Dishwasher with heat pump

Abstract

The invention provides a dishwasher (2) comprising: a tub (8) for washing articles therein, a basement (6) arranged below the tub (8) and comprising a lower housing (6a) and a top cover element (6b) at least partially covering the lower housing (6a), a heat pump system having a compressor (92), an evaporator (90), an expansion valve (88), a refrigerant flow changing device (86), and a condenser (44), an evaporator tank (94) configured to store a heat exchanging medium and to house at least a portion of the evaporator (90), wherein the evaporator tank (94) is covered and preferably closed by an evaporator tank cover (95), and refrigerant piping fluidly connecting the components of the heat pump system. The compressor (92), the evaporator tank (94), the expansion valve (88) and the refrigerant flow changing device (86) are arranged within the lower housing (6b) of the basement (6), wherein a) the refrigerant flow changing device (86) is a refrigerant circuit component which is arranged in the basement (6) next to the compressor (92), and / or b) the refrigerant flow changing device (86) is arranged in a condensate collection tray (128), and / or c) the evaporator tank cover (95) comprises one or more mounting elements (138, 140) for mounting refrigerant circuit components and / or refrigerant piping elements on the evaporator tank cover (95).

Description

[0001] Dishwasher with heat pump

[0002] The present invention relates to a dishwasher with a heat pump.

[0003] EP 4275 573 Al discloses a dishwasher comprising a heat pump with an evaporator tank covered by an evaporator tank cover, wherein a compressor and a condenser of the heat pump, and a sump and water circulation pump are arranged on the evaporator tank cover.

[0004] It is an object of the invention to provide a dishwasher with an efficient arrangement of the heat pump components and / or having a simplified assembly.

[0005] The invention is defined in the independent claims, respectively. Particular embodiments are set out in the dependent claims.

[0006] According to claim 1, a dishwasher is provided. The dishwasher comprises a tub for washing articles therein, a basement arranged below the tub and comprising a lower housing and a top cover element at least partially covering the lower housing, a heat pump system having a compressor, an evaporator, an expansion valve, a refrigerant flow changing device, and a condenser, an evaporator tank configured to store a heat exchanging medium and to house at least a portion of the evaporator, wherein the evaporator tank is covered and preferably closed by an evaporator tank cover, and refrigerant piping fluidly connecting the components of the heat pump system. The compressor, the evaporator tank, the expansion valve and the refrigerant flow changing device are arranged within the lower housing of the basement, and wherein a) the refrigerant flow changing device is a refrigerant circuit component which is arranged in the basement next to the compressor, and / or b) the refrigerant flow changing device is arranged in a condensate collection tray, and / or c) the evaporator tank cover comprises one or more mounting elements for mounting refrigerant circuit components and / or refrigerant piping elements on the evaporator tank cover.

[0007] The arrangement of the evaporator tank, the evaporator, the compressor, the refrigeration flow changing device and the expansion valve within the lower housing of the basement simplifies the assembly of the dishwasher. In particular, pre-assembly of the basement with the heat pump components arranged therein independently of the dishwashers components arranged above the top cover element of the basement is possible. In particular, as stated below, preferably, the condenser is the sole and only component of the heat pump system supported by the upper frame and / or arranged within the upper cabinet. I.e. all heat pump components (except the condenser and the piping connecting the condenser to the heat pump components in the basement) such as the compressor, the expansion arrangement, the refrigerant flow changing device, the evaporator tank and the refrigerant piping connecting the heat pump components are arranged within the basement. During assembly of the dishwasher, the preassembled basement and pre-assembled upper cabinet of the dishwasher can be easily connected only by connecting of the condenser refrigerant inlet and outlet with the evaporator.

[0008] "A refrigerant circuit component" is an element within the refrigeration circuit that guides the refrigerant. A refrigerant circuit component is not the refrigerant piping. A refrigerant circuit component may be for example the refrigerant flow changing device, the expansion device, the evaporator, the compressor, flow rectifier means such as valves (e.g. non-retum or check valves) and / or filter(s). "Refrigerant circuit component arranged next to the compressor" does not mean refrigerant piping, but an element which is arranged within the refrigerant circuit.

[0009] The condensate collection tray is configured to collect condensate during operation of the dishwasher. The condensate collection tray (described further below) is preferably fluidly separated from the evaporator tank.

[0010] Preferably, the mounting elements comprise protruding elements configured to hold refrigerant circuit components and / or refrigerant piping elements and / or one or more recesses for receiving therein refrigerant circuit components and / or refrigerant piping elements. Specifically the mounting elements provide a mounting site for mechanically fixing the refrigerant pipe(s). This prevents a relative movement of the pipes and the evaporator tank and avoids formation of leaks at passages of the refrigerant pipes into / out of the evaporator tank.

[0011] The evaporator tank cover may comprise apertures through which refrigerant pipes of the heat pump system which are connected to the evaporator housed in the evaporator tank can extend.

[0012] Basement: Preferably, an upper surface of the top cover element is configured to collect a liquid therein or thereon, wherein the dishwasher comprises a leak detector arranged at the upper surface of the top cover element and being adapted to detect an accumulation of liquid at the top cover element. Preferably an upper surface of the top cover element forms a trough configured to collect a liquid therein, wherein a leak detector is arranged within the trough and being configured to detect the presence of liquid collected in the trough.

[0013] Preferably, the dishwasher comprises a control unit, wherein, in response to a signal of the leak detector (i.e. liquid collected at the top cover element exceeds a predefined liquid level which is detected by the leak detector), the control unit is adapted to stop operation of the dishwasher, and in particular to close a water supply valve such that the water supply to the dishwasher is stopped. This can prevent damage to the environment around the dishwasher and further damage to the dishwasher. More preferably, the dishwasher comprises a control unit, wherein, in response to a signal of the leak detector, the control unit is adapted to disconnect the dishwasher from the power mains. Thus, it can be avoided that a user comes into contact with charged water and thus prevent possible injuries to the user.

[0014] The top cover element may cover or may essentially cover the inner space of the basement at the top side. Preferably the top cover element covers the inner space of the basement such that liquid flowing or dripping from above the basement (e.g. from inside the space of the upper frame) is screened against entering into the inner space of the basement.

[0015] The top cover element preferably comprises one or more apertures through which the refrigerant pipes connected to the condenser may extend.

[0016] Preferably, the dishwasher comprises water-guiding components which are supported by an upper frame and / or which are arranged in an upper cabinet of the dishwasher above the top cover element of the basement. Preferably, said water-guiding components is or comprise at least a circulation pump to circulate water into one or more spray devices arranged within the tub and / or a sump for collecting washing liquid from the tub. Preferably all water-guiding components of the dishwasher are supported by the upper frame and / or are arranged in the upper cabinet above the top cover element of the basement. The water-guiding components may be one or more or all of the following: a sump for collecting washing liquid from the tub, a circulation pump, a draining pump, one or more spray devices arranged within the tub, a water diverter and / or distributor (flow manifold or flow controller), a first passage of the condenser for circulating the washing liquid, and water piping connecting the water-guiding components. Thus, as all water guiding components are supported by the upper frame and / or are arranged in the upper cabinet above the basement, the assembly of the dishwasher is simplified. In particular, pre- assembly of the upper frame and all components above the upper frame independently of the basement is possible. Further, if there is any leakage in the water guiding elements, the water collects in the top cover element below (in contrast to an arrangement in which also water guiding elements are arranged in the basement), which means that a leak in the water guiding elements can be detected efficiently with the leak detector.

[0017] The refrigerant flow changing device may be a refrigerant circuit component which is arranged in the basement (i.e. lower housing) next to the compressor and / or next to a refrigerant inlet of the condenser. Preferably, the basement (i.e. lower housing) comprises a first support area adapted to support the evaporator tank, a second support area adapted to support the compressor and a third support area adapted to support the refrigerant flow changing device and / or the expansion valve, and wherein the refrigerant flow changing device and / or the expansion valve and the compressor are arranged on the same side of the evaporator tank.

[0018] Preferably, the lower housing of the basement has outer walls and / or a bottom wall forming a lower cabinet of the dishwasher's cabinet. The bottom wall and / or outer walls may be doublewalled with an air gap in between. Preferably the air gap is air-tight sealed so that no ambient humidity can condensate and collect in the air gap. The bottom wall of the basement may comprise rib elements configured to provide an air gap between the bottom internal surface of the bottom wall and a bottom surface of the evaporator tank and / or an evaporator module (see below).

[0019] Evaporator:

[0020] The evaporator tank is preferably arranged within the lower housing of the basement below the tub. The evaporator tank is preferably a closed tank for permanently storing a heat exchanging medium. Preferably, the evaporator tank is configured such that no or substantially no heat exchange with external components such as the tub of the dishwasher can occur. The evaporator tank may be enclosed by a heat insulating material.

[0021] Preferably, the heat exchanging medium contained in the evaporator tank is adapted to change from a liquid phase to a solid phase and vice versa. In particular, when the heat pump is operated in a normal operation mode (see below), the heat exchanging medium is cooled down and finally changes from the liquid to the solid phase for releasing heat. The heat released by the heat exchanging medium heats the refrigerant flowing through the evaporator which then evaporates. The heated refrigerant as a gas phase is sucked by the compressor and conveyed to the condenser. When the heat pump is operated in a reverse operation mode (see below), the heat exchanging medium is heated up and finally changes from the solid to the liquid phase by absorbing the latent heat required for the phase transition.

[0022] The heat exchanging medium preferably has a liquid / solid transition phase at a temperature such that a liquid to solid transition can be achieved at a temperature of the heat exchanging medium in the evaporator tank during the normal operation mode, and such that a solid to liquid transition can be achieved at a transition temperature of the heat exchanging medium in the evaporator tank during the reverse operation mode. Thereby heat can be extracted or deposited in the heat exchanging medium corresponding to the medium's latent heat. The heat exchanging medium may be water or water mixed with a salt increasing the latent heat and / or shifting the transition temperature, or a paraffin.

[0023] Evaporator Module:

[0024] Preferably, the dishwasher further comprises an evaporator module having a lower module shell configured to support or house the evaporator tank, the refrigerant flow changing device and / or the expansion device (e.g. expansion valve), wherein the evaporator module is arranged within the lower housing of the basement. Preferably, the lower module shell comprises outer walls and a bottom wall.

[0025] Preferably, the lower module shell comprises an extension (or support region) forming a or the condensate collection tray adjacent to the evaporator tank and which is adapted to support the refrigerant flow changing device and / or the expansion device. The condensate collection tray is configured to collect condensate during operation of the dishwasher. The condensate collection tray is preferably fluidly separated from the evaporator tank. Preferably, the condensate collection tray and the evaporator tank at least partially share or have a common side wall. This prevents condensate from collecting outside the evaporator module in the basement and causing damage to the compressor or other components of the dishwasher and / or to the environment in which the dishwasher is installed.

[0026] The evaporator module comprising the evaporator tank (or a lower portion of the evaporator tank) and the condensate collection tray may be formed in a single piece, e.g. by injection molding, preferably fabricated from a plastic material.

[0027] Preferably, the lower module shell is made in a single piece with the lower housing of the basement. Preferably the condensate collection tray is arranged next to the compressor. The condensate collection tray may comprise a first portion extending between the evaporator tank and a side wall (e.g. the rear wall) of the basement and / or a second portion extending between the evaporator tank and the compressor. Preferably, the expansion device is arranged between the compressor and the evaporator tank and in particular in the second portion of the condensate collection tray. Preferably, the refrigerant flow changing device is arranged between a side wall, e.g. the rear wall, of the basement and the evaporator tank and in particular in the first portion of the condensate collection tray.

[0028] Preferably, the condensate collection tray comprises a mounting element for receiving the expansion device. Preferably, a longitudinal axis of the expansion device is vertical or substantially vertical.

[0029] The refrigerant flow changing device may be arranged such that a longitudinal axis of the refrigerant flow changing device is vertical or substantially vertical. Preferably, an air gap is provided between the refrigerant flow changing device and an upper surface of a bottom wall of the condensate collection tray.

[0030] Preferably, the evaporator module and in particular the lower module shell and / or the evaporator tank cover are thermally insulating. The thermal insulation layer may cover an outer surface of the lower module shell and / or the evaporator tank cover.

[0031] The condensate collection tray may be at least at a portion of its surface thermally insulating or is at least partially covered with a thermally insulating layer. Preferably at least a portion of a side wall between the evaporator tank and the condensate collection tray is thermally insulating.

[0032] Preferably, the compressor is arranged within the basement (i.e. lower housing) external to the evaporator module, and in particular external to the condensate collection tray. Thereby the compressor and the evaporator module are vibrationally separated.

[0033] Preferably, the dishwasher comprises cooling means for cooling the compressor, wherein preferably the cooling means are fluidly connected to ambient air for cooling the compressor by exchanging heat with the ambient air.

[0034] The compressor may be arranged adjacent to a rear wall of the dishwasher and / or in or adjacent to a corner of the basement. Preferably, a longitudinal axis of the compressor is arranged parallel or substantially parallel to the rear wall of the dishwasher. Preferably, a refrigerant outlet of the compressor is arranged adjacent to the condensate collection tray and / or is facing the condensate collection tray. A refrigerant inlet of the compressor may face the rear wall of the dishwasher and / or the inlet of the compressor is arranged on a side of the compressor facing away from the evaporator tank.

[0035] Preferably, the evaporator tank and in particular the evaporator module have the shape of an 'L', when looking at the basement from above in the normal operating position of the dishwasher. The evaporator tank and in particular the evaporator module may extend along at least two sides of the compressor.

[0036] Preferably, at least a portion of the evaporator module is arranged between the condenser and the compressor.

[0037] Condenser:

[0038] Preferably the condenser is the sole and only component of the heat pump system supported by the upper frame and / or connected to the upper cabinet. I.e. all heat pump components (except the condenser and the piping connecting the condenser to the heat pump components in the basement) such as the compressor, the expansion arrangement, the refrigerant flow changing device, the evaporator tank and the refrigerant piping connecting the heat pump components are arranged within the basement.

[0039] Preferably, the condenser comprises a first passage for circulating the washing liquid and a second passage for circulating the refrigerant, wherein the first and second passages are in heat-exchanging contact with each other.

