BACKGROUND
1. Field
[0001] Embodiments relate to a washing machine having a drain pump to reduce noise.
2. Description of the Related Art
[0002] Generally, a washing machine is an apparatus that washes laundry using frictional
force between the laundry and wash water. One of various kinds of washing machines
is a drum washing machine. Hereinafter, a drum washing machine will be described by
way of example.
[0003] A conventional drum washing machine includes a tub in which wash water is stored,
a rotating tub rotatably mounted in the tub, a drive device to rotate the rotating
tub, a water supply device to supply wash water into the tub, and a drain pump to
forcibly discharge the wash water from the tub.
[0004] The drain pump generally includes a pump case in which a filter chamber and a drain
pump chamber are defined, and a pump motor coupled to the pump case. The filter chamber
contains a filter to capture impurities contained in wash water, and the drain pump
chamber contains an impeller to be rotated by the pump motor.
[0005] If the impeller is rotated by the pump motor, the interior wash water of the tub
is introduced into the filter chamber, and then, after passing through the filter
placed in the filter chamber, is suctioned into the drain pump chamber. Thereafter,
the wash water is forcibly discharged from the drain pump chamber to the outside of
the drain pump via rotation of the impeller.
[0006] During the above described pumping of wash water, air mixed in the wash water may
be introduced into the drain pump. If the air is introduced into the drain pump, the
air may deteriorate the performance of the impeller placed in the drain pump chamber,
causing drain malfunction or abnormal noise generation.
SUMMARY
[0007] US 2007/256458 A1 discloses a washing machine with a body, a tub, and a drum. Also a pump case of a
corresponding drain pump is arranged, which comprises a wash water inlet and a drain
pump chamber. In the drain pump chamber, an impeller is arranged. Between the wash
water inlet chamber and the drain pump chamber, a guide panel as part of a drain filter
is arranged. The guide panel is in particular used for guiding the insertion of the
filter member into the drain casing.
[0008] US 2007/0240457 A1 discloses a washing machine with a body, a tub, and a drum. The first drain hose
and a second drain hose are both connected to a drain device, which comprises a drain
casing. The drain casing comprises a wash water inlet chamber and a drain pump chamber
with a circular outlet therebetween. This outlet is arranged in the middle of an impeller.
[0009] It is an object of the present application to provide a washing machine with a particular
structure of a wash water inlet chamber and a drain pump chamber to prevent air to
be directed into the drain pump chamber and to increase efficiency of the impeller
and to reduce the generation of noise by the impeller.
[0010] The corresponding object is solved by the features of claim 1. The advantageous embodiments
are disclosed by the sub-claims.
[0011] A partition may be arranged between the wash water inlet chamber and the drain pump
chamber, and the wash water suction part and the air discharge path may be formed
at the partition.
[0012] The air discharge path may be located higher than the wash water suction port.
[0013] A cross sectional area of the air discharge path may be smaller than the cross sectional
area of the wash water suction port.
[0014] The wash water inlet port may be located higher than the wash water suction port.
[0015] An upper inner wall surface of the wash water inlet port may be connected to an upper
inner wall surface of the wash water inlet chamber without a stepped portion. The
wash water outlet port may be located close to the air discharge path, to allow the
air introduced into the drain pump chamber to be directly discharged through the wash
water outlet port, rather than staying in the drain pump chamber.
[0016] A cross sectional area of the wash water outlet port may be smaller than a cross
sectional area of the wash water suction port.
[0017] The wash water suction port may protrude from the partition into the wash water inlet
chamber.
[0018] An upper inner wall surface of the wash water inlet port may be connected to an upper
inner wall surface of the wash water inlet chamber in a tangential direction.
[0019] Therefore, it is an aspect to provide a drain pump to discharge air introduced therein
to reduce noise, and a washing machine having the same.
[0020] Additional aspects will be set forth in part in the description which follows and,
in part, will be obvious from the description, or may be learned by practice of the
embodiments.
