U.S. patent application number 17/204180 was filed with the patent office on 2022-09-22 for refrigerator appliance with improved produce storage.
The applicant listed for this patent is Haier US Appliance Solutions, Inc.. Invention is credited to Mirza Yaseen Baig, Abhiruth Mohan.
Application Number | 20220299251 17/204180 |
Document ID | / |
Family ID | 1000005511503 |
Filed Date | 2022-09-22 |
United States Patent
Application |
20220299251 |
Kind Code |
A1 |
Mohan; Abhiruth ; et
al. |
September 22, 2022 |
REFRIGERATOR APPLIANCE WITH IMPROVED PRODUCE STORAGE
Abstract
A method of operating a refrigerator appliance includes
monitoring humidity within a food storage compartment of the
refrigerator appliance and comparing the monitored humidity level
with a predetermined humidity threshold. In response to the
monitored humidity level dropping below the predetermined humidity
threshold, a mist of water is sprayed into the food storage
compartment for a predetermined spraying time. The method also
includes activating an ultraviolet light source to direct
ultraviolet light into the food storage compartment for a
predetermined lighting time. At least a portion of the
predetermined lighting time is concurrent with the predetermined
spraying time. The method also includes waiting a predetermined
rest time before repeating the step of spraying the mist of water
into the food storage compartment in response to the monitored
humidity level below the predetermined humidity threshold.
Inventors: |
Mohan; Abhiruth; (Kerala,
IN) ; Baig; Mirza Yaseen; (Hyderabad, IN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Haier US Appliance Solutions, Inc. |
Wilmington |
DE |
US |
|
|
Family ID: |
1000005511503 |
Appl. No.: |
17/204180 |
Filed: |
March 17, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F25D 13/04 20130101;
F24F 8/22 20210101; F25D 17/02 20130101 |
International
Class: |
F25D 13/04 20060101
F25D013/04; F25D 17/02 20060101 F25D017/02; F24F 8/22 20060101
F24F008/22 |
Claims
1. A refrigerator appliance defining a vertical direction, a
lateral direction, and a transverse direction, the vertical,
lateral, and transverse directions being mutually perpendicular,
the refrigerator appliance comprising: a cabinet defining a food
storage chamber, the food storage chamber extending between a top
portion and a bottom portion along the vertical direction, a first
side portion and a second side portion along the lateral direction,
and a front portion and a back portion along the transverse
direction; a drawer slidably mounted within the food storage
chamber, the drawer comprising a plurality of walls defining a food
storage compartment; a spray nozzle in fluid communication with the
food storage compartment, the spray nozzle configured to direct a
mist of water into the food storage compartment; a humidity sensor
positioned and configured to monitor a humidity level within the
food storage compartment; an ultraviolet light source in optical
communication with the food storage compartment, the ultraviolet
light source configured to direct ultraviolet light into the food
storage compartment; and a controller, the controller in operative
communication with the spray nozzle, the humidity sensor, and the
ultraviolet light source, the controller configured for:
continually monitoring, with the humidity sensor, the humidity
level in the food storage compartment; comparing the monitored
humidity level with a predetermined humidity threshold; spraying a
mist of water into the food storage compartment from the spray
nozzle for a predetermined spraying time when the monitored
humidity level is less than the predetermined humidity threshold;
activating the ultraviolet light source for a predetermined
lighting time, wherein at least a portion of the predetermined
lighting time is concurrent with the predetermined spraying time;
waiting for a predetermined rest time after the end of the
predetermined spraying time; and repeating the step of spraying the
mist of water into the food storage compartment from the spray
nozzle for the predetermined spraying time when the monitored
humidity level is less than the predetermined humidity threshold
after the predetermined rest time.
2. The refrigerator appliance of claim 1, wherein the drawer
comprises a vent aperture in one wall of the plurality of walls and
wherein the vent aperture is unobstructed.
3. The refrigerator appliance of claim 1, wherein the predetermined
rest time is proportional to the average volume of water droplets
produced by the spray nozzle during the predetermined spraying
time, whereby the water from the step of spraying the mist of water
evaporates completely during the predetermined rest time.
4. The refrigerator appliance of claim 1, wherein the predetermined
spraying time is a constant value.
5. The refrigerator appliance of claim 1, wherein the controller is
further configured for identifying a food item and wherein the
predetermined spraying time is variable based on the identified
food item.
