dishwasher

Abstract

The present invention discloses a dishwasher. The dishwasher includes a dishwasher body and a heat pump system. The dishwasher body has a heat exchange air duct, a washing chamber, an exhaust vent, and a spraying system. The washing chamber is in communication with an external environment via the exhaust vent. The heat exchange 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, and a third heat exchange device. The compression device is in communication with the first heat exchange channel and the third heat exchange device via the switching device to form a first circulation loop. The compression device is in communication with the second heat exchange device and the third heat exchange device via the switching device to form a second circulation loop. The second heat exchange channel is in communication with the spraying system. The second heat exchange device is disposed in the heat exchange air duct and is configured to supply hot air to the washing chamber. The present invention can improve washing and drying efficiency of the dishwasher.

Description

FIELD

[0001] The present invention relates to the technical field of electrical appliances, 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 relatively high 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, a dishwasher according to embodiments of the present invention comprises a dishwasher body and a heat pump system. The dishwasher body has a heat exchange air duct, a washing chamber, an exhaust vent, and a spraying system. The washing chamber is in communication with an external environment via the exhaust vent. The heat exchange air duct is in communication with the washing chamber. The spraying system is configured to spray washing water into the washing chamber. The heat pump system comprises a compression device, a switching device, a first heat exchange device, a second heat exchange device, and a third heat exchange 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 is in communication with the first heat exchange channel and the third heat exchange device via the switching device to form a first circulation loop. The compression device is in communication with the second heat exchange device and the third heat exchange device via the switching device to form a second circulation loop. The second heat exchange channel is in communication with the spraying system. The second heat exchange device is disposed in the heat exchange air duct and is configured to supply hot air to the washing chamber. The switching device is configured to: control, during a washing state, refrigerant discharged from the compression device to pass through the first circulation loop, and control, during a drying stage, the refrigerant discharged from the compression device to pass through the second circulation loop.

[0005] In an embodiment, the third heat exchange device may be disposed outside the heat exchange air duct and the washing chamber.

[0006] In an embodiment, the dishwasher body may comprise a first air damper movably disposed at the exhaust vent.

[0007] In an embodiment, the first air damper is configured to cover the exhaust vent during the washing stage and to expose the exhaust vent during the drying stage.

[0008] In an embodiment, the dishwasher body may further have an air inlet in communication with the external environment.

[0009] In an embodiment, the air inlet may be in communication with the heat exchange air duct and / or the washing chamber.

[0010] In an embodiment, the dishwasher body may further comprise a second air damper movably disposed at the air inlet.

[0011] In an embodiment, the second air damper is configured to cover the air inlet during the washing stage and to expose the air inlet during the drying stage.

[0012] In an embodiment, the dishwasher body may comprise an outer shell, a tub, and a door body.

[0013] In an embodiment, the outer shell may have a first opening.

[0014] In an embodiment, the tub may be disposed in the outer shell.

[0015] In an embodiment, the door body may be movably disposed on the outer shell to expose or cover the first opening.

[0016] In an embodiment, the washing chamber may be defined between the tub and the door body.

[0017] In an embodiment, the heat exchange air duct may be defined between the outer shell and the tub.

[0018] In an embodiment, the exhaust vent may be formed on the door body and / or the outer shell.

[0019] In an embodiment, the second heat exchange device may comprise a second heat exchange element and a second fan, and the second fan is configured to supply air to the second heat exchange element.

[0020] In an embodiment, the second fan may be in communication with the washing chamber at an air outlet side of the second fan.

[0021] In an embodiment, the third heat exchange device may comprise a third heat exchange element and a third fan, and the third fan is configured to supply air to the third heat exchange element.

[0022] In an embodiment, the outer shell may have an air outlet, and the third fan may be in communication with the air outlet at an air outlet side of the third fan.

[0023] In an embodiment, the spraying system may comprise a spraying assembly and a water pump.

[0024] In an embodiment, the spraying assembly may be disposed in the washing chamber and configured to spray washing water into the washing chamber.

[0025] In an embodiment, the second heat exchange channel may be in communication with the spraying assembly via a first pipeline.

[0026] In an embodiment, the water pump may be disposed on the first pipeline.

[0027] In an embodiment, the dishwasher may further comprise an electric heating device.

[0028] In an embodiment, the electric heating device may be disposed on the first pipeline, and is configured to heat the washing water in the first pipeline; and / or the electric heating device may be disposed in the heat exchange air duct.

[0029] In an embodiment, the switching device may comprise a first change-over valve.

[0030] In an embodiment, the first change-over valve may have a first port, a second port, and a third port.

[0031] In an embodiment, the first port may be in communication with a discharge port of the compression device.

[0032] In an embodiment, the second port may be in communication with the first heat exchange channel.

[0033] In an embodiment, the third port may be in communication with the second heat exchange device.

[0034] 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.

[0035] In an embodiment, the heat pump system may comprise a throttling pipeline.

[0036] In an embodiment, the first heat exchange channel may be in communication with the third heat exchange device via the throttling pipeline in the first circulation loop.

[0037] In an embodiment, the second heat exchange device may be in communication with the third heat exchange device via the throttling pipeline in the second circulation loop.

[0038] In an embodiment, the switching device may further comprise a first throttling member disposed on the throttling pipeline.

[0039] In an embodiment, the third heat exchange device may comprise a first heat exchange sub-device and a second heat exchange sub-device.

[0040] In an embodiment, the compression device may be in communication with the first heat exchange channel and the first heat exchange sub-device via the switching device to form the first circulation loop.

[0041] In an embodiment, the compression device may be in communication with the second heat exchange device and the second heat exchange sub-device via the switching device to form the second circulation loop.

[0042] In an embodiment, the switching device may further comprise a second change-over valve.

