Composite gasket

Abstract

The utility model provides a kind of composite sealing gasket, including glass fiber mesh, first elastomer is provided in the upside of glass fiber mesh, second elastomer is provided in the downside of glass fiber mesh;Wherein, the upside of first elastomer and the downside of second elastomer are respectively provided with several sealing ribs.The utility model uses high-density rubber in upper and lower sides, glass fiber mesh is set in high-density rubber as framework, which plays a good supporting role on sealing gasket, so that sealing gasket has high toughness, high strength sealing effect, combined with the setting of upper and lower sides gradual change type sealing rib, good sealing effect is played, and compression permanent deformation rate is small, which avoids leakage problem after long time use.The sealing gasket provided by the utility model has simple structure, simple production, small compression permanent deformation rate and long service life.

Description

Technical Field

[0001] This utility model relates to the field of power system sealing technology, and more specifically, to a composite sealing gasket. Background Technology

[0002] As the core power component of the air conditioning system, the intake sealing performance of the aircraft compressor directly determines the compressor's volumetric efficiency and long-term operational stability. This sealing component needs to operate in a high-low temperature cycling environment of 0~230℃ for extended periods, withstand intake pressure impacts of up to 87.02psi (approximately 0.6MPa), and simultaneously resist vibration loads of 1500~2000Hz and the erosion effects of high-speed airflow (velocity ≥30m / s) during compressor operation. This places stringent requirements on the material properties and structural design of the sealing components.

[0003] Current compressor sealing products generally suffer from the following technical defects: First, traditional single-material rubber (such as pure fluororubber) sealing components are prone to a decrease in cross-linking density under high-temperature environments above 200℃, resulting in a compression permanent deformation rate exceeding 25%. After 3000 flight hours of use, cracking and leakage are likely to occur, reducing compressor efficiency by 5% to 8%. Second, sealing components lacking structural reinforcement design have a local wear rate of 0.02mm / thousand-hours under vibration conditions, resulting in a service life of less than 6000 flight hours. Third, the high compression deformation rate of the gasket leads to gaps between the gasket and the housing surface, resulting in leakage.

[0004] Chinese patent CN202732935U discloses a skeleton-type sealing ring, including a sealing ring body with a central hole in the middle. The sealing ring body consists of an annular metal ring and a rubber layer covering the metal ring. The central hole is a stepped hole with diameters at both ends larger than the diameter at the middle. This utility model has a reasonable structure, incorporating a metal skeleton within a traditional rubber sealing ring, increasing the sealing ring's strength and making it less prone to wear or scratches, thus ensuring a good sealing effect. This type of sealing ring is also less prone to deformation and more durable. The stepped central hole facilitates easy fitting onto components during use. This patent reduces deformation and improves structural strength, making it less prone to wear. However, this product requires the additional production of a corresponding metal skeleton, and there are many risk control points during skeleton production and storage, affecting product production efficiency. Utility Model Content

[0005] The technical problem solved by this utility model is that in the prior art, skeleton-type sealing rings require the production of corresponding metal skeletons, and there are many risk control points in the production and storage of skeletons, which affects the production efficiency of the products.

[0006] This utility model discloses a composite sealing gasket, comprising:

[0007] A fiberglass mesh, wherein a first elastic body is disposed on the upper side of the fiberglass mesh and a second elastic body is disposed on the lower side of the fiberglass mesh;

[0008] Several sealing ribs are respectively provided on the upper side of the first elastic body and the lower side of the second elastic body.

[0009] Furthermore, the fiberglass mesh has a plain weave structure.

[0010] Furthermore, the fiberglass mesh includes a first fiberglass cloth and a second fiberglass cloth, the first fiberglass cloth is connected to a first elastomer to form an upper elastic component, the second fiberglass cloth is connected to a second elastomer to form a lower elastic component, and the upper elastic component is connected to the lower elastic component.

[0011] Furthermore, an adhesive layer is provided on the side of the upper elastic component facing the lower elastic component, and the upper elastic component and the lower elastic component are integrally vulcanized.

[0012] Furthermore, the sealing gasket is arranged in a ring shape, and a plurality of mounting through holes are provided along the circumference of the sealing gasket. The mounting through holes penetrate the first elastomer, the glass fiber mesh, and the second elastomer.

