An environmentally resistant heat resistant shell assembly for an aviation electromechanical mechanism

Abstract

The utility model relates to aviation field especially relates to an environmental resistance heat -resistant shell body assembly for aviation electric mechanism. Shell body assembly includes: output shaft, front end cover, shell, rear end cover, shell is the cylindrical structure of both ends opening, and the both ends of shell are sealed and fixed link with front end cover and rear end cover respectively, and output shaft is installed in front end cover.

Description

Technical Field

[0001] This utility model relates to the aviation field, and in particular to an environmentally resistant and heat-insulating housing assembly for aviation electric mechanisms. Background Technology

[0002] In ultra-high altitude environments, stationary equipment is constantly exposed to extreme low temperatures, and the limited power of auxiliary heating restricts its use. While existing metal casings are robust, their high thermal conductivity leads to excessive heat loss, failing to meet the energy-saving and insulation requirements of the equipment. Ordinary composite materials, due to their low conductivity or being insulating materials, cannot meet electromagnetic compatibility requirements.

[0003] This necessitates a new shell structure to overcome the technical shortcomings of the existing solutions. Utility Model Content

[0004] Purpose of this utility model: To provide an environmentally resistant and heat-insulating housing assembly for aviation electric mechanisms, which meets the energy-saving and heat-insulating requirements of the equipment while also satisfying electromagnetic compatibility requirements.

[0005] Technical solution: An environmentally resistant and heat-insulating housing assembly for an aviation electric mechanism is provided, comprising: an output shaft, a front cover, a housing, and a rear cover; The housing is a cylindrical structure with openings at both ends, and the two ends of the housing are sealed and fixed to the front cover and the rear cover, respectively; the output shaft is installed on the front cover.

[0006] Furthermore, the shell has a multi-layer composite structure, consisting of an outer protective layer, a metal shielding layer, a curing layer, a heat insulation layer, and an installation cavity layer from the outside to the inside. The innermost layer of the housing is formed by injection molding and machining; its function is to provide a stable and reliable internal environment for mounting and securing the product's critical transmission components. The insulation layer is located outside the inner cavity layer and is made of highly insulating material; its function is to block internal temperature loss and external low temperature intrusion, ensuring that the product operates in a stable temperature environment. The curing layer not only protects the insulation layer, but also combines with the metal shielding layer to provide additional support and protection for the entire shell; The function of the metal shielding layer is to provide electromagnetic compatibility protection; The outer protective layer further blocks external low temperatures from being conducted into the casing, while also enhancing the surface's weather resistance.

[0007] Furthermore, the inner cavity layer is a PEEK layer; The insulation layer is a low thermal conductivity layer; thermal conductivity ≤ 0.02 W / m·K; The curing layer, serving as an intermediate layer, is made of polyimide / PEI material through injection molding and curing. The metal shielding layer is a stainless steel base layer; The outer protective layer is a low thermal conductivity ceramic layer.

[0008] Furthermore, a mounting groove for mounting a conductive sealing strip is provided on the mounting surface of the housing that connects to the front cover.

[0009] Furthermore, the conductive sealing strip is a trapezoidal conductive sealing strip.

[0010] Furthermore, a gap is opened at the bottom of the trapezoidal groove. After the trapezoidal conductive sealing strip expands due to heat, the expanded part fills the gap at the bottom of the groove.

[0011] Beneficial effects: This invention employs advanced composite materials and a multi-layered structural design to form a highly efficient thermal insulation barrier, significantly reducing heat conduction and loss. The insulation effect is long-lasting, maintaining stable internal temperature over extended periods. The product operates normally within an extreme range (≤-90℃), utilizing a low-temperature resistant, special temperature-compensated sealing design to ensure that product performance does not degrade or function is lost during temperature changes. This invention uses low-temperature resistant materials and special sealing rubber to ensure effective sealing even at extremely low temperatures, and the electromagnetic shielding of the housing components still meets usage requirements. Attached Figure Description

[0012] Figure 1 A side view of an environmentally resistant, heat-insulating housing assembly for an aircraft electric mechanism.

[0013] Figure 2 A top view of an environmentally resistant, heat-insulating housing assembly for an aircraft electric mechanism.

[0014] Figure 3 Front view of an environmentally resistant, heat-insulating housing assembly for an aircraft electric mechanism.

[0015] Figure 4 This is a temperature distribution diagram of the inner and outer surfaces of the shell.

