ROTARY MACHINE

• Main Authors: TOKUYAMA SHINICHIRO, NAGAI NAOYUKI, SABURI SEIJI
• Format: Patent
• Language: English; Japanese
• Published: 18.12.2014
• Subjects: BLASTING; CYLINDERS; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; PISTONS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; SEALINGS; THERMAL INSULATION IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To effectively decrease a rotational-direction speed of a swirl flow flowing into a seal part.SOLUTION: A rotary machine comprises: rotary body 12 rotating axially; a stationary body 6 arranged to face the rotary body 12 in a radial direction of the rotary body; a seal part 4 sealing a gap between the rotary body 12 and the stationary body 6; and a swirl flow suppression unit 25 including a plurality of concave portions 25 formed circumferentially recessed from the stationary body 6 on a high pressure side of the seal part 4 in the gap and reducing a swirl flow S flowing in a rotational direction R of the rotary body 12. Each concave portion 25 includes: a guide surface 26 connected to a forward edge 25a of the concave portion 25 in the rotational direction R in a cross-sectional view crossing an axial line and continuously extending so as to guide a branch flow S2 from the swirl flow S backward in the rotational direction R; and an introduction surface 27 connected to the guide surface 26 and introducing the branch flow S2 into the gap in the radial direction. 【課題】シール部に流入する旋回流の回転方向速度を効果的に低減させる。【解決手段】軸線回りに回転する回転体１２と、回転体１２の径方向に対向して配置される静止体６と、回転体１２と静止体６との間隙をシールするシール部４と、間隙におけるシール部４の高圧側において静止体６から窪むように周方向に複数が形成された凹部２５を有し、回転体１２の回転方向Ｒに流れる旋回流Ｓを減少させる旋回流抑制部２５と、を備え、凹部２５は、軸線に直交する断面視にて、凹部２５の回転方向前方側の縁部２５ａに接続されて、旋回流Ｓからの分流Ｓ２を回転方向後方側に向かって案内するように連続して延びる案内面２６と、案内面２６に接続されて分流Ｓ２を径方向に向かって間隙に導入する導入面２７と、を有する回転機械を提供する。【選択図】図５