A seal structure for an aluminum alloy window edge

Abstract

The application relates to a seal structure for an aluminum alloy window sealing edge, in particular to a one-piece seal structure for an aluminum alloy window sealing edge, which has a constant cross section along the length direction. The cross section comprises a base part for fixing the seal structure body for the aluminum alloy window sealing edge, a cavity part provided with a hollow compression cavity, and a sealing part connected with the cavity part. The wall body of the cavity part comprises a pressure-bearing back plate connected with the base part and an elastic arc surface connected with the sealing part. The sealing part comprises a main sealing rib extending from the independent elastic arc surface and a secondary sealing rib arranged below the main sealing rib. The seal structure for the aluminum alloy window sealing edge is firmly fixed with the mounting groove through the above structure design, and when being extruded, the hollow compression cavity is deformed and the main and secondary sealing ribs of the sealing part are cooperated to provide excellent sealing performance and buffering performance, meanwhile, the structure is compact, the installation is convenient, and the sealing reliability and service life of the equipment or component are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of sealing technology, and in particular to a one-piece molded sealing strip structure for sealing aluminum alloy windows, which has excellent sealing performance and is easy to install. Background Technology

[0002] In various industrial and civil equipment, seals are an indispensable component. Their function is to prevent liquid or gas leakage, block dust and impurities from entering, and provide cushioning and shock absorption. Traditional seals, especially edge seals used in structures such as doors, windows, and enclosures, and the sealing strips used for sealing aluminum alloy windows, are usually made of materials such as rubber or plastic and are fixed in the mounting groove by means of extrusion, bonding, or snap-fit.

[0003] However, the existing sealing strip structure for aluminum alloy window edge sealing has at least two specific pain points or shortcomings: 1. Insufficient Installation Secureness and Prone to Detachment: Many existing sealing strip structures for aluminum alloy window edging rely on simple compression or bonding during installation, resulting in limited bonding strength with the mounting groove. For example, some snap-on sealing strip structures for aluminum alloy window edging only use a few protrusions to snap into the groove. During long-term use, due to material aging, external vibration, or repeated opening and closing, the snaps are prone to wear or failure, causing the sealing strip structure to loosen, shift, or even detach, thus losing its sealing function. Once the sealing strip structure for aluminum alloy window edging detaches, not only does it require reinstallation or replacement, increasing maintenance costs, but it may also lead to the failure of the protection of the sealed space, causing more serious problems.

[0004] 2. Limited Sealing Performance and Poor Durability: Most existing sealing strips used for aluminum alloy window edging only provide a single pressure seal or expansion seal function. Their structural design is often relatively simple, lacking the ability to adapt to external stresses of different directions or degrees. For example, when subjected to large or continuous compression, the single-structure sealing strips used for aluminum alloy window edging are prone to excessive deformation, leading to material fatigue or permanent deformation, which in turn reduces sealing performance. Furthermore, many hollow sealing strips used for aluminum alloy window edging exhibit undesirable internal cavity shape changes after compression, failing to effectively resist high pressure or prolonged loads, resulting in seal failure and shortened service life. This deficiency is particularly prominent in industrial applications requiring high reliability.

[0005] To address the above issues, there is an urgent need in this field for a sealing strip structure product for aluminum alloy window edge sealing that has a more reasonable structure, more secure installation, better sealing effect, and greater durability. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a sealing strip structure for aluminum alloy window edge sealing, which more accurately solves the problems mentioned in the background art.

[0007] This invention is achieved through the following technical solution: This invention proposes a sealing strip structure for aluminum alloy window edge sealing, comprising an integrally formed sealing strip structure body for aluminum alloy window edge sealing, characterized in that the sealing strip structure body for aluminum alloy window edge sealing has a constant cross-section along its length direction, the cross-section comprising: The base portion is used to fix the sealing strip structure body for sealing aluminum alloy windows into the mounting groove; The cavity portion is fixedly connected to one side of the base portion, and its interior is provided with a hollow compression cavity; and A sealing portion is fixedly connected to the side of the cavity portion away from the base portion; The cavity wall includes a pressure-bearing back plate connected to the base and an elastic arc surface connected to the sealing part; The sealing part includes a primary sealing strip structure extending from the elastic arc surface for sealing the aluminum alloy window edge and a secondary sealing rib disposed below the primary sealing strip structure for sealing the aluminum alloy window edge.

