Elbow occlusion mechanism
By combining flexible seals and rigid snap-fit components, and utilizing chains and locking devices, the problem of elbow leakage was solved, achieving better sealing effect and pressure resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA ACAD OF SAFETY SCI & TECH
- Filing Date
- 2025-06-26
- Publication Date
- 2026-06-16
AI Technical Summary
In existing technologies, the problem with elbow leakage is that the sealing adhesive has weak pressure resistance, is easily dispersed by high-pressure fluids, and is not resistant to long-term chemical corrosion, leading to sealing failure.
The system employs a combination of flexible seals and rigid clamps, and through the cooperation of chains and locking devices, it effectively seals leaks at elbows.
It improves the sealing effect of elbows, has a simple structure, is easy to operate, can effectively press against the leakage point, prevent the flexible seal from misaligning, and enhance pressure resistance.
Smart Images
Figure CN224364561U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe fitting sealing technology, and in particular to a bend sealing mechanism. Background Technology
[0002] Elbows are common pipe fittings in piping systems, primarily used to change the direction of fluid flow. Their applications are wide-ranging, covering industrial, civil, and specialized fields. Because elbows force abrupt changes in fluid direction, they generate centrifugal force and turbulence. Especially in high-pressure or high-speed fluids, continuous impact can accelerate wear on the inner wall. Long-term erosion may lead to thinning of the inner wall (the flow-facing side) of the elbow, eventually causing perforation and leakage. Discontinuous elbow geometry (such as at points of curvature change) can create stress concentration zones, which are prone to developing microcracks under alternating loads (such as pressure fluctuations and vibrations), ultimately leading to leakage.
[0003] In response to leaks at elbows, current technology generally uses sealant to plug the leak points. However, sealant has weak pressure resistance (usually <2MPa), is easily dispersed by high-pressure fluids, and is not resistant to long-term chemical corrosion, thus leading to sealant failure. Utility Model Content
[0004] The purpose of this utility model embodiment is to provide an elbow sealing mechanism that can improve the elbow sealing effect, and its structure is simple and easy to operate.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A bend sealing mechanism is provided, comprising:
[0007] A sealing structure includes a flexible seal and a rigid snap-fit element. The thickness of the rigid snap-fit element extends along a first direction. One side of the rigid snap-fit element along the first direction engages with the flexible seal to restrict the movement of the flexible seal relative to the rigid snap-fit element along a plane perpendicular to the first direction. The edge of the rigid snap-fit element is adjacent to the edge of the flexible seal, and the side of the flexible seal element facing away from the rigid snap-fit element covers the leakage point of the bend.
[0008] A locking structure, comprising a chain and a locking device, wherein the chain passes around the bend and engages with the rigid snap-fit member on the side opposite to the flexible seal, and both ends of the chain along its length are connected to the locking device and tightened by the locking device, so that the flexible seal is pressed against the bend to seal the leakage point.
[0009] As a further embodiment of the elbow sealing mechanism, on the two sides opposite to the flexible seal and the rigid snap-fit member, one side is provided with a limiting protrusion and the other side is provided with a limiting groove. The limiting protrusion is a non-circular structure and the limiting protrusion engages with the limiting groove.
[0010] As a further embodiment of the elbow sealing mechanism, the flexible seal has a protruding limiting protrusion on the side facing the rigid snap-fit member, and the rigid snap-fit member has a recessed limiting groove on the side facing the flexible seal. The limiting protrusion is located in the central region of the flexible seal, and the cross-section of the limiting protrusion is elliptical or polygonal.
[0011] As a further embodiment of the elbow sealing mechanism, the flexible sealing element has a limiting protrusion protruding on the side facing the rigid snap-fit member, and the rigid snap-fit member has a limiting groove recessed on the side facing the flexible sealing element. The limiting protrusion includes a first limiting protrusion and a second limiting protrusion. The first limiting protrusion and the second limiting protrusion protrude from the flexible sealing element and are arranged intersectingly. The first limiting protrusion extends along its length direction to both ends flush with the side surface of the flexible sealing element, and the second limiting protrusion extends along its length direction to both ends flush with the side surface of the flexible sealing element.
