Supporting structure for main shaft of power station steam turbine

Abstract

The supporting structure comprises an upper supporting vertical plate, a bottom semicircular pull ring, two screw rods and two nuts, a semicircular notch is formed in the center of the bottom face of the upper supporting vertical plate, through holes are vertically formed in the two sides of the semicircular notch, screw holes are formed in the two end faces of the bottom semicircular pull ring respectively, and the two screw rods and the two nuts are connected through the screw holes. The bottom ends of the two screw rods are respectively screwed in the screw holes in the two end surfaces of the bottom semicircular pull ring and penetrate through the through holes of the upper supporting vertical plate; and the two nuts are screwed at the top ends of the two screw rods. The supporting structure overcomes the defects of a traditional main shaft support, eliminates the deformation risk of the steam turbine main shaft, ensures the stability and reliability of the steam turbine main shaft support, avoids long-time occupation of mechanical equipment, and improves the overhaul operation efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment maintenance, in particular to a support structure for the main shaft of a power station steam turbine. Background Art

[0002] The main shaft of a steam turbine is one of the core components of a steam turbine, mainly used to transmit the power generated by the steam turbine to the generator, so as to achieve the conversion of electrical energy. The main bearing of the steam turbine bears the torque required for the generator to rotate and is an indispensable part of the steam turbine. Its function is not only to transmit power, but also to ensure the stable and efficient operation of the steam turbine. At the same time, the composition requirements of the main shaft are relatively high, and it must have the characteristics of high strength, high precision and high stiffness.

[0003] The main shaft of a steam turbine has complex dynamic characteristics during operation, including phenomena such as vibration and deformation. Therefore, the quality and performance of the main shaft directly affect the working efficiency and safety of the steam turbine.

[0004] During the daily disassembly and overhaul of the steam turbine bearing bush, in order to prevent the local bending deformation of the main shaft of the steam turbine caused by the long-term suspension of the main shaft without support. At present, the main support methods for the main shaft of the steam turbine during the overhaul operation are mainly two methods: jacking support and hoisting suspension by a crane. Among them, using a jack to support the bottom of the main shaft, this method has certain defects. For example, the jack is prone to slip off from the main shaft or the internal seal of the jack is poor, resulting in the leakage of hydraulic oil and unloading, so that the stability of the main shaft support force cannot be guaranteed. Hoisting the main shaft by a crane requires the crane to always maintain the same position, which not only occupies the crane for a long time, but also affects the subsequent process's demand for the crane and affects the entire overhaul cycle. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a support structure for the main shaft of a power station steam turbine. This support structure overcomes the defects of the traditional main shaft support, eliminates the deformation risk of the main shaft of the steam turbine, ensures the stability and reliability of the support of the main shaft of the steam turbine, avoids the long-term occupation of mechanical equipment, and improves the efficiency of the overhaul operation.

[0006] To solve the above technical problem, the support structure for the main shaft of a power station steam turbine of the utility model includes an upper support vertical plate, a bottom semi-circular pull ring, two screw rods and two nuts. The bottom surface of the upper support vertical plate is centered with a semi-circular notch, and through holes are vertically arranged on both sides of the semi-circular notch. The two end faces of the bottom semi-circular pull ring are respectively provided with screw holes. The bottom ends of the two screw rods are respectively screwed into the screw holes on the two end faces of the bottom semi-circular pull ring and pass through the through holes of the upper support vertical plate, and the two nuts are screwed onto the top ends of the two screw rods.

[0007] Furthermore, support seats are provided on both sides of the upper support vertical plate flush with the bottom surface.

[0008] Furthermore, the diameters of the semi-circular notch on the bottom surface of the upper support vertical plate and the bottom semi-circular pull ring match the diameter of the steam turbine main shaft.

[0009] Furthermore, the cross-section of the bottom semi-circular pull ring is rectangular.

[0010] Since the support structure for the steam turbine main shaft of the present utility model adopts the above technical solution, that is, this support structure includes an upper support vertical plate, a bottom semi-circular pull ring, two screw rods and two nuts. The upper support vertical plate is provided with a semi-circular notch in the center of the bottom surface, and through holes are vertically provided on both sides of the semi-circular notch. The two end faces of the bottom semi-circular pull ring are respectively provided with screw holes. The bottom ends of the two screw rods are respectively screwed into the screw holes on the two end faces of the bottom semi-circular pull ring and pass through the through holes of the upper support vertical plate. The two nuts are screwed onto the top ends of the two screw rods. This support structure overcomes the defects of traditional main shaft supports, eliminates the risk of deformation of the steam turbine main shaft, ensures the stability and reliability of the steam turbine main shaft support, avoids the long-term occupation of mechanical equipment, and improves the maintenance operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following further describes the present utility model in detail in conjunction with the drawings and embodiments:

