阅读说明：本技术 一种工况自适应回流自堵式无控自吸泵 (Working condition self-adaptive backflow self-blocking type uncontrolled self-priming pump ) 是由 不公告发明人 于 2020-06-02 设计创作，主要内容包括：本发明涉及水泵技术领域,具体是工况自适应回流自堵式无控自吸泵,包括泵机和叶轮箱,所述叶轮箱的进液端设有进液管和进液支管,所述进液管中自进液方向依次设有滤板和滤砂笼,所述进液管上还设有将所述滤板进液侧的堵料排出的排废管；本发明在进液管的一侧位于滤板的进液侧设有排废管,当进液管中的滤板被堵住后,浮动板由于没有流体流动了会发生运动,进而带动支管阀打开使进液支管进液,而进液支管中的流动液体会带动排废管中的绞龙转动,对滤板一侧聚集的堵料进行排出,从而进液管又导通,流体带动浮动板到达平衡状态,使支管阀关闭,实现不破坏和碎化纤维、带、草等异物,并进行排出,保证输出的水质好有利于浇灌使用。(The invention relates to the technical field of water pumps, in particular to a working condition self-adaptive backflow self-blocking type uncontrolled self-priming pump, which comprises a pump and an impeller box, wherein a liquid inlet pipe and a liquid inlet branch pipe are arranged at the liquid inlet end of the impeller box, a filter plate and a sand filtering cage are sequentially arranged in the liquid inlet pipe from the liquid inlet direction, and a waste discharge pipe for discharging blocking materials at the liquid inlet side of the filter plate is also arranged on the liquid inlet pipe; the invention arranges a waste discharge pipe at one side of the liquid inlet pipe at the liquid inlet side of the filter plate, when the filter plate in the liquid inlet pipe is blocked, the floating plate can move because no fluid flows, and further drives the branch pipe valve to open to feed liquid into the liquid inlet branch pipe, and the flowing fluid in the liquid inlet branch pipe can drive the auger in the waste discharge pipe to rotate to discharge the blockage accumulated at one side of the filter plate, so that the liquid inlet pipe is communicated, the floating plate is driven by the fluid to reach a balanced state, the branch pipe valve is closed, the fiber, belt, grass and other foreign matters are not damaged and crushed, and the discharged water quality is ensured to be good, and the irrigation use is facilitated.)

1. The utility model provides a operating mode self-adaptation backward flow is from stifled formula uncontrolled self priming pump which characterized in that: comprises a pump (1) and an impeller box (11), a liquid inlet pipe (2) and a liquid inlet branch pipe (3) are arranged at the liquid inlet end of the impeller box (11), a filter plate (21) and a sand filtering cage (7) are sequentially arranged in the liquid inlet pipe (2) from the liquid inlet direction, the liquid inlet pipe (2) is also provided with a waste discharge pipe (4) for discharging the blocking material at the liquid inlet side of the filter plate (21), the liquid inlet branch pipe (3) is connected with the liquid inlet pipe (2) through a branch pipe valve (5), the branch pipe valve (5) is positioned on one side of the waste discharge pipe (4) far away from the filter plate (21) in the liquid inlet pipe (2), a floating plate (22) floating along with the flowing of fluid is arranged on the liquid discharge side of the filter plate (21), a floating plate linkage component (6) which floats along with the floating plate (22) and controls the opening and closing of the branch pipe valve (5) is arranged on the outer side of the liquid inlet pipe (2);

the waste discharge pipe (4) comprises a circular pipe, a waste discharge packing auger (41), a rotating shaft (42) and a flow wheel (43), the circular pipe is connected to the liquid inlet pipe (2), the waste discharge packing auger (41) is rotatably connected to the circular pipe, the flow wheel (43) is positioned in the liquid inlet branch pipe (3), and the waste discharge packing auger (41) is in transmission connection with the rotating shaft (42);

a limiting plate (23) is fixedly arranged on the inner wall of the liquid inlet pipe (2), the floating plate (22) is elastically connected with the limiting plate (23), the floating plate (22) has elasticity towards the liquid inlet side, and a through groove (221) is formed in the floating plate (22);

