Backwashing system of multi-medium filter

Abstract

The utility model provides a backwashing system of a multi-media filter, which comprises the multi-media filter, a water tank and a cyclone separator, every two of the multi-media filter, the water tank and the cyclone separator are connected through a pipeline, the top end and the bottom end of the multi-media filter are respectively provided with a first water through hole and a second water through hole, and the first water through hole is communicated with the second water through hole. The first water through hole is connected with the cyclone separator, and a backwashing water pump is arranged between the second water through hole and the water tank. According to the backwashing system provided by the utility model, backwashing water subjected to impurity removal through the cyclone separator, the water tank and the security filter meets the backwashing purity requirement, the backwashing water can be recycled, the use amount of the backwashing water is reduced, the cost is reduced, and water resources are saved; the backwashing system is also internally provided with a forward-flushing water passing pipe which is connected with the backwashing water pump in parallel, and forward-flushing cleaning can be carried out on the backwashing system after backwashing by adjusting on-off valves on all pipelines.

Description

Technical Field

[0001] This utility model relates to the field of water treatment equipment technology, and in particular to a backwashing system for a multi-media filter. Background Technology

[0002] In high-tech industries such as silicon wafer manufacturing, the quality of pure water directly affects product performance and quality. Generally, due to the large volume of pure water used, wafer factories often install their own pure water treatment systems to replace purchasing pure water and reduce production costs. These pure water treatment systems typically include multi-media filters to remove turbidity from the raw water.

[0003] Typically, the packing chamber of a multi-media filter is filled with multiple layers of different types of filter media, such as anthracite, quartz sand, and pebbles. A certain amount of flocculant (such as PAC or PAM) may also be added to promote the sedimentation of suspended solids in the water. However, with the use of multi-media filters, the flocculent impurities formed by suspended solids and flocculants will accumulate in each layer of filter media, reducing filtration efficiency and effectiveness. Therefore, backwashing is required to clean the multi-media filter.

[0004] Current backwashing methods typically involve continuously filling a multi-media filter with backwash water, allowing the water to flow against the filtration direction, carrying away flocculent impurities from each filter media until the flocculent impurity content in the effluent at the backwash outlet drops to within acceptable limits. While this backwashing method is simple in layout, it consumes a large amount of water, increasing costs and causing significant waste of water resources. Utility Model Content

[0005] The purpose of this invention is to provide a backwashing system for a multi-media filter to solve the problems in the background art.

[0006] The technical solution of this utility model includes: a backwashing system for a multi-media filter, comprising a multi-media filter, a water tank, and a cyclone separator. The multi-media filter, the water tank, and the cyclone separator are connected in pairs via pipes. The top and bottom ends of the multi-media filter are respectively provided with a first water passage and a second water passage. The first water passage is connected to the cyclone separator, and a backwash water pump is provided between the second water passage and the water tank.

[0007] Specifically, the water tank is provided with a third water passage and a fourth water passage. The third water passage is higher than the fourth water passage. The third water passage is connected to the backwash water pump, and the fourth water passage is connected to the hydrocyclone separator.

[0008] Specifically, the third water inlet and the fourth water inlet are located on opposite side walls of the water tank. The water tank is equipped with an inclined baffle that divides the internal space of the water tank into a first water zone and a second water zone. The first water zone is located between the third water inlet and the inclined baffle, and the second water zone is located between the fourth water inlet and the inclined baffle. The first water zone and the second water zone are connected only at the top.

[0009] Specifically, the second water zone is provided with a first horizontal plate and a second horizontal plate; the first horizontal plate and the second horizontal plate are arranged alternately along the longitudinal direction, one of them is connected to the inclined baffle, and the other is connected to the side wall of the water tank where the fourth water passage is provided; the first horizontal plate and the second horizontal plate divide the second water zone into a vertical S-shaped water channel.

[0010] Specifically, the first and second horizontal plates are provided with a soft layer, which includes a horizontal part and several inclined parts. The inclined parts are located on the water-near side of the horizontal part. When water enters through the fourth water inlet, the water flow direction between the first and second horizontal plates is the backwash direction, and the end of the inclined part away from the horizontal part is inclined against the backwash direction.

