Multi-layer composite sealing structure

Abstract

The utility model discloses a multi-layer composite type sealing structure which comprises a corrosion-resistant layer, an elastic buffer layer and a rigid supporting layer which are sequentially arranged in a stacked mode from outside to inside, and the outer surface of the corrosion-resistant layer is provided with hydrophobic textures. An annular airtight cavity is formed between the elastic buffer layer and the rigid supporting layer and filled with inert gas. The layers are dynamically connected through at least two sets of elastic connecting pieces, and the two ends of each elastic connecting piece are embedded into the grooves of the adjacent layers respectively. The inner side of the rigid supporting layer is provided with a dovetail groove structure used for being fixedly connected with an equipment body in a clamped mode. Therefore, three layers of polytetrafluoroethylene, silicone rubber and carbon fiber compounding and aluminum alloy are coordinated, erosion and deformation are prevented, stability is guaranteed, complex working conditions are dealt with, nitrogen with 1.2-1.5 times of atmospheric pressure is filled into the airtight cavity, airtightness can be maintained emergently, the dovetail groove and the spring piece are connected, assembly is simplified, the overall service life is prolonged by more than 30% through gradient materials, and cost is reduced and efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of protective equipment, and in particular to a multi-layer composite sealing structure. Background Technology

[0002] In complex and ever-changing extreme environments, the sealing structure, as a core component of high-reliability protective equipment, directly affects personnel safety and equipment operational stability. Existing sealing structures mostly employ single-layer designs (such as rubber rings and silicone gaskets), which expose the following technical bottlenecks when facing harsh operating conditions:

[0003] 1. Limited environmental adaptability: Single-layer materials are prone to aging, deformation or cracking under long-term exposure to extreme temperatures, high pressures or corrosive media, which increases the risk of seal failure.

[0004] 2. Insufficient redundancy protection: The single structure lacks a backup protective layer design, and local damage may cause a precipitous drop in the overall sealing performance;

[0005] 3. Functional compatibility contradiction: Traditional materials have difficulty in meeting the requirements of elastic sealing and corrosion resistance and high strength (such as the corrosion resistance defects of rubber and the insufficient elasticity of metal gaskets).

[0006] 4. Engineering assembly issues: When stacking multi-layer structures, the lack of collaborative design leads to low installation efficiency and poor positioning accuracy, which can easily cause assembly misalignment risks.

[0007] To address the common technical challenges in the industry, there is an urgent need to develop a composite sealing structure that combines high reliability, wide environmental adaptability, and convenient maintenance to meet the sealing and protection requirements under complex working conditions. Utility Model Content

[0008] This utility model aims to at least partially solve one of the technical problems in the related art.

[0009] Therefore, the purpose of this utility model is to propose a multi-layer composite sealing structure, which combines polytetrafluoroethylene, silicone rubber and carbon fiber, and aluminum alloy in a three-layer synergy to prevent corrosion, resist deformation and maintain stability, and cope with complex working conditions. The airtight cavity is filled with nitrogen at 1.2-1.5 times the atmospheric pressure to maintain airtightness in emergencies. The dovetail groove and spring plate connection simplifies assembly. The gradient material increases the overall lifespan by more than 30%, reducing costs and increasing efficiency.

[0010] To achieve the above objectives, this utility model proposes a multi-layer composite sealing structure comprising a corrosion-resistant layer, an elastic buffer layer, and a rigid support layer stacked sequentially from the outside to the inside. The outer surface of the corrosion-resistant layer has a hydrophobic texture. An annular airtight cavity is formed between the elastic buffer layer and the rigid support layer, and the airtight cavity is filled with an inert gas. Each layer is dynamically connected by at least two sets of elastic connectors, with both ends of the elastic connectors embedded in the grooves of adjacent layers. The inner side of the rigid support layer has a dovetail groove structure for engaging and fixing with the equipment body.

