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The invention relates to a lead-in structure for coupling of a turbo generator in a circulating process of a circulating medium. The turbo generator includes a turbine and a generator as well as possibly also a feed pump enclosed in a common casing structure. The casing structure also includes at le

The invention relates to a lead-in structure for coupling of a turbo generator in a circulating process of a circulating medium. The turbo generator includes a turbine and a generator as well as possibly also a feed pump enclosed in a common casing structure. The casing structure also includes at least a first duct for hot, steam-like circulating medium entering the turbine, a second duct for circulating medium exiting the turbine, and a third duct for cooled liquid circulating medium, which, for example, enters the feed pump. The third duct includes an annular channel that is placed, preferably concentrically, around the second duct, which includes an annular channel. The first duct includes an annular channel that is placed, preferably concentrically, between the second duct and the annular channel of the third duct. The fixing flange applying the lead-in structure may include a closing valve that is controlled with a pressurized medium and that is arranged to keep the tubular channel of the second duct normally open and to keep it closed for releasing the casing element, wherein the closing valve is placed inside the tubular channel.

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1. A lead-in structure for coupling a turbo generator to a circulation process of a circulating medium, the turbo generator comprising a turbine and a generator enclosed in a common casing structure, and wherein casing structure comprises at least a first duct for hot, steam-like circulating medium

