U.S. patent application number 15/618186 was filed with the patent office on 2017-12-14 for method for controlling water supply of dishwasher.
The applicant listed for this patent is LG ELECTRONICS INC.. Invention is credited to Taehwan CHO, Kitae KWON, Wonho SHIN.
Application Number | 20170354306 15/618186 |
Document ID | / |
Family ID | 59014522 |
Filed Date | 2017-12-14 |
United States Patent
Application |
20170354306 |
Kind Code |
A1 |
CHO; Taehwan ; et
al. |
December 14, 2017 |
METHOD FOR CONTROLLING WATER SUPPLY OF DISHWASHER
Abstract
A dishwasher and a method for controlling a dishwasher are
provided. The dishwasher may include a washing tub that defines a
washing space in which one or more dishes may be placed; an
injection unit that injects wash water to the dishes; a sump
provided underneath of the washing tub; a drive that supplies and
circulates the wash water stored in the sump to the injection unit;
and a drainage pump that drains the wash water from the sump. The
method for controlling the dishwasher may include supplying wash
water to the dishwasher; washing dishes using the wash water;
rinsing the washed dishes; and drying the dishes. The method may
further include exhausting by operating the drainage pump for a
predetermined period of time to exhaust air from the drainage pump
after the supplying of the wash water to the dishwasher.
Inventors: |
CHO; Taehwan; (Seoul,
KR) ; KWON; Kitae; (Seoul, KR) ; SHIN;
Wonho; (Seoul, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LG ELECTRONICS INC. |
Seoul |
|
KR |
|
|
Family ID: |
59014522 |
Appl. No.: |
15/618186 |
Filed: |
June 9, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A47L 15/0031 20130101;
A47L 15/0049 20130101; A47L 2501/05 20130101; A47L 2401/09
20130101; A47L 15/4225 20130101; A47L 15/4285 20130101; A47L
15/4234 20130101; A47L 2501/10 20130101; A47L 15/4244 20130101 |
International
Class: |
A47L 15/00 20060101
A47L015/00; A47L 15/42 20060101 A47L015/42 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 10, 2016 |
KR |
10-2016-0072196 |
Claims
1. A method for controlling a dishwasher, the method comprising:
supplying wash water to the dishwasher; exhausting air remaining in
a path of the wash water in the supplying of the wash water to the
dishwasher; washing dishes by injecting wash water to the dishes;
rinsing the dishes; and drying the dishes.
2. The method for controlling the dishwasher of claim 1, wherein
the exhausting of the air remaining in the path of the wash water
is performed for a predetermined period of time when the supplying
of the wash water to the dishwasher starts to be performed.
3. The method for controlling the dishwasher of claim 1, wherein
the air exhausting of the air remaining in the path of the wash
water is performed after a predetermined amount of wash water is
supplied in the supplying of the wash water to the dishwasher.
4. The method for controlling the dishwasher of claim 1, wherein
the air exhausting of the air remaining in the path of the wash
water includes operating a drainage pump for draining the wash
water.
5. The method for controlling the dishwasher of claim 4, wherein
the drainage pump includes: a drainage chamber in which wash water
is stored; an impeller that drains the wash water from the,
drainage chamber; and a drainage path connected to the drainage
chamber, and wherein the exhausting of the air remaining in the
path of the wash water includes rotating the impeller in a
predetermined direction in which the air is rotated to move toward
the drainage path.
6. The method for controlling the dishwasher of claim 5, wherein
the exhausting of the air remaining in the path, of the wash water
includes repeatedly and intermittently operating the drainage pump
for a predetermined period of time.
7. The method for controlling the dishwasher of claim 6, wherein
the exhausting of the air remaining in the path of the wash water
includes repeating the intermittent operation process in which the
drainage pump is operated for 1.about.2 seconds and paused for
1.5.about.2.5 seconds.
8. A method for controlling a dishwasher including a washing tub
that defines a washing space in which one or more dishes are
placed; an injection unit that injects wash water to the dishes; a
sump provided underneath the washing tub; a drive that supplies and
circulates the wash water stored in the sump to the injection unit;
and a drainage pump that drains the wash water from the sump, the
method for controlling the dishwasher comprising: supplying wash
water into the dishwasher; washing dishes using the wash water;
rinsing the washed dishes; drying the dishes; and exhausting air by
operating the drainage pump for a predetermined period of time to
exhaust air from the drainage pump after the supplying of the wash
water to the dishwasher.
