Underground water filtering device

Abstract

The invention discloses an underground water filtering device, and relates to the technical field of underground water filtering. The underground water filtering device comprises a tank body and two grating discs which are longitudinally distributed and fixedly connected to an inner cavity of the tank body, a rotating shaft penetrating through the tank body in the longitudinal direction is installed on a driving part, a cleaning part is jointly installed outside the rotating shaft and a collecting barrel, and a plurality of feeding grooves are formed in the outer wall, located on the upper section of the upper collecting barrel, of the collecting barrel in the circumferential direction at equal intervals; a linkage part is jointly arranged between the lower part of the rotating shaft and the lower part of the collecting barrel, so that large-particle suspended matters collected during the filtering operation are released, and meanwhile, water is prevented from leaking from the upper section of the collecting barrel. And in the backwashing stage, a two-section cleaning mode of deep turning and washing is carried out on the filter material layer, so that the optimal treatment effects are respectively exerted in the filtering process and the filter material regeneration process aiming at different types of impurities, and the treatment flux of underground water is improved while the filtering quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of groundwater filtration technology, specifically to a groundwater filtration device. Background Technology

[0002] Groundwater is a natural water resource stored in aquifers below the Earth's surface. During its formation, it carries sediment, suspended particles, colloids, and organic impurities. Direct use without treatment can easily cause waterway blockages and failure to meet hygiene standards. Therefore, groundwater needs to be purified before use at depths to ensure its quality meets the requirements for subsequent processes. Mechanical filtration is commonly used in the initial treatment stage to remove sediment, algae, and suspended impurities from groundwater through physical interception. Currently, the most commonly used method is the quartz sand filter, which generally consists of a tank, upper and lower layers of grids installed inside the tank, and filter media filled between the grids. The working principle is to use the filter layer formed by quartz sand to intercept suspended solids, sediment, algae, and other particulate impurities as water flows through the filter layer, achieving primary purification of groundwater. As the filtration process continues, the trapped impurities accumulate on the grids and in the filter media, reducing water flow. Therefore, it is necessary to clean the accumulated impurities regularly.

[0003] Currently, traditional quartz sand filters mostly use backwashing for cleaning, which involves controlling the water flow to flow in the opposite direction from bottom to top to flush away the filter layer and remove the trapped suspended solids. Although this method is simple and has a certain cleaning effect, it relies entirely on reverse water flow and can only be cleaned during backwashing. As a result, large suspended solids continue to accumulate during the filtration process and gradually form a thick "filter cake" on the screen, which limits the filtration time and reduces the water output and filtration efficiency. At the same time, for larger particles, it is often difficult to effectively flush them out by simply relying on water flow during subsequent backwashing.

[0004] On the other hand, groundwater contains colloidal or algal components, which easily adhere to the surface of quartz sand, causing the filter media to clump together. During subsequent backwashing, due to the dense accumulation of the filter layer, it is difficult to completely break it apart by traditional water flow impact, resulting in incomplete removal of impurities from the filter media surface, which in turn leads to mediocre groundwater filtration effect and slow backwash recovery speed. Summary of the Invention

[0005] This invention provides a groundwater filtration device that solves the problems of traditional groundwater filtration equipment that relies entirely on backwash water flow for cleaning and can only function under backwash conditions. As a result, a large number of large suspended particles will continuously accumulate during the filtration process, leading to increased filtration resistance and decreased filtration capacity. Moreover, these large particles are difficult to be effectively flushed out by the water flow during backwashing. At the same time, colloids and algae in groundwater tend to adhere to the surface of quartz sand, causing the filter media to stick and clump together. The backwash water flow is unable to fully agitate the filter layer, resulting in incomplete removal of impurities.

