JPH11210408A - Turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbine equipped with a rotor to which a rotor blade is arranged and an interior to surround the rotor wherein the centrifugal stress of the rotor and rotor blade is reduced and also a clearance between the rotor blade and the end of a stator blade can be easily adjusted. SOLUTION: An interior 3 is rotatively supported on a frame 4 by an interior rotation supporting part 7. A main steam inlet pipe 5 is connected to the interior 3 through a main steam inlet pipe rotating joint 8, and also a steam exhaust pipe 6 is connected to the interior 3 through a steam exhaust pipe rotating joint 9. A rotor 1 in which a rotor blade is embedded is stored in the inside of the interior 3. The interior 3 is rotated in a direction reverse to the rotational direction of the rotor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to turbines such as gas turbines and steam turbines.

[0002]

2. Description of the Related Art As an example of a conventional turbine, a steam turbine manufactured by the prior art shown in FIGS. 3 and 4 will be described. 3 and 4, reference numeral 1 denotes a rotor, on which a rotor blade 2 is implanted. The rotor 1 is surrounded by a cabin 3. The cabin 3 is attached and fixed to a gantry 4. Reference numeral 5 denotes a main steam inlet pipe, and reference numeral 6 denotes a steam exhaust pipe.

In the conventional steam turbine having the above-described configuration, only the rotor 1 and the rotor blade 2 rotate at high speed in the fixed casing 3 and generate electric power by the output. For this reason, a large centrifugal stress is generated in the rotor 1 and the rotor blade 2 by high-speed rotation, and the shape and the blade height are limited in terms of strength, and it has been difficult to manufacture blades with high efficiency.

Further, centrifugal force due to high-speed rotation acts on the rotor 1 and the moving blade 2 so that the tip of the moving blade 2 extends outwardly and comes into contact with the cabin 3, thereby hindering the safety of the moving blade 2. Was. If the gap between the tip of the rotor blade 2 and the vehicle compartment 3 is made wider in order to prevent the contact between the rotor blade 2 and the vehicle compartment 3, steam leaks more frequently, leading to a reduction in performance.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a turbine having a rotor provided with a rotor blade and a casing surrounding the rotor. It is an object of the present invention to provide a turbine that facilitates adjustment of a clearance between blade tips.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a turbine having a rotor provided with a rotor blade and a casing surrounding the rotor. A turbine structure that is configured to rotate at a speed is adopted.

[0007] In the turbine of the present invention thus configured, the casing is rotated in the direction opposite to the rotation direction of the rotor, and the rotation of only the rotor in the conventional turbine is shared by the rotation of the rotor and the casing.

[0008] Therefore, the rotation of the rotor is reduced, and the centrifugal stress acting on the rotor and the rotor blade is reduced, so that there is a margin in the strength of the rotor blade. It is possible to do.

Further, in the turbine according to the present invention, the casing is also rotated, and a centrifugal force acts on the casing, and the centrifugal stress causes the casing to extend outward. Therefore, the gap between the cabin and the rotor blades can be adjusted by adjusting the rotation speeds of the casing and the rotor so that the elongation amounts of the cabin and the rotor blades due to the centrifugal stress become equal.

[0010] This also reduces the possibility of contact between the bucket and the cabin. In addition, the gap between the rotor blades and the cabin can be adjusted to be smaller than that of a conventional turbine, and the performance of the turbine can be improved by reducing the amount of steam leakage at the tips of the rotor blades.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A turbine according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. In the steam turbine of FIGS. 1 and 2, the same parts as those of the configuration of the steam turbine shown in FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description thereof will be omitted.

In the steam turbine shown in FIGS. 1 and 2, the cabin 3 is rotatably supported on a gantry 4 by a cabin rotation support portion 7. Reference numeral 8 denotes a rotary joint of the main steam inlet pipe, which is provided between the main steam inlet pipe 5 and the passenger compartment 3.

Reference numeral 9 denotes a steam exhaust pipe rotary joint, which is provided between the steam exhaust pipe 6 and the vehicle interior 3. The other configuration is substantially the same as the configuration of the steam turbine shown in FIGS.

