Air-water backwashing filter tank and backwashing method

Abstract

The invention belongs to the technical field of water purification equipment, and provides an air-water backwashing filter tank and a backwashing method.The air-water backwashing filter tank comprises a tank body, the interior of the tank body is sequentially divided into a clear water cavity, a filter cavity and a transition cavity from top to bottom, a filter material layer is arranged at the bottom of the filter cavity, a water feeding assembly is arranged between the clear water cavity and the transition cavity, and the interior of the filter cavity is communicated with a sewage draining assembly; the pollution discharge assembly is arranged above the filter material layer, and the top of the filter cavity is communicated with a water inlet assembly; the backwashing assembly comprises a plurality of communicating pipes, the communicating pipes are arranged in the transition cavity through a lifting mechanism, the lifting mechanism is used for enabling the communicating pipes to be inserted into the filter material layer from bottom to top or drawn out of the filter material layer, the communicating pipes are communicated with the transition cavity, and a plurality of through holes are formed in the side walls of the communicating pipes; and an air-water supply assembly is communicated between the transition cavity and the clear water cavity. The structure of an air source and water source supply mechanism can be simplified while the backwashing effect on the upper layer part of the filter material layer can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water purification equipment, and in particular relates to an air-water backwashing filter tank and a backwashing method. Background Art

[0002] Filtration is the main process of water treatment, and the filter tank is the most important treatment structure in the water plant. The filter tank removes particulate suspended impurities in the water through the interception of the filter media in the tank. When the amount of impurities intercepted by the filter media reaches a certain level, that is, when the saturation of the filter media interception is reached, the filter media needs to be cleaned by backwashing so that the filter media can be re-applied to the filtration process. There are two main ways to backwash the filter media: backwashing with water alone and backwashing with air and water. With the development of various automatic control technologies and equipment, the old processes such as the rapid filter tank and siphon filter tank that were commonly used for backwashing with water alone have basically been eliminated, and new filtration processes such as V-type filter tank, reprint filter tank, and F-type filter tank that are mainly based on air-water combined backwashing have emerged. These new processes are mainly based on the air-water combined backwashing of the filter tank, and the water and gas distribution methods of the filter tank water inlet and backwashing are adjusted differently, in order to achieve more uniform water and gas distribution, improve the filtration quality of the filter tank, and reduce the water and power consumption of backwashing.

[0003] In existing air-water backwashing devices, the filter head structure is usually set at the bottom of the filter material layer, and the air-water mixture sprayed from the filter head stirs the filter material layer, so that impurities on the filter material layer are separated and the backwashing effect is achieved. However, the filter head structure of the existing backwashing device is at the bottom of the filter material layer, and the rising of the air and water is hindered by the filter material layer, and the stirring energy is reduced, resulting in the backwashing effect on the upper part of the filter material layer being poor compared to the lower layer, and the filter material layer cannot be fully flushed, reducing the backwashing effect. In addition, the existing backwashing device needs to be equipped with an air pump and a water pump to provide air source and water source respectively, resulting in a complex overall structure. Summary of the invention

[0004] The purpose of the present invention is to provide an air-water backwashing filter tank and a backwashing method to solve the above problems, so as to improve the backwashing effect on the upper part of the filter material layer and simplify the air source and water source supply structure.

[0005] To achieve the above object, the present invention provides the following solution: an air-water backwash filter tank, comprising:

[0006] A tank body, wherein the tank body is divided into a clean water chamber, a filter chamber and a transition chamber from top to bottom, a filter material layer is arranged at the bottom of the filter chamber, a water supply assembly is arranged between the clean water chamber and the transition chamber, a sewage discharge assembly is connected in the filter chamber, the sewage discharge assembly is arranged above the filter material layer, and a water inlet assembly is connected at the top of the filter chamber;

[0007] The backwash component includes a plurality of connecting pipes, which are arranged in the transition chamber through a lifting mechanism. The lifting mechanism is used to insert the connecting pipes into the filter material layer or withdraw them from the filter material layer from bottom to top. The connecting pipes are connected to the transition chamber, and a plurality of through holes are opened on the side walls of the connecting pipes. An air and water supply component is connected between the transition chamber and the clean water chamber.

