U.S. patent application number 14/805515 was filed with the patent office on 2017-01-26 for washing machine appliances and methods for washing articles therein.
The applicant listed for this patent is GENERAL ELECTRIC COMPANY. Invention is credited to John Joseph Roetker.
Application Number | 20170022648 14/805515 |
Document ID | / |
Family ID | 57836987 |
Filed Date | 2017-01-26 |
United States Patent
Application |
20170022648 |
Kind Code |
A1 |
Roetker; John Joseph |
January 26, 2017 |
WASHING MACHINE APPLIANCES AND METHODS FOR WASHING ARTICLES
THEREIN
Abstract
Washing machine appliances and methods for washing articles in
washing machine appliances are provided. A method includes flowing
a hot water volume into a tub, wherein the hot water volume is the
only water volume flowed at a hot temperature into the tub, and
performing an agitation cycle after flowing the hot water volume
into the tub and after a detergent and an additive have been added
to the tub. The method further includes draining water from the tub
after performing the agitation cycle, and flowing a cold water
volume into the tub after draining the water from the tub. The
method further includes draining water from the tub after flowing
the cold water volume into the tub, and performing an extraction
cycle after flowing the cold water volume into the tub and draining
the water from the tub.
Inventors: |
Roetker; John Joseph;
(Louisville, KY) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GENERAL ELECTRIC COMPANY |
Schenectady |
NY |
US |
|
|
Family ID: |
57836987 |
Appl. No.: |
14/805515 |
Filed: |
July 22, 2015 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
D06F 39/083 20130101;
D06F 2204/088 20130101; D06F 35/005 20130101; D06F 33/00 20130101;
D06F 35/007 20130101; D06F 39/088 20130101; D06F 2220/00
20130101 |
International
Class: |
D06F 35/00 20060101
D06F035/00; D06F 39/08 20060101 D06F039/08; D06F 33/02 20060101
D06F033/02 |
Claims
1. A method for washing articles in a washing machine appliance,
the washing machine appliance having a drum positioned within a
tub, the drum defining a wash chamber for receipt of articles for
washing, the method comprising: flowing a hot water volume into the
tub to a predetermined fill level, wherein the hot water volume is
the only water volume flowed at a hot temperature into the tub;
performing an agitation cycle for a predetermined time period after
flowing the hot water volume into the tub and after a detergent and
an additive have been added to the tub; draining water from the tub
after performing the agitation cycle; flowing a cold water volume
into the tub to a predetermined fill level after draining the water
from the tub; draining water from the tub after flowing the cold
water volume into the tub; and performing an extraction cycle for a
predetermined time period after flowing the cold water volume into
the tub and draining the water from the tub.
2. The method of claim 1, wherein performing the agitation cycle
comprises rotating the drum in the agitation cycle and wherein
performing the extraction cycle comprises rotating the drum in the
extraction cycle.
3. The method of claim 1, wherein the hot water volume is at a
temperature of between approximately 110 and approximately 130
degrees Fahrenheit.
4. The method of claim 1, wherein the predetermined time period for
performing the agitation cycle is between approximately 15 and
approximately 30 minutes.
5. The method of claim 1, wherein the cold water volume is at a
temperature of between approximately 50 and approximately 80
degrees Fahrenheit.
6. The method of claim 1, further comprising: flowing a cold water
volume into the tub after performing the agitation cycle and before
draining the water; and performing a subsequent agitation cycle for
a predetermined time period after flowing the cold water volume
into the tub and before draining the water.
7. The method of claim 6, wherein the predetermined time period for
performing the subsequent agitation cycle is between approximately
5 and approximately 15 minutes.
8. The method of claim 1, further comprising: flowing a subsequent
cold water volume into the tub to a predetermined fill level after
performing the extraction cycle; draining water from the tub after
flowing the subsequent cold water volume into the tub; and
performing a subsequent extraction cycle for a predetermined time
period after flowing the subsequent cold water volume into the tub
and draining the water from the tub.
9. The method of claim 1, wherein the additive comprises an
oxidizing agent.
10. The method of claim 9, wherein the oxidizing agent is greater
than or equal to 0.3 grams per liter of wash fluid within the
tub.
11. A method for washing articles in a washing machine appliance,
the washing machine appliance having a drum positioned within a
tub, the drum defining a wash chamber for receipt of articles for
washing, the method comprising: flowing a hot water volume into the
tub to a predetermined fill level, wherein the hot water volume is
at a temperature of between approximately 110 and approximately 130
degrees Fahrenheit and is the only water volume flowed at a hot
temperature into the tub; performing an agitation cycle for a
predetermined time period after flowing the hot water volume into
the tub and after a detergent and an additive have been added to
the tub, the additive comprising an oxidizing agent; flowing a cold
water volume into the tub after performing the agitation cycle,
wherein the cold water volume is at a temperature of between
approximately 50 and approximately 80 degrees Fahrenheit;
performing a subsequent agitation cycle for a predetermined time
period after flowing the cold water volume into the tub; draining
water from the tub after performing the agitation cycle and the
subsequent agitation cycle; flowing a cold water volume into the
tub to a predetermined fill level after draining the water from the
tub; draining water from the tub after flowing the cold water
volume into the tub; and performing an extraction cycle for a
predetermined time period after flowing the cold water volume into
the tub and draining the water from the tub.
12. The method of claim 11, wherein performing the agitation cycle
comprises rotating the drum in the agitation cycle and wherein
performing the extraction cycle comprises rotating the drum in the
extraction cycle.
13. The method of claim 11, wherein the predetermined time period
for performing the agitation cycle is between approximately 15 and
approximately 30 minutes.
14. The method of claim 11, wherein the predetermined time period
for performing the subsequent agitation cycle is between
approximately 5 and approximately 15 minutes.