6. The refrigerator appliance of claim 5, further comprising a
camera, wherein the controller is configured for identifying the
food item based on an image captured by the camera.
7. The refrigerator appliance of claim 1, wherein the controller is
further configured for detecting an opening of a door and pausing
the spraying of the mist of water into the food storage compartment
in response to detecting the opening of the door during the
predetermined spraying time.
8. The refrigerator appliance of claim 7, wherein the controller is
further configured for returning to the step of comparing the
monitored humidity level with the predetermined humidity threshold
after detecting a closing of the door after pausing the spraying of
the mist of water into the food storage compartment in response to
detecting the opening of the door during the predetermined spraying
time, and wherein the controller is further configured for spraying
the mist of water into the food storage compartment from the spray
nozzle for a remainder of the predetermined spraying time when the
monitored humidity level is less than the predetermined humidity
threshold after detecting the closing of the door.
9. The refrigerator appliance of claim 8, wherein the controller is
further configured for waiting for a predetermined period of time
to elapse after detecting the closing of the door and before
returning to the step of comparing the monitored humidity level
with the predetermined humidity threshold.
10. A method of operating a refrigerator appliance, the
refrigerator appliance comprising a cabinet defining a food storage
chamber and a drawer slidably mounted within the food storage
chamber, the drawer comprising a plurality of walls defining a food
storage compartment, the method comprising: continually monitoring,
with a humidity sensor positioned and configured to monitor a
humidity level within the food storage compartment, the humidity
level in the food storage compartment; comparing the monitored
humidity level to a predetermined humidity threshold; spraying a
mist of water into the food storage compartment from a spray nozzle
in fluid communication with the food storage compartment, the spray
nozzle configured to direct a mist of water into the food storage
compartment, for a predetermined spraying time when the monitored
humidity level is less than the predetermined humidity threshold;
activating an ultraviolet light source in optical communication
with the food storage compartment, the ultraviolet light source
configured to direct ultraviolet light into the food storage
compartment, for a predetermined lighting time, wherein at least a
portion of the predetermined lighting time is concurrent with the
predetermined spraying time; waiting for a predetermined rest time
after the end of the predetermined spraying time; and repeating the
step of spraying the mist of water into the food storage
compartment from the spray nozzle for the predetermined spraying
time when the monitored humidity level is less than the
predetermined humidity threshold after the predetermined rest
time.
11. The method of claim 10, wherein the drawer comprises a vent
aperture in one wall of the plurality of walls and wherein the vent
aperture is unobstructed.
12. The method of claim 10, wherein the predetermined rest time is
proportional to the average volume of water droplets produced by
the spray nozzle during the predetermined spraying time, whereby
the water from the step of spraying the mist of water evaporates
completely during the predetermined rest time.
13. The method of claim 10, wherein the predetermined spraying time
is a constant value.
14. The method of claim 10, further comprising identifying a food
item and wherein the predetermined spraying time is variable based
on the identified food item.
15. The method of claim 14, wherein the refrigerator appliance
further comprises a camera, wherein the step of identifying the
food item comprises identifying the food item based on an image
captured by the camera.
16. The method of claim 10, further comprising detecting an opening
of a door and pausing spraying the mist of water into the food
storage compartment in response to detecting the opening of the
door during the predetermined spraying time.
17. The method of claim 16, further comprising returning to the
step of comparing the monitored humidity level with the
predetermined humidity threshold after detecting a closing of the
door after pausing the spraying of the mist of water in response to
detecting the opening of the door during the predetermined spraying
time, and further comprising spraying the mist of water into the
food storage compartment from the spray nozzle for a remainder of
the predetermined spraying time when the monitored humidity level
is less than the predetermined humidity threshold after detecting
the closing of the door.
18. The method of claim 17, further comprising waiting for a
predetermined period of time to elapse after detecting the closing
of the door and before returning to the step of comparing the
monitored humidity level with the predetermined humidity threshold.
Description
FIELD OF THE INVENTION
[0001] The present subject matter relates generally to refrigerator
appliances, and more particularly to systems and methods for
providing improved shelf life for produce items stored in such
refrigerator appliances.
BACKGROUND OF THE INVENTION
[0002] Refrigerator appliances generally include a cabinet that
defines a chilled chamber. A wide variety of food items may be
stored within the chilled chamber. The low temperature of the
chilled chamber relative to ambient atmosphere assists with
increasing a shelf life of the food items stored within the chilled
chamber.
