An ultrafiltration device

Abstract

The application provides an ultrafiltration device, which comprises a shell, an inner cavity of which forms a water inlet cavity, a filter cavity, a water outlet cavity, an inner cylinder and a filter core which are arranged in the filter cavity; the filter core is rotatable, the hollow shaft inside the filter core is hollow and penetrates axially, the lower shaft end is connected with a drain pipe in the water outlet cavity, the drain pipe is a three-way pipe, has a liquid outlet pipe and a backwashing pipe, the hollow filaments of the filter core are densely arranged between the hollow shaft and the inner cylinder, and the two ends of each hollow filament are communicated with the water inlet cavity through flow guide ports; the inner cylinder is composed of at least two single half cylinders which are arranged in a central symmetry, each single half cylinder can be folded along the radial direction to wrap the filter core or be separated from each other to open, and is used for cooperating with backwashing of the filter core; the inner cavity of the inner cylinder in the closed state is communicated with the filter cavity through a liquid inlet hole in the top of the side wall. The application eliminates the complicated operation of taking out the filter core for cleaning, can realize direct cleaning of the filter core in the shell, and facilitates switching of the ultrafiltration state and the backwashing state of the device.

Description

TECHNICAL FIELD

[0001] The present application relates to sewage treatment technical field, more particularly to a kind of ultrafiltration device. BACKGROUND

[0002] Ultrafiltration is a kind of water purification mode in sewage treatment, i.e. water solution is under the impetus of pressure, flows through membrane surface, solvent (water) and small molecule solute smaller than membrane hole are permeated membrane, become purified liquid, and solute and solute group larger than membrane hole are intercepted, to realize the effect of purifying water.

[0003] At present, ultrafiltration mode is divided into external pressure type and internal pressure type, wherein external pressure type is that sewage enters into ultrafiltration assembly, and purified water is discharged through filter core into flow guide pipe in filter core, and the main part of filtration is hollow filament outside flow guide pipe in filter core, and a branch of ultrafiltration filter core is composed of hundreds to thousands of small hollow filaments, and the inner diameter of hollow filament is between 0.6-6mm, i.e. sewage is filtered through hollow filament, filtered water is collected and transmitted through hollow filament, and impurities are blocked outside hollow filament, so that with the accumulation of pollutants on the membrane surface of hollow filament, the membrane permeation pressure difference is increased.

[0004] At this time, it is necessary to backwash ultrafiltration membrane, and the backwash in prior art can reduce the membrane permeation pressure difference, but backwash cannot achieve ideal recovery effect, so it is necessary to manually take out ultrafiltration filter core with hollow filament to realize cleaning, which greatly affects the whole reclaimed water circulation, because cleaning filter core reduces the membrane permeation pressure difference, but the method has the following problems: filter core needs to be disassembled and assembled, and the number of filter core in the whole reclaimed water circulation system is large, so it causes great engineering quantity to clean filter core, and affects the normal use of reclaimed water circulation system in the process of cleaning or replacing filter core. SUMMARY

[0005] The present application solves the above technical problems, and therefore proposes an ultrafiltration device, which eliminates the cumbersome operation of taking out filter core first and then cleaning, can realize direct cleaning of filter core in shell, and the ultrafiltration state and backflushing state of the device are switched conveniently.

[0006] To achieve the above purpose, the present application adopts the following technical solutions:

[0007] An ultrafiltration device has the following structural characteristics:

[0008] The device comprises a shell, an inner cylinder composed of a plurality of movable single half cylinders, and a filter core arranged in the half cylinder.

[0009] The shell, the inner cavity is formed by the top end part upper transverse partition and the bottom end part lower transverse partition, and the inner cavity is divided into a water inlet cavity at the top, a filtering cavity in the middle, and a water outlet cavity at the bottom; the inner cylinder and the filter core are arranged in the filtering cavity; a spiral upward rotating flow guide groove is formed on the inner side wall of the shell corresponding to the height region of the filtering cavity; the side wall is provided with a liquid inlet and a sewage outlet which are connected to the lower end of the filtering cavity and the bottom respectively; liquid is introduced into the filtering cavity along the radial direction through the liquid inlet;

