Micro-pressure filter before pump

Abstract

The present application relates to the technical field of water-saving irrigation filtering devices, and is a micro-pressure filtering device before a pump, which includes a filter screen cylinder, a left joint, a right joint, a left water diversion seat, a right water diversion seat and a water divider. The filter screen cylinder is a horizontal cylindrical cylinder with an axis arranged horizontally, and a left joint that can be connected to a left water inlet pipeline is fixed on the left end of the filter screen cylinder. The present application has a reasonable and compact structure and is easy to use. The water divider installed in the filter screen cylinder can effectively increase the flow rate of the water flow near the filter screen. By opening the pipeline or valve connected to the right joint, the inner wall of the filter screen cylinder can be flushed and cleaned, which can avoid mesh blockage, prevent filter cake formation, increase the filtering area, effectively improve the filtering capacity, and significantly improve the filtering efficiency. The filtration is not affected when discharging sewage, and uninterrupted water supply can be achieved. It has the characteristics of good filtering effect, can significantly reduce energy consumption, save energy, and is easy to disassemble and assemble, easy to clean, and easy to operate.

Description

Technical Field

[0001] The present application relates to the technical field of water-saving irrigation filtering devices, and is a pre-pump micro-pressure filtering device. Background Art

[0002] Micro-irrigation engineering technology plays an important role in efficient water conservation. How to effectively use surface water from mountain streams for micro-irrigation has become the key to promoting efficient water-saving technology. However, since irrigation water sources often have high sand content and large sand particle size, it is easy to cause blockage of emitters, 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 sediment cascade treatment method is currently mainly adopted. Usually, multi-stage sediment treatment engineering facilities are set up on the water diversion channel system to achieve the purpose of efficient sediment discharge and water diversion. Common primary sediment treatment engineering facilities include: river gate type, bend type, bottom fence type and layered water diversion engineering, etc. However, the treated water flow often cannot fully meet the treatment limit requirements for sand content and particle size. It is necessary to build secondary sediment treatment engineering facilities at the water inlet or its downstream channel, which increases the investment in the irrigation system and causes a high cost of irrigation water treatment.

[0003] At present, the main method is to set up a sand settling tank and configure a floating pre-pump filter to further settle and filter the irrigation water, and then transport the filtered water to the pipeline system for micro-irrigation. The floating pre-pump filter is commonly known as "floating on water". It can effectively remove impurities in the water and has a good filtering effect. However, the impurities filtered out are always in the sand settling tank, which requires manual cleaning and special personnel to guard it. It consumes more human resources, and it requires external power to rotate the filter screen and flush impurities. There are problems such as consuming human resources, easy clogging, low filtering efficiency, high cost and energy consumption, which cannot meet the actual needs of water-saving irrigation. Summary of the invention

[0004] The purpose of the present application is to provide a pre-pump micro-pressure filtration device, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of the existing pre-pump filtration device for water-saving irrigation, such as consuming human resources, being easy to clog, having low filtration efficiency, and having high cost and energy consumption.

[0005] The purpose of the present application is achieved in this way: a pre-pump micro-pressure filtering device comprises a filter screen cylinder, a left joint, a right joint, a left water diversion seat, a right water diversion seat and a water divider, the filter screen cylinder is a horizontal cylindrical cylinder with an axis arranged horizontally, a left joint that can be connected to a left water inlet pipeline is fixed to the left end of the filter screen cylinder, a right joint that can be connected to a right sewage discharge pipeline is fixed to the right end of the filter screen cylinder, a left water diversion seat is fixed to the center of the inner cavity of the left joint or the left end of the filter screen cylinder, and a right water diversion seat is fixed to the center of the inner cavity of the right joint or the right end of the filter screen cylinder, and the water divider is installed in the filter screen cylinder through the left water diversion seat and the right water diversion seat, and the water divider comprises a variable diameter core body and a guide radial plate, the middle part of the variable diameter core body has a large outer diameter and the left and right ends have small outer diameters, and no less than three guide radial plates are fixed to the outside of the variable diameter core body, and each guide radial plate is evenly arranged along the outer circumference of the variable diameter core body, the outer edge of the guide radial plate is close to the inner wall of the filter screen cylinder, and the left and right ends of the guide radial plate extend to the left and right ends of the variable diameter core body respectively.