[0021] An upper inner wall surface of the wash water inlet port may be connected to an upper
inner wall surface of the wash water inlet chamber without a stepped portion.
[0022] The wash water outlet port may be located close to the air discharge path, to allow
the air introduced into the drain pump chamber to be directly discharged through the
wash water outlet port, rather than staying in the drain pump chamber.
[0023] A cross sectional area of the wash water outlet port may be smaller than a cross
sectional area of the wash water suction port.
[0024] The wash water suction port may protrude from the partition into the wash water inlet
chamber.
[0025] An upper inner wall surface of the wash water inlet port may be connected to an upper
inner wall surface of the wash water inlet chamber in a tangential direction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] These and/or other aspects of the embodiments will become apparent and more readily
appreciated from the following description of the embodiments, taken in conjunction
with the accompanying drawings of which:
FIG. 1 is a sectional view illustrating a general configuration of a washing machine
according to an embodiment;
FIG. 2 is a perspective view illustrating a drain pump according to the embodiment;
FIG. 3 is a sectional view of the drain pump taken along the line I-I of FIG. 2;
FIG. 4 is a sectional view of the drain pump taken along the line II-II of FIG. 2;
FIG. 5 is a sectional view of the drain pump taken along the line III-III of FIG.
2; and
FIG. 6 is a view illustrating operation of the drain pump provided in the washing
machine according to the embodiment.
DETAILED DESCRIPTION
[0027] Reference will now be made in detail to an embodiment, examples of which are illustrated
in the accompanying drawings, wherein like reference numerals refer to like elements
throughout.
[0028] FIG. 1 is a sectional view illustrating a general configuration of a washing machine
according to an embodiment.
[0029] As illustrated in FIG. 1, the washing machine according to the embodiment includes
a body 10 defining an external appearance of the washing machine, a tub 11 mounted
in the body 10, in which wash water is stored during a washing operation, and a rotating
tub 12 rotatably mounted in the tub 11.
[0030] The body 10 has an input opening 13 perforated in a front wall thereof to allow a
user to put laundry into the rotating tub 12. A door 14 is provided to open or close
the input opening 13.
[0031] A water supply device 20 and a detergent supply device 30 are mounted in an upper
region of the body 10 to supply wash water and detergent into the tub 11. The water
supply device 20 includes water supply valves 21 to control the supply of wash water,
water supply pipes 22 connecting the water supply valves 21 to the detergent supply
device 30, and a connecting pipe 23 to guide the wash water, having passed through
the detergent supply device 30, into the tub 11.
[0032] The tub 11 is externally provided with a drive motor 41, which rotates the rotating
tub 12 forwardly or reversely. A drive shaft 42 is mounted between the rotating tub
12 and the drive motor 41 to transmit rotation force of the drive motor 41 to the
rotating tub 12. In addition, a bearing housing 43 is mounted to a rear wall of the
tub 11 to rotatably support the drive shaft 42, and a bearing 44 is interposed between
the bearing housing 43 and the drive shaft 42.
[0033] A drain pump 100 is mounted on an inner bottom surface of the body 10 to pump the
wash water stored in the tub 11. The drain pump 100 is connected to the tub 11 via
a first drain pipe 50. In the embodiment, the drain pump 100 serves to pump the wash
water drained through the first drain pipe 50 to forcibly discharge the wash water
to the outside of the body 10.
[0034] FIG. 2 is a perspective view illustrating the drain pump according to the embodiment,
FIG. 3 is a sectional view of the drain pump taken along the line I-I of FIG. 2, FIG.
4 is a sectional view of the drain pump taken along the line II-II of FIG. 2, and
FIG. 5 is a sectional view of the drain pump taken along the line III-III of FIG.
2. In FIG. 3, a pump filter mounted in a wash water inlet chamber is not illustrated.
[0035] As illustrated in FIGS. 2 to 5, the drain pump 100 includes a pump case 101 in which
a wash water inlet chamber 110 and a drain pump chamber 120 are defined, and a pump
filter 102 mounted in the wash water inlet chamber 110.
