Large-flow multi-stage refined filtration dirt separator

Abstract

The utility model relates to the technical field of water supply filtering systems, in particular to a large-flow multi-stage refined filtration dirt separator. The water purifier comprises an equipment shell, a filtering component and a cleaning component, the filtering component is mounted in the equipment shell and arranged on a water flowing path, the filtering component comprises a first layer of rough filtration and a second layer of fine filtration, and the cleaning component is mounted at the filtering component and controls and cleans the filtering component. A three-stage graded filtering structure is adopted, circulating water firstly intercepts large-particle impurities through sedimentation and a coarse filter screen, the parallel layout of multiple filter elements remarkably reduces system resistance, high-flow stable operation is guaranteed, the filter elements are provided with a spiral brush automatic cleaning system, impurities attached to the surfaces of the filter elements can be removed in real time, the blockage problem is effectively avoided, the sewage discharging and flushing frequency is reduced, and the service life of the system is prolonged. A backwashing technology is integrated, and pores of the filter element are washed by reverse water flow, so that the impurity removal efficiency is further improved, and the service life of the filter element is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water supply filtration system especially relates to a large flow multistage fine filter dirt eliminator. BACKGROUND

[0002] In the field of heating system and industrial fluid treatment, pressure separation station as a key node needs to continuously treat suspended solids, particulate impurities and colloidal pollutants in large flow medium, and the traditional filter equipment is limited by flow rate, insufficient filtration efficiency and high maintenance cost, which has been difficult to meet the dual needs of modern system operation stability and economy.

[0003] The current traditional filtration technology has three major defects:

[0004] The traditional equipment generally uses single filter medium (such as quartz sand, anthracite) or single layer filter core structure, and relies on mechanical interception principle for impurity separation, such equipment has lower initial cost, but the filtration precision is limited, and it is difficult to effectively intercept fine particles and emulsified pollutants, resulting in the increase of fouling rate of subsequent heat exchange equipment;

[0005] For the high flow demand of industrial scene, the new large flow filter expands the filtration area to 2-3 times of the traditional equipment through optimizing the filter core structure (such as deep folding filter core or metal sintered mesh design), and reduces the pressure drop by 40%-60%, but because the multi-stage gradient filtration mechanism is not established, the first filter layer is easy to form through blocking when encountering sudden large particle impact, and the system efficiency decreases sharply;

[0006] The traditional backwashing process consumes 5%-8% of the system circulating water, and 20-40 cubic meters of wastewater is generated by single blowdown, which not only aggravates the waste of water resources, but also faces increasingly strict environmental emission restrictions. INVENTION CONTENTS

[0007] In order to solve the problems of low filtration efficiency and easy filtration blockage of the filtration equipment of the heating system, the utility model provides a large flow multistage fine filter dirt eliminator.

[0008] The large flow multistage fine filter dirt eliminator provided by the utility model adopts the following technical scheme:

[0009] A large flow multistage fine filter dirt eliminator comprises:

[0010] The equipment shell;

[0011] The filter member is installed in the equipment shell and is arranged on the water flow path, and the filter member comprises a first layer of coarse filter and a second layer of fine filter;

[0012] The cleaning member is installed at the filter member and controls the cleaning of the filter member.

[0013] By adopting the large-flow multi-stage fine filtration structure, suspended solids, particulate impurities and colloidal pollutants in the water body can be effectively removed. The coarse filter layer can first intercept larger particles, and the fine filter layer can further remove small particles and emulsified pollutants, thereby improving the filtration precision and ensuring the cleanliness of the water quality. The multi-stage filtration design can separate different particle sizes step by step, avoiding the problem of easy clogging of single-layer filter element structure, improving the impact resistance, especially when facing large particle impact, the filtration system can maintain stable working efficiency, avoiding the sharp decline of system efficiency. The filtration system is provided with a cleaning member, which can periodically clean the dirt on the filtration member, reducing the maintenance frequency of the filtration member. Compared with the traditional cleaning method, the service life of the filtration element can be effectively prolonged, the water source is saved, and the maintenance cycle and cost of the equipment are reduced. The device is particularly suitable for filtration requirements under large-flow and complex working conditions. When facing large particle impact, large flow or pollutant concentration changes, it can still provide reliable filtration performance to ensure stable operation of the system.

