A baghouse filter

Abstract

The utility model provides a kind of bag type dust removal filter, including ventilation box, filter box and multiple filter bag assemblies, ventilation box bottom is equipped with vent, filter box bottom end is equipped with dust cleaning port, filter bag assembly both ends are open, vent and dust cleaning port are communicated, each filter bag assembly is configured with helical flow guide assembly, including threaded rod, rotating rod and the helical blade of adhering filter bag inner wall, form spiral airflow passage to make dust evenly distributed, threaded rod is connected with the closure plate for plugging vent by screw thread, it is linked with closure assembly by slide bar, drives latter telescopic to seal filter bag assembly.The utility model distributes uniform by spiral channel forced airflow, improves filtering efficiency and filter bag utilization, plugging plate and closure assembly linkage realize single group isolation, support online dust cleaning and replacement, guarantee continuous operation.

Description

Technical Field

[0001] This utility model relates to the field of bag filter technology, specifically to a bag filter. Background Technology

[0002] A baghouse dust collector is a highly efficient and widely used dry gas-solid separation device. Its core filter element is a filter bag made of fiber fabric (such as polyester, aramid, PPS, etc.). Its working principle is as follows: dust-laden gas enters the dust collector housing under negative or positive pressure provided by a fan, flowing through the filter bags inside. As the airflow passes through the filter bags, dust particles are captured on the inner surface (or outer surface, depending on the air inlet method) of the filter bags through a combination of sieving, inertial collision, interception, diffusion effects, and electrostatic attraction. The purified gas then passes through the filter bags into the clean air chamber and is finally discharged through the exhaust pipe. Baghouse dust collectors are widely used in environmental pollution control and material recovery processes in many industrial sectors, including thermal power generation, cement, steel, chemical, non-ferrous metal smelting, and building materials, due to their high collection efficiency, excellent treatment effect on fine dust, stable and reliable operation, and wide range of air volume handling capabilities.

[0003] Although baghouse dust collection technology is mature, in practical applications, especially in traditional or relatively simple designs, there are still some key shortcomings that urgently need improvement. These mainly manifest in filtration efficiency, bag utilization, and operational continuity: Many existing dust collector designs fail to ensure a uniform and stable flow field when dust-laden airflow enters the filter bag filtration zone. This results in some areas of the filter bags (usually the areas closest to the inlet and directly impacted by the airflow path) experiencing significantly higher than average filtration loads (high-frequency areas). The dust layer on the surface of these filter bags thickens rapidly, leading to a sharp increase in filtration resistance. Premature deep blockages (compaction or caking) may occur in some areas, causing filtration efficiency to decrease due to channel closure and increasing the difficulty of cleaning. Conversely, filter bags in other areas (usually corners, areas far from the airflow inlet, or areas covered by non-mainstream paths) are relatively "idle" (low-frequency areas). These filter bags do not effectively share the filtration load, and their large theoretical filtration area is not fully utilized. This uneven overall airflow distribution directly results in a substantial waste of the equipment's overall effective filtration area, preventing the filtration efficiency from reaching its optimal state. The filter bag lifespan is shortened unevenly due to the uneven internal load (filter bags in the high-frequency zone are prone to failure or damage), ultimately leading to increased system operating resistance, limited overall processing capacity, and decreased operational economy.

[0004] In most traditional baghouse dust collectors, performing critical maintenance operations, such as removing dust accumulated on the inner or outer surfaces of filter bags and replacing filter bags that have reached the end of their lifespan or are damaged, typically requires a temporary shutdown of the equipment. This means cutting off the dust-laden airflow to be treated, i.e., stopping the production process or process steps. For modern large-scale industrial production processes that must operate continuously 24 hours a day, such downtime maintenance not only means direct loss of production capacity and wasted labor hours, but may also disrupt the tightly linked production process chain, leading to coordination difficulties, high restart costs, and other problems. This seriously undermines the operational continuity, stability, and reliability of the entire air pollution control system, failing to meet the requirements of modern industry for equipment availability and minimal maintenance. The lack or inadequacy of online maintenance capabilities in existing designs has become one of the bottlenecks restricting their application in critical continuous production scenarios.

[0005] In summary, existing baghouse dust collectors have significant structural deficiencies in achieving uniform airflow distribution to maximize filter bag filtration efficiency and ensuring operational continuity (especially for online maintenance). These deficiencies reduce the overall filtration efficiency and economy of the equipment, limiting its application potential in continuous production scenarios. Technical improvements addressing these issues are urgently needed and have broad application value. Utility Model Content

[0006] The purpose of this utility model is to provide a bag filter that uses a spiral channel to force airflow to be evenly distributed, thereby improving filtration efficiency and filter bag utilization. The sealing plate and the sealing component work together to achieve single-unit isolation, supporting online cleaning and replacement, and ensuring continuous operation.

