Turnover oil leakage preventing vent valve for fuel tank

Abstract

The invention discloses a turnover oil leakage preventing vent valve for a fuel tank. The vent valve comprises an air inlet end shell, an exhaust end shell, a guide seat, a cup body, a fork-shaped piece and a steel ball; the air inlet end shell and the exhaust end shell are cooperatively and spirally connected through threads; the cup body is clamped between the air inlet end shell and the exhaust end shell through an annular plate, and the bottom of the cup body is provided with at least two first air inlet holes; the guide seat is fixed into a groove of the air inlet end shell through a check ring and provided with a guide hole and second air inlet holes located on the two sides of the guide hole; an annular sealing piece extending into the cup body is vulcanized on the air inlet end shell; and the fork-shaped piece comprises a guide rod and a contract disc which are integrally formed, the guide rod extends into the guide hole, the contact disc and the steel ball are both located in the cup body, and the steel ball is freely arranged under the contact disc. The vent valve has the advantages of being low in manufacturing cost and reliable in closing, having the functions of secondary leakage preventing and forced reset, and the like.

Description

technical field [0001] The invention relates to a helicopter fuel system, in particular to the design fields of helicopter survivability and helicopter dropability, and more specifically, relates to a vent valve used for preventing overturning and oil leakage of a fuel tank. Background technique [0002] The helicopter fuel system is a system that stores fuel and supplies it continuously to the engine. When a helicopter crashes, the helicopter may flip over, causing the fuel in the fuel tank to leak from the fuel tank vent, which may cause a fire. In order to improve the survivability of the helicopter and meet the crashworthiness requirements of the helicopter, the vent valve of the fuel tank of the helicopter needs to be installed with an anti-overturn oil leakage valve to prevent the fuel in the fuel tank from leaking from the vent of the fuel tank when the helicopter crashes and overturns. Existing anti-overturn oil leakage vent valves for helicopter fuel systems usuall...

AI Technical Summary

Problems solved by technology

Existing anti-overturn and oil leakage vent valves for helicopter fuel systems usually use breathing vent valves, which are composed of intake valve components and exhaust valve components. The cost is relatively high, and they are not suitable for small civil helicopter fuel systems.

In addition, the breather valve may also have secondary fuel leakage caused by the seal not being tightly closed, and the breather valve may not be reset due to jamming after the action.

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