Dish washer

Abstract

The present invention relates to a dishwasher capable of providing various selection options for washing water heating modes by configuring it to allow the free selection of multiple washing water heating modes generated by combining a heat pump module and a washing water heater as a heating source, depending on the intention of a user who prioritizes power consumption or a user who prioritizes time reduction.

Description

Technology Field

[0001] The present invention relates to a dishwasher, and more specifically, to a dishwasher configured to allow the free selection of multiple washing water heating modes generated by combining a heat pump module and a washing water heater as a heating source, depending on the intention of a user who prioritizes power consumption or a user who prioritizes time reduction, thereby enabling the provision of various selection options for washing water heating modes. Background Technology

[0002] A dishwasher is a device that cleans items stored inside, such as dishes and cooking utensils, by spraying cleaning water, such as regular water. At this time, the cleaning water used may contain detergent.

[0003] A dishwasher is generally configured to include a tub forming a washing space, a storage compartment accommodating objects to be washed inside the tub, a spray arm spraying washing water into the storage compartment, and a sump storing water and supplying washing water to the spray arm.

[0004] By using such a dishwasher, the time and effort required for washing items such as dishes after a meal can be reduced, thereby contributing to user convenience.

[0005] When using a dishwasher for washing, the wash water and air can be heated to enhance the washing effect. An electric heater can be used as a means of heating the wash water and air.

[0006] Meanwhile, as an alternative heating method, dishwashers equipped with a heat pump device or a heat pump device in conjunction with an electric heater are emerging.

[0007] Since heat pumps have significantly higher energy efficiency compared to electric heaters, heating wash water with a heat pump can reduce electricity consumption compared to electric heaters.

[0008] In this regard, German Patent Publication No. 10-2013-102157 (Prior Art 001), U.S. Patent Publication No. 20120167920 (Prior Art 002), and European Patent Publication No. 2064982 (Prior Art 003) each disclose a configuration of a dishwasher including a heat pump device and an electric heater as a heat source for the washing water. Prior art literature

[0009] German Patent Publication No. 10-2013-102157, U.S. Patent Publication No. 20120167920, European Patent Publication No. 2064982 The problem to be solved

[0010] However, while the dishwashers disclosed in the aforementioned prior art mention a configuration for heating wash water through the simultaneous or sequential operation of a heat pump device and an electric heater, they are configured in such a way that the wash water heating mode cannot be subdivided and set according to the user's requirements or requests.

[0011] Therefore, the dishwashers disclosed in the aforementioned prior art have the problem of failing to consider user convenience.

[0012] Accordingly, the dishwasher disclosed in the prior art is configured such that it is impossible to switch to another mode during the process of a mode in which the wash water is heated using a heat pump device, an electric heater, or a combination thereof.

[0013] Therefore, depending on the specific wash water heating mode, it has the problem of failing to reflect the user's intention to switch to energy-saving mode or rapid mode during the wash process, which may cause inconvenience to the user.

[0014] The present invention has been devised to solve the problems of the aforementioned conventional technology, and its first objective is to provide a dishwasher capable of providing various selection options for washing water heating modes by configuring it to allow the free selection of multiple washing water heating modes generated by combining a heat pump module and a washing water heater as a heating source, depending on the intention of a user who prioritizes power consumption or a user who prioritizes time reduction.

[0015] In addition, the second objective of the present invention is to provide a dishwasher that can significantly improve user convenience by configuring it to allow switching to another heating mode according to the user's intention even while heating the wash water in a specific wash water heating mode is in progress.

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

[0017] A dishwasher according to the present invention comprises: a tub forming a washing space and accommodating dishes; a sump storing washing water to be supplied to the tub; a washing pump pressurizing washing water to be supplied to the tub; an electric washing water heater heating washing water supplied to the sump; and a heat pump module heating washing water supplied to the sump; wherein, depending on the heating mode for washing water, either the heat pump module or the washing water heater is selected as the heating source for washing water.

[0018] In addition, the heating mode is selected from a general mode, an energy-saving mode, and a rapid mode, and while the heating of the washing water is in progress in any one of the heating modes among the general mode, the energy-saving mode, and the rapid mode, it may be possible to switch to any one of the remaining heating modes.

[0019] In addition, when the heating mode is the general mode, the heat pump module and the wash water heater may be selected as the heating source.

[0020] Additionally, the washing water is heated by the heat pump module and the operation of the washing water heater is stopped until the washing water temperature reaches a first target temperature, and the washing water is heated by the washing water heater and the operation of the heat pump module is stopped until the washing water temperature exceeds the first target temperature and reaches a second target temperature.

[0021] In addition, the operation of the washing pump may be stopped when the washing water temperature reaches the first target temperature.

[0022] In addition, when the heating mode is the energy saving mode, the heat pump module is selected as the heating source, and the operation of the wash water heater can be stopped.

[0023] In addition, the washing water can be heated by the heat pump module until the washing water temperature reaches a first target temperature and until the washing water temperature exceeds the first target temperature and reaches a second target temperature.

[0024] In addition, the operation of the washing pump may be stopped when the washing water temperature reaches the first target temperature.

[0025] In addition, when the heating mode is the rapid mode, the heat pump module and the wash water heater may be selected as the heating source.

[0026] In addition, the washing water can be heated by the heat pump module and the washing water heater until the washing water temperature reaches a first target temperature and until the washing water temperature exceeds the first target temperature and reaches a second target temperature.

[0027] In addition, power supply to the heat pump module and the washing water heater is initiated simultaneously and turned on simultaneously, and when the second target temperature is reached, the power supplied to the heat pump module and the washing water heater is cut off simultaneously and turned off simultaneously.

[0028] In addition, the operation of the washing pump may be stopped when the washing water temperature reaches the first target temperature.

[0029] In addition, the first target temperature may fall within a numerical range of 50℃ or higher and 70℃ or lower.

[0030] In addition, the second target temperature mentioned above may be the steam generation temperature at which the washing water vaporizes.

[0031] Meanwhile, the dishwasher according to the present invention comprises: a tub that forms a washing space and accommodates dishes; a sump that stores washing water to be supplied to the tub; a heat pump module that heats the washing water supplied to the sump; and an electric washing water heater that heats the washing water supplied to the sump; and is characterized in that the turn-on status of the washing water heater and the turn-on and turn-off timings are set differently according to the heating mode for the washing water.

[0032] In addition, the heating mode is selected from a general mode, an energy-saving mode, and a rapid mode, and while the heating of the washing water is in progress in any one of the heating modes among the general mode, the energy-saving mode, and the rapid mode, it may be possible to switch to any one of the remaining heating modes.

[0033] In addition, the time it takes for the washing water temperature to reach the target temperature can be shortened in the order of the energy-saving mode, the general mode, and the rapid mode.

[0034] In addition, when the heating mode is the general mode, power can be supplied to the heat pump module first so that the heat pump module is turned on, and then power can be supplied to the wash water heater so that the wash water heater is turned on.

[0035] In addition, when the heating mode is the energy-saving mode, power is first supplied only to the heat pump module so that the washing water is heated only by the heat pump module, and the washing water heater can be kept in a turned-off state while the washing water is being heated.

[0036] In addition, when the heating mode is the rapid mode, power is supplied to the heat pump module and the washing water heater simultaneously, so that the washing water can be heated while the heat pump module and the washing water heater are turned on simultaneously. Effects of the invention

[0037] The dishwasher according to the present invention is configured to allow the washing water heating mode to be freely selected according to the intention of a user who prioritizes power consumption or a user who prioritizes time reduction, thereby providing the effect of enabling various selection options for the washing water heating mode.

[0038] In addition, the dishwasher according to the present invention is configured to allow switching to another heating mode according to the user's intention even while heating of the wash water is in progress in a specific wash water heating mode, thereby having the effect of significantly improving user convenience.

[0039] In addition to the effects described above, the specific effects of the present invention are described together with the specific details for implementing the invention below. Brief explanation of the drawing

[0040] FIG. 1 is a front perspective view of a dishwasher according to an embodiment of the present invention. Figure 2 is a schematic cross-sectional view of the dishwasher shown in Figure 1. FIG. 3 is a front perspective view showing the door of the dishwasher shown in FIG. 1 in an open state. FIG. 4 is a schematic diagram illustrating the configuration of a heat pump module provided in a dishwasher according to the present invention. FIG. 5 is a front perspective view illustrating an exemplary configuration of a heat pump module constituting a dishwasher according to the present invention, in a state accommodated in a base. FIG. 6 is a plan view showing the state in which the heat pump module illustrated in FIG. 5 is mounted on a base. FIG. 7 is a schematic diagram illustrating the process in which the washing water is heated by the heat pump module or washing water heater shown in FIG. 5 when the dishwasher is in the washing cycle or the heated rinse cycle. FIG. 8 is a functional block diagram for explaining the configuration of a control unit of a dishwasher according to an embodiment of the present invention. FIG. 9 is a time-temperature graph to explain the situation in which the heating of washing water proceeds in standard mode or general mode according to the first embodiment of the dishwasher according to the present invention. FIG. 10 is a time-temperature graph to explain the situation in which the washing water is heated in an energy-saving mode according to a second embodiment of the dishwasher according to the present invention. FIG. 11 is a time-temperature graph to explain the situation in which the washing water is heated in rapid mode according to the third embodiment of the dishwasher according to the present invention. FIGS. 12 to 17 are flowcharts for explaining the steps of a control method performed by the control unit illustrated in FIG. 8. Specific details for implementing the invention

[0041] The aforementioned objectives, features, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0042] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0043] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0044] In the following, the statement that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0045] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0046] Singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may be omitted or additional components or steps may be included.

[0047] Additionally, singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may not be included, or that additional components or steps may be included.

[0048] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise, and "C to D" means C or more and D or less unless specifically stated otherwise.

[0049] Hereinafter, the present invention will be described with reference to drawings illustrating the configuration according to an embodiment of the present invention.

[0050] [Overall Structure of the Dishwasher]

[0051] Hereinafter, the overall structure of the dishwasher (1) according to the present invention will be described in detail with reference to the attached drawings.

[0052] FIG. 1 is a front perspective view showing a dishwasher (1) according to the present invention, FIG. 2 is a simplified cross-sectional view showing the internal structure of the dishwasher (1) according to the present invention, and FIG. 3 is a front perspective view showing the dishwasher (1) with the door (30) open.

