High temperature resistant metal rubber bellows

Abstract

The utility model provides high temperature -resistant metal rubber spring pipe belongs to high temperature sealed heat -proof subassembly technical field, including pipe body, the pipe body includes inside fixed layer, middle part support layer, outside protective layer, the middle part support layer is covered in the outside of inside fixed layer, outside protective layer is covered in the outside of middle part support layer. The utility model discloses through inside fixed layer, middle part support layer and outside protective layer have temperature -resistant, heat -insulating, elastic function, wherein inside fixed layer adopts inorganic fibre to provide high resistance, and middle part support layer provides elasticity and structural support, and outside protective layer provides wear resistance and secondary heat -insulating protection, is suitable for static or dynamic gap's sealing and hot air flow resistance.

Description

Technical Field

[0001] This utility model relates to the technical field of high-temperature sealing and heat insulation components, and in particular to high-temperature resistant metal rubber spring tubes. Background Technology

[0002] High-temperature gas leakage and vibration impact are common problems in hot-end components of aircraft, aerospace, and gas turbines. Traditional metal bellows are resistant to high temperatures but have poor plasticity and limited resilience; silicone rubber / fluororubber has good elasticity but a low upper temperature limit (≤320℃).

[0003] Existing technologies attempt to combine metal wires with rubber, but these methods have drawbacks. When metal wires are directly wound around rubber, the rubber carbonizes at high temperatures, causing a sharp drop in elasticity. Furthermore, the metal braided layer only serves a reinforcing function and cannot independently support the elastic skeleton, resulting in insufficient shaping and elasticity. This makes it difficult to maintain stable adhesion at complex interfaces, and after thermal cycling, interface delamination occurs, leading to permanent deformation and seal failure. Therefore, a high-temperature resistant metal-rubber spring tube is proposed. Utility Model Content

[0004] In view of this, the present invention provides a high-temperature resistant metal rubber spring tube to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial option.

[0005] The technical solution of this utility model is implemented as follows: it includes a tube body, which includes an inner shaping layer, a middle support layer, and an outer protective layer. The middle support layer covers the outside of the inner shaping layer, and the outer protective layer covers the outside of the middle support layer.

[0006] More preferably, the material of the internal shaping layer is an inorganic short fiber.

[0007] More preferably, the central support layer is made of woven metal alloy.

[0008] More preferably, the metal alloy weave is in the form of a spiral or mesh spring structure.

[0009] More preferably, the material of the outer protective layer is inorganic fiber.

[0010] More preferably, the outer protective layer is made of multiple strands of inorganic fibers interwoven together.

[0011] More preferably, the inner shaping layer and the middle support layer, and the middle support layer and the outer protective layer are bonded together by inorganic high-temperature adhesive dots.

[0012] The present invention has the following advantages due to the adoption of the above technical solution: I. This utility model combines the functions of temperature resistance, heat insulation, and elasticity through an internal shaping layer, a middle support layer, and an external protective layer. The internal shaping layer uses inorganic fibers to provide high barrier properties, the middle support layer provides elasticity and structural support, and the external protective layer provides wear resistance and secondary heat insulation protection. It is suitable for sealing static or dynamic gaps and resisting the flow of hot air.

[0013] II. This utility model combines the advantages of metal and rubber. It is softer and more malleable than metal, and can fit complex boundaries. It is more resistant to high temperatures than rubber and will not carbonize or fail in high-temperature environments. It is suitable for sealing static or dynamic gaps and blocking hot airflow. It can also be used for interfaces that are displaced by device movement, vibration or thermal expansion. The inorganic fiber materials and technical alloys can maintain their integrity and elasticity for a long time.

[0014] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention.

[0017] Reference numerals: 1. Tube body; 11. Internal shaping layer; 12. Middle support layer; 13. External protective layer. Detailed Implementation

[0018] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] Example: like Figure 1-2As shown, this utility model embodiment provides a high-temperature resistant metal rubber spring tube, including a tube body 1. The tube body 1 includes an inner shaping layer 11, a middle support layer 12, and an outer protective layer 13. The middle support layer 12 covers the outside of the inner shaping layer 11, and the outer protective layer 13 covers the outside of the middle support layer 12.

