Secondary treatment direct drinking water equipment

Abstract

The invention discloses secondary treatment direct drinking water equipment, and relates to the technical field of water treatment, the secondary treatment direct drinking water equipment comprises a drinking water output structure, one side of the access end of the drinking water output structure is connected with a carbon filter structure, and the other side, located on the drinking water output structure, of the carbon filter structure is connected with a sand filter structure; the sand filter structure is connected with a water supply storage structure on the other side of the carbon filter structure; the sand filter structure comprises a main shell arranged on one side of the carbon filter structure, a pump body is arranged at the top of the main shell, an air supply disc is hermetically arranged at the bottom of the main shell, a filter element is arranged in the center in the main shell, a direction limiting disc is hermetically arranged at the top of the filter element, a sealing seat is arranged in the filter element, and a stirring rod is arranged in the middle of the sealing seat; the stirring rod penetrates through the bottom of the sealing seat and is connected with an adjusting seat. Layered cleaning is carried out on the interior in a stirring and air spraying mode, impurities attached to an internal filter material effectively fall off, the layers of the filter material are prevented from being damaged, and meanwhile it is avoided that internal fine sand is taken out when the impurities are discharged.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a secondary treatment device for direct drinking water. Background Technology

[0002] In secondary treatment drinking water equipment, sand filters and carbon filters are mainly used to perform secondary filtration of the water flow, thereby forming a water source that can be directly consumed by people. Among them, sand filters mainly remove impurities in the water through physical interception and adsorption. When water flows through the quartz sand layer, larger suspended particles are intercepted by the surface coarse sand, while fine particles are adsorbed by the lower fine sand, forming a three-dimensional filtration structure of "coarse on top and fine on the bottom".

[0003] However, as the equipment is used for a longer period of time, the debris trapped inside the sand filter accumulates and can easily fill the gaps between particles, causing blockage. To address this issue, backwashing is usually used, where water flows from bottom to top to impact the filter media layer, thereby expelling impurities with the water flow. However, the filter media may become compacted due to impurity trapping, microbial growth, or chemical precipitation, forming a dense layer. During backwashing, the water flow has difficulty penetrating the compacted area, resulting in impurity residue. Moreover, the bottom-to-top backwashing path requires a certain water flow intensity. If the intensity is too high, fine sand may be discharged with the water flow, damaging the layered structure of the filter media, leading to increased porosity and reduced filtration resistance. Summary of the Invention

[0004] In order to improve the problem that the backwashing equipment in the current two-stage drinking water treatment equipment has poor cleaning performance of sand filters and easily carries out fine sand inside and damages the filter media layer structure, thereby reducing the filtration resistance, the present invention provides a two-stage drinking water treatment equipment.

[0005] The present invention provides a two-stage treatment direct drinking water equipment with the following technical solution:

[0006] A two-stage drinking water treatment device includes a drinking water output structure. One side of the inlet of the drinking water output structure is connected to a carbon filter structure for filtering organic matter and odors in the water flow. The carbon filter structure is connected to a sand filter structure for filtering suspended solids and colloids in the water flow on the other side of the drinking water output structure. The sand filter structure is connected to a water supply storage structure for temporarily storing the water flow on the other side of the carbon filter structure.

[0007] The sand filter structure includes a main housing disposed on one side of the carbon filter structure. A pump body is disposed on the top of the main housing, and an air supply plate is sealed at the bottom of the main housing. A filter element for sand filtration of water flow is disposed in the center inside the main housing. A directional limiting plate for changing the direction of water flow input to the pump body is sealed at the top of the filter element. A sealing seat for sealing the sand filter holes is disposed inside the filter element. A stirring rod for stirring the sand filter material is disposed in the middle of the sealing seat. The stirring rod passes through the bottom of the sealing seat and is connected to an adjustment seat for adjusting the cleaning and filtration modes.

[0008] By adopting the above technical solution, the directional limiting disc changes the direction of the water flow into the pump body, thereby driving the stirring rod to rotate. As the stirring rod rotates, it stirs the coarse particle layer at the top of the filter media, and the transmission adjustment seat squeezes the air supply disc to output gas that impacts the fine particle layer at the bottom of the filter media. This overall process forms a layered cleaning of the filter media, ensuring the cleaning effect while avoiding disrupting the layered structure of the filter media. Furthermore, the gas, moving from bottom to top, combined with the buoyancy of the water flow, floats the debris to the top of the filter media, where it is carried away by the water flow and discharged to the outside, avoiding problems with filter media discharge caused by excessive water flow intensity.

