Vertical key positioning structure of marine steam turbine

Abstract

A vertical key positioning structure of a marine steam turbine relates to the technical field of steam turbines. In order to solve the problem that a bottom key mounting and positioning structure in a traditional steam turbine cannot be applied to the marine steam turbine due to the fact that the marine steam turbine is compact in structure and small in internal operation space, the marine steam turbine cannot normally operate in a severe marine environment. Aiming at the characteristics that the marine steam turbine is compact in structure, insufficient in operation space and transverse and longitudinal in operation environment, a positioning mode is adopted, vertical keys of novel structures are installed on the upper half and the lower half of a partition plate sleeve, the operation environment is met, and installation is stable; the vertical key does not need to be welded on the cylinder, the vertical key is fixed at the bottom and the top of the partition plate sleeve through the two positioning pins which are perpendicular to each other, the vertical key and the cylinder are circumferentially positioned, the guide function of axial expansion of the partition plate sleeve is achieved, and therefore the circumferential position relation of the partition plate, the partition plate sleeve and the cylinder is ensured. The invention is applicable to the field of marine 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 first repaired and spot welded, 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] At present, compared with general power station steam turbines, marine steam turbines have stricter requirements on lightweight and compact structure. Secondly, marine equipment needs to be tested for heel and pitch to ensure that marine steam turbines can operate normally in harsh marine environments. This requires that the design of marine steam turbines should be as compact as possible while ensuring the stability of components and preventing uncontrolled movement and rotation. In order to meet the needs of marine steam turbines, the commonly used bottom key installation positioning structure cannot be used due to insufficient installation space when the steam turbine structure is continuously compacted.

[0004] In summary, due to the compact structure of the marine steam turbine and the small internal operating space, the bottom key installation and positioning structure of the traditional steam turbine cannot be applied to the marine steam turbine, resulting in the problem that the marine steam turbine cannot operate normally in the harsh marine environment. 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 bottom key installation positioning structure of a traditional steam turbine cannot be applied to the marine steam turbine due to the relatively compact structure of the marine steam turbine and the small internal operating space, thereby causing the marine steam turbine to be unable to operate normally in a harsh marine environment.

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

[0007] The lower half partition cover 6 is arranged inside the lower half cylinder 8, and a second vertical key 7 is arranged 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, and 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;

[0008] The upper baffle sleeve 1 is arranged inside the upper cylinder 5, and a first vertical key 3 is arranged 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, and the raised right end face of the upper baffle sleeve 1 is fixedly connected with 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 with the horizontal section of the first vertical key 3 through 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, first install the lower partition sleeve 6 inside the lower cylinder 8, and the middle dividing surface of the lower partition sleeve 6 falls inside the lower cylinder 8 using a cat's claw structure. After centering and positioning, expand the hydrophobic hole on the bottom surface of the lower cylinder 8 to a suitable size as an operating hole, 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 bolts; then drop the upper cylinder 5, use the steam duct hole on the top surface of the upper cylinder 5 as the operating area, install the repaired No. 1 vertical key 3 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, and the installation of the vertical key positioning structure of the steam turbine is completed.

[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 compact structure, insufficient operating space and heel and pitch in the operating environment of the marine steam turbine, the present invention adopts a positioning method to install vertical keys of a new structure on the upper and lower halves of the partition sleeve, and transforms the existing structure 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 the guiding effect of the axial expansion of the partition sleeve is achieved, 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 It is a main cross-sectional view of a vertical key positioning structure of a marine steam turbine according to the present invention;

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

[0019] Specific implementation method 1: Combination Figure 1 and Figure 2 The present embodiment is described. The vertical key positioning structure of a marine steam turbine described in the present embodiment comprises an upper bulkhead 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 bulkhead 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 half partition cover 6 is arranged inside the lower half cylinder 8, and a second vertical key 7 is arranged 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, and 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;

[0021] The upper baffle sleeve 1 is arranged inside the upper cylinder 5, and a first vertical key 3 is arranged 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, and the raised right end face of the upper baffle sleeve 1 is fixedly connected with 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 with the horizontal section of the first vertical key 3 through a first longitudinal positioning pin 4;

[0022] According to the present 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 falls inside the lower cylinder 8 using a cat's claw structure. 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 to fix; 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 into and spot welded to fix, thereby completing the installation of the vertical key positioning structure of the steam turbine.

[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, wherein 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, wherein 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 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 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, 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 a suitable size as an operating hole, 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 bolts; 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 are driven in and spot welded to complete the installation of the vertical key positioning structure of the steam turbine.

Claims

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