Low-resistance and easy-to-clean frame filter and filtering method

Abstract

The invention discloses a low-resistance and easy-to-clean frame filter and a filtering method, and relates to the technical field of filtering equipment, the frame filter comprises a washing liquid storage tank, a gas-liquid mixing device, a rotary distribution head, a filter plate fixing device, filter cloth, a filter frame, a sieve plate, a washing pipe, a sieve plate supporting sleeve, a filtrate storage tank and a washing nozzle. According to the invention, a material flowing space is constructed between the sieve plates by using the sieve plate supporting sleeve, so that the filtrate flow of a traditional plate-and-frame filter is shortened, and the filtering resistance is obviously reduced; the gas-liquid mixing device is combined with high-pressure gas, so that the cleaning effect is effectively enhanced; after the filter plate fixing device is loosened, the filter cloth and the filter cake can be easily separated and fall off. According to the invention, a traditional plate frame type filter is transformed, so that the formed frame type filter can remarkably reduce the filtering pressure and energy consumption, greatly improve the filtering efficiency and the filter cake washing rate, reduce the maintenance cost and prolong the service life of equipment, and is suitable for various filtering scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of filtering equipment, and in particular to a low-resistance, easy-to-clean frame filter and a filtering method. Background Art

[0002] Plate and frame filters are widely used as a key solid-liquid separation device in numerous fields, including chemical engineering, pharmaceuticals, food processing, and environmental engineering. Traditional plate and frame filters typically utilize plates to support the filter cloth, forcing the liquid through the cloth under pressure. However, this traditional structure has significant drawbacks: the gap between the filter cloth and the support plates is very small. As the filter cake gradually forms during the filtration process, the resistance to filtrate discharge increases significantly. This not only significantly increases filtration energy consumption but also significantly reduces filtration efficiency. Furthermore, the narrow gap between the filter cloth and the support plates makes cleaning and removing the filter cake extremely difficult, requiring significant manpower and material resources. Incomplete cleaning can easily lead to residual impurities, which in turn reduces filtration efficiency and shortens the equipment's lifespan, severely hindering productivity and increasing operating costs. Therefore, effectively reducing resistance during the filtration process, improving cleaning efficiency, and reducing maintenance frequency have become key challenges that need to be addressed. Summary of the Invention

[0003] This invention addresses the technical issues of existing plate-and-frame filters, such as high filtration resistance, low cleaning efficiency, and high maintenance costs, by providing a low-resistance, easily cleanable frame filter and a filtration method. By optimizing the filter frame assembly structure and improving the cleaning system, this technical solution significantly reduces fluid resistance during filtration and achieves efficient cleaning, thereby extending the service life of the equipment.

[0004] To achieve the above object, the present invention is implemented according to the following technical solutions: One of the purposes of the present invention is to provide a low-resistance, easy-to-clean frame filter, including a filter frame mounting device, the filter frame mounting device is used to carry the above-mentioned components and ensure that they maintain a stable connection relationship during operation. The filter frame mounting device has a washing filter frame assembly, a washing water circulation assembly and a filter assembly. The washing filter frame assembly and the filter assembly are both multiple groups, and the multiple groups of the washing filter frame assemblies and the filter assemblies are staggered on the filter frame mounting device. The washing filter frame assembly is used to provide a gap between two adjacent groups of filter assemblies, and the width of the gap is equal to the thickness of the filter assembly to reduce the resistance of the fluid passing through. The washing water outlet of the washing water circulation assembly is connected to the inlet of the washing filter frame assembly for conveying cleaning fluid to achieve a backwashing function.

