CN108434858B - Self-cleaning continuous filter - Google Patents

Abstract

The application relates to the technical field of water-saving irrigation filter devices, in particular to a self-cleaning net drum type continuous filter which comprises a filter drum, a sewage draining rotating shaft, a flushing pipe rack and a sewage collecting tank, wherein the filter drum is a horizontal cylinder with an axis arranged horizontally, the left end of the filter drum is fixedly provided with a left cone drum ring with a small left side and a large right side, the right end of the filter drum is fixedly provided with a right cone drum ring with a large left side and a small right side, and the center of an inner cavity at the left end of the left cone drum ring or the filter drum is fixedly provided with a left mandrel seat. The application has reasonable and compact structure and convenient use, the high-pressure water flow sprayed out by the flushing pipe rack flushes the upper part of the filter screen cylinder and drives the filter screen cylinder to rotate, can avoid the mesh blockage, prevent the formation of filter cakes and increase the filtering area, and continuously discharges dirt through the dirt collecting tank and the dirt discharging shaft cavity, so that the filtration and the dirt discharging are carried out simultaneously without interference, the energy consumption is reduced, the filtration efficiency is improved, the water head loss can be obviously reduced, the energy is saved when the application is used for the sediment filtration before the pump, and the application has the characteristics of simple structure, high efficiency and energy conservation.

Description

Self-cleaning continuous filter

Technical Field

The present application relates to the technical field of water-saving irrigation filter devices, and is a self-cleaning net-cylinder type continuous filter.

Background technique

Water-saving irrigation has great strategic significance in the sustainable development of the economy and society. The goal set in the National Agricultural Water-Saving Outline is that the effective irrigation area of farmland in China will reach 1 billion mu, the area of new water-saving irrigation projects will be 300 million mu, of which the area of new high-efficiency water-saving irrigation projects will be more than 150 million mu, the water utilization coefficient of farmland irrigation will reach more than 0.55, the area of water-saving technology promotion for dry crops will reach more than 500 million mu, and the coverage rate of high-efficiency water-use technology will reach more than 50%. Micro-irrigation engineering technology plays an important role in efficient water saving. The first hub of the micro-irrigation system is the core of the entire system. However, since the irrigation water source often has high sand content, large sediment particle size, and many microorganisms, it is easy to cause the blockage of drippers, micro-sprinklers and other irrigation devices, affecting the quality of irrigation water, resulting in crop yield reduction, and even causing the entire micro-irrigation system to be paralyzed in severe cases. In order to ensure the normal operation of the micro-irrigation system, the treatment of irrigation water is particularly important. At present, a sedimentation tank is usually set up and a combined filter is configured to further settle and filter the irrigation water, and then the filtered water is transported to the pipeline system for micro-irrigation. However, the existing filtering devices such as hydraulic cyclone filters, sand and gravel filters, mesh filters and laminated filters, as well as the combined filters composed of them, are all post-pump filters, which have the problems of easy clogging, low filtration efficiency, frequent flushing, high cost and energy consumption, etc., and cannot meet the actual needs of water-saving irrigation, which seriously restricts the rapid promotion and application of advanced water-saving irrigation technology.

Summary of the invention

The purpose of the present application is to provide a self-cleaning mesh cylinder type continuous filter, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of easy clogging, low filtration efficiency, frequent flushing, high cost and energy consumption in the existing water-saving irrigation filter device.

