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Pumps for scr systems 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: 2020-03-17
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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  • Pumps for scr systems in vehicles
  • Pumps for scr systems in vehicles
  • Pumps for scr systems in vehicles

Examples

Experimental program
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Embodiment Construction

[0043]The described pump is used in an SCR (Selective Catalytic Reduction System). With this pump, a urea solution is injected into the exhaust system before the SCR catalytic converter of diesel vehicles to reduce harmful nitrogen oxides in the exhaust gas, or to remove it. The urea solution is dosed by means of a pump or an injector, so that this nitrogen oxide is 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 housing 1. It has a central drive chamber 2 for the drive shaft 3 with a fixed eccentric disk 4 . The free end of the drive shaft 3 can rotate in a bearing 5 provided on the inner wall of the housing 1 . The drive shaft 3 protrudes from the drive chamber 2 and from the housing 1 through the mounting plate 6 . A motor 7 is connected to the mounting plate 6, which closes the drive chamber 2 to the outside, whose motor shaft is the drive shaft 3 and rotat...

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PUM

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Abstract

The invention relates to a pump for an SCR system in a vehicle, the pump having a housing in which at least one pump element is arranged, which is activated by an electric drive and has at least one pump piston and has at least one metal spring Said pump piston of the bellows is elastically deformable during operation of the pump.

Description

technical field [0001] The present invention relates to a pump for an SCR system in a vehicle. Background technique [0002] It is known to reduce at least the nitrogen oxides contained in the exhaust gases of vehicles with internal combustion engines by means of selective catalytic reduction systems (SCR processes). For this purpose, a 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. Also, precise doses of urea solution can be difficult to inject into the exhaust stream and difficult to mix. However, precise dosing is required for a reliable reduction of nitrogen oxides in the exhaust gas stream....

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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