[0040] Preferably, the condenser is arranged at a side wall or at the back wall of the tub. Preferably, the condenser is arranged at the outside of the tub between the tub wall and an outer wall of the dishwasher's cabinet. Preferably, the condenser extends in a vertical or substantially vertical plane.

[0041] Preferably, the washing liquid line (first passage) of the condenser is arranged above the sump so that, when the circulation of the washing liquid is stopped, all washing liquid within the condenser goes back to the sump and can be used for washing.

[0042] Preferably, the condenser is supported by the upper frame above the top cover element, and in particular the water piping, which is connecting all water guiding components, extends above the top cover element. In particular, the condenser may be arranged within the cabinet facing the inner side of a cabinet side wall and / or an outer side of the tub. Preferably, when considering the normal operation position of the dishwasher, the condenser is arranged at the right side wall of the cabinet housing.

[0043] The inlets and outlets of the condenser for the refrigerant and washing liquid may be arranged at a bottom region of the condenser. Preferably, the inlets and outlets of the condenser are arranged at the lowest or substantially lowest vertical position of the condenser. Preferably, the refrigerant inlet and outlet of the condenser may extend vertically or substantially vertically from the condenser.

[0044] Preferably, the washing liquid inlet and outlet of the condenser may be arranged opposite to each other and / or parallel to each other. Alternatively, the washing liquid inlet of the condenser is arranged perpendicular or substantially perpendicular to the washing liquid outlet of the condenser. The washing liquid outlet may extend in a direction to the compressor, wherein the washing liquid inlet extends in a direction to the washing liquid outlet.

[0045] Preferably, the condenser comprises a first section and a second section each extending vertically or substantially vertically, and a third section connecting the first and second sections for example in an arc shape, wherein preferably the apex of the arc is the highest vertical point of the condenser. Alternatively or additionally, the third section forms an arc having an angle of 180° or substantially 180 °. Preferably, the washing liquid inlet and / or outlet extends in a space between the first and second sections of the condenser.

[0046] Preferably the condenser is a tube-in-tube condenser. Preferably, the condenser comprises an inner tube forming the second (or the first) passage of the condenser and an outer tube forming the first (or second) passage of the condenser, and wherein the inner tube has a smaller cross section arranged within the outer tube having a larger cross section. In particular in the outer tube either the refrigerant or the washing liquid is flowing around the inner tube and wherein in the inner tube either the washing liquid or the refrigerant is flowing respectively.

[0047] The flow direction in the inner tube and the outer tube is preferably opposite to each other. The inner and outer tubes may have a circular cross section, wherein the smaller tube has a smaller diameter and the larger tube has a larger diameter. However, both tubes can also have any other shape. The inner tube may have a single circular tube or may have a plurality of parallel arranged tubes which are arranged within the outer tube. The outer tube is preferably made of a plastic material and / or the inner tube is preferably made of a metal material such as copper.

[0048] The condenser and in particular the outer tube of the condenser may be enclosed by a heat insulating layer.

[0049] The inner tube may comprise at least two pipes arranged parallel or substantially parallel to each other. Preferably the condenser inner tube branches off into the at least two pipes at a first branching point (i.e. at the inner tube inlet) arranged within the outer tube, and merges to a single tube at a second branching point (i.e. at the inner tube outlet) arranged within the outer tube.

[0050] Preferably, the outer tube comprises a plurality of spacing elements arranged along the inner surface of the outer tube for receiving the inner tube, wherein the spacing elements are adapted such that after mounting the inner tube within the spacing element, the outer tube and the inner tube are separated or spaced from each other, specifically the inner surface of the outer tube is spaced from the outer surface of the inner tube(s). The spacing elements are preferably made in one piece with the outer tube. In case the inner tube comprises a plurality of tubes, separate spacing elements for each tube may be provided or each spacing element is adapted to receive the plurality of tubes. Except at the spacing elements, within the outer tube, the inner and outer walls or surfaces of the tubes preferably do not contact each other. Preferably the spacing elements provide that the distance between the inner tube and outer tube is constant.

[0051] Pivoting of upper frame:

[0052] Preferably, the dishwasher comprises an upper frame configured to support the tub, wherein the basement is configured to support the upper frame and wherein the condenser is supported by the upper frame above the top cover element and wherein the upper frame is pivotably connected to the basement such that the upper frame and in particular the dishwasher components supported by the upper frame are pivotable around a pivot axis so that the condenser moves together with the upper frame. Preferably, evaporator tank and the compressor are arranged within the basement. In particular, the water piping connecting all water guiding components extend above the top cover element.

[0053] Preferably, the dishwasher comprises a refrigerant piping fluidly connecting the components of the heat pump system and comprising a first and second pipe section connected to the condenser. The first and second pipe section may connect the condenser to the heat pump components arranged in the basement wherein (I) at least a portion of the first and second pipe section is flexible (and / or pivotable) and configured to maintain the fluid connection between the condenser and the heat pump components in the basement during pivoting the upper frame relative to the basement, or wherein (II) the first and / or second pipe section comprises a pivotable member forming part of a hinge arrangement which is pivotably connecting the upper frame and the basement.

[0054] By the upper frame being pivotable, the dishwasher components supported by the upper frame are pivotally connected to the basement. By pivoting, the upper frame is pivotable relative to the basement or the basement is pivotable relative to the upper frame or the basement and upper frame are pivotable relative to each other.

[0055] "Pivoted" means that the upper frame and the basement encloses an angle (i.e. the upper frame does not (completely) rest on an upper surface of the basement). "Non-pivoted" means that the upper frame rests completely or substantially completely on the upper surface of the basement (i.e. the upper frame is parallel to the basement).

[0056] Maintaining the fluid connection preferably means maintaining a sealed connection between the condenser and the basement such that no refrigerant leaks from the refrigerant piping.

[0057] The pivoting of the upper frame simplifies the maintenance of the dishwasher. In particular, the upper frame and the tub supported by the upper frame can be pivoted relative to the basement so that the basement and / or the components of the dishwasher above the basement and adjacent to the upper frame can be accessed quickly and easily. Thus, no time-consuming disassembly is required to access the basement or the components near the upper frame for maintenance.

[0058] The heat pump components arranged in the basement are preferably at least the compressor and the evaporator. Further heat pump components arranged in the basement may be one or more of: an expansion device (e.g. a capillary or a controllable valve) and / or a refrigerant flow changing device and / or refrigerant check valves of the refrigerant piping and / or refrigerant drying devices and / or filter(s).

[0059] Preferably the upper cabinet of the dishwasher is supported by the upper frame and / or connected to the upper frame. Thus, the upper cabinet moves together with the upper frame when the upper frame is pivoted. The upper cabinet may comprise a door configured to close a front loading opening of the tub. Preferably the upper cabinet comprises two side walls configured to laterally cover the dishwasher components supported by the upper frame. The upper cabinet may comprise a rear wall configured to cover the dishwasher components supported by the upper frame at the dishwasher's back side. Optionally the upper cabinet may comprise a top wall, in particular a worktop, configured to cover the dishwasher components supported by the upper frame at the dishwasher's top side. The top wall is preferably used in case the dishwasher is a free-standing dishwasher and not a built-in type dishwasher.

[0060] Preferably, the first and / or second pipe section comprises a first leg portion and a second leg portion connected to each other by a flexible arc portion, and wherein, when the upper frame is pivoted, (I) the first and second leg portions are pivoted against each other by bending of the arc portion, and / or (II) the arc portion is twisted in itself. Preferably, the pivoting and / or twisting of the arc portion of the refrigerant pipes occurs at or adjacent to the pivoting axis.

[0061] 'Pivoted against each other' may mean that the angle enclosed by the first and second leg portions is changing, i.e. the leg portions move away from each other. 'Twisting in itself may mean that the angle enclosed by the leg portions remains the same, i.e. one leg portion is twisted around the other leg portion.

[0062] Preferably, in a non-pivoted position of the upper frame, i.e. in a position in which the upper frame rests on the basement, the angle enclosed by the first and second leg is in the range between 80-110°, 85-95°, more preferably 90° or substantially 90°.

[0063] Preferably the first and second pipe sections have the same or substantially same shape in the non-pivoted and / or in the pivoted state.

[0064] Preferably, at maximum the distance between the pivoting axis and the flexible arc portion or the first and second pipe sections is ± 10 cm, ± 7 cm, ± 5 cm, ± 3 cm, or ± 2 cm, and / or the flexible arc portion of the first and second pipe sections is bending around the pivoting axis and the pivoting axis is perpendicular to the plane of the flexible arc portion. The distance is preferably the distance between the middle region of the arc portion or the first and second pipe sections and the pivot axis.

[0065] By arranging the flexible pipe sections as close as possible at the pivoting axis the required length of the flexible pipe sections is kept low and / or the required 'free' space through which the flexible pipe sections have to move during a pivoting activity is minimized. The refrigerant leakage risk by using flexible refrigerant piping is minimized and / or 'flexing' space within the anyway rare useable component space within the dishwasher cabinet is minimized. Preferably the flexible arc portion is bending around the pivoting axis during the pivoting of the upper frame relative to the basement. Normally the center of the arc portion and the pivoting axis are not coaxial, but preferably the center axis and the pivoting axis are parallel and close to each other, for example at a distance of ± 10 cm, + 7 cm, + 5 cm, ± 3 cm, or ± 2 cm.

[0066] Preferably, the upper frame is pivotably around the pivot axis by an angle over the pivotingrange between (i.e. from .. to ..) 0°-140°, 0°-120°, 0°-l 10° or 0°-90°. Preferably, an angle of 0° corresponds to a non-pivoted position, i.e. in a position in which the upper frame completely rests on the basement.

[0067] In an embodiment, (II) when the pivotable member is provided for the first and / or second pipe section, the pivotable member comprises a first portion being stationary mounted at the basement and a second portion being stationary connected to the frame, wherein the first and second portions have refrigerant passages fluidly connected to each other in a sealing manner and being pivotable to each other. Preferably the stationary portion mounted at the basement has a refrigerant passage in the direction of the pivot axis or parallel to the pivot axis. When pivoting the upper frame, the first and second portions are pivoted against each other, i.e. the first and / or second pipe sections are not bend during pivoting of the upper frame. When providing the pivotable member, no flexible pipe section of the first and / or second pipe section is required. In this case, the first and / or second pipe sections can be designed as rigid pipes.

[0068] Preferably, the upper frame is pivotably connected to the basement via a or the hinge arrangement. The hinge arrangement may comprise a first hinge portion mounted at the basement and a second hinge portion mounted at the upper frame. Preferably the hinge arrangement comprises a first and second hinge element. For example, the first and second hinge portions are pivotably connected to each other by rods. Alternatively, the first (or second) hinge portion is formed such that the second (or first) hinge portion can be pivotably snapped in into the first hinge portion.

[0069] Preferably, recesses or apertures are provided in or adjacent to the hinge arrangement for receiving the first and second pipe sections such that the first and second pipe sections connected to the condenser can extend from the condenser into the basement. In particular, the recesses are formed by the upper frame and / or by the basement (in particular the lower housing and / or a top cover element of the basement).

[0070] Circulation Pump Preferably, the dishwasher comprises a circulation pump for circulating the washing liquid from the sump through the first passage of the condenser, and a control unit adapted to control the operation of the dishwasher. Preferably the condenser is designed such that if the control unit stops the circulation pump, the washing liquid flows out of the first passage due to the gravity. Thus, when the circulation pump is not operated, the washing liquid within the condenser automatically preferably flows out of the condenser. Therefore, no or substantially no washing liquid remains in the condenser after the circulation pump is turned off. Soiling of the condenser and the formation of bad odors over time due to washing liquid remained in the condenser can be prevented. It also prevents that 'old' washing liquid remained in the condenser is circulated in a next washing cycle back into the sump and is reused for the washing cycle.

[0071] Preferably, the dishwasher comprises a circulation flow path comprising: an inlet provided at the sump, and a flow controller or a flow manifold comprising at least one outlet connected to one or more spray devices for spraying washing liquid into the interior of the tub and for supplying the washing liquid back to the sump (dishwashing or rinsing operation mode).

[0072] Preferably in another washing circulation mode (washing liquid cooling mode) the washing liquid is circulated along a washing liquid cooling path (see below) using the same circulation pump which is used for circulating the washing liquid through the circulation flow path. In such arrangement preferably the circulated washing liquid is circulated through one of the outlets of the flow controller to the respective washing liquid cooling path or washing liquid circulation flow path.

[0073] Alternatively, a second circulation pump may be provided for the circulation flow path. The dishwasher may comprise a first circulation pump and a second circulation pump, wherein the first circulation pump is preferably configured to circulate the washing liquid along the circulation flow path, and the second circulation pump is preferably configured to circulate the washing liquid along the washing liquid cooling path, in particular along the first and / or the second cooling branch.

[0074] Since the second circulation pump does not circulate washing liquid through the spray device and in particular to one or more of the lower, middle and / or top spray device, the required pressure for circulating the washing liquid along the washing liquid cooling path (i.e. first and / or second cooling branch) is reduced as compared to the circulation of washing liquid along the circulation flow path. Therefore, the second circulation pump may be smaller (i.e. with less power) than the first circulation pump. Thus, the energy consumption of the second circulation pump is less compared to the first circulation pump. Therefore, energy can be saved compared to a configuration with a single circulation pump used for the washing liquid cooling path and the circulation flow path.

[0075] Refrigerant Flow Changing Device / Normal, Reverse Operation Mode

[0076] Preferably, the refrigerant flow changing device is adapted to change the refrigerant flow direction through the heat pump between a normal operation mode of the heat pump and a reverse operation mode of the heat pump. In the normal operation mode of the heat pump, the condenser is adapted to heat the washing liquid when the washing liquid is circulated through the first passage of the condenser and the evaporator is adapted to cool the heat exchanging medium. In the reverse operation mode of the heat pump, the condenser is adapted to cool the washing liquid when the washing liquid is circulated through the first passage of the condenser and the evaporator is adapted to heat the heat exchanging medium.

[0077] Preferably, the refrigerant flow changing device has a refrigerant inlet and a refrigerant outlet and is adapted in a first switching state to fluidly connect the refrigerant inlet to a first pipe of the refrigerant circuit and the refrigerant outlet to a second pipe of the refrigerant circuit, and in a second switching state to fluidly connect the refrigerant inlet to the second pipe of the refrigerant circuit and the refrigerant outlet to the first pipe of the refrigerant circuit.

