Water purifier abstract
The portable water purifier comprises a rotary filtering vessel
which is surrounded by a compartment designed to collect the water
filtered through the lateral wall of the filtering vessel, this
vessel being rotatably mounted on its axis of revolution. It also
comprises a rotary drive member whose output shaft is made fastened
to the rotary filtering vessel and a flow pipe for the filtered
water which communicates with the outside and with the bottom of
the compartment for collecting the filtered water, and a container
for the water to be filtered including means enabling the water
to be passed into the rotary vessel.
Water purifier claims
The embodiments of the invention in which an exclusive property
or privilege is claimed are defined as follows:
1. A portable water purifier, especially for domestic purposes,
comprising a housing enclosing at its upper part a rotary filtering
vessel having a central inlet opening and a perforated lateral wall
bearing filtering layers, an open container for the water to be
purified on the top of the housing and having a water outflow orifice
in line with the central inlet opening of the filtering vessel,
said filtering vessel having a closed bottom fastened to an output
shaft on a rotary drive member at the lower part of the housing
and an annular compartment surrounding the filtering vessel and
bounded by the lateral wall of the housing to collect the water
filtered through the filtering layers of said vessel, said annular
compartment having a discharge outlet opening for discharging the
purified water, said filtering layers comprising at least one layer
whose porosity is selected to retain the bacteria contained in the
water to be purified, said flow orifice of said container including
a valve, and means to open the valve when the vessel is rotated.
2. Purifier according to claim 1 wherein said filtering layers
borne by the lateral wall of the filtering vessel comprises in the
direction of passage of the water through the filter, a coarse pre-filter,
at least one layer of active charcoal, and an outer filtering diaphragm
whose porosity is selected to retain the bacteria contained in the
water to be purified.
3. Purifier according to claim 2 wherein the active charcoal layer
is constituted by paper impregnated with active charcoal.
4. Purifier according to claim 2 wherein the filtering diaphragm
has pores whose average dimension is of the order of 0.45 micron.
5. Purifier according to claim 2 wherein the filtering diaphragm
has pores whose average dimension is of the order of 0.22 micron.
6. Purifier according to claim 4 wherein the filtering diaphragm
is constituted by a layer of acrylonitrile and polyvinyl chloride
copolymer deposited on a polyamide cloth.
7. Purifier according to claim 1 wherein the filtering vessel
comprises a first cylindrical basket including a perforated lateral
wall, in which is permanently seated a second cylindrical basket
whose lateral wall is also perforated and carries the filtering
8. Purifier according to claim 1 wherein the container for the
water to be filtered is disposed removably on the upper edge of
the housing, the bottom of this container closing the upper portion
of the filtering vessel and the annular collection compartment for
the filtered water.
9. Purifier according to claim 1 wherein said means comprise,
inside the filtering vessel, an arm hinged at one end to an axial
projection of the bottom of the filtering vessel, the free end of
said arm being directed towards the bottom of the vessel when the
purifier is inactive, the end of this arm adjacent to the hinge
including a cam which can lift the valve when the arm is brought
into horizontal position under the effect of the centrifugal force
resulting from the rotation of said vessel.
Water purifier description
BACKGROUND AND GENERAL DESCRIPTION OF THE INVENTION
The present invention relates to a portable water purifier, especially
for domestic use.
The purifier provided by the invention is designed to purify domestic
running water, especially removing from it its sometimes unpleasant
taste, arising from the addition of chlorine (sodium hypochlorite
or Javel water) or from the decomposition of various organic materials.
Portable water purifiers of this type are already known. In these
known water purifiers, the water contained in a storage container
is circulated through an active charcoal based filter, by means
of a pump. The filtered water then flows into a water collecting
After filtration, the filter of these devices remains soaked with
water. The presence of water in the filter creates a medium favorable
to the proliferation in situ of micro-organisms which are then capable
of passing into the filtered water. In addition, these devices include
upstream and downstream of the filter, a water circuit which is
difficult to empty completely and, consequently, capable of polluting
the water introduced subsequently into these devices.