[0008] Preferably, the filter chamber and the clean water chamber are separated as well as the filter chamber and the transition chamber by partitions and filter plates respectively; the partitions and filter plates are respectively fixedly connected between the inner walls of the pool body; the filter material layer is arranged on the filter plate; a plurality of holes are opened on the filter plate; and a plurality of connecting pipes respectively penetrate the plurality of holes.

[0009] Preferably, the lifting mechanism comprises a plurality of connecting plates, the plurality of connecting plates are arranged in parallel, and the plurality of connecting plates are fixedly connected by a plurality of connecting rods, a connecting pipe is vertically fixedly connected to the connecting plate, and the bottom opening of the connecting pipe is arranged to pass through the bottom of the connecting plate;

[0010] It also includes a plurality of telescopic rods, which are vertically fixedly connected to the filter plate, and the telescopic ends of the telescopic rods are fixedly connected to the connecting plate.

[0011] Preferably, an upper pressure ring and a lower pressure ring are fixedly sleeved on the side walls of the connecting tube near the top and bottom, respectively, and the upper pressure ring and the lower pressure ring are respectively arranged on the upper and lower sides of the filter plate, and the bottom of the upper pressure ring and the top of the lower pressure ring are respectively fixedly connected with a first rubber pad, and the upper and lower sides of the filter plate are respectively fixedly connected with a second rubber pad, the second rubber pad is slidably connected to the connecting tube, and the two second rubber pads are respectively arranged corresponding to the two first rubber pads.

[0012] Preferably, the air-water supply assembly includes a venturi tube, one end of the venturi tube is connected to the transition chamber, the other end of the venturi tube is connected to an air pump, the throat of the venturi tube is connected to one end of a return pipe, the other end of the return pipe is connected to the clean water chamber, and the return pipe is connected to a fifth solenoid valve.

[0013] Preferably, the water supply assembly includes a water pump, the water inlet end of the water pump is connected to the transition chamber through a water outlet pipe, the water outlet end of the water pump is connected to the clean water chamber through a water inlet pipe, and the water inlet pipe is connected to a first solenoid valve.

[0014] Preferably, the water inlet assembly includes a water inlet main pipe, one end of which passes through the top of the tank body and the partition and is connected to the transition chamber, the other end of which is connected to the sedimentation tank, and the water inlet main pipe is connected to a third solenoid valve;

[0015] The water inlet main pipe is connected with an air pipe, the air pipe is located outside the pool body and between the third solenoid valve and the partition, and the air pipe is connected with a fourth solenoid valve.

[0016] Preferably, the sewage discharge assembly includes a sewage pipe, the sewage pipe is connected to the filter chamber, the sewage pipe is located above the filter material layer, and the sewage pipe is connected to a sixth solenoid valve.

[0017] Preferably, the bottom of the side wall of the clean water chamber is also connected to a water outlet pipe, and the water outlet pipe is connected to a second solenoid valve.

[0018] A backwashing method for an air-water backwashing filter tank, based on an air-water backwashing filter tank as claimed in the claim, the operating steps include:

[0019] Close the water inlet assembly and the water supply assembly;

[0020] A plurality of connecting pipes are controlled by a lifting mechanism to be inserted into the filter material layer from bottom to top;

[0021] Open the air-water supply assembly, let the air and clean water in the clean water chamber flow into the transition chamber, and spray them out through a number of through holes to backwash the filter layer. At the same time, open the sewage discharge assembly to discharge the sewage out of the filter chamber.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects: the main function of the clean water chamber is to store the clean water after filtration; the main function of the filter chamber is to hold the filter material layer and filter the water flowing into the sedimentation tank; the main function of the transition chamber is to evenly flow the water and gas supplied by the air-water supply assembly into a number of connecting pipes; the main function of the connecting pipe is to insert into the filter material layer and spray the air and water into the filter material layer through the through hole; the main function of the lifting mechanism is to lift or lower the height of a number of connecting pipes; the main function of the air-water supply assembly is to provide an air-water mixture; the main function of the water supply assembly is to send the clean water in the transition chamber into the clean water chamber. On the whole, the present invention sets a connecting pipe with a variable height, so that the connecting pipe can be appropriately moved upward during backwashing, and inserted into the filter material layer from bottom to top to a suitable depth, so that the upper layer of the filter material layer can also be fully backwashed during the backwashing process, so that the impurities and mud ball structures in the filter material layer can be fully separated, and at the same time, by simplifying the air-water supply assembly, the working stability of the backwashing filter tank is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a cross-sectional view of the filter tank of the present invention;

