System with automatic filter element backwashing function

Abstract

The system comprises a filtering tank and a balance tank, a water inlet pipe is arranged on the side wall of the filtering tank, a cylindrical filter element is installed in the filtering tank, the filtering tank is divided into an outer-layer filtering cavity and an inner-layer filtrate cavity by the filter element, a water outlet pipe is arranged on the filtrate cavity, and a water inlet pipe is arranged on the water outlet pipe. The water outlet pipe is respectively connected with a water conveying pipe and a backflushing pipe through a three-way reversing valve; a suction pump is installed on the back-flushing pipe, the back-flushing pipe is communicated with the interior of the filtrate cavity through a hydrodynamic bin, a center rod is rotationally installed in the hydrodynamic bin, a plurality of wheel blades are evenly distributed on the outer wall of the center rod in the circumferential direction, a bevel gear is fixed to the end, extending out of the hydrodynamic bin, of the center rod, a bevel gear ring is connected to the bevel gear in a meshed mode, and a rotating ring is fixed to the lower portion of the bevel gear ring; and the rotating ring is rotationally connected with the filtering tank and extends into the tank to be coaxially fixed with the filter element. Kinetic energy of backflushing fluid is converted into mechanical energy, the filter element is automatically driven to rotate and flushed, the automation degree is high, and the energy-saving effect is remarkable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of backwashing filter core, in particular to a system with automatic backwashing function of filter core. BACKGROUND

[0002] In the field of industrial production, water treatment and the like, liquid filtration is a crucial link, and cylindrical filter cores are widely used due to their large filtration area and high efficiency. However, during the filtration process, pollutants will continuously accumulate on the outer surface of the filter core, resulting in increased filtration resistance and decreased flux. Therefore, the filter core must be cleaned regularly to restore its filtration performance.

[0003] Traditional filter core cleaning methods mainly include two types: one is shutdown and manual cleaning, i.e., the filtration system needs to be stopped and the filter core needs to be disassembled for cleaning by manual or external equipment. This method is not only cumbersome, labor-intensive, time-consuming and labor-consuming, but also affects the continuity of production. The other is traditional backwashing, which usually requires a complex control system and an additional source of clean water or compressed air to provide a backwashing flow. This not only increases the initial investment cost and energy consumption of the system, but also makes the system structure complex, inconvenient to maintain, and limited in application where the backwashing water source is not readily available.

[0004] Therefore, we propose a system with automatic backwashing function of filter core to solve the above problems. SUMMARY

[0005] The present application relates to the technical field of backwashing filter core, in particular to a system with automatic backwashing function of filter core.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A system with automatic backwashing function of filter core, comprising a filter tank and a balance tank, a water inlet pipe is arranged on the side wall of the filter tank, a cylindrical filter core is installed inside the filter tank, the filter core separates the filter tank into an outer filtration chamber and an inner filtrate chamber, a water outlet pipe is arranged on the filtrate chamber, a sewage valve is arranged below the filtration chamber, the water outlet pipe is connected to a water delivery pipe and a backwashing pipe through a three-way reversing valve, the water delivery pipe is connected to the balance tank, and a liquid discharge pipe is further arranged on the balance tank;

[0008] A suction pump is installed on the backwashing pipe, and the backwashing pipe is connected to the filtrate chamber through a water-driven chamber, a central rod is rotatably installed in the water-driven chamber, and a plurality of blades are evenly distributed on the outer wall of the central rod in the circumferential direction, when liquid flows through the backwashing pipe, the blades are driven to rotate by the impact of the liquid.

[0009] A bevel gear is fixed to one end of the central rod extending out of the water-driven chamber, the bevel gear is externally meshed with a bevel gear ring, a rotating ring is fixed below the bevel gear ring, and the rotating ring is rotatably connected to the filter tank and extends into the tank to be coaxially fixed with the filter core.

[0010] In further embodiments, a pair of scrapers are installed in the filter cavity of the filter tank, and a scraping strip is arranged on one end of the scraper close to the filter element, the length of the scraping strip being greater than the length of the filter element.