[0006] This invention provides a groundwater filtration device, comprising a tank and two longitudinally distributed grid discs fixedly connected to the inner cavity of the tank. A drive unit is installed on the upper part of the tank, and a rotating shaft extending longitudinally through the tank is mounted on the drive unit. A collection cylinder movably sleeved outside the rotating shaft is rotatably connected to the two grid discs and the bottom of the tank. A cleaning unit is installed on both the rotating shaft and the outside of the collection cylinder. Several feed troughs are equidistantly spaced on the outer wall of the upper section of the collection cylinder. A linkage unit is provided between the lower part of the rotating shaft and the lower part of the collection cylinder. A variable sealing unit is provided between the rotating shaft and the collection cylinder. The groundwater filtration device has two operating conditions: when the tank is performing filtration: the drive unit drives the rotating shaft to rotate, and simultaneously the cleaning unit rotates synchronously with the rotating shaft to clean the water trapped in the upper grid discs. Large suspended particles on the surface of the grid are scraped and gathered towards the center of the tank. They then enter the collection cylinder through the feed chute. At this time, the variable sealing unit is in the working position of sealing the lower section of the collection cylinder to prevent water from leaking out from the lower section. When the tank is backwashed: the drive unit first drives the rotating shaft to move upward along the axis, triggering the linkage unit to operate, so that the rotating shaft and the collection cylinder are locked synchronously. Then, the drive unit drives the rotating shaft to rotate synchronously with the collection cylinder, and drives the cleaning unit to backwash and agitate the filter media, stirring and releasing the colloids and fine impurities attached to the filter media. At this time, the variable sealing unit switches to the working position of sealing the upper section of the collection cylinder, so that the large suspended particles collected during the filtration operation can be released, while preventing water from leaking out from the upper section of the collection cylinder.

[0007] In one possible implementation, the drive unit includes two electrically operated telescopic rods that are symmetrically fixedly connected to the upper part of the tank. The upper ends of the two electrically operated telescopic rods are fixedly connected to a bracket, and a drive motor is fixedly connected to the bracket. The output end of the drive motor is fixedly connected to the upper end of the rotating shaft.

[0008] In one possible implementation, the cleaning unit includes an arc-shaped scraper, and a plurality of connecting plates are fixedly connected circumferentially at equal intervals above the upper grid plate on the outer wall of the rotating shaft. Each connecting plate has an arc-shaped scraper fixedly connected to its lower end face, which is attached to the surface of the upper grid plate.

[0009] In one possible implementation, the cleaning unit further includes a mounting ring fixedly connected to the outer wall of the collection cylinder and located between two grid discs. The outer wall of the mounting ring is circumferentially and equidistantly connected with a plurality of levers, and the outer wall of the mounting ring is circumferentially and equidistantly connected with a plurality of fixing frames. The fixing frames are equidistantly connected with a plurality of levers, and the levers on the fixing frames are arranged in two rows.

[0010] In one possible implementation, the linkage includes a ring seat fixedly connected to the lower part of the collecting cylinder. The lower end face of the ring seat has several mounting grooves equidistantly spaced around its circumference. Each mounting groove has a wedge-shaped tooth slidably connected to it. A top spring is fixedly connected between the wedge-shaped tooth and the mounting groove. A waist-shaped through groove is provided at the lower part of the rotating shaft. A locking post that cooperates with the wedge-shaped tooth is slidably connected in the waist-shaped through groove. The locking posts are distributed perpendicular to the axis of the rotating shaft. A limit spring is fixedly connected between the locking post and the waist-shaped through groove.

[0011] In one possible implementation, the variable sealing part includes two outer sealing rings fixedly connected to the inner wall of the collection cylinder along the axial direction of the collection cylinder, and two inner sealing rings rotatably connected to the outer wall of the rotating shaft and located inside the collection cylinder for cooperating with the outer sealing rings.

[0012] In one possible implementation, the upper end face of the outer plug ring gradually slopes towards the side closer to the axis of the collecting cylinder from top to bottom, while the upper end face of the inner plug ring slopes away from the axis of the collecting cylinder from top to bottom, and an elastic sealing ring is fixedly connected to the outer wall of the inner plug ring.

[0013] In one possible implementation, the bottom of the feed trough gradually slopes towards the side closer to the rotating shaft from top to bottom.

[0014] In one possible implementation, a support disc is fixedly connected to the upper end of the collecting cylinder and movably sleeved outside the rotating shaft.

