A multi-media low resistance horizontal filter

Abstract

The utility model provides a kind of multi-medium low-resistance horizontal filter, including shell, filter material and water distribution pipe group are arranged in the shell, the filter material is arranged in the middle part in the height direction of the shell, and the water distribution pipe group is arranged above the filter material;Water inlet line is connected in the upper part in the height direction of the shell, and the water distribution pipe group is communicated with the water inlet line;Water outlet line is communicated in the lower part in the height direction of the shell;Raw water enters the filter material through the water inlet line and the water distribution pipe group in turn, and filtered qualified water enters pipe network through water outlet line and is treated again by subsequent reverse osmosis module.The filter effectively improves the filter construction installation efficiency, can realize large-scale construction layout, effectively reduces the cost, solves the problems of original concrete filter tank needing civil construction operation, large workload and long cycle, and has good social and economic benefits.

Description

Technical Field

[0001] This utility model relates to the field of seawater desalination and water treatment technology, and in particular to a multi-media low-resistance horizontal filter. Background Technology

[0002] Reverse osmosis membrane technology is widely used in large-scale water treatment fields such as seawater desalination. Its principle is to apply a pressure greater than the natural osmotic pressure to saline water, so that the osmosis proceeds in the opposite direction, forcing water molecules in the raw water to the other side of the membrane, turning it into pure water, thereby achieving the purpose of removing salt from the water and effectively removing dissolved salts, colloids, microorganisms, organic matter, etc. from the water.

[0003] Reverse osmosis membrane technology typically involves flocculation and filtration processes before the concrete filter bed. The construction of concrete filter beds generally requires a large amount of civil engineering work, consuming a lot of manpower and resources. Furthermore, if the concrete filter bed needs to be upgraded, the renovation cost is enormous. Utility Model Content

[0004] The purpose of this utility model is to provide a multi-media low-resistance horizontal filter that can effectively replace the original concrete filter tank. The filter is manufactured entirely in the factory, which greatly reduces on-site civil construction work, effectively shortens the on-site construction period, improves efficiency, enables large-scale application, and ensures product quality, thus having good social and economic benefits.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A multi-media low-resistance horizontal filter includes a housing, wherein filter media and a water distribution pipe assembly are disposed within the housing. The filter media is disposed in the middle of the housing in the height direction, and the water distribution pipe assembly is disposed above the filter media. An inlet pipe is connected to the upper part of the housing in the height direction, and the water distribution pipe assembly is connected to the inlet pipe. A product water pipe is connected to the lower part of the housing in the height direction. Raw water sequentially enters the filter media through the inlet pipe and the water distribution pipe assembly, and the filtered qualified water enters the pipeline network through the product water pipe and is further treated by a subsequent reverse osmosis module.

[0007] Furthermore, in the aforementioned multi-media low-resistance horizontal filter, the housing is a hollow cylindrical body, the housing is installed horizontally, the axis of the housing is parallel to the ground, and the housing is made of fiberglass or carbon steel lined with rubber; a support is provided at the lower end of the housing, two supports 14 are provided, and the supports are symmetrically arranged below the housing; the filter media includes upper and lower filter layers, the filter media of the lower filter layer is quartz sand, and the filter media of the upper filter layer is anthracite or activated carbon; a filter plate is provided below the filter media; the filter plate is provided with air inlet holes and water inlet and outlet holes.

[0008] Furthermore, in the aforementioned multi-media low-resistance horizontal filter, the water distribution pipe assembly includes one or two water distribution pipes. The axis of the water distribution pipe is parallel to the axis along the length of the housing. Each water distribution pipe has several openings evenly distributed on it. After the raw water enters the water distribution pipe through the inlet pipe, the water distribution pipe distributes the raw water into the filter media through the openings. The inlet pipe includes a vertical section and a horizontal section. The lower end of the vertical section is located in the middle of the height direction of the housing. The horizontal section is horizontally arranged in the upper middle part of the housing. The upper end of the vertical section is connected to the middle of the horizontal section. Both ends of the horizontal section pass through the housing and are connected to the water distribution pipe assembly. The lower end of the vertical section is connected to a raw water inlet and a flushing water outlet. The product water pipe is connected to a product water outlet and a flushing water inlet. The material of the water distribution pipe assembly is fiberglass.

