Anti-siphon structure for water inlet valve

Abstract

The invention discloses an anti-siphon structure for a water inlet valve. The anti-siphon structure comprises an inner core pipe, a water inlet pipe, a waterstop mechanism, a sealing gasket and a sealing socket, an air inlet hole is formed in the sealing socket, the sealing socket and the sealing gasket are arranged in a matched manner, the inner core pipe is sleeved in the water inlet pipe, a water inlet channel is formed in the inner core pipe, the waterstop mechanism controls a water outlet of the water inlet channel to open or close, a water outlet channel is formed between the inner core pipe and the water inlet pipe, and a fitting surface is formed on the inner core pipe. When water enters, a water inlet of the inner core pipe is separated from the waterstop mechanism and opened, the sealing gasket and the fitting surface are opened, the air inlet hole in the sealing socket is plugged, so that a transitional channel is formed, and the water inlet channel is communicated with the water outlet channel by the transitional channel. When the water stops entering, the water inlet of the inner core pipe is plugged by the waterstop mechanism and closed, the sealing gasket returns and is fitted with the fitting surface, and an airflow channel is formed between the sealing gasket and the fitting surface. The anti-siphon structure is simple, fine in anti-siphon effect and accurate in CL (center line) marking.

Description

technical field [0001] The invention relates to a water inlet valve, in particular to an anti-siphon structure of the water inlet valve. Background technique [0002] In the prior art, the water inlet valve includes an inner core pipe, a water inlet pipe body, a water stop mechanism, a sealing gasket and a sealing seat; In the water pipe body, a water inlet channel is set in the inner core tube, and the water outlet of the water inlet channel is opened or closed by the water stop mechanism; a water outlet channel is set between the inner core tube and the water inlet pipe body; a sticker is formed on the inner core tube Joint surface, in the state of water intake, the water inlet of the inner core tube is separated from the water stop mechanism, the gasket and the joint surface are opened and the air intake hole on the sealing seat is blocked, thereby forming a transition channel, which will enter The water channel is connected to the water outlet channel, and the water flo...

AI Technical Summary

Problems solved by technology

[0004] When the water is suddenly cut off, a large negative pressure is formed in the inner core tube, and the water inlet of the inner core tube is blocked and closed by the water stop mechanism. The water outlet channel is cut off to play an anti-siphon effect, however, its anti-siphon effect is still not ideal

[0005] At the same time, when the water inlet valve needs to be marked with the CL line (anti-siphon line) when it leaves the factory, it is usually necessary to conduct a destructive test on the gasket of the water inlet valve, such as placing a steel wire between the gasket and the fitting surface, so as to determine the test. The position of the CL line is marked on the body of the water inlet valve, but the size and shape of the steel wire between the gasket and the fitting surface are different, which easily causes a large error in the labeling of the CL line, which in turn causes a large error in the installation of the water inlet valve. It is easy to produce siphon phenomenon and pollute the water source

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