[0005] The washing liquid storage tank is used to store liquid for cleaning; the gas-liquid mixing device mixes high-pressure gas with the washing liquid to enhance the cleaning effect; the rotating distribution head is used to switch the flow paths of the washing liquid and the filtrate, and control the opening and closing of the flow paths; the filter plate fixing device is used to compress multiple filter frames and sieve plates to ensure the sealing during the filtration process; the filter cloth is installed between the filter frames to achieve filtration of the mixed fluid; the sieve plate is located between the filter cloths to guide the flow of the filtrate and support the filter cloth; the sieve plate support sleeve is arranged between the two sieve plates to support the flow space between the sieve plates; the washing pipe is connected to the rotating distribution head and the washing nozzle for conveying washing liquid; the washing nozzle is installed on the washing pipe to spray cleaning liquid for backwashing; the filtrate storage tank is used to collect the washing liquid generated during the cleaning process.

[0006] Specifically, the washing water circulation assembly includes a washing liquid storage tank, a gas-liquid mixing device, a rotary distribution head, and a filtrate storage tank. The washing liquid storage tank stores washing liquid, the gas-liquid mixing device stores high-pressure gas, the outlets of the washing liquid storage tank and the gas-liquid mixing device are connected to the washing water inlet of the washing filter frame assembly through the rotary distribution head, and the waste liquid outlet of the filter frame mounting device is connected to the inlet of the filtrate storage tank. The washing liquid storage tank is used to store the washing liquid, and the washing liquid can be prepared by adding cleaning agents according to actual needs. The gas-liquid mixing device forms a high-speed fluid by mixing high-pressure gas with the washing liquid, thereby enhancing the impact force of the washing liquid. The rotary distribution head acts as a flow path switching device, closing the washing liquid outlet and opening the filtrate outlet during the filtration stage, and the opposite during the cleaning stage, to ensure that the filtration and cleaning processes do not interfere with each other. The filtrate storage tank is used to collect the waste liquid generated during the cleaning process, and a discharge port is provided at the bottom for regular cleaning.

[0007] Specifically, the washing filter frame assembly includes a filter frame, sieve plates, a washing pipe, a sieve plate support sleeve, and a washing nozzle. The sieve plates are two in number, with multiple sieve plate support sleeves positioned between them. The washing pipe is located in the gap between the two sieve plates, and multiple washing nozzles are evenly distributed on the washing pipe. The inlet of the washing pipe is connected to the washing water outlet of the rotating distribution head. The sieve plates, washing pipe, sieve plate support sleeve, and washing nozzles are fixedly mounted within the filter frame, and the filter assembly is positioned outside the sieve plates. The filter frame serves as a framework structure to accommodate the internal components and secure them in place. Multiple sieve plate support sleeves create a flow space between the two sieve plates. This design significantly reduces resistance to liquid flow by optimizing the flow space. The washing pipe runs through the gap between the two sieve plates, and multiple washing nozzles are evenly distributed on the sieve plate surface to deliver cleaning fluid to the sieve plate surface for backwashing. The number and position of the washing nozzles can be flexibly adjusted according to actual needs to ensure that the cleaning fluid is evenly sprayed onto the sieve plate surface, effectively preventing residue accumulation.

[0008] Specifically, the filter assembly includes multiple filter cloths, two of which are positioned outside the two sieve plates, forming a filter cake between the two filter cloths. Depending on the characteristics of the liquid to be filtered, the filter cloth material is selected to meet the actual needs of different application scenarios, such as polyester fiber, nylon, or stainless steel mesh.

[0009] The frame filter is divided into a filtration phase and a filter cake washing phase. During the filtration phase, the liquid to be filtered enters between the two filter cloths. After being filtered by the filter cloths and filter cake, the filtrate passes through the sieve plates and enters the center of the two sieve plates before being discharged. Multiple sieve plate support sleeves create a large flow space between the two sieve plates, significantly reducing filtration resistance. During the washing phase, the cleaning liquid in the washing liquid storage tank is mixed with high-pressure gas through a gas-liquid mixing device and then injected into the washing pipe through a rotating distribution head. At this time, the rotating distribution head closes the filtrate outlet and opens the cleaning liquid outlet. The cleaning liquid is sprayed through the washing nozzle, backwashing the sieve plates from the liquid outlet to the liquid inlet. After loosening the filter plate fixing device, the two filter cloths separate, the filter cake falls off, and the filter cake washing liquid is discharged into the filtrate storage tank for storage.