[0011] This utility model features a multi-layer composite sealing structure, with polytetrafluoroethylene, silicone rubber and carbon fiber composite, and aluminum alloy working together to prevent corrosion, resist deformation and maintain stability, and cope with complex working conditions. The airtight cavity is filled with nitrogen at 1.2-1.5 times the atmospheric pressure to maintain airtightness in emergencies. The dovetail groove and spring plate connection simplifies assembly, and the gradient material increases the overall lifespan by more than 30%, reducing costs and increasing efficiency.

[0012] In addition, the multi-layer composite sealing structure proposed in the application may also have the following additional technical features:

[0013] Specifically, the corrosion-resistant layer is made of polytetrafluoroethylene (PTFE) with a thickness of 0.5-1 mm, and the hydrophobic texture is a continuous wavy protrusion.

[0014] Specifically, the elastic buffer layer is composed of a silicone rubber matrix and a carbon fiber woven mesh embedded therein, with a thickness of 2-3 mm, and the carbon fiber woven mesh is distributed in a diamond grid pattern.

[0015] Specifically, the rigid support layer is made of aluminum alloy with a thickness of 1.5-2mm, and the dovetail groove structure is evenly distributed circumferentially with a groove depth of 0.8-1.2mm.

[0016] Specifically, the elastic connector is a corrugated stainless steel spring sheet with a wave crest and trough spacing of 2-3 mm and a groove depth of 1.2-1.5 times the thickness of the spring sheet.

[0017] Specifically, the airtight cavity has a semi-circular cross-section and a cavity width of 1-1.5 mm. The inert gas is nitrogen, and the gas pressure is 1.2-1.5 times the standard atmospheric pressure.

[0018] Specifically, the interlayer bonding surfaces of the corrosion-resistant layer, the elastic buffer layer, and the rigid support layer are provided with matching positioning bosses and positioning grooves, and the height of the positioning bosses is 0.3-0.5mm.

[0019] Specifically, it also includes a pressure sensor installed inside the airtight cavity, which is connected to an external alarm device via a wire.

[0020] The advantages of this invention compared to existing technologies are as follows:

[0021] (1) The polytetrafluoroethylene corrosion-resistant layer prevents chemical corrosion, the silicone rubber and carbon fiber composite elastic buffer layer resists deformation and protects the equipment, and the aluminum alloy rigid support layer ensures structural stability. The three layers work together to cope with complex working conditions.

[0022] (2) The airtight cavity is filled with nitrogen at 1.2-1.5 times the standard atmospheric pressure. In case of single-layer failure, it can quickly respond to emergencies, maintain airtightness, and extend the equipment maintenance cycle.

[0023] (3) The dovetail groove is connected to the spring plate. The rigid support layer dovetail groove is easy to engage with the equipment body. The spring plate is embedded in the groove, which simplifies assembly and reduces the risk of misalignment.

[0024] (4) The combination of gradient materials reduces fatigue of single materials. According to the test, the overall life is increased by more than 30% compared with the traditional structure, reducing costs and maintenance.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0027] Figure 1 This is a side view of a multi-layer composite sealing structure according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the elastic connector structure of a multi-layer composite sealing structure according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of a multi-layer composite sealing structure according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the dovetail groove structure of a multi-layer composite sealing structure according to an embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram of the positioning groove and positioning boss structure of a multi-layer composite sealing structure according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the control connection of a multi-layer composite sealing structure according to an embodiment of the present invention.

[0033] As shown in the figure: 1. Corrosion-resistant layer; 2. Elastic buffer layer; 3. Rigid support layer; 4. Airtight cavity; 5. Elastic connector; 6. Pressure sensor; 101. Hydrophobic texture; 102. Positioning boss; 201. Silicone rubber matrix; 202. Carbon fiber woven mesh; 203. Positioning groove; 301. Dovetail groove structure. Detailed Implementation

[0034] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Rather, the embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0035] The multi-layer composite sealing structure of this utility model embodiment will be described below with reference to the accompanying drawings.

