Multi-filtering device for wastewater treatment

Abstract

The invention provides a multi-filtering device for wastewater treatment, and belongs to the technical field of wastewater treatment.The multi-filtering device comprises a filtering box, a filtering mechanism and a power mechanism, a water injection opening is formed in the left side of the top end of the filtering box, the bottom end of the water injection opening communicates with a flow channel, and the output end of the flow channel communicates with a drainage pipe; a filtering groove is formed in the right side of the top end of the filtering box in an open mode, and a mounting cavity is formed in the bottom end in the filtering box. Through water flow self-driving and continuous grading filtering technologies, the problems of high energy consumption and incomplete filtering caused by blockage of traditional wastewater treatment equipment are effectively solved. The water wheel driving and automatic cleaning system is utilized, and the filter element continuously rotates and works cooperatively with the brush, so that the mechanical wear and the energy consumption are obviously reduced. Meanwhile, due to the modular design, the filter element is more convenient to disassemble and replace, and the maintenance efficiency and the overall operation reliability of the equipment are improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a multiple filtering device for wastewater treatment. Background Art

[0002] At present, physical, chemical and biological methods are widely used in wastewater treatment, and multiple filtration technology has become an important means to improve treatment efficiency because it can achieve continuous and hierarchical wastewater purification in one device. For example, CN217119535U discloses a multiple filtration type wastewater treatment device, which sets four filter plates to make wastewater pass through multiple stages of filtration in one device, and cooperates with flow rate sensors to monitor the water outlet speed of the drain pipe, so as to improve the problem of reduced filtration speed caused by blockage during multiple filtration and subsequent sterilization and disinfection of wastewater. The device is designed with an automatic cleaning function. When the water outlet flow rate of the drain pipe is detected to decrease, the servo motor is started to drive the screw and the brush to remove the blockage on the surface of the filter plate, and the mesh provided on the collection box is used to slowly filter the blockage, so as to retain the moisture in the blockage as much as possible and avoid the waste of water resources due to frequent cleaning.

[0003] Although this technology has certain advantages in improving wastewater treatment efficiency and realizing automatic control, it still has the following shortcomings: 1. Frequent startup and operation of the servo motor and brush may lead to high energy consumption, thereby increasing the overall operating cost of the equipment. In addition, frequent mechanical startup and shutdown may also have an adverse effect on the life of the equipment; 2. The screw and the sleeve are both set inside the filter box. They are easily rusted due to long-term sewage erosion. At the same time, impurities and particulate matter in the wastewater are easily embedded in the screw thread, causing the sleeve to jam when moving, thereby affecting the stability and efficiency of the automatic cleaning function; 3. The four filter plates are fixedly installed inside the filter box. This structural design is extremely inconvenient when replacing or maintaining the filter plates, which reduces the maintenance efficiency of the equipment and is not conducive to timely replacement or upgrading of the filter medium to meet different wastewater treatment needs. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is: how to design a multiple filtration device for wastewater treatment, which can not only reduce the high energy consumption and operating costs caused by the frequent start-up of the servo motor and the brush, but also avoid the internal screw from rusting and the thread sleeve from getting stuck, and realize the convenient replacement of the filter plate, thereby improving the maintenance efficiency and use stability of the equipment.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a multiple filtration device for wastewater treatment, comprising:

[0008] A filter box, wherein a water inlet is provided on the left side of the top of the filter box, a flow channel is connected to the bottom end of the water inlet, a drain pipe is connected to the output end of the flow channel, a filter tank is provided on the right side of the top of the filter box, and a mounting cavity is provided at the bottom end of the filter box;

[0009] The filtering mechanism comprises three coaxially arranged filter cartridges rotatably connected to the inside of the filter tank, wherein the three filter cartridges are arranged in sequence with equal spacing in a manner of gradually increasing diameter from the inside to the outside; wherein a primary filter cartridge is fixed on the outer surface of the innermost filter cartridge, a fine filter cartridge is fixed on the outer surface of the middle filter cartridge, and an ultra-fine filter cartridge is fixed on the outer surface of the outermost filter cartridge, forming a multi-stage filtering structure with gradually increasing filtering accuracy from the inside to the outside; and,

[0010] The power mechanism includes a water wheel rotatably connected to the intersection of the water inlet and the flow channel, a driving shaft is fixedly connected to the center of the water wheel, the bottom end of the driving shaft extends to the installation cavity and is fixedly connected to a driving gear, the right side of the driving gear is sequentially connected to the first turntable, the second turntable and the third turntable through a transmission component, wherein the first turntable is located above the second turntable, the second turntable is located above the third turntable, and a power transmission component is arranged at the center of the first turntable, the second turntable and the third turntable, and the power transmission component is transmission-connected to the three filter cartridge holders.

