A vertical key positioning structure for a marine steam turbine

Abstract

A vertical key positioning structure for a marine steam turbine relates to the technical field of steam turbines. The invention aims to solve the problem that due to the relatively compact structure of marine steam turbines and the small internal operating space, the bottom key installation and positioning structure of the traditional steam turbine cannot be applied to marine steam turbines, thereby causing the marine steam turbine to be unable to operate normally in a harsh marine environment. In view of the characteristics of marine steam turbines, such as compact structure, insufficient operating space, and heel and pitch in the operating environment, the present invention adopts a positioning method to install vertical keys of a new structure on both the upper and lower halves of the partition sleeve, so that they meet the operating environment and are stably installed; and the vertical keys do not need to be welded to the cylinder, but are fixed to the bottom and top of the partition sleeve using two mutually perpendicular positioning pins, so that they are circumferentially positioned with the cylinder and realize the guiding effect of the axial expansion of the partition sleeve, thereby ensuring the circumferential position relationship between the partition and the partition sleeve and the cylinder. The present invention is applicable to the field of marine steam turbines.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a vertical key positioning structure of a marine steam turbine. Background Art

[0002] For common steam turbine structures, the assembly process of its rotor, partition and partition sleeve is generally as follows: the upper and lower partitions are respectively assembled and centered with the partition sleeve or the upper and lower cylinders through brackets or ear blocks, and the axial direction is positioned by axial locating pins, and the circumferential direction is positioned by bottom keys. The bottom key is usually repaired and spot welded first, and then the corresponding lower partition sleeve is removed and further welded. After the centering is completed, the upper and lower cylinders are tightened.

[0003] Compared to conventional power plant turbines, marine steam turbines currently face stricter requirements for lightweighting and compactness. Furthermore, marine equipment requires heel and pitch testing to ensure proper operation in the harsh marine environment. This necessitates designing marine steam turbines as compactly as possible, while ensuring component stability and preventing uncontrolled movement or rotation. To meet these demands, the continuous drive for compact turbine structures has resulted in the common bottom key mounting and positioning mechanism becoming unusable due to insufficient installation space.

[0004] In summary, due to the relatively compact structure and small internal operating space of marine steam turbines, the bottom key installation and positioning structure of traditional steam turbines cannot be applied to marine steam turbines, resulting in the problem that marine steam turbines cannot operate normally in harsh marine environments. Summary of the Invention

[0005] The present invention proposes a vertical key positioning structure for a marine steam turbine to solve the problem that the traditional bottom key installation and positioning structure of a steam turbine cannot be applied to a marine steam turbine due to the relatively compact structure and small internal operating space of the marine steam turbine, thereby causing the marine steam turbine to be unable to operate normally in a harsh marine environment.

[0006] The vertical key positioning structure of a marine steam turbine of the present invention comprises an upper diaphragm sleeve 1, a first transverse positioning pin 2, a first vertical key 3, a first longitudinal positioning pin 4, an upper cylinder 5, a lower diaphragm sleeve 6, a second vertical key 7, a lower cylinder 8, a second transverse positioning pin 9, and a second longitudinal positioning pin 10;

[0007] The lower baffle cover 6 is arranged inside the lower cylinder 8. A second vertical key 7 is provided between the raised right end surface of the outer surface of the lower baffle cover 6 and the right inner wall of the positioning groove of the lower cylinder 8. The cross section of the second vertical key 7 is L-shaped. The raised right end surface of the lower baffle cover 6 is fixedly connected to the vertical section of the second vertical key 7 by a second horizontal positioning pin 9. The outer surface of the lower baffle cover 6 is fixedly connected to the horizontal section of the second vertical key 7 by a second longitudinal positioning pin 10.