The purpose of the present application is achieved in this way: a self-cleaning mesh cylinder type continuous filter, including a filter cylinder, a sewage discharge shaft, a flushing pipe rack and a sewage collection tank, the filter cylinder is a horizontal cylindrical cylinder arranged along the axis horizontally, a left cone cylinder ring with a small left and a large right is fixed to the left end of the filter cylinder, a right cone cylinder ring with a large left and a small right is fixed to the right end of the filter cylinder, a left spindle seat is fixed to the center of the inner cavity of the left cone cylinder ring or the left end of the filter cylinder, and a right spindle seat is fixed to the center of the inner cavity of the right cone cylinder ring or the right end of the filter cylinder, the filter cylinder is installed on the sewage discharge shaft through the left spindle seat and the right spindle seat and can rotate, and the left and right ends of the sewage discharge shaft extend to the filter cylinder respectively A flushing pipe rack is installed on the left and right sides, and the flushing pipe rack can spray high-pressure water to the outside of the filter screen cylinder and rotate the filter screen cylinder. A water inlet pipe is arranged on the left side of the left cone cylinder circle, and the right end of the water inlet pipe extends into the inner cavity of the left cone cylinder circle and is provided with a water outlet. The inner cavity of the water inlet pipe is communicated with the inner cavity of the left cone cylinder circle through the water outlet. There is a sewage discharge shaft cavity inside the sewage discharge shaft, and a sewage collecting tank is fixed on the sewage discharge shaft between the left spindle seat and the right spindle seat. A sewage discharge through hole connecting the bottom of the inner cavity of the sewage collecting tank and the sewage discharge shaft cavity is provided on the sewage discharge shaft. A sewage discharge port is arranged on the right end of the sewage discharge shaft, and the inner cavity of the sewage collecting tank is communicated with the sewage discharge port through the sewage discharge through hole and the sewage discharge shaft cavity.

Furthermore, the sewage collecting trough includes a left trough plate, a right trough plate, a front trough plate, a rear trough plate and a trough bottom plate. The left trough plate, the front trough plate, the right trough plate and the rear trough plate are connected in sequence to form a bucket-shaped guide trough that is larger at the top and smaller at the bottom. The lower end of the guide trough is welded and fixed to the sewage discharge shaft. The bottom of the guide trough is fixed with a trough bottom plate inclined in the direction of higher on the left and lower on the right. A sewage collecting outlet is provided on the right part of the trough bottom plate corresponding to the position of the sewage discharge through hole. The inner cavity of the guide trough is connected with the sewage discharge shaft cavity through the sewage collecting outlet and the sewage discharge through hole.

Furthermore, at least three filter cartridge blades are arranged on the outside of the filter screen cartridge, the inner end of each filter cartridge blade is fixed on the filter screen cartridge, and each filter cartridge blade is evenly and symmetrically arranged along the circumference of the outside of the filter screen cartridge.

Furthermore, a conical water distribution plate is fixed on the water inlet pipe near the water outlet, and the edge of the conical water distribution plate is fixed to the water inlet pipe by no less than two connecting rods. A gap is formed between the conical surface of the conical water distribution plate and the water outlet, and the apex of the conical water distribution plate faces the center of the water outlet.

Furthermore, the filter screen cylinder includes a filter screen layer, a protective screen layer and a supporting grid rod, the protective screen layer is located outside the filter screen layer, and a supporting grid rod is provided outside the protective screen layer, and the filter screen layer and the protective screen layer are hard filter screens.

Furthermore, the water inlet pipe has a branch pipe opening connected to a sewage cleaning branch pipe, the sewage cleaning branch pipe is provided with a sewage cleaning valve, the left end of the sewage discharge shaft is provided with a sewage cleaning water inlet communicating with the sewage discharge shaft cavity, and the right end of the sewage cleaning branch pipe is connected to the sewage cleaning water inlet.

Furthermore, an inlet valve is provided on the water inlet pipe, the inlet valve is a solenoid valve or an electric valve, the sewage cleaning valve is a solenoid valve or an electric valve, the control terminals of the inlet valve and the sewage cleaning valve are electrically connected to the controller, and a liquid level sensor is provided on the upper inner wall of the sewage collecting tank, and the output terminal of the liquid level sensor is electrically connected to the controller.

