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On-off valve device and rotary machine

  • US 10,450,887 B2
  • Filed: 08/27/2014
  • Issued: 10/22/2019
  • Est. Priority Date: 08/27/2014
  • Status: Active Grant
First Claim
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1. An on-off valve device comprising a valve body which is disposed in a suction flow path which leads from an inflow port of a housing covering a turbine rotor blade to a scroll portion and is configured of a single piece or multiple divided pieces to supply a fluid to the turbine rotor blade with an inner surface of the suction flow path formed using a first wall surface and a second wall surface facing the first wall surface as a portion of the suction flow path, extends from the upstream side toward the downstream side of the flow of the fluid, is rotatably provided in the housing in a direction toward and away from the first wall surface and the second wall surface, forms an upstream-side narrowed flow path between the first wall surface and the valve body at an end on the upstream side, and forms a downstream-side narrowed flow path between the second wall surface and the valve body at an end on the downstream side;

  • anda rotary portion configured to rotate the valve body about an axis which is a rotation center of the valve body,wherein in the rotary portion, the axis is positioned outside the valve body,wherein in the valve body, the end on the upstream side is an end facing the first wall surface, and the end on the upstream side is formed of a first surface which gradually goes away from the first wall surface after gradually approaches the first wall surface from the upstream side toward the downstream side, andwherein the valve body includes a second surface which faces the second wall surface at the end on the downstream side,wherein the valve body is fully opened when the first surface is parallel to the first wall surface,the valve body is fully closed when the leading edge of the valve body comes into contact with the first wall surface along with the trailing edge comes into contact with the second wall surface,the opening degree of the valve body is indicated as an inclination angle of the trailing edge of the valve body in a direction from the first wall surface to the second wall surface,in an intermediate opening degree of the valve body between a fully close condition and a fully open condition of the valve body, the leading edge of the valve body approaches the first wall surface and the trailing edge approaches the second wall surface.

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