horizontal flow filter

Abstract

The application discloses a horizontal circular flow filter tank, which comprises a body with a hollow structure, a sewage inlet and a clean water outlet; a filter assembly arranged in the body and adapted to filter water flowing therethrough, the filter assembly being arranged upstream of the clean water outlet; a circular flow filtering area communicating with the sewage inlet and located upstream of the filter assembly, the circular flow filtering area comprising at least a horizontal sweeping flow layer in contact with the filter assembly, the water in the horizontal sweeping flow layer having at least a horizontal tangential component when flowing through the filter assembly, so that the pollutants located at the upper part of the filter assembly are washed from the upstream side of the horizontal sweeping flow layer to the downstream side of the horizontal sweeping flow layer along the top wall of the filter assembly. The application can wash the pollutants located at the upper part of the filter assembly, so that the pollutants cannot be accumulated on the surface of the filter assembly too early, and the cleaning cycle of the horizontal circular flow filter tank can be prolonged, the cleaning frequency can be reduced, and energy consumption can be saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of horizontal ring flow filter, in particular to a horizontal ring flow filter. BACKGROUND

[0002] In the horizontal ring flow filter, quartz sand is often used as the material for filtering sewage. Quartz sand filtration is a water treatment device that uses quartz sand as a filter medium to filter water with high turbidity through a certain thickness of granular or non-granular quartz sand under a certain pressure, effectively removing suspended solids, organic matter, colloidal particles, microorganisms and part of heavy metal ions in the water, and ultimately achieving the effect of reducing water turbidity and purifying water quality.

[0003] In the prior art horizontal ring flow filter, the sewage is filtered from top to bottom during the treatment process. At this time, the sewage above the filter layer will continuously impact the filter layer while passing through the filter layer. Along the height direction, the filter layer above will be first blocked by the pollutants in the sewage. As the filtration operation continues, the blocked area of the filter layer from top to bottom will increase. In order to ensure the filtration efficiency of the filter layer, frequent reverse flushing operation is usually required to purify the filter layer.

[0004] In order to solve the above problems, the prior art discloses a horizontal ring flow filter, which can form an upper cyclone zone and a lower cyclone zone at the upper and lower ends of the filter layer. In the upper and lower cyclone zones, the sewage rotates in the horizontal plane. Then it enters the filter layer upward or downward, forms clear water in the filter layer after washing through the filter layer, and is discharged.

[0005] Generally, due to the circular rotation of the sewage on the surface of the filter layer, compared with the conventional way of vertically entering the filter layer, the horizontally flowing sewage will flush away the pollutants on the surface of the filter layer, so that the pollutants will not enter the filter layer too early and block the filter layer. However, in the above structure, since the sewage itself still rotates back and forth in the horizontal area, the pollutants on the surface of the filter layer will circulate in a limited space and the total amount will increase. When a certain amount is reached, sedimentation will still occur, which will block the filter layer on one side and affect the subsequent sewage purification operation. SUMMARY

[0006] Therefore, the technical problem to be solved by the present application is to overcome the defects in the prior art horizontal ring flow filter, in which the sewage flows in a ring shape in the horizontal area, which easily pollutes the filter layer and affects the purification operation.

[0007] To this end, the embodiments of the present application provide a horizontal ring flow filter, which comprises:

[0008] a body with a hollow structure inside, having a sewage water inlet and a clean water outlet;

[0009] a filter assembly arranged in the body and adapted to filter water flowing therethrough, the filter assembly being arranged upstream of the clean water outlet;

[0010] a circular flow filtering area communicating with the sewage water inlet and being arranged upstream of the filter assembly, the circular flow filtering area comprising at least a horizontal sweeping flow layer in contact with the filter assembly, water in the horizontal sweeping flow layer having at least a horizontal tangential component when flowing through the filter assembly, so as to flush pollutants located at an upper position of the filter assembly from an upstream side of the horizontal sweeping flow layer to a downstream side of the horizontal sweeping flow layer along a top wall of the filter assembly.

[0011] Optionally, the circular flow filtering area further comprises, in sequence along a transport direction of the water, an ascending area, a slow flow area and a descending area, which are in communication with each other.

[0012] The horizontal sweeping flow layer, the ascending area, the slow flow area and the descending area are in communication with each other in sequence.

[0013] The sewage water inlet of the circular flow filtering area is arranged at an upstream side of the horizontal sweeping flow layer, and the water flowing in can flow through the horizontal sweeping flow layer, the ascending area, the slow flow area and the descending area in sequence, so as to realize circular flow of the water in the circular flow filtering area and separate pollutants in the water.

