A filtering device

Abstract

The present application provides a filtering device, including a cylindrical membrane pool, a filter membrane support, a top water collecting pipe, a bottom water collecting pipe and an annular water collector. The filter membrane support is arranged in the cylindrical membrane pool, including a plurality of sewage filtration membrane assemblies evenly arranged along the circumference. The top water collecting pipe and the bottom water collecting pipe are both annular, and a plurality of water collecting interfaces are evenly arranged along the circumference. The annular water collector is arranged between the top water collecting pipe and the bottom water collecting pipe, including an annular body and a plurality of connecting parts, and the connecting parts include an upper connecting pipe and a lower connecting pipe, which are respectively connected to the water collecting interfaces of the upper and bottom water collecting pipes. A plurality of guide baffles are arranged in the annular body to form an independent cavity, and the hydraulic characteristics are balanced by the water guide plates and guide assemblies in the cavity, thereby solving the problem of uneven water production of sewage filtration membrane assemblies at different positions. The filtering device provided by the present application can be used in sewage treatment scenarios.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a filtering device. Background Art

[0002] Filtration devices are widely used in sewage treatment scenarios. Existing filtration devices usually include a cylindrical membrane pool, a membrane support, an upper and lower water collecting pipe, and a connecting pipe. Among them, a plurality of sewage filtration membrane assemblies are arranged on the membrane support, and the upper and lower water collecting pipes are connected through a plurality of connecting pipes to collect and transport the filtered clean water.

[0003] However, due to the structural characteristics of the filtration device, there are differences in the length of the connecting pipes between the upper and lower water collecting pipes. Specifically, the connection distances between the sewage filtration membrane modules located at different positions and the upper and lower water collecting pipes are different, resulting in different lengths of the connecting pipes. This difference in the length of the connecting pipes will cause the following technical problems:

[0004] Connecting pipes of different lengths will produce different hydraulic resistances. The longer the connecting pipe, the greater the resistance encountered by the water flow; the shorter the connecting pipe, the smaller the resistance encountered by the water flow. This difference in hydraulic resistance will lead to uneven water production of sewage filtration membrane components at different positions, that is, under the same driving pressure, the sewage filtration membrane component connected to the short connecting pipe has a larger water production, while the sewage filtration membrane component connected to the long connecting pipe has a smaller water production. The uneven water production of the sewage filtration membrane component will reduce the filtration efficiency of the entire filtration device. Since the water production of some sewage filtration membrane components is small, the filtration capacity of these sewage filtration membrane components is not fully utilized, while other sewage filtration membrane components may accelerate membrane pollution due to excessive water production, ultimately leading to a decrease in the performance of the entire filtration system. In addition, the unbalanced hydraulic characteristics caused by the difference in the length of the connecting pipe will also affect the cleaning effect during the backwashing process, so that some sewage filtration membrane components cannot be fully backwashed, aggravating the unevenness of the degree of membrane pollution.

[0005] Therefore, it is necessary to propose a new technical solution to solve the above technical problems. Summary of the invention

[0006] The purpose of the present application is to provide a filtering device to solve the technical problem that in the existing filtering device, due to the different lengths of connecting pipes, the hydraulic resistance of each sewage filtration membrane assembly is different, thereby causing uneven water production of sewage filtration membrane assemblies at different positions.

[0007] The embodiment of the present application provides a filtering device, comprising: a cylindrical membrane pool; a filter membrane support arranged in the cylindrical membrane pool, the filter membrane support comprising a plurality of sewage filtration membrane assemblies uniformly arranged along the circumference of the filter membrane support; a bottom water collecting pipe; a top water collecting pipe; and an annular water collector, the annular water collector being arranged between the top water collecting pipe and the bottom water collecting pipe, the annular water collector comprising an annular body and a plurality of connecting pieces, the connecting pieces being arranged on the outer peripheral surface of the annular body, the connecting pieces comprising an upper connecting pipe and a lower connecting pipe, the upper connecting pipe being connected to the top water collecting pipe The lower connecting pipe is connected with the bottom water collecting pipe, a plurality of guide baffles are arranged in the annular body, and an independent cavity is formed between adjacent guide baffles, the end of the upper connecting pipe is provided with a third annular groove matched with the second water collecting interface, and the third sealing gasket is embedded in the third annular groove, the end of the lower connecting pipe is provided with a fourth annular groove matched with the first water collecting interface, and the fourth sealing gasket is embedded in the fourth annular groove, the upper connecting pipe and the lower connecting pipe are fixedly connected with the corresponding second water collecting interface and the first water collecting interface through clamps.

[0008] In the above-mentioned filtering device, the annular water collector is in a circular ring shape, the axis of the annular water collector coincides with the axes of the top water collecting pipe and the bottom water collecting pipe, the cross-section of the annular body is rectangular, and the connecting parts are evenly distributed along the circumference of the annular body.

[0009] In the above-mentioned filtering device, the axes of the upper connecting pipe and the lower connecting pipe are located in the same radial plane, the lengths of the upper connecting pipe and the lower connecting pipe are equal, and the inner diameters of the upper connecting pipe and the lower connecting pipe are equal.

[0010] In the above-mentioned filtering device, the guide baffle is arranged along the circumference of the annular body, the guide baffle is fan-shaped, the inner edge of the guide baffle is fixedly connected to the inner wall of the annular body, and the outer edge of the guide baffle is fixedly connected to the outer wall of the annular body.

[0011] In the above-mentioned filtering device, each of the cavities includes a water inlet area and a water outlet area, the water inlet area is connected to the upper connecting pipe, and the water outlet area is connected to the lower connecting pipe. A water guide plate is arranged between the water inlet area and the water outlet area, and the water guide plate is arc-shaped. The two ends of the water guide plate are respectively fixedly connected to the adjacent guide baffles.

[0012] In the above-mentioned filtration device, the water guide plate divides the cavity into an upper area and a lower area, the volume of the upper area is larger than the volume of the lower area, and a plurality of water guide holes are arranged on the water guide plate, and the water guide holes are evenly distributed along the circumference of the water guide plate.

[0013] In the above-mentioned filtering device, for the communication path between the top water collecting pipe and the bottom water collecting pipe whose connection positions are far apart, the volume of the corresponding cavity is relatively large; for the communication path between the top water collecting pipe and the bottom water collecting pipe whose connection positions are close to each other, the volume of the corresponding cavity is relatively small.

[0014] In the above-mentioned filtering device, a first guide component is arranged in the water inlet area of ​​each of the cavities, and the first guide component includes a plurality of radial guide plates, and the radial guide plates are evenly arranged along the circumference of the water inlet area, the inner ends of the radial guide plates are fixedly connected to the inner walls of the annular body, and the outer ends of the radial guide plates are fixedly connected to the water guide plates, and drainage channels are formed between adjacent radial guide plates, and the cross-sectional area of ​​the drainage channels gradually increases from the connection point of the upper connecting pipe to the water guide plate.

