Variable speed filtration device

Abstract

The application discloses a variable-speed filter device, which comprises a filter tank body, a water distribution plate arranged horizontally in the filter tank body, a water collecting area below the water distribution plate, a water inlet baffle and a backwashing baffle arranged vertically from the upper portion of the water distribution plate to the top of the filter tank body, a double-ring type variable-speed water distributor arranged between the water inlet baffle and the backwashing baffle, a graded pad layer arranged above the water distribution plate between the water inlet baffle and the backwashing baffle, and graded filter material arranged in the graded pad layer; a water inlet is arranged on the upper portion of one side of the filter tank body, a backwashing side flushing port is arranged on the backwashing baffle; a water inlet electric adjusting mechanism is arranged at the water inlet and used for controlling water inlet and reverse side flushing. The variable-speed filter device is more reasonable in design of filter water inlet and backwashing filter speed, more stable in water outlet, and better in cleaning and backwashing effect.

Description

Technical Field

[0001] This invention relates to a cleaning and filtration device, belonging to the field of water treatment pretreatment technology. Background Technology

[0002] Currently, there are various types of wastewater filtration equipment on the market, most of which adopt vertical filtration devices. They are generally vertical cylindrical shapes with a large height-to-diameter ratio. Incoming water passes through the filter filled with filter media from top to bottom, and the produced water is collected through the water collection hole at the bottom of the filter. This type of wastewater treatment device has the following disadvantages: 1) The equipment is too tall, making maintenance of each device difficult; 2) The equipment has a small filtration area, resulting in a small processing capacity of a single device; 3) The equipment has an unstable filtration rate, resulting in large fluctuations in the quality of the effluent, which is not conducive to subsequent equipment treatment; 4) The equipment is not thoroughly backwashed, which leads to the filter media easily caking after use and a decline in the quality of the produced water. Summary of the Invention

[0003] The technical problem to be solved by this invention is that incomplete backwashing of general filters leads to a decline in the quality of produced water and the problem of filter media caking.

[0004] To address the aforementioned problems, this invention provides a variable-speed filtration device, comprising a filter tank, a water distribution plate horizontally arranged inside the filter tank, a water collection area below the water distribution plate, an inlet baffle and a backwash baffle vertically arranged above the water distribution plate and to the top of the filter tank, a double-ring variable-speed water distributor arranged between the inlet baffle and the backwash baffle, a graded pad layer arranged between the inlet baffle and the backwash baffle and above the water distribution plate, and graded filter media arranged on the graded pad layer; an inlet is provided on the upper part of one side of the filter tank, and a backwash side flushing port is provided on the backwash baffle; an electric inlet regulating mechanism is provided at the inlet, during forward filtration, the electric inlet regulating mechanism controls the position of a sliding sealing valve plate one to allow water to enter the double-ring variable-speed water distributor; during reverse flushing, the electric inlet regulating mechanism controls the position of a sliding sealing valve plate two to control the backwash side flushing water to enter the graded filter media arranged through the backwash side flushing port;

[0005] A water outlet is provided on one side of the lower part of the filter tank, and a backwash water outlet is provided at the bottom of the filter tank. The backwash water outlet is connected to the water distributor.

[0006] In the aforementioned variable speed filtration device, the filter tank is connected and fixed to the equipment foundation via a filter tank support.

[0007] The aforementioned variable speed filtration device includes an inlet electric adjustment mechanism comprising an inlet electric actuator fixed to the filter tank. Two sliding sealing valve plates, a first sliding sealing valve plate and a second sliding sealing valve plate, are parallel valve plates, both fixed to a valve stem. The electric actuator controls the raising and lowering of the first and second sliding sealing valve plates via the valve stem. Guide grooves one and two are fixed to the inlet baffle. When the first and second sliding sealing valve plates rise, guide groove one fixes the switching trajectory of the first sliding sealing valve plate, and guide groove two fixes the switching trajectory of the second sliding sealing valve plate, preventing the valve plates from deviating from their orientation. During forward filtration, the valve stem rises, opening the closed inlet port of the first sliding sealing valve plate. During backwashing, the valve stem descends, closing the inlet port of the first sliding sealing valve plate and opening the backwash side flushing port.

