Reaction pool structure and silt discharging process for water purification plant

Abstract

This invention provides a structure and sludge removal process for a reaction tank in a water purification plant, belonging to the field of water purification, and solves the problem of how to collect sludge from the bottom of a sedimentation tank without shutting down the plant. It includes a central collector comprising a collection pipe and a pusher; internally, it has a cross-connected sludge collection channel and a backwashing channel, with a valve core rotating at their intersection. The valve core has a through-channel with a collection filter screen. The on / off states of the sludge collection channel and the backwashing channel are opposite and switched by the rotation angle of the valve core. The collection pipe of the bottom wall collector extends from the central collector along the generatrix of the conical bottom of the tank to the side wall. The collection pipe has an arc-shaped cross-section with its opening facing the circumference of the tank. The pusher is slidably disposed inside the collection pipe. The inlet of the sludge collection channel is connected to the collection pipe, and the outlet has a drain port with an opening and closing mechanism. The inlet of the backwashing channel is connected to a pressurized water source, and the outlet has a sludge discharge port. This invention achieves the technical effect of collecting sludge from the bottom of the sedimentation tank without shutting down the plant.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, specifically to the structure of the reaction tank in a water purification plant and the sludge removal process. Background Technology

[0002] In the field of water purification, sedimentation tanks are key structures in the reaction tank system of water purification plants, undertaking the core function of solid-liquid separation. Through gravity settling, they separate suspended particles, silt, and flocculated impurities with a density greater than water from the water body. This is a crucial step in ensuring stable effluent quality and reducing the load on advanced treatment units. Currently, most mainstream sedimentation tanks adopt a tank structure with a conical bottom, relying on the functional zoning of the influent zone, sedimentation zone, buffer zone, sludge zone, and effluent zone to achieve sludge-water separation.

[0003] Currently, the conventional sludge collection solutions at the bottom of sedimentation tanks in the industry generally adopt a structural design with a rotating scraper at the bottom of the tank. For example, the Chinese patent application with publication number CN121754925A, entitled "A Center-Inlet and Circumferential Outlet Radial Flow Dual-Zone Sedimentation Tank", uses a drive device to drive the scraper to make a circular motion along the conical surface of the bottom of the tank, gradually scraping and pushing the sludge settled on the bottom surface of the tank. Combined with the sludge's own gravity, it naturally slides down the slope of the conical surface and finally gathers in the sludge collection area at the center of the bottom of the cone, thus completing the initial collection of sludge on the tank surface.

[0004] This type of sludge collection method, which relies on mechanical scraping combined with gravity drainage, can achieve basic sludge collection under normal water purification conditions and is currently the mainstream sludge collection technology. However, existing sludge collection structures still have significant technical limitations in actual operation: conventional sludge discharge operations require the entire water purification system to be shut down and the pool water drained before sludge removal can be carried out. This not only directly interrupts the continuous water supply process, causing a significant loss of water supply capacity, but also easily causes fluctuations in water quality within the pool during the emptying process, impacting subsequent treatment units; even if some pressurized sludge discharge structures can achieve sludge discharge while water is present, it is difficult to complete the efficient collection of sludge at the bottom of the pool without disturbing the normal water flow in the sedimentation tank, and it is impossible to truly achieve continuous sludge removal operations without shutting down the system. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes a reaction tank structure and sludge removal process for water purification plants, which solves the technical problem of how to collect sludge from the bottom of sedimentation tanks without shutting down the plant.

[0006] The technical solution adopted in this invention is the structure of the reaction tank in a water purification plant and the sludge removal process.

[0007] The water purification plant reaction tank structure includes: a tank body with a circular sidewall and a conical bottom, a centrally located collector rotatably positioned at the center of the bottom of the tank body, and a bottom wall collector, which includes a collection pipe and a pusher; the centrally located collector has a cross-connected sludge collection channel and a backwashing channel inside, and a valve core is rotatably located at the intersection of the two, the valve core having a through channel with a collection filter screen, the on / off states of the sludge collection channel and the backwashing channel are opposite and switched by the rotation angle of the valve core; one end of the collection pipe is fixed to the centrally located collector, and the other end extends along the generatrix of the conical bottom of the tank body to the sidewall of the tank body, the collection pipe has an open arc cross section, and the opening direction faces the circumference of the tank body, the pusher is slidably located inside the collection pipe and the sliding position can be controlled; the inlet end of the sludge collection channel is connected to the collection pipe, and the outlet end has a drain outlet with an opening and closing mechanism, the inlet end of the backwashing channel is connected to a pressurized water source, and the outlet end has a sludge discharge port.

