Pulling device for diffuser of steam turbine

Abstract

The utility model discloses a pulling device for a diffuser of a steam turbine, and belongs to the field of machining and assembling. A pulling device for a diffuser of a steam turbine comprises a bottom support, a long screw, a pressing plate, a positioning guide ring and supporting plates, the bottom support is provided with a positioning spigot matched with an inner hole of the diffuser, a first screw hole is formed in the center of the bottom support, the two sides of the positioning guide ring are connected with the supporting plates respectively, the long screw penetrates through the positioning guide ring, and the long screw penetrates through the pressing plate. The two ends of the pressing plate are connected with the first screw hole of the bottom support and the pressing plate respectively, and a jack is arranged below the pressing plate. An old diffuser can be directly replaced on an overhaul site, the pulling process is stable and rapid, a cylinder cannot be damaged, and the requirement is met when a new diffuser and the cylinder are assembled.

Description

Technical Field

[0001] The utility model relates to the field of mechanical processing and assembly, in particular to a steam turbine diffuser extraction device. Background Art

[0002] At present, when overhauling a steam turbine, problems such as diffuser damage and poor contact between the diffuser and the cylinder may occur. To ensure the safe operation of the steam turbine, the diffuser needs to be replaced. However, due to the interference fit between the diffuser and the cylinder and the limited maintenance site, it is difficult to extract it. In addition, the existing extraction tooling cannot locate the diffuser and the extraction strength is insufficient. The extraction process often causes the diffuser to get stuck, so the cylinder can only be returned to the factory and the diffuser to be replaced can only be removed by boring, which greatly increases the maintenance cost and construction period. Therefore, there is an urgent need for a tooling that can easily extract the steam turbine diffuser. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a device for extracting a diffuser from a turbine cylinder. By using the device, the old diffuser can be directly extracted at the maintenance site, the diffuser can be accurately positioned, and the cylinder will not be damaged during the extraction process, which greatly improves work efficiency.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] A steam turbine diffuser extraction device comprises a base, a long screw, a pressure plate, a positioning guide ring and a support plate. The base is provided with a positioning stop matched with the inner hole of the diffuser, a first screw hole is provided at the center of the base, both sides of the positioning guide ring are respectively connected with the support plate, the long screw passes through the positioning guide ring, and its two ends are respectively connected with the first screw hole of the base and the pressure plate, and a jack is provided under the pressure plate.

[0006] A further technical solution is that a through hole is provided at the center of the positioning guide ring, and second screw holes are provided on both sides of the through hole, and the positioning guide ring is connected to the support plate by the cooperation of the bolts, the second screw holes, and the mounting holes of the support plate. The positioning guide ring ensures that the long screw is centered and vertical through the inner hole of the cylinder and the guidance of the positioning column of the long screw. During the upward movement of the jack, the force during the pulling process is ensured to be uniform through the role of guidance, and the cylinder will not be damaged, thereby improving the extraction efficiency of the diffuser.

[0007] According to a further technical solution, the diameter of the through hole is slightly larger than the diameter of the positioning column of the long screw, so that the long screw can pass through the through hole easily.

[0008] According to a further technical solution, the gap between the through hole of the positioning guide ring and the positioning column of the long screw is 0.1 to 0.15 mm.

[0009] According to a further technical solution, the gap between the outer circumferential surface of the positioning guide ring and the cylinder is 0.1 to 0.15 mm.

[0010] According to a further technical solution, there are two jacks symmetrically arranged below the pressure plate, so that the pressure plate can move upward more smoothly, so that the force is evenly applied when the diffuser is extracted.

[0011] According to a further technical solution, the device also includes a thickened nut, which cooperates with the long screw to lock the pressure plate and the base, thereby ensuring the tightness between the long screw and the pressure plate.

[0012] In a further technical solution, the gap between the positioning stop and the inner hole at the bottom of the diffuser is 0.1-0.15 mm. The positioning stop is matched according to the size of the inner hole at the bottom of the diffuser to control the gap and ensure that the bottom bracket is centered after being installed.

