Self-cleaning rotary filter cartridge

Abstract

This utility model discloses a self-cleaning rotary filter element, comprising: a cylindrical outer shell, including an air inlet arranged along the tangential direction of the cylindrical outer shell and an air outlet arranged along the axial direction of the cylindrical outer shell; a hollow shaft, which is aligned with the axial direction of the cylindrical outer shell and rotatably connected to the cylindrical outer shell; the hollow shaft is provided with air holes evenly distributed along the circumference of the shaft, and the open end of the hollow shaft is connected to the air outlet; filter blades, which are connected to the hollow shaft and completely cover the air holes; the filter blades are used to filter dust in the air; the filter blades are at least partially located in the air intake path of the air inlet, so that the incoming airflow can drive the hollow shaft to rotate when it impacts the filter blades. In this utility model, the rotational movement of the filter blades generates centrifugal force during operation, which can dislodge dust deposited on the surface of the filter media, thereby achieving a self-cleaning effect and enhancing the service life of the filter media.

Description

Technical Field

[0001] This utility model relates to the field of filtration technology, and in particular to a self-cleaning rotary filter element. Background Technology

[0002] In existing air filtration devices, filter elements typically employ a fixed structure, relying on stationary filter media to block dust and impurities in the incoming airflow. These static filter elements offer good filtration performance initially, but as dust accumulates, the dust layer on their surface gradually thickens, leading to a rapid increase in airflow pressure drop and increased airflow resistance. This ultimately reduces filtration efficiency and can even cause blockages. This situation is particularly pronounced in gas monitoring systems in high-dust environments such as power plants, cement plants, mines, and Ganoderma lucidum factory cultivation, requiring frequent filter element replacements. This not only increases maintenance workload and consumable costs but also easily causes monitoring interruptions. Especially under high humidity or condensate-containing conditions, traditional filter elements are prone to failure and cannot operate stably for extended periods. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a self-cleaning rotary filter element that can improve the service life of the filter medium.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A self-cleaning rotary filter element, comprising: A cylindrical outer shell includes an air inlet disposed along the tangential direction of the cylindrical outer shell and an air outlet disposed along the axial direction of the cylindrical outer shell; The hollow shaft is aligned with the axis of the cylindrical outer shell and rotatably connected to the cylindrical outer shell; the hollow shaft is provided with air holes evenly distributed along the circumference of the shaft body, and the open end of the hollow shaft is connected to the air outlet; A filter blade is connected to the hollow shaft and completely covers the air pores; the filter blade is used to filter dust in the air; the filter blade is at least partially located in the air intake path of the air inlet so that the incoming airflow can drive the hollow shaft to rotate when it impacts the filter blade.

[0005] In some embodiments, a chamber is also included, which is assembled and connected to the end of the cylindrical outer shell away from the air outlet and communicates with the cylindrical outer shell.

[0006] In some embodiments, a support is also included, the support comprising a rotary joint and a cone; The cone is engaged with the chamber; one end of the rotary joint is rotatably connected to the top of the cone, and the other end is rotatably connected to the end of the hollow shaft away from the air outlet.

[0007] In some embodiments, the cone is provided with vents along the conical surface.

[0008] In some embodiments, the support further includes a filter layer that abuts against and completely covers the pores located on the cone facing the cylindrical outer shell.

[0009] In some embodiments, a sealing ring is also included, which abuts against the tail end of the cone and the inner wall of the chamber, respectively.

[0010] In some embodiments, the bottom of the silo is provided with a drain outlet.

[0011] In some embodiments, the number of filter blades is greater than or equal to two, and the plurality of filter blades are arranged circumferentially along the hollow axis, and the plurality of filter blades are arranged integrally or separately.

[0012] In some embodiments, the filter blades are detachably connected to the hollow shaft.

[0013] In some embodiments, the plurality of filter blades are arranged in a spiral or a polygonal star shape.

