EP3252197A1 - Laundry treatment apparatus and method of controlling the same - Google Patents
Laundry treatment apparatus and method of controlling the same Download PDFInfo
- Publication number
- EP3252197A1 EP3252197A1 EP17173494.0A EP17173494A EP3252197A1 EP 3252197 A1 EP3252197 A1 EP 3252197A1 EP 17173494 A EP17173494 A EP 17173494A EP 3252197 A1 EP3252197 A1 EP 3252197A1
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- EP
- European Patent Office
- Prior art keywords
- tub
- water
- treatment apparatus
- laundry treatment
- door
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F29/00—Combinations of a washing machine with other separate apparatus in a common frame or the like, e.g. with rinsing apparatus
Definitions
- the present application relates to a laundry treatment apparatus and a method of controlling the same.
- a laundry treatment apparatus is a concept including an apparatus that is capable of washing laundry (objects to be washed), an apparatus that is capable of drying laundry (objects to be dried), and an apparatus that is capable of washing and drying laundry.
- Conventional laundry treatment apparatuses are classified into a front loading type laundry treatment apparatus, into which laundry is introduced through an introduction port provided in the front thereof, and a top loading type laundry treatment apparatus, into which laundry is introduced through an introduction port provided in the top thereof.
- the top loading type laundry treatment apparatus includes a tub having an introduction port provided in the top thereof, a drum rotatably provided in the tub, and a door for opening and closing the introduction port.
- a single large-capacity laundry treatment apparatus is used in each home.
- the laundry treatment apparatus When laundry is to be sorted into respective kinds for washing, therefore, the laundry treatment apparatus must be used several times. For example, when laundry, such as adult clothes, and laundry, such as underwear or baby clothes, are to be separately washed, the laundry treatment apparatus is used to wash the former kind of laundry, and then the laundry treatment apparatus is used to wash the latter kind of laundry. As a result, washing time is increased, and power consumption is also increased.
- a washing course set in the large-sized laundry treatment apparatus is generally used to wash a large amount of laundry, water consumption is high. Furthermore, power consumption to rotate a large-sized drum or inner tub is also high. In addition, since the washing course is used to wash a large amount of laundry, the washing time is relatively long. Furthermore, since the washing course set in the large-sized laundry treatment apparatus is mainly used for general clothes, the large-sized laundry treatment apparatus may not be suitable for washing delicate clothes, such as underwear or baby clothes.
- the large-sized laundry treatment apparatus is also not suitable for frequently washing small amounts of laundry. Consumers tend to gather laundry for several days or more in order to wash laundry at once.
- the top loading type laundry treatment apparatus is provided on or under the front loading type laundry treatment apparatus in order to wash a small amount of laundry, thereby improving space utilization.
- the height of the top loading type laundry treatment apparatus which is an auxiliary laundry treatment apparatus, is limited. If the top loading type laundry treatment apparatus is high, the washing capacity of the apparatus is increased. In this case, however, it may be difficult for a user to access the top loading type laundry treatment apparatus, since the top loading type laundry treatment apparatus is provided on the front loading type laundry treatment apparatus. For this reason, it is preferable to configure the top loading type laundry treatment apparatus such that the top loading type laundry treatment apparatus is lower than conventional top loading type laundry treatment apparatuses.
- the laundry treatment apparatus particularly the top loading type laundry treatment apparatus, which has a relatively small capacity, is characterized in that the distance between the introduction port and the upper end of the drum is very small.
- washing must be performed in the state in which the laundry treatment apparatus is substantially sealed in order to prevent wash water or bubbles from being discharged to the outside.
- wash water is introduced into the space and is discharged from the space and that the pressure in the space may be abruptly changed as a result of change in temperature, resulting in the damage to components in the space.
- the present invention is directed to a laundry treatment apparatus and a method of controlling the same that substantially obviate one or more in problems due to limitations and disadvantages of the related art.
- One object of the present invention is to provide a laundry treatment apparatus that is capable of preventing abrupt negative pressure from being generated in a tub and a method of controlling the same.
- Another object of the present invention is to provide a laundry treatment apparatus that is capable of preventing abrupt negative pressure from being generated in a tub irrespective of the temperature of water supplied from the outside and a method of controlling the same.
- Another object of the present invention is to provide a laundry treatment apparatus that is capable of preventing a door from being deformed or opened by negative pressure in a tub and a method of controlling the same.
- Another object of the present invention is to provide a laundry treatment apparatus that is capable of preventing instantaneously high negative pressure from being generated in a tub and a method of controlling the same.
- Another object of the present invention is to provide a laundry treatment apparatus that is capable of preventing instantaneously abrupt negative pressure from being generated in a tub due to the amount of air being greater than the amount of air flowing per unit time between the inside and the outside of the tub and a method of controlling the same.
- Another object of the present invention is to provide the structure of a tub that is capable of allowing air to be introduced thereinto and to be discharged therefrom and of maximally preventing the introduction and discharge of wash water and bubbles and a laundry treatment apparatus including the same.
- a further object of the present invention is to provide a laundry treatment apparatus configured such that an air channel is formed in a tub cover located at the uppermost side of space, and the tub cover is coupled to a tub, whereby the manufacture of the laundry treatment apparatus is easy and the structure of the laundry treatment apparatus is simple.
- a method of controlling a laundry treatment apparatus including a tub for storing wash water, an introduction port provided in the upper surface of the tub, and a door for opening and closing the introduction port, includes a washing course selection step of selecting a heating course in which laundry is heated, a water supply step of supplying water to the tub, a heating step of heating the water stored in the tub, a negative pressure prevention step of performing intermittent water supply to supply water into the tub for a first predetermined amount of time and to interrupt the supply of water for a second predetermined amount of time, a washing water supply step of supplying water to a washing level for washing after the negative pressure prevention step, and a main washing step.
- the second predetermined amount of time may be longer than the first predetermined amount of time.
- the intermittent water supply may be repeated N1 times at the negative pressure prevention step.
- the method may include an initial level sensing step of sensing the initial level of water in the tub before the water supply step.
- the intermittent water supply may be repeated N2 times at the negative pressure prevention step.
- the negative pressure prevention step may include a comparative level sensing step of performing intermittent water supply N3 times and sensing a comparative level of water and a water level comparison step of comparing the sensed initial level of water with the sensed comparative level of water.
- the comparative level of water in the tub may be sensed within the second predetermined amount of time included in each time period for intermittent water supply.
- the highest one of the comparative levels of water sensed N3 times may be selected as the comparative level of water sensed at the water level comparison step.
- the method may include an additional water supply step of further performing intermittent water supply N4 times based on the result of comparison between the comparative level of water and the initial level of water at the water level comparison step.
- water may be directly supplied to the washing level without additional intermittent water supply, and then main washing may be performed.
- the number of times of additional intermittent water supply may be increased.
- a laundry treatment apparatus includes a cabinet having a first opening and a second opening, a first cabinet door and a second cabinet door provided at the cabinet for opening and closing the first opening and the second opening, respectively, a first washing apparatus provided in the cabinet for treating laundry introduced from the front after the first cabinet door is opened, and a second washing apparatus for treating laundry introduced from above after the second cabinet door is opened, wherein the second washing apparatus includes a tub provided so as to be accessible after the second opening is opened through the second cabinet door, the tub being configured to store water, the upper part of the tub being open, a tub cover located at the upper part of the tub for covering the upper part of the tub, a drum provided in the tub so as to be rotatable about a vertical shaft, and an air channel unit formed in the tub cover for allowing air to communicate between the inside and the outside of the tub therethrough, and wherein the tub cover is coupled to the tub so as to allow air to communicate between the inside and the outside of the tub through the air channel unit.
- the tub cover may be configured to allow air to communicate between the inside and the outside of the tub only through the air channel unit.
- the tub cover may include a tub cover body coupled to the tub, the tub cover body being provided with an introduction port, through which laundry is introduced, and a tub door provided at the tub cover body for opening and closing the introduction port.
- the air channel unit may includes an air hole formed in the tub cover body.
- the tub cover body may be provided with a water supply port located at the rear of the introduction port for allowing water to be supplied into the tub from an external water supply source therethrough, and the air hole may be provided at the rear of the introduction port.
- the air hole may be provided between the introduction port and the water supply port.
- the air hole may include a first air hole and a second air hole having a larger sectional area than the first air hole.
- the tub cover body may be provided in the upper surface thereof with a recess that extends downward, and the air hole may include a plurality of air holes formed in the bottom surface of the recess.
- Each of the air holes may be provided with a mesh.
- the laundry treatment apparatus may further include a filter mounted to the recess.
- the filter may allow air to pass therethrough, and may prevent water or bubbles from passing therethrough.
- the filter may be configured to absorb water and bubbles introduced through the air holes.
- the air channel unit may be provided at the tub door.
- the air channel unit may include a hollow portion provided in the tub door, a first air channel for allowing the inside of the tub and the hollow portion to communicate with each other, and a second air channel for allowing the outside of the tub and the hollow portion to communicate with each other.
- the tub door may be provided at the lower surface thereof with a sealing portion fixing part to which a sealing portion for sealing the introduction port is fixed, and the hollow portion may be formed above the sealing portion fixing part.
- the sealing portion may form a closed loop, and the air channel unit may extend from the inside to the outside of the closed loop.
- the tub door may include a frame rotatably connected to the tub cover body and a transparent window provided at the frame.
- the air channel unit may be formed in the frame.
- a sealing portion may be provided at an inner surface of the tub door to seal the introduction port.
- the frame may comprise a washing guide to guide water that moves when the drum is rotated toward a center of the transparent window along an inner surface of the transparent window.
- the frame may be configured to surround the window, and the tub door may further include a washing guide provided between the inner edge of the frame and the outer edge of the window for guiding water that moves when the drum is rotated toward the center of the window along the inner surface of the window.
- the air channel unit may include an air hole formed in the tub cover body. Consequently, the air channel units may be formed at both the tub cover body and the tub door.
- the air hole may include a plurality of first air holes and a plurality of second air holes having a larger sectional area than the first air holes.
- the reason for this is that, if the air holes have the same area, the air holes may be simultaneously closed by water film. Consequently, air discharge pressure or speed may be changed to form the optimum air passage structure.
- the tub cover body may be provided in the upper surface thereof with a recess that extends downward, and the air hole may include a plurality of air holes formed in a bottom surface of the recess.
- a member having a channel resistance for allowing air to be discharged but preventing water and bubbles from being discharged may be mounted above the recess.
- the member having the channel resistance may be a sponge type filter or a labyrinth member.
- the laundry treatment apparatus may further include a filter mounted to the recess for allowing air introduced through the air holes to pass therethrough and absorbing water and bubbles introduced through the air holes.
- a laundry treatment apparatus having a tub for storing water, the upper part of the tub being open, a tub cover located at the upper part of the tub for covering the upper part of the tub, and a drum provided in the tub so as to be rotatable about a vertical shaft, includes an air channel unit formed in the tub cover for allowing air to communicate between the inside and the outside of the tub therethrough, wherein the tub cover is coupled to the tub so as to allow air to communicate between the inside and the outside of the tub through the air channel unit.
- an example of a laundry treatment apparatus is a small-sized top loader. That is, the present invention relates to a small-sized washer and, more particularly, to a laundry treatment apparatus that can be used together with a general washer or dryer.
- the laundry treatment apparatus according to the present invention may be located on a washer or a dryer, or may be located under the washer or the dryer.
- the laundry treatment apparatus according to the present invention may be provided together with a general washer or dryer in a single cabinet. Consequently, the volume or height of the laundry treatment apparatus according to the present invention may be smaller than that of the washer or the dryer.
- a laundry treatment apparatus 100 may include a cabinet 2, a drawer 3 configured to be withdrawn from the cabinet, a tub 3 provided in the drawer for storing water, and a drum 5 rotatably provided in the tub for receiving laundry.
- the cabinet 2 may be configured to define the external appearance of the laundry treatment apparatus. Alternatively, the cabinet 2 may be simply configured as space for receiving the drawer 3. In any case, the cabinet 2 may be provided at the front surface thereof with an open surface 21, through which the drawer 2 is inserted.
- the drawer 3 includes a drawer body 31 configured to be inserted into the cabinet 2 through the open surface 21, a drawer panel 33 fixed to the front surface of the drawer body 31 for opening and closing the opening surface 21, and a drawer cover 35 configured to define the upper surface of the drawer body 31.
- the drawer panel 33 may also serve as a handle for withdrawing the drawer body 31 from the cabinet 2, since the drawer panel 33 is fixed to the front surface of the drawer body 31.
- the drawer panel 33 may be provided with a control panel 331 for allowing a user to input a control command related to the operation of the laundry treatment apparatus 100 and for displaying a message related to the operation of the laundry treatment apparatus to the user.
- the drawer body 31 may be inserted into the cabinet 2 through the open surface 21.
- the shape of the drawer body 31 is not particularly restricted, as long as the drawer body 31 provides space for receiving the tub 4.
- FIG. 1 shows a drawer body 31 formed in an empty hexahedral shape by way of example.
- the drawer cover 35 is provided with a first through hole 351 and a second through hole 353, through which the inside and outside of the drawer body 31 communicate with each other.
- the first through hole 351 is provided to introduce laundry
- the second through hole 353 is provided to supply water necessary to wash the laundry, which will be described in detail later.
- the tub 4 includes a tub body 41 located in the drawer body 31 for storing water and a tub cover 43 configured to define the upper surface of the tub body 41.
- the tub 4 may include a tub opening 44a that defines an opened upper surface of the tub body 41.
- the tub cover 43 may cover the tub opening 44a.
- the tub body 41 may be configured as a cylindrical shape that is open at the upper surface thereof.
- a heater 411 for heating water may be provided in the tub body 41.
- the diameter of the tub body 41 is greater than the height of the tub body 41. In other words, the vertical length of the tub body 41 is greater than the horizontal length of the tub body 41.
- the tub cover 43 may include a tub cover body.
- the cover body 44 may be coupled to the tub 4.
- the tub cover 43 may include an introduction port 431, through which the inside and outside of the tub body 41 communicate with each other, and a supply port 433, through which water is supplied into the tub body 41.
- the tub cover 43 covers the open upper surface of the tub body 41 such that the inside and outside of the tub communicate with each other through the introduction port 431.
- the introduction port 431 may be provided under the first through hole 351 provided in the drawer cover, and the supply port 433 may be provided under the second through hole 353 provided in the drawer cover.
- the introduction port 431 is a means for supplying laundry into the tub body 41 or withdrawing the laundry from the tub body 41.
- the introduction port 431 is opened and closed by a door 45.
- the door 45 may include a frame 451 rotatably coupled to the tub cover 43 via a hinge 453, a window 455 provided in the frame, and a door handle 457 for separably coupling the frame 451 to the tub cover 43.
- tub cover 43 may include a tub cover body 44.
- the tub cover body 44 may be coupled to the tub body 41.
- the window 455 may be made of a transparent material such that the user can check the interior of the tub body 41 when the drawer 3 is withdrawn from the cabinet 2.
- One end of the door 45 is connected to the upper surface of the tub cover 43 such that the door 45 is turned to open and close the introduction port 431. When the door 45 closes the introduction port 43, the tub 4 is sealed.
- the space in the tub 4 is not completely physically sealed such that air cannot flow between the inside and the outside of the tub 4.
- the reason for this is that air can flow between the inside and the outside of the tub 4 through a tub air channel unit or a door air channel unit, which will be described later.
- the space in the tub 4 may be described as being sealed in the case in which the amount of air that can flow through a communication part between the inside and the outside of the tub 4 per unit time is much less than the amount of air that must flow between the inside and the outside of the tub 4 per unit time in order to reduce the difference in pressure between the inside and the outside of the tub 4, which instantaneously and abruptly occurs.
- the space in the tub 4 may be instantaneously sealed. That is, when a difference in pressure between the inside and the outside of the tub 4 occurs due to abrupt compression or expansion of air in the tub 4 in the state in which the door 45 is closed, the amount of air per unit time that can flow between the inside and the outside of the tub 4 is much less than the amount of air per unit time that must flow between the inside and the outside of the tub 4 in order to reduce the difference in pressure between the inside and the outside of the tub 4. As a result, negative pressure or positive pressure may be instantaneously and abruptly generated in the tub 4.
- a hook 450 provided at the other end of the door 45 is fastened to a hook hanger 430 provided at the tub cover 43 such that the door 45 is fixed to the tub cover 43.
- the hook hanger 430 may protrude such that the end of the hook 450 is caught by the hook hanger 430.
- the door 45 may be locked and unlocked by a push/open button type locking unit 432. That is, when the upper surface of the door 45 is pushed to close the door 45, the door 45 is locked, and when the upper surface of the door 45 is pushed again to open the door 45, the door 45 is unlocked.
- the locking unit 432 includes a latching protrusion 4322 protruding from the upper surface of the tub cover 43, the latching protrusion 4322 having a fastening hole 4321, and an unlocking part 4323 provided at the inner surface of the door 45.
- the unlocking part 4323 is inserted into the fastening hole 4321 to fix the latching protrusion 4322.
- the unlocking part 4323 is separated from the fastening hole 4321, whereby the coupling between the latching protrusion 4322 and the unlocking part 4323 is released.
- the latching protrusion 4322 may be provided at the door 45
- the unlocking part 4323 may be provided at the tub cover 43.
- the door 45 or the tub cover 43 may be provided with an opening part 4324 for increasing the distance between the door 45 and the tub cover 43.
- the opening part 4324 is provided at the inner surface of the door 45 to provide elastic force toward the tub cover 43. When the door is unlocked, therefore, the door is pushed from the tub cover.
- the laundry treatment apparatus according to the present invention is different from a general top loading type washer in that, in the general top loading type washer, the upper surface of the tub is open and the interior of the tub communicates with the interior of the cabinet, whereas, in the laundry treatment apparatus according to the present invention, however, the upper surface of the tub is closed and the introduction port 431 formed in the upper surface of the tub 4 is sealed by the door 45 rotatably provided at the upper surface of the tub cover 43, whereby the interior of the tub 4 does not communicate with the interior of the cabinet. That is, the interior of the tub 4 is sealed.
- the reason that the upper surface of the tub is closed in the laundry treatment apparatus according to the present invention is that a large amount of bubbles may be generated in the tub 4 due to the rotation of the drum and the generated bubbles may flow outward through the upper surface of the tub, since the height of the tub 4 is smaller than the diameter of the tub 4. In order to solve this problem, the upper surface of the tub is closed.
- any one selected from between the frame 451 and the tub cover 43 may be further provided with a sealing part 459 for sealing the gap between the frame 451 and the introduction port 431 when the door 45 closes the introduction port 431.
- the tub 4 having the above structure is coupled to the drawer body 31 via a tub support unit 6.
- the tub support unit 6 may include a first support part 61 provided at the drawer body 31, a second support part 63 provided at the tub body 41, and a connection part 65 for connecting the first support part and the second support part to each other.
- connection part 65 may include a first connection part 651 located in the first support part 61, a second connection part 653 for supporting the second support part 63, and a bar 655 for connecting the first connection part and the second connection part to each other.
- the first connection part 651 may be formed in a shape in which the first connection part 651 is movable in the first support part 61 while being 651 located in the first support part 61
- the second connection part 653 may be formed in a shape in which the second connection part 653 is movable in the second support part 63 while supporting the second support part 63.
- FIG. 2 shows the case in which each of the first and second connection parts 651 and 653 is formed in a spherical shape by way of example
- FIG. 3 shows the case in which the surface of each of the connection parts 651 and 653 that contacts a corresponding one of the support parts 61 and 63 is formed in a hemispherical shape by way of example.
- the bar 655 may be configured to be perpendicular to the bottom surface of the cabinet 2 (i.e. configured to be parallel to the height direction Z of the cabinet and to be perpendicular to the bottom surface of the drawer).
- At least three tub support units 6 are provided to couple the tub body 41 to the drawer body 31, and the bars 655 are perpendicular to the bottom surface of the cabinet. Consequently, it is possible to increase the distance between the tub cover 43 and the drawer cover 35, compared to the case in which the bars 655 are inclined from the Z axis by a predetermined angle.
