A filtration device and method of operation thereof

Abstract

The application discloses a filtering device and a working method thereof. The filtering device comprises a shell, a multistage filtering part arranged in the shell; the multistage filtering part comprises a sleeve assembly, a flow pipe arranged in the shell, a rolling roller arranged in the flow pipe, a driving shaft inserted into the rolling roller, a backflow port, a water inlet and an inner cavity blowdown port formed in the flow pipe; the multistage filtering part comprises a first filtering part, a second filtering part and a third filtering part, the first filtering part and the second filtering part are sleeved on the flow pipe, and the third filtering part is sleeved on the second filtering part and fixed on the flow pipe; the second filtering part is sleeved on the first filtering part; the backflow port is communicated with the second filtering part, and a blocking leaf is hinged to the inner wall of the flow pipe at the backflow port. The design of the backflow port and the blocking leaf of the sleeve assembly enables water to be filtered by the first filtering part, the second filtering part and the third filtering part in sequence when the water enters, and sewage can be discharged alone when the sewage is discharged, so that the sewage can be discharged simultaneously without affecting the filtering work.

Description

Technical Field

[0001] This invention relates to the field of environmental protection, specifically to a filtration device and its working method. Background Technology

[0002] As the steel industry continues to develop, water treatment is also constantly being reformed.

[0003] The original turbid circulating water treatment process, which combined conventional chemical oil separators with inclined plate sedimentation tanks, had the following drawbacks: large footprint, large system investment, need to add water storage tanks and secondary booster pumps, resulting in high energy consumption; and it also increased the number of operators.

[0004] Therefore, in order to save energy and improve economic efficiency, the original conventional design of chemical oil separator and inclined plate sedimentation was reformed into a pressure-type mixed filtration and sedimentation process (commonly known as pressure-integrated process).

[0005] However, in use, it is generally divided into multi-stage filtration (three stages are the most common), and the filter elements of the multi-stage filtration are nested one on top of the other. Although this nesting method makes the filtration effect better, after long-term use, even if the multi-stage filter elements are cleaned by backwashing, because the second-stage filter element is nested on the first-stage filter element, and the third-stage filter element is nested on the second-stage filter element, the impurities in the second-stage filter element are blocked by the third-stage filter element and the first-stage filter element during backwashing, which cannot complete the backwashing cleaning work effectively. This results in more impurities adhering to the second-stage filter element, affecting the filtration effect, and gradually affecting the operation of the first-stage and third-stage filter elements. Summary of the Invention

[0006] Purpose of the invention: To provide a filtration device and its working method to solve the above-mentioned problems existing in the prior art.

[0007] Technical solution: A filtration device, comprising:

[0008] The housing, and the multi-stage filtration unit disposed within the housing;

[0009] The multi-stage filtration unit includes:

[0010] The sleeve assembly includes a flow tube disposed within the housing, a rolling roller located within the flow tube, and a drive shaft inserted into the rolling roller. The flow tube has a return port, a water inlet, and an internal drain port.

[0011] The multi-stage filter element includes a primary filter element, a secondary filter element, and a tertiary filter element, which are sleeved on the flow tube and fixed to the flow tube.

[0012] The secondary filter element is fitted onto the primary filter element;

[0013] The return port is connected to the secondary filter element, and a blocking hinge is hinged to the inner wall of the flow tube at the return port;

[0014] The bottom of the three-stage filter element is connected to an external drain pipe extending outside the housing.

[0015] The design of the return port and the blocking hinge of the sleeve assembly allows water to be filtered step by step through the primary filter, secondary filter, and tertiary filter when it enters. When the sewage is discharged, it can be discharged separately, completing the sewage discharge simultaneously without affecting the filtration operation.

[0016] This invention completes the filtration of water by designing a multi-stage filtration system. At the same time, it designs separate drain outlets for the primary, secondary and tertiary filter elements, thereby reducing secondary pollution of the internal water during sewage discharge.

[0017] The design of the sleeve assembly drives the primary and secondary filters to perform reverse water washing, which improves the self-cleaning effect of the primary and secondary filters. While the sleeve assembly is designed to work in conjunction with the primary and secondary filters, it does not affect the individual sewage discharge of the primary, secondary and tertiary filters.

[0018] A rolling roller was also designed to prevent large particles of impurities in the water from clogging the filter.

