Hydraulic stirring PAC melting device

Abstract

The invention discloses a hydraulic stirring PAC material melting device which comprises a base, a material melting tank is installed on the base, the material melting tank comprises a tank body, a water adding pipe is arranged on one side of the upper portion of the tank body, and a blow-off pipe is arranged on the lower portion of the tank body; a pesticide storage box is arranged at the upper part of the tank body and comprises a box body, and a plurality of feeding pipes which are uniformly arranged are arranged between the tank body and the box body; a water pump is arranged on one side of the chemical material tank, a water inlet pipe of the water pump is connected with the upper portion of the chemical material tank, a water outlet pipe of the water pump is connected with the bottom of the chemical material tank, a third water outlet branch pipe is arranged on one side of the water outlet pipe, and valves are arranged on the water inlet pipe, the water outlet pipe, the water adding pipe, the blow-off pipe and the third water outlet branch pipe. Sewage and PAC in the tank body circularly flow through the water pump, a hydraulic stirring effect is formed, the occupied area is reduced, the manufacturing cost and the maintenance cost are reduced, meanwhile, the dissolving efficiency and the mixing uniformity of the PAC are remarkably improved, and it is ensured that the PAC is fully dissolved and uniformly distributed in water.

Description

Technical Field

[0001] The invention belongs to the field of material chemical equipment, and in particular relates to a hydraulic stirring PAC material chemical device. Background Art

[0002] In the field of water treatment, polyaluminium chloride (PAC) is an efficient and economical flocculant. It has become the first choice for many water plants to treat sewage due to its excellent coagulation performance and wide application adaptability. The dissolution and mixing effect of PAC in the water treatment process directly determines the efficiency of subsequent flocculation and sedimentation and the quality of effluent water. Therefore, how to optimize the dissolution process of PAC and improve the dissolution efficiency and mixing uniformity has become an important issue to be solved in the current water treatment field.

[0003] However, when traditional water plants use PAC as a flocculant, they generally rely on a traditional stirring and dissolving system that combines a dissolving tank with a large agitator. Although this system can achieve the dissolution of PAC to a certain extent, its inherent limitations are becoming increasingly prominent. First of all, the traditional PAC dissolution system has a complex structure, consisting of a dissolution tank, a high-power agitator, a precisely metered pumping system, a control cabinet, and intricate pipe accessories. It not only occupies a large amount of valuable site resources, but also leads to a significant increase in manufacturing and maintenance costs. For water plants with limited resources or budgets, it is undoubtedly a huge burden.

[0004] More importantly, traditional agitators often have problems such as uneven stirring and insufficient turbulence during the stirring process. This results in low dissolution efficiency of PAC in the dissolution tank, and some PAC particles fail to fully dissolve, forming precipitation or stratification, which affects the subsequent flocculation effect. At the same time, the shear force generated during the stirring process may also cause the flocculation particles to break, further reducing the flocculation effect. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a hydraulic agitation PAC materializer, which can significantly improve the dissolution efficiency and mixing uniformity of PAC while reducing the floor space, manufacturing cost and maintenance cost, and ensure the full dissolution and uniform distribution of PAC in water, thereby laying a solid foundation for the subsequent flocculation and sedimentation process, and further improving the effluent quality and operation efficiency of the water plant.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A hydraulic stirring PAC feeder comprises a base, on which a feed tank is mounted, the feed tank comprises a tank body, a water filling pipe is arranged on one side of the upper part of the tank body, sewage to be treated is injected into the tank body from the water filling pipe, a sewage discharge pipe is arranged at the lower part of the tank body, and flocculants are discharged from the sewage discharge pipe; a medicine storage box is arranged on the upper part of the tank body, the medicine storage box comprises a box body, and a plurality of evenly arranged feeding pipes are arranged between the tank body and the box body; a water pump is arranged on one side of the feed tank, a water inlet pipe of the water pump is connected to the upper part of the feed tank, a water outlet pipe of the water pump is connected to the bottom of the feed tank, a third water outlet branch is arranged on one side of the water outlet pipe, and valves are arranged on the water inlet pipe, the water outlet pipe, the water filling pipe, the sewage discharge pipe and the third water outlet branch.

