Self-unloading dust air filter

Abstract

The invention discloses a dust self-discharging air filter. The dust self-discharging air filter comprises a box cover, a box body with a cavity, and a filter, wherein the box cover is fastened with the box body into a whole after being covered on a cavity opening of the box body, the box body is provided with a pipeline installation hole which is communicated with the cavity of the box body, the inner bottom wall of the box body is at least provided with an exhaust hole, the filter is positioned in the cavity of the box body, the box body at least is internally provided with two support pillars, the roots of the support pillars are fixedly connected with the inner bottom wall surface which is opposite to the cavity opening of the box body, free ends of the support pillars stretch towards the direction of the cavity opening of the box body, one part of the cavity of the body, between the free ends of the support pillars and the roots of the support pillars, is a dust discharging cavity, one part of the cavity of the box body, between the free ends of the support pillars and the cavity opening of the box body, is a filter containing cavity, and the filter is positioned in the filter containing cavity. According to the dust self-discharging air filter disclosed by the invention, the blockage of the filter due to dust can be prevented, and the phenomenon that an oil tank is sucked to be flattened under a negative pressure condition when the oil tank is in work can be avoided.

Description

technical field [0001] The invention relates to a self-unloading dust air filter. Background technique [0002] The carbon canister is generally installed before the gasoline tank and the engine. Since gasoline is a volatile liquid, the fuel tank is often full of vapor at normal temperature, and the function of the fuel evaporative emission control system is to introduce the vapor into combustion and prevent it from volatilizing into the atmosphere. An important part of this process is the activated carbon canister storage device. After the engine is turned off, gasoline vapor and fresh air are mixed in the tank and stored in the activated carbon tank. When the engine is started, the solenoid valve of the fuel evaporation purification device installed between the activated carbon tank and the intake manifold is opened, and the activated carbon Gasoline vapors in the tank are drawn into the intake manifold for combustion. Activated carbon is used to communicate with the at...

AI Technical Summary

Problems solved by technology

[0011] For the air filter 2 with the above structure, since the lower periphery of the filter 22 is provided with an elastic gasket 222, the elastic gasket 222 below the filter 22 will be attached to the box body 21 after installation. As the use time increases, more and more dust will be absorbed. These dusts will accumulate on the filter 22 and cannot be discharged. Excessive dust will cause the filter 22 to be blocked.

Since the air pressure in the fuel tank is in balance with the external air pressure, if the filter 22 is clogged, air cannot be replenished in the fuel tank. oil, the engine stalls and the vehicle doesn't work even in a superior environment

[0012] In addition, the air filter with the above-mentioned structure is installed in front of the air inlet of the carbon canister. Although the waterproof performance of this installation position is good, if a large amount of water from the outside (such as a rainstorm) enters the air filter In 2, although part of the water can be discharged from the auxiliary air inlet 212, because the box body 21 does not have a water-conducting structure, a part of the water will accumulate in the box body 21, soak the filter 22, and filter with excessive water absorption The filter will also cause blockage, that is, it will not allow air to pass through, and it will also have the same result as the dust blockage mentioned above.

[0013] Moreover, the air filter with the above structure has a limited service life due to the clogging of dust and water. The result of use verification is that this conventional air filter needs to be repaired when the vehicle travels to about 80,000 kilometers. replace

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