A self-cleaning filter

Abstract

The utility model belongs to the technical field of filter, and relates to a self-cleaning filter, including filter box, the both sides of filter box are provided with feed inlet and discharge gate respectively, be provided with filter cavity in filter box, be provided with the filter unit of axial in filter cavity, the filter unit includes filter drum, filter screen, baffle and scraper, the scraper is sleeved on the scraper shaft of power device drive rotation and is connected through the spline, the axial one side of filter box is provided with the cover that can open and close, the inner wall of filter cavity is conical, its cross section area increases towards the cover direction, the outer wall contour of filter unit is adapted to filter cavity, the filter unit is pressed tightly and seals filter cavity when the cover is closed, the filter unit can be taken out from filter cavity after the cover is opened. The self-cleaning filter provided by the utility model can realize the quick, simple and convenient disassembly of filter unit and scraper shaft.

Description

Technical Field

[0001] This utility model belongs to the technical field of filters and relates to a self-cleaning filter. Background Technology

[0002] In polymer granulation, to ensure that the material is granulated smoothly and in a standardized manner, the molten polymer needs to be strictly filtered before passing through the template holes. Depending on the grade of the material, the required filter screen is also different. Currently, material filtration is generally carried out by a filter.

[0003] In the prior art, such as Chinese patent CN222788565U, a "four-channel self-cleaning filter" is disclosed. It works by arranging two filter units in parallel along the axis, with each unit forming a dual-channel flow, thus creating a total of four channels. This is intended to improve the filtration capacity of a single device to meet the needs of high-volume production lines.

[0004] However, such existing filters have a significant drawback: the disassembly process is extremely cumbersome when the filter unit requires deep cleaning, filter screen replacement, scraper shaft replacement, or major overhaul. It typically requires partial or complete disassembly of the entire device, or laborious removal of the tightly fitted filter unit axially. This not only results in long maintenance times and significant downtime losses, but also demands high skill levels from operators, increasing maintenance costs and inconvenience.

[0005] Therefore, there is an urgent need in this field for a self-cleaning filter that can achieve quick assembly and disassembly of the filter unit and facilitate maintenance while maintaining a highly efficient self-cleaning function. Utility Model Content

[0006] This invention addresses the shortcomings of existing technologies by providing a self-cleaning filter that enables quick and easy assembly and disassembly of the filter unit and scraper shaft, thereby significantly reducing maintenance time, difficulty, and cost.

[0007] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution: A self-cleaning filter includes a filter housing with an inlet and an outlet on both sides. A filter chamber is provided inside the filter housing, and an axial filter unit is provided inside the filter chamber. The filter unit includes a filter cylinder, a filter screen, a support plate, a partition, and a scraper. The scraper is mounted on a scraper shaft driven to rotate by a power device and connected to it via a spline. An openable cover is provided on one axial side of the filter housing. The inner wall of the filter chamber is conical, and its cross-sectional area increases towards the cover plate. The outer wall contour of the filter unit is adapted to the filter chamber. When the cover plate is closed, it presses the filter unit and seals the filter chamber. When the cover plate is opened, the filter unit can be removed from the filter chamber.

[0008] In the aforementioned self-cleaning filter, the power unit includes a motor and a gearbox. The gearbox has a through hole coaxial with the scraper shaft. During assembly, the scraper shaft is inserted into the through hole synchronously along with the filter unit. During disassembly, the through hole forms an ejection channel for ejecting the scraper shaft and the filter unit.

[0009] In the aforementioned self-cleaning filter, the output shaft of the gearbox is a hollow shaft, the inner hole of the hollow shaft forms the through hole, and the scraper shaft is connected to the output shaft via a spline.

[0010] In the aforementioned self-cleaning filter, multiple filter units are provided and sequentially mounted on a scraper shaft, with all scrapers corresponding to the filter units being driven by the scraper shaft. Furthermore, each filter unit includes a filter cylinder, a pair of filter screens, a pair of support plates, a pair of partitions, and a pair of scrapers. The support plates may be perforated plates. Preferably, adjacent filter units share a partition.

