dishwasher

Abstract

The present invention discloses a dishwasher and relates to the technical field of dishwashers. The dishwasher includes a dishwasher body and a heat pump system. The dishwasher body has a washing chamber, an internal circulation air duct, and a spraying system. Each of an air inlet and an air outlet of the internal circulation air duct is in communication with the washing chamber. The heat pump system includes a compression device, a switching device, a first heat exchange device, a second heat exchange device, an air cooling device, and an air heating device. The compression device forms a first circulation heat exchange loop with the first heat exchange channel and the second heat exchange device through the switching device. The compression device forms a second circulation heat exchange loop with the air heating device and the air cooling device through the switching device. The air cooling device and the air heating device are sequentially arranged in the internal circulation air duct in a direction from the air inlet to the air outlet. In the present invention, washing and drying efficiency, flexibility, and an energy utilization rate of the dishwasher can be improved by using independent heat exchange component in each of washing and drying stages of the dishwasher.

Description

FIELD

[0001] The present invention relates to the technical field of dishwashers, and in particular, to a dishwasher.BACKGROUND

[0002] A heat pump dishwasher typically has two modes or stages comprising washing and drying. After washing is completed, an interior of the dishwasher is filled with humid air with high relative humidity and a high temperature and liquid water droplets adhering to a surface of tableware. Therefore, activation of the drying mode is required. However, in the related art, the heat pump dishwasher suffers from low efficiency in both washing and drying processes.SUMMARY

[0003] A main objective of the present invention is to provide a dishwasher, aiming to improve washing and drying efficiency of the dishwasher.

[0004] To achieve the above-mentioned objective, the dishwasher according to embodiments of the present invention comprises a dishwasher body and a heat pump system. The dishwasher body has a washing chamber, an internal circulation air duct, and a spraying system. The internal circulation air duct has an air inlet and an air outlet, and each of the air inlet and the air outlet is in communication with the washing chamber. The spraying system is configured to spray washing water into the washing chamber to clean tableware placed in the washing chamber. The heat pump system comprises a compression device, a switching device, a first heat exchange device, a second heat exchange device, an air cooling device, and an air heating device. The first heat exchange device has a first heat exchange channel and a second heat exchange channel that are arranged for heat exchange with each other. The compression device forms a first circulation heat exchange loop with the first heat exchange channel and the second heat exchange device through the switching device, and the compression device forms a second circulation heat exchange loop with the air heating device and the air cooling device through the switching device. The second heat exchange channel is in communication with the spraying system. The air cooling device and the air heating device are sequentially arranged in the internal circulation air duct in a direction from the air inlet to the air outlet. The switching device is configured to: control, during a washing stage, refrigerant discharged from the compression device to pass through the first circulation heat exchange loop; and control, during a drying stage, the refrigerant discharged from the compression device to pass through the second circulation heat exchange loop.

[0005] In an embodiment, the first heat exchange device may comprise a casing and a first heat exchange element disposed in the casing.

[0006] In an embodiment, the first heat exchange channel may be defined by the first heat exchange element.

[0007] In an embodiment, the second heat exchange channel may be formed between the casing and the first heat exchange element.

[0008] In an embodiment, the switching device comprises a first port, a second port, and a third port.

[0009] In an embodiment, the first port is configured to be in communication with a discharge port of the compression device.

[0010] In an embodiment, the second port is configured to be in communication with the first heat exchange channel of the first heat exchange device.

[0011] In an embodiment, the third port is configured to be in communication with the air heating device.

[0012] In an embodiment, during the washing stage, the first port may be in communication with the second port and isolated from the third port, and during the drying stage, the first port may be in communication with the third port and isolated from the second port.

[0013] In an embodiment, the heat pump system may comprise a first throttling device disposed on a flow path between the first heat exchange device and the second heat exchange device; and / or the heat pump system may comprise a second throttling device disposed on a flow path between the air heating device and the air cooling device.

[0014] In an embodiment, the second heat exchange device may comprise a second heat exchange element and a second fan configured to supply air to the second heat exchange element.

[0015] In an embodiment, the air cooling device may comprise a third heat exchange element and a third fan configured to supply air to the third heat exchange element.

[0016] In an embodiment, the air heating device may comprise a fourth heat exchange element and a fourth fan configured to supply air to the fourth heat exchange element.

[0017] In an embodiment, each of the second heat exchange element, the third heat exchange element, and the fourth heat exchange element may have a heat exchange channel configured to allow a medium to flow through the heat exchange channel.

[0018] In an embodiment, the dishwasher body may comprise a housing.

[0019] In an embodiment, the housing may comprise an outer shell and a tub disposed in the outer shell.

[0020] In an embodiment, the internal circulation air duct may be formed between the outer shell and the tub.

[0021] In an embodiment, the outer shell may have an exhaust vent, and the second fan may be in communication with the exhaust vent at an air outlet side of the second fan.

[0022] In an embodiment, the housing may further comprise a door body.

[0023] In an embodiment, the outer shell may have a first opening, and the tub may have a second opening at a part of the tub corresponding to the first opening.

[0024] In an embodiment, the door body may be disposed on the outer shell and is configured to expose or cover the first opening and the second opening.

[0025] In an embodiment, when the first opening and the second opening are covered by the door body, the washing chamber may be enclosed by the tub and the door body.

[0026] In an embodiment, the exhaust vent and the first opening may be formed at a same side of the outer shell.

[0027] In an embodiment, the spraying system may comprise a water collection sump, a spraying assembly, and a water pump.

[0028] In an embodiment, the spraying assembly may be disposed in the washing chamber and configured to spray the washing water into the washing chamber.

[0029] In an embodiment, the water collection sump may be in communication with the second heat exchange channel.

[0030] The second heat exchange channel may be in communication with the spraying assembly through a pipeline.

[0031] In an embodiment, the water pump may be disposed on a flow path between the second heat exchange channel and the spraying assembly.

[0032] In an embodiment, the dishwasher may further comprise an auxiliary electric heating device.

[0033] In an embodiment, the auxiliary electric heating device may be disposed on a flow path between the second heat exchange channel of the first heat exchange device and the spraying assembly; and / or the auxiliary electric heating device may be disposed in the internal circulation air duct.

[0034] In an embodiment, the air inlet of the internal circulation air duct may be formed at an upper part of the tub, and the air outlet of the internal circulation air duct may be formed at a lower part of the tub.

[0035] In the present invention, the washing and drying efficiency, flexibility, and an energy utilization rate of the dishwasher can be improved by using independent heat exchange component during each of the washing and drying stages of the dishwasher. This design is effective in saving energy and reducing maintenance costs while providing a better dishwashing experience.BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly explain technical solutions according to the embodiments of the present invention or in the prior art, drawings used in the description of the embodiments or the prior art are briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. Based on the structures shown in these drawings, other drawings can be obtained by those skilled in the art without creative efforts. FIG. 1 is a schematic structural view of an embodiment of a dishwasher provided by the present invention.

[0037] Description of Reference Numerals: 10, dishwasher; 100, dishwasher body; 101, washing chamber; 102, internal circulation air duct; 102a, air inlet; 102b, air outlet; 110, spraying system; 111, water pump; 112, spraying assembly; 113, water collection sump; 200, heat pump system; 210, compression device; 220, switching device; 230, first heat exchange device; 231, first heat exchange element; 232, casing; 240, air heating device; 241, fourth heat exchange element; 242, fourth fan; 250, second heat exchange device; 251, second heat exchange element; 252, second fan; 260, air cooling device; 261, third heat exchange element; 262, third fan; 270, first throttling device; 280, second throttling device; 300, auxiliary electric heating device.

[0038] The implementation, functional characteristics, and advantages of the present invention will be further described in combination with the embodiments and with reference to the accompanying drawings.DETAILED DESCRIPTION

[0039] Technical solutions according to embodiments of the present invention will be clearly and completely described below in combination with accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described below are only a part, rather than all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative labor shall fall within the scope of the present invention.

[0040] It should be noted that, when the embodiments of the present invention relate to directional indication (such as up, down, left, right, front, and back, etc.), the directional indication is only configured to explain a relative position relationship, a motion situation, etc. between components in a certain specific posture. When the specific posture changes, the directional indication also changes accordingly.

[0041] In addition, when the embodiments of the present invention relate to terms such as "first" and "second", the terms such as "first" and "second" are used herein for purposes of description and are not intended to indicate or imply relative importance or significance, or implicitly indicate the number of indicated technical features. Therefore, the feature associated with "first" and "second" may comprise one or more this feature distinctly or implicitly. In addition, when the meaning of "and / or" appearing through the disclosure comprises three parallel solutions, by taking "A and / or B" as an example, the three parallel solutions comprise solution A, or solution B, or solutions A and B satisfied at the same time. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on those of ordinary skill in the art. Further, when the combination of the technical solutions is contradictory or cannot be implemented, it should be regarded that the combination of the technical solutions does not exist, nor is within the scope of the present invention.

