Diesel engine oil-suction over-speed protection stopping device

Abstract

This invention discloses a shut-down device for oil attraction and overspeed protection of diesels including a fuel transmission pump,a fuel filter and a high pressure oil pump, in which, a binary four-way directional valve controlled by an executor is connected between the fuel transmission pump and the high pressure oil pump and the filter via a sealed connecting tube solution , the directional valve includes two working positions and four oil channels , the high pressure oil pump is matched with a single-way check valve. When the diesel runs away of control, it emits a signal by a monitor device, the directional valve can alter the oil supply direction and utilize the pump attraction function of the transmission pump to urge part of low pressure oil cavity vacuum in the high pressure oil pump and make the high pressure oil pump oil-less to stop supplying pressure oil to the spraying nozzle and no combustion in the inner cylinder to force the rotation speed to drop down till stopping.

Description

technical field [0001] The utility model patent relates to the control of combustion engines in the field of mechanical engineering, in particular to a diesel engine oil suction overspeed protection parking device. It is a protective device for controlling the speed of diesel engines, suitable for multi-cylinder diesel engines. It can be used for single high-pressure oil pumps with fuel delivery pumps, and can also be used for combined high-pressure oil pump structures. Background technique [0002] At present, in the control of combustion engines in the field of mechanical engineering, there are generally two methods for stopping diesel engines: one is to block the gas circuit; the other is to block the oil circuit. There are two ways to block the air path: one is to block the fresh air directly into the cylinder; the other is to block the discharge of exhaust gas; they block the intake and exhaust by using electric or pneumatic switching actions of the butterfly valve with...

AI Technical Summary

Problems solved by technology

There are two ways to block the air path: one is to block the fresh air directly into the cylinder; the other is to block the discharge of exhaust gas; they block the intake and exhaust by using electric or pneumatic switching actions of the butterfly valve with the same diameter. The advantages are Shut down quickly, the disadvantage is that there is a lot of smoke and it is difficult to start again, and the environment is seriously polluted when switching on and off

There are also two ways to block the oil circuit: one is to pull the oil pump oil adjustment rod to achieve it, the advantage is that the stop is quick, and the disadvantage is that the oil adjustment rod is stuck and cannot be pulled; the other is to cut off the diesel oil supply pipeline to make the diesel oil The advantage of stopping the supply is reliable parking, even if the oil adjustment rod is stuck, the disadvantage is that the parking time is long (the oil stored in the pipeline must be burned out), and the air must be manually exhausted when restarting, otherwise it will be difficult to start

Therefore, there are many shortcomings in the above-mentioned air cut-off and oil cut-off (cut off oil supply) scheme adopted in the overspeed protection action of the diesel engine, which is not commensurate with the current energy-saving and environmental protection themes.

And the above scheme has the disadvantages of complex structure, long oil stop time and difficult operation

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