[0003] Vegetables stored in a refrigerator appliance lose weight
over time, in particular due to loss of water. However, storing the
vegetables in an environment, e.g., inside a vegetable drawer, with
higher humidity relative to the remainder of the chilled chamber
may also entail reduced air circulation within the compartment in
which the vegetables are stored. Such reduced air circulation may
lead to foul smells developing within the compartment.
[0004] Accordingly, a refrigerator with features for extending the
shelf life of produce, in particular, vegetables, would be
useful.
BRIEF DESCRIPTION OF THE INVENTION
[0005] Aspects and advantages of the invention will be set forth in
part in the following description, or may be apparent from the
description, or may be learned through practice of the
invention.
[0006] In an exemplary embodiment, a refrigerator appliance is
provided. The refrigerator appliance defines a vertical direction,
a lateral direction, and a transverse direction. The vertical,
lateral, and transverse directions are mutually perpendicular. The
refrigerator appliance includes a cabinet defining a food storage
chamber. The food storage chamber extends between a top portion and
a bottom portion along the vertical direction, between a first side
portion and a second side portion along the lateral direction, and
between a front portion and a back portion along the transverse
direction. The refrigerator appliance also includes a drawer
slidably mounted within the food storage chamber. The drawer
includes a plurality of walls defining a food storage compartment.
The refrigerator appliance also includes a spray nozzle in fluid
communication with the food storage compartment. The spray nozzle
is configured to direct a mist of water into the food storage
compartment. The refrigerator appliance further includes a humidity
sensor positioned and configured to monitor a humidity level within
the food storage compartment. The refrigerator appliance also
includes an ultraviolet light source in optical communication with
the food storage compartment. The ultraviolet light source is
configured to direct ultraviolet light into the food storage
compartment. The refrigerator appliance further includes a
controller. The controller is in operative communication with the
spray nozzle, the humidity sensor, and the ultraviolet light
source. The controller is configured for continually monitoring,
with the humidity sensor, the humidity level in the food storage
compartment and comparing the monitored humidity level with a
predetermined humidity threshold. The controller is also configured
for spraying a mist of water into the food storage compartment from
the spray nozzle for a predetermined spraying time when the
monitored humidity level is less than the predetermined humidity
threshold. The controller is further configured for activating the
ultraviolet light source for a predetermined lighting time. At
least a portion of the predetermined lighting time is concurrent
with the predetermined spraying time. The controller is also
configured for waiting for a predetermined rest time after the end
of the predetermined spraying time and repeating the step of
spraying the mist of water into the food storage compartment from
the spray nozzle for the predetermined spraying time when the
monitored humidity level is less than the predetermined humidity
threshold after the predetermined rest time.
[0007] In another exemplary embodiment, a method of operating a
refrigerator appliance is provided. The refrigerator appliance
includes a cabinet defining a food storage chamber and a drawer
slidably mounted within the food storage chamber. The drawer
includes a plurality of walls defining a food storage compartment.
The refrigerator appliance also includes a humidity sensor
positioned and configured to monitor a humidity level within the
food storage compartment, and the method includes continually
monitoring, with the humidity sensor, the humidity level in the
food storage compartment and comparing the monitored humidity level
to a predetermined humidity threshold. The method also includes
spraying a mist of water into the food storage compartment from a
spray nozzle in fluid communication with the food storage
compartment. The spray nozzle is configured to direct a mist of
water into the food storage compartment. The mist of water is
sprayed into the food storage compartment for a predetermined
spraying time when the monitored humidity level is less than the
predetermined humidity threshold. The method also includes
activating an ultraviolet light source in optical communication
with the food storage compartment. The ultraviolet light source is
configured to direct ultraviolet light into the food storage
compartment. The ultraviolet light source is activated for a
predetermined lighting time, and at least a portion of the
predetermined lighting time is concurrent with the predetermined
spraying time. The method further includes waiting for a
predetermined rest time after the end of the predetermined spraying
time, and repeating the step of spraying the mist of water into the
food storage compartment from the spray nozzle for the
predetermined spraying time when the monitored humidity level is
less than the predetermined humidity threshold after the
predetermined rest time.
