CN214221277U - Axial limiting device for steam turbine rotor - Google Patents

Abstract

The utility model belongs to the field of rotating equipment maintenance, in particular to an axial limiting device of a steam turbine rotor, which comprises a limiting bolt, a limiting nut, a locking nut, a fixing bolt and a fixing plate; the fixing plate is positioned on the split surface in the bearing box of the steam turbine and fixedly connected with the split surface in the bearing box of the steam turbine through a fixing bolt; the limiting nut is positioned at the lower edge of the top surface of the fixing plate and is fixedly connected with the fixing plate; the limiting bolt is sleeved in the limiting nut, the limiting bolt is connected with the limiting nut in a matching mode, the axial center line of the limiting bolt is parallel to the axial center line of the steam turbine rotor and abuts against the shaft shoulder of the steam turbine rotor, and the top end of the limiting bolt is connected with a steam turbine rotor convex shoulder on the steam turbine rotor; the locking nut is sleeved outside the limiting bolt from the bottom end of the limiting bolt, and the locking nut is connected with the limiting bolt in a matched mode. The utility model discloses can realize effective spacing of steam turbine rotor, avoid rotor barring in-process part to bump the mill, the emergence of accidents such as equipment damage.

Description

Axial limiting device for steam turbine rotor

Technical Field

The utility model belongs to rotating equipment overhauls the field, concretely relates to steam turbine rotor axial stop device.

Background

When a steam turbine of a nuclear power station or a thermal power station is arranged in a longitudinal mode, the mass of a reactor or a boiler room and the mass of an electric booster station are seriously asymmetric, the mass of a high cylinder, the mass of a low cylinder and the mass of a generator of the steam turbine are different greatly, after long-term operation, the factors cause the pressure of each part of a foundation to be unequal, and then the foundation is unevenly settled, and meanwhile, for the steam turbine generator set, the mass of the part from a condenser to the generator along the axial length is far larger than that of the high cylinder and the medium cylinder (if any), and the factors can cause the foundation to be unevenly settled. The uneven settlement of basis directly influences steam turbine generating set shafting center, and steam turbine generating set will lead to the change at shafting center through factors such as the wearing and tearing of long-term operation back axle bush simultaneously, consequently is essential link to the alignment at steam turbine generating set shafting center during overhaul, need use the rotation of the disrotatory rotors such as crane, crane among the alignment process. Meanwhile, according to an equipment operation and maintenance manual, the steam turbine rotor needs to be subjected to shaking, deflection measurement and movable and fixed blade friction inspection during the equipment material changing overhaul period, and a crane, a crane and other disc-moving rotors need to be used for rotation in the measurement and inspection processes.

A certain nuclear power steam turbine adopts single-shaft, four-cylinder, six-exhaust and reheating condensing type design, the total length of a shaft system is about 59.2m, the nuclear power steam turbine mainly comprises a high-pressure cylinder and three low-pressure cylinders, wherein the high-pressure cylinder and the low-pressure cylinder both adopt a double-split structure, the rotor adopts a block forged rotor, the weight of the high-pressure rotor is about 85t, the length of the high-pressure rotor is about 9m, the weight of the high-pressure rotor is lower than about 185t, the length of the high-pressure rotor is about 10m, and the axial minimum through-flow gap between a rotating part and a static part of the high-pressure and low-pressure cylinders is 15 mm.

In the alignment, the sway and the ladling deflection measurement of the center of the shaft system and the friction inspection process of the movable and stationary blades, the rotating part generates axial float, the larger the weight of the rotating part is, the longer the shaft system is, the larger the axial float is, the higher the possibility that the rotating part and the stationary part are collided and rubbed is, once the collision and rubbing are generated, the scratch is generated on the surfaces of the blade root and the partition plate at a light position, the abnormal conditions such as deformation, bending and abnormal sound of the rotating part and the stationary part are caused at a heavy position, and even the equipment is damaged when the conditions are serious.

In view of the above, it is desirable to develop an axial position limiter for a steam turbine rotor to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a steam turbine rotor axial stop device, the device can realize steam turbine rotor's effective spacing, avoids rotor barring in-process part to bump the mill, the emergence of accidents such as equipment damage.

Realize the utility model discloses the technical scheme of purpose:

a steam turbine rotor axial stop arrangement, the arrangement comprising: the device comprises a limiting bolt, a limiting nut, a locking nut, a fixing bolt and a fixing plate; the fixing plate is positioned on the split surface in the bearing box of the steam turbine and fixedly connected with the split surface in the bearing box of the steam turbine through a fixing bolt; the limiting nut is positioned at the lower edge of the top surface of the fixing plate and is fixedly connected with the fixing plate; the limiting bolt is sleeved in the limiting nut, the limiting bolt is connected with the limiting nut in a matching mode, the axial center line of the limiting bolt is parallel to the axial center line of the steam turbine rotor and abuts against the shaft shoulder of the steam turbine rotor, and the top end of the limiting bolt is connected with a steam turbine rotor convex shoulder on the steam turbine rotor; the locking nut is sleeved outside the limiting bolt from the bottom end of the limiting bolt, and the locking nut is connected with the limiting bolt in a matched mode.