[0053] As illustrated in FIGS. 1 to 3, the dishwasher (1) according to the present invention may include a case (10) that forms an outer shape.

[0054] For example, the case (10) may include an upper panel (11), a left side panel (12), a right side panel (13), and a front panel (15) that form the upper surface, left side, and right side, respectively, of the exterior of the dishwasher (1).

[0055] These upper panel (11), left side panel (12), right side panel (13) and front panel (15) can be formed integrally or formed individually and assembled.

[0056] In addition, the dishwasher (1) according to the present invention may include a tub (20) that is installed inside a case (10), forms a washing space (21) where objects to be washed are washed, and has an open front surface.

[0057] In addition, the dishwasher (1) according to the present invention may include a door (30) that opens and closes the open front surface of the tub (20).

[0058] In addition, the dishwasher (1) according to the present invention may include a base (90) that is positioned at the bottom of the tub (2) and serves to support the tub (2).

[0059] Additionally, the dishwasher (1) according to the present invention may include a drive unit (40) located at the bottom of the tub (20) for supplying, collecting, circulating, and draining washing water for washing objects.

[0060] In addition, the dishwasher (1) according to the present invention may include a storage portion (50) that is detachably provided in the internal washing space (21) of the tub (20) and on which an object to be washed is placed.

[0061] In addition, the dishwasher (1) according to the present invention may include a spray unit (60) installed adjacent to the storage unit (50) and spraying water for washing objects to be washed.

[0062] At this time, the objects to be cleaned placed in the storage section (50) may be, for example, tableware such as bowls, plates, spoons, chopsticks, and other cooking utensils. Unless otherwise mentioned below, the objects to be cleaned will be referred to as tableware.

[0063] First, the tub (20) can be formed in a box shape with the front surface completely open, corresponding to a configuration known as a so-called washing tank.

[0064] A washing space (21) is formed inside the tub (20), and the open front surface can be opened and closed by a door (30).

[0065] The tub (20) can be formed by press forming a metal plate that is resistant to high temperature and moisture, for example, a stainless steel-based material.

[0066] Additionally, on the inner surface of the tub (20), a plurality of brackets may be arranged for the purpose of supporting and installing functional components such as the storage unit (50), injection unit (60), etc., described later, inside the tub (20).

[0067] Meanwhile, the drive 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 to the sump (41) from the outside, a drainage unit (44) for discharging washing water from the sump (41) to the outside, a washing pump (45) for supplying washing water from the sump (41) to the spray unit (60), and a supply path (46).

[0068] The sump cover (42) is positioned above the sump (41) and can serve to spatially separate the tub (20) and the sump (41).

[0069] Additionally, 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 spraying unit (60) into the sump (41).

[0070] That is, the washing water sprayed from the spray unit (60) toward the dishes falls to the bottom of the washing space (21) and can be recovered back into the sump (41) via the sump cover (42).

[0071] The washing pump (45) is provided on one side of the sump (41) and functions to pressurize washing water and supply it to the spray unit (60).

[0072] One end of the washing pump (45) can be connected to the sump (41) and the other end can be connected to the supply path (46).

[0073] The washing pump (45) may be equipped with an impeller (451) and a motor (453), etc. 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 spraying unit (60) through the supply path (46).

[0074] Although not shown, the washing pump (45) may be equipped with a washing water heater (48) as a heating source for heating the washing water supplied to the tub (20) during the washing or heating and rinsing process.

[0075] Meanwhile, the supply channel (46) serves to selectively supply washing water supplied from the washing pump (45) to the spraying unit (60).

[0076] For example, the supply channel (46) may include a first supply channel (461) connected to the lower injection arm (61), and a second supply channel (463) connected to the upper injection arm (62) and the top nozzle (63).

[0077] The supply channel (46) may be equipped with a supply channel switching valve (465) that selectively opens and closes the supply channels (461, 463).

[0078] At this time, the supply flow switching valve (465) can be controlled so that each supply flow (461, 463) is opened sequentially and selectively or simultaneously.

[0079] Meanwhile, the spraying unit (60) is provided to spray washing water onto dishes stored in the storage unit (50).

[0080] More specifically, the spraying unit (60) may include a lower spray arm (61) located at the bottom of the tub (20) and spraying cleaning water to the lower rack (51).

[0081] Additionally, the spraying unit (60) may include an upper spraying arm (62) located between the lower rack (51) and the upper rack (52) and spraying cleaning water to the lower rack (51) and the upper rack (52).

[0082] Additionally, the spraying unit (60) may include a top nozzle (63) located at the top of the tub (20) and spraying washing water to the top rack (53) or the upper rack (52).

[0083] 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 as to spray washing water while rotating toward the dishes mounted in the storage unit (50).

[0084] The lower spray arm (61) can be rotatably supported on the upper side of the sump cover (42) so as to rotate at the lower side of the lower rack (51) and spray cleaning water toward the lower rack (51).

[0085] In addition, the upper spray arm (62) can be rotatably supported by a spray arm holder (467) so that it can spray cleaning water while rotating between the lower rack (51) and the upper rack (52).

[0086] Meanwhile, although not shown, the lower wall (25) of the tub (20) may be further provided with means to divert the cleaning water sprayed from the lower spray arm (61) to the upper direction (U-direction) in order to increase cleaning efficiency.

[0087] Since the detailed configuration of the injection unit (60) can be any configuration already known in the industry, the description of the specific configuration of the injection unit (60) below will be omitted.

[0088] Meanwhile, the washing space (21) may be provided with a storage section (50) for storing tableware.

[0089] The storage unit (50) can be provided to be inserted and removed from the interior of the tub (20) through the open front surface of the tub (20).

[0090] For example, FIG. 2 illustrates an embodiment comprising a storage unit configured to include a lower rack (51) located at the bottom of the tub (20) and capable of storing relatively large tableware, an upper rack (52) located above the lower 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.

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

[0092] These lower racks (51), upper racks (52) and top racks (53) can each be configured to be pulled out to the outside through the open front surface of the tub (20).

[0093] To this end, guide rails (54) may be provided on the side walls (26, 27) forming the inner surface of the tub (20). As described below, the guide rails (54) may include, for example, an upper rail (542), a lower rail (541), and a top rail (543).

[0094] A roller or wheel may be provided on the lower rack (51), upper rack (52), and top rack (53), respectively. By pulling the lower rack (51), upper rack (52), and top rack (53) out through the front of the tub (20), the user can store dishes in them or easily take out dishes that have been washed from them.

[0095] The guide rail (54) may be provided as a fixed guide rail in the form of a simple rail to guide the withdrawal and insertion of the storage unit (50), or as an extendable guide rail that guides the withdrawal and insertion of the storage unit (50) and increases the withdrawal distance as the storage unit (50) is withdrawn.

[0096] Meanwhile, the door (30) is intended to open and close the open front surface of the tub (20) described above.

[0097] A hinge portion (not shown) for opening and closing the door (30) may be provided at the lower part of the normally open front surface. For example, the door (30) may rotate in a top-down manner with the hinge portion as a rotation axis, thereby opening the tub (20).

[0098] Here, on the outer surface of the door (30), a handle (31) for opening the door (30) and a control panel (32) for controlling the operation of the dishwasher (1) may be provided.

[0099] As described above, the control panel (32) may be equipped with a display (33) that visually displays information regarding the current operating status of the dishwasher (1), etc.

[0100] Additionally, the control panel (32) may be provided with a button section (34) including a selection button for inputting a user's course selection operation and a power button for inputting a user's operation to turn the dishwasher on and off.

[0101] Meanwhile, the rear panel forming the inner side of the door (30) can form one side of the tub (20) when the door (30) is closed, and at the same time, form a seating surface that can support the lower rack (51) of the storage unit (50) when the door (30) is fully opened.

[0102] To this end, when the door (30) is fully opened, it is preferable that the rear panel of the door (30) forms a horizontal plane in the same direction as the guide rail (54) in which the lower rack (51) is guided extends.

[0103] Meanwhile, the rear panel forming the inner side of the door (30) may be further equipped with a detergent supply device for automatically supplying detergent into the interior of the tub (20).

[0104] Additionally, a door position detection unit (36) for detecting whether the door (30) is in a closed state or an open state may be provided on the outer side of the upper surface of the tub (20). For example, the door position detection unit (36) may include a door position sensor (S_d) or a latch sensor that detects the position of a door latch not shown.

[0105] Meanwhile, a drying air supply unit (80) for generating and supplying high or low temperature drying air to the cleaning space inside the tub (20) may be provided at the bottom of the tub (20).

[0106] As described above, the drying air supply unit (80) may be configured to include a filter member (883) for filtering external air, a blower fan (825) for generating a drying air stream, a heater (84) for heating the drying air stream, and an airflow guide (83) that is positioned inside the tub (20) and guides the drying air stream.

[0107] The lower wall (25) of the tub (20) may be provided with a drying air supply hole (254) so ​​that high-temperature drying air generated from the drying air supply unit (80) can be introduced into the interior of the tub (20).

[0108] By supplying high-temperature drying air or low-temperature drying air through such a drying air supply unit (80) into the interior of the tub (20) during the drying process, the drying efficiency and sterilization effect for tableware can be significantly improved compared to conventional methods.

[0109] Meanwhile, some of the airflow supplied into the interior of the tub (20) and humidified while drying the dishes may be discharged to the outside, and the remaining portion may be sucked into the drying air supply unit (80), and the discharge of the airflow may be achieved through partial opening of the door (30) or through a separate exhaust means not shown.

[0110] A duct section (81) for recovering humid air from the tub (20) may be provided on the outer side of the left wall (26) or the outer side of the right wall (27) of the tub (20).

[0111] Meanwhile, the base (90) can provide a receiving space for components of the dishwasher (1), such as a sump (41).

[0112] To this end, the base (90) may include an outer perimeter wall forming the outer boundary of the receiving space. More specifically, the outer perimeter wall of the base (90) may include a front wall, a rear wall, a left wall, and a right wall.

[0113] Furthermore, the tub (20) can be directly or indirectly supported through the front wall, rear wall, left wall, and right wall of the base (90).

[0114] Meanwhile, the dishwasher (1) according to the present invention may further include a heat pump system as a means for heating the washing water to be supplied to the tub (20).

