Dishwasher and control method therefor

Abstract

The present disclosure relates to a dishwasher. According to an embodiment of the present disclosure, the dishwasher comprises: a tub forming a washing space for accommodating dishes; a door for opening and closing the washing space; a tub heater disposed on one side of the tub and heating the air in the washing space; and a moisture absorption drying module disposed on one side of the tub and drying the washing space. In a drying cycle of drying the dishes disposed in the washing space, the door is opened after the moisture absorption drying module and the tub heater are operated.

Description

Dishwasher and control method thereof

[0001] The present disclosure relates to a dishwasher and a method for controlling the same, and more specifically, to a dishwasher including a heater and a method for controlling the same.

[0002] A dishwasher is a home appliance that sprays washing water to remove dirt, such as food residue, stuck to dishes, plates, and cutlery, such as spoons, chopsticks, and forks, and washes dishes and cutlery (hereinafter referred to as "dish to be washed").

[0003] Dishwashers sometimes heat the wash water during the rinse cycle. This improves the dishwasher's cleaning performance and reduces bacteria and microorganisms remaining on the surface of dishes. Additionally, it raises the temperature of the dish surface during the rinsing process, thereby improving drying efficiency.

[0004] Meanwhile, dishwashers enhance user convenience by performing a drying process after washing, and also play a role in preventing the growth of microorganisms on dishes. There are various drying methods available for dishwashers, such as hot air drying and moisture-wicking drying.

[0005] Conventionally, external heaters were placed inside the dishwasher tub to heat the wash water or dry the dishes. However, external heaters suffered from reduced durability and high power consumption due to repeated operation at high temperatures for extended periods.

[0006] In addition, to prevent the heater from overheating, the power to the heater had to be turned on and off at regular intervals, and during this process, there was a problem where the efficiency of washing and drying decreased and the total operating time of the dishwasher increased.

[0007] The technical problem of the present disclosure is to provide a dishwasher and a control method thereof that can solve the various problems of the aforementioned prior art.

[0008] Another objective of the present disclosure is to provide a dishwasher that includes a heater while reducing power consumption and shortening the total operating time.

[0009] Another objective of the present disclosure is to provide a dishwasher with improved drying efficiency.

[0010] Another objective of the present disclosure is to provide a dishwasher that reduces the energy required for the regeneration of a desiccant.

[0011] Another objective of the present disclosure is to provide a dishwasher in which the moisture absorption capacity of the absorbent is not reduced.

[0012] Another objective of the present disclosure is to provide a dishwasher that prevents overheating of the heater and shortens the total operating time.

[0013] Another objective of the present disclosure is to provide a control method for a dishwasher in which drying of dishes or a washing space is performed quickly.

[0014] The problems of the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below.

[0015] To solve the above problem, a dishwasher according to an embodiment of the present disclosure comprises: a tub forming a washing space for accommodating dishes; a door for opening and closing the washing space; a tub heater disposed on one side of the tub and heating the air of the washing space; and a moisture-absorbing drying module disposed on one side of the tub and drying the washing space.

[0016] The above dishwasher opens the door after operating the moisture-absorbing drying module and the tub heater during the drying process of drying dishes placed in the washing space.

[0017] The above dishwasher can stop the moisture absorption drying module after operating it for a certain period of time and stop the tub heater after operating it for a certain period of time before opening the door.

[0018] The above dishwasher can operate the moisture absorption drying module for a certain period of time after opening the door.

[0019] The operating time of the above tub heater may be within 3 minutes.

[0020] The temperature of the washing space heated by the above tub heater may be lower than the regeneration temperature of the absorbent of the above moisture-absorbing drying module.

[0021] The above dishwasher may further include a wash water heater that heats the wash water supplied to the wash space.

[0022] The above dishwasher may stop the washing water heater after operating it for a certain period of time during the main cycle of washing dishes placed in the washing space, and proceed with the drying cycle after the main cycle.

[0023] The above tub heater may be spaced upward at a certain distance from the bottom surface of the tub.

[0024] The above tub heater can be positioned above the level of the washing water inside the tub during the drying process.

[0025] The dishwasher above can drain the washing water during the drying cycle so that the water level of the washing water in the tub is located below the tub heater.

[0026] The above tub heater can be partially submerged in washing water to heat the washing water during the main process of washing dishes placed in the washing space.

[0027] The above tub heater may stop after operating for a certain period of time in the above main stroke and may stop after operating for a certain period of time in the above drying stroke.

[0028] To solve the above problem, a control method for a dishwasher according to an embodiment of the present disclosure includes a step of operating a moisture-absorbing drying module to first dry the washing space inside a tub where dishes are placed.

[0029] The control method of the dishwasher described above includes the step of operating a tub heater disposed on one side of the tub to dry the washing space a second time; and the step of opening a door that opens and closes the tub to dry the washing space a third time.

[0030] The control method of the dishwasher described above may further include the step of operating the moisture absorption drying module to dry the washing space a fourth time after the step of opening the door.

[0031] The control method of the dishwasher described above may further include the step of heating the washing water for washing dishes placed in the washing space with the tub heater prior to the step of drying the washing space first.

[0032] The control method of the dishwasher described above may further include the step of draining the washing water so that the water level of the washing water in the tub is located below the tub heater.

[0033] The control method of the dishwasher described above may further include a step of heating the washing water supplied to the washing space with a washing water heater prior to the step of drying the washing space first.

[0034] Specific details of other embodiments are included in the detailed description and drawings.

[0035] According to the dishwasher of the present disclosure, one or more of the following effects are provided.

[0036] After operating the moisture absorption drying module and tub heater during the drying cycle, the door is opened, allowing drying to proceed quickly, which can reduce the dishwasher's power consumption and shorten the total operating time.

[0037] Drying efficiency can be improved by stopping the moisture absorption drying module after operating for a certain period of time and stopping the tub heater after operating for a certain period of time.

[0038] By operating the moisture absorption drying module for a certain period after opening the door, moisture inside the dishwasher can be discharged to the outside, and the energy required for regenerating the desiccant can be reduced.

[0039] The temperature of the washing space heated by the tub heater is lower than the regeneration temperature of the desiccant, so the moisture absorption capacity of the desiccant may not decrease.