Further, the device further comprises a soft package, the soft package is located at the top of the limiting bolt, and the soft package is fixedly connected with the limiting bolt.

Further, the soft package is fixedly connected with the limiting bolt through fusion welding.

Further, the soft package is made of copper, tin, babbitt alloy or other soft materials.

Furthermore, the device also comprises a through hole which is arranged on the fixing plate, the through hole penetrates through the top surface and the bottom surface of the fixing plate and corresponds to a threaded hole of the split surface in the bearing box of the steam turbine, and the fixing bolt penetrates through the through hole and is connected with the threaded hole in a matched mode.

Furthermore, the through hole is in a long strip shape.

Furthermore, the device also comprises a gasket, the gasket is positioned on the top surface of the fixing plate and sleeved outside the fixing bolt, and the top surface and the bottom surface of the gasket are respectively jointed with the fixing bolt and the fixing plate.

Furthermore, the limiting nut is fixedly connected with the fixing plate through welding.

The utility model has the advantages of:

1. the axial limiting device of the steam turbine rotor provided by the utility model has simple structure and is convenient for operation, maintenance and overhaul;

2. the axial limiting device of the steam turbine rotor provided by the utility model has reasonable structural design, fully utilizes the structure of the steam turbine body, and can complete the installation and the removal of the limiting device without changing the mechanism of the steam turbine;

3. the bolt through hole of the axial limiting device of the steam turbine rotor provided by the utility model adopts the strip-shaped bolt through hole, which not only can realize the connection and fixation functions through the connecting bolt, but also is convenient to install and adjust according to the corresponding threaded hole position;

4. the axial limiting device for the steam turbine rotor provided by the utility model can avoid the accidents of collision and abrasion of parts, equipment damage and the like in the turning process of the rotor;

5. the axial limiting device of the steam turbine rotor provided by the utility model can realize effective positioning of the rotor and accurately realize positioning of the gap between the moving rotor and the static rotor;

6. the utility model provides a non-turbine rotor contact surface of the axial limiting device of the turbine rotor at the installation contact position, which can effectively avoid the damage to the contact surface when the turbine rotor rotates;

7. the utility model provides a pair of steam turbine rotor axial stop device adopts spacing bolt can be according to the difference of unit size and adjust, need not reprocess, has the universality.

Drawings

Fig. 1 is an installation schematic view of a steam turbine rotor axial limiting device provided by the present invention;

fig. 2 is a schematic structural diagram of the axial limiting device for a steam turbine rotor according to the present invention.

In the figure: 1. a turbine rotor; 2. a turbine rotor shoulder; 3. soft wrapping; 4. a limit bolt; 5. a limit nut; 6. locking the nut; 7. a through hole; 8. a gasket; 9. fixing the bolt; 10. splitting the surface in the bearing box; 11. and (7) fixing the plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1-2, the utility model provides a steam turbine rotor axial stop device, include: soft parcel 3, limit bolt 4, limit nut 5, lock nut 6, through-hole 7, gasket 8, fixing bolt 9 and fixed plate 11.

The fixing plate 11 is positioned on the bearing box parting surface 10 of the steam turbine, the fixing plate 11 is provided with a plurality of strip-shaped through holes 7, and the through holes 7 penetrate through the top surface and the bottom surface of the fixing plate 11 and correspond to threaded holes of the bearing box parting surface 10 of the steam turbine. The gasket 8 is positioned on the top surface of the fixing plate 11, and the fixing bolt 9 passes through the gasket 8 and the through hole 7, is screwed into a threaded hole of the split surface 10 in the bearing box of the steam turbine, and is connected with the threaded hole in a threaded fit mode. The fixing plate 11 is fixedly connected with the bearing box inner parting surface 10 of the steam turbine through the threaded connection of the fixing bolt 9 and the threaded hole, and the top surface and the bottom surface of the gasket 8 are respectively connected with the fixing bolt 9 and the fixing plate 11, so that the connection of the fixing plate 11 and the bearing box inner parting surface 10 of the steam turbine is tighter.

The limiting nut 5 is located at the lower edge of the top surface of the fixing plate 11, and the limiting nut 5 is fixedly connected with the fixing plate 11 through welding. The limiting bolt 4 is sleeved in the limiting nut 5, the limiting bolt 4 is connected with the limiting nut 5 in a threaded fit mode, the axial center line of the limiting bolt 4 is parallel to the axial center line of the steam turbine rotor 1 and abuts against the shaft shoulder of the steam turbine rotor, and the steam turbine rotor 1 is limited. The top of the limit bolt 4 is connected with a copper soft package 3 in a fusion welding mode, the top end of the limit bolt 4 is connected with a turbine rotor convex shoulder 2 on the turbine rotor 1 through the soft package 3, the turbine rotor 1 is prevented from moving, and axial limiting of the turbine rotor 1 is achieved. The top of the limit bolt 4 is connected with the soft package 3, so that the contact between the limit bolt 4 and the convex shoulder 2 of the turbine rotor can be effectively buffered, and the collision damage can be avoided.

