公开(公告)号：US12188477B2

公开(公告)日：2025-01-07

申请号：US18044815

申请日：2021-10-01

Applicant: Edwards Japan Limited

Inventor： Tooru Miwata ,  Yoshiyuki Sakaguchi ,  Yoshiyuki Takai ,  Yasuhiro Shibata

IPC: F04D19/04 ,  F04D29/32

Abstract: A lower portion of a cylindrical portion provided in a vacuum pump on the outlet port side has an extension portion extending to a further downstream side than a stationary part of a thread groove exhaust element. In the extension portion, the smaller the outer diameter, the smaller the stress applied to the inner diameter side during rotation. As such, the configuration including a reduced diameter portion reduces the stress applied to the inner diameter side of the cylindrical portion without lowering the rotation speed of the rotating body. Additionally, providing a gradually decreasing diameter structure in the extension portion reduces stress concentration at the reduced diameter portion.

公开(公告)号：US20240026888A1

公开(公告)日：2024-01-25

申请号：US18044815

申请日：2021-10-01

Applicant: Edwards Japan Limited

Inventor： Tooru Miwata ,  Yoshiyuki Sakaguchi ,  Yoshiyuki Takai ,  Yasuhiro Shibata

IPC: F04D19/04 ,  F04D29/32

CPC classification number: F04D19/042 ,  F04D29/321 ,  F05D2250/292

Abstract: A lower portion of a cylindrical portion provided in a vacuum pump on the outlet port side has an extension portion extending to a further downstream side than a stationary part of a thread groove exhaust element. In the extension portion, the smaller the outer diameter, the smaller the stress applied to the inner diameter side during rotation. As such, the configuration including a reduced diameter portion reduces the stress applied to the inner diameter side of the cylindrical portion without lowering the rotation speed of the rotating body. Additionally, providing a gradually decreasing diameter structure in the extension portion reduces stress concentration at the reduced diameter portion.