[0014] Optionally, the ascending area is provided with a flow guide structure, the flow guide structure comprising:

[0015] a flow guide plate arranged in the ascending area and forming a flow guide channel with a side wall of the ascending area, the flow guide channel being adapted to guide the water upward.

[0016] Optionally, the body further has a backwashing water outlet communicating with the circular flow filtering area, when backwashing, the water can flow through the filter assembly and the circular flow filtering area in sequence and be discharged to the outside of the body through the backwashing water outlet.

[0017] Optionally, the flow guide structure further comprises:

[0018] a first sand baffle connected to a bottom side of the flow guide plate, a lower end of the first sand baffle extending towards a side wall of the body; and / or, the flow guide structure further comprises:

[0019] a second sand baffle connected to a top side of the flow guide plate, a top end of the second sand baffle extending towards a center of the body.

[0020] Optionally, the horizontal circular flow filter further comprises:

[0021] A clear water zone is located downstream of the filter assembly and communicates with the clear water outlet, and is adapted to collect and discharge the water filtered by the filter assembly.

[0022] Optionally, the clear water zone comprises:

[0023] A first clear water zone adapted to collect the water filtered by the filter assembly;

[0024] A second clear water zone located downstream of the first clear water zone and communicating with the first clear water zone and the clear water outlet, the second clear water zone being higher than the circular flow filter zone.

[0025] In the filtration state, the filtered water can be discharged from the clear water outlet through the first and second clear water zones; in the backwashing state, the water in the second clear water zone is adapted to flow through the first clear water zone, the filter assembly and the circular flow filter zone in sequence under the action of gravity when the sewage inlet and the clear water outlet are closed, and is discharged from the backwashing water outlet to the outside of the body.

[0026] Optionally, the horizontal circular flow filter further comprises:

[0027] A backwashing water distribution pipe arranged in the clear water zone and corresponding to the filter assembly, and adapted to provide backwashing water to the filter assembly.

[0028] Optionally, a plurality of the circular flow filter zones are arranged in the body in a ring shape, and the backwashing water distribution pipe is arranged at the center of the body and communicates with the circular flow filter zones.

[0029] Optionally, the horizontal circular flow filter further comprises:

[0030] A coagulation zone communicating with the sewage inlet and located upstream of the circular flow filter zone, and adapted to coagulate the water flowing in.

[0031] Optionally, a plurality of spoiler plates are arranged on the side wall of the coagulation zone at intervals, the spoiler plates separate the coagulation zone into a plurality of interconnected cabins, and the water flowing through the coagulation zone can hit the spoiler plates, so that the water and the chemicals are mixed when the chemicals are added in the coagulation zone.

[0032] The technical scheme of the present application has the following advantages:

[0033] 1. In the present application, sewage enters the body from the sewage inlet to the internal circular flow filtration zone. Due to the horizontal tangential force of the water body in the upper part of the filter assembly, the pollutants located in the upper part of the filter assembly can be washed from the upstream side of the horizontal sweeping layer to the downstream side of the top wall of the filter assembly, without accumulating prematurely on the surface of the filter assembly, thereby prolonging the cleaning cycle of the horizontal circular flow filter, reducing the cleaning frequency, and saving energy. At the same time, part of the water body in the horizontal sweeping layer penetrates the filter assembly for filtration under the action of gravity. Since the horizontal sweeping layer horizontally sweeps the sewage, the filtration period is prolonged, and the filtered water has better quality, better continuity, and higher yield.

[0034] In addition, due to the prolonged filtration period, the requirements for the filter assembly itself are also reduced. At this time, the filter assembly itself can complete the purification operation for a long time without being set too deep. This helps to control the volume of the entire device, helps to control the cost and reduces the construction difficulty.

[0035] 2. In the present application, when filtering sewage, the pollutants in the sewage can continuously participate in the circulation flow in the circular flow filtration zone. By setting the circular flow filtration zone, the pollutant space in the upper part of the filter assembly can be increased, and the pollutant capacity of the horizontal circular flow filter can be improved.

[0036] 3. In the present application, the setting of the guide channel can guide the upward flow of the water body and avoid short flow during the upward flow of the water body.

[0037] 4. In the present application, by performing reverse flushing on the horizontal circular flow filter, the pollutants blocked in the filter assembly and the pollutants contained in the circular flow filtration zone can be flushed and discharged outside the body together, thereby improving the filtration effect.