[0040] By using a wash water heater that operates independently of the tub heater and heats the wash water supplied to the wash space, overheating of the heater can be prevented and the total operating time of the dishwasher can be shortened.

[0041] By using a control method in which a moisture-absorbing drying module is operated to dry the washing space first, a tub heater is operated to dry the washing space second, and a door is opened to dry the washing space third, the drying of dishes or the washing space can be carried out quickly.

[0042] The effects of the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims.

[0043] FIG. 1 is a perspective view of a dishwasher according to one embodiment of the present disclosure.

[0044] FIG. 2 is a schematic diagram of the interior of a dishwasher according to one embodiment of the present disclosure, viewed from the side.

[0045] FIG. 3 is a perspective view showing the interior of a dishwasher according to one embodiment of the present disclosure.

[0046] FIG. 4 is a drawing showing a tub heater and a moisture absorption drying module of a dishwasher according to one embodiment of the present disclosure.

[0047] FIG. 5 is a diagram showing air flow when the drying process of a dishwasher according to one embodiment of the present disclosure is in progress.

[0048] Figure 6 is a drawing showing the door of Figure 5 in an open state.

[0049] FIG. 7 is a block diagram briefly illustrating the configuration of a dishwasher according to one embodiment of the present disclosure.

[0050] FIG. 8 is a flowchart showing the process of a dishwasher according to one embodiment of the present disclosure.

[0051] FIG. 9 is a flowchart illustrating a control method for a dishwasher according to one embodiment of the present disclosure.

[0052] FIG. 10 is a flowchart illustrating a control method for a dishwasher according to another embodiment of the present disclosure.

[0053] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components regardless of drawing symbols are given the same reference number, and redundant descriptions thereof will be omitted.

[0054] The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification, and do not inherently possess distinct meanings or roles.

[0055] In addition, when describing the embodiments disclosed in this specification, if it is determined that a detailed description of related prior art may obscure the essence of the embodiments disclosed in this specification, such detailed description is omitted. Furthermore, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that they include all modifications, equivalents, and substitutions that fall within the concept and technical scope of this disclosure.

[0056] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0057] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0058] A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0059] In this application, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0060] The directional indications of Up (U), Down (D), Front (F), Back (R), Left (Le), and Right (Ri) shown in the drawings are for convenience of explanation only and do not limit the technical concepts disclosed in this specification.

[0061] Referring to FIG. 1, the external appearance of a dishwasher (1) according to one embodiment of the present disclosure can be seen.

[0062] The dishwasher (1) may include a case (10) that forms the exterior. For example, the case (10) may have a rectangular shape. As a result, the dishwasher (1) can be efficiently placed in various spaces, such as under a desk, under a sink, or in a utility room.

[0063] The case (10) can form a space inside. A tub (20, see FIG. 2) can be installed inside the case (10).

[0064] The door (30) can be positioned at the front of the case (10). The door (30) can open and close the interior space of the case (10) from the front.

[0065] On the outer side of the door (30), a handle (31) for opening the door (30) and a control panel (32) for controlling the dishwasher (1) may be provided.

[0066] The display (33) can be placed on the control panel (32). The display (33) can visually display information regarding the current operating status of the dishwasher (1), etc.

[0067] The button section (34) may be placed on the control panel (32). The button section (34) may include a selection button for inputting a user's course selection operation, a power button for inputting to control the power of the dishwasher (1), etc.

[0068] Referring to FIG. 2, the interior of a dishwasher (1) according to one embodiment of the present disclosure can be seen.

[0069] The dishwasher (1) includes a tub (20). The tub (20) may be formed in a box shape with an open front. The tub (20) may be referred to as a washing tank.

[0070] The tub (20) can be formed from a metal plate that is resistant to high temperature and moisture. For example, the tub (20) can be formed from a plate made of a stainless steel material through press processing.

[0071] A washing space (21) may be formed inside the tub (20). The tub (20) may accommodate items to be washed, such as bowls, cutlery, and other cooking utensils, in the washing space (21). Unless otherwise noted, items to be washed will be referred to as tableware.

[0072] A storage unit (50) may be placed in the washing space (21). The storage unit (50) may include a first rack (51), a second rack (52), and a top rack (53). The storage unit (50) may be detachably placed in the washing space (21) inside the tub (20). Tableware may be placed in or accommodated in the storage unit (50).

[0073] The dishwasher (1) may include a spray unit (60). The spray unit (60) may include a first spray arm (61), a second spray arm (62), and a top nozzle (63). The spray unit (60) may be installed adjacent to the storage unit (50). The spray unit (60) may spray washing water for washing dishes.

[0074] A drive unit (40) for supplying, collecting, circulating, and draining washing water for washing dishes may be placed below the tub (20).

[0075] The driving unit (40) may 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 to the sump (41) from an external water source, a drainage unit (44) for discharging washing water from the sump (41) to the outside, a washing pump (45) for supplying washing water to the sump (41), and a supply path (46).

[0076] The sump cover (42) may be positioned above the sump (41). The sump cover (42) may be provided with a plurality of recovery holes (not shown) for recovering the washing water sprayed into the washing space (21) into the sump (41).

[0077] That is, the washing water that was sprayed toward the dishes in the washing space (21) or washed the dishes falls to the bottom of the washing space (21) and can be recovered back into the sump (41) through the sump cover (42).

[0078] The water supply unit (43) can supply washing water from an external water source to the washing space (21) of the tub (20). The water introduced from the external water source flows sequentially through the sump (41), washing pump (45), and supply channel (46) and can be used for washing and rinsing in the washing space (21) of the tub (20).

[0079] A washing pump (45) may be positioned on one side of the sump (41). The washing pump (45) may pressurize washing water and supply it to the spray unit (60). One end of the washing pump (45) may be connected to the sump (41). The other end of the washing pump (45) may be connected to the supply channel (46).

[0080] The washing pump (45) may include an impeller (451), a pump motor (453), a washing water heater (454), etc. As a result, when power is supplied to the pump motor (453), the impeller (451) rotates, and the washing water in the sump (41) is pressurized and then supplied to the spraying section (60) through the supply path (46).