[0115] The heat pump system may be provided together with the aforementioned washing water heater (48), or provided independently without the washing water heater (48).

[0116] As described below, the heat pump system provided in the dishwasher (1) according to the present invention can be placed inside the base (90) in a modularized state.

[0117] In addition, the heat pump system is modularized and configured to be inserted and removed from the base (90) in a batch.

[0118] In consideration of this, the heat pump system provided in the dishwasher (1) according to the present invention shall be referred to as a heat pump module (100).

[0119] The detailed configuration of the heat pump module (100) will be described later with reference to FIG. 4 and below.

[0120] [Schematic Configuration of a Heat Pump System]

[0121] Hereinafter, the detailed configuration of a heat pump module (100) according to an embodiment of the present invention will be described with reference to FIG. 4 and below.

[0122] FIG. 4 is a schematic diagram showing the configuration of a heat pump module (100).

[0123] Referring to FIG. 4, the heat pump module (100) may be configured to include a compressor (110), a condenser (120), an expansion valve (140), and an evaporator (130).

[0124] The compressor (110), condenser (120), expansion valve (140), and evaporator (130) can be sequentially connected through a refrigerant pipe (150), and the refrigerant pipe (150) provides a refrigerant flow path through which the refrigerant can flow.

[0125] For example, the refrigerant piping (150) may be configured to include a first pipe (151) connecting the compressor (110) and the condenser (120), a second pipe (152) connecting the condenser (120) and the expansion valve (140), a third pipe (153) connecting the expansion valve (140) and the evaporator (130), and a fourth pipe (154) connecting the evaporator (130) and the compressor (110).

[0126] The refrigerant can function as a working fluid that absorbs or releases heat while undergoing a phase change from liquid to gas or vice versa as it circulates sequentially through the compressor (110), condenser (120), expansion valve (140), and evaporator (130).

[0127] The compressor (110) compresses the refrigerant and discharges the refrigerant in a high temperature and high pressure state. The refrigerant discharged from the compressor (110) can be introduced into the condenser (120) through the first pipe (151).

[0128] The refrigerant can release heat of QH as it passes through the condenser (120). The heat released from the condenser (120) can be used to heat the wash water to be supplied to the tub (20). As described below, depending on the heating mode, the condenser (120) can be selected as a heat source for the wash water, either together with or alone, a wash water heater (48) provided in the wash pump (45).

[0129] Accordingly, the condenser (120) may be provided with separate flow paths through which the refrigerant and the cleaning water pass. As the refrigerant passes through the condenser (120), it releases heat and undergoes a phase change from a gaseous state to a liquid state, thereby exchanging heat with the cleaning water.

[0130] At this time, the refrigerant that passes through the condenser (120) may be a mixture of liquid and gas with a very low proportion of gas, or a subcooled liquid.

[0131] The refrigerant exiting the condenser (120) can expand as it passes through the expansion valve (140). As a result of the expansion of the refrigerant, the temperature of the refrigerant is lowered, and the refrigerant can become a mixed gas in which gas and liquid are mixed.

[0132] The refrigerant exiting the expansion valve (140) is introduced into the evaporator (130) via the third pipe (153), and as it passes through the evaporator (130), it exchanges heat with the air in the receiving space of the base (90), absorbs QL of heat from the air and evaporates, thereby increasing the proportion of gas in the refrigerant.

[0133] When the refrigerant exits the evaporator (130), it may be a mixed gas with a very low proportion of liquid or a superheated gas.

[0134] The refrigerant exiting the evaporator (130) passes through the fourth pipe (154) and flows back into the compressor (110), and after being introduced into the compressor (110), it can be compressed and converted into a high-temperature and high-pressure gas. Meanwhile, in order to prevent the introduction of liquid refrigerant discharged from the evaporator (130), the refrigerant passing through the fourth pipe (154) can be introduced into the compressor (110) after passing through a gas-liquid separator (113).

[0135] In this order, the refrigerant circulates through the heat pump module (100) and undergoes a phase change, and accordingly, the refrigerant can absorb heat in the evaporator (130) and release heat in the condenser (120).

[0136] Meanwhile, in order to increase the heat exchange efficiency of the refrigerant in the evaporator (130), it is desirable to allow a large amount of air to flow toward the evaporator (130). To this end, the heat pump module (100) may further be equipped with a blower module (180) that blows air toward the evaporator (130) to generate an airflow.

[0137] As described below, the blower module (180) may be configured to include, for example, a blower fan (181) that accelerates air to generate an airflow, and a blower motor (182) that generates rotational driving force for the blower fan (181).

[0138] Additionally, as described below, the blower fan (181) and the blower motor (182) can be housed together with the evaporator (130) inside a heat exchange duct (170) that forms a passage through which airflow to be heat exchanged with the evaporator (130) flows.

[0139] Meanwhile, for example, the heat pump module (100) may be installed directly on the base (90), or may be configured to be installed collectively in the receiving space of the base (90) in a modularized state separate from the base (90) and to be removed collectively from the receiving space of the base (90).

[0140] Figure 5 and below illustrates an exemplary configuration in which a heat pump module (100) is installed collectively in the receiving space of the base (90) in a modularized state separate from the base (90) and is removed collectively from the receiving space of the base (90).

[0141] The present invention is not limited thereto, but will be described below based on the illustrated configuration.

[0142] As illustrated in FIG. 6, for batch installation and batch removal, the heat pump module (100) may, for example, include a module base (160) on which at least a compressor (110), an evaporator (130), and an expansion valve (140) are installed in batch.

[0143] The compressor (110), evaporator (130), and expansion valve (140) constituting the heat pump module (100) can be mounted on the base (90) in a state where they are directly connected to the module base (160) and directly supported by the module base (160).

[0144] The module base (160) is positioned so as to be in surface contact with the bottom surface (91) of the base (90) and can be positioned on the base (90) so as to be directly supported through the bottom surface (91) of the base (90).

[0145] However, the condenser (120) may be configured to be mounted on the module base (160) or directly or indirectly fixed and supported on the bottom surface (91) of the base (90) other than the module base (160).

[0146] Accordingly, the compressor (110), evaporator (130), and expansion valve (140) constituting the heat pump module (100) can be placed on the base (90) in a state where they are indirectly installed and indirectly supported in the receiving space of the base (90) through the module base (160).

[0147] Meanwhile, the heat pump module (100) of the dishwasher (1) according to the present invention may be installed collectively in the receiving space of the base (90), and configured so that the heat pump module (100) can be removed collectively from the receiving space of the base (90) to the outside, and the heat pump module (100) may be configured to be inserted and removed collectively through an open side of the base (90).

[0148] As illustrated in FIG. 6, a water jacket (71) in which washing water is stored and supplied to the tub (20) for use during washing and rinsing of dishes may be attached to the outer surface of the right wall (27) of the exemplary tub (20).

[0149] Additionally, a water softening device (72) for softening the washing water to be supplied to the sump (41) may be placed adjacent to the water jacket (71) and below the lower wall (25) of the tub (20).

[0150] Considering the positional constraints in which the water jacket (71) and the water softening device (72) are placed as described above, it is preferable that the heat pump module (100) be configured to be inserted and removed at a location that minimizes interference with the water jacket (71) and the water softening device (72).

[0151] To this end, for example, the heat pump module (100) may be configured to be inserted and removed from the open left wall (94) of the base (90).

[0152] FIG. 6 illustrates an exemplary modular structure of a heat pump module (100) according to the present invention.

[0153] First, the heat pump module (100) according to the present invention may include a compressor (110) that compresses the refrigerant and discharges the refrigerant in a high temperature and high pressure state.

[0154] As described, the compressor (110) constituting the heat pump module (100) may be an electric compressor in which a compression section for compressing a gaseous refrigerant and a motor section for generating rotational driving force to be provided to the compression section are integrated.

[0155] For example, the compressor (110) can be placed on the module base (160) in an upright position where the rotation axis is aligned parallel to the up and down direction (UD direction).

[0156] A fastening tab in the form of a flange may be provided at the bottom of the compressor body (111) of the compressor (110) so that it can be installed and fixed to the module base (160) in an upright state.

[0157] The fastening tab (112) of the compressor (110) can be firmly fastened to the fastening boss (164) of the base plate (161) through a fastening means such as a screw bolt.

[0158] In order to reduce vibration or noise generated in the compressor (110), a bumper having a certain elasticity may be provided between the fastening tab (112) and the fastening boss.

[0159] Meanwhile, the compressor (110) can be positioned as close as possible to the intake port of the heat exchange duct (170) in the space formed between the blower module (180) and the main control panel (210) that is accommodated in the heat exchange duct (170).

[0160] Through this, the compressor (110) can be exposed to the airflow entering the intake port of the heat exchange duct (170), and the cooling effect on the compressor (110) can be improved.

[0161] Meanwhile, the heat pump module (100) may include a condenser (120) that performs heat exchange between the refrigerant and the washing water.

[0162] For example, the condenser (120) constituting the heat pump module (100) may be provided in the form of a double pipe in which the flow path of the washing water and the flow path of the refrigerant are formed together inside.

[0163] In order to effectively form a flow path for the washing water and a flow path for the refrigerant inside, the condenser (120) can be configured to have a cylindrical shape.

[0164] In addition, so that the condenser (120) can be effectively and efficiently placed in the receiving space of the base (90) which is subject to height constraints in the vertical direction (UD direction), the left-right direction (Le-Ri direction) can be arranged and combined with the base (90) such that the length direction is the horizontal direction.

[0165] Meanwhile, the condenser (120) having a cylindrical shape may be configured as a segmented body that is divided along the longitudinal direction, for example.

[0166] More specifically, the condenser (120) composed of a divided body may include a first body (121) in which an inlet pipe (123) into which washing water to be heated is introduced is formed.

[0167] As illustrated by example, the inlet pipe (123) can be integrally formed on the outer surface of the first body (121).

[0168] Additionally, the condenser (120) composed of a divided body may include a second body (122) in which an outlet pipe (124) through which heated washing water is discharged is formed.

[0169] As illustrated by example, the outlet pipe (124) can be integrally formed on the outer surface of the second body (122).

[0170] Although not shown, a washing water pipe (190) can be connected to each of the inlet pipe (123) and the outlet pipe (124).