[0012] Figure 1 It is a schematic diagram of the support structure for the steam turbine main shaft of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] For example Figure 1 As shown, the support structure for the steam turbine main shaft of the present utility model includes an upper support vertical plate 1, a bottom semi-circular pull ring 2, two screw rods 3 and two nuts 4. The upper support vertical plate 1 is provided with a semi-circular notch 11 in the center of the bottom surface, and through holes 12 are vertically provided on both sides of the semi-circular notch 11. The two end faces of the bottom semi-circular pull ring 2 are respectively provided with screw holes. The bottom ends of the two screw rods 3 are respectively screwed into the screw holes on the two end faces of the bottom semi-circular pull ring 2 and pass through the through holes 12 of the upper support vertical plate 1. The two nuts 4 are screwed onto the top ends of the two screw rods 3.

[0014] Preferably, support seats 13 are provided flush with the bottom surface at both end portions of the upper support vertical plate 1. The support seats 13 facilitate the placement of both end portions of the upper support vertical plate 1 on the steam turbine bearing housing, ensuring the stability of the upper support vertical plate 1.

[0015] Preferably, the diameters of the semi-circular notch 11 on the bottom surface of the upper support vertical plate 1 and the bottom semi-circular pull ring 2 match the diameter of the steam turbine main shaft 5.

[0016] Preferably, the cross-section of the bottom semi-circular pull ring 2 is rectangular. The rectangular cross-section facilitates the setting of the screw holes on the two end faces of the bottom semi-circular pull ring.

[0017] When disassembling and overhauling the steam turbine bearing bush, first remove the outer housing of the steam turbine bearing bush, disassemble the steam turbine bearing bush and lift out the upper bearing pad. Install the bottom semi-circular pull ring 2 at the bottom of the steam turbine main shaft 5, screw two screws 3 into the screw holes at the two end faces of the bottom semi-circular pull ring 2 respectively, install the upper support vertical plate 1 on the upper part of the steam turbine main shaft 5, and place the two end parts on both sides of the upper support vertical plate 1 on the steam turbine bearing bush box body. The two screws 3 pass through the through holes 12 of the upper support vertical plate 1, and connect the upper support vertical plate 1 and the bottom semi-circular pull ring 2 together and pre-tighten them through the nut 4. Install a hydraulic jack at the bottom of the steam turbine main shaft 5 and pressurize it until the pressure gauge at the outlet of the hydraulic jack starts to show pressure. Install dial indicators on both sides of the steam turbine main shaft, then pressurize the hydraulic jack and monitor the dial indicators until the main shaft is lifted by 0.50 mm. Finally, lock the nut 4 to complete the support operation of the steam turbine main shaft, and then the operation of turning out the lower bearing pad of the steam turbine main shaft can be carried out to realize the disassembly and overhaul of the steam turbine bearing bush.

[0018] This support structure suspends the main shaft through the upper support vertical plate and the bottom semi-circular pull ring, improves the stability of the main shaft support, avoids the long-term occupation of the overhead traveling equipment, and the main shaft will not fall off or be over-supported during the support process, avoiding the deformation of the main shaft during the support process, and improving the efficiency and quality of the overhaul operation.

Claims

1. A support structure for a main shaft of a steam turbine in a power station, characterized in that: It includes an upper supporting plate, a bottom semicircular pull ring, two screw rods and two nuts. A semicircular notch is provided in the center of the bottom surface of the upper supporting plate, and through holes are vertically provided on both sides of the semicircular notch. Screw holes are respectively provided on the two end surfaces of the bottom semicircular pull ring. The bottom ends of the two screw rods are respectively screwed into the screw holes on the two end surfaces of the bottom semicircular pull ring and pass through the through holes of the upper supporting plate. The two nuts are screwed on the top ends of the two screw rods.

2. The supporting structure for the main shaft of a steam turbine in a power station according to claim 1, characterized in that: The end portions of both sides of the upper supporting vertical plate are flush with the bottom surface and provided with supporting seats.

3. The supporting structure for the main shaft of a steam turbine in a power station according to claim 1 or 2, characterized in that: The diameters of the semicircular notch on the bottom surface of the upper supporting vertical plate and the semicircular pull ring at the bottom match the diameter of the main shaft of the steam turbine.

4. The supporting structure for the main shaft of a steam turbine in a power station according to claim 3, characterized in that: The cross section of the bottom semicircular pull ring is rectangular.

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