[0014] Further, the filtration member includes a coarse filter screen and a fine filter screen, the coarse filter screen and the fine filter screen are installed along the filtration path in sequence, and the coarse filter screen divides the interior of the device shell into a sedimentation zone and a fine filtration zone in sequence.

[0015] The filtration member includes a coarse filter screen and a fine filter screen, the coarse filter screen divides the interior of the device shell into a sedimentation zone and a fine filtration zone, and the fine filter screen further divides the fine filtration zone into a pre-filtration zone and a post-filtration zone. This multi-stage partition design effectively filters impurities of different particle sizes in stages, ensuring the filtration effect of each region, thereby significantly improving the overall filtration efficiency. The sedimentation zone can preliminarily precipitate larger particulate matter, reducing the burden on the subsequent filter screens. This can prolong the service life of the coarse filter screen and the fine filter screen, reduce the need for frequent maintenance, improve the working stability and economy of the system. Through the partition design, the cleaning member can maintain and clean the sedimentation zone, the pre-filtration zone and the post-filtration zone respectively. This not only improves the cleaning efficiency, but also allows local maintenance without affecting the overall system operation, further prolonging the service life of the device.

[0016] Further, the coarse filter screen is inverted conical, the fine filter screen is cylindrical and a plurality of fine filter screens are arranged in a circle, the fine filter screens are respectively installed and fixed by inner partition plates, and a water blocking ring is arranged between the fine filter screens and the inner partition plates.

[0017] The coarse filter screen is in an inverted conical structure, compared with the traditional plane or cylindrical coarse filter screen, the inverted conical design can more effectively guide the water flow and reduce the resistance of the water flow. After the water flow enters the inverted conical coarse filter screen, the water flow speed gradually slows down, which helps the precipitation of large-particle impurities, thereby improving the particle interception capacity of the coarse filter screen and reducing the burden of the subsequent filtration stage. The fine filter screen is in a cylindrical shape, and a plurality of fine filter screens are arranged around a circle, so that the water flow can uniformly pass through the plurality of fine filter screens, increasing the contact area between the water body and the fine filter screen and improving the filtration effect of the water flow. This arrangement design effectively improves the filtration efficiency of the fine filter screen, ensures efficient cleaning of the water quality, and the upper and lower fine filter screens are fixed by the inner partition plate. The design of the inner partition plate ensures the stability of the fine filter screen, avoiding displacement or damage of the fine filter screen during the filtration process due to water flow impact. At the same time, the water blocking ring arranged between the fine filter screen and the inner partition plate can effectively prevent excessive leakage of the water flow in the grid gap, thereby improving the filtration effect and the uniformity of the water flow. The arrangement of the water blocking ring avoids the disordered flow of the water flow, ensuring that the water body can be uniformly filtered when passing through each fine filter screen. The structural design between the fine filter screen and the inner partition plate optimizes the water flow path, so that the water flow can smoothly flow through each layer of fine filter screen, reducing the disturbance and unnecessary loss of the water flow. At the same time, reasonable water flow distribution ensures the balanced workload of each layer of fine filter screen, avoiding the decline of filtration performance caused by local blockage or uneven water flow.

[0018] Further, the upper and lower ends of the fine filter screen are respectively rotatably installed with an upper baffle and a lower baffle, the upper baffle is disc-shaped, a through hole is opened near the edge of the upper baffle, the through hole sequentially coincides with the upper opening of the circumferentially arranged fine filter screen during rotation around the center of the upper baffle, and the lower baffle is fan-shaped and rotates around the narrow center hole.

[0019] When a certain fine filter screen needs to be cleaned, the upper baffle can be rotated to align the corresponding through hole with the fine filter screen, so as to guide the cleaning water flow into the fine filter screen for cleaning. This design not only realizes precise cleaning of a single fine filter screen, but also improves the maintenance efficiency and working continuity of the system. The rotation of the upper baffle and the lower baffle makes the water inlet and outlet path of the entire filtration system flexible. When a certain fine filter screen needs to be cleaned, the through hole of the upper baffle is aligned with the fine filter screen, and the lower baffle blocks the water outlet path, realizing precise cleaning and reducing the energy consumption of the water pump, thereby reducing the operating cost of the entire system. Compared with traditional filtration equipment, this design improves the filtration effect while having better economy and environmental protection.

[0020] Further, the upper baffle and the lower baffle are connected with a main shaft at the rotation center, the main shaft is connected to a motor, and the motor drives the main shaft and the upper baffle and the lower baffle to rotate.

