Pump assembly for use in selective catalytic reduction (SCR) system

A technology of SCR system and pump components, which is applied to the components of pumping devices for elastic fluids, pump elements, variable displacement pump components, etc., which can solve the problem that it is difficult to determine whether the cushion is properly aligned, and the cushion cannot be conventionally aligned. Issues such as inspection, increase in total pump component weight and manufacturing cost

Active Publication Date: 2021-08-31
DELPHI TECH IP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the related prior art, the mat is covered by a retaining plate, and therefore cannot be routinely inspected even when the housing cover is removed
This makes it difficult for someone (such as a mechanic) to determine if the matting is properly aligned and is providing adequate insulation for the pump assembly and / or filter assembly
Additionally, the need for a retainer plate in addition to the housing cover increases the overall weight and manufacturing cost of the pump assembly

Method used

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  • Pump assembly for use in selective catalytic reduction (SCR) system
  • Pump assembly for use in selective catalytic reduction (SCR) system
  • Pump assembly for use in selective catalytic reduction (SCR) system

Examples

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Embodiment Construction

[0035] A pump assembly for a selective catalytic reduction (SCR) system is described herein with reference to the accompanying figures. The pump assembly of the SCR system is housed within a housing located near the exhaust assembly of a compression ignition internal combustion engine (not shown) and is configured to deliver urea to a dosing module (not shown) for delivery of urea to Exhaust flow from the exhaust system.

[0036] To put embodiments of the invention into their proper context, reference will first be made to figure 1 and figure 2 , which shows a perspective view of the pump assembly housing (referred to as housing) 1 . The housing 1 includes a removable housing cover 12 (here shown attached to the housing 1 and referred to herein as the "top" cover), four side walls 11 and a housing base 13 ( figure 1 not visible in ). The housing 1 comprises a fluid outlet 14 on one side wall 11 . Fluid outlet 14 allows the pump assembly to interface with and deliver urea...

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Abstract

The present invention relates to a pump assembly for use in a selective catalytic reduction (SCR) system of a compression ignition internal combustion engine. The pump assembly comprises a housing (1), a pump (19) located within the housing (1) and for pressurising urea to be delivered by the dosing system, a filter (20) located within the housing (1) and for filtering urea to be drawn by the pump (19) prior to pressurisation, and a heating system including a rigid cover (24) for both the pump (19) and the filter (20). The rigid cover (24) is provided with an integrated fixing means to enable the attachment of the rigid cover (24) to the housing (1).

Description

technical field [0001] The present disclosure relates to a pump assembly for a selective catalytic reduction (SCR) dosing system. Aspects of the invention relate to a pump assembly and an SCR dosing system including the pump assembly. Background technique [0002] Selective catalytic reduction (SCR) is a means of converting nitrogen oxides (NOx) into diatomic nitrogen (N2) and water (H2O) with the aid of a catalyst. In an SCR dosing system, a "dose" of a gaseous reductant, such as urea, is injected into the flue or exhaust gas stream produced by a compression ignition internal combustion engine. SCR dosing systems are commonly implemented in diesel fueled engines, where an SCR pump assembly pumps a dose of pressurized filtered urea into the exhaust stream. Since urea has a relatively high freezing temperature (ie -11° C.), there is a risk that it will freeze within the SCR pump assembly at low temperatures, especially when within the filter components and pump assembly com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F04B53/08F04B53/20
CPCF01N3/2066F01N2610/02F01N2610/1433F01N2610/1426F01N2610/10F04B53/20F04B53/08Y02T10/12F01N3/206F01N3/208F01N2610/1486
Inventor 周林王飞史建
Owner DELPHI TECH IP LTD
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