- the tub support units 6 included in the embodiment of the present invention may minimize the possibility of the tub cover 43 colliding with the drawer cover 35 even when the tub body 41 vibrates in the drawer body 31.
- At least one of the first and second support parts 61 and 63 may be separably provided at the drawer body 31.
- the gap S between the outer circumferential surface of the tub body 41 and the inner circumferential surface of the drawer body 41 may be minimized, thereby minimizing the volume of the laundry treatment apparatus 100, but the efficiency in assembly of the first connection part 651 and the first support part 61 performed through the above procedure may be deteriorated.
- This problem may be solved in the case in which the first support part 61 is separably provided at the drawer body 41.
- the drum 5, provided in the tub 4, may include a cylindrical drum body 51 having an open surface 53 provided in the upper part thereof.
- the open surface 53 is located under the introduction port 431. Consequently, laundry supplied through the introduction port 431 is introduced into the drum body 51 through the open surface 53.
- the drum body 51 may be provided in the bottom surface 57 and the circumferential surface 55 thereof with a plurality of drum through holes 59, through which the inside of the drum body 51 and the tub body 41 communicate with each other.
- the drum body 51 is rotated in the tub body 41 by a driving unit M (e.g. a motor).
- the driving unit M may include a stator M1 fixed to the bottom surface of the tub body while being located outside the tub body 41, a rotor M2 configured to be rotated by a rotating field provided by the stator, and a shaft M3 extending through the bottom surface of the tub body 41 for connecting the bottom surface 57 of the drum and the rotor M2 to each other.
- the shaft M3 may be perpendicular to the bottom surface of the tub body 41.
- water is supplied to the tub 4 through a water supply unit 7, and the water stored in the tub 4 is discharged out of the cabinet 2 through a drainage unit 8.
- the water supply unit 7 may include a first water supply pipe 71 connected to the supply port 433, which is provided at the tub cover, a second water supply pipe 73 connected to a water supply source located outside the cabinet, and a connection pipe 75 fixed to the tub cover 43 for connecting the first water supply pipe and the second water supply pipe to each other.
- the first water supply pipe 71 may connect the supply port 433 and the connection pipe 75 to each other through the second through hole 353, which is provided in the drawer cover 35, and may be configured as a bellows pipe so as to prevent the first water supply pipe 71 from being separated from the connection pipe 75 when the tub 4 vibrates (see FIG. 3 ).
- the second water supply pipe 73 may also be configured as a bellows pipe so as to prevent the second water supply pipe 72 from being separated from the connection pipe 75 when the drawer is withdrawn from the cabinet 2.
- the second water supply pipe 73 is opened and closed by a water supply valve 77 under the control of a controller 101.
- the water supply unit 7 may include a single water supply pipe for connecting a water supply source (not shown) located outside the cabinet and the supply port 433, which is provided at the tub cover.
- the water supply pipe may be configured as a bellows pipe.
- the drainage unit 8 may include a drainage pump 81 fixed to the drawer body 31, a first drainage pipe 83 for guiding the water from the tub body 41 to the drainage pump 81, and a second drainage pipe 85 for guiding the water discharged from the drainage pump 81 out of the cabinet 2.
- the second drainage pipe 85 may be configured as a bellows pipe.
- the controller 101 controls the operation of the drainage pump 81 such that water from the tub 4 is drained to the outside via the first drainage pipe 83, the drainage pump 81, and the second drainage pipe 85.
- laundry is introduced into the drum 5, water and detergent are supplied into the tub 4, and the drum 5 is rotated by the driving unit to wash the laundry.
- the laundry treatment apparatus 100 may further include at least one selected from between a washing unit 91 for removing foreign matter (e.g. bubbles or dirt) from the door 45 and a spray unit 93 for preventing the generation of bubbles and washing the drum.
- a washing unit 91 for removing foreign matter (e.g. bubbles or dirt) from the door 45
- a spray unit 93 for preventing the generation of bubbles and washing the drum.
- the washing unit 91 shown in FIG. 4 is a means for washing the door 45 using centrifugal force generated during the rotation of the drum 5.
- the shaft M3 of the drum 5, which forms the center of rotation, is perpendicular to the bottom surface of the tub body.
- the washing unit 91 is a means for discharging the water that has moved to the tub cover 43 by centrifugal force toward the door 45 to wash the door 45.
- the washing unit 91 of FIG. 4 may include a blocking wall 911 protruding from the tub cover 43 toward the upper surface of the drum 5, a guide 915 extending from the edge of the tub cover 43 toward the blocking wall 911, and a discharge part 913 formed through the blocking wall for discharging the water moving along the guide 915 toward the door 45.
- the blocking wall 911 may be configured to surround the entirety of the introduction port 431 or to intermittently surround the introduction port 431.
- the expression "the blocking wall intermittently surrounds the introduction port” means that a plurality of blocking walls is arranged along the edge of the introduction port at intervals.
- FIG. 4(b) shows the case in which the blocking wall 911 is configured to surround the entirety of the introduction port 431.
- the blocking wall 911 may protrude from the edge of the introduction port 431 toward the drum 5.
- the discharge part 913 may be inclined at a predetermined angle so as to discharge water toward the door 45.
- the discharge part 913 may be inclined at a predetermined angle so as to discharge water toward the window 455.
- the guide 915 may include a first guide 915a for guiding water moving toward the edge of the tub cover 43 to the discharge part 913 when the drum 5 is rotated in the clockwise direction and a second guide 915b for guiding water moving toward the edge of the tub cover 43 to the discharge part 913 when the drum 5 is rotated in the counterclockwise direction.
- the guides 915a and 915b guide water to the discharge part 913.
- the first guide 915a may be configured to guide water to the first discharge part 913a
- the second guide 915b may be configured to guide water to the second discharge part 913b.
- the direction in which the water moves along the first guide 915a is opposite the direction in which the water moves along the second guide 915b. Consequently, the washing unit 91 may wash the door 45 irrespective of the rotational direction of the drum as long as the number of rotations of the drum 5 is equal to or greater than a predetermined reference number of rotations (e.g. the number of rotations at which the water in the tub body moves upward to the tub cover due to centrifugal force).
- a predetermined reference number of rotations e.g. the number of rotations at which the water in the tub body moves upward to the tub cover due to centrifugal force.
- the discharge parts 913a and 913b may be inclined at a predetermined angle such that the trajectory of the water discharged from the first discharge part 913a and the trajectory of the water discharged from the second discharge part 913b intersect. In this case, the washing range of the washing unit 91 may be increased.
- a plurality of washing units 91 may be arranged along the edge of the introduction port 431.
- the washing units 91 may be arranged so as to surround the introduction port 431. Furthermore, at least two of the washing units 91 may be opposite each other in order to increase the washing force of the washing units 91.
- the washing guide 456 may be provided at the edge of the window 455.
- the water in the tub moves from the bottom surface of the tub to the edge of the frame 451 by centrifugal force and, in addition, moves along the edge of the frame 451.
- some of the water moving along the edge of the frame 451 may be guided toward the center of the window 455 (W1 and W2). In the present invention, therefore, it is possible to prevent foreign matter from remaining on the window through the washing guide 456.
- the washing guide 456 may include a first washing guide 456a and a second washing guide 456b provided symmetrically thereto on the basis of a line of symmetry Q of the door 45 (see FIG. 5(b) ).
- either the washing unit 91 or the washing guide 456 may be included, or both the washing unit 91 and the washing guide 456 may be included.
- FIG. 6 shows an example of a spray unit 93 for spraying water introduced through the supply port 433 to the drum 5 to wash the inner circumferential surface of the drum or remove bubbles generated in the drum.
- the spray unit 93 sprays water in at least two different directions.
- the spray unit 93 of FIG. 6 may include an extension part 933 protruding from the tub cover 43 so as to surround the supply port 433, a body 931 fixed to the extension part 933 so as to be spaced apart from the supply port 433 by a predetermined distance, and at least two spray ports formed through the extension part 933 for discharging water from the extension part 933.
- FIG. 6 shows the case in which the spray unit 93 includes a first spray port 935, a second spray port 937, and a third spray port 939 by way of example.
- the spray ports 935, 937, and 939 may be spaced apart from one another by different distances.
- At least one of the spray ports 935, 937, and 939 may be configured to spray water toward the circumferential surface 55 of the drum in order to wash the circumferential surface of the drum, and at least one of the spray ports may be configured to spray water toward the bottom surface of the drum in order to remove bubbles generated in the drum.
- the body 931 may be provided with an inclined surface that is inclined upward toward the spray ports 935, 937, and 939.
- the inclined surface may include a first inclined surface 931 a that is inclined upward from the surface of the body 931 toward the first spray port 935, a second inclined surface 931b that is inclined upward from the surface of the body toward the second spray port 937, and a third inclined surface (not shown) that is inclined upward from the surface of the body 931 toward the third spray port 939.
- the sectional area of a water channel is gradually decreased from the center of the body 931 toward the spray ports 935, 937, and 939 due to the inclined surfaces 931a and 931b. In the present invention, therefore, the pressure of water discharged through the spray ports 935, 937, and 939 is increased, whereby the spray unit 93 may spray water a long distance.
- the spray unit 93 having the above structure may be spaced apart from the center of rotation of the drum 5 by a predetermined distance. If the spray unit 93 is located at the same position as the center of rotation of the drum, the spray unit 93 can spray water to the edge of the drum, but it is difficult for the spray unit 93 to spray water to the center of rotation of the drum, which is located under the spray unit 93.
- the body 931 may be provided with a through hole to supply water to the center of rotation of the drum. In this case, however, the pressure of the water discharged through the spray ports 935, 937, and 939 may be reduced.
- the spray unit 93 is provided so as not to be located on a straight line passing through the center of rotation of the drum, it is possible to supply water to the entire area of the drum without reducing the pressure of the water sprayed from the spray unit 93.
- FIG. 7A is a view showing the change in level of water in the tub when wash water is supplied to perform main washing.
- the space in the tub 4 is sealed. As previously described, however, the space in the tub 4 is not physically sealed, and a detailed description thereof will be omitted.
- the tub cover and the door may be temporarily or permanently deformed, with the result that an unnecessary gap may be formed between the tub cover and the door.
- the negative pressure instantaneously and abruptly generated in the tub may be applied to the door, which is configured to be locked and unlocked by the push/open button type locking unit, such that the door is moved toward the inside of the tub, whereby the locking unit may be unlocked.
- the door when the negative pressure generated in the tub is higher than the force applied by the user in order to open the door, the door may be pulled, with the result that the door may be opened.
- FIG. 7B is a view showing the change in level of water in the tub when intermittent water supply is performed before wash water is supplied to perform main washing.
- FIG. 8 is a flowchart showing a method of controlling the laundry treatment apparatus according to the present invention.
- FIG. 10 is a block diagram showing the construction of the laundry treatment apparatus according to the present invention.
- the method of controlling the laundry treatment apparatus may include a washing course selection step (S100) of selecting a heating course in which laundry is heated, a water supply step (S400) of supplying water to the tub 4, a heating step (S600) of heating the water stored in the tub 4, a negative pressure prevention step (S700) of performing intermittent water supply to supply water into the tub 4 for a first predetermined amount of time and to interrupt the supply of water for a second predetermined amount of time, a washing water supply step (S800) of supplying water to a washing level for washing after the negative pressure prevention step, and a main washing step (S900).
- a washing course selection step S100 of selecting a heating course in which laundry is heated
- a water supply step (S400) of supplying water to the tub 4 supplying water to the tub 4
- a heating step (S600) of heating the water stored in the tub 4 a negative pressure prevention step (S700) of performing intermittent water supply to supply water into the tub 4 for a first predetermined amount of time and to interrupt the supply
- the controller 101 When a user selects a washing course at the washing course selection step (S100), the controller 101 performs control such that a washing cycle is performed according to the selected washing course.
- the washing cycle is a cycle of supplying water containing detergent into the tub and rotating the drum to wash laundry using frictional force generated on the inner circumferential surface of the drum and bending force caused by a stream of water generated in the tub.
- the heating course is a course in which water is supplied into the tub 4 to a predetermined level before the washing cycle of washing the laundry and in which the wash water is heated to a predetermined temperature using the heater 411 provided in the tub 4 to remove microorganisms from the laundry and soak the laundry.
- the wash water may be heated to about 90 °C or higher.
- the reason for this is that, when water is heated to about 90 °C or higher, germs or microorganisms present in laundry can be effectively killed.
- the heating course may be a boiling course in which wash water is boiled.
- the temperature of the wash water heated by the heater may be 100 °C.
- the amount of water that is supplied is set depending on the weight of laundry sensed at a laundry weight sensing step (not shown) performed before the heating course or the water supply step (S400).
- the water supply step (S400) may include a temperature sensing step (not shown) of sensing the temperature of water supplied into the tub 4.
- the temperature of water supplied into the tub 4 may be sensed using a temperature sensor 106 provided in the tub 4.
- the temperature of water supplied into the tub 4 may be measured using a temperature sensor 106 provided in the first or second water supply pipe.
- intermittent water supply may be repeated N1 times (S500 and S710).
- intermittent water supply is repeated N1 times, water is supplied to a washing level for washing without performing the negative pressure prevention step (S700), and then the main washing step is performed.
- the negative pressure prevention step (S700) is performed.
- the predetermined temperature may be about 10 °C, which is the temperature of the water supplied from an external water supply source.
- N1 times may be 30 times.
- the method of controlling the laundry treatment apparatus according to the present invention may include an initial level sensing step (S200) of sensing the initial level of water in the tub before the water supply step (S400).
- the initial level sensing step (S200) is performed after the washing course selection step. At the initial level sensing step (S200), whether water is present in the tub 4 is determined before water is supplied into the tub 4.
- the water supply step (S400) may be performed.
- intermittent water supply may be repeated N2 times (S500 and S710).
- the predetermined level may be a level at which the level of water stored in the tub is sufficient to be heated. Upon determining that the level of water in the tub is higher than the predetermined level, therefore, the heating step (S600), the washing water supply step (S800), and the main washing step (S900) may be performed without performing the water supply step (S400).
- a drainage step (not show) of draining water to reduce the level of water in the tub 4 to a level for heating may be performed, followed by the heating step (S600), the washing water supply step (S800), and the main washing step (S900). Consequently, it is possible to make uniform the time for which the heating step is performed through the drainage step of draining water to reduce the level of water in the tub to the level for heating, thereby saving energy.
- the washing water supply step (S800) and the main washing step (S900) are performed without performing the negative pressure prevention step (S700).
- That the sensed initial level of water is higher than the predetermined level means that water has already been stored in the tub 4.
- intermittent water supply is performed several times to reduce the temperature of the heated water in the tub 4, thereby preventing negative pressure from being instantaneously generated due to a large amount of water being supplied at once.
- N2 times may be 30 times.
- the laundry treatment apparatus may include a water level sensor 102 for transmitting electromagnetic waves (including ultrasonic waves) to water and receiving the electromagnetic waves reflected by the water.
- electromagnetic waves including ultrasonic waves
- the water level sensor 102 is provided at the upper side of the tub 4 to measure the level of water stored in the tub 4.
- a water level frequency measured by the water level sensor is in inverse proportion to the level of water in the tub. That is, when the water level frequency is high, the level of water in the tub may be low, and when the water level frequency is low, the level of water in the tub may be high.
- the water level sensor 102 may measure the level of water in a water level pipe 102a that is vertically provided so as to be parallel to the tub 4.
- the water level pipe 102a is connected to the lower side of the tub 4. Under atmospheric pressure, the level of water in the tub 4 is equal to the level of water in the water level pipe 102a.
- the heater 411 installed at the bottom surface of the tub 4 is driven to heat the water stored in the tub 4.
- water is supplied to a first level, which is lower than a washing level for main washing. The reason for this is that a large amount of time is required to heat a large amount of water. Consequently, water is supplied into the tub 4 only to a first level at which laundry is sufficiently immersed in the water.
- washing water supply step (S800) is performed to directly supply water to the washing level after the heating step (S600)
- water is introduced into the tub 4 to the washing level, which is higher than the first level, within a short time.
- the temperature of the water stored in the tub 4 is abruptly lowered, and the heated air in the tub 4 is abruptly condensed (i.e. contracted) due to the low-temperature water.
- FIG. 9 is a flowchart showing a control method for preventing negative pressure from being generated in the tub.
- the negative pressure prevention step (S700) will be described.
- intermittent water supply is performed to supply water into the tub 4 for a first predetermined amount of time and to interrupt the supply of water for a second predetermined amount of time.
- the first predetermined amount of time may be shorter than the second predetermined amount of time.
- the second predetermined amount of time may be longer than the first predetermined amount of time.
- the first predetermined amount of time may be about 0.1 seconds
- the second predetermined amount of time may be about 2 seconds. Consequently, a small amount of water is supplied, and then waiting is performed for a relatively long time such that the heated water in the tub 4 sufficiently exchanges heat with the supplied water to achieve thermal equilibrium.
- the water supply time is shortened to supply a small amount of water into the tub such that the temperature of the heated water is not abruptly changed and such that negative pressure is not abruptly generated in the tub.
- the waiting time for which water is not supplied is long such that the water in the tub 4 sufficiently exchanges heat with the supplied water to achieve thermal equilibrium.
- the controller 101 performs control such that the water supply valve 77 is open for the first predetermined amount of time in order to supply water into the tub 4 through the spray unit 93 and such that the water supply valve 77 is closed for the second predetermined amount of time to obtain the waiting time.
- the controller 101 performs control such that the water supply valve 77 is open for the first predetermined amount of time and is closed for the second predetermined amount of time, which is repeated twice.
- the negative pressure prevention step (S700) includes a comparative level sensing step (S720) of performing intermittent water supply N3 times and sensing a comparative level of water and a water level comparison step (S730) of comparing the sensed initial level of water with the sensed comparative level of water.
- the negative pressure prevention step (S700) may include an additional water supply step (S740) of further performing intermittent water supply N4 times based on the comparison result.
- the comparative level of water in the tub 4 is sensed within the second predetermined amount of time included in each time period for intermittent water supply.
- the comparative level of water in the tub 4 is sensed after the second predetermined amount of time included in each time period for intermittent water supply.
- the reason that the comparative level of water is measured after intermittent water supply at the comparative level sensing step (S720) is that negative pressure is generated in the tub due to the contraction of air caused by the abrupt change of temperature in the tub 4 only when the intermittent water supply is performed.
- N3 times may be 4 to 10 times, preferably 5 times.
- the reason that intermittent water supply is performed N3 times at the comparative level sensing step (S720) is that, when the comparative level of water is sensed after 1 to 3 times of intermittent water supply, the sensed comparative level of water may not reflect the level of water in the tub when a small amount of water is actually supplied into the tub. Consequently, the intermittent water supply is performed at least 5 times to set the comparative level of water to be used at the water level comparison step (S730).
- the highest one of the comparative levels of water sensed N3 times is selected as the comparative level of water sensed at the water level comparison step (S730).
- the level of water in the tub is indirectly measured (i.e. in the case in which the water level frequency of the water level pipe communicating with the sealed tub is measured)
- the level of water in the tub at which the highest one of the water level frequencies sensed during N3 times of intermittent water supply is sensed is selected as the sensed comparative level of water. The reason for this is that, when the water level frequency is highest, the level of water in the tub is highest.
- the sensed comparative level of water is compared with the sensed initial level of water.
- N4 is not fixed but varies depending on the difference.
- N4 may be preset and stored in the form of a table.
- the negative pressure prevention step (S700) is performed again from the beginning. That is, in the case in which the laundry treatment apparatus is temporarily stopped or completely stopped during intermittent water supply, the comparative level sensing step (S720), the water level comparison step (S730), and the additional water supply step (S740) are sequentially performed.
- negative pressure may be instantaneously generated in the tub during the washing water supply.
- the generated negative pressure is not sufficiently high to deform the tub cover or the door or to unlock the push/open button type locking unit of the door. As a result, the door is not opened.