9. The method for controlling the dishwasher of >claim 8,
wherein the drainage pump includes; a drainage chamber in which
wash, water is stored; an impeller that drains the wash water from
the drainage chamber; and a drainage path connected to the drainage
chamber, and wherein the exhausting of air includes rotating the
impeller in a predetermined direction in which the air is rotated
to move toward the drainage path.
10. The method for controlling the dishwasher of claim 9, wherein
the exhausting of air by operating the drainage pump for the
predetermined period of time to exhaust air from the drainage pump
after the supplying of the wash water to the dishwasher includes
repeatedly and intermittently operating the drainage pump for the
predetermined period of time.
11. The method for controlling the dishwasher of claim 10, wherein
exhausting of air by operating the drainage pump for the
predetermined period of time to exhaust air from the drainage pump
after the supplying of the wash water to the dishwasher includes
repeating the intermittent operation process in which the drainage
pump is operated for 1.about.2 seconds and paused for 1.5.about.2.5
seconds.
12. The method for controlling the dishwasher of claim 8, wherein
the exhausting of air by operating the drainage pump for the
predetermined period of time to exhaust air from the drainage pump
after the supplying of the wash water to the dishwasher is
performed in the predetermined period of time when the supplying of
wash water to the dishwasher starts to be performed.
13. The method for controlling the dishwasher of claim 8, wherein
the exhausting of air by operating the drainage pump for the
predetermined period of time to exhaust air from the drainage pump
after the supplying of the wash water to he dishwasher is performed
after a predetermined amount of wash water is supplied in the
supplying wash water to the dishwasher.
14. The method for controlling the dishwasher of claim 13, wherein
the predetermined amount is a first reference level or a second
reference level.
15. The method for controlling the dishwasher of claim 14, wherein
the drainage pump includes: a drainage chamber in which wash water
is stored; an impeller that drains the wash water from the drainage
chamber; and a drainage path connected to the drainage chamber, and
wherein the exhausting of air includes rotating the impeller in a
predetermined direction in which the air is rotated to move toward
the drainage path.
16. The method for controlling the dishwasher of claim 15, wherein
the first reference level is a water level to a height of an upper
end of an outlet hole of the sump located in a center of the
drainage chamber and the second reference level is a water level to
a height of an upper end of an outlet pipe of the drainage
chamber
17. A method for controlling a dishwasher including a washing tub
that defines a washing space in which one or more dishes are
placed; an injection unit that injects wash water to the dishes; a
sump provided underneath the washing tub; a drive that supplies and
circulates the wash water stored in the sump to the injection unit;
and a drainage pump that drains the wash water from the sump, the
method for controlling the dishwasher comprising: supplying wash
water into the dishwasher; washing dishes using the wash water;
rinsing the washed dishes; drying the dishes; and exhausting air by
operating the drainage pump for a predetermined period of time to
exhaust air from the drainage pump after the supplying of the wash
water to the dishwasher, wherein the exhausting of air by operating
the drainage pump for the predetermined period of time to exhaust
air from the drainage pump after the supplying of the wash water to
the dishwasher is performed after a predetermined amount of wash
water is supplied in the supplying wash water to the dishwasher,
the predetermined amount of wash water being sensed by a water
level sensor.
18. The method for controlling the dishwasher of claim 17, wherein
the predetermined amount is a first reference level or a second
reference level.
19. The method for controlling the dishwasher of claim 18, wherein
the drainage pump includes: a drainage chamber in which wash water
is stored; an impeller that drains the wash water from the drainage
chamber; and a drainage path connected to the drainage chamber, and
wherein the exhausting of air includes rotating the impeller in a
predetermined direction in which the air is rotated to move toward
the drainage path.
20. The method for controlling the dishwasher of claim 19, wherein
the first reference level is a water level to a height of an upper
end of an outlet hole of the sump located in a center of the
drainage chamber and the second reference level is a water level to
a height of an upper end of an outlet pipe of the drainage chamber.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)
[0001] This application claims priority to Korean Patent
Application No. 10-2016-0072196, filed in Korea on Jun. 10, 2016,
the entire contents of which is hereby incorporated by reference in
its entirety.
BACKGROUND
1. Field
[0002] A dishwasher and a method for controlling a dishwasher by
controlling a drainage pump in a water supply so as to prevent
cavitation of the drainage pump provided in the dishwasher are
disclosed herein.