[0012] As a further embodiment of the elbow sealing mechanism, the length direction of the first limiting protrusion is perpendicular to the length direction of the second limiting protrusion, and the intersection area of the first limiting protrusion and the second limiting protrusion is located in the central area of the flexible seal.
[0013] As a further embodiment of the elbow sealing mechanism, both the flexible seal and the rigid snap-fit component are cuboid structures. The length of the flexible seal extends along a second direction, and the width of the flexible seal extends along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The first limiting protrusion extends from both ends along the second direction to be flush with the two sides of the flexible seal along the second direction, and the second limiting protrusion extends from both ends along the third direction to be flush with the two sides of the flexible seal along the third direction.
[0014] As a further embodiment of the elbow blocking mechanism, the first limiting protrusion is symmetrical with respect to the center line of the second limiting protrusion extending along its length direction, and the second limiting protrusion is symmetrical with respect to the center line of the first limiting protrusion extending along its length direction.
[0015] As a further embodiment of the elbow sealing mechanism, the rigid snap-fit component has a recessed groove in the central area of the side opposite to the flexible seal. The side of the groove opposite to the flexible seal is open, and both ends of the groove pass through the rigid snap-fit component along its length. The chain is snapped into the groove.
[0016] As a further embodiment of the elbow blocking mechanism, the locking device includes a fixed handle, a movable handle, a first connecting part, a second connecting part, and a hook. One end of the movable handle and one end of the fixed handle are rotatably connected to both ends of the first connecting part, and both ends of the second connecting part are rotatably connected to the fixed handle and the movable handle near the second connecting part, respectively. All rotation axes extend along a second direction. The hook is connected to the end of the fixed handle near the first connecting part. One end of the chain is fixedly connected to the first connecting part, and the other end can bypass the elbow and engage with the hook. The movable handle, the first connecting part, and the second connecting part are arranged in an irregular quadrilateral structure. The included angle between the movable handle and the second connecting part is α. When α is an obtuse angle less than 180°, the locking device is in a non-locking state. When α is greater than 180°, the movable handle is attached to the fixed handle, the locking device is in a locked state, and the chain is tightened and fixed on the elbow.
[0017] As a further embodiment of the elbow sealing mechanism, a slider is connected to the end of the second connecting part away from the movable handle. The fixed handle has a groove along its length, with the opening of the groove facing the movable handle. Two grooves are recessed in opposite groove walls, and the slider slides in cooperation with the grooves. The locking device also includes an adjusting screw. The fixed handle has a threaded hole communicating with the groove at the end away from the first connecting part. The adjusting screw is screwed into the threaded hole and can extend into the groove to abut against the slider.
[0018] Beneficial effects:
[0019] In this invention, after the flexible seal and the rigid clamping member are engaged, the movement of the flexible seal relative to the rigid clamping member along a plane perpendicular to the first direction is restricted. The chain then engages with the side of the rigid clamping member away from the flexible seal. During the locking process of the chain by the locking device, it prevents the flexible seal from moving relative to the rigid clamping member along a plane perpendicular to the first direction, thus avoiding misalignment between the rigid clamping member and the flexible seal and affecting the sealing effect of the flexible seal on the elbow leakage point. Furthermore, the edge of the rigid clamping member is adjacent to the edge of the flexible seal, allowing the rigid clamping member to press the flexible seal against the elbow leakage point, improving the sealing effect. The elbow sealing mechanism of this invention has a good sealing effect, a simple structure, and is easy to operate. Attached Figure Description
[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0021] Figure 1 This is a schematic diagram of the elbow sealing mechanism described in this embodiment of the present invention when sealing the elbow leakage point;
[0022] Figure 2 This is an exploded view of the sealing structure described in an embodiment of the present invention;
[0023] Figure 3 This is a schematic diagram of the locking structure described in an embodiment of the present utility model;
[0024] Figure 4 for Figure 3 A magnified view of part A in the middle;
[0025] Figure 5 This is a schematic diagram showing the fixed handle, movable handle, first connecting part, and second connecting part in an unlocked state according to an embodiment of the present utility model.
