Dishwasher

Abstract

A dishwasher according to one embodiment may comprise: a tub forming a washing space and accommodating dishes; a moisture absorption drying device for absorbing moisture from the air discharged from the tub, and supplying same to the tub; and a washing pump for supplying washing water to the tub. The dishwasher may comprise: a blowing unit for supplying the air to the tub; a flow path duct which is connected to the washing pump and the blowing unit, and through which the washing water or the air selectively flows; and a heating unit disposed in the flow path duct so as to heat the washing water or the air.

Description

dishwasher

[0001] The present invention relates to a dishwasher, and more particularly, to a dishwasher capable of heating wash water and air using the same heating device to increase volumetric efficiency and reduce manufacturing costs.

[0002] The material described in this section merely provides background information for the present invention and does not constitute prior art.

[0003] A dishwasher is a device that washes items stored inside, such as dishes and cooking utensils, by spraying a cleaning solution, such as water. The cleaning solution may contain detergent.

[0004] A dishwasher is generally configured to include a washing tank (tub) that forms a washing space, a storage section that accommodates objects to be washed inside the washing tank, a spray arm that sprays washing water into the storage section, and a sump that stores water and supplies washing water to the spray arm.

[0005] By using this dishwasher, the time and effort required to wash dishes and other items after a meal can be reduced, contributing to user convenience.

[0006] Typically, a dishwasher is configured to perform a washing cycle for washing an object to be washed, a rinsing cycle for rinsing the object to be washed, and a drying cycle for drying the object to be washed after washing and rinsing are completed.

[0007] Recently, dishwashers equipped with a moisture absorbing device that absorbs water vapor contained in the air discharged from the tub during the drying process and then resupplies it to the tub, thereby reducing the drying time for the items to be washed have been released.

[0008] In this regard, European Patent Publication No. 2763578 discloses a dishwasher comprising a moisture absorbing device.

[0009] A dishwasher can perform a washing process by spraying washing water onto dishes stored in a tub, and a rinsing process by rinsing the dishes. Furthermore, the dishwasher can perform a drying process by spraying heated air onto the dishes stored in the tub, thereby drying the dishes.

[0010] Meanwhile, in dishwashers using a desiccant dryer, the desiccant can absorb moisture during the drying process, becoming wet. Therefore, to dry the wet desiccant, the dishwasher can perform a regeneration process that sprays heated air onto the desiccant.

[0011] Washing and rinsing require heating of the wash water. Therefore, typical dishwashers are equipped with a heating device to heat the wash water during the washing and rinsing processes, and another heating device to heat the air during the drying and regeneration processes.

[0012] When a dishwasher is equipped with multiple, different heating devices, each of which occupies a certain volume, the volumetric efficiency of the dishwasher can deteriorate. Furthermore, the control logic in the control unit for controlling the different heating devices can become complex. This can also increase the manufacturing cost of the dishwasher.

[0013] An object of the present invention is to provide a dishwasher having a structure that selectively heats wash water or air using the same heating element.

[0014] In addition, it is an object of the present invention to provide a dishwasher having a structure capable of reducing the length and volume of an air pipe connecting a tub and a duct in which a heating unit is arranged.

[0015] In addition, it is an object of the present invention to provide a dishwasher having a structure capable of improving the drying performance of the dishwasher during the drying process.

[0016] The purposes of the present invention are not limited to those mentioned above. Other purposes and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the purposes and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0017] One embodiment of the dishwasher may include a flow duct connected to a washing pump and a blower, through which washing water or air selectively flows, and a heating unit disposed in the flow duct for heating the washing water or air.

[0018] The duct may be equipped with a plurality of valves for controlling the flow of air or wash water. The plurality of valves may be selectively opened or closed to selectively allow air or wash water to flow through the duct and be heated.

[0019] This allows the same heating element to be used to heat air and washing water, thereby increasing the volumetric efficiency of the dishwasher and simplifying its structure.

[0020] One embodiment of the dishwasher may include a desiccant drying device that absorbs moisture from air discharged from the tub and supplies it to the tub. The desiccant drying device and the heating unit may be positioned at the bottom of the tub.

[0021] The dishwasher includes a first air duct formed to penetrate the lower plate of the tub, and a flow duct can be connected to the first air duct. This structure can reduce the length and volume of the air duct connecting the flow duct and the tub.

[0022] The dishwasher includes a second air duct formed to penetrate the upper portion of the side plate of the tub, and a flow duct can be connected to the second air duct. This structure allows heated air introduced into the tub to be evenly distributed throughout the interior of the tub, effectively drying dishes stored in the tub before being discharged from the tub.

[0023] The desiccant drying device can be placed between the lower and upper racks. Therefore, when the drying process is in progress, the extremely dry and high-temperature air discharged from the outlet is discharged to a location close to and between the lower and upper racks, where most dishes are stored, and can dry the dishes as it passes through the lower and upper racks.

[0024] A dishwasher according to one embodiment may include a tub that forms a washing space and accommodates dishes, a moisture absorption and drying device that absorbs moisture from air discharged from the tub and supplies it to the tub, and a washing pump that supplies washing water to the tub.

[0025] The dishwasher may include a blower unit that supplies air to a tub, a washing pump and a flow duct connected to the blower unit, through which washing water or air selectively flows, and a heating unit that is disposed in the flow duct and heats the washing water or air.

[0026] The Euro duct can be connected to a washing pump and a tub to form a washing water path, and can be connected to a blower and a desiccant drying device to form an air path. The washing water path and air path can be selectively opened and closed.

[0027] The washing water flow path and the air flow path can be formed to be common at the location where the heating part is placed.

[0028] The euro duct may include a washing water inlet through which washing water flows in from the washing pump, and a washing water outlet through which washing water is discharged to the tub.

[0029] The euro duct may include an air inlet through which air is drawn in from the blower, and an air outlet through which air is discharged to the tub.

[0030] The euro duct may include a washing water inlet control valve that opens and closes the washing water inlet, and a washing water discharge control valve that opens and closes the washing water discharge.

[0031] The euro duct may include an air inlet control valve for opening and closing an air inlet, and an air exhaust control valve for opening and closing an air exhaust.