[0021] The motor drives the upper and lower baffles to rotate, which can accurately position the cleaning target and ensure that the cleaning water flow accurately enters the specified fine filter screen. The automatic control makes the cleaning process fast and efficient, reduces manual intervention, and improves the overall efficiency of the system.

[0022] Further, the cleaning member includes an upper blowdown port and a lower blowdown port, the upper blowdown port is arranged on the equipment shell and communicates with the pre-filtering area, the lower blowdown port is arranged on the equipment shell and communicates with the sedimentation area, the coarse filter screen is provided with an access opening on the side facing the sedimentation area, the access opening is arranged on the equipment shell and communicates with the sedimentation area, and a blocking plate is installed on the upper end of the access opening to control blocking.

[0023] The lower blowdown port directly communicates with the sedimentation area, which helps to concentrate the discharge of larger particles or sediments, reduces the interference with the fine filter screen, optimizes the hydraulic flow line and sediment flow path, the coarse filter screen is provided with an access opening on the side facing the sedimentation area, and is equipped with a blocking plate for control, which facilitates maintenance personnel to quickly access the key parts for cleaning, maintenance and replacement of parts.

[0024] Further, a brush is movably installed in the fine filter screen, the brush is installed in close contact with the side of the fine filter screen facing the pre-filtering area, a rotating shaft is arranged at the center of the brush and the brush rotates around the rotating shaft, a gear is installed at one end of the rotating shaft, a gear ring is connected in transmission through meshing with the gear, and the gear ring is installed on the upper baffle and rotates with the upper baffle under the drive of the motor.

[0025] The brush is installed on the fine filter screen and in close contact with the side of the fine filter screen facing the pre-filtering area, which can effectively brush off impurities and sediments on the surface of the filter screen, ensuring the continuous and efficient operation of the fine filter screen and avoiding blockage. The brush is driven by the central rotating shaft and rotates in linkage with the gear ring under the drive of the motor, realizing automatic cleaning of the fine filter screen without manual intervention. This automatic cleaning process greatly improves the intelligence and work efficiency of the system.

[0026] Further, the gear is a center hollow structure, and the brush is spiral-shaped and the upward spiral direction is opposite to the rotation direction of the brush.

[0027] The hollow structure helps liquid and impurities to pass through the center part of the gear, improves the drainage and blowdown capacity of the system, avoids the accumulation of impurities at the gear part, ensures the smooth and stable operation of the gear, and the brush is designed to be spiral-shaped and the upward spiral direction is opposite to the rotation direction of the brush, so that during rotation, the brush can effectively guide the impurities to the blowdown port direction, enhancing the cleaning efficiency and effect. The spiral design guides the impurities to move upward along the spiral path, reduces the possible backflow phenomenon of impurities during the cleaning process, ensures that the impurities are quickly transferred to the blowdown port, thereby improving the cleanliness and efficiency of the system.

[0028] Further, the water inlet is communicated with the sedimentation area, and the water outlet is communicated with the post-filtering area.

[0029] The water outlet flange provided at the end of the water outlet not only provides stable connection, avoids loosening or leakage of the water outlet, but also facilitates disassembly and cleaning of the equipment, thereby facilitating maintenance and inspection and reducing failure rate of the equipment in long-term use.

[0030] Further, the bottom of the equipment shell is provided with a supporting leg, and the top of the equipment shell is provided with a lifting ring.

[0031] In summary, the utility model has the beneficial technical effects as follows:

[0032] 1. Graded filtration design: a three-stage graded filtration structure is adopted, the circulating water first passes through a sedimentation and coarse filter screen to intercept large-particle impurities, and then enters a multi-filter core array for fine filtration; the multi-filter core parallel layout significantly reduces system resistance, and guarantees stable operation of high flow.

[0033] 2. Intelligent self-cleaning function: the filter core is provided with a spiral brush automatic cleaning system, which can remove impurities attached to the surface of the filter core in real time, effectively avoid clogging problems, reduce blowdown flushing frequency, and reduce water consumption.

[0034] 3. Optimization of backwashing technology: the backwashing technology is integrated, the filter core pores are flushed by reverse water flow, the impurity removal efficiency is further improved, and the service life of the filter core is prolonged.