[0015] As can be seen from the above technical solutions, the present invention has the following advantages: In the present invention, by using the arc-shaped scraper in the cleaning section to scrape the surface of the grid disc in real time during the filtration process, the large particles of suspended matter filtered out can be scraped off and collected in the early stage of sedimentation, so that the grid disc can always maintain a good water flow state throughout the entire filtration cycle, and the filtration efficiency can be maintained stably. At the same time, since the large particles of impurities are collected in advance and discharged uniformly in the backwash stage in conjunction with the variable sealing section, the problem that large particles are difficult to be carried away by the backwash water flow in the traditional structure is effectively avoided, and the filtration stability and the amount of water treated per unit time are greatly improved.

[0016] In this invention, the filter media layer is agitated in multiple directions during backwashing using a cleaning unit. Combined with the reverse water flow, the filter media expands and tumbles deeply, effectively peeling off and thoroughly removing colloids and other impurities adhering to the surface of the filter media. This restores the filter layer to a loose and permeable state, ensuring good pore structure and permeability in subsequent filtration processes. It significantly improves the regenerability of the filter media, allowing the filter layer to recover a high filtration capacity after each backwash, thereby increasing the water treatment capacity and filtration effect in subsequent filtration stages.

[0017] In this invention, a two-stage cleaning method is used to clean large suspended particles in real time during the filtration stage and to deeply wash the filter media layer during the backwashing stage. This allows the filtration process and the filter media regeneration process to achieve the best treatment effect for different types of impurities, ensuring filtration quality while increasing the treatment throughput of groundwater. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the groundwater filtration device provided by the present invention.

[0020] Figure 2 This is a schematic cross-sectional view of the tank structure provided by the present invention.

[0021] Figure 3 This is a schematic diagram of the cleaning unit installation structure provided by the present invention.

[0022] Figure 4 Provided by the present invention Figure 3 An enlarged schematic diagram of part A of the structure.

[0023] Figure 5 This is a cross-sectional schematic diagram of the variable sealing part installation structure provided by the present invention.

[0024] Figure 6 A schematic diagram of the linkage installation structure provided by the present invention.

[0025] The above-mentioned attached drawings include the following reference numerals: 1. Tank body; 2. Grille plate; 3. Drive unit; 31. Electric telescopic rod; 32. Drive motor; 4. Rotating shaft; 5. Collection cylinder; 6. Cleaning unit; 61. Arc-shaped scraper; 62. Mounting ring; 63. Paddle plate; 64. Paddle rod; 7. Feed chute; 8. Linkage unit; 81. Ring seat; 82. Wedge tooth; 83. Locking post; 9. Variable sealing unit; 91. Outer sealing ring; 92. Inner sealing ring. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5 This invention provides a technical solution: a groundwater filtration device, comprising a tank 1 and two longitudinally distributed grid discs 2 fixedly connected to the inner cavity of the tank 1. The space formed by the two grid discs 2 and the inner cavity is filled with quartz sand filter media. An inlet pipe is connected to the upper right side of the tank 1, an outlet pipe is connected to the lower left side of the tank 1, an input pipe is connected to the lower right side of the tank 1, and a discharge pipe is connected to the left side of the tank 1. Solenoid valves are respectively installed on the inlet pipe, outlet pipe, input pipe, and discharge pipe. A drive unit 3 is installed on the upper part of the tank 1, and a longitudinally penetrating device is installed on the drive unit 3. The rotating shaft 4 of the tank body 1, two grid discs 2 and the bottom of the tank body 1 are rotatably connected to a collection cylinder 5 that is movably sleeved outside the rotating shaft 4. A support disc that is movably sleeved outside the rotating shaft 4 is fixedly connected to the upper end of the collection cylinder 5 to support the middle part of the rotating shaft 4. A cleaning part 6 is installed on the outside of the rotating shaft 4 and the collection cylinder 5. Several feed grooves 7 are equidistantly opened on the outer wall of the upper section of the collection cylinder 5. The bottom of the feed grooves 7 gradually slopes from top to bottom towards the side closer to the rotating shaft 4 to facilitate the smooth entry of scraped impurities into the feed grooves 7. The lower part of the rotating shaft 4 A linkage unit 8 is provided between the lower part of the collection cylinder 5 and the rotating shaft 4. A variable sealing unit 9 is provided between the rotating shaft 4 and the collection cylinder 5. The groundwater filtration device has two operating conditions: When the tank 1 is performing filtration: the drive unit 3 drives the rotating shaft 4 to rotate, and the cleaning unit 6 rotates synchronously with the rotating shaft 4 to scrape the large suspended particles retained on the surface of the upper grid plate 2, causing them to gather along the surface of the grid plate 2 towards the middle of the tank 1, and then enter the collection cylinder 5 through the feed chute 7. At this time, the variable sealing unit 9 is in the working position of sealing the lower section of the collection cylinder 5 to prevent water from flowing out. When the lower section of the collection cylinder 5 leaks out, and the tank 1 is backwashing: the drive unit 3 first drives the rotating shaft 4 to move upward along the axis, triggering the linkage unit 8 to run, so that the rotating shaft 4 and the collection cylinder 5 are locked synchronously. Then the drive unit 3 drives the rotating shaft 4 and the collection cylinder 5 to rotate synchronously, and drives the cleaning unit 6 to backwash and agitate the filter media, stirring and releasing the colloids and fine impurities attached to the filter media. At this time, the variable sealing unit 9 is switched to the working position of sealing the upper section of the collection cylinder 5, so that the large particulate suspended matter collected during the filtration operation can be released, while preventing water from leaking out from the upper section of the collection cylinder 5.