[0025] Figure 2 for Figure 1 A partial enlarged view in FIG.

[0026] Figure 3 A top view of several connecting plates of the present invention;

[0027] Figure 4 It is a schematic diagram of the second embodiment of the present invention;

[0028] Among them, 1. pool body; 2. clean water chamber; 3. filter chamber; 4. transition chamber; 5. partition; 6. filter plate; 7. connecting plate; 8. connecting pipe; 9. telescopic rod; 10. outlet pipe; 11. water pump; 12. water inlet pipe; 13. first solenoid valve; 14. outlet pipe; 15. second solenoid valve; 16. water inlet main pipe; 17. third solenoid valve; 18. air pipe; 19. fourth solenoid valve; 20. return pipe; 21. fifth solenoid valve; 22. sewage pipe; 23. sixth solenoid valve; 24. connecting rod; 25. air pump; 26. venturi tube; 27. through hole; 28. lower pressure ring; 29. ​​first rubber pad; 30. upper pressure ring; 31. second rubber pad; 32. vibration-damping rubber sleeve; 321. curved surface connecting glue; 33. filter material layer; 34. hole; 35. tip. DETAILED DESCRIPTION

[0029] In the prior art, there is an air-water backwash filter tank, including a filter tank, a top plate fixedly connected to the top of the filter tank, an exhaust pipe inserted in the middle of the top plate, a water distribution tank fixedly connected to one side of the top plate, a water supply solenoid valve fixedly connected to one side of the bottom of the water distribution tank through a pipeline, the interior of the filter tank is divided into a clean water tank and a purification tank by a conical partition, a filter plate fixedly connected to the bottom of the inner cavity of the purification tank, a plurality of connecting vertical pipes inserted on the surface of the filter plate, a filter material layer is laid on the top of the filter plate, and one side of the bottom of the inner cavity of the purification tank is fixedly connected to A water pump is provided, a mounting base is fixedly connected to one side of the bottom of the filter tank, a mixing box is fixedly connected to the top of the mounting base, a water suction groove is provided on one side of the interior of the mixing box, a mixing chamber is provided on the other side of the interior of the mixing box, an air inlet groove is provided on the top of the mixing chamber, a backwash water pump is fixedly installed in the inner cavity of the water suction groove, a Roots blower is fixedly installed in the inner cavity of the air inlet groove, one end of the mixing chamber is fixedly connected to a flushing solenoid valve through a pipeline, a sewage pipe is fixedly connected to one side of the bottom of the clean water tank, and a sewage solenoid valve is fixedly connected to one end of the sewage pipe.

[0030] In this scheme, the nozzle 27 connected to the top of the vertical pipe is fixedly set at the bottom of the filter layer. The energy of the air-water mixture will decrease during the rising process, which will greatly reduce the backwashing effect on the top of the filter layer. A longer backwashing time is required to achieve the target effect. At the same time, a backwashing water pump and a fan are respectively provided, and a mixing chamber is separately provided. The air source and the water source are mixed in the mixing chamber and then enter the purification tank. In the above scheme, the water pump and the fan are provided at the same time, which increases the complexity of the system and reduces the working stability of the system.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Embodiment 1:

[0034] Reference Figure 1-Figure 3 The present invention provides an air-water backwash filter tank, comprising:

[0035] The tank body 1 is divided into a clean water chamber 2, a filter chamber 3 and a transition chamber 4 from top to bottom. A filter material layer 33 is provided at the bottom of the filter chamber 3. A water supply component is provided between the clean water chamber 2 and the transition chamber 4. A sewage discharge component is connected to the filter chamber 3, and the sewage discharge component is provided above the filter material layer 33. The top of the filter chamber 3 is connected to a water inlet component.