[0043] In an embodiment, the second change-over valve may have a fourth port, a fifth port, and a sixth port.

[0044] In an embodiment, the fourth port may be in communication with an intake port of the compression device.

[0045] In an embodiment, the fifth port may be in communication with the first heat exchange sub-device.

[0046] In an embodiment, the sixth port may be in communication with the second heat exchange sub-device.

[0047] In an embodiment, during the washing stage, the fourth port may be in communication with the fifth port and isolated from the sixth port, and during the drying stage, the fourth port may be in communication with the sixth port and isolated from the fifth port.

[0048] In an embodiment, the switching device may further comprise a second throttling member and a third throttling member.

[0049] In an embodiment, the second throttling member may be disposed in the first circulation loop and located between the first heat exchange channel and the first heat exchange sub-device.

[0050] In an embodiment, the third throttling member may be disposed in the second circulation loop and located between the second heat exchange device and the second heat exchange sub-device.

[0051] The dishwasher according to the present invention comprises the dishwasher body and the heat pump system. The dishwasher body has the heat exchange air duct, the washing chamber, the exhaust vent, and the spraying system. The washing chamber is in communication with the external environment via the exhaust vent, and the heat exchange air duct is in communication with the washing chamber. In this way, the heat exchange air duct, the washing chamber, and the exhaust vent are sequentially in communication with each other. The heat pump system comprises the compression device, the switching device, the first heat exchange device, the second heat exchange device, and the third heat exchange device. The first heat exchange device has the first heat exchange channel and the second heat exchange channel that are arranged for heat exchange with each other. The compression device is in communication with the first heat exchange channel and the third heat exchange device via the switching device to form a first circulation loop, and the second heat exchange channel is in communication with the spraying system. With this arrangement, during the washing stage, the refrigerant discharged from the compression device passes through the first circulation loop. The refrigerant releases heat through condensation when flowing through the first heat exchange channel and then absorbs heat through evaporation when flowing through the third heat exchange device. At this time, the first heat exchange device generates heat. The washing water in the spraying system absorbs the heat released by the refrigerant when flowing through the second heat exchange channel, making hot water. The prepared hot washing water is sprayed into the washing chamber to wash tableware placed in the washing chamber. The compression device is in communication with the second heat exchange device and the third heat exchange device via the switching device to form the second circulation loop. The second heat exchange device is disposed in the heat exchange air duct to supply hot air to the washing chamber. During the drying stage, the refrigerant discharged from the compression device passes through the second circulation loop. The refrigerant releases heat through condensation when flowing through the second heat exchange device and then absorbs heat through evaporation when flowing through the third heat exchange device. At this time, the second heat exchange device generates heat. The air is heated when passing through the second heat exchange device, then flows into the washing chamber to heat and dry the tableware in the washing chamber, and is finally discharged through the exhaust vent.

[0052] Therefore, the dishwasher according to the present invention uses independent heat exchange devices to generate heat during each of the washing and drying stages, enabling the dishwasher to use energy more effectively. Each circulation loop is dedicated to heat transfer in the washing and drying stages, which improves overall efficiency. In addition, the first heat exchange device and the second heat exchange device that are relatively independent of each other provide much flexibility for the dishwasher during washing and drying processes. Operation states and parameters of various stages may be independently controlled as needed to satisfy different washing and drying requirements. Since the heat pump system has its own heat exchange device, flow of the heat can be controlled more effectively, to reduce energy waste. In this way, it is beneficial to reduce energy consumption of the dishwasher and thus improve an energy utilization rate.BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to 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 a first embodiment of a dishwasher provided by the present invention. FIG. 2 is a schematic structural view of a second embodiment of a dishwasher provided by the present invention. Description of Reference Numerals:

[0054] 10, dishwasher; 100, dishwasher body; 110, heat exchange air duct; 120, washing chamber; 130, spraying system; 131, water pump; 132, spraying assembly; 133, first pipeline; 134, water cup; 200, heat pump system; 210, compression device; 220, switching device; 221, first change-over valve; 222, first throttling member; 223, second change-over valve; 224, second throttling member; 225, third throttling member; 230, first heat exchange device; 231, first heat exchange channel; 232, second heat exchange channel; 240, second heat exchange device; 241, second heat exchange element; 242, second fan; 250, third heat exchange device; 251, third heat exchange element; 252, third fan; 253, first heat exchange sub-device; 254, second heat exchange sub-device; 260, throttling pipeline; 300, electric heating device.

[0055] 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

[0056] 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.

[0057] 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.

[0058] 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 is, comprising three parallel solutions. Taking "A and / or B" as an example, comprising 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.

[0059] A dishwasher is a device for automatically cleaning tableware such as bowls, chopsticks, plates, dishes, knives, and forks. Commercially available fully-automatic dishwashers may be divided into two types comprising household and commercial dishwashers. Household fully-automatic dishwashers are suitable for families 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.

[0060] 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. For the convenience of understanding and explanation, in the accompanying drawings of the description of the present invention, spaces, grooves, or holes are indicated by solid arrows in the accompanying drawings.

[0061] Referring to FIG. 1 and FIG. 2, a dishwasher 10 according to an embodiment of the present invention comprises a dishwasher body 100 and a heat pump system 200. The dishwasher body 100 has a heat exchange air duct 110, a washing chamber 120, an exhaust vent, and a spraying system 130. The washing chamber 120 is in communication with an external environment via the exhaust vent. The heat exchange air duct 110 is in communication with the washing chamber 120. The spraying system 130 is configured to spray washing water into the washing chamber 120. 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 240, and a third heat exchange device 250. The first heat exchange device 230 has a first heat exchange channel 231 and a second heat exchange channel 232 that are arranged for heat exchange with each other. The compression device 210 is in communication with the first heat exchange channel 231 and the third heat exchange device 250 via the switching device 220 to form a first circulation loop. The compression device 210 is in communication with the second heat exchange device 240 and the third heat exchange device 250 via the switching device 220 to form a second circulation loop. The second heat exchange channel 232 is in communication with the spraying system 130. The second heat exchange device 240 is disposed in the heat exchange air duct 110 to supply hot air to the washing chamber 120. 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 loop, and control, during a drying stage, the refrigerant discharged from the compression device 210 to pass through the second circulation loop.