[0008] These and other features, aspects and advantages of the
present invention will become better understood with reference to
the following description and appended claims. The accompanying
drawings, which are incorporated in and constitute a part of this
specification, illustrate embodiments of the invention and,
together with the description, serve to explain the principles of
the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] A full and enabling disclosure of the present invention,
including the best mode thereof, directed to one of ordinary skill
in the art, is set forth in the specification, which makes
reference to the appended figures.
[0010] FIG. 1 provides a front view of a refrigerator appliance
according to an exemplary embodiment of the present subject
matter.
[0011] FIG. 2 provides a perspective view of the refrigerator
appliance of FIG. 1.
[0012] FIG. 3 provides a front view of the refrigerator appliance
of FIG. 1 with doors thereof in an open position.
[0013] FIG. 4 provides a front view of a portion of a refrigerator
appliance according to one or more exemplary embodiments of the
present subject matter.
[0014] FIG. 5 provides a section view of the portion of the
refrigerator appliance of FIG. 4.
[0015] FIG. 6 provides a front view of a portion of a refrigerator
appliance according to one or more additional embodiments of the
present subject matter.
[0016] FIG. 7 provides a section view of the portion of the
refrigerator appliance of FIG. 6.
[0017] FIG. 8 provides a perspective view of a drawer which may be
incorporated into a refrigerator appliance in one or more exemplary
embodiments of the present subject matter.
[0018] FIG. 9 provides a flow diagram of an exemplary method for
operating a refrigerator appliance according to one or more
exemplary embodiments of the present subject matter.
DETAILED DESCRIPTION
[0019] Reference now will be made in detail to embodiments of the
invention, one or more examples of which are illustrated in the
drawings. Each example is provided by way of explanation of the
invention, not limitation of the invention. In fact, it will be
apparent to those skilled in the art that various modifications and
variations can be made in the present invention without departing
from the scope or spirit of the invention. For instance, features
illustrated or described as part of one embodiment can be used with
another embodiment to yield a still further embodiment. Thus, it is
intended that the present invention covers such modifications and
variations as come within the scope of the appended claims and
their equivalents.
[0020] FIG. 1 is a front view of an exemplary embodiment of a
refrigerator appliance 100. FIG. 2 is a perspective view of the
refrigerator appliance 100. FIG. 3 is a front view of the
refrigerator appliance 100 with fresh food doors 128 thereof in an
open position. Refrigerator appliance 100 extends between a top 101
and a bottom 102 along a vertical direction V. Refrigerator
appliance 100 also extends between a first side 105 and a second
side 106 along a lateral direction L. As shown in FIG. 2, a
transverse direction T may additionally be defined perpendicular to
the vertical and lateral directions V and L. Refrigerator appliance
100 extends along the transverse direction T between a front
portion 108 and a back portion 110.
[0021] Refrigerator appliance 100 includes a cabinet or housing 120
defining an upper fresh food chamber 122 (FIG. 3) and a lower
freezer chamber or frozen food storage chamber 124 arranged below
the fresh food chamber 122 along the vertical direction V. In some
embodiments, an auxiliary food storage chamber (not shown) may be
positioned between the fresh food storage chamber 122 and the
frozen food storage chamber 124, e.g., along the vertical direction
V. Because the frozen food storage chamber 124 is positioned below
the fresh food storage chamber 122, refrigerator appliance 100 is
generally referred to as a bottom mount refrigerator. In the
exemplary embodiment, housing 120 also defines a mechanical
compartment (not shown) for receipt of a sealed cooling system (not
shown). Using the teachings disclosed herein, one of skill in the
art will understand that the present invention can be used with
other types of refrigerators (e.g., side-by-sides) or a freezer
appliance as well. Consequently, the description set forth herein
is for illustrative purposes only and is not intended to limit the
invention in any aspect.
[0022] Refrigerator doors 128 are each rotatably hinged to an edge
of housing 120 for accessing fresh food chamber 122. It should be
noted that while two doors 128 in a "French door" configuration are
illustrated, any suitable arrangement of doors utilizing one, two
or more doors is within the scope and spirit of the present
disclosure. A freezer door 130 is arranged below refrigerator doors
128 for accessing freezer chamber 124. In the exemplary embodiment,
freezer door 130 is coupled to a freezer drawer (not shown)
slidably mounted within freezer chamber 124. An auxiliary door 127
may be coupled to an auxiliary drawer (not shown) which is slidably
mounted within the auxiliary chamber (not shown).