[0014] The beneficial effects of this utility model are as follows: It provides a self-cleaning rotary filter element. By setting a tangential air inlet and an axial air outlet on the cylindrical shell, the incoming airflow not only enters the filter element but also applies torque to the blades under tangential impact, thereby driving the hollow shaft to rotate. This arrangement of the air inlet and outlet directions fully utilizes the airflow energy and improves the rotational driving force. This rotational motion causes the filter blades to generate centrifugal force during operation, which can dislodge dust deposited on the surface of the filter media, thus achieving a self-cleaning effect and extending the service life of the filter media. Furthermore, by limiting the diameter, the effective filtration area is increased, resulting in more thorough filtration and reduced energy consumption and pressure drop. The evenly distributed pores on the hollow shaft are completely covered by the filter blades, ensuring that the airflow must pass through the filter media to enter the hollow shaft and then exit through the outlet, avoiding secondary pollution caused by bypassing the filter media. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a self-cleaning rotary filter element according to an embodiment of the present utility model; Figure 2 This is a top view of a self-cleaning rotary filter element according to an embodiment of the present utility model; Figure 3 for Figure 2 Sectional view AA; Figure 4 for Figure 3 Enlarged view of part B; Figure 5This is a front view of a self-cleaning rotary filter element according to an embodiment of the present utility model; Figure 6 for Figure 5 sectional view CC; Label Explanation: 1. Cylindrical outer shell; 11. Air inlet; 12. Air outlet; 2. Hollow shaft; 3. Filter blades; 4. Air pores; 5. Chamber; 51. Drain outlet; 6. Support; 61. Rotary joint; 62. Cone; 63. Filter layer; 7. Sealing ring. Detailed Implementation

[0016] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0017] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0018] In existing technologies, commonly used filter elements are mostly static cylindrical or sheet-like structures, relying primarily on filter materials to intercept dust and impurities in the airflow. While these filter elements have a simple structure, after prolonged use, they are prone to problems such as excessive dust accumulation on the filter surface, rapid increase in pressure drop, and increased airflow resistance, leading to decreased filtration efficiency and even system blockage, which is detrimental to the continuous and stable operation of the equipment. Especially in high-dust or high-humidity environments, such as power plant flue gas emission monitoring and online detection systems in cement plants and mines, traditional static filter elements are more prone to failure due to dust accumulation or condensate intrusion, requiring frequent replacement, resulting in high maintenance costs and long downtime. Furthermore, in applications such as automotive engine testing, medical laboratory air sampling, and residential ventilation systems, existing filter elements also generally suffer from limited filtration area, short lifespan, and inconvenient maintenance, failing to meet the practical requirements for long-term operation, low energy consumption, and high reliability. Therefore, how to maintain high-efficiency filtration performance while effectively preventing filter blockage, extending service life, and reducing maintenance costs has become a pressing technical problem to be solved in this field.

[0019] To at least solve the above problems, please refer to Figures 1 to 3 This utility model embodiment provides a self-cleaning rotary filter element, comprising: The cylindrical outer shell 1 includes an air inlet 11 arranged along the tangential direction of the cylindrical outer shell 1 and an air outlet 12 arranged along the axial direction of the cylindrical outer shell 1. The hollow shaft 2 is aligned with the axis of the cylindrical outer shell 1 and rotatably connected to the cylindrical outer shell 1; the hollow shaft 2 is provided with air holes 4 evenly distributed along the circumference of the shaft body, and the open end of the hollow shaft 2 is connected to the air outlet 12; The filter blade 3 is connected to the hollow shaft 2 and completely covers the air hole 4; the filter blade 3 is used to filter dust in the air; the filter blade 3 is at least partially located in the air intake path of the air inlet 11 so that the incoming airflow can drive the hollow shaft 2 to rotate when it impacts the filter blade 3.