2. Background
[0003] Generally, a dishwasher is an electric appliance configured
to wash dishes held therein by injecting wash water at a high
pressure to the dishes and dry them. More specifically, wash water
is injected into a washing tub, in which the dishes are held, at a
high pressure in the dishwasher and the injected wash water is
configured to contact with the dishes so as to remove food scraps
from surfaces of the dishes.
[0004] Such a dishwasher is capable of filtering the food scraps or
contaminants contained in the wash water using a filter and
re-using the filtered water. Also, detergent is dissolved in the
wash water and supplied mixedly together with the wash water.
[0005] Recently, dishwashers a motor of which raises a temperature
of the wash water or generates steam to enhance efficiency of a
washing performance have been broadly developed. Such a
conventional dishwasher includes a case that defines an external
appearance; a washing tub provided in the cabinet and defining a
washing space for the dishes; a door coupled to a front of the
washing tub to open and close the washing tub; a sump provided
under the washing tub and configured to supply, collect, circulate
and drain wash water for washing>the dishes; lower and upper
arms that inject the wash water supplied by the sump to the dishes;
and lower and upper racks slidingly provided in the tub and
selectively disposed according to kinds and sizes of the
dishes.
[0006] To wash dishes, using the dishwasher, a user has to open the
door and draw out the rack from the washing tub. Then, the user
puts dishes to be washed on the drawn out rack and pushes the rack
back into the washing tub. Finally, the user closes the door. Once
the user thereafter puts the dishwasher into operation, the dishes
disposed on the lower and upper rack start to be washed while wash
water is independently or simultaneously supplied to the
upper/lower arm.
[0007] For the washing of the dishes, wash water has to be supplied
and drained. The supplied wash water is guided into the sump and
supplied to the lower and upper arms by an auxiliary pump. The wash
water having been used in the washing is drained outside of the
dishwasher by a drainage pump.
[0008] The drainage pump is typically located below the sump and
the wash water is suctioned into a drainage space defined in the
drainage pump, as wash water is supplied. Air remaining in the
drainage space has to be exhausted via a drainage pipe as the wash
water is drawn into the drainage space. Because of differences
between the drainage pipe and the drainage space in height and
pressure, the air might fail to be exhausted.
[0009] An auxiliary air outlet hole may be provided in the drainage
space to exhaust the air remaining in the drainage space. Such an
air outlet hole might be blocked by contaminants drained together
with the wash water during the wash water drainage. In a case in
which the air outlet hole is blocked, the drainage of the drainage
pump might be performed smoothly and the drained wash water might
counter-flow disadvantageously.
[0010] Accordingly, there is a disadvantage that smooth and
efficient operation of the drainage pump might fail, because an
exhaustion pressure not formed by the drainage pump in a case in
which air remaining in the drainage space of the drainage pump is
not exhausted.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Embodiments will be described in detail with reference to
the following drawings in which like reference numerals refer to
like elements, and wherein;
[0012] FIG. 1 is a schematic diagram illustrating a dishwasher in
accordance with an embodiment;
[0013] FIG. 2 is an exploded perspective view illustrating a
drainage unit of the dishwasher in accordance with an
embodiment;
[0014] FIG. 3 is a cross-sectional view illustrating an internal
structure of the drainage unit In accordance with an
embodiment;
[0015] FIG. 4 is a side sectional view illustrating the internal
structure of the drainage unit n accordance with an embodiment;
[0016] FIG. 5 is a flow chart illustrating operation of the
dishwasher in accordance with an embodiment;
[0017] FIG. 6 is a flow chart illustrating operation of the
drainage pump to remove an air pocket in accordance with an
embodiment; and
[0018] FIG. 7 is a flow chart illustrating operation of the
drainage pump to remove an air pocket in accordance with another
embodiment.
DETAILED DESCRIPTION
[0019] Referring to, the accompanying drawings, embodiments will be
described Use of such terminology for structures and control
methods herein is merely intended to facilitate description of the
specification, and the terminology itself is not intended to give
any special meaning or function. That which is well-known to one of
ordinary skill in the relevant art has generally been omitted for
the sake of brevity. Regardless of numeral references, the same or
equivalent components may be provided with the same reference
numbers and description thereof will not be repeated.
[0020] Hereinafter, referring to the accompanying drawings, a
dishwasher in accordance with an embodiment will be described.