[0171] For example, one end of the first washing water pipe (191) can be connected to the inlet pipe (123) of the first body (121).

[0172] The other end of the first washing water pipe (191) can be connected to the inlet or outlet end of the washing pump (45) described above.

[0173] That is, the washing water before being pressurized by the washing pump (45) or the washing water pressurized by the washing pump (45) can be introduced into the condenser (120) through the other end of the first washing water pipe (191).

[0174] As the condenser (120) is connected downstream of the washing pump (45), washing water pressurized by the washing pump (45) can be introduced into the inlet pipe (123) of the first body (121) through the first washing water pipe (191).

[0175] Additionally, as an example, one end of the second washing water pipe (192) may be connected to the outlet pipe (124) of the second body (122).

[0176] The other end of the second washing water pipe (192) can be connected to the aforementioned supply flow switching valve (465).

[0177] Therefore, heated washing water can be delivered to the spray section through the second washing water pipe (192) via the supply flow switching valve (465).

[0178] Meanwhile, to increase the heating efficiency or heat exchange efficiency for the washing water, the outlet pipe (124) and the inlet pipe (123) of the condenser (120) may be positioned as far apart as possible along the longitudinal direction of the condenser (120).

[0179] To this end, based on the illustrated state, the inlet pipe (123) of the condenser (120) can be positioned as close as possible to the front end of the first body (121).

[0180] Additionally, the outlet pipe (124) of the condenser (120) can be positioned as close as possible to the rear end of the second body (122).

[0181] Meanwhile, a condenser refrigerant pipe may be introduced inside the first body (121) and the second body (122) of the condenser (120) to convert the gaseous refrigerant into a liquid refrigerant.

[0182] For example, the condenser refrigerant tube can be introduced into the interior of the condenser (120) through the front end of the first body (121).

[0183] The condenser refrigerant tube introduced into the interior of the condenser (120) may be formed to have a multilayer structure formed by bending multiple times or a coil structure wound multiple times in order to increase the heating efficiency or heat exchange efficiency for the cleaning water.

[0184] Meanwhile, as illustrated, the condenser (120) can be positioned in front of the sump (41) and the wash pump (45) based on the forward direction (FR direction).

[0185] Meanwhile, the heat pump module (100) may include an evaporator (130) into which refrigerant that has passed through a condenser (120) is introduced and in which the liquid refrigerant undergoes a phase change to a gaseous state.

[0186] As described above, the evaporator (130) is configured to undergo a phase change while exchanging heat with the airflow generated through the receiving space of the base (90).

[0187] Accordingly, similar to the condenser refrigerant tube, the evaporator (130) can be formed into a multi-row structure and a multi-layer structure formed by bending the evaporator refrigerant tube multiple times.

[0188] Through this, the heat exchange surface area for the airflow to be heat-exchanged can be maximized.

[0189] Meanwhile, the evaporator refrigerant pipe of the evaporator (130) can be configured to exchange heat with the internal air of the receiving space of the base (90) or with the external air introduced from the outside of the base (90).

[0190] FIG. 6 illustrates an exemplary embodiment in which the evaporator refrigerant pipe of the evaporator (130) is configured to exchange heat with the internal air of the receiving space of the base (90).

[0191] That is, the internal air of the receiving space of the base (90) can be exhausted to the outside of the base (90) after being heat-exchanged with the evaporator refrigerant pipe and heat exchange fin of the evaporator (130).

[0192] Meanwhile, when the evaporator refrigerant pipe and heat exchange fin of the evaporator (130) exchange heat with the internal air of the base (90), a flow path or passage needs to be formed so that the heat-exchanged air is discharged to the outside.

[0193] In this way, internal air needs to be positioned through the evaporator refrigerant pipe of the evaporator (130) and the shortest external path of the base (90).

[0194] To this end, the evaporator refrigerant tube of the evaporator (130) can be positioned as close as possible to the rear wall (93) of the base (90).

[0195] Meanwhile, to maximize the heat exchange efficiency for the internal air of the base (90), the evaporator refrigerant pipe of the evaporator (130) can be accommodated inside the duct body (171) of the heat exchange duct (170) which forms a heat exchange path or heat exchange passage.

[0196] Accordingly, the duct body (171) of the heat exchange duct (170), with the evaporator refrigerant tube and heat exchange fins housed inside, can be positioned as close as possible to the rear wall (93) of the base (90).

[0197] Corresponding to the duct body (171), an outlet may be formed through the rear wall (93) of the base (90) between a pair of column sections (9311).

[0198] The airflow that has undergone heat exchange while passing through the duct body (171) can be smoothly exhausted to the outside of the base (90) by passing through the outlet. Meanwhile, a blower module (180) that generates an airflow to be heat-exchanged by accelerating the evaporator refrigerant pipe of the evaporator (130) and the internal air of the base (90) may be disposed inside the duct body (171).

[0199] In this case, for example, the blower module (180) may be configured to include only a single blower fan (181) and a single blower motor (182). Through this, the increase in volume of the heat exchange duct (170) and the amount of noise generated by the blower fan (181) can be suppressed to the maximum extent.

[0200] Meanwhile, the heat pump module (100) may include an expansion valve (140) disposed between the second pipe (152) and the third pipe (153).

[0201] In the illustrated embodiment, the expansion valve (140) may be positioned in front of the compressor (110) at a location where interference with the aforementioned compressor (110) and condenser (120) can be minimized.

[0202] Meanwhile, the heat pump module (100) may include a module base (160) that supports the aforementioned compressor (110), condenser (120), evaporator (130), and refrigerant piping (150) installed collectively.

[0203] More specifically, as illustrated, the module base (160) may include a plate-shaped base plate (161).

[0204] A compressor (110) and an evaporator (130) can be fixed collectively on the upper side of the base plate (161), and a compressor (110) and an evaporator (130) can be supported collectively.

[0205] As described above, a plurality of fastening bosses may be integrally formed on the upper surface of the base plate (161) so that the compressor (110) and the evaporator (130) can each be individually fastened and supported.

[0206] The heat pump module (100) is configured so that the compressor (110) and evaporator (130), etc., are fixed collectively to the module base (160) and are collectively inserted and removed from the base (90).

[0207] Additionally, a main control panel (210) that functions as a control unit (200) described later can be detachably disposed on the left wall (94) of the base (90).

[0208] The main control panel (210) controls the operation of electrical components by intermittently supplying power to electrical components such as a cleaning pump (45), a compressor (110), a blower motor (182), etc.

[0209] Therefore, in order to minimize the influence from the water jacket (71), water softener (72), sump (41), and wash pump (45) which may leak, the main control panel (210) may be placed on the left wall (94) of the base (90) at a location as far away from them as possible.

[0210] To this end, as shown in FIG. 6, the main control panel (210) can be arranged along the edge of the left wall (94) of the base (90).

[0211] In addition, to minimize damage caused by leakage, the main control panel (210) may be positioned at a location spaced upward (U-direction) from the bottom surface (91) of the base (90).

[0212] However, the heat pump module (100) of the present invention may be configured to be inserted and removed through the left wall (94) of the base (90) where the main control panel (210) is installed.

[0213] Accordingly, considering that the main control panel (210) is positioned to block the inflow and outflow of the heat pump module (100), the main control panel (210) can be configured to be at least partially mounted on the module base (160) and at least partially supported by the module base (160).

[0214] A pair of installation ribs may be provided on the module base (160) as a means for supporting and fixing the main control panel (210).

[0215] Meanwhile, the lower surface of the base plate (161) of the module base (160) can be placed on the base (90) in a state of surface contact with the bottom surface (91) of the base (90) as a whole.

[0216] A seating surface may be formed on the bottom surface (91) of the base (90) to which the base plate (161) is joined in a surface contact state.

[0217] The mounting surface of the base (90) may have a shape corresponding to the shape of the base plate (161) of the module base (160) and an area corresponding to the area of ​​the base plate (161) of the module base (160).

[0218] Meanwhile, a guide rib (911) that protrudes along the upward direction (U-direction) from the bottom surface (91) may be integrally formed on the bottom surface (91) of the base (90).

[0219] As shown in FIG. 6, the guide rib (911) can be extended along the outer edge of the base plate (161) of the module base (160).

[0220] Additionally, the guide rib (911) may be provided in a barrier shape to have a shape corresponding to the outer edge of the base plate (161).

[0221] Therefore, the mounting position of the heat pump module (100) can be effectively guided by the guide rib (911) of the base (90).

[0222] In addition, the heat pump module (100) can be effectively prevented from moving out of its proper position by the guide rib (911) of the base (90).

[0223] In addition, the direction of movement of the heat pump module (100) can be effectively guided by the guide rib (911) of the base (90) when moving horizontally in the left-right direction (Le-Ri direction) for mounting and removing the heat pump module (100).

[0224] [Piping connection structure between heat pump unit and tub]

[0225] The connection structure of the piping and duct between the heat pump module (100) and the tub (2) according to an embodiment of the present invention will be described in detail below with reference to FIG. 7.

[0226] As described above, the condenser (120) can operate as a heat exchanger or heat source that heats the washing water by transferring heat from the refrigerant to the washing water during the washing process (S2) and the heating and rinsing process (S4).

[0227] That is, the condenser (120) of the heat pump module (100) according to one embodiment of the present invention may be configured to act as a heat source for washing water, either together with or alone with the washing water heater (48), as described below, during the progress of the washing process (S2) and the heating and rinsing process (S4).

[0228] As described above, in order to form an effective heat exchange structure between the refrigerant and the washing water, the condenser (120) may be provided in the form of a double tube in which the flow path of the washing water and the flow path of the refrigerant are formed together inside.

[0229] Additionally, the condenser (120) may be composed of a segmented body that is divided along the longitudinal direction.

[0230] Additionally, the condenser (120) composed of a divided body may include a first body (121) in which an inlet pipe (123) into which washing water to be heated is introduced is formed.

[0231] Additionally, the condenser (120) composed of a divided body may include a second body (122) in which an outlet pipe (124) through which heated washing water is discharged is formed.

[0232] Washing water pipes (190) can be connected to the inlet pipe (123) and the outlet pipe (124), respectively.

[0233] One end of the first washing water pipe (191) can be connected to the inlet pipe (123) of the first body (121).