The locking nut 6 is sleeved outside the limiting bolt 4 from the bottom end of the limiting bolt 4, and the locking nut 6 is connected with the limiting bolt 4 in a threaded fit mode and used for locking the position of the limiting bolt 4.

The utility model discloses a steam turbine rotor axial stop device's application method specifically as follows:

step A1, checking and confirming that the coupling bolts of the turbine rotor are removed;

step A2, checking and confirming that the turbine rotor bearing is lubricated by adding lubricating oil;

step A3, using tools such as jackscrews and jacks to match, and taking out the rotor coupling gasket;

step A4, checking to confirm that the turning gear is installed properly;

step A5, installing the axial stop device of the turbine rotor, including:

step A5.1, cleaning the split surfaces 10 in the bearing box, wherein hard particles do not exist, and the split surfaces are prevented from being damaged;

step A5.2, the limiting bolt 4 is arranged in the limiting nut 5, and the locking nut 6 is arranged on the limiting bolt 4;

step A5.3, placing the fixing plate 11 at the position of the parting surface 10 in the bearing box to ensure that the limiting bolt 4 can be completely contacted with the convex shoulder 2 of the turbine rotor, and the threaded hole of the parting surface 10 in the bearing box is completely arranged in the through hole 7 of the fixing plate 11;

step A5.4, mounting a fixing plate 11 on a split surface 10 of a bearing box through a fixing bolt 9 and a gasket 8, and fastening in place;

step A5.5, adjusting the distance between the limiting bolt 4 and the turbine rotor shoulder 2 according to actual requirements of field maintenance;

and step A5.6, fastening the locking nut 6 in place.

Step A6, coiling the turbine rotor 1, and after the turbine rotor shoulder 2 is contacted with the limit bolt 4, the turbine rotor realizes axial limit.

The utility model discloses a method of demolising of steam turbine rotor axial stop device is as follows:

step B1, loosening the locking nut 6;

step B2, loosening the limit bolt 4 to ensure that the limit bolt is not contacted with the convex shoulder 2 of the turbine rotor;

step B3, loosening and removing the fixing bolt 9;

and B4, removing the rest parts of the axial limiting device of the turbine rotor.

The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the above examples, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. The present invention can adopt the prior art for the content which is not described in detail in the present invention.

Claims (8)

1. A steam turbine rotor axial stop arrangement, the arrangement comprising: the device comprises a limiting bolt (4), a limiting nut (5), a locking nut (6), a fixing bolt (9) and a fixing plate (11); the fixing plate (11) is positioned on the bearing box split surface (10) of the steam turbine, and the fixing plate (11) is fixedly connected with the bearing box split surface (10) of the steam turbine through a fixing bolt (9); the limiting nut (5) is positioned at the lower edge of the top surface of the fixing plate (11), and the limiting nut (5) is fixedly connected with the fixing plate (11); the limiting bolt (4) is sleeved in the limiting nut (5), the limiting bolt (4) is connected with the limiting nut (5) in a matching mode, the axial center line of the limiting bolt (4) is parallel to the axial center line of the turbine rotor (1) and abuts against the shaft shoulder of the turbine rotor, and the top end of the limiting bolt (4) is connected with the turbine rotor convex shoulder (2) on the turbine rotor (1); the locking nut (6) is sleeved on the outer side of the limiting bolt (4) from the bottom end of the limiting bolt (4), and the locking nut (6) is connected with the limiting bolt (4) in a matched mode.

2. The axial limiting device of a steam turbine rotor according to claim 1, characterized in that the device further comprises a soft package (3), the soft package (3) is located on the top of the limiting bolt (4), and the soft package (3) is fixedly connected with the limiting bolt (4).

3. The axial position limiter of steam turbine rotor as claimed in claim 2, wherein the flexible wrap (3) is fixedly connected to the position limiter bolt (4) by welding.

4. The axial position limiter of steam turbine rotor as claimed in claim 2, wherein the soft coating (3) is made of copper, tin, babbitt metal or other soft material.

5. The axial limiting device for the steam turbine rotor according to claim 1, characterized in that the device further comprises a through hole (7), the through hole (7) is arranged on the fixing plate (11), the through hole (7) penetrates through the top surface and the bottom surface of the fixing plate (11) and corresponds to a threaded hole of the bearing box split surface (10) of the steam turbine, and the fixing bolt (9) penetrates through the through hole (7) to be connected with the threaded hole in a matching manner.

6. The axial stop device for steam turbine rotors according to claim 5, characterized in that said through holes (7) are elongated.

7. The steam turbine rotor axial limiting device according to claim 1, characterized in that the device further comprises a gasket (8), the gasket (8) is located on the top surface of the fixing plate (11), the gasket (8) is sleeved outside the fixing bolt (9), and the top surface and the bottom surface of the gasket (8) are respectively engaged with the fixing bolt (9) and the fixing plate (11).

8. The axial position limiter of steam turbine rotor as claimed in claim 1, wherein the position limiter nut (5) is fixedly connected to the fixing plate (11) by welding.

Images