[0023] Operation of the refrigerator appliance 100 can be regulated
by a controller 134 that is operatively coupled to a user interface
panel 136. User interface panel 136 provides selections for user
manipulation of the operation of refrigerator appliance 100 to
modify environmental conditions therein, such as temperature
selections, etc. In some embodiments, user interface panel 136 may
be proximate a dispenser assembly 132. Panel 136 provides
selections for user manipulation of the operation of refrigerator
appliance 100 such as, e.g., temperature selections, selection of
automatic or manual override humidity control (as described in more
detail below), etc. In response to user manipulation of the user
interface panel 136, the controller 134 operates various components
of the refrigerator appliance 100. Operation of the refrigerator
appliance 100 can be regulated by the controller 134, e.g.,
controller 134 may regulate operation of various components of the
refrigerator appliance 100 in response to programming and/or user
manipulation of the user interface panel 136.
[0024] The controller 134 may include a memory and one or more
microprocessors, CPUs or the like, such as general or special
purpose microprocessors operable to execute programming
instructions or micro-control code associated with operation of
refrigerator appliance 100. The memory may represent random access
memory such as DRAM, or read only memory such as ROM or FLASH. In
one embodiment, the processor executes programming instructions
stored in memory. The memory may be a separate component from the
processor or may be included onboard within the processor. It
should be noted that controllers 134 as disclosed herein are
capable of and may be operable to perform any methods and
associated method steps as disclosed herein.
[0025] The controller 134 may be positioned in a variety of
locations throughout refrigerator appliance 100. In the illustrated
embodiment, the controller 134 may be located within the door 128.
In such an embodiment, input/output ("I/O") signals may be routed
between the controller and various operational components of
refrigerator appliance 100. In one embodiment, the user interface
panel 136 may represent a general purpose I/O ("GPIO") device or
functional block. In one embodiment, the user interface 136 may
include input components, such as one or more of a variety of
electrical, mechanical or electro-mechanical input devices
including rotary dials, push buttons, and touch pads. The user
interface 136 may include a display component, such as a digital or
analog display device designed to provide operational feedback to a
user. For example, the user interface 136 may include a touchscreen
providing both input and display functionality. The user interface
136 may be in communication with the controller via one or more
signal lines or shared communication busses.
[0026] As may be seen in FIG. 3, a plurality of food storage
elements, such as bins 138, shelves 142, and drawers 140 are
disposed within the fresh food storage chamber 122. As will be
described in more detail below, the drawers 140 may be configured
for storing produce, such as fruits and vegetables, and, in
particular, may be configured for providing improved shelf life of
the produce. For example, in some embodiments, the refrigerator
appliance may include two drawers 140, e.g., as illustrated in FIG.
3, one of which is a vegetable drawer and the other is a fruit
drawer, also as will be described in more detail below.
[0027] Using the teachings disclosed herein, one of skill in the
art will understand that the present subject matter can be used
with other types of refrigerators such as a refrigerator/freezer
combination, side-by-side, bottom mount, compact, and any other
style or model of refrigerator appliance. Accordingly, other
configurations of refrigerator appliance 100 could be provided, it
being understood that the configurations shown in the accompanying
FIGS. and the description set forth herein are by way of example
for illustrative purposes only.
[0028] Referring now to FIG. 8, an exemplary drawer 140 may include
a food storage compartment 144. The food storage compartment 144
may be defined by a plurality of walls of the drawer 140. For
example, the plurality of walls may include a front wall 146, a
back wall 148, a left wall 150, and a right wall 152. Directional
terms such as "left" and "right" are used herein with reference to
the perspective of a user standing in front of the refrigerator
appliance 100 to access items stored therein. One of the walls,
e.g., the front wall 146 as in the illustrated example embodiment
of FIG. 8, may include a vent aperture 154 defined in and through
the wall, e.g., the front wall 146. In such embodiments, the vent
aperture 154 may be unobstructed, for example, no shutter or slider
or other mechanism for fully or partially shutting the vent
aperture 154 may be provided. In particular, the drawer 140 may not
include a humidity control knob, slider, or lever which adjusts the
degree of openness of the vent aperture 154. The unobstructed vent
aperture 154 may advantageously provide increased air circulation
into and through the food storage compartment 144, thereby
preventing or reducing the formation and/or accumulation of foul
odors within the drawer 140. Moreover, as described in further
detail below, the humidity within the food storage compartment 144
may be controlled by a spraying system without the need to open or
close the vent aperture 154, e.g., while the vent aperture 154
remains fully open and unobstructed throughout the range of
humidity levels provided within the food storage compartment
144.