The steam turbine according to the present embodiment has the above-described structure. When the steam flowing from the main steam inlet pipe 5 into the passenger compartment 3 acts on the rotor blades 2, the rotor 1 rotates. The cabin 3 rotatably supported by the cabin rotation support 7 is rotated in a direction opposite to the rotation direction of the rotor 1 by a reaction of the rotation of the rotor 1.

After rotating the rotor 1, the steam flows out through the steam exhaust pipe 6. Main steam inlet pipe 5 and steam exhaust pipe 6
Is stationary, but a main steam inlet pipe rotating joint 8 and a steam exhaust pipe rotating joint 9 are respectively provided between the rotating casing 3 and the steam leaking into the casing 3. It can be supplied and exhausted without.

In the turbine according to the present embodiment, a centrifugal force acts on the casing 3 by rotating the casing 3 so that the casing 3 also extends outward. The amount of elongation of the cabin 3 due to this centrifugal stress is ΔC
Further, the amount of extension of the moving blade 2 to the outside due to the rotation of the moving blade 2 is defined as ΔR. The casing 3 and the rotor 1 are extended by the same amount by adjusting the rotation speeds of the casing 3 and the rotor such that the amount of extension becomes ΔR = ΔC.

Therefore, as in the conventional turbine, ΔC = 0
In this case, it is easier to adjust the gap between the casing 3 and the moving blade 2 than in the case where only ΔR occurs, and the possibility that the casing 3 and the moving blade 2 come into contact with each other is reduced.

As a result, the turbine 3
The gap between the rotor and the rotor blade 2 can be made narrower than that of a conventional turbine. As a result, the amount of steam leakage at the tip of the rotor blade 2 can be reduced, so that turbine performance can be improved.

Further, according to the present turbine, the rotation of the vehicle
And the rotor 1, the centrifugal stress acting on the wing 2 is reduced as compared with the case where only the rotor 1 is rotated, so that the strength can be afforded and a high-performance wing such as a wing having a high wing height can be manufactured. .

For example, conventionally, only the rotor is 3600 RP
Considering the case where the rotor is rotating at M, the centrifugal stress caused by the rotation of the casing 3 in the turbine is also assumed to be 1800 RPM, and the rotation of the casing 3 is 1800 RPM. ), The ratio of the centrifugal stress between the conventional turbine and the turbine of the present invention is (1800/3600) ² = 0.25 and ４.
This shows the advantage of the turbine according to the present invention.

[0021]

As described above, the turbine according to the present invention is constructed such that the casing rotates in the direction opposite to the rotation direction of the rotor, and the rotation of the turbine is shared by the rotor and the casing. Therefore, the rotation of the rotor is reduced, and the centrifugal stress acting on the rotor and the rotor blades is reduced, and there is a margin in the strength of the rotor blades. It becomes possible.

Further, in the turbine according to the present invention, the casing also extends outward by rotation. Therefore, by adjusting the rotational speeds of the casing and the rotor so that the elongation amount of the casing and that of the rotor blade due to the centrifugal stress are equal, the casing and the casing are adjusted. The gap between the moving blades can be adjusted, and the gap can be adjusted to be narrower than that of a conventional turbine, and the performance of the turbine can be improved by reducing the amount of steam leakage at the tip of the moving blade.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a steam turbine according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along the line II-II of FIG.

FIG. 3 is a side view showing a schematic configuration of an example of a conventional steam turbine.

FIG. 4 is an enlarged sectional view taken along the line IV-IV in FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rotor 2 rotor blade 3 casing 4 gantry 5 main steam inlet pipe 6 steam exhaust pipe 7 casing rotating support section 8 main steam inlet pipe rotating joint 9 steam exhaust pipe rotating joint

Claims (1)

[Claims] 1. A turbine having a rotor provided with a rotor blade and a casing surrounding the rotor, wherein the casing is configured to rotate in a direction opposite to a direction in which the rotor rotates. Turbine.