[0038] 5. In the present application, by setting the first sand baffle, part of the filter material layer flowing into the guide channel during backwashing can fall back to the side of the filter assembly close to the first sand baffle under the action of its own gravity. By setting the second sand baffle, the filter material layer flowing into the circular flow filtration zone during backwashing can fall back to the side of the filter assembly close to the first sand baffle along the second sand baffle and the guide channel after backwashing is completed, thereby avoiding the concentration of all filter material layers on the top of the filter assembly, ensuring the flatness of the filter material layer and the stability of the later filtration effect.

[0039] 6. The first and second embodiments of the present application adopt a self-backwashing mode, in which the sewage inlet and the clean water inlet are closed in the backwashing state, the water in the second clean water zone flows through the first clean water zone, the filter assembly and the circular flow filter zone in turn under the action of gravity, reversely washing the filter assembly and the circular flow filter zone, and hydraulically scrubbing the pollutants blocked in the filter assembly to expand the filter material layer; at the same time, the pollutants in the filter assembly and the circular flow filter zone are discharged out of the body. The self-backwashing mode can realize backwashing of the equipment without additional hydraulic lifting device, thereby reducing the equipment investment cost and saving energy consumption.

[0040] 7. In the present application, a coagulation zone is arranged upstream of the circular flow filter zone, and in the case of slightly polluted water, a medicament can be added in the coagulation zone, so that the sewage can collide with the spoiler when flowing through the coagulation zone, thereby fully mixing with the medicament; when no medicament is needed, the coagulation zone can be used as a larger water distribution tank for uniform water inlet.

[0041] 8. The third and fourth embodiments of the present application adopt an external pressure backwashing mode, in which, during backwashing, an external clean water is pressurized into the backwashing water distribution pipe by a hydraulic lifting device such as a water pump, the backwashing water distribution pipe distributes water into the clean water zone, and the water flows through the filter assembly and the circular flow filter zone in turn to realize backwashing. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0043] Figure 1 FIG. 1 is a structural schematic diagram of the horizontal circular flow filter tank in the first embodiment of the present application;

[0044] Figure 2 FIG. 2 is a top view of the horizontal circular flow filter tank in the first embodiment of the present application; Figure 1

[0045] Figure 3 FIG. 3 is a structural schematic diagram of the horizontal circular flow filter tank in the second embodiment of the present application;

[0046] Figure 4 FIG. 4 is a structural schematic diagram of the horizontal circular flow filter tank in the third embodiment of the present application;

[0047] Figure 5 FIG. 5 is a structural schematic diagram of the horizontal circular flow filter tank in the fourth embodiment of the present application;

[0048] Figure 6 ​Structure diagram of horizontal circular flow filter tank in the fifth embodiment of the present application;

[0049] Figure 7 Structure diagram of horizontal circular flow filter tank in the sixth embodiment of the present application.

[0050] Explanation of reference signs:

[0051] 1, body; 11, sewage inlet; 12, clean water outlet; 13, backwash water outlet;

[0052] 2, filter assembly; 21, filter material layer; 22, filter cap;

[0053] 3, circular flow filtering area; 31, horizontal sweeping layer; 32, upward area; 33, slow flow area; 34, downward area; 351, first chamfered plate; 352, second chamfered plate; 353, third chamfered plate;

[0054] 4, flow guide structure; 41, flow guide plate; 411, flow guide channel; 42, first sand blocking plate; 43, second sand blocking plate;

[0055] 5, clean water area; 51, first clean water area; 52, second clean water area; 53, clean water communication pipe;

[0056] 61, backwash water distribution pipe; 62, backwash water drainage groove;

[0057] 7, coagulation area; 71, spoiler plate. DETAILED DESCRIPTION

[0058] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part 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 labor fall within the scope of protection of the present application.

[0059] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 limiting 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.

[0060] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0062] Embodiment 1

[0063] As Figures 1-2 shown, the horizontal circulating filter provided by the embodiment of the present application comprises a body 1, a filter assembly 2 and a circulating filtration zone 3. Specifically, the body 1 is internally hollow, has a sewage inlet 11 and a clean water outlet 12, sewage is introduced into the interior of the body 1 from the sewage inlet 11, and the clean water obtained by treating the sewage through the filter assembly 2 is discharged to the outside of the body 1 through the clean water outlet 12; the filter assembly 2 is arranged in the body 1 and is adapted to filter the water flowing therethrough, and the filter assembly 2 is arranged upstream of the clean water outlet 12; the circulating filtration zone 3 is in communication with the sewage inlet 11, and the circulating filtration zone 3 is located upstream of the filter assembly 2, and the circulating filtration zone 3 at least comprises a horizontal sweeping layer 31 in contact with the filter assembly 2, the water in the horizontal sweeping layer 31 has at least a horizontal tangential component when flowing through the filter assembly 2, and is adapted to flush the pollutants located at the upper position of the filter assembly 2 from the upstream side of the horizontal sweeping layer 31 to the downstream side of the horizontal sweeping layer 31 along the top wall of the filter assembly 2.