[0019] In a further embodiment, one end of the flow tube is closed, an elliptical cavity is formed inside the flow tube, a movable groove is formed on the inner wall of the flow tube, a gear frame is installed at the end of the flow tube, and a transmission gear is sleeved at the end of the gear frame.

[0020] In a further embodiment, the rolling roller is hollow, with a roller body toothed ring installed inside, and rotary sealing rings adapted to the drive shaft installed at both ends;

[0021] The outer wall of the rolling roller is equipped with a roller pressing wall, and the top is equipped with a slide frame that is adapted to the movable slide groove.

[0022] The roller wall abuts against the inner wall of the elliptical chamber. When the roller rotates, the roller wall will intermittently contact the elliptical chamber of the flow tube to crush large particles of impurities in the water and prevent large particles from clogging the filter.

[0023] The slide was designed to prevent the drive shaft from lifting the compaction roller during its upward movement. The design of the slide and the movable slide groove allows the compaction roller to rotate inside the flow tube.

[0024] To make rotation smoother, ball bearings can be embedded in the carriage to reduce the friction area.

[0025] It can also be achieved using bearings, but immersing bearings in water containing impurities has issues with their lifespan. A better approach is to design a rotating sealing ring fitted onto the roller near the bottom of the flow tube, dividing the flow tube into upper and lower chambers. The bearing fitted onto the roller can then be designed in the lower chamber.

[0026] In a further embodiment, a secondary drive gear, a primary drive gear, a roller drive gear, and an output gear are sequentially mounted on the drive shaft;

[0027] The secondary drive gear meshes with the transmission gear, and the roller drive gear meshes with the roller ring gear.

[0028] In a further embodiment, a lifting cylinder and a drive motor are installed at the bottom of the housing, and the output end of the lifting cylinder is connected to the drive shaft.

[0029] The output end of the drive motor is fitted with an input gear that meshes with the output gear.

[0030] In a further embodiment, the primary filter, secondary filter, and tertiary filter have predetermined shapes;

[0031] The inner wall of the primary filter element is fitted with a primary filter toothed ring that meshes with the primary drive gear.

[0032] The top of the inner wall of the secondary filter element is equipped with a secondary filter toothed ring that meshes with the transmission gear.

[0033] The primary, secondary, and tertiary filter elements are made of filter materials, which may include filter cotton or filter screens and other filter media.

[0034] The first-stage filter element is sealed at the bottom, the second-stage filter element is sealed at the top, and the third-stage filter element is sealed at the bottom.

[0035] In a further embodiment, a hull bottom is installed at the bottom of the shell, and the hull bottom is connected to an internal sewage pipe extending to the outside of the shell, and an internal sewage valve is provided on the internal sewage pipe;

[0036] The top of the housing is fitted with a multi-layered honeycomb filter filling layer.

[0037] In a further embodiment, a water inlet pipe extending to the outside of the housing is connected to the water inlet, and a water pump is provided on the water inlet pipe;

[0038] The inner cavity drain port is connected to an inner cavity drain pipe extending to the outside of the shell, and the inner cavity drain pipe is equipped with an inner cavity drain valve.

[0039] In a further embodiment, the inlet pipe is connected to a sedimentation tank, and the external drain pipe is equipped with an external drain valve.

[0040] A working method includes: a filtration method and a cleaning method;

[0041] The filtering method includes:

[0042] Step 11: During filtration, the water in the sedimentation tank is pumped into the inlet pipe by the water pump, enters the flow pipe through the inlet, and enters the primary filter, secondary filter and tertiary filter for filtration. As the water volume gradually increases, the water level in the shell continues to rise. After being filtered again through the honeycomb filter filling layer, the water is led out to the designated location through the storage port.

[0043] Step 12: During step 11, water is continuously present in the flow tube and is under positive pressure, which prevents the hinge from adhering to the inner wall of the flow tube. The water passes through the primary filter, then enters the secondary filter, and finally enters the tertiary filter.

[0044] Step 13: During step 11, the drive motor drives the input gear to rotate, drives the output gear to rotate, drives the drive shaft to rotate, drives the roller drive gear to rotate, drives the roller gear ring to rotate, drives the crushing roller to rotate, and drives the roller wall to intermittently contact the elliptical cavity, thereby crushing large particles of impurities in the water into small particles.

[0045] In filtration methods, appropriate reagents can be added to enhance filtration and sedimentation effects.