[0008] Optionally, the collecting pipe has a semi-circular cross-section, the lower edge of the collecting pipe slides in contact with the conical inclined surface at the bottom of the pool, and a collecting filter is provided on the rear side of the collecting pipe.

[0009] Optionally, the pusher is slidably disposed on the inner arc side of the collecting tube, the pusher is provided with a drive frame that wraps around the back arc side of the collecting tube, the beginning and end of the collecting tube are respectively provided with a first support and a second support, a drive mechanism is provided between the first support and the second support, and the drive mechanism is connected to the drive frame and controls its sliding position.

[0010] Optionally, the opening and closing mechanism includes a first conical surface, a second conical surface, and an elastic element. The first conical surface is disposed on the inner side of the outlet end of the sludge collection channel, and the second conical surface is disposed on a piston body that can slide within the outlet end of the sludge collection channel. The elastic element abuts against the side of the piston body opposite to the first conical surface. Initially, the elastic element allows the first and second conical surfaces to contact and close the outlet end of the sludge collection channel. When there is pressure from the inlet end to the outlet end in the sludge collection channel, the first and second conical surfaces separate and connect the inlet end and the outlet end of the sludge collection channel.

[0011] Optionally, the cross-connection area between the sludge collection channel and the backwashing channel is a spherical or disc-shaped cavity. The shape of the valve core matches and rotates with the cross-connection area. Initially, the axis of the through channel of the valve core is aligned with the axis of the sludge collection channel and connects to the sludge collection channel. After the valve core rotates a certain angle, the axis of the through channel of the valve core is aligned with the axis of the backwashing channel and connects to the backwashing channel. The valve core is provided with an extended control shaft, which is connected to a power source.

[0012] Optionally, on the valve core, the collecting filter screen is disposed at one end of the through channel, and the through channel and the collecting filter screen form a barrel-shaped structure.

[0013] Optionally, the central collector is provided with a sedimentation inlet pipe, the lower end of which is the inlet end and the upper end of which is the outlet end. The side wall of the outlet end is provided with radial water distribution holes, and the top of the circumferential side wall of the pool is provided with an outlet area.

[0014] Optionally, the outlet of the sludge collection channel is connected to the sedimentation inlet pipe, the inlet of the backwashing channel is connected to the sedimentation inlet pipe, and a booster pump and an on / off valve are provided between the two.

[0015] Optionally, the central collector is provided with a sludge storage chamber, and the sludge discharge port at the outlet of the backwashing channel is connected to the sludge storage chamber.

[0016] The sludge removal process of the reaction tank in the water purification plant, using the reaction tank structure described above, includes the following steps:

[0017] Collection steps: Inside the collection tube, the pusher is located at the end away from the central collector. The central collector drives the collection tube to rotate against the bottom conical surface of the pool and scrapes the settled sludge into the collection tube. At the intersection of the sludge collection channel and the backwashing channel, the valve core cuts off the sludge collection channel.

[0018] Collection steps: The pusher moves along the collection pipe and pushes the sludge in the collection pipe into the inlet of the sludge collection channel. Then, at the intersection of the sludge collection channel and the backwashing channel, the valve core connects to the sludge collection channel. The pusher continues to move and squeeze the inlet of the sludge collection channel. The mud-water mixture passes through the collection filter screen of the valve core. The sludge is trapped in the valve core. The water passes through the filter screen and is squeezed to open the opening and closing mechanism for discharge.

[0019] Cleaning steps: At the intersection of the sludge collection channel and the backwashing channel, the valve core cuts off the sludge collection channel and opens the backwashing channel. High-pressure water flows in the opposite direction through the valve core and its collection filter screen, and discharges the sludge trapped on the collection filter screen.

[0020] As can be seen from the above technical solution, the beneficial technical effects of the present invention are as follows:

[0021] With a valve core that can switch on and off states, and an open collection pipe laid along the bottom of the cone, the sedimentation tank can be stably collected and exported by a pusher without interrupting the normal water inlet and outlet process. The entire process does not require stopping the machine to empty the tank water, which avoids water supply interruption losses caused by water outages. The dual-channel switching structure effectively prevents water backflow, greatly improving the efficiency of sediment collection and the stability of operation in continuous water purification scenarios. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of the overall cross-section of the sedimentation tank.

