JP2594841Y2 - High and medium pressure turbine cabin - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing of a high-to-medium pressure turbine.

[0002]

2. Description of the Related Art FIG. 2 shows an example of the structure of a conventional high and medium pressure turbine casing. In FIG. 2, steam supplied from a boiler (not shown) flows in from main steam pipe 1 and
And expansion and work are performed in the high pressure turbine stage 3. The high-pressure exhaust steam is guided from the high-pressure turbine outlet 4 to the boiler via the high-pressure turbine outlet pipe 5.

[0003] The steam reheated by the boiler flows through an intermediate-pressure turbine inlet pipe 6 and expands in an intermediate-pressure turbine 7.
It performs work and flows out of the medium-pressure turbine exhaust pipe 8 and is led to a low-pressure turbine (not shown).

[0004]

In the conventional high-to-medium pressure turbine described above, the high-pressure turbine exhaust chamber 9 and the space 15 communicating with the outlet 11 of the high-pressure dummy 10 are separated by the high-pressure outer casing 12 and the high-pressure inner casing 13. Through a circumferential slit 14 provided between them.

[0005] The space 15 comprises a high-pressure outer casing 12 and a high-pressure inner casing 1.
A large kina chamber surrounded by 3, is a circumferentially uniform pressure distribution, in the high pressure turbine exhaust chamber 9, above, pressure distribution between off chamber differs due to the influence of the high pressure turbine exhaust steam flow ing. In FIG. 2, the pressure in the upper compartment is higher than that in the lower compartment. Therefore, the differential pressure of the slit 14 is different between the upper and lower compartments, and the flow rate balance is different. As a result, there is a disadvantage that the temperature distribution between the upper and lower compartments differs.

If there is a temperature difference between the upper casing and the lower casing, the outer casing 12, the inner casing 13 and the like are deformed due to the difference in thermal expansion, so that the clearance of each part of the turbine changes in the circumferential direction. , Fin contact, excessive clearance,
There is a problem that causes a decrease in performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and in a high-medium pressure turbine cabin, deformation of the cabin due to a temperature difference between an upper cabin and a lower cabin is prevented. The purpose is to do.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a high-medium-pressure turbine casing that is surrounded by a turbine outer casing and an inner casing and communicates with a high-pressure dummy outlet. At least one balance pipe communicates with the high-pressure turbine exhaust chamber between the upper and lower passenger compartments, and a flow control valve is provided in the middle of each balance pipe.

[0009]

According to the above-mentioned means, by adjusting the opening of the flow control valve provided in the balance pipe, it is possible to make the flow rates of the upper and lower vehicle compartments uniform. When the flow rate becomes uniform, there is no difference in temperature between the upper and lower vehicle compartments, a uniform temperature distribution is obtained, and deformation of the vehicle compartment can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to FIG. In FIG. 1, the same parts as those shown in FIG. 2 are denoted by the same reference numerals, and duplicate description will be omitted.

In FIG. 1, the pressure distribution between the upper and lower casings of the high-pressure turbine outlet 4 causes the outer casing 12 of the turbine.
Outlet section 11 of high-pressure dummy 10 surrounded by
The pressure difference between the upper and lower vehicle compartments is different between the upper and lower vehicle compartments , through the space 15 that communicates with the high pressure turbine exhaust chamber 9.
The flow rates at the slits 14 are different. In some cases, the flow direction of the slit 14 is different between the upper and lower passenger compartments.

In this embodiment, therefore, the slit 14
Is completely sealed, and the balance pipes 16 having the slit function are provided on the upper and lower passenger compartment sides, respectively.
And a flow control valve 17 is provided at an intermediate portion of the balance pipe 16 so that the flow path resistance can be changed in order to adjust the flow rate.

That is, a high-pressure dummy surrounded by a turbine outer casing 12 and an inner casing 13 in a high- medium-pressure turbine casing.
One or a plurality of balance pipes 16 are provided in the upper and lower compartments to communicate the space 15 communicating with the outlet portion 11 of the high pressure turbine exhaust chamber 9, and a flow control valve 17 is provided at an intermediate portion of each of the balance pipes 16. It is provided. And the slit 14 provided on the circumference is completely sealed.

By installing such a balance pipe 16 having a flow control valve 17, a flow control valve provided in the balance pipe 16 is provided with a flow imbalance caused by a pressure imbalance between the upper and lower chambers of the high-pressure turbine exhaust chamber 9. 17 can be reduced by adjusting the opening degree. as a result,
The high-pressure dam is surrounded by the outer casing 12 and the inner casing 13 of the turbine.
In the space 15 communicating with the outlet 11 of the -10, a steam flow having substantially the same flow rate distribution is obtained between the upper and lower cabin, the temperature difference between the upper and lower cabin is almost eliminated, and the deformation of the cabin occurs. Absent.

[0015]

As described above, according to the present invention, according to the present invention, the balance that communicates with the high-pressure turbine exhaust chamber the space that is surrounded by the outer casing and the inner casing of the high- and medium-pressure turbine casing and communicates with the high- pressure dummy outlet. At least one pipe is provided in each of the upper and lower compartments, and by adjusting the opening degree of the flow control valve provided in the middle part of each balance pipe, the flow rate between the upper and lower compartments is made uniform to eliminate the temperature difference. As a result, it is possible to prevent deformation of the cabin, thereby properly maintaining the clearance of each part of the turbine, prevent turbine performance from deteriorating due to an increase in leakage, etc., and improve reliability. Is done.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a high- and medium-pressure turbine casing according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional high and medium pressure turbine casing.

[Explanation of symbols]

 9 High-pressure turbine exhaust chamber10 High-voltage dummy 11 High-pressure dummy outlet  12 Turbine outer casing 13 Turbine inner casing 15 Surrounded by outer and inner casingsThrough the high-pressure dummy outlet
PervertSpace 16 Balance pipe 17 Flow control valve

Claims (1)

(57) [Scope of request for utility model registration] 1. A high- and medium-pressure turbine casing, which is surrounded by a turbine outer casing and an inner casing and communicates with a high-pressure turbine exhaust chamber through a space communicating with a high- pressure dummy outlet, is provided at least one balance pipe in each of the upper and lower casings. A high-to-medium pressure turbine casing, wherein a flow regulating valve is provided at an intermediate portion of each balance pipe.