Dishwasher with energy recovery system

Abstract

A dishwasher (100) configured to include features for facilitating its cleaning and maintenance and / or improving its power efficiency. The dishwasher can include a wastewater heat recovery system and / or a steam heat recovery system. The wastewater heat recovery system can include a wastewater heat exchange coil (363) configured to be removably placed in a wastewater tank (109) of the dishwasher to heat clean water using thermal energy from wastewater and facilitate cleaning of itself and the wastewater tank. The wastewater heat recovery system can include a steam heat exchange coil having a clean water inlet, a clean water outlet, and a plurality of loops, each loop directly connected between the clean water inlet (873) and the clean water outlet (874) to heat the clean water using thermal energy from the steam, and the pressure in the hydraulic system of the dish washing machine is not obviously reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates generally to warewashing, and more particularly, to a washing machine, such as a dishwasher, including an energy recovery system to improve energy efficiency by using high temperature wastewater and / or steam to heat cleaning water. BACKGROUND

[0002] A dishwasher, also known as a warewashing machine or warewasher, is a machine used to automatically clean items such as dishes, trays, laboratory equipment, cutlery, and kitchen utensils. A batch of items to be cleaned (e.g., dishes) can be loaded into the dishwasher to be cleaned in a cleaning cycle that includes a wash cycle and a rinse cycle. During the wash cycle, a wash liquor including water and detergent is sprayed into the loaded dishwasher to jet the dishes. The wash liquor is then drained prior to the start of the rinse cycle. During the rinse cycle, a rinse liquor including water or a mixture of water and rinse agent is sprayed into the loaded dishwasher to remove residue of the wash liquor. After the rinse cycle is complete and the rinse liquor is drained, the dishes can optionally be dried using air and / or heat during a drying cycle. The dishwasher can have various user-selectable settings for each cleaning cycle. These settings can define, for example, the time, temperature, and repetition of each of the wash, rinse, and dry cycles. These settings can also allow the user to select which cycles to include (e.g., rinse only, dry only, rinse and dry, or wash and rinse without drying).

[0003] A common household dishwasher is a countertop unit intended to be installed under a kitchen counter. Other types of dishwashers include industrial or commercial dishwashers used in restaurants, hotels, and other commercial establishments having a food service. High temperatures can be used during the wash cycle, rinse cycle, and dry cycle to achieve a desired cleaning and / or sanitizing effect. As a result, a significant amount of high temperature wastewater and high temperature steam can be generated by operating a dishwasher, particularly when the dishwasher is intended for commercial use that requires cleaning and sanitizing of a large number of dishes and / or other items by repeating a cleaning cycle in a limited amount of time. SUMMARY

[0004] A dishwasher configured to include features for facilitating its cleaning and maintenance and / or improving its power efficiency. The dishwasher can include a wastewater heat recovery system and / or a steam heat recovery system. The wastewater heat recovery system can include a wastewater heat exchange coil configured to be removably placed in a wastewater tank of the dishwasher to use heat energy from the wastewater to heat clean water and facilitate cleaning of the wastewater tank and the wastewater heat exchange coil. The wastewater heat recovery system can include a steam heat exchange coil having a clean water inlet, a clean water outlet, and a plurality of loops, each loop being directly connected between the clean water inlet and the clean water outlet to use heat energy from the steam to heat clean water without significantly reducing pressure in the hydraulic system of the dishwasher.

[0005] In one example, a dishwasher can be configured to perform a cleaning cycle, each cleaning cycle including a wash cycle and a rinse cycle for cleaning objects. The dishwasher can include a washing chamber, a wash tank, a wastewater tank, and a wastewater heat exchange coil. The washing chamber can be configured to hold objects. The wash tank can be configured to accommodate detergent to be sprayed into the washing chamber during the wash cycle, receive return liquid to be added to the detergent from the wash chamber, and release a portion of the detergent when the detergent level in the wash tank exceeds a threshold level. The wastewater tank can be configured to receive wastewater from the wash tank and release the received wastewater to a drain. The wastewater includes a portion of the detergent released from the wash tank. The wastewater heat exchange coil can be configured to be detachably placed in the wastewater tank and transfer heat energy from the wastewater to heat clean water. The wastewater heat exchange coil has a clean water inlet for receiving clean water and a clean water outlet for outputting the heated clean water.

[0006] In one example, a dishwasher is provided that is configured to perform a cleaning cycle, each cleaning cycle including a wash cycle and a rinse cycle for cleaning objects. The dishwasher may include a washing chamber and a steam reduction module. The washing chamber may be configured to hold objects and allow the objects to be washed during the wash cycle and rinsed during the rinse cycle. The steam reduction module may include a crossflow fan and a condenser. The fan may be configured to draw steam from the washing chamber and blow the remaining steam out of the dishwasher. The condenser may be placed in the path of the steam between the washing chamber and the fan and configured to condense the steam drawn into the steam reduction module into remaining steam while heating clean water. The condenser may include a clean water inlet for receiving clean water; a clean water outlet for outputting heated clean water; and a steam heat exchange coil comprising a plurality of loops, each loop being directly connected to the clean water inlet to receive a portion of the received clean water and directly connected to the clean water outlet to output a portion of the heated clean water.

[0007] In one example, a method for operating a dishwasher is provided. The dishwasher is configured to perform cleaning cycles, each cleaning cycle including a wash cycle and a rinse cycle for cleaning objects. The method may include: receiving a portion of the washing liquid from a wash tank containing the washing liquid; spraying the received portion of the washing liquid into a washing chamber loaded with the objects during the wash cycle; collecting liquid from the washing chamber and returning the collected liquid to the wash tank to be added to the washing liquid; transferring excess washing liquid from the wash tank to a wastewater tank as wastewater, the excess washing liquid being generated when the level of washing liquid in the wash tank exceeds a threshold level; transferring heat energy from the wastewater to clean water flowing through a wastewater heat exchange coil detachably disposed in the wastewater tank to heat the clean water; and transferring the wastewater from the wastewater tank to a drain.

[0008] In one example, a method for operating a dishwasher is provided. The dishwasher is configured to perform cleaning cycles, each cleaning cycle including a wash cycle and a rinse cycle for cleaning objects. The method may include holding objects in a washing chamber; washing the objects during the wash cycle; rinsing the objects during the rinse cycle; drawing steam from the washing chamber during each cleaning cycle; condensing the steam while heating additional cleaning water using a steam heat exchange coil, the steam heat exchange coil including a plurality of loops, each loop directly connected to an additional cleaning water inlet for receiving a portion of the additional cleaning water and directly connected to an additional cleaning water outlet for outputting a portion of the heated additional cleaning water; and blowing the remaining steam after condensation out of the dishwasher.

[0009] In various examples, the subject matter of any one or any combination of the examples discussed above can be implemented in a dishwasher and / or performed to operate a dishwasher.

[0010] This summary is an overview of some of the teachings of this application and is not an exclusive or exhaustive discussion of the subject matter. Further details about this subject matter are provided in the detailed description and the appended claims. The scope of the invention is defined by the appended claims and their legal equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings generally illustrate various embodiments discussed in the present disclosure by way of example. The drawings are for illustration purposes only and may not be drawn to scale.

[0012] Figure 1A 、 Figure 1B 、 Figure 1C and Figure 1D is a diagram of an embodiment of a dishwasher, Figure 1A shows a front view, Figure 1B shows a side view of the dishwasher with the hood closed, Figure 1C shows a side view with the hood open, and Figure 1D A top view is shown.

[0013] Figure 2 is an illustration of an embodiment of a dishwasher with example accessories.

[0014] Figure 3 is a diagrammatic representation of an embodiment of a hydraulic system for a dishwasher.

[0015] Figure 4 is a perspective view illustration of an embodiment of an arrangement of components in a portion of a dishwasher.

[0016] Figure 5 is a cross-sectional illustration of an embodiment of an arrangement of components in a portion of a dishwasher.

[0017] Figure 6 is a diagrammatic representation of an embodiment of a wastewater heat recovery module for a dishwasher.

[0018] Figure 7 is a diagrammatic representation of an embodiment of parts of a waste water recirculation system for a dishwasher.

[0019] Figure 8 is a diagrammatic representation of an embodiment of parts of a hydraulic system of a dishwasher for wastewater recirculation.

[0020] Figure 9 is a diagrammatic representation of an embodiment of a wash tank drain assembly in a wastewater recirculation system.

[0021] Figure 10 is a diagrammatic representation of an embodiment of a wastewater heat recovery module placed in the wastewater tank of a dishwasher.

