Dust removal filter bag with high-efficiency sealing structure
By using a staggered double elastic ring design and a folded-over-the-mouth design to wrap the tube sheet through the holes, the problem of simple sealing structure and leakage in existing filter bags is solved, resulting in a dust collector filter bag with high efficiency and strong adaptability.
Patent Information
- Application Number
- CN202610981868.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-02
- Publication Date
- 2026-08-25
AI Technical Summary
Existing dust collector filter bags are prone to leakage at the notch of the spring ring, and the sealing structure is simple and unreliable, resulting in decreased filtration efficiency and increased risk of leakage.
It adopts a double elastic ring structure with staggered notches to form an annular installation space. The bag opening is folded over to wrap around the tube sheet through hole, achieving a composite wrapping seal on the upper, radial and lower surfaces. It is clamped by a tensioning unit to adapt to different tube sheet thicknesses.
It effectively eliminates the risk of leakage from gaps, improves sealing reliability and filtration efficiency, is easy and quick to install, and is adaptable to different tube sheet thicknesses.
Smart Images
Figure CN122624969A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of dust removal, specifically to a dust removal filter bag with a highly efficient sealing structure. Background Technology
[0002] Dust collector filter bags are the core component of baghouse dust collectors, widely used in flue gas dust control in industries such as coal-fired boilers, cement kilns, waste incineration, and metallurgy. The bag opening of the dust collector filter bag is typically installed at a through-hole in the tube sheet. Multiple through-holes are arrayed on the tube sheet, with one dust collector filter bag installed in each through-hole. One existing filter bag installation method involves a notched spring ring at the top of the filter bag. During installation, the top of the filter bag with the spring ring is inserted into the through-hole of the tube sheet. The radial force generated by the expansion of the spring ring presses the top of the filter bag tightly against the wall of the through-hole, achieving a tight seal.
[0003] However, the aforementioned existing technologies have the following problems in practical applications: 1. Leakage is prone to occur at the notch of the spring coil: The spring coil must have a notch to achieve its elastic expansion and contraction capability, but this notch creates a sealing break in the circumferential direction. Dust-laden gas can bypass the sealing surface and directly enter the clean air chamber through the notch of the spring coil, leading to a decrease in filtration efficiency and affecting emission compliance. Even if the spring coil presses the filter bag tightly against the wall of the tube sheet's through-holes, the notch location still poses an unavoidable leakage hazard.
[0004] 2. The existing sealing structure is too simple and lacks reliability: Current technology relies solely on the radial contact surface between the outer top of the filter bag and the wall of the tube sheet's through-holes to achieve a seal, resulting in a single circumferential surface. During dust collector operation, the dust-laden airflow enters the filter bag from bottom to top. The combined negative pressure of the system and the airflow pressure create an upward thrust on the top of the filter bag. This thrust is perpendicular to the radial clamping force of the spring coil. Over long-term use, micro-gaps easily appear between the top of the filter bag and the wall of the tube sheet's through-holes, gradually breaking the seal. Furthermore, if the tube sheet's through-hole walls have rust, burrs, or out-of-roundness deviations, the sealing continuity of the radial contact surface will be further reduced, exacerbating the risk of leakage. Summary of the Invention
[0005] Purpose of the invention: This application aims to overcome the deficiencies of the prior art and provide a dust collector filter bag with a highly efficient sealing structure.
[0006] Technical solution: A dust collector filter bag includes a bag body and an elastic mounting unit. The top of the bag body is folded outward and the bag opening is fixedly connected to the outer wall of the bag body, thereby forming an annular mounting space for mounting the elastic mounting unit. The elastic mounting unit includes a first elastic ring, a second elastic ring, and a plurality of tensioning units connecting the first elastic ring and the second elastic ring. The first elastic ring includes a first abutting plate and a first clamping plate connected to the first abutting plate. The second elastic ring includes a second abutting plate and a second clamping plate connected to the second abutting plate. The first abutting plate, the first clamping plate, the second abutting plate, and the second clamping plate are all annular with notches. The tensioning unit includes a first pull rope connected to the first abutting plate, a second pull rope connected to the second abutting plate, and an elastic ring connecting the first pull rope and the second pull rope.
[0007] Furthermore, the first elastic ring and the second elastic ring are annular with notches.
[0008] Furthermore, the outer diameter of the first clamping plate is larger than the outer diameter of the first abutting plate.