the inner wall of the liquid inlet pipe (2) is provided with a sliding groove (201) arranged along the length direction of the liquid inlet pipe, the floating plate (22) is connected to the inner wall of the sliding groove (201) in a sliding mode, the floating plate linkage component (6) comprises a sliding block (61), magnetic blocks (62) and an ejector rod (63), the sliding block (61) and the floating plate (22) are respectively provided with the magnetic blocks (62), the two magnetic blocks (62) are mutually attracted, one end of the ejector rod (63) is connected with the sliding block (61), the other end of the ejector rod (63) is in transmission connection with the branch pipe valve (5), and the outer wall of the liquid inlet pipe (2) is provided with a guide rail (202) matched with the sliding block (61);

a reversible valve plate (51) is arranged inside the branch pipe valve (5), a valve rod (52) fixedly connected with the valve plate (51) through a valve plate shaft (521) is arranged outside the branch pipe valve (5), the valve rod (52) is elastically connected with the branch pipe valve (5) through a torsion spring (522), and a stop block (53) used for limiting the valve rod (52) is further arranged on the outer wall of the branch pipe valve (5);

the valve plate (51) is perpendicular to the valve rod (52), the ejector rod (63) abuts against one end, far away from the valve plate shaft (521), of the valve rod (52), and a filter plate (21) is arranged at the liquid inlet end of the branch pipe valve (5);

at least one part of the waste discharge auger (41) is positioned inside the liquid inlet pipe (2) and at one side of the filter plate (21), the axial direction of the flow wheel (43) is vertical to the flowing direction of the fluid in the liquid inlet branch pipe (3), and the liquid inlet branch pipe (3) is provided with a flow wheel surrounding groove (31) for accommodating the flow wheel (43);

filter sand cage (7) including backup pad (72) and sand discharge auger (76), the lower terminal surface of backup pad (72) is equipped with a plurality of solid board (73), arc filter screen (74) and filter screen board (75) that are central symmetric distribution, form between the first end of solid board (73) and filter screen board (75) and enter groove (701), form between the second end of solid board (73) and filter screen board (75) and enter seam (702), arc filter screen (74) respectively rather than both sides form between solid board (73) and the filter screen board (75) sand washing portion (704), sand discharge auger (76) are located the below of sand washing portion (704).

2. The operating condition adaptive backflow self-blocking type uncontrolled self-priming pump of claim 1, characterized in that: an arc-shaped shielding plate (721) is fixed on the outer edge of the supporting plate (72), a sand filtering rotating shaft (722) rotatably connected with the liquid inlet pipe (2) is arranged at the middle position of the supporting plate (72), the filter screen plate (75) is elastically hinged with the supporting plate (72) through a filter screen plate rotating shaft (751), and a limiting stopper shaft (723) is arranged on the other side of the filter screen plate (75).

3. The operating condition adaptive backflow self-blocking type uncontrolled self-priming pump of claim 1, characterized in that: the lower part of the sand discharge auger (76) is provided with a gear transmission device (77) in transmission connection with the sand filtering rotating shaft (722), and the lower part of the sand filtering cage (7) is also provided with a sealing cover (71) in sealing connection with the liquid inlet pipe (2).

Technical Field

The invention relates to the technical field of water pumps, in particular to a working condition self-adaptive backflow self-blocking type uncontrolled self-priming pump.

Background

The self-priming pump belongs to a self-priming centrifugal pump and has the advantages of compact structure, convenient operation, stable operation, easy maintenance, high efficiency, long service life, stronger self-priming capability and the like. The pipeline does not need to be provided with a bottom valve, and only quantitative liquid guiding is required to be ensured to be stored in the pump body before work. Different liquids can adopt self-sucking pumps made of different materials; the self-priming pump has the working principle that before the water pump is started, the pump shell is filled with water (or the water is stored in the pump shell). After the impeller is started, the impeller rotates at a high speed to enable water in the impeller channel to flow to the volute, at the moment, the inlet forms vacuum, the water inlet check valve is opened, and air in the suction pipe enters the pump and reaches the outer edge through the impeller channel.