[0015] In the above-mentioned filtering device, a second guide component is arranged in the water outlet area of ​​each of the cavities, and the second guide component includes a plurality of annular guide plates, and the annular guide plates are arranged radially along the water outlet area, and the two ends of the annular guide plates are respectively fixedly connected to the adjacent guide baffles, and a drainage channel is formed between the adjacent annular guide plates, and the cross-sectional area of ​​the drainage channel gradually decreases from the water guide plate to the connection with the lower connecting pipe.

[0016] In the above-mentioned filtering device, the curvature of the water guide plate is the same as the curvature of the inner wall of the annular body, and the thickness of the water guide plate gradually decreases from the middle to both ends.

[0017] The filtration device of the present application achieves a balance of the hydraulic resistance of sewage filtration membrane assemblies at different positions by setting an annular water collector between the top water collecting pipe and the bottom water collecting pipe. Specifically, the setting of the annular water collector divides the original long connecting pipe into two shorter connecting pipes, upper and lower, which significantly reduces the difference in the length of the connecting pipes. Since the length and inner diameter of the upper connecting pipe and the lower connecting pipe are equal, the resistance encountered by the water flow in these connecting pipes is basically the same, thereby reducing the difference in hydraulic resistance caused by the difference in the length of the connecting pipes. At the same time, by setting a guide baffle in the annular body of the annular water collector to form an independent cavity, the balance of the hydraulic characteristics of different connecting paths is achieved, ensuring that each sewage filtration membrane assembly obtains a similar water production, which is beneficial to providing sewage treatment and water resource recycling effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of a filtering device provided in an embodiment of the present application.

[0019] Figure 2 It is a top view of the filtering device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0021] The terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise clearly defined.

[0022] The embodiments of the present application may be combined with each other.

[0023] like Figure 1 and Figure 2 As shown, the present application provides a filtration device, including a cylindrical membrane pool 101, a filter membrane support, a bottom water collecting pipe 104, a top water collecting pipe 105, a main water collecting pipe 106, a flexible pipe 107, a water outlet port 108, a self-priming water production pump, a reverse flushing pump and a driving device.

[0024] The cylindrical membrane pool 101 includes a pool body, a top opening, a side wall and a bottom wall. The pool body is cylindrical as a whole, wherein the side wall is cylindrical and the bottom wall is conical. A plurality of detection ports are arranged on the side wall, and the detection ports are used to install a liquid level sensor, a pressure sensor and a temperature sensor. A water outlet port 108 is arranged on the upper part of the side wall, and the water outlet port 108 is connected to an external pipeline through a flange. The bottom wall and the side wall are integrally formed or fixedly connected by welding. The bottom wall is conical in design, and the taper angle is 30-60 degrees. This conical structure allows the dirt in the membrane pool to naturally gather to the bottom center under the action of gravity, which is convenient for the collection and discharge of dirt. A sewage discharge port is arranged at the lowest point of the bottom wall, and the sewage discharge port is connected to the sewage discharge pipe through a flange, and a sewage discharge electromagnetic valve 115 is arranged on the sewage discharge pipe. The diameter of the top opening is the same as that of the side wall. A sealing gasket groove is arranged at the top opening, and a corrosion-resistant rubber sealing gasket is installed in the sealing gasket groove. The top opening is sealed by a removable top cover. The top cover is provided with a plurality of through holes for installing components such as a drive device and a water collection pipeline. The top cover is detachably connected to the flange on the side wall by bolts to facilitate the installation, inspection and maintenance of the equipment. A support platform is provided at the bottom of the cylindrical membrane pool 101. The support platform includes a plurality of support columns, which are evenly distributed along the circumference of the cylindrical membrane pool 101, and an adjustment bolt is provided at the bottom of each support column for adjusting the horizontality of the cylindrical membrane pool 101.

[0025] A plurality of water guide plates are arranged inside the cylindrical membrane pool 101, and the water guide plates are evenly arranged along the circumference of the inner wall of the cylindrical membrane pool 101 to guide the water flow to form a reasonable flow field distribution. Each water guide plate is in the shape of a rectangular plate, and the length direction of the water guide plate is parallel to the axial direction of the cylindrical membrane pool 101. The radial length of the water guide plate is less than the distance between the inner wall of the cylindrical membrane pool 101 and the outermost sewage filtration membrane assembly 103 of the membrane support to ensure that a safe gap is left between the water guide plate and the rotating membrane support. The water guide plate is fixedly connected to the inner wall of the cylindrical membrane pool 101 through a plurality of fixing frames, and the fixing frames are evenly distributed along the length direction of the water guide plate. The fixing frame is L-shaped, and the vertical part of the fixing frame is fixedly connected to the inner wall of the cylindrical membrane pool 101 by bolts, and the horizontal part is fixedly connected to the water guide plate by bolts. A plurality of water guide holes are arranged on the surface of the water guide plate, and the water guide holes are circular, and the water guide holes are evenly distributed along the length direction and width direction of the water guide plate. The water-facing surface of the water guide plate forms a certain angle with the radial direction of the cylindrical membrane pool 101. The setting of this angle enables the water flow to generate a tangential component when flowing through the water guide plate, thereby forming a uniform water flow distribution in the cylindrical membrane pool 101 and improving the filtering effect. The axial length of the water guide plate is less than the distance between the upper and bottom water collecting pipes. The water guide plate is arranged in the area between the upper and bottom water collecting pipes to avoid interference with the upper and bottom water collecting pipes. A support bearing is arranged at the center of the cylindrical membrane pool 101. The support bearing is fixedly connected to the bottom wall and is used to support the rotating rod 109 of the filter membrane bracket and ensure its rotation stability. A sealing member is arranged on the upper part of the support bearing to prevent sewage from entering the interior of the bearing.

[0026] The membrane support is arranged in the cylindrical membrane pool 101, and the membrane support includes a plurality of sewage filtration membrane assemblies 103 evenly arranged along the circumference of the membrane support, and the sewage filtration membrane assemblies 103 are used to filter the raw water entering the cylindrical membrane pool 101. The membrane support is provided with a rotating rod 109, and the rotating rod 109 is connected to the cylindrical membrane pool 101 through a support bearing, and the support bearing is used to support the rotation of the membrane support. The plurality of sewage filtration membrane assemblies 103 are arranged at equal angles along the circumference of the membrane support to ensure that each sewage filtration membrane assembly 103 is evenly stressed.

