shafts are provided and distributed at both ends and the center of the mixing pool. The baffles are provided to increase the effect of the mixed liquid flowing up and down in the mixing pool, and the mixing efficiency and mixing quality can be improved by combining with a plurality of rotating stirring shafts.

[0014] Furthermore, the quantitative unloading mechanism includes a sleeve, a roller and a first motor. The sleeve is arranged below the feeding box and is connected to the discharge end of the feeding box. A discharge port is provided below the sleeve and is located directly above one end of the mixing pool. The roller is rotatably arranged inside the sleeve and the outer wall and the inner wall of the sleeve are slidably arranged. The roller is driven to rotate by the first motor. A plurality of quantitative grooves are spaced apart on the side wall of the roller. The first motor drives the roller to rotate. The quantitative groove located above is filled with flocculant dropped from the feeding box. As the roller rotates, the quantitative groove rotates to the bottom, and the flocculant in the quantitative groove drops into the mixing pool.

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

[0016] Furthermore, a central tube connected to the air pipe is provided at the center of the upper cover, the lower end of the central tube is sealed and rotatably connected to the upper end of the first nozzle, a plurality of air holes are evenly arranged on the first nozzle, the air holes are inclined to the side walls of the first nozzle, and the central tube is a sealed rotating head. When gas is introduced into the first nozzle and the gas is obliquely ejected from the air holes, the reaction force of the air jet is used to drive the first nozzle to rotate as a whole, thereby achieving uniform gas backwashing operation in all corners of the ultrafiltration cartridge.

[0017] Furthermore, the filter box has an inner wall provided with a placement groove, a ring frame is provided inside the placement groove for sealing and rotation, a plurality of fixed rings are provided above and below the inner ring of the ring frame, the fixed ring is assembled and connected with the second nozzle, a second motor is provided outside the filter box, an external gear is provided at the output end of the second motor, a gear ring is provided on the outer wall of the ring frame, an internal gear rotatably provided on the side wall of the filter box for meshing with the gear ring, the internal gear is meshed on one side of the external gear, the external gear is driven to rotate by the second motor, the internal gear and the gear ring are driven to rotate, the ring frame is rotated, the second nozzle arranged on the fixed ring is driven to rotate, and the second nozzle is rotated during the backwashing process to realize rotational flushing, thereby ensuring all-round flushing of the coarse filter layer.

[0018] Furthermore, a swivel is rotatably provided on the inner wall of the filter box, and the inner side of the swivel is clamped and rotatably arranged with the outer wall of the partition, and the air pipe output end is located at the upper center position of the interior of the filter box, and the air pipe output end is provided with a first connecting pipe and a second connecting pipe through a rotating joint, and the first connecting pipe and the second connecting pipe are connected to the first nozzle and the second nozzle respectively, and a ring rail is provided on the inner wall of the filter box located at the upper end of the inner cylinder, and the lower part of the ring rail is slidably connected to the second connecting pipe through a slider, and the rotating joint is arranged to drive the second nozzle, the second connecting pipe and the swivel to rotate when the ring frame rotates, so as to prevent the pipeline from being entangled, and 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 a 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 A schematic diagram of the internal structure of a mixing tank of a gravity-type ultrafiltration membrane multi-stage water purification device provided by the present invention;

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

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

[0031] Figure 5 A schematic diagram of the internal structure of a filter box of a gravity-type ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0032] Figure 6 A schematic diagram of the assembly of a filter box and an inner cylinder of a gravity-type ultrafiltration membrane multi-stage water purification device provided by the present invention;

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

[0034] Figure 8 A schematic diagram of the filter box and placement tank position of a gravity-type ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0035] Fig. 9 A schematic diagram of the internal structure of an inner cylinder of a gravity-type ultrafiltration membrane multi-stage water purification device provided by the present invention;

[0036] Fig.10 A schematic diagram of the internal structure of an ultrafiltration cartridge of a gravity-type ultrafiltration membrane multi-stage water purification device provided by the present invention.