The existing self-priming pump is generally provided with a smashing device at an impeller structure or other positions in order to prevent blockage, but impurities after smashing still can exist in water and are discharged along a drain pipe, so that the quality of the drained water is poor, and when the self-priming pump sucks water in a field ditch to irrigate crops, the water quality easily causes blockage of a thinner spray pipe, so that sprinkling irrigation cannot be carried out.

Disclosure of Invention

The invention aims to provide a working condition self-adaptive backflow self-blocking type uncontrolled self-priming pump to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: operating mode self-adaptation backward flow is from stifled formula uncontrolled self priming pump, including pump machine and impeller box, the feed liquor end of impeller box is equipped with feed liquor pipe and feed liquor branch pipe, be equipped with filter plate and sand filtering cage in proper order from the feed liquor direction in the feed liquor pipe, still be equipped with on the feed liquor pipe with the putty exhaust of filter plate feed liquor side arranges the waste pipe, the feed liquor branch pipe with connect through the branch pipe valve between the feed liquor pipe, the branch pipe valve is located arrange the waste pipe and keep away from in the feed liquor pipe one side of filter plate, the flowing back side of filter plate is equipped with along with the unsteady board of fluid flow, the outside of feed liquor pipe is equipped with along with unsteady board floats and controls the unsteady board linkage part of branch pipe valve switching.

Preferably, the pipe of wasting discharge includes pipe, the auger of wasting discharge, pivot and flow wheel, the pipe is connected on the feed liquor pipe, the auger of wasting discharge rotates to be connected in the pipe, just the flow wheel is located in the feed liquor branch pipe, the auger of wasting discharge with pass through between the pivot transmission is connected.

Preferably, at least one part of the waste discharge auger is positioned in the liquid inlet pipe and positioned on one side of the filter plate, the axial direction of the flow wheel is vertical to the flowing direction of the fluid in the liquid inlet branch pipe, and the liquid inlet branch pipe is provided with a flow wheel surrounding groove for accommodating the flow wheel.

Preferably, the inner wall of the liquid inlet pipe is fixedly provided with a limiting plate, the floating plate is elastically connected with the limiting plate, the floating plate has elasticity measured towards the liquid inlet, and the floating plate is provided with a through groove.

Preferably, the inner wall of the liquid inlet pipe is provided with a sliding groove arranged along the length direction of the liquid inlet pipe, the floating plate is connected to the inner wall of the sliding groove in a sliding mode, the floating plate linkage component comprises a sliding block, magnetic blocks and an ejector rod, the sliding block and the floating plate are respectively provided with the magnetic blocks, the two magnetic blocks attract each other, one end of the ejector rod is connected with the sliding block, the other end of the ejector rod is in transmission connection with the branch pipe valve, and the outer wall of the liquid inlet pipe is provided with a guide rail matched with the sliding block.

Preferably, a reversible valve plate is arranged inside the branch pipe valve, a valve rod fixedly connected with the valve plate through a valve plate shaft is arranged outside the branch pipe valve, the valve rod is elastically connected with the branch pipe valve through a torsion spring, and a stop block used for limiting the valve rod is further arranged on the outer wall of the branch pipe valve.

Preferably, the valve plate with the valve rod is arranged perpendicularly, the ejector pin supports and leans on the valve rod is kept away from the one end of valve plate axle, the feed liquor end of a branch pipe valve is equipped with the filter plate.

Preferably, the sand filtering cage includes backup pad and sand discharge auger, the lower terminal surface of backup pad is equipped with a plurality of solid slab, arc filter screen and the filter screen board that is central symmetric distribution, form the entering groove between the first end of solid slab and filter screen board, form the entering seam between the second end of solid slab and filter screen board, the arc filter screen respectively with its both sides form the portion of washing sand between solid slab and the filter screen board, the sand discharge auger is located the below of portion of washing sand.