Furthermore, the flushing pipe rack includes a left frame rod, a right frame rod, a left vertical pipe, a right vertical pipe, an upper nozzle pipe, a left horizontal pipe, a right horizontal pipe and a front nozzle pipe. The left frame rod is fixed on the sewage discharge rotating shaft on the left side of the left cone cylinder circle, and the right frame rod is fixed on the sewage discharge rotating shaft on the right side of the right cone cylinder circle. The left vertical pipe is fixed at the upper end of the left frame rod, and the right vertical pipe is fixed at the upper end of the right frame rod. The left and right ends of the upper nozzle pipe are respectively connected with the upper ends of the left vertical pipe and the right vertical pipe, the left horizontal pipe extending forward is fixed at the lower end of the left vertical pipe, and the right horizontal pipe extending forward is fixed at the lower end of the right vertical pipe, and the left and right ends of the front nozzle pipe are respectively connected with the front ends of the left horizontal pipe and the right horizontal pipe, and the lower end of the upper nozzle pipe and the front lower end of the front nozzle corresponding to the position of the filter screen cylinder are evenly distributed with flushing holes along the length direction, and a water diversion interface is provided on the left vertical pipe or the right vertical pipe or the left horizontal pipe or the right horizontal pipe and is connected with a water diversion pipe, and the water diversion pipe is connected with a pressure water pump that can transport part of the clean water filtered by the filter screen cylinder to the water diversion interface.

The present application has a reasonable and compact structure and is easy to use. It flushes the upper part of the filter screen cylinder with high-pressure water flow sprayed from the flushing pipe rack and drives it to rotate, which can avoid mesh blockage, prevent filter cake formation, and increase the filtration area. Dirt is continuously discharged through the sewage sump and the sewage discharge shaft cavity, so that filtering and sewage discharge are carried out simultaneously without interfering with each other, thereby reducing energy consumption and improving filtration efficiency. It is used for sediment filtration before the pump to significantly reduce head loss and save energy, and has the characteristics of simple structure and high efficiency and energy saving.

BRIEF DESCRIPTION OF THE DRAWINGS

The specific structure of this application is given by the following drawings and embodiments:

FIG1 is a schematic diagram of a partial cross-sectional structure of a preferred embodiment of the present application;

Fig. 2 is a schematic diagram of an enlarged cross-sectional view of the structure at A-A in Fig. 1;

FIG3 is a schematic diagram of the working state of the present application.

Legend: 1. Filter screen, 2. Drain shaft, 3. Drain tank, 4. Left cone ring, 5. Right cone ring, 6. Left spindle seat, 7. Right spindle seat, 8. Water inlet pipe, 9. Water outlet, 10. Drain shaft cavity, 11. Drain hole, 12. Drain port, 13. Groove bottom plate, 14. Drain branch pipe, 15. Drain valve, 16. Drain water inlet, 17. Filter blades, 18. Conical water distribution plate, 19. , connecting rod, 20, left frame rod, 21, right frame rod, 22, left vertical pipe, 23, right vertical pipe, 24, upper nozzle, 25, front nozzle, 26, water diversion interface, 27, water diversion pipe, 28, pressure water pump, 29, water inlet valve, 30, liquid level sensor, 31, sedimentation tank, 32, filter tank, 33, outlet pipe, 34, sewage tank, 35, return pipe, 36, trash rack, 37, return water filter.

Detailed ways

The present application is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of the present application and actual conditions.

