Adjustable combined air valve for tunnel ventilation

Abstract

The invention discloses an adjustable combined air valve for tunnel ventilation in the technical field of air valves for tunnels. The adjustable combined air valve comprises an air valve actuating mechanism, a rocker, a movement rod assembly and the like. The movement range of an air valve body is adjusted through the movement rod assembly so that the opening degree of the combined air valve can be steplessly adjusted and controlled, and the output air amount of an axial flow fan is changed, so that the switching adjustment of the ventilation amount of a short-term working condition and a long-term working condition is achieved; an external PLC controller can collect a 4-20 milliampere valve position feedback signal output by the air valve actuating mechanism to judge the opening degree ofthe air valve and the output air amount of the fan; only a soft starter needs to be adopted to control starting and stopping of the axial flow fan, and the opening degree of the combined air valve iscombined so that it can be ensured that the axial flow fan stably operates within the air amount range needed by the short-term working condition and the long-term working condition; and through themode, the air amount of the axial flow fan can be adjusted without a frequency converter, so that the frequency converter with a high working failure rate is replaced with the soft starter with a stable working state and the adjustable combined air valve.

Description

technical field [0001] The invention relates to the technical field of air valves for tunnels, and specifically relates to an adjustable combined air valve for tunnel ventilation. Background technique [0002] The combined air valve is an important part of the tunnel axial fan ventilation system. It is generally installed on the air inlet side of the axial fan to open and close the ventilation path. Smoke and fire resistance, the combined air valve can reduce the equipment wear caused by the idling of the axial flow fan with the natural wind when the fan is stopped, and the adverse effect of the induced current caused by the idling of the fan impeller on the performance of the motor, prolonging the working life of the fan system. Improve the reliability of the axial flow fan ventilation system and ensure the safety of the system. In the construction of highway tunnel ventilation projects, in order to avoid repeated investment, the long-term air volume is usually used to sel...

AI Technical Summary

Problems solved by technology

However, in the actual operation of the road tunnel, since the frequency converter is a continuous online operation device that requires continuous cooling by the fan, it has high requirements for environmental cleanliness, temperature and humidity, etc. Any software or hardware failure of the frequency converter will cause the entire axial flow ventilation system Shutdown, the structure of the inverter is relatively complex, and there are many types of components, it is difficult to adapt to the site environment with high dust, high temperature and humidity, and the failure rate is high, which increases the cost of later operation and maintenance and personnel requirements

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