Combined microfilter

Abstract

The utility model provides a combined microfilter, which relates to the technical field of water treatment, and is formed by combining a plurality of different structural members from top to bottom through the combination of modularized filter components, the specific combination can be freely changed according to the requirements, and as the plurality of filter components are stacked by adopting a sealing boss and a sealing groove, the combined microfilter has the advantages of simple structure and low cost. According to the present invention, capital construction, cast-in-place and maintenance period are not required, the installation can be completed only through hoisting, such that a large amount of time cost and labor cost are saved, and the backwashing in the first filtration assembly is performed in regions one by one so as to produce mechanical friction between the static filtration material and the rising filtration material so as to easily achieve the pollutant shedding, such that the filtration efficiency is improved. Compared with integral simultaneous backwashing, the energy-saving filter tank has an energy-saving effect, is better in backwashing effect, and relieves the technical problems that a traditional filter tank is large in occupied space, difficult to construct, high in cost and not in place in backwashing in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field especially is related to a combined microfiltration tank. BACKGROUND

[0002] In the field of water treatment, filter tank is a widely used facility, especially in large facilities, cement on-site pouring method is often used. However, this method has some significant problems:

[0003] 1. When carrying out cement on-site pouring, a piece of land larger than the filter tank area must be prepared for stacking steel bar materials, formwork materials and equipment facilities required for pouring cement, which is usually called a stockyard. The existence of the stockyard not only occupies additional land resources, but also means that additional costs need to be paid.

[0004] 2. Cement on-site pouring needs a large amount of labor to bundle steel bars, and a large number of manual labor is also needed to set up and remove the formwork. These operations not only take time, but also have high labor intensity, which increases the labor cost.

[0005] 3. Different sizes of filter tanks need to be redesigned each time, which not only consumes design resources, but also further increases labor costs. Each design and construction needs to consider size, material and construction method again, which undoubtedly increases the complexity and cost of the project.

[0006] 4. Cement tank trucks are needed to continuously transport cement slurry from the mixing station during construction, which not only occupies road resources, but also generates additional costs, including labor costs, vehicle equipment costs and oil costs. In addition, the cost of manual auxiliary pouring also needs to be paid, further increasing the construction cost.

[0007] 5. After the construction is completed, a large amount of time and labor is needed for on-site cleaning and transporting the excess construction materials, which is also a time-consuming and labor-intensive work, increasing the total cost of the project.

[0008] 6. The on-site poured cement tank needs a relatively complete land, which is difficult to use for corner or winding sites, limiting the flexibility and application range of construction.

[0009] 7. The traditional filter tank is limited by the backwashing method and structure, which also restricts the height of the filter layer. The widely used filter layer height is generally 0.5-0.7 meters for quartz sand height of effective filter layer besides the height of goose egg stone as filler. Even so, there are still problems such as incomplete backwashing, filter material compaction, incomplete backwashing leading to gradually decreased flow, etc. These problems further affect the filtration effect.

[0010] In summary, the traditional filter tank occupies a large space, is difficult to build, has high cost, and the backwashing is not in place. Utility model content

[0011] The utility model discloses a combined microfiltration tank to alleviate the technical problem of the traditional filter tank in prior art, which has the problems of large space occupation, difficult construction, high cost and poor backwashing.

[0012] The combined microfiltration tank provided by the utility model comprises a filter unit; the filter unit comprises a plurality of filter assemblies which are sequentially stacked from bottom to top, and any two adjacent filter assemblies are connected through a sealing groove and a sealing boss; the plurality of filter assemblies comprise a first filter assembly, a second filter assembly, a third filter assembly, a fourth filter assembly and a fifth filter assembly; the first filter assembly is provided with a plurality of division areas, and the first filter assembly is configured to be capable of backwashing the division areas one by one, so that mechanical friction is generated between the static filter material and the rising filter material; the inner wall of the second filter assembly is in a zigzag shape; the third filter assembly is used for controlling the direction of water inflow; the fourth filter assembly is used for providing a filter layer backwashing expansion space; and the fifth filter assembly is provided with an overflow groove which is used for collecting backwashing sewage.

[0013] In an optional embodiment, the first filter assembly comprises a first filter main body; a region partition is arranged in the first filter main body, and the region partition is used for forming a plurality of division areas in the internal space of the first filter main body; and a first water outlet pipe is arranged in each division area; and the first filter main body is provided with a first hoisting connection flange and a first water outlet flange.

[0014] In an optional embodiment, the inner wall of the first filter main body has a stepped surface, a pre-buried bolt is arranged on the stepped surface, and the pre-buried bolt sequentially penetrates a flat steel, a lower steel plate, a filter screen, an upper steel plate and a nut from bottom to top; a vertical plate is arranged in the first filter main body, and the vertical plate is used for pressing the filter screen; and a connecting plate is arranged in the first filter main body, and the connecting plate is used for supporting the flat steel.

[0015] In an optional embodiment, the second filter assembly comprises a second filter main body; the second filter main body is provided with a second hoisting connection flange; the inner wall of the second filter main body is in a zigzag shape, and filter material is stored in the second filter main body.

