An automatic sand filter

Abstract

The present invention relates to the technical field of sand filters, and specifically relates to an automatic sand filter, which includes an outer housing. An inlet is fixedly installed at the upper end of the outer housing, and a support seat is fixedly installed at the lower end of the outer surface of the outer housing. A packing chamber is provided at the middle position inside the outer housing, and a water distribution mechanism is arranged at the position between the inlet and the packing chamber inside the outer housing. An internal mixing mechanism is arranged inside the packing chamber. Through the setting of the water distribution mechanism, when the flow rate of the water flowing out from the outermost water outlet hole increases, the trigger plate in this water outlet hole rotates under the impact of the water flow, and then through the cooperation between the push rod, the driven push rod, the electromagnet, the battery switch, the driving magnet and the battery, the next water outlet hole is opened. In this way, the number of opened water outlet holes can be automatically controlled according to the water flow rate, so as to ensure that the amount of raw water received for filtration treatment per unit time always remains within a certain numerical range, and improve the filtration efficiency of the raw water.

Description

Technical Field

[0001] The present invention relates to the technical field of sand filters, and specifically to an automatic sand filter. Background Art

[0002] A sand filter is a tool that places some filtering media, such as quartz sand, activated carbon, anthracite, manganese sand and other materials, either in layers or singly in a container, and allows water to flow through the container to reduce the turbidity of the water body and achieve water purification. It is inexpensive and has a high purification efficiency. When in use, the raw water to be treated is discharged into the sand filter from the water inlet pipe. The raw water flows through the filter bed, and the filtered water source is then collected by the water collector and discharged from the sand filter after converging into a stream.

[0003] The existing automatic sand filters have the following disadvantages:

[0004] 1. When the sand filter is in use, the water flow falls from the upper distributor, passes through the filter layer and is then collected and discharged by the water collector. The commonly used distributor has a single-hole structure, that is, the water flow is concentrated at one place and flows downward. When the water volume increases, the water flow rate will decrease, the amount of raw water received for filtration treatment per unit time will decrease, and the overall filtration efficiency of the raw water will decrease;

[0005] 2. The sand filter completes filtration through the internal filter layer. During use, impurities will accumulate at the upper end of the internal filter layer and cause blockage, affecting the filtration effect of the internal filter layer. Subsequently, it is necessary to regularly clean the internal filter layer, which is rather cumbersome and has low work efficiency. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides an automatic sand filter, which is achieved by the following specific technical means.

[0007] An automatic sand filter includes an outer housing. The upper end of the outer housing is fixedly installed with a water inlet, and the lower end of the outer surface of the outer housing is fixedly installed with a support seat. A packing chamber is provided at the middle position inside the outer housing, and a water distribution mechanism is arranged at the position between the water inlet and the packing chamber inside the outer housing. An internal mixing mechanism is arranged inside the packing chamber.

[0008] The internal mixing mechanism includes a motor mounting base, a mixing motor, a connecting rod, a connecting block, a support base, a sealing ring, a mixing rod and a stirring head. An installation groove is formed at the lower end of the outer housing and on the left side of the filling chamber. The motor mounting base is installed in the installation groove. A mixing motor is fixedly installed on the upper surface of the motor mounting base. A connecting rod is arranged at the rear position of the mixing motor on the upper surface of the motor mounting base. The right end of the connecting rod is hinged with a connecting block. The connecting block is slidably connected to the installation groove. The right end of the connecting block is fixedly installed with a support base. A sealing ring is arranged at the connection between the connecting block and the support base. The support base slidably penetrates through the right end of the installation groove and is located in the filling chamber. A mixing rod is fixedly installed on the upper surface of the support base. Stirring heads are fixedly installed on the side surface of the mixing rod.

[0009] Further: A driving disk concentric with the output shaft at the rear end of the mixing motor is fixedly installed. An installation shaft is fixedly installed at a position near the edge on the rear surface of the driving disk. The left end of the connecting rod is rotatably connected to the installation shaft.