[0036] like Figures 1-6 As shown, the multi-layer composite sealing structure of this utility model embodiment includes a corrosion-resistant layer 1, an elastic buffer layer 2, and a rigid support layer 3 stacked sequentially from the outside to the inside.

[0037] It is understood that, in practical applications, the working process of this multi-layer composite sealing structure is as follows: The outermost corrosion-resistant layer 1, with its hydrophobic texture 101 on the outer surface, can effectively resist the erosion of external chemicals and moisture. The hydrophobic texture 101 can reduce the adhesion of liquids to its surface and reduce the risk of corrosion.

[0038] An annular airtight cavity 4 is formed between the elastic buffer layer 2 and the rigid support layer 3. The inert gas filled in the airtight cavity 4 can buffer and maintain air pressure stability when the equipment is subjected to external impacts or pressure changes. When an external impact occurs, the elastic buffer layer 2 first absorbs some of the energy, reducing the impact on the rigid support layer 3, while the inert gas in the airtight cavity 4 can further buffer the impact through air pressure changes, ensuring the stability of the overall structure.

[0039] Each layer is dynamically connected by at least two sets of elastic connectors 5, with each end of the elastic connector 5 precisely embedded in the corresponding groove of the adjacent layer. During equipment use, if the layers experience relative displacement or deformation due to external factors, the elastic connectors 5 can flexibly adapt, ensuring that the layers always maintain an effective connection, while also buffering vibrations and maintaining the integrity of the sealed structure.

[0040] The dovetail groove structure 301 on the inner side of the rigid support layer 3 is used for snap-fit ​​fixing to the equipment body. During installation, align the dovetail groove structure 301 with the corresponding slot on the equipment body and gently push it in to achieve a tight snap-fit. This connection method is not only convenient to install but also stable and reliable, ensuring that the sealing structure is tightly integrated with the equipment body during equipment operation, effectively preventing the sealing structure from loosening and ensuring overall performance.

[0041] In one embodiment of this utility model, such as Figures 1-6 As shown, the corrosion-resistant layer 1 is made of polytetrafluoroethylene (PTFE) with a thickness of 0.5-1mm, and the hydrophobic texture 101 is a continuous wavy protrusion.

[0042] It is understandable that when various chemicals come into contact with the corrosion-resistant layer 1, the molecular structure of polytetrafluoroethylene (PTFE) can prevent the chemicals from reacting with them, thereby protecting the internal elastic buffer layer 2 and rigid support layer 3 from chemical corrosion. For example, in environments where corrosive gases or liquids such as acids and alkalis may be present, the corrosion-resistant layer 1 can remain stable and uncorroded for a long time due to the chemical inertness of PTFE.

[0043] The hydrophobic texture 101 on the outer surface of the corrosion-resistant layer 1 is designed as a continuous wavy protrusion, further enhancing its protective performance. This continuous wavy protrusion hydrophobic texture 101 has unique physical properties. When water comes into contact with this surface, due to the special shape of the texture, the water cannot form a continuous water film on the surface, but exists in the form of water droplets. Under the action of gravity, or under the action of slight vibration or wind, the water droplets can easily roll off the surface, greatly reducing the adhesion time of water on the surface of the corrosion-resistant layer 1. This not only reduces the risk of electrochemical corrosion that may be caused by long-term water adhesion, but also reduces the possibility of microbial growth in a humid environment, further improving the protective capability of the entire sealing structure and providing more durable and reliable protection for the internal structure.

[0044] In one embodiment of this utility model, such as Figures 1-6 As shown, the elastic buffer layer 2 is composed of a silicone rubber matrix 201 and a carbon fiber woven mesh 202 embedded therein, with a thickness of 2-3 mm. The carbon fiber woven mesh 202 is distributed in a diamond grid pattern.

[0045] It is understandable that when external impact forces act on the sealing structure, the silicone rubber matrix 201 first absorbs and disperses the impact energy due to its good flexibility and elasticity. Silicone rubber has a high elastic modulus, enabling it to undergo large deformations without breaking under stress, effectively converting impact energy into its own elastic potential energy.