[0009] Preferably, the top of the air supply plate is provided with a main sealing groove for sealing connection with the main housing, and a plurality of air supply holes are provided around the side surface of the air supply plate. The plurality of air supply holes penetrate the interior of the air supply plate to form an installation cavity. An extension airbag for supplying gas to the interior of the filter element is fixed in the installation cavity. The extension airbag is located at the position of the plurality of air supply holes and is connected to the connection hole. The top of the extension airbag is provided with a first one-way air outlet for restricting the direction of air outlet.

[0010] By adopting the above technical solution, the stretching airbag absorbs external air through multiple air supply holes and fills the interior. When the stretching airbag is squeezed, the gas is output upward from the first one-way air outlet, thereby vibrating the fine particle layer of the filter material to form a debris cleaning effect.

[0011] Preferably, a cleaning water hole is provided on one side of the top of the directional limiting plate, and a filter water hole is provided on one side of the cleaning water hole. A rotating groove for limiting the stirring rod is provided at the bottom of the directional limiting plate between the cleaning water hole and the filter water hole.

[0012] By adopting the above technical solution, the cleaning water holes and the filtering water holes are oriented opposite each other, thereby receiving the input water flow of the pump body and changing the output direction of the water flow, forming two different processes of cleaning and filtering. At the same time, the opening of the rotating groove provides an installation support point for the top limit of the stirring rod, maintaining rotation while longitudinally fixing the stirring rod as a whole.

[0013] Preferably, the outer surface of the filter element has multiple rows of filter holes, the inner bottom surface of the filter element has a limiting groove, and the bottom center of the limiting groove has an external threaded hole extending downwards.

[0014] By adopting the above technical solution, the filter hole performs secondary filtration of the filtrate in the filter element, while the opening of the external thread hole provides a path for the gas discharged from the extension airbag, and at the same time, it cooperates with the thread setting at the bottom of the stirring rod to perform auxiliary thread connection.

[0015] Preferably, the surface of the adjusting seat is provided with a sealing groove that is sealed and connected to the sealing seat, and the middle of the adjusting seat is provided with a gas through hole that communicates with the first one-way gas outlet.

[0016] By adopting the above technical solution, the opening of the sealed groove provides installation space for the sealing connection of the sealing seat, while the opening of the gas through hole provides a movement path for the gas output from the first one-way gas outlet.

[0017] Preferably, the top surface of the adjusting seat is provided with a plurality of extension grooves surrounding the gas passage hole, and an extension plate is rotatably arranged in each of the plurality of extension grooves. A reverse extrusion surface is provided on one side of the top of each of the plurality of extension plates, and a limiting protrusion is provided on one side of the top of each of the plurality of extension grooves.

[0018] By adopting the above technical solution, the front end and the reverse extrusion surface of the extension plate are respectively engaged with the bottom of the stirring rod, thereby receiving the clockwise and counterclockwise rotation directions transmitted by the stirring rod.

[0019] Preferably, the bottom surface of the adjusting seat is provided with a friction surface that abuts against the inner wall of the limiting groove, and the bottom surface of the adjusting seat located on the friction surface is provided with a limiting block that engages with the limiting groove.

[0020] By adopting the above technical solution, the friction surface reduces the rotational flexibility of the adjusting seat and the limiting groove, thereby improving the damping performance. At the same time, the limiting block is located in the limiting groove and is engaged, thereby restricting the adjusting seat to only rotate back and forth within a certain range.

[0021] Preferably, the top of the outer surface of the stirring rod is surrounded by force-bearing blades, and the bottom of the force-bearing blades is surrounded by an array of stirring blades. The bottom of the stirring rod passes through the closed seat and is provided with a transmission disk on the surface of the adjusting seat. The bottom of the transmission disk is fixed with a plurality of L-shaped protrusions that engage with the extension plate.

[0022] By adopting the above technical solution, multiple stirring blades stir the filter media of the coarse particle layer to prevent debris from caking and reduce the wear on the particles. As the stirring rod rotates, the L-shaped protrusion engages with the extension plate, thereby transmitting the rotation to the adjusting seat to form synchronous rotation.