15. The method of claim 11, further comprising: flowing a
subsequent cold water volume into the tub to a predetermined fill
level after performing the extraction cycle; draining water from
the tub after flowing the subsequent cold water volume into the
tub; and performing a subsequent extraction cycle for a
predetermined time period after flowing the subsequent cold water
volume into the tub and draining the water from the tub.
16. The method of claim 11, wherein the oxidizing agent is greater
than or equal to 0.3 grams per liter of wash fluid within the
tub.
17. A washing machine appliance, comprising: a cabinet; a tub
positioned within the cabinet; a drum rotatably mounted within the
tub, the drum defining a chamber for receipt of items for washing;
a motor in mechanical communication with the drum in order to
selectively rotate the drum; and a controller in communication with
the motor and the water inlet, the controller configured for:
flowing a hot water volume into the tub to a predetermined fill
level, wherein the hot water volume is the only water volume flowed
at a hot temperature into the tub; performing an agitation cycle
for a predetermined time period after flowing the hot water volume
into the tub and after a detergent and an additive have been added
to the tub; draining water from the tub after performing the
agitation cycle; flowing a cold water volume into the tub to a
predetermined fill level after draining the water from the tub;
draining water from the tub after flowing the cold water volume
into the tub; and performing an extraction cycle for a
predetermined time period after flowing the cold water volume into
the tub and draining the water from the tub.
18. The washing machine appliance of claim 17, wherein the
controller is further configured for: flowing a cold water volume
into the tub after performing the agitation cycle and before
draining the water; and performing a subsequent agitation cycle for
a predetermined time period after flowing the cold water volume
into the tub and before draining the water.
19. The washing machine appliance of claim 18, wherein the
predetermined time period for performing the agitation cycle is
between approximately 15 and approximately 30 minutes and wherein
the predetermined time period for performing the subsequent
agitation cycle is between approximately 5 and approximately 15
minutes.
20. The washing machine appliance of claim 17, wherein the hot
water volume is at a temperature of between approximately 110 and
approximately 130 degrees Fahrenheit and wherein the cold water
volume is at a temperature of between approximately 50 and
approximately 80 degrees Fahrenheit.
Description
FIELD OF THE INVENTION
[0001] The present subject matter relates generally to washing
machine appliances and methods for washing articles therein, and
particularly to the sanitation of articles during washing
thereof.
BACKGROUND OF THE INVENTION
[0002] Washing machine appliances generally include a cabinet which
supports a tub for containing wash fluid, e.g., water and
detergent, bleach and/or other wash additives. A basket is mounted
within the tub and defines a wash chamber for receipt of articles
for washing. During operation of such washing machine appliances,
wash fluid is directed into the tub and onto articles within the
wash chamber of the basket. The basket or an agitation element can
rotate at various speeds to agitate articles within the wash
chamber in the wash fluid, to wring wash fluid from articles within
the wash chamber, etc.
[0003] Many washing machine appliances utilize sanitization cycles
for generally sanitizing articles being washed therein.
Historically, sanitization cycles utilized thermal sanitization,
heating water in the tub to relatively high temperatures (such as
above hot water temperatures, for example such as above 130 degrees
Fahrenheit) for prolonged time periods to sanitize articles within
the tub. However, such approaches are both energy and time
intensive, resulting in overall wash cycles that can last over 2
hours and in some cases over 2.5 hours.
[0004] More recently, various additives in combination with
specifically tailored sanitization cycles have been utilized to
sanitize articles. U.S. Patent Application Publication No.
2015/0013075, filed on Jan. 15, 2015 and which is incorporated by
reference herein in its entirety, discloses the use of additives
with multiple hot water fills and multiple prolonged agitation
periods for sanitization purposes. However, the requirements of
multiple hot water fills and multiple prolonged agitation periods
still require undesirably high energy and time investments.
[0005] An additional issue with presently known sanitization cycles
is that the high temperature water utilized in such cycles can have
an undesirable effect on some stains, such as blood. Rather than
assisting in removing such stains from articles in the tub, the
high temperature water can "lock-in" the stain.
[0006] Accordingly, improved washing machine appliances and methods
for washing articles which provide improved sanitization cycles
would be advantageous. In particular, improved sanitization at
reduced time and energy levels would be desired. Further, improved
stain removal in combination with sanitization would be
desired.
BRIEF DESCRIPTION OF THE INVENTION
[0007] In accordance with one embodiment of the present disclosure,
a method for washing articles in a washing machine appliance is
provided. The washing machine appliance has a drum positioned
within a tub. The drum defines a wash chamber for receipt of
articles for washing. The method includes flowing a hot water
volume into the tub to a predetermined fill level, wherein the hot
water volume is the only water volume flowed at a hot temperature
into the tub, and performing an agitation cycle for a predetermined
time period after flowing the hot water volume into the tub and
after a detergent and an additive have been added to the tub. The
method further includes draining water from the tub after
performing the agitation cycle, and flowing a cold water volume
into the tub to a predetermined fill level after draining the water
from the tub. The method further includes draining water from the
tub after flowing the cold water volume into the tub, and
performing an extraction cycle for a predetermined time period
after flowing the cold water volume into the tub and draining the
water from the tub.
[0008] In accordance with another embodiment of the present
disclosure, a method for washing articles in a washing machine
appliance is provided. The washing machine appliance has a drum
positioned within a tub. The drum defines a wash chamber for
receipt of articles for washing. The method includes flowing a hot
water volume into the tub to a predetermined fill level, wherein
the hot water volume is at a temperature of between approximately
110 and approximately 130 degrees Fahrenheit and is the only water
volume flowed at a hot temperature into the tub, and performing an
agitation cycle for a predetermined time period after flowing the
hot water volume into the tub and after a detergent and an additive
have been added to the tub, the additive including an oxidizing
agent. The method further includes flowing a cold water volume into
the tub after performing the agitation cycle, wherein the cold
water volume is at a temperature of between approximately 50 and
approximately 80 degrees Fahrenheit, and performing a subsequent
agitation cycle for a predetermined time period after flowing the
cold water volume into the tub. The method further includes
draining water from the tub after performing the agitation cycle
and the subsequent agitation cycle, and flowing a cold water volume
into the tub to a predetermined fill level after draining the water
from the tub. The method further includes draining water from the
tub after flowing the cold water volume into the tub, and
performing an extraction cycle for a predetermined time period
after flowing the cold water volume into the tub and draining the
water from the tub.
