Multi-sand centrifugal sand-gravel combined backwashing filter

Abstract

The utility model provides a multi-sand centrifugal gravel combined backwashing filter and relates to the technical field of filters. A multi-sand centrifugal gravel combined backwashing filter comprises a desilting tank, a cover plate, a centrifugal filtering tank I, a connecting pipe I and a centrifugal filtering tank II, the cover plate is sleeved on the side portion of the desilting tank, and the desilting tank is connected and communicated with the centrifugal filtering tank I and the centrifugal filtering tank II. By controlling the electric control valve I and the electric control valve II to be opened, the electric control valve III and the electric control valve IV are kept closed, water sequentially passes through the water inlet pipe I, the water receiving pipe and the flow dividing pipe I to enter the desilting tank, silt on one side of the partition plate in the desilting tank is reversely washed, and reverse operation control is conducted on the corresponding electric control valves through the operation. The other side of the partition plate in the desilting tank is flushed, so that the purpose of non-stop flushing is achieved, the centrifugal filtering tank I and the centrifugal filtering tank II can operate independently, silt in water is filtered continuously, and irrigation continuity is guaranteed.

Description

Technical Field

[0001] The utility model provides a multi-sand centrifugal sand and gravel combined backwashing filter, which relates to the technical field of filters. Background Art

[0002] In water-scarce areas, groundwater is generally exploited to alleviate the problem of water shortage. From the perspective of water conditions, water conservation is the most important and effective measure to alleviate water shortages, and water-saving filtration equipment is an indispensable part of water conservation. The most commonly used are centrifugal filters, sand and gravel filters, and mesh filters.

[0003] At present, conventional filters in the market for well water filters are mainly centrifugal and manual mesh filters, which are popular among market players for their simple structure, simple operation, high filter efficiency and low cost. This filter also has certain disadvantages, and requires regular manual sand removal, especially in sandy well water, which will cause frequent sand removal. When there are too many impurities in the mesh core and the pressure difference cannot be reduced by sewage discharge, the machine needs to be shut down, the mesh core needs to be removed for manual cleaning, and then installed in the equipment and restarted. Especially in the case of a lot of sand, if sand removal is not timely, it may cause the mesh to be blocked, which will reduce the continuity and efficiency of irrigation.

[0004] Therefore, it is necessary to provide a multi-sand centrifugal sand-gravel combination backwash filter that maintains irrigation continuity during sand discharge. Utility Model Content

[0005] In order to overcome the shortcomings of existing well water filters that require regular shutdown for manual sand discharge, the mesh core must be removed for manual cleaning and then installed into the equipment for restarting, which greatly reduces the efficiency of irrigation continuity, the utility model provides a multi-sand centrifugal sand and gravel combination backwash filter that maintains irrigation continuity during sand discharge.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides the following technical scheme: a multi-sand centrifugal sand and gravel combined backwash filter, comprising a sand settling tank, a cover plate, a push assembly, a centrifugal filter tank I, a water inlet pipe I, a check valve, a connecting pipe I, a centrifugal filter tank II and a sand and gravel filtering structure, the side of the sand settling tank is sleeved with a cover plate, the sand settling tank is provided with a push assembly for controlling the opening and closing of the cover plate, the sand settling tank is connected and communicated with centrifugal filter tank I and centrifugal filter tank II, the centrifugal filter tank I is connected and communicated with a water inlet pipe I, a check valve is installed on the water inlet pipe I, the centrifugal filter tank I and the centrifugal filter tank II are commonly connected and communicated with a connecting pipe I, and the output end of the centrifugal filter tank II is connected with a sand and gravel filtering structure, characterized in that: it also includes: Partition, water connecting pipe, diversion pipe I, diversion pipe II, electric control valve I, electric control valve II, electric control valve III, three-way pipe, electric control valve IV, electric control valve V, flow control component and control component, a partition is fixedly connected in the sand settling tank, diversion pipe I and diversion pipe II are connected and communicated with the sand settling tank, the water inlet pipe I is connected and communicated with the water connecting pipe, the water connecting pipe, diversion pipe I and diversion pipe II are jointly sleeved and communicated with a three-way pipe, electric control valve I is installed on the water connecting pipe, electric control valve II is installed on the diversion pipe I, electric control valve III is installed on the diversion pipe II, electric control valve IV is installed on the centrifugal filter tank I, electric control valve V is installed on the centrifugal filter tank II, the water inlet pipe I is provided with a flow control component, and the centrifugal filter tank II is provided with a control component for controlling each electric control valve.

