CN219826937U - Foreign matter-preventing cover plate for overhauling steam turbine - Google Patents

Abstract

The utility model discloses a steam turbine overhauling foreign matter preventing cover plate, which comprises a cylinder cover plate (2), wherein the cylinder cover plate (2) is made of aluminum alloy, the shape outline of the cylinder cover plate (2) is matched with a hole of a middle division surface of a cylinder for being directly placed on the middle division surface of the cylinder and sealing the hole of the middle division surface of the cylinder, at least one openable access door (20) is arranged on the cylinder cover plate (2), the cylinder cover plate (2) is formed by splicing a plurality of large plates, each large plate consists of a pattern plate and reinforcing ribs (200), and the pattern plate and the reinforcing ribs (200) are fixed through welding; the utility model has high installation speed, no risk of foreign matters falling into the cylinder surface, and almost no abrasion to the cylinder surface of the split surface in a soft contact mode.

Description

Foreign matter-preventing cover plate for overhauling steam turbine

Technical Field

The utility model relates to the field of turbine overhaul, in particular to a foreign matter preventing cover plate for turbine overhaul.

Background

The steam turbine cylinder is divided into an upper cylinder and a lower cylinder, taking a low-pressure cylinder as an example, and is divided into an upper low-pressure cylinder and a lower low-pressure cylinder, wherein the upper low-pressure cylinder and the lower low-pressure cylinder are assembled up and down, and a horizontal contact surface between the upper low-pressure cylinder and the lower low-pressure cylinder is a bisection surface. When overhauling, the upper cylinder needs to be uncovered, and after the upper cylinder is uncovered, the hole of the lower cylinder is large and deep, so that a cover plate which can bear load and can be quickly installed is required to cover the hole, thereby preventing foreign matters from falling into the cylinder and facilitating personnel to walk on the cylinder. The existing cover plate is basically formed by splicing a large number of smaller small plates, certain small plates need to be taken off when people get in and out, and support is needed to be provided for avoiding treading the bottoms of the small plates, so that the cover plate needs to be hoisted for many times, is complex in installation and is low in installation speed; the plate is fixed by the checkered plate and the frame through bolts, and foreign matters (bolts) fall into the plate.

Disclosure of Invention

The utility model aims to solve the technical problems that the installation speed is low and foreign matters (bolts) fall into risks in the prior art, and provides a cover plate for preventing the foreign matters from being overhauled by a steam turbine.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a structure turbine overhauls prevents foreign matter apron, includes the cylinder apron, the shape profile of cylinder apron and the entrance to a cave looks adaptation of the well division face of cylinder are used for directly shelving on the well division face of cylinder and closing cap cylinder well division face department's entrance to a cave, set up at least one openable access door on the cylinder apron, the cylinder apron is by the piece of plates together to form, every big piece of plate comprises checkered plate and strengthening rib, and checkered plate and strengthening rib pass through welded fastening.

Further, in the turbine overhauling foreign matter preventing cover plate disclosed by the utility model, the cylinder cover plate is concave, the large blocks comprise a long and narrow first side large block plate, a long and narrow middle large block plate and a long and narrow second side large block plate, the length direction of the middle large block plate is perpendicular to the length direction of the first side large block plate and the length direction of the second side large block plate, one long side of the first side large block plate and one long side of the second side large block plate are respectively adjacent to two wide sides of the middle large block plate, and one wide side of the first side large block plate and one wide side of the second side large block plate are flush with one long side of the middle large block plate.

Further, in the steam turbine overhauling foreign matter preventing cover plate, the front side of the checkered plate faces upwards for people to walk, and the back side of the checkered plate faces downwards and is provided with crisscrossed reinforcing ribs;

the pattern plates of the first side large block plate and the second side large block plate are far away from the side long edges of the middle large block plate, and the side edges of the pattern plates of the first side large block plate, the second side large block plate and the middle large block plate are all reserved with the reinforcing ribs to avoid positions, and the avoidance positions are used for being placed on the cylinder split surface and enabling the reinforcing ribs to be just located at the inner edges of holes to limit plane movement of the pattern plates.

Further, in the turbine maintenance foreign matter preventing cover plate of the present utility model, the middle massive plate is of a symmetrical structure, the symmetry plane is parallel to the width direction of the middle massive plate, and the first side massive plate and the second side massive plate are symmetrical with respect to the symmetry center of the middle massive plate.

Further, in the turbine service anti-foreign matter cover plate of the present utility model, the first side massive plate is provided with a pair of the access doors arranged along the length direction thereof, the second side massive plate is provided with a pair of the access doors arranged along the length direction thereof, and the access doors on the first side massive plate and the second side massive plate are symmetrical with respect to the symmetry center of the middle massive plate.

