Integrated heating core for built-in porous heater and manufacturing method thereof

Abstract

The invention discloses an integrated heating core for a built-in porous heater and a manufacturing method thereof. The integrated heating core comprises a heating body, a heating body frame and a transition line, wherein the heating body is helically shaped and made of bar-type meshed porous nichrome alloy or bar-type meshed porous nickel-chromium alloy, the heating body frame is formed by closely arranging seven porous boron nitride tubes, the close arrangement of the seven porous boron nitride tubes include six surrounding porous boron nitride tubes and one central porous boron nitride tube, a separation plate is arranged in the central porous boron nitride tube, notches are formed at two ends of the surrounding porous boron nitride tubes, the heating body penetrates through the surrounding porous boron nitride tubes back and forth sequentially via the notches, and two ends of the heating body are leaded out from two sides of the separation plate of the central boron nitride tube after being welded with the transition line. The integrated heating core is the basis for manufacturing the built-in heater, and is high in resistance and heat exchange rate, small in size, stable in structure, and good in air permeability and insulation.

Description

technical field [0001] The invention relates to a heating element in a thermal control facility of an electrothermal thruster of an aerospace vehicle, in particular to an integrated heating core for a built-in porous heater and a preparation method thereof. Background technique [0002] At the end of the 20th century, my country Aerospace Science and Technology Corporation began to launch a series of space vehicles such as satellites and spacecraft, including low-orbit, long-life, three-axis stable earth observation satellites. At present, most satellites of this type use monopropellant (hydrazine) catalytic decomposition thrusters to adjust their attitude and orbit. On-orbit operation has strict requirements on the catalyst, and cold start will greatly damage the life of the catalyst. For this reason, the solution of covering the thermal control facilities outside the thrust chamber is adopted, and the catalytic bed is heated for a long time with an external heater. This no...

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Problems solved by technology

The existing heating core cannot meet the above requirements. The present invention is a new design and production of the integrated heating core of the built-in porous heater.

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