[0009] Furthermore, the aforementioned multi-media low-resistance horizontal filter also includes an air washing pipeline and an air distribution pipe assembly. The upper end of the air washing pipeline is located above the housing, and an air inlet is provided at the upper end of the air washing pipeline. The air distribution pipe assembly is disposed inside the housing, located below the filter plate, and the lower end of the air washing pipeline passes through the housing and communicates with the air distribution pipe assembly. The air distribution pipe assembly includes 1 to 2 air distribution pipes, the axis of which is parallel to the axis along the length of the housing, and an exhaust port is provided at the top of the housing. The air distribution pipe assembly is made of fiberglass.

[0010] Furthermore, the above-mentioned multi-media low-resistance horizontal filter also includes a primary filtrate discharge pipe. The primary filtrate discharge pipe is connected to the lower end of the shell and is located in the middle of the length direction of the shell. The primary filtrate discharge pipe has a primary filtrate outlet. After backwashing, the unqualified product water from the initial filtration passes through the primary filtrate discharge pipe and is discharged from the primary filtrate outlet into the wastewater network.

[0011] Furthermore, in the aforementioned multi-media low-resistance horizontal filter, the filter plate is provided with a plurality of filter cap assemblies, wherein the filter cap assemblies are arranged at a ratio of 40-50 per m. 2 The air distribution pipe is provided with a number of evenly spaced openings; the distance between the lower end of the filter plate and the lower end of the filter cap assembly is 300mm-400mm; the filter cap assembly serves as both the air inlet and the water inlet / outlet on the filter plate.

[0012] Furthermore, in the above-mentioned multi-media low-resistance horizontal filter, several rows of filter cap assemblies are arranged on the filter plate along the axial direction of the housing. Each row of filter cap assemblies is arranged radially along the housing, and several filter cap assemblies are arranged in each row. The filter cap assemblies are used as the water inlet and outlet holes on the filter plate. A row of air inlet holes is arranged on the filter plate between two adjacent rows of filter cap assemblies. The air distribution pipe group also includes several horizontal pipes arranged radially along the housing. The horizontal pipes are arranged horizontally, and the several horizontal pipes are arranged sequentially along the axial direction of the housing. The horizontal pipes are connected to the air distribution pipe through flexible hoses. Each row of air inlet holes is connected to the horizontal pipe through a small pipe.

[0013] Furthermore, in the aforementioned multi-media low-resistance horizontal filter, the filter plate includes several sub-plates arranged radially along the shell. These sub-plates are connected sequentially, and the resulting filter plate, after splicing, has a serrated cross-section along the axial direction of the shell. The included angle between adjacent sub-plates is 45°. Several air inlets are evenly distributed along the length of each sub-plate. The air distribution pipe assembly also includes several horizontal pipes arranged radially along the shell. These horizontal pipes are horizontally positioned and arranged sequentially along the axial direction of the shell. The horizontal pipes are connected to the air distribution pipes via flexible hoses. The air inlets on adjacent sub-plates are connected to the horizontal pipes via small tubes. Several through holes are evenly formed along the length of each sub-plate. The height of the through holes is lower than the height of the air inlets, and these through holes serve as the water inlet and outlet holes on the filter plate. A stone pad layer, composed of pebbles or garnet, is provided between the filter plate and the filter media.

[0014] Furthermore, in the above-mentioned multi-media low-resistance horizontal filter, the inlet and outlet holes are elongated holes, the center line of the inlet and outlet holes along the length direction is perpendicular to the axis of the shell, and several inlet and outlet holes are arranged sequentially along the axial direction of the shell. A row of air inlets arranged radially along the shell is provided between two adjacent inlet and outlet holes. A stone pad layer is provided between the filter plate and the filter media, and the stone pad layer is made of pebbles or garnets. The air distribution pipe assembly also includes several horizontal pipes arranged radially along the shell. The horizontal pipes are arranged horizontally, and several horizontal pipes are arranged sequentially along the axial direction of the shell. The horizontal pipes are connected to the air distribution pipes through flexible hoses, and the air inlets between two adjacent inlet and outlet holes are all connected to the horizontal pipes through small pipes.

[0015] Furthermore, in the above-mentioned multi-media low-resistance horizontal filter, differential pressure measuring instruments are installed on both the inlet pipe and the product water pipe, and a valve is installed on the product water pipe. The differential pressure measuring instrument is interlocked with the valve to achieve stable production of product water.