[0010] The filter core comprises a hollow shaft and a hollow wire, and the whole is driven to rotate around the central axis of the hollow shaft by a rotating device; the hollow shaft is internally hollow, and the two shaft ends are arranged between the upper transverse partition and the lower transverse partition through the upper mounting disc and the lower mounting disc and are axially through; the lower shaft end serves as a water outlet of the filter core and is connected to a drain pipe which is arranged in the water outlet cavity and extends to the outside of the device; the drain pipe is a three-way pipe, and two pipe openings exposed to the outside of the device serve as a liquid outlet and a backwashing pipe opening respectively; a vertical space is left between the hollow wire and the lower mounting disc; the hollow wire is densely arranged between the hollow shaft and the inner cylinder; each hollow wire is vertically hung, and the two ends are connected to the flow guide openings on the upper mounting disc and are communicated with the water inlet cavity above the upper mounting disc through the flow guide openings;

[0011] The inner cylinder is composed of at least two single-body half cylinders arranged in a central symmetry, and a radial space is left between the inner cylinder and the outer cylinder; the radial displacement connecting assembly is movably connected between the two adjacent single-body half cylinders; under the impact of the radial liquid flow of the self-liquid inlet pipe, each single-body half cylinder is pulled by the radial displacement connecting assembly, and can be in a closed state of being folded along the radial direction to wrap the filter core and cooperate with the ultrafiltration state of the filter core, or can be separated from each other by being unfolded along the radial direction to cooperate with the backwashing of the filter core; the inner cavity of the inner cylinder in the closed state is communicated with the filtering cavity through the liquid inlet hole in the top of the side wall.

[0012] The structure of the application also has the following characteristics:

[0013] The rotating device comprises a rotating motor and a rotating shaft; the rotating motor is externally arranged on the upper end of the shell; the motor shaft is coaxially connected with the rotating shaft; and the rotating shaft is coaxially connected with the upper mounting disc.

[0014] The rotating device comprises a fan wheel; the wheel shaft of the fan wheel is coaxially arranged between the top end of the water inlet cavity and the upper mounting disc; the upper end is rotationally connected with the top end of the water inlet cavity; and the lower end is coaxially connected with the upper mounting disc.

[0015] The radial displacement connecting assembly comprises a positioning rod, a sliding sleeve, connecting rods and a positioning sliding block, the upper end of the positioning rod is threadedly connected with an upper transverse partition plate, the sliding sleeve is vertically and slidably sleeved on the positioning rod, a pair of connecting rods are respectively connected with the top end portions of the two single half-cylinder side walls through a pair of connecting rods, the two ends of the connecting rods are respectively hingedly connected with the single half-cylinder and the sliding sleeve, the upper edge of the single half-cylinder is formed with the upwardly protruding positioning sliding block, the lower end of the upper transverse partition plate is formed with a radially arranged positioning sliding groove, and the positioning sliding block is slidably fitted in the positioning sliding groove and used for guiding the closing or separation of the single half-cylinder.

[0016] The inner side wall of the inner cylinder body is provided with radially outwardly protruding spiral flow protrusions which are integrally downwardly helical, and the spiral flow protrusions are in contact with the hollow filaments when the inner cylinder body is closed and wrapped around the filter core.

[0017] The shell is detachably assembled from top to bottom by an upper cover body, an outer cylinder body and a lower cover body, the upper transverse partition plate is arranged between the upper cover body and the inner cavity of the outer cylinder body, the lower transverse partition plate is arranged between the outer cylinder body and the inner cavity of the lower cover body, the upper transverse partition plate is correspondingly provided with a center mounting hole which is matched with the upper mounting disc, and the lower transverse partition plate is correspondingly provided with a center mounting hole which is matched with the lower mounting disc, and the upper and lower end faces of the whole are flush after assembly.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1、The present application divides the shell into an upper water inlet cavity, a middle filter cavity and a lower water outlet cavity, and internally arranges an inner cylinder body and a filter core in the filter cavity, so that each single half-cylinder constituting the inner cylinder body can be closed or separated along the radial direction, and the filter core can be rotated; corresponding to the ultrafiltration state of the device, the flow direction of sewage is the liquid inlet - the filter cavity - the liquid inlet hole - the inner cylinder body - the hollow filaments - the flow guide hole - the water inlet cavity - the hollow shaft inner cavity - the drain pipe - the liquid outlet pipe, and the inner cylinder body can be closed along the radial direction by the impact of water flow during the liquid inlet process of sewage to the filter cavity, so as to wrap the filter core, play the role of a traditional filter screen, and be conducive to the stability of the hollow filaments in the filtration state; corresponding to the backwashing state of the device, the flow direction of the backwashing liquid is the backwashing pipe - the drain pipe - the hollow shaft inner cavity - the water inlet cavity - the flow guide hole - the hollow filaments - the inner cylinder body - the filter cavity - the sewage outlet, and the "thrust" along the radial direction brought by the backwashing liquid causes the single half-cylinders of the inner cylinder body to separate from each other, so as to provide space for the rotation of the filter core, release the wrapping constraint on the hollow filaments, increase the effective contact area between the hollow filaments and the backwashing liquid, enable the hollow filaments to be more fully in contact with the backwashing liquid, easily remove the impurities attached to the surface of the hollow filaments, and be conducive to improving the backwashing effect; compared with the prior art, the filter core does not need to be taken out from the shell for cleaning, and the cumbersome disassembly and assembly process is avoided, so that the workload of cleaning the filter core is reduced.