[0008] The upper baffle cover 1 is arranged inside the upper cylinder 5, and a first vertical key 3 is provided between the raised right end surface of the outer surface of the upper baffle cover 1 and the right inner wall of the positioning groove of the upper cylinder 5, and the cross-section of the first vertical key 3 is L-shaped. The raised right end surface of the upper baffle cover 1 is fixedly connected to the vertical section of the first vertical key 3 by a first horizontal positioning pin 2, and the outer surface of the upper baffle cover 1 is fixedly connected to the horizontal section of the first vertical key 3 by a first longitudinal positioning pin 4;

[0009] Furthermore, the outer surface of the second horizontal positioning pin 9 is welded and fixed to the inner surface of the positioning hole on the vertical section of the second vertical key 7;

[0010] Furthermore, the outer surface of the second longitudinal positioning pin 10 is welded and fixed to the inner surface of the positioning hole on the horizontal section of the second vertical key 7;

[0011] Furthermore, the outer surface of the No. 1 horizontal positioning pin 2 is welded and fixed to the inner surface of the positioning hole on the vertical section of the No. 1 vertical key 3;

[0012] Furthermore, the outer surface of the No. 1 longitudinal positioning pin 4 is welded and fixed to the inner surface of the positioning hole on the horizontal section of the No. 1 vertical key 3;

[0013] Furthermore, the upper baffle sleeve 1, the upper cylinder 5, the lower baffle sleeve 6 and the lower cylinder 8 are coaxially arranged;

[0014] Furthermore, during installation, the lower partition sleeve 6 is first installed inside the lower cylinder 8, and the middle dividing surface of the lower partition sleeve 6 adopts a cat's claw structure to fall inside the lower cylinder 8. After centering and positioning, the hydrophobic hole on the bottom surface of the lower cylinder 8 itself is expanded to a suitable size as an operating hole, and the repaired No. 2 vertical key 7 is installed in the corresponding groove of the lower cylinder 8, and the No. 2 horizontal locating pin 9 and the No. 2 longitudinal locating pin 10 of the lower half are successively driven into the pin holes and spot welded; then the upper partition sleeve 1 is dropped on the upper part of the lower partition sleeve 6, and the middle dividing surface bolts are tightened; then the upper cylinder 5 falls, and the steam duct hole on the top surface of the upper cylinder 5 is used as the operating area, and the repaired No. 1 vertical key 3 is installed in the corresponding groove of the upper cylinder 5, and the No. 1 horizontal locating pin 2 and the No. 1 longitudinal locating pin 4 of the upper half are successively driven in and spot welded, thereby completing the installation of the turbine vertical key positioning structure.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention overcomes the shortcomings of the prior art. In view of the characteristics of marine steam turbines, such as compact structure, insufficient operating space, and heel and pitch in the operating environment, the present invention adopts a positioning method, and installs vertical keys of a new structure on the upper and lower halves of the partition sleeve, and uses the existing structure for modification so that it can be installed in a small space and meet the operating environment, and the installation is stable; and the vertical keys do not need to be welded to the cylinder, but are fixed to the bottom and top of the partition sleeve by two mutually perpendicular positioning pins, so that they are circumferentially positioned with the cylinder and realize the guiding effect of the axial expansion of the partition sleeve, thereby ensuring the circumferential position relationship between the partition and the partition sleeve and the cylinder, passing the heel and pitch test of the marine steam turbine, ensuring the normal operation of the marine steam turbine in the harsh marine environment, and improving the stability of the marine steam turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a main sectional view of a vertical key positioning structure for a marine steam turbine according to the present invention;

[0018] Figure 2 yes Figure 1 A partially enlarged schematic diagram of the vertical key positioning structure of a marine steam turbine described in the present invention at view C. DETAILED DESCRIPTION

[0019] Specific implementation method 1: Combination Figure 1 and Figure 2 This embodiment describes a vertical key positioning structure for a marine steam turbine, which comprises an upper diaphragm sleeve 1, a first transverse positioning pin 2, a first vertical key 3, a first longitudinal positioning pin 4, an upper cylinder 5, a lower diaphragm sleeve 6, a second vertical key 7, a lower cylinder 8, a second transverse positioning pin 9, and a second longitudinal positioning pin 10.