[0062] It should be understood that the switching device 220 is configured to control the refrigerant discharged from the compression device 210 to pass through the first circulation loop. In this way, media in the first heat exchange channel 231 and the second heat exchange channel 232 can exchange heat with each other to make hot water for the spraying system 130. In addition, the switching device 220 is also configured to control the refrigerant discharged from the compression device 210 to pass through the second circulation loop. The compression device 210 is not limited to a compressor. One, two, or more compressors may be provided, and the present invention is not limited in this regard. The refrigerant discharged from the compression device 210, for example, uses Freon such as chlorofluorocarbons, hydrochlorofluorocarbons, and hydrofluorocarbons, or uses hydrofluorocarbons.

[0063] The dishwasher 10 according to the present invention comprises the dishwasher body 100 and the heat pump system 200. The dishwasher body 100 has the heat exchange air duct 110, the washing chamber 120, the exhaust vent, and the spraying system 130. The washing chamber 120 is in communication with the external environment via the exhaust vent, and the heat exchange air duct 110 is in communication with the washing chamber 120. In this way, the heat exchange air duct 110, the washing chamber 120, and the exhaust vent are sequentially in communication with each other. The heat pump system 200 comprises the compression device 210, the switching device 220, the first heat exchange device 230, the second heat exchange device 240, and the third heat exchange device 250. The first heat exchange device 230 has the first heat exchange channel 231 and the second heat exchange channel 232 that are arranged for heat exchange with each other. The compression device 210 is in communication with the first heat exchange channel 231 and the third heat exchange device 250 via the switching device 220 to form the first circulation loop, and the second heat exchange channel 232 is in communication with the spraying system 130. With this arrangement, during the washing stage, the refrigerant discharged from the compression device 210 passes through the first circulation loop. The refrigerant releases heat through condensation when flowing through the first heat exchange channel 231 and then absorbs heat through evaporation when flowing through the third heat exchange device 250. At this time, the first heat exchange device 230 generates heat. The washing water in the spraying system 130 flows through the second heat exchange channel 232 to absorb the heat released by the refrigerant, making hot water. The prepared hot washing water is sprayed into the washing chamber 120 to clean tableware placed in the washing chamber 120. The compression device 210 is in communication with the second heat exchange device 240 and the third heat exchange device 250 via the switching device 220 to form the second circulation loop. The second heat exchange device 240 is disposed in the heat exchange air duct 110 to supply hot air to the washing chamber 120. During the drying stage, the refrigerant discharged from the compression device 210 passes through the second circulation loop. The refrigerant releases heat through condensation when flowing through the second heat exchange device 240 and then absorbs heat through evaporation when flowing through the third heat exchange device 250. At this time, the second heat exchange device 240 generates heat. The air is heated by passing through the second heat exchange device 240, then flows into the washing chamber 120 to heat and dry the tableware in the washing chamber 120, and is finally discharged through the exhaust vent.

[0064] Therefore, the dishwasher 10 according to the present invention uses independent heat exchange devices to generate heat during each of the washing and drying stages, enabling the dishwasher 10 to use energy more effectively. Each circulation loop is dedicated to heat transfer in the washing and drying stages, which improves overall efficiency. In addition, the first heat exchange device 230 and second heat exchange device 240 that are relatively independent of each other provide much flexibility for the dishwasher 10 during washing and drying processes. Operation states and parameters of various stages may be independently controlled as needed to satisfy different washing and drying requirements. Since the heat pump system 200 has an independent heat exchange device, the flow of heat can be controlled more effectively, to reduce energy waste. In this way, it is beneficial to reduce energy consumption of the dishwasher and thus improve an energy utilization rate.

[0065] The technical solution of the present invention improves the washing and drying efficiency, flexibility, and energy utilization rate of the dishwasher 10 by respectively using independent heat exchange devices to generate heat during the washing and drying stages of the dishwasher 10. This design is helpful to save energy and reduce maintenance costs while providing a better dishwashing experience.

[0066] A specific structure of the dishwasher 10 will be described below in detailed.

[0067] Referring to FIG. 1 and FIG. 2, in the embodiment of the present invention, the dishwasher 10 comprises a dishwasher body 100 and a heat pump system 200.

[0068] The dishwasher body 100 typically comprises a housing and a spraying system 130. A washing chamber 120 and a heat exchange air duct 110 are constructed by the housing. The housing typically comprises an outer shell, a tub, and a door body. The outer shell has a first opening. The tub is disposed inside the outer shell, and the door body is movably disposed on the outer shell to expose or cover the first opening. The washing chamber 120 is defined between the tub and the door body. The heat exchange air duct 110 is defined between the outer shell and the tub. The washing chamber 120 has an exhaust vent in communication with an external environment of the housing, and the heat exchange air duct 110 is in communication with the washing chamber 120. That is, the heat exchange air duct 110, the washing chamber 120, and the exhaust vent are sequentially in communication with each other. In some embodiments, the dishwasher 10 may be of an integrated structure formed by the door body and the tub.

