Composite automatic backwash filter

Abstract

The application relates to the sewage purification technical field, in particular to a composite material automatic backwashing filter, which comprises a filter body and a reverse flushing system; the reverse flushing system and the filter body are connected through a control valve assembly and are used for periodically backwashing a filter layer in the filter body; the filter body comprises a water inlet, a descending pipe, a filter chamber, a filtered water communication chamber, a clean water ascending pipe, a clean water chamber, a clean water outlet, a water inlet air pipe and a clean water chamber air pipe; the reverse flushing system comprises a backwashing water tank and a backwashing water outlet pipe. The composite material automatic backwashing filter disclosed by the application realizes self-flow type filtration of water flow under the action of gravity by using the height difference between the water inlet and the clean water outlet, does not need additional power equipment, opens the backwashing control valve to form negative pressure when backwashing, reversely washes the filter layer by using siphon effect, does not need to stop during the whole process, continuously feeds water, and guarantees the continuity of water supply.

Description

Technical Field

[0001] This application relates to the field of wastewater purification technology, and in particular to an automatic backwashing filter made of composite materials. Background Technology

[0002] Currently, the metal filters widely used in existing technologies are highly susceptible to corrosion from various complex wastewaters during long-term operation. This leads to wear and performance degradation of key components, significantly shortening their overall lifespan. Furthermore, these filters are generally bulky and require a large footprint, increasing initial construction and space costs, and resulting in high energy consumption during operation, with significant daily electricity and water consumption, further driving up operating expenses. In addition, their maintenance is complex and frequent, requiring substantial manpower and spare parts resources, resulting in high overall maintenance costs. Especially when treating industrial wastewater with complex composition and fluctuating pollutant concentrations, the filtration accuracy and stability of traditional metal filters decrease significantly, filter media clogging rapidly, backwashing mechanisms are ineffective, and backwashing is incomplete and frequent, severely impacting treatment efficiency and effluent quality in continuous production. Therefore, current traditional filters are ill-suited to the stringent requirements of modern industry for high treatment efficiency, low energy consumption, intelligent control, and optimized life-cycle costs, as well as increasingly stringent environmental standards. Utility Model Content

[0003] The purpose of this application is to provide an automatic backwash filter made of composite materials to solve at least one of the technical problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, this application provides an automatic backwashing filter made of composite materials, including a filter body and a backwashing system; The backwashing system and the filter body are connected by a control valve assembly for periodically backwashing the filter layer inside the filter body. The filter body includes an inlet, a downcomer, a filter chamber, a filtered water connecting chamber, a purified water riser, a purified water chamber, a purified water outlet, an inlet vent pipe, and a purified water chamber vent pipe. The inlet is connected to the downcomer and is used to introduce the water to be filtered into the filter chamber; The downcomer is connected to the top of the filter chamber. After the filtered water enters the filter chamber through the downcomer, it is filtered from top to bottom. The filtered water then enters the filtered water connecting chamber. The lower end of the purified water riser pipe is connected to the purified water connecting chamber, and the upper end extends into the purified water chamber to introduce the filtered water into the purified water chamber. The water purification chamber is equipped with a water purification outlet at the top for the purified water to be discharged. The air vent pipe of the water purification chamber is located at the top of the water purification chamber, and the water inlet air vent pipe is located above the water inlet to balance the air pressure during equipment operation. The height of the water inlet is not lower than the height of the purified water outlet to ensure that the water flows smoothly into the filter chamber under the action of gravity; The backwashing system includes a backwashing tank and a backwashing outlet pipe; The lower end of the backwash outlet pipe is connected to the backwash water tank, and the upper end extends into the top of the filter chamber. The lower end of the backwash outlet pipe is lower than the bottom of the filtered water connecting chamber, so that the water automatically triggers the backwashing process through the siphon effect. The water in the filtered water connecting chamber backwashes the filter chamber from bottom to top and enters the backwash water tank through the backwash outlet pipe to complete the sewage discharge. The control valve assembly includes a backwash control valve disposed on the backwash outlet pipe, used to open and close the passage of the backwash outlet pipe to control the start and termination of the backwash process.

