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9 EP 2 578 800 A1 10 [0041] The stator blades 31 can be mounted on either a single surface or both surfaces of the stator disk 30. In the configuration shown in Fig.1, regarding the stator disk 30 fixed on the right end and the left end, the stator blades 31 are mounted on only the inside surface, and regarding 5 the stator disk 30 in the middle, the stator blades 31 are mounted on both sides. The installation position of the stator blades 31 on the stator disk 30 is on the outer part of the steam passage portion 32 because the steam pas- sage portion 32 exists in the vicinity of the rotation shaft. 10 [0042] The number of the stator blade 31 is not limited, in this configuration, one stage of the stator blades com- prises the plural stator blades arrayed in annularly on the stator disk 30, and the multi-stage stator blades comprise plural stages mounted on the stator disk 30 arrayed an- 15 nularly on concentric paths. The configuration shown in Fig.1 is the multi-stage stator blades comprising four stages corresponding to the four multi-stage rotor blades. The example configuration using the single stage stator blades 31 is described in Embodiment 2 later on. 20 [0043] The steam passage portion 32 is a through opening existing in the vicinity of the rotation shaft on the stator disk 30, and it works as a part of the steam supply route passing the steam flow in the axial direction. In this configuration, the stator disk 30 is fixed to the casing by 25 securing the gap between stator disk edge and the rota- tion shaft, the gap between the edge of the stator disk 30 and the rotation shaft 10 forms the steam passage portion 32. The steam passage portion 32 works as a part of the steam supply route. 30 [0044] Next, the casing 40 is described. The casing 40 is not limited especially. It is supplied as the housing for the rotation shaft 10, the bearing (not shown in figures), the rotor disk 20, and the stator disk 30. The casing 40 is supported by a stand (not shown in figures). As inner 35 casing and an outer casing may be included in the casing 40. [0045] It is preferable that the casing 40 is sealed ap- propriately for blocking the steam leakage. The steam leakage countermeasures is important, so the steam 40 leakage mitigation system such as fins, shrouds or lab- yrinths 42 is appropriately installed to the portions such as the gap between the rotor disk 20 and the stator blades 31, the gap between the stator disk 30 and the rotor blades 21, the gap between the rotation shaft 10 and the 45 casing 40, and the surrounding area of the steam input opening 41. [0046] There are the steam input openings 41 in the casing 40. The steam is supplied from the steam supply source (it is not shown in figures) to the inside of the 50 casing 40 via the steam input openings 41. The steam input openings 41 may be formed on one side of the casing 40 and the steam supplied from the one side only, and the steam input openings 41 may be formed on both sides of the casing 40 and the steam supplied from both 55 sides. [0047] Next, the operating steam flow passage portion 50 is described. [0048] The operating steam flow passage portion 50 is an operating steam passage formed between facing the rotor disk 20 and the stator disk 30. The flow direction of the operating steam flow is the radial direction from the center portion to the outer portion. The operating steam flow passage portion 50 passes the supplied steam from the steam supply source (it is not shown in figures) and makes the rotor disk 20 and the rotation shaft rotate. [0049] In the configuration shown in Fig.1, both the ro- tor disk 20 and the stator disk 30 are installed to the ro- tation shaft 10 perpendicularly, so these are facing each other in parallel, and the width of the operating steam flow passage portion 50 is constant in the radial direction. Other configurations are possible. Either the rotor disk 20 or the stator disk 30, or both of them can have a skew against the rotation shaft in order to modify the operating steam flow passage portion 50 as follows; the more the steam flows to the outer side, the larger the width of the operating steam flow passage portion 50 becomes. As described later, the operating steam flowing in the radial direction from center portion outward through the oper- ating steam flow passage portion 50 becomes high speed by expansion and running through the stator blades 31 and the rotor blades 21, so the larger the width of the operating steam flow passage portion 50 becomes, the more the operating steam flows to the outer side in the radial direction. [0050] The radial flow steam turbine 100 of the present invention may employ plural steam flow passages 50. The radial flow steam turbine 100 of the present invention includes at least one rotor disk, rotor blades mounted on both side surfaces of the rotor disk respectively, the stator disks installed corresponding to both sides of each rotor disk respectively, so that at least two operating steam flow passage portions are formed. In the configuration shown in Fig.1, there are four rotor disks 20, five stator disks 30, and eight operating steam flow passage por- tions 50. [0051] Next, the operating steam pressure adjusting holes 51 is described. [0052] In the configuration shown in Fig.1, there are four rotor disks 20, five stator disks 30, and eight oper- ating steam flow passage portions 50. In this configura- tion, there is no air pressure difference among the steam flow passages 50 because there are steam supply routes in the vicinity of the rotation shaft on each rotor disks 20 respectively through the axis direction. However, when the number of the stages of the operating steam flow passage portions 50 become larges, uneven steam ex- pansion may occur in the stages according to the condi- tion such as the amount of the steam volume supplied from the steam supply source being unstable. If the op- erating steam volume becomes large quickly by the rapid expansion of the supplied steam, not all the supplied steam passes through the gap between the rotor blades 21 and the stator blades 31 smoothly. In this case, the steam flow to the outflow direction is blocked and the 6PDF Image | EP 2 578 800 A1 EUROPEAN PATENT
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