JPS60156902A - Turbine rotor - Google Patents

Abstract

PURPOSE:To aim at a reduction in wear and loss of a thrust collar, by forming one side of an axial fitting surface between a turbine rotor and the thrust collar into a convex part and the out side into a concave part, respectively, while making up a stepped part on the fitting surface of an axial cross section. CONSTITUTION:One side of an axial fitting surface between a turbine rotor 1 and a thrust collar 2 is formed into a convex part 3a, and the other side into a concave part 3b, respectively, while a stepped part is made up on the fitting surface of an axial cross section, and the turbine rotor 1 and the thrust collar 2 are joined together. With this constitution, they are sufficiently able to cope with axial torsion in an axial thrust and a sense of rotation, thus wear and loss in the thrust collar 2 is well reducible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a turbine rotor, and more particularly to an improvement of a turbine rotor to suitably prevent damage to a thrust car connected to the turbine rotor.

[Technical background of the invention and its problems] Generally, steam turbine equipment has a turbine high pressure section, a turbine intermediate pressure section, and a turbine low pressure section, and these turbine sections are connected by a turbine rotor that is a common shaft. There is. Further, since the turbine rotor has a long axis, it is supported by journal bearings disposed between each part of the turbine, and the shaft center of the rotor is suitably adjusted. Furthermore, since each part of the turbine rotates under the impact force of steam, thrust is generated in the direction of steam flow, so a thrust bearing is installed to suppress the thrust. A thrust car is loosely connected to the rotor.

By the way, in recent years, steam turbine equipment is increasingly using ultra-high pressure and ultra-high temperature steam, and with this, for example, chromium 8
A heat-resistant steel containing ~14% is used. however,
Although heat-resistant steel has excellent mechanical strength in a high temperature range, it has the disadvantage of being inferior in heat conduction properties and bearing friction properties. As a result, the thrust collar could seize on or be damaged by the thrust bearing.

As a method to eliminate this inconvenience, overlay welding is performed on the pressure receiving surface of the thrust collar that contacts the thrust bearing,
Although it is possible to use a cover made of alloy steel with a relatively low chromium content, the heat from welding remains on the thrust collar for many minutes, which is unfavorable in terms of mechanical strength, or during the rotation of the turbine rotor. This is not a permanent countermeasure because it causes unnecessary distant stress 1 and leads to wear and tear on the thrust collar.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a turbine rotor having a relatively simple structure and a thrust collar with relatively little wear and tear.

[Summary of the invention]

In order to achieve the above object, the present invention has a turbine rotor and a thrust collar in which one side is formed as a convex part and the other side is formed as a concave part on the axial fitting surface, and the turbine rotor and the thrust collar are formed in the axial cross section. The fitting surface with the thrust collar is characterized by being formed in a stepped portion.

Examples of the invention] An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Fig. 1, the reference numeral (1) indicates the longitudinal direction of the axis of the turbine rotor, and a concave part (3b) is cut into an annular shape on the periphery of the shaft, and the - side of the thrust collar (2) that fits into this part is convex. Department (
3a), and these irregularities are located alternately. Note that the symbol (4a) indicates a bolt hole.

As shown in Fig. 2, the fitting in the axial cross section is achieved by forming a protrusion (5) on the periphery of the thrust collar (2) and a notch (6) on the periphery of the turbine rotor (1). These are joined while forming a stepped portion. The thrust collar (2) is also divided by a connecting surface (7), the forces of which are connected by bolts (4).

Thus, the turbine rotor (1) and the thrust collar (2
) are fitted with unevenness in the axial direction as described above, and the shaft cross section is joined by forming a step, so rotational force such as thrust and shaft twisting acts on the turbine rotor. However, it can withstand these forces.

FIG. 3 shows another embodiment of the turbine rotor according to the present invention. In this example, the streak color (
2), and after engaging the thrust collar (2) with the key (9) implanted in the turbine rotor (1) in advance, Projection (3d
) is fitted into the turbine rotor (1).

In this case as well, the structure is intended to suppress the thrust generated in the axial direction and also to limit the axial twist. In addition, the thrust collar (2) is divided at the connecting surface (7),
Connection surface (forces are connected by bolts (4).

〔Effect of the invention〕

As explained above, when the thrust collar is joined to the turbine rotor, the present invention is configured to perform fitting by unevenness and step joining so that the thrust collar can be firmly connected in the axial direction and in the cross section of the shaft. It is possible to sufficiently resist thrust in the direction of thrust and axial torsion f in the direction of rotation of the shaft, and therefore it is expected that wear and tear of this type of thrust collar can be suppressed.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing a partial cutout of a turbine rotor according to the present invention, FIG. 2 is a schematic front view of FIG. 1, and FIG. 3 is a schematic side view showing another embodiment of the present invention. Figure 4 is the third
FIG. 3 is a schematic front view of the figure. 1...Turbine rotor 2...Thrust collar 3a...Convex part 3b...Concave part 5...Protrusion part 6...Notch part 9...Key representative patent attorney Noriyuki Chika ( #1 or 1 person) Figure 1 Figure 2 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) The turbine rotor and the thrust collar have a convex portion on one side and a concave portion on the other side on their axial fitting surfaces, and one side has a flat fitting surface in the axial cross section. (2) The turbine rotor and thrust collar are