[0008] Furthermore, a first water outlet branch pipe and a second water outlet branch pipe are connected to one side of the water outlet pipe, the first water outlet branch pipe is connected to the bottom of the tank body, and the second water outlet branch pipe extends upward from the bottom of the tank body to above the water surface of the sewage.

[0009] Furthermore, the first water outlet branch pipe is tangentially connected to the front of the tank body, the water inlet pipe is tangentially connected to the rear of the tank body, and a spiral guide plate is provided on the inner wall of the tank body.

[0010] Furthermore, a nozzle is provided on the upper portion of the second water outlet branch pipe, and a plurality of water spray holes are provided outside the nozzle.

[0011] Furthermore, the nozzle is rotatably connected to the upper end of the second water outlet branch pipe through a rotating joint, and a plurality of baffles are fixedly connected to the outside of the nozzle, and the lower ends of the baffles extend into the sewage.

[0012] Furthermore, a heat-insulating layer is disposed outside the tank body, and a heating device is disposed inside the heat-insulating layer. The heating device includes but is not limited to an electric heating wire or a steam pipe.

[0013] Furthermore, a stirring shaft is provided inside the box body, a plurality of first stirring blades are provided on the stirring shaft, a driving box is provided on the upper part of the box body, a driving motor is provided on the upper part of the driving box, and an output shaft of the driving motor is connected to the stirring shaft.

[0014] Furthermore, a central gear is provided inside the driving box, the upper part of the central gear is connected to the driving motor, the lower part of the central gear is connected to the stirring shaft, a plurality of planetary gears are meshed on the outer side of the central gear, the lower part of the planetary gear is connected to a rotating shaft, a plurality of second stirring blades are connected to the rotating shaft, and the second stirring blades and the first stirring blades are arranged alternately in the vertical direction.

[0015] Furthermore, a spiral blade is connected to the lower end of the rotating shaft, and the spiral blade is arranged in the feeding pipe.

[0016] Furthermore, a first bypass pipe and a second bypass pipe are connected to one side of the third water outlet branch pipe, and a valve and a filter are respectively provided on the first bypass pipe and the second bypass pipe, and the two filters are one for use and one for backup.

[0017] The beneficial effects of the present invention are:

[0018] 1) The present invention utilizes a water pump to circulate the sewage and PAC in the tank body to form a hydraulic stirring effect, which significantly improves the dissolution efficiency and mixing uniformity of PAC while reducing the floor space, manufacturing cost and maintenance cost, and ensures that PAC is fully dissolved and evenly distributed in water.

[0019] 2) A first outlet branch pipe and a second outlet branch pipe are arranged on one side of the outlet pipe, and the second outlet branch pipe extends upward from the bottom of the tank to above the surface of the sewage; the sewage is directly introduced into the bottom of the tank through the first outlet branch pipe and preliminarily mixed with the sewage in the tank. At the same time, the second outlet branch pipe sprinkles the sewage from the upper part of the tank to form a spraying effect. This top-down combined water inlet method greatly promotes the all-round and multi-level mixing of PAC and sewage, ensures the uniformity of mixing, and improves the coagulation effect.

[0020] 3) The first outlet branch is tangentially connected to the front of the tank body, the water inlet pipe is tangentially connected to the rear of the tank body, and a spiral guide plate is arranged inside the tank body, so that after the sewage flows out from the first outlet branch, a vortex is formed inside the tank body. This vortex not only enhances the turbulent mixing between the sewage and the PAC, but also promotes the full contact between the suspended matter, colloids and other pollutants in the sewage and the PAC particles. The vortex effect not only promotes mixing, but also helps the flocs in the sewage to grow gradually during the rotation process; thereby improving the rate and efficiency of the coagulation reaction.

[0021] 4) The upper part of the second water outlet branch pipe is connected to the nozzle through a rotating joint, and a number of baffles are set outside the nozzle. The sewage sprayed down forms convection with the water flow from bottom to top in the tank. During the material mixing process, the sewage forms a vortex inside the tank, which drives the baffle to rotate, and then drives the nozzle to rotate. This design makes the spraying process not just a simple static spraying, but a dynamic and active mixing method, which promotes the mixing uniformity of PAC and sewage.

