TURBOMACHINES HAVING GUIDE DUCTS

• US 20140234094A1
• Filed: 04/30/2014
• Published: 08/21/2014
• Est. Priority Date: 11/03/2011
• Status: Active Grant

• Current Assignee: Dürr Cyplan Ltd.
• Original Assignee: Dürr Cyplan Ltd.
• Inventors: Eckert, Frank
• Granted Patent: US 9,982,539 B2
• Time in Patent Office: Days
• US Class Current: 415/186
• CPC Class Codes: F01D 1/026 Impact turbines with buckets, i.e. impulse turbines, e.g. Pelton turbines F01D1/16, F01D1/34 take precedence
• CPC Class Codes: F01D 1/06 traversed by the working-fluid substantially radially
• CPC Class Codes: F01D 1/08 having inward flow
• CPC Class Codes: F01D 25/30 Exhaust heads, chambers, or the like

Abstract

Turbomachines having guide ducts are disclosed. One disclosed example turbomachine includes a rotor rotatable about an axis of rotation and having rotor blade ducts, a housing having housing ducts to allow the inflow or outflow of working medium and guide blade ducts fixed in the housing, where the rotor blade ducts are in fluid communication with the housing ducts via the guide blade ducts.

Claims

1. A turbomachine comprising:

a housing having a housing duct for the inflow or outflow of working medium, and

a rotor positioned to be rotatable about an axis of rotation and having a multiplicity of rotor blades that define rotor blade ducts, wherein the rotor blade ducts fluidly communicate with the housing duct via guide blade ducts that are fixed in relation to the housing and have a guide blade duct opening on the rotor side and a guide blade duct opening on the housing duct side.

2. The turbomachine as defined in claim 1, wherein the guide blade ducts have a concave wall surface that faces the rotor and which working medium can flow against.

3. The turbomachine as defined in claim 1, wherein the guide blade ducts have a convex wall surface that faces away from the rotor and which working medium can flow against.

4. The turbomachine as defined in claim 1, wherein the guide blade ducts have a constriction and a divergent cross section between the constriction and the guide blade duct opening on the rotor side.

5. The turbomachine as defined in claim 4, wherein the guide blade ducts have a convergent cross section between the constriction and the guide blade duct opening on the housing duct side.

6. The turbomachine as defined in claim 4, wherein the guide blade ducts have a width that increases from the constriction toward the guide blade duct opening on the rotor side in a plane perpendicular to the axis of rotation in a region between the guide blade duct opening on the housing duct side and the guide blade duct opening on the rotor side.

7. The turbomachine as defined in claim 4, wherein the guide blade ducts have a height that increases from the constriction toward the guide blade duct opening on the rotor side in relation to a plane perpendicular to the axis of rotation between the guide blade duct opening on the housing duct side and the guide blade duct opening on the rotor side.

8. The turbomachine as defined in claim 1, wherein the guide blade ducts each have a center line spaced apart uniformly from a wall surface facing the rotor and a wall surface facing away from the rotor, the center line dividing the cross-sectional profile of a guide blade duct into a segment on the housing duct side and a segment on the rotor side, wherein the cross-sectional profile of each guide blade duct is asymmetrical in relation to the center line.

9. The turbomachine as defined in claim 8, wherein the segment on the housing duct side and the segment on the rotor side each have a free cross-sectional area for the passage of working medium, and wherein the free cross-sectional area of the segment on the rotor side is larger than the free cross-sectional area of the segment on the housing duct side.

10. The turbomachine as defined in claim 1, wherein the guide blade duct openings on the housing duct side lie on a cylindrical circumferential surface positioned coaxially with the axis of rotation, and the guide blade ducts guide the working medium in the center with a flow path that passes through the cylinder circumferential surface at a point of intersection at which the tangent to the flow path and the tangent to the cylinder circumferential surface form an angle α

1 to which the following applies;

5°

≦

α

1≦

20°

, wherein the tangent to the cylinder circumferential surface lies in a plane perpendicular to the axis of rotation.

11. The turbomachine as defined in claim 1 wherein the guide blade duct openings are located in an outward circumference of the rotor.

12. The turbomachine as defined in claim 1, wherein the guide blade duct openings on the rotor side lie on a cylinder circumferential surface positioned coaxially with the axis of rotation and guide the working medium in the center with a flow path that passes through the cylinder circumferential surface at a point of intersection at which the tangent to the flow path and the tangent to the cylinder circumferential surface form an angle α

2 to which the following applies;

5°

≦

α

2≦

20°

, wherein the tangent to the cylinder circumferential surface lies in a plane perpendicular to the axis of rotation.