[0037] Legend:

[0038] 1. Raw water tank; 2. Mixing tank; 3. Filter box; 4. Clean water tank; 5. Feeding box; 6. Stirring shaft; 711. Inner cylinder; 712. Coarse filter layer; 713. Partition plate; 714. One-way valve; 811. Ultrafiltration cartridge; 812. Upper cover; 813. Lower cover; 814. Drain pipe; 815. Internal sewage outlet; 816. External sewage outlet; 911. First nozzle; 912. Second nozzle; 913. Air pump; 914. Air pipe; 10. Ultraviolet lamp; 111. Fixing frame; 112. Water rack; 113. Fan blade; 121. Sleeve; 122. Roller; 123. The first motor; 124, quantitative slot; 131, anthracite filter layer; 132, quartz sand filter layer; 133, activated carbon filter layer; 141, central tube; 142, air hole; 151, placement slot; 152, ring frame; 153, fixed ring; 154, second motor; 155, outer gear; 156, gear ring; 157, inner gear; 161, swivel; 162, rotary joint; 163, first connecting pipe; 164, second connecting pipe; 165, ring rail; 166, slider; 171, drainage port; 172, drainage plate; 18, waterproof cover; 211, baffle. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

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

[0042] See also Figure 1-Figure 10The present invention provides a technical solution: a gravity-type ultrafiltration membrane multi-stage water purification device, comprising a raw water tank 1, a mixing tank 2, a filter box 3 and a clean water tank 4, wherein the outlet end of the raw water tank 1 is connected to the mixing tank 2, the filter box 3 and the clean water tank 4 in sequence through a pipeline, a feeding box 5 is provided at one end of the mixing tank 2, the feeding box 5 has a built-in flocculant, and a quantitative feeding mechanism is provided at the discharge end of the feeding box 5, a stirring shaft 6 is provided for rotation in the mixing tank 2, an inner cylinder 711 is provided at the lower part of the filter box 3, a coarse filter layer 712 is provided between the inner wall of the filter box 3 and the outer wall of the inner cylinder 711, a partition 713 is provided between the filter box 3 and the inner cylinder 711 above the coarse filter layer 712, a plurality of one-way valves 714 are provided on the partition 713, and a plurality of one-way valves 714 are provided on the inner cylinder 711. An ultrafiltration cartridge 811 is provided at the bottom, and an upper cover 812 and a lower cover 813 are provided at the upper and lower ends of the ultrafiltration cartridge 811 respectively. A drain pipe 814 connected to the clean water tank 4 is provided at the center of the lower cover 813. An internal sewage outlet 815 connected to the outside is provided at the lower end of the inner cylinder 711. An external sewage outlet 816 is provided at the bottom of the filter box 3. A first nozzle 911 is provided at the center of the ultrafiltration cartridge 811, and the first nozzle 911 is assembled and connected to the upper cover 812. A second nozzle 912 is provided above the coarse filter layer 712. An air pump 913 is provided outside the filter box 3, and the air pump 913 is connected to the first nozzle 911 and the second nozzle 912 through an air pipe 914, and an ultraviolet lamp 10 is provided inside the inner cylinder 711.

[0043] like Figure 1-Figure 10 As shown, a water rack 112 is provided above the mixing pool 2 through a fixed rack 111. The water rack 112 is arranged in a U-shaped structure. The two ends of the water rack 112 are respectively connected to the raw water tank 1 and one end of the mixing pool 2. A fan blade 113 is provided inside the water rack 112 for rotation. The upper end of the stirring shaft 6 passes through the fixed rack 111 and the bottom of the water rack 112 and is linked to the fan blade 113. When the water in the raw water tank 1 passes through the water rack 112, the water flow drives the fan blade 113 to rotate, and then drives the stirring shaft 6 to rotate, so that the flocculant added to the water is fully mixed with the water flow, and the water discharged from the water rack 112 directly flows into the mixing pool 2.

[0044] like Figure 1-Figure 10 As shown, a plurality of baffles 211 are provided at intervals inside the mixing pool 2, and a plurality of stirring shafts 6 are provided and distributed at both ends and the center of the mixing pool 2. The baffles 211 are provided to increase the effect of the mixed liquid flowing up and down in the mixing pool 2. Combined with the plurality of rotating stirring shafts 6, the mixing efficiency and mixing quality can be improved.

[0045] like Figure 1-Figure 10As shown, the quantitative unloading mechanism includes a sleeve 121, a roller 122 and a first motor 123. The sleeve 121 is arranged below the loading box 5 and is connected to the discharge end of the loading box 5. A discharge port is arranged below the sleeve 121 and is located directly above one end of the mixing tank 2. The roller 122 is rotatably arranged inside the sleeve 121 and the outer wall and the inner wall of the sleeve 121 are slidably arranged. The 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 roller 122. The first motor 123 is driven to rotate to drive the roller 122 to rotate. The quantitative groove 124 located above is filled with flocculant dropped from the loading box 5. As the roller 122 rotates, the quantitative groove 124 rotates to the bottom, and the flocculant in the quantitative groove 124 drops into the mixing tank 2.