[0024] Figure 2 This is a partial cross-sectional diagram of the central collector.

[0025] Figure 3 This is a top view of the central collector and the bottom wall collector.

[0026] Figure 4 for Figure 3 Schematic diagram of section AA.

[0027] Figure 5 This is a schematic diagram of the external shape of the sludge collection channel and the backwashing channel.

[0028] Figure 6 A schematic diagram showing the connection between the valve core of the centrally located collector and the sludge collection channel.

[0029] Figure 7 A schematic diagram showing the connection between the valve core of the centrally located collector and the backwashing channel.

[0030] Figure 8 This is a partial schematic diagram of the bottom wall collector and pusher.

[0031] Figure 9 This is a schematic diagram of a portion of the bottom wall collector and another view of the pusher.

[0032] Reference numerals: Pool body 1, Outlet area 11, Conical inclined surface 12, Sludge pool 13, Rotary joint 14, Inlet pipe 15, Channel bridge 16, Central collector 2, Sludge collection channel 21, Drain outlet 211, First conical surface 212, Piston body 213, Second conical surface 2131, Elastic element 214, Backwash channel 22, Pressurized water source 221, Sludge discharge port 222, Booster pump 223, On / off valve 224, Valve core body 23, Collection filter screen 231, Through channel 232, Control shaft 233, Sludge temporary storage chamber 24, Sedimentation inlet pipe 25, Water distribution hole 251, Bottom wall collector 3, Collection pipe 31, Collection filter screen 311, First support 312, Second support 313, Drive mechanism 314, Pusher 32, Drive frame 321. Detailed Implementation

[0033] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0034] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0035] In existing technology, the core of the sedimentation tank is the tank body 1, which is integrally cast with reinforced concrete. The upper part is a vertical cylindrical structure with circular sidewalls. The top is surrounded by an outlet area 11 along the inner circumference of the tank body, usually equipped with an overflow weir and a collection trough to evenly collect the clarified water after sedimentation, ensuring a stable effluent water level and uniform water flow distribution. The lower part of the tank body 1 is a converging conical slope 12, with a reasonable slope set according to engineering design specifications. This allows the settled sludge to converge towards the bottom center by its own weight, preventing sludge from adhering and accumulating on the slope to form dead zones. At the bottom of the tank body 1, a sludge collection area is set up to temporarily store the high-concentration settled sludge that slides down from the conical slope 12, reducing the frequency of sludge removal operations. A passageway bridge 16 is set across the top of the pool body 1, serving as a passageway for maintenance personnel to conduct daily inspections and equipment maintenance. The bridge can be equipped with auxiliary facilities such as drive devices and monitoring instruments. The entire structure achieves conventional gravity mud-water separation operations through the functional zoning of the water inlet zone, sedimentation zone, buffer zone, and sludge zone. It is currently the most widely used solid-liquid separation structure in the field of water purification.

[0036] During the sedimentation process in the sedimentation tank, after the reagents added in the front-end coagulation process have fully reacted, the raw water slowly flows in from the inlet pipe at the bottom of the tank and is evenly diffused into the water body in the tank through the radial water distribution holes at the top. Relying on gravity and the density difference of the water, it gradually sinks under a gentle and stable laminar flow state. Large particles of impurities settle quickly and adhere to the conical inclined surface of the tank, slowly accumulating along the slope to the sludge storage area at the bottom. The clarified water that has completed solid-liquid separation in the upper layer rises steadily to the outlet area at the top of the tank. After being evenly collected by the overflow weir, it is sent to the subsequent deep treatment unit. The entire process efficiently completes the gravity separation of suspended impurities in the water without disturbing the flow state in the sedimentation zone, providing low-turbidity inlet water conditions for subsequent filtration and disinfection processes.