[0022] 5) By setting up an insulation layer outside the tank and installing a built-in heating device, the temperature of the sewage in the tank can be effectively controlled and maintained. For coagulants such as PAC, the coagulation effect is often affected by the water temperature. By adjusting the water temperature through a heating device, the coagulation reaction can be ensured to proceed within the optimal temperature range, thereby improving the coagulation efficiency and effluent water quality.

[0023] 6) A stirring shaft is arranged inside the box, a first stirring blade is arranged on the stirring shaft, a rotating shaft is also arranged inside the box, a second stirring blade is arranged on the rotating shaft, and the stirring shaft and the rotating shaft are connected through a planetary gear system, so that the rotation of the stirring shaft drives the planetary gear and the second stirring blade to rotate in the opposite direction. This composite stirring method not only increases the layering and complexity of stirring, but also enables PAC to be stirred more comprehensively and fully in the box. The staggered arrangement of the first stirring blade and the second stirring blade in the vertical direction further enhances the uniformity and efficiency of stirring, and effectively avoids the agglomeration of PAC.

[0024] 7) A spiral blade is provided at the lower end of the rotating shaft. The spiral blade is provided in the feeding pipe. The spiral blade not only avoids the blockage of the pipe mouth of the feeding pipe, but also helps to accurately control the feeding amount of PAC and ensure the slow coagulation effect of sewage.

[0025] 8) A first bypass pipe and a second bypass pipe are arranged on one side of the third water outlet branch pipe. A valve and a filter are respectively arranged on the first bypass pipe and the second bypass pipe, which effectively prevents the flocculants that are not completely precipitated from flowing out of the third water outlet branch pipe and entering the subsequent treatment equipment, thereby avoiding the flocculants from clogging or damaging the subsequent equipment. The two filters are used in one and the other is reserved, so that one of the filters can be replaced or maintained without stopping the system, thereby improving the flexibility and reliability of the system, reducing the downtime caused by filter maintenance, and ensuring the continuous operation of the treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Attached Figure 1 It is a structural schematic diagram of a hydraulic stirring PAC materializer of the present invention.

[0027] Attached Figure 2 It is a schematic diagram of the assembly of a chemical tank and a medicine storage box in a hydraulic stirring PAC chemical feeder of the present invention.

[0028] Attached Figure 3 It is a schematic diagram of the interior of a material tank in a hydraulic stirring PAC materializer of the present invention.

[0029] Attached Figure 4 It is a schematic diagram of the second water outlet branch pipe in a hydraulic stirring PAC materializer of the present invention.

[0030] Attached Figure 5 It is a schematic diagram of the interior of a medicine storage box in a hydraulic stirring PAC materializer of the present invention.

[0031] Attached Figure 6 It is a schematic diagram of a water pump in a hydraulic stirring PAC materializer of the present invention.

[0032] In the figure, 1, base; 2, chemical tank; 21, first water outlet branch; 22, second water outlet branch; 221, rotary joint; 222, nozzle; 223, baffle; 23, water inlet pipe; 24, water adding pipe; 25, sewage pipe; 26, tank body; 27, insulation layer; 28, feeding pipe; 29, spiral guide plate; 3, medicine storage box; 31, box body; 32, stirring shaft; 33, first stirring blade; 34, rotating shaft; 35, second stirring blade; 36, spiral blade; 4, driving box; 41, central gear; 42, planetary gear; 43, driving motor; 5, water pump; 51, water outlet pipe; 52, third water outlet branch; 53, first bypass pipe; 54, second bypass pipe; 55, filter. DETAILED DESCRIPTION

