Sealing device

Patent metadata

Field	Value
Publication number	US-10822984-B2
Application number	US-201616062941-A
Country	US
Kind code	B2
Filing date	Oct 20, 2016
Priority date	Dec 24, 2015
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A sealing device includes a fin, a through hole, and a high pressure fluid supplying unit. The fin extends from a stationary body toward a rotating body in a gap between the stationary and rotating bodies. The fin is not in contact with the rotating body. The through hole is formed to be opened in at least one of the stationary body and the rotating body on an upstream side of the fin in a flow direction of a fluid to flow into the gap between the stationary body and the rotating body. The through hole is opened toward an upstream side of the fluid to flow in the gap between the stationary body and the rotating body. The high pressure fluid supplying unit is configured to supply a high pressure fluid to the gap from the through hole. The high pressure fluid has a higher pressure than the fluid.

First claim

The invention claimed is:

1. A sealing device applied to a rotary machine, comprising:
a fin extending from a stationary body toward a rotating body in a first gap between the stationary body and the rotating body, the fin being not in contact with the rotating body;
a through hole opened in at least one of the stationary body and the rotating body on an upstream side of the fin in a flow direction of a fluid to flow into the first gap between the stationary body and the rotating body, the through hole being opened toward an upstream side of the fluid to flow in the first gap between the stationary body and the rotating body; and
a high pressure fluid supplying unit configured to supply a high pressure fluid to the first gap between the stationary body and the rotating body from the through hole, the high pressure fluid having a higher pressure than the fluid to flow into the first gap between the stationary body and the rotating body,
wherein the high pressure fluid supplied from the through hole to the first gap between the stationary body and the rotating body boosts a vortex to be stronger, the vortex being generated when the fluid collides with the fin on the upstream side of the flow direction of the fluid at the fin,
wherein the rotary machine includes:
a rotor extending along a rotational axis of the rotor in the rotating body,
a casing for storing the rotor,
a fluid passage provided between the rotor and the casing along an extending direction of the rotor, and
a fluid nozzle unit having an annular shape that surrounds an outer peripheral surface of the rotor, the fluid nozzle unit being attached to the casing with a second gap communicating with the fluid passage between an outer face of the fluid nozzle unit and an outer peripheral surface of the rotor, the fluid nozzle unit including a fluid nozzle chamber to which a superheated fluid being supplied and which is formed inside the fluid nozzle unit in an annular shape and an opening communicating with the fluid passage from the fluid nozzle chamber toward the extending direction of the rotor, the fluid nozzle unit being in the stationary body,

wherein the fin is arranged in the second gap between the outer face of the fluid nozzle unit and the outer peripheral surface of the rotor and extending from the fluid nozzle unit toward the rotor,
wherein the through hole is arranged to be opened toward the fluid nozzle unit in the rotor, and
wherein the high pressure fluid supplying unit supplies, to the rotary machine, a high pressure fluid having a higher pressure and a lower temperature than the fluid supplied to the rotary machine to flow into the second gap between the outer face of the fluid nozzle unit and the outer peripheral surface of the rotor.

2. The sealing device applied to the rotary machine according to claim 1 , wherein the fin is one of a plurality of fins arranged in the flow direction of the fluid, and the through hole is arranged on an upstream side of the flow direction of the fluid with respect to each of the fins.

3. The sealing device applied to the rotary machine according to claim 1 ,
wherein the through hole is arranged to be opened toward the rotor in the fluid nozzle unit.

4. The sealing device applied to the rotary machine according to claim 1 , wherein
the rotary machine further includes a stator vane extending from the casing in the fluid passage with a third gap communicating with the fluid passage between the stator vane and an outer peripheral surface of the rotor in the stationary body,
wherein the fin is arranged in the third gap between the stator vane and the outer peripheral surface of the rotor and a fourth gap between a rotor blade and the casing, and

wherein the through hole is arranged in the casing and the stator vane.

5. The sealing device applied to the rotary machine according to claim 1
wherein the casing of the rotary machine is configured for storing the rotor in the stationary body,
wherein the rotary machine further includes a stator vane extending from the casing in the fluid passage with a third gap communicating with the fluid passage between the stator vane and an outer peripheral surface of the rotor in the stationary body,
wherein the fin is arranged in the third gap between the stator vane and the outer peripheral surface of the rotor and a fourth gap between the rotor blade and the casing, and
wherein the through hole is arranged in the rotor and the rotor blade.

6. A sealing device applied to a rotary machine, comprising:
a fin extending from a stationary body toward a rotating body in a first gap between the stationary body and the rotating body, the fin being not in contact with the rotating body;
a through hole formed to be opened in at least one of the stationary body and the rotating body on an upstream side of the fin in a flow direction of a fluid to flow into the first gap between the stationary body and the rotating body, the through hole being opened toward an upstream side of the fluid to flow in the first gap between the stationary body and the rotating body; and
a high pressure fluid supplying unit configured to supply a high pressure fluid to the first gap between the stationary body and the rotating body from the through hole, the high pressure fluid having a higher pressure than the fluid to flow into the first gap between the stationary body and the rotating body, wherein
wherein the rotary machine includes:
a rotor extending along a rotational axis of the rotor in the rotating body,
a casing for storing the rotor in the stationary body,
a fluid passage arranged between the rotor and the casing along an extending direction of the rotor,
a stator vane extending from the casing in the fluid passage with a second gap communicating with the fluid passage between the stator vane and an outer peripheral surface of the rotor in the stationary body, and
a rotor blade extending from the rotor in the fluid passage with a third gap communicating with the fluid passage between the rotor blade and the casing in the rotating body,

wherein the fin is arranged in the second gap between the stator vane and the outer peripheral surface of the rotor and the third gap between the rotor blade and the casing,
wherein the through hole is arranged in the rotor and the rotor blade,
wherein the high pressure fluid supplying unit supplies, to the rotary machine, a high pressure fluid having a higher pressure and a lower temperature than the fluid that is supplied to the rotary machine to flow into a fourth gap between an outer face of the fluid nozzle unit and an outer peripheral surface of the rotor,
wherein the rotary machine includes a fluid nozzle unit having an annular shape that surrounds an outer circumference peripheral surface of the rotor, the fluid nozzle unit being attached to the casing with the fourth gap communicating with the fluid passage between an outer face of the fluid nozzle unit and an outer peripheral surface of the rotor, the fluid nozzle unit including a fluid nozzle chamber to which a superheated fluid being supplied and which is formed inside the fluid nozzle unit in an annular shape and an opening communicating with the fluid passage from the fluid nozzle chamber toward the extending direction of the rotor, the fluid nozzle unit being in the stationary body, and
wherein the sealing device further includes:
a supply hole that is once opened to the fourth gap between the outer face of the fluid nozzle unit and an outer peripheral surface of the rotor, and communicates with the through hole via the rotor; and
a fin extending from the fluid nozzle unit toward the rotor around a part where the supply hole is once opened to the fourth gap between the outer face of the fluid nozzle unit and the outer peripheral surface of the rot

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• NISHIKAWA Toyoharu
• Hamada Katsuhisa
• Kuwamura Yoshihiro

Classifications

• F01D11/10 Primary

  using sealing fluid, e.g. steam · CPC title

• Y02T50/60

  Efficient propulsion technologies, e.g. for aircraft · CPC title

• F01D11/001

  for sealing space between stator blade and rotor · CPC title

• F01D11/04 Primary

  using sealing fluid, e.g. steam · CPC title

• F05D2220/31

  in steam turbines · CPC title