[0008] The aforementioned variable speed filtration device has a grid screen installed at the backwash side flushing port.

[0009] The aforementioned variable speed filtration device includes a dual-ring variable speed water distributor comprising an outer ring water distributor and an inner ring water distributor. The outer ring water distributor has sealed pipes at both ends and a wire-wound pipe in the middle. The opening and closing of the water inlet of the dual-ring variable speed water distributor is controlled by the lifting and lowering of a sliding sealing valve plate. One end of the outer ring water distributor is fixed to the water inlet baffle, and the other end is fixed to the backwash baffle. The inner ring water distributor is fixed to the push screw via a connecting rod. One end of the push screw is connected to the backwash electric actuator, and the other end is connected to the sealed pipe at the water inlet end of the outer ring water distributor via a fixing device. The push screw and the fixing device are connected by threads.

[0010] The aforementioned variable speed filtration device includes graded filter media comprising quartz sand and anthracite, wherein the effective particle size of the quartz sand is 0.9-1.0 mm and the effective particle size of the anthracite is 1.0-2.0 mm; the height ratio of quartz sand to anthracite is 5:3.

[0011] The aforementioned variable speed filtration device includes a variable speed adjusting water cap comprising an adjusting screw. The adjusting screw clamps and fixes the fixed base and the lower part of the filter screen onto the water distribution holes of the water distribution plate. Each water distribution hole on the water distribution plate corresponds to a variable speed adjusting water cap. A fixing nut cooperates with the adjusting screw, and tightening the nut secures the entire variable speed adjusting water cap to the water distribution plate. The lower part of the fixing screw is the adjusting water cap body, which includes a floating filter umbrella. A filter screen is provided on the upper part of the floating filter umbrella, and a top cover is provided on the upper part of the filter screen.

[0012] In the aforementioned variable speed filtration device, the filter mesh is made of a wound tube with a filtration accuracy of 0.25mm, and the floating filter umbrella is an umbrella-shaped filter plate connected to the center of an adjusting screw.

[0013] In the aforementioned variable speed filtration device, the water distribution plate adopts diamond-shaped water distribution holes, and the four diagonally opposite water distribution holes are arranged in a diamond shape, with the center distance of each adjacent diagonally opposite water distribution hole being the same.

[0014] The aforementioned variable speed filtration device includes a water distributor comprising a main water distributor pipe, a branch water distributor pipe, a water distribution hole, and a fixing component. The main water distributor pipe and the branch water distributor pipe are fixed to the filter tank by the fixing component, and the main water distributor pipe is connected to the backwash water port.

[0015] The beneficial effects achieved by the present invention are as follows: The variable speed filtration device of the present invention, through the design of the backwashing port on the inlet and the backwash process, makes the filter media more thoroughly rinsed, the pollutants in the filter media are more thoroughly flushed, the filter media is not easy to clump, and the treatment effect is long-lasting.

[0016] The variable speed filtration device of the present invention, through the variable speed adjustment water cap, has a small flow area during filtration, resulting in a more stable filtration speed and reducing the impact of inlet water pressure. During backwashing, the flow area is large, increasing the filtration speed and making backwashing more thorough. The diamond-shaped water distribution method makes the water distribution more uniform. By moving the inner ring water distributor in the double-ring variable speed water distributor, the flow area of ​​inlet water and backwashing is adjusted, which is more conducive to the discharge of backwash pollutants and the stability of inlet water distribution. Attached Figure Description

[0017] Figure 1 This is a front view of the structure of a variable speed filtration device in Example 1;

[0018] Figure 2 This is a schematic diagram of the left side of a variable speed filtering device structure in Example 1;

[0019] Figure 3 This is a front cross-sectional view of a variable speed filtering device structure in Example 1;

[0020] Figure 4 This is a schematic cross-sectional view of the left side of a variable speed filtering device structure in Example 2;

[0021] Figure 5 This is a schematic diagram of the variable speed adjustment water cap structure of a variable speed filtration device in Example 5;

[0022] Figure 6 This is a schematic diagram of a water distributor for a variable speed filtration device in Example 4;

[0023] Figure 7 This is a schematic diagram of a double-ring variable speed water distributor structure for a variable speed filtration device in Example 3;

[0024] Figure 8 This is a schematic diagram of the water distribution plate structure of a variable speed filtration device in one embodiment;

[0025] Figure 9 A trend diagram showing the time effect on sand filter media with different particle sizes;

[0026] Figure 10 This is a trend graph showing the relationship between water production pressure and time.