[0007] As a further preferred scheme, the sand and gravel filtration structure includes a connecting pipe II, a diverter water tank, a connecting pipe III, a sand and gravel filter tank, a connecting pipe IV and a combined water tank. The centrifugal filter tank II is connected and connected to the diverter water tank via a connecting pipe II, an exhaust valve is sleeved on the connecting pipe II, a pressure gauge is installed on the connecting pipe II, two connecting pipes III are connected and connected to the diverter water tank, both connecting pipes III are connected to the sand and gravel filter tanks, and both sand and gravel filter tanks are connected to the combined water tank via a connecting pipe IV.

[0008] As a further preferred embodiment, the flow control component includes a flow control tube I connected and communicated between the water inlet pipe I and the connecting pipe I, a manual valve I is installed on the flow control tube I, a manual valve II and a manual valve III are installed on the connecting pipe I, a flow control tube II is connected and communicated between the connecting pipe I and the connecting pipe II, a manual valve IV is installed on the flow control tube II, and a manual valve V is installed on the connecting pipe II.

[0009] As a further preferred solution, the control assembly includes a control box installed on the centrifugal filter tank II, a protective door is rotatably provided on the control box, and a handle is installed on the protective door.

[0010] As a further preferred solution, the pushing assembly includes two limit plates installed on the sand settling tank, and the two limit plates are commonly clamped with a clamping plate, and the clamping plate is threadedly provided with a threaded clamping rod I for pushing the cover plate.

[0011] As a further preferred solution, it also includes a drainage pipe connected to and communicated with the combined water tank, a ball valve is rotatably provided on the drainage pipe, a U-shaped pipe is connected to and communicated with the sand settling tank, a fertilizer port is provided on one side of the U-shaped pipe, both ends of the U-shaped pipe are respectively connected to both sides of the partition, and two electric control valves VI are provided on the U-shaped pipe.

[0012] As a further preferred scheme, it also includes a filter installed in the sand and gravel filter tank, a filter screen is embedded on the filter, a plurality of guide rods are fixedly connected in the filter, filter plates are slidably arranged on the plurality of guide rods, a top cover is provided on the upper cover of the sand and gravel filter tank, a sealing ring is provided on the edge of the top cover, limit frames are installed on both sides of the sand and gravel filter tank, a sliding plate is commonly penetrated on the two limit frames, and two threaded clamping rods II are threadedly arranged on the sliding plate.

[0013] As a further preferred solution, it also includes a support ring installed at the bottom of the filter, a servo motor is installed on the support ring, the output shaft of the servo motor is fixedly connected to a screw rod through a coupling, the screw rod is threadedly connected to the filter plate, and a drain valve pipe is connected and communicated with the sand and gravel filter tank.

[0014] As a further preferred solution, the handle is provided with an anti-slip cover.

[0015] As a further preferred solution, an observation panel is embedded in the sand and gravel filter tank.