[0026] In the picture:
[0027] 1. Elbow;
[0028] 100. Sealing structure; 110. Flexible sealing element; 120. Rigid snap-fit element; 130. Limiting protrusion; 131. First limiting protrusion; 132. Second limiting protrusion; 140. Limiting groove; 150. Slot;
[0029] 200. Locking structure; 210. Chain; 220. Locking device; 221. Fixed handle; 222. Movable handle; 223. First connecting part; 224. Second connecting part; 225. Hook; 226. Slider; 227. Groove; 228. Slide groove; 229. Adjusting screw. Detailed Implementation
[0030] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0033] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.
[0034] like Figure 1 As shown, this embodiment provides a bend sealing mechanism, including a sealing structure 100 and a locking structure 200. The sealing structure 100 includes a flexible seal 110 and a rigid snap-fit member 120. The thickness of the rigid snap-fit member 120 extends along a first direction. The rigid snap-fit member 120 snaps against the flexible seal 110 on one side along the first direction to restrict the movement of the flexible seal 110 relative to the rigid snap-fit member 120 in a plane perpendicular to the first direction (Z direction in the figure). The edge of the rigid snap-fit member 120 is adjacent to the edge of the flexible seal 110. The side of the flexible seal 110 away from the rigid snap-fit member 120 covers the leakage point of the elbow 1. The locking structure 200 includes a chain 210 and a locking device 220. The chain 210 passes around the elbow 1 and snaps against the side of the rigid snap-fit member 120 away from the flexible seal 110. Both ends of the chain 210 along its length direction are connected to the locking device 220 and tightened by the locking device 220 so that the flexible seal 110 abuts against the elbow 1 to seal the leakage point.
[0035] Understandably, after the flexible seal 110 and the rigid clamping member 120 engage, the movement of the flexible seal 110 relative to the rigid clamping member 120 along a plane perpendicular to the first direction is restricted. The chain 210 then engages with the side of the rigid clamping member 120 away from the flexible seal 110. This prevents the flexible seal 110 from moving relative to the rigid clamping member 120 along a plane perpendicular to the first direction during the locking process of the chain 210 via the locking device 220, which could cause the rigid clamping member 120 to misalign with the flexible seal 110 and affect the sealing effect of the flexible seal 110 on the leak point of the elbow 1. Furthermore, the edge of the rigid clamping member 120 is adjacent to the edge of the flexible seal 110, allowing the rigid clamping member 120 to press the flexible seal 110 against the leak point of the elbow 1, thus improving the sealing effect.
[0036] like Figure 2 As shown, on the two sides opposite to the flexible seal 110 and the rigid snap-fit member 120, one side has a protruding limiting protrusion 130, and the other side has a recessed limiting groove 140. The limiting protrusion 130 is a non-circular structure, and the limiting protrusion 130 and the limiting groove 140 engage with each other. In this embodiment, the limiting protrusion 130 is designed as a non-circular structure, and correspondingly, the limiting groove 140 is also a non-circular structure. Through the engaging engagement of the limiting protrusion 130 and the limiting groove 140, the locking and fixing between the flexible seal 110 and the rigid snap-fit member 120 can be achieved. The two sides opposite to the flexible seal 110 and the rigid snap-fit member 120 refer to the side of the flexible seal 110 facing the rigid snap-fit member 120 and the side of the rigid snap-fit member 120 facing the flexible seal 110.
[0037] In this embodiment, the flexible seal 110 has a limiting protrusion 130 protruding on the side facing the rigid snap fastener 120, and the rigid snap fastener 120 has a limiting groove 140 recessed on the side facing the flexible seal 110. The limiting protrusion 130 is located in the central region of the flexible seal 110, and the cross-section of the limiting protrusion 130 is elliptical or polygonal.
[0038] Since the leakage point is generally located in the central area of the flexible seal 110 or adjacent to the central area of the flexible seal 110, in this embodiment, the limiting protrusion 130 is designed in the central area of the flexible seal 110, which can increase the thickness of the flexible seal 110 facing the leakage point of the elbow 1 and improve the sealing effect.
[0039] In other embodiments, the side of the flexible seal 110 away from the rigid snap-fit member 120 can be designed as an arc-shaped surface structure that fits against the outer peripheral surface of the elbow 1, thereby improving the fit between the flexible seal 110 and the elbow 1 and further improving the sealing effect.
