Heat-insulation cover

Abstract

The invention discloses a heat-insulation cover, and belongs to the technical field of engines. The heat-insulation cover comprises a heat-insulation cover body and a nozzle; the outside of a heat source part is sleeved with the heat-insulation cover body; the area between the heat-insulation cover body and the heat source part is the air area; one end of the air area is an air inlet, and the other end is an air outlet; the nozzle is fixed to the heat-insulation cover body, is used for guiding outside gas into the air area and comprises a gas inlet end and a gas outlet end; the gas outlet endcommunicates with the air area; the gas outlet end faces the air outlet; the nozzle is of a necked structure; and the diameter of the gas outlet end is smaller than that of the gas inlet end. According to the heat-insulation cover, outward transfer of heat produced by the heat source part can be reduced through passive heat insulation; and active directed heat dissipation can be realized, so thathot-dipping working conditions can be avoided, and the heat dissipation requirements of the heat source part can be met.

Description

Technical field [0001] The invention relates to the technical field of engines, in particular to a heat shield. Background technique [0002] With the development of automobile technology, the layout of vehicle cabins is becoming more and more compact, especially hybrid vehicles have not only transmission engines, but also motors and electronic water pumps, which have brought rubber tubes, wiring harnesses and plastic parts with low temperature resistance. The extensive use of parts. The temperature of some parts of the engine exhaust system can reach 900°C and above, which poses a great threat to the safety of surrounding parts. Therefore, heat source parts such as engine exhaust must be insulated. [0003] At present, the heat shield attached to the exhaust system of the automobile engine mainly includes: exhaust manifold heat shield, supercharger heat shield and catalyst heat shield. The heat insulation principle of the existing heat shield is mostly passive heat insulation, g...

AI Technical Summary

Problems solved by technology

However, the existing heat shield ignores the heat dissipation requirements of the heat source part itself, which easily causes the heat accumulation of the heat source part, and the temperature of the heat source part increases greatly, which eventually leads to the ineffective heat insulation of the heat shield, thus making the heat insulation effect of the heat shield become worse or even fail

In addition, existing heat shields cannot provide protection against thermal damage in certain extreme conditions, such as heat soak conditions

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