[0042] A dishwasher is a device for automatically cleaning tableware such as bowls, chopsticks, plates, dishes, knives, and forks. Commercially available fully-automatic dishwashers on the market may be divided into two types comprising household and commercial dishwashers. Household fully-automatic dishwashers are suitable for families only and are mainly available in cabinet, desk-top, sink-integrated, and integrated types. Commercial dishwashers may be divided into cabinet-type dishwashers, hood-type dishwashers, basket-conveying-type dishwashers, belt-conveying-type dishwashers, and ultrasonic dishwashers according to their structures, which reduces labor strengths of kitchen staff in restaurants, hotels, and canteens of government agencies, and improves operation efficiency and sanitation.

[0043] The present invention provides a dishwasher, aiming to improve washing and drying efficiency of the dishwasher. This dishwasher is a heat pump dishwasher and may be used for household or commercial application. This dishwasher has more obvious advantages when used as a commercial dishwasher. For the convenience of understanding and explanation, in the accompanying drawing of FIG. 1 of the description of the present invention, spaces, grooves, or holes are indicated by solid arrows in the accompanying drawings.

[0044] Referring to FIG. 1, in the embodiment of the present invention, the dishwasher 10 comprises a dishwasher body 100 and a heat pump system 200. The dishwasher body 100 has a washing chamber 101, an internal circulation air duct 102, and a spraying system 110. The internal circulation air duct 102 has an air inlet 102a and an air outlet 102b. Each of the air inlet 102a and the air outlet 102b is in communication with the washing chamber 101. The spraying system 110 is configured to spray washing water into the washing chamber 101 to clean tableware placed in the washing chamber 101. The heat pump system 200 comprises a compression device 210, a switching device 220, a first heat exchange device 230, a second heat exchange device 250, an air cooling device 260, and an air heating device 240. The first heat exchange device 230 has a first heat exchange channel and a second heat exchange channel that are arranged for heat exchange with each other. The compression device 210 forms a first circulation heat exchange loop with the first heat exchange channel and the second heat exchange device 250 through the switching device 220. The compression device 210 forms a second circulation heat exchange loop with the air heating device 240 and the air cooling device 260 through the switching device 220. The second heat exchange channel is in communication with the spraying system 110. The air cooling device 260 and the air heating device 240 are sequentially arranged in the internal circulation air duct 102 in a direction from the air inlet 102a to the air outlet 102b.

[0045] The switching device 220 is configured to: control, during a washing stage, refrigerant discharged from the compression device 210 to pass through the first circulation heat exchange loop; and control, during a drying stage, the refrigerant discharged from the compression device 210 to pass through the second circulation heat exchange loop. That is, the switching device 220 is configured to control the refrigerant discharged from the compression device 210 to pass through the first circulation heat exchange loop, allowing media in the first heat exchange channel and the second heat exchange channel to exchange heat with each other, to produce hot water for the spraying system 110, and the switching device 220 is further configured to control the refrigerant discharged from the compression device 210 to pass through the second circulation heat exchange loop.

[0046] In this way, by using independent heat exchange components in each of the washing and drying stages of the dishwasher 10, the dishwasher 10 can utilize energy more effectively. Each circulation heat exchange loop is dedicated to heat transfer in the washing and drying stages, which improves overall efficiency. In addition, the two relatively independent circulation heat exchange loops provide much flexibility for the dishwasher 10 during the washing and drying processes. An operation state and parameter of each system may be independently controlled as needed to satisfy different washing and drying requirements. Since each system has its own independent heat exchange components, flow of the energy can be controlled more effectively, to reduce energy waste. In this way, it is beneficial to reduce energy consumption of the dishwasher 10 and thus improve an energy utilization rate.

[0047] In the present invention, the washing and drying efficiency, flexibility, and energy utilization rate of the dishwasher 10 can be improved by using the independent heat exchange component in each of the washing and drying stages of the dishwasher 10. This design is effective in saving energy and reducing maintenance costs while providing a better dishwashing experience.

[0048] A specific structure of the dishwasher 10 will be described below in detail.

[0049] Referring to FIG. 1, in the embodiment of the present invention, the dishwasher 10 comprises a dishwasher body 100 and a heat pump system 200.

[0050] The dishwasher body 100 typically comprises a housing and a spraying system 110. A washing chamber 101 and an internal circulation air duct 102 are defined by the housing. The housing typically comprises an outer shell, a tub, and a door body. The outer shell has a first opening, and the tub has a second opening at a part of the tub corresponding to the first opening. The door body is disposed on the outer shell to expose or cover the first opening and the second opening. When the first opening and the second opening are covered by the door body, the washing chamber 101 is enclosed by the tub and the door body, and the internal circulation air duct 102 is formed between the outer shell and the tub. The internal circulation air duct 102 has an air inlet 102a and an air outlet 102b. Each of the air inlet 102a and the air outlet 102b is in communication with the washing chamber 101. In some embodiments, the door body and the tub may be integrated in the dishwasher 10.

[0051] The spraying system 110 is configured to spray the washing water into the washing chamber 101 to clean the tableware placed in the washing chamber 101. The spraying system 110 typically comprises a water pump 111, a spraying assembly 112, water tubes and pipeline system, a controller of the spraying system 110, a filter, a water-level sensor, and a drainage device.

[0052] The water pump 111 is one of the key components of the spraying system 110 of the dishwasher 10, and is dedicated to delivering a cleaning agent and water or a mixture of the cleaning agent and water to a spraying arm or nozzle. The water pump 111 is typically driven by an electric motor to generate sufficient water pressure and flow rate to ensure a washing effect. The spraying assembly 112 is typically the spraying arm or nozzle. The spraying assembly 112 is used as an outlet for spraying the liquid in the spraying system 110 of the dishwasher 10. The water pump 111 and the spraying assembly 112 are typically located inside the dishwasher 10 and spray the cleaning agent and water evenly onto surfaces of bowls, dishes, tableware, and the like through rotation or directional spraying, to achieve thorough cleaning. The water tube and pipeline system is configured to deliver water from the water pump 111 to the spraying arm or nozzle and ensuring that the water flows smoothly to a target region. These tubes are typically made of corrosion-resistant materials, such as stainless steel or plastic. The controller of the spraying system 110 is configured to control start-stop, a spraying time, a spraying mode, and other parameters of the spraying system 110. The controller is typically a part of an electronic control panel of the dishwasher 10. A user may set corresponding parameters through buttons or a touch screen on the panel. The filter is configured to filter impurities and residues in the washing water, preventing the nozzle or pipelines of the spraying system 110 from being blocked, which is effective in maintaining normal operation and a cleaning effect of the spraying system 110. The water-level sensor is configured to monitor an internal water level of the dishwasher 10, to ensure that the water pump 111 operates at a correct water level, thereby avoiding too high or too low water level during the drying stage. The drainage device is configured to discharge sewage generated during the dishwashing process from the dishwasher 10, maintaining a clean environment. The drainage device typically comprises components such as a drainage tube, a drainage pump, and a drainage filter.

[0053] Exemplarily, the spraying system 110 comprises a water pump 111 and a spraying assembly 112. The water pump 111 is disposed on a flow path between the second heat exchange channel of the first heat exchange device 230 and the spraying assembly 112 to deliver washing water in the second heat exchange channel to the spraying assembly 112. The spraying assembly 112 is disposed in the washing chamber 101 to spray the washing water into the washing chamber 101 to clean the tableware placed in the washing chamber 101.

[0054] The heat pump system 200 comprises a compression device 210, a switching device 220, a first heat exchange device 230, a second heat exchange device 250, an air cooling device 260, and an air heating device 240. The first heat exchange device 230 has a first heat exchange channel and a second heat exchange channel that are arranged for heat exchange with each other. The second heat exchange channel is in communication with the spraying system 110. The air cooling device 260 and the air heating device 240 are sequentially arranged in the internal circulation air duct 102 in the direction from the air inlet 102a to the air outlet 102b. The compression device 210 forms the first circulation heat exchange loop with the first heat exchange channel and the second heat exchange device 250 through the switching device 220. The compression device 210 forms the second circulation heat exchange loop with the air heating device 240 and the air cooling device 260 through the switching device 220.

[0055] The compression device 210 is mainly used to compress refrigerant with a low temperature and low pressure into refrigerant with a high temperature and high pressure to achieve a refrigeration cycle. An operation principle of the compression device 210 is that the compression device 210 sucks in the refrigerant from a suction port through its internal reciprocating motion or rotation motion and compresses the refrigerant to be discharged from a discharge port. During this process, a temperature and pressure of the refrigerant increase to achieve a cooling or heating.

[0056] The first heat exchange device 230 has a first heat exchange channel and a second heat exchange channel. The first heat exchange channel is used for carrying refrigerant compressed by the compression device 210, and the second heat exchange channel is in communication with the spraying system 110.

[0057] In this embodiment, the first heat exchange device 230 may be a tube-in-tube heat exchanger, a plate-type heat exchanger, a spiral heat exchanger, a spiral-plate-type heat exchanger, or the like.

[0058] The tube-in-tube heat exchanger comprises a tube bundle (inner tube) and an outer shell. A heat transfer medium (typically a liquid or steam) passes through the tube bundle, transfers heat to another medium (which may be a liquid, gas, or steam, and is the liquid in this embodiment), and flows around the tube bundle inside the outer shell. In this case, the first heat exchange channel may be formed by the inner tube, and the second heat exchange channel may be formed between the inner tube and the outer shell. Alternatively, the second heat exchange channel may be formed by the inner tube, and the first heat exchange channel may be formed between the inner tube and the outer shell. Preferably, the first heat exchange channel may be formed by the inner tube, and the second heat exchange channel may be formed between the inner tube and the outer shell.