[0016] In an optional embodiment, the third filter assembly comprises a third filter main body; the third filter main body is provided with a third hoisting connection flange; a third flow guide ring is arranged in the third filter main body, and the third flow guide ring is used for making the water flow in the third filter main body move in a rotating and upward manner.

[0017] In an optional embodiment, the third filter body is provided with a water inlet guide opening for the water inlet pipe to pass through; and the third filter body is provided with a third blowdown opening.

[0018] In an optional embodiment, the fourth filter assembly comprises a fourth filter body; the fourth filter body is provided with a fourth hoisting connection flange; and the fourth filter body is provided with a fourth flow guide ring.

[0019] In an optional embodiment, the fifth filter assembly comprises a fifth filter body; the fifth filter body is provided with a fifth hoisting connection flange; and the inner wall of the fifth filter body is inwardly extended and bent to form the overflow groove, and the liquid in the overflow groove is led out through the blowdown pipe.

[0020] In an optional embodiment, the combined microfiltration tank further comprises a sedimentation structure; and the fifth filter body is provided with a plurality of embedded steel plates for supporting the sedimentation structure in the fifth filter body.

[0021] In an optional embodiment, the sedimentation structure comprises a sludge collection pipe, a sedimentation cone, a plurality of porous plates and a wire bolt; the bottom of the sedimentation cone is communicated with the sludge collection pipe; the top of the sedimentation cone is provided with a cone upper edge, the cone upper edge is connected with the wire bolt, and the wire bolt passes through the plurality of porous plates.

[0022] The combined microfiltration tank provided by the utility model is combined by modular filter assemblies, and is combined by a plurality of different structural members from top to bottom, the specific combination is freely changed according to requirements, and the plurality of filter assemblies are stacked in the mode of sealing bosses and sealing grooves, so that the combined microfiltration tank can be installed by hoisting without the need of infrastructure and on-site pouring, without the need of a maintenance period, and a large amount of time cost and labor cost is saved, and the mechanical friction of the static filter material and the rising filter material is caused by the fact that the backwashing of the first filter assembly is performed in each area, which is beneficial to the falling of pollutants, has the energy-saving effect compared with the whole simultaneous backwashing, the backwashing effect is better, and the technical problems of the prior art, such as large space occupation, difficult construction, high cost and poor backwashing, are solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the specific embodiments of the utility model or the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0024] Figure 1The whole structure schematic view of the combined micro-filter provided by the embodiment of the utility model;

[0025] Figure 2 The structure schematic view of the first filtering assembly in the combined micro-filter provided by the embodiment of the utility model;

[0026] Figure 3 The structure sectional view of the first filtering assembly in the combined micro-filter provided by the embodiment of the utility model;

[0027] Figure 4 The structure schematic view of the second filtering assembly in the combined micro-filter provided by the embodiment of the utility model; Figure 3

[0028] Figure 5 The structure schematic view of the third filtering assembly in the combined micro-filter provided by the embodiment of the utility model; Figure 4

[0029] Figure 6 The structure sectional view of the third filtering assembly in the combined micro-filter provided by the embodiment of the utility model;

[0030] Figure 7 The structure sectional view of the fourth filtering assembly in the combined micro-filter provided by the embodiment of the utility model;

[0031] Figure 8 The structure schematic view of the fifth filtering assembly in the combined micro-filter provided by the embodiment of the utility model;

[0032] Figure 9 The sectional view of K-K in the fifth filtering assembly in the combined micro-filter provided by the embodiment of the utility model;

[0033] Figure 10 The structure schematic view of the fifth filtering assembly in the combined micro-filter provided by the embodiment of the utility model; Figure 9

[0034] Figure 11 The structure sectional view of the fourth filtering assembly in the combined micro-filter provided by the embodiment of the utility model;

[0035] Figure 12 The structure sectional view of the fourth filtering assembly in the combined micro-filter provided by the embodiment of the utility model;

[0036] Figure 13 The structure sectional view of the fourth filtering assembly in the combined micro-filter provided by the embodiment of the utility model;

[0037] Figure 14 The structure sectional view of K-K in the fifth filtering assembly in the combined micro-filter provided by the embodiment of the utility model; Figure 13

[0038] The structure sectional view of K-K in the fifth filtering assembly in the combined micro-filter provided by the embodiment of the utility model; Figure 15 ​​​​

[0039] Figure 16 The reverse washing effect diagram of the first filter assembly in the combined micro-filter tank is provided for the embodiments of the present application;

[0040] Figure 17 The cooperation diagram of the sealing groove and the sealing boss in the combined micro-filter tank is provided for the embodiments of the present application;

[0041] Figure 18 The filter material flow diagram of the second filter assembly in the combined micro-filter tank is provided for the embodiments of the present application;

[0042] Figure 19 The stress diagram of the fold line inner wall in the combined micro-filter tank is provided for the embodiments of the present application;

[0043] Figure 20 The structure diagram of the sedimentation structure in the combined micro-filter tank is provided for the embodiments of the present application;

[0044] Figure 21 The installation structure diagram of the sedimentation structure in the combined micro-filter tank is provided for the embodiments of the present application;

[0045] Figure 22 The application scene diagram of the combined micro-filter tank is provided for the embodiments of the present application;

[0046] Figure 23 The application scene diagram of the combined micro-filter tank cooperating with the air compressor and the gas storage tank is provided for the embodiments of the present application.