[0029] As illustrated in FIGS. 4 through 7, in various embodiments,
the refrigerator appliance 100 may include a spray nozzle 200 in
fluid communication with the food storage compartment 144. For
example, the spray nozzle 200 may be positioned and configured to
direct a mist of water 1000 (FIGS. 5 and 6) into the food storage
compartment 144. In such embodiments, the refrigerator appliance
100 may also include an ultraviolet (UV) light source 202 in
optical communication with the food storage compartment 144. For
example, the ultraviolet light source 202 may be positioned and
configured to direct ultraviolet (UV) light 1002 (FIGS. 5 and 6)
into the food storage compartment 144. In some embodiments, the
refrigerator appliance 100 may further include a humidity sensor
160 (FIGS. 5 and 7) positioned and configured to monitor a humidity
level within the food storage compartment 144.
[0030] Further, in at least some embodiments, the refrigerator
appliance 100 may include two drawers 140, e.g., a fruit drawer 140
and a vegetable drawer 140. As illustrated in FIGS. 4 through 7,
the spray nozzle 200 may be in fluid communication with the
vegetable drawer 140 in order to spray the mist of water 1000 into
the food storage compartment 144 thereof. In such embodiments, a
second UV light source 202 may be provided in optical communication
with the fruit drawer 140 to direct UV light 1002 into the food
storage compartment 144 of the fruit drawer 140, while the
refrigerator appliance 100 does not include a spray nozzle 200 in
direct fluid communication with the fruit drawer 140.
[0031] In particular embodiments, e.g., as illustrated in FIGS. 4
and 5, the spray nozzle 200 and the UV light source 202 may be
mounted on the cabinet 120. For example, the spray nozzle 200 and
the UV light source 202 may be mounted on an interior surface of a
back wall of the cabinet 120 facing forwards, e.g., towards the
front portion 108 of the refrigerator appliance 100 and, more
immediately, towards the back wall 148 (FIG. 8) of the drawer 140.
In such embodiments, the drawer 140 may include an aperture 156
which is aligned with the spray nozzle 200 in order to permit the
mist of water 1000 to enter the food storage compartment 144
through the aperture 156, e.g., as illustrated in FIG. 5.
Additionally, in such embodiments, the drawer 140, and in
particular the walls 146, 148, 150, and 152 thereof, may comprise
or consist of a suitable translucent material to permit the UV
light 1002 from the UV light source 202 to travel through, e.g.,
the back wall 148, into the food storage compartment 144 of each
drawer 140.
[0032] In additional exemplary embodiments, e.g., as illustrated in
FIGS. 6 and 7, the spray nozzle 200 and the UV light source 202 may
be mounted, e.g., clipped, to one or more of the shelves 142, such
as to an underside of a shelf 142 that is directly above the
drawer(s) 140. In such embodiments, the mist of water 1000 from the
spray nozzle 200 and the UV light 1002 from the one or more UV
light sources 202 may enter directly into the or each drawer 140.
For example, in such embodiments, the mist of water 1000 from the
spray nozzle 200 may travel directly and immediately from the spray
nozzle 200 into the vegetable drawer 140, e.g., without having to
pass through a wall of the drawer 140 or an aperture extending
through such wall. Also by way of example, in such embodiments, the
UV light 1002 from each UV light source 202 may travel directly and
immediately from each UV light source 202 into the respective fruit
drawer 140 or vegetable drawer 140.
[0033] In various embodiments, the UV light source 202 may be
deactivated when one or both of the doors 128 is or are opened. The
UV light source 202 may then be reactivated when both doors 128 are
closed. For example, the controller 134 may be operable to detect
the door(s) 128 opening and to deactivate the UV light source 202
in response to detecting that one or both doors 128 are open, and
to reactivate the UV light source 202 after detecting that both
doors 128 are closed.
[0034] Turning now to FIG. 9, embodiments of the present disclosure
may include a method 300 of operating a refrigerator appliance,
such as the exemplary refrigerator appliance 100 described above.
For example, the refrigerator appliance may include a controller
and a plurality of food storage drawers, as described above.