[0021] The inner shaping layer 11 is made of inorganic short fibers, the middle support layer 12 is made of woven metal alloy, and the outer protective layer 13 is made of inorganic fibers.

[0022] Specifically, the length of the tube body 1 and the thickness of the internal shaping layer 11, the middle support layer 12, and the outer protective layer 13 are customized according to requirements. The internal shaping layer 11 is composed of alumina fiber, aluminum silicate fiber, basalt fiber, or a mixture of the two, and is in a fluffy, chopped, or bundled form to provide heat insulation and high temperature resistance. The middle support layer 12 is woven from high-temperature nickel-based alloy wire, stainless steel wire, titanium alloy wire, or a combination thereof to provide structural support and temperature resistance. The outer protective layer 13 is woven from glass fiber, basalt fiber, quartz fiber, or silica-reinforced fiber to cover the metal braided layer, improve heat insulation, and reduce heat radiation loss caused by exposed metal.

[0023] In this embodiment, the inner shaping layer 11 is an inorganic short fiber of aluminum silicate, which fills the center of the tube body 1; the middle support layer 12 is a spring-shaped metal skeleton woven from nickel-based alloy wire; and the outer protective layer 13 is a metal skeleton covered by a basalt fiber woven sheath.

[0024] It should be noted that by compressing or bending the material, the tube 1 can fit into gaps of different shapes. The metal skeleton of the middle support layer 12 provides resilience to ensure a lasting fit. The inorganic fibers of the inner shaping layer 11 and the outer protective layer 13 serve as high-temperature barriers.

[0025] like Figure 2 As shown, in some embodiments, the metal alloy weave is in the form of a spiral or mesh spring structure, and the outer protective layer 13 is made of multiple strands of inorganic fibers interwoven together.

[0026] In this embodiment, the central support layer 12 has a spiral support structure, and its gaps can be compressed and automatically rebound when squeezed or bent, improving the overall plasticity and elasticity; the inorganic short fiber density in the inner shaping layer 11 is 0.08–0.25 g / cm³, ensuring sufficient heat insulation performance and flexibility; the inorganic fiber sleeve in the outer protective layer adopts a multi-strand interlaced weaving method, which can deform with the metal braided layer and improve wear resistance; the tube body 1 structure can be used for a long time in an environment of 600–1100℃, and the instantaneous temperature resistance exceeds 1300℃.

[0027] like Figure 1-2As shown, in some embodiments, the inner shaping layer 11 and the middle support layer 12, and the middle support layer 12 and the outer protective layer 13 are bonded together by inorganic high-temperature adhesive dots.

[0028] In this embodiment, the surface of the tube body 1 is also provided with an aluminum phosphate or yttrium stabilized zirconium oxide anti-oxidation coating with a thickness of 20–40 µm to enhance its service life.

[0029] Among them, the tube body 1 ensures that each layer can slide relative to each other when the whole is twisted and bent, thus avoiding shear damage.

[0030] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A high-temperature resistant metal-rubber spring tube, characterized in that: The tube includes a tube body (1), which includes an inner shaping layer (11), a middle support layer (12), and an outer protective layer (13). The middle support layer (12) covers the outside of the inner shaping layer (11), and the outer protective layer (13) covers the outside of the middle support layer (12). The material of the inner shaping layer (11) is inorganic short fiber, the middle support layer (12) is woven from metal alloy, and the material of the outer protective layer (13) is inorganic fiber.

2. The high-temperature resistant metal-rubber spring tube according to claim 1, characterized in that: The metal alloy is woven into a spiral or mesh spring structure.

3. The high-temperature resistant metal-rubber spring tube according to claim 2, characterized in that: The outer protective layer (13) is made of multiple strands of inorganic fibers interwoven together.

4. The high-temperature resistant metal-rubber spring tube according to claim 3, characterized in that: The inner shaping layer (11) and the middle support layer (12), and the middle support layer (12) and the outer protective layer (13) are bonded together by inorganic high-temperature adhesive dots.

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