[0046] At this point, the carbon fiber woven mesh 202 embedded in the silicone rubber matrix 201 plays a crucial role. The carbon fiber woven mesh 202, distributed in a diamond-shaped grid pattern, possesses high strength and high modulus, enhancing the overall structural strength of the silicone rubber matrix 201. Upon impact, the mesh structure of the carbon fiber woven mesh 202 acts like a tight protective net, further dispersing the impact force, preventing excessive deformation of the silicone rubber matrix 201, and avoiding damage due to excessive localized stress. For example, when equipment suffers external collisions or strong vibrations, the silicone rubber matrix 201 and the carbon fiber woven mesh 202 in the elastic buffer layer 2 work together to effectively buffer vibrations and impacts, protecting the internal rigid support layer 3 and the equipment body from damage caused by external impacts, ensuring the equipment can operate normally and maintain good performance under complex working conditions.

[0047] In one embodiment of this utility model, such as Figures 1-6 As shown, the rigid support layer 3 is made of aluminum alloy with a thickness of 1.5-2mm, and the dovetail groove structure 301 is evenly distributed along the circumference with a groove depth of 0.8-1.2mm.

[0048] It is understood that the depth of the dovetail groove structure 301 is designed to be 0.8-1.2mm. This depth ensures a tight connection with the equipment body without compromising the structural strength of the rigid support layer 3 due to excessive depth. During installation, the rigid support layer 3 is brought close to the equipment body, precisely aligning the dovetail groove structure 301 with the pre-set matching protrusions on the equipment body, and then slowly pushed forward circumferentially. Because the dovetail groove structure 301 is evenly distributed circumferentially, it ensures uniform force distribution throughout the process, gradually achieving a tight connection. This evenly distributed design effectively avoids installation misalignment caused by uneven local force distribution, ensuring a stable connection between the entire sealing structure and the equipment body.

[0049] During equipment use, the rigid support layer 3 continuously provides a solid support foundation for the external elastic buffer layer 2 and corrosion-resistant layer 1. When the sealing structure is subjected to complex external pressure, vibration, or impact, the rigid support layer 3, with its high-strength aluminum alloy material, evenly distributes the external force throughout the entire structure, preventing the elastic buffer layer 2 and corrosion-resistant layer 1 from excessive deformation or damage due to insufficient support. Simultaneously, the dovetail groove structure 301, which is tightly engaged with the equipment body, further ensures that the sealing structure and the equipment body maintain a stable connection under various working conditions, preventing loosening due to vibration or external forces. This ensures that the sealing performance of the equipment in complex environments remains unaffected, providing strong support for the normal operation of the equipment in complex environments.

[0050] In one embodiment of this utility model, such as Figures 1-6As shown, the elastic connector 5 is a corrugated stainless steel spring sheet with a wave crest and trough spacing of 2-3 mm, and the depth of the groove is 1.2-1.5 times the thickness of the spring sheet.

[0051] It is understood that the two ends of the elastic connector 5 need to be precisely embedded in the corresponding grooves of the adjacent layers. The depth of these grooves is carefully designed to be 1.2-1.5 times the thickness of the spring sheet. This depth design ensures that the elastic connector 5 is firmly embedded in the groove, preventing it from falling out during use, and also provides sufficient space for the elastic expansion and contraction of the spring sheet within the groove. When the layers experience relative displacement or deformation due to external factors, the corrugated stainless steel spring sheet can flexibly bend and stretch. For example, when the equipment is subjected to vibration or external pressure, causing slight misalignment between the layers, the spring sheet can adapt to this displacement by changing the distance between the crests and troughs, converting the external vibration or pressure into its own elastic potential energy, thereby buffering the relative movement between the layers. At the same time, due to its fit with the groove, it ensures that the connection between the layers is maintained during deformation, avoiding the impact on the performance of the entire sealing structure due to loose connections. This effectively maintains the synergistic work between the corrosion-resistant layer 1, the elastic buffer layer 2, and the rigid support layer 3, providing a reliable guarantee for the stable operation of equipment in complex environments.