[0064] As Figure 1 indicated by the arrows in the figure, the upstream side of the horizontal sweeping layer 31 is located at the outer position of the body away from the central region, and the downstream side of the horizontal sweeping layer 31 is located at the central region of the body. With the progress of the filtration operation, the pollutants will continuously flow from the outer position to the central region and deposit near the central region.

[0065] In this way, sewage enters the annular flow filtering area 3 inside the body 1 from the sewage inlet 11. Since the water body of the horizontal sweeping flow layer 31 at the upper part of the filtering assembly 2 has a horizontal tangential component, the pollutants located at the upper part of the filtering assembly 2 can be washed from the upstream side of the horizontal sweeping flow layer 31 to the downstream side of the top wall of the filtering assembly 2, and will not be accumulated on the surface of the filtering assembly 2 too early, so that the cleaning cycle of the horizontal annular flow filter can be prolonged, the cleaning frequency can be reduced, and the energy consumption can be saved. At the same time, part of the water body of the horizontal sweeping flow layer 31 penetrates into the filtering assembly 2 for filtration under the action of gravity. Since the horizontal sweeping flow layer 31 performs horizontal sweeping flow on the sewage, the filtration cycle can be prolonged, the quality of the clean water produced by filtration is better, the continuity is better, and the water production is large.

[0066] Optionally, the body 1 of the horizontal annular flow filter in the embodiment can be made of a metal material, can be a pool body made of a concrete structure, or can be made of other materials, and the embodiment does not limit this; preferably, the body 1 is made of a steel structure. Optionally, the sewage enters the body 1 for filtration by gravity flow or pressure flow.

[0067] Optionally, the filtering assembly 2 comprises a filter material layer 21. Optionally, the filter material layer 21 is quartz sand or other filtering materials. Optionally, the filtering assembly 2 further comprises a filter cap 22 arranged at the bottom of the filter material layer 21.

[0068] Optionally, along the transportation direction of the water body, the annular flow filtering area 3 further comprises an ascending area 32, a slow flow area 33 and a descending area 34 which are in communication with each other: the horizontal sweeping flow layer 31, the ascending area 32, the slow flow area 33 and the descending area 34 are in communication in sequence; the inlet of the annular flow filtering area 3 is arranged at the upstream side of the horizontal sweeping flow layer 31, and the water body flowing in can flow through the horizontal sweeping flow layer 31, the ascending area 32, the slow flow area 33 and the descending area 34 in sequence, so as to realize the annular flow of the water body inside the annular flow filtering area 3, and separate the pollutants in the water body.

[0069] When the horizontal annular flow filter in the embodiment filters the sewage, the pollutants in the sewage can continuously participate in the circulation flow in the annular flow filtering area 3. By arranging the annular flow filtering area 3, the pollutant space at the upper part of the filtering assembly 2 can be increased, and the pollutant capacity of the horizontal annular flow filter can be improved.

[0070] The water inlet of the circular flow filtering area 3 is directed to the center of the body 1, and the water inlet of the circular flow filtering area 3 is smaller than the water inlet of the body 1, so that the sewage flows into the circular flow filtering area 3 at a high speed in a manner of approximately parallel to the surface layer of the filtering assembly 2 to form a horizontal sweeping flow layer 31; according to Bernoulli's principle, the water body in the falling area 34 of the circular flow filtering area 3 will keep the direction when falling into the upstream side of the horizontal sweeping flow layer 31 due to the pressure difference, that is, the direction is consistent with the flow direction of the water body in the horizontal sweeping flow layer 31. Optionally, the lower end of the side wall of the rising area 32 is arranged close to the downstream side of the horizontal sweeping flow layer 31 and connected with the filtering assembly 2 to form a first chamfer plate 351, which has an upward slope, so that the water body flows along the slope of the first chamfer plate 351 when flowing through the downstream side of the horizontal sweeping flow layer 31 and flows to the rising area 32. Optionally, the upper end of the side wall of the rising area 32 is obliquely provided with a second chamfer plate 352, and the upper end of the side wall of the falling area 34 is obliquely provided with a third chamfer plate 353, so that the water body can smoothly flow from the rising area 32 to the slow flow area 33 and then flow from the slow flow area 33 to the falling area 34, thereby forming a circular flow in the circular flow filtering area 3.