[0011] As a preferred solution of the multiple filtration device for wastewater treatment described in the present invention, the drain pipe adopts a retractable hose, the output end of which extends to the center position above the innermost filter element holder, and a drain outlet is opened on the right side of the bottom of the filter tank.

[0012] As a preferred solution of the multi-filtration device for wastewater treatment of the present invention, the three groups of filter cartridge holders all include a bottom plate, vertical plates are symmetrically installed on the left and right sides of the top of the bottom plate, and blocks are fixedly installed on the tops of the two vertical plates, and the tops of the two blocks are clamped with fixing rings;

[0013] The primary filter element, fine filter element and ultra-fine filter element are respectively embedded in the three groups of filter element holders, wherein the cylindrical outer wall of each filter element fits with the outer side walls of the corresponding two vertical plates, the bottom end of the filter element is clamped on the surface of the bottom plate, and the top end is axially fixed by the interference fit of the fixing ring.

[0014] As a preferred embodiment of the multiple filtering device for wastewater treatment described in the present invention, the transmission component includes a first transmission shaft, a second transmission shaft and a third transmission shaft rotatably connected in the installation cavity, a middle driven gear is fixedly installed at the center of the outer surface of the first transmission shaft, and the left end of the middle driven gear is meshed with the driving gear, and the right end is meshed with the second turntable, the upper ends of the outer surfaces of the second transmission shaft and the third transmission shaft are respectively installed with the first upper driven gear and the second upper driven gear, the lower ends of the outer surfaces of the second transmission shaft and the third transmission shaft are respectively installed with the first lower driven gear and the second lower driven gear, and the left sides of the first upper driven gear and the first lower driven gear are both meshed with the driving gear, and the right sides are respectively meshed with the second upper driven gear and the second lower driven gear, the right side of the second upper driven gear is meshed with the first turntable, and the right side of the second lower driven gear is meshed with the third turntable.

[0015] As a preferred embodiment of the multiple filtration device for wastewater treatment described in the present invention, the power transmission assembly includes a first drum fixedly mounted at the center of the top end of the first turntable, a second drum mounted at the center of the top end of the second turntable, and a rotating column mounted at the center of the top end of the third turntable; wherein the centers of the first drum and the second drum are both hollow, the top end of the first drum passes through the mounting cavity and extends into the filter tank, the top end of the second drum passes through the first drum and is coaxially sleeved, its top end extends into the filter tank and is arranged higher than the top end of the first drum, the rotating column passes through the second drum and is coaxially sleeved, its top end extends into the filter tank and is arranged higher than the top end of the second drum.

[0016] As a preferred solution of the multiple filtration device for wastewater treatment described in the present invention, the three filter element holders are symmetrically provided with limiting grooves on the left and right sides of the bottom of the bottom plate, and the first rotating drum, the second rotating drum and the left and right sides of the top of the rotating column are coaxially installed with clamping plates, and the clamping plates form a gap fit with the limiting grooves of the corresponding turntable levels, and the three groups of filter element holders are respectively clamped on the first rotating drum, the second rotating drum and the clamping plates of the rotating column through the limiting grooves of their bottom plates.

[0017] As a preferred solution of the multiple filtering device for wastewater treatment of the present invention, first balls are rollingly mounted on the upper and lower surfaces of the water wheel, and the water wheel is rotatably connected to the inner wall of the flow channel through the first balls.