[0013] Furthermore, the sealing gasket has a rectangular annular structure.

[0014] Furthermore, an identification plate is provided on one of the long sides of the sealing gasket.

[0015] Furthermore, the sealing rib is arranged in a ring around the circumference of the sealing gasket.

[0016] Furthermore, the height of the sealing rib gradually increases from the position near the mounting through hole to the position away from the mounting through hole.

[0017] Furthermore, the mounting through hole is disposed between two adjacent sealing ribs, and at least one supplementary rib is provided on the outer periphery of each mounting through hole, the supplementary rib cooperating with the sealing rib to surround the mounting through hole.

[0018] Compared with the prior art, the composite sealing gasket of this utility model has the following advantages:

[0019] This invention utilizes high-density rubber on both the top and bottom sides, with a fiberglass mesh forming a skeleton within the high-density rubber to provide excellent support for the sealing gasket. This results in a gasket with high toughness and high-strength sealing performance. Combined with the gradient sealing ribs on the top and bottom sides, it achieves a superior sealing effect and exhibits a low compression set, preventing leakage after prolonged use. The sealing gasket provided by this invention has a simple structure, is easy to manufacture, has a low compression set, and a long service life. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the composite sealing gasket described in an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0022] Figure 3 This is an exploded view of the composite sealing gasket described in an embodiment of the present invention;

[0023] Figure 4 This is a side view of the composite sealing gasket described in an embodiment of the present invention.

[0024] Figure 5 This is a partial cross-sectional structural diagram of the composite sealing gasket described in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the glass fiber mesh fabric described in an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100, First elastomer; 200, Second elastomer; 300, Fiberglass mesh; 310, First fiberglass cloth; 320, Second fiberglass cloth; 400, Sealing rib; 500, Supplementary rib; 600, Mounting through hole. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only some, not all, of the embodiments of this utility model. The specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. It should be noted that, unless otherwise specified, the embodiments and features described in the present utility model can be combined with each other.

[0029] The following describes a composite sealing gasket according to an embodiment of the present invention in detail with reference to the accompanying drawings.

[0030] This embodiment provides a composite sealing gasket, such as Figures 1-6 As shown, it includes:

[0031] A glass fiber mesh 300, wherein a first elastic body 100 is provided on the upper side of the glass fiber mesh 300 and a second elastic body 200 is provided on the lower side of the glass fiber mesh 300.

[0032] A plurality of sealing ribs 400 are respectively provided on the upper side of the first elastic body 100 and the lower side of the second elastic body 200.

[0033] Through the above configuration, the sealing gasket forms a sandwich composite structure of "elastomer-reinforcing layer-elastomer". The embedded glass fiber mesh 300 provides high-strength skeleton support for the sealing gasket, giving it high toughness and strength, and effectively preventing overload deformation and leakage. The sealing ribs 400 on the upper and lower sides are equivalent to multiple independent sealing lines, forming multiple sealing barriers, which greatly improves the reliability of the seal. In addition, the skeleton in the prior art is usually a metal part, which needs to be processed separately. In this example, the embedded glass fiber mesh 300 is used as the skeleton, which can be automatically cut and formed after multiple parts are produced at the same time. Compared with the prior art, there is no need to process the skeleton separately, which reduces the control risks of the skeleton during production and storage. Moreover, multiple sealing gaskets can be produced at one time, which significantly improves production efficiency and reduces production costs. As one possible example, the first elastomer 100 and the second elastomer 200 are high-density silicone rubber. Silicone rubber has excellent resistance to high and low temperature alternation, can maintain good elasticity and flexibility in a wide temperature range, and has a relatively small permanent deformation rate. Combined with the setting of glass fiber mesh 300, the wear resistance of the gasket is significantly improved. The setting of sealing rib 400 effectively prevents the gap between the gasket and the shell, ensuring sealing performance and effectively solving the sealing failure problem caused by high temperature aging and vibration wear of traditional gaskets. It should be noted that the silicone rubber can be made from materials already available in the prior art, or it can be prepared using the following components: the silicone rubber is made by adding a solid silicone rubber paste-like vulcanizing agent and an antioxidant NR-1 paste, wherein the amount of the bis(2,5)-vinyl chloride paste-like vulcanizing agent added is 1.2 phr and the amount of the antioxidant NR-1 paste added is 2 phr; after the silicone rubber produced by the above components is integrally molded with glass fiber mesh at a high temperature of 300°C, according to DIN53504, the tensile strength at 150°C is >50 MPa, and according to ISO 815-1 standard, the compression set at 150°C × 24h is <20%, and the compression set at 200°C × 24h is <35%.

