JPS59185802A - Three-flow exhaust turbine - Google Patents

Abstract

PURPOSE:To reduce the number of parts and simplify manufacture by forming a two-flow exhaust turbine and a single-flow exhaust turbine by means of a common axle and support the axle between two trubines without using a bearing. CONSTITUTION:A two-flow exhaust turbine 21 and a single-flow exhaust turbine 22, formed by means of a common axle 25, are supported by means of bearings 26, 27 at both ends of said axle. Any bearing or coupling is not provided between two rotors 23, 24. Thus, the number of parts can be reduced and manufacture can also be simplified.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a turbine with three exhaust flow systems.

[Prior art and its problems]

In turbines such as steam turbines, the exhaust system has conventionally been one-flow, two-flow, or four-flow exhaust system. These exhaust systems are connected to the condensing turbine and the condenser at °C.

In addition, when the flow rate of the working fluid is large and the 2nd flow has a small exhaust cross-sectional area and the turbine performance is poor, and the 4th flow has an exhaust cross-sectional area that is too large and is uneconomical, the 2nd-flow exhaust cross-sectional area may be used as the 2nd flow. Even if we try to make it thicker, it is difficult with current technology to create a large low-pressure part that can accommodate this.
A third-stream exhaust system may be used.

In this case, a three-stream exhaust turbine conventionally used has a configuration as shown in FIG. 1, and a steam turbine is taken as an example. Reference numeral 1 designates a second-flow exhaust turbine section, which includes a rotor 2, an axle 3 thereof, a casing 4 covering the rotor, and bearings 5 and 6 supporting the axle. Bearings are the foundation (
(not shown). The steam supplied from the steam input lower installed in the casing is passed through two rows'H.
fi, the flow rotor is rotated from the high pressure section to the low pressure section as shown by the arrow, and each exhaust passage 8. .

It is discharged from 9. These exhaust passages communicate with a condenser (not shown). The turbine further includes a first-stream exhaust turbine section 1.
1, which has a rotor 12, its axle 13 and a casing 14.

The axle 13 is connected at one end by a coupling 15 to the shaft end of the axle 3 of the second flow exhaust turbine section, and is supported at the other end by a bearing 16 supported on the foundation. Steam inlet 1 provided in the casing
The steam supplied from "7" flows through the single rotor section from the high pressure section to the low pressure section as shown by the arrow, and is discharged through the exhaust passage 18 which communicates with the condenser.

In the above-mentioned configuration, the second-stream exhaust turbine section and the first-stream exhaust turbine section are made separately and are combined, so the number of parts such as the casing, axle, and bearings is reduced compared to the second-stream exhaust turbine section. This increases the manufacturing cost, and also increases the production cost.
Since bearings and couplings are required between the two turbine parts, the overall length of the turbine becomes long.

[Object of the Invention] It is an object of the present invention to overcome the above-mentioned disadvantages and to avoid a substantial increase in cost and size compared to two-flow exhaust systems.
It is an object of the present invention to provide a flow exhaust turbine.

[Key points of the invention]

In the present invention, the axles of the second-stream exhaust turbine section and the first-stream exhaust turbine section are formed by a common shaft, and this shaft is supported between the two turbine sections without using a bearing.

[Embodiments of the invention]

FIG. 2 shows a steam turbine 7 according to one embodiment of the present invention, which has a second-stream exhaust turbine section 21 and a first-stream exhaust turbine section 22. As shown in FIG. The rotor 23 of the second-stream exhaust turbine section and the rotor 24 of the first-stream exhaust turbine section have a common axle 25, which is supported at both ends by bearings 26, 27. There are no bearings or couplings between the two rotors 23 and 24, so the casing 28 can have a common structure for the two rotors.
Ru. The steam supply path provided in the casing 28 has two
The steam is divided into two parts, and the steam is supplied to the inlet 29 of the second-stream exhaust turbine section and the inlet 31 of the first-stream exhaust turbine section, respectively. The steam supplied from each inlet 29, 31 acts on each rotor 23, 24 as shown by the arrows, and exhaust passages 32, 33, 32, 32, 32, 32, 32, 32, 31, 31, 31, 24, 32, 31, 31, 31, 31, 31, 24, 31, 31, 31, 31, 31, 31, 35, 35, 25, 24, 24, 24, 24, 24, 22, 22, 2, , , , , , , , , , , , , , , , , , , , , , , , , , , , tion por por , t’s steam, Which is supplied from each inlet port 29, 31, acts on each rotor 23, 24, as indicated by the arrows. .

It is discharged from 34.

FIG. 3 shows a steam turbine according to another embodiment of the present invention, and components having the same properties as those shown in FIG. 2 are given the same reference numerals and their explanations will be omitted. Therefore, the parts other than the fish body described below are the same as the example shown in FIG. 2. In this example, the first-stream exhaust turbine section 220 rotor 41 is oriented in the opposite direction from the example shown in FIG.
The exhaust path and one exhaust path of the second-flow exhaust turbine section 21 form a common exhaust path 42.

〔Effect of the invention〕

As mentioned above, according to the present invention, there are no bearings or couplings between the 2IN, exhaust turbine section, and first-stream exhaust turbine section, and the casing can also have a common configuration, so the number of parts is reduced compared to the conventional one. This makes it possible to reduce the manufacturing cost and reduce the overall length.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the configuration of a conventional three-stream exhaust turbine;
The figure is an explanatory diagram of the configuration of a three-stream exhaust turbine, which is one embodiment of the present invention; FIG. 3 is an explanatory diagram of the configuration of a three-stream exhaust turbine, which is another embodiment of the present invention. 3... Axle of second flow exhaust turbine section, 13... Axle of first flow exhaust turbine section, 21... Second flow exhaust turbine section, 22... First flow exhaust turbine section, 25. ...Common axle. Patent applicant: Fuji Electric Manufacturing Co., Ltd. Figure 1 Figure 2 Figure 3' 32 4z

Claims (1)

[Scope of Claims] 1) In a third-stream exhaust turbine having a second-stream exhaust turbine section and a first-stream exhaust turbine section, an axle of the second-stream exhaust turbine section and an axle of the first-stream exhaust turbine section. A three-stream exhaust turbine, characterized in that the two are formed by a common shaft, and the shaft is pivotally supported at both shaft ends. 2. A three-stream exhaust turbine according to claim 1, characterized in that the casing covering the rotor is integrated with a common configuration.