[0016] Analysis shows that this utility model discloses a multi-media low-resistance horizontal filter, which is suitable for the water treatment field, especially for large-scale seawater desalination. The filter is manufactured and assembled in the factory, and modular assembly is achieved on site, which effectively improves the efficiency of filter construction and installation, enables large-scale construction and layout, effectively reduces costs, and solves the problems of the original concrete filter tank requiring civil construction work, large workload and long cycle, and has good social and economic benefits. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0018] Figure 1 This is a cross-sectional structural diagram of an embodiment of the present invention.

[0019] Figure 2 This is a structural schematic diagram of an embodiment of the present utility model.

[0020] Figure 3 for Figure 2 A schematic diagram of the left-side view structure.

[0021] Figure 4 This is a schematic diagram of the assembly of the air distribution pipe assembly and the filter plate according to another embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the assembly of the air distribution pipe assembly and the filter plate according to another embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the assembly of the air distribution pipe assembly and the filter plate in another embodiment of the present invention.

[0024] Explanation of reference numerals in the attached drawings: 10 Shell; 11 Vent; 12 Filter media; 13 Filter plate; 14 Support; 20 Inlet water pipe; 21 Raw water inlet; 22 Rinse water outlet; 23 Water distribution pipe assembly; 24 Horizontal section; 25 Vertical section; 30 Product water pipe; 31 Product water outlet; 32 Rinse water inlet; 40 Air washing pipe; 41 Air inlet; 42 Air distribution pipe; 50 Primary filtrate discharge pipe; 51 Primary filtrate outlet; 60 Filter cap assembly; 61 Horizontal pipe; 62 Flexible hose; 63 Small pipe; 64 Through hole; 65 Narrow hole; 66 Pad stone layer. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0026] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0027] The accompanying drawings illustrate one or more examples of the present invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the present invention. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0028] like Figures 1 to 6 As shown, according to an embodiment of this utility model, a multi-media low-resistance horizontal filter is provided, such as... Figure 1As shown, the filter includes a housing 10, within which filter media 12 and a water distribution pipe assembly 23 are disposed. The filter media 12 is located in the middle of the housing 10 in the height direction, and the water distribution pipe assembly 23 is located above the filter media 12. An inlet pipe 20 is connected to the upper part of the housing 10 in the height direction, and the water distribution pipe assembly 23 is connected to the inlet pipe 20. A product water pipe 30 is connected to the lower part of the housing 10 in the height direction. Raw water, such as seawater, sequentially enters the filter media 12 within the housing 10 through the inlet pipe 20 and the water distribution pipe assembly 23. After being filtered by the filter media 12, impurities, colloids, viruses, etc., in the raw water are adsorbed and removed by the filter media, producing qualified filtered water. The qualified filtered water enters the pipeline network through the product water pipe 30 and is further treated by a subsequent reverse osmosis module. This filter is suitable for the water treatment field, especially for large-scale seawater desalination, and can effectively replace the concrete filter tanks in existing technologies. All filter components are manufactured and assembled in the factory, greatly reducing on-site civil construction work. On-site modular assembly enables large-scale application, effectively improving the efficiency of filter construction and installation, shortening the on-site construction period, reducing costs, and ensuring product quality. It solves the problems of traditional concrete filter tanks that require civil construction work, which involves a large workload and a long cycle, and has good social and economic benefits.

[0029] Furthermore, the housing 10 is a hollow cylindrical body, installed horizontally with its axis parallel to the ground. The housing 10 is made of fiberglass or carbon steel lined with rubber to enhance its corrosion resistance and ensure high structural strength, thus extending the filter's service life. Two supports 14 are symmetrically positioned at the lower end of the housing 10 to ensure stable filter operation.

