GB2250927A

GB2250927A - Suction filter

Info

Publication number: GB2250927A
Application number: GB9027517A
Authority: GB
Inventors: Kwok-Tai Lam
Original assignee: LAM KWOK TAI
Current assignee: LAM KWOK TAI
Priority date: 1990-12-19
Filing date: 1990-12-19
Publication date: 1992-06-24
Also published as: GB9027517D0

Abstract

Liquid is drawn through filter paper or active carbon 12, in a funnel 1, into a two-part flask 2, 3 by an electric fan 6, 7 located in a lower chamber 5 and applying suction to the flask through a demountable external duct 4, 10. Filtrate is drawn from the flask through a tap 9. The filter is used for water, soya milk, fruit juice or homemade wine. <IMAGE>

Description

SUCTION FILTER This invention relates to a suction filter.

The simplest method for filtering is the use of a funnel and a piece of filter paper, but it is very tedious when dealing with finer suspended particles. In laboratory, we have suction filtration apparatus, but we must use the apparatus near the sink with the tap of running water, and it only handles a small quantities of substances at a time. Moreover water is too precious to be used in this way. In industry, when dealing with filtration, the high pressure has to be involved which is not suitable for domestic use. This invention is the modification of the suction filtration method that is using in the laboratory.It utilizes the rotations of the fan to create the.suctional force instead of running water from the tap, a valve to withdraw the filtrate instead of separating the funnel and the flask to decant the filtrate out of the flask, and it can deal with larger quantities of substances. It is most suitable for filterring off the suspended and cloudy substances that sometimes present in the tap water, ideal for home wine making filtration, filterrincr off the residues in the production of soya milk and making of some clear fruit juices and the like.

The construction of this filtering device is illustrated below with reference to the accompanying drawing. Tt comprises of a funnel 1 with a piece of suitable size filter paper 12 on it, a graduated flask that consists of two separate parts - the upper part of the flask 2 has a hole that connects to the air duct 4 where the lower part of the flask 3 receives the filtrate and the air from the funnel, they are twisted and fitted together at the end. a chamber 5 with slits 8 open to the atmosphere at one side, where the other side of the chamber has an opening to connect the air duct 4 to the upper part of the flask 3, an electric motor 6 which is outsize the chamber with an axis protruded through the wall to the inside of the chamber where a fan 7 is fixed at the end, a tap 9 is mounted at the bottom and side of the lower flask for withdrawal of filtrate, a rubber washer 11 is seated at the twisted end of the runner part of the flask and the push fit device 10 is connecting the two parts of the air duct to each other.

Twist tight the two parts of the flask 2 and 3 together, push in and fit the separable parts of the air duct, put a piece of suitable size filter paper 12 on the funnel 1 (or put some activated carbon particles on top of it that depends on what you want to get rid of), place a container underneath the tap 9 and get ready for the withdrawal of filtrate from the tap, then pour some cloudy water with suspended particles into the funnel 1 and switch on (switch not shown).

When the current is on, the fan 7 will rotate with the electric motor 6, thus a stream of air is blowing to the atmosphere through the opening slits 8 and a suctional force is created by the rotations of the fan in the chamber 5 and transmitted throngh the air duct to every part of the vessel. The filtrate will then be sucked in with the air through the filter paper on the funnel l to the graduated flask 2 and 3. The residue will he left behind on the filter paper. The filtrate will drop to the hottom of the flask by its own weight, and will be withdrawn by means of the tap 9.

The air from the flask will pass through the air duct 4 to the chamber 5 and will he blown out to the atmosphere throngh the opening slits 8 and may be circulated again.

Claims

A suction filter comprises of n funnel with a suitably porous substance as the filter such As filter paper, activated carbon particles etc. on it, a flask with upper and lower parts for which the two parts can be twisted and fitted together, a chamber with opening slits At one side and the other opening that connects the chamber to the upper part of the flask through an air duct is at the other side, an electric motor which is positioned out- side the chamber has an axis that protrudes through the wall to the inside chamber, a fan which is fixed at the end of the axis is blowing to the opening slits and to the outside atmosphere when it rotates, a tap with a valve to withdraw the filtrate is at the bottom and side of the flask as described with reference to the accompany drawing.