[0022] Figure 11 is a diagram of an embodiment of portions of a dishwasher showing air and steam flow during operation.

[0023] Figure 12 is a diagram of an embodiment of portions of a dishwasher, showing a steam reduction module.

[0024] Figure 13 is a diagram of an embodiment of portions of a steam reduction module showing steam flow and clean water flow for steam heat recovery.

[0025] Figure 14 is an illustration of an embodiment of portions of a vapor reduction module including a room air funnel and an air inlet.

[0026] Figure 15 is a diagram of an embodiment of a steam heat exchange coil of a steam reduction module. DETAILED DESCRIPTION

[0027] The following detailed description of the present subject matter refers to the subject matter in the accompanying drawings, which illustrate, by way of illustration, specific aspects and embodiments in which the present subject matter may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present subject matter. References in this disclosure to "one," "an," or "various" embodiments are not necessarily references to the same embodiment, and such references contemplate multiple embodiments. The scope of the invention is defined by the appended claims and the full scope of legal equivalents to which such claims are entitled.

[0028] The present invention relates to a method and apparatus for dispensing one or more dishwashing detergents in a dishwasher and controlling the dispensing using a temperature sensed from the dishwasher. As used herein, a "dishwasher" (also referred to as a dishwashing machine, utensil washer, or dishwashing machine) may include any type of washing machine that can use detergents for cleaning and / or disinfecting purposes in a home or commercial setting. Objects to be washed in a dishwasher may include cutlery, flatware, pots and pans, knives, flatware, glasses, kitchen utensils, dinner plates, trays, and the like. Such objects may be placed in a dishwasher rack in the dishwasher. A "dishwasher rack" (also referred to as a dishwashing rack) may include any rack used in a dishwasher for holding any object to be washed. Unless otherwise specified, a "rack" in this disclosure refers to a dishwasher rack. A rack may be a built-in component of a dishwasher or a removable accessory suitable for a dishwasher. The rack may be a peg rack or an open rack and may have any size and shape suitable for a dishwasher. Each dishwasher may include one or more built-in racks and / or may accommodate one or more removable racks.

[0029] As used in the present disclosure, the "cleaning cycle" of a dishwasher can include various operating cycles, such as one or more of a descaling cycle, a wash cycle, a rinse cycle, and a drying cycle, depending on the availability of the corresponding operating mode in the dishwasher and the settings input by the user of the dishwasher. "Cleaning" can include only cleaning, only disinfection, cleaning and disinfection, descaling and cleaning, or descaling, cleaning, and disinfection. A "descaling cycle" includes a cycle or operating mode in which a descaling solution formed by water and a descaling agent is applied to the object being cleaned. A "wash cycle" includes a cycle or operating mode in which a washing solution formed by water and a detergent is applied to the object being washed. A "rinsing cycle" includes a cycle or operating mode in which water or a rinsing solution formed by water and a rinse aid and / or disinfectant is applied to the object being cleaned. Some dishwashers (e.g., commercial dishwashers) can include a rinse cycle that is primarily used to disinfect by heat and / or chemical means. Descaling agents, detergents, rinse aids, and disinfectants can each be a chemical reagent or a mixture of chemical reagents in liquid or solid form. "Drying cycle" includes a cycle or mode of operation intended for drying cleaned objects by air flow and / or heat without the application of additional water and / or chemicals.

[0030] The trend towards franchised food service establishments has created a need to miniaturize storage while maximizing storage area utilization and diversifying kitchen equipment. Stores (e.g., restaurants) may face the challenge of increasing the use of electric appliances without increasing the capacity of existing power systems. The power available to operate dishwashers (electrical appliances typically used in restaurants or other food service establishments) may be limited, but the cleaning effectiveness of the dishwashers will not be compromised. Therefore, there is a need to minimize the space required to house the dishwashers and the space required for on-site maintenance and repair of the dishwashers, and to improve the power efficiency of the dishwashers while ensuring the effectiveness of cleaning and disinfection, for example, to meet or exceed the sanitation requirements of operating food service establishments.

[0031] Figure 1A 、 Figure 1B 、 Figure 1C and Figure 1D is a diagram of an embodiment of a dishwasher 100. Figures 1A to 1DAs shown and discussed as an example for purposes of illustration and not limitation, dishwasher 100 is a hood-type dishwasher that includes a hood 102 to cover a wash chamber (also referred to as a main wash chamber) 101 during each cleaning cycle. A hood lift handle 103 can be lifted by a user to open hood 102 for loading objects to be washed into wash chamber 101 before the cleaning cycle, lowered by the user to close hood 102 to cover wash chamber 101 before starting the cleaning cycle, and lifted by the user to open hood 102 for unloading cleaned objects after the cleaning cycle is complete. A hood lock 104 mounted on hood 102 automatically locks at the start of a cleaning cycle to prevent hood 102 from being accidentally opened during the cleaning cycle. Figure 1A A front view of the dishwasher 100 is shown when the hood 102 is closed. Figure 1B A side view of the dishwasher 100 is shown when the hood 102 is closed. Figure 1C A side view of the dishwasher 100 is shown when the hood 102 is open. Figure 1D A top view of dishwasher 100 is shown.

[0032] Dishwasher 100 includes a dispenser 105 that holds various chemicals for dispensing during different periods of a cleaning cycle. Each chemical can be in liquid or solid form, and dispenser 105 is configured to hold the liquid and / or solid form of each chemical, depending on the form of the chemical available and intended for use. Each chemical in dispenser 105 is refillable. In one example, dishwasher 100 can perform a cleaning cycle including a descaling cycle, a wash cycle, and a rinse cycle, and dispenser 105 is an integrated dispenser that can hold descaling agent, detergent, and rinse aid, and can dispense descaling agent for use during the descaling cycle, detergent for use during the wash cycle, and rinse aid for use during the rinse cycle.

[0033] The dishwasher 100 includes a user interface 106 that visually and / or audibly indicates its operating status and allows the user to control its operation. The user interface 106 may include a display screen, such as a touch screen, that can display the operating status of the dishwasher 100 and receive commands and other information from the user. The user interface 106 may include a power switch for the user to turn the dishwasher 100 on and off. The user interface 106 allows the user to start a cleaning cycle, optionally after indicating to the user that the cleaning cycle is ready to begin (e.g., after closing the hood 102). In one example, the user interface 106 allows the user to select which cycles to include in the cleaning cycle. For example, when the dishes are known to be clean but need to be sanitized, the user can select only the rinse cycle. The user can select the wash cycle and rinse cycle only when no indication is given that the dishes need to be descaled. In another example, the user interface 106 is configured (e.g., programmed) to follow sanitation procedures and / or comply with regulations for ensuring food safety.

[0034] The dishwasher 100 has a main frame (e.g., a welded metal structure) and a top structure attached to the main frame. The top structure provides a roof for the washing chamber 101 and does not move with the hood 102. The hood 102 has a three-panel structure with a front panel and two side panels, without a top panel or roof. Components such as the dispenser 105 and the user interface 106 are placed on the top structure and do not move with the hood 102. Allowing components to be positioned above the washing chamber 101 without moving with the hood 102 saves space, while the hood 102 can be made light and therefore easy to lift.

[0035] Dishwasher 100 provides high space and power efficiency to reduce operating costs and / or allow food service organizations to operate under limited space and / or power capacity. For example, dishwasher 100 includes an internal wastewater recycling system 107 and an internal steam reduction module 111 to recycle the heat energy generated by operation during each cleaning cycle for heating the clean water to be used in operation. Wastewater recycling system 107 includes: a washing tank (also referred to as a main washing tank) 108 and a wastewater tank 109 (also referred to as an overflow tank), which recirculates the hot washing liquid to be sprayed into and returned from the washing chamber 101 during the wash cycle, and the wastewater tank is used to receive excess hot washing liquid as wastewater from washing tank 108. A heat exchange module is placed in wastewater tank 109 to cool the wastewater before it is discharged into a drain pipe (for example, a drain pipe connected to a building's sewer). As needed, heated clean water is added to washing tank 108 and booster tank (also referred to as rinse tank) 110. In the illustrated example, the boost tank 110 receives clean water and a descaling agent to form a descaling solution to be sprayed into the washing chamber 101 during the descaling cycle, and receives clean water and a rinse aid to form a rinse solution to be sprayed into the washing chamber 101 during the rinse cycle. The steam reduction module 111 includes a fan 112 for drawing steam from the washing chamber 101 and a condenser 113 positioned in the steam passage to condense the steam while heating the clean water (in addition to recovering heat from the waste water). The fan 112 blows the remaining steam out of the dishwasher 100.