[0037] For the structure of the reaction tank in the water purification plant in this plan, please refer to the appendix. Figure 1 It includes: a pool body 1 with circumferential sidewalls and a conical bottom, and a centrally located collector 2 rotatably disposed at the center of the bottom of the pool body 1. In one possible embodiment, it also includes a bottom wall collector 3, combined with... Figure 3 and Figure 4 The bottom wall collector 3 includes a collection tube 31 and a pusher 32; see also Figure 2 or Figure 6 and Figure 7 The central collector 2 has a cross-connected sludge collection channel 21 and a backwashing channel 22 inside, and a valve core 23 is rotatably installed at the intersection of the two. The valve core 23 has a through channel 232 with a collection filter screen 231. The opening and closing states of the sludge collection channel 21 and the backwashing channel 22 are opposite and are switched by the rotation angle of the valve core 23. When one channel is open, the other channel is closed. One end of the collection pipe 31 is fixed to the central collector 2, and the other end extends to the pool body along the generatrix of the conical bottom of the pool body 1. The side wall of the pool 1 has a collection pipe 31 with an open arc cross section and the opening direction is towards the circumference of the pool 1. During its rotation, it can scrape along the conical inclined surface 12 at the bottom of the pool 1. The pusher 32 is slidably installed in the collection pipe 31 and the sliding position can be controlled. The inlet of the sludge collection channel 21 is connected to the collection pipe 31, and the outlet is provided with a drain port 211. The drain port 211 is provided with an opening and closing mechanism, which can open or close the passage as needed. The inlet of the backwash channel 22 is connected to the pressure water source 221, and the outlet is provided with a sludge discharge port 222.

[0038] Correspondingly, the sludge removal process of the reaction tank in a water purification plant can be implemented in one of the following ways: using the above-mentioned reaction tank structure, the process includes the following steps:

[0039] Collection steps: Inside the collection pipe 31, the pusher 32 is located at the end furthest from the central collector 2. The central collector 2 drives the collection pipe 31 to rotate against the bottom conical surface of the pool body 1, scraping the settled sludge into the collection pipe 31. After the sludge enters the collection pipe 31, it will also spontaneously flow along the axial direction of the collection pipe 31 towards the lower-positioned central collector 2. Inside the central collector 2, at the intersection of the sludge collection channel 21 and the backwash channel 22, the valve core 23 cuts off the sludge collection channel 21, meaning that the sludge can flow into... Figure 7 The sludge can be discharged through the valve core 23 in the sludge collection channel 21 shown, but due to the obstruction of the valve core 23, the sludge cannot be discharged through the valve core 23 and can only accumulate in the sludge collection channel 21.

[0040] Once the silt in the silt collection channel 21 has accumulated to a certain amount, the collection process begins.

[0041] Collection Steps: The pusher 32 moves along the collection pipe 31 and actively pushes the sludge that does not automatically flow into the sludge collection channel 21 into the inlet of the sludge collection channel 21. (See reference...) Figure 5 Once the pusher 32 moves to the side of the central collector 2 and inserts into the sludge collection channel 21, the inlet of the sludge collection channel 21 forms a sealed space under the combined sealing action of the valve core 23 and the pusher 32. The space is mainly filled with sludge and water. Just after the pusher 32 moves to block the sludge collection channel 21, at the intersection of the sludge collection channel 21 and the backwash channel 22, the valve core 23... Figure 7 The state shown is rotated to Figure 6 In the indicated state, valve core 23 is connected to sludge collection channel 21. Pusher 32 continues to move and squeeze the inlet of sludge collection channel 21, increasing the internal pressure of sludge collection channel 21. The opening and closing mechanism at the outlet of sludge collection channel 21 is opened, and the mud-water mixture passes through the collection filter screen 231 of valve core 23. Sludge is trapped inside valve core 23, and water is discharged through the filter screen and squeezed to open the opening and closing mechanism.

[0042] Cleaning steps: At the intersection of the sludge collection channel 21 and the backwash channel 22, the valve core 23... Figure 6 The state shown has switched to Figure 7 In the aforementioned state, the valve core 23 cuts off the sludge collection channel 21 and opens the backwash channel 22. High-pressure water flows in the opposite direction through the valve core 23 and its collection filter 231, and discharges the sludge trapped on the collection filter 231.

[0043] After the cleaning step is completed, the pusher 32 leaves the central collector 2 and moves to the other end of the collection pipe 31. This process constitutes one work cycle. In actual production, repeating this process allows for continuous, non-stop sludge discharge without disturbing the bottom of the tank. In a preferred embodiment, after multiple collection and settling steps, once sufficient sludge has accumulated between the settling filter 231 and the pusher 32, the cleaning step is performed.

