Arrangement type for electric control high-pressure common rail systems on marine high-speed high-power diesel engines

Abstract

The invention belongs to the technical field of marine high-speed high-power diesel engines, and relates to an arrangement type for electric control high-pressure common rail systems on marine high-speed high-power diesel engines. The arrangement type is characterized in that each electric control high-pressure common rail system is provided with a common rail oil injection pump I and a common rail oil injection pump II which correspond to a column B of common rail pipes and a column A of common rail pipes; two timing gears are connected with output ends of the common rail oil injection pump I and the common rail oil injection pump II and are independent from each other; a flow limit valve I is arranged between each cylinder on a side A of a corresponding V-type diesel engine and the column A of common rail pipes; a flow limit valve II is arranged between each cylinder on a side B of the V-type diesel engine and the column B of common rail pipes; pressure relief valves are arranged on the B column of common rail pipes. The arrangement type has the advantage that sufficient oil still can be supplied by the remaining common rail oil injection pumps under the condition of maximum continuous output power of main propulsion machinery even if one of the common rail oil injection pumps fails.

Description

technical field [0001] The invention belongs to the technical field of high-speed and high-power marine diesel engines, and relates to an arrangement type of an electronically controlled high-pressure common rail system on high-speed and high-power marine diesel engines. Background technique [0002] In order to meet the increasingly stringent emission regulations, diesel engine manufacturers around the world are actively developing new products to reduce diesel engine emissions. The electronically controlled high-pressure common rail fuel injection technology is unique because of its good application prospects. [0003] Electronically controlled high-pressure common rail fuel injection technology is to deliver high-pressure fuel to the common rail pipe by the common rail fuel injection pump. , speed changes, respectively adjust the fuel injection pressure and fuel injection volume, and precisely optimize the combustion efficiency. It can improve the economy of the diesel en...

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Problems solved by technology

Although "Electrically Controlled High-Pressure Common Rail System for V-Type Diesel Engine" (CN202690281U), the patent "A Double-rail High-Pressure Common-Rail System" (CN105386914A) and the patent "A V-type 8-cylinder Diesel Engine High-Pressure Common-Rail Fuel Injection System Arrangement Type" (CN105386914A) proposed the arrangement type of the electronically controlled high-pressure common rail system in the diesel engine. Although the arrangement type of the electronically controlled high-pressure common rail system meets the requirements of the diesel engine, there are many deficiencies, which are mainly reflected in: 1. The electronically controlled high-pressure common rail of the marine diesel engine There are at least two common rail fuel injection pumps in the system, and the arrangement can realize that when one of the common rail fuel injection pumps fails, the remaining common rail fuel injection pumps can still supply sufficient fuel under the condition of the maximum continuous output power of the main propulsion machinery, but the The layout of the electronically controlled high-pressure common rail system does not involve how to arrange two common rail fuel injection pumps; 2. The common rail pipe and high-pressure oil pipe of the electronically controlled high-pressure common rail system for marine diesel engines should be protected by bushings or other equivalent facilities to prevent leakage of hydraulic pressure. The oil splashes to the fire source and burns, but the layout of the electronically controlled high-pressure common rail system does not involve how to protect the leaked fuel; 3. The marine electronically controlled high-pressure common rail system should arrange a flow limiting valve to prevent the fuel injector from malfunctioning when the flow rate is too large. Close the flow-limiting spool to prevent too much high-pressure fuel from flowing into the injector from the common rail pipe, and then spray into the cylinder, causing the engine to run out of control, causing harm to equipment and personnel, and playing a role of safety protection

However, the layout of the electronically controlled high-pressure common rail system is not mentioned; 4. The marine electronically controlled high-pressure common rail system should be equipped with an over-guaranteed pressure relief valve, which can adjust the amount of fuel in the common rail pipe provided by the fuel injection pump, so as to control the pressure in the common rail pipe The purpose is also to prevent the sudden stop of the diesel engine. The pressure in the common rail pipe maintains a peak pressure of 1600bar, causing the diesel engine to fail to start (note: the normal starting rail pressure is 400bar). If the pressure is released manually, it may cause harm to personnel. The pressure valve can play a role of safety protection, but the layout of the electronically controlled high-pressure common rail system does not mention

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