Steam turbine rotor heat run radial run-out detection device

Abstract

The utility model relates to a steam turbine rotor heat run radial run-out detection device, which belongs to the technical field of measuring equipment and comprises two bases fixed on the ground, an upper arc-shaped cover plate is arranged at the upper end of each base, a circular through hole for mounting a lantern ring is formed between each base and the corresponding upper arc-shaped cover plate, and a bearing is mounted outside each lantern ring. Supporting rods are arranged on the two sides of the upper arc-shaped cover plate and the two sides of the base. An oil cylinder is installed between the upper supporting rod and the lower supporting rod. A set of moving mechanism used for driving the lantern ring to move is further arranged on the ground, the moving mechanism comprises a support, a motor and a ground rail, a lead screw is installed between the support and the motor, two brackets are installed on the lead screw, first sliding blocks are arranged at the bottom ends of the brackets and installed on the ground rail, and two supporting cylinders are arranged on the brackets. The lantern ring is placed on the two supporting barrels, the lantern ring is driven by the moving mechanism to move horizontally, the oil cylinder drives the upper arc-shaped cover plate to ascend and descend, the steam turbine rotor and the lantern ring are in surface contact, stress is obviously optimized, deformation is not prone to occurring, the lantern ring replacement cost is low, and efficiency is high.

Description

Technical Field

[0001] The utility model relates to a radial runout detection device for a steam turbine rotor during hot running, belonging to the technical field of measuring equipment. Background Art

[0002] A steam turbine is a rotary power machine that converts the energy of steam into mechanical work. It is the most widely used prime mover in modern thermal power plants, having advantages such as large single-unit power, high efficiency, and long service life. The steam turbine rotor is the general term for the rotating part of the steam turbine, and its main function is to collect the mechanical energy obtained on each stage of moving blade grids and transmit it to the generator rotor. The thermal stability test, commonly known as hot running, is a unique test item for integral forging rotors of steam turbines. The so-called thermal stability refers to the ability of the rotor to maintain axial symmetry in the hot state. The thermal stability test is to heat the rotor to a specified temperature (generally 30 - 60 °C higher than the working temperature), measure its radial runout, and compare it with the cold-state radial runout. The purpose of the test is to ensure the stable operation of the rotor under high-temperature conditions.

[0003] When the rotor is hot running, the two ends of the rotor are respectively placed on two sets of roller supports composed of brackets and rollers, and rotate slowly continuously. During this period, the radial runout of the rotor is continuously measured, and the rotation accuracy requirements for the rollers are very high.

[0004] The contact between the rotor and the rollers is theoretically a line contact. However, due to the rotor being several meters long and there being an offset in the center between the two sets of roller supports, the contact between the rotor and the rollers actually tends to be a point contact. The rotor weighs at least several tons, and the acting points of contact with the rollers are subjected to very large forces. After several hot runs, the rollers will be deformed, and the circular runout is too large, no longer meeting the use requirements. The cost of replacing and debugging the rollers is relatively high. Content of the Utility Model

[0005] The purpose of the utility model is to solve the technical problems of high use cost, time-consuming and laborious operation existing in the prior art, and provide a radial runout detection device for a steam turbine rotor during hot running.

[0006] The utility model is realized through the following technical solutions:

[0007] That is, a radial runout detection device for a steam turbine rotor during hot running includes two bases fixed on the ground. An upper arc-shaped cover plate is provided at the upper end of the base. A circular through-hole for installing a collar is formed between the base and the upper arc-shaped cover plate. A bearing is installed outside the collar. Support rods are provided on both sides of the upper arc-shaped cover plate and both sides of the base. An oil cylinder is installed between the upper and lower support rods;

[0008] There is also a moving mechanism provided on the ground for driving the collar to move. The moving mechanism includes a support, a motor, and a ground rail. A lead screw is installed between the support and the motor. Two brackets are installed on the lead screw. A first slider is provided at the bottom of the bracket and is installed on the ground rail. Two support cylinders are provided on the bracket.

[0009] The utility model uses a collar that matches the diameter of the steam turbine rotor and also uses a bearing that matches the collar. Collars with different inner diameters need to be replaced for different-sized steam turbine rotors. When replacing the collar, the collar is placed on the two support cylinders, and the moving mechanism drives the collar to translate. The oil cylinder drives the upper arc-shaped cover plate to lift and lower. The steam turbine rotor and the collar are in surface contact, the force is significantly optimized, and deformation is not likely to occur. The cost of replacing the collar is low and the efficiency is high.

[0010] Further preferably, the thread directions on both sides of the lead screw are opposite with the middle as the boundary. When replacing two collars at one time, the moving mechanism drives the two collars to move towards their respective bases simultaneously, which helps to further improve the efficiency of replacing the collar.