[0023] Preferably, the bottom of the transmission disk has an upward-facing air chamber, and the air chamber has multiple second one-way air outlets fixedly disposed on the outer surface of the stirring rod. A rotating rod is provided with a downward-protruding center at the top of the air chamber. The bottom of the rotating rod passes through the sealing seat and the gas passage in sequence and is located in the external threaded hole. A pressing block is threadedly connected to the part of the rotating rod located in the external threaded hole. The pressing block is threadedly connected to the external threaded hole. A limiting protrusion is provided at the bottom of the rotating rod to limit the excessive rotation of the pressing block.

[0024] By adopting the above technical solution, gas is transported from the air chamber to the second one-way air outlet, thereby cleaning the filter material of the fine particle layer. At the same time, the rotating rod rotates and drives the extrusion block to move up and down, thereby providing power for the extrusion and expansion airbag. Finally, the limiting protrusion limits the downward rotation of the extrusion block.

[0025] Preferably, both the carbon filter structure and the top of the main housing are equipped with pumps for pumping water flow, and a debris output pipe is provided on one side of the outer surface of the main housing. The upper and lower ends of the debris output pipe are movably inserted through the sidewall and located inside the filter element and the main housing.

[0026] By adopting the above technical solution, the impurity output pipeline is connected to the inside of the filter element and the main housing respectively, thereby removing the impurities in the filter element to the outside and discharging the first batch of filtered water after cleaning in the main housing to the outside to avoid cleaning residue, thereby improving the quality of filtered water use.

[0027] In summary, the present invention has at least one of the following beneficial technical effects:

[0028] 1. The force-bearing fan blades receive the impact of the water flow, thereby driving the stirring rod to rotate. This in turn causes the stirring fan blades to rotate laterally in the coarse particle layer of the filter media, while the extrusion block extrudes and the airbags spray air to vibrate the fine particle layer of the filter media. This creates a layered cleaning effect, effectively cleaning the particles while avoiding disrupting the layered structure of the filter media and maintaining its filtration resistance.

[0029] 2. The stirring rod vibrates the filter media to loosen the debris. Combined with the water flow from top to bottom, the debris is buoyed by the water flow and floats to the top of the filter media layer. Finally, it is carried by the water flow and discharged to the outside through the debris discharge pipe on one side. The debris discharge movement is small, thus avoiding the problem of the filter media being carried out due to excessive water flow intensity. Attached Figure Description

[0030] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0031] Figure 2 This is a three-dimensional schematic diagram of the sand filter structure of the present invention;

[0032] Figure 3This is a schematic cross-sectional view of the interior of the main housing of the present invention;

[0033] Figure 4 This is a side sectional view of the air supply plate of the present invention;

[0034] Figure 5 This is an exploded view of the sealing seat and stirring rod of the present invention;

[0035] Figure 6 This is a schematic diagram of the shape of the limiting groove of the present invention;

[0036] Figure 7 This is a schematic diagram of the internal structure of the adjusting seat of the present invention;

[0037] Figure 8 This is a schematic diagram of the internal structure of the stirring rod of the present invention;

[0038] Figure 9 This is a schematic cross-sectional view of the overall connection of the present invention.

[0039] Reference numerals: 1. Drinking water output structure; 2. Water supply storage structure; 3. Carbon filter structure;

[0040] 4. Sand filter structure; 41. Main shell;

[0041] 42. Air supply plate; 421. Main sealing groove; 422. Air supply hole; 423. Mounting cavity; 424. Extension airbag; 425. First one-way air outlet; 426. Connecting hole;

[0042] 43. Filter element; 431. Filter hole; 432. Limiting groove; 433. External threaded hole;

[0043] 44. Directional limit plate; 441. Cleaning water hole; 442. Filter water hole; 443. Rotating groove;

[0044] 45. Enclosed seat;

[0045] 46. ​​Stirring rod; 461. Force-bearing fan blade; 462. Stirring fan blade; 463. Transmission disc; 464. Second one-way air outlet; 465. Air chamber; 466. Rotating rod; 467. L-shaped protrusion; 468. Limiting protrusion; 469. Extrusion block;

[0046] 47. Adjusting seat; 471. Sealing groove; 472. Gas passage; 473. Extension groove; 474. Extension plate; 475. Limiting protrusion; 476. Friction surface; 477. Limiting rotating block; 478. Reverse extrusion surface;

[0047] 48. Debris discharge pipeline;

[0048] 5. Pump body. Detailed Implementation

[0049] The following is in conjunction with the appendix Figures 1-9 The present invention will be described in further detail below.

[0050] This invention discloses a two-stage treatment direct drinking water device.