[0009] Furthermore, the outer diameter of the second clamping plate is larger than the outer diameter of the second abutting plate.
[0010] Furthermore, both the first and second pull ropes are braided metal wire ropes.
[0011] In some embodiments, both the first and second pull ropes are PTFE fiber braided ropes.
[0012] Furthermore, the first clamping plate is used to abut against the upper surface of the pattern plate through the bag body, and the second clamping plate is used to abut against the lower surface of the pattern plate through the bag body; the first abutting plate is used to abut against the inner wall of the through hole of the pattern plate through the bag body, and the second abutting plate is used to abut against the inner wall of the through hole of the pattern plate through the bag body.
[0013] Furthermore, the bag body includes an inner annular pleated portion and an outer annular pleated portion, and the tensioning unit is located between the inner annular pleated portion and the outer annular pleated portion.
[0014] Furthermore, the first abutment plate has a plurality of first through holes, the second abutment plate has a plurality of second through holes, a first pull rope passes through the first through holes and is connected to the first abutment plate, and a second pull rope passes through the second through holes and is connected to the second abutment plate.
[0015] In some embodiments, a first pull rope passes through a first hole and is secured by tying, and a second pull rope passes through a second hole and is secured by tying.
[0016] In some embodiments, a first pull rope passes through a first through hole and its end is welded to itself; a second pull rope passes through a second through hole and its end is welded to itself.
[0017] Furthermore, the elastic ring has a third through hole and a fourth through hole, the first pull rope passes through the third through hole and the end of the first pull rope is fixed with a first limiting block, the second pull rope passes through the fourth through hole and the end of the second pull rope is fixed with a second limiting block.
[0018] Thus, the first and second limit blocks can abut against the elastic ring. Therefore, after the filter bag is installed, the elastic ring can tighten the first and second pull ropes.
[0019] Furthermore, a support block is installed inside the elastic ring, and a connecting block is fixedly connected to the support block. A connecting rope is connected between the connecting block and the inner annular pleated portion.
[0020] By manually pulling the inner annular pleated part, the connecting block can be pulled through the connecting rope, thereby causing the support block to disengage from the elastic ring, and the elastic ring can then be reset.
[0021] Furthermore, the connecting rope is a metal wire braided rope, a glass fiber rope, or a PTFE fiber rope.
[0022] Furthermore, the support block is made of rubber or stainless steel.
[0023] Furthermore, when there is no external force, the elastic ring is elliptical.
[0024] Furthermore, the support block has a top groove at its top end and a bottom groove at its bottom end.
[0025] Thus, the first limiting block can be located in the top groove, and the second limiting block can be located in the bottom groove.
[0026] Furthermore, the notch in the first elastic ring and the notch in the second elastic ring are located at the furthest points from each other.
[0027] Therefore, the installation positions of the first and second elastic rings can complement each other, avoiding leakage at the gap.
[0028] Furthermore, the number of the flexible mounting units is greater than or equal to four.
[0029] Furthermore, the bag opening is sewn or heat-pressed to the outer wall of the bag body.
[0030] Furthermore, the bag body is made of needle-punched felt made of polyphenylene sulfide fiber, polytetrafluoroethylene fiber or polyimide fiber.
[0031] Furthermore, the first elastic ring, the second elastic ring, and the elastic ring are all made of stainless steel.
[0032] Beneficial effects: Compared with the prior art, this solution has the following beneficial effects, 1. Complementary notches in dual elastic rings eliminate the risk of leakage: By offsetting the notches of the first and second elastic rings circumferentially, preferably by 180 degrees, the two notches are kept far apart. The notch of the first elastic ring is sealed by the complete segment of the second elastic ring from the other side of the tube sheet, and vice versa, thus structurally eliminating a direct leakage path. Even if dust-laden gas attempts to pass through the notch of one elastic ring, it will be blocked by the complete segment of the other elastic ring, preventing it from directly entering the clean air chamber. This fundamentally solves the problem of easy leakage at the notch of traditional single spring rings.
[0033] 2. The bag opening is folded over to wrap the tube sheet, forming a composite wrapping seal: After the top of the filter bag is folded over, an annular installation space is formed. The folded bag opening completely wraps the upper surface, hole wall and lower surface of the tube sheet through hole, upgrading the traditional single radial contact seal to a composite wrapping seal that includes upper surface seal, radial seal and lower surface seal.
