Automobile flame-retardant rubber sealing strip

Abstract

The utility model relates to the technical field of rubber sealing strips, in particular to an automobile flame-retardant rubber sealing strip which comprises installation feet installed at the bottom of a sealing strip body, an airtight cavity is formed in the sealing strip body and filled with inert gas, and a buffering cavity is formed in the sealing strip body and located above the airtight cavity. And a rubber channel which is sealed in a static state is formed between the airtight cavity and the buffer cavity, rubber supporting plates are symmetrically and obliquely installed on the two sides of the airtight cavity, and an X-shaped rubber strip is installed between the two rubber supporting plates. When the sealing strip body is impacted, the sealing strip body deforms and extrudes inert gas in the airtight cavity, and the compressed inert gas breaks through the rubber channel in a static sealed state and escapes into the buffer cavity, so that the inert gas is prevented from being extruded and expanded to cause leakage, and the inert gas is prevented from leaking until a part of an automobile is smoldered to the airtight cavity. The inert gas inside is released to extinguish the smoldering part, so that fire spreading is avoided.

Description

Technical Field

[0001] This utility model relates to the field of rubber sealing strip technology, and in particular to a flame-retardant rubber sealing strip for automobiles. Background Technology

[0002] For example, Chinese patent CN222097434U discloses a flame-retardant rubber sealing strip for automobiles. The inert gas airbag, flame-retardant filling layer and first flame-retardant layer can be flame-retardant treated. The composite fiber layer can improve the overall flame-retardant performance of the material. This structure can maintain strength and toughness while having good flame-retardant performance. Furthermore, the anti-corrosion layer provides external anti-corrosion treatment, and the wear-resistant layer further improves the external wear resistance, thereby significantly improving the service life of the rubber sealing strip body.

[0003] The aforementioned application involves installing a sealing rubber tube inside the rubber sealing strip and using inert gas inside the tube to retard flames in the event of a fire. However, since the rubber tube is filled with inert gas, it may burst under pressure and leak out when subjected to a large impact. Furthermore, the spring inside the elastic rubber tube may experience fatigue deformation due to long-term vibration and compression, leading to a decrease in the elastic limiting function and affecting the stability of the sealing strip installation. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an automotive flame-retardant rubber sealing strip, which solves the technical problem that when existing sealing strips are impacted, the inert gas inside expands under pressure, causing the rubber tube to rupture and leading to inert gas leakage. This achieves the purpose of setting a guiding cavity inside the sealing strip to disperse pressure and prevent inert gas from expanding and leaking out.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a flame-retardant rubber sealing strip for automobiles, including a mounting foot installed at the bottom of the sealing strip body, a flame-retardant mechanism provided in the sealing strip body, and an airtight cavity opened in the sealing strip body, the airtight cavity being filled with inert gas, a buffer cavity provided in the middle of the sealing strip body and above the airtight cavity, and a rubber channel that is sealed when statically opened between the airtight cavity and the buffer cavity, rubber support plates symmetrically and obliquely installed on both sides of the airtight cavity, an X-shaped rubber strip installed between the two rubber support plates, and a sealing mechanism for strengthening the connection stability of the sealing strip body provided in the mounting foot.

[0006] A further improvement is that the flame-retardant mechanism includes a wear-resistant surface layer, a flame-retardant layer, and a heat-insulating buffer layer arranged sequentially from the outside to the inside on the sealing strip body, and the airtight cavity is opened inside the heat-insulating buffer layer.

[0007] A further improvement is that the wear-resistant surface layer includes a composite silicone rubber layer on the outer side, and a fluororubber coating is provided on the inner side of the composite silicone rubber layer.

[0008] A further improvement is that the flame-retardant layer includes a EPDM rubber blend layer located inside the fluororubber coating, and an amino resin expansion layer is disposed inside the EPDM rubber blend layer.

[0009] A further improvement is that the heat insulation buffer layer includes a ceramic fiber layer located inside the amino resin expansion layer, and a hydrogenated nitrile rubber layer is disposed inside the ceramic fiber layer.

[0010] A further improvement is that the sealing mechanism includes elastic skeletons symmetrically installed inside the mounting feet and in reinforcing grooves close to their outer sides, with a memory spring provided between the two elastic skeletons.

[0011] By employing the above technical solution, this utility model provides an automotive flame-retardant rubber sealing strip, which has at least the following beneficial effects:

[0012] 1. When the sealing strip body is impacted, it deforms and squeezes the inert gas in the airtight cavity. At this time, the compressed inert gas breaks through the rubber channel that is sealed in a static state and escapes into the buffer cavity, thereby preventing the inert gas from being squeezed and expanded, which would lead to leakage. Until the smoldering fire in the car reaches the airtight cavity, the inert gas inside is released and extinguishes the smoldering fire, thereby preventing the fire from spreading.