[0010] Another object of the present invention is to provide a filtering method for the above-mentioned frame filter: the liquid to be filtered enters the filter plate fixing device through the control of the rotating distribution head, and is distributed between the gaps of the filter cloth, forming a filter cake between the two sieve plates, and the filter cake continues to filter smaller particles. After being filtered by the filter cloth, the liquid passes through the sieve plate and enters between the two sieve plates, and is discharged through the filtered water outlet provided at the lower end of the filter plate fixing device, thereby completing the filtration.

[0011] Specifically, to overcome the technical drawback of prior art, where the small gap between the filter cloth and filter plate makes cleaning difficult, the present invention incorporates sieve plate support sleeves to increase the distance between the sieve plates, thereby providing a larger circulation area for the cleaning fluid. Furthermore, by optimizing the design of the filter plate fixing mechanism, the two filter cloths can be separated by loosening the fixture during cleaning, facilitating the removal of the filter cake. This design significantly improves cleaning efficiency and reduces maintenance costs.

[0012] Furthermore, the present invention provides specific structural improvements to achieve superior cleaning results. The gas-liquid mixing device adjusts the pressure and flow rate of the high-pressure gas to further enhance the impact and coverage of the cleaning liquid. The number and position of the cleaning nozzles can be adjusted according to actual needs to ensure that the cleaning liquid evenly covers the entire sieve plate surface. Furthermore, the height and number of the sieve plate support sleeves can be flexibly selected to accommodate the filtration requirements of liquids with different viscosities and solid contents.

[0013] Compared with the prior art, the present invention has the following beneficial effects: First, the present invention significantly reduces filtration resistance and effectively improves filtration efficiency. By innovatively providing sieve plate support sleeves, the flow space between the sieve plates is greatly increased, avoiding the problem of excessive filtration resistance caused by the small gap between the filter cloth and the support plate in traditional plate and frame filters. This makes the filtration process smoother and more efficient, allowing liquid to pass through the filter cloth and sieve plates more quickly to be filtered, and the filtration efficiency has achieved a qualitative leap compared to traditional equipment.

[0014] Secondly, the cleaning effect has been revolutionized, significantly reducing maintenance costs and frequency. A gas-liquid mixing device, combined with high-pressure gas, generates a powerful impact force, providing comprehensive and in-depth cleaning of the sieve plates. Furthermore, the optimized filter plate fixture design allows for easy separation of the two filter cloths and convenient removal of the filter cake, eliminating the time-consuming and laborious cleaning operations required by traditional equipment. This significantly shortens cleaning time, reduces manual intervention, and significantly reduces maintenance costs, ensuring long-term, stable operation of the equipment.

[0015] Furthermore, the service life of the equipment is significantly extended. Due to the reduced filtration resistance and improved cleaning effect, the pressure and wear on the various components of the equipment are greatly reduced, effectively avoiding component damage caused by frequent high-pressure filtration and difficult cleaning. This extends the overall service life of the equipment, reduces the frequency of equipment upgrades, and saves companies a large amount of equipment investment costs.

[0016] Furthermore, the present invention boasts excellent adaptability and flexibility. By simply adjusting the pressure parameters of the gas-liquid mixing device, the number of sieve plate support sleeves, and the layout of the washing nozzles, various filtration requirements can be met for liquids of varying viscosities and solids contents. This enables widespread application in various industries, including chemical, pharmaceutical, food, and environmental protection, providing a powerful and reliable filtration solution for enterprise production operations. Its application prospects are vast, and it will play a significant role in promoting technological advancement and industrial upgrading in related industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the washing type filter frame assembly of the present invention; Figure 3 This is a schematic diagram of the internal structure of the washing filter frame assembly of the present invention; Figure 4 It is a side structural schematic diagram of the washing type filter frame assembly in the present invention.

