A dishwasher and a control method of a dishwasher

Abstract

This application discloses a dishwasher and a control method for the dishwasher. The method includes: during the execution of the dishwasher's washing program, if hot water is used in the current washing stage, determining whether the water demand for the current washing stage is greater than a preset water demand threshold; if the water demand is greater than the preset water demand threshold, controlling a fluid switching device to switch to a first state, and controlling a heater to start operation after a first preset time, so that cold water supplied by an external water source is heated into hot water and enters the washing chamber; if the water demand is less than or equal to the preset water demand threshold, controlling the fluid switching device to switch to a second state, so that preheated hot water stored in a preheating tank enters the washing chamber. This application can preheat the cold water in the preheating tank and use all the preheated hot water for the washing stage with low water demand, so that the washing stage requires no additional heating or requires very little energy for additional heating, thereby significantly improving the washing effect and energy saving effect.

Description

Technical Field

[0001] This application relates to the technical field of time zone information, and more particularly to a dishwasher and a method for controlling the dishwasher. Background Technology

[0002] The energy consumption of dishwashers mainly comes from the heating process; therefore, reducing heating energy consumption is a key direction in dishwasher energy-saving technology research. In existing technologies, some solutions reduce heater energy consumption by recycling hot wastewater for reuse. Specifically, dishwashers typically have a water tank to collect and store hot wastewater, which is then mixed with a large amount of cold water for subsequent washing stages. However, using diluted hot wastewater to wash dishes results in poor washing performance and low energy efficiency.

[0003] Therefore, improving washing performance while achieving significant energy savings is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] This application provides a dishwasher and a method for controlling the dishwasher, which can improve washing performance and energy efficiency.

[0005] In a first aspect, a dishwasher is provided, comprising: The washing chamber is used to hold dishes to be washed. The preheating water tank and the washing chamber are arranged adjacent to each other and the gap between the water tank and the washing chamber is less than or equal to a first preset gap threshold. When hot water is injected into the washing chamber to wash the tableware to be washed, the washing chamber transfers heat to the preheating water tank to preheat the cold water stored in the preheating water tank. The inlet pipe is used to introduce cold water supplied by an external water source into the preheating water tank and the washing chamber, and also to introduce preheated water stored in the preheating water tank into the washing chamber. A fluid switching device is used to supply cold water from an external water source to the washing chamber through an inlet pipe when in the first state, and also to supply preheated water stored in a preheating tank to the washing chamber through an inlet pipe when in the second state. A heater is used to heat the cold water entering the washing chamber; The controller is configured as follows: During the execution of the dishwasher's washing program, if hot water is used in the current washing stage, it is determined whether the water demand for the current washing stage is greater than the preset water threshold. The preset water threshold is determined based on the amount of preheated hot water in the preheating tank. If the water demand exceeds the preset water threshold, the fluid switching device is switched to the first state, and after a first preset time, the heater is started to run so that the cold water supplied by the external water source is heated into hot water and then enters the washing chamber. If the required water volume is less than or equal to the preset water volume threshold, the control fluid switching device switches to the second state so that the preheated water stored in the preheated water tank enters the washing chamber.

[0006] Secondly, a control method for a dishwasher is provided, applied to the dishwasher of the first aspect, the method comprising: During the execution of the dishwasher's washing program, if hot water is used in the current washing stage, it is determined whether the water demand for the current washing stage is greater than the preset water threshold. The preset water threshold is determined based on the amount of preheated hot water in the preheating tank. If the water demand exceeds the preset water threshold, the fluid switching device is switched to the first state, and after a first preset time, the heater is started to run so that the cold water supplied by the external water source is heated into hot water and then enters the washing chamber. If the required water volume is less than or equal to the preset water volume threshold, the control fluid switching device switches to the second state so that the preheated water stored in the preheated water tank enters the washing chamber.

[0007] In the above embodiments, the cold water in the preheating tank can be preheated, resulting in high cleanliness of the preheated water. Using high-cleanliness preheated water to wash the tableware effectively avoids secondary contamination, thereby improving the washing effect. Furthermore, for washing stages using hot water, if the washing stage has a high water demand, the controller controls the fluid switching device to connect the external water supply to the washing chamber, heating the external cold water before washing the tableware, ensuring that the temperature and volume of the preheated water are effectively maintained for subsequent washing stages requiring lower water volumes. If the washing stage has a low water demand, the controller controls the fluid switching device to connect the preheating tank to the washing chamber, using 100% preheated water. Because the preheated water is high in temperature and undiluted, no additional heating is required or the energy consumption for additional heating is minimal, significantly reducing energy consumption in this washing stage and maximizing energy savings. Therefore, the embodiments of this application can improve both washing performance and energy efficiency. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a dishwasher provided in an embodiment of this application; Figure 2 This is a schematic diagram illustrating the relative positional relationship between a preheating water tank and a washing chamber, provided in an embodiment of this application. Figure 3 This is a schematic diagram showing the relative positional relationship between the preheating water tank and the washing chamber, provided in another embodiment of this application. Figure 4 This is a schematic diagram showing the relative positional relationship between a preheating water tank and a washing chamber, as provided in another embodiment of this application. Figure 5This is a schematic diagram of another dishwasher provided in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of another dishwasher provided in the embodiments of this application; Figure 7 This is a schematic diagram showing the relative positional relationship between at least a portion of the pipes of a preheating water tank and a first drain pipe, as provided in an embodiment of this application. Figure 8 This is a schematic diagram showing the relative positional relationship between at least a portion of the pipes of a preheating water tank and a first drain pipe, as provided in another embodiment of this application. Figure 9 This is a schematic diagram showing the relative positional relationship between at least a portion of the pipes of a preheating water tank and a first drain pipe, as provided in another embodiment of this application. Figure 10 This is a flowchart of a dishwasher control method provided in an embodiment of this application. Detailed Implementation

