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Injector for reductant delivery unit having fluid volume reduction assembly

A technology of fluid injectors and delivery units, applied in the direction of gas chambers, gas passages, engine components, etc., can solve the problem of reducing agent damage

Active Publication Date: 2019-03-22
VITESCO TECH USA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the vehicle engine is turned off in a non-scavenging SCR system, the RDU injector remains filled with reductant, making the RDU injector vulnerable to damage from reductant expansion under freezing conditions

Method used

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  • Injector for reductant delivery unit having fluid volume reduction assembly
  • Injector for reductant delivery unit having fluid volume reduction assembly
  • Injector for reductant delivery unit having fluid volume reduction assembly

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Embodiment Construction

[0027] The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application or uses.

[0028] Exemplary embodiments generally relate to RDUs for non-scavenging SCR systems in which the damaging effects of freezing of reductant, DEF, and / or urea solutions in the RDU injectors are reduced.

[0029] figure 1 An RDU 10 of a non-scavenging SCR system is shown, according to an exemplary embodiment. The RDU 10 includes a solenoid fluid injector, indicated generally at 12, which provides the metering function of the fluid and, in dosing applications, the preparation of a spray of the fluid into the exhaust path of the vehicle. Accordingly, fluid injector 12 is constructed and arranged to be associated with an exhaust flow path upstream of a selective catalytic reduction (SCR) catalytic converter (not shown). Fluid injector 12 may be an electric solenoid fuel injector. Such as figure 1 with figure...

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Abstract

A fluid injector, including a fluid inlet, a fluid outlet and a fluid path from the fluid inlet to the fluid outlet; a tube having an end at the fluid inlet; a filter disposed in the tube proximal tothe fluid inlet; and a volume reduction member disposed in the tube downstream of the filter, contacting an inner surface of the tube and including a through-bore defining at least a portion of the fluid path, the bore having a smaller diameter than an inner diameter of the tube and the volume reduction member occupying a volume in the tube such that the volume reduction member reduces an amount of space for fluid in the fluid injector. A cap member, in which the filter is disposed, engages with the volume reduction member such that the filter, the volume reduction member and the cap form a single assembly member.

Description

[0001] Cross References to Related Applications [0002] This application is related to U.S. Patent Application __ entitled "INJECTOR FOR REDUCTANT DELIVERY UNIT HAVING REDUCED FLUIDVOLUME" (Attorney Docket No.: 2017P03658US), and U.S. Patent Application _ entitled "SEAL MEMBER FOR REDUCTANT DELIVERY UNIT" (Attorney Docket No.: 2017P03660US) _, and U.S. Patent Application __ entitled "INJECTOR FORREDUCTANT DELIVERY UNIT HAVING FLUID VOLUME REDUCTION ASSEMBLY" (Attorney Docket No.: 2017P03661US). The content of the above application is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates generally to fluid injectors for reductant delivery units (RDUs), and in particular to rugged RDU fluid injectors for non-scavenging applications. Background technique [0004] Emissions regulations in Europe and North America are driving the implementation of new exhaust aftertreatment systems, especially for engines such as compression-ig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20
CPCF01N3/206F01N2610/1453F01N2530/18F01N2610/02Y02T10/12F01N3/2066F01N3/2896F01N2610/1433
Inventor S.C.巴戈斯J.L.哈特菲尔德
Owner VITESCO TECH USA