[0018] In the figure: 1. Washing liquid storage tank; 2. Gas-liquid mixing device; 3. Rotating distribution head; 4. Filter plate fixing device; 5. Filter cloth; 6. Filter frame; 7. Sieve plate; 8. Filter cake; 9. Washing pipe; 10. Sieve plate support sleeve; 11. Filtrate storage tank; 12. Washing nozzle. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0020] The present invention proposes a frame filter with low resistance and easy cleaning characteristics, such as Figure 1-4 As shown, the filter of the present invention includes a filter frame mounting device comprising a washable filter frame assembly, a wash water circulation assembly, and a filter assembly. Both the washable filter frame assembly and the filter assembly are arranged in multiple groups, staggered on the filter frame mounting device. The washable filter frame assembly is designed to ensure a gap between adjacent filter assembly groups, with the gap width approximately equal to the thickness of the filter assembly. The outlet of the wash water circulation assembly is closely connected to the inlet of the washable filter frame assembly, thereby ensuring smooth circulation of wash water. Through rational design and layout, these components form a complete filtration and cleaning system. Both the washable filter frame assembly and the filter assembly are arranged in multiple groups, staggered on the filter frame mounting device, creating a gap between adjacent filter assembly groups, with the gap width equal to the thickness of the filter assembly. This design significantly reduces resistance to liquid flow while providing a larger flow area for the cleaning fluid. The cleaning fluid outlet of the wash water circulation assembly is connected to the inlet of the washable filter frame assembly, ensuring efficient delivery of cleaning fluid to the filtration area for backwashing.

[0021] Specifically, the washing water circulation component includes a washing liquid storage tank 1, a gas-liquid mixing device 2, a rotary distribution head 3, and a filtrate storage tank 11. The washing liquid storage tank 1 stores washing liquid, and the gas-liquid mixing device 2 stores high-pressure gas. The outlets of the washing liquid storage tank 1 and the gas-liquid mixing device 2 are connected to the washing water inlet of the washing filter frame assembly through the rotary distribution head 3. The waste liquid outlet of the filter frame installation equipment is connected to the inlet of the filtrate storage tank 11, thereby realizing effective collection of waste liquid. The washing liquid storage tank 1 is responsible for storing the washing liquid, and the user can add an appropriate amount of cleaning agent according to actual needs to enhance the cleaning effect. The gas-liquid mixing device 2 forms a high-speed fluid by mixing high-pressure gas with the washing liquid, which improves the impact efficiency of the cleaning liquid and expands its coverage area. The rotary distribution head 3 acts as a flow path switching device, closing the washing liquid outlet and opening the filtrate outlet during the filtration stage, and the opposite during the cleaning stage, ensuring that the filtration and cleaning processes are carried out independently and do not interfere with each other. For example, when filtering is required, the rotary distribution head 3 opens the filtrate outlet and closes the cleaning liquid outlet, allowing the filtered liquid to smoothly enter the gaps between the filter cloths and complete the filtration process. When cleaning is required, the rotary distribution head 3 switches the flow path, closing the filtrate outlet and opening the cleaning liquid outlet, allowing the cleaning liquid to pass through the washing pipe 9 and washing nozzle 12 for backwashing. The filtrate storage tank 11 is used to collect waste liquid generated during the cleaning process. A discharge port is provided at the bottom for regular cleaning to prevent waste liquid accumulation from affecting equipment operation.

