Aviation explosion-proof electric heater

Abstract

The invention discloses an aviation explosion-proof electric heater, which comprises a shell, a heating element, an explosion-proof interlayer, an explosion-proof junction box and a heat insulation layer, and is characterized in that the shell is provided with an inlet and an outlet, and the inlet and the outlet are communicated with the shell, so that gas enters the shell from the inlet and flows out from the outlet; the explosion-proof interlayer is arranged between the shell and the heating element so as to separate the shell from the heating element, the explosion-proof interlayer comprises a metal net and high-temperature-resistant ceramic, and the metal net and the high-temperature-resistant ceramic are fixedly connected; the high-temperature-resistant ceramic is arranged on one side close to the heating element; the explosion-proof junction box is arranged at one end of the shell, and the explosion-proof junction box is fixedly connected with the shell; the heat insulation layer is arranged on the outer side of the shell and at least used for reducing heat loss. According to the aviation explosion-proof electric heater, through collaborative optimization design of multiple key components, comprehensive improvement of explosion-proof safety, operation reliability and environmental adaptability is achieved.

Description

Technical Field

[0001] This invention relates to an explosion-proof electric heater for aviation, belonging to the field of aviation equipment technology. Background Technology

[0002] In the aviation industry, electric heaters are widely used. For example, in aircraft fuel systems, electric heaters are needed to heat the fuel to prevent it from freezing; in cabin heating systems, electric heaters provide a warm environment for the cabin. However, the aviation environment is extremely complex and harsh, involving high temperatures, high pressures, vibrations, and the potential presence of flammable and explosive gases.

[0003] Existing electric heaters have numerous shortcomings when facing these aviation environments. In aircraft fuel systems, the casing materials of some electric heaters lack sufficient corrosion resistance and high-temperature resistance, making them prone to damage after prolonged use, leading to fuel leaks. Contact with the heating elements can easily trigger an explosion. In cabin heating systems, some electric heaters lack effective explosion-proof measures. When flammable gases leak in the cabin, the electrical sparks generated by the heaters could cause serious safety accidents. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide an explosion-proof electric heater for aviation with good explosion-proof performance and high safety and reliability.

[0005] To achieve the aforementioned objectives, the technical solution adopted by this invention includes:

[0006] An explosion-proof electric heater for aviation includes a housing, a heating element, an explosion-proof partition, an explosion-proof junction box, and a heat insulation layer. The housing has an inlet and an outlet, both of which are connected to the housing to allow gas to enter the housing through the inlet and exit through the outlet. The heating element is used to heat the gas entering the housing. The explosion-proof partition is disposed between the housing and the heating element to separate them. The explosion-proof partition includes a metal mesh and a high-temperature resistant ceramic, which are fixedly connected. The high-temperature resistant ceramic is disposed on the side closest to the heating element. The explosion-proof junction box is disposed at one end of the housing and is fixedly connected to the housing. The heat insulation layer is disposed on the outside of the housing and is used to reduce heat loss.

[0007] Furthermore, the outer shell is made of high-strength alloy material.

[0008] Furthermore, the mass fraction ratio of each element in the outer shell is 65:18:10:5 for iron:chromium:nickel:molybdenum.

[0009] Furthermore, an explosion-proof sealing ring is provided between the explosion-proof junction box and the outer casing.

[0010] Furthermore, the heating element includes multiple nickel-chromium alloy heating wires, which are parallel to the axis of the outer shell and connected by a fixing plate; the nickel-chromium alloy heating wires are tightly wrapped and filled with magnesium oxide powder.

[0011] Furthermore, a temperature sensor is installed inside the housing at the outlet end, and the temperature sensor is used to detect the temperature inside the housing at least.

[0012] Furthermore, the outer shell is horizontal, and the diameter of the middle part of the outer shell is larger than the diameter of the two ends.

[0013] Furthermore, the outer casing is provided with a first rectifier plate and a second rectifier plate. The first rectifier plate is provided with a plurality of first through holes, and the second rectifier plate is provided with a plurality of second through holes. Gas entering from the inlet passes through the first through holes, passes through the heating element, and flows out from the outlet through the second through holes.

[0014] Furthermore, the heat insulation layer includes a high-temperature resistant base layer, a heat insulation layer, a heat reflective layer, and a protective layer, which are arranged sequentially in the direction away from the outer shell.