[0009] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0010] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0011] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0012] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0013] The dishwasher provided in this application can have various implementation forms, such as a household dishwasher, a commercial dishwasher, an industrial dishwasher, etc. Figure 1 and Figure 2 This is one specific embodiment of the dishwasher of this application.

[0014] Figure 1This is a schematic diagram of the structure of a dishwasher provided in an embodiment of this application. See also... Figure 1 The dishwasher includes: Washing chamber 10 is used to hold dishes to be washed; The preheating water tank 20 and the washing chamber 10 are arranged adjacent to each other and the gap between the water tank and the washing chamber 10 is less than or equal to a first preset gap threshold. When hot water is injected into the washing chamber 10 to wash the tableware to be washed, the washing chamber 10 transfers heat to the preheating water tank 20 to preheat the cold water stored in the preheating water tank 20. The water inlet pipe 30 is used to introduce cold water supplied by an external water source into the preheating water tank 20 and the washing chamber 10, and also to introduce the preheated water stored in the preheating water tank 20 into the washing chamber 10. The fluid switching device 40 is used to supply cold water from an external water source to the washing chamber 10 through the water inlet pipe 30 when in the first state, and also to supply preheated water stored in the preheated water tank 20 to the washing chamber 10 through the water inlet pipe 30 when in the second state. Heater 50 is used to heat the cold water entering the washing chamber 10; Controller 60 is configured as follows: During the execution of the dishwasher's washing program, if hot water is used in the current washing stage, it is determined whether the water demand for the current washing stage is greater than the preset water threshold. The preset water threshold is determined based on the amount of preheated hot water in the preheated water tank 20. If the water demand exceeds the preset water threshold, the fluid switching device 40 is switched to the first state, and after a first preset time, the heater 50 is started to run so that the cold water supplied by the external water source is heated into hot water and enters the washing chamber 10. If the required water volume is less than or equal to the preset water volume threshold, the control fluid switching device 40 switches to the second state so that the preheated water stored in the preheated water tank 20 enters the washing chamber 10.

[0015] Specifically, the washing chamber 10 is equipped with shelves ( Figure 1 (Not shown) and a spray arm. A shelf is used to hold dishes to be washed. The spray arm has multiple spray holes for spraying washing water onto the dishes.

[0016] Specifically, the preheating water tank 20 is used to store washing water. The preheating water tank 20 is located near the washing chamber 10, that is, the gap between the outer wall of the preheating water tank 20 facing the washing chamber 10 and the outer wall of the washing chamber 10 facing the preheating water tank 20 is less than or equal to a first preset gap threshold. In this way, when hot water is injected into the washing chamber 10 to wash the dishes (e.g., during the main wash), the preheating water tank 20 can absorb the heat transferred from the washing chamber 10 to preheat the cold water stored inside.

[0017] Regarding the relative positional relationship between the preheating water tank 20 and the washing chamber 10, those skilled in the art can set it according to the actual situation. For example, the preheating water tank 20 can be set outside the side wall, outside the bottom, outside the top of the washing chamber 10, or at least partially around the outer wall of the washing chamber 10, as long as it can effectively receive heat from the washing chamber 10. This application does not limit this.

[0018] Regarding the size of the first preset gap, those skilled in the art can set it according to actual conditions. For example, the first preset gap can be arbitrarily selected from 0mm to 10mm, as long as it can effectively receive heat from the washing chamber 10. This application does not limit this. Optionally, the first preset gap can be arbitrarily selected from 2mm to 5mm. In this way, the gap between the preheating water tank 20 and the outer wall of the washing chamber 10 will not be too large, avoiding excessive heat loss during the transfer process, and also reserving thermal expansion space for the preheating water tank 20 and the washing chamber 10.

[0019] Regarding the shape of the preheating water tank 20, those skilled in the art can set it according to actual conditions. For example, the preheating water tank 20 can be rectangular, L-shaped, U-shaped, or U-shaped, designed according to the goal of maximizing space utilization and heat receiving area. This application does not limit this. Optionally, the portion of the preheating water tank 20 facing the outer wall of the washing chamber 10 is a curved surface or a flat surface that matches the shape of the outer wall of the washing chamber 10. This facilitates a close fit between the two, thereby enhancing the heat receiving effect.

[0020] Optionally, the first preset gap threshold is 0; and / or, the sidewall of the preheating water tank 20 facing the washing chamber 10 is completely attached to the outer wall of the washing chamber 10; and / or, the preheating water tank 20 is positioned with its outer wall surface with the largest area facing the washing chamber 10.