[0022] The washing filter frame assembly includes a filter frame 6, a sieve plate 7, a washing pipe 9, a sieve plate support sleeve 10, and a washing nozzle 12. There are two sieve plates 7, with multiple sieve plate support sleeves 10 positioned between them. The washing pipe 9 is located in the gap between the two sieve plates 7, and multiple washing nozzles 12 are evenly distributed on the washing pipe 9. The inlet of the washing pipe 9 is connected to the washing water outlet of the rotary distribution head 3. The sieve plates 7, washing pipe 9, sieve plate support sleeves 10, and washing nozzles 12 are fixedly mounted within the filter frame 6. The filter assembly is located outside the sieve plates 7. The filter frame 6 serves as a framework structure, housing the internal components and securing them in place to prevent them from shifting or loosening during operation. Multiple sieve plate support sleeves 10 create a flow space between the two sieve plates 7, significantly reducing liquid flow resistance. The height and number of the sieve plate support sleeves 10 can be flexibly adjusted according to actual needs. For example, when processing high-viscosity liquids, the number of support sleeves can be increased to further increase the flow area, adapting to the needs of different application scenarios. The washing pipe 9 runs through the gap between the two sieve plates 7 and is equipped with multiple evenly distributed washing nozzles 12, which deliver cleaning fluid to the sieve plate surfaces for backwashing. The number and location of the washing nozzles 12 are optimized based on actual needs to ensure that the cleaning fluid evenly covers the entire sieve plate surface and prevent residue accumulation. For example, when processing liquids containing a large amount of residue, the number of washing nozzles 12 can be increased at the edge of the sieve plates 7 to prevent residue accumulation at the edges.

[0023] The filter assembly includes multiple filter cloths 5, two of which are positioned outside the gap between two sieve plates 7. A filter cake 8 forms between the two filter cloths 5. The material of the filter cloths 5 is selected based on the characteristics of the liquid to be filtered, such as polyester fiber, nylon, or stainless steel mesh, to suit the needs of different application scenarios. For example, in the pharmaceutical industry, corrosion-resistant stainless steel mesh filter cloths 5 are used to filter liquid injections to ensure that impurities are not introduced during the filtration process to contaminate the liquid. In the food industry, for juice clarification and filtration, easy-to-clean polyester fiber filter cloths 5 are used to prevent cross-contamination.

[0024] The filtering method of the above frame filter is as follows: The liquid to be filtered enters the filter plate fixing device 4 through the regulation of the rotating distribution head 3, and is then evenly distributed in the gaps of the filter cloth 5, forming a filter cake 8 between the two sieve plates 7. Smaller particles are further filtered through the filter cake 8. After being filtered by the filter cloth 5, the liquid passes through the sieve plate 7 and enters between the two sieve plates 7. It is discharged through the filtered water outlet provided at the lower end of the filter plate fixing device 4, completing the filtration.

[0025] Filtration Stage: The liquid to be filtered enters the filter plate fixture 4 through the control of the rotary distribution head 3 and is evenly distributed in the gaps between the filter cloths 5, forming a filter cake 8 between the two sieve plates 7. After being filtered by the filter cloths 5, the liquid passes through the sieve plates 7, enters between the two sieve plates 7, and is discharged through the filtered water outlet provided at the lower end of the filter plate fixture 4, completing the filtration process. During this stage, the sieve plate support sleeve 10 plays a crucial role, effectively expanding the flow area between the two sieve plates 7, thereby avoiding the problem of excessive filtration pressure caused by the narrow flow path in traditional plate and frame filters.

[0026] Cleaning stage: Close the filtrate outlet and open the cleaning liquid outlet. The cleaning liquid in the cleaning liquid storage tank 1 is mixed with the high-pressure gas through the gas-liquid mixing device 2 and injected into the washing pipe 9. The cleaning liquid is sprayed out through the washing nozzle 12 to backwash the sieve plate 7 from the liquid outlet side to the liquid inlet side. Loosen the filter plate fixing device 4 to separate the two filter cloths 5. The filter cake 8 falls off and is discharged into the filtrate storage tank 11 for storage along with the cleaning waste liquid. During this process, the pressure parameters of the gas-liquid mixing device 2 can be adjusted according to actual needs. For example, for liquids with higher viscosity, the pressure of the high-pressure gas can be appropriately increased to enhance the impact of the cleaning liquid.