Furthermore, in the steam turbine overhauling foreign matter preventing cover plate, the cylinder cover plate is made of aluminum alloy, the checkered plates are aluminum alloy plates, and the reinforcing ribs are aluminum alloy tubular keels.

Further, in the turbine maintenance foreign matter preventing cover plate provided by the utility model, the turbine comprises an inner cylinder and an outer cylinder, the cylinder is the outer cylinder, and the turbine maintenance foreign matter preventing cover plate further comprises a cover plate, wherein the shape outline of the cover plate is matched with the hole at the middle division surface of the inner cylinder, and the cover plate is used for directly resting on the middle division surface of the inner cylinder and sealing the hole at the middle division surface of the inner cylinder.

The steam turbine overhauling foreign matter preventing cover plate has the following beneficial effects: the whole cylinder cover plate is formed by splicing a plurality of large plates, support is not needed to be provided at the bottom, stepping over can be avoided, lifting times can be reduced, and the installation is rapid; at least one openable access door is arranged on the cylinder cover plate, so that the overhaul is convenient; the checkered plates and the reinforcing ribs are fixed through welding, so that the risk of foreign matters falling into the plates is avoided; further, the avoidance position enables the reinforcing ribs to be just positioned at the inner edge of the hole, so that the plane movement of the checkered plate can be limited; the cylinder cover plate is made of all aluminum alloy materials and matched with criss-cross reinforcing ribs to improve strength, and the soft contact split cylinder surface mode has almost no abrasion to the split cylinder surface.

Drawings

For a clearer description of an embodiment of the utility model or of a technical solution in the prior art, the drawings that are needed in the description of the embodiment or of the prior art will be briefly described, it being obvious that the drawings in the description below are only embodiments of the utility model, and that other drawings can be obtained, without inventive effort, by a person skilled in the art from the drawings provided:

FIG. 1 is a top view of a low pressure cylinder;

FIG. 2 is a schematic view of the structure of the cover plate for preventing foreign matter in the maintenance of the steam turbine;

FIG. 3 is a schematic view of the present utility model in use for servicing a foreign object protection cover for a steam turbine.

Detailed Description

Aiming at the defects of low installation speed and risk of foreign matters (bolts) falling in the prior art, the utility model provides a cover plate for preventing the foreign matters from being overhauled by a steam turbine, which mainly comprises the following ideas: the shape outline of the cylinder cover plate is designed to be matched with the hole of the middle division surface of the cylinder for directly placing on the middle division surface of the cylinder and sealing the hole of the middle division surface of the cylinder, at least one openable access door is arranged on the cylinder cover plate, the cylinder cover plate is formed by splicing a plurality of large plates, each large plate consists of a pattern plate and a reinforcing rib, and the pattern plate and the reinforcing rib are fixed through welding; because the whole cylinder cover plate is formed by splicing a plurality of large plates, the bottom is not required to be provided with a support, the stepping over can be avoided, the hoisting frequency can be reduced, and the installation is rapid; when overhauling, an access door is opened, so that the overhauling is convenient; the checkered plates and the reinforcing ribs are fixed through welding, so that the risk of foreign matters falling into the plates is avoided; further, the avoidance position enables the reinforcing ribs to be just positioned at the inner edge of the hole, so that the plane movement of the checkered plate can be limited; the cylinder cover plate is made of all aluminum alloy materials and matched with criss-cross reinforcing ribs to improve strength, and the soft contact split cylinder surface mode has almost no abrasion to the split cylinder surface.

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Exemplary embodiments of the present utility model are illustrated in the accompanying drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the embodiments of the present utility model and the specific features in the embodiments are detailed descriptions of the technical solutions of the present utility model, and not limited to the technical solutions of the present utility model, and the embodiments of the present utility model and the technical features in the embodiments may be combined with each other without conflict.

Referring to FIGS. 1-3, taking the lower pressure cylinder of a steam turbine as an example, MP in FIG. 1 represents the bisecting plane of the lower pressure cylinder. The steam turbine overhauling foreign matter preventing cover plate comprises a cover plate 1 which is arranged in a coplanar manner and covers the lower low pressure cylinder inner cylinder and a cylinder cover plate 2 which is arranged on the lower low pressure cylinder outer cylinder. The cover plate 1 is a single complete aluminum alloy plate with a shape contour adapted to the opening at the middle split of the lower low pressure cylinder inner cylinder for directly resting on the middle split of the lower low pressure cylinder inner cylinder and closing the opening at the middle split of the lower low pressure cylinder inner cylinder, substantially in an arcuate shape. And the cylinder cover plate 2 is formed by splicing a plurality of independent large plates together. At least one openable access door 20 is provided on the cylinder cover 2. The shape contour of the cylinder cover plate 2 is matched with the hole of the middle division surface of the lower low-pressure cylinder outer cylinder for directly resting on the middle division surface of the lower low-pressure cylinder outer cylinder and sealing the hole of the middle division surface of the lower low-pressure cylinder outer cylinder.

