Radial support wedge roller for turbine generator stator wire and method of use

Abstract

The present application belongs to the technical field of steam turbine generator offline tooling, and particularly relates to a radial support wedge-shaped rolling plate for a steam turbine generator stator offline and a use method thereof. The technical scheme is as follows: a radial support wedge-shaped rolling plate for a steam turbine generator stator offline, comprising a wedge-shaped rolling plate seat sleeved on a ring plate of a stator frame, a plurality of wedge-tight grooves opening towards an inner ring of the wedge-shaped rolling plate seat are arranged on the wedge-shaped rolling plate seat, a plurality of waist round holes are arranged in the wedge-tight grooves, a straight wedge block and an arc-shaped wedge block are respectively connected through the waist round holes in the wedge-tight grooves of the wedge-shaped rolling plate seat, the straight wedge block and the arc-shaped wedge block are wedge-locked through a slope, and the inner side of the arc-shaped wedge block is tightly pressed against a cylindrical surface of the ring plate of the stator frame. The present application provides a radial support wedge-shaped rolling plate for a steam turbine generator stator offline and a use method thereof, which can avoid damage to a sealing surface of the ring plate of the stator frame.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steam turbine generator offline tooling, and particularly relates to a radial support wedge-shaped rolling plate for offline of a steam turbine generator stator and a use method. BACKGROUND

[0002] Generally, the weight of a large steam turbine generator stator is more than 200t, and a horizontal offline process needs to be adopted. During the offline process, the stator unit needs to be rotated multiple times, and two annular thick steel plates have been used to be combined on the plane of the ring plate at both ends of the stator base, but the plane is generally used as a sealing surface of the stator base. The entire weight of the stator is borne by the friction force between the offline rolling plate and the end surface of the stator base and the bolt shear force. Because the weight of the stator base is large, a very high torque is required for the combined bolt to generate sufficient friction force, so as to avoid the relative displacement between the offline rolling plate and the stator base.

[0003] In the actual offline process of the stator, after the stator base is rotated multiple times, the combined bolt between the rolling plate and the stator base will be plastically deformed, the prestress will be reduced, and the relative displacement between the rolling plate and the sealing surface of the stator base ring plate will occur. This small displacement is not easy to detect, and finally the sealing surface of the stator base ring plate will be damaged, such as concave, burr, and scratch. The repair is usually carried out by means of repair welding and manual polishing, but there is a large difference in roughness and flatness between the repaired plane and the machined plane of the machine tool, which seriously affects the appearance quality of the product and the subsequent air tightness test of the complete machine, increases the manufacturing cycle of the unit, and slows down the production efficiency. SUMMARY

[0004] In order to solve the above problems existing in the prior art, the purpose of the present application is to provide a radial support wedge-shaped rolling plate for offline of a steam turbine generator stator and a use method, which can avoid damage to the ring plate sealing surface of the stator base.

[0005] The technical scheme adopted by the present application is as follows:

[0006] A radial support wedge-shaped rolling plate for offline of a steam turbine generator stator, comprising a wedge-shaped rolling plate seat sleeved on a ring plate of a stator base, a plurality of wedge tight grooves opening towards the inner circle of the wedge-shaped rolling plate seat are arranged on the wedge-shaped rolling plate seat, a plurality of waist round holes are arranged in the wedge tight grooves, a straight wedge block and an arc-shaped wedge block are respectively connected in the wedge tight grooves of the wedge-shaped rolling plate seat through the waist round holes, the straight wedge block and the arc-shaped wedge block are wedge-acted by the inclined surface, and the inner side of the arc-shaped wedge block is pressed against the cylindrical surface of the ring plate of the stator base.

[0007] The wedge-shaped rolling plate seat of the present application is sleeved on the ring plate of the stator base, so that when the straight wedge block and the arc-shaped wedge block are respectively tightened, the arc-shaped wedge block moves close to the ring plate of the stator base under the wedge action of the inclined surface of the straight wedge block and the arc-shaped wedge block, so that the arc-shaped wedge block presses the cylindrical surface of the ring plate of the stator base.