[0020] 2. The filter cavity of the shell has a spiral flow guide groove on the inner wall, which produces upward spiral flow of the sewage entering the filter cavity. Firstly, it is easy to intercept the impurities in the sewage, realizing the preliminary filtration of the impurities, and using the centrifugal force in the spiral flow to make the lighter impurities away from the liquid inlet hole at the top end of the inner cylinder, effectively reducing the impurities entering the inner cylinder and reducing the degree of impurities adhering to the hollow silk. Secondly, the spiral flow forms a wrapping force to the inner cylinder, further strengthening the stability of the closed state of the inner cylinder.

[0021] 3. The inner cylinder has a spiral flow protrusion on the inner wall, which produces downward spiral flow in the inner cylinder. On the one hand, it can strengthen the extrusion force of the sewage on the hollow silk, and on the other hand, it can be used to drive the impurities on the surface of the hollow silk to move along the spiral flow to the lower part of the inner cylinder during the filtration process, so that the impurities gradually accumulate upward from the bottom of the inner cylinder. The impurities located at the bottom will be quickly washed away under the subsequent backwashing, which is easy to clean. Furthermore, when backwashing is performed, the inner cylinder is in a separated state, and when the filter core rotates, the hollow silk will contact the spiral flow protrusion under the action of centrifugal force. Through the contact between the two, the impurities on the surface of the hollow silk can be further removed, which is beneficial to the cleaning of the surface of the hollow silk. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the internal structure of the present application;

[0023] Figure 2 is a schematic diagram of the external structure of the present application;

[0024] Figure 3 is a schematic diagram of the structure of the filter core;

[0025] Figure 4 is a schematic diagram of the structure of the upper mounting disc;

[0026] Figure 5 is a schematic diagram of the structure of the single half cylinder;

[0027] Figure 6 is a schematic diagram of the structure of the inner cylinder in a separated state;

[0028] Figure 7 is a schematic diagram of the structure of the single half cylinder from another perspective;

[0029] Figure 8 is a schematic diagram of the structure of the fan wheel;

[0030] Figure 9 is a schematic diagram of the structure of the filter core with a filter screen.

[0031] In the drawings:

[0032] 1 housing; 11 upper transverse partition; 12 lower transverse partition; 13 water inlet cavity; 14 filter cavity; 15 water outlet cavity; 16 spiral flow guide channel; 17 liquid inlet; 18 sewage outlet; 19 sewage groove; 110 drain pipe; 111 liquid outlet; 112 backwashing pipe; 113 upper cover body; 114 outer cylinder body; 115 lower cover body;

[0033] 2 inner cylinder body; 21 single body half cylinder; 22 spiral flow protrusion; 23 positioning rod; 24 sliding sleeve; 25 connecting rod; 26 positioning sliding block; 27 hinged groove; 28 liquid inlet hole;

[0034] 3 filter core; 31 hollow shaft; 32 hollow wire; 33 upper mounting disc; 34 flow guide port; 35 lower mounting disc;

[0035] 41 rotating motor; 42 rotating shaft; 43 fan wheel;

[0036] 51 magnet block ring; 52 magnetic block; 53 annular sliding groove; 54 vertical sliding groove; 55 filter screen. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in a clear and complete manner in conjunction with the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] Please refer to Figures 1 to 8 The ultrafiltration device of the present embodiment comprises a housing 1, an inner cylinder body 2 composed of a plurality of movable single body half cylinders 21, and a filter core 3 arranged in the half cylinder body;