[0021] For example, Figure 2 This is a schematic diagram showing the relative positional relationship between a preheating water tank and a washing chamber, provided in an embodiment of this application. Figure 3 This is a schematic diagram showing the relative positional relationship between the preheating water tank and the washing chamber, provided in another embodiment of this application. Figure 4 This is a schematic diagram illustrating the relative positional relationship between the preheating water tank and the washing chamber, as provided in another embodiment of this application. See also... Figure 2 , Figure 3 and Figure 4 The gap between the preheating water tank 20 and the washing chamber 10 can be zero, thus reducing heat transfer loss between them. See also Figure 3 and Figure 4 The sidewall of the preheating water tank 20 facing the washing chamber 10 is completely fitted against the outer wall of the washing chamber 10, thus increasing the heat transfer area. See also Figure 4 The preheating water tank 20 is positioned with its largest outer wall facing the washing chamber 10, which increases the heat transfer area.

[0022] Regarding the volume of the preheating water tank 20, those skilled in the art can set it according to the washing water consumption of the dishwasher, and this application does not limit it in this regard. Optionally, considering that the preheating water tank 20 is mainly used to provide preheating water in the washing stage with low water demand (such as the hot rinsing stage), the volume of the preheating water tank 20 can be equal to the water demand of the washing stage with low water demand. In this way, the water demand of the washing stage with low water demand can be met, and the smaller water volume is also easier to be preheated to a higher temperature quickly.

[0023] Regarding the material of the preheating water tank 20, it can be made of a material with good thermal conductivity to facilitate the absorption of heat and its transfer to the water inside. Optionally, the preheating water tank 20 can be made entirely of metal (such as stainless steel, aluminum, or aluminum alloy), or the outer wall of the preheating water tank 20 facing the washing chamber 10 can be made of metal, while the other outer wall parts can be made of plastic.

[0024] Optionally, the dishwasher also includes a heat preservation shell, which is movably disposed around the preheating water tank 20 and connected to a drive mechanism (such as a motor, electromagnet, or spring mechanism). The controller 60 is electrically connected to the drive mechanism. Before the water in the preheating water tank 20 is preheated, the controller controls the drive mechanism to remove the heat preservation shell from the outer surface of the preheating water tank 20, exposing the outer surface of the preheating water tank 20 to prevent the heat preservation shell from obstructing heat transfer. After the water in the preheating water tank 20 is preheated, the controller controls the drive mechanism to cover the outer surface of the preheating water tank 20 with the heat preservation shell to reduce heat loss during the heat preservation stage.

[0025] Specifically, the water inlet pipe 30 can either introduce cold water from an external water source into the washing chamber 10, or it can introduce cold water from an external water source into the preheating water tank 20, and after preheating, it can be introduced into the washing chamber 10 from the preheating water tank 20.

[0026] Specifically, the fluid switching device 40, under the control of the controller 60, can selectively supply cold water from an external water source or preheated water stored in the preheated water tank 20 to the washing chamber 10. More specifically, the fluid switching device 40 has a first state and a second state. In the first state, the external water source is connected to the washing chamber 10, and the cold water supplied by the external water source directly enters the washing chamber 10. In the second state, the preheated water tank 20 is connected to the washing chamber 10, and the preheated water in the preheated water tank 20 enters the washing chamber 10. The fluid switching device 40 can be, for example, a three-way valve or a combination of two independent solenoid valves (one controlling the on / off of cold water output and the other controlling the on / off of preheated water output), but is not limited to these.

[0027] In some embodiments, see continue to see Figure 1The water inlet pipe 30 includes a first water inlet pipe 31, a second water inlet pipe 32, a third water inlet pipe 33, and a fourth water inlet pipe 34; The inlet end of the first water inlet pipe 31 is connected to an external water source, and the outlet end of the first water inlet pipe 31 is connected to the inlet end of the fluid switching device 40. The first water outlet of the fluid switching device 40 is connected to the water inlet of the second water inlet pipe 32, which is used to introduce cold water supplied by an external water source into the washing chamber 10. The second outlet of the fluid switching device 40 is connected to the inlet of the third inlet pipe 33, which is used to introduce cold water supplied by an external water source into the preheating water tank 20. The outlet of the preheating water tank 20 is connected to the inlet of the fourth inlet pipe 34, which is used to introduce the preheated water stored in the preheating water tank 20 into the washing chamber 10.

[0028] Specifically, the dishwasher also includes a breather 91 and a water softener 92. The breather 91 is used to regulate the air pressure balance inside the dishwasher and / or control the water inlet flow; the water softener 92 is used to remove calcium and magnesium ions from the water to reduce water hardness. Both the breather 91 and the water softener 92 are installed on the first water inlet pipe 31, for example, they can be connected in series in the first water inlet pipe 31 along the water flow direction.