[0013] In a further technical solution, the long screw comprises a positioning post and threaded parts arranged on the upper and lower sides of the positioning post. The positioning post is cylindrical. The long screw is provided with the positioning post, and during the upward extraction of the diffuser, the force is evenly applied through the guiding effect between the positioning guide ring and the positioning post, and the cylinder is not damaged.

[0014] The working method of the utility model is as follows:

[0015] 1. First, place the base on the bottom of the diffuser to be replaced, so that the positioning stopper and the inner hole of the diffuser are positioned in coordination;

[0016] 2. Place the support plates on both sides of the positioning guide ring on the inner hole of the cylinder and lock them. Then pass the positioning column of the long screw through the through hole of the positioning guide ring. The bottom of the column is connected to the first screw hole of the bottom bracket. The top is locked with the pressure plate by matching with the thickened nut. Place the pressure plate on the two jacks.

[0017] 3. Start the jack and pull the old diffuser out of the cylinder by moving the pressure plate upward. Beneficial Effects

[0018] Compared with the prior art, the utility model has the following significant advantages:

[0019] 1. The utility model can directly replace the old diffuser at the maintenance site. The extraction process is smooth and fast, and the cylinder will not be damaged, so that the assembly of the new diffuser and the cylinder meets the requirements.

[0020] 2. The utility model has a simple structure, is easy to disassemble, is convenient and quick to use, and has high extraction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 This is the main view of the base;

[0023] Figure 3 It is a top view of the base;

[0024] Figure 4 It is a schematic diagram of the structure of a long screw;

[0025] Figure 5 It is a structural schematic diagram of the positioning guide ring;

[0026] Figure 6 is a structural schematic diagram of the support plate;

[0027] Markings in the figure: 1 base; 2 long screw; 3 positioning guide ring; 4 support plate; 5 bolt; 6 jack; 7 pressure plate; 8 thickened nut; 9 diffuser; 10 cylinder; 1-1 positioning stop; 1-2 first screw hole; 2-1 positioning column; 3-1 through hole; 3-2 second screw hole; 3-3 outer circumferential surface; 4-1 mounting hole. DETAILED DESCRIPTION

[0028] The utility model is described in detail below in conjunction with the embodiments and application examples. It should be pointed out that the embodiments are preferred implementations of the utility model, rather than limiting the scope of protection claimed for the utility model, and the application and use method of the utility model are not limited to the application examples. Example

[0029] like Figure 1-6 As shown, the steam turbine diffuser extraction device includes a base 1, a long screw 2, a pressure plate 7, a positioning guide ring 3 and a support plate 4. The base 1 is provided with a positioning stop 1-1 that matches the inner hole of the diffuser 9, and the center of the base 1 is provided with a first screw hole 1-2. Both sides of the positioning guide ring 3 are respectively connected to the support plate 4. The long screw 2 passes through the positioning guide ring 3, and its two ends are respectively connected to the first screw hole 1-2 of the base 1 and the pressure plate 7. A jack 6 is provided below the pressure plate 7.

[0030] The positioning guide ring 3 is provided with a through hole 3-1 at the center, and second screw holes 3-2 are provided on both sides of the through hole 3-1. The positioning guide ring 3 is connected to the support plate 4 by the cooperation of the bolt 5, the second screw hole 3-2, and the mounting hole 4-1 of the support plate. The positioning guide ring 3 ensures that the long screw 2 is centered and vertical through the inner hole of the cylinder and the guidance of the positioning column of the long screw 2. During the upward movement of the jack 6, the force during the pulling process is ensured to be uniform through the guidance, and the cylinder 10 will not be damaged, thereby improving the extraction efficiency of the diffuser 9.

[0031] The diameter of the through hole is slightly larger than the diameter of the positioning column of the long screw 2, so that the long screw 2 can pass through the through hole easily.

[0032] The gap between the through hole of the positioning guide ring 3 and the positioning column of the long screw 2 is 0.1-0.15 mm.

