U.S. patent number 3,893,307 [Application Number 05/466,684] was granted by the patent office on 1975-07-08 for refrigerator freezer with frost eliminator.
This patent grant is currently assigned to General Motors Corporation. Invention is credited to James W. Jacobs.
United States Patent |
3,893,307 |
Jacobs |
July 8, 1975 |
**Please see images for:
( Certificate of Correction ) ** |
Refrigerator freezer with frost eliminator
Abstract
A refrigerator-freezer having a forced air circulation system
wherein the air is cooled by the evaporator and circulated by fan
means to and from side-by-side refrigerator and freezer
compartments. Control means maintain the air in the refrigerator
compartment above 32.degree. F. and the air in the freezer
compartment below 32.degree. F., and duct means, including a
Venturi nozzle, are provided for combining the air flows in the
freezer compartment such that moisture in the return air from the
compartments is frozen into crystallized water while airborne by
refrigerated air diverted from the evaporator chamber outlet. The
crystallized water is separated therefrom while airborne prior to
the combined air flows returning to the evaporator. Collecting
means are provided for melting and evaporating the water outside of
the freezer compartment.
Inventors: |
Jacobs; James W. (Dayton,
OH) |
Assignee: |
General Motors Corporation
(Detroit, MI)
|
Family
ID: |
23852709 |
Appl.
No.: |
05/466,684 |
Filed: |
May 3, 1974 |
Current U.S.
Class: |
62/150; 62/186;
62/272; 62/441; 62/156; 62/187; 62/419 |
Current CPC
Class: |
F25D
21/14 (20130101); F25D 17/065 (20130101); F25D
17/045 (20130101); F25D 2317/0683 (20130101); F25D
2400/06 (20130101); F25D 2321/1412 (20130101) |
Current International
Class: |
F25D
17/06 (20060101); F25D 21/14 (20060101); F25D
17/04 (20060101); F25d 021/00 () |
Field of
Search: |
;62/150,151,156,186,187,419 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wye; William J.
Attorney, Agent or Firm: Barthel; Edward P.
Claims
I claim:
1. A refrigerator comprising an insulated cabinet, an insulated
vertical partition wall extending from top to bottom of said
cabinet to provide separate vertical side-by-side fresh food and
frozen food compartments, an upright evaporator chamber associated
with the frozen food compartment rear wall containing an
evaporator, a fan having an inlet connected to said evaporator
chamber and having an outlet connected to both an upwardly
extending cold air supply duct and a downwardly extending
evaporator cold air diverter duct, a Venturi mixing nozzle located
in said diverter duct, a frozen food compartment air return duct
positioned in spaced relation around the lower portion of said
diverter duct having its inlet disposed vertically below said fan,
said air return duct defining a mixing chamber between the exit of
said diverter duct and the bottom wall of said frozen food
compartment, said cold air supply duct having an outlet for
discharging part of the cold air therethrough, a crossover duct
extending through the upper portion of said partition wall and
having an air inlet communicating with said cold air supply duct
and having an outlet for discharging a portion of the cold air into
said fresh food compartment, thermostatically controlled damper
means for controlling the flow of air from said crossover duct
outlet to said fresh food compartment, passage means for returning
air from the lower portion of said fresh food compartment to the
throat portion of said Venturi nozzle, whereby below freezing
diverter duct air flowing downwardly through said Venturi nozzle
draws above freezing air from said fresh food compartment through
said passage means into said throat for mixture with said air
therewith, said air return duct having an outlet communicating with
both subjacent crystallized water collecting means and the inlet of
said evaporator chamber, whereby moisture in the combined return
air is frozen by the diverter duct air flow while airborne, and
means for separating the crystallized water from the combined
return air during its flow from said mixing chamber for deposit
into said collecting means prior to the combined return air flows
being drawn upwardly into said evaporator chamber to minimize the
formation of frost on said evaporator.