[0008] When the stator frame is finished, the wedge-shaped rolling plate seat capable of changing the traditional stress mode can change the traditional stress mode that the stator frame weight is borne by friction and bolt shear force into the mode that the stator frame weight is borne by the wedge-shaped rolling plate seat under pressure, thereby effectively avoiding the problem that the sealing fit surface of the rolling plate is damaged in the previous production process, and the reliability of the overall assembly air tightness test is reduced.

[0009] As a preferred scheme of the present application, the wedge groove is a T-shaped groove, the arc-shaped wedge block is T-shaped, and the wide section of the arc-shaped wedge block and the straight wedge block are arranged in the wide section of the T-shaped groove. The wide section of the T-shaped groove can limit the wide section of the arc-shaped wedge block and the straight wedge block, so that the moving distance of the straight wedge block and the arc-shaped wedge block is limited, and the situation that the arc-shaped wedge block damages the cylindrical surface of the ring plate of the stator frame when the bolt is tightened is avoided.

[0010] As a preferred scheme of the present application, the arc-shaped wedge block and the cylindrical surface of the ring plate of the stator frame are provided with an arc-shaped protective copper pad. The thin arc-shaped protective copper pad is used to protect the ring plate of the stator frame from being damaged.

[0011] As a preferred scheme of the present application, one side of the inner ring of the wedge-shaped rolling plate seat is provided with a limiting ring plate, and the limiting ring plate and the ring plate of the stator frame are connected by bolts in the axial direction. The thin ring plate reserved on the wedge-shaped rolling plate seat can be used to axially connect the stator frame and the wedge-shaped rolling plate seat, so that the wedge-shaped rolling plate seat does not slip and is not perpendicular to the central axis of the stator frame.

[0012] As a preferred scheme of the present application, a plurality of rolling plate lifting holes are arranged on the wedge-shaped rolling plate seat. A plurality of rolling plate lifting holes are processed in the circumferential direction of the wedge-shaped rolling plate seat and are used as lifting hanging points when the wedge-shaped rolling plate seat is installed.

[0013] As a preferred scheme of the present application, the straight wedge block and the arc-shaped wedge block are connected to the wedge-shaped rolling plate seat by two bolts. The straight wedge block and the arc-shaped wedge block are connected to the wedge-shaped rolling plate seat at two places, so that the straight wedge block and the arc-shaped wedge block do not rotate.

[0014] As a preferred scheme of the present application, the plurality of wedge grooves are uniformly distributed along the circumferential direction of the wedge-shaped rolling plate seat with the axis of the wedge-shaped rolling plate seat as the center.

[0015] A use method of a radial support wedge-shaped rolling plate of a stator of a steam turbine generator, comprising the following steps:

[0016] The straight wedge block and the arc-shaped wedge block are placed into the wedge groove of the wedge-shaped rolling plate seat, the arc-shaped wedge block is connected to the wedge groove by a limiting bolt, the limiting bolt is moved to one side of the waist round hole close to the outer circle of the wedge-shaped rolling plate seat, and the straight wedge block is connected to the wedge groove by a tensioning bolt.

[0017] The wedge-shaped rolling plate seat is hoisted and set on the ring plate of the stator frame.

[0018] The straight wedge block tensioning bolt is tightened in a symmetrical manner, and the limiting bolt of the arc-shaped wedge block is tightened in a symmetrical manner.

[0019] As a preferred scheme of the present application, after the wedge-shaped rolling plate seat is sleeved on the ring plate of the stator frame, the ring plate of the stator frame and the limiting ring plate of the wedge-shaped rolling plate seat are bolted in the axial direction.

[0020] As a preferred scheme of the present application, after the ring plate of the stator frame and the limiting ring plate of the wedge-shaped rolling plate seat are bolted, and before the tensioning bolt and the limiting bolt are tightened, the arc-shaped protective copper pad is placed between the ring plate cylindrical surface of the frame and the arc-shaped wedge block.

