Vent shut-off valve

Abstract

Provided is a vent cut-off valve, comprising a valve body (1) and a valve cover (2), the valve body (1) comprising a casing (8) with a partition wall (4) inside and a ventilator located above the partition wall (4). Valve (5), the cut-off valve (6) positioned at the bottom of the partition wall (4), the partition wall (4) offers a fluid channel hole (7), the bottom is provided with a floating core (9), and the top of the floating core (9) is in contact with the partition wall ( 4) There is a sealing mechanism between them, the sealing mechanism includes a sealing seat (13) and a rubber sealing sheet (14) installed on the floating core (9), an arc boss (15) is arranged on the floating core (9), the sealing seat (13) The corresponding arc recesses (16) for inserting the arc bosses (15) are provided below, so that the sealing seat (13) can flexibly swing in any direction, and the rubber sealing sheet (14) passes through the fixing buckle (27) Installed on the sealing seat (13), a small gap (19) is provided on the upper convex ring (18) of the partition wall (4); the sealing performance and stability are improved, and the pressure maintaining performance of the pressure maintaining mechanism is better.

Description

technical field [0001] The invention relates to a ventilation cut-off valve, which is usually installed on or connected with the fuel tank of the automobile when in use, its inlet communicates with the fuel tank, and its outlet leads to a waste gas recovery device such as a carbon tank. Under normal circumstances, the breathing function inside and outside the fuel tank is realized, and the air pressure balance between the inner cavity of the fuel tank and the outside atmosphere is maintained; under abnormal conditions, the oil circuit is cut off to prevent fuel from leaking out. Background technique [0002] A vent cut-off valve is usually installed on the fuel tank of the vehicle. This kind of vent shut-off valve is often installed on the fuel tank of the car when it is used. The valve body extends into the fuel tank. The inlet of the valve is located under or around the valve body, or the valve is connected to the fuel tank of the car; The outlet of the valve is located on...

AI Technical Summary

Problems solved by technology

The movement stability of the breather valve is also insufficient, especially, the movement stability of the cut-off valve of the breather cut-off valve described in these examples is not enough when it is closed, and the seals are prone to offset from each other, resulting in a small amount of fuel leakage; As we all know, vehicles need to be used in different geographical environments and seasonal climate conditions, and the air pressure in the fuel tank varies greatly. Even under the same geographical environment and seasonal climatic conditions, the air pressure in the fuel tank will change greatly when used; The structural schemes of the sealing mechanism and the pressure-holding mechanism of the ventilation shut-off valve described in these examples need to be further rationalized and improved to further enhance the reliability of the sealing mechanism and the pressure-holding mechanism, so that the sealing performance of the sealing mechanism is comparable to that of the pressure-holding mechanism. Better pressure holding performance

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