[0011] In further embodiments, a hollow water channel is formed in the scraper, and the end of the scraper extending out of the filter tank is connected to the backflush pipe through a connecting pipe, a plurality of water injection holes are equidistantly formed in the side wall of the scraper along the length direction, and the water injection holes are connected to the hollow water channel.

[0012] In further embodiments, the axis of the water injection hole is tangent to the outer surface of the filter element.

[0013] In further embodiments, a sealing needle is slidingly inserted into the water injection hole, and a movable strip is installed in the hollow water channel, the sealing needle and the movable strip being hingedly connected, a telescopic cover is installed between the back plate of the scraper and the periphery of the movable strip, and a disc spring is installed in the telescopic cover.

[0014] In further embodiments, the water injection hole adopts an inverted horn structure with a small outer end and a large inner end, the sealing needle adopts a conical structure with a thin head end and a thick tail end, and the slope of the sealing needle is consistent with the slope of the water injection hole.

[0015] In further embodiments, an anti-backflow structure is installed in the bottom port of the backflush pipe, the anti-backflow structure comprising a blocking ring and a conical block, the blocking ring and the conical block being connected through a spring, and a beveled through hole is formed in the blocking ring to seal the conical block.

[0016] In further embodiments, a sealing element is arranged at the rotating connection between the rotating ring and the filter tank, and at the rotating connection between the central rod and the water-driven bin, the sealing element adopting one or a combination of mechanical sealing, packing sealing and rotary joint.

[0017] In further embodiments, a sealing cover is further arranged on the filter tank, the sealing cover being composed of two half covers, and the water supply pipe passes through the joint seam of the two half covers.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] The present application uses the filtered clean liquid as the backflushing medium, and converts the kinetic energy of the backflushing fluid into mechanical energy through the power provided by the suction pump to drive the water-driven mechanism, thereby automatically driving the filter element to rotate and flush, without the need for an external motor to drive the filter element, and without the need for an additional water source, thereby realizing the recycling of energy, improving the degree of automation and achieving significant energy-saving effect.

[0020] The system of the application combines three cleaning mechanisms of rotary shearing force, scraping action and hydraulic jetting. The rotating filter core and the fixed scraper and scraping strip produce relative movement, and stubborn dirt is scraped off with great force. At the same time, the high-pressure tangential water flow jetted from the water jetting hole of the scraper washes the surface of the filter core, further disintegrating and removing the pollutants, ensuring the thoroughness and high efficiency of backwashing, and effectively restoring the flux of the filter core.

[0021] The application also designs the disc spring and sealing needle in the water jetting hole, so that the opening and closing of the water jetting hole and the water pressure are linked with the water pressure in the backwashing pipe. When the pressure is insufficient, the water jetting hole is automatically closed to prevent dirt from entering the inside of the scraper. When the pressure is sufficient, the water jetting hole is automatically opened and forms a high-speed jet, which not only ensures effective cleaning, but also avoids the problem of blockage in the non-working state, and has high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Fig. 1 is a structural schematic diagram of the application;

[0023] Figure 2 Fig. 2 is a structural schematic diagram of the filter tank of the application;

[0024] Figure 3 Fig. 3 is a structural schematic diagram of the inside of the water-driven bin of the application;

[0025] Figure 4 Fig. 4 is a structural schematic diagram of the installation of the filter core and the scraper of the application;

[0026] Figure 5 Fig. 5 is a structural schematic diagram of the half-section of the filter tank of the application;

[0027] Figure 6 Fig. 6 is a structural schematic diagram of the top view of the filter core and the scraper of the application;

[0028] Figure 7 Fig. 7 is a structural schematic diagram of the top view and partial section of the filter core and the scraper of the application;

[0029] Figure 8 Fig. 8 is a structural schematic diagram of the longitudinal section and partial structure of the scraper of the application;

[0030] Figure 9 Fig. 9 is a structural schematic diagram of the inside of the water-driven bin of the application; Figure 5 Fig. 10 is a structural schematic diagram of the partial enlargement of A of the application.