[0081] The washing water heater (454) can heat the washing water. The washing water heater (454) can generate heat when power is supplied. Therefore, the washing water passing through the washing pump (45) can be supplied to the spraying section (60) via the supply path (46) in a state heated by the washing water heater (454).

[0082] Meanwhile, the supply channel (46) can selectively supply washing water supplied from the washing pump (45) to the spraying unit (60).

[0083] For example, the supply channel (46) may be connected to the first injection arm (61), the second injection arm (62), and the top nozzle (63), and may include a switching valve (465) that selectively opens and closes the flow of cleaning water to the first injection arm (61), the second injection arm (62), and the top nozzle (63).

[0084] Depending on the control of the switching valve (465), cleaning water may be sprayed sequentially or simultaneously from the first spray arm (61), the second spray arm (62), and the top nozzle (63).

[0085] Meanwhile, the spray unit (60) can spray washing water toward the tableware placed in the storage unit (50).

[0086] For example, the first spray arm (61) can spray washing water onto dishes placed on the first rack (51). The second spray arm (62) can spray washing water onto the first rack (51) or onto the second rack (52) placed above the first rack (51). The top nozzle (63) can spray washing water onto the second rack (52) or onto the top rack (53) placed above the second rack (52).

[0087] The first spray arm (61) and the second spray arm (62) can be rotatably positioned in the washing space (21) of the tub (20). As a result, the first spray arm (61) and the second spray arm (62) can rotate and spray washing water toward the dishes in the storage unit (50).

[0088] For example, the first spray arm (61) can rotate at the bottom of the first rack (51) and spray cleaning water toward the first rack (51). The second spray arm (62) can rotate between the first rack (51) and the second rack (52) and spray cleaning water.

[0089] The first rack (51), the second rack (52), and the top rack (53) can be withdrawn from the washing space (21) through the open front of the tub (20).

[0090] In this drawing, a first rack (51) located at the bottom of the tub (20) and capable of accommodating relatively large tableware, a second rack (52) placed on top of the first rack (51) and capable of storing medium-sized tableware, and a top rack (53) located at the top of the tub (20) and capable of storing small tableware are shown.

[0091] The present invention is not limited thereto, but is described based on an embodiment of a dishwasher (1) equipped with three storage compartments (50) as illustrated.

[0092] Guide rails (not shown) may be provided on both side walls of the tub (20) so that the first rack (51), the second rack (52), and the top rack (53) can be pulled out through the open front of the tub (20). For example, the guide rails may include a first rail, a second rail, and a top rail.

[0093] Meanwhile, the door (30) can open and close the open front of the tub (20). A hinge portion (not shown) may be provided at the bottom of the door (30). As a result, the door (30) can be opened by rotating with the hinge portion as a rotation axis.

[0094] A detergent supply device (not shown) for supplying detergent into the interior of the tub (20) may be further provided on the inner side of the door (30).

[0095] Meanwhile, the tub (20) may include a bottom surface (25), a rear surface (28), a top surface (29), a first side surface (26, see FIG. 3), and a second side surface (not shown). The washing space (21) may be formed by being surrounded by the bottom surface (25), the rear surface (28), the top surface (29), the first side surface (26), and the second side surface (27), etc.

[0096] The bottom surface (25) can be positioned above the sump cover (42). The bottom surface (25) can be positioned at an angle toward the sump cover (42). Thus, the wash water falling onto the bottom surface (25) can be guided toward the sump (41).

[0097] The rear surface (28) may be a surface facing the door (30) when the door (30) seals the washing space (21). The rear surface (28) may be positioned vertically. As a result, the washing water in the washing space (21) can flow along the rear surface (28) to the bottom surface (25).

[0098] The upper surface (29) can form the ceiling of the tub (20). The upper surface (29) can face the bottom surface (25). A top nozzle (63) can be positioned on one side of the upper surface (29).

[0099] The tub heater (24) may be spaced upward at a certain distance from the bottom surface (25). The tub heater (24) may generate heat as power is supplied. The tub heater (24) may heat the washing water or heat the air in the washing space (21).

[0100] For example, during the washing cycle (S2) or rinsing cycle (S3, S4) of the dishwasher (1), the washing water may rise to the level of the bottom surface. At this time, at least a portion of the tub heater (24) may be submerged in the washing water. When power is supplied to the tub heater (24), the tub heater (24) can heat the washing water, and the heated washing water can be used for washing or rinsing dishes. As a result, the washing ability of the dishes is improved, and drying of the dishes can be promoted during the drying cycle.

[0101] As another example, during the drying cycle of the dishwasher (1), the washing water is drained and the water level may be lower than that of the tub heater (24). At this time, when power is supplied to the tub heater (24), the tub heater (24) can heat the air in the washing space (21), and as a result, the drying of the dishes can occur smoothly.

[0102] In this way, the tub heater (24) can replace the wash water heater (454). By using a single tub heater (24) for heating the wash water and the air in the wash space (21), the material cost of the wash water heater (454) can be reduced, and the space of the machine room (22) can be secured more widely.

[0103] Meanwhile, unlike the above, the wash water heater (454) may be used to heat the wash water, and the tub heater (24) may be used only to heat the air in the wash space. In this case, since the roles of each heater (24, 454) are distinguished, the tub heater (24) does not need to be continuously heated for heating the wash water and heating the air in the wash space (21).

[0104] Therefore, since there is no need to wait for the heater (24, 454) to cool down to prevent overheating, the washing water can be heated through the washing water heater (454) to perform rinsing, and then the air inside the washing space (21) can be heated immediately through the tub heater (24) to perform drying. As a result, the durability of the heater (24, 454) can be improved, and the total operating time of the dishwasher (1) can be shortened.

[0105] The dishwasher (1) may include a machine room (22). The machine room (22) may be formed between the tub (20) and the case (10). The machine room (22) may be located below the tub (20). The machine room (22) may be a space where a sump (41), a wash pump (45), piping, and other parts are placed.

[0106] The dishwasher (1) includes a moisture-absorbing drying module (80). The moisture-absorbing drying module (80) can be placed in the machine room (22).