[0032] When washing water flows in the euro duct, the washing water inlet control valve and the washing water discharge control valve can be opened and the air inlet control valve and the air discharge control valve can be closed.

[0033] When air flows in the euro duct, the air inlet control valve and the air discharge control valve may be opened and the wash water inlet control valve and the wash water discharge control valve may be closed.

[0034] When the dishwasher is performing a dishwashing or rinsing process, the washing water inlet control valve and the washing water discharge control valve may be opened and the air inlet control valve and the air discharge control valve may be closed.

[0035] When the dishwasher is performing the drying process of dishes or the regeneration process of the moisture-absorbing dryer, the air inlet control valve and the air discharge control valve may be opened and the wash water inlet control valve and the wash water discharge control valve may be closed.

[0036] A desiccant drying device may include a desiccant that absorbs moisture contained in the air, and a housing that accommodates the desiccant.

[0037] The housing may include an outlet disposed downstream of the desiccant and discharging air into the tub, and a control damper for opening and closing the outlet.

[0038] The control damper can close the discharge port when washing water flows in the euro duct, and open the discharge port when air flows in the euro duct.

[0039] The control damper can close the discharge port when the dishwasher is performing a dishwashing process or a rinsing process, and can open the discharge port when the dishwasher is performing a dish drying process or a regeneration process of the moisture absorption drying device.

[0040] The dishwasher may be disposed in a tub and include a plurality of spray arms for spraying washing water, and a switching valve for selectively opening and closing a plurality of supply channels connected to the spray arms.

[0041] The washing water outlet can be connected to a switching valve.

[0042] The moisture absorbing and drying device and the heating unit can be placed at the bottom of the tub.

[0043] The dishwasher includes a first air pipe formed to penetrate a lower plate of a tub, an air inlet port is connected to the first air pipe, and a blower unit can be arranged in the first air pipe.

[0044] The dishwasher includes a second air pipe formed to penetrate the upper part of the side plate of the tub, an air inlet port is connected to the second air pipe, and a blower unit can be arranged in the second air pipe.

[0045] The moisture absorbing and drying device and the heating unit can be placed at the inner edge of the tub.

[0046] The dishwasher may include a lower rack disposed in a washing space and on which dishes are placed, and an upper rack disposed above the lower rack in the washing space and on which dishes are placed.

[0047] The desiccant drying device can be placed between the lower rack and the upper rack.

[0048] The dishwasher includes a third air pipe formed to penetrate a side plate of the tub, an air inlet is connected to an outlet of the third air pipe, and a blower can be arranged in the third air pipe.

[0049] The inlet of the third air pipe can be located on the upper side of the upper rack.

[0050] In the dishwasher according to the present invention, since the same heating unit is used to selectively heat the wash water or air according to each process of the dishwasher, the volumetric efficiency of the dishwasher can be increased, the structure can be simplified, and the manufacturing cost can be effectively reduced compared to a case where different heating devices are used to heat the wash water and air, respectively.

[0051] Additionally, in a dishwasher according to one embodiment, the length and volume of the air pipe connecting the duct and the tub can be reduced. Accordingly, the structure of the duct can be simplified, and the manufacturing cost of the dishwasher can be reduced.

[0052] In another embodiment, in a dishwasher, heated air introduced into the tub can be uniformly distributed throughout the interior of the tub, effectively drying dishes contained in the tub, and then discharged from the tub, since the outlet is located quite far away. Therefore, the drying performance of the dishwasher can be improved during the drying process.

[0053] In addition, in a dishwasher according to another embodiment, when the drying process is in progress, very dry and high temperature air discharged from the discharge port is discharged to a location close to and between the lower and upper racks where most of the dishes are stored, and can dry the dishes while passing through the lower and upper racks. That is, since the distance that the air flows from the discharge port to the lower and upper racks is very short, the air does not cool down well and dries the dishes without mixing moisture well, so that the drying efficiency of the dishwasher can be improved.

[0054] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0055] FIG. 1 is a front perspective view of a dishwasher according to one embodiment.

[0056] Figure 2 is a schematic cross-sectional view of the dishwasher illustrated in Figure 1.

[0057] Figure 3 is a schematic diagram of a dishwasher according to the first embodiment.

[0058] Figure 4 is an enlarged view showing a part of Figure 3.

[0059] Figure 5 is a schematic diagram of a dishwasher according to a second embodiment.

[0060] Figure 6 is an enlarged view showing a part of Figure 5.

[0061] FIG. 7 is a drawing for explaining a case where air flows in a euro duct in a dishwasher according to the first embodiment based on FIG. 4.

[0062] FIG. 8 is a drawing for explaining a case where washing water flows in a euro duct in a dishwasher according to the first embodiment based on FIG. 4.

[0063] Figure 9 is a schematic diagram of a dishwasher according to a third embodiment.

[0064] Figure 10 is an enlarged view showing part 10 of Figure 9.

[0065] FIG. 11 is a drawing for explaining a case where air flows in a euro duct in a dishwasher according to a third embodiment based on FIG. 10.

[0066] FIG. 12 is a drawing for explaining a case where washing water flows in a euro duct in a dishwasher according to a third embodiment based on FIG. 10.

[0067] The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily practice the technical idea of ​​the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0068] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0069] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0070] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consisting of" or "comprising" should not necessarily be construed to include all of the components or steps described in the specification, and should be construed to mean that some of the components or steps may not be included, or that additional components or steps may be included.

[0071] Throughout the specification, when we refer to "A and / or B", this means A, B, or A and B, unless otherwise stated, and when we refer to "C through D", this means C or more and D or less, unless otherwise stated.

[0072] [Overall structure of a dishwasher]

[0073] Hereinafter, the overall structure of a dishwasher (1) according to an embodiment of the present invention will be described in detail with reference to the attached drawings. Fig. 1 is a front perspective view of a dishwasher according to an embodiment. Fig. 2 is a schematic cross-sectional view of the dishwasher illustrated in Fig. 1.