[0007] To achieve the above objectives, the present invention proposes the following technical solution:

[0008] A bag filter includes a ventilation box, a filter box, and multiple filter bag assemblies. The ventilation box is detachably connected to the top of the filter box, and its bottom end has ventilation openings corresponding to the number of filter bag assemblies. The ventilation box is provided with sealing plates corresponding to the ventilation openings, and the bottom end of the filter box has dust removal ports corresponding to the number of filter bag assemblies.

[0009] Multiple filter bag assemblies are arranged side by side inside the filter box and are detachably connected to the filter box. The top and bottom of each filter bag assembly are open structures, with the top communicating with the ventilation port and the bottom communicating with the dust removal port.

[0010] Each of the filter bag assemblies is provided with a spiral flow guiding component, the spiral flow guiding component comprising:

[0011] A threaded rod, the top end of which extends to the outside of the top of the ventilation box, and the bottom end extends to the ventilation opening and is threadedly connected to the sealing plate;

[0012] A rotating rod is fixedly connected to the bottom end of the threaded rod and extends to the dust removal port;

[0013] The spiral blades are connected to the surface of the rotating rod, and their outer edges are in contact with the inner wall of the filter bag assembly, forming a spiral channel between them and the inner wall of the filter bag assembly.

[0014] Each filter bag assembly is fitted with a sealing component on its exterior. The top end of the sealing component is sealed to the top end of the filter box, and its bottom end is connected to the sealing plate via a sliding rod, allowing it to extend and retract relative to the top end.

[0015] As a preferred embodiment of the present invention, the sealing component includes a fixed sleeve and a movable sleeve arranged coaxially;

[0016] The top end of the fixed sleeve is sealed to the top end of the filter box, and the bottom inner ring is slidably fitted with the movable sleeve.

[0017] The bottom end of the movable sleeve is provided with a flange, which abuts against the outer periphery of the dust removal port when it moves downward;

[0018] The top end of the slide rod passes through the top end of the ventilation box and connects to the sealing plate, while the bottom end connects to the top end of the movable sleeve.

[0019] As a preferred technical solution of this utility model, the filter bag assembly includes a top support ring, a bottom support ring and a filter bag body. The top and bottom ends of the filter bag are both open structures, and the top and bottom ends are respectively connected to the top support ring and the bottom support ring.

[0020] The top support ring abuts against the inner side of the top of the filter box and surrounds the vent; the bottom support ring is snapped onto the outer side wall of the bottom of the filter box and surrounds the dust removal port.

[0021] As a preferred technical solution of this utility model, at least two sets of positioning plates are provided on the outer periphery of the dust removal port, and the positioning plates and the bottom wall of the filter box form a U-shaped groove.

[0022] The edge of the bottom support ring is provided with a locking plate that engages with the slot.

[0023] The bottom support ring is also equipped with two sets of handles at its bottom end.

[0024] As a preferred embodiment of the present invention, a flared portion is provided between the top support ring and the vent, and the inner diameter of the flared portion gradually decreases along the airflow direction.

[0025] As a preferred technical solution of this utility model, it also includes a fixing component, which includes a first fixing ring, a second fixing ring and a movable ring, all of which have notched structures. The second ring is snapped onto the bottom support ring, and the first fixing ring is sleeved on the upper outer side of the filter bag body. Multiple sets of support rods are connected between the two, and the top of the support rods passes through the first fixing ring.

[0026] The movable frame ring is engaged with the top support ring, and a tensioning component is provided between it and the first fixed frame ring for adjusting the axial tension of the filter bag body.

[0027] As a preferred embodiment of the present invention, the tensioning assembly includes a slide tube, a support block, a threaded block, and a tensioning screw.

[0028] The bottom end of the sliding tube is movably sleeved on the top end of the supporting upright, and the top end is connected to the movable frame ring;

[0029] The support block and the threaded block are respectively disposed on the side wall of the movable frame ring and the side wall of the first fixed frame ring. The top end of the tensioning screw is rotatably connected to the support block, and its lower end is threadedly connected to the threaded block.

[0030] As a preferred technical solution of this utility model, each of the dust removal ports is provided with a dust storage box on the outside, and an end cover is detachably connected to its bottom end. The end cover is provided with a dust discharge pipe.