[0046] The cleaning method includes:

[0047] Step 21: During cleaning, turn off the water pump and cut off the flow of water in the inlet pipe. At this time, there is water in the shell. The lifting cylinder works, driving the drive shaft to rise, which in turn drives the roller drive gear, the first-stage drive gear, and the second-stage drive gear to rise, so that the roller drive gear disengages from the roller tooth ring, and the first-stage drive gear and the second-stage drive gear mesh with the first-stage filter tooth ring and the second-stage filter tooth ring, respectively.

[0048] Step 22: The drive motor drives the input gear to rotate, which in turn drives the output gear to rotate, which in turn drives the drive shaft to rotate. This causes the primary and secondary filters to rotate in opposite directions, allowing them to self-clean within the water. Simultaneously, the rotation of the secondary filter causes turbulence in the water between the tertiary and secondary filters, thus cleaning the inner wall of the tertiary filter.

[0049] Step 23: Open the inner cavity drain valve and the outer cavity drain valve. The water between the secondary filter and the primary filter will flush away the obstruction hinge. The sewage and impurities between the secondary filter and the primary filter will be discharged into the flow pipe through the return port, and then into the inner cavity drain pipe through the inner cavity drain port, and finally discharged out of the shell.

[0050] Water at the inner wall of the primary filter element is directly discharged into the flow pipe and then discharged outside the shell;

[0051] The water between the third-stage filter and the second-stage filter is discharged to the outside of the shell through the external drain pipe.

[0052] Step 24: After the water between the primary, secondary, and tertiary filters has been drained, open the drain valve inside the chamber to drain the water from the bottom of the shell.

[0053] This method allows for the separate discharge of water containing impurities from the inner wall of the primary filter element, the area between the primary and secondary filters, and the area between the secondary and tertiary filters. It reduces the re-adhesion of impurities from the inner wall of the secondary filter element onto the outer wall of the primary filter element, as well as the re-adhesion of impurities from the inner wall of the tertiary filter element onto the outer wall of the secondary filter element.

[0054] During the cleaning process, when the water supply is insufficient, water is introduced from the outside. The water is introduced into the shell through the outlet and is then connected to an external pump and water source.

[0055] Beneficial effects: This invention discloses a filtration device and its working method. This invention completes the filtration of water by designing a multi-stage filtration section. At the same time, it designs separate drain outlets for the primary, secondary and tertiary filter elements, so as to reduce secondary pollution of the internal water body during sewage discharge.

[0056] The design of the sleeve assembly drives the primary and secondary filters to perform reverse water washing, which improves the self-cleaning effect of the primary and secondary filters. While the sleeve assembly is designed to work in conjunction with the primary and secondary filters, it does not affect the individual sewage discharge of the primary, secondary and tertiary filters.

[0057] A rolling roller was also designed to prevent large particles of impurities in the water from clogging the filter. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the structure of the present invention.

[0059] Figure 2 This is a schematic diagram of the multi-stage filtration section of the present invention.

[0060] Figure 3 This is a schematic diagram of the first, second, and third stage filter components of the present invention.

[0061] Figure 4 This is a cross-sectional structural diagram of the multi-stage filtration section of the present invention.

[0062] Figure 5 This is a schematic diagram of the multi-stage filtration component structure of the present invention.

[0063] Figure 6 This is a cross-sectional structural diagram of the multi-stage filtration section of the present invention.

[0064] The attached figures are labeled as follows:

[0065] 1. Shell; 11. Honeycomb filter filling layer; 12. Outlet; 13. Bottom of the tank; 14. Internal sewage pipe;

[0066] 2. Multi-stage filtration section; 21. Primary filter element; 211. Primary filter toothed ring; 22. Secondary filter element; 221. Secondary filter toothed ring; 23. Tertiary filter element;

[0067] 24. Flow pipe; 241. Gear frame; 242. Transmission gear; 243. Return port; 243A. Blocking hinge; 244. Water inlet; 245. Internal drain port; 246. Movable chute;

[0068] 25. Roller; 251. Carriage; 252. Roller wall; 253. Roller toothed ring; 254. Rotary sealing ring;

[0069] 26. Drive shaft; 261. Secondary drive gear; 262. Primary drive gear; 263. Roller drive gear; 264. Output gear; 265. Lifting cylinder; 266. Drive motor; 267. Input gear;

[0070] 31. External drain pipe; 32. Inlet pipe; 33. Internal drain pipe. Detailed Implementation

[0071] This application relates to a filtration device and its working method, which will be explained in detail below through specific embodiments.

