Automatic alarm device of fuel oil filter

Abstract

The invention relates to an alarm device, and aims to provide an automatic alarm device for a fuel filter of an internal combustion engine. The alarm device is provided with a sensor and comprises an unfiltered fuel cavity shell provided with an unfiltered fuel inlet and a filtered fuel cavity shell provided with a filtered fuel inlet, wherein the two shells are butted to form a cavity, a piston is arranged in the cavity, and two springs are arranged on two sides of the piston and between inner walls at two ends of the cavity respectively; the unfiltered fuel cavity shell and the filtered fuel cavity shell are provided with an adjusting conductive screw penetrating through the shell respectively, the piston is penetrated by a conductive rod, and two ends of the conductive rod correspond to the ends of the two adjusting conductive screws respectively; and the conductive rod is connected with a conducting wire for connecting with one electrode of a power supply, and the two adjusting conductive screws are connected with the conducting wire respectively for connecting with the other electrode of the power supply. The alarm device not only has the function of blockage alarm, but also has the function of breakdown alarm. The alarm device has the advantages of simple structure, small volume, flexible arrangement, low manufacturing cost and easy popularization.

Description

technical field [0001] The invention relates to an alarm device, in particular to an automatic alarm device for a fuel filter for an internal combustion engine. Background technique [0002] The air filter, oil filter and fuel filter are collectively referred to as "three filters". Extend engine working life and improve work efficiency. [0003] The fuel filter is an important part of the fuel supply system. In the process of processing and transportation, the fuel will inevitably be mixed with impurities such as powder layer and water. These impurities are very harmful to the fuel supply system. Especially for diesel engines, impurities will seriously aggravate the damage of the three precision components in the diesel fuel injection system. Wear, so that the pump oil pressure drops. If impurities enter the cylinder, it will lead to increased wear in the engine cylinder, worsened combustion, decreased power performance, and increased emissions. [0004] Filters should b...

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Problems solved by technology

[0005] However, breakdown of the filter layer or damage to the boundary bond is a more serious failure mode than the consequence of filter clogging failure

At this time, the fuel will directly enter the fuel injection system without filtering, which will not only cause some of the above-mentioned negative effects, but also lead to dangerous situations such as frequent engine shutdown and difficulty in starting.

[0006] If the clogging is ignored, or the clogging alarm fails, when the clogging reaches a certain level, the final pressure difference between the inlet and outlet oil pressure will be too large to break through the filter layer

With the increase in engine power density requirements, the use of some new technologies will lead to the possibility of fuel filter breakdown without clogging

For example, the use of high-pressure common rail fuel injection technology will cause a substantial increase in the oil return compared with the traditional fuel system, resulting in severe fluctuations in the oil pressure through the filter, and as the common rail service time increases, the nozzle wear will gradually increase. Increase, this will also cause changes in the oil return, and the oil pressure fluctuates violently. Under certain working conditions, the oil pressure may reach a large value at a certain moment and break down the filter layer.

At the same time, as the service time of the oil supply pump increases, the pump itself may produce some impurities, and the existence of these metal impurities further increases the possibility of breakdown

In addition, the boundary bonding of the filter layer may also be damaged due to weak bonding or softening after being immersed in oil for a long time

[0007] However, the current fuel filter is only designed with an alarm device in the case of clogging, while ignoring the breakdown of the filter layer and its consequences

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