[0074] As illustrated in FIGS. 1 and 2, a dishwasher (1) according to the present invention comprises a case (10) forming an outer shape, a tub (20) installed inside the case (10) and forming a washing space (21) in which an object to be washed is washed and having an open front, a door (30) for opening and closing the open front of the tub (20), a driving unit (40) located at the lower portion of the tub (20) for supplying, collecting, circulating, and draining washing water for washing an object to be washed, a storage unit (50) detachably provided in the internal washing space (21) of the tub (20) for placing an object to be washed, and a spray unit (60) installed adjacent to the storage unit (50) for spraying washing water for washing an object to be washed.

[0075] At this time, the objects to be washed placed in the storage unit (50) may be, for example, dishes, plates, spoons, chopsticks, and other cooking utensils. Unless otherwise stated, the objects to be washed are referred to as dishes.

[0076] The tub (20) can be formed in a box shape with the front entirely open, and corresponds to a configuration known as a so-called washing tank.

[0077] A washing space (21) is formed inside the tub (20), and the open front can be opened and closed by a door (30).

[0078] The tub (20) can be formed by pressing a metal plate that is resistant to high temperature and moisture, for example, a plate made of stainless steel.

[0079] In addition, a number of brackets may be arranged on the inner surface of the tub (20) for the purpose of supporting and installing functional components such as the storage section (50) and injection section (60) described later inside the tub (20).

[0080] Meanwhile, the driving unit (40) may be configured to include a sump (41) for storing washing water, a sump cover (42) for separating the sump (41) from the tub (20), a water supply unit (43) for supplying washing water from the outside to the sump (41), a drain unit (44) for discharging the washing water of the sump (41) to the outside, and a washing pump (45) and a supply path (46) for supplying the washing water of the sump (41) to the spray unit (60). The sump cover (42) is arranged on the upper side of the sump (41) and may serve to separate the tub (20) and the sump (41). In addition, the sump cover (42) may be provided with a plurality of recovery holes for recovering the washing water sprayed into the washing space (21) through the spray unit (60) to the sump (41).

[0081] That is, the washing water sprayed toward the dishes from the spray unit (60) falls to the lower part of the washing space (21) and can be recovered back to the sump (41) through the sump cover (42).

[0082] The washing pump (45) is provided on the side or bottom of the sump (41) and serves to pressurize the washing water and supply it to the spray unit (60).

[0083] One end of the washing pump (45) may be connected to the sump (41) and the other end may be connected to the supply path (46). The washing pump (45) may be equipped with an impeller (451) and a motor (453). When power is supplied to the motor (453), the impeller (451) rotates, and the washing water in the sump (41) is pressurized and then supplied to the injection unit (60) through the supply path (46).

[0084] Meanwhile, the supply path (46) can play a role in selectively supplying the washing water supplied from the washing pump (45) to the spray unit (60).

[0085] For example, the supply path (46) may include a first supply path (461) connected to the lower injection arm (61), a second supply path (463) connected to the upper injection arm (62) and the top nozzle (63), and the supply path (46) may be provided with a switching valve (465) that selectively opens and closes the supply paths (461, 463).

[0086] At this time, the switching valve (465) can be controlled so that each supply path (461, 463) is opened sequentially or simultaneously.

[0087] Meanwhile, the spray unit (60) is provided to spray washing water onto dishes, etc. stored in the storage unit (50).

[0088] In more detail, the spray unit (60) may include a lower spray arm (61) positioned at the bottom of the tub (20) and spraying washing water to the lower rack (51), an upper spray arm (62) positioned between the lower rack (51) and the upper rack (52) and spraying washing water to the lower rack (51) and the upper rack (52), and a top nozzle (63) positioned at the top of the tub (20) and spraying washing water to the top rack (53) or the upper rack (52).

[0089] In particular, the lower spray arm (61) and the upper spray arm (62) are rotatably provided in the washing space (21) of the tub (20) so that they can spray washing water while rotating toward the dishes in the storage unit (50).

[0090] The lower spray arm (61) can be rotatably supported on the upper side of the sump cover (42) so as to be able to spray washing water toward the lower rack (51) while rotating at the lower side of the lower rack (51).

[0091] Additionally, the upper spray arm (62) can be rotatably supported by the spray arm holder (467) so as to be able to spray the washing water while rotating between the lower rack (51) and the upper rack (52).

[0092] Meanwhile, although not shown, the lower surface (25) of the tub (20) may be further provided with a means for diverting the washing water sprayed from the lower spray arm (61) in an upward direction (U-direction) to increase the washing efficiency.

[0093] The detailed configuration of the injection unit (60) can be applied to a configuration already known in the art, so a description of the specific configuration of the injection unit (60) will be omitted below.

[0094] Meanwhile, a storage compartment (50) for storing dishes may be provided in the washing space (21).

[0095] The storage section (50) is provided so that it can be withdrawn from the inside of the tub (20) through the open front of the tub (20).

[0096] By way of example, FIG. 2 illustrates an embodiment in which a storage compartment is provided, including a lower rack (51) located at the bottom of a tub (20) and capable of storing relatively large dishes, an upper rack (52) located above the lower rack (51) and capable of storing medium-sized dishes, and a top rack (53) located at the top of the tub (20) and capable of storing small dishes. The present invention is not limited thereto, but will be described based on an embodiment of a dishwasher provided with three storage compartments (50) as illustrated.

[0097] These lower racks (51), upper racks (52) and top racks (53) can each be configured to be pulled out through the open front of the tub (20).

[0098] For this purpose, guide rails (not shown) may be provided on both sides of the wall forming the inner surface of the tub (20), and for example, the guide rails may include an upper rail, a lower rail, and a top rail.

[0099] Wheels may be provided at the bottom of each of the lower racks (51), upper racks (52), and top racks (53). By pulling the lower racks (51), upper racks (52), and top racks (53) outward through the front of the tub (20), the user can store dishes in them or easily take out washed dishes from them.

[0100] The guide rail may be provided as a fixed guide rail in the form of a simple rail for guiding withdrawal and insertion of the storage section (50) or as an elastic guide rail for guiding withdrawal and insertion of the storage section (50) and increasing the withdrawal distance according to withdrawal of the storage section (50).