[0030] The filter media 12 comprises upper and lower filter layers. The lower filter layer contains quartz sand, and the upper filter layer contains anthracite or activated carbon. A filter plate 13 is disposed below the filter media 12. The filter plate has air inlet holes and water inlet / outlet holes. When the filter filters raw water, the filtered raw water is discharged through the water inlet / outlet holes. During gas backwashing, gas enters the filter media 12 through the air inlet holes on the filter plate 13. During water backwashing, backwash water enters the filter media 12 through the water inlet / outlet holes on the filter plate 13. Further, as... Figure 2As shown, the water distribution pipe assembly 23 includes 1 to 2 water distribution pipes. The axis of the water distribution pipe is parallel to the axis of the length direction of the housing 10. Several openings are evenly opened on each water distribution pipe so that the raw water entering the water distribution pipe assembly 23 can be evenly distributed in the filter media 12. After the raw water enters the water distribution pipe through the water inlet pipe 20, the water distribution pipe distributes the raw water into the filter media 12 through the openings. The inlet pipe 20 includes a vertical section 25 and a horizontal section 24. The lower end of the vertical section 25 is located in the middle of the height direction of the shell 10. The horizontal section 24 is horizontally arranged in the upper middle part of the shell 10. The upper end of the vertical section 25 is connected to the middle of the horizontal section 24. The two ends of the horizontal section 24 pass through the shell 10 and are connected to the water distribution pipe group 23. The lower end of the vertical section 25 is connected to the raw water inlet 21 and the flushing water outlet 22. The product water pipe 30 is connected to the product water outlet 31 and the flushing water inlet 32. During water washing and backwashing, the backwash water passes through the flushing water inlet 32, the product water pipe 30, and the inlet and outlet holes on the filter plate 13 in sequence before entering the filter media 12 for backwashing. The backwash water after backwashing the filter media 12 enters the inlet pipe 20 through the water distribution pipe group 23 and is discharged through the flushing water outlet 22. The material of the water distribution pipe group 23 is fiberglass.

[0031] Furthermore, the filter also includes an air washing pipeline 40 and an air distribution pipe assembly. The upper end of the air washing pipeline 40 is located above the housing 10, and an air inlet 41 is provided at the upper end of the air washing pipeline 40. The air distribution pipe assembly is located inside the housing 10, below the filter plate 13. The lower end of the air washing pipeline 40 passes through the housing 10 and connects to the air distribution pipe assembly. The air distribution pipe assembly includes one or two air distribution pipes 42, the axis of which is parallel to the axis along the length of the housing 10. An exhaust port 11 is provided at the top of the housing 10. The air distribution pipe assembly is made of fiberglass. During gas backwashing, the gas enters the filter media 12 sequentially through the air inlet 41, the air washing pipeline 40, the air distribution pipe assembly, and the air inlet on the filter plate 13, and finally exits through the exhaust port 11.

[0032] Furthermore, such as Figure 3 As shown, the filter also includes a pre-filter discharge pipe 50, which is connected to the lower end of the housing 10. The connection between the pre-filter discharge pipe 50 and the housing 10 is located at the lowest point of the housing 10. The pre-filter discharge pipe 50 is located in the middle of the length direction of the housing 10 and has a pre-filter outlet 51. After backwashing, the permeate from the initial filtration passes through the pre-filter discharge pipe 50 and is discharged from the pre-filter outlet 51 into the wastewater network to ensure product quality. When the filtered water meets the standards, the pre-filter outlet 51 is closed, and the valve of the permeate pipe 30 is opened. The filtered water enters the network through the permeate pipe 30 and is then further processed by the subsequent reverse osmosis module.

[0033] Furthermore, differential pressure measuring instruments are installed on both the inlet pipe 20 and the product water pipe 30, and a valve is installed on the product water pipe 30. The differential pressure measuring instruments are interlocked with the valve to achieve stable production of product water.

[0034] In one embodiment of this utility model, the filter housing is made of fiberglass, as are the air distribution pipe assembly and water distribution pipe assembly. The filter media consists of quartz sand and activated carbon. The water distribution pipe assembly 23 has two water distribution pipes, and the air distribution pipe assembly has two air distribution pipes 42. This filter adopts a horizontal design combined with the parallel arrangement of the two water distribution pipes, which, along with the perforations, evenly distributes the water flow. The parallel arrangement of the two air distribution pipes, along with the perforations, evenly distributes the airflow, and the low-resistance filter cap reduces system resistance.

[0035] The filter plate 13 is provided with several filter cap assemblies 60, with 40-50 filter cap assemblies per m. 2 The air distribution pipe 42 is equipped with several evenly spaced openings; the filter cap assembly 60 serves as both an air inlet and a water outlet on the filter plate 13. The distance between the lower end of the filter plate 13 and the lower end of the air inlet of the filter cap assembly 60 is 300mm-400mm. This arrangement allows the backwash gas below the filter plate 13 to form a gas layer of a certain thickness, ensuring the backwashing effect. The filter cap assembly 60 achieves a uniform distribution of backwash airflow and backwash water flow, ensuring a stable flow field distribution inside the filter and avoiding filter media disturbance caused by localized scouring. During the raw water filtration stage, the filter cap assembly 60 performs the water collection function, orderly guiding the filtered water into the space below the filter plate 13.