[0027] The membrane support is arranged in the cylindrical membrane pool 101, and the membrane support includes a rotating rod 109, a support rod 102 and a sewage filtration membrane assembly 103. A bearing sleeve is arranged at the bottom end of the rotating rod 109, and the bearing sleeve and the support bearing are interference fit to ensure the stability of rotation. The support bearing is fixed on the bearing frame at the bottom of the cylindrical membrane pool 101, and the bearing frame is fixedly connected to the bottom wall of the cylindrical membrane pool 101 by expansion bolts. A flange is arranged at the top of the rotating rod 109, and the flange is connected to the output shaft of the driving device by bolts for transmitting driving force. The support rods 102 are evenly distributed along the circumference of the rotating rod 109, and the angles between adjacent support rods 102 are equal to ensure uniform force. The cross section of each support rod 102 is I-shaped, and the upper and lower flanges of the support rod 102 are vertically connected to the web. This structure provides higher strength and rigidity. The inner end of the support rod 102 is fixedly connected to the outer wall of the rotating rod 109 through an annular weld, and the annular weld is continuously arranged along the circumference of the inner end of the support rod 102 to ensure the connection strength. The outer end of the support rod 102 is provided with a reinforcing rib, which is triangular in shape, one right-angled side of the reinforcing rib is fixedly connected to the upper surface of the support rod 102, and the other right-angled side is fixedly connected to the outer end face of the support rod 102, and the hypotenuse of the reinforcing rib extends outward to enhance the structural strength of the support rod 102. A fixing seat is provided on the upper surface of each support rod 102, and the fixing seat is square in shape. The fixing seat is fixedly connected to the support rod 102 by a plurality of bolts. A limiting groove is provided on the upper surface of the fixing seat, and the limiting groove extends along the length direction of the fixing seat. A plurality of fastening holes are provided on the two side walls of the limiting groove, and the fastening holes are evenly distributed along the length direction of the limiting groove. The limiting groove is used to place the base of the sewage filtration membrane assembly 103, and the fastening hole is used to install the fastening bolts, which fix the base of the sewage filtration membrane assembly 103 in the limiting groove, thereby realizing the stable installation of the sewage filtration membrane assembly 103. The number of sewage filtration membrane assemblies 103 is the same as the number of support rods 102, and each sewage filtration membrane assembly 103 is correspondingly arranged on a support rod 102 to achieve uniform distribution and force balance.

[0028] Through the above technical solution, the support rod 102 can stably support the sewage filtration membrane assembly 103 to prevent the sewage filtration membrane assembly 103 from shaking during operation. At the same time, the setting of the limiting groove and fastening hole on the fixed seat facilitates the installation and positioning of the sewage filtration membrane assembly 103, thereby ensuring the installation accuracy of the sewage filtration membrane assembly 103.

[0029] The top water collecting pipe 105 is connected to the bottom water collecting pipe 104 through a plurality of connecting pipes, and the connecting pipes are used to transport the clean water filtered by the sewage filtration membrane assembly 103 from the bottom water collecting pipe 104 to the top water collecting pipe 105. The main water collecting pipe 106 is connected to the top water collecting pipe 105, and is used to collect the clean water in the top water collecting pipe 105. One end of the flexible pipe 107 is connected to the main water collecting pipe 106, and the other end is connected to the water outlet port 108 arranged on the inner wall of the cylindrical membrane pool 101, and the flexible pipe 107 is used to transport the clean water in the main water collecting pipe 106 to the water outlet port 108. The water outlet port 108 is provided with a first water outlet pipe and a second water outlet pipe, the first water outlet pipe is used for water production, and the second water outlet pipe is used for backwashing. The first water outlet pipe and the second water outlet pipe are arranged in parallel.

[0030] The bottom water collecting pipe 104 is arranged in the middle of the cylindrical membrane pool 101. The bottom water collecting pipe 104 is annular and has a circular cross section, which is used to collect the filtered clean water. The bottom water collecting pipe 104 is coaxially arranged with the rotating rod 109 and is fixedly connected with the rotating rod 109, and rotates with the rotating rod 109. The bottom water collecting pipe 104 is fixed on the rotating rod 109 through a plurality of support frames, and the support frames are evenly distributed along the circumference of the bottom water collecting pipe 104 to ensure the stability of the structure. A plurality of water collecting interfaces are evenly arranged along the circumference of the bottom water collecting pipe 104, and the water collecting interfaces are cylindrical, and an annular protrusion is arranged on the outer wall of the water collecting interface. An annular groove is arranged on the end face of each water collecting interface, and a sealing gasket is embedded in the annular groove. A connecting pipe is arranged at the lower end of the sewage filtration membrane assembly 103, and the connecting pipe is inserted into the water collecting interface. The outer wall of the connecting pipe is in close contact with the sealing gasket to form a sealed connection to prevent clean water leakage.

[0031] The top water collecting pipe 105 is arranged at the upper position of the cylindrical membrane pool 101, directly above the bottom water collecting pipe 104, and is used to receive the clean water transported from the bottom water collecting pipe 104. The top water collecting pipe 105 is also annular, and the cross section of the top water collecting pipe 105 is also circular. The top water collecting pipe 105 is coaxially arranged with the rotating rod 109 and is fixedly connected with the rotating rod 109, and rotates with the rotating rod 109. The top water collecting pipe 105 is fixed on the rotating rod 109 through a plurality of support frames, and the support frames are evenly distributed along the circumference of the top water collecting pipe 105 to ensure the structural stability. A plurality of water collecting interfaces are arranged around the top water collecting pipe 105, and the number of water collecting interfaces is the same as that of the water collecting interfaces of the bottom water collecting pipe 104, and the water collecting interfaces are evenly distributed along the circumference of the top water collecting pipe 105. The structure of each water collecting interface is the same as that of the water collecting interface of the bottom water collecting pipe 104, and the water collecting interface is sealed and connected with the upper end connecting pipe of the sewage filtration membrane assembly 103 through a sealing gasket. A plurality of air relief valves are arranged at the top of the top water collecting pipe 105, and the air relief valves are evenly distributed along the circumference of the top water collecting pipe 105. The air inlet of the air relief valve is connected with the inner cavity of the top water collecting pipe 105, and the air outlet of the air relief valve is arranged upward to discharge the gas accumulated in the system.

[0032] The main water collecting pipe 106 is arranged on one side of the top water collecting pipe 105. The main water collecting pipe 106 is in the shape of a straight pipe, and the cross section of the main water collecting pipe 106 is circular, and is used to collect clean water. The main water collecting pipe 106 is connected to the top water collecting pipe 105 through a tee joint. The main pipe of the tee joint is connected to the top water collecting pipe 105, and the branch pipe is connected to the main water collecting pipe 106. Sealing gaskets are provided at the connection between the tee joint and the top water collecting pipe 105 and the main water collecting pipe 106. The sealing gaskets are embedded in the annular groove on the end face of the tee joint to prevent clean water leakage.