[0013] 2. This utility model uses a rubber support plate set inside the airtight cavity to form a triangular structure with the side of the airtight cavity, and an X-shaped rubber strip between the two rubber support plates to form multiple triangular structures in the central space of the airtight cavity. Triangles have good compressive and deformation resistance, thereby improving the overall compressive resistance of the sealing strip body.

[0014] 3. This utility model improves the wear resistance and corrosion resistance of the sealing strip body through the internal structure of the flame-retardant mechanism. When it is heated and burned, the internal flame retardant decomposes and absorbs heat, releasing inert gas and water vapor to suppress the spread of fire and block heat, ensuring the dimensional stability and physical properties of the sealing strip body under high temperature conditions.

[0015] 4. This utility model uses a nickel-titanium alloy elastic skeleton with shape memory function to support the corners of the mounting feet, preventing them from shrinking and causing the connection to loosen. The elastic skeleton provides stable support and is easier to install. It also has a certain degree of elasticity, so it can quickly recover after the sealing strip is deformed by impact, thus ensuring the stability of the connection. Combined with the memory spring that expands when heated, it pushes the two sides of the mounting feet firmly against the car mounting groove, thereby further improving the stability of the connection. Attached Figure Description

[0016] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0017] In the attached diagram:

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the internal structure of the sealing strip body of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the sealing strip body of this utility model, viewed independently in cross section.

[0021] Figure 4 This is a cross-sectional schematic diagram of the internal structure of the buffer cavity of this utility model;

[0022] Figure 5 This is a cross-sectional top view of the mounting feet of this utility model.

[0023] In the diagram: 1. Sealing strip body; 2. Mounting feet; 3. Flame-retardant mechanism;

[0024] 31. Wear-resistant surface layer; 311. Composite silicone rubber layer; 312. Fluororubber coating;

[0025] 32. Flame retardant layer; 321. EPDM rubber blend layer; 322. Amino resin expanded layer;

[0026] 33. Thermal insulation buffer layer; 331. Ceramic fiber layer; 332. Hydrogenated nitrile rubber layer;

[0027] 4. Airtight cavity; 5. Buffer cavity; 6. Rubber channel; 7. Rubber support plate; 8. X-shaped rubber strip;

[0028] 9. Sealing mechanism; 91. Elastic frame; 92. Memory spring. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] Based on the existing technology where, upon impact, the inert gas inside the sealing strip expands under pressure, causing the rubber tube to rupture and leading to inert gas leakage, this embodiment provides an automotive flame-retardant rubber sealing strip that incorporates a guiding cavity within the sealing strip to distribute pressure and prevent inert gas expansion and leakage. Please refer to... Figures 1-5 The automotive flame-retardant rubber sealing strip includes mounting feet 2 installed at the bottom of the sealing strip body 1, a flame-retardant mechanism 3 provided inside the sealing strip body 1, and an airtight cavity 4 opened inside the sealing strip body 1, the airtight cavity 4 being filled with inert gas, a buffer cavity 5 provided in the middle of the sealing strip body 1 and above the airtight cavity 4, and a rubber channel 6 that is sealed when static is opened between the airtight cavity 4 and the buffer cavity 5, rubber support plates 7 symmetrically and obliquely installed on both sides of the airtight cavity 4, an X-shaped rubber strip 8 installed between the two rubber support plates 7, and a sealing mechanism 9 provided inside the mounting feet 2 to enhance the connection stability of the sealing strip body 1.

[0032] When the sealing strip body 1 is impacted, it deforms and compresses the inert gas in the airtight cavity 4. At this time, the compressed inert gas breaks through the rubber channel 6, which is sealed in a static state, and escapes into the buffer cavity 5, thereby preventing the inert gas from being compressed and expanded, which would lead to leakage. Until the smoldering of the car reaches the airtight cavity 4, the inert gas inside is released and extinguishes the smoldering area, thus preventing the fire from spreading. The rubber support plate 7 installed in the airtight cavity 4 forms a triangular structure with the side of the airtight cavity 4, and the X-shaped rubber strip 8 between the two rubber support plates 7 forms multiple triangular structures in the middle space of the airtight cavity 4. Triangles have good pressure resistance and deformation resistance, thereby improving the overall pressure resistance of the sealing strip body 1.

[0033] To further improve the overall heat resistance and flame retardancy of the sealing strip body 1, the device is also equipped with a flame retardant mechanism 3. The flame retardant mechanism 3 includes a wear-resistant surface layer 31, a flame retardant layer 32 and a heat insulation buffer layer 33 arranged sequentially from the outside to the inside on the sealing strip body 1, and the airtight cavity 4 is opened inside the heat insulation buffer layer 33.

[0034] The wear-resistant surface layer 31 includes a composite silicone rubber layer 311 on the outer side and a fluororubber coating 312 on the inner side of the composite silicone rubber layer 311. The composite silicone rubber layer 311 has good wear resistance and can effectively resist the impact of sand and gravel and friction of the door, thereby extending the service life of the sealing strip body 1. The fluororubber coating 312 can effectively resist the corrosion of oil and chemicals and is suitable for harsh environments such as engine compartments. The two together can cope with different usage environments.