[0078] The 'normal operation mode' may be used for heating the washing liquid, e.g. during a washing phase. In particular 'normal operation mode' may mean that the heat pump is operated in a heating mode such that the washing liquid is heated up at the condenser working as a condenser in the normal operation mode and the refrigerant is heated up at the evaporator working as an evaporator in the normal operation mode (i.e. the heat exchanging medium in the evaporator tank is cooled by the refrigerant).

[0079] The 'reverse operation mode' may be used for regeneration of the heat exchanging medium and / or for drying the articles. In particular 'reverse mode' may mean that the heat pump is operated in a regeneration mode such that the refrigerant is heated up at the condenser working as an evaporator in the reverse operation mode and the refrigerant is cooled at the evaporator working as a condenser in the reverse operation mode (i.e. the heat exchanging medium in the evaporator tank is heated by the refrigerant). Thus, the heat exchanging medium can be regenerated, i.e. the temperature of the heat exchanging medium is increased and / or an at least partial phase transition from the solid state (ice (solid phase) of the heat exchanging medium which may have formed during the normal operation of the heat pump can be melt) to the liquid state by absorbing latent heat may take place. When circulating the washing liquid through the tub, in particular during a drying phase, in the reverse mode, the washing liquid is preferably heated by the heat of the tub / structure of the dishwasher and the tub is thus cooled down. The extracted heat from the tub / structure of the dishwasher is then transferred in the condenser from the washing liquid to the refrigerant, via the refrigerant to the evaporator and in the evaporator from the refrigerant to the heat exchanging medium. Thus, by cooling down the tub, the remaining heat in the tub / structure of the dishwasher can be extracted and be used for regeneration of the heat exchanging medium.

[0080] Further, when circulating the washing liquid through the tub, in the reverse operation mode, the drying of the articles during a drying phase is improved. In particular, the humidity within the air contained in the tub condensates when contacting the cooled tub interior and the drying of the washed articles is improved.

[0081] For the purposes herein the term 'washing liquid' refers to the liquid used during a washing phase as well as to the liquid used during a rinsing phase as well as to the liquid which is used (circulated) 'only' for regeneration and / or drying purposes when the heat exchanging medium is regenerated and / or the drying is improved by cooling the tub (interior).

[0082] The heat pump can be operated in the reverse mode and heat can be extracted from the washing liquid and transferred to the heat exchanging medium, even if the heat exchanging medium needs no regeneration (i.e. melting of the iced / solid heat exchanging medium and / or heating of heat exchanging medium). E.g. if in the previous heating steps only electrical heating of the washing liquid by a / the electrical heater is provided, the heat exchanging medium was not cooled down (and thus no ice has been formed) for transferring heat from the heat exchanging medium to the washing liquid. Nonetheless the heat exchanging medium may be heated up by extracting heat from the washing liquid (e.g. for drying purposes as described herein).

[0083] The tub is preferably made of metal such as steel and / or the sump is preferably made of plastic. When circulating the washing liquid through the sump, the washing liquid preferably does not contact the tub, and thus the tub is not or substantially not cooled by the washing liquid. When circulating the washing liquid through the tub, the washing liquid preferably contacts the inner wall of the tub and thus cools the tub down.

[0084] Washing liquid cooling path / Flow Controller: The dishwasher preferably comprises a or the washing liquid cooling path having: an inlet provided at the sump, a circulation pump, the first passage of the condenser for cooling down the washing liquid in the reverse mode of the heat pump and at least one outlet to supply the cooled washing liquid back to the sump, wherein in particular the washing liquid cooling path bypasses a spray device.

[0085] The washing liquid cooling path may form a single flow path with one inlet and one outlet or may comprise several branches (such as the first and / or second cooling branch see below) each having its own outlet such that sections of the washing liquid cooling path run differently.

[0086] The spray device is disposed inside the tub and configured to spray washing liquid to the articles in the tub. The spray device may comprise one or more spray arms and optionally one or more spray nozzles arranged within the tub.

[0087] 'Bypasses the spray device' preferably means that when the heat pump is operated in the reverse operation mode and the washing liquid is guided along the washing liquid cooling path, then no washing liquid is guided to the spray device or any of the spray arms of the spray device. Thus, the articles are not contacted and not cooled by washing liquid supplied via the spray device. For example valves can be arranged such that the washing liquid flow to the spray device can be blocked or a flow controller (see e.g. below) can be controlled such that the washing fluid outlets connected to the spray device / spray arms can be closed.

[0088] In the washing liquid cooling path, guiding the washing liquid from the first passage of the condenser "back to the sump" may mean that the washing liquid is directly guided back to the sump via an outlet at or within the sump, i.e. preferably without being guided through the tub interior or without having an open flow path in the interior of the tub. In this case, the washing liquid is preferably supplied through an outlet at or within the sump below the bottom of the tub.

[0089] Alternatively or additionally, in the washing liquid cooling path, guiding the washing liquid from the first passage of the condenser "back to the sump" may mean that the washing liquid is guided back to the sump via the tub. I.e. the washing liquid cooling path may comprise an oudet within the interior of the tub and an open flow path section within the tub or a flow path section in heat exchange with the interior of the tub such that the circulated washing liquid exchanges heat with the interior of the tub and returns to the sump via the tub. The washing liquid is preferably circulated along the washing liquid cooling path and in particular through the sump and / or the tub such that articles loaded within the dishwasher are not contacted by the cooled washing liquid.

[0090] The 'interior' of the tub is preferably the region above the sump, more preferably above a (or any) filter at the tub bottom. The filter and the surrounding bottom wall of the tub preferably represents the bottom of the tub and thus the lower surface for the 'interior' of the tub.

[0091] The dishwasher may comprise a filtration assembly (such as the cover element mentioned further below) arranged at the sump. The filtration assembly may act as a filter for the washing liquid returning to the sump (e.g. after the washing fluid has been deployed in the tub via the spray device.

[0092] Preferably, the washing liquid cooling path comprises: a first cooling branch connecting the first passage of the condenser to an outlet at or within the sump, and / or a second cooling branch connecting the first passage of the condenser to an outlet within the interior of the tub for cooling the interior of the tub, wherein the washing liquid guided along the second cooling branch returns to the sump via the tub. In addition, the dishwasher may further comprise a hydraulic circulation arrangement (such as the flow controller described below) having at least one controllable component wherein by the control of the control unit the at least one controllable component is adapted to circulate the washing liquid pumped from the sump along the first cooling branch and / or the second cooling branch.

[0093] Preferably, the first passage of the condenser is arranged upstream of a flow controller or a flow manifold, and the flow controller or flow manifold preferably comprises at least an outlet A and / or an outlet B, wherein the first cooling branch comprises the outlet A connecting the first passage of the condenser to the outlet at or within the sump, and / or wherein the second cooling branch comprises the outlet B connecting the first passage of the condenser to the outlet within the interior of the tub. More preferably, the first and second cooling branches have a common flow path section upstream of the flow controller or flow manifold.

[0094] The flow controller or flow manifold may be a device for guiding washing liquid along different flow paths.

[0095] The 'flow manifold' may comprise a plurality of valves adapted to guide the washing liquid along different flow paths such as the first and / or second cooling branch. The flow manifold may have one flow path for each spray arm of the spray device of the dishwasher, such as a lower spray arm, a middle spray arm and a top spray nozzle or top spray arm. Preferably, one valve is arranged in each of the flow paths upstream of the spray devices for opening and closing the washing liquid flow to each spray device.

[0096] The 'flow controller' may comprise a plurality of washing fluid outlets such as the outlets A and / or B and / or one or more outlets connected to one or more spray arms of the spray device for spraying washing liquid to the articles. The flow controller may comprise one dedicated oudet for each of a lower spray device (e.g. spray arm), a middle spray device (e.g. spray arm), and a top spray device (e.g. spray nozzle). In case outlet A and B and the outlets for the lower spray device, the middle spray device and the top spray device are provided, the flow controller preferably comprises 5 outlets in total. In case only outlet A or B and the outlets for the lower spray device, the middle spray device and the top spray device are provided, the flow controller preferably comprises 4 outlets in total. The washing fluid outlets are preferably arranged at the tub bottom, more preferably are integrated in the sump.

[0097] The flow controller may include a positioning device and a disk rotatably arranged in relation to the plurality of washing fluid outlets, wherein the disk comprises a plurality of apertures arranged for selectively closing and opening the plurality of washing fluid outlets and / or the outlet A and / or B of the sump during rotation of the disk. When the positioning device aligns at least one of the plurality of apertures of the disk with at least one of the washing fluid oudets, the washing liquid is permitted to pass from the flow controller along each aligned washing fluid outlets. For example, when the positioning device aligns at least one of the plurality of apertures of the disk with the outlet A and / or B, the washing fluid is permitted to pass from the flow controller along the first and / or second cooling branch, respectively. Similar, when the positioning device aligns at least one of the plurality of apertures of the disk with at least one of the washing fluid outlets connected to the spray device, the washing fluid is supplied through the washing fluid outlet(s) from the flow controller via the respective spray device into the tub.

[0098] The control unit is preferably adapted to control the flow controller or the flow manifold such that the washing liquid is guided along one or more of the washing fluid outlets.

[0099] Preferably the flow controller or flow manifold has a closed position in which no washing liquid can pass through any outlet of the flow controller or flow manifold.

[0100] Sump nozzle / Tub nozzle Preferably, the outlet at or within the sump is a sump nozzle arranged at the sump below the bottom of the tub or an outlet arranged in a bottom wall or a side wall of the sump. The outlet within the tub may be a tub nozzle which is arranged inside the tub volume at the bottom of the tub, or at a side wall of the tub such that the water flows along a side wall of the tub, or at a fluid path section arranged within the tub for supplying washing liquid to the spray device.

[0101] Preferably, the dishwasher comprises a cover element arranged at the bottom of the tub above the sump, wherein the tub nozzle and / or the sump nozzle are at least partially integrated in the cover element.

[0102] The cover element is preferably adapted to cover at least a portion of the sump. Preferably at least a portion of the cover element is arranged above the flow manifold or flow controller and / or covers the flow manifold or flow controller. The flow manifold or flow controller may be arranged at the sump, preferably is integrated in the sump. The cover element may comprise a plurality of outlets each being aligned with one outlet of the flow manifold or the flow controller. Thus, washing liquid supplied through any of the outlets of the flow manifold or flow controller is guided through an outlet of the cover element.

[0103] Preferably, the cover element has a portion formed as a filter adapted to filter washing liquid flowing from the interior of the tub to the sump. The cover element and the sump nozzle and / or the tub nozzle may be formed in a single piece, preferably fabricated from a plastic material.

[0104] Preferably, the cover element extends over the washing fluid outlets of the flow controller or manifold and the cover element comprises sump attachments, each sump attachment sized and shaped to fit over the respective washing liquid outlets of the sump to connect each of the plurality of washing fluid outlets to the respective spray devices and / or to the sump nozzle and / or the tub nozzle. In particular, the sump attachments extend from a lower surface of the cover element facing the washing fluid outlets.

[0105] Preferably, the cover element comprises a hub extending from an upper side of the cover element, wherein the hub is adapted to connect one washing fluid outlet of a or the plurality of outlets to a spray device being a lower spray arm. The hub is preferably made in one piece with the cover element.

[0106] The sump nozzle and / or the flow channel are preferably arranged below the interior of the tub, i.e. facing away from the tub interior. The washing liquid flowing through the sump nozzle preferably does not flow through the interior of the tub and thus does not contact the articles therein.

[0107] The tub nozzle is preferably arranged within the interior of the tub, i.e. washing liquid exiting the tub nozzle is guided through the interior of the tub, in particular for cooling down the tub interior. The tub nozzle is preferably adapted such that washing liquid sprayed out of the nozzle does not contact the articles loaded in the dishwasher. Preferably, the tub nozzle sprays the washing liquid to the tub bottom.

[0108] Preferably, the flow controller is arranged below the cover element, and / or the cover element comprises a plurality of outlets each being assigned to one outlet of the flow controller.

[0109] Each individual feature of the dishwasher as disclosed herein can be combined with any subgroup of features (e.g. any of the dependent claims) of the dishwasher.

[0110] Any feature disclosed herein (for the above embodiments and / or configurations and from the below described detailed embodiments and modifications) can be combined with the claimed subject individually or in any sub-combination. If herein the conjunction "and / or" is used all logical elements and combinations are individually disclosed. E.g. a, b and / or c discloses the elements / combinations a, b, c, ab, ac, be as well as abc. Terms like "vertical" or "horizontal" or "front" or "rear" or "upper" or "lower" refer to an operational orientation of the dishwasher.

[0111] Reference is made in detail to preferred embodiments of the invention, examples of which are illustrated in the accompanying figures, which show:

[0112] Fig. 1 a perspective view of a dishwasher,

[0113] Fig. 2 another perspective view of the dishwasher of Fig. 1 without the door, the side walls and the top wall of the tub,

[0114] Fig. 3 a perspective view of the dishwasher of Fig. 2 without the tub bottom,

[0115] Fig. 4 a top view of the dishwasher of Fig. 3 without the air circulation path,

[0116] Fig. 5 a perspective view of the dishwasher of Fig. 4,

[0117] Fig. 6 another perspective view of the dishwasher of Fig. 5, Fig. 7 a schematic view of the heat pump and washing liquid flow path arrangement of the dishwasher of Fig. 5,

[0118] Fig. 8 a perspective view of the sump and the filtration assembly of the dishwasher of Fig. 3,

[0119] Fig. 9 a perspective view of the sump and the flow controller,

[0120] Fig. 10 an exploded view of the sump and the flow controller of Fig. 9,

[0121] Fig. 11 a schematic view of the refrigerant circulation circuit of the dishwasher of Fig. 5,

[0122] Fig. 12 a perspective view of the basement of the dishwasher of Fig. 5,

[0123] Fig. 13 a perspective view of the basement of Fig. 12 without the top cover element,

[0124] Fig. 14 a top view of the basement of Fig. 13 without the top cover element,

[0125] Fig. 15 a sectional view of the basement of Fig. 14 along line B-B with the top cover element,

[0126] Fig. 16 an exploded perspective view of the basement of Fig. 12,

[0127] Fig. 17 an exploded perspective view of the evaporator module of Fig. 16,

[0128] Fig. 18 a perspective view of the evaporator tank cover of the evaporator tank of Fig. 17,

[0129] Fig. 19 a perspective view of the upper frame of the dishwasher of Fig. 5,

[0130] Fig. 20 another perspective view of the upper frame of Fig. 19,

[0131] Fig. 21 a perspective view of the dishwasher of Fig. 1 in a pivoted state of the upper frame,

[0132] Fig. 22 another perspective view of the dishwasher of Fig. 21, Fig. 23 a detailed perspective view of the basement with the upper frame in a pivoted state, and

[0133] Fig. 24 a detailed perspective view of the basement with the upper frame in a non-pivoted state.