[0016] Compared with the prior art, the filter provided by the embodiment of the utility model has the following advantages: 1. By controlling the electric control valve I and the electric control valve II to open, the electric control valve III and the electric control valve IV are kept closed, so that water enters the sand settling tank through the water inlet pipe I, the water connecting pipe and the diversion pipe I in sequence, and the sediment on one side of the partition in the sand settling tank is reversely flushed. Through the above operation, the corresponding electric control valve is reversely controlled to flush the other side of the partition in the sand settling tank, thereby achieving the purpose of non-stop flushing, so that the centrifugal filter tank I and the centrifugal filter tank II can operate independently, continuously filter the sediment in the water, and ensure the continuity of irrigation.

[0017] 2. Expel the excess air in connecting pipe II through the exhaust valve, measure the water pressure through the pressure gauge, and adjust the water supply pressure in time to avoid pipe explosion or insufficient filtration due to excessive water pressure, so as to protect the pipeline.

[0018] 3. By closing the electronic valve I on the sand and gravel filter tank, opening the electronic valve II, and opening the drain valve pipe, a pressure difference is formed between the two sand and gravel filter tanks, and water flows back to the sand and gravel filter tank, thereby backwashing the filter screen, and cooperating with the screw rod to drive the filter plate to slide up and down to scrape off the sand and gravel, and the sand and gravel filter tank on the other side continues to work, thereby achieving the purpose of backwashing the sand and gravel filter tank, which can maintain the continuity of irrigation and filtration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the sand settling tank, the diversion water tank and the confluence water tank of the utility model.

[0021] Figure 3 It is a three-dimensional cross-sectional structural schematic diagram of the sand settling tank, partition and U-shaped tube of the utility model.

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the shunt pipe I, shunt pipe II and three-way pipe of the utility model.

[0023] Figure 5 The utility model is a three-dimensional cross-sectional structural schematic diagram of a sand and gravel filter tank, a filter and a filter screen.

[0024] Figure 6 It is a three-dimensional cross-sectional structural schematic diagram of the top cover, the limiting frame and the sliding plate of the utility model.

[0025] Figure 7 It is a three-dimensional cross-sectional structural schematic diagram of the sealing ring, water inlet pipe II and electronic valve III of the utility model.

[0026] Figure 8 It is a three-dimensional cross-sectional structural schematic diagram of the guide rod, filter plate and screw rod of the utility model.

[0027] Fig. 9 It is a three-dimensional cross-sectional structural schematic diagram of the support ring, servo motor and screw rod of the utility model.

[0028] Names of the numbers in the figure: 1-sand settling tank, 101-partition plate, 102-water pipe, 103-diverter pipe Ⅰ, 104-diverter pipe Ⅱ, 105-electric control valve Ⅰ, 106-electric control valve Ⅱ, 107-electric control valve Ⅲ, 108-three-way pipe, 109-flow control pipe Ⅰ, 110-manual valve Ⅰ, 111-manual valve Ⅱ, 112-manual valve Ⅲ, 113-flow control pipe Ⅱ, 114-manual valve Ⅳ, 115-manual valve Ⅴ, 2-cover plate, 3-limiting plate, 4-card plate, 5-threaded clamp rod Ⅰ, 6-centrifugal filter tank Ⅰ, 60-electric control valve Ⅳ, 7-water inlet pipe Ⅰ, 8-check valve, 9-connecting pipe Ⅰ, 10-centrifugal filter tank Ⅱ, 1001-electric control valve Ⅴ, 11-connecting pipe Ⅱ, 1 2-exhaust valve, 13-pressure gauge, 14-diverter water tank, 15-connecting pipe III, 16-electronic valve I, 17-sand filter tank, 18-guide rod, 1801-fertilizer port, 19-filter, 20-filter screen, 21-filter plate, 22-top cover, 23-limiting frame, 24-sliding plate, 25-threaded clamp rod II, 26-connecting pipe IV, 27-electronic valve II, 28-combining water tank, 29-drain pipe, 30-ball valve, 31-U-type pipe, 32-electric control valve VI, 33-control box, 34-protective door, 35-handle, 36-anti-slip sleeve, 37-observation plate, 38-sealing ring, 39-support ring, 40-servo motor, 41-screw, 42-drain valve pipe. DETAILED DESCRIPTION

[0029] The technical solution is further described below in conjunction with specific embodiments. It should be noted that the words indicating directions such as up, down, left, and right mentioned in this article are only for the position of the structure shown in the corresponding drawings. The serial numbers of the parts in this article, such as first, second, etc., are only used to distinguish the objects described and do not have any order or technical meaning. The words such as connection and coupling in this application include direct and indirect connection (coupling) unless otherwise specified.