[0033] The following will be combined with the attached Figure 1-Figure 6 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] like Figure 1 As shown, a hydraulic stirring PAC materializer comprises a base 1, on which a material tank 2 is mounted. Figure 3 As shown, the chemical tank 2 includes a tank body 26, a water supply pipe 24 is provided on one side of the upper part of the tank body 26, and the sewage to be treated is injected into the tank body 26 from the water supply pipe 24. A sewage discharge pipe 25 is provided at the lower part of the tank body 26, and the flocculants are discharged from the sewage discharge pipe 25; Figure 2 As shown, a medicine storage box 3 is provided on the upper part of the tank body 26, and the medicine storage box 3 includes a box body 31. Figure 3 As shown, a plurality of evenly distributed feeding pipes 28 are provided between the tank body 26 and the box body 31, and the plurality of evenly distributed feeding pipes 28 ensure the uniformity of PAC feeding; Figure 6As shown, a water pump 5 is provided on one side of the chemical tank 2, a water inlet pipe 23 of the water pump 5 is connected to the upper part of the chemical tank 2, a water outlet pipe 51 of the water pump 5 is connected to the bottom of the chemical tank 2, a third water outlet branch pipe 52 is provided on one side of the water outlet pipe 51, and valves are provided on the water inlet pipe 23, the water outlet pipe 51, the water filling pipe 24, the sewage pipe 25 and the third water outlet branch pipe 52.

[0036] During water treatment, sewage is injected into the tank body 26, and then PAC is added to multiple directions of the tank body 26 through the medicine storage box 3 on the upper part of the tank body 26. At the same time, the water pump 5 is started, and the water inlet pipe 23 of the water pump 5 draws out the sewage in the tank body 26 and injects the sewage into the bottom of the tank body 26 again through the water outlet pipe 51, so that the sewage forms a cycle in the tank body 26 under the action of the water pump 5, while reducing the occupied area, manufacturing cost and maintenance cost, the dissolution efficiency and mixing uniformity of PAC are significantly improved, ensuring the full dissolution and uniform distribution of PAC in water.

[0037] like Figure 2 As shown, one side of the water outlet pipe 51 is connected to a first water outlet branch pipe 21 and a second water outlet branch pipe 22, and the first water outlet branch pipe 21 is connected to the bottom of the tank body 26. Figure 3 As shown, the second water outlet branch pipe 22 extends upward from the bottom of the tank body 26 to the surface of the sewage; the sewage is directly introduced into the bottom of the tank body 26 through the first water outlet branch pipe 21 and preliminarily mixed with the sewage in the tank. At the same time, the second water outlet branch pipe 22 sprinkles the sewage from the upper part of the tank body 26 to form a spray effect. This top-down combined water inlet method greatly promotes the all-round and multi-level mixing of PAC and sewage, ensures the uniformity of mixing, and improves the coagulation effect.

[0038] like Figure 2 As shown, the first outlet branch pipe 21 is tangentially connected to the front of the tank body 26, so that after the sewage flows out of the first outlet branch pipe 21, a vortex is formed inside the tank body 26. This vortex not only enhances the turbulent mixing between the sewage and the PAC, but also promotes the full contact between the suspended matter, colloids and other pollutants in the sewage and the PAC particles. The vortex effect not only promotes mixing, but also helps the flocs in the sewage to gradually grow during the rotation process; thereby improving the rate and efficiency of the coagulation reaction; the water inlet pipe 23 is tangentially connected to the rear of the tank body 26, and the water inlet pipe 23 and the first outlet pipe 51 are installed in the up and down, left and right directions of the tank body 26, and are both tangentially connected to the tank body 26, further ensuring the vortex effect of the sewage inside the tank body 26. As shown Figure 3As shown, a spiral guide plate 29 is provided on the inner wall of the tank body 26. After the sewage flows into the tank body 26 tangentially, it is guided by the spiral guide plate 29 and forms a strong vortex along the inner wall of the tank body 26. This design not only prolongs the flow path of the sewage in the tank body 26, but also increases the contact time and contact area between the sewage and the PAC, thereby significantly enhancing the vortex effect and improving the mixing efficiency. In addition, the design of the spiral guide plate 29 enables the sewage to form a stable and continuous vortex in the tank body 26, avoiding the mixing dead angle that may occur in the traditional stirring method.

