CN210036666U

CN210036666U - Special tool for thrust gap measurement of 250MW unit

Info

Publication number: CN210036666U
Application number: CN201920947167.7U
Authority: CN
Inventors: 薄华; 李英杰; 赵士杰; 王建东; 张浩军; 张长安
Original assignee: Datang International Power Generation Co Ltd
Current assignee: Datang International Power Generation Co Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-02-07
Anticipated expiration: 2029-06-21

Abstract

The utility model provides a special tool for a 250MW unit thrust clearance measurement top rotor, which comprises a casing composed of a symmetrical left casing and a right casing, wherein the casing comprises an upper ring and a lower ring, the upper ring and the lower ring are connected through a vertical rib plate, and the inner diameters of the upper ring and the lower ring are matched with a rotor thin section; the inner wall of the upper ring is matched with the transition shapes of the thinner section and the thicker section of the rotor; the diameter of the upper part of the inner wall of the upper layer ring is matched with the thick section of the rotor; the ring width of the lower ring is more than or equal to 170 mm; the top of the vertical rib plate is welded with the upper ring, and the width of the top of the vertical rib plate is equal to that of the upper ring; the bottom of the vertical rib plate is welded with the lower layer ring, and the width of the bottom is equal to the width of the lower layer ring; the technical problem that the rotor without a convex shoulder structure cannot push the rotor is solved by the scheme, the operation is simple, convenient and flexible, and the damage to equipment cannot be caused.

Description

Special tool for thrust gap measurement of 250MW unit

Technical Field

The utility model belongs to generating set detection technology specifically is 250MW unit does not have convex shoulder rotor and carries out thrust clearance and measure specialized tool.

Background

The generator is the main equipment of whole power plant electricity generation, and the body of generator comprises parts such as stator, rotor, end cover, bearing, and the generator air gap needs measurement adjustment repeatedly, confirms the radial position of rotor in the stator inside well. After the rotor of the 250MW unit penetrates into the stator, the thrust clearance needs to be adjusted and measured repeatedly, and in the operation process, the axial position of the rotor needs to be adjusted repeatedly. The thrust clearance measurement is very necessary, is an essential step for guaranteeing the axial position of the turbine rotor, can effectively reflect and bear the axial thrust on the rotor, determines the axial position of the rotor, keeps proper axial clearance between a movable part and a static part and guarantees the normal operation of a unit.

The rotor of the original generator set is provided with a convex shoulder, and the rotor is pushed by taking the position of the convex shoulder as a force application point when the axial position of the rotor is adjusted so as to realize the adjustment of the air gap. The 250MW unit of power plant carries out equipment transformation because of energy saving and emission reduction needs, because the rotor design technique that originally uses laggard can not continue to use again, changes the rotor in the heat supply transformation, and the rotor that newly drops into is 902 new rotors of turn round blade, and this rotor does not have the shoulder structure compared with old rotor. When the thrust clearance measurement needs to be carried out, the rotor does not have a proper acting point to realize the installation of the pushing equipment, so that the clearance adjustment cannot be carried out.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the problem that 250MW generating set generator does not have convex shoulder rotor structure and can't carry out thrust clearance measurement.

In order to solve the above problem, the utility model adopts the following technical scheme:

a250 MW unit thrust clearance measurement top rotor special tool comprises a casing composed of a left casing and a right casing which are symmetrical, wherein the casing comprises an upper layer ring and a lower layer ring, the upper layer ring and the lower layer ring are connected through a vertical rib plate, and the inner diameters of the upper layer ring and the lower layer ring are matched with a rotor thin section; the inner wall of the upper ring is matched with the transition shapes of the thinner section and the thicker section of the rotor; the diameter of the upper part of the inner wall of the upper layer ring is matched with the thick section of the rotor; the ring width of the lower ring is more than or equal to 170 mm; the top of the vertical rib plate is welded with the upper ring, and the width of the top of the vertical rib plate is equal to that of the upper ring; the bottom of the vertical rib plate is welded with the lower layer ring, and the width of the bottom is equal to the width of the lower layer ring; the bottom of the jack is arranged on the side wall of the bearing box, and the top of the jack is supported on the bottom surface of the lower ring.

The thrust clearance that this scheme provided measures specialized tool, this equipment operation is simple and convenient, nimble, can not cause the damage to equipment. The working principle of the device is that the stress area of the rotor shoulder is enlarged so as to push the rotor to move back and forth, and the basic requirement of measuring the thrust clearance of the rotor is met. The equipment can solve the technical problem that the rotor cannot be pushed, and plays a certain role in protecting the rotor.

Drawings

FIG. 1 is a top view of the case;

FIG. 2 is a view of the right side of the left shroud;

FIG. 3 is a perspective view of the case;

FIG. 4 is a view showing a structure of the installation state of the special tool;

FIG. 5 is a view of the inner wall structure of the upper ring;

FIG. 6 is a view of a lower ring deformation structure;

fig. 7 is the utility model discloses a deformation structure mounted state depression angle structure chart.

The specific implementation mode is as follows:

the original rotor body has a shoulder with the width of 200 mm, so that a jack can be conveniently installed. The new rotor is provided with a small boss which is the boundary of the thin section and the thick section of the rotor, and the width of the small boss is 1 mm. This position cannot be used as a point of force for pushing the rotor.

