Telescopic joint and sealing structure with same

Abstract

The utility model provides an expansion joint and a sealing structure with the expansion joint, and belongs to the technical field of chemical production, the expansion joint is characterized in that a plurality of bending sections are arranged on a part of the pipe wall of a pipeline piece along the radial direction in an extending manner, the plurality of bending sections are arranged at intervals, and an adjusting part is arranged between every two adjacent bending sections in the axial direction of the pipeline piece; according to the utility model, when the pipeline piece is initially installed, the bent sections are perpendicular to the pipe wall of the pipeline piece, the two bent sections are spaced to form the adjusting part, the pipeline piece is stretched or compressed under the action of external force, and the bent sections and the pipe wall form an inclined angle under the action of the external force, namely the bent sections are pulled open or compressed; the adjusting part is extruded or stretched, so that the adjusting distance of the adjusting part in the axial direction is larger.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to an expansion joint and a sealing structure having the same. Background Technology

[0002] Hydrogen fluoride (HF) is a highly corrosive and toxic chemical widely used in the chemical industry, such as in the manufacture of refrigerants, fluoropolymers, pharmaceuticals, and chemicals for the electronics industry. In handling hydrogen fluoride, a rotary reactor is used to carry out a series of chemical reactions, and a screw conveyor is used to transport the material into the rotary reactor. Due to the extremely corrosive nature of hydrogen fluoride, a sealing device is installed between the screw conveyor and the rotary reactor to prevent leakage.

[0003] Chinese patent document CN116067174A discloses a spiral conveying sealing mechanism for a hydrogen fluoride rotary reactor, comprising: a furnace body, a spiral conveying sealing mechanism body, and a dynamic and static ring sealing device. The furnace body is rotatably connected to a frame, and one end of the spiral conveying sealing mechanism body extends into the furnace body. The dynamic and static ring sealing device is located at the connection between the furnace body and the spiral conveying sealing mechanism body. The dynamic and static ring sealing device includes: a dynamic sealing ring, a static sealing ring, and an expansion joint. The dynamic sealing ring is rotatably mounted on the furnace body, the static sealing ring is mounted on the spiral conveying sealing mechanism body, and an expansion joint is provided between the dynamic sealing ring and the static sealing ring.

[0004] Existing expansion joints are equipped with flanges, which are bolted to the dynamic and static sealing rings respectively. However, the cross-section of the existing expansion joints is wavy, resulting in a shorter expansion distance. When the furnace reaches high temperatures, the expansion joints tend to shrink excessively, leading to a shortened lifespan and poor sealing performance. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the defect that the wavy expansion joint in the prior art has a short expansion distance in the hydrogen fluoride reaction, resulting in a shortened life, thereby providing an expansion joint and a sealing structure having it.

[0006] To solve the above-mentioned technical problems, this utility model provides an expansion joint, including: a pipe component, wherein a portion of the pipe wall of the pipe component is provided with a plurality of bent sections extending radially therefrom, the plurality of bent sections are spaced apart, and an adjustment part is provided between two adjacent bent sections in the axial direction of the pipe component;

[0007] The adjusting part has a first state in which it is perpendicular to the axis of the pipe component; a second state in which the bent section moves away from both ends of the pipe component when the pipe component is stretched in its axial direction; and a third state in which the bent section moves closer to both ends of the pipe component when the pipe component is compressed in its axial direction.

[0008] Preferably, the bent section is provided on a portion of the pipe wall of the pipe fitting that extends radially outward to form a protrusion.

[0009] Preferably, the bent section is provided in a groove that extends radially outward from a portion of the pipe wall of the pipe fitting.

[0010] Preferably, the two ends of the pipeline component in the axial direction are provided with fixing structures for detachable connection to the outside.

[0011] Preferably, the fixing structure includes: a first flange and a second flange, wherein the first flange and the second flange are disposed at both ends of the pipeline component and extend radially outward.