[0234] The other end of the first washing water pipe (191) can be connected to the inlet or outlet end of the washing pump (45) described above.

[0235] That is, the washing water before being pressurized by the washing pump (45) or the washing water pressurized by the washing pump (45) can be introduced into the condenser (120) through the other end of the first washing water pipe (191).

[0236] As the condenser (120) is connected downstream of the washing pump (45), washing water pressurized by the washing pump (45) can be introduced into the inlet pipe (123) of the first body (121) through the first washing water pipe (191).

[0237] Additionally, as an example, one end of the second washing water pipe (192) may be connected to the outlet pipe (124) of the second body (122).

[0238] The other end of the second washing water pipe (192) can be connected to the aforementioned supply flow switching valve (465).

[0239] Therefore, heated washing water can be delivered to the spraying unit (60) via the second washing water pipe (192) and the supply flow switching valve (465).

[0240] High-temperature washing water delivered to the spraying unit (60) is sprayed toward the tableware contained inside the tub (20), thereby allowing washing and rinsing of the tableware to proceed.

[0241] Wash water used for washing or rinsing dishes can fall down from the tub (2) and be recirculated into the sump (4).

[0242] The washing water flowing into the sump (4) can be recirculated to the washing pump (45).

[0243] The washing water that has been recirculated to the washing pump (45) is pressurized by the washing pump (45), and the pressurized washing water can be transferred to the inlet pipe (123) of the condenser (120) through the first washing water pipe (191).

[0244] The cleaning water introduced into the interior of the condenser (120) through the inlet pipe (123) can be reheated while exchanging heat with the condenser refrigerant pipe.

[0245] Through this washing water circulation process, heated washing water can be used for washing and rinsing dishes, and washing water whose temperature has dropped below an appropriate level during the washing and rinsing process can be transferred back to the washing water heater (48) or condenser (120) to be reheated.

[0246] At this time, according to the heating mode selected from a plurality of washing water heating modes, the washing water heater (48) and the condenser (120) of the heat pump module (100) may be configured to operate as a single heating source to heat the washing water, or to operate simultaneously to heat the washing water.

[0247] In addition, the present invention may be configured to switch to another heating mode according to the user's will while heating the washing water, with a specific heating mode selected among a plurality of washing water heating modes.

[0248] Detailed configurations of a plurality of washing water heating modes according to an embodiment of the present invention will be described later with reference to FIGS. 9 to 11.

[0249] [Configuration of the control unit and method of controlling the dishwasher]

[0250] Hereinafter, with reference to FIG. 8, the configuration of the control unit (200) constituting the dishwasher (1) according to an embodiment of the present invention will be described.

[0251] As illustrated in FIG. 8, a dishwasher (1) according to one embodiment of the present invention may include a control unit (200) for controlling each function configuration.

[0252] The control unit (200) may be provided in various forms, such as a microcontroller, a microcomputer, a control panel, or a microprocessor, as is known in the art.

[0253] First, the control unit (200) can be electrically connected to the button unit (34) into which the user's operation command is input.

[0254] When a user's power on / off operation input, and a washing course selection operation or an option selection operation are input through the button unit (34), the button unit (34) can transmit a corresponding electrical signal to the control unit (200).

[0255] The control unit (200) can control the dishwasher (1) so that when an electrical signal from the button unit (34) is received, the power of the dishwasher (1) is turned on and off, or individual operations of the dishwasher (1) are performed according to the selected washing course and selected operating mode.

[0256] In particular, the operating mode may include a plurality of washing water heating modes performed during the washing process (S2) and the heating and rinsing process (S4) as described below.

[0257] Although not shown, the user's operation command may be configured to be input through other input means, such as the user's wireless terminal, in addition to the button part (34).

[0258] Additionally, the control unit (200) can be electrically connected to the washing pump (45).

[0259] The control unit (200) can turn on the washing pump (45) so that the operation of the dishwasher (1) can proceed according to the selected washing course and selected heating mode when an operation command regarding the selection of a washing course and a heating mode is input from the button unit (34).

[0260] When the washing pump (45) is turned on, the supply and circulation of washing water for washing or rinsing dishes can be initiated.

[0261] When the washing process (S2) and the heating and rinsing process (S4) are performed, at least one of the heat pump module (100) or the washing water heater (48) is selected as a heating source according to the heating mode along with the operation of the washing pump (45), so that heating of the washing water can be performed.

[0262] As described below, the control unit (200) can turn off the washing pump (45) by cutting off the power supply to the washing pump (45) when the washing water temperature reaches a preset first target temperature (T1) from the initial temperature (T0) after the washing pump (45) is turned on and the supply of washing water begins.

[0263] At this time, even after reaching the first target temperature (T1), the heating of the washing water by the heat pump module (100) or the washing water heater (48) may continue to proceed, and the steam generation process may proceed.

[0264] Additionally, the control unit (200) can be electrically connected to the washing water heater (48).

[0265] As described below, a dishwasher (1) according to one embodiment of the present invention is configured such that, during the progress of a washing process (S2) or a heating and rinsing process (S4), the washing water is heated through at least one of a condenser (120) of a heat pump module (100) or a washing water heater (48).

[0266] As described below, the washing water is configured to be heated using at least one of the washing water heater (48) and the heat pump module (100) depending on the selection of the washing water heating mode.

[0267] At this time, the washing water heater (48) may be configured as an electric heater having a higher heat output than the condenser (120) of the heat pump module (100).

[0268] For example, the washing water heater (48) may include a sheathe heater that has excellent heating efficiency and easy control of the amount of heat.

[0269] Accordingly, as described below, a washing water heater (48) can be used alone or combined with a heat pump module (100) as a heating source to shorten the heating time to the first target temperature (T1) or the second target temperature (T2).

[0270] Additionally, the control unit (200) can be electrically connected directly or indirectly to the heat pump module (100) that heats the washing water.

[0271] More specifically, the control unit (200) can be electrically connected to the compressor (110) and the blower motor (182) of the blower module (180) to control the operation of the heat pump module (100).

[0272] The control unit (200) can turn on or turn off the compressor (110) and the blower motor (182) by interrupting the power supplied to the compressor (110) and the blower motor (182) to heat the washing water during the washing process (S2) or the heating and rinsing process (S4).

[0273] At this time, in order to increase the heating efficiency of the washing water and ensure the heat exchange effect of the refrigerant, the control unit (200) can turn on the compressor (110) and the blower motor (182) at the same time and turn them off at the same time, respectively.

[0274] Meanwhile, the control unit (200) can be electrically connected to the temperature sensor (ST).

[0275] The temperature sensor (ST) has the purpose of measuring the temperature of the washing water and can generate an electrical signal containing information regarding the washing water temperature and transmit it to the control unit (200).

[0276] To this end, a temperature sensor (ST) may be placed on a washing pump (45), a tub (20), a sump (41), or a washing water supply path.

[0277] As described below, the control unit (200) can determine whether the washing water temperature reaches the first target temperature (T1) and the second target temperature (T2) from the initial temperature (T0) based on the electrical signal received from the temperature sensor (ST).

[0278] Meanwhile, the control unit (200) may be electrically connected to a memory and a timer. The control unit (200) may recall operating conditions, temperature conditions, and time conditions, etc., that are pre-stored in the memory for each washing course and each heating mode, and use them to generate a control signal for controlling the progress and termination of the process according to the washing course.

[0279] The operation parameters of each component of the dishwasher (1) are set in the memory to be described later, according to selection options such as adding or excluding specific washing courses and specific operations that the user can select, such as by pressing a button through the control panel (32) or a wireless terminal.

[0280] Operation parameters such as the operating time, power supply level, power intensity, on / off conditions, and washing water flow rate of components such as the heat pump module (100), washing pump (45), washing water heater (47), and water supply unit (43) of the dishwasher (1) can be set, and a set of operation parameters that proceed according to each washing course can be defined as an operating mode.

[0281] Therefore, the washing course may refer to the name of the operating mode of the dishwasher (1) displayed on the display (33) of the dishwasher (1) or on the screen of the wireless terminal.

[0282] That is, the user selects a washing course, and the control unit (200) of the dishwasher (1) can control the individual components of the dishwasher (1) to sequentially proceed with the operation mode corresponding to the washing course.

[0283] Therefore, although the washing course and operating mode have been distinguished in this invention for specific explanation, they may have similar meanings.

[0284] The cleaning course can be set in various ways, such as general course, standard course, heavy course, delicate course, half course, automatic course (half load course, cleaning concentrated on only some of the racks), shortened course, 1 hour course, and night course (quiet course).

[0285] The labeling of the cleaning course names may vary slightly depending on the product. In particular, the 1-hour course operates for 1 hour or less, but in some cases, it may operate for 2 hours or less.

[0286] That is, when a user selects a washing course, the control unit (200) determines the operating mode of the dishwasher (1) corresponding to each washing course, and each operating mode can proceed with the corresponding washing course according to preset parameters.

[0287] In particular, as described below, the heating mode of the dishwasher (1) may include a standard (general) mode in which the washing water is heated by sequentially using a heat pump module (100) and a washing water heater (48) as a heating source during the washing process (S2) or the heating and rinsing process (S4).

[0288] Additionally, the heating mode of the dishwasher (1) may include an energy-saving mode in which the washing water is heated using a heat pump module (100) as a heating source during the washing process (S2) or the heating and rinsing process (S4).

[0289] Additionally, the heating mode of the dishwasher (1) may include a rapid mode in which the washing water is heated using both the heat pump module (100) and the washing water heater (48) as heating sources during the washing process (S2) or the heating and rinsing process (S4).

[0290] FIG. 9 discloses exemplary operating conditions of a cleaning pump (45) and a heat pump module (100) that proceed according to the standard (general) mode among a plurality of heating modes according to the first embodiment.

[0291] As illustrated in FIG. 9, when a washing process (S2) or a heating and rinsing process (S4) is initiated, the control unit (200) can turn on the washing pump (45) to supply and circulate the washing water.

[0292] At this time, the control unit (200) can turn on the heat pump module (100) by supplying power to the compressor (110) and the blower module (180) of the heat pump module (100) at the same time as the cleaning pump (45) is turned on or immediately after the cleaning pump (45) is turned on.

[0293] At this time, the control unit (200) can cut off the power supply to the washing water heater (48) so that the washing water heater (48) remains in a turned-off state.