[0134] Fig. 1 is a perspective view of a dishwasher 2 having a heat pump system and Fig. 2 is another perspective view of the dishwasher of Fig. 1 without the door, the side walls and the top wall of a tub. The dishwasher 2 comprises a dishwasher cabinet housing the tub 8 for washing articles therein. The tub 8 comprises side walls 10, a top wall 14, a rear wall (not shown), and a tub bottom 16 (see Fig. 2). The dishwasher 2 may further comprise a door 18 that may be pivotably connected with the tub 8 to selectively permit access to the tub 8 for loading and unloading the articles and which is closed when the dishwasher 2 is operating (e.g. when the articles in the dishwasher 2 are washed and / or cleaned). Preferably, the dishwasher cabinet has an upper cabinet 9. The upper cabinet 9 may comprise the door 18 configured to close a front loading opening of the tub 8. Preferably, the upper cabinet 9 comprises two side walls (not shown) configured to laterally cover the dishwasher components supported by the basement 6 (i.e. by an upper frame 7 supported by the basement), a rear wall (not shown) configured to cover the dishwasher components supported by the basement 6 (upper frame 7) at the dishwasher's back side. Optionally the upper cabinet 9 comprises a top wall, in particular a worktop, configured to cover the dishwasher components above a basement 6 at the dishwasher's top side. The top wall is preferably used in case the dishwasher is a free-standing dishwasher and not a built-in type dishwasher.

[0135] The cabinet may further comprise a basement 6 (lower cabinet of the dishwasher) arranged below the tub bottom 16. The basement 6 may have outer walls and / or a bottom wall forming a lower housing of the basement. The basement 6 and in particular the lower housing 6a is preferably configured to support the tub 8 and / or the upper cabinet 9. Preferably the dishwasher 2 comprises an upper frame 7 configured to support the tub 8 and / or the upper cabinet 9. The upper frame 7 may be arranged between the basement 6 and the upper cabinet 9. The basement 6 is configured to support the upper frame 7.

[0136] The operation of the dishwasher 2 is controlled by a control unit (not shown) which is arranged on a control board which in turn is arranged above the tub or within the door 18.

[0137] Dishes, utensils, and other dishware (also referred to herein as 'articles') may be placed in the tub 8 for cleaning. The dishwasher 2 may also include slidable lower and upper racks or baskets (not shown) for holding the articles to be cleaned. The racks may be movable into and out of the tub 8.

[0138] The dishwasher 2 may have a control panel 4 which is preferably arranged at an upper region of the dishwasher front face, e.g. at the middle and / or right side of the upper region of the dishwasher front face. Alternatively, the control panel 4 is integrated in the door 18, more preferably arranged at an upper region of the door 18. The control panel 4 preferably comprises a display for displaying information about the washing program (e. g. energy consumption, duration of the washing cycle and the like) and an input device for selecting between different washing programs.

[0139] As shown in Figs. 1 and 2, the dishwasher 2 may comprise an internal air circulation path 20 for circulating air within the tub 8, preferably during drying of the articles contained in the tub 8. The air circulation path 20 may comprise an inlet 20a and an outlet 20b each connected to the interior of the tub 8. Preferably, a blower 20c is provided at or close to the inlet 20a. Preferably, the inlet 20a and outlet 20b are arranged at opposing side walls of the tub 8. With respect to the normal operation position of the dishwasher, the inlet 20a is preferably arranged on the right side wall and the outlet 20b is arranged at the left side wall of the tub 8. The inlet 20a may be arranged at a vertical position which is higher than the vertical position of the outlet 20b. The air circulation path 20 preferably extends external to the tub 8.

[0140] As shown in Figs. 2 and 3, the dishwasher 2 may comprise a washing liquid circulation path for circulating the washing liquid during a washing cycle. In particular, the washing liquid collected in a sump 48 (see Fig. 3) may be pumped via a circulation pump 50 through a washing liquid conduit system 22 into the interior of the tub 8. The washing liquid conduit system 22 may include a delivery conduit 24 that is fluidly connected to one or more spray devices (the spray devices are not shown). In the exemplary embodiment, the delivery conduit comprises a connector 26 adapted to be connected to a first spray device (e.g. top spray device 26a, Fig. 7), a connector 28 adapted to be connected to a second spray device (e.g. middle spray device 28a, Fig. 7), and a connector 30 adapted to be connected to a third spray device (e.g. a lower spray device 30a, Fig. 7). The top spray device (preferably a spray nozzle) is preferably proximate to a top portion of the dishwasher, the lower spray device (preferably a spray arm) is preferably proximate the tub bottom 16, and the middle spray device (preferably a spray arm) is preferably located between the top and lower spray devices. The delivery conduit 24 and spray devices of the washing liquid conduit system are configured for spraying the washing liquid, under pressure, onto the articles contained in the tub 8 during dishwasher use. As shown in Fig. 2, the dishwasher 2 may comprise a filtration assembly 40 that is connected to a sump 48 (see Fig. 3). The filtration assembly 40 is configured to filter the washing liquid returning to the sump 48 after washing liquid has been deployed in the tub 8.

[0141] The dishwasher 2 may include a control unit (not shown) in communication with one or more of the dishwasher's functional components. E.g. the control unit may be in communication with a circulation pump 50 and may be configured to selectively operate the circulation pump 50 to pump washing fluid to at least one of the spray devices of the washing liquid conduit system 22. In accordance with some embodiments, the dishwasher 2 may comprise a flow manifold or a flow controller 64 (flow manifold may be any device having valves for guiding the washing liquid along different flow paths; the flow controller is preferably a device as it is shown e.g. in Fig. 13). The control unit may be adapted to control the flow controller 64, as will be described in more detail below. The control unit may include a memory for storage of data such as routines for operation of dishwasher 2.

[0142] As shown in Figs. 3 and 4, the dishwasher 2 comprises the sump 48 for collecting washing liquid, typically under the influence of gravity. The dishwasher 2 uses the washing liquid to clean, wash and rinse the articles. The sump 48 is arranged below the tub bottom 18, in particular the sump 48 is fluidly connected from below to the tub bottom 18, such that the washing liquid within the tub 8 can flow into the sump 48.

[0143] As shown in Fig. 3, the dishwasher 2 may comprise a fresh water tank assembly 46 having a fluid connection to water mains. A fresh water inlet valve (not shown) may be provided upstream of the fresh water tank assembly 46 for enabling or blocking flow of fresh water into the dishwasher 2. As shown in Fig. 3, a flow meter 58 may be provided upstream of the fresh water tank assembly 46 for providing a feedback signal indicating the amount of supplied fresh water to the control unit. The fresh water tank assembly 46 may comprise a tank for storing fresh water. The fresh water tank assembly 46 may further comprise a ventilation connection 46a to the tub 8 for equalizing the pressure between the fresh water tank assembly 46 and the tub 8 and / or if the water tank overflows, the overflowing washing liquid is guided through the connection 46a into the tub interior.

[0144] In case, the dishwasher comprises a softener assembly 52 (as shown in the figures herein), an oudet 54a of the tank assembly 46 is connected to a salt container of the softener assembly 46, and another outlet 54b of the tank assembly 46 is connected to a resin container 54b of the softener assembly 46. The fresh water flowing out of the tank assembly 52 may be guided either through the outlet 54b connected to the resin container (for softening the fresh water), or, if a regeneration of the resin in the resin container is necessary, through the outlet 54a connected to the salt container and then through the resin container. A valve element (not shown) such as a two-way valve may be provided upstream of the salt container and preferably downstream of the outlet 54a for enabling or blocking water flow into the salt container. The softener assembly 52 is preferably arranged at least partially below the tank assembly 46. A tank valve (not shown) may be provided downstream of the water tank assembly 46 and upstream of the softener assembly 52 for enabling or blocking water flow out of the water tank assembly 46.

[0145] The softener assembly 52 may comprise an outlet which is connected to the sump 48 via a flow connection 56 (see Fig. 4). For example, fresh water can be supplied directly to the sump 48 via the tank assembly 46. Alternatively, the tank assembly 46 can be filled with fresh water which can be supplied to the sump 48 in a subsequent phase of the washing cycle or in a subsequent washing cycle.

[0146] The dishwasher 2 may comprise a draining circuit 59 for draining the washing liquid in the sump 48, via a drain pump 60, out of the dishwasher 2 (see Figs. 4 and 5). The draining circuit 59 may comprise a first, second and third draining path section 62a-c. The first draining path section 62a comprises an inlet at the sump 48 and the outlet of the first draining path section 62a is connected to an inlet of the second draining path section 62b which is preferably arranged at a side wall of the tub 8. An outlet of the second draining path section 62b is connected to an inlet of the third draining path section 62c guiding the washing liquid out of the dishwasher 2.

[0147] The second draining path section 62b may comprise a siphon or air gap for preventing dirty water to flow back into the dishwasher 2. In particular, the second draining path section 62b may extend from the bottom to the top and from the top to the bottom forming a siphon. Thus, when the drain pump 60 for draining the washing liquid is stopped, the remaining dirty washing liquid within the second draining path section 62b flows out of the draining path 62b due to gravity. When the draining circuit 59 has a clog or blockage downstream of the air gap / siphon, no dirty water can flow from the outside of the dishwasher 2 back into the dishwasher 2 via the second draining path section 62b due to the siphon / air gap.

[0148] The refrigerant flow directions 31a, 31b of the refrigerant in the heat pump system of the dishwasher 2 and the washing liquid flow direction 32 are indicated by arrows in some of the following Figures (see: Figs. 6, 7 and 11). Therefore, a dashed arrow defines the washing liquid flow direction 32 and a filled arrows indicate the refrigerant flow directions 31a, 31b. These definitions for the flow directions are valid for the figures herein. In particular, the refrigerant flow direction 31a shown in Figs. 7, 11 and 14 corresponds to a "normal" refrigerant flow direction (i.e. when the heat pump is operated in the normal operation mode). When the heat pump is operated in the reverse mode, the refrigerant flow direction corresponds to a "reverse" refrigerant flow direction 31b which is opposite to the "normal" refrigerant flow direction 31a (see Figs. 7, 11 and 14: white filled arrows). The different operation modes of the heat pump are described further below.

[0149] Washing liquid cooling path

[0150] As shown in Figs. 5 to 7, the dishwasher may comprise a washing liquid cooling path 43 having an inlet provided at the sump 48 (i.e. the inlet to the path 43 corresponds to an outlet at the sump), wherein the inlet is connected to a circulation pump 50, a condenser 44 and the flow manifold or preferably (and as shown in the Figures 1 to 10) the flow controller 64 (described in detail with respect to Figs. 8 to 10). An outlet of the circulation pump 50 is connected to an inlet 82a of the condenser 44 and an outlet 82b of the condenser 44 is connected to an inlet 66 of the flow controller 64. As further described below, the flow manifold or flow controller 64 may comprise one outlet (first, second, and / or third outlet 70, 72, 74, see below) for each spray device, wherein preferably in the normal operation mode of the heat pump, the washing liquid is heated and circulated through one or more of the spray devices into the tub 8. The flow manifold or flow controller 64 may have further outlets (see further below: fourth and fifth outlets 76, 78), wherein when operating the heat pump in the reverse mode, washing liquid is preferably circulated along the washing liquid cooling path 43 through the fourth and / or fifth outlets 76, 78 for cooling the washing liquid and / or the tub 8 (preferably while bypassing any spray devices).

[0151] In Figs. 7, 11 and 14, the reverted refrigerant flow direction 3 lb for cooling the washing liquid is indicated by the white filled arrows and the normal refrigerant flow direction 31a for heating the washing liquid is indicated by the black filled arrows.

[0152] Fig. 7 shows a schematic view of the heat pump and washing liquid flow path arrangement, i.e. the refrigerant circulation circuit 83 and the washing liquid cooling path 43 of the dishwasher 2 shown in Fig. 1 to 6.

[0153] The flow controller 64 may comprise the outlet A 76 connected to the sump 48 via the first cooling branch 43a, in particular the sump nozzle 98, and comprises the outlet B 78 connected to the tub 8 via the second cooling branch 43b, in particular the tub nozzle 100, for supplying cooled washing liquid in a reverse mode of the heat pump. Further, the flow controller 64 may comprise the first, second and third outlets 70, 72, 74, wherein the first outlet 70 is connected to the lower spray device 30a, the second outlet 72 is connected to the top spray device 26a and the third outlet 74 is connected to the middle spray device 28a.

[0154] Although the flow controller 64 in the Figures herein is shown with the three outlets 70, 72, 74 for the spray devices, it is understood that only one or two of the outlets can be present in any of the embodiments disclosed herein. Similar, only one of the outlets A and B may be present in any of the embodiments disclosed herein.

[0155] Further, a heater (not shown) for heating the washing liquid in addition or alternatively to the heating of washing liquid by the condenser 44 may be provided. The heater may be provided within the sump 48. Preferably, the heater is arranged within or integrated in a housing of the circulation pump 50.

[0156] Heat pump system

[0157] As shown in Figs. 5 to 7, the dishwasher 2 comprises a heat pump (i.e. heat pump system). The heat pump comprises a compressor 92, the condenser 44 and an evaporator 90. The condenser 44 has an outer or first passage 82 for guiding the washing liquid and an inner or second passage 84 for guiding the refrigerant (see also Fig. 11), wherein the first and second passages 82, 84 are in heat exchanging contact with each other. As shown in Fig. 11, the condenser 44 is preferably a tube-in-tube condenser, wherein an outer tube forms the first passage 82 and an inner tube forms the second passage 84.

