A primary wastewater filter separator

Abstract

The utility model discloses a wastewater primary filter separator, its technical scheme main points include the water inlet pipe and filter water pipe, and the water outlet is installed with the filter assembly, and the filter assembly includes filter plate and movable plate, and the filter plate fixed mounting is in the water outlet inner perimeter, and the movable plate is located filter plate towards filter water pipe middle one side, still include connecting shaft, and the connecting shaft coaxial setting is in the filter water pipe, and can along the axial activity adjustment, and the movable plate fixed mounting is in the connecting shaft, and filter plate is set up with a plurality of filter through -hole no.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment devices, and more specifically, to a primary wastewater filtration separator. Background Technology

[0002] In existing wastewater treatment technologies, primary filtration separators are key equipment in the pretreatment stage. Their main function is to remove suspended solids and large particulate impurities from wastewater to reduce the load on subsequent treatment processes.

[0003] Current filter separators typically employ a metal or fiber mesh structure. The fine mesh openings of the filter are used to remove suspended solids and large particulate impurities. However, during the filtration process, suspended solids and large particulate impurities can easily clog the fine mesh openings, especially in the primary stage where wastewater is not pre-cleaned and contains a relatively high amount of suspended solids and large particulate impurities, making clogging more likely. Clogging increases the pressure on the filter screen, affecting filtration efficiency.

[0004] Therefore, a new solution is needed to address this problem. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a primary wastewater filter separator that features bidirectional filtration and flexible switching, while also ensuring efficient separation and reliable sealing, and is easy to install, disassemble and maintain.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a primary wastewater filtration separator, comprising an inlet pipe and a filter pipe, wherein outlets are provided at both ends of the filter pipe, and a filter assembly is installed inside the outlet. The filter assembly includes a filter plate and a movable plate, wherein the filter plate is fixedly installed on the inner circumference of the outlet, and the movable plate is located on the side of the filter plate facing the outlet; it also includes a connecting shaft, which is coaxially disposed inside the filter pipe and can be adjusted axially; the movable plate is fixedly installed on the connecting shaft; the filter plate has a plurality of filter channels. A plurality of filter limiting blocks are fixedly connected to the side of the movable plate facing the filter plate. Each filter limiting block corresponds to a filter through hole, and the outline of the filter limiting block is smaller than that of the filter through hole. The movable plate has a first working position close to the filter plate and a second working position away from the filter plate. In the first working position, a portion of the filter limiting block is embedded in the filter through hole, forming a filter gap between the filter limiting block and the inner sidewall of the filter through hole. In the second working position, the filter limiting block is disengaged from the filter through hole, and the filter through hole is open.

[0007] By adopting the above solution, the filter limiting block 1 on the movable plate is matched with the filter through hole 1 on the filter plate, and driven axially by the connecting shaft, the movable plate has two distinct working positions: When in the first working position, part of the filter limiting block is embedded in the filter through hole 1, forming a stable and uniform annular filter gap 1, which can effectively intercept large particles of impurities, while ensuring smooth water flow and avoiding clogging of the filter channel due to pressure fluctuations, significantly improving the accuracy and reliability of primary filtration; when switching to the second working position, the filter limiting block 1 is completely disengaged, making the filter through hole 1 fully open, thus providing a smooth channel for impurity cleaning and component flushing, greatly simplifying the maintenance process.

[0008] The present invention is further configured such that the movable plate has a plurality of filter through holes II, and a plurality of filter limiting blocks II are fixedly connected to the side of the filter plate facing the movable plate. The filter limiting blocks II correspond one-to-one with the filter through holes II, and the outline of the filter limiting blocks II is smaller than that of the filter through holes II. In the first working position, the filter limiting blocks II are partially embedded in the filter through holes II, forming a filter gap II between the filter limiting blocks II and the inner sidewall of the filter through holes II. In the second working position, the filter limiting blocks II are disengaged from the filter through holes II, and the filter through holes II are open.