[0027] Attached Figure Descriptions: 1-Filter tank; 2-Inlet electric regulating mechanism; 021-Inlet electric actuator; 022-Valve stem; 023-Sliding sealing valve plate one; 024-Sliding sealing valve plate two; 025-Guide groove one; 026-Guide groove two; 3-Filter tank support; 4-Double-ring variable speed water distributor; 041-Outer ring water distributor; 042-Inner ring water distributor; 043-Propeller screw; 044-Connecting rod; 045-Fixing device; 046-Backwash electric actuator; 5-Graded filter media; 6-Variable speed regulating water cap; 0 61-Fixing bolt, 062-Top cover, 063-Filter mesh, 064-Floating filter umbrella, 065-Adjusting screw, 066-Fixing base, 7-Water distribution plate, 071-Water distribution hole, 8-Water distributor, 081-Water distributor main pipe, 082-Water distributor branch pipe, 083-Water distribution hole, 9-Inlet baffle, 10-Backwash baffle, 11-Graded filter media loading and unloading port, 12-Exhaust port, 13-Inlet, 14-Backwash water port, 15-Outlet, 16-Drainage port, 17-Graded pad, 18-Backwash side flushing port. Detailed Implementation

[0028] To illustrate the present invention more clearly, the accompanying drawings used in the embodiments or descriptions of the prior art will be briefly introduced below.

[0029] Example 1

[0030] like Figures 1 to 3 As shown, this embodiment provides a variable speed filtration device, including a filter tank 1. A water distribution plate 7 is horizontally arranged inside the filter tank 1, with a water collection area below the water distribution plate 7. An inlet baffle 9 and a backwash baffle 10 are vertically arranged from the upper part of the water distribution plate 7 to the top of the filter tank 1. A double-ring variable speed water distributor 4 is arranged between the inlet baffle 9 and the backwash baffle 10. A graded pad layer 17 is arranged between the inlet baffle 9 and the backwash baffle 10 and above the water distribution plate 7. A graded pad layer 17 is arranged on the graded pad layer 17. Graded filter media 5; an inlet is provided on the upper part of one side of the filter tank 1, and a backwash side flushing port 18 is provided on the backwash baffle 10; an electric inlet regulating mechanism 2 is provided at the inlet. During forward filtration, the electric inlet regulating mechanism 2 controls the position of the sliding sealing valve plate 1 to allow water to enter the double-ring variable speed water distributor 4; during reverse flushing, the electric inlet regulating mechanism 2 controls the position of the sliding sealing valve plate 2 to control the backwash side flushing water to enter the graded filter media 5 through the backwash side flushing port 18.

[0031] A water outlet 15 is provided on one side of the lower part of the filter tank 1, and a backwash water outlet 14 is provided at the bottom of the filter tank 1. The backwash water outlet 14 is connected to the water distributor 8.

[0032] like Figure 2As shown, the entire filter is supported by the support and body of all components, which supports the inlet electric regulating mechanism 2, filter tank support 3, double-ring variable speed water distributor 4, graded filter media 5, variable speed regulating water cap 6, water distribution plate 7, water distributor 8, inlet baffle 9, backwash baffle 10, graded pad layer 17, and other components. The filter tank 1 is directly connected to the filter tank support 3, and the filter tank 1 is connected and fixed to the equipment foundation through the filter tank support 3.