[0069] The spraying system 130 is configured to spray washing water into the washing chamber 120 to clean the tableware placed in the washing chamber 120. The spraying system 130 typically comprises, but is not limited to, a water pump 131, a spraying assembly 132, a water cup 134, a pipeline assembly, a controller, a filter, a water-level sensor, and a drainage device. The water pump 131 is one of key components of the spraying system 130 of the dishwasher 10, and is configured to deliver a cleaning liquid for cleaning the tableware to a spraying arm or nozzle. The water pump 131 is typically driven by an electric motor to generate sufficient water pressure and flow rate to ensure a washing effect. The spraying assembly 132 typically comprises a spraying arm and / or a nozzle. The spraying assembly 132 is an outlet for the cleaning liquid to be sprayed in the spraying system 130 of the dishwasher 10. The spraying assembly 132 is typically located inside the dishwasher 10 and sprays the spraying water evenly onto surfaces of bowls, dishes, tableware, and the like through rotation or directional spraying, to clean the tableware. The pipeline assembly is configured to deliver water to the spraying arm and / or nozzle and ensuring that the water smoothly reaches a target region. The pipeline assembly is typically made of corrosion-resistant materials such as stainless steel or plastic. The controller of the spraying assembly 132 is configured to control start-stop, a spraying time, a spraying mode, and other parameters of the spraying assembly 132. The controller of the spraying assembly 132 is typically a part of an electronic control panel of the dishwasher 10. A user may set corresponding parameters through a button or touch screen on the panel. The filter is configured to filter impurities and residues in the washing water to prevent the nozzle and pipeline of the spraying system 130 from being blocked. In this way, it is beneficial to maintain normal operation and a cleaning effect of the spraying system 130. The water-level sensor is configured to monitor whether an internal water level of the water cup 134 of the dishwasher 10 is too high, to ensure stable operation of the water pump 131, thereby avoiding high water level during the drying stage and the drying stage. The drainage device is configured to discharge sewage generated during the cleaning process from the dishwasher 10 to maintain a clean environment. The drainage device typically comprises a drainage pipeline, a drainage pump 131, a drainage filter, and other components.

[0070] In an embodiment, the spraying system 130 comprises a water cup 134. The water cup 134 is disposed at a bottom of the tub. On the one hand, the water cup 134 is configured to store the washing water for rinsing the tableware. The washing water is pumped from the water cup 134 by the water pump 131 and delivered to the spraying assembly 132. On the other hand, the water cup 134 is also configured to collect the sewage generated after the tableware is cleaned. The sewage is collected by the water cup 134 and then discharged through the drainage pipeline.

[0071] The first heat exchange device 230 has a first heat exchange channel 231 and a second heat exchange channel 232. The refrigerant discharged from the compression device 210 may flow through the first heat exchange channel 231 to release heat through condensation. The second heat exchange channel 232 is in communication with the spraying system 130. The first heat exchange channel 231 and the second heat exchange channel 232 are arranged for heat exchange with each other. Specific shapes of the first heat exchange channel 231 and the second heat exchange channel 232 are not limited. For example, the first heat exchange channel 231 and the second heat exchange channel 232 are in, but not limited to, a straight tubular shape, a curved tubular shape, and a spiral shape. The first heat exchange device 230 comprises, but is not limited to, a tube-in-tube heat exchanger, a plate-type heat exchanger, a spiral heat exchanger, and a shell-and-tube heat exchanger.

[0072] The tube-in-tube heat exchanger comprises a tube and an outer shell. A heat transfer medium (usually a liquid or steam) passes through the tube and transfers heat to another medium (that may be a liquid, gas, or steam, and is a liquid in this embodiment). The outer shell is sleeved over the tube. The first heat exchange channel 231 is formed by the tube, and the second heat exchange channel 232 is formed between the tube and the outer shell. Alternatively, the second heat exchange channel 232 is formed by the tube, and the first heat exchange channel 231 is formed between the tube and the outer shell. Preferably, the first heat exchange channel 231 is formed by the tube, and the second heat exchange channel 232 is formed between the tube and the outer shell.

[0073] The plate-type heat exchanger is composed of a plurality of plates with gaps between the plates. The first heat exchange channel 231 and the second heat exchange channel 232 may be formed 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.

[0074] The spiral plate-type heat exchanger realizes heat transfer with high efficiency through a plurality of layers of spiral plate-type structures. This heat exchanger combines advantages of the plate-type heat exchanger and the tube-in-tube heat exchanger.

[0075] The spiral heat exchanger may effectively transfer the heat from one medium to the other medium via a spiral-shaped pipeline structure. The above two media refer to the refrigerant and water in this embodiment.

[0076] The second heat exchange device 240 is disposed in the heat exchange air duct 110. In this way, in a drying mode or the drying stage, the air in the heat exchange air duct 110 is heated when passing through the second heat exchange device 240, then flows through the washing chamber 120 to heat and dry the tableware in the washing chamber 120, and is finally discharged through the exhaust vent. The second heat exchange device 240 is mainly used for heating the air. The second heat exchange device 240 comprises cooling fins, a fan, a condensing tube, and the like, and heats air through forced convection generated by the fan. For example, the second heat exchange device 240 comprises a second heat exchange element 241 and a second fan 242. The second fan 242 is configured to supply air to the second heat exchange element 241. The second heat exchange element 241 has a heat exchange channel configured to allow for the medium to flow through the heat exchange channel. In this embodiment, the second heat exchange device 240 may also be an air-spiral heat exchanger. The air-spiral heat exchanger combines a design of the spiral heat exchanger and a function of the air heat exchanger, and exchanges heat with the air via the spiral-shaped pipeline structure.

[0077] In this embodiment, the third heat exchange device 250 is used for exchanging heat with the air, usually by absorbing the heat from the air. The third heat exchange device 250 comprises cooling fins, a fan, a heat dissipation tube, and the like, and cools air through forced convection. For example, the third heat exchange device 250 comprises a third heat exchange element 251 and a third fan 252. The third fan 252 is configured to supply air to the third heat exchange element 251. The third heat exchange element 251 has a heat exchange channel configured to allow for the medium to flow through the heat exchange channel.