- the laundry treatment apparatus may include an air channel unit for allowing the inside and the outside of the tub to communicate with each other.
- air may flow through the air channel unit, whereby it is possible to prevent instantaneous and abrupt difference in pressure between the inside and the outside of the tub 4.
- FIG. 11 is a view showing the state in which the door of the laundry treatment apparatus according to the present invention is open.
- FIG. 12 is a partial sectional view showing the laundry treatment apparatus according to the present invention.
- FIG. 13 is a view showing a tub air channel unit of the laundry treatment apparatus according to the present invention.
- the tub air channel unit of the laundry treatment apparatus according to the present invention will be described with reference to FIGs. 11 to 13 .
- the laundry treatment apparatus may include a tub 4, including a tub body 41 for storing water, a tub cover 43 defining the upper surface of the tub body 41, an introduction port 431 formed through the tub cover 43 for allowing laundry to be introduced therethrough, and a support port 433 provided in the tub cover 43 for supplying water to the tub body 41, a drum 5 rotatably provided in the tub, the drum 5 having an open surface communicating with the introduction port 431, a door 45 for opening and closing the introduction port 431, and a tub air channel unit 47 provided in the tub cover 43 for allowing the inside and the outside of the tub 4 to communicate with each other.
- a tub 4 including a tub body 41 for storing water, a tub cover 43 defining the upper surface of the tub body 41, an introduction port 431 formed through the tub cover 43 for allowing laundry to be introduced therethrough, and a support port 433 provided in the tub cover 43 for supplying water to the tub body 41, a drum 5 rotatably provided in the tub, the drum 5 having an open surface communicating with the introduction
- the tub body 41 is configured as a cylindrical shape that is open at the upper side thereof, and has a predetermined height. Wash water is stored in the tub body 41.
- the tub cover 43 covers the upper side of the tub body 41 to define space for storing wash water in the tub 4. Consequently, the inside and the outside of the tub 4 to communicate with each other only through the introduction port 431, which is provided in the tub cover 43.
- the introduction port 431 is a means for introducing laundry into the tub body 41 or removing the laundry from the tub body 41.
- the introduction port 431 is opened and closed by the door 45.
- the introduction port 431 may be configured as a polygonal shape, a circular shape, an oval shape, or a half-moon shape. In the present invention, the introduction port 431 may be configured as a half-moon shape. The reason for this is that, even when the drawer 3 is completely withdrawn from the cabinet 2, as shown in FIG. 1 , the upper surface of the tub 4 is not entirely visible. In the case in which the introduction port 431 is provided only in the portion of the upper surface of the tub 4 that is withdrawn from the cabinet 2, the introduction port 431 may be configured as a half-moon shape. In this case, the half-moon shape introduction port 431 includes a straight part 431a and a curved part 431b connected to the straight part 431a.
- the introduction port 431 is provided at the front side of the tub cover 43 (i.e. in the positive x-axis direction). The reason for this is that, when the drawer 3 is withdrawn, the introduction port 431 is visible such that laundry can be introduced into or removed from the drum 5.
- the sectional area of the introduction port 431 may be greater than half the sectional area of the upper surface of the tub cover 43. Meanwhile, the central axis of the tub 4 or the drum 5 may be located in the introduction port 431 such that the laundry received in the drum 5 is easily visible.
- the supply port 433 is provided in the portion of the tub cover 43 at which the introduction port 431 is not provided. That is, the supply port 433 is provided in the upper surface of the tub cover 43 at the rear side of the introduction port 431.
- the supply port 433 is provided in the tub cover 43 so as to be spaced apart from the straight part 431a of the introduction port 431. Even when the drawer 3 is completely withdrawn from the cabinet 2, the supply port 433 is not exposed through the open surface 21 of the cabinet 2, with the result that the supply port 433 is not visible.
- the tub air channel unit 47 is configured to allow the inside and the outside of the tub 4 to communicate with each other.
- negative pressure is generated in the tub 4
- air moves from the outside to the inside of the tub 4 through the tub air channel unit 47.
- positive pressure is generated in the tub 4
- air moves from the inside to the outside of the tub 4 through the tub air channel unit 47. Consequently, it is possible to prevent the door 45 from being opened or the tub 4 from being deformed due to instantaneous and abrupt difference in pressure between the inside and the outside of the tub 4.
- the tub air channel unit 47 may include an air hole 471 formed through the tub cover 43 such that air can directly flow between the inside and the outside of the tub through the air hole 471.
- the tub air channel unit 47 is provided between the introduction port 431 and the supply port 433.
- the tub air channel unit 47 may be provided in the central part of the tub cover 43.
- the water stored in the tub 4 moves upward due to the rotation of the drum 4.
- the upwardly moving water moves upward along the inner circumferential surface of the tub body 41 and reaches the edge of the tub cover 43. Some of the upwardly moving water reaches the center of the tub cover 43.
- the tub air channel unit 47 may be provided between the introduction port 431 and the supply port 433, i.e. in the central part of the tub cover 43.
- tub air channel unit 47 is provided in the upper surface of the tub cover, which is at the rear side of the introduction port 431. In this case, the tub air channel unit 47 is not exposed to the outside of the cabinet when the drawer is completely withdrawn from the cabinet, with the result that the tub air channel unit 47 is not visible.
- the air hole 471 formed through the tub cover 43 may include a first air hole 472 and a second air hole 473 having a larger sectional area than the first air hole 472. In other words, the diameter of the second air hole 473 is greater than that of the first air hole 472.
- the second air hole 473 is closer to an imaginary line C interconnecting the centers of the supply port 433 and the introduction port 431 than the first air hole 472.
- the second air hole 473 the diameter of which is relatively large
- the first air hole 473 the diameter of which is relatively small
- the air hole 471 may include a first group 4721 constituted by a plurality of first air holes 472 and a second group 4731 constituted by a plurality of second air holes 473. That is, the first group 4721 is a region in which a plurality of first air holes 472 is provided, and the second group 4731 is a region in which a plurality of second air holes 473 is provided.
- the second group 4731 is closer to the imaginary line interconnecting the centers of the supply port 433 and the introduction port 431 than the first group 4721, and the first group 4721 is farther from the imaginary line than the second group 4731.
- the second group 4731 is closer to the center of the tub 4 than the first group 4721, and the first group 4721 is further from the center of the tub 4 than the second group 4731. Consequently, it is possible to maximally prevent a stream of water moving upward in the tub 4 from being discharged out of the tub.
- the tub cover 43 may be provided in the upper surface thereof with a recess 474.
- the air hole 471 is provided in the bottom surface of the recess 474. Consequently, the water discharged out of the tub 4 through the air hole 471 is temporarily stored in the recess 474. When the rotation of the drum 5 is stopped, the water stored in the recess 474 flows into the tub 4 through the air hole 471.
- the tub cover 43 may be provided on the upper surface thereof with a partition wall 475, which protrudes to define a space part 474 that is open upward.
- the air hole 471 is provided in the bottom surface of the space part 474.
- the partition wall 475 is provided along a plurality of air holes 471 to form a closed loop. Consequently, the water discharged out of the tub 4 through the air holes 471 is temporarily stored in the space part, and then flows into the tub 4 through the air holes 471.
- each of the air holes 471 is provided with a net 476.
- the net 476 is formed by a plurality of lines that intersect, and has a plurality of gaps.
- the net 476 is provided to block a corresponding one of the air holes 471.
- the nets 476 maximally prevent wash water or bubbles from flowing through the air holes 471, and allow air to flow through the air holes 471.
- the nets 476 are provided in the first air holes 472 and the second air holes 473 to prevent wash water or bubbles from flowing through the first air holes 472 and the second air holes 473.
- the nets 476 may be made of stainless steel or plastic.
- a plurality of air holes 471 is formed is that, if a single air hole is formed so as to have the same area as a plurality of air holes, the air hole may be closed by water film. Water is cohesive, whereby water film is easily formed. Consequently, a single air hole and a single net may be blocked by water film formed by water and bubbles. As a result, air may not flow between the inside and the outside of the tub 4 due to negative pressure instantaneously and abruptly in the tub 4. In contrast, some of the air holes may be blocked by water film formed by water and bubbles; however, the other air holes are not blocked by the water film, whereby air may flow between the inside and the outside of the tub 4.
- the laundry treatment apparatus may further include a filter 477 provided in the recess 474 or the space part 474.
- the filter 477 absorbs water or bubbles flowing through the air hole 471 to prevent the water or bubbles from being discharged from the upper surface of the tub cover 43 to the outside.
- the laundry treatment apparatus may further include a door air channel unit 49 provided in the door 45 for allow the inside and the outside of the tub 4 to communicate with each other.
- FIG. 14 is a view showing a door air channel unit of the laundry treatment apparatus according to the embodiment of the present invention.
- FIG. 15 is a sectional view of the door air channel unit of the laundry treatment apparatus according to the embodiment of the present invention.
- the door air channel unit 49 will be described with reference to FIGs. 14 and 15 .
- the door air channel unit 49 is provided in the door 45, unlike the tub air channel unit 47, which is provided in the tub cover 43.
- the door 45 opens and closes the introduction port 431.
- the door 45 includes a frame 451 hingedly connected to the tub cover 43 and a window 455 provided at the frame 451.
- the window 455 is provided in the frame 451 so as to surround the window 455.
- the shape of the frame 451 may be configured to correspond to that of the introduction port 431 (see FIG. 1 ), or may be configured to cover the introduction port (see FIG. 14 ).
- the frame 451 includes a hinge socket 453a, into which a hinge shaft 435 provided on the upper surface of the tub cover 43 is inserted such that the frame 451 is hingedly connected to the tub cover 43.
- the hinge shaft 435 protrudes from the upper surface of the tub cover 43.
- the hinge socket 453a is provided inside thereof with a predetermined space, into which the hinge shaft 435 is inserted.
- the hinge socket 453a is formed at the rear end of the frame 451.
- Two hinge sockets 453a are provided at the rear end of the frame 451 so as to be spaced apart from each other.
- the window 455 may be made of a transparent material such that a user can check the interior of the tub body 41 when the drawer 3 is withdrawn from the cabinet 2.
- the window 455 is provided in a window mounting part formed through the frame 451.
- the shape of the window 455 may be configured to correspond to that of the introduction port 431. Alternatively, the area of the window 455 may be less than that of the introduction port 431.
- one of the frame 451 and the tub cover 43 may be provided with a sealing portion 459 for sealing the space between the frame 451 and the introduction port 431 when the door 45 closes the introduction port 431.
- the sealing portion 459 is made of rubber. When the door 45 is fastened to the introduction port 431 via the hook, the sealing portion 459 seals the gap between the door 45 and the tub cover 43 while pressing the lower surface of the door 45 and the upper surface of the tub cover 43.
- the shape of the sealing portion 459 may be configured to correspond to that of the introduction port 431.
- the sealing portion 459 may be mounted to a sealing portion fixing part 459a provided at the frame 451.
- the sealing portion fixing part 459a may be concavely provided in the lower surface of the frame 451 so as to have a predetermined depth.
- the sealing portion fixing part 459a may include two fixing part partition walls 475 protruding from the lower surface of the frame 451 to a predetermined height.
- the fixing part partition walls 475 are spaced apart from each other.
- Each of the fixing part partition walls 475 is formed so as to have a closed loop.
- the sealing portion 459 is mounted between the fixing part partition walls 475.
- the sealing portion fixing part 459a may be provided around the window 455.
- the shape of the sealing portion fixing part 459a may be configured to correspond to that of the introduction port 431.
- the sealing portion 459 includes an attachment and detachment protrusion 459b protruding toward the door 45 such that the sealing portion 459 is easily attached to and detached from the door 45.
- the door 45 includes a sealing portion insertion part 459c, into which the attachment and detachment protrusion 459b is inserted so as to be fixed to the door 45.
- the sealing portion insertion part 459c is provided inside the sealing portion fixing part 459a.
- the door air channel unit 49 may be formed through the door 45 or the frame 451 to allow the inside and the outside of the tub 4 to communicate with each other.
- the door air channel unit 49 may be located at the vicinity of the shaft of the frame 451. In other words, the door air channel unit 49 may be provided at the rear end of the frame 451 or between the frame 451 and the hinge socket 453a.
- the door air channel unit 49 may extend from the upper surface to the lower surface of the door 45 or the frame 451. If steam or hot water generated in the tub 4 is discharged through the upper surface of the door 45 or the frame 451, however, a safety-related accident may occur.
- the end of the door air channel unit 49 which allows the inside and the outside of the tub 4 to communicate with each other, may be provided in the lower surface of the door 45 or the frame 451.
- the door air channel unit 49 may include a hollow portion 495 provided in the door 45, a first air channel 491 for allowing the inside of the tub and the hollow portion 495 to communicate with each other, and a second air channel 493 for allowing the outside of the tub 4 and the hollow portion 495 to communicate with each other.
- the end of the first air channel 491 and the end of the second air channel 493 communicate with the lower side (i.e. the lower surface) of the door 45 such that steam or hot water discharged from the tub 4 is not directly transmitted to a user.
- the end of the first air channel 491 communicates with the inside of the tub 4. Consequently, the end of the first air channel 491 may be provided adjacent to the center of the tub 4 in order to maximally prevent water or bubbles from being introduced into the first air channel 491.
- the end of the second air channel 493 communicates with the outside of the tub 4. Consequently, the end of the second air channel 493 may be provided farther from the center of the tub 4 than the end of the first air channel 491.
- the end of the first air channel 491 is provided outside the sealing portion fixing part 459a, and the end of the second air channel 493 is provided inside the sealing portion fixing part 459a.
- the end of the first air channel 491 may be provided at the center of the door 45 or the frame 451 in the leftward-rightward direction (i.e. the Y-axis direction or the lateral direction), and the end of the second air channel 493 may be provided between the frame 451 and the hinge socket 453a.
- the hollow portion 495 which communicates with the first air channel 491 and the second air channel 493, is provided in the frame 451 in the leftward-rightward direction.
- the hollow portion 495 may be provided above the sealing portion fixing part 459a.
- the hollow portion 495 and the sealing portion fixing part 459a may communicate with each other through the sealing portion insertion part 459c.
- the attachment and detachment protrusion 459b of the sealing portion 459 may be inserted and fastened into the hollow portion 495 through the sealing portion insertion part 459c.
- the present invention has the effect of preventing instantaneous and abrupt difference in pressure between the inside and the outside of the tub 4 owing to the above structural features thereof.
- the present invention has the effect of preventing noise from being generated by air flowing through the gap between the door 45 and the tub cover 43 when the door 45 is opened or closed.
- the present invention has the effect of preventing the water level sensor 102 from incorrectly measuring the level of water, which may occur due to the instantaneous difference in pressure between the inside and the outside of the tub 4.
- the laundry treatment apparatus may be an auxiliary laundry treatment apparatus that is coupled to a main laundry treatment apparatus.
- a general washing apparatus may be referred to as a first washing apparatus
- a washing apparatus according to this embodiment may be referred to as a second washing apparatus.
- the first washing apparatus and the second washing apparatus may constitute a single laundry treatment apparatus.
- the first washing apparatus and the second washing apparatus may be separately manufactured so as to be capable of being coupled to each other.
- the second washing apparatus may be disposed on or under the first washing apparatus.
- a laundry treatment apparatus including a first washing apparatus and a second washing apparatus provided in a single cabinet
- the basic features of the second washing apparatus may be identical to those of the previous embodiment. That is, since the height and volume of the second washing apparatus are smaller than those of the first washing apparatus, the possibility of bubble generation is high, and it is critical to prevent the generation of bubbles.
- a laundry treatment apparatus includes a front loading type laundry treatment apparatus 200 and a top loading type laundry treatment apparatus 100 disposed on the front loading type laundry treatment apparatus.
- the top loading type laundry treatment apparatus 100 may be integrally coupled to the front loading type laundry treatment apparatus 200.
- the front loading type laundry treatment apparatus is a laundry treatment apparatus configured such that an opening is provided in the front of the laundry treatment apparatus and such that the shaft of a drum is parallel to the ground or inclined from the ground by a predetermined angle
- the top loading type laundry treatment apparatus is a laundry treatment apparatus configured such that an opening is provided in the top of the laundry treatment apparatus and such that the shaft of a drum is perpendicular to the ground.
- the front loading type laundry treatment apparatus 200 may be defined as a first laundry treatment apparatus, and the top loading type laundry treatment apparatus 100 may be defined as a second laundry treatment apparatus.
- the laundry treatment apparatus according to this embodiment may be configured such that the front loading type laundry treatment apparatus 200 and the top loading type laundry treatment apparatus 100 are separately provided, such that the front loading type laundry treatment apparatus 200 and the top loading type laundry treatment apparatus 100 are coupled to each other, or such that the front loading type laundry treatment apparatus 200 and the top loading type laundry treatment apparatus 100 are integrated.
- the laundry treatment apparatus may include a first cabinet 210 having a first opening 217 formed in the front thereof, a first laundry receiving unit 220 and 240 provided in the first cabinet 210 for receiving laundry, a second cabinet 110 provided on the first cabinet 210, the second cabinet 110 having a second opening 111 formed in the top thereof, and a second laundry receiving unit 120 and 140 provided in the second cabinet 110 for receiving laundry.
- the second laundry receiving unit 120 and 140 may be a drum, which may be rotatably provided in a tub 4.
- the first cabinet 210 may define the external appearance of the first laundry treatment apparatus 200
- the second cabinet 110 may define the external appearance of the second laundry treatment apparatus 100.
- first cabinet 210 and the second cabinet 110 may be coupled to each other to define the entire external appearance of the laundry treatment apparatus according to this embodiment.
- the first cabinet 210 may be provided at the front thereof with a first display unit 295 for displaying the state of the first laundry treatment apparatus 200, a first input unit 291 for allowing an operation command of the first laundry treatment apparatus 200 to be input, and a first controller 290 for controlling the operation of the first laundry treatment apparatus 200.
- the second cabinet 110 may be provided at the top thereof with a second display unit 195 for displaying the state of the second laundry treatment apparatus 100, a second input unit 191 for allowing an operation command of the second laundry treatment apparatus 100 to be input, and a second controller 190 for controlling the operation of the second laundry treatment apparatus 100.
- one selected from between the first controller 290 and the second controller 190 may control both the first laundry treatment apparatus and the second laundry treatment apparatus.
- operation commands may be input to both the first laundry treatment apparatus and the second laundry treatment apparatus through the first input unit 291, or operation commands may be input to both the first laundry treatment apparatus and the second laundry treatment apparatus through the second input unit 191.
- Each of the first display unit 295 and the second display unit 195 may include a panel, such as an LCD panel or an LED panel.
- each of the first display unit 295 and the second display unit 195 may include a speaker for outputting a sound to provide a user with information.
- the first display unit 295 and the second display unit 195 may display information about the laundry treatment apparatuses, and an alarm may be output to provide the user with information.
- the first laundry treatment apparatus 200 may be configured as a washing apparatus for washing laundry using detergent and water or as a drying apparatus for drying laundry using hot air.
- the first laundry receiving unit 220 and 240 may include a first tub 220 having a first introduction port 221 that communicates with the first opening 217 and providing space for storing water and a first drum 240 rotatably provided in the first tub 220 for receiving laundry.
- the first laundry receiving unit 220 and 240 may include a first drum 240 rotatably provided in the first cabinet 210 for receiving laundry.
- FIGs. 16 and 17 show the case in which the first laundry treatment apparatus 200 is configured as a washing apparatus. However, the case in which the first laundry treatment apparatus 200 is configured as a drying apparatus is not excluded.
- the second laundry treatment apparatus 100 may be configured as a washing apparatus for washing laundry using detergent and water or as a drying apparatus for drying laundry using hot air.
- the second laundry receiving unit 120 and 140 may include a second tub 120, having a second introduction port 121 that communicates with the second opening 111 and providing space for storing water, and a second drum 140, rotatably provided in the second tub 120 for receiving laundry.
- a water level sensor 127 for sensing the level of water in the second tub 120 may be provided at one side of the second tub 120, and a temperature sensor 128 for sensing the temperature of the second tub 120 may be provided at the inner circumferential surface of the second tub 120.
