REGULATING VALVE AND TURBINE

Abstract

A control valve for controlling a gaseous volumetric flow rate, in particular a steam volumetric flow rate, having a valve housing, a valve seat, and a valve throttle element which can be moved relative to the valve seat along a movement axis. The valve housing shapes the valve seat, and the movable valve throttle element has a throttle edge region which interacts with the valve seat. The control valve has multiple volumetric flow rate swirl elements which interact with the throttle edge region and which prevent or at least reduce shear layer instabilities in a shear layer between a wall jet region of the gaseous volumetric flow rate and a core flow region of the gaseous volumetric flow rate.

Claims

1. A regulating valve for regulating a gaseous volume flow, comprising: a valve housing, having a valve seat and having a valve throttle element which is displaceable along a displacement axis relative to the valve seat, in which valve the valve housing forms the valve seat and in which valve the displaceable valve throttle element has a throttle edge region which interacts with the valve seat, wherein the regulating valve has a plurality of volume-flow swirl elements which interact with the throttle edge region and which prevent or at least reduce shear-layer instabilities in a shear layer between a wall-jet region of the gaseous volume flow and a core-flow region of the gaseous volume flow, characterized in that the throttle edge region of the displaceable valve throttle element has material recesses and/or material webs, wherein the material recesses and/or the material webs are at least in part of different length in the circumferential direction.

2. The regulating valve as claimed in claim 1, wherein the volume-flow swirl elements are arranged on the valve housing concentrically around the displacement axis and opposite the throttle edge region.

3. The regulating valve as claimed in claim 1, wherein the volume-flow swirl elements are arranged on the throttle edge region of the displaceable valve throttle element concentrically around the displacement axis.

4. The regulating valve as claimed in claim 1, wherein the throttle edge region of the displaceable valve throttle element is formed asymmetrically on a side facing the valve seat.

5. The regulating valve as claimed in claim 1, wherein the throttle edge region of the displaceable valve throttle element is formed asymmetrically in the circumferential direction of said region.

6. The regulating valve as claimed in claim 1, wherein the material recesses and/or the material webs face the valve seat.

7. The regulating valve as claimed in claim 1, wherein the material recesses and/or the material webs are arranged on the valve throttle element in an unevenly distributed manner in the circumferential direction of the throttle edge region.

8. The regulating valve as claimed in claim 1, wherein the throttle edge region of the displaceable valve throttle element has a serrated crown shape on a side facing the valve seat.

9. The regulating valve as claimed in claim 1, wherein the gaseous volume flow is a steam volume flow.

10. A turbine having a multiplicity of valve devices, wherein at least one of the valve devices comprises a regulating valve as claimed in claim 1.

11. The turbine as claimed in claim 10, wherein the turbine is a steam turbine.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In the drawings:

[0040] FIG. 1 diagrammatically shows a model view of a regulating valve for regulating a steam volume flow, having a multiplicity of volume-flow swirl elements which interact with the throttle edge region and which prevent shear-layer instabilities in a shear layer between a wall-jet region of the gaseous volume flow and a core-flow region of the gaseous volume flow;

[0041] FIG. 2 diagrammatically shows a perspective view of another valve throttle element, having a plurality of volume-flow swirl elements which are arranged symmetrically in the circumferential direction on a throttle edge region; and

[0042] FIG. 3 diagrammatically shows a perspective view of a further valve throttle element, having a plurality of volume-flow swirl elements which are arranged asymmetrically in the circumferential direction on a throttle edge region.

DETAILED DESCRIPTION OF INVENTION

[0043] The regulating valve 1 shown in FIG. 1 for regulating or at least for throttling especially a steam volume flow 2 has a valve housing 3 which has a flow interior space 4, on the inner side (not separately numbered) of which housing a conical valve seat 5 is configured.

[0044] In the valve housing 3, there is arranged a valve throttle element 6 which is displaceable relative to the valve seat 5, wherein said valve throttle element 6 is displaceable along a displacement axis 7.

[0045] Here, the steam volume flow 2 flows through the regulating valve 1 in the through-flow direction 8.

[0046] The valve throttle element 6 has a throttle edge region 10 which is able to interact more strongly with the valve seat 5 introduced in the valve housing 3 the closer to the valve seat 5 the valve throttle element 6 is moved. This applies in particular if the regulating valve 1 is run in a throttled operating state in which the valve throttle element 6 is arranged spaced apart from the valve seat 5 with only a relatively small gap in comparison with an open operating state of the regulating valve 1.

[0047] The throttle edge region 10 is at least in part formed in a conical or toroidal manner, such that it is compatible with the conical valve seat 5.

[0048] Here, the throttle edge region 10 extends around the displacement axis 7 in an annular manner.