[0021] FIG. 1 is a schematic diagram illustrating a dishwasher in
accordance with an embodiment. As shown in FIG. 1, the dishwasher
100 may include a cabinet 110 that defines an external appearance;
a washing tub 120 provided in the cabinet 110 and defining a
washing, space in which one or more washing objects or dishes may
be washed; a plurality of racks 130a and 130b detachably mounted in
the washing tub 120 and having the washing objects or dishes
disposed thereon; a plurality of injection arms 122 and 124 that
injects wash water to the washing objects disposed on the racks
130a and 130b; and a sump 140 that calculates and supplies wash
water to the injection arms 122 and 124 and collects and receives
the wash water supplied to the washing space.
[0022] An opening may be formed in the washing tub 120, with a
closable front side, to allow the washing tub 120 to communicate
with the outside of the cabinet 110. The opening may be opened and
closed by a door 113 rotatably coupled to the cabinet 110.
Accordingly, a user may draw the racks 130a and 130b from the
washing tub 120 after opening the opening by rotating the door
113.
[0023] The plurality of racks 130a and 130b on which the washing
objects may be disposed may be provided in the washing tub 120. The
plurality of racks 130a and 130b may include an upper rack 130a
provided in an upper portion of the washing tub, and a lower rack
provided under the upper rack 130a. In a case in which the
plurality of racks 130a and 130b is configured of the upper rack
130a and the lower rack 130b, the injection arms 122 and 124 may
include an upper arm 122 that injects water to the upper rack 130a,
and a lower arm 124 that injects water to the lower rack 130b. The
wash water (the water remaining in the washing tub 120) injected to
the washing objects from the injection arms 112 and 124 may be
collected in the sump 140.
[0024] The sump 140 may be provided underneath the washing tub 120
and function as a means for storing water. The sump 140 may be
partitioned off from the washing tub 120 by a sump cover 142. One
or more hole 144 may be provided in the sump cover 12 to suction
the water into the sump 140 from the washing tub 120 into a sump
collection chamber 143.
[0025] The sump 140 may be connected to a water supply source (not
shown) via a water supply unit 150. The water supply unit 150 may
be opened and closed by a water supply valve 152. In addition, the
water supply unit 150 may include a water flow sensor (not shown)
that senses an amount of the wash water supplied through the water
supply valve 152.
[0026] A drainage unit 160 may be provided in a lower portion of
the sump 140 to exhaust the wash water and food scraps drawn into
the sump 140. An outlet hole 146 through.sub.>which the wash
water and food scraps suctioned into the sump 140 may be exhausted
may be provided in a lower portion of the sump 140 and communicate
with the drainage pipe.
[0027] The drainage unit 160 may include a drainage chamber 61 in
which the drainage pump 165 may be installed, and, a drainage pipe
183 that guides the wash water and food scraps exhausted from the
drainage chamber 161 by the drainage pump 165. Referring to the
accompanying drawings, the drainage unit 160 will be described
hereinafter.
[0028] The water stored in the sump 140 may be supplied to the
injection arms 122 and 124 via a water supply path 170 by a pump
180. The water supply path 170 may include a connection path 172
connected to the pump 180; an upper path 174 that connects the
connection path 172 and the upper arm 122 with each other; and a
lower path 176 that connects the connection path 172 and the lower
arm 174 with each other.
[0029] The upper arm 122 may be rotatably connected to the upper
path 174 and the lower arm 124 may be rotatably connected to the
lower path 176. The upper path 174 and the lower path 176 may be
formed by a branching of the connection path 172. transfer valve
178 that controls opening/closing of the paths 174 and 176 may be
provided in or at a branched point between the upper path 174 and
the lower path 176.
[0030] The pump 180 may include a pump body 82 fixed in the cabinet
110; a partition wall 183 that defines a pumping chamber 184 and a
heating chamber 186 by portioning off an internal space of the pump
body 182; a partition through hole 183a provided in the partition
wall 183 to allow the pumping chamber 184 and the heating chamber
186 to communicate with each other; and an impeller 181a provided
in the pumping chamber 184.
[0031] The heating chamber 186 may be connected with the sump 140
by a pump inlet 187 that penetrates the pump body 182, and the
pumping chamber 184 may be connected with the connection path 172
by a pump outlet 185 that penetrates the pump body 182. The
impeller 181a may be rotated by a motor 181 fixed to an upper
surface of the pump body 182. A shaft of the motor 181 may be
connected to the impeller 181a located in the pumping chamber 184
through an upper surface of the pump body 182.