[0158] The compressor 92 is used for increasing the pressure of the refrigerant and for circulating the refrigerant within a refrigerant circulation circuit 83. The refrigerant is circulated through the second passage 84 of the condenser 44, the compressor 92 and the evaporator 90 in the refrigerant circulation circuit 83 (not necessarily in this order).

[0159] Condenser

[0160] The condenser 44 is preferably arranged at a side wall 10 of the tub 8. Preferably, the condenser 44 is arranged between the side wall 10 of the tub 8 and the cabinet of the dishwasher 2. Preferably the condenser 44 is supported by the tub 8 and / or the side wall of the cabinet and / or by the upper frame 7. When considering the normal operation position of the dishwasher 2, the condenser 44 may be arranged at the right side wall of the dishwasher 2 as shown in Fig. 2. In an embodiment the condenser may be arranged between the rear wall of the tub 8 and the rear wall of the upper cabinet 9 and the upper frame is pivotable relative to the basement 6 to the rear side. The condenser 44 may extend in a vertical or substantially vertical plane. Inlets and outlets 82a, 82b, 84a, 84b of the first passage 82 and the second passage 84, respectively, may be arranged at the bottom of the condenser 44.

[0161] As shown in Figs. 5 and 11, the condenser 44 may comprise a first section 80a, a second section 80b arranged opposite to the first section 80a, and a third section 80c connecting the first and second sections 80a, 80b. The first and second sections 80a, 80b preferably each extend vertically or substantially vertically. The third section 80c preferably connects the first and second sections 80a, 80b in an arc shape, wherein the apex of the arc is the highest vertical point of the condenser 44. The arc may have an angle of 180° or substantially 180°.

[0162] As shown in Fig. 11, the second passage 84 may comprise at least two pipes arranged parallel to each other. For this the inner second passage 84 is split by a branch into two parallel passage lines wherein each a branch is provided at the inlet region and end region within the first passage 82. Thereby the heat exchanging capacity is doubled.

[0163] A plurality of spacing elements 81 may be arranged along the inner surface of the first passage 82 for receiving the second passage 84. The spacing elements 81 are adapted such that after mounting the second passage 84 within the spacing elements 81, the inner walls of the second passage 84 and the outer walls of the first passage 82 are separated or spaced from each other. Thus, a spacing between first passage 82 and second passage 84 is ensured such that liquid can pass between the inner surface of the first passage and the outer surface of the housed second passage.

[0164] The wall forming the first passage 82 may be divided into a first and second half (first and second shells). As shown in Fig. 5, the first passage 82 is divided vertically or substantially vertically in the first and second half. When mounting both halves while the second passage 84 is already arranged within one of the halves, the first and second halves form the outer tube 82 for guiding the washing liquid around the inner tube 84 while the inner tube is provided for guiding the refrigerant.

[0165] For heat exchange, the washing liquid is circulated through the first passage 82 of the condenser 44 and refrigerant through the second passage 84. After heat exchange the control unit is adapted to stop the circulation pump 50 such that the washing liquid flows out of the condenser, i.e. out of the first passage 82 due to the gravity. Thus, accumulation of dirt in the first passage 82 can be avoided. An inlet 82a of the first passage 82 of the condenser 44 (see Fig. 7) is connected via a first fluid flow path 68a to an outlet of the circulation pump 50. A second fluid flow path 68b connects an outlet 82b of the first passage 82 to the inlet 66 of the flow controller 64.

[0166] Refrigerant circulation circuit

[0167] As shown in Fig. 7, the refrigerant circulation circuit 83 comprises a first, second, third, fourth, fifth and sixth refrigerant circuit section 83a-f. A first refrigerant circuit section 83a connects an outlet 84b of the second passage 84 to an evaporator inlet 90a, a second refrigerant circuit section 83b connects an evaporator outlet 90b to a first inlet 86a of a switching element (switching valve) 86 (refrigerant flow changing device), a third refrigerant circuit section 83c connects a first outlet 87a of the switching valve 86 to a compressor inlet 92a, a fourth refrigerant circuit section 83d connects a compressor outlet 92b to a second inlet 86b of the switching valve 86, a fifth refrigerant circuit section 83e connects a second outlet 87b of the switching valve 86 to an inlet 84a of the second passage 84 of the condenser 44, and a sixth refrigerant circuit section 83f (being the second passage 84) connects the inlet 84a to the outlet 84b. The piping of the refrigerant circuit sections may be provided as flexible pipes. The flexible pipes may be easily adapted to paths which are not straight without requiring mechanical bending as it is the case when using e. g. copper pipes.

[0168] An expansion arrangement 88 (e. g. a capillary or expansion valve) may be provided within the first refrigerant section 83a connecting the outlet 84b of the second passage 84 to the evaporator inlet 90a. The expansion arrangement 88 may be adapted to control the amount of refrigerant released into the evaporator 90. With respect to Fig. Il a preferred implementation of the refrigerant circulation circuit 83 is described.

[0169] As indicated in Fig. 5, at least one of the following components of the refrigerant circulation circuit 83 may be arranged at the basement 6 of the dishwasher 2: the compressor 92, the evaporator 90, the expansion arrangement 88 and / or the switching valve 86. Preferably the switching valve 86 is positioned vertically, in particular perpendicular to the rotation axis of the compressor 92. A specific implementation of the components of the refrigeration circulation circuit 83 in the basement 6 is shown in Figs. 12ff and is described further below.

[0170] The switching valve 86 may be a valve that only guides the refrigerant from the first inlet 86a to the first outlet 87a and from the second inlet 86b to the second outlet 87b. Preferably, the switching valve 86 is configured to change the refrigerant flow direction within the refrigerant circulation circuit 83. The flow direction of the refrigerant and the flow direction of the washing liquid within the condenser 44 may be opposite to each other for improving the heat exchange.

[0171] Evaporator

[0172] As schematically shown in Fig. 7, the evaporator 90 is preferably arranged in an evaporator tank 94 (see also: Fig. 17). The evaporator tank 94 is preferably arranged in the basement 6 of the dishwasher, i.e. below the tub 8 (see Fig. 13). The evaporator tank 94 may be sealed by a seal extending along the edge of the opening of the evaporator tank 94 or any other sealing mechanism and is preferably closed by an evaporator tank cover 95. The evaporator tank cover may have a convenient form that seals the evaporator tank 94.

[0173] As shown in Fig. 17, the evaporator tank 94 is preferably a closed tank for permanently storing a heat exchanging medium. Preferably the evaporator 90 is arranged or received inside the evaporator tank 94. The evaporator 90 is in heat exchanging contact with the heat exchanging medium for enabling heat exchange between said medium and the refrigerant flowing inside the conduits of the evaporator 90. The evaporator 90 may have e. g. a meandering structure or any other structure. The evaporator 90 may be used for warming the circulating refrigerant (and cooling the heat exchanging medium), which is the "normal" operation mode of the heat pump, or for cooling the circulating refrigerant (and warming the heat exchanging medium), which is the "reverse" operation mode of heat pump. The warmed refrigerant may be used for warming the circulating washing liquid by heat exchange in the condenser. The evaporator 90 and the evaporator tank 94 may have the shape of an 'L', when looking at the evaporator tank 94 from above in the normal operating position of the dishwasher. The evaporator 90 may be mounted and fixed within the evaporator tank 94 via mounting elements. The mounting elements may be configured such that the evaporator 90 is distanced from an inner bottom surface of the evaporator tank 90.

[0174] Different operation modes

[0175] In the heating mode (the 'normal' operation mode of the heat pump system), within the refrigerant circulation circuit 83, starting from refrigerant outlet 84b of the condenser 44, the refrigerant is directed by the first refrigerant circuit section 83a through the expansion arrangement 88 to the evaporator 90. The compressor 92 arranged within the refrigerant circulation circuit 83 creates a vacuum applied to the evaporator 90. The heat exchanging medium in the evaporator tank 94 is in heat-exchanging contact with the evaporator 90. The medium is cooled down and finally changes from the liquid to the solid phase for releasing heat. The heat released heats the refrigerant in the evaporator 90 which then evaporates. The heated gas phase refrigerant is sucked by the compressor 92 through the second refrigerant circuit section 83b, the switching valve 86 and the third refrigerant circuit section 83c. The compressed refrigerant is passed through the fourth refrigerant circuit section 83d, the switching valve 86 and fifth refrigerant circuit section 83e to the condenser 44 through the refrigerant condenser inlet 84a. Within the condenser 44, the refrigerant and the washing liquid preferably flow in opposite directions for an improved heat exchange. In the condenser the washing liquid is heated by transferring the heat from the refrigerant to the washing liquid. The refrigerant cools down from the refrigerant inlet 84a to the refrigerant condenser outlet 84, i.e. within the second passage 84. The washing liquid is heated in the first passage 82 from the condenser inlet 82a to the washing liquid condenser outlet 82b.

[0176] The heated washing liquid exits the condenser 44 through the washing liquid condenser outlet 82b and the washing liquid may be guided through any of the outlets of the flow controller as described above.

[0177] In the cooling mode (the 'reverse operation mode') for 'de-icing' the evaporator 90 in a washing cycle and / or if in a drying phase of a washing cycle the tub is to be cooled down for improving the drying, the refrigerant flow direction is reverted as indicated by the white filled arrows 31b in Figs. 7, 11 and 14 (the black filled arrows indicate the normal flow direction 31a for the heating process of the washing liquid). This is the 'reverse mode' of the heat pump system. The reversal of the refrigerant flow through the condenser 44, expansion arrangement 88 and evaporator 90 is provided by the refrigerant flow changing device 86. In refrigerant flow reverse mode, the evaporator 90 works as a condenser and heats the heat exchanging medium within the evaporator tank 94. The condenser 44 operates as an evaporator and cools the circulated liquid (which is freshly supplied tap water and / or water from the previous rinsing or washing). The expansion arrangement 88 preferably is a dual-direction expansion device, e.g. a capillary that operates independent of the flow direction. Alternatively, and as exemplarily shown in the implementation of Fig. 11, the expansion arrangement 88 may be a one-direction expansion device, e.g. a capillary that operates only in one flow direction.

[0178] The cooled washing liquid exiting the condenser 44 (i.e. first passage 82) may be guided through extra an outlet A and / or B (see below) 76, 78 of the flow controller 64. The supplied water may flow directly into the sump 48 via outlet A 76 or into the sump via the tub. The washing liquid collected in the sump 48 can then be drained with the drain pump 60 along the draining circuit 59, e.g. after the de-icing of the evaporator 90 and / or cooling of the tub 8.

[0179] The flow changing device 86 has two switching states, wherein the refrigerant conveyance direction of the compressor 92 is preferably not changed in both switching states. a) In a first state (normal operation state for the heat pump, heating mode as described above) the evaporator 90 operates as evaporator and the condenser 44 operates as condenser. The refrigerant compressed by the compressor and coming from the compressor outlet is directed by the switching valve 86 to the condenser 44. The refrigerant from the evaporator 90 is sucked in through the switching valve 86 to the compressor inlet. b) In a second state (refrigerant flow reversal, cooling mode as described above) the refrigerant compressed by the compressor 92 is directed by the switching valve 86 to the evaporator 90. The refrigerant exiting the condenser 44 is sucked in by the compressor 92 through the switching valve 86 being in its second switching state.

[0180] Fig. 8 is a perspective view of the sump 48 and the filtration assembly 40 of the dishwasher 2 of Fig. 3, and Fig. 9 is a perspective view of the sump 48 and the flow controller 64. The sump 48 may comprise one or more washing fluid outlets 70, 72, 74 connected to the washing liquid conduit system 22. The outlets 70, 72, 74 are preferably provided along an internal side of the sump 48 that, in use, is located proximate to the tub bottom 16. The outlets generally serve to enable the flow of washing fluid from the sump 48 to different components of the dishwasher 2. For example, the sump 48 comprises a first outlet 70 being fluidly connected to the lower spray device of the washing fluid conduit system 22, a second outlet 72 being fluidly connected to the top spray device of the washing fluid conduit system 22, and a third oudet 74 being fluidly connected to the middle spray device of the washing fluid conduit system 22.

[0181] As mentioned above, a fourth washing fluid outlet (herein called "extra outlet A") and / or a fifth washing fluid outlet (herein called "extra outlet B) 76, 78 may be provided at the sump 48, preferably in proximity to the first, second and / or third outlets 70, 72, 74. Further, a drain outlet 79 may be provided in the sump 48 to facilitate circulation of the washing fluid in the sump 48 by operation of the circulation pump 50.

[0182] The plurality of outlets 70-78 may be arranged at the sump 48. Preferably, the flow controller 64 is integrated in the sump 48 and comprises the outlets 70-78. Washing liquid guided from the condenser 44 to the inlet 66 of the flow controller 64 and flowing through the first outlet 70 supplies washing liquid to the lower spray device. Washing liquid guided from the condenser 44 to the inlet 66 of the flow controller 64 and flowing through the second outlet 72 supplies washing liquid to the top spray device. Washing liquid guided from the condenser 44 to the inlet 66 of the flow controller 64 and flowing through the third outlet 74 supplies washing liquid to the middle spray device. In other embodiments, outlets 70, 72, 74 may enable the supply of washing fluid from sump 48 to any spray devices and / or any other component of washing fluid conduit system 22 of the dishwasher 2. Preferably, the washing liquid is supplied into the tub 8 via the first, second and / or third outlet 70, 72, 74 when the heat pump is operated in the normal operation mode in which the washing liquid is heated.

[0183] As shown in Fig. 9, sump 48 is preferably unitary and / or may be formed by a single-piece construction. The functioning of the flow controller 64 is described in detail with respect to Fig. 10.

[0184] Sump nozzle / tub nozzle

[0185] As shown in Figs. 7 to 9, the extra outlet A 76 is fluidly connected to a tub outlet, preferably a tub nozzle 100, which is adapted to supply washing liquid into the interior of the tub 8 at the tub bottom region. Extra outlet B 78 is preferably fluidly connected to a sump outlet, preferably a sump nozzle 98, being adapted to directly supply washing liquid back into the sump 48, preferably avoiding that the circulated liquid is guided through the tub.