[0030] Example 1: Multi-sand centrifugal sand and gravel combination backwash filter, see Figure 1-Figure 4As shown, it includes a sand settling tank 1, a cover plate 2, a push assembly, a centrifugal filter tank I6, a water inlet pipe I7, a check valve 8, a connecting pipe I9, a centrifugal filter tank II10, a connecting pipe II11, a diversion water tank 14, a connecting pipe III15, a sand filter tank 17, a connecting pipe IV26 and a confluence water tank 28. The side of the sand settling tank 1 is sleeved with a cover plate 2, and the sand settling tank 1 is provided with a push assembly for controlling the opening and closing of the cover plate 2. The top of the sand settling tank 1 is connected by welding and is connected to the centrifugal filter tank I6 and the centrifugal filter tank II10 for sedimentation and filtration of sediment. The centrifugal filter tank I6 and the centrifugal filter tank II10 are connected by welding. The filter tank Ⅰ6 is connected and communicated with a water inlet pipe Ⅰ7, and a check valve 8 is installed on the water inlet pipe Ⅰ7. The centrifugal filter tank Ⅰ6 and the centrifugal filter tank Ⅱ10 are commonly connected and communicated with a connecting pipe Ⅰ9. The centrifugal filter tank Ⅱ10 is connected and communicated with a connecting pipe Ⅱ11 to the diversion water tank 14. The diversion water tank 14 is connected and communicated with two connecting pipes Ⅲ15. The two connecting pipes Ⅲ15 are both connected with a sand and gravel filter tank 17 for secondary separation of sand and gravel impurities. The two sand and gravel filter tanks 17 are both connected to the combined water tank 28 and communicated with a connecting pipe Ⅳ26. It also includes a partition 101, a water receiving pipe 102, a diverter pipe I 103, a diverter pipe II 104, an electric control valve I 105, an electric control valve II 106, an electric control valve III 107, a three-way pipe 108, an electric control valve IV 60, an electric control valve V 1001, a flow control component and a control component. The partition 101 is fixedly connected to the sand settling tank 1 by welding. The diverter pipe I 103 and the diverter pipe II 104 are connected and communicated with the sand settling tank 1. The diverter pipe I 103 and the diverter pipe II 104 are respectively located on both sides of the partition 101. The water inlet pipe I 7 is connected and communicated with the water receiving pipe. 102, the water receiving pipe 102, the diversion pipe I 103 and the diversion pipe II 104 are sleeved together and connected with a three-way pipe 108, the water receiving pipe 102 is installed with an electric control valve I 105, the diversion pipe I 103 is installed with an electric control valve II 106, the diversion pipe II 104 is installed with an electric control valve III 107, the lower part of the centrifugal filter tank I 6 is installed with an electric control valve IV 60, the lower part of the centrifugal filter tank II 10 is installed with an electric control valve V 1001, the water inlet pipe I 7 is provided with a flow control component, and the centrifugal filter tank II 10 is provided with a control component for controlling each electric control valve.

[0031] See also Figure 4 As shown, the flow control assembly includes a flow control tube Ⅰ109 connected and communicated between the water inlet pipe Ⅰ7 and the connecting pipe Ⅰ9, a manual valve Ⅰ110 is installed on the flow control tube Ⅰ109, a manual valve Ⅱ111 and a manual valve Ⅲ112 are installed on the connecting pipe Ⅰ9, a flow control tube Ⅱ113 is connected and communicated between the connecting pipe Ⅰ9 and the connecting pipe Ⅱ11, a manual valve Ⅳ114 is installed on the flow control tube Ⅱ113, and a manual valve Ⅴ115 is installed on the connecting pipe Ⅱ11.