[0009] In accordance with another embodiment of the present
disclosure, a method for washing articles in a washing machine
appliance is provided. The washing machine appliance has a drum
positioned within a tub. The drum defines a wash chamber for
receipt of articles for washing. The method includes flowing a warm
water volume into the tub to a predetermined fill level, and
performing a first agitation cycle for a predetermined time period
after flowing the warm water volume into the tub and after a
detergent has been added to the tub. The method further includes
flowing a hot water volume into the tub to a predetermined fill
level, and performing a second agitation cycle for a predetermined
time period after flowing the hot water volume into the tub and
after an additive has been added to the tub. The method further
includes draining water from the tub after performing the second
agitation cycle, and flowing a cold water volume into the tub to a
predetermined fill level after draining the water from the tub. The
method further includes draining water from the tub after flowing
the cold water volume into the tub, and performing an extraction
cycle for a predetermined time period after flowing the cold water
volume into the tub and draining the water from the tub.
[0010] In accordance with another embodiment of the present
disclosure, a method for washing articles in a washing machine
appliance is provided. The washing machine appliance has a drum
positioned within a tub. The drum defines a wash chamber for
receipt of articles for washing. The method includes flowing a warm
water volume into the tub to a predetermined fill level, wherein
the warm water volume is at a temperature of between approximately
70 and approximately 105 degrees Fahrenheit, and performing a first
agitation cycle for a predetermined time period after flowing the
warm water volume into the tub and after a detergent has been added
to the tub. The method further includes flowing a hot water volume
into the tub to a predetermined fill level, wherein the hot water
volume is at a temperature of between approximately 110 and
approximately 130 degrees Fahrenheit and is the only water volume
flowed at a hot temperature into the tub, and performing a second
agitation cycle for a predetermined time period after flowing the
hot water volume into the tub and after a detergent and an additive
have been added to the tub, the additive including an oxidizing
agent. The method further includes flowing a cold water volume into
the tub after performing the second agitation cycle, wherein the
cold water volume is at a temperature of between approximately 50
and approximately 80 degrees Fahrenheit, and performing a third
agitation cycle for a predetermined time period after flowing the
cold water volume into the tub. The method further includes
draining water from the tub after performing the third agitation
cycle, and flowing a cold water volume into the tub to a
predetermined fill level after draining the water from the tub. The
method further includes draining water from the tub after flowing
the cold water volume into the tub, and performing an extraction
cycle for a predetermined time period after flowing the cold water
volume into the tub and draining the water from the tub.
[0011] In accordance with another embodiment of the present
disclosure, a washing machine appliance is provided. The washing
machine appliance includes a cabinet, a tub positioned within the
cabinet, and a drum rotatably mounted within the tub, the drum
defining a chamber for receipt of items for washing. The washing
machine appliance further includes a motor in mechanical
communication with the drum in order to selectively rotate the
drum, and a controller in communication with the motor and the
water inlet. The controller is configured for flowing a hot water
volume into the tub to a predetermined fill level, wherein the hot
water volume is the only water volume flowed at a hot temperature
into the tub, and performing an agitation cycle for a predetermined
time period after flowing the hot water volume into the tub and
after a detergent and an additive have been added to the tub. The
controller is further configured for draining water from the tub
after performing the agitation cycle, and flowing a cold water
volume into the tub to a predetermined fill level after draining
the water from the tub. The controller is further configured for
draining water from the tub after flowing the cold water volume
into the tub, and performing an extraction cycle for a
predetermined time period after flowing the cold water volume into
the tub and draining the water from the tub.
[0012] In accordance with another embodiment of the present
disclosure, a washing machine appliance is provided. The washing
machine appliance includes a cabinet, a tub positioned within the
cabinet, and a drum rotatably mounted within the tub, the drum
defining a chamber for receipt of items for washing. The washing
machine appliance further includes a motor in mechanical
communication with the drum in order to selectively rotate the
drum, and a controller in communication with the motor and the
water inlet. The controller is configured for flowing a warm water
volume into the tub to a predetermined fill level, and performing a
first agitation cycle for a predetermined time period after flowing
the warm water volume into the tub and after a detergent has been
added to the tub. The controller is further configured for flowing
a hot water volume into the tub to a predetermined fill level, and
performing a second agitation cycle for a predetermined time period
after flowing the hot water volume into the tub and after an
additive has been added to the tub. The controller is further
configured for draining water from the tub after performing the
second agitation cycle, and flowing a cold water volume into the
tub to a predetermined fill level after draining the water from the
tub. The controller is further configured for draining water from
the tub after flowing the cold water volume into the tub, and
performing an extraction cycle for a predetermined time period
after flowing the cold water volume into the tub and draining the
water from the tub.
[0013] 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
[0014] 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.
[0015] FIG. 1 provides a perspective view of a washing machine
appliance in accordance with one embodiment of the present
disclosure;
[0016] FIG. 2 provides a schematic view of a washing machine
appliance in accordance with one embodiment of the present
disclosure; and
[0017] FIG. 3 provides a schematic view of certain components of a
washing machine appliance in accordance with one embodiment of the
present disclosure; and
[0018] FIG. 4 illustrates an exemplary method for washing articles
in a washing machine appliance in accordance with one embodiment of
the present disclosure.