[0047] Icon: 10-filter unit; 11-sealing groove; 12-sealing boss; 100-first filter assembly; 110-first filter body; 111-first hoisting connecting flange; 112-first water outlet flange; 113-vertical plate; 114-first water outlet pipe; 115-connecting plate; 120-division area; 130-area partition; 140-embedded bolt; 150-flat steel; 160-lower steel plate; 170-filter screen; 180-upper steel plate; 190-nut; 200-second filter assembly; 210-second filter body; 211-folded line inner wall; 220-second hoisting connecting flange; 300-third filter assembly; 310-third filter body; 320-third hoisting connecting flange; 330-third flow guide ring; 340-water inlet guide port; 350-third blowdown port; 400-fourth filter assembly; 410-fourth filter body; 420-fourth hoisting connecting flange; 430-fourth flow guide ring; 500-fifth filter assembly; 510-fifth filter body; 520-overflow groove; 530-fifth hoisting connecting flange; 540-embedded steel plate; 541-supporting steel pipe; 550-blowdown pipe; 600-settling structure; 610-sludge collection pipe; 620-settling cone; 630-perforated plate; 640-wire bolt; 650-cone upper edge. DETAILED DESCRIPTION

[0048] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0049] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "installation", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication inside two elements.For ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.

[0051] The specific embodiments of the utility model are described in detail below in combination with the drawings.It should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0052] As Figure 1 Indicated, the combined microfilter provided by the embodiment, including: filter unit 10;Filter unit 10 includes multiple filter assemblies sequentially stacked from bottom to top, and any two adjacent filter assemblies are connected by sealing groove 11 and sealing boss 12;Multiple filter assemblies include first filter assembly 100, second filter assembly 200, third filter assembly 300, fourth filter assembly 400 and fifth filter assembly 500;First filter assembly 100 has multiple partition areas 120, and first filter assembly 100 is configured to be able to backwash each partition area 120, so that the static filter material and the rising filter material produce mechanical friction;The inner wall of second filter assembly 200 is a broken line;Third filter assembly 300 is used to control the direction of water inlet;Fourth filter assembly 400 is used to provide filter layer backwash expansion space;Fifth filter assembly 500 is provided with overflow groove 520, and overflow groove 520 is used to collect backwash sewage.

[0053] The combined microfilter provided by the embodiment adopts cement microfiltration structural parts produced in factory, forms modular combination, the first combination is a microfiltration unit, that is, a microfilter, which is combined from multiple different structural parts from top to bottom, and the second combination is to combine multiple microfiltration units into a set of filtration system according to the needs of flow scale, to realize any flow scale.

[0054] Each filter unit 10 is divided into five different structural components from bottom to top, and the appearance is the same, which can be square or circular. For the convenience of description, the following description is based on square. The function of the first filter component 100 is reverse washing partition. The function of the second filter component 200 is to control the full contact of water flow and filter material. The function of the third filter component 300 is to control the rotation direction of water inlet. The function of the fourth filter component 400 is to provide reverse washing water expansion space. The function of the fifth filter component 500 is to collect reverse washing sewage and smoothly guide it out. The filter tank also has a sedimentation structure 600, which provides a static sedimentation area inside the filter tank.

[0055] Each component has the same size square shape. The upper and lower components have a contact plane, as shown in Figure 17 The lower end face of the upper component has a circle of raised sealing bosses 12, and the upper end face of the lower component has a circle of sealing grooves, which are larger than the sealing bosses and have a certain gap, so that the sealing bosses can be smoothly inserted. Before insertion, waterproof sealing glue is filled.

[0056] The first filter component 100 in the filter unit 10 is the lowermost structural member, which is poured with cement to form a five-sided body, that is, four walls plus a bottom surface. The horizontal cross-sectional area of the bottom surface is divided into multiple areas or squares, and each area is provided with a pipe for filtering outlet water, reverse flushing inlet water and air. The reverse flushing is performed area by area, so that the static filter material and the rising filter material produce mechanical friction, which is beneficial to the shedding of pollutants. Compared with simultaneous reverse flushing of the whole body, it has the advantages of energy saving and better reverse washing effect.

[0057] The second filter component 200 in the filter unit 10 is a four-sided body poured with cement, that is, a frame. The four walls have a certain thickness, and the height is the same as that of the first filter component 100, which is the contact part of the pool wall and the filter material. According to the height of the filter layer, different numbers of the same structural components can be stacked. In order to prevent water flow along the inner wall of the filter tank without passing through the filter layer, the inner wall adopts a zigzag line form. Between the two horizontal zigzag lines, filter material can be stored, thereby realizing the filtering and retaining effect.

[0058] The third filter component 300 in the filter unit 10 is a four-sided body poured with cement, that is, a frame. The four walls have a certain thickness, and the height is the same as that of the first filter component 100. The main function is to control the direction of water inlet. Since there is a circular structure design inside and the water inlet pipe port is provided with an elbow, the water flow enters along the tangent direction of the circular structure, so that the water flow rotates. At the same time, since the elbow is inclined upward at a certain angle, the continuous water flow is realized, which rotates continuously and moves upward.