[0031] As a preferred embodiment of this utility model, the spiral flow guiding component further includes:

[0032] A support base is provided at the top of the ventilation box for rotatably supporting the threaded rod;

[0033] A turntable is connected to the top of the threaded rod;

[0034] The guide cover, with its outer diameter gradually decreasing from top to bottom, is fixed to the bottom end of the rotating rod.

[0035] As a preferred embodiment of this utility model, the filter box is provided with a support frame on the outside.

[0036] As can be seen from the above technical solutions, the present invention provides a bag filter that has the following significant advantages compared with the prior art:

[0037] 1. Improved airflow uniformity: Each filter bag assembly is equipped with a spiral guide component containing spiral blades, which forces the dust-laden airflow to flow along the spiral channel, so that the dust comes into uniform contact with the inner wall of the filter bag, avoiding local overload or idleness, and improving the overall filtration efficiency and filter bag utilization rate.

[0038] 2. Online maintenance and continuous operation: When the threaded rod of the spiral guide assembly rotates, it synchronously drives the sealing plate to move down and seal the ventilation port. At the same time, the sliding rod drives the movable sleeve of the sealing assembly to extend down to the dust removal port, forming an independent sealed cavity. When dust removal or replacement is required, only a single filter bag assembly needs to be isolated and operated, without stopping the machine to ensure continuous system operation.

[0039] 3. Modular quick disassembly: The filter bag assembly achieves quick positioning and sealing through the Imperial non-support ring and bottom support ring. With the bottom handle, it supports independent replacement, improving maintenance efficiency by more than 50%.

[0040] 4. Optimized dust removal efficiency: When the spiral blades rotate, they scrape off the dust from the inner wall of the filter bag. Through the spiral channel, combined with the axial tensioning component, dust caking is avoided, reducing dust removal energy consumption.

[0041] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0042] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0043] The accompanying drawings are not drawn to scale according to a true reference numeral. In the drawings, each identical or nearly identical component shown in the various figures can be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0044] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0045] Figure 2 This is a first sectional view of the structure of the filter box and ventilation box of this utility model;

[0046] Figure 3 This is a second sectional view of the structure of the filter box and ventilation box of this utility model;

[0047] Figure 4 This is a bottom view of the end cap and the internal structure of the dust collection box of this utility model;

[0048] Figure 5 This is a cross-sectional view of the overall structure of this utility model;

[0049] Figure 6These are multi-angle schematic diagrams of the spiral flow guide assembly, lifting assembly, and movable sleeve structure of this utility model.

[0050] Figure 7 These are multi-angle schematic diagrams of the filter bag assembly and fixing bracket structure of this utility model;

[0051] Figure 8 This utility model Figure 5 Enlarged view of A in the middle;

[0052] Figure 9 This utility model Figure 5 A magnified view of B in the middle.

[0053] The meanings of the reference numerals in the attached figures are as follows:

[0054] 10. Filter box; 11. Air outlet duct; 12. Support frame; 13. Flared end; 14. Air inlet duct; 15. Ventilation box; 16. End cap; 17. Control valve; 18. Sewage pipe; 19. Dust collection box; 110. Clamping plate; 111. Positioning plate; 112. Handle; 113. First sealing ring; 114. Second sealing ring; 115. Turntable; 116. Guide cover;

[0055] 20. Sealing component; 21. Fixed sleeve; 22. Movable sleeve; 23. Fourth sealing ring;

[0056] 30. Filter bag assembly; 31. Top support ring; 32. Bottom support ring; 33. Filter bag body;

[0057] 40. Fixed bracket; 41. First fixed bracket ring; 42. Second fixed bracket ring; 43. Movable bracket ring; 44. Supporting upright; 45. Tensioning assembly; 451. Sliding tube; 452. Support block; 453. Tensioning screw; 46. First locking rod; 47. Second locking rod;

[0058] 50. Spiral guide assembly; 51. Support base; 52. Threaded rod; 53. Rotating rod; 54. Spiral blade;

[0059] 60. Lifting assembly; 61. Sealing plate; 62. Slide rod; 63. Third sealing ring. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0061] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0062] To address the significant structural deficiencies in existing baghouse dust collectors regarding achieving uniform airflow distribution to maximize filter bag filtration efficiency and ensuring operational continuity (especially for online maintenance), this invention provides a baghouse dust filter.

[0063] Please see Figures 1-9 The bag filter of this utility model includes: a filter box 10, a ventilation box 15, a dust storage box 19, multiple filter bag assemblies 30, a sealing assembly 20, a fixing assembly 40, a spiral flow guiding assembly 50, and a lifting assembly 60.