- the second laundry receiving unit 120 and 140 may include a second drum 140 rotatably provided in the second cabinet 110 for receiving laundry.
- FIGs. 16 and 17 show the case in which the second laundry treatment apparatus 100 is configured as a washing apparatus. However, the case in which the second laundry treatment apparatus 100 is configured as a drying apparatus is not excluded.
- the first laundry treatment apparatus 200 may include a first door 230 for opening and closing the first opening 210.
- the first door 230 may be called as a first cabinet door.
- the first door 230 may include a door gasket 231 for sealing the first introduction port 221 formed in the first tub 220 when the first opening 210 is closed.
- the first laundry treatment apparatus 200 may include a first water supply unit 260 for supplying water to the first tub 220 and a first drainage unit 270 for draining water from the first tub 220.
- the first water supply unit 260 may include a first water supply pipe 261 for supplying water from an external water supply source to the first tub 220, a detergent box 220 for mixing detergent with the water supplied to the first water supply pipe 261 and supplying the mixture to the first tub 220, and a first supply pipe 263 connecting the detergent box 220 to the first tub 220 for supplying the water and the detergent to the first tub 220.
- the first drainage unit 270 may include a first drainage pipe 272 provided under the first tub 220 for draining water from the first tub 220 and a first drainage pump 271 for draining water in the first drainage pipe 272 out of the first cabinet 210.
- the first laundry treatment apparatus 200 may include a supporting and damping unit 280 for supporting the first tub 220 in the first cabinet 210 and damping vibration generated from the first tub 220 such that the vibration is not transmitted to the first cabinet 210.
- the supporting and damping unit 280 may be configured as a damper, a spring, or a combination thereof. A plurality of supporting and damping units may be provided.
- a supporting and damping unit 280 may be provided at the upper part or the lower part of the first tub 220, or supporting and damping units 280 may be provided at the upper part and the lower part of the first tub 220.
- the first laundry treatment apparatus 200 may include a first driving unit 250 for rotating the first drum 230.
- the first driving unit 250 may include a first stator 251 provided at the rear surface of the first tub 220 for generating a rotating magnetic field, a first rotor 252 configured to be rotated by the rotating magnetic field generated by the first stator 251, and a shaft 253 having one end connected to the first rotor 252 and the other end extending through the first tub 220 so as to be connected to the first drum 240.
- the shaft 252 may be configured to be parallel to the ground or to be inclined upward from the ground.
- the first drum 240 may include a lifter 241 for lifting and dropping laundry when the first drum 240 is rotated to improve washing performance.
- the first drum 240 may be provided in the inner circumferential surface thereof with a plurality of through holes 242 through which water is introduced or discharged.
- the height of the second laundry treatment apparatus 100 is limited, since the second laundry treatment apparatus 100 is disposed on the first laundry treatment apparatus 200. That is, if the second laundry treatment apparatus 100 is higher, the washing capacity of the second laundry treatment apparatus 100 is further increased; however, it is difficult for a user to access the second opening 111.
- the second tub 120 is relatively low, with the result that water or laundry received in the second tub 120 may be discharged out of the second tub 120.
- the second tub 120 may include a tub door 130 for opening and closing the second introduction port 121.
- the tub door 120 closes the second introduction port 121 to prevent water or laundry received in the second tub 120 from being discharged out of the second tub 120.
- the tub door 130 may be hingedly provided at the top of the second tub 120.
- the tub door 130 may include a frame 131 hingedly coupled to the second tub via a door hinge 132, a window 133 provided in the frame, and a door handle 134 for separably coupling the frame 131 to the second tub 120.
- the window 133 may be made of a transparent material such that a user can check the interior of the second tub 120.
- a sealing part 135 for sealing the space between the frame 131 and the second introduction port 121 when the tub door 130 closes the second introduction port 121 may be provided at one selected from between the frame 131 and the inner circumferential surface of the second introduction port 121.
- the second laundry treatment apparatus 100 may include a second water supply unit 160 for supplying water to the second tub 120 and a second drainage unit 170 for draining water from the second tub 120.
- the second water supply unit 160 may include a second water supply pipe 161 for supplying water from an external water supply source to the second tub 120 and a water supply valve 162 for adjusting the flow rate in the second water supply pipe 161.
- the second drainage unit 170 may include a second drainage pipe 172 provided under the second tub 120 for draining water from the second tub 120 and a second drainage pump 171 communicating with the second drainage pipe 172 for draining water in the second drainage pipe 172 out of the second cabinet 110.
- the second water supply unit 160 and the second drainage unit 170 may be provided separately from the first water supply unit 260 and the first drainage unit 270, respectively.
- the second water supply unit 160 and the second drainage unit 170 may be integrally formed with the first water supply unit 260 and the first drainage unit 270, respectively, or may diverge from the first water supply unit 260 and the first drainage unit 270, respectively.
- the second laundry treatment apparatus 100 may be separably coupled to the first laundry treatment apparatus 200 or the second laundry treatment apparatus 100 and that the first laundry treatment apparatus 200 may be independently provided.
- the top of the second cabinet 110 may be defined by a cover door 116.
- the cover door 116 may be hingedly provided at one side of the second cabinet 110.
- the cover door 116 may be hingedly coupled to the second cabinet 110 via a cover hinge 117.
- the cover hinge 117 may be provided at one side of the cover door 116.
- the second drum 140 may include a drum introduction port 141 communicating with the second introduction port 111.
- the second drum 140 may be provided in the inner circumferential surface thereof with a plurality of through holes 142, through which water is introduced from or discharged to the second tub 120.
- the second laundry treatment apparatus 100 may include a second driving unit 150 for rotating the second drum 140 in the second tub 120.
- the second driving unit 150 may include a second stator 151 fixed to the lower surface of the second tub 120 for generating a rotating magnetic field, a second rotor 152 configured to be rotated by the rotating magnetic field generated by the second stator 151, and a shaft 153 having one end connected to the second rotor 152 and the other end extending through the second tub 120 so as to be connected to the second drum 140.
- the second laundry treatment apparatus 100 may include a heater 126 for heating the water stored in the second tub 120.
- the second laundry treatment apparatus 100 may include a temperature sensor 128 for measuring the temperature of the second tub 120 and a water level sensor 127 for sensing the level of water in the second tub 120.
- the second laundry treatment apparatus 100 may include a cover door 116 for opening and closing the second opening 111.
- the reason for this is that, if the second water supply unit 160, the second drainage unit 170, and the second driving unit 150, which are provided in the second cabinet 110 and the second tub 120, are exposed to the outside, the aesthetic appearance of the second laundry treatment apparatus is deteriorated and a safety-related accident may occur.
- the second laundry treatment apparatus 100 may include a support unit 180 for supporting the second tub 120 in the second cabinet 110.
- the support unit 180 may include a first support part 181 provided at the second cabinet 110, a second support part 182 provided at the second tub 120, and a connection part 183 for connecting the first support part 181 and the second support part 182 to each other.
- the first support part 181 is provided higher than the second support part 182.
- One end of the connection part 183 is coupled and fixed to the first support part 181, and the other end of the connection part 183 supports the second support part 182 such that the second tub 120 is fixed in the second cabinet 110.
- the first support part 181 may be configured as a first bracket protruding from the second cabinet 110.
- the second support part 182 may be configured as a second bracket protruding from the second tub 120.
- the connection part 183 may connect the first bracket and the second bracket to each other.
- the connection part 183 may be configured to be perpendicular to the ground.
- the volume of the support unit 180, including the connection part 183, may be minimized, whereby the washing capacity of the second tub 120 may be further increased.
- connection part 183 may include a first connection part 183a extending through the first support part 281 so as to be located in the first support part 281, a second connection part 183b extending through the second support part 182 so as to support the second support part 182, and a connection bar 183c for connecting the first connection part 183a and the second connection part 183b to each other.
- the diameter of the first connection part 183a and the second connection part 183b may be greater than that of the connection part 183c.
- the first connection part 183a and the second connection part 183b may be formed in the shape of a disc, a hemisphere, or a sphere. Consequently, the connection part 183 may be stably coupled to the first support part 181 and to the second support part 182.
- a laundry treatment apparatus that is capable of preventing abrupt negative pressure from being generated in a tub irrespective of the temperature of water supplied from the outside and a method of controlling the same.
- a laundry treatment apparatus that is capable of preventing a door from being deformed or opened by negative pressure in a tub and a method of controlling the same.
- a laundry treatment apparatus that is capable of preventing instantaneously high negative pressure from being generated in a tub and a method of controlling the same.
- a laundry treatment apparatus that is capable of preventing instantaneously abrupt negative pressure from being generated in a tub due to the amount of air being greater than the amount of air flowing per unit time between the inside and the outside of the tub and a method of controlling the same.
- the structure of a tub that is capable of allowing air to be introduced thereinto and to be discharged therefrom and of maximally preventing the introduction and discharge of wash water and bubbles and a laundry treatment apparatus including the same.
- a laundry treatment apparatus configured such that an air channel is formed in a tub cover located at the uppermost side of space, and the tub cover is coupled to a tub, whereby the manufacture of the laundry treatment apparatus is easy and the structure of the laundry treatment apparatus is simple.
Abstract
Description
- This application claims the benefit of Korean Patent Application No.
10-2016-0066753, filed on May 30, 2016 10-2016-0172983, filed on December 16, 2016 US Provisional Patent Application No. 62/423,201, filed on November 17, 2016 - The present application relates to a laundry treatment apparatus and a method of controlling the same.
- Generally, a laundry treatment apparatus is a concept including an apparatus that is capable of washing laundry (objects to be washed), an apparatus that is capable of drying laundry (objects to be dried), and an apparatus that is capable of washing and drying laundry.
- Conventional laundry treatment apparatuses are classified into a front loading type laundry treatment apparatus, into which laundry is introduced through an introduction port provided in the front thereof, and a top loading type laundry treatment apparatus, into which laundry is introduced through an introduction port provided in the top thereof.
- The top loading type laundry treatment apparatus includes a tub having an introduction port provided in the top thereof, a drum rotatably provided in the tub, and a door for opening and closing the introduction port.
- In general, a single large-capacity laundry treatment apparatus is used in each home. When laundry is to be sorted into respective kinds for washing, therefore, the laundry treatment apparatus must be used several times. For example, when laundry, such as adult clothes, and laundry, such as underwear or baby clothes, are to be separately washed, the laundry treatment apparatus is used to wash the former kind of laundry, and then the laundry treatment apparatus is used to wash the latter kind of laundry. As a result, washing time is increased, and power consumption is also increased.
- In addition, using a conventional large-sized laundry treatment apparatus to wash a small amount of laundry is not preferable in terms of energy savings. Since a washing course set in the large-sized laundry treatment apparatus is generally used to wash a large amount of laundry, water consumption is high. Furthermore, power consumption to rotate a large-sized drum or inner tub is also high. In addition, since the washing course is used to wash a large amount of laundry, the washing time is relatively long. Furthermore, since the washing course set in the large-sized laundry treatment apparatus is mainly used for general clothes, the large-sized laundry treatment apparatus may not be suitable for washing delicate clothes, such as underwear or baby clothes.
- The large-sized laundry treatment apparatus is also not suitable for frequently washing small amounts of laundry. Consumers tend to gather laundry for several days or more in order to wash laundry at once.
- If underwear or baby clothes remain unwashed for a long time, it is not sanitary. If such laundry remains unwashed for a long time, dirt may become more strongly adhered to the laundry, with the result that the laundry may not be thoroughly washed. For the above reasons, a small-sized laundry treatment apparatus having a smaller capacity than the large-sized laundry treatment apparatus is required.
- If two small-sized laundry treatment apparatuses are installed side by side in each home, however, it is not preferable in terms of space utilization or the external appearance thereof.
- In recent years, there has been proposed a combination-type laundry treatment apparatus including both a front loading type laundry treatment apparatus and a top loading type laundry treatment apparatus in order to solve the above problem.
- The top loading type laundry treatment apparatus is provided on or under the front loading type laundry treatment apparatus in order to wash a small amount of laundry, thereby improving space utilization.
- The height of the top loading type laundry treatment apparatus, which is an auxiliary laundry treatment apparatus, is limited. If the top loading type laundry treatment apparatus is high, the washing capacity of the apparatus is increased. In this case, however, it may be difficult for a user to access the top loading type laundry treatment apparatus, since the top loading type laundry treatment apparatus is provided on the front loading type laundry treatment apparatus. For this reason, it is preferable to configure the top loading type laundry treatment apparatus such that the top loading type laundry treatment apparatus is lower than conventional top loading type laundry treatment apparatuses.
- The laundry treatment apparatus, particularly the top loading type laundry treatment apparatus, which has a relatively small capacity, is characterized in that the distance between the introduction port and the upper end of the drum is very small.
- Consequently, washing must be performed in the state in which the laundry treatment apparatus is substantially sealed in order to prevent wash water or bubbles from being discharged to the outside.
- In such a small-sized laundry treatment apparatus, however, it is not preferable to completely seal the space for treating laundry. The reasons for this is that wash water is introduced into the space and is discharged from the space and that the pressure in the space may be abruptly changed as a result of change in temperature, resulting in the damage to components in the space.
- Consequently, it is difficult to manufacture a small-sized laundry treatment apparatus.
- Accordingly, the present invention is directed to a laundry treatment apparatus and a method of controlling the same that substantially obviate one or more in problems due to limitations and disadvantages of the related art.
- One object of the present invention is to provide a laundry treatment apparatus that is capable of preventing abrupt negative pressure from being generated in a tub and a method of controlling the same.
- Another object of the present invention is to provide a laundry treatment apparatus that is capable of preventing abrupt negative pressure from being generated in a tub irrespective of the temperature of water supplied from the outside and a method of controlling the same.
- Another object of the present invention is to provide a laundry treatment apparatus that is capable of preventing a door from being deformed or opened by negative pressure in a tub and a method of controlling the same.
- Another object of the present invention is to provide a laundry treatment apparatus that is capable of preventing instantaneously high negative pressure from being generated in a tub and a method of controlling the same.
- Another object of the present invention is to provide a laundry treatment apparatus that is capable of preventing instantaneously abrupt negative pressure from being generated in a tub due to the amount of air being greater than the amount of air flowing per unit time between the inside and the outside of the tub and a method of controlling the same.
- Another object of the present invention is to provide the structure of a tub that is capable of allowing air to be introduced thereinto and to be discharged therefrom and of maximally preventing the introduction and discharge of wash water and bubbles and a laundry treatment apparatus including the same.
- A further object of the present invention is to provide a laundry treatment apparatus configured such that an air channel is formed in a tub cover located at the uppermost side of space, and the tub cover is coupled to a tub, whereby the manufacture of the laundry treatment apparatus is easy and the structure of the laundry treatment apparatus is simple.
- Additional advantages, objects, and features will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice. The objectives and other advantages may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
- The objects are achieved with the features of the independent claims. Embodiments of the invention are defined by the dependent claims. To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, in accordance with an aspect of the present invention, a method of controlling a laundry treatment apparatus, including a tub for storing wash water, an introduction port provided in the upper surface of the tub, and a door for opening and closing the introduction port, includes a washing course selection step of selecting a heating course in which laundry is heated, a water supply step of supplying water to the tub, a heating step of heating the water stored in the tub, a negative pressure prevention step of performing intermittent water supply to supply water into the tub for a first predetermined amount of time and to interrupt the supply of water for a second predetermined amount of time, a washing water supply step of supplying water to a washing level for washing after the negative pressure prevention step, and a main washing step.
- The second predetermined amount of time may be longer than the first predetermined amount of time.
- When the temperature of the water supplied at the water supply step is lower than a predetermined temperature, the intermittent water supply may be repeated N1 times at the negative pressure prevention step.
- The method may include an initial level sensing step of sensing the initial level of water in the tub before the water supply step.
- When the initial level of water sensed at the initial level sensing step is higher than a predetermined level, the intermittent water supply may be repeated N2 times at the negative pressure prevention step.
- The negative pressure prevention step may include a comparative level sensing step of performing intermittent water supply N3 times and sensing a comparative level of water and a water level comparison step of comparing the sensed initial level of water with the sensed comparative level of water.
- At the comparative level sensing step, the comparative level of water in the tub may be sensed within the second predetermined amount of time included in each time period for intermittent water supply.
- The highest one of the comparative levels of water sensed N3 times may be selected as the comparative level of water sensed at the water level comparison step.
- The method may include an additional water supply step of further performing intermittent water supply N4 times based on the result of comparison between the comparative level of water and the initial level of water at the water level comparison step.
- When the difference between the comparative level of water and the initial level of water is less than a predetermined value, water may be directly supplied to the washing level without additional intermittent water supply, and then main washing may be performed.
- When the difference between the comparative level of water and the initial level of water exceeds the predetermined value, the number of times of additional intermittent water supply may be increased.
- In accordance with another aspect of the present invention, a laundry treatment apparatus includes a cabinet having a first opening and a second opening, a first cabinet door and a second cabinet door provided at the cabinet for opening and closing the first opening and the second opening, respectively, a first washing apparatus provided in the cabinet for treating laundry introduced from the front after the first cabinet door is opened, and a second washing apparatus for treating laundry introduced from above after the second cabinet door is opened, wherein the second washing apparatus includes a tub provided so as to be accessible after the second opening is opened through the second cabinet door, the tub being configured to store water, the upper part of the tub being open, a tub cover located at the upper part of the tub for covering the upper part of the tub, a drum provided in the tub so as to be rotatable about a vertical shaft, and an air channel unit formed in the tub cover for allowing air to communicate between the inside and the outside of the tub therethrough, and wherein the tub cover is coupled to the tub so as to allow air to communicate between the inside and the outside of the tub through the air channel unit.
- The tub cover may be configured to allow air to communicate between the inside and the outside of the tub only through the air channel unit.
- The tub cover may include a tub cover body coupled to the tub, the tub cover body being provided with an introduction port, through which laundry is introduced, and a tub door provided at the tub cover body for opening and closing the introduction port.
- The air channel unit may includes an air hole formed in the tub cover body.
- The tub cover body may be provided with a water supply port located at the rear of the introduction port for allowing water to be supplied into the tub from an external water supply source therethrough, and the air hole may be provided at the rear of the introduction port.
- The air hole may be provided between the introduction port and the water supply port.
- The air hole may include a first air hole and a second air hole having a larger sectional area than the first air hole.
- The tub cover body may be provided in the upper surface thereof with a recess that extends downward, and the air hole may include a plurality of air holes formed in the bottom surface of the recess.
- Each of the air holes may be provided with a mesh.
- The laundry treatment apparatus may further include a filter mounted to the recess. The filter may allow air to pass therethrough, and may prevent water or bubbles from passing therethrough. The filter may be configured to absorb water and bubbles introduced through the air holes.
- The air channel unit may be provided at the tub door.
- The air channel unit may include a hollow portion provided in the tub door, a first air channel for allowing the inside of the tub and the hollow portion to communicate with each other, and a second air channel for allowing the outside of the tub and the hollow portion to communicate with each other.
- The tub door may be provided at the lower surface thereof with a sealing portion fixing part to which a sealing portion for sealing the introduction port is fixed, and the hollow portion may be formed above the sealing portion fixing part.
- The sealing portion may form a closed loop, and the air channel unit may extend from the inside to the outside of the closed loop.
- The tub door may include a frame rotatably connected to the tub cover body and a transparent window provided at the frame. The air channel unit may be formed in the frame. A sealing portion may be provided at an inner surface of the tub door to seal the introduction port.
- The frame may comprise a washing guide to guide water that moves when the drum is rotated toward a center of the transparent window along an inner surface of the transparent window. The frame may be configured to surround the window, and the tub door may further include a washing guide provided between the inner edge of the frame and the outer edge of the window for guiding water that moves when the drum is rotated toward the center of the window along the inner surface of the window.
- The air channel unit may include an air hole formed in the tub cover body. Consequently, the air channel units may be formed at both the tub cover body and the tub door.
