Water purifier abstract
A water purifier for producing potable water from contaminated
water, the purifier includes a crystallizer chamber with a plurality
of projecting freeze elements, and a water spray unit which directs
a fine spray of water at the freeze elements to produce ice coating
on the freeze elements. The purifier also includes a refrigerant
unit to periodically chill and warm the freeze elements to alternately
produce and release ice shells that are melted to form purified
Water purifier claims
What is claimed is:
1. A water purifier comprising:
a crystallizer chamber having a plurality of freeze elements in
a water supply conduit having at least one fine spray nozzle directed
at said freeze elements;
a pressurized water supply means for delivering contaminated water
from a contaminated water source through said spray nozzle;
means for periodically chilling said freeze elements to a sub-freezing
temperature, when said water supply means directs a fine droplet
spray at said freeze elements;
means for periodically heating said freeze elements for releasing
ice shells accumulated on said freeze elements;
collection means for collecting ice shells released from said freeze
elements, wherein said crystallizer chamber has a pair of opposed
downwardly and outwardly sloping interior walls from which perpendicularly
project said plurality of freeze elements.
2. The water purifier of claim 1 wherein said collector includes
a melt unit for melting ice shells, and a water tank for holding
3. The water purifier of claim 2 wherein said means for periodically
chilling said freeze elements comprises a refrigerant unit including
a compressor for compressing a vaporized refrigerant and a condenser
for condensing compressed refrigerant.
4. The water purifier of claim 3 wherein said melt unit includes
a cooling means for cooling compressed refrigerant from said compressor.
5. The water purifier of claim 4 wherein said melt unit comprises
a melt shelf onto which ice shells from said freeze elements are
deposited, having a plurality of conduits through which compressed
refrigerant is passed.
6. The water purifier of claim 5 wherein said melt shelf has removable
cover means over an opening for passing ice shells through said
melt shelf, when said cover means is removed.
7. The water purifier of claim 1 wherein said means for heating
said freeze elements comprises a refrigerant unit including a compressor
for compressing a vaporized refrigerant and a condensor for condensing
compressed refrigerant, and an activatable bypass line for delivering
compressed warm refrigerant from said compressor to said freeze
8. The water purifier of claim 7 wherein said refrigerant unit
includes a supply line for delivering condensed refrigerant from
said condensor to said freeze elements and a suction line for delivering
vaporized refrigerant from said freeze elements to said compressor.
9. The water purifier of claim 8 wherein said means for heating
said freeze elements includes further an activatable bypass line
for drawing compressed warm refrigerant from said freeze elements
to said compressor.
10. The water purifier of claim 9 wherein said means for heating
said freeze elements includes a bypass supply between said condensed
refrigerant supply line and said activatable bypass line for passing
adequate refrigerant for effective compressor operation.
11. The water purifier of claim 1 wherein said crystallizer chamber
has a sloped bottom for runoff of water and released ice shells.
12. The water purifier of claim 11 wherein said sloped bottom is
downwardly directed to a gutter having a sloped cover grate for
separation of water and ice shells.
13. The water purifier of claim 12 wherein said gutter is directed
to a brine reservoir for recycling the water from said reservoir
to said spray nozzle.
14. The water purifier of claim 13 wherein said grate is directed
to a water collecting means for collecting and melting ice shells
for accumulation of purified water.
15. The water purifier of claim 14 wherein said collection means
includes a storage tan for storing accumulated purified water.
16. The water purifier of claim 15 wherein said storage tank includes
an auxilliary cooling unit for maintaining the tank water cool.
17. The water purifier of claim 1 wherein said pressurized water
supply means comprises a storage reservoir and a water pump for
delivering water from said storage reservoir to said spray nozzle
18. The water purifier of claim 17 wherein said storage reservoir
is connected by a supply line to an external water supply for supplementing
water in said storage reservoir.
19. The water purifier of claim 18 having a brine sump wherein
chilled brine is periodically discharged, said brine sump having
a heat exchange coil through which the external water passes for
20. The water purifier of claim 19 wherein said storage reservoir
has means for periodically discharging water from said reservoir
to said brine sump.