[0018] As a preferred embodiment of the multiple filtration device for wastewater treatment described in the present invention, the bottom ends of the first turntable, the second turntable and the third turntable are all provided with second balls, and the bottom end of the third turntable is rotatably connected to the inner bottom wall of the mounting cavity through the second balls, the bottom end of the second turntable is rotatably connected to the third turntable through the second balls, the bottom end of the first turntable is rotatably connected to the second turntable through the second balls, and the bottom end of the rotating column is rotatably connected to the inner bottom wall of the filter box through a bearing.

[0019] As a preferred embodiment of the multiple filtration device for wastewater treatment described in the present invention, first brushes are symmetrically installed on the left and right sides inside the filter tank, and the cleaning surfaces of the two groups of the first brushes are in close contact with the outer surface of the ultra-fine filter element, second brushes are fixedly installed on the opposite surfaces of the two vertical plates of the outermost filter element holder, and the cleaning surfaces of the two second brushes are in close contact with the outer surface of the fine filter element, and third brushes are fixedly installed on the opposite surfaces of the two vertical plates of the filter element holder in the middle layer, and the cleaning surfaces of the two third brushes are in close contact with the outer surface of the primary filter element.

[0020] As a preferred embodiment of the multi-filtration device for wastewater treatment of the present invention, the top end of the driving shaft penetrates the inner top wall of the flow channel and extends to the outside of the filter box.

[0021] Beneficial effects of the present invention:

[0022] (1) The present invention adopts a continuous, hierarchical multi-stage filtration structure, which enables wastewater to undergo primary, fine and ultrafine filtration in a single device in sequence, ensuring that large particles, medium particles and tiny particles can be fully purified, thereby greatly improving wastewater treatment efficiency and filtration accuracy. This structure allows wastewater to enter the inlet through coarse filtration to remove large particle impurities, then pass through the intermediate filter to further intercept medium particles, and finally pass through fine filtration to achieve thorough purification of water quality and meet strict environmental emission requirements.

[0023] (2) The present invention utilizes the kinetic energy generated by the water flow itself to achieve continuous rotation of filter units at all levels through a water wheel-driven precision transmission system. Compared with the traditional method of relying on frequent start and stop of servo motors, this design significantly reduces energy consumption and reduces the adverse effects of mechanical start and stop on equipment life. At the same time, the filter element is in constant contact with the fixed brush during rotation, thereby automatically removing attached impurities, avoiding the occurrence of clogging, and ensuring the stability and efficiency of the device during long-term continuous operation.

[0024] (3) The present invention also optimizes the removal, replacement and maintenance operations of the filter element through modular design, making maintenance work more convenient and efficient. The filter element unit in the device adopts a detachable structure, which is convenient for quickly replacing or upgrading the filter medium when necessary. At the same time, it is equipped with an auxiliary drive device to ensure that the system can still operate normally under low flow conditions. Overall, the present invention not only has significant advantages in improving purification effects, reducing energy consumption and extending equipment life, but also greatly improves maintenance efficiency, providing an efficient, reliable and economical technical solution for actual wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0026] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0027] Figure 2 It is a three-dimensional front cross-sectional view of the present invention;

[0028] Figure 3 It is a three-dimensional top sectional view of the present invention;

[0029] Figure 4 It is a three-dimensional enlarged view of the power mechanism of the present invention;

[0030] Figure 5 It is a three-dimensional exploded view of three turntables of the present invention;

[0031] Figure 6 It is a three-dimensional exploded view of the filter element holder and the filter element of the present invention;

[0032] Figure 7 It is an enlarged front cross-sectional schematic diagram of the connection between the filter mechanism and the filter tank of the present invention;

[0033] Figure 8 For the present invention Figure 2 A schematic diagram of the enlarged structure at point A in the middle. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0037] Example 1

