A V-type filter backwash device and method

Abstract

The application provides a V-shaped filter tank backwashing device, which comprises a filter material blocking part, an air flushing system, a water flushing system and a V-shaped filter tank main part. The air flushing system and the water flushing system are arranged at the bottom of the filter tank. The filter material blocking part comprises a blocking filter plate and a driving part. One end of the blocking filter plate is rotatably arranged on the overflow blocking wall close to one side of the filter tank. The shape and area of the blocking filter plate are the same as those of the filter tank. The filter hole diameter of the blocking filter plate is smaller than the diameter of the filter material in the filter material layer. The power output end of the driving part is connected with the blocking filter plate. When the driving part drives the blocking filter plate to rotate to the vertical horizontal state, the top of the blocking filter plate exceeds the overflow blocking wall. The V-shaped filter tank backwashing device provided by the application ensures that the filter material is always in the filter tank during backwashing, so that the input of the air flushing system / water flushing system and the surface water sweeping flow of the water inlet system can be adjusted to a higher level, the efficiency and effect of backwashing are ensured, and the loss of filter material is avoided.

Description

Technical Field

[0001] This invention relates to the field of water treatment, and in particular to a V-type filter backwashing device and method. Background Technology

[0002] V-type filters are a commonly used filter structure in the water treatment field. They filter wastewater through filter media within the filter bed. The filter media is homogeneous, i.e., uniform particle size filter media. The purpose of purifying wastewater is achieved by adsorbing impurities in the wastewater through the filter media. However, after a long period of filtration, the filtration efficiency and effect will deteriorate due to the excessive impurities adsorbed by the filter media itself. In order to maintain the filtration effect and efficiency of V-type filters, backwashing is usually performed. The traditional backwashing device backwashes by introducing gas / clean water into the bottom of the filter media, so that the impurities adsorbed inside the filter media are flushed to the surface of the filter media. Then, the water sweeping action of the upper V-shaped water inlet tank of the V-type filter bed sweeps the surface of the filter media (the water on the surface of the filter media, including the impurities flushed up from the inside of the filter media, is discharged into the drainage tank on one side), thereby achieving the purpose of backwashing the filter media.

[0003] However, during backwashing, if the flow rate of gas / water introduced to the bottom of the filter media is too high, or the water sweeping flow rate of the V-shaped inlet trough is too high, the filter media in the filter tank can easily be flushed into the drain trough and discharged, resulting in a significant loss of filter media. On the other hand, if the flow rate of gas / water introduced to the bottom of the filter media is controlled to a smaller range, or the water sweeping flow rate of the V-shaped inlet trough is reduced to a smaller amount, the backwashing effect of the filter media will be poor, and the backwashing time will be too long (in order to improve the backwashing effect). Summary of the Invention

[0004] One object of the present invention is to provide a V-type filter backwashing device to solve the technical problems of filter media loss and poor backwashing effect and efficiency in traditional V-type filter backwashing devices during backwashing.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a V-type filter backwashing device, the V-type filter backwashing device comprising:

[0006] The main body of the V-shaped filter tank includes an inlet system, a filtration system, a drainage system, and a clean water discharge system. The filtration system includes a filter tank with a filter media layer inside. The inlet system is located at the top of the filter tank. The drainage system is located on one side of the filter tank, and an overflow barrier wall is provided between the drainage system and the filter tank. The clean water discharge system is located at the bottom of the filter tank.

[0007] An air flushing system is provided at the bottom of the filter tank and is used to introduce gas into the bottom of the filter tank.

[0008] A water flushing system is provided at the bottom of the filter tank, and the water flushing system is used to introduce clean water into the bottom of the filter tank;

[0009] The filter media barrier includes a barrier filter plate and a drive unit. One end of the barrier filter plate is rotatably mounted on the overflow barrier wall near the filter tank. The shape and area of ​​the barrier filter plate are the same as those of the filter tank, and the diameter of the filter holes in the barrier filter plate is smaller than the diameter of the filter media in the filter media layer. The power output end of the drive unit is connected to the barrier filter plate. When the drive unit drives the barrier filter plate to rotate to a vertical horizontal plane, the top of the barrier filter plate extends beyond the overflow barrier wall.