Embodiment: As shown in Figures 1-3, the self-cleaning net-drum continuous filter comprises a filter net drum 1, a sewage rotating shaft 2, a flushing pipe rack and a sewage collecting tank 3. The filter net drum 1 is a horizontal cylindrical cylinder with its axis arranged horizontally. A left cone drum ring 4 with a small left and a large right is fixed to the left end of the filter net drum 1, and a right cone drum ring 5 with a large left and a small right is fixed to the right end of the filter net drum 1. A left spindle seat 6 is fixed to the center of the inner cavity of the left cone drum ring 4 or the left end of the filter net drum 1, and a right spindle seat 7 is fixed to the center of the inner cavity of the right cone drum ring 5 or the right end of the filter net drum 1. The filter net drum 1 is installed on the sewage rotating shaft 2 through the left spindle seat 6 and the right spindle seat 7 and can rotate. The left and right ends of the sewage rotating shaft 2 extend to the left and right sides of the filter net drum 1 and are installed There is a flushing pipe rack, which can spray high-pressure water flow to the outside of the filter screen cylinder 1 and make the filter screen cylinder 1 rotate. A water inlet pipe 8 is provided on the left side of the left cone cylinder circle 4. The right end of the water inlet pipe 8 extends into the inner cavity of the left cone cylinder circle 4 and is provided with a water outlet 9. The inner cavity of the water inlet pipe 8 is communicated with the inner cavity of the left cone cylinder circle 4 through the water outlet 9. There is a sewage shaft cavity 10 inside the sewage discharge shaft 2. A sewage collecting tank 3 is fixed on the sewage discharge shaft 2 between the left spindle seat 6 and the right spindle seat 7. A sewage through hole 11 connecting the bottom of the inner cavity of the sewage collecting tank 3 and the sewage shaft cavity 10 is provided on the sewage discharge shaft 2. A sewage outlet 12 is provided on the right end of the sewage discharge shaft 2. The inner cavity of the sewage collecting tank 3 is communicated with the sewage outlet 12 through the sewage through hole 11 and the sewage shaft cavity 10. During the filtering operation, the high-pressure water flow sprayed from the flushing pipe rack is used to flush the upper part of the filter screen cylinder 1 and drive the filter screen cylinder 1 to rotate. The rotation of the filter screen cylinder 1 can avoid mesh blockage, prevent filter cake formation, and increase the filtering area. The sewage is collected and discharged through the sewage collecting tank 3, and the sewage is continuously discharged through the sewage discharge through hole 11, the sewage discharge shaft cavity 10, and the sewage discharge port 12, so that filtering and sewage discharge are carried out simultaneously without interfering with each other, and the filtering efficiency is improved while reducing energy consumption. The commonly used post-pump filtration form is changed to pre-pump filtration, which can significantly reduce head loss and save energy. The present application can replace the existing filter for sediment filtration, has the characteristics of simple structure, high efficiency and energy saving, realizes pre-pump filtration, and solves the outstanding problems of easy clogging and high energy consumption of the existing filter.

As shown in Fig. 1-3, the sewage collecting tank 3 comprises a left tank plate, a right tank plate, a front tank plate, a rear tank plate and a tank bottom plate 13. The left tank plate, the front tank plate, the right tank plate and the rear tank plate are connected in sequence to form a bucket-shaped guide tank with a large upper portion and a small lower portion. The lower end of the guide tank is welded and fixed to the sewage discharge shaft 2. The bottom of the guide tank is fixed with a tank bottom plate 13 inclined in the direction of high on the left and low on the right. A sewage collecting outlet is provided at the right part of the tank bottom plate 13 corresponding to the position of the sewage discharge through hole 11. The inner cavity of the guide tank is connected with the sewage discharge shaft cavity 10 through the sewage collecting outlet and the sewage discharge through hole 11. In actual use, it is best to make the upper ends of the front tank plate and the rear tank plate as close as possible to the upper inner wall of the filter screen cylinder 1 so as to receive more of the washed dirt; the tank bottom plate 13 is set to be high on the left and low on the right, so that the dirt collected on the tank bottom plate 13 can quickly enter the sewage discharge through hole 11 from the sewage collecting outlet along with the water flow.

As shown in Fig. 1-2, at least three filter cartridge blades 17 are arranged on the outside of the filter screen cylinder 1, and the inner end of each filter cartridge blade 17 is fixed on the filter screen cylinder 1, and each filter cartridge blade 17 is evenly and symmetrically arranged along the outer circumference of the filter screen cylinder 1. The filter cartridge blades 17 can effectively drive the filter screen cylinder 1 to rotate by the high-pressure water flow sprayed by the flushing pipe rack, further reducing energy loss and saving costs.