[0032] A heating unit 188 may be provided in a bottom surface of
the heating chamber 186. When the pump body 182 is
cylindrical-shaped with an open bottom surface, the heating unit
188 may define the bottom surface of the heating chamber 186.
[0033] The heating unit 188 may include a heating plate 188a
defining the bottom surface of the heating chamber 186, and a
heater 189 fixed to a bottom surface of the heating plate 188a and
located outside of the heating chamber 186. The heating plate 188a
may be formed, for example of a metal which is easily to transmits
heat. In addition, the heating unit 188 may be configured to define
the bottom surface of the heating chamber 186, to provide the pump
180 which is capable of performing the function of water supply to
the, injection arms 122 and 124 and the function of water heating
simultaneously.
[0034] The dishwasher 100 including the pump 180 discussed above
may supply steam to the washing tub 120 using the heating unit 188
provided in the pump 180. For that, a steam supply unit 190 may be
further provided in the dishwasher 100.
[0035] The steam supply unit 190 may include a nozzle 192 that
injects steam into the washing tub 120; a steam supply pipe 194
that connects the nozzle 192 to the heating chamber 186; and a
steam valve 196 that opens d closes the steam supply pipe. FIG. 1
illustrates the nozzle 192 provided'in the door 113 as one example.
In this instance, the nozzle 192 may be installed or provided'in or
at a lower portion of an inner surface of the door 113.
[0036] Hereinafter, a drainage unit will be described, referring to
the accompanying drawings.
[0037] FIG. 2 is an exploded perspective diagram illustrating a
drainage unit of the dishwasher in accordance with an embodiment.
FIG. 3 is a cross-sectional view illustrating an internal structure
of the drainage unit in accordance with an embodiment. FIG. 4 is a
side sectional view illustrating the internal structure of the
drainage unit in accordance with an embodiment.
[0038] As shown in FIGS. 2 through 4, drainage unit 160 in
accordance with an embodiment may include drainage chamber 161
provided in a lower portion of the sump 140 and defining a
predetermined pumping space for pumping the drained wash water, in
communication with the outlet hole 146 of the, sump 140; drainage
pump 165 connected to the drainage chamber 171 and including a
drainage impeller 166 that drains the wash water; an outlet pipe
162 that exhausts wash water and food scraps along with rotation of
the impeller 166, in communication with one side of the drainage
chamber 161; and drainage pipe 163 connected to the outlet pipe 162
and guiding the exhausted wash water.
[0039] The drainage pump 165 may include a motor 168 that defines
one surface of the drainage chamber 161 and coupled to the drainage
chamber 161; a sealing member 167 provided between the motor 168
and, the drainage chamber 161 and preventing leakage of wash water;
and impeller 166 coupled to a shaft of the motor 168 and configured
to forcibly exhausting the wash water from the drainage chamber 161
to the outlet pipe 162 by a centrifugal force.
[0040] The outlet hole 146 of the sump 140 in communication with
the drainage chamber 161 is related to a location of the impeller
166 provided in the drainage pump 165. The outlet hole 146 may be
provided at a center of rotation performed by the impeller 166 to
exhaust the wash water along with the rotation of the impeller 166.
The outlet pipe 162 provided in the drainage chamber 161 may be
connected to or at a predetermined portion of the drainage chamber
161 to exhaust the wash water along the rotation of the impeller
166 and the wash water and food scraps drawn into the drainage
chamber 161 simultaneously.
[0041] The drainage pipe 163 may be connected to the outlet pipe
162 to guide the wash water containing food scraps drained by the
drainage pump 165 outside of the dishwasher 100. A check valve 164
may be further provided in a predetermined region of the drainage
pipe 163 to prevent the exhausted rash water and food scraps from
counter-flowing.
[0042] Next operation of the dishwasher 100 will be described
referring to the accompanying drawings. Each of the components
which will be discussed hereinafter, with reference to the
description and drawings discussed above.
[0043] FIG. 5 is a flow chart illustrating operation of the
dishwasher in accordance with an embodiment. As shown in FIG. 5, a
user may place dishes on upper rack or lower rack 130a or 130b of
dishwasher 100 and then select a wash start button (not shown) to,
start the washing for the dishes.
[0044] Once operation of the dishwasher 100 starts, a water supply
step or operation (S110) for supplying water to washing tub 120 may
be performed. After the water supply step (S110) is complete, a
preliminary washing step or operation (S120) for soaking
contaminants or food scraps which are stuck on the dishes may be
performed.