[0051] Reference Figure 1 , Figure 2 , Figure 3 A two-stage drinking water treatment device includes a drinking water output structure 1 for outputting filtered drinking water. A carbon filter structure 3 is connected to one side of the inlet of the drinking water output structure 1 via a pipeline. A sand filter structure 4 is connected to one side of the inlet of the carbon filter structure 3 via a pipeline. A water supply storage structure 2 is connected to one side of the inlet of the sand filter structure 4 via a pipeline. The water supply storage structure 2 is connected to an external water supply system via a pipeline, thereby forming a water flow filtration path. A pump body 5 is fixed on the top of the housings of both the carbon filter structure 3 and the sand filter structure 4 to provide power for pumping water. The pump body 5 connected to the sand filter structure 4 is a dual-output motorized pump with two output ports for distributed output.

[0052] It should be noted that the drinking water output structure 1 has a PLC logic control system inside its casing, which is connected to the circuits of the two pump bodies 5 via wires, thereby regulating the reception and output of the carbon filter structure 3 and the sand filter structure 4. At the same time, the drinking water output structure 1 is connected to a water quality detection device and a water quantity detection device at the drinking water output end. When the water quality detection device identifies that the drinking water quality does not meet the standard, it sets the output state of the pump body 5 through the control system to perform a cleaning process on the internal carbon filter structure 3. When the water quantity detection device identifies that the output water quantity is insufficient, it sets the output state of the pump body 5 through the control system to perform a cleaning process on the internal sand filter structure 4.

[0053] Reference Figure 3 , Figure 4 , Figure 9The sand filter structure 4 includes a main housing 41 disposed on one side of the housing of the carbon filter structure 3. An air supply plate 42 is threaded onto the bottom of the main housing 41. The upper end of the air supply plate 42 has a main sealing groove 421 threadedly connected to the main housing 41. Multiple air supply holes 422 are formed through the outer surface of the air supply plate 42. Each air supply hole 422 is a one-way hole, allowing gas to enter but not exit. Each air supply hole 422 has a mounting cavity 423 formed through the center of the air supply plate 42. An extension air... The side surfaces of the airbag 424 are glued and fixed to the inner wall of the mounting cavity 423. The four sides of the airbag 424 are provided with connecting holes 426 through the interior, and the multiple connecting holes 426 are connected to the multiple air supply holes 422 one by one (a high pressure resistant sealing ring is fitted at the connection between the connecting hole 426 and the air supply hole 422 to reduce the vibration generated when the gas enters, and the contact surfaces of the high pressure resistant sealing ring and the connecting hole 426 and the air supply hole 422 are glued to provide fixation and maintain sealing).

[0054] The expansion airbag 424 is equipped with a spring, which is in an extended state. This allows the expansion airbag 424 to fill the inner wall of the mounting cavity 423 and draw external air into the expansion airbag 424 through the connecting hole 426. At the same time, the top of the inner wall of the mounting cavity 423 is connected to the outside through the air supply plate 42. The expansion airbag 424 is provided with a first one-way air outlet 425 at the through opening of the mounting cavity 423. The first one-way air outlet 425 ensures that the gas in the expansion airbag 424 is always in an outward output state, and limits the maximum expansion width of the first one-way air outlet 425 so that the one-time air pressure of the expansion airbag 424 is 0.2 to 0.5 bar. This maintains the vibration of the filter material of the fine particle layer while preventing excessive air pressure from carrying away the filter material.

[0055] Reference Figure 3 , Figure 5 , Figure 6 A filter element 43 is inserted into the bottom of the cavity of the main housing 41, and a directional limiting plate 44 is threadedly connected to the top of the filter element 43. The directional limiting plate 44 is made of high-density polyethylene material, which has good high pressure resistance and corrosion resistance, and is used to withstand the conveying pressure of the pump body 5 for a long time. The upper end face of the directional limiting plate 44 is in contact with the top of the inner wall of the main housing 41.

[0056] Furthermore, the two output ends of the dual-output motorized pump body 5 pass through the main housing 41 and are sealed to the directional limiting plate 44. The directional limiting plate 44 has a cleaning water hole 441 and a filtering water hole 442 respectively at the two output ends of the dual-output motorized pump body 5. The channels of the cleaning water hole 441 and the filtering water hole 442 are both inclined, so that the input water flow is synchronously inclined and impacts the inside of the filter element 43. The outlet ends of the cleaning water hole 441 and the filtering water hole 442 are opposite to each other, so that the water flow input from the two output ends of the dual-output motorized pump body 5 flows into the filter element 43 in opposite directions. The top of the inner surface of the directional limiting plate 44 is provided with a rotating groove 443 between the cleaning water hole 441 and the filtering water hole 442.

