Ceramic fiber filter element sealing device with protection function

Abstract

The utility model provides a ceramic fiber filter element sealing device with a protection function, and belongs to the technical field of filter element sealing. The problems that traditional sealing of the ceramic fiber filter element has the shear fracture risk, high-temperature sealing is not reliable, and pulse dust cleaning airflow scouring damage exists are solved. The device comprises an inner sheath, an outer sheath, an outer sealing sleeve and an inner sealing sleeve, the upper ends of the inner sheath, the outer sheath, the outer sealing sleeve, the inner sealing sleeve and a filter element are all of an inverted conical structure, a positioning hole is formed in a pore plate, the lower portion of the outer sheath is inserted into the positioning hole and connected with the pore plate, the outer sealing sleeve is arranged on the inner side of the inverted conical structure of the outer sheath, and the inner sealing sleeve is connected with the pore plate. The outer wall of the inverted-cone-shaped structure at the upper end of the filter element is arranged on the inner side of the outer sealing sleeve, the inner sealing sleeve is arranged on the inner wall of the inverted-cone-shaped structure at the upper end of the filter element, the inner sheath is arranged on the inner side of the inner sealing sleeve, and the inner sheath is connected with the outer sheath. The sealing device is mainly used for sealing the ceramic fiber filter element.

Description

Technical Field

[0001] This utility model belongs to the field of filter element sealing technology, and in particular relates to a ceramic fiber filter element sealing device with protective function. Background Technology

[0002] High-temperature filters are used in fields such as high-temperature flue gas treatment, acid gas filtration, and waste incineration. In these filters, the filter element, as the core component, is crucial for ensuring filtration efficiency. Besides meeting performance specifications for filtration accuracy, a good seal between the filter element and the perforated plate is also essential. When the filter element is filtering media, dust will adhere to its outer surface. When the resistance reaches a set value, the filter element needs to be cleaned. Compressed gas is used as the cleaning source. During high-pressure pulse cleaning, the cleaning airflow should be kept away from the upper inner wall of the ceramic fiber filter element, as this can easily damage it.

[0003] The sealing method commonly used in the industry is the flange compression structure, such as... Figure 11 As shown, the lower plane of the flange contacts the upper plane of the filter element, and the lower part of the ceramic fiber filter element flange contacts the upper part of the orifice plate, forming an annular sealing surface. Bolts are welded to the orifice plate, and the bolts pass through the flange holes. The flange is fixed by nuts, and the filter element is pressed flat on the surface of the orifice plate, thereby achieving a seal on the filter element.

[0004] This traditional solution has significant drawbacks. First, while the filter element is made of high-temperature ceramic fiber, which has high tensile strength, its shear resistance is relatively weak. When the flange is directly pressed onto the upper surface of the filter element, the long-term strength decay of the filter element will cause concentrated shear stress at the pressing edge, making it very easy to break under pressure. Figure 11 The shear surface shown in the diagram forms a fracture, leading to filter element breakage and failure, significantly shortening its service life. Secondly, in existing sealing structures, the filter element is in direct contact with the perforated plate surface, resulting in poor sealing. Furthermore, conventional structures lack airflow protection mechanisms for the filter element. The upper inner wall of the filter element is unprotected; during cleaning, the cleaning airflow will wash over the upper interior of the filter element, causing damage and failure.

[0005] Therefore, there is an urgent need for a new type of sealing device that can eliminate shear stress, improve sealing reliability, and effectively protect the filter element, in order to meet the requirements of long-term stable operation of high-temperature filters. Utility Model Content

[0006] In view of this, the present invention aims to propose a ceramic fiber filter element sealing device with protective function to solve the problems of shear breakage risk, unreliable high-temperature sealing and scouring damage caused by pulse cleaning airflow in traditional ceramic fiber filter elements.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a ceramic fiber filter element sealing device with protective function, comprising an inner sheath, an outer sheath, an outer sealing sleeve, and an inner sealing sleeve. The upper ends of the inner sheath, outer sheath, outer sealing sleeve, inner sealing sleeve, and filter element are all inverted conical structures. A positioning hole is provided on the perforated plate. The lower part of the outer sheath is inserted into the positioning hole and connected to the perforated plate. An outer sealing sleeve is provided on the inner side of the inverted conical structure of the outer sheath. The outer wall of the inverted conical structure at the upper end of the filter element is provided on the inner side of the outer sealing sleeve. An inner sealing sleeve is provided on the inner wall of the inverted conical structure at the upper end of the filter element. An inner sheath is provided on the inner side of the inner sealing sleeve. The inner sheath is connected to the outer sheath.