[0078] In an embodiment, the third heat exchange device 250 is disposed outside the heat exchange air duct 110 and the washing chamber 120. With this arrangement, it is convenient to install the third heat exchange device 250, without providing the third heat exchange device 250 in the heat exchange air duct 110 and occupying a large space in the heat exchange air duct 110. Therefore, it is beneficial to reduce a volume of the heat exchange air duct 110, allowing the heat exchange air duct 110 to be easily formed in the dishwasher 10. This is beneficial to optimize a structural arrangement in the dishwasher 10. Moreover, the third heat exchange device 250 is disposed outside the washing chamber 120, which is beneficial to ensure sufficient capacity space of the washing chamber 120. An installation position of the third heat exchange device 250 has no specific requirements, and may be installed as needed, which improves installation convenience of the third heat exchange device 250. In this embodiment, the third heat exchange device 250 is disposed on a chassis inside the outer shell of the dishwasher 10.

[0079] In an embodiment, the dishwasher body 100 comprises a first air damper (not shown). The first air damper is movably disposed at the exhaust vent. The first air damper is configured to cover the exhaust vent during the washing stage and to expose the exhaust vent during the drying stage. It should be understood that a manner where the first air damper is movably disposed at the exhaust vent is not limited. For example, the first air damper is rotatably or slidably disposed at the exhaust vent. When the dishwasher 10 cleans the tableware during the washing stage, the first air damper covers the exhaust vent, to prevent the washing water from splashing out through the exhaust vent. When the dishwasher 10 heats and dries the tableware during the drying stage, the first air damper exposes the exhaust vent, enabling the air that dries the tableware in the washing chamber 120 to be discharged through the exhaust vent and form circulating air. In this way, it is beneficial to increase a drying speed.

[0080] In an embodiment, the dishwasher body 100 also has an air inlet in communication with the external environment. The air inlet is in communication with the heat exchange air duct 110 and / or the washing chamber 120. It should be understood that during the drying stage, air outside the dishwasher 10 enters from the air inlet. The air inlet may be in communication with the heat exchange air duct 110, or the washing chamber 120, or both the heat exchange air duct 110 and the washing chamber 120, as long as the air may flow through the heat exchange air duct 110 and the washing chamber 120 and be discharged through the exhaust vent. It should be understood that there are various ways to form the air inlet. For example, the air inlet may be formed on the door body, or the air inlet is formed between the door body and the outer shell, or the air inlet is disposed on the outer shell, or the door body opens during the drying stage to form the air inlet, which is not limited in the present invention. By forming the air inlet, during the drying stage, it is beneficial to improve smoothness of the air being discharged through the exhaust vent after flowing through the heat exchange air duct 110 and the washing chamber 120.

[0081] In an embodiment, the dishwasher body 100 further comprises a second air damper (not shown). The second air damper is movably disposed at the air inlet. The second air damper is configured to cover the air inlet during the washing stage and to expose the air inlet during the drying stage. It should be understood that the air inlet in this solution may be formed on the door body or the outer shell. By providing the second air damper at the air inlet, when the dishwasher 10 cleans the tableware during the washing stage, the second air damper covers the air inlet to prevent the washing water from splashing out through the air inlet. When the dishwasher 10 heats and dries the tableware during the drying stage, the second air damper exposes the air inlet, enabling the air to smoothly flow through the heat exchange air duct 110 and the washing chamber 120 and be discharged through the exhaust vent. In this way, it is beneficial to increase the drying speed.

[0082] In an embodiment, the dishwasher body 100 comprises an outer shell, a tub, and a door body. The tub is disposed in the outer shell. The outer shell has a first opening. The door body is movably disposed on the outer shell to expose or cover the first opening. The washing chamber 120 is defined between the tub and the door body, and the heat exchange air duct 110 is defined between the outer shell and the tub. The exhaust vent is formed on the door body and / or the outer shell.

[0083] It should be understood that when the exhaust vent is formed on the door body, the exhaust vent and the door body are disposed 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 the wall, the exhaust vent is prevented from being blocked, or the air flow is prevented from being intercepted, making ventilation smoother. In addition, a specific position of the exhaust vent formed on the outer shell is not limited, as long as the air in the washing chamber 120 may be discharged from the exhaust vent. By forming the exhaust vent, the air in the washing chamber 120 is allowed to exchange heat with the air outside the dishwasher 10, which is beneficial to improve heat exchange efficiency of the second heat exchange device 240.

[0084] Referring to FIG. 1, in an embodiment, the second heat exchange device 240 comprises a second heat exchange element 241 and a second fan 242. The second fan 242 is configured to supply air to the second heat exchange element 241, and the second fan 242 is in communication with the washing chamber 120 at an air outlet side of the second fan 242. It should be understood that the second heat exchange element 241 has a heat exchange channel configured to allow for the refrigerant to flow through the heat exchange channel. By providing the second fan 242, the heat exchange efficiency of the second heat exchange device 240 is increased, improving a drying speed of the tableware.

[0085] Referring to FIG. 1, in an embodiment, the third heat exchange device 250 comprises a third heat exchange element 251 and a third fan 252. The third fan 252 is configured to supply air to the third heat exchange element 251. The outer shell has an air outlet, and the third fan 252 is in communication with the air outlet at an air outlet side of the third fan 252. It should be understood that the third heat exchange element 251 has a heat exchange channel configured to allow for the refrigerant to flow through the heat exchange channel. By providing the third fan 252, heat exchange efficiency of the third heat exchange device 250 is increased while preventing the third heat exchange element 251 from frosting during the drying stage.