[0033] Example 2

[0034] Based on Example 1, such as Figure 4 As shown, the water inlet electric regulating mechanism 2 includes a water inlet electric actuator 021, a valve stem 022, a sliding sealing valve plate one 023, a sliding sealing valve plate two 024, a guide groove one 025, and a guide groove two 026. The electric actuator 021 is fixed to the filter tank 1. The sliding sealing valve plate one 023 and the sliding sealing valve plate two 024 are two parallel valve plates, both fixed to the valve stem 022. The electric actuator 021 controls the raising and lowering of the sliding sealing valve plate one 023 and the sliding sealing valve plate two 024 through the valve stem 022. The guide groove one 025 and the guide groove two 026 are fixed to the water inlet baffle 9. When the sliding sealing valve plate one 023 and the sliding sealing valve plate two 024 rise, the guide groove one 025 fixes the switching trajectory of the sliding sealing valve plate one 023. The guide groove 2026 fixes the switching trajectory of the sliding sealing valve plate 2024, ensuring that the valve plate does not deviate from its direction. During forward filtration, the valve stem 022 rises, the water inlet hole closed by the sliding sealing valve plate 1023 opens, and the sliding sealing valve plate 2024 closes the backwash side flushing port 18. Water enters the double-ring variable speed water distributor 4 through the water inlet hole. During backwashing, the valve stem 022 descends, the water inlet hole is closed by the sliding sealing valve plate 1023, and the backwash side flushing port 18 opens, starting side flushing. The backwash side flushing port 18 is equipped with a grid screen to prevent filter media loss.

[0035] Example 3

[0036] Based on Example 1, such as Figure 7 As shown, Figure 7 Figures (a), (b), and (c) respectively represent the front view of the wire-wound pipe, the cross-sectional view of the wire-wound pipe push screw and connecting rod, and the cross-sectional view of the end of the wire-wound pipe push screw and the fixing device. The double-ring variable speed water distributor 4 includes an outer ring water distributor 041, an inner ring water distributor 042, a push screw 043, a connecting rod 044, a fixing device 045, and a backwash electric actuator 046. Figure 3As shown in the double-ring variable speed water distributor 4, the outer ring water distributor 041 has sealed pipes at both ends and a wire-wound pipe in the middle. The opening and closing of the water inlet of the double-ring variable speed water distributor 4 is controlled by the lifting and lowering of the sliding sealing valve plate 023. One end of the outer ring water distributor 041 is fixed to the water inlet baffle 9, and the other end is fixed to the backwash baffle 10. The inner ring water distributor 042 is fixed to the push screw 043 through the connecting rod 044. One end of the push screw 043 is connected to the backwash electric actuator 046, and the other end is connected to the outer ring water distributor through the fixing device 045. On the sealed pipe at the inlet end of the filter 041, the push screw 043 and the fixing device 045 are connected by threads. During filtration, the inner ring water distributor 042 and the outer ring water distributor 041 are arranged alternately, with a small flow area and small filter pores, which perform preliminary filtration of the inlet water. During backwashing, the backwash electric actuator 046 drives the push screw 043 to move along the water inlet direction, thereby driving the projections of the inner ring water distributor 042 and the outer ring water distributor 041 to coincide in the water inlet direction, increasing the flow area and the filter pores, and facilitating the passage of pollutants generated during backwashing.

[0037] Example 4

[0038] Based on Example 1, the graded filter media 5 mainly includes quartz sand and anthracite. It uses quartz sand with an effective particle size of 0.9-1.0 mm and anthracite with an effective particle size of 1.0-2.0 mm, combined with a total height of 800 mm and a height ratio of quartz sand: anthracite = 5:3. This combination can adsorb most of the suspended solids and most of the organic pollutants in the sewage. The organic pollutants are partially adsorbed on the surface of the anthracite, while the suspended solids are trapped in the pores of the quartz sand. The pollutants are discharged with the backwash water after backwashing.

[0039] Example 5

[0040] Based on Example 1, such as Figure 5 As shown, the variable speed regulating water cap 6 includes a fixing nut 061, a top cover 062, a filter screen 063, a floating filter umbrella 064, an adjusting screw 065, and a fixing base 066. The adjusting screw 065 clamps and fixes the fixing base 066 and the lower part of the filter screen 063 to the water distribution hole 071 of the water distribution plate 7. Each water distribution hole 071 on the water distribution plate 7 corresponds to one variable speed regulating water cap 6. The fixing nut 061 cooperates with the adjusting screw 065, and by tightening the fixing nut 061, the entire variable speed regulating water cap 6 is fastened to the water distribution plate 7. The lower part of the fixing screw 061 is the regulating water cap body, which includes a floating filter umbrella 064. A filter screen 063 is provided on the upper part of the floating filter umbrella 064, and the top cover 062 is on the upper part of the filter screen 063.