[0052] In one embodiment of this utility model, such as Figures 1-6 As shown, the cross-section of the airtight cavity 4 is semi-circular, the cavity width is 1-1.5mm, the inert gas is nitrogen, and the gas pressure is 1.2-1.5 times the standard atmospheric pressure.

[0053] It is understandable that the cross-section of the airtight cavity 4 is semi-circular. While ensuring the stability of the cavity structure, it can more effectively distribute the internal pressure. The semi-circular structure can reduce stress concentration points and lower the risk of damage to the cavity due to uneven pressure. The width of the airtight cavity 4 is precisely controlled between 1-1.5mm. This width ensures sufficient gas storage space while ensuring efficient airtightness within a limited space.

[0054] The airtight cavity 4 is filled with nitrogen, and the pressure is maintained at 1.2-1.5 times the standard atmospheric pressure. Nitrogen, as an inert gas, is chemically stable and does not readily react with other substances, providing a reliable gaseous environment for the sealed structure. In practical operation, when the external environmental pressure changes, the high-pressure nitrogen in the airtight cavity 4 acts as a buffer. For example, if the external pressure suddenly increases, the nitrogen in the airtight cavity 4 will be compressed due to the pressure difference, slightly reducing the cavity width to a certain extent. At this time, the nitrogen will absorb some of the external pressure energy, preventing excessive pressure transmission to the internal structure and protecting the internal rigid support layer 3 and the equipment body. Conversely, when the external pressure decreases, the nitrogen will expand, maintaining a certain pressure in the airtight cavity 4, maintaining the support force on the elastic buffer layer 2, and preventing excessive deformation of the elastic buffer layer 2 or gaps in the sealing structure due to sudden pressure changes. This ensures that the entire sealing structure maintains good airtight performance under various complex pressure environments, providing a solid guarantee for equipment in complex environments to resist external nuclear, chemical, and biological threats.

[0055] In one embodiment of this utility model, such as Figures 1-6 As shown, the interlayer bonding surfaces of the corrosion-resistant layer 1, the elastic buffer layer 2, and the rigid support layer 3 are provided with matching positioning bosses 102 and positioning grooves 203, and the height of the positioning bosses 102 is 0.3-0.5mm.

[0056] The assembly process involves first placing the corrosion-resistant layer 1 on the worktable with the positioning boss 102 facing upwards. Next, the elastic buffer layer 2 is slowly lowered, aligned with the corrosion-resistant layer 1. The positioning groove 203 on the elastic buffer layer 2, which matches the positioning boss 102, slides naturally along the contour of the positioning boss 102 until the two are fully engaged. Since the height of the positioning boss 102 is between 0.3-0.5 mm, this height ensures a tight fit between the positioning boss 102 and the positioning groove 203 without affecting the adhesion between layers due to excessive height. Guided by the positioning boss 102 and the positioning groove 203, the corrosion-resistant layer 1 and the elastic buffer layer 2 can quickly and accurately complete the initial positioning, greatly improving assembly efficiency and avoiding interlayer misalignment caused by manual alignment errors.

[0057] After assembling the corrosion-resistant layer 1 and the elastic buffer layer 2, connect the rigid support layer 3 to the assembled elastic buffer layer 2 in the same manner. Align the positioning groove 203 on the rigid support layer 3 with the positioning boss 102 on the elastic buffer layer 2, place it stably, and ensure it is fully embedded.

[0058] During equipment use, the cooperation between the positioning boss 102 and the positioning groove 203 plays a crucial role. When the sealing structure is subjected to external vibration, impact, or thermal expansion and contraction due to temperature changes, there may be a tendency for relative displacement between the layers. In this case, the tightly interlocking structure of the positioning boss 102 and the positioning groove 203 can limit the direction and degree of displacement of each layer, ensuring that each layer always maintains a relatively stable positional relationship. For example, when subjected to strong vibration, the positioning boss 102 will abut against the inner wall of the positioning groove 203 to prevent misalignment or separation between the corrosion-resistant layer 1, the elastic buffer layer 2, and the rigid support layer 3, maintaining the integrity and stability of the entire sealing structure, thereby ensuring that the protective performance of the equipment in complex environments is not affected.