[0028] Please see Figure 2 In this embodiment, the drive unit 3 includes two electric telescopic rods 31 that are symmetrically fixedly connected to the upper part of the tank body 1. The upper ends of the two electric telescopic rods 31 are fixedly connected to a bracket, and a drive motor 32 is fixedly connected to the bracket. The output end of the drive motor 32 is fixedly connected to the upper end of the rotating shaft 4.

[0029] Please see Figure 2 In this embodiment, the cleaning part 6 includes an arc-shaped scraper 61. Several connecting plates are fixedly connected circumferentially at equal intervals above the grid plate 2 on the outer wall of the rotating shaft 4 and located at the upper part. The lower end face of each connecting plate is fixedly connected to an arc-shaped scraper 61 that is attached to the surface of the upper grid plate 2.

[0030] Please see Figure 5 In this embodiment, the variable sealing part 9 includes two outer sealing rings 91 fixedly connected to the inner wall of the collection cylinder 5 along the axial direction of the collection cylinder 5. Two inner sealing rings 92 are rotatably connected to the outer wall of the rotating shaft 4 and located inside the collection cylinder 5 for cooperating with the outer sealing rings 91. The upper end face of the outer sealing ring 91 gradually tilts towards the side closer to the axis of the collection cylinder 5 from top to bottom, and the upper end face of the inner sealing ring 92 tilts away from the axis of the collection cylinder 5 from top to bottom. An elastic sealing ring is fixedly connected to the outer wall of the inner sealing ring 92.

[0031] When filtering groundwater, the electric telescopic rod 31 is in its shortest state, and the rotating shaft 4 is in its lowest position. At this time, the arc-shaped scraper 61 is attached to the surface of the upper grid plate 2, and the lower inner plug ring 92 is inserted into the lower outer plug ring 91, so that the lower part of the collection cylinder 5 is in a blocked state. The elastic sealing ring on the outer wall of the inner plug ring 92 enhances the sealing between it and the outer plug ring 91. At the same time, the inner plug ring 92 and the outer plug ring 91 are interlocked in an interference fit, which further enhances the sealing strength between them. The upper inner plug ring 92 and the outer plug ring 91 are in an up-down misaligned state.

[0032] At this time, the solenoid valves located on the input pipe and the discharge pipe are closed, and the solenoid valves on the inlet pipe and the outlet pipe are opened to pump the groundwater into the inlet pipe. At the same time, the drive motor 32 is controlled to run and drive the rotating shaft 4 to rotate forward. The groundwater first passes through the upper grid plate 2 to filter the large particles of suspended matter mixed in with it, and then passes through the quartz sand filter media to filter the colloids and other impurities in the groundwater. The filtered groundwater is then discharged from the outlet pipe.

