Water purifier abstract
A water purifier houses a material for water treatment. The water
purifier employs an active carbon as this water purifying material,
and this active carbon has pores on the surface of which water soluble
mineral component is provided.
Water purifier claims
What is claimed is:
1. A water purifier comprising a housing having an inlet for raw
water to be purified and an outlet for purified water, said housing
containing a cartridge comprising a water purifying material arranged
therein so that the raw water to be purified passes through said
water purifying material when the raw water to be purified is supplied
from the inlet for raw water, characterized in that granular activated
carbon having a plurality of pores is employed as said water purifying
material, said pores extending from an outer periphery of said granular
activated carbon to within the interior of said granular activated
carbon and being open to the outside of said granular activated
carbon at its periphery; a water-soluble salt selected from the
group consisting of calcium carbonate, sodium carbonate and magnesium
carbonate is provided on surfaces of the pores within said granular
activated carbon so as to permit said water-soluble salt to dissolve
into the water; and a fluidic film is provided on the periphery
of said granular activated carbon; wherein said water-soluble salt
is dissolved in a manner such that water filling said pores of said
granular activated carbon contains the water-soluble salt in a saturated
2. A water purifier according to claim 1 further comprising a
filter provided between the water purifying material and the outlet
for purified water.
3. A water purifier according to claim 1 further comprising means
for connecting the housing to a faucet for supplying raw water to
be purified and a passage leading to the inlet for raw water to
be purified from said connecting means.
4. A water purifier according to claim 3 further comprising a
raw water outlet for discharging untreated raw water and a change-over
valve for allowing selection of treated purified water or untreated
raw water, said change-over valve allowing flow of raw water to
said passage when treated purified water is selected and allowing
flow of raw water to said raw water outlet without passing through
said water purifying material when untreated raw water is selected.
5. A water purifier according to claim 1 further comprising a
water holding portion between the inlet for raw water and the water
6. A water purifier according to claim 5 wherein said holding
portion is provided in a down-flow portion with a strainer by which
water to be treated is evenly distributed before passing through
said water purifying material.
7. A water purifier according to claim 1 wherein said water soluble
salt is provided on the surface of said pores of said granular activated
carbon in the form of a film.
8. A water purifier according to claim 7 wherein said film is
of a thickness such that void spaces are left within said pores.
9. A water purifier according to claim 1 wherein said water-soluble
salt is provided deep within the interior of said granular activated
Water purifier description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a water purifier, and more particularly,
to a water purifier employing a water purifying material which contains
water soluble mineral components.
2. Description of the Prior Art
Heretofore, water purifiers of this type have been known, and one
of such typical purifiers employs a natural stone such as an ore
contained with mineral components as the water purifying material.
This type of water purifier, however, suffers from a problem in
that the stone employed as the water purifying material has few
mineral components which dissolve in treated water. Therefore, a
water purifier has been proposed which employs solidified minerals
such as calcium hydroxide as the material for treating water. This
type of water purifier also involves problems in that the mineral
components in the water purifying material which continue to dissolve
even when water remains stagnant until its concentration becomes
too high soon become too sticky to be used. To obviate these disadvantages,
Japanese Utility Model Laid-Open No. 48795/1984 discloses a water
purifier which employs a solid ceramic material as the material
for treating water the material being fired but not glazed and containing
minerals such as calcium oxide. In this type of water purifier,
however, only a small quantity of mineral components is absorbed
by the water because the surface area of its water purifying material
cannot be made large enough to ensure that a sufficient amount of
the mineral components are dissolved. Further, each of these known
water purifiers additionally suffers from the problem that chlorine
and other impurities which impair the taste and odor of water cannot
be sufficiently removed.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a
water purifier employing a water purifying material which is capable
of purifying water by removing chlorine and the like, and which
contains water soluble mineral component which dissolves in water
at a controlled range of concentration.
To this end, according to the invention, there is provided a water
purifier incorporating a water purifying material, wherein the improvement
is characterized in that active carbon is employed as the water
purifying material, and that water soluble mineral component is
provided on the surface of pores of this active carbon.
More specifically, in the case of employing an active carbon with
mineral component provided thereon as a water purifying material,
impurities in water such as chlorine which impair the odor and taste
of water can be removed. At the same time, it is possible for the
mineral component which is provided on the activated surface of
the active carbon to be dissolved in a treated water at a certain
range of concentration.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective side view of an embodiment of a water purifier
according to the invention, with parts broken away and in section;
FIG. 2 is a view of the water purifying material employed in the
water purifier according to the invention, which is enlarged in
a simulated manner.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A preferred embodiment of a water purifier according to the invention
will be described hereinunder with reference to the accompanying
Referring to the Figures, the reference numeral 1 designates a
water purifier which is mainly composed of a housing having a faucet
connecting portion 2 a body 3 a change-over valve 4 a knob 5
a cartridge 6 through which water can be passed, and a cover 7
and which can be mounted on or dismounted from a faucet 8 by means
of the faucet connecting portion 2.