[0039] The housing 1 has an inner cavity which is divided into a top water inlet cavity 13, a middle cylindrical filter cavity 14, and a bottom water outlet cavity 15 by the upper transverse partition 11 at the top end and the lower transverse partition 12 at the bottom end. The inner cylinder body 2 and the filter core 3 are arranged in the filter cavity 14 in the middle. The inner side wall of the housing 1 forms a spiral upwardly arranged spiral flow guide channel 16 corresponding to the height region where the filter cavity 14 is located. The side wall is provided with a liquid inlet 17 and a sewage outlet 18 which are connected to the lower end of the filter cavity 14 and the bottom end respectively. A liquid inlet pipe connected to the liquid inlet 17 radially leads liquid into the filter cavity 14. The sewage outlet 18 is connected to a sewage groove 19 arranged at the upper end of the lower transverse partition 12. A sewage pipe is connected to the sewage groove 19. The impurities collected in the sewage groove 19 can be discharged outward through the sewage pipe via the sewage outlet 18. Control valves for controlling the opening and closing of the sewage pipe and the liquid inlet pipe are arranged on the two pipes. The control valves on the two pipes are kept in an open-close state.

[0040] The filter core 3 comprises a hollow shaft 31, hollow filaments 32, and is driven by rotating device to rotate around the central axis of the hollow shaft 31. The hollow shaft 31 is hollow inside, and the two shaft ends are arranged between the upper transverse partition plate 11 and the lower transverse partition plate 12 through the upper mounting disc 33 and the lower mounting disc 35, and are axially penetrated. The lower shaft end serves as the water outlet of the filter core 3, and is connected with the drain pipe 110 arranged in the center of the water outlet cavity 15 and extending to the outside of the device. In order to improve the sealing performance of the joint, a stepped hole for connecting with the drain pipe 110 is reserved in the middle of the lower transverse partition plate 12, and a sealing gasket is arranged at the joint. The drain pipe 110 is a three-way pipe, and two pipe openings exposed to the outside of the device are used as the liquid outlet opening 111 and the backwashing pipe opening 112, which are connected with the filter total output pipe and the backwashing liquid pipe respectively. Control valves for controlling the opening and closing of the two pipe openings are arranged at the liquid outlet opening 111 and the backwashing pipe opening 112. The control valves of the two pipe openings are kept in the state of one opening and one closing, so as to ensure that the ultrafiltration state and the backwashing state do not affect each other. The hollow filaments 32 are vertically spaced apart from the lower mounting disc 35, and are densely arranged between the hollow shaft 31 and the inner cylinder 2. The hollow filaments 32 are vertically hung, and the two ends are connected with the flow guide openings 34 on the upper mounting disc 33 and communicated with the water inlet cavity 13 above the upper mounting disc 33 through the flow guide openings 34. When the ultrafiltration device is in the ultrafiltration state, the water filtered by the hollow filaments 32 enters the water inlet cavity 13 through the flow guide openings 34, and then is delivered downward through the hollow cavity of the hollow shaft 31. When the ultrafiltration device is in the backwashing state, the liquid in the hollow cavity of the hollow shaft 31 enters the hollow filaments 32 through the water inlet cavity 13 and the flow guide openings 34, and then enters the inner cylinder 2 through the hollow filaments 32.

[0041] The inner cylinder 2 is composed of at least two single half cylinders 21 arranged in a central symmetry, and is radially spaced apart from the outer cylinder 114. The adjacent two single half cylinders 21 are movably connected by a radial displacement connecting assembly. Under the impact of the radial liquid flow of the self-liquid inlet pipe, each single half cylinder 21 is pulled by the radial displacement connecting assembly, so as to form the closed inner cylinder 2 along the radial direction, wrap the filter core 3, play the role of the traditional "filter screen 55", cooperate with the ultrafiltration state of the filter core 3, or separate from each other along the radial direction, release the wrapping of the hollow filaments 32, and cooperate with the backwashing of the filter core 3. The inner cavity of the closed inner cylinder 2 is communicated with the filter cavity 14 through the liquid inlet hole 28 at the top of the side wall.

