Emergency shutoff device and emergency shutoff system provided with same

Patent metadata

Field	Value
Publication number	US-10443513-B2
Application number	US-201415528954-A
Country	US
Kind code	B2
Filing date	Nov 26, 2014
Priority date	Nov 26, 2014
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

The emergency shutoff device is provided with a casing ( 21 ) in which inflow ports ( 22 ) through which control oil flows into a space (A 1 ) provided therein and a plurality of outflow ports ( 23 ) through which the control oil flows outside of the space (A 1 ) are formed; and a switching unit ( 24 ) configured to slide along an inner circumferential surface of the casing ( 21 ) in which the space (A 1 ) is formed, to change its position relative to the plurality of outflow ports ( 23 ), and thus to switch a circulation state of the control oil in the space (A 1 ). The switching unit ( 24 ) switches the circulation state between the first circulation state in which the control oil is circulated from a first inflow port ( 221 ) to a first outflow port ( 231 ) and the third circulation state in which an open and closed state of a test outflow port ( 236 ) is switched while the control oil is being circulated from the first inflow port ( 221 ) to the first outflow port ( 231 ).

First claim

What is claimed is:

1. An emergency shutoff device comprising:
a casing in which an inflow port through which control oil flows into a space provided therein and a plurality of outflow ports through which the control oil flows outside of the space are formed; and
a switching unit configured to slide along an inner circumferential surface of the casing in which the space is formed, to change its position relative to the plurality of outflow ports, and thus to switch a circulation state of the control oil in the space,
wherein the casing includes, as the plurality of outflow ports,
a first outflow port through which the control oil flowing into the space through the inflow port flows out and the control oil reversely flows into the space,
a second outflow port through which the control oil flowing into the space through the inflow port flows out,
a discharge port through which the control oil reversely flowing into the space through the first outflow port is discharged, and
a test outflow port, an open and closed state of which is switched through the switching unit when an operation test is performed, and
wherein the switching unit switches the circulation state between
a first circulation state in which the control oil is circulated from the inflow port to the first outflow port,
a second circulation state in which the control oil is circulated from the inflow port to the second outflow port and the control oil reversely flowing from the first outflow port is circulated to the discharge port, and
a third circulation state in which the open and closed state of the test outflow port is switched while the control oil is being circulated from the inflow port to the first outflow port.

2. The emergency shutoff device according to claim 1 , wherein the first outflow port is connected to a stop valve communicating pipe connected to a stop valve configured to shut off a supply of steam to a steam turbine by discharging the control oil filling an inside thereof,
the second outflow port is connected to a regulating valve communicating pipe connected to a regulating valve configured to adjust a supply amount of steam to the steam turbine, and
the discharge port is connected to a casing discharge pipe configured to discharge the control oil in the space to the outside, and
wherein the switching unit is switched from the first circulation state to the second circulation state when the steam turbine is urgently stopped and is switched from the first circulation state to the third circulation state when an operation test is performed.

3. The emergency shutoff device according to claim 1 , wherein the first outflow port is connected to an internal communicating pipe communicating with an inside of an oil cylinder of a stop valve configured to shut off a supply of steam to a steam turbine by discharging the control oil filling an inside thereof,
the second outflow port is connected to a casing discharge pipe through which the control oil in the space is discharged to the outside, and
the discharge port is connected to a stop valve discharge pipe through which the control oil inside the oil cylinder of the stop valve is discharged to the outside, and
wherein the switching unit is switched from the first circulation state to the second circulation state when the steam turbine is urgently stopped and is switched from the first circulation state to the third circulation state when an operation test is performed.

4. An emergency shutoff system comprising:
a stop valve configured to shut off the supply of steam to a steam turbine by discharging a control oil filling an inside thereof;
a regulating valve configured to adjust a supply amount of steam to the steam turbine; and
the emergency shutoff device according to claim 2 .

5. An emergency shutoff system comprising:
a stop valve configured to shut off the supply of steam to a steam turbine by discharging a control oil filling an inside thereof;
a regulating valve configured to adjust a supply amount of steam to the steam turbine; and
the emergency shutoff device according to claim 3 .

6. The emergency shutoff system according to claim 4 , wherein a plurality of emergency shutoff devices are arranged in parallel.

7. The emergency shutoff system according to claim 5 , wherein a plurality of emergency shutoff devices are arranged in parallel.

Assignees

• Mitsubishi Heavy Ind Compressor Corp
• Mitsubishi Ind Compressor Corporation

Inventors

• Niiyama Takashi
• NISHITANI Ken
• Kawashima Hirokazu
• Jain Abhay

Classifications

• F01D21/18

  involving hydraulic means · CPC title

• F05D2260/83

  Testing, e.g. methods, components or tools therefor · CPC title

• F15B19/00

  Testing; {Calibrating; Fault detection or monitoring; Simulation or modelling of} fluid-pressure systems or apparatus not otherwise provided for · CPC title

• F02C9/46 Primary

  Emergency fuel control · CPC title

• F01D21/003

  Arrangements for testing or measuring (for measuring vibrations G01H) · CPC title