[0033] The gap between the outer circumferential surface 3 - 3 of the positioning guide ring 3 and the cylinder is 0.1 to 0.15 mm.

[0034] There are two jacks 6 symmetrically arranged below the pressing plate 7 , which can make the pressing plate 7 move upward more smoothly so that the force is evenly applied when the diffuser 9 is extracted.

[0035] The device also includes a thickened nut 8, which locks the pressing plate 7 and the bottom bracket 1 through the cooperation between the thickened nut 8 and the long screw rod 2, thereby ensuring the tightness between the long screw rod 2 and the pressing plate 7.

[0036] The gap between the positioning stop 1-1 and the inner hole at the bottom of the diffuser 9 is 0.1-0.15 mm. The positioning stop 1-1 is matched according to the size of the inner hole at the bottom of the diffuser 9 to control the gap and ensure that the base 1 is centered after being installed.

[0037] The long screw 2 includes a positioning column 2-1 and threaded parts 2-2 arranged on the upper and lower sides of the positioning column. The positioning column 2-1 is cylindrical. The long screw 2 is provided with a positioning column. During the upward extraction of the diffuser 9, the force is evenly applied through the guiding effect between the positioning guide ring 3 and the positioning column, and the cylinder 10 is not damaged.

[0038] The working method of the utility model is as follows:

[0039] 1. First, place the base on the bottom of the diffuser to be replaced, so that the positioning stopper and the inner hole of the diffuser are positioned in coordination;

[0040] 2. Place the support plates on both sides of the positioning guide ring on the inner hole of the cylinder and lock them. Then pass the positioning column of the long screw through the through hole of the positioning guide ring. The bottom of the column is connected to the first screw hole of the bottom bracket. The top is locked with the pressure plate by matching with the thickened nut. Place the pressure plate on the two jacks.

[0041] 3. Start the jack and pull the old diffuser out of the cylinder by moving the pressure plate upward.

Claims

1. Steam turbine diffuser extraction device, including base, long screw, and pressing plate, Features: It also includes a positioning guide ring and a support plate. The base is provided with a positioning stop that matches the inner hole of the diffuser. A first screw hole is provided at the center of the base. Both sides of the positioning guide ring are respectively connected to the support plates. The long screw passes through the positioning guide ring, and its two ends are respectively connected to the first screw hole of the base and the pressure plate. A jack is provided under the pressure plate.

2. The steam turbine diffuser extraction device according to claim 1, Features: A through hole is provided at the center of the positioning guide ring, and second screw holes are respectively provided on both sides of the through hole. The positioning guide ring is connected to the support plate through the cooperation of bolts and the second screw holes.

3. The steam turbine diffuser extraction device according to claim 2, Features: The diameter of the through hole is slightly larger than the diameter of the positioning column of the long screw.

4. The steam turbine diffuser extraction device according to claim 2 or 3, Features: The gap between the through hole of the positioning guide ring and the positioning column of the long screw is 0.1-0.15 mm.

5. The steam turbine diffuser extraction device according to claim 1, Features: The gap between the outer circumferential surface of the positioning guide ring and the inner hole of the cylinder top is 0.1-0.15 mm.

6. The steam turbine diffuser extraction device according to claim 1, Features: There are two jacks, which are symmetrically arranged below the pressure plate.

7. The steam turbine diffuser extraction device according to claim 1, Features: It also includes a thickened nut, which is used to lock the pressure plate and the bottom bracket through the cooperation of the thickened nut and the long screw.

8. The steam turbine diffuser extraction device according to claim 1, Features: The gap between the positioning stop and the inner hole at the bottom of the diffuser is 0.1-0.15 mm.

9. The steam turbine diffuser extraction device according to claim 1, Features: The long screw comprises a positioning column and threaded parts arranged on the upper and lower sides of the positioning column.

10. The steam turbine diffuser extraction device according to claim 9, Features: The positioning column is cylindrical.

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