[0041] The variable speed regulating water cap 6 is fixed to the water distribution plate 7 by fixing bolts 061, adjusting screws 065 and fixing base 066. The filter mesh 063 is made of wound wire tube with a filtration accuracy of 0.25mm. The floating filter umbrella 064 is an umbrella-shaped filter plate, which is centrally connected to the adjusting screw 065 and can slide up and down. During filtration, the floating filter umbrella 064 sinks to the water distribution hole 071 under the action of gravity. The water flows through the filter gaps of the floating filter umbrella 064, the flow area becomes smaller, the filtration speed becomes more stable, and the water quality after filtration is stable. During backwashing, the floating filter umbrella 064 floats to the top under the push of the backwash water, the backwash flow area becomes larger, and the backwashing effect is better.

[0042] The water distribution plate 7 uses diamond-shaped water distribution holes. The four diagonally opposite water distribution holes are arranged in a diamond shape, and the center distance between each adjacent diagonally opposite water distribution hole is the same, making the water distribution more uniform and stable.

[0043] Example 4

[0044] Based on Example 1, such as Figure 6 As shown, the water distributor 8 includes a main water distributor pipe 081, a branch water distributor pipe 082, a water distribution hole 083, and a fixing component. The main water distributor pipe 081 and the branch water distributor pipe 082 are fixed to the filter tank 1 by the fixing component. The main water distributor pipe 081 is connected to the backwash water inlet 14. The backwash water flows through the main water distributor pipe 081 to the branch water distributor pipe 082, and the final water volume is distributed by the water distribution hole 083. The water distribution hole 083 is evenly distributed in the water collection area and is used for the primary distribution of backwash water.

[0045] like Figure 3 As shown, in the filtration stage, incoming water enters the filter through inlet 13 and enters the graded filter media 5 under the primary distribution of the dual-ring variable speed water distributor 4. The graded filter media 5 adsorbs most of the suspended solids and most of the organic pollutants in the sewage. The adsorbed clean water passes through the floating filter umbrella 064 in the variable speed regulating water cap 6, and after stabilizing the filtration speed, it enters the water collection area and is then discharged through outlet 15.

[0046] During the backwashing stage, the electric regulating mechanism 2 drives the valve stem 022 to descend, closing the inlet side and opening the backwash side flushing port 18 to begin side flushing. The backwash water enters the filter through the backwash water port 14 and is initially distributed by the water distributor 8. The backwash water in the collection area enters the variable speed regulating water cap 6 for secondary wastewater distribution. The floating filter umbrella 064 in the variable speed regulating water cap 6 floats to the top, increasing the backwash flow area and entering the graded filter media 5 to flush the adsorbed pollutants. The electric actuator 046 drives the propulsion screw 043 to move along the inlet direction, thereby causing the inner ring water distributor 042 and the outer ring water distributor 041 to coincide in the inlet direction. This increases the flow area and the filter pores, facilitating the passage of pollutants generated during backwashing. Finally, the backwash water is discharged through the drain port 16.

[0047] The variable speed filtration device described in the above embodiments can solve problems such as high difficulty in equipment maintenance and operation, low equipment processing capacity, unstable filtration rate, unstable effluent quality, and easy caking of filter media. Through graded filter media, most of the suspended solids and most of the organic pollutants in the sewage can be adsorbed. Some of the organic pollutants are adsorbed on the surface of anthracite, while the suspended solids are trapped in the pores of quartz sand. The produced water meets the standards and enters the subsequent process system. The pollutants are discharged with the backwash water after backwashing.

[0048] The variable speed filtration device of this embodiment is described below using experimental data. This experiment was conducted at a water plant site, with influent from an inclined plate sedimentation tank and effluent from the filter. The process was as follows: inclined plate sedimentation effluent → influent pump → filter → product water.

[0049] The testing instruments include:

[0050]

[0051] Test apparatus parameters: The test apparatus uses two sets of parallel filters as the test objects, with a filter diameter of 500mm and a height of 1.5m. Each filter column is equipped with a filter plate + variable speed filter cap, and the padding layer filling height is 75mm.

