Multi-stage filter system

Abstract

The invention relates to the technical field of sewage filtration, in particular to a multi-stage filter system which comprises a filter, and the filter comprises a first-stage filter box with an opening in the top and a closed second-stage filter box. Through the arrangement of a blow-off pipe and a communicating pipe, when the height of the liquid level in the primary filter box is completely higher than that of the blow-off pipe, liquid is discharged outwards through the blow-off pipe at the moment, a siphoning effect is generated under the action of atmospheric pressure, and the liquid in the primary filter box can perform back-flushing cleaning on a primary filter plate; when the height of the liquid level in the primary filter box is lower than the highest position of the communicating pipe, the liquid in the secondary filter box reversely enters the primary filter box through the communicating pipe under the siphon action, and at the moment, the liquid in the secondary filter box backflushes the secondary filter plate into the communicating pipe and enters the primary filter box through the communicating pipe; the backwashing effect on the first-stage filter plate and the second-stage filter plate is realized, the filtering efficiency is improved, and the maintenance cost is also reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sewage filtration, and in particular to a multi-stage filter system. Background Art

[0002] With the acceleration of industrial production and urbanization, water pollution is becoming increasingly serious, and various types of water treatment equipment have been widely used. As a key component of the water treatment system, the performance of the filter directly affects the final water quality and the operating stability of the system; traditional filters usually use a single-stage filtration method to intercept impurities in the water through a filter or filter element; however, as the filtration time increases, more and more impurities accumulate on the filter, which can easily lead to a decrease in filtration efficiency or even filter clogging.

[0003] The patent with application number CN201510518602.0 discloses a sewage multi-stage filtration tank, including a cylindrical tank body, the cylindrical tank body is open at the top, a water outlet is arranged at the bottom, and a filter element is arranged in the tank body, the filter element includes an annular support body connected to the upper inner wall of the tank body, a circular filter screen fixed on the annular support body, and a first inverted conical filter screen and a second inverted conical filter screen whose bottom is fixed to the annular support body, and the bottom surface area of ​​the first inverted conical filter screen and the bottom surface area of ​​the second inverted conical filter screen are the same as the area of ​​the plane where the annular support body is located.

[0004] However, when the above patent is in use, as the filtering time increases, more and more impurities accumulate on the filter, which can easily lead to a decrease in filtering efficiency or even filter clogging, and it is inconvenient to clean and maintain the filter, resulting in a decrease in filtering efficiency or even filter clogging. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a multi-stage filter system to solve the problem that it is inconvenient to clean and maintain the filter screen of the existing filter.

[0006] Based on the above purpose, the present invention provides a multi-stage filter system, including a filter, wherein the filter includes a primary filter box with an opening at the top and a sealed secondary filter box, a primary filter plate is arranged in the primary filter box, a secondary filter plate is arranged in the secondary filter box, the primary filter box and the secondary filter box are connected to each other through a connecting pipe, and the two ends of the connecting pipe are respectively located on the upper side of the primary filter plate and the secondary filter plate;

[0007] Wherein, the front side of the first-level filter box is connected with a water inlet pipe, and the water outlet end of the water inlet pipe is located at the lower side of the first-level filter plate; the left side of the first-level filter box is connected with a sewage pipe, and a second solenoid valve is provided on the sewage pipe. The water inlet end of the sewage pipe is located at the bottom of the first-level filter plate, and the water outlet end of the sewage pipe is connected to the external sewage treatment system. The flow rate of the sewage pipe is greater than the flow rate of the water inlet pipe, and the highest point of the sewage pipe is higher than the connecting pipe and lower than the top of the first-level filter box;

[0008] An exhaust valve is arranged on the top of the secondary filter box, and a water outlet pipe is connected to the right side of the secondary filter box, and a first solenoid valve and a flow valve are arranged on the water outlet pipe.

[0009] Furthermore, a first contact sensor for opening and closing the first electromagnetic valve is disposed on the top of the inner cavity of the secondary filter box, and a first floating block corresponding to the first contact sensor is slidably disposed on the right side of the inner cavity of the secondary filter box;

[0010] A second contact sensor for opening and closing the second solenoid valve is provided on the right side of the inner cavity of the first-level filter box, and the second contact sensor is arranged on the upper side of the highest point of the sewage pipe. A second floating block corresponding to the second contact sensor is slidably provided on the right side of the inner cavity of the first-level filter box, and the second floating block is located on the upper side of the first-level filter plate; a third contact sensor for opening and closing the second solenoid valve is also provided on the right side of the inner cavity of the first-level filter box, and the third contact sensor is arranged on the lower side of the water inlet end of the sewage pipe. A third floating block corresponding to the third contact sensor is slidably provided on the right side of the inner cavity of the first-level filter box, and the third floating block is located on the lower side of the first-level filter plate.