[0038] Reference Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 8 , which is the first embodiment of the present invention, and provides a multiple filtering device for wastewater treatment, whose overall structure includes a filter box 100, a water injection port 101 is opened on the left side of the top of the filter box 100, the bottom end of the water injection port 101 is connected with a flow channel 102, the output end of the flow channel 102 is connected with a retractable hose-type drain pipe 103, a filter tank 104 is opened on the right side of the top of the filter box 100, and an installation cavity 105 is opened at the bottom of the filter box 100 to fix the power mechanism and other transmission components. In this embodiment, the filtering mechanism 200 of the device is arranged inside the filter tank 104, and is composed of three coaxially rotatably connected filter element holders 201 that are arranged equidistantly with gradually increasing diameters from the inside to the outside, wherein a primary filter element 202 is fixedly installed on the outer surface of the innermost filter element holder 201 for initially intercepting large particles of impurities; a fine filter element 203 is fixedly installed on the outer surface of the middle layer filter element holder 201 for intercepting medium particles; an ultrafine filter element 204 is fixedly installed on the outer surface of the outermost filter element holder 201 for final precision filtration, forming a multi-stage filtering structure with gradually increasing filtering accuracy from the inside to the outside. Each filter element holder 201 includes a base plate 201a, and vertical plates 201b are symmetrically installed on the left and right sides of the top of the base plate 201a. A clamping block 201c is fixedly installed on the top of the vertical plate 201b, and a fixing ring 201d is clamped on the top of the clamping block 201c, so that the cylindrical outer wall of each filter element is tightly fitted with the outer side wall of the corresponding vertical plate 201b, the bottom end of the filter element is firmly clamped on the surface of the base plate 201a, and the top end is axially fixed by an interference fit through the fixing ring 201d.

[0039] During operation, sewage first enters the flow channel 102 through the water inlet 101. When passing through the intersection, the water wheel 301 arranged at the position is driven to rotate due to the impact of the water flow. At the same time, the first ball 301a is installed on the upper and lower surfaces of the water wheel 301 in a rolling manner, so that the friction between the water wheel 301 and the inner wall of the flow channel 102 is greatly reduced, so that a larger rotation force is generated when the water flow impacts. The sewage is discharged from the drain pipe 103 into the center of the filter tank 104 and falls, and first enters the primary filter element 202 and the final filter element 204. The first filter barrel formed by the inner filter cartridge holder 201 is used for initial filtration to filter out large particles of impurities. Then, the sewage passes through the filter holes of the primary filter cartridge 202 and enters the second filter barrel formed by the fine filter cartridge 203 and the filter cartridge holder 201 for secondary filtration to remove medium particles of impurities. Finally, the sewage enters the third filter barrel formed by the ultrafine filter cartridge 204 and the filter cartridge holder 201 to complete the final filtration. After the filtration, the water source is discharged from the drain port 106 at the bottom of the filter tank 104, thereby realizing the graded purification of the sewage.

[0040] Example 2

[0041] Reference Figure 2 , Figure 4 and Figure 7 , which is the second embodiment of the present invention, introduces a complete power mechanism 300 and a transmission system on the basis of embodiment 1 to achieve the continuous rotation and self-cleaning function of the filter element holder.

[0042] Specifically, the water wheel 301 arranged at the intersection of the water inlet 101 and the flow channel 102 utilizes the impact of water flow to generate rotational force, and the upper and lower surfaces thereof are equipped with first balls 301a, which can effectively reduce the friction resistance between the water wheel and the inner wall of the flow channel, and ensure that the water wheel generates a large and stable rotational force under the impact of water flow; the center of the water wheel 301 is fixedly connected to a drive shaft 302, the bottom end of which extends into the installation cavity 105 and is fixedly connected to the driving gear 303, and the top end of the drive shaft 302 extends through the inner top wall of the flow channel 102 to the outside of the filter box 100, so as to facilitate the external drive motor to assist the drive when the impact of water flow is insufficient.

[0043] The right side of the driving gear 303 transmits power to the first transmission shaft 304a, the second transmission shaft 304b and the third transmission shaft 304c in sequence through the transmission component 304, wherein a middle driven gear 304d is fixed at the center of the outer surface of the first transmission shaft 304a, the left end of which is meshed with the driving gear 303 and the right end is meshed with the second rotating disk 306; the upper ends of the second transmission shaft 304b and the third transmission shaft 304c are respectively installed with the first upper driven gear 304e and the second upper driven gear 304f, and the lower ends are respectively installed with the first lower driven gear 30 4g and the second lower driven gear 304h, wherein the left sides of the first upper driven gear 304e and the first lower driven gear 304g are meshed with the driving gear 303, and the right sides are meshed with the second upper driven gear 304f and the second lower driven gear 304h respectively, and the right side of the second upper driven gear 304f is meshed with the first turntable 305, and the right side of the second lower driven gear 304h is meshed with the third turntable 307; at the same time, the driving gear 303 can also drive the middle driven gear 304d to rotate in the reverse direction, so that the second turntable 306 rotates forward.