[0033] The flexible tube 107 is made of flexible material to adapt to the displacement of the system during movement. Both ends of the flexible tube 107 are provided with connecting flanges. The connecting flange at one end of the flexible tube 107 is fixedly connected to the connecting flange at the end of the main water collecting pipe 106 by multiple bolts, and a sealing gasket is provided at the connection. The connecting flange at the other end of the flexible tube 107 is fixedly connected to the flange of the water outlet port 108 by multiple bolts, and a sealing gasket is also provided at the connection. The water outlet port 108 is tubular, and the water outlet port 108 is arranged on the upper part of the wall of the cylindrical membrane pool 101. The water outlet port 108 is fixed by welding the flange with the edge of the through hole opened on the wall of the cylindrical membrane pool 101. A sealing gasket is provided at the connection between the water outlet port 108 and the wall of the cylindrical membrane pool 101, and the sealing gasket is embedded in the annular groove on the flange of the water outlet port 108 to ensure the sealing of the system.

[0034] The water outlet port 108 is provided with a first water outlet pipe and a second water outlet pipe, which are used for water production and backwashing respectively. The water outlet port 108 is fixedly connected to the wall of the cylindrical membrane pool 101 through a flange, and a sealing gasket is provided at the connection to ensure sealing. The first water outlet pipe and the second water outlet pipe are arranged in parallel, and both are connected to the water outlet port 108 through a flange. A butterfly electric valve is provided on each of the two water outlet pipes to control the direction of water flow and realize the switching of water production and backwashing. The self-priming water production pump is connected to the first water outlet pipe through a flange to extract the filtered clean water. A check valve is provided at the inlet of the self-priming water production pump to prevent water backflow and protect the normal operation of the system. The reverse flushing pump is connected to the second water outlet pipe through a flange to provide backwashing water pressure. Pressure gauges are provided at the inlet and outlet of the reverse flushing pump to monitor the backwashing pressure. A Y-type filter is provided at the inlet of the reverse flushing pump to prevent impurities from entering the pump and protect the service life of the pump.

[0035] In the backwashing working state, the control system first closes the butterfly electric valve on the first outlet pipe and opens the butterfly electric valve on the second outlet pipe. Driven by the reverse flushing pump, the backwashing water enters the outlet port 108 through the second outlet pipe, and then passes through the flexible pipe 107, the main water collecting pipe 106, the top water collecting pipe 105, the connecting pipe, the bottom water collecting pipe 104 in sequence, and finally flows from the outside to the inside of the sewage filtration membrane assembly 103, flushing the surface of the sewage filtration membrane assembly 103 to achieve the removal of membrane pollution.

[0036] The self-priming water production pump is connected to the first water outlet pipe through the water production electromagnetic valve 113, and is used to pump clean water out of the cylindrical membrane pool 101. The reverse flushing pump is connected to the second water outlet pipe through the reverse flushing electromagnetic valve 114, and is used to inject backwash water into the cylindrical membrane pool 101. The driving device is used to drive the filter membrane support to reciprocate, and the driving device includes a swing rod 110 arranged above the filter membrane support, a motor 112, and a linkage rod 111 connected between the motor 112 and the swing rod 110. The motor 112 is provided with an eccentric wheel, and the eccentric wheel is connected to the first end of the linkage rod 111, and the second end of the linkage rod 111 is connected to the swing rod 110, and the swing rod 110 is connected to the filter membrane support.

[0037] There are multiple connecting pipes, and the multiple connecting pipes are evenly distributed along the circumference of the top water collecting pipe 105 to ensure that the water production of each sewage filtration membrane assembly 103 is uniform. The connecting pipe assembly includes multiple connecting pipes, which are vertically arranged and evenly distributed along the circumference of the upper and bottom water collecting pipes, and are used to connect the upper and lower water collecting pipes. The cross section of each connecting pipe is circular, and circular flanges are respectively provided at both ends of the connecting pipe. The flanges are connected to the corresponding flanges on the upper and bottom water collecting pipes through multiple bolts. An annular groove is provided on the connecting surface of the flange, and a sealing gasket is embedded in the annular groove to ensure the sealing of the connection. The connecting pipe is connected to the inner cavity of the upper and bottom water collecting pipes to form a through flow channel.

[0038] In actual operation, raw water is filtered through the sewage filtration membrane module 103 under the action of transmembrane pressure difference. The filtered clean water first enters the bottom water collecting pipe 104, and then flows upward through the connecting pipe to enter the top water collecting pipe 105. Then, the clean water is collected through the main water collecting pipe 106 and flows to the water outlet port 108 through the flexible pipe 107. Finally, the clean water is output through the water outlet pipeline connected to the water outlet port 108. This design realizes the effective collection and transportation of clean water.

[0039] Each sewage filter membrane assembly 103 includes a filter membrane housing and a plurality of hollow fiber membranes for filtering and purifying water. The cross section of the filter membrane housing is rectangular, and the four side walls of the filter membrane housing are connected by welding to form a whole to ensure structural strength and sealing. Cover plates are respectively provided on the top and bottom of the filter membrane housing, and the cover plates are fixedly connected to the end face of the filter membrane housing by bolts. A sealing gasket is provided at the connection between the cover plate and the filter membrane housing, and the sealing gasket is embedded in the annular groove on the cover plate to prevent leakage of clean water.

[0040] The hollow fiber membrane is vertically arranged in the membrane housing. The two ends of the hollow fiber membrane pass through the membrane wire holes on the top cover and the bottom cover respectively. The ends of the membrane wire are fixed in the membrane wire fixing area of ​​the cover by epoxy resin to form a stable filtration unit. The inner surfaces of the top cover and the bottom cover are both provided with a water collection channel. The water collection channel is annular and is connected to the drain port on the cover through multiple conducting holes. The water collection channel is used to collect the clean water after being filtered by the hollow fiber membrane and guide the clean water to the drain port.

[0041] The sewage filtration membrane assembly 103 is installed on the fixing seat of the support rod 102 through the fastening components. The fastening components include a top fixing seat and a bottom fixing seat, and the top fixing seat and the bottom fixing seat are respectively arranged on both sides of the filter membrane housing to form a fixing structure that is symmetrical up and down. The top fixing seat and the bottom fixing seat are both L-shaped, and the vertical parts of the top fixing seat and the bottom fixing seat are attached to the side wall of the filter membrane housing, and the horizontal parts are in contact with the fixing seat. Through holes are provided on the horizontal parts of the top fixing seat and the bottom fixing seat, and the positions of the through holes and the fastening holes on the fixing seat correspond. The bolts pass through the through holes of the top fixing seat, the fastening holes of the fixing seat and the through holes of the bottom fixing seat in turn, and are locked by nuts to fix the sewage filtration membrane assembly 103 on the fixing seat to ensure the stability of the installation.

[0042] Through the above technical solution, each sewage filtration membrane assembly 103 is evenly distributed in the circumferential direction. When the membrane support rotates, each sewage filtration membrane assembly 103 is evenly stressed, and the same water flow flushing effect can be obtained, thereby improving the filtration efficiency.

