A graded suction filter device

Abstract

The invention discloses a hierarchical suction filtration device and aims to provide a hierarchical suction filtration device which is convenient to operate and capable of avoiding the problem that the testing result accuracy is affected as an experiment sample can be contaminated when a filtering membrane is replaced. The hierarchical suction filtration device comprises a vacuuming box body and aswitchable hierarchical filtering device, wherein a sealed inner cavity is formed in the vacuuming box body; the vacuuming box body comprises a lower box body of which the upper end is opened, and anupper sealing cover for sealing the opening in the upper end of the lower box body; a vacuuming interface is formed in the outer side surface of the lower box body; a vertical inserting hole which iscommunicated with the sealed inner cavity of the vacuuming box body is formed in the upper surface of the upper sealing cover.

Description

technical field [0001] The invention relates to a suction filtration device, in particular to a graded suction filtration device. Background technique [0002] In the analysis and detection experiments, many samples are solid-liquid mixtures, such as wastewater, algae culture solution, sediment interstitial water, etc., and the solid and liquid phases need to be separated before the two phases can be measured separately. Present suction filtration device is generally made up of vacuum pump and filter device, and filter device can only use one filter membrane at a time. For turbid water quality, it is often difficult to directly filter with a microporous (such as 0.22 micron) filter membrane with a smaller pore size, and it is easy to block the micropores, resulting in an increase in the pressure on the membrane; excessive pressure may destroy the original occurrence of the sample. state (such as destroying algae cells, causing its intracellular fluid to dissolve and affecti...

AI Technical Summary

Problems solved by technology

For turbid water quality, it is often difficult to directly filter with a microporous (such as 0.22 micron) filter membrane with a smaller pore size, and it is easy to block the micropores, resulting in an increase in the pressure on the membrane; excessive pressure may destroy the original occurrence of the sample. state (such as destroying algae cells, causing its intracellular fluid to dissolve and affecting the original properties of the culture medium); therefore, it is usually necessary to use a filter membrane with a larger pore size for pre-filtration to remove large particles, and then replace the filter with a smaller pore size. Membrane, the pre-filter is subjected to secondary filtration, which not only increases the workload, but also increases the risk of experimental contamination and affects the accuracy of the measurement results

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