[0044] The power transmission assembly 308 is composed of a first rotating cylinder 308a fixedly installed at the top center of the first rotating disk 305, a second rotating cylinder 308b installed at the top center of the second rotating disk 306, and a rotating column 308c installed at the top center of the third rotating disk 307, wherein the centers of the first rotating cylinder 308a and the second rotating cylinder 308b are both hollow structures, the top end of the first rotating cylinder 308a passes through the installation cavity 105 and extends into the filter tank 104, the top end of the second rotating cylinder 308b passes through the first rotating cylinder 308a and is coaxially sleeved, and its top end extends into the filter tank 104 and is higher than the first rotating cylinder 308a; the rotating column 308c passes through the second rotating cylinder 308b and is coaxially sleeved, and its top end extends into the filter tank 104 and is higher than the second rotating cylinder 308b. Through the transmission system, the first turntable 305 and the third turntable 307 realize reverse rotation, while the second turntable 306 rotates forward, so that the innermost and outermost filter element holders 201 driven by the first rotating drum 308a, the rotating column 308c and the card plate 308d rotate in the reverse direction, driving the primary filter element 202 and the ultrafine filter element 204 to rotate in the reverse direction; at the same time, the middle filter element holder 201 and the fine filter element 203 are driven to rotate forward through the second rotating drum 308b and the card plate 308d. This structural design enables the first brush 107, the second brush 108 and the third brush 109 arranged on the inner wall of the filter tank 104 to clean the ultra-fine filter element 204, the fine filter element 203 and the primary filter element 202 respectively (only when the middle filter element holder 201 rotates in the opposite direction to the outer and inner filter element holders 201 can the second brush 108 and the third brush 109 effectively clean the surface of the fine filter element 203 and the primary filter element 202 respectively), thereby realizing the self-cleaning function of the filter element, effectively preventing impurities from adhering to and clogging the filter element, and ensuring the continuous and efficient wastewater treatment process.

[0045] Example 3

[0046] Reference Figure 2 to Figure 7 , which is the third embodiment of the present invention. This embodiment further improves the design of filter element removal, replacement and equipment stability on the basis of embodiments 1 and 2, and provides a more detailed supplementary explanation of the functions of each component.

[0047] Specifically, limit grooves 201a1 are provided on the left and right sides of the bottom of the bottom plate 201a of each filter element holder 201, which form a clearance fit with the first rotating cylinder 308a, the second rotating cylinder 308b and the card plate 308d coaxially installed on the top of the rotating column 308c, so that the filter element holder 201 can be firmly clamped on the corresponding transmission component; when the filter element needs to be removed, the staff only needs to retract the drain pipe 103 to the left side, and pull out the three filter element holders 201 from the inside to the outside in turn, and the primary filter element 202, the fine filter element 203 and the ultra-fine filter element 204 can be taken out from the filter tank 104, and then the fixing ring 201d on each holder can be removed to remove the filter element and replace it. After the replacement is completed, it can be installed in reverse order to resume normal operation.

[0048] At the same time, in order to ensure the smooth operation of the transmission system, the bottom ends of the first turntable 305, the second turntable 306 and the third turntable 307 are each provided with a second ball 309, wherein the bottom end of the third turntable 307 is rotatably connected to the bottom wall of the mounting cavity 105 through the second ball 309, and the second turntable 306 and the third turntable 307 as well as the first turntable 305 and the second turntable 306 are also limitedly supported by the second ball 309, which not only reduces the friction but also ensures the stability of the rotation.

[0049] It is also explained that the top end of the drive shaft 302 is arranged outside the top end of the filter box 100, which is convenient for an external drive motor to ensure that the filter element holder 201 can still be driven to rotate when the water flow impact is insufficient; at the same time, the drain pipe 103 adopts a retractable structure, and its output end is arranged at the center position above the filter element holder 201, so that the sewage can be preferentially discharged into the innermost primary filter element 202 for initial filtration, thereby ensuring the graded filtration order of the sewage.