[0010] Further: A water distribution chamber is embedded and installed at a position below the water inlet inside the outer housing. The lower end of the water distribution chamber is fixedly connected to the water distribution mechanism. Filter plates are symmetrically and fixedly installed at the upper and lower ends of the filling chamber inside the outer housing. A water outlet is fixedly installed at the middle position of the lower surface of the outer housing. A water collector is fixedly installed at a position above the water outlet inside the outer housing. The water flowing through the filling chamber and filtered enters the water collector and is then discharged from the water outlet.

[0011] Further: The water distribution mechanism includes a water distribution pipe, water outlet holes, a first sealing door, a second sealing door, a return spring, a driving magnet block, a rotating chamber, an electromagnet and a storage battery. The water distribution pipes are installed at the lower end of the water inlet and are evenly arranged along the circumferential direction of the outer housing. The end of the water distribution pipe far from the water inlet is inclined downward. Water outlet holes are formed on the lower surface of the water distribution pipe. A rotating chamber is formed at the lower end of the inner side wall of the water distribution pipe at the position of the water outlet holes. Inside the water distribution pipe, first sealing doors and second sealing doors are slidably installed at the upper ends of the remaining water outlet holes except the outermost water outlet holes. The first sealing door and the second sealing door are clamped with each other. Driving magnet blocks are fixedly connected to the ends of the first sealing door and the second sealing door far from the connection between the two. Return springs sleeved on the driving magnet blocks are fixedly connected to the ends of the first sealing door and the second sealing door far from the connection between the two. An electromagnet is embedded and installed at a position of the water distribution pipe where the return spring is far from the driving magnet block. A storage battery is embedded and installed at a position below the electromagnet inside the water distribution pipe. The electromagnet and the driving magnet block have the same magnetic property.

[0012] Further: A trigger plate is rotatably installed at the position of the rotating chamber inside the water distribution pipe. A spring telescopic rod connected to the inner side wall of the rotating chamber is fixedly installed on the side surface of the trigger plate far from the water outlet hole. A push rod is fixedly installed on the side surface of the trigger plate far from the water outlet hole and below the spring telescopic rod.

[0013] Further: The spring telescopic rod is arc-shaped, and the ejector rod and the spring telescopic rod are bent at the same angle.

[0014] Further: A driven rod corresponding to the position of the ejector rod is slidably connected inside the water distribution pipe. One end of the driven rod away from the water outlet hole is fixedly connected with a connecting contact. A battery switch is embedded and installed inside the water distribution pipe at a position where the connecting contact is away from the driven rod. A sealing sleeve is fixedly installed on the surface of the driven rod.

[0015] Further: A return spring connected to the water distribution pipe is installed at one end of the driven rod away from the ejector rod and below the connecting contact.

[0016] Further: The mixing rods are evenly distributed on the upper surface of the support base, and the stirring heads are evenly distributed on the side surfaces of the mixing rods.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. For this automatic sand filter, through the setting of the water distribution mechanism, when the flow rate and flow volume of the water flowing out from the outermost water outlet hole increase, the trigger plate in this water outlet hole rotates under the impact of the water flow, and then through the cooperation among the ejector rod, the driven ejector rod, the electromagnet, the battery switch, the driving magnet and the battery, the next water outlet hole is opened. In this way, the number of opened water outlet holes can be automatically controlled according to the flow volume of the water flow, so as to ensure that the amount of raw water to be filtered per unit time always remains within a certain numerical range, improve the filtration efficiency of the raw water, and avoid the situation that when the water flow with a large flow volume concentrates at one place and flows downward, the flow rate decreases, resulting in a reduction in the amount of raw water to be filtered per unit time and a decrease in the overall filtration efficiency of the raw water.

[0019] 2. For this automatic sand filter, through the setting of the internal mixing mechanism, the stirrer heads and the mixing rods can stir and mix the fillers inside the filler layer, so that the fillers are in full contact with the raw water, thereby improving the filtration effect. At the same time, the filtered impurities are evenly dispersed instead of concentrating and accumulating at the upper end of the fillers, avoiding the influence of the impurities on the flow of the raw water and reducing the utilization rate of the fillers. Description of the Drawings

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0021] Figure 2 It is a top-view structural schematic diagram of the present invention.

[0022] Figure 3 It is the present invention Figure 2 The cross-sectional view in the A-A direction of.

[0023] Figure 4 It is the present inventionFigure 3 Partial enlarged view of part a.

