Connecting piece for fluid lines of an exhaust-gas aftertreatment system

Patent metadata

Field	Value
Publication number	US-10968801-B2
Application number	US-201816646235-A
Country	US
Kind code	B2
Filing date	Jul 16, 2018
Priority date	Sep 11, 2017
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

The invention relates to a connecting piece (6) for fluid lines of an exhaust gas aftertreatment system (1), comprising a hollow body (6a) having at least three fluid connection points (14, 15), which are fluidically connected to each other in the hollow body (6a), at least two of the fluid connection points (15) being separated from a third fluid connection point (14) by means of respective membranes (19), each membrane (19) being permeable to a liquid and, when wetted by the liquid, being impermeable to a gas.

First claim

The invention claimed is:

1. A connecting piece ( 6 ) for fluid lines of an exhaust-gas aftertreatment system ( 1 ), the connecting piece comprising a hollow body ( 6 a ) having at least three fluid ports ( 14 , 15 ) connected to one another in a fluid-conducting manner in the hollow body ( 6 a ), characterized in that at least two of the fluid ports ( 15 ) are separated from a third one of the fluid ports ( 14 ) by in each case one respective membrane ( 19 ) that is permeable to a liquid and, in a state wetted by the liquid, is impermeable to a gas.

2. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) has a bubble point pressure p of 20 to 100 mbar.

3. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) has a pore size greater than 25 μm.

4. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) is arranged at an angle of less than 90° to a flow direction of the respective fluid port ( 14 , 15 ).

5. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) is formed from a thermoplastic.

6. The connecting piece ( 6 ) as claimed in claim 1 , claim, characterized in that the connecting piece ( 6 ) has exactly three fluid ports ( 14 , 15 ).

7. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the connecting piece ( 6 ) is a T-piece or Y-piece.

8. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) is arranged inclined to a flow direction of the respective fluid port ( 14 , 15 ).

9. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) is arranged perpendicular to a flow direction of the respective fluid port ( 14 , 15 ).

10. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that all of the fluid ports ( 14 , 15 ) apart from the third one of the fluid ports have in each case one membrane ( 19 ), wherein the third one of the fluid ports, without a membrane, is a main port ( 14 ).

11. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that all of the fluid ports ( 14 , 15 ) have in each case one membrane ( 19 ).

12. A dosing system ( 2 ) for dosing a liquid into a system, the dosing system comprising at least one conveying device ( 5 ), a main line ( 13 ), at least two fluid lines ( 16 ) and at least two dosing valves ( 17 ), wherein the main line ( 13 ) is connected in a fluid-conducting manner to the at least one conveying device ( 5 ), and wherein the at least two fluid lines ( 16 ) are connected in a fluid-conducting manner to in each case one of the dosing valves ( 17 ), characterized in that the main line ( 13 ) is connected in a fluid-conducting manner to the at least two fluid lines ( 16 ) by way of a connecting piece ( 6 ) as claimed in claim 1 .

13. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) has a bubble point pressure p of 35 to 100 mbar.

14. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) has a pore size greater than 40 μm.

15. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) is arranged at an angle of 70° to a flow direction of the respective fluid port ( 14 , 15 ).

16. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) is formed from a polyolefin or polypropylene or a polyamide.

17. The connecting piece ( 6 ) as claimed in claim 1 , characterized in that the respective membrane ( 19 ) is formed from polyamide 6.6.

Assignees

• Bosch Gmbh Robert

Inventors

• Hoeffken Tobias
• Chaineux Marc

Classifications

• F01N2610/1493

  Purging the reducing agent out of the conduits or nozzle · CPC title

• F01N2610/1453

  Sprayers or atomisers; Arrangement thereof in the exhaust apparatus · CPC title

• F01N2610/144

  Control thereof · CPC title

• F01N2610/02

  the substance being ammonia or urea · CPC title

• F01N3/208 Primary

  Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent · CPC title