Pumping device for a waste heat recovery apparatus in a motor vehicle

Patent metadata

Field	Value
Publication number	US-10280905-B2
Application number	US-201515514289-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Sep 25, 2014
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A pumping device may include a pump housing partially delimiting a working chamber, and a piston arranged therein, axially movable between first and second positions in which the working chamber has maximum and minimum volumes, respectively. The pumping device may include first and second fluid lines for introducing and discharging fluid to/from the working chamber, respectively. The first fluid line may be fluidically connected to the working chamber via a breakthrough formed in the pump housing at an end face of the working chamber opposite the piston, running transversely to the axial direction at least in the area of the breakthrough. The second fluid line may open obliquely into the working chamber in an area of the second position, relative to the axial direction in an end face delimiting the working chamber towards the first fluid line.

First claim

The invention claimed is:

1. A pumping device for a waste heat recovery apparatus of a motor vehicle, comprising:
a pump housing partially delimiting a working chamber that is fillable with a fluid;
a piston arranged in the working chamber and movable along an axial direction between a first position where the working chamber has a maximum volume and a second position where the working chamber has a minimum volume;
a first fluid line for introducing the fluid into the working chamber;
the first fluid line fluidically connected to the working chamber via a breakthrough disposed in the pump housing at an end face of the working chamber opposite the piston;
a first valve element for a fluid-tight closure of the first fluid line with respect to the working chamber provided in an area of the breakthrough in the first fluid line;
wherein the first fluid line extends transversely to the axial direction at least in the area of the breakthrough;
a fluid supply line for introducing the fluid into the first fluid line, the fluid supply line arranged to open tangentially into the first fluid line, where, from a top view of the pumping device, a centerline of the fluid supply line is tangential to a centerline of the first fluid line;
a second fluid line for discharging the fluid from the working chamber, the second fluid line arranged to open into the working chamber in an area of the second position of the piston;
a second valve element for a fluid-tight closure of the second fluid line with respect to the working chamber provided in an opening area of the second fluid line into the working chamber;
wherein the second fluid line opens obliquely into the working chamber relative to the axial direction;
wherein the second valve element communicates fluidically with the working chamber directly without defining an intermediate space;
wherein the second fluid line opens into the working chamber in an axial end section of the working chamber towards the first fluid line;
wherein the pump housing includes a circumferential wall providing a circumferential-side delimitation of the working chamber and an end wall providing an end-face-side delimitation of the working chamber towards the first fluid line, and the second fluid line has an opening orifice disposed in at least one of the circumferential wall and the end wall;
wherein the second valve element is structured and arranged to open and close the opening orifice of the second fluid line and define part of at least one of the circumferential-side delimitation and the end-face-side delimitation; and
wherein the first fluid supply line opens obliquely into the first fluid line.

2. The pumping device according to claim 1 , wherein the first fluid line extends in the area of the breakthrough in a plane perpendicular to the axial direction and has a curved portion at least in the area of the breakthrough.

3. The pumping device according to claim 2 , wherein the first fluid line is configured as a closed annular fluid channel that extends completely in the plane perpendicular to the axial direction.

4. The pumping device according to claim 1 , wherein the first valve element projects at least partially from the first fluid channel through the breakthrough and into the working chamber.

5. The pumping device according to claim 1 , wherein the first valve element is arranged completely in the working chamber and communicates fluidically via the breakthrough directly with the first fluid line.

6. The pumping device according to claim 1 , wherein the first fluid line provides an extension of the working chamber along the axial direction.

7. The pumping device according to claim 1 , wherein the first valve element is a non-return valve adjustable between an open position and a closed position, wherein the non-return valve is adjusted from the closed position into the open position when the fluid pressure in the first fluid line is greater than in the working chamber and the pressure difference between the fluid in the working chamber and the fluid in the first fluid line exceeds a predetermined threshold value.

8. The pumping device according to claim 1 , wherein the first valve element is a non-return valve adjustable to open and close the breakthrough, and wherein the first valve element is arranged to communicate fluidically via the breakthrough directly with the first fluid line without defining an intermediate space.

9. The pumping device according to claim 1 , wherein the opening orifice of the second fluid line is disposed in a transition region between the circumferential wall and the end wall, and wherein the second valve element defines part of the circumferential-side delimitation and the end-face-side delimitation of the working chamber.

10. The pumping device according to claim 1 , wherein the second valve element ends substantially flush with the at least one of the circumferential wall and the end wall.

11. A pump arrangement, comprising:
a pump housing;
a plurality of pumping devices disposed in the pump housing, the plurality of pumping devices respectively including:
a working chamber at least partially delimited by the pump housing that is fillable with a fluid;
a piston arranged in the working chamber and movable along an axial direction between a first position where the working chamber has a maximum volume and a second position where the working chamber has a minimum volume;
a first fluid line for introducing the fluid into the working chamber;
a breakthrough disposed in the pump housing fluidically connecting the first fluid line to the working chamber, the breakthrough disposed in the pump housing at an end face of the working chamber opposite the piston, wherein the first fluid line extends transversely to the axial direction at least in an area of the breakthrough;
a first valve element for a fluid-tight closure of the first fluid line with respect to the working chamber provided in the area of the breakthrough in the first fluid line;
a fluid supply line for introducing the fluid into the first fluid line, the fluid supply line arranged to open tangentially into the first fluid line, where, from a top view of the pump arrangement, a centerline of the fluid supply line is tangential to a centerline of the first fluid line;
a second fluid line for discharging the fluid from the working chamber, the second fluid line arranged to open into the working chamber in an area of the second position of the piston, wherein the second fluid line opens obliquely into the working chamber relative to the axial direction;
a second valve element for a fluid-tight closure of the second fluid line with respect to the working chamber provided in an opening area of the second fluid line into the working chamber, the second valve element communicating fluidically with the working chamber directly without defining an intermediate space;

wherein the second fluid line opens into the working chamber at an axial end section of the working chamber towards the first fluid line;
wherein the working chambers of the plurality of pumping devices define an arrangement with each of the breakthroughs arranged parallel to one another in relation to the axial direction;
wherein the arrangement of the working chambers with the breakthroughs has a 120° rotational symmetry in a cross-section perpendicular to the axial direction in relation to a predefined symmetry point;
wherein the first fluid lines of the plurality of pumping devices define a common annular fluid channel with the predefined symmetry point providing an annular centre point of the annular fluid channel; and
wherein the first fluid supply line opens obliquely into the first fluid line.

Assignees

• Mahle Int Gmbh

Inventors

• Eggler Jochen
• Elsaesser Alfred
• Ladisch Helge
• Maisch Christian
• Senjic Sascha

Classifications

• F04B53/10

  Valves; Arrangement of valves · CPC title

• F03C1/06

  with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis · CPC title

• F04B11/0091

  using a special shape of fluid pass, e.g. throttles, ducts · CPC title

• F04B1/12 Primary

  having cylinder axes coaxial with, or parallel or inclined to, main shaft axis · CPC title