[0036] Furthermore, such as Figure 4 As shown, in another embodiment of this utility model, several rows of filter cap assemblies 60 are arranged on the filter plate 13 along the axial direction of the housing 10. Each row of filter cap assemblies 60 is arranged radially along the housing, and several filter cap assemblies 60 are arranged in each row. The filter cap assemblies 60 serve as water inlet and outlet holes on the filter plate 13. A row of air inlet holes is arranged on the filter plate 13 between two adjacent rows of filter cap assemblies 60. The air distribution pipe assembly also includes several horizontal pipes 61 arranged radially along the housing 10. The several horizontal pipes 61 are arranged sequentially along the axial direction of the housing 10. The horizontal pipes 61 are connected to the air distribution pipe assembly through flexible hoses 62. A row of air inlet holes is connected to the horizontal pipes 61 through small pipes 63. During the backwashing process, the backwash water enters the filter media 12 through the filter cap assemblies 60, and the backwash gas enters the filter media 12 through the air inlet holes. This can avoid problems such as insufficient cleaning caused by air and water mixing during simultaneous air and water washing.

[0037] Furthermore, such as Figure 5As shown, in another embodiment of this utility model, the filter plate 13 has a folded plate structure. The filter plate 13 includes several sub-plates, which are arranged radially along the shell. The several sub-plates are connected in sequence. The filter plate after splicing the several sub-plates has a sawtooth structure in the cross section along the axial direction of the shell. The included angle between two adjacent sub-plates is 45°. Several air inlets are evenly distributed along the length of each sub-plate. The air distribution pipe group also includes several horizontal pipes 61 arranged radially along the shell. The several horizontal pipes 61 are arranged in sequence along the axial direction of the shell. The horizontal pipes 61 are connected to the air distribution pipe 42 through the flexible hose 62. The air inlets on two adjacent sub-plates are all connected to the horizontal pipes 61 through the small pipes 63. Several through holes 64 are evenly opened along the length of the sub-plate. The height of the through holes 64 is lower than the height of the air inlets. The through holes 64 are used as water inlet and outlet holes on the filter plate 13. A pad stone layer 66 is provided between the filter plate 13 and the filter material 12. The pad stone layer 66 is made of pebbles or garnets. Backwash water enters the filter media 12 through the inlet and outlet holes on the filter plate 13, and backwash gas enters the filter media 12 through the air inlet hole. In this example, no filter cap assembly is installed on the filter plate 13. Instead, an inlet hole (through hole 64) is opened on the filter plate 13 to replace the filter cap assembly, which reduces the problem of frequent filter cap damage and replacement during use and improves the continuous operation time of the filter.

[0038] Furthermore, such as Figure 6 As shown, in another embodiment of this utility model, the inlet and outlet holes are elongated holes 65, with the center line of the inlet and outlet holes perpendicular to the axis of the housing 10 along their length. Several inlet and outlet holes are arranged sequentially along the axial direction of the housing 10. A row of air inlets arranged radially along the housing 10 is provided between two adjacent inlet and outlet holes. A stone pad layer 66 is provided between the filter plate 13 and the filter media 12, and the stone pad layer 66 is made of pebbles or garnets. The air distribution pipe assembly also includes several horizontal pipes 61 arranged radially along the housing. The horizontal pipes 61 are horizontally arranged, and the several horizontal pipes 61 are arranged sequentially along the axial direction of the housing 10. The horizontal pipes 61 are connected to the air distribution pipe 42 via flexible hoses 62. The air inlets between two adjacent inlet and outlet holes are all connected to a horizontal pipe 61 via small pipes 63. The stone pad layer 66 prevents the filter media from entering the filtered water below the filter plate 13 through the elongated holes 65 (inlet and outlet holes). After filtration, the raw water flows out through the narrow hole 65 and enters the product water pipeline 30. During backwashing, the flushing water enters the pad stone layer through the narrow hole 65 and then enters the filter media 12 to achieve backwashing of the filter media 12.

[0039] The working principle of this multi-media low-resistance horizontal filter is as follows:

[0040] 1. Filtration process: Raw water enters the inlet pipe 20 and the distribution pipe group 23 sequentially through the raw water inlet 21. The raw water is evenly distributed in the filter media 12 inside the filter by the opening on the distribution pipe. Under the filtration of the filter media 12, impurities, colloids, viruses and other substances in the raw water are adsorbed and filtered. The qualified water after filtration enters the pipeline network through the product water outlet 31 of the product water pipe 30, and is further processed by the subsequent reverse osmosis module.