[0071] It should be noted that the slow flow area 33 in the embodiment refers to that the water body flowing upward in the rising area 32 slows down due to its own gravity, changes direction after passing through the second chamfer plate 352 of the side wall of the rising area 32 and flows to the upstream side of the falling area 34, and the area between the downstream side of the rising area 32 and the upstream side of the falling area 34 is the slow flow area 33.

[0072] Optionally, a flow guide structure 4 is arranged in the rising area 32, and the flow guide structure 4 comprises a flow guide plate 41, which is arranged in the rising area 32 and forms a flow guide channel 411 between the flow guide plate 41 and the side wall of the rising area 32, and the flow guide channel 411 is adapted to guide the water body upward. The arrangement of the flow guide channel 411 can guide the upward flow of the water body and avoid short flow of the water body during the upward flow.

[0073] As the filtering time goes on, the concentration of pollutants in the circular flow filtering area 3 becomes higher and higher; in addition, after long-term filtering operation, the filtering effect is reduced due to the blockage of pollutants in the filtering assembly 2. Therefore, the horizontal circular flow filter needs to be cleaned, and the common cleaning method is to perform reverse flushing on the equipment.

[0074] Optionally, the body 1 also has a backwashing water outlet 13, which is in communication with the circular flow filtering area 3, and when reverse flushing, the water body can flow through the filtering assembly 2 and the circular flow filtering area 3 in sequence and then be discharged to the outside of the body 1 through the backwashing water outlet 13. By performing reverse flushing on the horizontal circular flow filter, the water body can flush and discharge the pollutants blocked in the filtering assembly 2 and the pollutants contained in the circular flow filtering area 3 to the outside of the body 1, thereby improving the filtering effect.

[0075] Compared with the conventional design, the embodiment adopts the filtering mode of horizontal sweeping flow. Since the filtering period is prolonged, the requirement for the filtering assembly 2 itself is reduced, the thickness of the filter material layer 21 required can be reduced, the height of the body 1 can be reduced, and thus the investment cost is reduced. Meanwhile, since the thickness of the filter material layer 21 is reduced, the amount of backwashing water can be reduced, the duration of backwashing is short, and the energy consumption is saved.

[0076] Optionally, the flow guide structure 4 further comprises a first sand baffle 42, the upper end of the first sand baffle 42 is connected with the bottom side of the flow guide plate 41, and the lower end extends towards the sidewall of the body 1. By arranging the first sand baffle 42, when backwashing, part of the filter material layer 21 flowing into the flow guide channel 411 can fall back to the side of the filtering assembly 2 close to the first sand baffle 42 under the action of gravity.

[0077] Optionally, the flow guide structure 4 further comprises a second sand baffle 43, the lower end of the second sand baffle 43 is connected with the top side of the flow guide plate 41, and the top end extends towards the center of the body 1. By arranging the second sand baffle 43, when backwashing, the filter material layer 21 flowing into the circular flow filtering area 3 can fall back to the side of the filtering assembly 2 close to the first sand baffle 42 along the second sand baffle 43 and the flow guide channel 411 after backwashing, so that the filter material layer 21 is prevented from falling back to the top of the filtering assembly 2, and thus the flatness of the filter material layer 21 and the stability of the later filtering effect are ensured.

[0078] Optionally, the horizontal circular flow filter tank further comprises a clean water area 5, the clean water area 5 is located downstream of the filtering assembly 2 and is connected with the clean water outlet 12, and is suitable for collecting and discharging the water filtered by the filtering assembly 2. Optionally, the backwashing water obtained through backwashing is discharged into other horizontal circular flow filter tanks for filtering treatment.

[0079] In the embodiment, optionally, the clean water area 5 comprises a first clean water area 51 and a second clean water area 52, the first clean water area 51 is suitable for collecting the water filtered by the filtering assembly 2; the second clean water area 52 is located downstream of the first clean water area 51 and is connected with the first clean water area 51 and the clean water outlet 12, and the second clean water area 52 is higher than the circular flow filtering area 3; in the filtering state, the filtered water can be discharged from the clean water outlet 12 through the first clean water area 51 and the second clean water area 52; in the backwashing state, the water in the second clean water area 52 is suitable for flowing through the first clean water area 51, the filtering assembly 2 and the circular flow filtering area 3 in sequence under the action of gravity when the sewage inlet 11 and the clean water outlet 12 are closed, and is discharged from the backwashing water outlet 13 to the outside of the body 1.

