Pump for pumping a liquid

• US 20160146078A1
• Filed: 05/19/2014
• Published: 05/26/2016
• Est. Priority Date: 06/13/2013
• Status: Active Grant

• Current Assignee: Vitesco Technologies GmbH (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Continental Automotive GmbH (Continental AG)
• Inventors: Br?ck, Rolf, Hodgson, Jan
• Granted Patent: US 10,393,102 B2
• Time in Patent Office: Days
• CPC Class Codes: F01N 2610/02 the substance being ammonia or urea
• CPC Class Codes: F01N 2610/1433 Pumps
• CPC Class Codes: F01N 2610/144 Control thereof
• CPC Class Codes: F01N 3/206 Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents F01N3/2066 takes precedence
• CPC Class Codes: F01N 3/2066 Selective catalytic reduction [SCR]
• CPC Class Codes: F04B 43/0054 particularities of the flexible members
• CPC Class Codes: F04B 43/0081 systems, control, safety measures
• CPC Class Codes: F04B 43/12 having peristaltic action
• CPC Class Codes: F04B 43/123 using an excenter as the squeezing element
• CPC Class Codes: F04B 43/14 having plate-like flexible members
• CPC Class Codes: F04C 15/0015 of resilient material
• CPC Class Codes: F04C 15/0065 for eccentric movement
• CPC Class Codes: F04C 5/00 Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable such pumps specially adapted for elastic fluids F04C18/00
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A pump for pumping a liquid has a pump housing with at least one inlet and at least one outlet. The pump housing has an eccentric rotatable relative to the pump housing by an axle. A deformable element is arranged between the pump housing and the eccentric, and by the deformable element, at least one pump path from the at least one inlet to the at least one outlet is delimited and at least one movable pump path seal is formed, which separates at least one closed pump volume in the pump path. The at least one movable seal is movable in a pump direction from the inlet to the outlet by a movement of the eccentric to pump the fluid along the pump path. The pump has at least one adjustable axial calibrating device, by which the deformable element is clamped in the axial direction parallel to the axle.

Claims

1-14. -14. (canceled)

15. A pump (1) that delivers a liquid, the pump (1) comprising:

a pump housing (2) with at least one inlet (3) and at least one outlet (4);

an eccentric (5) arranged on the pump housing (2), the eccentric (5) being rotatable about an axis (6) relative to the pump housing (2);

a deformable element (7) arranged between the pump housing (2) and the eccentric (5), the deformable element (7) delimiting at least one delivery path (8) from the at least one inlet (3) to the at least one outlet (4) and forming at least one displaceable seal (9) of the delivery path (8), which at least one displaceable seal separates off at least one closed pump volume (10) in the delivery path (8); and

at least one adjustable axial calibration device (12) by which the deformable element (7) is braced in an axial direction (13) parallel to the axis (6),

wherein, by a movement of the eccentric (5), the at least one displaceable seal (9) is displaceable in a delivery direction (11) from the inlet (3) to the outlet (4) to deliver the liquid along the delivery path (8).

16. The pump (1) as claimed in claim 15, wherein the deformable element (7) comprises a hose (17) arranged in an arcuate gap (18) between the eccentric (5) and the pump housing (2), the hose (17) connecting the inlet (3) to the outlet (4).

17. The pump (1) as claimed in claim 15, wherein the deformable element (7) comprises a deformable diaphragm (19), and the delivery path (8) between the at least one inlet (3) and the at least one outlet (4) is delimited by the pump housing (2) and by the deformable diaphragm (19).

18. The pump (1) as claimed in claim 15, further comprising abutment surfaces (14) having a spacing (41), wherein the deformable element (7) bears, at both sides in the axial direction (13), against the abutment surfaces (14), wherein the spacing (41) of the abutment surfaces (14) is adjustable by the axial calibration device (12).

19. The pump (1) as claimed in claim 15, wherein the axial calibration device (12) comprises a central calibration screw fitting (15) by which the deformable element (7) is braced in the axial direction (13).

20. The pump (1) as claimed in claim 15, wherein the axial calibration device (12) comprises a multiplicity of screw fittings (16) respectively arranged on a circle (34) about the axis (6).

21. The pump (1) as claimed in claim 15, further comprising, between the outlet (4) and the inlet (3), a static seal (25) by which a backflow of liquid counter to the delivery direction (11) is prevented.

28. A motor vehicle (22) comprising an internal combustion engine (23), an exhaust-gas treatment device (24) for the purification of the exhaust gases of the internal combustion engine (23), and a device (40) for metering a liquid for exhaust-gas purification into the exhaust-gas treatment device (24), having a pump (1) as claimed in claim 15.

22. A method for producing a calibrated pump for delivering a liquid, the method comprising:

a) providing a pump (1) having a pump housing (2) with at least one inlet (3) and at least one outlet (4);

an eccentric (5) arranged on the pump housing (2), the eccentric (5) being rotatable about an axis (6) relative to the pump housing (2);

a deformable element (7) arranged between the pump housing (2) and the eccentric (5), the deformable element (7) delimiting at least one delivery path (8) from the at least one inlet (3) to the at least one outlet (4) and forming at least one displaceable seal (9) of the delivery path (8), which at least one displaceable seal separates off at least one closed pump volume (10) in the delivery path (8); and

at least one adjustable axial calibration device (12) by which the deformable element (7) is braced in an axial direction (13) parallel to the axis (6), wherein, by a movement of the eccentric (5), the at least one displaceable seal (9) is displaceable in a delivery direction (11) from the inlet (3) to the outlet (4) to deliver the liquid along the delivery path (8);

b) exerting an axial force (35) on the deformable element (7) in the axial direction (13); and

c) affixing a calibration component (20) to the pump such that the axial force (35) is permanently maintained.

23. The method as claimed in claim 22, wherein, in step c), the pump housing (2) is connected to the calibration component (20) by a welded connection (21).

24. The method as claimed in claim 22, further comprising heating the pump (1) at least during one of the two steps b) and c).

25. The method as claimed in claim 22, further comprising generating a positive pressure in the delivery path (8) at least during one of the two steps b) and c).

26. The method as claimed in claim 22, wherein the exerting in step b) is performed for a minimum time period of at least 5 seconds before the affixing in step c) is performed.

27. The method as claimed in claim 22, wherein, during step b), the eccentric (5) is moved and the pump (1) delivers liquid, wherein the delivery rate of the pump (1) is monitored, and the axial force (35) is adapted if the delivery rate of the pump (1) does not correspond to a predefined delivery rate.

29. A motor vehicle (22) comprising an internal combustion engine (23), an exhaust-gas treatment device (24) for the purification of the exhaust gases of the internal combustion engine (23), and a device (40) for metering a liquid for exhaust-gas purification into the exhaust-gas treatment device (24), having a calibrated pump as claimed in claim 22.