[0011] Specifically, the cyclone separator is equipped with a detachable conical filter screen. The wall of the cyclone separator is provided with a fifth water passage, a sixth water passage, and a drain hole. The fifth water passage and the sixth water passage are located at the top of the inner and outer sides of the conical filter screen, respectively, and the drain hole is located at the bottom of the outer side of the conical filter screen.

[0012] Specifically, the backwash system is equipped with a security filter, which has a seventh water passage and an eighth water passage. The seventh water passage is connected to the water tank, and the eighth water passage is connected to the second water passage through the backwash water pump. A forward flushing water pipe is provided between the second water passage and the eighth water passage, and the forward flushing water pipe is connected in parallel with the backwash water pump.

[0013] Specifically, the backwashing system is equipped with an auxiliary separator, which includes a vacuum generator, an acoustic transducer, and / or a heater connected to the multi-media filter.

[0014] Specifically, multiple sets of the acoustic transducer or the heater are provided, each located in the packing chamber of the multi-media filter; in the backwashing system equipped with the heater, a heat exchanger is provided between the cyclone separator and the water tank.

[0015] Specifically, the first water inlet is provided with a positive flushing water inlet pipe, and the output end of the positive flushing water inlet pipe is provided with multiple water distributors, which are distributed above the packing material in the multi-media filter.

[0016] The beneficial effects of this utility model are as follows: the backwash water in this backwash system, after being purified by the cyclone separator, water tank and security filter, meets the purity requirements of backwashing, and can be recycled, reducing the amount of backwash water used, reducing costs and saving water resources; this backwash system is also equipped with a forward flushing water pipe connected in parallel with the backwash water pump, and the backwash system can be forward flushed and cleaned after backwashing by adjusting the on and off valves on each pipe. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an embodiment of the present invention equipped with a vacuum generator;

[0018] Figure 2 This is a schematic diagram of an embodiment of the present invention equipped with an acoustic transducer;

[0019] Figure 3 This is a schematic diagram of an embodiment of the present invention equipped with a heater;

[0020] Figure 4 This is a cross-sectional view of the water tank in an embodiment of this utility model;

[0021] Figure 5 This is a structural diagram of the soft layer in an embodiment of this utility model;

[0022] Figure 6 This is a cross-sectional view of the cyclone separator in an embodiment of this utility model.

[0023] In the diagram: 1. Multi-media filter; 1-1. First water inlet; 1-2. Second water inlet;

[0024] 2. Backwash water pump;

[0025] 3. Water tank; 3-1. Third water passage hole; 3-2. Fourth water passage hole; 3-3. Sloping baffle; 3-4. First water zone; 3-5. Second water zone; 3-6. First horizontal plate; 3-7. Second horizontal plate; 3-8. Soft layer; 3-81. Horizontal part; 3-82. Sloping part;

[0026] 4. Hydrocyclone separator; 4-1. Drain hole; 4-2. Fifth water passage hole; 4-3. Sixth water passage hole; 4-4. Conical filter screen;

[0027] 5. Security filter; 5-1. Seventh water passage; 5-2. Eighth water passage;

[0028] 6. Front flush water pipe;

[0029] 7. Directly flush the water inlet pipe;

[0030] 8. Water distributor;

[0031] 9. Y-type filter;

[0032] 10. Vacuum generator;

[0033] 11. Acoustic transducer;

[0034] 12. Heater;

[0035] 13. Heat exchanger. Detailed Implementation

[0036] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] Reference Appendix Figure 1-6This embodiment provides a backwashing system for a multi-media filter, comprising a multi-media filter 1, a backwash water pump 2, a water tank 3, and a hydrocyclone 4 connected sequentially by pipes. The multi-media filter 1 and the hydrocyclone 4 are directly connected by pipes. During backwashing, the backwash water pump 2 sends backwash water from the water tank 3 to the multi-media filter 1, causing the backwash water to flow against the filtration direction in the multi-media filter 1. The backwash water carries flocculent impurities from the packing chamber into the hydrocyclone 4 through the pipes. The hydrocyclone 4 separates the backwash water from the flocculent impurities, and the flocculent impurities are deposited in the hydrocyclone 4. The backwash water flows into the water tank 3, and the above cycle is repeated to backwash the multi-media filter 1.