[0032] See also Figure 4As shown, the control assembly includes a control box 33 installed on the centrifugal filter tank II 10, a protective door 34 is rotatably provided on the control box 33, and a handle 35 is installed on the protective door 34.

[0033] See also Figure 1 As shown, the pushing assembly includes two limit plates 3 installed on the sand settling tank 1, and the two limit plates 3 are commonly clamped with a clamping plate 4, and the clamping plate 4 is threadedly provided with a threaded clamping rod Ⅰ5 for pushing the cover plate 2.

[0034] See also Figure 3 and Figure 5 As shown, it also includes a drainage pipe 29 connected to and communicated with the combined water tank 28, and a ball valve 30 is rotatably provided on the drainage pipe 29. A U-shaped tube 31 is connected to and communicated with the sand settling tank 1. A fertilizer port 1801 is provided on one side of the U-shaped tube. The fertilizer port 1801 is used to add liquid fertilizer. Both ends of the U-shaped tube 31 are respectively connected to both sides of the partition 101, and two electric control valves VI 32 are provided on the U-shaped tube 31.

[0035] When water filtration is required, the check valve 8 is opened and water is introduced into the centrifugal filter tank Ⅰ6 through the water inlet pipe Ⅰ7. The water is precipitated and filtered through the centrifugal filter tank Ⅰ6. Then the water enters the centrifugal filter tank Ⅱ10 through the connecting pipe Ⅰ9 for secondary precipitation. The sand and stone impurities in the centrifugal filter tank Ⅰ6 and the centrifugal filter tank Ⅱ10 are all precipitated into the sand settling tank 1. Then the water enters the diversion water tank 14 through the connecting pipe Ⅱ11. The diversion water tank 14 diverts the water to two sand and stone filter tanks 17 through two connecting pipes Ⅲ15. The sand and gravel are filtered through the filter 19, the filter screen 20 and the filter plate 21, and then the water in the two sand and gravel filter tanks 17 is merged into the combined water tank 28 through the connecting pipe IV26; when only the centrifugal filter tank I6 is needed, the check valve 8, the manual valve II111 and the manual valve IV114 are opened, and the manual valve I110, the manual valve III112 and the manual valve V115 are kept closed, and the water is filtered and flows through the water inlet pipe I7, the centrifugal filter tank I6, the connecting pipe I9, the flow control pipe II113 and the connecting pipe II11 in turn. When only the centrifugal filter tank Ⅱ10 is used, the check valve 8, manual valve Ⅱ111 and manual valve Ⅳ114 are kept closed by opening the manual valve Ⅰ110, manual valve Ⅲ112 and manual valve Ⅴ115, and the water flow is filtered only through the centrifugal filter tank Ⅱ10; when there is a lot of sediment in the water, the centrifugal filter tank Ⅰ6 and the centrifugal filter tank Ⅱ10 need to be used at the same time. At this time, the check valve 8, manual valve Ⅱ111, manual valve Ⅲ112 and manual valve Ⅴ115 are kept open, and the manual valve Ⅰ110 and manual valve Ⅳ114 are closed. When the water is closed, the water flows into the centrifugal filter tank I6 through the water inlet pipe I7, then enters the centrifugal filter tank II10 through the connecting pipe I9, and then is discharged through the connecting pipe II11, and the sediment in the water is filtered in turn by the centrifugal filter tank I6 and the centrifugal filter tank II10; when it is necessary to inspect the sedimentation tank 1, the threaded clamping rod I5 is rotated to move the threaded clamping rod I5 along the clamping plate 4 to the side away from the cover plate 2, so that the threaded clamping rod I5 is separated from the cover plate 2, and then the cover plate 2 can be removed from the sedimentation tank 1 to inspect the sedimentation tank 1;When the sediment in the sedimentation tank 1 needs to be removed, the electric control valve I105 and the electric control valve II106 are opened by operating the control box 33, and the electric control valve III107 and the electric control valve IV60 are kept closed. At this time, water enters the sedimentation tank 1 through the water inlet pipe I7, the water receiving pipe 102 and the diversion pipe I103 in sequence, and the sediment on one side of the partition 101 in the sedimentation tank 1 is reversely flushed. The sewage and sediment are discharged from the U-shaped pipe 31 by opening the electric control valve VI32 on the corresponding side, and then the electric control valve II106 and the electric control valve V1001 are controlled to be closed, so that the electric control valve III107 and the electric control valve IV 60 is opened, at this time, water enters the diversion pipe II 104 from the water receiving pipe 102, and enters the other side of the partition 101 in the sedimentation tank 1 to wash the internal sediment. At this time, the electric control valve VI 32 on the corresponding side is controlled to open, so that the sewage and sediment are discharged from the U-shaped pipe 31. The centrifugal filter tank I6 and the centrifugal filter tank II 10 can operate independently to continuously filter the sediment in the water to ensure the continuity of irrigation; the filtered water in the centrifugal filter tank I6 and the centrifugal filter tank II 10 flows into the combined water tank 28 through the connecting pipe IV 26, and the ball valve 30 is turned to open so that the water can be discharged through the drain pipe 29. ;