[0072] A filtration device, comprising:

[0073] Housing 1, and a multi-stage filter section 2 disposed within the housing 1;

[0074] The multi-stage filtration unit 2 includes:

[0075] The sleeve assembly includes a flow tube 24 disposed within the housing 1, a rolling roller 25 located within the flow tube 24, and a drive shaft 26 inserted into the rolling roller 25. The flow tube 24 has a return port 243, a water inlet 244, and an inner cavity drain port 245.

[0076] One end of the flow tube 24 is closed, and an elliptical cavity is opened inside the flow tube 24. A movable sliding groove 246 is opened on the inner wall of the flow tube 24. A gear frame 241 is installed at the end of the flow tube 24, and a transmission gear 242 is sleeved on the end of the gear frame 241.

[0077] The rolling roller 25 is hollow, with a roller toothed ring 253 installed inside, and a rotary sealing ring 254 adapted to the drive shaft 26 installed at both ends;

[0078] The outer wall of the rolling roller 25 is equipped with a roller pressing wall 252, and the top is equipped with a slide 251 that is adapted to the movable slide 246.

[0079] The roller wall 252 abuts against the inner wall of the elliptical chamber. When the roller 25 rotates, the roller wall 252 will intermittently contact the elliptical chamber of the flow tube 24 to complete the crushing of large particles of impurities in the water and prevent large particles from clogging the filter element.

[0080] Meanwhile, the slide 251 is designed to prevent the drive shaft 26 from driving the pressing roller 25 to rise during the upward movement. At the same time, the design of the slide 251 and the movable slide 246 allows the pressing roller 25 to rotate inside the flow tube 24.

[0081] To make the rotation smoother, ball bearings can be embedded in the carriage 251 to reduce the friction area.

[0082] It can also be achieved using bearings, but immersing the bearings in water containing impurities has a lifespan issue. A better approach is to design a rotating sealing ring fitted onto the rolling roller 25 near the bottom of the flow tube 24, dividing the flow tube 24 into upper and lower chambers. The bearing fitted onto the rolling roller 25 can then be designed in the lower chamber.

[0083] The drive shaft 26 is sequentially equipped with a secondary drive gear 261, a primary drive gear 262, a roller drive gear 263, and an output gear 264.

[0084] The secondary drive gear 261 meshes with the transmission gear 242, and the roller drive gear 263 meshes with the roller ring gear 253.

[0085] A lifting cylinder 265 and a drive motor 266 are installed at the bottom of the housing 1, and the output end of the lifting cylinder 265 is connected to the drive shaft 26.

[0086] The output end of the drive motor 266 is fitted with an input gear 267 that meshes with the output gear 264.

[0087] The multi-stage filter element includes a primary filter element 21 and a secondary filter element 22 sleeved on the flow tube 24, and a tertiary filter element 23 sleeved on the secondary filter element 22 and fixed on the flow tube 24.

[0088] The secondary filter element 22 is fitted onto the primary filter element 21;

[0089] The return port 243 is connected to the secondary filter element 22, and the inner wall of the flow tube 24 is hinged with a blocking hinge 243A at the return port 243.

[0090] The bottom of the three-stage filter element 23 is connected to an external drain pipe 31 that extends to the outside of the housing 1.

[0091] The design of the return port 243 and the blocking hinge 243A of the sleeve assembly allows water to be filtered step by step through the primary filter element 21, the secondary filter element 22, and the tertiary filter element 23 when it enters. When the sewage is discharged, it can be discharged separately, and sewage can be discharged simultaneously without affecting the filtration work.

[0092] The present invention completes the filtration of water by designing a multi-stage filtration unit 2. At the same time, it designs separate drain outlets for the primary filter element 21, the secondary filter element 22 and the tertiary filter element 23, so as to reduce secondary pollution of the internal water during the discharge.

[0093] The sleeve assembly is designed to drive the primary filter element 21 and the secondary filter element 22 to perform reverse water washing, which makes the self-cleaning effect of the primary filter element 21 and the secondary filter element 22 better. The sleeve assembly is designed to work in conjunction with the primary filter element 21 and the secondary filter element 22, without affecting the individual sewage discharge of the primary filter element 21, the secondary filter element 22 and the tertiary filter element 23.

[0094] Meanwhile, a roller 25 was designed to prevent large particles of impurities in the water from clogging the filter.