[0006] Furthermore, the filter screen cylinder includes a screen cylinder frame and a filter body. The left and right ends of the cylindrical screen cylinder frame are respectively fixed with a screen frame lining ring with a frame ring flange. The filter screen body is fixed to the outside of the screen cylinder frame. The filter screen body includes a filter screen layer and a protective screen layer. The inner side of the protective screen layer is fixed to the outer side of the screen cylinder frame, and the filter screen layer is fixed to the outer side of the protective screen layer.

[0007] Furthermore, the middle part of the variable diameter core of the water divider is cylindrical, and the projection of the outer surface of the end of the variable diameter core on the vertical plane is an elliptical arc or a parabola or an isosceles trapezoid or an isosceles triangle.

[0008] Furthermore, the guide radial plate of the water divider is a flat plate or a spiral arc plate.

[0009] Furthermore, the left joint includes a joint body, a mesh tube ferrule and a pipe connection screw sleeve. An external groove with a joint external thread is provided on the left outer side surface of the joint body. The pipe connection screw sleeve is fixedly installed in the external groove through the joint external thread. A pipeline installation thread is provided on the inner wall of the pipe connection screw sleeve. A seat bracket is provided on the right inner wall of the joint body. The left water diversion seat is installed in the seat bracket. A guide plate groove is provided at the right end of the left water diversion seat corresponding to the end position of the guide radial plate. Each guide radial plate at the left end of the water diverter is installed on the left water diversion seat through the guide plate groove. An internal groove with a joint internal thread is provided on the right inner wall of the seat bracket. The mesh tube ferrule is fixedly installed in the internal groove through the joint internal thread. A ferrule boss is provided on the right inner wall of the mesh tube ferrule. A limiting clamp ring is installed on the left part of the cylinder frame liner ring at the left end of the filter mesh tube. The ferrule boss of the mesh tube ferrule is pressed against the frame ring flange through the limiting clamp ring. The structure of the right joint is exactly the same as that of the left joint.

[0010] Furthermore, an annular boss is provided at the right end of the left water diversion seat corresponding to the end position of the cylinder frame liner ring, and the right end of the annular boss is pressed against the end face of the cylinder frame liner ring and maintains a seal. A limiting ring platform is provided on the right inner wall of the limiting clamp, and the left end of the limiting ring platform is pressed against the right end face of the frame ring flange, and the left end of the limiting clamp presses the right end of the left water diversion seat.

[0011] Furthermore, the left joint is connected to the grit tank through an inlet pipe, a filter tank is provided outside the filter cylinder, the left joint and the right joint are located in the filter tank, an inlet valve is provided on the inlet pipe, the inner cavity of the filter cylinder is connected with the lower part of the grit tank through the inlet valve and the inlet pipe, the right joint is connected with a sewage cleaning pipe with a sewage cleaning valve, the right end of the sewage cleaning pipe is connected with a sewage discharge hose, and the inner cavity of the filter cylinder can be connected with the sewage discharge hose through the sewage cleaning valve and the sewage cleaning pipe.

[0012] Furthermore, the water inlet valve and the sewage cleaning valve are solenoid valves or electric valves, a liquid level sensor is provided on the upper inner wall of the sand settling tank, the wiring terminals of the water inlet valve and the sewage cleaning valve are electrically connected to the controller, and the signal output terminal of the liquid level sensor is electrically connected to the signal input terminal of the controller.

[0013] Furthermore, a filter housing is installed on the outside of the filter screen cylinder, and a filter cleaning cavity surrounding the filter screen cylinder is arranged inside the filter housing, a left joint is installed on the left part of the filter housing, and a right joint is installed on the right part of the filter housing, the filter screen cylinder isolates the inner cavity of the left joint and the inner cavity of the right joint from the filter cleaning cavity, a water supply port is arranged at the lower part of the filter housing, the inner cavity of the water supply port is connected with the filter cleaning cavity, the left joint includes a joint body and a pipe connection screw sleeve, an outer surface of the left part of the joint body is provided with an external connection groove with a joint external thread, and the pipe connection screw sleeve is fixedly installed on the external connection groove through the joint external thread In the groove, the inner wall of the pipe connection screw sleeve is provided with a pipeline installation thread, the right inner wall of the joint body is provided with a seat bracket groove, the left water diversion seat is installed in the seat bracket groove, and the right end of the left water diversion seat corresponding to the end position of the guide radial plate is provided with a guide plate groove, and each guide radial plate at the left end of the water divider is installed on the left water diversion seat through the guide plate groove. An internal groove with a joint internal thread is provided on the right inner wall of the seat bracket groove. The joint body is fixedly installed on the left end of the filter housing through the joint internal thread, and the right end of the left water diversion seat is pressed against the left end of the frame ring flange of the filter screen cylinder. The structure of the right joint is exactly the same as that of the left joint.