[0034] As one example, such as Figure 6 As shown, the fiberglass mesh 300 has a plain weave structure. Preferably, the warp and weft density of the fiberglass mesh 300 is 44×34 (threads / inch), and the single filament diameter is 7μm. Using the above-mentioned warp and weft density and single filament diameter, the plain weave fiberglass cloth can form an ideal mechanical interlocking structure with the upper and lower elastomers while ensuring excellent tensile strength and rigidity, resulting in high bonding strength and ensuring the integrity and long-term stability of the composite structure. Optionally, the thickness of the fiberglass mesh 300 is 0.25±0.01mm.

[0035] As one example, such as Figure 3 As shown, the fiberglass mesh 300 includes a first fiberglass cloth 310 and a second fiberglass cloth 320. The first fiberglass cloth 310 is connected to the first elastomer 100 to form an upper elastic component, and the second fiberglass cloth 320 is connected to the second elastomer 200 to form a lower elastic component. The upper and lower elastic components are connected. Preferably, the first fiberglass cloth 310 and the first elastomer 100 are calendered together, with the first fiberglass cloth 310 at least partially calendered and embedded into the side surface of the first elastomer 100. Similarly, the second fiberglass cloth 320 and the second elastomer 200 are calendered together, with the second fiberglass cloth 320 at least partially calendered and embedded into the side surface of the second elastomer 200. Specifically, the calendered thickness of the first elastomer 100 and the second elastomer 200 is 0.6 mm, exhibiting good uniformity, which is beneficial for controlling the thickness accuracy of the compressor sealing product. Through the above configuration, the upper and lower elastic components can be pre-prepared using efficient calendering processes, simplifying the production process and ensuring the uniformity and accuracy control of the thickness of each layer. Tensile strength is an important indicator of sealing materials. The higher the tensile strength, the better the sealing performance of the gasket. In this example, the first fiberglass cloth 310 and the first elastomer 100, and the second fiberglass cloth 320 and the second elastomer 200 are respectively combined to form a mechanical interlocking structure with a bonding strength ≥3MPa. This strength can effectively prevent the risk of leakage caused by gasket overload in the high-pressure environment of aircraft climbing. In addition, the gasket is reinforced with fiberglass mesh. According to the test of GB / T1040.3 standard, the gasket provided in this example has a tensile strength that is more than 40% higher than that of traditional pure rubber gaskets.

[0036] Preferably, an adhesive layer is provided on the side of the upper elastic component facing the lower elastic component, and the upper and lower elastic components are integrally vulcanized. The adhesive layer is disposed between the first fiberglass cloth 310 and the second fiberglass cloth 320. Specifically, during production, the upper and lower elastic components are first pre-fixed in the positioning groove of the tooling cavity for applying adhesive; the adhesive is spread evenly in the tooling cavity, and the adhesive is applied evenly with a stick; the surface film of the first elastomer 100 and the second elastomer 200 is peeled off; after mold closing, it is placed in a flat vulcanizing machine for vulcanization to obtain an integrally formed sealing gasket blank. One optional vulcanization process is: at 160℃ × 100kg / cm 3The gasket is vulcanized for 5 minutes under the specified conditions, followed by a second vulcanization at 180℃ for 4 hours. For the gasket blank, subsequent processes include trimming (removing burrs to a thickness ≤0.05mm), cutting (placing the blank in a cutting device and cutting according to the dimensions and shape in the drawings), and finally dimensional inspection (e.g., using a coordinate measuring machine of model LH650) to ensure the finished product meets tolerance requirements. Optionally, the adhesive layer is formed after the adhesive has cured, and the adhesive is an ultra-thin liquid silicone. The surface of the vulcanized gasket is treated with high-gloss polishing to achieve a thickness accuracy of 1.4±0.05mm, further improving the sealing performance of the gasket.