[0036] The backwashing assembly includes a plurality of connecting pipes 8, which are arranged in the transition chamber 4 through a lifting mechanism. The lifting mechanism is used to insert the plurality of connecting pipes 8 into the filter material layer 33 from bottom to top or to extract them from the filter material layer 33. The connecting pipes 8 are connected to the transition chamber 4, and a plurality of through holes 27 are provided on the side walls of the connecting pipes 8. An air and water supply assembly is connected between the transition chamber 4 and the clean water chamber 2.

[0037] The main function of the clean water chamber 2 is to store the clean water after filtration; the main function of the filter chamber 3 is to hold the filter material layer 33 and filter the water flowing into the sedimentation tank; the main function of the transition chamber 4 is to evenly flow the water and gas supplied by the air-water supply assembly into the plurality of connecting pipes 8; the main function of the connecting pipe 8 is to insert into the filter material layer 33 and spray the air and water into the filter material layer 33 through the through hole 27; the main function of the lifting mechanism is to raise or lower the height of the plurality of connecting pipes 8; the main function of the air-water supply assembly is to provide an air-water mixture; the main function of the water supply assembly is to send the clean water in the transition chamber 4 into the clean water chamber 2. On the whole, the present invention provides a connecting pipe with a variable height, so that the connecting pipe can be appropriately moved upward during backwashing, and inserted into the filter material layer from bottom to top to a suitable depth, so that the upper layer of the filter material layer can also be fully backwashed during the backwashing process, so that the impurities and mud ball structures in the filter material layer can be fully separated, and at the same time, by simplifying the air-water supply assembly, the working stability of the backwashing filter tank is improved.

[0038] A further optimization scheme also includes a control unit, which is electrically connected to the water supply component, the sewage discharge component, the water inlet component, the lifting mechanism and the air and water supply component.

[0039] To further optimize the scheme, the filter material layer 33 can be made of quartz sand, marble particles, granite particles, or dolomite particles.

[0040] A further optimized solution is that the filter chamber 3 and the clean water chamber 2 are separated as well as the filter chamber 3 and the transition chamber 4 by a partition 5 and a filter plate 6 respectively. The partition 5 and the filter plate 6 are respectively fixedly connected between the inner walls of the pool body 1. The filter material layer 33 is arranged on the filter plate 6. A plurality of holes 34 are opened on the filter plate 6. A plurality of connecting pipes 8 respectively penetrate the plurality of holes 34.

[0041] like Figure 1 As shown, the main function of the filter plate 6 is to support the filter material layer 33 and allow water to enter the transition chamber 4 through the filter material layer 33 and the filter plate 6 in sequence.

[0042] Further optimized solution, the lifting mechanism includes a plurality of connecting plates 7, the plurality of connecting plates 7 are arranged in parallel, and the plurality of connecting plates 7 are fixedly connected by a plurality of connecting rods 24, and a connecting pipe 8 is vertically fixedly connected to the connecting plate 7, and the bottom opening of the connecting pipe 8 is arranged and passes through the bottom of the connecting plate 7;

[0043] It also includes a plurality of telescopic rods 9 , which are vertically fixedly connected to the filter plate 6 , and the telescopic ends of the telescopic rods 9 are fixedly connected to the connecting plate 7 .

[0044] like Figure 1-Figure 3 As shown, the telescopic rod 9 adopts an electric telescopic rod and takes waterproof measures to enable it to operate normally underwater. In this embodiment, the telescopic rod 9 is provided with four groups, which are respectively located at the four corners of the filter plate 6.

[0045] During daily use, the top of the connecting pipe 8 is located close to the top of the filter plate 6, which can prevent the connecting pipe 8 from being in the filter material layer 33 for a long time and affecting the filtering effect. When backwashing is required, the control unit controls the telescopic rod 9 to shorten its telescopic end, driving the plurality of connecting plates 7 to rise, so that the plurality of connecting pipes 8 are inserted into the filter material layer 33 from bottom to top, so that the through hole 27 on the connecting pipe 8 is as close to the top of the filter material layer 33 as possible, thereby improving the backwashing effect on the top of the filter material layer 33.