[0052] Configuration parameters Variable speed filter cap specifications: 0.25mm filter mesh. Test parameters Filtration rate: 10m / h Run termination conditions Turbidity > 2 NTU or pressure loss reaches 2.2 m

[0053] Experimental parameter design:

[0054]

[0055]

[0056] In the AE test, a filter cap with a 0.25mm filter gap was used. After each filter media replacement, the filter media had to be backwashed before being put into the next test.

[0057] Table 1 Summary of Test Results

[0058]

[0059] Analysis of the impact of filter media configuration on working time: Table 1 and Figure 9 It can be seen that the working time performance of sand filter media with different particle sizes combined with anthracite varies. The test results show that there are two working conditions that meet the requirement of a working cycle of >12 hours: Condition C and Condition D. The main filter media is 0.9-1.0mm quartz sand. The conditions of filter media with different particle sizes are described below:

[0060] When using 0.5-0.6mm quartz sand filter media, the working time of condition A (single layer of 0.5-0.6mm quartz sand filter media) is the shortest. After the operation of condition A is completed, a thin layer of mud film can be observed on the surface of the filter media. The main filtration mode of this filter media is shallow filtration. Therefore, although the filter layer height L = 800mm, most of the filter layer cannot participate in the operation.

[0061] Combining the data in Table 1 and Figure 10 The time effect trend chart shows that working condition A (single layer of 0.5-0.6mm sand filter media) belongs to shallow filtration. Although the filter layer height L = 800mm, the actual filter layer involved in the work is limited. Therefore, when working condition B (double layer filter media, replacing part of the sand with anthracite) is used, the anthracite has a certain working capacity for holding pollutants. The addition of anthracite increases the effective working layer height, resulting in a longer working cycle.

[0062] When using 0.9-1.0mm quartz sand filter media, the working conditions differ from those of fine sand (0.5-0.6mm). As the height of the anthracite replacing the sand layer increases (working condition CDE), the working time shows a decreasing trend. This is because the 0.9-1.0mm sand filter mode is deep filtration. The existing water quality is good, the influent turbidity is low, and the particle size of the components is small. Therefore, the performance of anthracite is similar to that of 0.9-1.0mm sand. Moreover, because the particle size of the turbidity components in the influent is small, more of them can migrate to the lower sand layer. Therefore, when more sand is replaced by coal, i.e., when there is less sand, the apparent overall dirt-holding capacity for the existing water quality decreases. The filter layer is not thoroughly backwashed or cleaned, and the effective working capacity is not fully released.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope. Although the present invention has been described in detail through the above preferred examples, those skilled in the art should understand that equivalent modifications and substitutions can be made in the details without departing from the scope defined by the claims of the present invention.

Claims

1. A variable speed filtration device, comprising a filter tank (1), characterized in that, A water distribution plate (7) is horizontally arranged inside the filter tank (1). The area below the water distribution plate (7) is the water collection area. An inlet baffle (9) and a backwash baffle (10) are vertically arranged from the upper part of the water distribution plate (7) to the top of the filter tank (1). A double-ring variable speed water distributor (4) is arranged between the inlet baffle (9) and the backwash baffle (10). A graded pad layer (17) is arranged between the inlet baffle (9) and the backwash baffle (10) and above the water distribution plate (7). Graded filter media (5) is arranged on the graded pad layer (17). A water inlet is provided on the upper part of one side of the filter tank (1), and a backwash side flushing port (18) is provided on the backwash baffle (10); an electric water inlet regulating mechanism (2) is provided at the water inlet. During forward filtration, the electric water inlet regulating mechanism (2) controls the position of the sliding sealing valve plate one to allow water to enter the double-ring variable speed water distributor (4); during reverse flushing, the electric water inlet regulating mechanism (2) controls the position of the sliding sealing valve plate two to control the backwash side flushing water to enter the arranged graded filter media (5) through the backwash side flushing port (18); A water outlet (15) is provided on one side of the lower part of the filter tank (1), and a backwash water outlet (14) is provided at the bottom of the filter tank (1). The backwash water outlet (14) is connected to the water distributor (8). The double-ring variable speed water distributor (4) includes an outer ring water distributor (041) and an inner ring water distributor (042). The outer ring water distributor (041) has sealed pipes at both ends and a wire-wound pipe in the middle. The opening and closing of the water inlet of the double-ring variable speed water distributor (4) is controlled by the lifting and lowering of the sliding sealing valve plate (023). One end of the outer ring water distributor (041) is fixed to the water inlet baffle (9) and the other end is fixed to the backwash baffle (10). The inner ring water distributor (042) is fixed to the push screw (043) through the connecting rod (044). One end of the push screw (043) is connected to the backwash electric actuator (046), and the other end is connected to the sealed pipe at the water inlet end of the outer ring water distributor (041) through the fixing device (045). The push screw (043) and the fixing device (045) are connected by threads.