[0008] Preferably, the base portion includes a necked portion, and the pressure-bearing back plate is connected to the necked portion; the base portion also includes an upper locking hook and a lower locking hook extending from the upper and lower sides of the necked portion, respectively.

[0009] Preferably, both the upper and lower locking barbs extend in a direction away from the cavity portion and have upper and lower barb tips respectively facing the base portion.

[0010] Preferably, the base portion further includes a T-shaped base plate, which is fixedly connected to the end of the necked portion away from the cavity portion.

[0011] Preferably, the cross-section of the hollow compression cavity is teardrop-shaped, the arcuate portion of the teardrop-shaped cross-section corresponds to the elastic arc surface, and the straight portion of the teardrop-shaped cross-section corresponds to the pressure-bearing back plate.

[0012] Preferably, the wall thickness of the elastic arc surface is less than the wall thickness of the pressure-bearing back plate.

[0013] Preferably, the sealing strip structure for sealing aluminum alloy windows is a blade-shaped structure, extending upward at an acute angle away from the cavity portion from the upper part of the elastic arc surface, and the free end of the sealing strip structure for sealing aluminum alloy windows away from the elastic arc surface forms a smoothly transitioned tip of the sealing strip structure for sealing aluminum alloy windows.

[0014] Preferably, the secondary sealing rib is a rib-shaped structure, located in the middle of the elastic arc surface and below the main sealing strip structure used for sealing aluminum alloy windows, extending in a direction away from the cavity portion.

[0015] Preferably, an open sealing gap cavity is formed between the lower surface of the main sealing strip structure used for sealing aluminum alloy window edges, the upper surface of the secondary sealing rib, and the elastic arc surface.

[0016] The installation method for the sealing strip structure used for aluminum alloy window edge sealing includes the following steps: Align the base of the sealing strip structure with the mounting groove of the aluminum alloy window. The T-shaped base plate of the base enters the mounting groove first, serving as a preliminary positioning and guide.

[0017] Continuous pressure is applied to gradually insert the base into the mounting groove. During this process, the necking section of the base acts as a transition, allowing the upper and lower locking hooks to smoothly enter the mounting groove. The upper and lower locking hooks extend away from the cavity. As the base is inserted, the tips of the upper and lower hooks are pressed against the inner wall of the mounting groove, resulting in slight elastic deformation. Once fully inserted into the mounting groove, the upper and lower locking hooks return to their original shape and are locked in their respective positions within the mounting groove, preventing the sealing structure from detaching and achieving initial fixation of the sealing structure on the aluminum alloy window.

[0018] Once the base is fixed, the pressure-bearing backplate of the cavity connects to the necked-out portion of the base, at which point the cavity is in its natural state. During the use of aluminum alloy windows, when subjected to external forces (such as the pressure when the window is closed), the pressure-bearing backplate will bear the pressure. Due to the presence of the hollow compression cavity, the cavity will undergo elastic deformation. The cross-section of the hollow compression cavity is teardrop-shaped, with its curved portion corresponding to the elastic arc surface and its straight portion corresponding to the pressure-bearing backplate. Furthermore, the wall thickness of the elastic arc surface is less than the wall thickness of the pressure-bearing backplate, making it easier for the elastic arc surface to undergo elastic deformation, thus better adapting to changes in external forces and ensuring a good seal.

[0019] The sealing part is fixedly connected to the side of the cavity part away from the base part. The main sealing strip has a blade-like structure, extending upwards at an acute angle away from the cavity part from the upper part of its self-elastic arc surface. After installation, the main sealing strip will contact the corresponding sealing surface of the aluminum alloy window. Its free end away from the elastic arc surface forms a smoothly transitioned tip, which can better fit the sealing surface and reduce leakage. The secondary sealing rib has a rib-like structure, located in the middle of its self-elastic arc surface and below the main sealing strip, extending outwards away from the cavity part and contacting the other sealing surface of the aluminum alloy window to form a double seal. At the same time, the lower surface of the main sealing strip, the upper surface of the secondary sealing rib, and the elastic arc surface together form an open sealing gap cavity. This sealing gap cavity can buffer pressure changes to a certain extent and further enhance the sealing effect.

[0020] Compared with the prior art, the present invention provides a sealing strip structure for aluminum alloy window edge sealing, which has the following beneficial effects: 1. This invention, by setting the base portion including a necked portion, an upper locking hook, and a lower locking hook, with the tips of the upper and lower locking hooks facing the base portion, achieves a tight lock between the sealing strip structure body and the mounting groove for aluminum alloy window edge sealing. This greatly improves the installation firmness of the sealing strip structure for aluminum alloy window edge sealing and effectively prevents it from loosening or falling off during use.