[0036] The dishwasher 100 can be sized to allow for easy operation and maintenance by users 150 cm or taller. The force required to open the hood 102 by lifting the hood lift handle 103 can be approximately 3.5 kg or less. In one example, the wash tank 108 has a capacity of approximately 24 L, the wastewater tank 108 has a capacity of approximately 12 L, and the boost tank 110 has a capacity of approximately 10 L.

[0037] Figure 2 is a diagram of an embodiment of a dishwasher 100 having several accessories. Figure 2As shown, by way of example and not limitation, the accessories may include a dirty dish rack 220, a clean dish rack 223, a dishwasher rack 224, and an exhaust hood 225. The dirty dish rack 220 includes one or more sinks 221 and one or more faucets 222. When necessary or convenient, dishes and / or other objects to be cleaned can be placed in the sink 221 and pre-washed using water from the faucet 222 before being loaded into the washing chamber 101 (with the hood 102 open). When the washing chamber 101 is empty, a rack 224 can be placed in the washing chamber, and for each cleaning cycle, dishes and / or other objects can be placed into the rack 224. After the cleaning cycle is complete, the rack 224 loaded with cleaned dishes and / or other objects can be removed from the washing chamber 101 (with the hood 102 open) and placed on the clean dish rack 223 before use and / or further distribution. The exhaust hood 225 may discharge steam blown from the dishwasher 100 by the fan 112 to the outside of a building where the dishwasher 100 is placed.

[0038] Figure 3 is a diagram of an embodiment of a hydraulic system 329 of a dishwasher 100. Figure 2 As shown, by way of example for purposes of illustration and not limitation, the hydraulic system 329 may support liquid movement functions during a descaling cycle, a wash cycle, and a rinse cycle.

[0039] The hydraulic system 329 includes a main water valve 335 (e.g., a solenoid-controlled valve) that can be opened to receive clean water from a water source (e.g., a building's water main). The clean water can be heated in the wastewater tank 109 and then directed to the wash tank 108 and the booster tank 110. When needed (e.g., for dissolving one or more solid chemical reagents), the clean water can also be directed to the dispenser 105 through the dispenser valve 336.

[0040] During the descaling cycle, the descaling agent is dispensed from the dispenser 105 into the booster tank 110 to form a descaling liquid with the heated clean water in the booster tank 110. The descaling liquid is pumped to the rinse arm 330 by the rinse pump 333. The rinse arm 330 is positioned above and below the washing chamber 101 and rotates to spray the descaling liquid from above and below into the washing chamber 101. After passing through the washing chamber 101, the descaling liquid flows into the wash tank 108.

[0041] During the wash cycle, detergent is dispensed from the dispenser 105 into the wash tank 108 to form a wash liquid with the heated clean water in the wash tank 108. The wash liquid is pumped to the wash arms 332 by the wash pump 331. The wash arms 332 are positioned above and below the wash chamber 101 and rotate to spray the wash liquid from above and below into the wash chamber 101. The wash liquid returns to the wash tank 108 after passing through the wash chamber 101.

[0042] During the rinse cycle, rinse aid is dispensed from the dispenser 105 into the booster tank 110 to form a rinse liquid with the heated clean water in the booster tank 110. The rinse liquid is pumped to the rinse arm 330 by the rinse pump 333. The rinse arm 330 is rotated to spray the rinse liquid from above and below into the washing chamber 101. After passing through the washing chamber 101, the rinse liquid flows into the wash tank 108.

[0043] Therefore, the washing tank 108 collects all the liquid sprayed into the washing chamber 101. When the liquid level in the washing tank 108 exceeds a set threshold, the excess liquid flows into the waste water tank 109 as waste water. Figure 3 As shown, hydraulic system 329 includes a wastewater recirculation system that includes a drain valve 337 and two watertight or waterproof seals 338 and 339 to separate wastewater from drain water (which is wastewater that is to be discharged from dishwasher 100 to the drain). Drain pump 334 pumps drain water from the wastewater recirculation system to the drain. When drain pump 334 is off and drain valve 337 is closed, wastewater flows from wash tank 108 into wastewater tank 109, then out of wastewater tank 109 and into the drain at seal 339. When drain pump 334 is on and drain valve 337 is closed, wastewater (being pumped) flows out of wastewater tank 109, through the passageway including drain pump 334, and into the drain at seal 339. When drain valve 337 is open, wastewater flows directly from the wash tank to the drain (without passing through wastewater tank 109 or drain pump 334). The heat exchange coil 363 is placed in the waste water tank 109. The clean water flows through the heat exchange coil 363 to be heated by the waste water before being directed into the wash tank 109 or the boost tank 110, while the waste water is cooled by the clean water before being discharged to the drain.

[0044] Figures 4 to 6Examples of the arrangement of various components in dishwasher 100 are illustrated. Various problems have been observed with existing commercial dishwasher designs. In one example, the dishwasher's components are arranged in a manner that obstructs access to the various internal spaces needed to reach, disassemble, disassemble, and / or reassemble the components, making maintenance and repair difficult and time-consuming. When the dishwasher is used in a small or crowded space, the limited accessibility of internal components can make on-site maintenance and repair impossible. In another example, the dishwasher's electrical control system includes a control box that lacks the robustness required to withstand its environment (e.g., heat, vibration, and rotation) and tangled wiring that makes it difficult to identify the various electrical connections. Such electrical control systems are difficult to maintain and repair and may fail prematurely. In yet another example, the dishwasher's wastewater heat recovery system includes a heat exchange coil placed in the wastewater tank to absorb heat from the wastewater to heat the clean water. The heat exchange coil has a dense piping arrangement, which makes daily cleaning of the wastewater tank difficult and potentially ineffective, creating a food safety risk during the dishwasher's long-term use. The heat exchange coil has a weak connection to the wastewater pipe, which is prone to leaks due to vibration during dishwasher operation.

[0045] The present subject matter, as applied to dishwasher 100, addresses such issues. The components of dishwasher 100 are arranged for easy access during maintenance and repair. For example, key components are positioned for unobstructed access by opening the front cover of dishwasher 100. The electrical control system is designed for reliability and durability during long-term use within dishwasher 100, with wires routed in a simple and organized manner, allowing for easy identification of electrical wiring and connections. The heat recovery system is made removable, allowing for convenient and efficient daily cleaning while ensuring structural stability and operational safety.

[0046] Figure 4 is a perspective view of an embodiment of an arrangement of components in a portion of dishwasher 100, and Figure 5 is a cross-sectional illustration of an embodiment of an arrangement of components in this portion of the dishwasher. Figures 4 and 5 Critical components are shown positioned near the front of the dishwasher 100 for easy access during maintenance or repair. Critical components may include components that require regular maintenance service and / or components that may need repair or replacement during the product life of the dishwasher 100. Figures 4 and 5 Examples of such key components shown include a wash pump 331 , a rinse pump 333 , a drain pump 334 , a main water valve 335 , a waste water tank 109 , and an electrical controller box 460 . Figure 4 It is shown that when the front cover of the dishwasher 100 is open or removed, it provides substantially unobstructed access to these components, among other components, for maintenance, repair, and / or replacement. Such a component arrangement can reduce the need to move the dishwasher to a different location for maintenance or repair.

[0047] The electrical controller box 460 has a balanced length and width to reduce the strength requirements of its rotating parts. All wiring bundles are arranged from the bottom or side wall of the wastewater tank 109, making the wiring clear and easy to identify.

[0048] Figure 6 is an illustration of an embodiment of a wastewater heat recovery module 662 as implemented in a dishwasher 100. The wastewater tank 109 is attached to the main frame of the dishwasher 110 to ensure a stable and reliable connection with the other components and piping of the hydraulic system 329 to withstand vibrations during operation of the dishwasher 100. The wastewater heat recovery module 662 is removably placed in the wastewater tank 109 and includes a wastewater heat exchange coil 663. When the liquid level of the wastewater in the wastewater tank 109 exceeds the maximum liquid level set by the wastewater rod 664, the wastewater flows out of the wash tank 108 and leaves the wastewater tank 109 through the wastewater rod 664. The wastewater heat exchange coil 663 is configured to provide sufficient space between the coil turns for easy cleaning. The removability of the wastewater heat recovery module 662 allows the wastewater tank 109 to be cleaned without the wastewater heat exchange coil 663 becoming an obstruction. Reference is made below Figures 7 to 10 The wastewater heat recovery module 662 is discussed further.