[0043] The driving device includes a swing rod 110, a motor 112 and a linkage rod 111, and these components work together to realize the reciprocating rotation of the filter membrane support. The swing rod 110 is in the shape of an elongated strip, and the cross section of the swing rod 110 is rectangular, and is used to transmit the driving force. A sleeve is provided at the center of the swing rod 110, and the sleeve is in the shape of a cylinder. A key groove is provided on the inner wall of the sleeve, and the key groove cooperates with the key on the rotating rod 109 of the filter membrane support. The sleeve is fixedly connected to the rotating rod 109 of the filter membrane support by a key connection method to ensure the reliability of the transmission.

[0044] The motor 112 is fixedly arranged at the top edge of the cylindrical membrane pool 101. The motor 112 is fixed to the support frame through a motor seat. The motor seat is L-shaped. The vertical part of the motor seat is fixedly connected to the support frame through a plurality of bolts, and the horizontal part is fixedly connected to the base of the motor 112 through a plurality of bolts to form a stable support structure. The output shaft of the motor 112 is connected to the eccentric wheel through a coupler. Coupler halves are respectively arranged at both ends of the coupler, and the two coupler halves are fixedly connected by a plurality of bolts. The eccentric wheel is disc-shaped, and the center hole of the eccentric wheel is interference-fitted with the output shaft of the motor 112. An eccentric shaft is arranged on the eccentric wheel, and the axis of the eccentric shaft is parallel to the axis of the eccentric wheel and there is a certain offset. The eccentric shaft is connected to the first end of the linkage rod 111 through a bearing to realize the conversion of rotational motion to reciprocating motion.

[0045] The cross section of the linkage rod 111 is an I-shaped one, and the upper and lower flanges of the linkage rod 111 are vertically connected to the web, providing sufficient structural strength. A bearing frame is provided at the first end of the linkage rod 111, and the bearing frame is cylindrical, and a bearing inner ring mounting step and a bearing outer ring mounting step are provided in the bearing frame. The bearing is installed in the bearing frame, and the inner ring of the bearing is interference-fitted with the eccentric rotating shaft of the eccentric wheel, and the outer ring of the bearing is transitionally fitted with the bearing outer ring mounting step of the bearing frame. A spherical hinge is provided at the second end of the linkage rod 111, and the spherical hinge includes a spherical head and a spherical sleeve. The spherical head is fixedly connected to the linkage rod 111, and the spherical sleeve is hinged to the swing rod 110. The spherical head can rotate in the spherical sleeve to achieve multi-directional rotation and ensure the stability of movement.

[0046] During actual operation, the motor 112 drives the eccentric wheel to rotate, and the eccentric wheel converts the rotational motion into reciprocating motion through the linkage rod 111. The reciprocating motion of the linkage rod 111 is transmitted to the swing rod 110 through the spherical hinge, so that the swing rod 110 swings back and forth. The swing rod 110 drives the entire filter membrane support to reciprocate in the cylindrical membrane pool 101 through a fixed connection with the filter membrane support rotating rod 109. This reciprocating rotation causes relative motion between the sewage filter membrane assembly 103 and the water, thereby enhancing the flushing effect of the water flow on the surface of the sewage filter membrane assembly 103, which is beneficial to prevent membrane pollution.

[0047] The filtration device also includes a sewage discharge pipe, which is arranged at the lowest point of the conical bottom wall at the bottom of the cylindrical membrane pool 101, and a sewage discharge valve is arranged on the sewage discharge pipe. During the sewage discharge process, the sewage discharge valve is opened, and the sewage in the membrane pool is discharged through the sewage discharge pipe under the action of gravity, so that the sewage is removed in time.

[0048] The filter device of the present invention realizes effective cleaning of the sewage filter membrane assembly 103 by providing a driving device to drive the filter membrane support to reciprocate. Specifically, the motor 112 in the driving device converts the rotary motion into reciprocating motion through the eccentric wheel and the linkage rod 111, and drives the filter membrane support to reciprocate in the cylindrical membrane pool 101 through the swing rod 110. This reciprocating rotation generates relative motion between the sewage filter membrane assembly 103 and the water, thereby enhancing the flushing effect of the water flow on the surface of the sewage filter membrane assembly 103.

[0049] Specifically, the present invention uses a mechanical drive to reciprocate the filter membrane support, which can clean the membrane surface more evenly than the traditional bubble stirring method. Since the reciprocating rotation of the filter membrane support drives all sewage filter membrane components 103 to move synchronously, each sewage filter membrane component 103 can obtain the same water flow flushing effect, effectively avoiding the generation of cleaning dead corners. Especially in the area near the lower manifold, since the sewage filter membrane component 103 moves with the filter membrane support as a whole, the membrane surface of these areas can also be fully flushed by water flow, thereby solving the problem that some areas are difficult to be cleaned under the traditional bubble stirring method.

[0050] The present invention uses the motor 112 to drive the filter membrane support to rotate back and forth, which can significantly reduce the operating energy consumption of the equipment compared to the method of using a high-pressure fan to blow air. The power of the motor 112 is much smaller than that of the high-pressure fan, and the motor 112 only needs to drive the filter membrane support to do reciprocating motion to achieve the cleaning effect, without continuously blowing a large amount of bubbles into the entire membrane pool, thereby greatly reducing energy consumption.

[0051] Due to the different lengths of the connecting pipes, the hydraulic resistance of each sewage filtration membrane assembly 103 is different, resulting in uneven water production of the sewage filtration membrane assembly 103 at different positions, affecting the filtration efficiency.

[0052] In view of the above technical problems, one solution is to adopt a connecting pipe structure with a variable cross-section, and the inner diameter of each connecting pipe gradually changes from both ends to the middle to balance the hydraulic resistance. The connecting pipe includes a first end, a middle section and a second end, the first end is connected to the top water collecting pipe 105, and the second end is connected to the bottom water collecting pipe 104. For the connecting pipe between the upper and bottom water collecting pipes with a long connection position, the inner diameter of the middle section is larger than the inner diameter of the first end and the second end; for the connecting pipe between the upper and bottom water collecting pipes with a short connection position, the inner diameter of the middle section is smaller than the inner diameter of the first end and the second end. The inner diameters of the first end and the second end are equal, and the inner diameter of the middle section is proportional to the length of the connecting pipe.

[0053] A spiral drainage strip is provided on the inner wall of the connecting pipe, and the spiral drainage strip extends along the axial direction of the connecting pipe to optimize the water flow distribution. The spiral drainage strip is in the shape of a spiral protrusion, and the cross section of the spiral drainage strip is triangular. The pitch of the spiral drainage strip is different at different positions of the connecting pipe: at the first end and the second end, the pitch of the spiral drainage strip is equal; in the middle section, the pitch of the spiral drainage strip changes as the distance from the first end increases. For a longer connecting pipe, the pitch of its spiral drainage strip is relatively large; for a shorter connecting pipe, the pitch of its spiral drainage strip is relatively small. Through the variable cross-section structure of the connecting pipe and the variable pitch structure of the spiral drainage strip, the hydraulic resistance balance of the connecting pipes of different lengths is achieved, ensuring that the water production of each sewage filtration membrane assembly 103 is uniform.