[0011] In the aforementioned self-cleaning filter, the bottom of the filter cylinder of the filter unit is provided with a discharge port, which is connected to the same discharge device through a downward-converging discharge channel; the discharge device adopts a conventional device in the art, such as a motor-driven screw or a cylinder-driven piston rod to transport the impurities out of the device.

[0012] In the aforementioned self-cleaning filter, the partition plate is provided with a discharge channel communicating with the discharge port. The discharge channel includes multiple radial channels and an annular channel. The annular channel is arranged around the outer periphery of the radial channels and communicates with them. The annular channel is connected to the discharge port through an opening.

[0013] In the aforementioned self-cleaning filter, the cover plate and the filter housing are positioned and sealed by an annular concave-convex structure; for example, an annular protrusion is provided at the adjacent position between the filter housing and the inner wall of the filter chamber, and an annular groove is provided on the end face of the cover plate to cooperate with the annular protrusion.

[0014] In the aforementioned self-cleaning filter, a rocker arm for driving the opening and closing of the cover is provided on the top of the filter housing; the rocker arm can be a hydraulic rocker arm or a pneumatic rocker arm.

[0015] In the aforementioned self-cleaning filter, a water-cooled jacket is fitted over the scraper shaft to cool it; preferably, the water-cooled jacket is located on the outer side of the filter housing.

[0016] Compared with the prior art, this utility model has the following advantages: 1. This utility model provides a self-cleaning filter with a conical design for its filter chamber and filter unit, coupled with a cover plate that can press the filter unit together. This simplifies the structure and allows for quick removal and installation of the scraper shaft and filter unit. During maintenance, only the cover plate needs to be opened to remove the core components as a whole. Compared to the complex disassembly process required in existing technologies, maintenance efficiency is increased several times, significantly reducing downtime. Furthermore, this utility model features a through hole in the gearbox, which, combined with the aforementioned conical structure, allows for easier and faster ejection of the scraper shaft and filter unit for repair and replacement.

[0017] 2. This invention further improves the flow channel characteristics of the filter by adopting a combination of radial and annular flow channels, which makes the flow of filtered material smoother, reduces dead angles in the flow channel, and ensures the uniformity of filtration. Due to the use of a smoother and more efficient flow channel, the flow channel depth of this invention can be significantly reduced, thereby allowing the use of baffles with smaller axial dimensions and reducing the overall volume of the filter.

[0018] 3. This utility model further optimizes the impurity removal device. By guiding the impurity removal ports of multiple filter cartridges to the same impurity removal device, the number of impurity removal devices required for multi-channel filters is reduced, thereby simplifying the structure and saving costs. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is an axial sectional view of the present invention; Figure 3 This is an exploded view of this utility model; Figure 4 This is an exploded view of the filter unit of this utility model; Figure 5 This is a cross-sectional view of the filter housing and filter unit of this utility model; Figure 6 This is a perspective view of the partition of this utility model; Figure 7 This is a perspective view of another filter housing of this utility model; Reference numerals in the attached drawings: 1. Filter housing; 11. Inlet; 12. Outlet; 13. Cover plate; 14. Impurity discharge channel; 15. Concave-convex structure; 21. Filter cylinder; 22. Filter screen; 23. Support plate; 24. Partition plate; 25. Scraper; 26. Scraper shaft; 27. Impurity discharge port; 28. Radial flow channel; 29. ​​Annular flow channel; 31. Motor; 32. Gearbox; 33. Through hole; 4. Impurity discharge device; 5. Rocker arm; 6. Water cooling jacket. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-7 : A self-cleaning filter includes a filter housing 1, with an inlet 11 and an outlet 12 respectively provided on both sides of the filter housing 1. A filter chamber is provided inside the filter housing 1, and an axial filter unit is provided inside the filter chamber. The filter unit includes a filter cylinder 21, a filter screen 22, a support plate 23, a partition plate 24, and a scraper 25. The scraper 25 is mounted on a scraper shaft 26 driven to rotate by a power device and is connected to it via a spline. An openable cover plate 13 is provided on one axial side of the filter housing 1. The inner wall of the filter chamber is conical, and its cross-sectional area increases towards the cover plate 13. The outer wall contour of the filter unit is adapted to the filter chamber. When the cover plate 13 is closed, it presses the filter unit and seals the filter chamber. When the cover plate 13 is opened, the filter unit can be removed from the filter chamber.