2. A refrigerator comprising an insulated cabinet, an insulated
vertical partition wall extending from top to bottom of said
cabinet to provide separate vertical side-by-side fresh food and
frozen food compartments, an upright evaporator chamber associated
with the frozen food compartment rear wall containing an upright
evaporator, a single fan positioned about midway between the upper
and lower walls of said frozen food compartment and having an inlet
connected to said evaporator chamber and having an outlet connected
to both an upwardly extending cold air supply duct and a downwardly
extending evaporator cold air diverter duct, a Venturi mixing
nozzle located in the lower portion of said diverter duct, a frozen
food compartment air return duct positioned in spaced heat transfer
relation surrounding the lower portion of said diverter duct having
its inlet disposed vertically below said fan and vertically above
said nozzle, said air return duct defining a mixing chamber between
the exit of said diverter duct and the bottom wall of said frozen
food compartment, said cold air supply duct having an outlet
adjacent the frozen food compartment top wall for discharging part
of the cold air therethrough, a crossover duct extending through
the upper portion of said partition wall and having an air inlet
communicating with said cold air supply duct and having an outlet
for discharging a portion of the cold air into said fresh food
compartment, a thermostatically controlled damper for controlling
the flow of air from said crossover duct outlet to said fresh food
compartment to maintain the air in said fresh food compartment
above 32.degree.F. and the air in said frozen food compartment
below 32.degree.F., a passage for returning air from the lower
portion of said fresh food compartment to the throat portion of
said Venturi nozzle, whereby below freezing diverter duct air
flowing downwardly through said Venturi nozzle draws above freezing
air from said fresh food compartment through said passage means
into said throat for mixture therewith, said air return duct having
an outlet communicating with both a subjacent crystallized water
receptacle in the frozen food compartment bottom wall and the inlet
of said evaporator chamber, whereby moisture in the combined return
air of both the fresh food and freezer food compartments is frozen
into crystallized water by the diverter duct air while airborne,
and snow comb means for separating the crystallized water from the
combined return air during its flow from said mixing chamber for
deposit into said receptacle prior to the combined return air flow
being drawn upwardly into said evaporator chamber so as to reduce
the formation of frost on said evaporator, and means for melting
and evaporating the water in an ambient environment outside said
frozen food compartment.
3. A refrigerator comprising an insulated cabinet, an insulated
vertical partition wall extending from top to bottom of said
cabinet to provide separate vertical side-by-side fresh food and
frozen food compartments, an upright evaporator chamber formed by a
divider plate spaced from the rear wall of said frozen food
compartment containing an evaporator with the plate extending
substantially from the midpoint of the bottom of said frozen food
compartment, said evaporator chamber defined in part by a vertical
evaporator chamber side wall located intermediate the frozen food
compartment liner side walls, the lower portion of said evaporator
chamber side wall below said evaporator sloped toward said
partition wall such that its free end terminates above a water
collecting trough formed in the bottom wall of said frozen food
compartment, said side wall free end terminating in a curled edge
having a plurality of comb-like teeth, fan housing and duct means
located in said evaporator chamber above said evaporator having an
inlet communicating therewith and having an outlet connected to
both an upwardly extending cold air supply duct and a downwardly
extending evaporator air diverter duct, said cold air supply duct
receiving approximately 80 percent and said diverter duct receiving
approximately 20 percent of the total flow from said evaporator
chamber, a Venturi mixing nozzle located in the lower portion of
said diverter duct, said diverter duct having its outlet spaced a
defined distance above said water collecting trough, an enlarged
frozen food compartment air return duct surrounding in spaced
relation the lower portion of said diverter duct, said sloped
portion of said evaporator side wall together with said partition
wall forming in part an air mixing chamber having a tapered cross
section to provide a streamlined flow of air through said teeth,
said cold air supply duct having an outlet adjacent the frozen food
compartment top wall for discharging the majority of the cold air
therethrough, a horizontal crossover duct extending through the
upper portion of said partition wall and having an air inlet
communicating with said supply duct and having an outlet for
discharging a minority of the cold air into said fresh food
compartment, thermostatically controlled damper means for
controlling the flow of air from said crossover duct outlet to said
fresh food compartment, passage means for returning air from the
lower portion of said fresh food compartment to the throat portion
of said Venturi nozzle, the diverter air flowing through said
Venturi nozzle drawing the fresh food compartment air through said
passage means into said throat for mixture therewith, said frozen
food compartment return air duct having its outlet defined in part
by said curled edge whereby the flow of return air is redirected
vertically upwardly to said evaporator while allowing gravitational
flow of crystallized water into said subjacent trough, whereby the
combined return air is predried prior to entering said evaporator
chamber to minimize the formation of frost on said evaporator.