[0041] 2. Backwashing Process: After the filter has been working for 24-36 hours, the turbidity of the produced water increases, requiring backwashing. This filter uses a combined air-water backwashing process. The specific workflow is as follows: Backwashing gas enters the filter media 12 sequentially through the air inlet 41, air washing pipeline 40, air distribution pipe group, and air inlet holes on the filter plate 13, achieving air washing of the filter media 12. Finally, the backwashing gas is discharged from the filter through the exhaust port 11. After air washing for 4-5 minutes, the filter is backwashed with water. The backwashing water enters the filter through the flushing water inlet 32. At this time, the backwashing water and backwashing gas enter the filter media 12 simultaneously to wash the filter media 12. The backwashing water after backwashing the filter media 12 is collected by the water distribution pipe group 23 and discharged into the wastewater network through the flushing water outlet 22. After the backwashing gas and backwashing water wash the filter media 12 for 7-8 minutes, the gas washing is stopped, and water washing continues for 5-6 minutes. At this point, the backwashing process is complete.

[0042] 3. Primary filtrate treatment: After backwashing, the primary filtered water is discharged through the primary filtrate discharge pipeline 50 and from the primary filtrate outlet 51 into the wastewater network.

[0043] Compared to typical vertical filters for seawater desalination, this horizontal filter has a more stable internal flow field distribution, which can improve the filtration speed and reduce the pressure drop, directly reducing pump energy consumption and improving filtration performance.

[0044] This horizontal filter has a large processing capacity, which can reduce the number of filtration devices required; a single unit can process up to 500m³ of material. 3 With a processing capacity of / h and above, it effectively meets the pretreatment needs of large-scale seawater desalination plants, and the modular combination (multiple filters in parallel) allows for flexible expansion of the processing capacity.

[0045] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0046] A multi-media, low-resistance horizontal filter is available for use in water treatment, particularly in large-scale seawater desalination. The filter's components are manufactured and assembled in a factory, enabling modular assembly on-site. This significantly improves construction and installation efficiency, allowing for large-scale deployment and cost reduction. It also solves the problems of traditional concrete filter tanks, which require extensive civil engineering work, have long construction cycles, and offer substantial social and economic benefits.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-media low-resistance horizontal filter, characterized in that, Including the housing, wherein, The housing is provided with filter media and water distribution pipe assembly. The filter media is located in the middle of the housing in the height direction, and the water distribution pipe assembly is located above the filter media. A water inlet pipe is connected to the upper part of the shell in the height direction, and the water distribution pipe group is connected to the water inlet pipe; A water production pipeline is connected to the lower part of the shell in the height direction; Raw water enters the filter media through the inlet pipe and the distribution pipe group in sequence. The filtered qualified water enters the pipeline network through the product water pipe and is further processed by the subsequent reverse osmosis module.

2. The multi-media low-resistance horizontal filter according to claim 1, characterized in that, The shell is a hollow cylindrical body, the shell is installed horizontally, the axis of the shell is parallel to the ground, and the shell is made of fiberglass or carbon steel lined with rubber. The lower end of the housing is provided with a support, and there are two supports, which are symmetrically arranged below the housing. The filter media includes two filter layers, an upper and an lower layer. The filter media in the lower filter layer is quartz sand, and the filter media in the upper filter layer is anthracite or activated carbon. A filter plate is provided below the filter media; The filter plate is provided with air inlet holes and water inlet / outlet holes.

3. The multi-media low-resistance horizontal filter according to claim 2, characterized in that, The water distribution pipe assembly includes one or two water distribution pipes, the axis of which is parallel to the axis along the length of the housing. Each water distribution pipe has several evenly spaced openings. After raw water enters the water distribution pipe through the inlet pipe, the water distribution pipe distributes the raw water into the filter media through the openings. The water inlet pipe includes a vertical section and a horizontal section. The lower end of the vertical section is located in the middle of the height direction of the shell. The horizontal section is arranged laterally in the upper middle part of the shell. The upper end of the vertical section is connected to the middle of the horizontal section. The two ends of the horizontal section pass through the shell and are connected to the water distribution pipe group. The lower end of the vertical section is connected to a raw water inlet and a flushing water outlet; The water production pipeline is connected to a water production outlet and a flushing water inlet; The water distribution pipe assembly is made of fiberglass.