[0021] The present application has the following beneficial effects:

[0022] The wedge-shaped rolling plate seat of the present application is sleeved on the ring plate of the stator frame, so that when the straight wedge block and the arc-shaped wedge block are tightened, the arc-shaped wedge block moves close to the ring plate of the stator frame under the action of the inclined surface of the straight wedge block and the arc-shaped wedge block, so that the arc-shaped wedge block compresses the cylindrical surface of the ring plate of the stator frame. When the stator frame is finished, the wedge-shaped rolling plate seat which is supported in the radial direction can change the traditional stress mode, and the weight of the stator frame which is supported by relying on friction and bolt shear force is changed to the weight of the stator frame which is supported by relying on the wedge-shaped rolling plate seat under pressure, so that the problem of reducing the reliability of the overall assembly air tightness test due to the damage of the sealing matching surface of the rolling plate to the frame in the previous production process can be effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the assembly drawing of the present application and the stator frame;

[0024] Figure 2 is Figure 1 part of the structure diagram in

[0025] Figure 3 is the structure diagram of the wedge-shaped rolling plate seat;

[0026] Figure 4 is Figure 3 part of the structure diagram in

[0027] Figure 5 is the structure diagram of the stator turbine generator frame;

[0028] Figure 6 is the structure diagram of the straight wedge block;

[0029] Figure 7 is the structure diagram of the arc-shaped wedge block.

[0030] In the diagram: 1-Stator base; 2-Wedge roller seat; 3-Straight wedge block; 4-Arc-shaped wedge block; 5-Arc-shaped protective copper pad; 11-Ring plate; 21-Wedge groove; 22-Oval hole; 23-Limiting ring plate; 24-Roller lifting hole; 25-Axial engagement hole; 31-Tightening bolt; 41-Limiting bolt. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0033] like Figures 1-7 As shown, the radial support wedge roller of the turbine generator stator in this embodiment includes a wedge roller seat 2 sleeved on the annular plate 11 of the stator frame 1. The wedge roller seat 2 is provided with a plurality of wedge-tightening grooves 21 opening toward the inner ring of the wedge roller seat 2. A plurality of oval holes 22 are provided in the wedge-tightening grooves 21. Straight wedge blocks 3 and arc-shaped wedge blocks 4 are bolted to the wedge-tightening grooves 21 of the wedge roller seat 2 through the oval holes 22 respectively. The straight wedge blocks 3 and arc-shaped wedge blocks 4 are wedged together by inclined surfaces. The inner side of the arc-shaped wedge blocks 4 is pressed against the cylindrical surface of the annular plate 11 of the stator frame 1.

[0034] The wedge-shaped roller seat 2 is provided with several roller lifting holes 24. These holes 24 are machined circumferentially around the wedge-shaped roller seat 2 and serve as lifting points during installation. Both the straight wedge block 3 and the arc-shaped wedge block 4 are connected to the wedge-shaped roller seat 2 by two bolts. The straight wedge block 3 and the arc-shaped wedge block 4 are connected to the wedge-shaped roller seat 2 at two points to prevent rotation. Several wedging grooves 21 are evenly distributed circumferentially around the axis of the wedge-shaped roller seat 2.

[0035] The wedge-shaped roller seat 2 of the present invention is sleeved on the ring plate 11 of the stator frame 1. When the straight wedge block 3 and the arc-shaped wedge block 4 are tightened respectively, under the wedge action of the inclined surfaces of the straight wedge block 3 and the arc-shaped wedge block 4, the arc-shaped wedge block 4 moves closer to the ring plate 11 of the stator frame 1, thereby pressing the cylindrical surface of the ring plate 11 of the stator frame 1 with the arc-shaped wedge block 4.

[0036] The radial support wedge-shaped rolling plate seat 2 can change the traditional force mode when the stator frame 1 is offline, and the weight of the stator frame 1 is supported by relying on friction and bolt shear force, which is changed to be supported by relying on the pressure of the wedge-shaped rolling plate seat 2, so that the problem of reducing the reliability of the overall assembly air tightness test caused by the damage of the sealing fit surface of the rolling plate to the stator frame in the previous production process can be effectively avoided.

[0037] The wedge groove 21 is a T-shaped groove, the arc-shaped wedge block 4 is T-shaped, and the wide section of the arc-shaped wedge block 4 and the straight wedge block 3 are arranged in the wide section of the T-shaped groove. The wide section of the T-shaped groove can limit the wide section of the arc-shaped wedge block 4 and the straight wedge block 3, so that the moving distance of the straight wedge block 3 and the arc-shaped wedge block 4 is limited, and the situation that the arc-shaped wedge block 4 damages the cylindrical surface of the ring plate 11 of the stator frame 1 when the bolt is tightened too tightly is avoided.