[0054] Another solution is to set an annular water collector between the upper and bottom water collecting pipes for balanced hydraulic distribution. The annular water collector is in the shape of a circular ring, and the axis of the annular water collector coincides with the axis of the upper and bottom water collecting pipes. The annular water collector includes an annular body and a plurality of connectors, the cross section of the annular body is rectangular, and the connectors are arranged on the outer peripheral surface of the annular body. The connectors are evenly distributed along the circumference of the annular body, and each connector includes an upper connecting pipe and a lower connecting pipe. The upper connecting pipe is connected to the top water collecting pipe 105, and the lower connecting pipe is connected to the bottom water collecting pipe 104, forming multiple groups of upper and lower short connecting pipes.

[0055] One end of the upper connecting pipe is connected to the annular body, and the other end is provided with an upper flange, which is fixedly connected to the corresponding flange on the top water collecting pipe 105. One end of the lower connecting pipe is connected to the annular body, and the other end is provided with a lower flange, which is fixedly connected to the corresponding flange on the bottom water collecting pipe 104. The axes of the upper connecting pipe and the lower connecting pipe are located in the same radial plane. The lengths of the upper connecting pipe and the lower connecting pipe are equal, and the inner diameters of the upper connecting pipe and the lower connecting pipe are equal to ensure the symmetry of the flow channel.

[0056] A plurality of guide baffles are arranged in the annular body of the annular water collector, and the guide baffles are arranged along the circumference of the annular body to separate the flow channels. An independent cavity is formed between adjacent guide baffles, and each cavity corresponds to a set of upper and lower connecting pipes. The guide baffle is fan-shaped, and the inner edge of the guide baffle is fixedly connected to the inner wall of the annular body, and the outer edge is fixedly connected to the outer wall of the annular body. The upper edge of the guide baffle is fixedly connected to the upper wall of the annular body, and the lower edge is fixedly connected to the lower wall of the annular body.

[0057] Each cavity includes an inlet area and an outlet area. The inlet area is connected to the upper connecting pipe, and the outlet area is connected to the lower connecting pipe. A water guide plate is arranged between the inlet area and the outlet area. The water guide plate is arc-shaped, and the two ends of the water guide plate are respectively fixedly connected to the adjacent flow guide baffles. The water guide plate divides the cavity into two areas, upper and lower. The volume of the upper area is larger than that of the lower area. A plurality of water guide holes are arranged on the water guide plate, and the water guide holes are evenly distributed along the circumference of the water guide plate to adjust the water flow distribution.

[0058] For the communication path between the upper and bottom water collecting pipes whose connection positions are far apart, the volume of the corresponding cavity is relatively large; for the communication path between the upper and bottom water collecting pipes whose connection positions are close, the volume of the corresponding cavity is relatively small. Specifically, the volume of the cavity is proportional to the length of the original communication pipe corresponding to its position, so as to achieve hydraulic balance.

[0059] A first flow guide assembly is provided in the water inlet area of ​​each cavity, and the first flow guide assembly includes a plurality of radial flow guide plates, which are evenly arranged along the circumference of the water inlet area. The inner ends of the radial flow guide plates are fixedly connected to the inner wall of the annular body, and the outer ends are fixedly connected to the water guide plate. A flow channel is formed between adjacent radial flow guide plates, and the cross-sectional area of ​​the flow channel gradually increases from the connection point of the upper connecting pipe to the water guide plate, thereby optimizing the distribution of the water inlet flow field.

[0060] A second flow guide assembly is provided in the water outlet area of ​​each cavity, and the second flow guide assembly includes a plurality of annular flow guide plates, which are arranged radially along the water outlet area. The two ends of the annular flow guide plates are respectively fixedly connected to the adjacent flow guide baffles. A drainage channel is formed between adjacent annular flow guide plates, and the cross-sectional area of ​​the drainage channel gradually decreases from the water guide plate to the connection point of the lower connecting pipe to ensure uniform water outlet.

[0061] By setting up the annular water collector, the original long connecting pipe is divided into two shorter connecting pipes, the difference in the length of the connecting pipe is significantly reduced. By designing different volumes of each cavity and setting up water guide plates and flow guide components in the cavity, the hydraulic characteristics of different connecting paths are balanced, effectively improving the problem of uneven water flow distribution.

[0062] When the filter membrane support rotates at high speed, the filter membrane support becomes unbalanced and vibrates due to the uneven distribution of the accumulated sludge in the sewage filter membrane assembly 103. This vibration may affect the service life of the equipment and may cause the connection to loosen or the seal to fail, so it is necessary to eliminate the vibration through a balancing assembly and a buffer assembly.

[0063] In view of the above technical problems, the solution is: an active buffer device is arranged on the rotating rod 109 of the membrane support, and the active buffer device includes a plurality of electromagnet assemblies, a vibration sensor and a controller for actively suppressing vibration. The plurality of electromagnet assemblies are evenly arranged along the circumference of the rotating rod 109, and the angles between adjacent electromagnet assemblies are equal. Each electromagnet assembly includes a support platform, an electromagnet core and an adjustment assembly. The support platform is fixed on the inner wall of the cylindrical membrane pool 101, and the support platform is L-shaped. The electromagnet core is fixed on the support platform, and the electromagnet core includes an iron core and a coil. The iron core is E-shaped, and the coil is wound on the middle protrusion of the iron core. The adjustment assembly includes a sliding block and a guide rail, the guide rail is fixed on the support platform, the sliding block is slidably connected to the guide rail, and the electromagnet core is fixed on the sliding block.

[0064] The vibration sensor includes a plurality of vibration sensors, which are evenly arranged along the circumference of the rotating rod 109, and each vibration sensor corresponds to an electromagnet assembly for detecting vibration signals. The vibration sensor is fixed to the inner wall of the cylindrical membrane pool 101 through a fixing seat, and the sensing end of the vibration sensor faces the rotating rod 109. The controller is arranged outside the cylindrical membrane pool 101, and the controller is electrically connected to each vibration sensor through a signal line, and is electrically connected to the coil of each electromagnet assembly through a power line.

[0065] A preset gap is left between the magnetic pole surface of each electromagnet core and the rotating rod 109, and the gap is adjusted by adjusting the position of the sliding block of the assembly on the guide rail. The controller receives the vibration signal collected by each vibration sensor, and controls the current of the coil of each electromagnet assembly according to the vibration signal, thereby adjusting the magnitude of the electromagnetic force generated by each electromagnet, and realizing active suppression of the vibration of the rotating rod 109.

[0066] When the filter membrane holder rotates, vibration will be generated, which will reduce the stability of the equipment and affect the filtering effect.