[0029] Specifically, the dishwasher also includes a water tank, and the water inlet pipe 30 includes a ninth water inlet pipe 39. A first valve 94 can be installed on the second water inlet pipe 32, and a second valve 93 can be installed on the fourth water inlet pipe 34. In the first state, with the first valve 94 open, cold water supplied by an external water source flows out through the first water inlet pipe 31, then enters the water tank through the second water inlet pipe 32, and finally flows from the water tank into the washing chamber 10 through the ninth water inlet pipe 39. In the second state, with the second valve 93 closed, cold water supplied by an external water source flows out through the first water inlet pipe 31, then enters the preheating water tank 20 through the third water inlet pipe 33. After preheating, the cold water stored in the preheating water tank 20, when the second valve 93 is open, enters the water tank through the fourth water inlet pipe 34, and finally flows from the water tank into the washing chamber 10 through the ninth water inlet pipe 39. Of course, a water distribution valve 95 can also be installed on the ninth pipe to distribute the water flow to the water paths corresponding to different spray arms.

[0030] In other embodiments, Figure 5 This is a schematic diagram of another dishwasher provided in an embodiment of this application. Figure 6 This is a schematic diagram of the structure of another dishwasher provided in an embodiment of this application. See also... Figure 5 and Figure 6 The dishwasher includes a water tank, the interior of which is divided into a preheated water tank 20 and a cold water tank, the cold water tank being used to store cold water; The water inlet pipe 30 includes the fifth water inlet pipe 35, the sixth water inlet pipe 36, the seventh water inlet pipe 37, and the eighth water inlet pipe 38; The inlet end of the fifth inlet pipe 35 is connected to an external water source, the first outlet end of the fifth inlet pipe 35 is connected to the inlet end of the preheating water tank 20, and the second outlet end of the fifth inlet pipe 35 is connected to the inlet end of the cold water tank. The inlet end of the sixth water inlet pipe 36 is connected to the outlet end of the preheating water tank 20, and the outlet end of the sixth water inlet pipe 36 is connected to the first water inlet end of the fluid switching device 40. The inlet end of the seventh water inlet pipe 37 is connected to the outlet end of the cold water tank, and the outlet end of the seventh water inlet pipe 37 is connected to the second water inlet end of the fluid switching device 40. The outlet of the fluid switching device 40 is connected to the inlet of the eighth inlet pipe 38, which is used to introduce the preheated water in the preheated water tank 20 and the cold water in the cold water tank into the washing chamber 10.

[0031] Specifically, the dishwasher also includes a breather 91 and a water softener 92. The breather 91 is used to regulate the air pressure balance inside the dishwasher and / or control the water inlet flow; the water softener 92 is used to remove calcium and magnesium ions from the water to reduce water hardness. Both the breather 91 and the water softener 92 are installed on the fifth water inlet pipe 35, for example, they can be connected in series in the fifth water inlet pipe 35 along the water flow direction.

[0032] Specifically, the dishwasher also includes a sink, and the water inlet pipe 30 includes a ninth water inlet pipe 39. A third valve 95 can be installed on the eighth water inlet pipe 38.

[0033] Cold water supplied by an external water source flows out through the fifth inlet pipe 35 and enters the cold water tank and preheating water tank 20 for storage. The entry of cold water into the cold water tank and preheating water tank 20 can occur simultaneously in the same washing stage or separately in different washing stages. When separate water intake is required for different washing stages, a fourth valve (e.g., a diverter valve) is installed on the fifth inlet pipe 35. This fourth valve is electrically connected to the controller 60 and is used to selectively introduce cold water into the cold water tank or preheating water tank 20 under the control of the controller 60. In the first state, with the fluid switching device 40 in operation and the third valve 95 open, cold water in the cold water tank flows out through the seventh inlet pipe 37, then enters the water tank through the eighth inlet pipe 38, and finally enters the washing chamber 10 from the water tank through the ninth inlet pipe 39. After the cold water stored in the preheating water tank 20 is preheated, with the fluid switching device 40 in the second state and the third valve 95 closed, the preheated water in the preheating water tank 20 flows out through the sixth inlet pipe 36, then enters the water tank through the eighth inlet pipe 38, and finally flows from the water tank into the washing chamber 10 through the ninth inlet pipe 39. Of course, a water distribution valve 95 can also be installed on the ninth pipe to distribute the water flow to the water paths corresponding to different spray arms.

[0034] Understandably, the above-mentioned method of setting up the water inlet pipe 30 can simplify the water circuit structure of the water inlet pipe 30, reduce manufacturing costs, and meet the different needs of cold water or preheated water in different washing stages.

[0035] Specifically, in washing stages with high water demand (e.g., the main wash), the heater 50 can heat the cold water entering the washing chamber 10. Conversely, in washing stages with low water demand (e.g., the rinsing stage), if the preheated water in the preheating tank 20 has already reached a preset temperature (e.g., 40℃-50℃) before entering the washing chamber 10, it can directly enter the washing chamber 10 without being heated by the heater 50. If the preheated water in the preheating tank 20 has not reached the preset temperature before entering the washing chamber 10, it still needs to be heated by the heater 50 to the preset temperature before entering the washing chamber 10. For example, the heater 50 can be a heat pump, but it is not limited to this.

[0036] In some embodiments, the dishwasher also includes a drain pipe 80 for draining wastewater; The drain pipe 80 includes a first drain pipe for discharging hot wastewater. When the first drain pipe discharges hot wastewater, at least a portion of the first drain pipe transfers heat to the preheating water tank 20 to preheat the cold water stored in the preheating water tank 20.