[0080] In the self-backwashing mode, the sewage inlet 11 and the clean water outlet 12 are closed, and the water in the second clean water area 52 flows through the first clean water area 51, the filter assembly 2 and the circular flow filtering area 3 in sequence under the action of gravity, thereby backwashing the filter assembly 2 and the circular flow filtering area 3, and the pollutants in the filter assembly 2 are removed by hydraulic scouring, and the filter material layer 21 is expanded. At the same time, the pollutants in the filter assembly 2 and the circular flow filtering area 3 are discharged out of the body 1. The self-backwashing mode does not need to additionally provide a hydraulic lifting device such as a water pump, and can backwash the equipment, thereby reducing the investment cost of the equipment and saving energy consumption.

[0081] Optionally, the horizontal circular flow filter further comprises a coagulation area 7, which is in communication with the sewage inlet 11 and located upstream of the circular flow filtering area 3, and is suitable for coagulation treatment of the water entering.

[0082] The coagulation area 7 is provided upstream of the circular flow filtering area 3, and when the water is slightly polluted, the coagulation area 7 can be used to add reagents, and the sewage can collide with the baffles 71 when flowing through the coagulation area 7, thereby fully mixing with the reagents. When no reagent is needed, the coagulation area 7 can be used as a larger water distribution bin for uniform water inlet.

[0083] Optionally, the circular flow filtering area 3 and the filter assembly 2 correspondingly form a group of filtering units, the filtering units are provided in multiple groups, and the multiple groups of filtering units are arranged in a ring shape in the body 1. Correspondingly, the sewage inlet 11, the clean water outlet 12 and the backwashing water outlet 13 are also correspondingly provided in multiple numbers.

[0084] Optionally, in the embodiment, the coagulation area 7 is provided in multiple numbers and corresponds to the filtering units one by one, and the coagulation area 7 is arranged around the outer periphery of the circular flow filtering area 3, and is formed between the outer side wall of the descending area 34 and the inner wall of the body 1. Optionally, the bottom end of the coagulation area 7 is formed with a horizontal flow passage, so that the water in the coagulation area 7 flows into the circular flow filtering area 3 at a high speed in a manner of approximately parallel to the upper surface of the filter assembly 2 through the horizontal flow passage. Optionally, the bottom end of the two opposite side walls of the coagulation area 7 is correspondingly provided with a wall plate, and the horizontal flow passage is formed between the two oppositely arranged wall plates.

[0085] In the embodiment, the adjacent two groups of filtering units have a preset interval, so that the first clean water area 51 and the second clean water area 52 located on the upper and lower sides of the filtering units are in communication in the body 1.

[0086] As an embodiment, the clear water zone 5 is in communication with each of the ring flow filtration zones 3, so that the backwashing of multiple ring flow filtration zones 3 can be simultaneously performed, thereby improving the backwashing efficiency of the whole horizontal ring flow filter.

[0087] Alternatively, as another embodiment, not shown in the drawings, two ring flow filtration zones 3 are a group in the width direction of the body, and multiple clear water zones 5 are provided in the length direction of the body 1, and the multiple clear water zones 5 are one-to-one correspondingly arranged between the group of ring flow filtration zones 3. In this way, when the ring flow filtration zones 3 do not need to be backwashed, the backwashing of a certain group of ring flow filtration zones 3 can be performed without the need to simultaneously backwash all the ring flow filtration zones 3. When the backwashing of a certain group of ring flow filtration zones 3 is performed, it will not affect the filtration operation of other groups of ring flow filtration zones 3.

[0088] In the embodiment, the backwashing water outlet 13 is in communication with the top wall of the ring flow filtration zone 3 through a pipeline, so that the water can be discharged from the ring flow filtration zone 3 to the body 1 through the pipeline during backwashing.

[0089] Preferably, the filtration units are arranged as four groups in the body 1, and the coagulation zone 7 is arranged as four groups, which are one-to-one correspondingly arranged with the filtration units and are arranged around the outer periphery of the filtration assembly 2. Of course, the number of groups of filtration units can be adjusted according to actual conditions, which is not limited in the embodiment.

[0090] Embodiment 2

[0091] As shown in Figure 3 , and referring to Figures 1-2 , the horizontal ring flow filter in the embodiment is the same as the remaining structure of the embodiment 1, and the difference is that in the embodiment, the ring flow filtration zone 3 and the filtration assembly 2 correspond to form a group of filtration units, the filtration units are arranged as multiple groups, and the multiple groups of filtration units are arranged in a ring shape in the body 1. The coagulation zone 7 is arranged as one, and the multiple groups of filtration units are arranged around the outer periphery of the coagulation zone 7. Alternatively, the outer side wall of the multiple descending zones 34 forms the coagulation zone 7. The sewage inlet 11 on the body 1 is in communication with the water inlet of the coagulation zone 7 through a pipeline.