[0021] 2. This invention, by setting a hollow compression cavity with a teardrop-shaped cross-section, wherein the wall thickness of the elastic arc surface is less than the wall thickness of the pressure-bearing back plate, and a sealing part in which the main sealing strip structure for aluminum alloy window edging and the secondary sealing rib work together, achieves stable deformation of the cavity under external pressure and provides efficient buffering and rebound force. The main and secondary sealing strip structures for aluminum alloy window edging can flexibly deform according to the degree of compression and provide multiple sealing contact surfaces, thereby significantly improving the reliability of the seal and the adaptability to external stress, and extending the service life of the sealing strip structure used for aluminum alloy window edging.

[0022] 3. This invention simplifies the structure through one-piece molding, avoiding the complexity of assembling multiple parts. Furthermore, structural optimization of each part ensures ease of installation. For example, the barbed structure of the base can be firmly fixed by simply pressing it in, thereby reducing production costs and installation complexity, and facilitating large-scale production and rapid on-site installation and maintenance. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the installation state of the present invention; Figure 3 This is a schematic diagram of the compression state of the present invention; Figure 4 This is a partially enlarged schematic diagram of the present invention; Figure 5 This is a close-up schematic diagram of the base portion of the present invention being installed; Figure 6 This is a partially enlarged schematic diagram of the sealing part of the present invention; Figure 7 This is a schematic diagram of the connection structure between the base portion and the cavity portion of the present invention.

[0024] Component numbering list in the diagram: 11. Mounting groove; 2. Sealing strip structure body for aluminum alloy window edging; 3. Base; 31. T-shaped base plate; 32. Neck section; 33. Upper locking hook; 34. Upper hook tip; 35. Lower locking hook; 36. Lower hook tip; 4. Cavity; 41. Hollow compression cavity; 42. Pressure-bearing back plate; 43. Elastic arc surface; 5. Sealing section; 51. Main sealing strip structure for aluminum alloy window edging; 52. Secondary sealing rib; 54. Tip of the main sealing strip structure for aluminum alloy window edging; 55. Sealing gap cavity. Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] like Figures 1 to 7 As shown, the present invention provides a sealing strip structure for aluminum alloy window edge sealing, comprising an integrally formed sealing strip structure body 2 for aluminum alloy window edge sealing. The sealing strip structure body 2 has a constant cross-section along its length, meaning it maintains the same cross-sectional shape throughout its length, facilitating continuous production and installation. This cross-section includes the following main parts: a base portion 3, a cavity portion 4, and a sealing portion 5.

[0027] The base portion 3 is used to fix the sealing strip structure body 2, which is used for sealing the edge of aluminum alloy windows, into the mounting groove 11. For example... Figure 2 , 3 As shown in Figure 5, the base portion 3 includes a necked-down portion 32, which is a relatively narrow section in the middle of the base portion 3. The pressure-bearing back plate 42 is connected to this necked-down portion 32, ensuring the structural stability of the cavity portion 4 and the base portion 3. The base portion 3 also includes upper locking hooks 33 and lower locking hooks 35 extending from the upper and lower sides of the necked-down portion 32, respectively. These hook structures are crucial for ensuring the secure fixing of the sealing strip structure used for aluminum alloy window edge sealing. Figure 5As shown, both the upper locking hook 33 and the lower locking hook 35 extend away from the cavity portion 4, and each has an upper hook tip 34 and a lower hook tip 36 facing the base portion 3, respectively. This design allows the hook tips to firmly "bite" the inner wall of the mounting groove 11 after insertion, thus providing strong pull-out resistance and effectively preventing the sealing strip structure used for aluminum alloy window edge sealing from falling off. During installation, when the base portion 3 is pushed into the mounting groove 11, the upper locking hook 33 and the lower locking hook 35 will deform slightly inward. Once they pass through the entrance of the mounting groove 11, they will return to their original shape due to the elasticity of the material, allowing the hook tips 34 and 36 to embed or lock into the inner wall of the mounting groove 11, achieving a self-locking function. The base portion 3 also includes a T-shaped base plate 31, which is fixedly connected to the end of the necked portion 32 away from the cavity portion 4. The T-shaped base plate 31 increases the contact area between the base portion 3 and the bottom of the mounting groove 11, further enhancing the stability of the installation and enabling it to withstand pressure from the sealing direction.

