Anti-cavitation throttle for injector control valve

A technology for controlling valve and valve seat, which is applied in fuel injection control, engine control, fuel injection pump, etc., and can solve problems such as bubble generation and reduction

Active Publication Date: 2015-11-18
思达耐运营有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the control valve opens, the upstream fluid pressure drops rapidly, causing air bubbles to develop

Method used

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  • Anti-cavitation throttle for injector control valve
  • Anti-cavitation throttle for injector control valve
  • Anti-cavitation throttle for injector control valve

Examples

Experimental program
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Embodiment Construction

[0025] figure 1 and 2 One embodiment of an injector 100 is shown having a needle valve 102 with a tip 104 engaging a seat 106 in the injector body in a closed condition during injection events. In this closed condition, the needle control chamber 108 is supplied with high pressure fuel 110 from a high pressure feed pump (not shown), and similarly, the same high pressure fuel 110 is supplied to the annular surface 128 at an intermediate position on the needle. . Due to the area difference, the fluid pressure on the injection needle at the control chamber 108 is significantly higher than the fluid pressure at the upper end of the needle. As the net downward fluid force is counteracted by spring 112 in chamber 108 , the needle is maintained against seat 106 .

[0026] The flow passages 114 a, b connect the high pressure needle control chamber 108 with the control valve chamber 116 . The control valve 118 has a shank pin with a generally tapered sealing area which, when seated...

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PUM

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Abstract

A needle type fuel injector has a needle control chamber at a pressure subject to a control valve in a control valve chamber which in an opening phase is lifted from its seat to expose the control valve chamber, connecting passage, and needle control chamber to a low pressure drain and in a closing phase is urged against the seat to isolate the control valve chamber, connecting passage, and needle control chamber from the drain. The potential for cavitation at high fuel injection pressure is reduced by throttling the flow of fuel past the control valve seat when the control valve opens, thereby maintaining sufficient back pressure in the control valve chamber and upstream connecting passages.

Description

technical field [0001] The present invention relates to diesel engine fuel injectors in which pressure in a solenoid valve control chamber acts on a needle injection valve. Background technique [0002] In these types of injectors, the control valve acts as a normally closed valve in the control chamber to separate the fuel in the needle control chamber from the low pressure region and the associated flow path at high pressure. A spring or similar assembly on the solenoid armature or shaft pushes the shaped pin or similar assembly against a correspondingly shaped control housing mount. Injection activity begins with energization of the solenoid which lifts the control valve off the seat allowing high pressure fuel in the needle control chamber to communicate with the flow path to the low pressure area or tank and lifts the injector needle in the known manner Stand off the bottom of the injector body. The raised needle exposes the injection hole located at the tip of the bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D1/00
CPCF02M47/027F02M61/10F02M61/12F02M63/0005F02M63/0056F02M2200/04F02M2200/28
Inventor M·S·卡瓦纳
Owner 思达耐运营有限责任公司
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