[0037] As an example of this utility model, such as Figure 1 As shown, the sealing gasket is annularly arranged, with several mounting through holes 600 along its circumference. These through holes 600 penetrate the first elastic body 100, the fiberglass mesh 300, and the second elastic body 200. The annular structure and the mounting through holes 600 allow it to perfectly fit common annular sealing surfaces such as compressor inlets and flange joints, ensuring a sealing effect. During assembly, the sealing gasket is quickly positioned onto the compressor inlet flange mounting surface, and stainless steel bolts are used to tighten it through the mounting through holes 600. The gap between the bolts and the mounting through holes 600 is compensated by the high elastic deformation of the sealing ribs 400, achieving a seal. In one optional example, the stainless steel bolts are M4×10 with a torque of 8 N•m, and after assembly, the contact pressure of the sealing surface is ≥1.2 MPa. In one example, as... Figure 1 As shown, eight mounting through holes 600 are evenly arranged along the circumference of the sealing gasket. The diameter of each mounting through hole 600 is 4.5mm ± 0.02mm. The positions where the mounting through holes 600 connect to the first elastic body 100 and the second elastic body 200 are rounded with a radius of 0.5mm ± 0.05mm. The local stress value generated by bolt tightening during assembly is ≤ 5MPa. This design effectively avoids stress concentration caused by thread tightening during assembly, preventing the sealing gasket from cracking.

[0038] As one example, such as Figure 1 As shown, the sealing gasket is a rectangular annular structure. This structure is used to adapt to the installation interface of the air conditioning system compressor of the Airbus A320 series aircraft to ensure its sealing performance. It should be understood that the sealing gasket can also be other annular structures adapted to the corresponding mounting flange, such as circular rings, etc., which can be cut and processed according to specific requirements and drawings, and are not limited here.

[0039] Preferably, a label (not shown in the attached diagram) is provided on one of the long sides of the sealing gasket. The label facilitates the use of laser engraving technology to mark key information such as product part number, batch number, and supplier, enabling full lifecycle quality traceability of the product. It also facilitates visual inspection during assembly to prevent omissions or misassemblies. As one optional example, the label is 20mm × 10mm in size, and information is marked on its surface using laser engraving technology at a depth of 0.1~0.15mm. The marked information includes the PMA part number, material type, mold cavity number, and supplier code. The laser engraving of the label can be performed after trimming.

[0040] In this example, such as Figure 1 As shown, the sealing ribs 400 are arranged in a ring around the circumference of the sealing gasket. The continuous ring of sealing ribs 400 can form a uniform and continuous seal at the sealing interface, effectively isolating the internal and external media and ensuring the basic sealing performance of the sealing gasket. It should be noted that there are more than two sealing ribs 400 on the upper and lower sides. Since the sealing ribs 400 are arranged in a ring, it is equivalent to forming multiple sealing barriers. When one sealing rib 400 fails, the other sealing ribs 400 can still play a sealing role.

[0041] Preferably, the height of the sealing rib 400 gradually increases from a position near the mounting through hole 600 to a position away from the mounting through hole 600. It should be understood that during bolt fastening, insufficient stress in areas away from the bolts can cause gaps between the gasket and the mounting housing. The gradual increase in the height of the sealing rib 400 as it moves away from the mounting through hole 600 compensates for this gap, resulting in a better fit between the gasket and the housing surface after installation, thus ensuring a good seal. Therefore, the gradual increase in the height of the sealing rib 400 in this example effectively avoids poor fit due to insufficient tightening force, effectively compensating for the gap between the gasket and the housing. Compared to existing planar gaskets, it improves the compression deformation rate by 20%, reduces the requirements for the flatness, dimensional tolerances, and assembly of the upper and lower housings for gasket installation, and achieves a good sealing effect.