[0036] Example 2: Based on Example 1, refer to Figure 2 As shown, it also includes an exhaust valve 12 sleeved on the connecting pipe II 11, and a pressure gauge 13 is installed on the connecting pipe II 11.

[0037] When water flows in the connecting pipe II 11, the excess stuck balls in the connecting pipe II 11 are discharged outward through the exhaust valve 12, and the water pressure is measured by the pressure gauge 13 to adjust the water delivery pressure in time to avoid pipe explosion or insufficient filtration due to excessive water pressure.

[0038] See also Figure 5-Figure 9 As shown, it also includes a filter 19 installed in the sand and gravel filter tank 17, a filter screen 20 is embedded on the filter 19, a plurality of guide rods 18 are fixedly connected in the filter 19, a filter plate 21 is slidably arranged on the plurality of guide rods 18, a top cover 22 is arranged on the upper cover of the sand and gravel filter tank 17, limiting frames 23 are installed on both sides of the sand and gravel filter tank 17, a sliding plate 24 is commonly penetrated on the two limiting frames 23, and two threaded clamping rods II 25 are threadedly arranged on the sliding plate 24; it also includes a support ring 39 installed at the bottom of the filter 19, a servo motor 40 is installed on the support ring 39, the output shaft of the servo motor 40 is fixedly connected with a screw rod 41 through a coupling, the screw rod 41 is threadedly connected to the filter plate 21, and a sewage valve pipe 42 is connected and communicated with the sand and gravel filter tank 17.

[0039] When the gravel filter tank 17 needs to be backwashed, the backwashing is carried out in an open-and-closed manner without stopping the machine. First, the electronic valve I16 on the connecting pipe III15 connected to one of the gravel filter tanks 17 is closed, and the corresponding drain valve pipe 42 is opened. At this time, the other gravel filter tank 17 maintains a normal filtering operation state. The water in the combined water tank 28 flows out from the drain pipe 29, and a part of the water flows back from the connecting pipe IV26 into the filter screen 20 in the gravel filter tank 17 that needs to be backwashed. The pressure difference in the tank body washes away the debris attached to the outer wall of the filter screen 20. At the same time, the filter plate 21 scrapes off the stubborn gravel remaining on the filter screen 20, and the fallen debris flows out from the corresponding drain valve pipe 42 with the water flow to complete the backwashing work. In this way, the gravel filter tank 17 is repeatedly backwashed alternately to maintain the continuity of irrigation and the filtration efficiency.