[0046] The length of the connecting pipe 8 and the shape of the telescopic rod 9 need to be set to prevent the connecting pipe 8 from being too close to the top of the filter material layer 33 and affecting the structural stability of the filter material layer 33 .

[0047] As a further optimization scheme, a tip 35 is fixedly connected to the top of the connecting tube 8, and the tip 35 can reduce the resistance of the connecting tube 8 extending into the filter material layer 33. At the same time, when the connecting tube 8 descends, the filter components in the filter material layer 33 can collapse quickly and restore uniformity.

[0048] A further optimized solution is that an upper pressure ring 30 and a lower pressure ring 28 are fixedly sleeved on the side wall of the connecting pipe 8 near the top and bottom, and the upper pressure ring 30 and the lower pressure ring 28 are respectively arranged on the upper and lower sides of the filter plate 6, and the bottom of the upper pressure ring 30 and the top of the lower pressure ring 28 are respectively fixedly connected with a first rubber pad 29, and the upper and lower sides of the filter plate 6 are respectively fixedly connected with a second rubber pad 31, the second rubber pad 31 is slidably connected to the connecting pipe 8, and the two second rubber pads 31 are respectively arranged corresponding to the two first rubber pads 29.

[0049] Since there is inevitably a gap between the hole 34 and the connecting pipe 8, a first rubber pad 29 and a second rubber pad 31 structure are provided.

[0050] like Figure 2 As shown, during daily use, the connecting pipe 8 is in a low position. At this time, the first rubber pad 29 at the bottom of the upper pressure ring 30 is attached and squeezed with the second rubber pad 31 at the top of the filter plate 6. The gap between the connecting pipe 8 and the hole 34 is compensated by the attachment of the first rubber pad 29 and the second rubber pad 31, thereby preventing water or tiny impurities from entering the transition chamber 4 through the hole 34 during use.

[0051] Similarly, when backwashing is required, the control unit controls the telescopic rod 9 to retract the telescopic end, so that the connecting pipe 8 moves up and is inserted into the filter material layer 33. When the telescopic rod 9 is retracted into place, the first rubber pad 29 on the top of the lower pressure ring 28 on the connecting pipe 8 is attached and pressed against the second rubber pad 31 at the bottom of the filter plate 6, thereby preventing sewage from entering the transition chamber 4 from the hole 34 during the backwashing process.

[0052] To further optimize the solution, the air-water supply assembly includes a venturi tube 26, one end of the venturi tube 26 is connected to the transition chamber 4, the other end of the venturi tube 26 is connected to the air pump 25, the throat of the venturi tube 26 is connected to one end of the return pipe 20, the other end of the return pipe 20 is connected to the clean water chamber 2, and the return pipe 20 is connected to a fifth solenoid valve 21.

[0053] like Figure 1 As shown, by using the venturi tube 26, when the air pump 25 provides air pressure, the airflow enters the transition chamber 4 through the venturi tube 26, and at the same time, a large negative pressure is generated at the throat of the venturi tube 26. The clean water in the clean water chamber 2 can be pumped out by utilizing this negative pressure, so that the water and air contact and mix at the throat of the venturi tube 26 and enter the transition chamber 4 together, thereby providing an air source and a water source for backwashing the connecting pipe 8.

[0054] A further optimized solution is that the water supply component includes a water pump 11, the water inlet end of the water pump 11 is connected to the transition chamber 4 through the water outlet pipe 10, the water outlet end of the water pump 11 is connected to the clean water chamber 2 through the water inlet pipe 12, and the water inlet pipe 12 is connected to a first solenoid valve 13.

[0055] like Figure 1 As shown, during daily use, clean water filtered by the filter layer 33 enters the transition chamber 4, and is pumped by the water pump 11 and sequentially enters the clean water chamber 2 through the water outlet pipe 10 and the water inlet pipe 12 for temporary storage.

