Electric heating unit mold and method for preparing electric heating unit assembly

Abstract

The invention discloses an electric heating unit mold and a method for preparing an electric heating unit. A base of the electric heating unit mold protrudes upwardly and is matched with a convex moldwith the same shape and size as a blade body leading edge at the inner position of 1-2 layer of a skin; the circumferences of the working surface end and the non-working surface end of the convex mold are the circumferences of an electric heating unit assembly wrapping from the boundary of the blade body leading edge to the working surface end and the non-working surface end; and the upper end surfaces, at the two ends of the convex mold, of the base change with connecting curves of the two edges of the electric heating unit and the blade body leading edge. One or more layers of insulating protective layer prepreg is laid on the convex mold of the electric heating unit mold, then the electric heating unit is laid, and finally the one or more layers of insulating protective layer prepreg is laid again; and sleeving of sealing bags is carried out, and vacuumizing and compaction are carried out. The electric heating unit assembly manufactured by using the electric heating unit mold is laid and installed at a prescribed position on the leading edge of a blade at a time, the probability of breaking and damage of a foam core is reduced, the laying layer is high in density, the strengthis high, the manufacturing accuracy is high ,and the aerodynamic performance of the blade is not affected.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel compressors, and relates to an electric heating unit mold and a method for preparing an electric heating unit assembly. Background technique [0002] The wind tunnel is the basic equipment for aerodynamic tests. When the wind tunnel is running, the energy to maintain the gas flow is provided by the motor to drive the axial flow fan. The energy consumption of the air flow in the wind tunnel pipeline is specifically manifested in the pressure drop. The function of the axial flow fan is to increase the pressure of the airflow. When the two are balanced, the wind tunnel can run stably. Generally, the power of the wind tunnel is very large, and the power of the axial flow fan is also required to be high, otherwise it will cause a lot of wind energy loss. Affects various performance indicators of the test section of the wind tunnel. During the test of the icing wind tunnel, due to the ice phenomeno...

AI Technical Summary

Problems solved by technology

During the test of the icing wind tunnel, due to the ice phenomenon on the leading edge of the blades of the existing wind tunnel in the wet and cold environment, when the ice freezes to a certain extent, it will cause large vibrations and the test cannot continue. Equipment in the Icewind Tunnel wreaks havoc

Therefore, the icing wind tunnel blade must have anti-icing function. The traditional anti-icing blade is to lay the insulating protective layer, electric heating element and insulating protective layer directly on the leading edge of the blade within 1-2 layers of the skin. Difficult, and because the connection between the steel petiole and the foam core is weak, and the trailing edge of the blade is thin, the foam core at the connection is easily broken and the trailing edge of the foam core is easily damaged under multiple layers of pressing. The strength is small, the layup is loose, the density is poor, and the manufacturing accuracy is low, which even affects the overall structure of the blade and affects the aerodynamic performance of the blade

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