[0005] Furthermore, a water distribution baffle is provided between the downcomer and the filter chamber; The water distribution baffle is used to evenly distribute the water flow entering the filter chamber, so that the water flow falls evenly into the filter chamber.

[0006] Furthermore, the water filtration chamber is provided with a filter layer and a filter plate; The filter layer is disposed on the filter plate; The filter plate is located at the bottom of the water filtration chamber to support the filter layer and allow filtered water to pass through.

[0007] Furthermore, a filter plate support structure is provided below the filter plate to enhance the load-bearing strength of the filter plate; The lower end of the filter plate support structure is fixedly connected to the bottom wall of the filtered water communication chamber, and the upper end is fixedly connected to the bottom of the filter plate, ensuring that the filter plate remains stable and does not deform under high pressure differential.

[0008] Furthermore, the backwash control valve includes a regulating valve and an on / off valve connected in series on the backwash outlet pipe; The valve is normally closed in its initial state and is only opened when backwashing is required to trigger the siphon effect. The regulating valve is used to control the backwash water flow rate to ensure that the backwash intensity is moderate and to avoid filter bed loss.

[0009] Furthermore, the filter body also includes a vent pipe; The control valve assembly also includes a vent control valve; The vent pipe is located at the bottom of the filtered water connecting chamber, and the vent control valve is located on the vent pipe. It is used to drain the water stored in the filtered water connecting chamber and the filter chamber, which facilitates equipment inspection and maintenance.

[0010] Furthermore, the control valve assembly is either electrically or manually operated.

[0011] Furthermore, the backwashing system also includes a backwash pipe support; One end of the backwash pipe bracket is fixedly mounted on the filter body, and the other end supports and fixes the backwash outlet pipe to ensure that it maintains a stable posture during operation and avoids displacement or vibration caused by water flow impact.

[0012] Furthermore, the filter body also includes a manhole for the clean water chamber and a manhole for the filter water chamber; The manhole for the water purification chamber is located above or on the side wall of the water purification chamber, allowing operators to enter the water purification chamber for maintenance. The manhole of the water filter chamber is located above the water filter chamber, allowing operators to enter the water filter chamber to replace or maintain the filter layer.

[0013] Furthermore, the filter body also includes upper and lower ladders; The ladders are fixedly installed on the inner walls of the water purification chamber and the water filtration chamber, allowing operators to safely enter and exit the water purification chamber and the water filtration chamber for inspection or maintenance. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the planar structure of an automatic backwashing filter made of composite materials disclosed in this application; Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0016] Figure label: 1-Filter body; 11-Inlet; 12-Downcomer; 13-Filter chamber; 131-Water distribution baffle; 132-Filter layer; 133-Filter plate; 134-Filter plate support structure; 135-Manhole for filter chamber; 14-Filtered water connection chamber; 15-Clean water riser; 16-Clean water chamber; 161-Manhole for clean water chamber; 162-Up and down ladder; 17-Clean water outlet; 181-Inlet vent pipe; 182-Clean water chamber vent pipe; 19-Vent pipe; 2-Backwash system; 21-Backwash water tank; 22-Backwash outlet pipe; 23-Backwash pipe support; 3-Control valve assembly; 31-Regulating valve; 32-On / off valve; 33-Vent control valve. Detailed Implementation

[0017] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 application 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 application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0020] It should also be noted that the specific embodiments or implementation methods described below are a series of optimized settings listed in this application to further explain the specific application content, and these settings can be combined or used in conjunction with each other.

[0021] The present application will be further explained below with reference to specific implementation methods.