[0067] To solve this problem, a balancing component and a buffer component are added to the rotation system of the filter membrane support to reduce vibration.

[0068] The balancing assembly includes an adjustment frame and a balancing block for adjusting the weight distribution. The adjustment frame is rectangular and is fixed to the upper surface of the support rod 102 by bolts. A sliding groove is provided on the upper surface of the adjustment frame, and the sliding groove extends along the length direction of the support rod 102. Threaded holes are provided on the two side walls of the sliding groove. The balancing block is in the shape of a rectangular parallelepiped, and a sliding block matching the sliding groove is provided at the bottom of the balancing block, and the sliding block is installed in the sliding groove by sliding fit. Through holes are provided on both sides of the balancing block, and the fastening bolts pass through the through holes and are connected to the threaded holes on both sides of the sliding groove to fix the balancing block at a specified position in the sliding groove. An adjustment frame and a balancing block are provided on each support rod 102, and the weight distribution of each part of the membrane support is even by adjusting the position of each balancing block in the sliding groove.

[0069] The buffer assembly is arranged between the rotating rod 109 and the supporting bearing for absorbing vibration. The buffer assembly includes an inner sleeve, an outer sleeve and a plurality of buffer components. The inner sleeve is cylindrical, and is fixed to the rotating rod 109 by interference fit, and a plurality of mounting bosses are arranged on the outer surface of the inner sleeve. The outer sleeve is also cylindrical, and is fixed to the inner ring of the supporting bearing by interference fit, and a plurality of mounting bosses are arranged on the inner surface of the outer sleeve. The inner sleeve is coaxially arranged with the outer sleeve, and an annular space is formed between the inner sleeve and the outer sleeve. The buffer components are evenly arranged along the circumference of the annular space.

[0070] Each buffer component includes an elastic sheet and a blocking block. The elastic sheet is arc-shaped, and the inner end of the elastic sheet is fixedly connected to the mounting boss of the inner sleeve by bolts, and the outer end of the elastic sheet is fixedly connected to the mounting boss of the outer sleeve by bolts. The blocking block is rectangular, and the blocking blocks are respectively fixed to the upper and lower sides of the elastic sheet by bolts, and a gap is left between the blocking block and the elastic sheet. When the rotating rod 109 rotates, the buffer component absorbs the vibration generated during the rotation process to improve the operating stability.

[0071] During long-term operation, gas will accumulate in the top water collecting pipe 105, and the gas will occupy the space in the top water collecting pipe 105, resulting in a decrease in water production efficiency.

[0072] To solve this problem, an exhaust assembly is provided at the top of the top water collecting pipe 105. The exhaust assembly includes an exhaust shell, a float assembly and an exhaust device, which is used to automatically discharge the accumulated gas. The exhaust shell is cylindrical, and the bottom of the exhaust shell is connected to the top of the top water collecting pipe 105 through a flange. A vertical guide cylinder is provided in the exhaust shell, the bottom end of the guide cylinder is fixedly connected to the bottom wall of the exhaust shell, and the top end of the guide cylinder is fixedly connected to the top wall of the exhaust shell. A float assembly is provided in the guide cylinder.

[0073] The float assembly includes a float body and a plugging head, which are used to control exhaust. The float body is in the shape of a hollow cylinder, and a through hole is provided in the center of the float body, and the through hole is interference fit with the guide tube. The float body can slide vertically along the guide tube. The plugging head is in the shape of a cone, and the plugging head is fixed to the top of the float body by a threaded connection. A sealing body is provided at the top of the guide tube, and the sealing body is annular and fixed to the top of the guide tube. An air hole is provided in the center of the sealing body, and the air hole is connected to the inner cavity of the guide tube. When the float body rises, the conical surface of the plugging head fits with the conical surface of the sealing body, closing the air hole; when the float body descends, the conical surface of the plugging head separates from the conical surface of the sealing body, opening the air hole, and realizing automatic exhaust.

[0074] The exhaust equipment includes a vacuum pump and a gas relief pipe, which are used to extract the accumulated gas. The gas relief pipe is L-shaped, and the bottom end of the vertical section of the gas relief pipe is connected to the gas outlet at the top of the exhaust shell through a flange, and the end of the horizontal section of the gas relief pipe is connected to the gas inlet of the vacuum pump through a flange. The vacuum pump is fixed on the bracket, and the gas outlet of the vacuum pump is connected to the atmosphere through a pipe. A stop valve is provided on the gas relief pipe to control the on and off of the gas relief pipe.

[0075] When gas accumulates in the top water collecting pipe 105, the gas enters the exhaust shell, causing the float body to drop, the plugging head to separate from the sealing body, and the air hole to open. The vacuum pump works to extract the gas in the exhaust shell through the exhaust pipe. When the gas is discharged, the float body rises, the plugging head fits with the sealing body, and the air hole is closed, realizing the automatic exhaust process.

[0076] During the backwash process, the pressure of the backwash water will fluctuate, which will affect the backwash effect and reduce the cleaning efficiency.

[0077] To solve this problem, a pressure stabilizing device is provided between the backwash pump and the second water outlet pipe to stabilize the backwash water pressure.

[0078] The pressure stabilization device includes a pressure stabilizing tank body and a pressure regulating component. The pressure stabilizing tank body is cylindrical, and covers are respectively provided on the top and bottom of the pressure stabilizing tank body, which are fixedly connected to the pressure stabilizing tank body by bolts to form a sealing structure. An elastic diaphragm is provided inside the pressure stabilizing tank body, and the edge of the elastic diaphragm is fixed to the inner wall of the pressure stabilizing tank body by a buckle ring. The diaphragm divides the inner cavity of the pressure stabilizing tank body into a top cavity and a bottom cavity. Compressed air is filled in the top cavity, and the bottom cavity is connected to the backwash water pipeline through a pipe, and the backwash water pressure is stabilized by the buffering effect of compressed air.

[0079] The pressure regulating assembly includes a first control valve arranged at the water inlet of the pressure stabilizing tank body and a second control valve arranged at the water outlet of the pressure stabilizing tank body, which are used to adjust the water inlet and outlet. The water inlet is arranged at the lower side wall of the pressure stabilizing tank body, and the water outlet is arranged at the bottom of the pressure stabilizing tank body. The first control valve and the second control valve are connected to the water inlet and the water outlet through flanges. The first control valve and the second control valve are electrically connected to the controller through signal lines respectively. The controller is arranged in a control box outside the pressure stabilizing tank body, and the controller controls the opening and closing of the two control valves according to the detection signal of the pressure sensor in the backwash water pipeline to realize automatic pressure regulation.

