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Stress Relief in Pressurized Fluid Flow Systems

一种应力释放、加压流体的技术，应用在装料系统、发动机元件、机器/发动机等方向，能够解决工艺很贵、影响生产过程坚固性耐用性等问题

Active Publication Date: 2011-12-07
DELPHI TECH IP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes include shot peening (in which the surface is bombarded with shots of sufficient force to cause plastic deformation) and prestressing (in which the chamber to be treated experiences unusually high pressures), but these processes are expensive, Can affect the production process and can also cause robustness (or durability) issues

Method used

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  • Stress Relief in Pressurized Fluid Flow Systems
  • Stress Relief in Pressurized Fluid Flow Systems
  • Stress Relief in Pressurized Fluid Flow Systems

Examples

Experimental program
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Embodiment Construction

[0045] figure 2 Elements used in embodiments of the invention are shown. figure 2 A generalized illustration of a component 100 for high pressure fluid flow is provided. This member 100 is shown here as being radially symmetric about the main bore 110 , but as described further below, such radial symmetry is not provided in all embodiments. The component 100 is compressed in use between other components in the component stack which will define the fluid path into and out of the main bore 110, and this compression will prevent leakage at the boundaries between the component 100 and these other components, which act as Loading elements on component 100.

[0046] The member 100 has a secondary bore 120 that intersects the primary bore 110 at an intersection 130 . Under high pressure fluid flow conditions, especially those rapidly cycling between high and low pressures, such intersections 130 will typically be exposed to significant tensile stress unless steps are taken to al...

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PUM

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Abstract

The invention discloses stress relief in a pressurized fluid flow system. A method of reducing tensile stress within a drilled element (100) at an intersection (130) between a primary bore (110) and a secondary bore (120) comprises the following steps. A first face of the drilled element (100) is loaded with a first loading element. A compressive hoop stress is generated where the first face of the drilled element (100) is loaded by the first loading element, and the intersection (130) is sufficiently close to the first face of the drilled element (100) such that the compressive hoop stress counteracts tensile stress in the drilled element (100) at the intersection (130). A suitable drilled element (100) and fluid flow systems, such as a fuel injector, including such a drilled element (100) are also described.

Description

technical field [0001] The present invention relates to stress relief in pressurized fluid flow systems, particularly systems in which fluid flows at high pressure through component bores. The invention is particularly applicable where a component or element with a primary hole requires a secondary hole which has an intersection with the primary hole. Background technique [0002] High pressure fluid flow systems need to be designed to resist significant operating stresses. An example of such a fluid flow system is a fuel injector, which is used to deliver fuel into the combustion space of an internal combustion engine. For heavy duty applications, such as fuel injection of diesel engines for trucks, fuel injectors must be able to deliver small amounts of fuel at very high pressures (on the order of 300 MPa). [0003] Tensile stress is an important cause of failure in such systems, and crack propagation is caused by tensile stress rather than compressive stress. The point...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/16
CPCC21D7/10C21D9/0068F02M61/168F02M2200/8053Y10T408/03Y10T408/21Y10T137/8593
Inventor S.罗克斯
Owner DELPHI TECH IP LTD