[0045] After the preliminary washing step (S120) a main washing
step or operation (S130) for spraying the wash water mixed with
detergent may be performed to remove the contaminants and food
scraps. Once the main washing step (S130) is complete, a rinsing
step or operation (S140) may be performed and then a drying step or
operation (S150) for drying the dishes may be performed after the
rinsing step (S140).
[0046] Before the main washing step (S130) starts after the
preliminary washing step (S120), water drainage for collecting the
wash water injected in the preliminary washing step (S120) may be
performed. Wash water ay be pumped by the pump 180 and injected
into the washing tub 120 via upper arm 122 and lower arm 124. The
wash water injecting process may be repeated for a preset or
predetermined time period.
[0047] The wash water injection may be performed a preset or
predetermined number of times and the main washing step (S130) may
be performed the preset number of times. The main washing step
(S130) may be completed and the rinsing step (S140) may then be
performed. The wash water supplied in the main washing step (S130)
may be drained before the rinsing step (S130) starts.
[0048] After the rinsing step (S140), a drying step or operation
(S150) may be performed to remove moisture contained on the dishes.
In the drying step (S150) hot air may be supplied to the washing,
tub 120 and the moisture evaporated from the dishes. Air changed
into high-temperature humid air may be exhausted outside of the
dishwasher 100 by an auxiliary dry module (not shown).
[0049] The water supply step (S110), the preliminary washing step
(S120), the main washing step (S130), the rinsing step (S140) and
the drying step (S150) discussed above may be similar to
corresponding steps provided in a conventional dishwasher. Detailed
description regarding these steps has been omitted accordingly.
[0050] The wash water supplied in those steps may be drawn into the
drainage chamber 161 via the outlet hole 146 from the sump 140. As
it is being drawn into the drainage chamber 161, the wash water
fills a drainage space 161a defined in the drainage chamber 161 so
that the air not exhausted via the drainage pipe 163 may form an
air pocket 161b in an upper portion of the drainage chamber 161a.
In other words, the wash water drawn into the drainage chamber 161
is filled to a height (H1) which reaches an upper end of the outlet
hole 146 located in the center of the drainage chamber 161
Alternatively, the wash water may be filled in the drainage chamber
167 to a height (H2) which reaches an upper end of the outlet pipe
162 according to an arrangement of the drainage pipe 163.
[0051] At this time, a maximum water level the wash water drawn
into the drainage chamber 161 in the drainage space 161a may be
between the height (H1), that is, the upper end of the outlet hole
146, and the height (H2), that is, the upper end of the outlet pipe
162. The air pocket 161b may be formed above the wash water level
stored in the drainage chamber 161 by the air not exhausted outside
of the drainage chamber 161. Accordingly, the air pocket 161b
formed in the drainage chamber 161 may interfere with water
currents formed by the impeller 166 of the drainage pump 165 and
then interfere with smooth drainage from the drainage chamber
161.
[0052] Thus, embodiments disclosed herein are provided to
facilitate operation of the impeller 166 of the drainage pump 165
by removing the air pocket formed in the drainage chamber 161 of
the drainage unit 160. A process of removing the air pocket may be
repeatedly performed in the water supply step (S110), the
preliminary washing step (S120), the main washing, step (S130) and
the rinsing step (S140) during which water supply is performed
Alternatively, the process of removing the air pocket may be
performed only in the water supply step (S110), for example, during
which wash water is initially supplied.
[0053] Hereinafter, a process of removing air pocket 161b will be
described which is performed only in the water supply step (S110)
for supplying the wash water initially. Referring to the drawings,
operation of the drainage unit in accordance with an embodiment
will be described.
[0054] FIG. 6 is a flow chart illustrating operation of the
drainage pump to remove an air pocket in accordance with an
embodiment. As discussed above, the water supply step (S110) starts
to be performed, and the supplied wash water is drawn into the
drainage chamber 161 via the outlet hole 146 of the sump 140. The
supplied wash water may fill in the internal space of the drainage
chamber 161.
[0055] In this instance, the wash water supplied to the drainage
chamber 161 may fill to the height (H1), that is, to the upper end
of the outlet hole 146 located in the center of the drainage
chamber 161. Alternatively, the supplied wash water may fill to the
height (H2), that is, to the upper end of the outlet pipe 162
according to the arrangement of the drainage pipe 163.