[0059] The fourth filter assembly 400 of the filter unit 10 is a tetrahedron cast with cement, that is, a frame, the four walls of which have a certain thickness and the height of which is the same as that of the first filter assembly 100, for providing the height of the filter layer backwashing expansion space, and a plurality of identical assemblies can be stacked to increase the expansion space and meet the requirement of backwashing intensity.

[0060] The fifth filter assembly 500 of the filter unit 10 is a tetrahedron cast with cement, that is, a frame, the four walls of which have a certain thickness and the height of which is the same as that of the first filter assembly 100, for fixing the sedimentation structure 600, and an overflow groove 520 is arranged for collecting the backwashing sewage and discharging the sewage through a plurality of collecting pipes.

[0061] The sedimentation structure 600 of the filter unit 10 is a sedimentation device in the filter tank, which can be made of cement or metal. The sewage rotating upward from the third filter assembly 300 is continuously injected into the sedimentation structure 600, forming a stationary sedimentation zone inside, so that the suspended solids are continuously concentrated, and then discharged intermittently through the sewage discharge pipe 550. In this way, the filtration of suspended solids is avoided, and the accumulation of sludge layer on the surface of the filter layer is avoided, which leads to the continuous thickening of the sludge layer, the decrease of flow rate and the shutdown for backwashing, and the extension of the backwashing period. Dynamic balance is achieved.

[0062] The third filter assembly 300 adopts a rotating water inlet mode, which has two purposes. The first purpose is that after the filter layer traps suspended solids, the sludge layer is gradually accumulated on the surface of the filter layer and continuously thickened to form water flow resistance, which further leads to the gradual decrease of flow rate and the forced shutdown for backwashing. The rotating water flow mode forms friction between the water flow and the surface of the filter layer, and the shear force of the water flow destroys the sludge layer on the surface of the filter layer, which is beneficial to the deep penetration of the water flow into the filter layer, the delay of the decrease of flow rate, the extension of the effective filtration time and the extension of the backwashing period. Thus, the working efficiency is improved, and the water consumption and power consumption of frequent backwashing are reduced. The second purpose is that as the filtration time is prolonged, the concentration of suspended solids in the space above the filter layer is also gradually increased, and the rotating water flow is continuously rising. Due to the action of centrifugal force, the suspended solids are diffused to the surrounding, so as to enter the sedimentation structure 600. The suspended solids are then statically deposited in the sedimentation zone and discharged in time. That is, the suspended solids in the sewage have both input and output, rather than accumulation in the filter tank. Thus, the concentration of suspended solids accumulated in the sewage above the filter layer is delayed.

[0063] In the fifth filter assembly 500, a reverse tapered sedimentation structure 600 is arranged as a sedimentation area of the upper space of the filter layer. The water flow from the third filter assembly 300 is continuously rising, and the suspended matters gradually increasing are dispersed to the periphery by the centrifugal force, guided into the sedimentation area along the inclined surface of the sedimentation structure 600, and deposited in the sedimentation area without being disturbed by the external water flow, so that the suspended matters can be separated by deposition for a sufficient time, accumulated to a certain concentration, and discharged through the blowdown pipe 550 at a regular time, thereby forming a continuous filtering process. At the same time, the shear force of the rotating water flow destroys the sludge layer formed by the trapped suspended matters, which is beneficial to the continuous flow of the water flow through the filter layer, that is, the effective filtering time is prolonged, the backwashing period is prolonged, the deep filter layer is fully utilized and exerted, more suspended matters can be accommodated, and the filter layer capacity is improved.

[0064] The filter tank uses light microporous particles as filter material, such as sintered ceramic, volcanic rock, ceramsite, activated carbon and the like. The sintered microporous ceramic particles are preferred in terms of comprehensive technical performance. After a large number of tests, the following technical indexes are screened: particle size range: 0.5-5 mm, wherein a plurality of particle size ranges can be combined to meet different water quality requirements; specific gravity: 1.2-1.8 g / cm3; material: alumina-silicon dioxide composite material; porosity: 60-80%; and filter layer depth: 2.5-3.5 meters. The improvement of the filter layer is beneficial to improving the filtering precision, which is due to the backwashing mode of the utility model, which can ensure that the deep filter material can be effectively backwashed, thereby restoring the designed performance.

[0065] The combined micro filter tank provided by the embodiment can reduce the backwashing energy consumption and water consumption by about 60% compared with the conventional on-site cast quartz sand filter tank, can improve the filtering precision by one order of magnitude to less than 1 micron, can prolong the backwashing period by more than 2 times, solves the problem of filter material hardening, reduces the construction land area by about 20% compared with the conventional on-site cast quartz sand filter tank, saves the initial construction investment by about 30%, can be combined and configured in a plurality of different areas and shapes, has great flexibility, meets the site utilization requirements of users, shortens the construction period by about 80%, can be constructed in any season and temperature, does not need auxiliary sites, does not need commercial cement tank trucks, does not need on-site pouring cooperation with construction personnel and management personnel, does not need a maintenance period, and can immediately run water after hoisting and installing pipelines.