21. The water purifier of claim 20 wherein said discharge means
comprises a syphon.
22. The water purifier of claim 1 having auxilliary purifying means
for producing pure water.
23. The water purifier of claim 22 wherein said means comprises
an ultra violet unit.
24. The water purifier of claim 22 wherein said means comprises
a charcoal filter unit.
Water purifier description
BACKGROUND OF THE INVENTION
This invention relates to a device for purifying water and in particular
to a water crystallization type purifier in which pure ice crystals
are formed in a contaminated water. The ice crystals are separated
from the contaminated water and melted to provide a supply of pure
There are numerous methods of purifying water. Three primary methods
are practical for processing large quantities of contaminated source
water: distillation, electrodialysis and crystallization.
Distillation has had wide practical application in purifying contaminated
or salt waters. However, low temperature evaporation and condensation
of large quantities of water require extensive capital equipment
and substantial land areas for efficient operation. High temperature
vapor systems require abundant fuel supplies and pressurized heat
transfer systems that are subject to corrosion, scaling and failure.
In electrodialysis, two spaced permeable membranes selectively
pass positive and negative ions from a salt solution therebetween,
to electrodes on the other sides of the membrane. Generally size
and cost limitations restrict the use of electrodialysis to limited
volumes of mildly saline solutions.
Crystallization has been used in the past, but has had limited
application. Because of its advantages as a low temperature process,
problems of corrosion and scaling are minimal. Crystallization purification
has been used to desalinize sea waters. Both continuous and batch
processes have been used to produce quantities of water on large
and small scales. The relatively low energy requirement compared
to distillation and membrane dialysis makes crystallization an attractive
general method for producing purified water. While the principle
of purification through freezing has been well known, surprisingly
few practical applications of the principle have been implemented.
The water purifier of this invention utilizes a cyclical freeze
process to produce purified drinking water from a contaminated or
non potable water source. The water purifier employs a design concept
that is suitable for low volume purifiers for household use, or
high volume purifiers for industrial use. The concept is useable
for economical purification of water containing up to 4500 p.p.m.
of contaminants. Water having much higher concentrations of contaminants
can be purified by multiple passes through the purification system.
Sea water, for example, having 22900 p.p.m. of impurities, can
be purified by three passes to obtain potable water of high quality.
The devised water purifier uses a hybred spray process to produce
fine droplets that form ice crystals on a refrigerated contact surface.
As the ice crystals accumulate they are continually washed by the
unfrozen portion of the continuous spray. This process flushes away
a contaminated brine film that adheres to the surface of tiny platelets
of crystallizing ice. The ice cake that accumulates is periodically
removed and melted to provide a supply of pure water.
The hybred spray process was devised to incorporate certain phenomenae
reported from a prior investigation of water refrigerant mix systems.
In such systems the water is directly mixed with a refrigerant to
initiate crystallization from the vaporization of the refrigerant
from the water refrigerant mix. In the investigation of a technique
for mixing by colliding separate sprays of refrigerant and water,
a fine spray of freezing droplets is produced. The crystals formed
were substantially smaller than those produced by liquid mixtures
of a feedwater and a liquid refrigerant in a crystallizer. The smaller
the crystal the less likely that surface films become trapped between
the platelets of accumulating crystals.
While direct contact methods of water purification are suitable
for large volumes of water, the difficult process of separating
the ice crystals from the brine in the resulting slurry makes the
process impractical for smaller units. Additionally there is a reluctance
to directly mix water with a refrigerant when potable water is sought.
This disadvantage is obviated by the use of a heat transfer surface
separating the water from the refrigerant.
The problem with surface contact systems, however, is the added
cost of the heat transfer components and the additional energy consumption
required. In such units the surface is directly washed by a continuous
stream of contaminated water which transfers to the exchange surface
large amounts of latent heat acquired during a cycling process.