[0107] The moisture-absorbing drying module (80) can dry the washing space (21) or dishes. The moisture-absorbing drying module (80) can repeat moisture absorption and regeneration by absorbing moisture from the washing space (21) or by discharging the absorbed moisture to the washing space (21). This is explained in detail in FIG. 4.

[0108] The intake port (81) may be a hole through which air within the washing space (21) flows into the moisture-absorbing drying module (80). The intake port (81) may be formed on the side of the tub (20). For example, as shown in the drawing, the intake port (81) may be formed on the rear side (28) of the tub (20). Meanwhile, unlike the drawing, the intake port (81) may be formed at various locations on the tub (20).

[0109] The intake port (81) may be formed on the second spray arm (62). The intake port (81) may be formed on the second rack (52). In this case, the moisture-absorbing drying module (80) can draw in relatively hot and humid air within the washing space (21).

[0110] Accordingly, when the suction port (81) is formed above the second injection arm (62) or above the second rack (52), the moisture-absorbing drying module (80) can absorb a larger amount of moisture than when the suction port (81) is formed in other locations.

[0111] Meanwhile, the intake port (81) may be formed between the second rack (52) and the top rack (53). In this case, the air flowing into the intake port (81) may not interfere with the tableware placed on the second rack (52) or the top rack (53).

[0112] Accordingly, the flow rate of air passing through the moisture-absorbing drying module (80) can be increased, and the amount of moisture absorbed through the moisture-absorbing drying module (80) can be increased.

[0113] The suction channel (88) may be a passage through which air introduced into the suction port (81) flows to the moisture-absorbing drying module (80). The suction channel (88) may connect the suction port (81) and the moisture-absorbing drying module (80). Air from the washing space (21) introduced into the suction port (81) may flow to the moisture-absorbing drying module (80) inside the machine room (22) through the suction channel (88).

[0114] Meanwhile, in this drawing, the suction channel (88) is depicted as being positioned at the rear of the tub (20) or case (10), but this is for convenience of illustration, and the suction channel (88) is positioned in the space between the tub (20) and the case (10).

[0115] The discharge port (82) may be a hole through which air passing through the moisture-absorbing drying module (80) is discharged into the washing space (21). The discharge port (82) may be formed adjacent to the bottom surface (25) of the tub (20). The discharge port (82) may be formed below the first spray arm (61) or the first rack (51).

[0116] In this case, the high-temperature air dried by passing through the moisture-absorbing drying module (80) rises upward and can promote the circulation of air within the washing space (21) and the drying of dishes.

[0117] Referring to FIG. 3, the interior of a dishwasher (1) according to one embodiment of the present disclosure can be seen.

[0118] The tub (20) may include a first side (26) and a second side (not shown). The first side (26) and the second side may be arranged vertically. The first side (26) and the second side may face each other. For example, the first side (26) may form the right side of the tub (20), and the second side may form the left side of the tub (20).

[0119] Meanwhile, in this drawing, the door, the second side, and the top surface have been omitted to facilitate easy verification of the tub heater arrangement.

[0120] The tub heater (24) may have a circular shape. The tub heater (24) may be positioned to surround the sump (41) or the sump cover (42). As described above, the bottom surface (25) may be positioned at an angle toward the sump cover (42), so the tub heater (24) can be easily submerged in the wash water, and the wash water can be heated efficiently as the contact area with the wash water increases.

[0121] Meanwhile, the tub heater (24) may be formed in various shapes other than those shown in the drawing. Additionally, the tub heater (24) may be placed at various locations within the tub (20). For example, if the tub heater (24) is used to heat only the air within the washing space without heating the washing water, the tub heater (24) may be placed at various locations on the side of the tub (20) rather than adjacent to the bottom surface.

[0122] The dishwasher may include a discharge cap (86). The discharge cap (86) may form a discharge port (82, see FIG. 2) of a moisture-absorbing drying module (80, see FIG. 2). The discharge cap (86) may be positioned on one side of the bottom surface (25). The discharge port (82) may be formed at the bottom of the discharge cap (86). Thus, the discharge cap (86) can prevent washing water or foreign matter from entering through the discharge port (82).

[0123] Referring to FIG. 4, a tub heater (24) and a moisture absorption drying module (80) of a dishwasher according to one embodiment of the present disclosure can be seen.

[0124] The moisture-absorbing drying module (80) may include a blower fan (83), a regenerative heater (84), and a moisture absorbent (85).

[0125] The blower fan (83) can circulate air. The blower fan (83) can be positioned on one side of the suction path (88). Depending on the operation of the blower fan (83), air within the washing space (21) can be drawn into the suction port (81) and flow along the suction path (88) to the moisture-absorbing drying module (80).

[0126] Air introduced into the moisture-absorbing drying module (80) can pass through the desiccant (85). The desiccant (85) can be placed on one side of the discharge port (82). Air that has passed through the desiccant (85) can be discharged back into the washing space (21) through the discharge port (82).

[0127] Meanwhile, the absorbent (85) can absorb moisture contained in the air in the washing space (21) during the drying process (S5), and can be regenerated by releasing the absorbed moisture into the air during the washing process (S2) or the rinsing process (S3, S4).

[0128] Accordingly, the absorbent (85) may include a reversible absorbent material so as to absorb moisture or release absorbed moisture depending on the operating temperature range.

[0129] For example, the hygroscopic agent (85) 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.

[0130] Air passes between a plurality of absorbents (85) provided in the form of particles and can absorb moisture by coming into contact with the absorbents (85), or absorb moisture discharged from the absorbents (85).

[0131] Therefore, the desiccant (85) can act as a flow resistance to the airflow. To minimize such flow resistance, the particle size of the desiccant (85) can be selected so that pores are effectively formed and optimal moisture absorption efficiency is secured.

[0132] The regeneration heater (84) can be placed between the blower fan (83) and the desiccant (85). The regeneration heater (84) can generate heat when power is supplied. The regeneration heater (84) can heat the air to dry and regenerate the desiccant (85) during the regeneration process of the desiccant (85).

[0133] For example, when the blower fan (83) forms an airflow during the regeneration process of the absorbent (85), high-temperature air is introduced into the absorbent (85) by the regeneration heater (84), so that the regeneration of the absorbent (85) can occur smoothly.