[0042] When the device is used for ultrafiltration, sewage is discharged from the liquid inlet 17 into the filter cavity 14 along the radial direction, and impacts on the outer wall of the adjacent single half cylinder 21. Under the impact of the water flow, each single half cylinder 21 is closed along the radial direction under the traction of the radial displacement connection assembly, and the filter core 3 is wrapped inside, which is beneficial to the stability of the hollow wire 32 in the filtering state. The sewage entering the filter cavity 14 spreads upward under the action of the cyclone guide groove 16, and then enters the inner cylinder 2 through the liquid inlet hole 28, and is filtered through the filter core 3. The filtered sewage enters the water inlet cavity 13 through the flow guide hole 34, and is then downwardly conveyed through the inner cavity of the hollow shaft 31, and is discharged outside the device through the liquid outlet of the drain pipe 110.

[0043] When the device is used for backwashing, the liquid inlet 17 stops liquid inlet, and the single half cylinder 21 loses the impact of the liquid flow. Under the action of the gravity of the water body in the inner cylinder 2, and under the backwashing state, the backwashing liquid is supplied into the hollow shaft 31 through the backwashing pipe opening 112 of the drain pipe 110, enters the water inlet cavity 13, and then enters the inner cylinder 2 through the hollow wire 32 from the flow guide hole 34. From the inner cylinder 2, it flows outward, that is, it forms a "thrust" along the radial direction outwardly on the single half cylinder 21, so that each single half cylinder 21 moves along the radial direction outwardly, and is separated from each other, thereby providing space for the rotation of the filter core 3. In this state, the sewage outlet 18 is opened to keep unobstructed, and the water body is discharged outwardly through the sewage pipe. During the backwashing process, the rotation device is arranged to drive the filter core 3 to rotate, so that the filter core 3 can be more fully contacted with the backwashing liquid, and the backwashing effect is better.

[0044] By arranging the cyclone guide groove 16 in the filter cavity 14, the cyclone is generated: first, the wrapping force to the inner cylinder 2 is formed, so that in the filtering state of the filter core 3, in addition to the impact of the liquid inlet 17 on the single half cylinder 21, the cyclone is further used to strengthen the stability of the closed state of the inner cylinder 2; second, since the sewage flows upward along the gap between the inner cylinder 2 and the shell 1 in the filter cavity 14, the preliminary filtration of impurities in the sewage can be realized. The impurities with large mass will be deposited, and the impurities with light mass will be gathered at the top of the water body in the filter cavity 14. Under the action of the cyclone of the sewage, a centrifugal force outwardly is generated, and the part of the impurities in the water body will be outside the cyclone sewage, far away from the liquid inlet hole 28 of the inner cylinder 2. Therefore, the impurities entering the inner cylinder 2 can be effectively avoided, thereby reducing the accumulation of excess impurities on the surface of the filter core 3, and prolonging the service life of the filter core 3; third, since the sewage enters the inner cylinder 2 through the liquid inlet hole 28 in the form of cyclone, the impurities can be avoided to block the liquid inlet hole 28 to a certain extent.

[0045] In the specific implementation, the further structure of the device also includes:

[0046] The rotating device comprises a rotating motor 41 and a rotating shaft 42. The rotating motor 41 is externally arranged on the upper end of the shell 1, the motor shaft is coaxially connected with the rotating shaft 42, and the rotating shaft 42 is coaxially connected with the upper mounting disc 33. The lower end of the rotating shaft 42 is fitted into the annular groove of the upper mounting disc 33, and a gap is left between the rotating shaft 42 and the annular groove, so that the upper shaft end of the hollow shaft 31 and the water inlet cavity 13 are kept in communication, facilitating the circulation of backwashing liquid.

[0047] Another structure of the rotating device can be that a fan wheel 43 is coaxially arranged between the top end of the water inlet cavity 13 and the upper mounting disc 33, the upper end of the fan wheel 43 is rotationally connected with the top end of the water inlet cavity 13, and the lower end of the fan wheel 43 is coaxially connected with the upper mounting disc 33. Similarly, the lower end of the wheel shaft is fitted into the annular groove of the upper mounting disc 33, and a gap is left between the wheel shaft and the annular groove, so that the upper shaft end of the hollow shaft 31 and the water inlet cavity 13 are kept in communication, facilitating the circulation of backwashing liquid. The flow of backwashing liquid entering the water inlet cavity 13 from the hollow shaft 31 drives the fan wheel 43 to rotate, and further drives the filter element 3 to rotate.

