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Common rail fuel injection system with fuel circulation for a large two-stroke diesel engine

A fuel injection system and fuel injection technology, applied in the direction of fuel injection devices, charging systems, mechanical equipment, etc., can solve the problems of no degassing effect, increased engine maintenance complexity, increased device complexity, etc.

Inactive Publication Date: 2007-11-14
MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, steam insulation or electric heating elements add complexity to the installation and complicate engine overhaul due to the need to remove the steam insulation or electric heating elements prior to inspection and reassemble after overhaul
Also, when the engine is stopped and external heating is used to maintain the temperature of the fuel valve, there is no degassing effect brought by the fuel cycle

Method used

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  • Common rail fuel injection system with fuel circulation for a large two-stroke diesel engine
  • Common rail fuel injection system with fuel circulation for a large two-stroke diesel engine
  • Common rail fuel injection system with fuel circulation for a large two-stroke diesel engine

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Embodiment Construction

[0023] 1 and 2 respectively show a sectional view and a longitudinal sectional view (for a single cylinder) of an engine 1 according to a preferred embodiment of the invention. The engine 1 is a one-way flow, low-speed, two-stroke, crosshead crosshead diesel engine, which can be used as a propulsion system of a ship or a prime mover in a power plant. These engines typically have 3 to 14 cylinders arranged in series. Engine 1 is formed by a base plate 2 with main bearings for crankshaft 3 .

[0024] Crankshaft 3 is of the semi-compound type. The semi-composite type is made of a forged or cast steel crank that is connected to the main journal by a shrink fit.

[0025] The bottom plate 2 can be integrated or divided into several parts of appropriate size according to the convenience of manufacture. The base plate includes side walls and welded cross girders with bearing seats. Cross beams are also referred to as "transverse beams" in the prior art. An oil pan 58 is welded to...

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Abstract

The invention provides a large two-stroke diesel engine with a common fuel injection system. A fuel injection of a large two-stroke diesel engine includes a low pressure conduit, an intermediate pressure conduit, a high pressure common fuel rail. The control valves control the flow from the common fuel rail to the fuel injection valve. The fuel valve comprises a entry connected with control valve through injection conduit, and a exit connected with the low pressure conduit. The control valve connects the injection conduit with common rail when the fuel injection starts, and connects the injection conduit with low pressure conduit or intermediate pressure conduit when the fuel injection ends. The invention furthermore comprises valve gear for connecting the intermediate pressure conduit with injection conduit directly or by control valve, and for fuel cycle during outofoperation of engine.

Description

technical field [0001] The present invention relates to a common rail fuel injection system with a fuel circulation device for a large two-stroke diesel engine, more particularly, the present invention relates to a system that operates on heavy fuel oil and therefore requires insulation to prevent fuel A common rail fuel injection system in which fuel solidifies in the injection system components. Background technique [0002] Large two-stroke diesel engines of the crosshead type are used, for example, to propel large marine vessels, or as prime movers in power plants. The construction of these two-stroke diesel engines is not identical to that of any other internal combustion engine, not solely because of size. The principle of the two-stroke and the use of heavy fuel oils, whose viscosity is below 700 cst at 50°C (the said oils do not flow at room temperature) make them a unique class in the field of engines. [0003] Because heavy fuel oil does not flow at room temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D19/12F02M43/00F02M63/00
CPCY02T10/121Y02T10/12F02M39/00F02M47/00F02M55/02
Inventor 尼尔斯·维德特费尔特·拉斯穆森
Owner MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND
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