Liquid filter

Abstract

The utility model discloses a liquid filter which comprises a filter tank, a filtered liquid collecting pipe and a plurality of hollow to-be-filtered liquid outlet filter sticks, wherein the filtered liquid collecting pipe and the hollow to-be-filtered liquid outlet filter sticks are arranged in the filter tank; the filtered liquid collecting pipe and the to-be-filtered liquid outlet filter sticks are arranged in the axial direction of the filter tank, the to-be-filtered liquid outlet filter sticks are annularly or arc-shaped distributed at intervals along the inner side wall of the filter tank, the lower ends of the to-be-filtered liquid outlet filter sticks are communicated with the to-be-filtered liquid inlet pipe, a plurality of micro through holes are formed in the peripheral wall of the filtered liquid collecting pipe, and the micro through holes are communicated with the to-be-filtered liquid inlet pipe. The filtered liquid collecting pipe is located in the center of the filter tank or located on the inner side wall, opposite to the to-be-filtered liquid outlet filter sticks, of the filter tank, the lower end of the filtered liquid collecting pipe is communicated with the filtered liquid outlet pipe, and the space between the filtered liquid collecting pipe and each to-be-filtered liquid outlet filter stick is filled with a filter material particle layer. The liquid filter has a large filtering area, and compared with a traditional filter, under the condition of the same filtering area, the diameter of the tank body is smaller, the back washing liquid amount is smaller, the occupied area of the tank body is reduced, and the machining cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of filtering equipment, and particularly relates to a liquid filter. Background Art

[0002] At present, it is common to use filter media as filtering equipment to separate impurities in water. It has the characteristics of wide water quality and stable water quality. The filtering capacity of filter media depends on the filtering area and filtering speed. The existing filter media filters mostly adopt vertical structures. The liquid to be filtered enters the tank from the top of the tank, passes through the filtering layer, and is collected by the water collecting filter rod or water collecting cap set at the bottom of the tank and then discharged. The filtering area is the radial cross-sectional area of ​​the tank, and the filtering area is small. If a large amount of liquid to be filtered is to be filtered, the radial cross-sectional area of ​​the tank needs to be increased, so that the volume of the tank increases and the floor space increases, which in turn increases the manufacturing cost of the filtering equipment and the construction cost of the machine room. Utility Model Content

[0003] In view of the above problems, the utility model discloses a liquid filter to overcome the above problems or at least partially solve the above problems.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model discloses a liquid filter, comprising a filter tank, a filtered liquid collecting pipe arranged in the filter tank and a plurality of hollow filter rods for discharging filtered liquid;

[0006] The lower part of the filter tank is respectively provided with a liquid inlet pipe for a filtrate and a liquid outlet pipe for a filtrate. The filtrate collecting pipe and each of the filtrate outlet filter rods are arranged along the axial direction of the filter tank, and a plurality of the filtrate outlet filter rods are arranged in a ring or arc shape at intervals along the inner wall of the filter tank. The lower end of each of the filtrate outlet filter rods is connected with the liquid inlet pipe for a filtrate. A plurality of micro through holes are opened on the outer peripheral wall of the filtrate collecting pipe. The filtrate collecting pipe is located at the center of the filter tank or at the inner side wall of the filter tank opposite to the position of each of the filtrate outlet filter rods. The lower end of the filtrate collecting pipe is connected with the filtrate outlet pipe. A layer of filter material particles is filled between the filtrate collecting pipe and each of the filtrate outlet filter rods.

[0007] Furthermore, the upper end of each of the filter rods for discharging the filtrate passes through the surface of the filter material particle layer, and the upper end of the filtered liquid collecting pipe is closed and located in the filter material particle layer.

[0008] Furthermore, the upper end of the filtered liquid collecting pipe is 300 mm to 700 mm lower than the surface of the filter material particle layer.