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 illustrates an exemplary washing machine appliance
100. A drum 120 of washing machine appliance 100 rotates about a
substantially horizontal axis. Thus, washing machine appliance 100
is generally referred to as a horizontal axis washing machine
appliance 100. However, while described in the context of washing
machine appliance 100, using the teachings disclosed herein, it
will be understood that washing machine appliance 100 is provided
by way of example only. Other washing machine appliances having
different configurations, different appearances, and/or different
features may also be utilized with the present subject matter as
well, such as vertical axis washing machine appliances.
[0021] Washing machine appliance 100 has a cabinet 102 with a tub
122 mounted therein. Tub 122 is configured for containing wash
fluid during operation of washing machine appliance 100. Drum 120
is rotatably mounted within tub 122. Drum 120 extends between a top
portion 146 (FIG. 2) and a bottom portion 148 (FIG. 2). Top and
bottom portions 146 and 148 of drum 120 are, e.g., vertically,
spaced apart from each other. A motor 142 (FIG. 3) is in mechanical
communication with drum 120 in order to selectively rotate drum 120
(e.g., during an agitation, a spin, or a tumble cycle of washing
machine appliance 100). Drum 120 defines a wash chamber 121 that is
configured for receipt of articles for washing. Ribs 126 may extend
from drum 120 into wash chamber 121. Ribs 126 assist with agitating
articles disposed within wash chamber 121 during operation of
washing machine appliance 100. For example, ribs 126 may lift
articles disposed in drum 120 to top portion 146 of drum 120 during
rotation of drum 120 and such articles may subsequently fall to
bottom portion 148 of drum 120. Drum 120 also defines a plurality
of holes 124. Holes 124 are configured to permit a flow of wash
fluid and/or air between wash chamber 121 of drum 120 and tub 122.
A detergent drawer 106 is slidably mounted within cabinet 102.
Detergent drawer 106 receives detergent and directs the detergent
to wash chamber 121 or tub 122 during operation of appliance 100.
Detergent drawer 106 may further receive various additives as
discussed herein and direct the additives to wash chamber 121 or
tub 122 during operation of appliance 100.
[0022] Cabinet 102 of washing machine appliance defines an opening
105 that permits user access to wash chamber 121 of drum 120. A
door 130 is mounted to cabinet 102 at opening 105 with a hinge 140.
A window 136 in door 130 permits viewing of wash chamber 121 during
operation of appliance 100. Door 130 also includes a handle 132
that, e.g., a user may pull when opening and closing door 130.
Latch 134 is configured for selectively securing door 130 in a
closed position.
[0023] A control panel 110 with a plurality of input selectors 112
is also mounted to cabinet 102. Control panel 110 and input
selectors 112 collectively form a user interface for operator
selection of machine cycles and features. A display 114 of control
panel 130 indicates selected features, a countdown timer, and/or
other items of interest to appliance users.
[0024] FIG. 2 provides a schematic view of one embodiment of
washing machine appliance 100. As may be seen in FIG. 2, washing
machine appliance 100 includes a cold water inlet 150 and a hot
water inlet 152. Cold water inlet 150 is in fluid communication
with a water source, such as a municipal water main or a well.
Thus, cold water inlet 150 is configured for receipt of relatively
cold water from the water source. A cold water conduit 154 extends
between and fluidly connects cold water inlet 150 and detergent
drawer 106. Thus, relatively cold water from cold water inlet 150
can flow through cold water conduit 154 to detergent drawer 106.
Conversely, hot water inlet 152 is in fluid communication with a
hot water source, such as a hot water heater. Thus, hot water inlet
152 is configured for receipt of relatively hot water from the hot
water source. A hot water conduit 156 extends between and fluidly
connects hot water inlet 152 and detergent drawer 106. Thus,
relatively hot water from hot water inlet 152 can flow through hot
water conduit 156 to detergent drawer 106. As will be understood by
those skilled in the art and as used herein, the term "water"
includes purified water and solutions or mixtures containing water
and, e.g., elements (such as calcium, chlorine, and fluorine),
salts, bacteria, nitrates, organics, and other chemical compounds
or substances.
[0025] An inlet conduit 158 extends between and fluidly connects
detergent drawer 106 and drum 120 or tub 122. Thus, fluid within
detergent drawer 106 can flow through inlet conduit 158 into wash
chamber 121 of drum 120 or tub 122. As an example, a user can add
detergent and an additive, such as bleach, fabric softener, other
additives as discussed herein, etc., to detergent drawer 106. Water
from cold water inlet 150 and/or hot water inlet 152 can flow into
detergent drawer 106 and mix with fluid additive to form a wash
fluid. Such wash fluid can flow through inlet conduit 158 into wash
chamber 121 of drum 120 or tub 122 in order to assist with cleaning
articles disposed within wash chamber 121.
[0026] Washing machine appliance 100 also includes a sump 160,
e.g., positioned at bottom portion 148 of drum 120 or a bottom
portion (not shown) of tub 122 positioned at or proximate bottom
portion 148 of drum 120. Liquids within wash chamber 121 can
collect within sump 160 during operation of washing machine
appliance 100, e.g., due to gravity. A drain conduit 162 is
configured for directing liquids out of sump 160. In particular, a
drain pump 164 is in configured for urging liquids out of sump 160
through drain conduit 162. Liquids within drain conduit 162 are
directed out of washing machine appliance 100, e.g., to a sewer or
septic system. In particular, drain pump 164 can urge liquids
within sump 160 out of washing machine appliance 100 through drain
conduit 162. As an example, drain pump 164 can be activated during
a drain cycle of washing machine appliance 100 in order to remove
dirty or used wash fluid from sump 160.