[0049] Figures 7 to 10 An example of wastewater heat recovery that can be implemented in dishwasher 100 is shown. Hood-type dishwashers are widely used in restaurants because they are designed to quickly and cost-effectively clean large quantities of dishware to meet the hygienic requirements of food service. This requires high-speed, continuous operation, applying high-temperature liquid to the dishes for thorough cleaning and sanitization. This operation consumes significant electrical energy, a significant portion of which is converted into heat energy in the wastewater and steam generated during the cleaning cycle.

[0050] Hood-type dishwashers can wash and rinse dishes at high temperatures, generating hot wastewater (e.g., 70°C to 80°C). In one example of a dishwasher, the hot wastewater is discharged directly into the drain, resulting in a waste of heat energy. In another example, a dishwasher includes a built-in wastewater heat recovery system, which includes a heat exchange coil attached to the wastewater path (e.g., a wastewater tank). Because this coil cannot be removed, cleaning the wastewater path to meet hygiene requirements is difficult. Due to the various types of food residue washed off the dishes, thorough cleaning of certain parts of the wastewater path, including the coil, may become impossible. The wastewater tank can be made detachable from the dishwasher for cleaning, but this requires frequent disconnection and reconnection from the drain pipe, increasing the labor required for cleaning and the risk of leaks. In yet another example, the dishwasher is connected to an external wastewater heat recovery system. This requires additional space to operate the dishwasher, and the external wastewater heat recovery system, which is also subject to hygiene requirements, can be difficult to clean.

[0051] Therefore, there is a need for a wastewater heat recovery system that improves the power efficiency of a dishwasher by utilizing the thermal energy of wastewater while being easy to clean. The present subject matter provides a dishwasher, such as dishwasher 100, having a wastewater recycling system that recovers a significant portion (e.g., approximately 35%) of the thermal energy from wastewater while being easy to clean by using a removable heat exchange coil.

[0052] During the cleaning cycle, a certain amount of clean water is added to the hydraulic system of the dishwasher (for example, for rinsing the objects being cleaned with clean water). A roughly equal amount of waste water is discharged to the drain pipe to keep the liquid volume in the hydraulic system constant. The hydraulic system according to the present subject matter includes a waste water recycling structure and a detachable heat exchange coil, which is located in the waste water recycling structure for collecting the waste water to be discharged, and the detachable heat exchange coil is used to use the outflowing waste water to heat the inflowing clean water. The inflowing water needs to be heated to a certain temperature so that the chemical reagents used in the cleaning cycle can effectively exert their intended power and / or be used to disinfect the objects being cleaned. The present hydraulic system reduces the power consumption of the dishwasher by reducing the energy required to heat the inflowing water, and shortens the duration of the cleaning cycle by shortening the time required to heat the inflowing water.

[0053] Advantages of a dishwasher (such as dishwasher 100) provided by the wastewater heat recovery structure in the present hydraulic system include, but are not limited to:

[0054] Wastewater tanks that can be thoroughly cleaned to minimize food safety risks;

[0055] Utilizes the principle of water heat exchange stratification, according to which wastewater with a lower temperature (i.e., less heat energy) is discharged to the drain first;

[0056] No additional space is required to operate the dishwasher;

[0057] Reduce the risk of water leaks associated with routine dishwasher maintenance, including cleaning; and

[0058] ·Simple operation and reduced operating costs.

[0059] Figure 7 is a diagrammatic illustration of an embodiment of portions of a wastewater recirculation system 107 as implemented in a dishwasher 100. Figure 7The illustrated components of the wastewater recirculation system 107 include the wash tank 108, a wash tank drain assembly 765 at the drain of the wash tank 108, the wastewater tank 109, and a wastewater heat exchange coil 663 placed in the wastewater tank 109. The wastewater tank 109 has a drain connection 769. The wash tank drain assembly 765 includes a drain bar 766, a filter 767, and a drain connection 768. The drain bar 766 sets a maximum liquid level of the wash liquid within the wash tank 108 beyond which excess wash liquid passes as wastewater through the drain connection 768, the drain connection 769, and portions of the hydraulic system 329 (as discussed above and further discussed below) to the wastewater tank 109. The drain bar 766 can be raised to drain all of the wash liquid in the wash tank 108. The filter 767 prevents large debris in the wash liquid from exiting the wash tank 108 to cause clogs in the wastewater recirculation portion of the hydraulic system 329. The portions of the wash tank drain assembly 765 that are internal to the wash tank 108 (including the drain bar 766 and the filter 767) can be removed for their cleaning and unobstructed cleaning of the wash tank 108.

[0060] Figure 8 is an illustration of an embodiment of the portions of the hydraulic system 329 of the dishwasher 100 for wastewater recirculation. As Figure 8 The illustrated portions of the hydraulic system 329 include:

[0061] • the wash tank 108 including a wash tank drain 870 (with the wash tank drain assembly 765 placed therein);

[0062] • the wastewater tank 109 including a first wastewater tank drain 871 and a second wastewater tank drain 872 (with the wastewater bar 664 placed therein);

[0063] • the drain pump 334;

[0064] • a first drain seal 338 and a second drain seal 339;

[0065] • a drain pipe 840 through which wastewater is discharged from the dishwasher 100 to a drain pipe (e.g., a drain pipe connected to a building’s sewer);

[0066] • the wastewater heat exchange coil 663 removably placed in the wastewater tank 109 and having an inlet 873 for receiving clean water and an outlet 874 for outputting heated clean water; and

[0067] • the tubes / hoses / pipes of the hydraulic system 329 connected between the components for wastewater recirculation and heat recovery.

[0068] When the drain pump 334 is off and the drain valve 337 is closed:

[0069] Wastewater flows out of the wash tank 108 through the wash tank drain pipe 870;

[0070] Wastewater is diverted at the first drain seal 338 to flow into the wastewater tank 109 through the first wastewater tank drain pipe 871;

[0071] The wastewater flows out of the wastewater tank 109 through the second wastewater drain pipe 872; and

[0072] Wastewater is diverted at the second drain seal 339 to flow into the drain pipe 840 .

[0073] When the drain pump 334 is on and the drain valve 337 is closed:

[0074] The wastewater flows out of the wastewater tank 108 through the first wastewater tank drain pipe 871;

[0075] Wastewater flows (e.g., pumped by drain pump 334) through a path that includes drain pump 334,

[0076] Passing through the first drain seal 338; and

[0077] Wastewater is diverted at the second drain seal 339 to flow into the drain pipe 840 .

[0078] When the drain valve 337 is open, wastewater flows out of the wash tank 108 through the wash tank drain line 870 and the drain valve 337 directly to the drain line 840 (without flowing through the wastewater tank 109 or the drain pump 334). In one example, when the drain rod 766 is in place in the wash tank 108, the operation of the hydraulic system 329, including the wastewater recirculation, is automatically and / or electronically controlled using the user interface 106. A manual process of draining all liquid from the wash tank 108 and the wastewater tank 109 can be performed by removing the drain rod 766 from the wash tank drain assembly 765.

[0079] Figure 9840 . It is an illustration of an embodiment of a wash tank drain assembly 765. A filter 767 can prevent debris (e.g., solid food waste) from leaving the wash tank 108 through the wash tank drain pipe 870. When the wash tank 108 is cleaned, the debris will be removed. In one example, a removable filter is placed above the wash tank 108 to prevent larger debris from entering the wash tank 108, and the filter 767 is used to filter the remaining smaller debris. A drain rod 766 can hold the wash liquid in the wash tank 108 until the level of the wash liquid reaches the maximum level set by the drain rod 766. The drain rod 766 can be lifted to separate from the rest of the wash tank drain assembly 765 to drain the wash liquid directly from the wash tank 108 to the drain pipe 840, for example, when both the wash tank 108 and the waste water tank 109 are emptied for cleaning according to the daily cleaning program established for the dishwasher 100. The first drain seal 338 and the second drain seal separate waste water (before being released into the drain pipe 840) from drain water (waste water ready to be released into the drain pipe 840).

[0080] Figure 10 FIG2 is a diagram illustrating an embodiment of a wastewater heat recovery module 662 positioned within the wastewater tank 109 of the dishwasher 100. The wastewater heat recovery module 662 includes a wastewater heat exchange coil 663 having an inlet 873 for receiving clean water and an outlet 874 for outputting heated clean water. The wastewater and clean water exchange heat within the wastewater tank 109 using the wastewater heat exchange coil 663. Consequently, the clean water is heated before being added to the wash tank 108 and the boost tank 110, while the wastewater is cooled before being discharged to the drain.