[0011] Further preferably, there is also a pushing mechanism for pushing the collar into the base. The moving mechanism of the pushing mechanism includes the same support, motor, and ground rail as the moving mechanism. A lead screw is installed between the support and the motor. Two brackets are installed on the lead screw of the pushing mechanism. A second slider is provided at the bottom of the bracket, and a circular ring member is fixedly provided at the top of the bracket. The second slider is installed on the ground rail of the pushing mechanism. The motor of the pushing mechanism drives the lead screw of the pushing mechanism to drive the bracket to move along the ground rail of the pushing mechanism. Push rods are fixedly provided on both sides of the circular ring member. The thread directions on both sides of the lead screw of the pushing mechanism are opposite with the middle as the boundary. The pushing mechanism drives the push rods to move to push the collar into the base, with a high degree of automation and higher efficiency at the same time.

[0012] Further preferably, four push rods are respectively fixedly provided on both sides of the upper part of the circular ring member.

[0013] Further preferably, the four push rods are evenly arranged on the side surface of the upper part of the circular ring member. By pushing the collar with the four push rods, the collar is not likely to shift, and the collar can enter the base more smoothly.

[0014] Further preferably, through holes are provided on the base, and the lead screw passes through the through holes.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model uses a collar that matches the diameter of the steam turbine rotor, and also uses a bearing that matches the collar. Steam turbine rotors of different sizes need to replace the collars with different inner diameters. When replacing the collar, place the collar on two supporting cylinders, drive the collar to translate through a moving mechanism, and drive the upper arc-shaped cover plate to lift by an oil cylinder. The steam turbine rotor and the collar are in surface contact, the force is significantly optimized, and deformation is not likely to occur. The cost of replacing the collar is low and the efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the specific embodiment of the present utility model.

[0019] Figure 2 It is a schematic side view structure diagram of the base and the upper arc-shaped cover plate in the specific embodiment of the present utility model.

[0020] Figure 3 It is a schematic side view structure diagram of the bracket and the supporting cylinder in the specific embodiment of the present utility model.

[0021] In the figure: 1. Base; 2. Motor; 3. Upper arc-shaped cover plate; 4. Collar; 5. Bearing; 6. Support rod; 7. Oil cylinder; 8. Bracket; 9. Slide block one; 10. Supporting cylinder; 11. Support; 12. Lead screw; 13. Bracket; 14. Push rod; 15. Ground rail; 16. Slide block two; 17. Ring part. SPECIFIC EMBODIMENTS

[0022] The following further describes the specific embodiments of the present utility model with reference to the drawings.

[0023] As Figures 1 to 3 shown, a radial runout detection device for a steam turbine rotor during hot running includes two bases 1 fixed on the ground. An upper arc-shaped cover plate 3 is provided at the upper end of the base 1. A circular through hole for installing a collar 4 is formed between the base 1 and the upper arc-shaped cover plate 3. A bearing 5 is installed outside the collar 4. Support rods 6 are provided on both sides of the upper arc-shaped cover plate 3 and both sides of the base 1. An oil cylinder 7 is installed between the upper and lower support rods 6;

[0024] A moving mechanism for driving the movement of the collar 4 is also provided on the ground. The moving mechanism includes a support 11, a motor 2, and a ground rail 15. A lead screw 12 is installed between the support 11 and the motor 2. A through hole is formed in the base 1, and the lead screw 12 passes through the through hole. Two brackets 8 are installed on the lead screw 12. A first slider 9 is provided at the bottom of the bracket 8, and the first slider 9 is installed on the ground rail 15. Two support cylinders 10 are provided on the bracket 8.

[0025] The utility model uses a collar 4 that matches the diameter of the steam turbine rotor, and also uses a bearing 5 that matches the collar 4. Collars 4 with different inner diameters need to be replaced for different sizes of steam turbine rotors. When replacing the collar 4, the collar 4 is placed on the two support cylinders 10, and the moving mechanism drives the collar 4 to translate. The oil cylinder 7 drives the upper arc-shaped cover plate 3 to lift and lower. The steam turbine rotor and the collar 4 are in surface contact, the force is significantly optimized, and deformation is not likely to occur. The cost of replacing the collar 4 is low and the efficiency is high.

[0026] Among them, the thread directions on both sides of the lead screw 12 are opposite with the middle as the boundary. When replacing two collars 4 at one time, the moving mechanism drives the two collars 4 to move towards their respective bases 1 simultaneously, which helps to further improve the efficiency of replacing the collar 4.