[0010] In one embodiment, a permeable plate is provided at the lower layer of the filter tank, the filter media layer is located above the permeable plate, and the clean water discharge system is connected to the filter tank below the permeable plate via a pipe.

[0011] In one embodiment, the water inlet system includes a V-shaped water inlet trough, which is disposed above the filter tank, and water inlet holes are uniformly arranged at the bottom of the V-shaped water inlet trough.

[0012] In one embodiment, the drainage system includes a drainage trough and a drainage valve, wherein the drainage valve controls the drainage trough to perform a drainage action;

[0013] The clean water discharge system includes a clean water output pipe, and a clean water output valve is installed on the clean water output pipe.

[0014] In one embodiment, the water flushing system includes a water flushing pump and a water flushing pipe. One end of the water flushing pipe is connected to a clean water tank, and the other end of the water flushing pipe is connected to a clean water output pipe. The connection point between the two is located between the clean water output valve and the filter tank. A water flushing valve is provided on the water flushing pipe. The water flushing pump is connected to the water flushing pipe.

[0015] In one embodiment, the air-cushioning system includes:

[0016] air pump;

[0017] An air-pumping pipe, one end of which is connected to the output end of the air pump, and the other end of which extends into the bottom of the filter tank;

[0018] An air jet nozzle, the bottom of which is connected to the air jet pipe, and the top of which is inserted into the filter media layer.

[0019] In one embodiment, the air jet nozzle includes:

[0020] The nozzle body has a frustum-shaped jet end and an airflow channel inside. The jet end has several upward-sloping and outward-radiating air outlets.

[0021] A one-way valve structure is provided in the airflow channel of the nozzle body, and the one-way valve structure is used to prevent liquid from entering the air jet pipe.

[0022] In one embodiment, when the barrier filter plate is in a vertically upright state, there is a certain gap between the barrier filter plate and the overflow barrier wall on one side. The bottom of the barrier filter plate is tightly attached to the inner wall of the filter tank. A buffer filter block is provided on the top of the overflow barrier wall near the filter tank. The pore size of the buffer filter block is larger than that of the barrier filter plate.

[0023] In one embodiment, a support platform is provided on the side of the filter tank away from the overflow barrier wall. The support platform is at the same height as the pivot of the barrier filter plate. When the barrier filter plate is lowered, the barrier filter plate abuts against the support platform.

[0024] Another object of the present invention is to provide a backwashing method for a V-type filter, which employs the V-type filter backwashing device described in any of the above embodiments, and the V-type filter backwashing method includes the following steps:

[0025] S1. Close the water inlet system and stop inputting wastewater into the filter tank;

[0026] S2. Wait for the filtration system to filter and output the wastewater in the filter tank until the water level of the wastewater is lower than the plane where the barrier filter plate is located.

[0027] S3. Start the drive unit to rotate the filter plate to a vertical position so that the filter plate is pressed against the overflow barrier wall and the clean water discharge system is shut off.

[0028] S4. Gas backwashing: Start the air flushing system and open the water inlet system. Use the air flushing system to introduce gas into the filter media layer, so that the impurities in the filter media layer are flushed to the upper water. Then, under the water sweeping action of the water inlet system, the impurities flow along the top of the overflow barrier wall into the drainage system and are discharged through the drainage system.

[0029] S5. Start the water flushing system. Use the water flushing system to introduce upward-flowing clean water into the filter media layer. The clean water and the air flushing system work together to backwash the filter media layer. At this time, the water inlet system is kept open to continuously sweep the upper surface of the filter media layer with water, which improves the backwashing effect. Because the overflow barrier wall is equipped with a filter plate, the filter media in the filter media layer will not be discharged from the filter tank into the drainage system, thus avoiding the loss of filter media.

[0030] S6. After backwashing is completed and the filter media layer has settled and stabilized, close the drainage system, air flushing system, and water flushing system, open the clean water discharge system, and start the drive unit to make the filter plate rotate horizontally so that the filter tank can carry out normal filtration.