Because surface area is a primary limitation to efficient heat
transfer for large volumes of water, applicant has sought to maximize
the effective area by two means. First, the contact surface area
is increased by the use of a plurality of projecting, thimble-like
freeze elements. Second, the surface area of the water is increased
by projecting the water at the elements in a fine spray of small
droplets to enable rapid formation of seed crystals on contact with
the freeze elements or the ice cake formed thereon. The cold atmosphere
of the crystallizer aids in reducing the temperature of the droplets
close to the freeze temperature before impact. The impact of the
droplets has a wash effect, to purge contaminants on the crystals
as they accumulate on the freeze elements. Additionally the orientation
of the freeze elements allows the contaminated brine to effectively
drip from the end of the elements.
As the efficiency begins to diminish, because of ice buildup, the
freeze elements are warmed to release the capsules of caked ice.
The ice is then melted providing a supply of potable water.
SUMMARY OF THE INVENTION
The water purified of this invention uses a cyclical freeze process
to produce a potable water. The purifier has particular application
in changing a hard, highly-mineralized, tap water to a high-quality,
The purifier is constructed with a unique freeze chamber having
a plurality of projecting freeze elements. The finger-like freeze
elements substantially increase the effective area for heat transfer.
Further, the freeze elements are configured and oriented to provide
an effective drip surface allowing the contaminants accumulating
in the brine to be purged from the system.
Water from a supply source is pumped to the freeze chamber and
forced through spray nozzles directed at the freeze elements. The
fine spray, upon contact with the freeze elements, forms fine crystals
of pure ice. Unfrozen brine runs to the end of the freeze elements,
collecting contaminants forced to the surface of the forming platelets
of ice crystals. The brine drips to a reservoir where it is mixed
with makeup water for subsequent cycling to the freeze chamber.
Periodically, as the brine becomes concentrated, it is discharged,
and the reservoir refilled with source water.
The freeze elements are each equipped with internal refrigerant
for uniform accumulation of an ice pack on all of the elements.
When the ice pack has developed to a point that there is a notable
reduction in the efficiencies of the freeze elements, the crystallization
stage is stopped and a heated medium is supplied to the freeze elements
and onto a collector. The collector is preferably a heat exchanger
which can take advantage of the potential heat exchange with the
low temperature ice, for example, in cooling the supply water, or
in the preferred embodiment cooling the refrigerant from its heated
condition after the compression stage.
The pure water from the melting ice is collected in a storage tank
and delivered to a spigot for use. The cold waste is stored in a
waste sump having a heat exchange coil for cooling incoming supply
water. Overflow from the waste sump is discharged to a sewer drain.
Applicant has devised a hybred spray process that effectively conserves
the energies of the cycle and makes a surface contact system efficient
and economical. The process produces a water of high purity, using
a cycled operation as described with reference to the detailed description
of the preferred embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevational view, partially broken away of the
water purifier of this invention.
FIG. 2 is a side elevational view partially broken away of the
purifier of FIG. 1.
FIG. 3 is a cross sectional view taken on the lines 3--3 of FIG.
FIG. 4 is a schematic of the primary conduit circuits of the purifier.
FIG. 5 is a schematic of the primary electrical circuits of the
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIGS. 1 2 and 3 the preferred embodiment of the water
purifier is shown. The purifier unit 10 is sized for household or
restaurant use to produce a high quality drinking water from a highly
mineralized or contaminated water source. The unit described can
easily be increased in size for higher volume commercial and industrial
The unit 10 is constructed with an outer cabinet 12 which houses
most of the operational components for purifying water from an external
water supply. A front panel 14 is shown broken away in FIG. 1 to
reveal a compressor compartment 16 and a freeze compartment 18.
In the compressor compartment 16 is mounted a refrigerant compressor
20 which compresses a refrigerant gas, for example Freon, to the
pressure that it can be condensed by an air cooled condenser 21.
The condenser 21 is mounted externally to the cabinet 12 to maximize
circulation of air through the condenser 21 by an air fan 22 accompanying
the condenser. The condenser can be internally mounted in an oversized
cabinet where proper air circulation conduits are provided.
The compressor 20 draws expanded refrigerant gas through a suction
line 23 that is connected to an accumulator 24 which allows any
refrigerant condensate to vaporize. The accumulator 24 has a suction
line 25 that divides and connects to a series of manifolds 26. The
manifolds 26 are coupled to a plurality of individual freeze elements
27 which project into a crystallizer chamber 28 in the freeze compartment
18. The freeze elements 27 are supplied refrigerant from the condenser
through liquid refrigerant feed lines 30. The feed lines 30 have
a terminal end 32 within the freeze elements 27 proximate the projecting
end 33 of the element as shown in FIG. 4.