[0021] When the scraper shaft 26 and filter unit need to be repaired or replaced, first open the cover plate 13. After the cover plate 13 is opened, its clamping force is released, and the entire filter unit and scraper shaft 26 can slide smoothly out of the filter chamber along the conical guide surface. The installation process is the reverse of the above process. Push the assembled filter unit and scraper shaft 26 into place along the conical cavity, then close the cover plate 13 and tighten the filter unit.

[0022] Comparison Appendix Figure 1 To be continued Figure 3 The aforementioned power unit includes a motor 31 and a reduction gearbox 32. The reduction gearbox 32 has a through hole 33 coaxial with the scraper shaft 26. During assembly, the scraper shaft 26 is inserted into the through hole 33 simultaneously with the installation of the filter unit. During disassembly, the through hole 33 forms an ejection channel for pushing out the scraper shaft 26 and the filter unit. Furthermore, the output shaft of the reduction gearbox 32 is a hollow shaft, and the inner hole of the hollow shaft forms the through hole 33. The scraper shaft 26 is connected to the output shaft via a spline. One end of the scraper shaft 26 is connected to the scraper 24 via a spline, and the other end is inserted into the through hole 33 formed by the hollow output shaft of the reduction gearbox 32 during assembly. During insertion, the scraper shaft 26 and the output shaft form a transmission connection structure with internal and external splines. When disassembly is required, simply insert a push rod or use other ejection devices from the other end of the through hole 33 to eject the scraper shaft 26 along with the entire filter unit, achieving an integrated "drive-ejection" function.

[0023] Comparison Appendix Figure 4 and attached Figure 5To improve filtration capacity, multiple filter units are provided and sequentially mounted on the scraper shaft 26. All scrapers 24 corresponding to each filter unit are driven by the scraper shaft 26. Furthermore, each filter unit includes a filter cylinder 21, a pair of filter screens 22, a pair of support plates 23, a pair of partitions 24, and a pair of scrapers 25. Preferably, adjacent filter units share a partition 24. In this embodiment, the attached drawings show a filter with a four-channel dual-filter unit. The scrapers 25 can be ordinary scrapers 25 or dedicated plastic filter self-cleaning scrapers 25 (Chinese Utility Model CN219681865U).

[0024] Furthermore, the filter cylinder 21 of the aforementioned filter unit has a discharge port 27 at its bottom, which is connected to the same discharge device 4 via a downwardly converging discharge channel 14. The discharge device 4 employs conventional devices in the art, such as a screw driven by a motor 31 or a piston rod driven by a cylinder to transport the impurities out of the device. Impurities scraped off by all units are collected through the discharge ports 27 at the bottom of their respective filter cylinders 21 into a general downwardly sloping discharge channel 14, and are finally discharged uniformly by the same discharge device 4 (such as a screw extruder).

[0025] Comparison Appendix Figure 6 Furthermore, the aforementioned partition 24 is provided with a discharge channel communicating with the discharge port 12. The discharge channel includes multiple radial channels 28 and an annular channel 29. The annular channel 29 is arranged around the outer periphery of the radial channels 28 and communicates with them. The annular channel 29 is connected to the discharge port 12 through an opening. After the filtered clean fluid passes through the filter screen 22 and the support plate 23, it first enters the multiple radial channels 28, then merges into an annular channel 29, and finally flows into the discharge port 12 of the filter housing 1 through the opening of the annular channel 29. This "radial-annular" channel layout adopted in this embodiment has a channel cross-sectional area that gradually increases from the inside to the outside. This design ensures that the filtered material can flow out smoothly and without obstruction, effectively avoiding the formation of flow dead zones, thereby achieving a highly efficient and uniform filtration effect.