[0009] By adopting the above scheme, a bidirectional, cross-type limiting block-through-hole cooperation mechanism is used on the basis of the original filter structure. When the movable plate is in the first working position, not only does limiting block one embed into the filter plate through-hole one to form filter gap one, but limiting block two on the filter plate also embeds into the movable plate through-hole two, forming another independent filter gap two. This structure together constitutes a mutually supportive and stable composite filter chamber, which significantly enhances the overall rigidity and stability of the filter assembly, effectively prevents vibration or displacement caused by water flow impact, and ensures a constant filter gap.

[0010] The present invention is further configured such that the filter assembly includes a limiting plate, the limiting plate being located on the side of the movable plate facing away from the filter plate, and the limiting plate being fixedly installed on the inner circumference of the outlet; the limiting plate has a plurality of flow holes, the positions of the flow holes being offset from the second filter through hole; in the first working position, the movable plate and the limiting plate are separated from each other, and the flow holes and the second filter through hole are connected through the gap between the movable plate and the limiting plate; in the second working position, the movable plate and the limiting plate are pressed against each other, and the flow holes and the second filter through hole are offset and closed.

[0011] By adopting the above scheme, a fixed limiting plate is added to the outlet side of the filter assembly. Through its synergistic effect with the movable plate, the opening and closing of the filter channel is controlled. When the movable plate is in the first working position, a certain gap is maintained between it and the limiting plate. Although the flow holes on the limiting plate and the filter through holes on the movable plate are misaligned, they can still be connected through this gap, forming a circuitous but unobstructed outlet path to ensure the smooth discharge of filtered wastewater. When the movable plate switches to the second working position, the movable plate and the limiting plate fit tightly together, and the holes on their surfaces are mutually sealed due to the misalignment, thereby blocking the water flow channel and achieving reliable sealing and interception.

[0012] The present invention is further configured such that a plurality of sealing blocks I are fixedly connected to the side of the movable plate facing the limiting plate, and sealing blocks II are fixedly connected to the side of the limiting plate facing the movable plate; at the second working position, sealing blocks I and sealing blocks II are respectively embedded in the flow hole and the filter through hole II to achieve sealing.

[0013] By adopting the above scheme, sealing block one and sealing block two are respectively set on the opposite surfaces of the movable plate and the limiting plate. When the movable plate moves to the second working position, the blocks on both sides can be embedded into the corresponding flow holes and filter through holes two, forming a bidirectional cross-embedded seal. This structure not only achieves the first end face seal through the planar fit of the plate surfaces, but also utilizes the tight fit between the blocks and the hole walls to form multiple radial sealing barriers inside the flow channel, improving the sealing reliability in the closed state. At the same time, the embedded block structure also enhances the rigidity and stability of the connection between the movable plate and the limiting plate in the closed state, effectively resisting water flow impact and ensuring the durability of the seal.

[0014] The present invention is further configured such that the travel of the connecting shaft is limited by the abutting of the movable plate and the limiting plate in the filter assembly; the two sets of filter assemblies are arranged symmetrically.

[0015] By adopting the above scheme, and symmetrically arranging two sets of filter components at both ends of the filter pipe, the axial travel of the connecting shaft when driving the movable plate to slide can be limited by the limiting plates of the two workstations: when the movable plate moves to one end to the first working position, it abuts against the limiting plate on the opposite side, forming a positive limiting; when it moves in the opposite direction to the second working position, it abuts against the limiting plate on that side, forming a reverse limiting. This mechanical limiting method not only eliminates the need for complex additional limiting mechanisms, making the structure more compact, but also ensures that the movable plate can be positioned in both working positions, thereby ensuring the stable formation of the filter gaps and the reliable fit of the sealing surface. The symmetrical layout design enables the equipment to quickly switch between bidirectional filtration functions, significantly improving the flexibility and efficiency of the processing flow.

[0016] The present invention is further configured such that the movable plate on the left abuts against the limiting plate, the filter assembly on the left is located in the second working position, and the filter assembly on the right is located in the first working position; the movable plate on the right abuts against the limiting plate, the filter assembly on the right is located in the second working position, and the filter assembly on the left is located in the first working position.