[0038] The arc-shaped protective copper pad 5 is arranged between the arc-shaped wedge block 4 and the cylindrical surface of the ring plate 11 of the stator frame 1. The thin arc-shaped protective copper pad 5 is used to protect the ring plate 11 of the stator frame 1 from being damaged.

[0039] One side of the inner ring of the wedge-shaped rolling plate seat 2 is provided with a limiting ring plate 23, the limiting ring plate 23 is uniformly provided with an axial clamping hole 25, and the limiting ring plate 23 is axially connected with the ring plate 11 of the stator frame 1 through the axial clamping hole 25. The thin ring plate 11 reserved on the wedge-shaped rolling plate seat 2 can be used to axially connect the stator frame 1 and the wedge-shaped rolling plate seat 2, so that the wedge-shaped rolling plate seat 2 is prevented from slipping and not being perpendicular to the central axis of the stator frame 1.

[0040] The use method of the radial support wedge-shaped rolling plate of the stator of the steam turbine generator in the embodiment comprises the following steps:

[0041] S1: The straight wedge block 3 and the arc-shaped wedge block 4 are placed into the wedge groove 21 of the wedge-shaped rolling plate seat 2, the arc-shaped wedge block 4 is connected into the wedge groove 21 by using the limiting bolt 41, the limiting bolt 41 is moved into the waist round hole 22 and is close to one side of the outer circle of the wedge-shaped rolling plate seat 2, and the straight wedge block 3 is connected into the wedge groove 21 by using the tension bolt 31;

[0042] S2: The wedge-shaped rolling plate seat 2 is hoisted and set on the ring plate 11 of the stator frame 1, the wedge-shaped rolling plate seat 2 is adjusted to be centered with the ring plate 11 of the stator frame 1, and the ring plate 11 of the stator frame 1 is axially connected with the limiting ring plate 23 of the wedge-shaped rolling plate seat 2 through the bolt;

[0043] S3: The limiting bolt 41 of the arc-shaped wedge block 4 is loosened, the arc-shaped protective copper pad 5 is placed between the cylindrical surface of the ring plate 11 of the stator frame 1 and the arc-shaped wedge block 4, and the cylindrical surface of the ring plate 11 of the stator frame 1 is prevented from being damaged by the arc-shaped wedge block 4 due to excessive pressure;

[0044] S4: Tighten the tension bolt 31 of the straight wedge block 3 in a symmetrical manner, and make the arc-shaped wedge block 4 move radially by using the inclined surface, and abut against the cylindrical surface of the ring plate 11 of the stator frame 1; and tighten the limiting bolt 41 of the arc-shaped wedge block 4 in a symmetrical manner.

[0045] S5: Assemble the wedge-shaped roller plate seat 2 at the other end according to the above method, and complete the assembly of the wedge-shaped roller plate seat 2 which is fixed and supported radially.

[0046] For the stator frames of different capacity models, the arc-shaped wedge block 4 can be replaced, and the corresponding axial joint holes 25 can be machined on the limiting ring plate 23.

[0047] The wedge-shaped roller plate seat 2 of the present application supports the stator frame 1 radially, and effectively supports the weight of the stator by the inclined surface of the wedge block. The weight of the stator frame 1 is changed from the end surface of the ring plate 11 to the cylindrical surface of the ring plate 11, so that the damage of the end surface (the sealing surface) of the ring plate 11 can be avoided, the requirement of the three-section stator frame 1 can be met, and the disadvantage that the traditional offline roller plate relies on the friction force and the bolt shear force to bear the weight of the stator and damages the sealing surface of the ring plate 11 of the stator frame 1 can be avoided. At the same time, because the difference between the ring plate 11 of the stator frame 1 of the 300MW series unit and the 600MW series unit is small, only the arc-shaped wedge block 4 needs to be replaced, so that the stator frame 1 can be used universally, and obvious effects can be achieved in improving the production efficiency, the assembly safety, and protecting the sealing machining surface of the product.