[0031] The above-described technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0032] The V-type filter backwashing device provided in this embodiment of the invention, when in normal filtration state, has its barrier filter plate in the filter media barrier section horizontal and located above the filter media layer. At this time, the barrier filter plate can perform preliminary filtration of wastewater, removing larger impurities to improve filtration efficiency. When backwashing is required, the drive unit in the filter media barrier section drives the barrier filter plate to rotate, causing it to stand vertically inside the overflow barrier wall. During this process, most of the large particles filtered out by the barrier filter plate are thrown into the drainage system, ensuring that these large particles are also discharged during backwashing. Then, when the air / water flushing system is activated to backwash the filter media layer, impurities flushed out of the filter media (the diameter of these impurities is smaller than the pore size of the barrier filter plate) pass through the barrier filter plate with the water in the upper layer of the filter tank and overflow along the top of the overflow barrier wall into the drainage system, thus removing impurities from the filter media through backwashing. Because the diameter of the filter media is larger than the pore size of the barrier filter plate, the filter media in the upper water cannot pass through the barrier filter plate. This ensures that the filter media remains in the filter tank during the backwashing process and does not flow into the drainage system, thus preventing filter media loss. As a result, the input of the air flushing system / water flushing system and the surface water sweeping flow rate of the inlet water system can be adjusted to a high level to ensure the efficiency and effectiveness of backwashing without any filter media loss. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1This is a schematic diagram of the V-type filter backwashing device provided in an embodiment of the present invention under normal filtration conditions;

[0035] Figure 2 This is a schematic diagram of the V-type filter backwashing device provided in the embodiment of the present invention in the backwashing state;

[0036] Figure 3 for Figure 1 A magnified view of a portion of point A in the middle;

[0037] Figure 4 for Figure 1 A magnified view of a portion of point B in the middle;

[0038] Figure 5 This is a diagram showing the partial fit between the barrier filter plate and the overflow barrier wall provided in an embodiment of the present invention.

[0039] The labels for the various figures are as follows:

[0040] 2. Air flushing system; 3. Water flushing system; 4. Filter media barrier; 5. Overflow barrier wall; 11. Water inlet system; 12. Filtration system; 13. Drainage system; 14. Clean water discharge system; 21. Air flushing pipe; 22. Air flushing nozzle; 31. Water flushing valve; 41. Barrier filter plate; 42. Drive unit; 51. Buffer filter block; 121. Filter tank; 122. Filter media layer; 123. Water seepage plate; 141. Clean water output pipe; 142. Clean water output valve; 221. Nozzle body; 222. One-way valve structure; 1211. Support platform; 2211. Airflow channel; 2212. Air outlet. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Please see Figures 1 to 5 This application provides a V-shaped filter backwashing device, including a filter media barrier 4, an air flushing system 2, a water flushing system 3, and a V-shaped filter body. The V-shaped filter body includes an inlet system 11, a filtration system 12, a drainage system 13, and a clean water discharge system 14. The filtration system 12 includes a filter tank 121, within which a filter media layer 122 is disposed. The inlet system 11 is located at the top of the filter tank 121. The drainage system 13 is located on one side of the filter tank 121, and an overflow barrier wall 5 is provided between the drainage system 13 and the filter tank 121. The clean water discharge system 14 is located at the bottom of the filter tank 121. The air flushing system 2 is located at the bottom of the filter tank 121 and is used to introduce gas into the bottom of the filter tank 121. The water flushing system 3... Located at the bottom of the filter tank 121, the water flushing system 3 is used to introduce clean water into the bottom of the filter tank 121; the filter media barrier part 4 includes a barrier filter plate 41 and a drive part 42. One end of the barrier filter plate 41 is rotatably mounted on the overflow barrier wall 5 near the side of the filter tank 121. The shape and area of ​​the barrier filter plate 41 are the same as those of the filter tank 121. The diameter of the filter holes of the barrier filter plate 41 is smaller than the diameter of the filter media in the filter media layer 122; the power output end of the drive part 42 is connected to the barrier filter plate 41. When the drive part 42 drives the barrier filter plate 41 to rotate to a vertical horizontal plane, the top of the barrier filter plate 41 extends beyond the overflow barrier wall 5.