[0011] Furthermore, the end of the connecting pipe located in the primary filter box is connected to a flushing component, and the flushing component is used to increase the flushing area of ​​the primary filter plate.

[0012] Furthermore, the flushing assembly includes a sleeve, which is sleeved on the end of the connecting pipe and connected to the connecting pipe, and at least four groups of spray pipes are equidistantly arranged on the outer circumference of the sleeve; wherein the spray pipe is connected to the sleeve, and six groups of spray holes are equidistantly opened at the bottom of the spray pipe, and the spray holes are connected to the spray pipe.

[0013] Furthermore, the end of the connecting pipe located in the secondary filter box is connected to a vertical pipe with an opening at the bottom, a stirring rod is rotatably arranged in the vertical pipe, and the top of the stirring rod is rotatably connected to the top of the inner cavity of the secondary filter box; a driving motor for driving the stirring rod to rotate is arranged on the top of the secondary filter box; the driving motor drives the stirring rod to rotate to generate a vortex in the secondary filter box, so as to gather the dirt backwashed from the secondary filter plate in the middle and the bottom opening of the vertical pipe.

[0014] Furthermore, a cleaning rod for scraping off dirt is provided at the bottom of the stirring rod.

[0015] Furthermore, a paddle is fixedly sleeved on the stirring rod.

[0016] Furthermore, the stirring rod includes an upper driving rod, a lower driving rod and a differential. The top of the upper driving rod is rotatably connected to the top of the inner cavity of the secondary filter box. The driving motor is used to drive the upper driving rod to rotate, and the paddle fixed sleeve is arranged on the outer periphery of the upper driving rod; a differential is arranged at the bottom of the upper driving rod, and the differential is fixedly arranged at the top of the vertical pipe. A lower driving rod is arranged at the bottom of the differential. The differential is used to transmit the upper driving rod and the lower driving rod and make the rotation speed of the lower driving rod smaller than that of the upper driving rod; the bottom end of the lower driving rod is connected to the top of the cleaning rod.

[0017] Furthermore, the differential includes a shell, which is fixedly arranged on the top of the vertical tube, the top of the shell is rotatably connected to the upper drive rod, and the bottom of the shell is rotatably connected to the lower drive rod; a gear ring is fixedly connected to the inner periphery of the shell, a central gear is fixedly connected to the bottom of the upper drive rod, at least one group of satellite gears is arranged between the central gear and the gear ring, and the satellite gears are respectively meshed with the gear ring and the central gear; a turntable is fixedly arranged on the top of the lower drive rod, and the bottom of the turntable overlaps with the bottom of the inner cavity of the shell; a connecting rod is rotatably arranged at the bottom center of the satellite gear, and the other end of the connecting rod is rotatably connected to the top of the turntable.

[0018] Beneficial effects of the present invention: It can be seen from the above that a multi-stage filter system provided by the present invention, through the set sewage pipe and connecting pipe, when the liquid level in the first-stage filter box is completely higher than the sewage pipe, the liquid is discharged outward through the sewage pipe, and a siphon effect is generated under the action of atmospheric pressure, and the liquid in the first-stage filter box will backwash the first-stage filter plate; when the liquid level in the first-stage filter box is lower than the highest point of the connecting pipe, the liquid in the second-stage filter box also reversely enters the first-stage filter box through the connecting pipe under the siphon effect, and at this time the liquid in the second-stage filter box backwashes the second-stage filter plate into the connecting pipe, and enters the first-stage filter box through the connecting pipe; the backwashing effect on the first-stage filter plate and the second-stage filter plate is achieved, which not only improves the filtration efficiency, but also reduces the maintenance cost, ensuring the long-term stable operation of the filtration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the main cross-sectional structure of an embodiment of the present invention;

[0021] Figure 2 For the embodiment of the present invention Figure 1 A is a schematic diagram of the enlarged structure of the middle part;

[0022] Figure 3 For the embodiment of the present invention Figure 1 A schematic diagram of the enlarged structure of B;

[0023] Figure 4 A schematic diagram of a first-view stereoscopic structure of an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of a second viewing angle stereoscopic structure of an embodiment of the present invention;

[0025] Figure 6 is a schematic diagram of a partial cross-sectional structure at a second viewing angle of an embodiment of the present invention;

[0026] Figure 7 is a schematic diagram of a front cross-sectional structure of the differential according to an embodiment of the present invention;

[0027] Figure 8 It is a schematic diagram of a top-down cross-sectional structure of the differential according to an embodiment of the present invention.