[0134] When the moisture-absorbing drying module (80) performs moisture-absorbing drying of the washing space (21) or dishes, power may not be supplied to the regeneration heater (84). On the other hand, the blower fan (83) can continuously operate during both the regeneration process and the moisture absorption process of the absorbent (85) to form an air flow.

[0135] Meanwhile, although not shown, a thermostat for detecting whether the regeneration heater (84) is overheated and a temperature sensor for detecting the temperature of the air may be placed at a location adjacent to the regeneration heater (84).

[0136] The drying process through the moisture-absorbing drying module (80) and the regeneration process of the moisture absorbent (85) are explained.

[0137] After the washing of the dishes is finished, the washing water can be discharged outside the dishwasher (1) through the drain (44, see FIG. 2). Afterwards, any remaining moisture in the washing space (21) can be dried through the moisture-absorbing drying module (80).

[0138] When the blower fan (83) is operated, air in the washing space (21) is introduced into the moisture-absorbing drying module (80) through the intake port (81) and can be discharged into the washing space (21) through the discharge port (82). At this time, moisture in the air passing through the desiccant (85) can be absorbed by the desiccant (85).

[0139] Therefore, when the blower fan (83) operates continuously and circulates air within the washing space (21), drying of the washing space (21) and dishes can proceed. At this time, the regeneration heater (84) may not operate.

[0140] Meanwhile, the regeneration of the absorbent (85) can be performed during the washing process (S2) or the rinsing process (S3, S4). For example, when washing dishes, the blower fan (83) and the regeneration heater (84) operate, and high-temperature air can flow through the absorbent (85). At this time, the temperature of the air may be higher than the regeneration temperature of the absorbent (85). Therefore, the air passing through the absorbent (85) can absorb moisture from the absorbent (85).

[0141] The air discharged into the washing space (21) after absorbing moisture from the absorbent (85) can be condensed by the low-temperature washing water. Therefore, the moisture contained in the air is discharged to the outside of the dishwasher (1) through the drain (44), and the absorbent (85) can be regenerated.

[0142] The tub heater (24) can be spaced upward at a certain distance from the bottom surface (25). As a result, when the tub heater (24) heats the washing water or the air of the washing space (21), the bottom surface (25) can be prevented from overheating or deforming due to heat.

[0143] In addition, the tub heater (24) is spaced apart from the absorbent (85) placed in the machine room (22), thereby reducing the absorbent capacity of the absorbent (85) or preventing the absorbent (85) from being unintentionally regenerated.

[0144] In this drawing, it can be seen that the tub heater (24) is positioned above the level of the washing water (W). At this time, the washing water (W) may be drained to proceed with the drying process (S5) after the washing or rinsing of the dishes is finished.

[0145] Accordingly, when power is supplied to the tub heater (24) during the drying process (S5), the tub heater (24) can be used to heat the air in the washing space (21) to promote drying.

[0146] Referring to FIGS. 5 and 6, a dishwasher (1) according to one embodiment of the present disclosure is described for a washing space (21) or a drying process (S5) for drying dishes.

[0147] FIG. 5 shows the door (30) of a dishwasher (1) according to one embodiment of the present disclosure closing the tub (20), and FIG. 6 shows the door (30) partially open during the drying process (S5).

[0148] Meanwhile, the arrows indicated by dotted lines in the drawing represent the direction of air flow, but the actual direction of air flow in the cleaning space (21) may differ from the drawing.

[0149] Referring to FIG. 5, the interior of a dishwasher (1) according to one embodiment of the present disclosure can be seen.

[0150] The dishwasher (1) can perform the process of washing or rinsing dishes using washing water and then drying the dishes.

[0151] For example, when the washing of dishes with washing water is finished, the moisture-absorbing drying module (80) can operate the blower fan (83) to perform primary drying of the washing space (21).

[0152] At this time, moisture in the air within the washing space (21) can be absorbed by passing through the absorbent (85) of the moisture-absorbing drying module (80). As the absorbent (85) absorbs moisture, it generates heat, and the temperature of the air passing through the absorbent (85) and the air within the washing space (21) can rise.

[0153] Therefore, air discharged into the washing space (21) through the discharge port (82) can promote the evaporation of water in the washing space (21).

[0154] Afterwards, a secondary drying process can be carried out by operating the tub heater (24) to heat the air in the washing space (21). As a result, the evaporation of water in the washing space (21) can be further promoted, and the air in the washing space (21) can contain a larger amount of moisture.

[0155] Meanwhile, the operating time of the tub heater (24) may be within 3 minutes. If the tub heater (24) operates for longer than that, the air in the washing space (21) may become excessively overheated, which may cause deformation of the tableware. Additionally, the temperature of the washing space (21) heated by the tub heater (24) may be lower than the regeneration temperature of the absorbent (85).

[0156] Therefore, by operating the tub heater (24) within 3 minutes, drying efficiency can be improved, and at the same time, unintended regeneration of the absorbent (85) or a decrease in the absorption efficiency of the moisture-absorbing drying module (80) can be prevented.

[0157] Meanwhile, the tub heater (24) can be operated after the operation of the blower fan (83) of the moisture-absorbing drying module (80) has stopped. In this case, high-temperature air heated by the tub heater (24) flows into the moisture absorbent (85), thereby preventing the moisture absorbent (85) from being unintentionally regenerated or the moisture absorption efficiency of the moisture-absorbing drying module (80) from decreasing.

[0158] In addition, the operation of the blower fan (83) is stopped, so the total amount of moisture absorbed by the absorbent (85) until drying is completed can be reduced compared to the case where it is not. Therefore, there is also an advantage in that the energy required for the regeneration of the absorbent (85) can be reduced.

[0159] Meanwhile, after the tub heater (24) has been operating for a certain period of time, a process of cooling the tub heater (24) may be carried out.

[0160] For example, after the operation of the tub heater (24) is stopped, the cleaning water may be supplied so that at least a portion of the tub heater (24) is submerged in the cleaning water. At this time, the cleaning pump (45, see FIG. 2) may not operate.

[0161] After at least a portion of the tub heater (24) is submerged in washing water and the tub heater (24) is cooled, the washing water is drained again so that the drying process can proceed.