[0081] The wastewater heat exchange coil 663 is removably connected to two water hoses of the clean water path of the hydraulic system 329 in a manner that is easily disconnected and reconnected by the user. The dishwasher 100 can be configured to allow easy, unobstructed temporary removal of the wastewater heat exchange coil 663 from the wastewater tank 109. The process of cleaning the wastewater tank 109 and the wastewater heat recovery module 662 (e.g., as part of a daily cleaning routine established for the dishwasher 100) can include:

[0082] Remove the top cover (watertight or waterproof) of the wastewater tank 109;

[0083] Disconnect the wastewater heat exchange coil 663 from the water hose;

[0084] Remove the wastewater heat exchange coil 663 from the wastewater tank 109;

[0085] Clean the wastewater tank 109 and the wastewater heat exchange coil 663;

[0086] Place the wastewater heat exchange coil 663 back into the wastewater tank 109;

[0087] Connect the wastewater heat exchange coil 663 back to the water hose; and

[0088] Place the top cover back on the wastewater tank 109

[0089] The wastewater heat exchange coil 663 has a structure designed for easy cleaning, such as leaving ample space between loops of the coil and the coil having a "non-stick" surface.

[0090] The wastewater heat recovery system for the dishwasher 100 has been tested using a prototype wastewater heat exchange coil 663 constructed using approximately 12 mm diameter tubing, containing approximately 1.3 L of clean water, and providing approximately 0.56 m 2 The volume of wastewater in the wastewater tank is approximately 12 liters. When the temperature of the wastewater entering the wastewater tank is approximately 65°C and the temperature of the wastewater leaving the wastewater tank is approximately 37°C to 40°C, a heat exchange efficiency of approximately 35% is achieved. Tests performed through multiple cleaning cycles with the wastewater heat recovery system operating and bypassed revealed that the overall power consumption of dishwasher 100 was approximately 21%.

[0091] Figures 11 to 15 An example of steam heat recovery that can be implemented in a dishwasher 100 is illustrated. During operation of the dishwasher, hot steam is generated in the washing chamber of the dishwasher. The steam reduction system can heat the clean water while condensing the steam, thereby reducing the amount of steam escaping from the dishwasher and reducing the energy required to heat the clean water.

[0092] In the case of hood-type dishwashers, steam heat exchange coils are used in the condenser to pass cleaning water through steam, thereby condensing the steam while heating the cleaning water. However, the coils can be too long, requiring a large amount of space within the dishwasher while reducing the water pressure in the dishwasher's hydraulic system. This can result in a slow or insufficient water supply for washing and rinsing the cleaned objects. Therefore, there is a need for a steam reduction module that provides heat recovery from steam with high heat exchange efficiency while maintaining stable water pressure in the hydraulic system during the wash and rinse cycles, which is required for proper operation of the dishwasher.

[0093] The present subject matter provides a dishwasher (such as dishwasher 100) having a steam reduction module that draws hot steam into a condenser where it is condensed while cleaning water is heated with high heat exchange efficiency, while maintaining pressure in the dishwasher's hydraulic system without significantly increasing the overall size of the dishwasher. The steam heat exchange coil according to the present subject matter includes multiple short tubes connected in parallel, rather than using a single long tube, to reduce water pressure loss in the coil.

[0094] Figure 11 is a diagram of an embodiment of various parts of a dishwasher 100, illustrating air and steam flow during operation. During each cleaning cycle, hot steam is generated by spraying hot liquid into the washing chamber 101 to spray the objects being washed. The hot steam is then exhausted from the dishwasher 100, allowing it to operate safely and continuously.

[0095] Figure 12 is a diagram of an embodiment of portions of a dishwasher 100 , showing a steam reduction module 1211 as implemented in the dishwasher 100 . Figure 13 is a diagram of an embodiment of portions of a steam reduction module 1211 showing steam flow and clean water flow for steam heat recovery. The steam reduction module 1211 is an example of the steam reduction module 111 and includes a fan 1212 (e.g., a cross flow fan) and a condenser 1213. The fan 1212 is positioned to draw steam from the wash chamber 101 (within the hood 102 when the hood 102 is closed) and blow the remaining steam out of the dishwasher to escape into the environment (e.g., the vent hood 225, if installed). The condenser 1213 includes a steam heat exchange coil for exchanging heat between hot steam and clean water, as described below with reference to Figure 15 Further discussion. Figures 12 to 13 As shown, a condenser 1213 is positioned in the path of the steam flow to cool the steam while heating the clean water inside the steam heat exchange coil.

[0096] like Figures 12 to 13 As shown, the dishwasher 100 includes a rear frame 1180 (e.g., as part of the main frame of the dishwasher). After leaving the washing chamber 101, steam primarily flows through a path in the upper portion of the rear frame 1180 to escape from the top of the rear frame 1180. The steam reduction module 1211 is positioned in this path within the upper portion of the rear frame 1180.

[0097] Figure 14 is an illustration of an embodiment of portions of a steam reduction module that optionally includes an indoor air funnel 1481 and an air inlet 1482. The funnel 1481 is positioned at or near the top of the rear frame 1180. The fan 1212 draws steam from the washing chamber 101 and blows the steam remaining after passing through the condenser 1213 into the funnel 1481 to escape from the dishwasher 100. The air inlet 1482 allows cool air to be drawn into the steam reduction module 1211 by the fan 1212 to further cool the steam and cool the funnel 1481. The optional use of the funnel 1481 and the air inlet 1482 can reduce temperature variations of the remaining steam escaping from the dishwasher 100. Figure 14As shown, when the dishwasher 100 is set for operation, the air inlet 1482 has an opening positioned below the fan 1212 , and the funnel 1481 has an opening positioned above the fan 1212 .

[0098] Figure 15 15 is a diagram illustrating an embodiment of a steam heat exchange coil 1587 of a condenser 1513 as an example of the condenser 1213. The condenser 1213 includes a clean water inlet 1585 for receiving clean water and a clean water outlet 1586 for outputting heated clean water, the steam heat exchange coil 1587 coupled between the clean water inlet 1585 and the clean water outlet 1586, and heat conducting fins 1588 coupled to the steam heat exchange coil 1587. Figure 15 As shown, the steam heat exchange coil 1587 includes multiple individual loops 1587A, 1587B, and 1587C connected in parallel, and each loop is directly connected between the clean water inlet 1585 and the clean water outlet 1586. The use of multiple individual loops does not significantly reduce the pressure in the hydraulic system 329 compared to using a single long coil. Figure 15 As shown, as an example for illustrative rather than limiting purposes, steam heat exchange coil 1587 includes 3 loops: 1587A, 1587B and 1587C. The number of loops and the specific geometric design of each loop can vary according to design goals and constraints, as understood by those skilled in the art. Loops 1587A, 1587B and 1587C each directly receive clean water (without passing through another loop) from clean water inlet 1585, and output heated clean water to clean water outlet 1586 (without passing through another loop). The steam heat exchange coil 1587 comprising each of loops 1587A, 1587B and 1587C transfers heat energy from steam to clean water, thereby heating clean water while condensing steam. Heat conducting fins 1588 (for example, made of aluminum) can absorb heat energy from steam and conduct the absorbed heat to steam heat recovery coil 1587, thereby improving the heat transfer efficiency of steam reduction module 1211.

[0099] The steam reduction module for dishwasher 100 has been used with a prototype condenser 1513 and a device having a capacity of about 5.3m 3 A cross-flow fan with a flow rate of 100 / min was tested. Due to the use of the steam reduction module, the temperature of the cleaning water increased by about 10°C, the amount of steam was reduced by about 90%, and the temperature of the steam was reduced from about 35°C to 55°C (which varied during the cleaning cycle) to about 30°C.

[0100] Any one or any combination of the various embodiments of the present subject matter as discussed in this disclosure can be implemented in a dishwasher, for example, to facilitate access to various components for maintenance and / or repair, to improve the power efficiency of the dishwasher by exchanging heat between clean water and waste water, to improve the power efficiency of the dishwasher by exchanging heat between clean water and steam while reducing steam escape, and / or to facilitate cleaning of the dishwasher to ensure proper operation and compliance with cleaning procedures and / or food safety regulations. Some non-limiting examples of the present subject matter (Examples 1 to 40) are provided below:

[0101] In embodiment 1, a dishwasher is provided, configured to perform cleaning cycles, each of which includes a wash cycle and a rinse cycle for cleaning objects. The dishwasher may include a washing chamber, a wash tank, a wastewater tank, and a wastewater heat exchange coil. The washing chamber may be configured to hold the objects. The wash tank may be configured to hold detergent to be sprayed into the washing chamber during the wash cycle, receive return liquid from the washing chamber to be added to the detergent, and release a portion of the detergent when the detergent level in the wash tank exceeds a threshold level. The wastewater tank may be configured to receive wastewater from the wash tank and release the received wastewater to a drain. The wastewater includes the portion of the detergent released from the wash tank. The wastewater heat exchange coil may be configured to be removably placed in the wastewater tank and transfer heat energy from the wastewater to heat clean water. The wastewater heat exchange coil has a clean water inlet for receiving the clean water and a clean water outlet for outputting the heated clean water.