[0294] Therefore, in standard (general) mode, the washing water can be heated only through the condenser (120) of the heat pump module (100).

[0295] In this way, while heating is performed only through the condenser (120) of the heat pump module (100), the control unit (200) can check whether the washing water temperature reaches the first target temperature (T1) from the initial temperature (T0) through the temperature sensor (ST).

[0296] Here, the first target temperature (T1) can be a temperature suitable for smooth washing and rinsing of tableware.

[0297] For example, the first target temperature (T1) can be a temperature within a numerical range of 50°C or higher and 70°C or lower.

[0298] When the washing water temperature reaches the first target temperature (T1), the control unit (200) can turn off the heat pump module (100) by cutting off the power supply to the heat pump module (100).

[0299] Through this, heating of the wash water can be stopped.

[0300] However, as described below, a dishwasher (1) according to one embodiment of the present invention may be configured to generate steam by additionally heating the washing water.

[0301] Therefore, if the selected washing course includes a steam generation option, the control unit (200) can turn on the washing water heater (48) by starting power supply to the washing water heater (48) so that the washing water can be additionally heated.

[0302] At this time, the power supply to the heat pump module (100) is cut off so that the heat pump module (100) can be kept in a turned-off state.

[0303] In this way, while heating is performed only through the washing water heater (48), the control unit (200) can check whether the washing water temperature reaches the second target temperature (T2) through the temperature sensor (ST).

[0304] Here, the second target temperature (T2) can be the steam generation temperature.

[0305] For example, the second target temperature (T2) can be set to 100°C at which steam generation begins.

[0306] When the washing water temperature reaches the second target temperature (T2), the control unit (200) can turn off the washing water heater (48) by cutting off the power supply to the washing water heater (48) in order to end the steam generation process after a preset time has elapsed.

[0307] That is, in standard (general) mode, the heat pump module (100) is used as a heating source up to the first target temperature (T1), and the washing water heater (48) can be used as a heating source from the first target temperature (T1) to the second target temperature (T2).

[0308] Therefore, the standard (general) mode may be a heating mode in which the time (t1) to reach the first target temperature (T1) may be slightly delayed but power consumption may be reduced, and the time (t2) to reach the second target temperature (T2) may be shortened but power consumption may be slightly increased.

[0309] FIG. 10 discloses exemplary operating conditions of a cleaning pump (45) and a heat pump module (100) that proceed according to an energy-saving mode among a plurality of heating modes according to a second embodiment.

[0310] As illustrated in FIG. 10, when a washing process (S2) or a heating and rinsing process (S4) is initiated, the control unit (200) can turn on the washing pump (45) for supplying and circulating washing water.

[0311] At this time, the control unit (200) can turn on the heat pump module (100) by supplying power to the compressor (110) and the blower module (180) of the heat pump module (100) at the same time as the cleaning pump (45) is turned on or immediately after the cleaning pump (45) is turned on.

[0312] At this time, similar to the first embodiment, the control unit (200) can cut off the power supply to the washing water heater (48) so that the washing water heater (48) remains in a turned-off state.

[0313] Therefore, in energy-saving mode, the washing water can be heated only through the condenser (120) of the heat pump module (100).

[0314] In this way, while heating is performed only through the condenser (120) of the heat pump module (100), the control unit (200) can check whether the washing water temperature reaches the first target temperature (T1) from the initial temperature (T0) through the temperature sensor (ST).

[0315] Here, as in the first embodiment, the first target temperature (T1) can be a temperature suitable for smooth washing and rinsing of tableware.

[0316] When the washing water temperature reaches the first target temperature (T1), the control unit (200) can turn off the heat pump module (100) by cutting off the power supply to the heat pump module (100).

[0317] Through this, heating of the wash water can be stopped.

[0318] However, if the selected washing course includes a steam generation option, the control unit (200) can turn on the heat pump module (100) by resuming power supply to the heat pump module (100) so that the washing water can be additionally heated.

[0319] At this time, the power supply to the washing water heater (48) is cut off so that the washing water heater (48) can be kept in a turned-off state.

[0320] In this way, while heating is being done only through the heat pump module (100), the control unit (200) can check whether the washing water temperature reaches the second target temperature (T2) through the temperature sensor (ST).

[0321] Here, as in the first embodiment, the second target temperature (T2) can be the steam generation temperature.

[0322] When the washing water temperature reaches the second target temperature (T2), the control unit (200) can turn off the heat pump module (100) by cutting off the power supply to the heat pump module (100) in order to terminate the steam generation process after a preset time has elapsed.

[0323] That is, in energy saving mode, the heat pump module (100) can be used as a heating source up to the first target temperature (T1) and from the first target temperature (T1) to the second target temperature (T2).

[0324] Therefore, compared to the standard (general) mode, the energy-saving mode may be a heating mode in which the time (t3) to reach the second target temperature (T2) may be slightly delayed, but the overall power consumption can be reduced.

[0325] FIG. 11 discloses exemplary operating conditions of a cleaning pump (45) and a heat pump module (100) that proceed according to a rapid mode among a plurality of heating modes according to a third embodiment.

[0326] As illustrated in FIG. 11, when a washing process (S2) or a heating and rinsing process (S4) is initiated in the same manner as in the aforementioned embodiments, the control unit (200) can turn on the washing pump (45) for supplying and circulating washing water.

[0327] At this time, the control unit (200) can turn on the heat pump module (100) by supplying power to the compressor (110) and the blower module (180) of the heat pump module (100) at the same time as the cleaning pump (45) is turned on or immediately after the cleaning pump (45) is turned on.

[0328] In addition, as the heat pump module (100) is turned on, the control unit (200) can supply power to the washing water heater (48) to turn on the washing water heater (48).

[0329] Here, the meaning of being turned on simultaneously means that power supply is initiated at the same time physically, and it can also be used as a concept that includes cases where there is a slight difference in the timing of power supply.

[0330] Therefore, in rapid mode, the washing water can be heated simultaneously through the condenser (120) of the heat pump module (100) and the washing water heater (48).

[0331] In this way, while heating simultaneously through the condenser (120) and the washing water heater (48) of the heat pump module (100), the control unit (200) can check whether the washing water temperature reaches the first target temperature (T1) from the initial temperature (T0) through the temperature sensor (ST).

[0332] Here, as in the embodiments described above, the first target temperature (T1) can be a temperature suitable for smooth washing and rinsing of tableware.

[0333] When the washing water temperature reaches the first target temperature (T1), the control unit (200) can turn off the heat pump module (100) and the washing water heater (48) simultaneously by cutting off the power supply to the heat pump module (100) and the washing water heater (48), respectively.

[0334] Through this, heating of the wash water can be stopped.

[0335] However, if the selected washing course includes a steam generation option, the control unit (200) can restart the power supply to the heat pump module (100) and the washing water heater (48) so that the washing water can be additionally heated, thereby turning on the heat pump module (100) and the washing water heater (48) simultaneously.

[0336] In this way, while heating is being done through the heat pump module (100) and the washing water heater (48), the control unit (200) can check whether the washing water temperature reaches the second target temperature (T2) through the temperature sensor (ST).

[0337] Here, as in the embodiments described above, the second target temperature (T2) can be the steam generation temperature.

[0338] When the washing water temperature reaches the second target temperature (T2), the control unit (200) can turn off the heat pump module (100) and the washing water heater (48) simultaneously by cutting off the power supply to the heat pump module (100) and the washing water heater (48) in order to terminate the steam generation process after a preset time has elapsed.

[0339] That is, in rapid mode, the heat pump module (100) and the washing water heater (48) can be used together and simultaneously as heating sources up to the first target temperature (T1) and from the first target temperature (T1) to the second target temperature (T2).

[0340] Therefore, compared to the aforementioned standard (general) mode and energy-saving mode, the rapid mode can be a heating mode in which the time (t1) to reach the second target temperature (T2) can be significantly shortened, but the overall power consumption can be significantly increased.

[0341] In addition, although not illustrated, the dishwasher according to the present invention may be configured to be capable of switching to any one of the other single heating modes by user selection while the heating of the wash water is in progress in any one of the aforementioned standard (general) mode, energy-saving mode, and rapid mode.

[0342] In this way, when the heating of the washing water is switched to another heating mode while heating is in progress in a specific heating mode, this can be referred to as a combined heating mode.

[0343] Meanwhile, additional options can be set for each wash course. These options may include setting the drying cycle time, whether to operate the storage mode after the entire cycle or as a separate course, and turning notifications on or off.

[0344] In addition, as mentioned above, the option may further include a steam generation option.

[0345] Furthermore, the control unit (200) can measure the elapsed time for each administration using a timer and, by comparing it with the time conditions for each administration stored in advance, determine whether each administration is completed and whether the operation of the washing pump (45), heat pump module (100), and washing water heater (48), etc., is stopped.

[0346] Here, each administration may include a pre-washing administration (S1), a washing administration (S2), a rinsing administration (S3), a heating and rinsing administration (S4), and a drying administration (S5), as shown in FIG. 12.

[0347] Hereinafter, a control method for a dishwasher (1) according to the present invention will be explained with reference to FIGS. 13 to 17.

[0348] As illustrated in FIG. 13, the control unit (200) generally controls the progress of the washing course of the dishwasher (1), which proceeds in the order of, for example, a pre-washing course (S1), a washing course (S2), a rinsing course (S3), a heating rinsing course (S4), and a drying course (S5).

[0349] The pre-washing process (S1) is a process of circulating washing water by driving the washing pump (45) without administering detergent through the detergent supply device and measuring the amount of contamination through a turbidity sensor (not shown) provided in the sump (41), and the washing process (S2) is a process of washing dishes by circulating heated washing water with detergent administered through the detergent supply device.

[0350] In the rinsing process (S3) and the heating rinsing process (S4), rinse is administered from the detergent supply device to circulate washing water and remove residual detergent from the dishes.

[0351] When the rinsing process (S3) and the heating rinsing process (S4) are performed, heated washing water is supplied so that the tableware can be heated to a predetermined temperature.

[0352] Through this, the drying efficiency of the tableware can be improved and the drying time can be shortened during the drying process (S5) to be performed after the completion of the rinsing process (S3) and the heating rinsing process (S4).