[0017] By adopting the above scheme, mechanical linkage enables the connecting shaft to drive the two movable plates on both sides to move synchronously, ensuring that their working states are always complementary: when the left movable plate abuts against the limit plate and the left filter component is in the second working position, the right filter component automatically moves to the first working position; and vice versa. This symmetrical and complementary workstation configuration allows the equipment to quickly switch filter channels without interrupting the water intake, achieving a situation where one side is filtered while the other side is sealed or awaiting maintenance. This not only improves the continuity and overall efficiency of wastewater treatment and avoids the problem of traditional single-channel filters having to be shut down for cleaning or maintenance, but also facilitates the cleaning of impurities from the alternately used filter sides.

[0018] The present invention is further configured such that the water filter pipe includes a central water filter pipe body and two water filter sleeves; the two water filter sleeves are respectively threaded to both ends of the water filter pipe body; the two water filter sleeves form a water outlet.

[0019] By adopting the above solution, this modular design breaks down the water filter pipe into a main body and two detachable filter sleeves, achieving reliable connection and sealing through threads. This structure simplifies the installation and maintenance process of the filter components (filter plates, movable plates, limiting plates, etc.). During cleaning, replacement, or maintenance, simply unscrewing the corresponding filter sleeve exposes all internal components on that side. Simultaneously, the threaded connection ensures structural strength and sealing reliability after assembly, enabling it to withstand system operating pressure and providing excellent re-assembly and disassembly performance.

[0020] The present invention is further configured such that the limiting plate is fixedly installed inside the filter sleeve, and the filter plate is fixedly installed at the end of the filter pipe body.

[0021] By adopting the above solution, the limiting plate is fixed inside the detachable filter sleeve, while the filter plate is fixed to the end of the filter pipe body. During equipment assembly, as the filter sleeve is screwed into the filter pipe body, the limiting plate and filter plate naturally form an installation cavity to accommodate and guide the movable plate. When cleaning or replacing internal components is required, simply unscrew the filter sleeve to complete the cleaning. This achieves modular quick-installation and quick-disassembly of the core filter components, improving maintenance convenience.

[0022] In summary, this utility model has the following beneficial effects:

[0023] 1. By working in conjunction with the sliding movable plate and the symmetrically arranged filter / sealing components, the filter channels can be flexibly switched and bidirectional water output can be achieved, which significantly improves the equipment's adaptability to different treatment processes and its overall efficiency.

[0024] 2. Through its internal structure, it forms a highly efficient multi-stage meandering filtration channel on the filtration side and a reliable multi-layer sealing barrier on the shut-off side, thus balancing high separation efficiency and sealing reliability.

[0025] 3. The stepped outlet design facilitates quick disassembly and assembly of core components, greatly simplifying maintenance; while the integrated thread enables centralized and simplified operation. Attached Figure Description

[0026] Figure 1 This is a perspective view of a primary wastewater filtration separator in this embodiment;

[0027] Figure 2 This is a cross-sectional view of a primary wastewater filtration separator in a non-operating state in this embodiment;

[0028] Figure 3 This is a cross-sectional view of a primary wastewater filtration separator in operation in this embodiment;

[0029] Figure 4 This is a cross-sectional view of the limiting plate in this embodiment;

[0030] Figure 5 for Figure 2 Enlarged view of point A in the middle;

[0031] Figure 6 for Figure 3 Enlarged view of point B in the middle;

[0032] Figure 7 This is a schematic diagram of the filter sleeve detaching from the main body of the filter pipe in this embodiment.

[0033] Reference numerals in the attached drawings: 1. Water inlet pipe; 2. Water filter pipe; 20. Water outlet; 21. Water filter pipe body; 22. Water filter sleeve; 3. Filter plate; 31. Filter limiting block 2; 32. Filter through hole 1; 33. Guide sleeve 1; 34. Filter gap 1; 4. Movable plate; 41. Sealing block 1; 42. Filter limiting block 1; 43. Filter through hole 2; 44. Filter gap 2; 45. Limiting plate; 51. Sealing block 2; 52. Flow hole; 53. Guide sleeve 2; 6. Connecting shaft; 71. Sealing ring 1; 72. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] This embodiment discloses a primary wastewater filtration separator, referring to... Figures 1-6 As shown, it includes an inlet pipe 1 and a filter pipe 2. The filter pipe 2 adopts a three-section structure, including a middle filter pipe body 21 and two filter sleeves 22. The two filter sleeves 22 are reliably connected to the filter pipe body 21 by threads, and the two filter sleeves 22 form an outlet 20.