Description
This invention relates to refrigeration apparatus and is directed
to a domestic refrigerator having above and below freezing
compartments whereby a large portion of the moisture from the air
before it passes over the evaporator is removed, thereby
substantially reducing the need to defrost the evaporator.
It is an object of this invention to provide improved refrigerating
apparatus comprising side-by-side frozen food and fresh food
chambers, a refrigeration system for cooling a quantity of air to
below-freezing by passing it through an evaporator flow chamber,
duct means dividing the quantity of cooled air into a first portion
and lesser second portion, subsequently dividing the first portion
into a third and lesser fourth portion, a blower system for
circulating the third portion in the freezer chamber and the fourth
portion in the fresh food chamber thereby raising the fourth
portion to a temperature above-freezing, duct means including a
Venturi nozzle for recombining the second and fourth portions in
the freezer chamber to below-freezing temperature, whereby moisture
is frozen or condensed in solid form while airborne; duct means for
subsequently recombining the third portion with the recombined
second and fourth portions to further reduce the temperature and
solidify additional moisture therefrom; and collecting means for
separating the solidified moisture from the air stream and
returning the recombined quantity to the evaporator chamber for
cooling.
Other features and advantages of the invention will be apparent
from the following description of one embodiment of the invention,
considered in conjunction with the accompanying drawings
wherein:
FIG. 1 is a semi-diametric front elevation of a refrigeration
apparatus embodying the invention, with the doors to the different
compartments omitted;
FIG. 2 is a vertical sectional view taken on the lines 2--2 of FIG.
1;
FIG. 3 is a fragmentary enlarged front elevational view with
portions broken away to facilitate illustration of the
invention;
FIG. 4 is a fragmentary vertical section view taken substantially
on the line 4--4 of FIG. 3;
FIG. 5 is a schematic diagram of a portion of the control circuit
illustrating the control of the optional frost melt assist heater
of the refrigeration apparatus, and
FIG. 6 is an enlarged view taken on line 6--6 of FIG. 3 of the
frozen moisture separating device.
Referring now to the drawings a refrigerator of the present
invention comprises an insulated cabinet 10, the outer shell of
which has top and bottom walls 12 and 14, sidewalls 16 and 17 and a
rear wall 18. The interior of the cabinet 10 has an upright
insulated center partition wall 20 which divides the interior into
an above-freezing temperature fresh food chamber or compartment 21
on the right and below-freezing temperature frozen food or freezer
compartment 22 on the left arranged in a side-by-side manner. The
compartments are closed by separate insulated doors as door 19
shown in FIG. 2 closing compartment 22.
The refrigeration of the compartments is effected by the flow of
the refrigerated air therethrough by a suitable air moving means
such as a blower. As shown in FIGS. 1 and 2 of the drawings between
the rear wall liner 23 and a forwardly spaced cover plate 24 there
is provided a centrifugal fan housing 25 having in its front wall
an inlet opening 26. Within the housing 25 is a centrifugal fan 27
driven by an electric motor 28 which protrudes from the rear wall
18. Extending downwardly from the fan housing at the rear of the
freezer compartment 22 is a first cold air evaporator flow chamber
30 defined in part by the liner rear wall 23 and evaporator cover
plate 32. Within the evaporator flow chamber 30, whose upper walls
29 converge to form inlet opening 26, is located a vertically
finned air-cooling refrigerant evaporator 33 of customary
construction.