[0015] Compared with the prior art, the advantages of the present invention include:

[0016] 1) The aviation explosion-proof electric heater provided by the present invention achieves a comprehensive improvement in explosion-proof safety, operational reliability and environmental adaptability through the collaborative optimization design of multiple key components;

[0017] 2) The present invention provides an explosion-proof electric heater for aviation, wherein the explosion-proof partition is made of a composite of metal mesh and high-temperature resistant ceramic material, which can effectively block flames and explosion shock waves, and significantly improve the explosion-proof performance of the electric heater;

[0018] 3) The present invention provides an explosion-proof electric heater for aviation, wherein the explosion-proof junction box can block the contact between the dangerous energy that may be generated during the electrical connection process and the external flammable and explosive substances, thereby preventing the occurrence of an explosion accident and ensuring the reliability of the electrical circuit connection.

[0019] 4) The present invention provides an explosion-proof electric heater for aviation, wherein the heat insulation layer is composed of a high-temperature resistant base layer, a heat insulation layer, a heat reflective layer and a protective layer, which can achieve a combination of high-efficiency heat insulation, explosion-proof safety and environmental reliability;

[0020] 5) The present invention provides an explosion-proof electric heater for aviation, wherein the outer shell is made of high-strength alloy material, which has good high temperature resistance, corrosion resistance, vibration resistance and insulation performance, and can effectively protect the internal components and improve the overall safety of the electric heater;

[0021] 6) The present invention provides an explosion-proof electric heater for aviation, wherein the heating element is encased in an insulating material, the insulating material being high-temperature resistant magnesium oxide powder, which can prevent the heating element from directly contacting the outer shell and causing a short circuit;

[0022] 7) The present invention provides an explosion-proof electric heater for aviation, which can accurately control the temperature inside the outer shell through a temperature sensor. Attached Figure Description

[0023] 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 recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of an aviation explosion-proof electric heater provided in a typical embodiment of the present invention;

[0025] Figure 2 This is a top view of an aviation explosion-proof electric heater provided in a typical embodiment of the present invention;

[0026] Figure 3 This is a sectional view of AA;

[0027] Figure 4 This is a front view of the insulation layer provided in a typical embodiment of the present invention;

[0028] Figure 5 This is a sectional view of BB;

[0029] Explanation of reference numerals in the attached drawings: 1. Outer shell; 2. Inlet; 3. Outlet; 4. Heating element; 5. Explosion-proof partition; 6. Explosion-proof junction box; 7. Heat insulation layer; 8. First rectifier plate; 9. Second rectifier plate; 10. High-temperature resistant base layer; 11. Heat insulation layer; 12. Heat reflective layer and protective layer. Detailed Implementation

[0030] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The following will further explain and illustrate this technical solution, its implementation process, and its principles.

[0031] like Figure 1 , Figure 2 , Figure 3As shown, this invention discloses an explosion-proof electric heater for aviation, comprising a shell 1, a heating element 4, an explosion-proof partition 5, an explosion-proof junction box 6, and a heat insulation layer 7. The shell 1 is provided with an inlet 2 and an outlet 3, both of which are connected to the shell 1, allowing gas to enter the shell 1 through the inlet 2 and exit through the outlet 3. Specifically, the shell 1 is made of a high-strength alloy material, possessing excellent high-temperature resistance, corrosion resistance, vibration resistance, and insulation properties, effectively protecting internal components and improving the overall safety of the electric heater. More specifically, the mass fraction ratio of each element in the shell 1 is 65:18:10:5 for iron:chromium:nickel:molybdenum.

[0032] The heating element 4 is used to heat the gas entering the outer casing 1. Specifically, the heating element 4 includes multiple nickel-chromium alloy heating wires, which have high heating efficiency and long service life. The nickel-chromium alloy heating wires are parallel to the axis of the outer casing 1, and the multiple nickel-chromium alloy heating wires are connected by a fixing plate. The fixing plate is provided with fixing grooves, and the multiple nickel-chromium alloy heating wires are fixed in the fixing grooves. The nickel-chromium alloy heating wires are tightly wrapped and filled with magnesium oxide powder, and the heating element 4 is wrapped in an insulating material. The insulating material is high-temperature resistant magnesium oxide powder to prevent the heating element 4 from directly contacting the outer casing 1 and causing a short circuit.