[0066] The structure and shape of the first filter assembly 100 are specifically as follows:

[0067] The first filter assembly 100 comprises a first filter body 110, and the first filter body 110 is a square or rectangular pool cast by cement, such as Figure 2, the step surface of the inner wall of the first filter body 110 is provided with a pre-buried bolt 140 for fastening the filter material supporting net during assembly, and a cement is used to make a regional partition 130 to divide the whole area into multiple divided areas 120, and one first water outlet pipe 114 is arranged outside each area, the first water outlet pipe 114 is matched with a first water outlet flange 112, and the first water outlet pipe serves as a water outlet pipe during filtration and as a backwashing water pipe and a backwashing air pipe during backwashing; four first hoisting connection flanges 111 are respectively designed at the four corners of the outer surface of the first filter body 110 and are pre-buried in the cement structure, the first hoisting connection flanges 111 have three functions, i.e., the first function is hoisting, the second function is used for fixing external structural members such as stairs, and the third function is used for connecting and fixing each other when multiple units form a system to increase stability.

[0068] As shown in Figure 3 , Figure 4 , Figure 5 , the flat steels 150 are placed on the step of the pre-buried bolt 140 and the upper edge of the partition, the flat steels 150 are arranged in parallel at equal intervals and are arranged in a vertical direction, the flat steels 150 are welded together at positions where the lengths of the flat steels 150 are equal to the widths of the flat steels 150 to form a support body covering the whole inner wall area of the pool, the support body can also be cut or spliced from a commercially available steel grating, a gap is cut at the abutting position of the flat steels 150 and the pool wall, and a lower steel plate 160 with a proper width is placed to form a support and sealing plane on which the filter net 170 is laid, the stainless steel net is laid on the parallel flat steels 150, and the number of layers of the filter net 170 is determined according to the type and particle diameter of the filter material filled above, the filter net 170 is specifically a stainless steel net, and the density aperture of the stainless steel net should be smaller than the minimum particle diameter of the filter material; all the filter nets 170, the upper steel plate 180 and the lower steel plate 160 pass through the pre-buried bolt 140 and are then locked by nuts 190; when the area of the filter net 170 is large, a vertical plate 113 with a proper height is used to press the filter net at equal intervals, and a connecting plate 115 can also be arranged to support the flat steels 150.

[0069] The first filter assembly 100 no longer uses a filter cap and a support plate structure, but uses a stainless steel filter net 170, according to common sense, the permeability of the stainless steel filter net to water flow or air flow is very good, and the resistance is very small, and in the whole filter area, there is no resistance of other components, the actual filter area of the water flow can reach about 70% of the whole filter area, thereby reducing the filter resistance and improving the filter efficiency.

[0070] During backwashing, due to the improved permeability and reduced resistance, the head of the backwashing water pump can be reduced by the same proportion, or the backwashing pressure can be reduced, that is, the energy-saving purpose is achieved.

[0071] A further description is as follows: The first filter component 100 adopts a zoned design, such as... Figure 16 As shown, the entire filter cross-section is divided into N regions, and the backwashing power of each region is 1 / N. For ease of description, two adjacent regions are named region A and region B. For example, region B is rinsed first by injecting backwash water or compressed air through the pipe, causing the filter media in region B to rise. However, no backwash water or compressed air is introduced into region A, and the filter media remains stationary. In this way, the rising and stationary filter media generate friction with each other, which helps to remove dirt from the filter media particles. When the filter media in region B rises, space is created at the bottom, and the filter media particles in region A move towards region B due to gravity. This continuously increases the amount of filter media falling from region B to region A, and so on, creating a cycle that improves the cleaning effect of the filter media, especially solving the problem of possible caking of the filter media. The same principle is used to continue rinsing region A until the backwashing of all regions is completed.

[0072] Regarding the structure and shape of the second filter component 200, specifically:

[0073] The second filter assembly 200 includes a second filter body 210, which is a square frame constructed by casting cement, such as... Figure 6 The outer and inner wall dimensions of the frame correspond to the outer and inner dimensions of the first filter body 110. Considering the convenience of production and transportation, the height is equal to that of the first filter body 110. The lower end face of the second filter body 210 is connected to the sealing groove 11 on the upper end face of the first filter body 110 through the sealing boss 12 to facilitate the upper and lower sealing connection. The upper end face of the second filter body 210 is provided with a sealing groove 11 to receive the sealing boss 12 of the upper component. When connecting, the sealing groove 11 and the boss are filled with sealant.

[0074] The inner wall of the second filter body 210 is a zigzag inner wall 211, such as... Figure 7 , Figure 18 , Figure 19 As shown, a right-angled triangle is raised, and the height of the triangle is 10-20% of the thickness of the filter wall, or more than 10 times the average diameter of the filter media particles.

[0075] The structure of the second filter body 210 is mainly to facilitate the filling of filter media and improve the filtration accuracy. Therefore, multiple second filter bodies 210 can be stacked one on top of the other to meet the filter layer height requirement. The higher the filter layer, the higher the filtration accuracy.

[0076] like Figure 6 As shown, the second filter body 210 is provided with a total of 4 second lifting connection flanges 220 around its perimeter. The first purpose is for lifting, the second is for installing accessories, such as escalators, and the third is to connect multiple component units to each other.

[0077] One or more second filter bodies 210 are arranged on the upper end face of the first filter body 110 to form a filter assembly, i.e. a microfiltration tank. The number of the second filter bodies 210 depends on the height of the filter material, and the height is proportional to the filtering accuracy. The higher the filter layer, the higher the filtering accuracy.