[0049] Furthermore, the throttle edge region 10 is distinctly formed on one end 11, facing the valve seat 5, of the throttle valve element 6.

[0050] In order to prevent or at least to reduce shear-layer instabilities, the regulating valve 1 has a multiplicity of volume-flow swirl elements 15 (numbered merely by way of example) which interact with the throttle edge region 10 and by means of which significantly improved mixing of the shear layer (not shown) is realized, such that speed gradients between a wall-jet region (not shown) of the steam volume flow 2 and a core-flow region (not shown) of the steam volume flow 2 can be avoided or at least reduced.

[0051] In the exemplary embodiment shown in FIG. 1, the volume-flow swirl elements 15 are arranged on the valve housing 3 concentrically around the displacement axis 7 and opposite the throttle edge region 10.

[0052] Here, the volume-flow swirl elements 15 are formed on the valve housing 3 as material accumulations 16 which are distinctly formed on the valve seat 5.

[0053] The regulating valve 1 shown in FIG. 1 is used as a throttle valve in a valve device of a steam turbine 17 (not further shown here).

[0054] In the case of the other valve throttle element 106 shown in FIG. 2, which may be a component of a similar regulating valve 1 as shown in FIG. 1, wherein the regulating valve associated with the other valve throttle element 106 is not shown.

[0055] The valve throttle element 106 has an at least in part conically configured throttle edge region 110 which is formed symmetrically on a side 120 facing the valve seat 5 (see FIG. 1 by way of example).

[0056] On the throttle edge region 110 of the valve throttle element 106 there is arranged a multiplicity of volume-flow swirl elements 115 which, in said exemplary embodiment, are distinctly formed as material recesses 121 on the throttle edge region 110.

[0057] The material recesses 121 also lead to material webs 122 on the throttle edge region 110, wherein in each case two material webs 122 laterally delimit a material recess 121 in the circumferential direction 123 of the throttle edge region 110, and vice versa.

[0058] Said material recesses 121 are introduced as pocket regions into the throttle edge region 110 and they prevent shear-layer instabilities in a shear layer between a wall-jet region of the steam volume flow and a core-flow region of the steam volume flow.

[0059] The material recesses 121 or the material webs 122 are arranged on the valve throttle element 106 in an evenly distributed manner in the circumferential direction 123 of the throttle edge region 110.

[0060] In any case, the throttle edge region 110 of the displaceable valve throttle element 106 is realized in the form of a serrated crown shape 125 on the side 124 of said region facing the valve seat 5, wherein the teeth are formed by the material webs 122.

[0061] By means of the valve throttle element 106 formed in said manner, shear-layer instabilities in a shear layer between a wall-jet region of the steam volume flow 2 (see FIG. 1 by way of example) and a core-flow region of the steam volume flow 2 can be prevented cumulatively or alternatively.

[0062] In the further valve throttle element 206 shown in FIG. 3, which is approximately structurally identical to the other valve throttle element 106 shown in FIG. 2, the material recesses 221 or material webs 222 provided on the throttle edge region 210 are arranged on the valve throttle element 206 in an unevenly distributed manner in the circumferential direction 223 of the throttle edge region 210, whereby the effects with regard to the prevention of shear-layer instabilities in a shear layer between a wall-jet region of the steam volume flow 2 (see FIG. 1 by way of example) and a core-flow region of the steam volume flow 2 can be further intensified.

[0063] The formed-in material recesses 221 on the throttle edge region 210 and, in this respect, also the material webs 222 corresponding to said recesses are of different length in the circumferential direction 223 of the throttle edge region 210.

[0064] Said further valve throttle element 206 can also be a component of a similar regulating valve 1 as shown in FIG. 1, wherein the regulating valve associated with the other valve throttle element 206 is also not shown.

[0065] The valve throttle element 206 thus has an at least in part conically configured throttle edge region 210 which is, however, formed asymmetrically on a side 224 facing the valve seat 5 (see FIG. 1 by way of example).

[0066] In this respect, on the throttle edge region 210 of the valve throttle element 206 there is likewise provided a multiplicity of volume-flow swirl elements 215 which, in the exemplary embodiment shown in FIG. 3, are distinctly formed as material recesses 221 in the shape of pocket regions on the throttle edge region 210.

[0067] The material recesses 221 or the material webs 222 are arranged on the valve throttle element 206 in an unevenly distributed manner in the circumferential direction 223 of the throttle edge region 210.

[0068] Also, the throttle edge region 210 of the displaceable valve throttle element 206 is realized in the form of a serrated crown shape 225 on the side 224 of said region facing the valve seat 5.

[0069] Although the invention has been more specifically illustrated and described in detail by the preferred exemplary embodiment, the invention is not limited by the exemplary embodiment disclosed and other variations can be derived herefrom by a person skilled in the art, without departing from the protective scope of the invention.