[0026] Furthermore, the cover plate 13 and the filter housing 1 are positioned and sealed by an annular convex-concave structure 15; for example, an annular protrusion is provided at the adjacent position between the filter housing 1 and the inner wall of the filter chamber, and an annular groove is provided on the end face of the cover plate 13 to cooperate with the annular protrusion. To facilitate opening the cover plate 13, a rocker arm 5 for driving the opening and closing of the cover plate 13 is provided on the top of the filter housing 1; the rocker arm 5 can be a hydraulic rocker arm 5 or a pneumatic rocker arm 5. The above-mentioned convex-concave sealing structure and mechanical opening mechanism ensure the sealing reliability and operational safety of the equipment during long-term operation.

[0027] Furthermore, a water-cooling jacket 6 is fitted around the scraper shaft 26 to cool it; preferably, the water-cooling jacket 6 is located near the outer side of the filter housing 1. This embodiment, through its unique "water-cooling jacket 6" design, solves the industry problem of scraper shaft 26 deformation and seal failure caused by high-temperature materials, thus expanding the application range of this filter.

[0028] In this embodiment, the shape of the filter housing 1 is not limited, and it can be square (see attached image). Figure 1 (as shown), or it can be cylindrical (see attached). Figure 7 (As shown).

[0029] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A self-cleaning filter, comprising a filter housing (1), wherein an inlet (11) and an outlet (12) are respectively provided on both sides of the filter housing (1), and a filter chamber is provided inside the filter housing (1), characterized in that, An axial filter unit is provided inside the filter chamber. The filter unit includes a filter cylinder (21), a filter screen (22), a support plate (23), a partition plate (24), and a scraper (25). The scraper (25) is mounted on a scraper shaft (26) driven by a power device and connected to it via a spline. An openable cover plate (13) is provided on one axial side of the filter box (1). The inner wall of the filter chamber is conical, and its cross-sectional area increases toward the cover plate (13). The outer wall contour of the filter unit is adapted to the filter chamber. When the cover plate (13) is closed, it presses the filter unit and seals the filter chamber. When the cover plate (13) is opened, the filter unit can be removed from the filter chamber.

2. A self-cleaning filter according to claim 1, characterized in that, The power unit includes a motor (31) and a gearbox (32). The gearbox (32) has a through hole (33) coaxial with the scraper shaft (26). During assembly, the scraper shaft (26) is inserted into the through hole (33) along with the filter unit. During disassembly, the through hole (33) forms an ejection channel for ejecting the scraper shaft (26) and the filter unit.

3. A self-cleaning filter according to claim 2, characterized in that, The output shaft of the gearbox (32) is a hollow shaft, and the inner hole of the hollow shaft forms the through hole (33). The scraper shaft (26) is connected to the output shaft by a spline.

4. A self-cleaning filter according to claim 1, characterized in that, The filter unit is provided in multiple ways and is sequentially mounted on the scraper shaft (26). All the scrapers (25) corresponding to the filter unit are driven by the scraper shaft (26).

5. A self-cleaning filter according to claim 4, characterized in that, The filter cylinder (21) of the filter unit has a discharge port (27) at the bottom, and the discharge port (27) is connected to the same discharge device (4) through the downward-converging discharge channel (14).

6. A self-cleaning filter according to claim 4, characterized in that, The partition (24) is provided with a discharge channel that communicates with the discharge port (12). The discharge channel includes multiple radial channels (28) and an annular channel (29). The annular channel (29) is arranged around the outer periphery of the radial channels (28) and communicates with them. The annular channel (29) is connected to the discharge port (12) through an opening.

7. A self-cleaning filter according to claim 6, characterized in that, Adjacent filter units share a partition (24).

8. A self-cleaning filter according to claim 1, characterized in that, The cover plate (13) and the filter housing (1) are positioned and sealed by an annular concave-convex structure (15).

9. A self-cleaning filter according to claim 1, characterized in that, The top of the filter housing (1) is provided with a rocker arm (5) for opening and closing the drive cover plate (13).

10. A self-cleaning filter according to claim 1, characterized in that, The scraper shaft (26) is fitted with a water-cooling jacket (6) to cool the scraper shaft (26).

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