[0064] The ventilation box 15 is detachably connected to the top of the filter box 10. Its side wall has an air inlet pipe 14 connecting the inside and outside, and its bottom has ventilation openings corresponding to the number of filter bag assemblies 30, connecting the ventilation box 15 and the filter box 10. The filter box 10 has an air outlet pipe 11 connecting its interior to its side wall, and its bottom has dust removal ports corresponding to the number of filter bag assemblies 30. To collect the dust discharged from the dust removal ports, a dust collection box 19 is also provided on the bottom side wall of the filter box 10, with a number corresponding to the number of dust removal ports. An end cover 16 is detachably connected to the bottom of the dust collection box 19, and a dust discharge pipe 18 is provided on the end cover 16. A control valve 17 is provided on the dust discharge pipe 18.

[0065] In the actual assembly of the bag filter of this utility model, the assembly of the ventilation box 15 and the filter box 10, as well as the assembly of the dust collection box 19 and the end cover 16, can be achieved by using commonly used lifting eye, nut, screw, buckle and clamping accessories in the prior art, or by directly using nuts and bolts to achieve detachable connection. The dust collection box 19 can be connected to the bottom outer wall of the filter box 10 by welding. The air inlet pipe 14 can be connected to external equipment that needs to filter dust-laden gas through a flange, and the air outlet pipe 11 can be connected to external equipment that receives purified air through a flange. The control valve 17 can be a manual valve or solenoid valve that can discharge dust in the prior art.

[0066] The outer ring of the filter box 10 is welded with a support frame 12, which includes a semi-circular first frame with a notch, multiple support legs and several annular second frames. The first frame and the several second frames are coaxially arranged. The first frame is welded to the outer wall of the filter box 10, the multiple second frames are located below the first frame, and the support legs are welded between the first frame and the second frames to form a stable support structure. This structure can provide a stable bottom support for the filter and raise the filter to a certain height to facilitate subsequent cleaning and replacement of internal components by the staff.

[0067] like Figure 2-3 As shown, multiple filter bag assemblies 30 are arranged side by side inside the filter box, including a top support ring 31, a bottom support ring 32, and a filter bag body 33. The top and bottom ends of the filter bag body 33 are open structures, serving as air inlets and dust outlets. These two ends are connected to the top support ring 31 and the bottom support ring 32, respectively. The support rings expand the filter bag body 33 into a cylindrical shape, thereby enclosing a circular channel filtration area inside. The dust-laden airflow is filtered here, and the dust is isolated inside the filter bag body 33, while the purified gas penetrates the side wall of the filter bag body 33 and is discharged to the area between the filter chamber and the sealing assembly.

[0068] The top support ring 31 and the bottom support ring 32 can be made of high-strength plastic materials, etc. The filter bag body 33 adopts a common cloth bag used for filtering dust, and its mesh number can be selected from conventional existing pore size specifications according to actual process conditions.

[0069] To facilitate the disassembly and maintenance of the filter bag assembly 33, both the top support ring 31 and the bottom support ring 32 are detachably connected to the filter box 10. Furthermore, to guide the gas flow within the ventilation box 15 and prevent direct airflow impact on the filter bag assembly 30, a flared portion 13 is provided between the top of the filter bag body 33 and the ventilation opening. The top of the flared portion 13 is welded to the inner wall of the top of the filter box 10 and surrounds the ventilation opening. Its inner diameter gradually narrows along the airflow direction, and a second sealing ring 114 is provided on the inner ring of its bottom end. The inner diameter of the top support ring 31 is slightly smaller than the inner diameter of the bottom end of the flared portion 13, allowing it to be inserted into the bottom end of the flared portion and form an interference seal with the second sealing ring 114. This achieves a detachable connection between the upper end of the filter bag body 33 and the filter box 10, while maintaining reliable sealing.

[0070] Each dust removal port is provided with at least two sets of positioning plates 111 on its periphery. The positioning plates 111 have an L-shaped cross-section, which forms a U-shaped groove with the outer wall of the bottom end of the filter box 10. The outer diameter of the bottom support ring 32 is slightly larger than the diameter of the dust removal port, so as to abut against the outer wall of the bottom end of the filter box 10 and prevent the top support ring 31 from being over-inserted into the flared part, thus playing a limiting role. The side wall of the bottom support ring 32 is integrally formed with a locking plate 110 corresponding to the number of grooves. The bottom end of the filter bag body 33 is detachably connected to the bottom end of the filter box 10 by the locking plate 110 engaging with the groove. In addition, in order to facilitate carrying and disassembling the filter bag assembly 33, a set of handles 112 is also provided on the bottom support ring 32.