[0080] The top cavity of the pressure-stabilizing tank is equipped with a pressure monitoring component and a pressure relief component for monitoring and adjusting the pressure. The pressure monitoring component is set on the top cover of the pressure-stabilizing tank. The pressure monitoring component includes a pressure gauge and a pressure transmitter. The pressure gauge is used to display the compressed air pressure in the top cavity on site, and the pressure transmitter transmits the pressure signal to the controller. The pressure relief component is set on the upper side wall of the pressure-stabilizing tank. The pressure relief component includes a pressure relief valve and a pressure relief pipeline. The pressure relief valve opens when the pressure exceeds the preset value, so that the compressed air in the top cavity is discharged through the pressure relief pipeline to ensure the safety of the system.

[0081] The bottom cavity of the pressure stabilizing tank is provided with a sewage discharge assembly for removing dirt from the system. The sewage discharge assembly includes a sewage discharge pipe and a sewage discharge valve. One end of the sewage discharge pipe is connected to the sewage discharge port at the bottom of the bottom cavity through a flange, and the other end is connected to the sewage discharge valve through a flange. The sewage discharge pipe is arranged vertically, and the sewage discharge valve is arranged at the end of the sewage discharge pipe. A filter screen is arranged at the sewage discharge port to prevent large particles of impurities from entering the sewage discharge pipe.

[0082] When the backwash water pressure increases, the backwash water enters the bottom cavity through the first control valve, pushing the elastic diaphragm upward and compressing the compressed air in the top cavity. When the backwash water pressure decreases, the compressed air in the top cavity pushes the elastic diaphragm downward, pushing the backwash water in the bottom cavity back to the backwash water pipeline through the second control valve, thereby keeping the water pressure in the backwash water pipeline stable.

[0083] The filtering device of the present application achieves a balance of the hydraulic resistance of the sewage filtration membrane components at different positions by setting an annular water collector between the top water collecting pipe and the bottom water collecting pipe. Specifically, the setting of the annular water collector divides the original long connecting pipe into two shorter connecting pipes, the upper and lower connecting pipes, which significantly reduces the difference in the length of the connecting pipes. Since the length and inner diameter of the upper connecting pipe and the lower connecting pipe are equal, the resistance encountered by the water flow in these connecting pipes is basically the same, thereby reducing the difference in hydraulic resistance caused by the difference in the length of the connecting pipes. At the same time, by setting a guide baffle in the annular body of the annular water collector to form an independent cavity, and through the differentiated design of the cavity volume and the synergistic effect of the water guide plate and the guide assembly, the balance of the hydraulic characteristics of different connecting paths is achieved, ensuring that each sewage filtration membrane component obtains a similar water production, which is beneficial to providing sewage treatment and water resource recycling effects.

[0084] The embodiments of the present application are described in detail above, and the contents of this specification should not be construed as limiting the scope of protection of the present application.

Claims

1. A filtering device, characterized in that: include: cylindrical membrane pool; A filter membrane support disposed in the cylindrical membrane pool, wherein the filter membrane support comprises a plurality of sewage filter membrane assemblies uniformly disposed along the circumference of the filter membrane support; A bottom water collecting pipe, the bottom water collecting pipe is annular, a plurality of water collecting interfaces are evenly arranged along the circumference of the bottom water collecting pipe, the water collecting interfaces are cylindrical, an annular protrusion is arranged on the outer wall of the water collecting interface, an annular groove is arranged on the end surface of the water collecting interface, and a sealing gasket is embedded in the annular groove; A top water collecting pipe, the top water collecting pipe is annular, and a plurality of water collecting interfaces are evenly arranged along the circumference of the top water collecting pipe, and the number of the water collecting interfaces of the top water collecting pipe is the same as the number of the water collecting interfaces of the bottom water collecting pipe; as well as An annular water collector, the annular water collector is arranged between the top water collecting pipe and the bottom water collecting pipe, the annular water collector comprises an annular body and a plurality of connecting pieces, the connecting pieces are arranged on the outer circumferential surface of the annular body, the connecting pieces comprise an upper connecting pipe and a lower connecting pipe, the upper connecting pipe is connected to the water collecting interface of the top water collecting pipe, the lower connecting pipe is connected to the water collecting interface of the bottom water collecting pipe, a plurality of guide baffles are arranged in the annular body, and independent cavities are formed between adjacent guide baffles; The guide baffle is arranged along the circumference of the annular body, the guide baffle is fan-shaped, the inner edge of the guide baffle is fixedly connected to the inner wall of the annular body, and the outer edge of the guide baffle is fixedly connected to the outer wall of the annular body; Each of the cavities comprises a water inlet area and a water outlet area, the water inlet area is connected to the upper connecting pipe, the water outlet area is connected to the lower connecting pipe, a water guide plate is arranged between the water inlet area and the water outlet area, the water guide plate is arc-shaped, and both ends of the water guide plate are respectively fixedly connected to the adjacent guide baffles; A first flow guide component is arranged in the water inlet area of ​​each cavity, the first flow guide component includes a plurality of radial flow guide pieces, the radial flow guide pieces are evenly arranged along the circumference of the water inlet area, the inner ends of the radial flow guide pieces are fixedly connected to the inner wall of the annular body, the outer ends of the radial flow guide pieces are fixedly connected to the water guide plate, and a flow guide channel is formed between adjacent radial flow guide pieces, and the cross-sectional area of ​​the flow guide channel gradually increases from the connection point of the upper connecting pipe to the water guide plate; A second guide component is arranged in the water outlet area of ​​each cavity, and the second guide component includes a plurality of annular guide plates, which are arranged radially along the water outlet area, and the two ends of the annular guide plates are respectively fixedly connected to the adjacent guide baffles, and a drainage channel is formed between the adjacent annular guide plates, and the cross-sectional area of ​​the drainage channel gradually decreases from the water guide plate to the connection point of the lower connecting pipe.

2. The filtering device according to claim 1, characterized in that: The annular water collector is in a circular ring shape, the axis of the annular water collector coincides with the axes of the top water collecting pipe and the bottom water collecting pipe, the cross section of the annular body is rectangular, and the connecting parts are evenly distributed along the circumference of the annular body.

3. The filtering device according to claim 1, characterized in that: The axes of the upper communicating tube and the lower communicating tube are located in the same radial plane, the lengths of the upper communicating tube and the lower communicating tube are equal, and the inner diameters of the upper communicating tube and the lower communicating tube are equal.

4. The filtering device according to claim 1, characterized in that: The water guide plate divides the cavity into an upper area and a lower area, the volume of the upper area is greater than the volume of the lower area, and a plurality of water guide holes are arranged on the water guide plate, and the water guide holes are evenly distributed along the circumference of the water guide plate.

5. The filtering device according to claim 1, characterized in that: The curvature of the water guide plate is the same as the curvature of the inner wall of the annular body, and the thickness of the water guide plate gradually decreases from the middle to both ends.

6. The filtering device according to claim 1, characterized in that: A plurality of reinforcing ribs are arranged on the outer circumferential surface of the annular body. The reinforcing ribs extend along the axial direction of the annular body, and the cross section of the reinforcing ribs is T-shaped.

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