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3 EP 2 578 800 A1 4 problem that the amount of the supplied steam is limited by the small size holes, so the amount of the supplied steam is not enough for the steam passage to be reach to the radial outflow via the small holes on the limited diameter and the limited surface of the rotation shaft. As a result, a sufficient amount of output cannot be obtained. In addition, it is difficult to manufacture such a turbine, and the manufacturing cost will be high, so it has not become popular in the actual industrial use. [0008] Moreover, the amount of the surface area for steam flow through the gap between the rotor disk and stator disk is almost the same even if the amount of the surface area of the rotor blades is increased or de- creased. Regarding the ratio of the amount of the surface area of the rotor blades and the amount of the surface area of the gap for the steam to be flowed, the amount of the surface area of the rotor blades should be relatively large enough. In the prior art 3, the small rotor blades are employed, so the steam leakage loss will be large. As a result, it is not suitable for the actual use even if the number of the rotor disks is increased. [0009] Therefore, in order to increase the output of the radial flow steam turbine, the rotor blades and the stator blades are arrayed in multistage manner. The steam to have been decompressed and to have expanded in the steam passage to the radial outflow becomes faster and gives the rotating motion energy to the rotor blades. How- ever, the rapid expansion of the steam occurrs, the vol- ume of the operating steam is expanded rapidly, it is dif- ficult for steam to run through the gap between the rotor blades and the stator blades. As a result, the steam flow may be blocked and stuffed, so the speed of the steam flow may be decreased. [0010] It is an object of the present invention to provide a high efficiency radial flow steam turbine by simplifying the steam supply method and supplying a sufficient amount of steam in the multiplied turbine unit installed on the rotation shaft. Means for solving the problems [0011] In order to achieve the above-mentioned object, the present invention of a radial flow steam turbine com- prises; a rotation shaft; a rotor disk connected to the ro- tation shaft; rotor blades mounted on the rotor disk; a stator disk facing to the rotor disk fixed and supported by a casing; stator blades mounted on the stator disk; where- in the rotor blades mounted on the rotor disk and the stator blades mounted on the stator disk are arrayed al- ternately in the radial direction; an operating steam flow passage in which the operating steam flows from in the vicinity of the rotation shaft to the outflow radial direction, wherein a steam supplied from the steam supply source flows to the steam flow passage as an operating steam for rotating the rotor disk and the rotation shaft; and a steam supply route along to the axial direction is formed and secured by forming a through opening on the rotor disk in the vicinity of the rotation shaft. [0012] According to the above-mentioned configura- tion, the radial flow steam turbine can improve the steam supply that was difficult in the prior art, and sufficient amount of the steam can be supplied to every turbine unit arrayed in the axial direction. [0013] It is preferable that the set of the rotor disk and the stator disk is provided for at least one unit. Therefore, the number of the rotor disk is at least one, the rotor blades are mounted on the both sides of each rotor disk respectively, and the stator disks face to both sides of each rotor disk respectively. The operating steam flow passages are formed to be at least two, and the steam is led from the steam supply source to each operating steam flow passage via the steam supply route. [0014] The combination of the shape of the rotor disk and the shape of the through opening in the vicinity of the rotation shaft of the rotor disk are as follows. [0015] The first combination is that the rotor disk is in- stalled on the rotation shaft directly, and the through opening of the rotor disk is through hole in the vicinity of the rotation shaft of the rotor disk. [0016] The second combination is that the rotor disk is a doughnut-shape hollow circular disk having a center hole larger than the diameter of the rotation shaft, wherein the rotor disk is supported by the plural rotor disk sup- porters fixed to the rotation shaft, and the through open- ing of the rotor disk in the vicinity of the rotation shaft of the rotor disk is the inter-gap between the rotor disk sup- porters. [0017] In those combinations, if the stator disk is fixed to the casing by securing the gap between stator disk edge and the rotation shaft, the gap between the stator disk edge and the rotation shaft forms a part of the steam supply route. [0018] It is preferable that the rotor blades mounted on the rotor disk and the stator blades mounted on the stator disk are formed outside of the steam supply route. Be- cause as a part of the steam supply route, the through opening is formed in the vicinity of the rotation shaft in the rotor disk, and the gap between the stator disk edge and the rotation shaft is formed in the vicinity of the ro- tation shaft. Therefore the rotor blades and the stator blades do not cover this area and secure the through opening. [0019] It is preferable that the steam supply directions from the steam supply source to the operating steam flow passage via the steam supply route are two directions, the one is the direction from the one terminal of the ro- tation shaft, and the other is the direction from the other terminal of the rotation shaft. [0020] Next, if there are plural sets of the rotor disk and stator disk along the axial direction, it is preferable that the operating steam pressure adjusting through holes for adjusting the air pressure gap among the steam flow pas- sages by connecting through the operating steam flow passages are formed appropriately on the rotor disk and the stator disk besides the steam supply route. [0021] According to the above-mentioned configura- 5 10 15 20 25 30 35 40 45 50 55 3PDF Image | EP 2 578 800 A1 EUROPEAN PATENT
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