- The air hole may include a plurality of first air holes and a plurality of second air holes having a larger sectional area than the first air holes. The reason for this is that, if the air holes have the same area, the air holes may be simultaneously closed by water film. Consequently, air discharge pressure or speed may be changed to form the optimum air passage structure.
- The tub cover body may be provided in the upper surface thereof with a recess that extends downward, and the air hole may include a plurality of air holes formed in a bottom surface of the recess. A member having a channel resistance for allowing air to be discharged but preventing water and bubbles from being discharged may be mounted above the recess. The member having the channel resistance may be a sponge type filter or a labyrinth member.
- The laundry treatment apparatus may further include a filter mounted to the recess for allowing air introduced through the air holes to pass therethrough and absorbing water and bubbles introduced through the air holes.
- In accordance with a further aspect of the present invention, a laundry treatment apparatus, having a tub for storing water, the upper part of the tub being open, a tub cover located at the upper part of the tub for covering the upper part of the tub, and a drum provided in the tub so as to be rotatable about a vertical shaft, includes an air channel unit formed in the tub cover for allowing air to communicate between the inside and the outside of the tub therethrough, wherein the tub cover is coupled to the tub so as to allow air to communicate between the inside and the outside of the tub through the air channel unit.
- It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention as claimed.
- The accompanying drawings, which are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the present invention and together with the description serve to explain the principle of the present invention. In the drawings:
-
FIGs. 1 and2 are views showing an example of a laundry treatment apparatus according to an embodiment of the present invention; -
FIG. 3 is a view showing an example in which a drawer, a tub, and a drum are coupled to one another; -
FIG. 4 is a view showing an example of a washing unit included in the laundry treatment apparatus according to the embodiment of the present invention; -
FIG. 5 is a view showing an example of a washing guide included in the laundry treatment apparatus according to the embodiment of the present invention; -
FIG. 6 is a view showing an example of a spray unit included in the laundry treatment apparatus according to the embodiment of the present invention; -
FIG. 7A is a view showing the change in level of water in the tub when wash water is supplied for main washing in an embodiment of the present invention; -
FIG. 7B is a view showing the change in level of water in the tub when intermittent water supply is performed before wash water is supplied for main washing in an embodiment of the present invention; -
FIG. 8 is a flowchart showing a method of controlling the laundry treatment apparatus according to the embodiment of the present invention; -
FIG. 9 is a flowchart showing a control method for preventing the generation of negative pressure in the tub of the laundry treatment apparatus according to the embodiment of the present invention; -
FIG. 10 is a block diagram showing the construction of the laundry treatment apparatus according to the embodiment of the present invention; -
FIG. 11 is a view showing the state in which a door of the laundry treatment apparatus according to the embodiment of the present invention is open; -
FIG. 12 is a partial sectional view showing the laundry treatment apparatus according to the embodiment of the present invention; -
FIG. 13 is a view showing a tub air channel unit of the laundry treatment apparatus according to the embodiment of the present invention; -
FIG. 14 is a view showing a door air channel unit of the laundry treatment apparatus according to the embodiment of the present invention; -
FIG. 15 is a sectional view of the door air channel unit of the laundry treatment apparatus according to the embodiment of the present invention, whereinFIG. 15A is a sectional view taken along line I1-I1' andFIG. 15B is a sectional view taken along line I2-I2'; -
FIG. 16 is a view showing an example of a laundry treatment apparatus according to another embodiment of the present invention; and -
FIG. 17 is a sectional view of the laundry treatment apparatus shown inFIG. 16 . - Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Meanwhile, the configuration of an apparatus or a control method of the apparatus, which will be described below, is merely given to describe the embodiments of the present invention, without being intended to limit the scope of the present invention. The same reference numerals used throughout the specification refer to the same constituent elements.
- As shown in
FIGs. 1 and2 , an example of a laundry treatment apparatus according to an embodiment of the present invention is a small-sized top loader. That is, the present invention relates to a small-sized washer and, more particularly, to a laundry treatment apparatus that can be used together with a general washer or dryer. - The laundry treatment apparatus according to the present invention may be located on a washer or a dryer, or may be located under the washer or the dryer. Of course, the laundry treatment apparatus according to the present invention may be provided together with a general washer or dryer in a single cabinet. Consequently, the volume or height of the laundry treatment apparatus according to the present invention may be smaller than that of the washer or the dryer.
- Specifically, a
laundry treatment apparatus 100 according to an embodiment of the present invention may include acabinet 2, adrawer 3 configured to be withdrawn from the cabinet, atub 3 provided in the drawer for storing water, and adrum 5 rotatably provided in the tub for receiving laundry. - The
cabinet 2 may be configured to define the external appearance of the laundry treatment apparatus. Alternatively, thecabinet 2 may be simply configured as space for receiving thedrawer 3. In any case, thecabinet 2 may be provided at the front surface thereof with anopen surface 21, through which thedrawer 2 is inserted. - The
drawer 3 includes adrawer body 31 configured to be inserted into thecabinet 2 through theopen surface 21, adrawer panel 33 fixed to the front surface of thedrawer body 31 for opening and closing the openingsurface 21, and adrawer cover 35 configured to define the upper surface of thedrawer body 31. - The
drawer panel 33 may also serve as a handle for withdrawing thedrawer body 31 from thecabinet 2, since thedrawer panel 33 is fixed to the front surface of thedrawer body 31. - The
drawer panel 33 may be provided with acontrol panel 331 for allowing a user to input a control command related to the operation of thelaundry treatment apparatus 100 and for displaying a message related to the operation of the laundry treatment apparatus to the user. - The
drawer body 31 may be inserted into thecabinet 2 through theopen surface 21. The shape of thedrawer body 31 is not particularly restricted, as long as thedrawer body 31 provides space for receiving thetub 4.FIG. 1 shows adrawer body 31 formed in an empty hexahedral shape by way of example. - The
drawer cover 35 is provided with a first throughhole 351 and a second throughhole 353, through which the inside and outside of thedrawer body 31 communicate with each other. The first throughhole 351 is provided to introduce laundry, and the second throughhole 353 is provided to supply water necessary to wash the laundry, which will be described in detail later. - As shown in
FIG. 2 , thetub 4 includes atub body 41 located in thedrawer body 31 for storing water and atub cover 43 configured to define the upper surface of thetub body 41. Thetub 4 may include atub opening 44a that defines an opened upper surface of thetub body 41. Thus, thetub cover 43 may cover thetub opening 44a. - The
tub body 41 may be configured as a cylindrical shape that is open at the upper surface thereof. Aheater 411 for heating water may be provided in thetub body 41. - The diameter of the
tub body 41 is greater than the height of thetub body 41. In other words, the vertical length of thetub body 41 is greater than the horizontal length of thetub body 41. - The
tub cover 43 may include a tub cover body. Thecover body 44 may be coupled to thetub 4. Thetub cover 43 may include anintroduction port 431, through which the inside and outside of thetub body 41 communicate with each other, and asupply port 433, through which water is supplied into thetub body 41. - The
tub cover 43 covers the open upper surface of thetub body 41 such that the inside and outside of the tub communicate with each other through theintroduction port 431. - The
introduction port 431 may be provided under the first throughhole 351 provided in the drawer cover, and thesupply port 433 may be provided under the second throughhole 353 provided in the drawer cover. - The
introduction port 431 is a means for supplying laundry into thetub body 41 or withdrawing the laundry from thetub body 41. Theintroduction port 431 is opened and closed by adoor 45. - As shown in
FIGs. 3 and4 , thedoor 45 may include aframe 451 rotatably coupled to thetub cover 43 via ahinge 453, awindow 455 provided in the frame, and adoor handle 457 for separably coupling theframe 451 to thetub cover 43. Thustub cover 43 may include atub cover body 44. Thetub cover body 44 may be coupled to thetub body 41. - The
window 455 may be made of a transparent material such that the user can check the interior of thetub body 41 when thedrawer 3 is withdrawn from thecabinet 2. - One end of the
door 45 is connected to the upper surface of thetub cover 43 such that thedoor 45 is turned to open and close theintroduction port 431. When thedoor 45 closes theintroduction port 43, thetub 4 is sealed. - The space in the
tub 4 is not completely physically sealed such that air cannot flow between the inside and the outside of thetub 4. The reason for this is that air can flow between the inside and the outside of thetub 4 through a tub air channel unit or a door air channel unit, which will be described later. - In an embodiment of the present invention, the space in the
tub 4 may be described as being sealed in the case in which the amount of air that can flow through a communication part between the inside and the outside of thetub 4 per unit time is much less than the amount of air that must flow between the inside and the outside of thetub 4 per unit time in order to reduce the difference in pressure between the inside and the outside of thetub 4, which instantaneously and abruptly occurs. - In an embodiment of the present invention, therefore, the space in the
tub 4 may be instantaneously sealed. That is, when a difference in pressure between the inside and the outside of thetub 4 occurs due to abrupt compression or expansion of air in thetub 4 in the state in which thedoor 45 is closed, the amount of air per unit time that can flow between the inside and the outside of thetub 4 is much less than the amount of air per unit time that must flow between the inside and the outside of thetub 4 in order to reduce the difference in pressure between the inside and the outside of thetub 4. As a result, negative pressure or positive pressure may be instantaneously and abruptly generated in thetub 4. - A hook 450 provided at the other end of the
door 45 is fastened to a hook hanger 430 provided at thetub cover 43 such that thedoor 45 is fixed to thetub cover 43. The hook hanger 430 may protrude such that the end of the hook 450 is caught by the hook hanger 430. - Alternatively, referring to
FIG. 11 , thedoor 45 may be locked and unlocked by a push/open button type locking unit 432. That is, when the upper surface of thedoor 45 is pushed to close thedoor 45, thedoor 45 is locked, and when the upper surface of thedoor 45 is pushed again to open thedoor 45, thedoor 45 is unlocked. - The locking unit 432 includes a latching
protrusion 4322 protruding from the upper surface of thetub cover 43, the latchingprotrusion 4322 having afastening hole 4321, and an unlockingpart 4323 provided at the inner surface of thedoor 45. When a user applies force in the direction in which thelatching protrusion 4322 is inserted, the unlockingpart 4323 is inserted into thefastening hole 4321 to fix thelatching protrusion 4322. When the user applies force again in the direction in which thelatching protrusion 4322 is inserted, the unlockingpart 4323 is separated from thefastening hole 4321, whereby the coupling between the latchingprotrusion 4322 and the unlockingpart 4323 is released. Alternatively, the latchingprotrusion 4322 may be provided at thedoor 45, and the unlockingpart 4323 may be provided at thetub cover 43. - Meanwhile, the
door 45 or thetub cover 43 may be provided with anopening part 4324 for increasing the distance between thedoor 45 and thetub cover 43. Theopening part 4324 is provided at the inner surface of thedoor 45 to provide elastic force toward thetub cover 43. When the door is unlocked, therefore, the door is pushed from the tub cover. - The laundry treatment apparatus according to the present invention is different from a general top loading type washer in that, in the general top loading type washer, the upper surface of the tub is open and the interior of the tub communicates with the interior of the cabinet, whereas, in the laundry treatment apparatus according to the present invention, however, the upper surface of the tub is closed and the
introduction port 431 formed in the upper surface of thetub 4 is sealed by thedoor 45 rotatably provided at the upper surface of thetub cover 43, whereby the interior of thetub 4 does not communicate with the interior of the cabinet. That is, the interior of thetub 4 is sealed. - The reason that the upper surface of the tub is closed in the laundry treatment apparatus according to the present invention is that a large amount of bubbles may be generated in the
tub 4 due to the rotation of the drum and the generated bubbles may flow outward through the upper surface of the tub, since the height of thetub 4 is smaller than the diameter of thetub 4. In order to solve this problem, the upper surface of the tub is closed. - Meanwhile, in order to prevent the water in the
tub body 41 from being discharged out of thetub body 41 through theintroduction port 431, any one selected from between theframe 451 and thetub cover 43 may be further provided with a sealingpart 459 for sealing the gap between theframe 451 and theintroduction port 431 when thedoor 45 closes theintroduction port 431. - The
tub 4 having the above structure is coupled to thedrawer body 31 via atub support unit 6. Thetub support unit 6 may include afirst support part 61 provided at thedrawer body 31, asecond support part 63 provided at thetub body 41, and aconnection part 65 for connecting the first support part and the second support part to each other. - The
connection part 65 may include afirst connection part 651 located in thefirst support part 61, asecond connection part 653 for supporting thesecond support part 63, and abar 655 for connecting the first connection part and the second connection part to each other. - The
first connection part 651 may be formed in a shape in which thefirst connection part 651 is movable in thefirst support part 61 while being 651 located in thefirst support part 61, and thesecond connection part 653 may be formed in a shape in which thesecond connection part 653 is movable in thesecond support part 63 while supporting thesecond support part 63. -
FIG. 2 shows the case in which each of the first andsecond connection parts FIG. 3 shows the case in which the surface of each of theconnection parts support parts - Meanwhile, as shown in
FIG. 2 , thebar 655 may be configured to be perpendicular to the bottom surface of the cabinet 2 (i.e. configured to be parallel to the height direction Z of the cabinet and to be perpendicular to the bottom surface of the drawer). - In the embodiment of the present invention, at least three
tub support units 6 are provided to couple thetub body 41 to thedrawer body 31, and thebars 655 are perpendicular to the bottom surface of the cabinet. Consequently, it is possible to increase the distance between thetub cover 43 and thedrawer cover 35, compared to the case in which thebars 655 are inclined from the Z axis by a predetermined angle. - Consequently, the
tub support units 6 included in the embodiment of the present invention may minimize the possibility of thetub cover 43 colliding with thedrawer cover 35 even when thetub body 41 vibrates in thedrawer body 31. - Meanwhile, in the case in which the
bars 655 are perpendicular to the bottom surface of the drawer, at least one of the first andsecond support parts drawer body 31. - In the case in which at least three
tub support units 6 are provided and thefirst support part 61 and thesecond support part 63 are fixedly provided at thedrawer body 31, a worker who wishes to fix thetub 41 to thedrawer body 31 must insert thetub body 41 into thedrawer body 31 such that thesecond support part 63 does not interfere with thefirst support part 61 and then rotate thetub body 41 such that thesecond support part 63 is located on the vertical line passing through thefirst support part 61 in order to couple thefirst connection part 651 to thefirst support part 61. - In the case in which the
bars 655 of thetub support units 6 are perpendicular to the bottom surface of the drawer, however, the gap S between the outer circumferential surface of thetub body 41 and the inner circumferential surface of thedrawer body 41 may be minimized, thereby minimizing the volume of thelaundry treatment apparatus 100, but the efficiency in assembly of thefirst connection part 651 and thefirst support part 61 performed through the above procedure may be deteriorated. This problem may be solved in the case in which thefirst support part 61 is separably provided at thedrawer body 41. - The
drum 5, provided in thetub 4, may include acylindrical drum body 51 having anopen surface 53 provided in the upper part thereof. Theopen surface 53 is located under theintroduction port 431. Consequently, laundry supplied through theintroduction port 431 is introduced into thedrum body 51 through theopen surface 53. - Meanwhile, the
drum body 51 may be provided in thebottom surface 57 and thecircumferential surface 55 thereof with a plurality of drum throughholes 59, through which the inside of thedrum body 51 and thetub body 41 communicate with each other. - The
drum body 51 is rotated in thetub body 41 by a driving unit M (e.g. a motor). The driving unit M may include a stator M1 fixed to the bottom surface of the tub body while being located outside thetub body 41, a rotor M2 configured to be rotated by a rotating field provided by the stator, and a shaft M3 extending through the bottom surface of thetub body 41 for connecting thebottom surface 57 of the drum and the rotor M2 to each other. In this case, the shaft M3 may be perpendicular to the bottom surface of thetub body 41. - In the
laundry treatment apparatus 100 having the above structure, water is supplied to thetub 4 through awater supply unit 7, and the water stored in thetub 4 is discharged out of thecabinet 2 through adrainage unit 8. - As shown in
FIG. 2 , thewater supply unit 7 may include a firstwater supply pipe 71 connected to thesupply port 433, which is provided at the tub cover, a secondwater supply pipe 73 connected to a water supply source located outside the cabinet, and aconnection pipe 75 fixed to thetub cover 43 for connecting the first water supply pipe and the second water supply pipe to each other. - The first
water supply pipe 71 may connect thesupply port 433 and theconnection pipe 75 to each other through the second throughhole 353, which is provided in thedrawer cover 35, and may be configured as a bellows pipe so as to prevent the firstwater supply pipe 71 from being separated from theconnection pipe 75 when thetub 4 vibrates (seeFIG. 3 ). - In addition, the second
water supply pipe 73 may also be configured as a bellows pipe so as to prevent the second water supply pipe 72 from being separated from theconnection pipe 75 when the drawer is withdrawn from thecabinet 2. The secondwater supply pipe 73 is opened and closed by awater supply valve 77 under the control of acontroller 101. - Unlike what is shown in
FIG. 2 , however, thewater supply unit 7 may include a single water supply pipe for connecting a water supply source (not shown) located outside the cabinet and thesupply port 433, which is provided at the tub cover. In this case, the water supply pipe may be configured as a bellows pipe. - The
drainage unit 8 may include adrainage pump 81 fixed to thedrawer body 31, afirst drainage pipe 83 for guiding the water from thetub body 41 to thedrainage pump 81, and asecond drainage pipe 85 for guiding the water discharged from thedrainage pump 81 out of thecabinet 2. In this case, thesecond drainage pipe 85 may be configured as a bellows pipe. Thecontroller 101 controls the operation of thedrainage pump 81 such that water from thetub 4 is drained to the outside via thefirst drainage pipe 83, thedrainage pump 81, and thesecond drainage pipe 85. - In the
laundry treatment apparatus 100 having the above structure, laundry is introduced into thedrum 5, water and detergent are supplied into thetub 4, and thedrum 5 is rotated by the driving unit to wash the laundry. - During the rotation of the
drum 5, a stream of water is generated in thetub 4. Consequently, bubbles generated when the detergent is dissolved during washing of the laundry or dirt separated from the laundry may remain on thedoor 45 or thedrum 5 after the completion of washing. - If bubbles or dirt remain on the inner surface of the
door 45 or the circumferential surface of the drum after the completion of washing, the user may misjudge that washing of the laundry has not been completed or may suspect that thelaundry treatment apparatus 100 is out of order. - In order to solve the above problem, the
laundry treatment apparatus 100 according to the present invention may further include at least one selected from between awashing unit 91 for removing foreign matter (e.g. bubbles or dirt) from thedoor 45 and aspray unit 93 for preventing the generation of bubbles and washing the drum. - The
washing unit 91 shown inFIG. 4 is a means for washing thedoor 45 using centrifugal force generated during the rotation of thedrum 5. - The shaft M3 of the
drum 5, which forms the center of rotation, is perpendicular to the bottom surface of the tub body. When thedrum 5 is rotated, therefore, the water in thetub 4 moves upward along the circumferential surface of thetub body 41 by centrifugal force and then moves toward theintroduction port 431 along thetub cover 43. In this embodiment, thewashing unit 91 is a means for discharging the water that has moved to thetub cover 43 by centrifugal force toward thedoor 45 to wash thedoor 45. - The
washing unit 91 ofFIG. 4 may include a blockingwall 911 protruding from thetub cover 43 toward the upper surface of thedrum 5, aguide 915 extending from the edge of thetub cover 43 toward the blockingwall 911, and adischarge part 913 formed through the blocking wall for discharging the water moving along theguide 915 toward thedoor 45. - The blocking
wall 911 may be configured to surround the entirety of theintroduction port 431 or to intermittently surround theintroduction port 431. The expression "the blocking wall intermittently surrounds the introduction port" means that a plurality of blocking walls is arranged along the edge of the introduction port at intervals. -
FIG. 4(b) shows the case in which the blockingwall 911 is configured to surround the entirety of theintroduction port 431. In this case, the blockingwall 911 may protrude from the edge of theintroduction port 431 toward thedrum 5. - Meanwhile, in the case in which the
door 45 is rotatably coupled to the upper surface of thetub cover 43, with the result that the inner surface of the door 45 (i.e. the surface of the door that contacts water) is at a higher position than thedischarge part 913, thedischarge part 913 may be inclined at a predetermined angle so as to discharge water toward thedoor 45. - Furthermore, in the case in which the
door 45 is provided with atransparent window 455, the user may check whether foreign matter remains through thewindow 455. Consequently, thedischarge part 913 may be inclined at a predetermined angle so as to discharge water toward thewindow 455. - The
guide 915 may include afirst guide 915a for guiding water moving toward the edge of thetub cover 43 to thedischarge part 913 when thedrum 5 is rotated in the clockwise direction and asecond guide 915b for guiding water moving toward the edge of thetub cover 43 to thedischarge part 913 when thedrum 5 is rotated in the counterclockwise direction. - In the case in which the
discharge part 913 includes a single hole formed through the blockingwall 911, theguides discharge part 913. In the case in which thedischarge part 913 includes afirst discharge part 913a and asecond discharge part 913b formed through the blockingwall 911, however, thefirst guide 915a may be configured to guide water to thefirst discharge part 913a, and thesecond guide 915b may be configured to guide water to thesecond discharge part 913b. - The direction in which the water moves along the
first guide 915a is opposite the direction in which the water moves along thesecond guide 915b. Consequently, thewashing unit 91 may wash thedoor 45 irrespective of the rotational direction of the drum as long as the number of rotations of thedrum 5 is equal to or greater than a predetermined reference number of rotations (e.g. the number of rotations at which the water in the tub body moves upward to the tub cover due to centrifugal force). - In addition, the
discharge parts first discharge part 913a and the trajectory of the water discharged from thesecond discharge part 913b intersect. In this case, the washing range of thewashing unit 91 may be increased. - A plurality of
washing units 91 may be arranged along the edge of theintroduction port 431. Thewashing units 91 may be arranged so as to surround theintroduction port 431. Furthermore, at least two of thewashing units 91 may be opposite each other in order to increase the washing force of thewashing units 91. - Meanwhile, foreign matter remaining on the
door 45 may be removed using awashing guide 456 shown inFIG. 5 . Thewashing guide 456 may be provided at the edge of thewindow 455. During the rotation of the drum, the water in the tub moves from the bottom surface of the tub to the edge of theframe 451 by centrifugal force and, in addition, moves along the edge of theframe 451. In the case in which thewashing guide 456 is provided at the edge of thewindow 455, some of the water moving along the edge of theframe 451 may be guided toward the center of the window 455 (W1 and W2). In the present invention, therefore, it is possible to prevent foreign matter from remaining on the window through thewashing guide 456. - In order to maximize the washing area, however, the
washing guide 456 may include afirst washing guide 456a and asecond washing guide 456b provided symmetrically thereto on the basis of a line of symmetry Q of the door 45 (seeFIG. 5(b) ). - In the present invention, either the
washing unit 91 or thewashing guide 456 may be included, or both thewashing unit 91 and thewashing guide 456 may be included. -
FIG. 6 shows an example of aspray unit 93 for spraying water introduced through thesupply port 433 to thedrum 5 to wash the inner circumferential surface of the drum or remove bubbles generated in the drum. - In this embodiment, the
spray unit 93 sprays water in at least two different directions. Thespray unit 93 ofFIG. 6 may include anextension part 933 protruding from thetub cover 43 so as to surround thesupply port 433, abody 931 fixed to theextension part 933 so as to be spaced apart from thesupply port 433 by a predetermined distance, and at least two spray ports formed through theextension part 933 for discharging water from theextension part 933. -
FIG. 6 shows the case in which thespray unit 93 includes afirst spray port 935, asecond spray port 937, and athird spray port 939 by way of example. Thespray ports - Meanwhile, at least one of the
spray ports circumferential surface 55 of the drum in order to wash the circumferential surface of the drum, and at least one of the spray ports may be configured to spray water toward the bottom surface of the drum in order to remove bubbles generated in the drum. - In order to increase the pressure of the water discharged through the
spray ports body 931 may be provided with an inclined surface that is inclined upward toward thespray ports - The inclined surface may include a first
inclined surface 931 a that is inclined upward from the surface of thebody 931 toward thefirst spray port 935, a secondinclined surface 931b that is inclined upward from the surface of the body toward thesecond spray port 937, and a third inclined surface (not shown) that is inclined upward from the surface of thebody 931 toward thethird spray port 939. - The sectional area of a water channel is gradually decreased from the center of the
body 931 toward thespray ports inclined surfaces spray ports spray unit 93 may spray water a long distance. - Meanwhile, the
spray unit 93 having the above structure may be spaced apart from the center of rotation of thedrum 5 by a predetermined distance. If thespray unit 93 is located at the same position as the center of rotation of the drum, thespray unit 93 can spray water to the edge of the drum, but it is difficult for thespray unit 93 to spray water to the center of rotation of the drum, which is located under thespray unit 93. - The
body 931 may be provided with a through hole to supply water to the center of rotation of the drum. In this case, however, the pressure of the water discharged through thespray ports - In the case in which the
spray unit 93 is provided so as not to be located on a straight line passing through the center of rotation of the drum, it is possible to supply water to the entire area of the drum without reducing the pressure of the water sprayed from thespray unit 93. -
FIG. 7A is a view showing the change in level of water in the tub when wash water is supplied to perform main washing. When water stored to a first level in thetub 4 is heated and then water is supplied into thetub 4 for a subsequent step, the level of water in thetub 4 is abruptly increased from the first level to a second level. - When the
door 45 is closed, the space in thetub 4 is sealed. As previously described, however, the space in thetub 4 is not physically sealed, and a detailed description thereof will be omitted. - When the water stored in the
tub 4 is heated and then cold water is additionally supplied, the air in thetub 4 is instantaneously and abruptly condensed, with the result that high negative pressure is instantaneously and abruptly generated in the sealedtub 4, whereby the level of water stored in the tub is increased. - In this case, the tub cover and the door may be temporarily or permanently deformed, with the result that an unnecessary gap may be formed between the tub cover and the door.