[0086] In an embodiment, the third heat exchange device 250 may also be disposed outside the housing of the dishwasher 10.

[0087] In an embodiment, the second heat exchange device 240 and the third heat exchange device 250 are disposed below the tub.

[0088] In an embodiment, the exhaust vent is formed at an upper part of the tub, and the air inlet is formed at a lower part of the tub. That is, with this arrangement, the air inlet is formed below the exhaust vent. A median line of a height of the tub may be used as a reference point. A part above the median line is referred to as the upper part, and a part below the median line is referred to as the lower part. In addition, the air inlet and the exhaust vent may also be formed at one side of the tub.

[0089] Referring to FIG. 1 and FIG. 2, in an embodiment, the spraying system 130 comprises a water pump 131 and a spraying assembly 132. The spraying assembly 132 is disposed in the washing chamber 120 and is configured to spray washing water into the washing chamber 120. The second heat exchange channel 232 is in communication with the spraying assembly 132 via a first pipeline 133, and the water pump 131 is disposed on the first pipeline 133.

[0090] It should be understood that the water pump 131 is disposed on the first pipeline 133. The spraying system 130 further comprises a water cup 134. The water cup 134 is disposed at a bottom of the washing chamber 120. The water cup 134, the second heat exchange channel 232, the water pump 131, and the spraying assembly 132 are sequentially in communication with each other, enabling the water pump 131 to deliver the washing water in the water cup 134 to the spraying assembly 132. The spraying assembly 132 sprays the washing water into the washing chamber 120 again to clean the tableware placed in the washing chamber 120. By providing the water pump 131, it is ensured that the spraying assembly 132 can generate sufficient water pressure and flow rate to ensure the washing effect.

[0091] In an embodiment, the dishwasher 10 further comprises an electric heating device 300. The electric heating device 300 is disposed on the first pipeline 133 and is configured to heat the washing water in the first pipeline 133. It should be understood that the electric heating device 300 is an auxiliary heating device using electric energy as an energy source, converts the electric energy into heat energy, and mainly provides additional heat when the heat pump system 200 is unable to satisfy the requirements or additional heating is needed. The electric heating device 300 is configured to heat the washing water in the first pipeline 133 when the electric heating device 300 is disposed on the first pipeline 133. During the washing stage, when the heat pump system 200 is unable to satisfy the requirements, this electric heating device 300 may be started.

[0092] In an embodiment, the electric heating device 300 is disposed in the heat exchange air duct 110. With this arrangement, during the drying stage, when the heat pump system 200 is unable to satisfy the requirements, this electric heating device 300 may also be started.

[0093] It should be understood that the electric heating device 300 is disposed on each of the heat exchange air duct 110 and the first pipeline 133 between the second heat exchange channel 232 and the spraying assembly 132. Alternatively, one electric heating device 300 may be heated during both the washing stage and the drying stage. The electric heating device 300 typically comprises an electric heating element, a control element, and a protection element. The electric heating element is typically an electric heating wire, an electric heating tube, or an electric heating plate. The electric heating element 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, avoiding overheating or circuit failures, and typically comprises an overheat protector and a leakage protector. When the dishwasher 10 needs additional heating, the control device receives a signal and makes the electric heating element heated. 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 set range. In response to the temperature being too high or occurring a failure, the protection element automatically cuts off the power supply to ensure safe operation.

[0094] In this embodiment, the switching device 220 is configured to control the refrigerant discharged from the compression device 210 to pass through the first circulation loop, which allows the media in the first heat exchange channel 231 and the second heat exchange channel 232 to exchange heat with each other, to make the hot water for the spraying system 130. In addition, the switching device 220 is also configured to control the refrigerant discharged from the compression device 210 to pass through the second circulation heat exchange loop.

[0095] Referring to FIG. 1, in an embodiment, the switching device 220 comprises a first change-over valve 221. The first change-over valve 221 has a first port, a second port, and a third port. The first port is in communication with a discharge port of the compression device 210. The second port is in communication with the first heat exchange channel 231. The third port is in communication with the second heat exchange device 240. During the washing stage, the first port is in communication with the second port and isolated from the third port. During the drying stage, the first port is in communication with the third port and isolated from the second port.

[0096] It should be understood that the first change-over valve 221 may be a multi-way valve such as a three-way valve or be composed of a plurality of stop valves or common on-off valves. A control pipeline composed of the plurality of stop valves or on-off valves has the advantage of low noise. The control pipeline provided with the three-way valve has the advantage of occupying a small internal space of the dishwasher 10. In this solution, the first change-over valve 221 is a three-way valve. The three-way valve is configured to control a flow direction of the fluid between an inlet and two outlets or to distribute the flow direction of the fluid. The three-way valve comprises a valve body, a valve core, and a sealing member. The valve body has an inlet and two outlets, forming a "Y"-shaped or "T"-shaped structure. The valve core is a key component for controlling the flow of fluid, is usually located inside the valve body, and is movable to change a channel between the inlet and the outlets. The movement of the valve core may be operated manually or controlled by an electric, pneumatic, or hydraulic actuator. The sealing member is configured to ensure sealing performance when the valve core is closed to prevent 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, in an embodiment, the three-way valve is electrically connected to the actuator to automatically control the movement of the valve core, to achieve remote or automated control. The actuator may be controlled manually, electrically, pneumatically, or hydraulically. In this solution, the first change-over valve 221 comprises a three-way valve. Providing the three-way valve may simply and effectively switch a flow direction of the refrigerant, making the heat pump system 200 simple in structure, occupy less space, and easy to be assembled.

[0097] It should be understood that the heat pump system 200 comprises a throttling member. Main functions of the throttling member will be described below.