[0095] The primary filter element 21, the secondary filter element 22, and the tertiary filter element 23 have predetermined shapes;

[0096] The inner wall of the primary filter element 21 is fitted with a primary filter toothed ring 211 that meshes with the primary drive gear 262;

[0097] The top of the inner wall of the secondary filter element 22 is equipped with a secondary filter toothed ring 221 that meshes with the transmission gear 242.

[0098] The primary filter element 21, the secondary filter element 22, and the tertiary filter element 23 are made of filter materials, which may include filter cotton or filter screens and other filter media.

[0099] The first-stage filter element 21 is sealed at the bottom, the second-stage filter element 22 is sealed at the top, and the third-stage filter element 23 is sealed at the bottom.

[0100] The bottom of the shell 1 is equipped with a bottom compartment 13, and the bottom compartment 13 is connected to an internal sewage pipe 14 extending to the outside of the shell 1. An internal sewage valve is provided on the internal sewage pipe 14.

[0101] The top of the housing 1 is fitted with a multi-layer honeycomb filter filling layer 11.

[0102] The inlet 244 is connected to an inlet pipe 32 extending to the outside of the housing 1, and a water pump is provided on the inlet pipe 32;

[0103] The inner cavity drain port 245 is connected to an inner cavity drain pipe 33 extending to the outside of the housing 1, and the inner cavity drain pipe 33 is provided with an inner cavity drain valve.

[0104] The inlet pipe 32 is connected to the sedimentation tank, and the external cavity drain pipe 31 is equipped with an external cavity drain valve.

[0105] A working method includes: a filtration method and a cleaning method;

[0106] The filtering method includes:

[0107] Step 11: During filtration, the water in the sedimentation tank is pumped into the inlet pipe 32 by the water pump, enters the flow pipe 24 through the inlet 244, and enters the primary filter element 21, the secondary filter element 22, and the tertiary filter element 23 for filtration. As the water volume gradually increases, the water level in the shell 1 continues to rise. After being filtered again through the honeycomb filter filling layer 11, the water is led out to the designated location through the water storage port.

[0108] Step 12: During step 11, water is continuously present in the flow tube 24 and is under positive pressure. The blocking hinge 243A adheres to the inner wall of the flow tube 24. The water passes through the primary filter element 21, then enters the secondary filter element 22, and finally enters the tertiary filter element 23.

[0109] Step 13: During step 11, the drive motor 266 drives the input gear 267 to rotate, drives the output gear 264 to rotate, drives the drive shaft 26 to rotate, drives the roller drive gear 263 to rotate, drives the roller gear ring 253 to rotate, drives the crushing roller 25 to rotate, and drives the roller wall 252 to intermittently contact the elliptical chamber, thereby crushing large particles of impurities in the water and crushing them into small particles.

[0110] In filtration methods, appropriate reagents can be added to enhance filtration and sedimentation effects.

[0111] The cleaning method includes:

[0112] Step 21: During cleaning, turn off the water pump and cut off the flow of water in the inlet pipe 32. At this time, there is water in the housing 1. The lifting cylinder 265 works, driving the drive shaft 26 to rise, which in turn drives the roller drive gear 263, the first-stage drive gear 262, and the second-stage drive gear 261 to rise, so that the roller drive gear 263 disengages from the roller tooth ring 253, and the first-stage drive gear 262 and the second-stage drive gear 261 mesh with the first-stage filter tooth ring 211 and the second-stage filter tooth ring 221, respectively.

[0113] Step 22: The drive motor 266 drives the input gear 267 to rotate, which in turn drives the output gear 264 to rotate, which in turn drives the drive shaft 26 to rotate. This causes the primary filter element 21 and the secondary filter element 22 to rotate in opposite directions, so that the primary filter element 21 and the secondary filter element 22 can self-clean in the water. At the same time, the rotation of the secondary filter element 22 will cause turbulence in the water between the tertiary filter element 23 and the secondary filter element 22, and complete the cleaning of the inner wall of the tertiary filter element 23.

[0114] Step 23: Open the inner cavity drain valve and the outer cavity drain valve. The water between the secondary filter element 22 and the primary filter element 21 flushes away the blocking hinge 243A. The sewage and impurities between the secondary filter element 22 and the primary filter element 21 are discharged into the flow pipe 24 through the return port 243, and then into the inner cavity drain pipe 33 through the inner cavity drain port 245, and then discharged out of the shell 1.