[0014] The present application has a reasonable and compact structure and is easy to use. The water divider installed in the filter screen cylinder can effectively increase the flow rate of water near the filter screen. By opening the pipe or valve connected to the right joint, the inner wall of the filter screen cylinder can be flushed and cleaned, which can avoid clogging of the mesh, prevent the formation of filter cakes, increase the filtration area, effectively improve the filtration capacity, and significantly improve the filtration efficiency. The filtration is not affected during sewage discharge and uninterrupted water supply can be achieved. It has the characteristics of good filtration effect, can significantly reduce energy consumption, save energy, and is easy and quick to disassemble and assemble, easy to clean, and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific structure of this application is given by the following drawings and embodiments:

[0016] Figure 1 is a schematic diagram of a front half-section structure of Example 1 of the present application;

[0017] Figure 2 Yes Figure 1 A schematic diagram of the cross-sectional enlarged structure at AA in the middle;

[0018] Figure 3 This is a schematic diagram of the working state of Example 1 of the present application;

[0019] Figure 4 It is a schematic diagram of the main view partial cross-section structure of Example 2 of the present application.

[0020] Legend: 1 is the filter screen cylinder, 2 is the left water distribution seat, 3 is the right water distribution seat, 4 is the variable diameter core, 5 is the guide radial plate, 6 is the screen frame, 7 is the frame ring flange, 8 is the cylinder frame lining ring, 9 is the protective net layer, 10 is the joint body, 11 is the screen sleeve, 12 is the pipe connection screw sleeve, 13 is the external groove, 14 is the pipeline installation thread, 15 is the seat bracket, 16 is the guide plate groove, 17 is the internal groove, 18 is the sleeve boss, 19 is the limit clamp ring, 20 is the annular boss, 21 is the limit ring platform, 22 is the water inlet pipe, 23 is the sand settling tank, 24 is the filter tank, 25 is the water inlet valve, 26 is the sewage cleaning valve, 27 is the sewage cleaning pipe, 28 is the sewage discharge hose, 29 is the filter housing, 30 is the water supply port, 31 is the trash rack, 32 is the pressure water pump, and 33 is the water outlet pipe. DETAILED DESCRIPTION

[0021] The present application is not limited by the following embodiments, and the specific implementation method can be determined according to the technical solution of the present application and actual conditions.