[0046] like Figure 1-Figure 10 As shown, the coarse filter layer 712 includes an anthracite filter layer 131, a quartz sand filter layer 132 and an activated carbon filter layer 133 from bottom to top, and the second nozzle 912 is provided with a plurality of nozzles respectively located between the anthracite filter layer 131, the quartz sand filter layer 132 and the activated carbon filter layer 133. The anthracite filter layer 131 is used to intercept larger particles and algae, the quartz sand filter layer 132 is used to remove medium-sized particles and suspended algae, and the activated carbon filter layer 133 is used for deep filtration and adsorption of organic matter and odors. The second nozzle 912 is provided with a plurality of nozzles that can flush each filter layer to achieve a better cleaning effect.

[0047] like Figure 1-Figure 10 As shown, a central tube 141 connected to the air pipe 914 is provided at the center of the upper cover 812, and the lower end of the central tube 141 is sealed and rotatably connected to the upper end of the first nozzle 911. A plurality of air holes 142 are evenly arranged on the first nozzle 911, and the air holes 142 are inclined to the side walls of the first nozzle 911. The central tube 141 is a sealed rotating head. When gas is introduced into the first nozzle 911 and the gas is obliquely ejected from the air holes 142, the reaction force of the air jet is used to push the first nozzle 911 to rotate as a whole, so as to achieve uniform gas backwashing operation on all corners of the ultrafiltration cartridge 811.

[0048] like Figure 1-Figure 10As shown, a placement groove 151 is provided on the inner wall of the filter box 3, and a ring frame 152 is provided inside the placement groove 151 for sealing and rotation. A plurality of fixing rings 153 are provided on the upper and lower inner rings of the ring frame 152, and the fixing ring 153 is assembled and connected with the second nozzle 912. A second motor 154 is provided on the outside of the filter box 3, and an external gear 155 is provided at the output end of the second motor 154 in linkage. A gear ring 156 is provided on the outer wall of the ring frame 152, and an internal gear 157 meshing with the gear ring 156 is rotatably provided on the side wall of the filter box 3. The internal gear 157 is meshed on one side of the external gear 155. The external gear 155 is driven to rotate by the second motor 154, and the internal gear 157 and the gear ring 156 are driven to rotate, so as to realize the rotation of the ring frame 152, and drive the second nozzle 912 arranged on the fixing ring 153 to rotate, so as to realize the rotation flushing of the second nozzle 912 during the backwashing process, and ensure the all-round flushing of the coarse filter layer 712.

[0049] like Figure 1-Figure 10 As shown, a swivel 161 is rotatably provided on the inner wall of the filter box 3, and the inner side of the swivel 161 is rotatably arranged with the outer wall of the partition 713, and the output end of the air pipe 914 is located at the upper center position inside the filter box 3, and the output end of the air pipe 914 is provided with a first connecting pipe 163 and a second connecting pipe 164 through a rotating joint 162, and the first connecting pipe 163 and the second connecting pipe 164 are connected with the first nozzle 911 and the second nozzle 912 respectively. A ring rail 165 is provided on the inner wall of the filter box 3 located at the upper end of the inner cylinder 711, and the lower part of the ring rail 165 is slidably connected with the second connecting pipe 164 through a slider 166. The rotating joint 162 is provided, and when the ring frame 152 rotates, the second nozzle 912, the second connecting pipe 164 and the swivel 161 are driven to rotate to prevent the pipeline from being entangled. The high-pressure gas output by the air pump 913 enters the first nozzle 911 and the second nozzle 912 through the first connecting pipe 163 and the second connecting pipe 164 respectively, and is finally ejected at high pressure to achieve a backwashing effect.

[0050] like Figure 1-Figure 10 As shown, a drainage port 171 is provided at the upper end of the inner cylinder 711 , and a plurality of drainage ports 171 are provided. A drainage plate 172 is provided on the inner wall of the inner cylinder 711 at the drainage port 171 , and water flows from the drainage port 171 into the inner cylinder 711 through the provided drainage port 171 .

[0051] like Figure 1-Figure 10 As shown, a waterproof cover 18 is provided outside the ultraviolet lamp 10. There are multiple waterproof covers 18 and they are arranged on the inner wall and the top of the filter box 3. The waterproof cover 18 is used to waterproof the ultraviolet lamp 10 to prevent water from entering the interior.