It is an object of the present invention to overcome the drawbacks
of these known devices. It is another object of the invention to
provide a water purifier of simple construction and ensuring rapid
and efficient filtration of the water, particularly by removing
from the latter bacteria or other micro-organisms capable of affecting
the quality of the potable water.
According to the invention, there is provided a water purifier
characterised in that it comprises a housing including:
a rotary filtering vessel which is surrounded by a compartment
designed to collect the water filtered through the lateral wall
of the filtering vessel, this vessel being mounted rotatably on
its axis of revolution;
a rotary drive member whose output shaft is rendered fastened to
the rotary filtering vessel and a filtered water flow pipe which
communicates with the outside and with the bottom of the compartment
designed to collect the filtered water;
a container for the water to be filtered including means enabling
the water to be passed into the rotary vessel.
Filtration by centrifugation has already been used in industry
to free a liquid from solid suspended particles, but not for purifying
running water available to the public.
In the water purifier according to the invention, the filtration
by centrifugation enables filters with pores of very small size
to be utilized, so that it is possible to free the water from micro-organisms
such as bacteria. In addition, the filtration of the water by centrifugation
necessitates rotary drive means of very much lower power, which
is advantageous in the case of an apparatus for domestic use.
In addition, after centrifugation and exhaustion of the water to
be filtered, the filter is substantially dry. The proliferation
of micro-organisms retained in the filter is prevented. Other features
and advantages of the invention will also appear in the description
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings relating to particular embodiments
given by way of nonlimiting examples:
FIG. 1 is a longitudinal section of an embodiment of a purifier
according to the invention;
FIG. 2 is a perspective view of one of the baskets of the centrifugation
FIG. 3 is a perspective view of the other basket of this vessel;
FIG. 4 is a sectional view, on a larger scale, of a portion of
the filtering wall of the vessel;
FIG. 5 is a view in longitudinal section of the upper portion of
the purifier according to the invention, the latter being in the
course of operation; and
FIG. 6 is a similar view to that of FIG. 5 the container for the
water to be filtered being in "cover" position.
DESCRIPTION OF PARTICULAR EMBODIMENTS
In the embodiment of FIG. 1 the portable water purifier for domestic
use comprises a base 1 on which is placed a flask 2 for containing
purified water. This base 1 is surmounted by a foot 3 carrying a
On the housing 4 is placed an open container 6 for holding the
water to be purified.
The housing 4 encloses at its upper part a filtering vessel 7
rotatably mounted on its axis of rotation XX'. The closed bottom
8 of this vessel is made fastened to the output shaft 9 of an electric
motor 10 placed at the lower part of the housing 4.
In the example shown, the filtering vessel 7 comprises (see FIGS.
3 and 4) a first cylindrical basket 11 whose lateral wall includes
vertical slots 13 distributed regularly around this wall.
In this basket 11 is nested, as shown in FIG. 1 a second basket
14 (see FIGS. 2 and 4) whose lateral wall includes horizontal slots
16. This second basket includes, opposite its open base 18 a wall
19 having a central opening 20 for the introduction of the water
to be filtered held in the container 6. This wall 19 includes, in
addition, tongues 12 extending parallel to the wall, and forming
between them and said wall a certain space e. In this space e is
housed a filtering element comprising preferably three sheets of
filter paper 17b impregnated with particles of active charcoal filled
with 1% by weight of silver, inserted between two sheets 17a, 17a'
of nonwoven synthetic fibers, constituting a coarse pre-filter.
On the outer surface of the wall of the second basket is fixed
a filtering diaphragm composed of a layer of acrylonitrile and polyvinyl
chloride copolymer 17c deposited on polyamide fabric constituting
a mechanical support for said layer 17c. The assembly of layer 17a,
17b and 17c constitutes the filter 17. Fixation is obtained by hot
welding of the polyamide fabric on the constituent material of the
basket 14 in the zones 14f and 14f'. Threads of glue 15 and 15'
are then deposited in these weld zones. The two walls are assembled
by nesting. A thread of glue 15" is deposited between the bottom
of the first basket 11 and the free edge of the second basket 14.