[0008] Furthermore, a first flange structure is provided on the outer side of the upper end of the inner sheath, and a second flange structure is provided on the outer side of the upper end of the outer sheath, with the first flange structure and the second flange structure connected together.

[0009] Furthermore, the first flange structure has a through hole, and the second flange structure has a threaded hole. A bolt is inserted into the through hole and is screwed into the threaded hole.

[0010] Furthermore, the number of the first flange structure and the second flange structure is the same and there are multiple of each. The multiple first flange structures are evenly distributed along the circumference of the inner sheath, and the multiple second flange structures are evenly distributed along the circumference of the outer sheath. The positions of the first flange structure and the second flange structure correspond to each other.

[0011] Furthermore, the outer sheath has a cylindrical structure below its inverted conical structure, which is inserted into the positioning hole and connected to the perforated plate.

[0012] Furthermore, the outer sheath is connected to the perforated plate by welding.

[0013] Furthermore, both the outer and inner sealing sleeves are made of flexible material.

[0014] Furthermore, the filter element is a ceramic fiber filter element.

[0015] Furthermore, the inner sheath, outer sheath, outer sealing sleeve, and inner sealing sleeve are all inverted conical annular structures.

[0016] Furthermore, the centers of the inner sheath, outer sheath, outer sealing sleeve, inner sealing sleeve, and filter element are aligned.

[0017] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention proposes a ceramic fiber filter element sealing device with protective function, which can solve the shortcomings of conventional ceramic fiber filter element sealing devices and has the advantages of both filter element sealing performance and filter element protection, thus ensuring the filtration efficiency of high-temperature filters. This invention can eliminate the influence of shear force when the filter element's strength decreases after long-term operation, preventing ceramic fiber filter element breakage and extending the service life of the ceramic fiber filter element. Simultaneously, it improves the sealing effect between the ceramic fiber filter element and the perforated plate, thereby ensuring the long-term stability of the filter element.

[0018] The fracture of ceramic fiber shear surfaces is mainly caused by stress concentration and shear force. This invention improves the sealing structure by using a conical outlet for the filter element body. The connection between the outlet and the straight section of the filter element is subjected to tensile stress. Under the same filter element size and dust weight conditions, the ceramic fiber filter element has better tensile stress resistance, making the connection less prone to breakage. The conical outlet is constrained by inner and outer sheaths. According to force analysis, the conical surface experiences pressure from the inner and outer sheaths. The conical surface has a larger contact area than the annular surface of traditional sealing structures, thus avoiding the effects of stress concentration. Therefore, the influence of shear force on the ceramic fiber filter element is eliminated, improving its service life.

[0019] The outer sheath of this invention is welded to the orifice plate for sealing. The contact surface between the outer sheath and the outer sealing sleeve is conical. When the filter element is subjected to gravity, the contact surface tends to automatically press together, improving the sealing effect. The inner sheath of this invention has a conical structure. During dust removal, a pulsed airflow is blown in from the top of the ceramic fiber filter element. The top of the inner sheath protects the top of the ceramic fiber filter element, and the conical surface protects the inner side of the ceramic fiber filter element, thus protecting the entire upper part of the ceramic fiber filter element. Attached Figure Description

[0020] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0021] Figure 1 This is a cross-sectional view of a ceramic fiber filter element sealing device with protective function according to the present invention.

[0022] Figure 2 This is a top view of the protective ceramic fiber filter element sealing device of the present invention.

[0023] Figure 3 This is a schematic cross-sectional view of the inner sheath structure described in this utility model;

[0024] Figure 4 This is a top view of the inner sheath structure described in this utility model;

[0025] Figure 5 This is a schematic cross-sectional view of the outer sheath of the present invention;

[0026] Figure 6 This is a top view of the outer sheath structure described in this utility model;

[0027] Figure 7 This is a cross-sectional view of the outer sealing sleeve described in this utility model;

[0028] Figure 8 This is a top view of the outer sealing sleeve structure described in this utility model;

[0029] Figure 9 This is a schematic cross-sectional view of the inner sealing sleeve described in this utility model;

[0030] Figure 10 This is a top view of the inner sealing sleeve structure described in this utility model;

[0031] Figure 11 This is a schematic diagram of the conventional sealing solution for existing filter elements described in this utility model.

[0032] In the picture:

[0033] 1-Inner sheath, 2-Outer sheath, 3-Outer sealing sleeve, 4-Inner sealing sleeve, 5-Filter element, 6-Orifice plate, 7-Bolt, 8-Flange, 9-Sealing surface, 10-Shearing surface.