[0024] Figure 5 For the present invention Figure 3 Cross-sectional view taken along the B-B direction in the present invention.

[0025] Figure 6 For the present invention Figure 5 Partial enlarged view of part b in the present invention.

[0026] Figure 7 Schematic cross-sectional structure diagram of the water distribution mechanism of the present invention.

[0027] Figure 8 For the present invention Figure 7 Partial enlarged view of c in the present invention.

[0028] Figure 9 For the present invention Figure 8 Partial enlarged view of e in the present invention.

[0029] Figure 10 For the present invention Figure 7 Partial enlarged view of d in the present invention.

[0030] Figure 11 Schematic bottom view structure diagram of the water distribution mechanism of the present invention.

[0031] In the figure: 1. Outer cover; 2. Water inlet; 21. Water distribution chamber; 22. Water outlet; 23. Water collector; 3. Support base; 4. Inner mixing mechanism; 41. Motor mounting base; 42. Mixing motor; 421. Driving disc; 422. Mounting shaft; 43. Connecting rod; 44. Connecting block; 45. Support base; 46. Sealing ring; 47. Mixing rod; 48. Stirring head; 5. Water distribution mechanism; 51. Water distribution pipe; 52. Water outlet holes; 53. First sealing door; 54. Second sealing door; 55. Return spring; 56. Driving magnet; 57. Rotating chamber; 571. Trigger plate; 572. Spring telescopic rod; 573. Thumb rod; 574. Driven rod; 575. Connecting contact; 576. Battery switch; 58. Electromagnet; 59. Battery; 6. Filler chamber; 61. Filter plate. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figure 1 , Figure 2 and Figure 3, An automatic sand filter, including an outer housing 1, a water inlet 2 is fixedly installed at the upper end of the outer housing 1, and a support base 3 is fixedly installed at the lower end of the outer surface of the outer housing 1. A packing chamber 6 is provided at the middle position inside the outer housing 1, and a water distribution mechanism 5 is arranged at the position between the water inlet 2 and the packing chamber 6 inside the outer housing 1. An internal mixing mechanism 4 is arranged inside the packing chamber 6. Water flows in from the water inlet 2, then flows out through the water distribution mechanism 5, and then enters the packing chamber 6 for filtration treatment.

[0034] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , The internal mixing mechanism 4 includes a motor mounting base 41, a mixing motor 42, a connecting rod 43, a connecting block 44, a support base 45, a sealing ring 46, a mixing rod 47 and a stirring head 48. An installation groove is provided at the lower end of the outer housing 1 and on the left side of the packing chamber 6. The motor mounting base 41 is installed in the installation groove. A mixing motor 42 is fixedly installed on the upper surface of the motor mounting base 41. A connecting rod 43 is arranged at the rear position of the mixing motor 42 on the upper surface of the motor mounting base 41. The right end of the connecting rod 43 is hinged with a connecting block 44. The connecting block 44 is slidably connected to the installation groove. The right end of the connecting block 44 is fixedly installed with a support base 45, and a sealing ring 46 is arranged at the connection between the connecting block 44 and the support base 45. The support base 45 slidably penetrates through the right end of the installation groove and is located inside the packing chamber 6. The sealing ring 46 maintains the sealing performance of the connection during the sliding of the connecting block 44, preventing water from entering the inside of the packing chamber 6. A mixing rod 47 is fixedly installed on the upper surface of the support base 45. Stirring heads 48 are fixedly installed on the side surface of the mixing rod 47. The mixing rods 47 are evenly distributed on the upper end surface of the support base 45, and the stirring heads 48 are evenly distributed on the side surface of the mixing rod 47. When the support base 45 moves, the stirring heads 48 and the mixing rods 47 stir and mix the packing inside the packing layer 6, enabling the packing to come into full contact with the raw water, thereby improving the filtration effect. At the same time, the filtered impurities are evenly dispersed instead of concentrating and accumulating at the upper end of the packing, avoiding the influence of impurities on the flow of raw water and reducing the utilization rate of the packing.