[0071] In order to keep the filter bag assembly 30 taut and improve the actual filtration efficiency and accuracy of the component, a fixing component 40 is provided to stably support the axial direction of the filter bag assembly 30 and adjust the axial tension of the filter bag body 33 to keep it taut.

[0072] Furthermore, such as Figure 7 As shown, the fixing assembly 40 includes a first fixing ring 41 with a notch, a second fixing ring 42, and a set of movable rings 43. The second ring 42 is engaged with the bottom support ring 32, the first fixing ring 41 is sleeved on the upper outer side of the filter bag body 33, and multiple sets of support rods 44 are connected between the two. The top end of the support rod 44 passes through the first fixing ring 41. The movable rings 43 are engaged with the top support ring 31, and a tensioning assembly 45 is provided between them and the first fixing ring 41.

[0073] In some specific embodiments of this utility model, the bottom support ring 32 is provided with multiple second locking holes, which correspond to the bottom end of the support rod 44. The bottom surface of the second fixing ring 42 is connected to multiple sets of second locking rods 47, and the position of the second locking rods 47 also corresponds to the bottom end of the support rod 44. The second locking rods 47 pass through the second locking holes of the bottom support ring 32 and the bottom surface of the second fixing ring 42 in sequence and connect to the support rod 44, thereby connecting the bottom support ring 32, the second fixing ring 42, and the support rod 44 together. Similarly, the top support ring 31 is provided with multiple first locking holes, which correspond to the top end of the slide tube 451. The top surface of the movable frame ring 43 is connected to multiple sets of first locking rods 46, and the position of the first locking rods 46 also corresponds to the top end of the slide tube 451. The first locking rods 46 pass through the top support ring 31 and the movable frame ring 43 in sequence and connect to the slide tube 451, thereby connecting the top support ring 31, the movable frame ring 43, and the slide tube 451 together. To further enhance connection stability, the surfaces of the first and second clamps can be provided with external threads, and the first and second clamp holes are threaded holes. The bottom end of the support rod 44 and the top end of the slide tube 451 are also provided with corresponding internal threaded holes. The bottom and top ends of the fixing component 40 are connected to the bottom and top ends of the filter bag body 33 respectively through threaded connection to form axial support.

[0074] The tensioning assembly 45 includes several sliding tubes 451, support blocks 452, threaded blocks, and tensioning screws 453. The number of sliding tubes 451 is the same as the number of support rods 44, and their bottom ends are fitted onto the top ends of the support rods 44 to form a telescopic rod assembly with a telescopic effect. The support blocks 452 are integrally formed and connected to the side wall of the movable frame ring 43, while the threaded blocks are correspondingly connected to the side wall of the first fixed frame ring 41. The centers of the two coincide along the axial projection of the filter bag body 33. The top end of the tensioning screw 453 is rotatably connected to the support block 452, and its bottom end passes through the threaded block and is threadedly connected to it. In this way, by rotating the tensioning screw 453, the support block 452 can be moved upward relative to the threaded block, thereby causing the top support ring 31 to move upward and tighten the filter bag body 33.

[0075] When the filter bag assembly 30 is assembled with the fixing assembly 40, the former is fed into its inner ring through the notches of the first fixing ring 41, the second fixing ring 42, and a set of movable rings 43. The bottom support ring 32 is connected to the support rod 44 of the second fixing ring 42 via the second locking rod 47, and the top support ring 31 is connected to the slide tube 451 of the movable ring 43 via the first locking rod. When the operator rotates the tension screw 453, the tension screw 453 can drive the movable ring 43 and its connected support block 452 relative to the first fixing frame. As ring 41 moves upward, movable frame ring 43 drives slide tube 451 to slide upward at the top of support rod 44. Slide tube 451 improves the stability of movable frame ring 43's vertical movement. The upward-moving movable frame ring 43 can drive the top support ring 31 to move relative to the bottom support ring 32 through the first locking rod 46, adjusting the distance between the top support ring 31 and the bottom support ring 32, thereby tightening the filter bag body 33 inside the fixing assembly 40. The tightened filter bag body 33 is easy to fit onto the outer ring of the spiral flow guiding assembly 50 for use. The filter bag assembly 30 and fixing assembly 40 of this utility model are easy to assemble and disassemble, facilitating the replacement of the filter bag assembly 30 when damaged, reducing the cost of using the filter.

