JPH01216004A - Supporting device for steam turbine diaphragm - Google Patents

Abstract

PURPOSE:To prevent movement of a diaphragm by inserting spacers in space between back faces of supporting bars and back faces of supporting bar grooves in a casing, in a supporting device which is attached to a lower half diaphragm of a steam turbine diaphragm that is divided into an upper half and a lower half. CONSTITUTION:Supporting bar grooves 3 are provided in the vicinity of a horizontal surface of a lower half diaphragm 2 of a steam turbine diaphragm which is divided into an upper half and a lower half. Supporting bars 4 whose thickness are larger than outer diameter of the diaphragm are fixed to the supporting bar grooves 3 by bolts 5. Shims 8 are installed between bottoms 7 of the supporting bar grooves which are provided in a lower half casing 6 and the supporting bars 4, and projecting parts 9 of the supporting bars 4 are set on th shims 8, so that the lower half diaphragm 2 is set in the lower half casing 6. In such a supporting device, spacers 13 are interposed in the space 12 between back faces 10 of the supporting bars and back faces 11 of the supporting bar grooves which are provided in the lower half casing 6, so that the movement of the lower half diaphragm 2 in the right and left directions is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support device for a steam turbine diaphragm, and in particular, to reduce stress on a center pin that holds the diaphragm's left-right axis, and to reduce the stress on the center pin groove of the diaphragm. This invention relates to a diaphragm support device that prevents damage.

[Conventional technology]

The conventional support device shown in Fig. 4 is
As described in Japanese Patent No. 764, a support bar 4 having a thickness larger than the outer diameter of the diaphragm is fixed to a support bar groove 3 provided near the horizontal surface of the lower half diaphragm 2 with a bolt 5, and the lower half diaphragm 2 is fixed with a bolt 5. The support bar is set at the bottom of a groove 7 provided in the chamber 6. A shim 8 is installed between the support bar and the bottom of the support bar groove provided in the vehicle compartment, and by adjusting the thickness of this shim, the diaphragm can be adjusted in the upward and downward directions with respect to the rotor 1 (Fig. 1). The axis position is adjusted. However, since there is a large gap 12 between the back of the support bar and the back of the support bar groove provided in the vehicle compartment, the diaphragm may be damaged by vibrations during turbine operation or by steam force, causing the outer diameter of the diaphragm to change from the diameter of the vehicle interior. This does not prevent movement within the 2-3 m gap 14 provided between the two.

On the other hand, as described in Japanese Publication No. 85-16158 and shown in FIG. The center pin groove 17 provided in the diaphragm 2 is fitted into each other, and has the role of maintaining the left and right axis of the lower half diaphragm 2 with respect to the rotor 1. In this structure, the diaphragm floats due to steam force. It doesn't prevent it. That is, the former is a device for holding the diaphragm in the upper and lower directions of the axis relative to the rotor, and the latter is a device for holding the left and right directions, and each is an independent device.

[Problem to be solved by the invention]

In the above conventional technology, the axis adjustment for the diaphragm Φ rotor was provided independently for the upper and lower holding devices and the left and right holding devices. In the support device, there is a gap of 0.02 to 0 between the center pin and the center pin groove due to the necessity of assembly and disassembly work.
．． Since a gap of 0.7 mm is provided, the center pin and the center pin groove repeatedly collide with each other due to minute vibrations during turbine operation, which causes the problem that the center pin groove eventually wears out.

As a countermeasure to this problem, measures have been taken to reduce the surface pressure applied to the center pin groove by increasing the diameter of the center pin or increasing the depth of engagement between the center pin and the center pin groove. Due to structural constraints, some of the products were difficult to deal with, and there were also problems for which complete countermeasures could not be taken.

An object of the present invention is to provide a support device that prevents wear of a center pin groove and improves turbine safety.

[Means to solve the problem]

The above object is achieved by fitting a spacer with an adjusted thickness into the gap between the back surface of the support bar and the back surface of the support bar groove provided in the vehicle compartment, thereby substantially eliminating the gap.

[Effect]

By fitting a spacer into the gap between the back of the support bar and the back of the support bar groove provided in the passenger compartment, and eliminating the gap between the diaphragm and the passenger compartment, the conventional function of the support device is improved. In addition to adjusting the downward axis, it is possible to restrain the diaphragm from moving to the left or right inside the vehicle interior. In this case, by adjusting the thickness of the left and right spacers, it is also possible to adjust the axes in the left and right directions. Therefore, in addition to the conventional technology where the diaphragm tries to move left and right due to vibrations and steam force during turbine operation, which is supported only by the center pin, the support device can also share the force, which reduces center pin stress. This can reduce wear on the center pin groove.

【Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is an overall view of a support device for setting a diaphragm in a vehicle compartment, and FIG. 2 is a detailed view of the support device.

A support bar 4 is attached to a support bar groove 3 provided near the horizontal surface of the lower half diaphragm 2 by bolts 5 so as to protrude from the outer diameter of the diaphragm.

By setting the protruding part 9 of the support bar 4 on the shim 8 which is fixed and attached to the bottom of the support bar groove 7 provided in the lower half compartment 6, the lower half diaphragm 2 is fixed to the lower half compartment 6. is set to

A spacer 13 is fitted into a gap 12 between the support bar rear surface 10 and a support bar groove rear surface 11 provided in the lower half compartment, and the lower half diaphragm 2 is moved within the range of the gap 14 between the lower half compartment 6 and the lower half compartment 6. prevents you from doing so.

According to the present invention, even if an acting force that presses the lower half diaphragm in one direction is generated due to vibration or steam force during operation of the turbine, in addition to being supported by the fitting between the center pin 16 and the center pin groove 17, Since even a part of the support bar can support this acting force, the contact area of the part that opposes the acting force is greatly increased, and the surface pressure for one acting force is reduced, which solves the problems of the conventional technology. It is possible to prevent the center pin groove from being worn out.

FIG. 3 shows a state in which an arcuate spring 15 is inserted in place of the spacer 13 shown in FIG.

The present invention has a structure particularly suitable for areas with high temperatures.

That is, even when the lower half diaphragm expands due to steam temperature, the deflection of the spring 15 absorbs the tension between the lower half casing and the lower half diaphragm, thereby preventing damage to each other.

〔Effect of the invention〕

According to the present invention, compared to the case where the center pin groove is conventionally held only by the center pin, the acting force on the center pin groove can be reduced and damage to the center pin groove can be prevented, which is effective in improving the safety of the turbine.

[Brief explanation of the drawing]

FIG. 1 is an overall view of a support device according to an embodiment of the present invention, FIG. 2 is a sectional view of the support device shown in FIG. 1, FIG. 3 is a sectional view of an application example of FIG. FIG. 5 is a detailed view of the center support device. 1...Rotor, 2...Lower half diaphragm, 4...
Support bar, 6...lower compartment, 12...gap, 1
3...Spacer, 14...Gap, 15...Spring. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. In a pair of diaphragm support devices attached to a lower half diaphragm having a center support device for a steam turbine diaphragm divided into upper and lower halves, the back surface of the support bar and the opposing casing A support device for a steam turbine diaphragm, characterized in that a spacer is inserted and filled in a gap between the support groove and the back surface of the diaphragm to prevent the diaphragm from moving leftward or rightward in the casing. 2. A steam turbine diaphragm support device according to claim 1, wherein the spacer is an arcuate spring.