As shown in Figs. 1 and 3, a conical water distribution plate 18 is fixed on the water inlet pipe 8 near the water outlet 9. The edge of the conical water distribution plate 18 is fixed on the water inlet pipe 8 by at least two connecting rods 19. A gap is formed between the conical surface of the conical water distribution plate 18 and the water outlet 9. The apex of the conical water distribution plate 18 faces the center of the water outlet 9. The conical water distribution plate 18 can disperse the irrigation water to be filtered delivered by the water inlet pipe 8 as much as possible and effectively slow down, which is conducive to the separation of dirt, while reducing the impact on the filter screen cylinder 1, and the filtering effect is better; in actual use, the number of connecting rods 19 is preferably three and evenly arranged, so that the use effect is better, it is easy to manufacture and the connection strength is also better.

According to actual needs, the filter screen cylinder 1 includes a filter screen layer, a protective screen layer and a supporting grid rod. The protective screen layer is located outside the filter screen layer, and a supporting grid rod is arranged outside the protective screen layer. The filter screen layer and the protective screen layer are hard filter screens. The filter screen layer and the protective screen layer form a double-layer filter screen, and the filter screen is fixed, supported and protected by the supporting grid rod, which not only has a better filtering effect, but also has a higher filter screen strength, and the service life of the filter screen cylinder 1 is longer.

As shown in Figs. 1 and 3, the water inlet pipe 8 has a branch pipe opening and is connected with a cleaning branch pipe 14, the cleaning branch pipe 14 is provided with a cleaning valve 15, the left end of the sewage discharge shaft 2 is provided with a cleaning water inlet 16 communicating with the sewage discharge shaft cavity 10, and the right end of the cleaning branch pipe 14 is connected with the cleaning water inlet 16. The sewage discharge shaft cavity 10 can be flushed by the pressure water flow in the water inlet pipe 8 through the cleaning branch pipe 14, and the sewage can be effectively cleaned. The cleaning valve 15 can control the clean water flow according to actual needs, which is more convenient to use.

As shown in Fig. 1-3, the water inlet pipe 8 is provided with a water inlet valve 29, which is a solenoid valve or an electric valve, and the cleaning valve 15 is a solenoid valve or an electric valve. The control terminals of the water inlet valve 29 and the cleaning valve 15 are electrically connected to the controller, and a liquid level sensor 30 is provided on the upper inner wall of the sewage collection tank 3, and the output terminal of the liquid level sensor 30 is electrically connected to the controller. In actual use, the automatic cleaning of the sewage discharge shaft cavity 10 is performed according to the preset liquid level and preset time of the sewage collection tank 3 through the program pre-set by the controller, which is not only more convenient to use, but also can effectively reduce energy consumption and achieve effective filtration.

As shown in Figures 1-3, the flushing pipe rack includes a left rack rod 20, a right rack rod 21, a left vertical pipe 22, a right vertical pipe 23, an upper nozzle 24, a left horizontal pipe, a right horizontal pipe and a front nozzle 25. The left rack rod 20 is fixed to the sewage discharge shaft 2 on the left side of the left cone cylinder circle 4, and the right rack rod 21 is fixed to the sewage discharge shaft 2 on the right side of the right cone cylinder circle 5. The left vertical pipe 22 is fixed to the upper end of the left rack rod 20, and the right vertical pipe 23 is fixed to the upper end of the right rack rod 21. The left and right ends of the upper nozzle 24 are respectively connected to the upper ends of the left vertical pipe 22 and the right vertical pipe 23. The lower end of the left vertical pipe 22 is fixed with A left horizontal pipe extending forward, a right horizontal pipe extending forward is fixed to the lower end of the right vertical pipe 23, the left and right ends of the front nozzle pipe 25 are respectively connected to the front ends of the left horizontal pipe and the right horizontal pipe, the lower end of the upper nozzle pipe 24 corresponding to the position of the filter screen cylinder 1 and the front lower end of the front nozzle pipe 25 are respectively provided with flushing holes evenly distributed along the length direction, the left vertical pipe 22 or the right vertical pipe 23 or the left horizontal pipe or the right horizontal pipe is provided with a water diversion interface 26 and is connected to a water diversion pipe 27, and the water diversion pipe 27 is connected to a pressure water pump 28 that can transport part of the clean water filtered by the filter screen cylinder 1 to the water diversion interface 26. The high-pressure water flow sprayed out through the flushing hole of the upper nozzle 24 vertically flushes the filter screen, and the high-pressure water flow sprayed out through the flushing hole of the front nozzle 25 drives the filter screen cylinder 1 to rotate, which solves the problem that the dirt embedded in the mesh is difficult to remove and greatly improves the flushing rate; the pressure water pump 28 can absorb part of the filtered clean water and form a high-pressure water flow to transport it to the upper nozzle 24 and the front nozzle 25; the flushing hole of the front nozzle 25 is located at its front lower end, which can make the impact of the sprayed water flow push the filter screen cylinder 1 to rotate along the tangential direction, and the use effect is better.