[0040] Of course, in other embodiments, the limiting protrusion 130 can also extend to the edge of the flexible seal 110, and the structure of the limiting groove 140 corresponds to the structure of the limiting protrusion 130. After the limiting protrusion 130 and the limiting groove 140 can be connected, the snap-fit stability between the flexible seal 110 and the rigid snap-fit member 120 can be improved. Figure 2 As shown, the flexible seal 110 has a limiting protrusion 130 protruding on the side facing the rigid snap fastener 120, and the rigid snap fastener 120 has a limiting groove 140 recessed on the side facing the flexible seal 110. The limiting protrusion 130 includes a first limiting protrusion 131 and a second limiting protrusion 132. The first limiting protrusion 131 and the second limiting protrusion 132 protrude from the flexible seal 110 and are arranged intersectingly. The first limiting protrusion 131 extends along its length direction to both ends to be flush with the side of the flexible seal 110, and the second limiting protrusion 132 extends along its length direction to both ends to be flush with the side of the flexible seal 110.
[0041] In this embodiment, the first limiting protrusion 131 and the second limiting protrusion 132 are designed to cross each other, which can increase the contact area between the limiting protrusion 130 and the limiting groove 140, thereby improving the snap-fit stability.
[0042] For example, the length direction of the first limiting protrusion 131 is perpendicular to the length direction of the second limiting protrusion 132, and the intersection area of the first limiting protrusion 131 and the second limiting protrusion 132 is located in the central area of the flexible seal 110. The limiting protrusion 130 has a "cross-shaped" structure, and correspondingly, the limiting groove 140 also has a "cross-shaped" structure.
[0043] Furthermore, both the flexible seal 110 and the rigid snap-fit member 120 are cuboid structures. The length of the flexible seal 110 extends along the second direction (X direction in the figure), and the width of the flexible seal 110 extends along the third direction (Y direction in the figure). The first direction, the second direction, and the third direction are perpendicular to each other. The first limiting protrusion 131 extends from both ends along the second direction to be flush with the two sides of the flexible seal 110 along the second direction, and the second limiting protrusion 132 extends from both ends along the third direction to be flush with the two sides of the flexible seal 110 along the third direction.
[0044] In this embodiment, by designing the length of the first limiting protrusion 131 to extend along the length direction of the flexible seal 110 and the length of the second limiting protrusion 132 to extend along the width direction of the flexible seal 110, when the chain 210 is tightened by the locking device 220, the chain 210 will move along the outer periphery of the elbow 1. The limiting protrusion 130 of this structure is engaged with the limiting groove 140, which can effectively prevent the chain 210 from dragging the rigid engaging part 120 to move relative to the flexible seal 110 and affecting the sealing effect of the flexible seal 110 on the leakage point of the elbow 1.
[0045] Furthermore, the first limiting protrusion 131 is symmetrical with respect to the center line of the second limiting protrusion 132 extending along its length direction, and the second limiting protrusion 132 is symmetrical with respect to the center line of the first limiting protrusion 131 extending along its length direction.
[0046] It is understood that the second limiting protrusion 132 has a center line extending along its own length direction, and the first limiting protrusion 131 is symmetrical with respect to this center line; similarly, the first limiting protrusion 131 has a center line extending along its own length direction, and the second limiting protrusion 132 is symmetrical with respect to this center line. In this embodiment, the limiting protrusion 130 is designed as a symmetrical structure, which facilitates the alignment and engagement of the limiting groove 140 and the limiting protrusion 130, thereby improving the sealing efficiency.
[0047] In some other embodiments, the limiting protrusion 130 can be designed on the rigid snap-fit member 120, and the corresponding limiting groove 140 can be designed on the flexible seal member 110, which can also achieve the snap-fit between the flexible seal member 110 and the rigid snap-fit member 120.
[0048] Furthermore, a groove 150 is recessed in the central region of the rigid snap-fit component 120 on the side opposite to the flexible seal 110. The side of the groove 150 opposite to the flexible seal 110 is open, and both ends of the groove 150 extend through the rigid snap-fit component 120 along its length. The chain 210 is snapped into the groove 150. This structural design of the groove 150 on the rigid snap-fit component 120 allows the chain 210 to be smoothly snapped into the groove 150, and the locking device 220 tightens the chain 210, causing the chain 210 to press against the central region of the rigid snap-fit component 120.