Preferably, an arc-shaped shielding plate is fixed on the outer edge of the supporting plate, a sand filtering rotating shaft which is rotatably connected with the liquid inlet pipe is arranged at the middle position of the supporting plate, the filter screen plate is elastically hinged with the supporting plate through the filter screen plate rotating shaft, and a limiting blocking shaft is arranged on the other side of the filter screen plate.

Preferably, a gear transmission device in transmission connection with the sand filtering rotating shaft is arranged below the sand discharge auger, and a sealing cover in sealing connection with the liquid inlet pipe is further arranged below the sand filtering cage.

Compared with the prior art, the invention has the beneficial effects that:

the invention arranges a waste discharge pipe at one side of the liquid inlet pipe at the liquid inlet side of the filter plate, when the filter plate in the liquid inlet pipe is blocked, the floating plate moves because no fluid flows, and further drives the branch pipe valve to open to feed liquid into the liquid inlet branch pipe, and the flowing liquid in the liquid inlet branch pipe drives the auger in the waste discharge pipe to rotate to discharge the blockage accumulated at one side of the filter plate, so that the liquid inlet pipe is communicated, the floating plate is driven by the fluid to reach a balanced state, the branch pipe valve is closed, the fiber, belt, grass and other foreign matters are not damaged and crushed, and the blockage is discharged, the quality of the output water is ensured to be good, the irrigation use is facilitated, and the whole process of discharging after blockage is automatically controlled without manual control.

Drawings

FIG. 1 is a schematic structural view of a self-adaptive backflow self-blocking type uncontrolled self-priming pump under working conditions according to the present invention;

FIG. 2 is a schematic view of the construction of the manifold valve of the present invention;

FIG. 3 is a schematic view of the flow wheel of the present invention;

FIG. 4 is a schematic view of the floating plate according to the present invention;

FIG. 5 is a schematic structural view of a sand trap according to the present invention;

FIG. 6 is a schematic top view of the sand trap of the present invention.

Reference numbers in the figures: 1. a pump machine; 11. an impeller case; 2. a liquid inlet pipe; 201. a chute; 202. a guide rail; 21. filtering the plate; 22. a floating plate; 221. passing through the slot; 23. a limiting plate; 3. a liquid inlet branch pipe; 31. the flow wheel surrounds the slot; 4. a waste discharge pipe; 41. a waste discharge auger; 42. a rotating shaft; 43. a flow wheel; 5. a branch valve; 51. a valve plate; 52. a valve stem; 521. a valve plate shaft; 522. a torsion spring; 53. a stopper; 6. a floating plate linkage member; 61. a slider; 62. a magnetic block; 63. a top rod; 7. a sand filtering cage; 701. entering a groove; 702. entering the seam; 703. a sand discharge groove; 704. a sand washing part; 71. a sealing cover; 72. a support plate; 721. an arc-shaped shielding plate; 722. a sand filtering rotating shaft; 723. a limit gear shaft; 73. a solid plate; 74. an arc-shaped filter screen; 75. a filter screen plate; 751. a filter screen plate rotating shaft; 76. a sand discharge auger; 77. a gear transmission device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): as shown in fig. 1 to 6, the working condition self-adaptive backflow self-blocking type uncontrolled self-priming pump comprises a pump 1 and an impeller case 11, wherein a liquid inlet pipe 2 and a liquid inlet branch pipe 3 are arranged at a liquid inlet end of the impeller case 11, a filter plate 21 and a sand filtering cage 7 are sequentially arranged in the liquid inlet pipe 2 from a liquid inlet direction, a waste discharge pipe 4 for discharging blocking materials on a liquid inlet side of the filter plate 21 is further arranged on the liquid inlet pipe 2, the liquid inlet branch pipe 3 is connected with the liquid inlet pipe 2 through a branch pipe valve 5, the branch pipe valve 5 is positioned in the waste discharge pipe 4 and is far away from the filter plate 21, a floating plate 22 floating along with fluid flow is arranged on a liquid discharge side of the filter plate 21, and a floating plate linkage component 6 floating along with the floating plate 22 to control the opening; after the pump 1 rotates, the impeller rotates in the impeller box 11, negative pressure is generated after water in the impeller box 11 is thrown out, attraction is generated at the liquid inlet pipe 2 and the liquid inlet branch pipe 3, most of the water enters from the liquid inlet pipe 2 quickly, the floating plate 22 moves backwards for a certain distance by the flowing of the water, the branch pipe valve 5 is closed, the impurities in the water, such as flakes, strips or blocks, are blocked when reaching the front of the filter plate 21, when the blocked impurities become more and more gradually, the flow in the liquid inlet pipe 2 is reduced, the flow speed is slowed down, at the moment, the floating plate 22 rebounds after no fluid pressure exists, the branch pipe valve 5 is opened through the floating plate linkage part 6, after the branch pipe valve 5 is opened, the water flow enters the liquid inlet branch pipe 3 quickly, impacts the flow wheel 43 in the liquid inlet branch pipe 3 to rotate the waste discharge auger 41, and then the waste discharge auger 41 is driven to rotate, so that the blocked materials before the waste discharge filter plate 21 are conveyed to the outside of the waste discharge pipe 4 by the waste discharge auger, after cleaning, the filter plate 21 is communicated again, the floating plate 22 moves backwards, the branch pipe valve 5 is closed, and the former state is achieved, so that the water in the output pipe cannot contain crushed impurities, and the water quality is relatively good.