[0036] The inlet pipe 1 is located on one side of the middle of the filter pipe 2. The axis of the inlet pipe 1 is set perpendicular to the axis of the filter pipe 2. After the wastewater flows into the inlet pipe 1, it is filtered in the filter pipe 2. When in operation, it flows out from the outlet 20 and enters the corresponding subsequent wastewater treatment tank.

[0037] Reference Figure 5 As shown, each outlet 20 is equipped with a filter assembly, which includes a filter plate 3 and a movable plate 4. From the inside out, the outlet 20 is fitted with the filter plate 3, the movable plate 4, and the limiting plate 5. The filter plate 3 is fixedly installed on the inner circumference of the outlet 20, the limiting plate 5 is fixedly installed inside the filter sleeve 22, and the movable plate 4 is located on the side of the filter plate 3 facing the outlet 20, inside the filter pipe 2 near the outlet 20. When cleaning the filter assembly is required, the filter sleeve 22 can be disassembled by thread, opening the end of the filter pipe 2 and exposing the components of the filter assembly for easy cleaning.

[0038] The outer edges of the filter plate 3 and the limiting plate 5 are respectively fixedly fitted with sealing ring 1 71 and sealing ring 2 72. Both sealing ring 1 71 and sealing ring 2 72 are made of elastic rubber material, which can effectively fill the micro gap between the component and the mounting surface to form a reliable static seal.

[0039] The inner wall of the filter pipe body 21 near the outlet 20 and the filter sleeve 22 is designed with a stepped structure, forming an installation step for axial positioning. Sealing ring 71 and sealing ring 72 engage with the corresponding step positions to achieve a sealed contact. Through the friction between the corresponding sealing rings and the inner wall of the filter pipe 2 and the stepped surface, a snap-fit ​​fixation is achieved, thereby allowing the filter plate 3 and the limiting plate 5 to be fixedly installed.

[0040] This stepped structure not only provides axial positioning and a stable mounting base for the filter plate 3 and the limiting plate 5, ensuring they maintain the correct working position within the inner cavity and effectively preventing component movement caused by pressure fluctuations, but also creates a reliable radial sealing interface through the sealing rings on their outer edges and the sealing contact with the mounting steps. This effectively guarantees the sealing between the filter chamber and the outlet, eliminating leakage. Furthermore, it facilitates the quick disassembly and assembly of core components, improving the maintainability of the equipment.

[0041] Reference Figure 2 As shown, the filter assembly also includes a limiting plate 5, which is located on the side of the movable plate 4 facing away from the filter plate 3. The limiting plate 5 is fixedly installed on the inner circumference of the outlet 20 and inside the filter sleeve 22. The filter plate 3 is fixedly installed at the end of the filter pipe body 21. The movable plate 4 is located between the filter plate 3 and the limiting plate 5, and can slide back and forth along the inner wall of the filter pipe 2, and approach or fit against the filter plate 3 and the limiting plate 5. A guide sleeve 2 53 is fitted on the outer side of the limiting plate 5, and a guide sleeve 1 33 is fitted on the inner side of the filter plate 3. The guide sleeve 1 33 and the guide sleeve 2 53 are respectively The device is fixedly connected to the filter plate 3 and the limiting plate 5. It also includes a connecting shaft 6. The filter plate 3, the movable plate 4 and the limiting plate 5 are connected in series through the connecting shaft 6. The connecting shaft 6 is coaxially arranged inside the water filter pipe 2 and can be axially adjusted along the inner wall of the water filter pipe 2. The connecting shaft 6 can move axially along the guide sleeve 1 33 and the guide sleeve 2 53. One end of the connecting shaft 6 is connected to the driving device, and the driving device drives the connecting shaft 6 to move. The other end extends to the outside of the water outlet 20. The movable plate 4 is fixedly installed on the connecting shaft 6 and can switch the working position as the connecting shaft 6 moves.