[0027] During the specific implementation process, the core components of the present invention include a washing liquid storage tank 1, a gas-liquid mixing device 2, a rotary distribution head 3, a filter plate fixing device 4, a filter cloth 5, a filter frame 6, a sieve plate 7, a washing pipe 9, a sieve plate support sleeve 10, a filtrate storage tank 11 and a washing nozzle 12. The washing liquid storage tank 1 is used to store the washing liquid, which can be clean water or a proper amount of detergent can be added according to actual needs. The gas-liquid mixing device 2 forms a high-speed fluid by mixing high-pressure gas with the washing liquid, thereby improving the cleaning effect. The rotary distribution head 3 serves as a flow path switching device, which closes the washing liquid outlet and opens the filtrate outlet during the filtration stage, and the opposite is true during the cleaning stage, ensuring that the filtration and cleaning processes do not interfere with each other. The filter plate fixing device 4 adopts a bolt clamping structure to ensure that the multiple filter frames 6 and sieve plates 7 remain sealed during the filtration process, and can be quickly loosened during cleaning to separate the filter cloth 5.

[0028] The filter cloth 5 is installed between the two filter frames 6. Its material is selected according to the characteristics of the liquid to be filtered. Materials such as polyester fiber, nylon or stainless steel wire mesh can be used. The main function of the filter cloth 5 is to filter the liquid and intercept solid particles to form a filter cake 8. The sieve plate 7 is cleverly placed between the two filter cloths 5, which not only guides the smooth flow of the filtrate, but also provides solid support for the overall structure. The sieve plate 7 is made of high-strength corrosion-resistant material and has evenly distributed small holes on the surface to promote liquid circulation. The sieve plate support sleeve 10 stands flexibly between the two sieve plates 7, and is welded or threaded to ensure stability. Its height and number can be flexibly adjusted as needed. The function of the sieve plate support sleeve 10 is to increase the space between the two sieve plates 7, thereby reducing the liquid flow resistance and providing a larger circulation area for the cleaning liquid.

[0029] A washing pipe 9 runs through the two sieve plates 7 and is equipped with multiple washing nozzles 12. The number and placement of these nozzles 12 have been carefully planned and optimized to ensure that the cleaning liquid evenly and thoroughly covers every inch of the sieve plates 7. The spray angle and flow rate of the washing nozzles 12 can be controlled by adjusting the pressure parameters of the gas-liquid mixing device 2. A filtrate storage tank 11 collects waste liquid generated during the cleaning process. Its capacity is determined by the scale of the equipment and its frequency of use, and a drain port is provided at the bottom for regular cleaning.

[0030] During the filtration phase, the liquid to be filtered enters through the gap between the two filter cloths 5. After being filtered by the filter cloths 5, solid particles are trapped between the two filter cloths 5 to form a filter cake 8. The filtrate then passes through the small holes in the sieve plates 7 and into the middle area between the two sieve plates 7 before being discharged. The presence of the sieve plate support sleeve 10 significantly increases the flow space between the two sieve plates 7, avoiding the problem of excessive filtration pressure caused by a narrow flow path. This design not only improves filtration efficiency but also reduces equipment operating energy consumption.

[0031] After the filtration operation is completed, the cleaning stage begins. At this time, the filtrate outlet needs to be closed and the cleaning liquid outlet opened so that the cleaning liquid in the cleaning liquid storage tank 1 is fully mixed with the high-pressure gas through the gas-liquid mixing device 2, and then accurately injected into the washing pipe 9 through the rotating distribution head 3. At this time, the cleaning liquid is strongly ejected through the washing nozzle 12, and a backwash operation is performed from the liquid outlet side to the liquid inlet side of the sieve plate 7. During the backwashing process, the high-speed impact force of the cleaning liquid will wash away the residue attached to the surface of the sieve plate 7, and at the same time, the filter plate fixing device 4 is loosened to separate the two filter cloths 5, allowing the filter cake 8 to fall off smoothly. The fallen filter cake 8 is discharged into the filtrate storage tank 11 for storage along with the cleaning waste liquid.