In addition, the upper edge of the basket 11 comprises locking
tabs 22 retainable by openings 23 formed in a collar 24 arranged
on the upper edge of the cartridge 14. These locking tabs 22 and
these openings 23 render the first basket 11 mechanically fastened
to the second basket 14 during the time of drying of the glue thread
As indicated in FIG. 1 the filtration vessel 7 is composed by
two baskets 11 and 14 assembled together, surrounded by an annular
compartment 25 bounded by the lateral wall of the housing 4 capable
of collecting the water filtered through filtering layers 17a, 17b,
The bottom 26 of this annular compartment 25 includes a peripheral
trench 27 enabling the flow of the filtered water to a vertical
pipe 28 for removing the water, which opens outside of the housing
4 in line with the carafe 2 for collecting the purified water.
The container 6 for the water to be filtered rests on the upper
edge 4a of this housing, the bottom 29 of the container 6 thus forming
the upper part of the compartment 25 for collecting the filtered
The bottom 29 of the container 6 includes a central water flow
orifice 30 placed facing the water inlet opening 20 in the filtering
vessel 7. This water flow orifice 30 includes a valve 31 which closes
this orifice 30 when this apparatus is inactive as shown in FIG.
This valve 31 is associated with means enabling its automatic opening
when the filtering vessel 7 is rotated by the motor 10. These means
comprise, inside the filtering vessel, an arm 32 forming a weight,
hinged at 33 at one end on a axial projection 34 of the bottom
8 of the first filtering basket 11. The free end of the arm 32 is
directed towards the bottom of the basket 11 when the apparatus
is inactive as indicated in FIG. 1. The end of the arm 32 adjacent
to the projection 34 includes a cam 35 which is capable of lifting
the valve 31 when this arm 32 is brought into horizontal position,
under the action of the centrifugal force resulting from the rotation
of the basket 11 (see FIG. 5).
In the storage position of the apparatus, the empty container 6
is turned over onto the housing 4 in the manner of a cover, as
indicated in FIG. 6.
The operation of the water purifier which has just been described
will now be given in detail.
On the first use of the water purifier, the filtering vessel 7
is fastened to the drive-shaft 9.
On the housing 4 is placed the container 6 filled with the water
to be purified. In this position, the valve 31 closes the orifice
30 from the container 6 the arm 32 bearing the cam 35 being in
the position shown in FIG. 1.
To purify the water held in the container 6 it suffices to start
the electric motor 10. The filtering vessel 7 is rotated at a speed
comprised between 2000 and 3000 rpm. Under the effect of centrifugal
force, the arm 32 is brought into horizontal position as indicated
in FIG. 5 and the cam 35 lifts the valve 31.
The water is then admitted into the filtering vessel 7. Under the
effect of the centrifugal force, the water is filtered through the
filter 17 successively traversing the layers 17a, 17b, 17c.
The layer 17a constitutes a pre-filter to retain the coarse particles
retained in the water whilst the second layer 17a' is designed to
retain the active charcoal particles which can be detached from
the paper sheet 17b. The active charcoal contained in these paper
sheets 17b removes from the water its bad taste caused by the chlorinated
products and the organic substances in decomposition.
For current domestic use, when the water delivered by the public
mains is utilized, the average dimension of the micro-pores represented
by the layer 17c may be of the order of 0.45 micron.
When it is desired to use river or lake water directly, it is necessary
to use microporosities of the order of 0.22 micron in order to arrest
all the micro-organisms which can be found in these waters.
The filtered water is collected in the annular compartment 25 which
surrounds the filtering vessel 7 then flows into the carafe 2
passing through the evacuation pipe 28.
When the whole of the water has been filtered, the filter 17 contains
practically no more water. The bacteria or the micro-organisms contained
in the filtering diaphragm 17c thus find themselves in a medium
which is practically dry and unfavorable to their proliferation.