It will be appreciated that the particular shape of the cover plate 1 and cylinder cover plate 2 is not strictly limited to that shown in figure 2, but is adapted to the opening to be blocked at the bisecting plane (a horizontal plane) of the inner and outer cylinders. The term "fit to the opening" refers to the fact that the shape contour is approximately the same as the shape contour of the opening to be blocked but the size is sufficiently larger than the size of the opening to be blocked, so that the cover plate can rest on the bisecting plane of the inner and outer cylinders, and thus, when the inner and outer cylinders are slightly different, the shapes of the cover plate 1 and the cylinder cover plate 2 can be correspondingly adjusted, which are simple variants of the present embodiment, and are all within the scope of the present utility model.

Specifically, the cylinder cover plate 2 is generally concave, and the plurality of large plates includes an elongated first side large plate 21, an elongated middle large plate 22, and an elongated second side large plate 23, i.e., the cylinder cover plate 2 is divided into three large blocks. The length direction of the middle massive plate 22 is perpendicular to the length direction of the first side massive plate 21 and the length direction of the second side massive plate 23, the middle massive plate 22 is of a symmetrical structure, the symmetrical plane is parallel to the width direction of the middle massive plate 22, and the first side massive plate 21 and the second side massive plate 23 are symmetrical about the symmetrical center of the middle massive plate 22. The long side of the first side large block plate 21 and the long side of the second side large block plate 23 are respectively adjacent to the wide sides of the middle large block plate 22, and the wide sides of the first side large block plate 21 and the second side large block plate 23 are flush with the long side of the middle large block plate 22.

As shown in fig. 2, the length direction of the middle massive plate 22 is the left-right direction, the length direction of the first side massive plate 21 and the second side massive plate 23 is the front-back direction, the middle massive plate 22 is self-symmetrical left-right, the first side massive plate 21 and the second side massive plate 23 are symmetrical left-right about the symmetrical center of the middle massive plate 22, the right long side of the first side massive plate 21 is close to the left wide side of the middle massive plate 22, the left long side of the second side massive plate 23 is close to the right wide side of the middle massive plate 22, the front long side of the first side massive plate 21 and the front long side of the second side massive plate 23 are flush with the front wide side of the middle massive plate 22, and the rear wide sides of the first side massive plate 21 and the second side massive plate 23 are arc-shaped sides. Because the opening of the low pressure cylinder is very large, when the whole cover plate of the outer cylinder is only three large blocks, the size of each large block is quite large, so that support is not needed to be provided at the bottom of the cover plate, and the problem of stepping over can be avoided, for example, when a user steps on the corner position of S in FIG. 2, the problem of stepping over can not occur.

Wherein, the first side massive plate 21 is provided with a pair of access doors 20 arranged along the length direction thereof, the second side massive plate 23 is provided with a pair of access doors 20 arranged along the length direction thereof, and the access doors 20 on the first side massive plate 21 and the second side massive plate 23 are symmetrical about the symmetry center of the middle massive plate 22. One side of the access door 20 is fixedly installed through a rotation shaft.

In this embodiment, each of the large plates (i.e., the first side large plate 21, the middle large plate 22, and the second side large plate 23) is composed of a patterned plate and a reinforcing rib 200, the front side of the patterned plate faces upwards for the people to walk, the back side of the patterned plate faces downwards and is provided with the reinforcing rib 200, and the reinforcing rib 200 is welded and fixed on the back side of the patterned plate in a criss-cross manner. The cylinder cover plate 2 is made of aluminum alloy, the checkered plates are aluminum alloy plates, and the reinforcing ribs 200 are aluminum alloy tubular keels. Referring to fig. 2, the middle massive plate 22 is fully paved with grid-shaped reinforcing ribs, including reinforcing ribs along the width direction of the middle massive plate 22 and reinforcing ribs along the length direction of the middle massive plate 22. The additional reinforcing ribs on the first side large block plate 21 and the second side large block plate 23 are mainly two reinforcing ribs extending along two long sides, and a group of reinforcing ribs arranged at intervals along the length direction and extending along the width direction.