[0016] Figure 5 This is a schematic diagram of the sealing structure.

[0017] Figure 6 This is a stress cloud diagram of the composite material.

[0018] Figure 7 This is a diagram of the shell structure.

[0019] Figure 8 This is a diagram of the sealing structure.

[0020] Figure 9 This is a diagram showing the expansion of rubber at high temperatures. Detailed Implementation

[0021] This utility model provides an environmentally resistant and heat-insulating housing assembly for an aviation electric mechanism, the structure of which is as follows: Figure 1-3 As shown, it includes: output shaft 1, front end cover 3, housing 4, rear end cover 5, and trapezoidal conductive sealing strip 6; The housing 4 is a cylindrical structure with openings at both ends. The two ends of the housing 4 are sealed and fixed to the front cover 3 and the rear cover 5, respectively. The output shaft 1 is installed on the front cover 3.

[0022] The front opening of the housing 4 has an outwardly facing mounting edge, and the mounting edge has a mounting hole 2, which is used to mate with the mounting component and install it on the front end of the housing 4.

[0023] 1. Highly efficient thermal insulation technology Shell 4 utilizes advanced composite materials and a multi-layered structural design to form a highly efficient thermal barrier, significantly reducing heat conduction and loss. The insulation effect is long-lasting, maintaining stable internal temperature for extended periods. Figure 4 As shown.

[0024] 2. Wide temperature adaptability design The environmentally resistant and heat-insulating housing assembly for aviation electric mechanisms operates normally within an extreme range of (≤-90℃). It adopts a low-temperature resistant and special temperature-compensated sealing design to ensure that the product performance is not reduced or the function is not lost when the temperature changes.

[0025] 3. Low-temperature sealing technology The environmentally resistant and heat-insulating housing assembly for aviation electric mechanisms uses low-temperature resistant materials and special sealing rubber to ensure effective sealing even at extremely low temperatures, and the electromagnetic shielding of the housing assembly still meets the requirements of use. 4. Lightweight design The environmentally resistant and heat-insulating housing components for aviation electric mechanisms achieve reduced product weight and improved power-to-weight ratio through lightweight design while meeting functional and performance requirements.

[0026] The composite material shell design proposed in this invention features multiple unique layers and material choices, aiming to provide superior thermal insulation, electromagnetic compatibility, and thermal shielding.

[0027] 1. Blocks extreme low temperatures and provides thermal insulation. High thermal resistance composite materials and multi-layered composite structures are selected as the shell material to ensure sufficient rigidity and strength even at -100℃. The composite insulated shell design effectively blocks heat conduction and convection from the external low-temperature environment, improving product energy efficiency and reducing internal heating energy consumption. The shell material's strength has been reduced from ≥10 W / m·K to 0.02 W / m·K, significantly improving insulation performance. Figure 5 As shown, by adopting a composite material shell, the heat dissipation power of the original aluminum alloy shell has been reduced from 2kW to less than 30W, greatly reducing the internal heating energy consumption.

[0028] 2. Wide temperature adaptability The product can operate reliably at extremely low temperatures. At the same time, it effectively ensures the electromagnetic compatibility shielding of the outer casing.

[0029] Under low temperature conditions, the product's sealing structure ( Figure 6 It meets sealing requirements and its strength can withstand mechanical environmental conditions such as impact and vibration. Under high-temperature conditions, the seal can achieve thermal expansion compensation through a temperature compensation structure, reducing damage to the seal caused by local stress. It effectively prevents external foreign objects such as moisture and sand from entering the product.

[0030] 3. Lightweight design While meeting the product's functional and performance requirements, optimize the material structure to achieve product lightweighting, such as... Figure 6 As shown.

[0031] 1. Shell composition as follows Figure 7 As shown: Fifth composite layer (outer protective layer): ceramic coating A low thermal conductivity ceramic material is applied using ultrasonic spraying. The primary function of this layer is to further prevent external low temperatures from being conducted into the casing, while simultaneously enhancing the surface's weather resistance. This low thermal conductivity ceramic material possesses excellent thermal insulation and weather resistance, protecting the internal structure from damage in harsh environments.

[0032] Fourth composite layer (metal shielding layer): stainless steel substrate Using 1Cr18Ni9Ti improves the bonding strength of ultrasonic spraying, increases the surface rigidity of the product, and enhances the overall strength. The thickness is approximately 0.5 mm.

