초록 ▼

A valve (6) for supplying the external air to the inside of an upper casing (5a) is provided to the upper casing (5a), and when the operation of a gas turbine is stopped, the external air is introduced from the upper casing (5a) to the inside of the casing (5). When the external air is introduced fr

A valve (6) for supplying the external air to the inside of an upper casing (5a) is provided to the upper casing (5a), and when the operation of a gas turbine is stopped, the external air is introduced from the upper casing (5a) to the inside of the casing (5). When the external air is introduced from the upper casing (5a), the upper casing (5a) is cooled to prevent thermal deformation of the casing (5).

대표청구항 ▼

What is claimed is: 1. A casing comprising: an upper casing which covers an upper half of a rotating body being rotated by high temperature fluid; a lower casing which covers a lower half of the rotating body; a valve which controls supply of cooling air cooling the upper casing; a first cooling ai

What is claimed is: 1. A casing comprising: an upper casing which covers an upper half of a rotating body being rotated by high temperature fluid; a lower casing which covers a lower half of the rotating body; a valve which controls supply of cooling air cooling the upper casing; a first cooling air flow path where the cooling air flows is provided to the upper casing and is constructed by the upper casing and the lower casing; and an air inlet port which introduces the cooling air being supplied from the valve to the first cooling air flow path is formed in a shape of a nozzle to have an end thereof on a side of an inner wall surface of the upper casing tapered; wherein, after stopping operation of the rotating body by the high temperature fluid, the valve is opened so as to introduce the cooling air to the first cooling air flow path from the air inlet port. 2. A casing comprising: an upper casing which covers an upper half of a rotating body being rotated by high temperature fluid; a lower easing which covers a lower half of the rotating body; a valve which controls supply of cooling air cooling the upper casing; a first cooling air flow path where the cooling air flows is provided to the upper casing and is constructed by the upper casing and the lower casing; an air inlet port which introduces the cooling air being supplied from the valve to the first cooling air flow path; and a cooling air supply pipe which supplies an interior of the rotating body with the cooling air being supplied from the air inlet port to an interior of the casing in order to cool the rotating body is installed to an outer wall surface of the rotating body on a side of the upper casing; wherein, after stopping operation of the rotating body by the high temperature fluid, the valve is opened so as to introduce the cooling air to the first cooling air flow path from the air inlet port. 3. A casing comprising: an upper casing which covers an upper half of a rotating body being rotated by high temperature fluid; a lower casing which covers a lower half of the rotating body; a valve which controls supply of cooling air cooling the upper casing; a first cooling air flow path where the cooling air flows is provided to the upper casing and is constructed by the upper casing and the lower casing; an air inlet port which introduces the cooling air being supplied from the valve to the first cooling air flow path; a cover in a shape of approximately semicircle which covers the upper casing; and a second cooling air flow path where the cooling air flows from the valve is formed between an inner wall surface of the cover and an outer wall surface of the upper casing; wherein, after stopping operation of the rotating body by the high temperature fluid, the valve is opened so as to introduce the cooling air to the first cooling air flow path from the air inlet port, and the cooling air is introduced from the air inlet port to the second cooling air flow path. 4. A casing comprising: an upper casing which covers an upper half of a rotating body being rotated by high temperature fluid; a lower easing which covers a lower half of the rotating body; a valve which controls supply of cooling air cooling the upper easing; a first cooling air flow path where the cooling air flows is provided to the upper casing and is constructed by the upper casing and the lower casing; and an air inlet port which introduces the cooling air being supplied from the valve to the first cooling air flow path; wherein, the air inlet port comprises: a suction port which is provided to a side of an outer wall surface of the upper casing and connected to the first cooling air flow path from the valve; an injection port which is provided to a side of an inner wall surface of the upper casing and injects the cooling air to an interior of the casing; an air-introduction slot which is provided to a side of outer wall of the upper casing and connects the suction port and the injection port; and a cover which covers the air-introduction slot; and wherein, after stopping operation of the rotating body by the high temperature fluid, the valve is opened so as to introduce the cooling air to the first cooling air flow path from the air inlet port. 5. A casing as described in claim 4: wherein, the air inlet port is provided so as to have an end thereof on a side of an inner wall surface of the upper casing face toward a heat source inside the casing. 6. A casing as described in claim 4: wherein, the air inlet port is provided so as to have an end thereof on a side of an inner wall surface of the upper casing face toward an inner wall surface of the upper casing. 