Special-shaped foam sealing rubber strip

Abstract

This utility model discloses an irregularly shaped foam sealing strip, including a foam substrate. A double-lip structure is installed on the top of the foam substrate, and a connecting structure is installed on the bottom of the foam substrate. The cross-section of the foam layer is trapezoidal, narrower at the top and wider at the bottom. The foam substrate comprises a high-density foam layer, a medium-density foam layer, and a low-density foam layer, which are connected sequentially from top to bottom. In this utility model, the foam substrate adopts a three-layer density gradient structure, providing progressive compression characteristics while ensuring overall strength, enabling it to adapt to various uneven surfaces. The top double-lip structure adopts a composite design of a main lip sealing strip and an auxiliary lip sealing strip. The main lip provides high-strength support and sealing, while the auxiliary lip elastically fills minute gaps. The height difference between the two creates a pressure gradient, ensuring a dynamic sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of sealing strip technology, and more specifically, to a shaped foam sealing strip. Background Technology

[0002] In industrial production, building decoration, and equipment manufacturing, sealing strips are key components that ensure waterproofing, dustproofing, sound insulation, and vibration damping. Traditional sealing strips are mostly made of single-density foam or rubber materials. Although they have a certain degree of compressibility and resilience, they are prone to material fatigue and incomplete sealing under long-term pressure or in environments with large temperature variations.

[0003] Furthermore, conventional sealing strips typically employ a single sealing lip structure, making them poorly adaptable to irregular contact surfaces. In terms of installation, existing products mostly use a single connection method of adhesive bonding or mechanical fixation, which is not only inefficient but also difficult to adapt to different surface materials. For example, on metal surfaces, traditional adhesive methods may cause the adhesive layer to fail due to vibration or temperature changes; while on non-metallic surfaces, quick installation methods such as magnetic attraction are not available. Simultaneously, when facing curved or uneven installation surfaces, ordinary sealing strips often suffer from localized stress concentration, affecting the sealing effect and shortening their service life. Utility Model Content

[0004] To address the problems existing in the prior art, the purpose of this utility model is to provide an irregularly shaped foam sealing strip to solve the problems in the background technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution;

[0006] A shaped foam sealing strip includes a foam substrate, a double-lip structure installed on the top of the foam substrate, a connecting structure installed on the bottom of the foam substrate, and the cross-section of the foam layer is a trapezoidal shape that is narrower at the top and wider at the bottom.

[0007] The foam matrix includes a high-density foam layer, a medium-density foam layer and a low-density foam layer, which are connected sequentially from top to bottom.

[0008] The double-lip structure includes a main lip sealing strip and an auxiliary lip sealing strip. Both the main lip sealing strip and the auxiliary lip sealing strip are installed on the top of the foam matrix. The auxiliary lip sealing strip is located on the back of the main lip sealing strip and is lower in height than the main lip sealing strip. The hardness of the main lip sealing strip is higher than that of the auxiliary lip sealing strip. The main lip sealing strip is trapezoidal and is composed of a closed-cell polyurethane foam matrix and a thick aramid fiber reinforcing layer. The auxiliary lip sealing strip is semi-circular and is composed of open-cell silicone foam.

[0009] The connecting structure includes a bottom groove, which is formed at the bottom of the foam substrate. A magnetic strip is movably connected to the inner wall of the bottom groove. A metal sheet is magnetically connected to the bottom of the magnetic strip, and an adhesive strip is connected to the bottom of the metal sheet.

[0010] As a further description of the above technical solution: the top of the foam substrate is provided with equally spaced guide grooves, which are located between the main lip sealing strip and the auxiliary lip sealing strip.

[0011] As a further description of the above technical solution: the surface of the auxiliary lip sealing strip is coated with a nano-hydrophobic coating.

[0012] As a further description of the above technical solution: two limiting grooves are formed on the inner wall of the bottom groove, and the magnetic strip is slidably connected to the inner wall of the limiting groove.

[0013] As a further description of the above technical solution: the magnetic strip has a segmented structure, and the segmented magnetic strips are all located inside the bottom groove.

[0014] Compared with existing technologies, the advantages of this utility model are:

[0015] In this invention, the foam substrate adopts a three-layer density gradient structure, which provides progressive compression characteristics while ensuring overall strength, enabling it to adapt to various uneven surfaces. The top double-lip structure adopts a composite design of a main lip sealing strip and an auxiliary lip sealing strip. The main lip provides high-strength support and sealing, while the auxiliary lip fills the tiny gaps with elasticity. The height difference between the two forms a pressure gradient to ensure dynamic sealing effect. The equidistant guide grooves between the main and auxiliary lips can effectively guide liquid out and prevent liquid accumulation from causing seal failure.