[0059] The plate-type heat exchanger is composed of a plurality of plates with gaps between the plurality of plates. The first heat exchange channel and the second heat exchange channel may be defined by these gaps, to allow for heat transfer between the two flowing media. The plate-type heat exchanger has advantages such as a compact design, high-efficiency heat transfer, and easy maintenance and cleaning.

[0060] The spiral-plate-type heat exchanger realizes heat transfer with high efficiency through a plurality of layers of spiral plate-type structure. This heat exchanger combines the advantages of the plate-type heat exchanger and the tube-in-tube heat exchanger.

[0061] The spiral heat exchanger may effectively transfer heat of one medium to the other medium via a spiral-shaped tube structure. The above two media typically refer to refrigerants, air, or water.

[0062] In an exemplary embodiment, the first heat exchange device 230 comprises a casing 232 and a first heat exchange element 231 disposed in the casing 232. The first heat exchange channel is disposed in the first heat exchange element 231, and the second heat exchange channel is disposed in the casing 232. The casing 232 is configured to temporarily store washing water to be heated. In a washing mode, the first heat exchange element 231 is located in the water to heat water in the casing 232. When the spiral-plate-type heat exchanger is selected as the first heat exchange element 231, the heating efficiency is relatively high. The spiral-plate-type heat exchanger is similar to the plate-type heat exchanger. A design of the spiral-plate-type heat exchanger allows the spiral-plate-type heat exchanger to carry out heat exchange in water. The spiral-plate-type heat exchanger is selected to allow for relatively high heat exchange efficiency and a smaller volume in this embodiment.

[0063] In this embodiment, the second heat exchange device 250 is typically used for heat exchange with air, usually by absorbing heat from the air. The second heat exchange device 250 typically consists of cooling fins, a fan, and a heat-dissipation tube, and cools air through forced convection. For example, the second heat exchange device 250 comprises a second heat exchange element 251 and a second fan 252. The second fan 252 is configured to supply air to the second heat exchange element 251, and the second heat exchange element 251 has a heat exchange channel configured to allow a medium to flow through the heat exchange channel. In other embodiments, heat exchange may also be achieved through cooperation of the spiral-plate-type heat exchanger with the casing 232 or other heat exchangers.

[0064] The air cooling device 260 and the air heating device 240 are sequentially arranged in the internal circulation air duct 102 in the direction from the air inlet 102a to the air outlet 102b. In this way, during a drying mode or the drying stage, air with a high temperature and high humidity in the dishwasher 10 enters the internal circulation air duct 102 from the air inlet 102a, then is cooled and dehumidified by passing through the air cooling device 260, then is heated by passing through the air heating device 240, and is finally blown into the washing chamber 101 from the air outlet 102b, to heat and dry the tableware in the washing chamber 101.

[0065] The air cooling device 260 is mainly configured to transfer heat in a hot medium (such as water and engine oil) to the surrounding air to achieve cooling. This type of heat exchanger typically comprises cooling fins or a heat-dissipation tubes. The heat is taken away from a hot medium through a fan or natural convection, and is released into the surrounding air. In this embodiment, the air cooling device 260 may also be an air-spiral heat exchanger. The air-spiral heat exchanger combines the design of a spiral heat exchanger and the function of an air heat exchanger, and exchanges heat with air through the spiral-shaped tube structure.

[0066] In this embodiment, a structure of the air heating device 240 is the same as a structure of the air cooling device 260. The main difference between the air heating device 240 and the air cooling device 260 lies in their installation positions, which realizes the difference between cooling and heating, and details thereof are omitted herein.

[0067] In an exemplary embodiment, the second heat exchange device 250 comprises a second heat exchange element 251 and a second fan 252, and the second fan 252 is configured to supply air to the second heat exchange element 251. The air cooling device 260 comprises a third heat exchange element 261 and a third fan 262, and the third fan 262 is configured to supply air to the third heat exchange element 261. The air heating device 240 comprises a fourth heat exchange element 241 and a fourth fan 242, and the fourth fan 242 is configured to supply air to the fourth heat exchange element 241. Each of the second heat exchange element 251, the third heat exchange element 261, and the fourth heat exchange element 241 has a heat exchange channel configured to allow the medium to flow through the heat exchange channel. By providing the second fan 252, the third fan 262, and the fourth fan 242, heat exchange efficiency of the second heat exchange device 250, the air cooling device 260, and the air heating device 240 may be enhanced.

[0068] In an embodiment, the second heat exchange device 250 comprises a second heat exchange element 251 and a second fan 252. The second fan 252 is configured to supply air to the second heat exchange element 251. That is, the second heat exchange device 250 is a fin-type heat exchanger that has relatively high heat exchange efficiency in a scenario of heat exchange with the air. In other embodiments, the second heat exchange device 250 may also be other heat exchangers.

[0069] In another embodiment, the air cooling device 260 comprises a third heat exchange element 261 and a third fan 262, and the third fan 262 is configured to supply air to the third heat exchange element 261. That is, the air cooling device 260 is a fin-type heat exchanger that has relatively high heat exchange efficiency in a scenario of heat exchange with the air. In other embodiments, the air cooling device 260 may also be other heat exchangers.

[0070] In yet another embodiment, the air heating device 240 comprises a fourth heat exchange element 241 and a fourth fan 242, and the fourth fan 242 is configured to supply air to the fourth heat exchange element 241. That is, the air heating device 240 is a fin-type heat exchanger that has relatively high heat exchange efficiency in a scenario of heat exchange with the air. In other embodiments, the air heating device 240 may also be other heat exchangers.

[0071] Each of the second heat exchange element 251, the third heat exchange element 261, and the fourth heat exchange element 241 described above has a heat exchange channel configured to allow the medium to flow through the heat exchange channel.

[0072] The dishwasher comprises a control component. The control component is configured to control operation of the second fan 252 during the washing stage and control operation of the third fan 262 and / or the fourth fan 242 during the drying stage. Controlling the operation of the second fan 252, the third fan 262, and the fourth fan 242 comprises controlling their startup, startup durations, and rotation speeds.

[0073] In a preferred embodiment, only one of the third fan 262 and the fourth fan 242 may be selected for use.

[0074] The switching device 220 is configured to: control, during the washing stage, the refrigerant discharged from the compression device 210 to pass through the first circulation heat exchange loop; and control, during the drying stage, the refrigerant discharged from the compression device 210 to pass through the second circulation heat exchange loop. That is, the switching device 220 is configured to control the refrigerant discharged from the compression device 210 to pass through the first circulation heat exchange loop, enabling the media in the first heat exchange channel and the second heat exchange channel to exchange heat with each other to produce hot water for the spraying system 110, and the switching device 220 is further configured to control the refrigerant discharged from the compression device 210 to pass through the second circulation heat exchange loop.

[0075] The switching device 220 may be a multi-way valve such as a three-way valve, or may be composed of a plurality of stop valves or common on-off valves. A control pipeline composed of a plurality of stop valves or on-off valves has the advantage of low noise. A control pipeline provided with the three-way valve has the advantage of occupying a small internal space of the dishwasher 10.

[0076] Exemplarily, the switching device 220 is a three-way valve. The three-way valve is a common valve configured to control a flow direction of a fluid between two inlets and one outlet or to distribute the fluid flow.

[0077] A general structure of the three-way valve comprises a valve body, a valve core, and a seal. These members cooperate with each other to enable the three-way valve to control the flow direction of the fluid or distribute the fluid flow. The valve body is a main component of the three-way valve, and typically has a structure made of metal or alloy similar to a tube connection. The valve body has two inlets and one outlet, and forms a "Y"-shaped or "T"-shaped structure. The valve core is a key component for controlling flow of the fluid. The valve core is typically located inside the body 100, and is movable to switch channels between the inlets and the outlet. A movement of the valve core may be controlled through manual operation or by an electric, pneumatic, or hydraulic actuator. The seal is configured to ensure sealing performance of the valve when the valve is closed, thereby avoiding a fluid leakage. The three-way valve typically has a plurality of connection manners such as welding, threading, or flanging, to be facilitated to be installed in a pipeline system. In addition, some three-way valves are equipped with actuators and used for automatically controlling the movement of the valve core to achieve remote or automated control. The actuators may be manual, electric, pneumatic, or hydraulic.

[0078] In some embodiments, the valve body comprises a first port, a second port, and a third port. In an embodiment, the first port is configured to be in communication with a discharge port of the compression device. The second port is configured to be in communication with the first heat exchange channel of the first heat exchange device 230. The third port is configured to be in communication with the air heating device 240. During the washing stage, the first port is in communication with the second port and isolated from the third port, and during the drying stage, the first port is in communication with the third port and isolated from the second port. That is, the first port, the second port, and the third port have a first communication state and a second communication state. In the first communication state, the first port is in communication with the second port and isolated from the third port, and in the second communication state, the first port is in communication with the third port and isolated from the second port.

[0079] It can be understood that the dishwasher 10 typically also comprises a tableware rack, a water collection sump, or some other auxiliary components such as thermal insulation boxes, a tableware support, and a filtration mesh, to ensure normal operation and convenient maintenance of the dishwasher 10, and details thereof are omitted herein.