[0076] When the filter bag assembly 30 is installed inside the filter box 10, it can be inserted from the bottom up through the dust removal port and fitted onto the outside of the spiral flow guide assembly 50. By rotating the filter bag assembly 30 and its connected fixing component 40, the clamping plate 110 can be rotated and clamped into the slot to realize the quick installation and removal of the filter bag assembly 30, which is conducive to the subsequent maintenance and replacement of the filter bag assembly 30. The handle 112 is provided for easy carrying or rotation of the filter bag assembly 30 and its connected fixing component 40.

[0077] To enhance the sealing between the periphery of the dust removal port and the bottom support ring 32, a first sealing ring 113 is provided between the top of the card plate 110 and the outer wall of the bottom of the filter box 10.

[0078] To enable online replacement of the filter bag assembly 30 and ensure uniform distribution of the dust-laden airflow passing through it, each filter bag assembly 30 in this embodiment of the present invention is equipped with a sealing assembly 20, a lifting assembly 60, and a spiral guide assembly 50. The lifting assembly 60 connects the sealing assembly and the spiral guide assembly 50, enabling them to work together. By controlling the spiral guide assembly 50, the filter bag body 33 can be cleaned simultaneously, and the current filter bag assembly 30 can be isolated from the internal space of the filter box 10 for online maintenance and replacement of the assembly.

[0079] The sealing assembly 20 includes a fixed sleeve 21 and a movable sleeve 22 coaxially disposed outside the filter bag assembly 30. The top end of the fixed sleeve 21 is fixedly connected to the inner side wall of the top end of the filter box 10 and surrounds the flared portion 13; its bottom inner ring is slidably fitted with the movable sleeve 22, and the inner side wall of the bottom inner ring is also provided with an inner flange protruding towards the axis. The top and bottom ends of the movable sleeve 22 are respectively provided with an upper flange and a lower flange, wherein the bottom surfaces of the upper flange and the lower flange are both bonded with a fourth sealing ring 23. When the movable sleeve 22 moves downward relative to the fixed sleeve 21, the bottom surface of the upper flange abuts against the top surface of the inner flange and forms a seal through the fourth sealing ring 23; at the same time, the lower flange abuts against the bottom end of the filter box 10 and forms a seal through the fourth sealing ring 23.

[0080] The lifting assembly 60 includes a sealing plate 61, several sliding rods 62, and a third sealing ring 63. The sealing plates 61 are located inside the ventilation box 15, their number corresponding to the number of ventilation openings. The center of each sealing plate 61 coincides with the center of its corresponding ventilation opening. Because the flared section 13 is installed below the ventilation opening, the center of the sealing plate 61 also falls on the central axis of the flared section 13. To facilitate the connection of the flared section 13 to the ventilation opening, its top end is provided with an outward-facing flange. The third sealing ring 63 is located on the top surface of the outward-facing flange of the flared section, used to seal the ventilation opening when the sealing plate 61 presses against the upper end of the flared section, ensuring the sealing performance of the sealing plate 61 and preventing dust-laden airflow from entering the filter bag assembly 30 below the flared section 13. As shown in the figure, four sets of sliding rods 62 are detachably connected between the sealing plate 61 and the sealing assembly 20. The top of each slide rod 62 passes sequentially through the top of the filter box 10, the outer flange, and the third sealing ring 63, and is connected to the sealing plate 61; its bottom end extends axially to the upper flange of the movable sleeve 22 and is connected to it. Thus, the sealing plate 61 and the movable sleeve 22 are connected together, so that the two are linked.

[0081] The spiral guide assembly 50 includes a support base 51, a threaded rod 52, a rotating rod 53, and spiral blades 54. The support base 51 has built-in bearings and seals to achieve a sealed rotational connection with the threaded rod 52. This can be compared with the rotational connection structure of a manual valve in the prior art, which is existing technology and will not be described in detail here.

[0082] The threaded rod 52 and the rotating rod 53 are coaxially arranged inside the filter bag body, and their central axes coincide with the central axis of the filter bag body 33. Specifically:

[0083] The top end of the threaded rod 52 extends through the top end of the ventilation box 15 and the support base 51, and is connected to a turntable 115. This allows the operator to easily rotate the turntable 115 from the top of the device, thereby rotating the threaded rod 52 and its connecting structure. The turntable 115 can also be replaced by existing structures such as motors, which can be used to achieve full automation of the equipment.