[0012] In addition, a sealing structure is also provided, comprising:

[0013] Furnace body;

[0014] A conveying structure, one end of which passes through the furnace body;

[0015] A sealing structure is provided at the connection between the furnace body and the conveying structure, and the sealing structure includes the expansion joint described in any one of the above technical solutions.

[0016] Preferably, the sealing structure includes a dynamic sealing ring and a static sealing ring, wherein the dynamic sealing ring is rotatably disposed on the furnace body;

[0017] A static sealing ring is fixedly disposed on the outer end face of the conveying structure and extends radially outward;

[0018] The expansion joint is detachably connected to the dynamic sealing ring and the static sealing ring.

[0019] Preferably, it further includes: a first sealing element and a second sealing element, wherein the first sealing element is detachably connected to the dynamic sealing ring, and the second sealing element is detachably connected to the static sealing ring; the two ends of the expansion joint are provided with a first flange and a second flange in the axial direction;

[0020] The first sealing element clamps and fixes the first flange with the dynamic sealing ring, and the second sealing element clamps and fixes the second flange with the static sealing ring.

[0021] Preferably, the first seal and the second seal are annular.

[0022] The technical solution of this utility model has the following advantages:

[0023] 1. The expansion joint provided by this utility model, when the pipeline is initially installed, the bending section is set perpendicular to the pipe wall of the pipeline, and an adjustment part is formed between the two bending sections. At this time, a space is formed between the two bending sections. When the pipeline is subjected to external force, it is stretched or compressed. At this time, the bending section will form an inclined angle with the pipe wall under the action of external force, that is, the bending section is pulled apart or compressed, and the adjustment part is squeezed or stretched, so that its adjustment distance in the axial direction is greater.

[0024] 2. The expansion joint provided by this utility model, by setting protrusions, makes the bending section have a certain elasticity when subjected to pressure or tension, thereby absorbing and dispersing stress to a certain extent and reducing the deformation or damage of pipeline components caused by external forces during use.

[0025] 3. The sealing structure provided by this utility model allows the furnace body to expand due to heat during high-temperature processes, causing it to expand a certain distance along the conveying structure. The expansion joint can adapt to this thermal expansion, ensuring a good seal between the furnace body and the conveying structure. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a front view of a telescopic joint provided in one embodiment of the present invention;

[0028] Figure 2 for Figure 1 AA section view in the middle;

[0029] Figure 3 This is a front view of a sealing structure provided in one embodiment of the present invention;

[0030] Figure 4 for Figure 3 An enlarged view of the sealing structure.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Pipeline fittings; 2. Bending section; 3. Protrusion; 4. First flange; 5. Second flange; 6. Furnace body; 7. Conveying structure; 8. Dynamic sealing ring; 9. Static sealing ring; 10. First sealing element; 11. Second sealing element. Detailed Implementation

[0033] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0037] The expansion joint provided in this embodiment is used for sealing between the hydrogen fluoride reactor and the screw conveyor structure 7.

[0038] like Figure 1 , Figure 2 As shown, this is a specific embodiment of the expansion joint provided in this example, including: a pipe component 1, which is made of a flexible material and can undergo a certain elastic deformation under external force. A portion of the pipe wall of the pipe component 1 extends radially with multiple bends 2, each bend 2 being annular. The multiple bends 2 are spaced apart, and adjacent bends 2 have adjustment portions in the axial direction of the pipe component 1.

[0039] The pipe fitting 1 has three states: a first state where the adjusting part is perpendicular to the axis of the pipe fitting 1; a second state where the adjusting part has the largest adjustment space by setting the bending section 2 perpendicular to the adjusting part; a third state where the bending section 2 moves away from both ends of the pipe fitting 1 when the pipe fitting 1 is stretched in its axial direction; and a fourth state where the bending section 2 moves closer to both ends of the pipe fitting 1 when the pipe fitting 1 is compressed in its axial direction.