[0101] Meanwhile, the door (30) has the purpose of opening and closing the open front of the above-described tub (20).

[0102] A hinge part (not shown) for opening and closing a door (30) is provided at the lower part of the normally open front, and the door (30) is opened by rotating around the hinge part as a rotation axis.

[0103] Here, the outer surface of the door (30) may be provided with a handle (31) for opening the door (30) and a control panel (32) for controlling the dishwasher (1).

[0104] As illustrated, the control panel (32) may be equipped with a display (33) that visually displays information about the current operating status of the dishwasher, a button section (34) including a selection button for inputting a user's selection operation, and a power button for inputting a user's operation for turning the dishwasher on and off.

[0105] Meanwhile, the inner surface of the door (30) can form one side of the tub (20) when the door (30) is closed, and at the same time, can form a seating surface on which the lower rack (51) of the storage section (50) can be supported when the door (30) is fully opened.

[0106] For this purpose, when the door (30) is fully opened, it is preferable that the inner surface of the door (30) form a horizontal plane in the same direction as the direction in which the guide rail along which the lower rack (51) is guided extends.

[0107] Meanwhile, a moisture absorption drying device (80) may be provided at the bottom or inside of the tub (20) to absorb moisture contained in the air discharged from the tub (20) during the drying process and then resupply the air back to the tub (20).

[0108] As shown, the desiccant drying device (80) may be configured to include a suction duct (81) through which air discharged from the tub (20) is sucked in, a blower (82) that generates an air current (F), a heating unit (83) that heats the air sucked in from the tub (20), and a desiccant (85) that absorbs moisture contained in the air.

[0109] In Fig. 2, the desiccant (85), the heating unit (83), and the blower unit (82) constituting the desiccant drying device (80) are illustrated as being arranged in a space formed under the lower surface (25) of the tub (20), but alternatively, the desiccant (85) and the heating unit (83) may be arranged inside the tub (20), and the blower unit (82) may be arranged outside the tub (20). In addition, they may be arranged in other ways.

[0110] Meanwhile, the moisture absorption drying device (80) may also have a structure different from the structure described above. The detailed structures of moisture absorption drying devices (80) having various types of structures will be described later with reference to FIG. 3 and below.

[0111] The dishwasher can perform a washing process to wash dishes by spraying washing water on the dishes contained in the tub (20) and a rinsing process to rinse the dishes. In addition, the dishwasher can perform a drying process to dry the dishes by spraying heated air on the dishes contained in the tub (20).

[0112] Meanwhile, in the case of a dishwasher using a desiccant drying device (80), the desiccant (810) may absorb moisture during the drying process and become wet with water. Therefore, to dry the wet desiccant (810), the dishwasher may perform a regeneration process in which heated air is sprayed onto the desiccant (810).

[0113] Washing and rinsing require heating of the wash water. Therefore, typical dishwashers are equipped with a heating device to heat the wash water during the washing and rinsing processes, and another heating device to heat the air during the drying and regeneration processes.

[0114] When a dishwasher is equipped with multiple, different heating devices, each of which occupies a certain volume, the volumetric efficiency of the dishwasher can deteriorate. Furthermore, the control logic in the control unit for controlling the different heating devices can become complex. This can also increase the manufacturing cost of the dishwasher.

[0115] Accordingly, the following specifically describes an embodiment of the present invention in which washing water and air can be heated alternately or simultaneously using the same heating device.

[0116] First, the desiccant (810) provided in the desiccant drying device (80) will be described. The desiccant (810) absorbs moisture contained in the air stream discharged from the tub (20) during the drying process using the desiccant drying device (80), and discharges the absorbed moisture into the air stream during the regeneration process.

[0117] That is, the desiccant (810) may be formed of a reversibly dehydratable material capable of absorbing moisture or releasing the absorbed moisture depending on the operating temperature range.

[0118] The applicable reversible hygroscopic material may be a composition comprising any one of aluminum oxide, silicon oxide, silica gel, alumina silica or zeolite, or a combination of two or more selected from these.

[0119] The desiccant (810) having an alumina-silica series material including aluminum oxide and silicon oxide may be applied to the desiccant drying device (80) according to the present invention. The present invention is not limited thereto, but will be described based on an example in which an alumina-silica series desiccant (810) is applied.

[0120] The desiccant (810) formed of an alumina silica series material in this way can be provided in the form of particles having a predetermined particle size so that the contact area with the air flow (F) can be secured to the maximum extent. In addition, compared to the desiccant (810) manufactured from pure aluminum oxide or silicon oxide material, the desiccant action can occur at a lower temperature range, and the regeneration action can occur at a lower temperature range.

[0121] However, the air flow is configured to pass through a plurality of absorbents (810) provided in the form of particles, and to absorb moisture by contacting the absorbents (810) or absorb moisture discharged from the absorbents (810).

[0122] Therefore, the desiccant (810) cannot help but act as a flow resistance to the air flow. To minimize this flow resistance, a gap can be effectively formed, and the particle size of the desiccant (810) can be selected to ensure optimal moisture absorption efficiency.

[0123] For this purpose, a desiccant (810) having a particle diameter in the range of 2 mm to 6 mm may be selected and applied, for example.

[0124] Below, the structure of a dishwasher according to each embodiment is described in detail. For clarity, the characteristic parts of each embodiment are schematically illustrated, and some parts of the dishwasher described above may be omitted from each drawing.

[0125] Fig. 3 is a schematic diagram of a dishwasher according to the first embodiment. Fig. 4 is an enlarged view showing a portion of Fig. 3.

[0126] A dishwasher according to one embodiment may include a tub (20), a moisture absorbing and drying device (80), a washing pump (45), and a blower (82).

[0127] The tub (20) forms a washing space (21) and can accommodate dishes, and a plurality of racks can be installed to accommodate dishes. The moisture absorption and drying device (80) can absorb moisture from the air discharged from the tub (20) and supply it to the tub (20).