1. A lead-in structure for coupling a turbo generator to a circulation process of a circulating medium, the turbo generator comprising a turbine and a generator enclosed in a common casing structure, and wherein casing structure comprises at least a first duct for hot, steam-like circulating medium entering the turbine, a second duct for circulating medium exiting the turbine, and a third duct for cooled liquid circulating medium, wherein the third duct comprises an annular channel, through which circulating medium is led to and, which is placed around the second duct, and wherein the first duct comprises an annular channel, through which circulating medium is led into the turbine for the supply and which is placed between the second duct and the annular channel of the third duct.2. The lead-in structure according to claim 1, wherein the casing structure comprises a casing element and a fixing flange to be fixed thereto, which is arranged to close the casing element hermetically and to fix the turbo generator in its position, wherein the casing element and the fixing flange comprise sealing surfaces placed against each other, wherein one or several annular channels consist of an annular groove made in one sealing surface, closed by another sealing surface, or of annular grooves made in both sealing surfaces which are placed against each other to form a uniform annular channel.3. The lead-in structure according to claim 2, wherein the annular channel of the first duct is placed in the fixing flange and at a distance from the sealing surface, to which the circulating medium is arranged to be led via drillings from the annular channel.4. The lead-in structure according to claim 2, wherein the sealing surface is provided with a first sealing between the second duct and the first duct, a second sealing between the first duct and the third duct, and a third sealing around the third duct.5. The lead-in structure according to claim 2, wherein the circulating medium is arranged to be fed into the annular channel of the third duct via a first drilling extending through the fixing flange and off from the annular channel via a second opening extending through the casing element, wherein said openings are further placed at a distance from each other.6. The lead-in structure according to claim 2, wherein the second duct comprises a tubular channel, and that the fixing flange comprises a closing valve which can be controlled by pressurized medium and which is arranged to keep the tubular channel of the second duct normally open and to keep it closed for releasing of the casing element, wherein the closing valve is placed inside the tubular channel.7. The lead-in structure according to claim 2, wherein the fixing flange comprises a tubular part in which the second duct is placed, and a collar part placed around the end of the tubular part, in which at least the first duct and at least the third duct are placed.8. The lead-in structure according to claim 6, wherein the closing valve comprises a guide disc which can be moved back and forth and which is arranged, in its first position, to close the tubular channel in a sealed manner and, in its second position, to guide, by its shape, the circulating medium into the tubular channel, and a cylinder structure which is controlled by a pressurized medium and which is arranged to move the guide plate fixed thereto.9. The lead-in structure according to claim 2, wherein the second duct comprises a tubular channel, and that the annular channels are placed on one or several parallel planes which are substantially perpendicular to the axial tubular channel of the second duct.10. The lead-in structure according to claim 1, wherein the second duct comprises a tubular channel, and that the annular channels are placed on one or several parallel planes which are substantially perpendicular to the axial tubular channel of the second duct.11. The lead-in structure according to claim 1, wherein the circulating medium is arranged to be fed into the annular channel of the third duct via a first drilling extending through the fixing flange and off from the annular channel via a second opening extending through the casing element, wherein said openings are further placed at a distance from each other.12. The lead-in structure according to claim 1, wherein the second duct comprises a tubular channel, and that the fixing flange comprises a closing valve which can be controlled by pressurized medium and which is arranged to keep the tubular channel of the second duct normally open and to keep it closed for releasing of the casing element, wherein the closing valve is placed inside the tubular channel.13. The lead-in structure according to claim 12, wherein the closing valve comprises a guide disc which can be moved back and forth and which is arranged, in its first position, to close the tubular channel in a sealed manner and, in its second position, to guide, by its shape, the circulating medium into the tubular channel, and a cylinder structure which is controlled by a pressurized medium and which is arranged to move the guide plate fixed thereto.14. The lead-in structure according to claim 13, wherein the closing valve is supported to the tubular channel by one or more guide blades, wherein the pressurized medium is led to the closing valve via a drilling made in one or more of the guide blades.15. The lead-in structure according to claim 13, wherein the closing valve is arranged to close and remain closed when moved by the force effect of the pressure of the circulating medium used as a pressurized medium, and is arranged to open and remain open when moved by the force effect of a spring means.16. The lead-in structure according to claim 15, wherein the closing valve is supported to the tubular channel by one or more guide blades, wherein the pressurized medium is led to the closing valve via a drilling made in one or more of the guide blades.17. The lead-in structure according to claim 12, wherein the closing valve is supported to the tubular channel by one or more guide blades, wherein the pressurized medium is led to the closing valve via a drilling made in one or more of the guide blades.18. The lead-in structure according to claim 1, wherein the fixing flange comprises a tubular part in which the second duct is placed, and a collar part placed around the end of the tubular part, in which at least the first duct and at least the third duct are placed.19. A fixing flange for coupling a turbo generator in a detachable manner to the circulating process of a circulating medium, for maintenance, wherein the fixing flange comprises at least a first duct for hot, steam-like circulating medium entering the turbine, at least a second duct for circulating medium exiting the turbine, and at least a third duct for cooled liquid circulating medium, wherein the third duct comprises an annular channel, through which circulating medium is led to and which is placed around the second duct, and wherein the first duct comprises an annular channel, through which circulating medium is led to the turbine for supply, and which is placed between the second duct and the annular channel of the third duct.20. The fixing flange according to claim 19, wherein the second duct comprises a tubular channel, and that the fixing flange comprises a closing valve which can be controlled by a pressurized medium and which is arranged to keep the tubular channel of the second duct normally open and to keep it closed for releasing of the turbo generator, wherein the closing valve is placed inside the tubular channel.21. The fixing flange according to claim 19, wherein the fixing flange comprises a sealing surface which is placed towards the turbo generator, wherein the sealing surface is provided with an annular open groove which, closed by the turbo generator, forms the annular channel of the third duct, and that the fixing flange comprises a circumferential set of drillings which extend to the sealing surface from the annular channel of the first duct, whose diameter is smaller than the diameter of the annular channel of the third duct.22. The fixing flange according to claim 20, wherein the fixing flange comprises a sealing surface which is placed towards the turbo generator, wherein the sealing surface is provided with an annular open groove which, closed by the turbo generator, forms the annular channel of the third duct, and that the fixing flange comprises a circumferential set of drillings which extend to the sealing surface from the annular channel of the first duct, whose diameter is smaller than the diameter of the annular channel of the third duct.23. The lead-in structure according to claim 1, wherein the annular channel of the third duct is placed concentrically around the second duct.24. The lead-in structure according to claim 1, wherein the annular channel of the first duct is placed concentrically between the second duct and the annular channel of the third duct.25. The lead-in structure according to claim 1, wherein the turbo generator comprises a feed pump enclosed in the common casino structure.26. The lead-in structure according to claim 25, wherein the circulating medium is led to the feed pump for the supply through the annular channel of the third duct.27. The lead-in structure according to claim 25, wherein the cooled liquid circulating medium is led to the feed pump through the third duct.28. The lead-in structure according to claim 9, wherein the axial tubular channel of the second duct is placed on the common rotating axis of the turbo generator.29. The lead-in structure according to claim 10, wherein the axial tubular channel of the second duct is placed on the common rotating axis of the turbo generator.30. The fixing flange according to claim 19, wherein the annular channel of the third duct is placed concentrically around the second duct.31. The fixing flange according to claim 19, wherein the annular channel of the first duct is placed concentrically between the second duct and the annular channel of the third duct.32. The fixing flange according to claim 19, wherein the cooled liquid circulating medium is led to a feed pump through the third duct.33. The fixing flange according to claim 32, wherein the circulating medium is led to the feed pump for supply through the annular channel of the third duct.