[0020] As described above, the beneficial effects of this invention are as follows: By providing a tangential air inlet 11 and an axial air outlet 12 on the cylindrical outer shell 1, the incoming airflow not only enters the filter element but also applies torque to the blades under tangential impact, thereby driving the hollow shaft 2 to rotate. This rotational motion causes the filter blades 3 to generate centrifugal force during operation, which can dislodge dust deposited on the surface of the filter media, thus achieving a self-cleaning effect and enhancing the service life of the filter media. The evenly distributed pores 4 on the hollow shaft 2 are completely covered by the filter blades 3, ensuring that the airflow must pass through the filter media to enter the hollow shaft 2 and then exit through the air outlet 12, avoiding secondary pollution caused by circling the filter media. Compared with traditional static filter elements, this solution significantly improves anti-clogging capability and continuous service life.

[0021] Preferably, the diameter of the air inlet 11 is larger than the diameter of the air outlet 12; by limiting the diameter, the effective filtration area is increased, making filtration more thorough and reducing energy consumption and pressure drop.

[0022] Please refer to Figures 1 to 3 In some embodiments, a chamber 5 is also included, which is assembled and connected to the end of the cylindrical outer shell away from the air outlet 12 and communicates with the cylindrical outer shell.

[0023] As described above, the addition of chamber 5 creates a unified filter housing with a lower dust collection space. Chamber 5 is fitted to the end of the housing furthest from the outlet 12, receiving and collecting dust particles and condensate droplets ejected during rotation. Through gravity, these impurities settle at the bottom of chamber 5, preventing them from re-entering the airflow path and thus enhancing the separation effect. The design of chamber 5 reduces the burden on the filter element and makes maintenance more convenient; users can periodically open chamber 5 for cleaning. This structure combines rotary centrifugal separation with the settling chamber 5, further improving dust removal efficiency and filter lifespan.

[0024] Please refer to Figures 1 to 4 In some embodiments, a bracket 6 is also included, which includes a rotating joint 61 and a cone 62; The cone 62 is snapped into the chamber 5; one end of the rotating joint 61 is rotatably connected to the top of the cone 62, and the other end is rotatably connected to the end of the hollow shaft 2 away from the air outlet 12.

[0025] As described above, the support 6 ensures the stability of the hollow shaft 2 during rotation. The support 6 consists of a cone 62 and a rotating joint 61. The cone 62 engages with the chamber 5 to ensure stable support, while the rotating joint 61 connects to the top of the cone 62 and the tail end of the hollow shaft 2, respectively, allowing the hollow shaft 2 to rotate freely. This prevents the hollow shaft 2 from eccentrically vibrating due to uneven airflow or friction during long-term operation of the filter element, improving overall reliability and rotational balance. The support 6 ensures the mechanical stability of the rotating filter element, preventing damage to the filter media or seal failure due to rotational vibration.

[0026] Please refer to Figure 3 and Figure 4 In some embodiments, the cone 62 is provided with vents 4 along the conical surface.

[0027] As described above, the through-holes 4 on the cone 62 allow airflow to pass through and further scour the cone 62, preventing dead zones in the airflow. Simultaneously, the through-holes 4 also serve a sewage discharge function. When airflow enters through the through-holes 4 of the cone 62, it carries some dust and condensate down to the chamber 5, preventing accumulation at the cone 62 and extending its service life.

[0028] Please refer to Figure 3 and Figure 4 In some embodiments, the support 6 further includes a filter layer 63 that abuts against the side of the cone 62 facing the cylindrical outer shell 1 and completely covers the pores 4 located on the cone 62.

[0029] As described above, adding a filter layer 63 to the outside of the air holes 4 of the cone 62 can further filter the airflow passing through the air holes 4, preventing fine dust particles or impurities from entering the support 6 and bearing area, thus providing protection. At the same time, after the filter layer 63 covers the air holes 4, it can also stabilize the airflow distribution, making the overall aerodynamics more uniform.

[0030] Please refer to Figure 3 In some embodiments, a sealing ring 7 is also included, which abuts against the tail end of the cone 62 and the inner wall of the chamber 5 respectively.