[0034] Figure 1 and Figure 11 The middle arrow indicates the direction of the dust removal airflow. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0036] See Figure 1-10This embodiment describes a ceramic fiber filter element sealing device with protective function, comprising an inner sheath 1, an outer sheath 2, an outer sealing sleeve 3, and an inner sealing sleeve 4. The upper ends of the inner sheath 1, outer sheath 2, outer sealing sleeve 3, inner sealing sleeve 4, and filter element 5 are all inverted conical structures. A positioning hole is provided on the perforated plate 6. The lower part of the outer sheath 2 is inserted into the positioning hole and connected to the perforated plate 6. The outer sealing sleeve 3 is disposed on the inner side of the inverted conical structure of the outer sheath 2. The outer wall of the inverted conical structure at the upper end of the filter element 5 is disposed on the inner side of the outer sealing sleeve 3. The inner sealing sleeve 4 is disposed on the inner wall of the inverted conical structure at the upper end of the filter element 5. The inner sheath 1 is disposed on the inner side of the inner sealing sleeve 4. The inner sheath 1 is connected to the outer sheath 2.

[0037] In this embodiment, a first flange structure is provided on the outer side of the upper end of the inner sleeve 1, and a second flange structure is provided on the outer side of the upper end of the outer sleeve 2. The first flange structure is connected to the second flange structure. A through hole is provided on the first flange structure, and a threaded hole is provided on the second flange structure. A bolt 7 is inserted into the through hole and screwed into the threaded hole. The number of first flange structures and second flange structures is the same, and there are multiple first flange structures. Multiple first flange structures are evenly distributed along the circumference of the inner sleeve 1, and multiple second flange structures are evenly distributed along the circumference of the outer sleeve 2. The positions of the first flange structures and the second flange structures correspond to each other.

[0038] In this embodiment, the outer sheath 2 has a cylindrical structure below its inverted conical structure, which is inserted into the positioning hole and connected to the orifice plate 6. The outer sheath 2 and the orifice plate 6 are connected by welding. The outer sealing sleeve 3 and the inner sealing sleeve 4 are both made of flexible materials, such as high-temperature resistant rubber. The filter element 5 is a ceramic fiber filter element. The inner sheath 1, outer sheath 2, outer sealing sleeve 3, and inner sealing sleeve 4 are all inverted conical annular structures. The centers of the inner sheath 1, outer sheath 2, outer sealing sleeve 3, inner sealing sleeve 4, and filter element 5 are aligned.

[0039] This embodiment discloses a ceramic fiber filter element sealing device with protective function, including an inner sheath 1, an outer sheath 2, an outer sealing sleeve 3, an inner sealing sleeve 4, and bolts 7. A positioning hole is provided on the perforated plate 6. The lower part of the outer sheath 2 has a cylindrical structure, which is inserted into the positioning hole of the perforated plate 6 and fixedly connected to the perforated plate 6 by welding. The welding of the outer sheath 2 to the perforated plate 6 ensures that their centers are aligned, thus forming a sealing base.

[0040] The upper part of the outer sheath 2 has an inverted conical annular structure, with an outer sealing sleeve 3 installed on the inner side of the cone. During assembly, the outer sealing sleeve 3 is first inserted from the top of the outer sheath 2, ensuring it fits snugly against the inner wall of the cone. The upper end of the ceramic fiber filter element 5 is designed with an inverted conical structure. It is inserted vertically into the inner side of the outer sealing sleeve 3 and slightly compressed. Because the outer sealing sleeve 3 is made of a flexible material, it deforms under pressure, thus achieving a tight seal between the outer surface of the filter element 5 and the outer sheath 2.

[0041] An inner sealing sleeve 4 is installed on the inner wall of the inverted conical structure at the upper end of the filter element 5. This inner sealing sleeve 4 is also an inverted conical annular structure made of flexible material. After pressing the inner sealing sleeve 4 into the inner wall of the filter element 5, the inner sheath 1 is then installed inside the inner sealing sleeve 4. The inner sheath 1 is an inverted conical annular structure, with a first flange structure on its upper outer side, while the outer sheath 2 has a corresponding second flange structure on its upper outer side. The first flange structure and the second flange structure are evenly distributed along their respective circumferences, with the same number and corresponding positions.

[0042] The inner sleeve 1 and the outer sleeve 2 are fixedly connected by bolts 7: Bolts 7 are inserted into the through hole of the first flange structure and screwed into the threaded hole on the second flange structure. When bolts 7 are tightened, the outer sleeve 2, the outer sealing sleeve 3, the filter element 5, the inner sealing sleeve 4, and the inner sleeve 1 form a five-layer overlapping contact surface. The axial pressure compacts each contact surface, ultimately achieving a tight axial seal of the filter element 5.