[0059] In one embodiment of this utility model, such as Figures 1-6 As shown, it also includes a pressure sensor 6 installed inside the airtight cavity 4, and the pressure sensor 6 is connected to an external alarm device via a wire.

[0060] As can be understood, pressure sensor 6 is installed inside the airtight cavity 4, with its sensing end directly in contact with the nitrogen gas filling the airtight cavity 4. During normal operation of the equipment, pressure sensor 6 continuously operates, monitoring the gas pressure value inside the airtight cavity 4 in real time. Since the nitrogen gas pressure inside the airtight cavity 4 is set at 1.2-1.5 times the standard atmospheric pressure, pressure sensor 6 continuously converts the measured gas pressure data into electrical signals.

[0061] These electrical signals are transmitted to an external alarm device via connected wires. The external alarm device has a pre-set normal threshold range for the air pressure in the airtight cavity 4, which corresponds to an electrical signal range of 1.2-1.5 times the standard atmospheric pressure. When the airtight cavity 4 experiences gas leakage for some reason, causing a drop in internal air pressure, or when abnormal external pressure conduction causes an increase in air pressure, the electrical signal collected and transmitted by the pressure sensor 6 will exceed the normal threshold range preset by the alarm device.

[0062] Once the alarm device receives an electrical signal exceeding the threshold, its internal circuitry will immediately trigger the alarm mechanism. The alarm device will then issue an audible and visual alarm to alert the operator that the air pressure in airtight chamber 4 is abnormal. Upon receiving the alarm, the operator can quickly inspect and maintain the equipment, promptly addressing any issues with airtight chamber 4 to prevent a decline in airtightness from affecting the overall protective effect of the equipment in complex environments. This ensures the equipment operates reliably in complex environments and guarantees the safety of personnel and equipment.

[0063] It should be noted that the control method of this application can be automatically controlled by a controller. The control method of the controller can be implemented by simple programming by those skilled in the art, which is common knowledge in the field. Furthermore, this application is mainly used to protect mechanical structures, so the control method and circuit connection will not be explained in detail here.

[0064] Specifically, suppose that equipment operating in complex environments suddenly encounters a strong external impact while performing a mission, and is simultaneously in an environment with high humidity and corrosive chemicals. In this situation, the outermost corrosion-resistant layer 1 comes into play first. The hydrophobic texture 101 on its outer surface prevents moisture from adhering in the humid environment, reducing the risk of corrosion, while the polytetrafluoroethylene material resists the erosion of surrounding corrosive chemicals, protecting the internal structure.

[0065] When the elastic buffer layer 2 is impacted, the silicone rubber matrix 201 initially absorbs the impact energy due to its flexibility and elasticity, while the carbon fiber woven mesh 202 enhances the overall structural strength and prevents excessive deformation of the silicone rubber matrix 201. At the same time, the nitrogen gas filled in the airtight cavity 4 buffers and regulates the internal air pressure due to changes in external pressure, maintaining stable internal air pressure and further reducing the impact on the interior.

[0066] The elastic connector 5 between each layer, namely the corrugated stainless steel spring sheet, flexibly bends and extends when the relative displacement of each layer is caused by impact. It adapts to the displacement by changing the distance between the crests and troughs, buffers the relative movement of each layer, and ensures that the connection between each layer is stable.

[0067] The rigid support layer 3, thanks to the high strength of its aluminum alloy material, evenly distributes the external force it bears, preventing excessive deformation of the elastic buffer layer 2 and the corrosion-resistant layer 1. Its inner dovetail groove structure 301 is tightly engaged with the equipment body, ensuring that the sealing structure and the equipment body do not loosen during impact.