By turning the knob 5 the flow of water is changed over within
a change-over passage 9 by means of the change-over valve 4 so that
it is directed either toward an untreated water outlet 10 or a purified
water outlet 11.
Further, the cartridge 6 contains at its bottom a filter 12 for
filtering water, and opens to the purified water outlet 11 through
an effluent passage 13. The cartridge 6 is also provided with an
influent passage 14 which extends from the change-over passage 9
and communicates with a water holding portion 15 provided between
the cartridge 6 and the cover 7. Water to be treated is evenly distributed
by a strainer 16 at the holding portion 15 and then passes through
a water purifying material 17 which treats water and is contained
in the cartridge 6.
The water purifying material 17 as shown in FIG. 2 has a substance
18 which is made of granular active carbon C, and which has pores
20 on the surface of which a film 19 of mineral components such
as calcium carbonate and sodium carbonate is provided. As can be
seen in FIG. 2 pores 20 extend from the outer periphery of the
activated carbon C to within the interior of the active carbon C
and are open to the outside of the active carbon C at its periphery.
The mineral component film 19 is provided both on the periphery
of the active carbon C and on the interior surfaces of the pores
within the active carbon C, including surfaces deep within the active
carbon C. The mineral component is provided as a film 19 with such
a thickness so as to leave void spaces in the pores 20.
The reference numeral 21 denotes a fluidic film which is to be
With the above arrangement, the water purifier is operated as follows.
For supplying raw water, water flows through the faucet 8 the
change-over valve 4 and the raw water outlet 10 in this order and
is discharged without being treated. On the other hand, for supplying
treated water, water, after the flow thereof is changed over by
the change-over valve 4 flows through the change-over passage 9
the influent passage 14 the holding chamber 15 the filler 17
the filter 12 the effluent passage 13 and the purified water outlet
11 in this order for treatment.
Since the purpose of water treatment is to obtain water which is
fit for drinking, it is necessary for the treated water to contain
mineral components at a concentration which is close to that of
natural water and to keep it near that value.
In other words, it is necessary for the mineral components to be
adequately soluble in the water which passes through the purifier
so that the treated water always contains more than a certain amount
of mineral components. When supply of water to the purifier is stopped,
however, it is essential that the mineral components are not dissolved
in the water held near the film 19 of mineral components to an excessive
Preferably, water having, for example, a hardness of 50 mg/l is
treated such as to have a hardness ranging between 70 and 150 mg/l,
so that it is fit for drinking.
The above-described water purifying material 17 can satisfy these
conditions, and the following describes how this is realized. When
water fills the water purifying material, the water filling the
pores 20 of the active carbon C contains mineral components in a
saturated state, and the mineral components contained in this water
dissolve in treated water by virtue of diffusion. The mineral components,
however, are restricted from diffusing freely because of the presence
of the fluidic film 21 which is provided on the periphery of the
active carbon C grains, and which provides resistance against diffusion
of mineral components. When there is only stagnant water present
in the purifier, this resistance of the film 21 becomes very large,
allowing only a small amount of mineral components to pass through
this film 21 thereby preventing the concentration of the mineral
components in the treated water from becoming high. On the other
hand, while water is passing through the purifier, the flow of water
reduces the diffusion resistance of the fluidic film 21 and the
mineral components contained in the water filling the pores 20 are
easily diffused, thereby preventing the lowering of the mineral
concentration of the water treated by this purifier.
Further, the active carbon C has many pores 20 each having a size
of about several tens .ANG., and the pores 20 have a large surface
area as well as a volume which is sufficient for providing an adequate
amount of the mineral components which diffuse from these pores
Additionally, since the substance 18 of the above described water
purifying material 17 is itself made of active carbon C which is
itself capable of removing chlorine and other impurities in water
which impair its taste and odor, another medium need not be provided
specifically for the purpose of filtration. This means that the
water purifier of this embodiment need only to employ a single water
purifying material, and therefore makes the structure of the cartridge
6 simple, as well as making its production easy.
The mineral components employed in this embodiment can, in addition
to the above-described calcium carbonate and sodium carbonate, also
include, for example, calcium bicarbonate, magnesium carbonate and
According to the present invention, it is possible to provide a
water purifier which is capable of treating water by removing chlorine
and the like, and at the same time which is so improved as to supply
mineral components which are soluble in treated water within a controlled