[0128] The washing pump (45) can supply washing water to the tub (20). The washing pump (45) is connected to a switching valve (465), and the switching valve (465) can selectively or simultaneously supply washing water to each spray arm (61, 62) and the top nozzle (63). The washing water sprayed from the spray arm (61, 62) and the top nozzle (63) can be collected in the sump (41) and then fed back into the washing pump (45).

[0129] During the washing process or rinsing process, the washing pump (45) operates, and the washing water flows sequentially through the washing pump (45), the spray arm (61, 62) and / or the top nozzle (63), and the sump (41) to circulate and wash the dishes.

[0130] The blower (82) can supply air to the tub (20). During the drying process or the regeneration process, the blower (82) operates, and air can pass through the moisture absorption drying device (80) and be introduced into the tub (20) by the blower (82).

[0131] Additionally, the dishwasher according to one embodiment may include a duct (100) and a heating element (83).

[0132] The duct (100) is connected to the washing pump (45) and the blower (82), and washing water or air can flow selectively. The duct (100) forms a path through which washing water or air commonly flows, but the washing water and air do not mix and flow with each other.

[0133] A heating unit (83) may be placed in the duct (100) to heat washing water or air. The heating unit (83) may be provided, for example, using an electric resistance heating method. The heating unit (83) may be provided with a pair of terminals (831) at one end and the other end for supplying power. The pair of terminals (831) may pass through the duct (100) and extend toward the outside of the duct (100).

[0134] The heating unit (83) is positioned at a location where washing water and air commonly flow inside the duct (100), so that the washing water or air flowing through the duct (100) can be selectively heated.

[0135] The euro duct (100) may be connected to the washing pump (45) and the tub (20) to form a washing water flow path, and may be connected to the blower (82) and the moisture-absorbing drying device (80) to form an air flow path. To this end, the euro duct (100) may be provided with branch pipes each connected to the washing pump (45), the tub (20), the blower (82), and the moisture-absorbing drying device (80).

[0136] At this time, the washing water and air channels can be selectively opened and closed. To this end, valves for opening and closing these channels can be positioned at the inlet and outlet of each of the washing water and air channels. The valves are described in detail below.

[0137] In the duct (100), the washing water flow path and the air flow path can be formed to be common at the location where the heating unit (83) is placed. Accordingly, the washing water flow path, which is the path through which washing water flows, and the air flow path, which is the path through which air flows, can both commonly pass through the heating unit (83).

[0138] Due to this structure, the same heating unit (83) can heat the washing water when the washing water is flowing and can heat the air when the air is flowing. Therefore, using the same heating unit (83), the washing water can be heated during the washing process or the rinsing process, and the air can be heated during the drying process or the regeneration process.

[0139] Referring to FIG. 4, the euro duct (100) may include a washing water inlet (110), a washing water outlet (120), an air inlet (130), and an air outlet (140).

[0140] The washing water inlet (110) can be connected to the washing pump (45). Therefore, washing water can flow into the washing water inlet (110) from the washing pump (45). The washing water outlet (120) is connected to the tub (20), and washing water can be discharged into the tub (20) through the washing water outlet (120).

[0141] Washing water that flows into the duct (100) through the washing water inlet (110) can be heated while passing through the heating unit (83) and discharged into the tub (20) through the washing water discharge port (120). Specifically, the washing water discharge port (120) is connected to the switching valve (465), and the washing water can be sprayed from the spray unit (60) through the switching valve (465) and discharged into the tub (20).

[0142] For example, the dishwasher may be disposed in a tub (20) and may include a plurality of spray arms (61, 62) or top nozzles (63) for spraying washing water, and may also include a switching valve (465) for selectively opening and closing a plurality of supply channels connected to the spray arms (61, 62).

[0143] At this time, the washing water discharge port (120) can be connected to the switching valve (465). Therefore, the washing water discharged through the washing water discharge port (120) can be sprayed into the tub (20) through the spray arm (61, 62) or the top nozzle to wash the dishes contained in the tub (20).

[0144] The air inlet (130) is connected to the blower (82), and thus air can be introduced into the air inlet (130) from the blower (82). The air outlet (140) is connected to the tub (20), and thus air can be discharged to the tub (20) through the air outlet (140). Air introduced into the duct (100) through the air inlet (130) can be heated as it passes through the heating unit (83) and can be discharged to the tub (20) through the air outlet (140).

[0145] The air outlet (140) is connected to the desiccant drying device (80), and air passing through the air outlet (140) can pass through the desiccant (810) and be discharged to the tub (20). During the drying process, as the air passes through the desiccant (810), moisture contained in the air can be removed by the desiccant (810). Conversely, during the regeneration process, as the air passes through the desiccant (810), moisture contained in the desiccant (810) can be removed by the flowing air.

[0146] The euro duct (100) may include a washing water inlet control valve (101), a washing water discharge control valve (102), an air inlet control valve (103), and an air discharge control valve (104).

[0147] Valves placed in the euro duct (100) can selectively form an air flow path or a washing water flow path in the euro duct (100) by controlling the opening and closing of the inlet or outlet. The valves can be opened and closed by a control unit provided in the dishwasher.

[0148] The valves may be provided as solenoid valves, thermal actuator type valves, etc. for easy opening and closing operations, but are not limited thereto and may be provided as various types of valves whose operations can be controlled electrically or mechanically.

[0149] The washing water inlet control valve (101) is disposed at the washing water inlet (110) and can open and close the washing water inlet (110). The washing water discharge control valve (102) is disposed at the washing water outlet (120) and can open and close the washing water outlet (120). The air inlet control valve (103) is disposed at the air inlet (130) and can open and close the air inlet (130). The air discharge control valve (104) is disposed at the air outlet (140) and can open and close the air outlet (140).

[0150] Meanwhile, the desiccant drying device (80) may include a desiccant (810) and a housing (820). The desiccant (810) absorbs moisture contained in the air, the specific details of which are as described above. The housing (820) may accommodate the desiccant (810). One end of the housing (820) may be connected to an air outlet (140), and the other end may be connected to a tub (20).

[0151] The housing (820) may include a discharge port (821) and a control damper (822). The discharge port (821) is positioned downstream of the desiccant (810) and may discharge air into the tub (20).