[0102] In Example 2, the subject matter of Example 1 can optionally be configured to include a hydraulic system comprising the wash tank and the wastewater tank, and configured to receive heated clean water from the wastewater heat exchange coil and transfer a portion of the received heated clean water to the wash tank.

[0103] In Example 3, the subject matter of Example 2 can optionally be configured such that the hydraulic system further includes a rinse tank configured to hold rinse liquid to be sprayed into the washing chamber during the rinse cycle, and the hydraulic system is further configured to transfer another portion of the received heated cleaning water to the rinse tank.

[0104] In Example 4, the subject matter of Example 2 can optionally be configured such that the hydraulic system includes a drain pump, the wastewater tank includes a first wastewater tank drain pipe and a second wastewater tank drain pipe, and the hydraulic system is configured to allow the wastewater to enter the wastewater tank through the first wastewater tank drain pipe and be released to the drain pipe through the second wastewater tank drain pipe when the drain pump is turned off, and to be pumped to the drain pipe through the first wastewater tank drain pipe and the drain pump when the drain pump is turned on.

[0105] In Example 5, the subject matter of Example 2 can optionally be configured such that the wash tank includes a wash tank drain pipe, the portion of the wash liquid is released through the wash tank drain pipe, and the hydraulic system further includes a drain valve, the drain valve being configured to allow the wash liquid to be released from the wash tank to the drain pipe through the wash tank drain pipe and the drain valve when the drain valve is open.

[0106] In Example 6, the subject matter of Example 5 can optionally be configured to further include a wash tank drain assembly, the wash tank drain assembly comprising a filter configured to prevent debris in the wash liquid from entering the wash tank drain pipe; and a detachable drain rod configured to retain the wash liquid within the wash tank and to be lifted when the drain valve is opened to release the wash liquid from the wash tank to the drain pipe through the drain valve.

[0107] In Example 7, the subject matter of Example 5 can optionally be configured such that the hydraulic system further includes a seal configured to separate the waste water from the drain pipe when the drain valve is closed.

[0108] In Example 8, the subject matter of Example 2 can be optionally configured such that the hydraulic system includes a cold clean water hose and a heated clean water hose, and the clean water inlet of the waste water heat exchange coil is configured to be detachably connected to the cold clean water hose to form a watertight connection, and the clean water outlet of the waste water heat exchange coil is configured to be detachably connected to the heated clean water hose to form another watertight connection.

[0109] In Example 9, the subject matter of Example 1 can optionally be configured to further include a cover configured to be detachably attached to the wastewater tank as a watertight or waterproof top cover for the wastewater tank.

[0110] In Example 10, the subject matter of any one or any combination of Examples 1 to 9 can optionally be configured to include a front cover that is openable or removable; and components requiring regular maintenance that are arranged for unobstructed access when the front cover is open or removable.

[0111] In Example 11, the subject matter of Example 10 can optionally be configured such that the component requiring periodic maintenance includes an electrical control box, and further comprising electrical wiring providing a plurality of electrical connections to the electrical control box, the electrical wiring being arranged in a manner allowing visual identification of each of the electrical connections.

[0112] In Example 12, the subject matter of any one or any combination of Examples 1 to 9 can optionally be configured to further include a steam reduction module comprising a fan and a condenser. The fan is configured to draw steam from the washing chamber and blow the remaining steam out of the dishwasher. The condenser is placed in the path of the steam between the washing chamber and the fan, and is configured to condense the steam drawn into the steam reduction module into the remaining steam while heating additional clean water. The condenser includes an additional clean water inlet for receiving the additional clean water; an additional clean water outlet for outputting the heated additional clean water; and a steam heat exchange coil comprising a plurality of loops, each loop being directly connected to the additional clean water inlet to receive a portion of the received additional clean water, and directly connected to the additional clean water outlet to output a portion of the heated additional clean water.

[0113] In Example 13, the subject matter of Example 12 can optionally be configured to further include an indoor air funnel, and such that the fan is positioned to blow the residual steam out of the dishwasher through the indoor air funnel.

[0114] In Example 14, the subject matter of Example 13 can optionally be configured to further include a cold air inlet, which is configured and positioned to allow cold air to be drawn into the steam reduction module by the fan to cool the steam and the indoor air funnel, and such that the cold air inlet has an opening positioned below the fan and the funnel has an opening positioned above the fan.

[0115] In Example 15, the subject matter of Example 12 can optionally be configured such that the condenser includes a plurality of heat-conducting fins connected to the steam heat exchange coil and configured to absorb heat from the steam and transfer the absorbed heat to the steam heat exchange coil.

[0116] In embodiment 16, a dishwasher is provided, the dishwasher being configured to perform cleaning cycles, each cleaning cycle including a wash cycle and a rinse cycle for cleaning objects. The dishwasher may include a washing chamber and a steam reduction module. The washing chamber may be configured to hold the objects and allow them to be washed during the wash cycle and rinsed during the rinse cycle. The steam reduction module may include a crossflow fan and a condenser. The fan may be configured to draw steam from the washing chamber and blow the remaining steam out of the dishwasher. The condenser may be placed in the path of the steam between the washing chamber and the fan and configured to condense the steam drawn into the steam reduction module into remaining steam while heating clean water. The condenser may include a clean water inlet for receiving clean water; a clean water outlet for outputting heated clean water; and a steam heat exchange coil comprising a plurality of loops, each loop being directly connected to the clean water inlet to receive a portion of the received clean water and directly connected to the clean water outlet to output a portion of the heated clean water.

[0117] In Example 17, the subject matter of Example 16 can optionally be configured to further include an indoor air funnel, and such that the fan is positioned to blow the residual steam out of the dishwasher through the indoor air funnel.

[0118] In Example 18, the subject matter of Example 17 can optionally be configured to further include a cold air inlet configured and positioned to allow cold air to be drawn into the vapor reduction module by the fan to cool the vapor and the indoor air funnel. The cold air inlet has an opening positioned below the fan. The indoor air funnel has an opening positioned above the fan.

[0119] In Example 19, the subject matter of Example 16 can optionally be configured such that the condenser includes a plurality of heat-conducting fins connected to the steam heat exchange coil and configured to absorb heat from the steam and transfer the absorbed heat to the steam heat exchange coil.

[0120] In Example 20, the subject matter of any one or any combination of Examples 16 to 19 can optionally be configured such that the fan comprises a cross-flow fan.

[0121] In Example 21, the subject matter of any one or any combination of Examples 16 to 19 can optionally be configured such that the dishwasher is a hood-type dishwasher comprising a main frame including a rear frame having a top portion positioned higher than the washing chamber, and such that the steam reduction module is positioned in the top portion of the rear frame.

[0122] In Example 22, the subject matter of Example 21 can optionally be configured to include a front cover and components requiring periodic maintenance. The front cover is attached to the main frame and is openable or detachably attached to the main frame. The components requiring periodic maintenance are arranged for unobstructed access when the front cover is opened or detached.

[0123] In Example 23, the subject matter of Example 22 can optionally be configured such that the component requiring periodic maintenance includes an electrical control box, and further comprising electrical wiring providing a plurality of electrical connections to the electrical control box, the electrical wiring being arranged in a manner allowing visual identification of each of the electrical connections.

[0124] In Example 24, the subject matter of Example 21 can optionally be configured to include a top structure attached to the main frame and positioned above the washing chamber; components placed on the top structure; and a hood configured to cover the front and lateral sides of the washing chamber during the cleaning cycle and to be raised between the cleaning cycles to expose the washing chamber without moving the top structure.

[0125] In embodiment 25, a method for operating a dishwasher is provided. The dishwasher is configured to perform cleaning cycles, each cleaning cycle including a wash cycle and a rinse cycle for cleaning objects. The method may include: receiving a portion of the washing liquid from a wash tank containing the washing liquid; spraying the received portion of the washing liquid into a washing chamber loaded with the objects during the wash cycle; collecting liquid from the washing chamber and returning the collected liquid to the wash tank to be added to the washing liquid; transferring excess washing liquid from the wash tank to a wastewater tank as wastewater, the excess washing liquid being generated when the level of washing liquid in the wash tank exceeds a threshold level; transferring heat energy from the wastewater to clean water flowing through a wastewater heat exchange coil detachably placed in the wastewater tank to heat the clean water; and transferring the wastewater from the wastewater tank to a drain pipe.