[0042] By symmetrically arranging two sets of filter components at both ends of the water filter pipe 2, the travel of the connecting shaft 6 is limited by the abutting of the movable plate 4 and the limiting plate 5 in the filter components. By symmetrically arranging two sets of filter components at both ends of the water filter pipe 2, the axial travel of the connecting shaft 6 when driving the movable plate to slide can be limited by the limiting plates 5 of the two stations, ensuring a stable and reliable working position.

[0043] The filter plate 3 has several filter through holes 32. The movable plate 4 has several filter limiting blocks 42 fixedly connected to the side facing the filter plate 3. The filter limiting blocks 42 correspond one-to-one with the filter through holes 32, and the outline of the filter limiting blocks 42 is smaller than that of the filter through holes 32. The movable plate 4 has several filter through holes 43. The filter plate 3 has several filter limiting blocks 31 fixedly connected to the side facing the movable plate 4. The filter limiting blocks 31 correspond one-to-one with the filter through holes 43, and the outline of the filter limiting blocks 31 is smaller than that of the filter through holes 43. The limiting plate 5 has several flow holes 52. The positions of the flow holes 52 are offset from those of the filter through holes 43.

[0044] Reference Figure 3As shown, the movable plate 4 has two working positions, namely a first working position close to the filter plate 3 and a second working position far away from the filter plate 3.

[0045] In the first working position, filter limiting block 42 is partially embedded in filter through hole 32, forming a filter gap 34 between filter limiting block 42 and the inner wall of filter through hole 32; filter limiting block 31 is partially embedded in filter through hole 43, forming a filter gap 44 between filter limiting block 31 and the inner wall of filter through hole 43; in the second working position, filter limiting block 31 is disengaged from filter through hole 43, and filter through hole 43 is open.

[0046] The movable plate 4 and the limiting plate 5 are separated from each other. The flow hole 52 and the filter through hole 2 are connected through the gap between the movable plate 4 and the limiting plate 5. Several sealing blocks 1 41 are fixedly connected to the side of the movable plate 4 facing the limiting plate 5, and sealing blocks 2 51 are fixedly connected to the side of the limiting plate 5 facing the movable plate 4.

[0047] At the second working position, filter limiting block 42 disengages from filter through hole 32, and filter through hole 32 is open; movable plate 4 and limiting plate 5 press against each other and fit together, and flow hole 52 and filter through hole 43 are misaligned and closed; sealing block 41 and sealing block 51 are respectively embedded in flow hole 52 and filter through hole 43 to achieve sealing.

[0048] When the movable plate 4 slides to the first working position, a filtration channel is formed between the filter plate 3 and the movable plate 4, and a third filtration gap 45 is formed between the filter plate 3 and the movable plate 4. Together with the first filtration gap 34 and the second filtration gap 44, a meandering flow path is formed. After filtration, the wastewater flows through the second filtration gap 44, the third filtration gap 45 and the first filtration gap 34 in sequence, and is discharged from the outlet 20 and guided to the wastewater treatment tank connected to the outlet 20.

[0049] At the same time, the limiting plate 5 and the movable plate 4 on the other side are tightly fitted together, and the sealing block 1 41 and the flow hole 52, and the sealing block 2 51 and the filter through hole 2 43 are tightly fitted together to form a multi-seal mating part, which can reliably seal the outlet on this side.

[0050] The two sets of filter components are symmetrically arranged and complement each other in operation. When the movable plate 4 on the left abuts against the limiting plate 5, the filter component on the left is in the second working position and the filter component on the right is in the first working position, so that the right side filters and outputs water while the left side is sealed and closed. When the movable plate 4 on the right abuts against the limiting plate 5, the filter component on the right is in the second working position and the filter component on the left is in the first working position, so that the left side filters and outputs water while the right side is sealed and closed.

[0051] This symmetrical and complementary design allows the equipment to quickly switch filter channels without interrupting the water intake, improving the continuity of wastewater treatment and operational flexibility. It also facilitates online maintenance and backwashing of the alternately used filter sides, fully demonstrating the advantages of integrated design.