[0049] In this embodiment, the flexible seal 110 and the limiting protrusion 130 are integrally formed structures.
[0050] Furthermore, such as Figure 3 and Figure 4As shown, the locking device 220 includes a fixed handle 221, a movable handle 222, a first connecting part 223, a second connecting part 224, and a hook 225. One end of the movable handle 222 and one end of the fixed handle 221 are rotatably connected to both ends of the first connecting part 223, and both ends of the second connecting part 224 are rotatably connected to the fixed handle 221 and the movable handle 222 near the second connecting part 224, respectively. All rotation axes extend along a second direction. The hook 225 is connected to the end of the fixed handle 221 near the first connecting part 223. One end of the chain 210 is fixedly connected to the first connecting part 223, and the other end can bypass the bend 1 and engage with the hook 225. The movable handle 222, the first connecting part 223, and the second connecting part 224 are arranged in an irregular quadrilateral structure. The included angle between the movable handle 222 and the second connecting part 224 is α. When α is an obtuse angle less than 180°, the locking device 220 is in a non-locked state (see reference). Figure 5 When a is greater than 180°, the movable handle 222 is attached to the fixed handle 221, the locking device 220 is in a locked state, and the chain 210 is tightened and fixed on the elbow 1.
[0051] In this embodiment, one end of the chain 210 is connected to the first connecting part 223, and the other end is engaged with the hook 225 fixed to the end of the fixed handle 221. Then, the operator holds the fixed handle 221 and the movable handle 222, causing the movable handle 222 to rotate relative to the first connecting part 223 and the second connecting part 224. The second connecting part 224 and the second connecting part 224 rotate relative to the fixed handle 221 at the same time, causing deformation of the non-regular quadrilateral structure. This increases the angle α between the movable handle 222 and the second connecting part 224 (the interior angle between the movable handle 222 and the second connecting part 224, i.e., the angle within the quadrilateral) from an obtuse angle less than 180° to a value greater than 180°. This allows the movable handle 222 to move closer to the fixed handle 221 and remain fixed relative to the fixed handle 221 when no external force is applied, preventing the hook 225 from separating from the chain 210 and affecting the tension of the chain 210.
[0052] Conversely, when it is necessary to unlock, pull the movable handle 222 in the opposite direction to reduce the included angle α between the movable handle 222 and the second connecting part 224 from greater than 180° to an obtuse angle less than 180°. At this time, the hook 225 and the chain 210 can be disengaged and separated.
[0053] Furthermore, the end of the second connecting part 224 away from the movable handle 222 is connected to a slider 226, and the fixed handle 221 has a groove 227 along its length direction. The opening of the groove 227 faces the movable handle 222, and the two opposite groove walls of the groove 227 are recessed with sliding grooves 228. The slider 226 slides in the sliding grooves 228. The locking device 220 also includes an adjusting screw 229. The end of the fixed handle 221 away from the first connecting part 223 is provided with a threaded hole communicating with the groove 227. The adjusting screw 229 is screwed into the threaded hole and can extend into the groove 227 to abut against the slider 226.
[0054] When the operator holds the fixed handle 221 and the movable handle 222, and rotates the movable handle 222 towards the fixed handle 221, the slider 226 abuts against the end of the adjusting screw 229 that extends into the groove 227. By turning the adjusting screw 229, the length of the adjusting screw 229 extending into the groove 227 can be adjusted, that is, the angle between the second connecting part 224 and the movable handle 222 can be adjusted, thereby adjusting the tension of the chain 210.
[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A bend sealing mechanism, characterized in that, include: A sealing structure includes a flexible seal and a rigid snap-fit element. The thickness of the rigid snap-fit element extends along a first direction. One side of the rigid snap-fit element along the first direction engages with the flexible seal to restrict the movement of the flexible seal relative to the rigid snap-fit element along a plane perpendicular to the first direction. The edge of the rigid snap-fit element is adjacent to the edge of the flexible seal, and the side of the flexible seal element facing away from the rigid snap-fit element covers the leakage point of the bend. A locking structure, comprising a chain and a locking device, wherein the chain passes around the bend and engages with the rigid snap-fit member on the side opposite to the flexible seal, and both ends of the chain along its length are connected to the locking device and tightened by the locking device, so that the flexible seal is pressed against the bend to seal the leakage point.