[0040] See also Figure 4-Figure 6 As shown, an anti-slip sleeve 36 is sleeved on the pull handle 35; an observation plate 37 is embedded in the sand and gravel filter tank 17; and a sealing ring 38 is sleeved on the edge of the top cover 22.

[0041] When holding the handle 35 to rotate the protective door 34, the anti-slip sleeve 36 increases the friction between the human hand and the handle 35 to prevent the hand from slipping; the accumulation of sand and gravel impurities in the sand and gravel filter tank 17 can be observed through the observation plate 37, so that the sand and gravel filter tank 17 can be cleaned in time; the sealing ring 38 seals the connection between the top cover 22 and the sand and gravel filter tank 17 to prevent water from leaking from the gap between the top cover 22 and the sand and gravel filter tank 17 when backwashing the sand and gravel filter tank 17.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. Multi-sand centrifugal sand and gravel combined backwash filter, characterized by: The invention comprises a sand settling tank (1), a cover plate (2), a push assembly, a centrifugal filter tank I (6), a water inlet pipe I (7), a check valve (8), a connecting pipe I (9), a centrifugal filter tank II (10) and a sand and gravel filtering structure. The cover plate (2) is sleeved on the side of the sand settling tank (1). The sand settling tank (1) is provided with a push assembly for controlling the opening and closing of the cover plate (2). The centrifugal filter tank I (6) and the centrifugal filter tank II (10) are connected and communicated with the sand settling tank (1). The centrifugal filter tank I (6) is connected to the push assembly. The centrifugal filter tank I (6) and the centrifugal filter tank II (10) are connected to each other and are connected to a connecting pipe I (9). The output end of the centrifugal filter tank II (10) is connected to a sand and gravel filtering structure. The centrifugal filter tank I (6) and the centrifugal filter tank II (10) are connected to each other and are connected to a water inlet pipe I (7). A check valve (8) is installed on the water inlet pipe I (7). The centrifugal filter tank I (6) and the centrifugal filter tank II (10) are connected to each other and are connected to a connecting pipe I (9). The output end of the centrifugal filter tank II (10) is connected to a sand and gravel filtering structure. The centrifugal filter tank I (10) and the centrifugal filter tank II (10) are also provided. The centrifugal filter tank I (10) and the centrifugal filter tank II (10) are provided with a partition plate (101), a water receiving pipe (102), a flow dividing pipe I (103), a flow dividing pipe II (104), an electric control valve I (105), an electric control valve II (106), an electric control valve III (107 ), a three-way pipe (108), an electric control valve IV (60), an electric control valve V (1001), a flow control component and a control component; a partition plate (101) is fixedly connected in the sand settling tank (1); a diverter pipe I (103) and a diverter pipe II (104) are connected and communicated with the sand settling tank (1); a water inlet pipe I (7) is connected and communicated with a water receiving pipe (102); the water receiving pipe (102), the diverter pipe I (103) and the diverter pipe II (104) are sleeved together and communicated with a three-way pipe (108) An electric control valve I (105) is installed on the water receiving pipe (102), an electric control valve II (106) is installed on the diversion pipe I (103), an electric control valve III (107) is installed on the diversion pipe II (104), an electric control valve IV (60) is installed on the centrifugal filter tank I (6), an electric control valve V (1001) is installed on the centrifugal filter tank II (10), a flow control component is provided on the water inlet pipe I (7), and a control component for controlling each electric control valve is provided on the centrifugal filter tank II (10).