[0056] Further optimizing the scheme, the water inlet assembly includes a water inlet main pipe 16, one end of the water inlet main pipe 16 passes through the top of the tank body 1 and the partition 5 and is connected to the transition chamber 4, the other end of the water inlet main pipe 16 is connected to the sedimentation tank, and the water inlet main pipe 16 is connected to a third solenoid valve 17;

[0057] The water inlet main pipe 16 is connected to an air pipe 18 , which is located outside the pool body 1 and between the third solenoid valve 17 and the partition plate 5 . The air pipe 18 is connected to a fourth solenoid valve 19 .

[0058] like Figure 1 As shown, the water inlet main pipe 16 passes through the clean water chamber 2 and is connected with the filter chamber 3. The water in the sedimentation tank is directly poured into the filter chamber 3 through the water inlet main pipe 16 and contacts the filter material layer 33. Under the action of gravity, the water enters the transition chamber 4 through the filter material layer 33 and the filter plate 6, and the impurities or mud ball structures in the water are retained by the filter material layer 33.

[0059] The main function of the air pipe 18 is to allow gas to be discharged through the water inlet main pipe 16 and the air pipe 18 during backwashing.

[0060] According to a further optimized solution, the sewage discharge assembly includes a sewage pipe 22 , which is connected to the filter chamber 3 , and is located above the filter material layer 33 . The sewage pipe 22 is connected to a sixth solenoid valve 23 .

[0061] like Figure 1 As shown, during the backwashing process, since the impurities and mud ball structures in the filter material layer 33 are flushed and floated, sewage will be formed above the filter material layer 33. At this time, the sewage in the filter chamber 3 can be discharged by opening the sixth solenoid valve 23, so as to timely discharge various impurities separated from the filter material layer 33.

[0062] According to a further optimized solution, the bottom of the side wall of the clean water chamber 2 is also connected to a water outlet pipe 14 , and the water outlet pipe 14 is connected to a second solenoid valve 15 .

[0063] like Figure 1 As shown, the water outlet pipe 14 is connected to a subsequent processing structure, so that the clean water in the clean water chamber 2 can be discharged in time.

[0064] A backwashing method for an air-water backwashing filter tank, the operating steps comprising:

[0065] Close the water inlet assembly and the water supply assembly;

[0066] A plurality of connecting pipes 8 are controlled by a lifting mechanism to be inserted into the filter material layer 33 from bottom to top;

[0067] The air-water supply assembly is turned on to pass the air and the clean water in the clean water chamber 2 into the transition chamber 4 and spray out through a plurality of through holes 27 to backwash the filter material layer 33. At the same time, the sewage discharge assembly is turned on to discharge the sewage out of the filter chamber 3.

[0068] Specifically, in daily use, the third solenoid valve 17 and the first solenoid valve 13 are in the open state, the fifth solenoid valve 21, the sixth solenoid valve 23, and the fourth solenoid valve 19 are in the closed state, and the telescopic rod 9 is in the extended state. The sewage in the sedimentation tank enters the filter material layer 33 through the water inlet main pipe 16, and is filtered through the filter material layer 33. The filtered clean water enters the transition chamber 4, and is pumped by the water pump 11 and enters the clean water chamber 2 for temporary storage.

[0069] When the clean water storage in the clean water chamber 2 reaches a certain value, the second solenoid valve 15 can be opened to release the clean water to flow to the subsequent processing equipment.

[0070] When backwashing is required, the third solenoid valve 17 and the first solenoid valve 13 are closed, and the fifth solenoid valve 21, the sixth solenoid valve 23 and the fourth solenoid valve 19 are opened. At the same time, the telescopic rod 9 is controlled to lift the connecting pipe 8 and insert it into the filter material layer 33 to a certain height. At the same time, the air pump 25 is started to supply gas to the transition chamber 4, and the clean water in the clean water chamber 2 is extracted by using the characteristics of the venturi tube 26, and a gas-water mixture is supplied to the transition chamber 4. The gas-water mixture in the transition chamber 4 enters the connecting pipe 8 through the bottom opening of the connecting pipe 8 and is sprayed into the filter material layer 33 through a plurality of through holes 27, and the filter material layer 33 is stirred, so that impurities and mud ball structures float up under the action of gas and water, so that the formed sewage is discharged from the sewage pipe 22, and the excess gas can be discharged from the air pipe 18, thereby reducing the gas resistance and ensuring the continuity of the gas-water backwashing process.