[0031] In the figure: 1, filter tank; 2, water inlet pipe; 3, water outlet pipe; 4, filter core; 5, three-way reversing valve; 6, water delivery pipe; 7, backflush pipe; 71, blocking ring; 72, conical block; 73, spring; 8, balance tank; 9, liquid discharge pipe; 10, suction pump; 11, water-driven bin; 12, vane; 13, center rod; 14, bevel gear; 15, bevel gear ring; 16, rotating ring; 17, scraper; 171, water injection hole; 172, hollow water channel; 173, movable strip; 174, sealing needle; 175, disc spring; 176, telescopic cover; 18, scraping strip; 19, connecting pipe; 20, blowdown valve; 21, sealing member; 22, sealing cover. DETAILED DESCRIPTION

[0032] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified and limited.

[0033] In the description of the present application, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0035] Please refer to Figures 1-2 and Figures 4-5A system with automatic backwashing function of filter core, comprising a filter tank 1 and a balance tank 8, the filter tank 1 is provided with an inlet pipe 2 on the side wall, and a cylindrical filter core 4 is installed inside, which separates the filter tank 1 into an outer filter cavity and an inner filtrate cavity, the top of the filtrate cavity is connected with an outlet pipe 3, and a blowdown valve 20 is arranged at the bottom of the filter cavity, and the bottom of the filter tank 1 adopts a funnel type structure to facilitate the centralized discharge of backwashing sewage.

[0036] Please refer to Figure 2 and 4 -5, an outlet pipe 3 is installed with a three-way reversing valve 5, one outlet of which is connected to the upper part of the balance tank 8 through a water conveying pipe 6, and the balance tank 8 is additionally provided with a liquid discharge pipe 9 to output the final product liquid, and the other outlet of the three-way reversing valve 5 is connected back to the filtrate cavity of the filter tank 1 through a backwashing pipe 7, and a suction pump 10 is installed on the backwashing pipe 7 to facilitate the use of the suction pump 10 and the water conveying pipe 6 to suck the stored water in the balance tank 8 into the backwashing pipe 7, and the end of the backwashing pipe 7 extends into the top of the filter tank 1 and is connected with a water-driven bin 11.

[0037] Please refer to Figures 2-4 , a central rod 13 is rotatably installed in the water-driven bin 11 through a bearing, and a plurality of wheel blades 12 are fixedly installed on the central rod 13 in the circumferential direction, when the backwashing liquid flows through the water-driven bin 11, the wheel blades 12 are driven to rotate by the impact of the wheel blades 12, and the end of the central rod 13 extending out of the water-driven bin 11 is fixed with a bevel gear 14, a bevel gear ring 15 is engaged with the bevel gear 14, and a rotating ring 16 is fixed to the lower part of the bevel gear ring 15, and the rotating ring 16 is connected with the top cover of the filter tank 1 through a bearing to realize dynamic sealing, and a mechanical seal or a rotating joint can be used as a sealing element 21, and the rotating ring 16 extends downward and is coaxially fixed with the cylindrical filter core 4, so that the filter core 4 can be driven to rotate, and when the filter core 4 rotates, part of the pollutants can be thrown out by using centrifugal force.

[0038] Please refer to Figures 4-8 In the filter cavity, a pair of scrapers 17 is symmetrically installed on the outside of the filter core 4, the scrapers 17 are fixed with the top plate of the filter tank 1, and a scraping strip 18 such as rubber or polyurethane is embedded at one end of the scraper 17 close to the filter core 4, and the length of the scraping strip 18 is slightly greater than the height of the filter core 4 to ensure comprehensive scraping, and a hollow water channel 172 is processed in the inside of the scraper 17, one end of which is connected with the backwashing pipe 7 through a connecting pipe 19, and a row of water spray holes 171 is equidistantly arranged on the side wall of the scraper 17 facing the filter core 4 along the length direction, and the axis direction of the water spray holes 171 is designed to be tangent to the outer surface of the filter core 4 to make the water flow sprayed to produce the maximum shear scouring force.