[0035] In some embodiments, the method 300 may include a step 310
of monitoring a humidity level within a food storage compartment,
such as the exemplary food storage compartment 144 defined within
drawer 140 as illustrated and as described above. Monitoring the
humidity level may be continuously performed in some embodiments.
The method 300 may then include a step 320 of determining whether
the monitored humidity level is less than a predetermined humidity
threshold. When the monitored humidity level is less than the
predetermined humidity threshold, the method 300 may, in some
embodiments, proceed from step 320 to a step 330 of spraying a mist
of water into the food storage compartment from a spray nozzle in
fluid communication with the food storage compartment for a
predetermined spraying time. For example, the step 320 may include
comparing the monitored humidity level to the predetermined
humidity threshold and the step 330 may be performed in response to
the monitored humidity level being less than the predetermined
humidity threshold.
[0036] As illustrated in FIG. 9, in some embodiments, the method
300 may also include a step 332 of activating an ultraviolet light
source in optical communication with the food storage compartment,
whereby ultraviolet light source directs ultraviolet light into the
food storage compartment, for a predetermined lighting time. Also
as illustrated in FIG. 9, the steps 330 and 332 may be performed
concurrently, such as at least a portion of the predetermined
lighting time may be concurrent with the predetermined spraying
time.
[0037] After the predetermined spraying time has ended, the method
300 may then proceed to a step 340 of waiting for a predetermined
rest time after the end of the predetermined spraying time before
returning to the step 320 of determining whether the monitored
humidity level is less than the predetermined humidity threshold.
Thus, the method 300 may, in some embodiments, repeat the step 330,
et seq., when and because the monitored humidity level is less than
the predetermined humidity threshold after the predetermined rest
time.
[0038] The predetermined rest time may be sufficient for the
sprayed water to evaporate from the food storage compartment, e.g.,
compartment 144 described above. Thus, the predetermined rest time
may be a function of, e.g., based at least in part on, the volume
of the food storage compartment. Additionally, the predetermined
rest time may also or instead be based at least in part on the
average droplet size, e.g., the average volume of water droplets,
produced by the spray nozzle. For example, the predetermined rest
time may be based on an evaporation rate of the sprayed or misted
water, and the predetermined rest time may be at least a minimum
time taken for the water droplets to evaporate, such as based on
the volume or mass (or both) of water that is sprayed into the food
storage compartment during the predetermined spraying time.
Further, the predetermined rest time, in combination with the
dehumidification cycle of the refrigerator appliance in at least
some embodiments, may be sufficient for the sprayed water to
completely evaporate from the food storage compartment.
[0039] In embodiments where at least a portion of the predetermined
lighting time is concurrent with the predetermined spraying time,
the combined effects of the water and the UV light may be
advantageous. For example, in such embodiments, the antimicrobial
and disinfecting efficacy of the UV light may be improved by the
presence of the water mist as compared to UV light alone.
[0040] In some embodiments, the predetermined spraying time may be
a constant value which does not change from one operation or
iteration to the next. In other embodiments, the predetermined
spraying time may be variable. For example, the predetermined
spraying time may vary based on an identity of the food item(s),
e.g., vegetable(s), placed within the food storage compartment. In
such embodiments, the method may also include and/or the
refrigerator appliance may further be configured for identifying a
food item and implementing or applying a value of the predetermined
spraying time that is based on the identified food item.
[0041] In some embodiments, identification of the food item may be
accomplished with a camera (not shown). For example, the
refrigerator appliance may include a camera, and the step of
identifying the food item may include identifying the food item
based on an image captured by the camera. In some embodiments, the
operation of the camera may be tied to the door opening, e.g., the
camera may be operable and configured to capture an image each time
the door is closed after detecting a door opening. The structure
and operation of cameras are understood by those of ordinary skill
in the art and, as such, the camera is not specifically illustrated
or described in further detail herein for the sake of brevity and
clarity. In such embodiments, the controller 134 of the
refrigerator appliance 100 may be configured for image-based
processing, e.g., to identify a food item based on an image of the
food item, e.g., a photograph of the food item taken with the
camera. For example, the controller 134 may be configured to
identify the food item by comparison of the image to a stored image
of a known or previously-identified food item.