[0036] The pump case 101 has a cylindrical shape and is provided with a bracket 103 to couple
the pump case 101 to the body 10. Both ends of the cylindrical pump case 101 are open.
The pump filter 102 and an impeller 121 that will be described hereinafter are coupled
respectively to both the open ends of the cylindrical pump case 101. The cylindrical
pump case 101 is coupled to the body 10 such that a peripheral portion of the cylindrical
pump case 101 faces the bottom surface of the body 10.
[0037] The wash water inlet chamber 110 is defined in the pump case 101. During operation
of the drain pump 100, the wash water stored in the tub 11 is introduced into the
wash water inlet chamber 110 through the first drain pipe 50.
[0038] The drain pump 100 further includes a wash water inlet port 130 provided at a lateral
position of a peripheral surface of the pump case 101. The wash water inlet port 130
internally communicates with the wash water inlet chamber 110 and is externally connected
to the first drain pipe 50. The wash water having passed through the first drain pipe
50 is introduced into the wash water inlet chamber 110 through the wash water inlet
port 130. The wash water inlet port 130 may have a circular shape, and may protrude
outward from the pump case 101 for connection with the first drain pipe 50. In this
case, the wash water inlet port 130 may protrude parallel to the bottom surface of
the body 10.
[0039] In this case, the center of the wash water inlet port 130 is located higher than
the center of the pump case 101. This serves to minimize the amount of air to be suctioned
into the drain pump chamber 120 along with the wash water. The air moves upward of
the wash water within the wash water inlet chamber 110 because the air is lighter
than the wash water and during this movement, may be suctioned into the drain pump
chamber 120. However, highly positioning the wash water inlet port 130 may reduce
the above described movement path, thereby minimizing the amount of air to be suctioned
into the drain pump chamber 120 and preventing generation of noise due to movement
of the wash water.
[0040] An upper inner wall surface of the wash water inlet port 130 may be connected in
a tangential direction to an upper inner wall surface of the wash water inlet chamber
110 without a stepped portion. That is, this tangential arrangement of the wash water
inlet port 130 and the wash water inlet chamber 110 may be effective in collecting
the air in an upper region of the wash water inlet chamber 110 and reducing generation
of noise due to movement of the wash water.
[0041] The wash water inlet port 130 is located higher than a wash water suction port 150
that will be described hereinafter. The air introduced along with the wash water is
located above the wash water and therefore, positioning the wash water inlet port
130 higher than the wash water suction port 150 may minimize the amount of air to
be introduced, along with the wash water, into the drain pump chamber 120 through
the wash water suction port 150.
[0042] The drain pump chamber 120 is adapted to suction the wash water introduced into the
wash water inlet chamber 110 and discharge the wash water to the outside of the body
10. The wash water inlet chamber 110 and the drain pump chamber 120 may be neighbor
to each other in a longitudinal direction within the cylindrical pump case 101.
[0043] The impeller 121 is mounted in the drain pump chamber 120 and serves to forcibly
suction the wash water from the wash water inlet chamber 110 and discharge the wash
water from the drain pump chamber 120. A pumping motor 122 is connected to the impeller
121. As the impeller 121 is rotated by the pumping motor 122, The impeller 121 suctions
the interior wash water of the wash water inlet chamber 110 in a lateral direction
and discharges the wash water in a radial direction.
[0044] The drain pump 100 further includes a wash water outlet port 140 provided at an upper
position of the peripheral surface of the pump case 101. The wash water outlet port
140 internally communicates with the drain pump chamber 120 and is externally connected
to a second drain pipe 60. All the wash water suctioned into the drain pump chamber
120 and the air directed into the drain pump chamber 120 through an air discharge
path 160 that will be described hereinafter are discharged out of the body 10 through
the wash water outlet port 140 and the second drain pipe 60. The wash water outlet
port 140 may be oriented perpendicular to the bottom surface of the body 10. In this
case, the wash water inlet port 130 provided at the lateral position of the pump case
101 and the wash water outlet port 140 provided at the upper position of the pump
case 101 are perpendicular to each other. The wash water outlet port 140 may have
a circular shape, and may protrude outward from the pump case 101 for connection with
the second drain pipe 60.