[0028] The cavity part 4 is fixedly connected to one side of the base part 3, and a hollow compression cavity 41 is provided inside it. Figure 1 , 4 As shown in Figure 7, the wall of the cavity 4 includes a pressure-bearing back plate 42 connected to the base 3 and an elastic arc surface 43 connected to the sealing part 5. The pressure-bearing back plate 42, as a structural part connecting the cavity 4 and the base 3, provides solid support. The cross-section of the hollow compression cavity 41 is preferably teardrop-shaped, such as... Figure 1 As shown, the arc-shaped portion of the teardrop-shaped cross-section corresponds to the elastic arc surface 43, and the flat portion corresponds to the pressure-bearing back plate 42. This teardrop-shaped structure allows the cavity to elastically deform in a predetermined manner when subjected to external pressure, thereby providing effective buffering and rebound force. In a preferred embodiment, the wall thickness of the elastic arc surface 43 is less than the wall thickness of the pressure-bearing back plate 42, which means that the elastic arc surface 43 is relatively thinner and is more prone to deformation when compressed, thereby improving the elasticity and response speed of the entire cavity 4 and better adapting to external pressure. When an external object (such as a door, window, etc.) presses against the sealing part 5, the pressure is first transmitted to the elastic arc surface 43, causing the hollow compression cavity 41 to be compressed, thereby providing sealing pressure and buffering effect.

[0029] The sealing part 5 is fixedly connected to the side of the cavity part 4 away from the base part 3. For example... Figure 1 , 6As shown, the sealing part 5 includes a primary sealing strip structure 51 for sealing the aluminum alloy window edge extending from the self-elastic curved surface 43, and a secondary sealing rib 52 disposed below the primary sealing strip structure 51. The primary sealing strip structure 51 for sealing the aluminum alloy window edge is a blade-shaped structure, with the upper part of the self-elastic curved surface 43 extending upward at an acute angle away from the cavity part 4. This inclined blade-shaped structure allows the primary sealing strip structure 51 for sealing the aluminum alloy window edge to form a tight contact line when it contacts the sealed surface, providing an efficient seal. The free end of the primary sealing strip structure 51 for sealing the aluminum alloy window edge away from the elastic curved surface 43 forms a smoothly transitioned tip 54, which helps reduce friction and extend service life. The secondary sealing rib 52 is a rib-shaped structure located in the middle of the self-elastic arc surface 43 and below the primary sealing strip structure 51 used for sealing the aluminum alloy window edge, extending away from the cavity portion 4. The secondary sealing rib 52 and the primary sealing strip structure 51 together form multiple sealing lines, increasing the reliability of the seal. An open sealing gap cavity 55 is formed between the lower surface of the primary sealing strip structure 51, the upper surface of the secondary sealing rib 52, and the elastic arc surface 43. This sealing gap cavity 55 provides deformation space for the primary sealing strip structure 51 and the secondary sealing rib 52 when the sealing portion 5 is compressed, and helps to form an additional airtight or liquid-tight barrier under certain conditions.

[0030] In operation, the sealing strip structure for aluminum alloy window edge sealing of the present invention first securely installs the sealing strip structure body 2 for aluminum alloy window edge sealing into the mounting groove 11 through the barb structure of the base part 3 (upper locking barb 33, lower locking barb 35 and their tips 34, 36). Figure 2 , 5 As shown). When the sealed component (such as a door or window sash) is closed and pressed against the sealing strip structure used for aluminum alloy window sealing (as shown). Figure 3 As shown, pressure first acts on the main sealing strip structure 51 and the secondary sealing rib 52 of the sealing part 5 for sealing the aluminum alloy window edge. Due to the blade-like structure and inclined direction of the main sealing strip structure 51 for sealing the aluminum alloy window edge, and the supporting role of the secondary sealing rib 52, they will make close contact with the sealed surface, providing the first and second sealing lines. At the same time, the pressure is transmitted to the elastic arc surface 43, causing the hollow compression cavity 41 to be compressed, the elastic arc surface 43 to deform inward, and the thicker pressure-bearing back plate 42 to provide stable support. This compression not only provides a buffering and shock absorption effect, but also allows the sealing part 5 to better fit the sealed surface, further enhancing the sealing performance. When the pressure is released, the cavity part 4 and the sealing part 5 rely on the elasticity of the material to return to their original shape. The entire one-piece molded structure ensures the coordinated work between the various components, thereby providing excellent sealing, buffering and fixing performance.