[0037] Specifically, "at least a portion of the pipe section" refers to the portion of the first drain pipe that can transfer heat to the preheating water tank 20. Its length can be a part of the total length of the first drain pipe or the entire length.

[0038] Specifically, when hot water is injected into the washing chamber 10 to wash the dishes, the washing chamber 10 transfers heat to the preheating water tank 20, preheating the cold water stored in the preheating water tank 20 for the first time. The hot wastewater generated after washing is discharged through the first drain pipe. During the discharge of the hot wastewater through the first drain pipe, at least a portion of the first drain pipe transfers heat to the preheating water tank 20, preheating the cold water stored in the preheating water tank 20 for the second time. Thus, through two preheating processes, the overall utilization rate of heat is improved, thereby reducing the energy consumption of the heater 50 and achieving energy-saving effects.

[0039] Regarding the relative positional relationship between "at least a portion of the pipe section" and the preheating water tank 20, those skilled in the art can set it according to the actual situation, and no limitation is made here. Figure 7 This is a schematic diagram showing the relative positional relationship between at least a portion of the pipes of a preheating water tank and a first drain pipe, as provided in an embodiment of this application. Figure 8 This is a schematic diagram showing the relative positional relationship between at least a portion of the pipes of a preheating water tank and a first drain pipe, as provided in another embodiment of this application. Figure 9This is a schematic diagram showing the relative positions of at least a portion of the pipes of a preheating water tank and a first drain pipe, according to another embodiment of this application. See also: Figure 7 At least a portion of the first drain pipe has a gap less than a second preset gap threshold. This second preset gap can be any value between 2mm and 5mm. This ensures the gap between the preheating water tank 20 and at least a portion of the first drain pipe is not too large, preventing excessive heat loss during transfer and providing space for thermal expansion between the preheating water tank 20 and the washing chamber 10. Alternatively, a thermally conductive medium (such as thermally conductive adhesive) can be filled into the gap between the preheating water tank 20 and at least a portion of the first drain pipe to improve heat transfer efficiency. See another example. Figure 8 At least a portion of the first drain pipe is attached to the outer wall of the preheating water tank 20, meaning that at least a portion of the first drain pipe is in direct contact with the outer wall of the preheating water tank 20. This simplifies the structure and reduces manufacturing costs. See also [example of another example]. Figure 9 At least a portion of the first drain pipe is coiled around the outer wall of the preheating water tank 20. This coiling refers to the spiral arrangement of at least a portion of the first drain pipe around the outer wall of the preheating water tank 20. This creates a larger contact area between the first drain pipe and the preheating water tank 20, thereby increasing the heat transfer area. In another example, see... Figure 6 At least a portion of the first drain pipe is arranged in an S-shape around the bottom of the preheating water tank 20. The S-shape here refers to the fact that at least a portion of the first drain pipe bends back and forth on the bottom surface of the preheating water tank 20, forming a continuous curved shape similar to the English letter S. Adjacent bends are parallel to each other and extend in opposite directions. This increases the heat transfer area and helps to improve the temperature uniformity of the preheating water.

[0040] Regarding the material of the first drain pipe, it can be made of a material with good thermal conductivity to facilitate heat transfer to the preheating water tank 20. Optionally, the preheating water tank 20 can be made entirely of metal (such as stainless steel, aluminum, or aluminum alloy), or the section of the first drain pipe used for heat transfer can be made of metal, while the other parts can be made of plastic.

[0041] Optionally, the drain pipe 80 also includes a second drain pipe for discharging cold wastewater, and the distance between the preheating water tank 20 and the second drain pipe is greater than a preset distance threshold.

[0042] Specifically, the distance between the preheating water tank 20 and the second drain pipe refers to the shortest straight-line distance between the outer surface of the preheating water tank 20 and the outer surface of the second drain pipe.

[0043] Specifically, the specific value of the preset distance threshold can be set by those skilled in the art according to the actual situation, as long as it does not affect the cooling of the preheated water in the preheated water tank 20. Optionally, the preset distance threshold is greater than 20mm, but it is not limited to this.

[0044] Specifically, a water tank can be installed below the washing chamber 10. A sixth valve is installed on the first drain pipe, and a seventh valve is installed on the second drain pipe. The inlet of the water tank is connected to the drain outlet of the washing chamber 10, the first outlet of the water tank is connected to the inlet of the first drain pipe, and the second outlet of the water tank is connected to the inlet of the second drain pipe. When the washing chamber 10 discharges high-temperature wastewater during a washing stage using hot water (e.g., the main wash stage), the hot wastewater first flows into the water tank, the sixth valve opens and the seventh valve closes, and then flows from the first outlet of the water tank into the first drain pipe, and is discharged through the first drain pipe. During the discharge of wastewater through the first drain pipe, at least a portion of the first drain pipe transfers heat to the preheating water tank 20 to preheat the cold water in the preheating water tank 20. When the washing chamber 10 discharges cold wastewater during a washing stage using cold water (e.g., the pre-wash stage or the cold rinse stage), the cold wastewater first flows into the water tank, the sixth valve closes and the seventh valve opens, and then flows from the second outlet of the water tank into the second drain pipe, and is discharged through the second drain pipe.