[0035] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , A driving disk 421 concentric with it is fixedly installed at the rear end of the output shaft of the mixing motor 42. An installation shaft 422 is fixedly installed at a position near the edge of the rear surface of the driving disk 421. The left end of the connecting rod 43 is rotatably connected to the installation shaft 422. When the mixing motor 42 is started, the driving disk 421 rotates, and the installation shaft 422 on its surface rotates. During the rotation, it drives the connecting rod 43 to move. The connecting block 44 makes a horizontal reciprocating slide under the drive of the connecting rod 43, and then drives the support base 45 to move synchronously to push the mixing rod 47 for mixing.

[0036] Please refer to Figure 1 、 Figure 2 and Figure 3 As shown in, a water distribution chamber 21 is embedded and installed at a position below the water inlet 2 inside the outer housing 1. The lower end of the water distribution chamber 21 is fixedly connected to the water distribution mechanism 5. Filter plates 61 are symmetrically and fixedly installed at the upper and lower ends of the packing chamber 6 inside the outer housing 1. A water outlet 22 is fixedly installed at the middle position of the lower surface of the outer housing 1. A water collector 23 is fixedly installed at a position above the water outlet 22 inside the outer housing 1. The water flow filtered by the packing chamber 6 enters the water collector 23 and is then discharged from the water outlet 22.

[0037] Please refer to Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown in, the water distribution mechanism 5 includes a water distribution pipe 51, water outlet holes 52, a first sealing door 53, a second sealing door 54, a return spring 55, a driving magnet 56, a rotating cavity 57, an electromagnet 58 and a storage battery 59. The water distribution pipe 51 is installed at the lower end of the water inlet 2 and is evenly arranged along the circumference of the outer housing 1. The end of the water distribution pipe 51 away from the water inlet 2 is inclined downward. Water outlet holes 52 are formed on the lower surface of the water distribution pipe 51. A rotating cavity 57 is formed at the lower end of the inner side wall of the water distribution pipe 51 at the position of the water outlet holes 52. Inside the water distribution pipe 51, first sealing doors 53 and second sealing doors 54 are respectively and slidably installed at the upper ends of the remaining water outlet holes 52 except the outermost water outlet holes 52. The first sealing door 53 and the second sealing door 54 are engaged with each other. Driving magnets 56 are fixedly connected to the ends of the first sealing door 53 and the second sealing door 54 away from the engagement position of the two. Return springs 55 sleeved on the driving magnets 56 are fixedly connected to the ends of the first sealing door 53 and the second sealing door 54 away from the engagement position of the two. An electromagnet 58 is embedded and installed at a position of the water distribution pipe 51 away from the driving magnet 56 at the end of the return spring 55. A storage battery 59 is embedded and installed at a position below the electromagnet 58 inside the water distribution pipe 51. When the first sealing door 53 and the second sealing door 54 are engaged with each other, the corresponding water outlet holes 52 are in a closed state; the electromagnet 58 and the driving magnet 56 have the same magnetic polarity. When the electromagnet 58 is energized, a repulsive force is generated between the electromagnet 58 and the driving magnet 56, pushing the first sealing door 53 and the second sealing door 54 to close. At this time, the return spring 55 is in the maximum stretched state.

[0038] Please refer to Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11, a water distribution pipe 51 is rotatably installed with a trigger plate 571 at an internal position of a rotating cavity 57. A spring telescopic rod 572 connected to the inner side wall of the rotating cavity 57 is fixedly installed on a surface of the trigger plate 571 away from a water outlet hole 52. A push rod 573 is fixedly installed on the surface of the trigger plate 571 away from the water outlet hole 52 and below the spring telescopic rod 572. When water flows out from the water outlet hole 52, the pressure of the water flow will squeeze the trigger plate 571, causing it to rotate into the rotating cavity 57 and simultaneously squeezing the spring telescopic rod 572, and at the same time driving the push rod 573 to move synchronously.

[0039] When water enters the water distribution pipe 51, in the initial state, except for the outermost water outlet hole 52, the rest of the water outlet holes 52 are all closed, and the water flows out from the outermost water outlet hole 52. When the water volume increases, it will trigger the trigger plate 571 in the outermost water outlet hole 52, thereby driving the corresponding push rod 573 to squeeze the driven rod 574. At this time, the electromagnet 58 inside the water outlet hole 52 close to the outermost water outlet hole 52 is powered off, and the first sealing door 53 and the second sealing door 54 are opened, and the water flows out from this water outlet hole 52. Similarly, when the water flow rate increases, the trigger plate 571 in this water outlet hole 52 rotates, and then the next water outlet hole 52 is opened. That is to say, the water distribution mechanism 5 can automatically control the number of opened water outlet holes 52 according to the water flow rate, so as to ensure that the amount of raw water received for filtration treatment per unit time always remains within a certain value range, and improve the filtration efficiency of the raw water.