- In addition, the negative pressure instantaneously and abruptly generated in the tub may be applied to the door, which is configured to be locked and unlocked by the push/open button type locking unit, such that the door is moved toward the inside of the tub, whereby the locking unit may be unlocked. In other words, when the negative pressure generated in the tub is higher than the force applied by the user in order to open the door, the door may be pulled, with the result that the door may be opened.
- Hereinafter, a method of minimizing the negative pressure that may be instantaneously and abruptly generated in the
tub 4 will be described. -
FIG. 7B is a view showing the change in level of water in the tub when intermittent water supply is performed before wash water is supplied to perform main washing.FIG. 8 is a flowchart showing a method of controlling the laundry treatment apparatus according to the present invention.FIG. 10 is a block diagram showing the construction of the laundry treatment apparatus according to the present invention. - Referring to
FIGs. 8 and10 , the method of controlling the laundry treatment apparatus according to the present invention may include a washing course selection step (S100) of selecting a heating course in which laundry is heated, a water supply step (S400) of supplying water to thetub 4, a heating step (S600) of heating the water stored in thetub 4, a negative pressure prevention step (S700) of performing intermittent water supply to supply water into thetub 4 for a first predetermined amount of time and to interrupt the supply of water for a second predetermined amount of time, a washing water supply step (S800) of supplying water to a washing level for washing after the negative pressure prevention step, and a main washing step (S900). - When a user selects a washing course at the washing course selection step (S100), the
controller 101 performs control such that a washing cycle is performed according to the selected washing course. - The washing cycle is a cycle of supplying water containing detergent into the tub and rotating the drum to wash laundry using frictional force generated on the inner circumferential surface of the drum and bending force caused by a stream of water generated in the tub.
- The heating course is a course in which water is supplied into the
tub 4 to a predetermined level before the washing cycle of washing the laundry and in which the wash water is heated to a predetermined temperature using theheater 411 provided in thetub 4 to remove microorganisms from the laundry and soak the laundry. - In this case, the wash water may be heated to about 90 °C or higher. The reason for this is that, when water is heated to about 90 °C or higher, germs or microorganisms present in laundry can be effectively killed.
- The heating course may be a boiling course in which wash water is boiled. In this case, the temperature of the wash water heated by the heater may be 100 °C.
- At the water supply step (S400), the amount of water that is supplied is set depending on the weight of laundry sensed at a laundry weight sensing step (not shown) performed before the heating course or the water supply step (S400).
- The water supply step (S400) may include a temperature sensing step (not shown) of sensing the temperature of water supplied into the
tub 4. - At the temperature sensing step (not shown), the temperature of water supplied into the
tub 4 may be sensed using atemperature sensor 106 provided in thetub 4. Alternatively, the temperature of water supplied into thetub 4 may be measured using atemperature sensor 106 provided in the first or second water supply pipe. - When the temperature of water sensed at the temperature sensing step is lower than a predetermined temperature, intermittent water supply may be repeated N1 times (S500 and S710). In the case in which intermittent water supply is repeated N1 times, water is supplied to a washing level for washing without performing the negative pressure prevention step (S700), and then the main washing step is performed.
- When the temperature of water sensed at the temperature sensing step is higher than the predetermined temperature, the negative pressure prevention step (S700) is performed.
- The predetermined temperature may be about 10 °C, which is the temperature of the water supplied from an external water supply source.
- When cold water having a temperature of about 10 °C supplied from the external water supply source is added to the water heated at the heating step (S600), the water in the tub is cooled due to an abrupt change in temperature and the air in the tub is contracted, with the result that negative pressure may be generated in the tub.
- In the case in which the temperature of water supplied from the outside is low, therefore, intermittent water supply is performed several times to reduce the temperature of the heated water in the
tub 4, thereby preventing negative pressure from being instantaneously generated due to a large amount of water being supplied at once. In this case, N1 times may be 30 times. - Meanwhile, the method of controlling the laundry treatment apparatus according to the present invention may include an initial level sensing step (S200) of sensing the initial level of water in the tub before the water supply step (S400).
- The initial level sensing step (S200) is performed after the washing course selection step. At the initial level sensing step (S200), whether water is present in the
tub 4 is determined before water is supplied into thetub 4. - When the initial level of water sensed at the initial level sensing step (S200) is lower than a predetermined level, the water supply step (S400) may be performed. When the initial level of water sensed at the initial level sensing step (S200) is higher than the predetermined level, intermittent water supply may be repeated N2 times (S500 and S710).
- The predetermined level may be a level at which the level of water stored in the tub is sufficient to be heated. Upon determining that the level of water in the tub is higher than the predetermined level, therefore, the heating step (S600), the washing water supply step (S800), and the main washing step (S900) may be performed without performing the water supply step (S400).
- Alternatively, upon determining that the level of water in the tub is higher than the predetermined level, a drainage step (not show) of draining water to reduce the level of water in the
tub 4 to a level for heating may be performed, followed by the heating step (S600), the washing water supply step (S800), and the main washing step (S900). Consequently, it is possible to make uniform the time for which the heating step is performed through the drainage step of draining water to reduce the level of water in the tub to the level for heating, thereby saving energy. In the case in which intermittent water supply is repeated N2 times, the washing water supply step (S800) and the main washing step (S900) are performed without performing the negative pressure prevention step (S700). - That the sensed initial level of water is higher than the predetermined level means that water has already been stored in the
tub 4. - When the
temperature sensor 106 cannot directly measure the temperature of water stored in thetub 4, it is not possible to measure the temperate of water stored in thetub 4. - In order to solve this problem, upon determining that water has already been stored in the
tub 4, intermittent water supply is performed several times to reduce the temperature of the heated water in thetub 4, thereby preventing negative pressure from being instantaneously generated due to a large amount of water being supplied at once. N2 times may be 30 times. - The laundry treatment apparatus according to the present invention may include a
water level sensor 102 for transmitting electromagnetic waves (including ultrasonic waves) to water and receiving the electromagnetic waves reflected by the water. - In one example, in the case in which the level of water in the
tub 4 is directly measured, thewater level sensor 102 is provided at the upper side of thetub 4 to measure the level of water stored in thetub 4. A water level frequency measured by the water level sensor is in inverse proportion to the level of water in the tub. That is, when the water level frequency is high, the level of water in the tub may be low, and when the water level frequency is low, the level of water in the tub may be high. - In another example, in the case in which the level of water in the
tub 4 is indirectly measured, thewater level sensor 102 may measure the level of water in a water level pipe 102a that is vertically provided so as to be parallel to thetub 4. The water level pipe 102a is connected to the lower side of thetub 4. Under atmospheric pressure, the level of water in thetub 4 is equal to the level of water in the water level pipe 102a. - At the heating step (S600), the
heater 411 installed at the bottom surface of thetub 4 is driven to heat the water stored in thetub 4. In addition, at the heating step (S600), water is supplied to a first level, which is lower than a washing level for main washing. The reason for this is that a large amount of time is required to heat a large amount of water. Consequently, water is supplied into thetub 4 only to a first level at which laundry is sufficiently immersed in the water. - If the washing water supply step (S800) is performed to directly supply water to the washing level after the heating step (S600), water is introduced into the
tub 4 to the washing level, which is higher than the first level, within a short time. As a result, the temperature of the water stored in thetub 4 is abruptly lowered, and the heated air in thetub 4 is abruptly condensed (i.e. contracted) due to the low-temperature water. - For this reason, high negative pressure is instantaneously generated in the
tub 4. As a result, thedoor 45 or thetub cover 43 may be deformed, a gap may be formed between thedoor 45 and thetub cover 43, or force may be applied to thedoor 45 such that the door is moved toward the inside of the tub, whereby the locking unit of the door may be unlocked and thus thedoor 45 may open. - In order to solve this problem, the negative pressure prevention step (S700) is performed.
FIG. 9 is a flowchart showing a control method for preventing negative pressure from being generated in the tub. Hereinafter, the negative pressure prevention step (S700) will be described. - At the negative pressure prevention step (S700), intermittent water supply is performed to supply water into the
tub 4 for a first predetermined amount of time and to interrupt the supply of water for a second predetermined amount of time. - The first predetermined amount of time may be shorter than the second predetermined amount of time. In order words, the second predetermined amount of time may be longer than the first predetermined amount of time. For example, the first predetermined amount of time may be about 0.1 seconds, and the second predetermined amount of time may be about 2 seconds. Consequently, a small amount of water is supplied, and then waiting is performed for a relatively long time such that the heated water in the
tub 4 sufficiently exchanges heat with the supplied water to achieve thermal equilibrium. - Specifically, the water supply time is shortened to supply a small amount of water into the tub such that the temperature of the heated water is not abruptly changed and such that negative pressure is not abruptly generated in the tub. However, the waiting time for which water is not supplied is long such that the water in the
tub 4 sufficiently exchanges heat with the supplied water to achieve thermal equilibrium. - In the intermittent water supply, the
controller 101 performs control such that thewater supply valve 77 is open for the first predetermined amount of time in order to supply water into thetub 4 through thespray unit 93 and such that thewater supply valve 77 is closed for the second predetermined amount of time to obtain the waiting time. - For example, when the intermittent water supply is performed twice, the
controller 101 performs control such that thewater supply valve 77 is open for the first predetermined amount of time and is closed for the second predetermined amount of time, which is repeated twice. - The negative pressure prevention step (S700) includes a comparative level sensing step (S720) of performing intermittent water supply N3 times and sensing a comparative level of water and a water level comparison step (S730) of comparing the sensed initial level of water with the sensed comparative level of water.
- Furthermore, the negative pressure prevention step (S700) may include an additional water supply step (S740) of further performing intermittent water supply N4 times based on the comparison result.
- At the comparative level sensing step (S720), the comparative level of water in the
tub 4 is sensed within the second predetermined amount of time included in each time period for intermittent water supply. Alternatively, the comparative level of water in thetub 4 is sensed after the second predetermined amount of time included in each time period for intermittent water supply. - The reason that the comparative level of water is measured after intermittent water supply at the comparative level sensing step (S720) is that negative pressure is generated in the tub due to the contraction of air caused by the abrupt change of temperature in the
tub 4 only when the intermittent water supply is performed. The greater the difference between the temperature of the supplied water and the temperature of the heated water in the tub, the higher the instantaneous negative pressure that is generated in the tub. Consequently, it is possible to indirectly measure the temperature of water in the tub because it is proportional to the magnitude of the instantaneous negative pressure. When high negative pressure is generated, the level of water in the tub is instantaneously greatly changed. - In brief, the greater the difference between the comparative level of water measured during intermittent water supply and a reference level of water, the higher the negative pressure that is instantaneously generated in the tub, from which it can be seen that the water in the tub has been heated to a high temperature. Consequently, the greater the difference between the comparative level of water and the reference level of water, the more intermittent water supply is performed to reduce the temperature of water stored in the tub such that the magnitude of instantaneous negative pressure generated in the tub when water is subsequently supplied for washing is reduced.
- At the comparative level sensing step (S720), N3 times may be 4 to 10 times, preferably 5 times. The reason that intermittent water supply is performed N3 times at the comparative level sensing step (S720) is that, when the comparative level of water is sensed after 1 to 3 times of intermittent water supply, the sensed comparative level of water may not reflect the level of water in the tub when a small amount of water is actually supplied into the tub. Consequently, the intermittent water supply is performed at least 5 times to set the comparative level of water to be used at the water level comparison step (S730).
- The highest one of the comparative levels of water sensed N3 times is selected as the comparative level of water sensed at the water level comparison step (S730). In the case in which the level of water in the tub is indirectly measured (i.e. in the case in which the water level frequency of the water level pipe communicating with the sealed tub is measured), the level of water in the tub at which the highest one of the water level frequencies sensed during N3 times of intermittent water supply is sensed is selected as the sensed comparative level of water. The reason for this is that, when the water level frequency is highest, the level of water in the tub is highest.
- At the water level comparison step (S730), the sensed comparative level of water is compared with the sensed initial level of water.
- When the difference between the comparative level of water and the initial level of water is less than a predetermined value, water is directly supplied to the washing level without additional intermittent water supply, and then main washing is performed. The reason for this is that, upon determining that the difference between the initial level of water and the comparative level of water measured in the case in which negative pressure is generated in the
tub 4 through previous N3 times of intermittent water supply is not great, it may be determined that the temperature of the heated water in the tub has been sufficiently lowered. - As a result, it may be determined that high negative pressure will not be generated in the
tub 4 even when water is subsequently supplied for main washing. In this case, no additional water supply is performed (i.e. N4 = 0). - When the difference between the comparative level of water and the initial level of water exceeds the predetermined value, the number of times of additional intermittent water supply is increased. That is, N4 is not fixed but varies depending on the difference. N4 may be preset and stored in the form of a table.
- Meanwhile, in the case in which the method of controlling the laundry treatment apparatus is temporarily stopped or completely stopped during intermittent water supply, the negative pressure prevention step (S700) is performed again from the beginning. That is, in the case in which the laundry treatment apparatus is temporarily stopped or completely stopped during intermittent water supply, the comparative level sensing step (S720), the water level comparison step (S730), and the additional water supply step (S740) are sequentially performed.