[0033] The explosion-proof partition 5 is disposed between the outer shell 1 and the heating element 4 to separate them. Specifically, the explosion-proof partition 5 comprises a metal mesh and a high-temperature resistant ceramic, which are fixedly connected. The high-temperature resistant ceramic is disposed on the side closest to the heating element 4. The metal mesh can block flames and blast shock waves, while the high-temperature resistant ceramic material has good heat insulation and electrical insulation properties, further enhancing the explosion-proof effect. The explosion-proof partition 5 is composed of a metal mesh and a high-temperature resistant ceramic material, which can effectively block flames and blast shock waves, significantly improving the explosion-proof performance of the electric heater.

[0034] The explosion-proof junction box 6 is disposed at one end of the outer shell 1. The explosion-proof junction box 6 is fixedly connected to the outer shell 1. Specifically, an explosion-proof sealing ring is provided between the explosion-proof junction box 6 and the outer shell 1.

[0035] like Figure 4 , Figure 5As shown, the heat insulation layer 7 is disposed on the outside of the outer shell 1. The heat insulation layer 7 is used to reduce heat loss. Specifically, the heat insulation layer 7 includes a high-temperature resistant base layer 10, a heat insulation layer 11, a heat reflective layer, and a protective layer 12. The high-temperature resistant base layer 10, the heat insulation layer 11, the heat reflective layer, and the protective layer 12 are arranged sequentially in the direction away from the outer shell 1. The high-temperature resistant base layer 10, the heat insulation layer 11, the heat reflective layer, and the protective layer 12 are connected by an adhesive layer, which can ensure that the insulation material does not delaminate under vibration. The adhesive layer can be made of high-temperature resistant silicone or an inorganic adhesive. In this embodiment, an inorganic adhesive can be used for the adhesive layer, combined with metal clamps to enhance reliability.

[0036] The heat insulation layer 7 is a composite of a high-temperature resistant base layer 10, a heat insulation layer 11, a heat reflective layer, and a protective layer 12, achieving a unified balance of high-efficiency heat insulation, explosion-proof safety, and environmental reliability. The heat reflective layer reflects infrared radiation from the heating element (heat radiation accounts for more than 50% of heat transfer at high temperatures), reducing radiative heat loss and improving overall heat insulation efficiency. The protective layer protects the internal heat insulation material from mechanical impact, vibration, and corrosion from moisture or other sources, while also possessing flame-retardant properties.

[0037] Specifically, the high-temperature resistant base layer 10 can withstand the high frequency and high temperature of the heating element, while also achieving electrical insulation (i.e., preventing short circuits and meeting explosion-proof insulation requirements), and isolating the heat source from direct conduction to the outer layer. The high-temperature resistant base layer 10 can be ceramic fiber paper or high-temperature resistant mica sheet. In this embodiment, the high-temperature resistant base layer 10 uses high-temperature resistant mica sheet, which has high insulation strength, good mechanical strength, and good vibration resistance.

[0038] Specifically, the heat insulation layer 11 can be aerogel felt, ultrafine glass wool, or high-purity aluminum silicate wool. In this embodiment, the heat insulation layer 11 uses aerogel felt, which is based on silica aerogel and reinforced with composite glass fiber or ceramic fiber, and has good heat insulation performance and vibration resistance.

[0039] Specifically, the heat reflective layer can be aluminum foil composite fiberglass cloth or aluminized polyimide film. In this embodiment, the heat reflective layer is aluminum foil composite fiberglass cloth. The aluminum foil (thickness 5-20μm) is used as the reflective layer, which can reflect more than 90% of infrared radiation. The base layer is fiberglass cloth, which can enhance the temperature resistance and mechanical strength of the aluminum foil and prevent the aluminum foil from oxidizing at high temperatures or breaking due to vibration.

[0040] Specifically, the protective layer includes flame-retardant fiberglass cloth or stainless steel wire mesh. In this embodiment, the protective layer includes stainless steel wire mesh. Using stainless steel wire mesh not only provides impact resistance and corrosion resistance, but also prevents internal materials from falling off due to severe vibration.