13. The turbomachine as defined in claim 10, wherein the rotor blades have a substantially crescent-shaped cross-sectional contour and a concave blade surface that extends from a first blade edge, which faces the guide blade ducts, to a second blade edge, which faces away from the guide blade ducts, wherein a tangent lying in a plane perpendicular to the axis of rotation and applied to the concave blade surface at the first blade edge forms an obtuse angle {tilde over (β

)}{tilde over (β

1)};

β

1+90°

with a straight line that passes through the first blade edge and perpendicularly intersects the axis of rotation, wherein 5°

≦

{tilde over (β

)}{tilde over (β

1)}−

90°

≦

45°

.

14. The turbomachine as defined in claim 13, wherein a tangent lying in a plane perpendicular to the axis of rotation and applied to the concave blade surface at the second blade edge forms an acute angle {tilde over (β

)}{tilde over (β

2)};

=90°

−

β

2 with a straight line that passes through the second blade edge and perpendicularly intersects the axis of rotation, and wherein 5°

≦

90°

−

{tilde over (β

)}{tilde over (β

2)}≦

90°

.

15. The turbomachine as defined in claim 14, wherein the obtuse angle {tilde over (β

)}{tilde over (β

1)};

=β

1+90° and

the acute angle {tilde over (β

)}{tilde over (β

2)};

=90°

−

β

2 satisfy the following relation;

{tilde over (β

)}{tilde over (β

1)}<

180°

−

{tilde over (β

)}{tilde over (2)}.

16. The turbomachine as defined in claim 13, wherein the blade surface of the rotor blades are substantially parallel to the axis of rotation.

17. The turbomachine as defined in claim 13, wherein the distance r2 of the first blade edge of each rotor blade, which faces the guide blade ducts, from the axis of rotation and the distance r₁ of the second blade edge of each rotor blade, which faces away from the guide blade ducts, from the axis of rotation satisfy the following relation:

70%<

r₁/r₂<

80%.

18. The turbomachine as defined in claim 13, wherein the number Z of rotor blades of the rotor satisfies the following relation:

Z≈

C·

r₁/r₂, wherein the distance r₂ of the first blade edge of each rotor blade, which faces the guide blade ducts, from the axis of rotation and the distance r₁ of the second blade edge of each rotor blade, the second blade edge facing away from the guide blade ducts, from the axis of rotation, wherein C is a constant and 70≦

C≦

90.

19. The turbomachine as defined in claim 13, wherein the distance r2 of the first blade edge of each rotor blade, the first blade edge facing the guide blade ducts, from the axis of rotation and the height of the first blade edge of each rotor blade, the height being parallel to the axis of rotation, satisfy the following relation:

12%≦

h_E/r₂≦

28%.

20. The turbomachine as defined in claim 1, wherein the rotor has a rotor blade support to support the rotor blades and a rotationally symmetrical guide contour, against which working medium can flow and which deflects a flow path for the working medium between the rotor blade ducts and a diffuser space.

21. The turbomachine as defined in claim 20, wherein the guide contour extends into the diffuser space.

22. The turbomachine as defined in claim 20, wherein the rotor blades and the rotor blade support are coupled, fixed releasably, or integrally formed from a solid material by one or more of turning, erosion, milling or electrolytic machining of the solid material.

23. The turbomachine as defined in claim 1, wherein the guide blade ducts in the housing are formed spiral guide blades, which are mounted on an annular guide blade support, covered by a cover and have a convex blade surface facing away from the axis of rotation.

24. The turbomachine as defined in claim 23, wherein the guide blade support and the guide blades are coupled or manufactured from a one-piece flanged socket by one or more of erosion, milling or electrolytic machining.

25. The turbomachine as defined in claim 23, wherein the guide blades have blade surfaces that are parallel to the axis of rotation.

26. The turbomachine as defined in claim 25, wherein the distance between two adjacent guide blades increases in a direction of flow of the working medium toward the rotor blade ducts.

27. The turbomachine as defined in claim 26, wherein the height of the guide blades decreases with increasing distance from the axis of rotation.

28. The turbomachine as defined in claim 23, wherein the guide blade support and the cover define a compensating space, which is open toward the housing duct, opens into the guide blade ducts and has a cross section that tapers in a direction toward the axis of rotation.

29. The turbomachine as defined in claim 1, wherein the turbomachine is used as a turbine in an Organic Rankine Cycle process or as a compressor for compressing gaseous medium.

30. A turbomachine, comprising:

a rotor rotatable about an axis of rotation and having rotor blade ducts;

a housing having housing ducts to allow the inflow or outflow of working medium; and

guide blade ducts fixed in the housing, wherein the rotor blade ducts are in fluid communication with the housing ducts via the guide blade ducts.

31. The turbomachine as defined in claim 30, wherein the guide blade ducts in the housing are formed by spiral guide blades, which are mounted on an annular guide blade support, covered by a cover and have a convex blade surface facing away from the axis of rotation.