[0033] This layer primarily serves to provide electromagnetic compatibility protection, reducing the impact of external electromagnetic interference on the internal circuitry. Simultaneously, the stainless steel material enhances the rigidity and strength of the casing, improving the overall structural stability and durability.

[0034] Third composite layer (curing layer): intermediate layer It is made of polyimide / PEI material by injection molding and curing, with a thickness of approximately 0.3~1mm; The cured layer not only protects the insulation layer but also, in conjunction with the metal casing, provides additional support and protection for the entire housing. PEI and polyimide materials possess excellent mechanical properties and thermal stability, enabling them to withstand high and low temperatures and mechanical shocks.

[0035] Second composite layer (insulation layer): low thermal conductivity material It uses high-efficiency heat insulation material with a thermal conductivity of ≤0.02W / m·K, which reduces the thermal conductivity.

[0036] Located outside the inner cavity layer, this layer is made of highly insulating material. Its main function is to prevent internal heat loss and external low-temperature intrusion, ensuring that the product operates in a stable temperature environment and improving its low-temperature reliability and lifespan.

[0037] First composite layer (installation cavity layer): PEEK material This is the innermost layer of the housing, formed through injection molding and machining. Its primary function is to provide a stable and reliable internal environment for mounting and securing the product's critical transmission components.

[0038] 2. Sealing structure such as Figure 8 As shown.

[0039] Trapezoidal conductive sealing strips are used for housing sealing and conductivity; The front cover is used to fix the product's output shaft, provide shielding and protection for the product, and connect to the housing; like Figure 9 As shown, the housing rubber strip can compensate for thermal expansion and contraction when the temperature of the housing rubber strip installation position changes, reducing excessive local stress; by applying axial pressure to the outer sealing surface, the trapezoidal section in the gasket is deformed, thereby producing a sealing effect; a gap is left at the bottom of the sealing groove, and when thermal expansion occurs, the rubber strip is squeezed out from the gap at the bottom of the groove, reducing the stress caused by strain and improving the durability of the rubber strip.

[0040] When the product is at a low temperature, the interference fit compensates for the shrinkage due to cold, thereby achieving a sealing and conductive effect.

[0041] The front cover is connected to the housing by a conductive sealing strip to form a conductor, thereby enhancing the electromagnetic shielding capability.

Claims

1. An environmentally resistant and heat-insulating housing assembly for an aircraft electric mechanism, characterized in that, include: Output shaft (1), front cover (3), housing (4), rear cover (5); The housing (4) is a cylindrical structure with openings at both ends. The two ends of the housing (4) are sealed and fixed to the front cover (3) and the rear cover (5) respectively; the output shaft (1) is installed on the front cover (3). The shell (4) is a multi-layer composite structure, consisting of an outer protective layer, a metal shielding layer, a curing layer, a heat insulation layer, and an installation cavity layer from the outside to the inside. The inner cavity layer is the innermost layer of the shell, which is formed by injection molding and machining. Its function is to provide a stable and reliable internal environment for installing and securing the product's critical transmission components; The insulation layer is located outside the inner cavity layer and is made of highly insulating material. Its function is to prevent internal temperature loss and external low temperature intrusion, ensuring that the product operates in a stable temperature environment; The curing layer not only protects the insulation layer, but also combines with the metal shielding layer to provide additional support and protection for the entire shell; The function of the metal shielding layer is to provide electromagnetic compatibility protection; The outer protective layer further blocks external low temperatures from being conducted into the casing, while also enhancing the surface's weather resistance.

2. The component according to claim 1, characterized in that, The inner cavity layer is a PEEK layer; The insulation layer is a low thermal conductivity layer; thermal conductivity ≤ 0.02 W / m·K; The curing layer, serving as an intermediate layer, is made of polyimide / PEI material through injection molding and curing. The metal shielding layer is a stainless steel base layer; The outer protective layer is a low thermal conductivity ceramic layer.

3. The component according to claim 1, characterized in that, An installation groove for installing a conductive sealing strip is provided on the mounting surface of the housing (4) that is connected to the front cover (3).

4. The component according to claim 3, characterized in that, The conductive sealing strip is a trapezoidal conductive sealing strip.

5. The component according to claim 4, characterized in that, The trapezoidal groove has a bottom gap. After the trapezoidal conductive sealing strip expands due to heat, the expanded portion fills the bottom gap.

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