[0040] When the pipe fitting 1 is initially installed, the bent section 2 is set perpendicular to the pipe wall of the pipe fitting 1, and an adjustment part is formed between the two bent sections 2. At this time, a space is formed between the two bent sections 2. When the pipe fitting 1 is subjected to external force, it is stretched or compressed. At this time, the bent section 2 will form an inclined angle with the pipe wall under the action of external force. That is, the bent section 2 is pulled apart or compressed, and the adjustment part is squeezed or stretched, so that its adjustment distance in the axial direction is greater.

[0041] like Figure 1 As shown, in this embodiment, the bent section 2 extends radially outward from a portion of the pipe wall of the pipe fitting 1 to form a protrusion 3. The protrusion 3 is annular and surrounds the circumference of the pipe wall of the pipe fitting 1. The protrusion 3 includes a first end face that is parallel to each other and a second end face connected to the top of a vertical surface. The lower end of the first end face is perpendicularly connected to the pipe fitting, and the upper end of the first end face is perpendicularly connected to the second end face. At this time, the bending section 2 has a larger stretching and contraction distance in the axial direction. The adjustment part is the space between the two oppositely arranged inner wall surfaces of the protrusion 3. When compressed, the bent section 2 moves toward each other; when stretched, the bent section 2 moves away from each other. By setting the protrusion 3, the bent section 2 has a certain elasticity when subjected to pressure or tension, thereby absorbing and dispersing stress to a certain extent and reducing the deformation or damage of the pipe fitting 1 caused by external forces during use. In addition, by precisely controlling the height and width of the protrusion 3, the stiffness and flexibility of the bent section 2 can be adjusted.

[0042] Alternatively, as an alternative implementation, the bent section 2 is provided in a groove formed by extending radially outward along a portion of the pipe wall of the pipe component 1. In this case, the adjustment part is the space between two opposing sidewalls of the groove. Axial adjustment of the pipe component 1 can also be achieved by extending the bent section 2 radially inward.

[0043] like Figure 1 As shown, in this embodiment, the pipe component 1 has fixing structures at both ends of its axial direction for detachable connection with the outside. The fixing structures extend radially outward, facilitating detachable connection with the external structure and thus making it easy to install the pipe component 1 to the connection point requiring sealing. Alternatively, as an alternative implementation, if the fixing structures are not provided, the pipe component 1 can be fixed by bolts.

[0044] like Figure 1 As shown, in this embodiment, the fixing structure includes a first flange 4 and a second flange 5. The first flange 4 and the second flange 5 are respectively disposed at both ends of the axial direction of the pipe fitting 1 and extend radially outward. The first flange 4 and the second flange 5 allow for detachable connection to the outside, such as bolt connection or flange connection. Alternatively, as an alternative implementation, the fixing structure can also be a clamp, which is used to fix the pipe fitting 1 to the outer wall using an elastic clamp, enabling quick installation and disassembly.

[0045] Specifically, the expansion joint is 5mm thick, the second bending section is 3mm thick, and the maximum tensile length of the expansion joint is 300mm. The expansion joint is made of polytetrafluoroethylene.

[0046] In addition, such as Figure 3 The diagram illustrates a specific embodiment of the sealing structure provided in this example, comprising: a furnace body 6, used for production processing in a hydrogen fluoride reaction; and a conveying structure 7 for conveying materials into the furnace body 6 for reaction. One end of the conveying structure 7 extends through the furnace body 6 and into its interior. A sealing structure is provided at the connection between the furnace body 6 and the conveying structure 7 to seal the gap between them, preventing the leakage of toxic or harmful gases or materials. The sealing structure includes an expansion joint as described in any of the above technical solutions. When the furnace body 6 is operating at high temperatures, it expands due to heat, causing it to expand a certain distance along the conveying structure 7. The expansion joint can accommodate this thermal expansion, ensuring a good seal between the furnace body 6 and the conveying structure 7. Specifically, the specific structures of the hydrogen fluoride reactor and the conveying structure 7 are existing technologies and will not be described further in this embodiment.

