Tower drum doorframe gradually varied in thickness

Abstract

The invention relates to a tower drum doorframe gradually varied in thickness. The tower drum doorframe gradually varied in thickness is shaped through integrated forging or casting, of a ring structure, and formed by sequentially connecting the doorframe upper end, the doorframe lower end and the arc doorframe middle together, and a smooth transition is adopted among the doorframe upper end, the doorframe lower end and the doorframe middle. The outer side wall of the tower drum doorframe gradually varied in thickness is connected with the side wall of a tower drum door opening. The outer wall of the tower drum doorframe gradually varied in thickness is of the same radian as the outer wall of a tower drum, and another smooth transition is adopted between the inner wall of the tower drum doorframe gradually varied in thickness and the inner wall of the tower drum. The thickness of the inner side wall of the tower drum doorframe is larger than the thickness of the outer side wall of the tower drum doorframe, and the tower drum doorframe gradually varied in thickness and the walls of the tower drum are connected through full penetration butt welding seams. Compared with annular reinforced doorframes usually used at present, the full penetration butt welding seams are used to connect the tower drum doorframe gradually varied in thickness with the walls of tower drum, stress concentration on the connecting welding seams is reduced, fatigue stress amplitude of the welding seams is reduced, fatigue resistance of the welding seams after being ground flush is high, and simultaneously the tower drum doorframe gradually varied in thickness can prevent the walls of the tower drum at the bottom of the tower drum doorframe gradually varied in thickness from being thickened, reduces welding quantity and welding deformation of the welding seams between the walls of the bottom tower drum, among the walls of the tower drum and the tower drum doorframe gradually varied in thickness, and among the walls of the tower drum and a flange at the bottom of the tower drum, improves economical efficiency of the tower drum, and reduces transportation difficulty. The tower drum doorframe gradually varied in thickness nearly has no effect on low order self-vibration characteristics of a wind turbine generator tower.

Description

technical field [0001] The invention belongs to the technical field of wind power generation tower tube structures, and in particular relates to a door frame of a tower tube with gradually changing thickness. Background technique [0002] Wind power towers usually have a tower structure 1, the bottom of which is connected to the foundation 2, and the top is equipped with a generator 3 and a wind wheel 4. Inside the tower, there are ladders for up and down traffic and cables for power transmission, so the bottom of the tower needs to be opened for installation door opening 5. The tower tube 1 is affected by the weakening of the opening and often needs to be strengthened by reinforcement measures. Commonly, the tower tube 1 is reinforced with an annular stiffener 6, and the annular stiffener 6 and the tube wall are connected 8 by a full penetration T-shaped weld. Due to the large stress concentration and low allowable fatigue stress range at the 8 T-shaped welds, it is usua...

AI Technical Summary

Problems solved by technology

[0003] The ring stiffening plate 6 and the measures of thickening the bottom wall of the bottom tower greatly increase the weight of the bottom tower, which increases the difficulty of hoisting the tower 1, and the economy is poor; Welding seam 10, welding seam 8 between the cylinder wall and the annular stiffening plate, and welding seam 9 between the cylinder wall and the bottom flange have greatly increased the welding volume, so the welding heat and welding deformation caused by the increase increase the difficulty of welding deformation control

Moreover, the transition slope 11 set between the thicker wall in the area of ​​the door opening 5 and the thinner wall in the upper part is also difficult to completely avoid the stress concentration here, causing structural damage to easily occur here

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