[0056] A control unit or controller may determine whether a water
level of the wash water after the water supply step (S110) starts
is located between the height (H1), that is, the upper end of the
outlet hole 146, and the height (H2), that is, the upper end of the
outlet pipe 162 (S210). The determination of the water level may be
performed based on a water supply time. In other words, it may be
determined that the wash water level in the drainage chamber 161 is
between the height (H1), that is, the upper end of the outlet hole
146, and the height (H2), that is the upper end of the outlet pipe
162, when a preset or predetermined time passes after the water
supply starts.
[0057] The control unit may operate the motor 168 intermittently to
exhaust the air remaining in the drainage chamber 161 via the
outlet pipe 162 (S220). The motor 168 may be rotated in a same
direction as the wash water is drained. The impeller 166 may be
rotated along with the rotation of the motor 168 and the wash water
together with air inside of the drainage chamber 161 may be
exhausted along with the rotation of the impeller 166.
[0058] The rotation of the motor 168 may be performed
intermittently. The intermittent rotation may be performed for
approximately 1.about.2 sec. and then paused for approximately
1.5.about.2.5 sec. and the intermittent rotation may be repeatedly
performed two through four times. The wash water in the drainage
chamber 161 may fluctuate and be partially drained together with
air by the intermittent rotation at the same time, so that the air
pocket formed in the drainage chamber 161 may be minimized.
[0059] Next, referring to the accompanying drawings, operation, of
the drainage unit in accordance with another embodiment will be
described.
[0060] FIG. 7 is a flow chart illustrating operation of the
drainage pump to remove an air pocket in accordance with another
embodiment. As discussed above, the water supply step (S110) may be
performed and the supplied wash water drawn into the drainage
chamber 161 via the outlet hole 146 of the sump 140. The wash water
drawn into the drainage chamber 161 may fill the drainage chamber
161.
[0061] The wash water supplied to the drainage chamber 161 may fill
up to height (H1) which reaches the upper end of the outlet hole
146 located in the center of the drainage chamber 161 or the height
(H2) which reaches the upper end of the outlet pipe 162 according,
to the arrangement of the drainage pipe 163. The control unit may
determine whether a water level of the wash water after the water
supply step (S110) starts is located between the height (H1), that
is, the upper end of the outlet hole 146, and the height (H2), that
is, the upper end of the outlet pipe 162 (S310).
[0062] The determination of the wash water level may be performed
based on an accumulation of the supplied wash water amount. In
other words, once the wash water supply starts, a water flow sensor
provided in the water supply unit may determine whether the wash
water level, in the drainage chamber 161 is located between the
height (H1), that s, the upper end of the outlet hole 146, and the
height (H2) that is, the upper end of the outlet pipe 162.
[0063] Thus, the control unit operates the motor 168 intermittently
to exhaust the air remaining in the drainage chamber 161 via the
outlet pipe 162 (S320). The motor 168 may be rotated in the same
direction as the wash water drained. The impeller 166 may be
rotated along with the rotation of the motor 168 and the wash water
together with air inside of the drainage chamber 161 may be
exhausted along with the rotation of the impeller 166.
[0064] The rotation of the motor 168 may be performed
intermittently. The intermittent rotation may be performed for
approximately 1.about.2 sec. and then paused for approximately
1.5.about.2.5 sec. and the intermittent rotation may be repeatedly
operated two through four times. The wash water in the drainage
chamber 161 may fluctuate and be partially drained together with
air by the intermittent rotation at the same time, so that the air
pocket formed in the drainage chamber 161 may minimized.
[0065] Accordingly, embodiments disclosed herein address the
above-noted and other problems and provide a method for controlling
a dishwasher which is capable of securing operational environments
for a drainage pump by facilitating exhaustion of air remaining in
a drainage pump, while water is supplied to the dishwasher.
[0066] Embodiments disclosed herein provide a method for
controlling a dishwasher that may include a water supply step or
operation for supplying wash water to the dishwasher; an air
exhausting step, or operation for exhausting the air remaining in a
path of the wash water in the water supply step; a washing step or
operation for washing dishes by injecting wash water tea the
dishes; a rinsing, step or operation for rinsing the dishes; and a
drying step or operation for drying the dishes. The air exhausting
step may be performed in a preset or predetermined time period when
the water supply step starts to be performed.
[0067] The exhausting step may be performed after a preset or
predetermined amount of wash water is supplied in the water supply
step. The air exhausting step may operate a drainage pump for
draining the wash water.