- When the laundry treatment apparatus is temporarily stopped or completely stopped, therefore, the case in which the temperature of water stored in the tub is unexpectedly changed, such as the case in which no water is supplied through the
water supply unit 7, is provided for, and negative pressure is prevented from being generated in the tub. - When intermittent water supply is performed several times after the interior of the tub is heated and before washing water supply for washing is performed, followed by washing water supply, as shown in
FIG. 7B , negative pressure may be instantaneously generated in the tub during the washing water supply. However, the generated negative pressure is not sufficiently high to deform the tub cover or the door or to unlock the push/open button type locking unit of the door. As a result, the door is not opened. - Hereinbefore, the method of controlling the laundry treatment apparatus to prevent instantaneous and abrupt difference in pressure between the inside and the outside of the
tub 4 has been described. - Hereinafter, the structural features of the laundry treatment apparatus for preventing instantaneous and abrupt difference in pressure between the inside and the outside of the
tub 4 will be described. - The laundry treatment apparatus according to the present invention may include an air channel unit for allowing the inside and the outside of the tub to communicate with each other. When high negative pressure or positive pressure is generated in the
tub 4, therefore, air may flow through the air channel unit, whereby it is possible to prevent instantaneous and abrupt difference in pressure between the inside and the outside of thetub 4. -
FIG. 11 is a view showing the state in which the door of the laundry treatment apparatus according to the present invention is open.FIG. 12 is a partial sectional view showing the laundry treatment apparatus according to the present invention.FIG. 13 is a view showing a tub air channel unit of the laundry treatment apparatus according to the present invention. Hereinafter, the tub air channel unit of the laundry treatment apparatus according to the present invention will be described with reference toFIGs. 11 to 13 . - The laundry treatment apparatus according to the present invention may include a
tub 4, including atub body 41 for storing water, atub cover 43 defining the upper surface of thetub body 41, anintroduction port 431 formed through thetub cover 43 for allowing laundry to be introduced therethrough, and asupport port 433 provided in thetub cover 43 for supplying water to thetub body 41, adrum 5 rotatably provided in the tub, thedrum 5 having an open surface communicating with theintroduction port 431, adoor 45 for opening and closing theintroduction port 431, and a tub air channel unit 47 provided in thetub cover 43 for allowing the inside and the outside of thetub 4 to communicate with each other. - The
tub body 41 is configured as a cylindrical shape that is open at the upper side thereof, and has a predetermined height. Wash water is stored in thetub body 41. Thetub cover 43 covers the upper side of thetub body 41 to define space for storing wash water in thetub 4. Consequently, the inside and the outside of thetub 4 to communicate with each other only through theintroduction port 431, which is provided in thetub cover 43. - The
introduction port 431 is a means for introducing laundry into thetub body 41 or removing the laundry from thetub body 41. Theintroduction port 431 is opened and closed by thedoor 45. - The
introduction port 431 may be configured as a polygonal shape, a circular shape, an oval shape, or a half-moon shape. In the present invention, theintroduction port 431 may be configured as a half-moon shape. The reason for this is that, even when thedrawer 3 is completely withdrawn from thecabinet 2, as shown inFIG. 1 , the upper surface of thetub 4 is not entirely visible. In the case in which theintroduction port 431 is provided only in the portion of the upper surface of thetub 4 that is withdrawn from thecabinet 2, theintroduction port 431 may be configured as a half-moon shape. In this case, the half-moonshape introduction port 431 includes astraight part 431a and a curved part 431b connected to thestraight part 431a. - The
introduction port 431 is provided at the front side of the tub cover 43 (i.e. in the positive x-axis direction). The reason for this is that, when thedrawer 3 is withdrawn, theintroduction port 431 is visible such that laundry can be introduced into or removed from thedrum 5. - The sectional area of the
introduction port 431 may be greater than half the sectional area of the upper surface of thetub cover 43. Meanwhile, the central axis of thetub 4 or thedrum 5 may be located in theintroduction port 431 such that the laundry received in thedrum 5 is easily visible. - The
supply port 433 is provided in the portion of thetub cover 43 at which theintroduction port 431 is not provided. That is, thesupply port 433 is provided in the upper surface of thetub cover 43 at the rear side of theintroduction port 431. In the case in which theintroduction port 431 is configured as a half-moon shape, thesupply port 433 is provided in thetub cover 43 so as to be spaced apart from thestraight part 431a of theintroduction port 431. Even when thedrawer 3 is completely withdrawn from thecabinet 2, thesupply port 433 is not exposed through theopen surface 21 of thecabinet 2, with the result that thesupply port 433 is not visible. - Meanwhile, the tub air channel unit 47 is configured to allow the inside and the outside of the
tub 4 to communicate with each other. When negative pressure is generated in thetub 4, air moves from the outside to the inside of thetub 4 through the tub air channel unit 47. When positive pressure is generated in thetub 4, air moves from the inside to the outside of thetub 4 through the tub air channel unit 47. Consequently, it is possible to prevent thedoor 45 from being opened or thetub 4 from being deformed due to instantaneous and abrupt difference in pressure between the inside and the outside of thetub 4. In addition, it is possible to prevent noise from being generated between thedoor 45 and thetub 4. - The tub air channel unit 47 may include an
air hole 471 formed through thetub cover 43 such that air can directly flow between the inside and the outside of the tub through theair hole 471. - The tub air channel unit 47 is provided between the
introduction port 431 and thesupply port 433. In other words, the tub air channel unit 47 may be provided in the central part of thetub cover 43. The water stored in thetub 4 moves upward due to the rotation of thedrum 4. The upwardly moving water moves upward along the inner circumferential surface of thetub body 41 and reaches the edge of thetub cover 43. Some of the upwardly moving water reaches the center of thetub cover 43. In order to maximally prevent water from being discharged from thetub 4, therefore, the tub air channel unit 47 may be provided between theintroduction port 431 and thesupply port 433, i.e. in the central part of thetub cover 43. - Meanwhile, the tub air channel unit 47 is provided in the upper surface of the tub cover, which is at the rear side of the
introduction port 431. In this case, the tub air channel unit 47 is not exposed to the outside of the cabinet when the drawer is completely withdrawn from the cabinet, with the result that the tub air channel unit 47 is not visible. - The
air hole 471 formed through thetub cover 43 may include afirst air hole 472 and asecond air hole 473 having a larger sectional area than thefirst air hole 472. In other words, the diameter of thesecond air hole 473 is greater than that of thefirst air hole 472. - The
second air hole 473 is closer to an imaginary line C interconnecting the centers of thesupply port 433 and theintroduction port 431 than thefirst air hole 472. In other words, thesecond air hole 473, the diameter of which is relatively large, is close to the central part of thetub 4, and thefirst air hole 473, the diameter of which is relatively small, is distant from the central part of thetub 4. As a result, it is possible to maximally prevent a stream of water moving upward in thetub 4 from being discharged to the outside through theair hole 471. - The
air hole 471 may include afirst group 4721 constituted by a plurality offirst air holes 472 and asecond group 4731 constituted by a plurality of second air holes 473. That is, thefirst group 4721 is a region in which a plurality offirst air holes 472 is provided, and thesecond group 4731 is a region in which a plurality of second air holes 473 is provided. - The
second group 4731 is closer to the imaginary line interconnecting the centers of thesupply port 433 and theintroduction port 431 than thefirst group 4721, and thefirst group 4721 is farther from the imaginary line than thesecond group 4731. In addition, thesecond group 4731 is closer to the center of thetub 4 than thefirst group 4721, and thefirst group 4721 is further from the center of thetub 4 than thesecond group 4731. Consequently, it is possible to maximally prevent a stream of water moving upward in thetub 4 from being discharged out of the tub. - In order to prevent the water discharged out of the
tub 4 through theair hole 471 from flowing to other components provided in thecabinet 2, thetub cover 43 may be provided in the upper surface thereof with a recess 474. In this case, theair hole 471 is provided in the bottom surface of the recess 474. Consequently, the water discharged out of thetub 4 through theair hole 471 is temporarily stored in the recess 474. When the rotation of thedrum 5 is stopped, the water stored in the recess 474 flows into thetub 4 through theair hole 471. - Alternatively, in order to prevent the water discharged out of the
tub 4 through theair hole 471 from flowing to other components provided in thecabinet 2, thetub cover 43 may be provided on the upper surface thereof with apartition wall 475, which protrudes to define a space part 474 that is open upward. In this case, theair hole 471 is provided in the bottom surface of the space part 474. Thepartition wall 475 is provided along a plurality ofair holes 471 to form a closed loop. Consequently, the water discharged out of thetub 4 through the air holes 471 is temporarily stored in the space part, and then flows into thetub 4 through the air holes 471. - Meanwhile, each of the air holes 471 is provided with a net 476. The net 476 is formed by a plurality of lines that intersect, and has a plurality of gaps. The net 476 is provided to block a corresponding one of the air holes 471. The
nets 476 maximally prevent wash water or bubbles from flowing through the air holes 471, and allow air to flow through the air holes 471. - The
nets 476 are provided in thefirst air holes 472 and thesecond air holes 473 to prevent wash water or bubbles from flowing through thefirst air holes 472 and the second air holes 473. Thenets 476 may be made of stainless steel or plastic. - The reason that a plurality of
air holes 471 is formed is that, if a single air hole is formed so as to have the same area as a plurality of air holes, the air hole may be closed by water film. Water is cohesive, whereby water film is easily formed. Consequently, a single air hole and a single net may be blocked by water film formed by water and bubbles. As a result, air may not flow between the inside and the outside of thetub 4 due to negative pressure instantaneously and abruptly in thetub 4. In contrast, some of the air holes may be blocked by water film formed by water and bubbles; however, the other air holes are not blocked by the water film, whereby air may flow between the inside and the outside of thetub 4. - Meanwhile, the laundry treatment apparatus according to the present invention may further include a
filter 477 provided in the recess 474 or the space part 474. Thefilter 477 absorbs water or bubbles flowing through theair hole 471 to prevent the water or bubbles from being discharged from the upper surface of thetub cover 43 to the outside. - Meanwhile, the laundry treatment apparatus according to the present invention may further include a door air channel unit 49 provided in the
door 45 for allow the inside and the outside of thetub 4 to communicate with each other. - Consequently, it is possible to prevent instantaneous and abrupt difference in pressure between the inside and the outside of the
tub 4. -
FIG. 14 is a view showing a door air channel unit of the laundry treatment apparatus according to the embodiment of the present invention.FIG. 15 is a sectional view of the door air channel unit of the laundry treatment apparatus according to the embodiment of the present invention. The door air channel unit 49 will be described with reference toFIGs. 14 and15 . - The door air channel unit 49 is provided in the
door 45, unlike the tub air channel unit 47, which is provided in thetub cover 43. - The
door 45 opens and closes theintroduction port 431. Thedoor 45 includes aframe 451 hingedly connected to thetub cover 43 and awindow 455 provided at theframe 451. - The
window 455 is provided in theframe 451 so as to surround thewindow 455. The shape of theframe 451 may be configured to correspond to that of the introduction port 431 (seeFIG. 1 ), or may be configured to cover the introduction port (seeFIG. 14 ). - The
frame 451 includes ahinge socket 453a, into which ahinge shaft 435 provided on the upper surface of thetub cover 43 is inserted such that theframe 451 is hingedly connected to thetub cover 43. - The
hinge shaft 435 protrudes from the upper surface of thetub cover 43. Thehinge socket 453a is provided inside thereof with a predetermined space, into which thehinge shaft 435 is inserted. Thehinge socket 453a is formed at the rear end of theframe 451. Twohinge sockets 453a are provided at the rear end of theframe 451 so as to be spaced apart from each other. - The
window 455 may be made of a transparent material such that a user can check the interior of thetub body 41 when thedrawer 3 is withdrawn from thecabinet 2. Thewindow 455 is provided in a window mounting part formed through theframe 451. The shape of thewindow 455 may be configured to correspond to that of theintroduction port 431. Alternatively, the area of thewindow 455 may be less than that of theintroduction port 431. - In order to prevent the water in the
tub body 41 from being discharged out of thetub body 41 through theintroduction port 431, one of theframe 451 and thetub cover 43 may be provided with a sealingportion 459 for sealing the space between theframe 451 and theintroduction port 431 when thedoor 45 closes theintroduction port 431. - The sealing
portion 459 is made of rubber. When thedoor 45 is fastened to theintroduction port 431 via the hook, the sealingportion 459 seals the gap between thedoor 45 and thetub cover 43 while pressing the lower surface of thedoor 45 and the upper surface of thetub cover 43. The shape of the sealingportion 459 may be configured to correspond to that of theintroduction port 431. - The sealing
portion 459 may be mounted to a sealingportion fixing part 459a provided at theframe 451. The sealingportion fixing part 459a may be concavely provided in the lower surface of theframe 451 so as to have a predetermined depth. Alternatively, the sealingportion fixing part 459a may include two fixingpart partition walls 475 protruding from the lower surface of theframe 451 to a predetermined height. The fixingpart partition walls 475 are spaced apart from each other. Each of the fixingpart partition walls 475 is formed so as to have a closed loop. The sealingportion 459 is mounted between the fixingpart partition walls 475. - The sealing
portion fixing part 459a may be provided around thewindow 455. The shape of the sealingportion fixing part 459a may be configured to correspond to that of theintroduction port 431. - The sealing
portion 459 includes an attachment anddetachment protrusion 459b protruding toward thedoor 45 such that the sealingportion 459 is easily attached to and detached from thedoor 45. Thedoor 45 includes a sealingportion insertion part 459c, into which the attachment anddetachment protrusion 459b is inserted so as to be fixed to thedoor 45. The sealingportion insertion part 459c is provided inside the sealingportion fixing part 459a. - Meanwhile, the door air channel unit 49 may be formed through the
door 45 or theframe 451 to allow the inside and the outside of thetub 4 to communicate with each other. - Steam or hot water generated in the
tub 4 may be discharged through the door air channel unit 49. In order to prevent injury, therefore, the door air channel unit 49 may be located at the vicinity of the shaft of theframe 451. In other words, the door air channel unit 49 may be provided at the rear end of theframe 451 or between theframe 451 and thehinge socket 453a. - The door air channel unit 49 may extend from the upper surface to the lower surface of the
door 45 or theframe 451. If steam or hot water generated in thetub 4 is discharged through the upper surface of thedoor 45 or theframe 451, however, a safety-related accident may occur. - In order to solve the above problem, the end of the door air channel unit 49, which allows the inside and the outside of the
tub 4 to communicate with each other, may be provided in the lower surface of thedoor 45 or theframe 451. - Specifically, the door air channel unit 49 may include a
hollow portion 495 provided in thedoor 45, afirst air channel 491 for allowing the inside of the tub and thehollow portion 495 to communicate with each other, and asecond air channel 493 for allowing the outside of thetub 4 and thehollow portion 495 to communicate with each other. - In this case, the end of the
first air channel 491 and the end of thesecond air channel 493 communicate with the lower side (i.e. the lower surface) of thedoor 45 such that steam or hot water discharged from thetub 4 is not directly transmitted to a user. - The end of the
first air channel 491 communicates with the inside of thetub 4. Consequently, the end of thefirst air channel 491 may be provided adjacent to the center of thetub 4 in order to maximally prevent water or bubbles from being introduced into thefirst air channel 491. The end of thesecond air channel 493 communicates with the outside of thetub 4. Consequently, the end of thesecond air channel 493 may be provided farther from the center of thetub 4 than the end of thefirst air channel 491. - The end of the
first air channel 491 is provided outside the sealingportion fixing part 459a, and the end of thesecond air channel 493 is provided inside the sealingportion fixing part 459a. - The end of the
first air channel 491 may be provided at the center of thedoor 45 or theframe 451 in the leftward-rightward direction (i.e. the Y-axis direction or the lateral direction), and the end of thesecond air channel 493 may be provided between theframe 451 and thehinge socket 453a. In this case, thehollow portion 495, which communicates with thefirst air channel 491 and thesecond air channel 493, is provided in theframe 451 in the leftward-rightward direction. - The
hollow portion 495 may be provided above the sealingportion fixing part 459a. Thehollow portion 495 and the sealingportion fixing part 459a may communicate with each other through the sealingportion insertion part 459c. The attachment anddetachment protrusion 459b of the sealingportion 459 may be inserted and fastened into thehollow portion 495 through the sealingportion insertion part 459c. - The present invention has the effect of preventing instantaneous and abrupt difference in pressure between the inside and the outside of the
tub 4 owing to the above structural features thereof. - In addition, the present invention has the effect of preventing noise from being generated by air flowing through the gap between the
door 45 and thetub cover 43 when thedoor 45 is opened or closed. - Furthermore, the present invention has the effect of preventing the
water level sensor 102 from incorrectly measuring the level of water, which may occur due to the instantaneous difference in pressure between the inside and the outside of thetub 4. - As previously described, the laundry treatment apparatus according to the previous embodiment may be an auxiliary laundry treatment apparatus that is coupled to a main laundry treatment apparatus. For example, a general washing apparatus may be referred to as a first washing apparatus, and a washing apparatus according to this embodiment may be referred to as a second washing apparatus. In this case, the first washing apparatus and the second washing apparatus may constitute a single laundry treatment apparatus. The first washing apparatus and the second washing apparatus may be separately manufactured so as to be capable of being coupled to each other. The second washing apparatus may be disposed on or under the first washing apparatus.
- Hereinafter, an embodiment of a laundry treatment apparatus including a first washing apparatus and a second washing apparatus provided in a single cabinet will be described. The basic features of the second washing apparatus may be identical to those of the previous embodiment. That is, since the height and volume of the second washing apparatus are smaller than those of the first washing apparatus, the possibility of bubble generation is high, and it is critical to prevent the generation of bubbles.
- As shown in
FIGs. 16 and17 , a laundry treatment apparatus according to another embodiment of the present invention includes a front loading typelaundry treatment apparatus 200 and a top loading typelaundry treatment apparatus 100 disposed on the front loading type laundry treatment apparatus. - The top loading type
laundry treatment apparatus 100 may be integrally coupled to the front loading typelaundry treatment apparatus 200. - The front loading type laundry treatment apparatus is a laundry treatment apparatus configured such that an opening is provided in the front of the laundry treatment apparatus and such that the shaft of a drum is parallel to the ground or inclined from the ground by a predetermined angle, and the top loading type laundry treatment apparatus is a laundry treatment apparatus configured such that an opening is provided in the top of the laundry treatment apparatus and such that the shaft of a drum is perpendicular to the ground.