[0057] A stirring rod 46 is rotatably installed inside the rotating groove 443. An arc-shaped force-bearing fan blade 461 is fixed around the surface of the stirring rod 46 at the bottom of the cleaning water hole 441 and the filter water hole 442. The arc-shaped curved surface of the force-bearing fan blade 461 faces the outlet of the cleaning water hole 441, so that the water flow output from the filter water hole 442 exerts a smaller thrust on the force-bearing fan blade 461, while the water flow output from the cleaning water hole 441 exerts a larger thrust on the force-bearing fan blade 461. Multiple rows of stirring fan blades 462 are fixed downward around the bottom of the force-bearing fan blade 461 on the surface of the stirring rod 46 (the row of stirring fan blades 462 is made of alumina ceramic material and is set to a thickness of 1-2mm to reduce wear on the quartz sand). The surface of each row of stirring fan blades 462 is inclined at 5°, thus forming a stepped state, so that the quartz sand is stirred without causing large-scale disorder of quartz sand layers.

[0058] It should be noted that the filter element 43 is filled with quartz sand in a stepped layer to filter impurities from the water flow. Three rows of filter holes 431 are arranged around the outer surface of the filter element 43, and each row of filter holes 431 is distributed at a 60° interval. This filters the water flow in the filter element 43 and leads it into the main housing 41. At the same time, the agitator blades 462 are one-third of the distance from the bottom of the filter element 43 cavity, so that the agitator blades 462 are in the coarse quartz sand layer and the fine quartz sand layer is in the bottom of the filter element 43 cavity, further avoiding the phenomenon of disordered quartz sand particles.

[0059] Reference Figures 5 to 8A sealing seat 45 is provided at the bottom of the cavity of the main housing 41. Three support plates extend upward from the upper end of the sealing seat 45, and the width of each support plate is sufficient to cover each row of filter holes 431. The filtering and cleaning state of the filter element 43 is controlled by rotating the sealing seat 45. The outer surface diameter of the sealing seat 45 is the same as the inner diameter of the cavity of the main housing 41, so that the sealing seat 45 and the inner wall of the cavity of the main housing 41 are always in a tight contact state. An adjusting seat 47 is threadedly connected to the lower end face of the sealing seat 45. A sealing groove 471 for threaded connection with the sealing seat 45 is provided on the upper end face of the adjusting seat 47. A groove is provided downward in the middle of the sealing groove 471 of the adjusting seat 47, and a gas passage hole 472 is provided downward through the center of the groove. A friction surface 476 is provided protruding from the bottom of the outer surface of the adjusting seat 47 at the gas passage hole 472. A limiting rotating block 477 is fixed on the bottom surface of the friction surface 476.

[0060] Meanwhile, a limiting groove 432 is formed downwards at the bottom of the filter element 43 cavity, located at the position of the limiting rotating block 477. An external threaded hole 433 is formed further downwards in the middle of the limiting groove 432 (the external threaded hole 433 communicates with the through hole at the top of the air supply plate 42). The limiting groove 432 is circular in shape, and a notch is provided on one side of the circle (e.g., Figure 6 As shown), the shape of the limiting rotating block 477 is consistent with the circular notch of the limiting rotating groove 432, so that when the limiting rotating block 477 rotates in the limiting rotating groove 432, it can only rotate back and forth by 60°, thus forming a limit. At the inner wall of the through channel of the limiting rotating groove 432, the friction surface 476 rubs and squeezes against the inner wall surface, reducing the rotation speed of the limiting rotating block 477 while maintaining the sealing. When the limiting rotating block 477 rotates and drives the adjusting seat 47 to rotate as a whole, the sealing seat 45 rotates synchronously, thus completing the transmission effect.

[0061] Reference Figures 7 to 9 The bottom of the stirring rod 46 is movably connected through the closed seat 45 and a transmission disc 463 is fixed on the surface of the adjusting seat 47. The diameter of the transmission disc 463 is consistent with the groove of the adjusting seat 47, so that the outer surface of the transmission disc 463 is always in contact with the inner wall of the groove of the adjusting seat 47 and can rotate. Three L-shaped protrusions 467 are fixed around the gas passage hole 472 on the lower end face of the transmission disc 463. At the same time, the groove surface of the adjusting seat 47 is provided with extension grooves 473 at the positions of the three L-shaped protrusions 467. An extension plate 474 is rotatably installed in each extension groove 473, and a spring is fixed at the bottom of each extension plate 474 (the spring is in an outward extension state).