The above description is only an example for clearly explaining the present application, and is not intended to limit the implementation methods of the present application. Any obvious changes or modifications derived from the technical solution of the present application are still within the scope of protection of the present application.

The working process of the present application is as follows: as shown in Figure 3, a desilting tank 31 is set in advance and the irrigation water to be filtered is stored. The inlet of the water inlet pipe 8 is located in the desilting tank 31 and is provided with a trash rack 36. It is best to make the pressure head of the irrigation water to be filtered in the water inlet pipe 8 0.2 to 0.5 meters. A filter tank 32 isolated from the desilting tank 31 is set, and the present application is installed above the filter tank 32. The filter tank 32 is provided with an outlet pipe 33 with a valve, and the outlet pipe 33 can be connected to the pipeline system of water-saving irrigation to realize water supply. The pressure water pump 28 is installed at the bottom of the filter tank 32 or on the branch of the outlet pipe 33. Before the pressure water pump 28 is turned on, a part of water must be reserved in the filter tank 32 for the pressure water pump 28 to extract. A sewage tank 34 is set at the position corresponding to the sewage outlet 12. The position of the sewage tank 34 is higher than the filter tank 32 and there is a return pipe 35 with a return water filter 37 at its lower part, and the outlet of the return pipe 35 is connected to the upper part of the filter tank 32. When filtering, first, the controller opens the water inlet valve 29 and keeps the cleaning valve 15 closed. At the same time, the pressure water pump 28 is started. After the irrigation water to be filtered in the sedimentation tank 31 passes through the trash rack 36, it enters the left cone ring 4 and the filter screen cylinder 1 through the water inlet pipe 8, and is filtered from the inside to the outside through the filter screen cylinder 1. All dirt larger than the filter screen aperture size is trapped in the filter screen cylinder 1. The pressure water pump 28 transports the filtered clean water to the upper nozzle 24 and the front nozzle 25 through the water diversion pipe 27. The front nozzle The high-pressure water flow ejected by the upper nozzle 25 pushes the filter cartridge blades 17 to rotate the filter screen cartridge 1. As the filter screen cartridge 1 rotates, the dirt adhering to the filter screen is flushed into the sewage collection tank 3 by the high-pressure water flow ejected by the upper nozzle 24, and enters the sewage collection tank 34 through the sewage discharge shaft cavity 10 and the sewage discharge port 12 with the water flow. The clean water filtered by the filter screen cartridge 1 continuously enters the filter tank 32. The clean water in the filter tank 32 enters the pipeline system through the outlet pipe 33 and is transported to the field by pressurization or self-pressure. Then, as the sewage discharge passage approaches, the clean water in the filter tank 32 enters the pipeline system through the outlet pipe 33 and is transported to the field by pressurization or self-pressure. The accumulation of dirt in the sewage shaft cavity 10 at the hole 11 causes the sewage shaft cavity 10 to be gradually blocked and the water level in the sewage collection tank 3 to gradually rise. When the actual water level in the sewage collection tank 3 is higher than the liquid level sensor 30, the liquid level sensor 30 sends a signal to the controller to automatically open the sewage cleaning valve 15, and the pressure water flow in the water inlet pipe 8 thoroughly rinses and dredges the sewage shaft cavity 10 through the sewage cleaning branch pipe 14, and the accumulated dirt in the sewage shaft cavity 10 flows into the sewage tank 34 with the water flow, and the muddy water collected in the sewage tank 34 is filtered by the return water filter 37 after sedimentation, and enters the filter tank 32 through the return water pipe 35 to be reused, thereby reducing water consumption as much as possible; finally, when the preset cleaning time is reached, or the actual water level value in the sewage collection tank 3 drops below the position of the liquid level sensor 30, the controller automatically closes the sewage cleaning valve 15, and the sewage cleaning ends, so that while continuously filtering the irrigation water, the sewage cleaning operation can be automatically performed as needed, thereby significantly improving the filtration efficiency under the premise of reducing energy consumption.