[0042] Better, such as Figure 1As shown, the mounting through-hole 600 is positioned between two adjacent sealing ribs 400, and at least one supplementary rib 500 is provided around the outer periphery of each mounting through-hole 600. The supplementary rib 500 cooperates with the sealing rib 400 to surround the mounting through-hole 600. It should be noted that when the bolt is tightened, a large local stress is generated around the mounting through-hole 600. The design of the supplementary rib 500 can strengthen the rigidity of this area, disperse and absorb local stress, and prevent the gasket from being excessively compressed or even cracked at the mounting through-hole 600. In addition, the supplementary rib 500 cooperates with the sealing rib 400 to form a localized and stronger sealing ring around the bolt, effectively preventing gas or liquid media from leaking from the inside to the outside through the bolt mounting position. Furthermore, by positioning the mounting through-hole 600 between two adjacent sealing ribs 400, even if there is a gas or liquid leak, it will be locked between the two adjacent sealing ribs 400 to prevent outward leakage. Thus, a multi-layered sealing guarantee is formed against gas or liquid leakage, significantly improving the safety of the gasket.

[0043] Performance test results show that after the sealing gasket provided in this example passes the RTCAO-160G high and low temperature cycling test (50 cycles at 0~230℃, 12 hours per cycle), the leakage at the sealing surface is ≤1×10⁻. 5 Pa·m³ / s; tested according to ASTM D412 standard, tensile strength ≥8.5MPa, elongation at break ≥300%; no tearing was observed during a high-temperature tear test (230℃×4h) at 87.02psi pressure; after 6000 flight hours of simulated operating condition testing according to Airbus AIPS05-10-503 standard, the compression set was 12%, the sealing performance was not reduced, and the service life was extended by 15% compared to imported similar products. The compression set was also lower than that of similar products. After 6000 hours of simulated flight, the sealing performance was good, and the leakage at the sealing surface was extremely low, fully meeting the requirements for use of air intake seals for aviation compressors.

[0044] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "tail end," "head end," and "center," are only used to explain the relative positional relationship and connection between components in a specific state. They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A composite sealing gasket, characterized in that, include: A glass fiber mesh (300) has a first elastic body (100) disposed on its upper side and a second elastic body (200) disposed on its lower side. Among them, a plurality of sealing ribs (400) are respectively provided on the upper side of the first elastic body (100) and the lower side of the second elastic body (200).

2. The composite sealing gasket as described in claim 1, characterized in that, The glass fiber mesh (300) has a plain weave structure.

3. The composite sealing gasket as described in claim 1, characterized in that, The glass fiber mesh (300) includes a first glass fiber cloth (310) and a second glass fiber cloth (320). The first glass fiber cloth (310) is connected to a first elastomer (100) to form an upper elastic component, and the second glass fiber cloth (320) is connected to a second elastomer (200) to form a lower elastic component. The upper elastic component and the lower elastic component are connected.

4. The composite sealing gasket as described in claim 3, characterized in that, An adhesive layer is provided on the side of the upper elastic component facing the lower elastic component, and the upper elastic component and the lower elastic component are integrally vulcanized.

5. The composite sealing gasket as described in any one of claims 1-4, characterized in that, The sealing gasket is arranged in a ring shape, and a plurality of mounting through holes (600) are provided along the circumference of the sealing gasket. The mounting through holes (600) penetrate the first elastomer (100), the glass fiber mesh (300), and the second elastomer (200).

6. The composite sealing gasket as described in claim 5, characterized in that, The sealing gasket has a rectangular ring structure.

7. The composite sealing gasket as described in claim 6, characterized in that, An identification plate is provided on one of the long sides of the sealing gasket.

8. The composite sealing gasket as described in claim 5, characterized in that, The sealing rib (400) is arranged in a ring around the circumference of the sealing gasket.

9. The composite sealing gasket as described in claim 8, characterized in that, The height of the sealing rib (400) gradually increases from the position near the mounting through hole (600) to the position away from the mounting through hole (600).

10. The composite sealing gasket as described in claim 9, characterized in that, The mounting through hole (600) is disposed between two adjacent sealing ribs (400), and at least one supplementary rib (500) is provided on the outer periphery of each mounting through hole (600). The supplementary rib (500) cooperates with the sealing rib (400) to surround the mounting through hole (600).

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