Specifically, the waste discharge pipe 4 comprises a circular pipe, a waste discharge auger 41, a rotating shaft 42 and a flow wheel 43, the circular pipe is connected to the liquid inlet pipe 2, the waste discharge auger 41 is rotatably connected to the circular pipe, the flow wheel 43 is positioned in the liquid inlet branch pipe 3, and the waste discharge auger 41 is in transmission connection with the rotating shaft 42; the flow wheel 43 rotates when being impacted by the fluid flowing through the liquid inlet branch pipe 3, so the rotary shaft 42 drives the waste discharge auger 41 to rotate in the circular pipe, the waste discharge auger 41 discharges the blocked materials at the front end of the filter plate 21 outwards, and the discharge is relatively thorough because negative pressure is generated during discharge.

Specifically, at least one part of the waste discharge auger 41 is positioned inside the liquid inlet pipe 2 and at one side of the filter plate 21, and the design can ensure that the waste discharge auger 41 can better convey the blocking materials in front of the filter plate 21 and in the liquid inlet pipe 2 outwards; the axial direction of the flow wheel 43 is perpendicular to the flowing direction of the fluid in the liquid inlet branch pipe 3, and the liquid inlet branch pipe 3 is provided with the flow wheel surrounding groove 31 for accommodating the flow wheel 43, as shown in fig. 3, the rotating direction of the flow wheel 43 can be enabled to face to one direction, and the water only washes the upper half part of the flow wheel 43.

Specifically, a limiting plate 23 is fixedly arranged on the inner wall of the liquid inlet pipe 2, the floating plate 22 is elastically connected with the limiting plate 23, the floating plate 22 has elastic force towards the liquid inlet side, and a through groove 221 is arranged on the floating plate 22; the floating plate 22 generates resistance to fluid by passing through the portion outside the groove 221, so that pressure is generated when water flows through the floating plate 22, and a spring is provided between the floating plate 22 and the stopper plate 23 to balance the pressure received, and when the pressure disappears, a reaction force is generated.

Specifically, the inner wall of the liquid inlet pipe 2 is provided with a chute 201 arranged along the length direction of the liquid inlet pipe, the floating plate 22 is connected to the inner wall of the chute 201 in a sliding manner, the floating plate linkage component 6 comprises a sliding block 61, magnetic blocks 62 and an ejector rod 63, the sliding block 61 and the floating plate 22 are both provided with the magnetic blocks 62, the two magnetic blocks 62 attract each other, one end of the ejector rod 63 is connected with the sliding block 61, the other end of the ejector rod 63 is in transmission connection with the branch pipe valve 5, and the outer wall of the liquid inlet pipe 2 is provided with a guide rail 202 matched with; when the floating plate 22 is pressed to move rightwards, the two magnetic blocks 62 attract each other, so the ejector rod 63 moves rightwards along with the floating plate 22, the ejector rod 63 is separated from the valve rod 52, the valve rod 52 enables the valve plate 51 to be closed through the torsion spring 522, when the floating plate 22 is not pressed by water pressure, the floating plate 22 is forced to move leftwards through the spring on the limiting plate 23, and the slide block 61 moves leftwards, so the ejector rod 63 is driven to push the valve rod 52 to rotate, the valve plate 51 is enabled to be opened, and water enters the liquid inlet branch pipe 3.