[0027] Among them, a pushing mechanism for pushing the collar 4 into the base 1 is also included. The moving mechanism of the pushing mechanism includes the same support 11, motor 2, and ground rail 15 as the moving mechanism. A lead screw 12 is installed between the support 11 and the motor 2. Two brackets 13 are installed on the lead screw 12 of the pushing mechanism. A second slider 16 is provided at the bottom of the bracket 13, and a circular ring member 17 is fixedly provided at the top of the bracket 13. The second slider 16 is installed on the ground rail 15 of the pushing mechanism. The motor 2 of the pushing mechanism drives the lead screw 12 of the pushing mechanism to drive the bracket 13 to move along the ground rail 15 of the pushing mechanism. Push rods 14 are fixedly provided on both sides of the circular ring member 17. The thread directions on both sides of the lead screw 12 of the pushing mechanism are opposite with the middle as the boundary. The pushing mechanism drives the push rods 14 to move to push the collar 4 into the base 1, with a high degree of automation and higher efficiency at the same time.

[0028] Among them, four push rods 14 are respectively fixedly provided on both sides of the upper part of the circular ring member 17, and the four push rods 14 are evenly arranged on the side surface of the upper part of the circular ring member 17. By pushing the collar 4 with the four push rods 14, the collar 4 is not likely to shift, and the collar 4 can enter the base more smoothly.

[0029] Working principle:

[0030] The utility model uses a collar 4 that matches the diameter of the steam turbine rotor, and also uses a bearing 5 that matches the collar 4. Collars 4 with different inner diameters need to be replaced for steam turbine rotors of different sizes. When replacing the collar 4, the collar 4 is placed on two supporting cylinders 10, and the moving mechanism drives the collar 4 to translate. The pushing mechanism pushes the collar 4 into the base 1 through a push rod 14. The oil cylinder 7 drives the upper arc-shaped cover plate 3 to move up and down. After the collar 4 is pressed tightly, the steam turbine rotor to be detected is inserted into the two collars 4. The steam turbine rotor is in surface contact with the collar 4, the force is significantly optimized, and deformation is not likely to occur. The cost of replacing the collar 4 is low and the efficiency is high.

[0031] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts among the various embodiments, reference can be made to each other.

[0032] The terms "upper", "lower", "outer side", "inner side", etc. in the specification, claims and above-mentioned drawings of the present utility model, if any, are used to distinguish the relative relationship in position and do not need to be given a qualitative definition. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0033] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermal running radial runout detection device for a steam turbine rotor, characterized in that, It includes two bases (1) fixed on the ground. An upper arc-shaped cover plate (3) is provided at the upper end of the base (1). A circular through-hole for installing a collar (4) is formed between the base (1) and the upper arc-shaped cover plate (3). A bearing (5) is installed outside the collar (4). Support rods (6) are provided on both sides of the upper arc-shaped cover plate (3) and both sides of the base (1). An oil cylinder (7) is installed between the upper and lower support rods (6). A moving mechanism for driving the collar (4) to move is also provided on the ground. The moving mechanism includes a support (11), a motor (2), and a ground rail (15). A lead screw (12) is installed between the support (11) and the motor (2). Two brackets (8) are installed on the lead screw (12). A slider one (9) is provided at the bottom of the bracket (8). The slider one (9) is installed on the ground rail (15). Two support cylinders (10) are provided on the bracket (8).

2. The radial runout detection device for a steam turbine rotor during hot running according to claim 1, wherein, The thread directions on both sides of the lead screw (12) are opposite with the middle as the boundary.

3. A radial runout detection device for a steam turbine rotor during hot running according to claim 1, characterized in that, It also includes a pushing mechanism for pushing the collar (4) into the base (1). The moving mechanism of the pushing mechanism includes the same support (11), motor (2), and ground rail (15) as the moving mechanism. A lead screw (12) is installed between the support (11) and the motor (2). Two brackets (13) are installed on the lead screw (12) of the pushing mechanism. A slider two (16) is provided at the bottom of the bracket (13). A circular ring member (17) is fixedly provided at the top of the bracket (13). The slider two (16) is installed on the ground rail (15) of the pushing mechanism. The motor (2) of the pushing mechanism drives the lead screw (12) of the pushing mechanism to drive the bracket (13) to move along the ground rail (15) of the pushing mechanism. Push rods (14) are fixedly provided on both side surfaces of the circular ring member (17). The thread directions on both sides of the lead screw (12) of the pushing mechanism are opposite with the middle as the boundary.

4. A radial runout detection device for a steam turbine rotor during hot running according to claim 3, characterized in that, Four push rods (14) are respectively and fixedly provided on both sides of the upper part of the circular ring member (17).

5. A steam turbine rotor thermal runout radial runout detection device according to claim 4, characterized in that: The four push rods (14) are evenly arranged on the side surface of the upper part of the circular ring member (17).

6. The radial runout detection device for a steam turbine rotor during hot running according to claim 1, wherein, A through-hole is formed in the base (1), and the lead screw (12) passes through the through-hole.

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