2. The elbow sealing mechanism according to claim 1, characterized in that, On the two sides opposite to the flexible seal and the rigid snap-fit member, one side is provided with a limiting protrusion and the other side is provided with a limiting groove. The limiting protrusion is a non-circular structure and the limiting protrusion engages with the limiting groove.
3. The elbow sealing mechanism according to claim 2, characterized in that, The flexible seal has a limiting protrusion protruding on the side facing the rigid snap-fit member, and the rigid snap-fit member has a limiting groove recessed on the side facing the flexible seal. The limiting protrusion is located in the central region of the flexible seal, and the cross-section of the limiting protrusion is elliptical or polygonal.
4. The elbow sealing mechanism according to claim 2, characterized in that, The flexible seal has a limiting protrusion protruding on the side facing the rigid snap-fit member, and the rigid snap-fit member has a limiting groove recessed on the side facing the flexible seal. The limiting protrusion includes a first limiting protrusion and a second limiting protrusion. The first limiting protrusion and the second limiting protrusion protrude from the flexible seal and are arranged intersectingly. The first limiting protrusion extends along its length to both ends flush with the side of the flexible seal, and the second limiting protrusion extends along its length to both ends flush with the side of the flexible seal.
5. The elbow sealing mechanism according to claim 4, characterized in that, The length direction of the first limiting protrusion is perpendicular to the length direction of the second limiting protrusion, and the intersection area of the first limiting protrusion and the second limiting protrusion is located in the central area of the flexible seal.
6. The elbow sealing mechanism according to claim 4, characterized in that, Both the flexible seal and the rigid snap-fit component are cuboid structures. The length of the flexible seal extends along the second direction, and the width of the flexible seal extends along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The first limiting protrusion extends from both ends along the second direction to be flush with the two sides of the flexible seal along the second direction, and the second limiting protrusion extends from both ends along the third direction to be flush with the two sides of the flexible seal along the third direction.
7. The elbow sealing mechanism according to claim 6, characterized in that, The first limiting protrusion is symmetrical with respect to the center line of the second limiting protrusion extending along its length direction, and the second limiting protrusion is symmetrical with respect to the center line of the first limiting protrusion extending along its length direction.
8. The elbow sealing mechanism according to claim 1, characterized in that, The rigid snap-fit component has a recessed groove in the central area of the side opposite to the flexible seal. The side of the groove opposite to the flexible seal is open, and both ends of the groove pass through the rigid snap-fit component along its length. The chain is snapped into the groove.
9. The elbow sealing mechanism according to any one of claims 1 to 8, characterized in that, The locking device includes a fixed handle, a movable handle, a first connecting part, a second connecting part, and a hook. One end of the movable handle and one end of the fixed handle are rotatably connected to both ends of the first connecting part, and both ends of the second connecting part are rotatably connected to the fixed handle and the movable handle near the second connecting part, respectively. All rotation axes extend along a second direction. The hook is connected to the end of the fixed handle near the first connecting part. One end of the chain is fixedly connected to the first connecting part, and the other end can bypass the bend and engage with the hook. The movable handle, the first connecting part, and the second connecting part are arranged in an irregular quadrilateral structure. The included angle between the movable handle and the second connecting part is α. When α is an obtuse angle less than 180°, the locking device is in a non-locking state. When α is greater than 180°, the movable handle is attached to the fixed handle, the locking device is in a locked state, and the chain is tightened and fixed on the bend.
10. The elbow sealing mechanism according to claim 9, characterized in that, The second connecting part is connected to a slider at one end away from the movable handle. The fixed handle has a groove along its length, with the opening of the groove facing the movable handle. The two opposite groove walls of the groove are recessed with sliding grooves, and the slider slides in the sliding grooves. The locking device also includes an adjusting screw. The fixed handle at one end away from the first connecting part has a threaded hole communicating with the groove. The adjusting screw is screwed into the threaded hole and can extend into the groove to abut against the slider.