Axial flow fan for nuclear power station containment continuous ventilation system

Abstract

The invention relates to a high pressure axial flow fan applied to various high pressure axial flow ventilation system, particularly relates to an axial flow fan for a nuclear power station containment continuous ventilation system, and belongs to the technical field of axial flow fans. The fan comprises a fairing, an impeller and an inner barrel assembly which are arranged in a casing sequentially in the air flow moving direction. The casing is composed of a collector, a fan outer barrel and a diffuser which are sequentially arranged in the air flow moving direction. The fairing is fixedly connected with the collector through a front inlet guide vane. The inner barrel assembly comprises a motor installed in a barrel body, the impeller is installed on an output shaft of the motor, and the outer wall of the barrel body is fixedly connected with the fan outer barrel through the guide vane. The axial flow fan has the advantages of being high in efficiency, saving energy, being low in noise and high in stability and the like.

Description

technical field [0001] The invention relates to a high-pressure axial-flow fan, which is applied to various high-pressure axial-flow ventilation systems, and more specifically relates to an axial-flow fan for a nuclear power plant containment continuous ventilation system, which belongs to the technical field of axial-flow fans. Background technique [0002] Nuclear energy has become an important energy source used by human beings, and nuclear power is one of the important ways to solve energy shortage and environmental problems in our country. The development of nuclear power is an inevitable strategic choice for our country, but nuclear safety is the soul and core of the entire nuclear industry. Especially affected by the Fukushima nuclear leakage accident in Japan, national leaders and the National Nuclear Safety Administration put nuclear safety at the forefront of nuclear culture. As the last barrier in nuclear power plants to prevent the release of fission prod...

AI Technical Summary

Problems solved by technology

However, the large axial flow fans currently on the market cannot meet the performance requirements of large flow and high static pressure in the continuous ventilation system of the containment of nuclear power plants.

Regardless of whether it is the aluminum alloy die-casting hub and blades commonly used in large axial flow fans, or the steel hub and blades, their strength and performance are far from meeting the requirements of the containment ventilation system.

Moreover, due to the defects in the structure, when using the Huff type hub and the blade to clamp, the torque on each bolt will be uneven, so that the axial movement of the blade and the hub will be relatively large, and it is difficult to control the relationship between the blade and the fan. Radial clearance; when the flanged hub and the blade are clamped, because the mounting surface of the hub is a circular arc, and the surface of the bolt fastener that matches it is a plane, the hub and the bolt fastener will contact in the form of points or lines Cooperate, the connection strength of the bolt cannot be guaranteed

However, when the fan is continuously running at high speed, it is subjected to huge centrifugal force, and if the connection strength between the blade and the hub cannot be guaranteed, it is prone to safety hazards

Once a safety accident occurs, the consequences will be disastrous

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