Anti-water-inflow gravity self-closing valve for vacuum drainage system

Abstract

The invention discloses an anti-water-inflow gravity self-closing valve for a vacuum drainage system. The anti-water-inflow gravity self-closing valve comprises a base and a valve body, wherein the bottom of the valve body is connected with a containing bottle, the containing bottle is provided with a first air inlet hole and an air outlet hole, a second air inlet hole is formed in the inner wall of an air inlet sealing cavity, the second air inlet hole communicates with the air outlet hole, and a sliding groove is formed in the valve body; a blocking piece is slidably connected into the sliding groove, the sliding groove is connected with the air outlet hole, the valve body is vertically placed, and the blocking piece seals the air outlet hole; and the valve body is rotationally arranged on the base, a limiting unit is arranged between the valve body and the base and comprises a limiting piece and a groove, the limiting piece and the groove are arranged / formed on / in the valve body and the base respectively, the limiting piece comprises a spring and a ball, the ball enters the groove, and relative rotation of the valve body and the base can be limited through friction force between the ball and the groove. The anti-water-inflow gravity self-closing valve can prevent sewage from being sucked into a control valve to damage the control valve when an interface valve diaphragm is broken.

Description

technical field [0001] The invention relates to the technical field of control valves, in particular to a water-ingress-proof gravity self-closing valve used in a vacuum drainage system. Background technique [0002] The vacuum drainage system is mainly composed of sanitary ware, lifter, sewage tank, vacuum pump, sewage pump, vacuum sewage pipeline, interface valve and control system. The interface valve is set between the lifter and the sewage tank, and is connected through a vacuum sewage pipeline. The vacuum pump keeps the negative pressure in the sewage tank within a certain range, and the sanitary solution sewage flows into the lifter through the gravity pipeline. When the water depth in the lifter reaches 2 / 3 When the liquid level is high, the interface valve is controlled by the liquid level detection system of the lifter, and the interface valve is opened by the control valve, and the sewage in the lifter is sucked to the sewage tank. As the core component of the w...

AI Technical Summary

Problems solved by technology

As the core component of the whole system, the interface valve is generally used in the industry to make diaphragms made of rubber-like flexible materials. The negative pressure of the sewage tank is used as the power, and the control valve is used as the negative pressure switch control. For foreign objects such as sand and pebbles, after a certain period of time, the diaphragm will be worn to varying degrees, even perforated and broken. At this time, the sewage will be sucked into the control valve through the diaphragm, causing irreparable damage to the control valve. Damage to adjacent control valves even via vacuum power lines

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