[0043] In this embodiment, the straight cylindrical part of the outer sheath 2 is welded and fixed to the perforated plate 6 to form the device foundation; the conical part cooperates with the outer sealing sleeve 3, and when the filter element 5 is subjected to gravity, the conical surface generates an automatic pressing tendency, enhancing the sealing reliability. The top plane of the inner sheath 1 covers the upper end surface of the filter element 5, and the conical side fits against the inner wall of the filter element 5. During dust removal, the pulsed airflow enters from the top of the filter element 5. The top of the inner sheath 1 blocks the airflow from directly impacting the upper surface of the filter element 5, while the conical surface isolates the airflow from scouring the inner side of the filter element 5, achieving comprehensive protection for the upper part of the filter element 5. Both the outer sealing sleeve 3 and the inner sealing sleeve 4 are made of flexible material, which fills the gap between the filter element 5 and the sheath after being compressed, eliminating gaps in the sealing surface. At the same time, the conical structure of both increases the contact area and avoids stress concentration. The inverted conical design at the upper end of the filter element 5 forms an inclined surface fit with the inner and outer sheaths. When filter element 5 bears its own weight and the weight of the dust, the inclined plane decomposes the gravity into compressive stress perpendicular to the conical surface, rather than shear stress in the traditional structure, fundamentally eliminating the risk of breakage of filter element 5 at the connection.

[0044] The specific embodiments of this utility model disclosed above are merely illustrative of the present utility model. These specific embodiments do not exhaustively describe all details, nor do they limit the utility model to only the described embodiments. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.

Claims

1. A ceramic fiber filter element sealing device with protective function, characterized in that: It includes an inner sheath (1), an outer sheath (2), an outer sealing sleeve (3), and an inner sealing sleeve (4). The upper ends of the inner sheath (1), outer sheath (2), outer sealing sleeve (3), inner sealing sleeve (4), and filter element (5) are all inverted conical structures. A positioning hole is provided on the orifice plate (6). The lower part of the outer sheath (2) is inserted into the positioning hole and connected to the orifice plate (6). The outer sealing sleeve (3) is provided on the inner side of the inverted conical structure of the outer sheath (2). The outer wall of the inverted conical structure at the upper end of the filter element (5) is provided on the inner side of the outer sealing sleeve (3). The inner sealing sleeve (4) is provided on the inner wall of the inverted conical structure at the upper end of the filter element (5). The inner sheath (1) is provided on the inner side of the inner sealing sleeve (4). The inner sheath (1) is connected to the outer sheath (2).

2. The ceramic fiber filter element sealing device with protective function according to claim 1, characterized in that: The inner sleeve (1) has a first flange structure on the outer side of its upper end, and the outer sleeve (2) has a second flange structure on the outer side of its upper end. The first flange structure is connected to the second flange structure.

3. The ceramic fiber filter element sealing device with protective function according to claim 2, characterized in that: The first flange structure has a through hole, and the second flange structure has a threaded hole. A bolt (7) is inserted into the through hole and the bolt (7) is screwed into the threaded hole.

4. A ceramic fiber filter element sealing device with protective function according to claim 3, characterized in that: The number of the first flange structure and the second flange structure are the same and there are multiple of each. Multiple first flange structures are evenly distributed along the circumference of the inner sheath (1), and multiple second flange structures are evenly distributed along the circumference of the outer sheath (2). The positions of the first flange structure and the second flange structure correspond.

5. A ceramic fiber filter element sealing device with protective function according to claim 1, characterized in that: The outer sheath (2) has an inverted conical structure below a straight cylindrical structure, which is inserted into a positioning hole and connected to the orifice plate (6).

6. A ceramic fiber filter element sealing device with protective function according to claim 5, characterized in that: The outer sheath (2) is connected to the perforated plate (6) by welding.

7. A ceramic fiber filter element sealing device with protective function according to claim 1, characterized in that: Both the outer sealing sleeve (3) and the inner sealing sleeve (4) are made of flexible material.

8. A ceramic fiber filter element sealing device with protective function according to claim 1, characterized in that: The filter element (5) is a ceramic fiber filter element.

9. A ceramic fiber filter element sealing device with protective function according to claim 1, characterized in that: The inner sheath (1), outer sheath (2), outer sealing sleeve (3) and inner sealing sleeve (4) are all inverted conical annular structures.

10. A ceramic fiber filter element sealing device with protective function according to claim 9, characterized in that: The inner sheath (1), outer sheath (2), outer sealing sleeve (3), inner sealing sleeve (4) and filter element (5) are aligned at their centers.

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