[0045] The air is introduced into the drain pump chamber 120 through the air discharge path
160. The wash water outlet port 140 is located close to the air discharge path 160,
to allow the air having passed through the air discharge path 160 to be directly discharged
rather than staying in the drain pump chamber 120. The wash water outlet port 140
may be located at a distance of 10 mm or less from the air discharge path 160.
[0046] To allow the air to be moved from the wash water inlet chamber 110 to the drain pump
chamber 120 under a pressure difference, the wash water passing through the wash water
outlet port 140 may have a higher velocity than that of the wash water passing through
the wash water suction port 150. If the area of an exit is smaller than the area of
an entrance, the velocity of a fluid at the exit may be increased. Since the wash
water suction port 150 corresponds to the entrance of the drain pump chamber 120 and
the wash water outlet port 140 corresponds to the exit of the drain pump chamber 120,
the velocity of the wash water passing through the wash water outlet port 140 may
be increased if the area of the wash water outlet port 140 is smaller than the area
of the wash water suction port 150. Accordingly, the area of the wash water outlet
port 140 may be smaller than the area of the wash water suction port 150.
[0047] The wash water suction port 150 is located between the wash water inlet chamber 110
and the drain pump chamber 120. The wash water inlet chamber 110 and the drain pump
chamber 120 are arranged side by side within the pump case 101 and communicate with
each other through the wash water suction port 150. If the drain pump 100 is operated,
the wash water introduced into the wash water inlet chamber 110 is suctioned into
the drain pump chamber 120 through the wash water suction port 150.
[0048] The air discharge path 160 is located between the wash water inlet chamber 110 and
the drain pump chamber 120, to allow the air inside the wash water inlet chamber 110
to be discharged through the wash water outlet port 140. A conventional drain pump
uses an additional air discharge pipe, and this increases the number of places that
necessitate leakage management and an additional operation of connecting the air discharge
pipe to the drain pump and the tub increases the number of overall processes. In the
drain pump 100 according to the embodiment, the air discharge path 160 substitutes
for the air discharge pipe, allowing the air introduced into the wash water inlet
chamber 110 during pumping of the wash water to be directed into the drain pump chamber
120 and consequently, be discharged out of the drain pump 100.
[0049] One end of the air discharge path 160 communicates with the wash water inlet chamber
110 and the other end communicates with the drain pump chamber 120. The air discharge
path 160 may have a constant cross sectional area from one end to the other end thereof.
The air inside the wash water inlet chamber 110 is directed into the drain pump chamber
120 through the air discharge path 160, and then, is discharged to the outside of
the body 10 through the wash water outlet port 140 and the second drain pipe 60. Differently
from the wash water that is suctioned into the drain pump chamber 120 by rotation
force of the impeller 121, the air is directed into the drain pump chamber 120 under
a pressure difference between one end and the other end of the air discharge path
160.
[0050] The air discharge path 160 may be located to communicate the wash water inlet chamber
110 and the drain pump chamber 120 with each other at a position as high as possible,
and at least, may be located higher than the wash water suction port 150.
[0051] The air discharge path 160 has an exit communicating with the drain pump chamber
120, and the exit of the air discharge path 160 is located at a radial outward position
of the impeller 121. This may serve to prevent the air directed into the drain pump
chamber 120 from coming into direct contact with the impeller 121, thereby preventing
deterioration in the rotation efficiency of the impeller 121 and generation of noise.
[0052] In addition, to minimize the amount of wash water to be directed from the wash water
inlet chamber 110 into the drain pump chamber 120 through the air discharge path 160
and also, to prevent the wash water, which is moving at a high velocity toward the
wash water outlet port 140, from moving backward into the wash water inlet chamber
110 through the air discharge path 160, the air discharge path 160 may have a smaller
cross sectional area than those of the wash water suction port 150 and the wash water
outlet port 140.