[0186] As shown in Fig. 7, the washing liquid cooling path 43 may comprise a first cooling branch 43a in which washing liquid exiting the condenser 44 (i.e. first passage 82) is guided through the extra outlet A 76 and via the sump nozzle 98 back into the sump 48, and / or a second cooling branch 43b in which washing liquid exiting the condenser 44 (i.e. first passage 82) is guided through the extra outlet B 78 and via the tub nozzle 100 into the tub 8, wherein the washing liquid flows back to the sump 48 via the tub 8.

[0187] As shown in Figs. 7 to 9, the washing liquid is preferably guided through extra outlet A 76 and / or extra outlet B 78 when the heat pump is operated in the reverse mode. During the reverse mode, the washing liquid is cooled in the condenser 44, in particular in the first passage 82, and the cooled washing liquid is guided directly to the sump 48 via outlet A 76 and / or into the interior of the tub 8 via outlet B 78. The reverse mode of the heat pump enables regeneration of the heat exchanging medium in the evaporator tank 94, i.e. deicing of the heat exchanging medium and / or enables, during a drying phase, cooling of the tub 8 and / or the air within the tub resulting in an improved drying efficiency.

[0188] When e.g. washing liquid is guided along the first cooling branch 43a, the washing liquid preferably does not enter the interior of the tub 8 and thus does not substantially affect the air temperature in the interior of the tub 8. I.e. the cooled washing liquid does not cool the tub 8 and / or the air within the tub 8 when the heat pump is operated in the reverse mode and the washing liquid is guided along the first cooling branch 43a. Preferably, during a drying phase of a washing cycle, the washing liquid is guided along the second cooling branch 43b, wherein the cooled washing liquid cools the tub 8 and / or the air within the tub such that the humidity of the air condensates, and thus the drying process is improved. In this case, the drying process is improved in addition to the regeneration of the heat exchanging medium in the evaporator tank 94. When circulating the washing liquid along the second cooling branch 43b, the tub nozzle 100 is preferably adapted such that the washing liquid supplied into the tub interior does not contact the articles therein (thus articles are not cooled by the washing liquid).

[0189] The filtration assembly 40 may comprise a cover element 42. The cover element 42 is preferably adapted to cover at least a portion of the sump. At least a portion of the cover element 42 is arranged above the flow controller 64 covering and redirecting the respective outlets 70-78 of the flow controller 64. As shown in the bottom view in Fig. 11, the cover element 42 comprises inlets which are aligned with the outlets of the flow controller 64. One inlet connects the extra outlet A 78 to the sump nozzle 98 and one inlet connects the extra outlet B 76 to the tub nozzle 100. Further, the cover element 42 comprises one outlet for each oudet 70, 72, 74 for fluidly connecting to the spray devices such that the washing liquid can pass from the outlets 70, 72, 74 through the cover element 42 to the washing liquid conduit system and the respective spray device.

[0190] The cover element 42 has a portion formed as a filter adapted to filter washing liquid when it flows from the interior of the tub 8 through the filter to the sump 48.

[0191] As shown in Fig. 8, the cover element 42 may comprise a hub 96 arranged at the upper side of the cover element 42 and extending vertically or substantially vertically from the cover element 42. The hub 96 is adapted to connect the first outlet 70 to the lower spray device (not shown).

[0192] The tub nozzle 100 and / or the sump nozzle 98 are at least partially integrated in the cover element 42. Preferably, the cover element 42 and the sump nozzle 98 and / or the tub nozzle 100 are formed in a single piece, preferably fabricated from a plastic material. The sump nozzle 98 is preferably arranged at a lower surface of the cover element 42 and / or the tub nozzle 100 is preferably arranged at a top surface of the cover element 42.

[0193] The sump nozzle 98 is attachable to the extra outlet A 76 with a connection element (not specifically shown). Preferably the sump nozzle 98 simply fits the profile of the extra outlet A 76 by interlocking. The sump nozzle 98 is attachable to the extra outlet A 76 such that the washing fluid supplied to the extra outlet A 76 from the dishwasher tub 8 and sump 48 flows via a flow channel 102 back into the sump 48. When the cover element 42 is attached to the outlets, the flow channel 102 is preferably formed between the outlet A 76 and the sump nozzle 98. In particular, the bottom of the cover element 42 may include a first part of the flow channel 102 which is preferably integrated in the cover element 42, and a second part of the flow channel 102 which is preferably integrated in the sump 48 at the extra outlet A 76. The first part and the second parts are preferably configured such that when the cover element 42 is mounted at the sump 48, the first and second parts form the flow channel 102 for guiding washing liquid from the extra outlet A via the sump nozzle 98 into the sump 48. Preferably, the first part is formed in a single piece with the cover element 42 and / or the second part is formed in a single piece with the sump 48.

[0194] The extra outlet A 76 may extend vertical or substantially vertical from the sump 48, and a side wall of the outlet A 76 may comprise an aperture fluidly connecting the outlet A 76 to the flow channel 102.

[0195] The tub nozzle 100 is attachable to the extra outlet B 78 with a connection element (not specifically shown), preferably the tub nozzle 100 simply fits the profile of the extra outlet B 78 by interlocking. The tub nozzle 100 is attachable to the extra outlet B 78 such that the washing fluid supplied to outlet B 78 is guided into the interior of the tub 8 via the tub nozzle 100. The outlet of the tub nozzle 100 is preferably arranged such that the washing fluid exiting the tub nozzle 100 does not contact the articles in the dishwasher 2.

[0196] Flow controller

[0197] Fig. 10 is an exploded view of the sump 48 and the flow controller 64 of Fig. 9. The sump 48 includes a disk portion 110 formed within an external side of the sump 48. The flow controller 64 includes a disk 112, CAM disk 114, switch (not specifically shown), and motor 116. Disk portion 110 of sump 48 is sized and shaped to receive disk 112, CAM disk 114, switch, and motor 116. The motor 116 is configured to rotate the disk 112 relative to the washing fluid outlets 70, 72, 74, 76 and 78. The relative movement between the disk 112 and sump outlets 70-78 will be described in further detail herein. However, generally, in the exemplary embodiment, the control unit may signal to the switch and motor 116 to rotate CAM disk 114 at the intervals and times consistent with the dishwasher cycle and as a result, the disk 112 is selectably moved relative to the sump 48 and outlets 70-78.

[0198] The disk 112 may comprise a plurality of apertures 113 arranged for selectively closing and opening the plurality of washing fluid outlets 70, 72, 74 and the extra outlet A 76 and / or the extra outlet B 78 during rotation of the disk 112. Preferably, the motor 116 is adapted to align at least one of the plurality of apertures 113 of the disk 112 with at least one of the washing fluid outlets 70, 72, 74 and the extra outlet A 76 and / or the extra outlet B 78 such that washing liquid is permitted to pass through the aligned outlet(s).

[0199] A housing 118 of the flow controller 64 preferably fits around or envelops the disk 112 when the disk 112 is positioned within disk portion 110 of sump 48. In use, the disk 112 is located between the housing 118 and the sump 48. CAM disk 114, switch, and motor 116 are located within an internal compartment (not specifically shown) of the housing 118 such that at least the CAM disk 114 is in contact with the disk 112 through the housing 118. In other embodiments, the housing, the CAM disk, the switch, and the motor may have a different configuration. For example, the CAM disk, switch, and motor may be immediately adjacent to the disk 112 rather than separated by a portion of the housing body as presently disclosed. For example, the housing 118 is below the CAM disk 114, the switch, and the motor 116. Fig. 11 is a schematic view of the refrigerant circulation circuit 83 of the dishwasher of Fig. 5. The refrigerant circulation circuit 83 shown in Fig. 11 is similar to the refrigerant circulation circuit 83 shown in Fig. 7. The implementation of the first refrigerant circuit section 83a connecting the outlet 84b of the second passage 84 of the condenser 42 to the evaporator inlet 90a in Fig. 11 is different from Fig. 7. This difference is described in the following.

[0200] The refrigerant is directed between the evaporator 90 and the condenser 44 along the first refrigerant circuit section 83a. The refrigerant circuit section 83a may comprise a first refrigerant flow portion 89, 85a and a second refrigerant flow portion 89, 85b. In the normal operation mode, the refrigerant is directed from the condenser 44 along the first refrigerant flow path section 89, 85a to the evaporator 90 (normal refrigerant flow direction 31a indicated by black filled arrows). In the reverse operation mode, the refrigerant is directed from the evaporator 90 along the second refrigerant flow path section 89, 85b to the condenser 44 (reverted refrigerant flow direction 31b indicated by white filled arrows).

[0201] As shown in Fig. 11, each of the first and second flow path sections 89, 85a, 85b may comprise non-shared refrigerant flow path sections 85a, 85b (i.e. the refrigerant flows through the first non-shared refrigerant flow path section 85a only in the normal operation mode, and through the second non-shared refrigerant flow path section 85b only in the reverse operation mode) and a common (shared) refrigerant flow path section 89.

[0202] In the common flow path section 89, the refrigerant directions in the normal and reverse operation modes are the same. The expansion arrangement 88 is arranged in the common flow path section 89. A filter arrangement 158 comprising a first filter 93 arranged in the first nonshared flow path section 85a and a second filter 93 arranged in the second non-shared flow path section 85b may be provided. Preferably each filter 93 is arranged upstream of the expansion arrangement 88. 1.e. in this example, in the normal operation mode, the refrigerant flows from the evaporator 94 through the first filter 93 arranged in the first non-shared flow path section 85a, then through the expansion arrangement 88 arranged in the common flow path 89 and then to the condenser 44. In the reverse operation mode, the refrigerant flows from the condenser 44 (working as evaporator) through the second filter 93 arranged in the second non-shared flow path section 85b, then through the expansion arrangement 88 arranged in the common flow path 89 and then to the evaporator 94. The flow direction in the common flow path 89 is the same in both operation modes. Alternatively to the first and second filters 93, a common filter arrangement may be arranged in the common refrigerant flow path section 89. In the normal and reverse operation modes, the refrigerant flows through the expansion arrangement 88.

[0203] In the shown example of Fig. 11, the expansion arrangement 88 comprises a non-controllable or fixed expansion device like a capillary tube. Alternatively, the expansion arrangement 88 may comprise a controllable expansion device such as an electronic expansion device.

[0204] Flow rectifier means 91 such as check valves / one-way valves may be provided in the first and second refrigerant flow path sections 89, 85a, 85b of Fig. 11 (see also Figs. 13 and 14) for passing the refrigerant through either the first flow path section 89, 85a in the normal operation mode or through the second flow path section 89, 85b in the reverse operation mode. The check valves 91 are shown in Fig. 11 as triangles, wherein the refrigerant can only pass through the check valves in one direction, namely in the direction of the tip of the triangles.

[0205] The dishwasher 2 may comprise a control unit adapted to operate the dishwasher and to switch the refrigerant flow changing device 86 to the normal operation mode of the heat pump such that the refrigerant is flowing in the first flow direction 31a and to the reverse operation mode of the heat pump such that the refrigerant is flowing in the second flow direction 31b.

[0206] Further, when the expansion device 88 is a controllable expansion device, the appliance may comprise a temperature sensor and / or a pressure sensor (not shown), wherein one or both sensors are preferably arranged between the inlet 92a of the compressor and the refrigerant flow changing device 86. The control unit may be adapted to receive temperature and / or pressure signals from the sensors and to adjust the opening state of the electronic expansion device 88 based on an algorithm in dependency of the detected temperature (Tref) and / or pressure. Alternatively, the expansion device 88 may be a thermostatic expansion device, wherein the thermostatic expansion device is adapted to adjust its opening state in dependency of the refrigerant temperature and / or pressure measured by the sensors (i.e. in this case the control unit is not necessary for controlling the expansion device since the thermostatic expansion device is directly adjusted by the measured temperature / pressure of the refrigerant).

[0207] Due to the controllable expansion device, it is possible to adjust the refrigerant flow through the device and thus to adjust the pressures and / or temperature of the heat pump system as required in each of the normal and reverse operation modes. Therefore, the efficiency of the system can be improved.

[0208] Fig. 12 is a perspective view of the basement 6 of the dishwasher of Fig. 5. The basement 6 may comprise a lower housing 6a and a top cover element 6b covering or essentially covering the inner space of the basement 6, and in particular of the lower housing 6a, at the top side. Preferably the top cover element 6b covers the lower housing 6a such that liquid flowing or dripping from above the basement 6 (e.g. from inside the space of the upper frame) is screened against entering into the inner space of the basement 6. The top cover element 6b may reduce noises of the compressor 92 arranged within the basement 6.

[0209] Preferably, an upper surface of the top cover element 6b is configured to collect a liquid therein. Preferably, the upper surface of the top cover element 6b forms a trough 122 (in particular a trough 122 towards the center or essentially towards the center of the top cover element 6b) configured to collect a liquid therein, and in particular a liquid flowing or dripping from above the basement 6 (e.g. from inside the space of the upper frame 7). A leak detector 120 may be arranged at the upper surface of the top cover element 6b, e.g. within the trough 122, wherein the leak detector 120 is configured to detect the presence of liquid collected at the upper surface of the top cover element 6b or in the trough 122. As shown in Figs. 19 and 20, the upper frame 7 may comprise an opening or encloses an inner space 151 such that liquid flowing or dripping from above the upper frame 7 can flow or drip through the upper frame 7 and can collect at the upper surface of the top cover element 6b, and in particular in the trough 122 of the top cover element 6b, which is arranged below the upper frame. Thus, if the leak detector detects the presence of liquid at the upper surface of the top cover element 6b and in particular in the trough 122, the control unit is adapted to stop operation of the dishwasher 2, and in particular to close a water supply valve such that the water supply to the dishwasher 2 is stopped. More preferably, the dishwasher 2 comprises a control unit, wherein, in response to a signal of the leak detector 120, the control unit is adapted to disconnect the dishwasher 2 from the power mains. Thus, it can be avoided that a user comes into contact with charged water and thus prevent possible injuries to the user. The leak detector may detect when the liquid collected at the upper surface of the top cover element 6b exceeds a predefined liquid level. This prevents water from accumulating in the dishwasher to such an extent that it can flow out of the dishwasher, thereby preventing water damage. In addition, further damage to the dishwasher components can be prevented.