[0033] Large particles suspended in the upper grid plate 2 will accumulate on its surface. At this time, the rotating shaft 4 drives the arc-shaped scraper 61 to rotate through the connecting plate. The arc-shaped scraper 61 scrapes the large particles suspended in the grid plate 2 and uses its own arc shape to make the scraped large particles suspended in the upper grid plate 2 gradually move from the outside to the inside until they reach the feed chute 7. Then, they enter the collection cylinder 5 through the feed chute 7 and fall down to the bottom of the collection cylinder 5. This achieves the collection of large particles suspended in the filtration process and ensures the normal filtration function of the upper grid. When the large particles suspended in the collection cylinder 5 come into contact with the inner and outer blocking rings 92 and 91 located at the top, the inclined surfaces of the inner and outer blocking rings 92 and 91 are used to make the large particles suspended in the upper grid plate roll down smoothly, avoiding the accumulation of large particles suspended in the inner and outer blocking rings 92 and 91 during the feeding process.

[0034] During the forward rotation of the shaft 4, the linkage 8 is not activated to link it with the collection cylinder 5, so the collection cylinder 5 is stationary at this time.

[0035] Please see Figure 2 and Figure 3 In this embodiment, the cleaning unit 6 also includes an installation ring 62 fixedly connected to the outer wall of the collection cylinder 5 and located between the two grid discs 2. A plurality of levers 63 are fixedly connected circumferentially at equal intervals on the outer wall of the installation ring 62. The levers 63 are inclinedly distributed. A plurality of fixing frames are fixedly connected circumferentially at equal intervals on the outer wall of the installation ring 62. A plurality of levers 64 are fixedly connected circumferentially at equal intervals on the fixing frames, and the levers 64 on the fixing frames are arranged in two rows.

[0036] Please see Figure 3 and Figure 6 In this embodiment, the linkage part 8 includes a ring seat 81 fixedly connected to the lower part of the collecting cylinder 5. The lower end face of the ring seat 81 is provided with a plurality of mounting grooves equidistantly arranged around the circumference. Each mounting groove is slidably connected with a wedge-shaped tooth 82. A top spring is fixedly connected between the wedge-shaped tooth 82 and the mounting groove. The lower part of the rotating shaft 4 is provided with a waist-shaped through groove. A locking post 83 that cooperates with the wedge-shaped tooth 82 is slidably connected in the waist-shaped through groove. The locking post 83 is distributed perpendicular to the axis of the rotating shaft 4. A limit spring is fixedly connected between the locking post 83 and the waist-shaped through groove.

[0037] When backwashing is required after filtering groundwater, the solenoid valves on the inlet and outlet pipes are closed, and the solenoid valves on the input and discharge pipes are opened. At the same time, the electric telescopic rod 31 is extended and drives the drive motor 32 to rise through the bracket. The drive motor 32 then drives the rotating shaft 4 to rise first, and the rotating shaft 4 then drives the locking pin 83 to move upward. When the rotating shaft 4 moves to the highest point, the locking pin 83 moves upward and engages with the corresponding wedge tooth 82. The upward movement of the rotating shaft 4 also drives the two inner blocking rings 92 to move upward synchronously. The lower inner blocking ring 92 moves upward and separates from the lower outer blocking ring 91, causing large suspended particles collected in the collection cylinder 5 to fall downward. The upper inner blocking ring 92 moves upward and inserts into the upper outer blocking ring 91, sealing the upper part of the collection cylinder 5.