[0047] like Figure 4As shown, in this embodiment, the sealing structure includes a dynamic sealing ring 8 and a static sealing ring 9. The dynamic sealing ring 8 is rotatably mounted on the furnace body 6. The connection method between the dynamic sealing ring 8 and the furnace body 6 is existing technology and will not be described in detail in this embodiment. Specifically, the furnace body 6 is a rotary kiln. When the rotary kiln rotates, the dynamic sealing ring 8 is rotatably connected to the furnace body 6, but the dynamic sealing ring 8 itself does not rotate. The static sealing ring 9 is fixedly mounted on the outer end face of the pipe wall of the conveying structure 7 and extends radially outward. The expansion joint is detachably connected to the dynamic sealing ring 8 and the static sealing ring 9. In equipment such as rotary kilns, due to high-temperature operation and temperature changes, the furnace body 6 and the conveying structure 7 will experience thermal expansion and contraction. The expansion joint can well adapt to this change and avoid the sealing effect between the furnace body 6 and the conveying structure 7 deteriorating due to temperature changes. Through the tight cooperation between the expansion joint and the dynamic sealing ring 8 and the static sealing ring 9, the leakage of materials or gases can be effectively prevented. Alternatively, as an alternative implementation, the sealing structure may also include: a clamping cylinder, which is fixedly installed, and the driving end of the clamping cylinder is connected to the static sealing ring 9 for driving the static sealing ring 9 to move toward the dynamic sealing element.

[0048] like Figure 4 As shown, in this embodiment, it further includes: a first sealing element 10 and a second sealing element 11, which are annular flanges. The first sealing element 10 is disposed on one side of the dynamic sealing ring 8 and is detachably connected to the dynamic sealing ring 8. The second sealing element 11 is detachably connected to the static sealing ring 9. The two ends of the expansion joint axially are provided with a first flange 4 and a second flange 5; the first sealing element 10 and the dynamic sealing ring 8 clamp and fix the first flange 4. After the first sealing element 10 and the dynamic sealing ring 8 are respectively clamped to both sides of the first flange 4, the bolt passes through the first sealing element 10 and the dynamic sealing ring 8 and is connected to the nut. At this time, the first sealing element 10 and the dynamic sealing ring 8 are respectively disposed on both sides of the first flange 4. By tightening the nut, the first sealing element 10 and the dynamic sealing ring 8 are clamped together, thereby fixing the first flange 4. The second sealing element 11 and the static sealing ring 9 are clamped on both sides of the second flange 5. After passing through the second sealing element 11 and the static sealing ring 9, the bolts are connected to the nuts. Tightening the nuts secures the second sealing element 11 and the static sealing ring 9 to the second flange 5. The design of the expansion joint makes the connection between the dynamic sealing ring 8 and the static sealing ring 9 more flexible and convenient. This detachable connection method not only simplifies the equipment installation process but also facilitates the inspection and replacement of the sealing structure during equipment maintenance, reducing maintenance costs and time. Alternatively, as an alternative implementation, if the first sealing element 10 and the second sealing element 11 are not provided, the expansion joint can also be fixed by bolts passing through the first flange 4 and the second flange 5.

[0049] like Figure 4As shown, in this embodiment, the first seal 10 and the second seal 11 are annular. The first seal 10 includes two semi-circular flanges that can form a complete circular flange. The second seal 11 also includes two semi-circular flanges. The annular seals can provide uniform sealing pressure, effectively prevent media leakage, and ensure the sealing performance of the system. The annular structure makes it easier to install and disassemble, reducing maintenance costs and work difficulty. Alternatively, as an alternative implementation, the first seal 10 and the second seal 11 can be square, with circular holes provided on both.