[0092] Alternatively, the clear water communication pipe 53 is arranged outside the body 1. Of course, the clear water communication pipe 53 can also be arranged in the body 1, which is not limited in the embodiment.

[0093] The embodiment can achieve the beneficial effects of the embodiment 1, which will not be described herein.

[0094] Embodiment 3

[0095] As shown in Figure 4 , and referring to Figures 1-2The horizontal circulating filter tank in the embodiment has the same structure as that of the remaining part of the embodiment 1, except that the horizontal circulating filter tank in the embodiment further comprises a backwashing water distribution pipe 61 arranged in the clear water zone 5 and corresponding to the filter assembly 2, and adapted to provide backwashing water to the filter assembly 2. Optionally, the backwashing water distribution pipe 61 is uniformly provided with a plurality of water outlet holes on the peripheral wall, and the filter assembly 2 can be uniformly distributed with water during backwashing. Optionally, the circulating filter zone 3 is arranged in a plurality of annular arrangements in the body 1, and the backwashing water distribution pipe 61 is arranged at the central part of the body 1 and communicates with the circulating filter zone 3.

[0096] In the horizontal circulating filter tank in the embodiment, the clear water zone 5 is arranged at the lower part of the body 1, and during filtration, the filtered water can be discharged from the clear water zone 5 at the lower part of the body 1 through the clear water outlet 12. Meanwhile, the backwashing mode of the external source pressure is adopted in the embodiment, and during backwashing, the external clear water is pressurized and sent into the backwashing water distribution pipe 61 through the hydraulic lifting device such as a water pump, the backwashing water distribution pipe 61 distributes water into the clear water zone 5, and sequentially flows through the filter assembly 2 and the circulating filter zone 3, so as to realize backwashing.

[0097] Optionally, in the embodiment, the top parts of the plurality of circulating filter zones 3 are communicated with each other, the backwashing water distribution pipe 61 communicates with the plurality of circulating filter zones 3, and the plurality of circulating filter zones 3 can be simultaneously backwashed through the backwashing water distribution pipe 61, so as to improve the backwashing efficiency of the whole horizontal circulating filter tank device.

[0098] Optionally, the backwashing water drainage groove 62 is formed between the adjacent two circulating filter zones 3, and the backwashing water drainage groove 62 communicates with the circulating filter zone 3 and the backwashing water outlet 13, so as to collect and discharge the backwashing water in the adjacent two circulating filter zones 3 after backwashing. Preferably, the backwashing water drainage groove 62 is formed by the opposite side walls of the adjacent two circulating filter zones 3. Optionally, the backwashing water outlet 13 on the body 1 communicates with the backwashing water drainage groove 62 through a pipeline. Of course, the backwashing water outlet 13 can also be arranged on the top wall or the side wall of the body 1 which communicates with the circulating filter zone 3, and the person skilled in the art can design according to the actual needs, and the embodiment does not limit the same.

[0099] The embodiment can also achieve the other beneficial effects as those of the embodiments 1 or 2, and the embodiment does not repeat the same.

[0100] Embodiment 4

[0101] As shown in Figure 5 and with reference to Figures 1-4In this embodiment, the horizontal circulating filter has the same structure as in Embodiment 3, except that multiple sets of filter units are arranged around the outer periphery of the coagulation zone 7. Optionally, the outer walls of multiple descending zones 34 form the coagulation zone 7. The wastewater inlet 11 on the main body 1 is connected to the inlet of the coagulation zone 7 by a pipe.

[0102] Both this embodiment and Embodiment 3 use external pressure backwashing, which can achieve the same beneficial effects as Embodiment 3. Therefore, this embodiment will not elaborate further.

[0103] Example 5

[0104] The horizontal circulating filter in this embodiment is the same as the rest of the structures in embodiments 1 to 4, except that the shape of the main body 1 can be as follows: Figures 1-5 The cube and cuboid shown can also be represented as follows: Figure 6 The cylinder shown in this embodiment does not limit the shape of the body 1.

[0105] Example 6

[0106] The horizontal circulation filter in this embodiment has the same structure as the rest of embodiments 1 to 6, except that, as Figure 7 As shown, the inlet of the coagulation zone 7 is set lower than the outlet of the coagulation zone 7, and the outlet of the coagulation zone 7 is set opposite to the upstream side of the horizontal sweeping layer 31, so that the sewage flowing through the coagulation zone 7 is released from the outlet at the top of the coagulation zone 7 and flows into the upstream side of the horizontal sweeping layer 31 to participate in filtration.

