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Built-in porous heater

A heater, built-in technology, applied in the direction of heating element material, heating element shape, etc., can solve the problems of large volume, can not meet the small electric thruster, heat resistance temperature is only 600 ℃, etc.

Active Publication Date: 2013-03-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

An electric thruster developed by British SSTL company is used for orbital lifting. The heating element of the heater used is nickel-chromium wire, which can heat the propellant medium to 1000K, but the power reaches 100W, and the volume is also large, which cannot meet the needs of small electric heaters. thruster needs
SSTL has also tested the heating performance of the overall heater made of carbon materials. When the power is 30W, it can heat 0.09 g / s propellant Xe from normal temperature to 210°C, but its heat-resistant temperature is only 600°C

Method used

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Embodiment Construction

[0065] The present invention is described in detail below through specific embodiments and accompanying drawings.

[0066] Take the heating element required by the electric heating hydrazine thruster as an example, and refer to Figure 1-6 .

[0067] Cut the nickel foam material into long strips of 1.5mm×1.2mm×1000mm, wind it into a spiral shape with a pitch of 0.5mm and a diameter of 1.0mm, and use solid phase infiltration technology to chrome it or chrome it and then infiltrate it Aluminum, a three-dimensional mesh porous nickel-chromium or nickel-chromium-aluminum heating element formed after vacuum heat treatment.

[0068] Use a laser processing machine to evenly and densely drill holes with a diameter of Φ1.0mm and a hole distance of 1.8mm on the tube wall of a boron nitride tube (diameter 5mm, wall thickness 0.5mm) with a length of 25mm to make a porous boron nitride tube; at the same time Use a micro-drill to make grooves on the pipe wall at both ends of the pipe, and...

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Abstract

The invention discloses a built-in porous heater. An integrated heating core is formed by circularly penetratingly winding a helical heating unit in a heating unit framework which is formed by closely arranging seven porous boron nitride tubes. The integrated heating core and a transitional leading out component are packaged in an armored casing and kept insulated from the shell. The heating body is connected with an outer lead line via a transition line, the transition line is in insulation protection with a joint of the outer lead line, and the joint, a thin tail end of a reducer tube and the outer lead line are fixedly sealed in a leading out section, so that integration between a heating element and a propelling chamber is realized. The built-in porous heater is applicable to heat control of an attitude and rail control propelling system for aerospace crafts, propellant medium utilized by an electric heating propeller passes through the built-in porous heater to directly contact with meshed porous electric heating materials so as to be heated up quickly, and the integrated heating core is high in heat exchange efficiency and low in power density. Electric heating performance, insulating performance and assembly performance of the built-in porous heater can meet requirements of the aerospace department.

Description

technical field [0001] The invention relates to a heating element inside an electrothermal thruster in an aerospace vehicle propulsion system, in particular to a built-in porous heater arranged inside the thruster. When the propellant medium passes through the mesh porous electrothermal material in the heater, it can is heated rapidly. Background technique [0002] The thruster is the actuator of the propulsion system that maintains or changes the orbit and motion attitude of the spacecraft. On the one hand, the heating element of the electric thruster can increase the temperature of the propellant to increase the specific impulse of the thruster, thereby improving the efficiency of the thruster; on the other hand, some propellants can be directly decomposed by electric heating in the thruster, without using a catalyst , thereby improving the reliability of the thruster. Therefore, in the world, whether it is a military satellite or a commercial satellite, the electrotherm...

Claims

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Application Information

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IPC IPC(8): H05B3/42H05B3/12
Inventor 段德莉李曙侯思焓张荣禄刘阳丁筱筠王鹏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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