[0078] The wall of the conventional filter tank is smooth and straight. When filtering, the water flows vertically downward. The resistance of the water flow through the filter layer is greater than the resistance of the water flow along the tank wall. According to the law that the water flow tends to flow in the direction of smaller resistance, part of the water flow will not pass through the filter layer but directly pass through the tank wall. The present application adopts a zigzag form, and the zigzag has a shape and a specification. Specifically, the zigzag is a right triangle. The height of the triangle is 10-20% of the thickness of the filter tank wall or 10 times the average diameter of the filter material particles. More specifically, the distance between two triangles is less than the height of the triangle, which can accommodate a part of the filter material particles. When working, the water flows downward by pressure or gravity. When contacting the 45-degree inclined surface of the triangular zigzag, the zigzag surface generates a partial pressure. As shown in Figure 19 There is a force, and there is a counterforce. Thus, the zigzag generates a counter partial pressure, i.e. a counterforce, which generates turbulence here, increases the resistance of the water flow, and thus avoids the short-circuit phenomenon of the water flow, so that all the water flow will pass through the filter layer, ensuring stable filtering effect.

[0079] The structure and shape of the third filter assembly 300 are specifically as follows:

[0080] As shown in Figure 8 , Figure 9 , the third filter assembly 300 comprises a third filter body 310. The third filter body 310 is in the form of a frame. The outer periphery and the inner wall of the frame correspond to the outer periphery and the inner wall of the first filter body 110. The height of the third filter body 310 is equal to that of the first filter body 110, which is conducive to production and transportation. The lower end face of the third filter body 310 is provided with a sealing boss 12, which corresponds to a sealing groove 11 on the upper end face of the lower assembly, so as to be connected in a sealing manner. The upper end face of the third filter body 310 is provided with a sealing groove 11, which is used to accommodate the sealing boss 12 of the upper assembly. When connected, the sealing groove 11 and the boss are filled with sealing glue.

[0081] The inner wall of the third filter body 310 is provided with a third flow guide ring 330, which can be integrally poured with cement or fixed to the inner wall after being welded with a steel plate. The third filter body 310 is provided with a water inlet guide port 340 for a water inlet pipe to pass through. After passing through the third flow guide ring 330, the water inlet pipe is connected to an elbow, which is in the clockwise direction and is inclined upward by 30 degrees. Figure 10As shown, above the water inlet pipe, a pipeline is arranged again, and the purpose is to connect the subsequent assembly of the blow-off part, and a blow-off pipe 550 is arranged on the side of the water inlet pipe in the horizontal direction, and the purpose is to blow off before backwashing.

[0082] The third filter body 310 is provided with four third lifting connection flanges 320 around the periphery, which have three functions: first, for lifting; second, for installing accessories such as stairs; and third, when there are multiple assembly units, they can be connected to each other.

[0083] Due to the circular structure design inside the third filter body 310 and the elbow of the water inlet pipe port, the water flow enters along the tangent direction of the circular structure, causing the flow circle to rotate. At the same time, due to the upward inclination of the elbow at a certain angle, the continuous water flow rotates and moves upward. The purpose of this water inlet mode is twofold. First, after the filter layer traps suspended solids, a sludge layer will gradually accumulate on the surface of the filter layer and thicken, causing water flow resistance and thus gradually reducing flow rate and flow volume, forcing the machine to stop and backwash. The rotating water flow forms friction with the filter layer surface, and the shear force of the water flow destroys the sludge layer on the surface of the filter layer, which is beneficial to the water flow penetrating into the filter layer, delaying the flow rate decline, extending the effective filtration time, and prolonging the backwashing period, thereby improving work efficiency and reducing water and electricity consumption during frequent flushing.

[0084] The third filter body 310 is provided with a third blow-off port 350, which has two main functions. First, when the suspended solids in the water inlet are too high during filtration, the blow-off port can be used to reduce the suspended solids concentration in the wastewater above the filter layer. Second, when backwashing is needed, the blow-off pipe 550 is used to blow off until the water surface is lowered to the level of the blow-off pipe 550, thereby making the space above the blow-off pipe 550 an expanded space for the filter layer. Since the expansion is in the air rather than in water, it can effectively prevent filter material from entering the sediment funnel from above and prevent filter material loss during backwashing.

[0085] Regarding the structure and shape of the fourth filter assembly 400, specifically:

[0086] As Figure 11 、 Figure 12As shown, the fourth filter assembly 400 includes a fourth filter body 410, which is a square frame made of cement. The outer periphery and inner wall size of the frame correspond to the outer periphery and inner size of the first filter body 110. The height is equal to that of the first filter body 110, considering the facilitation of production and transportation. The lower end surface of the fourth filter body 410 is provided with a sealing boss 12 corresponding to the sealing groove 11 of the upper end surface of the underlying assembly, so as to be connected to the underlying assembly in a sealed manner. The upper end surface of the fourth filter body 410 is provided with a sealing groove 11 for receiving the sealing boss 12 of the upper assembly. When connected, the sealing groove 11 and the boss are filled with sealing glue.