[0035] 4. Full automation control: an electric control system is adopted to realize automatic adjustment of operation parameters and intelligent control of blowdown process, thereby greatly reducing the need for manual intervention. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a sectional view of the internal structure of the pollution removing device of the utility model;

[0037] Figure 2 It is a schematic view of the upper baffle structure of the utility model;

[0038] Figure 3 It is a schematic view of the gear ring gear meshing transmission of the utility model;

[0039] Figure 4 It is a schematic view of the lower baffle structure of the utility model;

[0040] Figure 5 It is a schematic view of the fine filter screen filtration process of the utility model;

[0041] Figure 6 It is a schematic view of the fine filter screen backwashing process of the utility model.

[0042] BRIEF DESCRIPTION OF DRAWINGS

[0043] 1, device shell, 11, water inlet, 111, water inlet flange, 12, water outlet, 121, water outlet flange, 13, leg, 14, lifting ring, 2, filter component, 21, coarse filter screen, 22, fine filter screen, 221, inner partition, 222, water blocking ring, 23, upper baffle, 231, through hole, 24, lower baffle, 3, cleaning component, 31, upper blowdown, 32, lower blowdown, 33, access hole, 331, plugging plate, 34, brush, 341, tooth ring, 342, gear, 343, rotating shaft, 41, motor, 42, main shaft. DETAILED DESCRIPTION

[0044] The specific embodiments of the present application will be described below with reference to the accompanying drawings. Figures 1-6 The technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only some of the embodiments of the present application, not all. 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.

[0045] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 do not indicate or imply that the device or element 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.

[0046] Embodiment 1

[0047] The embodiments of the present application disclose a large-flow multi-stage fine filtration and pollution removal device, which refers to Figure 1 , comprising:

[0048] Device shell 1

[0049] Filter component 2 is installed in the device shell 1 and is arranged on the water flow path, and the filter component 2 comprises a first layer of coarse filter and a second layer of fine filter.

[0050] Cleaning component 3 is installed at the filter component 2 and controls the cleaning of the filter component 2.

[0051] The raw water enters the equipment shell 1 through the water inlet, and the water flow first passes through the sedimentation area, where the larger particle impurities are deposited at the bottom due to gravity settling, and then enters the area where the filter member 2 is located, and the water flow first passes through the first layer of coarse filter, and the large particle impurities are blocked, and then enters the second layer of fine filter, and further removes small particle impurities and suspended solids, and the cleaned water after treatment is discharged from the water outlet and enters the subsequent system.

[0052] When the accumulated impurities on the surface of the filter layer reach a set value (by differential pressure detection or time control), the system automatically starts the cleaning program, the cleaning member 3 is started, the attached impurities are scraped off, the impurities are concentrated and discharged, and the self-cleaning process is completed.

[0053] Example 2:

[0054] Based on example 1, increase:

[0055] Referring to Figure 1 , Figure 5 and Figure 6 , the filter member 2 includes a coarse filter screen 21 and a fine filter screen 22, which are installed along the filter path in sequence, the coarse filter screen 21 divides the inside of the equipment shell 1 into a sedimentation area and a fine filter area in sequence, and the fine filter screen 22 divides the fine filter area inside the equipment shell 1 into a pre-filtering area and a post-filtering area.

[0056] Referring to Figure 1 , Figure 5 and Figure 6 , the coarse filter screen 21 is inverted conical, the fine filter screen 22 is cylindrical and a plurality of fine filter screens 22 are arranged around a circle, the fine filter screen 22 is installed and fixed by an inner partition plate 221 at the upper and lower ends respectively, and a water blocking ring 222 is arranged between the fine filter screen 22 and the inner partition plate 221.

[0057] Referring to Figure 1 , Figure 5 and Figure 6 , the upper and lower end faces of the fine filter screen 22 are respectively rotatably installed with an upper baffle 23 and a lower baffle 24, the upper baffle 23 is disc-shaped, a through hole 231 is formed in the edge of the upper baffle 23, and the through hole 231 is in turn coincided with the upper opening of the circumferentially arranged fine filter screen 22 during rotation around the center of the upper baffle 23, and the lower baffle 24 is fan-shaped and rotates around the narrow center hole.

[0058] Referring to Figure 1 , Figure 5 and Figure 6 , the rotation centers of the upper baffle 23 and the lower baffle 24 are connected with a main shaft 42, the main shaft 42 is connected to a motor 41, and the motor 41 drives the main shaft 42 and rotates the upper baffle 23 and the lower baffle 24.

