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Injection device for injecting fluid

A technology of injection device and injector, which is applied in the direction of fuel injection device, noise reduction device, exhaust device, etc., can solve problems such as clogged injector and damage, and achieve the effect of effective freezing protection mode

Active Publication Date: 2016-04-27
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, it must be taken into account that fluids also freeze at low temperatures, thus causing damage and / or clogging of syringes due to volume expansion

Method used

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  • Injection device for injecting fluid
  • Injection device for injecting fluid
  • Injection device for injecting fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] figure 1 An injection device 1 according to the invention is shown having a syringe 2 arranged in a syringe holder 3 . The syringe 2 has electrical terminals 18 , to which control signals for opening and closing the syringe 2 can be introduced. The syringe 2 has a supply opening 4 into which the part 5 of the insert 9 extends. The insert 9 is arranged together with the syringe 2 in the syringe holder 3 via a spring 11 . The spring 11 is preferably a leaf spring. The upper region of the syringe holder 3 is formed by a cap 16 . The insert 9 forms a supply duct 10 through which fluid can flow into the syringe 2 , or into the supply opening 4 of the syringe 2 .

[0050] The syringe 2 and the insert 9 are sealed against the surrounding environment by an O-ring seal 17 .

[0051] For illustrative purposes, the direction parallel to the supply opening 4 is the longitudinal direction 23 and the direction perpendicular to said longitudinal direction is the radial direction ...

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PUM

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Abstract

The invention relates to an injection device (1) for injecting a fluid into an exhaust gas treatment device (15), having a syringe (2) arranged in a syringe holder (3), wherein the syringe (2) has a supply opening ( 4), and the part (5) of the syringe holder (3) extends into the supply opening (4). An injection device (1) of this type is particularly suitable for feeding urea / water solution into an exhaust gas treatment device (15) of a motor vehicle. The part ( 5 ) is preferably rigid in the longitudinal direction ( 23 ) and compressed in the radial direction ( 24 ) by a deformable rubber casing to compensate for volume expansion of the solution if it freezes.

Description

technical field [0001] The invention relates to an injection device for injecting a fluid into an exhaust gas treatment device, which has a syringe arranged in a syringe holder. Background technique [0002] It is known that, for the purpose of cleaning the exhaust gas of an internal combustion engine, fluids can be supplied to exhaust gas treatment devices in a targeted manner, for example to effect a chemical conversion of exhaust gas components. Said type of fluid is, for example, an oxidizing or reducing agent. As fluid, in particular an aqueous urea solution is used. In particular, a 32.5% aqueous urea solution commonly used to reduce harmful nitrogen oxides in exhaust gases is available, for example, under the trade name Get it below. With aqueous urea solutions of the described type, it is possible to carry out a selective catalytic reduction [SCR] process in exhaust gas treatment plants. Metering of the fluid can be done by means of an injection device with a sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20
CPCF01N3/2066F01N2610/02F01N2610/1446F01N2610/1453F01N2610/1486F02M61/14F01N2610/1466F01N2610/11Y02A50/20Y02T10/12F01N3/20F01N3/24
Inventor 简·霍奇森斯文·舍佩尔斯
Owner VTESCO TECH GMBH