[0040] Please refer to Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 , the spring telescopic rod 572 is arc-shaped, and the push rod 573 and the spring telescopic rod 572 are bent at the same angle.

[0041] Please refer to Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 , a driven rod 574 corresponding to the position of the push rod 57 is slidably connected inside the water distribution pipe 51. One end of the driven rod 574 away from the water outlet hole 52 is fixedly connected with a connection contact 575. A battery switch 576 is embedded and installed inside the water distribution pipe 51 at a position away from the driven rod 574 of the connection contact 575. In the initial state, the connection contact 575 does not contact the battery switch 576 (as Figure 10) The storage battery 59 is used to supply power to the electromagnet 58. When the electromagnet 58 is energized, it generates magnetism. In cooperation with the driving magnet block 56, the first sealing door 53 and the second sealing door 54 are clamped together, the water outlet hole 52 is closed. When the ejector rod 573 moves towards the inside of the rotating cavity 57, it will push the driven rod 574 to slide. A sealing sleeve is fixedly installed on the surface of the driven rod 574 to maintain the seal at the connection during sliding and prevent water flow from entering. The driven rod 574 drives the connection contact 575 to move synchronously. The connection contact 575 presses the storage battery switch 576, causing the storage battery 59 to stop supplying power to the electromagnet 58. The electromagnet 58 loses magnetism when de-energized, and the second sealing door 54 and the first sealing door 53 separate under the resilience of the return spring 55, and the water outlet hole 52 is opened.

[0042] Please refer to Figure 7 、 Figure 8 、 Figure 9 and Figure 10 A return spring connected to the water distribution pipe 51 is installed at the end of the driven rod 574 away from the ejector rod 573 and below the connection contact 575. When the driven rod 574 moves towards the storage battery switch 576, it will compress the return spring. When the driven rod 574 loses the thrust, the return spring can drive the driven rod 574 back to its original position.

[0043] Working principle: Water flows in from the water inlet 2, then flows out through the water distribution mechanism 5, and then enters the packing chamber 6 for filtration treatment. The water flow after being filtered by the packing chamber 6 enters the water collector 23 and is then discharged from the water outlet 22.

[0044] When the water flow flows out from the outermost water outlet hole 52, when the water volume increases, it will trigger the trigger plate 571 in the outermost water outlet hole 52, which in turn drives the corresponding push ejector rod 573 to press the driven rod 574. At this time, the electromagnet 58 inside the water outlet hole 52 close to the outermost water outlet hole 52 is de-energized, and the first sealing door 53 and the second sealing door 54 are opened, and the water flow flows out from this water outlet hole 52. Similarly, when the flow rate of the water flow increases, the trigger plate 571 in this water outlet hole 52 rotates, and then the next water outlet hole 52 is opened.

[0045] During filtration, the mixing motor 42 is started, the driving disk 421 rotates, and the mounting shaft 422 on its surface rotates. During the rotation process, it drives the connecting rod 43 to move. The connecting block 44 makes a horizontal reciprocating slide driven by the connecting rod 43, and then drives the support base 45 to move synchronously to push the mixing rod 47 to mix the materials.