[0050] Working principle of the expansion joint: The pipe fitting 1 has a first flange 4 and a second flange 5 at both ends. A portion of the pipe wall of the pipe fitting 1 extends radially outward with a bent section 2, forming a protrusion 3. An adjustment section is formed between the two opposing inner end faces of the protrusion 3. Initially, the bent section 2 is perpendicular to the axis of the pipe fitting 1, at which point the axial adjustment length of the pipe fitting 1 is at its maximum. When subjected to external force, the axial ends of the pipe fitting 1 are compressed, causing the connection points between the two bent sections 2 of the protrusion 3 and the pipe wall to move closer together. Since the adjustment distance between the bent sections 2 is equal to the width of the protrusion 3, it has a large adjustment range. By setting multiple protrusions 3 and bent sections 2, the adjustable range of the pipe fitting 1 is increased.

[0051] Installation method of the sealing structure: One end of the conveying structure 7 penetrates into the interior of the furnace body 6, and the conveying structure 7 can convey materials into the furnace body 6. The furnace body 6 is a rotary kiln. A sealing structure is provided between the conveying structure 7 and the main body. The sealing structure includes a dynamic sealing ring 8, a static sealing ring 9, and an expansion joint. The static sealing ring 9 is provided on the outer wall of the conveying structure 7 and extends radially outward. The dynamic sealing ring 8 is rotatably mounted on the furnace body 6. The first sealing element 10 abuts against the first flange 4, and is then bolted to the dynamic sealing ring 8. The second sealing ring abuts against the second flange 5, and is then bolted to the static sealing ring 9.

[0052] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. An expansion joint, characterized in that, include: Pipeline component (1), wherein a portion of the pipe wall of the pipeline component (1) is provided with a plurality of bends (2) extending radially thereon, the plurality of bends (2) being spaced apart, and an adjustment portion being provided between two adjacent bends (2) in the axial direction of the pipeline component (1); The adjustment part has a first state in which it is perpendicular to the axis of the pipe component (1); a second state in which the bending section (2) moves away from both ends of the pipe component (1) when the pipe component (1) is stretched in its axial direction; and a third state in which the bending section (2) moves closer to both ends of the pipe component (1) when the pipe component (1) is compressed in its axial direction.

2. The expansion joint according to claim 1, characterized in that, The bent section (2) is provided on a portion of the pipe wall of the pipe fitting (1) that extends radially outward to form a protrusion (3).

3. The expansion joint according to claim 1, characterized in that, The bent section (2) is provided on a portion of the pipe wall of the pipe fitting (1) that extends radially outward to form a groove.

4. The expansion joint according to any one of claims 1-3, characterized in that, The pipe fitting (1) has fixed structures at both ends in the axial direction for detachable connection with the outside.

5. The expansion joint according to claim 4, characterized in that, The fixing structure includes a first flange (4) and a second flange (5), wherein the first flange (4) and the second flange (5) are disposed at both ends of the pipeline component (1) and extend radially outward.

6. A sealing structure, characterized in that, include: Furnace body (6); A conveying structure (7), one end of which passes through the furnace body (6); A sealing structure is provided at the connection between the furnace body (6) and the conveying structure (7), and the sealing structure includes the expansion joint as described in any one of claims 1-5.

7. The sealing structure according to claim 6, characterized in that, The sealing structure includes a dynamic sealing ring (8) and a static sealing ring (9), wherein the dynamic sealing ring (8) is rotatably disposed on the furnace body (6); A static sealing ring (9) is fixedly disposed on the outer end face of the conveying structure (7) and extends radially outward; The expansion joint is detachably connected to the dynamic sealing ring (8) and the static sealing ring (9).

8. The sealing structure according to claim 7, characterized in that, Also includes: The first sealing element (10) and the second sealing element (11) are provided. The first sealing element (10) is detachably connected to the dynamic sealing ring (8), and the second sealing element (11) is detachably connected to the static sealing ring (9). The two ends of the telescopic joint are provided with a first flange (4) and a second flange (5) in the axial direction. The first sealing element (10) clamps and fixes the first flange (4) with the dynamic sealing ring (8), and the second sealing element (11) clamps and fixes the second flange (5) with the static sealing ring (9).

9. The sealing structure according to claim 8, characterized in that, The first seal (10) and the second seal (11) are annular.

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