Directly buried antifreeze compound intake and exhaust valve

Abstract

The invention discloses a direct-buried antifreeze type composite intake and exhaust valve, which comprises a protective tube, the outer wall of the protective tube is wrapped with a thermal insulation layer of the protective tube, an intake and exhaust thermal insulation mechanism is fixedly connected inside the protective tube, and a maintenance valve and an air valve are connected. The space is also fixedly connected with socket quick joints; the intake and exhaust heat preservation mechanism includes a fixed heat preservation layer fixedly connected with the protective tube and a movable heat preservation layer that can move up and down. When there is no pressure difference between the inside and outside of the protective cylinder, it is sealed and matched with the fixed insulation layer. The air intake and exhaust heat preservation mechanism can allow air to enter and exit during intake and exhaust, and keep it completely closed to prevent low-temperature air from entering when it is not intake and exhaust; on the other hand, the socket quick joint can avoid manual downhole installation and reduce the size of the required protective tube , which is not only convenient for installation and maintenance, but also reduces the heat transfer area between the protective tube and the outside world, and further improves the heat preservation effect of the air valve.

Description

technical field [0001] The invention relates to the technical field of valve heat preservation, in particular to a direct-buried anti-freezing compound intake and exhaust valve. Background technique [0002] Intake and exhaust valves are widely used in various water pipelines, which play a role in safety protection, energy saving and consumption reduction of pipelines, and are key equipment on water pipelines. The traditional composite intake and exhaust valves are generally installed in the valve well. The construction cost of the valve is relatively high and the floor space is relatively large. The valve well needs to be waterproofed. If the composite intake and exhaust valve is used on pipelines in severe cold areas, it needs Insulate the valve well. [0003] However, as shown in Chinese patent CN209114506U, the inner cavity of the valve well is generally directly connected to the atmosphere through the vent pipe, which is convenient for the air in the pipe to be dischar...

AI Technical Summary

Problems solved by technology

On the one hand, this structure has a large air flow resistance, which is not conducive to rapid air intake and exhaust, and it is easy to form a pressure difference. On the other hand, when the air is exhausted and the airflow is stable, the low-temperature air outside the valve well will still enter through the gap between the baffles on both sides. Valve pit cooling air valve

Images