[0046] When the support base 45 moves, the stirring head 48 and the mixing rod 47 agitate and mix the packing inside the packing layer 6, making the packing fully contact with the raw water, thereby improving the filtration effect. At the same time, the filtered impurities are evenly dispersed instead of being concentrated and piled up at the upper end of the packing, avoiding the influence of impurities on the flow of the raw water and reducing the utilization of the packing.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic sand filter, comprising an outer housing, characterized in that: The upper end of the outer housing is fixedly installed with a water inlet, and the lower end of the outer surface of the outer housing is fixedly installed with a support base. A packing chamber is provided at the middle position inside the outer housing, and a water distribution mechanism is arranged at the position between the water inlet and the packing chamber inside the outer housing. An internal mixing mechanism is arranged inside the packing chamber; The internal mixing mechanism includes a motor mounting base, a mixing motor, a connecting rod, a connecting block, a support base, a sealing ring, a mixing rod and a stirring head. An installation groove is provided at the lower end of the outer housing and on the left side of the packing chamber, and the motor mounting base is installed in the installation groove. The upper surface of the motor mounting base is fixedly installed with a mixing motor. A connecting rod is arranged at the position behind the mixing motor on the upper surface of the motor mounting base. The right end of the connecting rod is hinged with a connecting block. The right end of the connecting block is fixedly installed with a support base, and a sealing ring is arranged at the connection between the connecting block and the support base. The support base slides through the right end of the installation groove and then is located inside the packing chamber. The upper surface of the support base is fixedly installed with a mixing rod, and a stirring head is fixedly installed on the side surface of the mixing rod; The water distribution mechanism includes a water distribution pipe, water outlet holes, a first sealing door, a second sealing door, a return spring, a driving magnet, a rotating cavity, an electromagnet and a storage battery. Inside the water distribution pipe, a first sealing door and a second sealing door are respectively and slidably installed inside the upper ends of the remaining water outlet holes except the outermost water outlet hole. One end of the first sealing door and the second sealing door away from the connection between the two is fixedly connected with a driving magnet, and one end of the first sealing door and the second sealing door away from the connection between the two is fixedly connected with a return spring sleeved on the driving magnet. An electromagnet is embedded at the position of the water distribution pipe where the return spring is away from the driving magnet, and a storage battery is embedded at the position below the electromagnet inside the water distribution pipe. The electromagnet and the driving magnet have the same magnetic property; The water distribution pipe is rotatably installed with a trigger plate at the position inside the rotating cavity. One side of the trigger plate is provided with a spring telescopic rod, and a push rod is fixedly installed on the side surface of the trigger plate away from the water outlet hole and below the spring telescopic rod; A driven rod corresponding to the position of the push rod is slidably connected inside the water distribution pipe. One end of the driven rod away from the water outlet hole is fixedly connected with a connection contact, and a storage battery switch is embedded at the position of the water distribution pipe where the connection contact is away from the driven rod; 2. The automatic sand filter according to claim 1, wherein: The rear end of the output shaft of the mixing motor is fixedly installed with a driving disk concentric with it. An installation shaft is fixedly installed at a position near the edge of the rear end surface of the driving disk. The left end of the connecting rod is rotatably connected with the installation shaft; 3. An automatic sand filter according to claim 1, characterized in that: A water distribution chamber is embedded at the position below the water inlet inside the outer housing. The lower end of the water distribution chamber is fixedly connected with the water distribution mechanism. Filter plates are symmetrically and fixedly installed at the upper and lower ends of the packing chamber inside the outer housing. The middle position of the lower surface of the outer housing is fixedly installed with a water outlet, and a water collector is fixedly installed at the position above the water outlet inside the outer housing.

4. An automatic sand filter according to claim 1, characterized in that: The water distribution pipe is installed at the lower end of the water inlet and is evenly arranged along the circumferential direction of the outer housing. One end of the water distribution pipe away from the water inlet slopes downward. Water outlet holes are formed on the lower surface of the water distribution pipe. A rotating cavity is formed at the lower end of the inner side wall of the water distribution pipe where the water outlet holes are located. The first sealing door and the second sealing door are clamped with each other.

5. An automatic sand filter according to claim 1, characterized in that: A spring telescopic rod connected to the inner side wall of the rotating cavity is fixedly installed on the surface of one side of the trigger plate away from the water outlet hole.

6. The automatic sand filter according to claim 5, characterized in that: The spring telescopic rod is arc-shaped, and the ejector rod and the spring telescopic rod are bent at the same angle.

7. An automatic sand filter according to claim 1, characterized in that: A return spring connected to the water distribution pipe is installed at the end of the driven rod away from the ejector rod and below the connecting contact.

8. An automatic sand filter according to claim 1, characterized in that: The mixing rods are evenly distributed on the upper surface of the support base, and the stirring heads are evenly distributed on the side surfaces of the mixing rods.

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