[0053] The drain pump 100 may further include a partition 170 placed between the wash water
inlet chamber 110 and the drain pump chamber 120. The wash water suction port 150
and the air discharge path 160 are formed at the partition 170. The wash water suction
port 150 may protrude from the partition 170 into the wash water inlet chamber 110
to define a protruding entrance. If the protruding entrance of the wash water suction
port 150 is located close to the wash water inlet port 130, the wash water introduced
through the wash water inlet port 130 may be directly suctioned into the drain pump
chamber 120 through the protruding entrance of the wash water suction port 150 without
undergoing unnecessary movement in the wash water inlet chamber 110. In addition,
the protruding entrance of the wash water suction port 150 may define an air accommodation
space between the upper inner wall surface of the wash water inlet chamber 110 and
an outer peripheral surface of the wash water suction port 150, thereby minimizing
the amount of air to be suctioned into the drain pump chamber 120 through the wash
water suction port 150.
[0054] The pump filter 102 includes a head portion 102a coupled to the pump case 101, and
a filter portion (not shown) placed in the wash water inlet chamber 110 to capture
impurities contained in the wash water introduced into the wash water inlet chamber
110. A periphery of the head portion 102a is fastened to the pump case 101 by screws,
and a grip 102b is provided at a front surface of the head portion 102a to allow a
user to grip and rotate the head portion 102a.
[0055] FIG. 6 is a view illustrating operation of the drain pump in the washing machine
according to the embodiment. Hereinafter, operation of the pump according to the embodiment
will be described with reference to FIG. 6. The impeller 121 mounted in the drain
pump chamber 120 is driven when draining the wash water. If the impeller 121 is rotated,
the interior wash water of the tub 11 is introduced into the wash water inlet chamber
110 through the first drain pipe 50 and the wash water inlet port 130, and then, is
suctioned into the drain pump chamber 120 through the wash water suction port 150.
Subsequently, by operation of the impeller 121, the wash water suctioned into the
drain pump chamber 120 is forcibly directed to the wash water outlet port 140 and
is discharged to the outside through the second drain pipe 60 (FIG. 2).
[0056] During the pumping of the wash water, the air mixed in the wash water is introduced
into the wash water inlet chamber 110. Since the air is lighter than the wash water,
the air is located in the upper region of the wash water inlet chamber 110. In this
way, the air is located at one side of the air discharge path 160 communicating with
the wash water inlet chamber 110, whereas the wash water moves at a high velocity
toward the wash water outlet port 140 at the other side of the air discharge path
160 communicating with the drain pump chamber 120. Since one side of the air discharge
path 160 has a higher pressure than the other end of the air discharge path 160, the
air is directed into the drain pump chamber 120 through the air discharge path 160.
Thereby, the air is discharged to the outside of the washing machine through the wash
water outlet port 140 and the second drain pipe 60 along with the wash water.
[0057] As is apparent from the above description, in a drain pump of a washing machine according
to an embodiment, a wash water inlet port of the drain pump is located higher than
the center of a pump case of the drain pump such that air is located in an upper region
of the drain pump. This may effectively prevent the air from being suctioned toward
the impeller. In particular, the drain pump is configured such that wash water is
introduced in a tangential direction of an upper inner surface of the drain pump.
This may reduce generation of noise due to movement of the wash water within the drain
pump.
[0058] Further, the drain pump may discharge the air, introduced into the drain pump during
pumping of the wash water, to the outside without using a separate air discharge pipe
or hose. This may minimize the number of pipes to be connected to the drain pump and
consequently, reduce the number of places that necessitate leakage management. Furthermore,
it may be possible to omit an operation of connecting the separate air discharge pipe
or hose to the pump and a tub of the washing machine.
[0059] Although a few embodiments have been shown and described, it would be appreciated
by those skilled in the art that changes may be made in these embodiments without
departing from the principles of the invention, the scope of which is defined in the
claims.