[0016] The bottom connection structure adopts a bottom groove combined with a segmented magnetic strip design, which can achieve quick installation through magnetic attraction and can also be fixed on non-metallic surfaces with adhesive backing. The segmented magnetic strip can adapt to curved surface installation, ensuring uniform and stable adsorption. The overall trapezoidal cross section, which is narrow at the top and wide at the bottom, generates radial expansion force when under pressure, further enhancing the sealing fit and maintaining a long-lasting and reliable sealing performance under various complex working conditions. Attached Figure Description

[0017] Fig. 1 This is a three-dimensional structural diagram of the present invention;

[0018] Fig. 2 This is a three-dimensional structural diagram of the foam substrate of this utility model;

[0019] Fig. 3 This is a schematic diagram of the cross-sectional structure of the bottom groove of this utility model.

[0020] Explanation of the labels in the diagram:

[0021] 1. Foam substrate; 101. High-density foam layer; 102. Medium-density foam layer; 103. Low-density foam layer; 2. Double-lip structure; 201. Main lip sealing strip; 202. Auxiliary lip sealing strip; 3. Connecting structure; 301. Bottom groove; 302. Magnetic strip; 303. Metal sheet; 304. Adhesive strip; 4. Guide groove; 5. Nano-hydrophobic coating; 6. Limiting groove. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] Please see Figs. 1-3 In this utility model, an irregularly shaped foam sealing strip includes a foam substrate 1, a double-lip structure 2 installed on the top of the foam substrate 1, and a connecting structure 3 installed on the bottom of the foam substrate 1. The cross-section of the foam layer is a trapezoidal shape that is narrower at the top and wider at the bottom. The foam substrate 1 includes a high-density foam layer 101, a medium-density foam layer 102, and a low-density foam layer 103, which are connected sequentially from top to bottom.

[0024] The double-lip structure 2 includes a main lip sealing strip 201 and an auxiliary lip sealing strip 202. Both the main lip sealing strip 201 and the auxiliary lip sealing strip 202 are installed on the top of the foam matrix 1. The auxiliary lip sealing strip 202 is located on the back of the main lip sealing strip 201 and is lower in height than the main lip sealing strip 201. The hardness of the main lip sealing strip 201 is higher than that of the auxiliary lip sealing strip 202. The main lip sealing strip 201 is trapezoidal and is composed of a closed-cell polyurethane foam matrix and a thick aramid fiber reinforcement layer. The auxiliary lip sealing strip 202 is semi-circular and is composed of open-cell silicone foam.

[0025] The connecting structure 3 includes a bottom groove 301, which is formed at the bottom of the foam substrate 1. A magnetic strip 302 is movably connected to the inner wall of the bottom groove 301. A metal sheet 303 is magnetically connected to the bottom of the magnetic strip 302. An adhesive strip 304 is connected to the bottom of the metal sheet 303. Two limiting grooves 6 are formed on the inner wall of the bottom groove 301. The magnetic strip 302 is slidably connected to the inner wall of the limiting groove 6.

[0026] In this utility model, when sealing installation is required, the operator first selects a suitable connection method according to the material characteristics of the installation surface. If the installation surface is made of metal, the metal sheet 303 and the adhesive strip 304 can be directly removed from the bottom of the magnetic strip 302, so that the foam substrate 1 can be directly magnetically connected to the metal surface through the magnetic strip 302. At this time, the bottom of the foam substrate 1 is in close contact with the installation surface. Under the action of magnetic attraction, the magnetic strip 302 slides along the limiting groove 6 to the bottom of the bottom groove 301 to achieve stable adsorption and fixation. This magnetic connection method facilitates quick installation and disassembly. At the same time, the bottom groove 301 structure ensures the positioning accuracy of the magnetic strip 302 and avoids installation offset.

[0027] If the mounting surface is non-metallic, the operator needs to peel off the protective layer of the adhesive strip 304 and directly stick the metal sheet 303 with adhesive backing to the mounting surface. During the pasting process, the bottom groove 301 limits the magnetic strip 302 to ensure that the foam substrate 1 and the mounting surface remain parallel and in contact, thus completing the adhesive bonding. Both connection methods use the bottom groove 301 of the connection structure 3 to cooperate with the limiting groove 6 to ensure the stability of the magnetic strip 302 during the installation process and avoid positional displacement due to external forces.

[0028] After installation, the main lip sealing strip 201 and the auxiliary lip sealing strip 202 of the double-lip structure 2 work together to form a double sealing barrier. The trapezoidal main lip sealing strip 201 with higher hardness is pressed against the contact surface first, and its closed-cell polyurethane foam matrix and aramid fiber reinforcement layer provide high-strength support. The semi-circular auxiliary lip sealing strip 202 fills the tiny gap after the main lip sealing strip 201 is pressed by the elastic deformation of the open-cell silicone foam. The height difference design between the two ensures the distribution of sealing pressure gradient and achieves dynamic sealing effect.