[0052] Working principle: When the water inlet operation is performed, the water in the raw water tank 1 is pumped into the water rack 112. The water flow in the water rack 112 drives the fan blades 113 to rotate, and then drives the stirring shaft 6 to rotate. The water flow is finally discharged from the other end of the water rack 112 into the mixing tank 2. When the water flows into 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 stirring of the partition 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 bottom of the filter box 3, and the water flows from bottom to top into the filter box 3 and the inner The space between the cylinders 711 is filtered through the coarse filter layer 712 in turn. This process can filter out particulate matter and obvious algae in the water and absorb organic matter. The water that has passed through the coarse filter layer 712 flows upward, passes through the one-way valve 714, and enters the inner cylinder 711 from the upper end. The ultrafiltration cylinder 811 is arranged in the lower middle part of the inner cylinder 711. The water 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 through the ultrafiltration cylinder 811 without pumping. The water flows from the outer wall of the ultrafiltration cylinder 811 into the interior of the ultrafiltration cylinder 811 to obtain clean water. The clean water flows from the drain pipe 814 into the clean water tank 4 for storage. During the filtration process, it can also be filtered by ultraviolet light. The line lamp 10 irradiates the water flow to achieve the effect of sterilization and disinfection. After a period of use, the coarse filter layer 712 and the ultrafiltration cartridge 811 need to be cleaned, which can be achieved by airflow backwashing. Specifically, the valve at the water inlet end below the filter box 3 is blocked, and a certain amount of water is left between the filter box 3 and the inner cylinder 711 and inside the inner cylinder 711 to cover the coarse filter layer 712 and the ultrafiltration cartridge 811. Then, the air pump 913 is started to drive the high-pressure gas to enter the first nozzle 911 and the second nozzle 912 through the air pipe 914 respectively. The ultrafiltration cartridge 811 can be blown from the inside to the outside through the first nozzle 911 to flush out the impurities attached to the ultrafiltration cartridge 811 to the ultrafiltration cartridge 811. The water in the inner cylinder 711 is mixed between the inner cylinder 711, making it easier for impurities on the ultrafiltration cylinder 811 to separate, and the buffering of water flow can reduce the damage of the airflow to the ultrafiltration cylinder 811, and the sewage is discharged through the inner sewage outlet 815. The second nozzle 912 impacts the upper part of the coarse filter layer 712 downward by rotating. Similarly, the coarse filter layer 712 is in the water, and the impurities after backwashing can be mixed with the water and finally discharged from the external sewage outlet 816 to ensure the backwashing effect. After the backwashing is completed, the inner sewage outlet 815 and the external sewage outlet 816 are closed, the interior of the ultrafiltration cylinder 811 is connected to the drain pipe 814, and the filter box 3 can normally take in water to realize the filtering 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 rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A gravity-type ultrafiltration membrane multi-stage water purification equipment, characterized in that: include, A raw water tank (1), a mixing tank (2), a filter box (3) and a clean water tank (4); the water outlet end of the raw water tank (1) is connected to the mixing tank (2), the filter box (3) and the clean water tank (4) in sequence through a pipeline; a feeding box (5) is provided at one end of the mixing tank (2); a flocculant is built into the feeding box (5); a quantitative feeding mechanism is provided at the discharge end of the feeding box (5); a stirring shaft (6) is rotatably provided in the mixing tank (2); an inner cylinder (711) is provided at the lower part of the filter box (3); a coarse filter layer (712) is provided between the inner wall of the filter box (3) and the outer wall of the inner cylinder (711); a partition (713) is provided between the filter box (3) and the inner cylinder (711) above the coarse filter layer (712); a plurality of one-way valves (714) are provided on the partition (713); an ultrafiltration cylinder (811) is provided at the lower part of the inner cylinder (711); The upper and lower ends of the ultrafiltration cartridge (811) are respectively provided with an upper cover (812) and a lower cover (813); a drainage pipe (814) connected to the clean water tank (4) is provided at the center of the lower cover (813); an internal sewage outlet (815) connected to the outside is provided at the lower end of the inner cylinder (711); an external sewage outlet (816) is provided below the filter box (3); a first nozzle (911) is provided at the center of the ultrafiltration cartridge (811); the first nozzle (911) is assembled and connected to the upper cover (812); a second nozzle (912) is provided above the coarse filter layer (712); an air pump (913) is provided outside the filter box (3); the air pump (913) is connected to the first nozzle (911) and the second nozzle (912) through an air pipe (914); and an ultraviolet lamp (10) is provided inside the inner cylinder (711).