- The front loading type
laundry treatment apparatus 200 may be defined as a first laundry treatment apparatus, and the top loading typelaundry treatment apparatus 100 may be defined as a second laundry treatment apparatus. - The laundry treatment apparatus according to this embodiment may be configured such that the front loading type
laundry treatment apparatus 200 and the top loading typelaundry treatment apparatus 100 are separately provided, such that the front loading typelaundry treatment apparatus 200 and the top loading typelaundry treatment apparatus 100 are coupled to each other, or such that the front loading typelaundry treatment apparatus 200 and the top loading typelaundry treatment apparatus 100 are integrated. - The laundry treatment apparatus according to this embodiment may include a
first cabinet 210 having afirst opening 217 formed in the front thereof, a firstlaundry receiving unit 220 and 240 provided in thefirst cabinet 210 for receiving laundry, asecond cabinet 110 provided on thefirst cabinet 210, thesecond cabinet 110 having asecond opening 111 formed in the top thereof, and a second laundry receiving unit 120 and 140 provided in thesecond cabinet 110 for receiving laundry. The second laundry receiving unit 120 and 140 may be a drum, which may be rotatably provided in atub 4. - The
first cabinet 210 may define the external appearance of the firstlaundry treatment apparatus 200, and thesecond cabinet 110 may define the external appearance of the secondlaundry treatment apparatus 100. - In addition, the
first cabinet 210 and thesecond cabinet 110 may be coupled to each other to define the entire external appearance of the laundry treatment apparatus according to this embodiment. - The
first cabinet 210 may be provided at the front thereof with afirst display unit 295 for displaying the state of the firstlaundry treatment apparatus 200, afirst input unit 291 for allowing an operation command of the firstlaundry treatment apparatus 200 to be input, and afirst controller 290 for controlling the operation of the firstlaundry treatment apparatus 200. - In addition, the
second cabinet 110 may be provided at the top thereof with a second display unit 195 for displaying the state of the secondlaundry treatment apparatus 100, asecond input unit 191 for allowing an operation command of the secondlaundry treatment apparatus 100 to be input, and asecond controller 190 for controlling the operation of the secondlaundry treatment apparatus 100. - In the case in which the second
laundry treatment apparatus 100 is coupled to the upper part of the firstlaundry treatment apparatus 200 or in the case in which the firstlaundry treatment apparatus 200 and the secondlaundry treatment apparatus 100 are integrated, one selected from between thefirst controller 290 and thesecond controller 190 may control both the first laundry treatment apparatus and the second laundry treatment apparatus. - In addition, operation commands may be input to both the first laundry treatment apparatus and the second laundry treatment apparatus through the
first input unit 291, or operation commands may be input to both the first laundry treatment apparatus and the second laundry treatment apparatus through thesecond input unit 191. - Each of the
first display unit 295 and the second display unit 195 may include a panel, such as an LCD panel or an LED panel. In addition, each of thefirst display unit 295 and the second display unit 195 may include a speaker for outputting a sound to provide a user with information. - That is, the
first display unit 295 and the second display unit 195 may display information about the laundry treatment apparatuses, and an alarm may be output to provide the user with information. - Meanwhile, the first
laundry treatment apparatus 200 may be configured as a washing apparatus for washing laundry using detergent and water or as a drying apparatus for drying laundry using hot air. - In the case in which the first
laundry treatment apparatus 200 is configured as a washing apparatus, the firstlaundry receiving unit 220 and 240 may include afirst tub 220 having afirst introduction port 221 that communicates with thefirst opening 217 and providing space for storing water and a first drum 240 rotatably provided in thefirst tub 220 for receiving laundry. - In the case in which the first
laundry treatment apparatus 200 is configured as a drying apparatus, the firstlaundry receiving unit 220 and 240 may include a first drum 240 rotatably provided in thefirst cabinet 210 for receiving laundry. -
FIGs. 16 and17 show the case in which the firstlaundry treatment apparatus 200 is configured as a washing apparatus. However, the case in which the firstlaundry treatment apparatus 200 is configured as a drying apparatus is not excluded. - In addition, the second
laundry treatment apparatus 100 may be configured as a washing apparatus for washing laundry using detergent and water or as a drying apparatus for drying laundry using hot air. - In the case in which the second
laundry treatment apparatus 100 is configured as a washing apparatus, the second laundry receiving unit 120 and 140 may include a second tub 120, having asecond introduction port 121 that communicates with thesecond opening 111 and providing space for storing water, and a second drum 140, rotatably provided in the second tub 120 for receiving laundry. - A
water level sensor 127 for sensing the level of water in the second tub 120 may be provided at one side of the second tub 120, and atemperature sensor 128 for sensing the temperature of the second tub 120 may be provided at the inner circumferential surface of the second tub 120. - In the case in which the second
laundry treatment apparatus 100 is configured as a drying apparatus, the second laundry receiving unit 120 and 140 may include a second drum 140 rotatably provided in thesecond cabinet 110 for receiving laundry. -
FIGs. 16 and17 show the case in which the secondlaundry treatment apparatus 100 is configured as a washing apparatus. However, the case in which the secondlaundry treatment apparatus 100 is configured as a drying apparatus is not excluded. - The first
laundry treatment apparatus 200 may include afirst door 230 for opening and closing thefirst opening 210. Thefirst door 230 may be called as a first cabinet door. Thefirst door 230 may include adoor gasket 231 for sealing thefirst introduction port 221 formed in thefirst tub 220 when thefirst opening 210 is closed. - Meanwhile, the first
laundry treatment apparatus 200 may include a first water supply unit 260 for supplying water to thefirst tub 220 and a first drainage unit 270 for draining water from thefirst tub 220. - The first water supply unit 260 may include a first
water supply pipe 261 for supplying water from an external water supply source to thefirst tub 220, adetergent box 220 for mixing detergent with the water supplied to the firstwater supply pipe 261 and supplying the mixture to thefirst tub 220, and a first supply pipe 263 connecting thedetergent box 220 to thefirst tub 220 for supplying the water and the detergent to thefirst tub 220. - The first drainage unit 270 may include a
first drainage pipe 272 provided under thefirst tub 220 for draining water from thefirst tub 220 and afirst drainage pump 271 for draining water in thefirst drainage pipe 272 out of thefirst cabinet 210. - Meanwhile, the first
laundry treatment apparatus 200 may include a supporting and dampingunit 280 for supporting thefirst tub 220 in thefirst cabinet 210 and damping vibration generated from thefirst tub 220 such that the vibration is not transmitted to thefirst cabinet 210. - The supporting and damping
unit 280 may be configured as a damper, a spring, or a combination thereof. A plurality of supporting and damping units may be provided. - A supporting and damping
unit 280 may be provided at the upper part or the lower part of thefirst tub 220, or supporting and dampingunits 280 may be provided at the upper part and the lower part of thefirst tub 220. - Meanwhile, the first
laundry treatment apparatus 200 may include afirst driving unit 250 for rotating thefirst drum 230. - The
first driving unit 250 may include afirst stator 251 provided at the rear surface of thefirst tub 220 for generating a rotating magnetic field, afirst rotor 252 configured to be rotated by the rotating magnetic field generated by thefirst stator 251, and ashaft 253 having one end connected to thefirst rotor 252 and the other end extending through thefirst tub 220 so as to be connected to the first drum 240. - The
shaft 252 may be configured to be parallel to the ground or to be inclined upward from the ground. - The first drum 240 may include a lifter 241 for lifting and dropping laundry when the first drum 240 is rotated to improve washing performance. In addition, the first drum 240 may be provided in the inner circumferential surface thereof with a plurality of through
holes 242 through which water is introduced or discharged. - Meanwhile, the height of the second
laundry treatment apparatus 100 is limited, since the secondlaundry treatment apparatus 100 is disposed on the firstlaundry treatment apparatus 200. That is, if the secondlaundry treatment apparatus 100 is higher, the washing capacity of the secondlaundry treatment apparatus 100 is further increased; however, it is difficult for a user to access thesecond opening 111. - As a result, the second tub 120 is relatively low, with the result that water or laundry received in the second tub 120 may be discharged out of the second tub 120.
- For this reason, the second tub 120 may include a tub door 130 for opening and closing the
second introduction port 121. The tub door 120 closes thesecond introduction port 121 to prevent water or laundry received in the second tub 120 from being discharged out of the second tub 120. - The tub door 130 may be hingedly provided at the top of the second tub 120.
- The tub door 130 may include a
frame 131 hingedly coupled to the second tub via a door hinge 132, awindow 133 provided in the frame, and adoor handle 134 for separably coupling theframe 131 to the second tub 120. - The
window 133 may be made of a transparent material such that a user can check the interior of the second tub 120. - Meanwhile, in order to prevent the water in the second tub 120 from being discharged out of the second tub 120 through the
second introduction port 121, a sealing part 135 for sealing the space between theframe 131 and thesecond introduction port 121 when the tub door 130 closes thesecond introduction port 121 may be provided at one selected from between theframe 131 and the inner circumferential surface of thesecond introduction port 121. - The second
laundry treatment apparatus 100 may include a second water supply unit 160 for supplying water to the second tub 120 and asecond drainage unit 170 for draining water from the second tub 120. - The second water supply unit 160 may include a second
water supply pipe 161 for supplying water from an external water supply source to the second tub 120 and awater supply valve 162 for adjusting the flow rate in the secondwater supply pipe 161. - The
second drainage unit 170 may include asecond drainage pipe 172 provided under the second tub 120 for draining water from the second tub 120 and asecond drainage pump 171 communicating with thesecond drainage pipe 172 for draining water in thesecond drainage pipe 172 out of thesecond cabinet 110. - The second water supply unit 160 and the
second drainage unit 170 may be provided separately from the first water supply unit 260 and the first drainage unit 270, respectively. - The second water supply unit 160 and the
second drainage unit 170 may be integrally formed with the first water supply unit 260 and the first drainage unit 270, respectively, or may diverge from the first water supply unit 260 and the first drainage unit 270, respectively. - The reasons for this are that the second
laundry treatment apparatus 100 may be separably coupled to the firstlaundry treatment apparatus 200 or the secondlaundry treatment apparatus 100 and that the firstlaundry treatment apparatus 200 may be independently provided. - The top of the
second cabinet 110 may be defined by acover door 116. Thecover door 116 may be hingedly provided at one side of thesecond cabinet 110. Thecover door 116 may be hingedly coupled to thesecond cabinet 110 via a cover hinge 117. The cover hinge 117 may be provided at one side of thecover door 116. - The second drum 140 may include a
drum introduction port 141 communicating with thesecond introduction port 111. In addition, the second drum 140 may be provided in the inner circumferential surface thereof with a plurality of throughholes 142, through which water is introduced from or discharged to the second tub 120. - Meanwhile, the second
laundry treatment apparatus 100 may include asecond driving unit 150 for rotating the second drum 140 in the second tub 120. - The
second driving unit 150 may include asecond stator 151 fixed to the lower surface of the second tub 120 for generating a rotating magnetic field, asecond rotor 152 configured to be rotated by the rotating magnetic field generated by thesecond stator 151, and ashaft 153 having one end connected to thesecond rotor 152 and the other end extending through the second tub 120 so as to be connected to the second drum 140. - Meanwhile, although not shown, the second
laundry treatment apparatus 100 may include aheater 126 for heating the water stored in the second tub 120. - In addition, the second
laundry treatment apparatus 100 may include atemperature sensor 128 for measuring the temperature of the second tub 120 and awater level sensor 127 for sensing the level of water in the second tub 120. - Meanwhile, the second
laundry treatment apparatus 100 may include acover door 116 for opening and closing thesecond opening 111. - The reason for this is that, if the second water supply unit 160, the
second drainage unit 170, and thesecond driving unit 150, which are provided in thesecond cabinet 110 and the second tub 120, are exposed to the outside, the aesthetic appearance of the second laundry treatment apparatus is deteriorated and a safety-related accident may occur. - Meanwhile, the second
laundry treatment apparatus 100 may include a support unit 180 for supporting the second tub 120 in thesecond cabinet 110. - The support unit 180 may include a first support part 181 provided at the
second cabinet 110, asecond support part 182 provided at the second tub 120, and aconnection part 183 for connecting the first support part 181 and thesecond support part 182 to each other. - The first support part 181 is provided higher than the
second support part 182. One end of theconnection part 183 is coupled and fixed to the first support part 181, and the other end of theconnection part 183 supports thesecond support part 182 such that the second tub 120 is fixed in thesecond cabinet 110. - The first support part 181 may be configured as a first bracket protruding from the
second cabinet 110. Thesecond support part 182 may be configured as a second bracket protruding from the second tub 120. Theconnection part 183 may connect the first bracket and the second bracket to each other. Theconnection part 183 may be configured to be perpendicular to the ground. - Consequently, the volume of the support unit 180, including the
connection part 183, may be minimized, whereby the washing capacity of the second tub 120 may be further increased. - The
connection part 183 may include afirst connection part 183a extending through the first support part 281 so as to be located in the first support part 281, asecond connection part 183b extending through thesecond support part 182 so as to support thesecond support part 182, and aconnection bar 183c for connecting thefirst connection part 183a and thesecond connection part 183b to each other. - The diameter of the
first connection part 183a and thesecond connection part 183b may be greater than that of theconnection part 183c. Thefirst connection part 183a and thesecond connection part 183b may be formed in the shape of a disc, a hemisphere, or a sphere. Consequently, theconnection part 183 may be stably coupled to the first support part 181 and to thesecond support part 182. - According to an embodiment of the present invention, it is possible to provide a laundry treatment apparatus that is capable of preventing abrupt negative pressure from being generated in a tub and a method of controlling the same.
- According to an embodiment of the present invention, it is possible to provide a laundry treatment apparatus that is capable of preventing abrupt negative pressure from being generated in a tub irrespective of the temperature of water supplied from the outside and a method of controlling the same.
- According to an embodiment of the present invention, it is possible to provide a laundry treatment apparatus that is capable of preventing a door from being deformed or opened by negative pressure in a tub and a method of controlling the same.
- According to an embodiment of the present invention, it is possible to a laundry treatment apparatus that is capable of preventing instantaneously high negative pressure from being generated in a tub and a method of controlling the same.
- According to an embodiment of the present invention, it is possible to provide a laundry treatment apparatus that is capable of preventing instantaneously abrupt negative pressure from being generated in a tub due to the amount of air being greater than the amount of air flowing per unit time between the inside and the outside of the tub and a method of controlling the same.
- According to an embodiment of the present invention, it is possible to provide the structure of a tub that is capable of allowing air to be introduced thereinto and to be discharged therefrom and of maximally preventing the introduction and discharge of wash water and bubbles and a laundry treatment apparatus including the same.
- According to an embodiment of the present invention, it is possible to provide a laundry treatment apparatus configured such that an air channel is formed in a tub cover located at the uppermost side of space, and the tub cover is coupled to a tub, whereby the manufacture of the laundry treatment apparatus is easy and the structure of the laundry treatment apparatus is simple.
- Although the exemplary embodiments have been illustrated and described as above, of course, it will be apparent to those skilled in the art that the embodiments are provided to assist understanding of the present invention and the present invention is not limited to the above described particular embodiments, and various modifications and variations can be made in the present invention without departing from the scope of the present invention, and the modifications and variations should not be understood individually from the viewpoint or scope of the present invention.
Claims (17)
- A laundry treatment apparatus (100) comprising:a cabinet (2) including a first opening (217) and a second opening (111);a first cabinet door (230) that is coupled to the cabinet (2) and that is configured to open or close the first opening;a second cabinet door (116) that is coupled to the cabinet (2) and that is configured to open or close the second opening (111);a first washing apparatus (200) that is located in the cabinet (2) and that is configured to treat laundry introduced into an interior area of the first washing apparatus (200) through the first cabinet door in a first direction; anda second washing apparatus (100) that is configured to treat laundry introduced into an interior area of the second washing apparatus (100) through the second cabinet door (116) in a second direction, the second washing apparatus including,a tub (4) that is accessible through the second opening (111) in a state in which the second cabinet door (116) is opened, that is configured to store water, and that includes a tub opening (44a) at a top of the tub (4),a tub cover (43) that is coupled to the tub (4) and that covers the tub opening (44a), anda drum (5) that is located in the tub (4) and that is configured to rotate about a shaft, the shaft extending in the second direction, characterized in thatthe tub cover (43) includes an air channel unit (47, 49) that is configured to transfer air between an interior area of the tub (4) and an exterior area of the tub (4) in a state in which the second washing apparatus (100) is operated.
- The laundry treatment apparatus according to claim 1, wherein the tub cover (43) is configured transfer air between the interior area of the tub (4) and the exterior area of the tub (4) only through the air channel unit (47, 49).
- The laundry treatment apparatus according to claim 1 or 2, wherein the tub cover (43) includes:a tub cover body (44) that is coupled to the tub (4), an introduction port (431) through which laundry is introduced, anda tub door (45) that is coupled to the tub cover body (44) and that is configured to open and close the introduction port (431).
- The laundry treatment apparatus according to claim 3, wherein the air channel unit (47, 49) includes at least one air hole (471) formed in the tub cover body (44).
- The laundry treatment apparatus according to claim 4, wherein
the tub cover (43) includes:a water supply port (433) through which water is supplied into the interior area of tub (4) from an external water supply source, andwherein the introduction port (431) is located at a first side of the tub cover and the water supply port (433) and the air hole (471) are located at a second side of the tub cover. - The laundry treatment apparatus according to claim 5, wherein the air hole (471) is located between the introduction port (431) and the water supply port (433).
- The laundry treatment apparatus according to any one of claims 4 to 6, wherein the air hole (471) includes;
a first air hole (472) that has a first sectional area, and
a second air hole (473) that has a second sectional area, and
wherein the second sectional area is larger than the first sectional area. - The laundry treatment apparatus according to any one of claims 4 to 7, wherein the tub cover body (44) includes a recess (474) that is recessed from an upper surface of the tub cover body and that is configured to hold water discharged from the tub (4), and
wherein the air hole (471) includes a plurality of air holes (471) that is located on a bottom surface of the recess (474). - The laundry treatment apparatus according to claim 8, wherein each of the plurality of air holes (471) is includes a mesh (476).
- The laundry treatment apparatus according to claim 8 or 9, further comprising a filter (477) that is coupled to the recess (474).
- The laundry treatment apparatus according to any one of claims 3 to 10, wherein the tub door (45) of the tub cover (43) includes the air channel unit (47, 49).
- The laundry treatment apparatus according to any one of claims 3 to 11, wherein the air channel unit (47, 49) includes:a hollow portion (495) that is located at the tub door (45);a first air channel (491) that is configured to transfer air between the interior area of the tub (4) and the hollow portion; anda second air channel (493) that is configured to transfer air between the exterior area of the tub (4) and the hollow portion.
- The laundry treatment apparatus according to claim 12, further comprising:a sealing portion (459) that is configured to seal a space between the introduction port (431), the tub door (45), and a sealing portion fixing part (459a) to which the sealing portion (459) is coupled and that is located adjacent to the hollow portion (495).
- The laundry treatment apparatus according to claim 13, wherein the sealing portion (459) includes a closed loop, and wherein the air channel unit (47, 49) extends between an inner area of the closed loop and an outer area of the closed loop.
- The laundry treatment apparatus according to any one of claims 3 to 14, wherein the tub door (45) includes:a frame (451) that is configured to rotate and that is coupled to the tub cover body (41);a transparent window (455) that is coupled to the frame (451); anda sealing portion (459) that is coupled to an inner surface of the tub door (45) and that is configured to seal the introduction port (431).
- The laundry treatment apparatus according to claim 15, wherein
the tub door (45) further includes a washing guide (456) that is configured to guide water in the tub (4) into a central area of the tub (4) from an edge area of the tub (4) in a state in which the drum is rotated - The laundry treatment apparatus according to any one of claims 8 to 16, further comprising a filter (477) that is coupled to the recess (474), through which air introduced from the air holes (471) passes, and that is configured to absorb water and bubbles from the air holes (471).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP19175356.5A EP3567150B1 (en) | 2016-05-30 | 2017-05-30 | Washing apparatus for treating laundry |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160066753A KR20170135209A (en) | 2016-05-30 | 2016-05-30 | Laundry Treating Apparatus and Control Method thereof |
US201662423201P | 2016-11-17 | 2016-11-17 | |
KR1020160172983A KR101848668B1 (en) | 2016-11-17 | 2016-12-16 | Laundry Treating Apparatus |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19175356.5A Division EP3567150B1 (en) | 2016-05-30 | 2017-05-30 | Washing apparatus for treating laundry |
Publications (2)
Publication Number | Publication Date |
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EP3252197A1 true EP3252197A1 (en) | 2017-12-06 |
EP3252197B1 EP3252197B1 (en) | 2019-05-22 |
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Application Number | Title | Priority Date | Filing Date |
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EP19175356.5A Active EP3567150B1 (en) | 2016-05-30 | 2017-05-30 | Washing apparatus for treating laundry |
EP17173494.0A Active EP3252197B1 (en) | 2016-05-30 | 2017-05-30 | Laundry treatment apparatus |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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EP19175356.5A Active EP3567150B1 (en) | 2016-05-30 | 2017-05-30 | Washing apparatus for treating laundry |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1666656A1 (en) * | 2004-12-02 | 2006-06-07 | Samsung Electronics Co., Ltd. | Drum type washing machine |
US20120234054A1 (en) * | 2007-06-13 | 2012-09-20 | Lg Electronics Inc. | Multiple laundry machine |
EP2949806A1 (en) * | 2014-05-30 | 2015-12-02 | LG Electronics Inc. | Laundry treatment apparatus |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101655589B1 (en) | 2014-12-03 | 2016-09-07 | 현대자동차주식회사 | Device and method for monitoring dry of fuel cell stack |
-
2017
- 2017-05-30 EP EP19175356.5A patent/EP3567150B1/en active Active
- 2017-05-30 EP EP17173494.0A patent/EP3252197B1/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1666656A1 (en) * | 2004-12-02 | 2006-06-07 | Samsung Electronics Co., Ltd. | Drum type washing machine |
US20120234054A1 (en) * | 2007-06-13 | 2012-09-20 | Lg Electronics Inc. | Multiple laundry machine |
EP2949806A1 (en) * | 2014-05-30 | 2015-12-02 | LG Electronics Inc. | Laundry treatment apparatus |
Also Published As
Publication number | Publication date |
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EP3567150A1 (en) | 2019-11-13 |
EP3567150B1 (en) | 2020-11-04 |
EP3252197B1 (en) | 2019-05-22 |
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