[0040] By adopting the above technical solution, the cyclone separator 4 separates the flocculent impurities and backwash water, so that the backwash water can be reused and the multi-media filter 1 can be backwashed multiple times, saving the total water consumption for equipment backwashing, reducing costs and conserving water resources.

[0041] Generally, the pore size of the packing material in the multi-media filter 1 gradually decreases from top to bottom, and the filtration direction is from top to bottom. To minimize structural modifications to the multi-media filter 1, the backwash water flow direction is configured from bottom to top. Therefore, a first water passage 1-1 is set at the top of the multi-media filter 1, and a second water passage 1-2 is set at the bottom of the multi-media filter 1. The first water passage 1-1 is connected to the hydrocyclone 4 through a pipe, and the second water passage 1-2 is connected to the backwash water pump 2 through a pipe. The backwash water pump 2 is used to transport the backwash water to the bottom of the multi-media filter 1. After backwashing layer by layer, the flocculent impurities and the backwash water enter the hydrocyclone 4 together through the first water passage 1-1.

[0042] Because the specific gravity difference between flocculent impurities and backwash water is small, a small amount of flocculent impurities are inevitable in the backwash water exiting the hydrocyclone separator 4. However, the backwash water flows from bottom to top in the multi-media filter 1, and the pores of the packing material closer to the bottom of the multi-media filter 1 are smaller. These flocculent impurities from the previous backwash cannot pass through the small-pore packing material and flow to the first water inlet 1-1 during the next backwash. These flocculent impurities will undoubtedly accumulate in the packing material at the bottom of the multi-media filter 1, thus reducing the quality of the effluent during normal filtration. Therefore, in this embodiment, the water inlet of the water tank 3 is... The design incorporates a height difference: the water tank 3 has a third water passage 3-1 and a fourth water passage 3-2. The third water passage 3-1 is higher than the fourth water passage 3-2. The third water passage 3-1 is connected to the backwash water pump 2 through a pipe, and the fourth water passage 3-2 is connected to the hydrocyclone 4 through a pipe. During backwashing, the backwash water output from the hydrocyclone 4 enters the water tank 3 through the fourth water passage 3-2. Under the action of gravity, some flocculent impurities settle to the bottom of the water tank 3. When the height of the backwash water in the water tank 3 reaches the position of the third water passage 3-1, the backwash water can be pumped away by the backwash water pump 2.

[0043] If flocculent impurities and backwash water are separated by gravity in water tank 3, the effect is not satisfactory. (See attached diagram.) Figure 4 An inclined baffle 3-3 can be added inside the water tank 3, with the third water passage 3-1 and the fourth water passage 3-2 respectively positioned on opposite side walls of the water tank 3. The bottom end of the inclined baffle 3-3 is located below the third water passage 3-1, and the top end of the inclined baffle 3-3 extends towards the area between the top plate and the fourth water passage 3-2. The bottom and side edges of the inclined baffle 3-3 are sealed to the inner bottom and inner side walls of the water tank 3, respectively. In other words, the inclined baffle 3-3 divides the internal space of the water tank 3 into two areas—the first water area 3-5 located between the inclined baffle 3-3 and the third water passage 3-1, and... The second water zone is located between the inclined baffle 3-3 and the fourth water passage 3-2, and the first water zone 3-5 and the second water zone are only connected at the top. In this way, when the backwash water in the second water zone is full, the backwash water flows into the first water zone 3-5 along the inclined baffle 3-3. When the backwash water in the first water zone 3-5 is full, it enters the backwash water pump 2 through the third water passage 3-1. By increasing the number of separations by gravity (i.e., from the original 1 time to 2 times), the separation effect of flocculent impurities and backwash water in the water tank 3 is improved, and the content of flocculent impurities in the backwash water exiting from the third water passage 3-1 is reduced.