[0009] Furthermore, a plurality of the filter rods for discharging the filtrate are arranged in a ring shape along the inner wall of the filter tank, the filtered liquid collecting pipe is located at the center of the filter tank, and the liquid filter further comprises a ring-shaped flow guide pipe;

[0010] The guide pipe is coaxially arranged in the filter tank and is connected to the liquid inlet pipe for the filtrate. A plurality of filter rod seats are evenly arranged on the upper part of the guide pipe. The lower end of the filter rod for the filtrate outlet is fixedly connected to the filter rod seat and is connected to the guide hole on the guide pipe.

[0011] Furthermore, a manhole is formed at the upper end of the filter tank, a manhole is covered with a hole cover, and the manhole and the hole cover are connected via a flange structure.

[0012] Furthermore, a plurality of lifting rings are provided at the upper end of the filter tank, and a plurality of supporting legs are provided at the lower end of the filter tank.

[0013] Furthermore, a collecting pipe base is provided at the lower end of the filtered liquid collecting pipe, the collecting pipe base and the filtered liquid collecting pipe are connected via a threaded structure, and the collecting pipe base is communicated with the filtered liquid outlet pipe.

[0014] Furthermore, it also includes a backwash water inlet water distribution tray and a plurality of backwash water inlet filter rods arranged in the filter tank;

[0015] A recoil liquid inlet pipe is provided at the bottom end of the filter tank, the recoil water inlet water distribution tray is connected to the recoil liquid inlet pipe, a plurality of recoil water inlet filter rods are evenly connected to the outer peripheral surface of the recoil water inlet water distribution tray, and a recoil liquid outlet pipe is provided at the upper part of the filter tank, and the recoil liquid outlet pipe is higher than the surface of the filter material particle layer.

[0016] Furthermore, the filtered liquid outlet pipe is T-shaped, the first end of the filtered liquid outlet pipe is connected to the liquid collecting pipe base, the second end of the filtered liquid outlet pipe is fixedly connected to the backwash water inlet distribution tray, and the third end of the filtered liquid outlet pipe passes through the filter tank.

[0017] The advantages and beneficial effects of the utility model are:

[0018] The liquid filter of the utility model has a large filtration area, and under the condition that the diameter of the filter tank remains unchanged, the filtration area can be increased by increasing the tank height of the filter tank, the filter layer depth of the filter material particle layer and the length of the filter rod for the filtrate outlet. Compared with the traditional filter, under the condition of the same filtration area, the diameter of the filter tank is smaller, which can effectively reduce the occupied area and reduce the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0020] Figure 1 It is a cross-sectional view of the liquid filter in Example 1 of the utility model along the axial direction;

[0021] Figure 2 It is a cross-sectional view of the liquid filter in Example 1 of the utility model along the radial direction;

[0022] Figure 3 It is a cross-sectional view of the liquid filter in Example 2 of the utility model along the radial direction;

[0023] Figure 4 It is a top view of the flow guide pipe in Example 1 of the utility model;

[0024] Figure 5 for Figure 4 Sectional view along the middle line AA;

[0025] Figure 6 This is a schematic diagram of the structure of the filter rod for discharging the filtrate in Example 1 of the utility model;

[0026] Figure 7 This is a structural diagram of the connection between the filtered liquid outlet pipe and the liquid collecting pipe base in Example 1 of the utility model;

[0027] Figure 8 This is a schematic diagram of the flow direction of the liquid during filtration in the liquid filter of Example 1 of the utility model;

[0028] Fig. 9 This is a schematic diagram of the flow direction of the flushing liquid during backwashing of the liquid filter in Example 1 of the utility model.

[0029] In the figure: 1. filter tank; 1-1. cylinder section; 1-2. upper head; 2. filtered liquid collecting pipe; 3. filter rod for filtrate outlet; 4. filtrate inlet pipe; 5. filtered liquid outlet pipe; 6. filter material particle layer; 7. guide pipe; 8. filter rod seat; 9. guide hole; 10. manhole; 11. lifting ring; 12. supporting leg; 13. backwash water inlet distribution tray; 14. backwash water inlet filter rod; 15. backwash filtrate inlet pipe; 16. backwash filtered liquid outlet pipe; 17. internal threaded port; 18. threaded joint; 19. filter hole; 20. collecting pipe base. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] Example 1

[0033] This embodiment provides a liquid filter, such as Figure 1 , Figure 2 and Figure 8 As shown, the liquid filter comprises a filter tank 1, a filtered liquid collecting pipe 2 and a plurality of hollow filter rods 3 for discharging the filtered liquid, arranged in the filter tank 1. Figure 6 As shown, filter holes 19 are formed on the outer peripheral surface of the filter rod 3 for discharging the filtrate.

