Device for the suction filtration of fluids

Patent metadata

Field	Value
Publication number	US-9808749-B2
Application number	US-201314424211-A
Country	US
Kind code	B2
Filing date	Jul 25, 2013
Priority date	Aug 31, 2012
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A device for the suction filtration of fluids, such as urea solutions for exhaust gas after-treatment systems, has a tank ( 2 ) storing the fluid, and a filter element ( 34 ) arranged in the tank and provided with a filter medium ( 32 ) separating the tank contents from a clean-side inner filter cavity ( 20 ). The filter cavity extends from the bottom ( 10 ) of the tank ( 2 ) to a filling level height ( 28 ) and corresponds to a part of the filling volume of the tank ( 2 ). On the filter cavity ( 20 ), a suction connection ( 22 ) discharges the cleaned fluid by a suction pressure corresponding to a system operating pressure. The filter element ( 34 ) is provided with a filter medium ( 32 ), which is air-impermeable if suction pressures are within the range of a low system operating pressure.

First claim

The invention claimed is:

1. A device for suction filtration of fluids, the device comprising:
a tank storing a fluid to a filling level height corresponding to a part of a filling volume of said tank and having a bottom;
a filter element disposed in said tank, said filter element having a filter medium separating contents of said tank from a clean-side inner filter cavity inside said filter medium and extending from said bottom of said tank to the filling level height; and
a suction connection on said filter cavity discharging cleaned fluid from said filter cavity by suction pressures corresponding to system operating pressures said filter medium being air-impermeable within a range of the system operating pressures and the suction pressures, said suction connection being arranged at an end of said filter cavity spaced from said bottom of said tank.

2. A device according to claim 1 wherein
said suction connection is disposed at an upper end of said filter cavity remote from said bottom of said tank.

3. A device according to claim 1 wherein
said filter medium comprises melt-blown fiber material.

4. A device according to claim 3 wherein
said fiber material has plastic fibers.

5. A device according to claim 4 wherein
said plastic fibers are PA 66.

6. A device according to claim 1 wherein
said filter medium has a wall thickness in a range of 2 mm to 10 mm and a fineness of 5 μm to 30 μm.

7. A device according to claim 1 wherein
said filter medium has a wall thickness of 5 mm and a fineness of 10 μm.

8. A device according to claim 1 wherein
said fluid is a urea solution for exhaust gas after treatment systems.

9. A device for suction filtration of fluids, the device comprising:
a tank storing a fluid to a filling level height corresponding to a part of a filling volume of said tank and having a bottom;
a filter element disposed in said tank, said filter element having a filter medium separating contents of said tank from a clean side inner filter cavity inside said filter medium and extending from said bottom of said tank to the filling level height, said filter medium having melt-blow fiber material of PA 66 plastic fibers and having a filter fineness in a range of 5 μm to 30 μm; and
a suction connection on said filter cavity discharging cleaned fluid from said filter cavity by suction pressures corresponding to a system operating pressures, said filter medium being air-impermeable with a range of suction pressures.

10. A device according to claim 9 wherein
said filter fineness is 10 μm.

11. A device according to claim 9 wherein
said suction connection is disposed at an upper end of said filter cavity spaced from said bottom of said tank.

12. A device according to claim 9 wherein
said filter medium has a wall thickness in a range of 2 mm to 10 mm and a fineness of 5 μm to 30 μm.

13. A device according to claim 9 wherein
said filter medium has a wall thickness of 5 mm and a fineness of 10 μm.

14. A device according to claim 9 wherein
said fluid is a urea solution for exhaust gas after treatment systems.

Assignees

• Hydac Filtertechnik Gmbh

Inventors

• Sann Norbert
• Lauer Viktor Josef
• Hennes Stefan
• Sakraschinsky Michael
• Wohlers Alexander
• Seibold Paul

Classifications

• Y02T10/24

  Cross-Sectional Technologies · mapped topic

• B01D35/027 Primary

  rigidly mounted in or on tanks or reservoirs (B01D35/04 takes precedence) · CPC title

• B01D35/005 Primary

  Filters specially adapted for use in internal-combustion engine lubrication or fuel systems · CPC title

• F01N2610/02

  the substance being ammonia or urea · CPC title

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title