Claims (5)

1. A self-cleaning mesh drum type continuous filter, characterized in that it comprises a filter drum, a sewage discharge shaft, a flushing pipe rack and a sewage collecting tank, the filter drum being a horizontal cylindrical drum arranged along the axis line, a left cone cylinder ring with a small left and a large right is fixed to the left end of the filter drum, and a right cone cylinder ring with a large left and a small right is fixed to the right end of the filter drum, a left spindle seat is fixed to the center of the inner cavity of the left cone cylinder ring or the left end of the filter drum, and a right spindle seat is fixed to the center of the inner cavity of the right cone cylinder ring or the right end of the filter drum, the filter drum is mounted on the sewage discharge shaft through the left spindle seat and the right spindle seat and can rotate, the left and right ends of the sewage discharge shaft respectively extend to the left and right sides of the filter drum and are installed with a flushing pipe rack, the flushing pipe rack can spray high-pressure water flow to the outside of the filter drum and make the filter drum rotate, the left cone cylinder ring A water inlet pipe is provided on the left side of the cylinder ring, and the right end of the water inlet pipe extends into the inner cavity of the left conical cylinder ring and is provided with a water outlet. The water outlet is arranged downward and toward the inner wall of the left conical cylinder ring, and the inner cavity of the water inlet pipe is communicated with the inner cavity of the left conical cylinder ring through the water outlet. There is a sewage discharge shaft cavity inside the sewage discharge shaft, and a sewage collecting tank is fixed on the sewage discharge shaft between the left spindle seat and the right spindle seat. A sewage discharge through hole connecting the bottom of the inner cavity of the sewage collecting tank and the sewage discharge shaft cavity is provided on the sewage discharge shaft, and a sewage discharge port is provided on the right end of the sewage discharge shaft, and the inner cavity of the sewage collecting tank is connected with the sewage discharge port through the sewage discharge through hole and the sewage discharge shaft cavity; there is a branch pipe opening on the water inlet pipe and is connected with a sewage cleaning branch pipe, and a sewage cleaning valve is provided on the sewage cleaning branch pipe, and a sewage cleaning water inlet communicating with the sewage discharge shaft cavity is provided at the left end of the sewage discharge shaft, and the right end of the sewage cleaning branch pipe is communicated with the sewage cleaning water inlet. 2. The self-cleaning mesh cylinder type continuous filter as described in claim 1 is characterized in that: the sewage collecting tank includes a left groove plate, a right groove plate, a front groove plate, a rear groove plate and a groove bottom plate, the left groove plate, the front groove plate, the right groove plate and the rear groove plate are connected in sequence to form a bucket-shaped guide groove with a larger upper part and a smaller lower part, the lower end of the guide groove is welded and fixed to the sewage discharge shaft, the bottom of the guide groove is fixed with a groove bottom plate inclined in the direction of higher left and lower right, a sewage collecting outlet is provided on the right part of the groove bottom plate corresponding to the position of the sewage discharge through hole, and the inner cavity of the guide groove is connected with the sewage discharge shaft cavity through the sewage collecting outlet and the sewage discharge through hole; or/and, at least three filter cartridge blades are provided on the outer side of the filter mesh cylinder, The inner end of each filter cartridge blade is fixed on the filter mesh cylinder, and each filter cartridge blade is evenly and symmetrically arranged along the outer circumference of the filter mesh cylinder; or/and, a conical water distribution plate is fixed on the water inlet pipe near the water outlet, and the edge of the conical water distribution plate is fixed to the water inlet pipe by no less than two connecting rods, and a gap is formed between the conical surface of the conical water distribution plate and the water outlet, and the apex of the conical water distribution plate faces the center of the water outlet; or/and, the filter mesh cylinder includes a filter mesh layer, a protective mesh layer and a supporting grid rod, the protective mesh layer is located outside the filter mesh layer, and a supporting grid rod is provided outside the protective mesh layer, and the filter mesh layer and the protective mesh layer are hard filter meshes. 