[0046] The V-type filter backwashing device provided in this embodiment, when in normal filtration state, has the barrier filter plate 41 in the filter media barrier section 4 in a horizontal state and located above the filter media layer 122. At this time, the barrier filter plate 41 can perform preliminary filtration of wastewater, removing larger impurities in the wastewater to improve the filtration effect. When backwashing is required, the drive section 42 in the filter media barrier section 4 drives the barrier filter plate 41 to rotate, so that the barrier filter plate 41 stands vertically inside the overflow barrier wall 5. During this process, most of the large particles of impurities filtered out by the barrier filter plate 41 are thrown into the drainage system 13, so that the large particles of impurities filtered out by the barrier filter plate 41 can also be discharged during the backwashing process. Then, when the air flushing system 2 / water flushing system 3 is activated to backwash the filter media layer 122, the impurities washed out from the filter media (the diameter of these impurities is smaller than the pore size of the barrier filter plate 41) will pass through the barrier filter plate 41 with the water in the upper layer of the filter tank 121 and overflow into the drainage system 13 along the top of the overflow barrier wall 5, so that the impurities in the filter media can be removed by backwashing. Since the diameter of the filter media is larger than the pore size of the barrier filter plate 41, the filter media in the upper layer of water cannot pass through the barrier filter plate 41, thus ensuring that the filter media always stays in the filter tank 121 during the backwashing process and will not flow into the drainage system 13 and cause filter media loss. Therefore, the input of the air flushing system 2 / water flushing system 3 and the surface water sweeping flow rate of the inlet water system 11 can be adjusted to a higher level to ensure the efficiency and effect of backwashing and to prevent filter media loss.

[0047] In one embodiment, a permeation plate 123 is provided at the lower layer of the filter tank 121, and the filter media layer 122 is located above the permeation plate 123. The clean water discharge system 14 is connected to the filter tank 121 below the permeation plate 123 via a pipe. Optionally, the permeation plate 123 can be a porous metal plate with a pore size smaller than the diameter of the filter media. By providing the permeation plate 123 at the bottom of the filter media layer, the contact area between the permeation plate 123 and the bottom of the filter media layer 122 is large, allowing the clean water filtered by the filter media layer 122 to pass through the permeation plate 123 in a timely manner and enter the bottom of the filter tank 121, so that the clean water discharge system 14 can discharge the filtered clean water in a timely manner, thereby improving the filtration efficiency.

[0048] In one embodiment, the water inlet system 11 includes a V-shaped water inlet trough positioned above the filter tank 121, with water inlet holes evenly distributed at the bottom. A gate is provided at one end of the V-shaped water inlet trough to control the amount of wastewater entering the trough, thereby controlling the amount of wastewater entering the filter tank 121. By providing water inlet holes at the bottom of the V-shaped water inlet trough, during backwashing, wastewater in the V-shaped water inlet trough can flow downwards into the filter tank 121 through the water inlet holes, thereby achieving surface water sweeping of the filter media layer 122 below.

[0049] In one embodiment, the drainage system 13 includes a drainage tank and a drainage valve, the drainage valve controlling the drainage tank to perform drainage operations; the clean water discharge system 14 includes a clean water output pipe 141, and a clean water output valve 142 is provided on the clean water output pipe 141. When backwashing is performed, simply open the drainage valve to allow the wastewater entering the drainage tank to be discharged in a timely manner. Then close the clean water output valve 142 to prevent unfiltered wastewater from entering the clean water tank through the clean water output pipe 141.

[0050] like Figure 2 As shown, in one embodiment, the water flushing system 3 includes a water flushing pump and a water flushing pipe. One end of the water flushing pipe is connected to a clean water tank, and the other end is connected to a clean water output pipe 141. The connection point between the two is between the clean water output valve 142 and the filter tank 121. A water flushing valve 31 is provided on the water flushing pipe. The water flushing pump is connected to the water flushing pipe. When backwashing is required, simply close the clean water output valve 142 and open the water flushing pump and the water flushing valve 31. The clean water in the clean water tank can then be reversed through the clean water output pipe 141 to the bottom of the filter tank 121. After entering the bottom of the filter tank 121, the clean water flows upward through the permeation plate 123, thereby flushing the filter media layer 122.