[0031] As described above, a sealing ring 7 is installed between the tail end of the cone 62 and the inner wall of the chamber 5, effectively preventing unfiltered airflow or dust from entering the joint between the chamber 5 and the support 6, thus ensuring the airtightness and rotational stability of the system. This design prevents a decrease in filtration efficiency due to air leakage and also reduces wear on the rotating joint 61 and bearings caused by dust.

[0032] Please refer to Figure 3 In some embodiments, the bottom of the hopper 5 is provided with a drain outlet 51.

[0033] As described above, the bottom of the chamber 5 is equipped with a drain port 51, which allows deposited dust and condensate to be easily discharged without disassembling the entire filter element structure. Users can periodically open the drain port 51 to discharge the dust, greatly improving maintenance convenience and reducing downtime.

[0034] Please refer to Figure 5 and Figure 6 In some embodiments, the number of filter blades 3 is greater than or equal to two, and the plurality of filter blades 3 are arranged circumferentially along the hollow axis 2, and the plurality of filter blades 3 are arranged integrally or separately.

[0035] As described above, the number of filter blades 3 is set to two or more, and they are evenly distributed around the hollow shaft 2, which makes the force more balanced during airflow impact and the rotation more stable. At the same time, multiple blades can significantly increase the effective filtration area, thereby improving filtration efficiency and dust holding capacity. The blades can be integrated or split to meet the needs of different working conditions: the integrated structure is easy to install and ensures strength, while the split structure facilitates the replacement of filter media.

[0036] In some embodiments, the filter blade 3 is detachably connected to the hollow shaft 2.

[0037] As described above, the filter blades 3 are detachably connected to the hollow shaft 2, allowing users to quickly replace the filter media when it becomes saturated or damaged, thus reducing maintenance costs. Furthermore, the detachable design enables the replacement of filter media with different pore sizes or materials under different operating conditions, enhancing adaptability.

[0038] In some embodiments, the plurality of filter blades 3 are arranged in a spiral or a polygonal star shape.

[0039] As described above, the filter blades 3 are arranged in a spiral or polygonal star shape along the hollow axis 2, which helps to increase the turbulence effect, strengthen the impact of the airflow on the blades, and thus enhance the self-driven rotation effect. At the same time, the polygonal star arrangement can significantly increase the effective filtration area, ensure uniform airflow distribution, avoid excessive load on one side, and improve rotational balance and filtration effect.

[0040] One embodiment of this utility model is as follows: Please refer to Figures 1 to 4 A self-cleaning rotary filter element, the filter element comprising: A cylindrical outer shell 1, which is a sealed cylindrical cavity, preferably made of metal or engineering plastic, is used to house the rotating components of the filter element. An air inlet 11 is provided tangentially on the side wall of the cylindrical outer shell 1. This air inlet 11 has a relatively large diameter, for example, 50 mm, for introducing dust-laden gas at high flow rates. An air outlet 12 is provided axially at the top center of the cylindrical outer shell 1. This air outlet 12 has a smaller diameter, for example, 25 mm, creating a diameter contrast with the air inlet 11, which enhances the driving force and increases the effective filtration area.

[0041] The hollow shaft 2 is aligned with the axis of the cylindrical outer shell 1 and is rotatably connected to the outer shell via a bearing assembly (a sealed bearing can be used for this rotatable connection), thus ensuring that the hollow shaft 2 can rotate at high speed under the action of airflow. The hollow shaft 2 can be made of stainless steel or aluminum alloy, and its shaft wall has several circumferentially distributed air holes 4, such as through holes with a diameter of 2 mm. These air holes 4 serve as inlets for purified gas to enter the shaft channel, with their hollow ends connected to the air outlet 12, ensuring that filtered air can be collected and discharged.

