Structure capable of improving stability of underwater vehicle floating bag safety valve

Abstract

The invention relates to a structure capable of improving stability of an underwater vehicle floating bag safety valve. The structure comprises a valve body, a valve rod and a guide sleeve. The valvebody is in a cylinder shape, one end of the outer surface of the cylinder is provided with a mounting thread, and the other end of the outer surface of the cylinder is provided with a sealing-fit face. Four guide rails are designed in the valve body and are each in a cross shape. The height of the guide rails is larger than the maximum distance of the valve rod moving in the safety valve, and thefit dimension tolerance of the guide rails and the valve rod is H9. The valve rod is in a stepped cylinder shape, in order to ensure that the valve rod is not clamped into the guide rails of the valvebody 1, the height of the fit cylindrical section of the valve rod and the guide rails is larger than one half of the height of the guide rails, and the fit tolerance is c9. The mandrel diameter of mounting springs of the valve rod is smaller than the inner diameter of springs by 0.1 mm, and the deviation of the directions between elastic force of the springs and force, acting on the valve rod, of gas is reduced. The diameter of guide holes in the guide sleeve is larger than the diameter of a thin shaft of the valve rod by 3 mm, and it is ensured that the valve rod does not collide with the guide holes during moving; and meanwhile, the mandrel inner diameter of the mounting springs is smaller than the inner diameter of the springs by 0.6 mm, and thus the problems that due to assembly errors, mandrels of the mounting springs of the valve rod and the guide sleeve are not coaxial, thus the springs deviate, and performance of the safety valve is influenced are solved.

Description

technical field [0001] The invention relates to a safety valve for a floating bag of an underwater vehicle, which can significantly improve the reliability, safety and security of the safety valve, and in particular relates to a structure for improving the working stability of the safety valve of the floating bag of an underwater vehicle. Background technique [0002] The existing safety valve for the floating bag of the underwater vehicle has the problem of poor working stability. When the valve stem moves in the valve body, it is easy to collide with the through hole of the guide sleeve to generate friction force, which is superimposed on the spring force, and then Affect the opening and closing pressure of the safety valve; at the same time, when the valve stem moves in the valve body, when the spring, guide sleeve and valve stem are assembled with each other, due to the dimensional tolerance and assembly tolerance, the assembly axes of the three will not coincide, and ass...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is: in order to solve the problem of poor working stability of the existing safety valve, the present invention proposes a structure for improving the working stability of the floating bag safety valve of the underwater vehicle

Images