When the liquid refrigerant vaporizes within the freeze elements
27 the freeze elements are chilled. A fine spray of water is directed
at the freeze elements 27 from a plurality of spray nozzles 34 located
on a water tube 36. The water tube 36 is centrally positioned in
the crystallizer chamber 28 and connects to a water circulating
pump 38 located in the back of the purifier unit 10 as shown in
The crystallizer chamber 28 is constructed with an insulating polypopylene
shell 40 which has a pair of outwardly angled upper walls 42 to
orient the array of freeze elements 27 with downwardly angled projections
to allow effective run-off of the excess unfrozen brine. The water
spray allows sufficient local dwell on impact of the fine droplets
to cause seed crystals to form and adhere to the freeze elements
or ice pack which accumulates thereon.
The excess brine drips from the ends of the freeze elements 27
onto a polypropylene gable 44 at the bottom of the crystallize chamber
where it runs off the gable eaves 46 and into a pair of collector
gutters 48. The collector gutters are mounted along the lower edge
of the inwardly angled lower insulated walls 50 of the crystallizer
chamber 28 to collect any spray run-off from the crystallizer chamber
which does not contact the freeze elements. The collector gutters
48 drain into a water reservoir 54 for the circulating supply water.
The circulating pump 38 draws water from the supply reservoir 50
through a supply line 56 for delivery to the spray nozzle 34. Makeup
water is provided from the water source as required by action of
a float valve 58 at the end of the source line 59 which connects
to an external supply 61 when manual line valve 63 is open.
When a thick shell of ice has formed on the freeze elements 27
a hot gas bypass line 31 from compressor 20 is opened and hot refrigerant
gas enters the hollow freeze elements 27 causing them to warm melting
the surface ice and causing the ice shells to fall from the freeze
elements 27. The ice shells skid across the gable 44 and drop onto
sloped grates 62 covering the collector gutters for the brine. The
ice shells skid from the grates 62 to a melt shelf 64 located under
the crystallizer chamber. The melt shelf 64 is a stainless steel
hollow rack with conduits 65 through which the hot compressor gasses
are circulated before being fed to the condenser 21. The melt shelf
64 functions as a effective heat exchanger using the melting ice
to effectively cool the compressor gas before it is introduced into
the condenser 21 for final condensation to a liquid. The melt shelf
also provides pure water derived from the melting ice that is collected
in the storage tank 66 where it is drawn for use on activation of
a small delivery pump 68. Chilling for water in the purified water
storage tank is provided primarily by ice fragments which drop through
the rack. A central cover 69 FIG. 4 covering a gap in the rack
allows whole ice shells to fall into the tank when desired for warm
The freeze-release cycles are automatically continued until water
in the storage tank reaches a filled level where a float override
switch 70 deactivates the cycle. During the melt phase of the cycle,
water in the spray lines 36 drains back into the supply reservoir
54 raising the level to the syphon overflow line 71 causing the
water in the reservoir to drain completely, or to a level desired
by adjustment of a window sleeve 72 into a waste water sump 73.
The capacity of the supply water reservoir can be adjusted by inclusion
of select sized displacement ballast 74.
Several thermal conservation components are included to conserve
energy. The incoming supply water is prechilled by passing through
a coil 75 in the waste water sump 73 which holds the chilled waste
brine before final discharge through an overflow drain pipe 76 to
an axilliary sewer system 77.
Further, a heat sink 78 is connected to the compressor discharge
for immediate lowering of the hot compressor gasses. The heat sink
has an internal gas coil 79 with a water jacket 80 supplied by source
water on activation of a thermatic control valve 81 allowing excessively
heated water in the water jacket to be periodically purged to the
external sewer system 77.
Additionally, warm condensate from the condenser 21 is conveyed
through a coil 84 around the refrigerant accumulator 24 which collects
and vaporizes any refrigerant that precipitates before entry into
the compressor 20 and concurrently further cools the fluid refrigerant
before expansion in the freeze elements.