[0126] In Example 26, the subject matter of Example 25 can optionally further include adding a portion of the heated clean water to the wash liquor in the wash tank.

[0127] In Example 27, the subject matter of Example 26 can optionally further include receiving a portion of the rinsing liquid from a rinse tank containing the rinsing liquid; spraying the received portion of the rinsing liquid into the washing chamber loaded with the objects during the rinse cycle; and adding another portion of the heated clean water to the rinsing liquid in the rinse tank.

[0128] In Example 28, the subject matter of Example 25 can optionally further include, when the drain pump is turned off, transferring the excess portion of the washing liquid from the wash tank as wastewater to the wastewater tank through a first wastewater tank drain pipe and transferring the wastewater from the wastewater tank to the drain pipe through a second wastewater tank drain pipe of the wastewater tank; and when the drain pump is turned on, transferring the wastewater from the wastewater tank to the drain pipe through the first wastewater tank drain pipe and the drain pump.

[0129] In Example 29, the subject matter of Example 25 can optionally further include transferring the wash liquid from the wash tank to the drain pipe through the drain valve when the drain valve is open.

[0130] In Example 30, the subject matter of Example 29 can optionally include using a wash tank drain assembly attached to the bottom of the wash tank to set the threshold liquid level; using a filter of the wash tank drain assembly to prevent debris in the wash liquid from entering the waste water tank; using a detachable drain rod of the wash tank drain assembly to retain the wash liquid within the wash tank when the drain valve is closed; and when the drain valve is open, lifting the detachable drain rod to release the wash liquid from the wash tank to the drain pipe through the drain valve.

[0131] In Example 31, the subject matter of any one or any combination of Examples 25 to 30 can optionally further include extracting steam from the washing chamber; condensing the steam while heating additional clean water using a steam heat exchange coil, the steam heat exchange coil comprising a plurality of loops, each loop directly connected to an additional clean water inlet to receive a portion of the additional clean water and directly connected to an additional clean water outlet to output a portion of the heated additional clean water; and blowing the steam remaining after the condensation out of the dishwasher.

[0132] In Example 32, the subject matter of blowing the steam remaining from the condensation out of the dishwasher as found in Example 31 can optionally further include blowing the remaining steam out of the dishwasher through a room air funnel at a top portion of the dishwasher.

[0133] In Example 33, the subject matter of Example 32 can optionally further include drawing air from outside the dishwasher to cool the steam and the room air funnel.

[0134] In embodiment 34, the subject matter of embodiment 31 can optionally further comprise absorbing heat energy from the steam using a plurality of thermally conductive fins connected to the steam heat exchange coil and transferring the absorbed heat energy to the steam heat exchange coil.

[0135] In embodiment 35, a method for operating a dishwasher is provided. The dishwasher is configured to perform cleaning cycles, each cleaning cycle including a wash period and a rinse period for cleaning objects. The method can include holding the objects in a wash chamber; washing the objects during the wash period; rinsing the objects during the rinse period; drawing steam from the wash chamber during each cycle of the cleaning cycle; condensing the steam while heating additional cleaning water using a steam heat exchange coil, the steam heat exchange coil including a plurality of loops, each loop directly connected to an additional cleaning water inlet to receive a portion of the additional cleaning water and directly connected to an additional cleaning water outlet to output a portion of heated additional cleaning water; and blowing the remaining steam after condensation out of the dishwasher.

[0136] In embodiment 36, the subject matter of blowing the remaining steam after condensation out of the dishwasher as found in embodiment 35 can optionally include blowing the remaining steam out of the dishwasher through an indoor air funnel at a top portion of the dishwasher.

[0137] In embodiment 37, the subject matter of embodiment 36 can optionally further comprise drawing air from outside of the dishwasher to cool the steam and the indoor air funnel.

[0138] In embodiment 38, the subject matter of embodiment 37 can optionally further draw the steam from the wash chamber using a fan, blow the remaining steam after condensation out of the dishwasher, and draw the air from outside of the dishwasher.

[0139] In embodiment 39, the subject matter of using the fan as found in embodiment 38 can optionally include using a cross-flow fan.

[0140] In embodiment 40, the subject matter of any one or any combination of embodiments 35-38 can optionally further comprise absorbing heat energy from the steam using a plurality of thermally conductive fins connected to the steam heat exchange coil and transferring the absorbed heat energy to the steam heat exchange coil.

[0141] This application is intended to cover any and all modifications or variations in the subject matter described herein. It is to be understood that the above description is illustrative only and not restrictive. The scope of the application should be determined with reference to the appended claims and the full scope of equivalents to which such claims are entitled.

Claims

1. A dishwasher configured to perform cleaning cycles, each cleaning cycle including a wash cycle and a rinse cycle for cleaning objects, the dishwasher comprising: a washing chamber configured to hold the object; a wash tank configured to hold wash liquid to be sprayed into the wash chamber during the wash cycle, receive return liquid from the wash chamber to be added to the wash liquid, and release a portion of the wash liquid when a level of the wash liquid in the wash tank exceeds a threshold level; a wastewater tank configured to receive wastewater from the wash tank and release the received wastewater to a drain, the wastewater including the portion of the wash liquid released from the wash tank; as well as A wastewater heat exchange coil is configured to be detachably placed in the wastewater tank and transfer heat energy from the wastewater to heat clean water, the wastewater heat exchange coil having a clean water inlet for receiving the clean water and a clean water outlet for outputting the heated clean water.

2. The dishwasher according to claim 1, comprising a hydraulic system including the wash tank and the waste water tank, and configured to receive the heated clean water from the waste water heat exchange coil and transfer a portion of the received heated clean water to the wash tank.

3. The dishwasher of claim 2 , wherein the hydraulic system further comprises a rinse tank configured to contain rinse liquid to be sprayed into the washing chamber during the rinse cycle, and the hydraulic system is further configured to transfer another portion of the received heated cleaning water to the rinse tank.

4. The dishwasher according to claim 2 , wherein the hydraulic system includes a drain pump, the wastewater tank includes a first wastewater tank drain pipe and a second wastewater tank drain pipe, and the hydraulic system is configured to allow the wastewater to enter the wastewater tank through the first wastewater tank drain pipe and be released to the drain pipe through the second wastewater tank drain pipe when the drain pump is turned off, and to be pumped to the drain pipe through the first wastewater tank drain pipe and the drain pump when the drain pump is turned on.

5. The dishwasher of claim 2 , wherein the wash tank includes a wash tank drain pipe through which the portion of the wash liquid is released, and the hydraulic system further includes a drain valve configured to allow the wash liquid to be released from the wash tank to the drain pipe through the wash tank drain pipe and the drain valve when the drain valve is open.

6. The dishwasher according to claim 5, further comprising a washing tank drain assembly, wherein the washing tank drain assembly comprises: a filter configured to prevent debris in the wash liquid from entering the wash tank drain; as well as A detachable drain lever is configured to retain the wash liquid within the wash tank and to be lifted when the drain valve is open to release the wash liquid from the wash tank to the drain pipe through the drain valve. 7 . The dishwasher of claim 5 , wherein the hydraulic system further comprises a seal configured to separate the waste water from the drain pipe when the drain valve is closed.

8. The dishwasher of claim 2 , wherein the hydraulic system includes a cold clean water hose and a heated clean water hose, and the clean water inlet of the waste water heat exchange coil is configured to be detachably connected to the cold clean water hose to form a watertight connection, and the clean water outlet of the waste water heat exchange coil is configured to be detachably connected to the heated clean water hose to form another watertight connection. 9 . The dishwasher of claim 1 , further comprising a cover configured to be detachably attached to the wastewater tank as a watertight or waterproof top cover for the wastewater tank.

10. The dishwasher according to any one of the preceding claims, comprising: a front cover, the front cover being openable or detachable; as well as Components requiring regular maintenance are arranged for unobstructed access when the front cover is open or removed.

11. The dishwasher of claim 10, wherein the component requiring periodic maintenance comprises an electrical control box, and further comprising electrical wiring providing a plurality of electrical connections to the electrical control box, the electrical wiring being arranged in a manner allowing visual identification of each of the electrical connections.