[0098] The throttling member can adjust a refrigerant flow rate. Specifically, the throttling member may throttle and depressurize a high-pressure liquid 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.

[0099] Further, the throttling member can reduce heat exchange difficulty. For example, during the heat exchange, the throttling member 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 makes the refrigerant easier evaporate in the evaporator, reducing the heat exchange difficulty and improving the heat exchange efficiency.

[0100] Furthermore, the throttling member can realize temperature control. The throttling member 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 member, 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 member, increasing the evaporation temperature.

[0101] Referring to FIG. 1, in an embodiment, the heat pump system 200 comprises a throttling pipeline 260. The first heat exchange channel 231 is in communication with the third heat exchange device 250 via the throttling pipeline 260 in the first circulation loop. The second heat exchange device 240 is in communication with the third heat exchange device 250 via the throttling pipeline 260 in the second circulation loop. The switching device 220 further comprises a first throttling member 222 disposed on the throttling pipeline 260.

[0102] It should be understood that the first throttling member 222 may be an electronic expansion valve. During the washing stage, the refrigerant discharged from the compression device 210 flows along the first circulation loop. The refrigerant releases heat through condensation when flowing through the first heat exchange channel 231, then is throttled by the first throttling member 222, absorbs heat through evaporation when flowing through the third heat exchange device 250, and finally returns to the compression device 210. During the drying stage, the refrigerant discharged from the compression device 210 flows along the second circulation loop. The refrigerant releases heat through condensation when flowing through the second heat exchange device 240, then is throttled by the first throttling member 222, absorbs heat by evaporation when flowing through the third heat exchange device 250, and finally returns to the compression device 210. It can be seen that the first throttling member 222 in this solution may perform throttling during a plurality of operation stages. That is, the first throttling member 222 may control the flow velocity and flow rate of the refrigerant, adjust the evaporation temperature and pressure, and thus control the heat exchange effect of the heat pump system 200.

[0103] Referring to FIG. 2, in another embodiment, the third heat exchange device 250 comprises a first heat exchange sub-device 253 and a second heat exchange sub-device 254. The compression device 210 is in communication with the first heat exchange channel 231 and the first heat exchange sub-device 253 via the switching device 220 to form the first circulation loop. The compression device 210 is in communication with the second heat exchange device 240 and the second heat exchange sub-device 254 via the switching device 220 to form the second circulation loop.

[0104] It should be understood that the first heat exchange sub-device 253 and the second heat exchange sub-device 254 are independent of each other, making the first circulation loop and the second circulation loop independent of each other. Independent heat exchange components are used in each of the washing stage and the drying stage of the dishwasher 10. The two circulation loops may each be configured for the heat transfer in the washing stage and the drying stage, improving the overall efficiency. Moreover, the two relatively independent circulation loops make the dishwasher 10 more flexible during the washing and drying processes. The operation state and parameter of each circulation loop may be independently controlled as needed to satisfy different washing and drying requirements. In addition, structures of the first heat exchange sub-device 253 and the second heat exchange sub-device 254 are the same as a structure of the second heat exchange device 240. The main difference lies in arrangement positions of the first heat exchange sub-device 253, the second heat exchange sub-device 254, and the second heat exchange device 240, which realizes a difference between refrigeration and heating, and details thereof are omitted herein.

[0105] Therefore, it is beneficial to save energy and reduce the maintenance costs while improving the washing and drying efficiency, flexibility, and energy utilization rate of the dishwasher 10 by respectively using independent heat exchange components in the washing stage and the drying stage of the dishwasher 10.

[0106] Referring to FIG. 2, in another embodiment, the switching device 220 further comprises a second change-over valve 223. The second change-over valve 223 has a fourth port, a fifth port, and a sixth port. The fourth port is in communication with an intake port of the compression device 210. The fifth port is in communication with the first heat exchange sub-device 253. The sixth port is in communication with the second heat exchange sub-device 254. During the washing stage, the fourth port is in communication with the fifth port and isolated from the sixth port. During the drying stage, the fourth port is in communication with the sixth port and isolated from the fifth port. It should be understood that a structure of the second change-over valve 223 may be the same as a structure of the first change-over valve 221, and specific details thereof are omitted herein. The second change-over valve 223 in this solution comprises a three-way valve. The arrangement of the three-way valve may simply and effectively switch the flow direction of the refrigerant, making the heat pump system 200 simple in structure, occupy less space, and easy to be assembled.

[0107] Referring to FIG. 2, in another embodiment, the switching device 220 further comprises a second throttling member 224 and a third throttling member 225. The second throttling member 224 is disposed in the first circulation loop and located between the first heat exchange channel 231 and the first heat exchange sub-device 253. The third throttling member 225 is disposed in the second circulation loop and located between the second heat exchange device 240 and the second heat exchange sub-device 254.

[0108] It should be understood that structures of the second throttling member 224 and the third throttling member 225 may be the same as a structure of the first throttling member 222, and details thereof are omitted herein. In this embodiment, by providing the second throttling member 224, it is convenient to temperature control during the washing stage and to reduce heat exchange difficulty during the washing stage. By providing the third throttling member 225, it is convenient to temperature control during the drying stage and to reduce heat exchange difficulty during the drying stage. That is, the second throttling member 224 in this solution throttles the refrigerant during the washing stage, and the third throttling member 225 throttles the refrigerant during the drying stage. The second throttling member 224 and the third throttling member 225 are independent of each other, which is beneficial to improve the washing and drying efficiency of the dishwasher 10.

[0109] The embodiments as described above are merely exemplary implementations of the present invention, and is not therefore intended to limit the scope of the present invention. Any equivalent structural modification made based on the description and the accompanying drawings of the present invention, or directly / indirectly application to other related art, shall all fall within the scope of the present invention under the technical concept of the present invention.