[0022] Example 1: Figure 1As shown in FIG. 3 , the micro-pressure filtration device before the pump comprises a filter screen cartridge 1, a left joint, a right joint, a left water separation seat 2, a right water separation seat 3 and a water separator. The filter screen cartridge 1 is a horizontal cylindrical cylinder with its axis arranged horizontally. A left joint capable of being connected to a left water inlet pipeline is fixed to the left end of the filter screen cartridge 1, a right joint capable of being connected to a right sewage discharge pipeline is fixed to the right end of the filter screen cartridge 1, a left water separation seat 2 is fixed to the center of the inner cavity of the left joint or the left end of the filter screen cartridge 1, and a right joint or a right end of the inner cavity of the filter screen cartridge 1 is fixed to the center of the inner cavity of the filter screen cartridge 1. There is a right water separator 3, and the water separator is installed in the filter screen cylinder 1 through the left water separator 2 and the right water separator 3. The water separator includes a variable diameter core 4 and a guide radial plate 5. The variable diameter core 4 has a large outer diameter in the middle and a small outer diameter at the left and right ends. No less than three guide radial plates 5 are fixed on the outer side of the variable diameter core 4. Each guide radial plate 5 is evenly arranged along the outer circumference of the variable diameter core 4. The outer edge of the guide radial plate 5 is close to the inner wall of the filter screen cylinder 1. The left and right ends of the guide radial plate 5 extend to the left and right ends of the variable diameter core 4 respectively. The left water separator 2, the right water separator 3 and the water separator can be connected together in a detachable manner or fixed together. The guide radial plate 5 can be fixed on the outer side of the variable diameter core 4 by existing known methods such as screw connection, welding, bonding or inlaying. The guide radial plate 5 and the variable diameter core 4 can also be made into an integrated type by molding, injection molding, etc. using known corrosion-resistant and high-strength materials such as engineering plastics or resins, nylon composite materials, etc. The present application installs a water divider in the filter screen cylinder 1, which can change the flow state of water. A filter chamber is formed between the outer side of the variable diameter core 4 and the filter screen cylinder 1. When water containing impurities enters the filter chamber from the left joint, the water flows out from the mesh holes on the side wall of the filter screen cylinder 1 to the outside of the filter screen cylinder 1 to achieve water supply filtration, and impurities such as mud and sand adhere to the inner wall of the filter screen cylinder 1. The water divider can effectively increase the flow rate of water near the filter screen cylinder 1, thereby avoiding mesh blockage, preventing filter cake formation, and increasing the filtration area, effectively improving the filtration capacity, and significantly improving the filtration efficiency. When the impurities attached to the inner wall of the filter screen cylinder 1 When there are a lot of impurities and dirt, the pipe or valve connected to the right joint can be opened to allow the water in the filter screen cylinder 1 to flow out from the right joint, so as to flush and clean the inner wall of the filter screen cylinder 1. At the same time, part of the water outside the filter screen cylinder 1 flows back into the inner cavity of the filter screen cylinder 1 by pressure difference, forcing the dirt attached to the inner wall of the filter screen cylinder 1 to fall off, so as to clean the filter screen cylinder 1 and discharge the sewage. The filtration is not affected during the sewage discharge, and uninterrupted normal water supply can be achieved during the cleaning. While reducing energy consumption, the filtration efficiency is improved, the filtration cycle is extended, and only a small amount of water and a lower water pressure are required for cleaning. The present application has a simple and reasonable structure, is easy to use, can achieve natural filtration without relying on pressurization, has good filtering effect, can significantly reduce energy consumption, save energy, is convenient and quick to disassemble and assemble, is easy to clean, and is easy to operate.

[0023] like Figure 1As shown in FIG. 2 , the filter screen cylinder 1 includes a screen cylinder frame 6 and a filter body. The left and right ends of the cylindrical screen cylinder frame 6 are respectively fixed with a cylinder frame lining ring 8 with a frame ring flange 7. The filter body is fixed to the outside of the screen cylinder frame 6. The filter body includes a filter screen layer and a protective screen layer 9. The inner side of the protective screen layer 9 is fixed to the outer side of the screen cylinder frame 6. The outer side of the protective screen layer 9 is fixed with a filter screen layer. In actual manufacturing, it is best to make the protective screen layer 9 a hard stainless steel filter screen. The protective screen layer 9 can effectively protect the filter screen layer and extend its service life. The filter screen layer and the protective screen layer 9 are preferably installed together by an existing detachable connection method such as a buckle. When the filter screen layer is contaminated or damaged, it can be reused by replacing only the filter screen layer, which is more economical and environmentally friendly.

[0024] like Figure 1 As shown in FIG. 2 , the middle part of the variable diameter core 4 of the water divider is cylindrical, and the projection of the outer surface of the end of the variable diameter core 4 on the vertical plane is an elliptical arc or a parabola or an isosceles trapezoid or an isosceles triangle. The end of the variable diameter core 4 can be semi-elliptical or a parabolic arc or a truncated cone or a cone, and the shapes of the left end and the right end can be the same or different.

[0025] According to actual needs, the guide radial plate 5 of the water divider is a flat plate or a spiral arc plate. The guide radial plate 5 is a flat plate, which is easy to manufacture, and the guide radial plate 5 is a spiral arc plate, which can further increase the filtration cycle of the filtration device and achieve better filtration effect.