[0039] like Figure 4 As shown, a nozzle 222 is provided on the upper part of the second water outlet branch pipe 22, and a plurality of water spray holes are provided on the outside of the nozzle 222. The sewage sprayed down forms convection with the water flow from bottom to top in the tank body 26, so that the spraying effect is more uniform, covering a wider area on the upper part of the tank body 26, thereby further promoting the mixing uniformity of PAC and sewage.

[0040] like Figure 4 As shown, the nozzle 222 is rotatably connected to the upper end of the second water outlet branch pipe 22 through a rotating joint 221. A plurality of baffles 223 are fixedly connected to the outside of the nozzle 222. The lower end of the baffle 223 extends into the sewage. After the sewage forms a vortex inside the tank 26, the baffle 223 is pushed to rotate, thereby driving the nozzle 222 to rotate. This design makes the spraying process not just a simple static spraying, but a dynamic and active mixing method. The rotation of the nozzle 222 makes the coverage of the sewage spraying wider, and the spraying direction is constantly changing, thereby avoiding the problem of uneven local mixing. At the same time, the existence of the baffle 223 further disrupts the structure of the vortex, so that the particles in the sewage and the PAC can contact and collide more fully, thereby improving the uniformity of mixing. Since the rotation of the nozzle 222 is achieved by relying on the kinetic energy of the vortex, no additional power source is required, thereby reducing the energy consumption of the system.

[0041] like Figure 3 As shown, the tank body 26 is provided with an insulation layer 27 on the outside, and a heating device is provided inside the insulation layer 27, and the heating device includes but is not limited to an electric heating wire or a steam pipe; by providing the insulation layer 27 on the outside of the tank body 26 and the built-in heating device, the temperature of the sewage in the tank body 26 can be effectively controlled and maintained. For coagulants such as PAC, their coagulation effect is often affected by water temperature. By adjusting the water temperature through the heating device, it can be ensured that the coagulation reaction is carried out within the optimal temperature range, thereby improving the coagulation efficiency and the effluent water quality.

[0042] like Figure 5As shown, a stirring shaft 32 is provided inside the box body 31, and a plurality of first stirring blades 33 are provided on the stirring shaft 32. A driving box 4 is provided on the upper part of the box body 31, and a driving motor 43 is provided on the upper part of the driving box 4. The output shaft of the driving motor 43 is connected to the stirring shaft 32. The stirring shaft 32 is used to stir the PAC in the medicine storage box 3 to avoid PAC agglomeration. Keeping the PAC in a loose state helps it to be better dissolved and dispersed in the sewage, thereby improving the coagulation effect.

[0043] like Figure 5 As shown, a central gear 41 is provided inside the driving box 4, the upper part of the central gear 41 is connected to the driving motor 43, the lower part of the central gear 41 is connected to the stirring shaft 32, a plurality of planetary gears 42 are meshed on the outer side of the central gear 41, a rotating shaft 34 is connected to the lower part of the planetary gear 42, a plurality of second stirring blades 35 are connected to the rotating shaft 34, and the second stirring blades 35 are staggered with the first stirring blades in the vertical direction; by arranging the meshing transmission mechanism of the central gear 41 and the planetary gear 42 inside the driving box 4, the rotation of the stirring shaft 32 is realized while driving the reverse rotation of the planetary gear 42 and the second stirring blade 35. This composite stirring method not only increases the layering and complexity of the stirring, but also enables the PAC to be more comprehensively and fully stirred in the box body 31. The staggered arrangement of the first stirring blade and the second stirring blade 35 in the vertical direction further enhances the uniformity and efficiency of the stirring, and effectively avoids the agglomeration of the PAC.

[0044] like Figure 5 As shown, the lower end of the rotating shaft 34 is connected to a spiral blade 36, and the spiral blade 36 is arranged in the feeding pipe 28. The spiral blade 36 not only avoids the blockage of the pipe mouth of the feeding pipe 28, but also helps to accurately control the feeding amount of PAC and ensure the slow coagulation effect of sewage.

