CN214787569U - Static holding ring anti-jamming device for steam turbine - Google Patents

Abstract

The utility model discloses a static retaining ring anti-jamming device of a steam turbine, which comprises a static retaining ring body, wherein a gap is arranged between a non-sealing surface of an outer ring of the static retaining ring body and a cylinder limiting clamping groove, a convex point is arranged on the non-sealing surface of the static retaining ring body, and the convex point is contacted with the cylinder limiting clamping groove; the thickness of the salient point is consistent with that of the gap. The utility model discloses a be provided with the clearance between the non-sealing face of static ring body outer loop and the spacing draw-in groove of cylinder to through bump and the spacing draw-in groove point contact of cylinder together, greatly lead reduced frictional force, if there is the bite phenomenon, take slight vibration's mode, just can open, greatly reduced the risk of bite.

Description

Static holding ring anti-jamming device for steam turbine

The technical field is as follows:

the utility model relates to a static ring appurtenance that holds convenient to steam turbine operation, maintenance, in particular to static ring anti-sticking puckery device that holds of steam turbine.

Background art:

the static part in the cylinder body of the steam turbine is divided into a steam seal sleeve, a clapboard sleeve and a static blade retaining ring, which are called static retaining rings for short; the static holding ring is fixed in a mode that a concave-convex groove is adopted to limit the axial position in the cylinder, and a suspension loop is adopted to adjust the dynamic and static centers; the upper half and the lower half of the static holding ring are connected and fixed by bolts; because the gap between the stationary holding ring and the cylinder limiting clamping groove is only within 2mm, in the operation process of the steam turbine, steam directly blows through the gap, is subjected to cold and thermal deformation, contains a certain amount of sodium magnesium ions in the steam, is commonly called as steam impurities, and the impurities can be adsorbed at any position in the cylinder to form scale, so that the gap between the stationary holding ring and the cylinder limiting clamping groove disappears, and is corroded and jammed; when the steam turbine is overhauled in the later period, the upper cylinder cover needs to be uncovered, at the moment, the upper cylinder cannot be normally hung due to the fact that the static holding ring is clamped with the cylinder and the influence of the upper half bolt and the lower half bolt of the static holding ring is caused, and even the rotor of the steam turbine is bent; therefore, in the design of medium and low pressure turbines, a static retaining ring joint surface bolt is cancelled by various steam turbine manufacturers, and an upper partition plate, a lower partition plate and a gas seal sleeve are freely combined and sealed by means of gravity. The mode can cause the defect that the gap leakage exists in the split surfaces of the shaft sleeve and the gas sleeve due to the fact that the upper partition plate is jammed in the operation process of the steam turbine, and therefore the operation efficiency of a unit is reduced, and even the equipment damage caused by scouring of the joint surface occurs.

The utility model has the following contents:

the utility model discloses the technical problem that will solve is: overcome prior art's not enough, provide a static retaining ring anti-sticking puckery device of steam turbine, change into the point contact by original face contact, reduced the appearance of the puckery condition of sticking, the safe operation in the later stage of being convenient for and the smooth development of maintenance work.

The utility model discloses a technical scheme who solves technical problem and take is:

the static holding ring anti-jamming device of the steam turbine comprises a static holding ring, wherein an axial gap is formed in a non-sealing surface of a clamping groove of the static holding ring, a convex point is arranged on the non-sealing surface, and the convex point is matched with a limiting clamping groove of a cylinder to ensure the axial gap between the convex point and the limiting clamping groove.

The thickness of the axial gap is 1-2mm, and the thickness of the axial gap is consistent with that of the salient point.

The salient points are at least six and evenly surround the non-sealing surface of the outer ring of the static ring body.

The static holding ring is a baffle sleeve or an air sealing sleeve.

The utility model discloses an actively beneficial effect is:

1. the utility model discloses a static non-sealing face of holding ring body outer loop is provided with the clearance with the spacing draw-in groove of cylinder between to through bump and the spacing draw-in groove point contact of cylinder together, greatly lead reduced frictional force, if there is the bite phenomenon, take slight vibration's mode, just can open, greatly reduced the risk of bite.