[0050] To sum up, in this embodiment, the entire device realizes the whole process of sewage injection, graded filtration, self-cleaning and final discharge, which not only ensures the effective retention of large particles, medium particles and tiny particles by each stage of filter element, but also makes each filter element holder rotate in a predetermined direction through the water wheel and the transmission system, and realizes mutual cleaning with the brush installed on the inner wall of the filter tank 104, thereby preventing the filter element from being blocked, ensuring the efficient, continuous and stable operation of the equipment, and having the advantages of easy disassembly, replacement of filter elements and external auxiliary drive, etc., providing a complete and reliable technical solution for actual wastewater treatment.

[0051] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0052] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0053] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A multiple filtration device for wastewater treatment, characterized in that: include, A filter box (100), wherein a water inlet (101) is provided on the left side of the top of the filter box (100), the bottom end of the water inlet (101) is connected to a flow channel (102), the output end of the flow channel (102) is connected to a drain pipe (103), the right side of the top of the filter box (100) is open and provided with a filter tank (104), and the bottom end of the filter box (100) is provided with a mounting cavity (105); The filtering mechanism (200) comprises three coaxially arranged filter cartridge seats (201) rotatably connected to the inside of the filtering tank (104), wherein the three filter cartridge seats (201) are arranged in sequence and at equal intervals in a manner such that the diameter gradually increases from the inside to the outside; wherein a primary filter cartridge (202) is fixed on the outer surface of the innermost filter cartridge seat (201), a fine filter cartridge (203) is fixed on the outer surface of the middle filter cartridge seat (201), and an ultrafine filter cartridge (204) is fixed on the outer surface of the outermost filter cartridge seat (201), thereby forming a multi-stage filtering structure with gradually increasing filtering accuracy from the inside to the outside; and, The power mechanism (300) comprises a water wheel (301) rotatably connected to the intersection of the water injection port (101) and the flow channel (102); a driving shaft (302) is fixedly connected at the center of the water wheel (301); the bottom end of the driving shaft (302) extends into the installation cavity (105) and is fixedly connected to a driving gear (303); the right side of the driving gear (303) is sequentially connected to a first rotating disk (305), a second rotating disk (306) and a third rotating disk (307) through a transmission component (304); wherein the first rotating disk (305) is located above the second rotating disk (306), and the second rotating disk (306) is located above the third rotating disk (307); a power transmission component (308) is arranged at the center of the first rotating disk (305), the second rotating disk (306) and the third rotating disk (307); and the power transmission component (308) is connected to the three filter cartridge holders (201) in a transmission manner.

2. The multiple filtration device for wastewater treatment according to claim 1, characterized in that: The drainage pipe (103) is a retractable hose, the output end of which extends to the center position above the innermost filter element holder (201), and a drainage port (106) is provided on the right side of the bottom of the filter tank (104).

3. The multiple filtration device for wastewater treatment according to claim 2, characterized in that: The three groups of filter cartridge holders (201) all comprise a bottom plate (201a), vertical plates (201b) are symmetrically mounted on the left and right sides of the top of the bottom plate (201a), a clamping block (201c) is fixedly mounted on the top of the two vertical plates (201b), and a fixing ring (201d) is clamped on the top of the two clamping blocks (201c); The primary filter element (202), fine filter element (203) and ultra-fine filter element (204) are respectively embedded in three groups of filter element holders (201), wherein the cylindrical outer wall of each filter element fits with the outer side walls of the corresponding two vertical plates (201b), the bottom end of the filter element is clamped on the surface of the bottom plate (201a), and the top end is axially fixed by the interference fit of the fixing ring (201d).