[0152] The control damper (822) is arranged at the discharge port (821) and can open and close the discharge port (821). During the washing or rinsing process, washing water flows into the desiccant (810) through the discharge port (821), causing the desiccant (810) to become wet with water, which may deteriorate the performance of the desiccant (810) during the subsequent drying process.

[0153] In the embodiment, a control damper (822) is placed in the discharge port (821), and the control damper (822) closes the discharge port (821) during the washing process or rinsing process, thereby blocking the washing water from flowing into the desiccant (810) through the discharge port (821), thereby improving the performance of the desiccant (810).

[0154] Referring to Fig. 4, in the dishwasher according to the first embodiment, the moisture absorption and drying device (80) and the heating unit (83) may be arranged at the lower side of the tub (20). For example, in the first embodiment, a machine room (70) may be provided that is formed as a space at the lower side of the tub (20) and in which some of the components used in the operation of the dishwasher are arranged. In the first embodiment, the moisture absorption and drying device (80) and the heating unit (83) may be arranged in the machine room (70).

[0155] The dishwasher may include a first air pipe (210) formed to penetrate the lower plate (201) of the tub (20). An end of the first air pipe (210) may be arranged to protrude from the lower plate (201) of the tub (20). A second cap (211) may be provided at the end of the first air pipe (210).

[0156] The air inlet (130) is connected to the first air pipe (210), and the blower (82) can be placed in the first air pipe (210). During the drying process or regeneration process, the air in the tub (20) can be introduced into the duct (100) through the first air pipe (210) and the air inlet (130).

[0157] The dishwasher of the first embodiment can reduce the length and volume of the air pipe connecting the duct (100) and the tub (20) due to the structure described above. Accordingly, the structure of the duct (100) can be simplified, and the manufacturing cost of the dishwasher can be reduced.

[0158] Meanwhile, in the structures of the first and second embodiments in which the moisture absorbing and drying device (80) is placed on the lower side of the tub (20), a pipe connected to the discharge port (821) may be formed by penetrating the lower plate (201) of the tub (20). Due to this structure, when the washing process or rinsing process is performed, the washing water of the tub (20) may flow into the discharge port (821).

[0159] Of course, the washing water is blocked from flowing into the absorbent (810) through the discharge port (821) by the control damper (822), but it is necessary to ensure the washing water flow more reliably. Therefore, in the first and second embodiments, a first cap (823) may be provided at the end of the discharge port (821).

[0160] As illustrated in Fig. 4, the first cap (823) may be formed so that the upper end of the discharge port (821) is covered and the flow direction of the air is gently inclined toward the lower plate (201). With the first cap (823) having this structure, the washing water of the tub (20) can be prevented from flowing into the desiccant (810) through the discharge port (821).

[0161] In the first and second embodiments, the washing water flowing into the discharge port (821) is double-blocked by the first cap (823) and the control damper (822), so that the performance of the desiccant (810) can be improved.

[0162] Likewise, in the first embodiment, a second cap (211) is provided at the end of the first air pipe (210), and the second cap (211) may be provided with a structure similar to that of the first cap (823). By the second cap (211), the washing water can be effectively prevented from flowing into the duct (100) through the first air pipe (210) and the air inlet (130).

[0163] Fig. 5 is a schematic diagram of a dishwasher according to a second embodiment. Fig. 6 is an enlarged view showing a portion of Fig. 5. In the following, structures common to the first and second embodiments will not be described again.

[0164] A dishwasher according to the second embodiment may include a second air pipe (220) formed to penetrate the upper portion of the side plate (202) of the tub (20). The air inlet (130) may be connected to the second air pipe (220), and the blower (82) may be arranged in the second air pipe (220).

[0165] As illustrated in Fig. 5, the air inlet location connected to the tub (20) in the second air pipe (220) may be, for example, between the top rack (53) and the upper rack (52). However, the present invention is not limited thereto.

[0166] Accordingly, the blower (82) may be placed outside the side of the tub (20) rather than in the machine room (70). According to the structure of the second embodiment, the inlet and outlet of the tub (20) for air passing through the duct (100) may be spaced apart from each other considerably further than in the first embodiment.

[0167] According to this structure, the heated air introduced into the tub (20) can be uniformly distributed throughout the interior of the tub (20) since the outlet is quite far away, efficiently drying the dishes contained in the tub (20) and then being discharged from the tub (20). Therefore, in the dishwasher of the second embodiment, the drying performance of the dishwasher can be improved during the drying process.

[0168] Hereinafter, the flow of air or washing water in each process in the dishwashers of the first and second embodiments will be specifically described. Since the flow of air or washing water in the duct (100) in the first and second embodiments is the same, the description will be made using a drawing based on the first embodiment.

[0169] Fig. 7 is a drawing for explaining a case where air flows in a duct (100) in a dishwasher according to the first embodiment based on Fig. 4. In the drawings below, the flow of air in the air path is indicated by a hidden line arrow, and the flow of washing water in the washing water path is indicated by a solid line arrow.

[0170] As shown in Fig. 7, when air flows in the euro duct (100), the air inlet control valve (103) and the air discharge control valve (104) can be opened and the washing water inlet control valve (101) and the washing water discharge control valve (102) can be closed.

[0171] That is, when the dishwasher is performing the drying process of dishes or the regeneration process of the moisture absorption drying device (80), the air inlet control valve (103) and the air discharge control valve (104) may be opened and the washing water inlet control valve (101) and the washing water discharge control valve (102) may be closed.

[0172] The control damper (822) can open the discharge port (821) when air flows in the euro duct (100). That is, the control damper (822) can open the discharge port (821) when the dishwasher is performing the drying process of dishes or the regeneration process of the moisture absorption drying device (80).

[0173] During the drying or regeneration process, the blower (82) may operate and the washing pump (45) may not operate. Accordingly, air in the tub (20) may be introduced into the air inlet (130) of the duct (100), and the air inlet control valve (103) may be opened so that the air may pass through the heating unit (83) and be heated.

[0174] Air is discharged through the air outlet (140), and the air discharge control valve (104) is opened so that the heated air can pass through the desiccant (810). In addition, the control damper (822) is opened so that the heated air can be finally discharged into the tub (20).