[0031] Regarding the cavity section 4, the design of the teardrop-shaped hollow compression cavity 41 optimizes its elastic response under different compression levels. When the external pressure is low, the cavity section 4, composed of the elastic arc surface 43 and the pressure-bearing back plate 42, provides gentle buffering, preventing wear or abnormal noise caused by minor vibrations. When the external pressure increases, since the wall thickness of the elastic arc surface 43 is less than that of the pressure-bearing back plate 42, the elastic arc surface 43 first undergoes significant deformation, causing the teardrop-shaped cavity to gradually flatten, providing a progressive damping effect. This non-linear compression characteristic allows the sealing strip structure used for aluminum alloy window edging to maintain good resilience and sealing performance under high pressure, and it will not be easily compacted and lose its elasticity, thus significantly extending the service life of the sealing strip structure used for aluminum alloy window edging. It is especially suitable for equipment that needs to withstand cyclic high-pressure loads, such as the doors of heavy machinery or the sealing of industrial furnaces.

[0032] Regarding the sealing section 5, the blade-like structure and upwardly inclined angle of the primary sealing strip structure 51 for aluminum alloy window edge sealing are precisely designed to ensure that it forms an ideal line contact or narrow band contact when compressed, maximizing contact pressure and thus achieving efficient airtight or liquid-tight sealing. The rib-like structure of the secondary sealing rib 52 provides additional support for the primary sealing strip structure 51 for aluminum alloy window edge sealing and, in some cases, forms a second independent seal. Especially when the primary sealing strip structure 51 for aluminum alloy window edge sealing partially fails for some reason, the secondary sealing rib 52 can still provide a certain degree of sealing protection, enhancing the redundancy and reliability of the overall sealing system. The design of the sealing gap cavity 55 not only provides space for the deformation of the primary sealing strip structure 51 and the secondary sealing rib 52 for aluminum alloy window edge sealing, but can also act as a drainage channel or air buffer layer in specific applications, further optimizing the sealing effect. For example, in door and window applications, it can help guide rainwater or condensate out, preventing accumulation. The smooth transition of the tip 54 of the sealing strip structure used for aluminum alloy window sealing minimizes wear during contact, especially when the seal needs to come into contact with frequently opened and closed components, which can significantly extend the effective life of the sealing strip structure used for aluminum alloy window sealing.

Claims

1. A sealing strip structure for sealing aluminum alloy windows, comprising an integrally formed sealing strip structure body (2) for sealing aluminum alloy windows, characterized in that, The sealing strip structure body (2) for sealing aluminum alloy windows has a constant cross-section along its length, the cross-section comprising: The base (3) is used to fix the sealing strip structure body (2) for sealing aluminum alloy windows into the mounting groove (11); The cavity part (4) is fixedly connected to one side of the base part (3), and a hollow compression cavity (41) is provided inside it; and The sealing part (5) is fixedly connected to the side of the cavity part (4) away from the base part (3); The cavity (4) includes a pressure-bearing back plate (42) connected to the base (3) and an elastic arc surface (43) connected to the sealing part (5). The sealing part (5) includes a main sealing strip structure (51) for sealing aluminum alloy windows extending from the elastic arc surface (43) and a secondary sealing rib (52) disposed below the main sealing strip structure (51) for sealing aluminum alloy windows.

2. The sealing strip structure for sealing aluminum alloy windows according to claim 1, characterized in that, The base portion (3) includes a necked portion (32), and the pressure-bearing back plate (42) is connected to the necked portion (32); the base portion (3) also includes an upper locking hook (33) and a lower locking hook (35) extending from the upper and lower sides of the necked portion (32).

3. The sealing strip structure for sealing aluminum alloy windows according to claim 2, characterized in that, The upper locking barb (33) and the lower locking barb (35) both extend in a direction away from the cavity portion (4) and have an upper barb tip (34) and a lower barb tip (36) respectively facing the base portion (3).

4. The sealing strip structure for aluminum alloy window edge sealing according to claim 2, characterized in that, The base portion (3) also includes a T-shaped base plate (31), which is fixedly connected to one end of the necked portion (32) away from the cavity portion (4).

5. The sealing strip structure for sealing aluminum alloy windows according to claim 1, characterized in that, The cross-section of the hollow compression cavity (41) is teardrop-shaped, the arc-shaped part of the teardrop-shaped cross-section corresponds to the elastic arc surface (43), and the straight part of the teardrop-shaped cross-section corresponds to the pressure-bearing back plate (42).