2. A gravity-type ultrafiltration membrane multi-stage water purification equipment according to claim 1, characterized in that: A water frame (112) is provided above the mixing tank (2) via a fixed frame (111); the water frame (112) is arranged in a U-shaped structure; two ends of the water frame (112) are respectively connected to the interior of the raw water tank (1) and one end of the mixing tank (2); a fan blade (113) is rotatably provided inside the water frame (112); and the upper end of the stirring shaft (6) passes through the fixed frame (111) and the bottom of the water frame (112) and is arranged in linkage with the fan blade (113).

3. A gravity-type ultrafiltration membrane multi-stage water purification equipment according to claim 2, characterized in that: A plurality of baffles (211) are arranged at intervals inside the mixing tank (2), and a plurality of stirring shafts (6) are arranged and distributed at both ends and the center of the mixing tank (2).

4. A gravity-type ultrafiltration membrane multi-stage water purification equipment according to claim 3, characterized in that: The quantitative unloading mechanism comprises a sleeve (121), a roller (122) and a first motor (123); the sleeve (121) is arranged below the loading box (5) and is connected to the discharge end of the loading box (5); a discharge port is arranged below the sleeve (121) and is located directly above one end of the mixing tank (2); the 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 roller (122) is driven to rotate by the first motor (123); and a plurality of quantitative grooves (124) are spaced apart on the side wall of the roller (122).

5. A gravity-type ultrafiltration membrane multi-stage water purification equipment according to claim 4, characterized in that: The coarse filter layer (712) includes, from bottom to top, an anthracite filter layer (131), a quartz sand filter layer (132) and an activated carbon filter layer (133), and the second nozzle (912) is provided with a plurality of nozzles respectively located between the anthracite filter layer (131), the quartz sand filter layer (132) and the activated carbon filter layer (133).

6. A gravity-type ultrafiltration membrane multi-stage water purification equipment according to claim 5, characterized in that: A central tube (141) connected to the air pipe (914) is provided at the center of the upper cover (812); the lower end of the central tube (141) is sealed and rotatably connected to the upper end of the first nozzle (911); a plurality of air holes (142) are evenly arranged on the first nozzle (911); the air holes (142) are inclined to the side wall of the first nozzle (911); and the central tube (141) is a sealed rotating head.

7. A gravity-type ultrafiltration membrane multi-stage water purification equipment according to claim 6, characterized in that: The filter box (3) is provided with a placement groove (151) on its inner wall, a ring frame (152) is provided inside the placement groove (151) for sealing and rotation, a plurality of fixing rings (153) are provided on the upper and lower inner rings of the ring frame (152), the fixing ring (153) is assembled and connected with the second nozzle (912), a second motor (154) is provided outside the filter box (3), an external gear (155) is provided at the output end of the second motor (154), a gear ring (156) is provided on the outer wall of the ring frame (152), an internal gear (157) meshing with the gear ring (156) is rotatably provided on the side wall of the filter box (3), and the internal gear (157) is meshingly provided on one side of the external gear (155).

8. A gravity-type ultrafiltration membrane multi-stage water purification device according to claim 7, characterized in that: A rotating ring (161) is rotatably provided on the inner wall of the filter box (3), and the inner side of the rotating ring (161) is locked and rotatably arranged with the outer wall of the partition (713). The output end of the air pipe (914) is located at the upper center position inside 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 rotating joint (162). The first connecting pipe (163) and the second connecting pipe (164) are connected to the first nozzle (911) and the second nozzle (912) respectively. A ring rail (165) is provided on the inner wall of the filter box (3) located at the upper end of the inner cylinder (711), and the lower part of the ring rail (165) is slidably connected to the second connecting pipe (164) through a slider (166).

9. A gravity-type ultrafiltration membrane multi-stage water purification equipment according to claim 8, characterized in that: The upper end of the inner cylinder (711) is provided with a drainage port (171), a plurality of drainage ports (171) are provided, and a drainage plate (172) is provided on the inner wall of the inner cylinder (711) at the drainage port (171).

10. A gravity-type ultrafiltration membrane multi-stage water purification device according to claim 9, characterized in that: The ultraviolet lamp (10) is provided with a waterproof cover (18) outside, and a plurality of waterproof covers (18) are provided and are arranged on the inner wall and above the filter box (3).

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