[0022] like Figure 1-2As shown, this embodiment provides an automatic backwashing filter for composite materials, including a filter body 1 and a backwashing system 2; The backwashing system 2 and the filter body 1 are connected by a control valve assembly 3, and are used to periodically backwash the filter layer 132 inside the filter body 1. The filter body 1 includes an inlet 11, a downcomer 12, a filter chamber 13, a filtered water connecting chamber 14, a purified water riser 15, a purified water chamber 16, a purified water outlet 17, an inlet vent pipe 181, and a purified water chamber vent pipe 182. The inlet 11 is connected to the downcomer 12 and is used to introduce the water to be filtered into the filter chamber 13. The downcomer 12 is connected to the top of the filter chamber 13. After the filtered water enters the filter chamber 13 through the downcomer 12, it is filtered from top to bottom. The filtered water then enters the filtered water connecting chamber 14. The lower end of the purified water riser pipe 15 is connected to the purified water connecting chamber, and the upper end extends into the purified water chamber 16 to introduce the filtered water into the purified water chamber 16. The water purification chamber 16 is provided with a water purification outlet 17 at the top for the purified water to be discharged. The air vent pipe 182 of the water purification chamber is located at the top of the water purification chamber 16, and the water inlet air vent pipe 181 is located above the water inlet 11 to balance the air pressure during the operation of the equipment. The height of the water inlet 11 is not lower than the height of the purified water outlet 17, so as to ensure that the water flows smoothly into the water filter chamber 13 under the action of gravity; The backwashing system 2 includes a backwashing water tank 21 and a backwashing water outlet pipe 22; The lower end of the backwash outlet pipe 22 is connected to the backwash water tank 21, and the upper end extends into the top of the filter chamber 13. The lower end of the backwash outlet pipe 22 is lower than the bottom of the filtered water connecting chamber 14, so that the water automatically triggers the backwashing process through the siphon effect. The water in the filtered water connecting chamber 14 backwashes the filter chamber 13 from bottom to top and enters the backwash water tank 21 through the backwash outlet pipe 22 to complete the sewage discharge. The control valve assembly 3 includes a backwash control valve disposed on the backwash outlet pipe 22, which is used to open and close the passage of the backwash outlet pipe 22 to control the start and termination of the backwash process.

[0023] The automatic backwash filter of composite materials disclosed in this application operates as follows: During normal filtration, wastewater enters the downcomer 12 from the inlet 11, passes through the filter chamber 13 from top to bottom for filtration, and the purified water flows into the post-filter water connecting chamber 14 before being introduced into the purified water chamber 16 via the purified water riser 15, and finally exits from the purified water outlet 17. During this process, because the height of the inlet 11 is not lower than the height of the purified water outlet 17, the water flow continuously and stably enters the filter chamber 13 under gravity, achieving gravity-flow filtration without the need for additional power equipment, thus saving electrical costs, floor space, and operating costs. During backwashing, when the backwash control valve is opened, a negative pressure is formed in the backwash outlet pipe 22. The purified water in the post-filter water connecting chamber 14 rapidly flows into the backwash outlet pipe 22 under siphon action, flushing back the impurities trapped on the surface of the filter layer 132 in the filter chamber 13, achieving efficient cleaning. After cleaning, the backwash control valve is closed, the siphon is interrupted, and the system returns to normal filtration. The entire process requires no shutdown and continuous water intake, ensuring a continuous water supply. During backwashing, the water flow direction in filter chamber 13 changes from top to bottom as in conventional filtration to bottom to top, effectively loosening and removing suspended solids and particulate impurities trapped in the filter layer, thus preventing pressure drop caused by clogging of filter layer 132. By setting the opening frequency and duration of the backwash control valve, the cleaning cycle can be dynamically adjusted according to the influent water quality, achieving an optimal balance between energy consumption and cleaning effect.

[0024] As a further embodiment of this embodiment, a water distribution baffle 131 is provided between the downcomer 12 and the water filter chamber 13; The water distribution baffle 131 is used to evenly distribute the water flow entering the water filter chamber 13, so that the water flow falls evenly into the water filter chamber 13.

[0025] The water distribution baffle 131 in this embodiment effectively prevents water flow from directly impacting the filter media layer, thus preventing short-circuiting or turbulence, and ensuring that the incoming water forms a stable and uniform downward flow within the filter chamber 13. This design not only improves filtration efficiency but also extends the service life of the filter media, reduces the frequency of backwashing, and further reduces operating and maintenance costs. Simultaneously, the conical structure facilitates the concentrated settling of suspended solids, and combined with regular backwashing, it maintains the system's long-term efficient operation. The entire device is compact, easy to operate, and suitable for continuous water supply scenarios under various water quality conditions.

