公开(公告)号：US11814984B2

公开(公告)日：2023-11-14

申请号：US17615362

申请日：2020-05-27

Applicant: Mitsubishi Power, Ltd.

Inventor： Hidetaka Okui ,  Kondo Takahiro

IPC: F01D5/30 ,  F04D17/10 ,  F04D29/34 ,  F04D29/32

CPC classification number: F01D5/3007 ,  F04D17/10 ,  F04D29/34 ,  F01D5/3015 ,  F04D29/322 ,  F05D2220/32 ,  F05D2240/24

Abstract: A rotor has formed therein a groove with which a moving blade including a dovetail portion and a platform portion connecting the dovetail portion and a blade portion engages. The groove opens in a surface intersecting the axis of rotation of the rotor, and includes a contacting portion extending obliquely with respect to the axis of rotation and coming into contact with the dovetail portion, a bottom portion of an end portion on the radially inner side of the rotor, a joining portion between the contacting portion and the bottom portion, a platform facing portion facing the platform portion, and a chamfered portion formed on an end surface in the groove-extending direction. The chamfered dimension of the joining portion is greater on the side with an acute angle between the groove and the end surface than on the side with an obtuse angle between the groove and the end surface.