[0038] The backwash water path is connected to the inlet pipe. The backwash water flows into the tank 1 through the inlet pipe. The water flows from bottom to top, impacting and agitating the filter media as it passes through. (The quartz sand filter media between the two layers of grid discs 2 usually does not fill the entire space, but leaves a certain amount of space to ensure that the filter layer can expand and agitate normally and that the water flow is evenly distributed during filtration and backwashing.) At the same time, the water flow further expands and loosens the filter media, cleaning up small suspended particles such as colloids that have been filtered out. Then, the drive motor 32 is controlled to drive the rotating shaft 4 to rotate. The rotating shaft 4 is connected by the locking pin 83 and the wedge-shaped teeth. 82 drives the ring seat 81 to rotate synchronously, the ring seat 81 then drives the collection cylinder 5 to rotate, the collection cylinder 5 then drives the mounting ring 62 to rotate, the mounting ring 62 then drives the deflector plate 63 to rotate, and drives the deflector rod 64 to rotate through the fixed frame. During the rotation of the deflector plate 63, the inclined direction of the deflector plate 63 is used to stir the filter media upward, further causing the filter media to turn upward. The deflector rod stirs the filter media circumferentially. By stirring the filter media in multiple directions, the colloidal impurities attached to the surface of the quartz sand are powerfully and effectively removed. The cleaned impurities flow upward with the water flow and are finally discharged from the discharge pipe.

[0039] After backwashing is completed, the drive motor 32 is paused, and the electric telescopic rod 31 is retracted to move the rotating shaft 4 down to the initial state. Then, the cleaning part 6, the linkage part 8, and the variable sealing part 9 are reset to their pre-filtration positions to filter the groundwater.

[0040] As the collecting cylinder 5 rotates with the rotating shaft 4, it is in constant motion, which further accelerates the discharge of large particulate matter collected during filtration and prevents large particulate matter from accumulating in the inner cavity of the collecting cylinder 5.

[0041] It should be noted that although this invention adds several structures compared to existing quartz sand filters, resulting in a slight increase in device cost, it is significantly more effective than traditional quartz sand filters that rely solely on backwashing to agitate the filter media. Traditional filters cannot remove larger suspended particles beforehand during filtration, leading to rapid clogging of the filter media pores, increased filtration resistance, and shortened filtration time, further increasing operating costs. Furthermore, traditional backwashing methods limit the backwash shear force, insufficiently removing firmly adsorbed colloids and fine particles from the filter media surface. Long-term operation can lead to filter media caking, resulting in incomplete filtration and indirectly increasing cleaning costs. This invention, through a two-stage cleaning method of "cleaning during filtration operation + deep agitation and rinsing during backwashing," makes the filtration and filter media regeneration processes more targeted. This not only significantly extends the filtration cycle and effectively reduces the risk of clogging but also lowers overall operating costs and greatly improves filtration efficiency.

[0042] During operation, groundwater is pumped into tank 1 through the upper inlet pipe. The groundwater flows from top to bottom, passing through the grid disc 2 and filter media for filtration. Large suspended particles are intercepted by the upper grid disc 2, while colloids and other impurities are filtered by the filter media. Then, the control drive unit 3 operates to drive the cleaning process. The cleaning unit 6 scrapes the large suspended particles on the surface of the upper grid disc 2 into the collection cylinder 5. The filtered groundwater is discharged from the outlet pipe. During backwashing, the control drive unit 3 first drives the rotating shaft 4 to move upward. The rotating shaft 4 then triggers the linkage unit 8 to lock the collection cylinder 5 and the rotating shaft 4 together. Then, the drive unit 3 drives the rotating shaft 4 to rotate, and the rotating shaft 4 then drives the cleaning unit 6 through the collection cylinder 5. The cleaning unit 6 flips the filter media in multiple directions to enhance the cleaning effect. The cleaned impurities move upward with the water flow and are finally discharged from the outlet pipe.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A groundwater filtering device comprising a tank body and two grating discs fixedly connected in the longitudinal direction in the inner cavity of the tank body, characterized in that: The upper part of the tank body is provided with a driving part, the driving part is provided with a rotating shaft penetrating the tank body in the longitudinal direction, two grid plates are rotatably connected with the bottom of the tank body and are provided with a collecting cylinder movably sleeved outside the rotating shaft, the rotating shaft and the collecting cylinder are provided with a cleaning part outside the collecting cylinder, a plurality of feeding grooves are equidistantly formed in the outer wall of the upper part of the upper collecting cylinder, a linkage part is arranged between the lower part of the rotating shaft and the lower part of the collecting cylinder, and a variable blocking part is arranged between the rotating shaft and the collecting cylinder. The groundwater filtering device has two working conditions: When the tank body performs filtering operation: the driving part drives the rotating shaft to rotate, and the cleaning part rotates synchronously with the rotating shaft, the large particle suspended matter retained on the surface of the upper grid plate is scraped to be collected to the middle part of the tank body along the surface of the grid plate, and then enters the inside of the collecting cylinder through the feeding groove, at this time, the variable blocking part is in the working position of blocking the lower section of the collecting cylinder to avoid water flowing out from the lower section of the collecting cylinder; When the tank body performs backwashing operation: the driving part first drives the rotating shaft to move upward along the axial direction, triggers the linkage part to operate, and synchronously locks the rotating shaft and the collecting cylinder, then the driving part drives the rotating shaft and the collecting cylinder to synchronously rotate and drives the cleaning part to stir the filter material, the colloidal substance and small impurities attached to the filter material are stirred and released, at this time, the variable blocking part is switched to the working position of blocking the upper section of the collecting cylinder, so that the large particle suspended matter collected during the filtering operation can be released, and water is prevented from flowing out from the upper section of the collecting cylinder.