[0034] Specifically, the lower part of the filter tank 1 is respectively provided with a filtrate inlet pipe 4 and a filtered liquid outlet pipe 5, which can be arranged on the same side or different sides of the filter tank 1, and the filtered liquid collecting pipe 2 and each filtered liquid outlet filter rod 3 are arranged along the axial direction of the filter tank 1, that is, the filtrate collecting pipe 2 and each filtered liquid outlet filter rod 3 are arranged in the filter tank 1 parallel to the axis of the filter tank 1, and a plurality of filtered liquid outlet filter rods 3 are arranged in a ring-shaped interval along the inner wall of the filter tank 1, and the lower end of each filtered liquid outlet filter rod 3 is connected to the filtrate inlet pipe 4, so that the filtered liquid can enter the filtered liquid outlet filter rod 3 through the filtrate inlet pipe 4, and then the filtered liquid is discharged through the filtered liquid outlet filter rod 3; preferably, each The filter rods 3 for discharging the filtrate are arranged evenly at intervals; a plurality of micro-through holes are opened on the outer peripheral wall of the filtered liquid collecting pipe 2, and the filtered liquid collecting pipe 2 is located at the center of the filter tank 1, that is, the filtered liquid collecting pipe 2 is located at the center of the ring formed by the plurality of filtered liquid discharging filter rods 3, so that the distances from the filtered liquid collecting pipe 2 to each filtered liquid discharging filter rod 3 are the same, and the lower end of the filtered liquid collecting pipe 2 is connected with the filtered liquid outlet pipe 5, and the liquid in the filtered liquid collecting pipe 2 can flow out of the filter tank 1 through the filtered liquid outlet pipe 5, and the filtered liquid is collected through the filtered liquid collecting pipe 2; a filter material particle layer 6 is filled between the filtered liquid collecting pipe 2 and each filtered liquid outlet filter rod 3, and the filter material particle layer 6 is used to filter out impurities in the liquid to be filtered. Among them, the aperture of the micro-through hole is smaller than the diameter of the filter material particles, so that the filter material particles can only be located between the filtered liquid collecting pipe and each filter rod for the filtrate outlet, and cannot enter the filtered liquid collecting pipe; the filter material particles are quartz sand, glass filter material or anthracite, and the particle size range is 0.2mm~1.0mm.

[0035] In this way, Figure 8 As shown, the liquid to be filtered that enters the filter tank 1 through the liquid inlet pipe 4 will first flow into each liquid outlet filter rod 3, and then flow into the filter material particle layer 6 through the filter hole 19 on the liquid outlet filter rod 3, and the impurities will be filtered through the filter material particle layer 6 between the liquid outlet filter rod 3 and the filtered liquid collecting pipe 2, and the filtered clean liquid will flow into the filtered liquid collecting pipe 2 through the micro-through hole and flow out through the filtered liquid outlet pipe 5. If the filtration area needs to be increased, it can be achieved by increasing the tank height of the filter tank, the filter layer depth of the filter material particle layer and the length of the liquid outlet filter rod, so that the liquid filter does not need to occupy a larger floor space.

[0036] In summary, the liquid filter of this embodiment has a larger filtration area, and under the condition that the diameter of the filter tank remains unchanged, the filtration area can be increased by increasing the tank height of the filter tank, the filter layer depth of the filter material particle layer and the length of the filter rod for the filtrate outlet. Compared with the traditional filter, under the condition of the same filtration area, the filter tank diameter is smaller, which can effectively reduce the footprint and reduce the cost of use.