[0044] If the above-mentioned technical solutions are insufficient to separate flocculent impurities and backwash water in water tank 3, then a first horizontal plate 3-6 and a second horizontal plate 3-7 can be installed in the second water zone (see attached diagram). Figure 4 The first horizontal plate 3-6 and the second horizontal plate 3-7 are arranged alternately along the longitudinal direction. One of them is connected to the inclined baffle 3-3, and the other is connected to the side wall of the water tank 3, which is provided with the fourth water passage 3-2. The first horizontal plate 3-6 and the second horizontal plate 3-7 divide the second water zone into vertical S-shaped water channels. The vertical S-shaped water channels increase the flow path length of the backwash water in the second water zone, prolong its residence time in the second water zone, prolong the settling time of flocculent impurities, and increase the area for receiving settling flocculent impurities through the first horizontal plate 3-6 and the second horizontal plate 3-7, thereby increasing the amount of flocculent impurities that can be received at different heights, reducing the content of flocculent impurities in the backwash water flowing to the first water zone 3-5, and thus reducing the content of flocculent impurities in the backwash water exiting from the third water passage 3-1.

[0045] If the above technical solutions alone are insufficient to separate flocculent impurities and backwash water in water tank 3, please refer to the appendix. Figure 4 and 5A soft layer 3-8 (e.g., PFA material) can also be provided on the first horizontal plate 3-6 and the second horizontal plate 3-7. The soft layer 3-8 includes a horizontal part 3-81 and several inclined parts 3-82. The horizontal part 3-81 is attached to the surface of the first horizontal plate 3-6 and the second horizontal plate 3-7. Several inclined parts 3-82 are inclined on the water-near side of the horizontal part 3-81. The inclined direction is: the end of the inclined part 3-82 away from the horizontal part 3-81 is inclined against the backwash flow direction (the backwash flow direction is the flow direction of the backwash water). Its function is to increase the turbulence of the backwash water between the first horizontal plate 3-6 and the second horizontal plate 3-7, retain flocculent impurities in the second water zone to the greatest extent, reduce the content of flocculent impurities in the backwash water flowing to the first water zone 3-5, and thus reduce the content of flocculent impurities in the backwash water exiting from the third water passage 3-1.

[0046] The basic structure of the cyclone separator 4 used in this backwashing system is existing technology, as shown in the attached figure. Figure 6 As shown, the basic structure of the hydrocyclone 4 is an inverted cone shape. It has a drain hole 4-1 at the bottom and a fifth water inlet 4-2 and a sixth water inlet 4-3 at the top. The fifth water inlet 4-2 is located on the side wall of the hydrocyclone 4 and is horizontally oriented. The sixth water inlet 4-3 is located on the top wall of the hydrocyclone 4 and is vertically oriented. The fifth water inlet 4-2 serves as the inlet for backwash water, connected to the first water inlet 1-1 of the multi-media filter 1 via a pipe. The sixth water inlet 4-3 serves as the outlet for backwash water, connected to the fourth water inlet 3-2 of the water tank 3 via a pipe. After exiting the multi-media filter 1, the backwash water enters the hydrocyclone 4 horizontally through the fifth water inlet 4-2, forming a vortex within the hydrocyclone 4. Under centrifugal force, flocculent impurities are separated from the backwash water. The heavier flocculent impurities settle at the bottom of the hydrocyclone 4, while the lighter backwash water flows out through the sixth water inlet 4-3.