[0080] During actual operation, the heat pump system 200 comprises a throttling device. The throttling device mainly comprises the following functions.

[0081] The throttling device can adjust a refrigerant flow rate. Specifically, the throttling device may throttle and depressurize a high-pressure liquid of the air heating device 240 into a low-pressure liquid, while simultaneously adjusting a flow rate of refrigerant entering an evaporator. In this way, it is ensured that the refrigerant flow rate in the heat pump system 200 is within a reasonable range.

[0082] Further, the throttling device can reduce heat exchange difficulty. For example, during the heat exchange, the throttling device allows refrigerant liquid to flow through a small hole, to form a local contraction, which increases a flow velocity and reduces a static pressure. This pressure difference enables the refrigerant to evaporate more easily in the evaporator, reducing the heat exchange difficulty and improving the heat exchange efficiency.

[0083] Furthermore, the throttling device can realize temperature control. The throttling device may also be an important part of temperature control. When the system needs a lower temperature, the refrigerant flow rate may be reduced by means of the throttling device, lowering an evaporation temperature. On the contrary, when the system needs a higher temperature, the refrigerant flow rate may be increased by means of the throttling device, increasing the evaporation temperature.

[0084] In an embodiment, in order to facilitate the temperature control during the washing stage and reduce the heat exchange difficulty during the washing stage, the heat pump system 200 comprises a first throttling device 270. The first throttling device 270 is disposed on a flow path between the first heat exchange device 230 and the second heat exchange device 250. Preferably, the first throttling device 270 is disposed on a flow path between the air cooling device 260 and the second heat exchange device 250.

[0085] In another embodiment, in order to facilitate the temperature control during the drying stage and reduce the heat exchange difficulty during the washing stage, the heat pump system 200 comprises a second throttling device 280. The second throttling device 280 is disposed on a flow path between the air heating device 240 and the air cooling device 260.

[0086] In an embodiment, the dishwasher body 100 comprises a housing. The housing comprises an outer shell, a door body assembly, a tub with a side having an opening, and a water collection sump disposed below the tub. The door body is rotatably disposed on the outer shell to expose or cover the opening. When the opening is covered by the door body, the washing chamber 101 is enclosed by the tub, the water collection sump, and the door body, and the internal circulation air duct 102 is formed between the outer shell and the tub.

[0087] Based on the previous embodiment, in order to improve the heat exchange efficiency of the second heat exchange device 250, the second heat exchange device 250 comprises a second heat exchange element 251 and a second fan 252. The second fan 252 is configured to supply air to the second heat exchange element 251.

[0088] In order to further improve the heat exchange efficiency of the second heat exchange device 250, the outer shell has an exhaust vent, and the second fan 252 is in communication with the exhaust vent at an air outlet side of the second fan 252. In this way, through the arrangement of the exhaust vent, the second heat exchange device 250 is allowed to exchange heat with the air outside the dishwasher 10, which improves the heat exchange efficiency of the second heat exchange device 250.

[0089] In addition, to make air exhaust smoother, the exhaust vent and the first opening are formed at one side of the outer shell, i.e., the exhaust vent is formed at a front side (a side facing towards the user). In this way, when the dishwasher 10 is placed against a wall, the exhaust vent is prevented from being blocked, or an air flow is prevented from being intercepted, making the air exhaust smoother.

[0090] In other embodiments, the second heat exchange device 250 may also be disposed outside the housing of the dishwasher 10.

[0091] In some embodiments, the air inlet 102a of the internal circulation air duct 102 is formed at an upper part of the tub, and the air outlet 102b of the internal circulation air duct 102 is formed at a lower part of the tub. With a midline of a height of the tub as a reference, a part above the midline is defined as the upper part, and a part below the midline is defined as the lower part. The air inlet 102a and the air outlet 102b of the internal circulation air duct 102 may be formed at one side surface of the tub.

[0092] By taking the tub in a predetermined direction as an example, the air inlet 102a and the air outlet 102b of the internal circulation air duct 102 may be formed at a left side surface, a right side surface, or a rear side surface of the tub. In this case, the air cooling device 260 and the air heating device 240 may also be disposed at one side surface of the tub, i.e., at a left side surface, a right side surface, or a rear side surface of the tub.

[0093] In another embodiment, the air cooling device 260 and the air heating device 240 are disposed below the tub.

[0094] In an embodiment, the dishwasher 10 further comprises an auxiliary electric heating device 300. In this embodiment, the auxiliary electric heating device 300 is an auxiliary heating device that uses electric energy as an energy source, converts the electric energy into heat energy, and provides additional heat when the main heat pump system 200 is unable to satisfy the requirements or when additional heating is required.

[0095] The auxiliary electric heating device 300 is disposed on the flow path between the second heat exchange channel of the first heat exchange device 230 and the spraying assembly 112. In this way, when the heat pump system 200 is unable to satisfy the requirements during the washing stage, this auxiliary electric heating device 300 may be started. Then, the auxiliary electric heating device 300 may also be disposed in the internal circulation air duct 102. In this way, when the heat pump system 200 is unable to satisfy the requirements during the drying stage, this auxiliary electric heating device 300 may also be started. It can be understood that the auxiliary electric heating device 300 may be disposed on each of flow paths between the internal circulation air duct 102, the casing 232, and the spraying assembly 112, or one auxiliary electric heating device 300 may carry out heating operation during both the washing stage and the drying stage.

[0096] Exemplarily, the auxiliary electric heating device 300 typically comprises an electric heating element, a control element, and a protection element.

[0097] The heating element is typically an electric heating wire, an electric heating tube, or an electric heating plate, which is a key component for converting the electric energy into the heat energy. The control element is configured to control heating power and an operation state of the electric heating element, and typically comprises a temperature sensor and a temperature controller. The temperature controller is typically integrated with other control elements into a control device. The protection element is configured to ensure safe operation of the electric heating device 300, preventing overheating or circuit failures, and typically comprises an overheat protector and a leakage protector.

[0098] When the heating system needs additional heating, the control device receives a signal and activates the electric heating element to perform heating. The electric heating element generates the heat energy under the action of an electric current and transfers the heat energy to a surrounding fluid (that is usually water or air). The temperature sensor monitors a fluid temperature and feeds back information to the control device. The control element adjusts heating power of the electric heating element based on the feedback information of the temperature sensor, to keep the fluid temperature within a predetermined range. When the temperature is too high or a failure occurs, the protection element automatically cuts off the power supply to ensure safe operation.

[0099] The embodiments as described above are merely exemplary implementations of the present invention, and are not therefore intended to limit the scope of the present invention. Any equivalent structural modification made based on the specification and the accompanying drawings of the present invention, or directly / indirectly application to other related art, are all comprised within the scope of the present invention under the technical concept of the present invention.

Examples

Embodiment Construction

[0039]Technical solutions according to embodiments of the present invention will be clearly and completely described below in combination with accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described below are only a part, rather than all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative labor shall fall within the scope of the present invention.

[0040]It should be noted that, when the embodiments of the present invention relate to directional indication (such as up, down, left, right, front, and back, etc.), the directional indication is only configured to explain a relative position relationship, a motion situation, etc. between components in a certain specific posture. When the specific posture changes, the directional indication also changes accordingly.

[0041]In addition, when the embodiments of the pre...

FIELD

[0001] The present invention relates to the technical field of dishwashers, and in particular, to a dishwasher.BACKGROUND

[0002] A heat pump dishwasher typically has two modes or stages comprising washing and drying. After washing is completed, an interior of the dishwasher is filled with humid air with high relative humidity and a high temperature and liquid water droplets adhering to a surface of tableware. Therefore, activation of the drying mode is required. However, in the related art, the heat pump dishwasher suffers from low efficiency in both washing and drying processes.SUMMARY

[0003] A main objective of the present invention is to provide a dishwasher, aiming to improve washing and drying efficiency of the dishwasher.

[0004] To achieve the above-mentioned objective, the dishwasher according to embodiments of the present invention comprises a dishwasher body and a heat pump system. The dishwasher body has a washing chamber, an internal circulation air duct, and a spraying system. The internal circulation air duct has an air inlet and an air outlet, and each of the air inlet and the air outlet is in communication with the washing chamber. The spraying system is configured to spray washing water into the washing chamber to clean tableware placed in the washing chamber. The heat pump system comprises a compression device, a switching device, a first heat exchange device, a second heat exchange device, an air cooling device, and an air heating device. The first heat exchange device has a first heat exchange channel and a second heat exchange channel that are arranged for heat exchange with each other. The compression device forms a first circulation heat exchange loop with the first heat exchange channel and the second heat exchange device through the switching device, and the compression device forms a second circulation heat exchange loop with the air heating device and the air cooling device through the switching device. The second heat exchange channel is in communication with the spraying system. The air cooling device and the air heating device are sequentially arranged in the internal circulation air duct in a direction from the air inlet to the air outlet. The switching device is configured to: control, during a washing stage, refrigerant discharged from the compression device to pass through the first circulation heat exchange loop; and control, during a drying stage, the refrigerant discharged from the compression device to pass through the second circulation heat exchange loop.

[0005] In an embodiment, the first heat exchange device may comprise a casing and a first heat exchange element disposed in the casing.