2. The utility model discloses the thickness of bump is unanimous with the thickness that the non-sealing face reserved the turning clearance, has both kept the clearance of convex groove between original quiet leaf holding ring and the spacing draw-in groove of cylinder, has reduced the risk of bite again, convenient to use, easy operation easily promotes.

3. The utility model discloses a structure also can be used for balanced piston atmoseal department, adopts same scheme, also can reduce the risk of jam.

Description of the drawings:

fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the air seal of the balance piston according to the present invention.

In the figure, 1-stationary blade carrier ring, 2-non-sealing surface of stationary blade carrier ring, and 3-salient point.

The specific implementation mode is as follows:

the invention will be further explained and explained with reference to the drawings, in which:

example (b):

referring to fig. 1, the static holding ring anti-jamming device of the steam turbine comprises a static holding ring 1, wherein an axial gap is formed in a non-sealing surface 2 of a clamping groove of the static holding ring 1, a salient point 3 is arranged on the non-sealing surface 2, and the salient point 3 is matched with a cylinder limiting clamping groove to ensure the axial gap between the two.

The thickness of the axial gap is 1-2mm, and the thickness of the axial gap is consistent with that of the salient point 3.

The salient points 3 are at least six and evenly surround the non-sealing surface 2 of the outer ring of the static ring body 1; therefore, the contact area between the stationary retaining ring clamping groove and the cylinder limiting clamping shoulder is reduced, and the clamping of the stationary retaining ring clamping groove and the cylinder limiting clamping shoulder caused by high-temperature deformation, cavitation scaling and other factors is prevented.

The static holding ring 1 is a separator sleeve or an air seal sleeve, fig. 1 is a structural schematic diagram of the separator sleeve, fig. 2 is a structural schematic diagram of the air seal sleeve, wherein 3 in fig. 2 is indicated as the position of a convex point, the construction process of the air seal sleeve or the separator sleeve is the same, the thickness of 1-2mm is firstly cut, and then the convex point 3 is matched with a cylinder limiting clamping groove to ensure the axial gap between the two.

In actual operation, 1-2mm of thickness is uniformly cut on the non-sealing surface of the static holding ring, so that 1-2mm of thickness exists between the non-sealing surface of the static holding ring and the cylinder limiting clamping groove, then, salient points are welded on the non-sealing surface of the static holding ring, the thickness of the salient points is consistent with the cut thickness, the surface contact between the static holding ring and the cylinder limiting clamping groove is changed into point contact, if the clamping situation occurs, a slight vibration mode is adopted, the friction force is greatly reduced, and the later-stage maintenance work is facilitated to be carried out smoothly.

The utility model discloses a be provided with the clearance between the non-sealing face of static ring body outer loop and the spacing draw-in groove of cylinder to through bump and the spacing draw-in groove point contact of cylinder together, greatly reduced both frictional force, if there is the bite phenomenon, take slight vibration's mode, just can open, greatly reduced the risk of bite.

The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims (4)

1. The utility model provides a static anti-sticking puckery device that holds of steam turbine, holds ring (1) including static, its characterized in that: an axial gap is formed in a non-sealing surface (2) of the clamping groove of the static holding ring (1), a salient point (3) is arranged on the non-sealing surface (2), and the salient point (3) is matched with a cylinder limiting clamping groove to ensure the axial gap between the two.

2. The turbine stationary retaining ring anti-seizing device according to claim 1, wherein: the thickness of the axial gap is 1-2mm, and the thickness of the axial gap is consistent with that of the salient points (3).

3. The turbine stationary retaining ring anti-seizing device according to claim 1, wherein: the salient points (3) are at least six and evenly surround the non-sealing surface (2) of the outer ring of the static ring body (1).

4. The turbine stationary retaining ring anti-seizing device according to claim 1, wherein: the static holding ring (1) is a clapboard sleeve or an air sealing sleeve.

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