[0047] Because the specific gravity difference between flocculent impurities and backwash water is small, the separation effect of using the basic structure of the cyclone separator 4 is sometimes not satisfactory. Therefore, in this embodiment, a detachable conical filter screen 4-4 (bottomless) is constructed in the cyclone separator 4. The shape of the conical filter screen 4-4 is similar to that of the cyclone separator 4 and is constructed in the same direction, but the radial dimension of the conical filter screen 4-4 is smaller than that of the cyclone separator 4. The fifth water passage 4-2 and the drain hole 4-1 are located on the outside of the conical filter screen 4-4, and the sixth water passage 4-3 is located on the inside of the conical filter screen 4-4. When the backwash water enters the cyclone separator 4 through the fifth water passage 4-2, the large-diameter flocculent impurities cannot pass through the conical filter screen 4-4 and gradually settle at the bottom of the cyclone separator 4. Under the dual action of cyclone and filtration, the separation effect of flocculent impurities and backwash water in the cyclone separator 4 is improved.

[0048] The dimensions of each of the above structures can be configured according to actual usage requirements. For example, the inclination of the inclined baffle 3-3 in water tank 3 is better between 30° and 60°, and 45° is even better; the radial dimension of the vertical S-shaped water channel is better if it is equal to the diameter of the fourth water passage 3-2; the pipe outside the fifth water passage 4-2 adopts a variable diameter method to increase the flow velocity of the backwash water when it enters the cyclone separator 4, which is even better; the distance between the conical filter screen 4-4 and the inner wall of the cyclone separator 4 is better if it is equal to the diameter of the fifth water passage 4-2.

[0049] Generally, after treatment by the improved cyclone separator 4 and the water tank 3 with the above-mentioned structure, the impurities in the backwash water can be reduced to a relatively low level. However, if it is to be further ensured that flocculent impurities will not enter the bottom layer of the packing in the multi-media filter 1 through the second water passage 1-2 and affect the normal filtration quality, a security filter 5 can be set in the backwash system. An additional filtration process is performed after the water tank 3, and the security filter 5 is used to further remove flocculent impurities in the backwash water. The structure of the security filter 5 is existing technology and will not be described in detail here. The security filter 5 is provided with a seventh water passage 5-1 and an eighth water passage 5-2. The seventh water passage 5-1 is connected to the water tank 3, and the eighth water passage 5-2 is connected to the second water passage 1-2 through the backwash water pump 2. A forward flushing water pipe 6 is also provided between the second water passage 1-2 and the eighth water passage 5-2. The forward flushing water pipe 6 is connected in parallel with the backwash water pump 2.

[0050] The purpose of adding the forward flushing water pipe 6 is to perform a forward flush on the multi-media filter 1 in the opposite direction of backwashing before it is put into formal operation after the backwashing process is completed. The forward flushing water enters from the top of the multi-media filter 1, flows through each packing layer in sequence, and enters the security filter 5 through the forward flushing water pipe 6. The flocculent impurities filtered out by the security filter 5 during the backwashing process are flushed into the water tank 3 and carried into the hydrocyclone separator 4 along with the flocculent impurities that settle in the water tank 3 during the backwashing process. The forward flushing water and the flocculent impurities flushed over fall from the top to the bottom of the hydrocyclone separator 4, and the flocculent impurities that settle at the bottom of the hydrocyclone separator 4 during backwashing are flushed out through the drain hole 4-1, completing the cleaning of the backwashing system for the next use.

[0051] During implementation, a forward flushing inlet pipe 7 can be installed on the first water inlet 1-1 of the multi-media filter 1. Multiple water distributors 8 are installed at the output end of the forward flushing inlet pipe 7. The multiple water distributors 8 are distributed above the packing in the multi-media filter 1, so that the forward flushing water is evenly sprayed onto the packing, and the impurities remaining on the packing by the backwash water are fully flushed, thereby improving the forward flushing effect.

[0052] In addition, a Y-type filter 9 can be installed at the outlet of the backwash water pump 2 to further ensure the removal of impurities from the backwash water.

[0053] Reference Appendix Figure 1-3 An auxiliary separator can also be added to the backwashing system. The auxiliary separator is at least one of a vacuum generator 10, an acoustic transducer 11, and a heater 12 connected to the multi-media filter 1. The vacuum generator 10 should be located outside the multi-media filter 1, and the acoustic transducer 11 and the heater 12 should be located in the packing compartment of the multi-media filter 1 to improve the auxiliary separation effect.