[0006] In an embodiment, the first heat exchange channel may be defined by the first heat exchange element.

[0007] In an embodiment, the second heat exchange channel may be formed between the casing and the first heat exchange element.

[0008] In an embodiment, the switching device comprises a first port, a second port, and a third port.

[0009] In an embodiment, the first port is configured to be in communication with a discharge port of the compression device.

[0010] In an embodiment, the second port is configured to be in communication with the first heat exchange channel of the first heat exchange device.

[0011] In an embodiment, the third port is configured to be in communication with the air heating device.

[0012] In an embodiment, during the washing stage, the first port may be in communication with the second port and isolated from the third port, and during the drying stage, the first port may be in communication with the third port and isolated from the second port.

[0013] In an embodiment, the heat pump system may comprise a first throttling device disposed on a flow path between the first heat exchange device and the second heat exchange device; and / or the heat pump system may comprise a second throttling device disposed on a flow path between the air heating device and the air cooling device.

[0014] In an embodiment, the second heat exchange device may comprise a second heat exchange element and a second fan configured to supply air to the second heat exchange element.

[0015] In an embodiment, the air cooling device may comprise a third heat exchange element and a third fan configured to supply air to the third heat exchange element.

[0016] In an embodiment, the air heating device may comprise a fourth heat exchange element and a fourth fan configured to supply air to the fourth heat exchange element.

[0017] In an embodiment, each of the second heat exchange element, the third heat exchange element, and the fourth heat exchange element may have a heat exchange channel configured to allow a medium to flow through the heat exchange channel.

[0018] In an embodiment, the dishwasher body may comprise a housing.

[0019] In an embodiment, the housing may comprise an outer shell and a tub disposed in the outer shell.

[0020] In an embodiment, the internal circulation air duct may be formed between the outer shell and the tub.

[0021] In an embodiment, the outer shell may have an exhaust vent, and the second fan may be in communication with the exhaust vent at an air outlet side of the second fan.

[0022] In an embodiment, the housing may further comprise a door body.

[0023] In an embodiment, the outer shell may have a first opening, and the tub may have a second opening at a part of the tub corresponding to the first opening.

[0024] In an embodiment, the door body may be disposed on the outer shell and is configured to expose or cover the first opening and the second opening.

[0025] In an embodiment, when the first opening and the second opening are covered by the door body, the washing chamber may be enclosed by the tub and the door body.

[0026] In an embodiment, the exhaust vent and the first opening may be formed at a same side of the outer shell.

[0027] In an embodiment, the spraying system may comprise a water collection sump, a spraying assembly, and a water pump.

[0028] In an embodiment, the spraying assembly may be disposed in the washing chamber and configured to spray the washing water into the washing chamber.

[0029] In an embodiment, the water collection sump may be in communication with the second heat exchange channel.

[0030] The second heat exchange channel may be in communication with the spraying assembly through a pipeline.

[0031] In an embodiment, the water pump may be disposed on a flow path between the second heat exchange channel and the spraying assembly.

[0032] In an embodiment, the dishwasher may further comprise an auxiliary electric heating device.

[0033] In an embodiment, the auxiliary electric heating device may be disposed on a flow path between the second heat exchange channel of the first heat exchange device and the spraying assembly; and / or the auxiliary electric heating device may be disposed in the internal circulation air duct.

[0034] In an embodiment, the air inlet of the internal circulation air duct may be formed at an upper part of the tub, and the air outlet of the internal circulation air duct may be formed at a lower part of the tub.

[0035] In the present invention, the washing and drying efficiency, flexibility, and an energy utilization rate of the dishwasher can be improved by using independent heat exchange component during each of the washing and drying stages of the dishwasher. This design is effective in saving energy and reducing maintenance costs while providing a better dishwashing experience.BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly explain technical solutions according to the embodiments of the present invention or in the prior art, drawings used in the description of the embodiments or the prior art are briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. Based on the structures shown in these drawings, other drawings can be obtained by those skilled in the art without creative efforts. FIG. 1 is a schematic structural view of an embodiment of a dishwasher provided by the present invention.

[0037] Description of Reference Numerals: 10, dishwasher; 100, dishwasher body; 101, washing chamber; 102, internal circulation air duct; 102a, air inlet; 102b, air outlet; 110, spraying system; 111, water pump; 112, spraying assembly; 113, water collection sump; 200, heat pump system; 210, compression device; 220, switching device; 230, first heat exchange device; 231, first heat exchange element; 232, casing; 240, air heating device; 241, fourth heat exchange element; 242, fourth fan; 250, second heat exchange device; 251, second heat exchange element; 252, second fan; 260, air cooling device; 261, third heat exchange element; 262, third fan; 270, first throttling device; 280, second throttling device; 300, auxiliary electric heating device.

[0038] The implementation, functional characteristics, and advantages of the present invention will be further described in combination with the embodiments and with reference to the accompanying drawings.DETAILED DESCRIPTION

[0039] Technical solutions according to embodiments of the present invention will be clearly and completely described below in combination with accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described below are only a part, rather than all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative labor shall fall within the scope of the present invention.

[0040] It should be noted that, when the embodiments of the present invention relate to directional indication (such as up, down, left, right, front, and back, etc.), the directional indication is only configured to explain a relative position relationship, a motion situation, etc. between components in a certain specific posture. When the specific posture changes, the directional indication also changes accordingly.

[0041] In addition, when the embodiments of the present invention relate to terms such as "first" and "second", the terms such as "first" and "second" are used herein for purposes of description and are not intended to indicate or imply relative importance or significance, or implicitly indicate the number of indicated technical features. Therefore, the feature associated with "first" and "second" may comprise one or more this feature distinctly or implicitly. In addition, when the meaning of "and / or" appearing through the disclosure comprises three parallel solutions, by taking "A and / or B" as an example, the three parallel solutions comprise solution A, or solution B, or solutions A and B satisfied at the same time. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on those of ordinary skill in the art. Further, when the combination of the technical solutions is contradictory or cannot be implemented, it should be regarded that the combination of the technical solutions does not exist, nor is within the scope of the present invention.

[0042] A dishwasher is a device for automatically cleaning tableware such as bowls, chopsticks, plates, dishes, knives, and forks. Commercially available fully-automatic dishwashers on the market may be divided into two types comprising household and commercial dishwashers. Household fully-automatic dishwashers are suitable for families only and are mainly available in cabinet, desk-top, sink-integrated, and integrated types. Commercial dishwashers may be divided into cabinet-type dishwashers, hood-type dishwashers, basket-conveying-type dishwashers, belt-conveying-type dishwashers, and ultrasonic dishwashers according to their structures, which reduces labor strengths of kitchen staff in restaurants, hotels, and canteens of government agencies, and improves operation efficiency and sanitation.

[0043] The present invention provides a dishwasher, aiming to improve washing and drying efficiency of the dishwasher. This dishwasher is a heat pump dishwasher and may be used for household or commercial application. This dishwasher has more obvious advantages when used as a commercial dishwasher. For the convenience of understanding and explanation, in the accompanying drawing of FIG. 1 of the description of the present invention, spaces, grooves, or holes are indicated by solid arrows in the accompanying drawings.

[0044] Referring to FIG. 1, in the embodiment of the present invention, the dishwasher 10 comprises a dishwasher body 100 and a heat pump system 200. The dishwasher body 100 has a washing chamber 101, an internal circulation air duct 102, and a spraying system 110. The internal circulation air duct 102 has an air inlet 102a and an air outlet 102b. Each of the air inlet 102a and the air outlet 102b is in communication with the washing chamber 101. The spraying system 110 is configured to spray washing water into the washing chamber 101 to clean tableware placed in the washing chamber 101. The heat pump system 200 comprises a compression device 210, a switching device 220, a first heat exchange device 230, a second heat exchange device 250, an air cooling device 260, and an air heating device 240. The first heat exchange device 230 has a first heat exchange channel and a second heat exchange channel that are arranged for heat exchange with each other. The compression device 210 forms a first circulation heat exchange loop with the first heat exchange channel and the second heat exchange device 250 through the switching device 220. The compression device 210 forms a second circulation heat exchange loop with the air heating device 240 and the air cooling device 260 through the switching device 220. The second heat exchange channel is in communication with the spraying system 110. The air cooling device 260 and the air heating device 240 are sequentially arranged in the internal circulation air duct 102 in a direction from the air inlet 102a to the air outlet 102b.

[0045] The switching device 220 is configured to: control, during a washing stage, refrigerant discharged from the compression device 210 to pass through the first circulation heat exchange loop; and control, during a drying stage, the refrigerant discharged from the compression device 210 to pass through the second circulation heat exchange loop. That is, the switching device 220 is configured to control the refrigerant discharged from the compression device 210 to pass through the first circulation heat exchange loop, allowing media in the first heat exchange channel and the second heat exchange channel to exchange heat with each other, to produce hot water for the spraying system 110, and the switching device 220 is further configured to control the refrigerant discharged from the compression device 210 to pass through the second circulation heat exchange loop.

