Dimethyl ether engine fuel supply system and fuel injector thereof

Abstract

The invention discloses a dimethyl ether fuel injector. The dimethyl ether fuel injector comprises a needle valve body and a needle valve, wherein the needle valve body is provided with a fuel inlet channel communicated with a valve cavity of the needle valve body; a pressure regulation spring is arranged in the valve cavity of the needle valve body; a fuel nozzle is arranged on the head of the needle valve body; the fuel nozzle is provided with a fuel injection hole which is opened or closed by moving from the needle valve along the axial direction of the valve cavity; the surface, contacted with the inner cavity of the fuel nozzle, of the head of the needle valve is provided with an anti-abrasion coating layer. In the fuel injector, the anti-abrasion coating layer bears friction caused by a relevant reciprocating motion between the needle valve and the fuel nozzle, so that abrasion between the fuel nozzle of the oil injector and the needle valve can be reduced effectively, and the service life of the fuel injector is prolonged. The invention also provides a dimethyl ether engine fuel supply system comprising the fuel injector.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a dimethyl ether injector. The present invention also relates to a dimethyl ether engine fuel supply system comprising the above dimethyl ether injector. Background technique [0002] DME has the characteristics of low boiling point, low volumetric calorific value and low viscosity. Compression ignition combustion under high compression ratio has the same thermal efficiency as diesel engine. At the same time, the molecular formula of DME does not contain C-C bond, which can realize smokeless combustion. , therefore, dimethyl ether as a fuel for compression ignition engines can achieve clean combustion and is an excellent green energy source. [0003] The DME engine fuel supply system usually consists of a fuel tank storing DME fuel, a booster pump, a high-pressure pump, and an injector. When working, the booster pump obtains dimethyl ether fuel from the fuel tank, pressurizes i...

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Problems solved by technology

[0005] However, the diesel engine will experience a power drop problem after burning dimethyl ether. The fuel injection frequency of the fuel injector is related to the engine speed, so the fuel injection frequency of the fuel injector is relatively high. It can be seen from the above that the needle valve and fuel injection The nozzle head needs to be contacted and separated at a high frequency. Due to the low viscosity of dimethyl ether, the wear of the needle valve and the nozzle head is relatively serious, and because dimethyl ether has no C-C bond, high-temperature cracking does not produce graphite If the buffe

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