[0044] In summary, the above embodiment utilizes a valve core 23 with switchable on / off states inside the centrally located collector 2, along with an open arc-shaped collection pipe 31 arranged along the conical bottom generatrix of the tank body 1 and a controllable sliding pusher 32. This allows for the collection of sludge from the entire bottom of the sedimentation tank during continuous operation with normal water inflow and outflow, without requiring shutdown or emptying of the tank water. This structure relies on the alternating on / off switching logic of the sludge collection channel 21 and the backwashing channel 22, combined with the collection filter 231 on the valve core 23, to achieve efficient separation of mud and water and backwashing cleaning. This avoids disturbance to the sedimentation flow within the tank during the sludge removal process, preventing water supply interruption losses caused by conventional shutdown sludge removal, and significantly improving the efficiency of sludge collection and long-term operational stability in continuous water purification scenarios.

[0045] As a further embodiment of the above, please refer to Figure 1 A working space is provided on the lower side of the pool body 1, and a sludge tank 13 is set up within the working space to collect and contain sludge. When high-pressure water flows in the reverse direction through the backwash channel 22 and passes through the collecting filter 231, the sludge and backwash water are directly discharged into the sludge tank 13. The working space also serves as a space for various equipment, such as various pumps, electrical distribution boxes, etc. In a preferred embodiment, the sludge tank 13 is located on the lower side of the center of the conical bottom of the pool body 1, and the backwash water is directly received through the sludge tank 13.

[0046] In one possible implementation, see Appendix Figure 4The collecting pipe 31 has a semi-circular cross-section. The lower edge of the collecting pipe 31 slides in contact with the conical inclined surface 12 at the bottom of the pool body 1. A collecting filter screen 311 is provided on the rear side of the collecting pipe 31. That is to say, the arc-shaped pipe body of the collecting pipe 31 is not a solid sheet structure, but a mesh structure. This is because, during the process of the collecting pipe 31 sliding and scraping on the conical inclined surface 12 at the bottom of the pool body 1, it will scrape the sludge particles and water that have settled at the bottom of the pool body 1 into the collecting pipe 31. The front side of the collecting pipe 31 is the inlet of water and sludge. If its rear side is a closed structure, the scraping effect will not be ideal. Moreover, the rotational resistance of the collecting pipe 31 in the water is relatively large, and the power requirement of the equipment driving its rotation is higher. In this solution, by setting the back side of the collection pipe 31 as a filter screen structure, the purpose is to allow water to flow through while intercepting sludge inside the collection pipe 31. During the rotation of the collection pipe 31, the sludge is moved along the axis of the collection pipe 31 to the connection end between the collection pipe 31 and the central collector 2 by the automatic gravity of the sludge and the disturbance force generated by the rotation of the collection pipe 31, so as to carry out the next step of processing. In summary, the collection pipe 31 with a semi-circular cross-section and a collection filter screen 311 on the back side slides and scrapes along the conical inclined surface 12 of the pool body 1. It can both allow water to flow through the filter screen and be discharged during rotation, greatly reducing underwater rotational resistance and reducing the power requirements of the drive equipment, and effectively intercept sludge inside the pipe. Relying on the rotational disturbance force and gravity, the sludge is moved towards the connection end of the central collector 2, which improves the scraping and guiding efficiency of sludge at the bottom of the pool and reduces the disturbance of the pool water at the bottom by the plate scraper in the prior art.

[0047] In one possible implementation, see Appendix Figure 3 , Figure 4 and Figure 8The pusher 32 is slidably disposed on the inner arc side of the collecting tube 31. The pusher 32 has a drive frame 321 that winds around the back arc side of the collecting tube 31. The beginning and end of the collecting tube 31 are respectively provided with a first support 312 and a second support 313. A drive mechanism 314 is provided between the first support 312 and the second support 313. The drive mechanism 314 is connected to the drive frame 321 and controls its sliding position. In some possible embodiments, a motor is provided at the first support 312, the drive mechanism 314 is a lead screw, and the drive frame 321 has a threaded hole that cooperates with the lead screw structure of the drive mechanism 314. The first support 312 and the second support 313 simultaneously provide rotational support for the lead screw. The motor at the first support 312 drives the lead screw to rotate, thereby controlling the movement of the drive frame 321, i.e., the pusher 32. However, considering that the scenario in this solution is the bottom of a pool, in a more preferred embodiment, a stranding disc is provided inside the first support 312, and a fixed pulley is provided at the second support 313. The cable of the winch reel is first fixed to the winch reel, then extends along the back side of the collection pipe 31, is fixed to the drive frame 321 midway, reaches the second support 313, passes around the fixed pulley, and then extends in the opposite direction along the back side of the collection pipe 31 and returns to the first support 312 to be fixed to the winch reel. In this way, the direction of movement of the drive frame 321, i.e., the pusher 32, can be controlled by the rotation direction of the winch reel. In summary, the above cable drive scheme relies on the winch reel in the first support 312 and the fixed pulley at the second support 313 to form a closed-loop traction path, which can drive the drive frame 321 and the pusher 32 to slide back and forth along the collection pipe 31. It is suitable for complex underwater working conditions. Compared with the screw structure, the overall structure is simpler and more corrosion-resistant, with a lower failure rate during underwater operation, and can reliably realize the pushing and collection of silt at the bottom of the pool.