[0048] The radial displacement connecting assembly comprises a positioning rod 23, a sliding sleeve 24, a connecting rod 25 and a positioning sliding block 26. The upper end of the positioning rod 23 is threadedly connected with the upper transverse partition plate 11. The sliding sleeve 24 is vertically and slidably sleeved on the positioning rod 23. A pair of connecting rods 25 are respectively connected with the side end portions of the two single half cylinders 21 through a pair of connecting rods 25. The connecting rod 25 is hingedly connected with the single half cylinder 21 and the sliding sleeve 24 at both ends thereof. The upper edge of the single half cylinder 21 is formed with the positioning sliding block 26 protruding upward. The lower end of the upper transverse partition plate 11 is formed with the positioning sliding groove arranged in the radial direction. The positioning sliding block 26 is slidably fitted in the positioning sliding groove, and is used for guiding the folding or separating of the single half cylinders 21. The single half cylinder 21 is correspondingly provided with the hinge groove 27 at the hinge connection position of the connecting rod 25, and the connecting rod 25 is hingedly connected with the single half cylinder 21 at the hinge groove 27.

[0049] When the inner cylinder body 2 is folded: the liquid flowing into the filter cavity 14 of the outer cylinder body 114 from the liquid inlet 17 impacts on the outer side wall of one of the single half cylinders 21, so that the impacted single half cylinder 21 moves radially towards the filter element 3, and through the hinged connection of the connecting rod 25 and the sliding sleeve 24 and the sliding connection of the sliding sleeve 24 and the positioning rod 23, the other single half cylinders 21 are displaced radially towards the filter element 3 under the traction of the radial displacement connecting assembly, until the inner cylinder body 2 is completely closed to wrap the filter element 3;

[0050] When the inner cylinder body 2 is separated: when the filter element 3 is in the backwashing state, the liquid inlet pipe stops feeding liquid, the single half cylinders 21 lose the impact of the liquid flow, and under the backwashing state, the backwashing liquid flows outwards from the inner cylinder body 2, that is, a "thrust" is formed on the single half cylinders 21 in the radial direction, so that the single half cylinders 21 move radially outward and separate from each other, providing space for the backwashing of the filter element 3, and facilitating the backwashing of the filter element 3.

[0051] The inner side wall of the inner cylinder 2 is provided with a radial outward convex spiral downward rotating flow protrusion 22 made of rubber material. When the inner cylinder 2 is folded and wrapped outside the filter core 3, the rotating flow protrusion 22 is in contact with the hollow silk 32.

[0052] By setting the rotating flow protrusion 22 on the inner side wall of the inner cylinder 2, a downward rotating flow is generated in the inner cylinder, which is used to strengthen the extrusion force of the sewage on the hollow silk 32. Secondly, it is used to drive the impurities on the surface of the hollow silk 32 to move along the rotating flow to the lower part of the inner cylinder 2 during the filtering process, so that the impurities gradually accumulate upward from the bottom of the inner cylinder 2. The impurities located at the bottom can be quickly washed away under the subsequent backwashing, which is easy to clean. Thirdly, when backwashing is performed, the inner cylinder 2 is in a separated state. When the filter core 3 rotates, the hollow silk 32 will contact the rotating flow protrusion 22 under the action of centrifugal force. Through the contact between the two, the impurities on the surface of the hollow silk 32 can be further removed, which is beneficial to the cleaning of the surface of the hollow silk 32.

[0053] The shell 1 is detachably assembled from top to bottom by the upper cover body 113, the outer cylinder body 114 and the lower cover body 115, and can be buckled or bolted. The upper transverse partition plate 11 is arranged between the upper cover body 113 and the inner cavity of the outer cylinder body 114, and the lower transverse partition plate 12 is arranged between the outer cylinder body 114 and the inner cavity of the lower cover body 115. Limiting grooves are arranged on the inner side wall of the shell 1 corresponding to the installation positions of the upper transverse partition plate 11 and the lower transverse partition plate 12, which are used for limiting when the upper transverse partition plate 11 and the lower transverse partition plate 12 are installed. Corresponding to the upper mounting disc 33 on the upper transverse partition plate 11 and the lower mounting disc 35 on the lower transverse partition plate 12, respectively, a center mounting hole matching the upper mounting disc 33 and the lower mounting disc 35 is reserved on the upper transverse partition plate 11 and the lower transverse partition plate 12. After assembly, the upper and lower end faces of the whole are flush, and gaps are left between the upper mounting disc 33 and the upper transverse partition plate 11 and between the lower mounting disc 35 and the lower transverse partition plate 12, so that the filter core 3 can rotate as a whole.