[0054] Before backwashing, evacuating the multi-media filter 1 and maintaining it in a vacuum state for a period of time can improve the desorption efficiency of the packing material and flocculent impurities. Vibrating the packing material using the acoustic transducer 11 and heating the packing material using the heater 12 can both help improve the desorption efficiency of the packing material and flocculent impurities and improve the backwashing effect.

[0055] In this embodiment, the vacuum generator 10, the acoustic transducer 11, and the heater 12 are all existing technologies, and models can be selected according to actual needs. Their specific structures, installation matters, and functions are not described in detail.

[0056] When a heater 12 is installed in the multi-media filter 1, a heat exchanger 13 (e.g., a plate heat exchanger 13) can be installed between the cyclone separator 4 and the water tank 3. The heat exchanger 13 can be connected to other heat-using systems or equipment in the plant, allowing the heat energy of the high-temperature backwash water from the multi-media filter 1 to be recycled. After impurities are removed by the cyclone separator 4, the backwash water is introduced into the heat exchanger 13, which can prevent pipe blockage in the heat exchanger 13 and avoid the waste of heat from the backwash water.

[0057] It is worth noting that, as is known and necessary, all pipelines in this backwashing system are equipped with independent on / off valves. This ensures the safety of equipment and personnel, and also prevents backwashing, forward rinsing, and filtration processes from interfering with each other. If necessary, flow meters and pressure valves can be installed on some pipelines to ensure safety and the proper execution of the backwashing and forward rinsing processes. Alternatively, on / off valves, flow meters, pressure valves, and backwash pump 2 with remote transmission capabilities can be selected, along with a programmable central control unit, to improve the automation level of the backwashing system. Personnel can also remotely monitor the operating status and equipment safety.

[0058] To clearly illustrate the operation of this backwashing system, the backwashing and forward rinsing processes will be described in detail below using a backwashing system equipped with a vacuum generator 10.

[0059] During backwashing: Close the on / off valves on the outside of the first water inlet 1-1 and the second water inlet 1-2 of the multi-media filter 1. Use the vacuum generator 10 to evacuate the packing chamber of the multi-media filter 1, and maintain the packing chamber under negative pressure for a period of time to allow flocculent impurities to be expelled from the packing. Open the vent valve on the multi-media filter 1 (existing technology, configured in conjunction with the vacuum generator 10 to ensure equipment safety) to restore the packing chamber to normal pressure. Open the on / off valve on the pipeline between the first water inlet 1-1 and the cyclone separator 4, and the on / off valve on the pipeline between the second water inlet 1-2 and the backwash water pump. The on / off valves between pipes 2 and 2, between backwash water pump 2 and security filter 5, between security filter 5 and water tank 3, and between water tank 3 and cyclone separator 4 (i.e., closing the on / off valves on the forward flushing inlet pipe 7 and forward flushing outlet pipe 6, and closing the drain hole 4-1 of cyclone separator 4) are used to backwash the multi-media filter 1 in the following flow direction: water tank 3 → security filter 5 → backwash water pump 2 → multi-media filter 1 → cyclone separator 4 → water tank 3. The number of backwash cycles is set according to the specific implementation conditions and experience.

[0060] Once backwashing is complete, forward rinsing can begin.

[0061] During forward flushing: Based on the on / off valve status during the backwashing process, open the on / off valves on the forward flushing inlet pipe 7 and the forward flushing outlet pipe 6, open the drain hole 4-1 of the cyclone separator 4, close the on / off valves on the pipe between the first water outlet 1-1 and the cyclone separator 4, and close the on / off valves at both ends of the backwash water pump 2. The forward flushing water flows in the following direction to perform forward flushing on the backwashing system: multi-media filter 1 → security filter 5 → water tank 3 → cyclone separator 4, and finally discharges the wastewater through the drain hole 4-1.