[0162] Meanwhile, since the thermal conductivity of the washing water is higher than that of air, the tub heater (24) can be cooled in a relatively shorter time than when cooled by convection from the operation of the blower fan (83).

[0163] Therefore, the drying time is not excessively delayed, and the user can be prevented from getting burned by contacting the tub heater (24).

[0164] Meanwhile, the washing water that is drained after cooling the tub heater (24) can be sent to a water jacket (not shown) for reuse.

[0165] A water jacket can be placed on the side of the tub (20). The water jacket can store washing water to be supplied to the tub (20) when washing or rinsing dishes.

[0166] The water jacket can condense water vapor within the washing space (21). For example, when the dishwasher (1) has completed a heated rinse, high-temperature water vapor may be present within the washing space (21).

[0167] The water jacket stores low-temperature water introduced from the water supply unit (43) or water drained after cooling the tub heater (24), so that water vapor in the washing space (21) can condense by exchanging heat with the water in the water jacket.

[0168] Therefore, moisture in the washing space (21) can be easily reduced by the water jacket, and drying of the washing space (21) or dishes can be promoted.

[0169] In this way, the washing water that cools the tub heater (24) is subsequently stored in the water jacket, so that the drying efficiency of the dishwasher can be increased in the subsequent course without wasting washing water.

[0170] Referring to FIG. 6, it can be seen that the door (30) of a dishwasher (1) according to one embodiment of the present disclosure is partially open.

[0171] The dishwasher (1) may partially open the door (30) during the drying process for efficient drying. The door (30) may be opened after the tub heater (24) has been operating for a certain period of time. The door (30) may be opened to allow for a third drying of the washing space (21).

[0172] The door (30) can be opened to the extent that the first rack (51), second rack (52), or top rack (53) in the washing space (21) cannot be pulled out.

[0173] For example, the door (30) can be opened to form an angle of 30° in the vertical direction. In this case, dust, foreign matter, etc. can be prevented from entering the dishwashing space (21), while drying of the dishwashing space (21) and the dishwashing space (21) can be promoted.

[0174] When the door (30) is opened, the air inside the washing space (21) can be exchanged with the outside air. Since the air inside the washing space (21), which has undergone first and second drying by the moisture-absorbing drying module (80) and the tub heater (24), is at a relatively high temperature compared to the outside air, the exchange with the outside air can occur smoothly due to the difference in density.

[0175] That is, when the door (30) is opened after the first and second drying by the moisture absorption drying module (80) and the tub heater (24), the moisture in the washing space (21) can be smoothly discharged to the outside, thereby shortening the drying time.

[0176] In particular, the air in the washing space (21) heated by the tub heater (24) can be exchanged with outside air more quickly when the door (30) is opened, so it can play a significant role in shortening the drying time.

[0177] In addition, as the air inside the washing space (21) heated by the tub heater (24) is rapidly discharged to the outside, the phenomenon of moisture from the hot and humid air condensing on the inner wall of the tub (20) or on the surface of the dishes can be prevented.

[0178] Furthermore, since the door (30) is opened while the internal air is heated by the tub heater (24), the drying of the dishes can be promoted without additional power consumption due to residual heat, and thus, the phenomenon of stains remaining on the dishes can be prevented.

[0179] Meanwhile, since some of the moisture in the washing space (21) is not completely absorbed by the absorbent (85) and is discharged to the outside, the total amount of moisture absorbed by the absorbent (85) until drying is completed can be reduced compared to the case where the door (30) is not opened.

[0180] As a result, the amount of absorbent (85) required to dry the washing space (21) is reduced, and the volume occupied by the absorbent (85) in the moisture-drying module (80) can be reduced. Therefore, the cost of the absorbent (85) can be reduced, and at the same time, the volume occupied by the moisture-drying module (80) in the machine room (22) can be reduced.

[0181] This can increase the efficiency of the parts arrangement within the machine room (22), reduce noise and vibration generated in the machine room (22), and allow heat to be discharged smoothly, thereby increasing the long-term durability of the dishwasher (1).

[0182] In addition, energy required for the regeneration of the absorbent (85) can be saved, which has the advantage of reducing the power consumed during the operation of the dishwasher (1).

[0183] The blower fan (83) can operate for a certain period of time after the door (30) is opened. When the blower fan (83) operates after the door (30) is opened, air flow is formed by the blower fan (83), and the circulation of air within the washing space (21) can be promoted. That is, the fourth drying of the washing space (21) can be achieved.

[0184] Therefore, high-temperature air passing through the absorbent (85) flows through the washing space (21), evaporates the water on the surface of the tableware, and as it is exchanged with external air, drying proceeds smoothly and the drying effect can be maximized.

[0185] Additionally, the user can recognize that the drying process of the dishwasher (1) is not completely finished even when the door (30) is opened due to the continuous operation of the blower fan (83).

[0186] Meanwhile, the blower fan (83) can operate until the tub heater (24) cools down to a temperature below a certain level, even after the drying of the washing space (21) is completed.

[0187] Due to the operation of the blower fan (83), the circulation of air within the tub (20) is promoted, and the temperature of the tub heater (24) can be lowered. Therefore, safety accidents such as burns caused by contact with the tub heater (24) can be prevented when the user takes out dishes from the tub (20) after washing is complete.

[0188] Meanwhile, after the door (30) is opened and the washing space (21) or the drying of dishes is completed by the operation of the blower fan (83), the door (30) can be closed again to seal the washing space (21).

[0189] As a result, safety accidents such as a user colliding with the door (30) while not realizing that the door (30) is open can be prevented.

[0190] In addition, after drying is complete, foreign substances such as dust can be minimized from entering the dishwashing space (21), thereby maintaining a clean state.

[0191] Referring to FIG. 7, the connection between the control unit (100) that controls the dishwasher (1) according to one embodiment of the present disclosure and each component can be confirmed.

[0192] The dishwasher (1) may include a control unit (100) for controlling each function. The control unit (100) may be provided in various forms, such as a microcontroller, a microcomputer, or a microprocessor, as known in the art, and may be mounted on a main circuit board (100a).