[0210] As shown in Figs. 5, 6, 12 to 14, all water guiding components are preferably supported by the upper frame 7 and / or are arranged in the upper cabinet 9 of the dishwasher 2 above the top cover element 6b of the basement 6. Preferably, the water-guiding components comprise one or more of the following: the sump 48, the circulation pump 50, the draining pump 60, the washing liquid conduit system 22 comprising the one or more spray devices 26a, 28a, 30a, the flow manifold or flow controller 64, and the water piping connecting the water-guiding components. Thus, as all water guiding components are arranged in the upper cabinet above the basement 6, the assembly of the dishwasher is simplified. In particular, pre-assembly of the upper frame 7 and all components above the upper frame 7 independently of the basement 6 is possible. Further, if there is any leakage in the water guiding elements, the water collects in the trough below, which means that a leak in the water guiding elements does not remain unnoticed and the control unit can react accordingly.

[0211] Arrangement of heat pump components in the basement:

[0212] Fig. 13 is a perspective view of the basement of Fig. 12 without the top cover element 6b, and Fig. 14 is a top view of the basement of Fig. 13 without the top cover element. The refrigerant circulation circuit 83 corresponds to the schematic view shown in Fig. 11 such that the features described with respect to Fig. 11 are also valid for the following Figures. Therefore, in the following only features regarding the arrangement of the different components and structural implementations are described.

[0213] As shown in Figs. 13 and 14, preferably all heat pump components (except the condenser 44 and the piping connecting the condenser 44 to the heat pump components in the basement 6) such as the compressor 92, the expansion arrangement 88, the refrigerant flow changing device 86, the evaporator tank 94 and the refrigerant piping connecting the heat pump components are arranged within the basement 6. Thus, the assembly of the dishwasher 2 is simplified. In particular, pre-assembly of the basement 6 independently of the upper frame 7 and / or upper cabinet 9 is therefore possible. After pre-assembly of the basement 6, the condenser 44 in the upper cabinet 9 only needs to be connected to the heat pump components in the basement using refrigerant pipes.

[0214] Preferably, the refrigerant flow changing device 86 and / or the expansion arrangement 88 is arranged in the basement 6 (lower housing 6a) next to the compressor 92 (see Figs. 13 and 14). As shown in Figs. 14 and 15, the compressor 92, the refrigerant flow changing device 86 (and optionally the expansion arrangement 88) are arranged on the same side of the evaporator 94. Preferably, the refrigerant flow changing device 86 is arranged in proximity to the condenser inlet 84a. Thus, the refrigerant piping between the compressor 92 and the refrigerant flow changing device 86 is shortened.

[0215] As shown in Figs. 14 to 17, the dishwasher 2 preferably comprises an evaporator module 124 comprising or housing the evaporator tank 94 which is arranged within the basement 6. The evaporator tank 94 may be covered and preferably closed by the evaporator tank cover 95 (see Figs. 15 and 17).

[0216] The evaporator module 124 may comprise a lower module shell 126 configured to house (or forming) at least the evaporator tank 94. As shown in Figs. 16 and 17, the lower module shell 126 is preferably configured to support the refrigerant flow changing device 86 and / or the expansion valve 88. In particular, the lower module shell 126 comprises a support region 128 extending from the evaporator tank 94. The support region 128 may form a condensate collection tray adjacent to the evaporator tank 94 which is adapted to support at least the refrigerant flow changing device 86. As shown in Figs. 14 and 16, the refrigerant flow changing device 86, and optionally the expansion device 88, is (are) arranged within the condensate collection tray 128. The condensate collection tray 128 may be configured to collect condensate, in particular condensate forming at the refrigerant flow changing device 86, during operation of the dishwasher 2. The condensate collection tray 128 is preferably designed to be open at the top (i.e. there is no cover element covering the top of the collection tray).

[0217] Preferably, the lower module shell 126 comprising the evaporator tank 94 and the condensate collection tray 128 is formed in a single piece. Preferably, at least a portion of a side wall of the evaporator tank 94 forms a side wall of the condensate collection tray 128.

[0218] Preferably, the compressor 92 is arranged within the basement 6 (in particular lower housing 6a) external to the evaporator module 124 on a support region 154 (see Fig. 16). Thereby the compressor 92 and the evaporator module 124 (comprising the evaporator tank 94 with the evaporator 90, and the refrigerant flow changing device 86 and optionally the expansion arrangement 88), are vibrationally separated.

[0219] Fig. 15 is a sectional view of the basement of Fig. 14 along line B-B with the top cover element 6b. As shown in Fig. 15, the evaporator tank 94 and in particular the evaporator module 124 is thermally insulating. In particular, the lower module shell 126 of the evaporator module 124 may comprise a tray element insulation layer 134 and / or the evaporator tank cover 95 comprises the evaporator tank cover insulation layer 132.

[0220] Preferably, the tray element insulation layer 134 and / or the evaporator tank cover insulation layer 132 are arranged on an outer surface of the lower module shell 126 and / or the evaporator tank cover 95. The top cover element 6b of the basement may comprise an insulation layer 130, preferably arranged at an inner surface of the top cover element 6b. The condensate collection tray 128 may be thermally insulating at least at a portion of its surface or is at least partially covered with a thermally insulating layer. In particular, a portion of a side wall between the evaporator tank 94 and the condensate collection tray 128 is thermal insulated by the insulation layer 136 (see Fig. 15). The insulation layer(s) keep the heat in the basement 6 which increases the efficiency of the dishwasher's heat pump.

[0221] The lower housing 6a of the basement may comprise rib elements 142 on an inner surface which are configured to provide an air gap between the bottom internal surface of the bottom wall and a bottom surface of the evaporator tank 94 and / or the condensate collection tray 128. At least a portion of the outer walls and / or a bottom wall of the basement (lower housing 6a) is double-walled with an air gap in between.

[0222] Fig. 18 is a perspective view of the evaporator tank cover 95 of the evaporator tank 94 Fig. 17. The evaporator tank cover 95 may comprise apertures 153 through which refrigerant pipes which are connected to the evaporator 90 housed in the evaporator tank 94 may extend.

[0223] Preferably, the evaporator tank cover 95 comprises one or more mounting elements 140 for mounting refrigerant circuit components such as the check valves 91 or the filters 93 and / or refrigerant piping elements on an outer surface of the evaporator tank cover 95. A refrigerant circuit component may be any element within the refrigerant circulation circuit 83 that guides the refrigerant except the refrigerant piping. The refrigerant circuit components may be mounted in the mounting elements 140 by e.g. screwing, clamping, or the like. As shown in Fig. 14, the first and second filters 93 and the check valves 91, in particular four check valves, are mounted via the mounting elements 140 on the outer surface of the evaporator tank cover 95.

[0224] Preferably the mounting elements 140 provide a mounting site for mechanically fixing the refrigerant pipe(s) and / or the refrigerant circuit components 91, 93. This prevents a relative movement between the pipes (and / or the refrigerant circuit components 91, 93) and the evaporator tank 94. This avoids formation of leaks at passages of the refrigerant pipes into / out of the evaporator tank.

[0225] In addition or alternatively, the evaporator tank cover 85 may comprise one or more recesses 138 for receiving therein refrigerant circuit components such as the check valves 91 or the filters 93 and / or refrigerant piping elements. As shown in Figs. 14 and 18, the evaporator tank cover 85 may comprise the recesses 138 which are formed as indentations in the evaporator tank cover 95. More preferably, the mounting elements 140 are arranged at the recesses 138 such that the check valves or the filter 91, 93 received in the respective recess 138 can be fixed in the recess 138 via the mounting element(s) 140. Due to the recesses 138, the refrigerant circuit components 91, 93 protrude less upwards from the evaporator tank cover 95, which means that less space is taken up by the refrigerant circuit components 91, 93 above the evaporator tank cover 95. Thus, space can be saved within the basement 6 of the dishwasher.

[0226] Upper frame:

[0227] Fig. 19 is a perspective view of the upper frame of the dishwasher of Fig. 5 and Fig. 20 is another perspective view of the upper frame of Fig. 19. The upper frame 7 is preferably configured to support the tub 8 and / or the elements of the upper cabinet 9, wherein the lower housing 6a of the basement is configured to support the upper frame 7.

[0228] The upper frame 7 preferably comprises an opening and / or encloses an inner space 151. The inner space 151 is preferably configured such that in a mounted state of the dishwasher 2 liquid flowing or dripping from above the upper frame 7 can flow or drip through the upper frame 7 and can collect at the upper surface of the top cover element 6b (e.g. in the trough 122 of the top cover element 6b) of the basement 6 which is arranged below the upper frame 7. Preferably, components of the dishwasher 2 supported by the upper frame 7 and / or the tub 8, for example the circulation pump 50, the sump 48, and / or the drain pump 60 may extend at least partially into the inner space 151 of the upper frame (i.e. no components of the dishwasher 2 supported by the upper frame 7 extend through the inner space 151 to below the upper frame 7).

[0229] As shown in Figs. 19 and 20, the upper frame 7 may comprise a pump mount 164 which is configured to receive and / or support the circulation pump 50. The upper frame 7 may comprise support elements 162 configured to support the tub 8 and / or upper cabinet 9 of the dishwasher 2. In particular, the upper frame 7 may comprise four support elements 162, wherein one support element 162 is arranged in each comer of the upper frame 7. The support element 162 may extend vertical or substantially vertical from an upper surface of the upper frame 7. The tub 8 may comprise corresponding receiving elements which are configured to receive the support elements 162 of the upper frame 7 when the tub is mounted onto the upper frame 7. The upper frame 7 (i.e. the support elements 162) may be connected to the tub 8 (i.e. the receiving elements of the tub 8) for example by screwing or by snapping in. Pivoting of upper cabinet:

[0230] Fig. 21 is a perspective view of the dishwasher of Fig. 1 in a pivoted state of the upper frame, and Fig. 22 is another perspective view of the dishwasher of Fig. 21.

[0231] As shown in Figs. 23, 24 and also in Fig. 13, the dishwasher 2 may comprise a refrigerant piping extending between the condenser 44 and the basement 6. In particular, the refrigerant piping may comprise a first pipe section 144b connected to the refrigerant inlet 84a of the condenser 44 and a second pipe section 144a connected to the refrigerant outlet 84b of the condenser 44. Preferably, the upper frame 7 is pivotably connected to the basement 6, and in particular to the lower housing 6a, such that the upper frame 7 and the dishwasher components supported by the upper frame and / or the upper cabinet 9 are pivotable around a pivot axis A (see Figs. 21 to 23) so that the condenser moves together with the upper frame. The first and second pipe sections 144a, 144b connect the condenser 44 to the heat pump components arranged in the basement 6. At least a portion of the first and second pipe sections 144a, 144b may be flexible and may be configured to maintain the fluid connection between the condenser 44 and the heat pump components in the basement 6 during pivoting the upper frame 7 relative to the basement 6. 1.e. when the upper frame 7 is pivoted, at least a portion of the first and second pipe sections 144a, 144b which is flexible bends (cf. Figs. 23 and 24). By the upper frame 7 being pivotable, the components supported by the upper frame 7 are pivotally connected to the basement 6. The pivoting of upper frame 7 simplifies maintenance of the dishwasher 2. In particular, the upper frame 7 and thus the tub 8 and / or the upper cabinet 9 can be pivoted relative to the basement 6 so that the basement 6 and / or the components of the dishwasher in the lower region of the upper cabinet 9 or in the upper frame 7 can be accessed quickly and easily.

[0232] As shown in the Figure 13, the condenser 44 is preferably the sole and only component of the heat pump system which is supported by the upper frame 7 and / or the upper cabinet 9.

[0233] As shown in Figs. 20, 23 and 24, the upper frame 7 may be pivotably connected to the basement 6, preferably via a hinge arrangement 160. The hinge arrangement 160 may comprise a first hinge portion 160a mounted at the basement 6, and in particular at the lower housing 6a (cf. Fig. 16) and a second hinge portion 160b mounted at the upper frame 7. The first hinge portion 160a may be arranged at an upper edge of the lower housing 6b and / or the second hinge portion 160b may be arranged at a lower edge of the upper frame 7. The first and / or second hinge portions 160a, 160b may comprise a plurality of hinge elements. The first and second hinge portions 160a, 160b may be pivotably connected to each other such that the upper frame 7 is pivotable relative to the basement 6. For example, the first and second hinge portions 160a, 160b can be connected to each other by one or more connection elements 161 such as rod elements. Figs. 1 and Fig. 24 show the dishwasher 2 in a non-pivoted position, i.e. in an operation position and Figs. 21 to 23 show the dishwasher 2 in a pivoted position. Preferably, the upper frame 7 is pivotably around the pivot axis A by an angle in the range between 0°-140°, 0°-120°, 0°-110° or 0°-90°.

[0234] As shown in Fig. 20, the upper frame 7 may comprise recesses 150 which are arranged at a lower surface of the upper frame 7, wherein, in a mounted state, i.e. non-pivoted position, the recesses 150 are configured to receive pin elements 152 arranged at an upper surface of the basement 6, and in particular at an upper surface of the lower housing 6a. Preferably, the recesses 150 of the upper frame 7 and the pin elements 152 of the basement 6 are arranged on a side opposite to the hinge arrangement 160. Optionally, the upper frame 7 and / or the basement 6 may comprise a locking element (not shown) which is configured to secure the upper frame 7 in the non-pivoted position.

[0235] Preferably, the first and / or second pipe sections 144a, 144b each comprise a first leg portion 146 and a second leg portion 147 connected to each other by a flexible arc portion 148. Preferably, when the upper frame 7 is pivoted (as shown in Fig. 16), the first and second leg portions 146, 147 of the first and / or second pipe sections 144a, 144b are pivoted against each other by bending of the arc portion 148. The flexible arc portion 148 of the first and second pipe sections 144a, 144b may bend around the pivoting axis A and the pivoting axis A is preferably perpendicular or substantially perpendicular to the plane of the flexible arc portion 148 (i.e. the plane in which the flexible arc portion 148 extends).