[0026] like Figure 1As shown in FIG. 2, the left joint includes a joint body 10, a mesh tube ferrule 11 and a pipe connection screw sleeve 12. An external groove 13 with a joint external thread is provided on the left outer side surface of the joint body 10. The pipe connection screw sleeve 12 is fixedly installed in the external groove 13 through the joint external thread. A pipeline installation thread 14 is provided on the inner wall of the pipe connection screw sleeve 12. A seat bracket 15 is provided on the right inner wall of the joint body 10. The left water diversion seat 2 is installed in the seat bracket 15. A guide plate groove 16 is provided at the right end of the left water diversion seat 2 corresponding to the end position of the guide radial plate 5. Each guide radial plate 5 at the left end of the water container is installed on the left water diversion seat 2 through the guide plate groove 16. The inner wall of the right part of the seat bracket 15 is provided with an internal groove 17 with a joint internal thread. The net tube ferrule 11 is fixedly installed in the internal groove 17 through the joint internal thread. The right inner wall of the net tube ferrule 11 is provided with a ferrule boss 18. The left part of the cylinder frame liner ring 8 at the left end of the filter net tube 1 is installed with a limiting ferrule 19. The ferrule boss 18 of the net tube ferrule 11 is pressed against the frame ring flange 7 through the limiting ferrule 19. The structure of the right joint is exactly the same as that of the left joint. The filter net tube 1 is fixed by the frame ring flange 7, the limiting ferrule 19 and the net tube ferrule 11. The net tube ferrule 11 is twisted from the left end or the right end and pushed to the middle of the filter net tube 1. After removing the corresponding limiting ferrule 19, the filter net tube 1 can be removed and its rapid replacement can be realized, so that the filter net tube 1 with different mesh sizes and different specifications can be replaced according to actual needs, which is more convenient and quick to use. In addition, a high-pressure nozzle may be provided on the outside of the filter screen cartridge 1. When the water inside the filter screen cartridge 1 cannot clean it, flushing with the high-pressure nozzle can quickly restore the cleanliness of the filter screen cartridge 1.

[0027] like Figure 1 As shown in FIG. 2 , an annular boss 20 is provided at the right end of the left water diversion seat 2 corresponding to the end position of the cartridge frame liner ring 8. The right end of the annular boss 20 is pressed against the end face of the cartridge frame liner ring 8 and keeps a seal. A limiting ring platform 21 is provided on the right inner wall of the limiting snap ring 19. The left end of the limiting ring platform 21 is pressed against the right end face of the frame ring flange 7. The left end of the limiting snap ring 19 presses against the right end of the left water diversion seat 2. The guide plate groove 16 can realize the positioning of the guide radial plate 5. The water diverter is fixedly installed on the left water diversion seat 2 and the right water diversion seat 3 through the guide radial plate 5. The positioning is simple and accurate, and the disassembly and assembly are convenient and quick. The cross section of the limiting snap ring 19 is L-shaped. The cartridge frame liner ring 8 can be locked through the limiting ring platform 21. The annular boss 20 can ensure that the left water diversion seat 2 and the cartridge frame liner ring 8 are sealed at the butt end face.

[0028] like Figure 3As shown, the left joint is connected to the grit chamber 23 through the water inlet pipe 22, the filter tank 24 is provided outside the filter screen cylinder 1, the left joint and the right joint are located in the filter tank 24, the water inlet pipe 22 is provided with a water inlet valve 25, the inner cavity of the filter screen cylinder 1 is connected to the lower part of the grit chamber 23 through the water inlet valve 25 and the water inlet pipe 22, the right joint is connected to the sewage cleaning pipe 27 with a sewage cleaning valve 26, the right end of the sewage cleaning pipe 27 is connected to the sewage discharge hose 28, and the inner cavity of the filter screen cylinder 1 can be connected to the sewage discharge hose 28 through the sewage cleaning valve 26 and the sewage cleaning pipe 27. According to actual needs, the grit chamber 23 and the filter tank 24 can be a pool body built of masonry structure or brick-concrete structure, or a pool body prefabricated with concrete, or a pool body welded by steel plates, or a pool body made by existing known methods such as pressing, injection molding, welding, etc. of materials such as engineering plastics; in addition, a pool body array group with multiple side-by-side grit chambers 23 or filter tanks 24 can also be made according to needs for use. The sewage hose 28 can be connected to the sewage tank, which is more convenient to use, or the sewage can be concentrated and discharged to a space or a designated area where sewage can be stored. The present application is used for filtration, and the head loss is small, which saves energy; the surface water enters the strip or trapezoidal sedimentation tank 23 from the water diversion channel for sedimentation, and the water flow in the sedimentation tank 23 enters the filter screen cylinder 1 through the water inlet pipe 22 for filtration, and the water flow in the water inlet pipe 22 is filtered and flushed by the small head of the water flow in the water inlet pipe 22, which can effectively save energy consumption, and the filter is set at the outlet of the sedimentation tank 23. The size and scale of the sedimentation tank 23 can be reduced, which is conducive to saving land resources and reducing the cost of the micro-irrigation system. During use, farmers do not need to frequently maintain it, and long-term water supply can be met, which makes up for the shortcomings of the existing pre-pump and post-pump filters, and has the characteristics of high filtration efficiency, small footprint, low investment and operation costs, safe use, simple maintenance, and green environmental protection, which can reduce the cost of the micro-irrigation system and improve filtration efficiency.