Claims

1. A dishwasher (10), comprising: a dishwasher body (100) having a heat exchange air duct (110), a washing chamber (120), an exhaust vent, and a spraying system (130), the washing chamber (120) being in communication with an external environment via the exhaust vent, the heat exchange air duct (110) being in communication with the washing chamber (120), and the spraying system (130) being configured to spray washing water into the washing chamber (120); 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 (240), and a third heat exchange device (250), wherein the first heat exchange device (230) has a first heat exchange channel (231) and a second heat exchange channel (232) that are arranged for heat exchange with each other, wherein the compression device (210) is in communication with the first heat exchange channel (231) and the third heat exchange device (250) via the switching device (220) to form a first circulation loop, and wherein the compression device (210) is in communication with the second heat exchange device (240) and the third heat exchange device (250) via the switching device (220) to form a second circulation loop; wherein the second heat exchange channel (232) is in communication with the spraying system (130); wherein the second heat exchange device (240) is disposed in the heat exchange air duct (110) and is configured to supply hot air to the washing chamber (120); 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 loop; and control, during a drying stage, the refrigerant discharged from the compression device (210) to pass through the second circulation loop.

2. The dishwasher (10) according to claim 1, wherein the third heat exchange device (250) is disposed outside the heat exchange air duct (110) and the washing chamber (120).

3. The dishwasher (10) according to claim 1 or 2, wherein the dishwasher body (100) comprises a first air damper movably disposed at the exhaust vent, wherein the first air damper is configured to cover the exhaust vent during the washing stage and to expose the exhaust vent during the drying stage.

4. The dishwasher (10) according to any one of claims 1 to 3, wherein the dishwasher body (100) further has an air inlet in communication with the external environment, the air inlet being in communication with the heat exchange air duct (110) and / or the washing chamber (120).

5. The dishwasher (10) according to claim 4, wherein the dishwasher body (100) comprises a second air damper movably disposed at the air inlet, wherein the second air damper is configured to cover the air inlet during the washing stage and to expose the air inlet during the drying stage.

6. The dishwasher (10) according to any one of claims 1 to 5, wherein the dishwasher body (100) comprises: an outer shell having a first opening; a tub disposed in the outer shell; and a door body movably disposed on the outer shell to expose or cover the first opening, wherein the washing chamber (120) is defined between the tub and the door body; wherein the heat exchange air duct (110) is defined between the outer shell and the tub; and wherein the exhaust vent is formed on the door body and / or the outer shell.

7. The dishwasher (10) according to claim 6, wherein: the second heat exchange device (240) comprises a second heat exchange element (241) and a second fan (242), the second fan (242) being configured to supply air to the second heat exchange element (241), and the second fan (242) being in communication with the washing chamber (120) at an air outlet side of the second fan (242); and / or the third heat exchange device (250) comprises a third heat exchange element (251) and a third fan (252), the third fan (252) being configured to supply air to the third heat exchange element (251), the outer shell having an air outlet, and the third fan (252) being in communication with the air outlet at an air outlet side of the third fan (252).

8. The dishwasher (10) according to any one of claims 1 to 7, wherein the spraying system (130) comprises: a spraying assembly (132) disposed in the washing chamber (120) and configured to spray the washing water into the washing chamber (120), the second heat exchange channel (232) being in communication with the spraying assembly (132) via a first pipeline (133); and a water pump (131) disposed on the first pipeline (133).

9. The dishwasher (10) according to claim 8, further comprising an electric heating device (300), wherein: the electric heating device (300) is disposed on the first pipeline (133) and configured to heat the washing water in the first pipeline (133); and / or the electric heating device (300) is disposed in the heat exchange air duct (110).

10. The dishwasher (10) according to any one of claims 1 to 9, wherein the switching device (220) comprises a first change-over valve (221) having a first port, a second port, and a third port, the first port being in communication with a discharge port of the compression device (210), the second port being in communication with the first heat exchange channel (231), and the third port being in communication with the second heat exchange 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.

11. The dishwasher (10) according to any one of claims 1 to 10, wherein: the heat pump system (200) comprises a throttling pipeline (260), the first heat exchange channel (231) being in communication with the third heat exchange device (250) via the throttling pipeline (260) in the first circulation loop, the second heat exchange device (240) being in communication with the third heat exchange device (250) via the throttling pipeline (260) in the second circulation loop; and the switching device (220) further comprises a first throttling member (222) disposed on the throttling pipeline (260).

12. The dishwasher (10) according to any one of claims 1 to 10, wherein the third heat exchange device (250) comprises a first heat exchange sub-device (253) and a second heat exchange sub-device (254), the compression device (210) being in communication with the first heat exchange channel (231) and the first heat exchange sub-device (253) via the switching device (220) to form the first circulation loop, and the compression device (210) being in communication with the second heat exchange device (240) and the second heat exchange sub-device (254) via the switching device (220) to form the second circulation loop.

13. The dishwasher (10) according to claim 12, wherein the switching device (220) further comprises a second change-over valve (223) having a fourth port, a fifth port, and a sixth port, the fourth port being in communication with an intake port of the compression device (210), the fifth port being in communication with the first heat exchange sub-device (253), and the sixth port being in communication with the second heat exchange sub-device (254), wherein during the washing stage, the fourth port is in communication with the fifth port and isolated from the sixth port; and wherein during the drying stage, the fourth port is in communication with the sixth port and isolated from the fifth port.

14. The dishwasher (10) according to claim 12 or 13, wherein the switching device (220) further comprises: a second throttling member (224) disposed in the first circulation loop and located between the first heat exchange channel (231) and the first heat exchange sub-device (253); and a third throttling member (225) disposed in the second circulation loop and located between the second heat exchange device (240) and the second heat exchange sub-device (254).

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