[0045] It is understandable that by setting up the first drain pipe and the second drain pipe separately, hot wastewater and cold wastewater can be discharged separately, thus preventing the cold wastewater from cooling the preheated water in the preheated water tank 20.

[0046] Specifically, the controller 60 can precisely control the fluid switching device 40 based on whether the required water volume is greater than the preset water volume threshold, thus strictly achieving physical path isolation between cold water and preheated water.

[0047] Specifically, the preset water volume threshold is equal to or close to the volume of preheated water in the preheated water tank 20 (for example, the preset water volume threshold is 80% to 100% of the preheated water volume).

[0048] Specifically, the preheating tank 20 can be filled with cold water each time, so the amount of preheated water is equal to the volume of the preheating tank 20. Of course, the dishwasher may also include a water level sensor, with the controller 60 electrically connected to the water level sensor to obtain real-time water level information in the preheating tank 20 and calculate the amount of preheated water in the preheating tank 20 based on the water level information. However, it is not limited to this.

[0049] Specifically, if the water demand of the current washing stage exceeds the preset water threshold, it indicates that the current washing stage is a high-water-demand stage, and the preheated water in the preheating tank 20 is insufficient to meet the water demand of the current washing stage. At this time, the controller 60 controls the fluid switching device 40 to switch to the first state, supplying cold water to the washing chamber 10 after heating by the heater 50, instead of mixing the preheated water in the preheating tank 20 with the cold water before supplying it to the washing chamber 10. In this case, if... Figure 1 In the illustrated embodiment, the first state connects an external water source to the washing chamber, allowing cold water from the external water source to flow directly into the washing chamber; in such a state... Figure 5 and Figure 6 In the illustrated embodiment, the first state connects the cold water tank and the washing chamber, allowing pre-stored cold water (supplied by an external water source) to flow into the washing chamber. This avoids a sudden drop in water temperature caused by the mixing of hot and cold water, ensuring that the temperature and volume of the preheated water are effectively maintained for use in subsequent washing stages with lower water demand, thereby maximizing the energy-saving benefits of the preheated water.

[0050] Specifically, at the start of the main wash phase, the fluid switching device is first switched to the first state, allowing cold water to enter the washing chamber. Since the water flow is not yet stable at this time, immediately starting the heater could lead to partial dry burning or low heat exchange efficiency. Therefore, after switching to the first state, the heater is not started immediately, but waits for a first preset time before starting. The first preset time is the time required for sufficient water to enter the washing chamber and for the water circulation to stabilize. Those skilled in the art can set this time according to actual conditions. For example, based on actual testing, the first preset time can be any value between 1 and 2 minutes, but it is not limited to this, as long as it is sufficient to prevent the heater from starting in a waterless or unstable water flow state. This application does not impose any limitations on this.

[0051] Specifically, if the water demand of the current washing stage is less than or equal to the preset water threshold, it indicates that the current washing stage is a low-water-demand stage, and the preheated water in the preheating tank 20 is sufficient to meet the water demand of the current washing stage. At this time, the controller 60 controls the fluid switching device 40 to switch to the second state, connecting the preheating tank and the washing chamber. Preheated water is supplied to the washing chamber 10 either directly or after being heated by heater 50 (when the temperature of the preheated water has not reached the preset temperature). In this way, the preheated water is introduced into the washing chamber 10 for washing with 100% unmixed cold water. Since the preheated water is hot and undiluted, no additional heating is required or the energy required for additional heating is minimal, which significantly reduces the energy consumption of this washing stage.

[0052] Specifically, during the dishwasher's washing program, when cold water is being used in the current washing stage, the fluid switching device is switched to its first state to allow cold water from an external water source to flow into the washing chamber. In this case, such as... Figure 1 In the illustrated embodiment, the first state connects an external water source to the washing chamber, allowing cold water from the external water source to flow directly into the washing chamber; in such a state... Figure 5 and Figure 6 In the illustrated embodiment, the first state connects the cold water tank and the washing chamber, so that the cold water pre-stored in the cold water tank (provided by an external water source) flows into the washing chamber.

[0053] In some embodiments, the washing program includes multiple washing stages, and the water consumption information for each washing stage can be preset within the controller 60. Thus, the controller 60 is configured to query the water consumption information to determine the water demand for the current washing stage and compare it with a preset water consumption threshold. Optionally, the dishwasher may also include a flow sensor located at the water inlet of the washing chamber 10 to monitor the amount of water entering the washing chamber 10 in real time. The controller 60 is electrically connected to the flow sensor and calibrates the water consumption information for each washing stage based on the detection signal from the flow sensor.

[0054] In other embodiments, the controller 60 can preset the relationship between the required water volume and a preset water volume threshold for each washing stage. For example, the washing program includes a pre-wash stage, a main wash stage, a cold rinse stage, a hot rinse stage, and a drying stage, which are performed sequentially. The main wash stage and the hot rinse stage use hot water, while the pre-wash stage and the cold rinse stage use cold water. When determining whether the required water volume for the current washing stage is greater than the preset water volume threshold, the controller 60 is specifically configured as follows: if the current washing stage is the main wash stage, determine that the required water volume is greater than the preset water volume threshold; if the current washing stage is the hot rinse stage, determine that the required water volume is less than or equal to the preset water volume threshold. In this way, it is possible to quickly determine whether the required water volume for the current washing stage is greater than the preset water volume threshold.