[0029] The three-layer density structure of the foam matrix 1, consisting of a high-density foam layer 101, a medium-density foam layer 102, and a low-density foam layer 103, forms a progressive compression characteristic from top to bottom. The high-density layer maintains structural rigidity, the medium-density layer buffers external impacts, and the low-density layer adapts to surface unevenness. When compressed, the trapezoidal cross-section, which is narrow at the top and wide at the bottom, generates radial expansion force, further enhancing the fit of the sealing contact surface. This structure is particularly suitable for working environments with vibration or temperature difference deformation, and maintains durable sealing performance through material layering response.

[0030] Please see Fig. 2 The foam substrate 1 has equidistantly arranged guide grooves 4 on its top, which are located between the main lip sealing strip 201 and the auxiliary lip sealing strip 202.

[0031] In this invention, the structure can form a micro-airflow channel on the sealing contact surface. The equidistant distribution of the guide grooves 4 ensures uniform fluid diffusion, while reducing the air resistance effect when the foam is under pressure, and improving the dynamic sealing adaptability.

[0032] Please see Fig. 1 Among them, the surface of the auxiliary lip sealing strip 202 is coated with a nano-hydrophobic coating 5.

[0033] In this invention, the coating significantly improves waterproof performance by reducing surface energy, allowing droplets to slide off quickly upon contact. Compared to traditional sealing strips, the introduction of the nano-coating can extend the service life of the auxiliary lip in humid environments and reduce dirt adhesion, making it particularly suitable for outdoor or high-humidity conditions.

[0034] Please see Fig. 2 Among them, the magnetic strip 302 has a segmented structure, and the segmented magnetic strip 302 is located inside the bottom groove 301.

[0035] In this invention, the segmented magnetic strip 302 can be adapted to curved mounting surfaces. Local magnetic force adjustment avoids uneven adsorption caused by surface unevenness. In addition, when subjected to external impact, this design can absorb energy through the micro-displacement of a single magnetic strip 302, reducing the risk of overall desorption, and at the same time, it facilitates the individual replacement of damaged sections.

[0036] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A shaped foam sealing strip, comprising a foam substrate (1), characterized in that: The top of the foam substrate (1) is equipped with a double-lip structure (2), and the bottom of the foam substrate (1) is equipped with a connecting structure (3). The cross-section of the foam layer is a trapezoidal shape that is narrow at the top and wide at the bottom. The foam substrate (1) includes a high-density foam layer (101), a medium-density foam layer (102) and a low-density foam layer (103), which are connected sequentially from top to bottom. The double-lip structure (2) includes a main lip sealing strip (201) and an auxiliary lip sealing strip (202). Both the main lip sealing strip (201) and the auxiliary lip sealing strip (202) are installed on the top of the foam matrix (1). The auxiliary lip sealing strip (202) is located on the back of the main lip sealing strip (201) and is lower in height than the main lip sealing strip (201). The hardness of the main lip sealing strip (201) is higher than that of the auxiliary lip sealing strip (202). The main lip sealing strip (201) is trapezoidal in shape and is composed of a closed-cell polyurethane foam matrix and a thick aramid fiber reinforcing layer. The auxiliary lip sealing strip (202) is semi-circular and is composed of open-cell silicone foam. The connecting structure (3) includes a bottom groove (301), which is located at the bottom of the foam substrate (1). A magnetic strip (302) is movably connected to the inner wall of the bottom groove (301). A metal sheet (303) is magnetically connected to the bottom of the magnetic strip (302), and an adhesive strip (304) is connected to the bottom of the metal sheet (303).

2. The irregularly shaped foam sealing strip according to claim 1, characterized in that: The top of the foam substrate (1) is provided with equidistantly arranged guide grooves (4), which are located between the main lip sealing strip (201) and the auxiliary lip sealing strip (202).

3. The irregularly shaped foam sealing strip according to claim 1, characterized in that: The surface of the auxiliary lip sealing strip (202) is coated with a nano-hydrophobic coating (5).

4. The irregularly shaped foam sealing strip according to claim 1, characterized in that: Two limiting grooves (6) are provided on the inner wall of the bottom groove (301), and the magnetic strip (302) is slidably connected to the inner wall of the limiting groove (6).

5. The irregularly shaped foam sealing strip according to claim 1, characterized in that: The magnetic strip (302) has a segmented structure, and the segmented magnetic strip (302) is located inside the bottom groove (301).

Images