[0027] An exhaust conduit 166, e.g., positioned at top portion 146
of drum 120 or a top portion (not shown) of tub 122 positioned at
or proximate top portion 146 of drum 120, is configured for
directed gases, e.g., air, out of wash chamber 121 of drum 120
and/or tub 122. In particular, an air handler or fan 168 is in
configured for urging gases out of wash chamber 121 of drum 120
and/or tub 122 through exhaust conduit 166. Gases within exhaust
conduit 166 are directed out of washing machine appliance 100,
e.g., to an exterior atmosphere. In particular, fan 168 can urge
gases within wash chamber 121 of drum 120 and/or tub 122 out of
washing machine appliance 100 through exhaust conduit 166. As an
example, fan 168 can be activated after a wash cycle of washing
machine appliance 100 in order to hinder mildew or mold growth
within wash chamber 121 after the wash cycle.
[0028] FIG. 3 provides a schematic view of certain components of
washing machine appliance 100. As may be seen in FIG. 3, washing
machine appliance 100 includes a processing device or controller
144. Operation of washing machine appliance 100 is controlled by
controller 144.
[0029] Controller 144 includes memory and one or more processing
devices such as 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
washing machine appliance 100. The memory can represent random
access memory such as DRAM, or read only memory such as ROM or
FLASH. The processor executes programming instructions stored in
the memory. The memory can be a separate component from the
processor or can be included onboard within the processor.
Alternatively, controller 144 may be constructed without using a
microprocessor, e.g., using a combination of discrete analog and/or
digital logic circuitry (such as switches, amplifiers, integrators,
comparators, flip-flops, AND gates, and the like) to perform
control functionality instead of relying upon software.
[0030] Controller 144 is operatively coupled to various components
of washing machine appliance 100. For example, washing machine
appliance 100 includes control panel 110 for user manipulation to
select washing machine cycles and features. Controller 144 is in
communication with control panel 110. Thus, in response to user
manipulation of control panel 110, controller 144 operates the
various components of washing machine appliance 100 to execute
selected machine cycles and features.
[0031] As an example, a user can load articles for washing into
wash chamber 121, and the user can initiate washing operation
through manipulation of input selectors 112 of control panel 110.
Controller 144 then actuates cold water inlet 150 and/or hot water
inlet 152 in order to fill drum 120 and/or tub 122 with water
and/or detergent and additives to form a wash fluid in the manner
discussed above. Once drum 120 and/or tub 122 is properly filled
with wash fluid, controller 144 activates motor 142 in order to,
for example, agitate the articles within wash chamber 121 with ribs
126 and assist with cleansing such articles.
[0032] After one or more agitation cycles of a wash cycle are
completed, controller 144 activates drain pump 164 to remove wash
fluid from drum 120 and/or tub 122. Articles can then be rinsed by
adding relatively clean fluid to drum 120 and/or tub 122 and,
depending on the particulars of the cleaning cycle selected by a
user, ribs 126 may again provide agitation within wash chamber 121.
One or more spin cycles may also be used. In particular, a spin
cycle may be applied after the wash cycle and/or after the rinse
cycle in order to wring wash fluid from the articles being washed.
During a spin cycle, drum 120 is rotated at relatively high
speeds.
[0033] As mentioned, water can be flowed into drum 120 and/or tub
122 from cold water inlet 150 and/or hot water inlet 152. A volume
of water, i.e., an amount of water that is provided into drum 120
and/or tub 122 during a single fill, can be a hot water volume and
thus be at a hot temperature when flowed into the drum 120 and/or
tub 122, or can be a warm water volume and thus be at a warm
temperature when flowed into the drum 120 and/or tub 122, or can be
a cold water volume and thus be at a cold temperature when flowed
into the drum 120 and/or tub 122. A hot temperature, and thus the
temperature of a hot water volume, may for example be between
approximately 110 and approximately 130 degrees Fahrenheit, such as
between approximately 115 and approximately 125 degrees Fahrenheit.
A warm temperature, and thus the temperature of a warm water
volume, may for example be between approximately 70 and
approximately 105 degrees Fahrenheit, such as between approximately
75 and approximately 95 degrees Fahrenheit. A cold temperature, and
thus the temperature of a cold water volume, may for example be
between approximately 50 and approximately 80 degrees Fahrenheit,
such as between approximately 55 and approximately 70 degrees
Fahrenheit. A cold water volume may be obtained through operation
of the cold water inlet 150 to flow water therethrough while not
operating the hot water inlet 152. A hot water volume may be
obtained through operation of the hot water inlet 152 to flow water
therethrough while not operating the cold water inlet 150. A warm
water volume may be obtained through operation of the cold water
inlet 150 and the hot water inlet 152 to flow water
therethrough.
[0034] FIG. 4 illustrates an exemplary method 200 for operating a
washing machine appliance according to exemplary embodiments of the
present subject matter. Such methods can advantageously provide
improved washing machine appliance when sanitization of articles is
required, by for example, advantageously requiring only a single
hot water fill and/or utilizing relatively shorter time periods for
particular agitation cycles. Further, such methods can
advantageously provide improved stain removal by utilizing initial
warm water fills when sanitization of articles is required, thus
treating rather than "locking-in" certain stains such as blood
stains. In exemplary embodiments, controller 144 can generally be
programmed to implement such methods, and thus may be configured to
perform the various steps thereof.
[0035] A method in accordance with the present disclosure may
include, for example, the step 210 of flowing a warm water volume
into the tub 122 to a predetermined fill level. The predetermined
fill level is a total liquid level within the tub 122. The
predetermined fill level may for example be dependent upon the
article volume size, and thus for example may be based on the
weight of the articles in the tub 122. For example, the
predetermined fill level may be between approximately 0.4 and
approximately 1.0 gallons per pound of articles within the tub 122.
In some embodiments, the predetermined fill level may be between
approximately 3 and approximately 7 gallons.
[0036] Method 200 may further include the step 212 of performing a
first agitation cycle for a predetermined time period. Such step
212 may occur, for example, after step 210. Further, such step 212
may occur after a detergent has been added to the tub 122, such as
via detergent drawer 106, by hand, or via another suitable delivery
apparatus or method.