[0037] In this embodiment, Figure 1 As shown, the upper end of each filter rod 3 for filtrate outlet passes through the surface of the filter material particle layer 6, and the upper end of the filtered liquid collecting pipe 2 is closed and located in the filter material particle layer 6, that is, the upper end of the filter rod 3 for filtrate outlet is located above the surface of the filter material particle layer 6, and the upper end of the filtered liquid collecting pipe 2 is located below the surface of the filter material particle layer 6. In this way, the liquid to be filtered in the filter rod 3 for filtrate outlet will flow out to the surface of the filter material particle layer 6 through the upper end of the filter rod 3 for filtrate outlet, and the liquid to be filtered will flow downward due to the pressure, and be filtered through the filter material particle layer 6 between the upper end of the filtered liquid collecting pipe 2 and the surface of the filter material particle layer 6; when the diameter of the filter tank is D and the height of the filtered liquid collecting pipe is L, the total filtration area of ​​the liquid filter is πDL+1 / 4πD 2 Compared with the traditional vertical filter, the filtration area is only 1 / 4πD 2 , with stronger filtering ability. In addition, the tiny debris in the liquid to be filtered that cannot pass through the filter holes into the filter material particle layer will enter the surface of the filter material particle layer from the upper end of the filter rod for the liquid to be filtered. The tiny debris is accommodated by the space above the surface of the filter material particle layer, which can effectively prevent the filter rod for the liquid to be filtered from being blocked by tiny debris and affect the filtering ability.

[0038] Taking a filter tank with a diameter of 2 meters as an example, its circumference is 6.28 meters. When the filter layer height of the filter material particle layer is 1.5 meters and the length of the filtered liquid collecting pipe is 1.0 meter, its filtration area is 9.42 square meters, which is equivalent to 3 conventional quartz sand filters with a diameter of 2 meters. The liquid filter of this embodiment reduces the floor space by 2 / 3 and the material consumption by more than 50%.

[0039] Furthermore, the upper end of the filtered liquid collecting pipe is 300 mm to 700 mm lower than the surface of the filter material particle layer, thereby ensuring that the liquid to be filtered is effectively filtered through the filter material particle layer above the filtered liquid collecting pipe.

[0040] In this embodiment, Figure 2 , Figure 4 and Figure 5 As shown, a plurality of filter rods 3 for discharging filtrate are arranged in a ring shape along the inner wall of the filter tank 1 , a filtered liquid collecting pipe 2 is located at the center of the filter tank 1 , and the liquid filter further comprises a ring-shaped flow guide pipe 7 .

[0041] The guide tube 7 is coaxially arranged in the filter tank 1 and is connected with the filtrate inlet pipe 4. A plurality of filter rod seats 8 are evenly arranged on the upper part of the guide tube 7. The lower end of the filtrate outlet filter rod 3 is fixedly connected to the filter rod seat 8 and is connected with the guide hole 9 on the guide tube 7. The filtrate in the filtrate inlet pipe 4 can be guided through the guide tube 7 and then evenly flows into each filtrate outlet filter rod 3 through the guide hole 9. The guide tube can be fixed to the inner wall of the filter tank by screws or bolts or by welding, and the filtrate outlet filter rod and the filter rod seat can be fixedly connected by a threaded structure for disassembly and maintenance. Specifically, as Figure 6 As shown, one end of the filter rod for filtrate outlet is provided with a threaded joint 18, and the other end of the filter rod for filtrate outlet is provided with an internal threaded opening 17. The filter rod for filtrate outlet can be fixedly connected to the filter rod seat through the threaded joint 18 or the internal threaded opening 17.

[0042] In addition, if Figure 1 As shown, a manhole 10 is opened at the upper end of the filter tank 1, and a manhole cover is covered on the manhole 10. The manhole 10 and the manhole cover are connected by a flange structure. The setting of the manhole 10 facilitates the assembly and maintenance of the internal structure of the filter tank 1.

[0043] Furthermore, a plurality of lifting rings 11 are provided at the upper end of the filter tank 1, and the filter tank 1 can be lifted by the lifting rings 11, thereby facilitating the transportation of the filter tank 1; a plurality of supporting legs 12 are provided at the lower end of the filter tank 1, and the filter tank 1 is supported and fixed by the supporting legs 12.