In addition to the strength improvement, the reinforcing rib 200 of this embodiment also plays a limiting role, specifically, the long sides of the pattern plates of the first side bulk plate 21 and the second side bulk plate 23 (i.e. the left side of the first side bulk plate 21 and the right side of the second side bulk plate 23 in fig. 2) far away from the middle bulk plate, and the flush sides of the pattern plates of the first side bulk plate 21, the second side bulk plate 23 and the middle bulk plate 22 (i.e. the front sides of the three sides) are reserved with the reinforcing rib 200, and the avoiding positions are used for resting on the cylinder split surface and enabling the reinforcing rib 200 to be just located at the inner edge of the hole so as to limit the plane movement of the pattern plate.

In summary, the beneficial effects of the embodiment are as follows: only three large aluminum alloy checkered plates are used, parts are reduced, lifting times are reduced, installation is rapid, maintenance time is saved, efficiency is improved, the checkered plates and the reinforcing ribs are fixed through welding, the risk that foreign matters such as bolts fall into the plates is avoided, and foreign matter detection time is saved; the strength is improved by adopting the all-aluminum alloy material matched with criss-cross reinforcing ribs, the cylinder surface with the middle split surface is in soft contact, and no abrasion is caused; an openable access window is designed, so that personnel can conveniently enter and exit.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

The terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various constituent elements, but these constituent elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first component may be termed a second component, and, similarly, a second component may be termed a first component, without departing from the scope of the present utility model.

The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.

Claims (7)

1. The utility model provides a steam turbine overhauls prevents foreign matter apron, its characterized in that includes cylinder apron (2), the shape profile of cylinder apron (2) and the entrance to a cave looks adaptation of the well minute face of cylinder are used for directly shelving on the well minute face of cylinder and closing cap cylinder well minute face department's entrance to a cave, set up at least one access door (20) that can open on cylinder apron (2), cylinder apron (2) are by polylith massive board piece together and form, every massive board comprises checkered plate and strengthening rib (200), and checkered plate and strengthening rib (200) pass through welded fastening.

2. The steam turbine overhauling foreign matter preventing cover plate according to claim 1, wherein the cylinder cover plate (2) is in a concave shape, the plurality of large plates comprise a long and narrow first side large plate (21), a long and narrow middle large plate (22) and a long and narrow second side large plate (23), the length direction of the middle large plate (22) is perpendicular to the length direction of the first side large plate (21) and the length direction of the second side large plate (23), one side long edge of the first side large plate (21) and one side long edge of the second side large plate (23) are respectively adjacent to two side wide edges of the middle large plate (22), and one side wide edge of the first side large plate (21) and one side wide edge of the second side large plate (23) are flush with one side long edge of the middle large plate (22).

3. The turbine service anti-foreign matter cover plate of claim 2, wherein the front side of the checkered plate faces upwards for personnel to walk, and the back side of the checkered plate faces downwards and is provided with criss-cross reinforcing ribs (200);

the side long edges of the pattern plates of the first side large block plate (21) and the second side large block plate (23) far away from the middle large block plate and the side edges of the pattern plates of the first side large block plate (21), the second side large block plate (23) and the middle large block plate (22) are reserved between the reinforcing ribs (200) and keep away, and the keep away positions are used for being placed on a cylinder bisecting plane and enabling the reinforcing ribs (200) to be just located at the inner edges of holes so as to limit plane movement of the pattern plates.

4. The turbine service anti-foreign matter cover plate according to claim 2, characterized in that the intermediate bulk plate (22) is itself of a symmetrical structure and a symmetry plane is parallel to a width direction of the intermediate bulk plate (22), and the first side bulk plate (21) and the second side bulk plate (23) are symmetrical with respect to a symmetry center of the intermediate bulk plate (22).

5. The steam turbine service foreign matter prevention cover plate according to claim 4, wherein a pair of the access doors (20) arranged along a length direction thereof are provided on the first side block plate (21), a pair of the access doors (20) arranged along a length direction thereof are provided on the second side block plate (23), and the access doors (20) on the first side block plate (21) and the second side block plate (23) are symmetrical with respect to a center of symmetry of the intermediate block plate (22).

6. The steam turbine overhauling foreign matter preventing cover plate according to claim 1, wherein the cylinder cover plate (2) is made of aluminum alloy, the checkered plate is an aluminum alloy plate, and the reinforcing rib (200) is an aluminum alloy tubular keel.

7. The turbine service anti-alien cover plate according to claim 1, characterized in that the turbine comprises an inner and an outer cylinder, the cylinder being the outer cylinder, the turbine service anti-alien cover plate further comprising a cover plate (1) having a shape profile adapted to the opening at the bisecting plane of the inner cylinder for directly resting on the bisecting plane of the inner cylinder and for closing the opening at the bisecting plane of the inner cylinder.