[0052] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A primary wastewater filtration separator, characterized in that, It includes an inlet pipe (1) and a filter pipe (2). The filter pipe (2) has outlets (20) at both ends. A filter assembly is installed inside the outlet (20). The filter assembly includes a filter plate (3) and a movable plate (4). The filter plate (3) is fixedly installed on the inner circumference of the outlet (20). The movable plate (4) is located on the side of the filter plate (3) facing the outlet (20). It also includes a connecting shaft (6), which is coaxially disposed inside the filter pipe (2) and can be adjusted axially; the movable plate (4) is fixedly installed on the connecting shaft (6); The filter plate (3) has a plurality of filter through holes (32), and the movable plate (4) is fixedly connected to a plurality of filter limiting blocks (42) on the side facing the filter plate (3). The filter limiting blocks (42) correspond one-to-one with the filter through holes (32), and the outline of the filter limiting blocks (42) is smaller than that of the filter through holes (32). The movable plate (4) has a first working position close to the filter plate (3) and a second working position away from the filter plate (3). In the first working position, the filter limiting block (42) is partially embedded in the filter through hole (32), and a filter gap (34) is formed between the filter limiting block (42) and the inner wall of the filter through hole (32). In the second working position, the filter limiting block (42) is disengaged from the filter through hole (32), and the filter through hole (32) is open.

2. The primary wastewater filtration separator according to claim 1, characterized in that, The movable plate (4) has a plurality of filter through holes (43). The filter plate (3) is fixedly connected to a plurality of filter limiting blocks (31) on the side facing the movable plate (4). The filter limiting blocks (31) correspond one-to-one with the filter through holes (43), and the outline of the filter limiting blocks (31) is smaller than that of the filter through holes (43). In the first working position, the filter limiting block 2 (31) is partially embedded in the filter through hole 2 (43), forming a filter gap 2 (44) between the filter limiting block 2 (31) and the inner sidewall of the filter through hole 2 (43); in the second working position, the filter limiting block 2 (31) is disengaged from the filter through hole 2 (43), and the filter through hole 2 (43) is open.

3. The primary wastewater filtration separator according to claim 1, characterized in that, The filter assembly also includes a limiting plate (5), which is located on the side of the movable plate (4) facing away from the filter plate (3). The limiting plate (5) is fixedly installed on the inner circumference of the outlet (20). The limiting plate (5) has several flow holes (52), and the positions of the flow holes (52) are offset from the filter through holes (43). At the first working position, the movable plate (4) and the limiting plate (5) are separated from each other, and the flow hole (52) and the filter through hole 2 are connected through the gap between the movable plate (4) and the limiting plate (5); at the second working position, the movable plate (4) and the limiting plate (5) press against each other and fit together, and the flow hole (52) and the filter through hole 2 (43) are misaligned and closed.

4. The primary wastewater filtration separator according to claim 3, characterized in that, A plurality of sealing blocks (41) are fixedly connected to the side of the movable plate (4) facing the limiting plate (5), and a sealing block (51) is fixedly connected to the side of the limiting plate (5) facing the movable plate (4). At the second working position, sealing block one (41) and sealing block two (51) are respectively embedded in the flow hole (52) and the filter through hole two (43) to achieve sealing.

5. A primary wastewater filtration separator according to claim 3, characterized in that, The travel of the connecting shaft (6) is limited by the abutting of the movable plate (4) and the limiting plate (5) in the filter assembly; the two filter assemblies are arranged symmetrically.

6. A primary wastewater filtration separator according to claim 5, characterized in that, The movable plate (4) on the left abuts against the limiting plate (5), the filter assembly on the left is in the second working position, and the filter assembly on the right is in the first working position; the movable plate (4) on the right abuts against the limiting plate (5), the filter assembly on the right is in the second working position, and the filter assembly on the left is in the first working position.

7. A primary wastewater filtration separator according to claim 3, characterized in that, The filter pipe (2) includes a central filter pipe body (21) and two filter sleeves (22); the two filter sleeves (22) are threaded to both ends of the filter pipe body (21); the two filter sleeves (22) form an outlet (20).

8. A primary wastewater filtration separator according to claim 7, characterized in that, The limiting plate (5) is fixedly installed inside the filter sleeve (22), and the filter plate (3) is fixedly installed at the end of the filter pipe body (21).

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