2. The variable speed filtration device according to claim 1, characterized in that, The filter tank (1) is connected and fixed to the equipment foundation through the filter tank support (3).

3. The variable speed filtration device according to claim 1, characterized in that, The electric regulating mechanism (2) for water inlet includes an electric actuator (021), which is fixed on the filter tank (1). The sliding sealing valve plate one (023) and the sliding sealing valve plate two (024) are two parallel valve plates, both fixed on the valve stem (022). The electric actuator (021) controls the lifting and lowering of the sliding sealing valve plate one (023) and the sliding sealing valve plate two (024) through the valve stem (022). The guide groove one (025) and the guide groove two (026) are fixed on the water inlet baffle (9). When the sliding sealing valve plate 1 (023) and the sliding sealing valve plate 2 (024) rise, the guide groove 1 (025) fixes the switching trajectory of the sliding sealing valve plate 1 (023), and the guide groove 2 (026) fixes the switching trajectory of the sliding sealing valve plate 2 (024), so that the valve plate does not deviate from the direction. During forward filtration, the valve rod (022) rises and the water inlet hole closed by the sliding sealing valve plate 1 (023) opens. During backwashing, the valve rod (022) falls and the sliding sealing valve plate 1 (023) closes the water inlet hole, and the backwash side flushing port (18) opens.

4. A variable speed filtration device according to claim 3, characterized in that, The backwash side flushing port (18) is equipped with a grid screen.

5. A variable speed filtration device according to claim 1, characterized in that, The graded filter media (5) includes quartz sand and anthracite, with an effective particle size of 0.9-1.0 mm for quartz sand and 1.0-2.0 mm for anthracite; the height ratio of quartz sand to anthracite is 5:

3.

6. A variable speed filtration device according to claim 1, characterized in that, Each water distribution hole (071) on the water distribution plate (7) corresponds to a variable speed regulating water cap (6). The variable speed regulating water cap (6) includes an adjusting screw (065). The adjusting screw (065) clamps and fixes the fixed base (066) and the lower part of the filter screen (063) on the water distribution hole (071) of the water distribution plate (7). The fixing nut (061) cooperates with the adjusting screw (065). The entire variable speed regulating water cap (6) is fastened to the water distribution plate (7) by the fixing nut (061). The lower part of the fixing nut (061) is the regulating water cap body. The regulating water cap body includes a floating filter umbrella (064). The upper part of the floating filter umbrella (064) is provided with a filter screen (063). The upper part of the filter screen (063) is a top cover (062).

7. A variable speed filtration device according to claim 6, characterized in that, The filter mesh (063) is made of a wound tube with a filtration accuracy of 0.25 mm, and the floating filter umbrella (064) is an umbrella-shaped filter plate with its center connected to the adjusting screw (065).

8. A variable speed filtration device according to claim 1, characterized in that, The water distribution plate (7) adopts a diamond-shaped water distribution hole. The four diagonally opposite water distribution holes of the diamond-shaped water distribution hole are arranged in a diamond shape, and the center distance of each adjacent diagonally opposite water distribution hole is the same.

9. A variable speed filtration device according to claim 1, characterized in that, The water distributor (8) includes a main pipe (081), a branch pipe (082), a water distribution hole (083), and a fixing component. The main pipe (081) and the branch pipe (082) are fixed to the filter tank (1) by the fixing component. The main pipe (081) is connected to the backwash water port (14).

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