[0029] According to actual needs, the water inlet valve 25 and the cleaning valve 26 are electromagnetic valves or electric valves, and a liquid level sensor is provided on the upper inner wall of the sand settling tank 23. The wiring terminals of the water inlet valve 25 and the cleaning valve 26 are electrically connected to the controller, and the signal output terminal of the liquid level sensor is electrically connected to the signal input terminal of the controller. The installation height of the liquid level sensor in the sand settling tank 2 is determined according to needs. When the actual liquid level in the sand settling tank 23 is lower than the liquid level sensor, the liquid level sensor has no signal transmitted to the controller, and the controller opens the water inlet valve 25 through the control circuit. The application works normally to achieve filtration. When the actual liquid level in the sand settling tank 23 is higher than the liquid level sensor, it means that the filter cylinder 1 is blocked, and the liquid level sensor outputs a signal and transmits it to the controller. The controller opens the cleaning valve 26 through the control circuit. The application realizes the cleaning of the dirt inside the filter cylinder 1 without stopping the filtration. In this way, the water inlet valve 25 and the cleaning valve 26 are automatically controlled by the controller.

[0030] The working process of Example 1 of the present application is as follows: Figure 3 As shown, a grit chamber 23 is provided in advance and the irrigation water to be filtered is stored. The irrigation water first passes through the grit chamber 23 to settle the larger sediment particles. The inlet of the water inlet pipe 22 is located in the grit chamber 23 and is provided with a trash rack 31. It is best to make the pressure head of the irrigation water to be filtered in the water inlet pipe 22 be 0.2 to 2 meters. A filter tank 24 separated from the grit chamber 23 is provided. The present application is provided at the lower part of the filter tank 24 and the water inlet pipe 22 and the cleaning pipe 27 are connected through the left and right joints. The water inlet valve 25 is located on the water inlet pipe 22 between the grit chamber 23 and the filter tank 24, and is provided for easy climbing. The steps of the industry make the cleaning valve 26 located on the cleaning pipe 27 outside the filter tank 24, so that the working environment of the water inlet valve 25 and the cleaning valve 26 is relatively dry, which is convenient for operation, maintenance and replacement. A pressure water pump 32 is provided at the lower part or bottom of the filter tank 24. The pressure water pump 32 can be connected to the pipeline system of water-saving irrigation through an outlet pipe 33 to realize water supply. A sewage outlet is provided at the lower part of the filter tank 24 corresponding to the right end of the cleaning pipe 27. The right end of the cleaning pipe 27 extends to the outside of the filter tank 24 through the sewage outlet and is installed with a sewage hose 28. A sewage tank is provided at the end of the sewage hose 28. When filtering, first, the controller opens the water inlet valve 25 and keeps the cleaning valve 26 closed, and at the same time, the pressure water pump 32 is started. After the irrigation water to be filtered in the grit chamber 23 passes through the trash rack 31, it enters the filter screen cylinder 1 through the water inlet pipe 22, 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 32 sends the filtered clean water into the pipeline system through the outlet pipe 33, and is transported to the field by pressurization or self-pressure. After the filtering device has been working for a period of time, if the filter screen cylinder 1 is blocked to a certain extent, the filtering efficiency will be seriously reduced. The water level in the filter cylinder 1 drops, and sewage needs to be discharged to restore the filtering performance of the filter. By opening the sewage cleaning valve 26, sewage is discharged under the action of natural water head. The dirt adhering to the filter screen is flushed into the sewage tank by the water in the filter cylinder 1 through the sewage cleaning pipe 27 and the sewage discharge hose 28. After the sewage flushing is completed, the sewage cleaning valve 26 is closed, and the filter enters the next filtering cycle. During the sewage discharge process, the filter cylinder 1 can filter uninterruptedly and can discharge sewage while filtering. In this way, while continuously filtering the irrigation water, sewage cleaning operations can be carried out as needed, thereby significantly improving the filtration efficiency while reducing energy consumption.