[0037] The first agitation cycle generally agitates the articles
and wash fluid, including the warm water volume and detergent,
within the tub 122. In exemplary embodiments, such step 212 may
include rotating the drum 120 in the first agitation cycle.
Alternatively, such step 212 may include rotating an agitation
element relative to drum 120. Such rotation of the drum 120 or
agitation element may include various steps of rotating and/or
holding stationary to allow articles within the wash chamber 121 to
soak within the wash fluid. For example, the first agitation cycle
may include rotating for a rotation period of between approximately
5 seconds and approximately 20 seconds, such as between
approximately 10 seconds and approximately 15 seconds, and may
further include holding stationary for a soak period of between
approximately 2 seconds and approximately 10 seconds, such as
between approximately 2 seconds and approximately 6 seconds. The
rotations of drum 120 or agitation element may be performed at any
suitable speeds, such as for example between approximately 30
revolutions per minute ("RPM") and approximately 60 RPM, such as
between approximately 40 RPM and approximately 50 RPM. Such
rotation and holding may be repeated as required, and repeated
rotations may occur in opposite directions, such as clockwise, then
counterclockwise, then clockwise, etc. Further, additional or
alternative patterns of rotation (at any suitable speeds) and/or
holding may be utilized in a first agitation cycle as desired or
required.
[0038] As discussed, the first agitation cycle may be performed for
a predetermined time period. In exemplary embodiments, the
predetermined time period may be between approximately 15 minutes
and approximately 30 minutes, such as between approximately 15 and
approximately 25 minutes.
[0039] As discussed, the use of warm water in accordance with steps
210 and 212 may advantageously facilitate improved stain removal,
particularly in the case of stains such as blood which can become
"locked-in" to associated articles rather than removed when hot
water is utilized for stain removal.
[0040] Method 200 may further include the step 220 of flowing a hot
water volume into the tub 122 to a predetermined fill level. The
predetermined fill level may for example be dependent upon the
article load size, and thus for example may be based on the weight
of the articles in the tub 122. For example, the predetermined fill
level may be between approximately 0.4 and approximately 1.0
gallons per pound of articles within the tub 122. In some
embodiments, the predetermined fill level may be between
approximately 3 and approximately 7 gallons.
[0041] Further, when steps 210 and 212 are included in the method
200, step 220 may occur after step 212. Hot water volume may be
flowed into the tub 122 to raise the temperature of the existing
water from step 210 to a desired activation temperature for an
additive as discussed herein. Such activation temperature may, for
example, be between approximately 90 degrees Fahrenheit and
approximately 110 degrees Fahrenheit, such as between approximately
95 degrees Fahrenheit and approximately 105 degrees Fahrenheit. A
suitable temperature sensor (not shown) within tub 122 and in
communication with controller 144 may provide such temperature
outputs to controller 144. The temperature may be raised to the
activation temperature while not exceeding a predetermined fill
level.
[0042] Method 200 may further include the step 222 of performing a
second agitation cycle for a predetermined time period. Such step
222 may occur, for example, after step 220. Further, such step 222
may occur after an additive has been added to the tub 122, such as
via detergent drawer 106, by hand, or via another suitable delivery
apparatus or method. Additionally, in embodiments wherein steps 210
and 212 are not utilized, such step 222 may occur after a detergent
has been added to the tub 122, such as via detergent drawer 106, by
hand, or via another suitable delivery apparatus or method.
[0043] The second agitation cycle generally agitates the articles
and wash fluid, including the hot water volume, detergent and
additive, within the tub 122. In exemplary embodiments, such step
222 may include rotating the drum 120 in the second agitation
cycle. Alternatively, such step 222 may include rotating an
agitation element relative to drum 120. Such rotation of the drum
120 or agitation element may include various steps of rotating
and/or holding stationary to allow articles within the wash chamber
121 to soak within the wash fluid. For example, the second
agitation cycle may include rotating for a rotation period of
between approximately 5 seconds and approximately 20 seconds, such
as between approximately 10 seconds and approximately 15 seconds,
and may further include holding stationary for a soak period of
between approximately 2 seconds and approximately 10 seconds, such
as between approximately 2 seconds and approximately 6 seconds. The
rotations of drum 120 or agitation element may be performed at any
suitable speeds, such as for example between approximately 30
revolutions per minute ("RPM") and approximately 60 RPM, such as
between approximately 40 RPM and approximately 50 RPM. Such
rotation and holding may be repeated as required, and repeated
rotations may occur in opposite directions, such as clockwise, then
counterclockwise, then clockwise, etc. Further, additional or
alternative patterns of rotation (at any suitable speeds) and/or
holding may be utilized in a second agitation cycle as desired or
required.
[0044] As discussed, the second agitation cycle may be performed
for a predetermined time period. In exemplary embodiments, the
predetermined time period may be between approximately 15 minutes
and approximately 30 minutes, such as between approximately 15 and
approximately 25 minutes.
[0045] As discussed, an additive may be added to the tub 122, such
as before step 222. The additive may include surfactants,
emulsifiers, enzyme activated stain removers, sudsing agents,
builders, anti-redeposition polymers and perfumes, etc., and may be
an aqueous or non-aqueous solution or mixture. The additive in
exemplary embodiments includes an oxidizing agent. Oxidizing agents
are active oxygen releasing compound, e.g., peroxides (peroxygen
compounds) such as perborate, percarbonates, perphosphates,
persilicates, persulfates, their sodium, ammonium, potassium and
lithium analogs, calcium peroxide, zinc peroxide, sodium peroxide,
carbamide peroxide, hydrogen peroxide, and the like. These agents
also include peroxy acids and organic peroxides and various
mixtures thereof.