[0020] The lower baffle cover 6 is arranged inside the lower cylinder 8. A second vertical key 7 is provided between the raised right end surface of the outer surface of the lower baffle cover 6 and the right inner wall of the positioning groove of the lower cylinder 8. The cross section of the second vertical key 7 is L-shaped. The raised right end surface of the lower baffle cover 6 is fixedly connected to the vertical section of the second vertical key 7 by a second horizontal positioning pin 9. The outer surface of the lower baffle cover 6 is fixedly connected to the horizontal section of the second vertical key 7 by a second longitudinal positioning pin 10.

[0021] The upper baffle cover 1 is arranged inside the upper cylinder 5, and a first vertical key 3 is provided between the raised right end surface of the outer surface of the upper baffle cover 1 and the right inner wall of the positioning groove of the upper cylinder 5, and the cross-section of the first vertical key 3 is L-shaped. The raised right end surface of the upper baffle cover 1 is fixedly connected to the vertical section of the first vertical key 3 by a first horizontal positioning pin 2, and the outer surface of the upper baffle cover 1 is fixedly connected to the horizontal section of the first vertical key 3 by a first longitudinal positioning pin 4;

[0022] In this specific embodiment, during installation, the lower partition sleeve 6 is first installed inside the lower cylinder 8, and the middle dividing surface of the lower partition sleeve 6 adopts a cat's claw structure to fall inside the lower cylinder 8. After centering and positioning, the hydrophobic hole on the bottom surface of the lower cylinder 8 itself is expanded to a suitable size as an operating hole, and the repaired No. 2 vertical key 7 is installed in the corresponding groove of the lower cylinder 8, and the No. 2 horizontal locating pin 9 and the No. 2 longitudinal locating pin 10 of the lower half are successively driven into the pin holes and spot welded; then the upper partition sleeve 1 is dropped on the upper part of the lower partition sleeve 6, and the middle dividing surface bolts are tightened; then the upper cylinder 5 is dropped, and the steam duct hole on the top surface of the upper cylinder 5 is used as the operating area, and the repaired No. 1 vertical key 3 is installed in the corresponding groove of the upper cylinder 5, and the No. 1 horizontal locating pin 2 and the No. 1 longitudinal locating pin 4 of the upper half are successively driven in and spot welded, thereby completing the installation of the turbine vertical key positioning structure.

[0023] Specific implementation method 2: Combination Figure 1 and Figure 2 To explain this embodiment, this embodiment is a further limitation of the positioning structure described in the specific embodiment 1. This embodiment describes a vertical key positioning structure for a marine steam turbine, in which the outer surface of the No. 2 horizontal positioning pin 9 is welded and fixed to the inner surface of the positioning hole on the vertical section of the No. 2 vertical key 7.

[0024] Specific implementation method three: Combination Figure 1 and Figure 2 To explain this embodiment, this embodiment is a further limitation of the positioning structure described in the second specific embodiment. This embodiment describes a vertical key positioning structure for a marine steam turbine, in which the outer surface of the No. 2 longitudinal positioning pin 10 is welded and fixed to the inner surface of the positioning hole on the horizontal section of the No. 2 vertical key 7.

[0025] Specific implementation method four: Combination Figure 1 and Figure 2 To explain this embodiment, this embodiment is a further limitation of the positioning structure described in the specific embodiment 1. This embodiment describes a vertical key positioning structure for a marine steam turbine, in which the outer surface of the No. 1 horizontal positioning pin 2 is welded and fixed to the inner surface of the positioning hole on the vertical section of the No. 1 vertical key 3.

[0026] Specific implementation method five: Combination Figure 1and Figure 2 To explain this embodiment, this embodiment is a further limitation of the positioning structure described in the specific embodiment four. This embodiment describes a vertical key positioning structure for a marine steam turbine, in which the outer surface of the No. 1 longitudinal positioning pin 4 is welded and fixed to the inner surface of the positioning hole on the horizontal section of the No. 1 vertical key 3.

[0027] Specific implementation method six: combination Figure 1 and Figure 2 This embodiment is described as a further limitation of the positioning structure described in the first embodiment. This embodiment describes a vertical key positioning structure for a marine steam turbine, wherein the upper partition sleeve 1, the upper cylinder 5, the lower partition sleeve 6 and the lower cylinder 8 are coaxially arranged.