[0054] Referring to Figure 9 , the following is an optional example further extended on the basis of the above device for reference by those skilled in the art:

[0055] If the filter core 3 still adopts the filter screen 55, instead of directly replacing the traditional filter screen 55 with the "inner cylinder 2", more convenient and sufficient cleaning of the filter core 3 can also be achieved. Specifically, a magnet block ring 51 and a magnet group are arranged in the device, the filter screen 55 is made of flexible material, the upper end is fixed, the lower end is open, and the hollow silk 32 is wrapped inside.

[0056] The magnet block ring 51 is slidably arranged in the inner cavity of the hollow shaft 31 under the action of water flow impact; a set of magnet groups is arranged corresponding to each single half cylinder 21, and a pair of magnet blocks 52 of the magnet group are vertically attracted by magnetic force, and are clamped at the bottom end of the filter screen 55 in the initial state by the magnetic force therebetween, and the pair of magnet blocks 52 are horizontally attracted by magnetic force between the pair of magnet blocks 52 and the magnet block ring 51, and can vertically slide along the vertical sliding groove 54 on the inner side wall of the single half cylinder 21 by the magnetic force, the inner cylinder body 2 is provided with a ring-shaped sliding groove 53 at the top end of the side wall, and the vertical sliding groove 54 is provided with a plurality of vertical sliding grooves 54 in the circumferential direction, the ring-shaped sliding groove 53 intersects and communicates with each vertical sliding groove 54, and is arranged in a ring shape with the central axis of the inner cylinder body 2 as the center when the inner cylinder body 2 is in a separated state, and under the impact of backwashing liquid, the magnet block ring 51 at the upper end of the hollow shaft 31 slides upward to rely on the magnetic force between the pair of magnet blocks 52, and drives the pair of magnet blocks 52 to displace upward along the vertical sliding groove 54 to the ring-shaped sliding groove 53, so that the filter screen 55 is clamped at the bottom end by each magnet group, and the filter screen 55 is lifted upward to release the constraint of completely wrapping the hollow wire 32. With the rotation of the filter core 3, the pair of magnet blocks 52 can slide along the ring-shaped sliding groove 53 along the circumferential direction under the action of the magnetic force between the pair of magnet blocks 52 and the magnet block ring 51. The width of each magnet block 52 should be greater than the gap size between the adjacent two single half cylinders 21 in the separated state.

[0057] The inner cavity of the hollow shaft 31 is prismatic, and the magnet block ring 51 is also prismatic, which facilitates the rotation of the magnet block ring 51 together with the filter core 3, and a through hole is formed in the middle of the magnet block ring 51, which is composed of a cylindrical hole in the middle and a circular truncated cone hole symmetrically arranged above and below and connected with the cylindrical hole, and the small end of the circular truncated cone hole faces the cylindrical hole. In this way, no matter whether the water body passes through the magnet block ring 51 from top to bottom or from bottom to top, the circular truncated cone hole is first entered, the flow area is reduced to increase the water pressure, which is beneficial to the sliding of the magnet block ring 51 under the action of water pressure.

[0058] In the ultrafiltration state, the magnet block ring 51 is located at the bottom of the hollow shaft 31, and under the action of the attractive magnetic force, the pair of magnet blocks 52 of each magnet group is also located at the top of the vertical sliding groove 54, and is clamped at the bottom end of the filter screen 55;

[0059] When the device is in the backwashing state, the backwashing liquid flows upward along the inner cavity of the hollow shaft 31 from the bottom. Under the water pressure of the backwashing liquid, the magnet block ring 51 slides upward, and a pair of magnetic blocks 52 are driven to slide upward along the vertical sliding groove 54 by the magnetic force, until the magnet block ring 51 is displaced to the upper end of the hollow shaft 31, and the pair of magnetic blocks 52 are correspondingly moved into the annular sliding groove 53. At this time, the filter screen 55 is lifted up, and the complete wrapping and binding of the hollow wire 32 are released. With the rotation of the filter core 3, the hollow wire 32 is fully contacted with the backwashing liquid, which is conducive to the removal of impurities on the surface of the hollow wire 32. In the process, the magnet block ring 51 rotates with the hollow shaft 31, and the pair of magnetic blocks 52 slide along the annular sliding groove 53 under the magnetic force of the magnet block ring 51. After the backwashing is completed, the magnet block ring 51 descends, and the pair of magnetic blocks 52 slide downward along the vertical sliding groove 54, driving the filter screen 55 to return to the original state.

