A method for installing inner and outer stators of large steam turbine generator

Abstract

The invention discloses a method for threading inner and outer stators of a large steam turbine generator, and mainly relates to the technical field of steam turbine generator installation. The method comprises the following steps: S1, placing the outer stator in place; S2, arranging a slide plate at the inner bottom and left and right sides of the center of the outer stator; S3, installing a guide tool at the front end of the outer stator; S4, arranging an outer cushion block; S5, lifting the inner stator to the rear of the outer stator; S6, installing a traction tool at the lower part of the front end of the inner stator, installing an inner cushion block at the bottom of the inner stator, and installing a ball-limiting slider at the left and right sides of the center of the inner stator; S7, lifting the inner stator, and threading the front end of the inner stator into the outer stator; S8, lifting the inner stator upward, and hanging a traction steel wire rope on the traction tool via a guide tool bolt; S9, threading the inner stator to the installation position by using the traction steel wire rope; S10, removing each tool. The invention is safe and reliable, and is easy to implement on site, and can quickly and efficiently complete the threading of the inner and outer stators.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine generator installation, in particular to a method for threading inner and outer stators of a large steam turbine generator. Background Art

[0002] At present, the internal and external stators of large steam turbine generators in China are generally pulled by a winch and pulled into place by laying a slideway. For example, the invention patent named: A method for installing the internal and external stators of large generators (publication number: CN102364833A) often has the following problems when used:

[0003] 1) Due to the use of winch traction, the low-pressure cylinder of the steam turbine adjacent to the generator needs to be reserved before the inner and outer stators are installed, which affects the construction period;

[0004] 2) The concentricity of the inner and outer stators cannot be guaranteed during installation, which may easily cause collision between the inner and outer stators and damage the equipment. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to provide a safe, reliable and easy-to-implement method for threading the inner and outer stators of a large steam turbine generator, which can quickly and efficiently complete the threading of the inner and outer stators.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A method for installing inner and outer stators of a large steam turbine generator comprises the following steps:

[0008] S1. Put the outer stator in place;

[0009] S2. Arrange a slide plate at the inner bottom and left and right sides of the center of the outer stator;

[0010] S3. Install the guide fixture at the front end of the outer stator;

[0011] S4. Arrange an outer spacer at an appropriate position on the rear side of the outer stator;

[0012] S5. Use a hydraulic lifting device to lift the inner stator to the rear of the outer stator;

[0013] S6. Install the traction tooling at the lower part of the front end of the inner stator, install the inner pad at the bottom of the inner stator, and install a ball limit slider on the left and right sides of the center of the inner stator;

[0014] S7. Use a hydraulic lifting device to lift the inner stator, insert the front end of the inner stator into the outer stator, and place the inner stator on the inner pad and the outer pad;

[0015] S8, move the lifting point of the hydraulic lifting device to the rear end of the inner stator, lift the inner stator upward, and hang the traction wire rope on the traction fixture through the guide fixture bolt;

[0016] S9. Use the traction wire rope to thread the inner stator to the installation position;

[0017] S10. All tooling is removed and the installation of the inner and outer stators is completed.

[0018] Preferably, in step S2, the slide plate is arranged along the radial direction of the outer stator, and the slide plate is an arc-shaped plate.

[0019] Preferably, in step S6, the limit slider with balls comprises a limit slider for being mounted on the inner stator and a plurality of balls mounted on an end of the limit slider away from the inner stator.

[0020] Preferably, the height of the top surface of the inner pad in step S6 is higher than the height of the top surface of the outer pad in step S4, and the height to which the inner stator is lifted upward in step S8 is the difference between the height of the top surface of the inner pad and the height of the top surface of the outer pad.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The present invention can complete the installation of the inner and outer stators safely, reliably, quickly and efficiently without affecting the construction of the low-pressure cylinder, which is beneficial to saving construction period and cost; it can effectively ensure the safe distance between the inner and outer stators, ensure that no collision occurs during the installation process, and ensure the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of an implementation of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure between the inner and outer stators;

[0025] Figure 3 This is a schematic diagram of the lifting of the inner stator.

[0026] The numbers in the attached figure are: 1. outer stator; 2. slide plate; 3. guide fixture; 4. outer pad; 5. hydraulic lifting device; 6. inner stator; 7. traction fixture; 8. inner pad; 9. slider with ball limiter; 10. traction wire rope. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0028] Example: As shown in the attached Figure 1-3 As shown, the present invention is a method for installing inner and outer stators of a large steam turbine generator, comprising the steps of:

[0029] S1. After the external stator 1 arrives, put the external stator 1 in place;

[0030] S2, a slide plate 2 is arranged at the inner bottom and left and right sides of the center of the outer stator 1;

[0031] Preferably, the slide plate 2 is arranged along the radial direction of the outer stator 1 , and the slide plate 2 is an arc-shaped plate, and the outer side surface of the slide plate 2 is in close contact with the inner wall of the outer stator 1 .