[0084] The bottom end of the threaded rod 52 extends to the dust removal port and is fixedly connected to the rotating rod 53. The sealing plate 61 is threadedly connected to the threaded rod 52, and rotating the threaded rod 52 allows the sealing plate 61 to move closer to or further away from the dust removal port. Specifically, when rotating the threaded rod 52 to rotate the spiral blades 54 for dust removal, the threaded rod 52 can cause the sealing plate 61 on its surface to move downwards, blocking the corresponding ventilation opening. Simultaneously, the sealing plate 61, through the sliding rod 62, causes the movable sleeve 22 to move downwards, extending from the lower end of the fixed sleeve 21 until the lower flange covers the dust removal port, thereby independently sealing and enclosing the filter bag assembly 30 to which it belongs. This allows the lifting assembly 60 to provide a certain sealing space for the filter bag assembly 30 during dust removal, facilitating subsequent individual sewage discharge or component replacement.

[0085] The top end of the rotating rod 53 is fixedly connected to the bottom end of the threaded rod 52, and a spiral blade 54 is welded to its surface to fit against the inner wall of the filter bag body 33. The spiral blade 54 can form a certain spiral airflow channel with the inner wall of the filter bag body 33, which facilitates more uniform contact between the dust-laden gas to be filtered and the filter bag body 33, and also facilitates the downward transportation of the separated dust from the gas from the spiral airflow channel to the dust collection box 19. Rotating the threaded rod 52 can drive the rotating rod 53 and the spiral blade 54 to rotate. The spiral blade 54, which fits against the inner surface of the filter bag body 33, can scrape the dust attached to it downwards, which is convenient for the daily dust cleaning operation of the filter bag body 33.

[0086] The bottom end of the rotating rod 53 extends to the dust removal port and even into the dust collection box 19; in order to facilitate the quick installation of the filter bag assembly 30 from the bottom end of the spiral guide assembly 50, a guide cover 116 with a gradually decreasing outer diameter from top to bottom is also welded on.

[0087] In actual use, the dust-laden gas to be purified is transported to the ventilation box 15 through the air inlet pipe 14. The dust-laden gas in the inner cavity of the ventilation box 15 enters the filter bag assembly 30 through the ventilation port, is filtered, and then transported to the inner cavity of the filter box 10. The gas is then transported to subsequent equipment through the air outlet pipe 11.

[0088] When the dust-laden gas that needs to be filtered passes through the inner ring of the filter bag assembly 30, the spiral guide assembly 50 that fits the inner wall of the filter bag assembly 30 allows the dust-laden gas to flow along the spiral channel formed between the spiral guide assembly 50 and the filter bag assembly 30. This facilitates the gas to pass evenly through the side of the filter bag assembly 30 into the filter box 10, thereby improving the uniformity of the overall actual filtration of the filter bag assembly 30 and making it easier to guide the filtered dust to the dust storage box 19 below for storage.

[0089] In addition, the present invention also provides a fixing component 40 for tightening the filter bag assembly 30. The tightened filter bag assembly 30 can further improve the actual filtration efficiency and accuracy of the component. The flared part 13 provided at the top of the filter bag assembly 30 facilitates the flow of gas in the ventilation box 15, and at the same time, the flared part 13 also helps to prevent the airflow from directly impacting the filter bag assembly 30.

[0090] When dust removal is required after a certain period of use, the operator rotates a set of spiral guide components 50. The rotating spiral guide components 50 can scrape the dust adhering to the inner wall of the filter bag assembly 30 downwards into the dust collection box 19. The rotating spiral guide components 50 can also drive the sealing plate 61 to move downwards, and the sealing plate 61 drives the movable sleeve 22 to move downwards until its lower flange abuts against the bottom wall of the filter box 10. This provides a certain sealed space for the filter bag assembly 30 inside the filter box 10, and the corresponding control at the bottom of the current filter bag assembly 30 is activated. Dust accumulated inside valve 17 and dust collection box 19, as well as dust scraped off by spiral guide assembly 50, can be transported to the outside of the equipment through dust discharge pipe 18. End cover 16 can also be opened to replace filter bag assembly 30. After the operation is completed, spiral guide assembly 50 can be rotated to reset lifting assembly 60. All filter bag assemblies 30 can be cleaned or replaced one by one by operating in sequence. Cleaning or replacing one set of filter bag assemblies 30 will not affect the normal use of other filter bag assemblies 30, which can ensure that the normal operation of the filtration system is not affected during routine maintenance of the filter.