As seen in FIG. 2 at the rear of the freezer compartment 22 there
is provided an inwardly offset spaced duct front wall 34, defining
an upwardly extending flow chamber or cold air supply duct 35
transversely defined between the liner side wall 31 and supply duct
side wall 36. The duct 35 communicates with an upwardly discharging
fan housing outlet 37 and terminates in a forwardly extending right
angle portion 38 of duct 35 defined between the liner top wall 39
and forwardly extending channel 40 having a plurality of exit
louvers 42 in order to provide exits for the cold air in the
horizontally disposed angle duct 38. The circulated air is
refrigerated by being passed in heat exchange relationship with the
fin and tube evaporator 33, which is suitably refrigerated by
conventional means, including a sealed motor-compressor unit 44. A
condenser 46 is located on the back wall of the refrigerator
cabinet between the cabinet rear wall 18 and an outer condenser
cover plate assembly 48. The motor-compressor 44 is connected via a
compressor refrigerant discharge line 52 to the condenser 46 while
supply restriction line 53 connects the outlet of the condenser to
the evaporator and suction return line 54 connects the evaporator
to the compressor inlet. The refrigeration apparatus functions in a
conventional manner to provide refrigerant fluid to the serpentine
tube portion 56 of the evaporator.
A portion of the air circulated by the centrifugal fan 27 is
divided or split off from the vertical delivery duct 35 into a
horizontally disposed cross-over duct assembly 62 comprising a
rectangular plastic tube which extends through the center partition
20 into the above-freezing compartment 21 adjacent the top wall 12.
The air exits the duct 62 and is diverted downwardly into the fresh
food compartment 21 by a cover member 63 spaced outwardly from the
liner rear wall 23 and suitably secured thereto. At the duct
discharge end 64 damper means in the form of a butterfly damper 65
is located and is controlled thermostatically in accordance with
the temperature of a thermostat bulb 66 located in compartment 21
so that the bulb is connected via tube 67 to bellows 68, which
operates damper 65, is responsive to the temperature of the air
therein. A conventional thermostat cold control is provided at 70
having bulb 69 adjacent evaporator 33 by tube 71 for regulating the
operation of motor-compressor 44 on a cooling demand cycle. The
discharge opening 64 may be louvered for directing the air from
duct 62 to the chamber 21.
As seen in FIG. 1, in evaporator air bleeder or diverter duct 73 is
branched or split off at exit duct 73 from the duct wall 36 for
directing a portion of the cold air exiting from the evaporator 33
vertically downwardly to a frost eliminator section generally
indicated at 76. Intermediate the duct exit 73 and the frost
eliminator section 76 there is located an air return opening 78 in
cover plate 23 for conveying the freezer compartment return air
into vertical passage means 80, formed by enlarged duct portion 81
which circumscribes or surrounds the lower portion of air return
duct 72, such that the return air is mixed or intermingled with the
evaporator return air at the exit end 82 of the freezer air return
duct 72.
As seen in FIGS. 1 and 3, an above-freezing air return passage is
provided at 84 extending through a lower portion of the center
partition wall 20. The passage 84 provides a fourth air return duct
interconnecting the fresh food compartment 21 with the throat
portion 86 of a vertically oriented Venturi mixing nozzle 88
located in the lower portion of the air return from the evaporator
or second air return duct 72. The Venturi nozzle 88 has its upper
converging portion or cone air entrance 90 positioned to receive a
portion of the freezer air therein for discharge from lower
diverging portion or cone air exit 92 such that an aspirator effect
or predetermined suction is created at the throat 86 to aid in
drawing above-freezing spent air from compartment 21 for mixture in
the Venturi axial passage with the below-freezing third evaporator
air return entering third entrance 78 and exiting at 82 from the
third frozen food compartment cold air return duct 81.
As best seen in FIG. 3, an air combining or mixing chamber 94 is
provided at the exit end 82 of enlarged return freezer air duct 81
disposed around the second bleeder air duct 72 in spaced relation
from the outer walls thereof and whose left hand wall 96 is
inwardly and downwardly sloped to exit 98 to provide a tapered
cross-section toward the exit 98 and insure a streamlined flow of
air through separator 100. The sloped wall 96 terminates in a
sharply and outwardly curved fluted edge to form crystallized water
separator means. In the preferred embodiment a snow comb separator
100 is provided with slotted openings 101 separating curved teeth
103 which as seen in FIG. 4 and FIG. 6 provide the centrifugal air
flow removal of crystallized frozen water formed from the mixing in
chamber 94 of the relatively moist above-freezing temperature air
returning from freezer compartment 22.