[0034] 3. Easy and quick installation, with strong adaptability to tube sheet thickness: During installation, the support block expands the elastic ring, placing the first and second clamping plates at a relatively large distance, making it easier to place the elastic installation unit in the corresponding position of the tube sheet through hole. After the filter bag is in place, by pulling the inner annular pleats, the support block is pulled out of the elastic ring via the connecting rope. The elastic ring retracts and resets, automatically clamping the first and second clamping plates to the tube sheet, completing the installation. Furthermore, the extension and retraction stroke of the elastic ring provides a certain adjustment range for the clamping plates, thus adapting to tube sheets of different thicknesses. Attached Figure Description
[0035] Figure 1 This is a schematic diagram of a dust collector filter bag; Figure 2 This is a magnified view of region A; Figure 3 This is a schematic diagram of the interior of the annular installation space; Figure 4 This is a magnified view of region B. Figure 5 This is a schematic diagram of the flexible installation unit before installation. Figure 6 This is a schematic diagram of the flexible installation unit after installation. Detailed Implementation
[0036] Reference numerals in the attached drawings: 1.1 First clamping plate; 1.2 First abutting plate; 1.3 First pull rope; 1.4 First limiting block; 2.1 Second clamping block; 2.2 Second abutment plate; 2.3 Second pull rope; 2.4 Second limit stop block; 3. Elastic ring; 4.1 Support block; 4.2 Connecting block; 4.3 Connecting rope; 5. Bag body; 5.1 Inner ring-shaped pleated part; 5.2 Outer ring-shaped pleated part.
[0037] like Figure 1-6 As shown, a dust collector filter bag with a high-efficiency sealing structure includes a bag body 5 and an elastic mounting unit. The top of the bag body 5 is folded outward, and the bag opening is fixedly connected to the outer wall of the bag body 5, thereby forming an annular mounting space for mounting the elastic mounting unit. The elastic mounting unit includes a first elastic ring, a second elastic ring, and multiple tensioning units connecting the first elastic ring and the second elastic ring. The first elastic ring includes a first abutting plate 1.2 and a first clamping plate 1.1 connected to the first abutting plate 1.2. The second elastic ring includes a second abutting plate 2.2 and a second clamping plate 2.1 connected to the second abutting plate 2.2. The first abutting plate 1.2, the first clamping plate 1.1, the second abutting plate 2.2, and the second clamping plate 2.1 are all annular with notches. The tensioning unit includes a first pull rope 1.3 connected to the first abutting plate 1.2, a second pull rope 2.3 connected to the second abutting plate 2.2, and an elastic ring 3 connecting the first pull rope 1.3 and the second pull rope 2.3. The first elastic ring and the second elastic ring are annular with notches. The bag body 2 includes an inner annular pleated portion 5.1 and an outer annular pleated portion 5.2, and the tensioning unit is located between the inner annular pleated portion 5.1 and the outer annular pleated portion 5.2. The first abutment plate 1.2 has multiple first through holes, and the second abutment plate 2.2 has multiple second through holes. A first pull rope 1.3 passes through the first through holes and is connected to the first abutment plate 1.2, and a second pull rope 2.3 passes through the second through holes and is connected to the second abutment plate 2.2. The elastic ring 3 has a third through hole and a fourth through hole. The first pull rope 1.3 passes through the third through hole, and a first limiting block 1.4 is fixed to the end of the first pull rope 1.3. The second pull rope 2.3 passes through the fourth through hole, and a second limiting block 2.4 is fixed to the end of the second pull rope 2.3. A support block 4.1 is installed inside the elastic ring 3, and a connecting block 4.2 is fixedly connected to the support block 4.1. A connecting rope 4.3 connects the connecting block 4.2 and the inner annular pleated portion 5.1. When there is no external force, the elastic ring 3 is elliptical; the support block 4.1 has a top groove and a bottom groove. The notches of the first elastic ring and the second elastic ring are located at their furthest points from each other. The number of elastic mounting units is greater than or equal to four. The bag opening is sewn or heat-pressed to the outer wall of the bag body; the bag body 5 is made of needle-punched felt made of polyphenylene sulfide fiber, polytetrafluoroethylene fiber, or polyimide fiber. The first elastic ring, the second elastic ring, and the elastic ring 3 are all made of stainless steel.