[0046] In this way, by using independent heat exchange components in each of the washing and drying stages of the dishwasher 10, the dishwasher 10 can utilize energy more effectively. Each circulation heat exchange loop is dedicated to heat transfer in the washing and drying stages, which improves overall efficiency. In addition, the two relatively independent circulation heat exchange loops provide much flexibility for the dishwasher 10 during the washing and drying processes. An operation state and parameter of each system may be independently controlled as needed to satisfy different washing and drying requirements. Since each system has its own independent heat exchange components, flow of the energy can be controlled more effectively, to reduce energy waste. In this way, it is beneficial to reduce energy consumption of the dishwasher 10 and thus improve an energy utilization rate.

[0047] In the present invention, the washing and drying efficiency, flexibility, and energy utilization rate of the dishwasher 10 can be improved by using the independent heat exchange component in each of the washing and drying stages of the dishwasher 10. This design is effective in saving energy and reducing maintenance costs while providing a better dishwashing experience.

[0048] A specific structure of the dishwasher 10 will be described below in detail.

[0049] Referring to FIG. 1, in the embodiment of the present invention, the dishwasher 10 comprises a dishwasher body 100 and a heat pump system 200.

[0050] The dishwasher body 100 typically comprises a housing and a spraying system 110. A washing chamber 101 and an internal circulation air duct 102 are defined by the housing. The housing typically comprises an outer shell, a tub, and a door body. The outer shell has a first opening, and the tub has a second opening at a part of the tub corresponding to the first opening. The door body is disposed on the outer shell to expose or cover the first opening and the second opening. When the first opening and the second opening are covered by the door body, the washing chamber 101 is enclosed by the tub and the door body, and the internal circulation air duct 102 is formed between the outer shell and the tub. The internal circulation air duct 102 has an air inlet 102a and an air outlet 102b. Each of the air inlet 102a and the air outlet 102b is in communication with the washing chamber 101. In some embodiments, the door body and the tub may be integrated in the dishwasher 10.

[0051] The spraying system 110 is configured to spray the washing water into the washing chamber 101 to clean the tableware placed in the washing chamber 101. The spraying system 110 typically comprises a water pump 111, a spraying assembly 112, water tubes and pipeline system, a controller of the spraying system 110, a filter, a water-level sensor, and a drainage device.

[0052] The water pump 111 is one of the key components of the spraying system 110 of the dishwasher 10, and is dedicated to delivering a cleaning agent and water or a mixture of the cleaning agent and water to a spraying arm or nozzle. The water pump 111 is typically driven by an electric motor to generate sufficient water pressure and flow rate to ensure a washing effect. The spraying assembly 112 is typically the spraying arm or nozzle. The spraying assembly 112 is used as an outlet for spraying the liquid in the spraying system 110 of the dishwasher 10. The water pump 111 and the spraying assembly 112 are typically located inside the dishwasher 10 and spray the cleaning agent and water evenly onto surfaces of bowls, dishes, tableware, and the like through rotation or directional spraying, to achieve thorough cleaning. The water tube and pipeline system is configured to deliver water from the water pump 111 to the spraying arm or nozzle and ensuring that the water flows smoothly to a target region. These tubes are typically made of corrosion-resistant materials, such as stainless steel or plastic. The controller of the spraying system 110 is configured to control start-stop, a spraying time, a spraying mode, and other parameters of the spraying system 110. The controller is typically a part of an electronic control panel of the dishwasher 10. A user may set corresponding parameters through buttons or a touch screen on the panel. The filter is configured to filter impurities and residues in the washing water, preventing the nozzle or pipelines of the spraying system 110 from being blocked, which is effective in maintaining normal operation and a cleaning effect of the spraying system 110. The water-level sensor is configured to monitor an internal water level of the dishwasher 10, to ensure that the water pump 111 operates at a correct water level, thereby avoiding too high or too low water level during the drying stage. The drainage device is configured to discharge sewage generated during the dishwashing process from the dishwasher 10, maintaining a clean environment. The drainage device typically comprises components such as a drainage tube, a drainage pump, and a drainage filter.

[0053] Exemplarily, the spraying system 110 comprises a water pump 111 and a spraying assembly 112. The water pump 111 is disposed on a flow path between the second heat exchange channel of the first heat exchange device 230 and the spraying assembly 112 to deliver washing water in the second heat exchange channel to the spraying assembly 112. The spraying assembly 112 is disposed in the washing chamber 101 to spray the washing water into the washing chamber 101 to clean the tableware placed in the washing chamber 101.

[0054] The heat pump system 200 comprises a compression device 210, a switching device 220, a first heat exchange device 230, a second heat exchange device 250, an air cooling device 260, and an air heating device 240. The first heat exchange device 230 has a first heat exchange channel and a second heat exchange channel that are arranged for heat exchange with each other. The second heat exchange channel is in communication with the spraying system 110. The air cooling device 260 and the air heating device 240 are sequentially arranged in the internal circulation air duct 102 in the direction from the air inlet 102a to the air outlet 102b. The compression device 210 forms the first circulation heat exchange loop with the first heat exchange channel and the second heat exchange device 250 through the switching device 220. The compression device 210 forms the second circulation heat exchange loop with the air heating device 240 and the air cooling device 260 through the switching device 220.

[0055] The compression device 210 is mainly used to compress refrigerant with a low temperature and low pressure into refrigerant with a high temperature and high pressure to achieve a refrigeration cycle. An operation principle of the compression device 210 is that the compression device 210 sucks in the refrigerant from a suction port through its internal reciprocating motion or rotation motion and compresses the refrigerant to be discharged from a discharge port. During this process, a temperature and pressure of the refrigerant increase to achieve a cooling or heating.

[0056] The first heat exchange device 230 has a first heat exchange channel and a second heat exchange channel. The first heat exchange channel is used for carrying refrigerant compressed by the compression device 210, and the second heat exchange channel is in communication with the spraying system 110.

[0057] In this embodiment, the first heat exchange device 230 may be a tube-in-tube heat exchanger, a plate-type heat exchanger, a spiral heat exchanger, a spiral-plate-type heat exchanger, or the like.

[0058] The tube-in-tube heat exchanger comprises a tube bundle (inner tube) and an outer shell. A heat transfer medium (typically a liquid or steam) passes through the tube bundle, transfers heat to another medium (which may be a liquid, gas, or steam, and is the liquid in this embodiment), and flows around the tube bundle inside the outer shell. In this case, the first heat exchange channel may be formed by the inner tube, and the second heat exchange channel may be formed between the inner tube and the outer shell. Alternatively, the second heat exchange channel may be formed by the inner tube, and the first heat exchange channel may be formed between the inner tube and the outer shell. Preferably, the first heat exchange channel may be formed by the inner tube, and the second heat exchange channel may be formed between the inner tube and the outer shell.

[0059] The plate-type heat exchanger is composed of a plurality of plates with gaps between the plurality of plates. The first heat exchange channel and the second heat exchange channel may be defined by these gaps, to allow for heat transfer between the two flowing media. The plate-type heat exchanger has advantages such as a compact design, high-efficiency heat transfer, and easy maintenance and cleaning.

[0060] The spiral-plate-type heat exchanger realizes heat transfer with high efficiency through a plurality of layers of spiral plate-type structure. This heat exchanger combines the advantages of the plate-type heat exchanger and the tube-in-tube heat exchanger.

[0061] The spiral heat exchanger may effectively transfer heat of one medium to the other medium via a spiral-shaped tube structure. The above two media typically refer to refrigerants, air, or water.

[0062] In an exemplary embodiment, the first heat exchange device 230 comprises a casing 232 and a first heat exchange element 231 disposed in the casing 232. The first heat exchange channel is disposed in the first heat exchange element 231, and the second heat exchange channel is disposed in the casing 232. The casing 232 is configured to temporarily store washing water to be heated. In a washing mode, the first heat exchange element 231 is located in the water to heat water in the casing 232. When the spiral-plate-type heat exchanger is selected as the first heat exchange element 231, the heating efficiency is relatively high. The spiral-plate-type heat exchanger is similar to the plate-type heat exchanger. A design of the spiral-plate-type heat exchanger allows the spiral-plate-type heat exchanger to carry out heat exchange in water. The spiral-plate-type heat exchanger is selected to allow for relatively high heat exchange efficiency and a smaller volume in this embodiment.

[0063] In this embodiment, the second heat exchange device 250 is typically used for heat exchange with air, usually by absorbing heat from the air. The second heat exchange device 250 typically consists of cooling fins, a fan, and a heat-dissipation tube, and cools air through forced convection. For example, the second heat exchange device 250 comprises a second heat exchange element 251 and a second fan 252. The second fan 252 is configured to supply air to the second heat exchange element 251, and the second heat exchange element 251 has a heat exchange channel configured to allow a medium to flow through the heat exchange channel. In other embodiments, heat exchange may also be achieved through cooperation of the spiral-plate-type heat exchanger with the casing 232 or other heat exchangers.

[0064] The air cooling device 260 and the air heating device 240 are sequentially arranged in the internal circulation air duct 102 in the direction from the air inlet 102a to the air outlet 102b. In this way, during a drying mode or the drying stage, air with a high temperature and high humidity in the dishwasher 10 enters the internal circulation air duct 102 from the air inlet 102a, then is cooled and dehumidified by passing through the air cooling device 260, then is heated by passing through the air heating device 240, and is finally blown into the washing chamber 101 from the air outlet 102b, to heat and dry the tableware in the washing chamber 101.