[0175] At this time, the washing water inflow control valve (101) and the washing water discharge control valve (102) are closed, so washing water may not flow in the duct (100).

[0176] FIG. 8 is a drawing for explaining a case where washing water flows in a duct (100) in a dishwasher according to the first embodiment based on FIG. 4.

[0177] As shown in Fig. 8, when washing water flows in the euro duct (100), the washing water inlet control valve (101) and the washing water discharge control valve (102) can be opened and the air inlet control valve (103) and the air discharge control valve (104) can be closed.

[0178] That is, when the dishwasher is performing a dishwashing or rinsing process, the washing water inlet control valve (101) and the washing water discharge control valve (102) may be opened and the air inlet control valve (103) and the air discharge control valve (104) may be closed.

[0179] The control damper (822) can close the discharge port (821) when washing water flows in the euro duct (100). That is, the control damper (822) can close the discharge port (821) when the dishwasher is performing a dishwashing process or a rinsing process.

[0180] During the washing or rinsing process, the washing pump (45) may operate and the blower (82) may not operate. The washing water stored in the sump (41) may flow into the washing water inlet (110) of the duct (100), and when the washing water inlet control valve (101) is opened, the washing water may pass through the heating unit (83) and be heated.

[0181] Washing water is discharged through the washing water discharge port (120), and the washing water is selectively or simultaneously sprayed to each spray arm (61, 62) or top nozzle by the switching valve (465) to wash or rinse dishes contained in the tub (20).

[0182] At this time, the air intake control valve (103), the air exhaust control valve (104), and the control damper (822) are closed, so air may not flow in the duct (100).

[0183] In the embodiment, since the same heating element (83) is used to selectively heat the washing water or air according to each process of the dishwasher, the volumetric efficiency of the dishwasher can be increased, the structure can be simplified, and the manufacturing cost can be effectively reduced compared to a case where different heating devices are used to heat the washing water and air, respectively.

[0184] Fig. 9 is a schematic diagram of a dishwasher according to a third embodiment. Fig. 10 is an enlarged view showing part 10 of Fig. 9. In the following, structures already described in the first and second embodiments will not be repetitively described.

[0185] In the dishwasher according to the third embodiment, the moisture absorption and drying device (80) and the heating unit (83) can be placed on the inner edge of the tub (20). The duct (100) equipped with the moisture absorption and drying device (80) and the heating unit (83) can be placed inside the tub (20).

[0186] According to this structure, the moisture absorption drying device (80) is placed close to the upper rack (52) and the lower rack (51), so that very dry and high-temperature air discharged from the moisture absorption drying device (80) during the drying process can effectively dry the dishes stored in the upper rack (52) and the lower rack (51).

[0187] The dishwasher may include a lower rack (51) placed in the washing space (21) and on which dishes are placed, and an upper rack (52) placed above the lower rack (51) in the washing space (21) and on which dishes are placed.

[0188] According to the third embodiment, the moisture absorbing drying device (80) can be placed between the lower rack (51) and the upper rack (52). Accordingly, the discharge port (821) of the moisture absorbing drying device (80) can be placed at a position close to the lower rack (51) and the upper rack (52) and between the lower rack (51) and the upper rack (52).

[0189] Due to this structure, when the drying process is in progress, the very dry and high temperature air discharged from the discharge port (821) is discharged to a position close to and between the lower rack (51) and the upper rack (52) where most of the dishes are stored, and can dry the dishes while passing through the lower rack (51) and the upper rack (52).

[0190] That is, since the distance of air flow from the outlet (821) to the lower rack (51) and the upper rack (52) is very short, the air does not cool well and the dishes are dried without moisture being mixed well, so the drying efficiency of the dishwasher can be improved.

[0191] A dishwasher according to a third embodiment may include a third air pipe (230) formed to penetrate a side plate (202) of a tub (20). Most of the third air pipe (230) may be disposed outside the tub (20). The air inlet (130) is connected to the outlet of the third air pipe (230), and the blower (82) may be disposed in the third air pipe (230). Accordingly, the blower (82) may be disposed outside the side of the tub (20).

[0192] At this time, the inlet (231) of the third air pipe (230) may be arranged on the upper side of the upper rack (52). For example, the inlet (231) of the third air pipe (230) may be arranged between the top rack (53) and the upper rack (52). If the inlet (231) of the third air pipe (230) and the discharge port (821) are at the same or similar positions in the vertical direction of the dishwasher, at least a portion of the air discharged from the discharge port (821) may not be uniformly spread throughout the tub (20) but may flow directly into the inlet (231) of the third air pipe (230), which may lower the drying efficiency during the drying process.

[0193] Therefore, it is necessary to arrange the discharge port (821) of the desiccant drying device (80) and the inlet (231) of the third air pipe (230) so as to be spaced apart from each other in the vertical direction of the dishwasher. For example, as illustrated in FIG. 10, the discharge port (821) of the desiccant drying device (80) may be arranged between the upper rack (52) and the lower rack (51), and the inlet (231) of the third air pipe (230) may be arranged on the upper side of the upper rack (52).

[0194] Due to this structure, most of the air discharged from the discharge port (821) can pass through the upper rack (52) and dry the dishes before being introduced into the third air pipe (230). Due to this structure, the drying efficiency of the dishwasher can be improved during the drying process.

[0195] Fig. 11 is a drawing for explaining a case where air flows in a duct (100) in a dishwasher according to a third embodiment based on Fig. 10. Fig. 12 is a drawing for explaining a case where washing water flows in a duct (100) in a dishwasher according to a third embodiment based on Fig. 10. Since this is similar to the cases described above in the first and second embodiments, it will be briefly described below.

[0196] Referring to FIGS. 11 and 12, when washing water flows in the euro duct (100), the washing water inlet control valve (101) and the washing water discharge control valve (102) can be opened, and the air inlet control valve (103) and the air discharge control valve (104) can be closed.

[0197] Additionally, when air flows in the euro duct (100), the air inlet control valve (103) and the air discharge control valve (104) can be opened and the washing water inlet control valve (101) and the washing water discharge control valve (102) can be closed.