[0048] The present application is not limited to the above-mentioned optional embodiments, and anyone can derive other various forms of products under the inspiration of the present application, but regardless of any changes in shape or structure, any technical solution falling within the scope defined by the claims of the present application falls within the protection scope of the present application.

Claims

1. A radial support wedge rollerboard for a steam turbine generator stator coil, characterized by: The wedge-shaped rolling plate base (2) is sleeved on the ring plate (11) of the stator frame (1), and a plurality of wedge grooves (21) are arranged on the wedge-shaped rolling plate base (2) and open towards the inner ring of the wedge-shaped rolling plate base (2); a plurality of waist round holes (22) are arranged in the wedge grooves (21); a straight wedge block (3) and an arc-shaped wedge block (4) are respectively connected to the wedge grooves (21) of the wedge-shaped rolling plate base (2) through the waist round holes (22) by bolts; the straight wedge block (3) and the arc-shaped wedge block (4) are wedge-shaped against each other through inclined surfaces; the inner side of the arc-shaped wedge block (4) is pressed against the cylindrical surface of the ring plate (11) of the stator frame (1). The wedge groove (21) is a T-shaped groove, and the arc-shaped wedge block (4) is also T-shaped; the wide section of the arc-shaped wedge block (4) and the straight wedge block (3) are arranged in the wide section of the T-shaped groove. An arc-shaped protective copper pad (5) is arranged between the cylindrical surface of the ring plate (11) of the stator frame (1) and the arc-shaped wedge block (4). One side of the inner ring of the wedge-shaped rolling plate base (2) is provided with a limiting ring plate (23), and the limiting ring plate (23) is connected to the ring plate (11) of the stator frame (1) by bolts in the axial direction.

2. A radial support wedge rollerboard for a stator of a turbogenerator according to claim 1, characterized in that: A plurality of rolling plate lifting holes (24) are arranged on the wedge-shaped rolling plate base (2).

3. A radial support wedge rollerboard for a stator of a turbogenerator according to claim 1, characterized in that: The straight wedge block (3) and the arc-shaped wedge block (4) are connected to the wedge-shaped rolling plate base (2) by two bolts.

4. A radial support wedge rollerboard for a stator of a turbogenerator according to claim 1, characterized in that: The plurality of wedge grooves (21) are uniformly distributed along the circumferential direction of the wedge-shaped rolling plate base (2) with the axis of the wedge-shaped rolling plate base (2) as the center.

5. A method of using the radial support wedge-shaped runner of claim 1 for a radial support wedge-shaped runner of a stator of a turbogenerator, characterized in that: The method comprises the following steps: The straight wedge block (3) and the arc-shaped wedge block (4) are placed into the wedge grooves (21) of the wedge-shaped rolling plate base (2); the arc-shaped wedge block (4) is connected to the wedge groove (21) by a limiting bolt (41); the limiting bolt (41) is moved into the waist round hole (22) and is close to one side of the outer circle of the wedge-shaped rolling plate base (2); the straight wedge block (3) is connected to the wedge groove (21) by a tensioning bolt (31); The wedge-shaped rolling plate base (2) is hoisted and sleeved on the ring plate (11) of the stator frame (1); The tensioning bolts (31) of the straight wedge blocks (3) are tightened in a symmetrical manner one by one, and the limiting bolts (41) of the arc-shaped wedge blocks (4) are tightened in a symmetrical manner one by one.

6. A method of using a radial support wedge for a turbine generator stator coil according to claim 5, wherein: After the wedge-shaped rolling plate base (2) is hoisted and sleeved on the ring plate (11) of the stator frame (1), the ring plate (11) of the stator frame (1) is connected to the limiting ring plate (23) of the wedge-shaped rolling plate base (2) by bolts in the axial direction.

7. A method of using a radial support wedge for a turbine generator stator coil according to claim 6, wherein: After the ring plate (11) of the stator frame (1) is connected to the limiting ring plate (23) of the wedge-shaped rolling plate base (2) by bolts, and before the tensioning bolts (31) and the limiting bolts (41) are tightened, the arc-shaped protective copper pad (5) is placed between the cylindrical surface of the ring plate (11) of the stator frame (1) and the arc-shaped wedge block (4).

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