2. The multi-sand centrifugal sand and gravel combined backwash filter according to claim 1, characterized in that: The sand and gravel filtering structure comprises a connecting pipe II (11), a diverting water tank (14), a connecting pipe III (15), a sand and gravel filtering tank (17), a connecting pipe IV (26) and a converging water tank (28). The centrifugal filtering tank II (10) is connected to the diverting water tank (14) and is communicated with the connecting pipe II (11). An exhaust valve (12) is sleeved on the connecting pipe II (11). A pressure gauge (13) is installed on the connecting pipe II (11). Two connecting pipes III (15) are connected to the diverting water tank (14) and are communicated with each other. The two connecting pipes III (15) are both connected to the sand and gravel filtering tank (17). The two sand and gravel filtering tanks (17) are both connected to the converging water tank (28) and are communicated with the connecting pipe IV (26).

3. The multi-sand centrifugal sand and gravel combined backwash filter according to claim 1, characterized in that: The flow control assembly comprises a flow control pipe I (109) connected and communicated between a water inlet pipe I (7) and a connecting pipe I (9), a manual valve I (110) being installed on the flow control pipe I (109), a manual valve II (111) and a manual valve III (112) being installed on the connecting pipe I (9), a flow control pipe II (113) being connected and communicated between the connecting pipe I (9) and the connecting pipe II (11), a manual valve IV (114) being installed on the flow control pipe II (113), and a manual valve V (115) being installed on the connecting pipe II (11).

4. The multi-sand centrifugal sand and gravel combined backwash filter according to claim 1, characterized in that: The control assembly comprises a control box (33) mounted on the centrifugal filter tank II (10), a protective door (34) is rotatably arranged on the control box (33), and a handle (35) is installed on the protective door (34).

5. The multi-sand centrifugal sand and gravel combined backwash filter according to claim 1, characterized in that: The push assembly comprises two limit plates (3) mounted on the sand settling tank (1), a clamping plate (4) being clamped together on the two limit plates (3), and a threaded clamping rod I (5) for pushing the cover plate (2) is threadedly arranged on the clamping plate (4).

6. The multi-sand centrifugal sand and gravel combined backwash filter according to claim 1, characterized in that: The invention also comprises a drainage pipe (29) connected to and in communication with the combined water tank (28), a ball valve (30) being rotatably arranged on the drainage pipe (29), a U-shaped pipe (31) being connected to and in communication with the sand settling tank (1), a fertilizer application port (1801) being arranged on one side of the U-shaped pipe (31), two ends of the U-shaped pipe (31) being respectively in communication with two sides of the partition (101), and two electric control valves VI (32) being arranged on the U-shaped pipe (31).

7. The multi-sand centrifugal sand and gravel combined backwash filter according to claim 2, characterized in that: The invention also comprises a filter (19) installed in the sand and gravel filter tank (17), a filter screen (20) being embedded in the filter (19), a plurality of guide rods (18) being fixedly connected in the filter (19), a filter plate (21) being slidably arranged on the plurality of guide rods (18), a top cover (22) being arranged on the upper cover of the sand and gravel filter tank (17), a sealing ring (38) being sleeved on the edge of the top cover (22), limiting frames (23) being arranged on both sides of the sand and gravel filter tank (17), a sliding plate (24) being passed through the two limiting frames (23), and two threaded clamping rods II (25) being threadedly arranged on the sliding plate (24).

8. The multi-sand centrifugal sand and gravel combined backwash filter according to claim 7, characterized in that: The invention also comprises a support ring (39) installed at the bottom of the filter (19), a servo motor (40) is installed on the support ring (39), an output shaft of the servo motor (40) is fixedly connected to a screw rod (41) through a coupling, the screw rod (41) is threadedly connected to the filter plate (21), and a sewage valve pipe (42) is connected and communicated with the sand and gravel filter tank (17).

9. The multi-sand centrifugal sand and gravel combined backwash filter according to claim 4, characterized in that: The pull handle (35) is sleeved with an anti-slip sleeve (36).

10. The multi-sand centrifugal sand and gravel combined backwash filter according to claim 2, characterized in that: An observation panel (37) is embedded in the sand and gravel filter tank (17).

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