[0071] Embodiment 2:

[0072] The only difference between this embodiment and the first embodiment is that a vibration-damping rubber sleeve 32 is provided in the fixed sleeve in the hole 34, a vibration mechanism (not shown in the figure) is provided on the plurality of connecting plates 7, and the connecting pipe 8 slides through the vibration-damping rubber sleeve. When the vibration mechanism drives the connecting pipe 8 to vibrate through the connecting plate 7, the vibration-damping rubber sleeve 32 is used to absorb the relative displacement between the connecting pipe 8 and the filter plate 6.

[0073] like Figure 4 As shown, the vibration-damping rubber sleeve 32 includes two groups of rubber rings, inner and outer, which are fixedly connected by a plurality of curved surface connecting glues 321. The outer rubber ring is fixedly embedded in the hole 34, and the connecting pipe 8 is slidably connected with the inner rubber ring. The main function of the curved surface connecting glue 321 is to absorb the relative vibration between the outer rubber ring and the inner rubber ring through its own variability, which not only ensures that the connecting pipe 8 can vibrate, but also avoids damage to the filter plate 6 when the connecting pipe 8 vibrates.

[0074] When backwashing is completed, the telescopic rod 9 drives the connecting pipe 8 to descend through the connecting plate 7, and the control unit controls several vibration mechanisms to start. The vibration mechanisms drive the connecting plate 7 to vibrate, so that the connecting pipe 8 vibrates in the filter material layer 33 while descending, so that when the connecting pipe 8 exits the filter material layer 33 downward, the upper filter material layer 33 can collapse in time under the action of vibration, and when the connecting pipe 8 descends to the point where the first rubber pad on the upper pressure ring 30 fits with the second rubber pad 31 on the top of the filter plate 6, there are no holes in the filter material layer 33 above the connecting pipe 8, and the evenness of the laying of the filter material layer 33 ensures the filtration quality.

[0075] To further optimize the solution, a small vibrator can be used for the vibration structure, and waterproof treatment should be done at the same time so that it can operate normally underwater.

[0076] According to a further optimized solution, since a number of connecting plates 7 are fixedly connected by connecting rods 24 , the vibration structure only needs to be installed on some of the connecting plates 7 .

[0077] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0078] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An air-water backwash filter tank, characterized in that ,include: A pool body (1), wherein the pool body (1) is divided into a clean water chamber (2), a filter chamber (3) and a transition chamber (4) from top to bottom, a filter material layer (33) is arranged at the bottom of the filter chamber (3), a water supply component is arranged between the clean water chamber (2) and the transition chamber (4), a sewage discharge component is connected to the filter chamber (3), and the sewage discharge component is arranged above the filter material layer (33), and a water inlet component is connected to the top of the filter chamber (3); A backwashing assembly comprises a plurality of connecting pipes (8), wherein the plurality of connecting pipes (8) are arranged in the transition chamber (4) via a lifting mechanism, wherein the lifting mechanism is used to insert the plurality of connecting pipes (8) into the filter material layer (33) from bottom to top or to extract the plurality of connecting pipes (8) from the filter material layer (33), wherein the connecting pipes (8) are in communication with the transition chamber (4), a plurality of through holes (27) are provided on the side wall of the connecting pipes (8), and an air-water supply assembly is in communication between the transition chamber (4) and the clean water chamber (2).

2. The air-water backwash filter tank according to claim 1, characterized in that: The filter chamber (3) and the clean water chamber (2) and the filter chamber (3) and the transition chamber (4) are separated by a partition plate (5) and a filter plate (6), respectively. The partition plate (5) and the filter plate (6) are respectively fixedly connected to the inner wall of the pool body (1). The filter material layer (33) is arranged on the filter plate (6). The filter plate (6) is provided with a plurality of holes (34), and the plurality of connecting pipes (8) respectively penetrate the plurality of holes (34).