[0028] The markings in the figure are:

[0029] 1. Primary filter box; 101. Primary filter plate; 2. Secondary filter box; 201. Secondary filter plate; 202. Exhaust valve; 3. Water inlet pipe; 4. Water outlet pipe; 401. First solenoid valve; 402. Flow valve; 5. Connecting pipe; 6. Flushing assembly; 601. Casing; 602. Spray pipe; 7. Vertical pipe; 8. Upper drive rod; 9. Differential; 901. Housing; 902. Gear ring; 903. Center gear; 904. Satellite gear; 905. Connecting rod; 906. Turntable; 10. Lower drive rod; 11. Cleaning rod; 12. Paddle; 13. Drive motor; 14. First floating block; 15. First contact sensor; 16. Drain pipe; 1601. Second solenoid valve; 17. Second contact sensor; 18. Second floating block; 19. Third contact sensor; 20. Third floating block. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0031] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, a multi-stage filter system includes a filter, the filter includes a primary filter box 1 with an opening at the top and a closed secondary filter box 2, a primary filter plate 101 is arranged in the primary filter box 1, a secondary filter plate 201 is arranged in the secondary filter box 2, the inner cavities of the primary filter box 1 and the secondary filter box 2 are connected by a connecting pipe 5, and the two ends of the connecting pipe 5 are respectively located on the upper sides of the primary filter plate 101 and the secondary filter plate 201;

[0033] Among them, the front side of the primary filter box 1 is connected with an inlet pipe 3, and the water outlet end of the inlet pipe 3 is located at the lower side of the primary filter plate 101; the left side of the primary filter box 1 is connected with a drain pipe 16, and a second solenoid valve 1601 is provided on the drain pipe 16. The water inlet end of the drain pipe 16 is located at the bottom of the primary filter plate 101, and the water outlet end of the drain pipe 16 is connected to the external sewage treatment system. The flow rate of the drain pipe 16 is greater than the flow rate of the inlet pipe 3, and the highest point of the drain pipe 16 is higher than the connecting pipe 5 and lower than the top of the primary filter box 1;

[0034] An exhaust valve 202 is provided on the top of the secondary filter box 2. The right side of the secondary filter box 2 is connected to a water outlet pipe 4, which is located at the lower side of the secondary filter plate 201. The water outlet pipe 4 is provided with a first solenoid valve 401 and a flow valve 402.

[0035] In this embodiment, when in use, the flow valve 402 is adjusted to make the flow of the water outlet pipe 4 smaller than the flow of the connecting pipe 5; then, the first solenoid valve 401 and the second solenoid valve 1601 are closed, and the liquid enters the primary filter box 1 from bottom to top through the water inlet pipe 3, and the primary filter plate 101 filters the liquid, and the filtered impurities are accumulated at the bottom of the primary filter plate 101; when the liquid level in the primary filter box 1 is completely higher than the connecting pipe 5, the liquid filtered by the primary filter plate 101 enters the secondary filter box 2 through the connecting pipe 5 until the secondary filter box 2 is filled, and the filtering preparation work is completed;

[0036] After the preparation is completed, the solenoid valve is controlled to start, and the liquid filtered by the secondary filter plate 201 is discharged through the outlet pipe 4 to start the filtering operation;

[0037] As the filtering operation continues, since the flow rate of the outlet pipe 4 is less than the flow rate of the connecting pipe 5, the drainage pipe continuously transports liquid to the primary filter box 1, and the liquid level in the primary filter box 1 continues to rise until the liquid level is at the highest point of the sewage pipe 16. The liquid gradually flows into the sewage pipe 16 and gradually fills the sewage pipe 16 until the liquid level in the primary filter box 1 is completely higher than the sewage pipe 16, completing the preparation for backwashing;