[0059] The raw water enters the equipment shell 1 through the water inlet, first enters the sedimentation area, and the large-particle impurities are deposited at the bottom of the sedimentation area due to gravity settling. The water flow enters the filter member 2, first passes through the coarse filter screen 21 to remove large-particle impurities, and then enters the fine filtration area to pass through multiple fine filter screens 22 to finely remove small-particle impurities. The water flow enters the post-filtration area through the fine filter screen and is discharged from the water outlet.

[0060] Primary sedimentation: After the circulating water enters the inside of the equipment shell 1 through the water inlet 11, it first flows into the sedimentation area. The sedimentation area is an expansion chamber. Due to the sudden decrease in flow rate, impurities with a higher specific gravity in the water (such as sand and metal particles) settle to the bottom under the action of gravity and are periodically discharged through the lower blowdown port 32.

[0061] Large-particle interception: The remaining lighter impurities rise with the water flow and, when passing through the coarse filter screen 21, the special structure of the coarse filter screen 21 intercepts and diverts the suspended matter with a larger particle size to the upper two sides of the filter screen. After shutdown, manual cleaning can be performed through the access opening 33.

[0062] Fine filtration: Referring to Figure 1 , the arrows in the figure represent the direction of the water flow. The small impurities that are not intercepted continue to move upward with the water flow, pass through multiple groups of parallel arranged fine filter screens 22 for filtration, and the finally purified water is output from the water outlet 12.

[0063] Example 3:

[0064] Based on example 2, the following is added:

[0065] Referring to Figure 2 , the cleaning member 3 includes an upper blowdown port 31 and a lower blowdown port 32. The upper blowdown port 31 is arranged on the equipment shell 1 and communicates with the pre-filtration area. The lower blowdown port 32 is arranged on the equipment shell 1 and communicates with the sedimentation area. The coarse filter screen 21 is provided with an access opening 33 on the side facing the sedimentation area. The access opening 33 is arranged on the equipment shell 1 and communicates with the sedimentation area. A blocking plate 331 is installed at the upper end of the access opening 33 to control blocking.

[0066] Referring to Figure 4 , Figure 5 and Figure 1 , the fine filter screen 22 movably installs a brush 34. The brush 34 is installed by rolling against the side of the fine filter screen 22 facing the pre-filtration area. The brush 34 is provided with a rotating shaft 343 at the center and rotates around the rotating shaft 343. One end of the rotating shaft 343 is provided with a gear 342. The gear 342 is in meshing transmission connection with a gear ring 341. The gear ring 341 is installed on the upper baffle plate 23 and rotates with the upper baffle plate 23 under the drive of the motor 41.

[0067] Referring to Figure 1 , Figure 5 , Figure 6 andFigure 2 The gear 342 is a center hollow structure, and the brush 34 is helical and spirals upward in a direction opposite to the rotation direction of the brush 34.

[0068] Referring to Figure 3 The device shell 1 is provided with a water inlet 11 and a water outlet 12, the water inlet 11 communicates with the sedimentation area, the water outlet 12 communicates with the post-filtering area, the end of the water inlet 11 is provided with a water inlet flange 111, and the end of the water outlet 12 is provided with a water outlet flange 121.

[0069] Referring to Figure 5 The device shell 1 is provided with a water inlet 11 and a water outlet 12, the water inlet 11 communicates with the sedimentation area, the water outlet 12 communicates with the post-filtering area, the end of the water inlet 11 is provided with a water inlet flange 111, and the end of the water outlet 12 is provided with a water outlet flange 121.

[0070] Mechanical cleaning: the main shaft 42 is rigidly connected with the upper baffle 23 and the lower baffle 24, the through hole 231 is angle coincident with the lower baffle 24, the motor 41 is connected with a speed reducer and further connected with the driving main shaft 42 to rotate, synchronously driving the upper baffle 23, the lower baffle 24 and the gear 352 to rotate, the gear 352 drives the helical brush 34 to brush the surface of the fine filter screen 22 in a circumferential direction, peels off the attached impurities and pushes them to the top temporary storage area.

[0071] Hydraulic backwashing: referring to Figure 6 Figure 1 Figure 1 Figure 6 The arrow in the figure is the water flow direction, when the through hole 231 of the upper baffle 23 rotates to the position aligned with the fine filter screen 22, the lower baffle 24 simultaneously closes the water inlet of the fine filter screen 22, the dirt separator switches to the reverse flushing mode, the clean water penetrates the filter material from the outside of the fine filter screen 22 in a reverse direction, carries the temporarily stored impurities into the dirt discharging channel through the through hole 231, and finally is discharged out of the equipment through the upper dirt discharging port 31.