[0062] When the extension plate 474 is ejected from the extension groove 473 by the spring, rotating the stirring rod 46 counterclockwise can cause the L-shaped bent portion of the L-shaped protrusion 467 to engage with the groove at the front end of the extension plate 474 (e.g., Figure 7 , Figure 8 (Shape display), each extension plate 474 has a protruding reverse extrusion surface 478 on its top. Rotating the stirring rod 46 clockwise can cause the L-shaped protrusion 467 to bend its back arc surface and press against the reverse extrusion surface 478. A limit protrusion 475 is provided laterally on one side of the extension groove 473 located on the extension plate 474 to prevent the extension plate 474 from being over-rotated.

[0063] An air chamber 465 is formed through the center of the bottom of the transmission disc 463 and extends upwards. A second one-way air outlet 464 is formed through the surface of the stirring rod 46 at the top of the air chamber 465, so that the gas discharged upwards from the air chamber 465 is always in the output state, thereby preventing water from the filter element 43 from entering the air chamber 465. The opening of the second one-way air outlet 464 is located above the bottom surface of the closed seat 45, thereby ensuring that the gas output from the air chamber 465 drives the quartz sand to vibrate. A rotating rod 466 is provided protruding downwards from the top of the inner wall of the air chamber 465.

[0064] The bottom of the rotating rod 466 extends downward from the gas through hole 472 into the external threaded hole 433. A thread in the opposite direction is also provided on the surface of the rotating rod 466 within the area of ​​the external threaded hole 433. Both the thread of the rotating rod 466 and the external threaded hole 433 are reciprocating threads. A pressing block 469 is threadedly connected between the rotating rod 466 and the external threaded hole 433. When the rotating rod 466 rotates, the pressing block 469 moves downward due to the drive of the thread of the rotating rod 466 and the external threaded hole 433. Pressure is applied to the expansion airbag 424 through the through hole of the air supply plate 42, thereby squeezing out the gas inside the expansion airbag 424. A limiting protrusion 468 is laterally protruding and fixed at the bottom end of the rotating rod 466. The top surface of the limiting protrusion 468 limits the downward movement of the pressing block 469 to prevent excessive rotation.

[0065] It should be noted that all threads used in this equipment are NPT threads with a 60° thread angle and a 1:16 taper, which ensures a sealed connection. A debris output pipe 48 is provided on the outer surface of the main housing 41. The top end of the debris output pipe 48 penetrates the main housing 41 and is located inside the filter element 43 to discharge floating debris to the outside. The bottom end of the debris output pipe 48 penetrates the main housing 41 and connects to the inside of the main housing 41 to discharge the water filtered during the first cleaning, thereby preventing wastewater residue from the cleaning process.

[0066] The implementation principle of a two-stage treatment direct drinking water device according to an embodiment of the present invention is as follows: When using this device, the pump body 5 draws the water in the water supply storage structure 2 into the filter element 43 through the filter water hole 442. During the water flow process, the water flows through the inclined channel of the filter water hole 442 and comes into contact with the back of the force-bearing fan blade 461, thereby generating an impact force that drives the stirring rod 46 to rotate counterclockwise.

[0067] As the stirring rod 46 rotates counterclockwise, the bent ends of multiple L-shaped protrusions 467 engage with the recesses of multiple extension plates 474, thereby transmitting the impact force on the stirring rod 46 from the adjusting seat 47 to the closing seat 45. The closing seat 45 rotates, causing the three support plates at the top to rotate, thus exposing the three rows of filter holes 431 that were previously covered. When the adjusting seat 47 rotates to 60°, the outer surface of the limiting rotating block 477 abuts against the notch of the limiting rotating groove 432, thus stopping the rotation and fixing the stirring rod 46 as a whole. At this time, as water flows in, the impurities in the water are intercepted by the quartz sand inside the filter element 43, thus forming a filtration effect. The filtered water flows out through the filter holes 431 into the main housing 41, which facilitates the completion of the subsequent carbon filter structure 3 (the 60° rotation range only allows the extrusion block 469 to move only a small range along the bottom of the rotating rod 466, avoiding misalignment).