[0041] In some implementations, a temperature sensor is installed inside the housing 1 at the outlet 3 end. This temperature sensor is used to detect the temperature inside the housing 1. The aviation explosion-proof electric heater also includes a control system. The temperature sensor is signal-connected to the control system. The upper and lower threshold values ​​of the temperature sensor are respectively set within the control system. When the temperature sensor detects that the temperature inside the housing 1 is higher than the upper threshold, it sends a signal to the control system, which then controls the heating element 4 to stop heating. When the temperature sensor detects that the temperature inside the housing 1 is lower than the lower threshold, it sends a signal to the control system, which then controls the heating element 4 to start working, raising the temperature inside the housing 1. The temperature sensor allows for precise control of the temperature inside the housing 1.

[0042] In some implementations, the outer casing 1 is horizontal to prevent large temperature differences inside the casing 1. The diameter of the middle part of the outer casing 1 is larger than the diameters at both ends, which reduces the impact of gas on the heating element 4 when gas enters the casing, and at the same time increases the gas flow rate.

[0043] Based on the above, such as Figure 3 As shown, a first rectifier plate 8 and a second rectifier plate 9 are provided inside the outer casing 1. The first rectifier plate 8 has a plurality of first through holes, and the second rectifier plate 9 has a plurality of second through holes. Gas entering from the inlet 2 passes through the first through holes, the heating element 4, and the second through holes, and flows out from the outlet 3. The first rectifier plate 8 and the second rectifier plate 9 are used to rectify the gas entering the outer casing 1, thereby improving the uniformity of gas flow.

[0044] It should be understood that the above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An explosion-proof electric heater for aircraft, characterized by: The utility model relates to a kind of gas heating device, including Shell (1), the shell (1) is provided with inlet (2) and outlet (3), the inlet (2) and outlet (3) are communicated with shell (1), so that gas enters into shell (1) from inlet (2), flows from outlet (3); Heating element (4), the heating element (4) is at least used to heat the gas that enters into shell (1); Explosion-proof partition (5), the explosion-proof partition (5) is arranged between shell (1) and heating element (4), to separate shell (1) and heating element (4), the explosion-proof partition (5) includes metal net and high-temperature-resistant ceramic, and the metal net and high-temperature-resistant ceramic are fixedly connected;The high-temperature-resistant ceramic is arranged on the side close to heating element (4); Explosion-proof terminal box (6), the explosion-proof terminal box (6) is arranged in one end of shell (1), and the explosion-proof terminal box (6) is fixedly connected with shell (1); Thermal insulation layer (7), the thermal insulation layer (7) is arranged on the outside of shell (1), and the thermal insulation layer (7) is at least used to reduce heat loss.

2. The explosion-proof electric heater for aviation according to claim 1, characterized in that: The shell (1) adopts high-strength alloy material.

3. The explosion-proof electric heater for aviation according to claim 2, characterized in that: The mass fraction ratio of each element in the shell (1) is iron: chromium: nickel: molybdenum 65:18:10:

5.

4. The explosion-proof electric heater for aviation according to claim 1, characterized in that: An explosion-proof sealing ring is arranged between the explosion-proof terminal box (6) and the shell (1).

5. The explosion-proof electric heater for aviation according to claim 1, characterized in that: The heating element (4) includes a plurality of nickel-chromium alloy heating wires, which are parallel to the axis of the shell (1), and the plurality of nickel-chromium alloy heating wires are connected by a fixing disc.

6. The explosion-proof electric heater for aviation according to claim 1, characterized in that: A temperature sensor is arranged at the outlet (3) end inside the shell (1), and the temperature sensor is at least used to detect the temperature inside the shell (1).

7. The explosion-proof electric heater for aviation according to claim 1, characterized in that: The shell (1) is horizontal, and the diameter of the middle part of the shell (1) is greater than the diameter of the two ends.

8. The explosion-proof electric heater for aviation according to claim 1, characterized in that: A first rectifier plate (8) and a second rectifier plate (9) are arranged in the shell (1), the first rectifier plate (8) is provided with a plurality of first through holes, the second rectifier plate (9) is provided with a plurality of second through holes, and the gas entering from the inlet (2) passes through the first through hole, the heating element (4), and the second through hole to flow out from the outlet (3).

9. The explosion-proof electric heater for aviation according to claim 1, characterized in that: The thermal insulation layer (7) includes a high-temperature-resistant base layer (10), a thermal insulation layer (11), a heat reflecting layer and a protective layer (12), which are arranged in sequence away from the shell (1).

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