[0032] S3. Install the guide fixture 3 at the front end of the outer stator 1; the guide fixture 3 includes a mounting frame installed at the front end of the outer stator 1, the mounting frame can be fixed to the outer stator 1 by screws, and the mounting frame is equipped with a steering pulley adapted to the traction wire rope 10, and the traction wire rope 10 is changed from a horizontal state to a vertical state through the steering pulley.

[0033] S4, arranging an outer spacer 4 at an appropriate position on the rear side of the outer stator 1;

[0034] S5. Use the hydraulic lifting device 5 to lift the inner stator 6 to the rear of the outer stator 1. The lifting point is as shown in the following figure. Figure 3 ;

[0035] S6. Install a traction tool 7 at the lower part of the front end of the inner stator 6. The traction tool 7 can be fixed to the front end of the inner stator 6 by screws. Install an inner pad 8 at the bottom of the inner stator 6. Install a ball-limiting slider 9 on both sides of the center of the inner stator 6. Figure 2 As shown; preferably, the ball bearing limit slider 9 includes a limit slider for installation on the inner stator and a plurality of balls installed at one end of the limit slider away from the inner stator. The inner pad 8 is used to provide support for the installation of the inner stator 6, and the ball bearing limit slider 9 and the slide plate 2 are used to provide guidance for the installation of the inner stator 6, which has a simple structure and strong operability.

[0036] S7, use the hydraulic lifting device 5 to lift the inner stator 6, and insert the front end of the inner stator 6 into the inner part of the outer stator 1, so that the inner stator 6 is positioned on the inner pad 8 and the outer pad 4;

[0037] S8, move the lifting point of the hydraulic lifting device 5 to the rear end of the inner stator 6, lift the inner stator 6 upward, lift the inner stator 6 to a distance of 20 mm from the top surface of the outer cushion block 4, and hang the traction wire rope 10 on the traction fixture 7 through the guide fixture 3;

[0038] Preferably, the height of the top surface of the inner pad 8 in step S6 is higher than the height of the top surface of the outer pad 4 in step S4, and the height to which the inner stator 6 is lifted upward in step S8 is the difference between the height of the top surface of the inner pad 8 and the height of the top surface of the outer pad 4, so that when the inner stator 6 is installed, the axis line of the inner stator 6 always coincides with the axis line of the outer stator 1.

[0039] S9, use the traction wire rope 10 to pass the inner stator 6 to the installation position;

[0040] S10, dismantle all the tooling (slide plate 2, guide tooling 3, outer pad 4, hydraulic lifting device 5, inner stator 6, traction tooling 7, inner pad 8, ball bearing limit slider 9, traction wire rope 10), and complete the installation of inner and outer stators.

[0041] The present invention does not affect the construction of the low-pressure cylinder, is conducive to saving construction period and cost, and can effectively ensure the safe distance between the inner and outer stators, ensure that no collision occurs during the installation process, and ensure the safety of the equipment.

Claims

1. A method for installing inner and outer stators of a large steam turbine generator, characterized in that: Includes steps: S1. Put the outer stator in place; S2. Arrange a slide plate at the inner bottom and left and right sides of the center of the outer stator; S3. Install the guide fixture at the front end of the outer stator; S4. Arrange an outer spacer at an appropriate position on the rear side of the outer stator; S5. Use a hydraulic lifting device to lift the inner stator to the rear of the outer stator; S6. Install the traction tooling at the lower part of the front end of the inner stator, install the inner pad at the bottom of the inner stator, and install a ball limit slider on the left and right sides of the center of the inner stator; S7. Use a hydraulic lifting device to lift the inner stator, insert the front end of the inner stator into the outer stator, and place the inner stator on the inner pad and the outer pad; S8, move the lifting point of the hydraulic lifting device to the rear end of the inner stator, lift the inner stator upward, and hang the traction wire rope on the traction fixture through the guide fixture bolt; S9. Use the traction wire rope to thread the inner stator to the installation position; S10, dismantle all tools and complete the installation of inner and outer stators; The height of the top surface of the inner pad in step S6 is higher than the height of the top surface of the outer pad in step S4, and the height of lifting the inner stator upward in step S8 is the difference between the height of the top surface of the inner pad and the height of the top surface of the outer pad.

2. A method for installing inner and outer stators of a large steam turbine generator according to claim 1, characterized in that: In step S2, the slide plate is arranged along the radial direction of the outer stator, and the slide plate is an arc-shaped plate.

3. A method for installing inner and outer stators of a large steam turbine generator according to claim 1, characterized in that: In step S6, the ball-bearing limit slider includes a limit slider for being mounted on the inner stator and a plurality of balls mounted on an end of the limit slider away from the inner stator.

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