[0236] Preferably, the maximum distance between the pivoting axis A and the flexible arc portion 148 or the first and second pipe sections 144a, 144b is ± 8 cm, ± 6 cm, ± 4 cm, or ± 1 cm. The distance is preferably the distance between the middle region of the arc portion 148 or the first and second pipe sections 144a, 144b and the pivot axis A. By arranging the flexible pipe sections 144a, 144b as close as possible at the pivoting axis A the required length of the flexible pipe sections 144a, 144b is kept low and / or the required 'free' space through which the flexible pipe sections have to move during a pivoting activity is minimized. The refrigerant leakage risk by using flexible refrigerant piping is minimized and / or 'flexing' space is within the anyway rare useable component space within the dishwasher cabinet is minimized.

[0237] As shown in Figs. 16 and 19, recesses 166, 168 for receiving at least a portion of the first and / or second pipe sections 144a, 144b may be provided at the hinge arrangement 160, and in particular at the lower housing 6a of the basement 6 and / or the upper frame 7. In particular, each recess 166, 168 may be configured such that the first and / or second pipe sections 144a, 144b connected to the condenser 44 may extend from the condenser 44 to the heat pump components arranged in the basement 6 (i.e. in the lower housing 6a). As shown in Fig. 16, the top cover element 6b of the basement may comprise recesses 170 or apertures adjacent to the hinge arrangement 160 which are configured to receive at least a portion of the first and second pipe sections 144a, 144b. The recesses 170 may be configured such that the first and second pipe sections 144a, 144b may extend into the interior of the basement 6.

[0238] Preferably electric connection lines that extend between the upper cabinet 9 and the basement

[0239] 6 are also arranged at or close to the pivot axis A. Preferably such electric connection lines are one or more of: power and control lines for the compressor connected between the compressor and a power and control board of the compressor arranged in the upper cabinet 9, sensor lines of the leak detector 20, sensor lines for detecting the temperature at a position of the refrigerant circuit, and control line to the controllable expansion valve 88.

[0240] Reference Numeral List

[0241] 2 dishwasher

[0242] 4 control panel

[0243] 6 basement (lower cabinet)

[0244] 6a lower housing

[0245] 6b top cover element

[0246] 7 upper frame

[0247] 8 tub

[0248] 9 upper cabinet

[0249] 10 side wall (tub)

[0250] 14 top wall (tub)

[0251] 16 tub bottom

[0252] 18 door

[0253] 20 internal air circulation path

[0254] 20a inlet

[0255] 20b outlet

[0256] 20c blower

[0257] 22 washing liquid conduit system

[0258] 24 delivery conduit

[0259] 26 connector to top spray device

[0260] 26a top spray device / top spray arm or nozzle

[0261] 28 connector to middle spray device

[0262] 28 a middle spray device I middle spray arm

[0263] 30 connector to lower spray device

[0264] 30a lower spray device / lower spray arm

[0265] 31a, 31b normal (reverted) refrigerant flow direction

[0266] 32 washing liquid flow direction

[0267] 40 filtration assembly

[0268] 42 cover element

[0269] 43 washing liquid cooling path

[0270] 43a, 43b first I second cooling branch

[0271] 44 condenser

[0272] 46 fresh water tank assembly

[0273] 46a connection to tub

[0274] 48 sump

[0275] 50 circulation pump 52 softener assembly

[0276] 54a outlet to salt container

[0277] 54b outlet to resin container

[0278] 56 flow connection to sump

[0279] 58 flow meter

[0280] 59 draining circuit

[0281] 60 drain pump

[0282] 62a-c first / second I third draining path sections

[0283] 64 flow manifold / flow controller

[0284] 66 inlet of flow controller

[0285] 68a, 68b first I second fluid flow path

[0286] 70 first washing fluid outlet

[0287] 72 second washing fluid outlet

[0288] 74 third washing fluid outlet

[0289] 76 fourth washing fluid outlet I extra outlet A

[0290] 78 fifth washing fluid outlet I extra outlet B

[0291] 79 drain outlet

[0292] 80a-c first, second, third section of condenser

[0293] 81 spacing element

[0294] 82 first passage (for washing liquid, e.g. outer tube of condenser)

[0295] 82a inlet of first passage

[0296] 82b outlet of first passage

[0297] 83 refrigerant circulation circuit

[0298] 83a-f first, second, third, fourth, fifth, sixth refrigerant circuit section

[0299] 84 second passage (for refrigerant, e.g. inner tube of condenser)

[0300] 84a inlet (outlet) of second passage

[0301] 84b outlet (inlet) of second passage

[0302] 85a, 85b (first / second) non-shared refrigerant flow path

[0303] 86 refrigerant flow changing device / switching valve

[0304] 86a, 86b first / second inlet of refrigerant flow changing device

[0305] 87a, 87b first / second outlet of refrigerant flow changing device

[0306] 88 expansion arrangement (expansion device or valve)

[0307] 89 common (shared) refrigerant flow path

[0308] 90 evaporator

[0309] 90a evaporator inlet

[0310] 90b evaporator outlet

[0311] 91 flow rectifier means (e.g. check valve / one-way valve)

[0312] 92 compressor 92a, b inlet / outlet of compressor

[0313] 93 first / second filter

[0314] 94 evaporator tank

[0315] 95 evaporator tank cover

[0316] 96 hub for lower spray device

[0317] 98 sump nozzle

[0318] 100 tub nozzle

[0319] 102 flow channel

[0320] 110 disk portion

[0321] 112 disk

[0322] 113 aperture of disk

[0323] 114 CAM disk

[0324] 116 motor

[0325] 118 housing of flow controller

[0326] 120 leak detector

[0327] 122 trough

[0328] 124 evaporator module

[0329] 126 lower module shell

[0330] 128 support region (condensate collection tray)

[0331] 130 top cover element insulation layer

[0332] 132 evaporator tank cover insulation layer

[0333] 134 tray element insulation layer

[0334] 136 condensate collection tray insulation layer

[0335] 138 recess for receiving refrigerant circuit component

[0336] 140 mounting element

[0337] 142 rib element

[0338] 144a, 144b first I second pipe section

[0339] 146 first leg portion

[0340] 147 second leg portion

[0341] 148 arc portion

[0342] 150 recess for pin element

[0343] 151 inner space of upper frame

[0344] 152 pin element

[0345] 153 opening for refrigerant pipes

[0346] 154 compressor support region

[0347] 160 hinge arrangement

[0348] 160a first hinge portion

[0349] 160b second hinge portion 161 connection element (rod element)

[0350] 162 support element

[0351] 164 pump mount

[0352] 166 recess at upper frame 168 recess at lower housing

[0353] 170 recess at evaporator tank cover (aperture)

[0354] A pivoting axis

Claims

Claims:

1. Dishwasher (2), comprising: a tub (8) for washing articles therein, a basement (6) arranged below the tub (8) and comprising a lower housing (6a) and a top cover element (6b) at least partially covering the lower housing (6a), a heat pump system having a compressor (92), an evaporator (90), an expansion valve (88), a refrigerant flow changing device (86), and a condenser (44), an evaporator tank (94) configured to store a heat exchanging medium and to house at least a portion of the evaporator (90), wherein the evaporator tank (94) is covered and preferably closed by an evaporator tank cover (95), and refrigerant piping fluidly connecting the components of the heat pump system, wherein the compressor (92), the evaporator tank (94), the expansion valve (88) and the refrigerant flow changing device (86) are arranged within the lower housing (6b) of the basement (6), and wherein a) the refrigerant flow changing device (86) is a refrigerant circuit component which is arranged in the basement (6) next to the compressor (92), and / or b) the refrigerant flow changing device (86) is arranged in a condensate collection tray (128), and / or c) the evaporator tank cover (95) comprises one or more mounting elements (138, 140) for mounting refrigerant circuit components and / or refrigerant piping elements on the evaporator tank cover (95).

2. Dishwasher of claim 1 , wherein the refrigerant flow changing device (86) is adapted to change the refrigerant flow direction through the heat pump system between a normal operation mode of the heat pump and a reverse operation mode of the heat pump system, wherein in the normal operation mode of the heat pump system, the condenser (44) is adapted to heat the washing liquid when the washing liquid is circulated through the condenser (44), preferably a first passage (82) of the condenser (44), and the evaporator (90) is adapted to cool the heat exchanging medium, andwherein in the reverse operation mode of the heat pump system, the condenser (44) is adapted to cool the washing liquid when the washing liquid is circulated through the condenser (44), preferably the first passage (82) of the condenser (44), and the evaporator (90) is adapted to heat the heat exchanging medium.

3. Dishwasher of claim 1 or 2, wherein the mounting elements (138, 140) comprise protruding elements (140) configured to hold refrigerant circuit components and / or refrigerant piping elements and / or one or more recesses (138) for receiving therein refrigerant circuit components and / or refrigerant piping elements.

4. Dishwasher of claim 1, 2 or 3, further comprising an evaporator module (124) having a lower module shell (126) configured to support the refrigerant flow changing device (86), the expansion valve (88) and the evaporator tank (94), and wherein the evaporator module (124) is arranged within the lower housing (6b) of the basement.

5. Dishwasher of claim 4, wherein the lower module shell (126) comprises an extension forming a or the condensate collection tray (128) adjacent to the evaporator tank (94) which is adapted to support the refrigerant flow changing device (86) and the expansion device (88), wherein preferably a portion of the side wall of the evaporator tank (94) between the condensate collection tray (128) and the evaporator tank (94) is thermal insulated.

6. Dishwasher of claim 5, wherein an air gap is provided between a lower surface of the condensate collection tray (128) and the refrigerant flow changing device (86).

7. Dishwasher of any of claims 4 to 6, wherein the compressor (92) is arranged within the lower housing (6b) of the basement external to the evaporator module (124).

8. Dishwasher of any of the preceding claims, wherein the evaporator tank cover (95) comprises apertures (153) through which refrigerant pipes which are connected to the evaporator (90) housed in the evaporator tank (94) extend.

9. Dishwasher of any of the preceding claims, wherein an upper surface of the top cover element (6b) is configured to collect a liquid therein, and wherein a leak detector (120) is arranged at the upper surface of the top cover element (6b) and is adapted to detect an accumulation of liquid at the top cover element (6b).

10. Dishwasher of any of the preceding claims, wherein the lower housing (6a) has outer walls and / or a bottom wall forming a lower cabinet of the dishwasher cabinet, wherein preferably the lower housing (6a) is at least partially covered by the top cover element (b)11. Dishwasher of claim 10, wherein at least a portion of the outer walls and / or a bottom wall is double-walled with an air gap in between.

12. Dishwasher of any of the preceding claims, wherein a or the bottom wall of the lower housing (6a) comprises rib elements (142) configured to provide an air gap between the bottom internal surface of the bottom wall of the lower housing (6a) and a bottom surface of the evaporator tank (94) and / or a or the evaporator module (124).

13. Dishwasher of any of the preceding claims, wherein the condenser (82) comprises a or the first passage configured to circulate the washing liquid and a second passage (84) configured to circulate the refrigerant, wherein the first and second passages (82, 84) are in heat-exchanging contact with each other, wherein preferably the condenser is a tube-in-tube condenser.

14. Dishwasher of any of the preceding claims, wherein the condenser (44) is arranged at a side wall or at the back wall of the tub (8), preferably at the outside of the tub between the tub wall and an outer wall of the dishwasher's cabinet, wherein preferably the condenser (44) extends in a vertical or substantially vertical plane.

15. Dishwasher of any of the preceding claims, wherein the dishwasher further comprises: an upper frame (7) configured to support the tub (8), wherein the condenser (44) is supported by the upper frame (7) above the top cover element (6b), wherein in particular the water piping connecting all water guiding components extend above the top cover element (6b).

16. Dishwasher of claim 15, wherein the upper frame (7) is pivotably connected to the basement (6) or the lower housing (6a) such that the upper frame (7) and the dishwasher components supported by the upper frame are pivotable around a pivot axis (A) so that the condenser (44) moves together with the upper frame (7).

17. Dishwasher of claim 15 or 16, further comprising a refrigerant piping fluidly connecting the components of the heat pump system and comprising a first and second pipe section (144a, 144b) connected to the condenser (44),wherein the first and second pipe section (144a, 144b) connect the condenser to the heat pump components arranged in the basement (6) and wherein at least a portion of the first and second pipe section (144a, 144b) is flexible and configured to maintain the fluid connection between the condenser and the heat pump components in the basement (6) during pivoting the upper frame (7) relative to the basement.

18. Dishwasher of any of the preceding claims, further comprising water-guiding components comprising a sump (48) for collecting washing liquid from the tub (8) and a circulation pump (50), wherein the sump (48) and the circulation pump (50) are arranged in an upper cabinet (9) of the dishwasher above the top cover element (6b) of the basement and / or are supported by a or the upper frame (7).

19. Dishwasher of any of the preceding claims, wherein all water guiding components are supported by a or the upper frame (7) and / or are arranged in an upper cabinet (9) of the dishwasher above the top cover element (6b) of the basement, and / or wherein said water guiding components comprises one or more or all of the following components:- a draining pump (60),- one or more spray devices arranged within the tub (8),- a water diverter and / or flow controller (64),- a or the first passage (82) of the condenser (44) for circulating the washing liquid, and- water piping connecting the water- guiding components.

20. Dishwasher of any of the preceding claims, wherein the refrigerant flow changing device (86) and / or the expansion device (88) is a refrigerant circuit component which is arranged in the basement (6) next to the compressor (92), and / or wherein the basement (6) comprises a first support area adapted to support the evaporator tank (94), a second support area adapted to support the compressor (92) and a third support area adapted to support the refrigerant flow changing device (86) and / or the expansion valve (88), and wherein the refrigerant flow changing device (86) and / or the expansion valve (88) and the compressor (92) are arranged on the same side of the evaporator tank (94).

21. Dishwasher of any of the preceding claims, wherein the dishwasher (2) comprises cooling means for cooling the compressor (92), and wherein preferably the cooling means arefluidly connected to ambient air for cooling the compressor by exchanging heat with the ambient air.

22. Dishwasher of any of the preceding claims, wherein the dishwasher (2) further comprises a control unit, and wherein, in response to a signal of the leak detector (120), the control unit is adapted to stop operation of the dishwasher (2), and in particular to close a water supply valve such that the water supply to the dishwasher (2) is stopped, and / or wherein, in response to a signal of the leak detector (120), the control unit is adapted to disconnect the dishwasher (2) from the power mains.

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