[0035] The flame-retardant layer 32 includes an EPDM rubber blend layer 321 located inside the fluororubber coating 312. An amino resin expansion layer 322 is disposed inside the EPDM rubber blend layer 321. The EPDM rubber blend layer 321 is composed of EPDM rubber, nitrogen-based synergists and magnesium hydroxide. The nitrogen-based synergists decompose and absorb heat when heated and release inert gases to retard and extinguish fire. In conjunction with magnesium hydroxide, it decomposes and absorbs heat at high temperatures, releasing water vapor to dilute oxygen, thereby effectively inhibiting the spread of fire. The amino resin expansion layer 322 inside it expands after being exposed to fire to form a carbonized layer 30-50 times thick, thereby effectively blocking heat transfer and suppressing the fire.

[0036] The heat insulation buffer layer 33 includes a ceramic fiber layer 331 located inside the amino resin expansion layer 322. A hydrogenated nitrile rubber layer 332 is disposed inside the ceramic fiber layer 331. The ceramic fiber layer 331 has extremely low thermal conductivity, which can effectively prevent the flame heat from spreading outward, ensuring the dimensional stability and physical properties of the sealing strip body 1 under high temperature conditions. Together with the hydrogenated nitrile rubber layer 332, it seals the inert gas in the airtight cavity 4, preventing the inert gas from leaking out, and can buffer the vibration and impact generated by the impact on the sealing strip body 1, protecting the sealed components.

[0037] Example 2

[0038] Because the rubber mounting feet 2 are relatively soft, they will bend and wrinkle during sliding installation, making installation inconvenient. Furthermore, after prolonged use, factors such as thermal expansion and contraction or external impacts can cause the connection to loosen, affecting the sealing effect. Therefore, based on Example 1, if... Figures 1-5 As shown, the device is also equipped with a sealing mechanism 9. The sealing mechanism 9 includes elastic skeletons 91 symmetrically installed inside the mounting feet 2 and close to their outer sides in a reinforcing groove. A memory spring 92 is provided between the two elastic skeletons 91. The elastic skeletons 91, made of nickel-titanium alloy with shape memory function, support the corners of the mounting feet 2 to prevent them from shrinking and causing the connection to loosen. The elastic skeletons 91 provide stable support and are easier to install. They also have a certain degree of elasticity. When the sealing strip body 1 is impacted and deformed, it can quickly recover, thereby ensuring the stability of the connection. In conjunction with the memory springs 92 that expand when heated, they push the two sides of the mounting feet 2 firmly against the car mounting groove, thereby further improving the stability of the connection.

[0039] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flame-retardant rubber sealing strip for automobiles, comprising mounting feet (2) installed at the bottom of the sealing strip body (1), characterized in that: The sealing strip body (1) is provided with a flame-retardant mechanism (3), and the sealing strip body (1) is provided with an airtight cavity (4), which is filled with inert gas. A buffer cavity (5) is provided in the middle of the sealing strip body (1) and above the airtight cavity (4). A rubber channel (6) that is sealed when static is provided between the airtight cavity (4) and the buffer cavity (5). Rubber support plates (7) are symmetrically and obliquely installed on both sides of the airtight cavity (4). An X-shaped rubber strip (8) is installed between the two rubber support plates (7). The mounting foot (2) is provided with a sealing mechanism (9) to enhance the connection stability of the sealing strip body (1).

2. The automotive flame-retardant rubber sealing strip according to claim 1, characterized in that: The flame-retardant mechanism (3) includes a wear-resistant surface layer (31), a flame-retardant layer (32) and a heat-insulating buffer layer (33) arranged sequentially from the outside to the inside on the sealing strip body (1), and the airtight cavity (4) is opened inside the heat-insulating buffer layer (33).

3. The automotive flame-retardant rubber sealing strip according to claim 2, characterized in that: The wear-resistant surface layer (31) includes a composite silicone rubber layer (311) on the outer side, and a fluororubber coating (312) is provided on the inner side of the composite silicone rubber layer (311).

4. The automotive flame-retardant rubber sealing strip according to claim 3, characterized in that: The flame retardant layer (32) includes an EPDM rubber blend layer (321) located inside the fluororubber coating (312), and an amino resin expansion layer (322) is provided inside the EPDM rubber blend layer (321).

5. The automotive flame-retardant rubber sealing strip according to claim 4, characterized in that: The heat insulation buffer layer (33) includes a ceramic fiber layer (331) located inside the amino resin expansion layer (322), and a hydrogenated nitrile rubber layer (332) is provided inside the ceramic fiber layer (331).

6. The automotive flame-retardant rubber sealing strip according to claim 1, characterized in that: The sealing mechanism (9) includes elastic skeletons (91) symmetrically installed inside the mounting foot (2) and close to its outer side in the reinforcing groove, and a memory spring (92) is provided between the two elastic skeletons (91).

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