[0026] As a further embodiment of this embodiment, the water filtration chamber 13 is provided with a filter layer 132 and a filter plate 133; The filter layer 132 is disposed on the filter plate 133; The filter plate 133 is disposed at the bottom of the water filtration chamber 13 to support the filter layer 132 and allow filtered water to pass through.

[0027] In a preferred embodiment of this invention, the filter plate 133 is made of high-strength stainless steel, with uniformly distributed filter holes on its surface. The pore size is controlled within 0.1 mm, effectively trapping filter media particles and ensuring sufficient water flow area. The filter plate 133 and the bottom of the filter chamber 13 are sealed by welding to prevent short-circuiting of unfiltered water. The filter layer 132 is composed of multi-sized quartz sand and anthracite, with the particle size gradually decreasing from top to bottom, forming a gradient filtration structure that significantly improves the ability to trap suspended solids. Under gravity, the raw water passes through filter media layers of different particle sizes in sequence, achieving step-by-step purification, with the effluent turbidity consistently below 1 NTU. The high-strength stainless steel filter plate 133 has excellent compressive strength and can withstand the impact of high-speed water flow from bottom to top during backwashing, ensuring long-term stable operation of the structure. The filter layer 132 maintains a good pore structure during long-term operation, effectively preventing caking and channeling. During backwashing, water enters from below filter plate 133, is evenly distributed, and then penetrates upwards through filter layer 132, fully loosening and carrying away trapped impurities. The system automatically adjusts the backwashing cycle and duration according to the influent water quality to avoid over-cleaning and water waste. The entire device adopts a modular design, which is convenient for installation and maintenance and can adapt to different scales of water supply needs.

[0028] As a further embodiment of this embodiment, a filter plate support structure 134 is provided below the filter plate 133 to enhance the load-bearing strength of the filter plate 133. The lower end of the filter plate support structure 134 is fixedly connected to the bottom wall of the filtered water communication chamber 14, and the upper end is fixedly connected to the bottom of the filter plate 133, ensuring that the filter plate 133 remains stable and does not deform under high pressure differential.

[0029] In a preferred embodiment of this invention, the filter plate support structure 134 adopts a mesh-like reinforcing rib design, evenly distributed below the filter plate 133, effectively dispersing the impact force of water flow and the load on the filter media, preventing deformation or breakage caused by local stress concentration. The support structure and the filter plate 133 are firmly connected by corrosion-resistant bolts and sealing gaskets, ensuring the stability and sealing of the overall structure. Under long-term operating conditions, this design can significantly improve the fatigue resistance of the filter plate 133 and adapt to the dynamic load changes caused by frequent backwashing. Combined with the water collection function of the filtered water connecting chamber 14, the filtered clean water is evenly collected by the filter plate 133 and flows into the connecting chamber, and then stably discharged through the outlet pipe, ensuring constant effluent quality and flow rate.

[0030] As a further embodiment of this embodiment, the backwash control valve includes a regulating valve 31 and an on / off valve 32 connected in series on the backwash outlet pipe 22. The opening and closing valve 32 is normally closed in the initial state and is only opened when backwashing is required to trigger the siphon effect; The regulating valve 31 is used to control the backwash water flow rate to ensure that the backwash intensity is moderate and to avoid filter bed loss.

[0031] In this preferred embodiment, the opening degree of the regulating valve 31 can be preset according to the filter layer thickness and particle size distribution, and dynamically fine-tuned based on operating data to ensure that the filter media expands appropriately and impurities are effectively removed during backwashing. After the on / off valve 32 is opened, a negative pressure is formed in the siphon pipe, causing the clean water in the filtered water connecting chamber 14 to flow backward through the filter plate 133, rinsing the filter layer 132 from bottom to top. The water flow penetrates the filter media evenly, allowing the quartz sand and anthracite to fully expand and suspend, releasing the trapped dirt. The backwash wastewater is discharged into the overflow tank through the siphon riser pipe and finally flows into the sewage pipe. The entire process does not require an external backwash water pump and is completed automatically by relying on the internal water level difference and siphon principle. After backwashing is completed, the on / off valve 32 automatically closes, and the system returns to gravity filtration mode. This design simplifies the equipment structure, reduces operating energy consumption and maintenance costs, and improves backwashing response efficiency, ensuring that the water quality continuously and stably meets the standards.