[0031] Example 2: Figure 4As shown, a filter housing 29 is installed on the outside of the filter screen cartridge 1, and a filter cleaning cavity surrounding the filter screen cartridge 1 is arranged inside the filter housing 29. A left joint is installed on the left part of the filter housing 29, and a right joint is installed on the right part of the filter housing 29. The filter screen cartridge 1 isolates the inner cavities of the left joint and the right joint from the filter cleaning cavity. A water supply port 30 is arranged at the lower part of the filter housing 29, and the inner cavity of the water supply port 30 is connected with the filter cleaning cavity. The left joint includes a joint body 10 and a pipe connection screw sleeve 12. An external groove 13 with a joint external thread is arranged on the outer side surface of the left part of the joint body 10, and the pipe connection screw sleeve 12 is fixedly installed in the external groove 13 through the joint external thread. Inside, the inner wall of the pipe connection screw sleeve 12 is provided with a pipeline installation thread 14, the right inner wall of the joint body 10 is provided with a seat bracket 15, the left water diversion seat 2 is installed in the seat bracket 15, and the right end of the left water diversion seat 2 corresponding to the end position of the guide radial plate 5 is provided with a guide plate groove 16, and each guide radial plate 5 at the left end of the water divider is installed on the left water diversion seat 2 through the guide plate groove 16. The inner wall of the right part of the seat bracket 15 is provided with an internal groove 17 with a joint internal thread. The joint body 10 is fixedly mounted on the left end of the filter housing 29 through the joint internal thread. The right end of the left water diversion seat 2 is pressed against the left end of the frame ring flange 7 of the filter screen cylinder 1, and the structure of the right joint is exactly the same as that of the left joint. By installing the filter housing 29 outside the filter screen cylinder 1, the present application can be made into a small product. The grit chamber 23 is not set at the water supply in front of the filter screen cylinder 1. The water source directly enters the present application for filtration, and flows out from the water supply port 30 to achieve agricultural irrigation purposes such as drip irrigation and sprinkler irrigation. It can meet the needs of farmers and is relatively convenient to install and use. As needed, a pipe connection screw sleeve 12 can be set on the water supply port 30 to connect the external water supply pipeline more conveniently. In actual use, it is only necessary to connect the input irrigation water source to be filtered through the water inlet pipe through the left joint, connect the sewage hose or sewage tank through the sewage cleaning pipe with a sewage cleaning valve through the right joint, and connect the water supply port 30 to the water outlet pipe. The filtered clean water can be sent to the pipeline system through the water outlet pipe and transported to the field by pressurization or self-pressure.

[0032] 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.

Claims

1. A pre-pump micro-pressure filtration device, characterized in that: The utility model comprises a filter screen cylinder, a left joint, a right joint, a left water separation seat, a right water separation seat and a water separator. The filter screen cylinder is a horizontal cylindrical cylinder with its axis arranged horizontally. A left joint which can be connected to the left water inlet pipeline is fixed on the left end of the filter screen cylinder, and a right joint which can be connected to the right sewage discharge pipeline is fixed on the right end of the filter screen cylinder. A left water separation seat is fixed at the center of the inner cavity of the left joint or the left end of the filter screen cylinder, and a right water separation seat is fixed at the center of the inner cavity of the right joint or the right end of the filter screen cylinder. The water separator is installed in the filter screen cylinder through the left water separation seat and the right water separation seat. The water separator comprises a variable diameter core body and a guide radial plate. The middle part of the variable diameter core body has a large outer diameter and the left and right two parts are fixed. The outer diameter of the end is small, and no less than three guide radial plates are fixed on the outer side of the variable diameter core body, and each guide radial plate is evenly arranged along the outer circumference of the variable diameter core body, and the outer edge of the guide radial plate is close to the inner wall of the filter screen cylinder, and the left and right ends of the guide radial plate extend to the left and right ends of the variable diameter core body respectively; the left joint includes a joint body, a screen cylinder ferrule and a pipe connection screw sleeve, and an external groove with a joint external thread is provided on the outer side surface of the left part of the joint body, and the pipe connection screw sleeve is fixedly installed in the external groove through the joint external thread, and a pipeline installation thread is provided on the inner wall of the pipe connection screw sleeve, and a seat bracket is provided on the right inner wall of the joint body, and the left water distribution seat is installed in the seat bracket. A guide plate groove is provided at the right end of the left water diversion seat at the end position of the guide radial plate, and each guide radial plate at the left end of the water diverter is installed on the left water diversion seat through the guide plate groove. An internal groove with a joint internal thread is provided on the right inner wall of the seat bracket, and the net tube ferrule is fixedly installed in the internal groove through the joint internal thread. A ferrule boss is provided on the right inner wall of the net tube ferrule, and a limiting clamp ring is installed on the left part of the cylinder frame liner ring at the left end of the filter net tube. The ferrule boss of the net tube ferrule is pressed against the frame ring flange through the limiting clamp ring, and the structure of the right joint is exactly the same as that of the left joint; an annular boss is provided at the right end of the left water diversion seat corresponding to the end position of the cylinder frame liner ring, and the right end of the annular boss It is pressed against the end face of the cylinder frame liner ring and keeps sealing. A limiting ring platform is provided on the right inner wall of the limiting clamp. The left end of the limiting ring platform is pressed against the right end face of the frame ring flange. The left end of the limiting clamp presses the right end of the left water distribution seat. The left joint is connected to the sand settling tank through an inlet pipe. A filter tank is provided on the outside of the filter cylinder. The left joint and the right joint are located in the filter tank. An inlet valve is provided on the inlet pipe. The inner cavity of the filter cylinder is connected to the lower part of the sand settling tank through the inlet valve and the inlet pipe. The right joint is connected to a cleaning pipe with a cleaning valve. A sewage discharge hose is connected to the right end of the cleaning pipe. The inner cavity of the filter cylinder can be connected to the sewage discharge hose through the cleaning valve and the cleaning pipe.