[0048] In one possible implementation, see Appendix Figure 6The opening and closing mechanism includes a first conical surface 212, a second conical surface 2131, and an elastic element 214. The first conical surface 212 is located on the inner side of the outlet of the sludge collection channel 21, and the second conical surface 2131 is located on the piston body 213, which can slide within the outlet of the sludge collection channel 21. The elastic element 214 abuts against the side of the piston body 213 opposite to the first conical surface 212. Initially, the elastic element 214 allows the first conical surface 212 and the second conical surface 2131 to contact and close the outlet of the sludge collection channel 21. When there is pressure from the inlet to the outlet of the sludge collection channel 21, the first conical surface 212 and the second conical surface 2131 separate and connect the inlet and outlet of the sludge collection channel 21. In the above embodiment, the specific working state is as follows: when the collecting pipe 31 rotates to scrape the bottom sludge, the pusher 32 is located at the higher end of the collecting pipe 31, that is, near the pool wall. Therefore, at the lower end of the collecting pipe 31, the collecting pipe 31 is directly connected to the sludge collection channel 21. The sludge in the collecting pipe 31 will automatically accumulate into the sludge collection channel 21. However, at the same time, the water pressure in the pool 1 will also act on the sludge collection channel 21. Therefore, the sludge collection channel 21 must be opened and closed in a controllable manner. The most direct way is to set a valve to close the outlet of the sludge collection channel 21 during the scraping process of the collecting pipe 31. The structure in this solution is used to mechanically synchronize the opening and closing state of the sludge collection channel 21 with the working state of the pusher 32. Once a certain amount of sludge accumulates in the sludge collection channel 21, the pusher 32 moves to the inlet of the sludge collection channel 21 and inserts itself into the sludge collection channel 21. As it continues to insert itself, the pressure inside the sludge collection channel 21 increases, thereby pushing the piston 213 to move and open the sludge collection channel 21. The sludge inside is trapped, while the water is discharged from the outlet of the sludge collection channel 21.

[0049] In one possible implementation, see Appendix Figure 6 The cross-connection area between the sludge collection channel 21 and the backwash channel 22 is a spherical or disc-shaped cavity. The shape of the valve core 23 matches and rotates with the cross-connection area. Initially, the axis of the through channel 232 of the valve core 23 is aligned with the axis of the sludge collection channel 21 and connects to the sludge collection channel 21. After the valve core 23 rotates a certain angle, the axis of the through channel 232 of the valve core 23 is aligned with the axis of the backwash channel 22 and connects to the backwash channel 22. The valve core 23 is provided with an extended control shaft 233, which is connected to a power source. Furthermore, a collection filter 231 is located at one end of the through channel 232 on the valve core 23. The through channel 232 and the collection filter 231 form a barrel-shaped structure to accommodate more sludge.

[0050] Based on the above embodiments, please refer to the appendix. Figure 1The central collector 2 has a sedimentation inlet pipe 25 at its center, which is the entry channel for the raw water to be treated. The lower end of the sedimentation inlet pipe 25 is the inlet end, and the upper end is the outlet end. Radial water distribution holes 251 are provided on the side wall of the outlet end. An outlet area 11 is provided on the top of the circumferential side wall of the tank body 1. The preceding part of this section describes existing technology. The improvement of this solution lies in the fact that the sedimentation inlet pipe 25 rotates together with the central collector 2, therefore... Figure 1 As shown, a rotary joint 14 is required to connect the sedimentation inlet pipe 25 and the external inlet pipe 15. The connection between the two is a rotary sealing fit, with the sedimentation inlet pipe 25 being the rotating end and the external inlet pipe 15 being the fixed end.