[0038] After that, the second solenoid valve 1601 is opened to start the backwashing operation, and the liquid is discharged outward through the drain pipe 16, and a siphon effect is generated under the action of atmospheric pressure. The atmospheric pressure continuously presses the liquid in the primary filter box 1 outward through the drain pipe 16. Since the flow rate of the drain pipe 16 is greater than the flow rate of the water inlet pipe 3, the liquid level of the primary filter box 1 will continue to drop at this time, and the liquid in the primary filter box 1 will flow from top to bottom to the water inlet pipe 3 of the drain pipe 16, thereby continuously flushing the primary filter plate 101, flushing the dirt accumulated on the lower side of the primary filter plate 101 and discharging it outward through the drain pipe 16;

[0039] Furthermore, during the backwashing operation, when the liquid level in the primary filter box 1 is lower than the highest point of the connecting pipe 5, the first solenoid valve 401 is closed, and the liquid in the secondary filter box 2 also reversely enters the primary filter box 1 through the connecting pipe 5 under the siphon effect. At this time, the liquid in the secondary filter box 2 flows from bottom to top and flushes the dirt accumulated on the top of the secondary filter plate 201 into the connecting pipe 5, and enters the primary filter box 1 through the connecting pipe 5; the dirt filtered out by the secondary filter plate 201 can pass through the primary filter plate 101, and will not cause the primary filter plate 101 to be blocked; in addition, as the liquid level in the primary filter box 1 continues to drop to the lower side of the primary filter plate 101, the water discharged through the connecting pipe 5 will directly flush to the surface of the primary filter plate 101, thereby further improving the flushing effect on the primary filter plate 101;

[0040] When the liquid level in the primary filter box 1 is lower than the water inlet end of the drain pipe 16, air enters the drain pipe 16 and the siphon phenomenon is destroyed. At this time, the backwashing operation is completed, and the second solenoid valve 1601 is closed again, and the above-mentioned filtration operation is repeated, so that the filtration operation and the backwashing operation are performed alternately, and the siphon phenomenon is used to realize the backwashing of the primary filter plate 101 and the secondary filter plate 201 to avoid blockage of the primary filter plate 101 and the secondary filter plate 201, thereby ensuring the overall water filtration efficiency of the device.

[0041] Preferably, a first contact sensor 15 for opening and closing the first solenoid valve 401 is provided at the top of the inner cavity of the secondary filter box 2, and a first floating block 14 corresponding to the first contact sensor 15 is slidably provided on the right side of the inner cavity of the secondary filter box 2;

[0042] A second contact sensor 17 for opening and closing the second solenoid valve 1601 is provided on the right side of the inner cavity of the first-stage filter box 1. The second contact sensor 17 is provided on the upper side of the highest point of the sewage pipe 16. A second floating block 18 corresponding to the second contact sensor 17 is slidably provided on the right side of the inner cavity of the first-stage filter box 1. The second floating block 18 is located on the upper side of the first-stage filter plate 101; a third contact sensor 19 for opening and closing the second solenoid valve 1601 is also provided on the right side of the inner cavity of the first-stage filter box 1. The third contact sensor 19 is provided on the lower side of the water inlet end of the sewage pipe 16. A third floating block 20 corresponding to the third contact sensor 19 is slidably provided on the right side of the inner cavity of the first-stage filter box 1. The third floating block 20 is located on the lower side of the first-stage filter plate 101;

[0043] The liquid enters the primary filter box 1 from bottom to top through the water inlet pipe 3, and the primary filter plate 101 filters the liquid, and the filtered impurities are accumulated at the bottom of the primary filter plate 101; when the liquid level in the primary filter box 1 is completely higher than the connecting pipe 5, the liquid filtered by the primary filter plate 101 enters the secondary filter box 2 through the connecting pipe 5 until the secondary filter box 2 is filled; at this time, the first floating block 14 floats up under the influence of buoyancy and contacts the first contact sensor 15, and the first contact sensor 15 sends an electrical signal to the first solenoid valve 401 through the external control unit, so that the first solenoid valve 401 is opened, and then the liquid filtered by the secondary filter plate 201 for the second time is discharged to the next level water treatment unit through the water outlet pipe 4, and the filtering operation starts;