[0051] In one embodiment, the air flushing system 2 includes an air flushing nozzle 22, an air flushing pipe 21, and an air pump. One end of the air flushing pipe 21 is connected to the output end of the air pump, and the other end extends into the bottom of the filter tank 121. The bottom of the air flushing nozzle 22 is connected to the air flushing pipe 21, and the top of the air flushing nozzle 22 is inserted into the filter media layer 122. During air flushing, the air pump supplies airflow into the air flushing pipe 21. The airflow flows within the air flushing pipe 21 until it exits from the air flushing nozzle 22, allowing the airflow to penetrate to the bottom layer of the filter media. By allowing airflow into the bottom layer of the filter media layer 122, the filter media and water within the filter media layer 122 undergo vigorous mutual movement (friction and collision), causing impurities adsorbed on the surface of the filter media to detach from the surface and flow upwards to the surface of the filter media layer 122.

[0052] like Figure 3 As shown, in one embodiment, the air jet nozzle 22 includes a one-way valve structure 222 and a nozzle body 221. The jet end of the nozzle body 221 has a frustum-shaped structure, and an airflow channel 2211 is provided inside the nozzle body 221. Several upwardly inclined and outwardly diverging air outlets 2212 are provided inside the jet end. The one-way valve structure 222 is disposed in the airflow channel 2211 of the nozzle body 221, and the one-way valve structure 222 is used to prevent liquid from entering the air jet pipe 21.

[0053] By using a one-way valve structure 222 within the nozzle body 221, liquid is prevented from flowing into the air jet pipe 21 through the air outlet 2212-airflow channel 2211. Meanwhile, the airflow within the air jet pipe 21 can be discharged into the filter media layer 122 via the one-way valve. Furthermore, because the air outlet 2212 is sloping upwards and radiates outwards, the pressure exerted by the filter media above the nozzle body 221 primarily acts on the top surface of the nozzle body 221, with less pressure on the sides. This reduces the resistance encountered by the airflow as it exits the air jet nozzle 22, and also prevents the filter media above the air jet nozzle 22 from becoming blocked or entering the air outlet 2212 under pressure, ensuring the normal operation of the air jet nozzle 22.

[0054] like Figure 5 As shown, in one embodiment, when the barrier filter plate 41 is in a vertically upright state, there is a certain gap between the barrier filter plate 41 and the overflow barrier wall 5 on one side. The bottom of the barrier filter plate 41 is tightly attached to the inner wall of the filter tank 121. A buffer filter block 51 is provided on the top of the overflow barrier wall 5 near the filter tank 121. The pore size of the buffer filter block 51 is larger than the pore size of the barrier filter plate 41 (the pore size is large enough so that large particles of impurities can pass through the barrier filter plate 41).

[0055] During backwashing, as the drive unit 42 drives the barrier filter plate 41 to rotate to a vertical position, most of the large particles (particles with a diameter larger than the filter hole diameter of the barrier filter plate 41) filtered out by the barrier filter plate 41 are thrown into the drainage system 13 (drainage tank). However, a small portion of the large particles fall between the barrier filter plate 41 and the overflow barrier wall 5. In order to remove these large particles during backwashing, a certain gap is set between the barrier filter plate 41 and the overflow barrier wall 5 (the gap is large enough so that the large particles can flow upward under the backwashing water flow to the top of the overflow barrier wall 5 and be discharged outside). This allows the large particles to pass through the buffer filter block 51 and be discharged into the drainage system 13. The buffer filter block 51 also has a buffering effect, so that when the barrier filter plate 41 rotates to stand vertically and collides with the buffer filter block 51, while ensuring that the impurities on the barrier filter plate 41 can be thrown off under the action of a large inertial force, the buffer filter block 51 plays a buffering role and reduces the impact force on the barrier filter plate 41.

[0056] In one embodiment, a support platform 1211 is provided on the side of the filter tank 121 away from the overflow barrier wall 5. The support platform 1211 is at the same height as the pivot of the barrier filter plate 41. When the barrier filter plate 41 is lowered, the barrier filter plate 41 abuts against the support platform 1211.