3. The air-water backwash filter tank according to claim 2, characterized in that: The lifting mechanism comprises a plurality of connecting plates (7), the plurality of connecting plates (7) are arranged in parallel, and the plurality of connecting plates (7) are fixedly connected by a plurality of connecting rods (24), a connecting pipe (8) is vertically fixedly connected to the connecting plate (7), and the bottom of the connecting pipe (8) is opened and passes through the bottom of the connecting plate (7); It also comprises a plurality of telescopic rods (9), wherein the plurality of telescopic rods (9) are vertically fixedly connected to the filter plate (6), and the telescopic ends of the telescopic rods (9) are fixedly connected to the connecting plate (7).

4. The air-water backwash filter tank according to claim 2, characterized in that: An upper pressure ring (30) and a lower pressure ring (28) are fixedly sleeved on the side wall of the connecting pipe (8) near the top and bottom, respectively. The upper pressure ring (30) and the lower pressure ring (28) are respectively arranged on the upper and lower sides of the filter plate (6). The bottom of the upper pressure ring (30) and the top of the lower pressure ring (28) are respectively fixedly connected with a first rubber pad (29). The upper and lower sides of the filter plate (6) are respectively fixedly connected with a second rubber pad (31). The second rubber pad (31) is slidably connected to the connecting pipe (8), and the two second rubber pads (31) are respectively arranged corresponding to the two first rubber pads (29).

5. The air-water backwash filter tank according to claim 1, characterized in that: The air-water supply assembly comprises a venturi tube (26), one end of the venturi tube (26) is connected to the transition chamber (4), the other end of the venturi tube (26) is connected to an air pump (25), the throat of the venturi tube (26) is connected to one end of a return water pipe (20), the other end of the return water pipe (20) is connected to the clean water chamber (2), and the return water pipe (20) is connected to a fifth solenoid valve (21).

6. The air-water backwash filter tank according to claim 1, characterized in that: The water supply assembly comprises a water pump (11), the water inlet end of the water pump (11) is connected to the transition chamber (4) through a water outlet pipe (10), the water outlet end of the water pump (11) is connected to the clean water chamber (2) through a water inlet pipe (12), and the water inlet pipe (12) is connected to a first solenoid valve (13).

7. The air-water backwash filter tank according to claim 2, characterized in that: The water inlet assembly comprises a water inlet main pipe (16), one end of the water inlet main pipe (16) passes through the top of the tank body (1) and the partition (5) to communicate with the transition chamber (4), the other end of the water inlet main pipe (16) is communicated with the sedimentation tank, and the water inlet main pipe (16) is connected to a third solenoid valve (17); The water inlet main pipe (16) is connected to an air pipe (18), the air pipe (18) is located outside the pool body (1) and between the third solenoid valve (17) and the partition (5), and the air pipe (18) is connected to a fourth solenoid valve (19).

8. The air-water backwash filter tank according to claim 1, characterized in that: The sewage discharge assembly comprises a sewage pipe (22), the sewage pipe (22) is connected to the filter chamber (3), the sewage pipe (22) is located above the filter material layer (33), and the sewage pipe (22) is connected to a sixth solenoid valve (23).

9. The air-water backwash filter tank according to claim 1, characterized in that: The bottom of the side wall of the clean water chamber (2) is also connected to a water outlet pipe (14), and the water outlet pipe (14) is connected to a second solenoid valve (15).

10. A backwashing method for an air-water backwashing filter tank, based on the air-water backwashing filter tank according to claim 1, characterized in that: The steps include: Close the water inlet assembly and the water supply assembly; A plurality of connecting pipes (8) are controlled by a lifting mechanism to be inserted into the filter material layer (33) from bottom to top; The air and water supply assembly is turned on to allow air and clean water in the clean water chamber (2) to flow into the transition chamber (4) and to be sprayed out through a plurality of through holes (27) to backwash the filter material layer (33). At the same time, the sewage discharge assembly is turned on to discharge sewage from the filter chamber (3).

Images