[0065] The air cooling device 260 is mainly configured to transfer heat in a hot medium (such as water and engine oil) to the surrounding air to achieve cooling. This type of heat exchanger typically comprises cooling fins or a heat-dissipation tubes. The heat is taken away from a hot medium through a fan or natural convection, and is released into the surrounding air. In this embodiment, the air cooling device 260 may also be an air-spiral heat exchanger. The air-spiral heat exchanger combines the design of a spiral heat exchanger and the function of an air heat exchanger, and exchanges heat with air through the spiral-shaped tube structure.

[0066] In this embodiment, a structure of the air heating device 240 is the same as a structure of the air cooling device 260. The main difference between the air heating device 240 and the air cooling device 260 lies in their installation positions, which realizes the difference between cooling and heating, and details thereof are omitted herein.

[0067] In an exemplary embodiment, the second heat exchange device 250 comprises a second heat exchange element 251 and a second fan 252, and the second fan 252 is configured to supply air to the second heat exchange element 251. The air cooling device 260 comprises a third heat exchange element 261 and a third fan 262, and the third fan 262 is configured to supply air to the third heat exchange element 261. The air heating device 240 comprises a fourth heat exchange element 241 and a fourth fan 242, and the fourth fan 242 is configured to supply air to the fourth heat exchange element 241. Each of the second heat exchange element 251, the third heat exchange element 261, and the fourth heat exchange element 241 has a heat exchange channel configured to allow the medium to flow through the heat exchange channel. By providing the second fan 252, the third fan 262, and the fourth fan 242, heat exchange efficiency of the second heat exchange device 250, the air cooling device 260, and the air heating device 240 may be enhanced.

[0068] In an embodiment, the second heat exchange device 250 comprises a second heat exchange element 251 and a second fan 252. The second fan 252 is configured to supply air to the second heat exchange element 251. That is, the second heat exchange device 250 is a fin-type heat exchanger that has relatively high heat exchange efficiency in a scenario of heat exchange with the air. In other embodiments, the second heat exchange device 250 may also be other heat exchangers.

[0069] In another embodiment, the air cooling device 260 comprises a third heat exchange element 261 and a third fan 262, and the third fan 262 is configured to supply air to the third heat exchange element 261. That is, the air cooling device 260 is a fin-type heat exchanger that has relatively high heat exchange efficiency in a scenario of heat exchange with the air. In other embodiments, the air cooling device 260 may also be other heat exchangers.

[0070] In yet another embodiment, the air heating device 240 comprises a fourth heat exchange element 241 and a fourth fan 242, and the fourth fan 242 is configured to supply air to the fourth heat exchange element 241. That is, the air heating device 240 is a fin-type heat exchanger that has relatively high heat exchange efficiency in a scenario of heat exchange with the air. In other embodiments, the air heating device 240 may also be other heat exchangers.

[0071] Each of the second heat exchange element 251, the third heat exchange element 261, and the fourth heat exchange element 241 described above has a heat exchange channel configured to allow the medium to flow through the heat exchange channel.

[0072] The dishwasher comprises a control component. The control component is configured to control operation of the second fan 252 during the washing stage and control operation of the third fan 262 and / or the fourth fan 242 during the drying stage. Controlling the operation of the second fan 252, the third fan 262, and the fourth fan 242 comprises controlling their startup, startup durations, and rotation speeds.

[0073] In a preferred embodiment, only one of the third fan 262 and the fourth fan 242 may be selected for use.

[0074] The switching device 220 is configured to: control, during the washing stage, the refrigerant discharged from the compression device 210 to pass through the first circulation heat exchange loop; and control, during the drying stage, the refrigerant discharged from the compression device 210 to pass through the second circulation heat exchange loop. That is, the switching device 220 is configured to control the refrigerant discharged from the compression device 210 to pass through the first circulation heat exchange loop, enabling the media in the first heat exchange channel and the second heat exchange channel to exchange heat with each other to produce hot water for the spraying system 110, and the switching device 220 is further configured to control the refrigerant discharged from the compression device 210 to pass through the second circulation heat exchange loop.

[0075] The switching device 220 may be a multi-way valve such as a three-way valve, or may be composed of a plurality of stop valves or common on-off valves. A control pipeline composed of a plurality of stop valves or on-off valves has the advantage of low noise. A control pipeline provided with the three-way valve has the advantage of occupying a small internal space of the dishwasher 10.

[0076] Exemplarily, the switching device 220 is a three-way valve. The three-way valve is a common valve configured to control a flow direction of a fluid between two inlets and one outlet or to distribute the fluid flow.

[0077] A general structure of the three-way valve comprises a valve body, a valve core, and a seal. These members cooperate with each other to enable the three-way valve to control the flow direction of the fluid or distribute the fluid flow. The valve body is a main component of the three-way valve, and typically has a structure made of metal or alloy similar to a tube connection. The valve body has two inlets and one outlet, and forms a "Y"-shaped or "T"-shaped structure. The valve core is a key component for controlling flow of the fluid. The valve core is typically located inside the body 100, and is movable to switch channels between the inlets and the outlet. A movement of the valve core may be controlled through manual operation or by an electric, pneumatic, or hydraulic actuator. The seal is configured to ensure sealing performance of the valve when the valve is closed, thereby avoiding a fluid leakage. The three-way valve typically has a plurality of connection manners such as welding, threading, or flanging, to be facilitated to be installed in a pipeline system. In addition, some three-way valves are equipped with actuators and used for automatically controlling the movement of the valve core to achieve remote or automated control. The actuators may be manual, electric, pneumatic, or hydraulic.

[0078] In some embodiments, the valve body comprises a first port, a second port, and a third port. In an embodiment, the first port is configured to be in communication with a discharge port of the compression device. The second port is configured to be in communication with the first heat exchange channel of the first heat exchange device 230. The third port is configured to be in communication with the air heating device 240. During the washing stage, the first port is in communication with the second port and isolated from the third port, and during the drying stage, the first port is in communication with the third port and isolated from the second port. That is, the first port, the second port, and the third port have a first communication state and a second communication state. In the first communication state, the first port is in communication with the second port and isolated from the third port, and in the second communication state, the first port is in communication with the third port and isolated from the second port.

[0079] It can be understood that the dishwasher 10 typically also comprises a tableware rack, a water collection sump, or some other auxiliary components such as thermal insulation boxes, a tableware support, and a filtration mesh, to ensure normal operation and convenient maintenance of the dishwasher 10, and details thereof are omitted herein.

[0080] During actual operation, the heat pump system 200 comprises a throttling device. The throttling device mainly comprises the following functions.

[0081] The throttling device can adjust a refrigerant flow rate. Specifically, the throttling device may throttle and depressurize a high-pressure liquid of the air heating device 240 into a low-pressure liquid, while simultaneously adjusting a flow rate of refrigerant entering an evaporator. In this way, it is ensured that the refrigerant flow rate in the heat pump system 200 is within a reasonable range.

[0082] Further, the throttling device can reduce heat exchange difficulty. For example, during the heat exchange, the throttling device allows refrigerant liquid to flow through a small hole, to form a local contraction, which increases a flow velocity and reduces a static pressure. This pressure difference enables the refrigerant to evaporate more easily in the evaporator, reducing the heat exchange difficulty and improving the heat exchange efficiency.

[0083] Furthermore, the throttling device can realize temperature control. The throttling device may also be an important part of temperature control. When the system needs a lower temperature, the refrigerant flow rate may be reduced by means of the throttling device, lowering an evaporation temperature. On the contrary, when the system needs a higher temperature, the refrigerant flow rate may be increased by means of the throttling device, increasing the evaporation temperature.

[0084] In an embodiment, in order to facilitate the temperature control during the washing stage and reduce the heat exchange difficulty during the washing stage, the heat pump system 200 comprises a first throttling device 270. The first throttling device 270 is disposed on a flow path between the first heat exchange device 230 and the second heat exchange device 250. Preferably, the first throttling device 270 is disposed on a flow path between the air cooling device 260 and the second heat exchange device 250.

[0085] In another embodiment, in order to facilitate the temperature control during the drying stage and reduce the heat exchange difficulty during the washing stage, the heat pump system 200 comprises a second throttling device 280. The second throttling device 280 is disposed on a flow path between the air heating device 240 and the air cooling device 260.

[0086] In an embodiment, the dishwasher body 100 comprises a housing. The housing comprises an outer shell, a door body assembly, a tub with a side having an opening, and a water collection sump disposed below the tub. The door body is rotatably disposed on the outer shell to expose or cover the opening. When the opening is covered by the door body, the washing chamber 101 is enclosed by the tub, the water collection sump, and the door body, and the internal circulation air duct 102 is formed between the outer shell and the tub.

[0087] Based on the previous embodiment, in order to improve the heat exchange efficiency of the second heat exchange device 250, the second heat exchange device 250 comprises a second heat exchange element 251 and a second fan 252. The second fan 252 is configured to supply air to the second heat exchange element 251.

[0088] In order to further improve the heat exchange efficiency of the second heat exchange device 250, the outer shell has an exhaust vent, and the second fan 252 is in communication with the exhaust vent at an air outlet side of the second fan 252. In this way, through the arrangement of the exhaust vent, the second heat exchange device 250 is allowed to exchange heat with the air outside the dishwasher 10, which improves the heat exchange efficiency of the second heat exchange device 250.