The utility model discloses a rotor of solving no convex shoulder structure leads to thrust clearance to measure the problem that can't go on, provides a 250MW unit no convex shoulder rotor and carries out thrust clearance and measure specialized tool, combines accompanying 1-5, and its concrete structure is:

a250 MW unit thrust clearance measurement top rotor specialized tool comprises a casing composed of a left casing 1 and a right casing 2 which are symmetrical, the casing comprises an upper layer ring 3 and a lower layer ring 4, the upper layer ring 3 and the lower layer ring 4 are connected through a vertical rib plate 5, and the inner diameters of the upper layer ring 3 and the lower layer ring 4 are matched with a rotor thin section 7; the inner side of the upper ring 3 is matched with the transition shapes of the thin section 7 and the thick section 8 of the rotor; the diameter of the upper part of the inner wall of the upper ring 3 is matched with the rotor thick section 9; the ring width of the lower ring 4 is more than or equal to 170mm, the top of the vertical rib plate 5 is welded with the upper ring 3, and the width of the top of the vertical rib plate is equal to the ring width of the upper ring 3; the bottom of the vertical rib plate 5 is welded with the lower layer ring, and the width of the bottom is equal to the ring width of the lower layer ring 4; the lifting device further comprises a jack 6, the bottom of the jack 6 is arranged on the side wall of the bearing box 9, and the top of the jack is supported on the bottom surface of the lower-layer ring 4.

The jacks 6 are respectively arranged at two symmetrical sides of the casing, synchronously push the lower-layer ring, and ensure the stress balance of the lower-layer ring.

As shown in fig. 6 and 7, the modification example of the present invention: the shape of the lower ring 4 is inner circle and outer square, the bottom surface of the lower ring is fixedly connected with a V-shaped spring piece 10, one corner edge of the V-shaped spring piece 10 is fixedly connected with the lower ring 4 into a whole, and the top of the jack 6 is supported against the outer end of the other corner edge of the V-shaped spring piece 10; two V-shaped spring pieces 10 are arranged, one above and one below the lower ring. The structure of the V-shaped spring is that when the spring is pressed by the supported point, the stress is transmitted to the whole corner edge of the V-shaped spring leaf fixedly connected with the lower ring into a whole, so that when the jack 6 exerts force, the whole upper side of the lower ring is stressed. Therefore, when the jacks 6 are installed, the two jacks 6 can be arranged on the same side, and an operator can conveniently control the two jacks.

Adopt this specialized tool to pass the rotor, realize stator rotor clearance adjustment and measurement, put the cover shell on the rotor at first to the bolt is as an organic whole with left cover shell and right cover shell assembly. The upper ring 3 is pressed against the small boss, thereby clamping the housing position. The jack 6 is taken out and placed between the bearing box 9 and the lower layer ring 4, then the jack 6 is jacked, and the rotor is jacked to the right side (shown in the figure) on the basis of the bearing box 9.

When the left casing 1 and the right casing 2 are fixed by bolts, spring washers are further arranged on the bolts to prevent the nuts from yielding.

The tool is used for a long time in the major repair and minor repair of the steep river power plant # 3- #8 unit, the overhaul efficiency of the unit is improved, and the accuracy of data measurement in the rotor overhaul is improved. The problem that the thrust clearance of a 250MW unit cannot be measured due to the fact that a rotor does not have a convex shoulder is solved, the running mode of the unit with faults is avoided, meanwhile, the safety and stability of the unit are guaranteed, and the social benefit is huge.

The invention utilizes the new rotor boss to manufacture a special casing as a shoulder of the top rotor, and solves the problem that the thrust clearance cannot be measured after the rotor is replaced.

Claims

1. The utility model provides a 250MW unit thrust clearance measures a rotor specialized tool, characterized by: the rotor comprises a shell consisting of a left shell and a right shell which are symmetrical, wherein the shell comprises an upper layer ring and a lower layer ring, the upper layer ring and the lower layer ring are connected through a vertical rib plate, and the inner diameters of the upper layer ring and the lower layer ring are matched with the thin section of the rotor; the inner wall of the upper ring is matched with the transition shapes of the thinner section and the thicker section of the rotor; the diameter of the upper part of the inner wall of the upper layer ring is matched with the thick section of the rotor; the ring width of the lower ring is more than or equal to 170 mm; the top of the vertical rib plate is welded with the upper ring, and the width of the top of the vertical rib plate is equal to that of the upper ring; the bottom of the vertical rib plate is welded with the lower layer ring, and the width of the bottom is equal to the width of the lower layer ring; the bottom of the jack is arranged on the side wall of the bearing box, and the top of the jack is supported on the bottom surface of the lower ring.

2. The special tool for the 250MW unit thrust gap measurement top rotor as claimed in claim 1, wherein: the shape of the lower ring is square inside and outside, the bottom surface of the lower ring is fixedly connected with a V-shaped spring piece, one corner edge of the V-shaped spring piece is fixedly connected with the lower ring into a whole, and the top of the jack is supported against the outer end of the other corner edge of the V-shaped spring; two V-shaped spring pieces are arranged, and one is arranged above and below the lower layer ring; the two jacks are arranged on the same side of the rotor.

3. The special tool for the 250MW unit thrust gap measurement top rotor as claimed in claim 1, wherein: and a spring washer is also arranged on the bolt.