Snow or crystallized water subjacent collector means is provided in
the bottom wall 14 of the freezer compartment 22 and which in the
disclosed form is a trough or receptacle 102 set flush with the
bottom wall inner liner whose upper edge merges or blends with the
sloped liner wall 93 and vertical liner 106 such that the snow or
crystallized water comb separator is positioned in vertical
alignment above trough 102. It will be noted that a horizontally
disposed screen 108 is positioned adjacent the collector bottom
wall 110 and that melted snow in the collector will drain therefrom
through the drain tube 112 and check valve 114 (FIG. 1) into the
defrost water drain pan 116 positioned in an ambient environment
above the desuperheat coil 118 of the refrigeration system, where
it will be evaporated therefrom by the heat of the ambient air and
the desuperheat coil 118. The upright evaporator chamber 30 has a
lower sloped wall 93 to define an air inlet 95 through which the
air is drawn for passage over the upright evaporator 33.
As shown the wiring diagram of FIG. 5 of the optional frost melt
assist heater 150 is connected by conductor 151 from the supply
conductors L.sub.2 to a first fixed off-cycle or warm contact 152
of cold control thermostat 70. The cold control includes a switch
element 155 of the double throw type and normally connects through
fixed contact 156 and conductors 157, 158 to motor protector 160
and conductor 162 to freezer fan motor 28. The conductor 166
connects motor protector 160 to contact 168 of relay 170, while
relay contact 172 is connected via conductor 174 to capacitor 176
which is in turn connected by conductor 178 to compressor motor 180
and thence by conductor 182 to supply line L.sub.2. It will be
noted that center vertical mullion dryer 184 is connected via
conductors 186 and 157 to cold control contact 156 such that it is
energized only when the cold control element 155 contacts cold
contact 156 during the cooling or run cycle of the refrigerator
when the compressor motor 180 is running.
Additional heaters such as the butter conditioner 190 heater 191
and 192 are connected by slide switch 194 across the supply lines
L.sub.1, L.sub.2. Refrigerator lamps 196 are energized by lamp
switch 198 while freezer lamp 200 is energized by lamp switch
202.
As one example of a typical air flow distribution cycle for the
disclosed form of the invention wherein the fan 27 delivers about
55 cfm of cold air flows from the evaporator chamber 30. Of the
total about 45 cfm of air or approximately 80 percent of the flow
enters duct 35 and about 10 cfm or approximately 20 percent of the
air flow is diverted into the inlet 73 of the bleeder duct 72. Of
the 45 cfm in duct 35 about 40 cfm or approximately 70 percent of
the air flow exits the freezer outlet 42 and about 5 cfm or
approximately 10 percent of the air flow enters into the crossover
duct 62 for exit from fresh food chamber outlet 64 with the damper
65 in its open position. It will be noted that the damper 65 can be
operated by any suitable means such as by a rack and pinion
arrangement (not shown) controlled by the fluid motor bellows 68 as
shown in U.S. Pat. No. 3,070,973 to J. J. O'Connell and assigned to
the assignee of the instant invention. In this way the 70 percent
of the evaporator air exiting outlet 42 enters freezer compartment
air return inlet 78 while the 5 cfm of the cold air cools the fresh
food compartment 21 and exits through return passage 84 into the
throat of nozzle 88 for combining with the 10 cfm of bleeder air.
The combined 15 cfm of mixed bleeder air and above freezing air
exits at 83 to mix with the 40 cfm of frozen food compartment
freezer air in chamber 94 whereby frozen crystals of moisture
formed by the air mixture is settled or separated out by gravity
and comb separator 100 into collector trough 102 such that about 55
cfm of substantially moisture free predried air is drawn into the
evaporator chamber 30 via its diverging entrance 95.
While the embodiment of the present invention as herein disclosed
constitutes a preferred form, it is to be understood that other
forms might be adopted.
* * * * *