4. The multi-media low-resistance horizontal filter according to claim 2, characterized in that, It also includes an air washing pipeline and an air distribution pipeline assembly. The upper end of the air washing pipeline is located above the housing, and an air inlet is provided at the upper end of the air washing pipeline. The air distribution pipe assembly is disposed inside the housing and is located below the filter plate. The lower end of the air washing pipeline passes through the housing and is connected to the air distribution pipe assembly. The air distribution pipe assembly includes one or two air distribution pipes, the axis of which is parallel to the axis along the length of the housing. The top of the housing is provided with an exhaust port; The gas distribution pipe assembly is made of fiberglass.

5. The multi-media low-resistance horizontal filter according to claim 1, characterized in that, It also includes a primary filtrate discharge pipe, which is connected to the lower end of the housing and is located in the middle of the length direction of the housing. The primary filtrate discharge pipe has a primary filtrate outlet. After backwashing, the substandard effluent from the initial filtration passes through the primary filtrate discharge pipeline and is discharged into the wastewater network from the primary filtrate outlet.

6. The multi-media low-resistance horizontal filter according to claim 4, characterized in that, The filter plate is provided with a plurality of filter cap assemblies, wherein the filter cap assemblies are arranged at a ratio of 40-50 per m. 2 set up, The air distribution pipe is evenly provided with several openings; The distance between the lower end of the filter plate and the lower end of the filter cap assembly is 300mm-400mm; The filter cap assembly serves as both the air inlet and the water inlet / outlet on the filter plate.

7. The multi-media low-resistance horizontal filter according to claim 4, characterized in that, A plurality of rows of filter cap assemblies are arranged on the filter plate along the axial direction of the housing. Each row of filter cap assemblies is arranged radially along the housing, and each row contains a plurality of filter cap assemblies. The filter cap assemblies serve as the inlet and outlet holes on the filter plate. A row of air inlets is provided on the filter plate between two adjacent rows of filter cap assemblies. The air distribution pipe assembly also includes several horizontal pipes arranged radially along the housing. The horizontal pipes are arranged horizontally and are arranged sequentially along the axial direction of the housing. The horizontal pipes are connected to the air distribution pipes through flexible hoses. A row of air inlets is connected to the horizontal pipes through small tubes.

8. The multi-media low-resistance horizontal filter according to claim 4, characterized in that, The filter plate comprises several sub-plates arranged radially along the housing. These sub-plates are connected sequentially, and the resulting filter plate has a serrated cross-section along the axial direction of the housing. The included angle between adjacent sub-plates is 45°. Several air inlet holes are evenly distributed along the length of each sub-plate. The air distribution pipe assembly also includes several horizontal pipes arranged radially along the housing. These horizontal pipes are horizontally positioned and arranged sequentially along the axial direction of the housing. Each horizontal pipe is connected to the air distribution pipe via a flexible hose. The air inlets on adjacent sub-plates are connected to the horizontal pipes via small tubes. A plurality of through holes are evenly provided along the length of the sub-plate. The height of the through holes is lower than the height of the air inlet hole. The through holes are used as the water inlet and outlet holes on the filter plate. A stone pad layer is provided between the filter plate and the filter media, and the stone pad layer is made of pebbles or garnets.

9. The multi-media low-resistance horizontal filter according to claim 4, characterized in that, The water inlet and outlet holes are elongated holes, and the center line of the water inlet and outlet holes along the length direction is perpendicular to the axis of the housing. Several water inlet and outlet holes are arranged sequentially along the axial direction of the housing, and a row of air inlets arranged radially along the housing is provided between two adjacent water inlet and outlet holes. A stone pad layer is provided between the filter plate and the filter media, and the stone pad layer is made of pebbles or garnets; The air distribution pipe assembly also includes several horizontal pipes arranged radially along the shell. The horizontal pipes are arranged horizontally and are arranged sequentially along the axial direction of the shell. The horizontal pipes are connected to the air distribution pipes through flexible hoses. The air inlets between two adjacent water inlets and outlets are all connected to the horizontal pipes through small pipes.

10. The multi-media low-resistance horizontal filter according to claim 1, characterized in that, Differential pressure measuring instruments are installed on both the inlet water pipeline and the product water pipeline. A valve is installed on the product water pipeline. The differential pressure measuring instrument is interlocked with the valve to achieve stable production of product water.

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