Asymmetric metal film filtering element

Abstract

The invention relates to an asymmetric metal film filtering element used for filtering various materials and separating micro-diameter particles, which comprises a metal porous sheet and a layer of filter film which consists of a metal film and an organic film or a ceramic film and is arranged on the upper surface or the lower surface of the metal porous sheet. The asymmetric metal film filtering element can optimize two indexes of filter capacity and filter element strength, ensure the mechanical strength of a filter element, nearly not generate pressure loss, and further ensure not to influence the circulation; and the function of separating solid particles is borne by the metal film, the organic film or the ceramic film which is sintered with a porous substrate together, and the separation accuracy can reach submicron class; because the film is thin, the blockage is not easy to happen, the filter effect is better, and the accuracy is higher; and when the film is backwashed for regeneration, filtercake impurity liquid is easy to fall off from the surface of the film so as to prolong the service life of the filtering element.

Description

technical field [0001] The invention relates to an asymmetric metal membrane filter element for filtering various materials and separating microdiameter particles. Background technique [0002] At present, the filter parts of the metal powder filter elements used in industrial production are all symmetrical structures. The highest filtration accuracy of this symmetrical structure element can only reach 0.5 microns, and the flow rate is extremely low when using high-precision filter elements; because it is uniform For porous materials, in order to ensure sufficient mechanical strength, its thickness is generally designed at about 2.5mm-3.0mm, which makes the labyrinth micropores inside the porous material extend longer, and the flow rate is reduced. When particles enter it, it is easy to block, and It is not easy to clean after clogging, which affects the filtering effect and efficiency and shortens the service life of the filter element. Contents of the invention [0003]...

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Problems solved by technology

[0002] At present, the filter parts of the metal powder filter elements used in industrial production are all symmetrical structures. The highest filtration accuracy of this symmetrical structure element can only reach 0.5 microns, and the flow rate is extremely low when using high-precision filter elements; because it is uniform For porous materials, in order to ensure sufficient mechanical strength, its thickness is generally designed at about 2.5mm-3.0mm, which makes the labyrinth micropores inside the porous material extend longer, and the flow rate is reduced. When particles enter it, it is easy to block, and It is not easy to clean after clogging, which affects the filtering effect and efficiency, and shortens the service life of the filter element

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