[0193] The control unit (100) may be electrically connected to a washing pump (45) for pressurizing and supplying washing water stored in the sump (41) to the spray unit (60). The control unit (100) may start or stop the operation of the washing pump (45) by interrupting the power supplied from the power supply unit (48) to the pump motor (453) or the washing water heater (454).

[0194] The control unit (100) can start the operation of the washing pump (45) by supplying power to the washing pump (45) through the power supply unit (48) during the washing stroke (S2), rinsing stroke (S3), or heating rinsing stroke (S4).

[0195] Meanwhile, the water level of the washing water can be detected by a measuring means such as a water level sensor (117), and the control unit (100) can determine whether to operate the tub heater (24) based on the water level of the washing water.

[0196] For example, the control unit (100) can operate the tub heater (24) when the water level of the washing water is below the tub heater (24) to heat the air in the washing space (21).

[0197] As another example, the control unit (100) can operate the tub heater (24) to heat the washing water when the water level of the washing water is above the tub heater (24). In this case, the washing water heater (454) is not operated, and the heating of the washing water and the heating of the air in the washing space (21) can be achieved by the tub heater (24).

[0198] Meanwhile, the control unit (100) may be electrically connected to the moisture absorption drying module (80). The control unit (100) may be electrically connected to a blower fan (83) that forms an air flow and a regeneration heater (84) that heats the air to be supplied to the absorbent (85). Accordingly, the control unit (100) may operate only the blower fan (83) when the moisture absorption drying module (80) performs moisture absorption, or operate the blower fan (83) and the regeneration heater (84) simultaneously when regenerating the absorbent (85).

[0199] The control unit (100) can be electrically connected to the door (30). The control unit (100) can control the opening and closing of the door (30). Accordingly, as described above, when the tub heater (24) stops after operating for a certain period of time, the control unit (100) can partially open the door (30).

[0200] Additionally, the control unit (100) may be electrically connected to a button unit (34) into which a user's operation command is input. When a user's power on / off operation input or a washing course selection operation is input through the button unit (34), the button unit (34) may transmit a corresponding electrical signal to the control unit (100).

[0201] When the control unit (100) receives an electrical signal from the button unit (34), it can control the dishwasher (1) to turn the power on or off or to perform individual operations of the dishwasher (1) according to the selected washing course.

[0202] The control unit (100) can be electrically connected to the temperature sensing unit (87). The control unit (100) can determine whether the temperature of the washing water has reached the target washing water temperature through the temperature sensing unit (87).

[0203] Meanwhile, in this drawing, the washing pump (45), the moisture-absorbing drying module (80), the tub heater (24), and the door (30) are shown receiving power indirectly from the power supply unit (48) through the main circuit board (100a). However, unlike this drawing, the moisture-absorbing drying module may be directly electrically connected to the power supply unit (48), and the control unit (100) may be configured to control whether the power supply unit (48) supplies power.

[0204] Referring to FIG. 8, the process and sequence of a dishwasher (1) according to one embodiment of the present disclosure can be observed.

[0205] The dishwasher (1) may include a pre-washing cycle (S1), a washing cycle (S2), a rinsing cycle (S3), a heating and rinsing cycle (S4), and a drying cycle (S5).

[0206] The pre-washing process (S1) may be a process of circulating washing water by driving the washing pump (45) without adding detergent. As a result, the first washing of the dishes can be performed.

[0207] The washing process (S2) may be a process of washing dishes by circulating washing water with detergent added. As a result, secondary washing of the dishes may be performed.

[0208] The rinsing process (S3) and the heated rinsing process (S4) may be processes that remove residual detergent from dishes by circulating washing water. At this time, rinse may be supplied from the detergent supply device of the door (30).

[0209] Meanwhile, the washing process (S2), rinsing process (S3), or heating and rinsing process (S4) can be referred to as the main process.

[0210] When performing the rinsing process (S3) or the heating rinsing process (S4), heated washing water may be supplied. Accordingly, the tableware is heated to a predetermined temperature, and in the subsequent drying process (S5), the drying efficiency of the tableware can be improved and the drying time can be shortened.

[0211] The above-mentioned detailed procedures can be combined and adjusted to be omitted or performed redundantly depending on the settings or options of the selected washing course.

[0212] At this time, between each administration, a drainage administration of the washing water used during each administration and a water supply administration of supplying new washing water may be included.

[0213] For example, a water supply process may be included before the pre-washing process (S1). For example, a drainage process and a water supply process may be performed between the pre-washing process (S1) and the washing process (S2), between the washing process (S2) and the rinsing process (S3), and between the rinsing process (S3) and the heating and rinsing process (S4). For example, a drainage process may be performed between the heating and rinsing process (S4) and the drying process (S5).

[0214] Referring to FIG. 9, the heating and rinsing cycle (S4) and drying cycle (S5) of a dishwasher (1) according to one embodiment of the present disclosure can be seen.

[0215] Meanwhile, although only some steps of the heating and rinsing process (S4) are illustrated in this drawing, unlike this drawing, the heating and rinsing process (S4) may include various steps.

[0216] The heating and rinsing process (S4) may include a step (S41) of stopping the washing water heater (454) after operating it for a certain period of time. This may be a step (S41) of heating the washing water supplied to the washing space (21) with the washing water heater (454). The washing water may be heated through the washing water heater (454) rather than the tub heater (24).

[0217] In this case, as described above, since the roles of each heater (24, 454) are distinguished, the tub heater (24) does not need to be continuously heated for heating the washing water and heating the air in the washing space (21). Therefore, the durability of the tub heater (24) can be improved, and the total operating time of the dishwasher (1) can be shortened.

[0218] Meanwhile, after the step (S41) of heating the washing water through the washing water heater (454), the step (S51) of draining the washing water can be performed so that the water level of the washing water inside the tub (20) is located below the tub heater (24).

[0219] The specific heat of water is relatively greater than that of air. Therefore, if at least a portion of the tub heater (24) is submerged in the washing water, the power supplied to the tub heater (24) is used to heat the water, and the temperature of the air in the washing space (21) may not be sufficiently raised.

[0220] Therefore, by draining the washing water so that the water level of the washing water is below that of the tub heater (24), the tub heater (24) can efficiently heat the air.

