FUEL SYSTEM OF DIESEL ENGINE DESIGNED FOR OPERATION OF DIMETHYL ETHER Russian patent published in 2006 - IPC F02M21/02 F02M59/46 

FIELD: mechanical engineering; diesel engines.

SUBSTANCE: proposed fuel system of diesel engine designed for operation on dimethyl ether contains service cylinder connected through liquid phase take-off valve to input of fuel feed pump whose output is coupled with liquid phase supply space of high-pressure pump whose cutoff space is connected through spring-loaded valve to service cylinder by means of vapor phase valve. Overplunger space of high-pressure pump is connected with nozzle of diesel engine combustion chamber through delivery valve and high-pressure fuel line. Delivery valve of high-pressure pump is made in form of double-acting valve consisting of main and return valves. Main valve is connected to nozzle by high-pressure fuel line, and return valve is coupled with overplunger space of high-pressure pump. Each valve is provided with spring and is arranged in corresponding housing. Valves are installed relative to each other for relative contact and displacement either together or separately. Main valve is provided with jet which can be overlapped from side of return valve at contacting of valves, and main parameters of double-acting valve are defined by following relations: where d_j is diameter of jet of main valve; d_rv is diameter of return valve, δ_rv is stiffness of spring of return valve; δ is stiffness of spring of main valve; F_rv is preload of spring of return valve; F is preload of spring of main valve.

EFFECT: elimination of steam plugs and uncontrollable injections.

4 dwg