[0068] As the equipment is used for a longer period of time, impurities trapped between the quartz sand particles accumulate, causing blockage in the gaps and resulting in insufficient output of filtered water. The water volume detection device sends a signal, and the control system adjusts the output end of the dual-output motorized pump body 5 to allow water to flow into the filter element 43 through the cleaning water hole 441. The water flow is impacted by the inclined hollow channel of the cleaning water hole 441, which generates an impact force on the force-bearing fan blade 461, causing the stirring rod 46 to rotate clockwise. As the stirring rod 46 rotates, it drives multiple stirring fan blades 462 to rotate within the coarse quartz sand particle layer, generating a stirring action. This loosens the dense layer of coarse particles that have accumulated, settled, and hardened (the stirring fan blades 462 are thin and have an inclined surface design, thereby reducing wear from the particles).

[0069] Simultaneously, the clockwise rotation of the stirring rod 46 causes the bent ends of multiple L-shaped protrusions 467 to move away from the recess of the currently engaged extension plate 474, thereby canceling the engagement state. The extension plate 474 is stretched by the bottom spring, thus forming the top reverse extrusion surface 478, which is always located on the surface of the adjusting seat 47. As the stirring rod 46 rotates clockwise, the arc-shaped back of multiple L-shaped protrusions 467 presses against the reverse extrusion surface 478 of the next extension plate 474, thereby pushing the adjusting seat 47 to make the closing seat 45 rotate, thereby blocking the three rows of filter holes 431 again. When the three rows of filter holes 431 are blocked, the overall rotation angle is 60°. The limiting rotating block 477 abuts against the other side of the limiting rotating groove 432, thereby stopping the rotation. The closing seat 45 stops synchronously. At this time, as the water continues to flow in, the L-shaped protrusions 467 rotate and press the extension plate 474 into the extension groove 473, thereby avoiding blocking the rotation of the L-shaped protrusions 467 and the stirring rod 46 itself.

[0070] During the continuous clockwise rotation of the stirring rod 46, the extrusion block 469 is driven to move up and down along the reciprocating thread surface of the rotating rod 466 and the external threaded hole 433, thereby extruding the expansion airbag 424. The expansion airbag 424 is extruded through the first one-way air outlet 425 into the air chamber 465, and finally discharged from the bottom of the filter element 43 cavity upward through the second one-way air outlet 464. This generates a gas impact that vibrates the filter material of the fine sand particle layer, vibrating out the impurities inside (the fine sand filter material is delicate and only needs to be subjected to a small amount of gas impact, combined with the filling of water flow, to generate vibration).

[0071] As water is poured in, internal debris floats from bottom to top, reaching the top of the filter media layer. As the water flows in, it fills the filter element 43, allowing subsequent water to flow out through the debris outlet pipe 48 on one side. During the outflow of water, floating debris is carried out and discharged simultaneously. In this process, the water flow at the horizontal position of the debris outlet pipe 48 is in a turbulent state, while the filter media in the coarse and fine particle layers are not affected by the turbulence. This prevents the excessive water flow from carrying the filter media to the outside and effectively cleans the filter media. At the same time, through the stratification treatment of stirring and aeration, only 20 to 30 minutes of natural sedimentation of the filter media is needed to restore the stratified structure.

[0072] After the filter media cleaning process is completed, the pump body 5 resumes the water supply process to the filter water holes 442. At this time, the first batch of filtered water (which continues to be filtered for about an hour) can be discharged to the outside through the debris output pipe 48 on one side, thereby effectively avoiding the mixed water flow from the cleaning process from being transported to the water supply system.

[0073] The above are merely optional embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A two-stage treatment direct drinking water device, characterized in that: The system includes a drinking water output structure (1), on one side of the access end of the drinking water output structure (1) is a carbon filter structure (3) for filtering organic matter and odors in the water flow, on the other side of the drinking water output structure (1) is a sand filter structure (4) for filtering suspended solids and colloids in the water flow, and on the other side of the carbon filter structure (3) is a water supply storage structure (2) for temporarily storing the water flow. The sand filter structure (4) includes a main housing (41) disposed on one side of the carbon filter structure (3). A pump body (5) is disposed on the top of the main housing (41). An air supply plate (42) is sealed at the bottom of the main housing (41). A filter element (43) for sand filtration of water flow is disposed in the center inside the main housing (41). A direction limiting plate (44) for changing the direction of water flow input to the pump body (5) is sealed at the top of the filter element (43). A sealing seat (45) for sealing the sand filter holes is disposed inside the filter element (43). A stirring rod (46) for stirring the sand filter material is disposed in the middle of the sealing seat (45). The stirring rod (46) passes through the bottom of the sealing seat (45) and is connected to an adjustment seat (47) for adjusting the cleaning and filtration modes.