[0115] The water inside the primary filter element 21 is directly discharged into the flow pipe 24 and then discharged out of the shell 1;

[0116] The water between the third-stage filter element 23 and the second-stage filter element 22 is discharged to the outside of the shell 1 through the external drain pipe 31.

[0117] Step 24: After the water between the primary filter element 21, the secondary filter element 22, and the tertiary filter element 23 has been drained, open the drain valve inside the chamber to drain the water at the bottom of the shell 1.

[0118] In this way, water containing impurities can be discharged separately from the inner wall of the primary filter element 21, between the primary filter element 21 and the secondary filter element 22, and between the secondary filter element 22 and the tertiary filter element 23. This reduces the re-attachment of impurities from the inner wall of the secondary filter element 22 to the outer wall of the primary filter element 21, and the re-attachment of impurities from the inner wall of the tertiary filter element 23 to the outer wall of the secondary filter element 22.

[0119] During the cleaning process, when the water is insufficient, water is introduced from the outside. The water is introduced into the housing 1 through the outlet 12 and is connected to an external pump and water source.

[0120] Working principle explanation:

[0121] During filtration, the water in the sedimentation tank is pumped into the inlet pipe 32 by the water pump, enters the flow pipe 24 through the inlet 244, and enters the primary filter element 21, the secondary filter element 22, and the tertiary filter element 23 for filtration. As the water volume gradually increases, the water level in the shell 1 continues to rise. After being filtered again through the honeycomb filter filling layer 11, the water is led out to the designated location through the water storage port.

[0122] Water is continuously present in the flow tube 24 and is under positive pressure. The blocking hinge 243A adheres to the inner wall of the flow tube 24. The water passes through the primary filter element 21, then enters the secondary filter element 22, and finally enters the tertiary filter element 23.

[0123] The drive motor 266 drives the input gear 267 to rotate, which in turn drives the output gear 264 to rotate, which in turn drives the drive shaft 26 to rotate, which in turn drives the roller drive gear 263 to rotate, which in turn drives the roller tooth ring 253 to rotate, which in turn drives the crushing roller 25 to rotate, which in turn drives the roller wall 252 to intermittently contact the elliptical chamber, thereby crushing large particles of impurities in the water into small particles.

[0124] In filtration methods, appropriate reagents can be added to enhance filtration and sedimentation effects.

[0125] During cleaning, the water pump is turned off, and the flow of water in the inlet pipe 32 is cut off. At this time, there is water in the housing 1. The lifting cylinder 265 works, driving the drive shaft 26 to rise, which in turn drives the roller drive gear 263, the first-stage drive gear 262, and the second-stage drive gear 261 to rise, causing the roller drive gear 263 to disengage from the roller tooth ring 253, and causing the first-stage drive gear 262 and the second-stage drive gear 261 to mesh with the first-stage filter tooth ring 211 and the second-stage filter tooth ring 221, respectively.

[0126] Then, the drive motor 266 drives the input gear 267 to rotate, which in turn drives the output gear 264 to rotate, which in turn drives the drive shaft 26 to rotate. This causes the primary filter element 21 and the secondary filter element 22 to rotate in opposite directions, so that the primary filter element 21 and the secondary filter element 22 can self-clean in the water. At the same time, the rotation of the secondary filter element 22 will cause turbulence in the water between the tertiary filter element 23 and the secondary filter element 22, and complete the cleaning of the inner wall of the tertiary filter element 23.

[0127] Open the inner cavity drain valve and the outer cavity drain valve. The water between the secondary filter element 22 and the primary filter element 21 flushes away the blocking hinge 243A. The sewage and impurities between the secondary filter element 22 and the primary filter element 21 are discharged into the flow pipe 24 through the return port 243, and then discharged into the inner cavity drain pipe 33 through the inner cavity drain port 245, and finally discharged out of the shell 1.

[0128] The water inside the primary filter element 21 is directly discharged into the flow pipe 24 and then discharged out of the shell 1;

[0129] The water between the third-stage filter element 23 and the second-stage filter element 22 is discharged to the outside of the shell 1 through the external drain pipe 31.

[0130] After the water between the primary filter element 21, the secondary filter element 22, and the tertiary filter element 23 has been drained, open the drain valve inside the chamber to drain the water from the bottom of the shell 1.