[0089] In addition, to make air exhaust smoother, the exhaust vent and the first opening are formed at one side of the outer shell, i.e., the exhaust vent is formed at a front side (a side facing towards the user). In this way, when the dishwasher 10 is placed against a wall, the exhaust vent is prevented from being blocked, or an air flow is prevented from being intercepted, making the air exhaust smoother.

[0090] In other embodiments, the second heat exchange device 250 may also be disposed outside the housing of the dishwasher 10.

[0091] In some embodiments, the air inlet 102a of the internal circulation air duct 102 is formed at an upper part of the tub, and the air outlet 102b of the internal circulation air duct 102 is formed at a lower part of the tub. With a midline of a height of the tub as a reference, a part above the midline is defined as the upper part, and a part below the midline is defined as the lower part. The air inlet 102a and the air outlet 102b of the internal circulation air duct 102 may be formed at one side surface of the tub.

[0092] By taking the tub in a predetermined direction as an example, the air inlet 102a and the air outlet 102b of the internal circulation air duct 102 may be formed at a left side surface, a right side surface, or a rear side surface of the tub. In this case, the air cooling device 260 and the air heating device 240 may also be disposed at one side surface of the tub, i.e., at a left side surface, a right side surface, or a rear side surface of the tub.

[0093] In another embodiment, the air cooling device 260 and the air heating device 240 are disposed below the tub.

[0094] In an embodiment, the dishwasher 10 further comprises an auxiliary electric heating device 300. In this embodiment, the auxiliary electric heating device 300 is an auxiliary heating device that uses electric energy as an energy source, converts the electric energy into heat energy, and provides additional heat when the main heat pump system 200 is unable to satisfy the requirements or when additional heating is required.

[0095] The auxiliary electric heating device 300 is disposed on the flow path between the second heat exchange channel of the first heat exchange device 230 and the spraying assembly 112. In this way, when the heat pump system 200 is unable to satisfy the requirements during the washing stage, this auxiliary electric heating device 300 may be started. Then, the auxiliary electric heating device 300 may also be disposed in the internal circulation air duct 102. In this way, when the heat pump system 200 is unable to satisfy the requirements during the drying stage, this auxiliary electric heating device 300 may also be started. It can be understood that the auxiliary electric heating device 300 may be disposed on each of flow paths between the internal circulation air duct 102, the casing 232, and the spraying assembly 112, or one auxiliary electric heating device 300 may carry out heating operation during both the washing stage and the drying stage.

[0096] Exemplarily, the auxiliary electric heating device 300 typically comprises an electric heating element, a control element, and a protection element.

[0097] The heating element is typically an electric heating wire, an electric heating tube, or an electric heating plate, which is a key component for converting the electric energy into the heat energy. The control element is configured to control heating power and an operation state of the electric heating element, and typically comprises a temperature sensor and a temperature controller. The temperature controller is typically integrated with other control elements into a control device. The protection element is configured to ensure safe operation of the electric heating device 300, preventing overheating or circuit failures, and typically comprises an overheat protector and a leakage protector.

[0098] When the heating system needs additional heating, the control device receives a signal and activates the electric heating element to perform heating. The electric heating element generates the heat energy under the action of an electric current and transfers the heat energy to a surrounding fluid (that is usually water or air). The temperature sensor monitors a fluid temperature and feeds back information to the control device. The control element adjusts heating power of the electric heating element based on the feedback information of the temperature sensor, to keep the fluid temperature within a predetermined range. When the temperature is too high or a failure occurs, the protection element automatically cuts off the power supply to ensure safe operation.

[0099] The embodiments as described above are merely exemplary implementations of the present invention, and are not therefore intended to limit the scope of the present invention. Any equivalent structural modification made based on the specification and the accompanying drawings of the present invention, or directly / indirectly application to other related art, are all comprised within the scope of the present invention under the technical concept of the present invention.

Examples

Embodiment Construction

[0039]Technical solutions according to embodiments of the present invention will be clearly and completely described below in combination with accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described below are only a part, rather than all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative labor shall fall within the scope of the present invention.

[0040]It should be noted that, when the embodiments of the present invention relate to directional indication (such as up, down, left, right, front, and back, etc.), the directional indication is only configured to explain a relative position relationship, a motion situation, etc. between components in a certain specific posture. When the specific posture changes, the directional indication also changes accordingly.

[0041]In addition, when the embodiments of the pre...

Claims

1. A dishwasher (10), comprising: a dishwasher body (100) having a washing chamber (101), an internal circulation air duct (102), and a spraying system (110), the internal circulation air duct (102) having an air inlet (102a) and an air outlet (102b), each of the air inlet (102a) and the air outlet (102b) being in communication with the washing chamber (101), and the spraying system (110) being configured to spray washing water into the washing chamber (101) to clean tableware placed in the washing chamber (101); and a heat pump system (200) comprising a compression device (210), a switching device (220), a first heat exchange device (230), a second heat exchange device (250), an air cooling device (260), and an air heating device (240), wherein the first heat exchange device (230) has a first heat exchange channel and a second heat exchange channel that are arranged for heat exchange with each other, wherein the compression device (210) forms a first circulation heat exchange loop with the first heat exchange channel and the second heat exchange device (250) through the switching device (220), and wherein the compression device (210) forms a second circulation heat exchange loop with the air heating device (240) and the air cooling device (260) through the switching device (220), wherein the second heat exchange channel is in communication with the spraying system (110); wherein the air cooling device (260) and the air heating device (240) are sequentially arranged in the internal circulation air duct (102) in a direction from the air inlet (102a) to the air outlet (102b); and wherein the switching device (220) is configured to: control, during a washing stage, refrigerant discharged from the compression device (210) to pass through the first circulation heat exchange loop; and control, during a drying stage, the refrigerant discharged from the compression device (210) to pass through the second circulation heat exchange loop.

2. The dishwasher (10) according to claim 1, wherein the first heat exchange device (230) comprises a casing (232) and a first heat exchange element (231) disposed in the casing (232), wherein the first heat exchange channel is defined by the first heat exchange element (231); and wherein the second heat exchange channel is formed between the casing (232) and the first heat exchange element (231).

3. The dishwasher (10) according to claim 2, wherein the switching device (220) comprises: a first port configured to be in communication with a discharge port of the compression device (210); a second port configured to be in communication with the first heat exchange channel of the first heat exchange device (230); and a third port configured to be in communication with the air heating device (240), wherein during the washing stage, the first port is in communication with the second port and isolated from the third port; and wherein during the drying stage, the first port is in communication with the third port and isolated from the second port.

4. The dishwasher (10) according to claim 2 or 3, wherein: the heat pump system (200) comprises a first throttling device (270) disposed on a flow path between the first heat exchange device (230) and the second heat exchange device (250); and / or the heat pump system (200) comprises a second throttling device (280) disposed on a flow path between the air heating device (240) and the air cooling device (260).

5. The dishwasher (10) according to claim 4, wherein: the second heat exchange device (250) comprises a second heat exchange element (251) and a second fan (252) configured to supply air to the second heat exchange element (251); the air cooling device (260) comprises a third heat exchange element (261) and a third fan (262) configured to supply air to the third heat exchange element (261); and / or the air heating device (240) comprises a fourth heat exchange element (241) and a fourth fan (242) configured to supply air to the fourth heat exchange element (241); and each of the second heat exchange element (251), the third heat exchange element (261), and the fourth heat exchange element (241) has a heat exchange channel, the heat exchange channel being configured to allow a medium to flow through the heat exchange channel.

6. The dishwasher (10) according to claim 5, wherein the dishwasher body (100) comprises a housing, the housing comprising an outer shell and a tub disposed in the outer shell, the internal circulation air duct (102) being formed between the outer shell and the tub, the outer shell having an exhaust vent, and the second fan (252) being in communication with the exhaust vent at an air outlet side of the second fan (252).

7. The dishwasher (10) according to claim 6, wherein: the housing further comprises a door body, the outer shell having a first opening, the tub having a second opening at a part of the tub corresponding to the first opening, the door body being disposed on the outer shell and configured to expose or cover the first opening and the second opening; and when the first opening and the second opening are covered by the door body, the washing chamber (101) is enclosed by the tub and the door body, and the exhaust vent and the first opening are formed at a same side of the outer shell.

8. The dishwasher (10) according to claim 6 or 7, wherein the air inlet (102a) of the internal circulation air duct (102) is formed at an upper part of the tub, and the air outlet (102b) of the internal circulation air duct (102) is formed at a lower part of the tub.

9. The dishwasher (10) according to any one of claims 2 to 9, wherein the spraying system (110) comprises: a water collection sump (113) in communication with the second heat exchange channel; a spraying assembly (112) disposed in the washing chamber (101) and configured to spray the washing water into the washing chamber (101), the second heat exchange channel being in communication with the spraying assembly (112) through a pipeline; and a water pump (111) disposed on a connection pipeline between the second heat exchange channel and the spraying assembly (112).

10. The dishwasher (10) according to claim 9, further comprising an auxiliary electric heating device (300), wherein: the auxiliary electric heating device (300) is disposed on a flow path between the second heat exchange channel of the first heat exchange device (230) and the spraying assembly (112); and / or the auxiliary electric heating device (300) is disposed in the internal circulation air duct (102).

Images