2. The pre-pump micro-pressure filtration device according to claim 1, characterized in that: The filter screen cylinder includes a screen cylinder frame and a filter body. The left and right ends of the cylindrical screen cylinder frame are respectively fixed with a screen frame lining ring with a frame ring flange. The filter screen body is fixed to the outside of the screen cylinder frame. The filter screen body includes a filter screen layer and a protective screen layer. The inner side of the protective screen layer is fixed to the outer side of the screen cylinder frame, and the filter screen layer is fixed to the outer side of the protective screen layer.

3. The pre-pump micro-pressure filtration device according to claim 1, characterized in that: The middle part of the reducer core of the water divider is cylindrical, and the projection of the outer surface of the end of the reducer core on the vertical plane is an elliptical arc or a parabola or an isosceles trapezoid or an isosceles triangle; or / and, the guide radial plate of the water divider is a flat plate or a spiral arc plate.

4. The pre-pump micro-pressure filtration device according to claim 1, characterized in that: The water inlet valve and the sewage cleaning valve are solenoid valves or electric valves. A liquid level sensor is provided on the upper inner wall of the sand settling tank. The wiring terminals of the water inlet valve and the sewage cleaning valve are electrically connected to the controller. The signal output terminal of the liquid level sensor is electrically connected to the signal input terminal of the controller.

5. The pre-pump micro-pressure filtration device according to claim 1, 2 or 3, characterized in that: A filter housing is installed outside the filter screen cylinder, and a filter cleaning cavity surrounding the filter screen cylinder is arranged inside the filter housing. A left joint is installed on the left part of the filter housing, and a right joint is installed on the right part of the filter housing. The filter screen cylinder isolates the inner cavity of the left joint and the inner cavity of the right joint from the filter cleaning cavity. A water supply port is arranged at the lower part of the filter housing, and the inner cavity of the water supply port is connected with the filter cleaning cavity. The left joint includes a joint body and a pipe connection screw sleeve. An external groove with a joint external thread is arranged on the outer side surface of the left part of the joint body, and the pipe connection screw sleeve is fixedly installed in the external groove through the joint external thread. , a pipeline installation thread is provided on the inner wall of the pipe connection screw sleeve, a seat bracket is provided on the right inner wall of the joint body, the left water diversion seat is installed in the seat bracket, a guide plate groove is provided at the right end of the left water diversion seat corresponding to the end position of the guide radial plate, and each guide radial plate at the left end of the water divider is installed on the left water diversion seat through the guide plate groove, an internal groove with a joint internal thread is provided on the right inner wall of the seat bracket, the joint body is fixedly installed on the left end of the filter housing through the joint internal thread, the right end of the left water diversion seat is pressed against the left end of the frame ring flange of the filter screen cylinder, and the structure of the right joint is exactly the same as that of the left joint.

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