A detachable vacuum filter funnel

Abstract

The invention discloses a detachable vacuum filtering funnel which comprises a conical filtering funnel (3) for a support plate (4) with a hole or channel and a filtering medium (2), wherein the filtering medium (2) is placed on the support plate (4) with the hole or channel; the detachable vacuum filtering funnel further comprises a flange-shaped cylinder (1) arranged on the filtering medium (2);a chamber (5) capable of forming negative pressure is arranged at the bottom of the flange-shaped cylinder (1) in contact with the filtering medium (2); under vacuum effect, the negative pressure isgenerated by the chamber at the bottom of the flange-shaped cylinder (1), so that the filtering medium (2) is tightly pressed on the support plate (4) of the conical filtering funnel (3) by the flange-shaped cylinder (1). The detachable vacuum filtering funnel is capable of effectively reducing or eliminating the filtrate and filter cake loss in a vacuum filtering process, the device is easily cleaned, the pollution is avoided and the use is convenient.

Description

technical field [0001] The invention belongs to the technical field of solid and liquid filtration and separation, and relates to a detachable vacuum filter funnel, which is mainly used in the filtration and separation of solid and liquid mixtures under vacuum conditions. Background technique [0002] Filtration is a common separation method commonly used in laboratories to separate solids from solid-liquid mixtures. When the mixture passes through a filter media surface, the liquid passes through the filter media while solids and large particles remain on the filter media. Vacuum filtration is a rapid filtration separation method commonly used in laboratories. Vacuum filtration mainly passes the fluid in the mixture through filter media such as filter paper by applying vacuum suction, which is usually much faster than gravity filtration, so it is widely used. Vacuum filtration devices usually consist of a filter funnel, a vacuum nozzle connected to a vacuum source, and a ...

AI Technical Summary

Problems solved by technology

The filter funnel of the above-mentioned patent has a complex structure, is not easy to clean, and has relatively large limitations in use

U.S. patent application 20100038303A1 and Chinese patent 102781537A disclose a disposable polymer filter funnel, although it is convenient to use, it is wasteful

[0005] Many laboratory Buchner funnels are made by hand, the cost and price are relatively high, and they are easy to break

Some large Buchner funnels are basically made of ceramic materials, which are heavy and inconvenient to move during use

People have developed some easy-to-use detachable filter funnels, such as Chinese patent CN 201001985Y, which discloses a filter funnel, including a cylinder, a funnel body, a negative pressure regulating valve, a support plate, a sealing ring, a filter medium and a fastening lock , but this kind of detachable funnel has many components, and it is troublesome to disassemble and clean. A funnel of one specification cannot be used on another specification, and the versatility of the components is not strong.

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