[0032] As a further embodiment of this invention, the filter body 1 also includes a vent pipe 19; The control valve assembly 3 also includes a vent control valve 33; The vent pipe 19 is located at the bottom of the filtered water connecting chamber 14, and the vent control valve 33 is located on the vent pipe 19. It is used to drain the water stored in the filtered water connecting chamber 14 and the filter chamber 13, so as to facilitate equipment inspection and maintenance.

[0033] As a further embodiment of this example, the control valve assembly 3 is electrically or manually operated.

[0034] As a further embodiment of this example, the backwashing system 2 also includes a backwashing pipe support 23; One end of the backwash pipe bracket 23 is fixedly mounted on the filter body 1, and the other end supports and fixes the backwash outlet pipe 22 to ensure that it maintains a stable posture during operation and avoids displacement or vibration caused by water flow impact.

[0035] As a further embodiment of this embodiment, the filter body 1 also includes a water purification chamber manhole 161 and a water filtration chamber manhole 135; The manhole 161 of the water purification chamber is located above or on the side wall of the water purification chamber 16, and is used to allow operators to enter the water purification chamber 16 for maintenance. The manhole 135 of the water filter chamber is located above the water filter chamber 13 and is used to allow operators to enter the water filter chamber 13 to replace or maintain the filter layer 132.

[0036] As a further embodiment of this invention, the filter body 1 also includes an upper and lower ladder 162; The ladder 162 is fixedly installed on the inner wall of the water purification chamber 16 and the water filtration chamber 13, so that operators can climb up and down the ladder to safely enter and exit the water purification chamber 16 and the water filtration chamber 13 for inspection or maintenance.

[0037] The automatic backwashing filter for composite materials disclosed in this application consists of a filter body 1 and a backwashing system 2, which are connected by a control valve assembly 3 to achieve periodic backwashing of the filter layer 132. The filter body 1 includes an inlet 11, a downcomer 12, a filter chamber 13, a filtered water connecting chamber 14, a purified water riser 15, a purified water chamber 16, a purified water outlet 17, an inlet vent pipe 181, and a purified water chamber vent pipe 182. The inlet 11 is connected to the downcomer 12 and introduces the water to be filtered to the top of the filter chamber 13. After filtration from top to bottom, the water enters the filtered water connecting chamber 14, then flows through the purified water riser 15 into the purified water chamber 16, and finally exits from the top purified water outlet 17. The inlet vent pipe 181 and the purified water chamber vent pipe 182 are respectively located above the inlet 11 and the top of the purified water chamber 16 to balance the air pressure. The height of the inlet 11 is not lower than the height of the purified water outlet 17, ensuring that the water flow achieves gravity-driven filtration without the need for additional power equipment, saving electrical costs, floor space, and operating costs. The filtration chamber 13 is equipped with a water distribution baffle 131, a filter layer 132, and a filter plate 133. The water distribution baffle 131 has a conical structure with guide holes, which can evenly distribute the water flow and prevent direct impact on the filter media layer. The filter layer 132 is composed of multi-grade quartz sand and anthracite in a gradient structure, with the particle size gradually decreasing from top to bottom to improve the ability to intercept suspended solids. The filter plate 133 is made of high-strength stainless steel with high-precision filter holes on the surface and a mesh-type reinforcing rib filter plate support structure 134 at the bottom to enhance the load-bearing strength and ensure stability. The filter body 1 is also equipped with a vent pipe 19 (with a vent control valve 33) for maintenance and draining of stored water, as well as a manhole 161 for the clean water chamber, a manhole 135 for the filter chamber, and an upper and lower ladder 162 for easy maintenance.