[0072] The above is only an example and description of the structure of the utility model, and those skilled in the art can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as the modifications or supplements or replacements do not deviate from the structure of the utility model or exceed the range defined by the present application, and should belong to the protection range of the utility model.

Claims

1. A large flow multi-stage fine filter dirt separator, characterized by, The utility model relates to a water purifier, including: Device shell (1); Filtering component (2) is installed in device shell (1) and is arranged on water body flow path, the filtering component (2) includes first layer coarse filter and second layer fine filter; Cleaning component (3) is installed at filtering component (2) and controls cleaning filtering component (2).

2. A large flow multi-stage fine filter dirt separator according to claim 1, characterized in that: The filtering component (2) includes coarse filter screen (21) and fine filter screen (22), the coarse filter screen (21) and fine filter screen (22) are installed in turn along the filtering path, the coarse filter screen (21) divides the inside of device shell (1) into sedimentation zone and fine filter zone in turn, the fine filter screen (22) divides the fine filter zone in the inside of device shell (1) into pre-filtering area and post-filtering area.

3. A large flow multi-stage fine filter dirt separator according to claim 2, characterized in that: The coarse filter screen (21) is inverted conical, the fine filter screen (22) is cylindrical and multiple fine filter screens (22) are arranged around a circle, the fine filter screen (22) is installed and fixed through inner partition (221) respectively on the upper and lower sides, and water blocking ring (222) is arranged between the fine filter screen (22) and inner partition (221).

4. A large flow multi-stage fine filter dirt separator according to claim 3, characterized in that: The upper and lower end surfaces of the fine filter screen (22) are respectively rotatably installed with upper baffle (23) and lower baffle (24), the upper baffle (23) is disc-shaped, a through hole (231) is formed in the vicinity of the edge of the upper baffle (23), the through hole (231) is in turn coincided with the upper openings of the circumferentially arranged fine filter screens (22) during rotation around the center of the upper baffle (23), and the lower baffle (24) is fan-shaped and rotates around the narrow center hole.

5. A large flow multi-stage fine filter dirt separator according to claim 4, characterized in that: The rotation centers of the upper baffle (23) and the lower baffle (24) are connected with a main shaft (42), the main shaft (42) is connected to a motor (41), the motor (41) drives the main shaft (42) and rotates the upper baffle (23) and the lower baffle (24).

6. A large flow multi-stage fine filter dirt separator according to claim 2, wherein: The cleaning component (3) includes an upper blowdown port (31) and a lower blowdown port (32), the upper blowdown port (31) is arranged on the device shell (1) and communicates with the pre-filtering area, the lower blowdown port (32) is arranged on the device shell (1) and communicates with the sedimentation zone, the coarse filter screen (21) is provided with an access opening (33) on the side facing the sedimentation zone, the access opening (33) is arranged on the device shell (1) and communicates with the sedimentation zone, and a blocking plate (331) is installed on the upper end of the access opening (33) to control blocking.

7. A large flow multi-stage fine filter dirt separator as defined in claim 2 wherein: A brush (34) is movably installed in the fine filter screen (22), the brush (34) is tightly rolled against the fine filter screen (22) on the side facing the pre-filtering area, a rotating shaft (343) is arranged at the center of the brush (34) and rotates around the rotating shaft (343), a gear (342) is installed at one end of the rotating shaft (343), a gear ring (341) is drivingly connected by meshing with the gear (342), and the gear ring (341) is installed on the upper baffle (23) and rotates with the upper baffle (23) under the driving of the motor (41).

8. A large flow multi-stage fine filter dirt separator according to claim 7, characterized in that: The gear (342) is a hollow structure at the center, the brush (34) is spiral-shaped, and the upward spiral direction is opposite to the rotating direction of the brush (34).

9. A large flow multi-stage fine filter dirt separator according to claim 2, wherein: The water inlet (11) is communicated with the sedimentation area, and the water outlet (12) is communicated with the post-filtration area.

10. A large flow multi-stage fine filter dirt separator according to claim 9, wherein: The equipment shell (1) is provided with a supporting leg (13) at the bottom and a lifting ring (14) at the top.

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