[0087] The inner wall of the fourth filter body 410 is provided with a fourth flow guide ring 430, which can be integrally cast with cement or fixed to the inner wall after being welded with a steel plate.

[0088] The fourth filter body 410 is used to increase the space above the filter layer. One or more assemblies can be arranged according to the needs, and the fifth filter body 510 is arranged to accommodate the conical structure of the blowdown pipe 550.

[0089] The fourth filter body 410 is provided with four fourth lifting connection flanges 420 around the periphery. The first function is to facilitate lifting. The second function is to install accessories, such as stairs. The third function is to connect multiple assembly units to each other.

[0090] Regarding the structure and shape of the fifth filter assembly 500, in particular:

[0091] As shown in Figure 13 , Figure 14 , Figure 15 The fifth filter assembly 500 includes a fifth filter body 510, which is a square frame made of cement. The outer periphery and inner wall size of the frame correspond to the outer periphery and inner size of the first filter body 110. The height is equal to that of the first filter body 110, considering the facilitation of production and transportation. The upper end surface of the fifth filter body 510 is provided with a sealing groove 11 for receiving the upper assembly, such as a sealing cover. The lower end surface of the fifth filter body 510 is provided with a sealing boss 12 corresponding to the sealing groove 11 of the upper end surface of the underlying assembly, so as to be connected to the underlying assembly in a sealed manner. When connected, the sealing groove 11 and the boss are filled with sealing glue.

[0092] The inner wall of the fifth filter body 510 is provided with multiple pre-embedded steel plates 540 at appropriate positions, which cooperate with the support steel pipes 541 for later installation of the sedimentation structure 600.

[0093] The fifth filter body 510 is provided with four fifth lifting connection flanges 530 around the periphery. The first function is to facilitate lifting. The second function is to install accessories, such as stairs. The third function is to connect multiple assembly units to each other.

[0094] Along the upper edge of the fifth filter body 510 wall, the overflow groove 520 is designed, the water flow from the bottom to the top, over the overflow groove 520, through the multiple sewage pipe 550, in order to quickly discharge sewage, in the overflow groove side wall, the design of the multiple sewage pipe 550, after collecting sewage, to the sewage main pipe discharge.

[0095] Regarding the structure and shape of the sedimentation structure 600, in particular:

[0096] As shown in Figure 20 , Figure 21 , the sedimentation structure 600 includes sludge collection pipe 610, sedimentation cone 620, perforated plate 630 and wire bolt 640; the bottom of the sedimentation cone 620 is in communication with the sludge collection pipe 610; the top of the sedimentation cone 620 is provided with a cone upper edge 650, and the wire bolt 640 is connected to the cone upper edge 650, and the wire bolt 640 passes through the multiple perforated plates 630.

[0097] The perforated plate 630 is composed of multiple layers of perforated stainless steel plates, which are appropriately spaced from each other, and the wire bolt 640 passes through the multiple layers of perforated plates 630 and is fixed with the cone upper edge 650. A washer or nut 190 is arranged on the wire bolt 640 to adjust the distance between the perforated plates 630. The upper edge of the perforated plate 630 is flush with the cone upper edge 650, and the lower edge is parallel to the slope of the funnel and has a certain gap. The height of the gap is greater than the diameter of the largest filter material particles, so that the trapped filter material can slide down smoothly.

[0098] The fixing method of the sedimentation structure 600 is as shown in Figure 21 , a plurality of support steel pipes 541 are welded with the pre-embedded steel plates 540 of the four walls of the filter tank, thereby forming a solid whole. The high-concentration sludge collected by the sludge collection pipe 610 is discharged.

[0099] When using filter material with a relatively light specific gravity, it is possible that the filter material will float upwards during backwashing. If no measures are taken, it will cause the loss of filter material. The sedimentation structure 600 has multiple measures to block the filter material. First, during the upward floating process of the filter material, the cone slope has a certain blocking force, which causes a part of the filter material to collide and lose the power to continue floating, and then sink. Second, a small amount of filter material that continues to float upwards collides with the pool wall along the cone slope, which consumes part of the energy, causing this part of the filter material to sink. Third, if there is other filter material that has not sunk, it will be continuously collided and trapped by the multiple layers of perforated plates 630, causing it to sink and fall along the slope to the filter layer. Due to the adoption of these multiple measures, the loss of filter material is prevented.

[0100] In summary, each component can be combined into a filter unit 10, the first filter body 110 must be at the lower end to meet the working principle of the filter unit 10, both as a support for the overall unit, and as a filter catchment basin, but also to play a distribution role in backwashing, to achieve separate backwashing in different areas.

[0101] The second filter body 210 is at the upper end of the first filter body 110, and is a filter function area filled with filter material. According to the filtering precision requirement, multiple second filter bodies 210 can be placed one above the other to increase the height of the filter layer. The higher the filter layer, the higher the filtering precision. For example, if the height of the second filter body 210 is 1 meter, 1-5 components can be placed in stack. When lightweight filter material with a surface of multiple micropores is used, the relative filtering precision can reach 0.1 microns when the height of the filter layer is 3-3.5 meters, and the water output can reach or approach the effect of ultrafiltration membrane with appropriate process flow.