[0051] In the above embodiments, see Figure 2 The sludge settled on the conical inclined surface 12 in pool 1 is scraped into the collection pipe 31 as the central collector 2 rotates. It first spontaneously flows and accumulates towards the lower central collector 2, and then the pusher 32 pushes the remaining sludge into the sludge collection channel 21. Figure 6 After the pressure inside the channel increases, the opening and closing mechanism is opened. When the muddy water passes through the through channel 232 of the valve core 23, the sludge is intercepted by the collection filter screen 231 at the end, and the filtrate is discharged from the drain outlet 211. After filtration is completed, as follows... Figure 7 The valve core 23 rotates to switch channels, cutting off the sludge collection channel 21 and connecting the backwash channel 22 with the pressurized water source 221. The high-pressure water flow flows in the opposite direction into the barrel-shaped chamber with the filter screen, pushing the intercepted sludge out of the sludge discharge port 222 to the sludge pool 13. The entire process does not require stopping the machine to disturb the settling flow in the pool.

[0052] For further details, please refer to the appendix. Figure 1 The outlet 211 of the sludge collection channel 21 is connected to the sedimentation inlet pipe 25, and the inlet of the backwashing channel 22 is connected to the sedimentation inlet pipe 25. A booster pump 223 and an on / off valve 224 are installed between the two. This structure connects the outlet 211 of the sludge collection channel 21 and the inlet of the backwashing channel 22 to the sedimentation inlet pipe 25. Relying on the sedimentation inlet pipe 25, which rotates synchronously with the central collector 2, a dynamic seal connection is achieved with the external inlet pipe 15 through the rotary joint 14. No additional external independent pipeline is required, which greatly simplifies the underwater pipeline layout of the tank 1, reduces the number of underwater dynamic sealing points, and reduces the risk of leakage. At the same time, the raw water in the sedimentation inlet pipe 25 is used as the backwash pressure water source. The booster pump 223 and the on / off valve 224 precisely control the water pressure and on / off, eliminating the need for an additional independent high-pressure water supply unit, further reducing the equipment cost and operation and maintenance difficulty of the entire non-stop sludge removal system.

[0053] In one possible implementation, see Appendix Figure 1The central collector 2 has a sludge storage chamber 24 inside, and the sludge discharge port 222 at the outlet of the backwash channel 22 is connected to the sludge storage chamber 24. After storing a sufficient amount of sludge in the sludge storage chamber 24, it is discharged into the sludge tank 13 all at once. In this scheme, if the bottom of the sludge storage chamber 24 is not sealed, the sludge in it will directly enter the sludge tank 13. Relying on the sludge storage chamber 24 with a sealed bottom, the small flow of sludge discharged from a single backwash can be temporarily buffered, and after a sufficient amount of sludge has accumulated in the chamber, it can be discharged into the sludge tank 13 in a concentrated manner. This greatly reduces the frequency of high-frequency, low-flow sludge discharge operations, reduces the start-up and shutdown losses of the matching sludge discharge valve, and facilitates the cleaning and maintenance of the sludge tank 13.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. The structure of the reaction tank in the water purification plant, including: A pool body (1) having circumferential sidewalls and a conical bottom, and a centrally located collector (2) rotatably disposed at the center of the bottom of the pool body (1), characterized in that it further includes a bottom wall collector (3), the bottom wall collector (3) comprising a collection pipe (31) and a pusher (32); the centrally located collector (2) has a cross-connected sludge collection channel (21) and a backwashing channel (22) inside, and a valve core (23) is rotatably disposed at the intersection of the two, the valve core (23) having a through channel (232) with a collection filter (231), the on / off states of the sludge collection channel (21) and the backwashing channel (22) being opposite and determined by the rotation of the valve core (23). Dynamic angle switching; one end of the collection pipe (31) is fixed to the central collector (2), and the other end extends along the generatrix direction of the conical bottom of the pool body (1) to the side wall of the pool body (1). The collection pipe (31) has an open arc cross section, and the opening direction is towards the circumference of the pool body (1). The pusher (32) is slidably disposed in the collection pipe (31) and the sliding position can be controlled. The inlet end of the sludge collection channel (21) is connected to the collection pipe (31), and the outlet end is provided with a drain outlet (211). The drain outlet (211) is provided with an opening and closing mechanism. The inlet end of the backwash channel (22) is connected to the pressure water source (221), and the outlet end is provided with a sludge discharge port (222). The collecting pipe (31) has a semi-circular cross section. The lower edge of the collecting pipe (31) slides in contact with the conical inclined surface (12) at the bottom of the pool body (1). A collecting filter (311) is provided on the rear side of the collecting pipe (31). The pusher (32) is slidably disposed on the inner arc side of the collecting tube (31). The pusher (32) is provided with a drive frame (321) that wraps around the back arc side of the collecting tube (31). The beginning and end of the collecting tube (31) are respectively provided with a first support (312) and a second support (313). A drive mechanism (314) is provided between the first support (312) and the second support (313). The drive mechanism (314) is connected to the drive frame (321) and controls its sliding position. The cross-connection area of ​​the sludge collection channel (21) and the backwash channel (22) is a spherical or disc-shaped cavity. The shape of the valve core (23) matches the cross-connection area and rotates to engage. Initially, the axis of the through channel (232) of the valve core (23) is aligned with the axis of the sludge collection channel (21) and connects to the sludge collection channel (21). After the valve core (23) rotates a certain angle, the axis of the through channel (232) of the valve core (23) is aligned with the axis of the backwash channel (22) and connects to the backwash channel (22). The valve core (23) is provided with an extended control shaft (233), which is connected to a power source.