While the primary cycle itself uses compressor gases to heat the
freeze elements during the warming phase, and the released ice to
chill the compressor gas in the melt shelf in the cooling phase,
the cycle energies may not be sufficient to maintain the purified
water tank 66 at a cold temperature solely by ice fragments that
fall through the shelf, particularly when the tank is full and the
device is not cycling. Therefore, in a preferred embodiment an auxilliary
compressor 86 operably by a thermostatic control 87 provides a refrigerant
to a cooling coil 88 immersed in the storage tank 66.
Referring to FIGS. 4 and 5 the water purifier operates on a repeated
cycle to provide an adequate reservoir supply of water for use.
Once the master switch SW 1 is activated and the system operates
to continuously form and release ice thimbles which melt to fill
the reservoir 66 float 70 activates an overriding switch SW 2 to
break the circuit to cease the cycling.
An individual cycle is approximately 18 minutes comprising approximately
a 15 minute freeze segment where the compressor operates to provide
condensed refrigerant to the freeze elements 27. In this mode, solenoid
valve S-1 is open to allow return of the vaporized refrigerant to
the accumulator 24 and compressor 20 for recycling. As ice collects
on the freeze elements, the vaporized return refrigerant becomes
progressively lower in temperature. At a cycle set temperature,
sensed by T-1 in the suction line 25 a timer, TM is activated which
trips relay R-1 for a period of approximately 21/2 minutes to warm
the freeze elements and release the formed ice thimbles. The relay
automatically stops the circulating pump 38 without affecting the
manual override switch SW-3 and, stops the condensor fan motor
irrespective of the position of a thermostatic control switch SW-4
used as demand regulator to respond to the temperature of compressed
refrigerant gas fed to the condenser which may vary outside of the
ideal operating range between 110 and 130 degrees F. The relay R-1
also closes solenoid valve S-1 in the suction line 25 and opens
solenoid valve S-3 regulated by manual set valve V-1 connecting
the freeze elements 27 with a hot gas line 31 to deliver post compressor
gas to the freeze elements to cause immediate warming. In addition
the relay R-1 opens solenoid valve S-2 regulated by manuel set
valve V-2 to open line 60 to allow warm gases to be returned to
the compressor. Since the suction of the compressor may cause a
vacuum chilling of the freeze elements, because of insufficient
refrigerant return, a temperature controlled bypass valve, TXV,
shunts refrigerant from feed line 30 to closed suction line 25 to
provide refrigerant to the base of the freeze elements, allowing
sufficient refrigerant for effective operation of the compressor.
Bypass valve TXV is controlled by thermostat T-2 to prevent too
much refrigerant to enter the freeze element and cause a chilling.
The warm gases to the freeze elements allow the ice thimbles to
drop to the melt shelf 64 or where a center cover 67 is removed,
to drop to the water tank 66 where chilled purified water is desired.
When the timer TM has completed its phasing, the relay is deactivated
and the system returns to the freeze segment of the cycle.
The preferred purifier unit 10 is equipped with complimentary components
enhancing the unit for purified drinking water. To insure against
any bacterial growth, an ultra violet purifier unit 90 is installed
on the supply water line 92. Additionally, an activated charcoal
filter unit 94 and flow meter 96 are installed on the delivery line
98 for purified water. As added assurance, where water use may be
periodic, an additional ultra violet purifier unit 100 is installed
at the outlet line 102.
As an auxilliary service, filtered water may be made available
from the water purifier unit 10 by inclusion of a filter line 104
from the supply line 92 which includes an activated charcoal filter
unit 106 a water meter 108 and a supplemental ultra violet purifier
unit 110 before discharge from a common spigot 112.
Water may be selected by a coin operated selection box 114 as shown
in FIG. 1 having an internal timing circuit to activate the line
valve 116 for filtered water or supply pump 68 for purified water.
While in the foregoing embodiments of the present invention have
been set forth in considerable detail for the purposes of making
a complete disclosure of the invention, it may be apparent to those
of skill in the art that numerous changes may be made in such detail
without departing from the spirit and principles of the invention.