A suction filter

Abstract

The invention provides a novel dirt suction filter mainly composed of a filter body, a dirt suction assembly and a power cylinder. The filter body is rigidly connected with a polish rod of the power cylinder, the dirt suction assembly is arranged in a shell of the filter body, annular space is formed by a movable dirt suction plate of the dirt suction assembly and a filter element, independent dirt suction channels are formed in the movable dirt suction plate according to partitions, the annular space is connected with the dirt suction channels, fluid passes through the surface of the filter element at high speed under the effect of differential pressure, dirt on the surface of the filter element is impacted and removed, and the purpose of cleaning the portions, on the annular channels, of the filter element is achieved. The dirt suction assembly is rigidly connected with a connecting rod of the power cylinder, the connecting rod of the power cylinder reciprocates under the effect of fluid pressure, the dirt suction plate is pushed to reciprocate on the surface of the filter element, and the purpose of cleaning the whole filter element in the partitions is achieved. The novel dirt suction filter is simple and reliable in structure, easy to operate, wide in installation range, low in use cost, safe and reliable, the occupied land is saved, a dirt removal effect is achieved, online dirt removal of one filter body can be achieved, dirt removal efficiency is high, and the dirt solution amount is small.

Description

technical field [0001] The invention relates to the field of filters, in particular to a dirt suction filter. Background technique [0002] When the N-1 filter is working, the fluid passes through the filtering effect of the surface of the filter element, and the impurities greater than its filtration precision are intercepted outside, and the remaining fluid, that is, the filtered liquid, enters the next process through the filter screen. After the filter is used for a period of time, A layer of impurities builds up on the surface of the filter element, and the differential pressure between the front and rear sides of the filter element increases, triggering filter backwash. The traditional method is: put one filter in the backwashing state, and the remaining N-1 filters continue to filter. Gas-assisted backwashing: introduce external high-pressure gas, reverse the flow of the fluid inside the filter to be backwashed, and quickly empty it to remove the filter cake layer ac...

AI Technical Summary

Problems solved by technology

Therefore, this requires the use of large flow fluids, resulting in a relatively large amount of backwashing liquid

Since the fluid contains colloidal or bituminous substances, they will adhere to the surface of the filter element, resulting in poor backwashing effect. According to the requirements of the process, a clean fluid that can dissolve these viscous substances will be introduced to soak for a period of time, and then backwash again , this part of the clean fluid is treated as waste oil and re-refined, resulting in increased energy consumption and cost

At the same time, even if a large flow passes through the surface of the filter element that needs to be backwashed in reverse under pressure, due to the large surface area of ​​the entire filter element, the flow rate distributed on the surface of a large number of filter elements that needs to be backwashed will be slower. According to Bernoulli It can be seen from the equation that the pressure lost on the surface of the filter element is relatively low, resulting in unclean recoil of the filter element, that is, incomplete regeneration. After a long time, the filter element needs to be cleaned outside the device, that is, it must be removed from the container first, and then use physical and chemical washing

[0003] In this way, when the filter element is cleaned, not only the amount of dirty liquid is large, but also energy consumption and cost are increased.

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