[0055] Specifically, in the pre-wash stage, cold water is used to rinse the surface of the dishes to remove larger food scraps and loose stains, preparing them for the main wash stage. In the main wash stage, hot water and detergent work together to remove grease and stubborn stains; this stage requires a larger water volume. In the cold rinse stage, cold water is used to rinse the dishes to remove residual detergent and loose stains. In the hot rinse stage, hot water is used for a final rinse, killing bacteria and improving the shine of the dishes; this stage requires a smaller water volume. The drying stage primarily aims to remove surface moisture from the dishes, allowing them to dry completely.

[0056] Optionally, the controller 60 is also configured to fill the preheated water tank 20 during the drying phase, during the last execution of the dishwasher's washing program.

[0057] For example, see Figure 1 During the washing program of the dishwasher, in the drying stage, the controller 60 controls the fluid switching device 40 to switch to the first state, controls the first valve 94 to close, and controls the second valve 93 to close, thereby realizing the injection of water into the preheating water tank 20.

[0058] For example, see Figure 5 and Figure 6 During the previous dishwasher wash cycle, in the drying phase, controller 60 controlled the fourth valve ( Figure 5 , Figure 6 (Not shown) Switch to the water inlet passage of the preheating water tank 20, thereby realizing the injection of water into the preheating water tank 20.

[0059] Specifically, the drying stage is the last washing stage in the washing program and does not require water. Therefore, during the drying stage of the previous washing program, cold water can be added to the preheating water tank 20 in advance. This way, it will not affect the normal operation of the current washing program, nor will it require additional time to add water to the preheating water tank 20, thus not extending the overall washing program time of the dishwasher.

[0060] Figure 10 This is a flowchart illustrating a dishwasher control method provided in an embodiment of this application. See also... Figure 10 The method includes the following steps: S1010. During the execution of the dishwasher's washing program, if hot water is used in the current washing stage, determine whether the water demand for the current washing stage is greater than the preset water threshold. The preset water threshold is determined based on the amount of preheated hot water in the preheating tank.

[0061] S1020. If the required water volume is greater than the preset water volume threshold, the fluid switching device is switched to the first state, and after a first preset time, the heater is started to run so that the cold water provided by the external water source is heated into hot water and enters the washing chamber.

[0062] S1030 If the required water volume is less than or equal to the preset water volume threshold, the control fluid switching device switches to the second state so that the preheated water stored in the preheated water tank enters the washing chamber.

[0063] Optionally, the method further includes: during the drying phase of the previous dishwasher wash cycle, adding water to the preheated water tank.

[0064] It should be noted that the above method embodiments can be implemented by the controller in the dishwasher embodiments by executing the corresponding control steps. Therefore, the method embodiments have the same technical effects as the dishwasher embodiments, and will not be described again here.

[0065] In summary, the dishwasher and its control method provided in this application have the following advantages: 1. Improved energy efficiency: In the washing stage with low water demand using hot water, 100% undiluted high-temperature preheated water is used, completely avoiding temperature drops caused by mixing with cold water, significantly reducing or even eliminating the energy consumption demand for the heater in this stage, and directly utilizing the residual heat from the main wash; by avoiding the waste of preheated water being diluted by cold water in the main wash stage, the overall energy consumption of the washing program is significantly reduced. 2. Cost and compatibility advantages: Compared with multi-tank solutions, the single-tank structure achieves isolation of hot and cold water paths, saving space and reducing manufacturing costs and complexity; it is also easier to adapt to existing single-tank dishwasher platforms for upgrades and modifications. 3. Reliability: It ensures that the water temperature is stable and sufficiently high in the washing stage with low water demand using hot water (due to the use of undiluted preheated water), improving the consistency of cleaning and rinsing effects; it avoids temperature fluctuations that may be caused by mixing hot and cold water, making the system operation more stable.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0067] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A dishwasher, characterized in that, include: The washing chamber is used to hold dishes to be washed. A preheating water tank is provided, wherein the water tank and the washing chamber are arranged adjacent to each other and the gap between the water tank and the washing chamber is less than or equal to a first preset gap threshold. When hot water is injected into the washing chamber to wash the tableware to be washed, the washing chamber transfers heat to the preheating water tank to preheat the cold water stored in the preheating water tank. The water inlet pipe is used to introduce cold water supplied by an external water source into the preheating water tank and the washing chamber, and also to introduce preheated water stored in the preheating water tank into the washing chamber; A fluid switching device is used to supply cold water provided by an external water source to the washing chamber through the water inlet pipe when in the first state, and is also used to supply preheated water stored in the preheated water tank to the washing chamber through the water inlet pipe when in the second state. A heater is used to heat the cold water entering the washing chamber; The controller is configured as follows: During the execution of the dishwasher's washing program, if hot water is used in the current washing stage, it is determined whether the water demand of the current washing stage is greater than a preset water threshold, wherein the preset water threshold is determined based on the amount of preheated hot water in the preheating tank. If the required water volume is greater than the preset water volume threshold, the fluid switching device is controlled to switch to the first state, and after a first preset time, the heater is controlled to start running so that the cold water provided by the external water source is heated into hot water and enters the washing chamber. If the required water volume is less than or equal to the preset water volume threshold, the fluid switching device is controlled to switch to the second state so that the preheated water stored in the preheated water tank enters the washing chamber.