[0038] The backwashing system 2 includes a backwash water tank 21, a backwash outlet pipe 22, and a backwash pipe support 23. The lower end of the backwash outlet pipe 22 is connected to the water tank, and the upper end extends into the top of the filter chamber 13, with its lower end lower than the bottom of the filtered water connecting chamber 14. The control valve assembly 3 includes a backwashing control valve located on the backwash outlet pipe 22. This valve consists of a regulating valve 31 and an on / off valve 32 connected in series. The on / off valve 32 is normally closed to control the start and stop of backwashing, while the regulating valve 31 controls the backwash water flow rate. During backwashing, the backwashing control valve is opened, creating a negative pressure in the backwash outlet pipe 22. Under siphon action, the purified water in the filtered water connecting chamber 14 flows backward through the backwash outlet pipe 22, flushing impurities from the filter layer 132. At this time, the water flow direction in the filter chamber 13 changes to upward, effectively cleaning the filter layer. After completion, the control valve is closed, the siphon is interrupted, and filtration resumes. The entire backwashing process does not require shutdown, ensuring continuous water supply, and requires no additional power, saving costs.

[0039] By adopting the above technical solution, this application has the following beneficial effects: (1) The composite material automatic backwash filter disclosed in this application utilizes the height difference between the water inlet 11 and the clean water outlet 17 to achieve gravity-driven filtration of water flow, without the need for additional power equipment, effectively saving electrical costs, reducing the floor space, and lowering operating costs.

[0040] (2) The composite material automatic backwash filter disclosed in this application forms a negative pressure by opening the backwash control valve during backwashing, and uses the siphon effect to make the clean water in the filter water connecting chamber 14 backwash the filter layer 132, effectively removing impurities; and the whole process does not require stopping the machine, and water continues to enter, ensuring the continuity of water supply.

[0041] (3) The water distribution baffle 131 of the composite material automatic backwash filter disclosed in this application evenly distributes the water flow, preventing the water flow from directly impacting the filter media layer and causing short flow or turbulence, thereby improving the filtration efficiency, extending the service life of the filter media, and reducing the frequency of backwashing; the filter layer 132 adopts a gradient structure composed of multi-grade quartz sand and anthracite, which significantly improves the interception capacity of suspended solids and keeps the turbidity of the effluent low.

[0042] (4) The filter plate 133 of the composite material automatic backwash filter disclosed in this application is made of high-strength stainless steel, which has excellent compressive strength and can withstand the impact of high-speed water flow during backwashing; the filter plate support structure 134 adopts a mesh-type reinforcing rib design, which effectively disperses the impact force of water flow and the load of filter media, prevents the filter plate 133 from deforming or breaking, adapts to the dynamic load changes brought about by frequent backwashing, and ensures the long-term stable operation of the structure.

[0043] (5) The backwash control valve of the composite material automatic backwash filter disclosed in this application consists of a regulating valve 31 and an on / off valve 32 connected in series. The on / off valve 32 controls the start and stop of backwashing, and the regulating valve 31 controls the backwash water flow rate. The opening degree can be preset according to the filter layer thickness and particle size distribution and dynamically fine-tuned in combination with the operating data to ensure that the backwash intensity is moderate, avoid filter layer loss, and achieve the optimal balance between energy consumption and cleaning effect.

[0044] (6) The composite material automatic backwash filter disclosed in this application is equipped with a vent pipe 19 and a vent control valve 33 to facilitate the drainage of water in the equipment for maintenance; it is equipped with a manhole 161 for the clean water chamber, a manhole 135 for the filter water chamber and an upper and lower ladder 162 to facilitate the operation of operators to enter and exit for inspection, replacement or maintenance of the filter layer 132 and other operations.

