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Ejector water intrusion seal with blowout volume

A technology of injectors and fluid injectors, which is applied in the direction of fuel injection devices, special fuel injection devices, machines/engines, etc., and can solve problems such as hindering the effectiveness test of the main O-ring 12 and injector failure

Active Publication Date: 2018-05-15
VITESCO TECH USA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the secondary seal was found to interfere with the effectiveness testing of the primary O-ring 12
Failure of the main O-ring 12 will force the AUS32 (urea, by image 3 Indicated by the arrow in ) into the interior 16 of the injector 10, causing premature failure of the injector

Method used

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  • Ejector water intrusion seal with blowout volume
  • Ejector water intrusion seal with blowout volume
  • Ejector water intrusion seal with blowout volume

Examples

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Embodiment Construction

[0019] The following description of the preferred embodiments is merely exemplary in nature and in no way intended to limit the invention, its application or uses.

[0020] refer to Figure 4 and 6 , shows a fluid injector, generally indicated at 10', in accordance with an embodiment. The injector 10' is constructed and arranged as a reductant delivery unit (RDU) for a selective catalytic reduction (SCR) system. Such as Figure 6 As shown, injector 10' includes an inlet cup assembly having an inlet cup 20 coupled to a cup tube 22 defining an inlet of injector 10'. Cup 22 is constructed and arranged to connect to a source of fluid, such as urea, for introduction into injector 10'. Inlet cup 20 is connected to shield 14 , and shield 24 generally surrounds housing 26 , which includes electrical connectors 28 . Figure 4 The inlet cup assembly or shield 14 is not shown so that the underlying components can be clearly seen.

[0021] A portion of the inlet tube 30 is disp...

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Abstract

The present invention relates to an injector water intrusion seal having a burst volume. The fluid injector includes a housing and a portion of an inlet tube received in the housing. The primary seal forms a seal between the inlet of the injector, the inlet tube, and the surface of the housing. A groove is in the housing and a secondary seal is in the groove to define a seal between a portion of the inlet of the injector and the housing. A recessed portion is defined in the housing and communicates with the groove. The recessed portion defines a burst volume such that when the primary seal is leak tested, as pressurized air moves past the primary seal and forces a portion of the secondary seal to an unsealed position into the burst volume, An indication of a leak in the primary seal can be detected.

Description

[0001] This application claims priority to US Provisional Patent Application No. 61 / 901,504, filed November 8, 2013, the contents of which are incorporated herein by reference. technical field [0002] The present invention relates generally to secondary seals for preventing liquid from entering an injector, and more particularly to a burst volume receivable for a portion of the secondary seal. Background technique [0003] refer to figure 1 and 2 , a fluid injector, shown generally at 10, used as a reductant delivery unit (RDU) in a selective catalytic reduction (SCR) system, including a main o-ring 12 to seal urea introduced into the injector 10 and prevent Liquid (eg, water) invades the interior 16 of the injector 10 . Even with the main seal 12, as figure 2 As shown by the arrow in , water can intrude through the injector shield 14 and move below the main O-ring 12 and into the interior 16 of the injector 10 (between the housing 26 and the inlet tube 30 ). The intru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/28
CPCF02M65/006F02M55/005F02M2200/16F01N2610/02F01N2610/1453Y10T29/494F01N3/2066F02M61/168
Inventor R.W.麦克法兰
Owner VITESCO TECH USA
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