2. The dishwasher according to claim 1, characterized in that, The first preset gap threshold is 0; And / or, the sidewall of the preheating water tank facing the washing chamber is completely attached to the outer wall of the washing chamber; And / or, the preheating water tank is positioned with its largest outer wall surface facing the washing chamber.

3. The dishwasher according to claim 1, characterized in that, The water inlet pipe includes a first water inlet pipe, a second water inlet pipe, a third water inlet pipe, and a fourth water inlet pipe; The inlet end of the first water inlet pipe is connected to the external water source, and the outlet end of the first water inlet pipe is connected to the inlet end of the fluid switching device. The first water outlet of the fluid switching device is connected to the water inlet of the second water inlet pipe, and the second water inlet pipe is used to introduce cold water provided by the external water source into the washing chamber. The second outlet of the fluid switching device is connected to the inlet of the third inlet pipe, which is used to introduce cold water provided by the external water source into the preheating water tank. The outlet of the preheating water tank is connected to the inlet of the fourth inlet pipe, which is used to introduce the preheated water stored in the preheating water tank into the washing chamber.

4. The dishwasher according to claim 1, characterized in that, The dishwasher includes a water tank, the interior of which is divided into a preheated water tank and a cold water tank, the cold water tank being used to store cold water. The water inlet pipes include a fifth water inlet pipe, a sixth water inlet pipe, a seventh water inlet pipe, and an eighth water inlet pipe; The inlet end of the fifth water inlet pipe is connected to the external water source, the first outlet end of the fifth water inlet pipe is connected to the inlet end of the preheating water tank, and the second outlet end of the fifth water inlet pipe is connected to the inlet end of the cold water tank. The inlet end of the sixth water inlet pipe is connected to the outlet end of the preheating water tank, and the outlet end of the sixth water inlet pipe is connected to the first water inlet end of the fluid switching device. The inlet end of the seventh water inlet pipe is connected to the outlet end of the cold water tank, and the outlet end of the seventh water inlet pipe is connected to the second water inlet end of the fluid switching device. The outlet of the fluid switching device is connected to the inlet of the eighth inlet pipe, which is used to introduce preheated water from the preheated water tank and cold water from the cold water tank into the washing chamber.

5. The dishwasher according to claim 1, characterized in that, The dishwasher also includes a drain pipe for draining wastewater; The drain pipe includes a first drain pipe for discharging hot wastewater. When the first drain pipe discharges hot wastewater, at least a portion of the first drain pipe transfers heat to the preheating water tank to preheat the cold water stored in the preheating water tank.

6. The dishwasher according to claim 5, characterized in that, At least a portion of the first drain pipe is coiled around the outer wall of the preheated water tank; Alternatively, at least a portion of the first drain pipe is attached to the outer wall of the preheated water tank; Alternatively, at least a portion of the first drain pipe may be S-shaped and encircle the bottom of the preheated water tank. Alternatively, at least a portion of the first drain pipe has a gap with the preheated water tank that is less than a second preset gap threshold.

7. The dishwasher according to claim 5, characterized in that, The drain pipe also includes a second drain pipe for discharging cold wastewater, and the distance between the preheating water tank and the second drain pipe is greater than a preset distance threshold.

8. The dishwasher according to claim 1, characterized in that, The washing program includes a pre-wash stage, a main wash stage, a cold rinse stage, a hot rinse stage, and a drying stage, which are performed sequentially. The main wash stage and the hot rinse stage use hot water, while the pre-wash stage and the cold rinse stage use cold water. When determining whether the water demand of the current washing stage is greater than a preset water threshold, the controller is specifically configured as follows: If the current washing stage is the main washing stage, it is determined that the required water volume is greater than the preset water volume threshold. If the current washing stage is the hot rinsing stage, the required water volume is determined to be less than or equal to the preset water volume threshold.

9. The dishwasher according to claim 8, characterized in that, The controller is also configured to: During the previous washing cycle of the dishwasher, water was added to the preheating tank during the drying phase.

10. A method for controlling a dishwasher, characterized in that, Applied to the dishwasher according to any one of claims 1-9, wherein the method comprises: During the execution of the dishwasher's washing program, if hot water is used in the current washing stage, it is determined whether the water demand of the current washing stage is greater than a preset water threshold, wherein the preset water threshold is determined based on the amount of preheated hot water in the preheating tank. If the required water volume is greater than the preset water volume threshold, the fluid switching device is controlled to switch to the first state, and after a first preset time, the heater is controlled to start running so that the cold water provided by the external water source is heated into hot water and enters the washing chamber. If the required water volume is less than or equal to the preset water volume threshold, the fluid switching device is controlled to switch to the second state so that the preheated water stored in the preheated water tank enters the washing chamber.

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