[0044] In this embodiment, Figure 7 and Figure 8 As shown, a collecting pipe base 20 is provided at the lower end of the filtered liquid collecting pipe 2, and the collecting pipe base 20 and the filtered liquid collecting pipe 2 are connected by a threaded structure, and the collecting pipe base 20 is used to support and fix the filtered liquid collecting pipe 2. The collecting pipe base 20 and the filtered liquid outlet pipe 5 are connected, so that the filtered liquid can enter the collecting pipe base 20 from the filtered liquid collecting pipe 2, and then enter the filtered liquid outlet pipe 5 through the collecting pipe base 20, and flow out from the filtered liquid outlet pipe 5.

[0045] In addition, if Figure 1 As shown, the liquid filter further includes a backwash water inlet distribution tray 13 and a plurality of backwash water inlet filter rods 14 arranged in the filter tank 1 .

[0046] Specifically, a backwash filtrate inlet pipe 15 is provided at the bottom end of the filter tank 1, a backwash water inlet distribution tray 13 is connected to the backwash filtrate inlet pipe 15, and a plurality of backwash water inlet filter rods 14 are evenly connected to the outer peripheral surface of the backwash water inlet distribution tray 13, that is, a filter rod connecting joint is provided on the outer peripheral surface of the backwash water inlet distribution tray 13, and the backwash water inlet filter rods 14 are connected and fixed to the filter rod connecting joint, the backwash water inlet distribution tray 13 and the backwash water inlet filter rods 14 are both located at the bottom of the filter material particle layer 6, and a backwash filtered liquid outlet pipe 16 is provided at the upper part of the filter tank 1, and the backwash filtered liquid outlet pipe 16 is higher than the surface of the filter material particle layer 6. Fig. 9 As shown, during backwashing, the backwashing liquid enters the filter tank 1 through the backwash filtrate inlet pipe 15, and the backwashing liquid is evenly spread at the bottom of the filter material particle layer 6 through the backwashing water inlet water distribution tray 13 and the backwashing water inlet filter rod 14. With the continuous injection of the backwashing liquid, the backwashing liquid flows upward along the axial direction of the filter tank 1 to flush the filter material particle layer 6 and take away the debris in the filter material particle layer 6. The waste liquid generated by the flushing flows out through the backwashing filtrate outlet pipe 16. In this embodiment, the backwashing area is only 1 / 4πD 2 , reducing the amount of liquid used for backwashing and lowering the cost of using liquid filters.

[0047] And, if Figure 7 and Figure 8 As shown, the filtered liquid outlet pipe 5 is T-shaped, the first end of the filtered liquid outlet pipe 5 is connected to the liquid collecting pipe base 20, the second end of the filtered liquid outlet pipe 5 is fixedly connected to the backwash water inlet distribution tray 13, and the third end of the filtered liquid outlet pipe 5 passes through the filter tank 1.

[0048] In addition, if Figure 1 As shown, the filter tank 1 includes a cylinder section 1-1 and an upper head 1-2, a manhole 10 and a lifting ring 11 are arranged on the upper head 1-2, and the cylinder section 1-1 and the upper head 1-2 are sealed and connected, and can be fixed by welding.

[0049] Furthermore, a preliminary filter, such as a hair collector, may be provided at the liquid inlet pipe to be filtered. The filter mesh aperture of the preliminary filter should be smaller than the filter hole aperture on the filter rod for the liquid outlet to be filtered, so as to filter out larger impurities in the liquid to be filtered in advance.

[0050] Example 2

[0051] The difference between this embodiment and embodiment 1 is that Figure 3As shown, a plurality of filter rods 3 for filtrate outlet are arranged in an arc-shaped interval along the inner side wall of the filter tank 1, and the filtered liquid collecting pipe 2 is located at the inner side wall of the filter tank 1 opposite to the position of each filter rod 3 for filtrate outlet, that is, a plurality of filter rods 3 for filtrate outlet are arranged on one side of the filter tank 1, and the filtered liquid collecting pipe 2 is located on the other side of the filter tank 1. The arrangement of the filter rods 3 for filtrate outlet and the filtered liquid collecting pipe 2 in this embodiment is suitable for filter tanks 1 with smaller diameters, ensuring the distance between the filter rods 3 for filtrate outlet and the filtered liquid collecting pipe 2, so that the liquid filter still has a good filtering capacity. When the volume of the filter tank is too small and people are not enough to enter the filter tank for installation, the filtered liquid collecting pipe can be set below the manhole to facilitate early installation and later maintenance.