[0045] like Figure 6 As shown, one side of the third water outlet branch pipe 52 is connected to a first bypass pipe 53 and a second bypass pipe 54. The first bypass pipe 53 and the second bypass pipe 54 are respectively provided with a valve and a filter 55, which effectively prevents incompletely precipitated floccules from flowing out of the third water outlet branch pipe 52 and entering subsequent treatment equipment, thereby avoiding blockage or damage to subsequent equipment caused by the floccules. The two filters 55 are used in one and reserved in the other, so that one of the filters 55 can be replaced or maintained without stopping the system, thereby improving the flexibility and reliability of the system, reducing the downtime caused by the maintenance of the filter 55, and ensuring the continuous operation of the treatment system.

[0046] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A hydraulic stirring PAC feeder, comprising a base, a feed tank is mounted on the base, the feed tank comprises a tank body, a water supply pipe is arranged on one side of the upper part of the tank body, the sewage to be treated is injected into the tank body from the water supply pipe, a sewage discharge pipe is arranged at the lower part of the tank body, and flocculants are discharged from the sewage discharge pipe; a medicine storage box is arranged at the upper part of the tank body, the medicine storage box comprises a box body, and a plurality of evenly arranged feeding pipes are arranged between the tank body and the box body; characterized in that: A water pump is provided on one side of the chemical tank, a water inlet pipe of the water pump is connected to the upper part of the chemical tank, a water outlet pipe of the water pump is connected to the bottom of the chemical tank, a third water outlet branch is provided on one side of the water outlet pipe, and valves are provided on the water inlet pipe, water outlet pipe, water filling pipe, sewage pipe and the third water outlet branch.

2. A hydraulic stirring PAC materializer according to claim 1, characterized in that: One side of the water outlet pipe is connected with a first water outlet branch pipe and a second water outlet branch pipe, the first water outlet branch pipe is communicated with the bottom of the tank body, and the second water outlet branch pipe extends upward from the bottom of the tank body to above the water surface of the sewage.

3. A hydraulic stirring PAC materializer according to claim 2, characterized in that: The first water outlet branch pipe is tangentially connected to the front of the tank body, the water inlet pipe is tangentially connected to the rear of the tank body, and a spiral guide plate is provided on the inner wall of the tank body.

4. A hydraulic stirring PAC materializer according to claim 3, characterized in that: A spray head is arranged on the upper part of the second water outlet branch pipe, and a plurality of spray holes are arranged outside the spray head.

5. A hydraulic stirring PAC materializer according to claim 4, characterized in that: The nozzle is rotatably connected to the upper end of the second water outlet branch pipe through a rotating joint, and a plurality of baffles are fixedly connected to the outside of the nozzle, and the lower ends of the baffles extend into the sewage.

6. The hydraulic stirring PAC materializer according to claim 1, characterized in that: The tank body is provided with an insulation layer on the outside, and a heating device is provided inside the insulation layer. The heating device includes but is not limited to an electric heating wire or a steam pipe.

7. The hydraulic stirring PAC materializer according to claim 1, characterized in that: A stirring shaft is arranged inside the box body, a plurality of first stirring blades are arranged on the stirring shaft, a driving box is arranged on the upper part of the box body, a driving motor is arranged on the upper part of the driving box, and an output shaft of the driving motor is connected to the stirring shaft.

8. A hydraulic stirring PAC materializer according to claim 7, characterized in that: A central gear is provided inside the driving box, the upper part of the central gear is connected to the driving motor, the lower part of the central gear is connected to the stirring shaft, a plurality of planetary gears are meshed on the outer side of the central gear, the lower part of the planetary gear is connected to a rotating shaft, a plurality of second stirring blades are connected to the rotating shaft, and the second stirring blades and the first stirring blades are arranged alternately in the vertical direction.

9. A hydraulic stirring PAC materializer according to claim 8, characterized in that: The lower end of the rotating shaft is connected with a spiral blade, and the spiral blade is arranged in the feeding pipe.

10. A hydraulic stirring PAC materializer according to any one of claims 1 to 9, characterized in that: The third water outlet branch pipe is connected to a first bypass pipe and a second bypass pipe on one side. The first bypass pipe and the second bypass pipe are respectively provided with a valve and a filter, and the two filters are one for use and one for backup.

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