[0091] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A bag filter, characterized in that, It includes a ventilation box (15), a filter box (10) and multiple filter bag assemblies (30). The ventilation box (15) is detachably connected to the top of the filter box (10). Its bottom end has ventilation openings corresponding to the number of filter bag assemblies (30). The ventilation box (15) is provided with a sealing plate (61) corresponding to the ventilation opening. The bottom end of the filter box (10) has a dust removal port corresponding to the number of filter bag assemblies (30). Multiple filter bag assemblies (30) are arranged side by side inside the filter box (10) and are detachably connected to the filter box (10). The top and bottom of each filter bag assembly (30) are open structures, and its top is connected to the ventilation port and its bottom is connected to the dust removal port. Each of the filter bag assemblies (30) is provided with a spiral flow guiding assembly (50), the spiral flow guiding assembly (50) comprising: A threaded rod (52) extends at its top end to the outside of the top end of the ventilation box (15) and at its bottom end to the ventilation opening and is threadedly connected to the sealing plate (61). The rotating rod (53) is fixedly connected to the bottom end of the threaded rod (52) and extends to the dust removal port; The spiral blade (54) is connected to the surface of the rotating rod (53), and its outer edge is in contact with the inner wall of the filter bag assembly (30), forming a spiral channel between the blade and the inner wall of the filter bag assembly (30). Each filter bag assembly (30) is fitted with a sealing assembly (20) on its exterior. The top end of the sealing assembly (20) is sealed to the top end of the filter box (10), and its bottom end is connected to the sealing plate (61) via a slide rod (62), and can extend and retract relative to the top end.

2. The bag filter according to claim 1, characterized in that, The enclosure assembly (20) includes a fixed sleeve (21) and a movable sleeve (22) arranged coaxially. The top end of the fixed sleeve (21) is sealed to the top end of the filter box (10), and the bottom inner ring is slidably sleeved with the movable sleeve (22). The bottom end of the movable sleeve (22) is provided with a flange, which abuts against the outer periphery of the dust removal port when it moves down; The top end of the slide bar (62) passes through the top end of the ventilation box (15) and is connected to the sealing plate (61), while the bottom end is connected to the top end of the movable sleeve (22).

3. The bag filter according to claim 1, characterized in that, The filter bag assembly (30) includes a top support ring (31), a bottom support ring (32) and a filter bag body (33). The top and bottom ends of the filter bag body (33) are open structures, and the top and bottom ends are respectively connected to the top support ring (31) and the bottom support ring (32). The top support ring (31) abuts against the inner side of the top of the filter box (10) and surrounds the vent; the bottom support ring (32) is engaged with the outer side wall of the bottom end of the filter box (10) and surrounds the dust removal port.

4. The bag filter according to claim 3, characterized in that, At least two sets of positioning plates (111) are provided on the outer periphery of the dust removal port, and the positioning plates (111) and the bottom wall of the filter box (10) form a U-shaped groove. The bottom support ring (32) has a card plate (110) on its edge that engages with the card slot. The bottom support ring (32) is also provided with two sets of handles (112) at its bottom end.

5. The bag filter according to claim 3, characterized in that, A flared section (13) is provided between the top support ring (31) and the vent, and the inner diameter of the flared section (13) gradually decreases along the airflow direction.

6. The bag filter according to claim 3, characterized in that, It also includes a fixing component (40), which includes a first fixing ring (41), a second fixing ring (42) and a movable ring (43), all of which have a notch structure. The second fixing ring (42) is snapped onto the bottom support ring (32). The first fixing ring (41) is sleeved on the upper outer side of the filter bag body (33). Multiple sets of support rods (44) are connected between the two, and the top of the support rods (44) passes through the first fixing ring (41). The movable frame ring (43) is engaged with the top support ring (31), and a tensioning component (45) is provided between it and the first fixed frame ring (41) to adjust the axial tension of the filter bag body (33).

7. The bag filter according to claim 6, characterized in that, The tensioning assembly (45) includes a slide tube (451), a support block (452), a threaded block, and a tensioning screw (453). The bottom end of the slide tube (451) is movably sleeved on the top end of the support pole (44), and the top end is connected to the movable frame ring (43). The support block (452) and the threaded block are respectively provided on the side wall of the movable frame ring (43) and the side wall of the first fixed frame ring (41). The top end of the tensioning screw (453) is rotatably connected to the support block (452), and its lower end is threadedly connected to the threaded block.

8. The bag filter according to claim 1, characterized in that, Each of the dust removal ports is provided with a dust collection box (19) on the outside, and an end cap (16) is detachably connected to its bottom end. The end cap (16) is provided with a dust discharge pipe (18).

9. The bag filter according to claim 1, characterized in that, The spiral guide assembly (50) further includes: A support base (51) is provided at the top of the ventilation box (15) for rotatably supporting the threaded rod (52). A turntable (115) is connected to the top of the threaded rod (52); The guide cover (116) has an outer diameter that gradually decreases from top to bottom and is fixed to the bottom end of the rotating rod (53).

10. The bag filter according to claim 1, characterized in that, The filter box (10) is provided with a support frame (12) on the outside.

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