[0046] A peroxy acid is an acid in which an acidic --OH group has
been replaced by an --OOH group. They are formed chiefly by
elements in groups 14, 15 and 16 of the periodic table, but boron
and certain transition elements are also known to form peroxy
acids. Sulfur and phosphorus form the largest range of peroxy
acids, including some condensed forms such as peroxydiphosphoric
acid, H.sub.4P.sub.2O.sub.8 and peroxydisulfuric acid,
H.sub.2S.sub.2O.sub.8. This term also includes compounds such as
peroxy-carboxylic acids and meta-chloroperoxybenzoic acid
(mCPBA).
[0047] Organic peroxides are organic compounds containing the
peroxide functional group (ROOR'). If the R' is hydrogen, the
compound is called an organic hydroperoxide. Peresters have general
structure RC(O)OOR. The O--O bond easily breaks and forms free
radicals of the form RO.. This makes organic peroxides useful for
cleaning purposes.
[0048] Oxidizing agents may be combined within a mixture that has a
selection of other material, such as one or more of the following:
builders, surfactants, enzymes, bleach activators, bleach
catalysts, bleach boosters, alkalinity sources, antibacterial
agents, colorants, perfumes, pro-perfumes, finishing aids, lime
soap dispersants, composition malodor control agents, odor
neutralizers, polymeric dye transfer inhibiting agents, crystal
growth inhibitors, photobleaches, heavy metal ion sequestrants,
anti-tarnishing agents, anti-microbial agents, anti-oxidants,
linkers, anti-redeposition agents, electrolytes, pH modifiers,
thickeners, abrasives, divalent or trivalent ions, metal ion salts,
enzyme stabilizers, corrosion inhibitors, diamines or polyamines
and/or their alkoxylates, suds stabilizing polymers, solvents,
process aids, fabric softening agents, optical brighteners,
hydrotropes, suds or foam suppressors, suds or foam boosters,
fabric softeners, antistatic agents, dye fixatives, dye abrasion
inhibitors, anti-crocking agents, wrinkle reduction agents, wrinkle
resistance agents, soil release polymers, soil repellency agents,
sunscreen agents, anti-fade agents, water soluble polymers, water
swellable polymers and mixtures thereof.
[0049] In exemplary embodiments, the oxidizing agent is or includes
sodium percarbonate, such as between approximately 30 and
approximately 50 percent sodium percarbonate. In exemplary
embodiments when the additive is added to the tub 122, the
oxidizing agent may be greater than or equal to 0.3 grams per liter
of wash fluid within the tub 122. Further, in exemplary
embodiments, the additive may further include, for example, a
bleach activator component such as sodium
nonanoyloxybenzenesulfonate (NOBS), tetraacetylethylenediamine
(TAED), or decanoyloxybenzoic acid (DOBA). In exemplary
embodiments, the additive may include between approximately 1% and
approximately 7% bleach activator. Suitable commercially available
additives include, for example, OxiClean.RTM. products and Clorox
2.RTM. products.
[0050] Notably, in exemplary embodiments, the hot water volume
utilized in step 220 may be the only water volume that is flowed at
a hot temperature into the tub 122, and thus the only hot water
volume utilized during an overall wash cycle that utilizes method
200. Accordingly, in exemplary embodiments, any water volume other
than the hot water volume utilized in step 220 is either a cold
water volume or a warm water volume. The present inventors have
discovered that the use of a single hot water volume in accordance
with the present disclosure and in combination with detergent and
an additive as discussed herein can advantageously reduce common
bacterial levels by, for example, 99.9%. Accordingly, use of a
single hot water volume is advantageously sufficient to provide
desired sanitization of articles in the volume. Such approach to
sanitization advantageously reduces the energy and time levels
associated with such sanitization while advantageously retaining
the desired sanitization properties.
[0051] Method 200 may further include, for example, the step 224 of
draining water (as well as detergent and additive) from the tub
122. Drain conduit 162 and drain pump 164 may, for example, be
utilized to drain such water, etc. as discussed above. Such step
224 may, for example, occur after step 222. In some embodiments,
step 224 may occur directly after step 222. In other embodiments,
additional steps as discussed herein may occur before step 224.
[0052] For example, method 200 may further include, for example,
the step 230 of flowing a cold water volume into the tub 122. Such
step 230 may occur, for example, after step 222. Additionally, such
step 230 may occur before step 224. In exemplary embodiments, cold
water volume may have a predetermined size, such as for example,
between approximately 0.2 and approximately 0.8 gallons. The size
of the cold water volume may be small relative to the predetermined
fill level of steps 210 and/or 220, and may for example, be
utilized simply as a flush of the detergent drawer 106 and/or other
suitable dispensing apparatus for bleach, other additives, etc.
[0053] Method 200 may further include the step 232 of performing a
third agitation cycle for a predetermined time period. Such step
232 may occur, for example, after step 230 (and before step 224).
The third agitation cycle generally agitates the articles and wash
fluid, including the water volume from steps 210 and/or 220,
detergent and additive, and the cold water volume from step 230,
within the tub 122. In exemplary embodiments, such step 232 may
include rotating the drum 120 in the third agitation cycle.
Alternatively, such step 232 may include rotating an agitation
element relative to drum 120. Such rotation of the drum 120 or
agitation element may include various steps of rotating and/or
holding stationary to allow articles within the wash chamber 121 to
soak within the wash fluid. For example, the third agitation cycle
may include rotating for a rotation period of between approximately
5 seconds and approximately 20 seconds, such as between
approximately 10 seconds and approximately 15 seconds, and may
further include holding stationary for a soak period of between
approximately 2 seconds and approximately 10 seconds, such as
between approximately 2 seconds and approximately 6 seconds. The
rotations of drum 120 or agitation element may be performed at any
suitable speeds, such as for example between approximately 30
revolutions per minute ("RPM") and approximately 60 RPM, such as
between approximately 40 RPM and approximately 50 RPM. Such
rotation and holding may be repeated as required, and repeated
rotations may occur in opposite directions, such as clockwise, then
counterclockwise, then clockwise, etc. Further, additional or
alternative patterns of rotation (at any suitable speeds) and/or
holding may be utilized in a third agitation cycle as desired or
required.