2. The secondary treatment direct drinking water equipment according to claim 1, characterized in that: The top of the air supply plate (42) is provided with a main sealing groove (421) for sealing connection with the main housing (41). The side surface of the air supply plate (42) is provided with a plurality of air supply holes (422). The plurality of air supply holes (422) penetrate the interior of the air supply plate (42) and are provided with an installation cavity (423). An extension airbag (424) for supplying gas to the interior of the filter element (43) is fixed in the installation cavity (423). The extension airbag (424) is provided with a connecting hole (426) at the position of the plurality of air supply holes (422). The top of the extension airbag (424) is provided with a first one-way air outlet (425) for restricting the direction of air outlet.

3. The secondary treatment direct drinking water equipment according to claim 2, characterized in that: The directional limiting plate (44) has a cleaning water hole (441) on one side of its top facing downwards, and a filter water hole (442) on one side of its cleaning water hole (441) facing downwards. The bottom of the directional limiting plate (44) has a rotating groove (443) for limiting the stirring rod (46) between the cleaning water hole (441) and the filter water hole (442).

4. The secondary treatment direct drinking water equipment according to claim 3, characterized in that: The filter element (43) has multiple rows of filter holes (431) around its outer surface, and a limiting groove (432) is provided on the bottom surface of the filter element (43). The limiting groove (432) has an external threaded hole (433) extending downward through the center of its bottom.

5. The secondary treatment direct drinking water equipment according to claim 4, characterized in that: The surface of the adjusting seat (47) is provided with a sealing groove (471) that is sealed and connected to the sealing seat (45), and the middle part of the adjusting seat (47) is provided with a gas through hole (472) that communicates with the first one-way gas outlet (425).

6. The secondary treatment direct drinking water equipment according to claim 5, characterized in that: The top surface of the adjusting seat (47) is provided with a plurality of extension grooves (473) surrounding the gas through hole (472). An extension plate (474) is rotatably arranged in each of the plurality of extension grooves (473). A reverse extrusion surface (478) is provided on one side of the top of each of the plurality of extension plates (474). A limiting protrusion plate (475) is provided on one side of the top of each of the plurality of extension grooves (473).

7. A secondary treatment direct drinking water device according to claim 6, characterized in that: The bottom surface of the adjusting seat (47) is surrounded by a friction surface (476) that abuts against the inner wall of the limiting groove (432). The bottom surface of the adjusting seat (47) on the friction surface (476) is provided with a limiting block (477) that is engaged with the limiting groove (432).

8. The secondary treatment direct drinking water equipment according to claim 7, characterized in that: The top of the outer surface of the stirring rod (46) is surrounded by a force-bearing fan blade (461), and a plurality of stirring blades (462) are arranged in an array around the bottom of the force-bearing fan blade (461). The bottom of the stirring rod (46) passes through the closed seat (45) and is located on the surface of the adjusting seat (47) with a transmission disc (463). The bottom of the transmission disc (463) is fixed with a plurality of L-shaped protrusions (467) that engage with the extension plate (474).

9. A secondary treatment direct drinking water device according to claim 8, characterized in that: The transmission disc (463) has an upward-facing air chamber (465) at its bottom. The air chamber (465) passes through the outer surface of the stirring rod (46) and is fixed with multiple second one-way air outlets (464). A rotating rod (466) is provided with a downward-protruding center at the top of the air chamber (465). The bottom of the rotating rod (466) passes through the sealing seat (45) and the gas through hole (472) in sequence and is located in the external threaded hole (433). A pressing block (469) is threadedly connected to the part of the rotating rod (466) located in the external threaded hole (433). The pressing block (469) is threadedly connected to the external threaded hole (433). A limiting protrusion (468) is provided at the bottom of the rotating rod (466) to limit the excessive rotation of the pressing block (469).

10. A secondary treatment direct drinking water device according to claim 1, characterized in that: The top of the carbon filter structure (3) and the main housing (41) are both equipped with a pump body (5) for pumping water flow. A debris output pipe (48) is provided on one side of the outer surface of the main housing (41). The upper and lower ends of the debris output pipe (48) are movably penetrating the side wall and located inside the filter element (43) and the main housing (41).

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