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Pump for a selective catalytic reduction (SCR) system in vehicles

A technology of SCR system and vehicle, applied in parts of pumping devices for elastic fluids, pumps with flexible working elements, pumps, etc., can solve difficult mixing, no long life, difficult injection of urea solution into exhaust gas flow, etc. problem, achieving long service life, reduced unusable volume, longevity and optimal accuracy

Active Publication Date: 2016-10-26
贝恩德·尼特哈默尔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But they are not reliable, so when used in the SCR system of a vehicle, they don't have a long life
Also, precise dosing of urea solution can be difficult to inject into the exhaust stream and difficult to mix
But precise dosing is required for a reliable reduction of nitrogen oxides in the exhaust gas stream

Method used

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  • Pump for a selective catalytic reduction (SCR) system in vehicles
  • Pump for a selective catalytic reduction (SCR) system in vehicles
  • Pump for a selective catalytic reduction (SCR) system in vehicles

Examples

Experimental program
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Embodiment Construction

[0043] The described pump is used for SCR (Selective Catalytic Reduction System). With this pump, the urea solution is injected into the exhaust system before the SCR catalytic converter of the diesel vehicle to reduce harmful nitrogen oxides in the exhaust, or to remove it. The urea solution is dosed through a pump or an ejector, so that the nitrogen oxides are reliably removed from the exhaust gas or greatly reduced, so that they do not constitute an impact on the environment.

[0044] according to figure 1 The pump has a housing 1. It has a central drive chamber 2 for the drive shaft 3, which has a fixed eccentric disk 4. The free end of the drive shaft 3 can be rotated in a bearing 5 provided on the inner wall of the housing 1. The drive shaft 3 extends from the drive chamber 2 and from the housing 1 through the mounting plate 6. The motor 7 is connected to the mounting plate 6, which closes the drive chamber 2 to the outside, its motor shaft is the drive shaft 3, and rota...

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PUM

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Abstract

A pump for a SCR system in vehicles which includes a housing in which at least one pump element is arranged which is activated by a eccentric drive and has at least one a pump piston. The at least one pump piston includes at least a spring bellow which is elastically deformable during pump operation.

Description

Technical field [0001] The invention relates to a pump for an SCR system in a vehicle according to the preamble of claim 1 of this patent. Background technique [0002] It is known that at least nitrogen oxides contained in exhaust gas of internal combustion engine vehicles are reduced by a selective catalytic reduction system (SCR process). For this purpose, the urea solution will be injected into the exhaust gas stream in a fine dosing step to reduce nitrogen oxides. Due to the chemical reaction with the urea solution, nitrogen oxides are converted into nitrogen and water. Pumps are used to pump urea solutions, such as piston pumps, rubber diaphragm pumps, gear pumps, rail and hose pumps. But they are not reliable, so when used in a vehicle's SCR system, they do not have a long life. Moreover, the precise dose of the urea solution may be difficult to inject into the exhaust gas stream and difficult to mix. However, for a reliable reduction of nitrogen oxides in the exhaust ...

Claims

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Application Information

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IPC IPC(8): F04B43/08F04B13/00F04B9/04F01N3/20
CPCF01N3/206F04B9/045F04B13/00F04B43/084F04B43/086F01N2610/1433F01N2610/02F01N2570/14F01N3/2066F04B17/03F04B43/08Y02A50/20Y02T10/12F04B19/22F04B49/16F04B53/14F04B53/16
Inventor 贝恩德·尼特哈默尔
Owner 贝恩德·尼特哈默尔
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