[0032] In order to further improve the cleaning effect, the pressure parameters of the gas-liquid mixing device 2 can be adjusted according to actual needs. For liquids with higher viscosity, the pressure of the high-pressure gas can be appropriately increased to enhance the impact force of the cleaning liquid; for liquids with a large amount of slag, the flow area can be further increased by increasing the number of sieve plate support sleeves 10. In addition, the number and layout of the washing nozzles 12 can also be flexibly adjusted to ensure that the cleaning liquid can be evenly distributed on the entire surface of the sieve plate 7. For example, when processing high-concentration liquids, the number of washing nozzles 12 can be increased in the edge area of the sieve plate 7 to prevent residue accumulation at the edge.

[0033] In practical applications, the frame filter of the present invention is suitable for a variety of industries, such as the chemical, pharmaceutical, food, and environmental protection sectors. For example, in the filtration process of injection liquids in pharmaceutical factories, the present invention significantly reduces equipment maintenance frequency by reducing filtration resistance and improving cleaning efficiency. In the food industry, the present invention can be used for juice clarification and beverage filtration, and its efficient backwash system can quickly remove residues on the sieve plate 7, avoiding cross contamination. In the environmental protection field, the present invention can be used for solid-liquid separation in sewage treatment processes, and its large flow area design can effectively meet the filtering needs of high-solids liquids.

[0034] In order to verify the practical effect of the present invention, multiple groups of comparative experiments were carried out, and the experimental methods are as follows: Test equipment: Control group: traditional plate and frame filter (5mm filter plate gap, no gas-liquid mixing and cleaning); Experimental group: equipment of the present invention (sieve plate support sleeve height 15 mm, gas-liquid mixing pressure 0.4 MPa).

[0035] Data collection: Filtration rate / energy consumption: real-time recording via flow meter, pressure sensor and electric meter; Cleaning effect: The residual solids are measured by weighing method, and the cleanliness of the filter cloth is observed by high-definition endoscope; Filter cake shedding: Count the percentage of automatic shedding area.

[0036] The experimental data are shown in the following table: Table 1: Comparative filtration performance test data (treating the same material: 10% CaCO3 suspension, viscosity 120 mPa·s) Table 2: Comparative experimental data of cleaning effect (cleaning filter cake formed by 10% CaCO3 suspension) According to the experimental results in Table 1 and Table 2, compared with the traditional plate and frame filter, the filtration energy consumption ratio of the present invention is reduced by about 30%, and the filtration efficiency is increased by about 20%. In the cleaning stage, the performance of the present invention is particularly outstanding, the cleaning time is shortened by 40%, and the filter cake falls off more thoroughly, thereby greatly reducing the need for manual intervention. For example, in the sewage treatment process in the environmental protection field, the frame filter of the present invention can efficiently cope with the filtration needs of high-solid content liquids, and its large flow area design effectively reduces the filtration resistance and improves the filtration efficiency. At the same time, the efficient backwash system can quickly remove the residue on the sieve plate 7, avoid cross contamination, and extend the service life of the equipment. These data fully demonstrate the superiority of the present invention in reducing filtration resistance and improving cleaning efficiency.

[0037] In addition, the present invention has good adaptability and flexibility. For liquids with different viscosities and solid contents, diversified filtration requirements can be achieved by simply adjusting the pressure parameters of the gas-liquid mixing device 2, the number of sieve plate support sleeves 10, and the layout of the washing nozzles 12. For example, in the chemical industry, the present invention can be used for filtering chemical solutions under high temperature and high pressure conditions. By selecting high-temperature resistant materials to make the sieve plate 7 and filter cloth 5, and appropriately increasing the number of sieve plate support sleeves 10 to meet the filtration needs of high-viscosity liquids. In the pharmaceutical industry, the present invention significantly reduces the frequency of equipment maintenance by reducing filtration resistance and improving cleaning efficiency, saving operating costs for enterprises.