[0057] Another object of the present invention is to provide a backwashing method for a V-type filter, which employs the V-type filter backwashing device of any of the above embodiments. The V-type filter backwashing method includes the following steps:

[0058] S1. Close the water inlet system 11 and stop the input of wastewater into the filter tank 121;

[0059] S2. Wait for the filtration system 12 to filter and output the wastewater in the filter tank 121 until the water level of the wastewater is lower than the plane where the barrier filter plate 41 is located.

[0060] S3. Start the drive unit 42 to rotate the filter plate 41 to a vertical position so that the filter plate 41 is pressed against the overflow barrier wall 5 and the clean water discharge system 14 is closed.

[0061] S4. Gas backwashing: Start the air flushing system 2 and open the water inlet system 11. Use the air flushing system 2 to introduce gas into the filter media layer 122, so that the impurities in the filter media layer 122 are flushed to the upper water. Then, under the water sweeping action of the water inlet system 11, the impurities flow along the top of the overflow barrier wall 5 into the drainage system 13 and are discharged through the drainage system 13.

[0062] S5. Start the water flushing system 3 and use the water flushing system 3 to introduce upward flowing clean water into the filter media layer 122. The clean water and the air output from the air flushing system 2 are used together to backwash the filter media layer 122. At this time, the water inlet system 11 is kept open to continuously sweep the upper surface of the filter media layer 122 with water to improve the backwashing effect. Since the overflow barrier wall 5 is equipped with a barrier filter plate 41, the filter media in the filter media layer 122 will not be discharged from the filter tank 121 into the drainage system 13, thus avoiding the loss of filter media.

[0063] S6. After the backwashing is completed and the filter media layer 122 has settled and stabilized, the drainage system 13, air flushing system 2, and water flushing system 3 are closed. The clean water discharge system 14 is opened, and the drive unit 42 is started to make the filter plate 41 rotate to a horizontal position so that the filter tank can carry out normal filtration.

[0064] During backwashing, wastewater in the filter tank 121 of the filter system 12 is filtered and output until the water level of the wastewater is lower than the plane of the barrier filter plate 41. Then, the drive unit 42 is used to rotate the barrier filter plate 41 to a vertical position. During this process, since there is no wastewater above the barrier filter plate 41, the large particles of impurities previously filtered out by the barrier filter plate 41 fall onto the upper surface of the barrier filter plate 41. When the barrier filter plate 41 rotates from a horizontal position to a vertical position, the large particles of impurities on the upper surface of the barrier filter plate 41 are less likely to fall into the filter media layer 122 below the barrier filter plate 41 (falling into the lower filter media layer 122 will prevent the large particles of impurities from being removed by backwashing). This maximizes the chance that the large particles of impurities on the upper surface of the barrier filter plate 41 will be thrown into the drainage system 13 as the barrier filter plate 41 rotates. If wastewater covers the top of the filter plate 41 at this time, when the filter plate 41 rotates, large particles of impurities are easily drawn from the movable end of the filter plate 41 to the lower side of the filter plate 41 under the influence of the wastewater flow, causing these large particles of impurities to be unable to be removed by backwashing.

[0065] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A V-type filter backwashing device, characterized in that, The V-type filter backwashing device includes: The main body of the V-shaped filter includes an inlet system, a filtration system, a drainage system, and a clean water discharge system. The filtration system includes a filter tank containing a filter media layer. The inlet system is located at the top of the filter tank. The drainage system is located on one side of the filter tank, and an overflow barrier wall separates the drainage system from the filter tank. The clean water discharge system is located at the bottom of the filter tank. An air flushing system is provided at the bottom of the filter tank and is used to introduce gas into the bottom of the filter tank. A water flushing system is provided at the bottom of the filter tank, and the water flushing system is used to introduce clean water into the bottom of the filter tank; The filter media barrier includes a barrier filter plate and a drive unit. One end of the barrier filter plate is rotatably mounted on the overflow barrier wall near the filter tank. The shape and area of ​​the barrier filter plate are the same as those of the filter tank, and the diameter of the filter holes in the barrier filter plate is smaller than the diameter of the filter media in the filter media layer. The power output end of the drive unit is connected to the barrier filter plate. When the drive unit drives the barrier filter plate to rotate to a vertical horizontal plane, the top of the barrier filter plate extends beyond the overflow barrier wall. When the barrier filter plate is in a vertical standing state, there is a certain gap between the barrier filter plate and the overflow barrier wall on one side. The bottom of the barrier filter plate is tightly attached to the inner wall of the filter tank. A buffer filter block is provided on the top of the overflow barrier wall near the filter tank. The pore size of the buffer filter block is larger than that of the barrier filter plate. A support platform is provided on the side of the filter tank away from the overflow barrier wall. The support platform is at the same height as the pivot of the barrier filter plate. When the barrier filter plate is lowered, the barrier filter plate abuts against the support platform.