[0062] Compared with the prior art, the beneficial effects of this utility model are as follows: the backwash water in this backwash system, after being purified by the cyclone separator 4, water tank 3 and security filter 5, meets the purity requirements of backwashing, and can be recycled, reducing the amount of backwash water used, reducing costs and saving water resources; this backwash system is also equipped with a forward flushing water pipe 6 connected in parallel with the backwash water pump 2, and the backwash system can be forward flushed and cleaned after backwashing by adjusting the on / off valves on each pipe.

[0063] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A backwashing system for a multi-media filter, characterized in that, The device includes a multi-media filter, a water tank, and a cyclone separator. Each of the multi-media filter, the water tank, and the cyclone separator is connected to the other two by pipes. The multi-media filter has a first water inlet and a second water inlet at its top and bottom ends, respectively. The first water inlet is connected to the cyclone separator, and a backwash water pump is provided between the second water inlet and the water tank.

2. The backwashing system for the multi-media filter according to claim 1, characterized in that, The water tank is provided with a third water passage and a fourth water passage. The third water passage is higher than the fourth water passage. The third water passage is connected to the backwash water pump, and the fourth water passage is connected to the hydrocyclone separator.

3. The backwashing system for the multi-media filter according to claim 2, characterized in that, The third and fourth water passages are located on opposite side walls of the water tank. The water tank is equipped with an inclined baffle that divides the internal space of the water tank into a first water zone and a second water zone. The first water zone is located between the third water passage and the inclined baffle, and the second water zone is located between the fourth water passage and the inclined baffle. The first water zone and the second water zone are connected only at the top.

4. The backwashing system for a multi-media filter according to claim 3, characterized in that, The second water zone is provided with a first horizontal plate and a second horizontal plate; the first horizontal plate and the second horizontal plate are arranged alternately along the longitudinal direction, one of them is connected to the inclined baffle, and the other is connected to the side wall of the water tank where the fourth water passage is provided; the first horizontal plate and the second horizontal plate divide the second water zone into a vertical S-shaped water channel.

5. The backwashing system for a multi-media filter according to claim 4, characterized in that, The first and second horizontal plates are provided with a soft layer, which includes a horizontal part and several inclined parts. The inclined parts are located on the water-near side of the horizontal part. When water enters through the fourth water inlet, the water flow direction between the first and second horizontal plates is the backwash direction, and the end of the inclined part away from the horizontal part is inclined against the backwash direction.

6. The backwashing system for a multi-media filter according to any one of claims 1-5, characterized in that, The cyclone separator is equipped with a detachable conical filter screen. The wall of the cyclone separator is provided with a fifth water passage, a sixth water passage, and a drain hole. The fifth water passage and the sixth water passage are located at the top of the inner and outer sides of the conical filter screen, respectively, and the drain hole is located at the bottom of the outer side of the conical filter screen.

7. The backwashing system for a multi-media filter according to claim 6, characterized in that, The backwash system is equipped with a security filter, which has a seventh water passage and an eighth water passage. The seventh water passage is connected to the water tank, and the eighth water passage is connected to the second water passage through the backwash water pump. A forward flushing water pipe is provided between the second water passage and the eighth water passage, and the forward flushing water pipe is connected in parallel with the backwash water pump.

8. The backwashing system for a multi-media filter according to any one of claims 1-5, 7, characterized in that, The backwashing system is equipped with an auxiliary separator, which includes a vacuum generator, an acoustic transducer, and / or a heater connected to the multi-media filter.

9. The backwashing system for a multi-media filter according to claim 8, characterized in that, Multiple sets of the acoustic transducer or the heater are located in the packing chamber of the multi-media filter; in the backwashing system equipped with the heater, a heat exchanger is provided between the cyclone separator and the water tank.

10. The backwashing system for a multi-media filter according to any one of claims 1-5, 7, and 9, characterized in that, The first water inlet is provided with a positive flushing water inlet pipe, and the output end of the positive flushing water inlet pipe is provided with multiple water distributors, which are distributed above the packing material in the multi-media filter.

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