[0039] As a preferred embodiment, please refer to Figure 7The spray hole 171 can be designed as an inverted trumpet shape, with a conical sealing needle 174 inside that is thin at the head and thick at the tail. The slope of the sealing needle 174 is consistent with the inclined inner wall of the spray hole 171. The tail of the sealing needle 174 is hinged to a movable strip 173 inside the hollow water channel 172. The movable strip 173 is connected to the inner wall of the scraper 17 through a telescopic cover 176. The telescopic cover 176 is equipped with a disc spring 175. When the backwash water pressure is sufficient, the water pressure causes the movable strip 173 to compress the disc spring 175 and move, driving the sealing needle 174 to open the spray hole 171. When the water pressure is insufficient, the disc spring 175 rebounds and pushes the sealing needle 174 to tightly close the spray hole 171.

[0040] Please see Figure 9 At the port where the backflush pipe 7 connects to the water chamber 11, an anti-backflow structure is installed, which consists of a baffle ring 71, a conical block 72 and a compression spring 73. During normal filtration, under the action of elastic force and filtrate pressure, the conical block 72 tightly adheres to the inclined hole of the baffle ring 71 to form a seal, preventing filtrate from flowing into the backflush pipe 7 during normal filtration.

[0041] Please see Figure 1 The top of the filter tank 1 is designed as a split sealing cover 22, which is composed of two half-covers spliced ​​together. The water supply pipe 6 passes through the splice seam of the two half-covers. The sealing cover 22 is bolted to the filter tank 1, which facilitates the inspection and maintenance of the water-powered mechanism on the top of the filter tank 1.

[0042] Working process: During filtration: The three-way reversing valve 5 connects the outlet pipe 3 and the supply pipe 6. The raw liquid enters the filtration chamber from the inlet pipe 2 and passes through the filter element 4 under pressure. The pollutants are trapped on the outer surface of the filter element 4. The clean filtrate enters the filtrate chamber and enters the balance tank 8 through the outlet pipe 3, the three-way reversing valve 5, and the supply pipe 6. Finally, it is output through the drain pipe 9. At this time, the suction pump 10 is turned off, there is no water flow in the backwash pipe 7, the filter element 4 is stationary, the anti-backflow structure is closed, and the water spray hole 171 of the scraper 17 is closed under the action of the disc spring 175.

[0043] When backwashing: when the dirt on the outer wall of the filter core 4 increases and the resistance reaches the set value, an additional differential pressure sensor or timer can be configured to monitor, the system automatically switches the three-way reversing valve 5, connects the water inlet pipe 6 and the backwashing pipe 7, and starts the suction pump 10, which sucks clean filtrate from the balance tank 8, forming a high-speed water flow through the backwashing pipe 7. The high-speed water flow first impacts the blades 12 in the water-driven bin 11, driving the central rod 13 to rotate, which drives the rotating ring 16 and the filter core 4 to rotate through gear transmission. Part of the high-pressure water flows through the connecting pipe 19 into the hollow water channel 172 of the scraper 17, and the water pressure forces the movable strip 173 to compress the disc spring 175, pushing the sealing needle 174 to open the water injection hole 171. The high-pressure water is injected from the water injection hole 171 to the outer surface of the rotating filter core 4 in a tangent direction, and the rotating filter core 4 and the fixed scraper 18 generate a scraping effect, stripping stubborn dirt; at the same time, the high-pressure tangential water jet washes the surface of the filter core 4, and the dirt and waste water washed by the scraper are settled downward under the action of gravity, and finally discharged from the system through the open sewage valve 20 at the bottom. After a period of backwashing, the system switches back to the filtration mode, completing an automatic cleaning cycle.

[0044] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the application is defined by the appended claims, not by the above description, and it is intended to encompass all variations falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be considered as limiting the claims to which they relate.