[0060] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An ultrafiltration device, characterized in that: It includes a shell, an inner cylinder composed of multiple movable single-unit semi-cylinders, and a filter element built into the semi-cylinders; The shell has an inner cavity divided by an upper horizontal partition at the top and a lower horizontal partition at the bottom, forming a water inlet cavity at the top, a columnar filter cavity in the middle, and a water outlet cavity at the bottom. The inner cylinder and filter element are built into the filter cavity and are centrally located. Corresponding to the height area of ​​the filter cavity, the inner sidewall of the shell forms a spiral upward swirling guide groove. The sidewall has liquid inlet and drain outlet that are respectively connected to the lower end and bottom end of the filter cavity. Liquid enters the filter cavity radially through the liquid inlet. The filter element includes a hollow shaft and hollow wires. The whole is driven by a rotating device to rotate around the central axis of the hollow shaft. The hollow shaft is hollow inside. The two shaft ends are respectively set between the upper and lower horizontal partitions through the upper and lower mounting plates, and are axially connected. The lower shaft end serves as the water outlet of the filter element and is connected to a drain pipe that is centrally located in the water outlet chamber and extends to the outside of the device. The drain pipe is a three-way pipe with two ports exposed outside the device, one of which serves as the liquid outlet and the other as the backwash outlet. There is a vertical gap between the hollow wires and the lower mounting plate. The hollow wires are densely distributed between the hollow shaft and the inner cylinder. Each hollow wire hangs down and its two ends are respectively connected to the guide port on the upper mounting plate and communicate with the water inlet chamber above the upper mounting plate through the guide port. The inner cylinder is composed of at least two centrally symmetrically arranged single-unit semi-cylinders, with a radial gap between them and the outer cylinder. Adjacent single-unit semi-cylinders are movably connected by a radial displacement connecting assembly. Relying on the impact of the radially flowing liquid from the inlet pipe, each single-unit semi-cylinder is pulled by the radial displacement connecting assembly, and can either close radially to form a closed inner cylinder to enclose the filter element for ultrafiltration, or open radially to separate from each other for backwashing the filter element. The inner cavity of the closed inner cylinder is connected to the filtration chamber through the liquid inlet hole at the top of the side wall.

2. The ultrafiltration device according to claim 1, characterized in that: The rotating device includes a rotating motor and a rotating shaft. The rotating motor is externally mounted on the upper end of the housing, and the motor shaft is coaxially connected to the rotating shaft. The rotating shaft is coaxially connected to the upper mounting plate.

3. The ultrafiltration device according to claim 1, characterized in that: The rotating device includes a fan impeller, the fan impeller's shaft being coaxially disposed between the top of the water inlet chamber and the upper mounting plate, the upper end being rotatably connected to the top of the water inlet chamber, and the lower end being coaxially connected to the upper mounting plate.

4. The ultrafiltration device according to claim 1, characterized in that: The radial displacement connection assembly includes a positioning rod, a sliding sleeve, a connecting rod, and a positioning slider. The upper end of the positioning rod is threadedly connected to the upper transverse partition. The sliding sleeve is vertically and slidably fitted onto the positioning rod. It is connected to the top edge of the side of the individual half-cylinders on both sides by a pair of connecting rods. The two ends of the connecting rods are respectively hinged to the individual half-cylinders and the sliding sleeve. The positioning slider is formed with an upward protruding part on the upper edge of the individual half-cylinder. The lower end of the upper transverse partition has a radially arranged positioning groove. The positioning slider is slidably fitted in the positioning groove for guiding the individual half-cylinders when they are joined or separated.

5. The ultrafiltration device according to claim 1, characterized in that: The inner wall of the inner cylinder is provided with a radially outward convex and integrally spiral downward swirling protrusion. When the inner cylinder is closed and wrapped around the filter element, the swirling protrusion comes into contact with the hollow filament.

6. The ultrafiltration device according to claim 1, characterized in that: The shell is detachably assembled from an upper cover, an outer cylinder, and a lower cover from top to bottom. An upper horizontal partition is set between the upper cover and the inner cavity of the outer cylinder, and a lower horizontal partition is set between the outer cylinder and the inner cavity of the lower cover. The upper horizontal partition corresponds to the upper mounting plate, and the lower horizontal partition corresponds to the lower mounting plate. Corresponding center mounting holes are reserved on each of them. After assembly, the upper and lower end faces of the whole are flush.

Images