[0042] Filter blade 3, please refer to Figure 5 and Figure 6 The filter blades 3 are detachably connected to the hollow shaft 2 and completely cover the air pores 4. The filter blades 3 are preferably made of polypropylene (PP) or PTFE membrane filter media with a pore size of 5μm, capable of filtering dust particles in the air while possessing strong moisture resistance and corrosion resistance. The number of filter blades 3 is greater than or equal to two, preferably six, arranged circumferentially along the hollow shaft 2. The blades can be arranged in a spiral pattern, i.e., the blades are arranged at a certain spiral angle relative to the axis, which enhances the self-driving effect when impacted by airflow; or they can be arranged in a polygonal star pattern, such as a hexagonal star evenly distributed, which increases the filtration area and improves rotational balance. At least part of the filter blades 3 are located on the air intake path of the air inlet 11 so that the incoming airflow directly impacts the blades, thereby driving the hollow shaft 2 to rotate, forming a centrifugal self-cleaning effect.

[0043] The chamber 5 is assembled and connected to the end of the cylindrical outer shell 1 away from the air outlet 12, and communicates with the interior of the outer shell. The shape of the chamber 5 can be barrel-shaped or conical, with the lower end having a larger diameter than the upper end to facilitate the settling of dust and condensate. The bottom of the chamber 5 is provided with a drain port 51, such as a screw plug or a quick-opening valve, which can easily clean and discharge the sediment to prevent accumulation.

[0044] A support 6, installed inside the chamber 5 and engaging with the steps inside the chamber 5, supports the tail end of the hollow shaft 2. The support 6 includes a cone 62 and a rotating joint 61. The cone 62 is fixedly engaged with the chamber 5 to ensure rigid support. One end of the rotating joint 61 is rotatably connected to the top of the cone 62, and the other end is rotatably connected to the tail end of the hollow shaft 2, thus providing stable positioning while ensuring rotational freedom. The cone 62 has pores 4 penetrating its conical surface, allowing airflow to flow further through the cone 62, avoiding dead zones, and carrying dust down to the chamber 5. A filter layer 63 is provided outside the pores 4 of the cone 62. This filter layer 63 abuts against the side of the cone 62 facing the cylindrical outer shell 1, completely covering the pores 4, thereby performing secondary filtration of the passing airflow and preventing fine dust from entering the support 6 and bearing area.

[0045] The sealing ring 7 is located between the tail end of the cone 62 and the inner wall of the chamber 5. It serves to seal the air and prevent unfiltered gas from bypassing the filter unit and entering the exhaust channel. It also prevents dust from entering the area of ​​the rotating joint 61, thereby improving the airtightness and durability of the system.

[0046] In this embodiment, the dust-laden airflow is injected at high speed through the tangential inlet 11, impacting the filter blades 3 and driving the hollow shaft 2 to rotate. During rotation, dust is intercepted by the filter material on the surface of the filter blades 3, while the dust adhering to the filter material is thrown towards the inner wall of the outer shell by centrifugal force, eventually settling at the bottom of the chamber 5 and being discharged through the drain port 51. The purified gas passes through the filter material into the air holes 4 of the hollow shaft 2, collects in the channel of the hollow shaft 2, and is finally discharged through the top outlet 12. Due to the large diameter of the inlet 11 and the small diameter of the outlet 12, an effect of airflow acceleration and enhanced driving force is achieved, improving rotation efficiency and filtration efficiency, while extending the service life of the filter blades 3.

[0047] Meanwhile, when the filter element is in long-term operation, as dust gradually accumulates on the surface of the filter blades 3, a monitoring system is installed to monitor the airflow pressure drop in real time. When the pressure drop is detected to continuously rise to a preset threshold (indicating that the filter material is approaching or has reached its dust-holding limit), the system will issue an alarm to remind the user to perform maintenance. The user only needs to open the top cover of the cylindrical outer shell 1 and hold the hollow shaft 2 to lift the entire dynamic rotating unit assembly from top to bottom. This design fully considers modularity and convenience, allowing users to choose different maintenance strategies according to actual conditions: on the one hand, the entire rotating unit can be replaced directly, thereby restoring system operation in the shortest possible time; on the other hand, only the low-cost filter material installed on the blades can be replaced, similar to replacing a vacuum cleaner filter bag, achieving the economy and sustainable use of consumables. The above maintenance methods not only significantly reduce the workload and risk of contact with contaminants during maintenance operations, but also improve the availability of the equipment and the user experience.