[0198] In other words, when the dishwasher is performing a dishwashing or rinsing process, the washing water inlet control valve (101) and the washing water discharge control valve (102) may be opened and the air inlet control valve (103) and the air discharge control valve (104) may be closed.

[0199] In addition, when the dishwasher is performing the drying process of dishes or the regeneration process of the moisture absorbing dryer (80), the air inlet control valve (103) and the air discharge control valve (104) may be opened and the washing water inlet control valve (101) and the washing water discharge control valve (102) may be closed.

[0200] Meanwhile, the control damper (822) can close the discharge port (821) when washing water flows in the euro duct (100), and open the discharge port (821) when air flows in the euro duct (100).

[0201] That is, the control damper (822) can close the discharge port (821) when the dishwasher is performing a dishwashing process or a rinsing process, and can open the discharge port (821) when the dishwasher is performing a dish drying process or a regeneration process of the moisture absorption and drying device (80).

[0202] In an embodiment, the heating unit (83) may heat the washing water simultaneously with the air while the regeneration process is in progress. For example, the washing process may be performed immediately after the regeneration process.

[0203] In this case, the sump (41) and the lower part of the tub (20) can be filled with washing water before the regeneration process begins. After the washing water is filled, the regeneration process can be performed to circulate air between the tub (20) and the duct (100).

[0204] During this regeneration process, the heated air passing through the duct (100) can heat the washing water stored in the sump (41) and the tub (20). That is, the washing water can be heated by heat transfer between the air and the washing water. This heat transfer can actively occur at the boundary where the heated air and the washing water come into contact with each other. That is, during the regeneration process, the heating unit (83) can be used to simultaneously heat the air and the washing water.

[0205] Additionally, heat transfer between air and wash water can occur through the flow duct (100) and valves. This is because the flow duct (100) and valves can be positioned at the boundary between air and wash water. Therefore, to increase heat transfer between air and wash water, the flow duct (100) and valves can be manufactured from a material with high thermal conductivity, such as stainless steel or aluminum.

[0206] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed in this specification, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. A tub that forms a washing space and accommodates dishes; A moisture absorption drying device that absorbs moisture from the air discharged from the above tub and supplies it to the above tub; A washing pump that supplies washing water to the above tub; A blower for supplying air to the above-mentioned tub; A duct connected to the washing pump and the blower, through which washing water or air selectively flows; and A heating unit placed in the above-mentioned duct to heat washing water or air including, Dishwasher.

2. In paragraph 1, The above Euroduct is, Connected to the above washing pump and the above tub to form a washing water passage, Connected to the above blower and the above moisture-absorbing drying device to form an air path, The above washing water path and the above air path are selectively opened and closed, Dishwasher.

3. In paragraph 2, The above washing water flow path and the above air flow path are formed to be common at the area where the heating unit is placed. Dishwasher.

4. In paragraph 1, The above Euroduct is, A washing water inlet through which washing water flows in from the above washing pump; A washing water discharge port through which washing water is discharged from the above tub; An air inlet through which air is drawn in from the above blower; and Air outlet through which air is discharged to the above-mentioned tub including, Dishwasher.

5. In paragraph 4, The above Euroduct is, A washing water inlet control valve that opens and closes the washing water inlet; A washing water discharge control valve that opens and closes the washing water discharge port; An air inlet control valve that opens and closes the air inlet; and Air exhaust control valve that opens and closes the above air exhaust port including, Dishwasher.

6. In paragraph 5, When washing water flows in the above-mentioned euro duct, the washing water inlet control valve and the washing water discharge control valve are opened and the air inlet control valve and the air discharge control valve are closed. When air flows in the above duct, the air inlet control valve and the air discharge control valve are opened and the washing water inlet control valve and the washing water discharge control valve are closed. Dishwasher.

7. In paragraph 5, When the dishwasher is performing a dishwashing or rinsing process, the washing water inlet control valve and the washing water discharge control valve are opened and the air inlet control valve and the air discharge control valve are closed. When the dishwasher is performing the drying process of dishes or the regeneration process of the moisture absorption drying device, the air inlet control valve and the air discharge control valve are opened and the washing water inlet control valve and the washing water discharge control valve are closed. Dishwasher.

8. In paragraph 4, The above moisture absorbing and drying device, A desiccant that absorbs moisture contained in the air; and Housing for accommodating the above-mentioned desiccant Including, The above housing, An outlet disposed downstream of the above-mentioned absorbent and discharging air into the tub; and Control damper that opens and closes the above discharge port Including, The above control damper closes the discharge port when washing water flows in the euro duct, and opens the discharge port when air flows in the euro duct. Dishwasher.

9. In paragraph 8, The above control damper, When the dishwasher is performing the dishwashing or rinsing process, the outlet is closed, When the dishwasher is performing the drying process of the dishes or the regeneration process of the moisture absorption drying device, the outlet is opened. Dishwasher.

10. In paragraph 4, A plurality of spray arms arranged in the above tub and spraying washing water; and A switching valve that selectively opens and closes multiple supply paths connected to the above-mentioned injection rock Including, The above washing water discharge port is connected to the above switching valve, Dishwasher.

11. In paragraph 4, The above moisture absorption drying device and the heating unit are placed on the lower side of the tub. Dishwasher.

12. In paragraph 11, It includes a first air pipe formed to penetrate the lower plate of the above tub, The above air inlet is connected to the first air pipe, The above blower is arranged in the first air pipe, Dishwasher.

13. In paragraph 11, It includes a second air pipe formed to penetrate the upper part of the side plate of the above tub, The above air inlet is connected to the second air pipe, The above blower is arranged in the second air pipe, Dishwasher.

14. In paragraph 4, The above moisture absorption drying device and the heating unit are arranged at the inner edge of the tub. Dishwasher.

15. In paragraph 14, A lower rack placed in the above washing space and on which dishes are placed; and An upper rack placed on the upper side of the lower rack in the above washing space, on which dishes are placed. Including, The above-mentioned moisture-absorbing drying device is placed between the lower rack and the upper rack. Dishwasher.

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