[0044] As the filtering operation continues, since the flow rate of the outlet pipe 4 is less than the flow rate of the connecting pipe 5, the drain pipe continuously transports liquid to the primary filter box 1, and the liquid level in the primary filter box 1 will continue to rise until the liquid level is at the highest point of the sewage pipe 16. The liquid gradually flows into the sewage pipe 16 and gradually fills the sewage pipe 16 until the liquid level in the primary filter box 1 is completely higher than the sewage pipe 16; at this time, the second floating block 18 floats up to contact with the second contact sensor 17, and the second contact sensor 17 sends an electrical signal to the second solenoid valve 1601 through the external control unit, so that the second solenoid valve 1601 is opened, and the liquid is discharged to the outside through the sewage pipe 16 for backwashing operation;

[0045] During the backwashing operation, when the liquid level in the primary filter box 1 is lower than the highest point of the connecting pipe 5, the liquid in the secondary filter box 2 is discharged into the primary filter box 1, and the liquid level in the secondary filter box 2 drops. At this time, the first floating block 14 is separated from the first contact sensor 15, and the first contact sensor 15 sends an electrical signal to the first solenoid valve 401 through the external control unit, so that the first solenoid valve 401 is closed, preventing the liquid in the secondary filter box 2 from being discharged outward through the outlet pipe 4, so that the liquid in the secondary filter box 2 always flows from bottom to top to flush the secondary filter plate 201;

[0046] When the liquid level in the primary filter box 1 is lower than the water inlet end of the sewage pipe 16, air enters the sewage pipe 16, the siphon phenomenon is destroyed, and the backwashing operation is completed. At this time, the third float 20 contacts the third contact sensor 19, and the third contact sensor 19 sends an electrical signal to the second solenoid valve 1601 through the external control unit to close the second solenoid valve 1601, thereby realizing the automation and switching of the filtering operation and the backwashing operation.

[0047] Preferably, the end of the connecting pipe 5 located in the primary filter box 1 is connected to a flushing assembly 6, and the flushing assembly 6 is used to increase the flushing area of ​​the primary filter plate 101;

[0048] The flushing assembly 6 includes a sleeve 601, which is sleeved on the end of the connecting pipe 5 and connected to the connecting pipe 5. At least four groups of spray pipes 602 are equidistantly arranged on the outer circumference of the sleeve 601; wherein the spray pipe 602 is connected to the sleeve 601, and six groups of spray holes are equidistantly opened at the bottom of the spray pipe 602, and the spray holes are connected to the spray pipe 602;

[0049] When the liquid level in the primary filter box 1 is completely higher than the connecting pipe 5, the liquid filtered by the primary filter plate 101 enters the connecting pipe 5 through the spray hole, the spray pipe 602, and the sleeve 601 and enters the secondary filter box 2 until the secondary filter box 2 is filled; when the liquid level in the primary filter box 1 is lower than the highest point of the connecting pipe 5, the liquid in the secondary filter box 2 is also siphoned through the connecting pipe 5 in the reverse direction through the sleeve 601, the spray pipe 602 and the spray hole to flush the primary filter plate 101; the spray pipe 602 is set to increase the flushing area of ​​the primary filter plate 101, and further improve the flushing effect of the primary filter plate 101.

[0050] Preferably, the end of the connecting pipe 5 located in the secondary filter box 2 is connected to a vertical pipe 7 with a bottom opening, a stirring rod is rotatably arranged in the vertical pipe 7, and the top of the stirring rod is rotatably connected to the top of the inner cavity of the secondary filter box 2; a driving motor 13 for driving the stirring rod to rotate is arranged on the top of the secondary filter box 2; the driving motor 13 drives the stirring rod to rotate so as to generate a vortex in the secondary filter box 2, so as to gather the dirt backwashed from the secondary filter plate 201 in the middle and at the bottom opening of the vertical pipe 7;

[0051] A cleaning rod 11 for scraping off dirt is provided at the bottom of the stirring rod;

[0052] A paddle 12 is fixedly mounted on the stirring rod;

[0053] The stirring rod includes an upper driving rod 8, a lower driving rod 10 and a differential 9. The top of the upper driving rod 8 is rotatably connected to the top of the inner cavity of the secondary filter box 2. The driving motor 13 is used to drive the upper driving rod 8 to rotate. The paddle 12 is fixedly sleeved on the outer periphery of the upper driving rod 8. The bottom of the upper driving rod 8 is provided with a differential 9, which is fixedly arranged on the top of the vertical pipe 7. The bottom of the differential 9 is provided with a lower driving rod 10. The differential 9 is used to transmit the upper driving rod 8 and the lower driving rod 10 and make the rotation speed of the lower driving rod 10 lower than that of the upper driving rod 8. The bottom end of the lower driving rod 10 is connected to the top of the cleaning rod 11, and the lower driving rod 10 is rotatably connected to the vertical pipe 7.