Specifically, a valve plate 51 which can be turned is arranged inside the branch pipe valve 5, a valve rod 52 fixedly connected with the valve plate 51 through a valve plate shaft 521 is arranged outside the branch pipe valve 5, the valve rod 52 is elastically connected with the branch pipe valve 5 through a torsion spring 522, a stop block 53 used for limiting the valve rod 52 is further arranged on the outer wall of the branch pipe valve 5, the valve plate 51 is perpendicular to the valve rod 52, an ejector rod 63 abuts against one end, far away from the valve plate shaft 521, of the valve rod 52, a filter plate 21 is arranged at the liquid inlet end of the branch pipe valve 5, the valve plate 51 is in a closed state through the elasticity of the torsion spring 522 in a natural state, and the valve plate 51 is turned over and opened only when the ejector rod 63 abuts against the valve.

Specifically, as shown in fig. 5 to 6, the sand filtering cage 7 includes a supporting plate 72 and a sand discharge auger 76, a plurality of solid plates 73, arc-shaped filtering screens 74 and filtering screen plates 75 are arranged on the lower end surface of the supporting plate 72, the solid plates 73, the arc-shaped filtering screens 74 and the filtering screen plates 75 are distributed in a central symmetry manner, an inlet slot 701 is formed between the first ends of the solid plates 73 and the filtering screen plates 75, an inlet slot 702 is formed between the second ends of the solid plates 73 and the filtering screen plates 75, sand washing portions 704 are formed between the arc-shaped filtering screens 74 and the solid plates 73 and the filtering screen plates 75 on both sides of the arc-shaped filtering screens 74, and; when water flows through the sand filtering cage 7, the sand filtering cage 7 on one side impacted by the water flow is rotated because the solid plate 73 is fixed with the supporting plate 72 and the impact force of the water is applied, and in the rotating process, particulate matters or suspended matters in the water enter the entering seam 702 from the entering groove 701, and the filtering screen plate 75 positioned in the water flow direction can rotate according to the impact force of the water, so that a larger gap is opened in the entering seam 702, the filtering screen plate 75 at the water outflow part cannot rotate through the limit of the limit stop shaft 723, the entering seam 702 is small, namely, the larger particulate matters cannot be discharged after entering the sand filtering cage 7, the sand filtering cage 7 can collect gravel, hard small-volume algae and the like, and sludge lumps and the like can flow away along the water flow under the washing of the water and are set into a rotating form, thereby avoiding the deformation caused by the impact of the water on one side for a long time, and the situation that the resistance is increased due to the fact that more sundries are adhered to the arc-shaped filter screen 74 or the sundries cannot sink due to water impact is also prevented, gravel and the like cleaned in the sand washing part 704 enter the sand discharge auger 76 through the sand discharge groove 703 and are discharged by the sand discharge auger 76, and the cleanness of the inside of the sand filtering cage 7 is guaranteed.

Specifically, an arc-shaped shielding plate 721 is fixed on the outer edge of the supporting plate 72, a sand filtering rotating shaft 722 rotatably connected with the liquid inlet pipe 2 is arranged in the middle of the supporting plate 72, the filtering screen plate 75 is elastically hinged with the supporting plate 72 through a filtering screen plate rotating shaft 751, and a limiting blocking shaft 723 is arranged on the other side of the filtering screen plate 75; the arc-shaped shielding plate 721 can expose one side of the sand filtering cage 7 in water flow, and the other part of the sand filtering cage 7 can not be directly impacted by water, so that the sand filtering cage 7 rotates, and part of sundries can not sink due to impact of water, the elastic hinge joint of the filtering screen plate 75 can keep the entering gap 702 small when no water is impacted frontally, so that the sundries can not run out, and the entering gap 702 is large when water is impacted frontally, so that the sundries can enter conveniently.