[0068] Throughout the process, the pressure sensor 6 inside the airtight chamber 4 continuously monitors the air pressure. If the airtight chamber 4 experiences a gas leak due to impact or other reasons, causing a drop in air pressure, or if the air pressure rises due to abnormal external pressure transmission, the pressure sensor 6 will convert the changed air pressure data into an electrical signal, which will be transmitted to the external alarm device via a wire. Once the electrical signal exceeds the preset threshold range corresponding to 1.2-1.5 times the standard atmospheric pressure, the alarm device will immediately issue an audible and visual alarm. Upon receiving the alarm, the operator will quickly inspect and maintain the equipment, promptly addressing any potential problems with the airtight chamber 4, ensuring that the equipment maintains good performance in complex environments and protecting the safety of personnel and equipment.

[0069] In summary, the multi-layer composite sealing structure of this utility model embodiment, with polytetrafluoroethylene, silicone rubber and carbon fiber composite and aluminum alloy three layers working together, is corrosion resistant, deformation resistant and stable, and can cope with complex working conditions. The airtight cavity is filled with nitrogen at 1.2-1.5 times the atmospheric pressure to maintain airtightness in emergencies. The dovetail groove and spring plate connection simplifies assembly. The gradient material increases the overall lifespan by more than 30%, reducing costs and increasing efficiency.

[0070] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-layer composite seal structure, characterized by, It comprises an anticorrosion layer (1), an elastic buffer layer (2) and a rigid support layer (3) which are sequentially stacked from outside to inside, wherein, The outer surface of the anticorrosion layer (1) is provided with a hydrophobic texture (101); The elastic buffer layer (2) and the rigid support layer (3) form an annular airtight cavity (4) therebetween, and the airtight cavity (4) is filled with inert gas; Each layer is dynamically connected by at least two groups of elastic connecting pieces (5), and the two ends of the elastic connecting pieces (5) are embedded in the grooves of the adjacent layers. The inner side of the rigid support layer (3) is provided with a dovetail groove structure (301) for clamping and fixing with the equipment body.

2. The multi-layer composite seal structure of claim 1, wherein, The anticorrosion layer (1) is made of polytetrafluoroethylene (PTFE) with a thickness of 0.5-1mm, and the hydrophobic texture (101) is a continuous wavy protrusion.

3. The multi-layer composite seal structure of claim 1, wherein, The elastic buffer layer (2) is composed of a silicone rubber matrix (201) and a carbon fiber woven mesh (202) embedded therein, with a thickness of 2-3mm, and the carbon fiber woven mesh (202) is distributed in a diamond grid shape.

4. The multi-layer composite seal structure of claim 1, wherein, The rigid support layer (3) is made of aluminum alloy with a thickness of 1.5-2mm, and the dovetail groove structure (301) is uniformly distributed in the circumferential direction with a groove depth of 0.8-1.2mm.

5. The multi-layer composite seal structure of claim 1, wherein, The elastic connecting piece (5) is a wavy stainless steel spring sheet with a wave peak and valley distance of 2-3mm, and the groove depth is 1.2-1.5 times the thickness of the spring sheet.

6. The multi-layer composite seal structure of claim 1, wherein, The cross section of the airtight cavity (4) is semicircular with a cavity width of 1-1.5mm, and the inert gas is nitrogen with a gas pressure of 1.2-1.5 times the standard atmospheric pressure.

7. The multi-layer composite seal structure of claim 1, wherein The interlayer bonding surface of the anticorrosion layer (1), the elastic buffer layer (2) and the rigid support layer (3) is provided with a matching positioning boss (102) and a positioning groove (203), and the height of the positioning boss (102) is 0.3-0.5mm.

8. The multi-layer composite seal structure according to any one of claims 1 to 7, wherein It also includes a pressure sensor (6) arranged inside the airtight cavity (4), and the pressure sensor (6) is connected to an external alarm device through a wire.

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