[0102] The third filter body 310 is a water inlet and sewage discharge pipe 550 layout area. Here, the water flow starts to rotate and move upward due to the addition of the flow guide ring. The third filter body 310 also connects the sewage discharge pipe 550 of the sedimentation structure 600.

[0103] The fourth filter body 410 is an overlying area for the upward water flow, and provides a space height for the expansion and boiling of the filter layer during backwashing. The sewage discharge pipe 550 of the sedimentation structure 600 passes through the third filter body 310 vertically.

[0104] The fifth filter body 510 is at the uppermost layer of the entire filter unit 10, and connects the fixed sedimentation structure 600. The overflow tank 520 prevents poor sewage discharge and accepts sewage water. The sewage is discharged through multiple sewage discharge pipes 550. The upper end surface of the component is provided with a sealing groove 11, and the upper cover can be installed as appropriate.

[0105] In addition, as shown in Figure 22 、 Figure 23 , multiple components can be combined into a unit to form a microfiltration tank, and multiple units can be combined into a system to adapt to larger flow rates.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. The modification or replacement does not change the essence of the corresponding technical solution from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A combined microfiltration basin, characterized in that, The utility model relates to a combined microfiltration tank, comprising: a filtering unit (10); the filtering unit (10) comprises a plurality of filtering assemblies which are sequentially stacked from bottom to top, and any two adjacent filtering assemblies are connected through a sealing groove (11) and a sealing boss (12); the plurality of filtering assemblies comprise a first filtering assembly (100), a second filtering assembly (200), a third filtering assembly (300), a fourth filtering assembly (400), and a fifth filtering assembly (500); the first filtering assembly (100) has a plurality of partition regions (120) therein, and the first filtering assembly (100) is configured to be capable of backwashing the partition regions (120) one by one, so that the static filter material and the ascending filter material generate mechanical friction; the inner wall of the second filtering assembly (200) is in a zigzag shape; the third filtering assembly (300) is used for controlling the direction of water inflow; the fourth filtering assembly (400) is used for providing a filter layer backwashing expansion space; the fifth filtering assembly (500) is provided with an overflow groove (520) for collecting backwashing sewage.

2. The combined microfiltration tank according to claim 1, wherein the first filtering assembly (100) comprises a first filtering body (110); the first filtering body (110) is provided with a region partition (130) therein, the region partition (130) is used for forming a plurality of the partition regions (120) in the internal space of the first filtering body (110), and each of the partition regions (120) is provided with a first water outlet pipe (114) correspondingly; the first filtering body (110) is provided with a first hoisting connection flange (111) and a first water outlet flange (112).

3. The combined microfiltration tank according to claim 2, wherein the inner wall of the first filtering body (110) has a stepped surface, and the stepped surface is provided with embedded bolts (140) sequentially penetrating through a flat steel (150), a lower steel plate (160), a filter screen (170), an upper steel plate (180), and a nut (190) from bottom to top; the first filtering body (110) is provided with a vertical plate (113) therein, and the vertical plate (113) is used for pressing the filter screen (170); the first filtering body (110) is provided with a connecting plate (115) therein, and the connecting plate (115) is used for supporting the flat steel (150).

4. The combined microfiltration tank according to claim 1, wherein the second filtering assembly (200) comprises a second filtering body (210); the second filtering body (210) is provided with a second hoisting connection flange (220); the inner wall of the second filtering body (210) is in a zigzag shape, and the second filtering body (210) stores filter material therein.

5. The combined microfiltration tank according to claim 1, wherein the third filtering assembly (300) comprises a third filtering body (310); the third filtering body (310) is provided with a third hoisting connection flange (320). A third flow guide ring (330) is arranged in the third filter body (310), and is used to make the water flow in the third filter body (310) move upwards in rotation.

6. The combined micro-filter tank according to claim 5, characterized in that, The third filter body (310) is provided with a water inlet guide port (340) for the water inlet pipe to pass through. The third filter body (310) is provided with a third blowdown port (350).

7. The combined micro-filter tank according to claim 1, characterized in that, The fourth filter assembly (400) comprises a fourth filter body (410). The fourth filter body (410) is provided with a fourth lifting connection flange (420). The fourth filter body (410) is provided with a fourth flow guide ring (430).

8. The combined micro-filter tank according to claim 1, characterized in that, The fifth filter assembly (500) comprises a fifth filter body (510). The fifth filter body (510) is provided with a fifth lifting connection flange (530). The inner wall of the fifth filter body (510) is bent inwardly to form the overflow groove (520), and the liquid in the overflow groove (520) is led out through the blowdown pipe (550).

9. The combined micro-filter tank according to claim 8, characterized in that, The combined micro-filter tank further comprises a sedimentation structure (600). The fifth filter body (510) is provided with a plurality of embedded steel plates (540) for supporting the sedimentation structure (600) in the fifth filter body (510).

10. The combined micro-filter tank according to claim 9, characterized in that, The sedimentation structure (600) comprises a sludge collection pipe (610), a sedimentation cone (620), a plurality of porous plates (630), and a through-wire bolt (640). The bottom of the sedimentation cone (620) is in communication with the sludge collection pipe (610). The top of the sedimentation cone (620) is provided with a cone upper edge (650), the cone upper edge (650) is connected with the through-wire bolt (640), and the through-wire bolt (640) passes through a plurality of the porous plates (630).

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