4. The multiple filtration device for wastewater treatment according to claim 3, characterized in that: The transmission component (304) includes a first transmission shaft (304a), a second transmission shaft (304b) and a third transmission shaft (304c) which are rotatably connected in the installation cavity (105); a middle driven gear (304d) is fixedly installed at the center of the outer surface of the first transmission shaft (304a); the left end of the middle driven gear (304d) is meshed with the driving gear (303), and the right end is meshed with the second rotating disk (306); the upper ends of the outer surfaces of the second transmission shaft (304b) and the third transmission shaft (304c) are respectively installed with a first upper driven gear (304e) and a second upper driven gear (304f); The lower ends of the outer surfaces of the second transmission shaft (304b) and the third transmission shaft (304c) are respectively mounted with a first lower driven gear (304g) and a second lower driven gear (304h), and the left sides of the first upper driven gear (304e) and the first lower driven gear (304g) are meshed and connected with the driving gear (303), and the right sides are respectively meshed and connected with the second upper driven gear (304f) and the second lower driven gear (304h), the right side of the second upper driven gear (304f) is meshed and connected with the first rotating disk (305), and the right side of the second lower driven gear (304h) is meshed and connected with the third rotating disk (307).

5. The multiple filtration device for wastewater treatment according to claim 4, characterized in that: The power transmission assembly (308) comprises a first rotating drum (308a) fixedly mounted at the top center of the first rotating disk (305), a second rotating drum (308b) mounted at the top center of the second rotating disk (306), and a rotating column (308c) mounted at the top center of the third rotating disk (307); wherein the centers of the first rotating drum (308a) and the second rotating drum (308b) are both hollow, the top of the first rotating drum (308a) passes through the mounting cavity (105) and extends into the filter tank (104), the top of the second rotating drum (308b) passes through the first rotating drum (308a) and is coaxially sleeved, its top extends into the filter tank (104) and is arranged higher than the top of the first rotating drum (308a), and the rotating column (308c) passes through the second rotating drum (308b) and is coaxially sleeved, its top extends into the filter tank (104) and is arranged higher than the top of the second rotating drum (308b).

6. The multiple filtration device for wastewater treatment according to claim 5, characterized in that: The bottom of the bottom plate (201a) of the three filter cartridge holders (201) is provided with limiting grooves (201a1) symmetrically on the left and right sides, and the left and right sides of the top of the first rotating cylinder (308a), the second rotating cylinder (308b) and the rotating column (308c) are coaxially installed with clamping plates (308d) correspondingly, and the clamping plates (308d) and the limiting grooves (201a1) of the corresponding rotating disk level form a clearance fit, and the three groups of filter cartridge holders (201) are respectively clamped on the clamping plates (308d) of the first rotating cylinder (308a), the second rotating cylinder (308b) and the rotating column (308c) through the limiting grooves (201a1) of their bottom plates (201a).

7. The multiple filtration device for wastewater treatment according to claim 6, characterized in that: The upper and lower surfaces of the water wheel (301) are both rollingly mounted with first balls (301a), and the water wheel (301) is rotatably connected to the inner wall of the flow channel (102) via the first balls (301a).

8. The multiple filtration device for wastewater treatment according to claim 7, characterized in that: The bottom ends of the first turntable (305), the second turntable (306) and the third turntable (307) are all provided with second balls (309), and the bottom end of the third turntable (307) is rotatably connected to the inner bottom wall of the mounting cavity (105) via the second balls (309), the bottom end of the second turntable (306) is rotatably connected to the third turntable (307) via the second balls (309), the bottom end of the first turntable (305) is rotatably connected to the second turntable (306) via the second balls (309), and the bottom end of the rotating column (308c) is rotatably connected to the inner bottom wall of the filter box (100) via a bearing.

9. The multiple filtration device for wastewater treatment according to claim 8, characterized in that: First brushes (107) are symmetrically installed on the left and right sides inside the filter tank (104), and the cleaning surfaces of the two groups of the first brushes (107) are in close contact with the outer surface of the ultra-fine filter element (204). Second brushes (108) are fixedly installed on the opposite surfaces of the two vertical plates (201b) of the outermost filter element holder (201), and the cleaning surfaces of the two second brushes (108) are in close contact with the outer surface of the fine filter element (203). Third brushes (109) are fixedly installed on the opposite surfaces of the two vertical plates (201b) of the filter element holder (201) of the middle layer, and the cleaning surfaces of the two third brushes (109) are in close contact with the outer surface of the primary filter element (202).

10. The multiple filtration device for wastewater treatment according to claim 9, characterized in that: The top end of the driving shaft (201) penetrates the inner top wall of the flow channel (102) and extends to the outside of the filter box (100).

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