[0048] This invention's self-cleaning rotary filter element design has broad application prospects. Firstly, in the field of industrial dust monitoring, such as in flue gas emission monitoring systems in power plants, cement plants, and mines, this filter element can serve as a front-end pretreatment unit, effectively reducing the impact of high-concentration dust on downstream monitoring sensors and ensuring the accuracy and continuity of monitoring data. Secondly, in the automotive testing field, this filter element can be used for detecting particulate matter in engine intake air. Through efficient filtration and self-cleaning functions, it ensures the reliability of experimental data and extends the lifespan of testing equipment. Furthermore, in medical and laboratory environments, for scenarios requiring sterile and dust-free air sampling, this invention can provide a continuous and stable clean air source, avoiding the interruption problems caused by frequent clogging of traditional filter elements. Furthermore, in the agricultural field, such as in the factory cultivation of Ganoderma lucidum, spores (each spore is only 4-6 micrometers in size) are ejected during the later stages of Ganoderma lucidum growth, and the relative humidity of the air needs to be above 80%. In this high-dust and high-humidity environment, this filter can effectively remove spores from the air, ensuring the reliable operation of the environmental detection sensors. Finally, in household fresh air systems, this filter can be used as a high-efficiency pre-filtration unit, not only improving indoor air quality but also significantly extending the service life of the main filter and reducing long-term maintenance costs. In summary, the filter described in this utility model has the advantages of high-efficiency filtration, automatic cleaning, and easy maintenance, and can meet the actual needs of multiple fields and scenarios, possessing extremely high application value and promotion potential.

[0049] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A self-cleaning rotary filter element, characterized in that, include: A cylindrical outer shell includes an air inlet disposed along the tangential direction of the cylindrical outer shell and an air outlet disposed along the axial direction of the cylindrical outer shell. The hollow shaft is aligned with the axis of the cylindrical outer shell and rotatably connected to the cylindrical outer shell; the hollow shaft is provided with air holes evenly distributed along the circumference of the shaft body, and the open end of the hollow shaft is connected to the air outlet; The filter blades are connected to the hollow shaft and completely cover the air pores; the filter blades are used to filter dust in the air. The filter blades are at least partially located in the air intake path of the air inlet, so that the incoming airflow can drive the hollow shaft to rotate when it impacts the filter blades.

2. The self-cleaning rotary filter element according to claim 1, characterized in that, It also includes a chamber, which is assembled and connected to the end of the cylindrical outer shell away from the air outlet and communicates with the cylindrical outer shell.

3. A self-cleaning rotary filter element according to claim 2, characterized in that, It also includes a support, which comprises a rotating joint and a cone; The cone is engaged with the chamber; one end of the rotary joint is rotatably connected to the top of the cone, and the other end is rotatably connected to the end of the hollow shaft away from the air outlet.

4. A self-cleaning rotary filter element according to claim 3, characterized in that, The cone is provided with air holes along the conical surface.

5. A self-cleaning rotary filter element according to claim 4, characterized in that, The support also includes a filter layer that abuts against the side of the cone facing the cylindrical outer shell and completely covers the pores located on the cone.

6. A self-cleaning rotary filter element according to claim 3, characterized in that, It also includes sealing rings, which abut against the tail end of the cone and the inner wall of the chamber, respectively.

7. A self-cleaning rotary filter element according to claim 2, characterized in that, The bottom of the silo is equipped with a sewage outlet.

8. A self-cleaning rotary filter element according to claim 1, characterized in that, The number of filter blades is greater than or equal to two, and the multiple filter blades are arranged circumferentially along the hollow axis. The multiple filter blades are either integrated or separate.

9. A self-cleaning rotary filter element according to claim 2, characterized in that, The filter blades are detachably connected to the hollow shaft.

10. A self-cleaning rotary filter element according to claim 2, characterized in that, The multiple filter blades are arranged in a spiral or a polygonal star shape.

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