[0353] Each of these detailed procedures can be combined and adjusted to be omitted or performed redundantly, depending on the selected washing course settings and options.

[0354] At this time, between each administration, a drainage administration for the washing water used during each administration and a water supply administration for supplying new washing water may be included.

[0355] Water supply administration may be included before the pre-washing administration (S1).

[0356] Between the pre-washing process (S1) and the washing process (S2), between the washing process (S2) and the rinsing process (S3), and between the heating and rinsing process (S4) and the rinsing process (S3), a drainage process and a water supply process may be performed, and between the heating and rinsing process (S4) and the drying process (S5).

[0357] The water supply process can be carried out by controlling the Aqua Stop (not shown) provided in the water supply unit (43) to supply washing water to the sump (41) through the water supply path, and the drainage process can be carried out by controlling the drainage unit (44) connected to the sump (41) to drain washing water to the outside of the dishwasher (1) through the drainage path.

[0358] At this time, as described above, depending on the user's option selection, a cleaning course consisting of a combination of these detailed procedures or only one of the procedures may be performed.

[0359] FIG. 13 illustrates the steps of a control method for a dishwasher (1) according to the present invention, wherein the control method is performed by a control unit (200) during a washing process (S2) as an example.

[0360] However, the present invention is not limited thereto, and the details described below can be applied almost identically during the heating and rinsing process (S4) in which the supply of washing water and the heating of washing water proceed together.

[0361] As described above, the control unit (200) can perform a step (S21) of checking the washing course and heating mode in progress before the operation of the washing pump (45) to proceed with the washing process (S2).

[0362] More specifically, as illustrated in FIG. 14, the step (S21) of checking the washing course in progress before the start of operation of the washing pump (45) may include the step (S211) of calling information regarding the washing course selected by the user from memory and checking the information regarding the called washing course.

[0363] Additionally, the step (S21) of checking the washing course in progress before the start of operation of the washing pump (45) may include a step (S212) of determining whether the information regarding the washing course called and confirmed in step S211 includes a heating mode selection option.

[0364] Additionally, if it is confirmed whether the washing course and heating mode options selected in step S21 are included, the control unit (200) can perform the step (S22) of selecting a heating source according to a preset washing water heating mode or a selected washing water heating mode to heat the washing water.

[0365] As described above, the heating source may include at least one of the condenser (120) of the heat pump module (100) and the washing water heater (48).

[0366] Figure 14 illustrates the detailed steps of the step (S22) of selecting a heating source to heat the washing water.

[0367] Referring to FIG. 14, if it is determined in the step (S212) of determining whether the heating mode selection option is included in the information regarding the washing course that the heating mode selection option is not included, the control unit (200) can perform the step (S221) of selecting a heating source according to the general mode to heat the washing water.

[0368] That is, for example, if the washing course selected by the user does not include a separate heating mode selection option, the standard (general) mode according to the first embodiment described above can be set to be the basic washing water heating mode.

[0369] The detailed steps of step S221 are described later with reference to FIG. 15.

[0370] Meanwhile, in the step (S212) of determining whether the heating mode selection option is included in the information regarding the washing course, if it is determined that the heating mode selection option is included, the control unit (200) can proceed to the step (S222) of selecting a heating source according to the heating mode selected from the energy saving mode or the rapid mode to heat the washing water.

[0371] That is, the present invention may be configured to proceed with washing water heating according to the second embodiment described above when the user selects the energy saving mode as the washing water heating mode, and to proceed with washing water heating according to the third embodiment described above when the user selects the rapid mode as the washing water heating mode.

[0372] The detailed steps of step S222 will be described later with reference to FIGS. 16 and FIGS. 17.

[0373] Meanwhile, after the step (S222) of selecting a heating source to heat the washing water according to the heating mode selected from the energy saving mode or the rapid mode, the control unit (200) may perform a step (S223) of determining whether an operation signal for changing the washing water heating mode is input by the user through the button unit (34).

[0374] If it is determined that an operation signal for changing the washing water heating mode is input in step S223, the control unit (200) can perform the step (S224) of changing the heating source to heat the washing water in response to the washing water heating mode changed by the user.

[0375] For example, if it is confirmed that a user's operation to change the heating mode to rapid mode is input while the washing water is currently being heated in standard (general) mode, the control unit (200) can change the heating source by supplying power to the washing water heater (48) which is currently in a turned-off state and changing the operating state so that the washing water heater (48) turns on.

[0376] FIG. 15 illustrates the detailed configuration of the step (S221) of selecting a heating source in a general mode to heat the washing water according to the first embodiment.

[0377] Referring to FIG. 15, the control unit (200) can perform the step (S2211) of selecting the heat pump module (100) as a heat source according to the general mode and supplying power to the compressor (110) and the blower motor (182) of the heat pump module (100) to turn on the heat pump module (100).

[0378] At this time, in order to use only the condenser (120) of the heat pump module (100) as a heat source for washing water according to the general mode, the control unit (200) can cut off the power supply to the washing water heater (48) and keep the washing water heater (48) in a turned-off state.

[0379] Therefore, the condenser (120) of the heat pump module (100) can be used as a single heat source.

[0380] When the heat pump module (100) is turned on in step S2211, the control unit (200) can perform step (S2212) of starting power supply to the cleaning pump (45) to turn on the cleaning pump (45).

[0381] Although step S2212 in FIG. 15 is shown as proceeding after step S2211, this is merely illustrative and may be configured so that the cleaning pump (45) is turned on at the same time as the heat pump module (100) is turned on or before the heat pump module (100) is turned on.

[0382] When the washing pump (45) is turned on in step S2212, the control unit (200) can receive a signal from the temperature sensor (ST) and perform a step (S2213) of determining whether the current temperature of the washing water reaches the first target temperature (T1) from the initial temperature (T0).

[0383] As described above, the first target temperature (T1) is a temperature suitable for smooth washing and rinsing of tableware, and may be, for example, a temperature within a numerical range of 50°C or higher and 70°C or lower.

[0384] If it is determined in step S2213 that the temperature of the washing water has reached the first target temperature (T1), the control unit (200) may perform a step (S2214) of determining whether a steam generation option is included in a washing course pre-selected from memory.

[0385] If it is determined in step S2214 that the pre-selected washing course does not include a steam generation option, the control unit (200) can perform step (S2219) of turning off the heat pump module (100) by cutting off the power supply to the heat pump module (100).

[0386] Through this, heating of the wash water can be completed.

[0387] Meanwhile, if it is determined that the pre-selected washing course in step S2214 includes a steam generation option, the control unit (200) can perform the step (S2215) of turning off the washing pump (45) by cutting off the power supply to the washing pump (45).

[0388] FIG. 15 illustrates, by way of example, that the operation of the cleaning pump (45) is completely cut off for steam generation, but this is merely an example and may be configured to limit the power supply to the cleaning pump (45) so that the cleaning pump (45) operates at the lowest RPM for steam generation.

[0389] Through this, the circulation of the washing water can be completely blocked or the amount of washing water circulation can be minimized.

[0390] When the washing pump (45) is turned off in step S2215, the control unit (200) can perform step (S2215) of turning off the heat pump module (100) by cutting off the power supply to the heat pump module (100) and simultaneously starting the power supply to the washing water heater (48) to turn on the washing water heater (48).

[0391] Through this, the heating source of the washing water for steam generation can be switched to a washing water heater (48).

[0392] When the heat pump module (100) is turned off and the wash water heater (48) is turned on in step S2215, the control unit (200) can receive a signal from the temperature sensor (ST) and perform a step (S2217) of determining whether the current temperature of the wash water reaches the second target temperature (T2).

[0393] As described above, the second target temperature (T2) can be a steam generation temperature, and for example, can be set to 100°C at which steam generation begins.

[0394] When it is determined that the temperature of the washing water has reached the second target temperature (T2) in step S2217, the control unit (200) may perform step (S2218) of turning off the washing water heater (48) by cutting off the power supply to the washing water heater (48) after a preset steam generation time has elapsed.

[0395] In this way, as the washing water heater (48) is turned off in step S2218, the steam generation option process according to the general mode can be terminated.

[0396] FIG. 16 illustrates the detailed configuration of the step (S222a) of selecting a heating source in an energy-saving mode to heat the washing water according to the second embodiment.

[0397] Referring to FIG. 16, the control unit (200) can perform the step (S2221a) of selecting the heat pump module (100) as a heat source according to the energy saving mode and supplying power to the compressor (110) and the blower motor (182) of the heat pump module (100) to turn on the heat pump module (100).

[0398] At this time, in order to use only the condenser (120) of the heat pump module (100) as a heat source for washing water according to the energy saving mode, the control unit (200) can cut off the power supply to the washing water heater (48) and keep the washing water heater (48) in a turned-off state.

[0399] Therefore, the condenser (120) of the heat pump module (100) can be used as a single heat source.

[0400] When the heat pump module (100) is turned on in step S2221a, the control unit (200) can perform step (S2222a) of starting power supply to the cleaning pump (45) to turn on the cleaning pump (45).

[0401] Although step S2222a in FIG. 16 is shown as proceeding after step S2221a, this is merely illustrative and may be configured so that the cleaning pump (45) is turned on at the same time as the heat pump module (100) is turned on or before the heat pump module (100) is turned on.

[0402] When the washing pump (45) is turned on in step S2222a, the control unit (200) can receive a signal from the temperature sensor (ST) and perform a step (S2223a) of determining whether the current temperature of the washing water reaches the first target temperature (T1) from the initial temperature (T0).

[0403] As described above, the first target temperature (T1) is a temperature suitable for smooth washing and rinsing of tableware, and may be, for example, a temperature within a numerical range of 50°C or higher and 70°C or lower.

[0404] If it is determined in step S2223a that the temperature of the washing water has reached the first target temperature (T1), the control unit (200) may perform a step (S2224a) of determining whether a steam generation option is included in a washing course pre-selected from memory.

[0405] If it is determined in step S2224a that the pre-selected washing course does not include a steam generation option, the control unit (200) can perform step (S2228a) of turning off the heat pump module (100) by cutting off the power supply to the heat pump module (100).

[0406] Through this, heating of the wash water can be completed.

[0407] Meanwhile, if it is determined that the pre-selected washing course in step S2224a includes a steam generation option, the control unit (200) can perform step (S2225a) of turning off the washing pump (45) by cutting off the power supply to the washing pump (45).

