An engine overspeed protection device with a force arm component

Abstract

The invention relates to an engine overspeed protection device with a moment arm member, comprising a valve body, a stepped hole is arranged at the bottom of the valve body, a mounting seat is arranged at the top, an upper rotating part, a lower rotating part, a valve, and the lower rotating part and the valve body are provided. A valve closing mechanism is provided between the valve bodies, and the electromagnetic valve switch connected to the mounting seat; the upper end of the upper rotating part is provided with a shallow groove and a large screw hole, and the lower end is provided with an upper card slot; a force arm member is composed of a flat The straight section and the vertical section whose upper end is connected to one end of the straight section are composed of a through hole in the middle of the straight section, a screw hole at the connection between the straight section and the vertical section, and a screw hole in the lower part of the vertical section. There is a strip hole; the straight section of the force arm member is matched with the shallow groove at the upper end of the upper rotating part, and is connected and fixed by a large screw. Head correspondence / mating. The invention has sensitive response and high reliability, and has dual protection functions of overspeed automatic shutdown and manual emergency shutdown.

Description

technical field [0001] The invention relates to an engine control part, in particular to an engine overspeed protection device with a force arm component. Background technique [0002] In order to prevent the engine from overspeed damage accidents, a fuel cut-off valve is usually installed on the engine to cut off the fuel supply and stop supplying oil to the high-pressure oil pump. In this case, even if the fuel supply is cut off, it will not work, because although the fuel supply has been cut off at this time, there is still a part of fuel in the engine fuel pump cavity, which cannot stop the engine quickly, causing serious damage to the engine. Tests have proved that when an emergency shutdown is required, the gas cut-off is faster than the oil cut-off, so the overspeed protection device for gas cut-off came into being. Generally, this overspeed protection device on the market has low reliability, that is, when the engine overspeeds, the valve cannot be closed, and an em...

AI Technical Summary

Problems solved by technology

Generally, the overspeed protection device on the market has low reliability, that is, when the engine overspeeds, the valve cannot be closed, and an emergency stop cannot be realized, resulting in an engine damage accident

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