2. The groundwater filter apparatus of claim 1, wherein: The driving part comprises two electric telescopic rods which are symmetrically and fixedly connected on the upper part of the tank body, the upper ends of the two electric telescopic rods are fixedly connected with a support, a driving motor is fixedly connected on the support, and the output end of the driving motor is fixedly connected with the upper end of the rotating shaft.

3. The groundwater filter of claim 1, wherein: The cleaning part comprises an arc-shaped scraper, a plurality of connecting plates are fixedly connected on the outer wall of the rotating shaft and above the upper grid plate in the upper part in the equidistant manner in the circumferential direction, and the lower end surface of each connecting plate is fixedly connected with an arc-shaped scraper which is attached to the surface of the upper grid plate.

4. A groundwater filter apparatus as claimed in claim 3, wherein: The cleaning part further comprises a mounting ring sleeve which is fixedly connected on the outer wall of the collecting cylinder and between the two grid plates, a plurality of push plates are fixedly connected on the outer wall of the mounting ring sleeve in the equidistant manner in the circumferential direction, a plurality of fixing frames are fixedly connected on the outer wall of the mounting ring sleeve in the equidistant manner, a plurality of push rods are fixedly connected on the fixing frames in the equidistant manner, and the push rods on the fixing frames are arranged in two rows.

5. The groundwater filter of claim 1, wherein: The linkage part comprises a ring seat which is fixedly connected on the lower part of the collecting cylinder, a plurality of installation grooves are equidistantly formed on the lower end surface of the ring seat in the circumferential direction, a wedge-shaped tooth is slidably connected in each installation groove, a top spring is fixedly connected between the wedge-shaped tooth and the installation groove, a waist-shaped through groove is formed in the lower part of the rotating shaft, a clamping column matched with the wedge-shaped tooth is slidably connected in the waist-shaped through groove, the clamping column is distributed perpendicularly to the axis of the rotating shaft, and a limiting spring is fixedly connected between the clamping column and the waist-shaped through groove.

6. The groundwater filter of claim 1, wherein: The variable blocking part comprises two outer blocking rings which are fixedly connected on the inner wall of the collecting cylinder in the axial direction, and two inner blocking rings which are rotatably connected on the outer wall of the rotating shaft and in the internal section of the collecting cylinder are used for cooperating with the outer blocking rings.

7. A groundwater filter apparatus as claimed in claim 6, wherein: The upper end surface of the outer blocking ring is inclined from top to bottom towards one side close to the axis of the collecting cylinder, and the upper end surface of the inner blocking ring is inclined from top to bottom towards one side away from the axis of the collecting cylinder, and the outer wall of the inner blocking ring is fixedly connected with an elastic sealing ring.

8. The groundwater filter of claim 1, wherein: The bottom of the feeding groove is inclined from top to bottom towards one side close to the rotating shaft.

9. The groundwater filter of claim 1, wherein: The upper end side of the collecting cylinder is fixedly connected with a support disc movably sleeved outside the rotating shaft.

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