JP2593371Y2 - Partition plate flow guide - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow guide mounted on a partition plate of each stage of a turbine.

[0002]

2. Description of the Related Art FIGS. 3 to 5 are schematic views of a conventional steam turbine cabin. The partition plate 02 is fitted in the vehicle compartment 01, and the flow guide 04 is cut out integrally with the partition plate 02 or joined at the welded portion 05. A radial fin 06 is attached to the flow guide 04.

[0003] The steam flows out of the nozzle 08 and the rotor 09
The operating energy is transmitted to the blades 07 attached to the blades, and the rotor 09 is rotated. Steam turbines generally consist of multiple stages of nozzles and grades, with seals 010 between stages.
There is.

[0004]

The conventional structure is shown in FIGS. 3 to 5, and the flow guide is cut out integrally with the partition plate or attached by full penetration welding, so that the material cost or processing cost is reduced. This can be a costly factor.

If the welding method of the flow guide is simplified to fillet welding or the like, thermal stress due to the difference in heat capacity between the partition plate and the flow guide acts on the welded portion due to a sudden change in steam temperature (during a load rejection test, etc.). In some cases, the blade may break, and the flow guide may come into contact with the blade, possibly causing an accident. And other issues.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. A groove is provided at a flow guide mounting position of a partition plate in a circumferential direction, and a flow guide is provided in the groove between both side partition plates. This is a flow guide for a partition plate into which a flow guide longer than the distance is inserted and fixed.

[0007]

By providing a groove in the partition plate and inserting a flow guide into the groove, the thermal stress at the time of sudden change in steam temperature is directly transmitted from the flow guide as a compressive stress of the spigot portion of the partition plate, thereby simplifying the joining. .

In order to prevent the flow guide from coming out of the groove of the partition plate and coming into contact with the blade even if the joint such as welding or a set screw is broken, the length of the flow guide is set on both sides of the partition plate. It is longer than the distance.

[0009]

1 to 3 show an embodiment of the present invention.
1 is a cabin, 2 is a disk-shaped partition plate fitted to the cabin 1, 3
The circumferential grooves of uniform width, which is provided in the partition plate 2, 4 denotes a flow guide, is inserted into the groove 3 in the axial direction, it is fixed by fillet welding 5 intermittently.

The length A of the flow guide 4 inserted in the groove 3
Is longer than the distance B from the next partition plate 2 ′, and the flow guide 4 is provided with radial fins 6.

[0011]

[Effect of the invention] The present invention is Ri said structural der, flow guide
The retainer in the axial direction is the gap between the next partition plate and the flow guide.
It can be realized by increasing the depth of the groove of the partition plate compared to
In addition, the mounting structure of the flow guide has been simplified, and the structure is
However, there is an effect that it is simple, the work is quick, and the cost can be largely reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of a flow guide according to an embodiment of the present invention.

FIG. 2 is a perspective view of a mounting portion of the flow guide of FIG. 1;

FIG. 3 is a schematic view of a turbine cabin in a conventional example.

FIG. 4 is a detailed view of a portion C in FIG. 3;

FIG. 5 is a sectional view taken along line DD of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cabin 2, 2 'Partition plate 3 Groove 4 Flow guide 5 Fillet welding 6 Radial fin

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F01D 25/24 F01D 11/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A groove is provided in a circumferential direction at a flow guide mounting position of a partition plate, and a flow guide longer than a distance between both partition plates on which the flow guide is installed is inserted and fixed in the groove. Partition plate flow guide.