[0042] In some embodiments, the method may also include detecting
an opening of a door and pausing spraying the mist of water into
the food storage compartment in response to detecting the opening
of the door during the predetermined spraying time. For example,
the ambient environment outside of and immediately around the
refrigerator appliance will generally be more humid than the
interior of the refrigerator appliance. As such, when the door is
opened, the humidity in the food storage compartment may increase
as a result of more humid air from outside the refrigerator
appliance coming in, e.g., the air from the ambient environment is
typically warmer than air within the refrigerator appliance and
when such air enters the food storage chamber, e.g., 122, the air
cools and condensation forms on surfaces within the food storage
chamber, such as on the cabinet walls, shelves, and/or the walls of
the drawer, including within the food storage compartment.
Accordingly, continued spraying of the mist of water may not be
needed during the time that the door of the refrigerator is open
and for at least some time period thereafter. As such, the method
may include waiting until after detecting a closing of the door
before resuming the humidity control operations. For example, the
method may include returning to the step of comparing the monitored
humidity level with the predetermined humidity threshold after
detecting the closing of the door after pausing the spraying of the
mist of water in response to detecting the opening of the door
during the predetermined spraying time. Moreover, when the method
resumes spraying after the door is closed (and after the humidity
level is again less than the predetermined humidity threshold), the
spraying may, in some embodiments, be performed for less than the
full amount of the predetermined spraying time. For example, rather
than completely restarting the spraying step, the mist of water may
be sprayed into the food storage compartment from the spray nozzle
for a remainder of the predetermined spraying time based on how
much of the predetermined spraying time had elapsed before the door
was opened. As an example, if the predetermined spraying time is X
seconds and the door is opened after Y seconds (Y is less than X),
then, after the door is closed and after the monitored humidity
level once again drops below the predetermined humidity threshold,
the mist of water will be sprayed into the food storage compartment
for X minus Y seconds, e.g., the remaining amount or portion of the
predetermined spraying time when the door was opened.
[0043] Additionally, in some embodiments, the method may also
include and/or the controller may also be configured for waiting
for a predetermined period of time to elapse after detecting the
closing of the door and before returning to the step of comparing
the monitored humidity level with the predetermined humidity
threshold. Waiting for the predetermined period of time to elapse
after detecting the closing of the door and before returning to the
step of comparing the monitored humidity level with the
predetermined humidity threshold may advantageously allow the
condensation process described above to complete, such that the
humidity reading used in the comparing step may thereby more
accurately reflect the influence of the outside air on the humidity
within the food storage compartment as compared to immediately
resuming the comparing step after the door closing is detected.
[0044] Those of ordinary skill in the art will recognize that the
present disclosure provides numerous advantages. For example,
providing the mist of water into the food storage compartment may
advantageously reduce or avoid wilting of vegetables therein,
thereby providing extended shelf life for the vegetables.
Additionally, the predetermined rest time may maintain the humidity
level within the vegetable drawer at or below a level which can
readily evaporate from the food storage compartment and allow time
for such evaporation to occur. The benefits resulting from such
rest time include eliminating the need to drain liquid water from
the food storage compartment and reducing or eliminating the
potential for bacteria growth in the food storage compartment.
Moreover, the combination of UV light with the mist spray in
particular may advantageously provide disinfection to the food
storage compartment within each produce drawer to ensure that the
fruits and vegetables therein are free from potentially harmful
microbes that might otherwise flourish on the surfaces of the
produce. It is to be understood that the UV light provides such
advantages in both the fruit drawer and the vegetable drawer, but
also that the combination of UV light and the mist of water in the
vegetable drawer provides enhances disinfection capability of the
UV light. The foregoing advantages are provided by way of example
only, those of ordinary skill in the art will recognize that
various embodiments of the present disclosure may also provide
additional advantages and/or that some embodiments of the present
disclosure may not necessarily provide each of the foregoing
exemplary advantages. As such, none of the example advantages
discussed in this paragraph are to be considered required or
mandatory features of the present disclosure.
[0045] This written description uses examples to disclose the
invention, including the best mode, and also to enable any person
skilled in the art to practice the invention, including making and
using any devices or systems and performing any incorporated
methods. The patentable scope of the invention is defined by the
claims, and may include other examples that occur to those skilled
in the art. Such other examples are intended to be within the scope
of the claims if they include structural elements that do not
differ from the literal language of the claims, or if they include
equivalent structural elements with insubstantial differences from
the literal languages of the claims.
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