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Ventilation stop valve

A technology for cut-off valves and bonnets, applied in safety valves, balance valves, valve devices, etc., can solve problems such as huge gaps in air pressure changes, mutual offset of seals, and insufficient operational stability, to improve sealing performance and motion Stability, reduced suction, easy re-opening effect

Inactive Publication Date: 2017-06-09
慈溪市华龙电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

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Embodiment Construction

[0044] the following to Figure 1 to Figure 26 The specific embodiments of the present invention are shown in detail.

[0045] A vent shut-off valve, such as figure 1 As shown, it includes a valve body 1 and a valve cover 2 , the valve cover 2 is provided with an external port 3 as a fluid passage port, and the valve body 1 is located below the valve cover 2 .

[0046] Such as figure 2 As shown, the valve body 1 includes a housing 8, a vent valve 5 and a shut-off valve 6 arranged inside the housing 8, a partition wall 4 is arranged inside the housing 8, and a vent valve 5 is arranged above the partition wall 4 of the housing 8 to isolate A cut-off valve 6 is arranged below the wall 4, and a fluid passage hole 7 is provided in the partition wall 4, see Figure 10 , Figure 11 , Figure 12 is more clear. The valve cover 2 covers the upper part of the housing 8 and is fixedly connected with the valve cover 2. A floating core 9 which can move up and down along the inner wal...

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Abstract

The invention provides a ventilation stop valve. The ventilation stop valve comprises a valve body (1) and a valve cover (2); the valve body (1) includes a shell (8) provided with an isolation wall (4) inside, a ventilation valve (5) positioned above the isolation wall (4), and a stop valve (6) positioned below the isolation wall (4); the ventilation valve (5) includes a pressure maintaining base (30), a pressure maintaining cover (31), an umbrella-shaped rubber piece (32) and a pressure maintaining spring (33); an upper convex ring (18) is arranged on the isolation wall (4), and is provided with a small gap (19); the ventilation valve includes an independent one-way exhaust valve and an independent one-way air replenishing valve; the working stability and the controllability of the ventilation valve 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K17/30
CPCF16K17/30
Inventor 孙达立陈荣孟
Owner 慈溪市华龙电子有限公司
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