3. The self-cleaning mesh cylinder continuous filter as described in claim 1 or 2 is characterized in that: a water inlet valve is provided on the water inlet pipe, the water inlet valve is a solenoid valve or an electric valve, the sewage cleaning valve is a solenoid valve or an electric valve, the control terminals of the water inlet valve and the sewage cleaning valve are electrically connected to the controller, a liquid level sensor is provided on the upper inner wall of the sewage collecting tank, and the output terminal of the liquid level sensor is electrically connected to the controller. 4. The self-cleaning mesh cylinder type continuous filter as described in claim 1 or 2 is characterized in that: the flushing pipe rack includes a left rack rod, a right rack rod, a left vertical pipe, a right vertical pipe, an upper nozzle, a left horizontal pipe, a right horizontal pipe and a front nozzle, a left rack rod is fixed on the sewage discharge shaft on the left side of the left cone cylinder circle, a right rack rod is fixed on the sewage discharge shaft on the right side of the right cone cylinder circle, a left vertical pipe is fixed on the upper end of the left rack rod, a right vertical pipe is fixed on the upper end of the right rack rod, the left and right ends of the upper nozzle are respectively connected to the upper ends of the left vertical pipe and the right vertical pipe, and the left vertical pipe is fixed on the upper end of the right vertical pipe. A left horizontal pipe extending forward is fixed to the lower end of the pipe, a right horizontal pipe extending forward is fixed to the lower end of the right vertical pipe, the left and right ends of the front nozzle are respectively connected to the front ends of the left horizontal pipe and the right horizontal pipe, the lower end of the upper nozzle pipe corresponding to the position of the filter screen cylinder and the front lower end of the front nozzle are respectively provided with flushing holes along the length direction, a water diversion interface is provided on the left vertical pipe or the right vertical pipe or the left horizontal pipe or the right horizontal pipe and is connected to a water diversion pipe, and the water diversion pipe is connected to a pressure water pump that can transport part of the clean water filtered by the filter screen cylinder to the water diversion interface. 5. The self-cleaning mesh cylinder type continuous filter as described in claim 3 is characterized in that: the flushing pipe rack includes a left rack rod, a right rack rod, a left vertical pipe, a right vertical pipe, an upper nozzle, a left horizontal pipe, a right horizontal pipe and a front nozzle, a left rack rod is fixed on the sewage discharge shaft on the left side of the left cone cylinder circle, a right rack rod is fixed on the sewage discharge shaft on the right side of the right cone cylinder circle, a left vertical pipe is fixed on the upper end of the left rack rod, a right vertical pipe is fixed on the upper end of the right rack rod, the left and right ends of the upper nozzle are respectively connected to the upper ends of the left vertical pipe and the right vertical pipe, and the left vertical pipe A left horizontal pipe extending forward is fixed at the lower end, a right horizontal pipe extending forward is fixed at the lower end of the right vertical pipe, the left and right ends of the front nozzle are respectively connected to the front ends of the left and right horizontal pipes, the lower end of the upper nozzle corresponding to the position of the filter screen cylinder and the front lower end of the front nozzle are respectively provided with flushing holes along the length direction, a water diversion interface is provided on the left vertical pipe or the right vertical pipe or the left horizontal pipe or the right horizontal pipe and is connected to a water diversion pipe, and the water diversion pipe is connected to a pressure water pump that can transport part of the clean water filtered by the filter screen cylinder to the water diversion interface.