[0038] In summary, the present invention greatly widens the flow space between the two sieve plates 7 by virtue of the innovative design of the sieve plate support sleeve 10, effectively avoiding the problem of excessive filtration resistance caused by the narrow gap between the filter cloth and the support plate in traditional plate and frame filters, thereby ensuring the smoothness and efficiency of the filtration process. At the same time, the gas-liquid mixing device 2 is combined with high-pressure gas to generate a powerful impact force to perform a full-scale and deep cleaning of the sieve plate 7. The optimized design of the filter plate fixing device 4 allows the two filter cloths 5 to be separated smoothly during cleaning, further improving the convenience of the filter cake 8 falling off. These improvements not only significantly reduce the filtration resistance and maintenance costs, but also extend the service life of the equipment, providing efficient and reliable filtration solutions for the chemical, pharmaceutical, food, environmental protection and other industries.

[0039] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Any technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A low-resistance, easy-to-clean frame filter, characterized by: It includes a filter frame installation device, which has a washing filter frame assembly, a cleaning water circulation assembly and a filter assembly. The washing filter frame assembly and the filter assembly are both multiple groups, and the multiple groups of washing filter frame assemblies and the filter assemblies are staggered on the filter frame installation device. The washing filter frame assembly is used to create a gap between two adjacent groups of filter assemblies, and the width of the gap is equal to the thickness of the filter assembly. The cleaning water outlet of the cleaning water circulation assembly is connected to the inlet of the washing filter frame assembly.

2. The low-resistance, easy-to-clean frame filter according to claim 1, characterized in that: The washing water circulation assembly comprises a washing liquid storage tank (1), a gas-liquid mixing device (2), a rotary distribution head (3), and a filtrate storage tank (11); the washing liquid storage tank (1) stores washing liquid; the gas-liquid mixing device (2) stores high-pressure gas; the outlets of the washing liquid storage tank (1) and the gas-liquid mixing device (2) are connected to the washing water inlet of the washing filter frame assembly through the rotary distribution head (3); and the filtrate discharge outlet of the filter frame mounting device is connected to the inlet of the filtrate storage tank (11).

3. The low-resistance, easy-to-clean frame filter according to claim 2, characterized in that: The washing filter frame assembly comprises a filter frame (6), a sieve plate (7), a washing pipe (9), a sieve plate supporting sleeve (10), and a washing nozzle (12). The sieve plates (7) are two, and a plurality of sieve plate supporting sleeves (10) are arranged between the two sieve plates (7). The washing pipe (9) is located in the gap between the two sieve plates (7). A plurality of washing nozzles (12) are evenly distributed on the washing pipe (9). The inlet of the washing pipe (9) is connected to the washing water outlet of the rotary distribution head (3). The sieve plate (7), the washing pipe (9), the sieve plate supporting sleeve (10), and the washing nozzle (12) are fixedly arranged in the filter frame (6), and the filter assembly is arranged on the outside of the sieve plate (7).

4. The low-resistance, easy-to-clean frame filter according to claim 3, characterized in that: The filter assembly comprises a plurality of filter cloths (5), two of the filter cloths (5) are respectively arranged on the outside between the two sieve plates (7), and a filter cake (8) is formed on the outside between the two filter cloths (5).

5. The filtering method of the low-resistance, easy-to-clean frame filter according to any one of claims 1 to 4, characterized in that: The liquid to be filtered enters the filter plate fixing device through the control of the rotating distribution head and is distributed between the gaps of the filter cloth, forming a filter cake between the two sieve plates. Smaller particles continue to be filtered through the filter cake. After being filtered by the filter cloth, the liquid passes through the sieve plate and enters between the two sieve plates. It is discharged through the filtered water outlet set at the lower end of the filter plate fixing device, completing the filtration.

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