[0054] The differential 9 includes a housing 901, which is fixedly arranged on the top of the vertical tube 7, the top of the housing 901 is rotatably connected to the upper drive rod 8, and the bottom of the housing 901 is rotatably connected to the lower drive rod 10; a gear ring 902 is fixedly connected to the inner periphery of the housing 901, a central gear 903 is fixedly connected to the bottom of the upper drive rod 8, at least one set of satellite gears 904 is arranged between the central gear 903 and the gear ring 902, and the satellite gears 904 are respectively meshed with the gear ring 902 and the central gear 903; a turntable 906 is fixedly arranged on the top of the lower drive rod 10, and the bottom of the turntable 906 overlaps with the bottom of the inner cavity of the housing 901; a connecting rod 905 is rotatably arranged at the bottom center of the satellite gear 904, and the other end of the connecting rod 905 is rotatably connected to the top of the turntable 906;

[0055] In this embodiment, when the backwashing operation is working, the first floating block 14 is separated from the first contact sensor 15, and the first contact sensor 15 sends a working signal to the drive motor 13 through the external control unit to drive the upper drive rod 8 to rotate. The upper drive rod 8 drives the cleaning rod 11 to rotate through the differential 9 and the lower drive rod 10 to scrape off the dirt remaining on the secondary filter plate 201, and the upper drive rod 8 drives the paddle 12 to rotate to stir the liquid to form a vortex, which can gather the dirt backwashed from the secondary filter plate 201 and the cleaning rod 11 at the center to reduce the outward diffusion of the dirt. The gathered dirt can enter the primary filter box 1 in the reverse direction through the connecting pipe 5, and the dirt in the secondary filter box 2 is discharged outward to the maximum extent, so as to avoid the dirt from accumulating on the secondary filter plate 201 again, thereby improving the backwashing effect; when the first floating block 14 contacts the first contact sensor 15, the first contact sensor 15 sends an electrical signal to the drive motor 13 through the external control unit to turn off the drive motor 13;

[0056] Furthermore, through the differential 9, the upper drive rod 8 drives the central gear 903 to rotate, the central gear 903 drives the planetary gears to revolve, and the planetary gears drive the turntable 906 to rotate through the connecting rod 905, thereby driving the lower drive rod 10 to rotate, so that the rotation speed of the lower drive rod 10 can be lower than that of the upper drive rod 8, thereby preventing the cleaning rod 11 from rotating too fast and damaging the secondary filter plate 201.

[0057] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0058] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-stage filter system, comprising a filter, characterized in that: The filter comprises a primary filter box (1) with an opening at the top and a sealed secondary filter box (2); a primary filter plate (101) is arranged in the primary filter box (1), a secondary filter plate (201) is arranged in the secondary filter box (2); the inner cavities of the primary filter box (1) and the secondary filter box (2) are connected by a connecting pipe (5); the two ends of the connecting pipe (5) are respectively located on the upper side of the primary filter plate (101) and the secondary filter plate (201); The front side of the primary filter box (1) is connected to a water inlet pipe (3), and the water outlet end of the water inlet pipe (3) is located at the lower side of the primary filter plate (101); the left side of the primary filter box (1) is connected to a sewage pipe (16), and a second solenoid valve (1601) is provided on the sewage pipe (16); the water inlet end of the sewage pipe (16) is located at the bottom of the primary filter plate (101), and the water outlet end of the sewage pipe (16) is connected to an external sewage treatment system; the flow rate of the sewage pipe (16) is greater than the flow rate of the water inlet pipe (3), and the highest point of the sewage pipe (16) is higher than the connecting pipe (5) and lower than the top of the primary filter box (1); An exhaust valve (202) is provided on the top of the secondary filter box (2), and a water outlet pipe (4) is connected to the right side of the secondary filter box (2), and a first solenoid valve (401) and a flow valve (402) are provided on the water outlet pipe (4).