[0028] How it works

[0029] During installation, first install the lower partition sleeve 6 inside the lower cylinder 8, and the middle dividing surface of the lower partition sleeve 6 adopts a cat's claw structure to fall inside the lower cylinder 8. After centering and positioning, expand the hydrophobic hole on the bottom surface of the lower cylinder 8 to an appropriate size as an operating hole, and install the repaired No. 2 vertical key 7 into the corresponding groove of the lower cylinder 8, and successively drive the No. 2 horizontal locating pin 9 and the No. 2 longitudinal locating pin 10 of the lower half into the pin hole and spot weld it; then drop the upper partition sleeve 1 on the upper part of the lower partition sleeve 6, and tighten the middle dividing surface bolt; then the upper cylinder 5 falls, and the steam duct hole on the top surface of the upper cylinder 5 is used as the operating area, and the repaired No. 1 vertical key 3 is installed into the corresponding groove of the upper cylinder 5, and successively drive the No. 1 horizontal locating pin 2 and the No. 1 longitudinal locating pin 4 of the upper half into and spot weld it, thus completing the installation of the turbine vertical key positioning structure.

Claims

1. A vertical key positioning structure for a marine steam turbine, characterized in that: It comprises an upper baffle cover (1), a first transverse positioning pin (2), a first vertical key (3), a first longitudinal positioning pin (4), an upper cylinder (5), a lower baffle cover (6), a second vertical key (7), a lower cylinder (8), a second transverse positioning pin (9) and a second longitudinal positioning pin (10); The lower half partition cover (6) is arranged inside the lower half cylinder (8), and a second vertical key (7) is provided between the raised right end face of the outer surface of the lower half partition cover (6) and the right inner wall of the positioning groove of the lower half cylinder (8), and the cross section of the second vertical key (7) is L-shaped. The raised right end face of the lower half partition cover (6) is fixedly connected to the vertical section of the second vertical key (7) through the second horizontal positioning pin (9), and the outer surface of the lower half partition cover (6) is fixedly connected to the horizontal section of the second vertical key (7) through the second longitudinal positioning pin (10); The upper baffle sleeve (1) is arranged inside the upper cylinder (5), and a first vertical key (3) is provided between the raised right end face of the outer surface of the upper baffle sleeve (1) and the right inner wall of the positioning groove of the upper cylinder (5), and the cross section of the first vertical key (3) is L-shaped. The raised right end face of the upper baffle sleeve (1) is fixedly connected to the vertical section of the first vertical key (3) through a first horizontal positioning pin (2), and the outer surface of the upper baffle sleeve (1) is fixedly connected to the horizontal section of the first vertical key (3) through a first longitudinal positioning pin (4).

2. The vertical key positioning structure of a marine steam turbine according to claim 1, characterized in that: The outer surface of the second horizontal positioning pin (9) is welded and fixed to the inner surface of the positioning hole on the vertical section of the second vertical key (7).

3. The vertical key positioning structure of a marine steam turbine according to claim 2, characterized in that: The outer surface of the second longitudinal positioning pin (10) is welded and fixed to the inner surface of the positioning hole on the horizontal section of the second vertical key (7).

4. The vertical key positioning structure for a marine steam turbine according to claim 1, characterized in that: The outer surface of the No. 1 horizontal positioning pin (2) is welded and fixed to the inner surface of the positioning hole on the vertical section of the No. 1 vertical key (3).

5. The vertical key positioning structure of a marine steam turbine according to claim 4, characterized in that: The outer surface of the No. 1 longitudinal positioning pin (4) is welded and fixed to the inner surface of the positioning hole on the horizontal section of the No. 1 vertical key (3).

6. The vertical key positioning structure for a marine steam turbine according to claim 1, characterized in that: The upper baffle sleeve (1), the upper cylinder (5), the lower baffle sleeve (6) and the lower cylinder (8) are coaxially arranged.

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