[0221] Meanwhile, although the drying process (S5) is depicted in this drawing as including a drainage process (S51), the drying process (S5) may not include a drainage process (S51). As previously mentioned, the drainage process (S51) may be performed between the heating and rinsing process (S4) and the drying process (S5).

[0222] The drying process (S5) may include a step (S52) in which the blower fan (83) stops after operating for a certain period of time. This may be a step (S52) of first drying the washing space (21) inside the tub (20) where the tableware is placed by operating the moisture-absorbing drying module (80).

[0223] After the blower fan (83) is stopped, a step (S53) in which the tub heater (24) operates for a certain period of time and then stops may be performed. This may be a step (S53) of operating the tub heater (24) placed on one side of the tub (20) to dry the washing space a second time.

[0224] After the operation of the tub heater (24) is stopped, a step (S54) in which the door (30) is opened may proceed. This may be a step (S54) of opening the door (30) that opens and closes the tub (20) to dry the washing space (21) a third time.

[0225] As described above, after the operation of the blower fan (83) is stopped, the tub heater (24) is operated so that the temperature of the air in the washing space (21) can be raised, and the amount of water evaporation in the washing space (21) increases, so that the inside of the tub (20) can be filled with hot and humid air.

[0226] Therefore, when the door (30) is opened, the hot and humid air inside the washing space (21) can be exchanged with the air outside the dishwasher (1). As a result, relatively dry air can naturally convect through the washing space (21), and drying of the washing space (21) can be promoted.

[0227] After the door (30) is opened, a step (S55) in which the blower fan (83) operates for a certain period of time and then stops may be performed. As a result, the fourth drying of the washing space (21) may be performed.

[0228] As described above, when the blower fan (83) is operated after the door (30) is opened, the air within the washing space (21) circulates smoothly and the drying of the washing space (21) can be promoted. Therefore, when the blower fan (83) is stopped after operating for a certain period of time, the washing space (21) or the dishes can be completely dried.

[0229] Referring to FIG. 10, the heating and rinsing cycle (S4') and drying cycle (S5) of a dishwasher (1) according to another embodiment of the present disclosure can be seen.

[0230] Meanwhile, although only some steps of the heating and rinsing process (S4') are illustrated in this drawing, unlike this drawing, the heating and rinsing process (S4') may include various steps.

[0231] The heating and rinsing process (S4') may include a step (S41') of stopping the tub heater (24) after operating it for a certain period of time. This may be a step (S41') of heating the washing water for washing dishes placed in the washing space (21) using the tub heater (24). The washing water may be heated through the tub heater (24) rather than the washing water heater (454).

[0232] In this case, as described above, the tub heater (24) can replace the wash water heater (454). By using a single tub heater (24) for heating the wash water and the air in the wash space (21), the material cost of the wash water heater (454) can be reduced, and the space of the machine room (22) can be made larger.

[0233] Other control methods are the same as those of the dishwasher (1) according to one embodiment of the present disclosure, so a detailed description thereof is omitted.

[0234] Although preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above. Various modifications are possible by those skilled in the art without departing from the essence of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present disclosure.

Claims

1. A tub forming a washing space for accommodating dishes; A door for opening and closing the above washing space; A tub heater disposed on one side of the above tub and heating the air of the washing space; and It includes a moisture-absorbing drying module disposed on one side of the above tub and drying the washing space, and A dishwasher that, in a drying process for drying dishes placed in the washing space, operates the moisture absorption drying module and the tub heater, and then opens the door.

2. In Paragraph 1, The above dishwasher is, A dishwasher that, before opening the door, operates the moisture absorption drying module for a certain period of time and then stops it, and operates the tub heater for a certain period of time and then stops it.

3. In Paragraph 2, The above dishwasher is, A dishwasher that operates the moisture absorption and drying module for a certain period of time after opening the door.

4. In Paragraph 2, A dishwasher in which the operating time of the above tub heater is within 3 minutes.

5. In Paragraph 2, A dishwasher in which the temperature of the washing space heated by the above tub heater is lower than the regeneration temperature of the absorbent of the above moisture-absorbing drying module.

6. In Paragraph 1, The above dishwasher is, A dishwasher further comprising a wash water heater for heating wash water supplied to the wash space.

7. In Paragraph 6, The above dishwasher is, A dishwasher that, in the main cycle of washing dishes placed in the washing space, stops the washing water heater after operating it for a certain period of time, and proceeds with the drying cycle after the main cycle.

8. In Paragraph 1, The above tub heater is a dishwasher spaced upward at a certain distance from the bottom surface of the tub.

9. In Paragraph 8, The above tub heater is a dishwasher that is positioned above the water level of the washing water inside the tub during the drying process.

10. In Paragraph 9, The above dishwasher is, A dishwasher that drains the washing water in the above drying process such that the water level of the washing water in the tub is located below the tub heater.

11. In Paragraph 8, The above tub heater is a dishwasher in which at least a portion is submerged in the washing water to heat the washing water during the main cycle of washing dishes placed in the washing space.

12. In Paragraph 11, The above tub heater is a dishwasher that stops after operating for a certain period of time in the main cycle and stops after operating for a certain period of time in the drying cycle.

13. A step of operating a moisture-absorbing drying module to first dry the washing space inside the tub where the tableware is placed; A step of secondarily drying the washing space by operating a tub heater disposed on one side of the tub; and A control method for a dishwasher comprising the step of opening a door that opens and closes the tub to dry the washing space a third time.

14. In Paragraph 13, A control method for a dishwasher that further includes the step of operating the moisture absorption drying module to dry the washing space a fourth time after the step of opening the door.

15. In Paragraph 13, A control method for a dishwasher that further includes the step of heating washing water for washing dishes placed in the washing space with the tub heater prior to the step of drying the washing space first.

16. In Paragraph 15, A control method for a dishwasher comprising, after the step of heating the washing water with the tub heater, the step of draining the washing water so that the water level of the washing water in the tub is located below the tub heater.

17. In Paragraph 13, A control method for a dishwasher that further includes the step of heating the washing water supplied to the washing space with a washing water heater prior to the step of drying the washing space first.

Images