12. The dishwasher according to any one of claims 1 to 9, further comprising a steam reduction module, the steam reduction module comprising: a fan configured to draw steam from the washing chamber and blow remaining steam out of the dishwasher; as well as a condenser placed in a path of the steam between the washing chamber and the fan and configured to condense the steam drawn into the steam reduction module into the residual steam while heating additional cleaning water, the condenser comprising: an additional clean water inlet, the additional clean water inlet being used to receive the additional clean water; an additional clean water outlet for outputting heated additional clean water; and A steam heat exchange coil includes a plurality of loops, each loop being directly connected to the additional clean water inlet to receive a portion of the received additional clean water and directly connected to the additional clean water outlet to output a portion of the heated additional clean water.

13. The dishwasher of claim 12, further comprising a room air funnel, and wherein the fan is positioned to blow the residual steam out of the dishwasher through the room air funnel.

14. The dishwasher of claim 13 , further comprising a cool air inlet configured and positioned to allow cool air to be drawn into the steam reduction module by the fan to cool the steam and the indoor air funnel, wherein the cool air inlet has an opening positioned below the fan and the indoor air funnel has an opening positioned above the fan. 15 . The dishwasher of claim 12 , wherein the condenser comprises a plurality of heat-conducting fins connected to the steam heat exchange coil and configured to absorb heat from the steam and transfer the absorbed heat to the steam heat exchange coil.

16. A dishwasher configured to perform cleaning cycles, each cleaning cycle including a wash cycle and a rinse cycle for cleaning objects, the dishwasher comprising: a wash chamber configured to hold the objects and allow the objects to be washed during the wash cycle and rinsed during the rinse cycle; as well as A steam reduction module, the steam reduction module comprising: a fan configured to draw steam from the washing chamber and blow remaining steam out of the dishwasher; and a condenser placed in a path of the steam between the washing chamber and the fan and configured to condense the steam drawn into the steam reduction module into the residual steam while heating the clean water, the condenser comprising: a clean water inlet, the clean water inlet being used to receive clean water; a clean water outlet for outputting heated clean water; and A steam heat exchange coil includes a plurality of loops, each loop being directly connected to the clean water inlet to receive a portion of the received clean water and directly connected to the clean water outlet to output a portion of the heated clean water.

17. The dishwasher of claim 16, further comprising a room air funnel, and wherein the fan is positioned to blow the residual steam out of the dishwasher through the room air funnel.

18. The dishwasher of claim 17 , further comprising a cool air inlet configured and positioned to allow cool air to be drawn into the steam reduction module by the fan to cool the steam and the indoor air funnel, wherein the cool air inlet has an opening positioned below the fan and the indoor air funnel has an opening positioned above the fan. 19 . The dishwasher of claim 16 , wherein the condenser comprises a plurality of heat-conducting fins connected to the steam heat exchange coil and configured to absorb heat from the steam and transfer the absorbed heat to the steam heat exchange coil.

20. The dishwasher of any one of claims 16 to 19, wherein the fan comprises a cross-flow fan.

21. The dishwasher according to any one of claims 16 to 19, wherein the dishwasher is a hood-type dishwasher comprising a main frame including a rear frame having a top portion positioned higher than the washing chamber, wherein the steam reduction module is positioned in the top portion of the rear frame.

22. The dishwasher according to claim 21, comprising: a front cover attached to the main frame and openable or detachably attached to the main frame; as well as Components requiring regular maintenance are arranged for unobstructed access when the front cover is open or removed.

23. The dishwasher of claim 22, wherein the component requiring periodic maintenance comprises an electrical control box, and further comprising electrical wiring providing a plurality of electrical connections to the electrical control box, the electrical wiring being arranged in a manner allowing visual identification of each of the electrical connections.

24. The dishwasher according to claim 21, comprising: a top structure attached to the main frame and positioned above the washing chamber; a component, said component being placed on said top structure; as well as A hood is configured to cover the front and lateral sides of the wash chamber during the cleaning cycle and to be lifted between cleaning cycles to expose the wash chamber without moving the top structure.

25. A method for operating a dishwasher, the dishwasher being configured to perform cleaning cycles, each cleaning cycle comprising a wash period and a rinse period for cleaning objects, the method comprising: receiving a portion of the wash liquid from a wash tank containing the wash liquid; spraying the received portion of the washing liquid into a washing chamber loaded with the objects during the washing cycle; collecting liquid from the wash chamber and returning the collected liquid to the wash tank to be added to the wash liquor; transferring an excess portion of the wash solution from the wash tank to a wastewater tank as wastewater, the excess portion of the wash solution resulting from a level of the wash solution in the wash tank exceeding a threshold level; transferring heat energy from the wastewater to clean water flowing through a wastewater heat exchange coil removably placed in the wastewater tank to heat the clean water; and The wastewater is transferred from the wastewater tank to a drain.

26. The method of claim 25, further comprising adding a portion of the heated cleaning water to the wash liquor in the wash tank.

27. The method according to claim 26, further comprising: receiving a portion of the rinse fluid from a rinse tank containing the rinse fluid; spraying the received portion of the rinse liquid into the washing chamber loaded with the objects during the rinse cycle; as well as Another portion of the heated clean water is added to the rinse liquid in the rinse tank.

28. The method according to claim 25, comprising: transferring the excess portion of the washing liquid from the washing tank to the wastewater tank as wastewater through a first wastewater tank drain pipe and transferring the wastewater from the wastewater tank to the drain pipe through a second wastewater tank drain pipe of the wastewater tank when the drain pump is turned off; and When the drain pump is turned on, the wastewater is transferred from the wastewater tank to the drain pipe through the first wastewater tank drain pipe and the drain pump.

29. The method of claim 25, further comprising transferring the wash liquid from the wash tank to the drain pipe through the drain valve when the drain valve is open.

30. The method according to claim 29, comprising: setting the threshold level using a wash tank drain assembly attached to a bottom of the wash tank; Using a filter in the wash tank drain assembly to prevent debris in the wash liquid from entering the wastewater tank; using a removable drain rod of the wash tank drain assembly to retain the wash liquid within the wash tank when the drain valve is closed; as well as When the drain valve is open, the detachable drain lever is lifted to release the wash liquid from the wash tank to the drain pipe through the drain valve.

31. The method according to any one of claims 25 to 30, further comprising: extracting steam from the washing chamber; condensing the steam while heating the additional clean water using a steam heat exchange coil, the steam heat exchange coil including a plurality of loops, each loop directly connected to an additional clean water inlet to receive a portion of the additional clean water and directly connected to an additional clean water outlet to output a portion of the heated additional clean water; as well as The steam remaining after the condensation is blown out of the dishwasher.

32. The method of claim 31, wherein blowing the steam remaining from the condensing out of the dishwasher comprises blowing the remaining steam out of the dishwasher through a room air funnel at a top portion of the dishwasher.

33. The method of claim 32, further comprising drawing air from outside the dishwasher to cool the steam and the room air funnel.

34. The method of claim 31 , further comprising absorbing thermal energy from the steam and transferring the absorbed thermal energy to the steam heat exchange coil using a plurality of thermally conductive fins connected to the steam heat exchange coil.

35. A method for operating a dishwasher, the dishwasher being configured to perform cleaning cycles, each cleaning cycle comprising a wash cycle and a rinse cycle for cleaning objects, the method comprising: maintaining the object in a washing chamber; washing the object during the wash cycle; rinsing the objects during the rinse cycle; extracting steam from the wash chamber during each cycle of the cleaning cycle; condensing the steam while heating the additional clean water using a steam heat exchange coil, the steam heat exchange coil including a plurality of loops, each loop directly connected to an additional clean water inlet to receive a portion of the additional clean water and directly connected to an additional clean water outlet to output a portion of the heated additional clean water; as well as The steam remaining after the condensation is blown out of the dishwasher.

36. The method of claim 35, wherein blowing the steam remaining from the condensing out of the dishwasher comprises blowing the remaining steam out of the dishwasher through a room air funnel at a top portion of the dishwasher.

37. The method of claim 36, further comprising drawing air from outside the dishwasher to cool the steam and the room air funnel.

38. The method of claim 37, further comprising sucking the steam from the washing chamber using a fan, blowing the steam remaining from the condensation out of the dishwasher, and sucking the air from outside the dishwasher.

39. The method of claim 38, wherein using the fan comprises using a cross-flow fan.

40. The method of any one of claims 35 to 38, further comprising absorbing thermal energy from the steam and transferring the absorbed thermal energy to the steam heat exchange coil using a plurality of thermally conductive fins connected to the steam heat exchange coil.

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