[0038] The dust collector filter bag of this application has its top end folded outward to form an annular installation space. An elastic installation unit can be installed within this space. Initially, the elastic ring contains a support block, allowing the first and second clamping plates to be positioned relatively far apart. External force can reduce the notch in the second elastic ring, allowing it to be placed below the tube sheet's through-hole. This positions the first clamping plate above the tube sheet and the second clamping plate below it, with the first and second abutting plates surrounded by the tube sheet's through-hole. Pulling the inner annular folds disengages the support block from the elastic ring, resetting it. The tightening unit then tightens the first and second elastic rings, clamping the tube sheet between the first and second clamping plates and the bag body. The first and second abutting plates abut against the inner wall of the tube sheet's through-hole, achieving a tight seal. After the filter bag is installed, the cage is then installed, completing the installation of the dust collector filter bag.
[0039] Because the notches of the first and second elastic rings are positioned 180 degrees opposite each other, they complement each other. The notch of the first elastic ring is pressed and sealed from the other side of the tube sheet by the complete segment of the second elastic ring, and vice versa. This avoids leakage that can easily occur at a single notch. Furthermore, the first pressure plate, the first abutting plate, the second abutting plate, and the second pressure plate abut against and seal the tube sheet through the filter bag and the through-hole, forming a wrap-around seal, resulting in a good sealing effect.
[0040] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.
Claims
1. A dust collector filter bag with a high-efficiency sealing structure, characterized in that, The device includes a bag body and an elastic mounting unit. The top of the bag body is folded outward, and the bag opening is fixedly connected to the outer wall of the bag body, thereby forming an annular mounting space for mounting the elastic mounting unit. The elastic mounting unit includes a first elastic ring, a second elastic ring, and multiple tensioning units connecting the first elastic ring and the second elastic ring. The first elastic ring includes a first abutting plate and a first clamping plate connected to the first abutting plate. The second elastic ring includes a second abutting plate and a second clamping plate connected to the second abutting plate. The first abutting plate, the first clamping plate, the second abutting plate, and the second clamping plate are all annular with notches. The tensioning unit includes a first pull rope connected to the first abutting plate, a second pull rope connected to the second abutting plate, and an elastic ring connecting the first pull rope and the second pull rope.
2. The dust collector filter bag with a high-efficiency sealing structure according to claim 1, characterized in that, The bag body includes an inner annular pleated portion and an outer annular pleated portion, and the tensioning unit is located between the inner annular pleated portion and the outer annular pleated portion.
3. The dust collector filter bag with a high-efficiency sealing structure according to claim 1, characterized in that, The first abutment plate has multiple first through holes, and the second abutment plate has multiple second through holes. A first pull rope passes through the first through holes and is connected to the first abutment plate, and a second pull rope passes through the second through holes and is connected to the second abutment plate.
4. The dust collector filter bag with a high-efficiency sealing structure according to claim 1, characterized in that, The elastic ring has a third through hole and a fourth through hole. The first pull rope passes through the third through hole and the end of the first pull rope is fixed with a first limiting block. The second pull rope passes through the fourth through hole and the end of the second pull rope is fixed with a second limiting block.
5. The dust collector filter bag with a high-efficiency sealing structure according to claim 2, characterized in that, A support block is installed inside the elastic ring, and a connecting block is fixedly connected to the support block. A connecting rope connects the connecting block and the inner annular pleated part.
6. The dust collector filter bag with a high-efficiency sealing structure according to claim 5, characterized in that, When there is no external force, the elastic ring is elliptical; the top end of the support block has a top groove and the bottom end has a bottom groove.
7. The dust collector filter bag with a high-efficiency sealing structure according to claim 1, characterized in that, The gaps in the first elastic ring and the second elastic ring are located at the furthest points from each other.
8. The dust collector filter bag with a high-efficiency sealing structure according to claim 1, characterized in that, The number of the flexible mounting units is greater than or equal to four.
9. The dust collector filter bag with a high-efficiency sealing structure according to claim 1, characterized in that, The bag opening is sewn to the outer wall of the bag body or hot-pressed welded; the bag body is made of needle-punched felt made of polyphenylene sulfide fiber, polytetrafluoroethylene fiber or polyimide fiber.
10. The dust collector filter bag with a high-efficiency sealing structure according to claim 1, characterized in that, The first elastic ring, the second elastic ring, and the elastic ring are all made of stainless steel.