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Injection nozzle

A technology of nozzles and nozzle holes, applied in fuel injection devices, engine components, machines/engines, etc., can solve problems such as expensive manufacturing process, lengthy, adverse effects on nozzle performance, achieve good fuel atomization performance, improve pressure and speed Flow, the effect of improving the discharge coefficient

Active Publication Date: 2011-10-12
DELPHI TECH IP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, it should be noted that the design K factor Orifice values ​​between 1 and 2.5 are sensitive to the length of the orifice such that variations in orifice length can potentially adversely affect nozzle performance
The machining of the nozzle holes in existing nozzles thus requires a high specification of precision, resulting in a lengthy and expensive manufacturing process

Method used

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Embodiment Construction

[0047] The following description of the invention is discussed with reference to its application to fuel nozzles. However, it should be noted that the invention is applicable to any type of nozzle for ejecting fluid from a first volume into a second volume. For example, the nozzle may be used to inject liquid fuel from a supply volume into a heating / combustion chamber in a domestic heating system. Other applications of the invention include gasoline direct injection systems and stoves.

[0048] It should also be noted that the use of nozzles according to embodiments of the invention as described below is not limited to any particular type of engine.

[0049] It should be noted that the same numerals are used to designate the same features in the following description. It should also be noted that in the following discussion the term mean Used as a shorthand notation to describe how the separation value of the nozzle hole wall varies along the length of the nozzle hole. ...

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Abstract

An injection nozzle for injecting a fluid, the injection nozzle comprising: a nozzle body and a nozzle hole defining a flow passage for fluid, the flow passage comprising passage walls and the nozzle hole having an inlet in fluid communication via the flow passage with an outlet, wherein, the inlet is larger than the outlet and for at least one section through the inlet and outlet along the flow passage the nozzle hole is defined, for all distances x within a substantial length of the flow passage, by the condition: (Formula) >45 microns / millimetre, where S = passage wall separation and x is the distance from the inlet.

Description

technical field [0001] The invention relates to a nozzle. More specifically, the present invention relates to improved formation and contouring of nozzles for ejecting fluid from an inner nozzle volume to an outer volume. The invention has particular applicability to fuel injection systems, but is applicable to any device employing a nozzle arrangement to inject fluid from a first volume into a second volume. Background technique [0002] For internal combustion engines using direct injection technology, fuel is typically injected from nozzles that employ a multi-hole nozzle design in which each individual hole (nozzle outlet) has an internal geometry that is precision manufactured by a special tool. The internal hole geometry is defined and optimized for efficient liquid fuel atomization performance allowing rapid mixing of fuel and air within the combustion chamber. This optimization results in lower exhaust emissions, optimized combustion noise and lower fuel consumptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/18
CPCF02M61/182F02M61/184F02M61/1846
Inventor N·古尔拉斯L·多拉道西C·加斯C·勒西尤
Owner DELPHI TECH IP LTD