[0068] The drainage pump may include a drainage pump, in which wash
water may be stored; an impeller that drains the wash water from
the drainage chamber; and a drainage path connected to the drainage
chamber. The air exhausting step may rotate the impeller in a
preset or predetermined direction in which the air is rotated to
move toward the drainage path.
[0069] The air exhausting step may repeatedly and intermittently
operate the drainage pump for a preset or predetermined time
period. The air exhausting step may repeat the intermittent
operation process in which the drainage pump operates for
approximately 1.about.2 seconds and pause the drainage pump for
approximately 1.5.about.2.5 seconds.
[0070] Embodiments disclosed herein may also provide a method for
controlling a dishwasher including a washing tub that defines a
washing space in which one or more dishes may be placed; an
injection unit that injects wash water to the dishes; a sump
provided underneath the washing tub; a driving unit or drive that
supplies and circulates the wash water stored in the sump to the
injection unit; and a drainage pump that drains the wash water from
the sump. The, method for controlling the dishwasher may include a
water supply step or operation for supplying wash water to the
dishwasher; a washing step or operation for washing dishes using
the wash water; a rinsing step or operation for rinsing the washed
dishes; and a drying step or operation for drying the dishes. The
method may further include an air exhausting step or operation for
operating the drainage pump for a preset or predetermined time
period to exhaust air from the drainage pump after the water supply
step.
[0071] The drainage pump may include a drainage pump in which wash
water may be stored; an impeller that drains the wash water from
the drainage chamber; and a drainage path connected to the drainage
chamber. The air exhausting step may rotate the impeller in a
preset or predetermined direction in which the air is rotated to
move toward the drainage path. The air exhausting step may
repeatedly and intermittently operate the drainage pump for a
preset or predetermined time period.
[0072] The air exhausting step may repeat the intermittent
operation process in which the drainage pump operates for
approximately 1.about.2 seconds and pause the drainage pump for
approximately 1.5.about.2.5 seconds. The air exhausting step may be
performed in a preset or predetermined time period when the water
supply step starts to be performed. The air exhausting step may be
performed after a preset or predetermined amount of wash water is
supplied in the water supply step.
[0073] The embodiments have at least the following advantageous
effect. The method for controlling a dishwasher is capable of
securing operational environments for a drainage pump by
facilitating exhaustion of air remaining in a drainage pump, while
water is supplied to the dishwasher.
[0074] Further scope of applicability will become apparent from the
detailed description given hereinafter. However, it should be
understood that the detailed description and specific examples,
while indicating embodiments, are given by illustration only, since
various changes and modifications within the spirit and scope will
become apparent to those skilled in the art from this detailed
description.
[0075] The embodiments are merely exemplary and are not to be
considered as limiting. The teachings, can be readily applied to
other types of methods and apparatuses. This description is
intended to be illustrative, and not to limit the scope of the
claims. Many alternatives, modifications, and variations will be
apparent to those skilled in the art. The features, structures,
methods, and other characteristics of the embodiments described
herein may be combined in various ways to obtain additional and/or
alternative embodiments. As the present features may be embodied in
several forms without departing from the characteristics thereof,
it should also be understood that the above-described embodiments
are not limited by any of the details of the foregoing description,
unless otherwise specified, but rather should be considered broadly
within its scope as defined in the appended claims, and therefore
all changes and modifications that fall within the metes and bounds
of the claims, or equivalents of such metes and bounds, are
therefore intended to be embraced by the appended claims.
[0076] Any reference in this specification to "one embodiment," "an
embodiment," "example embodiment," etc., means that a particular
feature, structure, or characteristic described in connection with
the embodiment is included in at least one embodiment. The
appearances of such phrases in various places in the specification
are not necessarily all referring to the same embodiment. Further,
when a particular feature, structure, or characteristic is
described in connection with any embodiment, it is submitted that
it is within the purview of one skilled in the art to effect such
feature, structure, or characteristic in connection with other ones
of the embodiments.
[0077] Although embodiments have been described with reference to a
number of illustrative embodiments thereof, it should be understood
that numerous other modifications and embodiments can be devised by
those skilled in the art that will fall within the spirit and scope
of the principles of this disclosure. More particularly, various,
variations and modifications are possible in the component parts
and/or arrangements of the subject combination arrangement within
the scope of the disclosure, the drawings and the appended claims.
In addition to variations and modifications in the component parts
and/or arrangements, alternative uses will also be apparent to
those skilled in the art.
* * * * *