[0052] The above description is only a specific implementation of the present invention. Under the above teaching of the present invention, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present invention, and the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A liquid filter, characterized in that: It comprises a filter tank, a filtered liquid collecting pipe and a plurality of hollow filter rods for discharging the filtered liquid arranged in the filter tank; The lower part of the filter tank is respectively provided with a liquid inlet pipe for a filtrate and a liquid outlet pipe for a filtrate. The filtrate collecting pipe and each of the filtrate outlet filter rods are arranged along the axial direction of the filter tank, and a plurality of the filtrate outlet filter rods are arranged in a ring or arc shape at intervals along the inner wall of the filter tank. The lower end of each of the filtrate outlet filter rods is connected with the liquid inlet pipe for a filtrate. A plurality of micro through holes are opened on the outer peripheral wall of the filtrate collecting pipe. The filtrate collecting pipe is located at the center of the filter tank or at the inner side wall of the filter tank opposite to the position of each of the filtrate outlet filter rods. The lower end of the filtrate collecting pipe is connected with the filtrate outlet pipe. A layer of filter material particles is filled between the filtrate collecting pipe and each of the filtrate outlet filter rods.

2. The liquid filter according to claim 1, characterized in that The upper end of each of the filter rods for discharging the filtrate passes through the surface of the filter material particle layer, and the upper end of the filtered liquid collecting pipe is closed and located in the filter material particle layer.

3. The liquid filter according to claim 2, characterized in that: The upper end of the filtered liquid collecting pipe is 300 mm to 700 mm lower than the surface of the filter material particle layer.

4. The liquid filter according to claim 1, characterized in that A plurality of the filter rods for discharging the filtrate are arranged in a ring shape along the inner wall of the filter tank, the filtered liquid collecting pipe is located at the center of the filter tank, and the liquid filter further comprises a ring-shaped flow guide pipe; The guide pipe is coaxially arranged in the filter tank and is connected to the liquid inlet pipe for the filtrate. A plurality of filter rod seats are evenly arranged on the upper part of the guide pipe. The lower end of the filter rod for the filtrate outlet is fixedly connected to the filter rod seat and is connected to the guide hole on the guide pipe.

5. The liquid filter according to claim 1, characterized in that: A manhole is formed at the upper end of the filter tank, and a hole cover is formed on the manhole. The manhole and the hole cover are connected via a flange structure.

6. The liquid filter according to claim 1, characterized in that The upper end of the filter tank is provided with a plurality of hanging rings, and the lower end of the filter tank is provided with a plurality of supporting legs.

7. The liquid filter according to any one of claims 1 to 6, characterized in that: A collecting pipe base is provided at the lower end of the filtered liquid collecting pipe, the collecting pipe base and the filtered liquid collecting pipe are connected via a threaded structure, and the collecting pipe base is communicated with the filtered liquid outlet pipe.

8. The liquid filter according to claim 7, characterized in that It also includes a backwash water inlet water distribution tray and a plurality of backwash water inlet filter rods arranged in the filter tank; A recoil liquid inlet pipe is provided at the bottom end of the filter tank, the recoil water inlet water distribution tray is connected to the recoil liquid inlet pipe, a plurality of recoil water inlet filter rods are evenly connected to the outer peripheral surface of the recoil water inlet water distribution tray, and a recoil liquid outlet pipe is provided at the upper part of the filter tank, and the recoil liquid outlet pipe is higher than the surface of the filter material particle layer.

9. The liquid filter according to claim 8, characterized in that The filtered liquid outlet pipe is T-shaped, the first end of the filtered liquid outlet pipe is connected to the liquid collecting pipe base, the second end of the filtered liquid outlet pipe is fixedly connected to the backwash water inlet distribution tray, and the third end of the filtered liquid outlet pipe passes through the filter tank.

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