6. The sealing strip structure for sealing aluminum alloy windows according to claim 5, characterized in that, The wall thickness of the elastic arc surface (43) is less than the wall thickness of the pressure-bearing back plate (42).

7. The sealing strip structure for sealing aluminum alloy windows according to claim 1, characterized in that, The sealing strip structure (51) for sealing aluminum alloy windows is a blade-shaped structure. It extends upward at an acute angle away from the cavity (4) from the upper part of the elastic arc surface (43). The free end of the sealing strip structure (51) for sealing aluminum alloy windows away from the elastic arc surface (43) forms a smoothly transitioned tip (54) of the sealing strip structure for sealing aluminum alloy windows.

8. The sealing strip structure for sealing aluminum alloy windows according to claim 1, characterized in that, The secondary sealing rib (52) is a rib-shaped structure located in the middle of the elastic arc surface (43) and below the main sealing strip structure (51) used for sealing aluminum alloy windows, extending away from the cavity part (4).

9. The sealing strip structure for sealing aluminum alloy windows according to claim 1, characterized in that, An open sealing gap cavity (55) is formed between the lower surface of the main sealing strip structure (51) used for sealing aluminum alloy windows, the upper surface of the secondary sealing rib (52), and the elastic arc surface (43).

10. The installation method of the sealing strip structure for aluminum alloy window edge sealing according to claims 1-9, characterized in that, Includes the following steps: Align the base (3) of the seal structure body (2) with the mounting groove (11) of the aluminum alloy window; the T-shaped base plate (31) of the base (3) first enters the mounting groove (11) to play a preliminary positioning and guiding role; Apply continuous pressure to gradually insert the base part (3) into the mounting groove (11); during this process, the necked part (32) of the base part (3) plays a transition role, allowing the upper locking hook (33) and the lower locking hook (35) to smoothly enter the mounting groove (11); the upper locking hook (33) and the lower locking hook (35) extend in the direction away from the cavity part (4). As the base part (3) is inserted, the tips of the upper hook (34) and the tips of the lower hook (36) will be squeezed against the inner wall of the mounting groove (11) and undergo slight elastic deformation. After they are fully inserted into the mounting groove (11), the upper locking hook (33) and the lower locking hook (35) return to their original state and are respectively locked in the corresponding positions in the mounting groove (11) to prevent the sealing structure from coming out of the mounting groove (11) and achieve the initial fixation of the sealing structure on the aluminum alloy window; After the base part (3) is fixed, the pressure-bearing back plate (42) of the cavity part (4) is connected to the necking part (32) of the base part (3), and the cavity part (4) is in a natural state. During the use of the aluminum alloy window, when it is subjected to external force (such as the pressure when the window is closed), the pressure-bearing back plate (42) will bear the pressure. Due to the existence of the hollow compression cavity (41), the cavity part (4) will undergo elastic deformation. The cross section of the hollow compression cavity (41) is teardrop-shaped. Its arc part corresponds to the elastic arc surface (43), and the straight part corresponds to the pressure-bearing back plate (42). The wall thickness of the elastic arc surface (43) is less than the wall thickness of the pressure-bearing back plate (42), which makes the elastic arc surface (43) more likely to undergo elastic deformation, thereby better adapting to changes in external force and ensuring the sealing effect. The sealing part (5) is fixedly connected to the cavity part (4) on the side away from the base part (3); the main sealing strip (51) has a blade-like structure, extending upward at an acute angle away from the cavity part (43) from the upper part of the self-elastic arc surface (43). After installation, the main sealing strip (51) will contact the corresponding sealing surface of the aluminum alloy window. Its free end away from the elastic arc surface (43) forms a smoothly transitioned main sealing strip tip (54), which can better fit with the sealing surface and reduce leakage; the secondary sealing rib (5 2) It is a rib-shaped structure, located in the middle of the self-elastic arc surface (43) and below the main sealing strip (51), extending outward in a direction away from the cavity part (4) and contacting the other sealing surface of the aluminum alloy window to form a double seal; at the same time, between the lower surface of the main sealing strip (51), the upper surface of the secondary sealing rib (52) and the elastic arc surface (43), an open sealing gap cavity (55) is formed. This sealing gap cavity (55) can buffer pressure changes to a certain extent and further enhance the sealing effect.

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