[0408] FIG. 16 illustrates, by way of example, that the operation of the cleaning pump (45) is completely cut off for steam generation, but this is merely an example and may be configured to limit the power supply to the cleaning pump (45) so that the cleaning pump (45) operates at the lowest RPM for steam generation.

[0409] Through this, the circulation of the washing water can be completely blocked or the amount of washing water circulation can be minimized.

[0410] When the cleaning pump (45) is turned off in step S2225a, the control unit (200) can perform step (S2226a) of maintaining the turn-on state of the heat pump module (100) by maintaining the power supply to the heat pump module (100).

[0411] In this case as well, the washing water heater (48) can be kept in a turned-off state so that steam can be generated in the condenser (120) of the heat pump module (100) according to the energy saving mode.

[0412] Next, the control unit (200) can perform a step (S2227a) of receiving a signal from the temperature sensor (ST) and determining whether the current temperature of the washing water reaches the second target temperature (T2).

[0413] As described above, the second target temperature (T2) can be a steam generation temperature, and for example, can be set to 100°C at which steam generation begins.

[0414] If it is determined in step S2227a that the temperature of the washing water has reached the second target temperature (T2), the control unit (200) may perform step (S2228a) of turning off the heat pump module (100) by cutting off the power supply to the heat pump module (100) after a preset steam generation time has elapsed.

[0415] In this way, as the heat pump module (100) is turned off in step S2228a, the steam generation option process according to the energy saving mode can be terminated.

[0416] FIG. 17 illustrates the detailed configuration of the step (S222b) of selecting a heating source in rapid mode to heat the washing water according to the third embodiment.

[0417] Referring to FIG. 17, the control unit (200) can perform the step (S2221b) of selecting the heat pump module (100) and the wash water heater (48) as heating sources according to the rapid mode, supplying power to the compressor (110) and the blower motor (182) of the heat pump module (100) to turn on the heat pump module (100), and simultaneously supplying power to the wash water heater (48) to turn on the wash water heater (48).

[0418] At this time, the control unit (200) can select both the heat pump module (100) and the washing water heater (48) as heating sources according to the rapid mode for shortening the heating time.

[0419] Therefore, a composite heating source in which both the condenser (120) and the washing water heater (48) of the heat pump module (100) are used can be used.

[0420] When the heat pump module (100) and the washing water heater (48) are turned on simultaneously in step S2221b, the control unit (200) can perform step (S2222b) of starting power supply to the washing pump (45) to turn on the washing pump (45).

[0421] Although step S2222b in FIG. 17 is shown as proceeding after step S2221b, this is merely illustrative and may be configured so that the washing pump (45) is turned on at the same time as the heat pump module (100) and washing water heater (48) are turned on, or before the heat pump module (100) and washing water heater (48) are turned on.

[0422] When the washing pump (45) is turned on in step S2222b, the control unit (200) can receive a signal from the temperature sensor (ST) and perform a step (S2223b) of determining whether the current temperature of the washing water reaches the first target temperature (T1) from the initial temperature (T0).

[0423] As described above, the first target temperature (T1) is a temperature suitable for smooth washing and rinsing of tableware, and may be, for example, a temperature within a numerical range of 50°C or higher and 70°C or lower.

[0424] If it is determined in step S2223b that the temperature of the washing water has reached the first target temperature (T1), the control unit (200) may perform a step (S2224b) of determining whether a steam generation option is included in a washing course pre-selected from memory.

[0425] If it is determined in step S2224b that the pre-selected washing course does not include a steam generation option, the control unit (200) can perform step (S2228b) of simultaneously turning off the heat pump module (100) and the washing water heater (48) by cutting off the power supply to the heat pump module (100) and the washing water heater (48).

[0426] Through this, heating of the wash water can be completed.

[0427] Meanwhile, if it is determined that the pre-selected washing course in step S2224b includes a steam generation option, the control unit (200) can perform step (S2225b) of turning off the washing pump (45) by cutting off the power supply to the washing pump (45).

[0428] FIG. 17 illustrates, by way of example, that the operation of the cleaning pump (45) is completely cut off for steam generation, but this is merely an example and may be configured to limit the power supply to the cleaning pump (45) so that the cleaning pump (45) operates at the lowest RPM for steam generation as described above.

[0429] Through this, the circulation of the washing water can be completely blocked or the amount of washing water circulation can be minimized.

[0430] When the washing pump (45) is turned off in step S2225b, the control unit (200) can perform step (S2226b) of maintaining power supply to the heat pump module (100) and the washing water heater (48) so that the heat pump module (100) and the washing water heater (48) each maintain a turned-on state.

[0431] Through this, the heat pump module (100) and the washing water heater (48) can be continuously used as a heat source for washing water to generate steam.

[0432] Next, the control unit (200) can perform a step (S2227b) of receiving a signal from the temperature sensor (ST) and determining whether the current temperature of the washing water reaches the second target temperature (T2).

[0433] As described above, the second target temperature (T2) can be a steam generation temperature, and for example, can be set to 100°C at which steam generation begins.

[0434] When it is determined that the temperature of the washing water has reached the second target temperature (T2) in step S2227b, the control unit (200) may perform step (S2228b) of simultaneously turning off the heat pump module (100) and the washing water heater (48) by cutting off the power supply to the heat pump module (100) and the washing water heater (48) after a preset steam generation time has elapsed.

[0435] In this way, as the washing water heater (48) is turned off in step S2228b, the steam generation option process according to the rapid mode can be terminated.

[0436] Although the present invention has been described above with reference to the illustrated drawings, the present invention is not limited by the embodiments and drawings disclosed in this specification, and it is obvious that various modifications can be made by a person skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration according to the present invention were not explicitly described while describing the embodiments of the present invention above, it is natural to acknowledge that the effects predictable by said configuration should also be recognized. Explanation of the symbols

[0437] 1: Dishwasher 30: Door 20: Tub 90: Bass 48: Wash water heater 100: Heat pump module

Claims

Claim 1 A dishwasher comprising: a tub forming a washing space and accommodating dishes; a sump storing washing water to be supplied to the tub; a washing pump pressurizing washing water to be supplied to the tub; an electric washing water heater heating washing water supplied to the sump; and a heat pump module heating washing water supplied to the sump; wherein, depending on the heating mode for washing water, either the heat pump module or the washing water heater is selected as the heating source for the washing water. Claim 2 A dishwasher according to claim 1, wherein the heating mode is selected from a general mode, an energy-saving mode, and a rapid mode, and while the heating of the washing water is in progress in any one of the heating modes among the general mode, the energy-saving mode, and the rapid mode, it is possible to switch to any one of the remaining heating modes. Claim 3 A dishwasher in which, in the case where the heating mode is the general mode, the heat pump module and the wash water heater are selected as the heating source. Claim 4 A dishwasher according to claim 3, wherein the washing water is heated by the heat pump module and the operation of the washing water heater is stopped until the washing water temperature reaches a first target temperature, and the washing water is heated by the washing water heater and the operation of the heat pump module is stopped until the washing water temperature exceeds the first target temperature and reaches a second target temperature. Claim 5 A dishwasher according to claim 4, wherein the operation of the washing pump is stopped when the washing water temperature reaches the first target temperature. Claim 6 A dishwasher according to claim 2, wherein when the heating mode is the energy-saving mode, the heat pump module is selected as the heating source and the operation of the wash water heater is stopped. Claim 7 A dishwasher in which, in claim 6, the washing water is heated by the heat pump module until the washing water temperature reaches a first target temperature and until the washing water temperature exceeds the first target temperature and reaches a second target temperature. Claim 8 A dishwasher in which the operation of the washing pump is stopped when the washing water temperature reaches the first target temperature in claim 7. Claim 9 A dishwasher in which, in the case where the heating mode is the rapid mode, the heat pump module and the wash water heater are selected as the heating source. Claim 10 In claim 9, a dishwasher in which the washing water is heated by the heat pump module and the washing water heater until the washing water temperature reaches a first target temperature and until the washing water temperature exceeds the first target temperature and reaches a second target temperature. Claim 11 A dishwasher according to claim 10, wherein power supply to the heat pump module and the wash water heater is simultaneously initiated and turned on simultaneously, and when the second target temperature is reached, the power supplied to the heat pump module and the wash water heater is simultaneously cut off and turned off simultaneously. Claim 12 A dishwasher according to claim 10, wherein the operation of the washing pump is stopped when the washing water temperature reaches the first target temperature. Claim 13 A dishwasher in which, in any one of claims 4, 7 and 10, the first target temperature falls within a numerical range of 50℃ or higher and 70℃ or lower. Claim 14 A dishwasher in which, in any one of claims 4, 7 and 10, the second target temperature is the steam generation temperature at which the washing water vaporizes. Claim 15 A dishwasher comprising: a tub forming a washing space and accommodating dishes; a sump storing washing water to be supplied to the tub; a heat pump module for heating washing water supplied to the sump; and an electric washing water heater for heating washing water supplied to the sump; wherein the turn-on status and the turn-on and turn-off timing of the washing water heater are set differently according to the heating mode for the washing water. Claim 16 A dishwasher according to claim 15, wherein the heating mode is selected from a general mode, an energy-saving mode, and a rapid mode, and while the heating of the washing water is in progress in any one of the heating modes among the general mode, the energy-saving mode, and the rapid mode, it is possible to switch to any one of the remaining heating modes. Claim 17 In claim 15, a dishwasher in which the time for the wash water temperature to reach a target temperature is shortened in the order of the energy-saving mode, the normal mode, and the rapid mode. Claim 18 A dishwasher according to claim 16, wherein when the heating mode is the general mode, power is first supplied to the heat pump module and the heat pump module is turned on, and then power is supplied to the wash water heater and the wash water heater is turned on. Claim 19 A dishwasher according to claim 16, wherein when the heating mode is the energy-saving mode, power is first supplied only to the heat pump module so that the washing water is heated only by the heat pump module and the washing water heater is kept in a turned-off state while the washing water is heated. Claim 20 A dishwasher according to claim 16, wherein when the heating mode is the rapid mode, power is supplied simultaneously to the heat pump module and the wash water heater, and the wash water is heated while the heat pump module and the wash water heater are simultaneously turned on.

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