[0131] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A filtration device, comprising: The housing, and the multi-stage filtration unit disposed within the housing; The multi-stage filtration unit is characterized by comprising: The sleeve assembly includes a flow tube disposed within the housing, a rolling roller located within the flow tube, and a drive shaft inserted into the rolling roller. The flow tube has a return port, a water inlet, and an internal drain port. The multi-stage filter element includes a primary filter element, a secondary filter element, and a tertiary filter element, which are sleeved on the flow tube and fixed to the flow tube. The secondary filter element is fitted onto the primary filter element; The return port is connected to the secondary filter element, and a blocking hinge is hinged to the inner wall of the flow tube at the return port; The bottom of the three-stage filter element is connected to an external drain pipe extending outside the housing; One end of the flow tube is closed, an elliptical cavity is opened inside the flow tube, a movable sliding groove is opened on the inner wall of the flow tube, a gear frame is installed at the end of the flow tube, and a transmission gear is sleeved at the end of the gear frame. The rolling roller is hollow, with a roller toothed ring installed inside, and rotary sealing rings adapted to the drive shaft installed at both ends; The outer wall of the rolling roller is equipped with a roller pressing wall, and the top is equipped with a slide frame that is compatible with the movable slide groove; The drive shaft is sequentially equipped with a secondary drive gear, a primary drive gear, a roller drive gear, and an output gear. The secondary drive gear meshes with the transmission gear, and the roller body drive gear meshes with the roller body ring gear. A lifting cylinder and a drive motor are installed at the bottom of the housing, and the output end of the lifting cylinder is connected to the drive shaft. The output end of the drive motor is fitted with an input gear that meshes with the output gear; The inner wall of the primary filter element is fitted with a primary filter tooth ring that meshes with the primary drive gear. The top of the inner wall of the secondary filter element is equipped with a secondary filter toothed ring that meshes with the transmission gear.

2. The filtration device according to claim 1, characterized in that: The primary, secondary, and tertiary filter elements have predetermined shapes.

3. The filtration device according to claim 1, characterized in that: The bottom of the shell is equipped with a hull bottom, which is connected to an internal sewage pipe extending to the outside of the shell. An internal sewage valve is provided on the internal sewage pipe. The top of the housing is fitted with a multi-layered honeycomb filter filling layer.

4. The filtration device according to claim 1, characterized in that: A water inlet pipe extending to the outside of the housing is connected to the water inlet, and a water pump is installed on the water inlet pipe; The inner cavity drain port is connected to an inner cavity drain pipe extending to the outside of the shell, and the inner cavity drain pipe is equipped with an inner cavity drain valve.

5. A filtration device according to claim 4, characterized in that: The inlet pipe is connected to the sedimentation tank, and the external drain pipe is equipped with an external drain valve.

6. A method for operating a filtration device, implemented based on the filtration device according to any one of claims 1-5, characterized in that, include: Filtration and cleaning methods; The filtering method includes: Step 11: During filtration, the water in the sedimentation tank is pumped into the inlet pipe by the water pump, enters the flow pipe through the inlet, and enters the primary filter, secondary filter and tertiary filter for filtration. As the water volume gradually increases, the water level in the shell continues to rise. After being filtered again through the honeycomb filter filling layer, the water is led out to the designated position through the outlet. The cleaning method includes: Step 21: During cleaning, turn off the water pump and cut off the flow of water in the inlet pipe. At this time, there is water in the housing. The lifting cylinder works and drives the drive shaft to rise, so that the first-stage drive gear and the second-stage drive gear mesh with the first-stage filter ring and the second-stage filter ring, respectively. Step 22: Drive the drive shaft to rotate by the drive motor, causing the primary and secondary filter elements to rotate in opposite directions, so that the primary and secondary filter elements can self-clean in the water. At the same time, the rotation of the secondary filter element will cause turbulence in the water between the tertiary filter element and the secondary filter element, and complete the cleaning of the inner wall of the tertiary filter element. Step 23: Open the inner cavity drain valve and the outer cavity drain valve. The water between the secondary filter and the primary filter will flush away the obstruction hinge. The sewage and impurities between the secondary filter and the primary filter will be discharged into the flow pipe through the return port and into the inner cavity drain pipe through the inner cavity drain port, and then discharged out of the shell. Water at the inner wall of the primary filter element is directly discharged into the flow pipe and then out of the shell. The water between the third-stage filter and the second-stage filter is discharged to the outside of the shell through the external drain pipe. Step 24: After the water between the primary, secondary, and tertiary filters has been drained, open the drain valve inside the chamber to drain the water from the bottom of the shell.

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