Fuel injector with built-in positive temperature coefficient ceramic heating material

Abstract

An oil injector, inside which a positive temperature coefficient ceramics heating material is arranged, mainly comprises an injector needle valve, an injector needle valve body, an injector body, an injector tappet, an injector pressure-adjusting spring, a round heat transfer pipe inside the injector body, positive temperature coefficient heating ceramics inside the injector body, an insulated jacket inside the injector body, a round heat transfer pipe inside an oil inlet bolt, positive temperature coefficient heating ceramics inside the oil inlet bolt, an insulated jacket inside the oil inlet body, and so on. Positive temperature coefficient heating ceramics is arranged inside the oil inlet bolt and the oil injector, heats the diesel oil with a self-controlling temperature via the heat transfer pipes, and is insulated through the insulated jacket. The invention provides an oil injector used for diesel heating at the self-controlling temperature during the coal start and warm-up courses. The heating temperature will not exceed the boiling point of diesel oil. Less heating is needed, and the heating is quicker, so the diesel emission can be effectively improved and the cold-start performance can be promoted.

Description

technical field [0001] The invention relates to a fuel injector for an internal combustion engine, in particular to a fuel injector with a built-in positive temperature coefficient ceramic heating material, which belongs to the technical field of internal combustion engines. Background technique [0002] Compression ignition engines using diesel as fuel have high thermal efficiency and are widely used. Due to the large output of diesel, which dominates the fuel consumption of diesel engines, diesel engines will still use diesel as fuel for a long time in the future. However, the main problems of diesel engines are not only emission problems, but also the improvement of cold start performance. In order to reduce cold start emissions, many technologies have been adopted to improve the emission and cold start performance of diesel engines. In the prior art, the document "Research on Low-temperature Starting of Diesel Engine Using Intake Flame Preheating" ("Internal Combustion ...

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Problems solved by technology

At present, there is no relevant literature report on the construction of positive temperature coefficient electrothermal materials in diesel engine injectors

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