7. A casing as described in claim 4: wherein, the air inlet port is formed in a shape of a nozzle to have an end thereof on a side of inner wall surface of the upper casing tapered. 8. A casing as described in claim 4: wherein, a cooling air supply pipe that supplies an interior of the rotating body with the cooling air being supplied from the air inlet port to an interior of the casing in order to cool the rotating body is installed to an outer wall surface of the rotating body on a side of the upper casing. 9. A casing as described in claim 4: wherein, a cover in a shape of approximately semicircle which covers the upper casing is provided; a second cooling air flow path where the cooling air flows from the valve is formed between an inner wall surface of the cover and an outer wall surface of the upper casing; and the cooling air is introduced from the air inlet port to the second cooling air flow path. 10. A casing comprising: an upper casing which covers an upper half of a rotating body being rotated by high temperature fluid; a lower casing which covers a lower half of the rotating body; a valve which controls supply of cooling air cooling the upper casing; a first cooling air flow path where the cooling air flows; and an air inlet port which introduces the cooling air being supplied from the valve to the first cooling air flow path; wherein, after stopping operation of the rotating body by the high temperature fluid, the valve is opened so as to introduce the cooling air to the first cooling air flow path from the air inlet port, wherein, the rotating body comprises a compressor and a turbine that have rotating blades installed to a periphery thereof; such a combustor is provided as rotates the turbine by supplying the turbine with combustion gas being obtained by burning a fuel with an air compressed by the compressor; and the casing comprises a compressor casing housing the compressor, a combustor casing housing the combustor and a turbine casing housing the turbine. 11. A casing as described in claim 10: wherein, the air inlet port is installed to a portion of the upper casing where the combustor casing is formed; and the cooling air is introduced from the valve to the combustor casing. 12. A casing as described in any one of claims 1 to 3: wherein, a cover in a shape of approximately semicircle which covers the upper casing is provided; a second cooling air flow path where the cooling air flows from the valve is formed between an inner wall surface of the cover and an outer wall surface of the upper casing; and the cooling air is introduced from the air inlet port to the second cooling air flow path. 13. A casing comprising: an upper casing which covers an upper half of a rotating body being rotated by high temperature fluid; a lower casing which covers a lower half of the rotating body; a valve which controls supply of cooling air cooling the upper casing; a first cooling air flow path where the cooling air flows; and an air inlet port which introduces the cooling air being supplied from the valve to the first cooling air flow path; wherein, after stopping operation of the rotating body by the high temperature fluid, the valve is opened so as to introduce the cooling air to the first cooling air flow path from the air inlet port, wherein, control air of a plant is diverged so as to be supplied to the valve as the cooling air. 14. A gas turbine comprising: a compressor which compresses external air; a combustor which burns a fuel by using air being compressed by the compressor; a turbine which is rotated by being supplied with combustion gas being obtained by the combustor; a casing as in any one of claims 1 to 9 which cover the compressor, the combustor and the turbine, respectively, having the rotating body comprise a compressor and a turbine that have rotating blades installed to a periphery thereof; and a control system which controls a temperature difference between the upper casing and the lower casing so as to be reduced by opening the valve and introducing the cooling air to the air inlet port after stopping operation. 15. A gas turbine as described in claim 14: wherein, the control system controls the temperature difference, by controlling a flow of the cooling air being supplied to the air inlet port from the valve. 16. A gas turbine as described in claim 15: wherein, the control system is provided with temperature-detecting portions, which detect at least one of temperatures of the upper casing and the lower casing; and a flow of the cooling air being supplied to the air inlet port from the valve is controlled on the basis of each of temperatures of the upper casing and the lower casing that are detected by the temperature-detecting portions. 17. A gas turbine as described in claim 15: wherein, the control system is provided with a timer for measuring a time after operation is stopped; and a flow of the cooling air being supplied to the air inlet port from the valve is controlled on the basis of a time that is measured by the timer. 18. A gas turbine as described in claim 14: wherein, an inlet guide vane that can change an opening thereof is provided to the compressor; and a flow of the cooling air being introduced into an interior of the easing is adjusted, by controlling an opening of the inlet guide vane. 19. A gas turbine as described in claim 14: a bypass-valve is provided to a transition piece at art end of the combustor; and a flow of the cooling air streaming through a combustor casing where the combustor is provided is adjusted, by changing over an opening of the bypass valve.