2. The V-type filter backwashing device according to claim 1, characterized in that: The lower layer of the filter tank is provided with a permeable plate, the filter media layer is located above the permeable plate, and the clean water discharge system is connected to the filter tank below the permeable plate through a pipe.

3. The V-type filter backwashing device according to claim 1, characterized in that: The water inlet system includes a V-shaped water inlet trough, which is located above the filter tank, and water inlet holes are evenly distributed at the bottom of the V-shaped water inlet trough.

4. The V-type filter backwashing device according to claim 1, characterized in that: The drainage system includes a drainage trough and a drainage valve, wherein the drainage valve controls the drainage trough to perform drainage operations. The clean water discharge system includes a clean water output pipe, and a clean water output valve is installed on the clean water output pipe.

5. The V-type filter backwashing device according to claim 4, characterized in that: The water flushing system includes a water flushing pump and a water flushing pipe. One end of the water flushing pipe is connected to a clean water tank, and the other end of the water flushing pipe is connected to a clean water output pipe. The connection point between the two is located between the clean water output valve and the filter tank. A water flushing valve is provided on the water flushing pipe. The water flushing pump is connected to the water flushing pipe.

6. The V-type filter backwashing device according to claim 1, characterized in that, The air-impact system includes: air pump; An air-pumping pipe, one end of which is connected to the output end of the air pump, and the other end of which extends into the bottom of the filter tank; An air jet nozzle, the bottom of which is connected to the air jet pipe, and the top of which is inserted into the filter media layer.

7. A V-type filter backwashing device according to claim 6, characterized in that, The air jet nozzle includes: The nozzle body has a frustum-shaped jet end and an airflow channel inside. The jet end has several upward-sloping and outward-radiating air outlets. A one-way valve structure is provided in the airflow channel of the nozzle body, and the one-way valve structure is used to prevent liquid from entering the air jet pipe.

8. A method for backwashing a V-type filter, employing the V-type filter backwashing device described in any one of claims 1-7, characterized in that, The V-type filter backwashing method includes the following steps: S1. Close the water inlet system and stop inputting wastewater into the filter tank; S2. Wait for the filtration system to filter and output the wastewater in the filter tank until the water level of the wastewater is lower than the plane where the barrier filter plate is located. S3. Start the drive unit to rotate the filter plate to a vertical position so that the filter plate is pressed against the overflow barrier wall and the clean water discharge system is shut off. S4. Gas backwashing: Start the air flushing system and open the water inlet system. Use the air flushing system to introduce gas into the filter media layer, so that the impurities in the filter media layer are flushed to the upper water. Then, under the water sweeping action of the water inlet system, the impurities flow along the top of the overflow barrier wall into the drainage system and are discharged through the drainage system. S5. Start the water flushing system. Use the water flushing system to introduce upward-flowing clean water into the filter media layer. The clean water and the air flushing system work together to backwash the filter media layer. At this time, the water inlet system is kept open to continuously sweep the upper surface of the filter media layer with water, which improves the backwashing effect. Because the overflow barrier wall is equipped with a filter plate, the filter media in the filter media layer will not be discharged from the filter tank into the drainage system, thus avoiding the loss of filter media. S6. After backwashing is completed and the filter media layer has settled and stabilized, close the drainage system, air flushing system, and water flushing system, open the clean water discharge system, and start the drive unit to make the filter plate rotate horizontally so that the filter tank can carry out normal filtration.

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