[0045] (7) The composite material automatic backwash filter disclosed in this application adopts a modular design, which is convenient for installation and maintenance, can adapt to different scale water supply needs, and is suitable for continuous water supply scenarios under various water quality conditions.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A composite material automatic backwashing filter, characterized in that, Includes the filter body and the backwashing system; The backwashing system and the filter body are connected by a control valve assembly for periodically backwashing the filter layer inside the filter body. The filter body includes an inlet, a downcomer, a filter chamber, a filtered water connecting chamber, a purified water riser, a purified water chamber, a purified water outlet, an inlet vent pipe, and a purified water chamber vent pipe. The inlet is connected to the downcomer and is used to introduce the water to be filtered into the filter chamber; The downcomer is connected to the top of the filter chamber. After the filtered water enters the filter chamber through the downcomer, it is filtered from top to bottom. The filtered water then enters the filtered water connecting chamber. The lower end of the purified water riser pipe is connected to the purified water connecting chamber, and the upper end extends into the purified water chamber to introduce the filtered water into the purified water chamber. The water purification chamber is equipped with a water purification outlet at the top for the purified water to be discharged. The air vent pipe of the water purification chamber is located at the top of the water purification chamber, and the water inlet air vent pipe is located above the water inlet to balance the air pressure during equipment operation. The height of the water inlet is not lower than the height of the purified water outlet to ensure that the water flows smoothly into the filter chamber under the action of gravity; The backwashing system includes a backwashing tank and a backwashing outlet pipe; The lower end of the backwash outlet pipe is connected to the backwash water tank, and the upper end extends into the top of the filter chamber. The lower end of the backwash outlet pipe is lower than the bottom of the filtered water connecting chamber, so that the water automatically triggers the backwashing process through the siphon effect. The water in the filtered water connecting chamber backwashes the filter chamber from bottom to top and enters the backwash water tank through the backwash outlet pipe to complete the sewage discharge. The control valve assembly includes a backwash control valve disposed on the backwash outlet pipe, used to open and close the passage of the backwash outlet pipe to control the start and termination of the backwash process.

2. The composite material automatic backwashing filter according to claim 1, characterized in that, A water distribution baffle is provided between the downcomer and the filter chamber; The water distribution baffle is used to evenly distribute the water flow entering the filter chamber, so that the water flow falls evenly into the filter chamber.

3. The composite material automatic backwashing filter according to claim 1, characterized in that, The filtration chamber is equipped with a filter layer and a filter plate; The filter layer is disposed on the filter plate; The filter plate is located at the bottom of the water filtration chamber to support the filter layer and allow filtered water to pass through.

4. The composite material automatic backwashing filter according to claim 3, characterized in that, A filter plate support structure is provided below the filter plate to enhance the load-bearing strength of the filter plate; The lower end of the filter plate support structure is fixedly connected to the bottom wall of the filtered water communication chamber, and the upper end is fixedly connected to the bottom of the filter plate, ensuring that the filter plate remains stable and does not deform under high pressure differential.

5. The composite material automatic backwashing filter according to claim 1, characterized in that, The backwash control valve includes a regulating valve and an on / off valve connected in series on the backwash outlet pipe. The valve is normally closed in its initial state and is only opened when backwashing is required to trigger the siphon effect. The regulating valve is used to control the backwash water flow rate to ensure that the backwash intensity is moderate and to avoid filter bed loss.

6. The composite material automatic backwashing filter according to claim 1, characterized in that, The filter body also includes a vent pipe; The control valve assembly also includes a vent control valve; The vent pipe is located at the bottom of the filtered water connecting chamber, and the vent control valve is located on the vent pipe. It is used to drain the water stored in the filtered water connecting chamber and the filter chamber, which facilitates equipment inspection and maintenance.

7. The composite material automatic backwashing filter according to claim 1, characterized in that, The control valve assembly can be operated electrically or manually.

8. The composite material automatic backwashing filter according to claim 1, characterized in that, The backwashing system also includes a backwash pipe support; One end of the backwash pipe bracket is fixedly mounted on the filter body, and the other end supports and fixes the backwash outlet pipe to ensure that it maintains a stable posture during operation and avoids displacement or vibration caused by water flow impact.

9. The composite material automatic backwashing filter according to claim 1, characterized in that, The filter body also includes a manhole for the clean water chamber and a manhole for the filter water chamber; The manhole for the water purification chamber is located above or on the side wall of the water purification chamber, allowing operators to enter the water purification chamber for maintenance. The manhole of the water filter chamber is located above the water filter chamber, allowing operators to enter the water filter chamber to replace or maintain the filter layer.

10. The composite material automatic backwashing filter according to claim 9, characterized in that, The filter body also includes upper and lower ladders; The ladders are fixedly installed on the inner walls of the water purification chamber and the water filtration chamber, allowing operators to safely enter and exit the water purification chamber and the water filtration chamber for inspection or maintenance.

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