Connecting structure capable of self-adjusting fastening force for air cylinder split

Abstract

The invention discloses a connecting structure capable of self-adjusting fastening force for an air cylinder split. The connecting structure comprises a connecting wedge block and a corresponding aircylinder connecting hole structure, and is characterized in that the connecting wedge block is a concave hexagon conical tensile body, is constituted by an assembly section, a transition section and afastening section, and has a certain cone angle and a non-parallel structure, and thus fastening faces and non-fastening faces are formed. The connecting structure adopts a conical wedge block mode to replace a traditional bolt connection mode, can be applied to be connected with the smooth section (the non-corner position) of the air cylinder split, and is simple in structure and convenient to mount and demount, required prestress is small, additional heating auxiliary equipment does not need to be provided in the mounting and demounting processes of the connecting structure, and the time ofthe mounting and demounting processes of the splits of an upper air cylinder and a lower air cylinder is greatly shortened; compared with a bolt, the bearing face of the connecting wedge block is larger, and creep can be slowed down; and meanwhile, through the conical wedge block structure, pressure distribution of a contact section is optimized, the self-adjusting process is formed, and air tightness when the air cylinders are connected at the smooth section can be improved.

Description

【Technical field】 [0001] The invention belongs to the field of face sealing in steam turbines and gas turbines, and relates to a connection structure for face self-adjusting fastening force in a cylinder. 【Background technique】 [0002] Steam turbine and gas turbine cylinder The outer cylinder is the largest and most complex steel casting in steam turbines and gas turbines. It is generally divided into upper and lower half cylinders, and the horizontal joint surface is called the midsection. During the operation of steam turbines and gas turbines, it is necessary to maintain the sealing of the split surface, and its sealing performance not only determines the safety of the unit, but also affects the operating efficiency of the entire unit. [0003] In current steam turbines and gas turbines, the facets in the cylinder are usually connected by bolts. Due to the large size of the bolts, the bolts need to be heated during the assembly and disassembly of the bolts. According to...

AI Technical Summary

Problems solved by technology

According to engineering experience, the heating process of a single bolt is generally about 10-20 minutes, and it usually takes more than 4 hours to heat the whole bolt of a single cylinder; at the same time, the bolt is very easy to be worn during the fastening process. There are very strict requirements on the pre-tightening force, and there is a problem that the cylinder is deformed due to uneven tightening of bolts

[0004] To sum up, since the process of bolt connection is very complicated and time-consuming, it is necessary to propose a connection structure with facet self-adjusting fastening force in the cylinder.

Images