2. The multi-stage filter system according to claim 1, characterized in that: A first contact sensor (15) for opening and closing the first electromagnetic valve (401) is arranged at the top of the inner cavity of the secondary filter box (2), and a first floating block (14) corresponding to the first contact sensor (15) is slidably arranged on the right side surface of the inner cavity of the secondary filter box (2); A second contact sensor (17) for opening and closing the second electromagnetic valve (1601) is arranged on the right side of the inner cavity of the primary filter box (1), and the second contact sensor (17) is arranged on the upper side of the highest point of the sewage pipe (16). A second floating block (18) corresponding to the second contact sensor (17) is slidably arranged on the right side of the inner cavity of the primary filter box (1), and the second floating block (18) is located on the upper side of the primary filter plate (101); a third contact sensor (19) for opening and closing the second electromagnetic valve (1601) is also arranged on the right side of the inner cavity of the primary filter box (1), and the third contact sensor (19) is arranged on the lower side of the water inlet end of the sewage pipe (16). A third floating block (20) corresponding to the third contact sensor (19) is slidably arranged on the right side of the inner cavity of the primary filter box (1), and the third floating block (20) is located on the lower side of the primary filter plate (101).

3. The multi-stage filter system according to claim 1, characterized in that: The end of the connecting pipe (5) located in the primary filter box (1) is connected to a flushing assembly (6), and the flushing assembly (6) is used to increase the flushing area of ​​the primary filter plate (101).

4. The multi-stage filter system according to claim 3, characterized in that: The flushing assembly (6) comprises a sleeve (601), the sleeve (601) being sleeved on the end of the connecting pipe (5) and being connected to the connecting pipe (5), and at least four groups of spray pipes (602) being equidistantly arranged on the outer circumference of the sleeve (601); wherein the spray pipe (602) is connected to the sleeve (601), and six groups of spray holes are equidistantly opened at the bottom of the spray pipe (602), and the spray holes are connected to the spray pipe (602).

5. The multi-stage filter system according to claim 1, characterized in that: The end of the connecting pipe (5) located in the secondary filter box (2) is connected to a vertical pipe (7) with an opening at the bottom, a stirring rod is rotatably arranged in the vertical pipe (7), and the top of the stirring rod is rotatably connected to the top of the inner cavity of the secondary filter box (2); a driving motor (13) for driving the stirring rod to rotate is arranged at the top of the secondary filter box (2); the driving motor (13) drives the stirring rod to rotate so as to generate a vortex in the secondary filter box (2), so as to gather the dirt flushed back from the secondary filter plate (201) in the middle and at the bottom opening of the vertical pipe (7).

6. The multi-stage filter system according to claim 5, characterized in that: A cleaning rod (11) for scraping off dirt is arranged at the bottom of the stirring rod.

7. The multi-stage filter system according to claim 6, characterized in that: A paddle (12) is fixedly sleeved on the stirring rod.

8. The multi-stage filter system according to claim 7, characterized in that: The stirring rod comprises an upper driving rod (8), a lower driving rod (10) and a differential (9); the top of the upper driving rod (8) is rotatably connected to the top of the inner cavity of the secondary filter box (2); the driving motor (13) is used to drive the upper driving rod (8) to rotate; the paddle (12) is fixedly sleeved on the outer periphery of the upper driving rod (8); the bottom of the upper driving rod (8) is provided with a differential (9); the differential (9) is fixedly arranged on the top of the vertical pipe (7); the bottom of the differential (9) is provided with a lower driving rod (10); the differential (9) is used to transmit the upper driving rod (8) and the lower driving rod (10) and make the rotation speed of the lower driving rod (10) lower than that of the upper driving rod (8); the bottom end of the lower driving rod (10) is connected to the top of the cleaning rod (11).

9. The multi-stage filter system according to claim 8, characterized in that: The differential (9) comprises a housing (901), wherein the housing (901) is fixedly arranged on the top of the vertical tube (7), the top of the housing (901) is rotatably connected to the upper drive rod (8), and the bottom of the housing (901) is rotatably connected to the lower drive rod (10); a gear ring (902) is fixedly connected to the inner periphery of the housing (901), and a central gear (903) is fixedly connected to the bottom of the upper drive rod (8), and the central gear (903) and the gear ring (902) are connected to each other. At least one group of satellite gears (904) is arranged between the two gears, and the satellite gears (904) are respectively meshed with the gear ring (902) and the central gear (903); a turntable (906) is fixedly arranged on the top of the lower driving rod (10), and the bottom of the turntable (906) overlaps with the bottom of the inner cavity of the shell (901); a connecting rod (905) is rotatably arranged at the center of the bottom circle of the satellite gear (904), and the other end of the connecting rod (905) is rotatably connected to the top of the turntable (906).

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