Specifically, a gear transmission device 77 in transmission connection with the sand filtering rotating shaft 722 is arranged below the sand filtering auger 76, a sealing cover 71 in sealing connection with the liquid inlet pipe 2 is further arranged below the sand filtering cage 7, the sand filtering cage 7 rotates to drive the sand filtering auger 76 to rotate, the transmission ratio between the sand filtering cage 7 and the sand filtering auger 76 is large, the rotation speed of the sand filtering auger 76 is slow, and the gear transmission device 77 can adopt the combination of a bevel gear and a worm gear.

The working principle is as follows: after the pump 1 rotates, the impeller rotates in the impeller case 11, negative pressure is generated after water in the impeller case 11 is thrown out, attraction force is generated at the liquid inlet pipe 2 and the liquid inlet branch pipe 3, most of the water enters from the liquid inlet pipe 2 quickly, when the floating plate 22 is pressed to move rightwards, because the two magnetic blocks 62 attract each other, the ejector rod 63 moves rightwards along with the floating plate 22, the ejector rod 63 is separated from the valve rod 52, the valve rod 52 enables the valve plate 51 to be closed through the torsion spring 522, and the impurities in the water, such as sheets, belts or blocks, and the like reach the front of the filter plate 21 and are blocked, when the blocked impurities become more and more, the flow in the liquid inlet pipe 2 is reduced, the flow rate is slowed, at the moment, when the floating plate 22 is not pressed by water pressure, the floating plate 22 is forced by the spring on the limiting plate 23 to move leftwards, and the slide block 61 moves leftwards, the ejector rod 63 is driven to push the, when the branch pipe valve 5 is opened, water flow rapidly enters the liquid inlet branch pipe 3, the flow wheel 43 in the liquid inlet branch pipe 3 is impacted to rotate, the waste discharge auger 41 is driven to rotate, the waste discharge auger 41 conveys the blocking materials before reaching the filter plate 21 to the outside of the waste discharge pipe 4, after the cleaning is finished, the filter plate 21 is conducted again, the floating plate 22 moves backwards, the branch pipe valve 5 is closed to reach the previous state, so that the crushed impurities cannot be contained in the water in the output pipe, the water quality is relatively good, when the water flow flows through the sand filtering cage 7, the sand filtering cage 7 on one side is impacted by the water flow, as the solid plate 73 is fixed with the support plate 72, the sand filtering cage 7 rotates under the impact force of the water, in the rotating process, particulate matters or suspended matters in the water enter the inlet slot 701 to the inlet slot 702, and the screen plate 75 in the water flow direction can rotate according to the impact force of the water, the large gap is opened at the inlet seam 702, the filter screen plate 75 at the water outflow part cannot rotate through the limit of the limit baffle shaft 723, the inlet seam 702 is small, namely large particles cannot go out after entering the sand filtering cage 7, sand gravel, hard small-volume algae and the like can be collected in the sand filtering cage 7, sludge clusters and the like can flow away along the water flow under the washing of water and are arranged in a rotating mode, deformation caused by the impact of water on the arc-shaped filter screen 74 at one side for a long time can be avoided, resistance is prevented from being increased due to the adhesion of more impurities on the arc-shaped filter screen 74, or the impurities cannot sink due to the impact of water, the sand gravel and the like cleaned in the sand washing part 704 enter the sand discharge auger 76 through the sand discharge groove 703 and are discharged by the sand discharge auger 76, the inside of the sand filtering cage 7 is ensured to be clean, and after the sand gravel and the like in the water are further cleaned through the sand filtering cage 7, the sand gravel and the impeller box cannot be abraded, and the sludge component containing nutrients in water is reserved, so that the nutrients in the field can be increased when the field is watered, and the growth of crops is facilitated.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.