Conduit oil outlet throttling structure and fuel oil prefilter shell assembly

Abstract

The invention discloses a guide pipe oil outlet throttling structure and a fuel oil prefilter shell assembly, a guide pipe is provided with a fuel oil channel and an airflow channel, the wall face of the airflow channel is provided with small exhaust holes, and the small exhaust holes are located below an oil outlet end opening of the fuel oil channel; a throttling channel is arranged below an oil outlet port of the fuel oil channel, located on the outer side of the small exhaust hole and communicated with the small exhaust hole, and the throttling channel comprises an upper overflowing section with the through-flow sectional area gradually reduced from top to bottom. An oil outlet is formed in the bottom of the throttling channel. The throttling structure is arranged below the fuel oil channel of the guide pipe, when fuel oil flows through the throttling structure, the flow speed of the fuel oil is increased, the static pressure of the fuel oil is reduced, the pressure difference between the two sides of the small exhaust holes is increased, and even if the flow speed of the fuel oil in the fuel oil channel is low, the fuel oil can be accelerated to the high flow speed level after flowing through the throttling structure; gas in the gas flow channel can be smoothly and continuously discharged, and it is guaranteed that the fuel oil liquid level can rise to the satisfactory height.

Description

technical field [0001] The invention relates to the technical field of fuel filters, in particular to a throttling structure of a conduit oil outlet and a housing assembly of a fuel prefilter. Background technique [0002] The fuel pre-filter is set in the engine fuel supply system, and is used to filter out impurities, water and other pollutants in the fuel, and then input it into the fuel delivery pump and fuel injector, so as to avoid excessive wear and tear of important parts such as fuel delivery pump and fuel injector. More or blockage and other problems to ensure the normal operation of the engine. The fuel pre-filter with electric pump is usually equipped with an exhaust structure, so that the gas at the upper end of the main housing can still be discharged through the oil outlet even after the electric pump stops working, so that the fuel liquid level of the fuel pre-filter rises to improve the filter element. utilization rate. [0003] The applicant's Chinese inv...

AI Technical Summary

Problems solved by technology

This exhaust structure has the following disadvantages: when the fuel flow rate of the fuel pre-filter is low, for example, when the fuel flow rate is 50L / min~250L / min, due to the low fuel flow rate, according to Bernoulli's theorem, the fluid flow rate and The static pressure of the fluid is inversely proportional. When the fluid flow rate decreases, the static pressure of the fluid will increase, that is, when the fuel flow rate is low, the static pressure will increase, and the pressure difference between the inside and outside of the exhaust hole will decrease, which is not conducive to the first The gas in the channel is exhausted, and the exhaust effect of the first channel is not good, which affects the rise of the fuel level, so that the fuel level cannot rise to a satisfactory height

[0004] The installation position of the fuel pre-filter is usually higher than the installation position of the automobile fuel tank. If there is leakage at the oil outlet pipe of the fuel pre-filter or the pipeline at the rear end of the oil outlet pipe due to seal failure, after the engine stops working, the external gas will It may enter the fuel outlet pipe from the leak, then pass through the electric pump, and enter the interior of the pre-filter from the pipe, causing too much gas to enter the interior of the pre-filter, resulting in a drop in the fuel level, thereby reducing the utilization rate of the filter element and reducing the use of the filter element time life

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