[0045] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A system with automatic backwash function of filter cartridge, comprising a filter tank (1) and a balance tank (8), characterized in that: The side wall of the filter tank (1) is provided with an inlet pipe (2), a cylindrical filter core (4) is installed in the filter tank (1), the filter core (4) divides the filter tank (1) into an outer filter cavity and an inner filtrate cavity, the filtrate cavity is provided with an outlet pipe (3), the filter cavity is provided with a blowdown valve (20), the outlet pipe (3) is connected with a water feeding pipe (6) and a back flushing pipe (7) through a three-way reversing valve (5), the water feeding pipe (6) is communicated with a balance tank (8), and the balance tank (8) is further provided with a drain pipe (9); A suction pump (10) is installed on the back flushing pipe (7), and the back flushing pipe (7) is communicated with the filtrate cavity through a water driving bin (11), a central rod (13) is rotatably installed in the water driving bin (11), and a plurality of blades (12) are uniformly distributed on the outer wall of the central rod (13) in the circumferential direction, when liquid flows in the back flushing pipe (7), the blades (12) are impacted to drive the central rod (13) to rotate. One end of the central rod (13) extending out of the water driving bin (11) is fixedly provided with a bevel gear (14), the bevel gear (14) is externally meshed with a bevel gear ring (15), the bevel gear ring (15) is fixedly provided with a rotating ring (16), and the rotating ring (16) is rotatably connected with the filter tank (1) and extends into the filter tank (1) to be coaxially fixed with the filter core (4).

2. The system having the function of automatic backwashing of filter core according to claim 1, characterized in that: A pair of scrapers (17) are installed in the filter cavity of the filter tank (1), one end of the scraper (17) close to the filter core (4) is provided with a scraping strip (18) abutting against the filter core (4), and the length of the scraping strip (18) is greater than the length of the filter core (4).

3. The system having the function of automatic backwashing of filter core according to claim 2, characterized in that: A hollow water channel (172) is formed in the scraper (17), one end of the scraper (17) extending out of the filter tank (1) is connected with the back flushing pipe (7) through a connecting pipe (19), a plurality of water injection holes (171) are equidistantly formed in the side wall of the scraper (17) along the length direction and communicated with the hollow water channel (172).

4. The system having the function of automatic backwashing of filter core according to claim 3, characterized in that: The axis of the water injection hole (171) is tangent to the outer surface of the filter core (4).

5. The system having the function of automatic backwashing of filter core according to claim 3, characterized in that: A sealing needle (174) is slidably inserted into the water injection hole (171), and a movable strip (173) is installed in the hollow water channel (172), the sealing needle (174) and the movable strip (173) are hingedly connected, a telescopic cover (176) is installed between the back plate of the scraper (17) and the periphery of the movable strip (173), and a disc spring (175) is installed in the telescopic cover (176).

6. The system having the function of automatic backwashing of filter core according to claim 5, characterized in that: The water injection hole (171) has a reverse-horn-shaped structure with a small outer end and a large inner end, the sealing needle (174) has a conical structure with a thin head end and a thick tail end, and the slope of the sealing needle (174) is consistent with the slope of the inclined surface of the water injection hole (171).

7. The system having the function of automatic backwashing of filter core according to claim 1, characterized in that: A backflow prevention structure is installed in the bottom port of the back flushing pipe (7), the backflow prevention structure comprises a blocking ring (71) and a conical block (72), the blocking ring (71) and the conical block (72) are connected through a spring (73), and a beveled through hole is formed in the blocking ring (71) and is matched and sealed with the conical block (72).

8. The system having the function of automatic backwashing of filter core according to claim 1, characterized in that: The rotating connection of the swivel (16) and the filter tank (1) and the rotating connection of the central rod (13) and the water-driven bin (11) are provided with a sealing element (21), which is a combination of mechanical seal, packing seal and rotary joint.

9. The system having the function of automatic backwashing of filter core according to claim 1, characterized in that: The filter tank (1) is further provided with a sealing cover (22), which is composed of two half covers, and the water delivery pipe (6) penetrates the joint seam of the two half covers.

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