[0054] As discussed, the third agitation cycle may be performed for
a predetermined time period. In exemplary embodiments, the
predetermined time period may be between approximately 5 minutes
and approximately 20 minutes, such as between approximately 5 and
approximately 15 minutes.
[0055] As discussed, draining step 224 may occur after step 222, as
well as for example after step 232. Method 200 may further include,
for example, the step 226 of performing a first extraction cycle
for a predetermined time period. Such step 226 may occur, for
example, after step 224. In exemplary embodiments, such step 226
may include rotating the drum 120 in the first extraction cycle.
The first extraction cycle may extract water (as well as detergent
and additive) from the articles within the wash chamber 121.
Rotation of the drum 120 in the first extraction cycle may occur
for example at a generally higher speed than any of the agitation
cycle discussed herein, such as for example between approximately
300 RPM and approximately 1200 RPM. The predetermined time period
for the first extraction cycle may, for example, be between
approximately 5 minutes and approximately 15 minutes.
[0056] Method 200 may further include, for example, the step 240 of
flowing a cold water volume into the tub 122 to a predetermined
fill level. Such step 240 may occur, for example, after steps 224
and 226. The predetermined fill level is a total liquid level
within the tub 122. The predetermined fill level may for example be
dependent upon the article load size, and thus for example may be
based on the weight of the articles in the tub 122. For example,
the predetermined fill level may be between approximately 0.4 and
approximately 1.0 gallons per pound of articles within the tub 122.
In some embodiments, the predetermined fill level may be between
approximately 3 and approximately 7 gallons.
[0057] In some embodiments, methods 200 may further include, for
example, the step of performing a fourth agitation cycle for a
predetermined time period. Such step may, for example, occur after
step 240. The fourth agitation cycle may for example be performed
in accordance with the variables of the first, second or third
agitation cycles as discussed above. In exemplary embodiments, the
predetermined time period may for example be between approximately
1 minute and approximately 5 minutes.
[0058] Method 200 may further include, for example, the step 242 of
draining water (as well as detergent and additive) from the tub
122. Drain conduit 162 and drain pump 164 may, for example, be
utilized to drain such water, etc. as discussed above. Such step
242 may, for example, occur after step 240 as well as after the
optional agitation step subsequent to step 240.
[0059] Method 200 may further include, for example, the step 244 of
performing a subsequent second extraction cycle for a predetermined
time period. Such step 244 may occur, for example, after step 240,
the optional agitation step subsequent to step 240, and step 242.
In exemplary embodiments, such step 244 may include rotating the
drum 120 in the second extraction cycle. The second extraction
cycle may extract water (as well as detergent and additive) from
the articles within the wash chamber 121. Rotation of the drum 120
in the second extraction cycle may occur for example at a generally
higher speed than any of the agitation cycle discussed herein, such
as for example between approximately 300 RPM and approximately 1200
RPM. The predetermined time period for the second extraction cycle
may, for example, be between approximately 5 minutes and
approximately 15 minutes.
[0060] In some embodiments, upon ceasing of step 244, the overall
wash cycle may end. Alternatively, a second series of steps may be
utilized to further rinse the articles and thus remove remaining
detergent and/or additive and to repeat the subsequent extraction.
Accordingly, methods 200 may further include, for example, the step
250 of flowing a cold water volume into the tub 122 to a
predetermined fill level. Such step 250 may occur, for example,
after step 244. The predetermined fill level is a total liquid
level within the tub 122. The predetermined fill level may for
example be dependent upon the article load size, and thus for
example may be based on the weight of the articles in the tub 122.
For example, the predetermined fill level may be between
approximately 0.4 and approximately 1.0 gallons per pound of
articles within the tub 122. In some embodiments, the predetermined
fill level may be between approximately 3 and approximately 7
gallons.
[0061] In some embodiments, methods 200 may further include, for
example, the step of performing a fifth agitation cycle for a
predetermined time period. Such step may, for example, occur after
step 250. The fifth agitation cycle may for example be performed in
accordance with the variables of the first, second, third or fourth
agitation cycles as discussed above. In exemplary embodiments, the
predetermined time period may for example be between approximately
1 minute and approximately 5 minutes.
[0062] Method 200 may further include, for example, the step 252 of
draining water (as well as detergent and additive) from the tub
122. Drain conduit 162 and drain pump 164 may, for example, be
utilized to drain such water, etc. as discussed above. Such step
252 may, for example, occur after step 250 as well as after the
optional agitation step subsequent to step 250.
[0063] Method 200 may further include, for example, the step 254 of
performing a subsequent third extraction cycle for a predetermined
time period. Such step 254 may occur, for example, after step 250,
the optional agitation step subsequent to step 250, and step 252.
In exemplary embodiments, such step 254 may include rotating the
drum 120 in the third extraction cycle. The third extraction cycle
may extract water (as well as detergent and additive) from the
articles within the wash chamber 121. Rotation of the drum 120 in
the third extraction cycle may occur for example at a generally
higher speed than any of the agitation cycle discussed herein, such
as for example between approximately 300 RPM and approximately 1200
RPM. The predetermined time period for the third extraction cycle
may, for example, be between approximately 5 minutes and
approximately 15 minutes.
[0064] In some embodiments, upon ceasing of step 254, the overall
wash cycle may end. Alternatively, a third or more series of steps
may be utilized to further rinse the articles and thus remove
remaining detergent and/or additive and to repeat the subsequent
extraction. In exemplary embodiments, upon ceasing of such steps,
the overall wash cycle may end.
[0065] 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.
* * * * *