[0107] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A horizontal circulating filter, characterized in that, include: The main body (1) has a hollow internal structure and has a sewage inlet (11) and a clean water inlet (12); A filter assembly (2) is disposed within the main body (1) and is adapted to filter the flowing water. The filter assembly (2) is disposed upstream of the clear water outlet (12). The circulating filtration zone (3) is connected to the sewage inlet (11) and is located upstream of the filter assembly (2). The circulating filtration zone (3) includes at least a horizontal sweeping layer (31) in contact with the filter assembly (2). The water in the horizontal sweeping layer (31) has at least a horizontal tangential force when flowing through the filter assembly (2), which is suitable for flushing pollutants located at the upper part of the filter assembly (2) from the upstream side of the horizontal sweeping layer (31) along the top wall of the filter assembly (2) to the downstream side of the horizontal sweeping layer (31). Along the direction of water transport, the circulating filtration zone (3) also includes interconnected rising zone (32), slow-flow zone (33), and descending zone (34): The horizontal sweeping layer (31), rising region (32), slow-flow region (33) and falling region (34) are connected in sequence; The inlet of the circulating filtration zone (3) is located on the upstream side of the horizontal sweeping layer (31), and the incoming water can flow through the horizontal sweeping layer (31), the rising zone (32), the slow flow zone (33) and the descending zone (34) in sequence, so as to realize the circulation of the water in the circulating filtration zone (3), which is suitable for separating pollutants in the water.

2. The horizontal circulation filter according to claim 1, characterized in that, A flow guiding structure (4) is provided within the rising region (32), and the flow guiding structure (4) includes: A guide plate (41) is disposed in the rising zone (32) and forms a guide channel (411) between the rising zone (32) and the side wall of the rising zone (32), the guide channel (411) being adapted to guide the water upward.

3. The horizontal circulating filter according to any one of claims 1-2, characterized in that, The main body (1) also has a backwash water outlet (13), which is connected to the circulating filter zone (3). During backwashing, water can flow through the filter assembly (2) and the circulating filter zone (3) in sequence, and be discharged outside the main body (1) through the backwash water outlet (13).

4. The horizontal circulation filter according to claim 2, characterized in that, The flow guiding structure (4) also includes: A first sand-blocking plate (42) is connected to the bottom side of the guide plate (41), and the lower end of the first sand-blocking plate (42) extends toward the side wall of the body (1); and / or, the guide structure (4) further includes: The second sand baffle (43) is connected to the top side of the guide plate (41), and the top of the second sand baffle (43) extends toward the center of the body (1).

5. The horizontal circulating filter according to claim 4, characterized in that, Also includes: The clear water zone (5) is located downstream of the filter assembly (2) and is connected to the clear water outlet (12), and is suitable for collecting and discharging water filtered by the filter assembly (2).

6. The horizontal circulating filter according to claim 5, characterized in that, The clear water zone (5) includes: The first clear water zone (51) is suitable for collecting water filtered by the filter assembly (2); The second clear water zone (52) is located downstream of the first clear water zone (51) and is connected to both the first clear water zone (51) and the clear water outlet (12). The second clear water zone (52) is set higher than the circulating filtration zone (3). In the filtration state, the filtered water can pass through the first clear water zone (51) and the second clear water zone (52) and be discharged from the clear water outlet (12); in the backwash state, the water in the second clear water zone (52) is suitable to flow through the first clear water zone (51), the filter assembly (2) and the circulating filter zone (3) in sequence under its own gravity when the sewage inlet (11) and the clear water outlet (12) are closed, and is discharged from the backwash water outlet (13) to the outside of the main body (1).

7. The horizontal circulation filter according to claim 5, characterized in that, Also includes: A backwash water pipe (61) is installed in the clean water zone (5) and is correspondingly installed with the filter assembly (2), and is suitable for providing backwash water to the filter assembly (2).

8. The horizontal circulation filter according to claim 7, characterized in that, The circulating filtration zone (3) is provided in multiple ways. The multiple circulating filtration zones (3) are arranged in a ring shape within the body (1). The backwash water distribution pipe (61) is located in the center of the body (1) and is connected to the circulating filtration zone (3).

9. The horizontal circulating filter according to any one of claims 6-8, characterized in that, Also includes: The coagulation zone (7) is connected to the sewage inlet (11) and located upstream of the circulating filtration zone (3), and is suitable for coagulating the incoming water.

10. The horizontal circulating filter according to claim 9, characterized in that, Multiple baffles (71) are spaced apart on the side wall of the coagulation zone (7). The baffles (71) divide the coagulation zone (7) into multiple interconnected chambers. When the water flows through the coagulation zone (7), it can impact the baffles (71), which is suitable for mixing the water with the drug when adding drugs in the coagulation zone (7).

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