2. The structure of the reaction tank in the water purification plant as described in claim 1, characterized in that: The opening and closing mechanism includes a first conical surface (212), a second conical surface (2131), and an elastic element (214). The first conical surface (212) is located on the inner side of the outlet of the sludge collection channel (21). The second conical surface (2131) is located on a piston body (213) that can slide within the outlet of the sludge collection channel (21). The elastic element (214) abuts against the side of the piston body (213) opposite to the first conical surface (212). Initially, the elastic element (214) allows the first conical surface (212) and the second conical surface (2131) to contact and close the outlet of the sludge collection channel (21). When there is pressure from the inlet to the outlet of the sludge collection channel (21), the first conical surface (212) and the second conical surface (2131) separate and connect the inlet and outlet of the sludge collection channel (21).

3. The structure of the reaction tank in the water purification plant as described in claim 2, characterized in that: On the valve core (23), the collecting filter (231) is located at one end of the through channel (232), and the through channel (232) and the collecting filter (231) form a barrel-shaped structure.

4. The structure of the reaction tank in the water purification plant as described in claim 3, characterized in that: The central collector (2) is provided with a sedimentation inlet pipe (25) at its center. The lower end of the sedimentation inlet pipe (25) is the inlet end, and the upper end of the sedimentation inlet pipe (25) is the outlet end. The side wall of the outlet end is provided with radial water distribution holes (251). The top of the circumferential side wall of the pool body (1) is provided with an outlet area (11).

5. The structure of the reaction tank in the water purification plant as described in claim 4, characterized in that: The outlet (211) of the sludge collection channel (21) is connected to the sedimentation inlet pipe (25), and the inlet of the backwash channel (22) is connected to the sedimentation inlet pipe (25). A booster pump (223) and an on / off valve (224) are provided between the two.

6. The structure of the reaction tank in the water purification plant as described in claim 5, characterized in that: The central collector (2) is provided with a sludge storage chamber (24) inside, and the sludge discharge port (222) at the outlet of the backwash channel (22) is connected to the sludge storage chamber (24).

7. The sludge removal process of the reaction tank in a water purification plant, characterized in that, The water purification plant reaction tank structure as described in claim 6 includes the following steps: Collection steps: Inside the collection tube (31), the pusher (32) is located at one end away from the central collector (2). The central collector (2) drives the collection tube (31) to rotate against the bottom conical surface of the pool body (1) and scrapes the settled sludge into the collection tube (31). At the intersection of the sludge collection channel (21) and the backwash channel (22), the valve core (23) cuts off the sludge collection channel (21). Collection steps: The pusher (32) moves along the collection pipe (31) and pushes the sludge in the collection pipe (31) into the inlet of the sludge collection channel (21). Then, at the intersection of the sludge collection channel (21) and the backwash channel (22), the valve core (23) connects to the sludge collection channel (21). The pusher (32) continues to move and squeeze the inlet of the sludge collection channel (21). The mud-water mixture passes through the collection filter (231) of the valve core (23). The sludge is trapped in the valve core (23). The water passes through the collection filter (231) and squeezes open the opening and closing mechanism to discharge. Cleaning steps: At the intersection of the sludge collection channel (21) and the backwash channel (22), the valve core (23) cuts off the sludge collection channel (21) and opens the backwash channel (22). High-pressure water flows in the opposite direction through the valve core (23) and its collection filter (231), and discharges the sludge trapped on the collection filter (231).

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